The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/nfs_clvnops.c

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from nfs_vnops.c        8.16 (Berkeley) 5/27/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/10.0/sys/fs/nfsclient/nfs_clvnops.c 252072 2013-06-21 22:26:18Z 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                         ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
  773                             NULL);
  774                         if (!ret) {
  775                                 np->n_change = nfsva.na_filerev;
  776                                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
  777                                     NULL, 0, 0);
  778                         }
  779                 }
  780 
  781                 /*
  782                  * and do the close.
  783                  */
  784                 ret = nfsrpc_close(vp, 0, ap->a_td);
  785                 if (!error && ret)
  786                         error = ret;
  787                 if (error)
  788                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  789                             (gid_t)0);
  790         }
  791         if (newnfs_directio_enable)
  792                 KASSERT((np->n_directio_asyncwr == 0),
  793                         ("nfs_close: dirty unflushed (%d) directio buffers\n",
  794                          np->n_directio_asyncwr));
  795         if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  796                 mtx_lock(&np->n_mtx);
  797                 KASSERT((np->n_directio_opens > 0), 
  798                         ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
  799                 np->n_directio_opens--;
  800                 if (np->n_directio_opens == 0)
  801                         np->n_flag &= ~NNONCACHE;
  802                 mtx_unlock(&np->n_mtx);
  803         }
  804         if (localcred)
  805                 NFSFREECRED(cred);
  806         return (error);
  807 }
  808 
  809 /*
  810  * nfs getattr call from vfs.
  811  */
  812 static int
  813 nfs_getattr(struct vop_getattr_args *ap)
  814 {
  815         struct vnode *vp = ap->a_vp;
  816         struct thread *td = curthread;  /* XXX */
  817         struct nfsnode *np = VTONFS(vp);
  818         int error = 0;
  819         struct nfsvattr nfsva;
  820         struct vattr *vap = ap->a_vap;
  821         struct vattr vattr;
  822 
  823         /*
  824          * Update local times for special files.
  825          */
  826         mtx_lock(&np->n_mtx);
  827         if (np->n_flag & (NACC | NUPD))
  828                 np->n_flag |= NCHG;
  829         mtx_unlock(&np->n_mtx);
  830         /*
  831          * First look in the cache.
  832          */
  833         if (ncl_getattrcache(vp, &vattr) == 0) {
  834                 vap->va_type = vattr.va_type;
  835                 vap->va_mode = vattr.va_mode;
  836                 vap->va_nlink = vattr.va_nlink;
  837                 vap->va_uid = vattr.va_uid;
  838                 vap->va_gid = vattr.va_gid;
  839                 vap->va_fsid = vattr.va_fsid;
  840                 vap->va_fileid = vattr.va_fileid;
  841                 vap->va_size = vattr.va_size;
  842                 vap->va_blocksize = vattr.va_blocksize;
  843                 vap->va_atime = vattr.va_atime;
  844                 vap->va_mtime = vattr.va_mtime;
  845                 vap->va_ctime = vattr.va_ctime;
  846                 vap->va_gen = vattr.va_gen;
  847                 vap->va_flags = vattr.va_flags;
  848                 vap->va_rdev = vattr.va_rdev;
  849                 vap->va_bytes = vattr.va_bytes;
  850                 vap->va_filerev = vattr.va_filerev;
  851                 /*
  852                  * Get the local modify time for the case of a write
  853                  * delegation.
  854                  */
  855                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  856                 return (0);
  857         }
  858 
  859         if (NFS_ISV34(vp) && nfs_prime_access_cache &&
  860             nfsaccess_cache_timeout > 0) {
  861                 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
  862                 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
  863                 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
  864                         nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
  865                         return (0);
  866                 }
  867         }
  868         error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
  869         if (!error)
  870                 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
  871         if (!error) {
  872                 /*
  873                  * Get the local modify time for the case of a write
  874                  * delegation.
  875                  */
  876                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  877         } else if (NFS_ISV4(vp)) {
  878                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  879         }
  880         return (error);
  881 }
  882 
  883 /*
  884  * nfs setattr call.
  885  */
  886 static int
  887 nfs_setattr(struct vop_setattr_args *ap)
  888 {
  889         struct vnode *vp = ap->a_vp;
  890         struct nfsnode *np = VTONFS(vp);
  891         struct thread *td = curthread;  /* XXX */
  892         struct vattr *vap = ap->a_vap;
  893         int error = 0;
  894         u_quad_t tsize;
  895 
  896 #ifndef nolint
  897         tsize = (u_quad_t)0;
  898 #endif
  899 
  900         /*
  901          * Setting of flags and marking of atimes are not supported.
  902          */
  903         if (vap->va_flags != VNOVAL)
  904                 return (EOPNOTSUPP);
  905 
  906         /*
  907          * Disallow write attempts if the filesystem is mounted read-only.
  908          */
  909         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  910             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  911             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  912             (vp->v_mount->mnt_flag & MNT_RDONLY))
  913                 return (EROFS);
  914         if (vap->va_size != VNOVAL) {
  915                 switch (vp->v_type) {
  916                 case VDIR:
  917                         return (EISDIR);
  918                 case VCHR:
  919                 case VBLK:
  920                 case VSOCK:
  921                 case VFIFO:
  922                         if (vap->va_mtime.tv_sec == VNOVAL &&
  923                             vap->va_atime.tv_sec == VNOVAL &&
  924                             vap->va_mode == (mode_t)VNOVAL &&
  925                             vap->va_uid == (uid_t)VNOVAL &&
  926                             vap->va_gid == (gid_t)VNOVAL)
  927                                 return (0);             
  928                         vap->va_size = VNOVAL;
  929                         break;
  930                 default:
  931                         /*
  932                          * Disallow write attempts if the filesystem is
  933                          * mounted read-only.
  934                          */
  935                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  936                                 return (EROFS);
  937                         /*
  938                          *  We run vnode_pager_setsize() early (why?),
  939                          * we must set np->n_size now to avoid vinvalbuf
  940                          * V_SAVE races that might setsize a lower
  941                          * value.
  942                          */
  943                         mtx_lock(&np->n_mtx);
  944                         tsize = np->n_size;
  945                         mtx_unlock(&np->n_mtx);
  946                         error = ncl_meta_setsize(vp, ap->a_cred, td,
  947                             vap->va_size);
  948                         mtx_lock(&np->n_mtx);
  949                         if (np->n_flag & NMODIFIED) {
  950                             tsize = np->n_size;
  951                             mtx_unlock(&np->n_mtx);
  952                             if (vap->va_size == 0)
  953                                 error = ncl_vinvalbuf(vp, 0, td, 1);
  954                             else
  955                                 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
  956                             if (error) {
  957                                 vnode_pager_setsize(vp, tsize);
  958                                 return (error);
  959                             }
  960                             /*
  961                              * Call nfscl_delegmodtime() to set the modify time
  962                              * locally, as required.
  963                              */
  964                             nfscl_delegmodtime(vp);
  965                         } else
  966                             mtx_unlock(&np->n_mtx);
  967                         /*
  968                          * np->n_size has already been set to vap->va_size
  969                          * in ncl_meta_setsize(). We must set it again since
  970                          * nfs_loadattrcache() could be called through
  971                          * ncl_meta_setsize() and could modify np->n_size.
  972                          */
  973                         mtx_lock(&np->n_mtx);
  974                         np->n_vattr.na_size = np->n_size = vap->va_size;
  975                         mtx_unlock(&np->n_mtx);
  976                 };
  977         } else {
  978                 mtx_lock(&np->n_mtx);
  979                 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 
  980                     (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
  981                         mtx_unlock(&np->n_mtx);
  982                         if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
  983                             (error == EINTR || error == EIO))
  984                                 return (error);
  985                 } else
  986                         mtx_unlock(&np->n_mtx);
  987         }
  988         error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
  989         if (error && vap->va_size != VNOVAL) {
  990                 mtx_lock(&np->n_mtx);
  991                 np->n_size = np->n_vattr.na_size = tsize;
  992                 vnode_pager_setsize(vp, tsize);
  993                 mtx_unlock(&np->n_mtx);
  994         }
  995         return (error);
  996 }
  997 
  998 /*
  999  * Do an nfs setattr rpc.
 1000  */
 1001 static int
 1002 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
 1003     struct thread *td)
 1004 {
 1005         struct nfsnode *np = VTONFS(vp);
 1006         int error, ret, attrflag, i;
 1007         struct nfsvattr nfsva;
 1008 
 1009         if (NFS_ISV34(vp)) {
 1010                 mtx_lock(&np->n_mtx);
 1011                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
 1012                         np->n_accesscache[i].stamp = 0;
 1013                 np->n_flag |= NDELEGMOD;
 1014                 mtx_unlock(&np->n_mtx);
 1015                 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
 1016         }
 1017         error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
 1018             NULL);
 1019         if (attrflag) {
 1020                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1021                 if (ret && !error)
 1022                         error = ret;
 1023         }
 1024         if (error && NFS_ISV4(vp))
 1025                 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
 1026         return (error);
 1027 }
 1028 
 1029 /*
 1030  * nfs lookup call, one step at a time...
 1031  * First look in cache
 1032  * If not found, unlock the directory nfsnode and do the rpc
 1033  */
 1034 static int
 1035 nfs_lookup(struct vop_lookup_args *ap)
 1036 {
 1037         struct componentname *cnp = ap->a_cnp;
 1038         struct vnode *dvp = ap->a_dvp;
 1039         struct vnode **vpp = ap->a_vpp;
 1040         struct mount *mp = dvp->v_mount;
 1041         int flags = cnp->cn_flags;
 1042         struct vnode *newvp;
 1043         struct nfsmount *nmp;
 1044         struct nfsnode *np, *newnp;
 1045         int error = 0, attrflag, dattrflag, ltype, ncticks;
 1046         struct thread *td = cnp->cn_thread;
 1047         struct nfsfh *nfhp;
 1048         struct nfsvattr dnfsva, nfsva;
 1049         struct vattr vattr;
 1050         struct timespec nctime;
 1051         
 1052         *vpp = NULLVP;
 1053         if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
 1054             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
 1055                 return (EROFS);
 1056         if (dvp->v_type != VDIR)
 1057                 return (ENOTDIR);
 1058         nmp = VFSTONFS(mp);
 1059         np = VTONFS(dvp);
 1060 
 1061         /* For NFSv4, wait until any remove is done. */
 1062         mtx_lock(&np->n_mtx);
 1063         while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
 1064                 np->n_flag |= NREMOVEWANT;
 1065                 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
 1066         }
 1067         mtx_unlock(&np->n_mtx);
 1068 
 1069         if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
 1070                 return (error);
 1071         error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
 1072         if (error > 0 && error != ENOENT)
 1073                 return (error);
 1074         if (error == -1) {
 1075                 /*
 1076                  * Lookups of "." are special and always return the
 1077                  * current directory.  cache_lookup() already handles
 1078                  * associated locking bookkeeping, etc.
 1079                  */
 1080                 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
 1081                         /* XXX: Is this really correct? */
 1082                         if (cnp->cn_nameiop != LOOKUP &&
 1083                             (flags & ISLASTCN))
 1084                                 cnp->cn_flags |= SAVENAME;
 1085                         return (0);
 1086                 }
 1087 
 1088                 /*
 1089                  * We only accept a positive hit in the cache if the
 1090                  * change time of the file matches our cached copy.
 1091                  * Otherwise, we discard the cache entry and fallback
 1092                  * to doing a lookup RPC.  We also only trust cache
 1093                  * entries for less than nm_nametimeo seconds.
 1094                  *
 1095                  * To better handle stale file handles and attributes,
 1096                  * clear the attribute cache of this node if it is a
 1097                  * leaf component, part of an open() call, and not
 1098                  * locally modified before fetching the attributes.
 1099                  * This should allow stale file handles to be detected
 1100                  * here where we can fall back to a LOOKUP RPC to
 1101                  * recover rather than having nfs_open() detect the
 1102                  * stale file handle and failing open(2) with ESTALE.
