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authorNeilBrown <neilb@suse.com>2019-04-24 04:00:08 +0200
committerJ. Bruce Fields <bfields@redhat.com>2019-04-24 15:51:48 +0200
commit5926459e7c897ee348c134f44da520c8bf234b05 (patch)
treed2134d1e9433de3caeac5dcf636c32580ae26c8d /fs/locks.c
parentnfsd: fh_drop_write in nfsd_unlink (diff)
downloadlinux-5926459e7c897ee348c134f44da520c8bf234b05.tar.xz
linux-5926459e7c897ee348c134f44da520c8bf234b05.zip
locks: move checks from locks_free_lock() to locks_release_private()
Code that allocates locks using locks_alloc_lock() will free it using locks_free_lock(), and will benefit from the BUG_ON() consistency checks therein. However some code (nfsd and lockd) allocate a lock embedded in some other data structure, and so free the lock themselves after calling locks_release_private(). This path does not benefit from the consistency checks. To help catch future errors, move the BUG_ON() checks to locks_release_private() - which locks_free_lock() already calls. This ensures that all users for locks will find out if the lock isn't detached properly before being free. Signed-off-by: NeilBrown <neilb@suse.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 71d0c6c2aac5..456a3782c6ca 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -352,6 +352,12 @@ EXPORT_SYMBOL_GPL(locks_alloc_lock);
void locks_release_private(struct file_lock *fl)
{
+ BUG_ON(waitqueue_active(&fl->fl_wait));
+ BUG_ON(!list_empty(&fl->fl_list));
+ BUG_ON(!list_empty(&fl->fl_blocked_requests));
+ BUG_ON(!list_empty(&fl->fl_blocked_member));
+ BUG_ON(!hlist_unhashed(&fl->fl_link));
+
if (fl->fl_ops) {
if (fl->fl_ops->fl_release_private)
fl->fl_ops->fl_release_private(fl);
@@ -371,12 +377,6 @@ EXPORT_SYMBOL_GPL(locks_release_private);
/* Free a lock which is not in use. */
void locks_free_lock(struct file_lock *fl)
{
- BUG_ON(waitqueue_active(&fl->fl_wait));
- BUG_ON(!list_empty(&fl->fl_list));
- BUG_ON(!list_empty(&fl->fl_blocked_requests));
- BUG_ON(!list_empty(&fl->fl_blocked_member));
- BUG_ON(!hlist_unhashed(&fl->fl_link));
-
locks_release_private(fl);
kmem_cache_free(filelock_cache, fl);
}