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

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from nfs_vnops.c        8.16 (Berkeley) 5/27/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/10.2/sys/fs/nfsclient/nfs_clvnops.c 283987 2015-06-04 12:35:00Z rmacklem $");
   37 
   38 /*
   39  * vnode op calls for Sun NFS version 2, 3 and 4
   40  */
   41 
   42 #include "opt_kdtrace.h"
   43 #include "opt_inet.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/kernel.h>
   47 #include <sys/systm.h>
   48 #include <sys/resourcevar.h>
   49 #include <sys/proc.h>
   50 #include <sys/mount.h>
   51 #include <sys/bio.h>
   52 #include <sys/buf.h>
   53 #include <sys/jail.h>
   54 #include <sys/malloc.h>
   55 #include <sys/mbuf.h>
   56 #include <sys/namei.h>
   57 #include <sys/socket.h>
   58 #include <sys/vnode.h>
   59 #include <sys/dirent.h>
   60 #include <sys/fcntl.h>
   61 #include <sys/lockf.h>
   62 #include <sys/stat.h>
   63 #include <sys/sysctl.h>
   64 #include <sys/signalvar.h>
   65 
   66 #include <vm/vm.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 #include <fs/nfsclient/nfs_kdtrace.h>
   75 
   76 #include <net/if.h>
   77 #include <netinet/in.h>
   78 #include <netinet/in_var.h>
   79 
   80 #include <nfs/nfs_lock.h>
   81 
   82 #ifdef KDTRACE_HOOKS
   83 #include <sys/dtrace_bsd.h>
   84 
   85 dtrace_nfsclient_accesscache_flush_probe_func_t
   86                 dtrace_nfscl_accesscache_flush_done_probe;
   87 uint32_t        nfscl_accesscache_flush_done_id;
   88 
   89 dtrace_nfsclient_accesscache_get_probe_func_t
   90                 dtrace_nfscl_accesscache_get_hit_probe,
   91                 dtrace_nfscl_accesscache_get_miss_probe;
   92 uint32_t        nfscl_accesscache_get_hit_id;
   93 uint32_t        nfscl_accesscache_get_miss_id;
   94 
   95 dtrace_nfsclient_accesscache_load_probe_func_t
   96                 dtrace_nfscl_accesscache_load_done_probe;
   97 uint32_t        nfscl_accesscache_load_done_id;
   98 #endif /* !KDTRACE_HOOKS */
   99 
  100 /* Defs */
  101 #define TRUE    1
  102 #define FALSE   0
  103 
  104 extern struct nfsstats newnfsstats;
  105 extern int nfsrv_useacl;
  106 extern int nfscl_debuglevel;
  107 MALLOC_DECLARE(M_NEWNFSREQ);
  108 
  109 /*
  110  * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
  111  * calls are not in getblk() and brelse() so that they would not be necessary
  112  * here.
  113  */
  114 #ifndef B_VMIO
  115 #define vfs_busy_pages(bp, f)
  116 #endif
  117 
  118 static vop_read_t       nfsfifo_read;
  119 static vop_write_t      nfsfifo_write;
  120 static vop_close_t      nfsfifo_close;
  121 static int      nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
  122                     struct thread *);
  123 static vop_lookup_t     nfs_lookup;
  124 static vop_create_t     nfs_create;
  125 static vop_mknod_t      nfs_mknod;
  126 static vop_open_t       nfs_open;
  127 static vop_pathconf_t   nfs_pathconf;
  128 static vop_close_t      nfs_close;
  129 static vop_access_t     nfs_access;
  130 static vop_getattr_t    nfs_getattr;
  131 static vop_setattr_t    nfs_setattr;
  132 static vop_read_t       nfs_read;
  133 static vop_fsync_t      nfs_fsync;
  134 static vop_remove_t     nfs_remove;
  135 static vop_link_t       nfs_link;
  136 static vop_rename_t     nfs_rename;
  137 static vop_mkdir_t      nfs_mkdir;
  138 static vop_rmdir_t      nfs_rmdir;
  139 static vop_symlink_t    nfs_symlink;
  140 static vop_readdir_t    nfs_readdir;
  141 static vop_strategy_t   nfs_strategy;
  142 static vop_lock1_t      nfs_lock1;
  143 static  int     nfs_lookitup(struct vnode *, char *, int,
  144                     struct ucred *, struct thread *, struct nfsnode **);
  145 static  int     nfs_sillyrename(struct vnode *, struct vnode *,
  146                     struct componentname *);
  147 static vop_access_t     nfsspec_access;
  148 static vop_readlink_t   nfs_readlink;
  149 static vop_print_t      nfs_print;
  150 static vop_advlock_t    nfs_advlock;
  151 static vop_advlockasync_t nfs_advlockasync;
  152 static vop_getacl_t nfs_getacl;
  153 static vop_setacl_t nfs_setacl;
  154 
  155 /*
  156  * Global vfs data structures for nfs
  157  */
  158 struct vop_vector newnfs_vnodeops = {
  159         .vop_default =          &default_vnodeops,
  160         .vop_access =           nfs_access,
  161         .vop_advlock =          nfs_advlock,
  162         .vop_advlockasync =     nfs_advlockasync,
  163         .vop_close =            nfs_close,
  164         .vop_create =           nfs_create,
  165         .vop_fsync =            nfs_fsync,
  166         .vop_getattr =          nfs_getattr,
  167         .vop_getpages =         ncl_getpages,
  168         .vop_putpages =         ncl_putpages,
  169         .vop_inactive =         ncl_inactive,
  170         .vop_link =             nfs_link,
  171         .vop_lock1 =            nfs_lock1,
  172         .vop_lookup =           nfs_lookup,
  173         .vop_mkdir =            nfs_mkdir,
  174         .vop_mknod =            nfs_mknod,
  175         .vop_open =             nfs_open,
  176         .vop_pathconf =         nfs_pathconf,
  177         .vop_print =            nfs_print,
  178         .vop_read =             nfs_read,
  179         .vop_readdir =          nfs_readdir,
  180         .vop_readlink =         nfs_readlink,
  181         .vop_reclaim =          ncl_reclaim,
  182         .vop_remove =           nfs_remove,
  183         .vop_rename =           nfs_rename,
  184         .vop_rmdir =            nfs_rmdir,
  185         .vop_setattr =          nfs_setattr,
  186         .vop_strategy =         nfs_strategy,
  187         .vop_symlink =          nfs_symlink,
  188         .vop_write =            ncl_write,
  189         .vop_getacl =           nfs_getacl,
  190         .vop_setacl =           nfs_setacl,
  191 };
  192 
  193 struct vop_vector newnfs_fifoops = {
  194         .vop_default =          &fifo_specops,
  195         .vop_access =           nfsspec_access,
  196         .vop_close =            nfsfifo_close,
  197         .vop_fsync =            nfs_fsync,
  198         .vop_getattr =          nfs_getattr,
  199         .vop_inactive =         ncl_inactive,
  200         .vop_print =            nfs_print,
  201         .vop_read =             nfsfifo_read,
  202         .vop_reclaim =          ncl_reclaim,
  203         .vop_setattr =          nfs_setattr,
  204         .vop_write =            nfsfifo_write,
  205 };
  206 
  207 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
  208     struct componentname *cnp, struct vattr *vap);
  209 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
  210     int namelen, struct ucred *cred, struct thread *td);
  211 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
  212     char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
  213     char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
  214 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
  215     struct componentname *scnp, struct sillyrename *sp);
  216 
  217 /*
  218  * Global variables
  219  */
  220 #define DIRHDSIZ        (sizeof (struct dirent) - (MAXNAMLEN + 1))
  221 
  222 SYSCTL_DECL(_vfs_nfs);
  223 
  224 static int      nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
  225 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
  226            &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
  227 
  228 static int      nfs_prime_access_cache = 0;
  229 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
  230            &nfs_prime_access_cache, 0,
  231            "Prime NFS ACCESS cache when fetching attributes");
  232 
  233 static int      newnfs_commit_on_close = 0;
  234 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
  235     &newnfs_commit_on_close, 0, "write+commit on close, else only write");
  236 
  237 static int      nfs_clean_pages_on_close = 1;
  238 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
  239            &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
  240 
  241 int newnfs_directio_enable = 0;
  242 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
  243            &newnfs_directio_enable, 0, "Enable NFS directio");
  244 
  245 int nfs_keep_dirty_on_error;
  246 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
  247     &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
  248 
  249 /*
  250  * This sysctl allows other processes to mmap a file that has been opened
  251  * O_DIRECT by a process.  In general, having processes mmap the file while
  252  * Direct IO is in progress can lead to Data Inconsistencies.  But, we allow
  253  * this by default to prevent DoS attacks - to prevent a malicious user from
  254  * opening up files O_DIRECT preventing other users from mmap'ing these
  255  * files.  "Protected" environments where stricter consistency guarantees are
  256  * required can disable this knob.  The process that opened the file O_DIRECT
  257  * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
  258  * meaningful.
  259  */
  260 int newnfs_directio_allow_mmap = 1;
  261 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
  262            &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
  263 
  264 #if 0
  265 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
  266            &newnfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
  267 
  268 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
  269            &newnfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
  270 #endif
  271 
  272 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY                \
  273                          | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
  274                          | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
  275 
  276 /*
  277  * SMP Locking Note :
  278  * The list of locks after the description of the lock is the ordering
  279  * of other locks acquired with the lock held.
  280  * np->n_mtx : Protects the fields in the nfsnode.
  281        VM Object Lock
  282        VI_MTX (acquired indirectly)
  283  * nmp->nm_mtx : Protects the fields in the nfsmount.
  284        rep->r_mtx
  285  * ncl_iod_mutex : Global lock, protects shared nfsiod state.
  286  * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
  287        nmp->nm_mtx
  288        rep->r_mtx
  289  * rep->r_mtx : Protects the fields in an nfsreq.
  290  */
  291 
  292 static int
  293 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
  294     struct ucred *cred, u_int32_t *retmode)
  295 {
  296         int error = 0, attrflag, i, lrupos;
  297         u_int32_t rmode;
  298         struct nfsnode *np = VTONFS(vp);
  299         struct nfsvattr nfsva;
  300 
  301         error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
  302             &rmode, NULL);
  303         if (attrflag)
  304                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
  305         if (!error) {
  306                 lrupos = 0;
  307                 mtx_lock(&np->n_mtx);
  308                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  309                         if (np->n_accesscache[i].uid == cred->cr_uid) {
  310                                 np->n_accesscache[i].mode = rmode;
  311                                 np->n_accesscache[i].stamp = time_second;
  312                                 break;
  313                         }
  314                         if (i > 0 && np->n_accesscache[i].stamp <
  315                             np->n_accesscache[lrupos].stamp)
  316                                 lrupos = i;
  317                 }
  318                 if (i == NFS_ACCESSCACHESIZE) {
  319                         np->n_accesscache[lrupos].uid = cred->cr_uid;
  320                         np->n_accesscache[lrupos].mode = rmode;
  321                         np->n_accesscache[lrupos].stamp = time_second;
  322                 }
  323                 mtx_unlock(&np->n_mtx);
  324                 if (retmode != NULL)
  325                         *retmode = rmode;
  326                 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
  327         } else if (NFS_ISV4(vp)) {
  328                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  329         }
  330 #ifdef KDTRACE_HOOKS
  331         if (error != 0)
  332                 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
  333                     error);
  334 #endif
  335         return (error);
  336 }
  337 
  338 /*
  339  * nfs access vnode op.
  340  * For nfs version 2, just return ok. File accesses may fail later.
  341  * For nfs version 3, use the access rpc to check accessibility. If file modes
  342  * are changed on the server, accesses might still fail later.
  343  */
  344 static int
  345 nfs_access(struct vop_access_args *ap)
  346 {
  347         struct vnode *vp = ap->a_vp;
  348         int error = 0, i, gotahit;
  349         u_int32_t mode, wmode, rmode;
  350         int v34 = NFS_ISV34(vp);
  351         struct nfsnode *np = VTONFS(vp);
  352 
  353         /*
  354          * Disallow write attempts on filesystems mounted read-only;
  355          * unless the file is a socket, fifo, or a block or character
  356          * device resident on the filesystem.
  357          */
  358         if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
  359             VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
  360             VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
  361                 switch (vp->v_type) {
  362                 case VREG:
  363                 case VDIR:
  364                 case VLNK:
  365                         return (EROFS);
  366                 default:
  367                         break;
  368                 }
  369         }
  370         /*
  371          * For nfs v3 or v4, check to see if we have done this recently, and if
  372          * so return our cached result instead of making an ACCESS call.
  373          * If not, do an access rpc, otherwise you are stuck emulating
  374          * ufs_access() locally using the vattr. This may not be correct,
  375          * since the server may apply other access criteria such as
  376          * client uid-->server uid mapping that we do not know about.
  377          */
  378         if (v34) {
  379                 if (ap->a_accmode & VREAD)
  380                         mode = NFSACCESS_READ;
  381                 else
  382                         mode = 0;
  383                 if (vp->v_type != VDIR) {
  384                         if (ap->a_accmode & VWRITE)
  385                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  386                         if (ap->a_accmode & VAPPEND)
  387                                 mode |= NFSACCESS_EXTEND;
  388                         if (ap->a_accmode & VEXEC)
  389                                 mode |= NFSACCESS_EXECUTE;
  390                         if (ap->a_accmode & VDELETE)
  391                                 mode |= NFSACCESS_DELETE;
  392                 } else {
  393                         if (ap->a_accmode & VWRITE)
  394                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  395                         if (ap->a_accmode & VAPPEND)
  396                                 mode |= NFSACCESS_EXTEND;
  397                         if (ap->a_accmode & VEXEC)
  398                                 mode |= NFSACCESS_LOOKUP;
  399                         if (ap->a_accmode & VDELETE)
  400                                 mode |= NFSACCESS_DELETE;
  401                         if (ap->a_accmode & VDELETE_CHILD)
  402                                 mode |= NFSACCESS_MODIFY;
  403                 }
  404                 /* XXX safety belt, only make blanket request if caching */
  405                 if (nfsaccess_cache_timeout > 0) {
  406                         wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
  407                                 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
  408                                 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
  409                 } else {
  410                         wmode = mode;
  411                 }
  412 
  413                 /*
  414                  * Does our cached result allow us to give a definite yes to
  415                  * this request?
  416                  */
  417                 gotahit = 0;
  418                 mtx_lock(&np->n_mtx);
  419                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  420                         if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
  421                             if (time_second < (np->n_accesscache[i].stamp
  422                                 + nfsaccess_cache_timeout) &&
  423                                 (np->n_accesscache[i].mode & mode) == mode) {
  424                                 NFSINCRGLOBAL(newnfsstats.accesscache_hits);
  425                                 gotahit = 1;
  426                             }
  427                             break;
  428                         }
  429                 }
  430                 mtx_unlock(&np->n_mtx);
  431 #ifdef KDTRACE_HOOKS
  432                 if (gotahit != 0)
  433                         KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
  434                             ap->a_cred->cr_uid, mode);
  435                 else
  436                         KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
  437                             ap->a_cred->cr_uid, mode);
  438 #endif
  439                 if (gotahit == 0) {
  440                         /*
  441                          * Either a no, or a don't know.  Go to the wire.
