From 8f9941aeccc318f243ab3fa55aaa17f4c1cb33f9 Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 19 Feb 2010 18:14:21 +0000 Subject: CacheFiles: Fix a race in cachefiles_delete_object() vs rename cachefiles_delete_object() can race with rename. It gets the parent directory of the object it's asked to delete, then locks it - but rename may have changed the object's parent between the get and the completion of the lock. However, if such a circumstance is detected, we abandon our attempt to delete the object - since it's no longer in the index key path, it won't be seen again by lookups of that key. The assumption is that cachefilesd may have culled it by renaming it to the graveyard for later destruction. Signed-off-by: David Howells Signed-off-by: Al Viro --- fs/cachefiles/namei.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'fs/cachefiles') diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c index 14ac4806e2913..eeb4986ea7db7 100644 --- a/fs/cachefiles/namei.c +++ b/fs/cachefiles/namei.c @@ -348,7 +348,17 @@ int cachefiles_delete_object(struct cachefiles_cache *cache, dir = dget_parent(object->dentry); mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); - ret = cachefiles_bury_object(cache, dir, object->dentry); + + /* we need to check that our parent is _still_ our parent - it may have + * been renamed */ + if (dir == object->dentry->d_parent) { + ret = cachefiles_bury_object(cache, dir, object->dentry); + } else { + /* it got moved, presumably by cachefilesd culling it, so it's + * no longer in the key path and we can ignore it */ + mutex_unlock(&dir->d_inode->i_mutex); + ret = 0; + } dput(dir); _leave(" = %d", ret); -- cgit v1.2.3