[PATCH 0/14] NFSv4.1 Server DRC rewrite Version 4

[andros@netapp.com]

NFSv4.1 Server DRC rewrite Version 4

This patch set applies to linux-nfs.org/~bfields/linux, for-2.6.31 branch
updated on 6-22-2009.

In response to bfield's comments I moved the DRC limit bug fixes to the front
of the series, consolidated patches replacing the single slot clientid DRC
into one patch and the replacement of the mulitple slot sequeqnce operation
DRC into another single patch.

The NFSv4.1 DRC is changed from a page based cache to
a buffer based cache. The logic for the single slot clientid cache has been
separated from the session slot logic to handle the CREATE_SESSION call
preceeded by a SEQUENCE and all the replay combinations therein.

The session DRC now caches encoded operations with the exception of the
SEQUENCE operation which for a replay is encoded with the current slot and
session values.  A review of message sizes indicates that a 512 byte buffer
for the operations is adequate.

Not addressed is replacing the nfsd4_check_drc_limit() post-operation checking
with a pre-operation processing estimate of the encoded per operation result

Testing:
4.1 mount: Connectathon and 4.1pynfs including the new create session replay
tests.
4.0 mount; Connectathon.

0001-nfsd41-use-globals-for-DRC-limits.patch
0002-nfsd41-change-from-page-to-memory-based-drc-limits.patch
0003-nfsd41-reclaim-DRC-memory-on-session-free.patch
0004-nfsd41-set-the-session-maximum-response-size-cached.patch
0005-nfsd41-remove-redundant-forechannel-max-requests-ch.patch
0006-nfsd41-change-check_slot_seqid-parameters.patch
0007-nfsd41-replace-create_session-DRC-with-xdr-structur.patch
0008-nfsd41-replace-page-based-DRC-with-buffer-based-DRC.patch
0009-nfsd41-rename-nfsd4_enc_uncached_replay.patch
0010-nfsd41-encode-replay-sequence-from-the-slot-values.patch
0011-nfsd41-fix-nfsd4_replay_cache_entry-comments.patch
0012-nfsd41-support-16-slots-per-session.patch
0013-nfsd41-add-test-for-failed-sequence-operation.patch
0014-nfsd41-remove-redundant-failed-sequence-check.patch

Comments welcome.

-->Andy