7560 строки
190 KiB
C
7560 строки
190 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* alloc.c
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*
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* Extent allocs and frees
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/swap.h>
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#include <linux/quotaops.h>
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#define MLOG_MASK_PREFIX ML_DISK_ALLOC
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "aops.h"
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#include "blockcheck.h"
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#include "dlmglue.h"
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#include "extent_map.h"
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#include "inode.h"
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#include "journal.h"
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#include "localalloc.h"
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#include "suballoc.h"
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#include "sysfile.h"
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#include "file.h"
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#include "super.h"
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#include "uptodate.h"
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#include "xattr.h"
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#include "buffer_head_io.h"
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/*
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* Operations for a specific extent tree type.
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*
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* To implement an on-disk btree (extent tree) type in ocfs2, add
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* an ocfs2_extent_tree_operations structure and the matching
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* ocfs2_init_<thingy>_extent_tree() function. That's pretty much it
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* for the allocation portion of the extent tree.
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*/
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struct ocfs2_extent_tree_operations {
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/*
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* last_eb_blk is the block number of the right most leaf extent
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* block. Most on-disk structures containing an extent tree store
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* this value for fast access. The ->eo_set_last_eb_blk() and
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* ->eo_get_last_eb_blk() operations access this value. They are
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* both required.
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*/
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void (*eo_set_last_eb_blk)(struct ocfs2_extent_tree *et,
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u64 blkno);
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u64 (*eo_get_last_eb_blk)(struct ocfs2_extent_tree *et);
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/*
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* The on-disk structure usually keeps track of how many total
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* clusters are stored in this extent tree. This function updates
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* that value. new_clusters is the delta, and must be
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* added to the total. Required.
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*/
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void (*eo_update_clusters)(struct inode *inode,
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struct ocfs2_extent_tree *et,
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u32 new_clusters);
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/*
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* If ->eo_insert_check() exists, it is called before rec is
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* inserted into the extent tree. It is optional.
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*/
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int (*eo_insert_check)(struct inode *inode,
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struct ocfs2_extent_tree *et,
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struct ocfs2_extent_rec *rec);
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int (*eo_sanity_check)(struct inode *inode, struct ocfs2_extent_tree *et);
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/*
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* --------------------------------------------------------------
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* The remaining are internal to ocfs2_extent_tree and don't have
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* accessor functions
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*/
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/*
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* ->eo_fill_root_el() takes et->et_object and sets et->et_root_el.
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* It is required.
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*/
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void (*eo_fill_root_el)(struct ocfs2_extent_tree *et);
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/*
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* ->eo_fill_max_leaf_clusters sets et->et_max_leaf_clusters if
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* it exists. If it does not, et->et_max_leaf_clusters is set
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* to 0 (unlimited). Optional.
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*/
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void (*eo_fill_max_leaf_clusters)(struct inode *inode,
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struct ocfs2_extent_tree *et);
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};
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/*
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* Pre-declare ocfs2_dinode_et_ops so we can use it as a sanity check
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* in the methods.
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*/
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static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et);
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static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et,
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u64 blkno);
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static void ocfs2_dinode_update_clusters(struct inode *inode,
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struct ocfs2_extent_tree *et,
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u32 clusters);
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static int ocfs2_dinode_insert_check(struct inode *inode,
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struct ocfs2_extent_tree *et,
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struct ocfs2_extent_rec *rec);
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static int ocfs2_dinode_sanity_check(struct inode *inode,
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struct ocfs2_extent_tree *et);
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static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et);
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static struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = {
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.eo_set_last_eb_blk = ocfs2_dinode_set_last_eb_blk,
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.eo_get_last_eb_blk = ocfs2_dinode_get_last_eb_blk,
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.eo_update_clusters = ocfs2_dinode_update_clusters,
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.eo_insert_check = ocfs2_dinode_insert_check,
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.eo_sanity_check = ocfs2_dinode_sanity_check,
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.eo_fill_root_el = ocfs2_dinode_fill_root_el,
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};
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static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et,
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u64 blkno)
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{
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struct ocfs2_dinode *di = et->et_object;
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BUG_ON(et->et_ops != &ocfs2_dinode_et_ops);
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di->i_last_eb_blk = cpu_to_le64(blkno);
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}
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static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et)
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{
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struct ocfs2_dinode *di = et->et_object;
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BUG_ON(et->et_ops != &ocfs2_dinode_et_ops);
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return le64_to_cpu(di->i_last_eb_blk);
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}
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static void ocfs2_dinode_update_clusters(struct inode *inode,
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struct ocfs2_extent_tree *et,
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u32 clusters)
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{
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struct ocfs2_dinode *di = et->et_object;
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le32_add_cpu(&di->i_clusters, clusters);
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spin_lock(&OCFS2_I(inode)->ip_lock);
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OCFS2_I(inode)->ip_clusters = le32_to_cpu(di->i_clusters);
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spin_unlock(&OCFS2_I(inode)->ip_lock);
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}
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static int ocfs2_dinode_insert_check(struct inode *inode,
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struct ocfs2_extent_tree *et,
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struct ocfs2_extent_rec *rec)
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{
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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BUG_ON(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL);
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mlog_bug_on_msg(!ocfs2_sparse_alloc(osb) &&
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(OCFS2_I(inode)->ip_clusters !=
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le32_to_cpu(rec->e_cpos)),
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"Device %s, asking for sparse allocation: inode %llu, "
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"cpos %u, clusters %u\n",
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osb->dev_str,
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(unsigned long long)OCFS2_I(inode)->ip_blkno,
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rec->e_cpos,
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OCFS2_I(inode)->ip_clusters);
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return 0;
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}
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static int ocfs2_dinode_sanity_check(struct inode *inode,
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struct ocfs2_extent_tree *et)
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{
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struct ocfs2_dinode *di = et->et_object;
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BUG_ON(et->et_ops != &ocfs2_dinode_et_ops);
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BUG_ON(!OCFS2_IS_VALID_DINODE(di));
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return 0;
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}
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static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et)
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{
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struct ocfs2_dinode *di = et->et_object;
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et->et_root_el = &di->id2.i_list;
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}
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static void ocfs2_xattr_value_fill_root_el(struct ocfs2_extent_tree *et)
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{
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struct ocfs2_xattr_value_buf *vb = et->et_object;
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et->et_root_el = &vb->vb_xv->xr_list;
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}
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static void ocfs2_xattr_value_set_last_eb_blk(struct ocfs2_extent_tree *et,
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u64 blkno)
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{
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struct ocfs2_xattr_value_buf *vb = et->et_object;
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vb->vb_xv->xr_last_eb_blk = cpu_to_le64(blkno);
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}
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static u64 ocfs2_xattr_value_get_last_eb_blk(struct ocfs2_extent_tree *et)
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{
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struct ocfs2_xattr_value_buf *vb = et->et_object;
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return le64_to_cpu(vb->vb_xv->xr_last_eb_blk);
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}
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static void ocfs2_xattr_value_update_clusters(struct inode *inode,
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struct ocfs2_extent_tree *et,
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u32 clusters)
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{
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struct ocfs2_xattr_value_buf *vb = et->et_object;
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le32_add_cpu(&vb->vb_xv->xr_clusters, clusters);
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}
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static struct ocfs2_extent_tree_operations ocfs2_xattr_value_et_ops = {
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.eo_set_last_eb_blk = ocfs2_xattr_value_set_last_eb_blk,
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.eo_get_last_eb_blk = ocfs2_xattr_value_get_last_eb_blk,
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.eo_update_clusters = ocfs2_xattr_value_update_clusters,
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.eo_fill_root_el = ocfs2_xattr_value_fill_root_el,
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};
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static void ocfs2_xattr_tree_fill_root_el(struct ocfs2_extent_tree *et)
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{
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struct ocfs2_xattr_block *xb = et->et_object;
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et->et_root_el = &xb->xb_attrs.xb_root.xt_list;
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}
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static void ocfs2_xattr_tree_fill_max_leaf_clusters(struct inode *inode,
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struct ocfs2_extent_tree *et)
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{
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et->et_max_leaf_clusters =
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ocfs2_clusters_for_bytes(inode->i_sb,
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OCFS2_MAX_XATTR_TREE_LEAF_SIZE);
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}
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static void ocfs2_xattr_tree_set_last_eb_blk(struct ocfs2_extent_tree *et,
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u64 blkno)
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{
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struct ocfs2_xattr_block *xb = et->et_object;
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struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
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xt->xt_last_eb_blk = cpu_to_le64(blkno);
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}
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static u64 ocfs2_xattr_tree_get_last_eb_blk(struct ocfs2_extent_tree *et)
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{
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struct ocfs2_xattr_block *xb = et->et_object;
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struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
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return le64_to_cpu(xt->xt_last_eb_blk);
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}
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static void ocfs2_xattr_tree_update_clusters(struct inode *inode,
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struct ocfs2_extent_tree *et,
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u32 clusters)
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{
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struct ocfs2_xattr_block *xb = et->et_object;
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le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, clusters);
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}
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static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
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.eo_set_last_eb_blk = ocfs2_xattr_tree_set_last_eb_blk,
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.eo_get_last_eb_blk = ocfs2_xattr_tree_get_last_eb_blk,
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.eo_update_clusters = ocfs2_xattr_tree_update_clusters,
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.eo_fill_root_el = ocfs2_xattr_tree_fill_root_el,
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.eo_fill_max_leaf_clusters = ocfs2_xattr_tree_fill_max_leaf_clusters,
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};
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static void ocfs2_dx_root_set_last_eb_blk(struct ocfs2_extent_tree *et,
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u64 blkno)
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{
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struct ocfs2_dx_root_block *dx_root = et->et_object;
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dx_root->dr_last_eb_blk = cpu_to_le64(blkno);
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}
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static u64 ocfs2_dx_root_get_last_eb_blk(struct ocfs2_extent_tree *et)
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{
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struct ocfs2_dx_root_block *dx_root = et->et_object;
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return le64_to_cpu(dx_root->dr_last_eb_blk);
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}
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static void ocfs2_dx_root_update_clusters(struct inode *inode,
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struct ocfs2_extent_tree *et,
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u32 clusters)
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{
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struct ocfs2_dx_root_block *dx_root = et->et_object;
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le32_add_cpu(&dx_root->dr_clusters, clusters);
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}
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static int ocfs2_dx_root_sanity_check(struct inode *inode,
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struct ocfs2_extent_tree *et)
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{
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struct ocfs2_dx_root_block *dx_root = et->et_object;
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BUG_ON(!OCFS2_IS_VALID_DX_ROOT(dx_root));
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return 0;
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}
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static void ocfs2_dx_root_fill_root_el(struct ocfs2_extent_tree *et)
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{
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struct ocfs2_dx_root_block *dx_root = et->et_object;
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et->et_root_el = &dx_root->dr_list;
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}
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static struct ocfs2_extent_tree_operations ocfs2_dx_root_et_ops = {
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.eo_set_last_eb_blk = ocfs2_dx_root_set_last_eb_blk,
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.eo_get_last_eb_blk = ocfs2_dx_root_get_last_eb_blk,
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.eo_update_clusters = ocfs2_dx_root_update_clusters,
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.eo_sanity_check = ocfs2_dx_root_sanity_check,
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.eo_fill_root_el = ocfs2_dx_root_fill_root_el,
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};
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static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et,
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struct inode *inode,
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struct buffer_head *bh,
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ocfs2_journal_access_func access,
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void *obj,
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struct ocfs2_extent_tree_operations *ops)
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{
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et->et_ops = ops;
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et->et_root_bh = bh;
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et->et_root_journal_access = access;
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if (!obj)
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obj = (void *)bh->b_data;
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et->et_object = obj;
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et->et_ops->eo_fill_root_el(et);
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if (!et->et_ops->eo_fill_max_leaf_clusters)
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et->et_max_leaf_clusters = 0;
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else
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et->et_ops->eo_fill_max_leaf_clusters(inode, et);
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}
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void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
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struct inode *inode,
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struct buffer_head *bh)
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{
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__ocfs2_init_extent_tree(et, inode, bh, ocfs2_journal_access_di,
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NULL, &ocfs2_dinode_et_ops);
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}
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void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
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struct inode *inode,
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struct buffer_head *bh)
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{
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__ocfs2_init_extent_tree(et, inode, bh, ocfs2_journal_access_xb,
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NULL, &ocfs2_xattr_tree_et_ops);
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}
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void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
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struct inode *inode,
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struct ocfs2_xattr_value_buf *vb)
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{
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__ocfs2_init_extent_tree(et, inode, vb->vb_bh, vb->vb_access, vb,
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&ocfs2_xattr_value_et_ops);
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}
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void ocfs2_init_dx_root_extent_tree(struct ocfs2_extent_tree *et,
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struct inode *inode,
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struct buffer_head *bh)
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{
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__ocfs2_init_extent_tree(et, inode, bh, ocfs2_journal_access_dr,
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NULL, &ocfs2_dx_root_et_ops);
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}
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static inline void ocfs2_et_set_last_eb_blk(struct ocfs2_extent_tree *et,
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u64 new_last_eb_blk)
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{
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et->et_ops->eo_set_last_eb_blk(et, new_last_eb_blk);
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}
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static inline u64 ocfs2_et_get_last_eb_blk(struct ocfs2_extent_tree *et)
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{
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return et->et_ops->eo_get_last_eb_blk(et);
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}
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static inline void ocfs2_et_update_clusters(struct inode *inode,
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struct ocfs2_extent_tree *et,
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u32 clusters)
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{
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et->et_ops->eo_update_clusters(inode, et, clusters);
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}
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static inline int ocfs2_et_root_journal_access(handle_t *handle,
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struct inode *inode,
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struct ocfs2_extent_tree *et,
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int type)
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{
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return et->et_root_journal_access(handle, inode, et->et_root_bh,
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type);
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}
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static inline int ocfs2_et_insert_check(struct inode *inode,
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struct ocfs2_extent_tree *et,
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struct ocfs2_extent_rec *rec)
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{
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int ret = 0;
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if (et->et_ops->eo_insert_check)
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ret = et->et_ops->eo_insert_check(inode, et, rec);
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return ret;
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}
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static inline int ocfs2_et_sanity_check(struct inode *inode,
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struct ocfs2_extent_tree *et)
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{
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int ret = 0;
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if (et->et_ops->eo_sanity_check)
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ret = et->et_ops->eo_sanity_check(inode, et);
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return ret;
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}
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static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc);
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static int ocfs2_cache_extent_block_free(struct ocfs2_cached_dealloc_ctxt *ctxt,
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struct ocfs2_extent_block *eb);
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/*
|
|
* Structures which describe a path through a btree, and functions to
|
|
* manipulate them.
|
|
*
|
|
* The idea here is to be as generic as possible with the tree
|
|
* manipulation code.
|
|
*/
|
|
struct ocfs2_path_item {
|
|
struct buffer_head *bh;
|
|
struct ocfs2_extent_list *el;
|
|
};
|
|
|
|
#define OCFS2_MAX_PATH_DEPTH 5
|
|
|
|
struct ocfs2_path {
|
|
int p_tree_depth;
|
|
ocfs2_journal_access_func p_root_access;
|
|
struct ocfs2_path_item p_node[OCFS2_MAX_PATH_DEPTH];
|
|
};
|
|
|
|
#define path_root_bh(_path) ((_path)->p_node[0].bh)
|
|
#define path_root_el(_path) ((_path)->p_node[0].el)
|
|
#define path_root_access(_path)((_path)->p_root_access)
|
|
#define path_leaf_bh(_path) ((_path)->p_node[(_path)->p_tree_depth].bh)
|
|
#define path_leaf_el(_path) ((_path)->p_node[(_path)->p_tree_depth].el)
|
|
#define path_num_items(_path) ((_path)->p_tree_depth + 1)
|
|
|
|
static int ocfs2_find_path(struct inode *inode, struct ocfs2_path *path,
|
|
u32 cpos);
|
|
static void ocfs2_adjust_rightmost_records(struct inode *inode,
|
|
handle_t *handle,
|
|
struct ocfs2_path *path,
|
|
struct ocfs2_extent_rec *insert_rec);
|
|
/*
|
|
* Reset the actual path elements so that we can re-use the structure
|
|
* to build another path. Generally, this involves freeing the buffer
|
|
* heads.
|
|
*/
|
|
static void ocfs2_reinit_path(struct ocfs2_path *path, int keep_root)
|
|
{
|
|
int i, start = 0, depth = 0;
|
|
struct ocfs2_path_item *node;
|
|
|
|
if (keep_root)
|
|
start = 1;
|
|
|
|
for(i = start; i < path_num_items(path); i++) {
|
|
node = &path->p_node[i];
|
|
|
|
brelse(node->bh);
|
|
node->bh = NULL;
|
|
node->el = NULL;
|
|
}
|
|
|
|
/*
|
|
* Tree depth may change during truncate, or insert. If we're
|
|
* keeping the root extent list, then make sure that our path
|
|
* structure reflects the proper depth.
|
|
*/
|
|
if (keep_root)
|
|
depth = le16_to_cpu(path_root_el(path)->l_tree_depth);
|
|
else
|
|
path_root_access(path) = NULL;
|
|
|
|
path->p_tree_depth = depth;
|
|
}
|
|
|
|
static void ocfs2_free_path(struct ocfs2_path *path)
|
|
{
|
|
if (path) {
|
|
ocfs2_reinit_path(path, 0);
|
|
kfree(path);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* All the elements of src into dest. After this call, src could be freed
|
|
* without affecting dest.
|
|
*
|
|
* Both paths should have the same root. Any non-root elements of dest
|
|
* will be freed.
|
|
*/
|
|
static void ocfs2_cp_path(struct ocfs2_path *dest, struct ocfs2_path *src)
|
|
{
|
|
int i;
|
|
|
|
BUG_ON(path_root_bh(dest) != path_root_bh(src));
|
|
BUG_ON(path_root_el(dest) != path_root_el(src));
|
|
BUG_ON(path_root_access(dest) != path_root_access(src));
|
|
|
|
ocfs2_reinit_path(dest, 1);
|
|
|
|
for(i = 1; i < OCFS2_MAX_PATH_DEPTH; i++) {
|
|
dest->p_node[i].bh = src->p_node[i].bh;
|
|
dest->p_node[i].el = src->p_node[i].el;
|
|
|
|
if (dest->p_node[i].bh)
|
|
get_bh(dest->p_node[i].bh);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make the *dest path the same as src and re-initialize src path to
|
|
* have a root only.
|
|
*/
|
|
static void ocfs2_mv_path(struct ocfs2_path *dest, struct ocfs2_path *src)
|
|
{
|
|
int i;
|
|
|
|
BUG_ON(path_root_bh(dest) != path_root_bh(src));
|
|
BUG_ON(path_root_access(dest) != path_root_access(src));
|
|
|
|
for(i = 1; i < OCFS2_MAX_PATH_DEPTH; i++) {
|
|
brelse(dest->p_node[i].bh);
|
|
|
|
dest->p_node[i].bh = src->p_node[i].bh;
|
|
dest->p_node[i].el = src->p_node[i].el;
|
|
|
|
src->p_node[i].bh = NULL;
|
|
src->p_node[i].el = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Insert an extent block at given index.
|
|
*
|
|
* This will not take an additional reference on eb_bh.
|
|
*/
|
|
static inline void ocfs2_path_insert_eb(struct ocfs2_path *path, int index,
|
|
struct buffer_head *eb_bh)
|
|
{
|
|
struct ocfs2_extent_block *eb = (struct ocfs2_extent_block *)eb_bh->b_data;
|
|
|
|
/*
|
|
* Right now, no root bh is an extent block, so this helps
|
|
* catch code errors with dinode trees. The assertion can be
|
|
* safely removed if we ever need to insert extent block
|
|
* structures at the root.
|
|
*/
|
|
BUG_ON(index == 0);
|
|
|
|
path->p_node[index].bh = eb_bh;
|
|
path->p_node[index].el = &eb->h_list;
|
|
}
|
|
|
|
static struct ocfs2_path *ocfs2_new_path(struct buffer_head *root_bh,
|
|
struct ocfs2_extent_list *root_el,
|
|
ocfs2_journal_access_func access)
|
|
{
|
|
struct ocfs2_path *path;
|
|
|
|
BUG_ON(le16_to_cpu(root_el->l_tree_depth) >= OCFS2_MAX_PATH_DEPTH);
|
|
|
|
path = kzalloc(sizeof(*path), GFP_NOFS);
|
|
if (path) {
|
|
path->p_tree_depth = le16_to_cpu(root_el->l_tree_depth);
|
|
get_bh(root_bh);
|
|
path_root_bh(path) = root_bh;
|
|
path_root_el(path) = root_el;
|
|
path_root_access(path) = access;
|
|
}
|
|
|
|
return path;
|
|
}
|
|
|
|
static struct ocfs2_path *ocfs2_new_path_from_path(struct ocfs2_path *path)
|
|
{
|
|
return ocfs2_new_path(path_root_bh(path), path_root_el(path),
|
|
path_root_access(path));
|
|
}
|
|
|
|
static struct ocfs2_path *ocfs2_new_path_from_et(struct ocfs2_extent_tree *et)
|
|
{
|
|
return ocfs2_new_path(et->et_root_bh, et->et_root_el,
|
|
et->et_root_journal_access);
|
|
}
|
|
|
|
/*
|
|
* Journal the buffer at depth idx. All idx>0 are extent_blocks,
|
|
* otherwise it's the root_access function.
|
|
*
|
|
* I don't like the way this function's name looks next to
|
|
* ocfs2_journal_access_path(), but I don't have a better one.
|
|
*/
|
|
static int ocfs2_path_bh_journal_access(handle_t *handle,
|
|
struct inode *inode,
|
|
struct ocfs2_path *path,
|
|
int idx)
|
|
{
|
|
ocfs2_journal_access_func access = path_root_access(path);
|
|
|
|
if (!access)
|
|
access = ocfs2_journal_access;
|
|
|
|
if (idx)
|
|
access = ocfs2_journal_access_eb;
|
|
|
|
return access(handle, inode, path->p_node[idx].bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
}
|
|
|
|
/*
|
|
* Convenience function to journal all components in a path.
|
|
*/
|
|
static int ocfs2_journal_access_path(struct inode *inode, handle_t *handle,
|
|
struct ocfs2_path *path)
|
|
{
|
|
int i, ret = 0;
|
|
|
|
if (!path)
|
|
goto out;
|
|
|
|
for(i = 0; i < path_num_items(path); i++) {
|
|
ret = ocfs2_path_bh_journal_access(handle, inode, path, i);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Return the index of the extent record which contains cluster #v_cluster.
|
|
* -1 is returned if it was not found.
|
|
*
|
|
* Should work fine on interior and exterior nodes.
|
|
*/
|
|
int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster)
|
|
{
|
|
int ret = -1;
|
|
int i;
|
|
struct ocfs2_extent_rec *rec;
|
|
u32 rec_end, rec_start, clusters;
|
|
|
|
for(i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
|
|
rec = &el->l_recs[i];
|
|
|
|
rec_start = le32_to_cpu(rec->e_cpos);
|
|
clusters = ocfs2_rec_clusters(el, rec);
|
|
|
|
rec_end = rec_start + clusters;
|
|
|
|
if (v_cluster >= rec_start && v_cluster < rec_end) {
|
|
ret = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
enum ocfs2_contig_type {
|
|
CONTIG_NONE = 0,
|
|
CONTIG_LEFT,
|
|
CONTIG_RIGHT,
|
|
CONTIG_LEFTRIGHT,
|
|
};
|
|
|
|
|
|
/*
|
|
* NOTE: ocfs2_block_extent_contig(), ocfs2_extents_adjacent() and
|
|
* ocfs2_extent_contig only work properly against leaf nodes!
|
|
*/
|
|
static int ocfs2_block_extent_contig(struct super_block *sb,
|
|
struct ocfs2_extent_rec *ext,
|
|
u64 blkno)
|
|
{
|
|
u64 blk_end = le64_to_cpu(ext->e_blkno);
|
|
|
|
blk_end += ocfs2_clusters_to_blocks(sb,
|
|
le16_to_cpu(ext->e_leaf_clusters));
|
|
|
|
return blkno == blk_end;
|
|
}
|
|
|
|
static int ocfs2_extents_adjacent(struct ocfs2_extent_rec *left,
|
|
struct ocfs2_extent_rec *right)
|
|
{
|
|
u32 left_range;
|
|
|
|
left_range = le32_to_cpu(left->e_cpos) +
|
|
le16_to_cpu(left->e_leaf_clusters);
|
|
|
|
return (left_range == le32_to_cpu(right->e_cpos));
|
|
}
|
|
|
|
static enum ocfs2_contig_type
|
|
ocfs2_extent_contig(struct inode *inode,
|
|
struct ocfs2_extent_rec *ext,
|
|
struct ocfs2_extent_rec *insert_rec)
|
|
{
|
|
u64 blkno = le64_to_cpu(insert_rec->e_blkno);
|
|
|
|
/*
|
|
* Refuse to coalesce extent records with different flag
|
|
* fields - we don't want to mix unwritten extents with user
|
|
* data.
|
|
*/
|
|
if (ext->e_flags != insert_rec->e_flags)
|
|
return CONTIG_NONE;
|
|
|
|
if (ocfs2_extents_adjacent(ext, insert_rec) &&
|
|
ocfs2_block_extent_contig(inode->i_sb, ext, blkno))
|
|
return CONTIG_RIGHT;
|
|
|
|
blkno = le64_to_cpu(ext->e_blkno);
|
|
if (ocfs2_extents_adjacent(insert_rec, ext) &&
|
|
ocfs2_block_extent_contig(inode->i_sb, insert_rec, blkno))
|
|
return CONTIG_LEFT;
|
|
|
|
return CONTIG_NONE;
|
|
}
|
|
|
|
/*
|
|
* NOTE: We can have pretty much any combination of contiguousness and
|
|
* appending.
|
|
*
|
|
* The usefulness of APPEND_TAIL is more in that it lets us know that
|
|
* we'll have to update the path to that leaf.
|
|
*/
|
|
enum ocfs2_append_type {
|
|
APPEND_NONE = 0,
|
|
APPEND_TAIL,
|
|
};
|
|
|
|
enum ocfs2_split_type {
|
|
SPLIT_NONE = 0,
|
|
SPLIT_LEFT,
|
|
SPLIT_RIGHT,
|
|
};
|
|
|
|
struct ocfs2_insert_type {
|
|
enum ocfs2_split_type ins_split;
|
|
enum ocfs2_append_type ins_appending;
|
|
enum ocfs2_contig_type ins_contig;
|
|
int ins_contig_index;
|
|
int ins_tree_depth;
|
|
};
|
|
|
|
struct ocfs2_merge_ctxt {
|
|
enum ocfs2_contig_type c_contig_type;
|
|
int c_has_empty_extent;
|
|
int c_split_covers_rec;
|
|
};
|
|
|
|
static int ocfs2_validate_extent_block(struct super_block *sb,
|
|
struct buffer_head *bh)
|
|
{
|
|
int rc;
|
|
struct ocfs2_extent_block *eb =
|
|
(struct ocfs2_extent_block *)bh->b_data;
|
|
|
|
mlog(0, "Validating extent block %llu\n",
|
|
(unsigned long long)bh->b_blocknr);
|
|
|
|
BUG_ON(!buffer_uptodate(bh));
|
|
|
|
/*
|
|
* If the ecc fails, we return the error but otherwise
|
|
* leave the filesystem running. We know any error is
|
|
* local to this block.
|
|
*/
|
|
rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &eb->h_check);
|
|
if (rc) {
|
|
mlog(ML_ERROR, "Checksum failed for extent block %llu\n",
|
|
(unsigned long long)bh->b_blocknr);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Errors after here are fatal.
|
|
*/
|
|
|
|
if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
|
|
ocfs2_error(sb,
|
|
"Extent block #%llu has bad signature %.*s",
|
|
(unsigned long long)bh->b_blocknr, 7,
|
|
eb->h_signature);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (le64_to_cpu(eb->h_blkno) != bh->b_blocknr) {
|
|
ocfs2_error(sb,
|
|
"Extent block #%llu has an invalid h_blkno "
|
|
"of %llu",
|
|
(unsigned long long)bh->b_blocknr,
|
|
(unsigned long long)le64_to_cpu(eb->h_blkno));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (le32_to_cpu(eb->h_fs_generation) != OCFS2_SB(sb)->fs_generation) {
|
|
ocfs2_error(sb,
|
|
"Extent block #%llu has an invalid "
|
|
"h_fs_generation of #%u",
|
|
(unsigned long long)bh->b_blocknr,
|
|
le32_to_cpu(eb->h_fs_generation));
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ocfs2_read_extent_block(struct inode *inode, u64 eb_blkno,
|
|
struct buffer_head **bh)
|
|
{
|
|
int rc;
|
|
struct buffer_head *tmp = *bh;
|
|
|
|
rc = ocfs2_read_block(inode, eb_blkno, &tmp,
|
|
ocfs2_validate_extent_block);
|
|
|
|
/* If ocfs2_read_block() got us a new bh, pass it up. */
|
|
if (!rc && !*bh)
|
|
*bh = tmp;
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* How many free extents have we got before we need more meta data?
