The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/nfsclient/nfs_vnops.c

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 /*
   39  * vnode op calls for Sun NFS version 2 and 3
   40  */
   41 
   42 #include "opt_inet.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/kernel.h>
   46 #include <sys/systm.h>
   47 #include <sys/resourcevar.h>
   48 #include <sys/proc.h>
   49 #include <sys/mount.h>
   50 #include <sys/bio.h>
   51 #include <sys/buf.h>
   52 #include <sys/malloc.h>
   53 #include <sys/mbuf.h>
   54 #include <sys/namei.h>
   55 #include <sys/socket.h>
   56 #include <sys/vnode.h>
   57 #include <sys/dirent.h>
   58 #include <sys/fcntl.h>
   59 #include <sys/lockf.h>
   60 #include <sys/stat.h>
   61 #include <sys/sysctl.h>
   62 #include <sys/signalvar.h>
   63 
   64 #include <vm/vm.h>
   65 #include <vm/vm_object.h>
   66 #include <vm/vm_extern.h>
   67 #include <vm/vm_object.h>
   68 
   69 #include <fs/fifofs/fifo.h>
   70 
   71 #include <rpc/rpcclnt.h>
   72 
   73 #include <nfs/rpcv2.h>
   74 #include <nfs/nfsproto.h>
   75 #include <nfsclient/nfs.h>
   76 #include <nfsclient/nfsnode.h>
   77 #include <nfsclient/nfsmount.h>
   78 #include <nfsclient/nfs_lock.h>
   79 #include <nfs/xdr_subs.h>
   80 #include <nfsclient/nfsm_subs.h>
   81 
   82 #include <net/if.h>
   83 #include <netinet/in.h>
   84 #include <netinet/in_var.h>
   85 
   86 /* Defs */
   87 #define TRUE    1
   88 #define FALSE   0
   89 
   90 /*
   91  * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
   92  * calls are not in getblk() and brelse() so that they would not be necessary
   93  * here.
   94  */
   95 #ifndef B_VMIO
   96 #define vfs_busy_pages(bp, f)
   97 #endif
   98 
   99 static vop_read_t       nfsfifo_read;
  100 static vop_write_t      nfsfifo_write;
  101 static vop_close_t      nfsfifo_close;
  102 static int      nfs_flush(struct vnode *, int, struct thread *,
  103                     int);
  104 static int      nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
  105                     struct thread *);
  106 static vop_lookup_t     nfs_lookup;
  107 static vop_create_t     nfs_create;
  108 static vop_mknod_t      nfs_mknod;
  109 static vop_open_t       nfs_open;
  110 static vop_close_t      nfs_close;
  111 static vop_access_t     nfs_access;
  112 static vop_getattr_t    nfs_getattr;
  113 static vop_setattr_t    nfs_setattr;
  114 static vop_read_t       nfs_read;
  115 static vop_fsync_t      nfs_fsync;
  116 static vop_remove_t     nfs_remove;
  117 static vop_link_t       nfs_link;
  118 static vop_rename_t     nfs_rename;
  119 static vop_mkdir_t      nfs_mkdir;
  120 static vop_rmdir_t      nfs_rmdir;
  121 static vop_symlink_t    nfs_symlink;
  122 static vop_readdir_t    nfs_readdir;
  123 static vop_strategy_t   nfs_strategy;
  124 static  int     nfs_lookitup(struct vnode *, const char *, int,
  125                     struct ucred *, struct thread *, struct nfsnode **);
  126 static  int     nfs_sillyrename(struct vnode *, struct vnode *,
  127                     struct componentname *);
  128 static vop_access_t     nfsspec_access;
  129 static vop_readlink_t   nfs_readlink;
  130 static vop_print_t      nfs_print;
  131 static vop_advlock_t    nfs_advlock;
  132 
  133 /*
  134  * Global vfs data structures for nfs
  135  */
  136 struct vop_vector nfs_vnodeops = {
  137         .vop_default =          &default_vnodeops,
  138         .vop_access =           nfs_access,
  139         .vop_advlock =          nfs_advlock,
  140         .vop_close =            nfs_close,
  141         .vop_create =           nfs_create,
  142         .vop_fsync =            nfs_fsync,
  143         .vop_getattr =          nfs_getattr,
  144         .vop_getpages =         nfs_getpages,
  145         .vop_putpages =         nfs_putpages,
  146         .vop_inactive =         nfs_inactive,
  147         .vop_lease =            VOP_NULL,
  148         .vop_link =             nfs_link,
  149         .vop_lookup =           nfs_lookup,
  150         .vop_mkdir =            nfs_mkdir,
  151         .vop_mknod =            nfs_mknod,
  152         .vop_open =             nfs_open,
  153         .vop_print =            nfs_print,
  154         .vop_read =             nfs_read,
  155         .vop_readdir =          nfs_readdir,
  156         .vop_readlink =         nfs_readlink,
  157         .vop_reclaim =          nfs_reclaim,
  158         .vop_remove =           nfs_remove,
  159         .vop_rename =           nfs_rename,
  160         .vop_rmdir =            nfs_rmdir,
  161         .vop_setattr =          nfs_setattr,
  162         .vop_strategy =         nfs_strategy,
  163         .vop_symlink =          nfs_symlink,
  164         .vop_write =            nfs_write,
  165 };
  166 
  167 struct vop_vector nfs_fifoops = {
  168         .vop_default =          &fifo_specops,
  169         .vop_access =           nfsspec_access,
  170         .vop_close =            nfsfifo_close,
  171         .vop_fsync =            nfs_fsync,
  172         .vop_getattr =          nfs_getattr,
  173         .vop_inactive =         nfs_inactive,
  174         .vop_print =            nfs_print,
  175         .vop_read =             nfsfifo_read,
  176         .vop_reclaim =          nfs_reclaim,
  177         .vop_setattr =          nfs_setattr,
  178         .vop_write =            nfsfifo_write,
  179 };
  180 
  181 static int      nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
  182                              struct componentname *cnp, struct vattr *vap);
  183 static int      nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
  184                               struct ucred *cred, struct thread *td);
  185 static int      nfs_renamerpc(struct vnode *fdvp, const char *fnameptr,
  186                               int fnamelen, struct vnode *tdvp,
  187                               const char *tnameptr, int tnamelen,
  188                               struct ucred *cred, struct thread *td);
  189 static int      nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
  190                              struct sillyrename *sp);
  191 
  192 /*
  193  * Global variables
  194  */
  195 struct mtx      nfs_iod_mtx;
  196 struct proc     *nfs_iodwant[NFS_MAXASYNCDAEMON];
  197 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
  198 int              nfs_numasync = 0;
  199 #define DIRHDSIZ        (sizeof (struct dirent) - (MAXNAMLEN + 1))
  200 
  201 SYSCTL_DECL(_vfs_nfs);
  202 
  203 static int      nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
  204 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
  205            &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
  206 
  207 static int      nfsv3_commit_on_close = 0;
  208 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW,
  209            &nfsv3_commit_on_close, 0, "write+commit on close, else only write");
  210 
  211 static int      nfs_clean_pages_on_close = 1;
  212 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
  213            &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
  214 
  215 int nfs_directio_enable = 0;
  216 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
  217            &nfs_directio_enable, 0, "Enable NFS directio");
  218 
  219 /*
  220  * This sysctl allows other processes to mmap a file that has been opened
  221  * O_DIRECT by a process.  In general, having processes mmap the file while
  222  * Direct IO is in progress can lead to Data Inconsistencies.  But, we allow
  223  * this by default to prevent DoS attacks - to prevent a malicious user from
  224  * opening up files O_DIRECT preventing other users from mmap'ing these
  225  * files.  "Protected" environments where stricter consistency guarantees are
  226  * required can disable this knob.  The process that opened the file O_DIRECT
  227  * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
  228  * meaningful.
  229  */
  230 int nfs_directio_allow_mmap = 1;
  231 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
  232            &nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
  233 
  234 #if 0
  235 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
  236            &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
  237 
  238 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
  239            &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
  240 #endif
  241 
  242 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY          \
  243                          | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE     \
  244                          | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP)
  245 
  246 /*
  247  * SMP Locking Note :
  248  * The list of locks after the description of the lock is the ordering
  249  * of other locks acquired with the lock held.
  250  * np->n_mtx : Protects the fields in the nfsnode.
  251        VM Object Lock
  252        VI_MTX (acquired indirectly)
  253  * nmp->nm_mtx : Protects the fields in the nfsmount.
  254        rep->r_mtx
  255  * nfs_iod_mtx : Global lock, protects shared nfsiod state.
  256  * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
  257        nmp->nm_mtx
  258        rep->r_mtx
  259  * rep->r_mtx : Protects the fields in an nfsreq.
  260  */
  261 
  262 static int
  263 nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td,
  264     struct ucred *cred)
  265 {
  266         const int v3 = 1;
  267         u_int32_t *tl;
  268         int error = 0, attrflag;
  269 
  270         struct mbuf *mreq, *mrep, *md, *mb;
  271         caddr_t bpos, dpos;
  272         u_int32_t rmode;
  273         struct nfsnode *np = VTONFS(vp);
  274 
  275         nfsstats.rpccnt[NFSPROC_ACCESS]++;
  276         mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED);
  277         mb = mreq;
  278         bpos = mtod(mb, caddr_t);
  279         nfsm_fhtom(vp, v3);
  280         tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
  281         *tl = txdr_unsigned(wmode);
  282         nfsm_request(vp, NFSPROC_ACCESS, td, cred);
  283         nfsm_postop_attr(vp, attrflag);
  284         if (!error) {
  285                 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
  286                 rmode = fxdr_unsigned(u_int32_t, *tl);
  287                 mtx_lock(&np->n_mtx);
  288                 np->n_mode = rmode;
  289                 np->n_modeuid = cred->cr_uid;
  290                 np->n_modestamp = time_second;
  291                 mtx_unlock(&np->n_mtx);
  292         }
  293         m_freem(mrep);
  294 nfsmout:
  295         return (error);
  296 }
  297 
  298 /*
  299  * nfs access vnode op.
  300  * For nfs version 2, just return ok. File accesses may fail later.
  301  * For nfs version 3, use the access rpc to check accessibility. If file modes
  302  * are changed on the server, accesses might still fail later.
  303  */
  304 static int
  305 nfs_access(struct vop_access_args *ap)
  306 {
  307         struct vnode *vp = ap->a_vp;
  308         int error = 0;
  309         u_int32_t mode, wmode;
  310         int v3 = NFS_ISV3(vp);
  311         struct nfsnode *np = VTONFS(vp);
  312 
  313         /*
  314          * Disallow write attempts on filesystems mounted read-only;
  315          * unless the file is a socket, fifo, or a block or character
  316          * device resident on the filesystem.
  317          */
  318         if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
  319                 switch (vp->v_type) {
  320                 case VREG:
  321                 case VDIR:
  322                 case VLNK:
  323                         return (EROFS);
  324                 default:
  325                         break;
  326                 }
  327         }
  328         /*
  329          * For nfs v3, check to see if we have done this recently, and if
  330          * so return our cached result instead of making an ACCESS call.
  331          * If not, do an access rpc, otherwise you are stuck emulating
  332          * ufs_access() locally using the vattr. This may not be correct,
  333          * since the server may apply other access criteria such as
  334          * client uid-->server uid mapping that we do not know about.
  335          */
  336         if (v3) {
  337                 if (ap->a_mode & VREAD)
  338                         mode = NFSV3ACCESS_READ;
  339                 else
  340                         mode = 0;
  341                 if (vp->v_type != VDIR) {
  342                         if (ap->a_mode & VWRITE)
  343                                 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
  344                         if (ap->a_mode & VEXEC)
  345                                 mode |= NFSV3ACCESS_EXECUTE;
  346                 } else {
  347                         if (ap->a_mode & VWRITE)
  348                                 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
  349                                          NFSV3ACCESS_DELETE);
  350                         if (ap->a_mode & VEXEC)
  351                                 mode |= NFSV3ACCESS_LOOKUP;
  352                 }
  353                 /* XXX safety belt, only make blanket request if caching */
  354                 if (nfsaccess_cache_timeout > 0) {
  355                         wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY |
  356                                 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE |
  357                                 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP;
  358                 } else {
  359                         wmode = mode;
  360                 }
  361 
  362                 /*
  363                  * Does our cached result allow us to give a definite yes to
  364                  * this request?
  365                  */
  366                 mtx_lock(&np->n_mtx);
  367                 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) &&
  368                     (ap->a_cred->cr_uid == np->n_modeuid) &&
  369                     ((np->n_mode & mode) == mode)) {
  370                         nfsstats.accesscache_hits++;
  371                 } else {
  372                         /*
  373                          * Either a no, or a don't know.  Go to the wire.
  374                          */
  375                         nfsstats.accesscache_misses++;
  376                         mtx_unlock(&np->n_mtx);
  377                         error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred);
  378                         mtx_lock(&np->n_mtx);
  379                         if (!error) {
  380                                 if ((np->n_mode & mode) != mode) {
  381                                         error = EACCES;
  382                                 }
  383                         }
  384                 }
  385                 mtx_unlock(&np->n_mtx);
  386                 return (error);
  387         } else {
  388                 if ((error = nfsspec_access(ap)) != 0) {
  389                         return (error);
  390                 }
  391                 /*
  392                  * Attempt to prevent a mapped root from accessing a file
  393                  * which it shouldn't.  We try to read a byte from the file
  394                  * if the user is root and the file is not zero length.
  395                  * After calling nfsspec_access, we should have the correct
  396                  * file size cached.
  397                  */
  398                 mtx_lock(&np->n_mtx);
  399                 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD)
  400                     && VTONFS(vp)->n_size > 0) {
  401                         struct iovec aiov;
  402                         struct uio auio;
  403                         char buf[1];
  404 
  405                         mtx_unlock(&np->n_mtx);
  406                         aiov.iov_base = buf;
  407                         aiov.iov_len = 1;
  408                         auio.uio_iov = &aiov;
  409                         auio.uio_iovcnt = 1;
  410                         auio.uio_offset = 0;
  411                         auio.uio_resid = 1;
  412                         auio.uio_segflg = UIO_SYSSPACE;
  413                         auio.uio_rw = UIO_READ;
  414                         auio.uio_td = ap->a_td;
  415 
  416                         if (vp->v_type == VREG)
  417                                 error = nfs_readrpc(vp, &auio, ap->a_cred);
  418                         else if (vp->v_type == VDIR) {
  419                                 char* bp;
  420                                 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
  421                                 aiov.iov_base = bp;
  422                                 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
  423                                 error = nfs_readdirrpc(vp, &auio, ap->a_cred);
  424                                 free(bp, M_TEMP);
  425                         } else if (vp->v_type == VLNK)
  426                                 error = nfs_readlinkrpc(vp, &auio, ap->a_cred);
  427                         else
  428                                 error = EACCES;
  429                 } else
  430                         mtx_unlock(&np->n_mtx);
  431                 return (error);
  432         }
  433 }
  434 
  435 int nfs_otw_getattr_avoid = 0;
  436 
  437 /*
  438  * nfs open vnode op
  439  * Check to see if the type is ok
  440  * and that deletion is not in progress.
