628 строки
17 KiB
C
628 строки
17 KiB
C
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/*
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* sufile.c - NILFS segment usage file.
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*
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* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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 to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>.
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/buffer_head.h>
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#include <linux/errno.h>
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#include <linux/nilfs2_fs.h>
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#include "mdt.h"
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#include "sufile.h"
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static inline unsigned long
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nilfs_sufile_segment_usages_per_block(const struct inode *sufile)
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{
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return NILFS_MDT(sufile)->mi_entries_per_block;
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}
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static unsigned long
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nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum)
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{
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__u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
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do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
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return (unsigned long)t;
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}
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static unsigned long
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nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum)
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{
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__u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
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return do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
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}
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static unsigned long
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nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr,
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__u64 max)
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{
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return min_t(unsigned long,
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nilfs_sufile_segment_usages_per_block(sufile) -
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nilfs_sufile_get_offset(sufile, curr),
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max - curr + 1);
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}
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static inline struct nilfs_sufile_header *
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nilfs_sufile_block_get_header(const struct inode *sufile,
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struct buffer_head *bh,
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void *kaddr)
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{
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return kaddr + bh_offset(bh);
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}
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static struct nilfs_segment_usage *
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nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum,
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struct buffer_head *bh, void *kaddr)
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{
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return kaddr + bh_offset(bh) +
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nilfs_sufile_get_offset(sufile, segnum) *
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NILFS_MDT(sufile)->mi_entry_size;
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}
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static inline int nilfs_sufile_get_header_block(struct inode *sufile,
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struct buffer_head **bhp)
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{
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return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp);
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}
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static inline int
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nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum,
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int create, struct buffer_head **bhp)
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{
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return nilfs_mdt_get_block(sufile,
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nilfs_sufile_get_blkoff(sufile, segnum),
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create, NULL, bhp);
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}
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/**
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* nilfs_sufile_alloc - allocate a segment
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* @sufile: inode of segment usage file
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* @segnump: pointer to segment number
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*
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* Description: nilfs_sufile_alloc() allocates a clean segment.
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*
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* Return Value: On success, 0 is returned and the segment number of the
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* allocated segment is stored in the place pointed by @segnump. On error, one
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* of the following negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-ENOSPC - No clean segment left.
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*/
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int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
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{
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struct buffer_head *header_bh, *su_bh;
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struct the_nilfs *nilfs;
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struct nilfs_sufile_header *header;
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struct nilfs_segment_usage *su;
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size_t susz = NILFS_MDT(sufile)->mi_entry_size;
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__u64 segnum, maxsegnum, last_alloc;
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void *kaddr;
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unsigned long nsegments, ncleansegs, nsus;
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int ret, i, j;
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down_write(&NILFS_MDT(sufile)->mi_sem);
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nilfs = NILFS_MDT(sufile)->mi_nilfs;
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ret = nilfs_sufile_get_header_block(sufile, &header_bh);
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if (ret < 0)
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goto out_sem;
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kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
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header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
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ncleansegs = le64_to_cpu(header->sh_ncleansegs);
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last_alloc = le64_to_cpu(header->sh_last_alloc);
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kunmap_atomic(kaddr, KM_USER0);
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nsegments = nilfs_sufile_get_nsegments(sufile);
