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


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

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from nfs_vnops.c        8.16 (Berkeley) 5/27/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/9.2/sys/fs/nfsclient/nfs_clvnops.c 250996 2013-05-26 12:36:56Z 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                         ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
  767                             NULL);
  768                         if (!ret) {
  769                                 np->n_change = nfsva.na_filerev;
  770                                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
  771                                     NULL, 0, 0);
  772                         }
  773                 }
  774 
  775                 /*
  776                  * and do the close.
  777                  */
  778                 ret = nfsrpc_close(vp, 0, ap->a_td);
  779                 if (!error && ret)
  780                         error = ret;
  781                 if (error)
  782                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  783                             (gid_t)0);
  784         }
  785         if (newnfs_directio_enable)
  786                 KASSERT((np->n_directio_asyncwr == 0),
  787                         ("nfs_close: dirty unflushed (%d) directio buffers\n",
  788                          np->n_directio_asyncwr));
  789         if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  790                 mtx_lock(&np->n_mtx);
  791                 KASSERT((np->n_directio_opens > 0), 
  792                         ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
  793                 np->n_directio_opens--;
  794                 if (np->n_directio_opens == 0)
  795                         np->n_flag &= ~NNONCACHE;
  796                 mtx_unlock(&np->n_mtx);
  797         }
  798         if (localcred)
  799                 NFSFREECRED(cred);
  800         return (error);
  801 }
  802 
  803 /*
  804  * nfs getattr call from vfs.
  805  */
  806 static int
  807 nfs_getattr(struct vop_getattr_args *ap)
  808 {
  809         struct vnode *vp = ap->a_vp;
  810         struct thread *td = curthread;  /* XXX */
  811         struct nfsnode *np = VTONFS(vp);
  812         int error = 0;
  813         struct nfsvattr nfsva;
  814         struct vattr *vap = ap->a_vap;
  815         struct vattr vattr;
  816 
  817         /*
  818          * Update local times for special files.
  819          */
  820         mtx_lock(&np->n_mtx);
  821         if (np->n_flag & (NACC | NUPD))
  822                 np->n_flag |= NCHG;
  823         mtx_unlock(&np->n_mtx);
  824         /*
  825          * First look in the cache.
  826          */
  827         if (ncl_getattrcache(vp, &vattr) == 0) {
  828                 vap->va_type = vattr.va_type;
  829                 vap->va_mode = vattr.va_mode;
  830                 vap->va_nlink = vattr.va_nlink;
  831                 vap->va_uid = vattr.va_uid;
  832                 vap->va_gid = vattr.va_gid;
  833                 vap->va_fsid = vattr.va_fsid;
  834                 vap->va_fileid = vattr.va_fileid;
  835                 vap->va_size = vattr.va_size;
  836                 vap->va_blocksize = vattr.va_blocksize;
  837                 vap->va_atime = vattr.va_atime;
  838                 vap->va_mtime = vattr.va_mtime;
  839                 vap->va_ctime = vattr.va_ctime;
  840                 vap->va_gen = vattr.va_gen;
  841                 vap->va_flags = vattr.va_flags;
  842                 vap->va_rdev = vattr.va_rdev;
  843                 vap->va_bytes = vattr.va_bytes;
  844                 vap->va_filerev = vattr.va_filerev;
  845                 /*
  846                  * Get the local modify time for the case of a write
  847                  * delegation.
  848                  */
  849                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  850                 return (0);
  851         }
  852 
  853         if (NFS_ISV34(vp) && nfs_prime_access_cache &&
  854             nfsaccess_cache_timeout > 0) {
  855                 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
  856                 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
  857                 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
  858                         nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
  859                         return (0);
  860                 }
  861         }
  862         error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
  863         if (!error)
  864                 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
  865         if (!error) {
  866                 /*
  867                  * Get the local modify time for the case of a write
  868                  * delegation.
  869                  */
  870                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  871         } else if (NFS_ISV4(vp)) {
  872                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  873         }
  874         return (error);
  875 }
  876 
  877 /*
  878  * nfs setattr call.
  879  */
  880 static int
  881 nfs_setattr(struct vop_setattr_args *ap)
  882 {
  883         struct vnode *vp = ap->a_vp;
  884         struct nfsnode *np = VTONFS(vp);
  885         struct thread *td = curthread;  /* XXX */
  886         struct vattr *vap = ap->a_vap;
  887         int error = 0;
  888         u_quad_t tsize;
  889 
  890 #ifndef nolint
  891         tsize = (u_quad_t)0;
  892 #endif
  893 
  894         /*
  895          * Setting of flags and marking of atimes are not supported.
  896          */
  897         if (vap->va_flags != VNOVAL)
  898                 return (EOPNOTSUPP);
  899 
  900         /*
  901          * Disallow write attempts if the filesystem is mounted read-only.
  902          */
  903         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  904             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  905             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  906             (vp->v_mount->mnt_flag & MNT_RDONLY))
  907                 return (EROFS);
  908         if (vap->va_size != VNOVAL) {
  909                 switch (vp->v_type) {
  910                 case VDIR:
  911                         return (EISDIR);
  912                 case VCHR:
  913                 case VBLK:
  914                 case VSOCK:
  915                 case VFIFO:
  916                         if (vap->va_mtime.tv_sec == VNOVAL &&
  917                             vap->va_atime.tv_sec == VNOVAL &&
  918                             vap->va_mode == (mode_t)VNOVAL &&
  919                             vap->va_uid == (uid_t)VNOVAL &&
  920                             vap->va_gid == (gid_t)VNOVAL)
  921                                 return (0);             
  922                         vap->va_size = VNOVAL;
  923                         break;
  924                 default:
  925                         /*
  926                          * Disallow write attempts if the filesystem is
  927                          * mounted read-only.
  928                          */
  929                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  930                                 return (EROFS);
  931                         /*
  932                          *  We run vnode_pager_setsize() early (why?),
  933                          * we must set np->n_size now to avoid vinvalbuf
  934                          * V_SAVE races that might setsize a lower
  935                          * value.
  936                          */
  937                         mtx_lock(&np->n_mtx);
  938                         tsize = np->n_size;
  939                         mtx_unlock(&np->n_mtx);
  940                         error = ncl_meta_setsize(vp, ap->a_cred, td,
  941                             vap->va_size);
  942                         mtx_lock(&np->n_mtx);
  943                         if (np->n_flag & NMODIFIED) {
  944                             tsize = np->n_size;
  945                             mtx_unlock(&np->n_mtx);
  946                             if (vap->va_size == 0)
  947                                 error = ncl_vinvalbuf(vp, 0, td, 1);
  948                             else
  949                                 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
  950                             if (error) {
  951                                 vnode_pager_setsize(vp, tsize);
  952                                 return (error);
  953                             }
  954                             /*
  955                              * Call nfscl_delegmodtime() to set the modify time
  956                              * locally, as required.
  957                              */
  958                             nfscl_delegmodtime(vp);
  959                         } else
  960                             mtx_unlock(&np->n_mtx);
  961                         /*
  962                          * np->n_size has already been set to vap->va_size
  963                          * in ncl_meta_setsize(). We must set it again since
  964                          * nfs_loadattrcache() could be called through
  965                          * ncl_meta_setsize() and could modify np->n_size.
  966                          */
  967                         mtx_lock(&np->n_mtx);
  968                         np->n_vattr.na_size = np->n_size = vap->va_size;
  969                         mtx_unlock(&np->n_mtx);
  970                 };
  971         } else {
  972                 mtx_lock(&np->n_mtx);
  973                 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 
  974                     (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
  975                         mtx_unlock(&np->n_mtx);
  976                         if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
  977                             (error == EINTR || error == EIO))
  978                                 return (error);
  979                 } else
  980                         mtx_unlock(&np->n_mtx);
  981         }
  982         error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
  983         if (error && vap->va_size != VNOVAL) {
  984                 mtx_lock(&np->n_mtx);
  985                 np->n_size = np->n_vattr.na_size = tsize;
  986                 vnode_pager_setsize(vp, tsize);
  987                 mtx_unlock(&np->n_mtx);
  988         }
  989         return (error);
  990 }
  991 
  992 /*
  993  * Do an nfs setattr rpc.
  994  */
  995 static int
  996 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
  997     struct thread *td)
  998 {
  999         struct nfsnode *np = VTONFS(vp);
 1000         int error, ret, attrflag, i;
 1001         struct nfsvattr nfsva;
 1002 
 1003         if (NFS_ISV34(vp)) {
 1004                 mtx_lock(&np->n_mtx);
 1005                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
 1006                         np->n_accesscache[i].stamp = 0;
 1007                 np->n_flag |= NDELEGMOD;
 1008                 mtx_unlock(&np->n_mtx);
 1009                 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
 1010         }
 1011         error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
 1012             NULL);
 1013         if (attrflag) {
 1014                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1015                 if (ret && !error)
 1016                         error = ret;
 1017         }
 1018         if (error && NFS_ISV4(vp))
 1019                 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
 1020         return (error);
 1021 }
 1022 
 1023 /*
 1024  * nfs lookup call, one step at a time...
 1025  * First look in cache
 1026  * If not found, unlock the directory nfsnode and do the rpc
 1027  */
 1028 static int
 1029 nfs_lookup(struct vop_lookup_args *ap)
 1030 {
 1031         struct componentname *cnp = ap->a_cnp;
 1032         struct vnode *dvp = ap->a_dvp;
 1033         struct vnode **vpp = ap->a_vpp;
 1034         struct mount *mp = dvp->v_mount;
 1035         int flags = cnp->cn_flags;
 1036         struct vnode *newvp;
 1037         struct nfsmount *nmp;
 1038         struct nfsnode *np, *newnp;
 1039         int error = 0, attrflag, dattrflag, ltype, ncticks;
 1040         struct thread *td = cnp->cn_thread;
 1041         struct nfsfh *nfhp;
 1042         struct nfsvattr dnfsva, nfsva;
 1043         struct vattr vattr;
 1044         struct timespec nctime;
 1045         
 1046         *vpp = NULLVP;
 1047         if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
 1048             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
 1049                 return (EROFS);
 1050         if (dvp->v_type != VDIR)
 1051                 return (ENOTDIR);
 1052         nmp = VFSTONFS(mp);
 1053         np = VTONFS(dvp);
 1054 
 1055         /* For NFSv4, wait until any remove is done. */
 1056         mtx_lock(&np->n_mtx);
 1057         while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
 1058                 np->n_flag |= NREMOVEWANT;
 1059                 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
 1060         }
 1061         mtx_unlock(&np->n_mtx);
 1062 
 1063         if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
 1064                 return (error);
 1065         error = cache_lookup_times(dvp, vpp, cnp, &nctime, &ncticks);
 1066         if (error > 0 && error != ENOENT)
 1067                 return (error);
 1068         if (error == -1) {
 1069                 /*
 1070                  * Lookups of "." are special and always return the
 1071                  * current directory.  cache_lookup() already handles
 1072                  * associated locking bookkeeping, etc.
 1073                  */
 1074                 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
 1075                         /* XXX: Is this really correct? */
 1076                         if (cnp->cn_nameiop != LOOKUP &&
 1077                             (flags & ISLASTCN))
 1078                                 cnp->cn_flags |= SAVENAME;
 1079                         return (0);
 1080                 }
 1081 
 1082                 /*
 1083                  * We only accept a positive hit in the cache if the
 1084                  * change time of the file matches our cached copy.
 1085                  * Otherwise, we discard the cache entry and fallback
 1086                  * to doing a lookup RPC.  We also only trust cache
 1087                  * entries for less than nm_nametimeo seconds.
 1088                  *
 1089                  * To better handle stale file handles and attributes,
 1090                  * clear the attribute cache of this node if it is a
 1091                  * leaf component, part of an open() call, and not
 1092                  * locally modified before fetching the attributes.
 1093                  * This should allow stale file handles to be detected
 1094                  * here where we can fall back to a LOOKUP RPC to
 1095                  * recover rather than having nfs_open() detect the
 1096                  * stale file handle and failing open(2) with ESTALE.
