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| author | Russ W. Knize <russ@knizefamily.net> | 2013-09-24 09:35:40 -0500 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-09-25 17:49:12 +0900 |
| commit | 885166c03c1d0ea6d79d707229340e3161ed1316 (patch) | |
| tree | cd7619af62a9b5420e84fbfe4077a6b1395dfbaf /fs/f2fs/checkpoint.c | |
| parent | 691c6fd2a2d6b6db08b17beec5e42ab0687058c7 (diff) | |
| download | linux-885166c03c1d0ea6d79d707229340e3161ed1316.tar.gz linux-885166c03c1d0ea6d79d707229340e3161ed1316.tar.bz2 linux-885166c03c1d0ea6d79d707229340e3161ed1316.zip | |
f2fs: don't let the orphan inode counter underflow
Accounting errors from buggy code calling the acquire/release/remove
orphan inode interfaces can cause n_orphans to underflow, which will
then cause acquire_orphan_inode() to return -ENOSPC on the next
operation. This commit guards against that condition.
Signed-off-by: Russ Knize <rknize@motorola.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/checkpoint.c')
| -rw-r--r-- | fs/f2fs/checkpoint.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index bb312201ca95..ca3944240db5 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -206,6 +206,7 @@ int acquire_orphan_inode(struct f2fs_sb_info *sbi) void release_orphan_inode(struct f2fs_sb_info *sbi) { mutex_lock(&sbi->orphan_inode_mutex); + BUG_ON(sbi->n_orphans == 0); sbi->n_orphans--; mutex_unlock(&sbi->orphan_inode_mutex); } @@ -253,6 +254,7 @@ void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) if (orphan->ino == ino) { list_del(&orphan->list); kmem_cache_free(orphan_entry_slab, orphan); + BUG_ON(sbi->n_orphans == 0); sbi->n_orphans--; break; } |