  441  * For paged in text files, you will need to flush the page cache
  442  * if consistency is lost.
  443  */
  444 /* ARGSUSED */
  445 static int
  446 nfs_open(struct vop_open_args *ap)
  447 {
  448         struct vnode *vp = ap->a_vp;
  449         struct nfsnode *np = VTONFS(vp);
  450         struct vattr vattr;
  451         int error;
  452         int fmode = ap->a_mode;
  453 
  454         if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
  455                 return (EOPNOTSUPP);
  456 
  457         /*
  458          * Get a valid lease. If cached data is stale, flush it.
  459          */
  460         mtx_lock(&np->n_mtx);
  461         if (np->n_flag & NMODIFIED) {
  462                 mtx_unlock(&np->n_mtx);                 
  463                 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  464                 if (error == EINTR || error == EIO)
  465                         return (error);
  466                 np->n_attrstamp = 0;
  467                 if (vp->v_type == VDIR)
  468                         np->n_direofoffset = 0;
  469                 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td);
  470                 if (error)
  471                         return (error);
  472                 mtx_lock(&np->n_mtx);
  473                 np->n_mtime = vattr.va_mtime;
  474                 mtx_unlock(&np->n_mtx);
  475         } else {
  476                 struct thread *td = curthread;
  477 
  478                 if (np->n_ac_ts_syscalls != td->td_syscalls ||
  479                     np->n_ac_ts_tid != td->td_tid || 
  480                     td->td_proc == NULL ||
  481                     np->n_ac_ts_pid != td->td_proc->p_pid) {
  482                         np->n_attrstamp = 0;
  483                 }
  484                 mtx_unlock(&np->n_mtx);                                         
  485                 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td);
  486                 if (error)
  487                         return (error);
  488                 mtx_lock(&np->n_mtx);
  489                 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
  490                         if (vp->v_type == VDIR)
  491                                 np->n_direofoffset = 0;
  492                         mtx_unlock(&np->n_mtx);
  493                         error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  494                         if (error == EINTR || error == EIO) {
  495                                 return (error);
  496                         }
  497                         mtx_lock(&np->n_mtx);
  498                         np->n_mtime = vattr.va_mtime;
  499                 }
  500                 mtx_unlock(&np->n_mtx);
  501         }
  502         /*
  503          * If the object has >= 1 O_DIRECT active opens, we disable caching.
  504          */
  505         if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  506                 if (np->n_directio_opens == 0) {
  507                         error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  508                         if (error)
  509                                 return (error);
  510                         mtx_lock(&np->n_mtx);
  511                         np->n_flag |= NNONCACHE;
  512                         mtx_unlock(&np->n_mtx);
  513                 }
  514                 np->n_directio_opens++;
  515         }
  516         vnode_create_vobject(vp, vattr.va_size, ap->a_td);
  517         return (0);
  518 }
  519 
  520 /*
  521  * nfs close vnode op
  522  * What an NFS client should do upon close after writing is a debatable issue.
  523  * Most NFS clients push delayed writes to the server upon close, basically for
  524  * two reasons:
  525  * 1 - So that any write errors may be reported back to the client process
  526  *     doing the close system call. By far the two most likely errors are
  527  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
  528  * 2 - To put a worst case upper bound on cache inconsistency between
  529  *     multiple clients for the file.
  530  * There is also a consistency problem for Version 2 of the protocol w.r.t.
  531  * not being able to tell if other clients are writing a file concurrently,
  532  * since there is no way of knowing if the changed modify time in the reply
  533  * is only due to the write for this client.
  534  * (NFS Version 3 provides weak cache consistency data in the reply that
  535  *  should be sufficient to detect and handle this case.)
  536  *
  537  * The current code does the following:
  538  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
  539  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
  540  *                     or commit them (this satisfies 1 and 2 except for the
  541  *                     case where the server crashes after this close but
  542  *                     before the commit RPC, which is felt to be "good
  543  *                     enough". Changing the last argument to nfs_flush() to
  544  *                     a 1 would force a commit operation, if it is felt a
  545  *                     commit is necessary now.
  546  */
  547 /* ARGSUSED */
  548 static int
  549 nfs_close(struct vop_close_args *ap)
  550 {
  551         struct vnode *vp = ap->a_vp;
  552         struct nfsnode *np = VTONFS(vp);
  553         int error = 0;
  554         int fmode = ap->a_fflag;
  555 
  556         if (vp->v_type == VREG) {
  557             /*
  558              * Examine and clean dirty pages, regardless of NMODIFIED.
  559              * This closes a major hole in close-to-open consistency.
  560              * We want to push out all dirty pages (and buffers) on
  561              * close, regardless of whether they were dirtied by
  562              * mmap'ed writes or via write().
  563              */
  564             if (nfs_clean_pages_on_close && vp->v_object) {
  565                 VM_OBJECT_LOCK(vp->v_object);
  566                 vm_object_page_clean(vp->v_object, 0, 0, 0);
  567                 VM_OBJECT_UNLOCK(vp->v_object);
  568             }
  569             mtx_lock(&np->n_mtx);
  570             if (np->n_flag & NMODIFIED) {
  571                 mtx_unlock(&np->n_mtx);
  572                 if (NFS_ISV3(vp)) {
  573                     /*
  574                      * Under NFSv3 we have dirty buffers to dispose of.  We
  575                      * must flush them to the NFS server.  We have the option
  576                      * of waiting all the way through the commit rpc or just
  577                      * waiting for the initial write.  The default is to only
  578                      * wait through the initial write so the data is in the
  579                      * server's cache, which is roughly similar to the state
  580                      * a standard disk subsystem leaves the file in on close().
  581                      *
  582                      * We cannot clear the NMODIFIED bit in np->n_flag due to
  583                      * potential races with other processes, and certainly
  584                      * cannot clear it if we don't commit.
  585                      */
  586                     int cm = nfsv3_commit_on_close ? 1 : 0;
  587                     error = nfs_flush(vp, MNT_WAIT, ap->a_td, cm);
  588                     /* np->n_flag &= ~NMODIFIED; */
  589                 } else
  590                     error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  591                 mtx_lock(&np->n_mtx);
  592             }
  593             /* 
  594              * Invalidate the attribute cache in all cases.
  595              * An open is going to fetch fresh attrs any way, other procs
  596              * on this node that have file open will be forced to do an 
  597              * otw attr fetch, but this is safe.
  598              */
  599             np->n_attrstamp = 0;
  600             if (np->n_flag & NWRITEERR) {
  601                 np->n_flag &= ~NWRITEERR;
  602                 error = np->n_error;
  603             }
  604             mtx_unlock(&np->n_mtx);
  605         }
  606         if (nfs_directio_enable)
  607                 KASSERT((np->n_directio_asyncwr == 0),
  608                         ("nfs_close: dirty unflushed (%d) directio buffers\n",
  609                          np->n_directio_asyncwr));
  610         if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  611                 mtx_lock(&np->n_mtx);
  612                 KASSERT((np->n_directio_opens > 0), 
  613                         ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
  614                 np->n_directio_opens--;
  615                 if (np->n_directio_opens == 0)
  616                         np->n_flag &= ~NNONCACHE;
  617                 mtx_unlock(&np->n_mtx);
  618         }
  619         return (error);
  620 }
  621 
  622 /*
  623  * nfs getattr call from vfs.
  624  */
  625 static int
  626 nfs_getattr(struct vop_getattr_args *ap)
  627 {
  628         struct vnode *vp = ap->a_vp;
  629         struct nfsnode *np = VTONFS(vp);
  630         caddr_t bpos, dpos;
  631         int error = 0;
  632         struct mbuf *mreq, *mrep, *md, *mb;
  633         int v3 = NFS_ISV3(vp);
  634 
  635         /*
  636          * Update local times for special files.
  637          */
  638         mtx_lock(&np->n_mtx);
  639         if (np->n_flag & (NACC | NUPD))
  640                 np->n_flag |= NCHG;
  641         mtx_unlock(&np->n_mtx);
  642         /*
  643          * First look in the cache.
  644          */
  645         if (nfs_getattrcache(vp, ap->a_vap) == 0)
  646                 goto nfsmout;
  647         if (v3 && nfsaccess_cache_timeout > 0) {
  648                 nfsstats.accesscache_misses++;
  649                 nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_td, ap->a_cred);
  650                 if (nfs_getattrcache(vp, ap->a_vap) == 0)
  651                         goto nfsmout;
  652         }
  653         nfsstats.rpccnt[NFSPROC_GETATTR]++;
  654         mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3));
  655         mb = mreq;
  656         bpos = mtod(mb, caddr_t);
  657         nfsm_fhtom(vp, v3);
  658         nfsm_request(vp, NFSPROC_GETATTR, ap->a_td, ap->a_cred);
  659         if (!error) {
  660                 nfsm_loadattr(vp, ap->a_vap);
  661         }
  662         m_freem(mrep);
  663 nfsmout:
  664         return (error);
  665 }
  666 
  667 /*
  668  * nfs setattr call.
  669  */
  670 static int
  671 nfs_setattr(struct vop_setattr_args *ap)
  672 {
  673         struct vnode *vp = ap->a_vp;
  674         struct nfsnode *np = VTONFS(vp);
  675         struct vattr *vap = ap->a_vap;
  676         int error = 0;
  677         u_quad_t tsize;
  678 
  679 #ifndef nolint
  680         tsize = (u_quad_t)0;
  681 #endif
  682 
  683         /*
  684          * Setting of flags and marking of atimes are not supported.
  685          */
  686         if (vap->va_flags != VNOVAL || (vap->va_vaflags & VA_MARK_ATIME))
  687                 return (EOPNOTSUPP);
  688 
  689         /*
  690          * Disallow write attempts if the filesystem is mounted read-only.
  691          */
  692         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  693             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  694             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  695             (vp->v_mount->mnt_flag & MNT_RDONLY)) {
  696                 error = EROFS;
  697                 goto out;
  698         }
  699         if (vap->va_size != VNOVAL) {
  700                 switch (vp->v_type) {
  701                 case VDIR:
  702                         return (EISDIR);
  703                 case VCHR:
  704                 case VBLK:
  705                 case VSOCK:
  706                 case VFIFO:
  707                         if (vap->va_mtime.tv_sec == VNOVAL &&
  708                             vap->va_atime.tv_sec == VNOVAL &&
  709                             vap->va_mode == (mode_t)VNOVAL &&
  710                             vap->va_uid == (uid_t)VNOVAL &&
  711                             vap->va_gid == (gid_t)VNOVAL)
  712                                 return (0);             
  713                         vap->va_size = VNOVAL;
  714                         break;
  715                 default:
  716                         /*
  717                          * Disallow write attempts if the filesystem is
  718                          * mounted read-only.
  719                          */
  720                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  721                                 return (EROFS);
  722                         /*
  723                          *  We run vnode_pager_setsize() early (why?),
  724                          * we must set np->n_size now to avoid vinvalbuf
  725                          * V_SAVE races that might setsize a lower
  726                          * value.
  727                          */
  728                         mtx_lock(&np->n_mtx);
  729                         tsize = np->n_size;
  730                         mtx_unlock(&np->n_mtx);
  731                         error = nfs_meta_setsize(vp, ap->a_cred, 
  732                                                  ap->a_td, vap->va_size);
  733                         mtx_lock(&np->n_mtx);
  734                         if (np->n_flag & NMODIFIED) {
  735                             tsize = np->n_size;
  736                             mtx_unlock(&np->n_mtx);
  737                             if (vap->va_size == 0)
  738                                 error = nfs_vinvalbuf(vp, 0, ap->a_td, 1);
  739                             else
  740                                 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  741                             if (error) {
  742                                 vnode_pager_setsize(vp, tsize);
  743                                 goto out;
  744                             }
  745                         } else
  746                             mtx_unlock(&np->n_mtx);
  747                         /*
  748                          * np->n_size has already been set to vap->va_size
  749                          * in nfs_meta_setsize(). We must set it again since
  750                          * nfs_loadattrcache() could be called through
  751                          * nfs_meta_setsize() and could modify np->n_size.
  752                          */
  753                         mtx_lock(&np->n_mtx);
  754                         np->n_vattr.va_size = np->n_size = vap->va_size;
  755                         mtx_unlock(&np->n_mtx);
  756                 };
  757         } else {
  758                 mtx_lock(&np->n_mtx);
  759                 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 
  760                     (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
  761                         mtx_unlock(&np->n_mtx);
  762                         if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) != 0 &&
  763                             (error == EINTR || error == EIO))
  764                                 return error;
  765                 } else
  766                         mtx_unlock(&np->n_mtx);
  767         }
  768         error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td);
  769         if (error && vap->va_size != VNOVAL) {
  770                 mtx_lock(&np->n_mtx);
  771                 np->n_size = np->n_vattr.va_size = tsize;
  772                 vnode_pager_setsize(vp, tsize);
  773                 mtx_unlock(&np->n_mtx);
  774         }
  775 out:
  776         return (error);
  777 }
  778 
  779 /*
  780  * Do an nfs setattr rpc.
  781  */
  782 static int
  783 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
  784     struct thread *td)
  785 {
  786         struct nfsv2_sattr *sp;
  787         struct nfsnode *np = VTONFS(vp);
  788         caddr_t bpos, dpos;
  789         u_int32_t *tl;
  790         int error = 0, wccflag = NFSV3_WCCRATTR;
  791         struct mbuf *mreq, *mrep, *md, *mb;
  792         int v3 = NFS_ISV3(vp);
  793 
  794         nfsstats.rpccnt[NFSPROC_SETATTR]++;
  795         mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3));
  796         mb = mreq;
  797         bpos = mtod(mb, caddr_t);
  798         nfsm_fhtom(vp, v3);
  799         if (v3) {
  800                 nfsm_v3attrbuild(vap, TRUE);
  801                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
  802                 *tl = nfs_false;
  803         } else {
  804                 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
  805                 if (vap->va_mode == (mode_t)VNOVAL)
  806                         sp->sa_mode = nfs_xdrneg1;
  807                 else
  808                         sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode);
  809                 if (vap->va_uid == (uid_t)VNOVAL)
  810                         sp->sa_uid = nfs_xdrneg1;
  811                 else
  812                         sp->sa_uid = txdr_unsigned(vap->va_uid);
  813                 if (vap->va_gid == (gid_t)VNOVAL)
  814                         sp->sa_gid = nfs_xdrneg1;
  815                 else
  816                         sp->sa_gid = txdr_unsigned(vap->va_gid);
  817                 sp->sa_size = txdr_unsigned(vap->va_size);
  818                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
  819                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
  820         }
  821         nfsm_request(vp, NFSPROC_SETATTR, td, cred);
  822         if (v3) {
  823                 np->n_modestamp = 0;
  824                 nfsm_wcc_data(vp, wccflag);
  825         } else
  826                 nfsm_loadattr(vp, NULL);
  827         m_freem(mrep);
  828 nfsmout:
  829         return (error);
  830 }
  831 
  832 /*
  833  * nfs lookup call, one step at a time...
