linux-kernel - [PATCH 3.19.y-ckt 144/251] ext4: call sync_blockdev() before invalidate_bdev() in put

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Message-Id: <1437008972-9140-145-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jul 2015 18:07:45 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Theodore Ts'o <tytso@....edu>, Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 144/251] ext4: call sync_blockdev() before invalidate_bdev() in put_super()

3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Theodore Ts'o <tytso@....edu>

commit 89d96a6f8e6491f24fc8f99fd6ae66820e85c6c1 upstream.

Normally all of the buffers will have been forced out to disk before
we call invalidate_bdev(), but there will be some cases, where a file
system operation was aborted due to an ext4_error(), where there may
still be some dirty buffers in the buffer cache for the device.  So
try to force them out to memory before calling invalidate_bdev().

This fixes a warning triggered by generic/081:

WARNING: CPU: 1 PID: 3473 at /usr/projects/linux/ext4/fs/block_dev.c:56 __blkdev_put+0xb5/0x16f()

Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 fs/ext4/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index fc29b2c..e820414 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -822,6 +822,7 @@ static void ext4_put_super(struct super_block *sb)
 		dump_orphan_list(sb, sbi);
 	J_ASSERT(list_empty(&sbi->s_orphan));
 
+	sync_blockdev(sb->s_bdev);
 	invalidate_bdev(sb->s_bdev);
 	if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 		/*
-- 
1.9.1

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