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

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from nfs_vnops.c        8.16 (Berkeley) 5/27/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: stable/9/sys/fs/nfsclient/nfs_clvnops.c 286558 2015-08-09 22:07:52Z 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 MALLOC_DECLARE(M_NEWNFSREQ);
  107 
  108 /*
  109  * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
  110  * calls are not in getblk() and brelse() so that they would not be necessary
  111  * here.
  112  */
  113 #ifndef B_VMIO
  114 #define vfs_busy_pages(bp, f)
  115 #endif
  116 
  117 static vop_read_t       nfsfifo_read;
  118 static vop_write_t      nfsfifo_write;
  119 static vop_close_t      nfsfifo_close;
  120 static int      nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
  121                     struct thread *);
  122 static vop_lookup_t     nfs_lookup;
  123 static vop_create_t     nfs_create;
  124 static vop_mknod_t      nfs_mknod;
  125 static vop_open_t       nfs_open;
  126 static vop_pathconf_t   nfs_pathconf;
  127 static vop_close_t      nfs_close;
  128 static vop_access_t     nfs_access;
  129 static vop_getattr_t    nfs_getattr;
  130 static vop_setattr_t    nfs_setattr;
  131 static vop_read_t       nfs_read;
  132 static vop_fsync_t      nfs_fsync;
  133 static vop_remove_t     nfs_remove;
  134 static vop_link_t       nfs_link;
  135 static vop_rename_t     nfs_rename;
  136 static vop_mkdir_t      nfs_mkdir;
  137 static vop_rmdir_t      nfs_rmdir;
  138 static vop_symlink_t    nfs_symlink;
  139 static vop_readdir_t    nfs_readdir;
  140 static vop_strategy_t   nfs_strategy;
  141 static vop_lock1_t      nfs_lock1;
  142 static  int     nfs_lookitup(struct vnode *, char *, int,
  143                     struct ucred *, struct thread *, struct nfsnode **);
  144 static  int     nfs_sillyrename(struct vnode *, struct vnode *,
  145                     struct componentname *);
  146 static vop_access_t     nfsspec_access;
  147 static vop_readlink_t   nfs_readlink;
  148 static vop_print_t      nfs_print;
  149 static vop_advlock_t    nfs_advlock;
  150 static vop_advlockasync_t nfs_advlockasync;
  151 static vop_getacl_t nfs_getacl;
  152 static vop_setacl_t nfs_setacl;
  153 
  154 /*
  155  * Global vfs data structures for nfs
  156  */
  157 struct vop_vector newnfs_vnodeops = {
  158         .vop_default =          &default_vnodeops,
  159         .vop_access =           nfs_access,
  160         .vop_advlock =          nfs_advlock,
  161         .vop_advlockasync =     nfs_advlockasync,
  162         .vop_close =            nfs_close,
  163         .vop_create =           nfs_create,
  164         .vop_fsync =            nfs_fsync,
  165         .vop_getattr =          nfs_getattr,
  166         .vop_getpages =         ncl_getpages,
  167         .vop_putpages =         ncl_putpages,
  168         .vop_inactive =         ncl_inactive,
  169         .vop_link =             nfs_link,
  170         .vop_lock1 =            nfs_lock1,
  171         .vop_lookup =           nfs_lookup,
  172         .vop_mkdir =            nfs_mkdir,
  173         .vop_mknod =            nfs_mknod,
  174         .vop_open =             nfs_open,
  175         .vop_pathconf =         nfs_pathconf,
  176         .vop_print =            nfs_print,
  177         .vop_read =             nfs_read,
  178         .vop_readdir =          nfs_readdir,
  179         .vop_readlink =         nfs_readlink,
  180         .vop_reclaim =          ncl_reclaim,
  181         .vop_remove =           nfs_remove,
  182         .vop_rename =           nfs_rename,
  183         .vop_rmdir =            nfs_rmdir,
  184         .vop_setattr =          nfs_setattr,
  185         .vop_strategy =         nfs_strategy,
  186         .vop_symlink =          nfs_symlink,
  187         .vop_write =            ncl_write,
  188         .vop_getacl =           nfs_getacl,
  189         .vop_setacl =           nfs_setacl,
  190 };
  191 
  192 struct vop_vector newnfs_fifoops = {
  193         .vop_default =          &fifo_specops,
  194         .vop_access =           nfsspec_access,
  195         .vop_close =            nfsfifo_close,
  196         .vop_fsync =            nfs_fsync,
  197         .vop_getattr =          nfs_getattr,
  198         .vop_inactive =         ncl_inactive,
  199         .vop_print =            nfs_print,
  200         .vop_read =             nfsfifo_read,
  201         .vop_reclaim =          ncl_reclaim,
  202         .vop_setattr =          nfs_setattr,
  203         .vop_write =            nfsfifo_write,
  204 };
  205 
  206 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
  207     struct componentname *cnp, struct vattr *vap);
  208 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
  209     int namelen, struct ucred *cred, struct thread *td);
  210 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
  211     char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
  212     char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
  213 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
  214     struct componentname *scnp, struct sillyrename *sp);
  215 
  216 /*
  217  * Global variables
  218  */
  219 #define DIRHDSIZ        (sizeof (struct dirent) - (MAXNAMLEN + 1))
  220 
  221 SYSCTL_DECL(_vfs_nfs);
  222 
  223 static int      nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
  224 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
  225            &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
  226 
  227 static int      nfs_prime_access_cache = 0;
  228 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
  229            &nfs_prime_access_cache, 0,
  230            "Prime NFS ACCESS cache when fetching attributes");
  231 
  232 static int      newnfs_commit_on_close = 0;
  233 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
  234     &newnfs_commit_on_close, 0, "write+commit on close, else only write");
  235 
  236 static int      nfs_clean_pages_on_close = 1;
  237 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
  238            &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
  239 
  240 int newnfs_directio_enable = 0;
  241 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
  242            &newnfs_directio_enable, 0, "Enable NFS directio");
  243 
  244 int nfs_keep_dirty_on_error;
  245 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
  246     &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
  247 
  248 /*
  249  * This sysctl allows other processes to mmap a file that has been opened
  250  * O_DIRECT by a process.  In general, having processes mmap the file while
  251  * Direct IO is in progress can lead to Data Inconsistencies.  But, we allow
  252  * this by default to prevent DoS attacks - to prevent a malicious user from
  253  * opening up files O_DIRECT preventing other users from mmap'ing these
  254  * files.  "Protected" environments where stricter consistency guarantees are
  255  * required can disable this knob.  The process that opened the file O_DIRECT
  256  * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
  257  * meaningful.
  258  */
  259 int newnfs_directio_allow_mmap = 1;
  260 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
  261            &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
  262 
  263 #if 0
  264 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
  265            &newnfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
  266 
  267 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
  268            &newnfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
  269 #endif
  270 
  271 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY                \
  272                          | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
  273                          | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
  274 
  275 /*
  276  * SMP Locking Note :
  277  * The list of locks after the description of the lock is the ordering
  278  * of other locks acquired with the lock held.
  279  * np->n_mtx : Protects the fields in the nfsnode.
  280        VM Object Lock
  281        VI_MTX (acquired indirectly)
  282  * nmp->nm_mtx : Protects the fields in the nfsmount.
  283        rep->r_mtx
  284  * ncl_iod_mutex : Global lock, protects shared nfsiod state.
  285  * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
  286        nmp->nm_mtx
  287        rep->r_mtx
  288  * rep->r_mtx : Protects the fields in an nfsreq.
  289  */
  290 
  291 static int
  292 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
  293     struct ucred *cred, u_int32_t *retmode)
  294 {
  295         int error = 0, attrflag, i, lrupos;
  296         u_int32_t rmode;
  297         struct nfsnode *np = VTONFS(vp);
  298         struct nfsvattr nfsva;
  299 
  300         error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
  301             &rmode, NULL);
  302         if (attrflag)
  303                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
  304         if (!error) {
  305                 lrupos = 0;
  306                 mtx_lock(&np->n_mtx);
  307                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  308                         if (np->n_accesscache[i].uid == cred->cr_uid) {
  309                                 np->n_accesscache[i].mode = rmode;
  310                                 np->n_accesscache[i].stamp = time_second;
  311                                 break;
  312                         }
  313                         if (i > 0 && np->n_accesscache[i].stamp <
  314                             np->n_accesscache[lrupos].stamp)
  315                                 lrupos = i;
  316                 }
  317                 if (i == NFS_ACCESSCACHESIZE) {
  318                         np->n_accesscache[lrupos].uid = cred->cr_uid;
  319                         np->n_accesscache[lrupos].mode = rmode;
  320                         np->n_accesscache[lrupos].stamp = time_second;
  321                 }
  322                 mtx_unlock(&np->n_mtx);
  323                 if (retmode != NULL)
  324                         *retmode = rmode;
  325                 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
  326         } else if (NFS_ISV4(vp)) {
  327                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  328         }
  329 #ifdef KDTRACE_HOOKS
  330         if (error != 0)
  331                 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
  332                     error);
  333 #endif
  334         return (error);
  335 }
  336 
  337 /*
  338  * nfs access vnode op.
  339  * For nfs version 2, just return ok. File accesses may fail later.
  340  * For nfs version 3, use the access rpc to check accessibility. If file modes
  341  * are changed on the server, accesses might still fail later.
  342  */
  343 static int
  344 nfs_access(struct vop_access_args *ap)
  345 {
  346         struct vnode *vp = ap->a_vp;
  347         int error = 0, i, gotahit;
  348         u_int32_t mode, wmode, rmode;
  349         int v34 = NFS_ISV34(vp);
  350         struct nfsnode *np = VTONFS(vp);
  351 
  352         /*
  353          * Disallow write attempts on filesystems mounted read-only;
  354          * unless the file is a socket, fifo, or a block or character
  355          * device resident on the filesystem.
  356          */
  357         if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
  358             VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
  359             VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
  360                 switch (vp->v_type) {
  361                 case VREG:
  362                 case VDIR:
  363                 case VLNK:
  364                         return (EROFS);
  365                 default:
  366                         break;
  367                 }
  368         }
  369         /*
  370          * For nfs v3 or v4, check to see if we have done this recently, and if
  371          * so return our cached result instead of making an ACCESS call.
  372          * If not, do an access rpc, otherwise you are stuck emulating
  373          * ufs_access() locally using the vattr. This may not be correct,
  374          * since the server may apply other access criteria such as
  375          * client uid-->server uid mapping that we do not know about.
  376          */
  377         if (v34) {
  378                 if (ap->a_accmode & VREAD)
  379                         mode = NFSACCESS_READ;
  380                 else
  381                         mode = 0;
  382                 if (vp->v_type != VDIR) {
  383                         if (ap->a_accmode & VWRITE)
  384                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  385                         if (ap->a_accmode & VAPPEND)
  386                                 mode |= NFSACCESS_EXTEND;
  387                         if (ap->a_accmode & VEXEC)
  388                                 mode |= NFSACCESS_EXECUTE;
  389                         if (ap->a_accmode & VDELETE)
  390                                 mode |= NFSACCESS_DELETE;
  391                 } else {
  392                         if (ap->a_accmode & VWRITE)
  393                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  394                         if (ap->a_accmode & VAPPEND)
  395                                 mode |= NFSACCESS_EXTEND;
  396                         if (ap->a_accmode & VEXEC)
  397                                 mode |= NFSACCESS_LOOKUP;
  398                         if (ap->a_accmode & VDELETE)
  399                                 mode |= NFSACCESS_DELETE;
  400                         if (ap->a_accmode & VDELETE_CHILD)
  401                                 mode |= NFSACCESS_MODIFY;
  402                 }
  403                 /* XXX safety belt, only make blanket request if caching */
  404                 if (nfsaccess_cache_timeout > 0) {
  405                         wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
  406                                 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
  407                                 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
  408                 } else {
  409                         wmode = mode;
  410                 }
  411 
  412                 /*
  413                  * Does our cached result allow us to give a definite yes to
  414                  * this request?
  415                  */
  416                 gotahit = 0;
  417                 mtx_lock(&np->n_mtx);
  418                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  419                         if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
  420                             if (time_second < (np->n_accesscache[i].stamp
  421                                 + nfsaccess_cache_timeout) &&
  422                                 (np->n_accesscache[i].mode & mode) == mode) {
  423                                 NFSINCRGLOBAL(newnfsstats.accesscache_hits);
  424                                 gotahit = 1;
  425                             }
  426                             break;
  427                         }
  428                 }
  429                 mtx_unlock(&np->n_mtx);
  430 #ifdef KDTRACE_HOOKS
  431                 if (gotahit != 0)
  432                         KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
  433                             ap->a_cred->cr_uid, mode);
  434                 else
  435                         KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
  436                             ap->a_cred->cr_uid, mode);
  437 #endif
  438                 if (gotahit == 0) {
  439                         /*
  440                          * Either a no, or a don't know.  Go to the wire.
  441                          */
  442                         NFSINCRGLOBAL(newnfsstats.accesscache_misses);
  443                         error = nfs34_access_otw(vp, wmode, ap->a_td,
  444                             ap->a_cred, &rmode);
  445                         if (!error &&
  446                             (rmode & mode) != mode)
  447                                 error = EACCES;
  448                 }
  449                 return (error);
  450         } else {
  451                 if ((error = nfsspec_access(ap)) != 0) {
  452                         return (error);
  453                 }
  454                 /*
  455                  * Attempt to prevent a mapped root from accessing a file
  456                  * which it shouldn't.  We try to read a byte from the file
  457                  * if the user is root and the file is not zero length.
  458                  * After calling nfsspec_access, we should have the correct
  459                  * file size cached.
  460                  */
  461                 mtx_lock(&np->n_mtx);
  462                 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
  463                     && VTONFS(vp)->n_size > 0) {
  464                         struct iovec aiov;
  465                         struct uio auio;
  466                         char buf[1];
  467 
  468                         mtx_unlock(&np->n_mtx);
  469                         aiov.iov_base = buf;
  470                         aiov.iov_len = 1;
  471                         auio.uio_iov = &aiov;
  472                         auio.uio_iovcnt = 1;
  473                         auio.uio_offset = 0;
  474                         auio.uio_resid = 1;
  475                         auio.uio_segflg = UIO_SYSSPACE;
  476                         auio.uio_rw = UIO_READ;
  477                         auio.uio_td = ap->a_td;
  478 
  479                         if (vp->v_type == VREG)
  480                                 error = ncl_readrpc(vp, &auio, ap->a_cred);
  481                         else if (vp->v_type == VDIR) {
  482                                 char* bp;
  483                                 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
  484                                 aiov.iov_base = bp;
  485                                 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
  486                                 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
  487                                     ap->a_td);
  488                                 free(bp, M_TEMP);
  489                         } else if (vp->v_type == VLNK)
  490                                 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
  491                         else
  492                                 error = EACCES;
  493                 } else
  494                         mtx_unlock(&np->n_mtx);
  495                 return (error);
  496         }
  497 }
  498 
  499 
  500 /*
  501  * nfs open vnode op
  502  * Check to see if the type is ok
  503  * and that deletion is not in progress.
