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

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from nfs_vnops.c        8.16 (Berkeley) 5/27/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: stable/11/sys/fs/nfsclient/nfs_clvnops.c 357706 2020-02-09 22:15:35Z kevans $");
   37 
   38 /*
   39  * vnode op calls for Sun NFS version 2, 3 and 4
   40  */
   41 
   42 #include "opt_inet.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/kernel.h>
   46 #include <sys/systm.h>
   47 #include <sys/resourcevar.h>
   48 #include <sys/proc.h>
   49 #include <sys/mount.h>
   50 #include <sys/bio.h>
   51 #include <sys/buf.h>
   52 #include <sys/jail.h>
   53 #include <sys/malloc.h>
   54 #include <sys/mbuf.h>
   55 #include <sys/namei.h>
   56 #include <sys/socket.h>
   57 #include <sys/vnode.h>
   58 #include <sys/dirent.h>
   59 #include <sys/fcntl.h>
   60 #include <sys/lockf.h>
   61 #include <sys/stat.h>
   62 #include <sys/sysctl.h>
   63 #include <sys/signalvar.h>
   64 
   65 #include <vm/vm.h>
   66 #include <vm/vm_extern.h>
   67 #include <vm/vm_object.h>
   68 
   69 #include <fs/nfs/nfsport.h>
   70 #include <fs/nfsclient/nfsnode.h>
   71 #include <fs/nfsclient/nfsmount.h>
   72 #include <fs/nfsclient/nfs.h>
   73 #include <fs/nfsclient/nfs_kdtrace.h>
   74 
   75 #include <net/if.h>
   76 #include <netinet/in.h>
   77 #include <netinet/in_var.h>
   78 
   79 #include <nfs/nfs_lock.h>
   80 
   81 #ifdef KDTRACE_HOOKS
   82 #include <sys/dtrace_bsd.h>
   83 
   84 dtrace_nfsclient_accesscache_flush_probe_func_t
   85                 dtrace_nfscl_accesscache_flush_done_probe;
   86 uint32_t        nfscl_accesscache_flush_done_id;
   87 
   88 dtrace_nfsclient_accesscache_get_probe_func_t
   89                 dtrace_nfscl_accesscache_get_hit_probe,
   90                 dtrace_nfscl_accesscache_get_miss_probe;
   91 uint32_t        nfscl_accesscache_get_hit_id;
   92 uint32_t        nfscl_accesscache_get_miss_id;
   93 
   94 dtrace_nfsclient_accesscache_load_probe_func_t
   95                 dtrace_nfscl_accesscache_load_done_probe;
   96 uint32_t        nfscl_accesscache_load_done_id;
   97 #endif /* !KDTRACE_HOOKS */
   98 
   99 /* Defs */
  100 #define TRUE    1
  101 #define FALSE   0
  102 
  103 extern struct nfsstatsv1 nfsstatsv1;
  104 extern int nfsrv_useacl;
  105 extern int nfscl_debuglevel;
  106 MALLOC_DECLARE(M_NEWNFSREQ);
  107 
  108 static vop_read_t       nfsfifo_read;
  109 static vop_write_t      nfsfifo_write;
  110 static vop_close_t      nfsfifo_close;
  111 static int      nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
  112                     struct thread *);
  113 static vop_lookup_t     nfs_lookup;
  114 static vop_create_t     nfs_create;
  115 static vop_mknod_t      nfs_mknod;
  116 static vop_open_t       nfs_open;
  117 static vop_pathconf_t   nfs_pathconf;
  118 static vop_close_t      nfs_close;
  119 static vop_access_t     nfs_access;
  120 static vop_getattr_t    nfs_getattr;
  121 static vop_setattr_t    nfs_setattr;
  122 static vop_read_t       nfs_read;
  123 static vop_fsync_t      nfs_fsync;
  124 static vop_remove_t     nfs_remove;
  125 static vop_link_t       nfs_link;
  126 static vop_rename_t     nfs_rename;
  127 static vop_mkdir_t      nfs_mkdir;
  128 static vop_rmdir_t      nfs_rmdir;
  129 static vop_symlink_t    nfs_symlink;
  130 static vop_readdir_t    nfs_readdir;
  131 static vop_strategy_t   nfs_strategy;
  132 static  int     nfs_lookitup(struct vnode *, char *, int,
  133                     struct ucred *, struct thread *, struct nfsnode **);
  134 static  int     nfs_sillyrename(struct vnode *, struct vnode *,
  135                     struct componentname *);
  136 static vop_access_t     nfsspec_access;
  137 static vop_readlink_t   nfs_readlink;
  138 static vop_print_t      nfs_print;
  139 static vop_advlock_t    nfs_advlock;
  140 static vop_advlockasync_t nfs_advlockasync;
  141 static vop_getacl_t nfs_getacl;
  142 static vop_setacl_t nfs_setacl;
  143 static vop_set_text_t nfs_set_text;
  144 
  145 /*
  146  * Global vfs data structures for nfs
  147  */
  148 struct vop_vector newnfs_vnodeops = {
  149         .vop_default =          &default_vnodeops,
  150         .vop_access =           nfs_access,
  151         .vop_advlock =          nfs_advlock,
  152         .vop_advlockasync =     nfs_advlockasync,
  153         .vop_close =            nfs_close,
  154         .vop_create =           nfs_create,
  155         .vop_fsync =            nfs_fsync,
  156         .vop_getattr =          nfs_getattr,
  157         .vop_getpages =         ncl_getpages,
  158         .vop_putpages =         ncl_putpages,
  159         .vop_inactive =         ncl_inactive,
  160         .vop_link =             nfs_link,
  161         .vop_lookup =           nfs_lookup,
  162         .vop_mkdir =            nfs_mkdir,
  163         .vop_mknod =            nfs_mknod,
  164         .vop_open =             nfs_open,
  165         .vop_pathconf =         nfs_pathconf,
  166         .vop_print =            nfs_print,
  167         .vop_read =             nfs_read,
  168         .vop_readdir =          nfs_readdir,
  169         .vop_readlink =         nfs_readlink,
  170         .vop_reclaim =          ncl_reclaim,
  171         .vop_remove =           nfs_remove,
  172         .vop_rename =           nfs_rename,
  173         .vop_rmdir =            nfs_rmdir,
  174         .vop_setattr =          nfs_setattr,
  175         .vop_strategy =         nfs_strategy,
  176         .vop_symlink =          nfs_symlink,
  177         .vop_write =            ncl_write,
  178         .vop_getacl =           nfs_getacl,
  179         .vop_setacl =           nfs_setacl,
  180         .vop_set_text =         nfs_set_text,
  181 };
  182 
  183 struct vop_vector newnfs_fifoops = {
  184         .vop_default =          &fifo_specops,
  185         .vop_access =           nfsspec_access,
  186         .vop_close =            nfsfifo_close,
  187         .vop_fsync =            nfs_fsync,
  188         .vop_getattr =          nfs_getattr,
  189         .vop_inactive =         ncl_inactive,
  190         .vop_pathconf =         nfs_pathconf,
  191         .vop_print =            nfs_print,
  192         .vop_read =             nfsfifo_read,
  193         .vop_reclaim =          ncl_reclaim,
  194         .vop_setattr =          nfs_setattr,
  195         .vop_write =            nfsfifo_write,
  196 };
  197 
  198 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
  199     struct componentname *cnp, struct vattr *vap);
  200 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
  201     int namelen, struct ucred *cred, struct thread *td);
  202 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
  203     char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
  204     char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
  205 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
  206     struct componentname *scnp, struct sillyrename *sp);
  207 
  208 /*
  209  * Global variables
  210  */
  211 #define DIRHDSIZ        (sizeof (struct dirent) - (MAXNAMLEN + 1))
  212 
  213 SYSCTL_DECL(_vfs_nfs);
  214 
  215 static int      nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
  216 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
  217            &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
  218 
  219 static int      nfs_prime_access_cache = 0;
  220 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
  221            &nfs_prime_access_cache, 0,
  222            "Prime NFS ACCESS cache when fetching attributes");
  223 
  224 static int      newnfs_commit_on_close = 0;
  225 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
  226     &newnfs_commit_on_close, 0, "write+commit on close, else only write");
  227 
  228 static int      nfs_clean_pages_on_close = 1;
  229 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
  230            &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
  231 
  232 int newnfs_directio_enable = 0;
  233 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
  234            &newnfs_directio_enable, 0, "Enable NFS directio");
  235 
  236 int nfs_keep_dirty_on_error;
  237 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
  238     &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
  239 
  240 /*
  241  * This sysctl allows other processes to mmap a file that has been opened
  242  * O_DIRECT by a process.  In general, having processes mmap the file while
  243  * Direct IO is in progress can lead to Data Inconsistencies.  But, we allow
  244  * this by default to prevent DoS attacks - to prevent a malicious user from
  245  * opening up files O_DIRECT preventing other users from mmap'ing these
  246  * files.  "Protected" environments where stricter consistency guarantees are
  247  * required can disable this knob.  The process that opened the file O_DIRECT
  248  * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
  249  * meaningful.
  250  */
  251 int newnfs_directio_allow_mmap = 1;
  252 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
  253            &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
  254 
  255 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY                \
  256                          | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
  257                          | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
  258 
  259 /*
  260  * SMP Locking Note :
  261  * The list of locks after the description of the lock is the ordering
  262  * of other locks acquired with the lock held.
  263  * np->n_mtx : Protects the fields in the nfsnode.
  264        VM Object Lock
  265        VI_MTX (acquired indirectly)
  266  * nmp->nm_mtx : Protects the fields in the nfsmount.
  267        rep->r_mtx
  268  * ncl_iod_mutex : Global lock, protects shared nfsiod state.
  269  * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
  270        nmp->nm_mtx
  271        rep->r_mtx
  272  * rep->r_mtx : Protects the fields in an nfsreq.
  273  */
  274 
  275 static int
  276 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
  277     struct ucred *cred, u_int32_t *retmode)
  278 {
  279         int error = 0, attrflag, i, lrupos;
  280         u_int32_t rmode;
  281         struct nfsnode *np = VTONFS(vp);
  282         struct nfsvattr nfsva;
  283 
  284         error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
  285             &rmode, NULL);
  286         if (attrflag)
  287                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
  288         if (!error) {
  289                 lrupos = 0;
  290                 mtx_lock(&np->n_mtx);
  291                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  292                         if (np->n_accesscache[i].uid == cred->cr_uid) {
  293                                 np->n_accesscache[i].mode = rmode;
  294                                 np->n_accesscache[i].stamp = time_second;
  295                                 break;
  296                         }
  297                         if (i > 0 && np->n_accesscache[i].stamp <
  298                             np->n_accesscache[lrupos].stamp)
  299                                 lrupos = i;
  300                 }
  301                 if (i == NFS_ACCESSCACHESIZE) {
  302                         np->n_accesscache[lrupos].uid = cred->cr_uid;
  303                         np->n_accesscache[lrupos].mode = rmode;
  304                         np->n_accesscache[lrupos].stamp = time_second;
  305                 }
  306                 mtx_unlock(&np->n_mtx);
  307                 if (retmode != NULL)
  308                         *retmode = rmode;
  309                 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
  310         } else if (NFS_ISV4(vp)) {
  311                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  312         }
  313 #ifdef KDTRACE_HOOKS
  314         if (error != 0)
  315                 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
  316                     error);
  317 #endif
  318         return (error);
  319 }
  320 
  321 /*
  322  * nfs access vnode op.
  323  * For nfs version 2, just return ok. File accesses may fail later.
  324  * For nfs version 3, use the access rpc to check accessibility. If file modes
  325  * are changed on the server, accesses might still fail later.
  326  */
  327 static int
  328 nfs_access(struct vop_access_args *ap)
  329 {
  330         struct vnode *vp = ap->a_vp;
  331         int error = 0, i, gotahit;
  332         u_int32_t mode, wmode, rmode;
  333         int v34 = NFS_ISV34(vp);
  334         struct nfsnode *np = VTONFS(vp);
  335 
  336         /*
  337          * Disallow write attempts on filesystems mounted read-only;
  338          * unless the file is a socket, fifo, or a block or character
  339          * device resident on the filesystem.
  340          */
  341         if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
  342             VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
  343             VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
  344                 switch (vp->v_type) {
  345                 case VREG:
  346                 case VDIR:
  347                 case VLNK:
  348                         return (EROFS);
  349                 default:
  350                         break;
  351                 }
  352         }
  353         /*
  354          * For nfs v3 or v4, check to see if we have done this recently, and if
  355          * so return our cached result instead of making an ACCESS call.
  356          * If not, do an access rpc, otherwise you are stuck emulating
  357          * ufs_access() locally using the vattr. This may not be correct,
  358          * since the server may apply other access criteria such as
  359          * client uid-->server uid mapping that we do not know about.
  360          */
  361         if (v34) {
  362                 if (ap->a_accmode & VREAD)
  363                         mode = NFSACCESS_READ;
  364                 else
  365                         mode = 0;
  366                 if (vp->v_type != VDIR) {
  367                         if (ap->a_accmode & VWRITE)
  368                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  369                         if (ap->a_accmode & VAPPEND)
  370                                 mode |= NFSACCESS_EXTEND;
  371                         if (ap->a_accmode & VEXEC)
  372                                 mode |= NFSACCESS_EXECUTE;
  373                         if (ap->a_accmode & VDELETE)
  374                                 mode |= NFSACCESS_DELETE;
  375                 } else {
  376                         if (ap->a_accmode & VWRITE)
  377                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  378                         if (ap->a_accmode & VAPPEND)
  379                                 mode |= NFSACCESS_EXTEND;
  380                         if (ap->a_accmode & VEXEC)
  381                                 mode |= NFSACCESS_LOOKUP;
  382                         if (ap->a_accmode & VDELETE)
  383                                 mode |= NFSACCESS_DELETE;
  384                         if (ap->a_accmode & VDELETE_CHILD)
  385                                 mode |= NFSACCESS_MODIFY;
  386                 }
  387                 /* XXX safety belt, only make blanket request if caching */
  388                 if (nfsaccess_cache_timeout > 0) {
  389                         wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
  390                                 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
  391                                 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
  392                 } else {
  393                         wmode = mode;
  394                 }
  395 
  396                 /*
  397                  * Does our cached result allow us to give a definite yes to
  398                  * this request?
  399                  */
  400                 gotahit = 0;
  401                 mtx_lock(&np->n_mtx);
  402                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  403                         if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
  404                             if (time_second < (np->n_accesscache[i].stamp
  405                                 + nfsaccess_cache_timeout) &&
  406                                 (np->n_accesscache[i].mode & mode) == mode) {
  407                                 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits);
  408                                 gotahit = 1;
  409                             }
  410                             break;
  411                         }
  412                 }
  413                 mtx_unlock(&np->n_mtx);
  414 #ifdef KDTRACE_HOOKS
  415                 if (gotahit != 0)
  416                         KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
  417                             ap->a_cred->cr_uid, mode);
  418                 else
  419                         KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
  420                             ap->a_cred->cr_uid, mode);
  421 #endif
  422                 if (gotahit == 0) {
  423                         /*
  424                          * Either a no, or a don't know.  Go to the wire.
  425                          */
  426                         NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
  427                         error = nfs34_access_otw(vp, wmode, ap->a_td,
  428                             ap->a_cred, &rmode);
  429                         if (!error &&
  430                             (rmode & mode) != mode)
  431                                 error = EACCES;
  432                 }
  433                 return (error);
  434         } else {
  435                 if ((error = nfsspec_access(ap)) != 0) {
  436                         return (error);
  437                 }
  438                 /*
  439                  * Attempt to prevent a mapped root from accessing a file
  440                  * which it shouldn't.  We try to read a byte from the file
  441                  * if the user is root and the file is not zero length.
