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

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    1 /*
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95
   37  * $FreeBSD$
   38  */
   39 
   40 
   41 /*
   42  * vnode op calls for Sun NFS version 2 and 3
   43  */
   44 
   45 #include "opt_inet.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/kernel.h>
   49 #include <sys/systm.h>
   50 #include <sys/resourcevar.h>
   51 #include <sys/proc.h>
   52 #include <sys/mount.h>
   53 #include <sys/buf.h>
   54 #include <sys/malloc.h>
   55 #include <sys/mbuf.h>
   56 #include <sys/namei.h>
   57 #include <sys/socket.h>
   58 #include <sys/vnode.h>
   59 #include <sys/dirent.h>
   60 #include <sys/fcntl.h>
   61 #include <sys/lockf.h>
   62 #include <sys/stat.h>
   63 #include <sys/sysctl.h>
   64 #include <sys/conf.h>
   65 
   66 #include <vm/vm.h>
   67 #include <vm/vm_extern.h>
   68 #include <vm/vm_zone.h>
   69 
   70 #include <miscfs/fifofs/fifo.h>
   71 
   72 #include <nfs/rpcv2.h>
   73 #include <nfs/nfsproto.h>
   74 #include <nfs/nfs.h>
   75 #include <nfs/nfsnode.h>
   76 #include <nfs/nfsmount.h>
   77 #include <nfs/xdr_subs.h>
   78 #include <nfs/nfsm_subs.h>
   79 #include <nfs/nqnfs.h>
   80 
   81 #include <net/if.h>
   82 #include <netinet/in.h>
   83 #include <netinet/in_var.h>
   84 
   85 /* Defs */
   86 #define TRUE    1
   87 #define FALSE   0
   88 
   89 /*
   90  * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
   91  * calls are not in getblk() and brelse() so that they would not be necessary
   92  * here.
   93  */
   94 #ifndef B_VMIO
   95 #define vfs_busy_pages(bp, f)
   96 #endif
   97 
   98 static int      nfsspec_read __P((struct vop_read_args *));
   99 static int      nfsspec_write __P((struct vop_write_args *));
  100 static int      nfsfifo_read __P((struct vop_read_args *));
  101 static int      nfsfifo_write __P((struct vop_write_args *));
  102 static int      nfsspec_close __P((struct vop_close_args *));
  103 static int      nfsfifo_close __P((struct vop_close_args *));
  104 #define nfs_poll vop_nopoll
  105 static int      nfs_flush __P((struct vnode *,struct ucred *,int,struct proc *,int));
  106 static int      nfs_setattrrpc __P((struct vnode *,struct vattr *,struct ucred *,struct proc *));
  107 static  int     nfs_lookup __P((struct vop_lookup_args *));
  108 static  int     nfs_create __P((struct vop_create_args *));
  109 static  int     nfs_mknod __P((struct vop_mknod_args *));
  110 static  int     nfs_open __P((struct vop_open_args *));
  111 static  int     nfs_close __P((struct vop_close_args *));
  112 static  int     nfs_access __P((struct vop_access_args *));
  113 static  int     nfs_getattr __P((struct vop_getattr_args *));
  114 static  int     nfs_setattr __P((struct vop_setattr_args *));
  115 static  int     nfs_read __P((struct vop_read_args *));
  116 static  int     nfs_mmap __P((struct vop_mmap_args *));
  117 static  int     nfs_fsync __P((struct vop_fsync_args *));
  118 static  int     nfs_remove __P((struct vop_remove_args *));
  119 static  int     nfs_link __P((struct vop_link_args *));
  120 static  int     nfs_rename __P((struct vop_rename_args *));
  121 static  int     nfs_mkdir __P((struct vop_mkdir_args *));
  122 static  int     nfs_rmdir __P((struct vop_rmdir_args *));
  123 static  int     nfs_symlink __P((struct vop_symlink_args *));
  124 static  int     nfs_readdir __P((struct vop_readdir_args *));
  125 static  int     nfs_bmap __P((struct vop_bmap_args *));
  126 static  int     nfs_strategy __P((struct vop_strategy_args *));
  127 static  int     nfs_lookitup __P((struct vnode *, const char *, int,
  128                         struct ucred *, struct proc *, struct nfsnode **));
  129 static  int     nfs_sillyrename __P((struct vnode *,struct vnode *,struct componentname *));
  130 static int      nfsspec_access __P((struct vop_access_args *));
  131 static int      nfs_readlink __P((struct vop_readlink_args *));
  132 static int      nfs_print __P((struct vop_print_args *));
  133 static int      nfs_advlock __P((struct vop_advlock_args *));
  134 static int      nfs_bwrite __P((struct vop_bwrite_args *));
  135 /*
  136  * Global vfs data structures for nfs
  137  */
  138 vop_t **nfsv2_vnodeop_p;
  139 static struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = {
  140         { &vop_default_desc,            (vop_t *) vop_defaultop },
  141         { &vop_access_desc,             (vop_t *) nfs_access },
