[PATCH 3.4 011/125] FS-Cache: Increase reference of parent after registering, netfs success
flat view
STALE3651d
From: lizf@kernel.org
Date: 2016-10-12 12:35:34
Also in:
lkml
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
From: Kinglong Mee <redacted> 3.4.113-rc1 review patch. If anyone has any objections, please let me know. ------------------ 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 <redacted> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Zefan Li <redacted> --- fs/fscache/netfs.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/fs/fscache/netfs.c b/fs/fscache/netfs.c
index e028b8e..0912b90 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; }
--
1.9.1