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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Rick Macklem at The University of Guelph.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from nfs_vnops.c        8.16 (Berkeley) 5/27/95
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 /*
   41  * vnode op calls for Sun NFS version 2, 3 and 4
   42  */
   43 
   44 #include "opt_inet.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/kernel.h>
   48 #include <sys/systm.h>
   49 #include <sys/resourcevar.h>
   50 #include <sys/proc.h>
   51 #include <sys/mount.h>
   52 #include <sys/bio.h>
   53 #include <sys/buf.h>
   54 #include <sys/extattr.h>
   55 #include <sys/filio.h>
   56 #include <sys/jail.h>
   57 #include <sys/malloc.h>
   58 #include <sys/mbuf.h>
   59 #include <sys/namei.h>
   60 #include <sys/socket.h>
   61 #include <sys/vnode.h>
   62 #include <sys/dirent.h>
   63 #include <sys/fcntl.h>
   64 #include <sys/lockf.h>
   65 #include <sys/stat.h>
   66 #include <sys/sysctl.h>
   67 #include <sys/signalvar.h>
   68 
   69 #include <vm/vm.h>
   70 #include <vm/vm_extern.h>
   71 #include <vm/vm_object.h>
   72 
   73 #include <fs/nfs/nfsport.h>
   74 #include <fs/nfsclient/nfsnode.h>
   75 #include <fs/nfsclient/nfsmount.h>
   76 #include <fs/nfsclient/nfs.h>
   77 #include <fs/nfsclient/nfs_kdtrace.h>
   78 
   79 #include <net/if.h>
   80 #include <netinet/in.h>
   81 #include <netinet/in_var.h>
   82 
   83 #include <nfs/nfs_lock.h>
   84 
   85 #ifdef KDTRACE_HOOKS
   86 #include <sys/dtrace_bsd.h>
   87 
   88 dtrace_nfsclient_accesscache_flush_probe_func_t
   89                 dtrace_nfscl_accesscache_flush_done_probe;
   90 uint32_t        nfscl_accesscache_flush_done_id;
   91 
   92 dtrace_nfsclient_accesscache_get_probe_func_t
   93                 dtrace_nfscl_accesscache_get_hit_probe,
   94                 dtrace_nfscl_accesscache_get_miss_probe;
   95 uint32_t        nfscl_accesscache_get_hit_id;
   96 uint32_t        nfscl_accesscache_get_miss_id;
   97 
   98 dtrace_nfsclient_accesscache_load_probe_func_t
   99                 dtrace_nfscl_accesscache_load_done_probe;
  100 uint32_t        nfscl_accesscache_load_done_id;
  101 #endif /* !KDTRACE_HOOKS */
  102 
  103 /* Defs */
  104 #define TRUE    1
  105 #define FALSE   0
  106 
  107 extern struct nfsstatsv1 nfsstatsv1;
  108 extern int nfsrv_useacl;
  109 extern int nfscl_debuglevel;
  110 MALLOC_DECLARE(M_NEWNFSREQ);
  111 
  112 static vop_read_t       nfsfifo_read;
  113 static vop_write_t      nfsfifo_write;
  114 static vop_close_t      nfsfifo_close;
  115 static int      nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
  116                     struct thread *);
  117 static vop_lookup_t     nfs_lookup;
  118 static vop_create_t     nfs_create;
  119 static vop_mknod_t      nfs_mknod;
  120 static vop_open_t       nfs_open;
  121 static vop_pathconf_t   nfs_pathconf;
  122 static vop_close_t      nfs_close;
  123 static vop_access_t     nfs_access;
  124 static vop_getattr_t    nfs_getattr;
  125 static vop_setattr_t    nfs_setattr;
  126 static vop_read_t       nfs_read;
  127 static vop_fsync_t      nfs_fsync;
  128 static vop_remove_t     nfs_remove;
  129 static vop_link_t       nfs_link;
  130 static vop_rename_t     nfs_rename;
  131 static vop_mkdir_t      nfs_mkdir;
  132 static vop_rmdir_t      nfs_rmdir;
  133 static vop_symlink_t    nfs_symlink;
  134 static vop_readdir_t    nfs_readdir;
  135 static vop_strategy_t   nfs_strategy;
  136 static  int     nfs_lookitup(struct vnode *, char *, int,
  137                     struct ucred *, struct thread *, struct nfsnode **);
  138 static  int     nfs_sillyrename(struct vnode *, struct vnode *,
  139                     struct componentname *);
  140 static vop_access_t     nfsspec_access;
  141 static vop_readlink_t   nfs_readlink;
  142 static vop_print_t      nfs_print;
  143 static vop_advlock_t    nfs_advlock;
  144 static vop_advlockasync_t nfs_advlockasync;
  145 static vop_getacl_t nfs_getacl;
  146 static vop_setacl_t nfs_setacl;
  147 static vop_advise_t nfs_advise;
  148 static vop_allocate_t nfs_allocate;
  149 static vop_copy_file_range_t nfs_copy_file_range;
  150 static vop_ioctl_t nfs_ioctl;
  151 static vop_getextattr_t nfs_getextattr;
  152 static vop_setextattr_t nfs_setextattr;
  153 static vop_listextattr_t nfs_listextattr;
  154 static vop_deleteextattr_t nfs_deleteextattr;
  155 static vop_lock1_t      nfs_lock;
  156 
  157 /*
  158  * Global vfs data structures for nfs
  159  */
  160 
  161 static struct vop_vector newnfs_vnodeops_nosig = {
  162         .vop_default =          &default_vnodeops,
  163         .vop_access =           nfs_access,
  164         .vop_advlock =          nfs_advlock,
  165         .vop_advlockasync =     nfs_advlockasync,
  166         .vop_close =            nfs_close,
  167         .vop_create =           nfs_create,
  168         .vop_fsync =            nfs_fsync,
  169         .vop_getattr =          nfs_getattr,
  170         .vop_getpages =         ncl_getpages,
  171         .vop_putpages =         ncl_putpages,
  172         .vop_inactive =         ncl_inactive,
  173         .vop_link =             nfs_link,
  174         .vop_lock1 =            nfs_lock,
  175         .vop_lookup =           nfs_lookup,
  176         .vop_mkdir =            nfs_mkdir,
  177         .vop_mknod =            nfs_mknod,
  178         .vop_open =             nfs_open,
  179         .vop_pathconf =         nfs_pathconf,
  180         .vop_print =            nfs_print,
  181         .vop_read =             nfs_read,
  182         .vop_readdir =          nfs_readdir,
  183         .vop_readlink =         nfs_readlink,
  184         .vop_reclaim =          ncl_reclaim,
  185         .vop_remove =           nfs_remove,
  186         .vop_rename =           nfs_rename,
  187         .vop_rmdir =            nfs_rmdir,
  188         .vop_setattr =          nfs_setattr,
  189         .vop_strategy =         nfs_strategy,
  190         .vop_symlink =          nfs_symlink,
  191         .vop_write =            ncl_write,
  192         .vop_getacl =           nfs_getacl,
  193         .vop_setacl =           nfs_setacl,
  194         .vop_advise =           nfs_advise,
  195         .vop_allocate =         nfs_allocate,
  196         .vop_copy_file_range =  nfs_copy_file_range,
  197         .vop_ioctl =            nfs_ioctl,
  198         .vop_getextattr =       nfs_getextattr,
  199         .vop_setextattr =       nfs_setextattr,
  200         .vop_listextattr =      nfs_listextattr,
  201         .vop_deleteextattr =    nfs_deleteextattr,
  202 };
  203 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig);
  204 
  205 static int
  206 nfs_vnodeops_bypass(struct vop_generic_args *a)
  207 {
  208 
  209         return (vop_sigdefer(&newnfs_vnodeops_nosig, a));
  210 }
  211 
  212 struct vop_vector newnfs_vnodeops = {
  213         .vop_default =          &default_vnodeops,
  214         .vop_bypass =           nfs_vnodeops_bypass,
  215 };
  216 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops);
  217 
  218 static struct vop_vector newnfs_fifoops_nosig = {
  219         .vop_default =          &fifo_specops,
  220         .vop_access =           nfsspec_access,
  221         .vop_close =            nfsfifo_close,
  222         .vop_fsync =            nfs_fsync,
  223         .vop_getattr =          nfs_getattr,
  224         .vop_inactive =         ncl_inactive,
  225         .vop_pathconf =         nfs_pathconf,
  226         .vop_print =            nfs_print,
  227         .vop_read =             nfsfifo_read,
  228         .vop_reclaim =          ncl_reclaim,
  229         .vop_setattr =          nfs_setattr,
  230         .vop_write =            nfsfifo_write,
  231 };
  232 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig);
  233 
  234 static int
  235 nfs_fifoops_bypass(struct vop_generic_args *a)
  236 {
  237 
  238         return (vop_sigdefer(&newnfs_fifoops_nosig, a));
  239 }
  240 
  241 struct vop_vector newnfs_fifoops = {
  242         .vop_default =          &default_vnodeops,
  243         .vop_bypass =           nfs_fifoops_bypass,
  244 };
  245 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops);
  246 
  247 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
  248     struct componentname *cnp, struct vattr *vap);
  249 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
  250     int namelen, struct ucred *cred, struct thread *td);
  251 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
  252     char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
  253     char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
  254 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
  255     struct componentname *scnp, struct sillyrename *sp);
  256 
  257 /*
  258  * Global variables
  259  */
  260 SYSCTL_DECL(_vfs_nfs);
  261 
  262 static int      nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
  263 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
  264            &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
  265 
  266 static int      nfs_prime_access_cache = 0;
  267 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
  268            &nfs_prime_access_cache, 0,
  269            "Prime NFS ACCESS cache when fetching attributes");
  270 
  271 static int      newnfs_commit_on_close = 0;
  272 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
  273     &newnfs_commit_on_close, 0, "write+commit on close, else only write");
  274 
  275 static int      nfs_clean_pages_on_close = 1;
  276 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
  277            &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
  278 
  279 int newnfs_directio_enable = 0;
  280 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
  281            &newnfs_directio_enable, 0, "Enable NFS directio");
  282 
  283 int nfs_keep_dirty_on_error;
  284 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
  285     &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
  286 
  287 /*
  288  * This sysctl allows other processes to mmap a file that has been opened
  289  * O_DIRECT by a process.  In general, having processes mmap the file while
  290  * Direct IO is in progress can lead to Data Inconsistencies.  But, we allow
  291  * this by default to prevent DoS attacks - to prevent a malicious user from
  292  * opening up files O_DIRECT preventing other users from mmap'ing these
  293  * files.  "Protected" environments where stricter consistency guarantees are
  294  * required can disable this knob.  The process that opened the file O_DIRECT
  295  * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
  296  * meaningful.
  297  */
  298 int newnfs_directio_allow_mmap = 1;
  299 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
  300            &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
  301 
  302 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY                \
  303                          | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
  304                          | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
  305 
  306 /*
  307  * SMP Locking Note :
  308  * The list of locks after the description of the lock is the ordering
  309  * of other locks acquired with the lock held.
  310  * np->n_mtx : Protects the fields in the nfsnode.
  311        VM Object Lock
  312        VI_MTX (acquired indirectly)
  313  * nmp->nm_mtx : Protects the fields in the nfsmount.
  314        rep->r_mtx
  315  * ncl_iod_mutex : Global lock, protects shared nfsiod state.
  316  * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
  317        nmp->nm_mtx
  318        rep->r_mtx
  319  * rep->r_mtx : Protects the fields in an nfsreq.
  320  */
  321 
  322 static int
  323 nfs_lock(struct vop_lock1_args *ap)
  324 {
  325         struct vnode *vp;
  326         struct nfsnode *np;
  327         u_quad_t nsize;
  328         int error, lktype;
  329         bool onfault;
  330 
  331         vp = ap->a_vp;
  332         lktype = ap->a_flags & LK_TYPE_MASK;
  333         error = VOP_LOCK1_APV(&default_vnodeops, ap);
  334         if (error != 0 || vp->v_op != &newnfs_vnodeops)
  335                 return (error);
  336         np = VTONFS(vp);
  337         if (np == NULL)
  338                 return (0);
  339         NFSLOCKNODE(np);
  340         if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED &&
  341             lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE &&
  342             lktype != LK_TRYUPGRADE)) {
  343                 NFSUNLOCKNODE(np);
  344                 return (0);
  345         }
  346         onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT &&
  347             (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE &&
  348             (lktype == LK_SHARED || lktype == LK_EXCLUSIVE);
  349         if (onfault && vp->v_vnlock->lk_recurse == 0) {
  350                 /*
  351                  * Force retry in vm_fault(), to make the lock request
  352                  * sleepable, which allows us to piggy-back the
  353                  * sleepable call to vnode_pager_setsize().
  354                  */
  355                 NFSUNLOCKNODE(np);
  356                 VOP_UNLOCK(vp);
  357                 return (EBUSY);
  358         }
  359         if ((ap->a_flags & LK_NOWAIT) != 0 ||
  360             (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) {
  361                 NFSUNLOCKNODE(np);
  362                 return (0);
  363         }
  364         if (lktype == LK_SHARED) {
  365                 NFSUNLOCKNODE(np);
  366                 VOP_UNLOCK(vp);
  367                 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
  368                 ap->a_flags |= LK_EXCLUSIVE;
  369                 error = VOP_LOCK1_APV(&default_vnodeops, ap);
  370                 if (error != 0 || vp->v_op != &newnfs_vnodeops)
  371                         return (error);
  372                 if (vp->v_data == NULL)
  373                         goto downgrade;
  374                 MPASS(vp->v_data == np);
  375                 NFSLOCKNODE(np);
  376                 if ((np->n_flag & NVNSETSZSKIP) == 0) {
  377                         NFSUNLOCKNODE(np);
  378                         goto downgrade;
  379                 }
  380         }
  381         np->n_flag &= ~NVNSETSZSKIP;
  382         nsize = np->n_size;
  383         NFSUNLOCKNODE(np);
  384         vnode_pager_setsize(vp, nsize);
  385 downgrade:
  386         if (lktype == LK_SHARED) {
  387                 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
  388                 ap->a_flags |= LK_DOWNGRADE;
  389                 (void)VOP_LOCK1_APV(&default_vnodeops, ap);
  390         }
  391         return (0);
  392 }
  393 
  394 static int
  395 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
  396     struct ucred *cred, u_int32_t *retmode)
  397 {
  398         int error = 0, attrflag, i, lrupos;
  399         u_int32_t rmode;
  400         struct nfsnode *np = VTONFS(vp);
  401         struct nfsvattr nfsva;
  402 
  403         error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
  404             &rmode, NULL);
  405         if (attrflag)
  406                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
  407         if (!error) {
  408                 lrupos = 0;
  409                 NFSLOCKNODE(np);
  410                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  411                         if (np->n_accesscache[i].uid == cred->cr_uid) {
  412                                 np->n_accesscache[i].mode = rmode;
  413                                 np->n_accesscache[i].stamp = time_second;
  414                                 break;
  415                         }
  416                         if (i > 0 && np->n_accesscache[i].stamp <
  417                             np->n_accesscache[lrupos].stamp)
  418                                 lrupos = i;
  419                 }
  420                 if (i == NFS_ACCESSCACHESIZE) {
  421                         np->n_accesscache[lrupos].uid = cred->cr_uid;
  422                         np->n_accesscache[lrupos].mode = rmode;
  423                         np->n_accesscache[lrupos].stamp = time_second;
  424                 }
  425                 NFSUNLOCKNODE(np);
  426                 if (retmode != NULL)
  427                         *retmode = rmode;
  428                 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
  429         } else if (NFS_ISV4(vp)) {
  430                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
  431         }
  432 #ifdef KDTRACE_HOOKS
  433         if (error != 0)
  434                 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
  435                     error);
  436 #endif
  437         return (error);
  438 }
  439 
  440 /*
  441  * nfs access vnode op.
  442  * For nfs version 2, just return ok. File accesses may fail later.
  443  * For nfs version 3, use the access rpc to check accessibility. If file modes
  444  * are changed on the server, accesses might still fail later.
  445  */
  446 static int
  447 nfs_access(struct vop_access_args *ap)
  448 {
  449         struct vnode *vp = ap->a_vp;
  450         int error = 0, i, gotahit;
  451         u_int32_t mode, wmode, rmode;
  452         int v34 = NFS_ISV34(vp);
  453         struct nfsnode *np = VTONFS(vp);
  454 
  455         /*
  456          * Disallow write attempts on filesystems mounted read-only;
  457          * unless the file is a socket, fifo, or a block or character
  458          * device resident on the filesystem.
  459          */
  460         if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
  461             VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
  462             VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
  463                 switch (vp->v_type) {
  464                 case VREG:
  465                 case VDIR:
  466                 case VLNK:
  467                         return (EROFS);
  468                 default:
  469                         break;
  470                 }
  471         }
  472         /*
  473          * For nfs v3 or v4, check to see if we have done this recently, and if
  474          * so return our cached result instead of making an ACCESS call.
  475          * If not, do an access rpc, otherwise you are stuck emulating
  476          * ufs_access() locally using the vattr. This may not be correct,
  477          * since the server may apply other access criteria such as
  478          * client uid-->server uid mapping that we do not know about.
  479          */
  480         if (v34) {
  481                 if (ap->a_accmode & VREAD)
  482                         mode = NFSACCESS_READ;
  483                 else
  484                         mode = 0;
  485                 if (vp->v_type != VDIR) {
  486                         if (ap->a_accmode & VWRITE)
  487                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  488                         if (ap->a_accmode & VAPPEND)
  489                                 mode |= NFSACCESS_EXTEND;
  490                         if (ap->a_accmode & VEXEC)
  491                                 mode |= NFSACCESS_EXECUTE;
  492                         if (ap->a_accmode & VDELETE)
  493                                 mode |= NFSACCESS_DELETE;
  494                 } else {
  495                         if (ap->a_accmode & VWRITE)
  496                                 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
  497                         if (ap->a_accmode & VAPPEND)
  498                                 mode |= NFSACCESS_EXTEND;
  499                         if (ap->a_accmode & VEXEC)
  500                                 mode |= NFSACCESS_LOOKUP;
  501                         if (ap->a_accmode & VDELETE)
  502                                 mode |= NFSACCESS_DELETE;
  503                         if (ap->a_accmode & VDELETE_CHILD)
  504                                 mode |= NFSACCESS_MODIFY;
  505                 }
  506                 /* XXX safety belt, only make blanket request if caching */
  507                 if (nfsaccess_cache_timeout > 0) {
  508                         wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
  509                                 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
  510                                 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
  511                 } else {
  512                         wmode = mode;
  513                 }
  514 
  515                 /*
  516                  * Does our cached result allow us to give a definite yes to
  517                  * this request?