 1103                  */
 1104                 newvp = *vpp;
 1105                 newnp = VTONFS(newvp);
 1106                 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
 1107                     (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1108                     !(newnp->n_flag & NMODIFIED)) {
 1109                         mtx_lock(&newnp->n_mtx);
 1110                         newnp->n_attrstamp = 0;
 1111                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1112                         mtx_unlock(&newnp->n_mtx);
 1113                 }
 1114                 if (nfscl_nodeleg(newvp, 0) == 0 ||
 1115                     ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
 1116                     VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
 1117                     timespeccmp(&vattr.va_ctime, &nctime, ==))) {
 1118                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1119                         if (cnp->cn_nameiop != LOOKUP &&
 1120                             (flags & ISLASTCN))
 1121                                 cnp->cn_flags |= SAVENAME;
 1122                         return (0);
 1123                 }
 1124                 cache_purge(newvp);
 1125                 if (dvp != newvp)
 1126                         vput(newvp);
 1127                 else 
 1128                         vrele(newvp);
 1129                 *vpp = NULLVP;
 1130         } else if (error == ENOENT) {
 1131                 if (dvp->v_iflag & VI_DOOMED)
 1132                         return (ENOENT);
 1133                 /*
 1134                  * We only accept a negative hit in the cache if the
 1135                  * modification time of the parent directory matches
 1136                  * the cached copy in the name cache entry.
 1137                  * Otherwise, we discard all of the negative cache
 1138                  * entries for this directory.  We also only trust
 1139                  * negative cache entries for up to nm_negnametimeo
 1140                  * seconds.
 1141                  */
 1142                 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
 1143                     VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
 1144                     timespeccmp(&vattr.va_mtime, &nctime, ==)) {
 1145                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1146                         return (ENOENT);
 1147                 }
 1148                 cache_purge_negative(dvp);
 1149         }
 1150 
 1151         error = 0;
 1152         newvp = NULLVP;
 1153         NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
 1154         error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1155             cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1156             NULL);
 1157         if (dattrflag)
 1158                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1159         if (error) {
 1160                 if (newvp != NULLVP) {
 1161                         vput(newvp);
 1162                         *vpp = NULLVP;
 1163                 }
 1164 
 1165                 if (error != ENOENT) {
 1166                         if (NFS_ISV4(dvp))
 1167                                 error = nfscl_maperr(td, error, (uid_t)0,
 1168                                     (gid_t)0);
 1169                         return (error);
 1170                 }
 1171 
 1172                 /* The requested file was not found. */
 1173                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 1174                     (flags & ISLASTCN)) {
 1175                         /*
 1176                          * XXX: UFS does a full VOP_ACCESS(dvp,
 1177                          * VWRITE) here instead of just checking
 1178                          * MNT_RDONLY.
 1179                          */
 1180                         if (mp->mnt_flag & MNT_RDONLY)
 1181                                 return (EROFS);
 1182                         cnp->cn_flags |= SAVENAME;
 1183                         return (EJUSTRETURN);
 1184                 }
 1185 
 1186                 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE &&
 1187                     dattrflag) {
 1188                         /*
 1189                          * Cache the modification time of the parent
 1190                          * directory from the post-op attributes in
 1191                          * the name cache entry.  The negative cache
 1192                          * entry will be ignored once the directory
 1193                          * has changed.  Don't bother adding the entry
 1194                          * if the directory has already changed.
 1195                          */
 1196                         mtx_lock(&np->n_mtx);
 1197                         if (timespeccmp(&np->n_vattr.na_mtime,
 1198                             &dnfsva.na_mtime, ==)) {
 1199                                 mtx_unlock(&np->n_mtx);
 1200                                 cache_enter_time(dvp, NULL, cnp,
 1201                                     &dnfsva.na_mtime, NULL);
 1202                         } else
 1203                                 mtx_unlock(&np->n_mtx);
 1204                 }
 1205                 return (ENOENT);
 1206         }
 1207 
 1208         /*
 1209          * Handle RENAME case...
 1210          */
 1211         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 1212                 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1213                         FREE((caddr_t)nfhp, M_NFSFH);
 1214                         return (EISDIR);
 1215                 }
 1216                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1217                     LK_EXCLUSIVE);
 1218                 if (error)
 1219                         return (error);
 1220                 newvp = NFSTOV(np);
 1221                 if (attrflag)
 1222                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1223                             0, 1);
 1224                 *vpp = newvp;
 1225                 cnp->cn_flags |= SAVENAME;
 1226                 return (0);
 1227         }
 1228 
 1229         if (flags & ISDOTDOT) {
 1230                 ltype = NFSVOPISLOCKED(dvp);
 1231                 error = vfs_busy(mp, MBF_NOWAIT);
 1232                 if (error != 0) {
 1233                         vfs_ref(mp);
 1234                         NFSVOPUNLOCK(dvp, 0);
 1235                         error = vfs_busy(mp, 0);
 1236                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1237                         vfs_rel(mp);
 1238                         if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
 1239                                 vfs_unbusy(mp);
 1240                                 error = ENOENT;
 1241                         }
 1242                         if (error != 0)
 1243                                 return (error);
 1244                 }
 1245                 NFSVOPUNLOCK(dvp, 0);
 1246                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1247                     cnp->cn_lkflags);
 1248                 if (error == 0)
 1249                         newvp = NFSTOV(np);
 1250                 vfs_unbusy(mp);
 1251                 if (newvp != dvp)
 1252                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1253                 if (dvp->v_iflag & VI_DOOMED) {
 1254                         if (error == 0) {
 1255                                 if (newvp == dvp)
 1256                                         vrele(newvp);
 1257                                 else
 1258                                         vput(newvp);
 1259                         }
 1260                         error = ENOENT;
 1261                 }
 1262                 if (error != 0)
 1263                         return (error);
 1264                 if (attrflag)
 1265                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1266                             0, 1);
 1267         } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1268                 FREE((caddr_t)nfhp, M_NFSFH);
 1269                 VREF(dvp);
 1270                 newvp = dvp;
 1271                 if (attrflag)
 1272                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1273                             0, 1);
 1274         } else {
 1275                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1276                     cnp->cn_lkflags);
 1277                 if (error)
 1278                         return (error);
 1279                 newvp = NFSTOV(np);
 1280                 if (attrflag)
 1281                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1282                             0, 1);
 1283                 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1284                     !(np->n_flag & NMODIFIED)) {                        
 1285                         /*
 1286                          * Flush the attribute cache when opening a
 1287                          * leaf node to ensure that fresh attributes
 1288                          * are fetched in nfs_open() since we did not
 1289                          * fetch attributes from the LOOKUP reply.
 1290                          */
 1291                         mtx_lock(&np->n_mtx);
 1292                         np->n_attrstamp = 0;
 1293                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1294                         mtx_unlock(&np->n_mtx);
 1295                 }
 1296         }
 1297         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1298                 cnp->cn_flags |= SAVENAME;
 1299         if ((cnp->cn_flags & MAKEENTRY) &&
 1300             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
 1301             attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
 1302                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1303                     newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
 1304         *vpp = newvp;
 1305         return (0);
 1306 }
 1307 
 1308 /*
 1309  * nfs read call.
 1310  * Just call ncl_bioread() to do the work.
 1311  */
 1312 static int
 1313 nfs_read(struct vop_read_args *ap)
 1314 {
 1315         struct vnode *vp = ap->a_vp;
 1316 
 1317         switch (vp->v_type) {
 1318         case VREG:
 1319                 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1320         case VDIR:
 1321                 return (EISDIR);
 1322         default:
 1323                 return (EOPNOTSUPP);
 1324         }
 1325 }
 1326 
 1327 /*
 1328  * nfs readlink call
 1329  */
 1330 static int
 1331 nfs_readlink(struct vop_readlink_args *ap)
 1332 {
 1333         struct vnode *vp = ap->a_vp;
 1334 
 1335         if (vp->v_type != VLNK)
 1336                 return (EINVAL);
 1337         return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1338 }
 1339 
 1340 /*
 1341  * Do a readlink rpc.
 1342  * Called by ncl_doio() from below the buffer cache.
 1343  */
 1344 int
 1345 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1346 {
 1347         int error, ret, attrflag;
 1348         struct nfsvattr nfsva;
 1349 
 1350         error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
 1351             &attrflag, NULL);
 1352         if (attrflag) {
 1353                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1354                 if (ret && !error)
 1355                         error = ret;
 1356         }
 1357         if (error && NFS_ISV4(vp))
 1358                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1359         return (error);
 1360 }
 1361 
 1362 /*
 1363  * nfs read rpc call
 1364  * Ditto above
 1365  */
 1366 int
 1367 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1368 {
 1369         int error, ret, attrflag;
 1370         struct nfsvattr nfsva;
 1371         struct nfsmount *nmp;
 1372 
 1373         nmp = VFSTONFS(vnode_mount(vp));
 1374         error = EIO;
 1375         attrflag = 0;
 1376         if (NFSHASPNFS(nmp))
 1377                 error = nfscl_doiods(vp, uiop, NULL, NULL,
 1378                     NFSV4OPEN_ACCESSREAD, cred, uiop->uio_td);
 1379         NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
 1380         if (error != 0)
 1381                 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
 1382                     &attrflag, NULL);
 1383         if (attrflag) {
 1384                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1385                 if (ret && !error)
 1386                         error = ret;
 1387         }
 1388         if (error && NFS_ISV4(vp))
 1389                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1390         return (error);
 1391 }
 1392 
 1393 /*
 1394  * nfs write call
 1395  */
 1396 int
 1397 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1398     int *iomode, int *must_commit, int called_from_strategy)
 1399 {
 1400         struct nfsvattr nfsva;
 1401         int error, attrflag, ret;
 1402         struct nfsmount *nmp;
 1403 
 1404         nmp = VFSTONFS(vnode_mount(vp));
 1405         error = EIO;
 1406         attrflag = 0;
 1407         if (NFSHASPNFS(nmp))
 1408                 error = nfscl_doiods(vp, uiop, iomode, must_commit,
 1409                     NFSV4OPEN_ACCESSWRITE, cred, uiop->uio_td);
 1410         NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
 1411         if (error != 0)
 1412                 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
 1413                     uiop->uio_td, &nfsva, &attrflag, NULL,
 1414                     called_from_strategy);
 1415         if (attrflag) {
 1416                 if (VTONFS(vp)->n_flag & ND_NFSV4)
 1417                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
 1418                             1);
 1419                 else
 1420                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 1421                             1);
 1422                 if (ret && !error)
 1423                         error = ret;
 1424         }
 1425         if (DOINGASYNC(vp))
 1426                 *iomode = NFSWRITE_FILESYNC;
 1427         if (error && NFS_ISV4(vp))
 1428                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1429         return (error);
 1430 }
 1431 
 1432 /*
 1433  * nfs mknod rpc
 1434  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1435  * mode set to specify the file type and the size field for rdev.
 1436  */
 1437 static int
 1438 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1439     struct vattr *vap)
 1440 {
 1441         struct nfsvattr nfsva, dnfsva;
 1442         struct vnode *newvp = NULL;
 1443         struct nfsnode *np = NULL, *dnp;
 1444         struct nfsfh *nfhp;
 1445         struct vattr vattr;
 1446         int error = 0, attrflag, dattrflag;
 1447         u_int32_t rdev;
 1448 
 1449         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1450                 rdev = vap->va_rdev;
 1451         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1452                 rdev = 0xffffffff;
 1453         else
 1454                 return (EOPNOTSUPP);
 1455         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1456                 return (error);
 1457         error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
 1458             rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 1459             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 1460         if (!error) {
 1461                 if (!nfhp)
 1462                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1463                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1464                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1465                             NULL);
 1466                 if (nfhp)
 1467                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1468                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1469         }
 1470         if (dattrflag)
 1471                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1472         if (!error) {
 1473                 newvp = NFSTOV(np);
 1474                 if (attrflag != 0) {
 1475                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1476                             0, 1);
 1477                         if (error != 0)
 1478                                 vput(newvp);
 1479                 }
 1480         }
 1481         if (!error) {
 1482                 *vpp = newvp;
 1483         } else if (NFS_ISV4(dvp)) {
 1484                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1485                     vap->va_gid);
 1486         }
 1487         dnp = VTONFS(dvp);
 1488         mtx_lock(&dnp->n_mtx);
 1489         dnp->n_flag |= NMODIFIED;
 1490         if (!dattrflag) {
 1491                 dnp->n_attrstamp = 0;
 1492                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1493         }
 1494         mtx_unlock(&dnp->n_mtx);
 1495         return (error);
 1496 }
 1497 
 1498 /*
 1499  * nfs mknod vop
 1500  * just call nfs_mknodrpc() to do the work.
