[PATCH 0/5] NFSv4.1 DRC rewrite version 6

[andros@netapp.com]

NFSv4.1 DRC Rewrite Version 6

These patches apply against git://linux-nfs.org/~bfields/linux: for-2.6.32
branch and continue to rewrite the NFSv4.1 Sessions DRC. Besides some
bug fixes:

1) The bound on the fore channel per-session DRC size are rewritten.
Instead of just using a maximum number of slots to bound the size,
The server gives the client the number of ca_maxresponsesize_cached slots it
requests bounded by NFSD_SLOT_CACHE_SIZE, NFSD_MAX_MEM_PER_SESSION and by
nfsd_drc_max_mem. Do not allow more than NFSD_MAX_SLOTS_PER_SESSION.

This allows clients to tailor a session to usage.
For example, an I/O session (READ/WRITE/COMMIT only) can have a much smaller
ca_maxresponsesize_cached (for only WRITE/COMMIt compound responses) and a lot
larger ca_maxresponses to service a large in-flight data window.

2) the page-based DRC is replaced with a buffer based DRC with each
slot table entry (struct nfsd4_slot + cache) allocated separately.
This allocation prepares us for slot size re-negotiation via the SEQUENCE
operation target and high slot id arguments.

Testing:

NFSv4.1 mount: pynfs tests - including the SEQUENCE replay cache tests.
connectathon tests.

NFSv4.0 mount: connectathon tests.

-->Andy

0001-nfsd41-expand-solo-sequence-check.patch
0002-nfsd41-bound-forechannel-drc-size-by-memory-usage.patch
0003-nfsd41-use-session-maxreqs-for-sequence-target-and.patch
0004-nfsd41-replace-nfserr_resource-in-pure-nfs41-respon.patch
0005-nfsd41-replace-page-based-DRC-with-buffer-based-DRC.patch