  442                          */
  443                         NFSINCRGLOBAL(newnfsstats.accesscache_misses);
  444                         error = nfs34_access_otw(vp, wmode, ap->a_td,
  445                             ap->a_cred, &rmode);
  446                         if (!error &&
  447                             (rmode & mode) != mode)
  448                                 error = EACCES;
  449                 }
  450                 return (error);
  451         } else {
  452                 if ((error = nfsspec_access(ap)) != 0) {
  453                         return (error);
  454                 }
  455                 /*
  456                  * Attempt to prevent a mapped root from accessing a file
  457                  * which it shouldn't.  We try to read a byte from the file
  458                  * if the user is root and the file is not zero length.
  459                  * After calling nfsspec_access, we should have the correct
  460                  * file size cached.
  461                  */
  462                 mtx_lock(&np->n_mtx);
  463                 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
  464                     && VTONFS(vp)->n_size > 0) {
  465                         struct iovec aiov;
  466                         struct uio auio;
  467                         char buf[1];
  468 
  469                         mtx_unlock(&np->n_mtx);
  470                         aiov.iov_base = buf;
  471                         aiov.iov_len = 1;
  472                         auio.uio_iov = &aiov;
  473                         auio.uio_iovcnt = 1;
  474                         auio.uio_offset = 0;
  475                         auio.uio_resid = 1;
  476                         auio.uio_segflg = UIO_SYSSPACE;
  477                         auio.uio_rw = UIO_READ;
  478                         auio.uio_td = ap->a_td;
  479 
  480                         if (vp->v_type == VREG)
  481                                 error = ncl_readrpc(vp, &auio, ap->a_cred);
  482                         else if (vp->v_type == VDIR) {
  483                                 char* bp;
  484                                 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
  485                                 aiov.iov_base = bp;
  486                                 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
  487                                 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
  488                                     ap->a_td);
  489                                 free(bp, M_TEMP);
  490                         } else if (vp->v_type == VLNK)
  491                                 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
  492                         else
  493                                 error = EACCES;
  494                 } else
  495                         mtx_unlock(&np->n_mtx);
  496                 return (error);
  497         }
  498 }
  499 
  500 
  501 /*
  502  * nfs open vnode op
  503  * Check to see if the type is ok
  504  * and that deletion is not in progress.
  505  * For paged in text files, you will need to flush the page cache
  506  * if consistency is lost.
  507  */
  508 /* ARGSUSED */
  509 static int
  510 nfs_open(struct vop_open_args *ap)
  511 {
  512         struct vnode *vp = ap->a_vp;
  513         struct nfsnode *np = VTONFS(vp);
  514         struct vattr vattr;
  515         int error;
  516         int fmode = ap->a_mode;
  517         struct ucred *cred;
  518 
  519         if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
  520                 return (EOPNOTSUPP);
  521 
  522         /*
  523          * For NFSv4, we need to do the Open Op before cache validation,
  524          * so that we conform to RFC3530 Sec. 9.3.1.
  525          */
  526         if (NFS_ISV4(vp)) {
  527                 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
  528                 if (error) {
  529                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  530                             (gid_t)0);
  531                         return (error);
  532                 }
  533         }
  534 
  535         /*
  536          * Now, if this Open will be doing reading, re-validate/flush the
  537          * cache, so that Close/Open coherency is maintained.
  538          */
  539         mtx_lock(&np->n_mtx);
  540         if (np->n_flag & NMODIFIED) {
  541                 mtx_unlock(&np->n_mtx);
  542                 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  543                 if (error == EINTR || error == EIO) {
  544                         if (NFS_ISV4(vp))
  545                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  546                         return (error);
  547                 }
  548                 mtx_lock(&np->n_mtx);
  549                 np->n_attrstamp = 0;
  550                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  551                 if (vp->v_type == VDIR)
  552                         np->n_direofoffset = 0;
  553                 mtx_unlock(&np->n_mtx);
  554                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  555                 if (error) {
  556                         if (NFS_ISV4(vp))
  557                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  558                         return (error);
  559                 }
  560                 mtx_lock(&np->n_mtx);
  561                 np->n_mtime = vattr.va_mtime;
  562                 if (NFS_ISV4(vp))
  563                         np->n_change = vattr.va_filerev;
  564         } else {
  565                 mtx_unlock(&np->n_mtx);
  566                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  567                 if (error) {
  568                         if (NFS_ISV4(vp))
  569                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  570                         return (error);
  571                 }
  572                 mtx_lock(&np->n_mtx);
  573                 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
  574                     NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
  575                         if (vp->v_type == VDIR)
  576                                 np->n_direofoffset = 0;
  577                         mtx_unlock(&np->n_mtx);
  578                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  579                         if (error == EINTR || error == EIO) {
  580                                 if (NFS_ISV4(vp))
  581                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  582                                 return (error);
  583                         }
  584                         mtx_lock(&np->n_mtx);
  585                         np->n_mtime = vattr.va_mtime;
  586                         if (NFS_ISV4(vp))
  587                                 np->n_change = vattr.va_filerev;
  588                 }
  589         }
  590 
  591         /*
  592          * If the object has >= 1 O_DIRECT active opens, we disable caching.
  593          */
  594         if (newnfs_directio_enable && (fmode & O_DIRECT) &&
  595             (vp->v_type == VREG)) {
  596                 if (np->n_directio_opens == 0) {
  597                         mtx_unlock(&np->n_mtx);
  598                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  599                         if (error) {
  600                                 if (NFS_ISV4(vp))
  601                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  602                                 return (error);
  603                         }
  604                         mtx_lock(&np->n_mtx);
  605                         np->n_flag |= NNONCACHE;
  606                 }
  607                 np->n_directio_opens++;
  608         }
  609 
  610         /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */
  611         if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0)
  612                 np->n_flag |= NWRITEOPENED;
  613 
  614         /*
  615          * If this is an open for writing, capture a reference to the
  616          * credentials, so they can be used by ncl_putpages(). Using
  617          * these write credentials is preferable to the credentials of
  618          * whatever thread happens to be doing the VOP_PUTPAGES() since
  619          * the write RPCs are less likely to fail with EACCES.
  620          */
  621         if ((fmode & FWRITE) != 0) {
  622                 cred = np->n_writecred;
  623                 np->n_writecred = crhold(ap->a_cred);
  624         } else
  625                 cred = NULL;
  626         mtx_unlock(&np->n_mtx);
  627 
  628         if (cred != NULL)
  629                 crfree(cred);
  630         vnode_create_vobject(vp, vattr.va_size, ap->a_td);
  631         return (0);
  632 }
  633 
  634 /*
  635  * nfs close vnode op
  636  * What an NFS client should do upon close after writing is a debatable issue.
  637  * Most NFS clients push delayed writes to the server upon close, basically for
  638  * two reasons:
  639  * 1 - So that any write errors may be reported back to the client process
  640  *     doing the close system call. By far the two most likely errors are
  641  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
  642  * 2 - To put a worst case upper bound on cache inconsistency between
  643  *     multiple clients for the file.
  644  * There is also a consistency problem for Version 2 of the protocol w.r.t.
  645  * not being able to tell if other clients are writing a file concurrently,
  646  * since there is no way of knowing if the changed modify time in the reply
  647  * is only due to the write for this client.
  648  * (NFS Version 3 provides weak cache consistency data in the reply that
  649  *  should be sufficient to detect and handle this case.)
  650  *
  651  * The current code does the following:
  652  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
  653  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
  654  *                     or commit them (this satisfies 1 and 2 except for the
  655  *                     case where the server crashes after this close but
  656  *                     before the commit RPC, which is felt to be "good
  657  *                     enough". Changing the last argument to ncl_flush() to
  658  *                     a 1 would force a commit operation, if it is felt a
  659  *                     commit is necessary now.
  660  * for NFS Version 4 - flush the dirty buffers and commit them, if
  661  *                     nfscl_mustflush() says this is necessary.
  662  *                     It is necessary if there is no write delegation held,
  663  *                     in order to satisfy open/close coherency.
  664  *                     If the file isn't cached on local stable storage,
  665  *                     it may be necessary in order to detect "out of space"
  666  *                     errors from the server, if the write delegation
  667  *                     issued by the server doesn't allow the file to grow.
  668  */
  669 /* ARGSUSED */
  670 static int
  671 nfs_close(struct vop_close_args *ap)
  672 {
  673         struct vnode *vp = ap->a_vp;
  674         struct nfsnode *np = VTONFS(vp);
  675         struct nfsvattr nfsva;
  676         struct ucred *cred;
  677         int error = 0, ret, localcred = 0;
  678         int fmode = ap->a_fflag;
  679 
  680         if ((vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF))
  681                 return (0);
  682         /*
  683          * During shutdown, a_cred isn't valid, so just use root.
  684          */
  685         if (ap->a_cred == NOCRED) {
  686                 cred = newnfs_getcred();
  687                 localcred = 1;
  688         } else {
  689                 cred = ap->a_cred;
  690         }
  691         if (vp->v_type == VREG) {
  692             /*
  693              * Examine and clean dirty pages, regardless of NMODIFIED.
  694              * This closes a major hole in close-to-open consistency.
  695              * We want to push out all dirty pages (and buffers) on
  696              * close, regardless of whether they were dirtied by
  697              * mmap'ed writes or via write().
  698              */
  699             if (nfs_clean_pages_on_close && vp->v_object) {
  700                 VM_OBJECT_WLOCK(vp->v_object);
  701                 vm_object_page_clean(vp->v_object, 0, 0, 0);
  702                 VM_OBJECT_WUNLOCK(vp->v_object);
  703             }
  704             mtx_lock(&np->n_mtx);
  705             if (np->n_flag & NMODIFIED) {
  706                 mtx_unlock(&np->n_mtx);
  707                 if (NFS_ISV3(vp)) {
  708                     /*
  709                      * Under NFSv3 we have dirty buffers to dispose of.  We
  710                      * must flush them to the NFS server.  We have the option
  711                      * of waiting all the way through the commit rpc or just
  712                      * waiting for the initial write.  The default is to only
  713                      * wait through the initial write so the data is in the
  714                      * server's cache, which is roughly similar to the state
  715                      * a standard disk subsystem leaves the file in on close().
  716                      *
  717                      * We cannot clear the NMODIFIED bit in np->n_flag due to
  718                      * potential races with other processes, and certainly
  719                      * cannot clear it if we don't commit.
  720                      * These races occur when there is no longer the old
  721                      * traditional vnode locking implemented for Vnode Ops.
  722                      */
  723                     int cm = newnfs_commit_on_close ? 1 : 0;
  724                     error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td, cm, 0);
  725                     /* np->n_flag &= ~NMODIFIED; */
  726                 } else if (NFS_ISV4(vp)) { 
  727                         if (nfscl_mustflush(vp) != 0) {
  728                                 int cm = newnfs_commit_on_close ? 1 : 0;
  729                                 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td,
  730                                     cm, 0);
  731                                 /*
  732                                  * as above w.r.t races when clearing
  733                                  * NMODIFIED.
  734                                  * np->n_flag &= ~NMODIFIED;
  735                                  */
  736                         }
  737                 } else
  738                     error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  739                 mtx_lock(&np->n_mtx);
  740             }
  741             /* 
  742              * Invalidate the attribute cache in all cases.
  743              * An open is going to fetch fresh attrs any way, other procs
  744              * on this node that have file open will be forced to do an 
  745              * otw attr fetch, but this is safe.
  746              * --> A user found that their RPC count dropped by 20% when
  747              *     this was commented out and I can't see any requirement
  748              *     for it, so I've disabled it when negative lookups are
  749              *     enabled. (What does this have to do with negative lookup
  750              *     caching? Well nothing, except it was reported by the
  751              *     same user that needed negative lookup caching and I wanted
  752              *     there to be a way to disable it to see if it
  753              *     is the cause of some caching/coherency issue that might
  754              *     crop up.)
  755              */
  756             if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) {
  757                     np->n_attrstamp = 0;
  758                     KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  759             }
  760             if (np->n_flag & NWRITEERR) {
  761                 np->n_flag &= ~NWRITEERR;
  762                 error = np->n_error;
  763             }
  764             mtx_unlock(&np->n_mtx);
  765         }
  766 
  767         if (NFS_ISV4(vp)) {
  768                 /*
  769                  * Get attributes so "change" is up to date.
  770                  */
  771                 if (error == 0 && nfscl_mustflush(vp) != 0 &&
  772                     vp->v_type == VREG &&
  773                     (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) {
  774                         ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
  775                             NULL);
  776                         if (!ret) {
  777                                 np->n_change = nfsva.na_filerev;
  778                                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
  779                                     NULL, 0, 0);
  780                         }
  781                 }
  782 
  783                 /*
  784                  * and do the close.
  785                  */
  786                 ret = nfsrpc_close(vp, 0, ap->a_td);
  787                 if (!error && ret)
  788                         error = ret;
  789                 if (error)
  790                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  791                             (gid_t)0);
  792         }
  793         if (newnfs_directio_enable)
  794                 KASSERT((np->n_directio_asyncwr == 0),
  795                         ("nfs_close: dirty unflushed (%d) directio buffers\n",
  796                          np->n_directio_asyncwr));
  797         if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  798                 mtx_lock(&np->n_mtx);
  799                 KASSERT((np->n_directio_opens > 0), 
  800                         ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
  801                 np->n_directio_opens--;
  802                 if (np->n_directio_opens == 0)
  803                         np->n_flag &= ~NNONCACHE;
  804                 mtx_unlock(&np->n_mtx);
  805         }
  806         if (localcred)
  807                 NFSFREECRED(cred);
  808         return (error);
  809 }
  810 
  811 /*
  812  * nfs getattr call from vfs.
  813  */
  814 static int
  815 nfs_getattr(struct vop_getattr_args *ap)
  816 {
  817         struct vnode *vp = ap->a_vp;
  818         struct thread *td = curthread;  /* XXX */
  819         struct nfsnode *np = VTONFS(vp);
  820         int error = 0;
  821         struct nfsvattr nfsva;
  822         struct vattr *vap = ap->a_vap;
  823         struct vattr vattr;
  824 
  825         /*
  826          * Update local times for special files.
  827          */
  828         mtx_lock(&np->n_mtx);
  829         if (np->n_flag & (NACC | NUPD))
  830                 np->n_flag |= NCHG;
  831         mtx_unlock(&np->n_mtx);
  832         /*
  833          * First look in the cache.
  834          */
  835         if (ncl_getattrcache(vp, &vattr) == 0) {
  836                 vap->va_type = vattr.va_type;
  837                 vap->va_mode = vattr.va_mode;
  838                 vap->va_nlink = vattr.va_nlink;
  839                 vap->va_uid = vattr.va_uid;
  840                 vap->va_gid = vattr.va_gid;
  841                 vap->va_fsid = vattr.va_fsid;
  842                 vap->va_fileid = vattr.va_fileid;
  843                 vap->va_size = vattr.va_size;
  844                 vap->va_blocksize = vattr.va_blocksize;
  845                 vap->va_atime = vattr.va_atime;
  846                 vap->va_mtime = vattr.va_mtime;
  847                 vap->va_ctime = vattr.va_ctime;
  848                 vap->va_gen = vattr.va_gen;
  849                 vap->va_flags = vattr.va_flags;
  850                 vap->va_rdev = vattr.va_rdev;
  851                 vap->va_bytes = vattr.va_bytes;
  852                 vap->va_filerev = vattr.va_filerev;
  853                 /*
  854                  * Get the local modify time for the case of a write
  855                  * delegation.
