The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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: stable/8/sys/fs/nfsclient/nfs_clvnops.c 247503 2013-02-28 21:58:07Z jhb $");
   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 int newnfs_keep_dirty_on_error;
  226 SYSCTL_INT(_vfs_newnfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
  227     &newnfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
  228 
  229 /*
  230  * This sysctl allows other processes to mmap a file that has been opened
  231  * O_DIRECT by a process.  In general, having processes mmap the file while
  232  * Direct IO is in progress can lead to Data Inconsistencies.  But, we allow
  233  * this by default to prevent DoS attacks - to prevent a malicious user from
  234  * opening up files O_DIRECT preventing other users from mmap'ing these
  235  * files.  "Protected" environments where stricter consistency guarantees are
  236  * required can disable this knob.  The process that opened the file O_DIRECT
  237  * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
  238  * meaningful.
  239  */
  240 int newnfs_directio_allow_mmap = 1;
  241 SYSCTL_INT(_vfs_newnfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
  242            &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
  243 
  244 #if 0
  245 SYSCTL_INT(_vfs_newnfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
  246            &newnfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
  247 
  248 SYSCTL_INT(_vfs_newnfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
  249            &newnfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
  250 #endif
  251 
  252 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY                \
  253                          | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
  254                          | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
  255 
  256 /*
  257  * SMP Locking Note :
  258  * The list of locks after the description of the lock is the ordering
  259  * of other locks acquired with the lock held.
  260  * np->n_mtx : Protects the fields in the nfsnode.
  261        VM Object Lock
  262        VI_MTX (acquired indirectly)
  263  * nmp->nm_mtx : Protects the fields in the nfsmount.
  264        rep->r_mtx
  265  * ncl_iod_mutex : Global lock, protects shared nfsiod state.
  266  * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
  267        nmp->nm_mtx
  268        rep->r_mtx
  269  * rep->r_mtx : Protects the fields in an nfsreq.
  270  */
  271 
  272 static int
  273 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
  274     struct ucred *cred, u_int32_t *retmode)
  275 {
  276         int error = 0, attrflag, i, lrupos;
  277         u_int32_t rmode;
  278         struct nfsnode *np = VTONFS(vp);
  279         struct nfsvattr nfsva;
  280 
  281         error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
  282             &rmode, NULL);
  283         if (attrflag)
  284                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
  285         if (!error) {
  286                 lrupos = 0;
  287                 mtx_lock(&np->n_mtx);
  288                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  289                         if (np->n_accesscache[i].uid == cred->cr_uid) {
  290                                 np->n_accesscache[i].mode = rmode;
  291                                 np->n_accesscache[i].stamp = time_second;
  292                                 break;
  293                         }
  294                         if (i > 0 && np->n_accesscache[i].stamp <
  295                             np->n_accesscache[lrupos].stamp)
  296                                 lrupos = i;
  297                 }
  298                 if (i == NFS_ACCESSCACHESIZE) {
  299                         np->n_accesscache[lrupos].uid = cred->cr_uid;
  300                         np->n_accesscache[lrupos].mode = rmode;
  301                         np->n_accesscache[lrupos].stamp = time_second;
  302                 }
  303                 mtx_unlock(&np->n_mtx);
  304                 if (retmode != NULL)
  305                         *retmode = rmode;
  306         } else if (NFS_ISV4(vp)) {
  307                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  308         }
  309         return (error);
  310 }
  311 
  312 /*
  313  * nfs access vnode op.
  314  * For nfs version 2, just return ok. File accesses may fail later.
  315  * For nfs version 3, use the access rpc to check accessibility. If file modes
  316  * are changed on the server, accesses might still fail later.
  317  */
  318 static int
  319 nfs_access(struct vop_access_args *ap)
  320 {
  321         struct vnode *vp = ap->a_vp;
  322         int error = 0, i, gotahit;
  323         u_int32_t mode, wmode, rmode;
  324         int v34 = NFS_ISV34(vp);
  325         struct nfsnode *np = VTONFS(vp);
  326 
  327         /*
  328          * Disallow write attempts on filesystems mounted read-only;
  329          * unless the file is a socket, fifo, or a block or character
  330          * device resident on the filesystem.
  331          */
  332         if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
  333             VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
  334             VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
  335                 switch (vp->v_type) {
  336                 case VREG:
  337                 case VDIR:
  338                 case VLNK:
  339                         return (EROFS);
  340                 default:
  341                         break;
  342                 }
  343         }
  344         /*
  345          * For nfs v3 or v4, check to see if we have done this recently, and if
  346          * so return our cached result instead of making an ACCESS call.
  347          * If not, do an access rpc, otherwise you are stuck emulating
  348          * ufs_access() locally using the vattr. This may not be correct,
  349          * since the server may apply other access criteria such as
  350          * client uid-->server uid mapping that we do not know about.
  351          */
  352         if (v34) {
  353                 if (ap->a_accmode & VREAD)
  354                         mode = NFSACCESS_READ;
  355                 else
  356                         mode = 0;
  357                 if (vp->v_type != VDIR) {
  358                         if (ap->a_accmode & VWRITE)
  359                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  360                         if (ap->a_accmode & VAPPEND)
  361                                 mode |= NFSACCESS_EXTEND;
  362                         if (ap->a_accmode & VEXEC)
  363                                 mode |= NFSACCESS_EXECUTE;
  364                         if (ap->a_accmode & VDELETE)
  365                                 mode |= NFSACCESS_DELETE;
  366                 } else {
  367                         if (ap->a_accmode & VWRITE)
  368                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  369                         if (ap->a_accmode & VAPPEND)
  370                                 mode |= NFSACCESS_EXTEND;
  371                         if (ap->a_accmode & VEXEC)
  372                                 mode |= NFSACCESS_LOOKUP;
  373                         if (ap->a_accmode & VDELETE)
  374                                 mode |= NFSACCESS_DELETE;
  375                         if (ap->a_accmode & VDELETE_CHILD)
  376                                 mode |= NFSACCESS_MODIFY;
  377                 }
  378                 /* XXX safety belt, only make blanket request if caching */
  379                 if (nfsaccess_cache_timeout > 0) {
  380                         wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
  381                                 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
  382                                 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
  383                 } else {
  384                         wmode = mode;
  385                 }
  386 
  387                 /*
  388                  * Does our cached result allow us to give a definite yes to
  389                  * this request?
  390                  */
  391                 gotahit = 0;
  392                 mtx_lock(&np->n_mtx);
  393                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  394                         if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
  395                             if (time_second < (np->n_accesscache[i].stamp
  396                                 + nfsaccess_cache_timeout) &&
  397                                 (np->n_accesscache[i].mode & mode) == mode) {
  398                                 NFSINCRGLOBAL(newnfsstats.accesscache_hits);
  399                                 gotahit = 1;
  400                             }
  401                             break;
  402                         }
  403                 }
  404                 mtx_unlock(&np->n_mtx);
  405                 if (gotahit == 0) {
  406                         /*
  407                          * Either a no, or a don't know.  Go to the wire.
  408                          */
  409                         NFSINCRGLOBAL(newnfsstats.accesscache_misses);
  410                         error = nfs34_access_otw(vp, wmode, ap->a_td,
  411                             ap->a_cred, &rmode);
  412                         if (!error &&
  413                             (rmode & mode) != mode)
  414                                 error = EACCES;
  415                 }
  416                 return (error);
  417         } else {
  418                 if ((error = nfsspec_access(ap)) != 0) {
  419                         return (error);
  420                 }
  421                 /*
  422                  * Attempt to prevent a mapped root from accessing a file
  423                  * which it shouldn't.  We try to read a byte from the file
  424                  * if the user is root and the file is not zero length.
  425                  * After calling nfsspec_access, we should have the correct
  426                  * file size cached.
  427                  */
  428                 mtx_lock(&np->n_mtx);
  429                 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
  430                     && VTONFS(vp)->n_size > 0) {
  431                         struct iovec aiov;
  432                         struct uio auio;
  433                         char buf[1];
  434 
  435                         mtx_unlock(&np->n_mtx);
  436                         aiov.iov_base = buf;
  437                         aiov.iov_len = 1;
  438                         auio.uio_iov = &aiov;
  439                         auio.uio_iovcnt = 1;
  440                         auio.uio_offset = 0;
  441                         auio.uio_resid = 1;
  442                         auio.uio_segflg = UIO_SYSSPACE;
  443                         auio.uio_rw = UIO_READ;
  444                         auio.uio_td = ap->a_td;
  445 
  446                         if (vp->v_type == VREG)
  447                                 error = ncl_readrpc(vp, &auio, ap->a_cred);
  448                         else if (vp->v_type == VDIR) {
  449                                 char* bp;
  450                                 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
  451                                 aiov.iov_base = bp;
  452                                 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
  453                                 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
  454                                     ap->a_td);
  455                                 free(bp, M_TEMP);
  456                         } else if (vp->v_type == VLNK)
  457                                 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
  458                         else
  459                                 error = EACCES;
  460                 } else
  461                         mtx_unlock(&np->n_mtx);
  462                 return (error);
  463         }
  464 }
  465 
  466 
  467 /*
  468  * nfs open vnode op
  469  * Check to see if the type is ok
  470  * and that deletion is not in progress.
  471  * For paged in text files, you will need to flush the page cache
  472  * if consistency is lost.
  473  */
  474 /* ARGSUSED */
  475 static int
  476 nfs_open(struct vop_open_args *ap)
  477 {
  478         struct vnode *vp = ap->a_vp;
  479         struct nfsnode *np = VTONFS(vp);
  480         struct vattr vattr;
  481         int error;
  482         int fmode = ap->a_mode;
  483         struct ucred *cred;
  484 
  485         if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
  486                 return (EOPNOTSUPP);
  487 
  488         /*
  489          * For NFSv4, we need to do the Open Op before cache validation,
  490          * so that we conform to RFC3530 Sec. 9.3.1.
  491          */
  492         if (NFS_ISV4(vp)) {
  493                 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
  494                 if (error) {
  495                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  496                             (gid_t)0);
  497                         return (error);
  498                 }
  499         }
  500 
  501         /*
  502          * Now, if this Open will be doing reading, re-validate/flush the
  503          * cache, so that Close/Open coherency is maintained.
  504          */
  505         mtx_lock(&np->n_mtx);
  506         if (np->n_flag & NMODIFIED) {
  507                 mtx_unlock(&np->n_mtx);
  508                 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  509                 if (error == EINTR || error == EIO) {
  510                         if (NFS_ISV4(vp))
  511                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  512                         return (error);
  513                 }
  514                 mtx_lock(&np->n_mtx);
  515                 np->n_attrstamp = 0;
  516                 if (vp->v_type == VDIR)
  517                         np->n_direofoffset = 0;
  518                 mtx_unlock(&np->n_mtx);
  519                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  520                 if (error) {
  521                         if (NFS_ISV4(vp))
  522                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  523                         return (error);
  524                 }
  525                 mtx_lock(&np->n_mtx);
  526                 np->n_mtime = vattr.va_mtime;
  527                 if (NFS_ISV4(vp))
  528                         np->n_change = vattr.va_filerev;
  529         } else {
  530                 mtx_unlock(&np->n_mtx);
  531                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  532                 if (error) {
  533                         if (NFS_ISV4(vp))
  534                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  535                         return (error);
  536                 }
  537                 mtx_lock(&np->n_mtx);
  538                 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
  539                     NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
  540                         if (vp->v_type == VDIR)
  541                                 np->n_direofoffset = 0;
  542                         mtx_unlock(&np->n_mtx);
  543                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  544                         if (error == EINTR || error == EIO) {
  545                                 if (NFS_ISV4(vp))
  546                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  547                                 return (error);
  548                         }
  549                         mtx_lock(&np->n_mtx);
  550                         np->n_mtime = vattr.va_mtime;
  551                         if (NFS_ISV4(vp))
  552                                 np->n_change = vattr.va_filerev;
  553                 }
  554         }
  555 
  556         /*
  557          * If the object has >= 1 O_DIRECT active opens, we disable caching.
  558          */
  559         if (newnfs_directio_enable && (fmode & O_DIRECT) &&
  560             (vp->v_type == VREG)) {
  561                 if (np->n_directio_opens == 0) {
  562                         mtx_unlock(&np->n_mtx);
  563                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  564                         if (error) {
  565                                 if (NFS_ISV4(vp))
  566                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  567                                 return (error);
  568                         }
  569                         mtx_lock(&np->n_mtx);
  570                         np->n_flag |= NNONCACHE;
  571                 }
  572                 np->n_directio_opens++;
  573         }
  574 
  575         /*
  576          * If this is an open for writing, capture a reference to the
  577          * credentials, so they can be used by ncl_putpages(). Using
  578          * these write credentials is preferable to the credentials of
  579          * whatever thread happens to be doing the VOP_PUTPAGES() since
  580          * the write RPCs are less likely to fail with EACCES.
  581          */
  582         if ((fmode & FWRITE) != 0) {
  583                 cred = np->n_writecred;
  584                 np->n_writecred = crhold(ap->a_cred);
  585         } else
  586                 cred = NULL;
  587         mtx_unlock(&np->n_mtx);
  588         if (cred != NULL)
  589                 crfree(cred);
  590         vnode_create_vobject(vp, vattr.va_size, ap->a_td);
  591         return (0);
  592 }
  593 
  594 /*
  595  * nfs close vnode op
  596  * What an NFS client should do upon close after writing is a debatable issue.
  597  * Most NFS clients push delayed writes to the server upon close, basically for
  598  * two reasons:
  599  * 1 - So that any write errors may be reported back to the client process
  600  *     doing the close system call. By far the two most likely errors are
  601  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
  602  * 2 - To put a worst case upper bound on cache inconsistency between
  603  *     multiple clients for the file.
  604  * There is also a consistency problem for Version 2 of the protocol w.r.t.
  605  * not being able to tell if other clients are writing a file concurrently,
  606  * since there is no way of knowing if the changed modify time in the reply
  607  * is only due to the write for this client.
  608  * (NFS Version 3 provides weak cache consistency data in the reply that
  609  *  should be sufficient to detect and handle this case.)
