The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/nfs4client/nfs4_vnops.c

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    1 /* $Id: nfs_vnops.c,v 1.45 2003/11/05 14:59:02 rees Exp $ */
    2 
    3 /*-
    4  * copyright (c) 2003
    5  * the regents of the university of michigan
    6  * all rights reserved
    7  * 
    8  * permission is granted to use, copy, create derivative works and redistribute
    9  * this software and such derivative works for any purpose, so long as the name
   10  * of the university of michigan is not used in any advertising or publicity
   11  * pertaining to the use or distribution of this software without specific,
   12  * written prior authorization.  if the above copyright notice or any other
   13  * identification of the university of michigan is included in any copy of any
   14  * portion of this software, then the disclaimer below must also be included.
   15  * 
   16  * this software is provided as is, without representation from the university
   17  * of michigan as to its fitness for any purpose, and without warranty by the
   18  * university of michigan of any kind, either express or implied, including
   19  * without limitation the implied warranties of merchantability and fitness for
   20  * a particular purpose. the regents of the university of michigan shall not be
   21  * liable for any damages, including special, indirect, incidental, or
   22  * consequential damages, with respect to any claim arising out of or in
   23  * connection with the use of the software, even if it has been or is hereafter
   24  * advised of the possibility of such damages.
   25  */
   26 
   27 /*
   28  * Copyright (c) 1989, 1993
   29  *      The Regents of the University of California.  All rights reserved.
   30  *
   31  * This code is derived from software contributed to Berkeley by
   32  * Rick Macklem at The University of Guelph.
   33  *
   34  * Redistribution and use in source and binary forms, with or without
   35  * modification, are permitted provided that the following conditions
   36  * are met:
   37  * 1. Redistributions of source code must retain the above copyright
   38  *    notice, this list of conditions and the following disclaimer.
   39  * 2. Redistributions in binary form must reproduce the above copyright
   40  *    notice, this list of conditions and the following disclaimer in the
   41  *    documentation and/or other materials provided with the distribution.
   42  * 4. Neither the name of the University nor the names of its contributors
   43  *    may be used to endorse or promote products derived from this software
   44  *    without specific prior written permission.
   45  *
   46  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   56  * SUCH DAMAGE.
   57  *
   58  *      @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95
   59  */
   60 
   61 #include <sys/cdefs.h>
   62 __FBSDID("$FreeBSD: releng/7.3/sys/nfs4client/nfs4_vnops.c 181119 2008-08-01 09:46:19Z kib $");
   63 
   64 /*
   65  * vnode op calls for Sun NFS version 2 and 3
   66  */
   67 
   68 #include "opt_inet.h"
   69 
   70 #include <sys/param.h>
   71 #include <sys/kernel.h>
   72 #include <sys/systm.h>
   73 #include <sys/resourcevar.h>
   74 #include <sys/proc.h>
   75 #include <sys/mount.h>
   76 #include <sys/bio.h>
   77 #include <sys/buf.h>
   78 #include <sys/malloc.h>
   79 #include <sys/mbuf.h>
   80 #include <sys/namei.h>
   81 #include <sys/socket.h>
   82 #include <sys/vnode.h>
   83 #include <sys/dirent.h>
   84 #include <sys/fcntl.h>
   85 #include <sys/lockf.h>
   86 #include <sys/stat.h>
   87 #include <sys/sysctl.h>
   88 #include <sys/lockmgr.h>
   89 #include <sys/signalvar.h>
   90 
   91 #include <vm/vm.h>
   92 #include <vm/vm_extern.h>
   93 
   94 #include <fs/fifofs/fifo.h>
   95 
   96 #include <rpc/rpcclnt.h>
   97 
   98 #include <nfs/rpcv2.h>
   99 #include <nfs/nfsproto.h>
  100 #include <nfsclient/nfs.h>
  101 #include <nfs4client/nfs4.h>
  102 #include <nfsclient/nfsnode.h>
  103 #include <nfsclient/nfsmount.h>
  104 #include <nfsclient/nfs_lock.h>
  105 #include <nfs/xdr_subs.h>
  106 #include <nfsclient/nfsm_subs.h>
  107 
  108 #include <net/if.h>
  109 #include <netinet/in.h>
  110 #include <netinet/in_var.h>
  111 
  112 /* NFSv4 */
  113 #include <nfs4client/nfs4m_subs.h>
  114 #include <nfs4client/nfs4_vn.h>
  115 
  116 /* Defs */
  117 #define TRUE    1
  118 #define FALSE   0
  119 
  120 /*
  121  * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
  122  * calls are not in getblk() and brelse() so that they would not be necessary
  123  * here.
  124  */
  125 #ifndef B_VMIO
  126 #define vfs_busy_pages(bp, f)
  127 #endif
  128 
  129 static int      nfs4_flush(struct vnode *, int, struct thread *,
  130                     int);
  131 static int      nfs4_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
  132                     struct thread *);
  133 static int      nfs4_closerpc(struct vnode *, struct ucred *, struct thread *, int);
  134 
  135 static vop_lookup_t     nfs4_lookup;
  136 static vop_create_t     nfs4_create;
  137 static vop_mknod_t      nfs4_mknod;
  138 static vop_open_t       nfs4_open;
  139 static vop_close_t      nfs4_close;
  140 static vop_access_t     nfs4_access;
  141 static vop_getattr_t    nfs4_getattr;
  142 static vop_setattr_t    nfs4_setattr;
  143 static vop_read_t       nfs4_read;
  144 static vop_fsync_t      nfs4_fsync;
  145 static vop_remove_t     nfs4_remove;
  146 static vop_link_t       nfs4_link;
  147 static vop_rename_t     nfs4_rename;
  148 static vop_mkdir_t      nfs4_mkdir;
  149 static vop_rmdir_t      nfs4_rmdir;
  150 static vop_symlink_t    nfs4_symlink;
  151 static vop_readdir_t    nfs4_readdir;
  152 static vop_strategy_t   nfs4_strategy;
  153 static  int     nfs4_lookitup(struct vnode *, const char *, int,
  154                     struct ucred *, struct thread *, struct nfsnode **);
  155 static  int     nfs4_sillyrename(struct vnode *, struct vnode *,
  156                     struct componentname *);
  157 static vop_readlink_t   nfs4_readlink;
  158 static vop_print_t      nfs4_print;
  159 static vop_advlock_t    nfs4_advlock;
  160 static vop_advlockasync_t nfs4_advlockasync;
  161 
  162 /*
  163  * Global vfs data structures for nfs
  164  */
  165 struct vop_vector nfs4_vnodeops = {
  166         .vop_default =          &default_vnodeops,
  167         .vop_access =           nfs4_access,
  168         .vop_advlock =          nfs4_advlock,
  169         .vop_advlockasync =     nfs4_advlockasync,
  170         .vop_close =            nfs4_close,
  171         .vop_create =           nfs4_create,
  172         .vop_fsync =            nfs4_fsync,
  173         .vop_getattr =          nfs4_getattr,
  174         .vop_getpages =         nfs_getpages,
  175         .vop_putpages =         nfs_putpages,
  176         .vop_inactive =         nfs_inactive,
  177         .vop_lease =            VOP_NULL,
  178         .vop_link =             nfs4_link,
  179         .vop_lookup =           nfs4_lookup,
  180         .vop_mkdir =            nfs4_mkdir,
  181         .vop_mknod =            nfs4_mknod,
  182         .vop_open =             nfs4_open,
  183         .vop_print =            nfs4_print,
  184         .vop_read =             nfs4_read,
  185         .vop_readdir =          nfs4_readdir,
  186         .vop_readlink =         nfs4_readlink,
  187         .vop_reclaim =          nfs_reclaim,
  188         .vop_remove =           nfs4_remove,
  189         .vop_rename =           nfs4_rename,
  190         .vop_rmdir =            nfs4_rmdir,
  191         .vop_setattr =          nfs4_setattr,
  192         .vop_strategy =         nfs4_strategy,
  193         .vop_symlink =          nfs4_symlink,
  194         .vop_write =            nfs_write,
  195 };
  196 
  197 static int      nfs4_removerpc(struct vnode *dvp, const char *name, int namelen,
  198                               struct ucred *cred, struct thread *td);
  199 static int      nfs4_renamerpc(struct vnode *fdvp, const char *fnameptr,
  200                               int fnamelen, struct vnode *tdvp,
  201                               const char *tnameptr, int tnamelen,
  202                               struct ucred *cred, struct thread *td);
  203 static int      nfs4_renameit(struct vnode *sdvp, struct componentname *scnp,
  204                              struct sillyrename *sp);
  205 static int      nfs4_openrpc(struct vnode *, struct vnode **,
  206                             struct componentname *, int, struct vattr *);
  207 static int      nfs4_open_confirm(struct vnode *vp, struct nfs4_compound *cpp,
  208                                  struct nfs4_oparg_open *openap,
  209                                  struct nfs4_oparg_getfh *gfh,
  210                                  struct ucred *cred, struct thread *td);
  211 static int      nfs4_createrpc(struct vnode *, struct vnode **,
  212                               struct componentname *, nfstype,
  213                               struct vattr *, char *);
  214 
  215 /*
  216  * Global variables
  217  */
  218 struct nfs4_lowner nfs4_masterlowner;
  219 
  220 #define DIRHDSIZ        (sizeof (struct dirent) - (MAXNAMLEN + 1))
  221 
  222 SYSCTL_DECL(_vfs_nfs4);
  223 
  224 static int      nfs4_access_cache_timeout = NFS_MAXATTRTIMO;
  225 SYSCTL_INT(_vfs_nfs4, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
  226            &nfs4_access_cache_timeout, 0, "NFS ACCESS cache timeout");
  227 
  228 #if 0
  229 static int      nfsv3_commit_on_close = 0;
  230 SYSCTL_INT(_vfs_nfs4, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW,
  231            &nfsv3_commit_on_close, 0, "write+commit on close, else only write");
  232 
  233 SYSCTL_INT(_vfs_nfs4, OID_AUTO, access_cache_hits, CTLFLAG_RD,
  234            &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
  235 
  236 SYSCTL_INT(_vfs_nfs4, OID_AUTO, access_cache_misses, CTLFLAG_RD,
  237            &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
  238 #endif
  239 
  240 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY          \
  241                          | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE     \
  242                          | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP)
  243 static int
  244 nfs4_v3_access_otw(struct vnode *vp, int wmode, struct thread *td,
  245     struct ucred *cred)
  246 {
  247         const int v3 = 1;
  248         u_int32_t *tl;
  249         int error = 0, attrflag;
  250 
  251         return (0);
  252 
  253         struct mbuf *mreq, *mrep = NULL, *md, *mb;
  254         caddr_t bpos, dpos;
  255         u_int32_t rmode;
  256         struct nfsnode *np = VTONFS(vp);
  257 
  258         nfsstats.rpccnt[NFSPROC_ACCESS]++;
  259         mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED);
  260         mb = mreq;
  261         bpos = mtod(mb, caddr_t);
  262         nfsm_fhtom(vp, v3);
  263         tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
  264         *tl = txdr_unsigned(wmode);
  265         nfsm_request(vp, NFSPROC_ACCESS, td, cred);
  266         nfsm_postop_attr(vp, attrflag);
  267         if (!error) {
  268                 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
  269                 rmode = fxdr_unsigned(u_int32_t, *tl);
  270                 np->n_mode = rmode;
  271                 np->n_modeuid = cred->cr_uid;
  272                 np->n_modestamp = time_second;
  273         }
  274         m_freem(mrep);
  275 nfsmout:
  276         return error;
  277 }
  278 
  279 /*
  280  * nfs access vnode op.
  281  * For nfs version 2, just return ok. File accesses may fail later.
  282  * For nfs version 3, use the access rpc to check accessibility. If file modes
  283  * are changed on the server, accesses might still fail later.
  284  */
  285 static int
  286 nfs4_access(struct vop_access_args *ap)
  287 {
  288         struct vnode *vp = ap->a_vp;
  289         int error = 0;
  290         u_int32_t mode, wmode;
  291         int v3 = NFS_ISV3(vp);  /* v3 \in v4 */
  292         struct nfsnode *np = VTONFS(vp);
  293         caddr_t bpos, dpos;
  294         struct mbuf *mreq, *mrep = NULL, *md, *mb;
  295         struct nfs4_compound cp;
  296         struct nfs4_oparg_access acc;
  297         struct thread *td = ap->a_td;
  298         struct ucred *cred = ap->a_cred;
  299 
  300         /*
  301          * Disallow write attempts on filesystems mounted read-only;
  302          * unless the file is a socket, fifo, or a block or character
  303          * device resident on the filesystem.
  304          */
  305         if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
  306                 switch (vp->v_type) {
  307                 case VREG:
  308                 case VDIR:
  309                 case VLNK:
  310                         return (EROFS);
  311                 default:
  312                         break;
  313                 }
  314         }
  315         /*
  316          * For nfs v3, check to see if we have done this recently, and if
  317          * so return our cached result instead of making an ACCESS call.
  318          * If not, do an access rpc, otherwise you are stuck emulating
  319          * ufs_access() locally using the vattr. This may not be correct,
  320          * since the server may apply other access criteria such as
  321          * client uid-->server uid mapping that we do not know about.
  322          */
  323         /* XXX Disable this for now; needs fixing of _access_otw() */
  324         if (0 && v3) {
  325                 if (ap->a_mode & VREAD)
  326                         mode = NFSV3ACCESS_READ;
  327                 else
  328                         mode = 0;
  329                 if (vp->v_type != VDIR) {
  330                         if (ap->a_mode & VWRITE)
  331                                 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
  332                         if (ap->a_mode & VEXEC)
  333                                 mode |= NFSV3ACCESS_EXECUTE;
  334                 } else {
  335                         if (ap->a_mode & VWRITE)
  336                                 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
  337                                     NFSV3ACCESS_DELETE);
  338                         if (ap->a_mode & VEXEC)
  339                                 mode |= NFSV3ACCESS_LOOKUP;
  340                 }
  341                 /* XXX safety belt, only make blanket request if caching */
  342                 if (nfs4_access_cache_timeout > 0) {
  343                         wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY |
  344                             NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE |
  345                             NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP;
  346                 } else {
  347                         wmode = mode;
  348                 }
  349 
  350                 /*
  351                  * Does our cached result allow us to give a definite yes to
  352                  * this request?