  856                  */
  857                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  858                 return (0);
  859         }
  860 
  861         if (NFS_ISV34(vp) && nfs_prime_access_cache &&
  862             nfsaccess_cache_timeout > 0) {
  863                 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
  864                 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
  865                 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
  866                         nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
  867                         return (0);
  868                 }
  869         }
  870         error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
  871         if (!error)
  872                 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
  873         if (!error) {
  874                 /*
  875                  * Get the local modify time for the case of a write
  876                  * delegation.
  877                  */
  878                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  879         } else if (NFS_ISV4(vp)) {
  880                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  881         }
  882         return (error);
  883 }
  884 
  885 /*
  886  * nfs setattr call.
  887  */
  888 static int
  889 nfs_setattr(struct vop_setattr_args *ap)
  890 {
  891         struct vnode *vp = ap->a_vp;
  892         struct nfsnode *np = VTONFS(vp);
  893         struct thread *td = curthread;  /* XXX */
  894         struct vattr *vap = ap->a_vap;
  895         int error = 0;
  896         u_quad_t tsize;
  897 
  898 #ifndef nolint
  899         tsize = (u_quad_t)0;
  900 #endif
  901 
  902         /*
  903          * Setting of flags and marking of atimes are not supported.
  904          */
  905         if (vap->va_flags != VNOVAL)
  906                 return (EOPNOTSUPP);
  907 
  908         /*
  909          * Disallow write attempts if the filesystem is mounted read-only.
  910          */
  911         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  912             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  913             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  914             (vp->v_mount->mnt_flag & MNT_RDONLY))
  915                 return (EROFS);
  916         if (vap->va_size != VNOVAL) {
  917                 switch (vp->v_type) {
  918                 case VDIR:
  919                         return (EISDIR);
  920                 case VCHR:
  921                 case VBLK:
  922                 case VSOCK:
  923                 case VFIFO:
  924                         if (vap->va_mtime.tv_sec == VNOVAL &&
  925                             vap->va_atime.tv_sec == VNOVAL &&
  926                             vap->va_mode == (mode_t)VNOVAL &&
  927                             vap->va_uid == (uid_t)VNOVAL &&
  928                             vap->va_gid == (gid_t)VNOVAL)
  929                                 return (0);             
  930                         vap->va_size = VNOVAL;
  931                         break;
  932                 default:
  933                         /*
  934                          * Disallow write attempts if the filesystem is
  935                          * mounted read-only.
  936                          */
  937                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  938                                 return (EROFS);
  939                         /*
  940                          *  We run vnode_pager_setsize() early (why?),
  941                          * we must set np->n_size now to avoid vinvalbuf
  942                          * V_SAVE races that might setsize a lower
  943                          * value.
  944                          */
  945                         mtx_lock(&np->n_mtx);
  946                         tsize = np->n_size;
  947                         mtx_unlock(&np->n_mtx);
  948                         error = ncl_meta_setsize(vp, ap->a_cred, td,
  949                             vap->va_size);
  950                         mtx_lock(&np->n_mtx);
  951                         if (np->n_flag & NMODIFIED) {
  952                             tsize = np->n_size;
  953                             mtx_unlock(&np->n_mtx);
  954                             if (vap->va_size == 0)
  955                                 error = ncl_vinvalbuf(vp, 0, td, 1);
  956                             else
  957                                 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
  958                             if (error) {
  959                                 vnode_pager_setsize(vp, tsize);
  960                                 return (error);
  961                             }
  962                             /*
  963                              * Call nfscl_delegmodtime() to set the modify time
  964                              * locally, as required.
  965                              */
  966                             nfscl_delegmodtime(vp);
  967                         } else
  968                             mtx_unlock(&np->n_mtx);
  969                         /*
  970                          * np->n_size has already been set to vap->va_size
  971                          * in ncl_meta_setsize(). We must set it again since
  972                          * nfs_loadattrcache() could be called through
  973                          * ncl_meta_setsize() and could modify np->n_size.
  974                          */
  975                         mtx_lock(&np->n_mtx);
  976                         np->n_vattr.na_size = np->n_size = vap->va_size;
  977                         mtx_unlock(&np->n_mtx);
  978                 };
  979         } else {
  980                 mtx_lock(&np->n_mtx);
  981                 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 
  982                     (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
  983                         mtx_unlock(&np->n_mtx);
  984                         if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
  985                             (error == EINTR || error == EIO))
  986                                 return (error);
  987                 } else
  988                         mtx_unlock(&np->n_mtx);
  989         }
  990         error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
  991         if (error && vap->va_size != VNOVAL) {
  992                 mtx_lock(&np->n_mtx);
  993                 np->n_size = np->n_vattr.na_size = tsize;
  994                 vnode_pager_setsize(vp, tsize);
  995                 mtx_unlock(&np->n_mtx);
  996         }
  997         return (error);
  998 }
  999 
 1000 /*
 1001  * Do an nfs setattr rpc.
 1002  */
 1003 static int
 1004 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
 1005     struct thread *td)
 1006 {
 1007         struct nfsnode *np = VTONFS(vp);
 1008         int error, ret, attrflag, i;
 1009         struct nfsvattr nfsva;
 1010 
 1011         if (NFS_ISV34(vp)) {
 1012                 mtx_lock(&np->n_mtx);
 1013                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
 1014                         np->n_accesscache[i].stamp = 0;
 1015                 np->n_flag |= NDELEGMOD;
 1016                 mtx_unlock(&np->n_mtx);
 1017                 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
 1018         }
 1019         error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
 1020             NULL);
 1021         if (attrflag) {
 1022                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1023                 if (ret && !error)
 1024                         error = ret;
 1025         }
 1026         if (error && NFS_ISV4(vp))
 1027                 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
 1028         return (error);
 1029 }
 1030 
 1031 /*
 1032  * nfs lookup call, one step at a time...
 1033  * First look in cache
 1034  * If not found, unlock the directory nfsnode and do the rpc
 1035  */
 1036 static int
 1037 nfs_lookup(struct vop_lookup_args *ap)
 1038 {
 1039         struct componentname *cnp = ap->a_cnp;
 1040         struct vnode *dvp = ap->a_dvp;
 1041         struct vnode **vpp = ap->a_vpp;
 1042         struct mount *mp = dvp->v_mount;
 1043         int flags = cnp->cn_flags;
 1044         struct vnode *newvp;
 1045         struct nfsmount *nmp;
 1046         struct nfsnode *np, *newnp;
 1047         int error = 0, attrflag, dattrflag, ltype, ncticks;
 1048         struct thread *td = cnp->cn_thread;
 1049         struct nfsfh *nfhp;
 1050         struct nfsvattr dnfsva, nfsva;
 1051         struct vattr vattr;
 1052         struct timespec nctime;
 1053         
 1054         *vpp = NULLVP;
 1055         if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
 1056             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
 1057                 return (EROFS);
 1058         if (dvp->v_type != VDIR)
 1059                 return (ENOTDIR);
 1060         nmp = VFSTONFS(mp);
 1061         np = VTONFS(dvp);
 1062 
 1063         /* For NFSv4, wait until any remove is done. */
 1064         mtx_lock(&np->n_mtx);
 1065         while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
 1066                 np->n_flag |= NREMOVEWANT;
 1067                 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
 1068         }
 1069         mtx_unlock(&np->n_mtx);
 1070 
 1071         if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
 1072                 return (error);
 1073         error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
 1074         if (error > 0 && error != ENOENT)
 1075                 return (error);
 1076         if (error == -1) {
 1077                 /*
 1078                  * Lookups of "." are special and always return the
 1079                  * current directory.  cache_lookup() already handles
 1080                  * associated locking bookkeeping, etc.
 1081                  */
 1082                 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
 1083                         /* XXX: Is this really correct? */
 1084                         if (cnp->cn_nameiop != LOOKUP &&
 1085                             (flags & ISLASTCN))
 1086                                 cnp->cn_flags |= SAVENAME;
 1087                         return (0);
 1088                 }
 1089 
 1090                 /*
 1091                  * We only accept a positive hit in the cache if the
 1092                  * change time of the file matches our cached copy.
 1093                  * Otherwise, we discard the cache entry and fallback
 1094                  * to doing a lookup RPC.  We also only trust cache
 1095                  * entries for less than nm_nametimeo seconds.
 1096                  *
 1097                  * To better handle stale file handles and attributes,
 1098                  * clear the attribute cache of this node if it is a
 1099                  * leaf component, part of an open() call, and not
 1100                  * locally modified before fetching the attributes.
 1101                  * This should allow stale file handles to be detected
 1102                  * here where we can fall back to a LOOKUP RPC to
 1103                  * recover rather than having nfs_open() detect the
 1104                  * stale file handle and failing open(2) with ESTALE.
 1105                  */
 1106                 newvp = *vpp;
 1107                 newnp = VTONFS(newvp);
 1108                 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
 1109                     (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1110                     !(newnp->n_flag & NMODIFIED)) {
 1111                         mtx_lock(&newnp->n_mtx);
 1112                         newnp->n_attrstamp = 0;
 1113                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1114                         mtx_unlock(&newnp->n_mtx);
 1115                 }
 1116                 if (nfscl_nodeleg(newvp, 0) == 0 ||
 1117                     ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
 1118                     VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
 1119                     timespeccmp(&vattr.va_ctime, &nctime, ==))) {
 1120                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1121                         if (cnp->cn_nameiop != LOOKUP &&
 1122                             (flags & ISLASTCN))
 1123                                 cnp->cn_flags |= SAVENAME;
 1124                         return (0);
 1125                 }
 1126                 cache_purge(newvp);
 1127                 if (dvp != newvp)
 1128                         vput(newvp);
 1129                 else 
 1130                         vrele(newvp);
 1131                 *vpp = NULLVP;
 1132         } else if (error == ENOENT) {
 1133                 if (dvp->v_iflag & VI_DOOMED)
 1134                         return (ENOENT);
 1135                 /*
 1136                  * We only accept a negative hit in the cache if the
 1137                  * modification time of the parent directory matches
 1138                  * the cached copy in the name cache entry.
 1139                  * Otherwise, we discard all of the negative cache
 1140                  * entries for this directory.  We also only trust
 1141                  * negative cache entries for up to nm_negnametimeo
 1142                  * seconds.
 1143                  */
 1144                 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
 1145                     VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
 1146                     timespeccmp(&vattr.va_mtime, &nctime, ==)) {
 1147                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1148                         return (ENOENT);
 1149                 }
 1150                 cache_purge_negative(dvp);
 1151         }
 1152 
 1153         error = 0;
 1154         newvp = NULLVP;
 1155         NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
 1156         error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1157             cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1158             NULL);
 1159         if (dattrflag)
 1160                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1161         if (error) {
 1162                 if (newvp != NULLVP) {
 1163                         vput(newvp);
 1164                         *vpp = NULLVP;
 1165                 }
 1166 
 1167                 if (error != ENOENT) {
 1168                         if (NFS_ISV4(dvp))
 1169                                 error = nfscl_maperr(td, error, (uid_t)0,
 1170                                     (gid_t)0);
 1171                         return (error);
 1172                 }
 1173 
 1174                 /* The requested file was not found. */
 1175                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 1176                     (flags & ISLASTCN)) {
 1177                         /*
 1178                          * XXX: UFS does a full VOP_ACCESS(dvp,
 1179                          * VWRITE) here instead of just checking
 1180                          * MNT_RDONLY.
 1181                          */
 1182                         if (mp->mnt_flag & MNT_RDONLY)
 1183                                 return (EROFS);
 1184                         cnp->cn_flags |= SAVENAME;
 1185                         return (EJUSTRETURN);
 1186                 }
 1187 
 1188                 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) {
 1189                         /*
 1190                          * Cache the modification time of the parent
 1191                          * directory from the post-op attributes in
 1192                          * the name cache entry.  The negative cache
 1193                          * entry will be ignored once the directory
 1194                          * has changed.  Don't bother adding the entry
 1195                          * if the directory has already changed.
 1196                          */
 1197                         mtx_lock(&np->n_mtx);
 1198                         if (timespeccmp(&np->n_vattr.na_mtime,
 1199                             &dnfsva.na_mtime, ==)) {
 1200                                 mtx_unlock(&np->n_mtx);
 1201                                 cache_enter_time(dvp, NULL, cnp,
 1202                                     &dnfsva.na_mtime, NULL);
 1203                         } else
 1204                                 mtx_unlock(&np->n_mtx);
 1205                 }
 1206                 return (ENOENT);
 1207         }
 1208 
 1209         /*
 1210          * Handle RENAME case...
 1211          */
 1212         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 1213                 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1214                         FREE((caddr_t)nfhp, M_NFSFH);
 1215                         return (EISDIR);
 1216                 }
 1217                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1218                     LK_EXCLUSIVE);
 1219                 if (error)
 1220                         return (error);
 1221                 newvp = NFSTOV(np);
 1222                 if (attrflag)
 1223                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1224                             0, 1);
 1225                 *vpp = newvp;
 1226                 cnp->cn_flags |= SAVENAME;
 1227                 return (0);
 1228         }
 1229 
 1230         if (flags & ISDOTDOT) {
 1231                 ltype = NFSVOPISLOCKED(dvp);
 1232                 error = vfs_busy(mp, MBF_NOWAIT);
 1233                 if (error != 0) {
 1234                         vfs_ref(mp);
 1235                         NFSVOPUNLOCK(dvp, 0);
 1236                         error = vfs_busy(mp, 0);
 1237                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1238                         vfs_rel(mp);
 1239                         if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
 1240                                 vfs_unbusy(mp);
 1241                                 error = ENOENT;
 1242                         }
 1243                         if (error != 0)
 1244                                 return (error);
 1245                 }
 1246                 NFSVOPUNLOCK(dvp, 0);
 1247                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1248                     cnp->cn_lkflags);
 1249                 if (error == 0)
 1250                         newvp = NFSTOV(np);
 1251                 vfs_unbusy(mp);
 1252                 if (newvp != dvp)
 1253                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1254                 if (dvp->v_iflag & VI_DOOMED) {
 1255                         if (error == 0) {
 1256                                 if (newvp == dvp)
 1257                                         vrele(newvp);
 1258                                 else
 1259                                         vput(newvp);
 1260                         }
 1261                         error = ENOENT;
 1262                 }
 1263                 if (error != 0)
 1264                         return (error);
 1265                 if (attrflag)
 1266                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1267                             0, 1);
 1268         } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1269                 FREE((caddr_t)nfhp, M_NFSFH);
 1270                 VREF(dvp);
 1271                 newvp = dvp;
 1272                 if (attrflag)
 1273                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1274                             0, 1);
 1275         } else {
 1276                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1277                     cnp->cn_lkflags);
 1278                 if (error)
 1279                         return (error);
 1280                 newvp = NFSTOV(np);
 1281                 if (attrflag)
 1282                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1283                             0, 1);
 1284                 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1285                     !(np->n_flag & NMODIFIED)) {                        
 1286                         /*
 1287                          * Flush the attribute cache when opening a
 1288                          * leaf node to ensure that fresh attributes
 1289                          * are fetched in nfs_open() since we did not
 1290                          * fetch attributes from the LOOKUP reply.
