2666 строки
70 KiB
C
2666 строки
70 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* Copyright (c) 2013 Red Hat, Inc.
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* 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 License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would 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
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* GNU 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 License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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#include "xfs_dir2.h"
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#include "xfs_dir2_priv.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_inode_item.h"
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#include "xfs_alloc.h"
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#include "xfs_bmap.h"
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#include "xfs_attr.h"
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#include "xfs_attr_leaf.h"
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#include "xfs_error.h"
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#include "xfs_trace.h"
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#include "xfs_cksum.h"
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#include "xfs_buf_item.h"
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/*
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* xfs_da_btree.c
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*
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* Routines to implement directories as Btrees of hashed names.
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*/
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/*========================================================================
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* Function prototypes for the kernel.
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*========================================================================*/
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/*
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* Routines used for growing the Btree.
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*/
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STATIC int xfs_da3_root_split(xfs_da_state_t *state,
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xfs_da_state_blk_t *existing_root,
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xfs_da_state_blk_t *new_child);
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STATIC int xfs_da3_node_split(xfs_da_state_t *state,
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xfs_da_state_blk_t *existing_blk,
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xfs_da_state_blk_t *split_blk,
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xfs_da_state_blk_t *blk_to_add,
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int treelevel,
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int *result);
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STATIC void xfs_da3_node_rebalance(xfs_da_state_t *state,
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xfs_da_state_blk_t *node_blk_1,
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xfs_da_state_blk_t *node_blk_2);
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STATIC void xfs_da3_node_add(xfs_da_state_t *state,
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xfs_da_state_blk_t *old_node_blk,
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xfs_da_state_blk_t *new_node_blk);
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/*
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* Routines used for shrinking the Btree.
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*/
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STATIC int xfs_da3_root_join(xfs_da_state_t *state,
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xfs_da_state_blk_t *root_blk);
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STATIC int xfs_da3_node_toosmall(xfs_da_state_t *state, int *retval);
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STATIC void xfs_da3_node_remove(xfs_da_state_t *state,
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xfs_da_state_blk_t *drop_blk);
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STATIC void xfs_da3_node_unbalance(xfs_da_state_t *state,
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xfs_da_state_blk_t *src_node_blk,
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xfs_da_state_blk_t *dst_node_blk);
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/*
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* Utility routines.
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*/
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STATIC int xfs_da3_blk_unlink(xfs_da_state_t *state,
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xfs_da_state_blk_t *drop_blk,
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xfs_da_state_blk_t *save_blk);
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kmem_zone_t *xfs_da_state_zone; /* anchor for state struct zone */
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/*
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* Allocate a dir-state structure.
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* We don't put them on the stack since they're large.
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*/
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xfs_da_state_t *
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xfs_da_state_alloc(void)
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{
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return kmem_zone_zalloc(xfs_da_state_zone, KM_NOFS);
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}
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/*
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* Kill the altpath contents of a da-state structure.
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*/
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STATIC void
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xfs_da_state_kill_altpath(xfs_da_state_t *state)
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{
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int i;
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for (i = 0; i < state->altpath.active; i++)
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state->altpath.blk[i].bp = NULL;
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state->altpath.active = 0;
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}
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/*
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* Free a da-state structure.
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*/
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void
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xfs_da_state_free(xfs_da_state_t *state)
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{
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xfs_da_state_kill_altpath(state);
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#ifdef DEBUG
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memset((char *)state, 0, sizeof(*state));
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#endif /* DEBUG */
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kmem_zone_free(xfs_da_state_zone, state);
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}
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static bool
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xfs_da3_node_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_da_intnode *hdr = bp->b_addr;
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struct xfs_da3_icnode_hdr ichdr;
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const struct xfs_dir_ops *ops;
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ops = xfs_dir_get_ops(mp, NULL);
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ops->node_hdr_from_disk(&ichdr, hdr);
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if (xfs_sb_version_hascrc(&mp->m_sb)) {
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struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
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if (ichdr.magic != XFS_DA3_NODE_MAGIC)
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return false;
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if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_uuid))
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return false;
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if (be64_to_cpu(hdr3->info.blkno) != bp->b_bn)
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return false;
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} else {
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if (ichdr.magic != XFS_DA_NODE_MAGIC)
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return false;
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}
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if (ichdr.level == 0)
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return false;
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if (ichdr.level > XFS_DA_NODE_MAXDEPTH)
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return false;
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if (ichdr.count == 0)
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return false;
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/*
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* we don't know if the node is for and attribute or directory tree,
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* so only fail if the count is outside both bounds
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*/
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if (ichdr.count > mp->m_dir_geo->node_ents &&
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ichdr.count > mp->m_attr_geo->node_ents)
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return false;
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/* XXX: hash order check? */
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return true;
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}
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static void
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xfs_da3_node_write_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_buf_log_item *bip = bp->b_fspriv;
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struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
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if (!xfs_da3_node_verify(bp)) {
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xfs_buf_ioerror(bp, -EFSCORRUPTED);
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xfs_verifier_error(bp);
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return;
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}
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return;
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if (bip)
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hdr3->info.lsn = cpu_to_be64(bip->bli_item.li_lsn);
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xfs_buf_update_cksum(bp, XFS_DA3_NODE_CRC_OFF);
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}
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/*
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* leaf/node format detection on trees is sketchy, so a node read can be done on
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* leaf level blocks when detection identifies the tree as a node format tree
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* incorrectly. In this case, we need to swap the verifier to match the correct
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* format of the block being read.
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*/
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static void
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xfs_da3_node_read_verify(
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struct xfs_buf *bp)
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{
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struct xfs_da_blkinfo *info = bp->b_addr;
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switch (be16_to_cpu(info->magic)) {
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case XFS_DA3_NODE_MAGIC:
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if (!xfs_buf_verify_cksum(bp, XFS_DA3_NODE_CRC_OFF)) {
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xfs_buf_ioerror(bp, -EFSBADCRC);
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break;
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}
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/* fall through */
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case XFS_DA_NODE_MAGIC:
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if (!xfs_da3_node_verify(bp)) {
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xfs_buf_ioerror(bp, -EFSCORRUPTED);
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break;
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}
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return;
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case XFS_ATTR_LEAF_MAGIC:
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case XFS_ATTR3_LEAF_MAGIC:
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bp->b_ops = &xfs_attr3_leaf_buf_ops;
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bp->b_ops->verify_read(bp);
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return;
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case XFS_DIR2_LEAFN_MAGIC:
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case XFS_DIR3_LEAFN_MAGIC:
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bp->b_ops = &xfs_dir3_leafn_buf_ops;
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bp->b_ops->verify_read(bp);
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return;
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default:
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break;
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}
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/* corrupt block */
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xfs_verifier_error(bp);
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}
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const struct xfs_buf_ops xfs_da3_node_buf_ops = {
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.verify_read = xfs_da3_node_read_verify,
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.verify_write = xfs_da3_node_write_verify,
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};
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int
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xfs_da3_node_read(
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struct xfs_trans *tp,
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struct xfs_inode *dp,
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xfs_dablk_t bno,
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xfs_daddr_t mappedbno,
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struct xfs_buf **bpp,
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int which_fork)
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{
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int err;
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err = xfs_da_read_buf(tp, dp, bno, mappedbno, bpp,
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which_fork, &xfs_da3_node_buf_ops);
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if (!err && tp) {
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struct xfs_da_blkinfo *info = (*bpp)->b_addr;
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int type;
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switch (be16_to_cpu(info->magic)) {
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case XFS_DA_NODE_MAGIC:
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case XFS_DA3_NODE_MAGIC:
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type = XFS_BLFT_DA_NODE_BUF;
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break;
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case XFS_ATTR_LEAF_MAGIC:
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case XFS_ATTR3_LEAF_MAGIC:
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type = XFS_BLFT_ATTR_LEAF_BUF;
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break;
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case XFS_DIR2_LEAFN_MAGIC:
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case XFS_DIR3_LEAFN_MAGIC:
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type = XFS_BLFT_DIR_LEAFN_BUF;
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break;
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default:
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type = 0;
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ASSERT(0);
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break;
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}
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xfs_trans_buf_set_type(tp, *bpp, type);
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}
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return err;
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}
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/*========================================================================
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* Routines used for growing the Btree.
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*========================================================================*/
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/*
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* Create the initial contents of an intermediate node.
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*/
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int
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xfs_da3_node_create(
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struct xfs_da_args *args,
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xfs_dablk_t blkno,
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int level,
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struct xfs_buf **bpp,
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int whichfork)
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{
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struct xfs_da_intnode *node;
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struct xfs_trans *tp = args->trans;
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struct xfs_mount *mp = tp->t_mountp;
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struct xfs_da3_icnode_hdr ichdr = {0};
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struct xfs_buf *bp;
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int error;
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struct xfs_inode *dp = args->dp;
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trace_xfs_da_node_create(args);
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ASSERT(level <= XFS_DA_NODE_MAXDEPTH);
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error = xfs_da_get_buf(tp, dp, blkno, -1, &bp, whichfork);
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if (error)
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return error;
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bp->b_ops = &xfs_da3_node_buf_ops;
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xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DA_NODE_BUF);
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node = bp->b_addr;
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if (xfs_sb_version_hascrc(&mp->m_sb)) {
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struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
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ichdr.magic = XFS_DA3_NODE_MAGIC;
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hdr3->info.blkno = cpu_to_be64(bp->b_bn);
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hdr3->info.owner = cpu_to_be64(args->dp->i_ino);
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uuid_copy(&hdr3->info.uuid, &mp->m_sb.sb_uuid);
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} else {
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ichdr.magic = XFS_DA_NODE_MAGIC;
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}
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ichdr.level = level;
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dp->d_ops->node_hdr_to_disk(node, &ichdr);
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xfs_trans_log_buf(tp, bp,
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XFS_DA_LOGRANGE(node, &node->hdr, dp->d_ops->node_hdr_size));
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*bpp = bp;
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return 0;
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}
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/*
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* Split a leaf node, rebalance, then possibly split
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* intermediate nodes, rebalance, etc.
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*/
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int /* error */
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xfs_da3_split(
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struct xfs_da_state *state)
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{
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struct xfs_da_state_blk *oldblk;
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struct xfs_da_state_blk *newblk;
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struct xfs_da_state_blk *addblk;
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struct xfs_da_intnode *node;
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struct xfs_buf *bp;
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int max;
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int action = 0;
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int error;
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int i;
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trace_xfs_da_split(state->args);
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/*
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* Walk back up the tree splitting/inserting/adjusting as necessary.
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* If we need to insert and there isn't room, split the node, then
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* decide which fragment to insert the new block from below into.
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* Note that we may split the root this way, but we need more fixup.
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*/
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max = state->path.active - 1;
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ASSERT((max >= 0) && (max < XFS_DA_NODE_MAXDEPTH));
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ASSERT(state->path.blk[max].magic == XFS_ATTR_LEAF_MAGIC ||
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state->path.blk[max].magic == XFS_DIR2_LEAFN_MAGIC);
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addblk = &state->path.blk[max]; /* initial dummy value */
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for (i = max; (i >= 0) && addblk; state->path.active--, i--) {
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oldblk = &state->path.blk[i];
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newblk = &state->altpath.blk[i];
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/*
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* If a leaf node then
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* Allocate a new leaf node, then rebalance across them.
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* else if an intermediate node then
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* We split on the last layer, must we split the node?
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*/
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switch (oldblk->magic) {
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case XFS_ATTR_LEAF_MAGIC:
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error = xfs_attr3_leaf_split(state, oldblk, newblk);
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if ((error != 0) && (error != -ENOSPC)) {
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return error; /* GROT: attr is inconsistent */
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}
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if (!error) {
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addblk = newblk;
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break;
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}
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/*
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* Entry wouldn't fit, split the leaf again.
