Commit 4ea591a2 authored by Kinglong Mee's avatar Kinglong Mee Committed by Kamal Mostafa

FS-Cache: Don't override netfs's primary_index if registering failed

commit b130ed59 upstream.

Only override netfs->primary_index when registering success.
Signed-off-by: default avatarKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarKamal Mostafa <kamal@canonical.com>
parent ef7ea66b
......@@ -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);
......@@ -29,26 +30,25 @@ 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;
netfs->primary_index->flags = 1 << FSCACHE_COOKIE_ENABLED;
cookie->def = &fscache_fsdef_netfs_def;
cookie->parent = &fscache_fsdef_index;
cookie->netfs_data = netfs;
cookie->flags = 1 << FSCACHE_COOKIE_ENABLED;
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);
......@@ -59,9 +59,10 @@ 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;
......@@ -71,10 +72,8 @@ 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;
......
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