  353                  */
  354                 if (time_second < np->n_modestamp + nfs4_access_cache_timeout &&
  355                     ap->a_cred->cr_uid == np->n_modeuid &&
  356                     (np->n_mode & mode) == mode) {
  357                         nfsstats.accesscache_hits++;
  358                 } else {
  359                         /*
  360                          * Either a no, or a don't know.  Go to the wire.
  361                          */
  362                         nfsstats.accesscache_misses++;
  363                         error = nfs4_v3_access_otw(vp, wmode, ap->a_td,
  364                             ap->a_cred);
  365                         if (error == 0) {
  366                                 if ((np->n_mode & mode) != mode)
  367                                         error = EACCES;
  368                         }
  369                 }
  370                 return (error);
  371         }
  372 
  373         /* XXX use generic access code here? */
  374         mode = ap->a_mode & VREAD ? NFSV4ACCESS_READ : 0;
  375         if (vp->v_type == VDIR) {
  376                 if (ap->a_mode & VWRITE)
  377                         mode |= NFSV4ACCESS_MODIFY | NFSV4ACCESS_EXTEND | NFSV4ACCESS_DELETE;
  378                 if (ap->a_mode & VEXEC)
  379                         mode |= NFSV4ACCESS_LOOKUP;
  380         } else {
  381                 if (ap->a_mode & VWRITE)
  382                         mode |= NFSV4ACCESS_MODIFY | NFSV4ACCESS_EXTEND;
  383                 if (ap->a_mode & VEXEC)
  384                         mode |= NFSV4ACCESS_EXECUTE;
  385         }
  386 
  387         nfs_v4initcompound(&cp);
  388         acc.mode = mode;
  389 
  390         mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
  391         mb = mreq;
  392         bpos = mtod(mb, caddr_t);
  393 
  394         nfsm_v4build_compound(&cp, "nfs4_access()");
  395         nfsm_v4build_putfh(&cp, vp);
  396         nfsm_v4build_access(&cp, &acc);
  397         nfsm_v4build_finalize(&cp);
  398 
  399         nfsm_request(vp, NFSV4PROC_COMPOUND, td, cred);
  400         if (error != 0)
  401                 goto nfsmout;
  402 
  403         nfsm_v4dissect_compound(&cp);
  404         nfsm_v4dissect_putfh(&cp);
  405         nfsm_v4dissect_access(&cp, &acc);
  406 
  407         if ((acc.rmode & mode) != mode)
  408                 error = EACCES;
  409 
  410  nfsmout:
  411         error = nfs_v4postop(&cp, error);
  412 
  413         if (mrep != NULL)
  414                 m_freem(mrep);
  415 
  416         return (error);
  417 }
  418 
  419 static int
  420 nfs4_openrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
  421     int flags, struct vattr *vap)
  422 {
  423         struct vnode *vp = *vpp;
  424         struct nfs4_oparg_getattr getattr;
  425         struct nfs4_oparg_getfh getfh;
  426         struct nfs4_oparg_open opena;
  427         struct nfs4_compound cp;
  428         caddr_t bpos, dpos;
  429         int error = 0;
  430         struct mbuf *mreq, *mrep = NULL, *md, *mb;
  431         struct ucred *cred = cnp->cn_cred;
  432         struct thread *td = cnp->cn_thread;
  433         struct nfs4_fctx xfc, *fcp;
  434         struct nfsnode *np;
  435 
  436         if (vp == NULL) {
  437                 /* Create a new file */
  438                 np = NULL;
  439                 fcp = &xfc;
  440                 bzero(fcp, sizeof(*fcp));
  441         } else {
  442                 np = VTONFS(vp);
  443                 fcp = flags & FWRITE ? &np->n_wfc : &np->n_rfc;
  444         }
  445 
  446         /*
  447          * Since we are currently only one lockowner; we only open the
  448          * file once each for reading and writing.
  449          */
  450         if (fcp->refcnt++ != 0) {
  451                 *vpp = vp;
  452                 /*printf("not opening %s\n", np->n_name != NULL ? np->n_name : "");*/
  453                 return (0);
  454         }
  455 
  456         fcp->lop = &nfs4_masterlowner;
  457         fcp->np = np;
  458 
  459         nfs_v4initcompound(&cp);
  460         cp.nmp = VFSTONFS(dvp->v_mount);
  461 
  462         opena.ctype = NCLNULL;
  463         opena.flags = flags;
  464         opena.vap = vap;
  465         opena.fcp = fcp;                /* For lockowner */
  466         opena.cnp = cnp;
  467 
  468         getattr.bm = &nfsv4_getattrbm;
  469 
  470         mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
  471         mb = mreq;
  472         bpos = mtod(mb, caddr_t);
  473 
  474         nfsm_v4build_compound(&cp, "nfs4_openrpc()");
  475         nfsm_v4build_putfh(&cp, dvp);
  476         nfsm_v4build_open(&cp, &opena);
  477         nfsm_v4build_getattr(&cp, &getattr);
  478         nfsm_v4build_getfh(&cp, &getfh);
  479         nfsm_v4build_finalize(&cp);
  480 
  481         nfsm_request(vp != NULL ? vp : dvp, NFSV4PROC_COMPOUND, td, cred);
  482         if (error != 0)
  483                 goto nfsmout;
  484 
  485         nfsm_v4dissect_compound(&cp);
  486         nfsm_v4dissect_putfh(&cp);
  487         nfsm_v4dissect_open(&cp, &opena);
  488         nfsm_v4dissect_getattr(&cp, &getattr);
  489         nfsm_v4dissect_getfh(&cp, &getfh);
  490 
  491         error = nfs_v4postop(&cp, error);
  492 
  493         if (opena.rflags & NFSV4OPENRES_CONFIRM) {
  494                 error = nfs4_open_confirm(vp ? vp : dvp, &cp, &opena, &getfh, cred, td);
  495                 if (error != 0)
  496                         goto nfsmout;
  497         }
  498 
  499         if (vp == NULL) {
  500                 /* New file */
  501                 error = nfs_nget(dvp->v_mount, &getfh.fh_val,
  502                                  getfh.fh_len, &np, LK_EXCLUSIVE);
  503                 if (error != 0)
  504                         goto nfsmout;
  505 
  506                 vp = NFSTOV(np);
  507                 np->n_dvp = dvp;
  508                 np->n_namelen = cnp->cn_namelen; /* XXX memory leaks on these; track! */
  509                 if (np->n_name != NULL)
  510                         FREE(np->n_name, M_NFSREQ);
  511                 MALLOC(np->n_name, u_char *, np->n_namelen + 1, M_NFSREQ, M_WAITOK);
  512                 bcopy(cnp->cn_nameptr, np->n_name, np->n_namelen);
  513                 np->n_name[np->n_namelen] = '\0';
  514                 if (flags & FWRITE)
  515                         np->n_wfc = *fcp;
  516                 else
  517                         np->n_rfc = *fcp;
  518 
  519                 /*printf("opened new file %s\n", np->n_name);*/
  520 
  521                 nfs4_vnop_loadattrcache(vp, &getattr.fa, NULL);
  522                 *vpp = vp;
  523         } else {
  524                 /*printf("openend \"old\" %s\n", np->n_name != NULL ? np->n_name : "");*/
  525 
  526                 if (flags & O_TRUNC && np->n_size != 0) {
  527                         struct vattr va;
  528 
  529                         VATTR_NULL(&va);
  530                         va.va_size = 0;
  531                         error = nfs4_setattrrpc(vp, &va,
  532                             cnp->cn_cred, cnp->cn_thread);
  533                 }
  534                 np->n_attrstamp = 0;
  535         }
  536 
  537  nfsmout:
  538         if (mrep != NULL)
  539                 m_freem(mrep);
  540 
  541         return (error);
  542 }
  543 
  544 static int
  545 nfs4_open_confirm(struct vnode *vp, struct nfs4_compound *cpp,
  546     struct nfs4_oparg_open *openap, struct nfs4_oparg_getfh *gfh,
  547     struct ucred *cred, struct thread *td)
  548 {
  549         caddr_t bpos, dpos;
  550         int error = 0;
  551         struct mbuf *mreq, *mrep = NULL, *md, *mb;
  552 
  553         nfs_v4initcompound(cpp);
  554         cpp->nmp = VFSTONFS(vp->v_mount);
  555 
  556         mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
  557         mb = mreq;
  558         bpos = mtod(mb, caddr_t);
  559 
  560         nfsm_v4build_compound(cpp, "nfs4_open_confirm()");
  561         nfsm_v4build_putfh_nv(cpp, gfh);
  562         nfsm_v4build_open_confirm(cpp, openap);
  563         nfsm_v4build_finalize(cpp);
  564 
  565         nfsm_request(vp, NFSV4PROC_COMPOUND, td, cred);
  566         if (error != 0)
  567                 goto nfsmout;
  568 
  569         nfsm_v4dissect_compound(cpp);
  570         nfsm_v4dissect_putfh(cpp);
  571         nfsm_v4dissect_open_confirm(cpp, openap);
  572 
  573  nfsmout:
  574         error = nfs_v4postop(cpp, error);
  575 
  576         if (mrep != NULL)
  577                 m_freem(mrep);
  578 
  579         return (error);
  580 }
  581 
  582 
  583 /*
  584  * nfs open vnode op
  585  * Check to see if the type is ok
  586  * and that deletion is not in progress.
  587  * For paged in text files, you will need to flush the page cache
  588  * if consistency is lost.
  589  */
  590 /* ARGSUSED */
  591 static int
  592 nfs4_open(struct vop_open_args *ap)
  593 {
  594         struct vnode *vp = ap->a_vp;
  595         struct nfsnode *np = VTONFS(vp);
  596         enum vtype vtype = vp->v_type;
  597         int mode = ap->a_mode;
  598         struct componentname cn;
  599 
  600         if (vtype != VREG) {
  601                 if (vtype != VDIR && vtype != VLNK) {
  602 #ifdef DIAGNOSTIC
  603                         printf("open eacces vtyp=%d\n", vp->v_type);
  604 #endif
  605                         return (EACCES);
  606                 } else
  607                         return (0);
  608         }
  609 
  610         if (np->n_flag & NCREATED) {
  611                 np->n_flag &= ~NCREATED;
  612                 return (0);
  613         }
  614 
  615         cn.cn_nameptr = np->n_name;
  616         cn.cn_namelen = np->n_namelen;
  617         cn.cn_cred = ap->a_cred;
  618         cn.cn_thread = ap->a_td;
  619 
  620         return (nfs4_openrpc(np->n_dvp, &vp, &cn, mode, NULL));
  621 }
  622 
  623 static int
  624 nfs4_closerpc(struct vnode *vp, struct ucred *cred, struct thread *td, int flags)
  625 {
  626         caddr_t bpos, dpos;
  627         int error = 0;
  628         struct mbuf *mreq, *mrep = NULL, *md, *mb;
  629         struct nfs4_fctx *fcp;
  630         struct nfs4_compound cp;
  631         struct nfsnode *np = VTONFS(vp);
  632 
  633         fcp = flags & FWRITE ? &np->n_wfc : &np->n_rfc;
  634 
  635         nfs_v4initcompound(&cp);
  636 
  637         if (--fcp->refcnt != 0)
  638                 return (0);
  639 
  640         /*printf("closing %s\n", np->n_name != NULL ? np->n_name : "");*/
  641 
  642         cp.fcp = fcp;
  643 
  644         mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
  645         mb = mreq;
  646         bpos = mtod(mb, caddr_t);
  647 
  648         nfsm_v4build_compound(&cp, "nfs4_closerpc()");
  649         nfsm_v4build_putfh(&cp, vp);
  650         nfsm_v4build_close(&cp, fcp);
  651         nfsm_v4build_finalize(&cp);
  652 
  653         nfsm_request(vp, NFSV4PROC_COMPOUND, td, cred);
  654         if (error != 0)
  655                 goto nfsmout;
  656 
  657         nfsm_v4dissect_compound(&cp);
  658         nfsm_v4dissect_putfh(&cp);
  659         nfsm_v4dissect_close(&cp, fcp);
  660 
  661  nfsmout:
  662         error = nfs_v4postop(&cp, error);
  663 
  664         if (mrep != NULL)
  665                 m_freem(mrep);
  666 
  667         return (error);
  668 }
  669 
  670 /*
  671  * nfs close vnode op
  672  * play it safe for now (see comments in v2/v3 nfs_close regarding dirty buffers)
  673  */
  674 /* ARGSUSED */
  675 static int
  676 nfs4_close(struct vop_close_args *ap)
  677 {
  678         struct vnode *vp = ap->a_vp;
  679         struct nfsnode *np = VTONFS(vp);
  680         int error = 0;
  681 
  682         if (vp->v_type != VREG)
  683                 return (0);
  684 
  685         if (np->n_flag & NMODIFIED) {
  686                 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  687                 np->n_attrstamp = 0;
  688         }
  689 
  690         error = nfs4_closerpc(vp, ap->a_cred, ap->a_td, ap->a_fflag);
  691 
  692         if (!error && np->n_flag & NWRITEERR) {
  693                 np->n_flag &= ~NWRITEERR;
  694                 error = np->n_error;
  695         }
  696         return (error);
  697 }
  698 
  699 /*
  700  * nfs getattr call from vfs.
  701  */
  702 static int
  703 nfs4_getattr(struct vop_getattr_args *ap)
  704 {
  705         struct vnode *vp = ap->a_vp;
  706         struct nfsnode *np = VTONFS(vp);
  707         caddr_t bpos, dpos;
  708         int error = 0;
  709         struct mbuf *mreq, *mrep = NULL, *md, *mb;
  710         struct nfs4_oparg_getattr ga;
  711         struct nfs4_compound cp;
  712 
  713         /*
  714          * Update local times for special files.