 1501  */
 1502 /* ARGSUSED */
 1503 static int
 1504 nfs_mknod(struct vop_mknod_args *ap)
 1505 {
 1506         return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
 1507 }
 1508 
 1509 static struct mtx nfs_cverf_mtx;
 1510 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
 1511     MTX_DEF);
 1512 
 1513 static nfsquad_t
 1514 nfs_get_cverf(void)
 1515 {
 1516         static nfsquad_t cverf;
 1517         nfsquad_t ret;
 1518         static int cverf_initialized = 0;
 1519 
 1520         mtx_lock(&nfs_cverf_mtx);
 1521         if (cverf_initialized == 0) {
 1522                 cverf.lval[0] = arc4random();
 1523                 cverf.lval[1] = arc4random();
 1524                 cverf_initialized = 1;
 1525         } else
 1526                 cverf.qval++;
 1527         ret = cverf;
 1528         mtx_unlock(&nfs_cverf_mtx);
 1529 
 1530         return (ret);
 1531 }
 1532 
 1533 /*
 1534  * nfs file create call
 1535  */
 1536 static int
 1537 nfs_create(struct vop_create_args *ap)
 1538 {
 1539         struct vnode *dvp = ap->a_dvp;
 1540         struct vattr *vap = ap->a_vap;
 1541         struct componentname *cnp = ap->a_cnp;
 1542         struct nfsnode *np = NULL, *dnp;
 1543         struct vnode *newvp = NULL;
 1544         struct nfsmount *nmp;
 1545         struct nfsvattr dnfsva, nfsva;
 1546         struct nfsfh *nfhp;
 1547         nfsquad_t cverf;
 1548         int error = 0, attrflag, dattrflag, fmode = 0;
 1549         struct vattr vattr;
 1550 
 1551         /*
 1552          * Oops, not for me..
 1553          */
 1554         if (vap->va_type == VSOCK)
 1555                 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 1556 
 1557         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1558                 return (error);
 1559         if (vap->va_vaflags & VA_EXCLUSIVE)
 1560                 fmode |= O_EXCL;
 1561         dnp = VTONFS(dvp);
 1562         nmp = VFSTONFS(vnode_mount(dvp));
 1563 again:
 1564         /* For NFSv4, wait until any remove is done. */
 1565         mtx_lock(&dnp->n_mtx);
 1566         while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
 1567                 dnp->n_flag |= NREMOVEWANT;
 1568                 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
 1569         }
 1570         mtx_unlock(&dnp->n_mtx);
 1571 
 1572         cverf = nfs_get_cverf();
 1573         error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1574             vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
 1575             &nfhp, &attrflag, &dattrflag, NULL);
 1576         if (!error) {
 1577                 if (nfhp == NULL)
 1578                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1579                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1580                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1581                             NULL);
 1582                 if (nfhp != NULL)
 1583                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1584                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1585         }
 1586         if (dattrflag)
 1587                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1588         if (!error) {
 1589                 newvp = NFSTOV(np);
 1590                 if (attrflag == 0)
 1591                         error = nfsrpc_getattr(newvp, cnp->cn_cred,
 1592                             cnp->cn_thread, &nfsva, NULL);
 1593                 if (error == 0)
 1594                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1595                             0, 1);
 1596         }
 1597         if (error) {
 1598                 if (newvp != NULL) {
 1599                         vput(newvp);
 1600                         newvp = NULL;
 1601                 }
 1602                 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
 1603                     error == NFSERR_NOTSUPP) {
 1604                         fmode &= ~O_EXCL;
 1605                         goto again;
 1606                 }
 1607         } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
 1608                 if (nfscl_checksattr(vap, &nfsva)) {
 1609                         /*
 1610                          * We are normally called with only a partially
 1611                          * initialized VAP. Since the NFSv3 spec says that
 1612                          * the server may use the file attributes to
 1613                          * store the verifier, the spec requires us to do a
 1614                          * SETATTR RPC. FreeBSD servers store the verifier in
 1615                          * atime, but we can't really assume that all servers
 1616                          * will so we ensure that our SETATTR sets both atime
 1617                          * and mtime.
 1618                          */
 1619                         if (vap->va_mtime.tv_sec == VNOVAL)
 1620                                 vfs_timestamp(&vap->va_mtime);
 1621                         if (vap->va_atime.tv_sec == VNOVAL)
 1622                                 vap->va_atime = vap->va_mtime;
 1623                         error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
 1624                             cnp->cn_thread, &nfsva, &attrflag, NULL);
 1625                         if (error && (vap->va_uid != (uid_t)VNOVAL ||
 1626                             vap->va_gid != (gid_t)VNOVAL)) {
 1627                                 /* try again without setting uid/gid */
 1628                                 vap->va_uid = (uid_t)VNOVAL;
 1629                                 vap->va_gid = (uid_t)VNOVAL;
 1630                                 error = nfsrpc_setattr(newvp, vap, NULL, 
 1631                                     cnp->cn_cred, cnp->cn_thread, &nfsva,
 1632                                     &attrflag, NULL);
 1633                         }
 1634                         if (attrflag)
 1635                                 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 1636                                     NULL, 0, 1);
 1637                         if (error != 0)
 1638                                 vput(newvp);
 1639                 }
 1640         }
 1641         if (!error) {
 1642                 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
 1643                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1644                             NULL);
 1645                 *ap->a_vpp = newvp;
 1646         } else if (NFS_ISV4(dvp)) {
 1647                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1648                     vap->va_gid);
 1649         }
 1650         mtx_lock(&dnp->n_mtx);
 1651         dnp->n_flag |= NMODIFIED;
 1652         if (!dattrflag) {
 1653                 dnp->n_attrstamp = 0;
 1654                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1655         }
 1656         mtx_unlock(&dnp->n_mtx);
 1657         return (error);
 1658 }
 1659 
 1660 /*
 1661  * nfs file remove call
 1662  * To try and make nfs semantics closer to ufs semantics, a file that has
 1663  * other processes using the vnode is renamed instead of removed and then
 1664  * removed later on the last close.
 1665  * - If v_usecount > 1
 1666  *        If a rename is not already in the works
 1667  *           call nfs_sillyrename() to set it up
 1668  *     else
 1669  *        do the remove rpc
 1670  */
 1671 static int
 1672 nfs_remove(struct vop_remove_args *ap)
 1673 {
 1674         struct vnode *vp = ap->a_vp;
 1675         struct vnode *dvp = ap->a_dvp;
 1676         struct componentname *cnp = ap->a_cnp;
 1677         struct nfsnode *np = VTONFS(vp);
 1678         int error = 0;
 1679         struct vattr vattr;
 1680 
 1681         KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
 1682         KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
 1683         if (vp->v_type == VDIR)
 1684                 error = EPERM;
 1685         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1686             VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
 1687             vattr.va_nlink > 1)) {
 1688                 /*
 1689                  * Purge the name cache so that the chance of a lookup for
 1690                  * the name succeeding while the remove is in progress is
 1691                  * minimized. Without node locking it can still happen, such
 1692                  * that an I/O op returns ESTALE, but since you get this if
 1693                  * another host removes the file..
 1694                  */
 1695                 cache_purge(vp);
 1696                 /*
 1697                  * throw away biocache buffers, mainly to avoid
 1698                  * unnecessary delayed writes later.
 1699                  */
 1700                 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1701                 /* Do the rpc */
 1702                 if (error != EINTR && error != EIO)
 1703                         error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
 1704                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1705                 /*
 1706                  * Kludge City: If the first reply to the remove rpc is lost..
 1707                  *   the reply to the retransmitted request will be ENOENT
 1708                  *   since the file was in fact removed
 1709                  *   Therefore, we cheat and return success.
 1710                  */
 1711                 if (error == ENOENT)
 1712                         error = 0;
 1713         } else if (!np->n_sillyrename)
 1714                 error = nfs_sillyrename(dvp, vp, cnp);
 1715         mtx_lock(&np->n_mtx);
 1716         np->n_attrstamp = 0;
 1717         mtx_unlock(&np->n_mtx);
 1718         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1719         return (error);
 1720 }
 1721 
 1722 /*
 1723  * nfs file remove rpc called from nfs_inactive
 1724  */
 1725 int
 1726 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
 1727 {
 1728         /*
 1729          * Make sure that the directory vnode is still valid.
 1730          * XXX we should lock sp->s_dvp here.
 1731          */
 1732         if (sp->s_dvp->v_type == VBAD)
 1733                 return (0);
 1734         return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
 1735             sp->s_cred, NULL));
 1736 }
 1737 
 1738 /*
 1739  * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
 1740  */
 1741 static int
 1742 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
 1743     int namelen, struct ucred *cred, struct thread *td)
 1744 {
 1745         struct nfsvattr dnfsva;
 1746         struct nfsnode *dnp = VTONFS(dvp);
 1747         int error = 0, dattrflag;
 1748 
 1749         mtx_lock(&dnp->n_mtx);
 1750         dnp->n_flag |= NREMOVEINPROG;
 1751         mtx_unlock(&dnp->n_mtx);
 1752         error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
 1753             &dattrflag, NULL);
 1754         mtx_lock(&dnp->n_mtx);
 1755         if ((dnp->n_flag & NREMOVEWANT)) {
 1756                 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
 1757                 mtx_unlock(&dnp->n_mtx);
 1758                 wakeup((caddr_t)dnp);
 1759         } else {
 1760                 dnp->n_flag &= ~NREMOVEINPROG;
 1761                 mtx_unlock(&dnp->n_mtx);
 1762         }
 1763         if (dattrflag)
 1764                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1765         mtx_lock(&dnp->n_mtx);
 1766         dnp->n_flag |= NMODIFIED;
 1767         if (!dattrflag) {
 1768                 dnp->n_attrstamp = 0;
 1769                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1770         }
 1771         mtx_unlock(&dnp->n_mtx);
 1772         if (error && NFS_ISV4(dvp))
 1773                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1774         return (error);
 1775 }
 1776 
 1777 /*
 1778  * nfs file rename call
 1779  */
 1780 static int
 1781 nfs_rename(struct vop_rename_args *ap)
 1782 {
 1783         struct vnode *fvp = ap->a_fvp;
 1784         struct vnode *tvp = ap->a_tvp;
 1785         struct vnode *fdvp = ap->a_fdvp;
 1786         struct vnode *tdvp = ap->a_tdvp;
 1787         struct componentname *tcnp = ap->a_tcnp;
 1788         struct componentname *fcnp = ap->a_fcnp;
 1789         struct nfsnode *fnp = VTONFS(ap->a_fvp);
 1790         struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
 1791         struct nfsv4node *newv4 = NULL;
 1792         int error;
 1793 
 1794         KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
 1795             (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
 1796         /* Check for cross-device rename */
 1797         if ((fvp->v_mount != tdvp->v_mount) ||
 1798             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1799                 error = EXDEV;
 1800                 goto out;
 1801         }
 1802 
 1803         if (fvp == tvp) {
 1804                 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n");
 1805                 error = 0;
 1806                 goto out;
 1807         }
 1808         if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
 1809                 goto out;
 1810 
 1811         /*
 1812          * We have to flush B_DELWRI data prior to renaming
 1813          * the file.  If we don't, the delayed-write buffers
 1814          * can be flushed out later after the file has gone stale
 1815          * under NFSV3.  NFSV2 does not have this problem because
 1816          * ( as far as I can tell ) it flushes dirty buffers more
 1817          * often.