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*/
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state->extravalid = 1;
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if (state->inleaf) {
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state->extraafter = 0; /* before newblk */
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trace_xfs_attr_leaf_split_before(state->args);
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error = xfs_attr3_leaf_split(state, oldblk,
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&state->extrablk);
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} else {
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state->extraafter = 1; /* after newblk */
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trace_xfs_attr_leaf_split_after(state->args);
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error = xfs_attr3_leaf_split(state, newblk,
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&state->extrablk);
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}
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if (error)
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return error; /* GROT: attr inconsistent */
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addblk = newblk;
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break;
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case XFS_DIR2_LEAFN_MAGIC:
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error = xfs_dir2_leafn_split(state, oldblk, newblk);
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if (error)
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return error;
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addblk = newblk;
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break;
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case XFS_DA_NODE_MAGIC:
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error = xfs_da3_node_split(state, oldblk, newblk, addblk,
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max - i, &action);
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addblk->bp = NULL;
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if (error)
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return error; /* GROT: dir is inconsistent */
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/*
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* Record the newly split block for the next time thru?
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*/
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if (action)
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addblk = newblk;
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else
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addblk = NULL;
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break;
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}
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/*
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* Update the btree to show the new hashval for this child.
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*/
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xfs_da3_fixhashpath(state, &state->path);
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}
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if (!addblk)
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return 0;
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/*
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* Split the root node.
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*/
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ASSERT(state->path.active == 0);
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oldblk = &state->path.blk[0];
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error = xfs_da3_root_split(state, oldblk, addblk);
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if (error) {
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addblk->bp = NULL;
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return error; /* GROT: dir is inconsistent */
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}
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/*
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* Update pointers to the node which used to be block 0 and
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* just got bumped because of the addition of a new root node.
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* There might be three blocks involved if a double split occurred,
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* and the original block 0 could be at any position in the list.
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*
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* Note: the magic numbers and sibling pointers are in the same
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* physical place for both v2 and v3 headers (by design). Hence it
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* doesn't matter which version of the xfs_da_intnode structure we use
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* here as the result will be the same using either structure.
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*/
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node = oldblk->bp->b_addr;
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if (node->hdr.info.forw) {
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if (be32_to_cpu(node->hdr.info.forw) == addblk->blkno) {
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bp = addblk->bp;
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} else {
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ASSERT(state->extravalid);
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bp = state->extrablk.bp;
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}
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node = bp->b_addr;
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node->hdr.info.back = cpu_to_be32(oldblk->blkno);
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xfs_trans_log_buf(state->args->trans, bp,
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XFS_DA_LOGRANGE(node, &node->hdr.info,
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sizeof(node->hdr.info)));
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}
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node = oldblk->bp->b_addr;
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if (node->hdr.info.back) {
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if (be32_to_cpu(node->hdr.info.back) == addblk->blkno) {
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bp = addblk->bp;
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} else {
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ASSERT(state->extravalid);
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bp = state->extrablk.bp;
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}
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node = bp->b_addr;
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node->hdr.info.forw = cpu_to_be32(oldblk->blkno);
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xfs_trans_log_buf(state->args->trans, bp,
|
|
XFS_DA_LOGRANGE(node, &node->hdr.info,
|
|
sizeof(node->hdr.info)));
|
|
}
|
|
addblk->bp = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Split the root. We have to create a new root and point to the two
|
|
* parts (the split old root) that we just created. Copy block zero to
|
|
* the EOF, extending the inode in process.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_da3_root_split(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_blk *blk1,
|
|
struct xfs_da_state_blk *blk2)
|
|
{
|
|
struct xfs_da_intnode *node;
|
|
struct xfs_da_intnode *oldroot;
|
|
struct xfs_da_node_entry *btree;
|
|
struct xfs_da3_icnode_hdr nodehdr;
|
|
struct xfs_da_args *args;
|
|
struct xfs_buf *bp;
|
|
struct xfs_inode *dp;
|
|
struct xfs_trans *tp;
|
|
struct xfs_mount *mp;
|
|
struct xfs_dir2_leaf *leaf;
|
|
xfs_dablk_t blkno;
|
|
int level;
|
|
int error;
|
|
int size;
|
|
|
|
trace_xfs_da_root_split(state->args);
|
|
|
|
/*
|
|
* Copy the existing (incorrect) block from the root node position
|
|
* to a free space somewhere.
|
|
*/
|
|
args = state->args;
|
|
error = xfs_da_grow_inode(args, &blkno);
|
|
if (error)
|
|
return error;
|
|
|
|
dp = args->dp;
|
|
tp = args->trans;
|
|
mp = state->mp;
|
|
error = xfs_da_get_buf(tp, dp, blkno, -1, &bp, args->whichfork);
|
|
if (error)
|
|
return error;
|
|
node = bp->b_addr;
|
|
oldroot = blk1->bp->b_addr;
|
|
if (oldroot->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC) ||
|
|
oldroot->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC)) {
|
|
struct xfs_da3_icnode_hdr nodehdr;
|
|
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, oldroot);
|
|
btree = dp->d_ops->node_tree_p(oldroot);
|
|
size = (int)((char *)&btree[nodehdr.count] - (char *)oldroot);
|
|
level = nodehdr.level;
|
|
|
|
/*
|
|
* we are about to copy oldroot to bp, so set up the type
|
|
* of bp while we know exactly what it will be.
|
|
*/
|
|
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DA_NODE_BUF);
|
|
} else {
|
|
struct xfs_dir3_icleaf_hdr leafhdr;
|
|
struct xfs_dir2_leaf_entry *ents;
|
|
|
|
leaf = (xfs_dir2_leaf_t *)oldroot;
|
|
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
|
|
ents = dp->d_ops->leaf_ents_p(leaf);
|
|
|
|
ASSERT(leafhdr.magic == XFS_DIR2_LEAFN_MAGIC ||
|
|
leafhdr.magic == XFS_DIR3_LEAFN_MAGIC);
|
|
size = (int)((char *)&ents[leafhdr.count] - (char *)leaf);
|
|
level = 0;
|
|
|
|
/*
|
|
* we are about to copy oldroot to bp, so set up the type
|
|
* of bp while we know exactly what it will be.
|
|
*/
|
|
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAFN_BUF);
|
|
}
|
|
|
|
/*
|
|
* we can copy most of the information in the node from one block to
|
|
* another, but for CRC enabled headers we have to make sure that the
|
|
* block specific identifiers are kept intact. We update the buffer
|
|
* directly for this.
|
|
*/
|
|
memcpy(node, oldroot, size);
|
|
if (oldroot->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC) ||
|
|
oldroot->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)) {
|
|
struct xfs_da3_intnode *node3 = (struct xfs_da3_intnode *)node;
|
|
|
|
node3->hdr.info.blkno = cpu_to_be64(bp->b_bn);
|
|
}
|
|
xfs_trans_log_buf(tp, bp, 0, size - 1);
|
|
|
|
bp->b_ops = blk1->bp->b_ops;
|
|
xfs_trans_buf_copy_type(bp, blk1->bp);
|
|
blk1->bp = bp;
|
|
blk1->blkno = blkno;
|
|
|
|
/*
|
|
* Set up the new root node.
|
|
*/
|
|
error = xfs_da3_node_create(args,
|
|
(args->whichfork == XFS_DATA_FORK) ? args->geo->leafblk : 0,
|
|
level + 1, &bp, args->whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
node = bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
btree = dp->d_ops->node_tree_p(node);
|
|
btree[0].hashval = cpu_to_be32(blk1->hashval);
|
|
btree[0].before = cpu_to_be32(blk1->blkno);
|
|
btree[1].hashval = cpu_to_be32(blk2->hashval);
|
|
btree[1].before = cpu_to_be32(blk2->blkno);
|
|
nodehdr.count = 2;
|
|
dp->d_ops->node_hdr_to_disk(node, &nodehdr);
|
|
|
|
#ifdef DEBUG
|
|
if (oldroot->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
|
|
oldroot->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)) {
|
|
ASSERT(blk1->blkno >= args->geo->leafblk &&
|
|
blk1->blkno < args->geo->freeblk);
|
|
ASSERT(blk2->blkno >= args->geo->leafblk &&
|
|
blk2->blkno < args->geo->freeblk);
|
|
}
|
|
#endif
|
|
|
|
/* Header is already logged by xfs_da_node_create */
|
|
xfs_trans_log_buf(tp, bp,
|
|
XFS_DA_LOGRANGE(node, btree, sizeof(xfs_da_node_entry_t) * 2));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Split the node, rebalance, then add the new entry.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_da3_node_split(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_blk *oldblk,
|
|
struct xfs_da_state_blk *newblk,
|
|
struct xfs_da_state_blk *addblk,
|
|
int treelevel,
|
|
int *result)
|
|
{
|
|
struct xfs_da_intnode *node;
|
|
struct xfs_da3_icnode_hdr nodehdr;
|
|
xfs_dablk_t blkno;
|
|
int newcount;
|
|
int error;
|
|
int useextra;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
trace_xfs_da_node_split(state->args);
|
|
|
|
node = oldblk->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
|
|
/*
|
|
* With V2 dirs the extra block is data or freespace.
|
|
*/
|
|
useextra = state->extravalid && state->args->whichfork == XFS_ATTR_FORK;
|
|
newcount = 1 + useextra;
|
|
/*
|
|
* Do we have to split the node?
|
|
*/
|
|
if (nodehdr.count + newcount > state->args->geo->node_ents) {
|
|
/*
|
|
* Allocate a new node, add to the doubly linked chain of
|
|
* nodes, then move some of our excess entries into it.
|
|
*/
|
|
error = xfs_da_grow_inode(state->args, &blkno);
|
|
if (error)
|
|
return error; /* GROT: dir is inconsistent */
|
|
|
|
error = xfs_da3_node_create(state->args, blkno, treelevel,
|
|
&newblk->bp, state->args->whichfork);
|
|
if (error)
|
|
return error; /* GROT: dir is inconsistent */
|
|
newblk->blkno = blkno;
|
|
newblk->magic = XFS_DA_NODE_MAGIC;
|
|
xfs_da3_node_rebalance(state, oldblk, newblk);
|
|
error = xfs_da3_blk_link(state, oldblk, newblk);
|
|
if (error)
|
|
return error;
|
|
*result = 1;
|
|
} else {
|
|
*result = 0;
|
|
}
|
|
|
|
/*
|
|
* Insert the new entry(s) into the correct block
|
|
* (updating last hashval in the process).
|
|
*
|
|
* xfs_da3_node_add() inserts BEFORE the given index,
|
|
* and as a result of using node_lookup_int() we always
|
|
* point to a valid entry (not after one), but a split
|
|
* operation always results in a new block whose hashvals
|
|
* FOLLOW the current block.
|
|
*
|
|
* If we had double-split op below us, then add the extra block too.
|
|
*/
|
|
node = oldblk->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
if (oldblk->index <= nodehdr.count) {
|
|
oldblk->index++;
|
|
xfs_da3_node_add(state, oldblk, addblk);
|
|
if (useextra) {
|
|
if (state->extraafter)
|
|
oldblk->index++;
|
|
xfs_da3_node_add(state, oldblk, &state->extrablk);
|
|
state->extravalid = 0;
|
|
}
|
|
} else {
|
|
newblk->index++;
|
|
xfs_da3_node_add(state, newblk, addblk);
|
|
if (useextra) {
|
|
if (state->extraafter)
|
|
newblk->index++;
|
|
xfs_da3_node_add(state, newblk, &state->extrablk);
|
|
state->extravalid = 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Balance the btree elements between two intermediate nodes,
|
|
* usually one full and one empty.
|
|
*
|
|
* NOTE: if blk2 is empty, then it will get the upper half of blk1.
|
|
*/
|
|
STATIC void
|
|
xfs_da3_node_rebalance(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_blk *blk1,
|
|
struct xfs_da_state_blk *blk2)
|
|
{
|
|
struct xfs_da_intnode *node1;
|
|
struct xfs_da_intnode *node2;
|
|
struct xfs_da_intnode *tmpnode;
|
|
struct xfs_da_node_entry *btree1;
|
|
struct xfs_da_node_entry *btree2;
|
|
struct xfs_da_node_entry *btree_s;
|
|
struct xfs_da_node_entry *btree_d;
|
|
struct xfs_da3_icnode_hdr nodehdr1;
|
|
struct xfs_da3_icnode_hdr nodehdr2;
|
|
struct xfs_trans *tp;
|
|
int count;
|
|
int tmp;
|
|
int swap = 0;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
trace_xfs_da_node_rebalance(state->args);
|
|
|
|
node1 = blk1->bp->b_addr;
|
|
node2 = blk2->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr1, node1);
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr2, node2);
|
|
btree1 = dp->d_ops->node_tree_p(node1);
|
|
btree2 = dp->d_ops->node_tree_p(node2);
|
|
|
|
/*
|
|
* Figure out how many entries need to move, and in which direction.