  504  * For paged in text files, you will need to flush the page cache
  505  * if consistency is lost.
  506  */
  507 /* ARGSUSED */
  508 static int
  509 nfs_open(struct vop_open_args *ap)
  510 {
  511         struct vnode *vp = ap->a_vp;
  512         struct nfsnode *np = VTONFS(vp);
  513         struct vattr vattr;
  514         int error;
  515         int fmode = ap->a_mode;
  516         struct ucred *cred;
  517 
  518         if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
  519                 return (EOPNOTSUPP);
  520 
  521         /*
  522          * For NFSv4, we need to do the Open Op before cache validation,
  523          * so that we conform to RFC3530 Sec. 9.3.1.
  524          */
  525         if (NFS_ISV4(vp)) {
  526                 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
  527                 if (error) {
  528                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  529                             (gid_t)0);
  530                         return (error);
  531                 }
  532         }
  533 
  534         /*
  535          * Now, if this Open will be doing reading, re-validate/flush the
  536          * cache, so that Close/Open coherency is maintained.
  537          */
  538         mtx_lock(&np->n_mtx);
  539         if (np->n_flag & NMODIFIED) {
  540                 mtx_unlock(&np->n_mtx);
  541                 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  542                 if (error == EINTR || error == EIO) {
  543                         if (NFS_ISV4(vp))
  544                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  545                         return (error);
  546                 }
  547                 mtx_lock(&np->n_mtx);
  548                 np->n_attrstamp = 0;
  549                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  550                 if (vp->v_type == VDIR)
  551                         np->n_direofoffset = 0;
  552                 mtx_unlock(&np->n_mtx);
  553                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  554                 if (error) {
  555                         if (NFS_ISV4(vp))
  556                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  557                         return (error);
  558                 }
  559                 mtx_lock(&np->n_mtx);
  560                 np->n_mtime = vattr.va_mtime;
  561                 if (NFS_ISV4(vp))
  562                         np->n_change = vattr.va_filerev;
  563         } else {
  564                 mtx_unlock(&np->n_mtx);
  565                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  566                 if (error) {
  567                         if (NFS_ISV4(vp))
  568                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  569                         return (error);
  570                 }
  571                 mtx_lock(&np->n_mtx);
  572                 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
  573                     NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
  574                         if (vp->v_type == VDIR)
  575                                 np->n_direofoffset = 0;
  576                         mtx_unlock(&np->n_mtx);
  577                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  578                         if (error == EINTR || error == EIO) {
  579                                 if (NFS_ISV4(vp))
  580                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  581                                 return (error);
  582                         }
  583                         mtx_lock(&np->n_mtx);
  584                         np->n_mtime = vattr.va_mtime;
  585                         if (NFS_ISV4(vp))
  586                                 np->n_change = vattr.va_filerev;
  587                 }
  588         }
  589 
  590         /*
  591          * If the object has >= 1 O_DIRECT active opens, we disable caching.
  592          */
  593         if (newnfs_directio_enable && (fmode & O_DIRECT) &&
  594             (vp->v_type == VREG)) {
  595                 if (np->n_directio_opens == 0) {
  596                         mtx_unlock(&np->n_mtx);
  597                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  598                         if (error) {
  599                                 if (NFS_ISV4(vp))
  600                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  601                                 return (error);
  602                         }
  603                         mtx_lock(&np->n_mtx);
  604                         np->n_flag |= NNONCACHE;
  605                 }
  606                 np->n_directio_opens++;
  607         }
  608 
  609         /*
  610          * If this is an open for writing, capture a reference to the
  611          * credentials, so they can be used by ncl_putpages(). Using
  612          * these write credentials is preferable to the credentials of
  613          * whatever thread happens to be doing the VOP_PUTPAGES() since
  614          * the write RPCs are less likely to fail with EACCES.
  615          */
  616         if ((fmode & FWRITE) != 0) {
  617                 cred = np->n_writecred;
  618                 np->n_writecred = crhold(ap->a_cred);
  619         } else
  620                 cred = NULL;
  621         mtx_unlock(&np->n_mtx);
  622         if (cred != NULL)
  623                 crfree(cred);
  624         vnode_create_vobject(vp, vattr.va_size, ap->a_td);
  625         return (0);
  626 }
  627 
  628 /*
  629  * nfs close vnode op
  630  * What an NFS client should do upon close after writing is a debatable issue.
  631  * Most NFS clients push delayed writes to the server upon close, basically for
  632  * two reasons:
  633  * 1 - So that any write errors may be reported back to the client process
  634  *     doing the close system call. By far the two most likely errors are
  635  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
  636  * 2 - To put a worst case upper bound on cache inconsistency between
  637  *     multiple clients for the file.
  638  * There is also a consistency problem for Version 2 of the protocol w.r.t.
  639  * not being able to tell if other clients are writing a file concurrently,
  640  * since there is no way of knowing if the changed modify time in the reply
  641  * is only due to the write for this client.
  642  * (NFS Version 3 provides weak cache consistency data in the reply that
  643  *  should be sufficient to detect and handle this case.)
  644  *
  645  * The current code does the following:
  646  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
  647  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
  648  *                     or commit them (this satisfies 1 and 2 except for the
  649  *                     case where the server crashes after this close but
  650  *                     before the commit RPC, which is felt to be "good
  651  *                     enough". Changing the last argument to ncl_flush() to
  652  *                     a 1 would force a commit operation, if it is felt a
  653  *                     commit is necessary now.
  654  * for NFS Version 4 - flush the dirty buffers and commit them, if
  655  *                     nfscl_mustflush() says this is necessary.
  656  *                     It is necessary if there is no write delegation held,
  657  *                     in order to satisfy open/close coherency.
  658  *                     If the file isn't cached on local stable storage,
  659  *                     it may be necessary in order to detect "out of space"
  660  *                     errors from the server, if the write delegation
  661  *                     issued by the server doesn't allow the file to grow.
  662  */
  663 /* ARGSUSED */
  664 static int
  665 nfs_close(struct vop_close_args *ap)
  666 {
  667         struct vnode *vp = ap->a_vp;
  668         struct nfsnode *np = VTONFS(vp);
  669         struct nfsvattr nfsva;
  670         struct ucred *cred;
  671         int error = 0, ret, localcred = 0;
  672         int fmode = ap->a_fflag;
  673 
  674         if ((vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF))
  675                 return (0);
  676         /*
  677          * During shutdown, a_cred isn't valid, so just use root.
  678          */
  679         if (ap->a_cred == NOCRED) {
  680                 cred = newnfs_getcred();
  681                 localcred = 1;
  682         } else {
  683                 cred = ap->a_cred;
  684         }
  685         if (vp->v_type == VREG) {
  686             /*
  687              * Examine and clean dirty pages, regardless of NMODIFIED.
  688              * This closes a major hole in close-to-open consistency.
  689              * We want to push out all dirty pages (and buffers) on
  690              * close, regardless of whether they were dirtied by
  691              * mmap'ed writes or via write().
  692              */
  693             if (nfs_clean_pages_on_close && vp->v_object) {
  694                 VM_OBJECT_LOCK(vp->v_object);
  695                 vm_object_page_clean(vp->v_object, 0, 0, 0);
  696                 VM_OBJECT_UNLOCK(vp->v_object);
  697             }
  698             mtx_lock(&np->n_mtx);
  699             if (np->n_flag & NMODIFIED) {
  700                 mtx_unlock(&np->n_mtx);
  701                 if (NFS_ISV3(vp)) {
  702                     /*
  703                      * Under NFSv3 we have dirty buffers to dispose of.  We
  704                      * must flush them to the NFS server.  We have the option
  705                      * of waiting all the way through the commit rpc or just
  706                      * waiting for the initial write.  The default is to only
  707                      * wait through the initial write so the data is in the
  708                      * server's cache, which is roughly similar to the state
  709                      * a standard disk subsystem leaves the file in on close().
  710                      *
  711                      * We cannot clear the NMODIFIED bit in np->n_flag due to
  712                      * potential races with other processes, and certainly
  713                      * cannot clear it if we don't commit.
  714                      * These races occur when there is no longer the old
  715                      * traditional vnode locking implemented for Vnode Ops.
  716                      */
  717                     int cm = newnfs_commit_on_close ? 1 : 0;
  718                     error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td, cm, 0);
  719                     /* np->n_flag &= ~NMODIFIED; */
  720                 } else if (NFS_ISV4(vp)) { 
  721                         if (nfscl_mustflush(vp) != 0) {
  722                                 int cm = newnfs_commit_on_close ? 1 : 0;
  723                                 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td,
  724                                     cm, 0);
  725                                 /*
  726                                  * as above w.r.t races when clearing
  727                                  * NMODIFIED.
  728                                  * np->n_flag &= ~NMODIFIED;
  729                                  */
  730                         }
  731                 } else
  732                     error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  733                 mtx_lock(&np->n_mtx);
  734             }
  735             /* 
  736              * Invalidate the attribute cache in all cases.
  737              * An open is going to fetch fresh attrs any way, other procs
  738              * on this node that have file open will be forced to do an 
  739              * otw attr fetch, but this is safe.
  740              * --> A user found that their RPC count dropped by 20% when
  741              *     this was commented out and I can't see any requirement
  742              *     for it, so I've disabled it when negative lookups are
  743              *     enabled. (What does this have to do with negative lookup
  744              *     caching? Well nothing, except it was reported by the
  745              *     same user that needed negative lookup caching and I wanted
  746              *     there to be a way to disable it to see if it
  747              *     is the cause of some caching/coherency issue that might
  748              *     crop up.)
  749              */
  750             if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) {
  751                     np->n_attrstamp = 0;
  752                     KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  753             }
  754             if (np->n_flag & NWRITEERR) {
  755                 np->n_flag &= ~NWRITEERR;
  756                 error = np->n_error;
  757             }
  758             mtx_unlock(&np->n_mtx);
  759         }
  760 
  761         if (NFS_ISV4(vp)) {
  762                 /*
  763                  * Get attributes so "change" is up to date.
  764                  */
  765                 if (error == 0 && nfscl_mustflush(vp) != 0 &&
  766                     vp->v_type == VREG &&
  767                     (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) {
  768                         ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
  769                             NULL);
  770                         if (!ret) {
  771                                 np->n_change = nfsva.na_filerev;
  772                                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
  773                                     NULL, 0, 0);
  774                         }
  775                 }
  776 
  777                 /*
  778                  * and do the close.
  779                  */
  780                 ret = nfsrpc_close(vp, 0, ap->a_td);
  781                 if (!error && ret)
  782                         error = ret;
  783                 if (error)
  784                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  785                             (gid_t)0);
  786         }
  787         if (newnfs_directio_enable)
  788                 KASSERT((np->n_directio_asyncwr == 0),
  789                         ("nfs_close: dirty unflushed (%d) directio buffers\n",
  790                          np->n_directio_asyncwr));
  791         if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  792                 mtx_lock(&np->n_mtx);
  793                 KASSERT((np->n_directio_opens > 0), 
  794                         ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
  795                 np->n_directio_opens--;
  796                 if (np->n_directio_opens == 0)
  797                         np->n_flag &= ~NNONCACHE;
  798                 mtx_unlock(&np->n_mtx);
  799         }
  800         if (localcred)
  801                 NFSFREECRED(cred);
  802         return (error);
  803 }
  804 
  805 /*
  806  * nfs getattr call from vfs.
  807  */
  808 static int
  809 nfs_getattr(struct vop_getattr_args *ap)
  810 {
  811         struct vnode *vp = ap->a_vp;
  812         struct thread *td = curthread;  /* XXX */
  813         struct nfsnode *np = VTONFS(vp);
  814         int error = 0;
  815         struct nfsvattr nfsva;
  816         struct vattr *vap = ap->a_vap;
  817         struct vattr vattr;
  818 
  819         /*
  820          * Update local times for special files.
  821          */
  822         mtx_lock(&np->n_mtx);
  823         if (np->n_flag & (NACC | NUPD))
  824                 np->n_flag |= NCHG;
  825         mtx_unlock(&np->n_mtx);
  826         /*
  827          * First look in the cache.
  828          */
  829         if (ncl_getattrcache(vp, &vattr) == 0) {
  830                 vap->va_type = vattr.va_type;
  831                 vap->va_mode = vattr.va_mode;
  832                 vap->va_nlink = vattr.va_nlink;
  833                 vap->va_uid = vattr.va_uid;
  834                 vap->va_gid = vattr.va_gid;
  835                 vap->va_fsid = vattr.va_fsid;
  836                 vap->va_fileid = vattr.va_fileid;
  837                 vap->va_size = vattr.va_size;
  838                 vap->va_blocksize = vattr.va_blocksize;
  839                 vap->va_atime = vattr.va_atime;
  840                 vap->va_mtime = vattr.va_mtime;
  841                 vap->va_ctime = vattr.va_ctime;
  842                 vap->va_gen = vattr.va_gen;
  843                 vap->va_flags = vattr.va_flags;
  844                 vap->va_rdev = vattr.va_rdev;
  845                 vap->va_bytes = vattr.va_bytes;
  846                 vap->va_filerev = vattr.va_filerev;
  847                 /*
  848                  * Get the local modify time for the case of a write
  849                  * delegation.
  850                  */
  851                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  852                 return (0);
  853         }
  854 
  855         if (NFS_ISV34(vp) && nfs_prime_access_cache &&
  856             nfsaccess_cache_timeout > 0) {
  857                 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
  858                 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
  859                 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
  860                         nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
  861                         return (0);
  862                 }
  863         }
  864         error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
  865         if (!error)
  866                 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
  867         if (!error) {
  868                 /*
  869                  * Get the local modify time for the case of a write
  870                  * delegation.
  871                  */
  872                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  873         } else if (NFS_ISV4(vp)) {
  874                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  875         }
  876         return (error);
  877 }
  878 
  879 /*
  880  * nfs setattr call.
  881  */
  882 static int
  883 nfs_setattr(struct vop_setattr_args *ap)
  884 {
  885         struct vnode *vp = ap->a_vp;
  886         struct nfsnode *np = VTONFS(vp);
  887         struct thread *td = curthread;  /* XXX */
  888         struct vattr *vap = ap->a_vap;
  889         int error = 0;
  890         u_quad_t tsize;
  891 
  892 #ifndef nolint
  893         tsize = (u_quad_t)0;
  894 #endif
  895 
  896         /*
  897          * Setting of flags and marking of atimes are not supported.
  898          */
  899         if (vap->va_flags != VNOVAL)
  900                 return (EOPNOTSUPP);
  901 
  902         /*
  903          * Disallow write attempts if the filesystem is mounted read-only.