 1818          * 
 1819          * Skip the rename operation if the fsync fails, this can happen
 1820          * due to the server's volume being full, when we pushed out data
 1821          * that was written back to our cache earlier. Not checking for
 1822          * this condition can result in potential (silent) data loss.
 1823          */
 1824         error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1825         NFSVOPUNLOCK(fvp, 0);
 1826         if (!error && tvp)
 1827                 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1828         if (error)
 1829                 goto out;
 1830 
 1831         /*
 1832          * If the tvp exists and is in use, sillyrename it before doing the
 1833          * rename of the new file over it.
 1834          * XXX Can't sillyrename a directory.
 1835          */
 1836         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1837                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1838                 vput(tvp);
 1839                 tvp = NULL;
 1840         }
 1841 
 1842         error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1843             tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1844             tcnp->cn_thread);
 1845 
 1846         if (error == 0 && NFS_ISV4(tdvp)) {
 1847                 /*
 1848                  * For NFSv4, check to see if it is the same name and
 1849                  * replace the name, if it is different.
 1850                  */
 1851                 MALLOC(newv4, struct nfsv4node *,
 1852                     sizeof (struct nfsv4node) +
 1853                     tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
 1854                     M_NFSV4NODE, M_WAITOK);
 1855                 mtx_lock(&tdnp->n_mtx);
 1856                 mtx_lock(&fnp->n_mtx);
 1857                 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
 1858                     (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
 1859                       NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
 1860                       tcnp->cn_namelen) ||
 1861                       tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
 1862                       NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1863                         tdnp->n_fhp->nfh_len))) {
 1864 #ifdef notdef
 1865 { char nnn[100]; int nnnl;
 1866 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
 1867 bcopy(tcnp->cn_nameptr, nnn, nnnl);
 1868 nnn[nnnl] = '\0';
 1869 printf("ren replace=%s\n",nnn);
 1870 }
 1871 #endif
 1872                         FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
 1873                         fnp->n_v4 = newv4;
 1874                         newv4 = NULL;
 1875                         fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
 1876                         fnp->n_v4->n4_namelen = tcnp->cn_namelen;
 1877                         NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1878                             tdnp->n_fhp->nfh_len);
 1879                         NFSBCOPY(tcnp->cn_nameptr,
 1880                             NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
 1881                 }
 1882                 mtx_unlock(&tdnp->n_mtx);
 1883                 mtx_unlock(&fnp->n_mtx);
 1884                 if (newv4 != NULL)
 1885                         FREE((caddr_t)newv4, M_NFSV4NODE);
 1886         }
 1887 
 1888         if (fvp->v_type == VDIR) {
 1889                 if (tvp != NULL && tvp->v_type == VDIR)
 1890                         cache_purge(tdvp);
 1891                 cache_purge(fdvp);
 1892         }
 1893 
 1894 out:
 1895         if (tdvp == tvp)
 1896                 vrele(tdvp);
 1897         else
 1898                 vput(tdvp);
 1899         if (tvp)
 1900                 vput(tvp);
 1901         vrele(fdvp);
 1902         vrele(fvp);
 1903         /*
 1904          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1905          */
 1906         if (error == ENOENT)
 1907                 error = 0;
 1908         return (error);
 1909 }
 1910 
 1911 /*
 1912  * nfs file rename rpc called from nfs_remove() above
 1913  */
 1914 static int
 1915 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
 1916     struct sillyrename *sp)
 1917 {
 1918 
 1919         return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
 1920             sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
 1921             scnp->cn_thread));
 1922 }
 1923 
 1924 /*
 1925  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 1926  */
 1927 static int
 1928 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
 1929     int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
 1930     int tnamelen, struct ucred *cred, struct thread *td)
 1931 {
 1932         struct nfsvattr fnfsva, tnfsva;
 1933         struct nfsnode *fdnp = VTONFS(fdvp);
 1934         struct nfsnode *tdnp = VTONFS(tdvp);
 1935         int error = 0, fattrflag, tattrflag;
 1936 
 1937         error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
 1938             tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
 1939             &tattrflag, NULL, NULL);
 1940         mtx_lock(&fdnp->n_mtx);
 1941         fdnp->n_flag |= NMODIFIED;
 1942         if (fattrflag != 0) {
 1943                 mtx_unlock(&fdnp->n_mtx);
 1944                 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
 1945         } else {
 1946                 fdnp->n_attrstamp = 0;
 1947                 mtx_unlock(&fdnp->n_mtx);
 1948                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
 1949         }
 1950         mtx_lock(&tdnp->n_mtx);
 1951         tdnp->n_flag |= NMODIFIED;
 1952         if (tattrflag != 0) {
 1953                 mtx_unlock(&tdnp->n_mtx);
 1954                 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
 1955         } else {
 1956                 tdnp->n_attrstamp = 0;
 1957                 mtx_unlock(&tdnp->n_mtx);
 1958                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 1959         }
 1960         if (error && NFS_ISV4(fdvp))
 1961                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1962         return (error);
 1963 }
 1964 
 1965 /*
 1966  * nfs hard link create call
 1967  */
 1968 static int
 1969 nfs_link(struct vop_link_args *ap)
 1970 {
 1971         struct vnode *vp = ap->a_vp;
 1972         struct vnode *tdvp = ap->a_tdvp;
 1973         struct componentname *cnp = ap->a_cnp;
 1974         struct nfsnode *np, *tdnp;
 1975         struct nfsvattr nfsva, dnfsva;
 1976         int error = 0, attrflag, dattrflag;
 1977 
 1978         if (vp->v_mount != tdvp->v_mount) {
 1979                 return (EXDEV);
 1980         }
 1981 
 1982         /*
 1983          * Push all writes to the server, so that the attribute cache
 1984          * doesn't get "out of sync" with the server.
 1985          * XXX There should be a better way!
 1986          */
 1987         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 1988 
 1989         error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
 1990             cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
 1991             &dattrflag, NULL);
 1992         tdnp = VTONFS(tdvp);
 1993         mtx_lock(&tdnp->n_mtx);
 1994         tdnp->n_flag |= NMODIFIED;
 1995         if (dattrflag != 0) {
 1996                 mtx_unlock(&tdnp->n_mtx);
 1997                 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
 1998         } else {
 1999                 tdnp->n_attrstamp = 0;
 2000                 mtx_unlock(&tdnp->n_mtx);
 2001                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 2002         }
 2003         if (attrflag)
 2004                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2005         else {
 2006                 np = VTONFS(vp);
 2007                 mtx_lock(&np->n_mtx);
 2008                 np->n_attrstamp = 0;
 2009                 mtx_unlock(&np->n_mtx);
 2010                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 2011         }
 2012         /*
 2013          * If negative lookup caching is enabled, I might as well
 2014          * add an entry for this node. Not necessary for correctness,
 2015          * but if negative caching is enabled, then the system
 2016          * must care about lookup caching hit rate, so...
 2017          */
 2018         if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
 2019             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 2020                 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
 2021         }
 2022         if (error && NFS_ISV4(vp))
 2023                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2024                     (gid_t)0);
 2025         return (error);
 2026 }
 2027 
 2028 /*
 2029  * nfs symbolic link create call
 2030  */
 2031 static int
 2032 nfs_symlink(struct vop_symlink_args *ap)
 2033 {
 2034         struct vnode *dvp = ap->a_dvp;
 2035         struct vattr *vap = ap->a_vap;
 2036         struct componentname *cnp = ap->a_cnp;
 2037         struct nfsvattr nfsva, dnfsva;
 2038         struct nfsfh *nfhp;
 2039         struct nfsnode *np = NULL, *dnp;
 2040         struct vnode *newvp = NULL;
 2041         int error = 0, attrflag, dattrflag, ret;
 2042 
 2043         vap->va_type = VLNK;
 2044         error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2045             ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 2046             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 2047         if (nfhp) {
 2048                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2049                     &np, NULL, LK_EXCLUSIVE);
 2050                 if (!ret)
 2051                         newvp = NFSTOV(np);
 2052                 else if (!error)
 2053                         error = ret;
 2054         }
 2055         if (newvp != NULL) {
 2056                 if (attrflag)
 2057                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2058                             0, 1);
 2059         } else if (!error) {
 2060                 /*
 2061                  * If we do not have an error and we could not extract the
 2062                  * newvp from the response due to the request being NFSv2, we
 2063                  * have to do a lookup in order to obtain a newvp to return.
 2064                  */
 2065                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2066                     cnp->cn_cred, cnp->cn_thread, &np);
 2067                 if (!error)
 2068                         newvp = NFSTOV(np);
 2069         }
 2070         if (error) {
 2071                 if (newvp)
 2072                         vput(newvp);
 2073                 if (NFS_ISV4(dvp))
 2074                         error = nfscl_maperr(cnp->cn_thread, error,
 2075                             vap->va_uid, vap->va_gid);
 2076         } else {
 2077                 *ap->a_vpp = newvp;
 2078         }
 2079 
 2080         dnp = VTONFS(dvp);
 2081         mtx_lock(&dnp->n_mtx);
 2082         dnp->n_flag |= NMODIFIED;
 2083         if (dattrflag != 0) {
 2084                 mtx_unlock(&dnp->n_mtx);
 2085                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2086         } else {
 2087                 dnp->n_attrstamp = 0;
 2088                 mtx_unlock(&dnp->n_mtx);
 2089                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2090         }
 2091         /*
 2092          * If negative lookup caching is enabled, I might as well
 2093          * add an entry for this node. Not necessary for correctness,
 2094          * but if negative caching is enabled, then the system
 2095          * must care about lookup caching hit rate, so...
 2096          */
 2097         if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2098             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 2099                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
 2100         }
 2101         return (error);
 2102 }
 2103 
 2104 /*
 2105  * nfs make dir call
 2106  */
 2107 static int
 2108 nfs_mkdir(struct vop_mkdir_args *ap)
 2109 {
 2110         struct vnode *dvp = ap->a_dvp;
 2111         struct vattr *vap = ap->a_vap;
 2112         struct componentname *cnp = ap->a_cnp;
 2113         struct nfsnode *np = NULL, *dnp;
 2114         struct vnode *newvp = NULL;
 2115         struct vattr vattr;
 2116         struct nfsfh *nfhp;
 2117         struct nfsvattr nfsva, dnfsva;
 2118         int error = 0, attrflag, dattrflag, ret;
 2119 
 2120         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
 2121                 return (error);
 2122         vap->va_type = VDIR;
 2123         error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2124             vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
 2125             &attrflag, &dattrflag, NULL);
 2126         dnp = VTONFS(dvp);
 2127         mtx_lock(&dnp->n_mtx);
 2128         dnp->n_flag |= NMODIFIED;
 2129         if (dattrflag != 0) {
 2130                 mtx_unlock(&dnp->n_mtx);
 2131                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2132         } else {
 2133                 dnp->n_attrstamp = 0;
 2134                 mtx_unlock(&dnp->n_mtx);
 2135                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2136         }
 2137         if (nfhp) {
 2138                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2139                     &np, NULL, LK_EXCLUSIVE);
 2140                 if (!ret) {
 2141                         newvp = NFSTOV(np);
 2142                         if (attrflag)
 2143                            (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 2144                                 NULL, 0, 1);
 2145                 } else if (!error)
 2146                         error = ret;
 2147         }
 2148         if (!error && newvp == NULL) {
 2149                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2150                     cnp->cn_cred, cnp->cn_thread, &np);
 2151                 if (!error) {
 2152                         newvp = NFSTOV(np);
 2153                         if (newvp->v_type != VDIR)
 2154                                 error = EEXIST;
 2155                 }
 2156         }
 2157         if (error) {
 2158                 if (newvp)
 2159                         vput(newvp);
 2160                 if (NFS_ISV4(dvp))
 2161                         error = nfscl_maperr(cnp->cn_thread, error,
 2162                             vap->va_uid, vap->va_gid);
 2163         } else {
 2164                 /*
 2165                  * If negative lookup caching is enabled, I might as well
 2166                  * add an entry for this node. Not necessary for correctness,
 2167                  * but if negative caching is enabled, then the system
 2168                  * must care about lookup caching hit rate, so...