  518                  */
  519                 gotahit = 0;
  520                 NFSLOCKNODE(np);
  521                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  522                         if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
  523                             if (time_second < (np->n_accesscache[i].stamp
  524                                 + nfsaccess_cache_timeout) &&
  525                                 (np->n_accesscache[i].mode & mode) == mode) {
  526                                 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits);
  527                                 gotahit = 1;
  528                             }
  529                             break;
  530                         }
  531                 }
  532                 NFSUNLOCKNODE(np);
  533 #ifdef KDTRACE_HOOKS
  534                 if (gotahit != 0)
  535                         KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
  536                             ap->a_cred->cr_uid, mode);
  537                 else
  538                         KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
  539                             ap->a_cred->cr_uid, mode);
  540 #endif
  541                 if (gotahit == 0) {
  542                         /*
  543                          * Either a no, or a don't know.  Go to the wire.
  544                          */
  545                         NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
  546                         error = nfs34_access_otw(vp, wmode, ap->a_td,
  547                             ap->a_cred, &rmode);
  548                         if (!error &&
  549                             (rmode & mode) != mode)
  550                                 error = EACCES;
  551                 }
  552                 return (error);
  553         } else {
  554                 if ((error = nfsspec_access(ap)) != 0) {
  555                         return (error);
  556                 }
  557                 /*
  558                  * Attempt to prevent a mapped root from accessing a file
  559                  * which it shouldn't.  We try to read a byte from the file
  560                  * if the user is root and the file is not zero length.
  561                  * After calling nfsspec_access, we should have the correct
  562                  * file size cached.
  563                  */
  564                 NFSLOCKNODE(np);
  565                 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
  566                     && VTONFS(vp)->n_size > 0) {
  567                         struct iovec aiov;
  568                         struct uio auio;
  569                         char buf[1];
  570 
  571                         NFSUNLOCKNODE(np);
  572                         aiov.iov_base = buf;
  573                         aiov.iov_len = 1;
  574                         auio.uio_iov = &aiov;
  575                         auio.uio_iovcnt = 1;
  576                         auio.uio_offset = 0;
  577                         auio.uio_resid = 1;
  578                         auio.uio_segflg = UIO_SYSSPACE;
  579                         auio.uio_rw = UIO_READ;
  580                         auio.uio_td = ap->a_td;
  581 
  582                         if (vp->v_type == VREG)
  583                                 error = ncl_readrpc(vp, &auio, ap->a_cred);
  584                         else if (vp->v_type == VDIR) {
  585                                 char* bp;
  586                                 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
  587                                 aiov.iov_base = bp;
  588                                 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
  589                                 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
  590                                     ap->a_td);
  591                                 free(bp, M_TEMP);
  592                         } else if (vp->v_type == VLNK)
  593                                 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
  594                         else
  595                                 error = EACCES;
  596                 } else
  597                         NFSUNLOCKNODE(np);
  598                 return (error);
  599         }
  600 }
  601 
  602 /*
  603  * nfs open vnode op
  604  * Check to see if the type is ok
  605  * and that deletion is not in progress.
  606  * For paged in text files, you will need to flush the page cache
  607  * if consistency is lost.
  608  */
  609 /* ARGSUSED */
  610 static int
  611 nfs_open(struct vop_open_args *ap)
  612 {
  613         struct vnode *vp = ap->a_vp;
  614         struct nfsnode *np = VTONFS(vp);
  615         struct vattr vattr;
  616         int error;
  617         int fmode = ap->a_mode;
  618         struct ucred *cred;
  619         vm_object_t obj;
  620 
  621         if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
  622                 return (EOPNOTSUPP);
  623 
  624         /*
  625          * For NFSv4, we need to do the Open Op before cache validation,
  626          * so that we conform to RFC3530 Sec. 9.3.1.
  627          */
  628         if (NFS_ISV4(vp)) {
  629                 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
  630                 if (error) {
  631                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  632                             (gid_t)0);
  633                         return (error);
  634                 }
  635         }
  636 
  637         /*
  638          * Now, if this Open will be doing reading, re-validate/flush the
  639          * cache, so that Close/Open coherency is maintained.
  640          */
  641         NFSLOCKNODE(np);
  642         if (np->n_flag & NMODIFIED) {
  643                 NFSUNLOCKNODE(np);
  644                 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  645                 if (error == EINTR || error == EIO) {
  646                         if (NFS_ISV4(vp))
  647                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  648                         return (error);
  649                 }
  650                 NFSLOCKNODE(np);
  651                 np->n_attrstamp = 0;
  652                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  653                 if (vp->v_type == VDIR)
  654                         np->n_direofoffset = 0;
  655                 NFSUNLOCKNODE(np);
  656                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  657                 if (error) {
  658                         if (NFS_ISV4(vp))
  659                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  660                         return (error);
  661                 }
  662                 NFSLOCKNODE(np);
  663                 np->n_mtime = vattr.va_mtime;
  664                 if (NFS_ISV4(vp))
  665                         np->n_change = vattr.va_filerev;
  666         } else {
  667                 NFSUNLOCKNODE(np);
  668                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  669                 if (error) {
  670                         if (NFS_ISV4(vp))
  671                                 (void) nfsrpc_close(vp, 0, ap->a_td);
  672                         return (error);
  673                 }
  674                 NFSLOCKNODE(np);
  675                 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
  676                     NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
  677                         if (vp->v_type == VDIR)
  678                                 np->n_direofoffset = 0;
  679                         NFSUNLOCKNODE(np);
  680                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  681                         if (error == EINTR || error == EIO) {
  682                                 if (NFS_ISV4(vp))
  683                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  684                                 return (error);
  685                         }
  686                         NFSLOCKNODE(np);
  687                         np->n_mtime = vattr.va_mtime;
  688                         if (NFS_ISV4(vp))
  689                                 np->n_change = vattr.va_filerev;
  690                 }
  691         }
  692 
  693         /*
  694          * If the object has >= 1 O_DIRECT active opens, we disable caching.
  695          */
  696         if (newnfs_directio_enable && (fmode & O_DIRECT) &&
  697             (vp->v_type == VREG)) {
  698                 if (np->n_directio_opens == 0) {
  699                         NFSUNLOCKNODE(np);
  700                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  701                         if (error) {
  702                                 if (NFS_ISV4(vp))
  703                                         (void) nfsrpc_close(vp, 0, ap->a_td);
  704                                 return (error);
  705                         }
  706                         NFSLOCKNODE(np);
  707                         np->n_flag |= NNONCACHE;
  708                 }
  709                 np->n_directio_opens++;
  710         }
  711 
  712         /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */
  713         if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0)
  714                 np->n_flag |= NWRITEOPENED;
  715 
  716         /*
  717          * If this is an open for writing, capture a reference to the
  718          * credentials, so they can be used by ncl_putpages(). Using
  719          * these write credentials is preferable to the credentials of
  720          * whatever thread happens to be doing the VOP_PUTPAGES() since
  721          * the write RPCs are less likely to fail with EACCES.
  722          */
  723         if ((fmode & FWRITE) != 0) {
  724                 cred = np->n_writecred;
  725                 np->n_writecred = crhold(ap->a_cred);
  726         } else
  727                 cred = NULL;
  728         NFSUNLOCKNODE(np);
  729 
  730         if (cred != NULL)
  731                 crfree(cred);
  732         vnode_create_vobject(vp, vattr.va_size, ap->a_td);
  733 
  734         /*
  735          * If the text file has been mmap'd, flush any dirty pages to the
  736          * buffer cache and then...
  737          * Make sure all writes are pushed to the NFS server.  If this is not
  738          * done, the modify time of the file can change while the text
  739          * file is being executed.  This will cause the process that is
  740          * executing the text file to be terminated.
  741          */
  742         if (vp->v_writecount <= -1) {
  743                 if ((obj = vp->v_object) != NULL &&
  744                     vm_object_mightbedirty(obj)) {
  745                         VM_OBJECT_WLOCK(obj);
  746                         vm_object_page_clean(obj, 0, 0, OBJPC_SYNC);
  747                         VM_OBJECT_WUNLOCK(obj);
  748                 }
  749 
  750                 /* Now, flush the buffer cache. */
  751                 ncl_flush(vp, MNT_WAIT, curthread, 0, 0);
  752 
  753                 /* And, finally, make sure that n_mtime is up to date. */
  754                 np = VTONFS(vp);
  755                 NFSLOCKNODE(np);
  756                 np->n_mtime = np->n_vattr.na_mtime;
  757                 NFSUNLOCKNODE(np);
  758         }
  759         return (0);
  760 }
  761 
  762 /*
  763  * nfs close vnode op
  764  * What an NFS client should do upon close after writing is a debatable issue.
  765  * Most NFS clients push delayed writes to the server upon close, basically for
  766  * two reasons:
  767  * 1 - So that any write errors may be reported back to the client process
  768  *     doing the close system call. By far the two most likely errors are
  769  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
  770  * 2 - To put a worst case upper bound on cache inconsistency between
  771  *     multiple clients for the file.
  772  * There is also a consistency problem for Version 2 of the protocol w.r.t.
  773  * not being able to tell if other clients are writing a file concurrently,
  774  * since there is no way of knowing if the changed modify time in the reply
  775  * is only due to the write for this client.
  776  * (NFS Version 3 provides weak cache consistency data in the reply that
  777  *  should be sufficient to detect and handle this case.)
  778  *
  779  * The current code does the following:
  780  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
  781  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
  782  *                     or commit them (this satisfies 1 and 2 except for the
  783  *                     case where the server crashes after this close but
  784  *                     before the commit RPC, which is felt to be "good
  785  *                     enough". Changing the last argument to ncl_flush() to
  786  *                     a 1 would force a commit operation, if it is felt a
  787  *                     commit is necessary now.
  788  * for NFS Version 4 - flush the dirty buffers and commit them, if
  789  *                     nfscl_mustflush() says this is necessary.
  790  *                     It is necessary if there is no write delegation held,
  791  *                     in order to satisfy open/close coherency.
  792  *                     If the file isn't cached on local stable storage,
  793  *                     it may be necessary in order to detect "out of space"
  794  *                     errors from the server, if the write delegation
  795  *                     issued by the server doesn't allow the file to grow.
  796  */
  797 /* ARGSUSED */
  798 static int
  799 nfs_close(struct vop_close_args *ap)
  800 {
  801         struct vnode *vp = ap->a_vp;
  802         struct nfsnode *np = VTONFS(vp);
  803         struct nfsvattr nfsva;
  804         struct ucred *cred;
  805         int error = 0, ret, localcred = 0;
  806         int fmode = ap->a_fflag;
  807 
  808         if (NFSCL_FORCEDISM(vp->v_mount))
  809                 return (0);
  810         /*
  811          * During shutdown, a_cred isn't valid, so just use root.
  812          */
  813         if (ap->a_cred == NOCRED) {
  814                 cred = newnfs_getcred();
  815                 localcred = 1;
  816         } else {
  817                 cred = ap->a_cred;
  818         }
  819         if (vp->v_type == VREG) {
  820             /*
  821              * Examine and clean dirty pages, regardless of NMODIFIED.
  822              * This closes a major hole in close-to-open consistency.
  823              * We want to push out all dirty pages (and buffers) on
  824              * close, regardless of whether they were dirtied by
  825              * mmap'ed writes or via write().
  826              */
  827             if (nfs_clean_pages_on_close && vp->v_object) {
  828                 VM_OBJECT_WLOCK(vp->v_object);
  829                 vm_object_page_clean(vp->v_object, 0, 0, 0);
  830                 VM_OBJECT_WUNLOCK(vp->v_object);
  831             }
  832             NFSLOCKNODE(np);
  833             if (np->n_flag & NMODIFIED) {
  834                 NFSUNLOCKNODE(np);
  835                 if (NFS_ISV3(vp)) {
  836                     /*
  837                      * Under NFSv3 we have dirty buffers to dispose of.  We
  838                      * must flush them to the NFS server.  We have the option
  839                      * of waiting all the way through the commit rpc or just
  840                      * waiting for the initial write.  The default is to only
  841                      * wait through the initial write so the data is in the
  842                      * server's cache, which is roughly similar to the state
  843                      * a standard disk subsystem leaves the file in on close().
  844                      *
  845                      * We cannot clear the NMODIFIED bit in np->n_flag due to
  846                      * potential races with other processes, and certainly
  847                      * cannot clear it if we don't commit.
  848                      * These races occur when there is no longer the old
  849                      * traditional vnode locking implemented for Vnode Ops.
  850                      */
  851                     int cm = newnfs_commit_on_close ? 1 : 0;
  852                     error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0);
  853                     /* np->n_flag &= ~NMODIFIED; */
  854                 } else if (NFS_ISV4(vp)) { 
  855                         if (nfscl_mustflush(vp) != 0) {
  856                                 int cm = newnfs_commit_on_close ? 1 : 0;
  857                                 error = ncl_flush(vp, MNT_WAIT, ap->a_td,
  858                                     cm, 0);
  859                                 /*
  860                                  * as above w.r.t races when clearing
  861                                  * NMODIFIED.
  862                                  * np->n_flag &= ~NMODIFIED;
  863                                  */
  864                         }
  865                 } else {
  866                         error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  867                 }
  868                 NFSLOCKNODE(np);
  869             }
  870             /* 
  871              * Invalidate the attribute cache in all cases.
  872              * An open is going to fetch fresh attrs any way, other procs
  873              * on this node that have file open will be forced to do an 
  874              * otw attr fetch, but this is safe.
  875              * --> A user found that their RPC count dropped by 20% when
  876              *     this was commented out and I can't see any requirement
  877              *     for it, so I've disabled it when negative lookups are
  878              *     enabled. (What does this have to do with negative lookup
  879              *     caching? Well nothing, except it was reported by the
  880              *     same user that needed negative lookup caching and I wanted
  881              *     there to be a way to disable it to see if it
  882              *     is the cause of some caching/coherency issue that might
  883              *     crop up.)
  884              */
  885             if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) {
  886                     np->n_attrstamp = 0;
  887                     KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  888             }
  889             if (np->n_flag & NWRITEERR) {
  890                 np->n_flag &= ~NWRITEERR;
  891                 error = np->n_error;
  892             }
  893             NFSUNLOCKNODE(np);
  894         }
  895 
  896         if (NFS_ISV4(vp)) {
  897                 /*
  898                  * Get attributes so "change" is up to date.
  899                  */
  900                 if (error == 0 && nfscl_mustflush(vp) != 0 &&
  901                     vp->v_type == VREG &&
  902                     (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) {
  903                         ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
  904                             NULL);
  905                         if (!ret) {
  906                                 np->n_change = nfsva.na_filerev;
  907                                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
  908                                     NULL, 0, 0);
  909                         }
  910                 }
  911 
  912                 /*
  913                  * and do the close.
  914                  */
  915                 ret = nfsrpc_close(vp, 0, ap->a_td);
  916                 if (!error && ret)
  917                         error = ret;
  918                 if (error)
  919                         error = nfscl_maperr(ap->a_td, error, (uid_t)0,
  920                             (gid_t)0);
  921         }
  922         if (newnfs_directio_enable)
  923                 KASSERT((np->n_directio_asyncwr == 0),
  924                         ("nfs_close: dirty unflushed (%d) directio buffers\n",
  925                          np->n_directio_asyncwr));
  926         if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  927                 NFSLOCKNODE(np);
  928                 KASSERT((np->n_directio_opens > 0), 
  929                         ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
  930                 np->n_directio_opens--;
  931                 if (np->n_directio_opens == 0)
  932                         np->n_flag &= ~NNONCACHE;
  933                 NFSUNLOCKNODE(np);
  934         }
  935         if (localcred)
  936                 NFSFREECRED(cred);
  937         return (error);
  938 }
  939 
  940 /*
  941  * nfs getattr call from vfs.
  942  */
  943 static int
  944 nfs_getattr(struct vop_getattr_args *ap)
  945 {
  946         struct vnode *vp = ap->a_vp;
  947         struct thread *td = curthread;  /* XXX */
  948         struct nfsnode *np = VTONFS(vp);
  949         int error = 0;
  950         struct nfsvattr nfsva;
  951         struct vattr *vap = ap->a_vap;
  952         struct vattr vattr;
  953 
  954         /*
  955          * Update local times for special files.
  956          */
  957         NFSLOCKNODE(np);
  958         if (np->n_flag & (NACC | NUPD))
  959                 np->n_flag |= NCHG;
  960         NFSUNLOCKNODE(np);
  961         /*
  962          * First look in the cache.
  963          */
  964         if (ncl_getattrcache(vp, &vattr) == 0) {
  965                 vap->va_type = vattr.va_type;
  966                 vap->va_mode = vattr.va_mode;
  967                 vap->va_nlink = vattr.va_nlink;
  968                 vap->va_uid = vattr.va_uid;
  969                 vap->va_gid = vattr.va_gid;
  970                 vap->va_fsid = vattr.va_fsid;
  971                 vap->va_fileid = vattr.va_fileid;
  972                 vap->va_size = vattr.va_size;
  973                 vap->va_blocksize = vattr.va_blocksize;
  974                 vap->va_atime = vattr.va_atime;
  975                 vap->va_mtime = vattr.va_mtime;
  976                 vap->va_ctime = vattr.va_ctime;
  977                 vap->va_gen = vattr.va_gen;
  978                 vap->va_flags = vattr.va_flags;
  979                 vap->va_rdev = vattr.va_rdev;
  980                 vap->va_bytes = vattr.va_bytes;
  981                 vap->va_filerev = vattr.va_filerev;
  982                 /*
  983                  * Get the local modify time for the case of a write
  984                  * delegation.
  985                  */
  986                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
  987                 return (0);
  988         }
  989 
  990         if (NFS_ISV34(vp) && nfs_prime_access_cache &&
  991             nfsaccess_cache_timeout > 0) {
  992                 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
  993                 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
  994                 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
  995                         nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
  996                         return (0);
  997                 }
  998         }
  999         error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
 1000         if (!error)
 1001                 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
 1002         if (!error) {
 1003                 /*
 1004                  * Get the local modify time for the case of a write
 1005                  * delegation.
 1006                  */
 1007                 nfscl_deleggetmodtime(vp, &vap->va_mtime);
 1008         } else if (NFS_ISV4(vp)) {
 1009                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1010         }
 1011         return (error);
 1012 }
 1013 
 1014 /*
 1015  * nfs setattr call.
 1016  */
 1017 static int
 1018 nfs_setattr(struct vop_setattr_args *ap)
 1019 {
 1020         struct vnode *vp = ap->a_vp;
 1021         struct nfsnode *np = VTONFS(vp);
 1022         struct thread *td = curthread;  /* XXX */
 1023         struct vattr *vap = ap->a_vap;
 1024         int error = 0;
 1025         u_quad_t tsize;
 1026 
 1027 #ifndef nolint
 1028         tsize = (u_quad_t)0;
 1029 #endif
 1030 
 1031         /*
 1032          * Setting of flags and marking of atimes are not supported.
 1033          */
 1034         if (vap->va_flags != VNOVAL)
 1035                 return (EOPNOTSUPP);
 1036 
 1037         /*
 1038          * Disallow write attempts if the filesystem is mounted read-only.