  610  *
  611  * The current code does the following:
  612  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
  613  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
  614  *                     or commit them (this satisfies 1 and 2 except for the
  615  *                     case where the server crashes after this close but
  616  *                     before the commit RPC, which is felt to be "good
  617  *                     enough". Changing the last argument to ncl_flush() to
  618  *                     a 1 would force a commit operation, if it is felt a
  619  *                     commit is necessary now.
  620  * for NFS Version 4 - flush the dirty buffers and commit them, if
  621  *                     nfscl_mustflush() says this is necessary.
  622  *                     It is necessary if there is no write delegation held,
  623  *                     in order to satisfy open/close coherency.
  624  *                     If the file isn't cached on local stable storage,
  625  *                     it may be necessary in order to detect "out of space"
  626  *                     errors from the server, if the write delegation
  627  *                     issued by the server doesn't allow the file to grow.
  628  */
  629 /* ARGSUSED */
  630 static int
  631 nfs_close(struct vop_close_args *ap)
  632 {
  633         struct vnode *vp = ap->a_vp;
  634         struct nfsnode *np = VTONFS(vp);
  635         struct nfsvattr nfsva;
  636         struct ucred *cred;
  637         int error = 0, ret, localcred = 0;
  638         int fmode = ap->a_fflag;
  639 
  640         if ((vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF))
  641                 return (0);
  642         /*
  643          * During shutdown, a_cred isn't valid, so just use root.
  644          */
  645         if (ap->a_cred == NOCRED) {
  646                 cred = newnfs_getcred();
  647                 localcred = 1;
  648         } else {
  649                 cred = ap->a_cred;
  650         }
  651         if (vp->v_type == VREG) {
  652             /*
  653              * Examine and clean dirty pages, regardless of NMODIFIED.
  654              * This closes a major hole in close-to-open consistency.
  655              * We want to push out all dirty pages (and buffers) on
  656              * close, regardless of whether they were dirtied by
  657              * mmap'ed writes or via write().
  658              */
  659             if (nfs_clean_pages_on_close && vp->v_object) {
  660                 VM_OBJECT_LOCK(vp->v_object);
  661                 vm_object_page_clean(vp->v_object, 0, 0, 0);
  662                 VM_OBJECT_UNLOCK(vp->v_object);
  663             }
  664             mtx_lock(&np->n_mtx);
  665             if (np->n_flag & NMODIFIED) {
  666                 mtx_unlock(&np->n_mtx);
  667                 if (NFS_ISV3(vp)) {
  668                     /*
  669                      * Under NFSv3 we have dirty buffers to dispose of.  We
  670                      * must flush them to the NFS server.  We have the option
  671                      * of waiting all the way through the commit rpc or just
  672                      * waiting for the initial write.  The default is to only
  673                      * wait through the initial write so the data is in the
  674                      * server's cache, which is roughly similar to the state
  675                      * a standard disk subsystem leaves the file in on close().
  676                      *
  677                      * We cannot clear the NMODIFIED bit in np->n_flag due to
  678                      * potential races with other processes, and certainly
  679                      * cannot clear it if we don't commit.
  680                      * These races occur when there is no longer the old
  681                      * traditional vnode locking implemented for Vnode Ops.
  682                      */
  683                     int cm = newnfs_commit_on_close ? 1 : 0;
  684                     error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td, cm, 0);
  685                     /* np->n_flag &= ~NMODIFIED; */
  686                 } else if (NFS_ISV4(vp)) { 
  687                         if (nfscl_mustflush(vp) != 0) {
  688                                 int cm = newnfs_commit_on_close ? 1 : 0;
  689                                 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td,
  690                                     cm, 0);
  691                                 /*
  692                                  * as above w.r.t races when clearing
  693                                  * NMODIFIED.
  694                                  * np->n_flag &= ~NMODIFIED;
  695                                  */
  696                         }
  697                 } else
  698                     error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  699                 mtx_lock(&np->n_mtx);
  700             }
  701             /* 
  702              * Invalidate the attribute cache in all cases.
  703              * An open is going to fetch fresh attrs any way, other procs
  704              * on this node that have file open will be forced to do an 
  705              * otw attr fetch, but this is safe.
  706              * --> A user found that their RPC count dropped by 20% when
  707              *     this was commented out and I can't see any requirement
  708              *     for it, so I've disabled it when negative lookups are
  709              *     enabled. (What does this have to do with negative lookup
  710              *     caching? Well nothing, except it was reported by the
  711              *     same user that needed negative lookup caching and I wanted
  712              *     there to be a way to disable it to see if it
  713              *     is the cause of some caching/coherency issue that might
  714              *     crop up.)
  715              */
  716             if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0)
  717                     np->n_attrstamp = 0;
  718             if (np->n_flag & NWRITEERR) {
  719                 np->n_flag &= ~NWRITEERR;
  720                 error = np->n_error;
  721             }
  722             mtx_unlock(&np->n_mtx);
  723         }
  724 
  725         if (NFS_ISV4(vp)) {
  726                 /*
  727                  * Get attributes so "change" is up to date.
  728                  */
  729                 if (error == 0 && nfscl_mustflush(vp) != 0) {
  730                         ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
  731                             NULL);
  732                         if (!ret) {
  733                                 np->n_change = nfsva.na_filerev;
  734                                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
  735                                     NULL, 0, 0);
  736                         }
  737                 }
  738 
  739                 /*
  740                  * and do the close.
  741                  */
  742                 ret = nfsrpc_close(vp, 0, ap->a_td);
  743                 if (!error && ret)
  744                         error = ret;
  745                 if (error)
  746                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  747                             (gid_t)0);
  748         }
  749         if (newnfs_directio_enable)
  750                 KASSERT((np->n_directio_asyncwr == 0),
  751                         ("nfs_close: dirty unflushed (%d) directio buffers\n",
  752                          np->n_directio_asyncwr));
  753         if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  754                 mtx_lock(&np->n_mtx);
  755                 KASSERT((np->n_directio_opens > 0), 
  756                         ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
  757                 np->n_directio_opens--;
  758                 if (np->n_directio_opens == 0)
  759                         np->n_flag &= ~NNONCACHE;
  760                 mtx_unlock(&np->n_mtx);
  761         }
  762         if (localcred)
  763                 NFSFREECRED(cred);
  764         return (error);
  765 }
  766 
  767 /*
  768  * nfs getattr call from vfs.
  769  */
  770 static int
  771 nfs_getattr(struct vop_getattr_args *ap)
  772 {
  773         struct vnode *vp = ap->a_vp;
  774         struct thread *td = curthread;  /* XXX */
  775         struct nfsnode *np = VTONFS(vp);
  776         int error = 0;
  777         struct nfsvattr nfsva;
  778         struct vattr *vap = ap->a_vap;
  779         struct vattr vattr;
  780 
  781         /*
  782          * Update local times for special files.
  783          */
  784         mtx_lock(&np->n_mtx);
  785         if (np->n_flag & (NACC | NUPD))
  786                 np->n_flag |= NCHG;
  787         mtx_unlock(&np->n_mtx);
  788         /*
  789          * First look in the cache.
  790          */
  791         if (ncl_getattrcache(vp, &vattr) == 0) {
  792                 vap->va_type = vattr.va_type;
  793                 vap->va_mode = vattr.va_mode;
  794                 vap->va_nlink = vattr.va_nlink;
  795                 vap->va_uid = vattr.va_uid;
  796                 vap->va_gid = vattr.va_gid;
  797                 vap->va_fsid = vattr.va_fsid;
  798                 vap->va_fileid = vattr.va_fileid;
  799                 vap->va_size = vattr.va_size;
  800                 vap->va_blocksize = vattr.va_blocksize;
  801                 vap->va_atime = vattr.va_atime;
  802                 vap->va_mtime = vattr.va_mtime;
  803                 vap->va_ctime = vattr.va_ctime;
  804                 vap->va_gen = vattr.va_gen;
  805                 vap->va_flags = vattr.va_flags;
  806                 vap->va_rdev = vattr.va_rdev;
  807                 vap->va_bytes = vattr.va_bytes;
  808                 vap->va_filerev = vattr.va_filerev;
  809                 /*
  810                  * Get the local modify time for the case of a write
  811                  * delegation.
  812                  */
  813                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  814                 return (0);
  815         }
  816 
  817         if (NFS_ISV34(vp) && nfs_prime_access_cache &&
  818             nfsaccess_cache_timeout > 0) {
  819                 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
  820                 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
  821                 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
  822                         nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
  823                         return (0);
  824                 }
  825         }
  826         error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
  827         if (!error)
  828                 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
  829         if (!error) {
  830                 /*
  831                  * Get the local modify time for the case of a write
  832                  * delegation.
  833                  */
  834                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  835         } else if (NFS_ISV4(vp)) {
  836                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  837         }
  838         return (error);
  839 }
  840 
  841 /*
  842  * nfs setattr call.
  843  */
  844 static int
  845 nfs_setattr(struct vop_setattr_args *ap)
  846 {
  847         struct vnode *vp = ap->a_vp;
  848         struct nfsnode *np = VTONFS(vp);
  849         struct thread *td = curthread;  /* XXX */
  850         struct vattr *vap = ap->a_vap;
  851         int error = 0;
  852         u_quad_t tsize;
  853 
  854 #ifndef nolint
  855         tsize = (u_quad_t)0;
  856 #endif
  857 
  858         /*
  859          * Setting of flags and marking of atimes are not supported.
  860          */
  861         if (vap->va_flags != VNOVAL)
  862                 return (EOPNOTSUPP);
  863 
  864         /*
  865          * Disallow write attempts if the filesystem is mounted read-only.
  866          */
  867         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  868             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  869             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  870             (vp->v_mount->mnt_flag & MNT_RDONLY))
  871                 return (EROFS);
  872         if (vap->va_size != VNOVAL) {
  873                 switch (vp->v_type) {
  874                 case VDIR:
  875                         return (EISDIR);
  876                 case VCHR:
  877                 case VBLK:
  878                 case VSOCK:
  879                 case VFIFO:
  880                         if (vap->va_mtime.tv_sec == VNOVAL &&
  881                             vap->va_atime.tv_sec == VNOVAL &&
  882                             vap->va_mode == (mode_t)VNOVAL &&
  883                             vap->va_uid == (uid_t)VNOVAL &&
  884                             vap->va_gid == (gid_t)VNOVAL)
  885                                 return (0);             
  886                         vap->va_size = VNOVAL;
  887                         break;
  888                 default:
  889                         /*
  890                          * Disallow write attempts if the filesystem is
  891                          * mounted read-only.
  892                          */
  893                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  894                                 return (EROFS);
  895                         /*
  896                          *  We run vnode_pager_setsize() early (why?),
  897                          * we must set np->n_size now to avoid vinvalbuf
  898                          * V_SAVE races that might setsize a lower
  899                          * value.
  900                          */
  901                         mtx_lock(&np->n_mtx);
  902                         tsize = np->n_size;
  903                         mtx_unlock(&np->n_mtx);
  904                         error = ncl_meta_setsize(vp, ap->a_cred, td,
  905                             vap->va_size);
  906                         mtx_lock(&np->n_mtx);
  907                         if (np->n_flag & NMODIFIED) {
  908                             tsize = np->n_size;
  909                             mtx_unlock(&np->n_mtx);
  910                             if (vap->va_size == 0)
  911                                 error = ncl_vinvalbuf(vp, 0, td, 1);
  912                             else
  913                                 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
  914                             if (error) {
  915                                 vnode_pager_setsize(vp, tsize);
  916                                 return (error);
  917                             }
  918                             /*
  919                              * Call nfscl_delegmodtime() to set the modify time
  920                              * locally, as required.
  921                              */
  922                             nfscl_delegmodtime(vp);
  923                         } else
  924                             mtx_unlock(&np->n_mtx);
  925                         /*
  926                          * np->n_size has already been set to vap->va_size
  927                          * in ncl_meta_setsize(). We must set it again since
  928                          * nfs_loadattrcache() could be called through
  929                          * ncl_meta_setsize() and could modify np->n_size.
  930                          */
  931                         mtx_lock(&np->n_mtx);
  932                         np->n_vattr.na_size = np->n_size = vap->va_size;
  933                         mtx_unlock(&np->n_mtx);
  934                 };
  935         } else {
  936                 mtx_lock(&np->n_mtx);
  937                 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 
  938                     (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
  939                         mtx_unlock(&np->n_mtx);
  940                         if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
  941                             (error == EINTR || error == EIO))
  942                                 return (error);
  943                 } else
  944                         mtx_unlock(&np->n_mtx);
  945         }
  946         error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
  947         if (error && vap->va_size != VNOVAL) {
  948                 mtx_lock(&np->n_mtx);
  949                 np->n_size = np->n_vattr.na_size = tsize;
  950                 vnode_pager_setsize(vp, tsize);
  951                 mtx_unlock(&np->n_mtx);
  952         }
  953         return (error);
  954 }
  955 
  956 /*
  957  * Do an nfs setattr rpc.
  958  */
  959 static int
  960 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
  961     struct thread *td)
  962 {
  963         struct nfsnode *np = VTONFS(vp);
  964         int error, ret, attrflag, i;
  965         struct nfsvattr nfsva;
  966 
  967         if (NFS_ISV34(vp)) {
  968                 mtx_lock(&np->n_mtx);
  969                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  970                         np->n_accesscache[i].stamp = 0;
  971                 np->n_flag |= NDELEGMOD;
  972                 mtx_unlock(&np->n_mtx);
  973         }
  974         error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
  975             NULL);
  976         if (attrflag) {
  977                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
  978                 if (ret && !error)
  979                         error = ret;
  980         }
  981         if (error && NFS_ISV4(vp))
  982                 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
  983         return (error);
  984 }
  985 
  986 /*
  987  * nfs lookup call, one step at a time...
