diff options
| author | Kinglong Mee <kinglongmee@gmail.com> | 2015-11-04 15:20:24 +0000 |
|---|---|---|
| committer | Zefan Li <lizefan@huawei.com> | 2016-10-26 23:15:24 +0800 |
| commit | 63698e052d6b5c03152644d7d7c80f2df00100dd (patch) | |
| tree | ad895f0d3c174e06ef53831f8fb709c57f12eb12 /fs | |
| parent | 6100bd0a32642e6479c14a26da9e003da8641c0b (diff) | |
FS-Cache: Don't override netfs's primary_index if registering failed
commit b130ed5998e62879a66bad08931a2b5e832da95c upstream.
Only override netfs->primary_index when registering success.
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>
[lizf: Backported to 3.4: there are no n_active and flags in primary_index]
Signed-off-by: Zefan Li <lizefan@huawei.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/fscache/netfs.c | 31 |
1 files changed, 15 insertions, 16 deletions
diff --git a/fs/fscache/netfs.c b/fs/fscache/netfs.c index 0912b90e05bc..6f4e4ed0c8e3 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); @@ -29,24 +30,23 @@ 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(&cookie->usage, 1); + atomic_set(&cookie->n_children, 0); - 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); @@ -57,9 +57,10 @@ 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; @@ -69,10 +70,8 @@ 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; |