 1097                  */
 1098                 newvp = *vpp;
 1099                 newnp = VTONFS(newvp);
 1100                 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
 1101                     (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1102                     !(newnp->n_flag & NMODIFIED)) {
 1103                         mtx_lock(&newnp->n_mtx);
 1104                         newnp->n_attrstamp = 0;
 1105                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1106                         mtx_unlock(&newnp->n_mtx);
 1107                 }
 1108                 if (nfscl_nodeleg(newvp, 0) == 0 ||
 1109                     ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
 1110                     VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
 1111                     timespeccmp(&vattr.va_ctime, &nctime, ==))) {
 1112                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1113                         if (cnp->cn_nameiop != LOOKUP &&
 1114                             (flags & ISLASTCN))
 1115                                 cnp->cn_flags |= SAVENAME;
 1116                         return (0);
 1117                 }
 1118                 cache_purge(newvp);
 1119                 if (dvp != newvp)
 1120                         vput(newvp);
 1121                 else 
 1122                         vrele(newvp);
 1123                 *vpp = NULLVP;
 1124         } else if (error == ENOENT) {
 1125                 if (dvp->v_iflag & VI_DOOMED)
 1126                         return (ENOENT);
 1127                 /*
 1128                  * We only accept a negative hit in the cache if the
 1129                  * modification time of the parent directory matches
 1130                  * the cached copy in the name cache entry.
 1131                  * Otherwise, we discard all of the negative cache
 1132                  * entries for this directory.  We also only trust
 1133                  * negative cache entries for up to nm_negnametimeo
 1134                  * seconds.
 1135                  */
 1136                 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
 1137                     VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
 1138                     timespeccmp(&vattr.va_mtime, &nctime, ==)) {
 1139                         NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
 1140                         return (ENOENT);
 1141                 }
 1142                 cache_purge_negative(dvp);
 1143         }
 1144 
 1145         error = 0;
 1146         newvp = NULLVP;
 1147         NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
 1148         error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1149             cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1150             NULL);
 1151         if (dattrflag)
 1152                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1153         if (error) {
 1154                 if (newvp != NULLVP) {
 1155                         vput(newvp);
 1156                         *vpp = NULLVP;
 1157                 }
 1158 
 1159                 if (error != ENOENT) {
 1160                         if (NFS_ISV4(dvp))
 1161                                 error = nfscl_maperr(td, error, (uid_t)0,
 1162                                     (gid_t)0);
 1163                         return (error);
 1164                 }
 1165 
 1166                 /* The requested file was not found. */
 1167                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 1168                     (flags & ISLASTCN)) {
 1169                         /*
 1170                          * XXX: UFS does a full VOP_ACCESS(dvp,
 1171                          * VWRITE) here instead of just checking
 1172                          * MNT_RDONLY.
 1173                          */
 1174                         if (mp->mnt_flag & MNT_RDONLY)
 1175                                 return (EROFS);
 1176                         cnp->cn_flags |= SAVENAME;
 1177                         return (EJUSTRETURN);
 1178                 }
 1179 
 1180                 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE &&
 1181                     dattrflag) {
 1182                         /*
 1183                          * Cache the modification time of the parent
 1184                          * directory from the post-op attributes in
 1185                          * the name cache entry.  The negative cache
 1186                          * entry will be ignored once the directory
 1187                          * has changed.  Don't bother adding the entry
 1188                          * if the directory has already changed.
 1189                          */
 1190                         mtx_lock(&np->n_mtx);
 1191                         if (timespeccmp(&np->n_vattr.na_mtime,
 1192                             &dnfsva.na_mtime, ==)) {
 1193                                 mtx_unlock(&np->n_mtx);
 1194                                 cache_enter_time(dvp, NULL, cnp,
 1195                                     &dnfsva.na_mtime, NULL);
 1196                         } else
 1197                                 mtx_unlock(&np->n_mtx);
 1198                 }
 1199                 return (ENOENT);
 1200         }
 1201 
 1202         /*
 1203          * Handle RENAME case...
 1204          */
 1205         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 1206                 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1207                         FREE((caddr_t)nfhp, M_NFSFH);
 1208                         return (EISDIR);
 1209                 }
 1210                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1211                     LK_EXCLUSIVE);
 1212                 if (error)
 1213                         return (error);
 1214                 newvp = NFSTOV(np);
 1215                 if (attrflag)
 1216                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1217                             0, 1);
 1218                 *vpp = newvp;
 1219                 cnp->cn_flags |= SAVENAME;
 1220                 return (0);
 1221         }
 1222 
 1223         if (flags & ISDOTDOT) {
 1224                 ltype = NFSVOPISLOCKED(dvp);
 1225                 error = vfs_busy(mp, MBF_NOWAIT);
 1226                 if (error != 0) {
 1227                         vfs_ref(mp);
 1228                         NFSVOPUNLOCK(dvp, 0);
 1229                         error = vfs_busy(mp, 0);
 1230                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1231                         vfs_rel(mp);
 1232                         if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
 1233                                 vfs_unbusy(mp);
 1234                                 error = ENOENT;
 1235                         }
 1236                         if (error != 0)
 1237                                 return (error);
 1238                 }
 1239                 NFSVOPUNLOCK(dvp, 0);
 1240                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1241                     cnp->cn_lkflags);
 1242                 if (error == 0)
 1243                         newvp = NFSTOV(np);
 1244                 vfs_unbusy(mp);
 1245                 if (newvp != dvp)
 1246                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1247                 if (dvp->v_iflag & VI_DOOMED) {
 1248                         if (error == 0) {
 1249                                 if (newvp == dvp)
 1250                                         vrele(newvp);
 1251                                 else
 1252                                         vput(newvp);
 1253                         }
 1254                         error = ENOENT;
 1255                 }
 1256                 if (error != 0)
 1257                         return (error);
 1258                 if (attrflag)
 1259                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1260                             0, 1);
 1261         } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1262                 FREE((caddr_t)nfhp, M_NFSFH);
 1263                 VREF(dvp);
 1264                 newvp = dvp;
 1265                 if (attrflag)
 1266                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1267                             0, 1);
 1268         } else {
 1269                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1270                     cnp->cn_lkflags);
 1271                 if (error)
 1272                         return (error);
 1273                 newvp = NFSTOV(np);
 1274                 if (attrflag)
 1275                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1276                             0, 1);
 1277                 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1278                     !(np->n_flag & NMODIFIED)) {                        
 1279                         /*
 1280                          * Flush the attribute cache when opening a
 1281                          * leaf node to ensure that fresh attributes
 1282                          * are fetched in nfs_open() since we did not
 1283                          * fetch attributes from the LOOKUP reply.
 1284                          */
 1285                         mtx_lock(&np->n_mtx);
 1286                         np->n_attrstamp = 0;
 1287                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1288                         mtx_unlock(&np->n_mtx);
 1289                 }
 1290         }
 1291         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1292                 cnp->cn_flags |= SAVENAME;
 1293         if ((cnp->cn_flags & MAKEENTRY) &&
 1294             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
 1295             attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
 1296                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1297                     newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
 1298         *vpp = newvp;
 1299         return (0);
 1300 }
 1301 
 1302 /*
 1303  * nfs read call.
 1304  * Just call ncl_bioread() to do the work.
 1305  */
 1306 static int
 1307 nfs_read(struct vop_read_args *ap)
 1308 {
 1309         struct vnode *vp = ap->a_vp;
 1310 
 1311         switch (vp->v_type) {
 1312         case VREG:
 1313                 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1314         case VDIR:
 1315                 return (EISDIR);
 1316         default:
 1317                 return (EOPNOTSUPP);
 1318         }
 1319 }
 1320 
 1321 /*
 1322  * nfs readlink call
 1323  */
 1324 static int
 1325 nfs_readlink(struct vop_readlink_args *ap)
 1326 {
 1327         struct vnode *vp = ap->a_vp;
 1328 
 1329         if (vp->v_type != VLNK)
 1330                 return (EINVAL);
 1331         return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1332 }
 1333 
 1334 /*
 1335  * Do a readlink rpc.
 1336  * Called by ncl_doio() from below the buffer cache.
 1337  */
 1338 int
 1339 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1340 {
 1341         int error, ret, attrflag;
 1342         struct nfsvattr nfsva;
 1343 
 1344         error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
 1345             &attrflag, NULL);
 1346         if (attrflag) {
 1347                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1348                 if (ret && !error)
 1349                         error = ret;
 1350         }
 1351         if (error && NFS_ISV4(vp))
 1352                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1353         return (error);
 1354 }
 1355 
 1356 /*
 1357  * nfs read rpc call
 1358  * Ditto above
 1359  */
 1360 int
 1361 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1362 {
 1363         int error, ret, attrflag;
 1364         struct nfsvattr nfsva;
 1365 
 1366         error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, &attrflag,
 1367             NULL);
 1368         if (attrflag) {
 1369                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1370                 if (ret && !error)
 1371                         error = ret;
 1372         }
 1373         if (error && NFS_ISV4(vp))
 1374                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1375         return (error);
 1376 }
 1377 
 1378 /*
 1379  * nfs write call
 1380  */
 1381 int
 1382 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1383     int *iomode, int *must_commit, int called_from_strategy)
 1384 {
 1385         struct nfsvattr nfsva;
 1386         int error = 0, attrflag, ret;
 1387 
 1388         error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
 1389             uiop->uio_td, &nfsva, &attrflag, NULL, called_from_strategy);
 1390         if (attrflag) {
 1391                 if (VTONFS(vp)->n_flag & ND_NFSV4)
 1392                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
 1393                             1);
 1394                 else
 1395                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 1396                             1);
 1397                 if (ret && !error)
 1398                         error = ret;
 1399         }
 1400         if (DOINGASYNC(vp))
 1401                 *iomode = NFSWRITE_FILESYNC;
 1402         if (error && NFS_ISV4(vp))
 1403                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1404         return (error);
 1405 }
 1406 
 1407 /*
 1408  * nfs mknod rpc
 1409  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1410  * mode set to specify the file type and the size field for rdev.
 1411  */
 1412 static int
 1413 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1414     struct vattr *vap)
 1415 {
 1416         struct nfsvattr nfsva, dnfsva;
 1417         struct vnode *newvp = NULL;
 1418         struct nfsnode *np = NULL, *dnp;
 1419         struct nfsfh *nfhp;
 1420         struct vattr vattr;
 1421         int error = 0, attrflag, dattrflag;
 1422         u_int32_t rdev;
 1423 
 1424         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1425                 rdev = vap->va_rdev;
 1426         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1427                 rdev = 0xffffffff;
 1428         else
 1429                 return (EOPNOTSUPP);
 1430         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1431                 return (error);
 1432         error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
 1433             rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 1434             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 1435         if (!error) {
 1436                 if (!nfhp)
 1437                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1438                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1439                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1440                             NULL);
 1441                 if (nfhp)
 1442                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1443                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1444         }
 1445         if (dattrflag)
 1446                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1447         if (!error) {
 1448                 newvp = NFSTOV(np);
 1449                 if (attrflag != 0) {
 1450                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1451                             0, 1);
 1452                         if (error != 0)
 1453                                 vput(newvp);
 1454                 }
 1455         }
 1456         if (!error) {
 1457                 *vpp = newvp;
 1458         } else if (NFS_ISV4(dvp)) {
 1459                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1460                     vap->va_gid);
 1461         }
 1462         dnp = VTONFS(dvp);
 1463         mtx_lock(&dnp->n_mtx);
 1464         dnp->n_flag |= NMODIFIED;
 1465         if (!dattrflag) {
 1466                 dnp->n_attrstamp = 0;
 1467                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1468         }
 1469         mtx_unlock(&dnp->n_mtx);
 1470         return (error);
 1471 }
 1472 
 1473 /*
 1474  * nfs mknod vop
 1475  * just call nfs_mknodrpc() to do the work.