|
|
*/
|
|
int ocfs2_num_free_extents(struct ocfs2_super *osb,
|
|
struct inode *inode,
|
|
struct ocfs2_extent_tree *et)
|
|
{
|
|
int retval;
|
|
struct ocfs2_extent_list *el = NULL;
|
|
struct ocfs2_extent_block *eb;
|
|
struct buffer_head *eb_bh = NULL;
|
|
u64 last_eb_blk = 0;
|
|
|
|
mlog_entry_void();
|
|
|
|
el = et->et_root_el;
|
|
last_eb_blk = ocfs2_et_get_last_eb_blk(et);
|
|
|
|
if (last_eb_blk) {
|
|
retval = ocfs2_read_extent_block(inode, last_eb_blk, &eb_bh);
|
|
if (retval < 0) {
|
|
mlog_errno(retval);
|
|
goto bail;
|
|
}
|
|
eb = (struct ocfs2_extent_block *) eb_bh->b_data;
|
|
el = &eb->h_list;
|
|
}
|
|
|
|
BUG_ON(el->l_tree_depth != 0);
|
|
|
|
retval = le16_to_cpu(el->l_count) - le16_to_cpu(el->l_next_free_rec);
|
|
bail:
|
|
brelse(eb_bh);
|
|
|
|
mlog_exit(retval);
|
|
return retval;
|
|
}
|
|
|
|
/* expects array to already be allocated
|
|
*
|
|
* sets h_signature, h_blkno, h_suballoc_bit, h_suballoc_slot, and
|
|
* l_count for you
|
|
*/
|
|
static int ocfs2_create_new_meta_bhs(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct inode *inode,
|
|
int wanted,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct buffer_head *bhs[])
|
|
{
|
|
int count, status, i;
|
|
u16 suballoc_bit_start;
|
|
u32 num_got;
|
|
u64 first_blkno;
|
|
struct ocfs2_extent_block *eb;
|
|
|
|
mlog_entry_void();
|
|
|
|
count = 0;
|
|
while (count < wanted) {
|
|
status = ocfs2_claim_metadata(osb,
|
|
handle,
|
|
meta_ac,
|
|
wanted - count,
|
|
&suballoc_bit_start,
|
|
&num_got,
|
|
&first_blkno);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
for(i = count; i < (num_got + count); i++) {
|
|
bhs[i] = sb_getblk(osb->sb, first_blkno);
|
|
if (bhs[i] == NULL) {
|
|
status = -EIO;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
|
|
|
|
status = ocfs2_journal_access_eb(handle, inode, bhs[i],
|
|
OCFS2_JOURNAL_ACCESS_CREATE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
memset(bhs[i]->b_data, 0, osb->sb->s_blocksize);
|
|
eb = (struct ocfs2_extent_block *) bhs[i]->b_data;
|
|
/* Ok, setup the minimal stuff here. */
|
|
strcpy(eb->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE);
|
|
eb->h_blkno = cpu_to_le64(first_blkno);
|
|
eb->h_fs_generation = cpu_to_le32(osb->fs_generation);
|
|
eb->h_suballoc_slot = cpu_to_le16(osb->slot_num);
|
|
eb->h_suballoc_bit = cpu_to_le16(suballoc_bit_start);
|
|
eb->h_list.l_count =
|
|
cpu_to_le16(ocfs2_extent_recs_per_eb(osb->sb));
|
|
|
|
suballoc_bit_start++;
|
|
first_blkno++;
|
|
|
|
/* We'll also be dirtied by the caller, so
|
|
* this isn't absolutely necessary. */
|
|
status = ocfs2_journal_dirty(handle, bhs[i]);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
count += num_got;
|
|
}
|
|
|
|
status = 0;
|
|
bail:
|
|
if (status < 0) {
|
|
for(i = 0; i < wanted; i++) {
|
|
brelse(bhs[i]);
|
|
bhs[i] = NULL;
|
|
}
|
|
}
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Helper function for ocfs2_add_branch() and ocfs2_shift_tree_depth().
|
|
*
|
|
* Returns the sum of the rightmost extent rec logical offset and
|
|
* cluster count.
|
|
*
|
|
* ocfs2_add_branch() uses this to determine what logical cluster
|
|
* value should be populated into the leftmost new branch records.
|
|
*
|
|
* ocfs2_shift_tree_depth() uses this to determine the # clusters
|
|
* value for the new topmost tree record.
|
|
*/
|
|
static inline u32 ocfs2_sum_rightmost_rec(struct ocfs2_extent_list *el)
|
|
{
|
|
int i;
|
|
|
|
i = le16_to_cpu(el->l_next_free_rec) - 1;
|
|
|
|
return le32_to_cpu(el->l_recs[i].e_cpos) +
|
|
ocfs2_rec_clusters(el, &el->l_recs[i]);
|
|
}
|
|
|
|
/*
|
|
* Change range of the branches in the right most path according to the leaf
|
|
* extent block's rightmost record.
|
|
*/
|
|
static int ocfs2_adjust_rightmost_branch(handle_t *handle,
|
|
struct inode *inode,
|
|
struct ocfs2_extent_tree *et)
|
|
{
|
|
int status;
|
|
struct ocfs2_path *path = NULL;
|
|
struct ocfs2_extent_list *el;
|
|
struct ocfs2_extent_rec *rec;
|
|
|
|
path = ocfs2_new_path_from_et(et);
|
|
if (!path) {
|
|
status = -ENOMEM;
|
|
return status;
|
|
}
|
|
|
|
status = ocfs2_find_path(inode, path, UINT_MAX);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto out;
|
|
}
|
|
|
|
status = ocfs2_extend_trans(handle, path_num_items(path) +
|
|
handle->h_buffer_credits);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto out;
|
|
}
|
|
|
|
status = ocfs2_journal_access_path(inode, handle, path);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto out;
|
|
}
|
|
|
|
el = path_leaf_el(path);
|
|
rec = &el->l_recs[le32_to_cpu(el->l_next_free_rec) - 1];
|
|
|
|
ocfs2_adjust_rightmost_records(inode, handle, path, rec);
|
|
|
|
out:
|
|
ocfs2_free_path(path);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Add an entire tree branch to our inode. eb_bh is the extent block
|
|
* to start at, if we don't want to start the branch at the dinode
|
|
* structure.
|
|
*
|
|
* last_eb_bh is required as we have to update it's next_leaf pointer
|
|
* for the new last extent block.
|
|
*
|
|
* the new branch will be 'empty' in the sense that every block will
|
|
* contain a single record with cluster count == 0.
|
|
*/
|
|
static int ocfs2_add_branch(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
struct buffer_head *eb_bh,
|
|
struct buffer_head **last_eb_bh,
|
|
struct ocfs2_alloc_context *meta_ac)
|
|
{
|
|
int status, new_blocks, i;
|
|
u64 next_blkno, new_last_eb_blk;
|
|
struct buffer_head *bh;
|
|
struct buffer_head **new_eb_bhs = NULL;
|
|
struct ocfs2_extent_block *eb;
|
|
struct ocfs2_extent_list *eb_el;
|
|
struct ocfs2_extent_list *el;
|
|
u32 new_cpos, root_end;
|
|
|
|
mlog_entry_void();
|
|
|
|
BUG_ON(!last_eb_bh || !*last_eb_bh);
|
|
|
|
if (eb_bh) {
|
|
eb = (struct ocfs2_extent_block *) eb_bh->b_data;
|
|
el = &eb->h_list;
|
|
} else
|
|
el = et->et_root_el;
|
|
|
|
/* we never add a branch to a leaf. */
|
|
BUG_ON(!el->l_tree_depth);
|
|
|
|
new_blocks = le16_to_cpu(el->l_tree_depth);
|
|
|
|
eb = (struct ocfs2_extent_block *)(*last_eb_bh)->b_data;
|
|
new_cpos = ocfs2_sum_rightmost_rec(&eb->h_list);
|
|
root_end = ocfs2_sum_rightmost_rec(et->et_root_el);
|
|
|
|
/*
|
|
* If there is a gap before the root end and the real end
|
|
* of the righmost leaf block, we need to remove the gap
|
|
* between new_cpos and root_end first so that the tree
|
|
* is consistent after we add a new branch(it will start
|
|
* from new_cpos).
|
|
*/
|
|
if (root_end > new_cpos) {
|
|
mlog(0, "adjust the cluster end from %u to %u\n",
|
|
root_end, new_cpos);
|
|
status = ocfs2_adjust_rightmost_branch(handle, inode, et);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
/* allocate the number of new eb blocks we need */
|
|
new_eb_bhs = kcalloc(new_blocks, sizeof(struct buffer_head *),
|
|
GFP_KERNEL);
|
|
if (!new_eb_bhs) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_create_new_meta_bhs(osb, handle, inode, new_blocks,
|
|
meta_ac, new_eb_bhs);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* Note: new_eb_bhs[new_blocks - 1] is the guy which will be
|
|
* linked with the rest of the tree.
|
|
* conversly, new_eb_bhs[0] is the new bottommost leaf.
|
|
*
|
|
* when we leave the loop, new_last_eb_blk will point to the
|
|
* newest leaf, and next_blkno will point to the topmost extent
|
|
* block. */
|
|
next_blkno = new_last_eb_blk = 0;
|
|
for(i = 0; i < new_blocks; i++) {
|
|
bh = new_eb_bhs[i];
|
|
eb = (struct ocfs2_extent_block *) bh->b_data;
|
|
/* ocfs2_create_new_meta_bhs() should create it right! */
|
|
BUG_ON(!OCFS2_IS_VALID_EXTENT_BLOCK(eb));
|
|
eb_el = &eb->h_list;
|
|
|
|
status = ocfs2_journal_access_eb(handle, inode, bh,
|
|
OCFS2_JOURNAL_ACCESS_CREATE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
eb->h_next_leaf_blk = 0;
|
|
eb_el->l_tree_depth = cpu_to_le16(i);
|
|
eb_el->l_next_free_rec = cpu_to_le16(1);
|
|
/*
|
|
* This actually counts as an empty extent as
|
|
* c_clusters == 0
|
|
*/
|
|
eb_el->l_recs[0].e_cpos = cpu_to_le32(new_cpos);
|
|
eb_el->l_recs[0].e_blkno = cpu_to_le64(next_blkno);
|
|
/*
|
|
* eb_el isn't always an interior node, but even leaf
|
|
* nodes want a zero'd flags and reserved field so
|
|
* this gets the whole 32 bits regardless of use.
|
|
*/
|
|
eb_el->l_recs[0].e_int_clusters = cpu_to_le32(0);
|
|
if (!eb_el->l_tree_depth)
|
|
new_last_eb_blk = le64_to_cpu(eb->h_blkno);
|
|
|
|
status = ocfs2_journal_dirty(handle, bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
next_blkno = le64_to_cpu(eb->h_blkno);
|
|
}
|
|
|
|
/* This is a bit hairy. We want to update up to three blocks
|
|
* here without leaving any of them in an inconsistent state
|
|
* in case of error. We don't have to worry about
|
|
* journal_dirty erroring as it won't unless we've aborted the
|
|
* handle (in which case we would never be here) so reserving
|
|
* the write with journal_access is all we need to do. */
|
|
status = ocfs2_journal_access_eb(handle, inode, *last_eb_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
status = ocfs2_et_root_journal_access(handle, inode, et,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
if (eb_bh) {
|
|
status = ocfs2_journal_access_eb(handle, inode, eb_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
/* Link the new branch into the rest of the tree (el will
|
|
* either be on the root_bh, or the extent block passed in. */
|
|
i = le16_to_cpu(el->l_next_free_rec);
|
|
el->l_recs[i].e_blkno = cpu_to_le64(next_blkno);
|
|
el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
|
|
el->l_recs[i].e_int_clusters = 0;
|
|
le16_add_cpu(&el->l_next_free_rec, 1);
|
|
|
|
/* fe needs a new last extent block pointer, as does the
|
|
* next_leaf on the previously last-extent-block. */
|
|
ocfs2_et_set_last_eb_blk(et, new_last_eb_blk);
|
|
|
|
eb = (struct ocfs2_extent_block *) (*last_eb_bh)->b_data;
|
|
eb->h_next_leaf_blk = cpu_to_le64(new_last_eb_blk);
|
|
|
|
status = ocfs2_journal_dirty(handle, *last_eb_bh);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
status = ocfs2_journal_dirty(handle, et->et_root_bh);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
if (eb_bh) {
|
|
status = ocfs2_journal_dirty(handle, eb_bh);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
}
|
|
|
|
/*
|
|
* Some callers want to track the rightmost leaf so pass it
|
|
* back here.
|
|
*/
|
|
brelse(*last_eb_bh);
|
|
get_bh(new_eb_bhs[0]);
|
|
*last_eb_bh = new_eb_bhs[0];
|
|
|
|
status = 0;
|
|
bail:
|
|
if (new_eb_bhs) {
|
|
for (i = 0; i < new_blocks; i++)
|
|
brelse(new_eb_bhs[i]);
|
|
kfree(new_eb_bhs);
|
|
}
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* adds another level to the allocation tree.
|
|
* returns back the new extent block so you can add a branch to it
|
|
* after this call.
|
|
*/
|
|
static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct buffer_head **ret_new_eb_bh)
|
|
{
|
|
int status, i;
|
|
u32 new_clusters;
|
|
struct buffer_head *new_eb_bh = NULL;
|
|
struct ocfs2_extent_block *eb;
|
|
struct ocfs2_extent_list *root_el;
|
|
struct ocfs2_extent_list *eb_el;
|
|
|
|
mlog_entry_void();
|
|
|
|
status = ocfs2_create_new_meta_bhs(osb, handle, inode, 1, meta_ac,
|
|
&new_eb_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
eb = (struct ocfs2_extent_block *) new_eb_bh->b_data;
|
|
/* ocfs2_create_new_meta_bhs() should create it right! */
|
|
BUG_ON(!OCFS2_IS_VALID_EXTENT_BLOCK(eb));
|
|
|
|
eb_el = &eb->h_list;
|
|
root_el = et->et_root_el;
|
|
|
|
status = ocfs2_journal_access_eb(handle, inode, new_eb_bh,
|
|
OCFS2_JOURNAL_ACCESS_CREATE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* copy the root extent list data into the new extent block */
|
|
eb_el->l_tree_depth = root_el->l_tree_depth;
|
|
eb_el->l_next_free_rec = root_el->l_next_free_rec;
|
|
for (i = 0; i < le16_to_cpu(root_el->l_next_free_rec); i++)
|
|
eb_el->l_recs[i] = root_el->l_recs[i];
|
|
|
|
status = ocfs2_journal_dirty(handle, new_eb_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_et_root_journal_access(handle, inode, et,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
new_clusters = ocfs2_sum_rightmost_rec(eb_el);
|
|
|
|
/* update root_bh now */
|
|
le16_add_cpu(&root_el->l_tree_depth, 1);
|
|
root_el->l_recs[0].e_cpos = 0;
|
|
root_el->l_recs[0].e_blkno = eb->h_blkno;
|
|
root_el->l_recs[0].e_int_clusters = cpu_to_le32(new_clusters);
|
|
for (i = 1; i < le16_to_cpu(root_el->l_next_free_rec); i++)
|
|
memset(&root_el->l_recs[i], 0, sizeof(struct ocfs2_extent_rec));
|
|
root_el->l_next_free_rec = cpu_to_le16(1);
|
|
|
|
/* If this is our 1st tree depth shift, then last_eb_blk
|
|
* becomes the allocated extent block */
|
|
if (root_el->l_tree_depth == cpu_to_le16(1))
|
|
ocfs2_et_set_last_eb_blk(et, le64_to_cpu(eb->h_blkno));
|
|
|
|
status = ocfs2_journal_dirty(handle, et->et_root_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
*ret_new_eb_bh = new_eb_bh;
|
|
new_eb_bh = NULL;
|
|
status = 0;
|
|
bail:
|
|
brelse(new_eb_bh);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Should only be called when there is no space left in any of the
|
|
* leaf nodes. What we want to do is find the lowest tree depth
|
|
* non-leaf extent block with room for new records. There are three
|
|
* valid results of this search:
|
|
*
|
|
* 1) a lowest extent block is found, then we pass it back in
|
|
* *lowest_eb_bh and return '0'
|
|
*
|
|
* 2) the search fails to find anything, but the root_el has room. We
|
|
* pass NULL back in *lowest_eb_bh, but still return '0'
|
|
*
|
|
* 3) the search fails to find anything AND the root_el is full, in
|
|
* which case we return > 0
|
|
*
|
|
* return status < 0 indicates an error.
|
|
*/
|
|
static int ocfs2_find_branch_target(struct ocfs2_super *osb,
|
|
struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
struct buffer_head **target_bh)
|
|
{
|
|
int status = 0, i;
|
|
u64 blkno;
|
|
struct ocfs2_extent_block *eb;
|
|
struct ocfs2_extent_list *el;
|
|
struct buffer_head *bh = NULL;
|
|
struct buffer_head *lowest_bh = NULL;
|
|
|
|
mlog_entry_void();
|
|
|
|
*target_bh = NULL;
|
|
|
|
el = et->et_root_el;
|
|
|
|
while(le16_to_cpu(el->l_tree_depth) > 1) {
|
|
if (le16_to_cpu(el->l_next_free_rec) == 0) {
|
|
ocfs2_error(inode->i_sb, "Dinode %llu has empty "
|
|
"extent list (next_free_rec == 0)",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
status = -EIO;
|
|
goto bail;
|
|
}
|
|
i = le16_to_cpu(el->l_next_free_rec) - 1;
|
|
blkno = le64_to_cpu(el->l_recs[i].e_blkno);
|
|
if (!blkno) {
|
|
ocfs2_error(inode->i_sb, "Dinode %llu has extent "
|
|
"list where extent # %d has no physical "
|
|
"block start",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, i);
|
|
status = -EIO;
|
|
goto bail;
|
|
}
|
|
|
|
brelse(bh);
|
|
bh = NULL;
|
|
|
|
status = ocfs2_read_extent_block(inode, blkno, &bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
eb = (struct ocfs2_extent_block *) bh->b_data;
|
|
el = &eb->h_list;
|
|
|
|
if (le16_to_cpu(el->l_next_free_rec) <
|
|
le16_to_cpu(el->l_count)) {
|
|
brelse(lowest_bh);
|
|
lowest_bh = bh;
|
|
get_bh(lowest_bh);
|
|
}
|
|
}
|
|
|
|
/* If we didn't find one and the fe doesn't have any room,
|
|
* then return '1' */
|
|
el = et->et_root_el;
|
|
if (!lowest_bh && (el->l_next_free_rec == el->l_count))
|
|
status = 1;
|
|
|
|
*target_bh = lowest_bh;
|
|
bail:
|
|
brelse(bh);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Grow a b-tree so that it has more records.
|
|
*
|
|
* We might shift the tree depth in which case existing paths should
|
|
* be considered invalid.
|
|
*
|
|
* Tree depth after the grow is returned via *final_depth.
|
|
*
|
|
* *last_eb_bh will be updated by ocfs2_add_branch().
|
|
*/
|
|
static int ocfs2_grow_tree(struct inode *inode, handle_t *handle,
|
|
struct ocfs2_extent_tree *et, int *final_depth,
|
|
struct buffer_head **last_eb_bh,
|
|
struct ocfs2_alloc_context *meta_ac)
|
|
{
|
|
int ret, shift;
|
|
struct ocfs2_extent_list *el = et->et_root_el;
|
|
int depth = le16_to_cpu(el->l_tree_depth);
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
struct buffer_head *bh = NULL;
|
|
|
|
BUG_ON(meta_ac == NULL);
|
|
|
|
shift = ocfs2_find_branch_target(osb, inode, et, &bh);
|
|
if (shift < 0) {
|
|
ret = shift;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/* We traveled all the way to the bottom of the allocation tree
|
|
* and didn't find room for any more extents - we need to add
|
|
* another tree level */
|
|
if (shift) {
|
|
BUG_ON(bh);
|
|
mlog(0, "need to shift tree depth (current = %d)\n", depth);
|
|
|
|
/* ocfs2_shift_tree_depth will return us a buffer with
|
|
* the new extent block (so we can pass that to
|
|
* ocfs2_add_branch). */
|
|
ret = ocfs2_shift_tree_depth(osb, handle, inode, et,
|
|
meta_ac, &bh);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
depth++;
|
|
if (depth == 1) {
|
|
/*
|
|
* Special case: we have room now if we shifted from
|
|
* tree_depth 0, so no more work needs to be done.
|
|
*
|
|
* We won't be calling add_branch, so pass
|
|
* back *last_eb_bh as the new leaf. At depth
|
|
* zero, it should always be null so there's
|
|
* no reason to brelse.
|
|
*/
|
|
BUG_ON(*last_eb_bh);
|
|
get_bh(bh);
|
|
*last_eb_bh = bh;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* call ocfs2_add_branch to add the final part of the tree with
|
|
* the new data. */
|
|
mlog(0, "add branch. bh = %p\n", bh);
|
|
ret = ocfs2_add_branch(osb, handle, inode, et, bh, last_eb_bh,
|
|
meta_ac);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (final_depth)
|
|
*final_depth = depth;
|
|
brelse(bh);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This function will discard the rightmost extent record.
|
|
*/
|
|
static void ocfs2_shift_records_right(struct ocfs2_extent_list *el)
|
|
{
|
|
int next_free = le16_to_cpu(el->l_next_free_rec);
|
|
int count = le16_to_cpu(el->l_count);
|
|
unsigned int num_bytes;
|
|
|
|
BUG_ON(!next_free);
|
|
/* This will cause us to go off the end of our extent list. */
|
|
BUG_ON(next_free >= count);
|
|
|
|
num_bytes = sizeof(struct ocfs2_extent_rec) * next_free;
|
|
|
|
memmove(&el->l_recs[1], &el->l_recs[0], num_bytes);
|
|
}
|
|
|
|
static void ocfs2_rotate_leaf(struct ocfs2_extent_list *el,
|
|
struct ocfs2_extent_rec *insert_rec)
|
|
{
|
|
int i, insert_index, next_free, has_empty, num_bytes;
|
|
u32 insert_cpos = le32_to_cpu(insert_rec->e_cpos);
|
|
struct ocfs2_extent_rec *rec;
|
|
|
|
next_free = le16_to_cpu(el->l_next_free_rec);
|
|
has_empty = ocfs2_is_empty_extent(&el->l_recs[0]);
|
|
|
|
BUG_ON(!next_free);
|
|
|
|
/* The tree code before us didn't allow enough room in the leaf. */
|
|
BUG_ON(el->l_next_free_rec == el->l_count && !has_empty);
|
|
|
|
/*
|
|
* The easiest way to approach this is to just remove the
|
|
* empty extent and temporarily decrement next_free.
|
|
*/
|
|
if (has_empty) {
|
|
/*
|
|
* If next_free was 1 (only an empty extent), this
|
|
* loop won't execute, which is fine. We still want
|
|
* the decrement above to happen.
|
|
*/
|
|
for(i = 0; i < (next_free - 1); i++)
|
|
el->l_recs[i] = el->l_recs[i+1];
|
|
|
|
next_free--;
|
|
}
|
|
|
|
/*
|
|
* Figure out what the new record index should be.
|
|
*/
|
|
for(i = 0; i < next_free; i++) {
|
|
rec = &el->l_recs[i];
|
|
|
|
if (insert_cpos < le32_to_cpu(rec->e_cpos))
|
|
break;
|
|
}
|
|
insert_index = i;
|
|
|
|
mlog(0, "ins %u: index %d, has_empty %d, next_free %d, count %d\n",
|
|
insert_cpos, insert_index, has_empty, next_free, le16_to_cpu(el->l_count));
|
|
|
|
BUG_ON(insert_index < 0);
|
|
BUG_ON(insert_index >= le16_to_cpu(el->l_count));
|
|
BUG_ON(insert_index > next_free);
|
|
|
|
/*
|
|
* No need to memmove if we're just adding to the tail.
|
|
*/
|
|
if (insert_index != next_free) {
|
|
BUG_ON(next_free >= le16_to_cpu(el->l_count));
|
|
|
|
num_bytes = next_free - insert_index;
|
|
num_bytes *= sizeof(struct ocfs2_extent_rec);
|
|
memmove(&el->l_recs[insert_index + 1],
|
|
&el->l_recs[insert_index],
|
|
num_bytes);
|
|
}
|
|
|
|
/*
|
|
* Either we had an empty extent, and need to re-increment or
|
|
* there was no empty extent on a non full rightmost leaf node,
|
|
* in which case we still need to increment.
|
|
*/
|
|
next_free++;
|
|
el->l_next_free_rec = cpu_to_le16(next_free);
|
|
/*
|
|
* Make sure none of the math above just messed up our tree.
|
|
*/
|
|
BUG_ON(le16_to_cpu(el->l_next_free_rec) > le16_to_cpu(el->l_count));
|
|
|
|
el->l_recs[insert_index] = *insert_rec;
|
|
|
|
}
|
|
|
|
static void ocfs2_remove_empty_extent(struct ocfs2_extent_list *el)
|
|
{
|
|
int size, num_recs = le16_to_cpu(el->l_next_free_rec);
|
|
|
|
BUG_ON(num_recs == 0);
|
|
|
|
if (ocfs2_is_empty_extent(&el->l_recs[0])) {
|
|
num_recs--;
|
|
size = num_recs * sizeof(struct ocfs2_extent_rec);
|
|
memmove(&el->l_recs[0], &el->l_recs[1], size);
|
|
memset(&el->l_recs[num_recs], 0,
|
|
sizeof(struct ocfs2_extent_rec));
|
|
el->l_next_free_rec = cpu_to_le16(num_recs);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create an empty extent record .
|
|
*
|
|
* l_next_free_rec may be updated.
|
|
*
|
|
* If an empty extent already exists do nothing.
|
|
*/
|
|
static void ocfs2_create_empty_extent(struct ocfs2_extent_list *el)
|
|
{
|
|
int next_free = le16_to_cpu(el->l_next_free_rec);
|
|
|
|
BUG_ON(le16_to_cpu(el->l_tree_depth) != 0);
|
|
|
|
if (next_free == 0)
|
|
goto set_and_inc;
|
|
|
|
if (ocfs2_is_empty_extent(&el->l_recs[0]))
|
|
return;
|
|
|
|
mlog_bug_on_msg(el->l_count == el->l_next_free_rec,
|
|
"Asked to create an empty extent in a full list:\n"
|
|
"count = %u, tree depth = %u",
|
|
le16_to_cpu(el->l_count),
|
|
le16_to_cpu(el->l_tree_depth));
|
|
|
|
ocfs2_shift_records_right(el);
|
|
|
|
set_and_inc:
|
|
le16_add_cpu(&el->l_next_free_rec, 1);
|
|
memset(&el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec));
|
|
}
|
|
|
|
/*
|
|
* For a rotation which involves two leaf nodes, the "root node" is
|
|
* the lowest level tree node which contains a path to both leafs. This
|
|
* resulting set of information can be used to form a complete "subtree"
|
|
*
|
|
* This function is passed two full paths from the dinode down to a
|
|
* pair of adjacent leaves. It's task is to figure out which path
|
|
* index contains the subtree root - this can be the root index itself
|
|
* in a worst-case rotation.
|
|
*
|
|
* The array index of the subtree root is passed back.
|
|
*/
|
|
static int ocfs2_find_subtree_root(struct inode *inode,
|
|
struct ocfs2_path *left,
|
|
struct ocfs2_path *right)
|
|
{
|
|
int i = 0;
|
|
|
|
/*
|
|
* Check that the caller passed in two paths from the same tree.
|
|
*/
|
|
BUG_ON(path_root_bh(left) != path_root_bh(right));
|
|
|
|
do {
|
|
i++;
|
|
|
|
/*
|
|
* The caller didn't pass two adjacent paths.
|
|
*/
|
|
mlog_bug_on_msg(i > left->p_tree_depth,
|
|
"Inode %lu, left depth %u, right depth %u\n"
|
|
"left leaf blk %llu, right leaf blk %llu\n",
|
|
inode->i_ino, left->p_tree_depth,
|
|
right->p_tree_depth,
|
|
(unsigned long long)path_leaf_bh(left)->b_blocknr,
|
|
(unsigned long long)path_leaf_bh(right)->b_blocknr);
|
|
} while (left->p_node[i].bh->b_blocknr ==
|
|
right->p_node[i].bh->b_blocknr);
|
|
|
|
return i - 1;
|
|
}
|
|
|
|
typedef void (path_insert_t)(void *, struct buffer_head *);
|
|
|
|
/*
|
|
* Traverse a btree path in search of cpos, starting at root_el.
|
|
*
|
|
* This code can be called with a cpos larger than the tree, in which
|
|
* case it will return the rightmost path.
|
|
*/
|
|
static int __ocfs2_find_path(struct inode *inode,
|
|
struct ocfs2_extent_list *root_el, u32 cpos,
|
|
path_insert_t *func, void *data)
|
|
{
|
|
int i, ret = 0;
|
|
u32 range;
|
|
u64 blkno;
|
|
struct buffer_head *bh = NULL;
|
|
struct ocfs2_extent_block *eb;
|
|
struct ocfs2_extent_list *el;
|
|
struct ocfs2_extent_rec *rec;
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
|
|
el = root_el;
|
|
while (el->l_tree_depth) {
|
|
if (le16_to_cpu(el->l_next_free_rec) == 0) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu has empty extent list at "
|
|
"depth %u\n",
|
|
(unsigned long long)oi->ip_blkno,
|
|
le16_to_cpu(el->l_tree_depth));
|
|
ret = -EROFS;
|
|
goto out;
|
|
|
|
}
|
|
|
|
for(i = 0; i < le16_to_cpu(el->l_next_free_rec) - 1; i++) {
|
|
rec = &el->l_recs[i];
|
|
|
|
/*
|
|
* In the case that cpos is off the allocation
|
|
* tree, this should just wind up returning the
|
|
* rightmost record.
|
|
*/
|
|
range = le32_to_cpu(rec->e_cpos) +
|
|
ocfs2_rec_clusters(el, rec);
|
|
if (cpos >= le32_to_cpu(rec->e_cpos) && cpos < range)
|
|
break;
|
|
}
|
|
|
|
blkno = le64_to_cpu(el->l_recs[i].e_blkno);
|
|
if (blkno == 0) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu has bad blkno in extent list "
|
|
"at depth %u (index %d)\n",
|
|
(unsigned long long)oi->ip_blkno,
|
|
le16_to_cpu(el->l_tree_depth), i);
|
|
ret = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
brelse(bh);
|
|
bh = NULL;
|
|
ret = ocfs2_read_extent_block(inode, blkno, &bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
eb = (struct ocfs2_extent_block *) bh->b_data;
|
|
el = &eb->h_list;
|
|
|
|
if (le16_to_cpu(el->l_next_free_rec) >
|
|
le16_to_cpu(el->l_count)) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu has bad count in extent list "
|
|
"at block %llu (next free=%u, count=%u)\n",
|
|
(unsigned long long)oi->ip_blkno,
|
|
(unsigned long long)bh->b_blocknr,
|
|
le16_to_cpu(el->l_next_free_rec),
|
|
le16_to_cpu(el->l_count));
|
|
ret = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
if (func)
|
|
func(data, bh);
|
|
}
|
|
|
|
out:
|
|
/*
|
|
* Catch any trailing bh that the loop didn't handle.
