diff options
| author |   Kinglong Mee <kinglongmee@gmail.com> | 2015-11-04 15:20:15 +0000 |
|---|---|---|
| committer |   Al Viro <viro@zeniv.linux.org.uk> | 2015-11-11 02:06:53 -0500 |
| commit | 86108c2e34a26e4bec3c6ddb23390bf8cedcf391 (patch) | |
| tree | 6c9dc0e43e804fa041a2e0d5c20e70678d3f898d | |
| parent | debugfs: fix refcount imbalance in start_creating (diff) | |
| download | linux-dev-86108c2e34a26e4bec3c6ddb23390bf8cedcf391.tar.xz linux-dev-86108c2e34a26e4bec3c6ddb23390bf8cedcf391.zip | |
FS-Cache: Increase reference of parent after registering, netfs success
If netfs exist, fscache should not increase the reference of parent's
usage and n_children, otherwise, never be decreased.
v2: thanks David's suggest,
move increasing reference of parent if success
use kmem_cache_free() freeing primary_index directly
v3: don't move "netfs->primary_index->parent = &fscache_fsdef_index;"
Cc: stable@vger.kernel.org # v2.6.30+
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/fscache/netfs.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/fscache/netfs.c b/fs/fscache/netfs.c index 6d941f56faf4..458cc968d9a0 100644 --- a/fs/fscache/netfs.c +++ b/fs/fscache/netfs.c @@ -47,9 +47,6 @@ int __fscache_register_netfs(struct fscache_netfs *netfs) netfs->primary_index->netfs_data = netfs; netfs->primary_index->flags = 1 << FSCACHE_COOKIE_ENABLED; - atomic_inc(&netfs->primary_index->parent->usage); - atomic_inc(&netfs->primary_index->parent->n_children); - spin_lock_init(&netfs->primary_index->lock); INIT_HLIST_HEAD(&netfs->primary_index->backing_objects); @@ -62,6 +59,9 @@ int __fscache_register_netfs(struct fscache_netfs *netfs) goto already_registered; } + atomic_inc(&netfs->primary_index->parent->usage); + atomic_inc(&netfs->primary_index->parent->n_children); + list_add(&netfs->link, &fscache_netfs_list); ret = 0; @@ -71,8 +71,7 @@ already_registered: up_write(&fscache_addremove_sem); if (ret < 0) { - netfs->primary_index->parent = NULL; - __fscache_cookie_put(netfs->primary_index); + kmem_cache_free(fscache_cookie_jar, netfs->primary_index); netfs->primary_index = NULL; } |