 1476  */
 1477 /* ARGSUSED */
 1478 static int
 1479 nfs_mknod(struct vop_mknod_args *ap)
 1480 {
 1481         return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
 1482 }
 1483 
 1484 static struct mtx nfs_cverf_mtx;
 1485 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
 1486     MTX_DEF);
 1487 
 1488 static nfsquad_t
 1489 nfs_get_cverf(void)
 1490 {
 1491         static nfsquad_t cverf;
 1492         nfsquad_t ret;
 1493         static int cverf_initialized = 0;
 1494 
 1495         mtx_lock(&nfs_cverf_mtx);
 1496         if (cverf_initialized == 0) {
 1497                 cverf.lval[0] = arc4random();
 1498                 cverf.lval[1] = arc4random();
 1499                 cverf_initialized = 1;
 1500         } else
 1501                 cverf.qval++;
 1502         ret = cverf;
 1503         mtx_unlock(&nfs_cverf_mtx);
 1504 
 1505         return (ret);
 1506 }
 1507 
 1508 /*
 1509  * nfs file create call
 1510  */
 1511 static int
 1512 nfs_create(struct vop_create_args *ap)
 1513 {
 1514         struct vnode *dvp = ap->a_dvp;
 1515         struct vattr *vap = ap->a_vap;
 1516         struct componentname *cnp = ap->a_cnp;
 1517         struct nfsnode *np = NULL, *dnp;
 1518         struct vnode *newvp = NULL;
 1519         struct nfsmount *nmp;
 1520         struct nfsvattr dnfsva, nfsva;
 1521         struct nfsfh *nfhp;
 1522         nfsquad_t cverf;
 1523         int error = 0, attrflag, dattrflag, fmode = 0;
 1524         struct vattr vattr;
 1525 
 1526         /*
 1527          * Oops, not for me..
 1528          */
 1529         if (vap->va_type == VSOCK)
 1530                 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 1531 
 1532         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1533                 return (error);
 1534         if (vap->va_vaflags & VA_EXCLUSIVE)
 1535                 fmode |= O_EXCL;
 1536         dnp = VTONFS(dvp);
 1537         nmp = VFSTONFS(vnode_mount(dvp));
 1538 again:
 1539         /* For NFSv4, wait until any remove is done. */
 1540         mtx_lock(&dnp->n_mtx);
 1541         while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
 1542                 dnp->n_flag |= NREMOVEWANT;
 1543                 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
 1544         }
 1545         mtx_unlock(&dnp->n_mtx);
 1546 
 1547         cverf = nfs_get_cverf();
 1548         error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1549             vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
 1550             &nfhp, &attrflag, &dattrflag, NULL);
 1551         if (!error) {
 1552                 if (nfhp == NULL)
 1553                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1554                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1555                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1556                             NULL);
 1557                 if (nfhp != NULL)
 1558                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1559                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1560         }
 1561         if (dattrflag)
 1562                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1563         if (!error) {
 1564                 newvp = NFSTOV(np);
 1565                 if (attrflag == 0)
 1566                         error = nfsrpc_getattr(newvp, cnp->cn_cred,
 1567                             cnp->cn_thread, &nfsva, NULL);
 1568                 if (error == 0)
 1569                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1570                             0, 1);
 1571         }
 1572         if (error) {
 1573                 if (newvp != NULL) {
 1574                         vput(newvp);
 1575                         newvp = NULL;
 1576                 }
 1577                 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
 1578                     error == NFSERR_NOTSUPP) {
 1579                         fmode &= ~O_EXCL;
 1580                         goto again;
 1581                 }
 1582         } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
 1583                 if (nfscl_checksattr(vap, &nfsva)) {
 1584                         /*
 1585                          * We are normally called with only a partially
 1586                          * initialized VAP. Since the NFSv3 spec says that
 1587                          * the server may use the file attributes to
 1588                          * store the verifier, the spec requires us to do a
 1589                          * SETATTR RPC. FreeBSD servers store the verifier in
 1590                          * atime, but we can't really assume that all servers
 1591                          * will so we ensure that our SETATTR sets both atime
 1592                          * and mtime.
 1593                          */
 1594                         if (vap->va_mtime.tv_sec == VNOVAL)
 1595                                 vfs_timestamp(&vap->va_mtime);
 1596                         if (vap->va_atime.tv_sec == VNOVAL)
 1597                                 vap->va_atime = vap->va_mtime;
 1598                         error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
 1599                             cnp->cn_thread, &nfsva, &attrflag, NULL);
 1600                         if (error && (vap->va_uid != (uid_t)VNOVAL ||
 1601                             vap->va_gid != (gid_t)VNOVAL)) {
 1602                                 /* try again without setting uid/gid */
 1603                                 vap->va_uid = (uid_t)VNOVAL;
 1604                                 vap->va_gid = (uid_t)VNOVAL;
 1605                                 error = nfsrpc_setattr(newvp, vap, NULL, 
 1606                                     cnp->cn_cred, cnp->cn_thread, &nfsva,
 1607                                     &attrflag, NULL);
 1608                         }
 1609                         if (attrflag)
 1610                                 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 1611                                     NULL, 0, 1);
 1612                         if (error != 0)
 1613                                 vput(newvp);
 1614                 }
 1615         }
 1616         if (!error) {
 1617                 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
 1618                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1619                             NULL);
 1620                 *ap->a_vpp = newvp;
 1621         } else if (NFS_ISV4(dvp)) {
 1622                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1623                     vap->va_gid);
 1624         }
 1625         mtx_lock(&dnp->n_mtx);
 1626         dnp->n_flag |= NMODIFIED;
 1627         if (!dattrflag) {
 1628                 dnp->n_attrstamp = 0;
 1629                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1630         }
 1631         mtx_unlock(&dnp->n_mtx);
 1632         return (error);
 1633 }
 1634 
 1635 /*
 1636  * nfs file remove call
 1637  * To try and make nfs semantics closer to ufs semantics, a file that has
 1638  * other processes using the vnode is renamed instead of removed and then
 1639  * removed later on the last close.
 1640  * - If v_usecount > 1
 1641  *        If a rename is not already in the works
 1642  *           call nfs_sillyrename() to set it up
 1643  *     else
 1644  *        do the remove rpc
 1645  */
 1646 static int
 1647 nfs_remove(struct vop_remove_args *ap)
 1648 {
 1649         struct vnode *vp = ap->a_vp;
 1650         struct vnode *dvp = ap->a_dvp;
 1651         struct componentname *cnp = ap->a_cnp;
 1652         struct nfsnode *np = VTONFS(vp);
 1653         int error = 0;
 1654         struct vattr vattr;
 1655 
 1656         KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
 1657         KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
 1658         if (vp->v_type == VDIR)
 1659                 error = EPERM;
 1660         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1661             VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
 1662             vattr.va_nlink > 1)) {
 1663                 /*
 1664                  * Purge the name cache so that the chance of a lookup for
 1665                  * the name succeeding while the remove is in progress is
 1666                  * minimized. Without node locking it can still happen, such
 1667                  * that an I/O op returns ESTALE, but since you get this if
 1668                  * another host removes the file..
 1669                  */
 1670                 cache_purge(vp);
 1671                 /*
 1672                  * throw away biocache buffers, mainly to avoid
 1673                  * unnecessary delayed writes later.
 1674                  */
 1675                 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1676                 /* Do the rpc */
 1677                 if (error != EINTR && error != EIO)
 1678                         error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
 1679                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1680                 /*
 1681                  * Kludge City: If the first reply to the remove rpc is lost..
 1682                  *   the reply to the retransmitted request will be ENOENT
 1683                  *   since the file was in fact removed
 1684                  *   Therefore, we cheat and return success.
 1685                  */
 1686                 if (error == ENOENT)
 1687                         error = 0;
 1688         } else if (!np->n_sillyrename)
 1689                 error = nfs_sillyrename(dvp, vp, cnp);
 1690         mtx_lock(&np->n_mtx);
 1691         np->n_attrstamp = 0;
 1692         mtx_unlock(&np->n_mtx);
 1693         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1694         return (error);
 1695 }
 1696 
 1697 /*
 1698  * nfs file remove rpc called from nfs_inactive
 1699  */
 1700 int
 1701 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
 1702 {
 1703         /*
 1704          * Make sure that the directory vnode is still valid.
 1705          * XXX we should lock sp->s_dvp here.
 1706          */
 1707         if (sp->s_dvp->v_type == VBAD)
 1708                 return (0);
 1709         return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
 1710             sp->s_cred, NULL));
 1711 }
 1712 
 1713 /*
 1714  * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
 1715  */
 1716 static int
 1717 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
 1718     int namelen, struct ucred *cred, struct thread *td)
 1719 {
 1720         struct nfsvattr dnfsva;
 1721         struct nfsnode *dnp = VTONFS(dvp);
 1722         int error = 0, dattrflag;
 1723 
 1724         mtx_lock(&dnp->n_mtx);
 1725         dnp->n_flag |= NREMOVEINPROG;
 1726         mtx_unlock(&dnp->n_mtx);
 1727         error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
 1728             &dattrflag, NULL);
 1729         mtx_lock(&dnp->n_mtx);
 1730         if ((dnp->n_flag & NREMOVEWANT)) {
 1731                 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
 1732                 mtx_unlock(&dnp->n_mtx);
 1733                 wakeup((caddr_t)dnp);
 1734         } else {
 1735                 dnp->n_flag &= ~NREMOVEINPROG;
 1736                 mtx_unlock(&dnp->n_mtx);
 1737         }
 1738         if (dattrflag)
 1739                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1740         mtx_lock(&dnp->n_mtx);
 1741         dnp->n_flag |= NMODIFIED;
 1742         if (!dattrflag) {
 1743                 dnp->n_attrstamp = 0;
 1744                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1745         }
 1746         mtx_unlock(&dnp->n_mtx);
 1747         if (error && NFS_ISV4(dvp))
 1748                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1749         return (error);
 1750 }
 1751 
 1752 /*
 1753  * nfs file rename call
 1754  */
 1755 static int
 1756 nfs_rename(struct vop_rename_args *ap)
 1757 {
 1758         struct vnode *fvp = ap->a_fvp;
 1759         struct vnode *tvp = ap->a_tvp;
 1760         struct vnode *fdvp = ap->a_fdvp;
 1761         struct vnode *tdvp = ap->a_tdvp;
 1762         struct componentname *tcnp = ap->a_tcnp;
 1763         struct componentname *fcnp = ap->a_fcnp;
 1764         struct nfsnode *fnp = VTONFS(ap->a_fvp);
 1765         struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
 1766         struct nfsv4node *newv4 = NULL;
 1767         int error;
 1768 
 1769         KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
 1770             (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
 1771         /* Check for cross-device rename */
 1772         if ((fvp->v_mount != tdvp->v_mount) ||
 1773             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1774                 error = EXDEV;
 1775                 goto out;
 1776         }
 1777 
 1778         if (fvp == tvp) {
 1779                 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n");
 1780                 error = 0;
 1781                 goto out;
 1782         }
 1783         if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
 1784                 goto out;
 1785 
 1786         /*
 1787          * We have to flush B_DELWRI data prior to renaming
 1788          * the file.  If we don't, the delayed-write buffers
 1789          * can be flushed out later after the file has gone stale
 1790          * under NFSV3.  NFSV2 does not have this problem because
 1791          * ( as far as I can tell ) it flushes dirty buffers more
 1792          * often.
 1793          * 
 1794          * Skip the rename operation if the fsync fails, this can happen
 1795          * due to the server's volume being full, when we pushed out data
 1796          * that was written back to our cache earlier. Not checking for
 1797          * this condition can result in potential (silent) data loss.
 1798          */
 1799         error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1800         NFSVOPUNLOCK(fvp, 0);
 1801         if (!error && tvp)
 1802                 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1803         if (error)
 1804                 goto out;
 1805 
 1806         /*
 1807          * If the tvp exists and is in use, sillyrename it before doing the
 1808          * rename of the new file over it.