  142         { &vop_advlock_desc,            (vop_t *) nfs_advlock },
  143         { &vop_bmap_desc,               (vop_t *) nfs_bmap },
  144         { &vop_bwrite_desc,             (vop_t *) nfs_bwrite },
  145         { &vop_close_desc,              (vop_t *) nfs_close },
  146         { &vop_create_desc,             (vop_t *) nfs_create },
  147         { &vop_fsync_desc,              (vop_t *) nfs_fsync },
  148         { &vop_getattr_desc,            (vop_t *) nfs_getattr },
  149         { &vop_getpages_desc,           (vop_t *) nfs_getpages },
  150         { &vop_putpages_desc,           (vop_t *) nfs_putpages },
  151         { &vop_inactive_desc,           (vop_t *) nfs_inactive },
  152         { &vop_islocked_desc,           (vop_t *) vop_stdislocked },
  153         { &vop_lease_desc,              (vop_t *) vop_null },
  154         { &vop_link_desc,               (vop_t *) nfs_link },
  155         { &vop_lock_desc,               (vop_t *) vop_sharedlock },
  156         { &vop_lookup_desc,             (vop_t *) nfs_lookup },
  157         { &vop_mkdir_desc,              (vop_t *) nfs_mkdir },
  158         { &vop_mknod_desc,              (vop_t *) nfs_mknod },
  159         { &vop_mmap_desc,               (vop_t *) nfs_mmap },
  160         { &vop_open_desc,               (vop_t *) nfs_open },
  161         { &vop_poll_desc,               (vop_t *) nfs_poll },
  162         { &vop_print_desc,              (vop_t *) nfs_print },
  163         { &vop_read_desc,               (vop_t *) nfs_read },
  164         { &vop_readdir_desc,            (vop_t *) nfs_readdir },
  165         { &vop_readlink_desc,           (vop_t *) nfs_readlink },
  166         { &vop_reclaim_desc,            (vop_t *) nfs_reclaim },
  167         { &vop_remove_desc,             (vop_t *) nfs_remove },
  168         { &vop_rename_desc,             (vop_t *) nfs_rename },
  169         { &vop_rmdir_desc,              (vop_t *) nfs_rmdir },
  170         { &vop_setattr_desc,            (vop_t *) nfs_setattr },
  171         { &vop_strategy_desc,           (vop_t *) nfs_strategy },
  172         { &vop_symlink_desc,            (vop_t *) nfs_symlink },
  173         { &vop_unlock_desc,             (vop_t *) vop_stdunlock },
  174         { &vop_write_desc,              (vop_t *) nfs_write },
  175         { NULL, NULL }
  176 };
  177 static struct vnodeopv_desc nfsv2_vnodeop_opv_desc =
  178         { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries };
  179 VNODEOP_SET(nfsv2_vnodeop_opv_desc);
  180 
  181 /*
  182  * Special device vnode ops
  183  */
  184 vop_t **spec_nfsv2nodeop_p;
  185 static struct vnodeopv_entry_desc nfsv2_specop_entries[] = {
  186         { &vop_default_desc,            (vop_t *) spec_vnoperate },
  187         { &vop_access_desc,             (vop_t *) nfsspec_access },
  188         { &vop_close_desc,              (vop_t *) nfsspec_close },
  189         { &vop_fsync_desc,              (vop_t *) nfs_fsync },
  190         { &vop_getattr_desc,            (vop_t *) nfs_getattr },
  191         { &vop_inactive_desc,           (vop_t *) nfs_inactive },
  192         { &vop_islocked_desc,           (vop_t *) vop_stdislocked },
  193         { &vop_lock_desc,               (vop_t *) vop_sharedlock },
  194         { &vop_print_desc,              (vop_t *) nfs_print },
  195         { &vop_read_desc,               (vop_t *) nfsspec_read },
  196         { &vop_reclaim_desc,            (vop_t *) nfs_reclaim },
  197         { &vop_setattr_desc,            (vop_t *) nfs_setattr },
  198         { &vop_unlock_desc,             (vop_t *) vop_stdunlock },
  199         { &vop_write_desc,              (vop_t *) nfsspec_write },
  200         { NULL, NULL }
  201 };
  202 static struct vnodeopv_desc spec_nfsv2nodeop_opv_desc =
  203         { &spec_nfsv2nodeop_p, nfsv2_specop_entries };
  204 VNODEOP_SET(spec_nfsv2nodeop_opv_desc);
  205 
  206 vop_t **fifo_nfsv2nodeop_p;
  207 static struct vnodeopv_entry_desc nfsv2_fifoop_entries[] = {
  208         { &vop_default_desc,            (vop_t *) fifo_vnoperate },
  209         { &vop_access_desc,             (vop_t *) nfsspec_access },
  210         { &vop_close_desc,              (vop_t *) nfsfifo_close },
  211         { &vop_fsync_desc,              (vop_t *) nfs_fsync },
  212         { &vop_getattr_desc,            (vop_t *) nfs_getattr },
  213         { &vop_inactive_desc,           (vop_t *) nfs_inactive },
  214         { &vop_islocked_desc,           (vop_t *) vop_stdislocked },
