| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.3 188/200] FS-Cache: Increase reference of parent after registering, netfs success | Date | Sun, 14 Feb 2016 14:23:15 -0800 |
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4.3-stable review patch. If anyone has any objections, please let me know.
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From: Kinglong Mee <kinglongmee@gmail.com>
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 <kinglongmee@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/fscache/netfs.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)
--- a/fs/fscache/netfs.c +++ b/fs/fscache/netfs.c @@ -47,9 +47,6 @@ int __fscache_register_netfs(struct fsca 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 @@ int __fscache_register_netfs(struct fsca 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 @@ 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; }
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