  834  * First look in cache
  835  * If not found, unlock the directory nfsnode and do the rpc
  836  */
  837 static int
  838 nfs_lookup(struct vop_lookup_args *ap)
  839 {
  840         struct componentname *cnp = ap->a_cnp;
  841         struct vnode *dvp = ap->a_dvp;
  842         struct vnode **vpp = ap->a_vpp;
  843         int flags = cnp->cn_flags;
  844         struct vnode *newvp;
  845         struct nfsmount *nmp;
  846         caddr_t bpos, dpos;
  847         struct mbuf *mreq, *mrep, *md, *mb;
  848         long len;
  849         nfsfh_t *fhp;
  850         struct nfsnode *np;
  851         int error = 0, attrflag, fhsize;
  852         int v3 = NFS_ISV3(dvp);
  853         struct thread *td = cnp->cn_thread;
  854         
  855         *vpp = NULLVP;
  856         if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
  857             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
  858                 return (EROFS);
  859         if (dvp->v_type != VDIR)
  860                 return (ENOTDIR);
  861         nmp = VFSTONFS(dvp->v_mount);
  862         np = VTONFS(dvp);
  863         if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) {
  864                 *vpp = NULLVP;
  865                 return (error);
  866         }
  867         if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) {
  868                 struct vattr vattr;
  869 
  870                 newvp = *vpp;
  871                 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td)
  872                  && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
  873                      nfsstats.lookupcache_hits++;
  874                      if (cnp->cn_nameiop != LOOKUP &&
  875                          (flags & ISLASTCN))
  876                              cnp->cn_flags |= SAVENAME;
  877                      return (0);
  878                 }
  879                 cache_purge(newvp);
  880                 if (dvp != newvp)
  881                         vput(newvp);
  882                 else 
  883                         vrele(newvp);
  884                 *vpp = NULLVP;
  885         }
  886         error = 0;
  887         newvp = NULLVP;
  888         nfsstats.lookupcache_misses++;
  889         nfsstats.rpccnt[NFSPROC_LOOKUP]++;
  890         len = cnp->cn_namelen;
  891         mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP,
  892                 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
  893         mb = mreq;
  894         bpos = mtod(mb, caddr_t);
  895         nfsm_fhtom(dvp, v3);
  896         nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
  897         nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred);
  898         if (error) {
  899                 if (v3) {
  900                         nfsm_postop_attr(dvp, attrflag);
  901                         m_freem(mrep);
  902                 }
  903                 goto nfsmout;
  904         }
  905         nfsm_getfh(fhp, fhsize, v3);
  906 
  907         /*
  908          * Handle RENAME case...
  909          */
  910         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
  911                 if (NFS_CMPFH(np, fhp, fhsize)) {
  912                         m_freem(mrep);
  913                         return (EISDIR);
  914                 }
  915                 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, LK_EXCLUSIVE);
  916                 if (error) {
  917                         m_freem(mrep);
  918                         return (error);
  919                 }
  920                 newvp = NFSTOV(np);
  921                 if (v3) {
  922                         nfsm_postop_attr(newvp, attrflag);
  923                         nfsm_postop_attr(dvp, attrflag);
  924                 } else
  925                         nfsm_loadattr(newvp, NULL);
  926                 *vpp = newvp;
  927                 m_freem(mrep);
  928                 cnp->cn_flags |= SAVENAME;
  929                 return (0);
  930         }
  931 
  932         if (flags & ISDOTDOT) {
  933                 VOP_UNLOCK(dvp, 0, td);
  934                 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, cnp->cn_lkflags);
  935                 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
  936                 if (error)
  937                         return (error);
  938                 newvp = NFSTOV(np);
  939         } else if (NFS_CMPFH(np, fhp, fhsize)) {
  940                 VREF(dvp);
  941                 newvp = dvp;
  942         } else {
  943                 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, cnp->cn_lkflags);
  944                 if (error) {
  945                         m_freem(mrep);
  946                         return (error);
  947                 }
  948                 newvp = NFSTOV(np);
  949         }
  950         if (v3) {
  951                 nfsm_postop_attr(newvp, attrflag);
  952                 nfsm_postop_attr(dvp, attrflag);
  953         } else
  954                 nfsm_loadattr(newvp, NULL);
  955         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
  956                 cnp->cn_flags |= SAVENAME;
  957         if ((cnp->cn_flags & MAKEENTRY) &&
  958             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
  959                 np->n_ctime = np->n_vattr.va_ctime.tv_sec;
  960                 cache_enter(dvp, newvp, cnp);
  961         }
  962         *vpp = newvp;
  963         m_freem(mrep);
  964 nfsmout:
  965         if (error) {
  966                 if (newvp != NULLVP) {
  967                         vput(newvp);
  968                         *vpp = NULLVP;
  969                 }
  970                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
  971                     (flags & ISLASTCN) && error == ENOENT) {
  972                         if (dvp->v_mount->mnt_flag & MNT_RDONLY)
  973                                 error = EROFS;
  974                         else
  975                                 error = EJUSTRETURN;
  976                 }
  977                 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
  978                         cnp->cn_flags |= SAVENAME;
  979         }
  980         return (error);
  981 }
  982 
  983 /*
  984  * nfs read call.
  985  * Just call nfs_bioread() to do the work.
  986  */
  987 static int
  988 nfs_read(struct vop_read_args *ap)
  989 {
  990         struct vnode *vp = ap->a_vp;
  991 
  992         switch (vp->v_type) {
  993         case VREG:
  994                 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
  995         case VDIR:
  996                 return (EISDIR);
  997         default:
  998                 return (EOPNOTSUPP);
  999         }
 1000 }
 1001 
 1002 /*
 1003  * nfs readlink call
 1004  */
 1005 static int
 1006 nfs_readlink(struct vop_readlink_args *ap)
 1007 {
 1008         struct vnode *vp = ap->a_vp;
 1009 
 1010         if (vp->v_type != VLNK)
 1011                 return (EINVAL);
 1012         return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1013 }
 1014 
 1015 /*
 1016  * Do a readlink rpc.
 1017  * Called by nfs_doio() from below the buffer cache.
 1018  */
 1019 int
 1020 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1021 {
 1022         caddr_t bpos, dpos;
 1023         int error = 0, len, attrflag;
 1024         struct mbuf *mreq, *mrep, *md, *mb;
 1025         int v3 = NFS_ISV3(vp);
 1026 
 1027         nfsstats.rpccnt[NFSPROC_READLINK]++;
 1028         mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3));
 1029         mb = mreq;
 1030         bpos = mtod(mb, caddr_t);
 1031         nfsm_fhtom(vp, v3);
 1032         nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred);
 1033         if (v3)
 1034                 nfsm_postop_attr(vp, attrflag);
 1035         if (!error) {
 1036                 nfsm_strsiz(len, NFS_MAXPATHLEN);
 1037                 if (len == NFS_MAXPATHLEN) {
 1038                         struct nfsnode *np = VTONFS(vp);
 1039                         mtx_lock(&np->n_mtx);
 1040                         if (np->n_size && np->n_size < NFS_MAXPATHLEN)
 1041                                 len = np->n_size;
 1042                         mtx_unlock(&np->n_mtx);
 1043                 }
 1044                 nfsm_mtouio(uiop, len);
 1045         }
 1046         m_freem(mrep);
 1047 nfsmout:
 1048         return (error);
 1049 }
 1050 
 1051 /*
 1052  * nfs read rpc call
 1053  * Ditto above
 1054  */
 1055 int
 1056 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1057 {
 1058         u_int32_t *tl;
 1059         caddr_t bpos, dpos;
 1060         struct mbuf *mreq, *mrep, *md, *mb;
 1061         struct nfsmount *nmp;
 1062         int error = 0, len, retlen, tsiz, eof, attrflag;
 1063         int v3 = NFS_ISV3(vp);
 1064         int rsize;
 1065 
 1066 #ifndef nolint
 1067         eof = 0;
 1068 #endif
 1069         nmp = VFSTONFS(vp->v_mount);
 1070         tsiz = uiop->uio_resid;
 1071         mtx_lock(&nmp->nm_mtx);
 1072         if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) {
 1073                 mtx_unlock(&nmp->nm_mtx);
 1074                 return (EFBIG);
 1075         }
 1076         rsize = nmp->nm_rsize;
 1077         mtx_unlock(&nmp->nm_mtx);
 1078         while (tsiz > 0) {
 1079                 nfsstats.rpccnt[NFSPROC_READ]++;
 1080                 len = (tsiz > rsize) ? rsize : tsiz;
 1081                 mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3);
 1082                 mb = mreq;
 1083                 bpos = mtod(mb, caddr_t);
 1084                 nfsm_fhtom(vp, v3);
 1085                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3);
 1086                 if (v3) {
 1087                         txdr_hyper(uiop->uio_offset, tl);
 1088                         *(tl + 2) = txdr_unsigned(len);
 1089                 } else {
 1090                         *tl++ = txdr_unsigned(uiop->uio_offset);
 1091                         *tl++ = txdr_unsigned(len);
 1092                         *tl = 0;
 1093                 }
 1094                 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred);
 1095                 if (v3) {
 1096                         nfsm_postop_attr(vp, attrflag);
 1097                         if (error) {
 1098                                 m_freem(mrep);
 1099                                 goto nfsmout;
 1100                         }
 1101                         tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED);
 1102                         eof = fxdr_unsigned(int, *(tl + 1));
 1103                 } else {
 1104                         nfsm_loadattr(vp, NULL);
 1105                 }
 1106                 nfsm_strsiz(retlen, rsize);
 1107                 nfsm_mtouio(uiop, retlen);
 1108                 m_freem(mrep);
 1109                 tsiz -= retlen;
 1110                 if (v3) {
 1111                         if (eof || retlen == 0) {
 1112                                 tsiz = 0;
 1113                         }
 1114                 } else if (retlen < len) {
 1115                         tsiz = 0;
 1116                 }
 1117         }
 1118 nfsmout:
 1119         return (error);
 1120 }
 1121 
 1122 /*
 1123  * nfs write call
 1124  */
 1125 int
 1126 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1127              int *iomode, int *must_commit)
 1128 {
 1129         u_int32_t *tl;
 1130         int32_t backup;
 1131         caddr_t bpos, dpos;
 1132         struct mbuf *mreq, *mrep, *md, *mb;
 1133         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 1134         int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit;
 1135         int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC;
 1136         int wsize;
 1137         
 1138 #ifndef DIAGNOSTIC
 1139         if (uiop->uio_iovcnt != 1)
 1140                 panic("nfs: writerpc iovcnt > 1");
 1141 #endif
 1142         *must_commit = 0;
 1143         tsiz = uiop->uio_resid;
 1144         mtx_lock(&nmp->nm_mtx);
 1145         if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) {
 1146                 mtx_unlock(&nmp->nm_mtx);               
 1147                 return (EFBIG);
 1148         }
 1149         wsize = nmp->nm_wsize;
 1150         mtx_unlock(&nmp->nm_mtx);
 1151         while (tsiz > 0) {
 1152                 nfsstats.rpccnt[NFSPROC_WRITE]++;
 1153                 len = (tsiz > wsize) ? wsize : tsiz;
 1154                 mreq = nfsm_reqhead(vp, NFSPROC_WRITE,
 1155                         NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len));
 1156                 mb = mreq;
 1157                 bpos = mtod(mb, caddr_t);
 1158                 nfsm_fhtom(vp, v3);
 1159                 if (v3) {
 1160                         tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
 1161                         txdr_hyper(uiop->uio_offset, tl);
 1162                         tl += 2;
 1163                         *tl++ = txdr_unsigned(len);
 1164                         *tl++ = txdr_unsigned(*iomode);
 1165                         *tl = txdr_unsigned(len);
 1166                 } else {
 1167                         u_int32_t x;
 1168 
 1169                         tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED);
 1170                         /* Set both "begin" and "current" to non-garbage. */
 1171                         x = txdr_unsigned((u_int32_t)uiop->uio_offset);
 1172                         *tl++ = x;      /* "begin offset" */
 1173                         *tl++ = x;      /* "current offset" */
 1174                         x = txdr_unsigned(len);
 1175                         *tl++ = x;      /* total to this offset */
 1176                         *tl = x;        /* size of this write */
 1177                 }
 1178                 nfsm_uiotom(uiop, len);
 1179                 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred);
 1180                 if (v3) {
 1181                         wccflag = NFSV3_WCCCHK;
 1182                         nfsm_wcc_data(vp, wccflag);
 1183                         if (!error) {
 1184                                 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED
 1185                                         + NFSX_V3WRITEVERF);
 1186                                 rlen = fxdr_unsigned(int, *tl++);
 1187                                 if (rlen == 0) {
 1188                                         error = NFSERR_IO;
 1189                                         m_freem(mrep);
 1190                                         break;
 1191                                 } else if (rlen < len) {
 1192                                         backup = len - rlen;
 1193                                         uiop->uio_iov->iov_base =
 1194                                             (char *)uiop->uio_iov->iov_base -
 1195                                             backup;
 1196                                         uiop->uio_iov->iov_len += backup;
 1197                                         uiop->uio_offset -= backup;
 1198                                         uiop->uio_resid += backup;
 1199                                         len = rlen;
 1200                                 }
 1201                                 commit = fxdr_unsigned(int, *tl++);
 1202 
 1203                                 /*
 1204                                  * Return the lowest committment level
 1205                                  * obtained by any of the RPCs.
 1206                                  */
 1207                                 if (committed == NFSV3WRITE_FILESYNC)
 1208                                         committed = commit;
 1209                                 else if (committed == NFSV3WRITE_DATASYNC &&
 1210                                         commit == NFSV3WRITE_UNSTABLE)
 1211                                         committed = commit;
 1212                                 mtx_lock(&nmp->nm_mtx);
 1213                                 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){
 1214                                     bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
 1215                                         NFSX_V3WRITEVERF);
 1216                                     nmp->nm_state |= NFSSTA_HASWRITEVERF;
 1217                                 } else if (bcmp((caddr_t)tl,
 1218                                     (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) {
 1219                                     *must_commit = 1;
 1220                                     bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
 1221                                         NFSX_V3WRITEVERF);
 1222                                 }
 1223                                 mtx_unlock(&nmp->nm_mtx);
 1224                         }
 1225                 } else {
 1226                         nfsm_loadattr(vp, NULL);
 1227                 }
 1228                 if (wccflag) {
 1229                         mtx_lock(&(VTONFS(vp))->n_mtx);
 1230                         VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime;
 1231                         mtx_unlock(&(VTONFS(vp))->n_mtx);
 1232                 }
 1233                 m_freem(mrep);
 1234                 if (error)
 1235                         break;
 1236                 tsiz -= len;
 1237         }
 1238 nfsmout:
 1239         if (vp->v_mount->mnt_kern_flag & MNTK_ASYNC)
 1240                 committed = NFSV3WRITE_FILESYNC;
 1241         *iomode = committed;
 1242         if (error)
 1243                 uiop->uio_resid = tsiz;
 1244         return (error);
 1245 }
 1246 
 1247 /*
 1248  * nfs mknod rpc
 1249  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1250  * mode set to specify the file type and the size field for rdev.