  442                  * After calling nfsspec_access, we should have the correct
  443                  * file size cached.
  444                  */
  445                 mtx_lock(&np->n_mtx);
  446                 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
  447                     && VTONFS(vp)->n_size > 0) {
  448                         struct iovec aiov;
  449                         struct uio auio;
  450                         char buf[1];
  451 
  452                         mtx_unlock(&np->n_mtx);
  453                         aiov.iov_base = buf;
  454                         aiov.iov_len = 1;
  455                         auio.uio_iov = &aiov;
  456                         auio.uio_iovcnt = 1;
  457                         auio.uio_offset = 0;
  458                         auio.uio_resid = 1;
  459                         auio.uio_segflg = UIO_SYSSPACE;
  460                         auio.uio_rw = UIO_READ;
  461                         auio.uio_td = ap->a_td;
  462 
  463                         if (vp->v_type == VREG)
  464                                 error = ncl_readrpc(vp, &auio, ap->a_cred);
  465                         else if (vp->v_type == VDIR) {
  466                                 char* bp;
  467                                 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
  468                                 aiov.iov_base = bp;
  469                                 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
  470                                 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
  471                                     ap->a_td);
  472                                 free(bp, M_TEMP);
  473                         } else if (vp->v_type == VLNK)
  474                                 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
  475                         else
  476                                 error = EACCES;
  477                 } else
  478                         mtx_unlock(&np->n_mtx);
  479                 return (error);
  480         }
  481 }
  482 
  483 
  484 /*
  485  * nfs open vnode op
  486  * Check to see if the type is ok
  487  * and that deletion is not in progress.
  488  * For paged in text files, you will need to flush the page cache
  489  * if consistency is lost.
  490  */
  491 /* ARGSUSED */
  492 static int
  493 nfs_open(struct vop_open_args *ap)
  494 {
  495         struct vnode *vp = ap->a_vp;
  496         struct nfsnode *np = VTONFS(vp);
  497         struct vattr vattr;
  498         int error;
  499         int fmode = ap->a_mode;
  500         struct ucred *cred;
  501 
  502         if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
  503                 return (EOPNOTSUPP);
  504 
  505         /*
  506          * For NFSv4, we need to do the Open Op before cache validation,
  507          * so that we conform to RFC3530 Sec. 9.3.1.
  508          */
  509         if (NFS_ISV4(vp)) {
  510                 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
  511                 if (error) {
  512                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  513                             (gid_t)0);
  514                         return (error);
  515                 }
  516         }
  517 
  518         /*
  519          * Now, if this Open will be doing reading, re-validate/flush the
  520          * cache, so that Close/Open coherency is maintained.
  521          */
  522         mtx_lock(&np->n_mtx);
  523         if (np->n_flag & NMODIFIED) {
  524                 mtx_unlock(&np->n_mtx);
  525                 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  526                 if (error == EINTR || error == EIO) {
  527                         if (NFS_ISV4(vp))
  528                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  529                         return (error);
  530                 }
  531                 mtx_lock(&np->n_mtx);
  532                 np->n_attrstamp = 0;
  533                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  534                 if (vp->v_type == VDIR)
  535                         np->n_direofoffset = 0;
  536                 mtx_unlock(&np->n_mtx);
  537                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  538                 if (error) {
  539                         if (NFS_ISV4(vp))
  540                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  541                         return (error);
  542                 }
  543                 mtx_lock(&np->n_mtx);
  544                 np->n_mtime = vattr.va_mtime;
  545                 if (NFS_ISV4(vp))
  546                         np->n_change = vattr.va_filerev;
  547         } else {
  548                 mtx_unlock(&np->n_mtx);
  549                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  550                 if (error) {
  551                         if (NFS_ISV4(vp))
  552                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  553                         return (error);
  554                 }
  555                 mtx_lock(&np->n_mtx);
  556                 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
  557                     NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
  558                         if (vp->v_type == VDIR)
  559                                 np->n_direofoffset = 0;
  560                         mtx_unlock(&np->n_mtx);
  561                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  562                         if (error == EINTR || error == EIO) {
  563                                 if (NFS_ISV4(vp))
  564                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  565                                 return (error);
  566                         }
  567                         mtx_lock(&np->n_mtx);
  568                         np->n_mtime = vattr.va_mtime;
  569                         if (NFS_ISV4(vp))
  570                                 np->n_change = vattr.va_filerev;
  571                 }
  572         }
  573 
  574         /*
  575          * If the object has >= 1 O_DIRECT active opens, we disable caching.
  576          */
  577         if (newnfs_directio_enable && (fmode & O_DIRECT) &&
  578             (vp->v_type == VREG)) {
  579                 if (np->n_directio_opens == 0) {
  580                         mtx_unlock(&np->n_mtx);
  581                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  582                         if (error) {
  583                                 if (NFS_ISV4(vp))
  584                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  585                                 return (error);
  586                         }
  587                         mtx_lock(&np->n_mtx);
  588                         np->n_flag |= NNONCACHE;
  589                 }
  590                 np->n_directio_opens++;
  591         }
  592 
  593         /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */
  594         if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0)
  595                 np->n_flag |= NWRITEOPENED;
  596 
  597         /*
  598          * If this is an open for writing, capture a reference to the
  599          * credentials, so they can be used by ncl_putpages(). Using
  600          * these write credentials is preferable to the credentials of
  601          * whatever thread happens to be doing the VOP_PUTPAGES() since
  602          * the write RPCs are less likely to fail with EACCES.
  603          */
  604         if ((fmode & FWRITE) != 0) {
  605                 cred = np->n_writecred;
  606                 np->n_writecred = crhold(ap->a_cred);
  607         } else
  608                 cred = NULL;
  609         mtx_unlock(&np->n_mtx);
  610 
  611         if (cred != NULL)
  612                 crfree(cred);
  613         vnode_create_vobject(vp, vattr.va_size, ap->a_td);
  614         return (0);
  615 }
  616 
  617 /*
  618  * nfs close vnode op
  619  * What an NFS client should do upon close after writing is a debatable issue.
  620  * Most NFS clients push delayed writes to the server upon close, basically for
  621  * two reasons:
  622  * 1 - So that any write errors may be reported back to the client process
  623  *     doing the close system call. By far the two most likely errors are
  624  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
  625  * 2 - To put a worst case upper bound on cache inconsistency between
  626  *     multiple clients for the file.
  627  * There is also a consistency problem for Version 2 of the protocol w.r.t.
  628  * not being able to tell if other clients are writing a file concurrently,
  629  * since there is no way of knowing if the changed modify time in the reply
  630  * is only due to the write for this client.
  631  * (NFS Version 3 provides weak cache consistency data in the reply that
  632  *  should be sufficient to detect and handle this case.)
  633  *
  634  * The current code does the following:
  635  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
  636  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
  637  *                     or commit them (this satisfies 1 and 2 except for the
  638  *                     case where the server crashes after this close but
  639  *                     before the commit RPC, which is felt to be "good
  640  *                     enough". Changing the last argument to ncl_flush() to
  641  *                     a 1 would force a commit operation, if it is felt a
  642  *                     commit is necessary now.
  643  * for NFS Version 4 - flush the dirty buffers and commit them, if
  644  *                     nfscl_mustflush() says this is necessary.
  645  *                     It is necessary if there is no write delegation held,
  646  *                     in order to satisfy open/close coherency.
  647  *                     If the file isn't cached on local stable storage,
  648  *                     it may be necessary in order to detect "out of space"
  649  *                     errors from the server, if the write delegation
  650  *                     issued by the server doesn't allow the file to grow.
  651  */
  652 /* ARGSUSED */
  653 static int
  654 nfs_close(struct vop_close_args *ap)
  655 {
  656         struct vnode *vp = ap->a_vp;
  657         struct nfsnode *np = VTONFS(vp);
  658         struct nfsvattr nfsva;
  659         struct ucred *cred;
  660         int error = 0, ret, localcred = 0;
  661         int fmode = ap->a_fflag;
  662 
  663         if (NFSCL_FORCEDISM(vp->v_mount))
  664                 return (0);
  665         /*
  666          * During shutdown, a_cred isn't valid, so just use root.
  667          */
  668         if (ap->a_cred == NOCRED) {
  669                 cred = newnfs_getcred();
  670                 localcred = 1;
  671         } else {
  672                 cred = ap->a_cred;
  673         }
  674         if (vp->v_type == VREG) {
  675             /*
  676              * Examine and clean dirty pages, regardless of NMODIFIED.
  677              * This closes a major hole in close-to-open consistency.
  678              * We want to push out all dirty pages (and buffers) on
  679              * close, regardless of whether they were dirtied by
  680              * mmap'ed writes or via write().
  681              */
  682             if (nfs_clean_pages_on_close && vp->v_object) {
  683                 VM_OBJECT_WLOCK(vp->v_object);
  684                 vm_object_page_clean(vp->v_object, 0, 0, 0);
  685                 VM_OBJECT_WUNLOCK(vp->v_object);
  686             }
  687             mtx_lock(&np->n_mtx);
  688             if (np->n_flag & NMODIFIED) {
  689                 mtx_unlock(&np->n_mtx);
  690                 if (NFS_ISV3(vp)) {
  691                     /*
  692                      * Under NFSv3 we have dirty buffers to dispose of.  We
  693                      * must flush them to the NFS server.  We have the option
  694                      * of waiting all the way through the commit rpc or just
  695                      * waiting for the initial write.  The default is to only
  696                      * wait through the initial write so the data is in the
  697                      * server's cache, which is roughly similar to the state
  698                      * a standard disk subsystem leaves the file in on close().
  699                      *
  700                      * We cannot clear the NMODIFIED bit in np->n_flag due to
  701                      * potential races with other processes, and certainly
  702                      * cannot clear it if we don't commit.
  703                      * These races occur when there is no longer the old
  704                      * traditional vnode locking implemented for Vnode Ops.
  705                      */
  706                     int cm = newnfs_commit_on_close ? 1 : 0;
  707                     error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0);
  708                     /* np->n_flag &= ~NMODIFIED; */
  709                 } else if (NFS_ISV4(vp)) { 
  710                         if (nfscl_mustflush(vp) != 0) {
  711                                 int cm = newnfs_commit_on_close ? 1 : 0;
  712                                 error = ncl_flush(vp, MNT_WAIT, ap->a_td,
  713                                     cm, 0);
  714                                 /*
  715                                  * as above w.r.t races when clearing
  716                                  * NMODIFIED.
  717                                  * np->n_flag &= ~NMODIFIED;
  718                                  */
  719                         }
  720                 } else {
  721                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  722                 }
  723                 mtx_lock(&np->n_mtx);
  724             }
  725             /* 
  726              * Invalidate the attribute cache in all cases.
  727              * An open is going to fetch fresh attrs any way, other procs
  728              * on this node that have file open will be forced to do an 
  729              * otw attr fetch, but this is safe.
  730              * --> A user found that their RPC count dropped by 20% when
  731              *     this was commented out and I can't see any requirement
  732              *     for it, so I've disabled it when negative lookups are
  733              *     enabled. (What does this have to do with negative lookup
  734              *     caching? Well nothing, except it was reported by the
  735              *     same user that needed negative lookup caching and I wanted
  736              *     there to be a way to disable it to see if it
  737              *     is the cause of some caching/coherency issue that might
  738              *     crop up.)
  739              */
  740             if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) {
  741                     np->n_attrstamp = 0;
  742                     KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  743             }
  744             if (np->n_flag & NWRITEERR) {
  745                 np->n_flag &= ~NWRITEERR;
  746                 error = np->n_error;
  747             }
  748             mtx_unlock(&np->n_mtx);
  749         }
  750 
  751         if (NFS_ISV4(vp)) {
  752                 /*
  753                  * Get attributes so "change" is up to date.
  754                  */
  755                 if (error == 0 && nfscl_mustflush(vp) != 0 &&
  756                     vp->v_type == VREG &&
  757                     (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) {
  758                         ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
  759                             NULL);
  760                         if (!ret) {
  761                                 np->n_change = nfsva.na_filerev;
  762                                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
  763                                     NULL, 0, 0);
  764                         }
  765                 }
  766 
  767                 /*
  768                  * and do the close.
  769                  */
  770                 ret = nfsrpc_close(vp, 0, ap->a_td);
  771                 if (!error && ret)
  772                         error = ret;
  773                 if (error)
  774                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  775                             (gid_t)0);
  776         }
  777         if (newnfs_directio_enable)
  778                 KASSERT((np->n_directio_asyncwr == 0),
  779                         ("nfs_close: dirty unflushed (%d) directio buffers\n",
  780                          np->n_directio_asyncwr));
  781         if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  782                 mtx_lock(&np->n_mtx);
  783                 KASSERT((np->n_directio_opens > 0), 
  784                         ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
  785                 np->n_directio_opens--;
  786                 if (np->n_directio_opens == 0)
  787                         np->n_flag &= ~NNONCACHE;
  788                 mtx_unlock(&np->n_mtx);
  789         }
  790         if (localcred)
  791                 NFSFREECRED(cred);
  792         return (error);
  793 }
  794 
  795 /*
  796  * nfs getattr call from vfs.
  797  */
  798 static int
  799 nfs_getattr(struct vop_getattr_args *ap)
  800 {
  801         struct vnode *vp = ap->a_vp;
  802         struct thread *td = curthread;  /* XXX */
  803         struct nfsnode *np = VTONFS(vp);
  804         int error = 0;
  805         struct nfsvattr nfsva;
  806         struct vattr *vap = ap->a_vap;
  807         struct vattr vattr;
  808 
  809         /*
  810          * Update local times for special files.
  811          */
  812         mtx_lock(&np->n_mtx);
  813         if (np->n_flag & (NACC | NUPD))
  814                 np->n_flag |= NCHG;
  815         mtx_unlock(&np->n_mtx);
  816         /*
  817          * First look in the cache.
  818          */
  819         if (ncl_getattrcache(vp, &vattr) == 0) {
  820                 vap->va_type = vattr.va_type;
  821                 vap->va_mode = vattr.va_mode;
  822                 vap->va_nlink = vattr.va_nlink;
  823                 vap->va_uid = vattr.va_uid;
  824                 vap->va_gid = vattr.va_gid;
  825                 vap->va_fsid = vattr.va_fsid;
  826                 vap->va_fileid = vattr.va_fileid;
  827                 vap->va_size = vattr.va_size;
  828                 vap->va_blocksize = vattr.va_blocksize;
  829                 vap->va_atime = vattr.va_atime;
  830                 vap->va_mtime = vattr.va_mtime;
  831                 vap->va_ctime = vattr.va_ctime;
  832                 vap->va_gen = vattr.va_gen;
  833                 vap->va_flags = vattr.va_flags;
  834                 vap->va_rdev = vattr.va_rdev;
  835                 vap->va_bytes = vattr.va_bytes;
  836                 vap->va_filerev = vattr.va_filerev;
  837                 /*
  838                  * Get the local modify time for the case of a write
  839                  * delegation.
  840                  */
  841                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  842                 return (0);
  843         }
  844 
  845         if (NFS_ISV34(vp) && nfs_prime_access_cache &&
  846             nfsaccess_cache_timeout > 0) {
  847                 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
  848                 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
  849                 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
  850                         nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
  851                         return (0);
  852                 }
  853         }
  854         error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
  855         if (!error)
  856                 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
  857         if (!error) {
  858                 /*
  859                  * Get the local modify time for the case of a write
  860                  * delegation.