  715          */
  716         if (np->n_flag & (NACC | NUPD))
  717                 np->n_flag |= NCHG;
  718         /*
  719          * First look in the cache.
  720          */
  721         if (nfs_getattrcache(vp, ap->a_vap) == 0)
  722                 return (0);
  723 
  724         nfsstats.rpccnt[NFSPROC_GETATTR]++;
  725 
  726         mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, NFSX_FH(1));
  727         mb = mreq;
  728         bpos = mtod(mb, caddr_t);
  729 
  730         ga.bm = &nfsv4_getattrbm;
  731         nfs_v4initcompound(&cp);
  732 
  733         nfsm_v4build_compound(&cp, "nfs4_getattr()");
  734         nfsm_v4build_putfh(&cp, vp);
  735         nfsm_v4build_getattr(&cp, &ga);
  736         nfsm_v4build_finalize(&cp);
  737 
  738         nfsm_request(vp, NFSV4PROC_COMPOUND, ap->a_td, ap->a_cred);
  739         if (error != 0)
  740                 goto nfsmout;
  741 
  742         nfsm_v4dissect_compound(&cp);
  743         nfsm_v4dissect_putfh(&cp);
  744         nfsm_v4dissect_getattr(&cp, &ga);
  745 
  746         nfs4_vnop_loadattrcache(vp, &ga.fa, ap->a_vap);
  747 
  748 nfsmout:
  749         error = nfs_v4postop(&cp, error);
  750 
  751         if (mrep != NULL)
  752                 m_freem(mrep);
  753         return (error);
  754 }
  755 
  756 /*
  757  * nfs setattr call.
  758  */
  759 static int
  760 nfs4_setattr(struct vop_setattr_args *ap)
  761 {
  762         struct vnode *vp = ap->a_vp;
  763         struct nfsnode *np = VTONFS(vp);
  764         struct vattr *vap = ap->a_vap;
  765         int error = 0;
  766         u_quad_t tsize;
  767 
  768 #ifndef nolint
  769         tsize = (u_quad_t)0;
  770 #endif
  771 
  772         /*
  773          * Setting of flags is not supported.
  774          */
  775         if (vap->va_flags != VNOVAL)
  776                 return (EOPNOTSUPP);
  777 
  778         /*
  779          * Disallow write attempts if the filesystem is mounted read-only.
  780          */
  781         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  782             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  783             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  784             (vp->v_mount->mnt_flag & MNT_RDONLY))
  785                 return (EROFS);
  786         if (vap->va_size != VNOVAL) {
  787                 switch (vp->v_type) {
  788                 case VDIR:
  789                         return (EISDIR);
  790                 case VCHR:
  791                 case VBLK:
  792                 case VSOCK:
  793                 case VFIFO:
  794                         if (vap->va_mtime.tv_sec == VNOVAL &&
  795                             vap->va_atime.tv_sec == VNOVAL &&
  796                             vap->va_mode == (mode_t)VNOVAL &&
  797                             vap->va_uid == (uid_t)VNOVAL &&
  798                             vap->va_gid == (gid_t)VNOVAL)
  799                                 return (0);
  800                         vap->va_size = VNOVAL;
  801                         break;
  802                 default:
  803                         /*
  804                          * Disallow write attempts if the filesystem is
  805                          * mounted read-only.
  806                          */
  807                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  808                                 return (EROFS);
  809 
  810                         /*
  811                          *  We run vnode_pager_setsize() early (why?),
  812                          * we must set np->n_size now to avoid vinvalbuf
  813                          * V_SAVE races that might setsize a lower
  814                          * value.
  815                          */
  816 
  817                         tsize = np->n_size;
  818                         error = nfs_meta_setsize(vp, ap->a_cred, 
  819                                                 ap->a_td, vap->va_size);
  820 
  821                         if (np->n_flag & NMODIFIED) {
  822                             if (vap->va_size == 0)
  823                                 error = nfs_vinvalbuf(vp, 0, ap->a_td, 1);
  824                             else
  825                                 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  826                             if (error) {
  827                                 vnode_pager_setsize(vp, np->n_size);
  828                                 return (error);
  829                             }
  830                         }
  831                         /*
  832                          * np->n_size has already been set to vap->va_size
  833                          * in nfs_meta_setsize(). We must set it again since
  834                          * nfs_loadattrcache() could be called through
  835                          * nfs_meta_setsize() and could modify np->n_size.
  836                          */
  837                         np->n_vattr.va_size = np->n_size = vap->va_size;
  838                 };
  839         } else if ((vap->va_mtime.tv_sec != VNOVAL ||
  840                 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) &&
  841                 vp->v_type == VREG &&
  842                 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) == EINTR)
  843                 return (error);
  844 
  845         if (vap->va_size != VNOVAL && np->n_wfc.refcnt == 0) {
  846                 /* Have to open the file before we can truncate it */
  847                 struct componentname cn;
  848 
  849                 cn.cn_nameptr = np->n_name;
  850                 cn.cn_namelen = np->n_namelen;
  851                 cn.cn_cred = ap->a_cred;
  852                 cn.cn_thread = ap->a_td;
  853                 error = nfs4_openrpc(np->n_dvp, &vp, &cn, FWRITE, NULL);
  854                 if (error)
  855                         return error;
  856                 np->n_flag |= NTRUNCATE;
  857         }
  858 
  859         error = nfs4_setattrrpc(vp, vap, ap->a_cred, ap->a_td);
  860         if (error && vap->va_size != VNOVAL) {
  861                 np->n_size = np->n_vattr.va_size = tsize;
  862                 vnode_pager_setsize(vp, np->n_size);
  863         }
  864         return (error);
  865 }
  866 
  867 /*
  868  * Do an nfs setattr rpc.
  869  */
  870 static int
  871 nfs4_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
  872     struct thread *td)
  873 {
  874         caddr_t bpos, dpos;
  875         int error = 0;
  876         struct mbuf *mreq, *mrep = NULL, *md, *mb;
  877         struct nfs4_compound cp;
  878         struct nfs4_oparg_getattr ga;
  879         struct nfsnode *np = VTONFS(vp);
  880         struct nfs4_fctx *fcp;
  881 
  882         nfsstats.rpccnt[NFSPROC_SETATTR]++;
  883         mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
  884         mb = mreq;
  885         bpos = mtod(mb, caddr_t);
  886 
  887         ga.bm = &nfsv4_getattrbm;
  888         fcp = (vap->va_size != VNOVAL) ? &np->n_wfc : NULL;
  889         nfs_v4initcompound(&cp);
  890 
  891         nfsm_v4build_compound(&cp, "nfs4_setattrrpc");
  892         nfsm_v4build_putfh(&cp, vp);
  893         nfsm_v4build_setattr(&cp, vap, fcp);
  894         nfsm_v4build_getattr(&cp, &ga);
  895         nfsm_v4build_finalize(&cp);
  896 
  897         nfsm_request(vp, NFSV4PROC_COMPOUND, td, cred);
  898         if (error != 0)
  899                 goto nfsmout;
  900 
  901         nfsm_v4dissect_compound(&cp);
  902         nfsm_v4dissect_putfh(&cp);
  903         nfsm_v4dissect_setattr(&cp);
  904         nfsm_v4dissect_getattr(&cp, &ga);
  905 
  906         nfs4_vnop_loadattrcache(vp, &ga.fa, NULL);
  907 
  908         /* TODO: do the settatr and close in a single compound rpc */
  909         if (np->n_flag & NTRUNCATE) {
  910                 error = nfs4_closerpc(vp, cred, td, FWRITE);
  911                 np->n_flag &= ~NTRUNCATE;
  912         }
  913 
  914 nfsmout:
  915         error = nfs_v4postop(&cp, error);
  916 
  917         if (mrep != NULL)
  918                 m_freem(mrep);
  919         
  920         return (error);
  921 }
  922 
  923 /*
  924  * nfs lookup call, one step at a time...
  925  * First look in cache
  926  * If not found, unlock the directory nfsnode and do the rpc
  927  */
  928 static int
  929 nfs4_lookup(struct vop_lookup_args *ap)
  930 {
  931         struct componentname *cnp = ap->a_cnp;
  932         struct vnode *dvp = ap->a_dvp;
  933         struct vnode **vpp = ap->a_vpp;
  934         int isdot, flags = cnp->cn_flags;
  935         struct vnode *newvp;
  936         struct nfsmount *nmp;
  937         caddr_t bpos, dpos;
  938         struct mbuf *mreq, *mrep = NULL, *md, *mb;
  939         long len;
  940         nfsfh_t *fhp;
  941         struct nfsnode *np;
  942         int error = 0, fhsize;
  943         struct thread *td = cnp->cn_thread;
  944         struct nfs4_compound cp;
  945         struct nfs4_oparg_getattr ga, dga;
  946         struct nfs4_oparg_lookup l;
  947         struct nfs4_oparg_getfh gfh;
  948 
  949         *vpp = NULLVP;
  950         if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
  951             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
  952                 return (EROFS);
  953         if (dvp->v_type != VDIR)
  954                 return (ENOTDIR);
  955         nmp = VFSTONFS(dvp->v_mount);
  956         np = VTONFS(dvp);
  957 
  958         isdot = cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.';
  959 
  960         if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) {
  961                 *vpp = NULLVP;
  962                 return (error);
  963         }
  964         if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) {
  965                 struct vattr vattr;
  966 
  967                 newvp = *vpp;
  968                 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td)
  969                  && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
  970                      nfsstats.lookupcache_hits++;
  971                      if (cnp->cn_nameiop != LOOKUP &&
  972                          (flags & ISLASTCN))
  973                              cnp->cn_flags |= SAVENAME;
  974                      return (0);
  975                 }
  976                 cache_purge(newvp);
  977                 if (newvp != dvp)
  978                         vput(newvp);
  979                 else
  980                         vrele(newvp);
  981         }
  982 
  983         error = 0;
  984         newvp = NULLVP;
  985         nfsstats.lookupcache_misses++;
  986         nfsstats.rpccnt[NFSPROC_LOOKUP]++;
  987 
  988         len = cnp->cn_namelen;
  989         mreq = nfsm_reqhead(NULL, NFSV4PROC_COMPOUND, 0);
  990         mb = mreq;
  991         bpos = mtod(mb, caddr_t);
  992 
  993         ga.bm = &nfsv4_getattrbm;
  994         dga.bm = &nfsv4_getattrbm;
  995         nfs_v4initcompound(&cp);
  996 
  997         nfsm_v4build_compound(&cp, "nfs4_lookup()");
  998         nfsm_v4build_putfh(&cp, dvp);
  999         nfsm_v4build_getattr(&cp, &dga);
 1000         if (flags & ISDOTDOT)
 1001                 nfsm_v4build_lookupp(&cp);
 1002         else if (!isdot) {
 1003                 l.name = cnp->cn_nameptr;
 1004                 l.namelen = len;
 1005                 nfsm_v4build_lookup(&cp, &l);
 1006         }
 1007         nfsm_v4build_getattr(&cp, &ga);
 1008         nfsm_v4build_getfh(&cp, &gfh);
 1009         nfsm_v4build_finalize(&cp);
 1010 
 1011         nfsm_request(dvp, NFSV4PROC_COMPOUND, cnp->cn_thread, cnp->cn_cred);
 1012         if (error != 0)
 1013                 goto nfsmout;
 1014 
 1015         nfsm_v4dissect_compound(&cp);
 1016         nfsm_v4dissect_putfh(&cp);
 1017         nfsm_v4dissect_getattr(&cp, &dga);
 1018         if (flags & ISDOTDOT)
 1019                 nfsm_v4dissect_lookupp(&cp);
 1020         else if (!isdot)
 1021                 nfsm_v4dissect_lookup(&cp);
 1022         nfsm_v4dissect_getattr(&cp, &ga);
 1023         nfsm_v4dissect_getfh(&cp, &gfh);
 1024 
 1025         nfs4_vnop_loadattrcache(dvp, &dga.fa, NULL);
 1026         fhp = &gfh.fh_val;
 1027         fhsize = gfh.fh_len;
 1028 
 1029         /*
 1030          * Handle RENAME case...
 1031          */
 1032         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 1033                 if (NFS_CMPFH(np, fhp, fhsize))
 1034                         return (EISDIR);
 1035 
 1036                 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, LK_EXCLUSIVE);
 1037                 if (error)
 1038                         return (error);
 1039 
 1040                 newvp = NFSTOV(np);
 1041 
 1042                 nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
 1043 
 1044                 *vpp = newvp;
 1045                 cnp->cn_flags |= SAVENAME;
 1046                 return (0);
 1047         }
 1048 
 1049         if (flags & ISDOTDOT) {
 1050                 VOP_UNLOCK(dvp, 0, td);
 1051 
 1052                 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, LK_EXCLUSIVE);
 1053                 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
 1054                 if (error)
 1055                         return (error);
 1056                 newvp = NFSTOV(np);
 1057 
 1058                 nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
 1059         } else if (NFS_CMPFH(np, fhp, fhsize)) {
 1060                 VREF(dvp);
 1061                 newvp = dvp;
 1062         } else {
 1063                 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, LK_EXCLUSIVE);
 1064                 if (error)
 1065                         return (error);
 1066                 newvp = NFSTOV(np);
 1067 
 1068                 /* Fill in np used by open. */
 1069                 np->n_dvp = dvp;
 1070                 np->n_namelen = cnp->cn_namelen;
 1071                 if (np->n_name != NULL)
 1072                         FREE(np->n_name, M_NFSREQ);
 1073                 MALLOC(np->n_name, u_char *, np->n_namelen + 1, M_NFSREQ, M_WAITOK);
 1074                 bcopy(cnp->cn_nameptr, np->n_name, np->n_namelen);
 1075                 np->n_name[np->n_namelen] = '\0';
 1076 
 1077                 nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
 1078         }
 1079 
 1080         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1081                 cnp->cn_flags |= SAVENAME;
 1082         if ((cnp->cn_flags & MAKEENTRY) &&
 1083             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
 1084                 np->n_ctime = np->n_vattr.va_ctime.tv_sec;
 1085                 cache_enter(dvp, newvp, cnp);
 1086         }
 1087         *vpp = newvp;
 1088         m_freem(mrep);
 1089 nfsmout:
 1090         error = nfs_v4postop(&cp, error);
 1091 
 1092         if (error) {
 1093                 if (newvp != NULLVP) {
 1094                         vrele(newvp);
 1095                         *vpp = NULLVP;
 1096                 }
 1097                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 1098                     (flags & ISLASTCN) && error == ENOENT) {
 1099                         if (dvp->v_mount->mnt_flag & MNT_RDONLY)
 1100                                 error = EROFS;
 1101                         else
 1102                                 error = EJUSTRETURN;
 1103                 }
 1104                 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1105                         cnp->cn_flags |= SAVENAME;
 1106         }
 1107 
 1108         return (error);
 1109 }
 1110 
 1111 /*
 1112  * nfs read call.