  904          */
  905         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  906             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  907             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  908             (vp->v_mount->mnt_flag & MNT_RDONLY))
  909                 return (EROFS);
  910         if (vap->va_size != VNOVAL) {
  911                 switch (vp->v_type) {
  912                 case VDIR:
  913                         return (EISDIR);
  914                 case VCHR:
  915                 case VBLK:
  916                 case VSOCK:
  917                 case VFIFO:
  918                         if (vap->va_mtime.tv_sec == VNOVAL &&
  919                             vap->va_atime.tv_sec == VNOVAL &&
  920                             vap->va_mode == (mode_t)VNOVAL &&
  921                             vap->va_uid == (uid_t)VNOVAL &&
  922                             vap->va_gid == (gid_t)VNOVAL)
  923                                 return (0);             
  924                         vap->va_size = VNOVAL;
  925                         break;
  926                 default:
  927                         /*
  928                          * Disallow write attempts if the filesystem is
  929                          * mounted read-only.
  930                          */
  931                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  932                                 return (EROFS);
  933                         /*
  934                          *  We run vnode_pager_setsize() early (why?),
  935                          * we must set np->n_size now to avoid vinvalbuf
  936                          * V_SAVE races that might setsize a lower
  937                          * value.
  938                          */
  939                         mtx_lock(&np->n_mtx);
  940                         tsize = np->n_size;
  941                         mtx_unlock(&np->n_mtx);
  942                         error = ncl_meta_setsize(vp, ap->a_cred, td,
  943                             vap->va_size);
  944                         mtx_lock(&np->n_mtx);
  945                         if (np->n_flag & NMODIFIED) {
  946                             tsize = np->n_size;
  947                             mtx_unlock(&np->n_mtx);
  948                             if (vap->va_size == 0)
  949                                 error = ncl_vinvalbuf(vp, 0, td, 1);
  950                             else
  951                                 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
  952                             if (error) {
  953                                 vnode_pager_setsize(vp, tsize);
  954                                 return (error);
  955                             }
  956                             /*
  957                              * Call nfscl_delegmodtime() to set the modify time
  958                              * locally, as required.
  959                              */
  960                             nfscl_delegmodtime(vp);
  961                         } else
  962                             mtx_unlock(&np->n_mtx);
  963                         /*
  964                          * np->n_size has already been set to vap->va_size
  965                          * in ncl_meta_setsize(). We must set it again since
  966                          * nfs_loadattrcache() could be called through
  967                          * ncl_meta_setsize() and could modify np->n_size.
  968                          */
  969                         mtx_lock(&np->n_mtx);
  970                         np->n_vattr.na_size = np->n_size = vap->va_size;
  971                         mtx_unlock(&np->n_mtx);
  972                 };
  973         } else {
  974                 mtx_lock(&np->n_mtx);
  975                 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 
  976                     (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
  977                         mtx_unlock(&np->n_mtx);
  978                         if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
  979                             (error == EINTR || error == EIO))
  980                                 return (error);
  981                 } else
  982                         mtx_unlock(&np->n_mtx);
  983         }
  984         error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
  985         if (error && vap->va_size != VNOVAL) {
  986                 mtx_lock(&np->n_mtx);
  987                 np->n_size = np->n_vattr.na_size = tsize;
  988                 vnode_pager_setsize(vp, tsize);
  989                 mtx_unlock(&np->n_mtx);
  990         }
  991         return (error);
  992 }
  993 
  994 /*
  995  * Do an nfs setattr rpc.
  996  */
  997 static int
  998 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
  999     struct thread *td)
 1000 {
 1001         struct nfsnode *np = VTONFS(vp);
 1002         int error, ret, attrflag, i;
 1003         struct nfsvattr nfsva;
 1004 
 1005         if (NFS_ISV34(vp)) {
 1006                 mtx_lock(&np->n_mtx);
 1007                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
 1008                         np->n_accesscache[i].stamp = 0;
 1009                 np->n_flag |= NDELEGMOD;
 1010                 mtx_unlock(&np->n_mtx);
 1011                 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
 1012         }
 1013         error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
 1014             NULL);
 1015         if (attrflag) {
 1016                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1017                 if (ret && !error)
 1018                         error = ret;
 1019         }
 1020         if (error && NFS_ISV4(vp))
 1021                 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
 1022         return (error);
 1023 }
 1024 
 1025 /*
 1026  * nfs lookup call, one step at a time...
 1027  * First look in cache
 1028  * If not found, unlock the directory nfsnode and do the rpc
 1029  */
 1030 static int
 1031 nfs_lookup(struct vop_lookup_args *ap)
 1032 {
 1033         struct componentname *cnp = ap->a_cnp;
 1034         struct vnode *dvp = ap->a_dvp;
 1035         struct vnode **vpp = ap->a_vpp;
 1036         struct mount *mp = dvp->v_mount;
 1037         int flags = cnp->cn_flags;
 1038         struct vnode *newvp;
 1039         struct nfsmount *nmp;
 1040         struct nfsnode *np, *newnp;
 1041         int error = 0, attrflag, dattrflag, ltype, ncticks;
 1042         struct thread *td = cnp->cn_thread;
 1043         struct nfsfh *nfhp;
 1044         struct nfsvattr dnfsva, nfsva;
 1045         struct vattr vattr;
 1046         struct timespec nctime;
 1047         
 1048         *vpp = NULLVP;
 1049         if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
 1050             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
 1051                 return (EROFS);
 1052         if (dvp->v_type != VDIR)
 1053                 return (ENOTDIR);
 1054         nmp = VFSTONFS(mp);
 1055         np = VTONFS(dvp);
 1056 
 1057         /* For NFSv4, wait until any remove is done. */
 1058         mtx_lock(&np->n_mtx);
 1059         while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
 1060                 np->n_flag |= NREMOVEWANT;
 1061                 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
 1062         }
 1063         mtx_unlock(&np->n_mtx);
 1064 
 1065         if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
 1066                 return (error);
 1067         error = cache_lookup_times(dvp, vpp, cnp, &nctime, &ncticks);
 1068         if (error > 0 && error != ENOENT)
 1069                 return (error);
 1070         if (error == -1) {
 1071                 /*
 1072                  * Lookups of "." are special and always return the
 1073                  * current directory.  cache_lookup() already handles
 1074                  * associated locking bookkeeping, etc.
 1075                  */
 1076                 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
 1077                         /* XXX: Is this really correct? */
 1078                         if (cnp->cn_nameiop != LOOKUP &&
 1079                             (flags & ISLASTCN))
 1080                                 cnp->cn_flags |= SAVENAME;
 1081                         return (0);
 1082                 }
 1083 
 1084                 /*
 1085                  * We only accept a positive hit in the cache if the
 1086                  * change time of the file matches our cached copy.
 1087                  * Otherwise, we discard the cache entry and fallback
 1088                  * to doing a lookup RPC.  We also only trust cache
 1089                  * entries for less than nm_nametimeo seconds.
 1090                  *
 1091                  * To better handle stale file handles and attributes,
 1092                  * clear the attribute cache of this node if it is a
 1093                  * leaf component, part of an open() call, and not
 1094                  * locally modified before fetching the attributes.
 1095                  * This should allow stale file handles to be detected
 1096                  * here where we can fall back to a LOOKUP RPC to
 1097                  * recover rather than having nfs_open() detect the
 1098                  * stale file handle and failing open(2) with ESTALE.
 1099                  */
 1100                 newvp = *vpp;
 1101                 newnp = VTONFS(newvp);
 1102                 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
 1103                     (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1104                     !(newnp->n_flag & NMODIFIED)) {
 1105                         mtx_lock(&newnp->n_mtx);
 1106                         newnp->n_attrstamp = 0;
 1107                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1108                         mtx_unlock(&newnp->n_mtx);
 1109                 }
 1110                 if (nfscl_nodeleg(newvp, 0) == 0 ||
 1111                     ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
 1112                     VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
 1113                     timespeccmp(&vattr.va_ctime, &nctime, ==))) {
 1114                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1115                         if (cnp->cn_nameiop != LOOKUP &&
 1116                             (flags & ISLASTCN))
 1117                                 cnp->cn_flags |= SAVENAME;
 1118                         return (0);
 1119                 }
 1120                 cache_purge(newvp);
 1121                 if (dvp != newvp)
 1122                         vput(newvp);
 1123                 else 
 1124                         vrele(newvp);
 1125                 *vpp = NULLVP;
 1126         } else if (error == ENOENT) {
 1127                 if (dvp->v_iflag & VI_DOOMED)
 1128                         return (ENOENT);
 1129                 /*
 1130                  * We only accept a negative hit in the cache if the
 1131                  * modification time of the parent directory matches
 1132                  * the cached copy in the name cache entry.
 1133                  * Otherwise, we discard all of the negative cache
 1134                  * entries for this directory.  We also only trust
 1135                  * negative cache entries for up to nm_negnametimeo
 1136                  * seconds.
 1137                  */
 1138                 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
 1139                     VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
 1140                     timespeccmp(&vattr.va_mtime, &nctime, ==)) {
 1141                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1142                         return (ENOENT);
 1143                 }
 1144                 cache_purge_negative(dvp);
 1145         }
 1146 
 1147         error = 0;
 1148         newvp = NULLVP;
 1149         NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
 1150         error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1151             cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1152             NULL);
 1153         if (dattrflag)
 1154                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1155         if (error) {
 1156                 if (newvp != NULLVP) {
 1157                         vput(newvp);
 1158                         *vpp = NULLVP;
 1159                 }
 1160 
 1161                 if (error != ENOENT) {
 1162                         if (NFS_ISV4(dvp))
 1163                                 error = nfscl_maperr(td, error, (uid_t)0,
 1164                                     (gid_t)0);
 1165                         return (error);
 1166                 }
 1167 
 1168                 /* The requested file was not found. */
 1169                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 1170                     (flags & ISLASTCN)) {
 1171                         /*
 1172                          * XXX: UFS does a full VOP_ACCESS(dvp,
 1173                          * VWRITE) here instead of just checking
 1174                          * MNT_RDONLY.
 1175                          */
 1176                         if (mp->mnt_flag & MNT_RDONLY)
 1177                                 return (EROFS);
 1178                         cnp->cn_flags |= SAVENAME;
 1179                         return (EJUSTRETURN);
 1180                 }
 1181 
 1182                 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE &&
 1183                     dattrflag) {
 1184                         /*
 1185                          * Cache the modification time of the parent
 1186                          * directory from the post-op attributes in
 1187                          * the name cache entry.  The negative cache
 1188                          * entry will be ignored once the directory
 1189                          * has changed.  Don't bother adding the entry
 1190                          * if the directory has already changed.
 1191                          */
 1192                         mtx_lock(&np->n_mtx);
 1193                         if (timespeccmp(&np->n_vattr.na_mtime,
 1194                             &dnfsva.na_mtime, ==)) {
 1195                                 mtx_unlock(&np->n_mtx);
 1196                                 cache_enter_time(dvp, NULL, cnp,
 1197                                     &dnfsva.na_mtime, NULL);
 1198                         } else
 1199                                 mtx_unlock(&np->n_mtx);
 1200                 }
 1201                 return (ENOENT);
 1202         }
 1203 
 1204         /*
 1205          * Handle RENAME case...
 1206          */
 1207         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 1208                 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1209                         FREE((caddr_t)nfhp, M_NFSFH);
 1210                         return (EISDIR);
 1211                 }
 1212                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1213                     LK_EXCLUSIVE);
 1214                 if (error)
 1215                         return (error);
 1216                 newvp = NFSTOV(np);
 1217                 if (attrflag)
 1218                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1219                             0, 1);
 1220                 *vpp = newvp;
 1221                 cnp->cn_flags |= SAVENAME;
 1222                 return (0);
 1223         }
 1224 
 1225         if (flags & ISDOTDOT) {
 1226                 ltype = NFSVOPISLOCKED(dvp);
 1227                 error = vfs_busy(mp, MBF_NOWAIT);
 1228                 if (error != 0) {
 1229                         vfs_ref(mp);
 1230                         NFSVOPUNLOCK(dvp, 0);
 1231                         error = vfs_busy(mp, 0);
 1232                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1233                         vfs_rel(mp);
 1234                         if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
 1235                                 vfs_unbusy(mp);
 1236                                 error = ENOENT;
 1237                         }
 1238                         if (error != 0)
 1239                                 return (error);
 1240                 }
 1241                 NFSVOPUNLOCK(dvp, 0);
 1242                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1243                     cnp->cn_lkflags);
 1244                 if (error == 0)
 1245                         newvp = NFSTOV(np);
 1246                 vfs_unbusy(mp);
 1247                 if (newvp != dvp)
 1248                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1249                 if (dvp->v_iflag & VI_DOOMED) {
 1250                         if (error == 0) {
 1251                                 if (newvp == dvp)
 1252                                         vrele(newvp);
 1253                                 else
 1254                                         vput(newvp);
 1255                         }
 1256                         error = ENOENT;
 1257                 }
 1258                 if (error != 0)
 1259                         return (error);
 1260                 if (attrflag)
 1261                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1262                             0, 1);
 1263         } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1264                 FREE((caddr_t)nfhp, M_NFSFH);
 1265                 VREF(dvp);
 1266                 newvp = dvp;
 1267                 if (attrflag)
 1268                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1269                             0, 1);
 1270         } else {
 1271                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1272                     cnp->cn_lkflags);
 1273                 if (error)
 1274                         return (error);
 1275                 newvp = NFSTOV(np);
 1276                 if (attrflag)
 1277                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1278                             0, 1);
 1279                 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1280                     !(np->n_flag & NMODIFIED)) {                        
 1281                         /*
 1282                          * Flush the attribute cache when opening a
 1283                          * leaf node to ensure that fresh attributes
 1284                          * are fetched in nfs_open() since we did not
 1285                          * fetch attributes from the LOOKUP reply.
 1286                          */
 1287                         mtx_lock(&np->n_mtx);
 1288                         np->n_attrstamp = 0;
 1289                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1290                         mtx_unlock(&np->n_mtx);
 1291                 }
 1292         }
 1293         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1294                 cnp->cn_flags |= SAVENAME;
 1295         if ((cnp->cn_flags & MAKEENTRY) &&
 1296             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
 1297             attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
 1298                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1299                     newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
 1300         *vpp = newvp;
 1301         return (0);
 1302 }
 1303 
 1304 /*
 1305  * nfs read call.
 1306  * Just call ncl_bioread() to do the work.
 1307  */
 1308 static int
 1309 nfs_read(struct vop_read_args *ap)
 1310 {
 1311         struct vnode *vp = ap->a_vp;
 1312 
 1313         switch (vp->v_type) {
 1314         case VREG:
 1315                 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1316         case VDIR:
 1317                 return (EISDIR);
 1318         default:
 1319                 return (EOPNOTSUPP);
 1320         }
 1321 }
 1322 
 1323 /*
 1324  * nfs readlink call
 1325  */
 1326 static int
 1327 nfs_readlink(struct vop_readlink_args *ap)
 1328 {
 1329         struct vnode *vp = ap->a_vp;
 1330 
 1331         if (vp->v_type != VLNK)
 1332                 return (EINVAL);
 1333         return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1334 }
 1335 
 1336 /*
 1337  * Do a readlink rpc.
 1338  * Called by ncl_doio() from below the buffer cache.
