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| author | Kinglong Mee <kinglongmee@gmail.com> | 2015-11-04 15:20:15 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-19 14:22:41 -0800 |
| commit | 669e0b00cba824568ebe800ee34c14254b917654 (patch) | |
| tree | e6cf5b071274a13ec49a3fb2f73b9c5bc91e827a | |
| parent | 471b81310d2198d0a9dfeddfffdac036b9c9cee7 (diff) | |
| download | linux-stable-669e0b00cba824568ebe800ee34c14254b917654.tar.gz linux-stable-669e0b00cba824568ebe800ee34c14254b917654.tar.bz2 linux-stable-669e0b00cba824568ebe800ee34c14254b917654.zip | |
FS-Cache: Increase reference of parent after registering, netfs success
commit 86108c2e34a26e4bec3c6ddb23390bf8cedcf391 upstream.
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;"
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 e028b8eb1c40..0912b90e05bc 100644 --- a/fs/fscache/netfs.c +++ b/fs/fscache/netfs.c @@ -45,9 +45,6 @@ int __fscache_register_netfs(struct fscache_netfs *netfs) netfs->primary_index->parent = &fscache_fsdef_index; netfs->primary_index->netfs_data = netfs; - 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); @@ -60,6 +57,9 @@ 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; @@ -70,8 +70,7 @@ 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; } |