|
|
* Swap the nodes around if that makes it simpler.
|
|
*/
|
|
if (nodehdr1.count > 0 && nodehdr2.count > 0 &&
|
|
((be32_to_cpu(btree2[0].hashval) < be32_to_cpu(btree1[0].hashval)) ||
|
|
(be32_to_cpu(btree2[nodehdr2.count - 1].hashval) <
|
|
be32_to_cpu(btree1[nodehdr1.count - 1].hashval)))) {
|
|
tmpnode = node1;
|
|
node1 = node2;
|
|
node2 = tmpnode;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr1, node1);
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr2, node2);
|
|
btree1 = dp->d_ops->node_tree_p(node1);
|
|
btree2 = dp->d_ops->node_tree_p(node2);
|
|
swap = 1;
|
|
}
|
|
|
|
count = (nodehdr1.count - nodehdr2.count) / 2;
|
|
if (count == 0)
|
|
return;
|
|
tp = state->args->trans;
|
|
/*
|
|
* Two cases: high-to-low and low-to-high.
|
|
*/
|
|
if (count > 0) {
|
|
/*
|
|
* Move elements in node2 up to make a hole.
|
|
*/
|
|
tmp = nodehdr2.count;
|
|
if (tmp > 0) {
|
|
tmp *= (uint)sizeof(xfs_da_node_entry_t);
|
|
btree_s = &btree2[0];
|
|
btree_d = &btree2[count];
|
|
memmove(btree_d, btree_s, tmp);
|
|
}
|
|
|
|
/*
|
|
* Move the req'd B-tree elements from high in node1 to
|
|
* low in node2.
|
|
*/
|
|
nodehdr2.count += count;
|
|
tmp = count * (uint)sizeof(xfs_da_node_entry_t);
|
|
btree_s = &btree1[nodehdr1.count - count];
|
|
btree_d = &btree2[0];
|
|
memcpy(btree_d, btree_s, tmp);
|
|
nodehdr1.count -= count;
|
|
} else {
|
|
/*
|
|
* Move the req'd B-tree elements from low in node2 to
|
|
* high in node1.
|
|
*/
|
|
count = -count;
|
|
tmp = count * (uint)sizeof(xfs_da_node_entry_t);
|
|
btree_s = &btree2[0];
|
|
btree_d = &btree1[nodehdr1.count];
|
|
memcpy(btree_d, btree_s, tmp);
|
|
nodehdr1.count += count;
|
|
|
|
xfs_trans_log_buf(tp, blk1->bp,
|
|
XFS_DA_LOGRANGE(node1, btree_d, tmp));
|
|
|
|
/*
|
|
* Move elements in node2 down to fill the hole.
|
|
*/
|
|
tmp = nodehdr2.count - count;
|
|
tmp *= (uint)sizeof(xfs_da_node_entry_t);
|
|
btree_s = &btree2[count];
|
|
btree_d = &btree2[0];
|
|
memmove(btree_d, btree_s, tmp);
|
|
nodehdr2.count -= count;
|
|
}
|
|
|
|
/*
|
|
* Log header of node 1 and all current bits of node 2.
|
|
*/
|
|
dp->d_ops->node_hdr_to_disk(node1, &nodehdr1);
|
|
xfs_trans_log_buf(tp, blk1->bp,
|
|
XFS_DA_LOGRANGE(node1, &node1->hdr, dp->d_ops->node_hdr_size));
|
|
|
|
dp->d_ops->node_hdr_to_disk(node2, &nodehdr2);
|
|
xfs_trans_log_buf(tp, blk2->bp,
|
|
XFS_DA_LOGRANGE(node2, &node2->hdr,
|
|
dp->d_ops->node_hdr_size +
|
|
(sizeof(btree2[0]) * nodehdr2.count)));
|
|
|
|
/*
|
|
* Record the last hashval from each block for upward propagation.
|
|
* (note: don't use the swapped node pointers)
|
|
*/
|
|
if (swap) {
|
|
node1 = blk1->bp->b_addr;
|
|
node2 = blk2->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr1, node1);
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr2, node2);
|
|
btree1 = dp->d_ops->node_tree_p(node1);
|
|
btree2 = dp->d_ops->node_tree_p(node2);
|
|
}
|
|
blk1->hashval = be32_to_cpu(btree1[nodehdr1.count - 1].hashval);
|
|
blk2->hashval = be32_to_cpu(btree2[nodehdr2.count - 1].hashval);
|
|
|
|
/*
|
|
* Adjust the expected index for insertion.
|
|
*/
|
|
if (blk1->index >= nodehdr1.count) {
|
|
blk2->index = blk1->index - nodehdr1.count;
|
|
blk1->index = nodehdr1.count + 1; /* make it invalid */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add a new entry to an intermediate node.
|
|
*/
|
|
STATIC void
|
|
xfs_da3_node_add(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_blk *oldblk,
|
|
struct xfs_da_state_blk *newblk)
|
|
{
|
|
struct xfs_da_intnode *node;
|
|
struct xfs_da3_icnode_hdr nodehdr;
|
|
struct xfs_da_node_entry *btree;
|
|
int tmp;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
trace_xfs_da_node_add(state->args);
|
|
|
|
node = oldblk->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
btree = dp->d_ops->node_tree_p(node);
|
|
|
|
ASSERT(oldblk->index >= 0 && oldblk->index <= nodehdr.count);
|
|
ASSERT(newblk->blkno != 0);
|
|
if (state->args->whichfork == XFS_DATA_FORK)
|
|
ASSERT(newblk->blkno >= state->args->geo->leafblk &&
|
|
newblk->blkno < state->args->geo->freeblk);
|
|
|
|
/*
|
|
* We may need to make some room before we insert the new node.
|
|
*/
|
|
tmp = 0;
|
|
if (oldblk->index < nodehdr.count) {
|
|
tmp = (nodehdr.count - oldblk->index) * (uint)sizeof(*btree);
|
|
memmove(&btree[oldblk->index + 1], &btree[oldblk->index], tmp);
|
|
}
|
|
btree[oldblk->index].hashval = cpu_to_be32(newblk->hashval);
|
|
btree[oldblk->index].before = cpu_to_be32(newblk->blkno);
|
|
xfs_trans_log_buf(state->args->trans, oldblk->bp,
|
|
XFS_DA_LOGRANGE(node, &btree[oldblk->index],
|
|
tmp + sizeof(*btree)));
|
|
|
|
nodehdr.count += 1;
|
|
dp->d_ops->node_hdr_to_disk(node, &nodehdr);
|
|
xfs_trans_log_buf(state->args->trans, oldblk->bp,
|
|
XFS_DA_LOGRANGE(node, &node->hdr, dp->d_ops->node_hdr_size));
|
|
|
|
/*
|
|
* Copy the last hash value from the oldblk to propagate upwards.
|
|
*/
|
|
oldblk->hashval = be32_to_cpu(btree[nodehdr.count - 1].hashval);
|
|
}
|
|
|
|
/*========================================================================
|
|
* Routines used for shrinking the Btree.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Deallocate an empty leaf node, remove it from its parent,
|
|
* possibly deallocating that block, etc...
|
|
*/
|
|
int
|
|
xfs_da3_join(
|
|
struct xfs_da_state *state)
|
|
{
|
|
struct xfs_da_state_blk *drop_blk;
|
|
struct xfs_da_state_blk *save_blk;
|
|
int action = 0;
|
|
int error;
|
|
|
|
trace_xfs_da_join(state->args);
|
|
|
|
drop_blk = &state->path.blk[ state->path.active-1 ];
|
|
save_blk = &state->altpath.blk[ state->path.active-1 ];
|
|
ASSERT(state->path.blk[0].magic == XFS_DA_NODE_MAGIC);
|
|
ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC ||
|
|
drop_blk->magic == XFS_DIR2_LEAFN_MAGIC);
|
|
|
|
/*
|
|
* Walk back up the tree joining/deallocating as necessary.
|
|
* When we stop dropping blocks, break out.
|
|
*/
|
|
for ( ; state->path.active >= 2; drop_blk--, save_blk--,
|
|
state->path.active--) {
|
|
/*
|
|
* See if we can combine the block with a neighbor.
|
|
* (action == 0) => no options, just leave
|
|
* (action == 1) => coalesce, then unlink
|
|
* (action == 2) => block empty, unlink it
|
|
*/
|
|
switch (drop_blk->magic) {
|
|
case XFS_ATTR_LEAF_MAGIC:
|
|
error = xfs_attr3_leaf_toosmall(state, &action);
|
|
if (error)
|
|
return error;
|
|
if (action == 0)
|
|
return 0;
|
|
xfs_attr3_leaf_unbalance(state, drop_blk, save_blk);
|
|
break;
|
|
case XFS_DIR2_LEAFN_MAGIC:
|
|
error = xfs_dir2_leafn_toosmall(state, &action);
|
|
if (error)
|
|
return error;
|
|
if (action == 0)
|
|
return 0;
|
|
xfs_dir2_leafn_unbalance(state, drop_blk, save_blk);
|
|
break;
|
|
case XFS_DA_NODE_MAGIC:
|
|
/*
|
|
* Remove the offending node, fixup hashvals,
|
|
* check for a toosmall neighbor.
|
|
*/
|
|
xfs_da3_node_remove(state, drop_blk);
|
|
xfs_da3_fixhashpath(state, &state->path);
|
|
error = xfs_da3_node_toosmall(state, &action);
|
|
if (error)
|
|
return error;
|
|
if (action == 0)
|
|
return 0;
|
|
xfs_da3_node_unbalance(state, drop_blk, save_blk);
|
|
break;
|
|
}
|
|
xfs_da3_fixhashpath(state, &state->altpath);
|
|
error = xfs_da3_blk_unlink(state, drop_blk, save_blk);
|
|
xfs_da_state_kill_altpath(state);
|
|
if (error)
|
|
return error;
|
|
error = xfs_da_shrink_inode(state->args, drop_blk->blkno,
|
|
drop_blk->bp);
|
|
drop_blk->bp = NULL;
|
|
if (error)
|
|
return error;
|
|
}
|
|
/*
|
|
* We joined all the way to the top. If it turns out that
|
|
* we only have one entry in the root, make the child block
|
|
* the new root.
|
|
*/
|
|
xfs_da3_node_remove(state, drop_blk);
|
|
xfs_da3_fixhashpath(state, &state->path);
|
|
error = xfs_da3_root_join(state, &state->path.blk[0]);
|
|
return error;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
static void
|
|
xfs_da_blkinfo_onlychild_validate(struct xfs_da_blkinfo *blkinfo, __u16 level)
|
|
{
|
|
__be16 magic = blkinfo->magic;
|
|
|
|
if (level == 1) {
|
|
ASSERT(magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
|
|
magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC) ||
|
|
magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC) ||
|
|
magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC));
|
|
} else {
|
|
ASSERT(magic == cpu_to_be16(XFS_DA_NODE_MAGIC) ||
|
|
magic == cpu_to_be16(XFS_DA3_NODE_MAGIC));
|
|
}
|
|
ASSERT(!blkinfo->forw);
|
|
ASSERT(!blkinfo->back);
|
|
}
|
|
#else /* !DEBUG */
|
|
#define xfs_da_blkinfo_onlychild_validate(blkinfo, level)
|
|
#endif /* !DEBUG */
|
|
|
|
/*
|
|
* We have only one entry in the root. Copy the only remaining child of
|
|
* the old root to block 0 as the new root node.