  861                  */
  862                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  863         } else if (NFS_ISV4(vp)) {
  864                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  865         }
  866         return (error);
  867 }
  868 
  869 /*
  870  * nfs setattr call.
  871  */
  872 static int
  873 nfs_setattr(struct vop_setattr_args *ap)
  874 {
  875         struct vnode *vp = ap->a_vp;
  876         struct nfsnode *np = VTONFS(vp);
  877         struct thread *td = curthread;  /* XXX */
  878         struct vattr *vap = ap->a_vap;
  879         int error = 0;
  880         u_quad_t tsize;
  881 
  882 #ifndef nolint
  883         tsize = (u_quad_t)0;
  884 #endif
  885 
  886         /*
  887          * Setting of flags and marking of atimes are not supported.
  888          */
  889         if (vap->va_flags != VNOVAL)
  890                 return (EOPNOTSUPP);
  891 
  892         /*
  893          * Disallow write attempts if the filesystem is mounted read-only.
  894          */
  895         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  896             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  897             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  898             (vp->v_mount->mnt_flag & MNT_RDONLY))
  899                 return (EROFS);
  900         if (vap->va_size != VNOVAL) {
  901                 switch (vp->v_type) {
  902                 case VDIR:
  903                         return (EISDIR);
  904                 case VCHR:
  905                 case VBLK:
  906                 case VSOCK:
  907                 case VFIFO:
  908                         if (vap->va_mtime.tv_sec == VNOVAL &&
  909                             vap->va_atime.tv_sec == VNOVAL &&
  910                             vap->va_mode == (mode_t)VNOVAL &&
  911                             vap->va_uid == (uid_t)VNOVAL &&
  912                             vap->va_gid == (gid_t)VNOVAL)
  913                                 return (0);             
  914                         vap->va_size = VNOVAL;
  915                         break;
  916                 default:
  917                         /*
  918                          * Disallow write attempts if the filesystem is
  919                          * mounted read-only.
  920                          */
  921                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  922                                 return (EROFS);
  923                         /*
  924                          *  We run vnode_pager_setsize() early (why?),
  925                          * we must set np->n_size now to avoid vinvalbuf
  926                          * V_SAVE races that might setsize a lower
  927                          * value.
  928                          */
  929                         mtx_lock(&np->n_mtx);
  930                         tsize = np->n_size;
  931                         mtx_unlock(&np->n_mtx);
  932                         error = ncl_meta_setsize(vp, td, vap->va_size);
  933                         mtx_lock(&np->n_mtx);
  934                         if (np->n_flag & NMODIFIED) {
  935                             tsize = np->n_size;
  936                             mtx_unlock(&np->n_mtx);
  937                             error = ncl_vinvalbuf(vp, vap->va_size == 0 ?
  938                                 0 : V_SAVE, td, 1);
  939                             if (error != 0) {
  940                                     vnode_pager_setsize(vp, tsize);
  941                                     return (error);
  942                             }
  943                             /*
  944                              * Call nfscl_delegmodtime() to set the modify time
  945                              * locally, as required.
  946                              */
  947                             nfscl_delegmodtime(vp);
  948                         } else
  949                             mtx_unlock(&np->n_mtx);
  950                         /*
  951                          * np->n_size has already been set to vap->va_size
  952                          * in ncl_meta_setsize(). We must set it again since
  953                          * nfs_loadattrcache() could be called through
  954                          * ncl_meta_setsize() and could modify np->n_size.
  955                          */
  956                         mtx_lock(&np->n_mtx);
  957                         np->n_vattr.na_size = np->n_size = vap->va_size;
  958                         mtx_unlock(&np->n_mtx);
  959                 }
  960         } else {
  961                 mtx_lock(&np->n_mtx);
  962                 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 
  963                     (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
  964                         mtx_unlock(&np->n_mtx);
  965                         error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
  966                         if (error == EINTR || error == EIO)
  967                                 return (error);
  968                 } else
  969                         mtx_unlock(&np->n_mtx);
  970         }
  971         error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
  972         if (error && vap->va_size != VNOVAL) {
  973                 mtx_lock(&np->n_mtx);
  974                 np->n_size = np->n_vattr.na_size = tsize;
  975                 vnode_pager_setsize(vp, tsize);
  976                 mtx_unlock(&np->n_mtx);
  977         }
  978         return (error);
  979 }
  980 
  981 /*
  982  * Do an nfs setattr rpc.
  983  */
  984 static int
  985 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
  986     struct thread *td)
  987 {
  988         struct nfsnode *np = VTONFS(vp);
  989         int error, ret, attrflag, i;
  990         struct nfsvattr nfsva;
  991 
  992         if (NFS_ISV34(vp)) {
  993                 mtx_lock(&np->n_mtx);
  994                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  995                         np->n_accesscache[i].stamp = 0;
  996                 np->n_flag |= NDELEGMOD;
  997                 mtx_unlock(&np->n_mtx);
  998                 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
  999         }
 1000         error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
 1001             NULL);
 1002         if (attrflag) {
 1003                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1004                 if (ret && !error)
 1005                         error = ret;
 1006         }
 1007         if (error && NFS_ISV4(vp))
 1008                 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
 1009         return (error);
 1010 }
 1011 
 1012 /*
 1013  * nfs lookup call, one step at a time...
 1014  * First look in cache
 1015  * If not found, unlock the directory nfsnode and do the rpc
 1016  */
 1017 static int
 1018 nfs_lookup(struct vop_lookup_args *ap)
 1019 {
 1020         struct componentname *cnp = ap->a_cnp;
 1021         struct vnode *dvp = ap->a_dvp;
 1022         struct vnode **vpp = ap->a_vpp;
 1023         struct mount *mp = dvp->v_mount;
 1024         int flags = cnp->cn_flags;
 1025         struct vnode *newvp;
 1026         struct nfsmount *nmp;
 1027         struct nfsnode *np, *newnp;
 1028         int error = 0, attrflag, dattrflag, ltype, ncticks;
 1029         struct thread *td = cnp->cn_thread;
 1030         struct nfsfh *nfhp;
 1031         struct nfsvattr dnfsva, nfsva;
 1032         struct vattr vattr;
 1033         struct timespec nctime;
 1034         
 1035         *vpp = NULLVP;
 1036         if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
 1037             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
 1038                 return (EROFS);
 1039         if (dvp->v_type != VDIR)
 1040                 return (ENOTDIR);
 1041         nmp = VFSTONFS(mp);
 1042         np = VTONFS(dvp);
 1043 
 1044         /* For NFSv4, wait until any remove is done. */
 1045         mtx_lock(&np->n_mtx);
 1046         while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
 1047                 np->n_flag |= NREMOVEWANT;
 1048                 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
 1049         }
 1050         mtx_unlock(&np->n_mtx);
 1051 
 1052         error = vn_dir_check_exec(dvp, cnp);
 1053         if (error != 0)
 1054                 return (error);
 1055         error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
 1056         if (error > 0 && error != ENOENT)
 1057                 return (error);
 1058         if (error == -1) {
 1059                 /*
 1060                  * Lookups of "." are special and always return the
 1061                  * current directory.  cache_lookup() already handles
 1062                  * associated locking bookkeeping, etc.
 1063                  */
 1064                 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
 1065                         /* XXX: Is this really correct? */
 1066                         if (cnp->cn_nameiop != LOOKUP &&
 1067                             (flags & ISLASTCN))
 1068                                 cnp->cn_flags |= SAVENAME;
 1069                         return (0);
 1070                 }
 1071 
 1072                 /*
 1073                  * We only accept a positive hit in the cache if the
 1074                  * change time of the file matches our cached copy.
 1075                  * Otherwise, we discard the cache entry and fallback
 1076                  * to doing a lookup RPC.  We also only trust cache
 1077                  * entries for less than nm_nametimeo seconds.
 1078                  *
 1079                  * To better handle stale file handles and attributes,
 1080                  * clear the attribute cache of this node if it is a
 1081                  * leaf component, part of an open() call, and not
 1082                  * locally modified before fetching the attributes.
 1083                  * This should allow stale file handles to be detected
 1084                  * here where we can fall back to a LOOKUP RPC to
 1085                  * recover rather than having nfs_open() detect the
 1086                  * stale file handle and failing open(2) with ESTALE.
 1087                  */
 1088                 newvp = *vpp;
 1089                 newnp = VTONFS(newvp);
 1090                 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
 1091                     (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1092                     !(newnp->n_flag & NMODIFIED)) {
 1093                         mtx_lock(&newnp->n_mtx);
 1094                         newnp->n_attrstamp = 0;
 1095                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1096                         mtx_unlock(&newnp->n_mtx);
 1097                 }
 1098                 if (nfscl_nodeleg(newvp, 0) == 0 ||
 1099                     ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
 1100                     VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
 1101                     timespeccmp(&vattr.va_ctime, &nctime, ==))) {
 1102                         NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
 1103                         if (cnp->cn_nameiop != LOOKUP &&
 1104                             (flags & ISLASTCN))
 1105                                 cnp->cn_flags |= SAVENAME;
 1106                         return (0);
 1107                 }
 1108                 cache_purge(newvp);
 1109                 if (dvp != newvp)
 1110                         vput(newvp);
 1111                 else 
 1112                         vrele(newvp);
 1113                 *vpp = NULLVP;
 1114         } else if (error == ENOENT) {
 1115                 if (dvp->v_iflag & VI_DOOMED)
 1116                         return (ENOENT);
 1117                 /*
 1118                  * We only accept a negative hit in the cache if the
 1119                  * modification time of the parent directory matches
 1120                  * the cached copy in the name cache entry.
 1121                  * Otherwise, we discard all of the negative cache
 1122                  * entries for this directory.  We also only trust
 1123                  * negative cache entries for up to nm_negnametimeo
 1124                  * seconds.
 1125                  */
 1126                 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
 1127                     VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
 1128                     timespeccmp(&vattr.va_mtime, &nctime, ==)) {
 1129                         NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
 1130                         return (ENOENT);
 1131                 }
 1132                 cache_purge_negative(dvp);
 1133         }
 1134 
 1135         error = 0;
 1136         newvp = NULLVP;
 1137         NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses);
 1138         error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1139             cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1140             NULL);
 1141         if (dattrflag)
 1142                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1143         if (error) {
 1144                 if (newvp != NULLVP) {
 1145                         vput(newvp);
 1146                         *vpp = NULLVP;
 1147                 }
 1148 
 1149                 if (error != ENOENT) {
 1150                         if (NFS_ISV4(dvp))
 1151                                 error = nfscl_maperr(td, error, (uid_t)0,
 1152                                     (gid_t)0);
 1153                         return (error);
 1154                 }
 1155 
 1156                 /* The requested file was not found. */
 1157                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 1158                     (flags & ISLASTCN)) {
 1159                         /*
 1160                          * XXX: UFS does a full VOP_ACCESS(dvp,
 1161                          * VWRITE) here instead of just checking
 1162                          * MNT_RDONLY.
 1163                          */
 1164                         if (mp->mnt_flag & MNT_RDONLY)
 1165                                 return (EROFS);
 1166                         cnp->cn_flags |= SAVENAME;
 1167                         return (EJUSTRETURN);
 1168                 }
 1169 
 1170                 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) {
 1171                         /*
 1172                          * Cache the modification time of the parent
 1173                          * directory from the post-op attributes in
 1174                          * the name cache entry.  The negative cache
 1175                          * entry will be ignored once the directory
 1176                          * has changed.  Don't bother adding the entry
 1177                          * if the directory has already changed.
 1178                          */
 1179                         mtx_lock(&np->n_mtx);
 1180                         if (timespeccmp(&np->n_vattr.na_mtime,
 1181                             &dnfsva.na_mtime, ==)) {
 1182                                 mtx_unlock(&np->n_mtx);
 1183                                 cache_enter_time(dvp, NULL, cnp,
 1184                                     &dnfsva.na_mtime, NULL);
 1185                         } else
 1186                                 mtx_unlock(&np->n_mtx);
 1187                 }
 1188                 return (ENOENT);
 1189         }
 1190 
 1191         /*
 1192          * Handle RENAME case...
 1193          */
 1194         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 1195                 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1196                         FREE((caddr_t)nfhp, M_NFSFH);
 1197                         return (EISDIR);
 1198                 }
 1199                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1200                     LK_EXCLUSIVE);
 1201                 if (error)
 1202                         return (error);
 1203                 newvp = NFSTOV(np);
 1204                 if (attrflag)
 1205                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1206                             0, 1);
 1207                 *vpp = newvp;
 1208                 cnp->cn_flags |= SAVENAME;
 1209                 return (0);
 1210         }
 1211 
 1212         if (flags & ISDOTDOT) {
 1213                 ltype = NFSVOPISLOCKED(dvp);
 1214                 error = vfs_busy(mp, MBF_NOWAIT);
 1215                 if (error != 0) {
 1216                         vfs_ref(mp);
 1217                         NFSVOPUNLOCK(dvp, 0);
 1218                         error = vfs_busy(mp, 0);
 1219                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1220                         vfs_rel(mp);
 1221                         if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
 1222                                 vfs_unbusy(mp);
 1223                                 error = ENOENT;
 1224                         }
 1225                         if (error != 0)
 1226                                 return (error);
 1227                 }
 1228                 NFSVOPUNLOCK(dvp, 0);
 1229                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1230                     cnp->cn_lkflags);
 1231                 if (error == 0)
 1232                         newvp = NFSTOV(np);
 1233                 vfs_unbusy(mp);
 1234                 if (newvp != dvp)
 1235                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1236                 if (dvp->v_iflag & VI_DOOMED) {
 1237                         if (error == 0) {
 1238                                 if (newvp == dvp)
 1239                                         vrele(newvp);
 1240                                 else
 1241                                         vput(newvp);
 1242                         }
 1243                         error = ENOENT;
 1244                 }
 1245                 if (error != 0)
 1246                         return (error);
 1247                 if (attrflag)
 1248                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1249                             0, 1);
 1250         } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1251                 FREE((caddr_t)nfhp, M_NFSFH);
 1252                 VREF(dvp);
 1253                 newvp = dvp;
 1254                 if (attrflag)
 1255                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1256                             0, 1);
 1257         } else {
 1258                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1259                     cnp->cn_lkflags);
 1260                 if (error)
 1261                         return (error);
 1262                 newvp = NFSTOV(np);
 1263                 if (attrflag)
 1264                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1265                             0, 1);
 1266                 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1267                     !(np->n_flag & NMODIFIED)) {                        
 1268                         /*
 1269                          * Flush the attribute cache when opening a
 1270                          * leaf node to ensure that fresh attributes
 1271                          * are fetched in nfs_open() since we did not
 1272                          * fetch attributes from the LOOKUP reply.
 1273                          */
 1274                         mtx_lock(&np->n_mtx);
 1275                         np->n_attrstamp = 0;
 1276                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1277                         mtx_unlock(&np->n_mtx);
 1278                 }
 1279         }
 1280         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1281                 cnp->cn_flags |= SAVENAME;
 1282         if ((cnp->cn_flags & MAKEENTRY) &&
 1283             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
 1284             attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
 1285                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1286                     newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
 1287         *vpp = newvp;
 1288         return (0);
 1289 }
 1290 
 1291 /*
 1292  * nfs read call.
 1293  * Just call ncl_bioread() to do the work.