  215         { &vop_lock_desc,               (vop_t *) vop_sharedlock },
  216         { &vop_print_desc,              (vop_t *) nfs_print },
  217         { &vop_read_desc,               (vop_t *) nfsfifo_read },
  218         { &vop_reclaim_desc,            (vop_t *) nfs_reclaim },
  219         { &vop_setattr_desc,            (vop_t *) nfs_setattr },
  220         { &vop_unlock_desc,             (vop_t *) vop_stdunlock },
  221         { &vop_write_desc,              (vop_t *) nfsfifo_write },
  222         { NULL, NULL }
  223 };
  224 static struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc =
  225         { &fifo_nfsv2nodeop_p, nfsv2_fifoop_entries };
  226 VNODEOP_SET(fifo_nfsv2nodeop_opv_desc);
  227 
  228 static int      nfs_mknodrpc __P((struct vnode *dvp, struct vnode **vpp,
  229                                   struct componentname *cnp,
  230                                   struct vattr *vap));
  231 static int      nfs_removerpc __P((struct vnode *dvp, const char *name,
  232                                    int namelen,
  233                                    struct ucred *cred, struct proc *proc));
  234 static int      nfs_renamerpc __P((struct vnode *fdvp, const char *fnameptr,
  235                                    int fnamelen, struct vnode *tdvp,
  236                                    const char *tnameptr, int tnamelen,
  237                                    struct ucred *cred, struct proc *proc));
  238 static int      nfs_renameit __P((struct vnode *sdvp,
  239                                   struct componentname *scnp,
  240                                   struct sillyrename *sp));
  241 
  242 /*
  243  * Global variables
  244  */
  245 extern u_int32_t nfs_true, nfs_false;
  246 extern u_int32_t nfs_xdrneg1;
  247 extern struct nfsstats nfsstats;
  248 extern nfstype nfsv3_type[9];
  249 struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
  250 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
  251 int nfs_numasync = 0;
  252 #define DIRHDSIZ        (sizeof (struct dirent) - (MAXNAMLEN + 1))
  253 
  254 SYSCTL_DECL(_vfs_nfs);
  255 
  256 static int      nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
  257 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 
  258            &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
  259 
  260 static int      nfsv3_commit_on_close = 0;
  261 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 
  262            &nfsv3_commit_on_close, 0, "write+commit on close, else only write");
  263 #if 0
  264 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 
  265            &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
  266 
  267 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 
  268            &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
  269 #endif
  270 
  271 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY          \
  272                          | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE     \
  273                          | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP)
  274 static int
  275 nfs3_access_otw(struct vnode *vp,
  276                 int wmode,
  277                 struct proc *p,
  278                 struct ucred *cred)
  279 {
  280         const int v3 = 1;
  281         u_int32_t *tl;
  282         int error = 0, attrflag;
  283         
  284         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
  285         caddr_t bpos, dpos, cp2;
  286         register int32_t t1, t2;
  287         register caddr_t cp;
  288         u_int32_t rmode;
  289         struct nfsnode *np = VTONFS(vp);
  290 
  291         nfsstats.rpccnt[NFSPROC_ACCESS]++;
  292         nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED);
  293         nfsm_fhtom(vp, v3);
  294         nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
  295         *tl = txdr_unsigned(wmode); 
  296         nfsm_request(vp, NFSPROC_ACCESS, p, cred);
  297         nfsm_postop_attr(vp, attrflag);
  298         if (!error) {
  299                 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
  300                 rmode = fxdr_unsigned(u_int32_t, *tl);
  301                 np->n_mode = rmode;
  302                 np->n_modeuid = cred->cr_uid;
  303                 np->n_modestamp = time_second;
  304         }
  305         nfsm_reqdone;
  306         return error;
  307 }
  308 
  309 /*
  310  * nfs access vnode op.
