The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/nfs_clvnops.c

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from nfs_vnops.c        8.16 (Berkeley) 5/27/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/8.3/sys/fs/nfsclient/nfs_clvnops.c 231948 2012-02-21 00:32:24Z kib $");
   37 
   38 /*
   39  * vnode op calls for Sun NFS version 2, 3 and 4
   40  */
   41 
   42 #include "opt_inet.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/kernel.h>
   46 #include <sys/systm.h>
   47 #include <sys/resourcevar.h>
   48 #include <sys/proc.h>
   49 #include <sys/mount.h>
   50 #include <sys/bio.h>
   51 #include <sys/buf.h>
   52 #include <sys/jail.h>
   53 #include <sys/malloc.h>
   54 #include <sys/mbuf.h>
   55 #include <sys/namei.h>
   56 #include <sys/socket.h>
   57 #include <sys/vnode.h>
   58 #include <sys/dirent.h>
   59 #include <sys/fcntl.h>
   60 #include <sys/lockf.h>
   61 #include <sys/stat.h>
   62 #include <sys/sysctl.h>
   63 #include <sys/signalvar.h>
   64 
   65 #include <vm/vm.h>
   66 #include <vm/vm_object.h>
   67 #include <vm/vm_extern.h>
   68 #include <vm/vm_object.h>
   69 
   70 #include <fs/nfs/nfsport.h>
   71 #include <fs/nfsclient/nfsnode.h>
   72 #include <fs/nfsclient/nfsmount.h>
   73 #include <fs/nfsclient/nfs.h>
   74 
   75 #include <net/if.h>
   76 #include <netinet/in.h>
   77 #include <netinet/in_var.h>
   78 
   79 #include <nfs/nfs_lock.h>
   80 
   81 /* Defs */
   82 #define TRUE    1
   83 #define FALSE   0
   84 
   85 extern struct nfsstats newnfsstats;
   86 extern int nfsrv_useacl;
   87 MALLOC_DECLARE(M_NEWNFSREQ);
   88 
   89 /*
   90  * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
   91  * calls are not in getblk() and brelse() so that they would not be necessary
   92  * here.
   93  */
   94 #ifndef B_VMIO
   95 #define vfs_busy_pages(bp, f)
   96 #endif
   97 
   98 static vop_read_t       nfsfifo_read;
   99 static vop_write_t      nfsfifo_write;
  100 static vop_close_t      nfsfifo_close;
  101 static int      nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
  102                     struct thread *);
  103 static vop_lookup_t     nfs_lookup;
  104 static vop_create_t     nfs_create;
  105 static vop_mknod_t      nfs_mknod;
  106 static vop_open_t       nfs_open;
  107 static vop_pathconf_t   nfs_pathconf;
  108 static vop_close_t      nfs_close;
  109 static vop_access_t     nfs_access;
  110 static vop_getattr_t    nfs_getattr;
  111 static vop_setattr_t    nfs_setattr;
  112 static vop_read_t       nfs_read;
  113 static vop_fsync_t      nfs_fsync;
  114 static vop_remove_t     nfs_remove;
  115 static vop_link_t       nfs_link;
  116 static vop_rename_t     nfs_rename;
  117 static vop_mkdir_t      nfs_mkdir;
  118 static vop_rmdir_t      nfs_rmdir;
  119 static vop_symlink_t    nfs_symlink;
  120 static vop_readdir_t    nfs_readdir;
  121 static vop_strategy_t   nfs_strategy;
  122 static vop_lock1_t      nfs_lock1;
  123 static  int     nfs_lookitup(struct vnode *, char *, int,
  124                     struct ucred *, struct thread *, struct nfsnode **);
  125 static  int     nfs_sillyrename(struct vnode *, struct vnode *,
  126                     struct componentname *);
  127 static vop_access_t     nfsspec_access;
  128 static vop_readlink_t   nfs_readlink;
  129 static vop_print_t      nfs_print;
  130 static vop_advlock_t    nfs_advlock;
  131 static vop_advlockasync_t nfs_advlockasync;
  132 static vop_getacl_t nfs_getacl;
  133 static vop_setacl_t nfs_setacl;
  134 
  135 /*
  136  * Global vfs data structures for nfs
  137  */
  138 struct vop_vector newnfs_vnodeops = {
  139         .vop_default =          &default_vnodeops,
  140         .vop_access =           nfs_access,
  141         .vop_advlock =          nfs_advlock,
  142         .vop_advlockasync =     nfs_advlockasync,
  143         .vop_close =            nfs_close,
  144         .vop_create =           nfs_create,
  145         .vop_fsync =            nfs_fsync,
  146         .vop_getattr =          nfs_getattr,
  147         .vop_getpages =         ncl_getpages,
  148         .vop_putpages =         ncl_putpages,
  149         .vop_inactive =         ncl_inactive,
  150         .vop_link =             nfs_link,
  151         .vop_lock1 =            nfs_lock1,
  152         .vop_lookup =           nfs_lookup,
  153         .vop_mkdir =            nfs_mkdir,
  154         .vop_mknod =            nfs_mknod,
  155         .vop_open =             nfs_open,
  156         .vop_pathconf =         nfs_pathconf,
  157         .vop_print =            nfs_print,
  158         .vop_read =             nfs_read,
  159         .vop_readdir =          nfs_readdir,
  160         .vop_readlink =         nfs_readlink,
  161         .vop_reclaim =          ncl_reclaim,
  162         .vop_remove =           nfs_remove,
  163         .vop_rename =           nfs_rename,
  164         .vop_rmdir =            nfs_rmdir,
  165         .vop_setattr =          nfs_setattr,
  166         .vop_strategy =         nfs_strategy,
  167         .vop_symlink =          nfs_symlink,
  168         .vop_write =            ncl_write,
  169         .vop_getacl =           nfs_getacl,
  170         .vop_setacl =           nfs_setacl,
  171 };
  172 
  173 struct vop_vector newnfs_fifoops = {
  174         .vop_default =          &fifo_specops,
  175         .vop_access =           nfsspec_access,
  176         .vop_close =            nfsfifo_close,
  177         .vop_fsync =            nfs_fsync,
  178         .vop_getattr =          nfs_getattr,
  179         .vop_inactive =         ncl_inactive,
  180         .vop_print =            nfs_print,
  181         .vop_read =             nfsfifo_read,
  182         .vop_reclaim =          ncl_reclaim,
  183         .vop_setattr =          nfs_setattr,
  184         .vop_write =            nfsfifo_write,
  185 };
  186 
  187 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
  188     struct componentname *cnp, struct vattr *vap);
  189 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
  190     int namelen, struct ucred *cred, struct thread *td);
  191 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
  192     char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
  193     char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
  194 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
  195     struct componentname *scnp, struct sillyrename *sp);
  196 
  197 /*
  198  * Global variables
  199  */
  200 #define DIRHDSIZ        (sizeof (struct dirent) - (MAXNAMLEN + 1))
  201 
  202 SYSCTL_DECL(_vfs_newnfs);
  203 
  204 static int      nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
  205 SYSCTL_INT(_vfs_newnfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
  206            &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
  207 
  208 static int      nfs_prime_access_cache = 0;
  209 SYSCTL_INT(_vfs_newnfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
  210            &nfs_prime_access_cache, 0,
  211            "Prime NFS ACCESS cache when fetching attributes");
  212 
  213 static int      newnfs_commit_on_close = 0;
  214 SYSCTL_INT(_vfs_newnfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
  215     &newnfs_commit_on_close, 0, "write+commit on close, else only write");
  216 
  217 static int      nfs_clean_pages_on_close = 1;
  218 SYSCTL_INT(_vfs_newnfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
  219            &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
  220 
  221 int newnfs_directio_enable = 0;
  222 SYSCTL_INT(_vfs_newnfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
  223            &newnfs_directio_enable, 0, "Enable NFS directio");
  224 
  225 /*
  226  * This sysctl allows other processes to mmap a file that has been opened
  227  * O_DIRECT by a process.  In general, having processes mmap the file while
  228  * Direct IO is in progress can lead to Data Inconsistencies.  But, we allow
  229  * this by default to prevent DoS attacks - to prevent a malicious user from
  230  * opening up files O_DIRECT preventing other users from mmap'ing these
  231  * files.  "Protected" environments where stricter consistency guarantees are
  232  * required can disable this knob.  The process that opened the file O_DIRECT
  233  * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
  234  * meaningful.
  235  */
  236 int newnfs_directio_allow_mmap = 1;
  237 SYSCTL_INT(_vfs_newnfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
  238            &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
  239 
  240 #if 0
  241 SYSCTL_INT(_vfs_newnfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
  242            &newnfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
  243 
  244 SYSCTL_INT(_vfs_newnfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
  245            &newnfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
  246 #endif
  247 
  248 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY                \
  249                          | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
  250                          | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
  251 
  252 /*
  253  * SMP Locking Note :
  254  * The list of locks after the description of the lock is the ordering
  255  * of other locks acquired with the lock held.
  256  * np->n_mtx : Protects the fields in the nfsnode.
  257        VM Object Lock
  258        VI_MTX (acquired indirectly)
  259  * nmp->nm_mtx : Protects the fields in the nfsmount.
  260        rep->r_mtx
  261  * ncl_iod_mutex : Global lock, protects shared nfsiod state.
  262  * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
  263        nmp->nm_mtx
  264        rep->r_mtx
  265  * rep->r_mtx : Protects the fields in an nfsreq.
  266  */
  267 
  268 static int
  269 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
  270     struct ucred *cred, u_int32_t *retmode)
  271 {
  272         int error = 0, attrflag, i, lrupos;
  273         u_int32_t rmode;
  274         struct nfsnode *np = VTONFS(vp);
  275         struct nfsvattr nfsva;
  276 
  277         error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
  278             &rmode, NULL);
  279         if (attrflag)
  280                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
  281         if (!error) {
  282                 lrupos = 0;
  283                 mtx_lock(&np->n_mtx);
  284                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  285                         if (np->n_accesscache[i].uid == cred->cr_uid) {
  286                                 np->n_accesscache[i].mode = rmode;
  287                                 np->n_accesscache[i].stamp = time_second;
  288                                 break;
  289                         }
  290                         if (i > 0 && np->n_accesscache[i].stamp <
  291                             np->n_accesscache[lrupos].stamp)
  292                                 lrupos = i;
  293                 }
  294                 if (i == NFS_ACCESSCACHESIZE) {
  295                         np->n_accesscache[lrupos].uid = cred->cr_uid;
  296                         np->n_accesscache[lrupos].mode = rmode;
  297                         np->n_accesscache[lrupos].stamp = time_second;
  298                 }
  299                 mtx_unlock(&np->n_mtx);
  300                 if (retmode != NULL)
  301                         *retmode = rmode;
  302         } else if (NFS_ISV4(vp)) {
  303                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  304         }
  305         return (error);
  306 }
  307 
  308 /*
  309  * nfs access vnode op.
  310  * For nfs version 2, just return ok. File accesses may fail later.
  311  * For nfs version 3, use the access rpc to check accessibility. If file modes
  312  * are changed on the server, accesses might still fail later.
  313  */
  314 static int
  315 nfs_access(struct vop_access_args *ap)
  316 {
  317         struct vnode *vp = ap->a_vp;
  318         int error = 0, i, gotahit;
  319         u_int32_t mode, wmode, rmode;
  320         int v34 = NFS_ISV34(vp);
  321         struct nfsnode *np = VTONFS(vp);
  322 
  323         /*
  324          * Disallow write attempts on filesystems mounted read-only;
  325          * unless the file is a socket, fifo, or a block or character
  326          * device resident on the filesystem.
  327          */
  328         if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
  329             VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
  330             VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
  331                 switch (vp->v_type) {
  332                 case VREG:
  333                 case VDIR:
  334                 case VLNK:
  335                         return (EROFS);
  336                 default:
  337                         break;
  338                 }
  339         }
  340         /*
  341          * For nfs v3 or v4, check to see if we have done this recently, and if
  342          * so return our cached result instead of making an ACCESS call.
  343          * If not, do an access rpc, otherwise you are stuck emulating
  344          * ufs_access() locally using the vattr. This may not be correct,
  345          * since the server may apply other access criteria such as
  346          * client uid-->server uid mapping that we do not know about.
  347          */
  348         if (v34) {
  349                 if (ap->a_accmode & VREAD)
  350                         mode = NFSACCESS_READ;
  351                 else
  352                         mode = 0;
  353                 if (vp->v_type != VDIR) {
  354                         if (ap->a_accmode & VWRITE)
  355                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  356                         if (ap->a_accmode & VAPPEND)
  357                                 mode |= NFSACCESS_EXTEND;
  358                         if (ap->a_accmode & VEXEC)
  359                                 mode |= NFSACCESS_EXECUTE;
  360                         if (ap->a_accmode & VDELETE)
  361                                 mode |= NFSACCESS_DELETE;
  362                 } else {
  363                         if (ap->a_accmode & VWRITE)
  364                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  365                         if (ap->a_accmode & VAPPEND)
  366                                 mode |= NFSACCESS_EXTEND;
  367                         if (ap->a_accmode & VEXEC)
  368                                 mode |= NFSACCESS_LOOKUP;
  369                         if (ap->a_accmode & VDELETE)
  370                                 mode |= NFSACCESS_DELETE;
  371                         if (ap->a_accmode & VDELETE_CHILD)
  372                                 mode |= NFSACCESS_MODIFY;
  373                 }
  374                 /* XXX safety belt, only make blanket request if caching */
  375                 if (nfsaccess_cache_timeout > 0) {
  376                         wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
  377                                 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
  378                                 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
  379                 } else {
  380                         wmode = mode;
  381                 }
  382 
  383                 /*
  384                  * Does our cached result allow us to give a definite yes to
  385                  * this request?
  386                  */
  387                 gotahit = 0;
  388                 mtx_lock(&np->n_mtx);
  389                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  390                         if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
  391                             if (time_second < (np->n_accesscache[i].stamp
  392                                 + nfsaccess_cache_timeout) &&
  393                                 (np->n_accesscache[i].mode & mode) == mode) {
  394                                 NFSINCRGLOBAL(newnfsstats.accesscache_hits);
  395                                 gotahit = 1;
  396                             }
  397                             break;
  398                         }
  399                 }
  400                 mtx_unlock(&np->n_mtx);
  401                 if (gotahit == 0) {
  402                         /*
  403                          * Either a no, or a don't know.  Go to the wire.
  404                          */
  405                         NFSINCRGLOBAL(newnfsstats.accesscache_misses);
  406                         error = nfs34_access_otw(vp, wmode, ap->a_td,
  407                             ap->a_cred, &rmode);
  408                         if (!error &&
  409                             (rmode & mode) != mode)
  410                                 error = EACCES;
  411                 }
  412                 return (error);
  413         } else {
  414                 if ((error = nfsspec_access(ap)) != 0) {
  415                         return (error);
  416                 }
  417                 /*
  418                  * Attempt to prevent a mapped root from accessing a file
  419                  * which it shouldn't.  We try to read a byte from the file
  420                  * if the user is root and the file is not zero length.