  988  * First look in cache
  989  * If not found, unlock the directory nfsnode and do the rpc
  990  */
  991 static int
  992 nfs_lookup(struct vop_lookup_args *ap)
  993 {
  994         struct componentname *cnp = ap->a_cnp;
  995         struct vnode *dvp = ap->a_dvp;
  996         struct vnode **vpp = ap->a_vpp;
  997         struct mount *mp = dvp->v_mount;
  998         int flags = cnp->cn_flags;
  999         struct vnode *newvp;
 1000         struct nfsmount *nmp;
 1001         struct nfsnode *np, *newnp;
 1002         int error = 0, attrflag, dattrflag, ltype, ncticks;
 1003         struct thread *td = cnp->cn_thread;
 1004         struct nfsfh *nfhp;
 1005         struct nfsvattr dnfsva, nfsva;
 1006         struct vattr vattr;
 1007         struct timespec nctime;
 1008         
 1009         *vpp = NULLVP;
 1010         if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
 1011             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
 1012                 return (EROFS);
 1013         if (dvp->v_type != VDIR)
 1014                 return (ENOTDIR);
 1015         nmp = VFSTONFS(mp);
 1016         np = VTONFS(dvp);
 1017 
 1018         /* For NFSv4, wait until any remove is done. */
 1019         mtx_lock(&np->n_mtx);
 1020         while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
 1021                 np->n_flag |= NREMOVEWANT;
 1022                 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
 1023         }
 1024         mtx_unlock(&np->n_mtx);
 1025 
 1026         if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
 1027                 return (error);
 1028         error = cache_lookup_times(dvp, vpp, cnp, &nctime, &ncticks);
 1029         if (error > 0 && error != ENOENT)
 1030                 return (error);
 1031         if (error == -1) {
 1032                 /*
 1033                  * Lookups of "." are special and always return the
 1034                  * current directory.  cache_lookup() already handles
 1035                  * associated locking bookkeeping, etc.
 1036                  */
 1037                 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
 1038                         /* XXX: Is this really correct? */
 1039                         if (cnp->cn_nameiop != LOOKUP &&
 1040                             (flags & ISLASTCN))
 1041                                 cnp->cn_flags |= SAVENAME;
 1042                         return (0);
 1043                 }
 1044 
 1045                 /*
 1046                  * We only accept a positive hit in the cache if the
 1047                  * change time of the file matches our cached copy.
 1048                  * Otherwise, we discard the cache entry and fallback
 1049                  * to doing a lookup RPC.  We also only trust cache
 1050                  * entries for less than nm_nametimeo seconds.
 1051                  *
 1052                  * To better handle stale file handles and attributes,
 1053                  * clear the attribute cache of this node if it is a
 1054                  * leaf component, part of an open() call, and not
 1055                  * locally modified before fetching the attributes.
 1056                  * This should allow stale file handles to be detected
 1057                  * here where we can fall back to a LOOKUP RPC to
 1058                  * recover rather than having nfs_open() detect the
 1059                  * stale file handle and failing open(2) with ESTALE.
 1060                  */
 1061                 newvp = *vpp;
 1062                 newnp = VTONFS(newvp);
 1063                 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
 1064                     (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1065                     !(newnp->n_flag & NMODIFIED)) {
 1066                         mtx_lock(&newnp->n_mtx);
 1067                         newnp->n_attrstamp = 0;
 1068                         mtx_unlock(&newnp->n_mtx);
 1069                 }
 1070                 if (nfscl_nodeleg(newvp, 0) == 0 ||
 1071                     ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
 1072                     VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
 1073                     timespeccmp(&vattr.va_ctime, &nctime, ==))) {
 1074                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1075                         if (cnp->cn_nameiop != LOOKUP &&
 1076                             (flags & ISLASTCN))
 1077                                 cnp->cn_flags |= SAVENAME;
 1078                         return (0);
 1079                 }
 1080                 cache_purge(newvp);
 1081                 if (dvp != newvp)
 1082                         vput(newvp);
 1083                 else 
 1084                         vrele(newvp);
 1085                 *vpp = NULLVP;
 1086         } else if (error == ENOENT) {
 1087                 if (dvp->v_iflag & VI_DOOMED)
 1088                         return (ENOENT);
 1089                 /*
 1090                  * We only accept a negative hit in the cache if the
 1091                  * modification time of the parent directory matches
 1092                  * the cached copy in the name cache entry.
 1093                  * Otherwise, we discard all of the negative cache
 1094                  * entries for this directory.  We also only trust
 1095                  * negative cache entries for up to nm_negnametimeo
 1096                  * seconds.
 1097                  */
 1098                 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
 1099                     VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
 1100                     timespeccmp(&vattr.va_mtime, &nctime, ==)) {
 1101                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1102                         return (ENOENT);
 1103                 }
 1104                 cache_purge_negative(dvp);
 1105         }
 1106 
 1107         error = 0;
 1108         newvp = NULLVP;
 1109         NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
 1110         error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1111             cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1112             NULL);
 1113         if (dattrflag)
 1114                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1115         if (error) {
 1116                 if (newvp != NULLVP) {
 1117                         vput(newvp);
 1118                         *vpp = NULLVP;
 1119                 }
 1120 
 1121                 if (error != ENOENT) {
 1122                         if (NFS_ISV4(dvp))
 1123                                 error = nfscl_maperr(td, error, (uid_t)0,
 1124                                     (gid_t)0);
 1125                         return (error);
 1126                 }
 1127 
 1128                 /* The requested file was not found. */
 1129                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 1130                     (flags & ISLASTCN)) {
 1131                         /*
 1132                          * XXX: UFS does a full VOP_ACCESS(dvp,
 1133                          * VWRITE) here instead of just checking
 1134                          * MNT_RDONLY.
 1135                          */
 1136                         if (mp->mnt_flag & MNT_RDONLY)
 1137                                 return (EROFS);
 1138                         cnp->cn_flags |= SAVENAME;
 1139                         return (EJUSTRETURN);
 1140                 }
 1141 
 1142                 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE &&
 1143                     dattrflag) {
 1144                         /*
 1145                          * Cache the modification time of the parent
 1146                          * directory from the post-op attributes in
 1147                          * the name cache entry.  The negative cache
 1148                          * entry will be ignored once the directory
 1149                          * has changed.  Don't bother adding the entry
 1150                          * if the directory has already changed.
 1151                          */
 1152                         mtx_lock(&np->n_mtx);
 1153                         if (timespeccmp(&np->n_vattr.na_mtime,
 1154                             &dnfsva.na_mtime, ==)) {
 1155                                 mtx_unlock(&np->n_mtx);
 1156                                 cache_enter_time(dvp, NULL, cnp,
 1157                                     &dnfsva.na_mtime, NULL);
 1158                         } else
 1159                                 mtx_unlock(&np->n_mtx);
 1160                 }
 1161                 return (ENOENT);
 1162         }
 1163 
 1164         /*
 1165          * Handle RENAME case...
 1166          */
 1167         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 1168                 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1169                         FREE((caddr_t)nfhp, M_NFSFH);
 1170                         return (EISDIR);
 1171                 }
 1172                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1173                     LK_EXCLUSIVE);
 1174                 if (error)
 1175                         return (error);
 1176                 newvp = NFSTOV(np);
 1177                 if (attrflag)
 1178                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1179                             0, 1);
 1180                 *vpp = newvp;
 1181                 cnp->cn_flags |= SAVENAME;
 1182                 return (0);
 1183         }
 1184 
 1185         if (flags & ISDOTDOT) {
 1186                 ltype = NFSVOPISLOCKED(dvp);
 1187                 error = vfs_busy(mp, MBF_NOWAIT);
 1188                 if (error != 0) {
 1189                         vfs_ref(mp);
 1190                         NFSVOPUNLOCK(dvp, 0);
 1191                         error = vfs_busy(mp, 0);
 1192                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1193                         vfs_rel(mp);
 1194                         if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
 1195                                 vfs_unbusy(mp);
 1196                                 error = ENOENT;
 1197                         }
 1198                         if (error != 0)
 1199                                 return (error);
 1200                 }
 1201                 NFSVOPUNLOCK(dvp, 0);
 1202                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1203                     cnp->cn_lkflags);
 1204                 if (error == 0)
 1205                         newvp = NFSTOV(np);
 1206                 vfs_unbusy(mp);
 1207                 if (newvp != dvp)
 1208                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1209                 if (dvp->v_iflag & VI_DOOMED) {
 1210                         if (error == 0) {
 1211                                 if (newvp == dvp)
 1212                                         vrele(newvp);
 1213                                 else
 1214                                         vput(newvp);
 1215                         }
 1216                         error = ENOENT;
 1217                 }
 1218                 if (error != 0)
 1219                         return (error);
 1220                 if (attrflag)
 1221                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1222                             0, 1);
 1223         } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1224                 FREE((caddr_t)nfhp, M_NFSFH);
 1225                 VREF(dvp);
 1226                 newvp = dvp;
 1227                 if (attrflag)
 1228                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1229                             0, 1);
 1230         } else {
 1231                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1232                     cnp->cn_lkflags);
 1233                 if (error)
 1234                         return (error);
 1235                 newvp = NFSTOV(np);
 1236                 if (attrflag)
 1237                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1238                             0, 1);
 1239                 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1240                     !(np->n_flag & NMODIFIED)) {                        
 1241                         /*
 1242                          * Flush the attribute cache when opening a
 1243                          * leaf node to ensure that fresh attributes
 1244                          * are fetched in nfs_open() since we did not
 1245                          * fetch attributes from the LOOKUP reply.
 1246                          */
 1247                         mtx_lock(&np->n_mtx);
 1248                         np->n_attrstamp = 0;
 1249                         mtx_unlock(&np->n_mtx);
 1250                 }
 1251         }
 1252         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1253                 cnp->cn_flags |= SAVENAME;
 1254         if ((cnp->cn_flags & MAKEENTRY) &&
 1255             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
 1256             attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
 1257                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1258                     newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
 1259         *vpp = newvp;
 1260         return (0);
 1261 }
 1262 
 1263 /*
 1264  * nfs read call.
 1265  * Just call ncl_bioread() to do the work.
 1266  */
 1267 static int
 1268 nfs_read(struct vop_read_args *ap)
 1269 {
 1270         struct vnode *vp = ap->a_vp;
 1271 
 1272         switch (vp->v_type) {
 1273         case VREG:
 1274                 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1275         case VDIR:
 1276                 return (EISDIR);
 1277         default:
 1278                 return (EOPNOTSUPP);
 1279         }
 1280 }
 1281 
 1282 /*
 1283  * nfs readlink call
 1284  */
 1285 static int
 1286 nfs_readlink(struct vop_readlink_args *ap)
 1287 {
 1288         struct vnode *vp = ap->a_vp;
 1289 
 1290         if (vp->v_type != VLNK)
 1291                 return (EINVAL);
 1292         return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1293 }
 1294 
 1295 /*
 1296  * Do a readlink rpc.
 1297  * Called by ncl_doio() from below the buffer cache.
 1298  */
 1299 int
 1300 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1301 {
 1302         int error, ret, attrflag;
 1303         struct nfsvattr nfsva;
 1304 
 1305         error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
 1306             &attrflag, NULL);
 1307         if (attrflag) {
 1308                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1309                 if (ret && !error)
 1310                         error = ret;
 1311         }
 1312         if (error && NFS_ISV4(vp))
 1313                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1314         return (error);
 1315 }
 1316 
 1317 /*
 1318  * nfs read rpc call
 1319  * Ditto above
 1320  */
 1321 int
 1322 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1323 {
 1324         int error, ret, attrflag;
 1325         struct nfsvattr nfsva;
 1326 
 1327         error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, &attrflag,
 1328             NULL);
 1329         if (attrflag) {
 1330                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1331                 if (ret && !error)
 1332                         error = ret;
 1333         }
 1334         if (error && NFS_ISV4(vp))
 1335                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1336         return (error);
 1337 }
 1338 
 1339 /*
 1340  * nfs write call
 1341  */
 1342 int
 1343 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1344     int *iomode, int *must_commit, int called_from_strategy)
 1345 {
 1346         struct nfsvattr nfsva;
 1347         int error = 0, attrflag, ret;
 1348 
 1349         error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
 1350             uiop->uio_td, &nfsva, &attrflag, NULL, called_from_strategy);
 1351         if (attrflag) {
 1352                 if (VTONFS(vp)->n_flag & ND_NFSV4)
 1353                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
 1354                             1);
 1355                 else
 1356                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 1357                             1);
 1358                 if (ret && !error)
 1359                         error = ret;
 1360         }
 1361         if (DOINGASYNC(vp))
 1362                 *iomode = NFSWRITE_FILESYNC;
 1363         if (error && NFS_ISV4(vp))
 1364                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1365         return (error);
 1366 }
 1367 
 1368 /*
 1369  * nfs mknod rpc
 1370  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1371  * mode set to specify the file type and the size field for rdev.
 1372  */
 1373 static int
 1374 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1375     struct vattr *vap)
 1376 {
 1377         struct nfsvattr nfsva, dnfsva;
 1378         struct vnode *newvp = NULL;
 1379         struct nfsnode *np = NULL, *dnp;
 1380         struct nfsfh *nfhp;
 1381         struct vattr vattr;
 1382         int error = 0, attrflag, dattrflag;
 1383         u_int32_t rdev;
 1384 
 1385         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1386                 rdev = vap->va_rdev;
 1387         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1388                 rdev = 0xffffffff;
 1389         else
 1390                 return (EOPNOTSUPP);
 1391         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1392                 return (error);
 1393         error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
 1394             rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 1395             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 1396         if (!error) {
 1397                 if (!nfhp)
 1398                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1399                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1400                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1401                             NULL);
 1402                 if (nfhp)
 1403                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1404                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1405         }
 1406         if (dattrflag)
 1407                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1408         if (!error) {
 1409                 newvp = NFSTOV(np);
 1410                 if (attrflag != 0) {
 1411                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1412                             0, 1);
 1413                         if (error != 0)
 1414                                 vput(newvp);
 1415                 }
 1416         }
 1417         if (!error) {
 1418                 *vpp = newvp;
 1419         } else if (NFS_ISV4(dvp)) {
 1420                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1421                     vap->va_gid);
 1422         }
 1423         dnp = VTONFS(dvp);
 1424         mtx_lock(&dnp->n_mtx);
 1425         dnp->n_flag |= NMODIFIED;
 1426         if (!dattrflag)
 1427                 dnp->n_attrstamp = 0;
 1428         mtx_unlock(&dnp->n_mtx);
 1429         return (error);
 1430 }
 1431 
 1432 /*
 1433  * nfs mknod vop
 1434  * just call nfs_mknodrpc() to do the work.
