Adjust the internal NFS KPI to avoid the last traces of NFS_LEGACYRPC.

Approved by: re

Remove the old kernel RPC implementation and the NFS_LEGACYRPC option.

Approved by: re

Merge from HEAD

Remove the unmaintained University of Michigan NFSv4 client from 8.x
prior to 8.0-RELEASE. Rick Macklem's new and more feature-rich NFSv234
client and server are replacing it.

Discussed with: rmack

Remove the unmaintained University of Michigan NFSv4 client from 8.x
prior to 8.0-RELEASE. Rick Macklem's new and more feature-rich NFSv234
client and server are replacing it.

Discussed with: rmacklem

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Remove the thread argument from the FSD (File-System Dependent) parts of
the VFS. Now all the VFS_* functions and relating parts don't want the
context as long as it always refers to curthread.

In

Remove the thread argument from the FSD (File-System Dependent) parts of
the VFS. Now all the VFS_* functions and relating parts don't want the
context as long as it always refers to curthread.

In some points, in particular when dealing with VOPs and functions living
in the same namespace (eg. vflush) which still need to be converted,
pass curthread explicitly in order to retain the old behaviour.
Such loose ends will be fixed ASAP.

While here fix a bug: now, UFS_EXTATTR can be compiled alone without the
UFS_EXTATTR_AUTOSTART option.

VFS KPI is heavilly changed by this commit so thirdy parts modules needs
to be recompiled. Bump __FreeBSD_version in order to signal such
situation.

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- Merge from HEAD

When a stale file handle is encountered, purge all cached information about
an NFS node including the access and attribute caches. Previously the NFS
client only purged any name cache entries associ

When a stale file handle is encountered, purge all cached information about
an NFS node including the access and attribute caches. Previously the NFS
client only purged any name cache entries associated with the file.

PR: kern/123755
Submitted by: Jaakko Heinonen jh of saunalahti fi
Reported by: Timo Sirainen tss of iki fi
Reviewed by: rwatson, rmacklem
MFC after: 1 month

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Change the default timeout for caching attributes of a directory in the NFS
client from 30 seconds to 3 seconds. After the recent changes to add
caching of negative name cache lookups, a negative na

Change the default timeout for caching attributes of a directory in the NFS
client from 30 seconds to 3 seconds. After the recent changes to add
caching of negative name cache lookups, a negative name cache hit will
persist until the client notices the parent directory has changed. The
higher the attribute cache timeout on directories, the longer that can take,
so lower the default timeout for directories to match that of regular files.

Suggested by: bde, mohans
MFC after: 1 month

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Expand the per-node access cache to cache permissions for multiple users.
The number of entries in the cache defaults to 8 but is easily changed in
nfsclient/nfs.h. When the cache is filled, the old

Expand the per-node access cache to cache permissions for multiple users.
The number of entries in the cache defaults to 8 but is easily changed in
nfsclient/nfs.h. When the cache is filled, the oldest cache entry is
evicted when space is needed.

I mirrored the changes to the NFSv[23] client in the NFSv4 client to fix
compile breakage. However, the NFSv4 client doesn't actually use the
access cache currently.

Submitted by: rmacklem

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integrate from head@185615

Switch the default rpc implementation for NFS back to the new code. I believe
I have fixed the reported problems - if you still have trouble with it, please
contact me with as much detail as possible

Switch the default rpc implementation for NFS back to the new code. I believe
I have fixed the reported problems - if you still have trouble with it, please
contact me with as much detail as possible so that I can track down any other
issues as quickly as possible.

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Temporarily switch NFS back to the old RPC code while I try to diagnose and
fix the problems a few people have noticed with the new code. People who want
to continue testing the new code or who need

Temporarily switch NFS back to the old RPC code while I try to diagnose and
fix the problems a few people have noticed with the new code. People who want
to continue testing the new code or who need RPCSEC_GSS support should use
the new option NFS_NEWRPC to select it.

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Implement support for RPCSEC_GSS authentication to both the NFS client
and server. This replaces the RPC implementation of the NFS client and
server with the newer RPC implementation originally devel

Implement support for RPCSEC_GSS authentication to both the NFS client
and server. This replaces the RPC implementation of the NFS client and
server with the newer RPC implementation originally developed
(actually ported from the userland sunrpc code) to support the NFS
Lock Manager. I have tested this code extensively and I believe it is
stable and that performance is at least equal to the legacy RPC
implementation.

The NFS code currently contains support for both the new RPC
implementation and the older legacy implementation inherited from the
original NFS codebase. The default is to use the new implementation -
add the NFS_LEGACYRPC option to fall back to the old code. When I
merge this support back to RELENG_7, I will probably change this so
that users have to 'opt in' to get the new code.

To use RPCSEC_GSS on either client or server, you must build a kernel
which includes the KGSSAPI option and the crypto device. On the
userland side, you must build at least a new libc, mountd, mount_nfs
and gssd. You must install new versions of /etc/rc.d/gssd and
/etc/rc.d/nfsd and add 'gssd_enable=YES' to /etc/rc.conf.

As long as gssd is running, you should be able to mount an NFS
filesystem from a server that requires RPCSEC_GSS authentication. The
mount itself can happen without any kerberos credentials but all
access to the filesystem will be denied unless the accessing user has
a valid ticket file in the standard place (/tmp/krb5cc_<uid>). There
is currently no support for situations where the ticket file is in a
different place, such as when the user logged in via SSH and has
delegated credentials from that login. This restriction is also
present in Solaris and Linux. In theory, we could improve this in
future, possibly using Brooks Davis' implementation of variant
symlinks.