  421                  * After calling nfsspec_access, we should have the correct
  422                  * file size cached.
  423                  */
  424                 mtx_lock(&np->n_mtx);
  425                 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
  426                     && VTONFS(vp)->n_size > 0) {
  427                         struct iovec aiov;
  428                         struct uio auio;
  429                         char buf[1];
  430 
  431                         mtx_unlock(&np->n_mtx);
  432                         aiov.iov_base = buf;
  433                         aiov.iov_len = 1;
  434                         auio.uio_iov = &aiov;
  435                         auio.uio_iovcnt = 1;
  436                         auio.uio_offset = 0;
  437                         auio.uio_resid = 1;
  438                         auio.uio_segflg = UIO_SYSSPACE;
  439                         auio.uio_rw = UIO_READ;
  440                         auio.uio_td = ap->a_td;
  441 
  442                         if (vp->v_type == VREG)
  443                                 error = ncl_readrpc(vp, &auio, ap->a_cred);
  444                         else if (vp->v_type == VDIR) {
  445                                 char* bp;
  446                                 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
  447                                 aiov.iov_base = bp;
  448                                 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
  449                                 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
  450                                     ap->a_td);
  451                                 free(bp, M_TEMP);
  452                         } else if (vp->v_type == VLNK)
  453                                 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
  454                         else
  455                                 error = EACCES;
  456                 } else
  457                         mtx_unlock(&np->n_mtx);
  458                 return (error);
  459         }
  460 }
  461 
  462 
  463 /*
  464  * nfs open vnode op
  465  * Check to see if the type is ok
  466  * and that deletion is not in progress.
  467  * For paged in text files, you will need to flush the page cache
  468  * if consistency is lost.
  469  */
  470 /* ARGSUSED */
  471 static int
  472 nfs_open(struct vop_open_args *ap)
  473 {
  474         struct vnode *vp = ap->a_vp;
  475         struct nfsnode *np = VTONFS(vp);
  476         struct vattr vattr;
  477         int error;
  478         int fmode = ap->a_mode;
  479 
  480         if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
  481                 return (EOPNOTSUPP);
  482 
  483         /*
  484          * For NFSv4, we need to do the Open Op before cache validation,
  485          * so that we conform to RFC3530 Sec. 9.3.1.
  486          */
  487         if (NFS_ISV4(vp)) {
  488                 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
  489                 if (error) {
  490                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  491                             (gid_t)0);
  492                         return (error);
  493                 }
  494         }
  495 
  496         /*
  497          * Now, if this Open will be doing reading, re-validate/flush the
  498          * cache, so that Close/Open coherency is maintained.
  499          */
  500         mtx_lock(&np->n_mtx);
  501         if (np->n_flag & NMODIFIED) {
  502                 mtx_unlock(&np->n_mtx);
  503                 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  504                 if (error == EINTR || error == EIO) {
  505                         if (NFS_ISV4(vp))
  506                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  507                         return (error);
  508                 }
  509                 mtx_lock(&np->n_mtx);
  510                 np->n_attrstamp = 0;
  511                 if (vp->v_type == VDIR)
  512                         np->n_direofoffset = 0;
  513                 mtx_unlock(&np->n_mtx);
  514                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  515                 if (error) {
  516                         if (NFS_ISV4(vp))
  517                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  518                         return (error);
  519                 }
  520                 mtx_lock(&np->n_mtx);
  521                 np->n_mtime = vattr.va_mtime;
  522                 if (NFS_ISV4(vp))
  523                         np->n_change = vattr.va_filerev;
  524         } else {
  525                 mtx_unlock(&np->n_mtx);
  526                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  527                 if (error) {
  528                         if (NFS_ISV4(vp))
  529                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  530                         return (error);
  531                 }
  532                 mtx_lock(&np->n_mtx);
  533                 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
  534                     NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
  535                         if (vp->v_type == VDIR)
  536                                 np->n_direofoffset = 0;
  537                         mtx_unlock(&np->n_mtx);
  538                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  539                         if (error == EINTR || error == EIO) {
  540                                 if (NFS_ISV4(vp))
  541                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  542                                 return (error);
  543                         }
  544                         mtx_lock(&np->n_mtx);
  545                         np->n_mtime = vattr.va_mtime;
  546                         if (NFS_ISV4(vp))
  547                                 np->n_change = vattr.va_filerev;
  548                 }
  549         }
  550 
  551         /*
  552          * If the object has >= 1 O_DIRECT active opens, we disable caching.
  553          */
  554         if (newnfs_directio_enable && (fmode & O_DIRECT) &&
  555             (vp->v_type == VREG)) {
  556                 if (np->n_directio_opens == 0) {
  557                         mtx_unlock(&np->n_mtx);
  558                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  559                         if (error) {
  560                                 if (NFS_ISV4(vp))
  561                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  562                                 return (error);
  563                         }
  564                         mtx_lock(&np->n_mtx);
  565                         np->n_flag |= NNONCACHE;
  566                 }
  567                 np->n_directio_opens++;
  568         }
  569         mtx_unlock(&np->n_mtx);
  570         vnode_create_vobject(vp, vattr.va_size, ap->a_td);
  571         return (0);
  572 }
  573 
  574 /*
  575  * nfs close vnode op
  576  * What an NFS client should do upon close after writing is a debatable issue.
  577  * Most NFS clients push delayed writes to the server upon close, basically for
  578  * two reasons:
  579  * 1 - So that any write errors may be reported back to the client process
  580  *     doing the close system call. By far the two most likely errors are
  581  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
  582  * 2 - To put a worst case upper bound on cache inconsistency between
  583  *     multiple clients for the file.
  584  * There is also a consistency problem for Version 2 of the protocol w.r.t.
  585  * not being able to tell if other clients are writing a file concurrently,
  586  * since there is no way of knowing if the changed modify time in the reply
  587  * is only due to the write for this client.
  588  * (NFS Version 3 provides weak cache consistency data in the reply that
  589  *  should be sufficient to detect and handle this case.)
  590  *
  591  * The current code does the following:
  592  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
  593  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
  594  *                     or commit them (this satisfies 1 and 2 except for the
  595  *                     case where the server crashes after this close but
  596  *                     before the commit RPC, which is felt to be "good
  597  *                     enough". Changing the last argument to ncl_flush() to
  598  *                     a 1 would force a commit operation, if it is felt a
  599  *                     commit is necessary now.
  600  * for NFS Version 4 - flush the dirty buffers and commit them, if
  601  *                     nfscl_mustflush() says this is necessary.
  602  *                     It is necessary if there is no write delegation held,
  603  *                     in order to satisfy open/close coherency.
  604  *                     If the file isn't cached on local stable storage,
  605  *                     it may be necessary in order to detect "out of space"
  606  *                     errors from the server, if the write delegation
  607  *                     issued by the server doesn't allow the file to grow.
  608  */
  609 /* ARGSUSED */
  610 static int
  611 nfs_close(struct vop_close_args *ap)
  612 {
  613         struct vnode *vp = ap->a_vp;
  614         struct nfsnode *np = VTONFS(vp);
  615         struct nfsvattr nfsva;
  616         struct ucred *cred;
  617         int error = 0, ret, localcred = 0;
  618         int fmode = ap->a_fflag;
  619 
  620         if ((vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF))
  621                 return (0);
  622         /*
  623          * During shutdown, a_cred isn't valid, so just use root.
  624          */
  625         if (ap->a_cred == NOCRED) {
  626                 cred = newnfs_getcred();
  627                 localcred = 1;
  628         } else {
  629                 cred = ap->a_cred;
  630         }
  631         if (vp->v_type == VREG) {
  632             /*
  633              * Examine and clean dirty pages, regardless of NMODIFIED.
  634              * This closes a major hole in close-to-open consistency.
  635              * We want to push out all dirty pages (and buffers) on
  636              * close, regardless of whether they were dirtied by
  637              * mmap'ed writes or via write().
  638              */
  639             if (nfs_clean_pages_on_close && vp->v_object) {
  640                 VM_OBJECT_LOCK(vp->v_object);
  641                 vm_object_page_clean(vp->v_object, 0, 0, 0);
  642                 VM_OBJECT_UNLOCK(vp->v_object);
  643             }
  644             mtx_lock(&np->n_mtx);
  645             if (np->n_flag & NMODIFIED) {
  646                 mtx_unlock(&np->n_mtx);
  647                 if (NFS_ISV3(vp)) {
  648                     /*
  649                      * Under NFSv3 we have dirty buffers to dispose of.  We
  650                      * must flush them to the NFS server.  We have the option
  651                      * of waiting all the way through the commit rpc or just
  652                      * waiting for the initial write.  The default is to only
  653                      * wait through the initial write so the data is in the
  654                      * server's cache, which is roughly similar to the state
  655                      * a standard disk subsystem leaves the file in on close().
  656                      *
  657                      * We cannot clear the NMODIFIED bit in np->n_flag due to
  658                      * potential races with other processes, and certainly
  659                      * cannot clear it if we don't commit.
  660                      * These races occur when there is no longer the old
  661                      * traditional vnode locking implemented for Vnode Ops.
  662                      */
  663                     int cm = newnfs_commit_on_close ? 1 : 0;
  664                     error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td, cm, 0);
  665                     /* np->n_flag &= ~NMODIFIED; */
  666                 } else if (NFS_ISV4(vp)) { 
  667                         if (nfscl_mustflush(vp) != 0) {
  668                                 int cm = newnfs_commit_on_close ? 1 : 0;
  669                                 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td,
  670                                     cm, 0);
  671                                 /*
  672                                  * as above w.r.t races when clearing
  673                                  * NMODIFIED.
  674                                  * np->n_flag &= ~NMODIFIED;
  675                                  */
  676                         }
  677                 } else
  678                     error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  679                 mtx_lock(&np->n_mtx);
  680             }
  681             /* 
  682              * Invalidate the attribute cache in all cases.
  683              * An open is going to fetch fresh attrs any way, other procs
  684              * on this node that have file open will be forced to do an 
  685              * otw attr fetch, but this is safe.
  686              * --> A user found that their RPC count dropped by 20% when
  687              *     this was commented out and I can't see any requirement
  688              *     for it, so I've disabled it when negative lookups are
  689              *     enabled. (What does this have to do with negative lookup
  690              *     caching? Well nothing, except it was reported by the
  691              *     same user that needed negative lookup caching and I wanted
  692              *     there to be a way to disable it to see if it
  693              *     is the cause of some caching/coherency issue that might
  694              *     crop up.)
  695              */
  696             if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0)
  697                     np->n_attrstamp = 0;
  698             if (np->n_flag & NWRITEERR) {
  699                 np->n_flag &= ~NWRITEERR;
  700                 error = np->n_error;
  701             }
  702             mtx_unlock(&np->n_mtx);
  703         }
  704 
  705         if (NFS_ISV4(vp)) {
  706                 /*
  707                  * Get attributes so "change" is up to date.
  708                  */
  709                 if (error == 0 && nfscl_mustflush(vp) != 0) {
  710                         ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
  711                             NULL);
  712                         if (!ret) {
  713                                 np->n_change = nfsva.na_filerev;
  714                                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
  715                                     NULL, 0, 0);
  716                         }
  717                 }
  718 
  719                 /*
  720                  * and do the close.
  721                  */
  722                 ret = nfsrpc_close(vp, 0, ap->a_td);
  723                 if (!error && ret)
  724                         error = ret;
  725                 if (error)
  726                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  727                             (gid_t)0);
  728         }
  729         if (newnfs_directio_enable)
  730                 KASSERT((np->n_directio_asyncwr == 0),
  731                         ("nfs_close: dirty unflushed (%d) directio buffers\n",
  732                          np->n_directio_asyncwr));
  733         if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  734                 mtx_lock(&np->n_mtx);
  735                 KASSERT((np->n_directio_opens > 0), 
  736                         ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
  737                 np->n_directio_opens--;
  738                 if (np->n_directio_opens == 0)
  739                         np->n_flag &= ~NNONCACHE;
  740                 mtx_unlock(&np->n_mtx);
  741         }
  742         if (localcred)
  743                 NFSFREECRED(cred);
  744         return (error);
  745 }
  746 
  747 /*
  748  * nfs getattr call from vfs.
  749  */
  750 static int
  751 nfs_getattr(struct vop_getattr_args *ap)
  752 {
  753         struct vnode *vp = ap->a_vp;
  754         struct thread *td = curthread;  /* XXX */
  755         struct nfsnode *np = VTONFS(vp);
  756         int error = 0;
  757         struct nfsvattr nfsva;
  758         struct vattr *vap = ap->a_vap;
  759         struct vattr vattr;
  760 
  761         /*
  762          * Update local times for special files.
  763          */
  764         mtx_lock(&np->n_mtx);
  765         if (np->n_flag & (NACC | NUPD))
  766                 np->n_flag |= NCHG;
  767         mtx_unlock(&np->n_mtx);
  768         /*
  769          * First look in the cache.
  770          */
  771         if (ncl_getattrcache(vp, &vattr) == 0) {
  772                 vap->va_type = vattr.va_type;
  773                 vap->va_mode = vattr.va_mode;
  774                 vap->va_nlink = vattr.va_nlink;
  775                 vap->va_uid = vattr.va_uid;
  776                 vap->va_gid = vattr.va_gid;
  777                 vap->va_fsid = vattr.va_fsid;
  778                 vap->va_fileid = vattr.va_fileid;
  779                 vap->va_size = vattr.va_size;
  780                 vap->va_blocksize = vattr.va_blocksize;
  781                 vap->va_atime = vattr.va_atime;
  782                 vap->va_mtime = vattr.va_mtime;
  783                 vap->va_ctime = vattr.va_ctime;
  784                 vap->va_gen = vattr.va_gen;
  785                 vap->va_flags = vattr.va_flags;
  786                 vap->va_rdev = vattr.va_rdev;
  787                 vap->va_bytes = vattr.va_bytes;
  788                 vap->va_filerev = vattr.va_filerev;
  789                 /*
  790                  * Get the local modify time for the case of a write
  791                  * delegation.
  792                  */
  793                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  794                 return (0);
  795         }
  796 
  797         if (NFS_ISV34(vp) && nfs_prime_access_cache &&
  798             nfsaccess_cache_timeout > 0) {
  799                 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
  800                 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
  801                 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
  802                         nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
  803                         return (0);
  804                 }
  805         }
  806         error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
  807         if (!error)
  808                 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
  809         if (!error) {
  810                 /*
  811                  * Get the local modify time for the case of a write
  812                  * delegation.
  813                  */
  814                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  815         } else if (NFS_ISV4(vp)) {
  816                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  817         }
  818         return (error);
  819 }
  820 
  821 /*
  822  * nfs setattr call.
  823  */
  824 static int
  825 nfs_setattr(struct vop_setattr_args *ap)
  826 {
  827         struct vnode *vp = ap->a_vp;
  828         struct nfsnode *np = VTONFS(vp);
  829         struct thread *td = curthread;  /* XXX */
  830         struct vattr *vap = ap->a_vap;
  831         int error = 0;
  832         u_quad_t tsize;
  833 
  834 #ifndef nolint
  835         tsize = (u_quad_t)0;
  836 #endif
  837 
  838         /*
  839          * Setting of flags and marking of atimes are not supported.