 1339  */
 1340 int
 1341 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1342 {
 1343         int error, ret, attrflag;
 1344         struct nfsvattr nfsva;
 1345 
 1346         error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
 1347             &attrflag, NULL);
 1348         if (attrflag) {
 1349                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1350                 if (ret && !error)
 1351                         error = ret;
 1352         }
 1353         if (error && NFS_ISV4(vp))
 1354                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1355         return (error);
 1356 }
 1357 
 1358 /*
 1359  * nfs read rpc call
 1360  * Ditto above
 1361  */
 1362 int
 1363 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1364 {
 1365         int error, ret, attrflag;
 1366         struct nfsvattr nfsva;
 1367 
 1368         error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, &attrflag,
 1369             NULL);
 1370         if (attrflag) {
 1371                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1372                 if (ret && !error)
 1373                         error = ret;
 1374         }
 1375         if (error && NFS_ISV4(vp))
 1376                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1377         return (error);
 1378 }
 1379 
 1380 /*
 1381  * nfs write call
 1382  */
 1383 int
 1384 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1385     int *iomode, int *must_commit, int called_from_strategy)
 1386 {
 1387         struct nfsvattr nfsva;
 1388         int error = 0, attrflag, ret;
 1389 
 1390         error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
 1391             uiop->uio_td, &nfsva, &attrflag, NULL, called_from_strategy);
 1392         if (attrflag) {
 1393                 if (VTONFS(vp)->n_flag & ND_NFSV4)
 1394                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
 1395                             1);
 1396                 else
 1397                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 1398                             1);
 1399                 if (ret && !error)
 1400                         error = ret;
 1401         }
 1402         if (DOINGASYNC(vp))
 1403                 *iomode = NFSWRITE_FILESYNC;
 1404         if (error && NFS_ISV4(vp))
 1405                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1406         return (error);
 1407 }
 1408 
 1409 /*
 1410  * nfs mknod rpc
 1411  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1412  * mode set to specify the file type and the size field for rdev.
 1413  */
 1414 static int
 1415 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1416     struct vattr *vap)
 1417 {
 1418         struct nfsvattr nfsva, dnfsva;
 1419         struct vnode *newvp = NULL;
 1420         struct nfsnode *np = NULL, *dnp;
 1421         struct nfsfh *nfhp;
 1422         struct vattr vattr;
 1423         int error = 0, attrflag, dattrflag;
 1424         u_int32_t rdev;
 1425 
 1426         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1427                 rdev = vap->va_rdev;
 1428         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1429                 rdev = 0xffffffff;
 1430         else
 1431                 return (EOPNOTSUPP);
 1432         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1433                 return (error);
 1434         error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
 1435             rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 1436             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 1437         if (!error) {
 1438                 if (!nfhp)
 1439                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1440                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1441                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1442                             NULL);
 1443                 if (nfhp)
 1444                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1445                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1446         }
 1447         if (dattrflag)
 1448                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1449         if (!error) {
 1450                 newvp = NFSTOV(np);
 1451                 if (attrflag != 0) {
 1452                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1453                             0, 1);
 1454                         if (error != 0)
 1455                                 vput(newvp);
 1456                 }
 1457         }
 1458         if (!error) {
 1459                 *vpp = newvp;
 1460         } else if (NFS_ISV4(dvp)) {
 1461                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1462                     vap->va_gid);
 1463         }
 1464         dnp = VTONFS(dvp);
 1465         mtx_lock(&dnp->n_mtx);
 1466         dnp->n_flag |= NMODIFIED;
 1467         if (!dattrflag) {
 1468                 dnp->n_attrstamp = 0;
 1469                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1470         }
 1471         mtx_unlock(&dnp->n_mtx);
 1472         return (error);
 1473 }
 1474 
 1475 /*
 1476  * nfs mknod vop
 1477  * just call nfs_mknodrpc() to do the work.
 1478  */
 1479 /* ARGSUSED */
 1480 static int
 1481 nfs_mknod(struct vop_mknod_args *ap)
 1482 {
 1483         return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
 1484 }
 1485 
 1486 static struct mtx nfs_cverf_mtx;
 1487 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
 1488     MTX_DEF);
 1489 
 1490 static nfsquad_t
 1491 nfs_get_cverf(void)
 1492 {
 1493         static nfsquad_t cverf;
 1494         nfsquad_t ret;
 1495         static int cverf_initialized = 0;
 1496 
 1497         mtx_lock(&nfs_cverf_mtx);
 1498         if (cverf_initialized == 0) {
 1499                 cverf.lval[0] = arc4random();
 1500                 cverf.lval[1] = arc4random();
 1501                 cverf_initialized = 1;
 1502         } else
 1503                 cverf.qval++;
 1504         ret = cverf;
 1505         mtx_unlock(&nfs_cverf_mtx);
 1506 
 1507         return (ret);
 1508 }
 1509 
 1510 /*
 1511  * nfs file create call
 1512  */
 1513 static int
 1514 nfs_create(struct vop_create_args *ap)
 1515 {
 1516         struct vnode *dvp = ap->a_dvp;
 1517         struct vattr *vap = ap->a_vap;
 1518         struct componentname *cnp = ap->a_cnp;
 1519         struct nfsnode *np = NULL, *dnp;
 1520         struct vnode *newvp = NULL;
 1521         struct nfsmount *nmp;
 1522         struct nfsvattr dnfsva, nfsva;
 1523         struct nfsfh *nfhp;
 1524         nfsquad_t cverf;
 1525         int error = 0, attrflag, dattrflag, fmode = 0;
 1526         struct vattr vattr;
 1527 
 1528         /*
 1529          * Oops, not for me..
 1530          */
 1531         if (vap->va_type == VSOCK)
 1532                 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 1533 
 1534         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1535                 return (error);
 1536         if (vap->va_vaflags & VA_EXCLUSIVE)
 1537                 fmode |= O_EXCL;
 1538         dnp = VTONFS(dvp);
 1539         nmp = VFSTONFS(vnode_mount(dvp));
 1540 again:
 1541         /* For NFSv4, wait until any remove is done. */
 1542         mtx_lock(&dnp->n_mtx);
 1543         while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
 1544                 dnp->n_flag |= NREMOVEWANT;
 1545                 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
 1546         }
 1547         mtx_unlock(&dnp->n_mtx);
 1548 
 1549         cverf = nfs_get_cverf();
 1550         error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1551             vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
 1552             &nfhp, &attrflag, &dattrflag, NULL);
 1553         if (!error) {
 1554                 if (nfhp == NULL)
 1555                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1556                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1557                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1558                             NULL);
 1559                 if (nfhp != NULL)
 1560                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1561                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1562         }
 1563         if (dattrflag)
 1564                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1565         if (!error) {
 1566                 newvp = NFSTOV(np);
 1567                 if (attrflag == 0)
 1568                         error = nfsrpc_getattr(newvp, cnp->cn_cred,
 1569                             cnp->cn_thread, &nfsva, NULL);
 1570                 if (error == 0)
 1571                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1572                             0, 1);
 1573         }
 1574         if (error) {
 1575                 if (newvp != NULL) {
 1576                         vput(newvp);
 1577                         newvp = NULL;
 1578                 }
 1579                 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
 1580                     error == NFSERR_NOTSUPP) {
 1581                         fmode &= ~O_EXCL;
 1582                         goto again;
 1583                 }
 1584         } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
 1585                 if (nfscl_checksattr(vap, &nfsva)) {
 1586                         error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
 1587                             cnp->cn_thread, &nfsva, &attrflag, NULL);
 1588                         if (error && (vap->va_uid != (uid_t)VNOVAL ||
 1589                             vap->va_gid != (gid_t)VNOVAL)) {
 1590                                 /* try again without setting uid/gid */
 1591                                 vap->va_uid = (uid_t)VNOVAL;
 1592                                 vap->va_gid = (uid_t)VNOVAL;
 1593                                 error = nfsrpc_setattr(newvp, vap, NULL, 
 1594                                     cnp->cn_cred, cnp->cn_thread, &nfsva,
 1595                                     &attrflag, NULL);
 1596                         }
 1597                         if (attrflag)
 1598                                 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 1599                                     NULL, 0, 1);
 1600                         if (error != 0)
 1601                                 vput(newvp);
 1602                 }
 1603         }
 1604         if (!error) {
 1605                 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
 1606                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1607                             NULL);
 1608                 *ap->a_vpp = newvp;
 1609         } else if (NFS_ISV4(dvp)) {
 1610                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1611                     vap->va_gid);
 1612         }
 1613         mtx_lock(&dnp->n_mtx);
 1614         dnp->n_flag |= NMODIFIED;
 1615         if (!dattrflag) {
 1616                 dnp->n_attrstamp = 0;
 1617                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1618         }
 1619         mtx_unlock(&dnp->n_mtx);
 1620         return (error);
 1621 }
 1622 
 1623 /*
 1624  * nfs file remove call
 1625  * To try and make nfs semantics closer to ufs semantics, a file that has
 1626  * other processes using the vnode is renamed instead of removed and then
 1627  * removed later on the last close.
 1628  * - If v_usecount > 1
 1629  *        If a rename is not already in the works
 1630  *           call nfs_sillyrename() to set it up
 1631  *     else
 1632  *        do the remove rpc
 1633  */
 1634 static int
 1635 nfs_remove(struct vop_remove_args *ap)
 1636 {
 1637         struct vnode *vp = ap->a_vp;
 1638         struct vnode *dvp = ap->a_dvp;
 1639         struct componentname *cnp = ap->a_cnp;
 1640         struct nfsnode *np = VTONFS(vp);
 1641         int error = 0;
 1642         struct vattr vattr;
 1643 
 1644         KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
 1645         KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
 1646         if (vp->v_type == VDIR)
 1647                 error = EPERM;
 1648         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1649             VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
 1650             vattr.va_nlink > 1)) {
 1651                 /*
 1652                  * Purge the name cache so that the chance of a lookup for
 1653                  * the name succeeding while the remove is in progress is
 1654                  * minimized. Without node locking it can still happen, such
 1655                  * that an I/O op returns ESTALE, but since you get this if
 1656                  * another host removes the file..
 1657                  */
 1658                 cache_purge(vp);
 1659                 /*
 1660                  * throw away biocache buffers, mainly to avoid
 1661                  * unnecessary delayed writes later.
 1662                  */
 1663                 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1664                 /* Do the rpc */
 1665                 if (error != EINTR && error != EIO)
 1666                         error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
 1667                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1668                 /*
 1669                  * Kludge City: If the first reply to the remove rpc is lost..
 1670                  *   the reply to the retransmitted request will be ENOENT
 1671                  *   since the file was in fact removed
 1672                  *   Therefore, we cheat and return success.
 1673                  */
 1674                 if (error == ENOENT)
 1675                         error = 0;
 1676         } else if (!np->n_sillyrename)
 1677                 error = nfs_sillyrename(dvp, vp, cnp);
 1678         mtx_lock(&np->n_mtx);
 1679         np->n_attrstamp = 0;
 1680         mtx_unlock(&np->n_mtx);
 1681         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1682         return (error);
 1683 }
 1684 
 1685 /*
 1686  * nfs file remove rpc called from nfs_inactive
 1687  */
 1688 int
 1689 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
 1690 {
 1691         /*
 1692          * Make sure that the directory vnode is still valid.
 1693          * XXX we should lock sp->s_dvp here.
 1694          */
 1695         if (sp->s_dvp->v_type == VBAD)
 1696                 return (0);
 1697         return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
 1698             sp->s_cred, NULL));
 1699 }
 1700 
 1701 /*
 1702  * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
 1703  */
 1704 static int
 1705 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
 1706     int namelen, struct ucred *cred, struct thread *td)
 1707 {
 1708         struct nfsvattr dnfsva;
 1709         struct nfsnode *dnp = VTONFS(dvp);
 1710         int error = 0, dattrflag;
 1711 
 1712         mtx_lock(&dnp->n_mtx);
 1713         dnp->n_flag |= NREMOVEINPROG;
 1714         mtx_unlock(&dnp->n_mtx);
 1715         error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
 1716             &dattrflag, NULL);
 1717         mtx_lock(&dnp->n_mtx);
 1718         if ((dnp->n_flag & NREMOVEWANT)) {
 1719                 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
 1720                 mtx_unlock(&dnp->n_mtx);
 1721                 wakeup((caddr_t)dnp);
 1722         } else {
 1723                 dnp->n_flag &= ~NREMOVEINPROG;
 1724                 mtx_unlock(&dnp->n_mtx);
 1725         }
 1726         if (dattrflag)
 1727                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1728         mtx_lock(&dnp->n_mtx);
 1729         dnp->n_flag |= NMODIFIED;
 1730         if (!dattrflag) {
 1731                 dnp->n_attrstamp = 0;
 1732                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1733         }
 1734         mtx_unlock(&dnp->n_mtx);
 1735         if (error && NFS_ISV4(dvp))
 1736                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1737         return (error);
 1738 }
 1739 
 1740 /*
 1741  * nfs file rename call
 1742  */
 1743 static int
 1744 nfs_rename(struct vop_rename_args *ap)
 1745 {
 1746         struct vnode *fvp = ap->a_fvp;
 1747         struct vnode *tvp = ap->a_tvp;
 1748         struct vnode *fdvp = ap->a_fdvp;
 1749         struct vnode *tdvp = ap->a_tdvp;
 1750         struct componentname *tcnp = ap->a_tcnp;
 1751         struct componentname *fcnp = ap->a_fcnp;
 1752         struct nfsnode *fnp = VTONFS(ap->a_fvp);
 1753         struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
 1754         struct nfsv4node *newv4 = NULL;
 1755         int error;
 1756 
 1757         KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
 1758             (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
 1759         /* Check for cross-device rename */
 1760         if ((fvp->v_mount != tdvp->v_mount) ||
 1761             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1762                 error = EXDEV;
 1763                 goto out;
 1764         }
 1765 
 1766         if (fvp == tvp) {
 1767                 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n");
 1768                 error = 0;
 1769                 goto out;
 1770         }
 1771         if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
 1772                 goto out;
 1773 
 1774         /*
 1775          * We have to flush B_DELWRI data prior to renaming
 1776          * the file.  If we don't, the delayed-write buffers
 1777          * can be flushed out later after the file has gone stale
 1778          * under NFSV3.  NFSV2 does not have this problem because
 1779          * ( as far as I can tell ) it flushes dirty buffers more
 1780          * often.
 1781          * 
 1782          * Skip the rename operation if the fsync fails, this can happen
 1783          * due to the server's volume being full, when we pushed out data
 1784          * that was written back to our cache earlier. Not checking for
 1785          * this condition can result in potential (silent) data loss.
 1786          */
 1787         error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1788         NFSVOPUNLOCK(fvp, 0);
 1789         if (!error && tvp)
 1790                 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1791         if (error)
 1792                 goto out;
 1793 
 1794         /*
 1795          * If the tvp exists and is in use, sillyrename it before doing the
 1796          * rename of the new file over it.
 1797          * XXX Can't sillyrename a directory.
 1798          */
 1799         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1800                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1801                 vput(tvp);
 1802                 tvp = NULL;
 1803         }
 1804 
 1805         error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1806             tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1807             tcnp->cn_thread);
 1808 
 1809         if (error == 0 && NFS_ISV4(tdvp)) {
 1810                 /*
 1811                  * For NFSv4, check to see if it is the same name and
 1812                  * replace the name, if it is different.
