delta/linux.git/include/linux/sunrpc, branch proc-cmdline

Merge tag 'nfs-for-4.17-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

2018-04-12T19:55:50+00:00

Pull NFS client updates from Anna Schumaker:
 "Stable bugfixes:
   - xprtrdma: Fix corner cases when handling device removal # v4.12+
   - xprtrdma: Fix latency regression on NUMA NFS/RDMA clients # v4.15+

  Features:
   - New sunrpc tracepoint for RPC pings
   - Finer grained NFSv4 attribute checking
   - Don't unnecessarily return NFS v4 delegations

  Other bugfixes and cleanups:
   - Several other small NFSoRDMA cleanups
   - Improvements to the sunrpc RTT measurements
   - A few sunrpc tracepoint cleanups
   - Various fixes for NFS v4 lock notifications
   - Various sunrpc and NFS v4 XDR encoding cleanups
   - Switch to the ida_simple API
   - Fix NFSv4.1 exclusive create
   - Forget acl cache after setattr operation
   - Don't advance the nfs_entry readdir cookie if xdr decoding fails"

* tag 'nfs-for-4.17-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (47 commits)
  NFS: advance nfs_entry cookie only after decoding completes successfully
  NFSv3/acl: forget acl cache after setattr
  NFSv4.1: Fix exclusive create
  NFSv4: Declare the size up to date after it was set.
  nfs: Use ida_simple API
  NFSv4: Fix the nfs_inode_set_delegation() arguments
  NFSv4: Clean up CB_GETATTR encoding
  NFSv4: Don't ask for attributes when ACCESS is protected by a delegation
  NFSv4: Add a helper to encode/decode struct timespec
  NFSv4: Clean up encode_attrs
  NFSv4; Clean up XDR encoding of type bitmap4
  NFSv4: Allow GFP_NOIO sleeps in decode_attr_owner/decode_attr_group
  SUNRPC: Add a helper for encoding opaque data inline
  SUNRPC: Add helpers for decoding opaque and string types
  NFSv4: Ignore change attribute invalidations if we hold a delegation
  NFS: More fine grained attribute tracking
  NFS: Don't force unnecessary cache invalidation in nfs_update_inode()
  NFS: Don't redirty the attribute cache in nfs_wcc_update_inode()
  NFS: Don't force a revalidation of all attributes if change is missing
  NFS: Convert NFS_INO_INVALID flags to unsigned long
  ...

NFSv4; Clean up XDR encoding of type bitmap4

2018-04-10T20:06:22+00:00

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

SUNRPC: Add a helper for encoding opaque data inline

2018-04-10T20:06:22+00:00

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

SUNRPC: Add helpers for decoding opaque and string types

2018-04-10T20:06:22+00:00

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

SUNRPC: Make num_reqs a non-atomic integer

2018-04-10T20:06:22+00:00

If recording xprt->stat.max_slots is moved into xprt_alloc_slot,
then xprt->num_reqs is never manipulated outside
xprt->reserve_lock. There's no longer a need for xprt->num_reqs to
be atomic.

Signed-off-by: Chuck Lever 
Signed-off-by: Anna Schumaker

SUNRPC: Move xprt_update_rtt callsite

2018-04-10T20:06:22+00:00

Since commit 33849792cbcd ("xprtrdma: Detect unreachable NFS/RDMA
servers more reliably"), the xprtrdma transport now has a ->timer
callout. But xprtrdma does not need to compute RTT data, only UDP
needs that. Move the xprt_update_rtt call into the UDP transport
implementation.

Signed-off-by: Chuck Lever 
Signed-off-by: Anna Schumaker

xprtrdma: "Support" call-only RPCs

2018-04-10T20:06:22+00:00

RPC-over-RDMA version 1 credit accounting relies on there being a
response message for every RPC Call. This means that RPC procedures
that have no reply will disrupt credit accounting, just in the same
way as a retransmit would (since it is sent because no reply has
arrived). Deal with the "no reply" case the same way.

Signed-off-by: Chuck Lever 
Signed-off-by: Anna Schumaker

NFSD: Clean up legacy NFS SYMLINK argument XDR decoders

2018-04-03T19:08:16+00:00

Move common code in NFSD's legacy SYMLINK decoders into a helper.
The immediate benefits include:

 - one fewer data copies on transports that support DDP
 - consistent error checking across all versions
 - reduction of code duplication
 - support for both legal forms of SYMLINK requests on RDMA
   transports for all versions of NFS (in particular, NFSv2, for
   completeness)

In the long term, this helper is an appropriate spot to perform a
per-transport call-out to fill the pathname argument using, say,
RDMA Reads.

Filling the pathname in the proc function also means that eventually
the incoming filehandle can be interpreted so that filesystem-
specific memory can be allocated as a sink for the pathname
argument, rather than using anonymous pages.

Signed-off-by: Chuck Lever 
Signed-off-by: J. Bruce Fields

NFSD: Clean up legacy NFS WRITE argument XDR decoders

2018-04-03T19:08:16+00:00

Move common code in NFSD's legacy NFS WRITE decoders into a helper.
The immediate benefit is reduction of code duplication and some nice
micro-optimizations (see below).

In the long term, this helper can perform a per-transport call-out
to fill the rq_vec (say, using RDMA Reads).

The legacy WRITE decoders and procs are changed to work like NFSv4,
which constructs the rq_vec just before it is about to call
vfs_writev.

Why? Calling a transport call-out from the proc instead of the XDR
decoder means that the incoming FH can be resolved to a particular
filesystem and file. This would allow pages from the backing file to
be presented to the transport to be filled, rather than presenting
anonymous pages and copying or flipping them into the file's page
cache later.

I also prefer using the pages in rq_arg.pages, instead of pulling
the data pages directly out of the rqstp::rq_pages array. This is
currently the way the NFSv3 write decoder works, but the other two
do not seem to take this approach. Fixing this removes the only
reference to rq_pages found in NFSD, eliminating an NFSD assumption
about how transports use the pages in rq_pages.

Lastly, avoid setting up the first element of rq_vec as a zero-
length buffer. This happens with an RDMA transport when a normal
Read chunk is present because the data payload is in rq_arg's
page list (none of it is in the head buffer).

Signed-off-by: Chuck Lever 
Signed-off-by: J. Bruce Fields

svc: Report xprt dequeue latency

2018-04-03T19:08:13+00:00

Record the time between when a rqstp is enqueued on a transport
and when it is dequeued. This includes how long the rqstp waits on
the queue and how long it takes the kernel scheduler to wake a
nfsd thread to service it.

The svc_xprt_dequeue trace point is altered to include the number
of microseconds between xprt_enqueue and xprt_dequeue.

Signed-off-by: Chuck Lever 
Signed-off-by: J. Bruce Fields