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segnum = last_alloc + 1;
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maxsegnum = nsegments - 1;
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for (i = 0; i < nsegments; i += nsus) {
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if (segnum >= nsegments) {
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/* wrap around */
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segnum = 0;
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maxsegnum = last_alloc;
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}
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ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1,
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&su_bh);
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if (ret < 0)
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goto out_header;
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kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
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su = nilfs_sufile_block_get_segment_usage(
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sufile, segnum, su_bh, kaddr);
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nsus = nilfs_sufile_segment_usages_in_block(
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sufile, segnum, maxsegnum);
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for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) {
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if (!nilfs_segment_usage_clean(su))
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continue;
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/* found a clean segment */
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nilfs_segment_usage_set_active(su);
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nilfs_segment_usage_set_dirty(su);
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kunmap_atomic(kaddr, KM_USER0);
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kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
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header = nilfs_sufile_block_get_header(
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sufile, header_bh, kaddr);
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le64_add_cpu(&header->sh_ncleansegs, -1);
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le64_add_cpu(&header->sh_ndirtysegs, 1);
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header->sh_last_alloc = cpu_to_le64(segnum);
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kunmap_atomic(kaddr, KM_USER0);
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nilfs_mdt_mark_buffer_dirty(header_bh);
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nilfs_mdt_mark_buffer_dirty(su_bh);
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nilfs_mdt_mark_dirty(sufile);
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brelse(su_bh);
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*segnump = segnum;
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goto out_header;
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}
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kunmap_atomic(kaddr, KM_USER0);
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brelse(su_bh);
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}
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/* no segments left */
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ret = -ENOSPC;
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out_header:
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brelse(header_bh);
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out_sem:
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up_write(&NILFS_MDT(sufile)->mi_sem);
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return ret;
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}
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/**
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* nilfs_sufile_cancel_free -
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* @sufile: inode of segment usage file
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* @segnum: segment number
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*
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* Description:
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*
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* Return Value: On success, 0 is returned. On error, one of the following
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* negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*/
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int nilfs_sufile_cancel_free(struct inode *sufile, __u64 segnum)
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{
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struct buffer_head *header_bh, *su_bh;
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struct the_nilfs *nilfs;
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struct nilfs_sufile_header *header;
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struct nilfs_segment_usage *su;
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void *kaddr;
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int ret;
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down_write(&NILFS_MDT(sufile)->mi_sem);
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nilfs = NILFS_MDT(sufile)->mi_nilfs;
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ret = nilfs_sufile_get_header_block(sufile, &header_bh);
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if (ret < 0)
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goto out_sem;
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ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &su_bh);
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if (ret < 0)
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goto out_header;
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kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
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su = nilfs_sufile_block_get_segment_usage(
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sufile, segnum, su_bh, kaddr);
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if (!nilfs_segment_usage_clean(su)) {
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printk(KERN_CRIT "%s: segment %llu must be clean\n",
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__func__, (unsigned long long)segnum);
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BUG();
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}
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nilfs_segment_usage_set_dirty(su);
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kunmap_atomic(kaddr, KM_USER0);
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kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
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header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
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le64_add_cpu(&header->sh_ncleansegs, -1);
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le64_add_cpu(&header->sh_ndirtysegs, 1);
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kunmap_atomic(kaddr, KM_USER0);
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nilfs_mdt_mark_buffer_dirty(header_bh);
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nilfs_mdt_mark_buffer_dirty(su_bh);
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nilfs_mdt_mark_dirty(sufile);
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brelse(su_bh);
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out_header:
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brelse(header_bh);
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out_sem:
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up_write(&NILFS_MDT(sufile)->mi_sem);
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return ret;
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}
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/**
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* nilfs_sufile_freev - free segments
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* @sufile: inode of segment usage file