  311  * For nfs version 2, just return ok. File accesses may fail later.
  312  * For nfs version 3, use the access rpc to check accessibility. If file modes
  313  * are changed on the server, accesses might still fail later.
  314  */
  315 static int
  316 nfs_access(ap)
  317         struct vop_access_args /* {
  318                 struct vnode *a_vp;
  319                 int  a_mode;
  320                 struct ucred *a_cred;
  321                 struct proc *a_p;
  322         } */ *ap;
  323 {
  324         register struct vnode *vp = ap->a_vp;
  325         int error = 0;
  326         u_int32_t mode, wmode;
  327         int v3 = NFS_ISV3(vp);
  328         struct nfsnode *np = VTONFS(vp);
  329 
  330         /*
  331          * Disallow write attempts on filesystems mounted read-only;
  332          * unless the file is a socket, fifo, or a block or character
  333          * device resident on the filesystem.
  334          */
  335         if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
  336                 switch (vp->v_type) {
  337                 case VREG:
  338                 case VDIR:
  339                 case VLNK:
  340                         return (EROFS);
  341                 default:
  342                         break;
  343                 }
  344         }
  345         /*
  346          * For nfs v3, check to see if we have done this recently, and if
  347          * so return our cached result instead of making an ACCESS call.
  348          * If not, do an access rpc, otherwise you are stuck emulating
  349          * ufs_access() locally using the vattr. This may not be correct,
  350          * since the server may apply other access criteria such as
  351          * client uid-->server uid mapping that we do not know about.
  352          */
  353         if (v3) {
  354                 if (ap->a_mode & VREAD)
  355                         mode = NFSV3ACCESS_READ;
  356                 else
  357                         mode = 0;
  358                 if (vp->v_type != VDIR) {
  359                         if (ap->a_mode & VWRITE)
  360                                 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
  361                         if (ap->a_mode & VEXEC)
  362                                 mode |= NFSV3ACCESS_EXECUTE;
  363                 } else {
  364                         if (ap->a_mode & VWRITE)
  365                                 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
  366                                          NFSV3ACCESS_DELETE);
  367                         if (ap->a_mode & VEXEC)
  368                                 mode |= NFSV3ACCESS_LOOKUP;
  369                 }
  370                 /* XXX safety belt, only make blanket request if caching */
  371                 if (nfsaccess_cache_timeout > 0) {
  372                         wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 
  373                                 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 
  374                                 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP;
  375                 } else {
  376                         wmode = mode;
  377                 }
  378 
  379                 /*
  380                  * Does our cached result allow us to give a definite yes to
  381                  * this request?
  382                  */
  383                 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) &&
  384                     (ap->a_cred->cr_uid == np->n_modeuid) &&
  385                     ((np->n_mode & mode) == mode)) {
  386                         nfsstats.accesscache_hits++;
  387                 } else {
  388                         /*
  389                          * Either a no, or a don't know.  Go to the wire.
  390                          */
  391                         nfsstats.accesscache_misses++;
  392                         error = nfs3_access_otw(vp, wmode, ap->a_p,ap->a_cred);
  393                         if (!error) {
  394                                 if ((np->n_mode & mode) != mode) {
  395                                         error = EACCES;
  396                                 }
  397                         }
  398                 }
  399                 return (error);
  400         } else {
  401                 if ((error = nfsspec_access(ap)) != 0)
  402                         return (error);
  403 
  404                 /*
  405                  * Attempt to prevent a mapped root from accessing a file
  406                  * which it shouldn't.  We try to read a byte from the file
  407                  * if the user is root and the file is not zero length.