 2169                  */
 2170                 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2171                     (cnp->cn_flags & MAKEENTRY) &&
 2172                     attrflag != 0 && dattrflag != 0)
 2173                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 2174                             &dnfsva.na_ctime);
 2175                 *ap->a_vpp = newvp;
 2176         }
 2177         return (error);
 2178 }
 2179 
 2180 /*
 2181  * nfs remove directory call
 2182  */
 2183 static int
 2184 nfs_rmdir(struct vop_rmdir_args *ap)
 2185 {
 2186         struct vnode *vp = ap->a_vp;
 2187         struct vnode *dvp = ap->a_dvp;
 2188         struct componentname *cnp = ap->a_cnp;
 2189         struct nfsnode *dnp;
 2190         struct nfsvattr dnfsva;
 2191         int error, dattrflag;
 2192 
 2193         if (dvp == vp)
 2194                 return (EINVAL);
 2195         error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2196             cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
 2197         dnp = VTONFS(dvp);
 2198         mtx_lock(&dnp->n_mtx);
 2199         dnp->n_flag |= NMODIFIED;
 2200         if (dattrflag != 0) {
 2201                 mtx_unlock(&dnp->n_mtx);
 2202                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2203         } else {
 2204                 dnp->n_attrstamp = 0;
 2205                 mtx_unlock(&dnp->n_mtx);
 2206                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2207         }
 2208 
 2209         cache_purge(dvp);
 2210         cache_purge(vp);
 2211         if (error && NFS_ISV4(dvp))
 2212                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2213                     (gid_t)0);
 2214         /*
 2215          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 2216          */
 2217         if (error == ENOENT)
 2218                 error = 0;
 2219         return (error);
 2220 }
 2221 
 2222 /*
 2223  * nfs readdir call
 2224  */
 2225 static int
 2226 nfs_readdir(struct vop_readdir_args *ap)
 2227 {
 2228         struct vnode *vp = ap->a_vp;
 2229         struct nfsnode *np = VTONFS(vp);
 2230         struct uio *uio = ap->a_uio;
 2231         ssize_t tresid;
 2232         int error = 0;
 2233         struct vattr vattr;
 2234         
 2235         if (ap->a_eofflag != NULL)
 2236                 *ap->a_eofflag = 0;
 2237         if (vp->v_type != VDIR) 
 2238                 return(EPERM);
 2239 
 2240         /*
 2241          * First, check for hit on the EOF offset cache
 2242          */
 2243         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 2244             (np->n_flag & NMODIFIED) == 0) {
 2245                 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
 2246                         mtx_lock(&np->n_mtx);
 2247                         if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
 2248                             !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 2249                                 mtx_unlock(&np->n_mtx);
 2250                                 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
 2251                                 if (ap->a_eofflag != NULL)
 2252                                         *ap->a_eofflag = 1;
 2253                                 return (0);
 2254                         } else
 2255                                 mtx_unlock(&np->n_mtx);
 2256                 }
 2257         }
 2258 
 2259         /*
 2260          * Call ncl_bioread() to do the real work.
 2261          */
 2262         tresid = uio->uio_resid;
 2263         error = ncl_bioread(vp, uio, 0, ap->a_cred);
 2264 
 2265         if (!error && uio->uio_resid == tresid) {
 2266                 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
 2267                 if (ap->a_eofflag != NULL)
 2268                         *ap->a_eofflag = 1;
 2269         }
 2270         return (error);
 2271 }
 2272 
 2273 /*
 2274  * Readdir rpc call.
 2275  * Called from below the buffer cache by ncl_doio().
 2276  */
 2277 int
 2278 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2279     struct thread *td)
 2280 {
 2281         struct nfsvattr nfsva;
 2282         nfsuint64 *cookiep, cookie;
 2283         struct nfsnode *dnp = VTONFS(vp);
 2284         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2285         int error = 0, eof, attrflag;
 2286 
 2287         KASSERT(uiop->uio_iovcnt == 1 &&
 2288             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2289             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2290             ("nfs readdirrpc bad uio"));
 2291 
 2292         /*
 2293          * If there is no cookie, assume directory was stale.
 2294          */
 2295         ncl_dircookie_lock(dnp);
 2296         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2297         if (cookiep) {
 2298                 cookie = *cookiep;
 2299                 ncl_dircookie_unlock(dnp);
 2300         } else {
 2301                 ncl_dircookie_unlock(dnp);              
 2302                 return (NFSERR_BAD_COOKIE);
 2303         }
 2304 
 2305         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2306                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2307 
 2308         error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
 2309             &attrflag, &eof, NULL);
 2310         if (attrflag)
 2311                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2312 
 2313         if (!error) {
 2314                 /*
 2315                  * We are now either at the end of the directory or have filled
 2316                  * the block.
 2317                  */
 2318                 if (eof)
 2319                         dnp->n_direofoffset = uiop->uio_offset;
 2320                 else {
 2321                         if (uiop->uio_resid > 0)
 2322                                 ncl_printf("EEK! readdirrpc resid > 0\n");
 2323                         ncl_dircookie_lock(dnp);
 2324                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2325                         *cookiep = cookie;
 2326                         ncl_dircookie_unlock(dnp);
 2327                 }
 2328         } else if (NFS_ISV4(vp)) {
 2329                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2330         }
 2331         return (error);
 2332 }
 2333 
 2334 /*
 2335  * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
 2336  */
 2337 int
 2338 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2339     struct thread *td)
 2340 {
 2341         struct nfsvattr nfsva;
 2342         nfsuint64 *cookiep, cookie;
 2343         struct nfsnode *dnp = VTONFS(vp);
 2344         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2345         int error = 0, attrflag, eof;
 2346 
 2347         KASSERT(uiop->uio_iovcnt == 1 &&
 2348             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2349             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2350             ("nfs readdirplusrpc bad uio"));
 2351 
 2352         /*
 2353          * If there is no cookie, assume directory was stale.
 2354          */
 2355         ncl_dircookie_lock(dnp);
 2356         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2357         if (cookiep) {
 2358                 cookie = *cookiep;
 2359                 ncl_dircookie_unlock(dnp);
 2360         } else {
 2361                 ncl_dircookie_unlock(dnp);
 2362                 return (NFSERR_BAD_COOKIE);
 2363         }
 2364 
 2365         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2366                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2367         error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
 2368             &attrflag, &eof, NULL);
 2369         if (attrflag)
 2370                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2371 
 2372         if (!error) {
 2373                 /*
 2374                  * We are now either at end of the directory or have filled the
 2375                  * the block.
 2376                  */
 2377                 if (eof)
 2378                         dnp->n_direofoffset = uiop->uio_offset;
 2379                 else {
 2380                         if (uiop->uio_resid > 0)
 2381                                 ncl_printf("EEK! readdirplusrpc resid > 0\n");
 2382                         ncl_dircookie_lock(dnp);
 2383                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2384                         *cookiep = cookie;
 2385                         ncl_dircookie_unlock(dnp);
 2386                 }
 2387         } else if (NFS_ISV4(vp)) {
 2388                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2389         }
 2390         return (error);
 2391 }
 2392 
 2393 /*
 2394  * Silly rename. To make the NFS filesystem that is stateless look a little
 2395  * more like the "ufs" a remove of an active vnode is translated to a rename
 2396  * to a funny looking filename that is removed by nfs_inactive on the
 2397  * nfsnode. There is the potential for another process on a different client
 2398  * to create the same funny name between the nfs_lookitup() fails and the
 2399  * nfs_rename() completes, but...
 2400  */
 2401 static int
 2402 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2403 {
 2404         struct sillyrename *sp;
 2405         struct nfsnode *np;
 2406         int error;
 2407         short pid;
 2408         unsigned int lticks;
 2409 
 2410         cache_purge(dvp);
 2411         np = VTONFS(vp);
 2412         KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
 2413         MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
 2414             M_NEWNFSREQ, M_WAITOK);
 2415         sp->s_cred = crhold(cnp->cn_cred);
 2416         sp->s_dvp = dvp;
 2417         VREF(dvp);
 2418 
 2419         /* 
 2420          * Fudge together a funny name.
 2421          * Changing the format of the funny name to accomodate more 
 2422          * sillynames per directory.
 2423          * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 
 2424          * CPU ticks since boot.
 2425          */
 2426         pid = cnp->cn_thread->td_proc->p_pid;
 2427         lticks = (unsigned int)ticks;
 2428         for ( ; ; ) {
 2429                 sp->s_namlen = sprintf(sp->s_name, 
 2430                                        ".nfs.%08x.%04x4.4", lticks, 
 2431                                        pid);
 2432                 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2433                                  cnp->cn_thread, NULL))
 2434                         break;
 2435                 lticks++;
 2436         }
 2437         error = nfs_renameit(dvp, vp, cnp, sp);
 2438         if (error)
 2439                 goto bad;
 2440         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2441                 cnp->cn_thread, &np);
 2442         np->n_sillyrename = sp;
 2443         return (0);
 2444 bad:
 2445         vrele(sp->s_dvp);
 2446         crfree(sp->s_cred);
 2447         free((caddr_t)sp, M_NEWNFSREQ);
 2448         return (error);
 2449 }
 2450 
 2451 /*
 2452  * Look up a file name and optionally either update the file handle or
 2453  * allocate an nfsnode, depending on the value of npp.
 2454  * npp == NULL  --> just do the lookup
 2455  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2456  *                      handled too
 2457  * *npp != NULL --> update the file handle in the vnode
 2458  */
 2459 static int
 2460 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
 2461     struct thread *td, struct nfsnode **npp)
 2462 {
 2463         struct vnode *newvp = NULL, *vp;
 2464         struct nfsnode *np, *dnp = VTONFS(dvp);
 2465         struct nfsfh *nfhp, *onfhp;
 2466         struct nfsvattr nfsva, dnfsva;
 2467         struct componentname cn;
 2468         int error = 0, attrflag, dattrflag;
 2469         u_int hash;
 2470 
 2471         error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
 2472             &nfhp, &attrflag, &dattrflag, NULL);
 2473         if (dattrflag)
 2474                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2475         if (npp && !error) {
 2476                 if (*npp != NULL) {
 2477                     np = *npp;
 2478                     vp = NFSTOV(np);
 2479                     /*
 2480                      * For NFSv4, check to see if it is the same name and
 2481                      * replace the name, if it is different.
 2482                      */
 2483                     if (np->n_v4 != NULL && nfsva.na_type == VREG &&
 2484                         (np->n_v4->n4_namelen != len ||
 2485                          NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
 2486                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
 2487                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2488                          dnp->n_fhp->nfh_len))) {
 2489 #ifdef notdef
 2490 { char nnn[100]; int nnnl;
 2491 nnnl = (len < 100) ? len : 99;
 2492 bcopy(name, nnn, nnnl);
 2493 nnn[nnnl] = '\0';
 2494 printf("replace=%s\n",nnn);
 2495 }
 2496 #endif
 2497                             FREE((caddr_t)np->n_v4, M_NFSV4NODE);
 2498                             MALLOC(np->n_v4, struct nfsv4node *,
 2499                                 sizeof (struct nfsv4node) +
 2500                                 dnp->n_fhp->nfh_len + len - 1,
 2501                                 M_NFSV4NODE, M_WAITOK);
 2502                             np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
 2503                             np->n_v4->n4_namelen = len;
 2504                             NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2505                                 dnp->n_fhp->nfh_len);
 2506                             NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
 2507                     }
 2508                     hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
 2509                         FNV1_32_INIT);
 2510                     onfhp = np->n_fhp;
 2511                     /*
 2512                      * Rehash node for new file handle.