 1039          */
 1040         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
 1041             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
 1042             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
 1043             (vp->v_mount->mnt_flag & MNT_RDONLY))
 1044                 return (EROFS);
 1045         if (vap->va_size != VNOVAL) {
 1046                 switch (vp->v_type) {
 1047                 case VDIR:
 1048                         return (EISDIR);
 1049                 case VCHR:
 1050                 case VBLK:
 1051                 case VSOCK:
 1052                 case VFIFO:
 1053                         if (vap->va_mtime.tv_sec == VNOVAL &&
 1054                             vap->va_atime.tv_sec == VNOVAL &&
 1055                             vap->va_mode == (mode_t)VNOVAL &&
 1056                             vap->va_uid == (uid_t)VNOVAL &&
 1057                             vap->va_gid == (gid_t)VNOVAL)
 1058                                 return (0);             
 1059                         vap->va_size = VNOVAL;
 1060                         break;
 1061                 default:
 1062                         /*
 1063                          * Disallow write attempts if the filesystem is
 1064                          * mounted read-only.
 1065                          */
 1066                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
 1067                                 return (EROFS);
 1068                         /*
 1069                          *  We run vnode_pager_setsize() early (why?),
 1070                          * we must set np->n_size now to avoid vinvalbuf
 1071                          * V_SAVE races that might setsize a lower
 1072                          * value.
 1073                          */
 1074                         NFSLOCKNODE(np);
 1075                         tsize = np->n_size;
 1076                         NFSUNLOCKNODE(np);
 1077                         error = ncl_meta_setsize(vp, td, vap->va_size);
 1078                         NFSLOCKNODE(np);
 1079                         if (np->n_flag & NMODIFIED) {
 1080                             tsize = np->n_size;
 1081                             NFSUNLOCKNODE(np);
 1082                             error = ncl_vinvalbuf(vp, vap->va_size == 0 ?
 1083                                 0 : V_SAVE, td, 1);
 1084                             if (error != 0) {
 1085                                     vnode_pager_setsize(vp, tsize);
 1086                                     return (error);
 1087                             }
 1088                             /*
 1089                              * Call nfscl_delegmodtime() to set the modify time
 1090                              * locally, as required.
 1091                              */
 1092                             nfscl_delegmodtime(vp);
 1093                         } else
 1094                             NFSUNLOCKNODE(np);
 1095                         /*
 1096                          * np->n_size has already been set to vap->va_size
 1097                          * in ncl_meta_setsize(). We must set it again since
 1098                          * nfs_loadattrcache() could be called through
 1099                          * ncl_meta_setsize() and could modify np->n_size.
 1100                          */
 1101                         NFSLOCKNODE(np);
 1102                         np->n_vattr.na_size = np->n_size = vap->va_size;
 1103                         NFSUNLOCKNODE(np);
 1104                 }
 1105         } else {
 1106                 NFSLOCKNODE(np);
 1107                 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 
 1108                     (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
 1109                         NFSUNLOCKNODE(np);
 1110                         error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
 1111                         if (error == EINTR || error == EIO)
 1112                                 return (error);
 1113                 } else
 1114                         NFSUNLOCKNODE(np);
 1115         }
 1116         error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
 1117         if (error && vap->va_size != VNOVAL) {
 1118                 NFSLOCKNODE(np);
 1119                 np->n_size = np->n_vattr.na_size = tsize;
 1120                 vnode_pager_setsize(vp, tsize);
 1121                 NFSUNLOCKNODE(np);
 1122         }
 1123         return (error);
 1124 }
 1125 
 1126 /*
 1127  * Do an nfs setattr rpc.
 1128  */
 1129 static int
 1130 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
 1131     struct thread *td)
 1132 {
 1133         struct nfsnode *np = VTONFS(vp);
 1134         int error, ret, attrflag, i;
 1135         struct nfsvattr nfsva;
 1136 
 1137         if (NFS_ISV34(vp)) {
 1138                 NFSLOCKNODE(np);
 1139                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
 1140                         np->n_accesscache[i].stamp = 0;
 1141                 np->n_flag |= NDELEGMOD;
 1142                 NFSUNLOCKNODE(np);
 1143                 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
 1144         }
 1145         error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
 1146             NULL);
 1147         if (attrflag) {
 1148                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1149                 if (ret && !error)
 1150                         error = ret;
 1151         }
 1152         if (error && NFS_ISV4(vp))
 1153                 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
 1154         return (error);
 1155 }
 1156 
 1157 /*
 1158  * nfs lookup call, one step at a time...
 1159  * First look in cache
 1160  * If not found, unlock the directory nfsnode and do the rpc
 1161  */
 1162 static int
 1163 nfs_lookup(struct vop_lookup_args *ap)
 1164 {
 1165         struct componentname *cnp = ap->a_cnp;
 1166         struct vnode *dvp = ap->a_dvp;
 1167         struct vnode **vpp = ap->a_vpp;
 1168         struct mount *mp = dvp->v_mount;
 1169         int flags = cnp->cn_flags;
 1170         struct vnode *newvp;
 1171         struct nfsmount *nmp;
 1172         struct nfsnode *np, *newnp;
 1173         int error = 0, attrflag, dattrflag, ltype, ncticks;
 1174         struct thread *td = cnp->cn_thread;
 1175         struct nfsfh *nfhp;
 1176         struct nfsvattr dnfsva, nfsva;
 1177         struct vattr vattr;
 1178         struct timespec nctime;
 1179 
 1180         *vpp = NULLVP;
 1181         if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
 1182             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
 1183                 return (EROFS);
 1184         if (dvp->v_type != VDIR)
 1185                 return (ENOTDIR);
 1186         nmp = VFSTONFS(mp);
 1187         np = VTONFS(dvp);
 1188 
 1189         /* For NFSv4, wait until any remove is done. */
 1190         NFSLOCKNODE(np);
 1191         while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
 1192                 np->n_flag |= NREMOVEWANT;
 1193                 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
 1194         }
 1195         NFSUNLOCKNODE(np);
 1196 
 1197         error = vn_dir_check_exec(dvp, cnp);
 1198         if (error != 0)
 1199                 return (error);
 1200         error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
 1201         if (error > 0 && error != ENOENT)
 1202                 return (error);
 1203         if (error == -1) {
 1204                 /*
 1205                  * Lookups of "." are special and always return the
 1206                  * current directory.  cache_lookup() already handles
 1207                  * associated locking bookkeeping, etc.
 1208                  */
 1209                 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
 1210                         /* XXX: Is this really correct? */
 1211                         if (cnp->cn_nameiop != LOOKUP &&
 1212                             (flags & ISLASTCN))
 1213                                 cnp->cn_flags |= SAVENAME;
 1214                         return (0);
 1215                 }
 1216 
 1217                 /*
 1218                  * We only accept a positive hit in the cache if the
 1219                  * change time of the file matches our cached copy.
 1220                  * Otherwise, we discard the cache entry and fallback
 1221                  * to doing a lookup RPC.  We also only trust cache
 1222                  * entries for less than nm_nametimeo seconds.
 1223                  *
 1224                  * To better handle stale file handles and attributes,
 1225                  * clear the attribute cache of this node if it is a
 1226                  * leaf component, part of an open() call, and not
 1227                  * locally modified before fetching the attributes.
 1228                  * This should allow stale file handles to be detected
 1229                  * here where we can fall back to a LOOKUP RPC to
 1230                  * recover rather than having nfs_open() detect the
 1231                  * stale file handle and failing open(2) with ESTALE.
 1232                  */
 1233                 newvp = *vpp;
 1234                 newnp = VTONFS(newvp);
 1235                 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
 1236                     (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1237                     !(newnp->n_flag & NMODIFIED)) {
 1238                         NFSLOCKNODE(newnp);
 1239                         newnp->n_attrstamp = 0;
 1240                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1241                         NFSUNLOCKNODE(newnp);
 1242                 }
 1243                 if (nfscl_nodeleg(newvp, 0) == 0 ||
 1244                     ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
 1245                     VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
 1246                     timespeccmp(&vattr.va_ctime, &nctime, ==))) {
 1247                         NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
 1248                         if (cnp->cn_nameiop != LOOKUP &&
 1249                             (flags & ISLASTCN))
 1250                                 cnp->cn_flags |= SAVENAME;
 1251                         return (0);
 1252                 }
 1253                 cache_purge(newvp);
 1254                 if (dvp != newvp)
 1255                         vput(newvp);
 1256                 else 
 1257                         vrele(newvp);
 1258                 *vpp = NULLVP;
 1259         } else if (error == ENOENT) {
 1260                 if (VN_IS_DOOMED(dvp))
 1261                         return (ENOENT);
 1262                 /*
 1263                  * We only accept a negative hit in the cache if the
 1264                  * modification time of the parent directory matches
 1265                  * the cached copy in the name cache entry.
 1266                  * Otherwise, we discard all of the negative cache
 1267                  * entries for this directory.  We also only trust
 1268                  * negative cache entries for up to nm_negnametimeo
 1269                  * seconds.
 1270                  */
 1271                 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
 1272                     VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
 1273                     timespeccmp(&vattr.va_mtime, &nctime, ==)) {
 1274                         NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
 1275                         return (ENOENT);
 1276                 }
 1277                 cache_purge_negative(dvp);
 1278         }
 1279 
 1280         newvp = NULLVP;
 1281         NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses);
 1282         error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1283             cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1284             NULL);
 1285         if (dattrflag)
 1286                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1287         if (error) {
 1288                 if (newvp != NULLVP) {
 1289                         vput(newvp);
 1290                         *vpp = NULLVP;
 1291                 }
 1292 
 1293                 if (error != ENOENT) {
 1294                         if (NFS_ISV4(dvp))
 1295                                 error = nfscl_maperr(td, error, (uid_t)0,
 1296                                     (gid_t)0);
 1297                         return (error);
 1298                 }
 1299 
 1300                 /* The requested file was not found. */
 1301                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 1302                     (flags & ISLASTCN)) {
 1303                         /*
 1304                          * XXX: UFS does a full VOP_ACCESS(dvp,
 1305                          * VWRITE) here instead of just checking
 1306                          * MNT_RDONLY.
 1307                          */
 1308                         if (mp->mnt_flag & MNT_RDONLY)
 1309                                 return (EROFS);
 1310                         cnp->cn_flags |= SAVENAME;
 1311                         return (EJUSTRETURN);
 1312                 }
 1313 
 1314                 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) {
 1315                         /*
 1316                          * Cache the modification time of the parent
 1317                          * directory from the post-op attributes in
 1318                          * the name cache entry.  The negative cache
 1319                          * entry will be ignored once the directory
 1320                          * has changed.  Don't bother adding the entry
 1321                          * if the directory has already changed.
 1322                          */
 1323                         NFSLOCKNODE(np);
 1324                         if (timespeccmp(&np->n_vattr.na_mtime,
 1325                             &dnfsva.na_mtime, ==)) {
 1326                                 NFSUNLOCKNODE(np);
 1327                                 cache_enter_time(dvp, NULL, cnp,
 1328                                     &dnfsva.na_mtime, NULL);
 1329                         } else
 1330                                 NFSUNLOCKNODE(np);
 1331                 }
 1332                 return (ENOENT);
 1333         }
 1334 
 1335         /*
 1336          * Handle RENAME case...
 1337          */
 1338         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 1339                 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1340                         free(nfhp, M_NFSFH);
 1341                         return (EISDIR);
 1342                 }
 1343                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1344                     LK_EXCLUSIVE);
 1345                 if (error)
 1346                         return (error);
 1347                 newvp = NFSTOV(np);
 1348                 if (attrflag)
 1349                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1350                             0, 1);
 1351                 *vpp = newvp;
 1352                 cnp->cn_flags |= SAVENAME;
 1353                 return (0);
 1354         }
 1355 
 1356         if (flags & ISDOTDOT) {
 1357                 ltype = NFSVOPISLOCKED(dvp);
 1358                 error = vfs_busy(mp, MBF_NOWAIT);
 1359                 if (error != 0) {
 1360                         vfs_ref(mp);
 1361                         NFSVOPUNLOCK(dvp);
 1362                         error = vfs_busy(mp, 0);
 1363                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1364                         vfs_rel(mp);
 1365                         if (error == 0 && VN_IS_DOOMED(dvp)) {
 1366                                 vfs_unbusy(mp);
 1367                                 error = ENOENT;
 1368                         }
 1369                         if (error != 0)
 1370                                 return (error);
 1371                 }
 1372                 NFSVOPUNLOCK(dvp);
 1373                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1374                     cnp->cn_lkflags);
 1375                 if (error == 0)
 1376                         newvp = NFSTOV(np);
 1377                 vfs_unbusy(mp);
 1378                 if (newvp != dvp)
 1379                         NFSVOPLOCK(dvp, ltype | LK_RETRY);
 1380                 if (VN_IS_DOOMED(dvp)) {
 1381                         if (error == 0) {
 1382                                 if (newvp == dvp)
 1383                                         vrele(newvp);
 1384                                 else
 1385                                         vput(newvp);
 1386                         }
 1387                         error = ENOENT;
 1388                 }
 1389                 if (error != 0)
 1390                         return (error);
 1391                 if (attrflag)
 1392                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1393                             0, 1);
 1394         } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
 1395                 free(nfhp, M_NFSFH);
 1396                 VREF(dvp);
 1397                 newvp = dvp;
 1398                 if (attrflag)
 1399                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1400                             0, 1);
 1401         } else {
 1402                 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
 1403                     cnp->cn_lkflags);
 1404                 if (error)
 1405                         return (error);
 1406                 newvp = NFSTOV(np);
 1407                 if (attrflag)
 1408                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1409                             0, 1);
 1410                 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1411                     !(np->n_flag & NMODIFIED)) {                        
 1412                         /*
 1413                          * Flush the attribute cache when opening a
 1414                          * leaf node to ensure that fresh attributes
 1415                          * are fetched in nfs_open() since we did not
 1416                          * fetch attributes from the LOOKUP reply.
 1417                          */
 1418                         NFSLOCKNODE(np);
 1419                         np->n_attrstamp = 0;
 1420                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1421                         NFSUNLOCKNODE(np);
 1422                 }
 1423         }
 1424         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1425                 cnp->cn_flags |= SAVENAME;
 1426         if ((cnp->cn_flags & MAKEENTRY) &&
 1427             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
 1428             attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
 1429                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1430                     newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
 1431         *vpp = newvp;
 1432         return (0);
 1433 }
 1434 
 1435 /*
 1436  * nfs read call.
 1437  * Just call ncl_bioread() to do the work.
 1438  */
 1439 static int
 1440 nfs_read(struct vop_read_args *ap)
 1441 {
 1442         struct vnode *vp = ap->a_vp;
 1443 
 1444         switch (vp->v_type) {
 1445         case VREG:
 1446                 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1447         case VDIR:
 1448                 return (EISDIR);
 1449         default:
 1450                 return (EOPNOTSUPP);
 1451         }
 1452 }
 1453 
 1454 /*
 1455  * nfs readlink call
 1456  */
 1457 static int
 1458 nfs_readlink(struct vop_readlink_args *ap)
 1459 {
 1460         struct vnode *vp = ap->a_vp;
 1461 
 1462         if (vp->v_type != VLNK)
 1463                 return (EINVAL);
 1464         return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1465 }
 1466 
 1467 /*
 1468  * Do a readlink rpc.
 1469  * Called by ncl_doio() from below the buffer cache.
 1470  */
 1471 int
 1472 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1473 {
 1474         int error, ret, attrflag;
 1475         struct nfsvattr nfsva;
 1476 
 1477         error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
 1478             &attrflag, NULL);
 1479         if (attrflag) {
 1480                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1481                 if (ret && !error)
 1482                         error = ret;
 1483         }
 1484         if (error && NFS_ISV4(vp))
 1485                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1486         return (error);
 1487 }
 1488 
 1489 /*
 1490  * nfs read rpc call
 1491  * Ditto above
 1492  */
 1493 int
 1494 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1495 {
 1496         int error, ret, attrflag;
 1497         struct nfsvattr nfsva;
 1498         struct nfsmount *nmp;
 1499 
 1500         nmp = VFSTONFS(vp->v_mount);
 1501         error = EIO;
 1502         attrflag = 0;
 1503         if (NFSHASPNFS(nmp))
 1504                 error = nfscl_doiods(vp, uiop, NULL, NULL,
 1505                     NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td);
 1506         NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
 1507         if (error != 0)
 1508                 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
 1509                     &attrflag, NULL);
 1510         if (attrflag) {
 1511                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 1512                 if (ret && !error)
 1513                         error = ret;
 1514         }
 1515         if (error && NFS_ISV4(vp))
 1516                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1517         return (error);
 1518 }
 1519 
 1520 /*
 1521  * nfs write call
 1522  */
 1523 int
 1524 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1525     int *iomode, int *must_commit, int called_from_strategy)
 1526 {
 1527         struct nfsvattr nfsva;
 1528         int error, attrflag, ret;
 1529         struct nfsmount *nmp;
 1530 
 1531         nmp = VFSTONFS(vp->v_mount);
 1532         error = EIO;
 1533         attrflag = 0;
 1534         if (NFSHASPNFS(nmp))
 1535                 error = nfscl_doiods(vp, uiop, iomode, must_commit,
 1536                     NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td);
 1537         NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
 1538         if (error != 0)
 1539                 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
 1540                     uiop->uio_td, &nfsva, &attrflag, NULL,
 1541                     called_from_strategy);
 1542         if (attrflag) {
 1543                 if (VTONFS(vp)->n_flag & ND_NFSV4)
 1544                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
 1545                             1);
 1546                 else
 1547                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 1548                             1);
 1549                 if (ret && !error)
 1550                         error = ret;
 1551         }
 1552         if (DOINGASYNC(vp))
 1553                 *iomode = NFSWRITE_FILESYNC;
 1554         if (error && NFS_ISV4(vp))
 1555                 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
 1556         return (error);
 1557 }
 1558 
 1559 /*
 1560  * nfs mknod rpc
 1561  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1562  * mode set to specify the file type and the size field for rdev.
 1563  */
 1564 static int
 1565 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1566     struct vattr *vap)
 1567 {
 1568         struct nfsvattr nfsva, dnfsva;
 1569         struct vnode *newvp = NULL;
 1570         struct nfsnode *np = NULL, *dnp;
 1571         struct nfsfh *nfhp;
 1572         struct vattr vattr;
 1573         int error = 0, attrflag, dattrflag;
 1574         u_int32_t rdev;
 1575 
 1576         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1577                 rdev = vap->va_rdev;
 1578         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1579                 rdev = 0xffffffff;
 1580         else
 1581                 return (EOPNOTSUPP);
 1582         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1583                 return (error);
 1584         error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
 1585             rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 1586             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 1587         if (!error) {
 1588                 if (!nfhp)
 1589                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1590                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1591                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1592                             NULL);
 1593                 if (nfhp)
 1594                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1595                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1596         }
 1597         if (dattrflag)
 1598                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1599         if (!error) {
 1600                 newvp = NFSTOV(np);
 1601                 if (attrflag != 0) {
 1602                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1603                             0, 1);
 1604                         if (error != 0)
 1605                                 vput(newvp);
 1606                 }
 1607         }
 1608         if (!error) {
 1609                 *vpp = newvp;
 1610         } else if (NFS_ISV4(dvp)) {
 1611                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1612                     vap->va_gid);
 1613         }
 1614         dnp = VTONFS(dvp);
 1615         NFSLOCKNODE(dnp);
 1616         dnp->n_flag |= NMODIFIED;
 1617         if (!dattrflag) {
 1618                 dnp->n_attrstamp = 0;
 1619                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1620         }
 1621         NFSUNLOCKNODE(dnp);
 1622         return (error);
 1623 }
 1624 
 1625 /*
 1626  * nfs mknod vop
 1627  * just call nfs_mknodrpc() to do the work.
