From: Ilya Dryomov <idryomov@gmail.com>
Date: Tue, 15 Feb 2011 18:14:25 +0000 (+0000)
Subject: Btrfs: make btrfs_rm_device() fail gracefully
X-Git-Tag: v2.6.38-rc7~30^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b3517e9136824346227b7b04f8f7ea1f3a726cc;p=pandora-kernel.git

Btrfs: make btrfs_rm_device() fail gracefully

If shrinking done as part of the online device removal fails add that
device back to the allocation list and increment the rw_devices counter.
This fixes two bugs:

1) we could have a perfectly good device out of alloc list for no good
reason;

2) in the btrfs consisting of two devices, failure in btrfs_rm_device()
could lead to a situation where it was impossible to remove any of the
devices because of the "unable to remove the only writeable device"
error.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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