From: Ilya Dryomov <idryomov@gmail.com>
Date: Mon, 16 Jan 2012 20:04:47 +0000 (+0200)
Subject: Btrfs: add BTRFS_AVAIL_ALLOC_BIT_SINGLE bit
X-Git-Tag: v3.3-rc1~26^2~12^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a46d11a8b06dd0431a3888fbc4856ea13a8e634f;p=pandora-kernel.git

Btrfs: add BTRFS_AVAIL_ALLOC_BIT_SINGLE bit

Right now on-disk BTRFS_BLOCK_GROUP_* profile bits are used for
avail_{data,metadata,system}_alloc_bits fields, which gather info about
available allocation profiles in the FS.  When chunk is created or read
from disk, its profile is OR'ed with the corresponding avail_alloc_bits
field.  Since SINGLE is denoted by 0 in the on-disk format, currently
there is no way to tell when such chunks become avaialble.  Restriper
needs that information, so add a separate bit for SINGLE profile.

This bit is going to be in-memory only, it should never be written out
to disk, so it's not a disk format change.  However to avoid remappings
in future, reserve corresponding on-disk bit.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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