From: Dave Chinner <dchinner@redhat.com>
Date: Thu, 23 Dec 2010 00:57:37 +0000 (+1100)
Subject: xfs: use KM_NOFS for allocations during attribute list operations
X-Git-Tag: v2.6.38-rc1~44^2~42
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=622d81494fa32343a4b97b607619656c7a4a6d1a;p=pandora-kernel.git

xfs: use KM_NOFS for allocations during attribute list operations

When listing attributes, we are doiing memory allocations under the
inode ilock using only KM_SLEEP. This allows memory allocation to
recurse back into the filesystem and do writeback, which may the
ilock we already hold on the current inode. THis will deadlock.
Hence use KM_NOFS for such allocations outside of transaction
context to ensure that reclaim recursion does not occur.

Reported-by: Nick Piggin <npiggin@gmail.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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