|
|
*/
|
|
brelse(bh);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Given an initialized path (that is, it has a valid root extent
|
|
* list), this function will traverse the btree in search of the path
|
|
* which would contain cpos.
|
|
*
|
|
* The path traveled is recorded in the path structure.
|
|
*
|
|
* Note that this will not do any comparisons on leaf node extent
|
|
* records, so it will work fine in the case that we just added a tree
|
|
* branch.
|
|
*/
|
|
struct find_path_data {
|
|
int index;
|
|
struct ocfs2_path *path;
|
|
};
|
|
static void find_path_ins(void *data, struct buffer_head *bh)
|
|
{
|
|
struct find_path_data *fp = data;
|
|
|
|
get_bh(bh);
|
|
ocfs2_path_insert_eb(fp->path, fp->index, bh);
|
|
fp->index++;
|
|
}
|
|
static int ocfs2_find_path(struct inode *inode, struct ocfs2_path *path,
|
|
u32 cpos)
|
|
{
|
|
struct find_path_data data;
|
|
|
|
data.index = 1;
|
|
data.path = path;
|
|
return __ocfs2_find_path(inode, path_root_el(path), cpos,
|
|
find_path_ins, &data);
|
|
}
|
|
|
|
static void find_leaf_ins(void *data, struct buffer_head *bh)
|
|
{
|
|
struct ocfs2_extent_block *eb =(struct ocfs2_extent_block *)bh->b_data;
|
|
struct ocfs2_extent_list *el = &eb->h_list;
|
|
struct buffer_head **ret = data;
|
|
|
|
/* We want to retain only the leaf block. */
|
|
if (le16_to_cpu(el->l_tree_depth) == 0) {
|
|
get_bh(bh);
|
|
*ret = bh;
|
|
}
|
|
}
|
|
/*
|
|
* Find the leaf block in the tree which would contain cpos. No
|
|
* checking of the actual leaf is done.
|
|
*
|
|
* Some paths want to call this instead of allocating a path structure
|
|
* and calling ocfs2_find_path().
|
|
*
|
|
* This function doesn't handle non btree extent lists.
|
|
*/
|
|
int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
|
|
u32 cpos, struct buffer_head **leaf_bh)
|
|
{
|
|
int ret;
|
|
struct buffer_head *bh = NULL;
|
|
|
|
ret = __ocfs2_find_path(inode, root_el, cpos, find_leaf_ins, &bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
*leaf_bh = bh;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Adjust the adjacent records (left_rec, right_rec) involved in a rotation.
|
|
*
|
|
* Basically, we've moved stuff around at the bottom of the tree and
|
|
* we need to fix up the extent records above the changes to reflect
|
|
* the new changes.
|
|
*
|
|
* left_rec: the record on the left.
|
|
* left_child_el: is the child list pointed to by left_rec
|
|
* right_rec: the record to the right of left_rec
|
|
* right_child_el: is the child list pointed to by right_rec
|
|
*
|
|
* By definition, this only works on interior nodes.
|
|
*/
|
|
static void ocfs2_adjust_adjacent_records(struct ocfs2_extent_rec *left_rec,
|
|
struct ocfs2_extent_list *left_child_el,
|
|
struct ocfs2_extent_rec *right_rec,
|
|
struct ocfs2_extent_list *right_child_el)
|
|
{
|
|
u32 left_clusters, right_end;
|
|
|
|
/*
|
|
* Interior nodes never have holes. Their cpos is the cpos of
|
|
* the leftmost record in their child list. Their cluster
|
|
* count covers the full theoretical range of their child list
|
|
* - the range between their cpos and the cpos of the record
|
|
* immediately to their right.
|
|
*/
|
|
left_clusters = le32_to_cpu(right_child_el->l_recs[0].e_cpos);
|
|
if (!ocfs2_rec_clusters(right_child_el, &right_child_el->l_recs[0])) {
|
|
BUG_ON(right_child_el->l_tree_depth);
|
|
BUG_ON(le16_to_cpu(right_child_el->l_next_free_rec) <= 1);
|
|
left_clusters = le32_to_cpu(right_child_el->l_recs[1].e_cpos);
|
|
}
|
|
left_clusters -= le32_to_cpu(left_rec->e_cpos);
|
|
left_rec->e_int_clusters = cpu_to_le32(left_clusters);
|
|
|
|
/*
|
|
* Calculate the rightmost cluster count boundary before
|
|
* moving cpos - we will need to adjust clusters after
|
|
* updating e_cpos to keep the same highest cluster count.
|
|
*/
|
|
right_end = le32_to_cpu(right_rec->e_cpos);
|
|
right_end += le32_to_cpu(right_rec->e_int_clusters);
|
|
|
|
right_rec->e_cpos = left_rec->e_cpos;
|
|
le32_add_cpu(&right_rec->e_cpos, left_clusters);
|
|
|
|
right_end -= le32_to_cpu(right_rec->e_cpos);
|
|
right_rec->e_int_clusters = cpu_to_le32(right_end);
|
|
}
|
|
|
|
/*
|
|
* Adjust the adjacent root node records involved in a
|
|
* rotation. left_el_blkno is passed in as a key so that we can easily
|
|
* find it's index in the root list.
|
|
*/
|
|
static void ocfs2_adjust_root_records(struct ocfs2_extent_list *root_el,
|
|
struct ocfs2_extent_list *left_el,
|
|
struct ocfs2_extent_list *right_el,
|
|
u64 left_el_blkno)
|
|
{
|
|
int i;
|
|
|
|
BUG_ON(le16_to_cpu(root_el->l_tree_depth) <=
|
|
le16_to_cpu(left_el->l_tree_depth));
|
|
|
|
for(i = 0; i < le16_to_cpu(root_el->l_next_free_rec) - 1; i++) {
|
|
if (le64_to_cpu(root_el->l_recs[i].e_blkno) == left_el_blkno)
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* The path walking code should have never returned a root and
|
|
* two paths which are not adjacent.
|
|
*/
|
|
BUG_ON(i >= (le16_to_cpu(root_el->l_next_free_rec) - 1));
|
|
|
|
ocfs2_adjust_adjacent_records(&root_el->l_recs[i], left_el,
|
|
&root_el->l_recs[i + 1], right_el);
|
|
}
|
|
|
|
/*
|
|
* We've changed a leaf block (in right_path) and need to reflect that
|
|
* change back up the subtree.
|
|
*
|
|
* This happens in multiple places:
|
|
* - When we've moved an extent record from the left path leaf to the right
|
|
* path leaf to make room for an empty extent in the left path leaf.
|
|
* - When our insert into the right path leaf is at the leftmost edge
|
|
* and requires an update of the path immediately to it's left. This
|
|
* can occur at the end of some types of rotation and appending inserts.
|
|
* - When we've adjusted the last extent record in the left path leaf and the
|
|
* 1st extent record in the right path leaf during cross extent block merge.
|
|
*/
|
|
static void ocfs2_complete_edge_insert(struct inode *inode, handle_t *handle,
|
|
struct ocfs2_path *left_path,
|
|
struct ocfs2_path *right_path,
|
|
int subtree_index)
|
|
{
|
|
int ret, i, idx;
|
|
struct ocfs2_extent_list *el, *left_el, *right_el;
|
|
struct ocfs2_extent_rec *left_rec, *right_rec;
|
|
struct buffer_head *root_bh = left_path->p_node[subtree_index].bh;
|
|
|
|
/*
|
|
* Update the counts and position values within all the
|
|
* interior nodes to reflect the leaf rotation we just did.
|
|
*
|
|
* The root node is handled below the loop.
|
|
*
|
|
* We begin the loop with right_el and left_el pointing to the
|
|
* leaf lists and work our way up.
|
|
*
|
|
* NOTE: within this loop, left_el and right_el always refer
|
|
* to the *child* lists.
|
|
*/
|
|
left_el = path_leaf_el(left_path);
|
|
right_el = path_leaf_el(right_path);
|
|
for(i = left_path->p_tree_depth - 1; i > subtree_index; i--) {
|
|
mlog(0, "Adjust records at index %u\n", i);
|
|
|
|
/*
|
|
* One nice property of knowing that all of these
|
|
* nodes are below the root is that we only deal with
|
|
* the leftmost right node record and the rightmost
|
|
* left node record.
|
|
*/
|
|
el = left_path->p_node[i].el;
|
|
idx = le16_to_cpu(left_el->l_next_free_rec) - 1;
|
|
left_rec = &el->l_recs[idx];
|
|
|
|
el = right_path->p_node[i].el;
|
|
right_rec = &el->l_recs[0];
|
|
|
|
ocfs2_adjust_adjacent_records(left_rec, left_el, right_rec,
|
|
right_el);
|
|
|
|
ret = ocfs2_journal_dirty(handle, left_path->p_node[i].bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
ret = ocfs2_journal_dirty(handle, right_path->p_node[i].bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
/*
|
|
* Setup our list pointers now so that the current
|
|
* parents become children in the next iteration.
|
|
*/
|
|
left_el = left_path->p_node[i].el;
|
|
right_el = right_path->p_node[i].el;
|
|
}
|
|
|
|
/*
|
|
* At the root node, adjust the two adjacent records which
|
|
* begin our path to the leaves.
|
|
*/
|
|
|
|
el = left_path->p_node[subtree_index].el;
|
|
left_el = left_path->p_node[subtree_index + 1].el;
|
|
right_el = right_path->p_node[subtree_index + 1].el;
|
|
|
|
ocfs2_adjust_root_records(el, left_el, right_el,
|
|
left_path->p_node[subtree_index + 1].bh->b_blocknr);
|
|
|
|
root_bh = left_path->p_node[subtree_index].bh;
|
|
|
|
ret = ocfs2_journal_dirty(handle, root_bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
static int ocfs2_rotate_subtree_right(struct inode *inode,
|
|
handle_t *handle,
|
|
struct ocfs2_path *left_path,
|
|
struct ocfs2_path *right_path,
|
|
int subtree_index)
|
|
{
|
|
int ret, i;
|
|
struct buffer_head *right_leaf_bh;
|
|
struct buffer_head *left_leaf_bh = NULL;
|
|
struct buffer_head *root_bh;
|
|
struct ocfs2_extent_list *right_el, *left_el;
|
|
struct ocfs2_extent_rec move_rec;
|
|
|
|
left_leaf_bh = path_leaf_bh(left_path);
|
|
left_el = path_leaf_el(left_path);
|
|
|
|
if (left_el->l_next_free_rec != left_el->l_count) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu has non-full interior leaf node %llu"
|
|
"(next free = %u)",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
(unsigned long long)left_leaf_bh->b_blocknr,
|
|
le16_to_cpu(left_el->l_next_free_rec));
|
|
return -EROFS;
|
|
}
|
|
|
|
/*
|
|
* This extent block may already have an empty record, so we
|
|
* return early if so.
|
|
*/
|
|
if (ocfs2_is_empty_extent(&left_el->l_recs[0]))
|
|
return 0;
|
|
|
|
root_bh = left_path->p_node[subtree_index].bh;
|
|
BUG_ON(root_bh != right_path->p_node[subtree_index].bh);
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
|
|
subtree_index);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
for(i = subtree_index + 1; i < path_num_items(right_path); i++) {
|
|
ret = ocfs2_path_bh_journal_access(handle, inode,
|
|
right_path, i);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode,
|
|
left_path, i);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
right_leaf_bh = path_leaf_bh(right_path);
|
|
right_el = path_leaf_el(right_path);
|
|
|
|
/* This is a code error, not a disk corruption. */
|
|
mlog_bug_on_msg(!right_el->l_next_free_rec, "Inode %llu: Rotate fails "
|
|
"because rightmost leaf block %llu is empty\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
(unsigned long long)right_leaf_bh->b_blocknr);
|
|
|
|
ocfs2_create_empty_extent(right_el);
|
|
|
|
ret = ocfs2_journal_dirty(handle, right_leaf_bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/* Do the copy now. */
|
|
i = le16_to_cpu(left_el->l_next_free_rec) - 1;
|
|
move_rec = left_el->l_recs[i];
|
|
right_el->l_recs[0] = move_rec;
|
|
|
|
/*
|
|
* Clear out the record we just copied and shift everything
|
|
* over, leaving an empty extent in the left leaf.
|
|
*
|
|
* We temporarily subtract from next_free_rec so that the
|
|
* shift will lose the tail record (which is now defunct).
|
|
*/
|
|
le16_add_cpu(&left_el->l_next_free_rec, -1);
|
|
ocfs2_shift_records_right(left_el);
|
|
memset(&left_el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec));
|
|
le16_add_cpu(&left_el->l_next_free_rec, 1);
|
|
|
|
ret = ocfs2_journal_dirty(handle, left_leaf_bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_complete_edge_insert(inode, handle, left_path, right_path,
|
|
subtree_index);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Given a full path, determine what cpos value would return us a path
|
|
* containing the leaf immediately to the left of the current one.
|
|
*
|
|
* Will return zero if the path passed in is already the leftmost path.
|
|
*/
|
|
static int ocfs2_find_cpos_for_left_leaf(struct super_block *sb,
|
|
struct ocfs2_path *path, u32 *cpos)
|
|
{
|
|
int i, j, ret = 0;
|
|
u64 blkno;
|
|
struct ocfs2_extent_list *el;
|
|
|
|
BUG_ON(path->p_tree_depth == 0);
|
|
|
|
*cpos = 0;
|
|
|
|
blkno = path_leaf_bh(path)->b_blocknr;
|
|
|
|
/* Start at the tree node just above the leaf and work our way up. */
|
|
i = path->p_tree_depth - 1;
|
|
while (i >= 0) {
|
|
el = path->p_node[i].el;
|
|
|
|
/*
|
|
* Find the extent record just before the one in our
|
|
* path.
|
|
*/
|
|
for(j = 0; j < le16_to_cpu(el->l_next_free_rec); j++) {
|
|
if (le64_to_cpu(el->l_recs[j].e_blkno) == blkno) {
|
|
if (j == 0) {
|
|
if (i == 0) {
|
|
/*
|
|
* We've determined that the
|
|
* path specified is already
|
|
* the leftmost one - return a
|
|
* cpos of zero.
|
|
*/
|
|
goto out;
|
|
}
|
|
/*
|
|
* The leftmost record points to our
|
|
* leaf - we need to travel up the
|
|
* tree one level.
|
|
*/
|
|
goto next_node;
|
|
}
|
|
|
|
*cpos = le32_to_cpu(el->l_recs[j - 1].e_cpos);
|
|
*cpos = *cpos + ocfs2_rec_clusters(el,
|
|
&el->l_recs[j - 1]);
|
|
*cpos = *cpos - 1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we got here, we never found a valid node where
|
|
* the tree indicated one should be.
|
|
*/
|
|
ocfs2_error(sb,
|
|
"Invalid extent tree at extent block %llu\n",
|
|
(unsigned long long)blkno);
|
|
ret = -EROFS;
|
|
goto out;
|
|
|
|
next_node:
|
|
blkno = path->p_node[i].bh->b_blocknr;
|
|
i--;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Extend the transaction by enough credits to complete the rotation,
|
|
* and still leave at least the original number of credits allocated
|
|
* to this transaction.
|
|
*/
|
|
static int ocfs2_extend_rotate_transaction(handle_t *handle, int subtree_depth,
|
|
int op_credits,
|
|
struct ocfs2_path *path)
|
|
{
|
|
int credits = (path->p_tree_depth - subtree_depth) * 2 + 1 + op_credits;
|
|
|
|
if (handle->h_buffer_credits < credits)
|
|
return ocfs2_extend_trans(handle, credits);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Trap the case where we're inserting into the theoretical range past
|
|
* the _actual_ left leaf range. Otherwise, we'll rotate a record
|
|
* whose cpos is less than ours into the right leaf.
|
|
*
|
|
* It's only necessary to look at the rightmost record of the left
|
|
* leaf because the logic that calls us should ensure that the
|
|
* theoretical ranges in the path components above the leaves are
|
|
* correct.
|
|
*/
|
|
static int ocfs2_rotate_requires_path_adjustment(struct ocfs2_path *left_path,
|
|
u32 insert_cpos)
|
|
{
|
|
struct ocfs2_extent_list *left_el;
|
|
struct ocfs2_extent_rec *rec;
|
|
int next_free;
|
|
|
|
left_el = path_leaf_el(left_path);
|
|
next_free = le16_to_cpu(left_el->l_next_free_rec);
|
|
rec = &left_el->l_recs[next_free - 1];
|
|
|
|
if (insert_cpos > le32_to_cpu(rec->e_cpos))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int ocfs2_leftmost_rec_contains(struct ocfs2_extent_list *el, u32 cpos)
|
|
{
|
|
int next_free = le16_to_cpu(el->l_next_free_rec);
|
|
unsigned int range;
|
|
struct ocfs2_extent_rec *rec;
|
|
|
|
if (next_free == 0)
|
|
return 0;
|
|
|
|
rec = &el->l_recs[0];
|
|
if (ocfs2_is_empty_extent(rec)) {
|
|
/* Empty list. */
|
|
if (next_free == 1)
|
|
return 0;
|
|
rec = &el->l_recs[1];
|
|
}
|
|
|
|
range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
|
|
if (cpos >= le32_to_cpu(rec->e_cpos) && cpos < range)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Rotate all the records in a btree right one record, starting at insert_cpos.
|
|
*
|
|
* The path to the rightmost leaf should be passed in.
|
|
*
|
|
* The array is assumed to be large enough to hold an entire path (tree depth).
|
|
*
|
|
* Upon succesful return from this function:
|
|
*
|
|
* - The 'right_path' array will contain a path to the leaf block
|
|
* whose range contains e_cpos.
|
|
* - That leaf block will have a single empty extent in list index 0.
|
|
* - In the case that the rotation requires a post-insert update,
|
|
* *ret_left_path will contain a valid path which can be passed to
|
|
* ocfs2_insert_path().
|
|
*/
|
|
static int ocfs2_rotate_tree_right(struct inode *inode,
|
|
handle_t *handle,
|
|
enum ocfs2_split_type split,
|
|
u32 insert_cpos,
|
|
struct ocfs2_path *right_path,
|
|
struct ocfs2_path **ret_left_path)
|
|
{
|
|
int ret, start, orig_credits = handle->h_buffer_credits;
|
|
u32 cpos;
|
|
struct ocfs2_path *left_path = NULL;
|
|
|
|
*ret_left_path = NULL;
|
|
|
|
left_path = ocfs2_new_path_from_path(right_path);
|
|
if (!left_path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, right_path, &cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
mlog(0, "Insert: %u, first left path cpos: %u\n", insert_cpos, cpos);
|
|
|
|
/*
|
|
* What we want to do here is:
|
|
*
|
|
* 1) Start with the rightmost path.
|
|
*
|
|
* 2) Determine a path to the leaf block directly to the left
|
|
* of that leaf.
|
|
*
|
|
* 3) Determine the 'subtree root' - the lowest level tree node
|
|
* which contains a path to both leaves.
|
|
*
|
|
* 4) Rotate the subtree.
|
|
*
|
|
* 5) Find the next subtree by considering the left path to be
|
|
* the new right path.
|
|
*
|
|
* The check at the top of this while loop also accepts
|
|
* insert_cpos == cpos because cpos is only a _theoretical_
|
|
* value to get us the left path - insert_cpos might very well
|
|
* be filling that hole.
|
|
*
|
|
* Stop at a cpos of '0' because we either started at the
|
|
* leftmost branch (i.e., a tree with one branch and a
|
|
* rotation inside of it), or we've gone as far as we can in
|
|
* rotating subtrees.
|
|
*/
|
|
while (cpos && insert_cpos <= cpos) {
|
|
mlog(0, "Rotating a tree: ins. cpos: %u, left path cpos: %u\n",
|
|
insert_cpos, cpos);
|
|
|
|
ret = ocfs2_find_path(inode, left_path, cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
mlog_bug_on_msg(path_leaf_bh(left_path) ==
|
|
path_leaf_bh(right_path),
|
|
"Inode %lu: error during insert of %u "
|
|
"(left path cpos %u) results in two identical "
|
|
"paths ending at %llu\n",
|
|
inode->i_ino, insert_cpos, cpos,
|
|
(unsigned long long)
|
|
path_leaf_bh(left_path)->b_blocknr);
|
|
|
|
if (split == SPLIT_NONE &&
|
|
ocfs2_rotate_requires_path_adjustment(left_path,
|
|
insert_cpos)) {
|
|
|
|
/*
|
|
* We've rotated the tree as much as we
|
|
* should. The rest is up to
|
|
* ocfs2_insert_path() to complete, after the
|
|
* record insertion. We indicate this
|
|
* situation by returning the left path.
|
|
*
|
|
* The reason we don't adjust the records here
|
|
* before the record insert is that an error
|
|
* later might break the rule where a parent
|
|
* record e_cpos will reflect the actual
|
|
* e_cpos of the 1st nonempty record of the
|
|
* child list.
|
|
*/
|
|
*ret_left_path = left_path;
|
|
goto out_ret_path;
|
|
}
|
|
|
|
start = ocfs2_find_subtree_root(inode, left_path, right_path);
|
|
|
|
mlog(0, "Subtree root at index %d (blk %llu, depth %d)\n",
|
|
start,
|
|
(unsigned long long) right_path->p_node[start].bh->b_blocknr,
|
|
right_path->p_tree_depth);
|
|
|
|
ret = ocfs2_extend_rotate_transaction(handle, start,
|
|
orig_credits, right_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_rotate_subtree_right(inode, handle, left_path,
|
|
right_path, start);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (split != SPLIT_NONE &&
|
|
ocfs2_leftmost_rec_contains(path_leaf_el(right_path),
|
|
insert_cpos)) {
|
|
/*
|
|
* A rotate moves the rightmost left leaf
|
|
* record over to the leftmost right leaf
|
|
* slot. If we're doing an extent split
|
|
* instead of a real insert, then we have to
|
|
* check that the extent to be split wasn't
|
|
* just moved over. If it was, then we can
|
|
* exit here, passing left_path back -
|
|
* ocfs2_split_extent() is smart enough to
|
|
* search both leaves.
|
|
*/
|
|
*ret_left_path = left_path;
|
|
goto out_ret_path;
|
|
}
|
|
|
|
/*
|
|
* There is no need to re-read the next right path
|
|
* as we know that it'll be our current left
|
|
* path. Optimize by copying values instead.
|
|
*/
|
|
ocfs2_mv_path(right_path, left_path);
|
|
|
|
ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, right_path,
|
|
&cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
ocfs2_free_path(left_path);
|
|
|
|
out_ret_path:
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_update_edge_lengths(struct inode *inode, handle_t *handle,
|
|
int subtree_index, struct ocfs2_path *path)
|
|
{
|
|
int i, idx, ret;
|
|
struct ocfs2_extent_rec *rec;
|
|
struct ocfs2_extent_list *el;
|
|
struct ocfs2_extent_block *eb;
|
|
u32 range;
|
|
|
|
/*
|
|
* In normal tree rotation process, we will never touch the
|
|
* tree branch above subtree_index and ocfs2_extend_rotate_transaction
|
|
* doesn't reserve the credits for them either.
|
|
*
|
|
* But we do have a special case here which will update the rightmost
|
|
* records for all the bh in the path.
|
|
* So we have to allocate extra credits and access them.
|
|
*/
|
|
ret = ocfs2_extend_trans(handle,
|
|
handle->h_buffer_credits + subtree_index);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_journal_access_path(inode, handle, path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/* Path should always be rightmost. */
|
|
eb = (struct ocfs2_extent_block *)path_leaf_bh(path)->b_data;
|
|
BUG_ON(eb->h_next_leaf_blk != 0ULL);
|
|
|
|
el = &eb->h_list;
|
|
BUG_ON(le16_to_cpu(el->l_next_free_rec) == 0);
|
|
idx = le16_to_cpu(el->l_next_free_rec) - 1;
|
|
rec = &el->l_recs[idx];
|
|
range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
|
|
|
|
for (i = 0; i < path->p_tree_depth; i++) {
|
|
el = path->p_node[i].el;
|
|
idx = le16_to_cpu(el->l_next_free_rec) - 1;
|
|
rec = &el->l_recs[idx];
|
|
|
|
rec->e_int_clusters = cpu_to_le32(range);
|
|
le32_add_cpu(&rec->e_int_clusters, -le32_to_cpu(rec->e_cpos));
|
|
|
|
ocfs2_journal_dirty(handle, path->p_node[i].bh);
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_unlink_path(struct inode *inode, handle_t *handle,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc,
|
|
struct ocfs2_path *path, int unlink_start)
|
|
{
|
|
int ret, i;
|
|
struct ocfs2_extent_block *eb;
|
|
struct ocfs2_extent_list *el;
|
|
struct buffer_head *bh;
|
|
|
|
for(i = unlink_start; i < path_num_items(path); i++) {
|
|
bh = path->p_node[i].bh;
|
|
|
|
eb = (struct ocfs2_extent_block *)bh->b_data;
|
|
/*
|
|
* Not all nodes might have had their final count
|
|
* decremented by the caller - handle this here.
|
|
*/
|
|
el = &eb->h_list;
|
|
if (le16_to_cpu(el->l_next_free_rec) > 1) {
|
|
mlog(ML_ERROR,
|
|
"Inode %llu, attempted to remove extent block "
|
|
"%llu with %u records\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
(unsigned long long)le64_to_cpu(eb->h_blkno),
|
|
le16_to_cpu(el->l_next_free_rec));
|
|
|
|
ocfs2_journal_dirty(handle, bh);
|
|
ocfs2_remove_from_cache(inode, bh);
|
|
continue;
|
|
}
|
|
|
|
el->l_next_free_rec = 0;
|
|
memset(&el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec));
|
|
|
|
ocfs2_journal_dirty(handle, bh);
|
|
|
|
ret = ocfs2_cache_extent_block_free(dealloc, eb);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
ocfs2_remove_from_cache(inode, bh);
|
|
}
|
|
}
|
|
|
|
static void ocfs2_unlink_subtree(struct inode *inode, handle_t *handle,
|
|
struct ocfs2_path *left_path,
|
|
struct ocfs2_path *right_path,
|
|
int subtree_index,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc)
|
|
{
|
|
int i;
|
|
struct buffer_head *root_bh = left_path->p_node[subtree_index].bh;
|
|
struct ocfs2_extent_list *root_el = left_path->p_node[subtree_index].el;
|
|
struct ocfs2_extent_list *el;
|
|
struct ocfs2_extent_block *eb;
|
|
|
|
el = path_leaf_el(left_path);
|
|
|
|
eb = (struct ocfs2_extent_block *)right_path->p_node[subtree_index + 1].bh->b_data;
|
|
|
|
for(i = 1; i < le16_to_cpu(root_el->l_next_free_rec); i++)
|
|
if (root_el->l_recs[i].e_blkno == eb->h_blkno)
|
|
break;
|
|
|
|
BUG_ON(i >= le16_to_cpu(root_el->l_next_free_rec));
|
|
|
|
memset(&root_el->l_recs[i], 0, sizeof(struct ocfs2_extent_rec));
|
|
le16_add_cpu(&root_el->l_next_free_rec, -1);
|
|
|
|
eb = (struct ocfs2_extent_block *)path_leaf_bh(left_path)->b_data;
|
|
eb->h_next_leaf_blk = 0;
|
|
|
|
ocfs2_journal_dirty(handle, root_bh);
|
|
ocfs2_journal_dirty(handle, path_leaf_bh(left_path));
|
|
|
|
ocfs2_unlink_path(inode, handle, dealloc, right_path,
|
|
subtree_index + 1);
|
|
}
|
|
|
|
static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
|
|
struct ocfs2_path *left_path,
|
|
struct ocfs2_path *right_path,
|
|
int subtree_index,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc,
|
|
int *deleted,
|
|
struct ocfs2_extent_tree *et)
|
|
{
|
|
int ret, i, del_right_subtree = 0, right_has_empty = 0;
|
|
struct buffer_head *root_bh, *et_root_bh = path_root_bh(right_path);
|
|
struct ocfs2_extent_list *right_leaf_el, *left_leaf_el;
|
|
struct ocfs2_extent_block *eb;
|
|
|
|
*deleted = 0;
|
|
|
|
right_leaf_el = path_leaf_el(right_path);
|
|
left_leaf_el = path_leaf_el(left_path);
|
|
root_bh = left_path->p_node[subtree_index].bh;
|
|
BUG_ON(root_bh != right_path->p_node[subtree_index].bh);
|
|
|
|
if (!ocfs2_is_empty_extent(&left_leaf_el->l_recs[0]))
|
|
return 0;
|
|
|
|
eb = (struct ocfs2_extent_block *)path_leaf_bh(right_path)->b_data;
|
|
if (ocfs2_is_empty_extent(&right_leaf_el->l_recs[0])) {
|
|
/*
|
|
* It's legal for us to proceed if the right leaf is
|
|
* the rightmost one and it has an empty extent. There
|
|
* are two cases to handle - whether the leaf will be
|
|
* empty after removal or not. If the leaf isn't empty
|
|
* then just remove the empty extent up front. The
|
|
* next block will handle empty leaves by flagging
|
|
* them for unlink.
|
|
*
|
|
* Non rightmost leaves will throw -EAGAIN and the
|
|
* caller can manually move the subtree and retry.
|
|
*/
|
|
|
|
if (eb->h_next_leaf_blk != 0ULL)
|
|
return -EAGAIN;
|
|
|
|
if (le16_to_cpu(right_leaf_el->l_next_free_rec) > 1) {
|
|
ret = ocfs2_journal_access_eb(handle, inode,
|
|
path_leaf_bh(right_path),
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_remove_empty_extent(right_leaf_el);
|
|
} else
|
|
right_has_empty = 1;
|
|
}
|
|
|
|
if (eb->h_next_leaf_blk == 0ULL &&
|
|
le16_to_cpu(right_leaf_el->l_next_free_rec) == 1) {
|
|
/*
|
|
* We have to update i_last_eb_blk during the meta
|
|
* data delete.