 1628  */
 1629 /* ARGSUSED */
 1630 static int
 1631 nfs_mknod(struct vop_mknod_args *ap)
 1632 {
 1633         return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
 1634 }
 1635 
 1636 static struct mtx nfs_cverf_mtx;
 1637 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
 1638     MTX_DEF);
 1639 
 1640 static nfsquad_t
 1641 nfs_get_cverf(void)
 1642 {
 1643         static nfsquad_t cverf;
 1644         nfsquad_t ret;
 1645         static int cverf_initialized = 0;
 1646 
 1647         mtx_lock(&nfs_cverf_mtx);
 1648         if (cverf_initialized == 0) {
 1649                 cverf.lval[0] = arc4random();
 1650                 cverf.lval[1] = arc4random();
 1651                 cverf_initialized = 1;
 1652         } else
 1653                 cverf.qval++;
 1654         ret = cverf;
 1655         mtx_unlock(&nfs_cverf_mtx);
 1656 
 1657         return (ret);
 1658 }
 1659 
 1660 /*
 1661  * nfs file create call
 1662  */
 1663 static int
 1664 nfs_create(struct vop_create_args *ap)
 1665 {
 1666         struct vnode *dvp = ap->a_dvp;
 1667         struct vattr *vap = ap->a_vap;
 1668         struct componentname *cnp = ap->a_cnp;
 1669         struct nfsnode *np = NULL, *dnp;
 1670         struct vnode *newvp = NULL;
 1671         struct nfsmount *nmp;
 1672         struct nfsvattr dnfsva, nfsva;
 1673         struct nfsfh *nfhp;
 1674         nfsquad_t cverf;
 1675         int error = 0, attrflag, dattrflag, fmode = 0;
 1676         struct vattr vattr;
 1677 
 1678         /*
 1679          * Oops, not for me..
 1680          */
 1681         if (vap->va_type == VSOCK)
 1682                 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 1683 
 1684         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
 1685                 return (error);
 1686         if (vap->va_vaflags & VA_EXCLUSIVE)
 1687                 fmode |= O_EXCL;
 1688         dnp = VTONFS(dvp);
 1689         nmp = VFSTONFS(dvp->v_mount);
 1690 again:
 1691         /* For NFSv4, wait until any remove is done. */
 1692         NFSLOCKNODE(dnp);
 1693         while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
 1694                 dnp->n_flag |= NREMOVEWANT;
 1695                 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
 1696         }
 1697         NFSUNLOCKNODE(dnp);
 1698 
 1699         cverf = nfs_get_cverf();
 1700         error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1701             vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
 1702             &nfhp, &attrflag, &dattrflag, NULL);
 1703         if (!error) {
 1704                 if (nfhp == NULL)
 1705                         (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
 1706                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
 1707                             &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
 1708                             NULL);
 1709                 if (nfhp != NULL)
 1710                         error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
 1711                             cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
 1712         }
 1713         if (dattrflag)
 1714                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1715         if (!error) {
 1716                 newvp = NFSTOV(np);
 1717                 if (attrflag == 0)
 1718                         error = nfsrpc_getattr(newvp, cnp->cn_cred,
 1719                             cnp->cn_thread, &nfsva, NULL);
 1720                 if (error == 0)
 1721                         error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 1722                             0, 1);
 1723         }
 1724         if (error) {
 1725                 if (newvp != NULL) {
 1726                         vput(newvp);
 1727                         newvp = NULL;
 1728                 }
 1729                 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
 1730                     error == NFSERR_NOTSUPP) {
 1731                         fmode &= ~O_EXCL;
 1732                         goto again;
 1733                 }
 1734         } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
 1735                 if (nfscl_checksattr(vap, &nfsva)) {
 1736                         error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
 1737                             cnp->cn_thread, &nfsva, &attrflag, NULL);
 1738                         if (error && (vap->va_uid != (uid_t)VNOVAL ||
 1739                             vap->va_gid != (gid_t)VNOVAL)) {
 1740                                 /* try again without setting uid/gid */
 1741                                 vap->va_uid = (uid_t)VNOVAL;
 1742                                 vap->va_gid = (uid_t)VNOVAL;
 1743                                 error = nfsrpc_setattr(newvp, vap, NULL, 
 1744                                     cnp->cn_cred, cnp->cn_thread, &nfsva,
 1745                                     &attrflag, NULL);
 1746                         }
 1747                         if (attrflag)
 1748                                 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 1749                                     NULL, 0, 1);
 1750                         if (error != 0)
 1751                                 vput(newvp);
 1752                 }
 1753         }
 1754         if (!error) {
 1755                 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
 1756                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 1757                             NULL);
 1758                 *ap->a_vpp = newvp;
 1759         } else if (NFS_ISV4(dvp)) {
 1760                 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
 1761                     vap->va_gid);
 1762         }
 1763         NFSLOCKNODE(dnp);
 1764         dnp->n_flag |= NMODIFIED;
 1765         if (!dattrflag) {
 1766                 dnp->n_attrstamp = 0;
 1767                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1768         }
 1769         NFSUNLOCKNODE(dnp);
 1770         return (error);
 1771 }
 1772 
 1773 /*
 1774  * nfs file remove call
 1775  * To try and make nfs semantics closer to ufs semantics, a file that has
 1776  * other processes using the vnode is renamed instead of removed and then
 1777  * removed later on the last close.
 1778  * - If v_usecount > 1
 1779  *        If a rename is not already in the works
 1780  *           call nfs_sillyrename() to set it up
 1781  *     else
 1782  *        do the remove rpc
 1783  */
 1784 static int
 1785 nfs_remove(struct vop_remove_args *ap)
 1786 {
 1787         struct vnode *vp = ap->a_vp;
 1788         struct vnode *dvp = ap->a_dvp;
 1789         struct componentname *cnp = ap->a_cnp;
 1790         struct nfsnode *np = VTONFS(vp);
 1791         int error = 0;
 1792         struct vattr vattr;
 1793 
 1794         KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
 1795         KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
 1796         if (vp->v_type == VDIR)
 1797                 error = EPERM;
 1798         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1799             VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
 1800             vattr.va_nlink > 1)) {
 1801                 /*
 1802                  * Purge the name cache so that the chance of a lookup for
 1803                  * the name succeeding while the remove is in progress is
 1804                  * minimized. Without node locking it can still happen, such
 1805                  * that an I/O op returns ESTALE, but since you get this if
 1806                  * another host removes the file..
 1807                  */
 1808                 cache_purge(vp);
 1809                 /*
 1810                  * throw away biocache buffers, mainly to avoid
 1811                  * unnecessary delayed writes later.
 1812                  */
 1813                 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1814                 if (error != EINTR && error != EIO)
 1815                         /* Do the rpc */
 1816                         error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
 1817                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1818                 /*
 1819                  * Kludge City: If the first reply to the remove rpc is lost..
 1820                  *   the reply to the retransmitted request will be ENOENT
 1821                  *   since the file was in fact removed
 1822                  *   Therefore, we cheat and return success.
 1823                  */
 1824                 if (error == ENOENT)
 1825                         error = 0;
 1826         } else if (!np->n_sillyrename)
 1827                 error = nfs_sillyrename(dvp, vp, cnp);
 1828         NFSLOCKNODE(np);
 1829         np->n_attrstamp = 0;
 1830         NFSUNLOCKNODE(np);
 1831         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1832         return (error);
 1833 }
 1834 
 1835 /*
 1836  * nfs file remove rpc called from nfs_inactive
 1837  */
 1838 int
 1839 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
 1840 {
 1841         /*
 1842          * Make sure that the directory vnode is still valid.
 1843          * XXX we should lock sp->s_dvp here.
 1844          */
 1845         if (sp->s_dvp->v_type == VBAD)
 1846                 return (0);
 1847         return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
 1848             sp->s_cred, NULL));
 1849 }
 1850 
 1851 /*
 1852  * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
 1853  */
 1854 static int
 1855 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
 1856     int namelen, struct ucred *cred, struct thread *td)
 1857 {
 1858         struct nfsvattr dnfsva;
 1859         struct nfsnode *dnp = VTONFS(dvp);
 1860         int error = 0, dattrflag;
 1861 
 1862         NFSLOCKNODE(dnp);
 1863         dnp->n_flag |= NREMOVEINPROG;
 1864         NFSUNLOCKNODE(dnp);
 1865         error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
 1866             &dattrflag, NULL);
 1867         NFSLOCKNODE(dnp);
 1868         if ((dnp->n_flag & NREMOVEWANT)) {
 1869                 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
 1870                 NFSUNLOCKNODE(dnp);
 1871                 wakeup((caddr_t)dnp);
 1872         } else {
 1873                 dnp->n_flag &= ~NREMOVEINPROG;
 1874                 NFSUNLOCKNODE(dnp);
 1875         }
 1876         if (dattrflag)
 1877                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 1878         NFSLOCKNODE(dnp);
 1879         dnp->n_flag |= NMODIFIED;
 1880         if (!dattrflag) {
 1881                 dnp->n_attrstamp = 0;
 1882                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1883         }
 1884         NFSUNLOCKNODE(dnp);
 1885         if (error && NFS_ISV4(dvp))
 1886                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 1887         return (error);
 1888 }
 1889 
 1890 /*
 1891  * nfs file rename call
 1892  */
 1893 static int
 1894 nfs_rename(struct vop_rename_args *ap)
 1895 {
 1896         struct vnode *fvp = ap->a_fvp;
 1897         struct vnode *tvp = ap->a_tvp;
 1898         struct vnode *fdvp = ap->a_fdvp;
 1899         struct vnode *tdvp = ap->a_tdvp;
 1900         struct componentname *tcnp = ap->a_tcnp;
 1901         struct componentname *fcnp = ap->a_fcnp;
 1902         struct nfsnode *fnp = VTONFS(ap->a_fvp);
 1903         struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
 1904         struct nfsv4node *newv4 = NULL;
 1905         int error;
 1906 
 1907         KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
 1908             (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
 1909         /* Check for cross-device rename */
 1910         if ((fvp->v_mount != tdvp->v_mount) ||
 1911             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1912                 error = EXDEV;
 1913                 goto out;
 1914         }
 1915 
 1916         if (fvp == tvp) {
 1917                 printf("nfs_rename: fvp == tvp (can't happen)\n");
 1918                 error = 0;
 1919                 goto out;
 1920         }
 1921         if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
 1922                 goto out;
 1923 
 1924         /*
 1925          * We have to flush B_DELWRI data prior to renaming
 1926          * the file.  If we don't, the delayed-write buffers
 1927          * can be flushed out later after the file has gone stale
 1928          * under NFSV3.  NFSV2 does not have this problem because
 1929          * ( as far as I can tell ) it flushes dirty buffers more
 1930          * often.
 1931          * 
 1932          * Skip the rename operation if the fsync fails, this can happen
 1933          * due to the server's volume being full, when we pushed out data
 1934          * that was written back to our cache earlier. Not checking for
 1935          * this condition can result in potential (silent) data loss.
 1936          */
 1937         error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1938         NFSVOPUNLOCK(fvp);
 1939         if (!error && tvp)
 1940                 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1941         if (error)
 1942                 goto out;
 1943 
 1944         /*
 1945          * If the tvp exists and is in use, sillyrename it before doing the
 1946          * rename of the new file over it.
 1947          * XXX Can't sillyrename a directory.
 1948          */
 1949         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1950                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1951                 vput(tvp);
 1952                 tvp = NULL;
 1953         }
 1954 
 1955         error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1956             tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1957             tcnp->cn_thread);
 1958 
 1959         if (error == 0 && NFS_ISV4(tdvp)) {
 1960                 /*
 1961                  * For NFSv4, check to see if it is the same name and
 1962                  * replace the name, if it is different.
 1963                  */
 1964                 newv4 = malloc(
 1965                     sizeof (struct nfsv4node) +
 1966                     tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
 1967                     M_NFSV4NODE, M_WAITOK);
 1968                 NFSLOCKNODE(tdnp);
 1969                 NFSLOCKNODE(fnp);
 1970                 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
 1971                     (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
 1972                       NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
 1973                       tcnp->cn_namelen) ||
 1974                       tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
 1975                       NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1976                         tdnp->n_fhp->nfh_len))) {
 1977 #ifdef notdef
 1978 { char nnn[100]; int nnnl;
 1979 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
 1980 bcopy(tcnp->cn_nameptr, nnn, nnnl);
 1981 nnn[nnnl] = '\0';
 1982 printf("ren replace=%s\n",nnn);
 1983 }
 1984 #endif
 1985                         free(fnp->n_v4, M_NFSV4NODE);
 1986                         fnp->n_v4 = newv4;
 1987                         newv4 = NULL;
 1988                         fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
 1989                         fnp->n_v4->n4_namelen = tcnp->cn_namelen;
 1990                         NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
 1991                             tdnp->n_fhp->nfh_len);
 1992                         NFSBCOPY(tcnp->cn_nameptr,
 1993                             NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
 1994                 }
 1995                 NFSUNLOCKNODE(tdnp);
 1996                 NFSUNLOCKNODE(fnp);
 1997                 if (newv4 != NULL)
 1998                         free(newv4, M_NFSV4NODE);
 1999         }
 2000 
 2001         if (fvp->v_type == VDIR) {
 2002                 if (tvp != NULL && tvp->v_type == VDIR)
 2003                         cache_purge(tdvp);
 2004                 cache_purge(fdvp);
 2005         }
 2006 
 2007 out:
 2008         if (tdvp == tvp)
 2009                 vrele(tdvp);
 2010         else
 2011                 vput(tdvp);
 2012         if (tvp)
 2013                 vput(tvp);
 2014         vrele(fdvp);
 2015         vrele(fvp);
 2016         /*
 2017          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 2018          */
 2019         if (error == ENOENT)
 2020                 error = 0;
 2021         return (error);
 2022 }
 2023 
 2024 /*
 2025  * nfs file rename rpc called from nfs_remove() above
 2026  */
 2027 static int
 2028 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
 2029     struct sillyrename *sp)
 2030 {
 2031 
 2032         return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
 2033             sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
 2034             scnp->cn_thread));
 2035 }
 2036 
 2037 /*
 2038  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 2039  */
 2040 static int
 2041 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
 2042     int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
 2043     int tnamelen, struct ucred *cred, struct thread *td)
 2044 {
 2045         struct nfsvattr fnfsva, tnfsva;
 2046         struct nfsnode *fdnp = VTONFS(fdvp);
 2047         struct nfsnode *tdnp = VTONFS(tdvp);
 2048         int error = 0, fattrflag, tattrflag;
 2049 
 2050         error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
 2051             tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
 2052             &tattrflag, NULL, NULL);
 2053         NFSLOCKNODE(fdnp);
 2054         fdnp->n_flag |= NMODIFIED;
 2055         if (fattrflag != 0) {
 2056                 NFSUNLOCKNODE(fdnp);
 2057                 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
 2058         } else {
 2059                 fdnp->n_attrstamp = 0;
 2060                 NFSUNLOCKNODE(fdnp);
 2061                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
 2062         }
 2063         NFSLOCKNODE(tdnp);
 2064         tdnp->n_flag |= NMODIFIED;
 2065         if (tattrflag != 0) {
 2066                 NFSUNLOCKNODE(tdnp);
 2067                 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
 2068         } else {
 2069                 tdnp->n_attrstamp = 0;
 2070                 NFSUNLOCKNODE(tdnp);
 2071                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 2072         }
 2073         if (error && NFS_ISV4(fdvp))
 2074                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2075         return (error);
 2076 }
 2077 
 2078 /*
 2079  * nfs hard link create call
 2080  */
 2081 static int
 2082 nfs_link(struct vop_link_args *ap)
 2083 {
 2084         struct vnode *vp = ap->a_vp;
 2085         struct vnode *tdvp = ap->a_tdvp;
 2086         struct componentname *cnp = ap->a_cnp;
 2087         struct nfsnode *np, *tdnp;
 2088         struct nfsvattr nfsva, dnfsva;
 2089         int error = 0, attrflag, dattrflag;
 2090 
 2091         /*
 2092          * Push all writes to the server, so that the attribute cache
 2093          * doesn't get "out of sync" with the server.
 2094          * XXX There should be a better way!
 2095          */
 2096         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 2097 
 2098         error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
 2099             cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
 2100             &dattrflag, NULL);
 2101         tdnp = VTONFS(tdvp);
 2102         NFSLOCKNODE(tdnp);
 2103         tdnp->n_flag |= NMODIFIED;
 2104         if (dattrflag != 0) {
 2105                 NFSUNLOCKNODE(tdnp);
 2106                 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
 2107         } else {
 2108                 tdnp->n_attrstamp = 0;
 2109                 NFSUNLOCKNODE(tdnp);
 2110                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 2111         }
 2112         if (attrflag)
 2113                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2114         else {
 2115                 np = VTONFS(vp);
 2116                 NFSLOCKNODE(np);
 2117                 np->n_attrstamp = 0;
 2118                 NFSUNLOCKNODE(np);
 2119                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 2120         }
 2121         /*
 2122          * If negative lookup caching is enabled, I might as well
 2123          * add an entry for this node. Not necessary for correctness,
 2124          * but if negative caching is enabled, then the system
 2125          * must care about lookup caching hit rate, so...
 2126          */
 2127         if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
 2128             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 2129                 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
 2130         }
 2131         if (error && NFS_ISV4(vp))
 2132                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2133                     (gid_t)0);
 2134         return (error);
 2135 }
 2136 
 2137 /*
 2138  * nfs symbolic link create call
 2139  */
 2140 static int
 2141 nfs_symlink(struct vop_symlink_args *ap)
 2142 {
 2143         struct vnode *dvp = ap->a_dvp;
 2144         struct vattr *vap = ap->a_vap;
 2145         struct componentname *cnp = ap->a_cnp;
 2146         struct nfsvattr nfsva, dnfsva;
 2147         struct nfsfh *nfhp;
 2148         struct nfsnode *np = NULL, *dnp;
 2149         struct vnode *newvp = NULL;
 2150         int error = 0, attrflag, dattrflag, ret;
 2151 
 2152         vap->va_type = VLNK;
 2153         error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2154             ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
 2155             &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
 2156         if (nfhp) {
 2157                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2158                     &np, NULL, LK_EXCLUSIVE);
 2159                 if (!ret)
 2160                         newvp = NFSTOV(np);
 2161                 else if (!error)
 2162                         error = ret;
 2163         }
 2164         if (newvp != NULL) {
 2165                 if (attrflag)
 2166                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2167                             0, 1);
 2168         } else if (!error) {
 2169                 /*
 2170                  * If we do not have an error and we could not extract the
 2171                  * newvp from the response due to the request being NFSv2, we
 2172                  * have to do a lookup in order to obtain a newvp to return.