  840          */
  841         if (vap->va_flags != VNOVAL)
  842                 return (EOPNOTSUPP);
  843 
  844         /*
  845          * Disallow write attempts if the filesystem is mounted read-only.
  846          */
  847         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  848             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  849             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  850             (vp->v_mount->mnt_flag & MNT_RDONLY))
  851                 return (EROFS);
  852         if (vap->va_size != VNOVAL) {
  853                 switch (vp->v_type) {
  854                 case VDIR:
  855                         return (EISDIR);
  856                 case VCHR:
  857                 case VBLK:
  858                 case VSOCK:
  859                 case VFIFO:
  860                         if (vap->va_mtime.tv_sec == VNOVAL &&
  861                             vap->va_atime.tv_sec == VNOVAL &&
  862                             vap->va_mode == (mode_t)VNOVAL &&
  863                             vap->va_uid == (uid_t)VNOVAL &&
  864                             vap->va_gid == (gid_t)VNOVAL)
  865                                 return (0);             
  866                         vap->va_size = VNOVAL;
  867                         break;
  868                 default:
  869                         /*
  870                          * Disallow write attempts if the filesystem is
  871                          * mounted read-only.
  872                          */
  873                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  874                                 return (EROFS);
  875                         /*
  876                          *  We run vnode_pager_setsize() early (why?),
  877                          * we must set np->n_size now to avoid vinvalbuf
  878                          * V_SAVE races that might setsize a lower
  879                          * value.
  880                          */
  881                         mtx_lock(&np->n_mtx);
  882                         tsize = np->n_size;
  883                         mtx_unlock(&np->n_mtx);
  884                         error = ncl_meta_setsize(vp, ap->a_cred, td,
  885                             vap->va_size);
  886                         mtx_lock(&np->n_mtx);
  887                         if (np->n_flag & NMODIFIED) {
  888                             tsize = np->n_size;
  889                             mtx_unlock(&np->n_mtx);
  890                             if (vap->va_size == 0)
  891                                 error = ncl_vinvalbuf(vp, 0, td, 1);
  892                             else
  893                                 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
  894                             if (error) {
  895                                 vnode_pager_setsize(vp, tsize);
  896                                 return (error);
  897                             }
  898                             /*
  899                              * Call nfscl_delegmodtime() to set the modify time
  900                              * locally, as required.
  901                              */
  902                             nfscl_delegmodtime(vp);
  903                         } else
  904                             mtx_unlock(&np->n_mtx);
  905                         /*
  906                          * np->n_size has already been set to vap->va_size
  907                          * in ncl_meta_setsize(). We must set it again since
  908                          * nfs_loadattrcache() could be called through
  909                          * ncl_meta_setsize() and could modify np->n_size.
  910                          */
  911                         mtx_lock(&np->n_mtx);
  912                         np->n_vattr.na_size = np->n_size = vap->va_size;
  913                         mtx_unlock(&np->n_mtx);
  914                 };
  915         } else {
  916                 mtx_lock(&np->n_mtx);
  917                 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 
  918                     (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
  919                         mtx_unlock(&np->n_mtx);
  920                         if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
  921                             (error == EINTR || error == EIO))
  922                                 return (error);
  923                 } else
  924                         mtx_unlock(&np->n_mtx);
  925         }
  926         error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
  927         if (error && vap->va_size != VNOVAL) {
  928                 mtx_lock(&np->n_mtx);
  929                 np->n_size = np->n_vattr.na_size = tsize;
  930                 vnode_pager_setsize(vp, tsize);
  931                 mtx_unlock(&np->n_mtx);
  932         }
  933         return (error);
  934 }
  935 
  936 /*
  937  * Do an nfs setattr rpc.
  938  */
  939 static int
  940 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
  941     struct thread *td)
  942 {
  943         struct nfsnode *np = VTONFS(vp);
  944         int error, ret, attrflag, i;
  945         struct nfsvattr nfsva;
  946 
  947         if (NFS_ISV34(vp)) {
  948                 mtx_lock(&np->n_mtx);
  949                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  950                         np->n_accesscache[i].stamp = 0;
  951                 np->n_flag |= NDELEGMOD;
  952                 mtx_unlock(&np->n_mtx);
  953         }
  954         error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
  955             NULL);
  956         if (attrflag) {
  957                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
  958                 if (ret && !error)
  959                         error = ret;
  960         }
  961         if (error && NFS_ISV4(vp))
  962                 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
  963         return (error);
  964 }
  965 
  966 /*
  967  * nfs lookup call, one step at a time...
  968  * First look in cache
  969  * If not found, unlock the directory nfsnode and do the rpc
  970  */
  971 static int
  972 nfs_lookup(struct vop_lookup_args *ap)
  973 {
  974         struct componentname *cnp = ap->a_cnp;
  975         struct vnode *dvp = ap->a_dvp;
  976         struct vnode **vpp = ap->a_vpp;
  977         struct mount *mp = dvp->v_mount;
  978         int flags = cnp->cn_flags;
  979         struct vnode *newvp;
  980         struct nfsmount *nmp;
  981         struct nfsnode *np, *newnp;
  982         int error = 0, attrflag, dattrflag, ltype;
  983         struct thread *td = cnp->cn_thread;
  984         struct nfsfh *nfhp;
  985         struct nfsvattr dnfsva, nfsva;
  986         struct vattr vattr;
  987         struct timespec dmtime;
  988         
  989         *vpp = NULLVP;
  990         if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
  991             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
  992                 return (EROFS);
  993         if (dvp->v_type != VDIR)
  994                 return (ENOTDIR);
  995         nmp = VFSTONFS(mp);
  996         np = VTONFS(dvp);
  997 
  998         /* For NFSv4, wait until any remove is done. */
  999         mtx_lock(&np->n_mtx);
 1000         while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
 1001                 np->n_flag |= NREMOVEWANT;
 1002                 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
 1003         }
 1004         mtx_unlock(&np->n_mtx);
 1005 
 1006         if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
 1007                 return (error);
 1008         error = cache_lookup(dvp, vpp, cnp);
 1009         if (error > 0 && error != ENOENT)
 1010                 return (error);
 1011         if (error == -1) {
 1012                 /*
 1013                  * We only accept a positive hit in the cache if the
 1014                  * change time of the file matches our cached copy.
 1015                  * Otherwise, we discard the cache entry and fallback
 1016                  * to doing a lookup RPC.
 1017                  *
 1018                  * To better handle stale file handles and attributes,
 1019                  * clear the attribute cache of this node if it is a
 1020                  * leaf component, part of an open() call, and not
 1021                  * locally modified before fetching the attributes.
 1022                  * This should allow stale file handles to be detected
 1023                  * here where we can fall back to a LOOKUP RPC to
 1024                  * recover rather than having nfs_open() detect the
 1025                  * stale file handle and failing open(2) with ESTALE.
 1026                  */
 1027                 newvp = *vpp;
 1028                 newnp = VTONFS(newvp);
 1029                 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
 1030                     (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1031                     !(newnp->n_flag & NMODIFIED)) {
 1032                         mtx_lock(&newnp->n_mtx);
 1033                         newnp->n_attrstamp = 0;
 1034                         mtx_unlock(&newnp->n_mtx);
 1035                 }
 1036                 if (nfscl_nodeleg(newvp, 0) == 0 ||
 1037                     (VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
 1038                     timespeccmp(&vattr.va_ctime, &newnp->n_ctime, ==))) {
 1039                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1040                         if (cnp->cn_nameiop != LOOKUP &&
 1041                             (flags & ISLASTCN))
 1042                                 cnp->cn_flags |= SAVENAME;
 1043                         return (0);
 1044                 }
 1045                 cache_purge(newvp);
 1046                 if (dvp != newvp)
 1047                         vput(newvp);
 1048                 else 
 1049                         vrele(newvp);
 1050                 *vpp = NULLVP;
 1051         } else if (error == ENOENT) {
 1052                 if (dvp->v_iflag & VI_DOOMED)
 1053                         return (ENOENT);
 1054                 /*
 1055                  * We only accept a negative hit in the cache if the
 1056                  * modification time of the parent directory matches
 1057                  * our cached copy.  Otherwise, we discard all of the
 1058                  * negative cache entries for this directory. We also
 1059                  * only trust -ve cache entries for less than
 1060                  * nm_negative_namecache_timeout seconds.
 1061                  */
 1062                 if ((u_int)(ticks - np->n_dmtime_ticks) <
 1063                     (nmp->nm_negnametimeo * hz) &&
 1064                     VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
 1065                     timespeccmp(&vattr.va_mtime, &np->n_dmtime, ==)) {
 1066                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1067                         return (ENOENT);
 1068                 }
 1069                 cache_purge_negative(dvp);
 1070                 mtx_lock(&np->n_mtx);
 1071                 timespecclear(&np->n_dmtime);
 1072                 mtx_unlock(&np->n_mtx);
 1073         }
 1074 
 1075         /*
 1076          * Cache the modification time of the parent directory in case
 1077          * the lookup fails and results in adding the first negative
 1078          * name cache entry for the directory.  Since this is reading
 1079          * a single time_t, don't bother with locking.  The
 1080          * modification time may be a bit stale, but it must be read
 1081          * before performing the lookup RPC to prevent a race where
 1082          * another lookup updates the timestamp on the directory after
 1083          * the lookup RPC has been performed on the server but before
 1084          * n_dmtime is set at the end of this function.
 1085          */
 1086         dmtime = np->n_vattr.na_mtime;
 1087         error = 0;
 1088         newvp = NULLVP;
 1089         NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
 1090         error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1091             cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1092             NULL);
 1093         if (dattrflag)
 1094                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1095         if (error) {
 1096                 if (newvp != NULLVP) {
 1097                         vput(newvp);
 1098                         *vpp = NULLVP;
 1099                 }
 1100 
 1101                 if (error != ENOENT) {
 1102                         if (NFS_ISV4(dvp))
 1103                                 error = nfscl_maperr(td, error, (uid_t)0,
 1104                                     (gid_t)0);
 1105                         return (error);
 1106                 }
 1107 
 1108                 /* The requested file was not found. */
 1109                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 1110                     (flags & ISLASTCN)) {
 1111                         /*
 1112                          * XXX: UFS does a full VOP_ACCESS(dvp,
 1113                          * VWRITE) here instead of just checking
 1114                          * MNT_RDONLY.
 1115                          */
 1116                         if (mp->mnt_flag & MNT_RDONLY)
 1117                                 return (EROFS);
 1118                         cnp->cn_flags |= SAVENAME;
 1119                         return (EJUSTRETURN);
 1120                 }
 1121 
 1122                 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) {
 1123                         /*
 1124                          * Maintain n_dmtime as the modification time
 1125                          * of the parent directory when the oldest -ve
 1126                          * name cache entry for this directory was
 1127                          * added.  If a -ve cache entry has already
 1128                          * been added with a newer modification time
 1129                          * by a concurrent lookup, then don't bother
 1130                          * adding a cache entry.  The modification
 1131                          * time of the directory might have changed
 1132                          * due to the file this lookup failed to find
 1133                          * being created.  In that case a subsequent
 1134                          * lookup would incorrectly use the entry
 1135                          * added here instead of doing an extra
 1136                          * lookup.
 1137                          */
 1138                         mtx_lock(&np->n_mtx);
 1139                         if (timespeccmp(&np->n_dmtime, &dmtime, <=)) {
 1140                                 if (!timespecisset(&np->n_dmtime)) {
 1141                                         np->n_dmtime = dmtime;
 1142                                         np->n_dmtime_ticks = ticks;
 1143                                 }
 1144                                 mtx_unlock(&np->n_mtx);
 1145                                 cache_enter(dvp, NULL, cnp);
 1146                         } else
 1147                                 mtx_unlock(&np->n_mtx);
 1148                 }
 1149                 return (ENOENT);
 1150         }
 1151 
 1152         /*
 1153          * Handle RENAME case...
 1154          */
 1155         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 1156                 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1157                         FREE((caddr_t)nfhp, M_NFSFH);
 1158                         return (EISDIR);
 1159                 }
 1160                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1161                     LK_EXCLUSIVE);
 1162                 if (error)
 1163                         return (error);
 1164                 newvp = NFSTOV(np);
 1165                 if (attrflag)
 1166                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1167                             0, 1);
 1168                 *vpp = newvp;
 1169                 cnp->cn_flags |= SAVENAME;
 1170                 return (0);
 1171         }
 1172 
 1173         if (flags & ISDOTDOT) {
 1174                 ltype = NFSVOPISLOCKED(dvp);
 1175                 error = vfs_busy(mp, MBF_NOWAIT);
 1176                 if (error != 0) {
 1177                         vfs_ref(mp);
 1178                         NFSVOPUNLOCK(dvp, 0);
 1179                         error = vfs_busy(mp, 0);
 1180                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1181                         vfs_rel(mp);
 1182                         if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
 1183                                 vfs_unbusy(mp);
 1184                                 error = ENOENT;
 1185                         }
 1186                         if (error != 0)
 1187                                 return (error);
 1188                 }
 1189                 NFSVOPUNLOCK(dvp, 0);
 1190                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1191                     cnp->cn_lkflags);
 1192                 if (error == 0)
 1193                         newvp = NFSTOV(np);
 1194                 vfs_unbusy(mp);
 1195                 if (newvp != dvp)
 1196                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1197                 if (dvp->v_iflag & VI_DOOMED) {
 1198                         if (error == 0) {
 1199                                 if (newvp == dvp)
 1200                                         vrele(newvp);
 1201                                 else
 1202                                         vput(newvp);
 1203                         }
 1204                         error = ENOENT;
 1205                 }
 1206                 if (error != 0)
 1207                         return (error);
 1208                 if (attrflag)
 1209                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1210                             0, 1);
 1211         } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1212                 FREE((caddr_t)nfhp, M_NFSFH);
 1213                 VREF(dvp);
 1214                 newvp = dvp;
 1215                 if (attrflag)
 1216                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1217                             0, 1);
 1218         } else {
 1219                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1220                     cnp->cn_lkflags);
 1221                 if (error)
 1222                         return (error);
 1223                 newvp = NFSTOV(np);
 1224                 if (attrflag)
 1225                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1226                             0, 1);
 1227                 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1228                     !(np->n_flag & NMODIFIED)) {                        
 1229                         /*
 1230                          * Flush the attribute cache when opening a
 1231                          * leaf node to ensure that fresh attributes
 1232                          * are fetched in nfs_open() since we did not
 1233                          * fetch attributes from the LOOKUP reply.
 1234                          */
 1235                         mtx_lock(&np->n_mtx);
 1236                         np->n_attrstamp = 0;
 1237                         mtx_unlock(&np->n_mtx);
 1238                 }
 1239         }
 1240         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1241                 cnp->cn_flags |= SAVENAME;
 1242         if ((cnp->cn_flags & MAKEENTRY) &&
 1243             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
 1244                 np->n_ctime = np->n_vattr.na_vattr.va_ctime;
 1245                 cache_enter(dvp, newvp, cnp);
 1246         }
 1247         *vpp = newvp;
 1248         return (0);
 1249 }
 1250 
 1251 /*
 1252  * nfs read call.