|
|
*/
|
|
ret = ocfs2_et_root_journal_access(handle, inode, et,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
del_right_subtree = 1;
|
|
}
|
|
|
|
/*
|
|
* Getting here with an empty extent in the right path implies
|
|
* that it's the rightmost path and will be deleted.
|
|
*/
|
|
BUG_ON(right_has_empty && !del_right_subtree);
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
|
|
subtree_index);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
for(i = subtree_index + 1; i < path_num_items(right_path); i++) {
|
|
ret = ocfs2_path_bh_journal_access(handle, inode,
|
|
right_path, i);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode,
|
|
left_path, i);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (!right_has_empty) {
|
|
/*
|
|
* Only do this if we're moving a real
|
|
* record. Otherwise, the action is delayed until
|
|
* after removal of the right path in which case we
|
|
* can do a simple shift to remove the empty extent.
|
|
*/
|
|
ocfs2_rotate_leaf(left_leaf_el, &right_leaf_el->l_recs[0]);
|
|
memset(&right_leaf_el->l_recs[0], 0,
|
|
sizeof(struct ocfs2_extent_rec));
|
|
}
|
|
if (eb->h_next_leaf_blk == 0ULL) {
|
|
/*
|
|
* Move recs over to get rid of empty extent, decrease
|
|
* next_free. This is allowed to remove the last
|
|
* extent in our leaf (setting l_next_free_rec to
|
|
* zero) - the delete code below won't care.
|
|
*/
|
|
ocfs2_remove_empty_extent(right_leaf_el);
|
|
}
|
|
|
|
ret = ocfs2_journal_dirty(handle, path_leaf_bh(left_path));
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
ret = ocfs2_journal_dirty(handle, path_leaf_bh(right_path));
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
if (del_right_subtree) {
|
|
ocfs2_unlink_subtree(inode, handle, left_path, right_path,
|
|
subtree_index, dealloc);
|
|
ret = ocfs2_update_edge_lengths(inode, handle, subtree_index,
|
|
left_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
eb = (struct ocfs2_extent_block *)path_leaf_bh(left_path)->b_data;
|
|
ocfs2_et_set_last_eb_blk(et, le64_to_cpu(eb->h_blkno));
|
|
|
|
/*
|
|
* Removal of the extent in the left leaf was skipped
|
|
* above so we could delete the right path
|
|
* 1st.
|
|
*/
|
|
if (right_has_empty)
|
|
ocfs2_remove_empty_extent(left_leaf_el);
|
|
|
|
ret = ocfs2_journal_dirty(handle, et_root_bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
*deleted = 1;
|
|
} else
|
|
ocfs2_complete_edge_insert(inode, handle, left_path, right_path,
|
|
subtree_index);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Given a full path, determine what cpos value would return us a path
|
|
* containing the leaf immediately to the right of the current one.
|
|
*
|
|
* Will return zero if the path passed in is already the rightmost path.
|
|
*
|
|
* This looks similar, but is subtly different to
|
|
* ocfs2_find_cpos_for_left_leaf().
|
|
*/
|
|
static int ocfs2_find_cpos_for_right_leaf(struct super_block *sb,
|
|
struct ocfs2_path *path, u32 *cpos)
|
|
{
|
|
int i, j, ret = 0;
|
|
u64 blkno;
|
|
struct ocfs2_extent_list *el;
|
|
|
|
*cpos = 0;
|
|
|
|
if (path->p_tree_depth == 0)
|
|
return 0;
|
|
|
|
blkno = path_leaf_bh(path)->b_blocknr;
|
|
|
|
/* Start at the tree node just above the leaf and work our way up. */
|
|
i = path->p_tree_depth - 1;
|
|
while (i >= 0) {
|
|
int next_free;
|
|
|
|
el = path->p_node[i].el;
|
|
|
|
/*
|
|
* Find the extent record just after the one in our
|
|
* path.
|
|
*/
|
|
next_free = le16_to_cpu(el->l_next_free_rec);
|
|
for(j = 0; j < le16_to_cpu(el->l_next_free_rec); j++) {
|
|
if (le64_to_cpu(el->l_recs[j].e_blkno) == blkno) {
|
|
if (j == (next_free - 1)) {
|
|
if (i == 0) {
|
|
/*
|
|
* We've determined that the
|
|
* path specified is already
|
|
* the rightmost one - return a
|
|
* cpos of zero.
|
|
*/
|
|
goto out;
|
|
}
|
|
/*
|
|
* The rightmost record points to our
|
|
* leaf - we need to travel up the
|
|
* tree one level.
|
|
*/
|
|
goto next_node;
|
|
}
|
|
|
|
*cpos = le32_to_cpu(el->l_recs[j + 1].e_cpos);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we got here, we never found a valid node where
|
|
* the tree indicated one should be.
|
|
*/
|
|
ocfs2_error(sb,
|
|
"Invalid extent tree at extent block %llu\n",
|
|
(unsigned long long)blkno);
|
|
ret = -EROFS;
|
|
goto out;
|
|
|
|
next_node:
|
|
blkno = path->p_node[i].bh->b_blocknr;
|
|
i--;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_rotate_rightmost_leaf_left(struct inode *inode,
|
|
handle_t *handle,
|
|
struct ocfs2_path *path)
|
|
{
|
|
int ret;
|
|
struct buffer_head *bh = path_leaf_bh(path);
|
|
struct ocfs2_extent_list *el = path_leaf_el(path);
|
|
|
|
if (!ocfs2_is_empty_extent(&el->l_recs[0]))
|
|
return 0;
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode, path,
|
|
path_num_items(path) - 1);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_remove_empty_extent(el);
|
|
|
|
ret = ocfs2_journal_dirty(handle, bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int __ocfs2_rotate_tree_left(struct inode *inode,
|
|
handle_t *handle, int orig_credits,
|
|
struct ocfs2_path *path,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc,
|
|
struct ocfs2_path **empty_extent_path,
|
|
struct ocfs2_extent_tree *et)
|
|
{
|
|
int ret, subtree_root, deleted;
|
|
u32 right_cpos;
|
|
struct ocfs2_path *left_path = NULL;
|
|
struct ocfs2_path *right_path = NULL;
|
|
|
|
BUG_ON(!ocfs2_is_empty_extent(&(path_leaf_el(path)->l_recs[0])));
|
|
|
|
*empty_extent_path = NULL;
|
|
|
|
ret = ocfs2_find_cpos_for_right_leaf(inode->i_sb, path,
|
|
&right_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
left_path = ocfs2_new_path_from_path(path);
|
|
if (!left_path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_cp_path(left_path, path);
|
|
|
|
right_path = ocfs2_new_path_from_path(path);
|
|
if (!right_path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
while (right_cpos) {
|
|
ret = ocfs2_find_path(inode, right_path, right_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
subtree_root = ocfs2_find_subtree_root(inode, left_path,
|
|
right_path);
|
|
|
|
mlog(0, "Subtree root at index %d (blk %llu, depth %d)\n",
|
|
subtree_root,
|
|
(unsigned long long)
|
|
right_path->p_node[subtree_root].bh->b_blocknr,
|
|
right_path->p_tree_depth);
|
|
|
|
ret = ocfs2_extend_rotate_transaction(handle, subtree_root,
|
|
orig_credits, left_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Caller might still want to make changes to the
|
|
* tree root, so re-add it to the journal here.
|
|
*/
|
|
ret = ocfs2_path_bh_journal_access(handle, inode,
|
|
left_path, 0);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_rotate_subtree_left(inode, handle, left_path,
|
|
right_path, subtree_root,
|
|
dealloc, &deleted, et);
|
|
if (ret == -EAGAIN) {
|
|
/*
|
|
* The rotation has to temporarily stop due to
|
|
* the right subtree having an empty
|
|
* extent. Pass it back to the caller for a
|
|
* fixup.
|
|
*/
|
|
*empty_extent_path = right_path;
|
|
right_path = NULL;
|
|
goto out;
|
|
}
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The subtree rotate might have removed records on
|
|
* the rightmost edge. If so, then rotation is
|
|
* complete.
|
|
*/
|
|
if (deleted)
|
|
break;
|
|
|
|
ocfs2_mv_path(left_path, right_path);
|
|
|
|
ret = ocfs2_find_cpos_for_right_leaf(inode->i_sb, left_path,
|
|
&right_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
ocfs2_free_path(right_path);
|
|
ocfs2_free_path(left_path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_remove_rightmost_path(struct inode *inode, handle_t *handle,
|
|
struct ocfs2_path *path,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc,
|
|
struct ocfs2_extent_tree *et)
|
|
{
|
|
int ret, subtree_index;
|
|
u32 cpos;
|
|
struct ocfs2_path *left_path = NULL;
|
|
struct ocfs2_extent_block *eb;
|
|
struct ocfs2_extent_list *el;
|
|
|
|
|
|
ret = ocfs2_et_sanity_check(inode, et);
|
|
if (ret)
|
|
goto out;
|
|
/*
|
|
* There's two ways we handle this depending on
|
|
* whether path is the only existing one.
|
|
*/
|
|
ret = ocfs2_extend_rotate_transaction(handle, 0,
|
|
handle->h_buffer_credits,
|
|
path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_journal_access_path(inode, handle, path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, path, &cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (cpos) {
|
|
/*
|
|
* We have a path to the left of this one - it needs
|
|
* an update too.
|
|
*/
|
|
left_path = ocfs2_new_path_from_path(path);
|
|
if (!left_path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_path(inode, left_path, cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_journal_access_path(inode, handle, left_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
subtree_index = ocfs2_find_subtree_root(inode, left_path, path);
|
|
|
|
ocfs2_unlink_subtree(inode, handle, left_path, path,
|
|
subtree_index, dealloc);
|
|
ret = ocfs2_update_edge_lengths(inode, handle, subtree_index,
|
|
left_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
eb = (struct ocfs2_extent_block *)path_leaf_bh(left_path)->b_data;
|
|
ocfs2_et_set_last_eb_blk(et, le64_to_cpu(eb->h_blkno));
|
|
} else {
|
|
/*
|
|
* 'path' is also the leftmost path which
|
|
* means it must be the only one. This gets
|
|
* handled differently because we want to
|
|
* revert the inode back to having extents
|
|
* in-line.
|
|
*/
|
|
ocfs2_unlink_path(inode, handle, dealloc, path, 1);
|
|
|
|
el = et->et_root_el;
|
|
el->l_tree_depth = 0;
|
|
el->l_next_free_rec = 0;
|
|
memset(&el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec));
|
|
|
|
ocfs2_et_set_last_eb_blk(et, 0);
|
|
}
|
|
|
|
ocfs2_journal_dirty(handle, path_root_bh(path));
|
|
|
|
out:
|
|
ocfs2_free_path(left_path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Left rotation of btree records.
|
|
*
|
|
* In many ways, this is (unsurprisingly) the opposite of right
|
|
* rotation. We start at some non-rightmost path containing an empty
|
|
* extent in the leaf block. The code works its way to the rightmost
|
|
* path by rotating records to the left in every subtree.
|
|
*
|
|
* This is used by any code which reduces the number of extent records
|
|
* in a leaf. After removal, an empty record should be placed in the
|
|
* leftmost list position.
|
|
*
|
|
* This won't handle a length update of the rightmost path records if
|
|
* the rightmost tree leaf record is removed so the caller is
|
|
* responsible for detecting and correcting that.
|
|
*/
|
|
static int ocfs2_rotate_tree_left(struct inode *inode, handle_t *handle,
|
|
struct ocfs2_path *path,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc,
|
|
struct ocfs2_extent_tree *et)
|
|
{
|
|
int ret, orig_credits = handle->h_buffer_credits;
|
|
struct ocfs2_path *tmp_path = NULL, *restart_path = NULL;
|
|
struct ocfs2_extent_block *eb;
|
|
struct ocfs2_extent_list *el;
|
|
|
|
el = path_leaf_el(path);
|
|
if (!ocfs2_is_empty_extent(&el->l_recs[0]))
|
|
return 0;
|
|
|
|
if (path->p_tree_depth == 0) {
|
|
rightmost_no_delete:
|
|
/*
|
|
* Inline extents. This is trivially handled, so do
|
|
* it up front.
|
|
*/
|
|
ret = ocfs2_rotate_rightmost_leaf_left(inode, handle,
|
|
path);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Handle rightmost branch now. There's several cases:
|
|
* 1) simple rotation leaving records in there. That's trivial.
|
|
* 2) rotation requiring a branch delete - there's no more
|
|
* records left. Two cases of this:
|
|
* a) There are branches to the left.
|
|
* b) This is also the leftmost (the only) branch.
|
|
*
|
|
* 1) is handled via ocfs2_rotate_rightmost_leaf_left()
|
|
* 2a) we need the left branch so that we can update it with the unlink
|
|
* 2b) we need to bring the inode back to inline extents.
|
|
*/
|
|
|
|
eb = (struct ocfs2_extent_block *)path_leaf_bh(path)->b_data;
|
|
el = &eb->h_list;
|
|
if (eb->h_next_leaf_blk == 0) {
|
|
/*
|
|
* This gets a bit tricky if we're going to delete the
|
|
* rightmost path. Get the other cases out of the way
|
|
* 1st.
|
|
*/
|
|
if (le16_to_cpu(el->l_next_free_rec) > 1)
|
|
goto rightmost_no_delete;
|
|
|
|
if (le16_to_cpu(el->l_next_free_rec) == 0) {
|
|
ret = -EIO;
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu has empty extent block at %llu",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
(unsigned long long)le64_to_cpu(eb->h_blkno));
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* XXX: The caller can not trust "path" any more after
|
|
* this as it will have been deleted. What do we do?
|
|
*
|
|
* In theory the rotate-for-merge code will never get
|
|
* here because it'll always ask for a rotate in a
|
|
* nonempty list.
|
|
*/
|
|
|
|
ret = ocfs2_remove_rightmost_path(inode, handle, path,
|
|
dealloc, et);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Now we can loop, remembering the path we get from -EAGAIN
|
|
* and restarting from there.
|
|
*/
|
|
try_rotate:
|
|
ret = __ocfs2_rotate_tree_left(inode, handle, orig_credits, path,
|
|
dealloc, &restart_path, et);
|
|
if (ret && ret != -EAGAIN) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
while (ret == -EAGAIN) {
|
|
tmp_path = restart_path;
|
|
restart_path = NULL;
|
|
|
|
ret = __ocfs2_rotate_tree_left(inode, handle, orig_credits,
|
|
tmp_path, dealloc,
|
|
&restart_path, et);
|
|
if (ret && ret != -EAGAIN) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_free_path(tmp_path);
|
|
tmp_path = NULL;
|
|
|
|
if (ret == 0)
|
|
goto try_rotate;
|
|
}
|
|
|
|
out:
|
|
ocfs2_free_path(tmp_path);
|
|
ocfs2_free_path(restart_path);
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_cleanup_merge(struct ocfs2_extent_list *el,
|
|
int index)
|
|
{
|
|
struct ocfs2_extent_rec *rec = &el->l_recs[index];
|
|
unsigned int size;
|
|
|
|
if (rec->e_leaf_clusters == 0) {
|
|
/*
|
|
* We consumed all of the merged-from record. An empty
|
|
* extent cannot exist anywhere but the 1st array
|
|
* position, so move things over if the merged-from
|
|
* record doesn't occupy that position.
|
|
*
|
|
* This creates a new empty extent so the caller
|
|
* should be smart enough to have removed any existing
|
|
* ones.
|
|
*/
|
|
if (index > 0) {
|
|
BUG_ON(ocfs2_is_empty_extent(&el->l_recs[0]));
|
|
size = index * sizeof(struct ocfs2_extent_rec);
|
|
memmove(&el->l_recs[1], &el->l_recs[0], size);
|
|
}
|
|
|
|
/*
|
|
* Always memset - the caller doesn't check whether it
|
|
* created an empty extent, so there could be junk in
|
|
* the other fields.
|
|
*/
|
|
memset(&el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec));
|
|
}
|
|
}
|
|
|
|
static int ocfs2_get_right_path(struct inode *inode,
|
|
struct ocfs2_path *left_path,
|
|
struct ocfs2_path **ret_right_path)
|
|
{
|
|
int ret;
|
|
u32 right_cpos;
|
|
struct ocfs2_path *right_path = NULL;
|
|
struct ocfs2_extent_list *left_el;
|
|
|
|
*ret_right_path = NULL;
|
|
|
|
/* This function shouldn't be called for non-trees. */
|
|
BUG_ON(left_path->p_tree_depth == 0);
|
|
|
|
left_el = path_leaf_el(left_path);
|
|
BUG_ON(left_el->l_next_free_rec != left_el->l_count);
|
|
|
|
ret = ocfs2_find_cpos_for_right_leaf(inode->i_sb, left_path,
|
|
&right_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/* This function shouldn't be called for the rightmost leaf. */
|
|
BUG_ON(right_cpos == 0);
|
|
|
|
right_path = ocfs2_new_path_from_path(left_path);
|
|
if (!right_path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_path(inode, right_path, right_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
*ret_right_path = right_path;
|
|
out:
|
|
if (ret)
|
|
ocfs2_free_path(right_path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove split_rec clusters from the record at index and merge them
|
|
* onto the beginning of the record "next" to it.
|
|
* For index < l_count - 1, the next means the extent rec at index + 1.
|
|
* For index == l_count - 1, the "next" means the 1st extent rec of the
|
|
* next extent block.
|
|
*/
|
|
static int ocfs2_merge_rec_right(struct inode *inode,
|
|
struct ocfs2_path *left_path,
|
|
handle_t *handle,
|
|
struct ocfs2_extent_rec *split_rec,
|
|
int index)
|
|
{
|
|
int ret, next_free, i;
|
|
unsigned int split_clusters = le16_to_cpu(split_rec->e_leaf_clusters);
|
|
struct ocfs2_extent_rec *left_rec;
|
|
struct ocfs2_extent_rec *right_rec;
|
|
struct ocfs2_extent_list *right_el;
|
|
struct ocfs2_path *right_path = NULL;
|
|
int subtree_index = 0;
|
|
struct ocfs2_extent_list *el = path_leaf_el(left_path);
|
|
struct buffer_head *bh = path_leaf_bh(left_path);
|
|
struct buffer_head *root_bh = NULL;
|
|
|
|
BUG_ON(index >= le16_to_cpu(el->l_next_free_rec));
|
|
left_rec = &el->l_recs[index];
|
|
|
|
if (index == le16_to_cpu(el->l_next_free_rec) - 1 &&
|
|
le16_to_cpu(el->l_next_free_rec) == le16_to_cpu(el->l_count)) {
|
|
/* we meet with a cross extent block merge. */
|
|
ret = ocfs2_get_right_path(inode, left_path, &right_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
right_el = path_leaf_el(right_path);
|
|
next_free = le16_to_cpu(right_el->l_next_free_rec);
|
|
BUG_ON(next_free <= 0);
|
|
right_rec = &right_el->l_recs[0];
|
|
if (ocfs2_is_empty_extent(right_rec)) {
|
|
BUG_ON(next_free <= 1);
|
|
right_rec = &right_el->l_recs[1];
|
|
}
|
|
|
|
BUG_ON(le32_to_cpu(left_rec->e_cpos) +
|
|
le16_to_cpu(left_rec->e_leaf_clusters) !=
|
|
le32_to_cpu(right_rec->e_cpos));
|
|
|
|
subtree_index = ocfs2_find_subtree_root(inode,
|
|
left_path, right_path);
|
|
|
|
ret = ocfs2_extend_rotate_transaction(handle, subtree_index,
|
|
handle->h_buffer_credits,
|
|
right_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
root_bh = left_path->p_node[subtree_index].bh;
|
|
BUG_ON(root_bh != right_path->p_node[subtree_index].bh);
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
|
|
subtree_index);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
for (i = subtree_index + 1;
|
|
i < path_num_items(right_path); i++) {
|
|
ret = ocfs2_path_bh_journal_access(handle, inode,
|
|
right_path, i);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode,
|
|
left_path, i);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
} else {
|
|
BUG_ON(index == le16_to_cpu(el->l_next_free_rec) - 1);
|
|
right_rec = &el->l_recs[index + 1];
|
|
}
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode, left_path,
|
|
path_num_items(left_path) - 1);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
le16_add_cpu(&left_rec->e_leaf_clusters, -split_clusters);
|
|
|
|
le32_add_cpu(&right_rec->e_cpos, -split_clusters);
|
|
le64_add_cpu(&right_rec->e_blkno,
|
|
-ocfs2_clusters_to_blocks(inode->i_sb, split_clusters));
|
|
le16_add_cpu(&right_rec->e_leaf_clusters, split_clusters);
|
|
|
|
ocfs2_cleanup_merge(el, index);
|
|
|
|
ret = ocfs2_journal_dirty(handle, bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
if (right_path) {
|
|
ret = ocfs2_journal_dirty(handle, path_leaf_bh(right_path));
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
ocfs2_complete_edge_insert(inode, handle, left_path,
|
|
right_path, subtree_index);
|
|
}
|
|
out:
|
|
if (right_path)
|
|
ocfs2_free_path(right_path);
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_get_left_path(struct inode *inode,
|
|
struct ocfs2_path *right_path,
|
|
struct ocfs2_path **ret_left_path)
|
|
{
|
|
int ret;
|
|
u32 left_cpos;
|
|
struct ocfs2_path *left_path = NULL;
|
|
|
|
*ret_left_path = NULL;
|
|
|
|
/* This function shouldn't be called for non-trees. */
|
|
BUG_ON(right_path->p_tree_depth == 0);
|
|
|
|
ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
|
|
right_path, &left_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/* This function shouldn't be called for the leftmost leaf. */
|
|
BUG_ON(left_cpos == 0);
|
|
|
|
left_path = ocfs2_new_path_from_path(right_path);
|
|
if (!left_path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_path(inode, left_path, left_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
*ret_left_path = left_path;
|
|
out:
|
|
if (ret)
|
|
ocfs2_free_path(left_path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove split_rec clusters from the record at index and merge them
|
|
* onto the tail of the record "before" it.
|
|
* For index > 0, the "before" means the extent rec at index - 1.
|
|
*
|
|
* For index == 0, the "before" means the last record of the previous
|
|
* extent block. And there is also a situation that we may need to
|
|
* remove the rightmost leaf extent block in the right_path and change
|
|
* the right path to indicate the new rightmost path.
|
|
*/
|
|
static int ocfs2_merge_rec_left(struct inode *inode,
|
|
struct ocfs2_path *right_path,
|
|
handle_t *handle,
|
|
struct ocfs2_extent_rec *split_rec,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc,
|
|
struct ocfs2_extent_tree *et,
|
|
int index)
|
|
{
|
|
int ret, i, subtree_index = 0, has_empty_extent = 0;
|
|
unsigned int split_clusters = le16_to_cpu(split_rec->e_leaf_clusters);
|
|
struct ocfs2_extent_rec *left_rec;
|
|
struct ocfs2_extent_rec *right_rec;
|
|
struct ocfs2_extent_list *el = path_leaf_el(right_path);
|
|
struct buffer_head *bh = path_leaf_bh(right_path);
|
|
struct buffer_head *root_bh = NULL;
|
|
struct ocfs2_path *left_path = NULL;
|
|
struct ocfs2_extent_list *left_el;
|
|
|
|
BUG_ON(index < 0);
|
|
|
|
right_rec = &el->l_recs[index];
|
|
if (index == 0) {
|
|
/* we meet with a cross extent block merge. */
|
|
ret = ocfs2_get_left_path(inode, right_path, &left_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
left_el = path_leaf_el(left_path);
|
|
BUG_ON(le16_to_cpu(left_el->l_next_free_rec) !=
|
|
le16_to_cpu(left_el->l_count));
|
|
|
|
left_rec = &left_el->l_recs[
|
|
le16_to_cpu(left_el->l_next_free_rec) - 1];
|
|
BUG_ON(le32_to_cpu(left_rec->e_cpos) +
|
|
le16_to_cpu(left_rec->e_leaf_clusters) !=
|
|
le32_to_cpu(split_rec->e_cpos));
|
|
|
|
subtree_index = ocfs2_find_subtree_root(inode,
|
|
left_path, right_path);
|
|
|
|
ret = ocfs2_extend_rotate_transaction(handle, subtree_index,
|
|
handle->h_buffer_credits,
|
|
left_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
root_bh = left_path->p_node[subtree_index].bh;
|
|
BUG_ON(root_bh != right_path->p_node[subtree_index].bh);
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
|
|
subtree_index);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
for (i = subtree_index + 1;
|
|
i < path_num_items(right_path); i++) {
|
|
ret = ocfs2_path_bh_journal_access(handle, inode,
|
|
right_path, i);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode,
|
|
left_path, i);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
} else {
|
|
left_rec = &el->l_recs[index - 1];
|
|
if (ocfs2_is_empty_extent(&el->l_recs[0]))
|
|
has_empty_extent = 1;
|
|
}
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
|
|
path_num_items(right_path) - 1);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (has_empty_extent && index == 1) {
|
|
/*
|
|
* The easy case - we can just plop the record right in.
|
|
*/
|
|
*left_rec = *split_rec;
|
|
|
|
has_empty_extent = 0;
|
|
} else
|
|
le16_add_cpu(&left_rec->e_leaf_clusters, split_clusters);
|
|
|
|
le32_add_cpu(&right_rec->e_cpos, split_clusters);
|
|
le64_add_cpu(&right_rec->e_blkno,
|
|
ocfs2_clusters_to_blocks(inode->i_sb, split_clusters));
|
|
le16_add_cpu(&right_rec->e_leaf_clusters, -split_clusters);
|
|
|
|
ocfs2_cleanup_merge(el, index);
|
|
|
|
ret = ocfs2_journal_dirty(handle, bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
if (left_path) {
|
|
ret = ocfs2_journal_dirty(handle, path_leaf_bh(left_path));
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
/*
|
|
* In the situation that the right_rec is empty and the extent
|
|
* block is empty also, ocfs2_complete_edge_insert can't handle
|
|
* it and we need to delete the right extent block.
|
|
*/
|
|
if (le16_to_cpu(right_rec->e_leaf_clusters) == 0 &&
|
|
le16_to_cpu(el->l_next_free_rec) == 1) {
|
|
|
|
ret = ocfs2_remove_rightmost_path(inode, handle,
|
|
right_path,
|
|
dealloc, et);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/* Now the rightmost extent block has been deleted.
|
|
* So we use the new rightmost path.
|
|
*/
|
|
ocfs2_mv_path(right_path, left_path);
|
|
left_path = NULL;
|
|
} else
|
|
ocfs2_complete_edge_insert(inode, handle, left_path,
|
|
right_path, subtree_index);
|
|
}
|
|
out:
|
|
if (left_path)
|
|
ocfs2_free_path(left_path);
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_try_to_merge_extent(struct inode *inode,
|
|
handle_t *handle,
|
|
struct ocfs2_path *path,
|
|
int split_index,
|
|
struct ocfs2_extent_rec *split_rec,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc,
|
|
struct ocfs2_merge_ctxt *ctxt,
|
|
struct ocfs2_extent_tree *et)
|
|
|
|
{
|
|
int ret = 0;
|
|
struct ocfs2_extent_list *el = path_leaf_el(path);
|
|
struct ocfs2_extent_rec *rec = &el->l_recs[split_index];
|
|
|
|
BUG_ON(ctxt->c_contig_type == CONTIG_NONE);
|
|
|
|
if (ctxt->c_split_covers_rec && ctxt->c_has_empty_extent) {
|
|
/*
|
|
* The merge code will need to create an empty
|
|
* extent to take the place of the newly
|
|
* emptied slot. Remove any pre-existing empty
|
|
* extents - having more than one in a leaf is
|
|
* illegal.
|
|
*/
|
|
ret = ocfs2_rotate_tree_left(inode, handle, path,
|
|
dealloc, et);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
split_index--;
|
|
rec = &el->l_recs[split_index];
|
|
}
|
|
|
|
if (ctxt->c_contig_type == CONTIG_LEFTRIGHT) {
|
|
/*
|
|
* Left-right contig implies this.
|
|
*/
|
|
BUG_ON(!ctxt->c_split_covers_rec);
|
|
|
|
/*
|
|
* Since the leftright insert always covers the entire
|
|
* extent, this call will delete the insert record
|
|
* entirely, resulting in an empty extent record added to
|
|
* the extent block.
|
|
*
|
|
* Since the adding of an empty extent shifts
|
|
* everything back to the right, there's no need to
|
|
* update split_index here.
|
|
*
|
|
* When the split_index is zero, we need to merge it to the
|
|
* prevoius extent block. It is more efficient and easier
|
|
* if we do merge_right first and merge_left later.
|
|
*/
|
|
ret = ocfs2_merge_rec_right(inode, path,
|
|
handle, split_rec,
|
|
split_index);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We can only get this from logic error above.
|
|
*/
|
|
BUG_ON(!ocfs2_is_empty_extent(&el->l_recs[0]));
|
|
|
|
/* The merge left us with an empty extent, remove it. */
|
|
ret = ocfs2_rotate_tree_left(inode, handle, path,
|
|
dealloc, et);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
rec = &el->l_recs[split_index];
|
|
|
|
/*
|
|
* Note that we don't pass split_rec here on purpose -
|
|
* we've merged it into the rec already.
|
|
*/
|
|
ret = ocfs2_merge_rec_left(inode, path,
|
|
handle, rec,
|
|
dealloc, et,
|
|
split_index);
|
|
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_rotate_tree_left(inode, handle, path,
|
|
dealloc, et);
|
|
/*
|
|
* Error from this last rotate is not critical, so
|
|
* print but don't bubble it up.
|
|
*/
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
ret = 0;
|
|
} else {
|
|
/*
|
|
* Merge a record to the left or right.
|
|
*
|
|
* 'contig_type' is relative to the existing record,
|
|
* so for example, if we're "right contig", it's to
|
|
* the record on the left (hence the left merge).