 2173                  */
 2174                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2175                     cnp->cn_cred, cnp->cn_thread, &np);
 2176                 if (!error)
 2177                         newvp = NFSTOV(np);
 2178         }
 2179         if (error) {
 2180                 if (newvp)
 2181                         vput(newvp);
 2182                 if (NFS_ISV4(dvp))
 2183                         error = nfscl_maperr(cnp->cn_thread, error,
 2184                             vap->va_uid, vap->va_gid);
 2185         } else {
 2186                 *ap->a_vpp = newvp;
 2187         }
 2188 
 2189         dnp = VTONFS(dvp);
 2190         NFSLOCKNODE(dnp);
 2191         dnp->n_flag |= NMODIFIED;
 2192         if (dattrflag != 0) {
 2193                 NFSUNLOCKNODE(dnp);
 2194                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2195         } else {
 2196                 dnp->n_attrstamp = 0;
 2197                 NFSUNLOCKNODE(dnp);
 2198                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2199         }
 2200         /*
 2201          * If negative lookup caching is enabled, I might as well
 2202          * add an entry for this node. Not necessary for correctness,
 2203          * but if negative caching is enabled, then the system
 2204          * must care about lookup caching hit rate, so...
 2205          */
 2206         if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2207             (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
 2208                 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
 2209         }
 2210         return (error);
 2211 }
 2212 
 2213 /*
 2214  * nfs make dir call
 2215  */
 2216 static int
 2217 nfs_mkdir(struct vop_mkdir_args *ap)
 2218 {
 2219         struct vnode *dvp = ap->a_dvp;
 2220         struct vattr *vap = ap->a_vap;
 2221         struct componentname *cnp = ap->a_cnp;
 2222         struct nfsnode *np = NULL, *dnp;
 2223         struct vnode *newvp = NULL;
 2224         struct vattr vattr;
 2225         struct nfsfh *nfhp;
 2226         struct nfsvattr nfsva, dnfsva;
 2227         int error = 0, attrflag, dattrflag, ret;
 2228 
 2229         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
 2230                 return (error);
 2231         vap->va_type = VDIR;
 2232         error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2233             vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
 2234             &attrflag, &dattrflag, NULL);
 2235         dnp = VTONFS(dvp);
 2236         NFSLOCKNODE(dnp);
 2237         dnp->n_flag |= NMODIFIED;
 2238         if (dattrflag != 0) {
 2239                 NFSUNLOCKNODE(dnp);
 2240                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2241         } else {
 2242                 dnp->n_attrstamp = 0;
 2243                 NFSUNLOCKNODE(dnp);
 2244                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2245         }
 2246         if (nfhp) {
 2247                 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
 2248                     &np, NULL, LK_EXCLUSIVE);
 2249                 if (!ret) {
 2250                         newvp = NFSTOV(np);
 2251                         if (attrflag)
 2252                            (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
 2253                                 NULL, 0, 1);
 2254                 } else if (!error)
 2255                         error = ret;
 2256         }
 2257         if (!error && newvp == NULL) {
 2258                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2259                     cnp->cn_cred, cnp->cn_thread, &np);
 2260                 if (!error) {
 2261                         newvp = NFSTOV(np);
 2262                         if (newvp->v_type != VDIR)
 2263                                 error = EEXIST;
 2264                 }
 2265         }
 2266         if (error) {
 2267                 if (newvp)
 2268                         vput(newvp);
 2269                 if (NFS_ISV4(dvp))
 2270                         error = nfscl_maperr(cnp->cn_thread, error,
 2271                             vap->va_uid, vap->va_gid);
 2272         } else {
 2273                 /*
 2274                  * If negative lookup caching is enabled, I might as well
 2275                  * add an entry for this node. Not necessary for correctness,
 2276                  * but if negative caching is enabled, then the system
 2277                  * must care about lookup caching hit rate, so...
 2278                  */
 2279                 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
 2280                     (cnp->cn_flags & MAKEENTRY) &&
 2281                     attrflag != 0 && dattrflag != 0)
 2282                         cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
 2283                             &dnfsva.na_ctime);
 2284                 *ap->a_vpp = newvp;
 2285         }
 2286         return (error);
 2287 }
 2288 
 2289 /*
 2290  * nfs remove directory call
 2291  */
 2292 static int
 2293 nfs_rmdir(struct vop_rmdir_args *ap)
 2294 {
 2295         struct vnode *vp = ap->a_vp;
 2296         struct vnode *dvp = ap->a_dvp;
 2297         struct componentname *cnp = ap->a_cnp;
 2298         struct nfsnode *dnp;
 2299         struct nfsvattr dnfsva;
 2300         int error, dattrflag;
 2301 
 2302         if (dvp == vp)
 2303                 return (EINVAL);
 2304         error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2305             cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
 2306         dnp = VTONFS(dvp);
 2307         NFSLOCKNODE(dnp);
 2308         dnp->n_flag |= NMODIFIED;
 2309         if (dattrflag != 0) {
 2310                 NFSUNLOCKNODE(dnp);
 2311                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2312         } else {
 2313                 dnp->n_attrstamp = 0;
 2314                 NFSUNLOCKNODE(dnp);
 2315                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2316         }
 2317 
 2318         cache_purge(dvp);
 2319         cache_purge(vp);
 2320         if (error && NFS_ISV4(dvp))
 2321                 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
 2322                     (gid_t)0);
 2323         /*
 2324          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 2325          */
 2326         if (error == ENOENT)
 2327                 error = 0;
 2328         return (error);
 2329 }
 2330 
 2331 /*
 2332  * nfs readdir call
 2333  */
 2334 static int
 2335 nfs_readdir(struct vop_readdir_args *ap)
 2336 {
 2337         struct vnode *vp = ap->a_vp;
 2338         struct nfsnode *np = VTONFS(vp);
 2339         struct uio *uio = ap->a_uio;
 2340         ssize_t tresid, left;
 2341         int error = 0;
 2342         struct vattr vattr;
 2343 
 2344         if (ap->a_eofflag != NULL)
 2345                 *ap->a_eofflag = 0;
 2346         if (vp->v_type != VDIR) 
 2347                 return(EPERM);
 2348 
 2349         /*
 2350          * First, check for hit on the EOF offset cache
 2351          */
 2352         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 2353             (np->n_flag & NMODIFIED) == 0) {
 2354                 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
 2355                         NFSLOCKNODE(np);
 2356                         if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
 2357                             !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 2358                                 NFSUNLOCKNODE(np);
 2359                                 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits);
 2360                                 if (ap->a_eofflag != NULL)
 2361                                         *ap->a_eofflag = 1;
 2362                                 return (0);
 2363                         } else
 2364                                 NFSUNLOCKNODE(np);
 2365                 }
 2366         }
 2367 
 2368         /*
 2369          * NFS always guarantees that directory entries don't straddle
 2370          * DIRBLKSIZ boundaries.  As such, we need to limit the size
 2371          * to an exact multiple of DIRBLKSIZ, to avoid copying a partial
 2372          * directory entry.
 2373          */
 2374         left = uio->uio_resid % DIRBLKSIZ;
 2375         if (left == uio->uio_resid)
 2376                 return (EINVAL);
 2377         uio->uio_resid -= left;
 2378 
 2379         /*
 2380          * Call ncl_bioread() to do the real work.
 2381          */
 2382         tresid = uio->uio_resid;
 2383         error = ncl_bioread(vp, uio, 0, ap->a_cred);
 2384 
 2385         if (!error && uio->uio_resid == tresid) {
 2386                 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses);
 2387                 if (ap->a_eofflag != NULL)
 2388                         *ap->a_eofflag = 1;
 2389         }
 2390 
 2391         /* Add the partial DIRBLKSIZ (left) back in. */
 2392         uio->uio_resid += left;
 2393         return (error);
 2394 }
 2395 
 2396 /*
 2397  * Readdir rpc call.
 2398  * Called from below the buffer cache by ncl_doio().
 2399  */
 2400 int
 2401 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2402     struct thread *td)
 2403 {
 2404         struct nfsvattr nfsva;
 2405         nfsuint64 *cookiep, cookie;
 2406         struct nfsnode *dnp = VTONFS(vp);
 2407         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2408         int error = 0, eof, attrflag;
 2409 
 2410         KASSERT(uiop->uio_iovcnt == 1 &&
 2411             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2412             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2413             ("nfs readdirrpc bad uio"));
 2414 
 2415         /*
 2416          * If there is no cookie, assume directory was stale.
 2417          */
 2418         ncl_dircookie_lock(dnp);
 2419         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2420         if (cookiep) {
 2421                 cookie = *cookiep;
 2422                 ncl_dircookie_unlock(dnp);
 2423         } else {
 2424                 ncl_dircookie_unlock(dnp);              
 2425                 return (NFSERR_BAD_COOKIE);
 2426         }
 2427 
 2428         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2429                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2430 
 2431         error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
 2432             &attrflag, &eof, NULL);
 2433         if (attrflag)
 2434                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2435 
 2436         if (!error) {
 2437                 /*
 2438                  * We are now either at the end of the directory or have filled
 2439                  * the block.
 2440                  */
 2441                 if (eof)
 2442                         dnp->n_direofoffset = uiop->uio_offset;
 2443                 else {
 2444                         if (uiop->uio_resid > 0)
 2445                                 printf("EEK! readdirrpc resid > 0\n");
 2446                         ncl_dircookie_lock(dnp);
 2447                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2448                         *cookiep = cookie;
 2449                         ncl_dircookie_unlock(dnp);
 2450                 }
 2451         } else if (NFS_ISV4(vp)) {
 2452                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2453         }
 2454         return (error);
 2455 }
 2456 
 2457 /*
 2458  * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
 2459  */
 2460 int
 2461 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 2462     struct thread *td)
 2463 {
 2464         struct nfsvattr nfsva;
 2465         nfsuint64 *cookiep, cookie;
 2466         struct nfsnode *dnp = VTONFS(vp);
 2467         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2468         int error = 0, attrflag, eof;
 2469 
 2470         KASSERT(uiop->uio_iovcnt == 1 &&
 2471             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2472             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2473             ("nfs readdirplusrpc bad uio"));
 2474 
 2475         /*
 2476          * If there is no cookie, assume directory was stale.
 2477          */
 2478         ncl_dircookie_lock(dnp);
 2479         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
 2480         if (cookiep) {
 2481                 cookie = *cookiep;
 2482                 ncl_dircookie_unlock(dnp);
 2483         } else {
 2484                 ncl_dircookie_unlock(dnp);
 2485                 return (NFSERR_BAD_COOKIE);
 2486         }
 2487 
 2488         if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
 2489                 (void)ncl_fsinfo(nmp, vp, cred, td);
 2490         error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
 2491             &attrflag, &eof, NULL);
 2492         if (attrflag)
 2493                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 2494 
 2495         if (!error) {
 2496                 /*
 2497                  * We are now either at end of the directory or have filled the
 2498                  * the block.
 2499                  */
 2500                 if (eof)
 2501                         dnp->n_direofoffset = uiop->uio_offset;
 2502                 else {
 2503                         if (uiop->uio_resid > 0)
 2504                                 printf("EEK! readdirplusrpc resid > 0\n");
 2505                         ncl_dircookie_lock(dnp);
 2506                         cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
 2507                         *cookiep = cookie;
 2508                         ncl_dircookie_unlock(dnp);
 2509                 }
 2510         } else if (NFS_ISV4(vp)) {
 2511                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2512         }
 2513         return (error);
 2514 }
 2515 
 2516 /*
 2517  * Silly rename. To make the NFS filesystem that is stateless look a little
 2518  * more like the "ufs" a remove of an active vnode is translated to a rename
 2519  * to a funny looking filename that is removed by nfs_inactive on the
 2520  * nfsnode. There is the potential for another process on a different client
 2521  * to create the same funny name between the nfs_lookitup() fails and the
 2522  * nfs_rename() completes, but...
 2523  */
 2524 static int
 2525 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2526 {
 2527         struct sillyrename *sp;
 2528         struct nfsnode *np;
 2529         int error;
 2530         short pid;
 2531         unsigned int lticks;
 2532 
 2533         cache_purge(dvp);
 2534         np = VTONFS(vp);
 2535         KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
 2536         sp = malloc(sizeof (struct sillyrename),
 2537             M_NEWNFSREQ, M_WAITOK);
 2538         sp->s_cred = crhold(cnp->cn_cred);
 2539         sp->s_dvp = dvp;
 2540         VREF(dvp);
 2541 
 2542         /* 
 2543          * Fudge together a funny name.
 2544          * Changing the format of the funny name to accommodate more 
 2545          * sillynames per directory.
 2546          * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 
 2547          * CPU ticks since boot.
 2548          */
 2549         pid = cnp->cn_thread->td_proc->p_pid;
 2550         lticks = (unsigned int)ticks;
 2551         for ( ; ; ) {
 2552                 sp->s_namlen = sprintf(sp->s_name, 
 2553                                        ".nfs.%08x.%04x4.4", lticks, 
 2554                                        pid);
 2555                 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2556                                  cnp->cn_thread, NULL))
 2557                         break;
 2558                 lticks++;
 2559         }
 2560         error = nfs_renameit(dvp, vp, cnp, sp);
 2561         if (error)
 2562                 goto bad;
 2563         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2564                 cnp->cn_thread, &np);
 2565         np->n_sillyrename = sp;
 2566         return (0);
 2567 bad:
 2568         vrele(sp->s_dvp);
 2569         crfree(sp->s_cred);
 2570         free(sp, M_NEWNFSREQ);
 2571         return (error);
 2572 }
 2573 
 2574 /*
 2575  * Look up a file name and optionally either update the file handle or
 2576  * allocate an nfsnode, depending on the value of npp.
 2577  * npp == NULL  --> just do the lookup
 2578  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2579  *                      handled too
 2580  * *npp != NULL --> update the file handle in the vnode
 2581  */
 2582 static int
 2583 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
 2584     struct thread *td, struct nfsnode **npp)
 2585 {
 2586         struct vnode *newvp = NULL, *vp;
 2587         struct nfsnode *np, *dnp = VTONFS(dvp);
 2588         struct nfsfh *nfhp, *onfhp;
 2589         struct nfsvattr nfsva, dnfsva;
 2590         struct componentname cn;
 2591         int error = 0, attrflag, dattrflag;
 2592         u_int hash;
 2593 
 2594         error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
 2595             &nfhp, &attrflag, &dattrflag, NULL);
 2596         if (dattrflag)
 2597                 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
 2598         if (npp && !error) {
 2599                 if (*npp != NULL) {
 2600                     np = *npp;
 2601                     vp = NFSTOV(np);
 2602                     /*
 2603                      * For NFSv4, check to see if it is the same name and
 2604                      * replace the name, if it is different.
 2605                      */
 2606                     if (np->n_v4 != NULL && nfsva.na_type == VREG &&
 2607                         (np->n_v4->n4_namelen != len ||
 2608                          NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
 2609                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
 2610                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2611                          dnp->n_fhp->nfh_len))) {
 2612 #ifdef notdef
 2613 { char nnn[100]; int nnnl;
 2614 nnnl = (len < 100) ? len : 99;
 2615 bcopy(name, nnn, nnnl);
 2616 nnn[nnnl] = '\0';
 2617 printf("replace=%s\n",nnn);
 2618 }
 2619 #endif
 2620                             free(np->n_v4, M_NFSV4NODE);
 2621                             np->n_v4 = malloc(
 2622                                 sizeof (struct nfsv4node) +
 2623                                 dnp->n_fhp->nfh_len + len - 1,
 2624                                 M_NFSV4NODE, M_WAITOK);
 2625                             np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
 2626                             np->n_v4->n4_namelen = len;
 2627                             NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
 2628                                 dnp->n_fhp->nfh_len);
 2629                             NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
 2630                     }
 2631                     hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
 2632                         FNV1_32_INIT);
 2633                     onfhp = np->n_fhp;
 2634                     /*
 2635                      * Rehash node for new file handle.
 2636                      */
 2637                     vfs_hash_rehash(vp, hash);
 2638                     np->n_fhp = nfhp;
 2639                     if (onfhp != NULL)
 2640                         free(onfhp, M_NFSFH);
 2641                     newvp = NFSTOV(np);
 2642                 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
 2643                     free(nfhp, M_NFSFH);
 2644                     VREF(dvp);
 2645                     newvp = dvp;
 2646                 } else {
 2647                     cn.cn_nameptr = name;
 2648                     cn.cn_namelen = len;
 2649                     error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
 2650                         &np, NULL, LK_EXCLUSIVE);
 2651                     if (error)
 2652                         return (error);
 2653                     newvp = NFSTOV(np);
 2654                 }
 2655                 if (!attrflag && *npp == NULL) {
 2656                         if (newvp == dvp)
 2657                                 vrele(newvp);
 2658                         else
 2659                                 vput(newvp);
 2660                         return (ENOENT);
 2661                 }
 2662                 if (attrflag)
 2663                         (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
 2664                             0, 1);
 2665         }
 2666         if (npp && *npp == NULL) {
 2667                 if (error) {
 2668                         if (newvp) {
 2669                                 if (newvp == dvp)
 2670                                         vrele(newvp);
 2671                                 else
 2672                                         vput(newvp);
 2673                         }
 2674                 } else
 2675                         *npp = np;
 2676         }
 2677         if (error && NFS_ISV4(dvp))
 2678                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2679         return (error);
 2680 }
 2681 
 2682 /*
 2683  * Nfs Version 3 and 4 commit rpc
 2684  */
 2685 int
 2686 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2687    struct thread *td)
 2688 {
 2689         struct nfsvattr nfsva;
 2690         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2691         struct nfsnode *np;
 2692         struct uio uio;
 2693         int error, attrflag;
 2694 
 2695         np = VTONFS(vp);
 2696         error = EIO;
 2697         attrflag = 0;
 2698         if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) {
 2699                 uio.uio_offset = offset;
 2700                 uio.uio_resid = cnt;
 2701                 error = nfscl_doiods(vp, &uio, NULL, NULL,
 2702                     NFSV4OPEN_ACCESSWRITE, 1, cred, td);
 2703                 if (error != 0) {
 2704                         NFSLOCKNODE(np);
 2705                         np->n_flag &= ~NDSCOMMIT;
 2706                         NFSUNLOCKNODE(np);
 2707                 }
 2708         }
 2709         if (error != 0) {
 2710                 mtx_lock(&nmp->nm_mtx);
 2711                 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
 2712                         mtx_unlock(&nmp->nm_mtx);
 2713                         return (0);
 2714                 }
 2715                 mtx_unlock(&nmp->nm_mtx);
 2716                 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
 2717                     &attrflag, NULL);
 2718         }
 2719         if (attrflag != 0)
 2720                 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
 2721                     0, 1);
 2722         if (error != 0 && NFS_ISV4(vp))
 2723                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 2724         return (error);
 2725 }
 2726 
 2727 /*
 2728  * Strategy routine.
 2729  * For async requests when nfsiod(s) are running, queue the request by
 2730  * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
 2731  * request.
