From: Kinglong Mee <kinglongmee@xxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit b130ed5998e62879a66bad08931a2b5e832da95c upstream.
Only override netfs->primary_index when registering success.
Signed-off-by: Kinglong Mee <kinglongmee@xxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
fs/fscache/netfs.c | 33 ++++++++++++++++-----------------
1 file changed, 16 insertions(+), 17 deletions(-)
diff --git a/fs/fscache/netfs.c b/fs/fscache/netfs.c
index 04e18d28013b..1cc98088001f 100644
--- a/fs/fscache/netfs.c
+++ b/fs/fscache/netfs.c
@@ -22,6 +22,7 @@ static LIST_HEAD(fscache_netfs_list);
int __fscache_register_netfs(struct fscache_netfs *netfs)
{
struct fscache_netfs *ptr;
+ struct fscache_cookie *cookie;
int ret;
_enter("{%s}", netfs->name);
@@ -29,25 +30,24 @@ int __fscache_register_netfs(struct fscache_netfs *netfs)
INIT_LIST_HEAD(&netfs->link);
/* allocate a cookie for the primary index */
- netfs->primary_index =
- kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
+ cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
- if (!netfs->primary_index) {
+ if (!cookie) {
_leave(" = -ENOMEM");
return -ENOMEM;
}
/* initialise the primary index cookie */
- atomic_set(&netfs->primary_index->usage, 1);
- atomic_set(&netfs->primary_index->n_children, 0);
- atomic_set(&netfs->primary_index->n_active, 1);
+ atomic_set(&cookie->usage, 1);
+ atomic_set(&cookie->n_children, 0);
+ atomic_set(&cookie->n_active, 1);
- netfs->primary_index->def = &fscache_fsdef_netfs_def;
- netfs->primary_index->parent = &fscache_fsdef_index;
- netfs->primary_index->netfs_data = netfs;
+ cookie->def = &fscache_fsdef_netfs_def;
+ cookie->parent = &fscache_fsdef_index;
+ cookie->netfs_data = netfs;
- spin_lock_init(&netfs->primary_index->lock);
- INIT_HLIST_HEAD(&netfs->primary_index->backing_objects);
+ spin_lock_init(&cookie->lock);
+ INIT_HLIST_HEAD(&cookie->backing_objects);
/* check the netfs type is not already present */
down_write(&fscache_addremove_sem);
@@ -58,9 +58,10 @@ 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);
+ atomic_inc(&cookie->parent->usage);
+ atomic_inc(&cookie->parent->n_children);
+ netfs->primary_index = cookie;
list_add(&netfs->link, &fscache_netfs_list);
ret = 0;
@@ -70,10 +71,8 @@ int __fscache_register_netfs(struct fscache_netfs *netfs)
already_registered:
up_write(&fscache_addremove_sem);
- if (ret < 0) {
- kmem_cache_free(fscache_cookie_jar, netfs->primary_index);
- netfs->primary_index = NULL;
- }
+ if (ret < 0)
+ kmem_cache_free(fscache_cookie_jar, cookie);
_leave(" = %d", ret);
return ret;
--
2.7.1
--
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