|
|
*/
|
|
STATIC int
|
|
xfs_da3_root_join(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_blk *root_blk)
|
|
{
|
|
struct xfs_da_intnode *oldroot;
|
|
struct xfs_da_args *args;
|
|
xfs_dablk_t child;
|
|
struct xfs_buf *bp;
|
|
struct xfs_da3_icnode_hdr oldroothdr;
|
|
struct xfs_da_node_entry *btree;
|
|
int error;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
trace_xfs_da_root_join(state->args);
|
|
|
|
ASSERT(root_blk->magic == XFS_DA_NODE_MAGIC);
|
|
|
|
args = state->args;
|
|
oldroot = root_blk->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&oldroothdr, oldroot);
|
|
ASSERT(oldroothdr.forw == 0);
|
|
ASSERT(oldroothdr.back == 0);
|
|
|
|
/*
|
|
* If the root has more than one child, then don't do anything.
|
|
*/
|
|
if (oldroothdr.count > 1)
|
|
return 0;
|
|
|
|
/*
|
|
* Read in the (only) child block, then copy those bytes into
|
|
* the root block's buffer and free the original child block.
|
|
*/
|
|
btree = dp->d_ops->node_tree_p(oldroot);
|
|
child = be32_to_cpu(btree[0].before);
|
|
ASSERT(child != 0);
|
|
error = xfs_da3_node_read(args->trans, dp, child, -1, &bp,
|
|
args->whichfork);
|
|
if (error)
|
|
return error;
|
|
xfs_da_blkinfo_onlychild_validate(bp->b_addr, oldroothdr.level);
|
|
|
|
/*
|
|
* This could be copying a leaf back into the root block in the case of
|
|
* there only being a single leaf block left in the tree. Hence we have
|
|
* to update the b_ops pointer as well to match the buffer type change
|
|
* that could occur. For dir3 blocks we also need to update the block
|
|
* number in the buffer header.
|
|
*/
|
|
memcpy(root_blk->bp->b_addr, bp->b_addr, args->geo->blksize);
|
|
root_blk->bp->b_ops = bp->b_ops;
|
|
xfs_trans_buf_copy_type(root_blk->bp, bp);
|
|
if (oldroothdr.magic == XFS_DA3_NODE_MAGIC) {
|
|
struct xfs_da3_blkinfo *da3 = root_blk->bp->b_addr;
|
|
da3->blkno = cpu_to_be64(root_blk->bp->b_bn);
|
|
}
|
|
xfs_trans_log_buf(args->trans, root_blk->bp, 0,
|
|
args->geo->blksize - 1);
|
|
error = xfs_da_shrink_inode(args, child, bp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Check a node block and its neighbors to see if the block should be
|
|
* collapsed into one or the other neighbor. Always keep the block
|
|
* with the smaller block number.
|
|
* If the current block is over 50% full, don't try to join it, return 0.
|
|
* If the block is empty, fill in the state structure and return 2.
|
|
* If it can be collapsed, fill in the state structure and return 1.
|
|
* If nothing can be done, return 0.
|
|
*/
|
|
STATIC int
|
|
xfs_da3_node_toosmall(
|
|
struct xfs_da_state *state,
|
|
int *action)
|
|
{
|
|
struct xfs_da_intnode *node;
|
|
struct xfs_da_state_blk *blk;
|
|
struct xfs_da_blkinfo *info;
|
|
xfs_dablk_t blkno;
|
|
struct xfs_buf *bp;
|
|
struct xfs_da3_icnode_hdr nodehdr;
|
|
int count;
|
|
int forward;
|
|
int error;
|
|
int retval;
|
|
int i;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
trace_xfs_da_node_toosmall(state->args);
|
|
|
|
/*
|
|
* Check for the degenerate case of the block being over 50% full.
|
|
* If so, it's not worth even looking to see if we might be able
|
|
* to coalesce with a sibling.
|
|
*/
|
|
blk = &state->path.blk[ state->path.active-1 ];
|
|
info = blk->bp->b_addr;
|
|
node = (xfs_da_intnode_t *)info;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
if (nodehdr.count > (state->args->geo->node_ents >> 1)) {
|
|
*action = 0; /* blk over 50%, don't try to join */
|
|
return 0; /* blk over 50%, don't try to join */
|
|
}
|
|
|
|
/*
|
|
* Check for the degenerate case of the block being empty.
|
|
* If the block is empty, we'll simply delete it, no need to
|
|
* coalesce it with a sibling block. We choose (arbitrarily)
|
|
* to merge with the forward block unless it is NULL.
|
|
*/
|
|
if (nodehdr.count == 0) {
|
|
/*
|
|
* Make altpath point to the block we want to keep and
|
|
* path point to the block we want to drop (this one).
|
|
*/
|
|
forward = (info->forw != 0);
|
|
memcpy(&state->altpath, &state->path, sizeof(state->path));
|
|
error = xfs_da3_path_shift(state, &state->altpath, forward,
|
|
0, &retval);
|
|
if (error)
|
|
return error;
|
|
if (retval) {
|
|
*action = 0;
|
|
} else {
|
|
*action = 2;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Examine each sibling block to see if we can coalesce with
|
|
* at least 25% free space to spare. We need to figure out
|
|
* whether to merge with the forward or the backward block.
|
|
* We prefer coalescing with the lower numbered sibling so as
|
|
* to shrink a directory over time.
|
|
*/
|
|
count = state->args->geo->node_ents;
|
|
count -= state->args->geo->node_ents >> 2;
|
|
count -= nodehdr.count;
|
|
|
|
/* start with smaller blk num */
|
|
forward = nodehdr.forw < nodehdr.back;
|
|
for (i = 0; i < 2; forward = !forward, i++) {
|
|
struct xfs_da3_icnode_hdr thdr;
|
|
if (forward)
|
|
blkno = nodehdr.forw;
|
|
else
|
|
blkno = nodehdr.back;
|
|
if (blkno == 0)
|
|
continue;
|
|
error = xfs_da3_node_read(state->args->trans, dp,
|
|
blkno, -1, &bp, state->args->whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
node = bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&thdr, node);
|
|
xfs_trans_brelse(state->args->trans, bp);
|
|
|
|
if (count - thdr.count >= 0)
|
|
break; /* fits with at least 25% to spare */
|
|
}
|
|
if (i >= 2) {
|
|
*action = 0;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Make altpath point to the block we want to keep (the lower
|
|
* numbered block) and path point to the block we want to drop.
|
|
*/
|
|
memcpy(&state->altpath, &state->path, sizeof(state->path));
|
|
if (blkno < blk->blkno) {
|
|
error = xfs_da3_path_shift(state, &state->altpath, forward,
|
|
0, &retval);
|
|
} else {
|
|
error = xfs_da3_path_shift(state, &state->path, forward,
|
|
0, &retval);
|
|
}
|
|
if (error)
|
|
return error;
|
|
if (retval) {
|
|
*action = 0;
|
|
return 0;
|
|
}
|
|
*action = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Pick up the last hashvalue from an intermediate node.
|
|
*/
|
|
STATIC uint
|
|
xfs_da3_node_lasthash(
|
|
struct xfs_inode *dp,
|
|
struct xfs_buf *bp,
|
|
int *count)
|
|
{
|
|
struct xfs_da_intnode *node;
|
|
struct xfs_da_node_entry *btree;
|
|
struct xfs_da3_icnode_hdr nodehdr;
|
|
|
|
node = bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
if (count)
|
|
*count = nodehdr.count;
|
|
if (!nodehdr.count)
|
|
return 0;
|
|
btree = dp->d_ops->node_tree_p(node);
|
|
return be32_to_cpu(btree[nodehdr.count - 1].hashval);
|
|
}
|
|
|
|
/*
|
|
* Walk back up the tree adjusting hash values as necessary,
|
|
* when we stop making changes, return.
|
|
*/
|
|
void
|
|
xfs_da3_fixhashpath(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_path *path)
|
|
{
|
|
struct xfs_da_state_blk *blk;
|
|
struct xfs_da_intnode *node;
|
|
struct xfs_da_node_entry *btree;
|
|
xfs_dahash_t lasthash=0;
|
|
int level;
|
|
int count;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
trace_xfs_da_fixhashpath(state->args);
|
|
|
|
level = path->active-1;
|
|
blk = &path->blk[ level ];
|
|
switch (blk->magic) {
|
|
case XFS_ATTR_LEAF_MAGIC:
|
|
lasthash = xfs_attr_leaf_lasthash(blk->bp, &count);
|
|
if (count == 0)
|
|
return;
|
|
break;
|
|
case XFS_DIR2_LEAFN_MAGIC:
|
|
lasthash = xfs_dir2_leafn_lasthash(dp, blk->bp, &count);
|
|
if (count == 0)
|
|
return;
|
|
break;
|
|
case XFS_DA_NODE_MAGIC:
|
|
lasthash = xfs_da3_node_lasthash(dp, blk->bp, &count);
|
|
if (count == 0)
|
|
return;
|
|
break;
|
|
}
|
|
for (blk--, level--; level >= 0; blk--, level--) {
|
|
struct xfs_da3_icnode_hdr nodehdr;
|
|
|
|
node = blk->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
btree = dp->d_ops->node_tree_p(node);
|
|
if (be32_to_cpu(btree[blk->index].hashval) == lasthash)
|
|
break;
|
|
blk->hashval = lasthash;
|
|
btree[blk->index].hashval = cpu_to_be32(lasthash);
|
|
xfs_trans_log_buf(state->args->trans, blk->bp,
|
|
XFS_DA_LOGRANGE(node, &btree[blk->index],
|
|
sizeof(*btree)));
|
|
|
|
lasthash = be32_to_cpu(btree[nodehdr.count - 1].hashval);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove an entry from an intermediate node.
|
|
*/
|
|
STATIC void
|
|
xfs_da3_node_remove(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_blk *drop_blk)
|
|
{
|
|
struct xfs_da_intnode *node;
|
|
struct xfs_da3_icnode_hdr nodehdr;
|
|
struct xfs_da_node_entry *btree;
|
|
int index;
|
|
int tmp;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
trace_xfs_da_node_remove(state->args);
|
|
|
|
node = drop_blk->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
ASSERT(drop_blk->index < nodehdr.count);
|
|
ASSERT(drop_blk->index >= 0);
|
|
|
|
/*
|
|
* Copy over the offending entry, or just zero it out.
|
|
*/
|
|
index = drop_blk->index;
|
|
btree = dp->d_ops->node_tree_p(node);
|
|
if (index < nodehdr.count - 1) {
|
|
tmp = nodehdr.count - index - 1;
|
|
tmp *= (uint)sizeof(xfs_da_node_entry_t);
|
|
memmove(&btree[index], &btree[index + 1], tmp);
|
|
xfs_trans_log_buf(state->args->trans, drop_blk->bp,
|
|
XFS_DA_LOGRANGE(node, &btree[index], tmp));
|
|
index = nodehdr.count - 1;
|
|
}
|
|
memset(&btree[index], 0, sizeof(xfs_da_node_entry_t));
|
|
xfs_trans_log_buf(state->args->trans, drop_blk->bp,
|
|
XFS_DA_LOGRANGE(node, &btree[index], sizeof(btree[index])));
|
|
nodehdr.count -= 1;
|
|
dp->d_ops->node_hdr_to_disk(node, &nodehdr);
|
|
xfs_trans_log_buf(state->args->trans, drop_blk->bp,
|
|
XFS_DA_LOGRANGE(node, &node->hdr, dp->d_ops->node_hdr_size));
|
|
|
|
/*
|
|
* Copy the last hash value from the block to propagate upwards.
|
|
*/
|
|
drop_blk->hashval = be32_to_cpu(btree[index - 1].hashval);
|
|
}
|
|
|
|
/*
|
|
* Unbalance the elements between two intermediate nodes,
|
|
* move all Btree elements from one node into another.