 1291                          */
 1292                         mtx_lock(&np->n_mtx);
 1293                         np->n_attrstamp = 0;
 1294                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1295                         mtx_unlock(&np->n_mtx);
 1296                 }
 1297         }
 1298         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1299                 cnp->cn_flags |= SAVENAME;
 1300         if ((cnp->cn_flags & MAKEENTRY) &&
 1301             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
 1302             attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
 1303                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1304                     newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
 1305         *vpp = newvp;
 1306         return (0);
 1307 }
 1308 
 1309 /*
 1310  * nfs read call.
 1311  * Just call ncl_bioread() to do the work.
 1312  */
 1313 static int
 1314 nfs_read(struct vop_read_args *ap)
 1315 {
 1316         struct vnode *vp = ap->a_vp;
 1317 
 1318         switch (vp->v_type) {
 1319         case VREG:
 1320                 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1321         case VDIR:
 1322                 return (EISDIR);
 1323         default:
 1324                 return (EOPNOTSUPP);
 1325         }
 1326 }
 1327 
 1328 /*
 1329  * nfs readlink call
 1330  */
 1331 static int
 1332 nfs_readlink(struct vop_readlink_args *ap)
 1333 {
 1334         struct vnode *vp = ap->a_vp;
 1335 
 1336         if (vp->v_type != VLNK)
 1337                 return (EINVAL);
 1338         return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1339 }
 1340 
 1341 /*
 1342  * Do a readlink rpc.
 1343  * Called by ncl_doio() from below the buffer cache.
 1344  */
 1345 int
 1346 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1347 {
 1348         int error, ret, attrflag;
 1349         struct nfsvattr nfsva;
 1350 
 1351         error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
 1352             &attrflag, NULL);
 1353         if (attrflag) {
 1354                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1355                 if (ret && !error)
 1356                         error = ret;
 1357         }
 1358         if (error && NFS_ISV4(vp))
 1359                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1360         return (error);
 1361 }
 1362 
 1363 /*
 1364  * nfs read rpc call
 1365  * Ditto above
 1366  */
 1367 int
 1368 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1369 {
 1370         int error, ret, attrflag;
 1371         struct nfsvattr nfsva;
 1372         struct nfsmount *nmp;
 1373 
 1374         nmp = VFSTONFS(vnode_mount(vp));
 1375         error = EIO;
 1376         attrflag = 0;
 1377         if (NFSHASPNFS(nmp))
 1378                 error = nfscl_doiods(vp, uiop, NULL, NULL,
 1379                     NFSV4OPEN_ACCESSREAD, cred, uiop->uio_td);
 1380         NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
 1381         if (error != 0)
 1382                 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
 1383                     &attrflag, NULL);
 1384         if (attrflag) {
 1385                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1386                 if (ret && !error)
 1387                         error = ret;
 1388         }
 1389         if (error && NFS_ISV4(vp))
 1390                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1391         return (error);
 1392 }
 1393 
 1394 /*
 1395  * nfs write call
 1396  */
 1397 int
 1398 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1399     int *iomode, int *must_commit, int called_from_strategy)
 1400 {
 1401         struct nfsvattr nfsva;
 1402         int error, attrflag, ret;
 1403         struct nfsmount *nmp;
 1404 
 1405         nmp = VFSTONFS(vnode_mount(vp));
 1406         error = EIO;
 1407         attrflag = 0;
 1408         if (NFSHASPNFS(nmp))
 1409                 error = nfscl_doiods(vp, uiop, iomode, must_commit,
 1410                     NFSV4OPEN_ACCESSWRITE, cred, uiop->uio_td);
 1411         NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
 1412         if (error != 0)
 1413                 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
 1414                     uiop->uio_td, &nfsva, &attrflag, NULL,
 1415                     called_from_strategy);
 1416         if (attrflag) {
 1417                 if (VTONFS(vp)->n_flag & ND_NFSV4)
 1418                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
 1419                             1);
 1420                 else
 1421                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 1422                             1);
 1423                 if (ret && !error)
 1424                         error = ret;
 1425         }
 1426         if (DOINGASYNC(vp))
 1427                 *iomode = NFSWRITE_FILESYNC;
 1428         if (error && NFS_ISV4(vp))
 1429                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1430         return (error);
 1431 }
 1432 
 1433 /*
 1434  * nfs mknod rpc
 1435  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1436  * mode set to specify the file type and the size field for rdev.
 1437  */
 1438 static int
 1439 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1440     struct vattr *vap)
 1441 {
 1442         struct nfsvattr nfsva, dnfsva;
 1443         struct vnode *newvp = NULL;
 1444         struct nfsnode *np = NULL, *dnp;
 1445         struct nfsfh *nfhp;
 1446         struct vattr vattr;
 1447         int error = 0, attrflag, dattrflag;
 1448         u_int32_t rdev;
 1449 
 1450         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1451                 rdev = vap->va_rdev;
 1452         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1453                 rdev = 0xffffffff;
 1454         else
 1455                 return (EOPNOTSUPP);
 1456         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1457                 return (error);
 1458         error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
 1459             rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 1460             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 1461         if (!error) {
 1462                 if (!nfhp)
 1463                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1464                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1465                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1466                             NULL);
 1467                 if (nfhp)
 1468                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1469                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1470         }
 1471         if (dattrflag)
 1472                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1473         if (!error) {
 1474                 newvp = NFSTOV(np);
 1475                 if (attrflag != 0) {
 1476                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1477                             0, 1);
 1478                         if (error != 0)
 1479                                 vput(newvp);
 1480                 }
 1481         }
 1482         if (!error) {
 1483                 *vpp = newvp;
 1484         } else if (NFS_ISV4(dvp)) {
 1485                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1486                     vap->va_gid);
 1487         }
 1488         dnp = VTONFS(dvp);
 1489         mtx_lock(&dnp->n_mtx);
 1490         dnp->n_flag |= NMODIFIED;
 1491         if (!dattrflag) {
 1492                 dnp->n_attrstamp = 0;
 1493                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1494         }
 1495         mtx_unlock(&dnp->n_mtx);
 1496         return (error);
 1497 }
 1498 
 1499 /*
 1500  * nfs mknod vop
 1501  * just call nfs_mknodrpc() to do the work.
 1502  */
 1503 /* ARGSUSED */
 1504 static int
 1505 nfs_mknod(struct vop_mknod_args *ap)
 1506 {
 1507         return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
 1508 }
 1509 
 1510 static struct mtx nfs_cverf_mtx;
 1511 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
 1512     MTX_DEF);
 1513 
 1514 static nfsquad_t
 1515 nfs_get_cverf(void)
 1516 {
 1517         static nfsquad_t cverf;
 1518         nfsquad_t ret;
 1519         static int cverf_initialized = 0;
 1520 
 1521         mtx_lock(&nfs_cverf_mtx);
 1522         if (cverf_initialized == 0) {
 1523                 cverf.lval[0] = arc4random();
 1524                 cverf.lval[1] = arc4random();
 1525                 cverf_initialized = 1;
 1526         } else
 1527                 cverf.qval++;
 1528         ret = cverf;
 1529         mtx_unlock(&nfs_cverf_mtx);
 1530 
 1531         return (ret);
 1532 }
 1533 
 1534 /*
 1535  * nfs file create call
 1536  */
 1537 static int
 1538 nfs_create(struct vop_create_args *ap)
 1539 {
 1540         struct vnode *dvp = ap->a_dvp;
 1541         struct vattr *vap = ap->a_vap;
 1542         struct componentname *cnp = ap->a_cnp;
 1543         struct nfsnode *np = NULL, *dnp;
 1544         struct vnode *newvp = NULL;
 1545         struct nfsmount *nmp;
 1546         struct nfsvattr dnfsva, nfsva;
 1547         struct nfsfh *nfhp;
 1548         nfsquad_t cverf;
 1549         int error = 0, attrflag, dattrflag, fmode = 0;
 1550         struct vattr vattr;
 1551 
 1552         /*
 1553          * Oops, not for me..
 1554          */
 1555         if (vap->va_type == VSOCK)
 1556                 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 1557 
 1558         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1559                 return (error);
 1560         if (vap->va_vaflags & VA_EXCLUSIVE)
 1561                 fmode |= O_EXCL;
 1562         dnp = VTONFS(dvp);
 1563         nmp = VFSTONFS(vnode_mount(dvp));
 1564 again:
 1565         /* For NFSv4, wait until any remove is done. */
 1566         mtx_lock(&dnp->n_mtx);
 1567         while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
 1568                 dnp->n_flag |= NREMOVEWANT;
 1569                 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
 1570         }
 1571         mtx_unlock(&dnp->n_mtx);
 1572 
 1573         cverf = nfs_get_cverf();
 1574         error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1575             vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
 1576             &nfhp, &attrflag, &dattrflag, NULL);
 1577         if (!error) {
 1578                 if (nfhp == NULL)
 1579                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1580                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1581                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1582                             NULL);
 1583                 if (nfhp != NULL)
 1584                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1585                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1586         }
 1587         if (dattrflag)
 1588                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1589         if (!error) {
 1590                 newvp = NFSTOV(np);
 1591                 if (attrflag == 0)
 1592                         error = nfsrpc_getattr(newvp, cnp->cn_cred,
 1593                             cnp->cn_thread, &nfsva, NULL);
 1594                 if (error == 0)
 1595                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1596                             0, 1);
 1597         }
 1598         if (error) {
 1599                 if (newvp != NULL) {
 1600                         vput(newvp);
 1601                         newvp = NULL;
 1602                 }
 1603                 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
 1604                     error == NFSERR_NOTSUPP) {
 1605                         fmode &= ~O_EXCL;
 1606                         goto again;
 1607                 }
 1608         } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
 1609                 if (nfscl_checksattr(vap, &nfsva)) {
 1610                         error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
 1611                             cnp->cn_thread, &nfsva, &attrflag, NULL);
 1612                         if (error && (vap->va_uid != (uid_t)VNOVAL ||
 1613                             vap->va_gid != (gid_t)VNOVAL)) {
 1614                                 /* try again without setting uid/gid */
 1615                                 vap->va_uid = (uid_t)VNOVAL;
 1616                                 vap->va_gid = (uid_t)VNOVAL;
 1617                                 error = nfsrpc_setattr(newvp, vap, NULL, 
 1618                                     cnp->cn_cred, cnp->cn_thread, &nfsva,
 1619                                     &attrflag, NULL);
 1620                         }
 1621                         if (attrflag)
 1622                                 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 1623                                     NULL, 0, 1);
 1624                         if (error != 0)
 1625                                 vput(newvp);
 1626                 }
 1627         }
 1628         if (!error) {
 1629                 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
 1630                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1631                             NULL);
 1632                 *ap->a_vpp = newvp;
 1633         } else if (NFS_ISV4(dvp)) {
 1634                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1635                     vap->va_gid);
 1636         }
 1637         mtx_lock(&dnp->n_mtx);
 1638         dnp->n_flag |= NMODIFIED;
 1639         if (!dattrflag) {
 1640                 dnp->n_attrstamp = 0;
 1641                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1642         }
 1643         mtx_unlock(&dnp->n_mtx);
 1644         return (error);
 1645 }
 1646 
 1647 /*
 1648  * nfs file remove call
 1649  * To try and make nfs semantics closer to ufs semantics, a file that has
 1650  * other processes using the vnode is renamed instead of removed and then
 1651  * removed later on the last close.
 1652  * - If v_usecount > 1
 1653  *        If a rename is not already in the works
 1654  *           call nfs_sillyrename() to set it up
 1655  *     else
 1656  *        do the remove rpc
 1657  */
 1658 static int
 1659 nfs_remove(struct vop_remove_args *ap)
 1660 {
 1661         struct vnode *vp = ap->a_vp;
 1662         struct vnode *dvp = ap->a_dvp;
 1663         struct componentname *cnp = ap->a_cnp;
 1664         struct nfsnode *np = VTONFS(vp);
 1665         int error = 0;
 1666         struct vattr vattr;
 1667 
 1668         KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
 1669         KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
 1670         if (vp->v_type == VDIR)
 1671                 error = EPERM;
 1672         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1673             VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
 1674             vattr.va_nlink > 1)) {
 1675                 /*
 1676                  * Purge the name cache so that the chance of a lookup for
 1677                  * the name succeeding while the remove is in progress is
 1678                  * minimized. Without node locking it can still happen, such
 1679                  * that an I/O op returns ESTALE, but since you get this if
 1680                  * another host removes the file..
 1681                  */
 1682                 cache_purge(vp);
 1683                 /*
 1684                  * throw away biocache buffers, mainly to avoid
 1685                  * unnecessary delayed writes later.
 1686                  */
 1687                 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1688                 /* Do the rpc */
 1689                 if (error != EINTR && error != EIO)
 1690                         error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
 1691                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1692                 /*
 1693                  * Kludge City: If the first reply to the remove rpc is lost..
 1694                  *   the reply to the retransmitted request will be ENOENT
 1695                  *   since the file was in fact removed
 1696                  *   Therefore, we cheat and return success.
 1697                  */
 1698                 if (error == ENOENT)
 1699                         error = 0;
 1700         } else if (!np->n_sillyrename)
 1701                 error = nfs_sillyrename(dvp, vp, cnp);
 1702         mtx_lock(&np->n_mtx);
 1703         np->n_attrstamp = 0;
 1704         mtx_unlock(&np->n_mtx);
 1705         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1706         return (error);
 1707 }
 1708 
 1709 /*
 1710  * nfs file remove rpc called from nfs_inactive
 1711  */
 1712 int
 1713 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
 1714 {
 1715         /*
 1716          * Make sure that the directory vnode is still valid.
 1717          * XXX we should lock sp->s_dvp here.
 1718          */
 1719         if (sp->s_dvp->v_type == VBAD)
 1720                 return (0);
 1721         return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
 1722             sp->s_cred, NULL));
 1723 }
 1724 
 1725 /*
 1726  * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
 1727  */
 1728 static int
 1729 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
 1730     int namelen, struct ucred *cred, struct thread *td)
 1731 {
 1732         struct nfsvattr dnfsva;
 1733         struct nfsnode *dnp = VTONFS(dvp);
 1734         int error = 0, dattrflag;
 1735 
 1736         mtx_lock(&dnp->n_mtx);
 1737         dnp->n_flag |= NREMOVEINPROG;
 1738         mtx_unlock(&dnp->n_mtx);
 1739         error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
 1740             &dattrflag, NULL);
 1741         mtx_lock(&dnp->n_mtx);
 1742         if ((dnp->n_flag & NREMOVEWANT)) {
 1743                 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
 1744                 mtx_unlock(&dnp->n_mtx);
 1745                 wakeup((caddr_t)dnp);
 1746         } else {
 1747                 dnp->n_flag &= ~NREMOVEINPROG;
 1748                 mtx_unlock(&dnp->n_mtx);
 1749         }
 1750         if (dattrflag)
 1751                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1752         mtx_lock(&dnp->n_mtx);
 1753         dnp->n_flag |= NMODIFIED;
 1754         if (!dattrflag) {
 1755                 dnp->n_attrstamp = 0;
 1756                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1757         }
 1758         mtx_unlock(&dnp->n_mtx);
 1759         if (error && NFS_ISV4(dvp))
 1760                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1761         return (error);
 1762 }
 1763 
 1764 /*
 1765  * nfs file rename call
 1766  */
 1767 static int
 1768 nfs_rename(struct vop_rename_args *ap)
 1769 {
 1770         struct vnode *fvp = ap->a_fvp;
 1771         struct vnode *tvp = ap->a_tvp;
 1772         struct vnode *fdvp = ap->a_fdvp;
 1773         struct vnode *tdvp = ap->a_tdvp;
 1774         struct componentname *tcnp = ap->a_tcnp;
 1775         struct componentname *fcnp = ap->a_fcnp;
 1776         struct nfsnode *fnp = VTONFS(ap->a_fvp);
 1777         struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
 1778         struct nfsv4node *newv4 = NULL;
 1779         int error;
 1780 
 1781         KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
 1782             (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
 1783         /* Check for cross-device rename */
 1784         if ((fvp->v_mount != tdvp->v_mount) ||
 1785             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1786                 error = EXDEV;
 1787                 goto out;
 1788         }
 1789 
 1790         if (fvp == tvp) {
 1791                 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n");
 1792                 error = 0;
 1793                 goto out;
 1794         }
 1795         if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
 1796                 goto out;
 1797 
 1798         /*
 1799          * We have to flush B_DELWRI data prior to renaming
 1800          * the file.  If we don't, the delayed-write buffers
 1801          * can be flushed out later after the file has gone stale
 1802          * under NFSV3.  NFSV2 does not have this problem because
 1803          * ( as far as I can tell ) it flushes dirty buffers more
 1804          * often.