|
|
*/
|
|
if (ctxt->c_contig_type == CONTIG_RIGHT) {
|
|
ret = ocfs2_merge_rec_left(inode,
|
|
path,
|
|
handle, split_rec,
|
|
dealloc, et,
|
|
split_index);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
} else {
|
|
ret = ocfs2_merge_rec_right(inode,
|
|
path,
|
|
handle, split_rec,
|
|
split_index);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (ctxt->c_split_covers_rec) {
|
|
/*
|
|
* The merge may have left an empty extent in
|
|
* our leaf. Try to rotate it away.
|
|
*/
|
|
ret = ocfs2_rotate_tree_left(inode, handle, path,
|
|
dealloc, et);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
ret = 0;
|
|
}
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_subtract_from_rec(struct super_block *sb,
|
|
enum ocfs2_split_type split,
|
|
struct ocfs2_extent_rec *rec,
|
|
struct ocfs2_extent_rec *split_rec)
|
|
{
|
|
u64 len_blocks;
|
|
|
|
len_blocks = ocfs2_clusters_to_blocks(sb,
|
|
le16_to_cpu(split_rec->e_leaf_clusters));
|
|
|
|
if (split == SPLIT_LEFT) {
|
|
/*
|
|
* Region is on the left edge of the existing
|
|
* record.
|
|
*/
|
|
le32_add_cpu(&rec->e_cpos,
|
|
le16_to_cpu(split_rec->e_leaf_clusters));
|
|
le64_add_cpu(&rec->e_blkno, len_blocks);
|
|
le16_add_cpu(&rec->e_leaf_clusters,
|
|
-le16_to_cpu(split_rec->e_leaf_clusters));
|
|
} else {
|
|
/*
|
|
* Region is on the right edge of the existing
|
|
* record.
|
|
*/
|
|
le16_add_cpu(&rec->e_leaf_clusters,
|
|
-le16_to_cpu(split_rec->e_leaf_clusters));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Do the final bits of extent record insertion at the target leaf
|
|
* list. If this leaf is part of an allocation tree, it is assumed
|
|
* that the tree above has been prepared.
|
|
*/
|
|
static void ocfs2_insert_at_leaf(struct ocfs2_extent_rec *insert_rec,
|
|
struct ocfs2_extent_list *el,
|
|
struct ocfs2_insert_type *insert,
|
|
struct inode *inode)
|
|
{
|
|
int i = insert->ins_contig_index;
|
|
unsigned int range;
|
|
struct ocfs2_extent_rec *rec;
|
|
|
|
BUG_ON(le16_to_cpu(el->l_tree_depth) != 0);
|
|
|
|
if (insert->ins_split != SPLIT_NONE) {
|
|
i = ocfs2_search_extent_list(el, le32_to_cpu(insert_rec->e_cpos));
|
|
BUG_ON(i == -1);
|
|
rec = &el->l_recs[i];
|
|
ocfs2_subtract_from_rec(inode->i_sb, insert->ins_split, rec,
|
|
insert_rec);
|
|
goto rotate;
|
|
}
|
|
|
|
/*
|
|
* Contiguous insert - either left or right.
|
|
*/
|
|
if (insert->ins_contig != CONTIG_NONE) {
|
|
rec = &el->l_recs[i];
|
|
if (insert->ins_contig == CONTIG_LEFT) {
|
|
rec->e_blkno = insert_rec->e_blkno;
|
|
rec->e_cpos = insert_rec->e_cpos;
|
|
}
|
|
le16_add_cpu(&rec->e_leaf_clusters,
|
|
le16_to_cpu(insert_rec->e_leaf_clusters));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Handle insert into an empty leaf.
|
|
*/
|
|
if (le16_to_cpu(el->l_next_free_rec) == 0 ||
|
|
((le16_to_cpu(el->l_next_free_rec) == 1) &&
|
|
ocfs2_is_empty_extent(&el->l_recs[0]))) {
|
|
el->l_recs[0] = *insert_rec;
|
|
el->l_next_free_rec = cpu_to_le16(1);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Appending insert.
|
|
*/
|
|
if (insert->ins_appending == APPEND_TAIL) {
|
|
i = le16_to_cpu(el->l_next_free_rec) - 1;
|
|
rec = &el->l_recs[i];
|
|
range = le32_to_cpu(rec->e_cpos)
|
|
+ le16_to_cpu(rec->e_leaf_clusters);
|
|
BUG_ON(le32_to_cpu(insert_rec->e_cpos) < range);
|
|
|
|
mlog_bug_on_msg(le16_to_cpu(el->l_next_free_rec) >=
|
|
le16_to_cpu(el->l_count),
|
|
"inode %lu, depth %u, count %u, next free %u, "
|
|
"rec.cpos %u, rec.clusters %u, "
|
|
"insert.cpos %u, insert.clusters %u\n",
|
|
inode->i_ino,
|
|
le16_to_cpu(el->l_tree_depth),
|
|
le16_to_cpu(el->l_count),
|
|
le16_to_cpu(el->l_next_free_rec),
|
|
le32_to_cpu(el->l_recs[i].e_cpos),
|
|
le16_to_cpu(el->l_recs[i].e_leaf_clusters),
|
|
le32_to_cpu(insert_rec->e_cpos),
|
|
le16_to_cpu(insert_rec->e_leaf_clusters));
|
|
i++;
|
|
el->l_recs[i] = *insert_rec;
|
|
le16_add_cpu(&el->l_next_free_rec, 1);
|
|
return;
|
|
}
|
|
|
|
rotate:
|
|
/*
|
|
* Ok, we have to rotate.
|
|
*
|
|
* At this point, it is safe to assume that inserting into an
|
|
* empty leaf and appending to a leaf have both been handled
|
|
* above.
|
|
*
|
|
* This leaf needs to have space, either by the empty 1st
|
|
* extent record, or by virtue of an l_next_rec < l_count.
|
|
*/
|
|
ocfs2_rotate_leaf(el, insert_rec);
|
|
}
|
|
|
|
static void ocfs2_adjust_rightmost_records(struct inode *inode,
|
|
handle_t *handle,
|
|
struct ocfs2_path *path,
|
|
struct ocfs2_extent_rec *insert_rec)
|
|
{
|
|
int ret, i, next_free;
|
|
struct buffer_head *bh;
|
|
struct ocfs2_extent_list *el;
|
|
struct ocfs2_extent_rec *rec;
|
|
|
|
/*
|
|
* Update everything except the leaf block.
|
|
*/
|
|
for (i = 0; i < path->p_tree_depth; i++) {
|
|
bh = path->p_node[i].bh;
|
|
el = path->p_node[i].el;
|
|
|
|
next_free = le16_to_cpu(el->l_next_free_rec);
|
|
if (next_free == 0) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Dinode %llu has a bad extent list",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
ret = -EIO;
|
|
return;
|
|
}
|
|
|
|
rec = &el->l_recs[next_free - 1];
|
|
|
|
rec->e_int_clusters = insert_rec->e_cpos;
|
|
le32_add_cpu(&rec->e_int_clusters,
|
|
le16_to_cpu(insert_rec->e_leaf_clusters));
|
|
le32_add_cpu(&rec->e_int_clusters,
|
|
-le32_to_cpu(rec->e_cpos));
|
|
|
|
ret = ocfs2_journal_dirty(handle, bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
}
|
|
}
|
|
|
|
static int ocfs2_append_rec_to_path(struct inode *inode, handle_t *handle,
|
|
struct ocfs2_extent_rec *insert_rec,
|
|
struct ocfs2_path *right_path,
|
|
struct ocfs2_path **ret_left_path)
|
|
{
|
|
int ret, next_free;
|
|
struct ocfs2_extent_list *el;
|
|
struct ocfs2_path *left_path = NULL;
|
|
|
|
*ret_left_path = NULL;
|
|
|
|
/*
|
|
* This shouldn't happen for non-trees. The extent rec cluster
|
|
* count manipulation below only works for interior nodes.
|
|
*/
|
|
BUG_ON(right_path->p_tree_depth == 0);
|
|
|
|
/*
|
|
* If our appending insert is at the leftmost edge of a leaf,
|
|
* then we might need to update the rightmost records of the
|
|
* neighboring path.
|
|
*/
|
|
el = path_leaf_el(right_path);
|
|
next_free = le16_to_cpu(el->l_next_free_rec);
|
|
if (next_free == 0 ||
|
|
(next_free == 1 && ocfs2_is_empty_extent(&el->l_recs[0]))) {
|
|
u32 left_cpos;
|
|
|
|
ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, right_path,
|
|
&left_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
mlog(0, "Append may need a left path update. cpos: %u, "
|
|
"left_cpos: %u\n", le32_to_cpu(insert_rec->e_cpos),
|
|
left_cpos);
|
|
|
|
/*
|
|
* No need to worry if the append is already in the
|
|
* leftmost leaf.
|
|
*/
|
|
if (left_cpos) {
|
|
left_path = ocfs2_new_path_from_path(right_path);
|
|
if (!left_path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_path(inode, left_path, left_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* ocfs2_insert_path() will pass the left_path to the
|
|
* journal for us.
|
|
*/
|
|
}
|
|
}
|
|
|
|
ret = ocfs2_journal_access_path(inode, handle, right_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_adjust_rightmost_records(inode, handle, right_path, insert_rec);
|
|
|
|
*ret_left_path = left_path;
|
|
ret = 0;
|
|
out:
|
|
if (ret != 0)
|
|
ocfs2_free_path(left_path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_split_record(struct inode *inode,
|
|
struct ocfs2_path *left_path,
|
|
struct ocfs2_path *right_path,
|
|
struct ocfs2_extent_rec *split_rec,
|
|
enum ocfs2_split_type split)
|
|
{
|
|
int index;
|
|
u32 cpos = le32_to_cpu(split_rec->e_cpos);
|
|
struct ocfs2_extent_list *left_el = NULL, *right_el, *insert_el, *el;
|
|
struct ocfs2_extent_rec *rec, *tmprec;
|
|
|
|
right_el = path_leaf_el(right_path);
|
|
if (left_path)
|
|
left_el = path_leaf_el(left_path);
|
|
|
|
el = right_el;
|
|
insert_el = right_el;
|
|
index = ocfs2_search_extent_list(el, cpos);
|
|
if (index != -1) {
|
|
if (index == 0 && left_path) {
|
|
BUG_ON(ocfs2_is_empty_extent(&el->l_recs[0]));
|
|
|
|
/*
|
|
* This typically means that the record
|
|
* started in the left path but moved to the
|
|
* right as a result of rotation. We either
|
|
* move the existing record to the left, or we
|
|
* do the later insert there.
|
|
*
|
|
* In this case, the left path should always
|
|
* exist as the rotate code will have passed
|
|
* it back for a post-insert update.
|
|
*/
|
|
|
|
if (split == SPLIT_LEFT) {
|
|
/*
|
|
* It's a left split. Since we know
|
|
* that the rotate code gave us an
|
|
* empty extent in the left path, we
|
|
* can just do the insert there.
|
|
*/
|
|
insert_el = left_el;
|
|
} else {
|
|
/*
|
|
* Right split - we have to move the
|
|
* existing record over to the left
|
|
* leaf. The insert will be into the
|
|
* newly created empty extent in the
|
|
* right leaf.
|
|
*/
|
|
tmprec = &right_el->l_recs[index];
|
|
ocfs2_rotate_leaf(left_el, tmprec);
|
|
el = left_el;
|
|
|
|
memset(tmprec, 0, sizeof(*tmprec));
|
|
index = ocfs2_search_extent_list(left_el, cpos);
|
|
BUG_ON(index == -1);
|
|
}
|
|
}
|
|
} else {
|
|
BUG_ON(!left_path);
|
|
BUG_ON(!ocfs2_is_empty_extent(&left_el->l_recs[0]));
|
|
/*
|
|
* Left path is easy - we can just allow the insert to
|
|
* happen.
|
|
*/
|
|
el = left_el;
|
|
insert_el = left_el;
|
|
index = ocfs2_search_extent_list(el, cpos);
|
|
BUG_ON(index == -1);
|
|
}
|
|
|
|
rec = &el->l_recs[index];
|
|
ocfs2_subtract_from_rec(inode->i_sb, split, rec, split_rec);
|
|
ocfs2_rotate_leaf(insert_el, split_rec);
|
|
}
|
|
|
|
/*
|
|
* This function only does inserts on an allocation b-tree. For tree
|
|
* depth = 0, ocfs2_insert_at_leaf() is called directly.
|
|
*
|
|
* right_path is the path we want to do the actual insert
|
|
* in. left_path should only be passed in if we need to update that
|
|
* portion of the tree after an edge insert.
|
|
*/
|
|
static int ocfs2_insert_path(struct inode *inode,
|
|
handle_t *handle,
|
|
struct ocfs2_path *left_path,
|
|
struct ocfs2_path *right_path,
|
|
struct ocfs2_extent_rec *insert_rec,
|
|
struct ocfs2_insert_type *insert)
|
|
{
|
|
int ret, subtree_index;
|
|
struct buffer_head *leaf_bh = path_leaf_bh(right_path);
|
|
|
|
if (left_path) {
|
|
int credits = handle->h_buffer_credits;
|
|
|
|
/*
|
|
* There's a chance that left_path got passed back to
|
|
* us without being accounted for in the
|
|
* journal. Extend our transaction here to be sure we
|
|
* can change those blocks.
|
|
*/
|
|
credits += left_path->p_tree_depth;
|
|
|
|
ret = ocfs2_extend_trans(handle, credits);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_journal_access_path(inode, handle, left_path);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Pass both paths to the journal. The majority of inserts
|
|
* will be touching all components anyway.
|
|
*/
|
|
ret = ocfs2_journal_access_path(inode, handle, right_path);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (insert->ins_split != SPLIT_NONE) {
|
|
/*
|
|
* We could call ocfs2_insert_at_leaf() for some types
|
|
* of splits, but it's easier to just let one separate
|
|
* function sort it all out.
|
|
*/
|
|
ocfs2_split_record(inode, left_path, right_path,
|
|
insert_rec, insert->ins_split);
|
|
|
|
/*
|
|
* Split might have modified either leaf and we don't
|
|
* have a guarantee that the later edge insert will
|
|
* dirty this for us.
|
|
*/
|
|
if (left_path)
|
|
ret = ocfs2_journal_dirty(handle,
|
|
path_leaf_bh(left_path));
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
} else
|
|
ocfs2_insert_at_leaf(insert_rec, path_leaf_el(right_path),
|
|
insert, inode);
|
|
|
|
ret = ocfs2_journal_dirty(handle, leaf_bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
if (left_path) {
|
|
/*
|
|
* The rotate code has indicated that we need to fix
|
|
* up portions of the tree after the insert.
|
|
*
|
|
* XXX: Should we extend the transaction here?
|
|
*/
|
|
subtree_index = ocfs2_find_subtree_root(inode, left_path,
|
|
right_path);
|
|
ocfs2_complete_edge_insert(inode, handle, left_path,
|
|
right_path, subtree_index);
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_do_insert_extent(struct inode *inode,
|
|
handle_t *handle,
|
|
struct ocfs2_extent_tree *et,
|
|
struct ocfs2_extent_rec *insert_rec,
|
|
struct ocfs2_insert_type *type)
|
|
{
|
|
int ret, rotate = 0;
|
|
u32 cpos;
|
|
struct ocfs2_path *right_path = NULL;
|
|
struct ocfs2_path *left_path = NULL;
|
|
struct ocfs2_extent_list *el;
|
|
|
|
el = et->et_root_el;
|
|
|
|
ret = ocfs2_et_root_journal_access(handle, inode, et,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (le16_to_cpu(el->l_tree_depth) == 0) {
|
|
ocfs2_insert_at_leaf(insert_rec, el, type, inode);
|
|
goto out_update_clusters;
|
|
}
|
|
|
|
right_path = ocfs2_new_path_from_et(et);
|
|
if (!right_path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Determine the path to start with. Rotations need the
|
|
* rightmost path, everything else can go directly to the
|
|
* target leaf.
|
|
*/
|
|
cpos = le32_to_cpu(insert_rec->e_cpos);
|
|
if (type->ins_appending == APPEND_NONE &&
|
|
type->ins_contig == CONTIG_NONE) {
|
|
rotate = 1;
|
|
cpos = UINT_MAX;
|
|
}
|
|
|
|
ret = ocfs2_find_path(inode, right_path, cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Rotations and appends need special treatment - they modify
|
|
* parts of the tree's above them.
|
|
*
|
|
* Both might pass back a path immediate to the left of the
|
|
* one being inserted to. This will be cause
|
|
* ocfs2_insert_path() to modify the rightmost records of
|
|
* left_path to account for an edge insert.
|
|
*
|
|
* XXX: When modifying this code, keep in mind that an insert
|
|
* can wind up skipping both of these two special cases...
|
|
*/
|
|
if (rotate) {
|
|
ret = ocfs2_rotate_tree_right(inode, handle, type->ins_split,
|
|
le32_to_cpu(insert_rec->e_cpos),
|
|
right_path, &left_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* ocfs2_rotate_tree_right() might have extended the
|
|
* transaction without re-journaling our tree root.
|
|
*/
|
|
ret = ocfs2_et_root_journal_access(handle, inode, et,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
} else if (type->ins_appending == APPEND_TAIL
|
|
&& type->ins_contig != CONTIG_LEFT) {
|
|
ret = ocfs2_append_rec_to_path(inode, handle, insert_rec,
|
|
right_path, &left_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = ocfs2_insert_path(inode, handle, left_path, right_path,
|
|
insert_rec, type);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
out_update_clusters:
|
|
if (type->ins_split == SPLIT_NONE)
|
|
ocfs2_et_update_clusters(inode, et,
|
|
le16_to_cpu(insert_rec->e_leaf_clusters));
|
|
|
|
ret = ocfs2_journal_dirty(handle, et->et_root_bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
out:
|
|
ocfs2_free_path(left_path);
|
|
ocfs2_free_path(right_path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static enum ocfs2_contig_type
|
|
ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path,
|
|
struct ocfs2_extent_list *el, int index,
|
|
struct ocfs2_extent_rec *split_rec)
|
|
{
|
|
int status;
|
|
enum ocfs2_contig_type ret = CONTIG_NONE;
|
|
u32 left_cpos, right_cpos;
|
|
struct ocfs2_extent_rec *rec = NULL;
|
|
struct ocfs2_extent_list *new_el;
|
|
struct ocfs2_path *left_path = NULL, *right_path = NULL;
|
|
struct buffer_head *bh;
|
|
struct ocfs2_extent_block *eb;
|
|
|
|
if (index > 0) {
|
|
rec = &el->l_recs[index - 1];
|
|
} else if (path->p_tree_depth > 0) {
|
|
status = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
|
|
path, &left_cpos);
|
|
if (status)
|
|
goto out;
|
|
|
|
if (left_cpos != 0) {
|
|
left_path = ocfs2_new_path_from_path(path);
|
|
if (!left_path)
|
|
goto out;
|
|
|
|
status = ocfs2_find_path(inode, left_path, left_cpos);
|
|
if (status)
|
|
goto out;
|
|
|
|
new_el = path_leaf_el(left_path);
|
|
|
|
if (le16_to_cpu(new_el->l_next_free_rec) !=
|
|
le16_to_cpu(new_el->l_count)) {
|
|
bh = path_leaf_bh(left_path);
|
|
eb = (struct ocfs2_extent_block *)bh->b_data;
|
|
ocfs2_error(inode->i_sb,
|
|
"Extent block #%llu has an "
|
|
"invalid l_next_free_rec of "
|
|
"%d. It should have "
|
|
"matched the l_count of %d",
|
|
(unsigned long long)le64_to_cpu(eb->h_blkno),
|
|
le16_to_cpu(new_el->l_next_free_rec),
|
|
le16_to_cpu(new_el->l_count));
|
|
status = -EINVAL;
|
|
goto out;
|
|
}
|
|
rec = &new_el->l_recs[
|
|
le16_to_cpu(new_el->l_next_free_rec) - 1];
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We're careful to check for an empty extent record here -
|
|
* the merge code will know what to do if it sees one.
|
|
*/
|
|
if (rec) {
|
|
if (index == 1 && ocfs2_is_empty_extent(rec)) {
|
|
if (split_rec->e_cpos == el->l_recs[index].e_cpos)
|
|
ret = CONTIG_RIGHT;
|
|
} else {
|
|
ret = ocfs2_extent_contig(inode, rec, split_rec);
|
|
}
|
|
}
|
|
|
|
rec = NULL;
|
|
if (index < (le16_to_cpu(el->l_next_free_rec) - 1))
|
|
rec = &el->l_recs[index + 1];
|
|
else if (le16_to_cpu(el->l_next_free_rec) == le16_to_cpu(el->l_count) &&
|
|
path->p_tree_depth > 0) {
|
|
status = ocfs2_find_cpos_for_right_leaf(inode->i_sb,
|
|
path, &right_cpos);
|
|
if (status)
|
|
goto out;
|
|
|
|
if (right_cpos == 0)
|
|
goto out;
|
|
|
|
right_path = ocfs2_new_path_from_path(path);
|
|
if (!right_path)
|
|
goto out;
|
|
|
|
status = ocfs2_find_path(inode, right_path, right_cpos);
|
|
if (status)
|
|
goto out;
|
|
|
|
new_el = path_leaf_el(right_path);
|
|
rec = &new_el->l_recs[0];
|
|
if (ocfs2_is_empty_extent(rec)) {
|
|
if (le16_to_cpu(new_el->l_next_free_rec) <= 1) {
|
|
bh = path_leaf_bh(right_path);
|
|
eb = (struct ocfs2_extent_block *)bh->b_data;
|
|
ocfs2_error(inode->i_sb,
|
|
"Extent block #%llu has an "
|
|
"invalid l_next_free_rec of %d",
|
|
(unsigned long long)le64_to_cpu(eb->h_blkno),
|
|
le16_to_cpu(new_el->l_next_free_rec));
|
|
status = -EINVAL;
|
|
goto out;
|
|
}
|
|
rec = &new_el->l_recs[1];
|
|
}
|
|
}
|
|
|
|
if (rec) {
|
|
enum ocfs2_contig_type contig_type;
|
|
|
|
contig_type = ocfs2_extent_contig(inode, rec, split_rec);
|
|
|
|
if (contig_type == CONTIG_LEFT && ret == CONTIG_RIGHT)
|
|
ret = CONTIG_LEFTRIGHT;
|
|
else if (ret == CONTIG_NONE)
|
|
ret = contig_type;
|
|
}
|
|
|
|
out:
|
|
if (left_path)
|
|
ocfs2_free_path(left_path);
|
|
if (right_path)
|
|
ocfs2_free_path(right_path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_figure_contig_type(struct inode *inode,
|
|
struct ocfs2_insert_type *insert,
|
|
struct ocfs2_extent_list *el,
|
|
struct ocfs2_extent_rec *insert_rec,
|
|
struct ocfs2_extent_tree *et)
|
|
{
|
|
int i;
|
|
enum ocfs2_contig_type contig_type = CONTIG_NONE;
|
|
|
|
BUG_ON(le16_to_cpu(el->l_tree_depth) != 0);
|
|
|
|
for(i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
|
|
contig_type = ocfs2_extent_contig(inode, &el->l_recs[i],
|
|
insert_rec);
|
|
if (contig_type != CONTIG_NONE) {
|
|
insert->ins_contig_index = i;
|
|
break;
|
|
}
|
|
}
|
|
insert->ins_contig = contig_type;
|
|
|
|
if (insert->ins_contig != CONTIG_NONE) {
|
|
struct ocfs2_extent_rec *rec =
|
|
&el->l_recs[insert->ins_contig_index];
|
|
unsigned int len = le16_to_cpu(rec->e_leaf_clusters) +
|
|
le16_to_cpu(insert_rec->e_leaf_clusters);
|
|
|
|
/*
|
|
* Caller might want us to limit the size of extents, don't
|
|
* calculate contiguousness if we might exceed that limit.
|
|
*/
|
|
if (et->et_max_leaf_clusters &&
|
|
(len > et->et_max_leaf_clusters))
|
|
insert->ins_contig = CONTIG_NONE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This should only be called against the righmost leaf extent list.
|
|
*
|
|
* ocfs2_figure_appending_type() will figure out whether we'll have to
|
|
* insert at the tail of the rightmost leaf.
|
|
*
|
|
* This should also work against the root extent list for tree's with 0
|
|
* depth. If we consider the root extent list to be the rightmost leaf node
|
|
* then the logic here makes sense.
|
|
*/
|
|
static void ocfs2_figure_appending_type(struct ocfs2_insert_type *insert,
|
|
struct ocfs2_extent_list *el,
|
|
struct ocfs2_extent_rec *insert_rec)
|
|
{
|
|
int i;
|
|
u32 cpos = le32_to_cpu(insert_rec->e_cpos);
|
|
struct ocfs2_extent_rec *rec;
|
|
|
|
insert->ins_appending = APPEND_NONE;
|
|
|
|
BUG_ON(le16_to_cpu(el->l_tree_depth) != 0);
|
|
|
|
if (!el->l_next_free_rec)
|
|
goto set_tail_append;
|
|
|
|
if (ocfs2_is_empty_extent(&el->l_recs[0])) {
|
|
/* Were all records empty? */
|
|
if (le16_to_cpu(el->l_next_free_rec) == 1)
|
|
goto set_tail_append;
|
|
}
|
|
|
|
i = le16_to_cpu(el->l_next_free_rec) - 1;
|
|
rec = &el->l_recs[i];
|
|
|
|
if (cpos >=
|
|
(le32_to_cpu(rec->e_cpos) + le16_to_cpu(rec->e_leaf_clusters)))
|
|
goto set_tail_append;
|
|
|
|
return;
|
|
|
|
set_tail_append:
|
|
insert->ins_appending = APPEND_TAIL;
|
|
}
|
|
|
|
/*
|
|
* Helper function called at the begining of an insert.
|
|
*
|
|
* This computes a few things that are commonly used in the process of
|
|
* inserting into the btree:
|
|
* - Whether the new extent is contiguous with an existing one.
|
|
* - The current tree depth.
|
|
* - Whether the insert is an appending one.
|
|
* - The total # of free records in the tree.
|
|
*
|
|
* All of the information is stored on the ocfs2_insert_type
|
|
* structure.
|
|
*/
|
|
static int ocfs2_figure_insert_type(struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
struct buffer_head **last_eb_bh,
|
|
struct ocfs2_extent_rec *insert_rec,
|
|
int *free_records,
|
|
struct ocfs2_insert_type *insert)
|
|
{
|
|
int ret;
|
|
struct ocfs2_extent_block *eb;
|
|
struct ocfs2_extent_list *el;
|
|
struct ocfs2_path *path = NULL;
|
|
struct buffer_head *bh = NULL;
|
|
|
|
insert->ins_split = SPLIT_NONE;
|
|
|
|
el = et->et_root_el;
|
|
insert->ins_tree_depth = le16_to_cpu(el->l_tree_depth);
|
|
|
|
if (el->l_tree_depth) {
|
|
/*
|
|
* If we have tree depth, we read in the
|
|
* rightmost extent block ahead of time as
|
|
* ocfs2_figure_insert_type() and ocfs2_add_branch()
|
|
* may want it later.
|
|
*/
|
|
ret = ocfs2_read_extent_block(inode,
|
|
ocfs2_et_get_last_eb_blk(et),
|
|
&bh);
|
|
if (ret) {
|
|
mlog_exit(ret);
|
|
goto out;
|
|
}
|
|
eb = (struct ocfs2_extent_block *) bh->b_data;
|
|
el = &eb->h_list;
|
|
}
|
|
|
|
/*
|
|
* Unless we have a contiguous insert, we'll need to know if
|
|
* there is room left in our allocation tree for another
|
|
* extent record.
|
|
*
|
|
* XXX: This test is simplistic, we can search for empty
|
|
* extent records too.
|
|
*/
|
|
*free_records = le16_to_cpu(el->l_count) -
|
|
le16_to_cpu(el->l_next_free_rec);
|
|
|
|
if (!insert->ins_tree_depth) {
|
|
ocfs2_figure_contig_type(inode, insert, el, insert_rec, et);
|
|
ocfs2_figure_appending_type(insert, el, insert_rec);
|
|
return 0;
|
|
}
|
|
|
|
path = ocfs2_new_path_from_et(et);
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* In the case that we're inserting past what the tree
|
|
* currently accounts for, ocfs2_find_path() will return for
|
|
* us the rightmost tree path. This is accounted for below in
|
|
* the appending code.
|
|
*/
|
|
ret = ocfs2_find_path(inode, path, le32_to_cpu(insert_rec->e_cpos));
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
el = path_leaf_el(path);
|
|
|
|
/*
|
|
* Now that we have the path, there's two things we want to determine:
|
|
* 1) Contiguousness (also set contig_index if this is so)
|
|
*
|
|
* 2) Are we doing an append? We can trivially break this up
|
|
* into two types of appends: simple record append, or a
|
|
* rotate inside the tail leaf.
|
|
*/
|
|
ocfs2_figure_contig_type(inode, insert, el, insert_rec, et);
|
|
|
|
/*
|
|
* The insert code isn't quite ready to deal with all cases of
|
|
* left contiguousness. Specifically, if it's an insert into
|
|
* the 1st record in a leaf, it will require the adjustment of
|
|
* cluster count on the last record of the path directly to it's
|
|
* left. For now, just catch that case and fool the layers
|
|
* above us. This works just fine for tree_depth == 0, which
|
|
* is why we allow that above.
|
|
*/
|
|
if (insert->ins_contig == CONTIG_LEFT &&
|
|
insert->ins_contig_index == 0)
|
|
insert->ins_contig = CONTIG_NONE;
|
|
|
|
/*
|
|
* Ok, so we can simply compare against last_eb to figure out
|
|
* whether the path doesn't exist. This will only happen in
|
|
* the case that we're doing a tail append, so maybe we can
|
|
* take advantage of that information somehow.
