From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Date: Sun, 10 Feb 2008 06:20:05 +0000 (-0500)
Subject: ext4: Fix circular locking dependency with migrate and rm.
X-Git-Tag: v2.6.25-rc1~10^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8009f9fb3067fef6c2ca0c16f6bac786ae28639d;p=pandora-kernel.git

ext4: Fix circular locking dependency with migrate and rm.

In order to prevent a circular locking dependency when an unlink
operation is racing with an ext4 migration, we delay taking i_data_sem
until just before switch the inode format, and use i_mutex to prevent
writes and truncates during the first part of the migration operation.

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

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