 1251  */
 1252 static int
 1253 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1254     struct vattr *vap)
 1255 {
 1256         struct nfsv2_sattr *sp;
 1257         u_int32_t *tl;
 1258         struct vnode *newvp = NULL;
 1259         struct nfsnode *np = NULL;
 1260         struct vattr vattr;
 1261         caddr_t bpos, dpos;
 1262         int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
 1263         struct mbuf *mreq, *mrep, *md, *mb;
 1264         u_int32_t rdev;
 1265         int v3 = NFS_ISV3(dvp);
 1266 
 1267         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1268                 rdev = txdr_unsigned(vap->va_rdev);
 1269         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1270                 rdev = nfs_xdrneg1;
 1271         else {
 1272                 return (EOPNOTSUPP);
 1273         }
 1274         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) {
 1275                 return (error);
 1276         }
 1277         nfsstats.rpccnt[NFSPROC_MKNOD]++;
 1278         mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED +
 1279                 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
 1280         mb = mreq;
 1281         bpos = mtod(mb, caddr_t);
 1282         nfsm_fhtom(dvp, v3);
 1283         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1284         if (v3) {
 1285                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
 1286                 *tl++ = vtonfsv3_type(vap->va_type);
 1287                 nfsm_v3attrbuild(vap, FALSE);
 1288                 if (vap->va_type == VCHR || vap->va_type == VBLK) {
 1289                         tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
 1290                         *tl++ = txdr_unsigned(umajor(vap->va_rdev));
 1291                         *tl = txdr_unsigned(uminor(vap->va_rdev));
 1292                 }
 1293         } else {
 1294                 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
 1295                 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
 1296                 sp->sa_uid = nfs_xdrneg1;
 1297                 sp->sa_gid = nfs_xdrneg1;
 1298                 sp->sa_size = rdev;
 1299                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 1300                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 1301         }
 1302         nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred);
 1303         if (!error) {
 1304                 nfsm_mtofh(dvp, newvp, v3, gotvp);
 1305                 if (!gotvp) {
 1306                         if (newvp) {
 1307                                 vput(newvp);
 1308                                 newvp = NULL;
 1309                         }
 1310                         error = nfs_lookitup(dvp, cnp->cn_nameptr,
 1311                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
 1312                         if (!error)
 1313                                 newvp = NFSTOV(np);
 1314                 }
 1315         }
 1316         if (v3)
 1317                 nfsm_wcc_data(dvp, wccflag);
 1318         m_freem(mrep);
 1319 nfsmout:
 1320         if (error) {
 1321                 if (newvp)
 1322                         vput(newvp);
 1323         } else {
 1324                 if (cnp->cn_flags & MAKEENTRY)
 1325                         cache_enter(dvp, newvp, cnp);
 1326                 *vpp = newvp;
 1327         }
 1328         mtx_lock(&(VTONFS(dvp))->n_mtx);
 1329         VTONFS(dvp)->n_flag |= NMODIFIED;
 1330         if (!wccflag)
 1331                 VTONFS(dvp)->n_attrstamp = 0;
 1332         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 1333         return (error);
 1334 }
 1335 
 1336 /*
 1337  * nfs mknod vop
 1338  * just call nfs_mknodrpc() to do the work.
 1339  */
 1340 /* ARGSUSED */
 1341 static int
 1342 nfs_mknod(struct vop_mknod_args *ap)
 1343 {
 1344         return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
 1345 }
 1346 
 1347 static u_long create_verf;
 1348 /*
 1349  * nfs file create call
 1350  */
 1351 static int
 1352 nfs_create(struct vop_create_args *ap)
 1353 {
 1354         struct vnode *dvp = ap->a_dvp;
 1355         struct vattr *vap = ap->a_vap;
 1356         struct componentname *cnp = ap->a_cnp;
 1357         struct nfsv2_sattr *sp;
 1358         u_int32_t *tl;
 1359         struct nfsnode *np = NULL;
 1360         struct vnode *newvp = NULL;
 1361         caddr_t bpos, dpos;
 1362         int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;
 1363         struct mbuf *mreq, *mrep, *md, *mb;
 1364         struct vattr vattr;
 1365         int v3 = NFS_ISV3(dvp);
 1366 
 1367         /*
 1368          * Oops, not for me..
 1369          */
 1370         if (vap->va_type == VSOCK)
 1371                 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 1372 
 1373         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) {
 1374                 return (error);
 1375         }
 1376         if (vap->va_vaflags & VA_EXCLUSIVE)
 1377                 fmode |= O_EXCL;
 1378 again:
 1379         nfsstats.rpccnt[NFSPROC_CREATE]++;
 1380         mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED +
 1381                 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
 1382         mb = mreq;
 1383         bpos = mtod(mb, caddr_t);
 1384         nfsm_fhtom(dvp, v3);
 1385         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1386         if (v3) {
 1387                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
 1388                 if (fmode & O_EXCL) {
 1389                         *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
 1390                         tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF);
 1391 #ifdef INET
 1392                         if (!TAILQ_EMPTY(&in_ifaddrhead))
 1393                                 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr.s_addr;
 1394                         else
 1395 #endif
 1396                                 *tl++ = create_verf;
 1397                         *tl = ++create_verf;
 1398                 } else {
 1399                         *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED);
 1400                         nfsm_v3attrbuild(vap, FALSE);
 1401                 }
 1402         } else {
 1403                 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
 1404                 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
 1405                 sp->sa_uid = nfs_xdrneg1;
 1406                 sp->sa_gid = nfs_xdrneg1;
 1407                 sp->sa_size = 0;
 1408                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 1409                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 1410         }
 1411         nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred);
 1412         if (!error) {
 1413                 nfsm_mtofh(dvp, newvp, v3, gotvp);
 1414                 if (!gotvp) {
 1415                         if (newvp) {
 1416                                 vput(newvp);
 1417                                 newvp = NULL;
 1418                         }
 1419                         error = nfs_lookitup(dvp, cnp->cn_nameptr,
 1420                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
 1421                         if (!error)
 1422                                 newvp = NFSTOV(np);
 1423                 }
 1424         }
 1425         if (v3)
 1426                 nfsm_wcc_data(dvp, wccflag);
 1427         m_freem(mrep);
 1428 nfsmout:
 1429         if (error) {
 1430                 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) {
 1431                         fmode &= ~O_EXCL;
 1432                         goto again;
 1433                 }
 1434                 if (newvp)
 1435                         vput(newvp);
 1436         } else if (v3 && (fmode & O_EXCL)) {
 1437                 /*
 1438                  * We are normally called with only a partially initialized
 1439                  * VAP.  Since the NFSv3 spec says that server may use the
 1440                  * file attributes to store the verifier, the spec requires
 1441                  * us to do a SETATTR RPC. FreeBSD servers store the verifier
 1442                  * in atime, but we can't really assume that all servers will
 1443                  * so we ensure that our SETATTR sets both atime and mtime.
 1444                  */
 1445                 if (vap->va_mtime.tv_sec == VNOVAL)
 1446                         vfs_timestamp(&vap->va_mtime);
 1447                 if (vap->va_atime.tv_sec == VNOVAL)
 1448                         vap->va_atime = vap->va_mtime;
 1449                 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_thread);
 1450                 if (error)
 1451                         vput(newvp);
 1452         }
 1453         if (!error) {
 1454                 if (cnp->cn_flags & MAKEENTRY)
 1455                         cache_enter(dvp, newvp, cnp);
 1456                 *ap->a_vpp = newvp;
 1457         }
 1458         mtx_lock(&(VTONFS(dvp))->n_mtx);
 1459         VTONFS(dvp)->n_flag |= NMODIFIED;
 1460         if (!wccflag)
 1461                 VTONFS(dvp)->n_attrstamp = 0;
 1462         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 1463         return (error);
 1464 }
 1465 
 1466 /*
 1467  * nfs file remove call
 1468  * To try and make nfs semantics closer to ufs semantics, a file that has
 1469  * other processes using the vnode is renamed instead of removed and then
 1470  * removed later on the last close.
 1471  * - If v_usecount > 1
 1472  *        If a rename is not already in the works
 1473  *           call nfs_sillyrename() to set it up
 1474  *     else
 1475  *        do the remove rpc
 1476  */
 1477 static int
 1478 nfs_remove(struct vop_remove_args *ap)
 1479 {
 1480         struct vnode *vp = ap->a_vp;
 1481         struct vnode *dvp = ap->a_dvp;
 1482         struct componentname *cnp = ap->a_cnp;
 1483         struct nfsnode *np = VTONFS(vp);
 1484         int error = 0;
 1485         struct vattr vattr;
 1486 
 1487 #ifndef DIAGNOSTIC
 1488         if ((cnp->cn_flags & HASBUF) == 0)
 1489                 panic("nfs_remove: no name");
 1490         if (vrefcnt(vp) < 1)
 1491                 panic("nfs_remove: bad v_usecount");
 1492 #endif
 1493         if (vp->v_type == VDIR)
 1494                 error = EPERM;
 1495         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1496             VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_thread) == 0 &&
 1497             vattr.va_nlink > 1)) {
 1498                 /*
 1499                  * Purge the name cache so that the chance of a lookup for
 1500                  * the name succeeding while the remove is in progress is
 1501                  * minimized. Without node locking it can still happen, such
 1502                  * that an I/O op returns ESTALE, but since you get this if
 1503                  * another host removes the file..
 1504                  */
 1505                 cache_purge(vp);
 1506                 /*
 1507                  * throw away biocache buffers, mainly to avoid
 1508                  * unnecessary delayed writes later.
 1509                  */
 1510                 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1511                 /* Do the rpc */
 1512                 if (error != EINTR && error != EIO)
 1513                         error = nfs_removerpc(dvp, cnp->cn_nameptr,
 1514                                 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1515                 /*
 1516                  * Kludge City: If the first reply to the remove rpc is lost..
 1517                  *   the reply to the retransmitted request will be ENOENT
 1518                  *   since the file was in fact removed
 1519                  *   Therefore, we cheat and return success.
 1520                  */
 1521                 if (error == ENOENT)
 1522                         error = 0;
 1523         } else if (!np->n_sillyrename)
 1524                 error = nfs_sillyrename(dvp, vp, cnp);
 1525         np->n_attrstamp = 0;
 1526         return (error);
 1527 }
 1528 
 1529 /*
 1530  * nfs file remove rpc called from nfs_inactive
 1531  */
 1532 int
 1533 nfs_removeit(struct sillyrename *sp)
 1534 {
 1535         /*
 1536          * Make sure that the directory vnode is still valid.
 1537          * XXX we should lock sp->s_dvp here.
 1538          */
 1539         if (sp->s_dvp->v_type == VBAD)
 1540                 return (0);
 1541         return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 1542                 NULL));
 1543 }
 1544 
 1545 /*
 1546  * Nfs remove rpc, called from nfs_remove() and nfs_removeit().
 1547  */
 1548 static int
 1549 nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
 1550     struct ucred *cred, struct thread *td)
 1551 {
 1552         caddr_t bpos, dpos;
 1553         int error = 0, wccflag = NFSV3_WCCRATTR;
 1554         struct mbuf *mreq, *mrep, *md, *mb;
 1555         int v3 = NFS_ISV3(dvp);
 1556 
 1557         nfsstats.rpccnt[NFSPROC_REMOVE]++;
 1558         mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE,
 1559                 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen));
 1560         mb = mreq;
 1561         bpos = mtod(mb, caddr_t);
 1562         nfsm_fhtom(dvp, v3);
 1563         nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
 1564         nfsm_request(dvp, NFSPROC_REMOVE, td, cred);
 1565         if (v3)
 1566                 nfsm_wcc_data(dvp, wccflag);
 1567         m_freem(mrep);
 1568 nfsmout:
 1569         mtx_lock(&(VTONFS(dvp))->n_mtx);
 1570         VTONFS(dvp)->n_flag |= NMODIFIED;
 1571         if (!wccflag)
 1572                 VTONFS(dvp)->n_attrstamp = 0;
 1573         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 1574         return (error);
 1575 }
 1576 
 1577 /*
 1578  * nfs file rename call
 1579  */
 1580 static int
 1581 nfs_rename(struct vop_rename_args *ap)
 1582 {
 1583         struct vnode *fvp = ap->a_fvp;
 1584         struct vnode *tvp = ap->a_tvp;
 1585         struct vnode *fdvp = ap->a_fdvp;
 1586         struct vnode *tdvp = ap->a_tdvp;
 1587         struct componentname *tcnp = ap->a_tcnp;
 1588         struct componentname *fcnp = ap->a_fcnp;
 1589         int error;
 1590 
 1591 #ifndef DIAGNOSTIC
 1592         if ((tcnp->cn_flags & HASBUF) == 0 ||
 1593             (fcnp->cn_flags & HASBUF) == 0)
 1594                 panic("nfs_rename: no name");
 1595 #endif
 1596         /* Check for cross-device rename */
 1597         if ((fvp->v_mount != tdvp->v_mount) ||
 1598             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1599                 error = EXDEV;
 1600                 goto out;
 1601         }
 1602 
 1603         if (fvp == tvp) {
 1604                 nfs_printf("nfs_rename: fvp == tvp (can't happen)\n");
 1605                 error = 0;
 1606                 goto out;
 1607         }
 1608         if ((error = vn_lock(fvp, LK_EXCLUSIVE, fcnp->cn_thread)) != 0)
 1609                 goto out;
 1610 
 1611         /*
 1612          * We have to flush B_DELWRI data prior to renaming
 1613          * the file.  If we don't, the delayed-write buffers
 1614          * can be flushed out later after the file has gone stale
 1615          * under NFSV3.  NFSV2 does not have this problem because
 1616          * ( as far as I can tell ) it flushes dirty buffers more
 1617          * often.
 1618          * 
 1619          * Skip the rename operation if the fsync fails, this can happen
 1620          * due to the server's volume being full, when we pushed out data
 1621          * that was written back to our cache earlier. Not checking for
 1622          * this condition can result in potential (silent) data loss.
 1623          */
 1624         error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1625         VOP_UNLOCK(fvp, 0, fcnp->cn_thread);
 1626         if (!error && tvp)
 1627                 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1628         if (error)
 1629                 goto out;
 1630 
 1631         /*
 1632          * If the tvp exists and is in use, sillyrename it before doing the
 1633          * rename of the new file over it.
 1634          * XXX Can't sillyrename a directory.