 2513                      */
 2514                     vfs_hash_rehash(vp, hash);
 2515                     np->n_fhp = nfhp;
 2516                     if (onfhp != NULL)
 2517                         FREE((caddr_t)onfhp, M_NFSFH);
 2518                     newvp = NFSTOV(np);
 2519                 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
 2520                     FREE((caddr_t)nfhp, M_NFSFH);
 2521                     VREF(dvp);
 2522                     newvp = dvp;
 2523                 } else {
 2524                     cn.cn_nameptr = name;
 2525                     cn.cn_namelen = len;
 2526                     error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
 2527                         &np, NULL, LK_EXCLUSIVE);
 2528                     if (error)
 2529                         return (error);
 2530                     newvp = NFSTOV(np);
 2531                 }
 2532                 if (!attrflag && *npp == NULL) {
 2533                         if (newvp == dvp)
 2534                                 vrele(newvp);
 2535                         else
 2536                                 vput(newvp);
 2537                         return (ENOENT);
 2538                 }
 2539                 if (attrflag)
 2540                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2541                             0, 1);
 2542         }
 2543         if (npp && *npp == NULL) {
 2544                 if (error) {
 2545                         if (newvp) {
 2546                                 if (newvp == dvp)
 2547                                         vrele(newvp);
 2548                                 else
 2549                                         vput(newvp);
 2550                         }
 2551                 } else
 2552                         *npp = np;
 2553         }
 2554         if (error && NFS_ISV4(dvp))
 2555                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2556         return (error);
 2557 }
 2558 
 2559 /*
 2560  * Nfs Version 3 and 4 commit rpc
 2561  */
 2562 int
 2563 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2564    struct thread *td)
 2565 {
 2566         struct nfsvattr nfsva;
 2567         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2568         int error, attrflag;
 2569 
 2570         mtx_lock(&nmp->nm_mtx);
 2571         if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
 2572                 mtx_unlock(&nmp->nm_mtx);
 2573                 return (0);
 2574         }
 2575         mtx_unlock(&nmp->nm_mtx);
 2576         error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
 2577             &attrflag, NULL);
 2578         if (attrflag != 0)
 2579                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
 2580                     0, 1);
 2581         if (error != 0 && NFS_ISV4(vp))
 2582                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2583         return (error);
 2584 }
 2585 
 2586 /*
 2587  * Strategy routine.
 2588  * For async requests when nfsiod(s) are running, queue the request by
 2589  * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
 2590  * request.
 2591  */
 2592 static int
 2593 nfs_strategy(struct vop_strategy_args *ap)
 2594 {
 2595         struct buf *bp = ap->a_bp;
 2596         struct ucred *cr;
 2597 
 2598         KASSERT(!(bp->b_flags & B_DONE),
 2599             ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2600         BUF_ASSERT_HELD(bp);
 2601 
 2602         if (bp->b_iocmd == BIO_READ)
 2603                 cr = bp->b_rcred;
 2604         else
 2605                 cr = bp->b_wcred;
 2606 
 2607         /*
 2608          * If the op is asynchronous and an i/o daemon is waiting
 2609          * queue the request, wake it up and wait for completion
 2610          * otherwise just do it ourselves.
 2611          */
 2612         if ((bp->b_flags & B_ASYNC) == 0 ||
 2613             ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
 2614                 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
 2615         return (0);
 2616 }
 2617 
 2618 /*
 2619  * fsync vnode op. Just call ncl_flush() with commit == 1.
 2620  */
 2621 /* ARGSUSED */
 2622 static int
 2623 nfs_fsync(struct vop_fsync_args *ap)
 2624 {
 2625 
 2626         if (ap->a_vp->v_type != VREG) {
 2627                 /*
 2628                  * For NFS, metadata is changed synchronously on the server,
 2629                  * so there is nothing to flush. Also, ncl_flush() clears
 2630                  * the NMODIFIED flag and that shouldn't be done here for
 2631                  * directories.
 2632                  */
 2633                 return (0);
 2634         }
 2635         return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0));
 2636 }
 2637 
 2638 /*
 2639  * Flush all the blocks associated with a vnode.
 2640  *      Walk through the buffer pool and push any dirty pages
 2641  *      associated with the vnode.
 2642  * If the called_from_renewthread argument is TRUE, it has been called
 2643  * from the NFSv4 renew thread and, as such, cannot block indefinitely
 2644  * waiting for a buffer write to complete.
 2645  */
 2646 int
 2647 ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td,
 2648     int commit, int called_from_renewthread)
 2649 {
 2650         struct nfsnode *np = VTONFS(vp);
 2651         struct buf *bp;
 2652         int i;
 2653         struct buf *nbp;
 2654         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2655         int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2656         int passone = 1, trycnt = 0;
 2657         u_quad_t off, endoff, toff;
 2658         struct ucred* wcred = NULL;
 2659         struct buf **bvec = NULL;
 2660         struct bufobj *bo;
 2661 #ifndef NFS_COMMITBVECSIZ
 2662 #define NFS_COMMITBVECSIZ       20
 2663 #endif
 2664         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2665         int bvecsize = 0, bveccount;
 2666 
 2667         if (called_from_renewthread != 0)
 2668                 slptimeo = hz;
 2669         if (nmp->nm_flag & NFSMNT_INT)
 2670                 slpflag = PCATCH;
 2671         if (!commit)
 2672                 passone = 0;
 2673         bo = &vp->v_bufobj;
 2674         /*
 2675          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2676          * server, but has not been committed to stable storage on the server
 2677          * yet. On the first pass, the byte range is worked out and the commit
 2678          * rpc is done. On the second pass, ncl_writebp() is called to do the
 2679          * job.
 2680          */
 2681 again:
 2682         off = (u_quad_t)-1;
 2683         endoff = 0;
 2684         bvecpos = 0;
 2685         if (NFS_ISV34(vp) && commit) {
 2686                 if (bvec != NULL && bvec != bvec_on_stack)
 2687                         free(bvec, M_TEMP);
 2688                 /*
 2689                  * Count up how many buffers waiting for a commit.
 2690                  */
 2691                 bveccount = 0;
 2692                 BO_LOCK(bo);
 2693                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2694                         if (!BUF_ISLOCKED(bp) &&
 2695                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2696                                 == (B_DELWRI | B_NEEDCOMMIT))
 2697                                 bveccount++;
 2698                 }
 2699                 /*
 2700                  * Allocate space to remember the list of bufs to commit.  It is
 2701                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 2702                  * If we can't get memory (for whatever reason), we will end up
 2703                  * committing the buffers one-by-one in the loop below.
 2704                  */
 2705                 if (bveccount > NFS_COMMITBVECSIZ) {
 2706                         /*
 2707                          * Release the vnode interlock to avoid a lock
 2708                          * order reversal.
 2709                          */
 2710                         BO_UNLOCK(bo);
 2711                         bvec = (struct buf **)
 2712                                 malloc(bveccount * sizeof(struct buf *),
 2713                                        M_TEMP, M_NOWAIT);
 2714                         BO_LOCK(bo);
 2715                         if (bvec == NULL) {
 2716                                 bvec = bvec_on_stack;
 2717                                 bvecsize = NFS_COMMITBVECSIZ;
 2718                         } else
 2719                                 bvecsize = bveccount;
 2720                 } else {
 2721                         bvec = bvec_on_stack;
 2722                         bvecsize = NFS_COMMITBVECSIZ;
 2723                 }
 2724                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2725                         if (bvecpos >= bvecsize)
 2726                                 break;
 2727                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2728                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2729                                 continue;
 2730                         }
 2731                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2732                             (B_DELWRI | B_NEEDCOMMIT)) {
 2733                                 BUF_UNLOCK(bp);
 2734                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2735                                 continue;
 2736                         }
 2737                         BO_UNLOCK(bo);
 2738                         bremfree(bp);
 2739                         /*
 2740                          * Work out if all buffers are using the same cred
 2741                          * so we can deal with them all with one commit.
 2742                          *
 2743                          * NOTE: we are not clearing B_DONE here, so we have
 2744                          * to do it later on in this routine if we intend to
 2745                          * initiate I/O on the bp.
 2746                          *
 2747                          * Note: to avoid loopback deadlocks, we do not
 2748                          * assign b_runningbufspace.
 2749                          */
 2750                         if (wcred == NULL)
 2751                                 wcred = bp->b_wcred;
 2752                         else if (wcred != bp->b_wcred)
 2753                                 wcred = NOCRED;
 2754                         vfs_busy_pages(bp, 1);
 2755 
 2756                         BO_LOCK(bo);
 2757                         /*
 2758                          * bp is protected by being locked, but nbp is not
 2759                          * and vfs_busy_pages() may sleep.  We have to
 2760                          * recalculate nbp.
 2761                          */
 2762                         nbp = TAILQ_NEXT(bp, b_bobufs);
 2763 
 2764                         /*
 2765                          * A list of these buffers is kept so that the
 2766                          * second loop knows which buffers have actually
 2767                          * been committed. This is necessary, since there
 2768                          * may be a race between the commit rpc and new
 2769                          * uncommitted writes on the file.
 2770                          */
 2771                         bvec[bvecpos++] = bp;
 2772                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2773                                 bp->b_dirtyoff;
 2774                         if (toff < off)
 2775                                 off = toff;
 2776                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2777                         if (toff > endoff)
 2778                                 endoff = toff;
 2779                 }
 2780                 BO_UNLOCK(bo);
 2781         }
 2782         if (bvecpos > 0) {
 2783                 /*
 2784                  * Commit data on the server, as required.
 2785                  * If all bufs are using the same wcred, then use that with
 2786                  * one call for all of them, otherwise commit each one
 2787                  * separately.
 2788                  */
 2789                 if (wcred != NOCRED)
 2790                         retv = ncl_commit(vp, off, (int)(endoff - off),
 2791                                           wcred, td);
 2792                 else {
 2793                         retv = 0;
 2794                         for (i = 0; i < bvecpos; i++) {
 2795                                 off_t off, size;
 2796                                 bp = bvec[i];
 2797                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2798                                         bp->b_dirtyoff;
 2799                                 size = (u_quad_t)(bp->b_dirtyend
 2800                                                   - bp->b_dirtyoff);
 2801                                 retv = ncl_commit(vp, off, (int)size,
 2802                                                   bp->b_wcred, td);
 2803                                 if (retv) break;
 2804                         }
 2805                 }
 2806 
 2807                 if (retv == NFSERR_STALEWRITEVERF)
 2808                         ncl_clearcommit(vp->v_mount);
 2809 
 2810                 /*
 2811                  * Now, either mark the blocks I/O done or mark the
 2812                  * blocks dirty, depending on whether the commit
 2813                  * succeeded.
 2814                  */
 2815                 for (i = 0; i < bvecpos; i++) {
 2816                         bp = bvec[i];
 2817                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 2818                         if (retv) {
 2819                                 /*
 2820                                  * Error, leave B_DELWRI intact
 2821                                  */
 2822                                 vfs_unbusy_pages(bp);
 2823                                 brelse(bp);
 2824                         } else {
 2825                                 /*
 2826                                  * Success, remove B_DELWRI ( bundirty() ).
 2827                                  *
 2828                                  * b_dirtyoff/b_dirtyend seem to be NFS
 2829                                  * specific.  We should probably move that
 2830                                  * into bundirty(). XXX
 2831                                  */
 2832                                 bufobj_wref(bo);
 2833                                 bp->b_flags |= B_ASYNC;
 2834                                 bundirty(bp);
 2835                                 bp->b_flags &= ~B_DONE;
 2836                                 bp->b_ioflags &= ~BIO_ERROR;
 2837                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2838                                 bufdone(bp);
 2839                         }
 2840                 }
 2841         }
 2842 
 2843         /*
 2844          * Start/do any write(s) that are required.
 2845          */
 2846 loop:
 2847         BO_LOCK(bo);
 2848         TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2849                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2850                         if (waitfor != MNT_WAIT || passone)
 2851                                 continue;
 2852 
 2853                         error = BUF_TIMELOCK(bp,
 2854                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 2855                             BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
 2856                         if (error == 0) {
 2857                                 BUF_UNLOCK(bp);
 2858                                 goto loop;
 2859                         }
 2860                         if (error == ENOLCK) {
 2861                                 error = 0;
 2862                                 goto loop;
 2863                         }
 2864                         if (called_from_renewthread != 0) {
 2865                                 /*
 2866                                  * Return EIO so the flush will be retried
 2867                                  * later.