|
|
*/
|
|
if (ocfs2_et_get_last_eb_blk(et) ==
|
|
path_leaf_bh(path)->b_blocknr) {
|
|
/*
|
|
* Ok, ocfs2_find_path() returned us the rightmost
|
|
* tree path. This might be an appending insert. There are
|
|
* two cases:
|
|
* 1) We're doing a true append at the tail:
|
|
* -This might even be off the end of the leaf
|
|
* 2) We're "appending" by rotating in the tail
|
|
*/
|
|
ocfs2_figure_appending_type(insert, el, insert_rec);
|
|
}
|
|
|
|
out:
|
|
ocfs2_free_path(path);
|
|
|
|
if (ret == 0)
|
|
*last_eb_bh = bh;
|
|
else
|
|
brelse(bh);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Insert an extent into an inode btree.
|
|
*
|
|
* The caller needs to update fe->i_clusters
|
|
*/
|
|
int ocfs2_insert_extent(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
u32 cpos,
|
|
u64 start_blk,
|
|
u32 new_clusters,
|
|
u8 flags,
|
|
struct ocfs2_alloc_context *meta_ac)
|
|
{
|
|
int status;
|
|
int uninitialized_var(free_records);
|
|
struct buffer_head *last_eb_bh = NULL;
|
|
struct ocfs2_insert_type insert = {0, };
|
|
struct ocfs2_extent_rec rec;
|
|
|
|
mlog(0, "add %u clusters at position %u to inode %llu\n",
|
|
new_clusters, cpos, (unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
|
|
memset(&rec, 0, sizeof(rec));
|
|
rec.e_cpos = cpu_to_le32(cpos);
|
|
rec.e_blkno = cpu_to_le64(start_blk);
|
|
rec.e_leaf_clusters = cpu_to_le16(new_clusters);
|
|
rec.e_flags = flags;
|
|
status = ocfs2_et_insert_check(inode, et, &rec);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_figure_insert_type(inode, et, &last_eb_bh, &rec,
|
|
&free_records, &insert);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
mlog(0, "Insert.appending: %u, Insert.Contig: %u, "
|
|
"Insert.contig_index: %d, Insert.free_records: %d, "
|
|
"Insert.tree_depth: %d\n",
|
|
insert.ins_appending, insert.ins_contig, insert.ins_contig_index,
|
|
free_records, insert.ins_tree_depth);
|
|
|
|
if (insert.ins_contig == CONTIG_NONE && free_records == 0) {
|
|
status = ocfs2_grow_tree(inode, handle, et,
|
|
&insert.ins_tree_depth, &last_eb_bh,
|
|
meta_ac);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
/* Finally, we can add clusters. This might rotate the tree for us. */
|
|
status = ocfs2_do_insert_extent(inode, handle, et, &rec, &insert);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
else if (et->et_ops == &ocfs2_dinode_et_ops)
|
|
ocfs2_extent_map_insert_rec(inode, &rec);
|
|
|
|
bail:
|
|
brelse(last_eb_bh);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Allcate and add clusters into the extent b-tree.
|
|
* The new clusters(clusters_to_add) will be inserted at logical_offset.
|
|
* The extent b-tree's root is specified by et, and
|
|
* it is not limited to the file storage. Any extent tree can use this
|
|
* function if it implements the proper ocfs2_extent_tree.
|
|
*/
|
|
int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
|
|
struct inode *inode,
|
|
u32 *logical_offset,
|
|
u32 clusters_to_add,
|
|
int mark_unwritten,
|
|
struct ocfs2_extent_tree *et,
|
|
handle_t *handle,
|
|
struct ocfs2_alloc_context *data_ac,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
enum ocfs2_alloc_restarted *reason_ret)
|
|
{
|
|
int status = 0;
|
|
int free_extents;
|
|
enum ocfs2_alloc_restarted reason = RESTART_NONE;
|
|
u32 bit_off, num_bits;
|
|
u64 block;
|
|
u8 flags = 0;
|
|
|
|
BUG_ON(!clusters_to_add);
|
|
|
|
if (mark_unwritten)
|
|
flags = OCFS2_EXT_UNWRITTEN;
|
|
|
|
free_extents = ocfs2_num_free_extents(osb, inode, et);
|
|
if (free_extents < 0) {
|
|
status = free_extents;
|
|
mlog_errno(status);
|
|
goto leave;
|
|
}
|
|
|
|
/* there are two cases which could cause us to EAGAIN in the
|
|
* we-need-more-metadata case:
|
|
* 1) we haven't reserved *any*
|
|
* 2) we are so fragmented, we've needed to add metadata too
|
|
* many times. */
|
|
if (!free_extents && !meta_ac) {
|
|
mlog(0, "we haven't reserved any metadata!\n");
|
|
status = -EAGAIN;
|
|
reason = RESTART_META;
|
|
goto leave;
|
|
} else if ((!free_extents)
|
|
&& (ocfs2_alloc_context_bits_left(meta_ac)
|
|
< ocfs2_extend_meta_needed(et->et_root_el))) {
|
|
mlog(0, "filesystem is really fragmented...\n");
|
|
status = -EAGAIN;
|
|
reason = RESTART_META;
|
|
goto leave;
|
|
}
|
|
|
|
status = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
|
|
clusters_to_add, &bit_off, &num_bits);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto leave;
|
|
}
|
|
|
|
BUG_ON(num_bits > clusters_to_add);
|
|
|
|
/* reserve our write early -- insert_extent may update the tree root */
|
|
status = ocfs2_et_root_journal_access(handle, inode, et,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto leave;
|
|
}
|
|
|
|
block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
|
|
mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
|
|
num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
status = ocfs2_insert_extent(osb, handle, inode, et,
|
|
*logical_offset, block,
|
|
num_bits, flags, meta_ac);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto leave;
|
|
}
|
|
|
|
status = ocfs2_journal_dirty(handle, et->et_root_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto leave;
|
|
}
|
|
|
|
clusters_to_add -= num_bits;
|
|
*logical_offset += num_bits;
|
|
|
|
if (clusters_to_add) {
|
|
mlog(0, "need to alloc once more, wanted = %u\n",
|
|
clusters_to_add);
|
|
status = -EAGAIN;
|
|
reason = RESTART_TRANS;
|
|
}
|
|
|
|
leave:
|
|
mlog_exit(status);
|
|
if (reason_ret)
|
|
*reason_ret = reason;
|
|
return status;
|
|
}
|
|
|
|
static void ocfs2_make_right_split_rec(struct super_block *sb,
|
|
struct ocfs2_extent_rec *split_rec,
|
|
u32 cpos,
|
|
struct ocfs2_extent_rec *rec)
|
|
{
|
|
u32 rec_cpos = le32_to_cpu(rec->e_cpos);
|
|
u32 rec_range = rec_cpos + le16_to_cpu(rec->e_leaf_clusters);
|
|
|
|
memset(split_rec, 0, sizeof(struct ocfs2_extent_rec));
|
|
|
|
split_rec->e_cpos = cpu_to_le32(cpos);
|
|
split_rec->e_leaf_clusters = cpu_to_le16(rec_range - cpos);
|
|
|
|
split_rec->e_blkno = rec->e_blkno;
|
|
le64_add_cpu(&split_rec->e_blkno,
|
|
ocfs2_clusters_to_blocks(sb, cpos - rec_cpos));
|
|
|
|
split_rec->e_flags = rec->e_flags;
|
|
}
|
|
|
|
static int ocfs2_split_and_insert(struct inode *inode,
|
|
handle_t *handle,
|
|
struct ocfs2_path *path,
|
|
struct ocfs2_extent_tree *et,
|
|
struct buffer_head **last_eb_bh,
|
|
int split_index,
|
|
struct ocfs2_extent_rec *orig_split_rec,
|
|
struct ocfs2_alloc_context *meta_ac)
|
|
{
|
|
int ret = 0, depth;
|
|
unsigned int insert_range, rec_range, do_leftright = 0;
|
|
struct ocfs2_extent_rec tmprec;
|
|
struct ocfs2_extent_list *rightmost_el;
|
|
struct ocfs2_extent_rec rec;
|
|
struct ocfs2_extent_rec split_rec = *orig_split_rec;
|
|
struct ocfs2_insert_type insert;
|
|
struct ocfs2_extent_block *eb;
|
|
|
|
leftright:
|
|
/*
|
|
* Store a copy of the record on the stack - it might move
|
|
* around as the tree is manipulated below.
|
|
*/
|
|
rec = path_leaf_el(path)->l_recs[split_index];
|
|
|
|
rightmost_el = et->et_root_el;
|
|
|
|
depth = le16_to_cpu(rightmost_el->l_tree_depth);
|
|
if (depth) {
|
|
BUG_ON(!(*last_eb_bh));
|
|
eb = (struct ocfs2_extent_block *) (*last_eb_bh)->b_data;
|
|
rightmost_el = &eb->h_list;
|
|
}
|
|
|
|
if (le16_to_cpu(rightmost_el->l_next_free_rec) ==
|
|
le16_to_cpu(rightmost_el->l_count)) {
|
|
ret = ocfs2_grow_tree(inode, handle, et,
|
|
&depth, last_eb_bh, meta_ac);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
memset(&insert, 0, sizeof(struct ocfs2_insert_type));
|
|
insert.ins_appending = APPEND_NONE;
|
|
insert.ins_contig = CONTIG_NONE;
|
|
insert.ins_tree_depth = depth;
|
|
|
|
insert_range = le32_to_cpu(split_rec.e_cpos) +
|
|
le16_to_cpu(split_rec.e_leaf_clusters);
|
|
rec_range = le32_to_cpu(rec.e_cpos) +
|
|
le16_to_cpu(rec.e_leaf_clusters);
|
|
|
|
if (split_rec.e_cpos == rec.e_cpos) {
|
|
insert.ins_split = SPLIT_LEFT;
|
|
} else if (insert_range == rec_range) {
|
|
insert.ins_split = SPLIT_RIGHT;
|
|
} else {
|
|
/*
|
|
* Left/right split. We fake this as a right split
|
|
* first and then make a second pass as a left split.
|
|
*/
|
|
insert.ins_split = SPLIT_RIGHT;
|
|
|
|
ocfs2_make_right_split_rec(inode->i_sb, &tmprec, insert_range,
|
|
&rec);
|
|
|
|
split_rec = tmprec;
|
|
|
|
BUG_ON(do_leftright);
|
|
do_leftright = 1;
|
|
}
|
|
|
|
ret = ocfs2_do_insert_extent(inode, handle, et, &split_rec, &insert);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (do_leftright == 1) {
|
|
u32 cpos;
|
|
struct ocfs2_extent_list *el;
|
|
|
|
do_leftright++;
|
|
split_rec = *orig_split_rec;
|
|
|
|
ocfs2_reinit_path(path, 1);
|
|
|
|
cpos = le32_to_cpu(split_rec.e_cpos);
|
|
ret = ocfs2_find_path(inode, path, cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
el = path_leaf_el(path);
|
|
split_index = ocfs2_search_extent_list(el, cpos);
|
|
goto leftright;
|
|
}
|
|
out:
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_replace_extent_rec(struct inode *inode,
|
|
handle_t *handle,
|
|
struct ocfs2_path *path,
|
|
struct ocfs2_extent_list *el,
|
|
int split_index,
|
|
struct ocfs2_extent_rec *split_rec)
|
|
{
|
|
int ret;
|
|
|
|
ret = ocfs2_path_bh_journal_access(handle, inode, path,
|
|
path_num_items(path) - 1);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
el->l_recs[split_index] = *split_rec;
|
|
|
|
ocfs2_journal_dirty(handle, path_leaf_bh(path));
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Mark part or all of the extent record at split_index in the leaf
|
|
* pointed to by path as written. This removes the unwritten
|
|
* extent flag.
|
|
*
|
|
* Care is taken to handle contiguousness so as to not grow the tree.
|
|
*
|
|
* meta_ac is not strictly necessary - we only truly need it if growth
|
|
* of the tree is required. All other cases will degrade into a less
|
|
* optimal tree layout.
|
|
*
|
|
* last_eb_bh should be the rightmost leaf block for any extent
|
|
* btree. Since a split may grow the tree or a merge might shrink it,
|
|
* the caller cannot trust the contents of that buffer after this call.
|
|
*
|
|
* This code is optimized for readability - several passes might be
|
|
* made over certain portions of the tree. All of those blocks will
|
|
* have been brought into cache (and pinned via the journal), so the
|
|
* extra overhead is not expressed in terms of disk reads.
|
|
*/
|
|
static int __ocfs2_mark_extent_written(struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
handle_t *handle,
|
|
struct ocfs2_path *path,
|
|
int split_index,
|
|
struct ocfs2_extent_rec *split_rec,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc)
|
|
{
|
|
int ret = 0;
|
|
struct ocfs2_extent_list *el = path_leaf_el(path);
|
|
struct buffer_head *last_eb_bh = NULL;
|
|
struct ocfs2_extent_rec *rec = &el->l_recs[split_index];
|
|
struct ocfs2_merge_ctxt ctxt;
|
|
struct ocfs2_extent_list *rightmost_el;
|
|
|
|
if (!(rec->e_flags & OCFS2_EXT_UNWRITTEN)) {
|
|
ret = -EIO;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (le32_to_cpu(rec->e_cpos) > le32_to_cpu(split_rec->e_cpos) ||
|
|
((le32_to_cpu(rec->e_cpos) + le16_to_cpu(rec->e_leaf_clusters)) <
|
|
(le32_to_cpu(split_rec->e_cpos) + le16_to_cpu(split_rec->e_leaf_clusters)))) {
|
|
ret = -EIO;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ctxt.c_contig_type = ocfs2_figure_merge_contig_type(inode, path, el,
|
|
split_index,
|
|
split_rec);
|
|
|
|
/*
|
|
* The core merge / split code wants to know how much room is
|
|
* left in this inodes allocation tree, so we pass the
|
|
* rightmost extent list.
|
|
*/
|
|
if (path->p_tree_depth) {
|
|
struct ocfs2_extent_block *eb;
|
|
|
|
ret = ocfs2_read_extent_block(inode,
|
|
ocfs2_et_get_last_eb_blk(et),
|
|
&last_eb_bh);
|
|
if (ret) {
|
|
mlog_exit(ret);
|
|
goto out;
|
|
}
|
|
|
|
eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
|
|
rightmost_el = &eb->h_list;
|
|
} else
|
|
rightmost_el = path_root_el(path);
|
|
|
|
if (rec->e_cpos == split_rec->e_cpos &&
|
|
rec->e_leaf_clusters == split_rec->e_leaf_clusters)
|
|
ctxt.c_split_covers_rec = 1;
|
|
else
|
|
ctxt.c_split_covers_rec = 0;
|
|
|
|
ctxt.c_has_empty_extent = ocfs2_is_empty_extent(&el->l_recs[0]);
|
|
|
|
mlog(0, "index: %d, contig: %u, has_empty: %u, split_covers: %u\n",
|
|
split_index, ctxt.c_contig_type, ctxt.c_has_empty_extent,
|
|
ctxt.c_split_covers_rec);
|
|
|
|
if (ctxt.c_contig_type == CONTIG_NONE) {
|
|
if (ctxt.c_split_covers_rec)
|
|
ret = ocfs2_replace_extent_rec(inode, handle,
|
|
path, el,
|
|
split_index, split_rec);
|
|
else
|
|
ret = ocfs2_split_and_insert(inode, handle, path, et,
|
|
&last_eb_bh, split_index,
|
|
split_rec, meta_ac);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
} else {
|
|
ret = ocfs2_try_to_merge_extent(inode, handle, path,
|
|
split_index, split_rec,
|
|
dealloc, &ctxt, et);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
out:
|
|
brelse(last_eb_bh);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Mark the already-existing extent at cpos as written for len clusters.
|
|
*
|
|
* If the existing extent is larger than the request, initiate a
|
|
* split. An attempt will be made at merging with adjacent extents.
|
|
*
|
|
* The caller is responsible for passing down meta_ac if we'll need it.
|
|
*/
|
|
int ocfs2_mark_extent_written(struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
handle_t *handle, u32 cpos, u32 len, u32 phys,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc)
|
|
{
|
|
int ret, index;
|
|
u64 start_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys);
|
|
struct ocfs2_extent_rec split_rec;
|
|
struct ocfs2_path *left_path = NULL;
|
|
struct ocfs2_extent_list *el;
|
|
|
|
mlog(0, "Inode %lu cpos %u, len %u, phys %u (%llu)\n",
|
|
inode->i_ino, cpos, len, phys, (unsigned long long)start_blkno);
|
|
|
|
if (!ocfs2_writes_unwritten_extents(OCFS2_SB(inode->i_sb))) {
|
|
ocfs2_error(inode->i_sb, "Inode %llu has unwritten extents "
|
|
"that are being written to, but the feature bit "
|
|
"is not set in the super block.",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
ret = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* XXX: This should be fixed up so that we just re-insert the
|
|
* next extent records.
|
|
*
|
|
* XXX: This is a hack on the extent tree, maybe it should be
|
|
* an op?
|
|
*/
|
|
if (et->et_ops == &ocfs2_dinode_et_ops)
|
|
ocfs2_extent_map_trunc(inode, 0);
|
|
|
|
left_path = ocfs2_new_path_from_et(et);
|
|
if (!left_path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_path(inode, left_path, cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
el = path_leaf_el(left_path);
|
|
|
|
index = ocfs2_search_extent_list(el, cpos);
|
|
if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu has an extent at cpos %u which can no "
|
|
"longer be found.\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, cpos);
|
|
ret = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
memset(&split_rec, 0, sizeof(struct ocfs2_extent_rec));
|
|
split_rec.e_cpos = cpu_to_le32(cpos);
|
|
split_rec.e_leaf_clusters = cpu_to_le16(len);
|
|
split_rec.e_blkno = cpu_to_le64(start_blkno);
|
|
split_rec.e_flags = path_leaf_el(left_path)->l_recs[index].e_flags;
|
|
split_rec.e_flags &= ~OCFS2_EXT_UNWRITTEN;
|
|
|
|
ret = __ocfs2_mark_extent_written(inode, et, handle, left_path,
|
|
index, &split_rec, meta_ac,
|
|
dealloc);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
out:
|
|
ocfs2_free_path(left_path);
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_split_tree(struct inode *inode, struct ocfs2_extent_tree *et,
|
|
handle_t *handle, struct ocfs2_path *path,
|
|
int index, u32 new_range,
|
|
struct ocfs2_alloc_context *meta_ac)
|
|
{
|
|
int ret, depth, credits = handle->h_buffer_credits;
|
|
struct buffer_head *last_eb_bh = NULL;
|
|
struct ocfs2_extent_block *eb;
|
|
struct ocfs2_extent_list *rightmost_el, *el;
|
|
struct ocfs2_extent_rec split_rec;
|
|
struct ocfs2_extent_rec *rec;
|
|
struct ocfs2_insert_type insert;
|
|
|
|
/*
|
|
* Setup the record to split before we grow the tree.
|
|
*/
|
|
el = path_leaf_el(path);
|
|
rec = &el->l_recs[index];
|
|
ocfs2_make_right_split_rec(inode->i_sb, &split_rec, new_range, rec);
|
|
|
|
depth = path->p_tree_depth;
|
|
if (depth > 0) {
|
|
ret = ocfs2_read_extent_block(inode,
|
|
ocfs2_et_get_last_eb_blk(et),
|
|
&last_eb_bh);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
|
|
rightmost_el = &eb->h_list;
|
|
} else
|
|
rightmost_el = path_leaf_el(path);
|
|
|
|
credits += path->p_tree_depth +
|
|
ocfs2_extend_meta_needed(et->et_root_el);
|
|
ret = ocfs2_extend_trans(handle, credits);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (le16_to_cpu(rightmost_el->l_next_free_rec) ==
|
|
le16_to_cpu(rightmost_el->l_count)) {
|
|
ret = ocfs2_grow_tree(inode, handle, et, &depth, &last_eb_bh,
|
|
meta_ac);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
memset(&insert, 0, sizeof(struct ocfs2_insert_type));
|
|
insert.ins_appending = APPEND_NONE;
|
|
insert.ins_contig = CONTIG_NONE;
|
|
insert.ins_split = SPLIT_RIGHT;
|
|
insert.ins_tree_depth = depth;
|
|
|
|
ret = ocfs2_do_insert_extent(inode, handle, et, &split_rec, &insert);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
out:
|
|
brelse(last_eb_bh);
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
|
|
struct ocfs2_path *path, int index,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc,
|
|
u32 cpos, u32 len,
|
|
struct ocfs2_extent_tree *et)
|
|
{
|
|
int ret;
|
|
u32 left_cpos, rec_range, trunc_range;
|
|
int wants_rotate = 0, is_rightmost_tree_rec = 0;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct ocfs2_path *left_path = NULL;
|
|
struct ocfs2_extent_list *el = path_leaf_el(path);
|
|
struct ocfs2_extent_rec *rec;
|
|
struct ocfs2_extent_block *eb;
|
|
|
|
if (ocfs2_is_empty_extent(&el->l_recs[0]) && index > 0) {
|
|
ret = ocfs2_rotate_tree_left(inode, handle, path, dealloc, et);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
index--;
|
|
}
|
|
|
|
if (index == (le16_to_cpu(el->l_next_free_rec) - 1) &&
|
|
path->p_tree_depth) {
|
|
/*
|
|
* Check whether this is the rightmost tree record. If
|
|
* we remove all of this record or part of its right
|
|
* edge then an update of the record lengths above it
|
|
* will be required.
|
|
*/
|
|
eb = (struct ocfs2_extent_block *)path_leaf_bh(path)->b_data;
|
|
if (eb->h_next_leaf_blk == 0)
|
|
is_rightmost_tree_rec = 1;
|
|
}
|
|
|
|
rec = &el->l_recs[index];
|
|
if (index == 0 && path->p_tree_depth &&
|
|
le32_to_cpu(rec->e_cpos) == cpos) {
|
|
/*
|
|
* Changing the leftmost offset (via partial or whole
|
|
* record truncate) of an interior (or rightmost) path
|
|
* means we have to update the subtree that is formed
|
|
* by this leaf and the one to it's left.
|
|
*
|
|
* There are two cases we can skip:
|
|
* 1) Path is the leftmost one in our inode tree.
|
|
* 2) The leaf is rightmost and will be empty after
|
|
* we remove the extent record - the rotate code
|
|
* knows how to update the newly formed edge.
|
|
*/
|
|
|
|
ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, path,
|
|
&left_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (left_cpos && le16_to_cpu(el->l_next_free_rec) > 1) {
|
|
left_path = ocfs2_new_path_from_path(path);
|
|
if (!left_path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_path(inode, left_path, left_cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
ret = ocfs2_extend_rotate_transaction(handle, 0,
|
|
handle->h_buffer_credits,
|
|
path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_journal_access_path(inode, handle, path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_journal_access_path(inode, handle, left_path);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
rec_range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
|
|
trunc_range = cpos + len;
|
|
|
|
if (le32_to_cpu(rec->e_cpos) == cpos && rec_range == trunc_range) {
|
|
int next_free;
|
|
|
|
memset(rec, 0, sizeof(*rec));
|
|
ocfs2_cleanup_merge(el, index);
|
|
wants_rotate = 1;
|
|
|
|
next_free = le16_to_cpu(el->l_next_free_rec);
|
|
if (is_rightmost_tree_rec && next_free > 1) {
|
|
/*
|
|
* We skip the edge update if this path will
|
|
* be deleted by the rotate code.
|
|
*/
|
|
rec = &el->l_recs[next_free - 1];
|
|
ocfs2_adjust_rightmost_records(inode, handle, path,
|
|
rec);
|
|
}
|
|
} else if (le32_to_cpu(rec->e_cpos) == cpos) {
|
|
/* Remove leftmost portion of the record. */
|
|
le32_add_cpu(&rec->e_cpos, len);
|
|
le64_add_cpu(&rec->e_blkno, ocfs2_clusters_to_blocks(sb, len));
|
|
le16_add_cpu(&rec->e_leaf_clusters, -len);
|
|
} else if (rec_range == trunc_range) {
|
|
/* Remove rightmost portion of the record */
|
|
le16_add_cpu(&rec->e_leaf_clusters, -len);
|
|
if (is_rightmost_tree_rec)
|
|
ocfs2_adjust_rightmost_records(inode, handle, path, rec);
|
|
} else {
|
|
/* Caller should have trapped this. */
|
|
mlog(ML_ERROR, "Inode %llu: Invalid record truncate: (%u, %u) "
|
|
"(%u, %u)\n", (unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
le32_to_cpu(rec->e_cpos),
|
|
le16_to_cpu(rec->e_leaf_clusters), cpos, len);
|
|
BUG();
|
|
}
|
|
|
|
if (left_path) {
|
|
int subtree_index;
|
|
|
|
subtree_index = ocfs2_find_subtree_root(inode, left_path, path);
|
|
ocfs2_complete_edge_insert(inode, handle, left_path, path,
|
|
subtree_index);
|
|
}
|
|
|
|
ocfs2_journal_dirty(handle, path_leaf_bh(path));
|
|
|
|
ret = ocfs2_rotate_tree_left(inode, handle, path, dealloc, et);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
ocfs2_free_path(left_path);
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_remove_extent(struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
u32 cpos, u32 len, handle_t *handle,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc)
|
|
{
|
|
int ret, index;
|
|
u32 rec_range, trunc_range;
|
|
struct ocfs2_extent_rec *rec;
|
|
struct ocfs2_extent_list *el;
|
|
struct ocfs2_path *path = NULL;
|
|
|
|
ocfs2_extent_map_trunc(inode, 0);
|
|
|
|
path = ocfs2_new_path_from_et(et);
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_path(inode, path, cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
el = path_leaf_el(path);
|
|
index = ocfs2_search_extent_list(el, cpos);
|
|
if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu has an extent at cpos %u which can no "
|
|
"longer be found.\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, cpos);
|
|
ret = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We have 3 cases of extent removal:
|
|
* 1) Range covers the entire extent rec
|
|
* 2) Range begins or ends on one edge of the extent rec
|
|
* 3) Range is in the middle of the extent rec (no shared edges)
|
|
*
|
|
* For case 1 we remove the extent rec and left rotate to
|
|
* fill the hole.
|
|
*
|
|
* For case 2 we just shrink the existing extent rec, with a
|
|
* tree update if the shrinking edge is also the edge of an
|
|
* extent block.
|
|
*
|
|
* For case 3 we do a right split to turn the extent rec into
|
|
* something case 2 can handle.
|
|
*/
|
|
rec = &el->l_recs[index];
|
|
rec_range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
|
|
trunc_range = cpos + len;
|
|
|
|
BUG_ON(cpos < le32_to_cpu(rec->e_cpos) || trunc_range > rec_range);
|
|
|
|
mlog(0, "Inode %llu, remove (cpos %u, len %u). Existing index %d "
|
|
"(cpos %u, len %u)\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, cpos, len, index,
|
|
le32_to_cpu(rec->e_cpos), ocfs2_rec_clusters(el, rec));
|
|
|
|
if (le32_to_cpu(rec->e_cpos) == cpos || rec_range == trunc_range) {
|
|
ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc,
|
|
cpos, len, et);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
} else {
|
|
ret = ocfs2_split_tree(inode, et, handle, path, index,
|
|
trunc_range, meta_ac);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The split could have manipulated the tree enough to
|
|
* move the record location, so we have to look for it again.
|
|
*/
|
|
ocfs2_reinit_path(path, 1);
|
|
|
|
ret = ocfs2_find_path(inode, path, cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
el = path_leaf_el(path);
|
|
index = ocfs2_search_extent_list(el, cpos);
|
|
if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu: split at cpos %u lost record.",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
cpos);
|
|
ret = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Double check our values here. If anything is fishy,
|
|
* it's easier to catch it at the top level.