 1635          */
 1636         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1637                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1638                 vput(tvp);
 1639                 tvp = NULL;
 1640         }
 1641 
 1642         error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1643                 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1644                 tcnp->cn_thread);
 1645 
 1646         if (fvp->v_type == VDIR) {
 1647                 if (tvp != NULL && tvp->v_type == VDIR)
 1648                         cache_purge(tdvp);
 1649                 cache_purge(fdvp);
 1650         }
 1651 
 1652 out:
 1653         if (tdvp == tvp)
 1654                 vrele(tdvp);
 1655         else
 1656                 vput(tdvp);
 1657         if (tvp)
 1658                 vput(tvp);
 1659         vrele(fdvp);
 1660         vrele(fvp);
 1661         /*
 1662          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1663          */
 1664         if (error == ENOENT)
 1665                 error = 0;
 1666         return (error);
 1667 }
 1668 
 1669 /*
 1670  * nfs file rename rpc called from nfs_remove() above
 1671  */
 1672 static int
 1673 nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
 1674     struct sillyrename *sp)
 1675 {
 1676 
 1677         return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp,
 1678             sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread));
 1679 }
 1680 
 1681 /*
 1682  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 1683  */
 1684 static int
 1685 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen,
 1686     struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred,
 1687     struct thread *td)
 1688 {
 1689         caddr_t bpos, dpos;
 1690         int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
 1691         struct mbuf *mreq, *mrep, *md, *mb;
 1692         int v3 = NFS_ISV3(fdvp);
 1693 
 1694         nfsstats.rpccnt[NFSPROC_RENAME]++;
 1695         mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME,
 1696                 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) +
 1697                 nfsm_rndup(tnamelen));
 1698         mb = mreq;
 1699         bpos = mtod(mb, caddr_t);
 1700         nfsm_fhtom(fdvp, v3);
 1701         nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
 1702         nfsm_fhtom(tdvp, v3);
 1703         nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
 1704         nfsm_request(fdvp, NFSPROC_RENAME, td, cred);
 1705         if (v3) {
 1706                 nfsm_wcc_data(fdvp, fwccflag);
 1707                 nfsm_wcc_data(tdvp, twccflag);
 1708         }
 1709         m_freem(mrep);
 1710 nfsmout:
 1711         mtx_lock(&(VTONFS(fdvp))->n_mtx);
 1712         VTONFS(fdvp)->n_flag |= NMODIFIED;
 1713         mtx_unlock(&(VTONFS(fdvp))->n_mtx);
 1714         mtx_lock(&(VTONFS(tdvp))->n_mtx);
 1715         VTONFS(tdvp)->n_flag |= NMODIFIED;
 1716         mtx_unlock(&(VTONFS(tdvp))->n_mtx);
 1717         if (!fwccflag)
 1718                 VTONFS(fdvp)->n_attrstamp = 0;
 1719         if (!twccflag)
 1720                 VTONFS(tdvp)->n_attrstamp = 0;
 1721         return (error);
 1722 }
 1723 
 1724 /*
 1725  * nfs hard link create call
 1726  */
 1727 static int
 1728 nfs_link(struct vop_link_args *ap)
 1729 {
 1730         struct vnode *vp = ap->a_vp;
 1731         struct vnode *tdvp = ap->a_tdvp;
 1732         struct componentname *cnp = ap->a_cnp;
 1733         caddr_t bpos, dpos;
 1734         int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
 1735         struct mbuf *mreq, *mrep, *md, *mb;
 1736         int v3;
 1737 
 1738         if (vp->v_mount != tdvp->v_mount) {
 1739                 return (EXDEV);
 1740         }
 1741 
 1742         /*
 1743          * Push all writes to the server, so that the attribute cache
 1744          * doesn't get "out of sync" with the server.
 1745          * XXX There should be a better way!
 1746          */
 1747         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 1748 
 1749         v3 = NFS_ISV3(vp);
 1750         nfsstats.rpccnt[NFSPROC_LINK]++;
 1751         mreq = nfsm_reqhead(vp, NFSPROC_LINK,
 1752                 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
 1753         mb = mreq;
 1754         bpos = mtod(mb, caddr_t);
 1755         nfsm_fhtom(vp, v3);
 1756         nfsm_fhtom(tdvp, v3);
 1757         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1758         nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred);
 1759         if (v3) {
 1760                 nfsm_postop_attr(vp, attrflag);
 1761                 nfsm_wcc_data(tdvp, wccflag);
 1762         }
 1763         m_freem(mrep);
 1764 nfsmout:
 1765         mtx_lock(&(VTONFS(tdvp))->n_mtx);
 1766         VTONFS(tdvp)->n_flag |= NMODIFIED;
 1767         mtx_unlock(&(VTONFS(tdvp))->n_mtx);
 1768         if (!attrflag)
 1769                 VTONFS(vp)->n_attrstamp = 0;
 1770         if (!wccflag)
 1771                 VTONFS(tdvp)->n_attrstamp = 0;
 1772         return (error);
 1773 }
 1774 
 1775 /*
 1776  * nfs symbolic link create call
 1777  */
 1778 static int
 1779 nfs_symlink(struct vop_symlink_args *ap)
 1780 {
 1781         struct vnode *dvp = ap->a_dvp;
 1782         struct vattr *vap = ap->a_vap;
 1783         struct componentname *cnp = ap->a_cnp;
 1784         struct nfsv2_sattr *sp;
 1785         caddr_t bpos, dpos;
 1786         int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
 1787         struct mbuf *mreq, *mrep, *md, *mb;
 1788         struct vnode *newvp = NULL;
 1789         int v3 = NFS_ISV3(dvp);
 1790 
 1791         nfsstats.rpccnt[NFSPROC_SYMLINK]++;
 1792         slen = strlen(ap->a_target);
 1793         mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED +
 1794             nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3));
 1795         mb = mreq;
 1796         bpos = mtod(mb, caddr_t);
 1797         nfsm_fhtom(dvp, v3);
 1798         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1799         if (v3) {
 1800                 nfsm_v3attrbuild(vap, FALSE);
 1801         }
 1802         nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN);
 1803         if (!v3) {
 1804                 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
 1805                 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode);
 1806                 sp->sa_uid = nfs_xdrneg1;
 1807                 sp->sa_gid = nfs_xdrneg1;
 1808                 sp->sa_size = nfs_xdrneg1;
 1809                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 1810                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 1811         }
 1812 
 1813         /*
 1814          * Issue the NFS request and get the rpc response.
 1815          *
 1816          * Only NFSv3 responses returning an error of 0 actually return
 1817          * a file handle that can be converted into newvp without having
 1818          * to do an extra lookup rpc.
 1819          */
 1820         nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred);
 1821         if (v3) {
 1822                 if (error == 0)
 1823                         nfsm_mtofh(dvp, newvp, v3, gotvp);
 1824                 nfsm_wcc_data(dvp, wccflag);
 1825         }
 1826 
 1827         /*
 1828          * out code jumps -> here, mrep is also freed.
 1829          */
 1830 
 1831         m_freem(mrep);
 1832 nfsmout:
 1833 
 1834         /*
 1835          * If we do not have an error and we could not extract the newvp from
 1836          * the response due to the request being NFSv2, we have to do a
 1837          * lookup in order to obtain a newvp to return.
 1838          */
 1839         if (error == 0 && newvp == NULL) {
 1840                 struct nfsnode *np = NULL;
 1841 
 1842                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1843                     cnp->cn_cred, cnp->cn_thread, &np);
 1844                 if (!error)
 1845                         newvp = NFSTOV(np);
 1846         }
 1847         if (error) {
 1848                 if (newvp)
 1849                         vput(newvp);
 1850         } else {
 1851                 *ap->a_vpp = newvp;
 1852         }
 1853         mtx_lock(&(VTONFS(dvp))->n_mtx);
 1854         VTONFS(dvp)->n_flag |= NMODIFIED;
 1855         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 1856         if (!wccflag)
 1857                 VTONFS(dvp)->n_attrstamp = 0;
 1858         return (error);
 1859 }
 1860 
 1861 /*
 1862  * nfs make dir call
 1863  */
 1864 static int
 1865 nfs_mkdir(struct vop_mkdir_args *ap)
 1866 {
 1867         struct vnode *dvp = ap->a_dvp;
 1868         struct vattr *vap = ap->a_vap;
 1869         struct componentname *cnp = ap->a_cnp;
 1870         struct nfsv2_sattr *sp;
 1871         int len;
 1872         struct nfsnode *np = NULL;
 1873         struct vnode *newvp = NULL;
 1874         caddr_t bpos, dpos;
 1875         int error = 0, wccflag = NFSV3_WCCRATTR;
 1876         int gotvp = 0;
 1877         struct mbuf *mreq, *mrep, *md, *mb;
 1878         struct vattr vattr;
 1879         int v3 = NFS_ISV3(dvp);
 1880 
 1881         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) {
 1882                 return (error);
 1883         }
 1884         len = cnp->cn_namelen;
 1885         nfsstats.rpccnt[NFSPROC_MKDIR]++;
 1886         mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR,
 1887           NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3));
 1888         mb = mreq;
 1889         bpos = mtod(mb, caddr_t);
 1890         nfsm_fhtom(dvp, v3);
 1891         nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
 1892         if (v3) {
 1893                 nfsm_v3attrbuild(vap, FALSE);
 1894         } else {
 1895                 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
 1896                 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode);
 1897                 sp->sa_uid = nfs_xdrneg1;
 1898                 sp->sa_gid = nfs_xdrneg1;
 1899                 sp->sa_size = nfs_xdrneg1;
 1900                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 1901                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 1902         }
 1903         nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred);
 1904         if (!error)
 1905                 nfsm_mtofh(dvp, newvp, v3, gotvp);
 1906         if (v3)
 1907                 nfsm_wcc_data(dvp, wccflag);
 1908         m_freem(mrep);
 1909 nfsmout:
 1910         mtx_lock(&(VTONFS(dvp))->n_mtx);
 1911         VTONFS(dvp)->n_flag |= NMODIFIED;
 1912         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 1913         if (!wccflag)
 1914                 VTONFS(dvp)->n_attrstamp = 0;
 1915         if (error == 0 && newvp == NULL) {
 1916                 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
 1917                         cnp->cn_thread, &np);
 1918                 if (!error) {
 1919                         newvp = NFSTOV(np);
 1920                         if (newvp->v_type != VDIR)
 1921                                 error = EEXIST;
 1922                 }
 1923         }
 1924         if (error) {
 1925                 if (newvp)
 1926                         vput(newvp);
 1927         } else
 1928                 *ap->a_vpp = newvp;
 1929         return (error);
 1930 }
 1931 
 1932 /*
 1933  * nfs remove directory call
 1934  */
 1935 static int
 1936 nfs_rmdir(struct vop_rmdir_args *ap)
 1937 {
 1938         struct vnode *vp = ap->a_vp;
 1939         struct vnode *dvp = ap->a_dvp;
 1940         struct componentname *cnp = ap->a_cnp;
 1941         caddr_t bpos, dpos;
 1942         int error = 0, wccflag = NFSV3_WCCRATTR;
 1943         struct mbuf *mreq, *mrep, *md, *mb;
 1944         int v3 = NFS_ISV3(dvp);
 1945 
 1946         if (dvp == vp)
 1947                 return (EINVAL);
 1948         nfsstats.rpccnt[NFSPROC_RMDIR]++;
 1949         mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR,
 1950                 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
 1951         mb = mreq;
 1952         bpos = mtod(mb, caddr_t);
 1953         nfsm_fhtom(dvp, v3);
 1954         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1955         nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred);
 1956         if (v3)
 1957                 nfsm_wcc_data(dvp, wccflag);
 1958         m_freem(mrep);
 1959 nfsmout:
 1960         mtx_lock(&(VTONFS(dvp))->n_mtx);
 1961         VTONFS(dvp)->n_flag |= NMODIFIED;
 1962         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 1963         if (!wccflag)
 1964                 VTONFS(dvp)->n_attrstamp = 0;
 1965         cache_purge(dvp);
 1966         cache_purge(vp);
 1967         /*
 1968          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 1969          */
 1970         if (error == ENOENT)
 1971                 error = 0;
 1972         return (error);
 1973 }
 1974 
 1975 /*
 1976  * nfs readdir call
 1977  */
 1978 static int
 1979 nfs_readdir(struct vop_readdir_args *ap)
 1980 {
 1981         struct vnode *vp = ap->a_vp;
 1982         struct nfsnode *np = VTONFS(vp);
 1983         struct uio *uio = ap->a_uio;
 1984         int tresid, error = 0;
 1985         struct vattr vattr;
 1986         
 1987         if (vp->v_type != VDIR) 
 1988                 return(EPERM);
 1989 
 1990         /*
 1991          * First, check for hit on the EOF offset cache
 1992          */
 1993         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 1994             (np->n_flag & NMODIFIED) == 0) {
 1995                 if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_td) == 0) {
 1996                         mtx_lock(&np->n_mtx);
 1997                         if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 1998                                 mtx_unlock(&np->n_mtx);
 1999                                 nfsstats.direofcache_hits++;
 2000                                 goto out;
 2001                         } else
 2002                                 mtx_unlock(&np->n_mtx);
 2003                 }
 2004         }
 2005 
 2006         /*
 2007          * Call nfs_bioread() to do the real work.
 2008          */
 2009         tresid = uio->uio_resid;
 2010         error = nfs_bioread(vp, uio, 0, ap->a_cred);
 2011 
 2012         if (!error && uio->uio_resid == tresid) {
 2013                 nfsstats.direofcache_misses++;
 2014         }
 2015 out:
 2016         return (error);
 2017 }
 2018 
 2019 /*
 2020  * Readdir rpc call.
 2021  * Called from below the buffer cache by nfs_doio().
 2022  */
 2023 int
 2024 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 2025 {
 2026         int len, left;
 2027         struct dirent *dp = NULL;
 2028         u_int32_t *tl;
 2029         caddr_t cp;
 2030         nfsuint64 *cookiep;
 2031         caddr_t bpos, dpos;
 2032         struct mbuf *mreq, *mrep, *md, *mb;
 2033         nfsuint64 cookie;
 2034         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2035         struct nfsnode *dnp = VTONFS(vp);
 2036         u_quad_t fileno;
 2037         int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1;
 2038         int attrflag;
 2039         int v3 = NFS_ISV3(vp);
 2040 
 2041 #ifndef DIAGNOSTIC
 2042         if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
 2043                 (uiop->uio_resid & (DIRBLKSIZ - 1)))
 2044                 panic("nfs readdirrpc bad uio");
 2045 #endif
 2046 
 2047         /*
 2048          * If there is no cookie, assume directory was stale.
 2049          */
 2050         nfs_dircookie_lock(dnp);
 2051         cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
 2052         if (cookiep) {
 2053                 cookie = *cookiep;
 2054                 nfs_dircookie_unlock(dnp);
 2055         } else {
 2056                 nfs_dircookie_unlock(dnp);              
 2057                 return (NFSERR_BAD_COOKIE);
 2058         }
 2059 
 2060         /*
 2061          * Loop around doing readdir rpc's of size nm_readdirsize
 2062          * truncated to a multiple of DIRBLKSIZ.
 2063          * The stopping criteria is EOF or buffer full.