 1809          * XXX Can't sillyrename a directory.
 1810          */
 1811         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1812                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1813                 vput(tvp);
 1814                 tvp = NULL;
 1815         }
 1816 
 1817         error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1818             tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1819             tcnp->cn_thread);
 1820 
 1821         if (error == 0 && NFS_ISV4(tdvp)) {
 1822                 /*
 1823                  * For NFSv4, check to see if it is the same name and
 1824                  * replace the name, if it is different.
 1825                  */
 1826                 MALLOC(newv4, struct nfsv4node *,
 1827                     sizeof (struct nfsv4node) +
 1828                     tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
 1829                     M_NFSV4NODE, M_WAITOK);
 1830                 mtx_lock(&tdnp->n_mtx);
 1831                 mtx_lock(&fnp->n_mtx);
 1832                 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
 1833                     (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
 1834                       NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
 1835                       tcnp->cn_namelen) ||
 1836                       tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
 1837                       NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1838                         tdnp->n_fhp->nfh_len))) {
 1839 #ifdef notdef
 1840 { char nnn[100]; int nnnl;
 1841 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
 1842 bcopy(tcnp->cn_nameptr, nnn, nnnl);
 1843 nnn[nnnl] = '\0';
 1844 printf("ren replace=%s\n",nnn);
 1845 }
 1846 #endif
 1847                         FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
 1848                         fnp->n_v4 = newv4;
 1849                         newv4 = NULL;
 1850                         fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
 1851                         fnp->n_v4->n4_namelen = tcnp->cn_namelen;
 1852                         NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1853                             tdnp->n_fhp->nfh_len);
 1854                         NFSBCOPY(tcnp->cn_nameptr,
 1855                             NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
 1856                 }
 1857                 mtx_unlock(&tdnp->n_mtx);
 1858                 mtx_unlock(&fnp->n_mtx);
 1859                 if (newv4 != NULL)
 1860                         FREE((caddr_t)newv4, M_NFSV4NODE);
 1861         }
 1862 
 1863         if (fvp->v_type == VDIR) {
 1864                 if (tvp != NULL && tvp->v_type == VDIR)
 1865                         cache_purge(tdvp);
 1866                 cache_purge(fdvp);
 1867         }
 1868 
 1869 out:
 1870         if (tdvp == tvp)
 1871                 vrele(tdvp);
 1872         else
 1873                 vput(tdvp);
 1874         if (tvp)
 1875                 vput(tvp);
 1876         vrele(fdvp);
 1877         vrele(fvp);
 1878         /*
 1879          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1880          */
 1881         if (error == ENOENT)
 1882                 error = 0;
 1883         return (error);
 1884 }
 1885 
 1886 /*
 1887  * nfs file rename rpc called from nfs_remove() above
 1888  */
 1889 static int
 1890 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
 1891     struct sillyrename *sp)
 1892 {
 1893 
 1894         return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
 1895             sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
 1896             scnp->cn_thread));
 1897 }
 1898 
 1899 /*
 1900  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 1901  */
 1902 static int
 1903 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
 1904     int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
 1905     int tnamelen, struct ucred *cred, struct thread *td)
 1906 {
 1907         struct nfsvattr fnfsva, tnfsva;
 1908         struct nfsnode *fdnp = VTONFS(fdvp);
 1909         struct nfsnode *tdnp = VTONFS(tdvp);
 1910         int error = 0, fattrflag, tattrflag;
 1911 
 1912         error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
 1913             tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
 1914             &tattrflag, NULL, NULL);
 1915         mtx_lock(&fdnp->n_mtx);
 1916         fdnp->n_flag |= NMODIFIED;
 1917         if (fattrflag != 0) {
 1918                 mtx_unlock(&fdnp->n_mtx);
 1919                 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
 1920         } else {
 1921                 fdnp->n_attrstamp = 0;
 1922                 mtx_unlock(&fdnp->n_mtx);
 1923                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
 1924         }
 1925         mtx_lock(&tdnp->n_mtx);
 1926         tdnp->n_flag |= NMODIFIED;
 1927         if (tattrflag != 0) {
 1928                 mtx_unlock(&tdnp->n_mtx);
 1929                 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
 1930         } else {
 1931                 tdnp->n_attrstamp = 0;
 1932                 mtx_unlock(&tdnp->n_mtx);
 1933                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 1934         }
 1935         if (error && NFS_ISV4(fdvp))
 1936                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1937         return (error);
 1938 }
 1939 
 1940 /*
 1941  * nfs hard link create call
 1942  */
 1943 static int
 1944 nfs_link(struct vop_link_args *ap)
 1945 {
 1946         struct vnode *vp = ap->a_vp;
 1947         struct vnode *tdvp = ap->a_tdvp;
 1948         struct componentname *cnp = ap->a_cnp;
 1949         struct nfsnode *np, *tdnp;
 1950         struct nfsvattr nfsva, dnfsva;
 1951         int error = 0, attrflag, dattrflag;
 1952 
 1953         if (vp->v_mount != tdvp->v_mount) {
 1954                 return (EXDEV);
 1955         }
 1956 
 1957         /*
 1958          * Push all writes to the server, so that the attribute cache
 1959          * doesn't get "out of sync" with the server.
 1960          * XXX There should be a better way!
 1961          */
 1962         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 1963 
 1964         error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
 1965             cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
 1966             &dattrflag, NULL);
 1967         tdnp = VTONFS(tdvp);
 1968         mtx_lock(&tdnp->n_mtx);
 1969         tdnp->n_flag |= NMODIFIED;
 1970         if (dattrflag != 0) {
 1971                 mtx_unlock(&tdnp->n_mtx);
 1972                 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
 1973         } else {
 1974                 tdnp->n_attrstamp = 0;
 1975                 mtx_unlock(&tdnp->n_mtx);
 1976                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 1977         }
 1978         if (attrflag)
 1979                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1980         else {
 1981                 np = VTONFS(vp);
 1982                 mtx_lock(&np->n_mtx);
 1983                 np->n_attrstamp = 0;
 1984                 mtx_unlock(&np->n_mtx);
 1985                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1986         }
 1987         /*
 1988          * If negative lookup caching is enabled, I might as well
 1989          * add an entry for this node. Not necessary for correctness,
 1990          * but if negative caching is enabled, then the system
 1991          * must care about lookup caching hit rate, so...
 1992          */
 1993         if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
 1994             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 1995                 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
 1996         }
 1997         if (error && NFS_ISV4(vp))
 1998                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 1999                     (gid_t)0);
 2000         return (error);
 2001 }
 2002 
 2003 /*
 2004  * nfs symbolic link create call
 2005  */
 2006 static int
 2007 nfs_symlink(struct vop_symlink_args *ap)
 2008 {
 2009         struct vnode *dvp = ap->a_dvp;
 2010         struct vattr *vap = ap->a_vap;
 2011         struct componentname *cnp = ap->a_cnp;
 2012         struct nfsvattr nfsva, dnfsva;
 2013         struct nfsfh *nfhp;
 2014         struct nfsnode *np = NULL, *dnp;
 2015         struct vnode *newvp = NULL;
 2016         int error = 0, attrflag, dattrflag, ret;
 2017 
 2018         vap->va_type = VLNK;
 2019         error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2020             ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 2021             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 2022         if (nfhp) {
 2023                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2024                     &np, NULL, LK_EXCLUSIVE);
 2025                 if (!ret)
 2026                         newvp = NFSTOV(np);
 2027                 else if (!error)
 2028                         error = ret;
 2029         }
 2030         if (newvp != NULL) {
 2031                 if (attrflag)
 2032                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2033                             0, 1);
 2034         } else if (!error) {
 2035                 /*
 2036                  * If we do not have an error and we could not extract the
 2037                  * newvp from the response due to the request being NFSv2, we
 2038                  * have to do a lookup in order to obtain a newvp to return.
 2039                  */
 2040                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2041                     cnp->cn_cred, cnp->cn_thread, &np);
 2042                 if (!error)
 2043                         newvp = NFSTOV(np);
 2044         }
 2045         if (error) {
 2046                 if (newvp)
 2047                         vput(newvp);
 2048                 if (NFS_ISV4(dvp))
 2049                         error = nfscl_maperr(cnp->cn_thread, error,
 2050                             vap->va_uid, vap->va_gid);
 2051         } else {
 2052                 *ap->a_vpp = newvp;
 2053         }
 2054 
 2055         dnp = VTONFS(dvp);
 2056         mtx_lock(&dnp->n_mtx);
 2057         dnp->n_flag |= NMODIFIED;
 2058         if (dattrflag != 0) {
 2059                 mtx_unlock(&dnp->n_mtx);
 2060                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2061         } else {
 2062                 dnp->n_attrstamp = 0;
 2063                 mtx_unlock(&dnp->n_mtx);
 2064                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2065         }
 2066         /*
 2067          * If negative lookup caching is enabled, I might as well
 2068          * add an entry for this node. Not necessary for correctness,
 2069          * but if negative caching is enabled, then the system
 2070          * must care about lookup caching hit rate, so...
 2071          */
 2072         if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2073             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 2074                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
 2075         }
 2076         return (error);
 2077 }
 2078 
 2079 /*
 2080  * nfs make dir call
 2081  */
 2082 static int
 2083 nfs_mkdir(struct vop_mkdir_args *ap)
 2084 {
 2085         struct vnode *dvp = ap->a_dvp;
 2086         struct vattr *vap = ap->a_vap;
 2087         struct componentname *cnp = ap->a_cnp;
 2088         struct nfsnode *np = NULL, *dnp;
 2089         struct vnode *newvp = NULL;
 2090         struct vattr vattr;
 2091         struct nfsfh *nfhp;
 2092         struct nfsvattr nfsva, dnfsva;
 2093         int error = 0, attrflag, dattrflag, ret;
 2094 
 2095         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
 2096                 return (error);
 2097         vap->va_type = VDIR;
 2098         error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2099             vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
 2100             &attrflag, &dattrflag, NULL);
 2101         dnp = VTONFS(dvp);
 2102         mtx_lock(&dnp->n_mtx);
 2103         dnp->n_flag |= NMODIFIED;
 2104         if (dattrflag != 0) {
 2105                 mtx_unlock(&dnp->n_mtx);
 2106                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2107         } else {
 2108                 dnp->n_attrstamp = 0;
 2109                 mtx_unlock(&dnp->n_mtx);
 2110                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2111         }
 2112         if (nfhp) {
 2113                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2114                     &np, NULL, LK_EXCLUSIVE);
 2115                 if (!ret) {
 2116                         newvp = NFSTOV(np);
 2117                         if (attrflag)
 2118                            (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 2119                                 NULL, 0, 1);
 2120                 } else if (!error)
 2121                         error = ret;
 2122         }
 2123         if (!error && newvp == NULL) {
 2124                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2125                     cnp->cn_cred, cnp->cn_thread, &np);
 2126                 if (!error) {
 2127                         newvp = NFSTOV(np);
 2128                         if (newvp->v_type != VDIR)
 2129                                 error = EEXIST;
 2130                 }
 2131         }
 2132         if (error) {
 2133                 if (newvp)
 2134                         vput(newvp);
 2135                 if (NFS_ISV4(dvp))
 2136                         error = nfscl_maperr(cnp->cn_thread, error,
 2137                             vap->va_uid, vap->va_gid);
 2138         } else {
 2139                 /*
 2140                  * If negative lookup caching is enabled, I might as well
 2141                  * add an entry for this node. Not necessary for correctness,
 2142                  * but if negative caching is enabled, then the system
 2143                  * must care about lookup caching hit rate, so...