|
|
*/
|
|
rec = &el->l_recs[index];
|
|
rec_range = le32_to_cpu(rec->e_cpos) +
|
|
ocfs2_rec_clusters(el, rec);
|
|
if (rec_range != trunc_range) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu: error after split at cpos %u"
|
|
"trunc len %u, existing record is (%u,%u)",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
cpos, len, le32_to_cpu(rec->e_cpos),
|
|
ocfs2_rec_clusters(el, rec));
|
|
ret = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc,
|
|
cpos, len, et);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
ocfs2_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_remove_btree_range(struct inode *inode,
|
|
struct ocfs2_extent_tree *et,
|
|
u32 cpos, u32 phys_cpos, u32 len,
|
|
struct ocfs2_cached_dealloc_ctxt *dealloc)
|
|
{
|
|
int ret;
|
|
u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
struct inode *tl_inode = osb->osb_tl_inode;
|
|
handle_t *handle;
|
|
struct ocfs2_alloc_context *meta_ac = NULL;
|
|
|
|
ret = ocfs2_lock_allocators(inode, et, 0, 1, NULL, &meta_ac);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
return ret;
|
|
}
|
|
|
|
mutex_lock(&tl_inode->i_mutex);
|
|
|
|
if (ocfs2_truncate_log_needs_flush(osb)) {
|
|
ret = __ocfs2_flush_truncate_log(osb);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
|
|
if (IS_ERR(handle)) {
|
|
ret = PTR_ERR(handle);
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_et_root_journal_access(handle, inode, et,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
vfs_dq_free_space_nodirty(inode,
|
|
ocfs2_clusters_to_bytes(inode->i_sb, len));
|
|
|
|
ret = ocfs2_remove_extent(inode, et, cpos, len, handle, meta_ac,
|
|
dealloc);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
ocfs2_et_update_clusters(inode, et, -len);
|
|
|
|
ret = ocfs2_journal_dirty(handle, et->et_root_bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
out_commit:
|
|
ocfs2_commit_trans(osb, handle);
|
|
out:
|
|
mutex_unlock(&tl_inode->i_mutex);
|
|
|
|
if (meta_ac)
|
|
ocfs2_free_alloc_context(meta_ac);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb)
|
|
{
|
|
struct buffer_head *tl_bh = osb->osb_tl_bh;
|
|
struct ocfs2_dinode *di;
|
|
struct ocfs2_truncate_log *tl;
|
|
|
|
di = (struct ocfs2_dinode *) tl_bh->b_data;
|
|
tl = &di->id2.i_dealloc;
|
|
|
|
mlog_bug_on_msg(le16_to_cpu(tl->tl_used) > le16_to_cpu(tl->tl_count),
|
|
"slot %d, invalid truncate log parameters: used = "
|
|
"%u, count = %u\n", osb->slot_num,
|
|
le16_to_cpu(tl->tl_used), le16_to_cpu(tl->tl_count));
|
|
return le16_to_cpu(tl->tl_used) == le16_to_cpu(tl->tl_count);
|
|
}
|
|
|
|
static int ocfs2_truncate_log_can_coalesce(struct ocfs2_truncate_log *tl,
|
|
unsigned int new_start)
|
|
{
|
|
unsigned int tail_index;
|
|
unsigned int current_tail;
|
|
|
|
/* No records, nothing to coalesce */
|
|
if (!le16_to_cpu(tl->tl_used))
|
|
return 0;
|
|
|
|
tail_index = le16_to_cpu(tl->tl_used) - 1;
|
|
current_tail = le32_to_cpu(tl->tl_recs[tail_index].t_start);
|
|
current_tail += le32_to_cpu(tl->tl_recs[tail_index].t_clusters);
|
|
|
|
return current_tail == new_start;
|
|
}
|
|
|
|
int ocfs2_truncate_log_append(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
u64 start_blk,
|
|
unsigned int num_clusters)
|
|
{
|
|
int status, index;
|
|
unsigned int start_cluster, tl_count;
|
|
struct inode *tl_inode = osb->osb_tl_inode;
|
|
struct buffer_head *tl_bh = osb->osb_tl_bh;
|
|
struct ocfs2_dinode *di;
|
|
struct ocfs2_truncate_log *tl;
|
|
|
|
mlog_entry("start_blk = %llu, num_clusters = %u\n",
|
|
(unsigned long long)start_blk, num_clusters);
|
|
|
|
BUG_ON(mutex_trylock(&tl_inode->i_mutex));
|
|
|
|
start_cluster = ocfs2_blocks_to_clusters(osb->sb, start_blk);
|
|
|
|
di = (struct ocfs2_dinode *) tl_bh->b_data;
|
|
|
|
/* tl_bh is loaded from ocfs2_truncate_log_init(). It's validated
|
|
* by the underlying call to ocfs2_read_inode_block(), so any
|
|
* corruption is a code bug */
|
|
BUG_ON(!OCFS2_IS_VALID_DINODE(di));
|
|
|
|
tl = &di->id2.i_dealloc;
|
|
tl_count = le16_to_cpu(tl->tl_count);
|
|
mlog_bug_on_msg(tl_count > ocfs2_truncate_recs_per_inode(osb->sb) ||
|
|
tl_count == 0,
|
|
"Truncate record count on #%llu invalid "
|
|
"wanted %u, actual %u\n",
|
|
(unsigned long long)OCFS2_I(tl_inode)->ip_blkno,
|
|
ocfs2_truncate_recs_per_inode(osb->sb),
|
|
le16_to_cpu(tl->tl_count));
|
|
|
|
/* Caller should have known to flush before calling us. */
|
|
index = le16_to_cpu(tl->tl_used);
|
|
if (index >= tl_count) {
|
|
status = -ENOSPC;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_journal_access_di(handle, tl_inode, tl_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
mlog(0, "Log truncate of %u clusters starting at cluster %u to "
|
|
"%llu (index = %d)\n", num_clusters, start_cluster,
|
|
(unsigned long long)OCFS2_I(tl_inode)->ip_blkno, index);
|
|
|
|
if (ocfs2_truncate_log_can_coalesce(tl, start_cluster)) {
|
|
/*
|
|
* Move index back to the record we are coalescing with.
|
|
* ocfs2_truncate_log_can_coalesce() guarantees nonzero
|
|
*/
|
|
index--;
|
|
|
|
num_clusters += le32_to_cpu(tl->tl_recs[index].t_clusters);
|
|
mlog(0, "Coalesce with index %u (start = %u, clusters = %u)\n",
|
|
index, le32_to_cpu(tl->tl_recs[index].t_start),
|
|
num_clusters);
|
|
} else {
|
|
tl->tl_recs[index].t_start = cpu_to_le32(start_cluster);
|
|
tl->tl_used = cpu_to_le16(index + 1);
|
|
}
|
|
tl->tl_recs[index].t_clusters = cpu_to_le32(num_clusters);
|
|
|
|
status = ocfs2_journal_dirty(handle, tl_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
bail:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
static int ocfs2_replay_truncate_records(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct inode *data_alloc_inode,
|
|
struct buffer_head *data_alloc_bh)
|
|
{
|
|
int status = 0;
|
|
int i;
|
|
unsigned int num_clusters;
|
|
u64 start_blk;
|
|
struct ocfs2_truncate_rec rec;
|
|
struct ocfs2_dinode *di;
|
|
struct ocfs2_truncate_log *tl;
|
|
struct inode *tl_inode = osb->osb_tl_inode;
|
|
struct buffer_head *tl_bh = osb->osb_tl_bh;
|
|
|
|
mlog_entry_void();
|
|
|
|
di = (struct ocfs2_dinode *) tl_bh->b_data;
|
|
tl = &di->id2.i_dealloc;
|
|
i = le16_to_cpu(tl->tl_used) - 1;
|
|
while (i >= 0) {
|
|
/* Caller has given us at least enough credits to
|
|
* update the truncate log dinode */
|
|
status = ocfs2_journal_access_di(handle, tl_inode, tl_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
tl->tl_used = cpu_to_le16(i);
|
|
|
|
status = ocfs2_journal_dirty(handle, tl_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* TODO: Perhaps we can calculate the bulk of the
|
|
* credits up front rather than extending like
|
|
* this. */
|
|
status = ocfs2_extend_trans(handle,
|
|
OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
rec = tl->tl_recs[i];
|
|
start_blk = ocfs2_clusters_to_blocks(data_alloc_inode->i_sb,
|
|
le32_to_cpu(rec.t_start));
|
|
num_clusters = le32_to_cpu(rec.t_clusters);
|
|
|
|
/* if start_blk is not set, we ignore the record as
|
|
* invalid. */
|
|
if (start_blk) {
|
|
mlog(0, "free record %d, start = %u, clusters = %u\n",
|
|
i, le32_to_cpu(rec.t_start), num_clusters);
|
|
|
|
status = ocfs2_free_clusters(handle, data_alloc_inode,
|
|
data_alloc_bh, start_blk,
|
|
num_clusters);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
i--;
|
|
}
|
|
|
|
bail:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/* Expects you to already be holding tl_inode->i_mutex */
|
|
int __ocfs2_flush_truncate_log(struct ocfs2_super *osb)
|
|
{
|
|
int status;
|
|
unsigned int num_to_flush;
|
|
handle_t *handle;
|
|
struct inode *tl_inode = osb->osb_tl_inode;
|
|
struct inode *data_alloc_inode = NULL;
|
|
struct buffer_head *tl_bh = osb->osb_tl_bh;
|
|
struct buffer_head *data_alloc_bh = NULL;
|
|
struct ocfs2_dinode *di;
|
|
struct ocfs2_truncate_log *tl;
|
|
|
|
mlog_entry_void();
|
|
|
|
BUG_ON(mutex_trylock(&tl_inode->i_mutex));
|
|
|
|
di = (struct ocfs2_dinode *) tl_bh->b_data;
|
|
|
|
/* tl_bh is loaded from ocfs2_truncate_log_init(). It's validated
|
|
* by the underlying call to ocfs2_read_inode_block(), so any
|
|
* corruption is a code bug */
|
|
BUG_ON(!OCFS2_IS_VALID_DINODE(di));
|
|
|
|
tl = &di->id2.i_dealloc;
|
|
num_to_flush = le16_to_cpu(tl->tl_used);
|
|
mlog(0, "Flush %u records from truncate log #%llu\n",
|
|
num_to_flush, (unsigned long long)OCFS2_I(tl_inode)->ip_blkno);
|
|
if (!num_to_flush) {
|
|
status = 0;
|
|
goto out;
|
|
}
|
|
|
|
data_alloc_inode = ocfs2_get_system_file_inode(osb,
|
|
GLOBAL_BITMAP_SYSTEM_INODE,
|
|
OCFS2_INVALID_SLOT);
|
|
if (!data_alloc_inode) {
|
|
status = -EINVAL;
|
|
mlog(ML_ERROR, "Could not get bitmap inode!\n");
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&data_alloc_inode->i_mutex);
|
|
|
|
status = ocfs2_inode_lock(data_alloc_inode, &data_alloc_bh, 1);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto out_mutex;
|
|
}
|
|
|
|
handle = ocfs2_start_trans(osb, OCFS2_TRUNCATE_LOG_UPDATE);
|
|
if (IS_ERR(handle)) {
|
|
status = PTR_ERR(handle);
|
|
mlog_errno(status);
|
|
goto out_unlock;
|
|
}
|
|
|
|
status = ocfs2_replay_truncate_records(osb, handle, data_alloc_inode,
|
|
data_alloc_bh);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
out_unlock:
|
|
brelse(data_alloc_bh);
|
|
ocfs2_inode_unlock(data_alloc_inode, 1);
|
|
|
|
out_mutex:
|
|
mutex_unlock(&data_alloc_inode->i_mutex);
|
|
iput(data_alloc_inode);
|
|
|
|
out:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_flush_truncate_log(struct ocfs2_super *osb)
|
|
{
|
|
int status;
|
|
struct inode *tl_inode = osb->osb_tl_inode;
|
|
|
|
mutex_lock(&tl_inode->i_mutex);
|
|
status = __ocfs2_flush_truncate_log(osb);
|
|
mutex_unlock(&tl_inode->i_mutex);
|
|
|
|
return status;
|
|
}
|
|
|
|
static void ocfs2_truncate_log_worker(struct work_struct *work)
|
|
{
|
|
int status;
|
|
struct ocfs2_super *osb =
|
|
container_of(work, struct ocfs2_super,
|
|
osb_truncate_log_wq.work);
|
|
|
|
mlog_entry_void();
|
|
|
|
status = ocfs2_flush_truncate_log(osb);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
else
|
|
ocfs2_init_inode_steal_slot(osb);
|
|
|
|
mlog_exit(status);
|
|
}
|
|
|
|
#define OCFS2_TRUNCATE_LOG_FLUSH_INTERVAL (2 * HZ)
|
|
void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb,
|
|
int cancel)
|
|
{
|
|
if (osb->osb_tl_inode) {
|
|
/* We want to push off log flushes while truncates are
|
|
* still running. */
|
|
if (cancel)
|
|
cancel_delayed_work(&osb->osb_truncate_log_wq);
|
|
|
|
queue_delayed_work(ocfs2_wq, &osb->osb_truncate_log_wq,
|
|
OCFS2_TRUNCATE_LOG_FLUSH_INTERVAL);
|
|
}
|
|
}
|
|
|
|
static int ocfs2_get_truncate_log_info(struct ocfs2_super *osb,
|
|
int slot_num,
|
|
struct inode **tl_inode,
|
|
struct buffer_head **tl_bh)
|
|
{
|
|
int status;
|
|
struct inode *inode = NULL;
|
|
struct buffer_head *bh = NULL;
|
|
|
|
inode = ocfs2_get_system_file_inode(osb,
|
|
TRUNCATE_LOG_SYSTEM_INODE,
|
|
slot_num);
|
|
if (!inode) {
|
|
status = -EINVAL;
|
|
mlog(ML_ERROR, "Could not get load truncate log inode!\n");
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_read_inode_block(inode, &bh);
|
|
if (status < 0) {
|
|
iput(inode);
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
*tl_inode = inode;
|
|
*tl_bh = bh;
|
|
bail:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/* called during the 1st stage of node recovery. we stamp a clean
|
|
* truncate log and pass back a copy for processing later. if the
|
|
* truncate log does not require processing, a *tl_copy is set to
|
|
* NULL. */
|
|
int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
|
|
int slot_num,
|
|
struct ocfs2_dinode **tl_copy)
|
|
{
|
|
int status;
|
|
struct inode *tl_inode = NULL;
|
|
struct buffer_head *tl_bh = NULL;
|
|
struct ocfs2_dinode *di;
|
|
struct ocfs2_truncate_log *tl;
|
|
|
|
*tl_copy = NULL;
|
|
|
|
mlog(0, "recover truncate log from slot %d\n", slot_num);
|
|
|
|
status = ocfs2_get_truncate_log_info(osb, slot_num, &tl_inode, &tl_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
di = (struct ocfs2_dinode *) tl_bh->b_data;
|
|
|
|
/* tl_bh is loaded from ocfs2_get_truncate_log_info(). It's
|
|
* validated by the underlying call to ocfs2_read_inode_block(),
|
|
* so any corruption is a code bug */
|
|
BUG_ON(!OCFS2_IS_VALID_DINODE(di));
|
|
|
|
tl = &di->id2.i_dealloc;
|
|
if (le16_to_cpu(tl->tl_used)) {
|
|
mlog(0, "We'll have %u logs to recover\n",
|
|
le16_to_cpu(tl->tl_used));
|
|
|
|
*tl_copy = kmalloc(tl_bh->b_size, GFP_KERNEL);
|
|
if (!(*tl_copy)) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* Assuming the write-out below goes well, this copy
|
|
* will be passed back to recovery for processing. */
|
|
memcpy(*tl_copy, tl_bh->b_data, tl_bh->b_size);
|
|
|
|
/* All we need to do to clear the truncate log is set
|
|
* tl_used. */
|
|
tl->tl_used = 0;
|
|
|
|
ocfs2_compute_meta_ecc(osb->sb, tl_bh->b_data, &di->i_check);
|
|
status = ocfs2_write_block(osb, tl_bh, tl_inode);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
bail:
|
|
if (tl_inode)
|
|
iput(tl_inode);
|
|
brelse(tl_bh);
|
|
|
|
if (status < 0 && (*tl_copy)) {
|
|
kfree(*tl_copy);
|
|
*tl_copy = NULL;
|
|
}
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
|
|
struct ocfs2_dinode *tl_copy)
|
|
{
|
|
int status = 0;
|
|
int i;
|
|
unsigned int clusters, num_recs, start_cluster;
|
|
u64 start_blk;
|
|
handle_t *handle;
|
|
struct inode *tl_inode = osb->osb_tl_inode;
|
|
struct ocfs2_truncate_log *tl;
|
|
|
|
mlog_entry_void();
|
|
|
|
if (OCFS2_I(tl_inode)->ip_blkno == le64_to_cpu(tl_copy->i_blkno)) {
|
|
mlog(ML_ERROR, "Asked to recover my own truncate log!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
tl = &tl_copy->id2.i_dealloc;
|
|
num_recs = le16_to_cpu(tl->tl_used);
|
|
mlog(0, "cleanup %u records from %llu\n", num_recs,
|
|
(unsigned long long)le64_to_cpu(tl_copy->i_blkno));
|
|
|
|
mutex_lock(&tl_inode->i_mutex);
|
|
for(i = 0; i < num_recs; i++) {
|
|
if (ocfs2_truncate_log_needs_flush(osb)) {
|
|
status = __ocfs2_flush_truncate_log(osb);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail_up;
|
|
}
|
|
}
|
|
|
|
handle = ocfs2_start_trans(osb, OCFS2_TRUNCATE_LOG_UPDATE);
|
|
if (IS_ERR(handle)) {
|
|
status = PTR_ERR(handle);
|
|
mlog_errno(status);
|
|
goto bail_up;
|
|
}
|
|
|
|
clusters = le32_to_cpu(tl->tl_recs[i].t_clusters);
|
|
start_cluster = le32_to_cpu(tl->tl_recs[i].t_start);
|
|
start_blk = ocfs2_clusters_to_blocks(osb->sb, start_cluster);
|
|
|
|
status = ocfs2_truncate_log_append(osb, handle,
|
|
start_blk, clusters);
|
|
ocfs2_commit_trans(osb, handle);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail_up;
|
|
}
|
|
}
|
|
|
|
bail_up:
|
|
mutex_unlock(&tl_inode->i_mutex);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb)
|
|
{
|
|
int status;
|
|
struct inode *tl_inode = osb->osb_tl_inode;
|
|
|
|
mlog_entry_void();
|
|
|
|
if (tl_inode) {
|
|
cancel_delayed_work(&osb->osb_truncate_log_wq);
|
|
flush_workqueue(ocfs2_wq);
|
|
|
|
status = ocfs2_flush_truncate_log(osb);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
brelse(osb->osb_tl_bh);
|
|
iput(osb->osb_tl_inode);
|
|
}
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
int ocfs2_truncate_log_init(struct ocfs2_super *osb)
|
|
{
|
|
int status;
|
|
struct inode *tl_inode = NULL;
|
|
struct buffer_head *tl_bh = NULL;
|
|
|
|
mlog_entry_void();
|
|
|
|
status = ocfs2_get_truncate_log_info(osb,
|
|
osb->slot_num,
|
|
&tl_inode,
|
|
&tl_bh);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
/* ocfs2_truncate_log_shutdown keys on the existence of
|
|
* osb->osb_tl_inode so we don't set any of the osb variables
|
|
* until we're sure all is well. */
|
|
INIT_DELAYED_WORK(&osb->osb_truncate_log_wq,
|
|
ocfs2_truncate_log_worker);
|
|
osb->osb_tl_bh = tl_bh;
|
|
osb->osb_tl_inode = tl_inode;
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Delayed de-allocation of suballocator blocks.
|
|
*
|
|
* Some sets of block de-allocations might involve multiple suballocator inodes.
|
|
*
|
|
* The locking for this can get extremely complicated, especially when
|
|
* the suballocator inodes to delete from aren't known until deep
|
|
* within an unrelated codepath.
|
|
*
|
|
* ocfs2_extent_block structures are a good example of this - an inode
|
|
* btree could have been grown by any number of nodes each allocating
|
|
* out of their own suballoc inode.
|
|
*
|
|
* These structures allow the delay of block de-allocation until a
|
|
* later time, when locking of multiple cluster inodes won't cause
|
|
* deadlock.
|
|
*/
|
|
|
|
/*
|
|
* Describe a single bit freed from a suballocator. For the block
|
|
* suballocators, it represents one block. For the global cluster
|
|
* allocator, it represents some clusters and free_bit indicates
|
|
* clusters number.
|
|
*/
|
|
struct ocfs2_cached_block_free {
|
|
struct ocfs2_cached_block_free *free_next;
|
|
u64 free_blk;
|
|
unsigned int free_bit;
|
|
};
|
|
|
|
struct ocfs2_per_slot_free_list {
|
|
struct ocfs2_per_slot_free_list *f_next_suballocator;
|
|
int f_inode_type;
|
|
int f_slot;
|
|
struct ocfs2_cached_block_free *f_first;
|
|
};
|
|
|
|
static int ocfs2_free_cached_blocks(struct ocfs2_super *osb,
|
|
int sysfile_type,
|
|
int slot,
|
|
struct ocfs2_cached_block_free *head)
|
|
{
|
|
int ret;
|
|
u64 bg_blkno;
|
|
handle_t *handle;
|
|
struct inode *inode;
|
|
struct buffer_head *di_bh = NULL;
|
|
struct ocfs2_cached_block_free *tmp;
|
|
|
|
inode = ocfs2_get_system_file_inode(osb, sysfile_type, slot);
|
|
if (!inode) {
|
|
ret = -EINVAL;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
|
|
ret = ocfs2_inode_lock(inode, &di_bh, 1);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_mutex;
|
|
}
|
|
|
|
handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
|
|
if (IS_ERR(handle)) {
|
|
ret = PTR_ERR(handle);
|
|
mlog_errno(ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
while (head) {
|
|
bg_blkno = ocfs2_which_suballoc_group(head->free_blk,
|
|
head->free_bit);
|
|
mlog(0, "Free bit: (bit %u, blkno %llu)\n",
|
|
head->free_bit, (unsigned long long)head->free_blk);
|
|
|
|
ret = ocfs2_free_suballoc_bits(handle, inode, di_bh,
|
|
head->free_bit, bg_blkno, 1);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_journal;
|
|
}
|
|
|
|
ret = ocfs2_extend_trans(handle, OCFS2_SUBALLOC_FREE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_journal;
|
|
}
|
|
|
|
tmp = head;
|
|
head = head->free_next;
|
|
kfree(tmp);
|
|
}
|
|
|
|
out_journal:
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
out_unlock:
|
|
ocfs2_inode_unlock(inode, 1);
|
|
brelse(di_bh);
|
|
out_mutex:
|
|
mutex_unlock(&inode->i_mutex);
|
|
iput(inode);
|
|
out:
|
|
while(head) {
|
|
/* Premature exit may have left some dangling items. */
|
|
tmp = head;
|
|
head = head->free_next;
|
|
kfree(tmp);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_cache_cluster_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
|
|
u64 blkno, unsigned int bit)
|
|
{
|
|
int ret = 0;
|
|
struct ocfs2_cached_block_free *item;
|
|
|
|
item = kmalloc(sizeof(*item), GFP_NOFS);
|
|
if (item == NULL) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
return ret;
|
|
}
|
|
|
|
mlog(0, "Insert clusters: (bit %u, blk %llu)\n",
|
|
bit, (unsigned long long)blkno);
|
|
|
|
item->free_blk = blkno;
|
|
item->free_bit = bit;
|
|
item->free_next = ctxt->c_global_allocator;
|
|
|
|
ctxt->c_global_allocator = item;
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_free_cached_clusters(struct ocfs2_super *osb,
|
|
struct ocfs2_cached_block_free *head)
|
|
{
|
|
struct ocfs2_cached_block_free *tmp;
|
|
struct inode *tl_inode = osb->osb_tl_inode;
|
|
handle_t *handle;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&tl_inode->i_mutex);
|
|
|
|
while (head) {
|
|
if (ocfs2_truncate_log_needs_flush(osb)) {
|
|
ret = __ocfs2_flush_truncate_log(osb);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
break;
|
|
}
|
|
}
|
|
|
|
handle = ocfs2_start_trans(osb, OCFS2_TRUNCATE_LOG_UPDATE);
|
|
if (IS_ERR(handle)) {
|
|
ret = PTR_ERR(handle);
|
|
mlog_errno(ret);
|
|
break;
|
|
}
|
|
|
|
ret = ocfs2_truncate_log_append(osb, handle, head->free_blk,
|
|
head->free_bit);
|
|
|
|
ocfs2_commit_trans(osb, handle);
|
|
tmp = head;
|
|
head = head->free_next;
|
|
kfree(tmp);
|
|
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
break;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&tl_inode->i_mutex);
|
|
|
|
while (head) {
|
|
/* Premature exit may have left some dangling items. */
|
|
tmp = head;
|
|
head = head->free_next;
|
|
kfree(tmp);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_run_deallocs(struct ocfs2_super *osb,
|
|
struct ocfs2_cached_dealloc_ctxt *ctxt)
|
|
{
|
|
int ret = 0, ret2;
|
|
struct ocfs2_per_slot_free_list *fl;
|
|
|
|
if (!ctxt)
|
|
return 0;
|
|
|
|
while (ctxt->c_first_suballocator) {
|
|
fl = ctxt->c_first_suballocator;
|
|
|
|
if (fl->f_first) {
|
|
mlog(0, "Free items: (type %u, slot %d)\n",
|
|
fl->f_inode_type, fl->f_slot);
|
|
ret2 = ocfs2_free_cached_blocks(osb,
|
|
fl->f_inode_type,
|
|
fl->f_slot,
|
|
fl->f_first);
|
|
if (ret2)
|
|
mlog_errno(ret2);
|
|
if (!ret)
|
|
ret = ret2;
|
|
}
|
|
|
|
ctxt->c_first_suballocator = fl->f_next_suballocator;
|
|
kfree(fl);
|
|
}
|
|
|
|
if (ctxt->c_global_allocator) {
|
|
ret2 = ocfs2_free_cached_clusters(osb,
|
|
ctxt->c_global_allocator);
|
|
if (ret2)
|
|
mlog_errno(ret2);
|
|
if (!ret)
|
|
ret = ret2;
|
|
|
|
ctxt->c_global_allocator = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct ocfs2_per_slot_free_list *
|
|
ocfs2_find_per_slot_free_list(int type,
|
|
int slot,
|
|
struct ocfs2_cached_dealloc_ctxt *ctxt)
|
|
{
|
|
struct ocfs2_per_slot_free_list *fl = ctxt->c_first_suballocator;
|
|
|
|
while (fl) {
|
|
if (fl->f_inode_type == type && fl->f_slot == slot)
|
|
return fl;
|
|
|
|
fl = fl->f_next_suballocator;
|
|
}
|
|
|
|
fl = kmalloc(sizeof(*fl), GFP_NOFS);
|
|
if (fl) {
|
|
fl->f_inode_type = type;
|
|
fl->f_slot = slot;
|
|
fl->f_first = NULL;
|
|
fl->f_next_suballocator = ctxt->c_first_suballocator;
|
|
|
|
ctxt->c_first_suballocator = fl;
|
|
}
|
|
return fl;
|
|
}
|
|
|
|
static int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
|
|
int type, int slot, u64 blkno,
|
|
unsigned int bit)
|
|
{
|
|
int ret;
|
|
struct ocfs2_per_slot_free_list *fl;
|
|
struct ocfs2_cached_block_free *item;
|
|
|
|
fl = ocfs2_find_per_slot_free_list(type, slot, ctxt);
|
|
if (fl == NULL) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
item = kmalloc(sizeof(*item), GFP_NOFS);
|
|
if (item == NULL) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
mlog(0, "Insert: (type %d, slot %u, bit %u, blk %llu)\n",
|
|
type, slot, bit, (unsigned long long)blkno);
|
|
|
|
item->free_blk = blkno;
|
|
item->free_bit = bit;
|
|
item->free_next = fl->f_first;
|
|
|
|
fl->f_first = item;
|
|
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_cache_extent_block_free(struct ocfs2_cached_dealloc_ctxt *ctxt,
|
|
struct ocfs2_extent_block *eb)
|
|
{
|
|
return ocfs2_cache_block_dealloc(ctxt, EXTENT_ALLOC_SYSTEM_INODE,
|
|
le16_to_cpu(eb->h_suballoc_slot),
|
|
le64_to_cpu(eb->h_blkno),
|
|
le16_to_cpu(eb->h_suballoc_bit));
|
|
}
|
|
|
|
/* This function will figure out whether the currently last extent
|
|
* block will be deleted, and if it will, what the new last extent
|
|
* block will be so we can update his h_next_leaf_blk field, as well
|
|
* as the dinodes i_last_eb_blk */
|
|
static int ocfs2_find_new_last_ext_blk(struct inode *inode,
|
|
unsigned int clusters_to_del,
|
|
struct ocfs2_path *path,
|
|
struct buffer_head **new_last_eb)
|
|
{
|
|
int next_free, ret = 0;
|
|
u32 cpos;
|
|
struct ocfs2_extent_rec *rec;
|
|
struct ocfs2_extent_block *eb;
|
|
struct ocfs2_extent_list *el;
|
|
struct buffer_head *bh = NULL;
|
|
|
|
*new_last_eb = NULL;
|
|
|
|
/* we have no tree, so of course, no last_eb. */
|
|
if (!path->p_tree_depth)
|
|
goto out;
|
|
|
|
/* trunc to zero special case - this makes tree_depth = 0
|
|
* regardless of what it is. */
|
|
if (OCFS2_I(inode)->ip_clusters == clusters_to_del)
|
|
goto out;
|
|
|
|
el = path_leaf_el(path);
|
|
BUG_ON(!el->l_next_free_rec);
|
|
|
|
/*
|
|
* Make sure that this extent list will actually be empty
|
|
* after we clear away the data. We can shortcut out if
|
|
* there's more than one non-empty extent in the
|
|
* list. Otherwise, a check of the remaining extent is
|
|
* necessary.
|
|
*/
|
|
next_free = le16_to_cpu(el->l_next_free_rec);
|
|
rec = NULL;
|
|
if (ocfs2_is_empty_extent(&el->l_recs[0])) {
|
|
if (next_free > 2)
|
|
goto out;
|
|
|
|
/* We may have a valid extent in index 1, check it. */
|
|
if (next_free == 2)
|
|
rec = &el->l_recs[1];
|
|
|
|
/*
|
|
* Fall through - no more nonempty extents, so we want
|
|
* to delete this leaf.
|
|
*/
|
|
} else {
|
|
if (next_free > 1)
|
|
goto out;
|
|
|
|
rec = &el->l_recs[0];
|
|
}
|
|
|
|
if (rec) {
|
|
/*
|
|
* Check it we'll only be trimming off the end of this
|
|
* cluster.
|
|
*/
|
|
if (le16_to_cpu(rec->e_leaf_clusters) > clusters_to_del)
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, path, &cpos);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_find_leaf(inode, path_root_el(path), cpos, &bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
eb = (struct ocfs2_extent_block *) bh->b_data;
|
|
el = &eb->h_list;
|
|
|
|
/* ocfs2_find_leaf() gets the eb from ocfs2_read_extent_block().
|
|
* Any corruption is a code bug. */
|
|
BUG_ON(!OCFS2_IS_VALID_EXTENT_BLOCK(eb));
|
|
|
|
*new_last_eb = bh;
|
|
get_bh(*new_last_eb);
|
|
mlog(0, "returning block %llu, (cpos: %u)\n",
|
|
(unsigned long long)le64_to_cpu(eb->h_blkno), cpos);
|
|
out:
|
|
brelse(bh);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Trim some clusters off the rightmost edge of a tree. Only called
|
|
* during truncate.
|
|
*
|
|
* The caller needs to:
|
|
* - start journaling of each path component.