 1435  */
 1436 /* ARGSUSED */
 1437 static int
 1438 nfs_mknod(struct vop_mknod_args *ap)
 1439 {
 1440         return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
 1441 }
 1442 
 1443 static u_long create_verf;
 1444 /*
 1445  * nfs file create call
 1446  */
 1447 static int
 1448 nfs_create(struct vop_create_args *ap)
 1449 {
 1450         struct vnode *dvp = ap->a_dvp;
 1451         struct vattr *vap = ap->a_vap;
 1452         struct componentname *cnp = ap->a_cnp;
 1453         struct nfsnode *np = NULL, *dnp;
 1454         struct vnode *newvp = NULL;
 1455         struct nfsmount *nmp;
 1456         struct nfsvattr dnfsva, nfsva;
 1457         struct nfsfh *nfhp;
 1458         nfsquad_t cverf;
 1459         int error = 0, attrflag, dattrflag, fmode = 0;
 1460         struct vattr vattr;
 1461 
 1462         /*
 1463          * Oops, not for me..
 1464          */
 1465         if (vap->va_type == VSOCK)
 1466                 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 1467 
 1468         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1469                 return (error);
 1470         if (vap->va_vaflags & VA_EXCLUSIVE)
 1471                 fmode |= O_EXCL;
 1472         dnp = VTONFS(dvp);
 1473         nmp = VFSTONFS(vnode_mount(dvp));
 1474 again:
 1475         /* For NFSv4, wait until any remove is done. */
 1476         mtx_lock(&dnp->n_mtx);
 1477         while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
 1478                 dnp->n_flag |= NREMOVEWANT;
 1479                 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
 1480         }
 1481         mtx_unlock(&dnp->n_mtx);
 1482 
 1483 #ifdef INET
 1484         CURVNET_SET(CRED_TO_VNET(cnp->cn_cred));
 1485         IN_IFADDR_RLOCK();
 1486         if (!TAILQ_EMPTY(&V_in_ifaddrhead))
 1487                 cverf.lval[0] = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr;
 1488         else
 1489 #endif
 1490                 cverf.lval[0] = create_verf;
 1491 #ifdef INET
 1492         IN_IFADDR_RUNLOCK();
 1493         CURVNET_RESTORE();
 1494 #endif
 1495         cverf.lval[1] = ++create_verf;
 1496         error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1497             vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
 1498             &nfhp, &attrflag, &dattrflag, NULL);
 1499         if (!error) {
 1500                 if (nfhp == NULL)
 1501                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1502                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1503                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1504                             NULL);
 1505                 if (nfhp != NULL)
 1506                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1507                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1508         }
 1509         if (dattrflag)
 1510                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1511         if (!error) {
 1512                 newvp = NFSTOV(np);
 1513                 if (attrflag == 0)
 1514                         error = nfsrpc_getattr(newvp, cnp->cn_cred,
 1515                             cnp->cn_thread, &nfsva, NULL);
 1516                 if (error == 0)
 1517                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1518                             0, 1);
 1519         }
 1520         if (error) {
 1521                 if (newvp != NULL) {
 1522                         vput(newvp);
 1523                         newvp = NULL;
 1524                 }
 1525                 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
 1526                     error == NFSERR_NOTSUPP) {
 1527                         fmode &= ~O_EXCL;
 1528                         goto again;
 1529                 }
 1530         } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
 1531                 if (nfscl_checksattr(vap, &nfsva)) {
 1532                         /*
 1533                          * We are normally called with only a partially
 1534                          * initialized VAP. Since the NFSv3 spec says that
 1535                          * the server may use the file attributes to
 1536                          * store the verifier, the spec requires us to do a
 1537                          * SETATTR RPC. FreeBSD servers store the verifier in
 1538                          * atime, but we can't really assume that all servers
 1539                          * will so we ensure that our SETATTR sets both atime
 1540                          * and mtime.
 1541                          */
 1542                         if (vap->va_mtime.tv_sec == VNOVAL)
 1543                                 vfs_timestamp(&vap->va_mtime);
 1544                         if (vap->va_atime.tv_sec == VNOVAL)
 1545                                 vap->va_atime = vap->va_mtime;
 1546                         error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
 1547                             cnp->cn_thread, &nfsva, &attrflag, NULL);
 1548                         if (error && (vap->va_uid != (uid_t)VNOVAL ||
 1549                             vap->va_gid != (gid_t)VNOVAL)) {
 1550                                 /* try again without setting uid/gid */
 1551                                 vap->va_uid = (uid_t)VNOVAL;
 1552                                 vap->va_gid = (uid_t)VNOVAL;
 1553                                 error = nfsrpc_setattr(newvp, vap, NULL, 
 1554                                     cnp->cn_cred, cnp->cn_thread, &nfsva,
 1555                                     &attrflag, NULL);
 1556                         }
 1557                         if (attrflag)
 1558                                 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 1559                                     NULL, 0, 1);
 1560                         if (error != 0)
 1561                                 vput(newvp);
 1562                 }
 1563         }
 1564         if (!error) {
 1565                 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
 1566                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1567                             NULL);
 1568                 *ap->a_vpp = newvp;
 1569         } else if (NFS_ISV4(dvp)) {
 1570                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1571                     vap->va_gid);
 1572         }
 1573         mtx_lock(&dnp->n_mtx);
 1574         dnp->n_flag |= NMODIFIED;
 1575         if (!dattrflag)
 1576                 dnp->n_attrstamp = 0;
 1577         mtx_unlock(&dnp->n_mtx);
 1578         return (error);
 1579 }
 1580 
 1581 /*
 1582  * nfs file remove call
 1583  * To try and make nfs semantics closer to ufs semantics, a file that has
 1584  * other processes using the vnode is renamed instead of removed and then
 1585  * removed later on the last close.
 1586  * - If v_usecount > 1
 1587  *        If a rename is not already in the works
 1588  *           call nfs_sillyrename() to set it up
 1589  *     else
 1590  *        do the remove rpc
 1591  */
 1592 static int
 1593 nfs_remove(struct vop_remove_args *ap)
 1594 {
 1595         struct vnode *vp = ap->a_vp;
 1596         struct vnode *dvp = ap->a_dvp;
 1597         struct componentname *cnp = ap->a_cnp;
 1598         struct nfsnode *np = VTONFS(vp);
 1599         int error = 0;
 1600         struct vattr vattr;
 1601 
 1602         KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
 1603         KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
 1604         if (vp->v_type == VDIR)
 1605                 error = EPERM;
 1606         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1607             VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
 1608             vattr.va_nlink > 1)) {
 1609                 /*
 1610                  * Purge the name cache so that the chance of a lookup for
 1611                  * the name succeeding while the remove is in progress is
 1612                  * minimized. Without node locking it can still happen, such
 1613                  * that an I/O op returns ESTALE, but since you get this if
 1614                  * another host removes the file..
 1615                  */
 1616                 cache_purge(vp);
 1617                 /*
 1618                  * throw away biocache buffers, mainly to avoid
 1619                  * unnecessary delayed writes later.
 1620                  */
 1621                 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1622                 /* Do the rpc */
 1623                 if (error != EINTR && error != EIO)
 1624                         error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
 1625                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1626                 /*
 1627                  * Kludge City: If the first reply to the remove rpc is lost..
 1628                  *   the reply to the retransmitted request will be ENOENT
 1629                  *   since the file was in fact removed
 1630                  *   Therefore, we cheat and return success.
 1631                  */
 1632                 if (error == ENOENT)
 1633                         error = 0;
 1634         } else if (!np->n_sillyrename)
 1635                 error = nfs_sillyrename(dvp, vp, cnp);
 1636         mtx_lock(&np->n_mtx);
 1637         np->n_attrstamp = 0;
 1638         mtx_unlock(&np->n_mtx);
 1639         return (error);
 1640 }
 1641 
 1642 /*
 1643  * nfs file remove rpc called from nfs_inactive
 1644  */
 1645 int
 1646 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
 1647 {
 1648         /*
 1649          * Make sure that the directory vnode is still valid.
 1650          * XXX we should lock sp->s_dvp here.
 1651          */
 1652         if (sp->s_dvp->v_type == VBAD)
 1653                 return (0);
 1654         return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
 1655             sp->s_cred, NULL));
 1656 }
 1657 
 1658 /*
 1659  * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
 1660  */
 1661 static int
 1662 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
 1663     int namelen, struct ucred *cred, struct thread *td)
 1664 {
 1665         struct nfsvattr dnfsva;
 1666         struct nfsnode *dnp = VTONFS(dvp);
 1667         int error = 0, dattrflag;
 1668 
 1669         mtx_lock(&dnp->n_mtx);
 1670         dnp->n_flag |= NREMOVEINPROG;
 1671         mtx_unlock(&dnp->n_mtx);
 1672         error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
 1673             &dattrflag, NULL);
 1674         mtx_lock(&dnp->n_mtx);
 1675         if ((dnp->n_flag & NREMOVEWANT)) {
 1676                 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
 1677                 mtx_unlock(&dnp->n_mtx);
 1678                 wakeup((caddr_t)dnp);
 1679         } else {
 1680                 dnp->n_flag &= ~NREMOVEINPROG;
 1681                 mtx_unlock(&dnp->n_mtx);
 1682         }
 1683         if (dattrflag)
 1684                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1685         mtx_lock(&dnp->n_mtx);
 1686         dnp->n_flag |= NMODIFIED;
 1687         if (!dattrflag)
 1688                 dnp->n_attrstamp = 0;
 1689         mtx_unlock(&dnp->n_mtx);
 1690         if (error && NFS_ISV4(dvp))
 1691                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1692         return (error);
 1693 }
 1694 
 1695 /*
 1696  * nfs file rename call
 1697  */
 1698 static int
 1699 nfs_rename(struct vop_rename_args *ap)
 1700 {
 1701         struct vnode *fvp = ap->a_fvp;
 1702         struct vnode *tvp = ap->a_tvp;
 1703         struct vnode *fdvp = ap->a_fdvp;
 1704         struct vnode *tdvp = ap->a_tdvp;
 1705         struct componentname *tcnp = ap->a_tcnp;
 1706         struct componentname *fcnp = ap->a_fcnp;
 1707         struct nfsnode *fnp = VTONFS(ap->a_fvp);
 1708         struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
 1709         struct nfsv4node *newv4 = NULL;
 1710         int error;
 1711 
 1712         KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
 1713             (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
 1714         /* Check for cross-device rename */
 1715         if ((fvp->v_mount != tdvp->v_mount) ||
 1716             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1717                 error = EXDEV;
 1718                 goto out;
 1719         }
 1720 
 1721         if (fvp == tvp) {
 1722                 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n");
 1723                 error = 0;
 1724                 goto out;
 1725         }
 1726         if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
 1727                 goto out;
 1728 
 1729         /*
 1730          * We have to flush B_DELWRI data prior to renaming
 1731          * the file.  If we don't, the delayed-write buffers
 1732          * can be flushed out later after the file has gone stale
 1733          * under NFSV3.  NFSV2 does not have this problem because
 1734          * ( as far as I can tell ) it flushes dirty buffers more
 1735          * often.
 1736          * 
 1737          * Skip the rename operation if the fsync fails, this can happen
 1738          * due to the server's volume being full, when we pushed out data
 1739          * that was written back to our cache earlier. Not checking for
 1740          * this condition can result in potential (silent) data loss.
 1741          */
 1742         error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1743         NFSVOPUNLOCK(fvp, 0);
 1744         if (!error && tvp)
 1745                 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1746         if (error)
 1747                 goto out;
 1748 
 1749         /*
 1750          * If the tvp exists and is in use, sillyrename it before doing the
 1751          * rename of the new file over it.
 1752          * XXX Can't sillyrename a directory.
 1753          */
 1754         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1755                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1756                 vput(tvp);
 1757                 tvp = NULL;
 1758         }
 1759 
 1760         error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1761             tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1762             tcnp->cn_thread);
 1763 
 1764         if (error == 0 && NFS_ISV4(tdvp)) {
 1765                 /*
 1766                  * For NFSv4, check to see if it is the same name and
 1767                  * replace the name, if it is different.
