linux-kernel - [PATCH 4/7] affs: re-structure superblock locking a bit

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Message-Id: <1338895695-10362-5-git-send-email-dedekind1@gmail.com>
Date:	Tue,  5 Jun 2012 14:28:12 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linux FS Maling List <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Maling List <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/7] affs: re-structure superblock locking a bit

From: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>

AFFS wants to serialize the superblock (the root block in AFFS terms) updates
and uses 'lock_super()/unlock_super()' for these purposes. This patch pushes the
locking down to the 'affs_commit_super()' from the callers.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
---
 fs/affs/super.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/affs/super.c b/fs/affs/super.c
index 3fc50b1..8293cb9 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -31,12 +31,14 @@ affs_commit_super(struct super_block *sb, int wait)
 	struct buffer_head *bh = sbi->s_root_bh;
 	struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
 
+	lock_super(sb);
 	tail->bm_flag = cpu_to_be32(2);
 	secs_to_datestamp(get_seconds(), &tail->disk_change);
 	affs_fix_checksum(sb, bh);
 	mark_buffer_dirty(bh);
 	if (wait)
 		sync_dirty_buffer(bh);
+	unlock_super(sb);
 }
 
 static void
@@ -55,22 +57,17 @@ affs_put_super(struct super_block *sb)
 static void
 affs_write_super(struct super_block *sb)
 {
-	lock_super(sb);
 	if (!(sb->s_flags & MS_RDONLY))
 		affs_commit_super(sb, 1);
 	sb->s_dirt = 0;
-	unlock_super(sb);
-
 	pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
 }
 
 static int
 affs_sync_fs(struct super_block *sb, int wait)
 {
-	lock_super(sb);
 	affs_commit_super(sb, wait);
 	sb->s_dirt = 0;
-	unlock_super(sb);
 	return 0;
 }
 
-- 
1.7.7.6

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