- Copy stable/10@285827 to releng/10.2 in preparation for 10.2-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.2.
- Update default pkg(8) configuration to use the quarterly branch.[1]

Discussed with: re, portmgr [1]
Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC: r283635
Make the size of the hash tables used by the NFSv4 server tunable.
No appreciable change in performance was observed after increasing
the sizes of these tables and then testing with a single client.
However, there was an email that indicated high CPU overheads for
a heavily loaded NFSv4 and it is hoped that increasing the sizes
of the hash tables via these tunables might help.
The tables remain the same size by default.

MFC: r281628
mav@ has found that NFS servers exporting ZFS file systems
can perform better when using a 128K read/write data size.
This patch changes NFS_MAXDATA from 64K to 128K so that
clients can use 128K for NFS mounts to allow this.
The patch also renames NFS_MAXDATA to NFS_SRVMAXIO so
that it is clear that it applies to the NFS server side
only. It also avoids a name conflict with the NFS_MAXDATA
defined in rpcsvc/nfs_prot.h, that is used for userland RPC.

MFC r275897:
Set NOCACHE flag for CREATE namei() calls, do not specially handle
MAKEENTRY in VOP_LOOKUP().

MFC: r268115
Merge the NFSv4.1 server code in projects/nfsv4.1-server over
into head. The code is not believed to have any effect
on the semantics of non-NFSv4.1 server behaviour.
It is a rather large merge, but I am hoping that there will
not be any regressions for the NFS server.

MFC: r267191
The new NFS server would not allow a hard link to be
created to a symlink. This restriction (which was
inherited from OpenBSD) is not required by the NFS RFCs.
Since this is allowed by the old NFS server, it is a
POLA violation to not allow it. This patch modifies the
new NFS server to allow this.

Fix NFS deadlock vulnerability. [SA-14:05]

Fix "Heartbleed" vulnerability and ECDSA Cache Side-channel
Attack in OpenSSL. [SA-14:06]

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Make it possible to force async at server side on new NFS server, similar
to the old one's nfs.nfsrv.async.

Please note that by enabling this option (default is disabled), the system
could potentionally have silent data corruption if the server crashes
before write is committed to non-volatile storage, as the client side have
no way to tell if the data is already written.

Submitted by: rmacklem
MFC after: 2 weeks

Fix the NFSv4 server so that it returns NFSERR_SYMLINK when
an attempt to do an Open operation on any type of file other
than VREG is done. A recent discussion on the IETF working group's
mailing list (nfsv4@ietf.org) decided that NFSERR_SYMLINK
should be returned for all non-regular files and not just symlinks,
so that the Linux client would work correctly.
This change does not affect the FreeBSD NFSv4 client and is not
believed to have a negative effect on other NFSv4 clients.

Reviewed by: zkirsch
Approved by: re (kib)
MFC after: 2 weeks

Fix an NFS server issue where it was not correctly setting the eof flag when a
READ had hit the end of the file. Also, clean up some cruft in the code.

Approved by: re (kib)
Reviewed by: rmacklem
MFC after: 2 weeks

Fix rename in the new NFS server so that it does not require a
recursive vnode lock on the directory for the case where the
new file name is in the same directory as the old one. The patch
handles this as a special case, recognized by the new directory
having the same file handle as the old one and just VREF()s the old
dir vnode for this case, instead of doing a second VFS_FHTOVP() to get it.
This is required so that the server will work for file systems like
msdosfs, that do not support recursive vnode locking.
This problem was discovered during recent testing by pho@
when exporting an msdosfs file system via the new NFS server.

Tested by: pho
Reviewed by: zkirsch
Approved by: re (kib)
MFC after: 2 weeks

Add DEXITCODE plumbing to NFS.

Isilon has the concept of an in-memory exit-code ring that saves the last exit
code of a function and allows for stack tracing. This is very helpful when
debugging tough issues.

This patch is essentially a no-op for BSD at this point, until we upstream
the dexitcode logic itself. The patch adds DEXITCODE calls to every NFS
function that returns an errno error code. A number of code paths were also
reorganized to have single exit paths, to reduce code duplication.

Submitted by: David Kwan <dkwan@isilon.com>
Reviewed by: rmacklem
Approved by: zml (mentor)
MFC after: 2 weeks

Simple find/replace of VOP_UNLOCK -> NFSVOPUNLOCK. This is done so that NFSVOPUNLOCK can be modified later to add enhanced logging and assertions.

Reviewed by: rmacklem
Approved by: zml (mentor)
MFC after: 2 weeks

Simple find/replace of vn_lock -> NFSVOPLOCK. This is done so that NFSVOPLOCK can be modified later to add enhanced logging and assertions.

Reviewed by: rmacklem
Approved by: zml (mentor)
MFC after: 2 weeks

Remove unnecessary thread pointer from VOPLOCK macros and current users.

Reviewed by: rmacklem
Approved by: zml (mentor)
MFC after: 2 weeks

Fix the new NFSv4 server so that it checks for VREAD_ACL when
a client does a Getattr for an ACL and not VREAD_ATTRIBUTES.
This was found during the recent NFSv4 interoperability Bakeathon.

MFC after: 2 weeks

Fix the new NFSv4 server so that it only allows Lookup of
directories and symbolic links when traversing non-exported
file systems. Found during the recent NFSv4 interoperability
Bakeathon.