 1113  * Just call nfs_bioread() to do the work.
 1114  */
 1115 static int
 1116 nfs4_read(struct vop_read_args *ap)
 1117 {
 1118         struct vnode *vp = ap->a_vp;
 1119 
 1120         switch (vp->v_type) {
 1121         case VREG:
 1122                 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1123         case VDIR:
 1124                 return (EISDIR);
 1125         default:
 1126                 return (EOPNOTSUPP);
 1127         }
 1128 }
 1129 
 1130 /*
 1131  * nfs readlink call
 1132  */
 1133 static int
 1134 nfs4_readlink(struct vop_readlink_args *ap)
 1135 {
 1136         struct vnode *vp = ap->a_vp;
 1137 
 1138         if (vp->v_type != VLNK)
 1139                 return (EINVAL);
 1140         return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1141 }
 1142 
 1143 /*
 1144  * Do a readlink rpc.
 1145  * Called by nfs_doio() from below the buffer cache.
 1146  */
 1147 int
 1148 nfs4_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1149 {
 1150         caddr_t bpos, dpos;
 1151         int error = 0;
 1152         struct mbuf *mreq, *mrep = NULL, *md, *mb;
 1153         struct nfs4_compound cp;
 1154 
 1155         nfsstats.rpccnt[NFSPROC_READLINK]++;
 1156 
 1157         mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
 1158         mb = mreq;
 1159         bpos = mtod(mb, caddr_t);
 1160 
 1161         nfs_v4initcompound(&cp);
 1162 
 1163         nfsm_v4build_compound(&cp, "nfs4_readlinkrpc()");
 1164         nfsm_v4build_putfh(&cp, vp);
 1165         nfsm_v4build_readlink(&cp);
 1166         nfsm_v4build_finalize(&cp);
 1167 
 1168         nfsm_request(vp, NFSV4PROC_COMPOUND, uiop->uio_td, cred);
 1169         if (error != 0)
 1170                 goto nfsmout;
 1171 
 1172         nfsm_v4dissect_compound(&cp);
 1173         nfsm_v4dissect_putfh(&cp);
 1174         nfsm_v4dissect_readlink(&cp, uiop);
 1175 
 1176 nfsmout:
 1177         error = nfs_v4postop(&cp, error);
 1178 
 1179         if (mrep != NULL)
 1180                 m_freem(mrep);
 1181         return (error);
 1182 }
 1183 
 1184 /*
 1185  * nfs read rpc call
 1186  * Ditto above
 1187  */
 1188 int
 1189 nfs4_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1190 {
 1191         caddr_t bpos, dpos;
 1192         struct mbuf *mreq, *mrep = NULL, *md, *mb;
 1193         struct nfsmount *nmp;
 1194         int error = 0, len, tsiz;
 1195         struct nfs4_compound cp;
 1196         struct nfs4_oparg_read read;
 1197         struct nfsnode *np = VTONFS(vp);
 1198 
 1199         nmp = VFSTONFS(vp->v_mount);
 1200         tsiz = uiop->uio_resid;
 1201         if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
 1202                 return (EFBIG);
 1203 
 1204         if (tsiz == 0)
 1205                 return (0);
 1206 
 1207         read.uiop = uiop;
 1208         read.fcp = np->n_rfc.refcnt > 0 ? &np->n_rfc : &np->n_wfc;
 1209 
 1210         while (tsiz > 0) {
 1211                 nfsstats.rpccnt[NFSPROC_READ]++;
 1212                 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz;
 1213 
 1214                 read.off = uiop->uio_offset;
 1215                 read.maxcnt = len;
 1216                 nfs_v4initcompound(&cp);
 1217 
 1218                 mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
 1219                 mb = mreq;
 1220                 bpos = mtod(mb, caddr_t);
 1221 
 1222                 nfsm_v4build_compound(&cp, "nfs4_readrpc()");
 1223                 nfsm_v4build_putfh(&cp, vp);
 1224                 nfsm_v4build_read(&cp, &read);
 1225                 nfsm_v4build_finalize(&cp);
 1226 
 1227                 nfsm_request(vp, NFSV4PROC_COMPOUND, uiop->uio_td, cred);
 1228                 if (error != 0) {
 1229                         error = nfs_v4postop(&cp, error);
 1230                         goto nfsmout;
 1231                 }
 1232 
 1233                 nfsm_v4dissect_compound(&cp);
 1234                 nfsm_v4dissect_putfh(&cp);
 1235                 nfsm_v4dissect_read(&cp, &read);
 1236 
 1237                 if (read.eof || read.retlen == 0)
 1238                         tsiz = 0;
 1239                 else
 1240                         tsiz -= read.retlen;
 1241 
 1242                 error = nfs_v4postop(&cp, error);
 1243 
 1244                 m_freem(mrep);
 1245                 mrep = NULL;
 1246         }
 1247 nfsmout:
 1248         if (mrep != NULL)
 1249                 m_freem(mrep);
 1250         
 1251         return (error);
 1252 }
 1253 
 1254 /*
 1255  * nfs write call
 1256  */
 1257 int
 1258 nfs4_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1259     int *iomode, int *must_commit)
 1260 {
 1261         int32_t backup;
 1262         caddr_t bpos, dpos;
 1263         struct mbuf *mreq, *mrep = NULL, *md, *mb;
 1264         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 1265         int error = 0, len, tsiz, wccflag = 1, rlen;
 1266         struct nfs4_compound cp;
 1267         struct nfs4_oparg_write write;
 1268         nfsv4stablehow commit, committed = NSHFILESYNC;
 1269         caddr_t verf;
 1270         struct nfsnode *np = VTONFS(vp);
 1271 
 1272 #ifndef DIAGNOSTIC
 1273         if (uiop->uio_iovcnt != 1)
 1274                 panic("nfs: writerpc iovcnt > 1");
 1275 #endif
 1276         *must_commit = 0;
 1277         tsiz = uiop->uio_resid;
 1278         if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
 1279                 return (EFBIG);
 1280 
 1281         if (tsiz == 0)
 1282                 return (0);
 1283 
 1284         write.stable = (nfsv4stablehow)*iomode;
 1285         write.uiop = uiop;
 1286         write.fcp = &np->n_wfc;
 1287 
 1288         while (tsiz > 0) {
 1289                 nfsstats.rpccnt[NFSPROC_WRITE]++;
 1290                 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz;
 1291 
 1292                 write.off = uiop->uio_offset;
 1293                 write.cnt = len;
 1294                 nfs_v4initcompound(&cp);
 1295 
 1296                 mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
 1297                 mb = mreq;
 1298                 bpos = mtod(mb, caddr_t);
 1299 
 1300                 nfsm_v4build_compound(&cp, "nfs4_writerpc()");
 1301                 nfsm_v4build_putfh(&cp, vp);
 1302                 nfsm_v4build_write(&cp, &write);
 1303                 nfsm_v4build_finalize(&cp);
 1304 
 1305                 nfsm_request(vp, NFSV4PROC_COMPOUND, uiop->uio_td, cred);
 1306                 if (error != 0) {
 1307                         error = nfs_v4postop(&cp, error);
 1308                         goto nfsmout;
 1309                 }
 1310 
 1311                 nfsm_v4dissect_compound(&cp);
 1312                 nfsm_v4dissect_putfh(&cp);
 1313                 nfsm_v4dissect_write(&cp, &write);
 1314 
 1315                 rlen = write.retlen;
 1316                 if (rlen == 0) {
 1317                         error = NFSERR_IO;
 1318                         break;
 1319                 } else if (rlen < len) {
 1320                         backup = len - rlen;
 1321                         uiop->uio_iov->iov_base =
 1322                             (char *)uiop->uio_iov->iov_base -  backup;
 1323                         uiop->uio_iov->iov_len += backup;
 1324                         uiop->uio_offset -= backup;
 1325                         uiop->uio_resid += backup;
 1326                         len = rlen;
 1327                 }
 1328 
 1329                 commit = write.committed;
 1330 
 1331                 if (committed == NSHFILESYNC ||
 1332                     (committed = NSHDATASYNC && commit == NSHUNSTABLE))
 1333                         committed = commit;
 1334 
 1335                 verf = (caddr_t)write.wverf;
 1336 
 1337                 if ((nmp->nm_flag & NFSSTA_HASWRITEVERF) == 0) {
 1338                         bcopy(verf, nmp->nm_verf, NFSX_V4VERF);
 1339                         nmp->nm_flag |= NFSMNT_HASWRITEVERF;
 1340                 } else if (bcmp(verf, nmp->nm_verf, NFSX_V4VERF)) {
 1341                         *must_commit = 1;
 1342                         bcopy(verf, nmp->nm_verf, NFSX_V4VERF);
 1343                 }
 1344 
 1345                 /* XXX wccflag */
 1346                 if (wccflag)
 1347                         VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime;
 1348 
 1349                 error = nfs_v4postop(&cp, error);
 1350 
 1351                 m_freem(mrep);
 1352                 mrep = NULL;
 1353                 if (error)
 1354                         break;
 1355                 tsiz -= len;
 1356         }
 1357 nfsmout:
 1358         if (mrep != NULL)
 1359                 m_freem(mrep);
 1360         *iomode = committed;
 1361         if (error)
 1362                 uiop->uio_resid = tsiz;
 1363         return (error);
 1364 }
 1365 
 1366 /* ARGSUSED */
 1367 static int
 1368 nfs4_mknod(struct vop_mknod_args *ap)
 1369 {
 1370         struct vattr *vap = ap->a_vap;
 1371         struct vnode *newvp = NULL;
 1372         int error;
 1373 
 1374         error = nfs4_createrpc(ap->a_dvp, &newvp,
 1375             ap->a_cnp, (nfstype)vap->va_type, vap, NULL);
 1376 
 1377         /* XXX - is this actually referenced here? */
 1378         if (error == 0) {
 1379                 *ap->a_vpp = newvp;
 1380                 vrele(newvp);
 1381         }
 1382 
 1383         return (error);
 1384 }
 1385 
 1386 static int
 1387 nfs4_createrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1388     nfstype ftype, struct vattr *vap, char *linktarget)
 1389 {
 1390         struct nfsnode *dnp = VTONFS(dvp);
 1391         struct nfsnode *np = NULL;
 1392         struct vnode *newvp = NULL;
 1393         struct nfs4_compound cp;
 1394         struct nfs4_oparg_create c;
 1395         struct nfs4_oparg_getattr ga;
 1396         struct nfs4_oparg_getfh gfh;
 1397         caddr_t bpos, dpos;
 1398         struct mbuf *mreq, *mrep = NULL, *md, *mb;
 1399         int error = 0;
 1400 
 1401         nfsstats.rpccnt[NFSPROC_CREATE]++;
 1402 
 1403         mreq = nfsm_reqhead(dvp, NFSV4PROC_COMPOUND, 0);
 1404         mb = mreq;
 1405         bpos = mtod(mb, caddr_t);
 1406 
 1407         bzero(&c, sizeof(c));
 1408         bzero(&ga, sizeof(ga));
 1409 
 1410         c.type = ftype;
 1411         c.vap = vap;
 1412         c.linktext = linktarget;
 1413         c.name = cnp->cn_nameptr;
 1414         c.namelen = cnp->cn_namelen;
 1415 
 1416         ga.bm = &nfsv4_getattrbm;
 1417         nfs_v4initcompound(&cp);
 1418 
 1419         nfsm_v4build_compound(&cp, "nfs4_createrpc()");
 1420         nfsm_v4build_putfh(&cp, dvp);
 1421         nfsm_v4build_create(&cp, &c);
 1422         nfsm_v4build_getattr(&cp, &ga);
 1423         nfsm_v4build_getfh(&cp, &gfh);  
 1424         nfsm_v4build_finalize(&cp); 
 1425 
 1426         nfsm_request(dvp, NFSV4PROC_COMPOUND, cnp->cn_thread, cnp->cn_cred);
 1427         if (error != 0)
 1428                 goto nfsmout;
 1429 
 1430         nfsm_v4dissect_compound(&cp);
 1431         nfsm_v4dissect_putfh(&cp);
 1432         nfsm_v4dissect_create(&cp, &c);
 1433         nfsm_v4dissect_getattr(&cp, &ga);
 1434         nfsm_v4dissect_getfh(&cp, &gfh);        
 1435         
 1436         error = nfs_nget(dvp->v_mount, &gfh.fh_val, gfh.fh_len, &np, LK_EXCLUSIVE);
 1437         if (error != 0)
 1438                 goto nfsmout;
 1439 
 1440         newvp = NFSTOV(np);
 1441         nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
 1442 
 1443         if (cnp->cn_flags & MAKEENTRY)
 1444                 cache_enter(dvp, newvp, cnp);
 1445 
 1446         dnp->n_flag |= NMODIFIED;
 1447         dnp->n_attrstamp = 0;
 1448 
 1449  nfsmout:
 1450         error = nfs_v4postop(&cp, error);
 1451 
 1452         if (mrep != NULL)
 1453                 m_freem(mrep);
 1454 
 1455         /* XXX */
 1456         /*FREE(cnp->cn_pnbuf, M_NAMEI);*/
 1457         if (error != 0 && newvp != NULL)
 1458                 vput(newvp);
 1459         else if (error == 0)
 1460                 *vpp = newvp;
 1461 
 1462         return (error);
 1463 }
 1464 
 1465 static int