 2732  */
 2733 static int
 2734 nfs_strategy(struct vop_strategy_args *ap)
 2735 {
 2736         struct buf *bp;
 2737         struct vnode *vp;
 2738         struct ucred *cr;
 2739 
 2740         bp = ap->a_bp;
 2741         vp = ap->a_vp;
 2742         KASSERT(bp->b_vp == vp, ("missing b_getvp"));
 2743         KASSERT(!(bp->b_flags & B_DONE),
 2744             ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2745 
 2746         if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno)
 2747                 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize /
 2748                     DEV_BSIZE);
 2749         if (bp->b_iocmd == BIO_READ)
 2750                 cr = bp->b_rcred;
 2751         else
 2752                 cr = bp->b_wcred;
 2753 
 2754         /*
 2755          * If the op is asynchronous and an i/o daemon is waiting
 2756          * queue the request, wake it up and wait for completion
 2757          * otherwise just do it ourselves.
 2758          */
 2759         if ((bp->b_flags & B_ASYNC) == 0 ||
 2760             ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread))
 2761                 (void) ncl_doio(vp, bp, cr, curthread, 1);
 2762         return (0);
 2763 }
 2764 
 2765 /*
 2766  * fsync vnode op. Just call ncl_flush() with commit == 1.
 2767  */
 2768 /* ARGSUSED */
 2769 static int
 2770 nfs_fsync(struct vop_fsync_args *ap)
 2771 {
 2772 
 2773         if (ap->a_vp->v_type != VREG) {
 2774                 /*
 2775                  * For NFS, metadata is changed synchronously on the server,
 2776                  * so there is nothing to flush. Also, ncl_flush() clears
 2777                  * the NMODIFIED flag and that shouldn't be done here for
 2778                  * directories.
 2779                  */
 2780                 return (0);
 2781         }
 2782         return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0));
 2783 }
 2784 
 2785 /*
 2786  * Flush all the blocks associated with a vnode.
 2787  *      Walk through the buffer pool and push any dirty pages
 2788  *      associated with the vnode.
 2789  * If the called_from_renewthread argument is TRUE, it has been called
 2790  * from the NFSv4 renew thread and, as such, cannot block indefinitely
 2791  * waiting for a buffer write to complete.
 2792  */
 2793 int
 2794 ncl_flush(struct vnode *vp, int waitfor, struct thread *td,
 2795     int commit, int called_from_renewthread)
 2796 {
 2797         struct nfsnode *np = VTONFS(vp);
 2798         struct buf *bp;
 2799         int i;
 2800         struct buf *nbp;
 2801         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2802         int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2803         int passone = 1, trycnt = 0;
 2804         u_quad_t off, endoff, toff;
 2805         struct ucred* wcred = NULL;
 2806         struct buf **bvec = NULL;
 2807         struct bufobj *bo;
 2808 #ifndef NFS_COMMITBVECSIZ
 2809 #define NFS_COMMITBVECSIZ       20
 2810 #endif
 2811         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2812         u_int bvecsize = 0, bveccount;
 2813 
 2814         if (called_from_renewthread != 0)
 2815                 slptimeo = hz;
 2816         if (nmp->nm_flag & NFSMNT_INT)
 2817                 slpflag = PCATCH;
 2818         if (!commit)
 2819                 passone = 0;
 2820         bo = &vp->v_bufobj;
 2821         /*
 2822          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2823          * server, but has not been committed to stable storage on the server
 2824          * yet. On the first pass, the byte range is worked out and the commit
 2825          * rpc is done. On the second pass, ncl_writebp() is called to do the
 2826          * job.
 2827          */
 2828 again:
 2829         off = (u_quad_t)-1;
 2830         endoff = 0;
 2831         bvecpos = 0;
 2832         if (NFS_ISV34(vp) && commit) {
 2833                 if (bvec != NULL && bvec != bvec_on_stack)
 2834                         free(bvec, M_TEMP);
 2835                 /*
 2836                  * Count up how many buffers waiting for a commit.
 2837                  */
 2838                 bveccount = 0;
 2839                 BO_LOCK(bo);
 2840                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2841                         if (!BUF_ISLOCKED(bp) &&
 2842                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2843                                 == (B_DELWRI | B_NEEDCOMMIT))
 2844                                 bveccount++;
 2845                 }
 2846                 /*
 2847                  * Allocate space to remember the list of bufs to commit.  It is
 2848                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 2849                  * If we can't get memory (for whatever reason), we will end up
 2850                  * committing the buffers one-by-one in the loop below.
 2851                  */
 2852                 if (bveccount > NFS_COMMITBVECSIZ) {
 2853                         /*
 2854                          * Release the vnode interlock to avoid a lock
 2855                          * order reversal.
 2856                          */
 2857                         BO_UNLOCK(bo);
 2858                         bvec = (struct buf **)
 2859                                 malloc(bveccount * sizeof(struct buf *),
 2860                                        M_TEMP, M_NOWAIT);
 2861                         BO_LOCK(bo);
 2862                         if (bvec == NULL) {
 2863                                 bvec = bvec_on_stack;
 2864                                 bvecsize = NFS_COMMITBVECSIZ;
 2865                         } else
 2866                                 bvecsize = bveccount;
 2867                 } else {
 2868                         bvec = bvec_on_stack;
 2869                         bvecsize = NFS_COMMITBVECSIZ;
 2870                 }
 2871                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2872                         if (bvecpos >= bvecsize)
 2873                                 break;
 2874                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2875                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2876                                 continue;
 2877                         }
 2878                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2879                             (B_DELWRI | B_NEEDCOMMIT)) {
 2880                                 BUF_UNLOCK(bp);
 2881                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2882                                 continue;
 2883                         }
 2884                         BO_UNLOCK(bo);
 2885                         bremfree(bp);
 2886                         /*
 2887                          * Work out if all buffers are using the same cred
 2888                          * so we can deal with them all with one commit.
 2889                          *
 2890                          * NOTE: we are not clearing B_DONE here, so we have
 2891                          * to do it later on in this routine if we intend to
 2892                          * initiate I/O on the bp.
 2893                          *
 2894                          * Note: to avoid loopback deadlocks, we do not
 2895                          * assign b_runningbufspace.
 2896                          */
 2897                         if (wcred == NULL)
 2898                                 wcred = bp->b_wcred;
 2899                         else if (wcred != bp->b_wcred)
 2900                                 wcred = NOCRED;
 2901                         vfs_busy_pages(bp, 1);
 2902 
 2903                         BO_LOCK(bo);
 2904                         /*
 2905                          * bp is protected by being locked, but nbp is not
 2906                          * and vfs_busy_pages() may sleep.  We have to
 2907                          * recalculate nbp.
 2908                          */
 2909                         nbp = TAILQ_NEXT(bp, b_bobufs);
 2910 
 2911                         /*
 2912                          * A list of these buffers is kept so that the
 2913                          * second loop knows which buffers have actually
 2914                          * been committed. This is necessary, since there
 2915                          * may be a race between the commit rpc and new
 2916                          * uncommitted writes on the file.
 2917                          */
 2918                         bvec[bvecpos++] = bp;
 2919                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2920                                 bp->b_dirtyoff;
 2921                         if (toff < off)
 2922                                 off = toff;
 2923                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2924                         if (toff > endoff)
 2925                                 endoff = toff;
 2926                 }
 2927                 BO_UNLOCK(bo);
 2928         }
 2929         if (bvecpos > 0) {
 2930                 /*
 2931                  * Commit data on the server, as required.
 2932                  * If all bufs are using the same wcred, then use that with
 2933                  * one call for all of them, otherwise commit each one
 2934                  * separately.
 2935                  */
 2936                 if (wcred != NOCRED)
 2937                         retv = ncl_commit(vp, off, (int)(endoff - off),
 2938                                           wcred, td);
 2939                 else {
 2940                         retv = 0;
 2941                         for (i = 0; i < bvecpos; i++) {
 2942                                 off_t off, size;
 2943                                 bp = bvec[i];
 2944                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2945                                         bp->b_dirtyoff;
 2946                                 size = (u_quad_t)(bp->b_dirtyend
 2947                                                   - bp->b_dirtyoff);
 2948                                 retv = ncl_commit(vp, off, (int)size,
 2949                                                   bp->b_wcred, td);
 2950                                 if (retv) break;
 2951                         }
 2952                 }
 2953 
 2954                 if (retv == NFSERR_STALEWRITEVERF)
 2955                         ncl_clearcommit(vp->v_mount);
 2956 
 2957                 /*
 2958                  * Now, either mark the blocks I/O done or mark the
 2959                  * blocks dirty, depending on whether the commit
 2960                  * succeeded.
 2961                  */
 2962                 for (i = 0; i < bvecpos; i++) {
 2963                         bp = bvec[i];
 2964                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 2965                         if (retv) {
 2966                                 /*
 2967                                  * Error, leave B_DELWRI intact
 2968                                  */
 2969                                 vfs_unbusy_pages(bp);
 2970                                 brelse(bp);
 2971                         } else {
 2972                                 /*
 2973                                  * Success, remove B_DELWRI ( bundirty() ).
 2974                                  *
 2975                                  * b_dirtyoff/b_dirtyend seem to be NFS
 2976                                  * specific.  We should probably move that
 2977                                  * into bundirty(). XXX
 2978                                  */
 2979                                 bufobj_wref(bo);
 2980                                 bp->b_flags |= B_ASYNC;
 2981                                 bundirty(bp);
 2982                                 bp->b_flags &= ~B_DONE;
 2983                                 bp->b_ioflags &= ~BIO_ERROR;
 2984                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2985                                 bufdone(bp);
 2986                         }
 2987                 }
 2988         }
 2989 
 2990         /*
 2991          * Start/do any write(s) that are required.
 2992          */
 2993 loop:
 2994         BO_LOCK(bo);
 2995         TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 2996                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2997                         if (waitfor != MNT_WAIT || passone)
 2998                                 continue;
 2999 
 3000                         error = BUF_TIMELOCK(bp,
 3001                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 3002                             BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
 3003                         if (error == 0) {
 3004                                 BUF_UNLOCK(bp);
 3005                                 goto loop;
 3006                         }
 3007                         if (error == ENOLCK) {
 3008                                 error = 0;
 3009                                 goto loop;
 3010                         }
 3011                         if (called_from_renewthread != 0) {
 3012                                 /*
 3013                                  * Return EIO so the flush will be retried
 3014                                  * later.
 3015                                  */
 3016                                 error = EIO;
 3017                                 goto done;
 3018                         }
 3019                         if (newnfs_sigintr(nmp, td)) {
 3020                                 error = EINTR;
 3021                                 goto done;
 3022                         }
 3023                         if (slpflag == PCATCH) {
 3024                                 slpflag = 0;
 3025                                 slptimeo = 2 * hz;
 3026                         }
 3027                         goto loop;
 3028                 }
 3029                 if ((bp->b_flags & B_DELWRI) == 0)
 3030                         panic("nfs_fsync: not dirty");
 3031                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 3032                         BUF_UNLOCK(bp);
 3033                         continue;
 3034                 }
 3035                 BO_UNLOCK(bo);
 3036                 bremfree(bp);
 3037                 bp->b_flags |= B_ASYNC;
 3038                 bwrite(bp);
 3039                 if (newnfs_sigintr(nmp, td)) {
 3040                         error = EINTR;
 3041                         goto done;
 3042                 }
 3043                 goto loop;
 3044         }
 3045         if (passone) {
 3046                 passone = 0;
 3047                 BO_UNLOCK(bo);
 3048                 goto again;
 3049         }
 3050         if (waitfor == MNT_WAIT) {
 3051                 while (bo->bo_numoutput) {
 3052                         error = bufobj_wwait(bo, slpflag, slptimeo);
 3053                         if (error) {
 3054                             BO_UNLOCK(bo);
 3055                             if (called_from_renewthread != 0) {
 3056                                 /*
 3057                                  * Return EIO so that the flush will be
 3058                                  * retried later.
 3059                                  */
 3060                                 error = EIO;
 3061                                 goto done;
 3062                             }
 3063                             error = newnfs_sigintr(nmp, td);
 3064                             if (error)
 3065                                 goto done;
 3066                             if (slpflag == PCATCH) {
 3067                                 slpflag = 0;
 3068                                 slptimeo = 2 * hz;
 3069                             }
 3070                             BO_LOCK(bo);
 3071                         }
 3072                 }
 3073                 if (bo->bo_dirty.bv_cnt != 0 && commit) {
 3074                         BO_UNLOCK(bo);
 3075                         goto loop;
 3076                 }
 3077                 /*
 3078                  * Wait for all the async IO requests to drain
 3079                  */
 3080                 BO_UNLOCK(bo);
 3081                 NFSLOCKNODE(np);
 3082                 while (np->n_directio_asyncwr > 0) {
 3083                         np->n_flag |= NFSYNCWAIT;
 3084                         error = newnfs_msleep(td, &np->n_directio_asyncwr,
 3085                             &np->n_mtx, slpflag | (PRIBIO + 1), 
 3086                             "nfsfsync", 0);
 3087                         if (error) {
 3088                                 if (newnfs_sigintr(nmp, td)) {
 3089                                         NFSUNLOCKNODE(np);
 3090                                         error = EINTR;  
 3091                                         goto done;
 3092                                 }
 3093                         }
 3094                 }
 3095                 NFSUNLOCKNODE(np);
 3096         } else
 3097                 BO_UNLOCK(bo);
 3098         if (NFSHASPNFS(nmp)) {
 3099                 nfscl_layoutcommit(vp, td);
 3100                 /*
 3101                  * Invalidate the attribute cache, since writes to a DS
 3102                  * won't update the size attribute.
 3103                  */
 3104                 NFSLOCKNODE(np);
 3105                 np->n_attrstamp = 0;
 3106         } else
 3107                 NFSLOCKNODE(np);
 3108         if (np->n_flag & NWRITEERR) {
 3109                 error = np->n_error;
 3110                 np->n_flag &= ~NWRITEERR;
 3111         }
 3112         if (commit && bo->bo_dirty.bv_cnt == 0 &&
 3113             bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
 3114                 np->n_flag &= ~NMODIFIED;
 3115         NFSUNLOCKNODE(np);
 3116 done:
 3117         if (bvec != NULL && bvec != bvec_on_stack)
 3118                 free(bvec, M_TEMP);
 3119         if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
 3120             (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
 3121             np->n_directio_asyncwr != 0)) {
 3122                 if (trycnt++ < 5) {
 3123                         /* try, try again... */
 3124                         passone = 1;
 3125                         wcred = NULL;
 3126                         bvec = NULL;
 3127                         bvecsize = 0;
 3128                         goto again;
 3129                 }
 3130                 vn_printf(vp, "ncl_flush failed");
 3131                 error = called_from_renewthread != 0 ? EIO : EBUSY;
 3132         }
 3133         return (error);
 3134 }
 3135 
 3136 /*
 3137  * NFS advisory byte-level locks.
 3138  */
 3139 static int
 3140 nfs_advlock(struct vop_advlock_args *ap)
 3141 {
 3142         struct vnode *vp = ap->a_vp;
 3143         struct ucred *cred;
 3144         struct nfsnode *np = VTONFS(ap->a_vp);
 3145         struct proc *p = (struct proc *)ap->a_id;
 3146         struct thread *td = curthread;  /* XXX */
 3147         struct vattr va;
 3148         int ret, error;
 3149         u_quad_t size;
 3150 
 3151         error = NFSVOPLOCK(vp, LK_SHARED);
 3152         if (error != 0)
 3153                 return (EBADF);
 3154         if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
 3155                 if (vp->v_type != VREG) {
 3156                         error = EINVAL;
 3157                         goto out;
 3158                 }
 3159                 if ((ap->a_flags & F_POSIX) != 0)
 3160                         cred = p->p_ucred;
 3161                 else
 3162                         cred = td->td_ucred;
 3163                 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
 3164                 if (VN_IS_DOOMED(vp)) {
 3165                         error = EBADF;
 3166                         goto out;
 3167                 }
 3168 
 3169                 /*
 3170                  * If this is unlocking a write locked region, flush and
 3171                  * commit them before unlocking. This is required by
 3172                  * RFC3530 Sec. 9.3.2.
 3173                  */
 3174                 if (ap->a_op == F_UNLCK &&
 3175                     nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
 3176                     ap->a_flags))
 3177                         (void) ncl_flush(vp, MNT_WAIT, td, 1, 0);
 3178 
 3179                 /*
 3180                  * Loop around doing the lock op, while a blocking lock
 3181                  * must wait for the lock op to succeed.
 3182                  */
 3183                 do {
 3184                         ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
 3185                             ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
 3186                         if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3187                             ap->a_op == F_SETLK) {
 3188                                 NFSVOPUNLOCK(vp);
 3189                                 error = nfs_catnap(PZERO | PCATCH, ret,
 3190                                     "ncladvl");
 3191                                 if (error)
 3192                                         return (EINTR);
 3193                                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 3194                                 if (VN_IS_DOOMED(vp)) {
 3195                                         error = EBADF;
 3196                                         goto out;
 3197                                 }
 3198                         }
 3199                 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
 3200                      ap->a_op == F_SETLK);
 3201                 if (ret == NFSERR_DENIED) {
 3202                         error = EAGAIN;
 3203                         goto out;
 3204                 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
 3205                         error = ret;
 3206                         goto out;
 3207                 } else if (ret != 0) {
 3208                         error = EACCES;
 3209                         goto out;
 3210                 }
 3211 
 3212                 /*
 3213                  * Now, if we just got a lock, invalidate data in the buffer
 3214                  * cache, as required, so that the coherency conforms with
 3215                  * RFC3530 Sec. 9.3.2.
 3216                  */
 3217                 if (ap->a_op == F_SETLK) {
 3218                         if ((np->n_flag & NMODIFIED) == 0) {
 3219                                 np->n_attrstamp = 0;
 3220                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3221                                 ret = VOP_GETATTR(vp, &va, cred);
 3222                         }
 3223                         if ((np->n_flag & NMODIFIED) || ret ||
 3224                             np->n_change != va.va_filerev) {
 3225                                 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
 3226                                 np->n_attrstamp = 0;
 3227                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 3228                                 ret = VOP_GETATTR(vp, &va, cred);
 3229                                 if (!ret) {
 3230                                         np->n_mtime = va.va_mtime;
 3231                                         np->n_change = va.va_filerev;
 3232                                 }
 3233                         }
 3234                         /* Mark that a file lock has been acquired. */
 3235                         NFSLOCKNODE(np);
 3236                         np->n_flag |= NHASBEENLOCKED;
 3237                         NFSUNLOCKNODE(np);
 3238                 }
 3239         } else if (!NFS_ISV4(vp)) {
 3240                 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3241                         size = VTONFS(vp)->n_size;
 3242                         NFSVOPUNLOCK(vp);
 3243                         error = lf_advlock(ap, &(vp->v_lockf), size);
 3244                 } else {
 3245                         if (nfs_advlock_p != NULL)
 3246                                 error = nfs_advlock_p(ap);
 3247                         else {
 3248                                 NFSVOPUNLOCK(vp);
 3249                                 error = ENOLCK;
 3250                         }
 3251                 }
 3252                 if (error == 0 && ap->a_op == F_SETLK) {
 3253                         error = NFSVOPLOCK(vp, LK_SHARED);
 3254                         if (error == 0) {
 3255                                 /* Mark that a file lock has been acquired. */
 3256                                 NFSLOCKNODE(np);
 3257                                 np->n_flag |= NHASBEENLOCKED;
 3258                                 NFSUNLOCKNODE(np);
 3259                                 NFSVOPUNLOCK(vp);
 3260                         }
 3261                 }
 3262                 return (error);
 3263         } else
 3264                 error = EOPNOTSUPP;
 3265 out:
 3266         NFSVOPUNLOCK(vp);
 3267         return (error);
 3268 }
 3269 
 3270 /*
 3271  * NFS advisory byte-level locks.