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* @segnum: array of segment numbers
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* @nsegs: number of segments
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*
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* Description: nilfs_sufile_freev() frees segments specified by @segnum and
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* @nsegs, which must have been returned by a previous call to
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* nilfs_sufile_alloc().
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*
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* Return Value: On success, 0 is returned. On error, one of the following
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* negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*/
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#define NILFS_SUFILE_FREEV_PREALLOC 16
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int nilfs_sufile_freev(struct inode *sufile, __u64 *segnum, size_t nsegs)
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{
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struct buffer_head *header_bh, **su_bh,
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*su_bh_prealloc[NILFS_SUFILE_FREEV_PREALLOC];
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struct the_nilfs *nilfs;
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struct nilfs_sufile_header *header;
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struct nilfs_segment_usage *su;
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void *kaddr;
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int ret, i;
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down_write(&NILFS_MDT(sufile)->mi_sem);
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nilfs = NILFS_MDT(sufile)->mi_nilfs;
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/* prepare resources */
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if (nsegs <= NILFS_SUFILE_FREEV_PREALLOC)
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su_bh = su_bh_prealloc;
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else {
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su_bh = kmalloc(sizeof(*su_bh) * nsegs, GFP_NOFS);
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if (su_bh == NULL) {
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ret = -ENOMEM;
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goto out_sem;
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}
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}
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ret = nilfs_sufile_get_header_block(sufile, &header_bh);
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if (ret < 0)
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goto out_su_bh;
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for (i = 0; i < nsegs; i++) {
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ret = nilfs_sufile_get_segment_usage_block(sufile, segnum[i],
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0, &su_bh[i]);
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if (ret < 0)
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goto out_bh;
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}
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/* free segments */
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for (i = 0; i < nsegs; i++) {
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kaddr = kmap_atomic(su_bh[i]->b_page, KM_USER0);
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su = nilfs_sufile_block_get_segment_usage(
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sufile, segnum[i], su_bh[i], kaddr);
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BUG_ON(nilfs_segment_usage_error(su));
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nilfs_segment_usage_set_clean(su);
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kunmap_atomic(kaddr, KM_USER0);
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nilfs_mdt_mark_buffer_dirty(su_bh[i]);
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}
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kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
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header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
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le64_add_cpu(&header->sh_ncleansegs, nsegs);
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le64_add_cpu(&header->sh_ndirtysegs, -(u64)nsegs);
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kunmap_atomic(kaddr, KM_USER0);
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nilfs_mdt_mark_buffer_dirty(header_bh);
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nilfs_mdt_mark_dirty(sufile);
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out_bh:
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for (i--; i >= 0; i--)
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brelse(su_bh[i]);
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brelse(header_bh);
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out_su_bh:
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if (su_bh != su_bh_prealloc)
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kfree(su_bh);
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out_sem:
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up_write(&NILFS_MDT(sufile)->mi_sem);
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return ret;
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}
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|
/**
|
||
|
|
* nilfs_sufile_free -
|
||
|
|
* @sufile:
|
||
|
|
* @segnum:
|
||
|
|
*/
|
||
|
|
int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
|
||
|
|
{
|
||
|
|
return nilfs_sufile_freev(sufile, &segnum, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* nilfs_sufile_get_segment_usage - get a segment usage
|
||
|
|
* @sufile: inode of segment usage file
|
||
|
|
* @segnum: segment number
|
||
|
|
* @sup: pointer to segment usage
|
||
|
|
* @bhp: pointer to buffer head
|
||
|
|
*
|
||
|
|
* Description: nilfs_sufile_get_segment_usage() acquires the segment usage
|
||
|
|
* specified by @segnum.
|
||
|
|
*
|
||
|
|
* Return Value: On success, 0 is returned, and the segment usage and the
|
||
|
|
* buffer head of the buffer on which the segment usage is located are stored
|
||
|
|
* in the place pointed by @sup and @bhp, respectively. On error, one of the
|
||
|
|
* following negative error codes is returned.
|
||
|
|
*
|
||
|
|
* %-EIO - I/O error.
|
||
|
|
*
|
||
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
||
|
|
*
|
||
|
|
* %-EINVAL - Invalid segment usage number.
|
||
|
|
*/
|
||
|
|
int nilfs_sufile_get_segment_usage(struct inode *sufile, __u64 segnum,
|
||
|
|
struct nilfs_segment_usage **sup,
|
||
|
|
struct buffer_head **bhp)
|
||
|
|
{
|
||
|
|
struct buffer_head *bh;
|
||
|
|
struct nilfs_segment_usage *su;
|
||
|
|
void *kaddr;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
/* segnum is 0 origin */
|
||
|
|
BUG_ON(segnum >= nilfs_sufile_get_nsegments(sufile));
|
||
|
|
|
||
|
|
down_write(&NILFS_MDT(sufile)->mi_sem);
|
||
|
|
ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, &bh);
|
||
|
|
if (ret < 0)
|
||
|
|
goto out_sem;
|
||
|
|
kaddr = kmap(bh->b_page);
|
||
|
|
su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
|
||
|
|
if (nilfs_segment_usage_error(su)) {
|
||
|
|
kunmap(bh->b_page);
|
||
|
|
brelse(bh);
|
||
|
|
ret = -EINVAL;
|
||
|
|
goto out_sem;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (sup != NULL)
|
||
|
|
*sup = su;
|
||
|
|
*bhp = bh;
|
||
|
|
|
||
|
|
out_sem:
|
||
|
|
up_write(&NILFS_MDT(sufile)->mi_sem);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* nilfs_sufile_put_segment_usage - put a segment usage
|
||
|
|
* @sufile: inode of segment usage file
|
||
|
|
* @segnum: segment number
|
||
|
|
* @bh: buffer head
|
||
|
|
*
|
||
|
|
* Description: nilfs_sufile_put_segment_usage() releases the segment usage
|
||
|
|
* specified by @segnum. @bh must be the buffer head which have been returned
|
||
|
|
* by a previous call to nilfs_sufile_get_segment_usage() with @segnum.