 1294  */
 1295 static int
 1296 nfs_read(struct vop_read_args *ap)
 1297 {
 1298         struct vnode *vp = ap->a_vp;
 1299 
 1300         switch (vp->v_type) {
 1301         case VREG:
 1302                 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1303         case VDIR:
 1304                 return (EISDIR);
 1305         default:
 1306                 return (EOPNOTSUPP);
 1307         }
 1308 }
 1309 
 1310 /*
 1311  * nfs readlink call
 1312  */
 1313 static int
 1314 nfs_readlink(struct vop_readlink_args *ap)
 1315 {
 1316         struct vnode *vp = ap->a_vp;
 1317 
 1318         if (vp->v_type != VLNK)
 1319                 return (EINVAL);
 1320         return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1321 }
 1322 
 1323 /*
 1324  * Do a readlink rpc.
 1325  * Called by ncl_doio() from below the buffer cache.
 1326  */
 1327 int
 1328 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1329 {
 1330         int error, ret, attrflag;
 1331         struct nfsvattr nfsva;
 1332 
 1333         error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
 1334             &attrflag, NULL);
 1335         if (attrflag) {
 1336                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1337                 if (ret && !error)
 1338                         error = ret;
 1339         }
 1340         if (error && NFS_ISV4(vp))
 1341                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1342         return (error);
 1343 }
 1344 
 1345 /*
 1346  * nfs read rpc call
 1347  * Ditto above
 1348  */
 1349 int
 1350 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1351 {
 1352         int error, ret, attrflag;
 1353         struct nfsvattr nfsva;
 1354         struct nfsmount *nmp;
 1355 
 1356         nmp = VFSTONFS(vnode_mount(vp));
 1357         error = EIO;
 1358         attrflag = 0;
 1359         if (NFSHASPNFS(nmp))
 1360                 error = nfscl_doiods(vp, uiop, NULL, NULL,
 1361                     NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td);
 1362         NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
 1363         if (error != 0)
 1364                 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
 1365                     &attrflag, NULL);
 1366         if (attrflag) {
 1367                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1368                 if (ret && !error)
 1369                         error = ret;
 1370         }
 1371         if (error && NFS_ISV4(vp))
 1372                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1373         return (error);
 1374 }
 1375 
 1376 /*
 1377  * nfs write call
 1378  */
 1379 int
 1380 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1381     int *iomode, int *must_commit, int called_from_strategy)
 1382 {
 1383         struct nfsvattr nfsva;
 1384         int error, attrflag, ret;
 1385         struct nfsmount *nmp;
 1386 
 1387         nmp = VFSTONFS(vnode_mount(vp));
 1388         error = EIO;
 1389         attrflag = 0;
 1390         if (NFSHASPNFS(nmp))
 1391                 error = nfscl_doiods(vp, uiop, iomode, must_commit,
 1392                     NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td);
 1393         NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
 1394         if (error != 0)
 1395                 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
 1396                     uiop->uio_td, &nfsva, &attrflag, NULL,
 1397                     called_from_strategy);
 1398         if (attrflag) {
 1399                 if (VTONFS(vp)->n_flag & ND_NFSV4)
 1400                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
 1401                             1);
 1402                 else
 1403                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 1404                             1);
 1405                 if (ret && !error)
 1406                         error = ret;
 1407         }
 1408         if (DOINGASYNC(vp))
 1409                 *iomode = NFSWRITE_FILESYNC;
 1410         if (error && NFS_ISV4(vp))
 1411                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1412         return (error);
 1413 }
 1414 
 1415 /*
 1416  * nfs mknod rpc
 1417  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1418  * mode set to specify the file type and the size field for rdev.
 1419  */
 1420 static int
 1421 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1422     struct vattr *vap)
 1423 {
 1424         struct nfsvattr nfsva, dnfsva;
 1425         struct vnode *newvp = NULL;
 1426         struct nfsnode *np = NULL, *dnp;
 1427         struct nfsfh *nfhp;
 1428         struct vattr vattr;
 1429         int error = 0, attrflag, dattrflag;
 1430         u_int32_t rdev;
 1431 
 1432         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1433                 rdev = vap->va_rdev;
 1434         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1435                 rdev = 0xffffffff;
 1436         else
 1437                 return (EOPNOTSUPP);
 1438         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1439                 return (error);
 1440         error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
 1441             rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 1442             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 1443         if (!error) {
 1444                 if (!nfhp)
 1445                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1446                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1447                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1448                             NULL);
 1449                 if (nfhp)
 1450                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1451                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1452         }
 1453         if (dattrflag)
 1454                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1455         if (!error) {
 1456                 newvp = NFSTOV(np);
 1457                 if (attrflag != 0) {
 1458                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1459                             0, 1);
 1460                         if (error != 0)
 1461                                 vput(newvp);
 1462                 }
 1463         }
 1464         if (!error) {
 1465                 *vpp = newvp;
 1466         } else if (NFS_ISV4(dvp)) {
 1467                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1468                     vap->va_gid);
 1469         }
 1470         dnp = VTONFS(dvp);
 1471         mtx_lock(&dnp->n_mtx);
 1472         dnp->n_flag |= NMODIFIED;
 1473         if (!dattrflag) {
 1474                 dnp->n_attrstamp = 0;
 1475                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1476         }
 1477         mtx_unlock(&dnp->n_mtx);
 1478         return (error);
 1479 }
 1480 
 1481 /*
 1482  * nfs mknod vop
 1483  * just call nfs_mknodrpc() to do the work.
 1484  */
 1485 /* ARGSUSED */
 1486 static int
 1487 nfs_mknod(struct vop_mknod_args *ap)
 1488 {
 1489         return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
 1490 }
 1491 
 1492 static struct mtx nfs_cverf_mtx;
 1493 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
 1494     MTX_DEF);
 1495 
 1496 static nfsquad_t
 1497 nfs_get_cverf(void)
 1498 {
 1499         static nfsquad_t cverf;
 1500         nfsquad_t ret;
 1501         static int cverf_initialized = 0;
 1502 
 1503         mtx_lock(&nfs_cverf_mtx);
 1504         if (cverf_initialized == 0) {
 1505                 cverf.lval[0] = arc4random();
 1506                 cverf.lval[1] = arc4random();
 1507                 cverf_initialized = 1;
 1508         } else
 1509                 cverf.qval++;
 1510         ret = cverf;
 1511         mtx_unlock(&nfs_cverf_mtx);
 1512 
 1513         return (ret);
 1514 }
 1515 
 1516 /*
 1517  * nfs file create call
 1518  */
 1519 static int
 1520 nfs_create(struct vop_create_args *ap)
 1521 {
 1522         struct vnode *dvp = ap->a_dvp;
 1523         struct vattr *vap = ap->a_vap;
 1524         struct componentname *cnp = ap->a_cnp;
 1525         struct nfsnode *np = NULL, *dnp;
 1526         struct vnode *newvp = NULL;
 1527         struct nfsmount *nmp;
 1528         struct nfsvattr dnfsva, nfsva;
 1529         struct nfsfh *nfhp;
 1530         nfsquad_t cverf;
 1531         int error = 0, attrflag, dattrflag, fmode = 0;
 1532         struct vattr vattr;
 1533 
 1534         /*
 1535          * Oops, not for me..
 1536          */
 1537         if (vap->va_type == VSOCK)
 1538                 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 1539 
 1540         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1541                 return (error);
 1542         if (vap->va_vaflags & VA_EXCLUSIVE)
 1543                 fmode |= O_EXCL;
 1544         dnp = VTONFS(dvp);
 1545         nmp = VFSTONFS(vnode_mount(dvp));
 1546 again:
 1547         /* For NFSv4, wait until any remove is done. */
 1548         mtx_lock(&dnp->n_mtx);
 1549         while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
 1550                 dnp->n_flag |= NREMOVEWANT;
 1551                 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
 1552         }
 1553         mtx_unlock(&dnp->n_mtx);
 1554 
 1555         cverf = nfs_get_cverf();
 1556         error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1557             vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
 1558             &nfhp, &attrflag, &dattrflag, NULL);
 1559         if (!error) {
 1560                 if (nfhp == NULL)
 1561                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1562                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1563                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1564                             NULL);
 1565                 if (nfhp != NULL)
 1566                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1567                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1568         }
 1569         if (dattrflag)
 1570                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1571         if (!error) {
 1572                 newvp = NFSTOV(np);
 1573                 if (attrflag == 0)
 1574                         error = nfsrpc_getattr(newvp, cnp->cn_cred,
 1575                             cnp->cn_thread, &nfsva, NULL);
 1576                 if (error == 0)
 1577                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1578                             0, 1);
 1579         }
 1580         if (error) {
 1581                 if (newvp != NULL) {
 1582                         vput(newvp);
 1583                         newvp = NULL;
 1584                 }
 1585                 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
 1586                     error == NFSERR_NOTSUPP) {
 1587                         fmode &= ~O_EXCL;
 1588                         goto again;
 1589                 }
 1590         } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
 1591                 if (nfscl_checksattr(vap, &nfsva)) {
 1592                         error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
 1593                             cnp->cn_thread, &nfsva, &attrflag, NULL);
 1594                         if (error && (vap->va_uid != (uid_t)VNOVAL ||
 1595                             vap->va_gid != (gid_t)VNOVAL)) {
 1596                                 /* try again without setting uid/gid */
 1597                                 vap->va_uid = (uid_t)VNOVAL;
 1598                                 vap->va_gid = (uid_t)VNOVAL;
 1599                                 error = nfsrpc_setattr(newvp, vap, NULL, 
 1600                                     cnp->cn_cred, cnp->cn_thread, &nfsva,
 1601                                     &attrflag, NULL);
 1602                         }
 1603                         if (attrflag)
 1604                                 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 1605                                     NULL, 0, 1);
 1606                         if (error != 0)
 1607                                 vput(newvp);
 1608                 }
 1609         }
 1610         if (!error) {
 1611                 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
 1612                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1613                             NULL);
 1614                 *ap->a_vpp = newvp;
 1615         } else if (NFS_ISV4(dvp)) {
 1616                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1617                     vap->va_gid);
 1618         }
 1619         mtx_lock(&dnp->n_mtx);
 1620         dnp->n_flag |= NMODIFIED;
 1621         if (!dattrflag) {
 1622                 dnp->n_attrstamp = 0;
 1623                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1624         }
 1625         mtx_unlock(&dnp->n_mtx);
 1626         return (error);
 1627 }
 1628 
 1629 /*
 1630  * nfs file remove call
 1631  * To try and make nfs semantics closer to ufs semantics, a file that has
 1632  * other processes using the vnode is renamed instead of removed and then
 1633  * removed later on the last close.
 1634  * - If v_usecount > 1
 1635  *        If a rename is not already in the works
 1636  *           call nfs_sillyrename() to set it up
 1637  *     else
 1638  *        do the remove rpc
 1639  */
 1640 static int
 1641 nfs_remove(struct vop_remove_args *ap)
 1642 {
 1643         struct vnode *vp = ap->a_vp;
 1644         struct vnode *dvp = ap->a_dvp;
 1645         struct componentname *cnp = ap->a_cnp;
 1646         struct nfsnode *np = VTONFS(vp);
 1647         int error = 0;
 1648         struct vattr vattr;
 1649 
 1650         KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
 1651         KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
 1652         if (vp->v_type == VDIR)
 1653                 error = EPERM;
 1654         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1655             VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
 1656             vattr.va_nlink > 1)) {
 1657                 /*
 1658                  * Purge the name cache so that the chance of a lookup for
 1659                  * the name succeeding while the remove is in progress is
 1660                  * minimized. Without node locking it can still happen, such
 1661                  * that an I/O op returns ESTALE, but since you get this if
 1662                  * another host removes the file..
 1663                  */
 1664                 cache_purge(vp);
 1665                 /*
 1666                  * throw away biocache buffers, mainly to avoid
 1667                  * unnecessary delayed writes later.
 1668                  */
 1669                 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1670                 if (error != EINTR && error != EIO)
 1671                         /* Do the rpc */
 1672                         error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
 1673                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1674                 /*
 1675                  * Kludge City: If the first reply to the remove rpc is lost..
 1676                  *   the reply to the retransmitted request will be ENOENT
 1677                  *   since the file was in fact removed
 1678                  *   Therefore, we cheat and return success.
 1679                  */
 1680                 if (error == ENOENT)
 1681                         error = 0;
 1682         } else if (!np->n_sillyrename)
 1683                 error = nfs_sillyrename(dvp, vp, cnp);
 1684         mtx_lock(&np->n_mtx);
 1685         np->n_attrstamp = 0;
 1686         mtx_unlock(&np->n_mtx);
 1687         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1688         return (error);
 1689 }
 1690 
 1691 /*
 1692  * nfs file remove rpc called from nfs_inactive
 1693  */
 1694 int
 1695 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
 1696 {
 1697         /*
 1698          * Make sure that the directory vnode is still valid.
 1699          * XXX we should lock sp->s_dvp here.
 1700          */
 1701         if (sp->s_dvp->v_type == VBAD)
 1702                 return (0);
 1703         return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
 1704             sp->s_cred, NULL));
 1705 }
 1706 
 1707 /*
 1708  * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
 1709  */
 1710 static int
 1711 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
 1712     int namelen, struct ucred *cred, struct thread *td)
 1713 {
 1714         struct nfsvattr dnfsva;
 1715         struct nfsnode *dnp = VTONFS(dvp);
 1716         int error = 0, dattrflag;
 1717 
 1718         mtx_lock(&dnp->n_mtx);
 1719         dnp->n_flag |= NREMOVEINPROG;
 1720         mtx_unlock(&dnp->n_mtx);
 1721         error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
 1722             &dattrflag, NULL);
 1723         mtx_lock(&dnp->n_mtx);
 1724         if ((dnp->n_flag & NREMOVEWANT)) {
 1725                 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
 1726                 mtx_unlock(&dnp->n_mtx);
 1727                 wakeup((caddr_t)dnp);
 1728         } else {
 1729                 dnp->n_flag &= ~NREMOVEINPROG;
 1730                 mtx_unlock(&dnp->n_mtx);
 1731         }
 1732         if (dattrflag)
 1733                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1734         mtx_lock(&dnp->n_mtx);
 1735         dnp->n_flag |= NMODIFIED;
 1736         if (!dattrflag) {
 1737                 dnp->n_attrstamp = 0;
 1738                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1739         }
 1740         mtx_unlock(&dnp->n_mtx);
 1741         if (error && NFS_ISV4(dvp))
 1742                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1743         return (error);
 1744 }
 1745 
 1746 /*
 1747  * nfs file rename call
 1748  */
 1749 static int
 1750 nfs_rename(struct vop_rename_args *ap)
 1751 {
 1752         struct vnode *fvp = ap->a_fvp;
 1753         struct vnode *tvp = ap->a_tvp;
 1754         struct vnode *fdvp = ap->a_fdvp;
 1755         struct vnode *tdvp = ap->a_tdvp;
 1756         struct componentname *tcnp = ap->a_tcnp;
 1757         struct componentname *fcnp = ap->a_fcnp;
 1758         struct nfsnode *fnp = VTONFS(ap->a_fvp);
 1759         struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
 1760         struct nfsv4node *newv4 = NULL;
 1761         int error;
 1762 
 1763         KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
 1764             (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
 1765         /* Check for cross-device rename */
 1766         if ((fvp->v_mount != tdvp->v_mount) ||
 1767             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1768                 error = EXDEV;
 1769                 goto out;
 1770         }
 1771 
 1772         if (fvp == tvp) {
 1773                 printf("nfs_rename: fvp == tvp (can't happen)\n");
 1774                 error = 0;
 1775                 goto out;
 1776         }
 1777         if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
 1778                 goto out;
 1779 
 1780         /*
 1781          * We have to flush B_DELWRI data prior to renaming
 1782          * the file.  If we don't, the delayed-write buffers
 1783          * can be flushed out later after the file has gone stale
 1784          * under NFSV3.  NFSV2 does not have this problem because
 1785          * ( as far as I can tell ) it flushes dirty buffers more
 1786          * often.