 1253  * Just call ncl_bioread() to do the work.
 1254  */
 1255 static int
 1256 nfs_read(struct vop_read_args *ap)
 1257 {
 1258         struct vnode *vp = ap->a_vp;
 1259 
 1260         switch (vp->v_type) {
 1261         case VREG:
 1262                 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1263         case VDIR:
 1264                 return (EISDIR);
 1265         default:
 1266                 return (EOPNOTSUPP);
 1267         }
 1268 }
 1269 
 1270 /*
 1271  * nfs readlink call
 1272  */
 1273 static int
 1274 nfs_readlink(struct vop_readlink_args *ap)
 1275 {
 1276         struct vnode *vp = ap->a_vp;
 1277 
 1278         if (vp->v_type != VLNK)
 1279                 return (EINVAL);
 1280         return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1281 }
 1282 
 1283 /*
 1284  * Do a readlink rpc.
 1285  * Called by ncl_doio() from below the buffer cache.
 1286  */
 1287 int
 1288 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1289 {
 1290         int error, ret, attrflag;
 1291         struct nfsvattr nfsva;
 1292 
 1293         error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
 1294             &attrflag, NULL);
 1295         if (attrflag) {
 1296                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1297                 if (ret && !error)
 1298                         error = ret;
 1299         }
 1300         if (error && NFS_ISV4(vp))
 1301                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1302         return (error);
 1303 }
 1304 
 1305 /*
 1306  * nfs read rpc call
 1307  * Ditto above
 1308  */
 1309 int
 1310 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1311 {
 1312         int error, ret, attrflag;
 1313         struct nfsvattr nfsva;
 1314 
 1315         error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, &attrflag,
 1316             NULL);
 1317         if (attrflag) {
 1318                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1319                 if (ret && !error)
 1320                         error = ret;
 1321         }
 1322         if (error && NFS_ISV4(vp))
 1323                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1324         return (error);
 1325 }
 1326 
 1327 /*
 1328  * nfs write call
 1329  */
 1330 int
 1331 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1332     int *iomode, int *must_commit, int called_from_strategy)
 1333 {
 1334         struct nfsvattr nfsva;
 1335         int error = 0, attrflag, ret;
 1336 
 1337         error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
 1338             uiop->uio_td, &nfsva, &attrflag, NULL, called_from_strategy);
 1339         if (attrflag) {
 1340                 if (VTONFS(vp)->n_flag & ND_NFSV4)
 1341                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
 1342                             1);
 1343                 else
 1344                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 1345                             1);
 1346                 if (ret && !error)
 1347                         error = ret;
 1348         }
 1349         if (DOINGASYNC(vp))
 1350                 *iomode = NFSWRITE_FILESYNC;
 1351         if (error && NFS_ISV4(vp))
 1352                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1353         return (error);
 1354 }
 1355 
 1356 /*
 1357  * nfs mknod rpc
 1358  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1359  * mode set to specify the file type and the size field for rdev.
 1360  */
 1361 static int
 1362 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1363     struct vattr *vap)
 1364 {
 1365         struct nfsvattr nfsva, dnfsva;
 1366         struct vnode *newvp = NULL;
 1367         struct nfsnode *np = NULL, *dnp;
 1368         struct nfsfh *nfhp;
 1369         struct vattr vattr;
 1370         int error = 0, attrflag, dattrflag;
 1371         u_int32_t rdev;
 1372 
 1373         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1374                 rdev = vap->va_rdev;
 1375         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1376                 rdev = 0xffffffff;
 1377         else
 1378                 return (EOPNOTSUPP);
 1379         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1380                 return (error);
 1381         error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
 1382             rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 1383             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 1384         if (!error) {
 1385                 if (!nfhp)
 1386                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1387                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1388                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1389                             NULL);
 1390                 if (nfhp)
 1391                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1392                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1393         }
 1394         if (dattrflag)
 1395                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1396         if (!error) {
 1397                 newvp = NFSTOV(np);
 1398                 if (attrflag != 0) {
 1399                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1400                             0, 1);
 1401                         if (error != 0)
 1402                                 vput(newvp);
 1403                 }
 1404         }
 1405         if (!error) {
 1406                 if ((cnp->cn_flags & MAKEENTRY))
 1407                         cache_enter(dvp, newvp, cnp);
 1408                 *vpp = newvp;
 1409         } else if (NFS_ISV4(dvp)) {
 1410                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1411                     vap->va_gid);
 1412         }
 1413         dnp = VTONFS(dvp);
 1414         mtx_lock(&dnp->n_mtx);
 1415         dnp->n_flag |= NMODIFIED;
 1416         if (!dattrflag)
 1417                 dnp->n_attrstamp = 0;
 1418         mtx_unlock(&dnp->n_mtx);
 1419         return (error);
 1420 }
 1421 
 1422 /*
 1423  * nfs mknod vop
 1424  * just call nfs_mknodrpc() to do the work.
 1425  */
 1426 /* ARGSUSED */
 1427 static int
 1428 nfs_mknod(struct vop_mknod_args *ap)
 1429 {
 1430         return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
 1431 }
 1432 
 1433 static u_long create_verf;
 1434 /*
 1435  * nfs file create call
 1436  */
 1437 static int
 1438 nfs_create(struct vop_create_args *ap)
 1439 {
 1440         struct vnode *dvp = ap->a_dvp;
 1441         struct vattr *vap = ap->a_vap;
 1442         struct componentname *cnp = ap->a_cnp;
 1443         struct nfsnode *np = NULL, *dnp;
 1444         struct vnode *newvp = NULL;
 1445         struct nfsmount *nmp;
 1446         struct nfsvattr dnfsva, nfsva;
 1447         struct nfsfh *nfhp;
 1448         nfsquad_t cverf;
 1449         int error = 0, attrflag, dattrflag, fmode = 0;
 1450         struct vattr vattr;
 1451 
 1452         /*
 1453          * Oops, not for me..
 1454          */
 1455         if (vap->va_type == VSOCK)
 1456                 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 1457 
 1458         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1459                 return (error);
 1460         if (vap->va_vaflags & VA_EXCLUSIVE)
 1461                 fmode |= O_EXCL;
 1462         dnp = VTONFS(dvp);
 1463         nmp = VFSTONFS(vnode_mount(dvp));
 1464 again:
 1465         /* For NFSv4, wait until any remove is done. */
 1466         mtx_lock(&dnp->n_mtx);
 1467         while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
 1468                 dnp->n_flag |= NREMOVEWANT;
 1469                 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
 1470         }
 1471         mtx_unlock(&dnp->n_mtx);
 1472 
 1473 #ifdef INET
 1474         CURVNET_SET(CRED_TO_VNET(cnp->cn_cred));
 1475         IN_IFADDR_RLOCK();
 1476         if (!TAILQ_EMPTY(&V_in_ifaddrhead))
 1477                 cverf.lval[0] = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr;
 1478         else
 1479 #endif
 1480                 cverf.lval[0] = create_verf;
 1481 #ifdef INET
 1482         IN_IFADDR_RUNLOCK();
 1483         CURVNET_RESTORE();
 1484 #endif
 1485         cverf.lval[1] = ++create_verf;
 1486         error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1487             vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
 1488             &nfhp, &attrflag, &dattrflag, NULL);
 1489         if (!error) {
 1490                 if (nfhp == NULL)
 1491                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1492                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1493                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1494                             NULL);
 1495                 if (nfhp != NULL)
 1496                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1497                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1498         }
 1499         if (dattrflag)
 1500                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1501         if (!error) {
 1502                 newvp = NFSTOV(np);
 1503                 if (attrflag)
 1504                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1505                             0, 1);
 1506         }
 1507         if (error) {
 1508                 if (newvp != NULL) {
 1509                         vput(newvp);
 1510                         newvp = NULL;
 1511                 }
 1512                 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
 1513                     error == NFSERR_NOTSUPP) {
 1514                         fmode &= ~O_EXCL;
 1515                         goto again;
 1516                 }
 1517         } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
 1518                 if (nfscl_checksattr(vap, &nfsva)) {
 1519                         /*
 1520                          * We are normally called with only a partially
 1521                          * initialized VAP. Since the NFSv3 spec says that
 1522                          * the server may use the file attributes to
 1523                          * store the verifier, the spec requires us to do a
 1524                          * SETATTR RPC. FreeBSD servers store the verifier in
 1525                          * atime, but we can't really assume that all servers
 1526                          * will so we ensure that our SETATTR sets both atime
 1527                          * and mtime.
 1528                          */
 1529                         if (vap->va_mtime.tv_sec == VNOVAL)
 1530                                 vfs_timestamp(&vap->va_mtime);
 1531                         if (vap->va_atime.tv_sec == VNOVAL)
 1532                                 vap->va_atime = vap->va_mtime;
 1533                         error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
 1534                             cnp->cn_thread, &nfsva, &attrflag, NULL);
 1535                         if (error && (vap->va_uid != (uid_t)VNOVAL ||
 1536                             vap->va_gid != (gid_t)VNOVAL)) {
 1537                                 /* try again without setting uid/gid */
 1538                                 vap->va_uid = (uid_t)VNOVAL;
 1539                                 vap->va_gid = (uid_t)VNOVAL;
 1540                                 error = nfsrpc_setattr(newvp, vap, NULL, 
 1541                                     cnp->cn_cred, cnp->cn_thread, &nfsva,
 1542                                     &attrflag, NULL);
 1543                         }
 1544                         if (attrflag)
 1545                                 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 1546                                     NULL, 0, 1);
 1547                         if (error != 0)
 1548                                 vput(newvp);
 1549                 }
 1550         }
 1551         if (!error) {
 1552                 if (cnp->cn_flags & MAKEENTRY)
 1553                         cache_enter(dvp, newvp, cnp);
 1554                 *ap->a_vpp = newvp;
 1555         } else if (NFS_ISV4(dvp)) {
 1556                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1557                     vap->va_gid);
 1558         }
 1559         mtx_lock(&dnp->n_mtx);
 1560         dnp->n_flag |= NMODIFIED;
 1561         if (!dattrflag)
 1562                 dnp->n_attrstamp = 0;
 1563         mtx_unlock(&dnp->n_mtx);
 1564         return (error);
 1565 }
 1566 
 1567 /*
 1568  * nfs file remove call
 1569  * To try and make nfs semantics closer to ufs semantics, a file that has
 1570  * other processes using the vnode is renamed instead of removed and then
 1571  * removed later on the last close.
 1572  * - If v_usecount > 1
 1573  *        If a rename is not already in the works
 1574  *           call nfs_sillyrename() to set it up
 1575  *     else
 1576  *        do the remove rpc
 1577  */
 1578 static int
 1579 nfs_remove(struct vop_remove_args *ap)
 1580 {
 1581         struct vnode *vp = ap->a_vp;
 1582         struct vnode *dvp = ap->a_dvp;
 1583         struct componentname *cnp = ap->a_cnp;
 1584         struct nfsnode *np = VTONFS(vp);
 1585         int error = 0;
 1586         struct vattr vattr;
 1587 
 1588         KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
 1589         KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
 1590         if (vp->v_type == VDIR)
 1591                 error = EPERM;
 1592         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1593             VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
 1594             vattr.va_nlink > 1)) {
 1595                 /*
 1596                  * Purge the name cache so that the chance of a lookup for
 1597                  * the name succeeding while the remove is in progress is
 1598                  * minimized. Without node locking it can still happen, such
 1599                  * that an I/O op returns ESTALE, but since you get this if
 1600                  * another host removes the file..
 1601                  */
 1602                 cache_purge(vp);
 1603                 /*
 1604                  * throw away biocache buffers, mainly to avoid
 1605                  * unnecessary delayed writes later.
 1606                  */
 1607                 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1608                 /* Do the rpc */
 1609                 if (error != EINTR && error != EIO)
 1610                         error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
 1611                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1612                 /*
 1613                  * Kludge City: If the first reply to the remove rpc is lost..
 1614                  *   the reply to the retransmitted request will be ENOENT
 1615                  *   since the file was in fact removed
 1616                  *   Therefore, we cheat and return success.
 1617                  */
 1618                 if (error == ENOENT)
 1619                         error = 0;
 1620         } else if (!np->n_sillyrename)
 1621                 error = nfs_sillyrename(dvp, vp, cnp);
 1622         mtx_lock(&np->n_mtx);
 1623         np->n_attrstamp = 0;
 1624         mtx_unlock(&np->n_mtx);
 1625         return (error);
 1626 }
 1627 
 1628 /*
 1629  * nfs file remove rpc called from nfs_inactive
 1630  */
 1631 int
 1632 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
 1633 {
 1634         /*
 1635          * Make sure that the directory vnode is still valid.
 1636          * XXX we should lock sp->s_dvp here.
 1637          */
 1638         if (sp->s_dvp->v_type == VBAD)
 1639                 return (0);
 1640         return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
 1641             sp->s_cred, NULL));
 1642 }
 1643 
 1644 /*
 1645  * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
 1646  */
 1647 static int
 1648 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
 1649     int namelen, struct ucred *cred, struct thread *td)
 1650 {
 1651         struct nfsvattr dnfsva;
 1652         struct nfsnode *dnp = VTONFS(dvp);
 1653         int error = 0, dattrflag;
 1654 
 1655         mtx_lock(&dnp->n_mtx);
 1656         dnp->n_flag |= NREMOVEINPROG;
 1657         mtx_unlock(&dnp->n_mtx);
 1658         error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
 1659             &dattrflag, NULL);
 1660         mtx_lock(&dnp->n_mtx);
 1661         if ((dnp->n_flag & NREMOVEWANT)) {
 1662                 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
 1663                 mtx_unlock(&dnp->n_mtx);
 1664                 wakeup((caddr_t)dnp);
 1665         } else {
 1666                 dnp->n_flag &= ~NREMOVEINPROG;
 1667                 mtx_unlock(&dnp->n_mtx);
 1668         }
 1669         if (dattrflag)
 1670                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1671         mtx_lock(&dnp->n_mtx);
 1672         dnp->n_flag |= NMODIFIED;
 1673         if (!dattrflag)
 1674                 dnp->n_attrstamp = 0;
 1675         mtx_unlock(&dnp->n_mtx);
 1676         if (error && NFS_ISV4(dvp))
 1677                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1678         return (error);
 1679 }
 1680 
 1681 /*
 1682  * nfs file rename call
 1683  */
 1684 static int
 1685 nfs_rename(struct vop_rename_args *ap)
 1686 {
 1687         struct vnode *fvp = ap->a_fvp;
 1688         struct vnode *tvp = ap->a_tvp;
 1689         struct vnode *fdvp = ap->a_fdvp;
 1690         struct vnode *tdvp = ap->a_tdvp;
 1691         struct componentname *tcnp = ap->a_tcnp;
 1692         struct componentname *fcnp = ap->a_fcnp;
 1693         struct nfsnode *fnp = VTONFS(ap->a_fvp);
 1694         struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
 1695         struct nfsv4node *newv4 = NULL;
 1696         int error;
 1697 
 1698         KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
 1699             (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
 1700         /* Check for cross-device rename */
 1701         if ((fvp->v_mount != tdvp->v_mount) ||
 1702             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1703                 error = EXDEV;
 1704                 goto out;
 1705         }
 1706 
 1707         if (fvp == tvp) {
 1708                 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n");
 1709                 error = 0;
 1710                 goto out;
 1711         }
 1712         if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
 1713                 goto out;
 1714 
 1715         /*
 1716          * We have to flush B_DELWRI data prior to renaming
 1717          * the file.  If we don't, the delayed-write buffers
 1718          * can be flushed out later after the file has gone stale
 1719          * under NFSV3.  NFSV2 does not have this problem because
 1720          * ( as far as I can tell ) it flushes dirty buffers more
 1721          * often.