 1805          * 
 1806          * Skip the rename operation if the fsync fails, this can happen
 1807          * due to the server's volume being full, when we pushed out data
 1808          * that was written back to our cache earlier. Not checking for
 1809          * this condition can result in potential (silent) data loss.
 1810          */
 1811         error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1812         NFSVOPUNLOCK(fvp, 0);
 1813         if (!error && tvp)
 1814                 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1815         if (error)
 1816                 goto out;
 1817 
 1818         /*
 1819          * If the tvp exists and is in use, sillyrename it before doing the
 1820          * rename of the new file over it.
 1821          * XXX Can't sillyrename a directory.
 1822          */
 1823         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1824                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1825                 vput(tvp);
 1826                 tvp = NULL;
 1827         }
 1828 
 1829         error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1830             tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1831             tcnp->cn_thread);
 1832 
 1833         if (error == 0 && NFS_ISV4(tdvp)) {
 1834                 /*
 1835                  * For NFSv4, check to see if it is the same name and
 1836                  * replace the name, if it is different.
 1837                  */
 1838                 MALLOC(newv4, struct nfsv4node *,
 1839                     sizeof (struct nfsv4node) +
 1840                     tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
 1841                     M_NFSV4NODE, M_WAITOK);
 1842                 mtx_lock(&tdnp->n_mtx);
 1843                 mtx_lock(&fnp->n_mtx);
 1844                 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
 1845                     (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
 1846                       NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
 1847                       tcnp->cn_namelen) ||
 1848                       tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
 1849                       NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1850                         tdnp->n_fhp->nfh_len))) {
 1851 #ifdef notdef
 1852 { char nnn[100]; int nnnl;
 1853 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
 1854 bcopy(tcnp->cn_nameptr, nnn, nnnl);
 1855 nnn[nnnl] = '\0';
 1856 printf("ren replace=%s\n",nnn);
 1857 }
 1858 #endif
 1859                         FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
 1860                         fnp->n_v4 = newv4;
 1861                         newv4 = NULL;
 1862                         fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
 1863                         fnp->n_v4->n4_namelen = tcnp->cn_namelen;
 1864                         NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1865                             tdnp->n_fhp->nfh_len);
 1866                         NFSBCOPY(tcnp->cn_nameptr,
 1867                             NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
 1868                 }
 1869                 mtx_unlock(&tdnp->n_mtx);
 1870                 mtx_unlock(&fnp->n_mtx);
 1871                 if (newv4 != NULL)
 1872                         FREE((caddr_t)newv4, M_NFSV4NODE);
 1873         }
 1874 
 1875         if (fvp->v_type == VDIR) {
 1876                 if (tvp != NULL && tvp->v_type == VDIR)
 1877                         cache_purge(tdvp);
 1878                 cache_purge(fdvp);
 1879         }
 1880 
 1881 out:
 1882         if (tdvp == tvp)
 1883                 vrele(tdvp);
 1884         else
 1885                 vput(tdvp);
 1886         if (tvp)
 1887                 vput(tvp);
 1888         vrele(fdvp);
 1889         vrele(fvp);
 1890         /*
 1891          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1892          */
 1893         if (error == ENOENT)
 1894                 error = 0;
 1895         return (error);
 1896 }
 1897 
 1898 /*
 1899  * nfs file rename rpc called from nfs_remove() above
 1900  */
 1901 static int
 1902 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
 1903     struct sillyrename *sp)
 1904 {
 1905 
 1906         return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
 1907             sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
 1908             scnp->cn_thread));
 1909 }
 1910 
 1911 /*
 1912  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 1913  */
 1914 static int
 1915 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
 1916     int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
 1917     int tnamelen, struct ucred *cred, struct thread *td)
 1918 {
 1919         struct nfsvattr fnfsva, tnfsva;
 1920         struct nfsnode *fdnp = VTONFS(fdvp);
 1921         struct nfsnode *tdnp = VTONFS(tdvp);
 1922         int error = 0, fattrflag, tattrflag;
 1923 
 1924         error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
 1925             tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
 1926             &tattrflag, NULL, NULL);
 1927         mtx_lock(&fdnp->n_mtx);
 1928         fdnp->n_flag |= NMODIFIED;
 1929         if (fattrflag != 0) {
 1930                 mtx_unlock(&fdnp->n_mtx);
 1931                 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
 1932         } else {
 1933                 fdnp->n_attrstamp = 0;
 1934                 mtx_unlock(&fdnp->n_mtx);
 1935                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
 1936         }
 1937         mtx_lock(&tdnp->n_mtx);
 1938         tdnp->n_flag |= NMODIFIED;
 1939         if (tattrflag != 0) {
 1940                 mtx_unlock(&tdnp->n_mtx);
 1941                 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
 1942         } else {
 1943                 tdnp->n_attrstamp = 0;
 1944                 mtx_unlock(&tdnp->n_mtx);
 1945                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 1946         }
 1947         if (error && NFS_ISV4(fdvp))
 1948                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1949         return (error);
 1950 }
 1951 
 1952 /*
 1953  * nfs hard link create call
 1954  */
 1955 static int
 1956 nfs_link(struct vop_link_args *ap)
 1957 {
 1958         struct vnode *vp = ap->a_vp;
 1959         struct vnode *tdvp = ap->a_tdvp;
 1960         struct componentname *cnp = ap->a_cnp;
 1961         struct nfsnode *np, *tdnp;
 1962         struct nfsvattr nfsva, dnfsva;
 1963         int error = 0, attrflag, dattrflag;
 1964 
 1965         /*
 1966          * Push all writes to the server, so that the attribute cache
 1967          * doesn't get "out of sync" with the server.
 1968          * XXX There should be a better way!
 1969          */
 1970         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 1971 
 1972         error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
 1973             cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
 1974             &dattrflag, NULL);
 1975         tdnp = VTONFS(tdvp);
 1976         mtx_lock(&tdnp->n_mtx);
 1977         tdnp->n_flag |= NMODIFIED;
 1978         if (dattrflag != 0) {
 1979                 mtx_unlock(&tdnp->n_mtx);
 1980                 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
 1981         } else {
 1982                 tdnp->n_attrstamp = 0;
 1983                 mtx_unlock(&tdnp->n_mtx);
 1984                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 1985         }
 1986         if (attrflag)
 1987                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1988         else {
 1989                 np = VTONFS(vp);
 1990                 mtx_lock(&np->n_mtx);
 1991                 np->n_attrstamp = 0;
 1992                 mtx_unlock(&np->n_mtx);
 1993                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1994         }
 1995         /*
 1996          * If negative lookup caching is enabled, I might as well
 1997          * add an entry for this node. Not necessary for correctness,
 1998          * but if negative caching is enabled, then the system
 1999          * must care about lookup caching hit rate, so...
 2000          */
 2001         if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
 2002             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 2003                 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
 2004         }
 2005         if (error && NFS_ISV4(vp))
 2006                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2007                     (gid_t)0);
 2008         return (error);
 2009 }
 2010 
 2011 /*
 2012  * nfs symbolic link create call
 2013  */
 2014 static int
 2015 nfs_symlink(struct vop_symlink_args *ap)
 2016 {
 2017         struct vnode *dvp = ap->a_dvp;
 2018         struct vattr *vap = ap->a_vap;
 2019         struct componentname *cnp = ap->a_cnp;
 2020         struct nfsvattr nfsva, dnfsva;
 2021         struct nfsfh *nfhp;
 2022         struct nfsnode *np = NULL, *dnp;
 2023         struct vnode *newvp = NULL;
 2024         int error = 0, attrflag, dattrflag, ret;
 2025 
 2026         vap->va_type = VLNK;
 2027         error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2028             ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 2029             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 2030         if (nfhp) {
 2031                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2032                     &np, NULL, LK_EXCLUSIVE);
 2033                 if (!ret)
 2034                         newvp = NFSTOV(np);
 2035                 else if (!error)
 2036                         error = ret;
 2037         }
 2038         if (newvp != NULL) {
 2039                 if (attrflag)
 2040                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2041                             0, 1);
 2042         } else if (!error) {
 2043                 /*
 2044                  * If we do not have an error and we could not extract the
 2045                  * newvp from the response due to the request being NFSv2, we
 2046                  * have to do a lookup in order to obtain a newvp to return.
 2047                  */
 2048                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2049                     cnp->cn_cred, cnp->cn_thread, &np);
 2050                 if (!error)
 2051                         newvp = NFSTOV(np);
 2052         }
 2053         if (error) {
 2054                 if (newvp)
 2055                         vput(newvp);
 2056                 if (NFS_ISV4(dvp))
 2057                         error = nfscl_maperr(cnp->cn_thread, error,
 2058                             vap->va_uid, vap->va_gid);
 2059         } else {
 2060                 *ap->a_vpp = newvp;
 2061         }
 2062 
 2063         dnp = VTONFS(dvp);
 2064         mtx_lock(&dnp->n_mtx);
 2065         dnp->n_flag |= NMODIFIED;
 2066         if (dattrflag != 0) {
 2067                 mtx_unlock(&dnp->n_mtx);
 2068                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2069         } else {
 2070                 dnp->n_attrstamp = 0;
 2071                 mtx_unlock(&dnp->n_mtx);
 2072                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2073         }
 2074         /*
 2075          * If negative lookup caching is enabled, I might as well
 2076          * add an entry for this node. Not necessary for correctness,
 2077          * but if negative caching is enabled, then the system
 2078          * must care about lookup caching hit rate, so...
 2079          */
 2080         if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2081             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 2082                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
 2083         }
 2084         return (error);
 2085 }
 2086 
 2087 /*
 2088  * nfs make dir call
 2089  */
 2090 static int
 2091 nfs_mkdir(struct vop_mkdir_args *ap)
 2092 {
 2093         struct vnode *dvp = ap->a_dvp;
 2094         struct vattr *vap = ap->a_vap;
 2095         struct componentname *cnp = ap->a_cnp;
 2096         struct nfsnode *np = NULL, *dnp;
 2097         struct vnode *newvp = NULL;
 2098         struct vattr vattr;
 2099         struct nfsfh *nfhp;
 2100         struct nfsvattr nfsva, dnfsva;
 2101         int error = 0, attrflag, dattrflag, ret;
 2102 
 2103         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
 2104                 return (error);
 2105         vap->va_type = VDIR;
 2106         error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2107             vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
 2108             &attrflag, &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                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2119         }
 2120         if (nfhp) {
 2121                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2122                     &np, NULL, LK_EXCLUSIVE);
 2123                 if (!ret) {
 2124                         newvp = NFSTOV(np);
 2125                         if (attrflag)
 2126                            (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 2127                                 NULL, 0, 1);
 2128                 } else if (!error)
 2129                         error = ret;
 2130         }
 2131         if (!error && newvp == NULL) {
 2132                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2133                     cnp->cn_cred, cnp->cn_thread, &np);
 2134                 if (!error) {
 2135                         newvp = NFSTOV(np);
 2136                         if (newvp->v_type != VDIR)
 2137                                 error = EEXIST;
 2138                 }
 2139         }
 2140         if (error) {
 2141                 if (newvp)
 2142                         vput(newvp);
 2143                 if (NFS_ISV4(dvp))
 2144                         error = nfscl_maperr(cnp->cn_thread, error,
 2145                             vap->va_uid, vap->va_gid);
 2146         } else {
 2147                 /*
 2148                  * If negative lookup caching is enabled, I might as well
 2149                  * add an entry for this node. Not necessary for correctness,
 2150                  * but if negative caching is enabled, then the system
 2151                  * must care about lookup caching hit rate, so...
 2152                  */
 2153                 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2154                     (cnp->cn_flags & MAKEENTRY) &&
 2155                     attrflag != 0 && dattrflag != 0)
 2156                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 2157                             &dnfsva.na_ctime);
 2158                 *ap->a_vpp = newvp;
 2159         }
 2160         return (error);
 2161 }
 2162 
 2163 /*
 2164  * nfs remove directory call
 2165  */
 2166 static int
 2167 nfs_rmdir(struct vop_rmdir_args *ap)
 2168 {
 2169         struct vnode *vp = ap->a_vp;
 2170         struct vnode *dvp = ap->a_dvp;
 2171         struct componentname *cnp = ap->a_cnp;
 2172         struct nfsnode *dnp;
 2173         struct nfsvattr dnfsva;
 2174         int error, dattrflag;
 2175 
 2176         if (dvp == vp)
 2177                 return (EINVAL);
 2178         error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2179             cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
 2180         dnp = VTONFS(dvp);
 2181         mtx_lock(&dnp->n_mtx);
 2182         dnp->n_flag |= NMODIFIED;
 2183         if (dattrflag != 0) {
 2184                 mtx_unlock(&dnp->n_mtx);
 2185                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2186         } else {
 2187                 dnp->n_attrstamp = 0;
 2188                 mtx_unlock(&dnp->n_mtx);
 2189                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2190         }
 2191 
 2192         cache_purge(dvp);
 2193         cache_purge(vp);
 2194         if (error && NFS_ISV4(dvp))
 2195                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2196                     (gid_t)0);
 2197         /*
 2198          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 2199          */
 2200         if (error == ENOENT)
 2201                 error = 0;
 2202         return (error);
 2203 }
 2204 
 2205 /*
 2206  * nfs readdir call
 2207  */
 2208 static int
 2209 nfs_readdir(struct vop_readdir_args *ap)
 2210 {
 2211         struct vnode *vp = ap->a_vp;
 2212         struct nfsnode *np = VTONFS(vp);
 2213         struct uio *uio = ap->a_uio;
 2214         ssize_t tresid, left;
 2215         int error = 0;
 2216         struct vattr vattr;
 2217         
 2218         if (ap->a_eofflag != NULL)
 2219                 *ap->a_eofflag = 0;
 2220         if (vp->v_type != VDIR) 
 2221                 return(EPERM);
 2222 
 2223         /*
 2224          * First, check for hit on the EOF offset cache
 2225          */
 2226         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 2227             (np->n_flag & NMODIFIED) == 0) {
 2228                 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
 2229                         mtx_lock(&np->n_mtx);
 2230                         if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
 2231                             !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 2232                                 mtx_unlock(&np->n_mtx);
 2233                                 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
 2234                                 if (ap->a_eofflag != NULL)
 2235                                         *ap->a_eofflag = 1;
 2236                                 return (0);
 2237                         } else
 2238                                 mtx_unlock(&np->n_mtx);
 2239                 }
 2240         }
 2241 
 2242         /*
 2243          * NFS always guarantees that directory entries don't straddle
 2244          * DIRBLKSIZ boundaries.  As such, we need to limit the size
 2245          * to an exact multiple of DIRBLKSIZ, to avoid copying a partial
 2246          * directory entry.
