From: Chuck Lever <cel@netapp.com>
Date: Mon, 20 Mar 2006 18:44:34 +0000 (-0500)
Subject: NFS: Replace atomic_t variables in nfs_direct_req with a single spin lock
X-Git-Tag: v2.6.17-rc1~667^2~47
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15ce4a0c1ce0d5e288398cb9e5493fd4e55e2025;p=pandora-kernel.git

NFS: Replace atomic_t variables in nfs_direct_req with a single spin lock

Three atomic_t variables cause a lot of bus locking.  Because they are all
used in the same places in the code, just use a single spin lock.

Now that the atomic_t variables are gone, we can remove the request size
limitation since the code no longer depends on the limited width of atomic_t
on some platforms.

Test plan:
Compile with CONFIG_NFS and CONFIG_NFS_DIRECTIO enabled.  Millions of fsx
operations, iozone, OraSim.

Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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