 1813                  */
 1814                 MALLOC(newv4, struct nfsv4node *,
 1815                     sizeof (struct nfsv4node) +
 1816                     tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
 1817                     M_NFSV4NODE, M_WAITOK);
 1818                 mtx_lock(&tdnp->n_mtx);
 1819                 mtx_lock(&fnp->n_mtx);
 1820                 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
 1821                     (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
 1822                       NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
 1823                       tcnp->cn_namelen) ||
 1824                       tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
 1825                       NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1826                         tdnp->n_fhp->nfh_len))) {
 1827 #ifdef notdef
 1828 { char nnn[100]; int nnnl;
 1829 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
 1830 bcopy(tcnp->cn_nameptr, nnn, nnnl);
 1831 nnn[nnnl] = '\0';
 1832 printf("ren replace=%s\n",nnn);
 1833 }
 1834 #endif
 1835                         FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
 1836                         fnp->n_v4 = newv4;
 1837                         newv4 = NULL;
 1838                         fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
 1839                         fnp->n_v4->n4_namelen = tcnp->cn_namelen;
 1840                         NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1841                             tdnp->n_fhp->nfh_len);
 1842                         NFSBCOPY(tcnp->cn_nameptr,
 1843                             NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
 1844                 }
 1845                 mtx_unlock(&tdnp->n_mtx);
 1846                 mtx_unlock(&fnp->n_mtx);
 1847                 if (newv4 != NULL)
 1848                         FREE((caddr_t)newv4, M_NFSV4NODE);
 1849         }
 1850 
 1851         if (fvp->v_type == VDIR) {
 1852                 if (tvp != NULL && tvp->v_type == VDIR)
 1853                         cache_purge(tdvp);
 1854                 cache_purge(fdvp);
 1855         }
 1856 
 1857 out:
 1858         if (tdvp == tvp)
 1859                 vrele(tdvp);
 1860         else
 1861                 vput(tdvp);
 1862         if (tvp)
 1863                 vput(tvp);
 1864         vrele(fdvp);
 1865         vrele(fvp);
 1866         /*
 1867          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1868          */
 1869         if (error == ENOENT)
 1870                 error = 0;
 1871         return (error);
 1872 }
 1873 
 1874 /*
 1875  * nfs file rename rpc called from nfs_remove() above
 1876  */
 1877 static int
 1878 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
 1879     struct sillyrename *sp)
 1880 {
 1881 
 1882         return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
 1883             sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
 1884             scnp->cn_thread));
 1885 }
 1886 
 1887 /*
 1888  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 1889  */
 1890 static int
 1891 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
 1892     int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
 1893     int tnamelen, struct ucred *cred, struct thread *td)
 1894 {
 1895         struct nfsvattr fnfsva, tnfsva;
 1896         struct nfsnode *fdnp = VTONFS(fdvp);
 1897         struct nfsnode *tdnp = VTONFS(tdvp);
 1898         int error = 0, fattrflag, tattrflag;
 1899 
 1900         error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
 1901             tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
 1902             &tattrflag, NULL, NULL);
 1903         mtx_lock(&fdnp->n_mtx);
 1904         fdnp->n_flag |= NMODIFIED;
 1905         if (fattrflag != 0) {
 1906                 mtx_unlock(&fdnp->n_mtx);
 1907                 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
 1908         } else {
 1909                 fdnp->n_attrstamp = 0;
 1910                 mtx_unlock(&fdnp->n_mtx);
 1911                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
 1912         }
 1913         mtx_lock(&tdnp->n_mtx);
 1914         tdnp->n_flag |= NMODIFIED;
 1915         if (tattrflag != 0) {
 1916                 mtx_unlock(&tdnp->n_mtx);
 1917                 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
 1918         } else {
 1919                 tdnp->n_attrstamp = 0;
 1920                 mtx_unlock(&tdnp->n_mtx);
 1921                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 1922         }
 1923         if (error && NFS_ISV4(fdvp))
 1924                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1925         return (error);
 1926 }
 1927 
 1928 /*
 1929  * nfs hard link create call
 1930  */
 1931 static int
 1932 nfs_link(struct vop_link_args *ap)
 1933 {
 1934         struct vnode *vp = ap->a_vp;
 1935         struct vnode *tdvp = ap->a_tdvp;
 1936         struct componentname *cnp = ap->a_cnp;
 1937         struct nfsnode *np, *tdnp;
 1938         struct nfsvattr nfsva, dnfsva;
 1939         int error = 0, attrflag, dattrflag;
 1940 
 1941         if (vp->v_mount != tdvp->v_mount) {
 1942                 return (EXDEV);
 1943         }
 1944 
 1945         /*
 1946          * Push all writes to the server, so that the attribute cache
 1947          * doesn't get "out of sync" with the server.
 1948          * XXX There should be a better way!
 1949          */
 1950         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 1951 
 1952         error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
 1953             cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
 1954             &dattrflag, NULL);
 1955         tdnp = VTONFS(tdvp);
 1956         mtx_lock(&tdnp->n_mtx);
 1957         tdnp->n_flag |= NMODIFIED;
 1958         if (dattrflag != 0) {
 1959                 mtx_unlock(&tdnp->n_mtx);
 1960                 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
 1961         } else {
 1962                 tdnp->n_attrstamp = 0;
 1963                 mtx_unlock(&tdnp->n_mtx);
 1964                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 1965         }
 1966         if (attrflag)
 1967                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1968         else {
 1969                 np = VTONFS(vp);
 1970                 mtx_lock(&np->n_mtx);
 1971                 np->n_attrstamp = 0;
 1972                 mtx_unlock(&np->n_mtx);
 1973                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1974         }
 1975         /*
 1976          * If negative lookup caching is enabled, I might as well
 1977          * add an entry for this node. Not necessary for correctness,
 1978          * but if negative caching is enabled, then the system
 1979          * must care about lookup caching hit rate, so...
 1980          */
 1981         if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
 1982             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 1983                 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
 1984         }
 1985         if (error && NFS_ISV4(vp))
 1986                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 1987                     (gid_t)0);
 1988         return (error);
 1989 }
 1990 
 1991 /*
 1992  * nfs symbolic link create call
 1993  */
 1994 static int
 1995 nfs_symlink(struct vop_symlink_args *ap)
 1996 {
 1997         struct vnode *dvp = ap->a_dvp;
 1998         struct vattr *vap = ap->a_vap;
 1999         struct componentname *cnp = ap->a_cnp;
 2000         struct nfsvattr nfsva, dnfsva;
 2001         struct nfsfh *nfhp;
 2002         struct nfsnode *np = NULL, *dnp;
 2003         struct vnode *newvp = NULL;
 2004         int error = 0, attrflag, dattrflag, ret;
 2005 
 2006         vap->va_type = VLNK;
 2007         error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2008             ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 2009             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 2010         if (nfhp) {
 2011                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2012                     &np, NULL, LK_EXCLUSIVE);
 2013                 if (!ret)
 2014                         newvp = NFSTOV(np);
 2015                 else if (!error)
 2016                         error = ret;
 2017         }
 2018         if (newvp != NULL) {
 2019                 if (attrflag)
 2020                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2021                             0, 1);
 2022         } else if (!error) {
 2023                 /*
 2024                  * If we do not have an error and we could not extract the
 2025                  * newvp from the response due to the request being NFSv2, we
 2026                  * have to do a lookup in order to obtain a newvp to return.
 2027                  */
 2028                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2029                     cnp->cn_cred, cnp->cn_thread, &np);
 2030                 if (!error)
 2031                         newvp = NFSTOV(np);
 2032         }
 2033         if (error) {
 2034                 if (newvp)
 2035                         vput(newvp);
 2036                 if (NFS_ISV4(dvp))
 2037                         error = nfscl_maperr(cnp->cn_thread, error,
 2038                             vap->va_uid, vap->va_gid);
 2039         } else {
 2040                 *ap->a_vpp = newvp;
 2041         }
 2042 
 2043         dnp = VTONFS(dvp);
 2044         mtx_lock(&dnp->n_mtx);
 2045         dnp->n_flag |= NMODIFIED;
 2046         if (dattrflag != 0) {
 2047                 mtx_unlock(&dnp->n_mtx);
 2048                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2049         } else {
 2050                 dnp->n_attrstamp = 0;
 2051                 mtx_unlock(&dnp->n_mtx);
 2052                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2053         }
 2054         /*
 2055          * If negative lookup caching is enabled, I might as well
 2056          * add an entry for this node. Not necessary for correctness,
 2057          * but if negative caching is enabled, then the system
 2058          * must care about lookup caching hit rate, so...
 2059          */
 2060         if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2061             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 2062                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
 2063         }
 2064         return (error);
 2065 }
 2066 
 2067 /*
 2068  * nfs make dir call
 2069  */
 2070 static int
 2071 nfs_mkdir(struct vop_mkdir_args *ap)
 2072 {
 2073         struct vnode *dvp = ap->a_dvp;
 2074         struct vattr *vap = ap->a_vap;
 2075         struct componentname *cnp = ap->a_cnp;
 2076         struct nfsnode *np = NULL, *dnp;
 2077         struct vnode *newvp = NULL;
 2078         struct vattr vattr;
 2079         struct nfsfh *nfhp;
 2080         struct nfsvattr nfsva, dnfsva;
 2081         int error = 0, attrflag, dattrflag, ret;
 2082 
 2083         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
 2084                 return (error);
 2085         vap->va_type = VDIR;
 2086         error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2087             vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
 2088             &attrflag, &dattrflag, NULL);
 2089         dnp = VTONFS(dvp);
 2090         mtx_lock(&dnp->n_mtx);
 2091         dnp->n_flag |= NMODIFIED;
 2092         if (dattrflag != 0) {
 2093                 mtx_unlock(&dnp->n_mtx);
 2094                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2095         } else {
 2096                 dnp->n_attrstamp = 0;
 2097                 mtx_unlock(&dnp->n_mtx);
 2098                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2099         }
 2100         if (nfhp) {
 2101                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2102                     &np, NULL, LK_EXCLUSIVE);
 2103                 if (!ret) {
 2104                         newvp = NFSTOV(np);
 2105                         if (attrflag)
 2106                            (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 2107                                 NULL, 0, 1);
 2108                 } else if (!error)
 2109                         error = ret;
 2110         }
 2111         if (!error && newvp == NULL) {
 2112                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2113                     cnp->cn_cred, cnp->cn_thread, &np);
 2114                 if (!error) {
 2115                         newvp = NFSTOV(np);
 2116                         if (newvp->v_type != VDIR)
 2117                                 error = EEXIST;
 2118                 }
 2119         }
 2120         if (error) {
 2121                 if (newvp)
 2122                         vput(newvp);
 2123                 if (NFS_ISV4(dvp))
 2124                         error = nfscl_maperr(cnp->cn_thread, error,
 2125                             vap->va_uid, vap->va_gid);
 2126         } else {
 2127                 /*
 2128                  * If negative lookup caching is enabled, I might as well
 2129                  * add an entry for this node. Not necessary for correctness,
 2130                  * but if negative caching is enabled, then the system
 2131                  * must care about lookup caching hit rate, so...
 2132                  */
 2133                 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2134                     (cnp->cn_flags & MAKEENTRY) &&
 2135                     attrflag != 0 && dattrflag != 0)
 2136                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 2137                             &dnfsva.na_ctime);
 2138                 *ap->a_vpp = newvp;
 2139         }
 2140         return (error);
 2141 }
 2142 
 2143 /*
 2144  * nfs remove directory call
 2145  */
 2146 static int
 2147 nfs_rmdir(struct vop_rmdir_args *ap)
 2148 {
 2149         struct vnode *vp = ap->a_vp;
 2150         struct vnode *dvp = ap->a_dvp;
 2151         struct componentname *cnp = ap->a_cnp;
 2152         struct nfsnode *dnp;
 2153         struct nfsvattr dnfsva;
 2154         int error, dattrflag;
 2155 
 2156         if (dvp == vp)
 2157                 return (EINVAL);
 2158         error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2159             cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
 2160         dnp = VTONFS(dvp);
 2161         mtx_lock(&dnp->n_mtx);
 2162         dnp->n_flag |= NMODIFIED;
 2163         if (dattrflag != 0) {
 2164                 mtx_unlock(&dnp->n_mtx);
 2165                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2166         } else {
 2167                 dnp->n_attrstamp = 0;
 2168                 mtx_unlock(&dnp->n_mtx);
 2169                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2170         }
 2171 
 2172         cache_purge(dvp);
 2173         cache_purge(vp);
 2174         if (error && NFS_ISV4(dvp))
 2175                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2176                     (gid_t)0);
 2177         /*
 2178          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 2179          */
 2180         if (error == ENOENT)
 2181                 error = 0;
 2182         return (error);
 2183 }
 2184 
 2185 /*
 2186  * nfs readdir call
 2187  */
 2188 static int
 2189 nfs_readdir(struct vop_readdir_args *ap)
 2190 {
 2191         struct vnode *vp = ap->a_vp;
 2192         struct nfsnode *np = VTONFS(vp);
 2193         struct uio *uio = ap->a_uio;
 2194         ssize_t tresid, left;
 2195         int error = 0;
 2196         struct vattr vattr;
 2197         
 2198         if (ap->a_eofflag != NULL)
 2199                 *ap->a_eofflag = 0;
 2200         if (vp->v_type != VDIR) 
 2201                 return(EPERM);
 2202 
 2203         /*
 2204          * First, check for hit on the EOF offset cache
 2205          */
 2206         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 2207             (np->n_flag & NMODIFIED) == 0) {
 2208                 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
 2209                         mtx_lock(&np->n_mtx);
 2210                         if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
 2211                             !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 2212                                 mtx_unlock(&np->n_mtx);
 2213                                 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
 2214                                 if (ap->a_eofflag != NULL)
 2215                                         *ap->a_eofflag = 1;
 2216                                 return (0);
 2217                         } else
 2218                                 mtx_unlock(&np->n_mtx);
 2219                 }
 2220         }
 2221 
 2222         /*
 2223          * NFS always guarantees that directory entries don't straddle
 2224          * DIRBLKSIZ boundaries.  As such, we need to limit the size
 2225          * to an exact multiple of DIRBLKSIZ, to avoid copying a partial
 2226          * directory entry.
 2227          */
 2228         left = uio->uio_resid % DIRBLKSIZ;
 2229         if (left == uio->uio_resid)
 2230                 return (EINVAL);
 2231         uio->uio_resid -= left;
 2232 
 2233         /*
 2234          * Call ncl_bioread() to do the real work.
 2235          */
 2236         tresid = uio->uio_resid;
 2237         error = ncl_bioread(vp, uio, 0, ap->a_cred);
 2238 
 2239         if (!error && uio->uio_resid == tresid) {
 2240                 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
 2241                 if (ap->a_eofflag != NULL)
 2242                         *ap->a_eofflag = 1;
 2243         }
 2244         
 2245         /* Add the partial DIRBLKSIZ (left) back in. */
 2246         uio->uio_resid += left;
 2247         return (error);
 2248 }
 2249 
 2250 /*
 2251  * Readdir rpc call.
