From: Stefan Behrens <sbehrens@giantdisaster.de>
Date: Tue, 10 Jul 2012 13:30:17 +0000 (-0600)
Subject: Btrfs: avoid I/O repair BUG() from btree_read_extent_buffer_pages()
X-Git-Tag: v3.6-rc1~81^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c0901581ad077004145c9ee80e843fba71c100b8;p=pandora-kernel.git

Btrfs: avoid I/O repair BUG() from btree_read_extent_buffer_pages()

From btree_read_extent_buffer_pages(), currently repair_io_failure()
can be called with mirror_num being zero when submit_one_bio() returned
an error before. This used to cause a BUG_ON(!mirror_num) in
repair_io_failure() and indeed this is not a case that needs the I/O
repair code to rewrite disk blocks.
This commit prevents calling repair_io_failure() in this case and thus
avoids the BUG_ON() and malfunction.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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