 2144                  */
 2145                 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2146                     (cnp->cn_flags & MAKEENTRY) &&
 2147                     attrflag != 0 && dattrflag != 0)
 2148                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 2149                             &dnfsva.na_ctime);
 2150                 *ap->a_vpp = newvp;
 2151         }
 2152         return (error);
 2153 }
 2154 
 2155 /*
 2156  * nfs remove directory call
 2157  */
 2158 static int
 2159 nfs_rmdir(struct vop_rmdir_args *ap)
 2160 {
 2161         struct vnode *vp = ap->a_vp;
 2162         struct vnode *dvp = ap->a_dvp;
 2163         struct componentname *cnp = ap->a_cnp;
 2164         struct nfsnode *dnp;
 2165         struct nfsvattr dnfsva;
 2166         int error, dattrflag;
 2167 
 2168         if (dvp == vp)
 2169                 return (EINVAL);
 2170         error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2171             cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
 2172         dnp = VTONFS(dvp);
 2173         mtx_lock(&dnp->n_mtx);
 2174         dnp->n_flag |= NMODIFIED;
 2175         if (dattrflag != 0) {
 2176                 mtx_unlock(&dnp->n_mtx);
 2177                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2178         } else {
 2179                 dnp->n_attrstamp = 0;
 2180                 mtx_unlock(&dnp->n_mtx);
 2181                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2182         }
 2183 
 2184         cache_purge(dvp);
 2185         cache_purge(vp);
 2186         if (error && NFS_ISV4(dvp))
 2187                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2188                     (gid_t)0);
 2189         /*
 2190          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 2191          */
 2192         if (error == ENOENT)
 2193                 error = 0;
 2194         return (error);
 2195 }
 2196 
 2197 /*
 2198  * nfs readdir call
 2199  */
 2200 static int
 2201 nfs_readdir(struct vop_readdir_args *ap)
 2202 {
 2203         struct vnode *vp = ap->a_vp;
 2204         struct nfsnode *np = VTONFS(vp);
 2205         struct uio *uio = ap->a_uio;
 2206         ssize_t tresid;
 2207         int error = 0;
 2208         struct vattr vattr;
 2209         
 2210         if (ap->a_eofflag != NULL)
 2211                 *ap->a_eofflag = 0;
 2212         if (vp->v_type != VDIR) 
 2213                 return(EPERM);
 2214 
 2215         /*
 2216          * First, check for hit on the EOF offset cache
 2217          */
 2218         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 2219             (np->n_flag & NMODIFIED) == 0) {
 2220                 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
 2221                         mtx_lock(&np->n_mtx);
 2222                         if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
 2223                             !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 2224                                 mtx_unlock(&np->n_mtx);
 2225                                 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
 2226                                 if (ap->a_eofflag != NULL)
 2227                                         *ap->a_eofflag = 1;
 2228                                 return (0);
 2229                         } else
 2230                                 mtx_unlock(&np->n_mtx);
 2231                 }
 2232         }
 2233 
 2234         /*
 2235          * Call ncl_bioread() to do the real work.
 2236          */
 2237         tresid = uio->uio_resid;
 2238         error = ncl_bioread(vp, uio, 0, ap->a_cred);
 2239 
 2240         if (!error && uio->uio_resid == tresid) {
 2241                 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
 2242                 if (ap->a_eofflag != NULL)
 2243                         *ap->a_eofflag = 1;
 2244         }
 2245         return (error);
 2246 }
 2247 
 2248 /*
 2249  * Readdir rpc call.
 2250  * Called from below the buffer cache by ncl_doio().
 2251  */
 2252 int
 2253 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2254     struct thread *td)
 2255 {
 2256         struct nfsvattr nfsva;
 2257         nfsuint64 *cookiep, cookie;
 2258         struct nfsnode *dnp = VTONFS(vp);
 2259         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2260         int error = 0, eof, attrflag;
 2261 
 2262         KASSERT(uiop->uio_iovcnt == 1 &&
 2263             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2264             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2265             ("nfs readdirrpc bad uio"));
 2266 
 2267         /*
 2268          * If there is no cookie, assume directory was stale.
 2269          */
 2270         ncl_dircookie_lock(dnp);
 2271         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2272         if (cookiep) {
 2273                 cookie = *cookiep;
 2274                 ncl_dircookie_unlock(dnp);
 2275         } else {
 2276                 ncl_dircookie_unlock(dnp);              
 2277                 return (NFSERR_BAD_COOKIE);
 2278         }
 2279 
 2280         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2281                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2282 
 2283         error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
 2284             &attrflag, &eof, NULL);
 2285         if (attrflag)
 2286                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2287 
 2288         if (!error) {
 2289                 /*
 2290                  * We are now either at the end of the directory or have filled
 2291                  * the block.
 2292                  */
 2293                 if (eof)
 2294                         dnp->n_direofoffset = uiop->uio_offset;
 2295                 else {
 2296                         if (uiop->uio_resid > 0)
 2297                                 ncl_printf("EEK! readdirrpc resid > 0\n");
 2298                         ncl_dircookie_lock(dnp);
 2299                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2300                         *cookiep = cookie;
 2301                         ncl_dircookie_unlock(dnp);
 2302                 }
 2303         } else if (NFS_ISV4(vp)) {
 2304                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2305         }
 2306         return (error);
 2307 }
 2308 
 2309 /*
 2310  * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
 2311  */
 2312 int
 2313 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2314     struct thread *td)
 2315 {
 2316         struct nfsvattr nfsva;
 2317         nfsuint64 *cookiep, cookie;
 2318         struct nfsnode *dnp = VTONFS(vp);
 2319         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2320         int error = 0, attrflag, eof;
 2321 
 2322         KASSERT(uiop->uio_iovcnt == 1 &&
 2323             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2324             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2325             ("nfs readdirplusrpc bad uio"));
 2326 
 2327         /*
 2328          * If there is no cookie, assume directory was stale.
 2329          */
 2330         ncl_dircookie_lock(dnp);
 2331         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2332         if (cookiep) {
 2333                 cookie = *cookiep;
 2334                 ncl_dircookie_unlock(dnp);
 2335         } else {
 2336                 ncl_dircookie_unlock(dnp);
 2337                 return (NFSERR_BAD_COOKIE);
 2338         }
 2339 
 2340         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2341                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2342         error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
 2343             &attrflag, &eof, NULL);
 2344         if (attrflag)
 2345                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2346 
 2347         if (!error) {
 2348                 /*
 2349                  * We are now either at end of the directory or have filled the
 2350                  * the block.
 2351                  */
 2352                 if (eof)
 2353                         dnp->n_direofoffset = uiop->uio_offset;
 2354                 else {
 2355                         if (uiop->uio_resid > 0)
 2356                                 ncl_printf("EEK! readdirplusrpc resid > 0\n");
 2357                         ncl_dircookie_lock(dnp);
 2358                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2359                         *cookiep = cookie;
 2360                         ncl_dircookie_unlock(dnp);
 2361                 }
 2362         } else if (NFS_ISV4(vp)) {
 2363                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2364         }
 2365         return (error);
 2366 }
 2367 
 2368 /*
 2369  * Silly rename. To make the NFS filesystem that is stateless look a little
 2370  * more like the "ufs" a remove of an active vnode is translated to a rename
 2371  * to a funny looking filename that is removed by nfs_inactive on the
 2372  * nfsnode. There is the potential for another process on a different client
 2373  * to create the same funny name between the nfs_lookitup() fails and the
 2374  * nfs_rename() completes, but...
 2375  */
 2376 static int
 2377 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2378 {
 2379         struct sillyrename *sp;
 2380         struct nfsnode *np;
 2381         int error;
 2382         short pid;
 2383         unsigned int lticks;
 2384 
 2385         cache_purge(dvp);
 2386         np = VTONFS(vp);
 2387         KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
 2388         MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
 2389             M_NEWNFSREQ, M_WAITOK);
 2390         sp->s_cred = crhold(cnp->cn_cred);
 2391         sp->s_dvp = dvp;
 2392         VREF(dvp);
 2393 
 2394         /* 
 2395          * Fudge together a funny name.
 2396          * Changing the format of the funny name to accomodate more 
 2397          * sillynames per directory.
 2398          * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 
 2399          * CPU ticks since boot.
 2400          */
 2401         pid = cnp->cn_thread->td_proc->p_pid;
 2402         lticks = (unsigned int)ticks;
 2403         for ( ; ; ) {
 2404                 sp->s_namlen = sprintf(sp->s_name, 
 2405                                        ".nfs.%08x.%04x4.4", lticks, 
 2406                                        pid);
 2407                 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2408                                  cnp->cn_thread, NULL))
 2409                         break;
 2410                 lticks++;
 2411         }
 2412         error = nfs_renameit(dvp, vp, cnp, sp);
 2413         if (error)
 2414                 goto bad;
 2415         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2416                 cnp->cn_thread, &np);
 2417         np->n_sillyrename = sp;
 2418         return (0);
 2419 bad:
 2420         vrele(sp->s_dvp);
 2421         crfree(sp->s_cred);
 2422         free((caddr_t)sp, M_NEWNFSREQ);
 2423         return (error);
 2424 }
 2425 
 2426 /*
 2427  * Look up a file name and optionally either update the file handle or
 2428  * allocate an nfsnode, depending on the value of npp.
 2429  * npp == NULL  --> just do the lookup
 2430  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2431  *                      handled too
 2432  * *npp != NULL --> update the file handle in the vnode
 2433  */
 2434 static int
 2435 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
 2436     struct thread *td, struct nfsnode **npp)
 2437 {
 2438         struct vnode *newvp = NULL, *vp;
 2439         struct nfsnode *np, *dnp = VTONFS(dvp);
 2440         struct nfsfh *nfhp, *onfhp;
 2441         struct nfsvattr nfsva, dnfsva;
 2442         struct componentname cn;
 2443         int error = 0, attrflag, dattrflag;
 2444         u_int hash;
 2445 
 2446         error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
 2447             &nfhp, &attrflag, &dattrflag, NULL);
 2448         if (dattrflag)
 2449                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2450         if (npp && !error) {
 2451                 if (*npp != NULL) {
 2452                     np = *npp;
 2453                     vp = NFSTOV(np);
 2454                     /*
 2455                      * For NFSv4, check to see if it is the same name and
 2456                      * replace the name, if it is different.
 2457                      */
 2458                     if (np->n_v4 != NULL && nfsva.na_type == VREG &&
 2459                         (np->n_v4->n4_namelen != len ||
 2460                          NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
 2461                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
 2462                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2463                          dnp->n_fhp->nfh_len))) {
 2464 #ifdef notdef
 2465 { char nnn[100]; int nnnl;
 2466 nnnl = (len < 100) ? len : 99;
 2467 bcopy(name, nnn, nnnl);
 2468 nnn[nnnl] = '\0';
 2469 printf("replace=%s\n",nnn);
 2470 }
 2471 #endif
 2472                             FREE((caddr_t)np->n_v4, M_NFSV4NODE);
 2473                             MALLOC(np->n_v4, struct nfsv4node *,
 2474                                 sizeof (struct nfsv4node) +
 2475                                 dnp->n_fhp->nfh_len + len - 1,
 2476                                 M_NFSV4NODE, M_WAITOK);
 2477                             np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
 2478                             np->n_v4->n4_namelen = len;
 2479                             NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2480                                 dnp->n_fhp->nfh_len);
 2481                             NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
 2482                     }
 2483                     hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
 2484                         FNV1_32_INIT);
 2485                     onfhp = np->n_fhp;
 2486                     /*
 2487                      * Rehash node for new file handle.