 2252  * Called from below the buffer cache by ncl_doio().
 2253  */
 2254 int
 2255 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2256     struct thread *td)
 2257 {
 2258         struct nfsvattr nfsva;
 2259         nfsuint64 *cookiep, cookie;
 2260         struct nfsnode *dnp = VTONFS(vp);
 2261         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2262         int error = 0, eof, attrflag;
 2263 
 2264         KASSERT(uiop->uio_iovcnt == 1 &&
 2265             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2266             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2267             ("nfs readdirrpc bad uio"));
 2268 
 2269         /*
 2270          * If there is no cookie, assume directory was stale.
 2271          */
 2272         ncl_dircookie_lock(dnp);
 2273         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2274         if (cookiep) {
 2275                 cookie = *cookiep;
 2276                 ncl_dircookie_unlock(dnp);
 2277         } else {
 2278                 ncl_dircookie_unlock(dnp);              
 2279                 return (NFSERR_BAD_COOKIE);
 2280         }
 2281 
 2282         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2283                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2284 
 2285         error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
 2286             &attrflag, &eof, NULL);
 2287         if (attrflag)
 2288                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2289 
 2290         if (!error) {
 2291                 /*
 2292                  * We are now either at the end of the directory or have filled
 2293                  * the block.
 2294                  */
 2295                 if (eof)
 2296                         dnp->n_direofoffset = uiop->uio_offset;
 2297                 else {
 2298                         if (uiop->uio_resid > 0)
 2299                                 ncl_printf("EEK! readdirrpc resid > 0\n");
 2300                         ncl_dircookie_lock(dnp);
 2301                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2302                         *cookiep = cookie;
 2303                         ncl_dircookie_unlock(dnp);
 2304                 }
 2305         } else if (NFS_ISV4(vp)) {
 2306                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2307         }
 2308         return (error);
 2309 }
 2310 
 2311 /*
 2312  * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
 2313  */
 2314 int
 2315 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2316     struct thread *td)
 2317 {
 2318         struct nfsvattr nfsva;
 2319         nfsuint64 *cookiep, cookie;
 2320         struct nfsnode *dnp = VTONFS(vp);
 2321         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2322         int error = 0, attrflag, eof;
 2323 
 2324         KASSERT(uiop->uio_iovcnt == 1 &&
 2325             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2326             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2327             ("nfs readdirplusrpc bad uio"));
 2328 
 2329         /*
 2330          * If there is no cookie, assume directory was stale.
 2331          */
 2332         ncl_dircookie_lock(dnp);
 2333         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2334         if (cookiep) {
 2335                 cookie = *cookiep;
 2336                 ncl_dircookie_unlock(dnp);
 2337         } else {
 2338                 ncl_dircookie_unlock(dnp);
 2339                 return (NFSERR_BAD_COOKIE);
 2340         }
 2341 
 2342         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2343                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2344         error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
 2345             &attrflag, &eof, NULL);
 2346         if (attrflag)
 2347                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2348 
 2349         if (!error) {
 2350                 /*
 2351                  * We are now either at end of the directory or have filled the
 2352                  * the block.
 2353                  */
 2354                 if (eof)
 2355                         dnp->n_direofoffset = uiop->uio_offset;
 2356                 else {
 2357                         if (uiop->uio_resid > 0)
 2358                                 ncl_printf("EEK! readdirplusrpc resid > 0\n");
 2359                         ncl_dircookie_lock(dnp);
 2360                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2361                         *cookiep = cookie;
 2362                         ncl_dircookie_unlock(dnp);
 2363                 }
 2364         } else if (NFS_ISV4(vp)) {
 2365                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2366         }
 2367         return (error);
 2368 }
 2369 
 2370 /*
 2371  * Silly rename. To make the NFS filesystem that is stateless look a little
 2372  * more like the "ufs" a remove of an active vnode is translated to a rename
 2373  * to a funny looking filename that is removed by nfs_inactive on the
 2374  * nfsnode. There is the potential for another process on a different client
 2375  * to create the same funny name between the nfs_lookitup() fails and the
 2376  * nfs_rename() completes, but...
 2377  */
 2378 static int
 2379 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2380 {
 2381         struct sillyrename *sp;
 2382         struct nfsnode *np;
 2383         int error;
 2384         short pid;
 2385         unsigned int lticks;
 2386 
 2387         cache_purge(dvp);
 2388         np = VTONFS(vp);
 2389         KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
 2390         MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
 2391             M_NEWNFSREQ, M_WAITOK);
 2392         sp->s_cred = crhold(cnp->cn_cred);
 2393         sp->s_dvp = dvp;
 2394         VREF(dvp);
 2395 
 2396         /* 
 2397          * Fudge together a funny name.
 2398          * Changing the format of the funny name to accomodate more 
 2399          * sillynames per directory.
 2400          * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 
 2401          * CPU ticks since boot.
 2402          */
 2403         pid = cnp->cn_thread->td_proc->p_pid;
 2404         lticks = (unsigned int)ticks;
 2405         for ( ; ; ) {
 2406                 sp->s_namlen = sprintf(sp->s_name, 
 2407                                        ".nfs.%08x.%04x4.4", lticks, 
 2408                                        pid);
 2409                 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2410                                  cnp->cn_thread, NULL))
 2411                         break;
 2412                 lticks++;
 2413         }
 2414         error = nfs_renameit(dvp, vp, cnp, sp);
 2415         if (error)
 2416                 goto bad;
 2417         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2418                 cnp->cn_thread, &np);
 2419         np->n_sillyrename = sp;
 2420         return (0);
 2421 bad:
 2422         vrele(sp->s_dvp);
 2423         crfree(sp->s_cred);
 2424         free((caddr_t)sp, M_NEWNFSREQ);
 2425         return (error);
 2426 }
 2427 
 2428 /*
 2429  * Look up a file name and optionally either update the file handle or
 2430  * allocate an nfsnode, depending on the value of npp.
 2431  * npp == NULL  --> just do the lookup
 2432  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2433  *                      handled too
 2434  * *npp != NULL --> update the file handle in the vnode
 2435  */
 2436 static int
 2437 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
 2438     struct thread *td, struct nfsnode **npp)
 2439 {
 2440         struct vnode *newvp = NULL, *vp;
 2441         struct nfsnode *np, *dnp = VTONFS(dvp);
 2442         struct nfsfh *nfhp, *onfhp;
 2443         struct nfsvattr nfsva, dnfsva;
 2444         struct componentname cn;
 2445         int error = 0, attrflag, dattrflag;
 2446         u_int hash;
 2447 
 2448         error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
 2449             &nfhp, &attrflag, &dattrflag, NULL);
 2450         if (dattrflag)
 2451                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2452         if (npp && !error) {
 2453                 if (*npp != NULL) {
 2454                     np = *npp;
 2455                     vp = NFSTOV(np);
 2456                     /*
 2457                      * For NFSv4, check to see if it is the same name and
 2458                      * replace the name, if it is different.
 2459                      */
 2460                     if (np->n_v4 != NULL && nfsva.na_type == VREG &&
 2461                         (np->n_v4->n4_namelen != len ||
 2462                          NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
 2463                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
 2464                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2465                          dnp->n_fhp->nfh_len))) {
 2466 #ifdef notdef
 2467 { char nnn[100]; int nnnl;
 2468 nnnl = (len < 100) ? len : 99;
 2469 bcopy(name, nnn, nnnl);
 2470 nnn[nnnl] = '\0';
 2471 printf("replace=%s\n",nnn);
 2472 }
 2473 #endif
 2474                             FREE((caddr_t)np->n_v4, M_NFSV4NODE);
 2475                             MALLOC(np->n_v4, struct nfsv4node *,
 2476                                 sizeof (struct nfsv4node) +
 2477                                 dnp->n_fhp->nfh_len + len - 1,
 2478                                 M_NFSV4NODE, M_WAITOK);
 2479                             np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
 2480                             np->n_v4->n4_namelen = len;
 2481                             NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2482                                 dnp->n_fhp->nfh_len);
 2483                             NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
 2484                     }
 2485                     hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
 2486                         FNV1_32_INIT);
 2487                     onfhp = np->n_fhp;
 2488                     /*
 2489                      * Rehash node for new file handle.
 2490                      */
 2491                     vfs_hash_rehash(vp, hash);
 2492                     np->n_fhp = nfhp;
 2493                     if (onfhp != NULL)
 2494                         FREE((caddr_t)onfhp, M_NFSFH);
 2495                     newvp = NFSTOV(np);
 2496                 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
 2497                     FREE((caddr_t)nfhp, M_NFSFH);
 2498                     VREF(dvp);
 2499                     newvp = dvp;
 2500                 } else {
 2501                     cn.cn_nameptr = name;
 2502                     cn.cn_namelen = len;
 2503                     error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
 2504                         &np, NULL, LK_EXCLUSIVE);
 2505                     if (error)
 2506                         return (error);
 2507                     newvp = NFSTOV(np);
 2508                 }
 2509                 if (!attrflag && *npp == NULL) {
 2510                         if (newvp == dvp)
 2511                                 vrele(newvp);
 2512                         else
 2513                                 vput(newvp);
 2514                         return (ENOENT);
 2515                 }
 2516                 if (attrflag)
 2517                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2518                             0, 1);
 2519         }
 2520         if (npp && *npp == NULL) {
 2521                 if (error) {
 2522                         if (newvp) {
 2523                                 if (newvp == dvp)
 2524                                         vrele(newvp);
 2525                                 else
 2526                                         vput(newvp);
 2527                         }
 2528                 } else
 2529                         *npp = np;
 2530         }
 2531         if (error && NFS_ISV4(dvp))
 2532                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2533         return (error);
 2534 }
 2535 
 2536 /*
 2537  * Nfs Version 3 and 4 commit rpc
 2538  */
 2539 int
 2540 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2541    struct thread *td)
 2542 {
 2543         struct nfsvattr nfsva;
 2544         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2545         int error, attrflag;
 2546         u_char verf[NFSX_VERF];
 2547 
 2548         mtx_lock(&nmp->nm_mtx);
 2549         if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
 2550                 mtx_unlock(&nmp->nm_mtx);
 2551                 return (0);
 2552         }
 2553         mtx_unlock(&nmp->nm_mtx);
 2554         error = nfsrpc_commit(vp, offset, cnt, cred, td, verf, &nfsva,
 2555             &attrflag, NULL);
 2556         if (!error) {
 2557                 mtx_lock(&nmp->nm_mtx);
 2558                 if (NFSBCMP((caddr_t)nmp->nm_verf, verf, NFSX_VERF)) {
 2559                         NFSBCOPY(verf, (caddr_t)nmp->nm_verf, NFSX_VERF);
 2560                         error = NFSERR_STALEWRITEVERF;
 2561                 }
 2562                 mtx_unlock(&nmp->nm_mtx);
 2563                 if (!error && attrflag)
 2564                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
 2565                             0, 1);
 2566         } else if (NFS_ISV4(vp)) {
 2567                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2568         }
 2569         return (error);
 2570 }
 2571 
 2572 /*
 2573  * Strategy routine.
 2574  * For async requests when nfsiod(s) are running, queue the request by
 2575  * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
 2576  * request.
 2577  */
 2578 static int
 2579 nfs_strategy(struct vop_strategy_args *ap)
 2580 {
 2581         struct buf *bp = ap->a_bp;
 2582         struct ucred *cr;
 2583 
 2584         KASSERT(!(bp->b_flags & B_DONE),
 2585             ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2586         BUF_ASSERT_HELD(bp);
 2587 
 2588         if (bp->b_iocmd == BIO_READ)
 2589                 cr = bp->b_rcred;
 2590         else
 2591                 cr = bp->b_wcred;
 2592 
 2593         /*
 2594          * If the op is asynchronous and an i/o daemon is waiting
 2595          * queue the request, wake it up and wait for completion
 2596          * otherwise just do it ourselves.
 2597          */
 2598         if ((bp->b_flags & B_ASYNC) == 0 ||
 2599             ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
 2600                 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
 2601         return (0);
 2602 }
 2603 
 2604 /*
 2605  * fsync vnode op. Just call ncl_flush() with commit == 1.
 2606  */
 2607 /* ARGSUSED */
 2608 static int
 2609 nfs_fsync(struct vop_fsync_args *ap)
 2610 {
 2611 
 2612         if (ap->a_vp->v_type != VREG) {
 2613                 /*
 2614                  * For NFS, metadata is changed synchronously on the server,
 2615                  * so there is nothing to flush. Also, ncl_flush() clears
 2616                  * the NMODIFIED flag and that shouldn't be done here for
 2617                  * directories.
 2618                  */
 2619                 return (0);
 2620         }
 2621         return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0));
 2622 }
 2623 
 2624 /*
 2625  * Flush all the blocks associated with a vnode.
 2626  *      Walk through the buffer pool and push any dirty pages
 2627  *      associated with the vnode.
 2628  * If the called_from_renewthread argument is TRUE, it has been called
 2629  * from the NFSv4 renew thread and, as such, cannot block indefinitely
 2630  * waiting for a buffer write to complete.
 2631  */
 2632 int
 2633 ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td,
 2634     int commit, int called_from_renewthread)
 2635 {
 2636         struct nfsnode *np = VTONFS(vp);
 2637         struct buf *bp;
 2638         int i;
 2639         struct buf *nbp;
 2640         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2641         int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2642         int passone = 1, trycnt = 0;
 2643         u_quad_t off, endoff, toff;
 2644         struct ucred* wcred = NULL;
 2645         struct buf **bvec = NULL;
 2646         struct bufobj *bo;
 2647 #ifndef NFS_COMMITBVECSIZ
 2648 #define NFS_COMMITBVECSIZ       20
 2649 #endif
 2650         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2651         int bvecsize = 0, bveccount;
 2652 
 2653         if (called_from_renewthread != 0)
 2654                 slptimeo = hz;
 2655         if (nmp->nm_flag & NFSMNT_INT)
 2656                 slpflag = NFS_PCATCH;
 2657         if (!commit)
 2658                 passone = 0;
 2659         bo = &vp->v_bufobj;
 2660         /*
 2661          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2662          * server, but has not been committed to stable storage on the server
 2663          * yet. On the first pass, the byte range is worked out and the commit
 2664          * rpc is done. On the second pass, ncl_writebp() is called to do the
 2665          * job.
 2666          */
 2667 again:
 2668         off = (u_quad_t)-1;
 2669         endoff = 0;
 2670         bvecpos = 0;
 2671         if (NFS_ISV34(vp) && commit) {
 2672                 if (bvec != NULL && bvec != bvec_on_stack)
 2673                         free(bvec, M_TEMP);
 2674                 /*
 2675                  * Count up how many buffers waiting for a commit.
 2676                  */
 2677                 bveccount = 0;
 2678                 BO_LOCK(bo);
 2679                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2680                         if (!BUF_ISLOCKED(bp) &&
 2681                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2682                                 == (B_DELWRI | B_NEEDCOMMIT))
 2683                                 bveccount++;
 2684                 }
 2685                 /*
 2686                  * Allocate space to remember the list of bufs to commit.  It is
 2687                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 2688                  * If we can't get memory (for whatever reason), we will end up
 2689                  * committing the buffers one-by-one in the loop below.