 2247          */
 2248         left = uio->uio_resid % DIRBLKSIZ;
 2249         if (left == uio->uio_resid)
 2250                 return (EINVAL);
 2251         uio->uio_resid -= left;
 2252 
 2253         /*
 2254          * Call ncl_bioread() to do the real work.
 2255          */
 2256         tresid = uio->uio_resid;
 2257         error = ncl_bioread(vp, uio, 0, ap->a_cred);
 2258 
 2259         if (!error && uio->uio_resid == tresid) {
 2260                 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
 2261                 if (ap->a_eofflag != NULL)
 2262                         *ap->a_eofflag = 1;
 2263         }
 2264         
 2265         /* Add the partial DIRBLKSIZ (left) back in. */
 2266         uio->uio_resid += left;
 2267         return (error);
 2268 }
 2269 
 2270 /*
 2271  * Readdir rpc call.
 2272  * Called from below the buffer cache by ncl_doio().
 2273  */
 2274 int
 2275 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2276     struct thread *td)
 2277 {
 2278         struct nfsvattr nfsva;
 2279         nfsuint64 *cookiep, cookie;
 2280         struct nfsnode *dnp = VTONFS(vp);
 2281         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2282         int error = 0, eof, attrflag;
 2283 
 2284         KASSERT(uiop->uio_iovcnt == 1 &&
 2285             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2286             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2287             ("nfs readdirrpc bad uio"));
 2288 
 2289         /*
 2290          * If there is no cookie, assume directory was stale.
 2291          */
 2292         ncl_dircookie_lock(dnp);
 2293         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2294         if (cookiep) {
 2295                 cookie = *cookiep;
 2296                 ncl_dircookie_unlock(dnp);
 2297         } else {
 2298                 ncl_dircookie_unlock(dnp);              
 2299                 return (NFSERR_BAD_COOKIE);
 2300         }
 2301 
 2302         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2303                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2304 
 2305         error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
 2306             &attrflag, &eof, NULL);
 2307         if (attrflag)
 2308                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2309 
 2310         if (!error) {
 2311                 /*
 2312                  * We are now either at the end of the directory or have filled
 2313                  * the block.
 2314                  */
 2315                 if (eof)
 2316                         dnp->n_direofoffset = uiop->uio_offset;
 2317                 else {
 2318                         if (uiop->uio_resid > 0)
 2319                                 ncl_printf("EEK! readdirrpc resid > 0\n");
 2320                         ncl_dircookie_lock(dnp);
 2321                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2322                         *cookiep = cookie;
 2323                         ncl_dircookie_unlock(dnp);
 2324                 }
 2325         } else if (NFS_ISV4(vp)) {
 2326                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2327         }
 2328         return (error);
 2329 }
 2330 
 2331 /*
 2332  * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
 2333  */
 2334 int
 2335 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2336     struct thread *td)
 2337 {
 2338         struct nfsvattr nfsva;
 2339         nfsuint64 *cookiep, cookie;
 2340         struct nfsnode *dnp = VTONFS(vp);
 2341         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2342         int error = 0, attrflag, eof;
 2343 
 2344         KASSERT(uiop->uio_iovcnt == 1 &&
 2345             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2346             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2347             ("nfs readdirplusrpc bad uio"));
 2348 
 2349         /*
 2350          * If there is no cookie, assume directory was stale.
 2351          */
 2352         ncl_dircookie_lock(dnp);
 2353         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2354         if (cookiep) {
 2355                 cookie = *cookiep;
 2356                 ncl_dircookie_unlock(dnp);
 2357         } else {
 2358                 ncl_dircookie_unlock(dnp);
 2359                 return (NFSERR_BAD_COOKIE);
 2360         }
 2361 
 2362         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2363                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2364         error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
 2365             &attrflag, &eof, NULL);
 2366         if (attrflag)
 2367                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2368 
 2369         if (!error) {
 2370                 /*
 2371                  * We are now either at end of the directory or have filled the
 2372                  * the block.
 2373                  */
 2374                 if (eof)
 2375                         dnp->n_direofoffset = uiop->uio_offset;
 2376                 else {
 2377                         if (uiop->uio_resid > 0)
 2378                                 ncl_printf("EEK! readdirplusrpc resid > 0\n");
 2379                         ncl_dircookie_lock(dnp);
 2380                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2381                         *cookiep = cookie;
 2382                         ncl_dircookie_unlock(dnp);
 2383                 }
 2384         } else if (NFS_ISV4(vp)) {
 2385                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2386         }
 2387         return (error);
 2388 }
 2389 
 2390 /*
 2391  * Silly rename. To make the NFS filesystem that is stateless look a little
 2392  * more like the "ufs" a remove of an active vnode is translated to a rename
 2393  * to a funny looking filename that is removed by nfs_inactive on the
 2394  * nfsnode. There is the potential for another process on a different client
 2395  * to create the same funny name between the nfs_lookitup() fails and the
 2396  * nfs_rename() completes, but...
 2397  */
 2398 static int
 2399 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2400 {
 2401         struct sillyrename *sp;
 2402         struct nfsnode *np;
 2403         int error;
 2404         short pid;
 2405         unsigned int lticks;
 2406 
 2407         cache_purge(dvp);
 2408         np = VTONFS(vp);
 2409         KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
 2410         MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
 2411             M_NEWNFSREQ, M_WAITOK);
 2412         sp->s_cred = crhold(cnp->cn_cred);
 2413         sp->s_dvp = dvp;
 2414         VREF(dvp);
 2415 
 2416         /* 
 2417          * Fudge together a funny name.
 2418          * Changing the format of the funny name to accomodate more 
 2419          * sillynames per directory.
 2420          * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 
 2421          * CPU ticks since boot.
 2422          */
 2423         pid = cnp->cn_thread->td_proc->p_pid;
 2424         lticks = (unsigned int)ticks;
 2425         for ( ; ; ) {
 2426                 sp->s_namlen = sprintf(sp->s_name, 
 2427                                        ".nfs.%08x.%04x4.4", lticks, 
 2428                                        pid);
 2429                 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2430                                  cnp->cn_thread, NULL))
 2431                         break;
 2432                 lticks++;
 2433         }
 2434         error = nfs_renameit(dvp, vp, cnp, sp);
 2435         if (error)
 2436                 goto bad;
 2437         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2438                 cnp->cn_thread, &np);
 2439         np->n_sillyrename = sp;
 2440         return (0);
 2441 bad:
 2442         vrele(sp->s_dvp);
 2443         crfree(sp->s_cred);
 2444         free((caddr_t)sp, M_NEWNFSREQ);
 2445         return (error);
 2446 }
 2447 
 2448 /*
 2449  * Look up a file name and optionally either update the file handle or
 2450  * allocate an nfsnode, depending on the value of npp.
 2451  * npp == NULL  --> just do the lookup
 2452  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2453  *                      handled too
 2454  * *npp != NULL --> update the file handle in the vnode
 2455  */
 2456 static int
 2457 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
 2458     struct thread *td, struct nfsnode **npp)
 2459 {
 2460         struct vnode *newvp = NULL, *vp;
 2461         struct nfsnode *np, *dnp = VTONFS(dvp);
 2462         struct nfsfh *nfhp, *onfhp;
 2463         struct nfsvattr nfsva, dnfsva;
 2464         struct componentname cn;
 2465         int error = 0, attrflag, dattrflag;
 2466         u_int hash;
 2467 
 2468         error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
 2469             &nfhp, &attrflag, &dattrflag, NULL);
 2470         if (dattrflag)
 2471                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2472         if (npp && !error) {
 2473                 if (*npp != NULL) {
 2474                     np = *npp;
 2475                     vp = NFSTOV(np);
 2476                     /*
 2477                      * For NFSv4, check to see if it is the same name and
 2478                      * replace the name, if it is different.
 2479                      */
 2480                     if (np->n_v4 != NULL && nfsva.na_type == VREG &&
 2481                         (np->n_v4->n4_namelen != len ||
 2482                          NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
 2483                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
 2484                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2485                          dnp->n_fhp->nfh_len))) {
 2486 #ifdef notdef
 2487 { char nnn[100]; int nnnl;
 2488 nnnl = (len < 100) ? len : 99;
 2489 bcopy(name, nnn, nnnl);
 2490 nnn[nnnl] = '\0';
 2491 printf("replace=%s\n",nnn);
 2492 }
 2493 #endif
 2494                             FREE((caddr_t)np->n_v4, M_NFSV4NODE);
 2495                             MALLOC(np->n_v4, struct nfsv4node *,
 2496                                 sizeof (struct nfsv4node) +
 2497                                 dnp->n_fhp->nfh_len + len - 1,
 2498                                 M_NFSV4NODE, M_WAITOK);
 2499                             np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
 2500                             np->n_v4->n4_namelen = len;
 2501                             NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2502                                 dnp->n_fhp->nfh_len);
 2503                             NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
 2504                     }
 2505                     hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
 2506                         FNV1_32_INIT);
 2507                     onfhp = np->n_fhp;
 2508                     /*
 2509                      * Rehash node for new file handle.
 2510                      */
 2511                     vfs_hash_rehash(vp, hash);
 2512                     np->n_fhp = nfhp;
 2513                     if (onfhp != NULL)
 2514                         FREE((caddr_t)onfhp, M_NFSFH);
 2515                     newvp = NFSTOV(np);
 2516                 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
 2517                     FREE((caddr_t)nfhp, M_NFSFH);
 2518                     VREF(dvp);
 2519                     newvp = dvp;
 2520                 } else {
 2521                     cn.cn_nameptr = name;
 2522                     cn.cn_namelen = len;
 2523                     error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
 2524                         &np, NULL, LK_EXCLUSIVE);
 2525                     if (error)
 2526                         return (error);
 2527                     newvp = NFSTOV(np);
 2528                 }
 2529                 if (!attrflag && *npp == NULL) {
 2530                         if (newvp == dvp)
 2531                                 vrele(newvp);
 2532                         else
 2533                                 vput(newvp);
 2534                         return (ENOENT);
 2535                 }
 2536                 if (attrflag)
 2537                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2538                             0, 1);
 2539         }
 2540         if (npp && *npp == NULL) {
 2541                 if (error) {
 2542                         if (newvp) {
 2543                                 if (newvp == dvp)
 2544                                         vrele(newvp);
 2545                                 else
 2546                                         vput(newvp);
 2547                         }
 2548                 } else
 2549                         *npp = np;
 2550         }
 2551         if (error && NFS_ISV4(dvp))
 2552                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2553         return (error);
 2554 }
 2555 
 2556 /*
 2557  * Nfs Version 3 and 4 commit rpc
 2558  */
 2559 int
 2560 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2561    struct thread *td)
 2562 {
 2563         struct nfsvattr nfsva;
 2564         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2565         int error, attrflag;
 2566 
 2567         mtx_lock(&nmp->nm_mtx);
 2568         if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
 2569                 mtx_unlock(&nmp->nm_mtx);
 2570                 return (0);
 2571         }
 2572         mtx_unlock(&nmp->nm_mtx);
 2573         error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
 2574             &attrflag, NULL);
 2575         if (attrflag != 0)
 2576                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
 2577                     0, 1);
 2578         if (error != 0 && NFS_ISV4(vp))
 2579                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2580         return (error);
 2581 }
 2582 
 2583 /*
 2584  * Strategy routine.
 2585  * For async requests when nfsiod(s) are running, queue the request by
 2586  * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
 2587  * request.
 2588  */
 2589 static int
 2590 nfs_strategy(struct vop_strategy_args *ap)
 2591 {
 2592         struct buf *bp = ap->a_bp;
 2593         struct ucred *cr;
 2594 
 2595         KASSERT(!(bp->b_flags & B_DONE),
 2596             ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2597         BUF_ASSERT_HELD(bp);
 2598 
 2599         if (bp->b_iocmd == BIO_READ)
 2600                 cr = bp->b_rcred;
 2601         else
 2602                 cr = bp->b_wcred;
 2603 
 2604         /*
 2605          * If the op is asynchronous and an i/o daemon is waiting
 2606          * queue the request, wake it up and wait for completion
 2607          * otherwise just do it ourselves.
 2608          */
 2609         if ((bp->b_flags & B_ASYNC) == 0 ||
 2610             ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
 2611                 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
 2612         return (0);
 2613 }
 2614 
 2615 /*
 2616  * fsync vnode op. Just call ncl_flush() with commit == 1.
 2617  */
 2618 /* ARGSUSED */
 2619 static int
 2620 nfs_fsync(struct vop_fsync_args *ap)
 2621 {
 2622 
 2623         if (ap->a_vp->v_type != VREG) {
 2624                 /*
 2625                  * For NFS, metadata is changed synchronously on the server,
 2626                  * so there is nothing to flush. Also, ncl_flush() clears
 2627                  * the NMODIFIED flag and that shouldn't be done here for
 2628                  * directories.
 2629                  */
 2630                 return (0);
 2631         }
 2632         return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0));
 2633 }
 2634 
 2635 /*
 2636  * Flush all the blocks associated with a vnode.
 2637  *      Walk through the buffer pool and push any dirty pages
 2638  *      associated with the vnode.
 2639  * If the called_from_renewthread argument is TRUE, it has been called
 2640  * from the NFSv4 renew thread and, as such, cannot block indefinitely
 2641  * waiting for a buffer write to complete.
 2642  */
 2643 int
 2644 ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td,
 2645     int commit, int called_from_renewthread)
 2646 {
 2647         struct nfsnode *np = VTONFS(vp);
 2648         struct buf *bp;
 2649         int i;
 2650         struct buf *nbp;
 2651         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2652         int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2653         int passone = 1, trycnt = 0;
 2654         u_quad_t off, endoff, toff;
 2655         struct ucred* wcred = NULL;
 2656         struct buf **bvec = NULL;
 2657         struct bufobj *bo;
 2658 #ifndef NFS_COMMITBVECSIZ
 2659 #define NFS_COMMITBVECSIZ       20
 2660 #endif
 2661         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2662         int bvecsize = 0, bveccount;
 2663 
 2664         if (called_from_renewthread != 0)
 2665                 slptimeo = hz;
 2666         if (nmp->nm_flag & NFSMNT_INT)
 2667                 slpflag = PCATCH;
 2668         if (!commit)
 2669                 passone = 0;
 2670         bo = &vp->v_bufobj;
 2671         /*
 2672          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2673          * server, but has not been committed to stable storage on the server
 2674          * yet. On the first pass, the byte range is worked out and the commit
 2675          * rpc is done. On the second pass, ncl_writebp() is called to do the
 2676          * job.
 2677          */
 2678 again:
 2679         off = (u_quad_t)-1;
 2680         endoff = 0;
 2681         bvecpos = 0;
 2682         if (NFS_ISV34(vp) && commit) {
 2683                 if (bvec != NULL && bvec != bvec_on_stack)
 2684                         free(bvec, M_TEMP);
 2685                 /*
 2686                  * Count up how many buffers waiting for a commit.