 3272  */
 3273 static int
 3274 nfs_advlockasync(struct vop_advlockasync_args *ap)
 3275 {
 3276         struct vnode *vp = ap->a_vp;
 3277         u_quad_t size;
 3278         int error;
 3279 
 3280         if (NFS_ISV4(vp))
 3281                 return (EOPNOTSUPP);
 3282         error = NFSVOPLOCK(vp, LK_SHARED);
 3283         if (error)
 3284                 return (error);
 3285         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3286                 size = VTONFS(vp)->n_size;
 3287                 NFSVOPUNLOCK(vp);
 3288                 error = lf_advlockasync(ap, &(vp->v_lockf), size);
 3289         } else {
 3290                 NFSVOPUNLOCK(vp);
 3291                 error = EOPNOTSUPP;
 3292         }
 3293         return (error);
 3294 }
 3295 
 3296 /*
 3297  * Print out the contents of an nfsnode.
 3298  */
 3299 static int
 3300 nfs_print(struct vop_print_args *ap)
 3301 {
 3302         struct vnode *vp = ap->a_vp;
 3303         struct nfsnode *np = VTONFS(vp);
 3304 
 3305         printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid,
 3306             (uintmax_t)np->n_vattr.na_fsid);
 3307         if (vp->v_type == VFIFO)
 3308                 fifo_printinfo(vp);
 3309         printf("\n");
 3310         return (0);
 3311 }
 3312 
 3313 /*
 3314  * This is the "real" nfs::bwrite(struct buf*).
 3315  * We set B_CACHE if this is a VMIO buffer.
 3316  */
 3317 int
 3318 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
 3319 {
 3320         int oldflags, rtval;
 3321 
 3322         if (bp->b_flags & B_INVAL) {
 3323                 brelse(bp);
 3324                 return (0);
 3325         }
 3326 
 3327         oldflags = bp->b_flags;
 3328         bp->b_flags |= B_CACHE;
 3329 
 3330         /*
 3331          * Undirty the bp.  We will redirty it later if the I/O fails.
 3332          */
 3333         bundirty(bp);
 3334         bp->b_flags &= ~B_DONE;
 3335         bp->b_ioflags &= ~BIO_ERROR;
 3336         bp->b_iocmd = BIO_WRITE;
 3337 
 3338         bufobj_wref(bp->b_bufobj);
 3339         curthread->td_ru.ru_oublock++;
 3340 
 3341         /*
 3342          * Note: to avoid loopback deadlocks, we do not
 3343          * assign b_runningbufspace.
 3344          */
 3345         vfs_busy_pages(bp, 1);
 3346 
 3347         BUF_KERNPROC(bp);
 3348         bp->b_iooffset = dbtob(bp->b_blkno);
 3349         bstrategy(bp);
 3350 
 3351         if ((oldflags & B_ASYNC) != 0)
 3352                 return (0);
 3353 
 3354         rtval = bufwait(bp);
 3355         if (oldflags & B_DELWRI)
 3356                 reassignbuf(bp);
 3357         brelse(bp);
 3358         return (rtval);
 3359 }
 3360 
 3361 /*
 3362  * nfs special file access vnode op.
 3363  * Essentially just get vattr and then imitate iaccess() since the device is
 3364  * local to the client.
 3365  */
 3366 static int
 3367 nfsspec_access(struct vop_access_args *ap)
 3368 {
 3369         struct vattr *vap;
 3370         struct ucred *cred = ap->a_cred;
 3371         struct vnode *vp = ap->a_vp;
 3372         accmode_t accmode = ap->a_accmode;
 3373         struct vattr vattr;
 3374         int error;
 3375 
 3376         /*
 3377          * Disallow write attempts on filesystems mounted read-only;
 3378          * unless the file is a socket, fifo, or a block or character
 3379          * device resident on the filesystem.
 3380          */
 3381         if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3382                 switch (vp->v_type) {
 3383                 case VREG:
 3384                 case VDIR:
 3385                 case VLNK:
 3386                         return (EROFS);
 3387                 default:
 3388                         break;
 3389                 }
 3390         }
 3391         vap = &vattr;
 3392         error = VOP_GETATTR(vp, vap, cred);
 3393         if (error)
 3394                 goto out;
 3395         error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
 3396             accmode, cred);
 3397 out:
 3398         return error;
 3399 }
 3400 
 3401 /*
 3402  * Read wrapper for fifos.
 3403  */
 3404 static int
 3405 nfsfifo_read(struct vop_read_args *ap)
 3406 {
 3407         struct nfsnode *np = VTONFS(ap->a_vp);
 3408         int error;
 3409 
 3410         /*
 3411          * Set access flag.
 3412          */
 3413         NFSLOCKNODE(np);
 3414         np->n_flag |= NACC;
 3415         vfs_timestamp(&np->n_atim);
 3416         NFSUNLOCKNODE(np);
 3417         error = fifo_specops.vop_read(ap);
 3418         return error;   
 3419 }
 3420 
 3421 /*
 3422  * Write wrapper for fifos.
 3423  */
 3424 static int
 3425 nfsfifo_write(struct vop_write_args *ap)
 3426 {
 3427         struct nfsnode *np = VTONFS(ap->a_vp);
 3428 
 3429         /*
 3430          * Set update flag.
 3431          */
 3432         NFSLOCKNODE(np);
 3433         np->n_flag |= NUPD;
 3434         vfs_timestamp(&np->n_mtim);
 3435         NFSUNLOCKNODE(np);
 3436         return(fifo_specops.vop_write(ap));
 3437 }
 3438 
 3439 /*
 3440  * Close wrapper for fifos.
 3441  *
 3442  * Update the times on the nfsnode then do fifo close.
 3443  */
 3444 static int
 3445 nfsfifo_close(struct vop_close_args *ap)
 3446 {
 3447         struct vnode *vp = ap->a_vp;
 3448         struct nfsnode *np = VTONFS(vp);
 3449         struct vattr vattr;
 3450         struct timespec ts;
 3451 
 3452         NFSLOCKNODE(np);
 3453         if (np->n_flag & (NACC | NUPD)) {
 3454                 vfs_timestamp(&ts);
 3455                 if (np->n_flag & NACC)
 3456                         np->n_atim = ts;
 3457                 if (np->n_flag & NUPD)
 3458                         np->n_mtim = ts;
 3459                 np->n_flag |= NCHG;
 3460                 if (vrefcnt(vp) == 1 &&
 3461                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3462                         VATTR_NULL(&vattr);
 3463                         if (np->n_flag & NACC)
 3464                                 vattr.va_atime = np->n_atim;
 3465                         if (np->n_flag & NUPD)
 3466                                 vattr.va_mtime = np->n_mtim;
 3467                         NFSUNLOCKNODE(np);
 3468                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 3469                         goto out;
 3470                 }
 3471         }
 3472         NFSUNLOCKNODE(np);
 3473 out:
 3474         return (fifo_specops.vop_close(ap));
 3475 }
 3476 
 3477 /*
 3478  * Just call ncl_writebp() with the force argument set to 1.
 3479  *
 3480  * NOTE: B_DONE may or may not be set in a_bp on call.
 3481  */
 3482 static int
 3483 nfs_bwrite(struct buf *bp)
 3484 {
 3485 
 3486         return (ncl_writebp(bp, 1, curthread));
 3487 }
 3488 
 3489 struct buf_ops buf_ops_newnfs = {
 3490         .bop_name       =       "buf_ops_nfs",
 3491         .bop_write      =       nfs_bwrite,
 3492         .bop_strategy   =       bufstrategy,
 3493         .bop_sync       =       bufsync,
 3494         .bop_bdflush    =       bufbdflush,
 3495 };
 3496 
 3497 static int
 3498 nfs_getacl(struct vop_getacl_args *ap)
 3499 {
 3500         int error;
 3501 
 3502         if (ap->a_type != ACL_TYPE_NFS4)
 3503                 return (EOPNOTSUPP);
 3504         error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3505             NULL);
 3506         if (error > NFSERR_STALE) {
 3507                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3508                 error = EPERM;
 3509         }
 3510         return (error);
 3511 }
 3512 
 3513 static int
 3514 nfs_setacl(struct vop_setacl_args *ap)
 3515 {
 3516         int error;
 3517 
 3518         if (ap->a_type != ACL_TYPE_NFS4)
 3519                 return (EOPNOTSUPP);
 3520         error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
 3521             NULL);
 3522         if (error > NFSERR_STALE) {
 3523                 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
 3524                 error = EPERM;
 3525         }
 3526         return (error);
 3527 }
 3528 
 3529 /*
 3530  * VOP_ADVISE for NFS.
 3531  * Just return 0 for any errors, since it is just a hint.
 3532  */
 3533 static int
 3534 nfs_advise(struct vop_advise_args *ap)
 3535 {
 3536         struct thread *td = curthread;
 3537         struct nfsmount *nmp;
 3538         uint64_t len;
 3539         int error;
 3540 
 3541         /*
 3542          * First do vop_stdadvise() to handle the buffer cache.
 3543          */
 3544         error = vop_stdadvise(ap);
 3545         if (error != 0)
 3546                 return (error);
 3547         if (ap->a_start < 0 || ap->a_end < 0)
 3548                 return (0);
 3549         if (ap->a_end == OFF_MAX)
 3550                 len = 0;
 3551         else if (ap->a_end < ap->a_start)
 3552                 return (0);
 3553         else
 3554                 len = ap->a_end - ap->a_start + 1;
 3555         nmp = VFSTONFS(ap->a_vp->v_mount);
 3556         mtx_lock(&nmp->nm_mtx);
 3557         if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
 3558             (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) ==
 3559             0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) {
 3560                 mtx_unlock(&nmp->nm_mtx);
 3561                 return (0);
 3562         }
 3563         mtx_unlock(&nmp->nm_mtx);
 3564         error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice,
 3565             td->td_ucred, td);
 3566         if (error == NFSERR_NOTSUPP) {
 3567                 mtx_lock(&nmp->nm_mtx);
 3568                 nmp->nm_privflag |= NFSMNTP_NOADVISE;
 3569                 mtx_unlock(&nmp->nm_mtx);
 3570         }
 3571         return (0);
 3572 }
 3573 
 3574 /*
 3575  * nfs allocate call
 3576  */
 3577 static int
 3578 nfs_allocate(struct vop_allocate_args *ap)
 3579 {
 3580         struct vnode *vp = ap->a_vp;
 3581         struct thread *td = curthread;
 3582         struct nfsvattr nfsva;
 3583         struct nfsmount *nmp;
 3584         int attrflag, error, ret;
 3585 
 3586         attrflag = 0;
 3587         nmp = VFSTONFS(vp->v_mount);
 3588         mtx_lock(&nmp->nm_mtx);
 3589         if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION &&
 3590             (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) {
 3591                 mtx_unlock(&nmp->nm_mtx);
 3592                 /*
 3593                  * Flush first to ensure that the allocate adds to the
 3594                  * file's allocation on the server.
 3595                  */
 3596                 error = ncl_flush(vp, MNT_WAIT, td, 1, 0);
 3597                 if (error == 0)
 3598                         error = nfsrpc_allocate(vp, *ap->a_offset, *ap->a_len,
 3599                             &nfsva, &attrflag, td->td_ucred, td, NULL);
 3600                 if (error == 0) {
 3601                         *ap->a_offset += *ap->a_len;
 3602                         *ap->a_len = 0;
 3603                 } else if (error == NFSERR_NOTSUPP) {
 3604                         mtx_lock(&nmp->nm_mtx);
 3605                         nmp->nm_privflag |= NFSMNTP_NOALLOCATE;
 3606                         mtx_unlock(&nmp->nm_mtx);
 3607                 }
 3608         } else {
 3609                 mtx_unlock(&nmp->nm_mtx);
 3610                 error = EIO;
 3611         }
 3612         /*
 3613          * If the NFS server cannot perform the Allocate operation, just call
 3614          * vop_stdallocate() to perform it.
 3615          */
 3616         if (error != 0)
 3617                 error = vop_stdallocate(ap);
 3618         if (attrflag != 0) {
 3619                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 3620                 if (error == 0 && ret != 0)
 3621                         error = ret;
 3622         }
 3623         if (error != 0)
 3624                 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
 3625         return (error);
 3626 }
 3627 
 3628 /*
 3629  * nfs copy_file_range call
 3630  */
 3631 static int
 3632 nfs_copy_file_range(struct vop_copy_file_range_args *ap)
 3633 {
 3634         struct vnode *invp = ap->a_invp;
 3635         struct vnode *outvp = ap->a_outvp;
 3636         struct mount *mp;
 3637         struct nfsvattr innfsva, outnfsva;
 3638         struct vattr *vap;
 3639         struct uio io;
 3640         struct nfsmount *nmp;
 3641         size_t len, len2;
 3642         int error, inattrflag, outattrflag, ret, ret2;
 3643         off_t inoff, outoff;
 3644         bool consecutive, must_commit, tryoutcred;
 3645 
 3646         ret = ret2 = 0;
 3647         nmp = VFSTONFS(invp->v_mount);
 3648         mtx_lock(&nmp->nm_mtx);
 3649         /* NFSv4.2 Copy is not permitted for infile == outfile. */
 3650         if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
 3651             (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0 || invp == outvp) {
 3652                 mtx_unlock(&nmp->nm_mtx);
 3653                 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
 3654                     ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags,
 3655                     ap->a_incred, ap->a_outcred, ap->a_fsizetd);
 3656                 return (error);
 3657         }
 3658         mtx_unlock(&nmp->nm_mtx);
 3659 
 3660         /* Lock both vnodes, avoiding risk of deadlock. */
 3661         do {
 3662                 mp = NULL;
 3663                 error = vn_start_write(outvp, &mp, V_WAIT);
 3664                 if (error == 0) {
 3665                         error = vn_lock(outvp, LK_EXCLUSIVE);
 3666                         if (error == 0) {
 3667                                 error = vn_lock(invp, LK_SHARED | LK_NOWAIT);
 3668                                 if (error == 0)
 3669                                         break;
 3670                                 VOP_UNLOCK(outvp);
 3671                                 if (mp != NULL)
 3672                                         vn_finished_write(mp);
 3673                                 mp = NULL;
 3674                                 error = vn_lock(invp, LK_SHARED);
 3675                                 if (error == 0)
 3676                                         VOP_UNLOCK(invp);
 3677                         }
 3678                 }
 3679                 if (mp != NULL)
 3680                         vn_finished_write(mp);
 3681         } while (error == 0);
 3682         if (error != 0)
 3683                 return (error);
 3684 
 3685         /*
 3686          * Do the vn_rlimit_fsize() check.  Should this be above the VOP layer?
 3687          */
 3688         io.uio_offset = *ap->a_outoffp;
 3689         io.uio_resid = *ap->a_lenp;
 3690         error = vn_rlimit_fsize(outvp, &io, ap->a_fsizetd);
 3691 
 3692         /*
 3693          * Flush the input file so that the data is up to date before
 3694          * the copy.  Flush writes for the output file so that they
 3695          * do not overwrite the data copied to the output file by the Copy.
 3696          * Set the commit argument for both flushes so that the data is on
 3697          * stable storage before the Copy RPC.  This is done in case the
 3698          * server reboots during the Copy and needs to be redone.
 3699          */
 3700         if (error == 0)
 3701                 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0);
 3702         if (error == 0)
 3703                 error = ncl_flush(outvp, MNT_WAIT, curthread, 1, 0);
 3704 
 3705         /* Do the actual NFSv4.2 RPC. */
 3706         len = *ap->a_lenp;
 3707         mtx_lock(&nmp->nm_mtx);
 3708         if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0)
 3709                 consecutive = true;
 3710         else
 3711                 consecutive = false;
 3712         mtx_unlock(&nmp->nm_mtx);
 3713         inoff = *ap->a_inoffp;
 3714         outoff = *ap->a_outoffp;
 3715         tryoutcred = true;
 3716         must_commit = false;
 3717         if (error == 0) {
 3718                 vap = &VTONFS(invp)->n_vattr.na_vattr;
 3719                 error = VOP_GETATTR(invp, vap, ap->a_incred);
 3720                 if (error == 0) {
 3721                         /*
 3722                          * Clip "len" at va_size so that RFC compliant servers
 3723                          * will not reply NFSERR_INVAL.
 3724                          * Setting "len == 0" for the RPC would be preferred,
 3725                          * but some Linux servers do not support that.
 3726                          */
 3727                         if (inoff >= vap->va_size)
 3728                                 *ap->a_lenp = len = 0;
 3729                         else if (inoff + len > vap->va_size)
 3730                                 *ap->a_lenp = len = vap->va_size - inoff;
 3731                 } else
 3732                         error = 0;
 3733         }
 3734 
 3735         /*
 3736          * len will be set to 0 upon a successful Copy RPC.
 3737          * As such, this only loops when the Copy RPC needs to be retried.
 3738          */
 3739         while (len > 0 && error == 0) {
 3740                 inattrflag = outattrflag = 0;
 3741                 len2 = len;
 3742                 if (tryoutcred)
 3743                         error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
 3744                             outvp, ap->a_outoffp, &len2, ap->a_flags,
 3745                             &inattrflag, &innfsva, &outattrflag, &outnfsva,
 3746                             ap->a_outcred, consecutive, &must_commit);
 3747                 else
 3748                         error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
 3749                             outvp, ap->a_outoffp, &len2, ap->a_flags,
 3750                             &inattrflag, &innfsva, &outattrflag, &outnfsva,
 3751                             ap->a_incred, consecutive, &must_commit);
 3752                 if (inattrflag != 0)
 3753                         ret = nfscl_loadattrcache(&invp, &innfsva, NULL, NULL,
 3754                             0, 1);
 3755                 if (outattrflag != 0)
 3756                         ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL,
 3757                             NULL, 1, 1);
 3758                 if (error == 0) {
 3759                         if (consecutive == false) {
 3760                                 if (len2 == len) {
 3761                                         mtx_lock(&nmp->nm_mtx);
 3762                                         nmp->nm_privflag |=
 3763                                             NFSMNTP_NOCONSECUTIVE;
 3764                                         mtx_unlock(&nmp->nm_mtx);
 3765                                 } else
 3766                                         error = NFSERR_OFFLOADNOREQS;
 3767                         }
 3768                         *ap->a_lenp = len2;
 3769                         len = 0;
 3770                         if (len2 > 0 && must_commit && error == 0)
 3771                                 error = ncl_commit(outvp, outoff, *ap->a_lenp,
 3772                                     ap->a_outcred, curthread);
 3773                         if (error == 0 && ret != 0)
 3774                                 error = ret;
 3775                         if (error == 0 && ret2 != 0)
 3776                                 error = ret2;
 3777                 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) {
 3778                         /*
 3779                          * Try consecutive == false, which is ok only if all
 3780                          * bytes are copied.