 1768                  */
 1769                 MALLOC(newv4, struct nfsv4node *,
 1770                     sizeof (struct nfsv4node) +
 1771                     tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
 1772                     M_NFSV4NODE, M_WAITOK);
 1773                 mtx_lock(&tdnp->n_mtx);
 1774                 mtx_lock(&fnp->n_mtx);
 1775                 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
 1776                     (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
 1777                       NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
 1778                       tcnp->cn_namelen) ||
 1779                       tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
 1780                       NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1781                         tdnp->n_fhp->nfh_len))) {
 1782 #ifdef notdef
 1783 { char nnn[100]; int nnnl;
 1784 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
 1785 bcopy(tcnp->cn_nameptr, nnn, nnnl);
 1786 nnn[nnnl] = '\0';
 1787 printf("ren replace=%s\n",nnn);
 1788 }
 1789 #endif
 1790                         FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
 1791                         fnp->n_v4 = newv4;
 1792                         newv4 = NULL;
 1793                         fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
 1794                         fnp->n_v4->n4_namelen = tcnp->cn_namelen;
 1795                         NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1796                             tdnp->n_fhp->nfh_len);
 1797                         NFSBCOPY(tcnp->cn_nameptr,
 1798                             NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
 1799                 }
 1800                 mtx_unlock(&tdnp->n_mtx);
 1801                 mtx_unlock(&fnp->n_mtx);
 1802                 if (newv4 != NULL)
 1803                         FREE((caddr_t)newv4, M_NFSV4NODE);
 1804         }
 1805 
 1806         if (fvp->v_type == VDIR) {
 1807                 if (tvp != NULL && tvp->v_type == VDIR)
 1808                         cache_purge(tdvp);
 1809                 cache_purge(fdvp);
 1810         }
 1811 
 1812 out:
 1813         if (tdvp == tvp)
 1814                 vrele(tdvp);
 1815         else
 1816                 vput(tdvp);
 1817         if (tvp)
 1818                 vput(tvp);
 1819         vrele(fdvp);
 1820         vrele(fvp);
 1821         /*
 1822          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1823          */
 1824         if (error == ENOENT)
 1825                 error = 0;
 1826         return (error);
 1827 }
 1828 
 1829 /*
 1830  * nfs file rename rpc called from nfs_remove() above
 1831  */
 1832 static int
 1833 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
 1834     struct sillyrename *sp)
 1835 {
 1836 
 1837         return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
 1838             sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
 1839             scnp->cn_thread));
 1840 }
 1841 
 1842 /*
 1843  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 1844  */
 1845 static int
 1846 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
 1847     int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
 1848     int tnamelen, struct ucred *cred, struct thread *td)
 1849 {
 1850         struct nfsvattr fnfsva, tnfsva;
 1851         struct nfsnode *fdnp = VTONFS(fdvp);
 1852         struct nfsnode *tdnp = VTONFS(tdvp);
 1853         int error = 0, fattrflag, tattrflag;
 1854 
 1855         error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
 1856             tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
 1857             &tattrflag, NULL, NULL);
 1858         mtx_lock(&fdnp->n_mtx);
 1859         fdnp->n_flag |= NMODIFIED;
 1860         if (fattrflag != 0) {
 1861                 mtx_unlock(&fdnp->n_mtx);
 1862                 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
 1863         } else {
 1864                 fdnp->n_attrstamp = 0;
 1865                 mtx_unlock(&fdnp->n_mtx);
 1866         }
 1867         mtx_lock(&tdnp->n_mtx);
 1868         tdnp->n_flag |= NMODIFIED;
 1869         if (tattrflag != 0) {
 1870                 mtx_unlock(&tdnp->n_mtx);
 1871                 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
 1872         } else {
 1873                 tdnp->n_attrstamp = 0;
 1874                 mtx_unlock(&tdnp->n_mtx);
 1875         }
 1876         if (error && NFS_ISV4(fdvp))
 1877                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1878         return (error);
 1879 }
 1880 
 1881 /*
 1882  * nfs hard link create call
 1883  */
 1884 static int
 1885 nfs_link(struct vop_link_args *ap)
 1886 {
 1887         struct vnode *vp = ap->a_vp;
 1888         struct vnode *tdvp = ap->a_tdvp;
 1889         struct componentname *cnp = ap->a_cnp;
 1890         struct nfsnode *np, *tdnp;
 1891         struct nfsvattr nfsva, dnfsva;
 1892         int error = 0, attrflag, dattrflag;
 1893 
 1894         if (vp->v_mount != tdvp->v_mount) {
 1895                 return (EXDEV);
 1896         }
 1897 
 1898         /*
 1899          * Push all writes to the server, so that the attribute cache
 1900          * doesn't get "out of sync" with the server.
 1901          * XXX There should be a better way!
 1902          */
 1903         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 1904 
 1905         error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
 1906             cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
 1907             &dattrflag, NULL);
 1908         tdnp = VTONFS(tdvp);
 1909         mtx_lock(&tdnp->n_mtx);
 1910         tdnp->n_flag |= NMODIFIED;
 1911         if (dattrflag != 0) {
 1912                 mtx_unlock(&tdnp->n_mtx);
 1913                 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
 1914         } else {
 1915                 tdnp->n_attrstamp = 0;
 1916                 mtx_unlock(&tdnp->n_mtx);
 1917         }
 1918         if (attrflag)
 1919                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1920         else {
 1921                 np = VTONFS(vp);
 1922                 mtx_lock(&np->n_mtx);
 1923                 np->n_attrstamp = 0;
 1924                 mtx_unlock(&np->n_mtx);
 1925         }
 1926         /*
 1927          * If negative lookup caching is enabled, I might as well
 1928          * add an entry for this node. Not necessary for correctness,
 1929          * but if negative caching is enabled, then the system
 1930          * must care about lookup caching hit rate, so...
 1931          */
 1932         if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
 1933             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 1934                 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
 1935         }
 1936         if (error && NFS_ISV4(vp))
 1937                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 1938                     (gid_t)0);
 1939         return (error);
 1940 }
 1941 
 1942 /*
 1943  * nfs symbolic link create call
 1944  */
 1945 static int
 1946 nfs_symlink(struct vop_symlink_args *ap)
 1947 {
 1948         struct vnode *dvp = ap->a_dvp;
 1949         struct vattr *vap = ap->a_vap;
 1950         struct componentname *cnp = ap->a_cnp;
 1951         struct nfsvattr nfsva, dnfsva;
 1952         struct nfsfh *nfhp;
 1953         struct nfsnode *np = NULL, *dnp;
 1954         struct vnode *newvp = NULL;
 1955         int error = 0, attrflag, dattrflag, ret;
 1956 
 1957         vap->va_type = VLNK;
 1958         error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1959             ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 1960             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 1961         if (nfhp) {
 1962                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 1963                     &np, NULL, LK_EXCLUSIVE);
 1964                 if (!ret)
 1965                         newvp = NFSTOV(np);
 1966                 else if (!error)
 1967                         error = ret;
 1968         }
 1969         if (newvp != NULL) {
 1970                 if (attrflag)
 1971                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1972                             0, 1);
 1973         } else if (!error) {
 1974                 /*
 1975                  * If we do not have an error and we could not extract the
 1976                  * newvp from the response due to the request being NFSv2, we
 1977                  * have to do a lookup in order to obtain a newvp to return.
 1978                  */
 1979                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1980                     cnp->cn_cred, cnp->cn_thread, &np);
 1981                 if (!error)
 1982                         newvp = NFSTOV(np);
 1983         }
 1984         if (error) {
 1985                 if (newvp)
 1986                         vput(newvp);
 1987                 if (NFS_ISV4(dvp))
 1988                         error = nfscl_maperr(cnp->cn_thread, error,
 1989                             vap->va_uid, vap->va_gid);
 1990         } else {
 1991                 *ap->a_vpp = newvp;
 1992         }
 1993 
 1994         dnp = VTONFS(dvp);
 1995         mtx_lock(&dnp->n_mtx);
 1996         dnp->n_flag |= NMODIFIED;
 1997         if (dattrflag != 0) {
 1998                 mtx_unlock(&dnp->n_mtx);
 1999                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2000         } else {
 2001                 dnp->n_attrstamp = 0;
 2002                 mtx_unlock(&dnp->n_mtx);
 2003         }
 2004         /*
 2005          * If negative lookup caching is enabled, I might as well
 2006          * add an entry for this node. Not necessary for correctness,
 2007          * but if negative caching is enabled, then the system
 2008          * must care about lookup caching hit rate, so...
 2009          */
 2010         if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2011             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 2012                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
 2013         }
 2014         return (error);
 2015 }
 2016 
 2017 /*
 2018  * nfs make dir call
 2019  */
 2020 static int
 2021 nfs_mkdir(struct vop_mkdir_args *ap)
 2022 {
 2023         struct vnode *dvp = ap->a_dvp;
 2024         struct vattr *vap = ap->a_vap;
 2025         struct componentname *cnp = ap->a_cnp;
 2026         struct nfsnode *np = NULL, *dnp;
 2027         struct vnode *newvp = NULL;
 2028         struct vattr vattr;
 2029         struct nfsfh *nfhp;
 2030         struct nfsvattr nfsva, dnfsva;
 2031         int error = 0, attrflag, dattrflag, ret;
 2032 
 2033         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
 2034                 return (error);
 2035         vap->va_type = VDIR;
 2036         error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2037             vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
 2038             &attrflag, &dattrflag, NULL);
 2039         dnp = VTONFS(dvp);
 2040         mtx_lock(&dnp->n_mtx);
 2041         dnp->n_flag |= NMODIFIED;
 2042         if (dattrflag != 0) {
 2043                 mtx_unlock(&dnp->n_mtx);
 2044                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2045         } else {
 2046                 dnp->n_attrstamp = 0;
 2047                 mtx_unlock(&dnp->n_mtx);
 2048         }
 2049         if (nfhp) {
 2050                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2051                     &np, NULL, LK_EXCLUSIVE);
 2052                 if (!ret) {
 2053                         newvp = NFSTOV(np);
 2054                         if (attrflag)
 2055                            (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 2056                                 NULL, 0, 1);
 2057                 } else if (!error)
 2058                         error = ret;
 2059         }
 2060         if (!error && newvp == NULL) {
 2061                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2062                     cnp->cn_cred, cnp->cn_thread, &np);
 2063                 if (!error) {
 2064                         newvp = NFSTOV(np);
 2065                         if (newvp->v_type != VDIR)
 2066                                 error = EEXIST;
 2067                 }
 2068         }
 2069         if (error) {
 2070                 if (newvp)
 2071                         vput(newvp);
 2072                 if (NFS_ISV4(dvp))
 2073                         error = nfscl_maperr(cnp->cn_thread, error,
 2074                             vap->va_uid, vap->va_gid);
 2075         } else {
 2076                 /*
 2077                  * If negative lookup caching is enabled, I might as well
 2078                  * add an entry for this node. Not necessary for correctness,
 2079                  * but if negative caching is enabled, then the system
 2080                  * must care about lookup caching hit rate, so...
 2081                  */
 2082                 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2083                     (cnp->cn_flags & MAKEENTRY) &&
 2084                     attrflag != 0 && dattrflag != 0)
 2085                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 2086                             &dnfsva.na_ctime);
 2087                 *ap->a_vpp = newvp;
 2088         }
 2089         return (error);
 2090 }
 2091 
 2092 /*
 2093  * nfs remove directory call
 2094  */
 2095 static int
 2096 nfs_rmdir(struct vop_rmdir_args *ap)
 2097 {
 2098         struct vnode *vp = ap->a_vp;
 2099         struct vnode *dvp = ap->a_dvp;
 2100         struct componentname *cnp = ap->a_cnp;
 2101         struct nfsnode *dnp;
 2102         struct nfsvattr dnfsva;
 2103         int error, dattrflag;
 2104 
 2105         if (dvp == vp)
 2106                 return (EINVAL);
 2107         error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2108             cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
 2109         dnp = VTONFS(dvp);
 2110         mtx_lock(&dnp->n_mtx);
 2111         dnp->n_flag |= NMODIFIED;
 2112         if (dattrflag != 0) {
 2113                 mtx_unlock(&dnp->n_mtx);
 2114                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2115         } else {
 2116                 dnp->n_attrstamp = 0;
 2117                 mtx_unlock(&dnp->n_mtx);
 2118         }
 2119 
 2120         cache_purge(dvp);
 2121         cache_purge(vp);
 2122         if (error && NFS_ISV4(dvp))
 2123                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2124                     (gid_t)0);
 2125         /*
 2126          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 2127          */
 2128         if (error == ENOENT)
 2129                 error = 0;
 2130         return (error);
 2131 }
 2132 
 2133 /*
 2134  * nfs readdir call
 2135  */
 2136 static int
 2137 nfs_readdir(struct vop_readdir_args *ap)
 2138 {
 2139         struct vnode *vp = ap->a_vp;
 2140         struct nfsnode *np = VTONFS(vp);
 2141         struct uio *uio = ap->a_uio;
 2142         int tresid, error = 0;
 2143         struct vattr vattr;
 2144         
 2145         if (vp->v_type != VDIR) 
 2146                 return(EPERM);
 2147 
 2148         /*
 2149          * First, check for hit on the EOF offset cache
 2150          */
 2151         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 2152             (np->n_flag & NMODIFIED) == 0) {
 2153                 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
 2154                         mtx_lock(&np->n_mtx);
 2155                         if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
 2156                             !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 2157                                 mtx_unlock(&np->n_mtx);
 2158                                 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
 2159                                 return (0);
 2160                         } else
 2161                                 mtx_unlock(&np->n_mtx);
 2162                 }
 2163         }
 2164 
 2165         /*
 2166          * Call ncl_bioread() to do the real work.
 2167          */
 2168         tresid = uio->uio_resid;
 2169         error = ncl_bioread(vp, uio, 0, ap->a_cred);
 2170 
 2171         if (!error && uio->uio_resid == tresid)
 2172                 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
 2173         return (error);
 2174 }
 2175 
 2176 /*
 2177  * Readdir rpc call.
 2178  * Called from below the buffer cache by ncl_doio().
 2179  */
 2180 int
 2181 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2182     struct thread *td)
 2183 {
 2184         struct nfsvattr nfsva;
 2185         nfsuint64 *cookiep, cookie;
 2186         struct nfsnode *dnp = VTONFS(vp);
 2187         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2188         int error = 0, eof, attrflag;
 2189 
 2190         KASSERT(uiop->uio_iovcnt == 1 &&
 2191             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2192             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2193             ("nfs readdirrpc bad uio"));
 2194 
 2195         /*
 2196          * If there is no cookie, assume directory was stale.
 2197          */
 2198         ncl_dircookie_lock(dnp);
 2199         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2200         if (cookiep) {
 2201                 cookie = *cookiep;
 2202                 ncl_dircookie_unlock(dnp);
 2203         } else {
 2204                 ncl_dircookie_unlock(dnp);              
 2205                 return (NFSERR_BAD_COOKIE);
 2206         }
 2207 
 2208         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2209                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2210 
 2211         error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
 2212             &attrflag, &eof, NULL);
 2213         if (attrflag)
 2214                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2215 
 2216         if (!error) {
 2217                 /*
 2218                  * We are now either at the end of the directory or have filled
 2219                  * the block.
 2220                  */
 2221                 if (eof)
 2222                         dnp->n_direofoffset = uiop->uio_offset;
 2223                 else {
 2224                         if (uiop->uio_resid > 0)
 2225                                 ncl_printf("EEK! readdirrpc resid > 0\n");
 2226                         ncl_dircookie_lock(dnp);
 2227                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2228                         *cookiep = cookie;
 2229                         ncl_dircookie_unlock(dnp);
 2230                 }
 2231         } else if (NFS_ISV4(vp)) {
 2232                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2233         }
 2234         return (error);
 2235 }
 2236 
 2237 /*
 2238  * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
 2239  */
 2240 int
 2241 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2242     struct thread *td)
 2243 {
 2244         struct nfsvattr nfsva;
 2245         nfsuint64 *cookiep, cookie;
 2246         struct nfsnode *dnp = VTONFS(vp);
 2247         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2248         int error = 0, attrflag, eof;
 2249 
 2250         KASSERT(uiop->uio_iovcnt == 1 &&
 2251             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2252             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2253             ("nfs readdirplusrpc bad uio"));
 2254 
 2255         /*
 2256          * If there is no cookie, assume directory was stale.
