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Date:	Thu, 26 Apr 2012 10:58:11 +0800
From:	Miao Xie <miaoxie1984@...il.com>
To:	Theodore Ts'o <tytso@....edu>
CC:	Linux Ext4 <linux-ext4@...r.kernel.org>, miaox@...fujitsu.com,
	Linux FSDevel <linux-fsdevel@...r.kernel.org>
Subject: [PATCH 3/4] Ext4: use try_to_writeback_inodes_sb() instead of writeback_inodes_sb_if_idle()

If the s_umount is write locked, then the sb is not idle. IOWs,
writeback_inodes_sb...if_idle() should be doing down_read_trylock(),
not down_read(). So use try_to_writeback_inodes_sb() instead of
writeback_inodes_sb_if_idle().

Signed-off-by: Miao Xie <miaox@...fujitsu.com>
---
 fs/ext4/inode.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c77b0bd..2dccb4d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2380,7 +2380,7 @@ static int ext4_nonda_switch(struct super_block *sb)
 	 * start pushing delalloc when 1/2 of free blocks are dirty.
 	 */
 	if (free_blocks < 2 * dirty_blocks)
-		writeback_inodes_sb_if_idle(sb, WB_REASON_FS_FREE_SPACE);
+		try_to_writeback_inodes_sb(sb, WB_REASON_FS_FREE_SPACE);
 
 	return 0;
 }
-- 
1.7.6.5
--
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