From: Mingming Cao <cmm@us.ibm.com>
Date: Fri, 11 Jul 2008 23:27:31 +0000 (-0400)
Subject: ext4: Invert lock ordering of page_lock and transaction start in delalloc
X-Git-Tag: v2.6.27-rc1~1087^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61628a3f3a37af2bf25daf8e26fd6b76a78c4f76;p=pandora-kernel.git

ext4: Invert lock ordering of page_lock and transaction start in delalloc

With the reverse locking, we need to start a transation before taking
the page lock, so in ext4_da_writepages() we need to break the write-out
into chunks, and restart the journal for each chunck to ensure the
write-out fits in a single transaction.

Updated patch from Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
which fixes delalloc sync hang with journal lock inversion, and address
the performance regression issue.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---

Reading git-diff-tree failed