 2488                      */
 2489                     vfs_hash_rehash(vp, hash);
 2490                     np->n_fhp = nfhp;
 2491                     if (onfhp != NULL)
 2492                         FREE((caddr_t)onfhp, M_NFSFH);
 2493                     newvp = NFSTOV(np);
 2494                 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
 2495                     FREE((caddr_t)nfhp, M_NFSFH);
 2496                     VREF(dvp);
 2497                     newvp = dvp;
 2498                 } else {
 2499                     cn.cn_nameptr = name;
 2500                     cn.cn_namelen = len;
 2501                     error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
 2502                         &np, NULL, LK_EXCLUSIVE);
 2503                     if (error)
 2504                         return (error);
 2505                     newvp = NFSTOV(np);
 2506                 }
 2507                 if (!attrflag && *npp == NULL) {
 2508                         if (newvp == dvp)
 2509                                 vrele(newvp);
 2510                         else
 2511                                 vput(newvp);
 2512                         return (ENOENT);
 2513                 }
 2514                 if (attrflag)
 2515                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2516                             0, 1);
 2517         }
 2518         if (npp && *npp == NULL) {
 2519                 if (error) {
 2520                         if (newvp) {
 2521                                 if (newvp == dvp)
 2522                                         vrele(newvp);
 2523                                 else
 2524                                         vput(newvp);
 2525                         }
 2526                 } else
 2527                         *npp = np;
 2528         }
 2529         if (error && NFS_ISV4(dvp))
 2530                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2531         return (error);
 2532 }
 2533 
 2534 /*
 2535  * Nfs Version 3 and 4 commit rpc
 2536  */
 2537 int
 2538 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2539    struct thread *td)
 2540 {
 2541         struct nfsvattr nfsva;
 2542         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2543         int error, attrflag;
 2544         u_char verf[NFSX_VERF];
 2545 
 2546         mtx_lock(&nmp->nm_mtx);
 2547         if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
 2548                 mtx_unlock(&nmp->nm_mtx);
 2549                 return (0);
 2550         }
 2551         mtx_unlock(&nmp->nm_mtx);
 2552         error = nfsrpc_commit(vp, offset, cnt, cred, td, verf, &nfsva,
 2553             &attrflag, NULL);
 2554         if (!error) {
 2555                 mtx_lock(&nmp->nm_mtx);
 2556                 if (NFSBCMP((caddr_t)nmp->nm_verf, verf, NFSX_VERF)) {
 2557                         NFSBCOPY(verf, (caddr_t)nmp->nm_verf, NFSX_VERF);
 2558                         error = NFSERR_STALEWRITEVERF;
 2559                 }
 2560                 mtx_unlock(&nmp->nm_mtx);
 2561                 if (!error && attrflag)
 2562                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
 2563                             0, 1);
 2564         } else if (NFS_ISV4(vp)) {
 2565                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2566         }
 2567         return (error);
 2568 }
 2569 
 2570 /*
 2571  * Strategy routine.
 2572  * For async requests when nfsiod(s) are running, queue the request by
 2573  * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
 2574  * request.
 2575  */
 2576 static int
 2577 nfs_strategy(struct vop_strategy_args *ap)
 2578 {
 2579         struct buf *bp = ap->a_bp;
 2580         struct ucred *cr;
 2581 
 2582         KASSERT(!(bp->b_flags & B_DONE),
 2583             ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2584         BUF_ASSERT_HELD(bp);
 2585 
 2586         if (bp->b_iocmd == BIO_READ)
 2587                 cr = bp->b_rcred;
 2588         else
 2589                 cr = bp->b_wcred;
 2590 
 2591         /*
 2592          * If the op is asynchronous and an i/o daemon is waiting
 2593          * queue the request, wake it up and wait for completion
 2594          * otherwise just do it ourselves.
 2595          */
 2596         if ((bp->b_flags & B_ASYNC) == 0 ||
 2597             ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
 2598                 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
 2599         return (0);
 2600 }
 2601 
 2602 /*
 2603  * fsync vnode op. Just call ncl_flush() with commit == 1.
 2604  */
 2605 /* ARGSUSED */
 2606 static int
 2607 nfs_fsync(struct vop_fsync_args *ap)
 2608 {
 2609 
 2610         if (ap->a_vp->v_type != VREG) {
 2611                 /*
 2612                  * For NFS, metadata is changed synchronously on the server,
 2613                  * so there is nothing to flush. Also, ncl_flush() clears
 2614                  * the NMODIFIED flag and that shouldn't be done here for
 2615                  * directories.
 2616                  */
 2617                 return (0);
 2618         }
 2619         return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0));
 2620 }
 2621 
 2622 /*
 2623  * Flush all the blocks associated with a vnode.
 2624  *      Walk through the buffer pool and push any dirty pages
 2625  *      associated with the vnode.
 2626  * If the called_from_renewthread argument is TRUE, it has been called
 2627  * from the NFSv4 renew thread and, as such, cannot block indefinitely
 2628  * waiting for a buffer write to complete.
 2629  */
 2630 int
 2631 ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td,
 2632     int commit, int called_from_renewthread)
 2633 {
 2634         struct nfsnode *np = VTONFS(vp);
 2635         struct buf *bp;
 2636         int i;
 2637         struct buf *nbp;
 2638         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2639         int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2640         int passone = 1, trycnt = 0;
 2641         u_quad_t off, endoff, toff;
 2642         struct ucred* wcred = NULL;
 2643         struct buf **bvec = NULL;
 2644         struct bufobj *bo;
 2645 #ifndef NFS_COMMITBVECSIZ
 2646 #define NFS_COMMITBVECSIZ       20
 2647 #endif
 2648         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2649         int bvecsize = 0, bveccount;
 2650 
 2651         if (called_from_renewthread != 0)
 2652                 slptimeo = hz;
 2653         if (nmp->nm_flag & NFSMNT_INT)
 2654                 slpflag = NFS_PCATCH;
 2655         if (!commit)
 2656                 passone = 0;
 2657         bo = &vp->v_bufobj;
 2658         /*
 2659          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2660          * server, but has not been committed to stable storage on the server
 2661          * yet. On the first pass, the byte range is worked out and the commit
 2662          * rpc is done. On the second pass, ncl_writebp() is called to do the
 2663          * job.
 2664          */
 2665 again:
 2666         off = (u_quad_t)-1;
 2667         endoff = 0;
 2668         bvecpos = 0;
 2669         if (NFS_ISV34(vp) && commit) {
 2670                 if (bvec != NULL && bvec != bvec_on_stack)
 2671                         free(bvec, M_TEMP);
 2672                 /*
 2673                  * Count up how many buffers waiting for a commit.
 2674                  */
 2675                 bveccount = 0;
 2676                 BO_LOCK(bo);
 2677                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2678                         if (!BUF_ISLOCKED(bp) &&
 2679                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2680                                 == (B_DELWRI | B_NEEDCOMMIT))
 2681                                 bveccount++;
 2682                 }
 2683                 /*
 2684                  * Allocate space to remember the list of bufs to commit.  It is
 2685                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 2686                  * If we can't get memory (for whatever reason), we will end up
 2687                  * committing the buffers one-by-one in the loop below.
 2688                  */
 2689                 if (bveccount > NFS_COMMITBVECSIZ) {
 2690                         /*
 2691                          * Release the vnode interlock to avoid a lock
 2692                          * order reversal.
 2693                          */
 2694                         BO_UNLOCK(bo);
 2695                         bvec = (struct buf **)
 2696                                 malloc(bveccount * sizeof(struct buf *),
 2697                                        M_TEMP, M_NOWAIT);
 2698                         BO_LOCK(bo);
 2699                         if (bvec == NULL) {
 2700                                 bvec = bvec_on_stack;
 2701                                 bvecsize = NFS_COMMITBVECSIZ;
 2702                         } else
 2703                                 bvecsize = bveccount;
 2704                 } else {
 2705                         bvec = bvec_on_stack;
 2706                         bvecsize = NFS_COMMITBVECSIZ;
 2707                 }
 2708                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2709                         if (bvecpos >= bvecsize)
 2710                                 break;
 2711                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2712                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2713                                 continue;
 2714                         }
 2715                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2716                             (B_DELWRI | B_NEEDCOMMIT)) {
 2717                                 BUF_UNLOCK(bp);
 2718                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2719                                 continue;
 2720                         }
 2721                         BO_UNLOCK(bo);
 2722                         bremfree(bp);
 2723                         /*
 2724                          * Work out if all buffers are using the same cred
 2725                          * so we can deal with them all with one commit.
 2726                          *
 2727                          * NOTE: we are not clearing B_DONE here, so we have
 2728                          * to do it later on in this routine if we intend to
 2729                          * initiate I/O on the bp.
 2730                          *
 2731                          * Note: to avoid loopback deadlocks, we do not
 2732                          * assign b_runningbufspace.
 2733                          */
 2734                         if (wcred == NULL)
 2735                                 wcred = bp->b_wcred;
 2736                         else if (wcred != bp->b_wcred)
 2737                                 wcred = NOCRED;
 2738                         vfs_busy_pages(bp, 1);
 2739 
 2740                         BO_LOCK(bo);
 2741                         /*
 2742                          * bp is protected by being locked, but nbp is not
 2743                          * and vfs_busy_pages() may sleep.  We have to
 2744                          * recalculate nbp.
 2745                          */
 2746                         nbp = TAILQ_NEXT(bp, b_bobufs);
 2747 
 2748                         /*
 2749                          * A list of these buffers is kept so that the
 2750                          * second loop knows which buffers have actually
 2751                          * been committed. This is necessary, since there
 2752                          * may be a race between the commit rpc and new
 2753                          * uncommitted writes on the file.
 2754                          */
 2755                         bvec[bvecpos++] = bp;
 2756                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2757                                 bp->b_dirtyoff;
 2758                         if (toff < off)
 2759                                 off = toff;
 2760                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2761                         if (toff > endoff)
 2762                                 endoff = toff;
 2763                 }
 2764                 BO_UNLOCK(bo);
 2765         }
 2766         if (bvecpos > 0) {
 2767                 /*
 2768                  * Commit data on the server, as required.
 2769                  * If all bufs are using the same wcred, then use that with
 2770                  * one call for all of them, otherwise commit each one
 2771                  * separately.
 2772                  */
 2773                 if (wcred != NOCRED)
 2774                         retv = ncl_commit(vp, off, (int)(endoff - off),
 2775                                           wcred, td);
 2776                 else {
 2777                         retv = 0;
 2778                         for (i = 0; i < bvecpos; i++) {
 2779                                 off_t off, size;
 2780                                 bp = bvec[i];
 2781                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2782                                         bp->b_dirtyoff;
 2783                                 size = (u_quad_t)(bp->b_dirtyend
 2784                                                   - bp->b_dirtyoff);
 2785                                 retv = ncl_commit(vp, off, (int)size,
 2786                                                   bp->b_wcred, td);
 2787                                 if (retv) break;
 2788                         }
 2789                 }
 2790 
 2791                 if (retv == NFSERR_STALEWRITEVERF)
 2792                         ncl_clearcommit(vp->v_mount);
 2793 
 2794                 /*
 2795                  * Now, either mark the blocks I/O done or mark the
 2796                  * blocks dirty, depending on whether the commit
 2797                  * succeeded.
 2798                  */
 2799                 for (i = 0; i < bvecpos; i++) {
 2800                         bp = bvec[i];
 2801                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 2802                         if (retv) {
 2803                                 /*
 2804                                  * Error, leave B_DELWRI intact
 2805                                  */
 2806                                 vfs_unbusy_pages(bp);
 2807                                 brelse(bp);
 2808                         } else {
 2809                                 /*
 2810                                  * Success, remove B_DELWRI ( bundirty() ).
 2811                                  *
 2812                                  * b_dirtyoff/b_dirtyend seem to be NFS
 2813                                  * specific.  We should probably move that
 2814                                  * into bundirty(). XXX
 2815                                  */
 2816                                 bufobj_wref(bo);
 2817                                 bp->b_flags |= B_ASYNC;
 2818                                 bundirty(bp);
 2819                                 bp->b_flags &= ~B_DONE;
 2820                                 bp->b_ioflags &= ~BIO_ERROR;
 2821                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2822                                 bufdone(bp);
 2823                         }
 2824                 }
 2825         }
 2826 
 2827         /*
 2828          * Start/do any write(s) that are required.