 2257          */
 2258         ncl_dircookie_lock(dnp);
 2259         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2260         if (cookiep) {
 2261                 cookie = *cookiep;
 2262                 ncl_dircookie_unlock(dnp);
 2263         } else {
 2264                 ncl_dircookie_unlock(dnp);
 2265                 return (NFSERR_BAD_COOKIE);
 2266         }
 2267 
 2268         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2269                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2270         error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
 2271             &attrflag, &eof, NULL);
 2272         if (attrflag)
 2273                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2274 
 2275         if (!error) {
 2276                 /*
 2277                  * We are now either at end of the directory or have filled the
 2278                  * the block.
 2279                  */
 2280                 if (eof)
 2281                         dnp->n_direofoffset = uiop->uio_offset;
 2282                 else {
 2283                         if (uiop->uio_resid > 0)
 2284                                 ncl_printf("EEK! readdirplusrpc resid > 0\n");
 2285                         ncl_dircookie_lock(dnp);
 2286                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2287                         *cookiep = cookie;
 2288                         ncl_dircookie_unlock(dnp);
 2289                 }
 2290         } else if (NFS_ISV4(vp)) {
 2291                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2292         }
 2293         return (error);
 2294 }
 2295 
 2296 /*
 2297  * Silly rename. To make the NFS filesystem that is stateless look a little
 2298  * more like the "ufs" a remove of an active vnode is translated to a rename
 2299  * to a funny looking filename that is removed by nfs_inactive on the
 2300  * nfsnode. There is the potential for another process on a different client
 2301  * to create the same funny name between the nfs_lookitup() fails and the
 2302  * nfs_rename() completes, but...
 2303  */
 2304 static int
 2305 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2306 {
 2307         struct sillyrename *sp;
 2308         struct nfsnode *np;
 2309         int error;
 2310         short pid;
 2311         unsigned int lticks;
 2312 
 2313         cache_purge(dvp);
 2314         np = VTONFS(vp);
 2315         KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
 2316         MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
 2317             M_NEWNFSREQ, M_WAITOK);
 2318         sp->s_cred = crhold(cnp->cn_cred);
 2319         sp->s_dvp = dvp;
 2320         VREF(dvp);
 2321 
 2322         /* 
 2323          * Fudge together a funny name.
 2324          * Changing the format of the funny name to accomodate more 
 2325          * sillynames per directory.
 2326          * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 
 2327          * CPU ticks since boot.
 2328          */
 2329         pid = cnp->cn_thread->td_proc->p_pid;
 2330         lticks = (unsigned int)ticks;
 2331         for ( ; ; ) {
 2332                 sp->s_namlen = sprintf(sp->s_name, 
 2333                                        ".nfs.%08x.%04x4.4", lticks, 
 2334                                        pid);
 2335                 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2336                                  cnp->cn_thread, NULL))
 2337                         break;
 2338                 lticks++;
 2339         }
 2340         error = nfs_renameit(dvp, vp, cnp, sp);
 2341         if (error)
 2342                 goto bad;
 2343         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2344                 cnp->cn_thread, &np);
 2345         np->n_sillyrename = sp;
 2346         return (0);
 2347 bad:
 2348         vrele(sp->s_dvp);
 2349         crfree(sp->s_cred);
 2350         free((caddr_t)sp, M_NEWNFSREQ);
 2351         return (error);
 2352 }
 2353 
 2354 /*
 2355  * Look up a file name and optionally either update the file handle or
 2356  * allocate an nfsnode, depending on the value of npp.
 2357  * npp == NULL  --> just do the lookup
 2358  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2359  *                      handled too
 2360  * *npp != NULL --> update the file handle in the vnode
 2361  */
 2362 static int
 2363 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
 2364     struct thread *td, struct nfsnode **npp)
 2365 {
 2366         struct vnode *newvp = NULL, *vp;
 2367         struct nfsnode *np, *dnp = VTONFS(dvp);
 2368         struct nfsfh *nfhp, *onfhp;
 2369         struct nfsvattr nfsva, dnfsva;
 2370         struct componentname cn;
 2371         int error = 0, attrflag, dattrflag;
 2372         u_int hash;
 2373 
 2374         error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
 2375             &nfhp, &attrflag, &dattrflag, NULL);
 2376         if (dattrflag)
 2377                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2378         if (npp && !error) {
 2379                 if (*npp != NULL) {
 2380                     np = *npp;
 2381                     vp = NFSTOV(np);
 2382                     /*
 2383                      * For NFSv4, check to see if it is the same name and
 2384                      * replace the name, if it is different.
 2385                      */
 2386                     if (np->n_v4 != NULL && nfsva.na_type == VREG &&
 2387                         (np->n_v4->n4_namelen != len ||
 2388                          NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
 2389                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
 2390                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2391                          dnp->n_fhp->nfh_len))) {
 2392 #ifdef notdef
 2393 { char nnn[100]; int nnnl;
 2394 nnnl = (len < 100) ? len : 99;
 2395 bcopy(name, nnn, nnnl);
 2396 nnn[nnnl] = '\0';
 2397 printf("replace=%s\n",nnn);
 2398 }
 2399 #endif
 2400                             FREE((caddr_t)np->n_v4, M_NFSV4NODE);
 2401                             MALLOC(np->n_v4, struct nfsv4node *,
 2402                                 sizeof (struct nfsv4node) +
 2403                                 dnp->n_fhp->nfh_len + len - 1,
 2404                                 M_NFSV4NODE, M_WAITOK);
 2405                             np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
 2406                             np->n_v4->n4_namelen = len;
 2407                             NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2408                                 dnp->n_fhp->nfh_len);
 2409                             NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
 2410                     }
 2411                     hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
 2412                         FNV1_32_INIT);
 2413                     onfhp = np->n_fhp;
 2414                     /*
 2415                      * Rehash node for new file handle.
 2416                      */
 2417                     vfs_hash_rehash(vp, hash);
 2418                     np->n_fhp = nfhp;
 2419                     if (onfhp != NULL)
 2420                         FREE((caddr_t)onfhp, M_NFSFH);
 2421                     newvp = NFSTOV(np);
 2422                 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
 2423                     FREE((caddr_t)nfhp, M_NFSFH);
 2424                     VREF(dvp);
 2425                     newvp = dvp;
 2426                 } else {
 2427                     cn.cn_nameptr = name;
 2428                     cn.cn_namelen = len;
 2429                     error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
 2430                         &np, NULL, LK_EXCLUSIVE);
 2431                     if (error)
 2432                         return (error);
 2433                     newvp = NFSTOV(np);
 2434                 }
 2435                 if (!attrflag && *npp == NULL) {
 2436                         if (newvp == dvp)
 2437                                 vrele(newvp);
 2438                         else
 2439                                 vput(newvp);
 2440                         return (ENOENT);
 2441                 }
 2442                 if (attrflag)
 2443                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2444                             0, 1);
 2445         }
 2446         if (npp && *npp == NULL) {
 2447                 if (error) {
 2448                         if (newvp) {
 2449                                 if (newvp == dvp)
 2450                                         vrele(newvp);
 2451                                 else
 2452                                         vput(newvp);
 2453                         }
 2454                 } else
 2455                         *npp = np;
 2456         }
 2457         if (error && NFS_ISV4(dvp))
 2458                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2459         return (error);
 2460 }
 2461 
 2462 /*
 2463  * Nfs Version 3 and 4 commit rpc
 2464  */
 2465 int
 2466 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2467    struct thread *td)
 2468 {
 2469         struct nfsvattr nfsva;
 2470         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2471         int error, attrflag;
 2472         u_char verf[NFSX_VERF];
 2473 
 2474         mtx_lock(&nmp->nm_mtx);
 2475         if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
 2476                 mtx_unlock(&nmp->nm_mtx);
 2477                 return (0);
 2478         }
 2479         mtx_unlock(&nmp->nm_mtx);
 2480         error = nfsrpc_commit(vp, offset, cnt, cred, td, verf, &nfsva,
 2481             &attrflag, NULL);
 2482         if (!error) {
 2483                 mtx_lock(&nmp->nm_mtx);
 2484                 if (NFSBCMP((caddr_t)nmp->nm_verf, verf, NFSX_VERF)) {
 2485                         NFSBCOPY(verf, (caddr_t)nmp->nm_verf, NFSX_VERF);
 2486                         error = NFSERR_STALEWRITEVERF;
 2487                 }
 2488                 mtx_unlock(&nmp->nm_mtx);
 2489                 if (!error && attrflag)
 2490                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
 2491                             0, 1);
 2492         } else if (NFS_ISV4(vp)) {
 2493                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2494         }
 2495         return (error);
 2496 }
 2497 
 2498 /*
 2499  * Strategy routine.
 2500  * For async requests when nfsiod(s) are running, queue the request by
 2501  * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
 2502  * request.
 2503  */
 2504 static int
 2505 nfs_strategy(struct vop_strategy_args *ap)
 2506 {
 2507         struct buf *bp = ap->a_bp;
 2508         struct ucred *cr;
 2509 
 2510         KASSERT(!(bp->b_flags & B_DONE),
 2511             ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2512         BUF_ASSERT_HELD(bp);
 2513 
 2514         if (bp->b_iocmd == BIO_READ)
 2515                 cr = bp->b_rcred;
 2516         else
 2517                 cr = bp->b_wcred;
 2518 
 2519         /*
 2520          * If the op is asynchronous and an i/o daemon is waiting
 2521          * queue the request, wake it up and wait for completion
 2522          * otherwise just do it ourselves.
 2523          */
 2524         if ((bp->b_flags & B_ASYNC) == 0 ||
 2525             ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
 2526                 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
 2527         return (0);
 2528 }
 2529 
 2530 /*
 2531  * fsync vnode op. Just call ncl_flush() with commit == 1.
 2532  */
 2533 /* ARGSUSED */
 2534 static int
 2535 nfs_fsync(struct vop_fsync_args *ap)
 2536 {
 2537 
 2538         if (ap->a_vp->v_type != VREG) {
 2539                 /*
 2540                  * For NFS, metadata is changed synchronously on the server,
 2541                  * so there is nothing to flush. Also, ncl_flush() clears
 2542                  * the NMODIFIED flag and that shouldn't be done here for
 2543                  * directories.
 2544                  */
 2545                 return (0);
 2546         }
 2547         return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0));
 2548 }
 2549 
 2550 /*
 2551  * Flush all the blocks associated with a vnode.
 2552  *      Walk through the buffer pool and push any dirty pages
 2553  *      associated with the vnode.
 2554  * If the called_from_renewthread argument is TRUE, it has been called
 2555  * from the NFSv4 renew thread and, as such, cannot block indefinitely
 2556  * waiting for a buffer write to complete.
 2557  */
 2558 int
 2559 ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td,
 2560     int commit, int called_from_renewthread)
 2561 {
 2562         struct nfsnode *np = VTONFS(vp);
 2563         struct buf *bp;
 2564         int i;
 2565         struct buf *nbp;
 2566         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2567         int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2568         int passone = 1, trycnt = 0;
 2569         u_quad_t off, endoff, toff;
 2570         struct ucred* wcred = NULL;
 2571         struct buf **bvec = NULL;
 2572         struct bufobj *bo;
 2573 #ifndef NFS_COMMITBVECSIZ
 2574 #define NFS_COMMITBVECSIZ       20
 2575 #endif
 2576         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2577         int bvecsize = 0, bveccount;
 2578 
 2579         if (called_from_renewthread != 0)
 2580                 slptimeo = hz;
 2581         if (nmp->nm_flag & NFSMNT_INT)
 2582                 slpflag = NFS_PCATCH;
 2583         if (!commit)
 2584                 passone = 0;
 2585         bo = &vp->v_bufobj;
 2586         /*
 2587          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2588          * server, but has not been committed to stable storage on the server
 2589          * yet. On the first pass, the byte range is worked out and the commit
 2590          * rpc is done. On the second pass, ncl_writebp() is called to do the
 2591          * job.
 2592          */
 2593 again:
 2594         off = (u_quad_t)-1;
 2595         endoff = 0;
 2596         bvecpos = 0;
 2597         if (NFS_ISV34(vp) && commit) {
 2598                 if (bvec != NULL && bvec != bvec_on_stack)
 2599                         free(bvec, M_TEMP);
 2600                 /*
 2601                  * Count up how many buffers waiting for a commit.
 2602                  */
 2603                 bveccount = 0;
 2604                 BO_LOCK(bo);
 2605                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2606                         if (!BUF_ISLOCKED(bp) &&
 2607                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2608                                 == (B_DELWRI | B_NEEDCOMMIT))
 2609                                 bveccount++;
 2610                 }
 2611                 /*
 2612                  * Allocate space to remember the list of bufs to commit.  It is
 2613                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 2614                  * If we can't get memory (for whatever reason), we will end up
 2615                  * committing the buffers one-by-one in the loop below.
 2616                  */
 2617                 if (bveccount > NFS_COMMITBVECSIZ) {
 2618                         /*
 2619                          * Release the vnode interlock to avoid a lock
 2620                          * order reversal.
 2621                          */
 2622                         BO_UNLOCK(bo);
 2623                         bvec = (struct buf **)
 2624                                 malloc(bveccount * sizeof(struct buf *),
 2625                                        M_TEMP, M_NOWAIT);
 2626                         BO_LOCK(bo);
 2627                         if (bvec == NULL) {
 2628                                 bvec = bvec_on_stack;
 2629                                 bvecsize = NFS_COMMITBVECSIZ;
 2630                         } else
 2631                                 bvecsize = bveccount;
 2632                 } else {
 2633                         bvec = bvec_on_stack;
 2634                         bvecsize = NFS_COMMITBVECSIZ;
 2635                 }
 2636                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2637                         if (bvecpos >= bvecsize)
 2638                                 break;
 2639                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2640                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2641                                 continue;
 2642                         }
 2643                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2644                             (B_DELWRI | B_NEEDCOMMIT)) {
 2645                                 BUF_UNLOCK(bp);
 2646                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2647                                 continue;
 2648                         }
 2649                         BO_UNLOCK(bo);
 2650                         bremfree(bp);
 2651                         /*
 2652                          * Work out if all buffers are using the same cred
 2653                          * so we can deal with them all with one commit.