  408                  * After calling nfsspec_access, we should have the correct
  409                  * file size cached.
  410                  */
  411                 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD)
  412                     && VTONFS(vp)->n_size > 0) {
  413                         struct iovec aiov;
  414                         struct uio auio;
  415                         char buf[1];
  416 
  417                         aiov.iov_base = buf;
  418                         aiov.iov_len = 1;
  419                         auio.uio_iov = &aiov;
  420                         auio.uio_iovcnt = 1;
  421                         auio.uio_offset = 0;
  422                         auio.uio_resid = 1;
  423                         auio.uio_segflg = UIO_SYSSPACE;
  424                         auio.uio_rw = UIO_READ;
  425                         auio.uio_procp = ap->a_p;
  426 
  427                         if (vp->v_type == VREG)
  428                                 error = nfs_readrpc(vp, &auio, ap->a_cred);
  429                         else if (vp->v_type == VDIR) {
  430                                 char* bp;
  431                                 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
  432                                 aiov.iov_base = bp;
  433                                 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
  434                                 error = nfs_readdirrpc(vp, &auio, ap->a_cred);
  435                                 free(bp, M_TEMP);
  436                         } else if (vp->v_type == VLNK)
  437                                 error = nfs_readlinkrpc(vp, &auio, ap->a_cred);
  438                         else
  439                                 error = EACCES;
  440                 }
  441                 return (error);
  442         }
  443 }
  444 
  445 /*
  446  * nfs open vnode op
  447  * Check to see if the type is ok
  448  * and that deletion is not in progress.
  449  * For paged in text files, you will need to flush the page cache
  450  * if consistency is lost.
  451  */
  452 /* ARGSUSED */
  453 static int
  454 nfs_open(ap)
  455         struct vop_open_args /* {
  456                 struct vnode *a_vp;
  457                 int  a_mode;
  458                 struct ucred *a_cred;
  459                 struct proc *a_p;
  460         } */ *ap;
  461 {
  462         register struct vnode *vp = ap->a_vp;
  463         struct nfsnode *np = VTONFS(vp);
  464         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
  465         struct vattr vattr;
  466         int error;
  467 
  468         if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) {
  469 #ifdef DIAGNOSTIC
  470                 printf("open eacces vtyp=%d\n",vp->v_type);
  471 #endif
  472                 return (EOPNOTSUPP);
  473         }
  474         /*
  475          * Get a valid lease. If cached data is stale, flush it.
  476          */
  477         if (nmp->nm_flag & NFSMNT_NQNFS) {
  478                 if (NQNFS_CKINVALID(vp, np, ND_READ)) {
  479                     do {
  480                         error = nqnfs_getlease(vp, ND_READ, ap->a_cred,
  481                             ap->a_p);
  482                     } while (error == NQNFS_EXPIRED);
  483                     if (error)
  484                         return (error);
  485                     if (np->n_lrev != np->n_brev ||
  486                         (np->n_flag & NQNFSNONCACHE)) {
  487                         if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
  488                                 ap->a_p, 1)) == EINTR)
  489                                 return (error);
  490                         np->n_brev = np->n_lrev;
  491                     }
  492                 }
  493         } else {
  494                 if (np->n_flag & NMODIFIED) {
  495                         if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
  496                                 ap->a_p, 1)) == EINTR)
  497                                 return (error);
  498                         np->n_attrstamp = 0;
  499                         if (vp->v_type == VDIR)
  500                                 np->n_direofoffset = 0;
  501                         error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p);
  502                         if (error)
  503                                 return (error);
  504                         np->n_mtime = vattr.va_mtime.tv_sec;
  505                 } else {
  506                         error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p);
  507                         if (error)
  508                                 return (error);
  509                         if (np->n_mtime != vattr.va_mtime.tv_sec) {
  510                                 if (vp->v_type == VDIR)
  511                                         np->n_direofoffset = 0;
  512                                 if ((error = nfs_vinvalbuf(vp, V_SAVE,
  513                                         ap->a_cred, ap->a_p, 1)) == EINTR)
  514                                         return (error);
  515                                 np->n_mtime = vattr.va_mtime.tv_sec;
  516                         }
  517                 }
  518         }
  519         if ((nmp->nm_flag & NFSMNT_NQNFS) == 0)
  520                 np->n_attrstamp = 0; /* For Open/Close consistency */
  521         return (0);
  522 }
  523 
  524 /*
  525  * nfs close vnode op
  526  * What an NFS client should do upon close after writing is a debatable issue.