 1722          * 
 1723          * Skip the rename operation if the fsync fails, this can happen
 1724          * due to the server's volume being full, when we pushed out data
 1725          * that was written back to our cache earlier. Not checking for
 1726          * this condition can result in potential (silent) data loss.
 1727          */
 1728         error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1729         NFSVOPUNLOCK(fvp, 0);
 1730         if (!error && tvp)
 1731                 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1732         if (error)
 1733                 goto out;
 1734 
 1735         /*
 1736          * If the tvp exists and is in use, sillyrename it before doing the
 1737          * rename of the new file over it.
 1738          * XXX Can't sillyrename a directory.
 1739          */
 1740         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1741                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1742                 vput(tvp);
 1743                 tvp = NULL;
 1744         }
 1745 
 1746         error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1747             tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1748             tcnp->cn_thread);
 1749 
 1750         if (error == 0 && NFS_ISV4(tdvp)) {
 1751                 /*
 1752                  * For NFSv4, check to see if it is the same name and
 1753                  * replace the name, if it is different.
 1754                  */
 1755                 MALLOC(newv4, struct nfsv4node *,
 1756                     sizeof (struct nfsv4node) +
 1757                     tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
 1758                     M_NFSV4NODE, M_WAITOK);
 1759                 mtx_lock(&tdnp->n_mtx);
 1760                 mtx_lock(&fnp->n_mtx);
 1761                 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
 1762                     (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
 1763                       NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
 1764                       tcnp->cn_namelen) ||
 1765                       tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
 1766                       NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1767                         tdnp->n_fhp->nfh_len))) {
 1768 #ifdef notdef
 1769 { char nnn[100]; int nnnl;
 1770 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
 1771 bcopy(tcnp->cn_nameptr, nnn, nnnl);
 1772 nnn[nnnl] = '\0';
 1773 printf("ren replace=%s\n",nnn);
 1774 }
 1775 #endif
 1776                         FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
 1777                         fnp->n_v4 = newv4;
 1778                         newv4 = NULL;
 1779                         fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
 1780                         fnp->n_v4->n4_namelen = tcnp->cn_namelen;
 1781                         NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1782                             tdnp->n_fhp->nfh_len);
 1783                         NFSBCOPY(tcnp->cn_nameptr,
 1784                             NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
 1785                 }
 1786                 mtx_unlock(&tdnp->n_mtx);
 1787                 mtx_unlock(&fnp->n_mtx);
 1788                 if (newv4 != NULL)
 1789                         FREE((caddr_t)newv4, M_NFSV4NODE);
 1790         }
 1791 
 1792         if (fvp->v_type == VDIR) {
 1793                 if (tvp != NULL && tvp->v_type == VDIR)
 1794                         cache_purge(tdvp);
 1795                 cache_purge(fdvp);
 1796         }
 1797 
 1798 out:
 1799         if (tdvp == tvp)
 1800                 vrele(tdvp);
 1801         else
 1802                 vput(tdvp);
 1803         if (tvp)
 1804                 vput(tvp);
 1805         vrele(fdvp);
 1806         vrele(fvp);
 1807         /*
 1808          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1809          */
 1810         if (error == ENOENT)
 1811                 error = 0;
 1812         return (error);
 1813 }
 1814 
 1815 /*
 1816  * nfs file rename rpc called from nfs_remove() above
 1817  */
 1818 static int
 1819 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
 1820     struct sillyrename *sp)
 1821 {
 1822 
 1823         return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
 1824             sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
 1825             scnp->cn_thread));
 1826 }
 1827 
 1828 /*
 1829  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 1830  */
 1831 static int
 1832 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
 1833     int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
 1834     int tnamelen, struct ucred *cred, struct thread *td)
 1835 {
 1836         struct nfsvattr fnfsva, tnfsva;
 1837         struct nfsnode *fdnp = VTONFS(fdvp);
 1838         struct nfsnode *tdnp = VTONFS(tdvp);
 1839         int error = 0, fattrflag, tattrflag;
 1840 
 1841         error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
 1842             tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
 1843             &tattrflag, NULL, NULL);
 1844         mtx_lock(&fdnp->n_mtx);
 1845         fdnp->n_flag |= NMODIFIED;
 1846         if (fattrflag != 0) {
 1847                 mtx_unlock(&fdnp->n_mtx);
 1848                 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
 1849         } else {
 1850                 fdnp->n_attrstamp = 0;
 1851                 mtx_unlock(&fdnp->n_mtx);
 1852         }
 1853         mtx_lock(&tdnp->n_mtx);
 1854         tdnp->n_flag |= NMODIFIED;
 1855         if (tattrflag != 0) {
 1856                 mtx_unlock(&tdnp->n_mtx);
 1857                 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
 1858         } else {
 1859                 tdnp->n_attrstamp = 0;
 1860                 mtx_unlock(&tdnp->n_mtx);
 1861         }
 1862         if (error && NFS_ISV4(fdvp))
 1863                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1864         return (error);
 1865 }
 1866 
 1867 /*
 1868  * nfs hard link create call
 1869  */
 1870 static int
 1871 nfs_link(struct vop_link_args *ap)
 1872 {
 1873         struct vnode *vp = ap->a_vp;
 1874         struct vnode *tdvp = ap->a_tdvp;
 1875         struct componentname *cnp = ap->a_cnp;
 1876         struct nfsnode *np, *tdnp;
 1877         struct nfsvattr nfsva, dnfsva;
 1878         int error = 0, attrflag, dattrflag;
 1879 
 1880         if (vp->v_mount != tdvp->v_mount) {
 1881                 return (EXDEV);
 1882         }
 1883 
 1884         /*
 1885          * Push all writes to the server, so that the attribute cache
 1886          * doesn't get "out of sync" with the server.
 1887          * XXX There should be a better way!
 1888          */
 1889         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 1890 
 1891         error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
 1892             cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
 1893             &dattrflag, NULL);
 1894         tdnp = VTONFS(tdvp);
 1895         mtx_lock(&tdnp->n_mtx);
 1896         tdnp->n_flag |= NMODIFIED;
 1897         if (dattrflag != 0) {
 1898                 mtx_unlock(&tdnp->n_mtx);
 1899                 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
 1900         } else {
 1901                 tdnp->n_attrstamp = 0;
 1902                 mtx_unlock(&tdnp->n_mtx);
 1903         }
 1904         if (attrflag)
 1905                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1906         else {
 1907                 np = VTONFS(vp);
 1908                 mtx_lock(&np->n_mtx);
 1909                 np->n_attrstamp = 0;
 1910                 mtx_unlock(&np->n_mtx);
 1911         }
 1912         /*
 1913          * If negative lookup caching is enabled, I might as well
 1914          * add an entry for this node. Not necessary for correctness,
 1915          * but if negative caching is enabled, then the system
 1916          * must care about lookup caching hit rate, so...
 1917          */
 1918         if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
 1919             (cnp->cn_flags & MAKEENTRY))
 1920                 cache_enter(tdvp, vp, cnp);
 1921         if (error && NFS_ISV4(vp))
 1922                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 1923                     (gid_t)0);
 1924         return (error);
 1925 }
 1926 
 1927 /*
 1928  * nfs symbolic link create call
 1929  */
 1930 static int
 1931 nfs_symlink(struct vop_symlink_args *ap)
 1932 {
 1933         struct vnode *dvp = ap->a_dvp;
 1934         struct vattr *vap = ap->a_vap;
 1935         struct componentname *cnp = ap->a_cnp;
 1936         struct nfsvattr nfsva, dnfsva;
 1937         struct nfsfh *nfhp;
 1938         struct nfsnode *np = NULL, *dnp;
 1939         struct vnode *newvp = NULL;
 1940         int error = 0, attrflag, dattrflag, ret;
 1941 
 1942         vap->va_type = VLNK;
 1943         error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1944             ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 1945             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 1946         if (nfhp) {
 1947                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 1948                     &np, NULL, LK_EXCLUSIVE);
 1949                 if (!ret)
 1950                         newvp = NFSTOV(np);
 1951                 else if (!error)
 1952                         error = ret;
 1953         }
 1954         if (newvp != NULL) {
 1955                 if (attrflag)
 1956                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1957                             0, 1);
 1958         } else if (!error) {
 1959                 /*
 1960                  * If we do not have an error and we could not extract the
 1961                  * newvp from the response due to the request being NFSv2, we
 1962                  * have to do a lookup in order to obtain a newvp to return.
 1963                  */
 1964                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1965                     cnp->cn_cred, cnp->cn_thread, &np);
 1966                 if (!error)
 1967                         newvp = NFSTOV(np);
 1968         }
 1969         if (error) {
 1970                 if (newvp)
 1971                         vput(newvp);
 1972                 if (NFS_ISV4(dvp))
 1973                         error = nfscl_maperr(cnp->cn_thread, error,
 1974                             vap->va_uid, vap->va_gid);
 1975         } else {
 1976                 /*
 1977                  * If negative lookup caching is enabled, I might as well
 1978                  * add an entry for this node. Not necessary for correctness,
 1979                  * but if negative caching is enabled, then the system
 1980                  * must care about lookup caching hit rate, so...
 1981                  */
 1982                 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 1983                     (cnp->cn_flags & MAKEENTRY))
 1984                         cache_enter(dvp, newvp, cnp);
 1985                 *ap->a_vpp = newvp;
 1986         }
 1987 
 1988         dnp = VTONFS(dvp);
 1989         mtx_lock(&dnp->n_mtx);
 1990         dnp->n_flag |= NMODIFIED;
 1991         if (dattrflag != 0) {
 1992                 mtx_unlock(&dnp->n_mtx);
 1993                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1994         } else {
 1995                 dnp->n_attrstamp = 0;
 1996                 mtx_unlock(&dnp->n_mtx);
 1997         }
 1998         return (error);
 1999 }
 2000 
 2001 /*
 2002  * nfs make dir call
 2003  */
 2004 static int
 2005 nfs_mkdir(struct vop_mkdir_args *ap)
 2006 {
 2007         struct vnode *dvp = ap->a_dvp;
 2008         struct vattr *vap = ap->a_vap;
 2009         struct componentname *cnp = ap->a_cnp;
 2010         struct nfsnode *np = NULL, *dnp;
 2011         struct vnode *newvp = NULL;
 2012         struct vattr vattr;
 2013         struct nfsfh *nfhp;
 2014         struct nfsvattr nfsva, dnfsva;
 2015         int error = 0, attrflag, dattrflag, ret;
 2016 
 2017         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
 2018                 return (error);
 2019         vap->va_type = VDIR;
 2020         error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2021             vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
 2022             &attrflag, &dattrflag, NULL);
 2023         dnp = VTONFS(dvp);
 2024         mtx_lock(&dnp->n_mtx);
 2025         dnp->n_flag |= NMODIFIED;
 2026         if (dattrflag != 0) {
 2027                 mtx_unlock(&dnp->n_mtx);
 2028                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2029         } else {
 2030                 dnp->n_attrstamp = 0;
 2031                 mtx_unlock(&dnp->n_mtx);
 2032         }
 2033         if (nfhp) {
 2034                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2035                     &np, NULL, LK_EXCLUSIVE);
 2036                 if (!ret) {
 2037                         newvp = NFSTOV(np);
 2038                         if (attrflag)
 2039                            (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 2040                                 NULL, 0, 1);
 2041                 } else if (!error)
 2042                         error = ret;
 2043         }
 2044         if (!error && newvp == NULL) {
 2045                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2046                     cnp->cn_cred, cnp->cn_thread, &np);
 2047                 if (!error) {
 2048                         newvp = NFSTOV(np);
 2049                         if (newvp->v_type != VDIR)
 2050                                 error = EEXIST;
 2051                 }
 2052         }
 2053         if (error) {
 2054                 if (newvp)
 2055                         vput(newvp);
 2056                 if (NFS_ISV4(dvp))
 2057                         error = nfscl_maperr(cnp->cn_thread, error,
 2058                             vap->va_uid, vap->va_gid);
 2059         } else {
 2060                 /*
 2061                  * If negative lookup caching is enabled, I might as well
 2062                  * add an entry for this node. Not necessary for correctness,
 2063                  * but if negative caching is enabled, then the system
 2064                  * must care about lookup caching hit rate, so...
 2065                  */
 2066                 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2067                     (cnp->cn_flags & MAKEENTRY))
 2068                         cache_enter(dvp, newvp, cnp);
 2069                 *ap->a_vpp = newvp;
 2070         }
 2071         return (error);
 2072 }
 2073 
 2074 /*
 2075  * nfs remove directory call
 2076  */
 2077 static int
 2078 nfs_rmdir(struct vop_rmdir_args *ap)
 2079 {
 2080         struct vnode *vp = ap->a_vp;
 2081         struct vnode *dvp = ap->a_dvp;
 2082         struct componentname *cnp = ap->a_cnp;
 2083         struct nfsnode *dnp;
 2084         struct nfsvattr dnfsva;
 2085         int error, dattrflag;
 2086 
 2087         if (dvp == vp)
 2088                 return (EINVAL);
 2089         error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2090             cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
 2091         dnp = VTONFS(dvp);
 2092         mtx_lock(&dnp->n_mtx);
 2093         dnp->n_flag |= NMODIFIED;
 2094         if (dattrflag != 0) {
 2095                 mtx_unlock(&dnp->n_mtx);
 2096                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2097         } else {
 2098                 dnp->n_attrstamp = 0;
 2099                 mtx_unlock(&dnp->n_mtx);
 2100         }
 2101 
 2102         cache_purge(dvp);
 2103         cache_purge(vp);
 2104         if (error && NFS_ISV4(dvp))
 2105                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2106                     (gid_t)0);
 2107         /*
 2108          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 2109          */
 2110         if (error == ENOENT)
 2111                 error = 0;
 2112         return (error);
 2113 }
 2114 
 2115 /*
 2116  * nfs readdir call
 2117  */
 2118 static int
 2119 nfs_readdir(struct vop_readdir_args *ap)
 2120 {
 2121         struct vnode *vp = ap->a_vp;
 2122         struct nfsnode *np = VTONFS(vp);
 2123         struct uio *uio = ap->a_uio;
 2124         int tresid, error = 0;
 2125         struct vattr vattr;
 2126         
 2127         if (vp->v_type != VDIR) 
 2128                 return(EPERM);
 2129 
 2130         /*
 2131          * First, check for hit on the EOF offset cache
 2132          */
 2133         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 2134             (np->n_flag & NMODIFIED) == 0) {
 2135                 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
 2136                         mtx_lock(&np->n_mtx);
 2137                         if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
 2138                             !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 2139                                 mtx_unlock(&np->n_mtx);
 2140                                 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
 2141                                 return (0);
 2142                         } else
 2143                                 mtx_unlock(&np->n_mtx);
 2144                 }
 2145         }
 2146 
 2147         /*
 2148          * Call ncl_bioread() to do the real work.
