[ewg] [PATCH] NFS-RDMA backport for RHEL 5.2

[Jon Mason]

Hey Vlad,

I wanted to get you the NFS-RDMA backport patches I have queued up prior
to rc1 being built.  I have this patch (RHEL5.2), as well as 2.6.22, and
2.6.25 (which I will be sending in separate e-mails).

This patch contains the changes necessary to get NFS-RDMA 99% working on
RHEL5.2.  It 100% passes of the connectathon testcases when using RDMA.
When using TCP, 1 testcase hangs (for which I've found a code hack to
work around, but not a fix).  The testcase is the 30MB transfer in the
"special" tests, and is 100% reproducible.

With the attached patch, you can now enable the nfs-rdma-mod by default
and run it through your nightly build tests.

There is one problem with nfs-utils, which will necessitate including it
in the OFED distribution.  Currently, there is a check for the kernel
version you are running when running the mount.nfs command.  This check
is to verify if one is running a kernel greater than 2.6.22.  If not,
then it will not allow a mount with RDMA as an option.  In earlier
versions, there was an override option of "-i".  This has since been
removed for an unknown reason (but if you run `mount.nfs`, you can see
that they forgot to remove 'i' from "usage" options).  I will send them
a patch to fix this in the latest version, but this will be a problem
that will require it to be built locally until such a time as that is
pulled in.

In the OFED tree, there is another problem that needs to be addressed.
There are kernel header files that are being automatically imported via
the OFED tree.  The redefinition of these kernel data structs causes
major problems.  Specifically, these header files are
include/linux/pipe_fs_i.h and include/linux/splice.h.  These files
redefine pipe_inode_info and pipe_buf_operations and many other structs
used in OFED and the underlying kernel.  They should NOT be included,
and can cause problems when backporting NFS-RDMA to other kernel
versions.  I have removed their usage in my patches, but they should be
removed from the OFED tree as they should not be needed (as we want to
use the native header files for the kernel we are compiling against).

Thanks,
Jon
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