 1466 nfs4_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen,
 1467     struct vnode *tdvp, const char *tnameptr, int tnamelen,
 1468     struct ucred *cred, struct thread *td)
 1469 {
 1470 
 1471         struct nfsnode *fnp = VTONFS(fdvp), *tnp = VTONFS(tdvp);
 1472         caddr_t bpos, dpos;
 1473         struct mbuf *mreq, *mrep = NULL, *md, *mb;
 1474         struct nfs4_compound cp;
 1475         struct nfs4_oparg_rename r;
 1476         int error = 0;
 1477 
 1478         nfsstats.rpccnt[NFSPROC_RENAME]++;
 1479 
 1480         r.fname = fnameptr;
 1481         r.fnamelen = fnamelen;
 1482         r.tname = tnameptr;
 1483         r.tnamelen = tnamelen;
 1484         nfs_v4initcompound(&cp);
 1485 
 1486         mreq = nfsm_reqhead(fdvp, NFSV4PROC_COMPOUND, 0);
 1487         mb = mreq;
 1488         bpos = mtod(mb, caddr_t);
 1489 
 1490         nfsm_v4build_compound(&cp, "nfs4_renamerpc()");
 1491         nfsm_v4build_putfh(&cp, fdvp);
 1492         nfsm_v4build_savefh(&cp);
 1493         nfsm_v4build_putfh(&cp, tdvp);
 1494         nfsm_v4build_rename(&cp, &r);
 1495         nfsm_v4build_finalize(&cp);
 1496 
 1497         nfsm_request(fdvp, NFSV4PROC_COMPOUND, td, cred);
 1498         if (error != 0)
 1499                 goto nfsmout;
 1500 
 1501         nfsm_v4dissect_compound(&cp);
 1502         nfsm_v4dissect_putfh(&cp);
 1503         nfsm_v4dissect_savefh(&cp);
 1504         nfsm_v4dissect_putfh(&cp);
 1505         nfsm_v4dissect_rename(&cp);
 1506 
 1507         /* XXX should this always be performed?  */
 1508         fnp->n_flag |= NMODIFIED;
 1509         tnp->n_flag |= NMODIFIED;
 1510         fnp->n_attrstamp = tnp->n_attrstamp = 0;
 1511 
 1512  nfsmout:
 1513         error = nfs_v4postop(&cp, error);
 1514 
 1515         if (mrep != NULL)
 1516                 m_freem(mrep);
 1517 
 1518         return (error);
 1519 }
 1520 
 1521 /*
 1522  * nfs file create call
 1523  */
 1524 static int
 1525 nfs4_create(struct vop_create_args *ap)
 1526 {
 1527         struct vnode *dvp = ap->a_dvp;
 1528         struct vattr *vap = ap->a_vap;
 1529         struct nfsnode *dnp = VTONFS(dvp);
 1530         struct componentname *cnp = ap->a_cnp;
 1531         struct vnode *newvp = NULL;
 1532         int error = 0, fmode = (O_CREAT | FREAD | FWRITE);
 1533         struct vattr vattr;
 1534 
 1535         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0)
 1536                 return (error);
 1537 
 1538         if (vap->va_vaflags & VA_EXCLUSIVE)
 1539                 fmode |= O_EXCL;
 1540 
 1541         error = nfs4_openrpc(dvp, &newvp, cnp, fmode, vap);
 1542         if (error != 0)
 1543                 goto out;
 1544 
 1545         VTONFS(newvp)->n_flag |= NCREATED;
 1546 
 1547         if (cnp->cn_flags & MAKEENTRY)
 1548                 cache_enter(dvp, newvp, cnp);
 1549 
 1550         *ap->a_vpp = newvp;
 1551 
 1552         dnp->n_flag |= NMODIFIED;
 1553         dnp->n_attrstamp = 0;   /* XXX; wccflag */
 1554 
 1555  out:
 1556         return (error);
 1557 }
 1558 
 1559 /*
 1560  * nfs file remove call
 1561  * To try and make nfs semantics closer to ufs semantics, a file that has
 1562  * other processes using the vnode is renamed instead of removed and then
 1563  * removed later on the last close.
 1564  * - If v_usecount > 1
 1565  *        If a rename is not already in the works
 1566  *           call nfs4_sillyrename() to set it up
 1567  *     else
 1568  *        do the remove rpc
 1569  */
 1570 static int
 1571 nfs4_remove(struct vop_remove_args *ap)
 1572 {
 1573         struct vnode *vp = ap->a_vp;
 1574         struct vnode *dvp = ap->a_dvp;
 1575         struct componentname *cnp = ap->a_cnp;
 1576         struct nfsnode *np = VTONFS(vp);
 1577         int error = 0;
 1578         struct vattr vattr;
 1579 
 1580 #ifndef DIAGNOSTIC
 1581         if ((cnp->cn_flags & HASBUF) == 0)
 1582                 panic("nfs4_remove: no name");
 1583         if (vrefcnt(vp) < 1)
 1584                 panic("nfs4_remove: bad v_usecount");
 1585 #endif
 1586         if (vp->v_type == VDIR)
 1587                 error = EPERM;
 1588         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1589             VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_thread) == 0 &&
 1590             vattr.va_nlink > 1)) {
 1591                 /*
 1592                  * Purge the name cache so that the chance of a lookup for
 1593                  * the name succeeding while the remove is in progress is
 1594                  * minimized. Without node locking it can still happen, such
 1595                  * that an I/O op returns ESTALE, but since you get this if
 1596                  * another host removes the file..
 1597                  */
 1598                 cache_purge(vp);
 1599                 /*
 1600                  * throw away biocache buffers, mainly to avoid
 1601                  * unnecessary delayed writes later.
 1602                  */
 1603                 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1604                 /* Do the rpc */
 1605                 if (error != EINTR)
 1606                         error = nfs4_removerpc(dvp, cnp->cn_nameptr,
 1607                                 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1608                 /*
 1609                  * Kludge City: If the first reply to the remove rpc is lost..
 1610                  *   the reply to the retransmitted request will be ENOENT
 1611                  *   since the file was in fact removed
 1612                  *   Therefore, we cheat and return success.
 1613                  */
 1614                 if (error == ENOENT)
 1615                         error = 0;
 1616         } else if (!np->n_sillyrename)
 1617                 error = nfs4_sillyrename(dvp, vp, cnp);
 1618         np->n_attrstamp = 0;
 1619         return (error);
 1620 }
 1621 
 1622 /*
 1623  * nfs file remove rpc called from nfs_inactive
 1624  */
 1625 int
 1626 nfs4_removeit(struct sillyrename *sp)
 1627 {
 1628         /*
 1629          * Make sure that the directory vnode is still valid.
 1630          * XXX we should lock sp->s_dvp here.
 1631          */
 1632         if (sp->s_dvp->v_type == VBAD)
 1633                 return (0);
 1634         return (nfs4_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 1635                 NULL));
 1636 }
 1637 
 1638 /*
 1639  * Nfs remove rpc, called from nfs4_remove() and nfs4_removeit().
 1640  */
 1641 static int
 1642 nfs4_removerpc(struct vnode *dvp, const char *name, int namelen,
 1643     struct ucred *cred, struct thread *td)
 1644 {
 1645         caddr_t bpos, dpos;
 1646         int error = 0;
 1647         struct mbuf *mreq, *mrep = NULL, *md, *mb;
 1648         struct nfs4_compound cp;
 1649 
 1650         nfsstats.rpccnt[NFSPROC_REMOVE]++;
 1651 
 1652         mreq = nfsm_reqhead(dvp, NFSV4PROC_COMPOUND, 0);
 1653         mb = mreq;
 1654         bpos = mtod(mb, caddr_t);
 1655 
 1656         nfs_v4initcompound(&cp);
 1657 
 1658         nfsm_v4build_compound(&cp, "nfs4_removerpc()");
 1659         nfsm_v4build_putfh(&cp, dvp);
 1660         nfsm_v4build_remove(&cp, name, namelen);
 1661         nfsm_v4build_finalize(&cp);
 1662 
 1663         nfsm_request(dvp, NFSV4PROC_COMPOUND, td, cred);
 1664         if (error != 0)
 1665                 goto nfsmout;
 1666 
 1667         nfsm_v4dissect_compound(&cp);
 1668         nfsm_v4dissect_putfh(&cp);
 1669         nfsm_v4dissect_remove(&cp);
 1670 
 1671  nfsmout:
 1672         error = nfs_v4postop(&cp, error);
 1673 
 1674         if (mrep != NULL)
 1675                 m_freem(mrep);
 1676 
 1677         VTONFS(dvp)->n_flag |= NMODIFIED;
 1678         VTONFS(dvp)->n_attrstamp = 0; /* XXX wccflag */
 1679 
 1680         return (error);
 1681 }
 1682 
 1683 /*
 1684  * nfs file rename call
 1685  */
 1686 static int
 1687 nfs4_rename(struct vop_rename_args *ap)
 1688 {
 1689         struct vnode *fvp = ap->a_fvp;
 1690         struct vnode *tvp = ap->a_tvp;
 1691         struct vnode *fdvp = ap->a_fdvp;
 1692         struct vnode *tdvp = ap->a_tdvp;
 1693         struct componentname *tcnp = ap->a_tcnp;
 1694         struct componentname *fcnp = ap->a_fcnp;
 1695         int error;
 1696 
 1697  #ifndef DIAGNOSTIC
 1698         if ((tcnp->cn_flags & HASBUF) == 0 ||
 1699             (fcnp->cn_flags & HASBUF) == 0)
 1700                 panic("nfs4_rename: no name");
 1701 #endif
 1702         /* Check for cross-device rename */
 1703         if ((fvp->v_mount != tdvp->v_mount) ||
 1704             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1705                 error = EXDEV;
 1706                 goto out;
 1707         }
 1708 
 1709         if (fvp == tvp) {
 1710                 printf("nfs4_rename: fvp == tvp (can't happen)\n");
 1711                 error = 0;
 1712                 goto out;
 1713         }
 1714         if ((error = vn_lock(fvp, LK_EXCLUSIVE, fcnp->cn_thread)) != 0)
 1715                 goto out;
 1716 
 1717         /*
 1718          * We have to flush B_DELWRI data prior to renaming
 1719          * the file.  If we don't, the delayed-write buffers
 1720          * can be flushed out later after the file has gone stale
 1721          * under NFSV3.  NFSV2 does not have this problem because
 1722          * ( as far as I can tell ) it flushes dirty buffers more
 1723          * often.
 1724          */
 1725         VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1726         VOP_UNLOCK(fvp, 0, fcnp->cn_thread);
 1727         if (tvp)
 1728             VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1729 
 1730         /*
 1731          * If the tvp exists and is in use, sillyrename it before doing the
 1732          * rename of the new file over it.
 1733          * XXX Can't sillyrename a directory.
 1734          */
 1735         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1736                 tvp->v_type != VDIR && !nfs4_sillyrename(tdvp, tvp, tcnp)) {
 1737                 vput(tvp);
 1738                 tvp = NULL;
 1739         }
 1740 
 1741         error = nfs4_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1742                 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1743                 tcnp->cn_thread);
 1744 
 1745         if (fvp->v_type == VDIR) {
 1746                 if (tvp != NULL && tvp->v_type == VDIR)
 1747                         cache_purge(tdvp);
 1748                 cache_purge(fdvp);
 1749         }
 1750 
 1751 out:
 1752         if (tdvp == tvp)
 1753                 vrele(tdvp);
 1754         else
 1755                 vput(tdvp);
 1756         if (tvp)
 1757                 vput(tvp);
 1758         vrele(fdvp);
 1759         vrele(fvp);
 1760         /*
 1761          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1762          */
 1763         if (error == ENOENT)
 1764                 error = 0;
 1765         return (error);
 1766 }
 1767 
 1768 /*
 1769  * nfs file rename rpc called from nfs4_remove() above
 1770  */
 1771 static int
 1772 nfs4_renameit(struct vnode *sdvp, struct componentname *scnp,
 1773     struct sillyrename *sp)
 1774 {
 1775         return (nfs4_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp,
 1776             sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread));
 1777 }
 1778 
 1779 /*
 1780  * nfs hard link create call
 1781  */
 1782 static int
 1783 nfs4_link(struct vop_link_args *ap)
 1784 {
 1785         struct vnode *vp = ap->a_vp;
 1786         struct vnode *tdvp = ap->a_tdvp;
 1787         struct componentname *cnp = ap->a_cnp;
 1788         caddr_t bpos, dpos;
 1789         int error = 0;
 1790         struct mbuf *mreq, *mrep = NULL, *md, *mb;
 1791         struct nfs4_compound cp;
 1792         struct nfs4_oparg_link l;
 1793 
 1794         if (vp->v_mount != tdvp->v_mount) {
 1795                 return (EXDEV);
 1796         }
 1797 
 1798         /*
 1799          * Push all writes to the server, so that the attribute cache
 1800          * doesn't get "out of sync" with the server.
 1801          * XXX There should be a better way!