|
|
*/
|
|
STATIC void
|
|
xfs_da3_node_unbalance(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_blk *drop_blk,
|
|
struct xfs_da_state_blk *save_blk)
|
|
{
|
|
struct xfs_da_intnode *drop_node;
|
|
struct xfs_da_intnode *save_node;
|
|
struct xfs_da_node_entry *drop_btree;
|
|
struct xfs_da_node_entry *save_btree;
|
|
struct xfs_da3_icnode_hdr drop_hdr;
|
|
struct xfs_da3_icnode_hdr save_hdr;
|
|
struct xfs_trans *tp;
|
|
int sindex;
|
|
int tmp;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
trace_xfs_da_node_unbalance(state->args);
|
|
|
|
drop_node = drop_blk->bp->b_addr;
|
|
save_node = save_blk->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&drop_hdr, drop_node);
|
|
dp->d_ops->node_hdr_from_disk(&save_hdr, save_node);
|
|
drop_btree = dp->d_ops->node_tree_p(drop_node);
|
|
save_btree = dp->d_ops->node_tree_p(save_node);
|
|
tp = state->args->trans;
|
|
|
|
/*
|
|
* If the dying block has lower hashvals, then move all the
|
|
* elements in the remaining block up to make a hole.
|
|
*/
|
|
if ((be32_to_cpu(drop_btree[0].hashval) <
|
|
be32_to_cpu(save_btree[0].hashval)) ||
|
|
(be32_to_cpu(drop_btree[drop_hdr.count - 1].hashval) <
|
|
be32_to_cpu(save_btree[save_hdr.count - 1].hashval))) {
|
|
/* XXX: check this - is memmove dst correct? */
|
|
tmp = save_hdr.count * sizeof(xfs_da_node_entry_t);
|
|
memmove(&save_btree[drop_hdr.count], &save_btree[0], tmp);
|
|
|
|
sindex = 0;
|
|
xfs_trans_log_buf(tp, save_blk->bp,
|
|
XFS_DA_LOGRANGE(save_node, &save_btree[0],
|
|
(save_hdr.count + drop_hdr.count) *
|
|
sizeof(xfs_da_node_entry_t)));
|
|
} else {
|
|
sindex = save_hdr.count;
|
|
xfs_trans_log_buf(tp, save_blk->bp,
|
|
XFS_DA_LOGRANGE(save_node, &save_btree[sindex],
|
|
drop_hdr.count * sizeof(xfs_da_node_entry_t)));
|
|
}
|
|
|
|
/*
|
|
* Move all the B-tree elements from drop_blk to save_blk.
|
|
*/
|
|
tmp = drop_hdr.count * (uint)sizeof(xfs_da_node_entry_t);
|
|
memcpy(&save_btree[sindex], &drop_btree[0], tmp);
|
|
save_hdr.count += drop_hdr.count;
|
|
|
|
dp->d_ops->node_hdr_to_disk(save_node, &save_hdr);
|
|
xfs_trans_log_buf(tp, save_blk->bp,
|
|
XFS_DA_LOGRANGE(save_node, &save_node->hdr,
|
|
dp->d_ops->node_hdr_size));
|
|
|
|
/*
|
|
* Save the last hashval in the remaining block for upward propagation.
|
|
*/
|
|
save_blk->hashval = be32_to_cpu(save_btree[save_hdr.count - 1].hashval);
|
|
}
|
|
|
|
/*========================================================================
|
|
* Routines used for finding things in the Btree.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Walk down the Btree looking for a particular filename, filling
|
|
* in the state structure as we go.
|
|
*
|
|
* We will set the state structure to point to each of the elements
|
|
* in each of the nodes where either the hashval is or should be.
|
|
*
|
|
* We support duplicate hashval's so for each entry in the current
|
|
* node that could contain the desired hashval, descend. This is a
|
|
* pruned depth-first tree search.
|
|
*/
|
|
int /* error */
|
|
xfs_da3_node_lookup_int(
|
|
struct xfs_da_state *state,
|
|
int *result)
|
|
{
|
|
struct xfs_da_state_blk *blk;
|
|
struct xfs_da_blkinfo *curr;
|
|
struct xfs_da_intnode *node;
|
|
struct xfs_da_node_entry *btree;
|
|
struct xfs_da3_icnode_hdr nodehdr;
|
|
struct xfs_da_args *args;
|
|
xfs_dablk_t blkno;
|
|
xfs_dahash_t hashval;
|
|
xfs_dahash_t btreehashval;
|
|
int probe;
|
|
int span;
|
|
int max;
|
|
int error;
|
|
int retval;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
args = state->args;
|
|
|
|
/*
|
|
* Descend thru the B-tree searching each level for the right
|
|
* node to use, until the right hashval is found.
|
|
*/
|
|
blkno = (args->whichfork == XFS_DATA_FORK)? args->geo->leafblk : 0;
|
|
for (blk = &state->path.blk[0], state->path.active = 1;
|
|
state->path.active <= XFS_DA_NODE_MAXDEPTH;
|
|
blk++, state->path.active++) {
|
|
/*
|
|
* Read the next node down in the tree.
|
|
*/
|
|
blk->blkno = blkno;
|
|
error = xfs_da3_node_read(args->trans, args->dp, blkno,
|
|
-1, &blk->bp, args->whichfork);
|
|
if (error) {
|
|
blk->blkno = 0;
|
|
state->path.active--;
|
|
return error;
|
|
}
|
|
curr = blk->bp->b_addr;
|
|
blk->magic = be16_to_cpu(curr->magic);
|
|
|
|
if (blk->magic == XFS_ATTR_LEAF_MAGIC ||
|
|
blk->magic == XFS_ATTR3_LEAF_MAGIC) {
|
|
blk->magic = XFS_ATTR_LEAF_MAGIC;
|
|
blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL);
|
|
break;
|
|
}
|
|
|
|
if (blk->magic == XFS_DIR2_LEAFN_MAGIC ||
|
|
blk->magic == XFS_DIR3_LEAFN_MAGIC) {
|
|
blk->magic = XFS_DIR2_LEAFN_MAGIC;
|
|
blk->hashval = xfs_dir2_leafn_lasthash(args->dp,
|
|
blk->bp, NULL);
|
|
break;
|
|
}
|
|
|
|
blk->magic = XFS_DA_NODE_MAGIC;
|
|
|
|
|
|
/*
|
|
* Search an intermediate node for a match.
|
|
*/
|
|
node = blk->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
btree = dp->d_ops->node_tree_p(node);
|
|
|
|
max = nodehdr.count;
|
|
blk->hashval = be32_to_cpu(btree[max - 1].hashval);
|
|
|
|
/*
|
|
* Binary search. (note: small blocks will skip loop)
|
|
*/
|
|
probe = span = max / 2;
|
|
hashval = args->hashval;
|
|
while (span > 4) {
|
|
span /= 2;
|
|
btreehashval = be32_to_cpu(btree[probe].hashval);
|
|
if (btreehashval < hashval)
|
|
probe += span;
|
|
else if (btreehashval > hashval)
|
|
probe -= span;
|
|
else
|
|
break;
|
|
}
|
|
ASSERT((probe >= 0) && (probe < max));
|
|
ASSERT((span <= 4) ||
|
|
(be32_to_cpu(btree[probe].hashval) == hashval));
|
|
|
|
/*
|
|
* Since we may have duplicate hashval's, find the first
|
|
* matching hashval in the node.
|
|
*/
|
|
while (probe > 0 &&
|
|
be32_to_cpu(btree[probe].hashval) >= hashval) {
|
|
probe--;
|
|
}
|
|
while (probe < max &&
|
|
be32_to_cpu(btree[probe].hashval) < hashval) {
|
|
probe++;
|
|
}
|
|
|
|
/*
|
|
* Pick the right block to descend on.
|
|
*/
|
|
if (probe == max) {
|
|
blk->index = max - 1;
|
|
blkno = be32_to_cpu(btree[max - 1].before);
|
|
} else {
|
|
blk->index = probe;
|
|
blkno = be32_to_cpu(btree[probe].before);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* A leaf block that ends in the hashval that we are interested in
|
|
* (final hashval == search hashval) means that the next block may
|
|
* contain more entries with the same hashval, shift upward to the
|
|
* next leaf and keep searching.
|
|
*/
|
|
for (;;) {
|
|
if (blk->magic == XFS_DIR2_LEAFN_MAGIC) {
|
|
retval = xfs_dir2_leafn_lookup_int(blk->bp, args,
|
|
&blk->index, state);
|
|
} else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
|
|
retval = xfs_attr3_leaf_lookup_int(blk->bp, args);
|
|
blk->index = args->index;
|
|
args->blkno = blk->blkno;
|
|
} else {
|
|
ASSERT(0);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
if (((retval == -ENOENT) || (retval == -ENOATTR)) &&
|
|
(blk->hashval == args->hashval)) {
|
|
error = xfs_da3_path_shift(state, &state->path, 1, 1,
|
|
&retval);
|
|
if (error)
|
|
return error;
|
|
if (retval == 0) {
|
|
continue;
|
|
} else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
|
|
/* path_shift() gives ENOENT */
|
|
retval = -ENOATTR;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
*result = retval;
|
|
return 0;
|
|
}
|
|
|
|
/*========================================================================
|
|
* Utility routines.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Compare two intermediate nodes for "order".
|
|
*/
|
|
STATIC int
|
|
xfs_da3_node_order(
|
|
struct xfs_inode *dp,
|
|
struct xfs_buf *node1_bp,
|
|
struct xfs_buf *node2_bp)
|
|
{
|
|
struct xfs_da_intnode *node1;
|
|
struct xfs_da_intnode *node2;
|
|
struct xfs_da_node_entry *btree1;
|
|
struct xfs_da_node_entry *btree2;
|
|
struct xfs_da3_icnode_hdr node1hdr;
|
|
struct xfs_da3_icnode_hdr node2hdr;
|
|
|
|
node1 = node1_bp->b_addr;
|
|
node2 = node2_bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&node1hdr, node1);
|
|
dp->d_ops->node_hdr_from_disk(&node2hdr, node2);
|
|
btree1 = dp->d_ops->node_tree_p(node1);
|
|
btree2 = dp->d_ops->node_tree_p(node2);
|
|
|
|
if (node1hdr.count > 0 && node2hdr.count > 0 &&
|
|
((be32_to_cpu(btree2[0].hashval) < be32_to_cpu(btree1[0].hashval)) ||
|
|
(be32_to_cpu(btree2[node2hdr.count - 1].hashval) <
|
|
be32_to_cpu(btree1[node1hdr.count - 1].hashval)))) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Link a new block into a doubly linked list of blocks (of whatever type).
|
|
*/
|
|
int /* error */
|
|
xfs_da3_blk_link(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_blk *old_blk,
|
|
struct xfs_da_state_blk *new_blk)
|
|
{
|
|
struct xfs_da_blkinfo *old_info;
|
|
struct xfs_da_blkinfo *new_info;
|
|
struct xfs_da_blkinfo *tmp_info;
|
|
struct xfs_da_args *args;
|
|
struct xfs_buf *bp;
|
|
int before = 0;
|
|
int error;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
/*
|
|
* Set up environment.
|
|
*/
|
|
args = state->args;
|
|
ASSERT(args != NULL);
|
|
old_info = old_blk->bp->b_addr;
|
|
new_info = new_blk->bp->b_addr;
|
|
ASSERT(old_blk->magic == XFS_DA_NODE_MAGIC ||
|
|
old_blk->magic == XFS_DIR2_LEAFN_MAGIC ||
|
|
old_blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
|
|
switch (old_blk->magic) {
|
|
case XFS_ATTR_LEAF_MAGIC:
|
|
before = xfs_attr_leaf_order(old_blk->bp, new_blk->bp);
|
|
break;
|
|
case XFS_DIR2_LEAFN_MAGIC:
|
|
before = xfs_dir2_leafn_order(dp, old_blk->bp, new_blk->bp);
|
|
break;
|
|
case XFS_DA_NODE_MAGIC:
|
|
before = xfs_da3_node_order(dp, old_blk->bp, new_blk->bp);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Link blocks in appropriate order.
|
|
*/
|
|
if (before) {
|
|
/*
|
|
* Link new block in before existing block.