 2654                          *
 2655                          * NOTE: we are not clearing B_DONE here, so we have
 2656                          * to do it later on in this routine if we intend to
 2657                          * initiate I/O on the bp.
 2658                          *
 2659                          * Note: to avoid loopback deadlocks, we do not
 2660                          * assign b_runningbufspace.
 2661                          */
 2662                         if (wcred == NULL)
 2663                                 wcred = bp->b_wcred;
 2664                         else if (wcred != bp->b_wcred)
 2665                                 wcred = NOCRED;
 2666                         vfs_busy_pages(bp, 1);
 2667 
 2668                         BO_LOCK(bo);
 2669                         /*
 2670                          * bp is protected by being locked, but nbp is not
 2671                          * and vfs_busy_pages() may sleep.  We have to
 2672                          * recalculate nbp.
 2673                          */
 2674                         nbp = TAILQ_NEXT(bp, b_bobufs);
 2675 
 2676                         /*
 2677                          * A list of these buffers is kept so that the
 2678                          * second loop knows which buffers have actually
 2679                          * been committed. This is necessary, since there
 2680                          * may be a race between the commit rpc and new
 2681                          * uncommitted writes on the file.
 2682                          */
 2683                         bvec[bvecpos++] = bp;
 2684                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2685                                 bp->b_dirtyoff;
 2686                         if (toff < off)
 2687                                 off = toff;
 2688                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2689                         if (toff > endoff)
 2690                                 endoff = toff;
 2691                 }
 2692                 BO_UNLOCK(bo);
 2693         }
 2694         if (bvecpos > 0) {
 2695                 /*
 2696                  * Commit data on the server, as required.
 2697                  * If all bufs are using the same wcred, then use that with
 2698                  * one call for all of them, otherwise commit each one
 2699                  * separately.
 2700                  */
 2701                 if (wcred != NOCRED)
 2702                         retv = ncl_commit(vp, off, (int)(endoff - off),
 2703                                           wcred, td);
 2704                 else {
 2705                         retv = 0;
 2706                         for (i = 0; i < bvecpos; i++) {
 2707                                 off_t off, size;
 2708                                 bp = bvec[i];
 2709                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2710                                         bp->b_dirtyoff;
 2711                                 size = (u_quad_t)(bp->b_dirtyend
 2712                                                   - bp->b_dirtyoff);
 2713                                 retv = ncl_commit(vp, off, (int)size,
 2714                                                   bp->b_wcred, td);
 2715                                 if (retv) break;
 2716                         }
 2717                 }
 2718 
 2719                 if (retv == NFSERR_STALEWRITEVERF)
 2720                         ncl_clearcommit(vp->v_mount);
 2721 
 2722                 /*
 2723                  * Now, either mark the blocks I/O done or mark the
 2724                  * blocks dirty, depending on whether the commit
 2725                  * succeeded.
 2726                  */
 2727                 for (i = 0; i < bvecpos; i++) {
 2728                         bp = bvec[i];
 2729                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 2730                         if (retv) {
 2731                                 /*
 2732                                  * Error, leave B_DELWRI intact
 2733                                  */
 2734                                 vfs_unbusy_pages(bp);
 2735                                 brelse(bp);
 2736                         } else {
 2737                                 /*
 2738                                  * Success, remove B_DELWRI ( bundirty() ).
 2739                                  *
 2740                                  * b_dirtyoff/b_dirtyend seem to be NFS
 2741                                  * specific.  We should probably move that
 2742                                  * into bundirty(). XXX
 2743                                  */
 2744                                 bufobj_wref(bo);
 2745                                 bp->b_flags |= B_ASYNC;
 2746                                 bundirty(bp);
 2747                                 bp->b_flags &= ~B_DONE;
 2748                                 bp->b_ioflags &= ~BIO_ERROR;
 2749                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2750                                 bufdone(bp);
 2751                         }
 2752                 }
 2753         }
 2754 
 2755         /*
 2756          * Start/do any write(s) that are required.
 2757          */
 2758 loop:
 2759         BO_LOCK(bo);
 2760         TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2761                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2762                         if (waitfor != MNT_WAIT || passone)
 2763                                 continue;
 2764 
 2765                         error = BUF_TIMELOCK(bp,
 2766                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 2767                             BO_MTX(bo), "nfsfsync", slpflag, slptimeo);
 2768                         if (error == 0) {
 2769                                 BUF_UNLOCK(bp);
 2770                                 goto loop;
 2771                         }
 2772                         if (error == ENOLCK) {
 2773                                 error = 0;
 2774                                 goto loop;
 2775                         }
 2776                         if (called_from_renewthread != 0) {
 2777                                 /*
 2778                                  * Return EIO so the flush will be retried
 2779                                  * later.
 2780                                  */
 2781                                 error = EIO;
 2782                                 goto done;
 2783                         }
 2784                         if (newnfs_sigintr(nmp, td)) {
 2785                                 error = EINTR;
 2786                                 goto done;
 2787                         }
 2788                         if (slpflag & PCATCH) {
 2789                                 slpflag = 0;
 2790                                 slptimeo = 2 * hz;
 2791                         }
 2792                         goto loop;
 2793                 }
 2794                 if ((bp->b_flags & B_DELWRI) == 0)
 2795                         panic("nfs_fsync: not dirty");
 2796                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 2797                         BUF_UNLOCK(bp);
 2798                         continue;
 2799                 }
 2800                 BO_UNLOCK(bo);
 2801                 bremfree(bp);
 2802                 if (passone || !commit)
 2803                     bp->b_flags |= B_ASYNC;
 2804                 else
 2805                     bp->b_flags |= B_ASYNC;
 2806                 bwrite(bp);
 2807                 if (newnfs_sigintr(nmp, td)) {
 2808                         error = EINTR;
 2809                         goto done;
 2810                 }
 2811                 goto loop;
 2812         }
 2813         if (passone) {
 2814                 passone = 0;
 2815                 BO_UNLOCK(bo);
 2816                 goto again;
 2817         }
 2818         if (waitfor == MNT_WAIT) {
 2819                 while (bo->bo_numoutput) {
 2820                         error = bufobj_wwait(bo, slpflag, slptimeo);
 2821                         if (error) {
 2822                             BO_UNLOCK(bo);
 2823                             if (called_from_renewthread != 0) {
 2824                                 /*
 2825                                  * Return EIO so that the flush will be
 2826                                  * retried later.
 2827                                  */
 2828                                 error = EIO;
 2829                                 goto done;
 2830                             }
 2831                             error = newnfs_sigintr(nmp, td);
 2832                             if (error)
 2833                                 goto done;
 2834                             if (slpflag & PCATCH) {
 2835                                 slpflag = 0;
 2836                                 slptimeo = 2 * hz;
 2837                             }
 2838                             BO_LOCK(bo);
 2839                         }
 2840                 }
 2841                 if (bo->bo_dirty.bv_cnt != 0 && commit) {
 2842                         BO_UNLOCK(bo);
 2843                         goto loop;
 2844                 }
 2845                 /*
 2846                  * Wait for all the async IO requests to drain
 2847                  */
 2848                 BO_UNLOCK(bo);
 2849                 mtx_lock(&np->n_mtx);
 2850                 while (np->n_directio_asyncwr > 0) {
 2851                         np->n_flag |= NFSYNCWAIT;
 2852                         error = newnfs_msleep(td, &np->n_directio_asyncwr,
 2853                             &np->n_mtx, slpflag | (PRIBIO + 1), 
 2854                             "nfsfsync", 0);
 2855                         if (error) {
 2856                                 if (newnfs_sigintr(nmp, td)) {
 2857                                         mtx_unlock(&np->n_mtx);
 2858                                         error = EINTR;  
 2859                                         goto done;
 2860                                 }
 2861                         }
 2862                 }
 2863                 mtx_unlock(&np->n_mtx);
 2864         } else
 2865                 BO_UNLOCK(bo);
 2866         mtx_lock(&np->n_mtx);
 2867         if (np->n_flag & NWRITEERR) {
 2868                 error = np->n_error;
 2869                 np->n_flag &= ~NWRITEERR;
 2870         }
 2871         if (commit && bo->bo_dirty.bv_cnt == 0 &&
 2872             bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
 2873                 np->n_flag &= ~NMODIFIED;
 2874         mtx_unlock(&np->n_mtx);
 2875 done:
 2876         if (bvec != NULL && bvec != bvec_on_stack)
 2877                 free(bvec, M_TEMP);
 2878         if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
 2879             (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
 2880              np->n_directio_asyncwr != 0) && trycnt++ < 5) {
 2881                 /* try, try again... */
 2882                 passone = 1;
 2883                 wcred = NULL;
 2884                 bvec = NULL;
 2885                 bvecsize = 0;
 2886 printf("try%d\n", trycnt);
 2887                 goto again;
 2888         }
 2889         return (error);
 2890 }
 2891 
 2892 /*
 2893  * NFS advisory byte-level locks.
 2894  */
 2895 static int
 2896 nfs_advlock(struct vop_advlock_args *ap)
 2897 {
 2898         struct vnode *vp = ap->a_vp;
 2899         struct ucred *cred;
 2900         struct nfsnode *np = VTONFS(ap->a_vp);
 2901         struct proc *p = (struct proc *)ap->a_id;
 2902         struct thread *td = curthread;  /* XXX */
 2903         struct vattr va;
 2904         int ret, error = EOPNOTSUPP;
 2905         u_quad_t size;
 2906         
 2907         if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
 2908                 if (vp->v_type != VREG)
 2909                         return (EINVAL);
 2910                 if ((ap->a_flags & F_POSIX) != 0)
 2911                         cred = p->p_ucred;
 2912                 else
 2913                         cred = td->td_ucred;
 2914                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 2915                 if (vp->v_iflag & VI_DOOMED) {
 2916                         NFSVOPUNLOCK(vp, 0);
 2917                         return (EBADF);
 2918                 }
 2919 
 2920                 /*
 2921                  * If this is unlocking a write locked region, flush and
 2922                  * commit them before unlocking. This is required by
 2923                  * RFC3530 Sec. 9.3.2.
 2924                  */
 2925                 if (ap->a_op == F_UNLCK &&
 2926                     nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
 2927                     ap->a_flags))
 2928                         (void) ncl_flush(vp, MNT_WAIT, cred, td, 1, 0);
 2929 
 2930                 /*
 2931                  * Loop around doing the lock op, while a blocking lock
 2932                  * must wait for the lock op to succeed.
 2933                  */
 2934                 do {
 2935                         ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
 2936                             ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
 2937                         if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 2938                             ap->a_op == F_SETLK) {
 2939                                 NFSVOPUNLOCK(vp, 0);
 2940                                 error = nfs_catnap(PZERO | PCATCH, ret,
 2941                                     "ncladvl");
 2942                                 if (error)
 2943                                         return (EINTR);
 2944                                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 2945                                 if (vp->v_iflag & VI_DOOMED) {
 2946                                         NFSVOPUNLOCK(vp, 0);
 2947                                         return (EBADF);
 2948                                 }
 2949                         }
 2950                 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 2951                      ap->a_op == F_SETLK);
 2952                 if (ret == NFSERR_DENIED) {
 2953                         NFSVOPUNLOCK(vp, 0);
 2954                         return (EAGAIN);
 2955                 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
 2956                         NFSVOPUNLOCK(vp, 0);
 2957                         return (ret);
 2958                 } else if (ret != 0) {
 2959                         NFSVOPUNLOCK(vp, 0);
 2960                         return (EACCES);
 2961                 }
 2962 
 2963                 /*
 2964                  * Now, if we just got a lock, invalidate data in the buffer
 2965                  * cache, as required, so that the coherency conforms with
 2966                  * RFC3530 Sec. 9.3.2.
 2967                  */
 2968                 if (ap->a_op == F_SETLK) {
 2969                         if ((np->n_flag & NMODIFIED) == 0) {
 2970                                 np->n_attrstamp = 0;
 2971                                 ret = VOP_GETATTR(vp, &va, cred);
 2972                         }
 2973                         if ((np->n_flag & NMODIFIED) || ret ||
 2974                             np->n_change != va.va_filerev) {
 2975                                 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
 2976                                 np->n_attrstamp = 0;
 2977                                 ret = VOP_GETATTR(vp, &va, cred);
 2978                                 if (!ret) {
 2979                                         np->n_mtime = va.va_mtime;
 2980                                         np->n_change = va.va_filerev;
 2981                                 }
 2982                         }
 2983                 }
 2984                 NFSVOPUNLOCK(vp, 0);
 2985                 return (0);
 2986         } else if (!NFS_ISV4(vp)) {
 2987                 error = NFSVOPLOCK(vp, LK_SHARED);
 2988                 if (error)
 2989                         return (error);
 2990                 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 2991                         size = VTONFS(vp)->n_size;
 2992                         NFSVOPUNLOCK(vp, 0);
 2993                         error = lf_advlock(ap, &(vp->v_lockf), size);
 2994                 } else {
 2995                         if (nfs_advlock_p != NULL)
 2996                                 error = nfs_advlock_p(ap);
 2997                         else {
 2998                                 NFSVOPUNLOCK(vp, 0);
 2999                                 error = ENOLCK;
 3000                         }
 3001                 }
 3002         }
 3003         return (error);
 3004 }
 3005 
 3006 /*
 3007  * NFS advisory byte-level locks.
 3008  */
 3009 static int
 3010 nfs_advlockasync(struct vop_advlockasync_args *ap)
 3011 {
 3012         struct vnode *vp = ap->a_vp;
 3013         u_quad_t size;
 3014         int error;
 3015         
 3016         if (NFS_ISV4(vp))
 3017                 return (EOPNOTSUPP);
 3018         error = NFSVOPLOCK(vp, LK_SHARED);
 3019         if (error)
 3020                 return (error);
 3021         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3022                 size = VTONFS(vp)->n_size;
 3023                 NFSVOPUNLOCK(vp, 0);
 3024                 error = lf_advlockasync(ap, &(vp->v_lockf), size);
 3025         } else {
 3026                 NFSVOPUNLOCK(vp, 0);
 3027                 error = EOPNOTSUPP;
 3028         }
 3029         return (error);
 3030 }
 3031 
 3032 /*
 3033  * Print out the contents of an nfsnode.