 1787          * 
 1788          * Skip the rename operation if the fsync fails, this can happen
 1789          * due to the server's volume being full, when we pushed out data
 1790          * that was written back to our cache earlier. Not checking for
 1791          * this condition can result in potential (silent) data loss.
 1792          */
 1793         error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1794         NFSVOPUNLOCK(fvp, 0);
 1795         if (!error && tvp)
 1796                 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1797         if (error)
 1798                 goto out;
 1799 
 1800         /*
 1801          * If the tvp exists and is in use, sillyrename it before doing the
 1802          * rename of the new file over it.
 1803          * XXX Can't sillyrename a directory.
 1804          */
 1805         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1806                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1807                 vput(tvp);
 1808                 tvp = NULL;
 1809         }
 1810 
 1811         error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1812             tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1813             tcnp->cn_thread);
 1814 
 1815         if (error == 0 && NFS_ISV4(tdvp)) {
 1816                 /*
 1817                  * For NFSv4, check to see if it is the same name and
 1818                  * replace the name, if it is different.
 1819                  */
 1820                 MALLOC(newv4, struct nfsv4node *,
 1821                     sizeof (struct nfsv4node) +
 1822                     tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
 1823                     M_NFSV4NODE, M_WAITOK);
 1824                 mtx_lock(&tdnp->n_mtx);
 1825                 mtx_lock(&fnp->n_mtx);
 1826                 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
 1827                     (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
 1828                       NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
 1829                       tcnp->cn_namelen) ||
 1830                       tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
 1831                       NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1832                         tdnp->n_fhp->nfh_len))) {
 1833 #ifdef notdef
 1834 { char nnn[100]; int nnnl;
 1835 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
 1836 bcopy(tcnp->cn_nameptr, nnn, nnnl);
 1837 nnn[nnnl] = '\0';
 1838 printf("ren replace=%s\n",nnn);
 1839 }
 1840 #endif
 1841                         FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
 1842                         fnp->n_v4 = newv4;
 1843                         newv4 = NULL;
 1844                         fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
 1845                         fnp->n_v4->n4_namelen = tcnp->cn_namelen;
 1846                         NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1847                             tdnp->n_fhp->nfh_len);
 1848                         NFSBCOPY(tcnp->cn_nameptr,
 1849                             NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
 1850                 }
 1851                 mtx_unlock(&tdnp->n_mtx);
 1852                 mtx_unlock(&fnp->n_mtx);
 1853                 if (newv4 != NULL)
 1854                         FREE((caddr_t)newv4, M_NFSV4NODE);
 1855         }
 1856 
 1857         if (fvp->v_type == VDIR) {
 1858                 if (tvp != NULL && tvp->v_type == VDIR)
 1859                         cache_purge(tdvp);
 1860                 cache_purge(fdvp);
 1861         }
 1862 
 1863 out:
 1864         if (tdvp == tvp)
 1865                 vrele(tdvp);
 1866         else
 1867                 vput(tdvp);
 1868         if (tvp)
 1869                 vput(tvp);
 1870         vrele(fdvp);
 1871         vrele(fvp);
 1872         /*
 1873          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1874          */
 1875         if (error == ENOENT)
 1876                 error = 0;
 1877         return (error);
 1878 }
 1879 
 1880 /*
 1881  * nfs file rename rpc called from nfs_remove() above
 1882  */
 1883 static int
 1884 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
 1885     struct sillyrename *sp)
 1886 {
 1887 
 1888         return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
 1889             sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
 1890             scnp->cn_thread));
 1891 }
 1892 
 1893 /*
 1894  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 1895  */
 1896 static int
 1897 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
 1898     int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
 1899     int tnamelen, struct ucred *cred, struct thread *td)
 1900 {
 1901         struct nfsvattr fnfsva, tnfsva;
 1902         struct nfsnode *fdnp = VTONFS(fdvp);
 1903         struct nfsnode *tdnp = VTONFS(tdvp);
 1904         int error = 0, fattrflag, tattrflag;
 1905 
 1906         error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
 1907             tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
 1908             &tattrflag, NULL, NULL);
 1909         mtx_lock(&fdnp->n_mtx);
 1910         fdnp->n_flag |= NMODIFIED;
 1911         if (fattrflag != 0) {
 1912                 mtx_unlock(&fdnp->n_mtx);
 1913                 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
 1914         } else {
 1915                 fdnp->n_attrstamp = 0;
 1916                 mtx_unlock(&fdnp->n_mtx);
 1917                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
 1918         }
 1919         mtx_lock(&tdnp->n_mtx);
 1920         tdnp->n_flag |= NMODIFIED;
 1921         if (tattrflag != 0) {
 1922                 mtx_unlock(&tdnp->n_mtx);
 1923                 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
 1924         } else {
 1925                 tdnp->n_attrstamp = 0;
 1926                 mtx_unlock(&tdnp->n_mtx);
 1927                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 1928         }
 1929         if (error && NFS_ISV4(fdvp))
 1930                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1931         return (error);
 1932 }
 1933 
 1934 /*
 1935  * nfs hard link create call
 1936  */
 1937 static int
 1938 nfs_link(struct vop_link_args *ap)
 1939 {
 1940         struct vnode *vp = ap->a_vp;
 1941         struct vnode *tdvp = ap->a_tdvp;
 1942         struct componentname *cnp = ap->a_cnp;
 1943         struct nfsnode *np, *tdnp;
 1944         struct nfsvattr nfsva, dnfsva;
 1945         int error = 0, attrflag, dattrflag;
 1946 
 1947         /*
 1948          * Push all writes to the server, so that the attribute cache
 1949          * doesn't get "out of sync" with the server.
 1950          * XXX There should be a better way!
 1951          */
 1952         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 1953 
 1954         error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
 1955             cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
 1956             &dattrflag, NULL);
 1957         tdnp = VTONFS(tdvp);
 1958         mtx_lock(&tdnp->n_mtx);
 1959         tdnp->n_flag |= NMODIFIED;
 1960         if (dattrflag != 0) {
 1961                 mtx_unlock(&tdnp->n_mtx);
 1962                 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
 1963         } else {
 1964                 tdnp->n_attrstamp = 0;
 1965                 mtx_unlock(&tdnp->n_mtx);
 1966                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 1967         }
 1968         if (attrflag)
 1969                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1970         else {
 1971                 np = VTONFS(vp);
 1972                 mtx_lock(&np->n_mtx);
 1973                 np->n_attrstamp = 0;
 1974                 mtx_unlock(&np->n_mtx);
 1975                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1976         }
 1977         /*
 1978          * If negative lookup caching is enabled, I might as well
 1979          * add an entry for this node. Not necessary for correctness,
 1980          * but if negative caching is enabled, then the system
 1981          * must care about lookup caching hit rate, so...
 1982          */
 1983         if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
 1984             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 1985                 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
 1986         }
 1987         if (error && NFS_ISV4(vp))
 1988                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 1989                     (gid_t)0);
 1990         return (error);
 1991 }
 1992 
 1993 /*
 1994  * nfs symbolic link create call
 1995  */
 1996 static int
 1997 nfs_symlink(struct vop_symlink_args *ap)
 1998 {
 1999         struct vnode *dvp = ap->a_dvp;
 2000         struct vattr *vap = ap->a_vap;
 2001         struct componentname *cnp = ap->a_cnp;
 2002         struct nfsvattr nfsva, dnfsva;
 2003         struct nfsfh *nfhp;
 2004         struct nfsnode *np = NULL, *dnp;
 2005         struct vnode *newvp = NULL;
 2006         int error = 0, attrflag, dattrflag, ret;
 2007 
 2008         vap->va_type = VLNK;
 2009         error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2010             ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 2011             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 2012         if (nfhp) {
 2013                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2014                     &np, NULL, LK_EXCLUSIVE);
 2015                 if (!ret)
 2016                         newvp = NFSTOV(np);
 2017                 else if (!error)
 2018                         error = ret;
 2019         }
 2020         if (newvp != NULL) {
 2021                 if (attrflag)
 2022                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2023                             0, 1);
 2024         } else if (!error) {
 2025                 /*
 2026                  * If we do not have an error and we could not extract the
 2027                  * newvp from the response due to the request being NFSv2, we
 2028                  * have to do a lookup in order to obtain a newvp to return.
 2029                  */
 2030                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2031                     cnp->cn_cred, cnp->cn_thread, &np);
 2032                 if (!error)
 2033                         newvp = NFSTOV(np);
 2034         }
 2035         if (error) {
 2036                 if (newvp)
 2037                         vput(newvp);
 2038                 if (NFS_ISV4(dvp))
 2039                         error = nfscl_maperr(cnp->cn_thread, error,
 2040                             vap->va_uid, vap->va_gid);
 2041         } else {
 2042                 *ap->a_vpp = newvp;
 2043         }
 2044 
 2045         dnp = VTONFS(dvp);
 2046         mtx_lock(&dnp->n_mtx);
 2047         dnp->n_flag |= NMODIFIED;
 2048         if (dattrflag != 0) {
 2049                 mtx_unlock(&dnp->n_mtx);
 2050                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2051         } else {
 2052                 dnp->n_attrstamp = 0;
 2053                 mtx_unlock(&dnp->n_mtx);
 2054                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2055         }
 2056         /*
 2057          * If negative lookup caching is enabled, I might as well
 2058          * add an entry for this node. Not necessary for correctness,
 2059          * but if negative caching is enabled, then the system
 2060          * must care about lookup caching hit rate, so...
 2061          */
 2062         if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2063             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 2064                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
 2065         }
 2066         return (error);
 2067 }
 2068 
 2069 /*
 2070  * nfs make dir call
 2071  */
 2072 static int
 2073 nfs_mkdir(struct vop_mkdir_args *ap)
 2074 {
 2075         struct vnode *dvp = ap->a_dvp;
 2076         struct vattr *vap = ap->a_vap;
 2077         struct componentname *cnp = ap->a_cnp;
 2078         struct nfsnode *np = NULL, *dnp;
 2079         struct vnode *newvp = NULL;
 2080         struct vattr vattr;
 2081         struct nfsfh *nfhp;
 2082         struct nfsvattr nfsva, dnfsva;
 2083         int error = 0, attrflag, dattrflag, ret;
 2084 
 2085         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
 2086                 return (error);
 2087         vap->va_type = VDIR;
 2088         error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2089             vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
 2090             &attrflag, &dattrflag, NULL);
 2091         dnp = VTONFS(dvp);
 2092         mtx_lock(&dnp->n_mtx);
 2093         dnp->n_flag |= NMODIFIED;
 2094         if (dattrflag != 0) {
 2095                 mtx_unlock(&dnp->n_mtx);
 2096                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2097         } else {
 2098                 dnp->n_attrstamp = 0;
 2099                 mtx_unlock(&dnp->n_mtx);
 2100                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2101         }
 2102         if (nfhp) {
 2103                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2104                     &np, NULL, LK_EXCLUSIVE);
 2105                 if (!ret) {
 2106                         newvp = NFSTOV(np);
 2107                         if (attrflag)
 2108                            (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 2109                                 NULL, 0, 1);
 2110                 } else if (!error)
 2111                         error = ret;
 2112         }
 2113         if (!error && newvp == NULL) {
 2114                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2115                     cnp->cn_cred, cnp->cn_thread, &np);
 2116                 if (!error) {
 2117                         newvp = NFSTOV(np);
 2118                         if (newvp->v_type != VDIR)
 2119                                 error = EEXIST;
 2120                 }
 2121         }
 2122         if (error) {
 2123                 if (newvp)
 2124                         vput(newvp);
 2125                 if (NFS_ISV4(dvp))
 2126                         error = nfscl_maperr(cnp->cn_thread, error,
 2127                             vap->va_uid, vap->va_gid);
 2128         } else {
 2129                 /*
 2130                  * If negative lookup caching is enabled, I might as well
 2131                  * add an entry for this node. Not necessary for correctness,
 2132                  * but if negative caching is enabled, then the system
 2133                  * must care about lookup caching hit rate, so...
 2134                  */
 2135                 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2136                     (cnp->cn_flags & MAKEENTRY) &&
 2137                     attrflag != 0 && dattrflag != 0)
 2138                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 2139                             &dnfsva.na_ctime);
 2140                 *ap->a_vpp = newvp;
 2141         }
 2142         return (error);
 2143 }
 2144 
 2145 /*
 2146  * nfs remove directory call
 2147  */
 2148 static int
 2149 nfs_rmdir(struct vop_rmdir_args *ap)
 2150 {
 2151         struct vnode *vp = ap->a_vp;
 2152         struct vnode *dvp = ap->a_dvp;
 2153         struct componentname *cnp = ap->a_cnp;
 2154         struct nfsnode *dnp;
 2155         struct nfsvattr dnfsva;
 2156         int error, dattrflag;
 2157 
 2158         if (dvp == vp)
 2159                 return (EINVAL);
 2160         error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2161             cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
 2162         dnp = VTONFS(dvp);
 2163         mtx_lock(&dnp->n_mtx);
 2164         dnp->n_flag |= NMODIFIED;
 2165         if (dattrflag != 0) {
 2166                 mtx_unlock(&dnp->n_mtx);
 2167                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2168         } else {
 2169                 dnp->n_attrstamp = 0;
 2170                 mtx_unlock(&dnp->n_mtx);
 2171                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2172         }
 2173 
 2174         cache_purge(dvp);
 2175         cache_purge(vp);
 2176         if (error && NFS_ISV4(dvp))
 2177                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2178                     (gid_t)0);
 2179         /*
 2180          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 2181          */
 2182         if (error == ENOENT)
 2183                 error = 0;
 2184         return (error);
 2185 }
 2186 
 2187 /*
 2188  * nfs readdir call
 2189  */
 2190 static int
 2191 nfs_readdir(struct vop_readdir_args *ap)
 2192 {
 2193         struct vnode *vp = ap->a_vp;
 2194         struct nfsnode *np = VTONFS(vp);
 2195         struct uio *uio = ap->a_uio;
 2196         ssize_t tresid, left;
 2197         int error = 0;
 2198         struct vattr vattr;
 2199         
 2200         if (ap->a_eofflag != NULL)
 2201                 *ap->a_eofflag = 0;
 2202         if (vp->v_type != VDIR) 
 2203                 return(EPERM);
 2204 
 2205         /*
 2206          * First, check for hit on the EOF offset cache
 2207          */
 2208         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 2209             (np->n_flag & NMODIFIED) == 0) {
 2210                 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
 2211                         mtx_lock(&np->n_mtx);
 2212                         if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
 2213                             !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 2214                                 mtx_unlock(&np->n_mtx);
 2215                                 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits);
 2216                                 if (ap->a_eofflag != NULL)
 2217                                         *ap->a_eofflag = 1;
 2218                                 return (0);
 2219                         } else
 2220                                 mtx_unlock(&np->n_mtx);
 2221                 }
 2222         }
 2223 
 2224         /*
 2225          * NFS always guarantees that directory entries don't straddle
 2226          * DIRBLKSIZ boundaries.  As such, we need to limit the size
 2227          * to an exact multiple of DIRBLKSIZ, to avoid copying a partial
 2228          * directory entry.