  527  * Most NFS clients push delayed writes to the server upon close, basically for
  528  * two reasons:
  529  * 1 - So that any write errors may be reported back to the client process
  530  *     doing the close system call. By far the two most likely errors are
  531  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
  532  * 2 - To put a worst case upper bound on cache inconsistency between
  533  *     multiple clients for the file.
  534  * There is also a consistency problem for Version 2 of the protocol w.r.t.
  535  * not being able to tell if other clients are writing a file concurrently,
  536  * since there is no way of knowing if the changed modify time in the reply
  537  * is only due to the write for this client.
  538  * (NFS Version 3 provides weak cache consistency data in the reply that
  539  *  should be sufficient to detect and handle this case.)
  540  *
  541  * The current code does the following:
  542  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
  543  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
  544  *                     or commit them (this satisfies 1 and 2 except for the
  545  *                     case where the server crashes after this close but
  546  *                     before the commit RPC, which is felt to be "good
  547  *                     enough". Changing the last argument to nfs_flush() to
  548  *                     a 1 would force a commit operation, if it is felt a
  549  *                     commit is necessary now.
  550  * for NQNFS         - do nothing now, since 2 is dealt with via leases and
  551  *                     1 should be dealt with via an fsync() system call for
  552  *                     cases where write errors are important.
  553  */
  554 /* ARGSUSED */
  555 static int
  556 nfs_close(ap)
  557         struct vop_close_args /* {
  558                 struct vnodeop_desc *a_desc;
  559                 struct vnode *a_vp;
  560                 int  a_fflag;
  561                 struct ucred *a_cred;
  562                 struct proc *a_p;
  563         } */ *ap;
  564 {
  565         register struct vnode *vp = ap->a_vp;
  566         register struct nfsnode *np = VTONFS(vp);
  567         int error = 0;
  568 
  569         if (vp->v_type == VREG) {
  570             if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) == 0 &&
  571                 (np->n_flag & NMODIFIED)) {
  572                 if (NFS_ISV3(vp)) {
  573                     /*
  574                      * Under NFSv3 we have dirty buffers to dispose of.  We
  575                      * must flush them to the NFS server.  We have the option
  576                      * of waiting all the way through the commit rpc or just
  577                      * waiting for the initial write.  The default is to only
  578                      * wait through the initial write so the data is in the
  579                      * server's cache, which is roughly similar to the state
  580                      * a standard disk subsystem leaves the file in on close().
  581                      *
  582                      * We cannot clear the NMODIFIED bit in np->n_flag due to
  583                      * potential races with other processes, and certainly
  584                      * cannot clear it if we don't commit.
  585                      */
  586                     int cm = nfsv3_commit_on_close ? 1 : 0;
  587                     error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_p, cm);
  588                     /* np->n_flag &= ~NMODIFIED; */
  589                 } else {
  590                     error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 1);
  591                 }
  592                 np->n_attrstamp = 0;
  593             }
  594             if (np->n_flag & NWRITEERR) {
  595                 np->n_flag &= ~NWRITEERR;
  596                 error = np->n_error;
  597             }
  598         }
  599         return (error);
  600 }
  601 
  602 /*
  603  * nfs getattr call from vfs.
  604  */
  605 static int
  606 nfs_getattr(ap)
  607         struct vop_getattr_args /* {
  608                 struct vnode *a_vp;
  609                 struct vattr *a_vap;
  610                 struct ucred *a_cred;
  611                 struct proc *a_p;
  612         } */ *ap;
  613 {
  614         register struct vnode *vp = ap->a_vp;
  615         register struct nfsnode *np = VTONFS(vp);
  616         register caddr_t cp;
  617         register u_int32_t *tl;
  618         register int32_t t1, t2;
  619         caddr_t bpos, dpos;
  620         int error = 0;
  621         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
  622         int v3 = NFS_ISV3(vp);
  623         
  624         /*
  625          * Update local times for special files.