 2829          */
 2830 loop:
 2831         BO_LOCK(bo);
 2832         TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2833                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2834                         if (waitfor != MNT_WAIT || passone)
 2835                                 continue;
 2836 
 2837                         error = BUF_TIMELOCK(bp,
 2838                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 2839                             BO_MTX(bo), "nfsfsync", slpflag, slptimeo);
 2840                         if (error == 0) {
 2841                                 BUF_UNLOCK(bp);
 2842                                 goto loop;
 2843                         }
 2844                         if (error == ENOLCK) {
 2845                                 error = 0;
 2846                                 goto loop;
 2847                         }
 2848                         if (called_from_renewthread != 0) {
 2849                                 /*
 2850                                  * Return EIO so the flush will be retried
 2851                                  * later.
 2852                                  */
 2853                                 error = EIO;
 2854                                 goto done;
 2855                         }
 2856                         if (newnfs_sigintr(nmp, td)) {
 2857                                 error = EINTR;
 2858                                 goto done;
 2859                         }
 2860                         if (slpflag & PCATCH) {
 2861                                 slpflag = 0;
 2862                                 slptimeo = 2 * hz;
 2863                         }
 2864                         goto loop;
 2865                 }
 2866                 if ((bp->b_flags & B_DELWRI) == 0)
 2867                         panic("nfs_fsync: not dirty");
 2868                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 2869                         BUF_UNLOCK(bp);
 2870                         continue;
 2871                 }
 2872                 BO_UNLOCK(bo);
 2873                 bremfree(bp);
 2874                 if (passone || !commit)
 2875                     bp->b_flags |= B_ASYNC;
 2876                 else
 2877                     bp->b_flags |= B_ASYNC;
 2878                 bwrite(bp);
 2879                 if (newnfs_sigintr(nmp, td)) {
 2880                         error = EINTR;
 2881                         goto done;
 2882                 }
 2883                 goto loop;
 2884         }
 2885         if (passone) {
 2886                 passone = 0;
 2887                 BO_UNLOCK(bo);
 2888                 goto again;
 2889         }
 2890         if (waitfor == MNT_WAIT) {
 2891                 while (bo->bo_numoutput) {
 2892                         error = bufobj_wwait(bo, slpflag, slptimeo);
 2893                         if (error) {
 2894                             BO_UNLOCK(bo);
 2895                             if (called_from_renewthread != 0) {
 2896                                 /*
 2897                                  * Return EIO so that the flush will be
 2898                                  * retried later.
 2899                                  */
 2900                                 error = EIO;
 2901                                 goto done;
 2902                             }
 2903                             error = newnfs_sigintr(nmp, td);
 2904                             if (error)
 2905                                 goto done;
 2906                             if (slpflag & PCATCH) {
 2907                                 slpflag = 0;
 2908                                 slptimeo = 2 * hz;
 2909                             }
 2910                             BO_LOCK(bo);
 2911                         }
 2912                 }
 2913                 if (bo->bo_dirty.bv_cnt != 0 && commit) {
 2914                         BO_UNLOCK(bo);
 2915                         goto loop;
 2916                 }
 2917                 /*
 2918                  * Wait for all the async IO requests to drain
 2919                  */
 2920                 BO_UNLOCK(bo);
 2921                 mtx_lock(&np->n_mtx);
 2922                 while (np->n_directio_asyncwr > 0) {
 2923                         np->n_flag |= NFSYNCWAIT;
 2924                         error = newnfs_msleep(td, &np->n_directio_asyncwr,
 2925                             &np->n_mtx, slpflag | (PRIBIO + 1), 
 2926                             "nfsfsync", 0);
 2927                         if (error) {
 2928                                 if (newnfs_sigintr(nmp, td)) {
 2929                                         mtx_unlock(&np->n_mtx);
 2930                                         error = EINTR;  
 2931                                         goto done;
 2932                                 }
 2933                         }
 2934                 }
 2935                 mtx_unlock(&np->n_mtx);
 2936         } else
 2937                 BO_UNLOCK(bo);
 2938         mtx_lock(&np->n_mtx);
 2939         if (np->n_flag & NWRITEERR) {
 2940                 error = np->n_error;
 2941                 np->n_flag &= ~NWRITEERR;
 2942         }
 2943         if (commit && bo->bo_dirty.bv_cnt == 0 &&
 2944             bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
 2945                 np->n_flag &= ~NMODIFIED;
 2946         mtx_unlock(&np->n_mtx);
 2947 done:
 2948         if (bvec != NULL && bvec != bvec_on_stack)
 2949                 free(bvec, M_TEMP);
 2950         if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
 2951             (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
 2952              np->n_directio_asyncwr != 0) && trycnt++ < 5) {
 2953                 /* try, try again... */
 2954                 passone = 1;
 2955                 wcred = NULL;
 2956                 bvec = NULL;
 2957                 bvecsize = 0;
 2958 printf("try%d\n", trycnt);
 2959                 goto again;
 2960         }
 2961         return (error);
 2962 }
 2963 
 2964 /*
 2965  * NFS advisory byte-level locks.
 2966  */
 2967 static int
 2968 nfs_advlock(struct vop_advlock_args *ap)
 2969 {
 2970         struct vnode *vp = ap->a_vp;
 2971         struct ucred *cred;
 2972         struct nfsnode *np = VTONFS(ap->a_vp);
 2973         struct proc *p = (struct proc *)ap->a_id;
 2974         struct thread *td = curthread;  /* XXX */
 2975         struct vattr va;
 2976         int ret, error = EOPNOTSUPP;
 2977         u_quad_t size;
 2978         
 2979         if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
 2980                 if (vp->v_type != VREG)
 2981                         return (EINVAL);
 2982                 if ((ap->a_flags & F_POSIX) != 0)
 2983                         cred = p->p_ucred;
 2984                 else
 2985                         cred = td->td_ucred;
 2986                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 2987                 if (vp->v_iflag & VI_DOOMED) {
 2988                         NFSVOPUNLOCK(vp, 0);
 2989                         return (EBADF);
 2990                 }
 2991 
 2992                 /*
 2993                  * If this is unlocking a write locked region, flush and
 2994                  * commit them before unlocking. This is required by
 2995                  * RFC3530 Sec. 9.3.2.
 2996                  */
 2997                 if (ap->a_op == F_UNLCK &&
 2998                     nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
 2999                     ap->a_flags))
 3000                         (void) ncl_flush(vp, MNT_WAIT, cred, td, 1, 0);
 3001 
 3002                 /*
 3003                  * Loop around doing the lock op, while a blocking lock
 3004                  * must wait for the lock op to succeed.
 3005                  */
 3006                 do {
 3007                         ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
 3008                             ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
 3009                         if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3010                             ap->a_op == F_SETLK) {
 3011                                 NFSVOPUNLOCK(vp, 0);
 3012                                 error = nfs_catnap(PZERO | PCATCH, ret,
 3013                                     "ncladvl");
 3014                                 if (error)
 3015                                         return (EINTR);
 3016                                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 3017                                 if (vp->v_iflag & VI_DOOMED) {
 3018                                         NFSVOPUNLOCK(vp, 0);
 3019                                         return (EBADF);
 3020                                 }
 3021                         }
 3022                 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3023                      ap->a_op == F_SETLK);
 3024                 if (ret == NFSERR_DENIED) {
 3025                         NFSVOPUNLOCK(vp, 0);
 3026                         return (EAGAIN);
 3027                 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
 3028                         NFSVOPUNLOCK(vp, 0);
 3029                         return (ret);
 3030                 } else if (ret != 0) {
 3031                         NFSVOPUNLOCK(vp, 0);
 3032                         return (EACCES);
 3033                 }
 3034 
 3035                 /*
 3036                  * Now, if we just got a lock, invalidate data in the buffer
 3037                  * cache, as required, so that the coherency conforms with
 3038                  * RFC3530 Sec. 9.3.2.
 3039                  */
 3040                 if (ap->a_op == F_SETLK) {
 3041                         if ((np->n_flag & NMODIFIED) == 0) {
 3042                                 np->n_attrstamp = 0;
 3043                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3044                                 ret = VOP_GETATTR(vp, &va, cred);
 3045                         }
 3046                         if ((np->n_flag & NMODIFIED) || ret ||
 3047                             np->n_change != va.va_filerev) {
 3048                                 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
 3049                                 np->n_attrstamp = 0;
 3050                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3051                                 ret = VOP_GETATTR(vp, &va, cred);
 3052                                 if (!ret) {
 3053                                         np->n_mtime = va.va_mtime;
 3054                                         np->n_change = va.va_filerev;
 3055                                 }
 3056                         }
 3057                 }
 3058                 NFSVOPUNLOCK(vp, 0);
 3059                 return (0);
 3060         } else if (!NFS_ISV4(vp)) {
 3061                 error = NFSVOPLOCK(vp, LK_SHARED);
 3062                 if (error)
 3063                         return (error);
 3064                 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3065                         size = VTONFS(vp)->n_size;
 3066                         NFSVOPUNLOCK(vp, 0);
 3067                         error = lf_advlock(ap, &(vp->v_lockf), size);
 3068                 } else {
 3069                         if (nfs_advlock_p != NULL)
 3070                                 error = nfs_advlock_p(ap);
 3071                         else {
 3072                                 NFSVOPUNLOCK(vp, 0);
 3073                                 error = ENOLCK;
 3074                         }
 3075                 }
 3076         }
 3077         return (error);
 3078 }
 3079 
 3080 /*
 3081  * NFS advisory byte-level locks.
 3082  */
 3083 static int
 3084 nfs_advlockasync(struct vop_advlockasync_args *ap)
 3085 {
 3086         struct vnode *vp = ap->a_vp;
 3087         u_quad_t size;
 3088         int error;
 3089         
 3090         if (NFS_ISV4(vp))
 3091                 return (EOPNOTSUPP);
 3092         error = NFSVOPLOCK(vp, LK_SHARED);
 3093         if (error)
 3094                 return (error);
 3095         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3096                 size = VTONFS(vp)->n_size;
 3097                 NFSVOPUNLOCK(vp, 0);
 3098                 error = lf_advlockasync(ap, &(vp->v_lockf), size);
 3099         } else {
 3100                 NFSVOPUNLOCK(vp, 0);
 3101                 error = EOPNOTSUPP;
 3102         }
 3103         return (error);
 3104 }
 3105 
 3106 /*
 3107  * Print out the contents of an nfsnode.
 3108  */
 3109 static int
 3110 nfs_print(struct vop_print_args *ap)
 3111 {
 3112         struct vnode *vp = ap->a_vp;
 3113         struct nfsnode *np = VTONFS(vp);
 3114 
 3115         ncl_printf("\tfileid %ld fsid 0x%x",
 3116            np->n_vattr.na_fileid, np->n_vattr.na_fsid);
 3117         if (vp->v_type == VFIFO)
 3118                 fifo_printinfo(vp);
 3119         printf("\n");
 3120         return (0);
 3121 }
 3122 
 3123 /*
 3124  * This is the "real" nfs::bwrite(struct buf*).
 3125  * We set B_CACHE if this is a VMIO buffer.
 3126  */
 3127 int
 3128 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
 3129 {
 3130         int s;
 3131         int oldflags = bp->b_flags;
 3132 #if 0
 3133         int retv = 1;
 3134         off_t off;
 3135 #endif
 3136 
 3137         BUF_ASSERT_HELD(bp);
 3138 
 3139         if (bp->b_flags & B_INVAL) {
 3140                 brelse(bp);
 3141                 return(0);
 3142         }
 3143 
 3144         bp->b_flags |= B_CACHE;
 3145 
 3146         /*
 3147          * Undirty the bp.  We will redirty it later if the I/O fails.
 3148          */
 3149 
 3150         s = splbio();
 3151         bundirty(bp);
 3152         bp->b_flags &= ~B_DONE;
 3153         bp->b_ioflags &= ~BIO_ERROR;
 3154         bp->b_iocmd = BIO_WRITE;
 3155 
 3156         bufobj_wref(bp->b_bufobj);
 3157         curthread->td_ru.ru_oublock++;
 3158         splx(s);
 3159 
 3160         /*
 3161          * Note: to avoid loopback deadlocks, we do not
 3162          * assign b_runningbufspace.