 1802          */
 1803         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 1804 
 1805         nfsstats.rpccnt[NFSPROC_LINK]++;
 1806 
 1807         l.name = cnp->cn_nameptr;
 1808         l.namelen = cnp->cn_namelen;
 1809         nfs_v4initcompound(&cp);
 1810 
 1811         mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
 1812         mb = mreq;
 1813         bpos = mtod(mb, caddr_t);
 1814 
 1815         nfsm_v4build_compound(&cp, "nfs4_link()");
 1816         nfsm_v4build_putfh(&cp, vp);
 1817         nfsm_v4build_savefh(&cp);
 1818         nfsm_v4build_putfh(&cp, tdvp);
 1819         nfsm_v4build_link(&cp, &l);
 1820         nfsm_v4build_finalize(&cp);
 1821 
 1822         nfsm_request(vp, NFSV4PROC_COMPOUND, cnp->cn_thread, cnp->cn_cred);
 1823         if (error != 0)
 1824                 goto nfsmout;
 1825 
 1826         nfsm_v4dissect_compound(&cp);
 1827         nfsm_v4dissect_putfh(&cp);
 1828         nfsm_v4dissect_savefh(&cp);
 1829         nfsm_v4dissect_putfh(&cp);
 1830         nfsm_v4dissect_link(&cp);
 1831 
 1832         VTONFS(tdvp)->n_flag |= NMODIFIED;
 1833         VTONFS(vp)->n_attrstamp = 0;
 1834         VTONFS(tdvp)->n_attrstamp = 0;
 1835 
 1836 nfsmout:
 1837         error = nfs_v4postop(&cp, error);
 1838 
 1839         if (mrep != NULL)
 1840                 m_freem(mrep);
 1841 
 1842         return (error);
 1843 }
 1844 
 1845 /*
 1846  * nfs symbolic link create call
 1847  */
 1848 static int
 1849 nfs4_symlink(struct vop_symlink_args *ap)
 1850 {
 1851         struct vnode *dvp = ap->a_dvp;
 1852         int error = 0;
 1853         struct vnode *newvp = NULL;
 1854 
 1855         nfsstats.rpccnt[NFSPROC_SYMLINK]++;
 1856 
 1857         error = nfs4_createrpc(ap->a_dvp, &newvp, ap->a_cnp, NFLNK,
 1858             ap->a_vap, ap->a_target);
 1859 
 1860         if (error != 0 && newvp != NULL)
 1861                 vput(newvp);
 1862         else if (error == 0)
 1863                  *ap->a_vpp = newvp;
 1864 
 1865         VTONFS(dvp)->n_flag |= NMODIFIED;
 1866         VTONFS(dvp)->n_attrstamp = 0; /* XXX wccflags */
 1867 
 1868         return (error);
 1869 }
 1870 
 1871 /*
 1872  * nfs make dir call
 1873  */
 1874 static int
 1875 nfs4_mkdir(struct vop_mkdir_args *ap)
 1876 {
 1877         return (nfs4_createrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, NFDIR,
 1878                     ap->a_vap, NULL));
 1879 }
 1880 
 1881 /*
 1882  * nfs remove directory call
 1883  */
 1884 static int
 1885 nfs4_rmdir(struct vop_rmdir_args *ap)
 1886 {
 1887         struct vnode *vp = ap->a_vp;
 1888         struct vnode *dvp = ap->a_dvp;
 1889         struct nfsnode *dnp = VTONFS(dvp);
 1890         struct componentname *cnp = ap->a_cnp;
 1891         int error = 0;
 1892 
 1893         if (dvp == vp)
 1894                 return (EINVAL);
 1895 
 1896         error = (nfs4_removerpc(dvp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_cred,
 1897                                NULL));
 1898         if (error)
 1899                 return (error);
 1900 
 1901         dnp->n_flag |= NMODIFIED;
 1902         dnp->n_attrstamp = 0;
 1903         cache_purge(dvp);
 1904         cache_purge(vp);
 1905 
 1906         return (error);
 1907 }
 1908 
 1909 /*
 1910  * nfs readdir call
 1911  */
 1912 static int
 1913 nfs4_readdir(struct vop_readdir_args *ap)
 1914 {
 1915         struct vnode *vp = ap->a_vp;
 1916         struct nfsnode *np = VTONFS(vp);
 1917         struct uio *uio = ap->a_uio;
 1918         int tresid, error;
 1919         struct vattr vattr;
 1920 
 1921         if (vp->v_type != VDIR)
 1922                 return (EPERM);
 1923         /*
 1924          * First, check for hit on the EOF offset cache
 1925          */
 1926         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 1927             (np->n_flag & NMODIFIED) == 0) {
 1928                 if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_td) == 0 &&
 1929                         !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 1930                         nfsstats.direofcache_hits++;
 1931                         return (0);
 1932                 }
 1933         }
 1934 
 1935         /*
 1936          * Call nfs_bioread() to do the real work.
 1937          */
 1938         tresid = uio->uio_resid;
 1939         error = nfs_bioread(vp, uio, 0, ap->a_cred);
 1940 
 1941         if (!error && uio->uio_resid == tresid)
 1942                 nfsstats.direofcache_misses++;
 1943         return (error);
 1944 }
 1945 
 1946 static u_char fty_to_dty[] = {
 1947         DT_UNKNOWN,             /* NFNON */
 1948         DT_REG,                 /* NFREG */
 1949         DT_DIR,                 /* NFDIR */
 1950         DT_BLK,                 /* NFBLK */
 1951         DT_CHR,                 /* NFCHR */
 1952         DT_LNK,                 /* NFLNK */
 1953         DT_SOCK,                /* NFSOCK */
 1954         DT_FIFO,                /* NFFIFO */
 1955         DT_UNKNOWN,             /* NFATTRDIT */
 1956         DT_UNKNOWN,             /* NFNAMEDATTR */
 1957         DT_UNKNOWN,             /* NFBAD */
 1958 };
 1959 
 1960 /*
 1961  * Readdir rpc call.
 1962  * Called from below the buffer cache by nfs_doio().
 1963  */
 1964 int
 1965 nfs4_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1966 {
 1967         int len, left;
 1968         struct dirent *dp = NULL;
 1969         u_int32_t *tl;
 1970         caddr_t p;
 1971         uint64_t *cookiep;
 1972         caddr_t bpos, dpos;
 1973         struct mbuf *mreq, *mrep = NULL, *md, *mb;
 1974         uint64_t cookie;
 1975         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 1976         struct nfsnode *dnp = VTONFS(vp);
 1977         int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1;
 1978         struct nfs4_compound cp;
 1979         struct nfs4_oparg_readdir readdir;
 1980         struct nfsv4_fattr fattr;
 1981         u_int fty;
 1982 
 1983 #ifndef DIAGNOSTIC
 1984         if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
 1985                 (uiop->uio_resid & (DIRBLKSIZ - 1)))
 1986                 panic("nfs readdirrpc bad uio");
 1987 #endif
 1988 
 1989         /*
 1990          * If there is no cookie, assume directory was stale.
 1991          */
 1992         cookiep = nfs4_getcookie(dnp, uiop->uio_offset, 0);
 1993         if (cookiep)
 1994                 cookie = *cookiep;
 1995         else
 1996                 return (NFSERR_BAD_COOKIE);
 1997 
 1998         /* Generate fake entries for "." and ".." */
 1999         while (cookie < 2 && bigenough) {
 2000                 cookie++;
 2001                 len = 4 + DIRHDSIZ;
 2002 
 2003                 if (len > uiop->uio_resid) {
 2004                         bigenough = 0;
 2005                         break;
 2006                 }
 2007                 dp = (struct dirent *)uiop->uio_iov->iov_base;
 2008 
 2009                 dp->d_namlen = cookie;
 2010                 dp->d_reclen = len;
 2011                 dp->d_type = DT_DIR;
 2012                 if (cookie == 1)
 2013                         dp->d_fileno = dnp->n_vattr.va_fileid; /* XXX has problems with pynfs virtualhandles */
 2014                 else
 2015                         dp->d_fileno = dnp->n_dvp != NULL ?
 2016                             VTONFS(dnp->n_dvp)->n_vattr.va_fileid : cookie;
 2017 
 2018                 p = dp->d_name;
 2019                 *p++ = '.';
 2020                 if (cookie == 2)
 2021                         *p++ = '.';
 2022                 *p = '\0';
 2023 
 2024                 blksiz += len;
 2025                 if (blksiz == DIRBLKSIZ)
 2026                         blksiz = 0;
 2027                 uiop->uio_offset += len;
 2028                 uiop->uio_resid -= len;
 2029                 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + len;
 2030                 uiop->uio_iov->iov_len -= len;
 2031         }
 2032 
 2033         if (cookie == 2)
 2034                 cookie = 0;
 2035 
 2036         /* This is sort of ugly, to prevent v4postop() from acting weird */
 2037         bzero(&cp, sizeof(cp));
 2038 
 2039         /*
 2040          * Loop around doing readdir rpc's of size nm_readdirsize
 2041          * truncated to a multiple of DIRBLKSIZ.
 2042          * The stopping criteria is EOF or buffer full.
 2043          */
 2044         /*
 2045          * XXX this is sort of ugly for nfsv4; we don't maintain the
 2046          * strict abstraction, but do the decoding inline.  that's ok.
 2047          */
 2048         while (more_dirs && bigenough) {
 2049                 nfsstats.rpccnt[NFSPROC_READDIR]++;
 2050 
 2051                 mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
 2052                 mb = mreq;
 2053                 bpos = mtod(mb, caddr_t);
 2054 
 2055                 readdir.cnt = nmp->nm_readdirsize;
 2056                 readdir.cookie = cookie;
 2057                 readdir.bm = &nfsv4_readdirbm;
 2058                 if (cookie == 0)
 2059                         bzero(&readdir.verf, sizeof(readdir.verf));
 2060                 else
 2061                         bcopy(&dnp->n_cookieverf, &readdir.verf,
 2062                             sizeof(readdir.verf));
 2063 
 2064                 nfs_v4initcompound(&cp);
 2065 
 2066                 nfsm_v4build_compound(&cp, "nfs4_readdirrpc()");
 2067                 nfsm_v4build_putfh(&cp, vp);
 2068                 nfsm_v4build_readdir(&cp, &readdir);
 2069                 nfsm_v4build_finalize(&cp);
 2070 
 2071                 nfsm_request(vp, NFSV4PROC_COMPOUND, uiop->uio_td, cred);
 2072                 if (error != 0)
 2073                         goto nfsmout;
 2074 
 2075                 nfsm_v4dissect_compound(&cp);
 2076                 nfsm_v4dissect_putfh(&cp);
 2077 
 2078                 /*
 2079                  * XXX - Readdir gets handled inline like in
 2080                  * NFSv{2,3}.  This is a nasty inconsistency and
 2081                  * should be fixed.
 2082                  */
 2083 
 2084                 tl = nfsm_dissect(uint32_t *, 5 * NFSX_UNSIGNED);
 2085                 if (fxdr_unsigned(uint32_t, *tl++) != NFSV4OP_READDIR) {
 2086                         error = EBADRPC;
 2087                         goto nfsmout;
 2088                 }
 2089                 if (fxdr_unsigned(uint32_t, *tl++) != 0) {
 2090                         error = EBADRPC;
 2091                         goto nfsmout;
 2092                 }
 2093 
 2094                 bcopy(tl, &dnp->n_cookieverf, NFSX_V4VERF);
 2095                 tl += 2;
 2096                 more_dirs = fxdr_unsigned(int, *tl++);
 2097 
 2098                 /* loop thru the dir entries, doctoring them to 4bsd form */
 2099                 while (more_dirs && bigenough) {
 2100                         tl = nfsm_dissect(uint32_t *, 3 * NFSX_UNSIGNED);
 2101                         cookie = fxdr_hyper(tl);
 2102                         tl += 2;
 2103                         /* XXX cookie sanity check */
 2104                         len = fxdr_unsigned(int, *tl++);
 2105                         if (len <= 0 || len > NFS_MAXNAMLEN) {
 2106                                 error = EBADRPC;
 2107                                 goto nfsmout;
 2108                         }
 2109                         tlen = nfsm_rndup(len);
 2110                         if (tlen == len)
 2111                                 tlen += 4;      /* To ensure null termination */
 2112                         left = DIRBLKSIZ - blksiz;
 2113                         if ((tlen + DIRHDSIZ) > left) {
 2114                                 dp->d_reclen += left;
 2115                                 uiop->uio_iov->iov_base =
 2116                                     (char *)uiop->uio_iov->iov_base + left;
 2117                                 uiop->uio_iov->iov_len -= left;
 2118                                 uiop->uio_offset += left;
 2119                                 uiop->uio_resid -= left;
 2120                                 blksiz = 0;
 2121                         }
 2122                         if ((tlen + DIRHDSIZ) > uiop->uio_resid)
 2123                                 bigenough = 0;
 2124                         if (bigenough) {
 2125                                 dp = (struct dirent *)uiop->uio_iov->iov_base;
 2126 
 2127                                 dp->d_namlen = len;
 2128                                 dp->d_reclen = tlen + DIRHDSIZ;
 2129 
 2130                                 blksiz += dp->d_reclen;
 2131                                 if (blksiz == DIRBLKSIZ)
 2132                                         blksiz = 0;
 2133                                 uiop->uio_offset += DIRHDSIZ;
 2134                                 uiop->uio_resid -= DIRHDSIZ;
 2135                                 uiop->uio_iov->iov_base =
 2136                                     (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
 2137                                 uiop->uio_iov->iov_len -= DIRHDSIZ;
 2138 
 2139                                 /* Copy name */
 2140                                 nfsm_mtouio(uiop, len);
 2141                                 p = uiop->uio_iov->iov_base;
 2142                                 tlen -= len;
 2143                                 *p = '\0';      /* null terminate */
 2144                                 /* printf("nfs4_readdirrpc: name: \"%s\" cookie %d\n",
 2145                                    p - len, (int) cookie);*/
 2146                                 uiop->uio_iov->iov_base =
 2147                                     (char *)uiop->uio_iov->iov_base + tlen;
 2148                                 uiop->uio_iov->iov_len -= tlen;
 2149                                 uiop->uio_offset += tlen;
 2150                                 uiop->uio_resid -= tlen;
 2151 
 2152                                 /* Copy attributes */
 2153                                 nfsm_v4dissect_attrs(&fattr);
 2154 
 2155                                 dp->d_fileno = nfs_v4fileid4_to_fileid(
 2156                                         fattr.fa4_valid & FA4V_FILEID &&
 2157                                             fattr.fa4_fileid ?
