From: Dave Chinner <dchinner@redhat.com>
Date: Mon, 23 Feb 2015 10:44:54 +0000 (+1100)
Subject: xfs: use i_mmaplock on write faults
X-Git-Tag: omap-for-v4.1/fixes-rc1~44^2~5^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=075a924d45cc69c75a35f20b4912b85aa98b180a;p=pandora-kernel.git

xfs: use i_mmaplock on write faults

Take the i_mmaplock over write page faults. These come through the
->page_mkwrite callout, so we need to wrap that calls with the
i_mmaplock.

This gives us a lock order of mmap_sem -> i_mmaplock -> page_lock
-> i_lock.

Also, move the page_mkwrite wrapper to the same region of xfs_file.c
as the read fault wrappers and add a tracepoint.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
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