  626          */
  627         if (np->n_flag & (NACC | NUPD))
  628                 np->n_flag |= NCHG;
  629         /*
  630          * First look in the cache.
  631          */
  632         if (nfs_getattrcache(vp, ap->a_vap) == 0)
  633                 return (0);
  634 
  635         if (v3 && nfsaccess_cache_timeout > 0) {
  636                 nfsstats.accesscache_misses++;
  637                 nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_p, ap->a_cred);
  638                 if (nfs_getattrcache(vp, ap->a_vap) == 0)
  639                         return (0);
  640         }
  641 
  642         nfsstats.rpccnt[NFSPROC_GETATTR]++;
  643         nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3));
  644         nfsm_fhtom(vp, v3);
  645         nfsm_request(vp, NFSPROC_GETATTR, ap->a_p, ap->a_cred);
  646         if (!error) {
  647                 nfsm_loadattr(vp, ap->a_vap);
  648         }
  649         nfsm_reqdone;
  650         return (error);
  651 }
  652 
  653 /*
  654  * nfs setattr call.
  655  */
  656 static int
  657 nfs_setattr(ap)
  658         struct vop_setattr_args /* {
  659                 struct vnodeop_desc *a_desc;
  660                 struct vnode *a_vp;
  661                 struct vattr *a_vap;
  662                 struct ucred *a_cred;
  663                 struct proc *a_p;
  664         } */ *ap;
  665 {
  666         register struct vnode *vp = ap->a_vp;
  667         register struct nfsnode *np = VTONFS(vp);
  668         register struct vattr *vap = ap->a_vap;
  669         int error = 0;
  670         u_quad_t tsize;
  671 
  672 #ifndef nolint
  673         tsize = (u_quad_t)0;
  674 #endif
  675 
  676         /*
  677          * Setting of flags is not supported.
  678          */
  679         if (vap->va_flags != VNOVAL)
  680                 return (EOPNOTSUPP);
  681 
  682         /*
  683          * Disallow write attempts if the filesystem is mounted read-only.
  684          */
  685         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  686             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  687             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  688             (vp->v_mount->mnt_flag & MNT_RDONLY))
  689                 return (EROFS);
  690         if (vap->va_size != VNOVAL) {
  691                 switch (vp->v_type) {
  692                 case VDIR:
  693                         return (EISDIR);
  694                 case VCHR:
  695                 case VBLK:
  696                 case VSOCK:
  697                 case VFIFO:
  698                         if (vap->va_mtime.tv_sec == VNOVAL &&
  699                             vap->va_atime.tv_sec == VNOVAL &&
  700                             vap->va_mode == (mode_t)VNOVAL &&
  701                             vap->va_uid == (uid_t)VNOVAL &&
  702                             vap->va_gid == (gid_t)VNOVAL)
  703                                 return (0);
  704                         vap->va_size = VNOVAL;
  705                         break;
  706                 default:
  707                         /*
  708                          * Disallow write attempts if the filesystem is
  709                          * mounted read-only.
  710                          */
  711                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  712                                 return (EROFS);
  713 
  714                         /*
  715                          * We run vnode_pager_setsize() early (why?),
  716                          * we must set np->n_size now to avoid vinvalbuf
  717                          * V_SAVE races that might setsize a lower
  718                          * value.
  719                          */
  720 
  721                         tsize = np->n_size;
  722                         error = nfs_meta_setsize(vp, ap->a_cred, 
  723                                                 ap->a_p, vap->va_size);
  724 
  725                         if (np->n_flag & NMODIFIED) {
  726                             if (vap->va_size == 0)
  727                                 error = nfs_vinvalbuf(vp, 0,
  728                                         ap->a_cred, ap->a_p, 1);
  729                             else
  730                                 error = nfs_vinvalbuf(vp, V_SAVE,
  731                                         ap->a_cred, ap->a_p, 1);
  732                             if (error) {
  733                                 np->n_size = tsize;
  734                                 vnode_pager_setsize(vp, np->n_size);
  735                                 return (error);
  736                             }
  737                         }
  738                         /*
  739                          * np->n_size has already been set to vap->va_size
  740                          * in nfs_meta_setsize(). We must set it again since
  741                          * nfs_loadattrcache() could be called through
  742                          * nfs_meta_setsize() and could modify np->n_size.