 2158                                             fattr.fa4_fileid : cookie);
 2159 
 2160                                 fty = (u_int)fattr.fa4_type;
 2161                                 dp->d_type = fattr.fa4_valid & FA4V_TYPE &&
 2162                                     (fty < sizeof(fty_to_dty)) ?
 2163                                     fty_to_dty[fty] : DT_UNKNOWN;
 2164                         } else
 2165                                 nfsm_adv(nfsm_rndup(len));
 2166 
 2167                         tl = nfsm_dissect(uint32_t *, NFSX_UNSIGNED);
 2168                         more_dirs = fxdr_unsigned(int, *tl++);
 2169                 }
 2170                 /*
 2171                  * If at end of rpc data, get the eof boolean
 2172                  */
 2173                 if (!more_dirs) {
 2174                         tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2175                         more_dirs = (fxdr_unsigned(int, *tl) == 0);
 2176                 }
 2177 
 2178                 error = nfs_v4postop(&cp, error);
 2179 
 2180                 m_freem(mrep);
 2181                 mrep = NULL;
 2182         }
 2183         /*
 2184          * Fill last record, iff any, out to a multiple of DIRBLKSIZ
 2185          * by increasing d_reclen for the last record.
 2186          */
 2187         if (blksiz > 0) {
 2188                 left = DIRBLKSIZ - blksiz;
 2189                 dp->d_reclen += left;
 2190                 uiop->uio_iov->iov_base =
 2191                     (char *)uiop->uio_iov->iov_base + left;
 2192                 uiop->uio_iov->iov_len -= left;
 2193                 uiop->uio_offset += left;
 2194                 uiop->uio_resid -= left;
 2195         }
 2196 
 2197         /*
 2198          * We are now either at the end of the directory or have filled the
 2199          * block.
 2200          */
 2201         if (bigenough)
 2202                 dnp->n_direofoffset = uiop->uio_offset;
 2203         else {
 2204                 if (uiop->uio_resid > 0)
 2205                         printf("EEK! readdirrpc resid > 0\n");
 2206                 cookiep = nfs4_getcookie(dnp, uiop->uio_offset, 1);
 2207                 *cookiep = cookie;
 2208         }
 2209 nfsmout:
 2210         if (mrep != NULL)
 2211                 m_freem(mrep);
 2212         return (error);
 2213 }
 2214 
 2215 /*
 2216  * Silly rename. To make the NFS filesystem that is stateless look a little
 2217  * more like the "ufs" a remove of an active vnode is translated to a rename
 2218  * to a funny looking filename that is removed by nfs_inactive on the
 2219  * nfsnode. There is the potential for another process on a different client
 2220  * to create the same funny name between the nfs_lookitup() fails and the
 2221  * nfs_rename() completes, but...
 2222  */
 2223 static int
 2224 nfs4_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2225 {
 2226         struct sillyrename *sp;
 2227         struct nfsnode *np;
 2228         int error;
 2229         short pid;
 2230 
 2231         cache_purge(dvp);
 2232         np = VTONFS(vp);
 2233 #ifndef DIAGNOSTIC
 2234         if (vp->v_type == VDIR)
 2235                 panic("nfs: sillyrename dir");
 2236 #endif
 2237         MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
 2238                 M_NFSREQ, M_WAITOK);
 2239         sp->s_cred = crhold(cnp->cn_cred);
 2240         sp->s_dvp = dvp;
 2241         sp->s_removeit = nfs4_removeit;
 2242         VREF(dvp);
 2243 
 2244         /* Fudge together a funny name */
 2245         pid = cnp->cn_thread->td_proc->p_pid;
 2246         sp->s_namlen = sprintf(sp->s_name, ".nfsA%04x4.4", pid);
 2247 
 2248         /* Try lookitups until we get one that isn't there */
 2249         while (nfs4_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2250                 cnp->cn_thread, NULL) == 0) {
 2251                 sp->s_name[4]++;
 2252                 if (sp->s_name[4] > 'z') {
 2253                         error = EINVAL;
 2254                         goto bad;
 2255                 }
 2256         }
 2257         error = nfs4_renameit(dvp, cnp, sp);
 2258         if (error)
 2259                 goto bad;
 2260         error = nfs4_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2261                 cnp->cn_thread, &np);
 2262         np->n_sillyrename = sp;
 2263         return (0);
 2264 bad:
 2265         vrele(sp->s_dvp);
 2266         crfree(sp->s_cred);
 2267         free((caddr_t)sp, M_NFSREQ);
 2268         return (error);
 2269 }
 2270 
 2271 /*
 2272  * Look up a file name and optionally either update the file handle or
 2273  * allocate an nfsnode, depending on the value of npp.
 2274  * npp == NULL  --> just do the lookup
 2275  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2276  *                      handled too
 2277  * *npp != NULL --> update the file handle in the vnode
 2278  */
 2279 static int
 2280 nfs4_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred,
 2281     struct thread *td, struct nfsnode **npp)
 2282 {
 2283         struct vnode *newvp = NULL;
 2284         struct nfsnode *np, *dnp = VTONFS(dvp);
 2285         caddr_t bpos, dpos;
 2286         int error = 0, fhlen;
 2287         struct mbuf *mreq, *mrep = NULL, *md, *mb;
 2288         nfsfh_t *nfhp;
 2289         struct nfs4_compound cp;
 2290         struct nfs4_oparg_lookup l;
 2291         struct nfs4_oparg_getfh gfh;
 2292         struct nfs4_oparg_getattr ga;
 2293 
 2294         nfsstats.rpccnt[NFSPROC_RENAME]++;
 2295 
 2296         mreq = nfsm_reqhead(dvp, NFSV4PROC_COMPOUND, 0);
 2297         mb = mreq;
 2298         bpos = mtod(mb, caddr_t);
 2299 
 2300         l.name = name;
 2301         l.namelen = len;
 2302 
 2303         nfs_v4initcompound(&cp);
 2304 
 2305         ga.bm = &nfsv4_getattrbm;
 2306 
 2307         nfsm_v4build_compound(&cp, "nfs4_renamerpc()");
 2308         nfsm_v4build_putfh(&cp, dvp);
 2309         nfsm_v4build_lookup(&cp, &l);
 2310         nfsm_v4build_getfh(&cp, &gfh);
 2311         nfsm_v4build_getattr(&cp, &ga);
 2312 
 2313         nfsm_request(dvp, NFSV4PROC_COMPOUND, td, cred);
 2314         if (error != 0)
 2315                 goto nfsmout;
 2316 
 2317         nfsm_v4dissect_compound(&cp);
 2318         nfsm_v4dissect_putfh(&cp);
 2319         nfsm_v4dissect_lookup(&cp);
 2320         nfsm_v4dissect_getfh(&cp, &gfh);
 2321         nfsm_v4dissect_getattr(&cp, &ga);
 2322 
 2323         if (npp != NULL && error == 0) {
 2324                 nfhp = &gfh.fh_val;
 2325                 fhlen = gfh.fh_len;
 2326 
 2327                 if (*npp != NULL) {
 2328                         np = *npp;
 2329                         if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) {
 2330                                 free((caddr_t)np->n_fhp, M_NFSBIGFH);
 2331                                 np->n_fhp = &np->n_fh;
 2332                         } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH)
 2333                                 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK);
 2334                         bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen);
 2335                         np->n_fhsize = fhlen;
 2336                         newvp = NFSTOV(np);
 2337                 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
 2338                         VREF(dvp);
 2339                         newvp = dvp;
 2340                 } else {
 2341                         error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE);
 2342                         if (error) {
 2343                                 m_freem(mrep);
 2344                                 return (error);
 2345                         }
 2346                         newvp = NFSTOV(np);
 2347                 }
 2348 
 2349                 if (newvp != dvp) {
 2350                         np->n_dvp = dvp;
 2351                         np->n_namelen = len;
 2352                         if (np->n_name != NULL)
 2353                                 FREE(np->n_name, M_NFSREQ);
 2354                         MALLOC(np->n_name, u_char *,
 2355                             np->n_namelen + 1, M_NFSREQ, M_WAITOK);
 2356                         memcpy(np->n_name, name, len);
 2357                         np->n_name[len] = '\0';
 2358                 }
 2359                 nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
 2360         }
 2361 
 2362 nfsmout:
 2363         error = nfs_v4postop(&cp, error);
 2364 
 2365         if (mrep != NULL)
 2366                 m_freem(mrep);
 2367         if (npp && *npp == NULL) {
 2368                 if (error) {
 2369                         if (newvp) {
 2370                                 if (newvp == dvp)
 2371                                         vrele(newvp);
 2372                                 else
 2373                                         vput(newvp);
 2374                         }
 2375                 } else
 2376                         *npp = np;
 2377         }
 2378 
 2379 
 2380         return (error);
 2381 }
 2382 
 2383 /*
 2384  * Nfs Version 3 commit rpc
 2385  */
 2386 int
 2387 nfs4_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2388     struct thread *td)
 2389 {
 2390         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2391         caddr_t bpos, dpos;
 2392         int error = 0;
 2393         struct mbuf *mreq, *mrep = NULL, *md, *mb;
 2394         struct nfs4_compound cp;
 2395         struct nfs4_oparg_commit commit;
 2396 
 2397         if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0)
 2398                 return (0);
 2399         nfsstats.rpccnt[NFSPROC_COMMIT]++;
 2400 
 2401         mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
 2402         mb = mreq;
 2403         bpos = mtod(mb, caddr_t);
 2404 
 2405         commit.start = offset;
 2406         commit.len = cnt;
 2407 
 2408         nfs_v4initcompound(&cp);
 2409 
 2410         nfsm_v4build_compound(&cp, "nfs4_commit()");
 2411         nfsm_v4build_putfh(&cp, vp);
 2412         nfsm_v4build_commit(&cp, &commit);
 2413         nfsm_v4build_finalize(&cp);
 2414 
 2415         nfsm_request(vp, NFSV4PROC_COMPOUND, td, cred);
 2416         if (error != 0)
 2417                 goto nfsmout;
 2418 
 2419         nfsm_v4dissect_compound(&cp);
 2420         nfsm_v4dissect_putfh(&cp);
 2421         nfsm_v4dissect_commit(&cp, &commit);
 2422         
 2423         /* XXX */
 2424         /* nfsm_wcc_data(vp, wccflag);*/
 2425         if (bcmp(nmp->nm_verf, commit.verf, NFSX_V4VERF)) {
 2426                 bcopy(commit.verf, nmp->nm_verf, NFSX_V4VERF);
 2427                 error = NFSERR_STALEWRITEVERF;
 2428         }
 2429 
 2430 nfsmout:
 2431         error = nfs_v4postop(&cp, error);
 2432 
 2433         if (mrep == NULL)
 2434                 m_freem(mrep);
 2435         return (error);
 2436 }
 2437 
 2438 /*
 2439  * Strategy routine.
 2440  * For async requests when nfsiod(s) are running, queue the request by
 2441  * calling nfs_asyncio(), otherwise just all nfs_doio() to do the
 2442  * request.
 2443  */
 2444 static int
 2445 nfs4_strategy(struct vop_strategy_args *ap)
 2446 {
 2447         struct buf *bp = ap->a_bp;
 2448         struct ucred *cr;
 2449         int error = 0;
 2450 
 2451         KASSERT(!(bp->b_flags & B_DONE), ("nfs4_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2452         KASSERT(BUF_REFCNT(bp) > 0, ("nfs4_strategy: buffer %p not locked", bp));
 2453 
 2454         if (bp->b_iocmd == BIO_READ)
 2455                 cr = bp->b_rcred;
 2456         else
 2457                 cr = bp->b_wcred;
 2458 
 2459         /*
 2460          * If the op is asynchronous and an i/o daemon is waiting
 2461          * queue the request, wake it up and wait for completion
 2462          * otherwise just do it ourselves.
 2463          */
 2464         if ((bp->b_flags & B_ASYNC) == 0 ||
 2465                 nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
 2466                 error = nfs_doio(ap->a_vp, bp, cr, curthread);
 2467         return (error);
 2468 }
 2469 
 2470 /*
 2471  * fsync vnode op. Just call nfs4_flush() with commit == 1.
 2472  */
 2473 /* ARGSUSED */
 2474 static int
 2475 nfs4_fsync(struct vop_fsync_args *ap)
 2476 {
 2477         return (nfs4_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1));
 2478 }
 2479 
 2480 /*
 2481  * Flush all the blocks associated with a vnode.
 2482  *      Walk through the buffer pool and push any dirty pages
 2483  *      associated with the vnode.
 2484  */
 2485 static int
 2486 nfs4_flush(struct vnode *vp, int waitfor, struct thread *td,
 2487     int commit)
 2488 {
 2489         struct nfsnode *np = VTONFS(vp);
 2490         struct buf *bp;
 2491         int i;
 2492         struct buf *nbp;
 2493         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2494         int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2495         int passone = 1;
 2496         u_quad_t off, endoff, toff;
 2497         struct ucred* wcred = NULL;
 2498         struct buf **bvec = NULL;
 2499 #ifndef NFS_COMMITBVECSIZ
 2500 #define NFS_COMMITBVECSIZ       20
 2501 #endif
 2502         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2503         int bvecsize = 0, bveccount;
 2504 
 2505         if (nmp->nm_flag & NFSMNT_INT)
 2506                 slpflag = PCATCH;
 2507         if (!commit)
 2508                 passone = 0;
 2509         /*
 2510          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2511          * server, but nas not been committed to stable storage on the server
 2512          * yet. On the first pass, the byte range is worked out and the commit
 2513          * rpc is done. On the second pass, nfs_writebp() is called to do the
 2514          * job.
 2515          */
 2516 again:
 2517         off = (u_quad_t)-1;
 2518         endoff = 0;
 2519         bvecpos = 0;
 2520         if (NFS_ISV3(vp) && commit) {
 2521                 s = splbio();
 2522                 if (bvec != NULL && bvec != bvec_on_stack)
 2523                         free(bvec, M_TEMP);
 2524                 /*
 2525                  * Count up how many buffers waiting for a commit.