|
|
*/
|
|
trace_xfs_da_link_before(args);
|
|
new_info->forw = cpu_to_be32(old_blk->blkno);
|
|
new_info->back = old_info->back;
|
|
if (old_info->back) {
|
|
error = xfs_da3_node_read(args->trans, dp,
|
|
be32_to_cpu(old_info->back),
|
|
-1, &bp, args->whichfork);
|
|
if (error)
|
|
return error;
|
|
ASSERT(bp != NULL);
|
|
tmp_info = bp->b_addr;
|
|
ASSERT(tmp_info->magic == old_info->magic);
|
|
ASSERT(be32_to_cpu(tmp_info->forw) == old_blk->blkno);
|
|
tmp_info->forw = cpu_to_be32(new_blk->blkno);
|
|
xfs_trans_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1);
|
|
}
|
|
old_info->back = cpu_to_be32(new_blk->blkno);
|
|
} else {
|
|
/*
|
|
* Link new block in after existing block.
|
|
*/
|
|
trace_xfs_da_link_after(args);
|
|
new_info->forw = old_info->forw;
|
|
new_info->back = cpu_to_be32(old_blk->blkno);
|
|
if (old_info->forw) {
|
|
error = xfs_da3_node_read(args->trans, dp,
|
|
be32_to_cpu(old_info->forw),
|
|
-1, &bp, args->whichfork);
|
|
if (error)
|
|
return error;
|
|
ASSERT(bp != NULL);
|
|
tmp_info = bp->b_addr;
|
|
ASSERT(tmp_info->magic == old_info->magic);
|
|
ASSERT(be32_to_cpu(tmp_info->back) == old_blk->blkno);
|
|
tmp_info->back = cpu_to_be32(new_blk->blkno);
|
|
xfs_trans_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1);
|
|
}
|
|
old_info->forw = cpu_to_be32(new_blk->blkno);
|
|
}
|
|
|
|
xfs_trans_log_buf(args->trans, old_blk->bp, 0, sizeof(*tmp_info) - 1);
|
|
xfs_trans_log_buf(args->trans, new_blk->bp, 0, sizeof(*tmp_info) - 1);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Unlink a block from a doubly linked list of blocks.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_da3_blk_unlink(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_blk *drop_blk,
|
|
struct xfs_da_state_blk *save_blk)
|
|
{
|
|
struct xfs_da_blkinfo *drop_info;
|
|
struct xfs_da_blkinfo *save_info;
|
|
struct xfs_da_blkinfo *tmp_info;
|
|
struct xfs_da_args *args;
|
|
struct xfs_buf *bp;
|
|
int error;
|
|
|
|
/*
|
|
* Set up environment.
|
|
*/
|
|
args = state->args;
|
|
ASSERT(args != NULL);
|
|
save_info = save_blk->bp->b_addr;
|
|
drop_info = drop_blk->bp->b_addr;
|
|
ASSERT(save_blk->magic == XFS_DA_NODE_MAGIC ||
|
|
save_blk->magic == XFS_DIR2_LEAFN_MAGIC ||
|
|
save_blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
ASSERT(save_blk->magic == drop_blk->magic);
|
|
ASSERT((be32_to_cpu(save_info->forw) == drop_blk->blkno) ||
|
|
(be32_to_cpu(save_info->back) == drop_blk->blkno));
|
|
ASSERT((be32_to_cpu(drop_info->forw) == save_blk->blkno) ||
|
|
(be32_to_cpu(drop_info->back) == save_blk->blkno));
|
|
|
|
/*
|
|
* Unlink the leaf block from the doubly linked chain of leaves.
|
|
*/
|
|
if (be32_to_cpu(save_info->back) == drop_blk->blkno) {
|
|
trace_xfs_da_unlink_back(args);
|
|
save_info->back = drop_info->back;
|
|
if (drop_info->back) {
|
|
error = xfs_da3_node_read(args->trans, args->dp,
|
|
be32_to_cpu(drop_info->back),
|
|
-1, &bp, args->whichfork);
|
|
if (error)
|
|
return error;
|
|
ASSERT(bp != NULL);
|
|
tmp_info = bp->b_addr;
|
|
ASSERT(tmp_info->magic == save_info->magic);
|
|
ASSERT(be32_to_cpu(tmp_info->forw) == drop_blk->blkno);
|
|
tmp_info->forw = cpu_to_be32(save_blk->blkno);
|
|
xfs_trans_log_buf(args->trans, bp, 0,
|
|
sizeof(*tmp_info) - 1);
|
|
}
|
|
} else {
|
|
trace_xfs_da_unlink_forward(args);
|
|
save_info->forw = drop_info->forw;
|
|
if (drop_info->forw) {
|
|
error = xfs_da3_node_read(args->trans, args->dp,
|
|
be32_to_cpu(drop_info->forw),
|
|
-1, &bp, args->whichfork);
|
|
if (error)
|
|
return error;
|
|
ASSERT(bp != NULL);
|
|
tmp_info = bp->b_addr;
|
|
ASSERT(tmp_info->magic == save_info->magic);
|
|
ASSERT(be32_to_cpu(tmp_info->back) == drop_blk->blkno);
|
|
tmp_info->back = cpu_to_be32(save_blk->blkno);
|
|
xfs_trans_log_buf(args->trans, bp, 0,
|
|
sizeof(*tmp_info) - 1);
|
|
}
|
|
}
|
|
|
|
xfs_trans_log_buf(args->trans, save_blk->bp, 0, sizeof(*save_info) - 1);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Move a path "forward" or "!forward" one block at the current level.
|
|
*
|
|
* This routine will adjust a "path" to point to the next block
|
|
* "forward" (higher hashvalues) or "!forward" (lower hashvals) in the
|
|
* Btree, including updating pointers to the intermediate nodes between
|
|
* the new bottom and the root.
|
|
*/
|
|
int /* error */
|
|
xfs_da3_path_shift(
|
|
struct xfs_da_state *state,
|
|
struct xfs_da_state_path *path,
|
|
int forward,
|
|
int release,
|
|
int *result)
|
|
{
|
|
struct xfs_da_state_blk *blk;
|
|
struct xfs_da_blkinfo *info;
|
|
struct xfs_da_intnode *node;
|
|
struct xfs_da_args *args;
|
|
struct xfs_da_node_entry *btree;
|
|
struct xfs_da3_icnode_hdr nodehdr;
|
|
xfs_dablk_t blkno = 0;
|
|
int level;
|
|
int error;
|
|
struct xfs_inode *dp = state->args->dp;
|
|
|
|
trace_xfs_da_path_shift(state->args);
|
|
|
|
/*
|
|
* Roll up the Btree looking for the first block where our
|
|
* current index is not at the edge of the block. Note that
|
|
* we skip the bottom layer because we want the sibling block.
|
|
*/
|
|
args = state->args;
|
|
ASSERT(args != NULL);
|
|
ASSERT(path != NULL);
|
|
ASSERT((path->active > 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
|
|
level = (path->active-1) - 1; /* skip bottom layer in path */
|
|
for (blk = &path->blk[level]; level >= 0; blk--, level--) {
|
|
node = blk->bp->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
btree = dp->d_ops->node_tree_p(node);
|
|
|
|
if (forward && (blk->index < nodehdr.count - 1)) {
|
|
blk->index++;
|
|
blkno = be32_to_cpu(btree[blk->index].before);
|
|
break;
|
|
} else if (!forward && (blk->index > 0)) {
|
|
blk->index--;
|
|
blkno = be32_to_cpu(btree[blk->index].before);
|
|
break;
|
|
}
|
|
}
|
|
if (level < 0) {
|
|
*result = -ENOENT; /* we're out of our tree */
|
|
ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Roll down the edge of the subtree until we reach the
|
|
* same depth we were at originally.
|
|
*/
|
|
for (blk++, level++; level < path->active; blk++, level++) {
|
|
/*
|
|
* Release the old block.
|
|
* (if it's dirty, trans won't actually let go)
|
|
*/
|
|
if (release)
|
|
xfs_trans_brelse(args->trans, blk->bp);
|
|
|
|
/*
|
|
* Read the next child block.
|
|
*/
|
|
blk->blkno = blkno;
|
|
error = xfs_da3_node_read(args->trans, dp, blkno, -1,
|
|
&blk->bp, args->whichfork);
|
|
if (error)
|
|
return error;
|
|
info = blk->bp->b_addr;
|
|
ASSERT(info->magic == cpu_to_be16(XFS_DA_NODE_MAGIC) ||
|
|
info->magic == cpu_to_be16(XFS_DA3_NODE_MAGIC) ||
|
|
info->magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
|
|
info->magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC) ||
|
|
info->magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC) ||
|
|
info->magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC));
|
|
|
|
|
|
/*
|
|
* Note: we flatten the magic number to a single type so we
|
|
* don't have to compare against crc/non-crc types elsewhere.
|
|
*/
|
|
switch (be16_to_cpu(info->magic)) {
|
|
case XFS_DA_NODE_MAGIC:
|
|
case XFS_DA3_NODE_MAGIC:
|
|
blk->magic = XFS_DA_NODE_MAGIC;
|
|
node = (xfs_da_intnode_t *)info;
|
|
dp->d_ops->node_hdr_from_disk(&nodehdr, node);
|
|
btree = dp->d_ops->node_tree_p(node);
|
|
blk->hashval = be32_to_cpu(btree[nodehdr.count - 1].hashval);
|
|
if (forward)
|
|
blk->index = 0;
|
|
else
|
|
blk->index = nodehdr.count - 1;
|
|
blkno = be32_to_cpu(btree[blk->index].before);
|
|
break;
|
|
case XFS_ATTR_LEAF_MAGIC:
|
|
case XFS_ATTR3_LEAF_MAGIC:
|
|
blk->magic = XFS_ATTR_LEAF_MAGIC;
|
|
ASSERT(level == path->active-1);
|
|
blk->index = 0;
|
|
blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL);
|
|
break;
|
|
case XFS_DIR2_LEAFN_MAGIC:
|
|
case XFS_DIR3_LEAFN_MAGIC:
|
|
blk->magic = XFS_DIR2_LEAFN_MAGIC;
|
|
ASSERT(level == path->active-1);
|
|
blk->index = 0;
|
|
blk->hashval = xfs_dir2_leafn_lasthash(args->dp,
|
|
blk->bp, NULL);
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
break;
|
|
}
|
|
}
|
|
*result = 0;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*========================================================================
|
|
* Utility routines.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Implement a simple hash on a character string.
|
|
* Rotate the hash value by 7 bits, then XOR each character in.
|
|
* This is implemented with some source-level loop unrolling.
|
|
*/
|
|
xfs_dahash_t
|
|
xfs_da_hashname(const __uint8_t *name, int namelen)
|
|
{
|
|
xfs_dahash_t hash;
|
|
|
|
/*
|
|
* Do four characters at a time as long as we can.
|
|
*/
|
|
for (hash = 0; namelen >= 4; namelen -= 4, name += 4)
|
|
hash = (name[0] << 21) ^ (name[1] << 14) ^ (name[2] << 7) ^
|
|
(name[3] << 0) ^ rol32(hash, 7 * 4);
|
|
|
|
/*
|
|
* Now do the rest of the characters.
|
|
*/
|
|
switch (namelen) {
|
|
case 3:
|
|
return (name[0] << 14) ^ (name[1] << 7) ^ (name[2] << 0) ^
|
|
rol32(hash, 7 * 3);
|
|
case 2:
|
|
return (name[0] << 7) ^ (name[1] << 0) ^ rol32(hash, 7 * 2);
|
|
case 1:
|
|
return (name[0] << 0) ^ rol32(hash, 7 * 1);
|
|
default: /* case 0: */
|
|
return hash;
|
|
}
|
|
}
|
|
|
|
enum xfs_dacmp
|
|
xfs_da_compname(
|
|
struct xfs_da_args *args,
|
|
const unsigned char *name,
|
|
int len)
|
|
{
|
|
return (args->namelen == len && memcmp(args->name, name, len) == 0) ?