 2229          */
 2230         left = uio->uio_resid % DIRBLKSIZ;
 2231         if (left == uio->uio_resid)
 2232                 return (EINVAL);
 2233         uio->uio_resid -= left;
 2234 
 2235         /*
 2236          * Call ncl_bioread() to do the real work.
 2237          */
 2238         tresid = uio->uio_resid;
 2239         error = ncl_bioread(vp, uio, 0, ap->a_cred);
 2240 
 2241         if (!error && uio->uio_resid == tresid) {
 2242                 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses);
 2243                 if (ap->a_eofflag != NULL)
 2244                         *ap->a_eofflag = 1;
 2245         }
 2246         
 2247         /* Add the partial DIRBLKSIZ (left) back in. */
 2248         uio->uio_resid += left;
 2249         return (error);
 2250 }
 2251 
 2252 /*
 2253  * Readdir rpc call.
 2254  * Called from below the buffer cache by ncl_doio().
 2255  */
 2256 int
 2257 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2258     struct thread *td)
 2259 {
 2260         struct nfsvattr nfsva;
 2261         nfsuint64 *cookiep, cookie;
 2262         struct nfsnode *dnp = VTONFS(vp);
 2263         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2264         int error = 0, eof, attrflag;
 2265 
 2266         KASSERT(uiop->uio_iovcnt == 1 &&
 2267             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2268             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2269             ("nfs readdirrpc bad uio"));
 2270 
 2271         /*
 2272          * If there is no cookie, assume directory was stale.
 2273          */
 2274         ncl_dircookie_lock(dnp);
 2275         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2276         if (cookiep) {
 2277                 cookie = *cookiep;
 2278                 ncl_dircookie_unlock(dnp);
 2279         } else {
 2280                 ncl_dircookie_unlock(dnp);              
 2281                 return (NFSERR_BAD_COOKIE);
 2282         }
 2283 
 2284         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2285                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2286 
 2287         error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
 2288             &attrflag, &eof, NULL);
 2289         if (attrflag)
 2290                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2291 
 2292         if (!error) {
 2293                 /*
 2294                  * We are now either at the end of the directory or have filled
 2295                  * the block.
 2296                  */
 2297                 if (eof)
 2298                         dnp->n_direofoffset = uiop->uio_offset;
 2299                 else {
 2300                         if (uiop->uio_resid > 0)
 2301                                 printf("EEK! readdirrpc resid > 0\n");
 2302                         ncl_dircookie_lock(dnp);
 2303                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2304                         *cookiep = cookie;
 2305                         ncl_dircookie_unlock(dnp);
 2306                 }
 2307         } else if (NFS_ISV4(vp)) {
 2308                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2309         }
 2310         return (error);
 2311 }
 2312 
 2313 /*
 2314  * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
 2315  */
 2316 int
 2317 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2318     struct thread *td)
 2319 {
 2320         struct nfsvattr nfsva;
 2321         nfsuint64 *cookiep, cookie;
 2322         struct nfsnode *dnp = VTONFS(vp);
 2323         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2324         int error = 0, attrflag, eof;
 2325 
 2326         KASSERT(uiop->uio_iovcnt == 1 &&
 2327             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2328             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2329             ("nfs readdirplusrpc bad uio"));
 2330 
 2331         /*
 2332          * If there is no cookie, assume directory was stale.
 2333          */
 2334         ncl_dircookie_lock(dnp);
 2335         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2336         if (cookiep) {
 2337                 cookie = *cookiep;
 2338                 ncl_dircookie_unlock(dnp);
 2339         } else {
 2340                 ncl_dircookie_unlock(dnp);
 2341                 return (NFSERR_BAD_COOKIE);
 2342         }
 2343 
 2344         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2345                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2346         error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
 2347             &attrflag, &eof, NULL);
 2348         if (attrflag)
 2349                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2350 
 2351         if (!error) {
 2352                 /*
 2353                  * We are now either at end of the directory or have filled the
 2354                  * the block.
 2355                  */
 2356                 if (eof)
 2357                         dnp->n_direofoffset = uiop->uio_offset;
 2358                 else {
 2359                         if (uiop->uio_resid > 0)
 2360                                 printf("EEK! readdirplusrpc resid > 0\n");
 2361                         ncl_dircookie_lock(dnp);
 2362                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2363                         *cookiep = cookie;
 2364                         ncl_dircookie_unlock(dnp);
 2365                 }
 2366         } else if (NFS_ISV4(vp)) {
 2367                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2368         }
 2369         return (error);
 2370 }
 2371 
 2372 /*
 2373  * Silly rename. To make the NFS filesystem that is stateless look a little
 2374  * more like the "ufs" a remove of an active vnode is translated to a rename
 2375  * to a funny looking filename that is removed by nfs_inactive on the
 2376  * nfsnode. There is the potential for another process on a different client
 2377  * to create the same funny name between the nfs_lookitup() fails and the
 2378  * nfs_rename() completes, but...
 2379  */
 2380 static int
 2381 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2382 {
 2383         struct sillyrename *sp;
 2384         struct nfsnode *np;
 2385         int error;
 2386         short pid;
 2387         unsigned int lticks;
 2388 
 2389         cache_purge(dvp);
 2390         np = VTONFS(vp);
 2391         KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
 2392         MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
 2393             M_NEWNFSREQ, M_WAITOK);
 2394         sp->s_cred = crhold(cnp->cn_cred);
 2395         sp->s_dvp = dvp;
 2396         VREF(dvp);
 2397 
 2398         /* 
 2399          * Fudge together a funny name.
 2400          * Changing the format of the funny name to accommodate more 
 2401          * sillynames per directory.
 2402          * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 
 2403          * CPU ticks since boot.
 2404          */
 2405         pid = cnp->cn_thread->td_proc->p_pid;
 2406         lticks = (unsigned int)ticks;
 2407         for ( ; ; ) {
 2408                 sp->s_namlen = sprintf(sp->s_name, 
 2409                                        ".nfs.%08x.%04x4.4", lticks, 
 2410                                        pid);
 2411                 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2412                                  cnp->cn_thread, NULL))
 2413                         break;
 2414                 lticks++;
 2415         }
 2416         error = nfs_renameit(dvp, vp, cnp, sp);
 2417         if (error)
 2418                 goto bad;
 2419         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2420                 cnp->cn_thread, &np);
 2421         np->n_sillyrename = sp;
 2422         return (0);
 2423 bad:
 2424         vrele(sp->s_dvp);
 2425         crfree(sp->s_cred);
 2426         free((caddr_t)sp, M_NEWNFSREQ);
 2427         return (error);
 2428 }
 2429 
 2430 /*
 2431  * Look up a file name and optionally either update the file handle or
 2432  * allocate an nfsnode, depending on the value of npp.
 2433  * npp == NULL  --> just do the lookup
 2434  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2435  *                      handled too
 2436  * *npp != NULL --> update the file handle in the vnode
 2437  */
 2438 static int
 2439 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
 2440     struct thread *td, struct nfsnode **npp)
 2441 {
 2442         struct vnode *newvp = NULL, *vp;
 2443         struct nfsnode *np, *dnp = VTONFS(dvp);
 2444         struct nfsfh *nfhp, *onfhp;
 2445         struct nfsvattr nfsva, dnfsva;
 2446         struct componentname cn;
 2447         int error = 0, attrflag, dattrflag;
 2448         u_int hash;
 2449 
 2450         error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
 2451             &nfhp, &attrflag, &dattrflag, NULL);
 2452         if (dattrflag)
 2453                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2454         if (npp && !error) {
 2455                 if (*npp != NULL) {
 2456                     np = *npp;
 2457                     vp = NFSTOV(np);
 2458                     /*
 2459                      * For NFSv4, check to see if it is the same name and
 2460                      * replace the name, if it is different.
 2461                      */
 2462                     if (np->n_v4 != NULL && nfsva.na_type == VREG &&
 2463                         (np->n_v4->n4_namelen != len ||
 2464                          NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
 2465                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
 2466                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2467                          dnp->n_fhp->nfh_len))) {
 2468 #ifdef notdef
 2469 { char nnn[100]; int nnnl;
 2470 nnnl = (len < 100) ? len : 99;
 2471 bcopy(name, nnn, nnnl);
 2472 nnn[nnnl] = '\0';
 2473 printf("replace=%s\n",nnn);
 2474 }
 2475 #endif
 2476                             FREE((caddr_t)np->n_v4, M_NFSV4NODE);
 2477                             MALLOC(np->n_v4, struct nfsv4node *,
 2478                                 sizeof (struct nfsv4node) +
 2479                                 dnp->n_fhp->nfh_len + len - 1,
 2480                                 M_NFSV4NODE, M_WAITOK);
 2481                             np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
 2482                             np->n_v4->n4_namelen = len;
 2483                             NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2484                                 dnp->n_fhp->nfh_len);
 2485                             NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
 2486                     }
 2487                     hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
 2488                         FNV1_32_INIT);
 2489                     onfhp = np->n_fhp;
 2490                     /*
 2491                      * Rehash node for new file handle.
 2492                      */
 2493                     vfs_hash_rehash(vp, hash);
 2494                     np->n_fhp = nfhp;
 2495                     if (onfhp != NULL)
 2496                         FREE((caddr_t)onfhp, M_NFSFH);
 2497                     newvp = NFSTOV(np);
 2498                 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
 2499                     FREE((caddr_t)nfhp, M_NFSFH);
 2500                     VREF(dvp);
 2501                     newvp = dvp;
 2502                 } else {
 2503                     cn.cn_nameptr = name;
 2504                     cn.cn_namelen = len;
 2505                     error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
 2506                         &np, NULL, LK_EXCLUSIVE);
 2507                     if (error)
 2508                         return (error);
 2509                     newvp = NFSTOV(np);
 2510                 }
 2511                 if (!attrflag && *npp == NULL) {
 2512                         if (newvp == dvp)
 2513                                 vrele(newvp);
 2514                         else
 2515                                 vput(newvp);
 2516                         return (ENOENT);
 2517                 }
 2518                 if (attrflag)
 2519                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2520                             0, 1);
 2521         }
 2522         if (npp && *npp == NULL) {
 2523                 if (error) {
 2524                         if (newvp) {
 2525                                 if (newvp == dvp)
 2526                                         vrele(newvp);
 2527                                 else
 2528                                         vput(newvp);
 2529                         }
 2530                 } else
 2531                         *npp = np;
 2532         }
 2533         if (error && NFS_ISV4(dvp))
 2534                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2535         return (error);
 2536 }
 2537 
 2538 /*
 2539  * Nfs Version 3 and 4 commit rpc
 2540  */
 2541 int
 2542 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2543    struct thread *td)
 2544 {
 2545         struct nfsvattr nfsva;
 2546         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2547         struct nfsnode *np;
 2548         struct uio uio;
 2549         int error, attrflag;
 2550 
 2551         np = VTONFS(vp);
 2552         error = EIO;
 2553         attrflag = 0;
 2554         if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) {
 2555                 uio.uio_offset = offset;
 2556                 uio.uio_resid = cnt;
 2557                 error = nfscl_doiods(vp, &uio, NULL, NULL,
 2558                     NFSV4OPEN_ACCESSWRITE, 1, cred, td);
 2559                 if (error != 0) {
 2560                         mtx_lock(&np->n_mtx);
 2561                         np->n_flag &= ~NDSCOMMIT;
 2562                         mtx_unlock(&np->n_mtx);
 2563                 }
 2564         }
 2565         if (error != 0) {
 2566                 mtx_lock(&nmp->nm_mtx);
 2567                 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
 2568                         mtx_unlock(&nmp->nm_mtx);
 2569                         return (0);
 2570                 }
 2571                 mtx_unlock(&nmp->nm_mtx);
 2572                 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
 2573                     &attrflag, NULL);
 2574         }
 2575         if (attrflag != 0)
 2576                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
 2577                     0, 1);
 2578         if (error != 0 && NFS_ISV4(vp))
 2579                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2580         return (error);
 2581 }
 2582 
 2583 /*
 2584  * Strategy routine.
 2585  * For async requests when nfsiod(s) are running, queue the request by
 2586  * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
 2587  * request.
 2588  */
 2589 static int
 2590 nfs_strategy(struct vop_strategy_args *ap)
 2591 {
 2592         struct buf *bp;
 2593         struct vnode *vp;
 2594         struct ucred *cr;
 2595 
 2596         bp = ap->a_bp;
 2597         vp = ap->a_vp;
 2598         KASSERT(bp->b_vp == vp, ("missing b_getvp"));
 2599         KASSERT(!(bp->b_flags & B_DONE),
 2600             ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2601         BUF_ASSERT_HELD(bp);
 2602 
 2603         if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno)
 2604                 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize /
 2605                     DEV_BSIZE);
 2606         if (bp->b_iocmd == BIO_READ)
 2607                 cr = bp->b_rcred;
 2608         else
 2609                 cr = bp->b_wcred;
 2610 
 2611         /*
 2612          * If the op is asynchronous and an i/o daemon is waiting
 2613          * queue the request, wake it up and wait for completion
 2614          * otherwise just do it ourselves.
 2615          */
 2616         if ((bp->b_flags & B_ASYNC) == 0 ||
 2617             ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread))
 2618                 (void) ncl_doio(vp, bp, cr, curthread, 1);
 2619         return (0);
 2620 }
 2621 
 2622 /*
 2623  * fsync vnode op. Just call ncl_flush() with commit == 1.
 2624  */
 2625 /* ARGSUSED */
 2626 static int
 2627 nfs_fsync(struct vop_fsync_args *ap)
 2628 {
 2629 
 2630         if (ap->a_vp->v_type != VREG) {
 2631                 /*
 2632                  * For NFS, metadata is changed synchronously on the server,
 2633                  * so there is nothing to flush. Also, ncl_flush() clears
 2634                  * the NMODIFIED flag and that shouldn't be done here for
 2635                  * directories.
 2636                  */
 2637                 return (0);
 2638         }
 2639         return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0));
 2640 }
 2641 
 2642 /*
 2643  * Flush all the blocks associated with a vnode.
 2644  *      Walk through the buffer pool and push any dirty pages
 2645  *      associated with the vnode.
 2646  * If the called_from_renewthread argument is TRUE, it has been called
 2647  * from the NFSv4 renew thread and, as such, cannot block indefinitely
 2648  * waiting for a buffer write to complete.
 2649  */
 2650 int
 2651 ncl_flush(struct vnode *vp, int waitfor, struct thread *td,
 2652     int commit, int called_from_renewthread)
 2653 {
 2654         struct nfsnode *np = VTONFS(vp);
 2655         struct buf *bp;
 2656         int i;
 2657         struct buf *nbp;
 2658         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2659         int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2660         int passone = 1, trycnt = 0;
 2661         u_quad_t off, endoff, toff;
 2662         struct ucred* wcred = NULL;
 2663         struct buf **bvec = NULL;
 2664         struct bufobj *bo;
 2665 #ifndef NFS_COMMITBVECSIZ
 2666 #define NFS_COMMITBVECSIZ       20
 2667 #endif
 2668         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2669         int bvecsize = 0, bveccount;
 2670 
 2671         if (called_from_renewthread != 0)
 2672                 slptimeo = hz;
 2673         if (nmp->nm_flag & NFSMNT_INT)
 2674                 slpflag = PCATCH;
 2675         if (!commit)
 2676                 passone = 0;
 2677         bo = &vp->v_bufobj;
 2678         /*
 2679          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2680          * server, but has not been committed to stable storage on the server
 2681          * yet. On the first pass, the byte range is worked out and the commit
 2682          * rpc is done. On the second pass, ncl_writebp() is called to do the
 2683          * job.