 2149          */
 2150         tresid = uio->uio_resid;
 2151         error = ncl_bioread(vp, uio, 0, ap->a_cred);
 2152 
 2153         if (!error && uio->uio_resid == tresid)
 2154                 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
 2155         return (error);
 2156 }
 2157 
 2158 /*
 2159  * Readdir rpc call.
 2160  * Called from below the buffer cache by ncl_doio().
 2161  */
 2162 int
 2163 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2164     struct thread *td)
 2165 {
 2166         struct nfsvattr nfsva;
 2167         nfsuint64 *cookiep, cookie;
 2168         struct nfsnode *dnp = VTONFS(vp);
 2169         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2170         int error = 0, eof, attrflag;
 2171 
 2172         KASSERT(uiop->uio_iovcnt == 1 &&
 2173             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2174             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2175             ("nfs readdirrpc bad uio"));
 2176 
 2177         /*
 2178          * If there is no cookie, assume directory was stale.
 2179          */
 2180         ncl_dircookie_lock(dnp);
 2181         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2182         if (cookiep) {
 2183                 cookie = *cookiep;
 2184                 ncl_dircookie_unlock(dnp);
 2185         } else {
 2186                 ncl_dircookie_unlock(dnp);              
 2187                 return (NFSERR_BAD_COOKIE);
 2188         }
 2189 
 2190         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2191                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2192 
 2193         error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
 2194             &attrflag, &eof, NULL);
 2195         if (attrflag)
 2196                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2197 
 2198         if (!error) {
 2199                 /*
 2200                  * We are now either at the end of the directory or have filled
 2201                  * the block.
 2202                  */
 2203                 if (eof)
 2204                         dnp->n_direofoffset = uiop->uio_offset;
 2205                 else {
 2206                         if (uiop->uio_resid > 0)
 2207                                 ncl_printf("EEK! readdirrpc resid > 0\n");
 2208                         ncl_dircookie_lock(dnp);
 2209                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2210                         *cookiep = cookie;
 2211                         ncl_dircookie_unlock(dnp);
 2212                 }
 2213         } else if (NFS_ISV4(vp)) {
 2214                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2215         }
 2216         return (error);
 2217 }
 2218 
 2219 /*
 2220  * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
 2221  */
 2222 int
 2223 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2224     struct thread *td)
 2225 {
 2226         struct nfsvattr nfsva;
 2227         nfsuint64 *cookiep, cookie;
 2228         struct nfsnode *dnp = VTONFS(vp);
 2229         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2230         int error = 0, attrflag, eof;
 2231 
 2232         KASSERT(uiop->uio_iovcnt == 1 &&
 2233             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2234             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2235             ("nfs readdirplusrpc bad uio"));
 2236 
 2237         /*
 2238          * If there is no cookie, assume directory was stale.
 2239          */
 2240         ncl_dircookie_lock(dnp);
 2241         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2242         if (cookiep) {
 2243                 cookie = *cookiep;
 2244                 ncl_dircookie_unlock(dnp);
 2245         } else {
 2246                 ncl_dircookie_unlock(dnp);
 2247                 return (NFSERR_BAD_COOKIE);
 2248         }
 2249 
 2250         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2251                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2252         error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
 2253             &attrflag, &eof, NULL);
 2254         if (attrflag)
 2255                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2256 
 2257         if (!error) {
 2258                 /*
 2259                  * We are now either at end of the directory or have filled the
 2260                  * the block.
 2261                  */
 2262                 if (eof)
 2263                         dnp->n_direofoffset = uiop->uio_offset;
 2264                 else {
 2265                         if (uiop->uio_resid > 0)
 2266                                 ncl_printf("EEK! readdirplusrpc resid > 0\n");
 2267                         ncl_dircookie_lock(dnp);
 2268                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2269                         *cookiep = cookie;
 2270                         ncl_dircookie_unlock(dnp);
 2271                 }
 2272         } else if (NFS_ISV4(vp)) {
 2273                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2274         }
 2275         return (error);
 2276 }
 2277 
 2278 /*
 2279  * Silly rename. To make the NFS filesystem that is stateless look a little
 2280  * more like the "ufs" a remove of an active vnode is translated to a rename
 2281  * to a funny looking filename that is removed by nfs_inactive on the
 2282  * nfsnode. There is the potential for another process on a different client
 2283  * to create the same funny name between the nfs_lookitup() fails and the
 2284  * nfs_rename() completes, but...
 2285  */
 2286 static int
 2287 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2288 {
 2289         struct sillyrename *sp;
 2290         struct nfsnode *np;
 2291         int error;
 2292         short pid;
 2293         unsigned int lticks;
 2294 
 2295         cache_purge(dvp);
 2296         np = VTONFS(vp);
 2297         KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
 2298         MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
 2299             M_NEWNFSREQ, M_WAITOK);
 2300         sp->s_cred = crhold(cnp->cn_cred);
 2301         sp->s_dvp = dvp;
 2302         VREF(dvp);
 2303 
 2304         /* 
 2305          * Fudge together a funny name.
 2306          * Changing the format of the funny name to accomodate more 
 2307          * sillynames per directory.
 2308          * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 
 2309          * CPU ticks since boot.
 2310          */
 2311         pid = cnp->cn_thread->td_proc->p_pid;
 2312         lticks = (unsigned int)ticks;
 2313         for ( ; ; ) {
 2314                 sp->s_namlen = sprintf(sp->s_name, 
 2315                                        ".nfs.%08x.%04x4.4", lticks, 
 2316                                        pid);
 2317                 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2318                                  cnp->cn_thread, NULL))
 2319                         break;
 2320                 lticks++;
 2321         }
 2322         error = nfs_renameit(dvp, vp, cnp, sp);
 2323         if (error)
 2324                 goto bad;
 2325         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2326                 cnp->cn_thread, &np);
 2327         np->n_sillyrename = sp;
 2328         return (0);
 2329 bad:
 2330         vrele(sp->s_dvp);
 2331         crfree(sp->s_cred);
 2332         free((caddr_t)sp, M_NEWNFSREQ);
 2333         return (error);
 2334 }
 2335 
 2336 /*
 2337  * Look up a file name and optionally either update the file handle or
 2338  * allocate an nfsnode, depending on the value of npp.
 2339  * npp == NULL  --> just do the lookup
 2340  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2341  *                      handled too
 2342  * *npp != NULL --> update the file handle in the vnode
 2343  */
 2344 static int
 2345 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
 2346     struct thread *td, struct nfsnode **npp)
 2347 {
 2348         struct vnode *newvp = NULL, *vp;
 2349         struct nfsnode *np, *dnp = VTONFS(dvp);
 2350         struct nfsfh *nfhp, *onfhp;
 2351         struct nfsvattr nfsva, dnfsva;
 2352         struct componentname cn;
 2353         int error = 0, attrflag, dattrflag;
 2354         u_int hash;
 2355 
 2356         error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
 2357             &nfhp, &attrflag, &dattrflag, NULL);
 2358         if (dattrflag)
 2359                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2360         if (npp && !error) {
 2361                 if (*npp != NULL) {
 2362                     np = *npp;
 2363                     vp = NFSTOV(np);
 2364                     /*
 2365                      * For NFSv4, check to see if it is the same name and
 2366                      * replace the name, if it is different.
 2367                      */
 2368                     if (np->n_v4 != NULL && nfsva.na_type == VREG &&
 2369                         (np->n_v4->n4_namelen != len ||
 2370                          NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
 2371                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
 2372                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2373                          dnp->n_fhp->nfh_len))) {
 2374 #ifdef notdef
 2375 { char nnn[100]; int nnnl;
 2376 nnnl = (len < 100) ? len : 99;
 2377 bcopy(name, nnn, nnnl);
 2378 nnn[nnnl] = '\0';
 2379 printf("replace=%s\n",nnn);
 2380 }
 2381 #endif
 2382                             FREE((caddr_t)np->n_v4, M_NFSV4NODE);
 2383                             MALLOC(np->n_v4, struct nfsv4node *,
 2384                                 sizeof (struct nfsv4node) +
 2385                                 dnp->n_fhp->nfh_len + len - 1,
 2386                                 M_NFSV4NODE, M_WAITOK);
 2387                             np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
 2388                             np->n_v4->n4_namelen = len;
 2389                             NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2390                                 dnp->n_fhp->nfh_len);
 2391                             NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
 2392                     }
 2393                     hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
 2394                         FNV1_32_INIT);
 2395                     onfhp = np->n_fhp;
 2396                     /*
 2397                      * Rehash node for new file handle.
 2398                      */
 2399                     vfs_hash_rehash(vp, hash);
 2400                     np->n_fhp = nfhp;
 2401                     if (onfhp != NULL)
 2402                         FREE((caddr_t)onfhp, M_NFSFH);
 2403                     newvp = NFSTOV(np);
 2404                 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
 2405                     FREE((caddr_t)nfhp, M_NFSFH);
 2406                     VREF(dvp);
 2407                     newvp = dvp;
 2408                 } else {
 2409                     cn.cn_nameptr = name;
 2410                     cn.cn_namelen = len;
 2411                     error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
 2412                         &np, NULL, LK_EXCLUSIVE);
 2413                     if (error)
 2414                         return (error);
 2415                     newvp = NFSTOV(np);
 2416                 }
 2417                 if (!attrflag && *npp == NULL) {
 2418                         if (newvp == dvp)
 2419                                 vrele(newvp);
 2420                         else
 2421                                 vput(newvp);
 2422                         return (ENOENT);
 2423                 }
 2424                 if (attrflag)
 2425                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2426                             0, 1);
 2427         }
 2428         if (npp && *npp == NULL) {
 2429                 if (error) {
 2430                         if (newvp) {
 2431                                 if (newvp == dvp)
 2432                                         vrele(newvp);
 2433                                 else
 2434                                         vput(newvp);
 2435                         }
 2436                 } else
 2437                         *npp = np;
 2438         }
 2439         if (error && NFS_ISV4(dvp))
 2440                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2441         return (error);
 2442 }
 2443 
 2444 /*
 2445  * Nfs Version 3 and 4 commit rpc
 2446  */
 2447 int
 2448 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2449    struct thread *td)
 2450 {
 2451         struct nfsvattr nfsva;
 2452         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2453         int error, attrflag;
 2454         u_char verf[NFSX_VERF];
 2455 
 2456         mtx_lock(&nmp->nm_mtx);
 2457         if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
 2458                 mtx_unlock(&nmp->nm_mtx);
 2459                 return (0);
 2460         }
 2461         mtx_unlock(&nmp->nm_mtx);
 2462         error = nfsrpc_commit(vp, offset, cnt, cred, td, verf, &nfsva,
 2463             &attrflag, NULL);
 2464         if (!error) {
 2465                 mtx_lock(&nmp->nm_mtx);
 2466                 if (NFSBCMP((caddr_t)nmp->nm_verf, verf, NFSX_VERF)) {
 2467                         NFSBCOPY(verf, (caddr_t)nmp->nm_verf, NFSX_VERF);
 2468                         error = NFSERR_STALEWRITEVERF;
 2469                 }
 2470                 mtx_unlock(&nmp->nm_mtx);
 2471                 if (!error && attrflag)
 2472                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
 2473                             0, 1);
 2474         } else if (NFS_ISV4(vp)) {
 2475                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2476         }
 2477         return (error);
 2478 }
 2479 
 2480 /*
 2481  * Strategy routine.
 2482  * For async requests when nfsiod(s) are running, queue the request by
 2483  * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
 2484  * request.
 2485  */
 2486 static int
 2487 nfs_strategy(struct vop_strategy_args *ap)
 2488 {
 2489         struct buf *bp = ap->a_bp;
 2490         struct ucred *cr;
 2491 
 2492         KASSERT(!(bp->b_flags & B_DONE),
 2493             ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2494         BUF_ASSERT_HELD(bp);
 2495 
 2496         if (bp->b_iocmd == BIO_READ)
 2497                 cr = bp->b_rcred;
 2498         else
 2499                 cr = bp->b_wcred;
 2500 
 2501         /*
 2502          * If the op is asynchronous and an i/o daemon is waiting
 2503          * queue the request, wake it up and wait for completion
 2504          * otherwise just do it ourselves.
 2505          */
 2506         if ((bp->b_flags & B_ASYNC) == 0 ||
 2507             ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
 2508                 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
 2509         return (0);
 2510 }
 2511 
 2512 /*
 2513  * fsync vnode op. Just call ncl_flush() with commit == 1.
 2514  */
 2515 /* ARGSUSED */
 2516 static int
 2517 nfs_fsync(struct vop_fsync_args *ap)
 2518 {
 2519 
 2520         if (ap->a_vp->v_type != VREG) {
 2521                 /*
 2522                  * For NFS, metadata is changed synchronously on the server,
 2523                  * so there is nothing to flush. Also, ncl_flush() clears
 2524                  * the NMODIFIED flag and that shouldn't be done here for
 2525                  * directories.
 2526                  */
 2527                 return (0);
 2528         }
 2529         return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0));
 2530 }
 2531 
 2532 /*
 2533  * Flush all the blocks associated with a vnode.
 2534  *      Walk through the buffer pool and push any dirty pages
 2535  *      associated with the vnode.
 2536  * If the called_from_renewthread argument is TRUE, it has been called
 2537  * from the NFSv4 renew thread and, as such, cannot block indefinitely
 2538  * waiting for a buffer write to complete.
 2539  */
 2540 int
 2541 ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td,
 2542     int commit, int called_from_renewthread)
 2543 {
 2544         struct nfsnode *np = VTONFS(vp);
 2545         struct buf *bp;
 2546         int i;
 2547         struct buf *nbp;
 2548         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2549         int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2550         int passone = 1, trycnt = 0;
 2551         u_quad_t off, endoff, toff;
 2552         struct ucred* wcred = NULL;
 2553         struct buf **bvec = NULL;
 2554         struct bufobj *bo;
 2555 #ifndef NFS_COMMITBVECSIZ
 2556 #define NFS_COMMITBVECSIZ       20
 2557 #endif
 2558         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2559         int bvecsize = 0, bveccount;
 2560 
 2561         if (called_from_renewthread != 0)
 2562                 slptimeo = hz;
 2563         if (nmp->nm_flag & NFSMNT_INT)
 2564                 slpflag = NFS_PCATCH;
 2565         if (!commit)
 2566                 passone = 0;
 2567         bo = &vp->v_bufobj;
 2568         /*
 2569          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2570          * server, but has not been committed to stable storage on the server
 2571          * yet. On the first pass, the byte range is worked out and the commit
 2572          * rpc is done. On the second pass, ncl_writebp() is called to do the
 2573          * job.