|
|
XFS_CMP_EXACT : XFS_CMP_DIFFERENT;
|
|
}
|
|
|
|
static xfs_dahash_t
|
|
xfs_default_hashname(
|
|
struct xfs_name *name)
|
|
{
|
|
return xfs_da_hashname(name->name, name->len);
|
|
}
|
|
|
|
const struct xfs_nameops xfs_default_nameops = {
|
|
.hashname = xfs_default_hashname,
|
|
.compname = xfs_da_compname
|
|
};
|
|
|
|
int
|
|
xfs_da_grow_inode_int(
|
|
struct xfs_da_args *args,
|
|
xfs_fileoff_t *bno,
|
|
int count)
|
|
{
|
|
struct xfs_trans *tp = args->trans;
|
|
struct xfs_inode *dp = args->dp;
|
|
int w = args->whichfork;
|
|
xfs_rfsblock_t nblks = dp->i_d.di_nblocks;
|
|
struct xfs_bmbt_irec map, *mapp;
|
|
int nmap, error, got, i, mapi;
|
|
|
|
/*
|
|
* Find a spot in the file space to put the new block.
|
|
*/
|
|
error = xfs_bmap_first_unused(tp, dp, count, bno, w);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Try mapping it in one filesystem block.
|
|
*/
|
|
nmap = 1;
|
|
ASSERT(args->firstblock != NULL);
|
|
error = xfs_bmapi_write(tp, dp, *bno, count,
|
|
xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
|
|
args->firstblock, args->total, &map, &nmap,
|
|
args->flist);
|
|
if (error)
|
|
return error;
|
|
|
|
ASSERT(nmap <= 1);
|
|
if (nmap == 1) {
|
|
mapp = ↦
|
|
mapi = 1;
|
|
} else if (nmap == 0 && count > 1) {
|
|
xfs_fileoff_t b;
|
|
int c;
|
|
|
|
/*
|
|
* If we didn't get it and the block might work if fragmented,
|
|
* try without the CONTIG flag. Loop until we get it all.
|
|
*/
|
|
mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
|
|
for (b = *bno, mapi = 0; b < *bno + count; ) {
|
|
nmap = MIN(XFS_BMAP_MAX_NMAP, count);
|
|
c = (int)(*bno + count - b);
|
|
error = xfs_bmapi_write(tp, dp, b, c,
|
|
xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA,
|
|
args->firstblock, args->total,
|
|
&mapp[mapi], &nmap, args->flist);
|
|
if (error)
|
|
goto out_free_map;
|
|
if (nmap < 1)
|
|
break;
|
|
mapi += nmap;
|
|
b = mapp[mapi - 1].br_startoff +
|
|
mapp[mapi - 1].br_blockcount;
|
|
}
|
|
} else {
|
|
mapi = 0;
|
|
mapp = NULL;
|
|
}
|
|
|
|
/*
|
|
* Count the blocks we got, make sure it matches the total.
|
|
*/
|
|
for (i = 0, got = 0; i < mapi; i++)
|
|
got += mapp[i].br_blockcount;
|
|
if (got != count || mapp[0].br_startoff != *bno ||
|
|
mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
|
|
*bno + count) {
|
|
error = -ENOSPC;
|
|
goto out_free_map;
|
|
}
|
|
|
|
/* account for newly allocated blocks in reserved blocks total */
|
|
args->total -= dp->i_d.di_nblocks - nblks;
|
|
|
|
out_free_map:
|
|
if (mapp != &map)
|
|
kmem_free(mapp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Add a block to the btree ahead of the file.
|
|
* Return the new block number to the caller.
|
|
*/
|
|
int
|
|
xfs_da_grow_inode(
|
|
struct xfs_da_args *args,
|
|
xfs_dablk_t *new_blkno)
|
|
{
|
|
xfs_fileoff_t bno;
|
|
int error;
|
|
|
|
trace_xfs_da_grow_inode(args);
|
|
|
|
bno = args->geo->leafblk;
|
|
error = xfs_da_grow_inode_int(args, &bno, args->geo->fsbcount);
|
|
if (!error)
|
|
*new_blkno = (xfs_dablk_t)bno;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Ick. We need to always be able to remove a btree block, even
|
|
* if there's no space reservation because the filesystem is full.
|
|
* This is called if xfs_bunmapi on a btree block fails due to ENOSPC.
|
|
* It swaps the target block with the last block in the file. The
|
|
* last block in the file can always be removed since it can't cause
|
|
* a bmap btree split to do that.
|
|
*/
|
|
STATIC int
|
|
xfs_da3_swap_lastblock(
|
|
struct xfs_da_args *args,
|
|
xfs_dablk_t *dead_blknop,
|
|
struct xfs_buf **dead_bufp)
|
|
{
|
|
struct xfs_da_blkinfo *dead_info;
|
|
struct xfs_da_blkinfo *sib_info;
|
|
struct xfs_da_intnode *par_node;
|
|
struct xfs_da_intnode *dead_node;
|
|
struct xfs_dir2_leaf *dead_leaf2;
|
|
struct xfs_da_node_entry *btree;
|
|
struct xfs_da3_icnode_hdr par_hdr;
|
|
struct xfs_inode *dp;
|
|
struct xfs_trans *tp;
|
|
struct xfs_mount *mp;
|
|
struct xfs_buf *dead_buf;
|
|
struct xfs_buf *last_buf;
|
|
struct xfs_buf *sib_buf;
|
|
struct xfs_buf *par_buf;
|
|
xfs_dahash_t dead_hash;
|
|
xfs_fileoff_t lastoff;
|
|
xfs_dablk_t dead_blkno;
|
|
xfs_dablk_t last_blkno;
|
|
xfs_dablk_t sib_blkno;
|
|
xfs_dablk_t par_blkno;
|
|
int error;
|
|
int w;
|
|
int entno;
|
|
int level;
|
|
int dead_level;
|
|
|
|
trace_xfs_da_swap_lastblock(args);
|
|
|
|
dead_buf = *dead_bufp;
|
|
dead_blkno = *dead_blknop;
|
|
tp = args->trans;
|
|
dp = args->dp;
|
|
w = args->whichfork;
|
|
ASSERT(w == XFS_DATA_FORK);
|
|
mp = dp->i_mount;
|
|
lastoff = args->geo->freeblk;
|
|
error = xfs_bmap_last_before(tp, dp, &lastoff, w);
|
|
if (error)
|
|
return error;
|
|
if (unlikely(lastoff == 0)) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(1)", XFS_ERRLEVEL_LOW,
|
|
mp);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
/*
|
|
* Read the last block in the btree space.
|
|
*/
|
|
last_blkno = (xfs_dablk_t)lastoff - args->geo->fsbcount;
|
|
error = xfs_da3_node_read(tp, dp, last_blkno, -1, &last_buf, w);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Copy the last block into the dead buffer and log it.
|
|
*/
|
|
memcpy(dead_buf->b_addr, last_buf->b_addr, args->geo->blksize);
|
|
xfs_trans_log_buf(tp, dead_buf, 0, args->geo->blksize - 1);
|
|
dead_info = dead_buf->b_addr;
|
|
/*
|
|
* Get values from the moved block.
|
|
*/
|
|
if (dead_info->magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
|
|
dead_info->magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)) {
|
|
struct xfs_dir3_icleaf_hdr leafhdr;
|
|
struct xfs_dir2_leaf_entry *ents;
|
|
|
|
dead_leaf2 = (xfs_dir2_leaf_t *)dead_info;
|
|
dp->d_ops->leaf_hdr_from_disk(&leafhdr, dead_leaf2);
|
|
ents = dp->d_ops->leaf_ents_p(dead_leaf2);
|
|
dead_level = 0;
|
|
dead_hash = be32_to_cpu(ents[leafhdr.count - 1].hashval);
|
|
} else {
|
|
struct xfs_da3_icnode_hdr deadhdr;
|
|
|
|
dead_node = (xfs_da_intnode_t *)dead_info;
|
|
dp->d_ops->node_hdr_from_disk(&deadhdr, dead_node);
|
|
btree = dp->d_ops->node_tree_p(dead_node);
|
|
dead_level = deadhdr.level;
|
|
dead_hash = be32_to_cpu(btree[deadhdr.count - 1].hashval);
|
|
}
|
|
sib_buf = par_buf = NULL;
|
|
/*
|
|
* If the moved block has a left sibling, fix up the pointers.
|
|
*/
|
|
if ((sib_blkno = be32_to_cpu(dead_info->back))) {
|
|
error = xfs_da3_node_read(tp, dp, sib_blkno, -1, &sib_buf, w);
|
|
if (error)
|
|
goto done;
|
|
sib_info = sib_buf->b_addr;
|
|
if (unlikely(
|
|
be32_to_cpu(sib_info->forw) != last_blkno ||
|
|
sib_info->magic != dead_info->magic)) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(2)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
sib_info->forw = cpu_to_be32(dead_blkno);
|
|
xfs_trans_log_buf(tp, sib_buf,
|
|
XFS_DA_LOGRANGE(sib_info, &sib_info->forw,
|
|
sizeof(sib_info->forw)));
|
|
sib_buf = NULL;
|
|
}
|
|
/*
|
|
* If the moved block has a right sibling, fix up the pointers.
|
|
*/
|
|
if ((sib_blkno = be32_to_cpu(dead_info->forw))) {
|
|
error = xfs_da3_node_read(tp, dp, sib_blkno, -1, &sib_buf, w);
|
|
if (error)
|
|
goto done;
|
|
sib_info = sib_buf->b_addr;
|
|
if (unlikely(
|
|
be32_to_cpu(sib_info->back) != last_blkno ||
|
|
sib_info->magic != dead_info->magic)) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(3)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
sib_info->back = cpu_to_be32(dead_blkno);
|
|
xfs_trans_log_buf(tp, sib_buf,
|
|
XFS_DA_LOGRANGE(sib_info, &sib_info->back,
|
|
sizeof(sib_info->back)));
|
|
sib_buf = NULL;
|
|
}
|
|
par_blkno = args->geo->leafblk;
|
|
level = -1;
|
|
/*
|
|
* Walk down the tree looking for the parent of the moved block.
|
|
*/
|
|
for (;;) {
|
|
error = xfs_da3_node_read(tp, dp, par_blkno, -1, &par_buf, w);
|
|
if (error)
|
|
goto done;
|
|
par_node = par_buf->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&par_hdr, par_node);
|
|
if (level >= 0 && level != par_hdr.level + 1) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(4)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
level = par_hdr.level;
|
|
btree = dp->d_ops->node_tree_p(par_node);
|
|
for (entno = 0;
|
|
entno < par_hdr.count &&
|
|
be32_to_cpu(btree[entno].hashval) < dead_hash;
|
|
entno++)
|
|
continue;
|
|
if (entno == par_hdr.count) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(5)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
par_blkno = be32_to_cpu(btree[entno].before);
|
|
if (level == dead_level + 1)
|
|
break;
|
|
xfs_trans_brelse(tp, par_buf);
|
|
par_buf = NULL;
|
|
}
|
|
/*
|
|
* We're in the right parent block.
|
|
* Look for the right entry.
|
|
*/
|
|
for (;;) {
|
|
for (;
|
|
entno < par_hdr.count &&
|
|
be32_to_cpu(btree[entno].before) != last_blkno;
|
|
entno++)
|
|
continue;
|
|
if (entno < par_hdr.count)
|
|
break;
|
|
par_blkno = par_hdr.forw;
|
|
xfs_trans_brelse(tp, par_buf);
|
|
par_buf = NULL;
|
|
if (unlikely(par_blkno == 0)) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(6)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_da3_node_read(tp, dp, par_blkno, -1, &par_buf, w);
|
|
if (error)
|
|
goto done;
|
|
par_node = par_buf->b_addr;
|
|
dp->d_ops->node_hdr_from_disk(&par_hdr, par_node);
|
|
if (par_hdr.level != level) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(7)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
btree = dp->d_ops->node_tree_p(par_node);
|
|
entno = 0;
|
|
}
|
|
/*
|
|
* Update the parent entry pointing to the moved block.
