From: Chuck Lever <cel@netapp.com>
Date: Mon, 20 Mar 2006 18:44:28 +0000 (-0500)
Subject: NFS: clean up NFS client's a_ops->direct_IO method
X-Git-Tag: v2.6.17-rc1~667^2~61
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b8a32e2b8b7fefff994c89d398b6ac920a195b43;p=pandora-kernel.git

NFS: clean up NFS client's a_ops->direct_IO method

The NFS client's a_ops->direct_IO method, nfs_direct_IO, is required to
be present to allow NFS files to be opened with O_DIRECT, but is never
called because the NFS client shunts reads and writes to files opened
with O_DIRECT directly to its own routines.

Gut the nfs_direct_IO function.  This eliminates the only part of the
NFS client's direct I/O path that requires support for multi-segment
iovs, allowing further simplification in subsequent patches.

Test plan:
Compile the kernel with CONFIG_NFS and CONFIG_NFS_DIRECTIO enabled.  Millions
of fsx-odirect ops.  OraSim.

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