 2574          */
 2575 again:
 2576         off = (u_quad_t)-1;
 2577         endoff = 0;
 2578         bvecpos = 0;
 2579         if (NFS_ISV34(vp) && commit) {
 2580                 if (bvec != NULL && bvec != bvec_on_stack)
 2581                         free(bvec, M_TEMP);
 2582                 /*
 2583                  * Count up how many buffers waiting for a commit.
 2584                  */
 2585                 bveccount = 0;
 2586                 BO_LOCK(bo);
 2587                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2588                         if (!BUF_ISLOCKED(bp) &&
 2589                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2590                                 == (B_DELWRI | B_NEEDCOMMIT))
 2591                                 bveccount++;
 2592                 }
 2593                 /*
 2594                  * Allocate space to remember the list of bufs to commit.  It is
 2595                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 2596                  * If we can't get memory (for whatever reason), we will end up
 2597                  * committing the buffers one-by-one in the loop below.
 2598                  */
 2599                 if (bveccount > NFS_COMMITBVECSIZ) {
 2600                         /*
 2601                          * Release the vnode interlock to avoid a lock
 2602                          * order reversal.
 2603                          */
 2604                         BO_UNLOCK(bo);
 2605                         bvec = (struct buf **)
 2606                                 malloc(bveccount * sizeof(struct buf *),
 2607                                        M_TEMP, M_NOWAIT);
 2608                         BO_LOCK(bo);
 2609                         if (bvec == NULL) {
 2610                                 bvec = bvec_on_stack;
 2611                                 bvecsize = NFS_COMMITBVECSIZ;
 2612                         } else
 2613                                 bvecsize = bveccount;
 2614                 } else {
 2615                         bvec = bvec_on_stack;
 2616                         bvecsize = NFS_COMMITBVECSIZ;
 2617                 }
 2618                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2619                         if (bvecpos >= bvecsize)
 2620                                 break;
 2621                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2622                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2623                                 continue;
 2624                         }
 2625                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2626                             (B_DELWRI | B_NEEDCOMMIT)) {
 2627                                 BUF_UNLOCK(bp);
 2628                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2629                                 continue;
 2630                         }
 2631                         BO_UNLOCK(bo);
 2632                         bremfree(bp);
 2633                         /*
 2634                          * Work out if all buffers are using the same cred
 2635                          * so we can deal with them all with one commit.
 2636                          *
 2637                          * NOTE: we are not clearing B_DONE here, so we have
 2638                          * to do it later on in this routine if we intend to
 2639                          * initiate I/O on the bp.
 2640                          *
 2641                          * Note: to avoid loopback deadlocks, we do not
 2642                          * assign b_runningbufspace.
 2643                          */
 2644                         if (wcred == NULL)
 2645                                 wcred = bp->b_wcred;
 2646                         else if (wcred != bp->b_wcred)
 2647                                 wcred = NOCRED;
 2648                         vfs_busy_pages(bp, 1);
 2649 
 2650                         BO_LOCK(bo);
 2651                         /*
 2652                          * bp is protected by being locked, but nbp is not
 2653                          * and vfs_busy_pages() may sleep.  We have to
 2654                          * recalculate nbp.
 2655                          */
 2656                         nbp = TAILQ_NEXT(bp, b_bobufs);
 2657 
 2658                         /*
 2659                          * A list of these buffers is kept so that the
 2660                          * second loop knows which buffers have actually
 2661                          * been committed. This is necessary, since there
 2662                          * may be a race between the commit rpc and new
 2663                          * uncommitted writes on the file.
 2664                          */
 2665                         bvec[bvecpos++] = bp;
 2666                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2667                                 bp->b_dirtyoff;
 2668                         if (toff < off)
 2669                                 off = toff;
 2670                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2671                         if (toff > endoff)
 2672                                 endoff = toff;
 2673                 }
 2674                 BO_UNLOCK(bo);
 2675         }
 2676         if (bvecpos > 0) {
 2677                 /*
 2678                  * Commit data on the server, as required.
 2679                  * If all bufs are using the same wcred, then use that with
 2680                  * one call for all of them, otherwise commit each one
 2681                  * separately.
 2682                  */
 2683                 if (wcred != NOCRED)
 2684                         retv = ncl_commit(vp, off, (int)(endoff - off),
 2685                                           wcred, td);
 2686                 else {
 2687                         retv = 0;
 2688                         for (i = 0; i < bvecpos; i++) {
 2689                                 off_t off, size;
 2690                                 bp = bvec[i];
 2691                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2692                                         bp->b_dirtyoff;
 2693                                 size = (u_quad_t)(bp->b_dirtyend
 2694                                                   - bp->b_dirtyoff);
 2695                                 retv = ncl_commit(vp, off, (int)size,
 2696                                                   bp->b_wcred, td);
 2697                                 if (retv) break;
 2698                         }
 2699                 }
 2700 
 2701                 if (retv == NFSERR_STALEWRITEVERF)
 2702                         ncl_clearcommit(vp->v_mount);
 2703 
 2704                 /*
 2705                  * Now, either mark the blocks I/O done or mark the
 2706                  * blocks dirty, depending on whether the commit
 2707                  * succeeded.
 2708                  */
 2709                 for (i = 0; i < bvecpos; i++) {
 2710                         bp = bvec[i];
 2711                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 2712                         if (retv) {
 2713                                 /*
 2714                                  * Error, leave B_DELWRI intact
 2715                                  */
 2716                                 vfs_unbusy_pages(bp);
 2717                                 brelse(bp);
 2718                         } else {
 2719                                 /*
 2720                                  * Success, remove B_DELWRI ( bundirty() ).
 2721                                  *
 2722                                  * b_dirtyoff/b_dirtyend seem to be NFS
 2723                                  * specific.  We should probably move that
 2724                                  * into bundirty(). XXX
 2725                                  */
 2726                                 bufobj_wref(bo);
 2727                                 bp->b_flags |= B_ASYNC;
 2728                                 bundirty(bp);
 2729                                 bp->b_flags &= ~B_DONE;
 2730                                 bp->b_ioflags &= ~BIO_ERROR;
 2731                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2732                                 bufdone(bp);
 2733                         }
 2734                 }
 2735         }
 2736 
 2737         /*
 2738          * Start/do any write(s) that are required.
 2739          */
 2740 loop:
 2741         BO_LOCK(bo);
 2742         TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2743                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2744                         if (waitfor != MNT_WAIT || passone)
 2745                                 continue;
 2746 
 2747                         error = BUF_TIMELOCK(bp,
 2748                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 2749                             BO_MTX(bo), "nfsfsync", slpflag, slptimeo);
 2750                         if (error == 0) {
 2751                                 BUF_UNLOCK(bp);
 2752                                 goto loop;
 2753                         }
 2754                         if (error == ENOLCK) {
 2755                                 error = 0;
 2756                                 goto loop;
 2757                         }
 2758                         if (called_from_renewthread != 0) {
 2759                                 /*
 2760                                  * Return EIO so the flush will be retried
 2761                                  * later.
 2762                                  */
 2763                                 error = EIO;
 2764                                 goto done;
 2765                         }
 2766                         if (newnfs_sigintr(nmp, td)) {
 2767                                 error = EINTR;
 2768                                 goto done;
 2769                         }
 2770                         if (slpflag & PCATCH) {
 2771                                 slpflag = 0;
 2772                                 slptimeo = 2 * hz;
 2773                         }
 2774                         goto loop;
 2775                 }
 2776                 if ((bp->b_flags & B_DELWRI) == 0)
 2777                         panic("nfs_fsync: not dirty");
 2778                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 2779                         BUF_UNLOCK(bp);
 2780                         continue;
 2781                 }
 2782                 BO_UNLOCK(bo);
 2783                 bremfree(bp);
 2784                 if (passone || !commit)
 2785                     bp->b_flags |= B_ASYNC;
 2786                 else
 2787                     bp->b_flags |= B_ASYNC;
 2788                 bwrite(bp);
 2789                 if (newnfs_sigintr(nmp, td)) {
 2790                         error = EINTR;
 2791                         goto done;
 2792                 }
 2793                 goto loop;
 2794         }
 2795         if (passone) {
 2796                 passone = 0;
 2797                 BO_UNLOCK(bo);
 2798                 goto again;
 2799         }
 2800         if (waitfor == MNT_WAIT) {
 2801                 while (bo->bo_numoutput) {
 2802                         error = bufobj_wwait(bo, slpflag, slptimeo);
 2803                         if (error) {
 2804                             BO_UNLOCK(bo);
 2805                             if (called_from_renewthread != 0) {
 2806                                 /*
 2807                                  * Return EIO so that the flush will be
 2808                                  * retried later.
 2809                                  */
 2810                                 error = EIO;
 2811                                 goto done;
 2812                             }
 2813                             error = newnfs_sigintr(nmp, td);
 2814                             if (error)
 2815                                 goto done;
 2816                             if (slpflag & PCATCH) {
 2817                                 slpflag = 0;
 2818                                 slptimeo = 2 * hz;
 2819                             }
 2820                             BO_LOCK(bo);
 2821                         }
 2822                 }
 2823                 if (bo->bo_dirty.bv_cnt != 0 && commit) {
 2824                         BO_UNLOCK(bo);
 2825                         goto loop;
 2826                 }
 2827                 /*
 2828                  * Wait for all the async IO requests to drain
 2829                  */
 2830                 BO_UNLOCK(bo);
 2831                 mtx_lock(&np->n_mtx);
 2832                 while (np->n_directio_asyncwr > 0) {
 2833                         np->n_flag |= NFSYNCWAIT;
 2834                         error = newnfs_msleep(td, &np->n_directio_asyncwr,
 2835                             &np->n_mtx, slpflag | (PRIBIO + 1), 
 2836                             "nfsfsync", 0);
 2837                         if (error) {
 2838                                 if (newnfs_sigintr(nmp, td)) {
 2839                                         mtx_unlock(&np->n_mtx);
 2840                                         error = EINTR;  
 2841                                         goto done;
 2842                                 }
 2843                         }
 2844                 }
 2845                 mtx_unlock(&np->n_mtx);
 2846         } else
 2847                 BO_UNLOCK(bo);
 2848         mtx_lock(&np->n_mtx);
 2849         if (np->n_flag & NWRITEERR) {
 2850                 error = np->n_error;
 2851                 np->n_flag &= ~NWRITEERR;
 2852         }
 2853         if (commit && bo->bo_dirty.bv_cnt == 0 &&
 2854             bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
 2855                 np->n_flag &= ~NMODIFIED;
 2856         mtx_unlock(&np->n_mtx);
 2857 done:
 2858         if (bvec != NULL && bvec != bvec_on_stack)
 2859                 free(bvec, M_TEMP);
 2860         if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
 2861             (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
 2862              np->n_directio_asyncwr != 0) && trycnt++ < 5) {
 2863                 /* try, try again... */
 2864                 passone = 1;
 2865                 wcred = NULL;
 2866                 bvec = NULL;
 2867                 bvecsize = 0;
 2868 printf("try%d\n", trycnt);
 2869                 goto again;
 2870         }
 2871         return (error);
 2872 }
 2873 
 2874 /*
 2875  * NFS advisory byte-level locks.
 2876  */
 2877 static int
 2878 nfs_advlock(struct vop_advlock_args *ap)
 2879 {
 2880         struct vnode *vp = ap->a_vp;
 2881         struct ucred *cred;
 2882         struct nfsnode *np = VTONFS(ap->a_vp);
 2883         struct proc *p = (struct proc *)ap->a_id;
 2884         struct thread *td = curthread;  /* XXX */
 2885         struct vattr va;
 2886         int ret, error = EOPNOTSUPP;
 2887         u_quad_t size;
 2888         
 2889         if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
 2890                 if (vp->v_type != VREG)
 2891                         return (EINVAL);
 2892                 if ((ap->a_flags & F_POSIX) != 0)
 2893                         cred = p->p_ucred;
 2894                 else
 2895                         cred = td->td_ucred;
 2896                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 2897                 if (vp->v_iflag & VI_DOOMED) {
 2898                         NFSVOPUNLOCK(vp, 0);
 2899                         return (EBADF);
 2900                 }
 2901 
 2902                 /*
 2903                  * If this is unlocking a write locked region, flush and
 2904                  * commit them before unlocking. This is required by
 2905                  * RFC3530 Sec. 9.3.2.
 2906                  */
 2907                 if (ap->a_op == F_UNLCK &&
 2908                     nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
 2909                     ap->a_flags))
 2910                         (void) ncl_flush(vp, MNT_WAIT, cred, td, 1, 0);
 2911 
 2912                 /*
 2913                  * Loop around doing the lock op, while a blocking lock
 2914                  * must wait for the lock op to succeed.
 2915                  */
 2916                 do {
 2917                         ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
 2918                             ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
 2919                         if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 2920                             ap->a_op == F_SETLK) {
 2921                                 NFSVOPUNLOCK(vp, 0);
 2922                                 error = nfs_catnap(PZERO | PCATCH, ret,
 2923                                     "ncladvl");
 2924                                 if (error)
 2925                                         return (EINTR);
 2926                                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 2927                                 if (vp->v_iflag & VI_DOOMED) {
 2928                                         NFSVOPUNLOCK(vp, 0);
 2929                                         return (EBADF);
 2930                                 }
 2931                         }
 2932                 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 2933                      ap->a_op == F_SETLK);
 2934                 if (ret == NFSERR_DENIED) {
 2935                         NFSVOPUNLOCK(vp, 0);
 2936                         return (EAGAIN);
 2937                 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
 2938                         NFSVOPUNLOCK(vp, 0);
 2939                         return (ret);
 2940                 } else if (ret != 0) {
 2941                         NFSVOPUNLOCK(vp, 0);
 2942                         return (EACCES);
 2943                 }
 2944 
 2945                 /*
 2946                  * Now, if we just got a lock, invalidate data in the buffer
 2947                  * cache, as required, so that the coherency conforms with
 2948                  * RFC3530 Sec. 9.3.2.
 2949                  */
 2950                 if (ap->a_op == F_SETLK) {
 2951                         if ((np->n_flag & NMODIFIED) == 0) {
 2952                                 np->n_attrstamp = 0;
 2953                                 ret = VOP_GETATTR(vp, &va, cred);
 2954                         }
 2955                         if ((np->n_flag & NMODIFIED) || ret ||
 2956                             np->n_change != va.va_filerev) {
 2957                                 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
 2958                                 np->n_attrstamp = 0;
 2959                                 ret = VOP_GETATTR(vp, &va, cred);
 2960                                 if (!ret) {
 2961                                         np->n_mtime = va.va_mtime;
 2962                                         np->n_change = va.va_filerev;
 2963                                 }
 2964                         }
 2965                 }
 2966                 NFSVOPUNLOCK(vp, 0);
 2967                 return (0);
 2968         } else if (!NFS_ISV4(vp)) {
 2969                 error = NFSVOPLOCK(vp, LK_SHARED);
 2970                 if (error)
 2971                         return (error);
 2972                 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 2973                         size = VTONFS(vp)->n_size;
 2974                         NFSVOPUNLOCK(vp, 0);
 2975                         error = lf_advlock(ap, &(vp->v_lockf), size);
 2976                 } else {
 2977                         if (nfs_advlock_p != NULL)
 2978                                 error = nfs_advlock_p(ap);
 2979                         else {
 2980                                 NFSVOPUNLOCK(vp, 0);
 2981                                 error = ENOLCK;
 2982                         }
 2983                 }
 2984         }
 2985         return (error);
 2986 }
 2987 
 2988 /*
 2989  * NFS advisory byte-level locks.