 3163          */
 3164         vfs_busy_pages(bp, 1);
 3165 
 3166         BUF_KERNPROC(bp);
 3167         bp->b_iooffset = dbtob(bp->b_blkno);
 3168         bstrategy(bp);
 3169 
 3170         if( (oldflags & B_ASYNC) == 0) {
 3171                 int rtval = bufwait(bp);
 3172 
 3173                 if (oldflags & B_DELWRI) {
 3174                         s = splbio();
 3175                         reassignbuf(bp);
 3176                         splx(s);
 3177                 }
 3178                 brelse(bp);
 3179                 return (rtval);
 3180         }
 3181 
 3182         return (0);
 3183 }
 3184 
 3185 /*
 3186  * nfs special file access vnode op.
 3187  * Essentially just get vattr and then imitate iaccess() since the device is
 3188  * local to the client.
 3189  */
 3190 static int
 3191 nfsspec_access(struct vop_access_args *ap)
 3192 {
 3193         struct vattr *vap;
 3194         struct ucred *cred = ap->a_cred;
 3195         struct vnode *vp = ap->a_vp;
 3196         accmode_t accmode = ap->a_accmode;
 3197         struct vattr vattr;
 3198         int error;
 3199 
 3200         /*
 3201          * Disallow write attempts on filesystems mounted read-only;
 3202          * unless the file is a socket, fifo, or a block or character
 3203          * device resident on the filesystem.
 3204          */
 3205         if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3206                 switch (vp->v_type) {
 3207                 case VREG:
 3208                 case VDIR:
 3209                 case VLNK:
 3210                         return (EROFS);
 3211                 default:
 3212                         break;
 3213                 }
 3214         }
 3215         vap = &vattr;
 3216         error = VOP_GETATTR(vp, vap, cred);
 3217         if (error)
 3218                 goto out;
 3219         error  = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
 3220             accmode, cred, NULL);
 3221 out:
 3222         return error;
 3223 }
 3224 
 3225 /*
 3226  * Read wrapper for fifos.
 3227  */
 3228 static int
 3229 nfsfifo_read(struct vop_read_args *ap)
 3230 {
 3231         struct nfsnode *np = VTONFS(ap->a_vp);
 3232         int error;
 3233 
 3234         /*
 3235          * Set access flag.
 3236          */
 3237         mtx_lock(&np->n_mtx);
 3238         np->n_flag |= NACC;
 3239         vfs_timestamp(&np->n_atim);
 3240         mtx_unlock(&np->n_mtx);
 3241         error = fifo_specops.vop_read(ap);
 3242         return error;   
 3243 }
 3244 
 3245 /*
 3246  * Write wrapper for fifos.
 3247  */
 3248 static int
 3249 nfsfifo_write(struct vop_write_args *ap)
 3250 {
 3251         struct nfsnode *np = VTONFS(ap->a_vp);
 3252 
 3253         /*
 3254          * Set update flag.
 3255          */
 3256         mtx_lock(&np->n_mtx);
 3257         np->n_flag |= NUPD;
 3258         vfs_timestamp(&np->n_mtim);
 3259         mtx_unlock(&np->n_mtx);
 3260         return(fifo_specops.vop_write(ap));
 3261 }
 3262 
 3263 /*
 3264  * Close wrapper for fifos.
 3265  *
 3266  * Update the times on the nfsnode then do fifo close.
 3267  */
 3268 static int
 3269 nfsfifo_close(struct vop_close_args *ap)
 3270 {
 3271         struct vnode *vp = ap->a_vp;
 3272         struct nfsnode *np = VTONFS(vp);
 3273         struct vattr vattr;
 3274         struct timespec ts;
 3275 
 3276         mtx_lock(&np->n_mtx);
 3277         if (np->n_flag & (NACC | NUPD)) {
 3278                 vfs_timestamp(&ts);
 3279                 if (np->n_flag & NACC)
 3280                         np->n_atim = ts;
 3281                 if (np->n_flag & NUPD)
 3282                         np->n_mtim = ts;
 3283                 np->n_flag |= NCHG;
 3284                 if (vrefcnt(vp) == 1 &&
 3285                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3286                         VATTR_NULL(&vattr);
 3287                         if (np->n_flag & NACC)
 3288                                 vattr.va_atime = np->n_atim;
 3289                         if (np->n_flag & NUPD)
 3290                                 vattr.va_mtime = np->n_mtim;
 3291                         mtx_unlock(&np->n_mtx);
 3292                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 3293                         goto out;
 3294                 }
 3295         }
 3296         mtx_unlock(&np->n_mtx);
 3297 out:
 3298         return (fifo_specops.vop_close(ap));
 3299 }
 3300 
 3301 /*
 3302  * Just call ncl_writebp() with the force argument set to 1.
 3303  *
 3304  * NOTE: B_DONE may or may not be set in a_bp on call.
 3305  */
 3306 static int
 3307 nfs_bwrite(struct buf *bp)
 3308 {
 3309 
 3310         return (ncl_writebp(bp, 1, curthread));
 3311 }
 3312 
 3313 struct buf_ops buf_ops_newnfs = {
 3314         .bop_name       =       "buf_ops_nfs",
 3315         .bop_write      =       nfs_bwrite,
 3316         .bop_strategy   =       bufstrategy,
 3317         .bop_sync       =       bufsync,
 3318         .bop_bdflush    =       bufbdflush,
 3319 };
 3320 
 3321 /*
 3322  * Cloned from vop_stdlock(), and then the ugly hack added.
 3323  */
 3324 static int
 3325 nfs_lock1(struct vop_lock1_args *ap)
 3326 {
 3327         struct vnode *vp = ap->a_vp;
 3328         int error = 0;
 3329 
 3330         /*
 3331          * Since vfs_hash_get() calls vget() and it will no longer work
 3332          * for FreeBSD8 with flags == 0, I can only think of this horrible
 3333          * hack to work around it. I call vfs_hash_get() with LK_EXCLOTHER
 3334          * and then handle it here. All I want for this case is a v_usecount
 3335          * on the vnode to use for recovery, while another thread might
 3336          * hold a lock on the vnode. I have the other threads blocked, so
 3337          * there isn't any race problem.
 3338          */
 3339         if ((ap->a_flags & LK_TYPE_MASK) == LK_EXCLOTHER) {
 3340                 if ((ap->a_flags & LK_INTERLOCK) == 0)
 3341                         panic("ncllock1");
 3342                 if ((vp->v_iflag & VI_DOOMED))
 3343                         error = ENOENT;
 3344                 VI_UNLOCK(vp);
 3345                 return (error);
 3346         }
 3347         return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
 3348             LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
 3349             ap->a_line));
 3350 }
 3351 
 3352 static int
 3353 nfs_getacl(struct vop_getacl_args *ap)
 3354 {
 3355         int error;
 3356 
 3357         if (ap->a_type != ACL_TYPE_NFS4)
 3358                 return (EOPNOTSUPP);
 3359         error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3360             NULL);
 3361         if (error > NFSERR_STALE) {
 3362                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3363                 error = EPERM;
 3364         }
 3365         return (error);
 3366 }
 3367 
 3368 static int
 3369 nfs_setacl(struct vop_setacl_args *ap)
 3370 {
 3371         int error;
 3372 
 3373         if (ap->a_type != ACL_TYPE_NFS4)
 3374                 return (EOPNOTSUPP);
 3375         error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3376             NULL);
 3377         if (error > NFSERR_STALE) {
 3378                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3379                 error = EPERM;
 3380         }
 3381         return (error);
 3382 }
 3383 
 3384 /*
 3385  * Return POSIX pathconf information applicable to nfs filesystems.
 3386  */
 3387 static int
 3388 nfs_pathconf(struct vop_pathconf_args *ap)
 3389 {
 3390         struct nfsv3_pathconf pc;
 3391         struct nfsvattr nfsva;
 3392         struct vnode *vp = ap->a_vp;
 3393         struct thread *td = curthread;
 3394         int attrflag, error;
 3395 
 3396         if (NFS_ISV4(vp) || (NFS_ISV3(vp) && (ap->a_name == _PC_LINK_MAX ||
 3397             ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
 3398             ap->a_name == _PC_NO_TRUNC))) {
 3399                 /*
 3400                  * Since only the above 4 a_names are returned by the NFSv3
 3401                  * Pathconf RPC, there is no point in doing it for others.
 3402                  */
 3403                 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
 3404                     &attrflag, NULL);
 3405                 if (attrflag != 0)
 3406                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 3407                             1);
 3408                 if (error != 0)
 3409                         return (error);
 3410         } else {
 3411                 /*
 3412                  * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
 3413                  * just fake them.
 3414                  */
 3415                 pc.pc_linkmax = LINK_MAX;
 3416                 pc.pc_namemax = NFS_MAXNAMLEN;
 3417                 pc.pc_notrunc = 1;
 3418                 pc.pc_chownrestricted = 1;
 3419                 pc.pc_caseinsensitive = 0;
 3420                 pc.pc_casepreserving = 1;
 3421                 error = 0;
 3422         }
 3423         switch (ap->a_name) {
 3424         case _PC_LINK_MAX:
 3425                 *ap->a_retval = pc.pc_linkmax;
 3426                 break;
 3427         case _PC_NAME_MAX:
 3428                 *ap->a_retval = pc.pc_namemax;
 3429                 break;
 3430         case _PC_PATH_MAX:
 3431                 *ap->a_retval = PATH_MAX;
 3432                 break;
 3433         case _PC_PIPE_BUF:
 3434                 *ap->a_retval = PIPE_BUF;
 3435                 break;
 3436         case _PC_CHOWN_RESTRICTED:
 3437                 *ap->a_retval = pc.pc_chownrestricted;
 3438                 break;
 3439         case _PC_NO_TRUNC:
 3440                 *ap->a_retval = pc.pc_notrunc;
 3441                 break;
 3442         case _PC_ACL_EXTENDED:
 3443                 *ap->a_retval = 0;
 3444                 break;
 3445         case _PC_ACL_NFS4:
 3446                 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
 3447                     NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
 3448                         *ap->a_retval = 1;
 3449                 else
 3450                         *ap->a_retval = 0;
 3451                 break;
 3452         case _PC_ACL_PATH_MAX:
 3453                 if (NFS_ISV4(vp))
 3454                         *ap->a_retval = ACL_MAX_ENTRIES;
 3455                 else
 3456                         *ap->a_retval = 3;
 3457                 break;
 3458         case _PC_MAC_PRESENT:
 3459                 *ap->a_retval = 0;
 3460                 break;
 3461         case _PC_ASYNC_IO:
 3462                 /* _PC_ASYNC_IO should have been handled by upper layers. */
 3463                 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
 3464                 error = EINVAL;
 3465                 break;
 3466         case _PC_PRIO_IO:
 3467                 *ap->a_retval = 0;
 3468                 break;
 3469         case _PC_SYNC_IO:
 3470                 *ap->a_retval = 0;
 3471                 break;
 3472         case _PC_ALLOC_SIZE_MIN:
 3473                 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
 3474                 break;
 3475         case _PC_FILESIZEBITS:
 3476                 if (NFS_ISV34(vp))
 3477                         *ap->a_retval = 64;
 3478                 else
 3479                         *ap->a_retval = 32;
 3480                 break;
 3481         case _PC_REC_INCR_XFER_SIZE:
 3482                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3483                 break;
 3484         case _PC_REC_MAX_XFER_SIZE:
 3485                 *ap->a_retval = -1; /* means ``unlimited'' */
 3486                 break;
 3487         case _PC_REC_MIN_XFER_SIZE:
 3488                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3489                 break;
 3490         case _PC_REC_XFER_ALIGN:
 3491                 *ap->a_retval = PAGE_SIZE;
 3492                 break;
 3493         case _PC_SYMLINK_MAX:
 3494                 *ap->a_retval = NFS_MAXPATHLEN;
 3495                 break;
 3496 
 3497         default:
 3498                 error = EINVAL;
 3499                 break;
 3500         }
 3501         return (error);
 3502 }
 3503 

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