introduce __sb_writers_{acquired,release}() helpers

Preparation to hide the sb->s_writers internals from xfs and btrfs.
Add 2 trivial define's they can use rather than play with ->s_writers
directly. No changes in btrfs/transaction.o and xfs/xfs_aops.o.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Jan Kara <jack@suse.com>

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index f5021fc..a8ab8f5 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1638,9 +1638,7 @@ static void do_async_commit(struct work_struct *work)
         * Tell lockdep about it.
         */
        if (ac->newtrans->type & __TRANS_FREEZABLE)
-               rwsem_acquire_read(
-                    &ac->root->fs_info->sb->s_writers.lock_map[SB_FREEZE_FS-1],
-                    0, 1, _THIS_IP_);
+               __sb_writers_acquired(ac->root->fs_info->sb, SB_FREEZE_FS);
 
        current->journal_info = ac->newtrans;
 
@@ -1679,9 +1677,7 @@ int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
         * async commit thread will be the one to unlock it.
         */
        if (ac->newtrans->type & __TRANS_FREEZABLE)
-               rwsem_release(
-                       &root->fs_info->sb->s_writers.lock_map[SB_FREEZE_FS-1],
-                       1, _THIS_IP_);
+               __sb_writers_release(root->fs_info->sb, SB_FREEZE_FS);
 
        schedule_work(&ac->work);
 

diff --cc fs/xfs/xfs_aops.c
Simple merge

diff --cc include/linux/fs.h
Simple merge