src-test2/sys/nfsserver, branch release/8.4.0

MFC 245508,245566,245568,245611,245909:

2013-02-28T21:58:07Z

Various fixes to timestamps in NFS: - Use the VA_UTIMES_NULL flag to detect when NULL was passed to utimes() instead of comparing the desired time against the current time as a heuristic. - Remove unused nfs_curusec(). - Use vfs_timestamp() to set file timestamps rather than invoking getmicrotime() or getnanotime() directly in NFS. - Use NFSD_MONOSEC (which maps to time_uptime) instead of the seconds portion of wall-time stamps to manage timeouts on events. - Remove unused nd_starttime from the per-request structure in the new NFS server. - Use nanotime() for the modification time on a delegation to get as precise a time as possible. - Use time_second instead of extracting the second from a call to getmicrotime().

Partial merge of r218345:

2012-02-15T17:09:26Z

Unless "cnt" exceeded MAX_COMMIT_COUNT, nfsrv_commit() and nfsvno_fsync() were incorrectly calling vm_object_page_clean(). They were passing the length of the range rather than the ending offset of the range. Reviewed by: kib

MFC 228185:

2012-01-05T18:50:37Z

Enhance the sequential access heuristic used to perform readahead in the NFS server and reuse it for writes as well to allow writes to the backing store to be clustered.

MFC: r223309

2011-07-04T00:24:59Z

Fix the kgssapi so that it can be loaded as a module. Currently the NFS subsystems use five of the rpcsec_gss/kgssapi entry points, but since it was not obvious which others might be useful, all nineteen were included. Basically the nineteen entry points are set in a structure called rpc_gss_entries and inline functions defined in sys/rpc/rpcsec_gss.h check for the entry points being non-NULL and then call them. A default value is returned otherwise.

MFC r216565,r216631,r216632,r216633,r216774:

2010-12-30T09:45:26Z

r216565: Reduce lock scope a little. r216631: On error, unbusy file system and jump to the end, so we won't try to unlock NULL *vpp. Reviewed by: kib r216632: - Move pubflag and lockflag handling from nfsrv_fhtovp() to nfs_namei() - this is the only place that is different from all the other nfsrv_fhtovp() consumers. This simplifies nfsrv_fhtovp() a bit and also eliminates one vn_lock/VOP_UNLOCK() cycle in case of NFSv3. - Implement NFSRV_FLAG_BUSY flag for nfsrv_fhtovp() that tells it to leave mount point busy. Reviewed by: kib r216633: Use newly added NFSRV_FLAG_BUSY flag for nfsrv_fhtovp() to keep mount point busy. This fixes a race where we can pass invalid mount point to VFS_VGET() via vp->v_mount when exported file system was forcibly unmounted between nfsrv_fhtovp() and VFS_VGET(). Reviewed by: kib r216774: ZFS might not return monotonically increasing directory offset cookies, so turn off UFS-specific hack that assumes so in ZFS case. Before the change we can miss returning some directory entries to a NFS client. I believe that the hack should be moved to ufs_readdir(), but until we find somebody who will do it, turn it off for ZFS in NFS server code. Submitted by: rmacklem Discussed with: rmacklem, mckusick

MFC r216454:

2010-12-26T13:14:36Z

VOP_ISLOCKED() should not be used to determine if the vnode is locked. Explicitely track the locked status of the vnode. Approved by: re (bz)

MFC r214851:

2010-11-08T10:18:01Z

Fix a bug in r214049. The nvp == vp case shall be handled specially only for !usevget case. If VFS_VGET is working, the vnode shared lock is obtained recursively and vput() shall be done, not vunref().

MFC r214049:

2010-11-03T08:34:00Z

When readdirplus() is handled on the exported filesystem that does not support VFS_VGET, like msdosfs, do not call VOP_LOOKUP() for dotdot on the root directory. Our filesystems expect that VFS handles dotdot lookups on root on its own.

MFC r211854:

2010-11-02T22:30:19Z

- When VFS_VGET() is not supported, switch to VOP_LOOKUP(). - We are fine by only share-locking the vnode. - Remove assertion that doesn't hold for ZFS where we cross mount points boundaries by going into .zfs/snapshot//. Reviewed by: rmacklem Reminded by: kib

MFC: r205661

2010-04-09T01:14:39Z

Patch the regular NFS server so that it returns ESTALE to the client for all errors returned by VFS_FHTOVP(). This is required to ensure that EIO doesn't get returned to the client when ZFS is used as the server file system.