 2526                  */
 2527                 bveccount = 0;
 2528                 VI_LOCK(vp);
 2529                 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
 2530                         if (BUF_REFCNT(bp) == 0 &&
 2531                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2532                                 == (B_DELWRI | B_NEEDCOMMIT))
 2533                                 bveccount++;
 2534                 }
 2535                 /*
 2536                  * Allocate space to remember the list of bufs to commit.  It is
 2537                  * important to use M_NOWAIT here to avoid a race with nfs4_write.
 2538                  * If we can't get memory (for whatever reason), we will end up
 2539                  * committing the buffers one-by-one in the loop below.
 2540                  */
 2541                 if (bveccount > NFS_COMMITBVECSIZ) {
 2542                         /*
 2543                          * Release the vnode interlock to avoid a lock
 2544                          * order reversal.
 2545                          */
 2546                         VI_UNLOCK(vp);
 2547                         bvec = (struct buf **)
 2548                                 malloc(bveccount * sizeof(struct buf *),
 2549                                        M_TEMP, M_NOWAIT);
 2550                         VI_LOCK(vp);
 2551                         if (bvec == NULL) {
 2552                                 bvec = bvec_on_stack;
 2553                                 bvecsize = NFS_COMMITBVECSIZ;
 2554                         } else
 2555                                 bvecsize = bveccount;
 2556                 } else {
 2557                         bvec = bvec_on_stack;
 2558                         bvecsize = NFS_COMMITBVECSIZ;
 2559                 }
 2560                 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
 2561                         if (bvecpos >= bvecsize)
 2562                                 break;
 2563                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2564                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2565                                 continue;
 2566                         }
 2567                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2568                             (B_DELWRI | B_NEEDCOMMIT)) {
 2569                                 BUF_UNLOCK(bp);
 2570                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 2571                                 continue;
 2572                         }
 2573                         VI_UNLOCK(vp);
 2574                         bremfree(bp);
 2575                         /*
 2576                          * Work out if all buffers are using the same cred
 2577                          * so we can deal with them all with one commit.
 2578                          *
 2579                          * NOTE: we are not clearing B_DONE here, so we have
 2580                          * to do it later on in this routine if we intend to
 2581                          * initiate I/O on the bp.
 2582                          *
 2583                          * Note: to avoid loopback deadlocks, we do not
 2584                          * assign b_runningbufspace.
 2585                          */
 2586                         if (wcred == NULL)
 2587                                 wcred = bp->b_wcred;
 2588                         else if (wcred != bp->b_wcred)
 2589                                 wcred = NOCRED;
 2590                         vfs_busy_pages(bp, 1);
 2591 
 2592                         VI_LOCK(vp);
 2593                         /*
 2594                          * bp is protected by being locked, but nbp is not
 2595                          * and vfs_busy_pages() may sleep.  We have to
 2596                          * recalculate nbp.
 2597                          */
 2598                         nbp = TAILQ_NEXT(bp, b_bobufs);
 2599 
 2600                         /*
 2601                          * A list of these buffers is kept so that the
 2602                          * second loop knows which buffers have actually
 2603                          * been committed. This is necessary, since there
 2604                          * may be a race between the commit rpc and new
 2605                          * uncommitted writes on the file.
 2606                          */
 2607                         bvec[bvecpos++] = bp;
 2608                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2609                                 bp->b_dirtyoff;
 2610                         if (toff < off)
 2611                                 off = toff;
 2612                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2613                         if (toff > endoff)
 2614                                 endoff = toff;
 2615                 }
 2616                 splx(s);
 2617                 VI_UNLOCK(vp);
 2618         }
 2619         if (bvecpos > 0) {
 2620                 /*
 2621                  * Commit data on the server, as required.
 2622                  * If all bufs are using the same wcred, then use that with
 2623                  * one call for all of them, otherwise commit each one
 2624                  * separately.
 2625                  */
 2626                 if (wcred != NOCRED)
 2627                         retv = nfs4_commit(vp, off, (int)(endoff - off),
 2628                                           wcred, td);
 2629                 else {
 2630                         retv = 0;
 2631                         for (i = 0; i < bvecpos; i++) {
 2632                                 off_t off, size;
 2633                                 bp = bvec[i];
 2634                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2635                                         bp->b_dirtyoff;
 2636                                 size = (u_quad_t)(bp->b_dirtyend
 2637                                                   - bp->b_dirtyoff);
 2638                                 retv = nfs4_commit(vp, off, (int)size,
 2639                                                   bp->b_wcred, td);
 2640                                 if (retv) break;
 2641                         }
 2642                 }
 2643 
 2644                 if (retv == NFSERR_STALEWRITEVERF)
 2645                         nfs_clearcommit(vp->v_mount);
 2646 
 2647                 /*
 2648                  * Now, either mark the blocks I/O done or mark the
 2649                  * blocks dirty, depending on whether the commit
 2650                  * succeeded.
 2651                  */
 2652                 for (i = 0; i < bvecpos; i++) {
 2653                         bp = bvec[i];
 2654                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 2655                         if (retv) {
 2656                                 /*
 2657                                  * Error, leave B_DELWRI intact
 2658                                  */
 2659                                 vfs_unbusy_pages(bp);
 2660                                 brelse(bp);
 2661                         } else {
 2662                                 /*
 2663                                  * Success, remove B_DELWRI ( bundirty() ).
 2664                                  *
 2665                                  * b_dirtyoff/b_dirtyend seem to be NFS
 2666                                  * specific.  We should probably move that
 2667                                  * into bundirty(). XXX
 2668                                  */
 2669                                 s = splbio();
 2670                                 bufobj_wref(&vp->v_bufobj);
 2671                                 bp->b_flags |= B_ASYNC;
 2672                                 bundirty(bp);
 2673                                 bp->b_flags &= ~B_DONE;
 2674                                 bp->b_ioflags &= ~BIO_ERROR;
 2675                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2676                                 splx(s);
 2677                                 bufdone(bp);
 2678                         }
 2679                 }
 2680         }
 2681 
 2682         /*
 2683          * Start/do any write(s) that are required.
 2684          */
 2685 loop:
 2686         s = splbio();
 2687         VI_LOCK(vp);
 2688         TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
 2689                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 2690                         if (waitfor != MNT_WAIT || passone)
 2691                                 continue;
 2692 
 2693                         error = BUF_TIMELOCK(bp,
 2694                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 2695                             VI_MTX(vp), "nfsfsync", slpflag, slptimeo);
 2696                         splx(s);
 2697                         if (error == 0)
 2698                                 panic("nfs4_fsync: inconsistent lock");
 2699                         if (error == ENOLCK)
 2700                                 goto loop;
 2701                         if (nfs4_sigintr(nmp, NULL, td)) {
 2702                                 error = EINTR;
 2703                                 goto done;
 2704                         }
 2705                         if (slpflag == PCATCH) {
 2706                                 slpflag = 0;
 2707                                 slptimeo = 2 * hz;
 2708                         }
 2709                         goto loop;
 2710                 }
 2711                 if ((bp->b_flags & B_DELWRI) == 0)
 2712                         panic("nfs4_fsync: not dirty");
 2713                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 2714                         BUF_UNLOCK(bp);
 2715                         continue;
 2716                 }
 2717                 VI_UNLOCK(vp);
 2718                 bremfree(bp);
 2719                 if (passone || !commit)
 2720                     bp->b_flags |= B_ASYNC;
 2721                 else
 2722                     bp->b_flags |= B_ASYNC;
 2723                 splx(s);
 2724                 bwrite(bp);
 2725                 goto loop;
 2726         }
 2727         splx(s);
 2728         if (passone) {
 2729                 passone = 0;
 2730                 VI_UNLOCK(vp);
 2731                 goto again;
 2732         }
 2733         if (waitfor == MNT_WAIT) {
 2734                 while (vp->v_bufobj.bo_numoutput) {
 2735                         error = bufobj_wwait(&vp->v_bufobj, slpflag, slptimeo);
 2736                         if (error) {
 2737                             VI_UNLOCK(vp);
 2738                             if (nfs4_sigintr(nmp, NULL, td)) {
 2739                                 error = EINTR;
 2740                                 goto done;
 2741                             }
 2742                             if (slpflag == PCATCH) {
 2743                                 slpflag = 0;
 2744                                 slptimeo = 2 * hz;
 2745                             }
 2746                             VI_LOCK(vp);
 2747                         }
 2748                 }
 2749                 if (vp->v_bufobj.bo_dirty.bv_cnt > 0 && commit) {
 2750                         VI_UNLOCK(vp);
 2751                         goto loop;
 2752                 }
 2753         }
 2754         VI_UNLOCK(vp);
 2755         if (np->n_flag & NWRITEERR) {
 2756                 error = np->n_error;
 2757                 np->n_flag &= ~NWRITEERR;
 2758         }
 2759 done:
 2760         if (bvec != NULL && bvec != bvec_on_stack)
 2761                 free(bvec, M_TEMP);
 2762         return (error);
 2763 }
 2764 
 2765 /*
 2766  * NFS advisory byte-level locks.
 2767  */
 2768 static int
 2769 nfs4_advlock(struct vop_advlock_args *ap)
 2770 {
 2771         struct vnode *vp = ap->a_vp;
 2772         u_quad_t size;
 2773         int error;
 2774 
 2775         return (EPERM);
 2776 
 2777         error = vn_lock(vp, LK_SHARED, curthread);
 2778         if (error)
 2779                 return (error);
 2780         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 2781                 size = VTONFS(vp)->n_size;
 2782                 VOP_UNLOCK(vp, 0, curthread);
 2783                 error = lf_advlock(ap, &(vp->v_lockf), size);
 2784         } else
 2785                 error = nfs_dolock(ap);
 2786         return (error);
 2787 }
 2788 
 2789 /*
 2790  * NFS advisory byte-level locks.
 2791  */
 2792 static int
 2793 nfs4_advlockasync(struct vop_advlockasync_args *ap)
 2794 {
 2795         struct vnode *vp = ap->a_vp;
 2796         u_quad_t size;
 2797         int error;
 2798 
 2799         return (EPERM);
 2800 
 2801         error = vn_lock(vp, LK_SHARED, curthread);
 2802         if (error)
 2803                 return (error);
 2804         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 2805                 size = VTONFS(vp)->n_size;
 2806                 VOP_UNLOCK(vp, 0, curthread);
 2807                 error = lf_advlockasync(ap, &(vp->v_lockf), size);
 2808         } else {
 2809                 VOP_UNLOCK(vp, 0, curthread);
 2810                 error = EOPNOTSUPP;
 2811         }
 2812         return (error);
 2813 }
 2814 
 2815 /*
 2816  * Print out the contents of an nfsnode.
 2817  */
 2818 static int
 2819 nfs4_print(struct vop_print_args *ap)
 2820 {
 2821         struct vnode *vp = ap->a_vp;
 2822         struct nfsnode *np = VTONFS(vp);
 2823 
 2824         printf("\tfileid %ld fsid 0x%x",
 2825            np->n_vattr.va_fileid, np->n_vattr.va_fsid);
 2826         if (vp->v_type == VFIFO)
 2827                 fifo_printinfo(vp);
 2828         printf("\n");
 2829         return (0);
 2830 }
 2831 
 2832 /*
 2833  * This is the "real" nfs::bwrite(struct buf*).
 2834  * We set B_CACHE if this is a VMIO buffer.
 2835  */
 2836 int
 2837 nfs4_writebp(struct buf *bp, int force __unused, struct thread *td)
 2838 {
 2839         int s;
 2840         int oldflags = bp->b_flags;
 2841 #if 0
 2842         int retv = 1;
 2843         off_t off;
 2844 #endif
 2845 
 2846         if (BUF_REFCNT(bp) == 0)
 2847                 panic("bwrite: buffer is not locked???");
 2848 
 2849         if (bp->b_flags & B_INVAL) {
 2850                 brelse(bp);
 2851                 return(0);
 2852         }
 2853 
 2854         bp->b_flags |= B_CACHE;
 2855 
 2856         /*
 2857          * Undirty the bp.  We will redirty it later if the I/O fails.
 2858          */
 2859 
 2860         s = splbio();
 2861         bundirty(bp);
 2862         bp->b_flags &= ~B_DONE;
 2863         bp->b_ioflags &= ~BIO_ERROR;
 2864         bp->b_iocmd = BIO_WRITE;
 2865 
 2866         bufobj_wref(bp->b_bufobj);
 2867         curthread->td_ru.ru_oublock++;
 2868         splx(s);
 2869 
 2870         /*
 2871          * Note: to avoid loopback deadlocks, we do not
 2872          * assign b_runningbufspace.
 2873          */
 2874         vfs_busy_pages(bp, 1);
 2875 
 2876         BUF_KERNPROC(bp);
 2877         bp->b_iooffset = dbtob(bp->b_blkno);
 2878         bstrategy(bp);
 2879 
 2880         if( (oldflags & B_ASYNC) == 0) {
 2881                 int rtval = bufwait(bp);
 2882 
 2883                 if (oldflags & B_DELWRI) {
 2884                         s = splbio();
 2885                         reassignbuf(bp);
 2886                         splx(s);
 2887                 }
 2888 
 2889                 brelse(bp);
 2890                 return (rtval);
 2891         }
 2892 
 2893         return (0);
 2894 }
 2895 
 2896 /*
 2897  * Just call nfs_writebp() with the force argument set to 1.
 2898  *
 2899  * NOTE: B_DONE may or may not be set in a_bp on call.
 2900  */
 2901 static int
 2902 nfs4_bwrite(struct buf *bp)
 2903 {
 2904 
 2905         return (nfs4_writebp(bp, 1, curthread));
 2906 }
 2907 
 2908 struct buf_ops buf_ops_nfs4 = {
 2909         .bop_name       =       "buf_ops_nfs4",
 2910         .bop_write      =       nfs4_bwrite,
 2911         .bop_strategy   =       bufstrategy,
 2912         .bop_sync       =       bufsync,
 2913         .bop_bdflush    =       bufbdflush,
 2914 };

Cache object: 9efc34e03455b9089b653f2c16608728


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