 2687                  */
 2688                 bveccount = 0;
 2689                 BO_LOCK(bo);
 2690                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2691                         if (!BUF_ISLOCKED(bp) &&
 2692                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2693                                 == (B_DELWRI | B_NEEDCOMMIT))
 2694                                 bveccount++;
 2695                 }
 2696                 /*
 2697                  * Allocate space to remember the list of bufs to commit.  It is
 2698                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 2699                  * If we can't get memory (for whatever reason), we will end up
 2700                  * committing the buffers one-by-one in the loop below.
 2701                  */
 2702                 if (bveccount > NFS_COMMITBVECSIZ) {
 2703                         /*
 2704                          * Release the vnode interlock to avoid a lock
 2705                          * order reversal.
 2706                          */
 2707                         BO_UNLOCK(bo);
 2708                         bvec = (struct buf **)
 2709                                 malloc(bveccount * sizeof(struct buf *),
 2710                                        M_TEMP, M_NOWAIT);
 2711                         BO_LOCK(bo);
 2712                         if (bvec == NULL) {
 2713                                 bvec = bvec_on_stack;
 2714                                 bvecsize = NFS_COMMITBVECSIZ;
 2715                         } else
 2716                                 bvecsize = bveccount;
 2717                 } else {
 2718                         bvec = bvec_on_stack;
 2719                         bvecsize = NFS_COMMITBVECSIZ;
 2720                 }
 2721                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2722                         if (bvecpos >= bvecsize)
 2723                                 break;
 2724                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2725                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2726                                 continue;
 2727                         }
 2728                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2729                             (B_DELWRI | B_NEEDCOMMIT)) {
 2730                                 BUF_UNLOCK(bp);
 2731                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2732                                 continue;
 2733                         }
 2734                         BO_UNLOCK(bo);
 2735                         bremfree(bp);
 2736                         /*
 2737                          * Work out if all buffers are using the same cred
 2738                          * so we can deal with them all with one commit.
 2739                          *
 2740                          * NOTE: we are not clearing B_DONE here, so we have
 2741                          * to do it later on in this routine if we intend to
 2742                          * initiate I/O on the bp.
 2743                          *
 2744                          * Note: to avoid loopback deadlocks, we do not
 2745                          * assign b_runningbufspace.
 2746                          */
 2747                         if (wcred == NULL)
 2748                                 wcred = bp->b_wcred;
 2749                         else if (wcred != bp->b_wcred)
 2750                                 wcred = NOCRED;
 2751                         vfs_busy_pages(bp, 1);
 2752 
 2753                         BO_LOCK(bo);
 2754                         /*
 2755                          * bp is protected by being locked, but nbp is not
 2756                          * and vfs_busy_pages() may sleep.  We have to
 2757                          * recalculate nbp.
 2758                          */
 2759                         nbp = TAILQ_NEXT(bp, b_bobufs);
 2760 
 2761                         /*
 2762                          * A list of these buffers is kept so that the
 2763                          * second loop knows which buffers have actually
 2764                          * been committed. This is necessary, since there
 2765                          * may be a race between the commit rpc and new
 2766                          * uncommitted writes on the file.
 2767                          */
 2768                         bvec[bvecpos++] = bp;
 2769                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2770                                 bp->b_dirtyoff;
 2771                         if (toff < off)
 2772                                 off = toff;
 2773                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2774                         if (toff > endoff)
 2775                                 endoff = toff;
 2776                 }
 2777                 BO_UNLOCK(bo);
 2778         }
 2779         if (bvecpos > 0) {
 2780                 /*
 2781                  * Commit data on the server, as required.
 2782                  * If all bufs are using the same wcred, then use that with
 2783                  * one call for all of them, otherwise commit each one
 2784                  * separately.
 2785                  */
 2786                 if (wcred != NOCRED)
 2787                         retv = ncl_commit(vp, off, (int)(endoff - off),
 2788                                           wcred, td);
 2789                 else {
 2790                         retv = 0;
 2791                         for (i = 0; i < bvecpos; i++) {
 2792                                 off_t off, size;
 2793                                 bp = bvec[i];
 2794                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2795                                         bp->b_dirtyoff;
 2796                                 size = (u_quad_t)(bp->b_dirtyend
 2797                                                   - bp->b_dirtyoff);
 2798                                 retv = ncl_commit(vp, off, (int)size,
 2799                                                   bp->b_wcred, td);
 2800                                 if (retv) break;
 2801                         }
 2802                 }
 2803 
 2804                 if (retv == NFSERR_STALEWRITEVERF)
 2805                         ncl_clearcommit(vp->v_mount);
 2806 
 2807                 /*
 2808                  * Now, either mark the blocks I/O done or mark the
 2809                  * blocks dirty, depending on whether the commit
 2810                  * succeeded.
 2811                  */
 2812                 for (i = 0; i < bvecpos; i++) {
 2813                         bp = bvec[i];
 2814                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 2815                         if (retv) {
 2816                                 /*
 2817                                  * Error, leave B_DELWRI intact
 2818                                  */
 2819                                 vfs_unbusy_pages(bp);
 2820                                 brelse(bp);
 2821                         } else {
 2822                                 /*
 2823                                  * Success, remove B_DELWRI ( bundirty() ).
 2824                                  *
 2825                                  * b_dirtyoff/b_dirtyend seem to be NFS
 2826                                  * specific.  We should probably move that
 2827                                  * into bundirty(). XXX
 2828                                  */
 2829                                 bufobj_wref(bo);
 2830                                 bp->b_flags |= B_ASYNC;
 2831                                 bundirty(bp);
 2832                                 bp->b_flags &= ~B_DONE;
 2833                                 bp->b_ioflags &= ~BIO_ERROR;
 2834                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2835                                 bufdone(bp);
 2836                         }
 2837                 }
 2838         }
 2839 
 2840         /*
 2841          * Start/do any write(s) that are required.
 2842          */
 2843 loop:
 2844         BO_LOCK(bo);
 2845         TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2846                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2847                         if (waitfor != MNT_WAIT || passone)
 2848                                 continue;
 2849 
 2850                         error = BUF_TIMELOCK(bp,
 2851                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 2852                             BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
 2853                         if (error == 0) {
 2854                                 BUF_UNLOCK(bp);
 2855                                 goto loop;
 2856                         }
 2857                         if (error == ENOLCK) {
 2858                                 error = 0;
 2859                                 goto loop;
 2860                         }
 2861                         if (called_from_renewthread != 0) {
 2862                                 /*
 2863                                  * Return EIO so the flush will be retried
 2864                                  * later.
 2865                                  */
 2866                                 error = EIO;
 2867                                 goto done;
 2868                         }
 2869                         if (newnfs_sigintr(nmp, td)) {
 2870                                 error = EINTR;
 2871                                 goto done;
 2872                         }
 2873                         if (slpflag == PCATCH) {
 2874                                 slpflag = 0;
 2875                                 slptimeo = 2 * hz;
 2876                         }
 2877                         goto loop;
 2878                 }
 2879                 if ((bp->b_flags & B_DELWRI) == 0)
 2880                         panic("nfs_fsync: not dirty");
 2881                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 2882                         BUF_UNLOCK(bp);
 2883                         continue;
 2884                 }
 2885                 BO_UNLOCK(bo);
 2886                 bremfree(bp);
 2887                 if (passone || !commit)
 2888                     bp->b_flags |= B_ASYNC;
 2889                 else
 2890                     bp->b_flags |= B_ASYNC;
 2891                 bwrite(bp);
 2892                 if (newnfs_sigintr(nmp, td)) {
 2893                         error = EINTR;
 2894                         goto done;
 2895                 }
 2896                 goto loop;
 2897         }
 2898         if (passone) {
 2899                 passone = 0;
 2900                 BO_UNLOCK(bo);
 2901                 goto again;
 2902         }
 2903         if (waitfor == MNT_WAIT) {
 2904                 while (bo->bo_numoutput) {
 2905                         error = bufobj_wwait(bo, slpflag, slptimeo);
 2906                         if (error) {
 2907                             BO_UNLOCK(bo);
 2908                             if (called_from_renewthread != 0) {
 2909                                 /*
 2910                                  * Return EIO so that the flush will be
 2911                                  * retried later.
 2912                                  */
 2913                                 error = EIO;
 2914                                 goto done;
 2915                             }
 2916                             error = newnfs_sigintr(nmp, td);
 2917                             if (error)
 2918                                 goto done;
 2919                             if (slpflag == PCATCH) {
 2920                                 slpflag = 0;
 2921                                 slptimeo = 2 * hz;
 2922                             }
 2923                             BO_LOCK(bo);
 2924                         }
 2925                 }
 2926                 if (bo->bo_dirty.bv_cnt != 0 && commit) {
 2927                         BO_UNLOCK(bo);
 2928                         goto loop;
 2929                 }
 2930                 /*
 2931                  * Wait for all the async IO requests to drain
 2932                  */
 2933                 BO_UNLOCK(bo);
 2934                 mtx_lock(&np->n_mtx);
 2935                 while (np->n_directio_asyncwr > 0) {
 2936                         np->n_flag |= NFSYNCWAIT;
 2937                         error = newnfs_msleep(td, &np->n_directio_asyncwr,
 2938                             &np->n_mtx, slpflag | (PRIBIO + 1), 
 2939                             "nfsfsync", 0);
 2940                         if (error) {
 2941                                 if (newnfs_sigintr(nmp, td)) {
 2942                                         mtx_unlock(&np->n_mtx);
 2943                                         error = EINTR;  
 2944                                         goto done;
 2945                                 }
 2946                         }
 2947                 }
 2948                 mtx_unlock(&np->n_mtx);
 2949         } else
 2950                 BO_UNLOCK(bo);
 2951         if (NFSHASPNFS(nmp)) {
 2952                 nfscl_layoutcommit(vp, td);
 2953                 /*
 2954                  * Invalidate the attribute cache, since writes to a DS
 2955                  * won't update the size attribute.
 2956                  */
 2957                 mtx_lock(&np->n_mtx);
 2958                 np->n_attrstamp = 0;
 2959         } else
 2960                 mtx_lock(&np->n_mtx);
 2961         if (np->n_flag & NWRITEERR) {
 2962                 error = np->n_error;
 2963                 np->n_flag &= ~NWRITEERR;
 2964         }
 2965         if (commit && bo->bo_dirty.bv_cnt == 0 &&
 2966             bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
 2967                 np->n_flag &= ~NMODIFIED;
 2968         mtx_unlock(&np->n_mtx);
 2969 done:
 2970         if (bvec != NULL && bvec != bvec_on_stack)
 2971                 free(bvec, M_TEMP);
 2972         if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
 2973             (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
 2974              np->n_directio_asyncwr != 0) && trycnt++ < 5) {
 2975                 /* try, try again... */
 2976                 passone = 1;
 2977                 wcred = NULL;
 2978                 bvec = NULL;
 2979                 bvecsize = 0;
 2980 printf("try%d\n", trycnt);
 2981                 goto again;
 2982         }
 2983         return (error);
 2984 }
 2985 
 2986 /*
 2987  * NFS advisory byte-level locks.
 2988  */
 2989 static int
 2990 nfs_advlock(struct vop_advlock_args *ap)
 2991 {
 2992         struct vnode *vp = ap->a_vp;
 2993         struct ucred *cred;
 2994         struct nfsnode *np = VTONFS(ap->a_vp);
 2995         struct proc *p = (struct proc *)ap->a_id;
 2996         struct thread *td = curthread;  /* XXX */
 2997         struct vattr va;
 2998         int ret, error = EOPNOTSUPP;
 2999         u_quad_t size;
 3000         
 3001         if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
 3002                 if (vp->v_type != VREG)
 3003                         return (EINVAL);
 3004                 if ((ap->a_flags & F_POSIX) != 0)
 3005                         cred = p->p_ucred;
 3006                 else
 3007                         cred = td->td_ucred;
 3008                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 3009                 if (vp->v_iflag & VI_DOOMED) {
 3010                         NFSVOPUNLOCK(vp, 0);
 3011                         return (EBADF);
 3012                 }
 3013 
 3014                 /*
 3015                  * If this is unlocking a write locked region, flush and
 3016                  * commit them before unlocking. This is required by
 3017                  * RFC3530 Sec. 9.3.2.
 3018                  */
 3019                 if (ap->a_op == F_UNLCK &&
 3020                     nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
 3021                     ap->a_flags))
 3022                         (void) ncl_flush(vp, MNT_WAIT, cred, td, 1, 0);
 3023 
 3024                 /*
 3025                  * Loop around doing the lock op, while a blocking lock
 3026                  * must wait for the lock op to succeed.
 3027                  */
 3028                 do {
 3029                         ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
 3030                             ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
 3031                         if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3032                             ap->a_op == F_SETLK) {
 3033                                 NFSVOPUNLOCK(vp, 0);
 3034                                 error = nfs_catnap(PZERO | PCATCH, ret,
 3035                                     "ncladvl");
 3036                                 if (error)
 3037                                         return (EINTR);
 3038                                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 3039                                 if (vp->v_iflag & VI_DOOMED) {
 3040                                         NFSVOPUNLOCK(vp, 0);
 3041                                         return (EBADF);
 3042                                 }
 3043                         }
 3044                 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3045                      ap->a_op == F_SETLK);
 3046                 if (ret == NFSERR_DENIED) {
 3047                         NFSVOPUNLOCK(vp, 0);
 3048                         return (EAGAIN);
 3049                 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
 3050                         NFSVOPUNLOCK(vp, 0);
 3051                         return (ret);
 3052                 } else if (ret != 0) {
 3053                         NFSVOPUNLOCK(vp, 0);
 3054                         return (EACCES);
 3055                 }
 3056 
 3057                 /*
 3058                  * Now, if we just got a lock, invalidate data in the buffer
 3059                  * cache, as required, so that the coherency conforms with
 3060                  * RFC3530 Sec. 9.3.2.
 3061                  */
 3062                 if (ap->a_op == F_SETLK) {
 3063                         if ((np->n_flag & NMODIFIED) == 0) {
 3064                                 np->n_attrstamp = 0;
 3065                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3066                                 ret = VOP_GETATTR(vp, &va, cred);
 3067                         }
 3068                         if ((np->n_flag & NMODIFIED) || ret ||
 3069                             np->n_change != va.va_filerev) {
 3070                                 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
 3071                                 np->n_attrstamp = 0;
 3072                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3073                                 ret = VOP_GETATTR(vp, &va, cred);
 3074                                 if (!ret) {
 3075                                         np->n_mtime = va.va_mtime;
 3076                                         np->n_change = va.va_filerev;
 3077                                 }
 3078                         }
 3079                         /* Mark that a file lock has been acquired. */
 3080                         mtx_lock(&np->n_mtx);
 3081                         np->n_flag |= NHASBEENLOCKED;
 3082                         mtx_unlock(&np->n_mtx);
 3083                 }
 3084                 NFSVOPUNLOCK(vp, 0);
 3085                 return (0);
 3086         } else if (!NFS_ISV4(vp)) {
 3087                 error = NFSVOPLOCK(vp, LK_SHARED);
 3088                 if (error)
 3089                         return (error);
 3090                 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3091                         size = VTONFS(vp)->n_size;
 3092                         NFSVOPUNLOCK(vp, 0);
 3093                         error = lf_advlock(ap, &(vp->v_lockf), size);
 3094                 } else {
 3095                         if (nfs_advlock_p != NULL)
 3096                                 error = nfs_advlock_p(ap);
 3097                         else {
 3098                                 NFSVOPUNLOCK(vp, 0);
 3099                                 error = ENOLCK;
 3100                         }
 3101                 }
 3102                 if (error == 0 && ap->a_op == F_SETLK) {
 3103                         /* Mark that a file lock has been acquired. */
 3104                         mtx_lock(&np->n_mtx);
 3105                         np->n_flag |= NHASBEENLOCKED;
 3106                         mtx_unlock(&np->n_mtx);
 3107                 }
 3108         }
 3109         return (error);
 3110 }
 3111 
 3112 /*
 3113  * NFS advisory byte-level locks.