 3781                          * If only some bytes were copied when consecutive
 3782                          * is false, there is no way to know which bytes
 3783                          * still need to be written.
 3784                          */
 3785                         consecutive = false;
 3786                         error = 0;
 3787                 } else if (error == NFSERR_ACCES && tryoutcred) {
 3788                         /* Try again with incred. */
 3789                         tryoutcred = false;
 3790                         error = 0;
 3791                 }
 3792                 if (error == NFSERR_STALEWRITEVERF) {
 3793                         /*
 3794                          * Server rebooted, so do it all again.
 3795                          */
 3796                         *ap->a_inoffp = inoff;
 3797                         *ap->a_outoffp = outoff;
 3798                         len = *ap->a_lenp;
 3799                         must_commit = false;
 3800                         error = 0;
 3801                 }
 3802         }
 3803         VOP_UNLOCK(invp);
 3804         VOP_UNLOCK(outvp);
 3805         if (mp != NULL)
 3806                 vn_finished_write(mp);
 3807         if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS ||
 3808             error == NFSERR_ACCES) {
 3809                 /*
 3810                  * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can
 3811                  * use a_incred for the read and a_outcred for the write, so
 3812                  * try this for NFSERR_ACCES failures for the Copy.
 3813                  * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can
 3814                  * never succeed, so disable it.
 3815                  */
 3816                 if (error != NFSERR_ACCES) {
 3817                         /* Can never do Copy on this mount. */
 3818                         mtx_lock(&nmp->nm_mtx);
 3819                         nmp->nm_privflag |= NFSMNTP_NOCOPY;
 3820                         mtx_unlock(&nmp->nm_mtx);
 3821                 }
 3822                 *ap->a_inoffp = inoff;
 3823                 *ap->a_outoffp = outoff;
 3824                 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
 3825                     ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags,
 3826                     ap->a_incred, ap->a_outcred, ap->a_fsizetd);
 3827         } else if (error != 0)
 3828                 *ap->a_lenp = 0;
 3829 
 3830         if (error != 0)
 3831                 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0);
 3832         return (error);
 3833 }
 3834 
 3835 /*
 3836  * nfs ioctl call
 3837  */
 3838 static int
 3839 nfs_ioctl(struct vop_ioctl_args *ap)
 3840 {
 3841         struct vnode *vp = ap->a_vp;
 3842         struct nfsvattr nfsva;
 3843         struct nfsmount *nmp;
 3844         int attrflag, content, error, ret;
 3845         bool eof = false;                       /* shut up compiler. */
 3846 
 3847         if (vp->v_type != VREG)
 3848                 return (ENOTTY);
 3849         nmp = VFSTONFS(vp->v_mount);
 3850         if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) {
 3851                 error = vop_stdioctl(ap);
 3852                 return (error);
 3853         }
 3854 
 3855         /* Do the actual NFSv4.2 RPC. */
 3856         switch (ap->a_command) {
 3857         case FIOSEEKDATA:
 3858                 content = NFSV4CONTENT_DATA;
 3859                 break;
 3860         case FIOSEEKHOLE:
 3861                 content = NFSV4CONTENT_HOLE;
 3862                 break;
 3863         default:
 3864                 return (ENOTTY);
 3865         }
 3866 
 3867         error = vn_lock(vp, LK_SHARED);
 3868         if (error != 0)
 3869                 return (EBADF);
 3870         attrflag = 0;
 3871         if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size)
 3872                 error = ENXIO;
 3873         else {
 3874                 /*
 3875                  * Flush all writes, so that the server is up to date.
 3876                  * Although a Commit is not required, the commit argument
 3877                  * is set so that, for a pNFS File/Flexible File Layout
 3878                  * server, the LayoutCommit will be done to ensure the file
 3879                  * size is up to date on the Metadata Server.
 3880                  */
 3881                 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0);
 3882                 if (error == 0)
 3883                         error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof,
 3884                             content, ap->a_cred, &nfsva, &attrflag);
 3885                 /* If at eof for FIOSEEKDATA, return ENXIO. */
 3886                 if (eof && error == 0 && content == NFSV4CONTENT_DATA)
 3887                         error = ENXIO;
 3888         }
 3889         if (attrflag != 0) {
 3890                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 3891                 if (error == 0 && ret != 0)
 3892                         error = ret;
 3893         }
 3894         NFSVOPUNLOCK(vp);
 3895 
 3896         if (error != 0)
 3897                 error = ENXIO;
 3898         return (error);
 3899 }
 3900 
 3901 /*
 3902  * nfs getextattr call
 3903  */
 3904 static int
 3905 nfs_getextattr(struct vop_getextattr_args *ap)
 3906 {
 3907         struct vnode *vp = ap->a_vp;
 3908         struct nfsmount *nmp;
 3909         struct ucred *cred;
 3910         struct thread *td = ap->a_td;
 3911         struct nfsvattr nfsva;
 3912         ssize_t len;
 3913         int attrflag, error, ret;
 3914 
 3915         nmp = VFSTONFS(vp->v_mount);
 3916         mtx_lock(&nmp->nm_mtx);
 3917         if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
 3918             (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
 3919             ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
 3920                 mtx_unlock(&nmp->nm_mtx);
 3921                 return (EOPNOTSUPP);
 3922         }
 3923         mtx_unlock(&nmp->nm_mtx);
 3924 
 3925         cred = ap->a_cred;
 3926         if (cred == NULL)
 3927                 cred = td->td_ucred;
 3928         /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
 3929         attrflag = 0;
 3930         error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva,
 3931             &attrflag, cred, td);
 3932         if (attrflag != 0) {
 3933                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 3934                 if (error == 0 && ret != 0)
 3935                         error = ret;
 3936         }
 3937         if (error == 0 && ap->a_size != NULL)
 3938                 *ap->a_size = len;
 3939 
 3940         switch (error) {
 3941         case NFSERR_NOTSUPP:
 3942         case NFSERR_OPILLEGAL:
 3943                 mtx_lock(&nmp->nm_mtx);
 3944                 nmp->nm_privflag |= NFSMNTP_NOXATTR;
 3945                 mtx_unlock(&nmp->nm_mtx);
 3946                 error = EOPNOTSUPP;
 3947                 break;
 3948         case NFSERR_NOXATTR:
 3949         case NFSERR_XATTR2BIG:
 3950                 error = ENOATTR;
 3951                 break;
 3952         default:
 3953                 error = nfscl_maperr(td, error, 0, 0);
 3954                 break;
 3955         }
 3956         return (error);
 3957 }
 3958 
 3959 /*
 3960  * nfs setextattr call
 3961  */
 3962 static int
 3963 nfs_setextattr(struct vop_setextattr_args *ap)
 3964 {
 3965         struct vnode *vp = ap->a_vp;
 3966         struct nfsmount *nmp;
 3967         struct ucred *cred;
 3968         struct thread *td = ap->a_td;
 3969         struct nfsvattr nfsva;
 3970         int attrflag, error, ret;
 3971 
 3972         nmp = VFSTONFS(vp->v_mount);
 3973         mtx_lock(&nmp->nm_mtx);
 3974         if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
 3975             (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
 3976             ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
 3977                 mtx_unlock(&nmp->nm_mtx);
 3978                 return (EOPNOTSUPP);
 3979         }
 3980         mtx_unlock(&nmp->nm_mtx);
 3981 
 3982         if (ap->a_uio->uio_resid < 0)
 3983                 return (EINVAL);
 3984         cred = ap->a_cred;
 3985         if (cred == NULL)
 3986                 cred = td->td_ucred;
 3987         /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
 3988         attrflag = 0;
 3989         error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva,
 3990             &attrflag, cred, td);
 3991         if (attrflag != 0) {
 3992                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 3993                 if (error == 0 && ret != 0)
 3994                         error = ret;
 3995         }
 3996 
 3997         switch (error) {
 3998         case NFSERR_NOTSUPP:
 3999         case NFSERR_OPILLEGAL:
 4000                 mtx_lock(&nmp->nm_mtx);
 4001                 nmp->nm_privflag |= NFSMNTP_NOXATTR;
 4002                 mtx_unlock(&nmp->nm_mtx);
 4003                 error = EOPNOTSUPP;
 4004                 break;
 4005         case NFSERR_NOXATTR:
 4006         case NFSERR_XATTR2BIG:
 4007                 error = ENOATTR;
 4008                 break;
 4009         default:
 4010                 error = nfscl_maperr(td, error, 0, 0);
 4011                 break;
 4012         }
 4013         return (error);
 4014 }
 4015 
 4016 /*
 4017  * nfs listextattr call
 4018  */
 4019 static int
 4020 nfs_listextattr(struct vop_listextattr_args *ap)
 4021 {
 4022         struct vnode *vp = ap->a_vp;
 4023         struct nfsmount *nmp;
 4024         struct ucred *cred;
 4025         struct thread *td = ap->a_td;
 4026         struct nfsvattr nfsva;
 4027         size_t len, len2;
 4028         uint64_t cookie;
 4029         int attrflag, error, ret;
 4030         bool eof;
 4031 
 4032         nmp = VFSTONFS(vp->v_mount);
 4033         mtx_lock(&nmp->nm_mtx);
 4034         if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
 4035             (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
 4036             ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
 4037                 mtx_unlock(&nmp->nm_mtx);
 4038                 return (EOPNOTSUPP);
 4039         }
 4040         mtx_unlock(&nmp->nm_mtx);
 4041 
 4042         cred = ap->a_cred;
 4043         if (cred == NULL)
 4044                 cred = td->td_ucred;
 4045 
 4046         /* Loop around doing List Extended Attribute RPCs. */
 4047         eof = false;
 4048         cookie = 0;
 4049         len2 = 0;
 4050         error = 0;
 4051         while (!eof && error == 0) {
 4052                 len = nmp->nm_rsize;
 4053                 attrflag = 0;
 4054                 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof,
 4055                     &nfsva, &attrflag, cred, td);
 4056                 if (attrflag != 0) {
 4057                         ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 4058                             1);
 4059                         if (error == 0 && ret != 0)
 4060                                 error = ret;
 4061                 }
 4062                 if (error == 0) {
 4063                         len2 += len;
 4064                         if (len2 > SSIZE_MAX)
 4065                                 error = ENOATTR;
 4066                 }
 4067         }
 4068         if (error == 0 && ap->a_size != NULL)
 4069                 *ap->a_size = len2;
 4070 
 4071         switch (error) {
 4072         case NFSERR_NOTSUPP:
 4073         case NFSERR_OPILLEGAL:
 4074                 mtx_lock(&nmp->nm_mtx);
 4075                 nmp->nm_privflag |= NFSMNTP_NOXATTR;
 4076                 mtx_unlock(&nmp->nm_mtx);
 4077                 error = EOPNOTSUPP;
 4078                 break;
 4079         case NFSERR_NOXATTR:
 4080         case NFSERR_XATTR2BIG:
 4081                 error = ENOATTR;
 4082                 break;
 4083         default:
 4084                 error = nfscl_maperr(td, error, 0, 0);
 4085                 break;
 4086         }
 4087         return (error);
 4088 }
 4089 
 4090 /*
 4091  * nfs setextattr call
 4092  */
 4093 static int
 4094 nfs_deleteextattr(struct vop_deleteextattr_args *ap)
 4095 {
 4096         struct vnode *vp = ap->a_vp;
 4097         struct nfsmount *nmp;
 4098         struct nfsvattr nfsva;
 4099         int attrflag, error, ret;
 4100 
 4101         nmp = VFSTONFS(vp->v_mount);
 4102         mtx_lock(&nmp->nm_mtx);
 4103         if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
 4104             (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
 4105             ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
 4106                 mtx_unlock(&nmp->nm_mtx);
 4107                 return (EOPNOTSUPP);
 4108         }
 4109         mtx_unlock(&nmp->nm_mtx);
 4110 
 4111         /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
 4112         attrflag = 0;
 4113         error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred,
 4114             ap->a_td);
 4115         if (attrflag != 0) {
 4116                 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 4117                 if (error == 0 && ret != 0)
 4118                         error = ret;
 4119         }
 4120 
 4121         switch (error) {
 4122         case NFSERR_NOTSUPP:
 4123         case NFSERR_OPILLEGAL:
 4124                 mtx_lock(&nmp->nm_mtx);
 4125                 nmp->nm_privflag |= NFSMNTP_NOXATTR;
 4126                 mtx_unlock(&nmp->nm_mtx);
 4127                 error = EOPNOTSUPP;
 4128                 break;
 4129         case NFSERR_NOXATTR:
 4130         case NFSERR_XATTR2BIG:
 4131                 error = ENOATTR;
 4132                 break;
 4133         default:
 4134                 error = nfscl_maperr(ap->a_td, error, 0, 0);
 4135                 break;
 4136         }
 4137         return (error);
 4138 }
 4139 
 4140 /*
 4141  * Return POSIX pathconf information applicable to nfs filesystems.
 4142  */
 4143 static int
 4144 nfs_pathconf(struct vop_pathconf_args *ap)
 4145 {
 4146         struct nfsv3_pathconf pc;
 4147         struct nfsvattr nfsva;
 4148         struct vnode *vp = ap->a_vp;
 4149         struct nfsmount *nmp;
 4150         struct thread *td = curthread;
 4151         off_t off;
 4152         bool eof;
 4153         int attrflag, error;
 4154 
 4155         if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
 4156             ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
 4157             ap->a_name == _PC_NO_TRUNC)) ||
 4158             (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) {
 4159                 /*
 4160                  * Since only the above 4 a_names are returned by the NFSv3
 4161                  * Pathconf RPC, there is no point in doing it for others.
 4162                  * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
 4163                  * be used for _PC_NFS4_ACL as well.
 4164                  */
 4165                 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
 4166                     &attrflag, NULL);
 4167                 if (attrflag != 0)
 4168                         (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
 4169                             1);
 4170                 if (error != 0)
 4171                         return (error);
 4172         } else {
 4173                 /*
 4174                  * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
 4175                  * just fake them.
 4176                  */
 4177                 pc.pc_linkmax = NFS_LINK_MAX;
 4178                 pc.pc_namemax = NFS_MAXNAMLEN;
 4179                 pc.pc_notrunc = 1;
 4180                 pc.pc_chownrestricted = 1;
 4181                 pc.pc_caseinsensitive = 0;
 4182                 pc.pc_casepreserving = 1;
 4183                 error = 0;
 4184         }
 4185         switch (ap->a_name) {
 4186         case _PC_LINK_MAX:
 4187 #ifdef _LP64
 4188                 *ap->a_retval = pc.pc_linkmax;
 4189 #else
 4190                 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax);
 4191 #endif
 4192                 break;
 4193         case _PC_NAME_MAX:
 4194                 *ap->a_retval = pc.pc_namemax;
 4195                 break;
 4196         case _PC_PIPE_BUF:
 4197                 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
 4198                         *ap->a_retval = PIPE_BUF;
 4199                 else
 4200                         error = EINVAL;
 4201                 break;
 4202         case _PC_CHOWN_RESTRICTED:
 4203                 *ap->a_retval = pc.pc_chownrestricted;
 4204                 break;
 4205         case _PC_NO_TRUNC:
 4206                 *ap->a_retval = pc.pc_notrunc;
 4207                 break;
 4208         case _PC_ACL_NFS4:
 4209                 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
 4210                     NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
 4211                         *ap->a_retval = 1;
 4212                 else
 4213                         *ap->a_retval = 0;
 4214                 break;
 4215         case _PC_ACL_PATH_MAX:
 4216                 if (NFS_ISV4(vp))
 4217                         *ap->a_retval = ACL_MAX_ENTRIES;
 4218                 else
 4219                         *ap->a_retval = 3;
 4220                 break;
 4221         case _PC_PRIO_IO:
 4222                 *ap->a_retval = 0;
 4223                 break;
 4224         case _PC_SYNC_IO:
 4225                 *ap->a_retval = 0;
 4226                 break;
 4227         case _PC_ALLOC_SIZE_MIN:
 4228                 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
 4229                 break;
 4230         case _PC_FILESIZEBITS:
 4231                 if (NFS_ISV34(vp))
 4232                         *ap->a_retval = 64;
 4233                 else
 4234                         *ap->a_retval = 32;
 4235                 break;
 4236         case _PC_REC_INCR_XFER_SIZE:
 4237                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 4238                 break;
 4239         case _PC_REC_MAX_XFER_SIZE:
 4240                 *ap->a_retval = -1; /* means ``unlimited'' */
 4241                 break;
 4242         case _PC_REC_MIN_XFER_SIZE:
 4243                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 4244                 break;
 4245         case _PC_REC_XFER_ALIGN:
 4246                 *ap->a_retval = PAGE_SIZE;
 4247                 break;
 4248         case _PC_SYMLINK_MAX:
 4249                 *ap->a_retval = NFS_MAXPATHLEN;
 4250                 break;
 4251         case _PC_MIN_HOLE_SIZE:
 4252                 /* Only some NFSv4.2 servers support Seek for Holes. */
 4253                 *ap->a_retval = 0;
 4254                 nmp = VFSTONFS(vp->v_mount);
 4255                 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) {
 4256                         /*
 4257                          * NFSv4.2 doesn't have an attribute for hole size,
 4258                          * so all we can do is see if the Seek operation is
 4259                          * supported and then use f_iosize as a "best guess".
 4260                          */
 4261                         mtx_lock(&nmp->nm_mtx);
 4262                         if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) {
 4263                                 mtx_unlock(&nmp->nm_mtx);
 4264                                 off = 0;
 4265                                 attrflag = 0;
 4266                                 error = nfsrpc_seek(vp, &off, &eof,
 4267                                     NFSV4CONTENT_HOLE, td->td_ucred, &nfsva,
 4268                                     &attrflag);
 4269                                 if (attrflag != 0)
 4270                                         nfscl_loadattrcache(&vp, &nfsva,
 4271                                             NULL, NULL, 0, 1);
 4272                                 mtx_lock(&nmp->nm_mtx);
 4273                                 if (error == NFSERR_NOTSUPP)
 4274                                         nmp->nm_privflag |= NFSMNTP_SEEKTESTED;
 4275                                 else
 4276                                         nmp->nm_privflag |= NFSMNTP_SEEKTESTED |
 4277                                             NFSMNTP_SEEK;
 4278                                 error = 0;
 4279                         }
 4280                         if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0)
 4281                                 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
 4282                         mtx_unlock(&nmp->nm_mtx);
 4283                 }
 4284                 break;
 4285 
 4286         default:
 4287                 error = vop_stdpathconf(ap);
 4288                 break;
 4289         }
 4290         return (error);
 4291 }

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