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nilfs2: fix possible mismatch of sufile counters on recovery

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On-disk counters ndirtysegs and ncleansegs of sufile, can go wrong
after roll-forward recovery because
nilfs_prepare_segment_for_recovery() function marks segments dirty
without adjusting value of these counters.

This fixes the problem by adding a function to sufile which does the
operation adjusting the counters, and by letting the recovery function
use it.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2009-04-05 18:30:58 +09:00
parent a703018f7b
commit c85399c2da
3 changed files with 45 additions and 16 deletions
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20
fs/nilfs2/recovery.c
View File

@ -413,7 +413,6 @@ static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
struct nilfs_segment_entry *ent, *n;
struct inode *sufile = nilfs->ns_sufile;
__u64 segnum[4];
time_t mtime;
int err;
int i;
@ -442,24 +441,13 @@ static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
* Collecting segments written after the latest super root.
* These are marked dirty to avoid being reallocated in the next write.
*/
mtime = get_seconds();
list_for_each_entry_safe(ent, n, head, list) {
if (ent->segnum == segnum[0]) {
list_del(&ent->list);
nilfs_free_segment_entry(ent);
continue;
}
err = nilfs_open_segment_entry(ent, sufile);
if (unlikely(err))
goto failed;
if (!nilfs_segment_usage_dirty(ent->raw_su)) {
/* make the segment garbage */
ent->raw_su->su_nblocks = cpu_to_le32(0);
ent->raw_su->su_lastmod = cpu_to_le32(mtime);
nilfs_segment_usage_set_dirty(ent->raw_su);
if (ent->segnum != segnum[0]) {
err = nilfs_sufile_scrap(sufile, ent->segnum);
if (unlikely(err))
goto failed;
}
list_del(&ent->list);
nilfs_close_segment_entry(ent, sufile);
nilfs_free_segment_entry(ent);
}

29
fs/nilfs2/sufile.c
View File

@ -258,6 +258,35 @@ void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
nilfs_mdt_mark_dirty(sufile);
}
void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
struct buffer_head *header_bh,
struct buffer_head *su_bh)
{
struct nilfs_segment_usage *su;
void *kaddr;
int clean, dirty;
kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
if (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) &&
su->su_nblocks == cpu_to_le32(0)) {
kunmap_atomic(kaddr, KM_USER0);
return;
}
clean = nilfs_segment_usage_clean(su);
dirty = nilfs_segment_usage_dirty(su);
/* make the segment garbage */
su->su_lastmod = cpu_to_le64(0);
su->su_nblocks = cpu_to_le32(0);
su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY);
kunmap_atomic(kaddr, KM_USER0);
nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
}
void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
struct buffer_head *header_bh,
struct buffer_head *su_bh)

12
fs/nilfs2/sufile.h
View File

@ -52,6 +52,8 @@ int nilfs_sufile_update(struct inode *, __u64, int,
struct buffer_head *));
void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
struct buffer_head *);
void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
struct buffer_head *);
void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
struct buffer_head *);
void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
@ -77,6 +79,16 @@ static inline int nilfs_sufile_cancel_free(struct inode *sufile, __u64 segnum)
nilfs_sufile_do_cancel_free);
}
/**
* nilfs_sufile_scrap - make a segment garbage
* @sufile: inode of segment usage file
* @segnum: segment number to be freed
*/
static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
{
return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
}
/**
* nilfs_sufile_free - free segment
* @sufile: inode of segment usage file