MFC after: 2 weeks

Fix the experimental NFSv4 server so that it uses VOP_PATHCONF()
to determine if a file system supports NFSv4 ACLs. Since
VOP_PATHCONF() must be called with a locked vnode, the function
is called before nfsvno_fillattr() and the result is passed in
as an extra argument.

MFC after: 2 weeks

Modify the experimental NFSv4 server so that it handles
crossing of server mount points properly. The functions
nfsvno_fillattr() and nfsv4_fillattr() were modified to
take the extra arguments that are the mount point, a flag
to indicate that it is a file system root and the mounted
on fileno. The mount point argument needs to be busy when
nfsvno_fillattr() is called, since the vp argument is not
locked.

Reviewed by: kib
MFC after: 2 weeks

Since the VFS_LOCK_GIANT() code in the experimental NFS
server is broken and the major file systems are now all
mpsafe, modify the server so that it will only export
mpsafe file systems. This was discussed on freebsd-fs@
and removes a fair bit of crufty code.

MFC after: 12 days

Modify the experimental NFSv4 server so that the lookup
ops return a locked vnode. This ensures that the associated mount
point will always be valid for the code that follows the operation.
Also add a couple of additional checks
for non-error to the other functions that create file objects.

MFC after: 2 weeks

Delete some cruft from the experimental NFS server that was
only used by the OpenBSD port for its pseudo-fs.

MFC after: 2 weeks

Add checks for VI_DOOMED and vn_lock() failures to the
experimental NFS server, to handle the case where an
exported file system is forced dismounted while an RPC
is in progress. Further commits will fix the cases where
a mount point is used when the associated vnode isn't locked.

Reviewed by: kib
MFC after: 2 weeks

Modify the experimental NFS server so that it uses LK_SHARED
for RPC operations when it can. Since VFS_FHTOVP() currently
always gets an exclusively locked vnode and is usually called
at the beginning of each RPC, the RPCs for a given vnode will
still be serialized. As such, passing a lock type argument to
VFS_FHTOVP() would be preferable to doing the vn_lock() with
LK_DOWNGRADE after the VFS_FHTOVP() call.

Reviewed by: kib
MFC after: 2 weeks

Add an argument to nfsvno_getattr() in the experimental
NFS server, so that it can avoid calling VOP_ISLOCKED()
when the vnode is known to be locked. This will allow
LK_SHARED to be used for these cases, which happen to
be all the cases that can use LK_SHARED. This does not
fix any bug, but it reduces the number of calls to
VOP_ISLOCKED() and prepares the code so that it can be
switched to using LK_SHARED in a future patch.

Reviewed by: kib
MFC after: 2 weeks

Harden the experimental NFS server a little, by adding range
checks on the length of the client's open/lock owner name. Also,
add free()'s for one case where they were missing and would
have caused a leak if NFSERR_BADXDR had been replied. Probably
never happens, but the leak is now plugged, just in case.

MFC after: 2 weeks

Add SAVENAME to the cn_flags for all cases in the experimental
NFS server for the CREATE cn_nameiop where SAVESTART isn't set.
I was not aware that this needed to be done by the caller until
recently.

Tested by: lampa AT fit.vutbr.cz (link case)
Submitted by: lampa AT fit.vutbr.cz (link case)
MFC after: 2 weeks

Modify the experimental server so that it uses VOP_ACCESSX().
This is necessary in order to enable NFSv4 ACL support. The
argument to nfsvno_accchk() was changed to an accmode_t and
the function nfsrv_aclaccess() was no longer needed and,
therefore, deleted.

Reviewed by: trasz
MFC after: 2 weeks

Patch the experimental NFS server is a manner analagous to
r197525, so that the creation verifier is handled correctly
in va_atime for 64bit architectures. There were two problems.
One was that the code incorrectly assumed that
sizeof (struct timespec) == 8 and the other was that the tv_sec
field needs to be assigned from a signed 32bit integer, so that
sign extension occurs on 64bit architectures. This is required
for correct operation when exporting ZFS volumes.

Reviewed by: pjd
MFC after: 2 weeks

Fix the experimental nfs subsystem so that it builds with the
current NFSv4 ACLs, as defined in sys/acl.h. It still needs a
way to test a mount point for NFSv4 ACL support before it will
work. Until then, the NFSHASNFS4ACL() macro just always returns 0.

Approved by: kib (mentor)

Add NFSv4 root export checks to the DelegPurge, Renew and
ReleaseLockOwner operations analagous to what is already
in place for SetClientID and SetClientIDConfirm. These are
the five NFSv4 operations that do not use file handle(s),
so the checks are done using the NFSv4 root export entries
in /etc/exports.

Approved by: kib (mentor)

Apply changes to the experimental nfs server so that it uses the security
flavors as exported in FreeBSD-CURRENT. This allows it to use a
slightly modified mountd.c instead of a different utility.

Approved by: kib (mentor)

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.

Add the experimental nfs subtree to the kernel, that includes
support for NFSv4 as well as NFSv2 and 3.
It lives in 3 subdirs under sys/fs:
nfs - functions that are common to the client and server
nfsclient - a mutation of sys/nfsclient that call generic functions
to do RPCs and handle state. As such, it retains the
buffer cache handling characteristics and vnode semantics that
are found in sys/nfsclient, for the most part.
nfsserver - the server. It includes a DRC designed specifically for
NFSv4, that is used instead of the generic DRC in sys/rpc.
The build glue will be checked in later, so at this point, it
consists of 3 new subdirs that should not affect kernel building.

Approved by: kib (mentor)