 2868                                  */
 2869                                 error = EIO;
 2870                                 goto done;
 2871                         }
 2872                         if (newnfs_sigintr(nmp, td)) {
 2873                                 error = EINTR;
 2874                                 goto done;
 2875                         }
 2876                         if (slpflag == PCATCH) {
 2877                                 slpflag = 0;
 2878                                 slptimeo = 2 * hz;
 2879                         }
 2880                         goto loop;
 2881                 }
 2882                 if ((bp->b_flags & B_DELWRI) == 0)
 2883                         panic("nfs_fsync: not dirty");
 2884                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 2885                         BUF_UNLOCK(bp);
 2886                         continue;
 2887                 }
 2888                 BO_UNLOCK(bo);
 2889                 bremfree(bp);
 2890                 if (passone || !commit)
 2891                     bp->b_flags |= B_ASYNC;
 2892                 else
 2893                     bp->b_flags |= B_ASYNC;
 2894                 bwrite(bp);
 2895                 if (newnfs_sigintr(nmp, td)) {
 2896                         error = EINTR;
 2897                         goto done;
 2898                 }
 2899                 goto loop;
 2900         }
 2901         if (passone) {
 2902                 passone = 0;
 2903                 BO_UNLOCK(bo);
 2904                 goto again;
 2905         }
 2906         if (waitfor == MNT_WAIT) {
 2907                 while (bo->bo_numoutput) {
 2908                         error = bufobj_wwait(bo, slpflag, slptimeo);
 2909                         if (error) {
 2910                             BO_UNLOCK(bo);
 2911                             if (called_from_renewthread != 0) {
 2912                                 /*
 2913                                  * Return EIO so that the flush will be
 2914                                  * retried later.
 2915                                  */
 2916                                 error = EIO;
 2917                                 goto done;
 2918                             }
 2919                             error = newnfs_sigintr(nmp, td);
 2920                             if (error)
 2921                                 goto done;
 2922                             if (slpflag == PCATCH) {
 2923                                 slpflag = 0;
 2924                                 slptimeo = 2 * hz;
 2925                             }
 2926                             BO_LOCK(bo);
 2927                         }
 2928                 }
 2929                 if (bo->bo_dirty.bv_cnt != 0 && commit) {
 2930                         BO_UNLOCK(bo);
 2931                         goto loop;
 2932                 }
 2933                 /*
 2934                  * Wait for all the async IO requests to drain
 2935                  */
 2936                 BO_UNLOCK(bo);
 2937                 mtx_lock(&np->n_mtx);
 2938                 while (np->n_directio_asyncwr > 0) {
 2939                         np->n_flag |= NFSYNCWAIT;
 2940                         error = newnfs_msleep(td, &np->n_directio_asyncwr,
 2941                             &np->n_mtx, slpflag | (PRIBIO + 1), 
 2942                             "nfsfsync", 0);
 2943                         if (error) {
 2944                                 if (newnfs_sigintr(nmp, td)) {
 2945                                         mtx_unlock(&np->n_mtx);
 2946                                         error = EINTR;  
 2947                                         goto done;
 2948                                 }
 2949                         }
 2950                 }
 2951                 mtx_unlock(&np->n_mtx);
 2952         } else
 2953                 BO_UNLOCK(bo);
 2954         if (NFSHASPNFS(nmp)) {
 2955                 nfscl_layoutcommit(vp, td);
 2956                 /*
 2957                  * Invalidate the attribute cache, since writes to a DS
 2958                  * won't update the size attribute.
 2959                  */
 2960                 mtx_lock(&np->n_mtx);
 2961                 np->n_attrstamp = 0;
 2962         } else
 2963                 mtx_lock(&np->n_mtx);
 2964         if (np->n_flag & NWRITEERR) {
 2965                 error = np->n_error;
 2966                 np->n_flag &= ~NWRITEERR;
 2967         }
 2968         if (commit && bo->bo_dirty.bv_cnt == 0 &&
 2969             bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
 2970                 np->n_flag &= ~NMODIFIED;
 2971         mtx_unlock(&np->n_mtx);
 2972 done:
 2973         if (bvec != NULL && bvec != bvec_on_stack)
 2974                 free(bvec, M_TEMP);
 2975         if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
 2976             (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
 2977              np->n_directio_asyncwr != 0) && trycnt++ < 5) {
 2978                 /* try, try again... */
 2979                 passone = 1;
 2980                 wcred = NULL;
 2981                 bvec = NULL;
 2982                 bvecsize = 0;
 2983 printf("try%d\n", trycnt);
 2984                 goto again;
 2985         }
 2986         return (error);
 2987 }
 2988 
 2989 /*
 2990  * NFS advisory byte-level locks.
 2991  */
 2992 static int
 2993 nfs_advlock(struct vop_advlock_args *ap)
 2994 {
 2995         struct vnode *vp = ap->a_vp;
 2996         struct ucred *cred;
 2997         struct nfsnode *np = VTONFS(ap->a_vp);
 2998         struct proc *p = (struct proc *)ap->a_id;
 2999         struct thread *td = curthread;  /* XXX */
 3000         struct vattr va;
 3001         int ret, error = EOPNOTSUPP;
 3002         u_quad_t size;
 3003         
 3004         if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
 3005                 if (vp->v_type != VREG)
 3006                         return (EINVAL);
 3007                 if ((ap->a_flags & F_POSIX) != 0)
 3008                         cred = p->p_ucred;
 3009                 else
 3010                         cred = td->td_ucred;
 3011                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 3012                 if (vp->v_iflag & VI_DOOMED) {
 3013                         NFSVOPUNLOCK(vp, 0);
 3014                         return (EBADF);
 3015                 }
 3016 
 3017                 /*
 3018                  * If this is unlocking a write locked region, flush and
 3019                  * commit them before unlocking. This is required by
 3020                  * RFC3530 Sec. 9.3.2.
 3021                  */
 3022                 if (ap->a_op == F_UNLCK &&
 3023                     nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
 3024                     ap->a_flags))
 3025                         (void) ncl_flush(vp, MNT_WAIT, cred, td, 1, 0);
 3026 
 3027                 /*
 3028                  * Loop around doing the lock op, while a blocking lock
 3029                  * must wait for the lock op to succeed.
 3030                  */
 3031                 do {
 3032                         ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
 3033                             ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
 3034                         if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3035                             ap->a_op == F_SETLK) {
 3036                                 NFSVOPUNLOCK(vp, 0);
 3037                                 error = nfs_catnap(PZERO | PCATCH, ret,
 3038                                     "ncladvl");
 3039                                 if (error)
 3040                                         return (EINTR);
 3041                                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 3042                                 if (vp->v_iflag & VI_DOOMED) {
 3043                                         NFSVOPUNLOCK(vp, 0);
 3044                                         return (EBADF);
 3045                                 }
 3046                         }
 3047                 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3048                      ap->a_op == F_SETLK);
 3049                 if (ret == NFSERR_DENIED) {
 3050                         NFSVOPUNLOCK(vp, 0);
 3051                         return (EAGAIN);
 3052                 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
 3053                         NFSVOPUNLOCK(vp, 0);
 3054                         return (ret);
 3055                 } else if (ret != 0) {
 3056                         NFSVOPUNLOCK(vp, 0);
 3057                         return (EACCES);
 3058                 }
 3059 
 3060                 /*
 3061                  * Now, if we just got a lock, invalidate data in the buffer
 3062                  * cache, as required, so that the coherency conforms with
 3063                  * RFC3530 Sec. 9.3.2.
 3064                  */
 3065                 if (ap->a_op == F_SETLK) {
 3066                         if ((np->n_flag & NMODIFIED) == 0) {
 3067                                 np->n_attrstamp = 0;
 3068                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3069                                 ret = VOP_GETATTR(vp, &va, cred);
 3070                         }
 3071                         if ((np->n_flag & NMODIFIED) || ret ||
 3072                             np->n_change != va.va_filerev) {
 3073                                 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
 3074                                 np->n_attrstamp = 0;
 3075                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3076                                 ret = VOP_GETATTR(vp, &va, cred);
 3077                                 if (!ret) {
 3078                                         np->n_mtime = va.va_mtime;
 3079                                         np->n_change = va.va_filerev;
 3080                                 }
 3081                         }
 3082                 }
 3083                 NFSVOPUNLOCK(vp, 0);
 3084                 return (0);
 3085         } else if (!NFS_ISV4(vp)) {
 3086                 error = NFSVOPLOCK(vp, LK_SHARED);
 3087                 if (error)
 3088                         return (error);
 3089                 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3090                         size = VTONFS(vp)->n_size;
 3091                         NFSVOPUNLOCK(vp, 0);
 3092                         error = lf_advlock(ap, &(vp->v_lockf), size);
 3093                 } else {
 3094                         if (nfs_advlock_p != NULL)
 3095                                 error = nfs_advlock_p(ap);
 3096                         else {
 3097                                 NFSVOPUNLOCK(vp, 0);
 3098                                 error = ENOLCK;
 3099                         }
 3100                 }
 3101         }
 3102         return (error);
 3103 }
 3104 
 3105 /*
 3106  * NFS advisory byte-level locks.
 3107  */
 3108 static int
 3109 nfs_advlockasync(struct vop_advlockasync_args *ap)
 3110 {
 3111         struct vnode *vp = ap->a_vp;
 3112         u_quad_t size;
 3113         int error;
 3114         
 3115         if (NFS_ISV4(vp))
 3116                 return (EOPNOTSUPP);
 3117         error = NFSVOPLOCK(vp, LK_SHARED);
 3118         if (error)
 3119                 return (error);
 3120         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3121                 size = VTONFS(vp)->n_size;
 3122                 NFSVOPUNLOCK(vp, 0);
 3123                 error = lf_advlockasync(ap, &(vp->v_lockf), size);
 3124         } else {
 3125                 NFSVOPUNLOCK(vp, 0);
 3126                 error = EOPNOTSUPP;
 3127         }
 3128         return (error);
 3129 }
 3130 
 3131 /*
 3132  * Print out the contents of an nfsnode.
 3133  */
 3134 static int
 3135 nfs_print(struct vop_print_args *ap)
 3136 {
 3137         struct vnode *vp = ap->a_vp;
 3138         struct nfsnode *np = VTONFS(vp);
 3139 
 3140         ncl_printf("\tfileid %ld fsid 0x%x",
 3141            np->n_vattr.na_fileid, np->n_vattr.na_fsid);
 3142         if (vp->v_type == VFIFO)
 3143                 fifo_printinfo(vp);
 3144         printf("\n");
 3145         return (0);
 3146 }
 3147 
 3148 /*
 3149  * This is the "real" nfs::bwrite(struct buf*).
 3150  * We set B_CACHE if this is a VMIO buffer.
 3151  */
 3152 int
 3153 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
 3154 {
 3155         int s;
 3156         int oldflags = bp->b_flags;
 3157 #if 0
 3158         int retv = 1;
 3159         off_t off;
 3160 #endif
 3161 
 3162         BUF_ASSERT_HELD(bp);
 3163 
 3164         if (bp->b_flags & B_INVAL) {
 3165                 brelse(bp);
 3166                 return(0);
 3167         }
 3168 
 3169         bp->b_flags |= B_CACHE;
 3170 
 3171         /*
 3172          * Undirty the bp.  We will redirty it later if the I/O fails.
 3173          */
 3174 
 3175         s = splbio();
 3176         bundirty(bp);
 3177         bp->b_flags &= ~B_DONE;
 3178         bp->b_ioflags &= ~BIO_ERROR;
 3179         bp->b_iocmd = BIO_WRITE;
 3180 
 3181         bufobj_wref(bp->b_bufobj);
 3182         curthread->td_ru.ru_oublock++;
 3183         splx(s);
 3184 
 3185         /*
 3186          * Note: to avoid loopback deadlocks, we do not
 3187          * assign b_runningbufspace.