 3114  */
 3115 static int
 3116 nfs_advlockasync(struct vop_advlockasync_args *ap)
 3117 {
 3118         struct vnode *vp = ap->a_vp;
 3119         u_quad_t size;
 3120         int error;
 3121         
 3122         if (NFS_ISV4(vp))
 3123                 return (EOPNOTSUPP);
 3124         error = NFSVOPLOCK(vp, LK_SHARED);
 3125         if (error)
 3126                 return (error);
 3127         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3128                 size = VTONFS(vp)->n_size;
 3129                 NFSVOPUNLOCK(vp, 0);
 3130                 error = lf_advlockasync(ap, &(vp->v_lockf), size);
 3131         } else {
 3132                 NFSVOPUNLOCK(vp, 0);
 3133                 error = EOPNOTSUPP;
 3134         }
 3135         return (error);
 3136 }
 3137 
 3138 /*
 3139  * Print out the contents of an nfsnode.
 3140  */
 3141 static int
 3142 nfs_print(struct vop_print_args *ap)
 3143 {
 3144         struct vnode *vp = ap->a_vp;
 3145         struct nfsnode *np = VTONFS(vp);
 3146 
 3147         ncl_printf("\tfileid %ld fsid 0x%x",
 3148            np->n_vattr.na_fileid, np->n_vattr.na_fsid);
 3149         if (vp->v_type == VFIFO)
 3150                 fifo_printinfo(vp);
 3151         printf("\n");
 3152         return (0);
 3153 }
 3154 
 3155 /*
 3156  * This is the "real" nfs::bwrite(struct buf*).
 3157  * We set B_CACHE if this is a VMIO buffer.
 3158  */
 3159 int
 3160 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
 3161 {
 3162         int s;
 3163         int oldflags = bp->b_flags;
 3164 #if 0
 3165         int retv = 1;
 3166         off_t off;
 3167 #endif
 3168 
 3169         BUF_ASSERT_HELD(bp);
 3170 
 3171         if (bp->b_flags & B_INVAL) {
 3172                 brelse(bp);
 3173                 return(0);
 3174         }
 3175 
 3176         bp->b_flags |= B_CACHE;
 3177 
 3178         /*
 3179          * Undirty the bp.  We will redirty it later if the I/O fails.
 3180          */
 3181 
 3182         s = splbio();
 3183         bundirty(bp);
 3184         bp->b_flags &= ~B_DONE;
 3185         bp->b_ioflags &= ~BIO_ERROR;
 3186         bp->b_iocmd = BIO_WRITE;
 3187 
 3188         bufobj_wref(bp->b_bufobj);
 3189         curthread->td_ru.ru_oublock++;
 3190         splx(s);
 3191 
 3192         /*
 3193          * Note: to avoid loopback deadlocks, we do not
 3194          * assign b_runningbufspace.
 3195          */
 3196         vfs_busy_pages(bp, 1);
 3197 
 3198         BUF_KERNPROC(bp);
 3199         bp->b_iooffset = dbtob(bp->b_blkno);
 3200         bstrategy(bp);
 3201 
 3202         if( (oldflags & B_ASYNC) == 0) {
 3203                 int rtval = bufwait(bp);
 3204 
 3205                 if (oldflags & B_DELWRI) {
 3206                         s = splbio();
 3207                         reassignbuf(bp);
 3208                         splx(s);
 3209                 }
 3210                 brelse(bp);
 3211                 return (rtval);
 3212         }
 3213 
 3214         return (0);
 3215 }
 3216 
 3217 /*
 3218  * nfs special file access vnode op.
 3219  * Essentially just get vattr and then imitate iaccess() since the device is
 3220  * local to the client.
 3221  */
 3222 static int
 3223 nfsspec_access(struct vop_access_args *ap)
 3224 {
 3225         struct vattr *vap;
 3226         struct ucred *cred = ap->a_cred;
 3227         struct vnode *vp = ap->a_vp;
 3228         accmode_t accmode = ap->a_accmode;
 3229         struct vattr vattr;
 3230         int error;
 3231 
 3232         /*
 3233          * Disallow write attempts on filesystems mounted read-only;
 3234          * unless the file is a socket, fifo, or a block or character
 3235          * device resident on the filesystem.
 3236          */
 3237         if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3238                 switch (vp->v_type) {
 3239                 case VREG:
 3240                 case VDIR:
 3241                 case VLNK:
 3242                         return (EROFS);
 3243                 default:
 3244                         break;
 3245                 }
 3246         }
 3247         vap = &vattr;
 3248         error = VOP_GETATTR(vp, vap, cred);
 3249         if (error)
 3250                 goto out;
 3251         error  = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
 3252             accmode, cred, NULL);
 3253 out:
 3254         return error;
 3255 }
 3256 
 3257 /*
 3258  * Read wrapper for fifos.
 3259  */
 3260 static int
 3261 nfsfifo_read(struct vop_read_args *ap)
 3262 {
 3263         struct nfsnode *np = VTONFS(ap->a_vp);
 3264         int error;
 3265 
 3266         /*
 3267          * Set access flag.
 3268          */
 3269         mtx_lock(&np->n_mtx);
 3270         np->n_flag |= NACC;
 3271         vfs_timestamp(&np->n_atim);
 3272         mtx_unlock(&np->n_mtx);
 3273         error = fifo_specops.vop_read(ap);
 3274         return error;   
 3275 }
 3276 
 3277 /*
 3278  * Write wrapper for fifos.
 3279  */
 3280 static int
 3281 nfsfifo_write(struct vop_write_args *ap)
 3282 {
 3283         struct nfsnode *np = VTONFS(ap->a_vp);
 3284 
 3285         /*
 3286          * Set update flag.
 3287          */
 3288         mtx_lock(&np->n_mtx);
 3289         np->n_flag |= NUPD;
 3290         vfs_timestamp(&np->n_mtim);
 3291         mtx_unlock(&np->n_mtx);
 3292         return(fifo_specops.vop_write(ap));
 3293 }
 3294 
 3295 /*
 3296  * Close wrapper for fifos.
 3297  *
 3298  * Update the times on the nfsnode then do fifo close.
 3299  */
 3300 static int
 3301 nfsfifo_close(struct vop_close_args *ap)
 3302 {
 3303         struct vnode *vp = ap->a_vp;
 3304         struct nfsnode *np = VTONFS(vp);
 3305         struct vattr vattr;
 3306         struct timespec ts;
 3307 
 3308         mtx_lock(&np->n_mtx);
 3309         if (np->n_flag & (NACC | NUPD)) {
 3310                 vfs_timestamp(&ts);
 3311                 if (np->n_flag & NACC)
 3312                         np->n_atim = ts;
 3313                 if (np->n_flag & NUPD)
 3314                         np->n_mtim = ts;
 3315                 np->n_flag |= NCHG;
 3316                 if (vrefcnt(vp) == 1 &&
 3317                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3318                         VATTR_NULL(&vattr);
 3319                         if (np->n_flag & NACC)
 3320                                 vattr.va_atime = np->n_atim;
 3321                         if (np->n_flag & NUPD)
 3322                                 vattr.va_mtime = np->n_mtim;
 3323                         mtx_unlock(&np->n_mtx);
 3324                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 3325                         goto out;
 3326                 }
 3327         }
 3328         mtx_unlock(&np->n_mtx);
 3329 out:
 3330         return (fifo_specops.vop_close(ap));
 3331 }
 3332 
 3333 /*
 3334  * Just call ncl_writebp() with the force argument set to 1.
 3335  *
 3336  * NOTE: B_DONE may or may not be set in a_bp on call.
 3337  */
 3338 static int
 3339 nfs_bwrite(struct buf *bp)
 3340 {
 3341 
 3342         return (ncl_writebp(bp, 1, curthread));
 3343 }
 3344 
 3345 struct buf_ops buf_ops_newnfs = {
 3346         .bop_name       =       "buf_ops_nfs",
 3347         .bop_write      =       nfs_bwrite,
 3348         .bop_strategy   =       bufstrategy,
 3349         .bop_sync       =       bufsync,
 3350         .bop_bdflush    =       bufbdflush,
 3351 };
 3352 
 3353 /*
 3354  * Cloned from vop_stdlock(), and then the ugly hack added.
 3355  */
 3356 static int
 3357 nfs_lock1(struct vop_lock1_args *ap)
 3358 {
 3359         struct vnode *vp = ap->a_vp;
 3360         int error = 0;
 3361 
 3362         /*
 3363          * Since vfs_hash_get() calls vget() and it will no longer work
 3364          * for FreeBSD8 with flags == 0, I can only think of this horrible
 3365          * hack to work around it. I call vfs_hash_get() with LK_EXCLOTHER
 3366          * and then handle it here. All I want for this case is a v_usecount
 3367          * on the vnode to use for recovery, while another thread might
 3368          * hold a lock on the vnode. I have the other threads blocked, so
 3369          * there isn't any race problem.
 3370          */
 3371         if ((ap->a_flags & LK_TYPE_MASK) == LK_EXCLOTHER) {
 3372                 if ((ap->a_flags & LK_INTERLOCK) == 0)
 3373                         panic("ncllock1");
 3374                 if ((vp->v_iflag & VI_DOOMED))
 3375                         error = ENOENT;
 3376                 VI_UNLOCK(vp);
 3377                 return (error);
 3378         }
 3379         return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
 3380             LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
 3381             ap->a_line));
 3382 }
 3383 
 3384 static int
 3385 nfs_getacl(struct vop_getacl_args *ap)
 3386 {
 3387         int error;
 3388 
 3389         if (ap->a_type != ACL_TYPE_NFS4)
 3390                 return (EOPNOTSUPP);
 3391         error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3392             NULL);
 3393         if (error > NFSERR_STALE) {
 3394                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3395                 error = EPERM;
 3396         }
 3397         return (error);
 3398 }
 3399 
 3400 static int
 3401 nfs_setacl(struct vop_setacl_args *ap)
 3402 {
 3403         int error;
 3404 
 3405         if (ap->a_type != ACL_TYPE_NFS4)
 3406                 return (EOPNOTSUPP);
 3407         error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3408             NULL);
 3409         if (error > NFSERR_STALE) {
 3410                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3411                 error = EPERM;
 3412         }
 3413         return (error);
 3414 }
 3415 
 3416 /*
 3417  * Return POSIX pathconf information applicable to nfs filesystems.
 3418  */
 3419 static int
 3420 nfs_pathconf(struct vop_pathconf_args *ap)
 3421 {
 3422         struct nfsv3_pathconf pc;
 3423         struct nfsvattr nfsva;
 3424         struct vnode *vp = ap->a_vp;
 3425         struct thread *td = curthread;
 3426         int attrflag, error;
 3427 
 3428         if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
 3429             ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
 3430             ap->a_name == _PC_NO_TRUNC)) ||
 3431             (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) {
 3432                 /*
 3433                  * Since only the above 4 a_names are returned by the NFSv3
 3434                  * Pathconf RPC, there is no point in doing it for others.
 3435                  * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
 3436                  * be used for _PC_NFS4_ACL as well.
 3437                  */
 3438                 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
 3439                     &attrflag, NULL);
 3440                 if (attrflag != 0)
 3441                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 3442                             1);
 3443                 if (error != 0)
 3444                         return (error);
 3445         } else {
 3446                 /*
 3447                  * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
 3448                  * just fake them.
 3449                  */
 3450                 pc.pc_linkmax = LINK_MAX;
 3451                 pc.pc_namemax = NFS_MAXNAMLEN;
 3452                 pc.pc_notrunc = 1;
 3453                 pc.pc_chownrestricted = 1;
 3454                 pc.pc_caseinsensitive = 0;
 3455                 pc.pc_casepreserving = 1;
 3456                 error = 0;
 3457         }
 3458         switch (ap->a_name) {
 3459         case _PC_LINK_MAX:
 3460                 *ap->a_retval = pc.pc_linkmax;
 3461                 break;
 3462         case _PC_NAME_MAX:
 3463                 *ap->a_retval = pc.pc_namemax;
 3464                 break;
 3465         case _PC_PATH_MAX:
 3466                 *ap->a_retval = PATH_MAX;
 3467                 break;
 3468         case _PC_PIPE_BUF:
 3469                 *ap->a_retval = PIPE_BUF;
 3470                 break;
 3471         case _PC_CHOWN_RESTRICTED:
 3472                 *ap->a_retval = pc.pc_chownrestricted;
 3473                 break;
 3474         case _PC_NO_TRUNC:
 3475                 *ap->a_retval = pc.pc_notrunc;
 3476                 break;
 3477         case _PC_ACL_EXTENDED:
 3478                 *ap->a_retval = 0;
 3479                 break;
 3480         case _PC_ACL_NFS4:
 3481                 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
 3482                     NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
 3483                         *ap->a_retval = 1;
 3484                 else
 3485                         *ap->a_retval = 0;
 3486                 break;
 3487         case _PC_ACL_PATH_MAX:
 3488                 if (NFS_ISV4(vp))
 3489                         *ap->a_retval = ACL_MAX_ENTRIES;
 3490                 else
 3491                         *ap->a_retval = 3;
 3492                 break;
 3493         case _PC_MAC_PRESENT:
 3494                 *ap->a_retval = 0;
 3495                 break;
 3496         case _PC_ASYNC_IO:
 3497                 /* _PC_ASYNC_IO should have been handled by upper layers. */
 3498                 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
 3499                 error = EINVAL;
 3500                 break;
 3501         case _PC_PRIO_IO:
 3502                 *ap->a_retval = 0;
 3503                 break;
 3504         case _PC_SYNC_IO:
 3505                 *ap->a_retval = 0;
 3506                 break;
 3507         case _PC_ALLOC_SIZE_MIN:
 3508                 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
 3509                 break;
 3510         case _PC_FILESIZEBITS:
 3511                 if (NFS_ISV34(vp))
 3512                         *ap->a_retval = 64;
 3513                 else
 3514                         *ap->a_retval = 32;
 3515                 break;
 3516         case _PC_REC_INCR_XFER_SIZE:
 3517                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3518                 break;
 3519         case _PC_REC_MAX_XFER_SIZE:
 3520                 *ap->a_retval = -1; /* means ``unlimited'' */
 3521                 break;
 3522         case _PC_REC_MIN_XFER_SIZE:
 3523                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3524                 break;
 3525         case _PC_REC_XFER_ALIGN:
 3526                 *ap->a_retval = PAGE_SIZE;
 3527                 break;
 3528         case _PC_SYMLINK_MAX:
 3529                 *ap->a_retval = NFS_MAXPATHLEN;
 3530                 break;
 3531 
 3532         default:
 3533                 error = EINVAL;
 3534                 break;
 3535         }
 3536         return (error);
 3537 }
 3538 

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