From: Yan, Zheng <zheng.yan@oracle.com>
Date: Sun, 16 May 2010 14:46:25 +0000 (-0400)
Subject: Btrfs: Introduce contexts for metadata reservation
X-Git-Tag: v2.6.35-rc1~36^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f0486c68e4bd9a06a5904d3eeb3a0d73a83befb8;p=pandora-kernel.git

Btrfs: Introduce contexts for metadata reservation

Introducing metadata reseravtion contexts has two major advantages.
First, it makes metadata reseravtion more traceable. Second, it can
reclaim freed space and re-add them to the itself after transaction
committed.

Besides add btrfs_block_rsv structure and related helper functions,
This patch contains following changes:

Move code that decides if freed tree block should be pinned into
btrfs_free_tree_block().

Make space accounting more accurate, mainly for handling read only
block groups.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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