 2064          */
 2065         while (more_dirs && bigenough) {
 2066                 nfsstats.rpccnt[NFSPROC_READDIR]++;
 2067                 mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) +
 2068                         NFSX_READDIR(v3));
 2069                 mb = mreq;
 2070                 bpos = mtod(mb, caddr_t);
 2071                 nfsm_fhtom(vp, v3);
 2072                 if (v3) {
 2073                         tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
 2074                         *tl++ = cookie.nfsuquad[0];
 2075                         *tl++ = cookie.nfsuquad[1];
 2076                         mtx_lock(&dnp->n_mtx);
 2077                         *tl++ = dnp->n_cookieverf.nfsuquad[0];
 2078                         *tl++ = dnp->n_cookieverf.nfsuquad[1];
 2079                         mtx_unlock(&dnp->n_mtx);
 2080                 } else {
 2081                         tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
 2082                         *tl++ = cookie.nfsuquad[0];
 2083                 }
 2084                 *tl = txdr_unsigned(nmp->nm_readdirsize);
 2085                 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred);
 2086                 if (v3) {
 2087                         nfsm_postop_attr(vp, attrflag);
 2088                         if (!error) {
 2089                                 tl = nfsm_dissect(u_int32_t *,
 2090                                     2 * NFSX_UNSIGNED);
 2091                                 mtx_lock(&dnp->n_mtx);
 2092                                 dnp->n_cookieverf.nfsuquad[0] = *tl++;
 2093                                 dnp->n_cookieverf.nfsuquad[1] = *tl;
 2094                                 mtx_unlock(&dnp->n_mtx);
 2095                         } else {
 2096                                 m_freem(mrep);
 2097                                 goto nfsmout;
 2098                         }
 2099                 }
 2100                 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2101                 more_dirs = fxdr_unsigned(int, *tl);
 2102 
 2103                 /* loop thru the dir entries, doctoring them to 4bsd form */
 2104                 while (more_dirs && bigenough) {
 2105                         if (v3) {
 2106                                 tl = nfsm_dissect(u_int32_t *,
 2107                                     3 * NFSX_UNSIGNED);
 2108                                 fileno = fxdr_hyper(tl);
 2109                                 len = fxdr_unsigned(int, *(tl + 2));
 2110                         } else {
 2111                                 tl = nfsm_dissect(u_int32_t *,
 2112                                     2 * NFSX_UNSIGNED);
 2113                                 fileno = fxdr_unsigned(u_quad_t, *tl++);
 2114                                 len = fxdr_unsigned(int, *tl);
 2115                         }
 2116                         if (len <= 0 || len > NFS_MAXNAMLEN) {
 2117                                 error = EBADRPC;
 2118                                 m_freem(mrep);
 2119                                 goto nfsmout;
 2120                         }
 2121                         tlen = nfsm_rndup(len);
 2122                         if (tlen == len)
 2123                                 tlen += 4;      /* To ensure null termination */
 2124                         left = DIRBLKSIZ - blksiz;
 2125                         if ((tlen + DIRHDSIZ) > left) {
 2126                                 dp->d_reclen += left;
 2127                                 uiop->uio_iov->iov_base =
 2128                                     (char *)uiop->uio_iov->iov_base + left;
 2129                                 uiop->uio_iov->iov_len -= left;
 2130                                 uiop->uio_offset += left;
 2131                                 uiop->uio_resid -= left;
 2132                                 blksiz = 0;
 2133                         }
 2134                         if ((tlen + DIRHDSIZ) > uiop->uio_resid)
 2135                                 bigenough = 0;
 2136                         if (bigenough) {
 2137                                 dp = (struct dirent *)uiop->uio_iov->iov_base;
 2138                                 dp->d_fileno = (int)fileno;
 2139                                 dp->d_namlen = len;
 2140                                 dp->d_reclen = tlen + DIRHDSIZ;
 2141                                 dp->d_type = DT_UNKNOWN;
 2142                                 blksiz += dp->d_reclen;
 2143                                 if (blksiz == DIRBLKSIZ)
 2144                                         blksiz = 0;
 2145                                 uiop->uio_offset += DIRHDSIZ;
 2146                                 uiop->uio_resid -= DIRHDSIZ;
 2147                                 uiop->uio_iov->iov_base =
 2148                                     (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
 2149                                 uiop->uio_iov->iov_len -= DIRHDSIZ;
 2150                                 nfsm_mtouio(uiop, len);
 2151                                 cp = uiop->uio_iov->iov_base;
 2152                                 tlen -= len;
 2153                                 *cp = '\0';     /* null terminate */
 2154                                 uiop->uio_iov->iov_base =
 2155                                     (char *)uiop->uio_iov->iov_base + tlen;
 2156                                 uiop->uio_iov->iov_len -= tlen;
 2157                                 uiop->uio_offset += tlen;
 2158                                 uiop->uio_resid -= tlen;
 2159                         } else
 2160                                 nfsm_adv(nfsm_rndup(len));
 2161                         if (v3) {
 2162                                 tl = nfsm_dissect(u_int32_t *,
 2163                                     3 * NFSX_UNSIGNED);
 2164                         } else {
 2165                                 tl = nfsm_dissect(u_int32_t *,
 2166                                     2 * NFSX_UNSIGNED);
 2167                         }
 2168                         if (bigenough) {
 2169                                 cookie.nfsuquad[0] = *tl++;
 2170                                 if (v3)
 2171                                         cookie.nfsuquad[1] = *tl++;
 2172                         } else if (v3)
 2173                                 tl += 2;
 2174                         else
 2175                                 tl++;
 2176                         more_dirs = fxdr_unsigned(int, *tl);
 2177                 }
 2178                 /*
 2179                  * If at end of rpc data, get the eof boolean
 2180                  */
 2181                 if (!more_dirs) {
 2182                         tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2183                         more_dirs = (fxdr_unsigned(int, *tl) == 0);
 2184                 }
 2185                 m_freem(mrep);
 2186         }
 2187         /*
 2188          * Fill last record, iff any, out to a multiple of DIRBLKSIZ
 2189          * by increasing d_reclen for the last record.
 2190          */
 2191         if (blksiz > 0) {
 2192                 left = DIRBLKSIZ - blksiz;
 2193                 dp->d_reclen += left;
 2194                 uiop->uio_iov->iov_base =
 2195                     (char *)uiop->uio_iov->iov_base + left;
 2196                 uiop->uio_iov->iov_len -= left;
 2197                 uiop->uio_offset += left;
 2198                 uiop->uio_resid -= left;
 2199         }
 2200 
 2201         /*
 2202          * We are now either at the end of the directory or have filled the
 2203          * block.
 2204          */
 2205         if (bigenough)
 2206                 dnp->n_direofoffset = uiop->uio_offset;
 2207         else {
 2208                 if (uiop->uio_resid > 0)
 2209                         nfs_printf("EEK! readdirrpc resid > 0\n");
 2210                 nfs_dircookie_lock(dnp);
 2211                 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
 2212                 *cookiep = cookie;
 2213                 nfs_dircookie_unlock(dnp);
 2214         }
 2215 nfsmout:
 2216         return (error);
 2217 }
 2218 
 2219 /*
 2220  * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc().
 2221  */
 2222 int
 2223 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 2224 {
 2225         int len, left;
 2226         struct dirent *dp;
 2227         u_int32_t *tl;
 2228         caddr_t cp;
 2229         struct vnode *newvp;
 2230         nfsuint64 *cookiep;
 2231         caddr_t bpos, dpos, dpossav1, dpossav2;
 2232         struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2;
 2233         struct nameidata nami, *ndp = &nami;
 2234         struct componentname *cnp = &ndp->ni_cnd;
 2235         nfsuint64 cookie;
 2236         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2237         struct nfsnode *dnp = VTONFS(vp), *np;
 2238         nfsfh_t *fhp;
 2239         u_quad_t fileno;
 2240         int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i;
 2241         int attrflag, fhsize;
 2242 
 2243 #ifndef nolint
 2244         dp = NULL;
 2245 #endif
 2246 #ifndef DIAGNOSTIC
 2247         if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
 2248                 (uiop->uio_resid & (DIRBLKSIZ - 1)))
 2249                 panic("nfs readdirplusrpc bad uio");
 2250 #endif
 2251         ndp->ni_dvp = vp;
 2252         newvp = NULLVP;
 2253 
 2254         /*
 2255          * If there is no cookie, assume directory was stale.
 2256          */
 2257         nfs_dircookie_lock(dnp);
 2258         cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
 2259         if (cookiep) {
 2260                 cookie = *cookiep;
 2261                 nfs_dircookie_unlock(dnp);
 2262         } else {
 2263                 nfs_dircookie_unlock(dnp);
 2264                 return (NFSERR_BAD_COOKIE);
 2265         }
 2266         /*
 2267          * Loop around doing readdir rpc's of size nm_readdirsize
 2268          * truncated to a multiple of DIRBLKSIZ.
 2269          * The stopping criteria is EOF or buffer full.
 2270          */
 2271         while (more_dirs && bigenough) {
 2272                 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
 2273                 mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS,
 2274                         NFSX_FH(1) + 6 * NFSX_UNSIGNED);
 2275                 mb = mreq;
 2276                 bpos = mtod(mb, caddr_t);
 2277                 nfsm_fhtom(vp, 1);
 2278                 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED);
 2279                 *tl++ = cookie.nfsuquad[0];
 2280                 *tl++ = cookie.nfsuquad[1];
 2281                 mtx_lock(&dnp->n_mtx);
 2282                 *tl++ = dnp->n_cookieverf.nfsuquad[0];
 2283                 *tl++ = dnp->n_cookieverf.nfsuquad[1];
 2284                 mtx_unlock(&dnp->n_mtx);
 2285                 *tl++ = txdr_unsigned(nmp->nm_readdirsize);
 2286                 *tl = txdr_unsigned(nmp->nm_rsize);
 2287                 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred);
 2288                 nfsm_postop_attr(vp, attrflag);
 2289                 if (error) {
 2290                         m_freem(mrep);
 2291                         goto nfsmout;
 2292                 }
 2293                 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
 2294                 mtx_lock(&dnp->n_mtx);
 2295                 dnp->n_cookieverf.nfsuquad[0] = *tl++;
 2296                 dnp->n_cookieverf.nfsuquad[1] = *tl++;
 2297                 mtx_unlock(&dnp->n_mtx);
 2298                 more_dirs = fxdr_unsigned(int, *tl);
 2299 
 2300                 /* loop thru the dir entries, doctoring them to 4bsd form */
 2301                 while (more_dirs && bigenough) {
 2302                         tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
 2303                         fileno = fxdr_hyper(tl);
 2304                         len = fxdr_unsigned(int, *(tl + 2));
 2305                         if (len <= 0 || len > NFS_MAXNAMLEN) {
 2306                                 error = EBADRPC;
 2307                                 m_freem(mrep);
 2308                                 goto nfsmout;
 2309                         }
 2310                         tlen = nfsm_rndup(len);
 2311                         if (tlen == len)
 2312                                 tlen += 4;      /* To ensure null termination*/
 2313                         left = DIRBLKSIZ - blksiz;
 2314                         if ((tlen + DIRHDSIZ) > left) {
 2315                                 dp->d_reclen += left;
 2316                                 uiop->uio_iov->iov_base =
 2317                                     (char *)uiop->uio_iov->iov_base + left;
 2318                                 uiop->uio_iov->iov_len -= left;
 2319                                 uiop->uio_offset += left;
 2320                                 uiop->uio_resid -= left;
 2321                                 blksiz = 0;
 2322                         }
 2323                         if ((tlen + DIRHDSIZ) > uiop->uio_resid)
 2324                                 bigenough = 0;
 2325                         if (bigenough) {
 2326                                 dp = (struct dirent *)uiop->uio_iov->iov_base;
 2327                                 dp->d_fileno = (int)fileno;
 2328                                 dp->d_namlen = len;
 2329                                 dp->d_reclen = tlen + DIRHDSIZ;
 2330                                 dp->d_type = DT_UNKNOWN;
 2331                                 blksiz += dp->d_reclen;
 2332                                 if (blksiz == DIRBLKSIZ)
 2333                                         blksiz = 0;
 2334                                 uiop->uio_offset += DIRHDSIZ;
 2335                                 uiop->uio_resid -= DIRHDSIZ;
 2336                                 uiop->uio_iov->iov_base =
 2337                                     (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
 2338                                 uiop->uio_iov->iov_len -= DIRHDSIZ;
 2339                                 cnp->cn_nameptr = uiop->uio_iov->iov_base;
 2340                                 cnp->cn_namelen = len;
 2341                                 nfsm_mtouio(uiop, len);
 2342                                 cp = uiop->uio_iov->iov_base;
 2343                                 tlen -= len;
 2344                                 *cp = '\0';
 2345                                 uiop->uio_iov->iov_base =
 2346                                     (char *)uiop->uio_iov->iov_base + tlen;
 2347                                 uiop->uio_iov->iov_len -= tlen;
 2348                                 uiop->uio_offset += tlen;
 2349                                 uiop->uio_resid -= tlen;
 2350                         } else
 2351                                 nfsm_adv(nfsm_rndup(len));
 2352                         tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
 2353                         if (bigenough) {
 2354                                 cookie.nfsuquad[0] = *tl++;
 2355                                 cookie.nfsuquad[1] = *tl++;
 2356                         } else
 2357                                 tl += 2;
 2358 
 2359                         /*
 2360                          * Since the attributes are before the file handle
 2361                          * (sigh), we must skip over the attributes and then
 2362                          * come back and get them.
 2363                          */
 2364                         attrflag = fxdr_unsigned(int, *tl);
 2365                         if (attrflag) {
 2366                             dpossav1 = dpos;
 2367                             mdsav1 = md;
 2368                             nfsm_adv(NFSX_V3FATTR);
 2369                             tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2370                             doit = fxdr_unsigned(int, *tl);
 2371                             /*
 2372                              * Skip loading the attrs for "..". There's a 
 2373                              * race between loading the attrs here and 
 2374                              * lookups that look for the directory currently
 2375                              * being read (in the parent). We try to acquire
 2376                              * the exclusive lock on ".." here, owning the 
 2377                              * lock on the directory being read. Lookup will
 2378                              * hold the lock on ".." and try to acquire the 
 2379                              * lock on the directory being read.
 2380                              * 
 2381                              * There are other ways of fixing this, one would
 2382                              * be to do a trylock on the ".." vnode and skip
 2383                              * loading the attrs on ".." if it happens to be 
 2384                              * locked by another process. But skipping the
 2385                              * attrload on ".." seems the easiest option.
 2386                              */
 2387                             if (strcmp(dp->d_name, "..") == 0) {
 2388                                     doit = 0;
 2389                                     /*
 2390                                      * We've already skipped over the attrs, 
 2391                                      * skip over the filehandle. And store d_type
 2392                                      * as VDIR.
 2393                                      */
 2394                                     tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2395                                     i = fxdr_unsigned(int, *tl);
 2396                                     nfsm_adv(nfsm_rndup(i));
 2397                                     dp->d_type = IFTODT(VTTOIF(VDIR));
 2398                             }       
 2399                             if (doit) {
 2400                                 nfsm_getfh(fhp, fhsize, 1);
 2401                                 if (NFS_CMPFH(dnp, fhp, fhsize)) {
 2402                                     VREF(vp);
 2403                                     newvp = vp;
 2404                                     np = dnp;
 2405                                 } else {
 2406                                     error = nfs_nget(vp->v_mount, fhp,
 2407                                         fhsize, &np, LK_EXCLUSIVE);
 2408                                     if (error)
 2409                                         doit = 0;
 2410                                     else
 2411                                         newvp = NFSTOV(np);
 2412                                 }
 2413                             }
 2414                             if (doit && bigenough) {
 2415                                 dpossav2 = dpos;
 2416                                 dpos = dpossav1;
 2417                                 mdsav2 = md;
 2418                                 md = mdsav1;
 2419                                 nfsm_loadattr(newvp, NULL);
 2420                                 dpos = dpossav2;
 2421                                 md = mdsav2;
 2422                                 dp->d_type =
 2423                                     IFTODT(VTTOIF(np->n_vattr.va_type));
 2424                                 ndp->ni_vp = newvp;
 2425                                 /* Update n_ctime, so subsequent lookup doesn't purge entry */
 2426                                 np->n_ctime = np->n_vattr.va_ctime.tv_sec;
 2427                                 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp);
 2428                             }
 2429                         } else {
 2430                             /* Just skip over the file handle */
 2431                             tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2432                             i = fxdr_unsigned(int, *tl);
 2433                             if (i) {
 2434                                     tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2435                                     fhsize = fxdr_unsigned(int, *tl);
 2436                                     nfsm_adv(nfsm_rndup(fhsize));
 2437                             }
 2438                         }
 2439                         if (newvp != NULLVP) {
 2440                             if (newvp == vp)
 2441                                 vrele(newvp);
 2442                             else
 2443                                 vput(newvp);
 2444                             newvp = NULLVP;
 2445                         }
 2446                         tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2447                         more_dirs = fxdr_unsigned(int, *tl);
 2448                 }
 2449                 /*
 2450                  * If at end of rpc data, get the eof boolean
 2451                  */
 2452                 if (!more_dirs) {
 2453                         tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2454                         more_dirs = (fxdr_unsigned(int, *tl) == 0);
 2455                 }
 2456                 m_freem(mrep);
 2457         }
 2458         /*
 2459          * Fill last record, iff any, out to a multiple of DIRBLKSIZ
 2460          * by increasing d_reclen for the last record.