Supporting RPCSEC_GSS on a server is nearly as simple. You must create
service creds for the server in the form 'nfs/<fqdn>@<REALM>' and
install them in /etc/krb5.keytab. The standard heimdal utility ktutil
makes this fairly easy. After the service creds have been created, you
can add a '-sec=krb5' option to /etc/exports and restart both mountd
and nfsd.

The only other difference an administrator should notice is that nfsd
doesn't fork to create service threads any more. In normal operation,
there will be two nfsd processes, one in userland waiting for TCP
connections and one in the kernel handling requests. The latter
process will create as many kthreads as required - these should be
visible via 'top -H'. The code has some support for varying the number
of service threads according to load but initially at least, nfsd uses
a fixed number of threads according to the value supplied to its '-n'
option.

Sponsored by: Isilon Systems
MFC after: 1 month

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Re-implement the client side of rpc.lockd in the kernel. This implementation
provides the correct semantics for flock(2) style locks which are used by the
lockf(1) command line tool and the pidfile(3

Re-implement the client side of rpc.lockd in the kernel. This implementation
provides the correct semantics for flock(2) style locks which are used by the
lockf(1) command line tool and the pidfile(3) library. It also implements
recovery from server restarts and ensures that dirty cache blocks are written
to the server before obtaining locks (allowing multiple clients to use file
locking to safely share data).

Sponsored by: Isilon Systems
PR: 94256
MFC after: 2 weeks

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NFS MP scaling changes.
- Eliminate the hideous nfs_sndlock that serialized NFS/TCP request senders
thru the sndlock.
- Institute a new nfs_connectlock that serializes NFS/TCP reconnects. Add
log

NFS MP scaling changes.
- Eliminate the hideous nfs_sndlock that serialized NFS/TCP request senders
thru the sndlock.
- Institute a new nfs_connectlock that serializes NFS/TCP reconnects. Add
logic to wait for pending request senders to finish sending before
reconnecting. Dial down the sb_timeo for NFS/TCP sockets to 1 sec.
- Break out the nfs xid manipulation under a new nfs xid lock, rather than
over loading the nfs request lock for this purpose.
- Fix some of the locking in nfs_request.
Many thanks to Kris Kennaway for his help with this and for initiating the
MP scaling analysis and work. Kris also tested this patch thorougly.
Approved by: re@ (Ken Smith)

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Unstaticize nfs_iosize() in nfsclient and use it in nfs4client instead
of duplicating it except for larger style bugs in the copy.

Fix some nearby style bugs (including a harmless type mismatch)
in

Unstaticize nfs_iosize() in nfsclient and use it in nfs4client instead
of duplicating it except for larger style bugs in the copy.

Fix some nearby style bugs (including a harmless type mismatch)
in and near the remaining copy.

This is part of fixing collisions of the 2 nfs*client's names. Even
static names should have a unique prefixes so that they can be debugged
easily.

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1) Fix up locking in nfs_up() and nfs_down.
2) Reduce the acquisitions of the Giant lock in the nfs_socket.c paths significantly.
- We don't need to acquire Giant before tsleeping on lbolt anymore,

1) Fix up locking in nfs_up() and nfs_down.
2) Reduce the acquisitions of the Giant lock in the nfs_socket.c paths significantly.
- We don't need to acquire Giant before tsleeping on lbolt anymore,
since jhb specialcased lbolt handling in msleep.
- nfs_up() needs to acquire Giant only if printing the "server up"
message.
- nfs_timer() held Giant for the duration of the NFS timer processing,
just because the printing of the message in nfs_down() needed it
(and we acquire other locks in nfs_timer()). The acquisition of
Giant is moved down into nfs_down() now, reducing the time Giant is
held in that path.

Reported by: Kris Kennaway

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Fixed some style bugs (especially ones involving long lines and use
of __P(())). There are many more.

Since NFSv4 is not SMP safe, nfsiod needs to acquire Giant for NFSv4 mounts
before doing the read/write.

Reported by: Chuck Lever.

NFS over TCP retransmit behavior should default to a 60 second time out,
mimicing the NFS reference implementation.

NFS over TCP does not need fast retransmit timeouts, since network loss
and conges

NFS over TCP retransmit behavior should default to a 60 second time out,
mimicing the NFS reference implementation.

NFS over TCP does not need fast retransmit timeouts, since network loss
and congestion are managed by the transport (TCP), unlike with NFS over
UDP. A long timeout prevents the unnecessary retransmission of non-
idempotent NFS requests.

Reviewed by: mohans, silby, rees?
Sponsored by: Network Appliance, Incorporated

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Refactor the NFS over UDP retransmit timeout estimation logic to allow
the estimator to be more easily tuned and maintained.

There should be no functional change except there is now a lower limit
on

Refactor the NFS over UDP retransmit timeout estimation logic to allow
the estimator to be more easily tuned and maintained.

There should be no functional change except there is now a lower limit
on the retransmit timeout to prevent the client from retransmitting
faster than the server's disks can fill requests, and an upper limit
to prevent the estimator from taking to long to retransmit during a
server outage.

Reviewed by: mohan, kris, silby
Sponsored by: Network Appliance, Incorporated

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Changes to make the NFS client MP safe.

Thanks to Kris Kennaway for testing and sending lots of bugs my way.

Make nfs_timer() MPSAFE. With this change, the bottom half of the NFS
client (the interface with the protocol stack and callouts) is
Giant-free.

Submitted by: Mohan Srinivasan.

Remove unused cred arg from nfs_vinvalbuf() and many bogus arguments
passed for it.

/* -> /*- for license, minor formatting changes