 3034  */
 3035 static int
 3036 nfs_print(struct vop_print_args *ap)
 3037 {
 3038         struct vnode *vp = ap->a_vp;
 3039         struct nfsnode *np = VTONFS(vp);
 3040 
 3041         ncl_printf("\tfileid %ld fsid 0x%x",
 3042            np->n_vattr.na_fileid, np->n_vattr.na_fsid);
 3043         if (vp->v_type == VFIFO)
 3044                 fifo_printinfo(vp);
 3045         printf("\n");
 3046         return (0);
 3047 }
 3048 
 3049 /*
 3050  * This is the "real" nfs::bwrite(struct buf*).
 3051  * We set B_CACHE if this is a VMIO buffer.
 3052  */
 3053 int
 3054 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
 3055 {
 3056         int s;
 3057         int oldflags = bp->b_flags;
 3058 #if 0
 3059         int retv = 1;
 3060         off_t off;
 3061 #endif
 3062 
 3063         BUF_ASSERT_HELD(bp);
 3064 
 3065         if (bp->b_flags & B_INVAL) {
 3066                 brelse(bp);
 3067                 return(0);
 3068         }
 3069 
 3070         bp->b_flags |= B_CACHE;
 3071 
 3072         /*
 3073          * Undirty the bp.  We will redirty it later if the I/O fails.
 3074          */
 3075 
 3076         s = splbio();
 3077         bundirty(bp);
 3078         bp->b_flags &= ~B_DONE;
 3079         bp->b_ioflags &= ~BIO_ERROR;
 3080         bp->b_iocmd = BIO_WRITE;
 3081 
 3082         bufobj_wref(bp->b_bufobj);
 3083         curthread->td_ru.ru_oublock++;
 3084         splx(s);
 3085 
 3086         /*
 3087          * Note: to avoid loopback deadlocks, we do not
 3088          * assign b_runningbufspace.
 3089          */
 3090         vfs_busy_pages(bp, 1);
 3091 
 3092         BUF_KERNPROC(bp);
 3093         bp->b_iooffset = dbtob(bp->b_blkno);
 3094         bstrategy(bp);
 3095 
 3096         if( (oldflags & B_ASYNC) == 0) {
 3097                 int rtval = bufwait(bp);
 3098 
 3099                 if (oldflags & B_DELWRI) {
 3100                         s = splbio();
 3101                         reassignbuf(bp);
 3102                         splx(s);
 3103                 }
 3104                 brelse(bp);
 3105                 return (rtval);
 3106         }
 3107 
 3108         return (0);
 3109 }
 3110 
 3111 /*
 3112  * nfs special file access vnode op.
 3113  * Essentially just get vattr and then imitate iaccess() since the device is
 3114  * local to the client.
 3115  */
 3116 static int
 3117 nfsspec_access(struct vop_access_args *ap)
 3118 {
 3119         struct vattr *vap;
 3120         struct ucred *cred = ap->a_cred;
 3121         struct vnode *vp = ap->a_vp;
 3122         accmode_t accmode = ap->a_accmode;
 3123         struct vattr vattr;
 3124         int error;
 3125 
 3126         /*
 3127          * Disallow write attempts on filesystems mounted read-only;
 3128          * unless the file is a socket, fifo, or a block or character
 3129          * device resident on the filesystem.
 3130          */
 3131         if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3132                 switch (vp->v_type) {
 3133                 case VREG:
 3134                 case VDIR:
 3135                 case VLNK:
 3136                         return (EROFS);
 3137                 default:
 3138                         break;
 3139                 }
 3140         }
 3141         vap = &vattr;
 3142         error = VOP_GETATTR(vp, vap, cred);
 3143         if (error)
 3144                 goto out;
 3145         error  = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
 3146             accmode, cred, NULL);
 3147 out:
 3148         return error;
 3149 }
 3150 
 3151 /*
 3152  * Read wrapper for fifos.
 3153  */
 3154 static int
 3155 nfsfifo_read(struct vop_read_args *ap)
 3156 {
 3157         struct nfsnode *np = VTONFS(ap->a_vp);
 3158         int error;
 3159 
 3160         /*
 3161          * Set access flag.
 3162          */
 3163         mtx_lock(&np->n_mtx);
 3164         np->n_flag |= NACC;
 3165         vfs_timestamp(&np->n_atim);
 3166         mtx_unlock(&np->n_mtx);
 3167         error = fifo_specops.vop_read(ap);
 3168         return error;   
 3169 }
 3170 
 3171 /*
 3172  * Write wrapper for fifos.
 3173  */
 3174 static int
 3175 nfsfifo_write(struct vop_write_args *ap)
 3176 {
 3177         struct nfsnode *np = VTONFS(ap->a_vp);
 3178 
 3179         /*
 3180          * Set update flag.
 3181          */
 3182         mtx_lock(&np->n_mtx);
 3183         np->n_flag |= NUPD;
 3184         vfs_timestamp(&np->n_mtim);
 3185         mtx_unlock(&np->n_mtx);
 3186         return(fifo_specops.vop_write(ap));
 3187 }
 3188 
 3189 /*
 3190  * Close wrapper for fifos.
 3191  *
 3192  * Update the times on the nfsnode then do fifo close.
 3193  */
 3194 static int
 3195 nfsfifo_close(struct vop_close_args *ap)
 3196 {
 3197         struct vnode *vp = ap->a_vp;
 3198         struct nfsnode *np = VTONFS(vp);
 3199         struct vattr vattr;
 3200         struct timespec ts;
 3201 
 3202         mtx_lock(&np->n_mtx);
 3203         if (np->n_flag & (NACC | NUPD)) {
 3204                 vfs_timestamp(&ts);
 3205                 if (np->n_flag & NACC)
 3206                         np->n_atim = ts;
 3207                 if (np->n_flag & NUPD)
 3208                         np->n_mtim = ts;
 3209                 np->n_flag |= NCHG;
 3210                 if (vrefcnt(vp) == 1 &&
 3211                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3212                         VATTR_NULL(&vattr);
 3213                         if (np->n_flag & NACC)
 3214                                 vattr.va_atime = np->n_atim;
 3215                         if (np->n_flag & NUPD)
 3216                                 vattr.va_mtime = np->n_mtim;
 3217                         mtx_unlock(&np->n_mtx);
 3218                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 3219                         goto out;
 3220                 }
 3221         }
 3222         mtx_unlock(&np->n_mtx);
 3223 out:
 3224         return (fifo_specops.vop_close(ap));
 3225 }
 3226 
 3227 /*
 3228  * Just call ncl_writebp() with the force argument set to 1.
 3229  *
 3230  * NOTE: B_DONE may or may not be set in a_bp on call.
 3231  */
 3232 static int
 3233 nfs_bwrite(struct buf *bp)
 3234 {
 3235 
 3236         return (ncl_writebp(bp, 1, curthread));
 3237 }
 3238 
 3239 struct buf_ops buf_ops_newnfs = {
 3240         .bop_name       =       "buf_ops_nfs",
 3241         .bop_write      =       nfs_bwrite,
 3242         .bop_strategy   =       bufstrategy,
 3243         .bop_sync       =       bufsync,
 3244         .bop_bdflush    =       bufbdflush,
 3245 };
 3246 
 3247 /*
 3248  * Cloned from vop_stdlock(), and then the ugly hack added.
 3249  */
 3250 static int
 3251 nfs_lock1(struct vop_lock1_args *ap)
 3252 {
 3253         struct vnode *vp = ap->a_vp;
 3254         int error = 0;
 3255 
 3256         /*
 3257          * Since vfs_hash_get() calls vget() and it will no longer work
 3258          * for FreeBSD8 with flags == 0, I can only think of this horrible
 3259          * hack to work around it. I call vfs_hash_get() with LK_EXCLOTHER
 3260          * and then handle it here. All I want for this case is a v_usecount
 3261          * on the vnode to use for recovery, while another thread might
 3262          * hold a lock on the vnode. I have the other threads blocked, so
 3263          * there isn't any race problem.
 3264          */
 3265         if ((ap->a_flags & LK_TYPE_MASK) == LK_EXCLOTHER) {
 3266                 if ((ap->a_flags & LK_INTERLOCK) == 0)
 3267                         panic("ncllock1");
 3268                 if ((vp->v_iflag & VI_DOOMED))
 3269                         error = ENOENT;
 3270                 VI_UNLOCK(vp);
 3271                 return (error);
 3272         }
 3273         return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
 3274             LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
 3275             ap->a_line));
 3276 }
 3277 
 3278 static int
 3279 nfs_getacl(struct vop_getacl_args *ap)
 3280 {
 3281         int error;
 3282 
 3283         if (ap->a_type != ACL_TYPE_NFS4)
 3284                 return (EOPNOTSUPP);
 3285         error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3286             NULL);
 3287         if (error > NFSERR_STALE) {
 3288                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3289                 error = EPERM;
 3290         }
 3291         return (error);
 3292 }
 3293 
 3294 static int
 3295 nfs_setacl(struct vop_setacl_args *ap)
 3296 {
 3297         int error;
 3298 
 3299         if (ap->a_type != ACL_TYPE_NFS4)
 3300                 return (EOPNOTSUPP);
 3301         error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3302             NULL);
 3303         if (error > NFSERR_STALE) {
 3304                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3305                 error = EPERM;
 3306         }
 3307         return (error);
 3308 }
 3309 
 3310 /*
 3311  * Return POSIX pathconf information applicable to nfs filesystems.
 3312  */
 3313 static int
 3314 nfs_pathconf(struct vop_pathconf_args *ap)
 3315 {
 3316         struct nfsv3_pathconf pc;
 3317         struct nfsvattr nfsva;
 3318         struct vnode *vp = ap->a_vp;
 3319         struct thread *td = curthread;
 3320         int attrflag, error;
 3321 
 3322         if (NFS_ISV4(vp) || (NFS_ISV3(vp) && (ap->a_name == _PC_LINK_MAX ||
 3323             ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
 3324             ap->a_name == _PC_NO_TRUNC))) {
 3325                 /*
 3326                  * Since only the above 4 a_names are returned by the NFSv3
 3327                  * Pathconf RPC, there is no point in doing it for others.
 3328                  */
 3329                 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
 3330                     &attrflag, NULL);
 3331                 if (attrflag != 0)
 3332                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 3333                             1);
 3334                 if (error != 0)
 3335                         return (error);
 3336         } else {
 3337                 /*
 3338                  * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
 3339                  * just fake them.
 3340                  */
 3341                 pc.pc_linkmax = LINK_MAX;
 3342                 pc.pc_namemax = NFS_MAXNAMLEN;
 3343                 pc.pc_notrunc = 1;
 3344                 pc.pc_chownrestricted = 1;
 3345                 pc.pc_caseinsensitive = 0;
 3346                 pc.pc_casepreserving = 1;
 3347                 error = 0;
 3348         }
 3349         switch (ap->a_name) {
 3350         case _PC_LINK_MAX:
 3351                 *ap->a_retval = pc.pc_linkmax;
 3352                 break;
 3353         case _PC_NAME_MAX:
 3354                 *ap->a_retval = pc.pc_namemax;
 3355                 break;
 3356         case _PC_PATH_MAX:
 3357                 *ap->a_retval = PATH_MAX;
 3358                 break;
 3359         case _PC_PIPE_BUF:
 3360                 *ap->a_retval = PIPE_BUF;
 3361                 break;
 3362         case _PC_CHOWN_RESTRICTED:
 3363                 *ap->a_retval = pc.pc_chownrestricted;
 3364                 break;
 3365         case _PC_NO_TRUNC:
 3366                 *ap->a_retval = pc.pc_notrunc;
 3367                 break;
 3368         case _PC_ACL_EXTENDED:
 3369                 *ap->a_retval = 0;
 3370                 break;
 3371         case _PC_ACL_NFS4:
 3372                 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
 3373                     NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
 3374                         *ap->a_retval = 1;
 3375                 else
 3376                         *ap->a_retval = 0;
 3377                 break;
 3378         case _PC_ACL_PATH_MAX:
 3379                 if (NFS_ISV4(vp))
 3380                         *ap->a_retval = ACL_MAX_ENTRIES;
 3381                 else
 3382                         *ap->a_retval = 3;
 3383                 break;
 3384         case _PC_MAC_PRESENT:
 3385                 *ap->a_retval = 0;
 3386                 break;
 3387         case _PC_ASYNC_IO:
 3388                 /* _PC_ASYNC_IO should have been handled by upper layers. */
 3389                 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
 3390                 error = EINVAL;
 3391                 break;
 3392         case _PC_PRIO_IO:
 3393                 *ap->a_retval = 0;
 3394                 break;
 3395         case _PC_SYNC_IO:
 3396                 *ap->a_retval = 0;
 3397                 break;
 3398         case _PC_ALLOC_SIZE_MIN:
 3399                 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
 3400                 break;
 3401         case _PC_FILESIZEBITS:
 3402                 if (NFS_ISV34(vp))
 3403                         *ap->a_retval = 64;
 3404                 else
 3405                         *ap->a_retval = 32;
 3406                 break;
 3407         case _PC_REC_INCR_XFER_SIZE:
 3408                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3409                 break;
 3410         case _PC_REC_MAX_XFER_SIZE:
 3411                 *ap->a_retval = -1; /* means ``unlimited'' */
 3412                 break;
 3413         case _PC_REC_MIN_XFER_SIZE:
 3414                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3415                 break;
 3416         case _PC_REC_XFER_ALIGN:
 3417                 *ap->a_retval = PAGE_SIZE;
 3418                 break;
 3419         case _PC_SYMLINK_MAX:
 3420                 *ap->a_retval = NFS_MAXPATHLEN;
 3421                 break;
 3422 
 3423         default:
 3424                 error = EINVAL;
 3425                 break;
 3426         }
 3427         return (error);
 3428 }
 3429 

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