From: Theodore Ts'o <tytso@mit.edu>
Date: Tue, 17 Feb 2009 15:58:26 +0000 (-0500)
Subject: jbd2: Add barrier not supported test to journal_wait_on_commit_record
X-Git-Tag: v2.6.27.19~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bd8a233eea26fc037aaf5cccc2bb9c5b814740a4;p=pandora-kernel.git

jbd2: Add barrier not supported test to journal_wait_on_commit_record

(cherry picked from commit fd98496f467b3d26d05ab1498f41718b5ef13de5)

Xen doesn't report that barriers are not supported until buffer I/O is
reported as completed, instead of when the buffer I/O is submitted.
Add a check and a fallback codepath to journal_wait_on_commit_record()
to detect this case, so that attempts to mount ext4 filesystems on
LVM/devicemapper devices on Xen guests don't blow up with an "Aborting
journal on device XXX"; "Remounting filesystem read-only" error.

Thanks to Andreas Sundstrom for reporting this issue.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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