|
|
*/
|
|
btree[entno].before = cpu_to_be32(dead_blkno);
|
|
xfs_trans_log_buf(tp, par_buf,
|
|
XFS_DA_LOGRANGE(par_node, &btree[entno].before,
|
|
sizeof(btree[entno].before)));
|
|
*dead_blknop = last_blkno;
|
|
*dead_bufp = last_buf;
|
|
return 0;
|
|
done:
|
|
if (par_buf)
|
|
xfs_trans_brelse(tp, par_buf);
|
|
if (sib_buf)
|
|
xfs_trans_brelse(tp, sib_buf);
|
|
xfs_trans_brelse(tp, last_buf);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Remove a btree block from a directory or attribute.
|
|
*/
|
|
int
|
|
xfs_da_shrink_inode(
|
|
xfs_da_args_t *args,
|
|
xfs_dablk_t dead_blkno,
|
|
struct xfs_buf *dead_buf)
|
|
{
|
|
xfs_inode_t *dp;
|
|
int done, error, w, count;
|
|
xfs_trans_t *tp;
|
|
xfs_mount_t *mp;
|
|
|
|
trace_xfs_da_shrink_inode(args);
|
|
|
|
dp = args->dp;
|
|
w = args->whichfork;
|
|
tp = args->trans;
|
|
mp = dp->i_mount;
|
|
count = args->geo->fsbcount;
|
|
for (;;) {
|
|
/*
|
|
* Remove extents. If we get ENOSPC for a dir we have to move
|
|
* the last block to the place we want to kill.
|
|
*/
|
|
error = xfs_bunmapi(tp, dp, dead_blkno, count,
|
|
xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA,
|
|
0, args->firstblock, args->flist, &done);
|
|
if (error == -ENOSPC) {
|
|
if (w != XFS_DATA_FORK)
|
|
break;
|
|
error = xfs_da3_swap_lastblock(args, &dead_blkno,
|
|
&dead_buf);
|
|
if (error)
|
|
break;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
xfs_trans_binval(tp, dead_buf);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* See if the mapping(s) for this btree block are valid, i.e.
|
|
* don't contain holes, are logically contiguous, and cover the whole range.
|
|
*/
|
|
STATIC int
|
|
xfs_da_map_covers_blocks(
|
|
int nmap,
|
|
xfs_bmbt_irec_t *mapp,
|
|
xfs_dablk_t bno,
|
|
int count)
|
|
{
|
|
int i;
|
|
xfs_fileoff_t off;
|
|
|
|
for (i = 0, off = bno; i < nmap; i++) {
|
|
if (mapp[i].br_startblock == HOLESTARTBLOCK ||
|
|
mapp[i].br_startblock == DELAYSTARTBLOCK) {
|
|
return 0;
|
|
}
|
|
if (off != mapp[i].br_startoff) {
|
|
return 0;
|
|
}
|
|
off += mapp[i].br_blockcount;
|
|
}
|
|
return off == bno + count;
|
|
}
|
|
|
|
/*
|
|
* Convert a struct xfs_bmbt_irec to a struct xfs_buf_map.
|
|
*
|
|
* For the single map case, it is assumed that the caller has provided a pointer
|
|
* to a valid xfs_buf_map. For the multiple map case, this function will
|
|
* allocate the xfs_buf_map to hold all the maps and replace the caller's single
|
|
* map pointer with the allocated map.
|
|
*/
|
|
static int
|
|
xfs_buf_map_from_irec(
|
|
struct xfs_mount *mp,
|
|
struct xfs_buf_map **mapp,
|
|
int *nmaps,
|
|
struct xfs_bmbt_irec *irecs,
|
|
int nirecs)
|
|
{
|
|
struct xfs_buf_map *map;
|
|
int i;
|
|
|
|
ASSERT(*nmaps == 1);
|
|
ASSERT(nirecs >= 1);
|
|
|
|
if (nirecs > 1) {
|
|
map = kmem_zalloc(nirecs * sizeof(struct xfs_buf_map),
|
|
KM_SLEEP | KM_NOFS);
|
|
if (!map)
|
|
return -ENOMEM;
|
|
*mapp = map;
|
|
}
|
|
|
|
*nmaps = nirecs;
|
|
map = *mapp;
|
|
for (i = 0; i < *nmaps; i++) {
|
|
ASSERT(irecs[i].br_startblock != DELAYSTARTBLOCK &&
|
|
irecs[i].br_startblock != HOLESTARTBLOCK);
|
|
map[i].bm_bn = XFS_FSB_TO_DADDR(mp, irecs[i].br_startblock);
|
|
map[i].bm_len = XFS_FSB_TO_BB(mp, irecs[i].br_blockcount);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Map the block we are given ready for reading. There are three possible return
|
|
* values:
|
|
* -1 - will be returned if we land in a hole and mappedbno == -2 so the
|
|
* caller knows not to execute a subsequent read.
|
|
* 0 - if we mapped the block successfully
|
|
* >0 - positive error number if there was an error.
|
|
*/
|
|
static int
|
|
xfs_dabuf_map(
|
|
struct xfs_inode *dp,
|
|
xfs_dablk_t bno,
|
|
xfs_daddr_t mappedbno,
|
|
int whichfork,
|
|
struct xfs_buf_map **map,
|
|
int *nmaps)
|
|
{
|
|
struct xfs_mount *mp = dp->i_mount;
|
|
int nfsb;
|
|
int error = 0;
|
|
struct xfs_bmbt_irec irec;
|
|
struct xfs_bmbt_irec *irecs = &irec;
|
|
int nirecs;
|
|
|
|
ASSERT(map && *map);
|
|
ASSERT(*nmaps == 1);
|
|
|
|
if (whichfork == XFS_DATA_FORK)
|
|
nfsb = mp->m_dir_geo->fsbcount;
|
|
else
|
|
nfsb = mp->m_attr_geo->fsbcount;
|
|
|
|
/*
|
|
* Caller doesn't have a mapping. -2 means don't complain
|
|
* if we land in a hole.
|
|
*/
|
|
if (mappedbno == -1 || mappedbno == -2) {
|
|
/*
|
|
* Optimize the one-block case.
|
|
*/
|
|
if (nfsb != 1)
|
|
irecs = kmem_zalloc(sizeof(irec) * nfsb,
|
|
KM_SLEEP | KM_NOFS);
|
|
|
|
nirecs = nfsb;
|
|
error = xfs_bmapi_read(dp, (xfs_fileoff_t)bno, nfsb, irecs,
|
|
&nirecs, xfs_bmapi_aflag(whichfork));
|
|
if (error)
|
|
goto out;
|
|
} else {
|
|
irecs->br_startblock = XFS_DADDR_TO_FSB(mp, mappedbno);
|
|
irecs->br_startoff = (xfs_fileoff_t)bno;
|
|
irecs->br_blockcount = nfsb;
|
|
irecs->br_state = 0;
|
|
nirecs = 1;
|
|
}
|
|
|
|
if (!xfs_da_map_covers_blocks(nirecs, irecs, bno, nfsb)) {
|
|
error = mappedbno == -2 ? -1 : -EFSCORRUPTED;
|
|
if (unlikely(error == -EFSCORRUPTED)) {
|
|
if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
|
|
int i;
|
|
xfs_alert(mp, "%s: bno %lld dir: inode %lld",
|
|
__func__, (long long)bno,
|
|
(long long)dp->i_ino);
|
|
for (i = 0; i < *nmaps; i++) {
|
|
xfs_alert(mp,
|
|
"[%02d] br_startoff %lld br_startblock %lld br_blockcount %lld br_state %d",
|
|
i,
|
|
(long long)irecs[i].br_startoff,
|
|
(long long)irecs[i].br_startblock,
|
|
(long long)irecs[i].br_blockcount,
|
|
irecs[i].br_state);
|
|
}
|
|
}
|
|
XFS_ERROR_REPORT("xfs_da_do_buf(1)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
}
|
|
goto out;
|
|
}
|
|
error = xfs_buf_map_from_irec(mp, map, nmaps, irecs, nirecs);
|
|
out:
|
|
if (irecs != &irec)
|
|
kmem_free(irecs);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Get a buffer for the dir/attr block.
|
|
*/
|
|
int
|
|
xfs_da_get_buf(
|
|
struct xfs_trans *trans,
|
|
struct xfs_inode *dp,
|
|
xfs_dablk_t bno,
|
|
xfs_daddr_t mappedbno,
|
|
struct xfs_buf **bpp,
|
|
int whichfork)
|
|
{
|
|
struct xfs_buf *bp;
|
|
struct xfs_buf_map map;
|
|
struct xfs_buf_map *mapp;
|
|
int nmap;
|
|
int error;
|
|
|
|
*bpp = NULL;
|
|
mapp = ↦
|
|
nmap = 1;
|
|
error = xfs_dabuf_map(dp, bno, mappedbno, whichfork,
|
|
&mapp, &nmap);
|
|
if (error) {
|
|
/* mapping a hole is not an error, but we don't continue */
|
|
if (error == -1)
|
|
error = 0;
|
|
goto out_free;
|
|
}
|
|
|
|
bp = xfs_trans_get_buf_map(trans, dp->i_mount->m_ddev_targp,
|
|
mapp, nmap, 0);
|
|
error = bp ? bp->b_error : -EIO;
|
|
if (error) {
|
|
xfs_trans_brelse(trans, bp);
|
|
goto out_free;
|
|
}
|
|
|
|
*bpp = bp;
|
|
|
|
out_free:
|
|
if (mapp != &map)
|
|
kmem_free(mapp);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Get a buffer for the dir/attr block, fill in the contents.
|
|
*/
|
|
int
|
|
xfs_da_read_buf(
|
|
struct xfs_trans *trans,
|
|
struct xfs_inode *dp,
|
|
xfs_dablk_t bno,
|
|
xfs_daddr_t mappedbno,
|
|
struct xfs_buf **bpp,
|
|
int whichfork,
|
|
const struct xfs_buf_ops *ops)
|
|
{
|
|
struct xfs_buf *bp;
|
|
struct xfs_buf_map map;
|
|
struct xfs_buf_map *mapp;
|
|
int nmap;
|
|
int error;
|
|
|
|
*bpp = NULL;
|
|
mapp = ↦
|
|
nmap = 1;
|
|
error = xfs_dabuf_map(dp, bno, mappedbno, whichfork,
|
|
&mapp, &nmap);
|
|
if (error) {
|
|
/* mapping a hole is not an error, but we don't continue */
|
|
if (error == -1)
|
|
error = 0;
|
|
goto out_free;
|
|
}
|
|
|
|
error = xfs_trans_read_buf_map(dp->i_mount, trans,
|
|
dp->i_mount->m_ddev_targp,
|
|
mapp, nmap, 0, &bp, ops);
|
|
if (error)
|
|
goto out_free;
|
|
|
|
if (whichfork == XFS_ATTR_FORK)
|
|
xfs_buf_set_ref(bp, XFS_ATTR_BTREE_REF);
|
|
else
|
|
xfs_buf_set_ref(bp, XFS_DIR_BTREE_REF);
|
|
*bpp = bp;
|
|
out_free:
|
|
if (mapp != &map)
|
|
kmem_free(mapp);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Readahead the dir/attr block.
|
|
*/
|
|
xfs_daddr_t
|
|
xfs_da_reada_buf(
|
|
struct xfs_inode *dp,
|
|
xfs_dablk_t bno,
|
|
xfs_daddr_t mappedbno,
|
|
int whichfork,
|
|
const struct xfs_buf_ops *ops)
|
|
{
|
|
struct xfs_buf_map map;
|
|
struct xfs_buf_map *mapp;
|
|
int nmap;
|
|
int error;
|
|
|
|
mapp = ↦
|
|
nmap = 1;
|
|
error = xfs_dabuf_map(dp, bno, mappedbno, whichfork,
|
|
&mapp, &nmap);
|
|
if (error) {
|
|
/* mapping a hole is not an error, but we don't continue */
|
|
if (error == -1)
|
|
error = 0;
|
|
goto out_free;
|
|
}
|
|
|
|
mappedbno = mapp[0].bm_bn;
|
|
xfs_buf_readahead_map(dp->i_mount->m_ddev_targp, mapp, nmap, ops);
|
|
|
|
out_free:
|
|
if (mapp != &map)
|
|
kmem_free(mapp);
|
|
|
|
if (error)
|
|
return -1;
|
|
return mappedbno;
|
|
}
|