linux-ext4 - ext4: removal of alloc_sem locks from block allocation paths

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Date:	Sun, 20 Mar 2011 23:32:45 +0200
From:	amir73il@...rs.sourceforge.net
To:	tytso@....edu
Cc:	linux-ext4@...r.kernel.org
Subject: ext4: removal of alloc_sem locks from block allocation paths

The purpose of this patch set is the removal of grp->alloc_sem locks
from block allocation paths.

This resulting code is cleaner and should perform better in concurrent
allocating tasks workloads.

I ran several xfstests runs with these patches (4K block only).
I tried several online resizes and verifyed that both in-core and on-disk
group counters are correct.

ext4: move ext4_add_groupblocks() to mballoc.c
ext4: implement ext4_add_groupblocks() by freeing blocks
ext4: synchronize ext4_mb_init_group() with buddy page lock
ext4: teach ext4_mb_init_cache() to skip uptodate buddy caches
ext4: remove alloc_semp
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