 2690                  */
 2691                 if (bveccount > NFS_COMMITBVECSIZ) {
 2692                         /*
 2693                          * Release the vnode interlock to avoid a lock
 2694                          * order reversal.
 2695                          */
 2696                         BO_UNLOCK(bo);
 2697                         bvec = (struct buf **)
 2698                                 malloc(bveccount * sizeof(struct buf *),
 2699                                        M_TEMP, M_NOWAIT);
 2700                         BO_LOCK(bo);
 2701                         if (bvec == NULL) {
 2702                                 bvec = bvec_on_stack;
 2703                                 bvecsize = NFS_COMMITBVECSIZ;
 2704                         } else
 2705                                 bvecsize = bveccount;
 2706                 } else {
 2707                         bvec = bvec_on_stack;
 2708                         bvecsize = NFS_COMMITBVECSIZ;
 2709                 }
 2710                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2711                         if (bvecpos >= bvecsize)
 2712                                 break;
 2713                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2714                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2715                                 continue;
 2716                         }
 2717                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2718                             (B_DELWRI | B_NEEDCOMMIT)) {
 2719                                 BUF_UNLOCK(bp);
 2720                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2721                                 continue;
 2722                         }
 2723                         BO_UNLOCK(bo);
 2724                         bremfree(bp);
 2725                         /*
 2726                          * Work out if all buffers are using the same cred
 2727                          * so we can deal with them all with one commit.
 2728                          *
 2729                          * NOTE: we are not clearing B_DONE here, so we have
 2730                          * to do it later on in this routine if we intend to
 2731                          * initiate I/O on the bp.
 2732                          *
 2733                          * Note: to avoid loopback deadlocks, we do not
 2734                          * assign b_runningbufspace.
 2735                          */
 2736                         if (wcred == NULL)
 2737                                 wcred = bp->b_wcred;
 2738                         else if (wcred != bp->b_wcred)
 2739                                 wcred = NOCRED;
 2740                         vfs_busy_pages(bp, 1);
 2741 
 2742                         BO_LOCK(bo);
 2743                         /*
 2744                          * bp is protected by being locked, but nbp is not
 2745                          * and vfs_busy_pages() may sleep.  We have to
 2746                          * recalculate nbp.
 2747                          */
 2748                         nbp = TAILQ_NEXT(bp, b_bobufs);
 2749 
 2750                         /*
 2751                          * A list of these buffers is kept so that the
 2752                          * second loop knows which buffers have actually
 2753                          * been committed. This is necessary, since there
 2754                          * may be a race between the commit rpc and new
 2755                          * uncommitted writes on the file.
 2756                          */
 2757                         bvec[bvecpos++] = bp;
 2758                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2759                                 bp->b_dirtyoff;
 2760                         if (toff < off)
 2761                                 off = toff;
 2762                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2763                         if (toff > endoff)
 2764                                 endoff = toff;
 2765                 }
 2766                 BO_UNLOCK(bo);
 2767         }
 2768         if (bvecpos > 0) {
 2769                 /*
 2770                  * Commit data on the server, as required.
 2771                  * If all bufs are using the same wcred, then use that with
 2772                  * one call for all of them, otherwise commit each one
 2773                  * separately.
 2774                  */
 2775                 if (wcred != NOCRED)
 2776                         retv = ncl_commit(vp, off, (int)(endoff - off),
 2777                                           wcred, td);
 2778                 else {
 2779                         retv = 0;
 2780                         for (i = 0; i < bvecpos; i++) {
 2781                                 off_t off, size;
 2782                                 bp = bvec[i];
 2783                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2784                                         bp->b_dirtyoff;
 2785                                 size = (u_quad_t)(bp->b_dirtyend
 2786                                                   - bp->b_dirtyoff);
 2787                                 retv = ncl_commit(vp, off, (int)size,
 2788                                                   bp->b_wcred, td);
 2789                                 if (retv) break;
 2790                         }
 2791                 }
 2792 
 2793                 if (retv == NFSERR_STALEWRITEVERF)
 2794                         ncl_clearcommit(vp->v_mount);
 2795 
 2796                 /*
 2797                  * Now, either mark the blocks I/O done or mark the
 2798                  * blocks dirty, depending on whether the commit
 2799                  * succeeded.
 2800                  */
 2801                 for (i = 0; i < bvecpos; i++) {
 2802                         bp = bvec[i];
 2803                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 2804                         if (retv) {
 2805                                 /*
 2806                                  * Error, leave B_DELWRI intact
 2807                                  */
 2808                                 vfs_unbusy_pages(bp);
 2809                                 brelse(bp);
 2810                         } else {
 2811                                 /*
 2812                                  * Success, remove B_DELWRI ( bundirty() ).
 2813                                  *
 2814                                  * b_dirtyoff/b_dirtyend seem to be NFS
 2815                                  * specific.  We should probably move that
 2816                                  * into bundirty(). XXX
 2817                                  */
 2818                                 bufobj_wref(bo);
 2819                                 bp->b_flags |= B_ASYNC;
 2820                                 bundirty(bp);
 2821                                 bp->b_flags &= ~B_DONE;
 2822                                 bp->b_ioflags &= ~BIO_ERROR;
 2823                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2824                                 bufdone(bp);
 2825                         }
 2826                 }
 2827         }
 2828 
 2829         /*
 2830          * Start/do any write(s) that are required.
 2831          */
 2832 loop:
 2833         BO_LOCK(bo);
 2834         TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2835                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2836                         if (waitfor != MNT_WAIT || passone)
 2837                                 continue;
 2838 
 2839                         error = BUF_TIMELOCK(bp,
 2840                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 2841                             BO_MTX(bo), "nfsfsync", slpflag, slptimeo);
 2842                         if (error == 0) {
 2843                                 BUF_UNLOCK(bp);
 2844                                 goto loop;
 2845                         }
 2846                         if (error == ENOLCK) {
 2847                                 error = 0;
 2848                                 goto loop;
 2849                         }
 2850                         if (called_from_renewthread != 0) {
 2851                                 /*
 2852                                  * Return EIO so the flush will be retried
 2853                                  * later.
 2854                                  */
 2855                                 error = EIO;
 2856                                 goto done;
 2857                         }
 2858                         if (newnfs_sigintr(nmp, td)) {
 2859                                 error = EINTR;
 2860                                 goto done;
 2861                         }
 2862                         if (slpflag & PCATCH) {
 2863                                 slpflag = 0;
 2864                                 slptimeo = 2 * hz;
 2865                         }
 2866                         goto loop;
 2867                 }
 2868                 if ((bp->b_flags & B_DELWRI) == 0)
 2869                         panic("nfs_fsync: not dirty");
 2870                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 2871                         BUF_UNLOCK(bp);
 2872                         continue;
 2873                 }
 2874                 BO_UNLOCK(bo);
 2875                 bremfree(bp);
 2876                 if (passone || !commit)
 2877                     bp->b_flags |= B_ASYNC;
 2878                 else
 2879                     bp->b_flags |= B_ASYNC;
 2880                 bwrite(bp);
 2881                 if (newnfs_sigintr(nmp, td)) {
 2882                         error = EINTR;
 2883                         goto done;
 2884                 }
 2885                 goto loop;
 2886         }
 2887         if (passone) {
 2888                 passone = 0;
 2889                 BO_UNLOCK(bo);
 2890                 goto again;
 2891         }
 2892         if (waitfor == MNT_WAIT) {
 2893                 while (bo->bo_numoutput) {
 2894                         error = bufobj_wwait(bo, slpflag, slptimeo);
 2895                         if (error) {
 2896                             BO_UNLOCK(bo);
 2897                             if (called_from_renewthread != 0) {
 2898                                 /*
 2899                                  * Return EIO so that the flush will be
 2900                                  * retried later.
 2901                                  */
 2902                                 error = EIO;
 2903                                 goto done;
 2904                             }
 2905                             error = newnfs_sigintr(nmp, td);
 2906                             if (error)
 2907                                 goto done;
 2908                             if (slpflag & PCATCH) {
 2909                                 slpflag = 0;
 2910                                 slptimeo = 2 * hz;
 2911                             }
 2912                             BO_LOCK(bo);
 2913                         }
 2914                 }
 2915                 if (bo->bo_dirty.bv_cnt != 0 && commit) {
 2916                         BO_UNLOCK(bo);
 2917                         goto loop;
 2918                 }
 2919                 /*
 2920                  * Wait for all the async IO requests to drain
 2921                  */
 2922                 BO_UNLOCK(bo);
 2923                 mtx_lock(&np->n_mtx);
 2924                 while (np->n_directio_asyncwr > 0) {
 2925                         np->n_flag |= NFSYNCWAIT;
 2926                         error = newnfs_msleep(td, &np->n_directio_asyncwr,
 2927                             &np->n_mtx, slpflag | (PRIBIO + 1), 
 2928                             "nfsfsync", 0);
 2929                         if (error) {
 2930                                 if (newnfs_sigintr(nmp, td)) {
 2931                                         mtx_unlock(&np->n_mtx);
 2932                                         error = EINTR;  
 2933                                         goto done;
 2934                                 }
 2935                         }
 2936                 }
 2937                 mtx_unlock(&np->n_mtx);
 2938         } else
 2939                 BO_UNLOCK(bo);
 2940         mtx_lock(&np->n_mtx);
 2941         if (np->n_flag & NWRITEERR) {
 2942                 error = np->n_error;
 2943                 np->n_flag &= ~NWRITEERR;
 2944         }
 2945         if (commit && bo->bo_dirty.bv_cnt == 0 &&
 2946             bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
 2947                 np->n_flag &= ~NMODIFIED;
 2948         mtx_unlock(&np->n_mtx);
 2949 done:
 2950         if (bvec != NULL && bvec != bvec_on_stack)
 2951                 free(bvec, M_TEMP);
 2952         if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
 2953             (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
 2954              np->n_directio_asyncwr != 0) && trycnt++ < 5) {
 2955                 /* try, try again... */
 2956                 passone = 1;
 2957                 wcred = NULL;
 2958                 bvec = NULL;
 2959                 bvecsize = 0;
 2960 printf("try%d\n", trycnt);
 2961                 goto again;
 2962         }
 2963         return (error);
 2964 }
 2965 
 2966 /*
 2967  * NFS advisory byte-level locks.
 2968  */
 2969 static int
 2970 nfs_advlock(struct vop_advlock_args *ap)
 2971 {
 2972         struct vnode *vp = ap->a_vp;
 2973         struct ucred *cred;
 2974         struct nfsnode *np = VTONFS(ap->a_vp);
 2975         struct proc *p = (struct proc *)ap->a_id;
 2976         struct thread *td = curthread;  /* XXX */
 2977         struct vattr va;
 2978         int ret, error = EOPNOTSUPP;
 2979         u_quad_t size;
 2980         
 2981         if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
 2982                 if (vp->v_type != VREG)
 2983                         return (EINVAL);
 2984                 if ((ap->a_flags & F_POSIX) != 0)
 2985                         cred = p->p_ucred;
 2986                 else
 2987                         cred = td->td_ucred;
 2988                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 2989                 if (vp->v_iflag & VI_DOOMED) {
 2990                         NFSVOPUNLOCK(vp, 0);
 2991                         return (EBADF);
 2992                 }
 2993 
 2994                 /*
 2995                  * If this is unlocking a write locked region, flush and
 2996                  * commit them before unlocking. This is required by
 2997                  * RFC3530 Sec. 9.3.2.
 2998                  */
 2999                 if (ap->a_op == F_UNLCK &&
 3000                     nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
 3001                     ap->a_flags))
 3002                         (void) ncl_flush(vp, MNT_WAIT, cred, td, 1, 0);
 3003 
 3004                 /*
 3005                  * Loop around doing the lock op, while a blocking lock
 3006                  * must wait for the lock op to succeed.
 3007                  */
 3008                 do {
 3009                         ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
 3010                             ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
 3011                         if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3012                             ap->a_op == F_SETLK) {
 3013                                 NFSVOPUNLOCK(vp, 0);
 3014                                 error = nfs_catnap(PZERO | PCATCH, ret,
 3015                                     "ncladvl");
 3016                                 if (error)
 3017                                         return (EINTR);
 3018                                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 3019                                 if (vp->v_iflag & VI_DOOMED) {
 3020                                         NFSVOPUNLOCK(vp, 0);
 3021                                         return (EBADF);
 3022                                 }
 3023                         }
 3024                 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3025                      ap->a_op == F_SETLK);
 3026                 if (ret == NFSERR_DENIED) {
 3027                         NFSVOPUNLOCK(vp, 0);
 3028                         return (EAGAIN);
 3029                 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
 3030                         NFSVOPUNLOCK(vp, 0);
 3031                         return (ret);
 3032                 } else if (ret != 0) {
 3033                         NFSVOPUNLOCK(vp, 0);
 3034                         return (EACCES);
 3035                 }
 3036 
 3037                 /*
 3038                  * Now, if we just got a lock, invalidate data in the buffer
 3039                  * cache, as required, so that the coherency conforms with
 3040                  * RFC3530 Sec. 9.3.2.
 3041                  */
 3042                 if (ap->a_op == F_SETLK) {
 3043                         if ((np->n_flag & NMODIFIED) == 0) {
 3044                                 np->n_attrstamp = 0;
 3045                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3046                                 ret = VOP_GETATTR(vp, &va, cred);
 3047                         }
 3048                         if ((np->n_flag & NMODIFIED) || ret ||
 3049                             np->n_change != va.va_filerev) {
 3050                                 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
 3051                                 np->n_attrstamp = 0;
 3052                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3053                                 ret = VOP_GETATTR(vp, &va, cred);
 3054                                 if (!ret) {
 3055                                         np->n_mtime = va.va_mtime;
 3056                                         np->n_change = va.va_filerev;
 3057                                 }
 3058                         }
 3059                         /* Mark that a file lock has been acquired. */
 3060                         mtx_lock(&np->n_mtx);
 3061                         np->n_flag |= NHASBEENLOCKED;
 3062                         mtx_unlock(&np->n_mtx);
 3063                 }
 3064                 NFSVOPUNLOCK(vp, 0);
 3065                 return (0);
 3066         } else if (!NFS_ISV4(vp)) {
 3067                 error = NFSVOPLOCK(vp, LK_SHARED);
 3068                 if (error)
 3069                         return (error);
 3070                 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3071                         size = VTONFS(vp)->n_size;
 3072                         NFSVOPUNLOCK(vp, 0);
 3073                         error = lf_advlock(ap, &(vp->v_lockf), size);
 3074                 } else {
 3075                         if (nfs_advlock_p != NULL)
 3076                                 error = nfs_advlock_p(ap);
 3077                         else {
 3078                                 NFSVOPUNLOCK(vp, 0);
 3079                                 error = ENOLCK;
 3080                         }
 3081                 }
 3082                 if (error == 0 && ap->a_op == F_SETLK) {
 3083                         /* Mark that a file lock has been acquired. */
 3084                         mtx_lock(&np->n_mtx);
 3085                         np->n_flag |= NHASBEENLOCKED;
 3086                         mtx_unlock(&np->n_mtx);
 3087                 }
 3088         }
 3089         return (error);
 3090 }
 3091 
 3092 /*
 3093  * NFS advisory byte-level locks.