 3188          */
 3189         vfs_busy_pages(bp, 1);
 3190 
 3191         BUF_KERNPROC(bp);
 3192         bp->b_iooffset = dbtob(bp->b_blkno);
 3193         bstrategy(bp);
 3194 
 3195         if( (oldflags & B_ASYNC) == 0) {
 3196                 int rtval = bufwait(bp);
 3197 
 3198                 if (oldflags & B_DELWRI) {
 3199                         s = splbio();
 3200                         reassignbuf(bp);
 3201                         splx(s);
 3202                 }
 3203                 brelse(bp);
 3204                 return (rtval);
 3205         }
 3206 
 3207         return (0);
 3208 }
 3209 
 3210 /*
 3211  * nfs special file access vnode op.
 3212  * Essentially just get vattr and then imitate iaccess() since the device is
 3213  * local to the client.
 3214  */
 3215 static int
 3216 nfsspec_access(struct vop_access_args *ap)
 3217 {
 3218         struct vattr *vap;
 3219         struct ucred *cred = ap->a_cred;
 3220         struct vnode *vp = ap->a_vp;
 3221         accmode_t accmode = ap->a_accmode;
 3222         struct vattr vattr;
 3223         int error;
 3224 
 3225         /*
 3226          * Disallow write attempts on filesystems mounted read-only;
 3227          * unless the file is a socket, fifo, or a block or character
 3228          * device resident on the filesystem.
 3229          */
 3230         if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3231                 switch (vp->v_type) {
 3232                 case VREG:
 3233                 case VDIR:
 3234                 case VLNK:
 3235                         return (EROFS);
 3236                 default:
 3237                         break;
 3238                 }
 3239         }
 3240         vap = &vattr;
 3241         error = VOP_GETATTR(vp, vap, cred);
 3242         if (error)
 3243                 goto out;
 3244         error  = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
 3245             accmode, cred, NULL);
 3246 out:
 3247         return error;
 3248 }
 3249 
 3250 /*
 3251  * Read wrapper for fifos.
 3252  */
 3253 static int
 3254 nfsfifo_read(struct vop_read_args *ap)
 3255 {
 3256         struct nfsnode *np = VTONFS(ap->a_vp);
 3257         int error;
 3258 
 3259         /*
 3260          * Set access flag.
 3261          */
 3262         mtx_lock(&np->n_mtx);
 3263         np->n_flag |= NACC;
 3264         vfs_timestamp(&np->n_atim);
 3265         mtx_unlock(&np->n_mtx);
 3266         error = fifo_specops.vop_read(ap);
 3267         return error;   
 3268 }
 3269 
 3270 /*
 3271  * Write wrapper for fifos.
 3272  */
 3273 static int
 3274 nfsfifo_write(struct vop_write_args *ap)
 3275 {
 3276         struct nfsnode *np = VTONFS(ap->a_vp);
 3277 
 3278         /*
 3279          * Set update flag.
 3280          */
 3281         mtx_lock(&np->n_mtx);
 3282         np->n_flag |= NUPD;
 3283         vfs_timestamp(&np->n_mtim);
 3284         mtx_unlock(&np->n_mtx);
 3285         return(fifo_specops.vop_write(ap));
 3286 }
 3287 
 3288 /*
 3289  * Close wrapper for fifos.
 3290  *
 3291  * Update the times on the nfsnode then do fifo close.
 3292  */
 3293 static int
 3294 nfsfifo_close(struct vop_close_args *ap)
 3295 {
 3296         struct vnode *vp = ap->a_vp;
 3297         struct nfsnode *np = VTONFS(vp);
 3298         struct vattr vattr;
 3299         struct timespec ts;
 3300 
 3301         mtx_lock(&np->n_mtx);
 3302         if (np->n_flag & (NACC | NUPD)) {
 3303                 vfs_timestamp(&ts);
 3304                 if (np->n_flag & NACC)
 3305                         np->n_atim = ts;
 3306                 if (np->n_flag & NUPD)
 3307                         np->n_mtim = ts;
 3308                 np->n_flag |= NCHG;
 3309                 if (vrefcnt(vp) == 1 &&
 3310                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3311                         VATTR_NULL(&vattr);
 3312                         if (np->n_flag & NACC)
 3313                                 vattr.va_atime = np->n_atim;
 3314                         if (np->n_flag & NUPD)
 3315                                 vattr.va_mtime = np->n_mtim;
 3316                         mtx_unlock(&np->n_mtx);
 3317                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 3318                         goto out;
 3319                 }
 3320         }
 3321         mtx_unlock(&np->n_mtx);
 3322 out:
 3323         return (fifo_specops.vop_close(ap));
 3324 }
 3325 
 3326 /*
 3327  * Just call ncl_writebp() with the force argument set to 1.
 3328  *
 3329  * NOTE: B_DONE may or may not be set in a_bp on call.
 3330  */
 3331 static int
 3332 nfs_bwrite(struct buf *bp)
 3333 {
 3334 
 3335         return (ncl_writebp(bp, 1, curthread));
 3336 }
 3337 
 3338 struct buf_ops buf_ops_newnfs = {
 3339         .bop_name       =       "buf_ops_nfs",
 3340         .bop_write      =       nfs_bwrite,
 3341         .bop_strategy   =       bufstrategy,
 3342         .bop_sync       =       bufsync,
 3343         .bop_bdflush    =       bufbdflush,
 3344 };
 3345 
 3346 /*
 3347  * Cloned from vop_stdlock(), and then the ugly hack added.
 3348  */
 3349 static int
 3350 nfs_lock1(struct vop_lock1_args *ap)
 3351 {
 3352         struct vnode *vp = ap->a_vp;
 3353         int error = 0;
 3354 
 3355         /*
 3356          * Since vfs_hash_get() calls vget() and it will no longer work
 3357          * for FreeBSD8 with flags == 0, I can only think of this horrible
 3358          * hack to work around it. I call vfs_hash_get() with LK_EXCLOTHER
 3359          * and then handle it here. All I want for this case is a v_usecount
 3360          * on the vnode to use for recovery, while another thread might
 3361          * hold a lock on the vnode. I have the other threads blocked, so
 3362          * there isn't any race problem.
 3363          */
 3364         if ((ap->a_flags & LK_TYPE_MASK) == LK_EXCLOTHER) {
 3365                 if ((ap->a_flags & LK_INTERLOCK) == 0)
 3366                         panic("ncllock1");
 3367                 if ((vp->v_iflag & VI_DOOMED))
 3368                         error = ENOENT;
 3369                 VI_UNLOCK(vp);
 3370                 return (error);
 3371         }
 3372         return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
 3373             LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
 3374             ap->a_line));
 3375 }
 3376 
 3377 static int
 3378 nfs_getacl(struct vop_getacl_args *ap)
 3379 {
 3380         int error;
 3381 
 3382         if (ap->a_type != ACL_TYPE_NFS4)
 3383                 return (EOPNOTSUPP);
 3384         error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3385             NULL);
 3386         if (error > NFSERR_STALE) {
 3387                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3388                 error = EPERM;
 3389         }
 3390         return (error);
 3391 }
 3392 
 3393 static int
 3394 nfs_setacl(struct vop_setacl_args *ap)
 3395 {
 3396         int error;
 3397 
 3398         if (ap->a_type != ACL_TYPE_NFS4)
 3399                 return (EOPNOTSUPP);
 3400         error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3401             NULL);
 3402         if (error > NFSERR_STALE) {
 3403                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3404                 error = EPERM;
 3405         }
 3406         return (error);
 3407 }
 3408 
 3409 /*
 3410  * Return POSIX pathconf information applicable to nfs filesystems.
 3411  */
 3412 static int
 3413 nfs_pathconf(struct vop_pathconf_args *ap)
 3414 {
 3415         struct nfsv3_pathconf pc;
 3416         struct nfsvattr nfsva;
 3417         struct vnode *vp = ap->a_vp;
 3418         struct thread *td = curthread;
 3419         int attrflag, error;
 3420 
 3421         if (NFS_ISV4(vp) || (NFS_ISV3(vp) && (ap->a_name == _PC_LINK_MAX ||
 3422             ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
 3423             ap->a_name == _PC_NO_TRUNC))) {
 3424                 /*
 3425                  * Since only the above 4 a_names are returned by the NFSv3
 3426                  * Pathconf RPC, there is no point in doing it for others.
 3427                  */
 3428                 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
 3429                     &attrflag, NULL);
 3430                 if (attrflag != 0)
 3431                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 3432                             1);
 3433                 if (error != 0)
 3434                         return (error);
 3435         } else {
 3436                 /*
 3437                  * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
 3438                  * just fake them.
 3439                  */
 3440                 pc.pc_linkmax = LINK_MAX;
 3441                 pc.pc_namemax = NFS_MAXNAMLEN;
 3442                 pc.pc_notrunc = 1;
 3443                 pc.pc_chownrestricted = 1;
 3444                 pc.pc_caseinsensitive = 0;
 3445                 pc.pc_casepreserving = 1;
 3446                 error = 0;
 3447         }
 3448         switch (ap->a_name) {
 3449         case _PC_LINK_MAX:
 3450                 *ap->a_retval = pc.pc_linkmax;
 3451                 break;
 3452         case _PC_NAME_MAX:
 3453                 *ap->a_retval = pc.pc_namemax;
 3454                 break;
 3455         case _PC_PATH_MAX:
 3456                 *ap->a_retval = PATH_MAX;
 3457                 break;
 3458         case _PC_PIPE_BUF:
 3459                 *ap->a_retval = PIPE_BUF;
 3460                 break;
 3461         case _PC_CHOWN_RESTRICTED:
 3462                 *ap->a_retval = pc.pc_chownrestricted;
 3463                 break;
 3464         case _PC_NO_TRUNC:
 3465                 *ap->a_retval = pc.pc_notrunc;
 3466                 break;
 3467         case _PC_ACL_EXTENDED:
 3468                 *ap->a_retval = 0;
 3469                 break;
 3470         case _PC_ACL_NFS4:
 3471                 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
 3472                     NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
 3473                         *ap->a_retval = 1;
 3474                 else
 3475                         *ap->a_retval = 0;
 3476                 break;
 3477         case _PC_ACL_PATH_MAX:
 3478                 if (NFS_ISV4(vp))
 3479                         *ap->a_retval = ACL_MAX_ENTRIES;
 3480                 else
 3481                         *ap->a_retval = 3;
 3482                 break;
 3483         case _PC_MAC_PRESENT:
 3484                 *ap->a_retval = 0;
 3485                 break;
 3486         case _PC_ASYNC_IO:
 3487                 /* _PC_ASYNC_IO should have been handled by upper layers. */
 3488                 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
 3489                 error = EINVAL;
 3490                 break;
 3491         case _PC_PRIO_IO:
 3492                 *ap->a_retval = 0;
 3493                 break;
 3494         case _PC_SYNC_IO:
 3495                 *ap->a_retval = 0;
 3496                 break;
 3497         case _PC_ALLOC_SIZE_MIN:
 3498                 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
 3499                 break;
 3500         case _PC_FILESIZEBITS:
 3501                 if (NFS_ISV34(vp))
 3502                         *ap->a_retval = 64;
 3503                 else
 3504                         *ap->a_retval = 32;
 3505                 break;
 3506         case _PC_REC_INCR_XFER_SIZE:
 3507                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3508                 break;
 3509         case _PC_REC_MAX_XFER_SIZE:
 3510                 *ap->a_retval = -1; /* means ``unlimited'' */
 3511                 break;
 3512         case _PC_REC_MIN_XFER_SIZE:
 3513                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3514                 break;
 3515         case _PC_REC_XFER_ALIGN:
 3516                 *ap->a_retval = PAGE_SIZE;
 3517                 break;
 3518         case _PC_SYMLINK_MAX:
 3519                 *ap->a_retval = NFS_MAXPATHLEN;
 3520                 break;
 3521 
 3522         default:
 3523                 error = EINVAL;
 3524                 break;
 3525         }
 3526         return (error);
 3527 }
 3528 

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