 2461          */
 2462         if (blksiz > 0) {
 2463                 left = DIRBLKSIZ - blksiz;
 2464                 dp->d_reclen += left;
 2465                 uiop->uio_iov->iov_base =
 2466                     (char *)uiop->uio_iov->iov_base + left;
 2467                 uiop->uio_iov->iov_len -= left;
 2468                 uiop->uio_offset += left;
 2469                 uiop->uio_resid -= left;
 2470         }
 2471 
 2472         /*
 2473          * We are now either at the end of the directory or have filled the
 2474          * block.
 2475          */
 2476         if (bigenough)
 2477                 dnp->n_direofoffset = uiop->uio_offset;
 2478         else {
 2479                 if (uiop->uio_resid > 0)
 2480                         nfs_printf("EEK! readdirplusrpc resid > 0\n");
 2481                 nfs_dircookie_lock(dnp);
 2482                 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
 2483                 *cookiep = cookie;
 2484                 nfs_dircookie_unlock(dnp);
 2485         }
 2486 nfsmout:
 2487         if (newvp != NULLVP) {
 2488                 if (newvp == vp)
 2489                         vrele(newvp);
 2490                 else
 2491                         vput(newvp);
 2492                 newvp = NULLVP;
 2493         }
 2494         return (error);
 2495 }
 2496 
 2497 /*
 2498  * Silly rename. To make the NFS filesystem that is stateless look a little
 2499  * more like the "ufs" a remove of an active vnode is translated to a rename
 2500  * to a funny looking filename that is removed by nfs_inactive on the
 2501  * nfsnode. There is the potential for another process on a different client
 2502  * to create the same funny name between the nfs_lookitup() fails and the
 2503  * nfs_rename() completes, but...
 2504  */
 2505 static int
 2506 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2507 {
 2508         struct sillyrename *sp;
 2509         struct nfsnode *np;
 2510         int error;
 2511         short pid;
 2512         unsigned int lticks;
 2513 
 2514         cache_purge(dvp);
 2515         np = VTONFS(vp);
 2516 #ifndef DIAGNOSTIC
 2517         if (vp->v_type == VDIR)
 2518                 panic("nfs: sillyrename dir");
 2519 #endif
 2520         MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
 2521                 M_NFSREQ, M_WAITOK);
 2522         sp->s_cred = crhold(cnp->cn_cred);
 2523         sp->s_dvp = dvp;
 2524         sp->s_removeit = nfs_removeit;
 2525         VREF(dvp);
 2526 
 2527         /* 
 2528          * Fudge together a funny name.
 2529          * Changing the format of the funny name to accomodate more 
 2530          * sillynames per directory.
 2531          * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 
 2532          * CPU ticks since boot.
 2533          */
 2534         pid = cnp->cn_thread->td_proc->p_pid;
 2535         lticks = (unsigned int)ticks;
 2536         for ( ; ; ) {
 2537                 sp->s_namlen = sprintf(sp->s_name, 
 2538                                        ".nfs.%08x.%04x4.4", lticks, 
 2539                                        pid);
 2540                 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2541                                  cnp->cn_thread, NULL))
 2542                         break;
 2543                 lticks++;
 2544         }
 2545         error = nfs_renameit(dvp, cnp, sp);
 2546         if (error)
 2547                 goto bad;
 2548         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2549                 cnp->cn_thread, &np);
 2550         np->n_sillyrename = sp;
 2551         return (0);
 2552 bad:
 2553         vrele(sp->s_dvp);
 2554         crfree(sp->s_cred);
 2555         free((caddr_t)sp, M_NFSREQ);
 2556         return (error);
 2557 }
 2558 
 2559 /*
 2560  * Look up a file name and optionally either update the file handle or
 2561  * allocate an nfsnode, depending on the value of npp.
 2562  * npp == NULL  --> just do the lookup
 2563  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2564  *                      handled too
 2565  * *npp != NULL --> update the file handle in the vnode
 2566  */
 2567 static int
 2568 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred,
 2569     struct thread *td, struct nfsnode **npp)
 2570 {
 2571         struct vnode *newvp = NULL;
 2572         struct nfsnode *np, *dnp = VTONFS(dvp);
 2573         caddr_t bpos, dpos;
 2574         int error = 0, fhlen, attrflag;
 2575         struct mbuf *mreq, *mrep, *md, *mb;
 2576         nfsfh_t *nfhp;
 2577         int v3 = NFS_ISV3(dvp);
 2578 
 2579         nfsstats.rpccnt[NFSPROC_LOOKUP]++;
 2580         mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP,
 2581                 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
 2582         mb = mreq;
 2583         bpos = mtod(mb, caddr_t);
 2584         nfsm_fhtom(dvp, v3);
 2585         nfsm_strtom(name, len, NFS_MAXNAMLEN);
 2586         nfsm_request(dvp, NFSPROC_LOOKUP, td, cred);
 2587         if (npp && !error) {
 2588                 nfsm_getfh(nfhp, fhlen, v3);
 2589                 if (*npp) {
 2590                     np = *npp;
 2591                     if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) {
 2592                         free((caddr_t)np->n_fhp, M_NFSBIGFH);
 2593                         np->n_fhp = &np->n_fh;
 2594                     } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH)
 2595                         np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK);
 2596                     bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen);
 2597                     np->n_fhsize = fhlen;
 2598                     newvp = NFSTOV(np);
 2599                 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
 2600                     VREF(dvp);
 2601                     newvp = dvp;
 2602                 } else {
 2603                     error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE);
 2604                     if (error) {
 2605                         m_freem(mrep);
 2606                         return (error);
 2607                     }
 2608                     newvp = NFSTOV(np);
 2609                 }
 2610                 if (v3) {
 2611                         nfsm_postop_attr(newvp, attrflag);
 2612                         if (!attrflag && *npp == NULL) {
 2613                                 m_freem(mrep);
 2614                                 if (newvp == dvp)
 2615                                         vrele(newvp);
 2616                                 else
 2617                                         vput(newvp);
 2618                                 return (ENOENT);
 2619                         }
 2620                 } else
 2621                         nfsm_loadattr(newvp, NULL);
 2622         }
 2623         m_freem(mrep);
 2624 nfsmout:
 2625         if (npp && *npp == NULL) {
 2626                 if (error) {
 2627                         if (newvp) {
 2628                                 if (newvp == dvp)
 2629                                         vrele(newvp);
 2630                                 else
 2631                                         vput(newvp);
 2632                         }
 2633                 } else
 2634                         *npp = np;
 2635         }
 2636         return (error);
 2637 }
 2638 
 2639 /*
 2640  * Nfs Version 3 commit rpc
 2641  */
 2642 int
 2643 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2644            struct thread *td)
 2645 {
 2646         u_int32_t *tl;
 2647         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2648         caddr_t bpos, dpos;
 2649         int error = 0, wccflag = NFSV3_WCCRATTR;
 2650         struct mbuf *mreq, *mrep, *md, *mb;
 2651 
 2652         mtx_lock(&nmp->nm_mtx);
 2653         if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
 2654                 mtx_unlock(&nmp->nm_mtx);
 2655                 return (0);
 2656         }
 2657         mtx_unlock(&nmp->nm_mtx);
 2658         nfsstats.rpccnt[NFSPROC_COMMIT]++;
 2659         mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1));
 2660         mb = mreq;
 2661         bpos = mtod(mb, caddr_t);
 2662         nfsm_fhtom(vp, 1);
 2663         tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED);
 2664         txdr_hyper(offset, tl);
 2665         tl += 2;
 2666         *tl = txdr_unsigned(cnt);
 2667         nfsm_request(vp, NFSPROC_COMMIT, td, cred);
 2668         nfsm_wcc_data(vp, wccflag);
 2669         if (!error) {
 2670                 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF);
 2671                 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl,
 2672                         NFSX_V3WRITEVERF)) {
 2673                         bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
 2674                                 NFSX_V3WRITEVERF);
 2675                         error = NFSERR_STALEWRITEVERF;
 2676                 }
 2677         }
 2678         m_freem(mrep);
 2679 nfsmout:
 2680         return (error);
 2681 }
 2682 
 2683 /*
 2684  * Strategy routine.
 2685  * For async requests when nfsiod(s) are running, queue the request by
 2686  * calling nfs_asyncio(), otherwise just all nfs_doio() to do the
 2687  * request.
 2688  */
 2689 static int
 2690 nfs_strategy(struct vop_strategy_args *ap)
 2691 {
 2692         struct buf *bp = ap->a_bp;
 2693         struct ucred *cr;
 2694 
 2695         KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2696         KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp));
 2697 
 2698         if (bp->b_iocmd == BIO_READ)
 2699                 cr = bp->b_rcred;
 2700         else
 2701                 cr = bp->b_wcred;
 2702 
 2703         /*
 2704          * If the op is asynchronous and an i/o daemon is waiting
 2705          * queue the request, wake it up and wait for completion
 2706          * otherwise just do it ourselves.
 2707          */
 2708         if ((bp->b_flags & B_ASYNC) == 0 ||
 2709             nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
 2710                 (void)nfs_doio(ap->a_vp, bp, cr, curthread);
 2711         return (0);
 2712 }
 2713 
 2714 /*
 2715  * fsync vnode op. Just call nfs_flush() with commit == 1.
 2716  */
 2717 /* ARGSUSED */
 2718 static int
 2719 nfs_fsync(struct vop_fsync_args *ap)
 2720 {
 2721         return (nfs_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1));
 2722 }
 2723 
 2724 /*
 2725  * Flush all the blocks associated with a vnode.
 2726  *      Walk through the buffer pool and push any dirty pages
 2727  *      associated with the vnode.
 2728  */
 2729 static int
 2730 nfs_flush(struct vnode *vp, int waitfor, struct thread *td,
 2731     int commit)
 2732 {
 2733         struct nfsnode *np = VTONFS(vp);
 2734         struct buf *bp;
 2735         int i;
 2736         struct buf *nbp;
 2737         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2738         int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2739         int passone = 1;
 2740         u_quad_t off, endoff, toff;
 2741         struct ucred* wcred = NULL;
 2742         struct buf **bvec = NULL;
 2743 #ifndef NFS_COMMITBVECSIZ
 2744 #define NFS_COMMITBVECSIZ       20
 2745 #endif
 2746         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2747         int bvecsize = 0, bveccount;
 2748 
 2749         if (nmp->nm_flag & NFSMNT_INT)
 2750                 slpflag = PCATCH;
 2751         if (!commit)
 2752                 passone = 0;
 2753         /*
 2754          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2755          * server, but has not been committed to stable storage on the server
 2756          * yet. On the first pass, the byte range is worked out and the commit
 2757          * rpc is done. On the second pass, nfs_writebp() is called to do the
 2758          * job.
 2759          */
 2760 again:
 2761         off = (u_quad_t)-1;
 2762         endoff = 0;
 2763         bvecpos = 0;
 2764         if (NFS_ISV3(vp) && commit) {
 2765                 s = splbio();
 2766                 if (bvec != NULL && bvec != bvec_on_stack)
 2767                         free(bvec, M_TEMP);
 2768                 /*
 2769                  * Count up how many buffers waiting for a commit.
 2770                  */
 2771                 bveccount = 0;
 2772                 VI_LOCK(vp);
 2773                 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
 2774                         if (BUF_REFCNT(bp) == 0 &&
 2775                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2776                                 == (B_DELWRI | B_NEEDCOMMIT))
 2777                                 bveccount++;
 2778                 }
 2779                 /*
 2780                  * Allocate space to remember the list of bufs to commit.  It is
 2781                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 2782                  * If we can't get memory (for whatever reason), we will end up
 2783                  * committing the buffers one-by-one in the loop below.
 2784                  */
 2785                 if (bveccount > NFS_COMMITBVECSIZ) {
 2786                         /*
 2787                          * Release the vnode interlock to avoid a lock
 2788                          * order reversal.
 2789                          */
 2790                         VI_UNLOCK(vp);
 2791                         bvec = (struct buf **)
 2792                                 malloc(bveccount * sizeof(struct buf *),
 2793                                        M_TEMP, M_NOWAIT);
 2794                         VI_LOCK(vp);
 2795                         if (bvec == NULL) {
 2796                                 bvec = bvec_on_stack;
 2797                                 bvecsize = NFS_COMMITBVECSIZ;
 2798                         } else
 2799                                 bvecsize = bveccount;
 2800                 } else {
 2801                         bvec = bvec_on_stack;
 2802                         bvecsize = NFS_COMMITBVECSIZ;
 2803                 }
 2804                 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
 2805                         if (bvecpos >= bvecsize)
 2806                                 break;
 2807                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2808                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2809                                 continue;
 2810                         }
 2811                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2812                             (B_DELWRI | B_NEEDCOMMIT)) {
 2813                                 BUF_UNLOCK(bp);
 2814                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2815                                 continue;
 2816                         }
 2817                         VI_UNLOCK(vp);
 2818                         bremfree(bp);
 2819                         /*
 2820                          * Work out if all buffers are using the same cred
 2821                          * so we can deal with them all with one commit.
 2822                          *
 2823                          * NOTE: we are not clearing B_DONE here, so we have
 2824                          * to do it later on in this routine if we intend to
 2825                          * initiate I/O on the bp.
 2826                          *
 2827                          * Note: to avoid loopback deadlocks, we do not
 2828                          * assign b_runningbufspace.
 2829                          */
 2830                         if (wcred == NULL)
 2831                                 wcred = bp->b_wcred;
 2832                         else if (wcred != bp->b_wcred)
 2833                                 wcred = NOCRED;
 2834                         vfs_busy_pages(bp, 1);
 2835 
 2836                         VI_LOCK(vp);
 2837                         /*
 2838                          * bp is protected by being locked, but nbp is not
 2839                          * and vfs_busy_pages() may sleep.  We have to
 2840                          * recalculate nbp.
 2841                          */
 2842                         nbp = TAILQ_NEXT(bp, b_bobufs);
 2843 
 2844                         /*
 2845                          * A list of these buffers is kept so that the
 2846                          * second loop knows which buffers have actually
 2847                          * been committed. This is necessary, since there
 2848                          * may be a race between the commit rpc and new
 2849                          * uncommitted writes on the file.