 3094  */
 3095 static int
 3096 nfs_advlockasync(struct vop_advlockasync_args *ap)
 3097 {
 3098         struct vnode *vp = ap->a_vp;
 3099         u_quad_t size;
 3100         int error;
 3101         
 3102         if (NFS_ISV4(vp))
 3103                 return (EOPNOTSUPP);
 3104         error = NFSVOPLOCK(vp, LK_SHARED);
 3105         if (error)
 3106                 return (error);
 3107         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3108                 size = VTONFS(vp)->n_size;
 3109                 NFSVOPUNLOCK(vp, 0);
 3110                 error = lf_advlockasync(ap, &(vp->v_lockf), size);
 3111         } else {
 3112                 NFSVOPUNLOCK(vp, 0);
 3113                 error = EOPNOTSUPP;
 3114         }
 3115         return (error);
 3116 }
 3117 
 3118 /*
 3119  * Print out the contents of an nfsnode.
 3120  */
 3121 static int
 3122 nfs_print(struct vop_print_args *ap)
 3123 {
 3124         struct vnode *vp = ap->a_vp;
 3125         struct nfsnode *np = VTONFS(vp);
 3126 
 3127         ncl_printf("\tfileid %ld fsid 0x%x",
 3128            np->n_vattr.na_fileid, np->n_vattr.na_fsid);
 3129         if (vp->v_type == VFIFO)
 3130                 fifo_printinfo(vp);
 3131         printf("\n");
 3132         return (0);
 3133 }
 3134 
 3135 /*
 3136  * This is the "real" nfs::bwrite(struct buf*).
 3137  * We set B_CACHE if this is a VMIO buffer.
 3138  */
 3139 int
 3140 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
 3141 {
 3142         int s;
 3143         int oldflags = bp->b_flags;
 3144 #if 0
 3145         int retv = 1;
 3146         off_t off;
 3147 #endif
 3148 
 3149         BUF_ASSERT_HELD(bp);
 3150 
 3151         if (bp->b_flags & B_INVAL) {
 3152                 brelse(bp);
 3153                 return(0);
 3154         }
 3155 
 3156         bp->b_flags |= B_CACHE;
 3157 
 3158         /*
 3159          * Undirty the bp.  We will redirty it later if the I/O fails.
 3160          */
 3161 
 3162         s = splbio();
 3163         bundirty(bp);
 3164         bp->b_flags &= ~B_DONE;
 3165         bp->b_ioflags &= ~BIO_ERROR;
 3166         bp->b_iocmd = BIO_WRITE;
 3167 
 3168         bufobj_wref(bp->b_bufobj);
 3169         curthread->td_ru.ru_oublock++;
 3170         splx(s);
 3171 
 3172         /*
 3173          * Note: to avoid loopback deadlocks, we do not
 3174          * assign b_runningbufspace.
 3175          */
 3176         vfs_busy_pages(bp, 1);
 3177 
 3178         BUF_KERNPROC(bp);
 3179         bp->b_iooffset = dbtob(bp->b_blkno);
 3180         bstrategy(bp);
 3181 
 3182         if( (oldflags & B_ASYNC) == 0) {
 3183                 int rtval = bufwait(bp);
 3184 
 3185                 if (oldflags & B_DELWRI) {
 3186                         s = splbio();
 3187                         reassignbuf(bp);
 3188                         splx(s);
 3189                 }
 3190                 brelse(bp);
 3191                 return (rtval);
 3192         }
 3193 
 3194         return (0);
 3195 }
 3196 
 3197 /*
 3198  * nfs special file access vnode op.
 3199  * Essentially just get vattr and then imitate iaccess() since the device is
 3200  * local to the client.
 3201  */
 3202 static int
 3203 nfsspec_access(struct vop_access_args *ap)
 3204 {
 3205         struct vattr *vap;
 3206         struct ucred *cred = ap->a_cred;
 3207         struct vnode *vp = ap->a_vp;
 3208         accmode_t accmode = ap->a_accmode;
 3209         struct vattr vattr;
 3210         int error;
 3211 
 3212         /*
 3213          * Disallow write attempts on filesystems mounted read-only;
 3214          * unless the file is a socket, fifo, or a block or character
 3215          * device resident on the filesystem.
 3216          */
 3217         if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3218                 switch (vp->v_type) {
 3219                 case VREG:
 3220                 case VDIR:
 3221                 case VLNK:
 3222                         return (EROFS);
 3223                 default:
 3224                         break;
 3225                 }
 3226         }
 3227         vap = &vattr;
 3228         error = VOP_GETATTR(vp, vap, cred);
 3229         if (error)
 3230                 goto out;
 3231         error  = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
 3232             accmode, cred, NULL);
 3233 out:
 3234         return error;
 3235 }
 3236 
 3237 /*
 3238  * Read wrapper for fifos.
 3239  */
 3240 static int
 3241 nfsfifo_read(struct vop_read_args *ap)
 3242 {
 3243         struct nfsnode *np = VTONFS(ap->a_vp);
 3244         int error;
 3245 
 3246         /*
 3247          * Set access flag.
 3248          */
 3249         mtx_lock(&np->n_mtx);
 3250         np->n_flag |= NACC;
 3251         vfs_timestamp(&np->n_atim);
 3252         mtx_unlock(&np->n_mtx);
 3253         error = fifo_specops.vop_read(ap);
 3254         return error;   
 3255 }
 3256 
 3257 /*
 3258  * Write wrapper for fifos.
 3259  */
 3260 static int
 3261 nfsfifo_write(struct vop_write_args *ap)
 3262 {
 3263         struct nfsnode *np = VTONFS(ap->a_vp);
 3264 
 3265         /*
 3266          * Set update flag.
 3267          */
 3268         mtx_lock(&np->n_mtx);
 3269         np->n_flag |= NUPD;
 3270         vfs_timestamp(&np->n_mtim);
 3271         mtx_unlock(&np->n_mtx);
 3272         return(fifo_specops.vop_write(ap));
 3273 }
 3274 
 3275 /*
 3276  * Close wrapper for fifos.
 3277  *
 3278  * Update the times on the nfsnode then do fifo close.
 3279  */
 3280 static int
 3281 nfsfifo_close(struct vop_close_args *ap)
 3282 {
 3283         struct vnode *vp = ap->a_vp;
 3284         struct nfsnode *np = VTONFS(vp);
 3285         struct vattr vattr;
 3286         struct timespec ts;
 3287 
 3288         mtx_lock(&np->n_mtx);
 3289         if (np->n_flag & (NACC | NUPD)) {
 3290                 vfs_timestamp(&ts);
 3291                 if (np->n_flag & NACC)
 3292                         np->n_atim = ts;
 3293                 if (np->n_flag & NUPD)
 3294                         np->n_mtim = ts;
 3295                 np->n_flag |= NCHG;
 3296                 if (vrefcnt(vp) == 1 &&
 3297                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3298                         VATTR_NULL(&vattr);
 3299                         if (np->n_flag & NACC)
 3300                                 vattr.va_atime = np->n_atim;
 3301                         if (np->n_flag & NUPD)
 3302                                 vattr.va_mtime = np->n_mtim;
 3303                         mtx_unlock(&np->n_mtx);
 3304                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 3305                         goto out;
 3306                 }
 3307         }
 3308         mtx_unlock(&np->n_mtx);
 3309 out:
 3310         return (fifo_specops.vop_close(ap));
 3311 }
 3312 
 3313 /*
 3314  * Just call ncl_writebp() with the force argument set to 1.
 3315  *
 3316  * NOTE: B_DONE may or may not be set in a_bp on call.
 3317  */
 3318 static int
 3319 nfs_bwrite(struct buf *bp)
 3320 {
 3321 
 3322         return (ncl_writebp(bp, 1, curthread));
 3323 }
 3324 
 3325 struct buf_ops buf_ops_newnfs = {
 3326         .bop_name       =       "buf_ops_nfs",
 3327         .bop_write      =       nfs_bwrite,
 3328         .bop_strategy   =       bufstrategy,
 3329         .bop_sync       =       bufsync,
 3330         .bop_bdflush    =       bufbdflush,
 3331 };
 3332 
 3333 /*
 3334  * Cloned from vop_stdlock(), and then the ugly hack added.
 3335  */
 3336 static int
 3337 nfs_lock1(struct vop_lock1_args *ap)
 3338 {
 3339         struct vnode *vp = ap->a_vp;
 3340         int error = 0;
 3341 
 3342         /*
 3343          * Since vfs_hash_get() calls vget() and it will no longer work
 3344          * for FreeBSD8 with flags == 0, I can only think of this horrible
 3345          * hack to work around it. I call vfs_hash_get() with LK_EXCLOTHER
 3346          * and then handle it here. All I want for this case is a v_usecount
 3347          * on the vnode to use for recovery, while another thread might
 3348          * hold a lock on the vnode. I have the other threads blocked, so
 3349          * there isn't any race problem.
 3350          */
 3351         if ((ap->a_flags & LK_TYPE_MASK) == LK_EXCLOTHER) {
 3352                 if ((ap->a_flags & LK_INTERLOCK) == 0)
 3353                         panic("ncllock1");
 3354                 if ((vp->v_iflag & VI_DOOMED))
 3355                         error = ENOENT;
 3356                 VI_UNLOCK(vp);
 3357                 return (error);
 3358         }
 3359         return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
 3360             LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
 3361             ap->a_line));
 3362 }
 3363 
 3364 static int
 3365 nfs_getacl(struct vop_getacl_args *ap)
 3366 {
 3367         int error;
 3368 
 3369         if (ap->a_type != ACL_TYPE_NFS4)
 3370                 return (EOPNOTSUPP);
 3371         error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3372             NULL);
 3373         if (error > NFSERR_STALE) {
 3374                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3375                 error = EPERM;
 3376         }
 3377         return (error);
 3378 }
 3379 
 3380 static int
 3381 nfs_setacl(struct vop_setacl_args *ap)
 3382 {
 3383         int error;
 3384 
 3385         if (ap->a_type != ACL_TYPE_NFS4)
 3386                 return (EOPNOTSUPP);
 3387         error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3388             NULL);
 3389         if (error > NFSERR_STALE) {
 3390                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3391                 error = EPERM;
 3392         }
 3393         return (error);
 3394 }
 3395 
 3396 /*
 3397  * Return POSIX pathconf information applicable to nfs filesystems.
 3398  */
 3399 static int
 3400 nfs_pathconf(struct vop_pathconf_args *ap)
 3401 {
 3402         struct nfsv3_pathconf pc;
 3403         struct nfsvattr nfsva;
 3404         struct vnode *vp = ap->a_vp;
 3405         struct thread *td = curthread;
 3406         int attrflag, error;
 3407 
 3408         if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
 3409             ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
 3410             ap->a_name == _PC_NO_TRUNC)) ||
 3411             (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) {
 3412                 /*
 3413                  * Since only the above 4 a_names are returned by the NFSv3
 3414                  * Pathconf RPC, there is no point in doing it for others.
 3415                  * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
 3416                  * be used for _PC_NFS4_ACL as well.
 3417                  */
 3418                 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
 3419                     &attrflag, NULL);
 3420                 if (attrflag != 0)
 3421                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 3422                             1);
 3423                 if (error != 0)
 3424                         return (error);
 3425         } else {
 3426                 /*
 3427                  * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
 3428                  * just fake them.
 3429                  */
 3430                 pc.pc_linkmax = LINK_MAX;
 3431                 pc.pc_namemax = NFS_MAXNAMLEN;
 3432                 pc.pc_notrunc = 1;
 3433                 pc.pc_chownrestricted = 1;
 3434                 pc.pc_caseinsensitive = 0;
 3435                 pc.pc_casepreserving = 1;
 3436                 error = 0;
 3437         }
 3438         switch (ap->a_name) {
 3439         case _PC_LINK_MAX:
 3440                 *ap->a_retval = pc.pc_linkmax;
 3441                 break;
 3442         case _PC_NAME_MAX:
 3443                 *ap->a_retval = pc.pc_namemax;
 3444                 break;
 3445         case _PC_PATH_MAX:
 3446                 *ap->a_retval = PATH_MAX;
 3447                 break;
 3448         case _PC_PIPE_BUF:
 3449                 *ap->a_retval = PIPE_BUF;
 3450                 break;
 3451         case _PC_CHOWN_RESTRICTED:
 3452                 *ap->a_retval = pc.pc_chownrestricted;
 3453                 break;
 3454         case _PC_NO_TRUNC:
 3455                 *ap->a_retval = pc.pc_notrunc;
 3456                 break;
 3457         case _PC_ACL_EXTENDED:
 3458                 *ap->a_retval = 0;
 3459                 break;
 3460         case _PC_ACL_NFS4:
 3461                 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
 3462                     NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
 3463                         *ap->a_retval = 1;
 3464                 else
 3465                         *ap->a_retval = 0;
 3466                 break;
 3467         case _PC_ACL_PATH_MAX:
 3468                 if (NFS_ISV4(vp))
 3469                         *ap->a_retval = ACL_MAX_ENTRIES;
 3470                 else
 3471                         *ap->a_retval = 3;
 3472                 break;
 3473         case _PC_MAC_PRESENT:
 3474                 *ap->a_retval = 0;
 3475                 break;
 3476         case _PC_ASYNC_IO:
 3477                 /* _PC_ASYNC_IO should have been handled by upper layers. */
 3478                 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
 3479                 error = EINVAL;
 3480                 break;
 3481         case _PC_PRIO_IO:
 3482                 *ap->a_retval = 0;
 3483                 break;
 3484         case _PC_SYNC_IO:
 3485                 *ap->a_retval = 0;
 3486                 break;
 3487         case _PC_ALLOC_SIZE_MIN:
 3488                 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
 3489                 break;
 3490         case _PC_FILESIZEBITS:
 3491                 if (NFS_ISV34(vp))
 3492                         *ap->a_retval = 64;
 3493                 else
 3494                         *ap->a_retval = 32;
 3495                 break;
 3496         case _PC_REC_INCR_XFER_SIZE:
 3497                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3498                 break;
 3499         case _PC_REC_MAX_XFER_SIZE:
 3500                 *ap->a_retval = -1; /* means ``unlimited'' */
 3501                 break;
 3502         case _PC_REC_MIN_XFER_SIZE:
 3503                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3504                 break;
 3505         case _PC_REC_XFER_ALIGN:
 3506                 *ap->a_retval = PAGE_SIZE;
 3507                 break;
 3508         case _PC_SYMLINK_MAX:
 3509                 *ap->a_retval = NFS_MAXPATHLEN;
 3510                 break;
 3511 
 3512         default:
 3513                 error = EINVAL;
 3514                 break;
 3515         }
 3516         return (error);
 3517 }
 3518 

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