|
||
|
|
*/
|
||
|
|
void nilfs_sufile_put_segment_usage(struct inode *sufile, __u64 segnum,
|
||
|
|
struct buffer_head *bh)
|
||
|
|
{
|
||
|
|
kunmap(bh->b_page);
|
||
|
|
brelse(bh);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* nilfs_sufile_get_stat - get segment usage statistics
|
||
|
|
* @sufile: inode of segment usage file
|
||
|
|
* @stat: pointer to a structure of segment usage statistics
|
||
|
|
*
|
||
|
|
* Description: nilfs_sufile_get_stat() returns information about segment
|
||
|
|
* usage.
|
||
|
|
*
|
||
|
|
* Return Value: On success, 0 is returned, and segment usage information is
|
||
|
|
* stored in the place pointed by @stat. On error, one of the following
|
||
|
|
* negative error codes is returned.
|
||
|
|
*
|
||
|
|
* %-EIO - I/O error.
|
||
|
|
*
|
||
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
||
|
|
*/
|
||
|
|
int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
|
||
|
|
{
|
||
|
|
struct buffer_head *header_bh;
|
||
|
|
struct nilfs_sufile_header *header;
|
||
|
|
void *kaddr;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
down_read(&NILFS_MDT(sufile)->mi_sem);
|
||
|
|
|
||
|
|
ret = nilfs_sufile_get_header_block(sufile, &header_bh);
|
||
|
|
if (ret < 0)
|
||
|
|
goto out_sem;
|
||
|
|
|
||
|
|
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
|
||
|
|
header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
|
||
|
|
sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile);
|
||
|
|
sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs);
|
||
|
|
sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs);
|
||
|
|
sustat->ss_ctime = NILFS_MDT(sufile)->mi_nilfs->ns_ctime;
|
||
|
|
sustat->ss_nongc_ctime = NILFS_MDT(sufile)->mi_nilfs->ns_nongc_ctime;
|
||
|
|
kunmap_atomic(kaddr, KM_USER0);
|
||
|
|
brelse(header_bh);
|
||
|
|
|
||
|
|
out_sem:
|
||
|
|
up_read(&NILFS_MDT(sufile)->mi_sem);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* nilfs_sufile_get_ncleansegs - get the number of clean segments
|
||
|
|
* @sufile: inode of segment usage file
|
||
|
|
* @nsegsp: pointer to the number of clean segments
|
||
|
|
*
|
||
|
|
* Description: nilfs_sufile_get_ncleansegs() acquires the number of clean
|
||
|
|
* segments.
|
||
|
|
*
|
||
|
|
* Return Value: On success, 0 is returned and the number of clean segments is
|
||
|
|
* stored in the place pointed by @nsegsp. On error, one of the following
|
||
|
|
* negative error codes is returned.
|
||
|
|
*
|
||
|
|
* %-EIO - I/O error.
|
||
|
|
*
|
||
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
||
|
|
*/
|
||
|
|
int nilfs_sufile_get_ncleansegs(struct inode *sufile, unsigned long *nsegsp)
|
||
|
|
{
|
||
|
|
struct nilfs_sustat sustat;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = nilfs_sufile_get_stat(sufile, &sustat);
|
||
|
|
if (ret == 0)
|
||
|
|
*nsegsp = sustat.ss_ncleansegs;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* nilfs_sufile_set_error - mark a segment as erroneous
|
||
|
|
* @sufile: inode of segment usage file
|
||
|
|
* @segnum: segment number
|
||
|
|
*
|
||
|
|
* Description: nilfs_sufile_set_error() marks the segment specified by
|
||
|
|
* @segnum as erroneous. The error segment will never be used again.
|
||
|
|
*
|
||
|
|
* Return Value: On success, 0 is returned. On error, one of the following
|
||
|
|
* negative error codes is returned.
|
||
|
|
*
|
||
|
|
* %-EIO - I/O error.