 2850                          */
 2851                         bvec[bvecpos++] = bp;
 2852                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2853                                 bp->b_dirtyoff;
 2854                         if (toff < off)
 2855                                 off = toff;
 2856                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2857                         if (toff > endoff)
 2858                                 endoff = toff;
 2859                 }
 2860                 splx(s);
 2861                 VI_UNLOCK(vp);
 2862         }
 2863         if (bvecpos > 0) {
 2864                 /*
 2865                  * Commit data on the server, as required.
 2866                  * If all bufs are using the same wcred, then use that with
 2867                  * one call for all of them, otherwise commit each one
 2868                  * separately.
 2869                  */
 2870                 if (wcred != NOCRED)
 2871                         retv = nfs_commit(vp, off, (int)(endoff - off),
 2872                                           wcred, td);
 2873                 else {
 2874                         retv = 0;
 2875                         for (i = 0; i < bvecpos; i++) {
 2876                                 off_t off, size;
 2877                                 bp = bvec[i];
 2878                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2879                                         bp->b_dirtyoff;
 2880                                 size = (u_quad_t)(bp->b_dirtyend
 2881                                                   - bp->b_dirtyoff);
 2882                                 retv = nfs_commit(vp, off, (int)size,
 2883                                                   bp->b_wcred, td);
 2884                                 if (retv) break;
 2885                         }
 2886                 }
 2887 
 2888                 if (retv == NFSERR_STALEWRITEVERF)
 2889                         nfs_clearcommit(vp->v_mount);
 2890 
 2891                 /*
 2892                  * Now, either mark the blocks I/O done or mark the
 2893                  * blocks dirty, depending on whether the commit
 2894                  * succeeded.
 2895                  */
 2896                 for (i = 0; i < bvecpos; i++) {
 2897                         bp = bvec[i];
 2898                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 2899                         if (retv) {
 2900                                 /*
 2901                                  * Error, leave B_DELWRI intact
 2902                                  */
 2903                                 vfs_unbusy_pages(bp);
 2904                                 brelse(bp);
 2905                         } else {
 2906                                 /*
 2907                                  * Success, remove B_DELWRI ( bundirty() ).
 2908                                  *
 2909                                  * b_dirtyoff/b_dirtyend seem to be NFS
 2910                                  * specific.  We should probably move that
 2911                                  * into bundirty(). XXX
 2912                                  */
 2913                                 s = splbio();
 2914                                 bufobj_wref(&vp->v_bufobj);
 2915                                 bp->b_flags |= B_ASYNC;
 2916                                 bundirty(bp);
 2917                                 bp->b_flags &= ~B_DONE;
 2918                                 bp->b_ioflags &= ~BIO_ERROR;
 2919                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2920                                 splx(s);
 2921                                 bufdone(bp);
 2922                         }
 2923                 }
 2924         }
 2925 
 2926         /*
 2927          * Start/do any write(s) that are required.
 2928          */
 2929 loop:
 2930         s = splbio();
 2931         VI_LOCK(vp);
 2932         TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
 2933                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2934                         if (waitfor != MNT_WAIT || passone)
 2935                                 continue;
 2936 
 2937                         error = BUF_TIMELOCK(bp,
 2938                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 2939                             VI_MTX(vp), "nfsfsync", slpflag, slptimeo);
 2940                         splx(s);
 2941                         if (error == 0) {
 2942                                 BUF_UNLOCK(bp);
 2943                                 goto loop;
 2944                         }
 2945                         if (error == ENOLCK)
 2946                                 goto loop;
 2947                         if (nfs_sigintr(nmp, NULL, td)) {
 2948                                 error = EINTR;
 2949                                 goto done;
 2950                         }
 2951                         if (slpflag == PCATCH) {
 2952                                 slpflag = 0;
 2953                                 slptimeo = 2 * hz;
 2954                         }
 2955                         goto loop;
 2956                 }
 2957                 if ((bp->b_flags & B_DELWRI) == 0)
 2958                         panic("nfs_fsync: not dirty");
 2959                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 2960                         BUF_UNLOCK(bp);
 2961                         continue;
 2962                 }
 2963                 VI_UNLOCK(vp);
 2964                 bremfree(bp);
 2965                 if (passone || !commit)
 2966                     bp->b_flags |= B_ASYNC;
 2967                 else
 2968                     bp->b_flags |= B_ASYNC;
 2969                 splx(s);
 2970                 bwrite(bp);
 2971                 if (nfs_sigintr(nmp, NULL, td)) {
 2972                         error = EINTR;
 2973                         goto done;
 2974                 }
 2975                 goto loop;
 2976         }
 2977         splx(s);
 2978         if (passone) {
 2979                 passone = 0;
 2980                 VI_UNLOCK(vp);
 2981                 goto again;
 2982         }
 2983         if (waitfor == MNT_WAIT) {
 2984                 while (vp->v_bufobj.bo_numoutput) {
 2985                         error = bufobj_wwait(&vp->v_bufobj, slpflag, slptimeo);
 2986                         if (error) {
 2987                             VI_UNLOCK(vp);
 2988                             error = nfs_sigintr(nmp, NULL, td);
 2989                             if (error)
 2990                                 goto done;
 2991                             if (slpflag == PCATCH) {
 2992                                 slpflag = 0;
 2993                                 slptimeo = 2 * hz;
 2994                             }
 2995                             VI_LOCK(vp);
 2996                         }
 2997                 }
 2998                 if (vp->v_bufobj.bo_dirty.bv_cnt != 0 && commit) {
 2999                         VI_UNLOCK(vp);
 3000                         goto loop;
 3001                 }
 3002                 /*
 3003                  * Wait for all the async IO requests to drain
 3004                  */
 3005                 VI_UNLOCK(vp);
 3006                 mtx_lock(&np->n_mtx);
 3007                 while (np->n_directio_asyncwr > 0) {
 3008                         np->n_flag |= NFSYNCWAIT;
 3009                         error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr,
 3010                                            &np->n_mtx, slpflag | (PRIBIO + 1), 
 3011                                            "nfsfsync", 0);
 3012                         if (error) {
 3013                                 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) {
 3014                                         mtx_unlock(&np->n_mtx);
 3015                                         error = EINTR;  
 3016                                         goto done;
 3017                                 }
 3018                         }
 3019                 }
 3020                 mtx_unlock(&np->n_mtx);
 3021         } else
 3022                 VI_UNLOCK(vp);
 3023         mtx_lock(&np->n_mtx);
 3024         if (np->n_flag & NWRITEERR) {
 3025                 error = np->n_error;
 3026                 np->n_flag &= ~NWRITEERR;
 3027         }
 3028         if (commit && vp->v_bufobj.bo_dirty.bv_cnt == 0 &&
 3029             vp->v_bufobj.bo_numoutput == 0 && np->n_directio_asyncwr == 0)
 3030                 np->n_flag &= ~NMODIFIED;
 3031         mtx_unlock(&np->n_mtx);
 3032 done:
 3033         if (bvec != NULL && bvec != bvec_on_stack)
 3034                 free(bvec, M_TEMP);
 3035         return (error);
 3036 }
 3037 
 3038 /*
 3039  * NFS advisory byte-level locks.
 3040  */
 3041 static int
 3042 nfs_advlock(struct vop_advlock_args *ap)
 3043 {
 3044         int error;
 3045         
 3046         mtx_lock(&Giant);
 3047         if ((VFSTONFS(ap->a_vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3048                 struct nfsnode *np = VTONFS(ap->a_vp);
 3049 
 3050                 error = lf_advlock(ap, &(np->n_lockf), np->n_size);
 3051                 goto out;
 3052         }
 3053         error = nfs_dolock(ap);
 3054 out:    
 3055         mtx_unlock(&Giant);
 3056         return (error);
 3057 }
 3058 
 3059 /*
 3060  * Print out the contents of an nfsnode.
 3061  */
 3062 static int
 3063 nfs_print(struct vop_print_args *ap)
 3064 {
 3065         struct vnode *vp = ap->a_vp;
 3066         struct nfsnode *np = VTONFS(vp);
 3067 
 3068         nfs_printf("\tfileid %ld fsid 0x%x",
 3069            np->n_vattr.va_fileid, np->n_vattr.va_fsid);
 3070         if (vp->v_type == VFIFO)
 3071                 fifo_printinfo(vp);
 3072         printf("\n");
 3073         return (0);
 3074 }
 3075 
 3076 /*
 3077  * This is the "real" nfs::bwrite(struct buf*).
 3078  * We set B_CACHE if this is a VMIO buffer.
 3079  */
 3080 int
 3081 nfs_writebp(struct buf *bp, int force __unused, struct thread *td)
 3082 {
 3083         int s;
 3084         int oldflags = bp->b_flags;
 3085 #if 0
 3086         int retv = 1;
 3087         off_t off;
 3088 #endif
 3089 
 3090         if (BUF_REFCNT(bp) == 0)
 3091                 panic("bwrite: buffer is not locked???");
 3092 
 3093         if (bp->b_flags & B_INVAL) {
 3094                 brelse(bp);
 3095                 return(0);
 3096         }
 3097 
 3098         bp->b_flags |= B_CACHE;
 3099 
 3100         /*
 3101          * Undirty the bp.  We will redirty it later if the I/O fails.
 3102          */
 3103 
 3104         s = splbio();
 3105         bundirty(bp);
 3106         bp->b_flags &= ~B_DONE;
 3107         bp->b_ioflags &= ~BIO_ERROR;
 3108         bp->b_iocmd = BIO_WRITE;
 3109 
 3110         bufobj_wref(bp->b_bufobj);
 3111         curthread->td_ru.ru_oublock++;
 3112         splx(s);
 3113 
 3114         /*
 3115          * Note: to avoid loopback deadlocks, we do not
 3116          * assign b_runningbufspace.
 3117          */
 3118         vfs_busy_pages(bp, 1);
 3119 
 3120         BUF_KERNPROC(bp);
 3121         bp->b_iooffset = dbtob(bp->b_blkno);
 3122         bstrategy(bp);
 3123 
 3124         if( (oldflags & B_ASYNC) == 0) {
 3125                 int rtval = bufwait(bp);
 3126 
 3127                 if (oldflags & B_DELWRI) {
 3128                         s = splbio();
 3129                         reassignbuf(bp);
 3130                         splx(s);
 3131                 }
 3132                 brelse(bp);
 3133                 return (rtval);
 3134         }
 3135 
 3136         return (0);
 3137 }
 3138 
 3139 /*
 3140  * nfs special file access vnode op.
 3141  * Essentially just get vattr and then imitate iaccess() since the device is
 3142  * local to the client.
 3143  */
 3144 static int
 3145 nfsspec_access(struct vop_access_args *ap)
 3146 {
 3147         struct vattr *vap;
 3148         struct ucred *cred = ap->a_cred;
 3149         struct vnode *vp = ap->a_vp;
 3150         mode_t mode = ap->a_mode;
 3151         struct vattr vattr;
 3152         int error;
 3153 
 3154         /*
 3155          * Disallow write attempts on filesystems mounted read-only;
 3156          * unless the file is a socket, fifo, or a block or character
 3157          * device resident on the filesystem.
 3158          */
 3159         if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3160                 switch (vp->v_type) {
 3161                 case VREG:
 3162                 case VDIR:
 3163                 case VLNK:
 3164                         return (EROFS);
 3165                 default:
 3166                         break;
 3167                 }
 3168         }
 3169         vap = &vattr;
 3170         error = VOP_GETATTR(vp, vap, cred, ap->a_td);
 3171         if (error)
 3172                 goto out;
 3173         error  = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
 3174                          mode, cred, NULL);
 3175 out:
 3176         return error;
 3177 }
 3178 
 3179 /*
 3180  * Read wrapper for fifos.
 3181  */
 3182 static int
 3183 nfsfifo_read(struct vop_read_args *ap)
 3184 {
 3185         struct nfsnode *np = VTONFS(ap->a_vp);
 3186         int error;
 3187 
 3188         /*
 3189          * Set access flag.
 3190          */
 3191         mtx_lock(&np->n_mtx);
 3192         np->n_flag |= NACC;
 3193         getnanotime(&np->n_atim);
 3194         mtx_unlock(&np->n_mtx);
 3195         error = fifo_specops.vop_read(ap);
 3196         return error;   
 3197 }
 3198 
 3199 /*
 3200  * Write wrapper for fifos.
 3201  */
 3202 static int
 3203 nfsfifo_write(struct vop_write_args *ap)
 3204 {
 3205         struct nfsnode *np = VTONFS(ap->a_vp);
 3206 
 3207         /*
 3208          * Set update flag.
 3209          */
 3210         mtx_lock(&np->n_mtx);
 3211         np->n_flag |= NUPD;
 3212         getnanotime(&np->n_mtim);
 3213         mtx_unlock(&np->n_mtx);
 3214         return(fifo_specops.vop_write(ap));
 3215 }
 3216 
 3217 /*
 3218  * Close wrapper for fifos.
 3219  *
 3220  * Update the times on the nfsnode then do fifo close.
 3221  */
 3222 static int
 3223 nfsfifo_close(struct vop_close_args *ap)
 3224 {
 3225         struct vnode *vp = ap->a_vp;
 3226         struct nfsnode *np = VTONFS(vp);
 3227         struct vattr vattr;
 3228         struct timespec ts;
 3229 
 3230         mtx_lock(&np->n_mtx);
 3231         if (np->n_flag & (NACC | NUPD)) {
 3232                 getnanotime(&ts);
 3233                 if (np->n_flag & NACC)
 3234                         np->n_atim = ts;
 3235                 if (np->n_flag & NUPD)
 3236                         np->n_mtim = ts;
 3237                 np->n_flag |= NCHG;
 3238                 if (vrefcnt(vp) == 1 &&
 3239                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3240                         VATTR_NULL(&vattr);
 3241                         if (np->n_flag & NACC)
 3242                                 vattr.va_atime = np->n_atim;
 3243                         if (np->n_flag & NUPD)
 3244                                 vattr.va_mtime = np->n_mtim;
 3245                         mtx_unlock(&np->n_mtx);
 3246                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_td);
 3247                         goto out;
 3248                 }
 3249         }
 3250         mtx_unlock(&np->n_mtx);
 3251 out:
 3252         return (fifo_specops.vop_close(ap));
 3253 }
 3254 
 3255 /*
 3256  * Just call nfs_writebp() with the force argument set to 1.
 3257  *
 3258  * NOTE: B_DONE may or may not be set in a_bp on call.
 3259  */
 3260 static int
 3261 nfs_bwrite(struct buf *bp)
 3262 {
 3263 
 3264         return (nfs_writebp(bp, 1, curthread));
 3265 }
 3266 
 3267 struct buf_ops buf_ops_nfs = {
 3268         .bop_name       =       "buf_ops_nfs",
 3269         .bop_write      =       nfs_bwrite,
 3270         .bop_strategy   =       bufstrategy,
 3271         .bop_sync       =       bufsync,
 3272         .bop_bdflush    =       bufbdflush,
 3273 };

Cache object: a8508f0d7461edbf79585ced09e42209


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