 2684          */
 2685 again:
 2686         off = (u_quad_t)-1;
 2687         endoff = 0;
 2688         bvecpos = 0;
 2689         if (NFS_ISV34(vp) && commit) {
 2690                 if (bvec != NULL && bvec != bvec_on_stack)
 2691                         free(bvec, M_TEMP);
 2692                 /*
 2693                  * Count up how many buffers waiting for a commit.
 2694                  */
 2695                 bveccount = 0;
 2696                 BO_LOCK(bo);
 2697                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2698                         if (!BUF_ISLOCKED(bp) &&
 2699                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2700                                 == (B_DELWRI | B_NEEDCOMMIT))
 2701                                 bveccount++;
 2702                 }
 2703                 /*
 2704                  * Allocate space to remember the list of bufs to commit.  It is
 2705                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 2706                  * If we can't get memory (for whatever reason), we will end up
 2707                  * committing the buffers one-by-one in the loop below.
 2708                  */
 2709                 if (bveccount > NFS_COMMITBVECSIZ) {
 2710                         /*
 2711                          * Release the vnode interlock to avoid a lock
 2712                          * order reversal.
 2713                          */
 2714                         BO_UNLOCK(bo);
 2715                         bvec = (struct buf **)
 2716                                 malloc(bveccount * sizeof(struct buf *),
 2717                                        M_TEMP, M_NOWAIT);
 2718                         BO_LOCK(bo);
 2719                         if (bvec == NULL) {
 2720                                 bvec = bvec_on_stack;
 2721                                 bvecsize = NFS_COMMITBVECSIZ;
 2722                         } else
 2723                                 bvecsize = bveccount;
 2724                 } else {
 2725                         bvec = bvec_on_stack;
 2726                         bvecsize = NFS_COMMITBVECSIZ;
 2727                 }
 2728                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2729                         if (bvecpos >= bvecsize)
 2730                                 break;
 2731                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2732                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2733                                 continue;
 2734                         }
 2735                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2736                             (B_DELWRI | B_NEEDCOMMIT)) {
 2737                                 BUF_UNLOCK(bp);
 2738                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2739                                 continue;
 2740                         }
 2741                         BO_UNLOCK(bo);
 2742                         bremfree(bp);
 2743                         /*
 2744                          * Work out if all buffers are using the same cred
 2745                          * so we can deal with them all with one commit.
 2746                          *
 2747                          * NOTE: we are not clearing B_DONE here, so we have
 2748                          * to do it later on in this routine if we intend to
 2749                          * initiate I/O on the bp.
 2750                          *
 2751                          * Note: to avoid loopback deadlocks, we do not
 2752                          * assign b_runningbufspace.
 2753                          */
 2754                         if (wcred == NULL)
 2755                                 wcred = bp->b_wcred;
 2756                         else if (wcred != bp->b_wcred)
 2757                                 wcred = NOCRED;
 2758                         vfs_busy_pages(bp, 1);
 2759 
 2760                         BO_LOCK(bo);
 2761                         /*
 2762                          * bp is protected by being locked, but nbp is not
 2763                          * and vfs_busy_pages() may sleep.  We have to
 2764                          * recalculate nbp.
 2765                          */
 2766                         nbp = TAILQ_NEXT(bp, b_bobufs);
 2767 
 2768                         /*
 2769                          * A list of these buffers is kept so that the
 2770                          * second loop knows which buffers have actually
 2771                          * been committed. This is necessary, since there
 2772                          * may be a race between the commit rpc and new
 2773                          * uncommitted writes on the file.
 2774                          */
 2775                         bvec[bvecpos++] = bp;
 2776                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2777                                 bp->b_dirtyoff;
 2778                         if (toff < off)
 2779                                 off = toff;
 2780                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2781                         if (toff > endoff)
 2782                                 endoff = toff;
 2783                 }
 2784                 BO_UNLOCK(bo);
 2785         }
 2786         if (bvecpos > 0) {
 2787                 /*
 2788                  * Commit data on the server, as required.
 2789                  * If all bufs are using the same wcred, then use that with
 2790                  * one call for all of them, otherwise commit each one
 2791                  * separately.
 2792                  */
 2793                 if (wcred != NOCRED)
 2794                         retv = ncl_commit(vp, off, (int)(endoff - off),
 2795                                           wcred, td);
 2796                 else {
 2797                         retv = 0;
 2798                         for (i = 0; i < bvecpos; i++) {
 2799                                 off_t off, size;
 2800                                 bp = bvec[i];
 2801                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2802                                         bp->b_dirtyoff;
 2803                                 size = (u_quad_t)(bp->b_dirtyend
 2804                                                   - bp->b_dirtyoff);
 2805                                 retv = ncl_commit(vp, off, (int)size,
 2806                                                   bp->b_wcred, td);
 2807                                 if (retv) break;
 2808                         }
 2809                 }
 2810 
 2811                 if (retv == NFSERR_STALEWRITEVERF)
 2812                         ncl_clearcommit(vp->v_mount);
 2813 
 2814                 /*
 2815                  * Now, either mark the blocks I/O done or mark the
 2816                  * blocks dirty, depending on whether the commit
 2817                  * succeeded.
 2818                  */
 2819                 for (i = 0; i < bvecpos; i++) {
 2820                         bp = bvec[i];
 2821                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 2822                         if (retv) {
 2823                                 /*
 2824                                  * Error, leave B_DELWRI intact
 2825                                  */
 2826                                 vfs_unbusy_pages(bp);
 2827                                 brelse(bp);
 2828                         } else {
 2829                                 /*
 2830                                  * Success, remove B_DELWRI ( bundirty() ).
 2831                                  *
 2832                                  * b_dirtyoff/b_dirtyend seem to be NFS
 2833                                  * specific.  We should probably move that
 2834                                  * into bundirty(). XXX
 2835                                  */
 2836                                 bufobj_wref(bo);
 2837                                 bp->b_flags |= B_ASYNC;
 2838                                 bundirty(bp);
 2839                                 bp->b_flags &= ~B_DONE;
 2840                                 bp->b_ioflags &= ~BIO_ERROR;
 2841                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2842                                 bufdone(bp);
 2843                         }
 2844                 }
 2845         }
 2846 
 2847         /*
 2848          * Start/do any write(s) that are required.
 2849          */
 2850 loop:
 2851         BO_LOCK(bo);
 2852         TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2853                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2854                         if (waitfor != MNT_WAIT || passone)
 2855                                 continue;
 2856 
 2857                         error = BUF_TIMELOCK(bp,
 2858                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 2859                             BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
 2860                         if (error == 0) {
 2861                                 BUF_UNLOCK(bp);
 2862                                 goto loop;
 2863                         }
 2864                         if (error == ENOLCK) {
 2865                                 error = 0;
 2866                                 goto loop;
 2867                         }
 2868                         if (called_from_renewthread != 0) {
 2869                                 /*
 2870                                  * Return EIO so the flush will be retried
 2871                                  * later.
 2872                                  */
 2873                                 error = EIO;
 2874                                 goto done;
 2875                         }
 2876                         if (newnfs_sigintr(nmp, td)) {
 2877                                 error = EINTR;
 2878                                 goto done;
 2879                         }
 2880                         if (slpflag == PCATCH) {
 2881                                 slpflag = 0;
 2882                                 slptimeo = 2 * hz;
 2883                         }
 2884                         goto loop;
 2885                 }
 2886                 if ((bp->b_flags & B_DELWRI) == 0)
 2887                         panic("nfs_fsync: not dirty");
 2888                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 2889                         BUF_UNLOCK(bp);
 2890                         continue;
 2891                 }
 2892                 BO_UNLOCK(bo);
 2893                 bremfree(bp);
 2894                 if (passone || !commit)
 2895                     bp->b_flags |= B_ASYNC;
 2896                 else
 2897                     bp->b_flags |= B_ASYNC;
 2898                 bwrite(bp);
 2899                 if (newnfs_sigintr(nmp, td)) {
 2900                         error = EINTR;
 2901                         goto done;
 2902                 }
 2903                 goto loop;
 2904         }
 2905         if (passone) {
 2906                 passone = 0;
 2907                 BO_UNLOCK(bo);
 2908                 goto again;
 2909         }
 2910         if (waitfor == MNT_WAIT) {
 2911                 while (bo->bo_numoutput) {
 2912                         error = bufobj_wwait(bo, slpflag, slptimeo);
 2913                         if (error) {
 2914                             BO_UNLOCK(bo);
 2915                             if (called_from_renewthread != 0) {
 2916                                 /*
 2917                                  * Return EIO so that the flush will be
 2918                                  * retried later.
 2919                                  */
 2920                                 error = EIO;
 2921                                 goto done;
 2922                             }
 2923                             error = newnfs_sigintr(nmp, td);
 2924                             if (error)
 2925                                 goto done;
 2926                             if (slpflag == PCATCH) {
 2927                                 slpflag = 0;
 2928                                 slptimeo = 2 * hz;
 2929                             }
 2930                             BO_LOCK(bo);
 2931                         }
 2932                 }
 2933                 if (bo->bo_dirty.bv_cnt != 0 && commit) {
 2934                         BO_UNLOCK(bo);
 2935                         goto loop;
 2936                 }
 2937                 /*
 2938                  * Wait for all the async IO requests to drain
 2939                  */
 2940                 BO_UNLOCK(bo);
 2941                 mtx_lock(&np->n_mtx);
 2942                 while (np->n_directio_asyncwr > 0) {
 2943                         np->n_flag |= NFSYNCWAIT;
 2944                         error = newnfs_msleep(td, &np->n_directio_asyncwr,
 2945                             &np->n_mtx, slpflag | (PRIBIO + 1), 
 2946                             "nfsfsync", 0);
 2947                         if (error) {
 2948                                 if (newnfs_sigintr(nmp, td)) {
 2949                                         mtx_unlock(&np->n_mtx);
 2950                                         error = EINTR;  
 2951                                         goto done;
 2952                                 }
 2953                         }
 2954                 }
 2955                 mtx_unlock(&np->n_mtx);
 2956         } else
 2957                 BO_UNLOCK(bo);
 2958         if (NFSHASPNFS(nmp)) {
 2959                 nfscl_layoutcommit(vp, td);
 2960                 /*
 2961                  * Invalidate the attribute cache, since writes to a DS
 2962                  * won't update the size attribute.
 2963                  */
 2964                 mtx_lock(&np->n_mtx);
 2965                 np->n_attrstamp = 0;
 2966         } else
 2967                 mtx_lock(&np->n_mtx);
 2968         if (np->n_flag & NWRITEERR) {
 2969                 error = np->n_error;
 2970                 np->n_flag &= ~NWRITEERR;
 2971         }
 2972         if (commit && bo->bo_dirty.bv_cnt == 0 &&
 2973             bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
 2974                 np->n_flag &= ~NMODIFIED;
 2975         mtx_unlock(&np->n_mtx);
 2976 done:
 2977         if (bvec != NULL && bvec != bvec_on_stack)
 2978                 free(bvec, M_TEMP);
 2979         if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
 2980             (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
 2981             np->n_directio_asyncwr != 0)) {
 2982                 if (trycnt++ < 5) {
 2983                         /* try, try again... */
 2984                         passone = 1;
 2985                         wcred = NULL;
 2986                         bvec = NULL;
 2987                         bvecsize = 0;
 2988                         goto again;
 2989                 }
 2990                 vn_printf(vp, "ncl_flush failed");
 2991                 error = called_from_renewthread != 0 ? EIO : EBUSY;
 2992         }
 2993         return (error);
 2994 }
 2995 
 2996 /*
 2997  * NFS advisory byte-level locks.
 2998  */
 2999 static int
 3000 nfs_advlock(struct vop_advlock_args *ap)
 3001 {
 3002         struct vnode *vp = ap->a_vp;
 3003         struct ucred *cred;
 3004         struct nfsnode *np = VTONFS(ap->a_vp);
 3005         struct proc *p = (struct proc *)ap->a_id;
 3006         struct thread *td = curthread;  /* XXX */
 3007         struct vattr va;
 3008         int ret, error = EOPNOTSUPP;
 3009         u_quad_t size;
 3010         
 3011         ret = NFSVOPLOCK(vp, LK_SHARED);
 3012         if (ret != 0)
 3013                 return (EBADF);
 3014         if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
 3015                 if (vp->v_type != VREG) {
 3016                         NFSVOPUNLOCK(vp, 0);
 3017                         return (EINVAL);
 3018                 }
 3019                 if ((ap->a_flags & F_POSIX) != 0)
 3020                         cred = p->p_ucred;
 3021                 else
 3022                         cred = td->td_ucred;
 3023                 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
 3024                 if (vp->v_iflag & VI_DOOMED) {
 3025                         NFSVOPUNLOCK(vp, 0);
 3026                         return (EBADF);
 3027                 }
 3028 
 3029                 /*
 3030                  * If this is unlocking a write locked region, flush and
 3031                  * commit them before unlocking. This is required by
 3032                  * RFC3530 Sec. 9.3.2.
 3033                  */
 3034                 if (ap->a_op == F_UNLCK &&
 3035                     nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
 3036                     ap->a_flags))
 3037                         (void) ncl_flush(vp, MNT_WAIT, td, 1, 0);
 3038 
 3039                 /*
 3040                  * Loop around doing the lock op, while a blocking lock
 3041                  * must wait for the lock op to succeed.
 3042                  */
 3043                 do {
 3044                         ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
 3045                             ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
 3046                         if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3047                             ap->a_op == F_SETLK) {
 3048                                 NFSVOPUNLOCK(vp, 0);
 3049                                 error = nfs_catnap(PZERO | PCATCH, ret,
 3050                                     "ncladvl");
 3051                                 if (error)
 3052                                         return (EINTR);
 3053                                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 3054                                 if (vp->v_iflag & VI_DOOMED) {
 3055                                         NFSVOPUNLOCK(vp, 0);
 3056                                         return (EBADF);
 3057                                 }
 3058                         }
 3059                 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3060                      ap->a_op == F_SETLK);
 3061                 if (ret == NFSERR_DENIED) {
 3062                         NFSVOPUNLOCK(vp, 0);
 3063                         return (EAGAIN);
 3064                 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
 3065                         NFSVOPUNLOCK(vp, 0);
 3066                         return (ret);
 3067                 } else if (ret != 0) {
 3068                         NFSVOPUNLOCK(vp, 0);
 3069                         return (EACCES);
 3070                 }
 3071 
 3072                 /*
 3073                  * Now, if we just got a lock, invalidate data in the buffer
 3074                  * cache, as required, so that the coherency conforms with
 3075                  * RFC3530 Sec. 9.3.2.
