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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>
This commit is contained in:
Russ W. Knize 2013-09-24 09:35:40 -05:00 committed by Jaegeuk Kim
parent 691c6fd2a2
commit 885166c03c
1 changed files with 2 additions and 0 deletions
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2
fs/f2fs/checkpoint.c
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@ -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;
}