linux-kernel - [PATCH 1/2] VFS: use __put_super_and_need_restart in get_active

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Date:	Wed, 24 Mar 2010 16:12:23 +1100
From:	NeilBrown <neilb@...e.de>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] VFS: use __put_super_and_need_restart in get_active_super.

The recently-added get_active_super() walks the super_blocks
list but unlike all other code that walks this list it does
not use __put_super_and_need_restart().
I believe this is an omission that should be fixed.

cc: Christoph Hellwig <hch@....de>
Signed-off-by: NeilBrown <neilb@...e.de>
---
 fs/super.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/super.c b/fs/super.c
index f35ac60..34c8391 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -482,6 +482,7 @@ struct super_block *get_active_super(struct block_device *bdev)
 		return NULL;

 	spin_lock(&sb_lock);
+restart:
 	list_for_each_entry(sb, &super_blocks, s_list) {
 		if (sb->s_bdev != bdev)
 			continue;
@@ -500,9 +501,10 @@ struct super_block *get_active_super(struct block_device *bdev)
 			spin_unlock(&sb_lock);
 		}
 		up_write(&sb->s_umount);
-		put_super(sb);
 		yield();
 		spin_lock(&sb_lock);
+		if (__put_super_and_need_restart(sb))
+			goto restart;
 	}
 	spin_unlock(&sb_lock);
 	return NULL;

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