 2990  */
 2991 static int
 2992 nfs_advlockasync(struct vop_advlockasync_args *ap)
 2993 {
 2994         struct vnode *vp = ap->a_vp;
 2995         u_quad_t size;
 2996         int error;
 2997         
 2998         if (NFS_ISV4(vp))
 2999                 return (EOPNOTSUPP);
 3000         error = NFSVOPLOCK(vp, LK_SHARED);
 3001         if (error)
 3002                 return (error);
 3003         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3004                 size = VTONFS(vp)->n_size;
 3005                 NFSVOPUNLOCK(vp, 0);
 3006                 error = lf_advlockasync(ap, &(vp->v_lockf), size);
 3007         } else {
 3008                 NFSVOPUNLOCK(vp, 0);
 3009                 error = EOPNOTSUPP;
 3010         }
 3011         return (error);
 3012 }
 3013 
 3014 /*
 3015  * Print out the contents of an nfsnode.
 3016  */
 3017 static int
 3018 nfs_print(struct vop_print_args *ap)
 3019 {
 3020         struct vnode *vp = ap->a_vp;
 3021         struct nfsnode *np = VTONFS(vp);
 3022 
 3023         ncl_printf("\tfileid %ld fsid 0x%x",
 3024            np->n_vattr.na_fileid, np->n_vattr.na_fsid);
 3025         if (vp->v_type == VFIFO)
 3026                 fifo_printinfo(vp);
 3027         printf("\n");
 3028         return (0);
 3029 }
 3030 
 3031 /*
 3032  * This is the "real" nfs::bwrite(struct buf*).
 3033  * We set B_CACHE if this is a VMIO buffer.
 3034  */
 3035 int
 3036 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
 3037 {
 3038         int s;
 3039         int oldflags = bp->b_flags;
 3040 #if 0
 3041         int retv = 1;
 3042         off_t off;
 3043 #endif
 3044 
 3045         BUF_ASSERT_HELD(bp);
 3046 
 3047         if (bp->b_flags & B_INVAL) {
 3048                 brelse(bp);
 3049                 return(0);
 3050         }
 3051 
 3052         bp->b_flags |= B_CACHE;
 3053 
 3054         /*
 3055          * Undirty the bp.  We will redirty it later if the I/O fails.
 3056          */
 3057 
 3058         s = splbio();
 3059         bundirty(bp);
 3060         bp->b_flags &= ~B_DONE;
 3061         bp->b_ioflags &= ~BIO_ERROR;
 3062         bp->b_iocmd = BIO_WRITE;
 3063 
 3064         bufobj_wref(bp->b_bufobj);
 3065         curthread->td_ru.ru_oublock++;
 3066         splx(s);
 3067 
 3068         /*
 3069          * Note: to avoid loopback deadlocks, we do not
 3070          * assign b_runningbufspace.
 3071          */
 3072         vfs_busy_pages(bp, 1);
 3073 
 3074         BUF_KERNPROC(bp);
 3075         bp->b_iooffset = dbtob(bp->b_blkno);
 3076         bstrategy(bp);
 3077 
 3078         if( (oldflags & B_ASYNC) == 0) {
 3079                 int rtval = bufwait(bp);
 3080 
 3081                 if (oldflags & B_DELWRI) {
 3082                         s = splbio();
 3083                         reassignbuf(bp);
 3084                         splx(s);
 3085                 }
 3086                 brelse(bp);
 3087                 return (rtval);
 3088         }
 3089 
 3090         return (0);
 3091 }
 3092 
 3093 /*
 3094  * nfs special file access vnode op.
 3095  * Essentially just get vattr and then imitate iaccess() since the device is
 3096  * local to the client.
 3097  */
 3098 static int
 3099 nfsspec_access(struct vop_access_args *ap)
 3100 {
 3101         struct vattr *vap;
 3102         struct ucred *cred = ap->a_cred;
 3103         struct vnode *vp = ap->a_vp;
 3104         accmode_t accmode = ap->a_accmode;
 3105         struct vattr vattr;
 3106         int error;
 3107 
 3108         /*
 3109          * Disallow write attempts on filesystems mounted read-only;
 3110          * unless the file is a socket, fifo, or a block or character
 3111          * device resident on the filesystem.
 3112          */
 3113         if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3114                 switch (vp->v_type) {
 3115                 case VREG:
 3116                 case VDIR:
 3117                 case VLNK:
 3118                         return (EROFS);
 3119                 default:
 3120                         break;
 3121                 }
 3122         }
 3123         vap = &vattr;
 3124         error = VOP_GETATTR(vp, vap, cred);
 3125         if (error)
 3126                 goto out;
 3127         error  = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
 3128             accmode, cred, NULL);
 3129 out:
 3130         return error;
 3131 }
 3132 
 3133 /*
 3134  * Read wrapper for fifos.
 3135  */
 3136 static int
 3137 nfsfifo_read(struct vop_read_args *ap)
 3138 {
 3139         struct nfsnode *np = VTONFS(ap->a_vp);
 3140         int error;
 3141 
 3142         /*
 3143          * Set access flag.
 3144          */
 3145         mtx_lock(&np->n_mtx);
 3146         np->n_flag |= NACC;
 3147         getnanotime(&np->n_atim);
 3148         mtx_unlock(&np->n_mtx);
 3149         error = fifo_specops.vop_read(ap);
 3150         return error;   
 3151 }
 3152 
 3153 /*
 3154  * Write wrapper for fifos.
 3155  */
 3156 static int
 3157 nfsfifo_write(struct vop_write_args *ap)
 3158 {
 3159         struct nfsnode *np = VTONFS(ap->a_vp);
 3160 
 3161         /*
 3162          * Set update flag.
 3163          */
 3164         mtx_lock(&np->n_mtx);
 3165         np->n_flag |= NUPD;
 3166         getnanotime(&np->n_mtim);
 3167         mtx_unlock(&np->n_mtx);
 3168         return(fifo_specops.vop_write(ap));
 3169 }
 3170 
 3171 /*
 3172  * Close wrapper for fifos.
 3173  *
 3174  * Update the times on the nfsnode then do fifo close.
 3175  */
 3176 static int
 3177 nfsfifo_close(struct vop_close_args *ap)
 3178 {
 3179         struct vnode *vp = ap->a_vp;
 3180         struct nfsnode *np = VTONFS(vp);
 3181         struct vattr vattr;
 3182         struct timespec ts;
 3183 
 3184         mtx_lock(&np->n_mtx);
 3185         if (np->n_flag & (NACC | NUPD)) {
 3186                 getnanotime(&ts);
 3187                 if (np->n_flag & NACC)
 3188                         np->n_atim = ts;
 3189                 if (np->n_flag & NUPD)
 3190                         np->n_mtim = ts;
 3191                 np->n_flag |= NCHG;
 3192                 if (vrefcnt(vp) == 1 &&
 3193                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3194                         VATTR_NULL(&vattr);
 3195                         if (np->n_flag & NACC)
 3196                                 vattr.va_atime = np->n_atim;
 3197                         if (np->n_flag & NUPD)
 3198                                 vattr.va_mtime = np->n_mtim;
 3199                         mtx_unlock(&np->n_mtx);
 3200                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 3201                         goto out;
 3202                 }
 3203         }
 3204         mtx_unlock(&np->n_mtx);
 3205 out:
 3206         return (fifo_specops.vop_close(ap));
 3207 }
 3208 
 3209 /*
 3210  * Just call ncl_writebp() with the force argument set to 1.
 3211  *
 3212  * NOTE: B_DONE may or may not be set in a_bp on call.
 3213  */
 3214 static int
 3215 nfs_bwrite(struct buf *bp)
 3216 {
 3217 
 3218         return (ncl_writebp(bp, 1, curthread));
 3219 }
 3220 
 3221 struct buf_ops buf_ops_newnfs = {
 3222         .bop_name       =       "buf_ops_nfs",
 3223         .bop_write      =       nfs_bwrite,
 3224         .bop_strategy   =       bufstrategy,
 3225         .bop_sync       =       bufsync,
 3226         .bop_bdflush    =       bufbdflush,
 3227 };
 3228 
 3229 /*
 3230  * Cloned from vop_stdlock(), and then the ugly hack added.
 3231  */
 3232 static int
 3233 nfs_lock1(struct vop_lock1_args *ap)
 3234 {
 3235         struct vnode *vp = ap->a_vp;
 3236         int error = 0;
 3237 
 3238         /*
 3239          * Since vfs_hash_get() calls vget() and it will no longer work
 3240          * for FreeBSD8 with flags == 0, I can only think of this horrible
 3241          * hack to work around it. I call vfs_hash_get() with LK_EXCLOTHER
 3242          * and then handle it here. All I want for this case is a v_usecount
 3243          * on the vnode to use for recovery, while another thread might
 3244          * hold a lock on the vnode. I have the other threads blocked, so
 3245          * there isn't any race problem.
 3246          */
 3247         if ((ap->a_flags & LK_TYPE_MASK) == LK_EXCLOTHER) {
 3248                 if ((ap->a_flags & LK_INTERLOCK) == 0)
 3249                         panic("ncllock1");
 3250                 if ((vp->v_iflag & VI_DOOMED))
 3251                         error = ENOENT;
 3252                 VI_UNLOCK(vp);
 3253                 return (error);
 3254         }
 3255         return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
 3256             LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
 3257             ap->a_line));
 3258 }
 3259 
 3260 static int
 3261 nfs_getacl(struct vop_getacl_args *ap)
 3262 {
 3263         int error;
 3264 
 3265         if (ap->a_type != ACL_TYPE_NFS4)
 3266                 return (EOPNOTSUPP);
 3267         error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3268             NULL);
 3269         if (error > NFSERR_STALE) {
 3270                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3271                 error = EPERM;
 3272         }
 3273         return (error);
 3274 }
 3275 
 3276 static int
 3277 nfs_setacl(struct vop_setacl_args *ap)
 3278 {
 3279         int error;
 3280 
 3281         if (ap->a_type != ACL_TYPE_NFS4)
 3282                 return (EOPNOTSUPP);
 3283         error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3284             NULL);
 3285         if (error > NFSERR_STALE) {
 3286                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3287                 error = EPERM;
 3288         }
 3289         return (error);
 3290 }
 3291 
 3292 /*
 3293  * Return POSIX pathconf information applicable to nfs filesystems.
 3294  */
 3295 static int
 3296 nfs_pathconf(struct vop_pathconf_args *ap)
 3297 {
 3298         struct nfsv3_pathconf pc;
 3299         struct nfsvattr nfsva;
 3300         struct vnode *vp = ap->a_vp;
 3301         struct thread *td = curthread;
 3302         int attrflag, error;
 3303 
 3304         if (NFS_ISV4(vp) || (NFS_ISV3(vp) && (ap->a_name == _PC_LINK_MAX ||
 3305             ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
 3306             ap->a_name == _PC_NO_TRUNC))) {
 3307                 /*
 3308                  * Since only the above 4 a_names are returned by the NFSv3
 3309                  * Pathconf RPC, there is no point in doing it for others.
 3310                  */
 3311                 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
 3312                     &attrflag, NULL);
 3313                 if (attrflag != 0)
 3314                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 3315                             1);
 3316                 if (error != 0)
 3317                         return (error);
 3318         } else {
 3319                 /*
 3320                  * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
 3321                  * just fake them.
 3322                  */
 3323                 pc.pc_linkmax = LINK_MAX;
 3324                 pc.pc_namemax = NFS_MAXNAMLEN;
 3325                 pc.pc_notrunc = 1;
 3326                 pc.pc_chownrestricted = 1;
 3327                 pc.pc_caseinsensitive = 0;
 3328                 pc.pc_casepreserving = 1;
 3329                 error = 0;
 3330         }
 3331         switch (ap->a_name) {
 3332         case _PC_LINK_MAX:
 3333                 *ap->a_retval = pc.pc_linkmax;
 3334                 break;
 3335         case _PC_NAME_MAX:
 3336                 *ap->a_retval = pc.pc_namemax;
 3337                 break;
 3338         case _PC_PATH_MAX:
 3339                 *ap->a_retval = PATH_MAX;
 3340                 break;
 3341         case _PC_PIPE_BUF:
 3342                 *ap->a_retval = PIPE_BUF;
 3343                 break;
 3344         case _PC_CHOWN_RESTRICTED:
 3345                 *ap->a_retval = pc.pc_chownrestricted;
 3346                 break;
 3347         case _PC_NO_TRUNC:
 3348                 *ap->a_retval = pc.pc_notrunc;
 3349                 break;
 3350         case _PC_ACL_EXTENDED:
 3351                 *ap->a_retval = 0;
 3352                 break;
 3353         case _PC_ACL_NFS4:
 3354                 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
 3355                     NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
 3356                         *ap->a_retval = 1;
 3357                 else
 3358                         *ap->a_retval = 0;
 3359                 break;
 3360         case _PC_ACL_PATH_MAX:
 3361                 if (NFS_ISV4(vp))
 3362                         *ap->a_retval = ACL_MAX_ENTRIES;
 3363                 else
 3364                         *ap->a_retval = 3;
 3365                 break;
 3366         case _PC_MAC_PRESENT:
 3367                 *ap->a_retval = 0;
 3368                 break;
 3369         case _PC_ASYNC_IO:
 3370                 /* _PC_ASYNC_IO should have been handled by upper layers. */
 3371                 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
 3372                 error = EINVAL;
 3373                 break;
 3374         case _PC_PRIO_IO:
 3375                 *ap->a_retval = 0;
 3376                 break;
 3377         case _PC_SYNC_IO:
 3378                 *ap->a_retval = 0;
 3379                 break;
 3380         case _PC_ALLOC_SIZE_MIN:
 3381                 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
 3382                 break;
 3383         case _PC_FILESIZEBITS:
 3384                 if (NFS_ISV34(vp))
 3385                         *ap->a_retval = 64;
 3386                 else
 3387                         *ap->a_retval = 32;
 3388                 break;
 3389         case _PC_REC_INCR_XFER_SIZE:
 3390                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3391                 break;
 3392         case _PC_REC_MAX_XFER_SIZE:
 3393                 *ap->a_retval = -1; /* means ``unlimited'' */
 3394                 break;
 3395         case _PC_REC_MIN_XFER_SIZE:
 3396                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3397                 break;
 3398         case _PC_REC_XFER_ALIGN:
 3399                 *ap->a_retval = PAGE_SIZE;
 3400                 break;
 3401         case _PC_SYMLINK_MAX:
 3402                 *ap->a_retval = NFS_MAXPATHLEN;
 3403                 break;
 3404 
 3405         default:
 3406                 error = EINVAL;
 3407                 break;
 3408         }
 3409         return (error);
 3410 }
 3411 

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