|
||
|
|
*
|
||
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
||
|
|
*/
|
||
|
|
int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
|
||
|
|
{
|
||
|
|
struct buffer_head *header_bh, *su_bh;
|
||
|
|
struct nilfs_segment_usage *su;
|
||
|
|
struct nilfs_sufile_header *header;
|
||
|
|
void *kaddr;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
BUG_ON(segnum >= nilfs_sufile_get_nsegments(sufile));
|
||
|
|
|
||
|
|
down_write(&NILFS_MDT(sufile)->mi_sem);
|
||
|
|
|
||
|
|
ret = nilfs_sufile_get_header_block(sufile, &header_bh);
|
||
|
|
if (ret < 0)
|
||
|
|
goto out_sem;
|
||
|
|
ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &su_bh);
|
||
|
|
if (ret < 0)
|
||
|
|
goto out_header;
|
||
|
|
|
||
|
|
kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
|
||
|
|
su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
|
||
|
|
if (nilfs_segment_usage_error(su)) {
|
||
|
|
kunmap_atomic(kaddr, KM_USER0);
|
||
|
|
brelse(su_bh);
|
||
|
|
goto out_header;
|
||
|
|
}
|
||
|
|
|
||
|
|
nilfs_segment_usage_set_error(su);
|
||
|
|
kunmap_atomic(kaddr, KM_USER0);
|
||
|
|
brelse(su_bh);
|
||
|
|
|
||
|
|
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
|
||
|
|
header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
|
||
|
|
le64_add_cpu(&header->sh_ndirtysegs, -1);
|
||
|
|
kunmap_atomic(kaddr, KM_USER0);
|
||
|
|
nilfs_mdt_mark_buffer_dirty(header_bh);
|
||
|
|
nilfs_mdt_mark_buffer_dirty(su_bh);
|
||
|
|
nilfs_mdt_mark_dirty(sufile);
|
||
|
|
brelse(su_bh);
|
||
|
|
|
||
|
|
out_header:
|
||
|
|
brelse(header_bh);
|
||
|
|
|
||
|
|
out_sem:
|
||
|
|
up_write(&NILFS_MDT(sufile)->mi_sem);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* nilfs_sufile_get_suinfo -
|
||
|
|
* @sufile: inode of segment usage file
|
||
|
|
* @segnum: segment number to start looking
|
||
|
|
* @si: array of suinfo
|
||
|
|
* @nsi: size of suinfo array
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
*
|
||
|
|
* Return Value: On success, 0 is returned and .... On error, one of the
|
||
|
|
* following negative error codes is returned.
|
||
|
|
*
|
||
|
|
* %-EIO - I/O error.
|
||
|
|
*
|
||
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
||
|
|
*/
|
||
|
|
ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum,
|
||
|
|
struct nilfs_suinfo *si, size_t nsi)
|
||
|
|
{
|
||
|
|
struct buffer_head *su_bh;
|
||
|
|
struct nilfs_segment_usage *su;
|
||
|
|
size_t susz = NILFS_MDT(sufile)->mi_entry_size;
|
||
|
|
void *kaddr;
|
||
|
|
unsigned long nsegs, segusages_per_block;
|
||
|
|
ssize_t n;
|
||
|
|
int ret, i, j;
|
||
|
|
|
||
|
|
down_read(&NILFS_MDT(sufile)->mi_sem);
|
||
|
|
|
||
|
|
segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
|
||
|
|
nsegs = min_t(unsigned long,
|
||
|
|
nilfs_sufile_get_nsegments(sufile) - segnum,
|
||
|
|
nsi);
|
||
|
|
for (i = 0; i < nsegs; i += n, segnum += n) {
|
||
|
|
n = min_t(unsigned long,
|
||
|
|
segusages_per_block -
|
||
|
|
nilfs_sufile_get_offset(sufile, segnum),
|
||
|
|
nsegs - i);
|
||
|
|
ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
|
||
|
|
&su_bh);
|
||
|
|
if (ret < 0) {
|
||
|
|
if (ret != -ENOENT)
|
||
|
|
goto out;
|
||
|
|
/* hole */
|
||
|
|
memset(&si[i], 0, sizeof(struct nilfs_suinfo) * n);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
|
||
|
|
su = nilfs_sufile_block_get_segment_usage(
|
||
|
|
sufile, segnum, su_bh, kaddr);
|
||
|
|
for (j = 0; j < n; j++, su = (void *)su + susz) {
|
||
|
|
si[i + j].sui_lastmod = le64_to_cpu(su->su_lastmod);
|
||
|
|
si[i + j].sui_nblocks = le32_to_cpu(su->su_nblocks);
|
||
|
|
si[i + j].sui_flags = le32_to_cpu(su->su_flags);
|
||
|
|
}
|
||
|
|
kunmap_atomic(kaddr, KM_USER0);
|
||
|
|
brelse(su_bh);
|
||
|
|
}
|
||
|
|
ret = nsegs;
|
||
|
|
|
||
|
|
out:
|
||
|
|
up_read(&NILFS_MDT(sufile)->mi_sem);
|
||
|
|
return ret;
|
||
|
|
}
|