From: Theodore Ts'o <tytso@mit.edu>
Date: Sun, 21 Jun 2015 02:50:33 +0000 (-0400)
Subject: ext4: call sync_blockdev() before invalidate_bdev() in put_super()
X-Git-Tag: v3.2.71~68
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5dedaea4936981382ec0d9833ad372ebd3d8af57;p=pandora-kernel.git

ext4: call sync_blockdev() before invalidate_bdev() in put_super()

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@mit.edu>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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