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FS-Cache: Reduce cookie ref count if submit fails.

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I've been seeing issues with disposing cookies under vma pressure. The symptom
is that the refcount gets out of sync. In this case we fail to decrement the
refcount if submit fails. I found this while auditing the error in and around
cookie operations.

Signed-off-by: Milosz Tanski <milosz@adfin.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Milosz Tanski 2014-08-13 12:58:21 -04:00 committed by David Howells
parent 9776de96e5
commit 920bce20d7
1 changed files with 1 additions and 0 deletions
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fs/fscache/object.c
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@ -982,6 +982,7 @@ static const struct fscache_state *_fscache_invalidate_object(struct fscache_obj
submit_op_failed:
clear_bit(FSCACHE_OBJECT_IS_LIVE, &object->flags);
spin_unlock(&cookie->lock);
fscache_unuse_cookie(object);
kfree(op);
_leave(" [EIO]");
return transit_to(KILL_OBJECT);