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locks: add new struct list_head to struct file_lock

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...that we can use to queue file_locks to per-ctx list_heads. Go ahead
and convert locks_delete_lock and locks_dispose_list to use it instead
of the fl_block list.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Acked-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jeff Layton 2015-01-16 15:05:54 -05:00
parent cb59670870
commit 6dee60f69d
2 changed files with 6 additions and 3 deletions
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8
fs/locks.c
View File

@ -207,6 +207,7 @@ static struct kmem_cache *filelock_cache __read_mostly;
static void locks_init_lock_heads(struct file_lock *fl)
{
INIT_HLIST_NODE(&fl->fl_link);
INIT_LIST_HEAD(&fl->fl_list);
INIT_LIST_HEAD(&fl->fl_block);
init_waitqueue_head(&fl->fl_wait);
}
@ -243,6 +244,7 @@ EXPORT_SYMBOL_GPL(locks_release_private);
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_block));
BUG_ON(!hlist_unhashed(&fl->fl_link));
@ -257,8 +259,8 @@ locks_dispose_list(struct list_head *dispose)
struct file_lock *fl;
while (!list_empty(dispose)) {
fl = list_first_entry(dispose, struct file_lock, fl_block);
list_del_init(&fl->fl_block);
fl = list_first_entry(dispose, struct file_lock, fl_list);
list_del_init(&fl->fl_list);
locks_free_lock(fl);
}
}
@ -691,7 +693,7 @@ static void locks_delete_lock(struct file_lock **thisfl_p,
locks_unlink_lock(thisfl_p);
if (dispose)
list_add(&fl->fl_block, dispose);
list_add(&fl->fl_list, dispose);
else
locks_free_lock(fl);
}

1
include/linux/fs.h
View File

@ -934,6 +934,7 @@ int locks_in_grace(struct net *);
*/
struct file_lock {
struct file_lock *fl_next; /* singly linked list for this inode */
struct list_head fl_list; /* link into file_lock_context */
struct hlist_node fl_link; /* node in global lists */
struct list_head fl_block; /* circular list of blocked processes */
fl_owner_t fl_owner;