 3076                  */
 3077                 if (ap->a_op == F_SETLK) {
 3078                         if ((np->n_flag & NMODIFIED) == 0) {
 3079                                 np->n_attrstamp = 0;
 3080                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3081                                 ret = VOP_GETATTR(vp, &va, cred);
 3082                         }
 3083                         if ((np->n_flag & NMODIFIED) || ret ||
 3084                             np->n_change != va.va_filerev) {
 3085                                 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
 3086                                 np->n_attrstamp = 0;
 3087                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3088                                 ret = VOP_GETATTR(vp, &va, cred);
 3089                                 if (!ret) {
 3090                                         np->n_mtime = va.va_mtime;
 3091                                         np->n_change = va.va_filerev;
 3092                                 }
 3093                         }
 3094                         /* Mark that a file lock has been acquired. */
 3095                         mtx_lock(&np->n_mtx);
 3096                         np->n_flag |= NHASBEENLOCKED;
 3097                         mtx_unlock(&np->n_mtx);
 3098                 }
 3099                 NFSVOPUNLOCK(vp, 0);
 3100                 return (0);
 3101         } else if (!NFS_ISV4(vp)) {
 3102                 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3103                         size = VTONFS(vp)->n_size;
 3104                         NFSVOPUNLOCK(vp, 0);
 3105                         error = lf_advlock(ap, &(vp->v_lockf), size);
 3106                 } else {
 3107                         if (nfs_advlock_p != NULL)
 3108                                 error = nfs_advlock_p(ap);
 3109                         else {
 3110                                 NFSVOPUNLOCK(vp, 0);
 3111                                 error = ENOLCK;
 3112                         }
 3113                 }
 3114                 if (error == 0 && ap->a_op == F_SETLK) {
 3115                         error = NFSVOPLOCK(vp, LK_SHARED);
 3116                         if (error == 0) {
 3117                                 /* Mark that a file lock has been acquired. */
 3118                                 mtx_lock(&np->n_mtx);
 3119                                 np->n_flag |= NHASBEENLOCKED;
 3120                                 mtx_unlock(&np->n_mtx);
 3121                                 NFSVOPUNLOCK(vp, 0);
 3122                         }
 3123                 }
 3124         } else
 3125                 NFSVOPUNLOCK(vp, 0);
 3126         return (error);
 3127 }
 3128 
 3129 /*
 3130  * NFS advisory byte-level locks.
 3131  */
 3132 static int
 3133 nfs_advlockasync(struct vop_advlockasync_args *ap)
 3134 {
 3135         struct vnode *vp = ap->a_vp;
 3136         u_quad_t size;
 3137         int error;
 3138         
 3139         if (NFS_ISV4(vp))
 3140                 return (EOPNOTSUPP);
 3141         error = NFSVOPLOCK(vp, LK_SHARED);
 3142         if (error)
 3143                 return (error);
 3144         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3145                 size = VTONFS(vp)->n_size;
 3146                 NFSVOPUNLOCK(vp, 0);
 3147                 error = lf_advlockasync(ap, &(vp->v_lockf), size);
 3148         } else {
 3149                 NFSVOPUNLOCK(vp, 0);
 3150                 error = EOPNOTSUPP;
 3151         }
 3152         return (error);
 3153 }
 3154 
 3155 /*
 3156  * Print out the contents of an nfsnode.
 3157  */
 3158 static int
 3159 nfs_print(struct vop_print_args *ap)
 3160 {
 3161         struct vnode *vp = ap->a_vp;
 3162         struct nfsnode *np = VTONFS(vp);
 3163 
 3164         printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid,
 3165             (uintmax_t)np->n_vattr.na_fsid);
 3166         if (vp->v_type == VFIFO)
 3167                 fifo_printinfo(vp);
 3168         printf("\n");
 3169         return (0);
 3170 }
 3171 
 3172 /*
 3173  * This is the "real" nfs::bwrite(struct buf*).
 3174  * We set B_CACHE if this is a VMIO buffer.
 3175  */
 3176 int
 3177 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
 3178 {
 3179         int oldflags, rtval;
 3180 
 3181         BUF_ASSERT_HELD(bp);
 3182 
 3183         if (bp->b_flags & B_INVAL) {
 3184                 brelse(bp);
 3185                 return (0);
 3186         }
 3187 
 3188         oldflags = bp->b_flags;
 3189         bp->b_flags |= B_CACHE;
 3190 
 3191         /*
 3192          * Undirty the bp.  We will redirty it later if the I/O fails.
 3193          */
 3194         bundirty(bp);
 3195         bp->b_flags &= ~B_DONE;
 3196         bp->b_ioflags &= ~BIO_ERROR;
 3197         bp->b_iocmd = BIO_WRITE;
 3198 
 3199         bufobj_wref(bp->b_bufobj);
 3200         curthread->td_ru.ru_oublock++;
 3201 
 3202         /*
 3203          * Note: to avoid loopback deadlocks, we do not
 3204          * assign b_runningbufspace.
 3205          */
 3206         vfs_busy_pages(bp, 1);
 3207 
 3208         BUF_KERNPROC(bp);
 3209         bp->b_iooffset = dbtob(bp->b_blkno);
 3210         bstrategy(bp);
 3211 
 3212         if ((oldflags & B_ASYNC) != 0)
 3213                 return (0);
 3214 
 3215         rtval = bufwait(bp);
 3216         if (oldflags & B_DELWRI)
 3217                 reassignbuf(bp);
 3218         brelse(bp);
 3219         return (rtval);
 3220 }
 3221 
 3222 /*
 3223  * nfs special file access vnode op.
 3224  * Essentially just get vattr and then imitate iaccess() since the device is
 3225  * local to the client.
 3226  */
 3227 static int
 3228 nfsspec_access(struct vop_access_args *ap)
 3229 {
 3230         struct vattr *vap;
 3231         struct ucred *cred = ap->a_cred;
 3232         struct vnode *vp = ap->a_vp;
 3233         accmode_t accmode = ap->a_accmode;
 3234         struct vattr vattr;
 3235         int error;
 3236 
 3237         /*
 3238          * Disallow write attempts on filesystems mounted read-only;
 3239          * unless the file is a socket, fifo, or a block or character
 3240          * device resident on the filesystem.
 3241          */
 3242         if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3243                 switch (vp->v_type) {
 3244                 case VREG:
 3245                 case VDIR:
 3246                 case VLNK:
 3247                         return (EROFS);
 3248                 default:
 3249                         break;
 3250                 }
 3251         }
 3252         vap = &vattr;
 3253         error = VOP_GETATTR(vp, vap, cred);
 3254         if (error)
 3255                 goto out;
 3256         error  = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
 3257             accmode, cred, NULL);
 3258 out:
 3259         return error;
 3260 }
 3261 
 3262 /*
 3263  * Read wrapper for fifos.
 3264  */
 3265 static int
 3266 nfsfifo_read(struct vop_read_args *ap)
 3267 {
 3268         struct nfsnode *np = VTONFS(ap->a_vp);
 3269         int error;
 3270 
 3271         /*
 3272          * Set access flag.
 3273          */
 3274         mtx_lock(&np->n_mtx);
 3275         np->n_flag |= NACC;
 3276         vfs_timestamp(&np->n_atim);
 3277         mtx_unlock(&np->n_mtx);
 3278         error = fifo_specops.vop_read(ap);
 3279         return error;   
 3280 }
 3281 
 3282 /*
 3283  * Write wrapper for fifos.
 3284  */
 3285 static int
 3286 nfsfifo_write(struct vop_write_args *ap)
 3287 {
 3288         struct nfsnode *np = VTONFS(ap->a_vp);
 3289 
 3290         /*
 3291          * Set update flag.
 3292          */
 3293         mtx_lock(&np->n_mtx);
 3294         np->n_flag |= NUPD;
 3295         vfs_timestamp(&np->n_mtim);
 3296         mtx_unlock(&np->n_mtx);
 3297         return(fifo_specops.vop_write(ap));
 3298 }
 3299 
 3300 /*
 3301  * Close wrapper for fifos.
 3302  *
 3303  * Update the times on the nfsnode then do fifo close.
 3304  */
 3305 static int
 3306 nfsfifo_close(struct vop_close_args *ap)
 3307 {
 3308         struct vnode *vp = ap->a_vp;
 3309         struct nfsnode *np = VTONFS(vp);
 3310         struct vattr vattr;
 3311         struct timespec ts;
 3312 
 3313         mtx_lock(&np->n_mtx);
 3314         if (np->n_flag & (NACC | NUPD)) {
 3315                 vfs_timestamp(&ts);
 3316                 if (np->n_flag & NACC)
 3317                         np->n_atim = ts;
 3318                 if (np->n_flag & NUPD)
 3319                         np->n_mtim = ts;
 3320                 np->n_flag |= NCHG;
 3321                 if (vrefcnt(vp) == 1 &&
 3322                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3323                         VATTR_NULL(&vattr);
 3324                         if (np->n_flag & NACC)
 3325                                 vattr.va_atime = np->n_atim;
 3326                         if (np->n_flag & NUPD)
 3327                                 vattr.va_mtime = np->n_mtim;
 3328                         mtx_unlock(&np->n_mtx);
 3329                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 3330                         goto out;
 3331                 }
 3332         }
 3333         mtx_unlock(&np->n_mtx);
 3334 out:
 3335         return (fifo_specops.vop_close(ap));
 3336 }
 3337 
 3338 /*
 3339  * Just call ncl_writebp() with the force argument set to 1.
 3340  *
 3341  * NOTE: B_DONE may or may not be set in a_bp on call.
 3342  */
 3343 static int
 3344 nfs_bwrite(struct buf *bp)
 3345 {
 3346 
 3347         return (ncl_writebp(bp, 1, curthread));
 3348 }
 3349 
 3350 struct buf_ops buf_ops_newnfs = {
 3351         .bop_name       =       "buf_ops_nfs",
 3352         .bop_write      =       nfs_bwrite,
 3353         .bop_strategy   =       bufstrategy,
 3354         .bop_sync       =       bufsync,
 3355         .bop_bdflush    =       bufbdflush,
 3356 };
 3357 
 3358 static int
 3359 nfs_getacl(struct vop_getacl_args *ap)
 3360 {
 3361         int error;
 3362 
 3363         if (ap->a_type != ACL_TYPE_NFS4)
 3364                 return (EOPNOTSUPP);
 3365         error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3366             NULL);
 3367         if (error > NFSERR_STALE) {
 3368                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3369                 error = EPERM;
 3370         }
 3371         return (error);
 3372 }
 3373 
 3374 static int
 3375 nfs_setacl(struct vop_setacl_args *ap)
 3376 {
 3377         int error;
 3378 
 3379         if (ap->a_type != ACL_TYPE_NFS4)
 3380                 return (EOPNOTSUPP);
 3381         error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3382             NULL);
 3383         if (error > NFSERR_STALE) {
 3384                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3385                 error = EPERM;
 3386         }
 3387         return (error);
 3388 }
 3389 
 3390 static int
 3391 nfs_set_text(struct vop_set_text_args *ap)
 3392 {
 3393         struct vnode *vp = ap->a_vp;
 3394         struct nfsnode *np;
 3395 
 3396         /*
 3397          * If the text file has been mmap'd, flush any dirty pages to the
 3398          * buffer cache and then...
 3399          * Make sure all writes are pushed to the NFS server.  If this is not
 3400          * done, the modify time of the file can change while the text
 3401          * file is being executed.  This will cause the process that is
 3402          * executing the text file to be terminated.
 3403          */
 3404         if (vp->v_object != NULL) {
 3405                 VM_OBJECT_WLOCK(vp->v_object);
 3406                 vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
 3407                 VM_OBJECT_WUNLOCK(vp->v_object);
 3408         }
 3409 
 3410         /* Now, flush the buffer cache. */
 3411         ncl_flush(vp, MNT_WAIT, curthread, 0, 0);
 3412 
 3413         /* And, finally, make sure that n_mtime is up to date. */
 3414         np = VTONFS(vp);
 3415         mtx_lock(&np->n_mtx);
 3416         np->n_mtime = np->n_vattr.na_mtime;
 3417         mtx_unlock(&np->n_mtx);
 3418 
 3419         vp->v_vflag |= VV_TEXT;
 3420         return (0);
 3421 }
 3422 
 3423 /*
 3424  * Return POSIX pathconf information applicable to nfs filesystems.
 3425  */
 3426 static int
 3427 nfs_pathconf(struct vop_pathconf_args *ap)
 3428 {
 3429         struct nfsv3_pathconf pc;
 3430         struct nfsvattr nfsva;
 3431         struct vnode *vp = ap->a_vp;
 3432         struct thread *td = curthread;
 3433         int attrflag, error;
 3434 
 3435         if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
 3436             ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
 3437             ap->a_name == _PC_NO_TRUNC)) ||
 3438             (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) {
 3439                 /*
 3440                  * Since only the above 4 a_names are returned by the NFSv3
 3441                  * Pathconf RPC, there is no point in doing it for others.
 3442                  * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
 3443                  * be used for _PC_NFS4_ACL as well.
 3444                  */
 3445                 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
 3446                     &attrflag, NULL);
 3447                 if (attrflag != 0)
 3448                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 3449                             1);
 3450                 if (error != 0)
 3451                         return (error);
 3452         } else {
 3453                 /*
 3454                  * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
 3455                  * just fake them.
 3456                  */
 3457                 pc.pc_linkmax = LINK_MAX;
 3458                 pc.pc_namemax = NFS_MAXNAMLEN;
 3459                 pc.pc_notrunc = 1;
 3460                 pc.pc_chownrestricted = 1;
 3461                 pc.pc_caseinsensitive = 0;
 3462                 pc.pc_casepreserving = 1;
 3463                 error = 0;
 3464         }
 3465         switch (ap->a_name) {
 3466         case _PC_LINK_MAX:
 3467                 *ap->a_retval = pc.pc_linkmax;
 3468                 break;
 3469         case _PC_NAME_MAX:
 3470                 *ap->a_retval = pc.pc_namemax;
 3471                 break;
 3472         case _PC_PIPE_BUF:
 3473                 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
 3474                         *ap->a_retval = PIPE_BUF;
 3475                 else
 3476                         error = EINVAL;
 3477                 break;
 3478         case _PC_CHOWN_RESTRICTED:
 3479                 *ap->a_retval = pc.pc_chownrestricted;
 3480                 break;
 3481         case _PC_NO_TRUNC:
 3482                 *ap->a_retval = pc.pc_notrunc;
 3483                 break;
 3484         case _PC_ACL_NFS4:
 3485                 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
 3486                     NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
 3487                         *ap->a_retval = 1;
 3488                 else
 3489                         *ap->a_retval = 0;
 3490                 break;
 3491         case _PC_ACL_PATH_MAX:
 3492                 if (NFS_ISV4(vp))
 3493                         *ap->a_retval = ACL_MAX_ENTRIES;
 3494                 else
 3495                         *ap->a_retval = 3;
 3496                 break;
 3497         case _PC_PRIO_IO:
 3498                 *ap->a_retval = 0;
 3499                 break;
 3500         case _PC_SYNC_IO:
 3501                 *ap->a_retval = 0;
 3502                 break;
 3503         case _PC_ALLOC_SIZE_MIN:
 3504                 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
 3505                 break;
 3506         case _PC_FILESIZEBITS:
 3507                 if (NFS_ISV34(vp))
 3508                         *ap->a_retval = 64;
 3509                 else
 3510                         *ap->a_retval = 32;
 3511                 break;
 3512         case _PC_REC_INCR_XFER_SIZE:
 3513                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3514                 break;
 3515         case _PC_REC_MAX_XFER_SIZE:
 3516                 *ap->a_retval = -1; /* means ``unlimited'' */
 3517                 break;
 3518         case _PC_REC_MIN_XFER_SIZE:
 3519                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 3520                 break;
 3521         case _PC_REC_XFER_ALIGN:
 3522                 *ap->a_retval = PAGE_SIZE;
 3523                 break;
 3524         case _PC_SYMLINK_MAX:
 3525                 *ap->a_retval = NFS_MAXPATHLEN;
 3526                 break;
 3527 
 3528         default:
 3529                 error = vop_stdpathconf(ap);
 3530                 break;
 3531         }
 3532         return (error);
 3533 }
 3534 

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