From ebc1ac164560a241d9bf1b7519062910c3f90a01 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig
Date: Mon, 11 May 2009 23:35:03 +0200
Subject: ->write_super lock_super pushdown

Push down lock_super into ->write_super instances and remove it from the
caller.

Following filesystem don't need ->s_lock in ->write_super and are skipped:

 * bfs, nilfs2 - no other uses of s_lock and have internal locks in
	->write_super
 * ext2 - uses BKL in ext2_write_super and has internal calls without s_lock
 * reiserfs - no other uses of s_lock as has reiserfs_write_lock (BKL) in
 	->write_super
 * xfs - no other uses of s_lock and uses internal lock (buffer lock on
	superblock buffer) to serialize ->write_super.  Also xfs_fs_write_super
	is superflous and will go away in the next merge window

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/exofs/super.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'fs/exofs')

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index cd1f8b18a218..49e16af4e619 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -214,6 +214,7 @@ static void exofs_write_super(struct super_block *sb)
 		return;
 	}
 
+	lock_super(sb);
 	lock_kernel();
 	sbi = sb->s_fs_info;
 	fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
@@ -246,6 +247,7 @@ out:
 	if (or)
 		osd_end_request(or);
 	unlock_kernel();
+	unlock_super(sb);
 	kfree(fscb);
 }
 
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