[PATCH 0/4] NFS: Add READ_PLUS support

[<Anna.Schumaker@netapp.com>]

From: Anna Schumaker <Anna.Schumaker@Netapp.com>

These patches add server support for the NFS v4.2 operation READ_PLUS.

I noticed a race condition in the 3rd patch when I start needing vfs_llseek()
to determine if I should encode the next segment as either data or a hole.  It
is possible that the file could change on us between each of the seek calls,
so we don't know if we are actually at a hole or data segment.  I don't want to
add new locks to the NFS server for this case, so instead I've decided to
encode any "quantum data" segments as if they were actually data.

I tested these patches using xfstests, specificially generic/075, generic/091,
generic/112, generic/127, generic/210, and generic/263.  Additionally, three
new tests are run once READ_PLUS support has been added: generic/213,
generic/214, and generic/228.

These patches and the corresponding client changes are available in the
[read_plus] branch of

	git://git.linux-nfs.org/projects/anna/linux-nfs.git

Questions?  Comments?  Thoughts?

Anna


Anna Schumaker (4):
  NFSD: nfsd4_encode_read() should encode eof and maxcount
  NFSD: Add READ_PLUS support for data segments
  NFSD: Add support for encoding holes in files
  NFSD: Add support for encoding multiple segments

 fs/nfsd/nfs4proc.c |  16 +++++
 fs/nfsd/nfs4xdr.c  | 174 +++++++++++++++++++++++++++++++++++++++++------------
 2 files changed, 152 insertions(+), 38 deletions(-)

-- 
2.1.3