|
|
* - compute and fully set up any new last ext block
|
|
*/
|
|
static int ocfs2_trim_tree(struct inode *inode, struct ocfs2_path *path,
|
|
handle_t *handle, struct ocfs2_truncate_context *tc,
|
|
u32 clusters_to_del, u64 *delete_start)
|
|
{
|
|
int ret, i, index = path->p_tree_depth;
|
|
u32 new_edge = 0;
|
|
u64 deleted_eb = 0;
|
|
struct buffer_head *bh;
|
|
struct ocfs2_extent_list *el;
|
|
struct ocfs2_extent_rec *rec;
|
|
|
|
*delete_start = 0;
|
|
|
|
while (index >= 0) {
|
|
bh = path->p_node[index].bh;
|
|
el = path->p_node[index].el;
|
|
|
|
mlog(0, "traveling tree (index = %d, block = %llu)\n",
|
|
index, (unsigned long long)bh->b_blocknr);
|
|
|
|
BUG_ON(le16_to_cpu(el->l_next_free_rec) == 0);
|
|
|
|
if (index !=
|
|
(path->p_tree_depth - le16_to_cpu(el->l_tree_depth))) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %lu has invalid ext. block %llu",
|
|
inode->i_ino,
|
|
(unsigned long long)bh->b_blocknr);
|
|
ret = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
find_tail_record:
|
|
i = le16_to_cpu(el->l_next_free_rec) - 1;
|
|
rec = &el->l_recs[i];
|
|
|
|
mlog(0, "Extent list before: record %d: (%u, %u, %llu), "
|
|
"next = %u\n", i, le32_to_cpu(rec->e_cpos),
|
|
ocfs2_rec_clusters(el, rec),
|
|
(unsigned long long)le64_to_cpu(rec->e_blkno),
|
|
le16_to_cpu(el->l_next_free_rec));
|
|
|
|
BUG_ON(ocfs2_rec_clusters(el, rec) < clusters_to_del);
|
|
|
|
if (le16_to_cpu(el->l_tree_depth) == 0) {
|
|
/*
|
|
* If the leaf block contains a single empty
|
|
* extent and no records, we can just remove
|
|
* the block.
|
|
*/
|
|
if (i == 0 && ocfs2_is_empty_extent(rec)) {
|
|
memset(rec, 0,
|
|
sizeof(struct ocfs2_extent_rec));
|
|
el->l_next_free_rec = cpu_to_le16(0);
|
|
|
|
goto delete;
|
|
}
|
|
|
|
/*
|
|
* Remove any empty extents by shifting things
|
|
* left. That should make life much easier on
|
|
* the code below. This condition is rare
|
|
* enough that we shouldn't see a performance
|
|
* hit.
|
|
*/
|
|
if (ocfs2_is_empty_extent(&el->l_recs[0])) {
|
|
le16_add_cpu(&el->l_next_free_rec, -1);
|
|
|
|
for(i = 0;
|
|
i < le16_to_cpu(el->l_next_free_rec); i++)
|
|
el->l_recs[i] = el->l_recs[i + 1];
|
|
|
|
memset(&el->l_recs[i], 0,
|
|
sizeof(struct ocfs2_extent_rec));
|
|
|
|
/*
|
|
* We've modified our extent list. The
|
|
* simplest way to handle this change
|
|
* is to being the search from the
|
|
* start again.
|
|
*/
|
|
goto find_tail_record;
|
|
}
|
|
|
|
le16_add_cpu(&rec->e_leaf_clusters, -clusters_to_del);
|
|
|
|
/*
|
|
* We'll use "new_edge" on our way back up the
|
|
* tree to know what our rightmost cpos is.
|
|
*/
|
|
new_edge = le16_to_cpu(rec->e_leaf_clusters);
|
|
new_edge += le32_to_cpu(rec->e_cpos);
|
|
|
|
/*
|
|
* The caller will use this to delete data blocks.
|
|
*/
|
|
*delete_start = le64_to_cpu(rec->e_blkno)
|
|
+ ocfs2_clusters_to_blocks(inode->i_sb,
|
|
le16_to_cpu(rec->e_leaf_clusters));
|
|
|
|
/*
|
|
* If it's now empty, remove this record.
|
|
*/
|
|
if (le16_to_cpu(rec->e_leaf_clusters) == 0) {
|
|
memset(rec, 0,
|
|
sizeof(struct ocfs2_extent_rec));
|
|
le16_add_cpu(&el->l_next_free_rec, -1);
|
|
}
|
|
} else {
|
|
if (le64_to_cpu(rec->e_blkno) == deleted_eb) {
|
|
memset(rec, 0,
|
|
sizeof(struct ocfs2_extent_rec));
|
|
le16_add_cpu(&el->l_next_free_rec, -1);
|
|
|
|
goto delete;
|
|
}
|
|
|
|
/* Can this actually happen? */
|
|
if (le16_to_cpu(el->l_next_free_rec) == 0)
|
|
goto delete;
|
|
|
|
/*
|
|
* We never actually deleted any clusters
|
|
* because our leaf was empty. There's no
|
|
* reason to adjust the rightmost edge then.
|
|
*/
|
|
if (new_edge == 0)
|
|
goto delete;
|
|
|
|
rec->e_int_clusters = cpu_to_le32(new_edge);
|
|
le32_add_cpu(&rec->e_int_clusters,
|
|
-le32_to_cpu(rec->e_cpos));
|
|
|
|
/*
|
|
* A deleted child record should have been
|
|
* caught above.
|
|
*/
|
|
BUG_ON(le32_to_cpu(rec->e_int_clusters) == 0);
|
|
}
|
|
|
|
delete:
|
|
ret = ocfs2_journal_dirty(handle, bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
mlog(0, "extent list container %llu, after: record %d: "
|
|
"(%u, %u, %llu), next = %u.\n",
|
|
(unsigned long long)bh->b_blocknr, i,
|
|
le32_to_cpu(rec->e_cpos), ocfs2_rec_clusters(el, rec),
|
|
(unsigned long long)le64_to_cpu(rec->e_blkno),
|
|
le16_to_cpu(el->l_next_free_rec));
|
|
|
|
/*
|
|
* We must be careful to only attempt delete of an
|
|
* extent block (and not the root inode block).
|
|
*/
|
|
if (index > 0 && le16_to_cpu(el->l_next_free_rec) == 0) {
|
|
struct ocfs2_extent_block *eb =
|
|
(struct ocfs2_extent_block *)bh->b_data;
|
|
|
|
/*
|
|
* Save this for use when processing the
|
|
* parent block.
|
|
*/
|
|
deleted_eb = le64_to_cpu(eb->h_blkno);
|
|
|
|
mlog(0, "deleting this extent block.\n");
|
|
|
|
ocfs2_remove_from_cache(inode, bh);
|
|
|
|
BUG_ON(ocfs2_rec_clusters(el, &el->l_recs[0]));
|
|
BUG_ON(le32_to_cpu(el->l_recs[0].e_cpos));
|
|
BUG_ON(le64_to_cpu(el->l_recs[0].e_blkno));
|
|
|
|
ret = ocfs2_cache_extent_block_free(&tc->tc_dealloc, eb);
|
|
/* An error here is not fatal. */
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
} else {
|
|
deleted_eb = 0;
|
|
}
|
|
|
|
index--;
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_do_truncate(struct ocfs2_super *osb,
|
|
unsigned int clusters_to_del,
|
|
struct inode *inode,
|
|
struct buffer_head *fe_bh,
|
|
handle_t *handle,
|
|
struct ocfs2_truncate_context *tc,
|
|
struct ocfs2_path *path)
|
|
{
|
|
int status;
|
|
struct ocfs2_dinode *fe;
|
|
struct ocfs2_extent_block *last_eb = NULL;
|
|
struct ocfs2_extent_list *el;
|
|
struct buffer_head *last_eb_bh = NULL;
|
|
u64 delete_blk = 0;
|
|
|
|
fe = (struct ocfs2_dinode *) fe_bh->b_data;
|
|
|
|
status = ocfs2_find_new_last_ext_blk(inode, clusters_to_del,
|
|
path, &last_eb_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Each component will be touched, so we might as well journal
|
|
* here to avoid having to handle errors later.
|
|
*/
|
|
status = ocfs2_journal_access_path(inode, handle, path);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
if (last_eb_bh) {
|
|
status = ocfs2_journal_access_eb(handle, inode, last_eb_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
last_eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
|
|
}
|
|
|
|
el = &(fe->id2.i_list);
|
|
|
|
/*
|
|
* Lower levels depend on this never happening, but it's best
|
|
* to check it up here before changing the tree.
|
|
*/
|
|
if (el->l_tree_depth && el->l_recs[0].e_int_clusters == 0) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %lu has an empty extent record, depth %u\n",
|
|
inode->i_ino, le16_to_cpu(el->l_tree_depth));
|
|
status = -EROFS;
|
|
goto bail;
|
|
}
|
|
|
|
vfs_dq_free_space_nodirty(inode,
|
|
ocfs2_clusters_to_bytes(osb->sb, clusters_to_del));
|
|
spin_lock(&OCFS2_I(inode)->ip_lock);
|
|
OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters) -
|
|
clusters_to_del;
|
|
spin_unlock(&OCFS2_I(inode)->ip_lock);
|
|
le32_add_cpu(&fe->i_clusters, -clusters_to_del);
|
|
inode->i_blocks = ocfs2_inode_sector_count(inode);
|
|
|
|
status = ocfs2_trim_tree(inode, path, handle, tc,
|
|
clusters_to_del, &delete_blk);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
if (le32_to_cpu(fe->i_clusters) == 0) {
|
|
/* trunc to zero is a special case. */
|
|
el->l_tree_depth = 0;
|
|
fe->i_last_eb_blk = 0;
|
|
} else if (last_eb)
|
|
fe->i_last_eb_blk = last_eb->h_blkno;
|
|
|
|
status = ocfs2_journal_dirty(handle, fe_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
if (last_eb) {
|
|
/* If there will be a new last extent block, then by
|
|
* definition, there cannot be any leaves to the right of
|
|
* him. */
|
|
last_eb->h_next_leaf_blk = 0;
|
|
status = ocfs2_journal_dirty(handle, last_eb_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
if (delete_blk) {
|
|
status = ocfs2_truncate_log_append(osb, handle, delete_blk,
|
|
clusters_to_del);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
status = 0;
|
|
bail:
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
static int ocfs2_zero_func(handle_t *handle, struct buffer_head *bh)
|
|
{
|
|
set_buffer_uptodate(bh);
|
|
mark_buffer_dirty(bh);
|
|
return 0;
|
|
}
|
|
|
|
static void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
|
|
unsigned int from, unsigned int to,
|
|
struct page *page, int zero, u64 *phys)
|
|
{
|
|
int ret, partial = 0;
|
|
|
|
ret = ocfs2_map_page_blocks(page, phys, inode, from, to, 0);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
if (zero)
|
|
zero_user_segment(page, from, to);
|
|
|
|
/*
|
|
* Need to set the buffers we zero'd into uptodate
|
|
* here if they aren't - ocfs2_map_page_blocks()
|
|
* might've skipped some
|
|
*/
|
|
ret = walk_page_buffers(handle, page_buffers(page),
|
|
from, to, &partial,
|
|
ocfs2_zero_func);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
else if (ocfs2_should_order_data(inode)) {
|
|
ret = ocfs2_jbd2_file_inode(handle, inode);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
if (!partial)
|
|
SetPageUptodate(page);
|
|
|
|
flush_dcache_page(page);
|
|
}
|
|
|
|
static void ocfs2_zero_cluster_pages(struct inode *inode, loff_t start,
|
|
loff_t end, struct page **pages,
|
|
int numpages, u64 phys, handle_t *handle)
|
|
{
|
|
int i;
|
|
struct page *page;
|
|
unsigned int from, to = PAGE_CACHE_SIZE;
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(sb)));
|
|
|
|
if (numpages == 0)
|
|
goto out;
|
|
|
|
to = PAGE_CACHE_SIZE;
|
|
for(i = 0; i < numpages; i++) {
|
|
page = pages[i];
|
|
|
|
from = start & (PAGE_CACHE_SIZE - 1);
|
|
if ((end >> PAGE_CACHE_SHIFT) == page->index)
|
|
to = end & (PAGE_CACHE_SIZE - 1);
|
|
|
|
BUG_ON(from > PAGE_CACHE_SIZE);
|
|
BUG_ON(to > PAGE_CACHE_SIZE);
|
|
|
|
ocfs2_map_and_dirty_page(inode, handle, from, to, page, 1,
|
|
&phys);
|
|
|
|
start = (page->index + 1) << PAGE_CACHE_SHIFT;
|
|
}
|
|
out:
|
|
if (pages)
|
|
ocfs2_unlock_and_free_pages(pages, numpages);
|
|
}
|
|
|
|
static int ocfs2_grab_eof_pages(struct inode *inode, loff_t start, loff_t end,
|
|
struct page **pages, int *num)
|
|
{
|
|
int numpages, ret = 0;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct address_space *mapping = inode->i_mapping;
|
|
unsigned long index;
|
|
loff_t last_page_bytes;
|
|
|
|
BUG_ON(start > end);
|
|
|
|
BUG_ON(start >> OCFS2_SB(sb)->s_clustersize_bits !=
|
|
(end - 1) >> OCFS2_SB(sb)->s_clustersize_bits);
|
|
|
|
numpages = 0;
|
|
last_page_bytes = PAGE_ALIGN(end);
|
|
index = start >> PAGE_CACHE_SHIFT;
|
|
do {
|
|
pages[numpages] = grab_cache_page(mapping, index);
|
|
if (!pages[numpages]) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
numpages++;
|
|
index++;
|
|
} while (index < (last_page_bytes >> PAGE_CACHE_SHIFT));
|
|
|
|
out:
|
|
if (ret != 0) {
|
|
if (pages)
|
|
ocfs2_unlock_and_free_pages(pages, numpages);
|
|
numpages = 0;
|
|
}
|
|
|
|
*num = numpages;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Zero the area past i_size but still within an allocated
|
|
* cluster. This avoids exposing nonzero data on subsequent file
|
|
* extends.
|
|
*
|
|
* We need to call this before i_size is updated on the inode because
|
|
* otherwise block_write_full_page() will skip writeout of pages past
|
|
* i_size. The new_i_size parameter is passed for this reason.
|
|
*/
|
|
int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle,
|
|
u64 range_start, u64 range_end)
|
|
{
|
|
int ret = 0, numpages;
|
|
struct page **pages = NULL;
|
|
u64 phys;
|
|
unsigned int ext_flags;
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
/*
|
|
* File systems which don't support sparse files zero on every
|
|
* extend.
|
|
*/
|
|
if (!ocfs2_sparse_alloc(OCFS2_SB(sb)))
|
|
return 0;
|
|
|
|
pages = kcalloc(ocfs2_pages_per_cluster(sb),
|
|
sizeof(struct page *), GFP_NOFS);
|
|
if (pages == NULL) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (range_start == range_end)
|
|
goto out;
|
|
|
|
ret = ocfs2_extent_map_get_blocks(inode,
|
|
range_start >> sb->s_blocksize_bits,
|
|
&phys, NULL, &ext_flags);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Tail is a hole, or is marked unwritten. In either case, we
|
|
* can count on read and write to return/push zero's.
|
|
*/
|
|
if (phys == 0 || ext_flags & OCFS2_EXT_UNWRITTEN)
|
|
goto out;
|
|
|
|
ret = ocfs2_grab_eof_pages(inode, range_start, range_end, pages,
|
|
&numpages);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_zero_cluster_pages(inode, range_start, range_end, pages,
|
|
numpages, phys, handle);
|
|
|
|
/*
|
|
* Initiate writeout of the pages we zero'd here. We don't
|
|
* wait on them - the truncate_inode_pages() call later will
|
|
* do that for us.
|
|
*/
|
|
ret = do_sync_mapping_range(inode->i_mapping, range_start,
|
|
range_end - 1, SYNC_FILE_RANGE_WRITE);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
out:
|
|
if (pages)
|
|
kfree(pages);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_zero_dinode_id2_with_xattr(struct inode *inode,
|
|
struct ocfs2_dinode *di)
|
|
{
|
|
unsigned int blocksize = 1 << inode->i_sb->s_blocksize_bits;
|
|
unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
|
|
|
|
if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
|
|
memset(&di->id2, 0, blocksize -
|
|
offsetof(struct ocfs2_dinode, id2) -
|
|
xattrsize);
|
|
else
|
|
memset(&di->id2, 0, blocksize -
|
|
offsetof(struct ocfs2_dinode, id2));
|
|
}
|
|
|
|
void ocfs2_dinode_new_extent_list(struct inode *inode,
|
|
struct ocfs2_dinode *di)
|
|
{
|
|
ocfs2_zero_dinode_id2_with_xattr(inode, di);
|
|
di->id2.i_list.l_tree_depth = 0;
|
|
di->id2.i_list.l_next_free_rec = 0;
|
|
di->id2.i_list.l_count = cpu_to_le16(
|
|
ocfs2_extent_recs_per_inode_with_xattr(inode->i_sb, di));
|
|
}
|
|
|
|
void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di)
|
|
{
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
struct ocfs2_inline_data *idata = &di->id2.i_data;
|
|
|
|
spin_lock(&oi->ip_lock);
|
|
oi->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
|
|
di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
|
|
spin_unlock(&oi->ip_lock);
|
|
|
|
/*
|
|
* We clear the entire i_data structure here so that all
|
|
* fields can be properly initialized.
|
|
*/
|
|
ocfs2_zero_dinode_id2_with_xattr(inode, di);
|
|
|
|
idata->id_count = cpu_to_le16(
|
|
ocfs2_max_inline_data_with_xattr(inode->i_sb, di));
|
|
}
|
|
|
|
int ocfs2_convert_inline_data_to_extents(struct inode *inode,
|
|
struct buffer_head *di_bh)
|
|
{
|
|
int ret, i, has_data, num_pages = 0;
|
|
handle_t *handle;
|
|
u64 uninitialized_var(block);
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
|
|
struct ocfs2_alloc_context *data_ac = NULL;
|
|
struct page **pages = NULL;
|
|
loff_t end = osb->s_clustersize;
|
|
struct ocfs2_extent_tree et;
|
|
int did_quota = 0;
|
|
|
|
has_data = i_size_read(inode) ? 1 : 0;
|
|
|
|
if (has_data) {
|
|
pages = kcalloc(ocfs2_pages_per_cluster(osb->sb),
|
|
sizeof(struct page *), GFP_NOFS);
|
|
if (pages == NULL) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
handle = ocfs2_start_trans(osb,
|
|
ocfs2_inline_to_extents_credits(osb->sb));
|
|
if (IS_ERR(handle)) {
|
|
ret = PTR_ERR(handle);
|
|
mlog_errno(ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = ocfs2_journal_access_di(handle, inode, di_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
if (has_data) {
|
|
u32 bit_off, num;
|
|
unsigned int page_end;
|
|
u64 phys;
|
|
|
|
if (vfs_dq_alloc_space_nodirty(inode,
|
|
ocfs2_clusters_to_bytes(osb->sb, 1))) {
|
|
ret = -EDQUOT;
|
|
goto out_commit;
|
|
}
|
|
did_quota = 1;
|
|
|
|
ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off,
|
|
&num);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
/*
|
|
* Save two copies, one for insert, and one that can
|
|
* be changed by ocfs2_map_and_dirty_page() below.
|
|
*/
|
|
block = phys = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
|
|
|
|
/*
|
|
* Non sparse file systems zero on extend, so no need
|
|
* to do that now.
|
|
*/
|
|
if (!ocfs2_sparse_alloc(osb) &&
|
|
PAGE_CACHE_SIZE < osb->s_clustersize)
|
|
end = PAGE_CACHE_SIZE;
|
|
|
|
ret = ocfs2_grab_eof_pages(inode, 0, end, pages, &num_pages);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
/*
|
|
* This should populate the 1st page for us and mark
|
|
* it up to date.
|
|
*/
|
|
ret = ocfs2_read_inline_data(inode, pages[0], di_bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
page_end = PAGE_CACHE_SIZE;
|
|
if (PAGE_CACHE_SIZE > osb->s_clustersize)
|
|
page_end = osb->s_clustersize;
|
|
|
|
for (i = 0; i < num_pages; i++)
|
|
ocfs2_map_and_dirty_page(inode, handle, 0, page_end,
|
|
pages[i], i > 0, &phys);
|
|
}
|
|
|
|
spin_lock(&oi->ip_lock);
|
|
oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL;
|
|
di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
|
|
spin_unlock(&oi->ip_lock);
|
|
|
|
ocfs2_dinode_new_extent_list(inode, di);
|
|
|
|
ocfs2_journal_dirty(handle, di_bh);
|
|
|
|
if (has_data) {
|
|
/*
|
|
* An error at this point should be extremely rare. If
|
|
* this proves to be false, we could always re-build
|
|
* the in-inode data from our pages.
|
|
*/
|
|
ocfs2_init_dinode_extent_tree(&et, inode, di_bh);
|
|
ret = ocfs2_insert_extent(osb, handle, inode, &et,
|
|
0, block, 1, 0, NULL);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
inode->i_blocks = ocfs2_inode_sector_count(inode);
|
|
}
|
|
|
|
out_commit:
|
|
if (ret < 0 && did_quota)
|
|
vfs_dq_free_space_nodirty(inode,
|
|
ocfs2_clusters_to_bytes(osb->sb, 1));
|
|
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
out_unlock:
|
|
if (data_ac)
|
|
ocfs2_free_alloc_context(data_ac);
|
|
|
|
out:
|
|
if (pages) {
|
|
ocfs2_unlock_and_free_pages(pages, num_pages);
|
|
kfree(pages);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* It is expected, that by the time you call this function,
|
|
* inode->i_size and fe->i_size have been adjusted.
|
|
*
|
|
* WARNING: This will kfree the truncate context
|
|
*/
|
|
int ocfs2_commit_truncate(struct ocfs2_super *osb,
|
|
struct inode *inode,
|
|
struct buffer_head *fe_bh,
|
|
struct ocfs2_truncate_context *tc)
|
|
{
|
|
int status, i, credits, tl_sem = 0;
|
|
u32 clusters_to_del, new_highest_cpos, range;
|
|
struct ocfs2_extent_list *el;
|
|
handle_t *handle = NULL;
|
|
struct inode *tl_inode = osb->osb_tl_inode;
|
|
struct ocfs2_path *path = NULL;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
|
|
|
|
mlog_entry_void();
|
|
|
|
new_highest_cpos = ocfs2_clusters_for_bytes(osb->sb,
|
|
i_size_read(inode));
|
|
|
|
path = ocfs2_new_path(fe_bh, &di->id2.i_list,
|
|
ocfs2_journal_access_di);
|
|
if (!path) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
ocfs2_extent_map_trunc(inode, new_highest_cpos);
|
|
|
|
start:
|
|
/*
|
|
* Check that we still have allocation to delete.
|
|
*/
|
|
if (OCFS2_I(inode)->ip_clusters == 0) {
|
|
status = 0;
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Truncate always works against the rightmost tree branch.
|
|
*/
|
|
status = ocfs2_find_path(inode, path, UINT_MAX);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
mlog(0, "inode->ip_clusters = %u, tree_depth = %u\n",
|
|
OCFS2_I(inode)->ip_clusters, path->p_tree_depth);
|
|
|
|
/*
|
|
* By now, el will point to the extent list on the bottom most
|
|
* portion of this tree. Only the tail record is considered in
|
|
* each pass.
|
|
*
|
|
* We handle the following cases, in order:
|
|
* - empty extent: delete the remaining branch
|
|
* - remove the entire record
|
|
* - remove a partial record
|
|
* - no record needs to be removed (truncate has completed)
|
|
*/
|
|
el = path_leaf_el(path);
|
|
if (le16_to_cpu(el->l_next_free_rec) == 0) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu has empty extent block at %llu\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
(unsigned long long)path_leaf_bh(path)->b_blocknr);
|
|
status = -EROFS;
|
|
goto bail;
|
|
}
|
|
|
|
i = le16_to_cpu(el->l_next_free_rec) - 1;
|
|
range = le32_to_cpu(el->l_recs[i].e_cpos) +
|
|
ocfs2_rec_clusters(el, &el->l_recs[i]);
|
|
if (i == 0 && ocfs2_is_empty_extent(&el->l_recs[i])) {
|
|
clusters_to_del = 0;
|
|
} else if (le32_to_cpu(el->l_recs[i].e_cpos) >= new_highest_cpos) {
|
|
clusters_to_del = ocfs2_rec_clusters(el, &el->l_recs[i]);
|
|
} else if (range > new_highest_cpos) {
|
|
clusters_to_del = (ocfs2_rec_clusters(el, &el->l_recs[i]) +
|
|
le32_to_cpu(el->l_recs[i].e_cpos)) -
|
|
new_highest_cpos;
|
|
} else {
|
|
status = 0;
|
|
goto bail;
|
|
}
|
|
|
|
mlog(0, "clusters_to_del = %u in this pass, tail blk=%llu\n",
|
|
clusters_to_del, (unsigned long long)path_leaf_bh(path)->b_blocknr);
|
|
|
|
mutex_lock(&tl_inode->i_mutex);
|
|
tl_sem = 1;
|
|
/* ocfs2_truncate_log_needs_flush guarantees us at least one
|
|
* record is free for use. If there isn't any, we flush to get
|
|
* an empty truncate log. */
|
|
if (ocfs2_truncate_log_needs_flush(osb)) {
|
|
status = __ocfs2_flush_truncate_log(osb);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
credits = ocfs2_calc_tree_trunc_credits(osb->sb, clusters_to_del,
|
|
(struct ocfs2_dinode *)fe_bh->b_data,
|
|
el);
|
|
handle = ocfs2_start_trans(osb, credits);
|
|
if (IS_ERR(handle)) {
|
|
status = PTR_ERR(handle);
|
|
handle = NULL;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_do_truncate(osb, clusters_to_del, inode, fe_bh, handle,
|
|
tc, path);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
mutex_unlock(&tl_inode->i_mutex);
|
|
tl_sem = 0;
|
|
|
|
ocfs2_commit_trans(osb, handle);
|
|
handle = NULL;
|
|
|
|
ocfs2_reinit_path(path, 1);
|
|
|
|
/*
|
|
* The check above will catch the case where we've truncated
|
|
* away all allocation.
|
|
*/
|
|
goto start;
|
|
|
|
bail:
|
|
|
|
ocfs2_schedule_truncate_log_flush(osb, 1);
|
|
|
|
if (tl_sem)
|
|
mutex_unlock(&tl_inode->i_mutex);
|
|
|
|
if (handle)
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
ocfs2_run_deallocs(osb, &tc->tc_dealloc);
|
|
|
|
ocfs2_free_path(path);
|
|
|
|
/* This will drop the ext_alloc cluster lock for us */
|
|
ocfs2_free_truncate_context(tc);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Expects the inode to already be locked.
|
|
*/
|
|
int ocfs2_prepare_truncate(struct ocfs2_super *osb,
|
|
struct inode *inode,
|
|
struct buffer_head *fe_bh,
|
|
struct ocfs2_truncate_context **tc)
|
|
{
|
|
int status;
|
|
unsigned int new_i_clusters;
|
|
struct ocfs2_dinode *fe;
|
|
struct ocfs2_extent_block *eb;
|
|
struct buffer_head *last_eb_bh = NULL;
|
|
|
|
mlog_entry_void();
|
|
|
|
*tc = NULL;
|
|
|
|
new_i_clusters = ocfs2_clusters_for_bytes(osb->sb,
|
|
i_size_read(inode));
|
|
fe = (struct ocfs2_dinode *) fe_bh->b_data;
|
|
|
|
mlog(0, "fe->i_clusters = %u, new_i_clusters = %u, fe->i_size ="
|
|
"%llu\n", le32_to_cpu(fe->i_clusters), new_i_clusters,
|
|
(unsigned long long)le64_to_cpu(fe->i_size));
|
|
|
|
*tc = kzalloc(sizeof(struct ocfs2_truncate_context), GFP_KERNEL);
|
|
if (!(*tc)) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
ocfs2_init_dealloc_ctxt(&(*tc)->tc_dealloc);
|
|
|
|
if (fe->id2.i_list.l_tree_depth) {
|
|
status = ocfs2_read_extent_block(inode,
|
|
le64_to_cpu(fe->i_last_eb_blk),
|
|
&last_eb_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
|
|
}
|
|
|
|
(*tc)->tc_last_eb_bh = last_eb_bh;
|
|
|
|
status = 0;
|
|
bail:
|
|
if (status < 0) {
|
|
if (*tc)
|
|
ocfs2_free_truncate_context(*tc);
|
|
*tc = NULL;
|
|
}
|
|
mlog_exit_void();
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* 'start' is inclusive, 'end' is not.
|
|
*/
|
|
int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
|
|
unsigned int start, unsigned int end, int trunc)
|
|
{
|
|
int ret;
|
|
unsigned int numbytes;
|
|
handle_t *handle;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
|
|
struct ocfs2_inline_data *idata = &di->id2.i_data;
|
|
|
|
if (end > i_size_read(inode))
|
|
end = i_size_read(inode);
|
|
|
|
BUG_ON(start >= end);
|
|
|
|
if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) ||
|
|
!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL) ||
|
|
!ocfs2_supports_inline_data(osb)) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inline data flags for inode %llu don't agree! "
|
|
"Disk: 0x%x, Memory: 0x%x, Superblock: 0x%x\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
le16_to_cpu(di->i_dyn_features),
|
|
OCFS2_I(inode)->ip_dyn_features,
|
|
osb->s_feature_incompat);
|
|
ret = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
|
|
if (IS_ERR(handle)) {
|
|
ret = PTR_ERR(handle);
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_journal_access_di(handle, inode, di_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
numbytes = end - start;
|
|
memset(idata->id_data + start, 0, numbytes);
|
|
|
|
/*
|
|
* No need to worry about the data page here - it's been
|
|
* truncated already and inline data doesn't need it for
|
|
* pushing zero's to disk, so we'll let readpage pick it up
|
|
* later.
|
|
*/
|
|
if (trunc) {
|
|
i_size_write(inode, start);
|
|
di->i_size = cpu_to_le64(start);
|
|
}
|
|
|
|
inode->i_blocks = ocfs2_inode_sector_count(inode);
|
|
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
|
|
|
|
di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
|
|
di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
|
|
|
|
ocfs2_journal_dirty(handle, di_bh);
|
|
|
|
out_commit:
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc)
|
|
{
|
|
/*
|
|
* The caller is responsible for completing deallocation
|
|
* before freeing the context.
|
|
*/
|
|
if (tc->tc_dealloc.c_first_suballocator != NULL)
|
|
mlog(ML_NOTICE,
|
|
"Truncate completion has non-empty dealloc context\n");
|
|
|
|
brelse(tc->tc_last_eb_bh);
|
|
|
|
kfree(tc);
|
|
}
|