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>
diff --git a/fs/fscache/netfs.c b/fs/fscache/netfs.c
index 6d941f5..458cc96 100644
--- a/fs/fscache/netfs.c
+++ b/fs/fscache/netfs.c
@@ -47,9 +47,6 @@
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 @@
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 @@
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;
}