  743                          */
  744                         np->n_vattr.va_size = np->n_size = vap->va_size;
  745                 };
  746         } else if ((vap->va_mtime.tv_sec != VNOVAL ||
  747                 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) &&
  748                 vp->v_type == VREG &&
  749                 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
  750                  ap->a_p, 1)) == EINTR)
  751                 return (error);
  752         error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_p);
  753         if (error && vap->va_size != VNOVAL) {
  754                 np->n_size = np->n_vattr.va_size = tsize;
  755                 vnode_pager_setsize(vp, np->n_size);
  756         }
  757         return (error);
  758 }
  759 
  760 /*
  761  * Do an nfs setattr rpc.
  762  */
  763 static int
  764 nfs_setattrrpc(vp, vap, cred, procp)
  765         register struct vnode *vp;
  766         register struct vattr *vap;
  767         struct ucred *cred;
  768         struct proc *procp;
  769 {
  770         register struct nfsv2_sattr *sp;
  771         register caddr_t cp;
  772         register int32_t t1, t2;
  773         caddr_t bpos, dpos, cp2;
  774         u_int32_t *tl;
  775         int error = 0, wccflag = NFSV3_WCCRATTR;
  776         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
  777         int v3 = NFS_ISV3(vp);
  778 
  779         nfsstats.rpccnt[NFSPROC_SETATTR]++;
  780         nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3));
  781         nfsm_fhtom(vp, v3);
  782         if (v3) {
  783                 nfsm_v3attrbuild(vap, TRUE);
  784                 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
  785                 *tl = nfs_false;
  786         } else {
  787                 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
  788                 if (vap->va_mode == (mode_t)VNOVAL)
  789                         sp->sa_mode = nfs_xdrneg1;
  790                 else
  791                         sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode);
  792                 if (vap->va_uid == (uid_t)VNOVAL)
  793                         sp->sa_uid = nfs_xdrneg1;
  794                 else
  795                         sp->sa_uid = txdr_unsigned(vap->va_uid);
  796                 if (vap->va_gid == (gid_t)VNOVAL)
  797                         sp->sa_gid = nfs_xdrneg1;
  798                 else
  799                         sp->sa_gid = txdr_unsigned(vap->va_gid);
  800                 sp->sa_size = txdr_unsigned(vap->va_size);
  801                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
  802                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
  803         }
  804         nfsm_request(vp, NFSPROC_SETATTR, procp, cred);
  805         if (v3) {
  806                 nfsm_wcc_data(vp, wccflag);
  807         } else
  808                 nfsm_loadattr(vp, (struct vattr *)0);
  809         nfsm_reqdone;
  810         return (error);
  811 }
  812 
  813 /*
  814  * nfs lookup call, one step at a time...
  815  * First look in cache
  816  * If not found, unlock the directory nfsnode and do the rpc
  817  */
  818 static int
  819 nfs_lookup(ap)
  820         struct vop_lookup_args /* {
  821                 struct vnodeop_desc *a_desc;
  822                 struct vnode *a_dvp;
  823                 struct vnode **a_vpp;
  824                 struct componentname *a_cnp;
  825         } */ *ap;
  826 {
  827         struct componentname *cnp = ap->a_cnp;
  828         struct vnode *dvp = ap->a_dvp;
  829         struct vnode **vpp = ap->a_vpp;
  830         int flags = cnp->cn_flags;
  831         struct vnode *newvp;
  832         u_int32_t *tl;
  833         caddr_t cp;
  834         int32_t t1, t2;
  835         struct nfsmount *nmp;
  836         caddr_t bpos, dpos, cp2;
  837         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
  838         long len;
  839         nfsfh_t *fhp;
  840         struct nfsnode *np;
  841         int lockparent, wantparent, error = 0, attrflag, fhsize;
  842         int v3 = NFS_ISV3(dvp);
  843         struct proc *p = cnp->cn_proc;
  844 
  845         *vpp = NULLVP;
  846         if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
  847             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
  848                 return (EROFS);
  849         if (dvp->v_type != VDIR)
  850                 return (ENOTDIR);
  851         lockparent = flags & LOCKPARENT;
  852         wantparent = flags & (LOCKPARENT|WANTPARENT);
  853         nmp = VFSTONFS(dvp->v_mount);
  854         np = VTONFS(dvp);
  855         if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) {
  856                 struct vattr vattr;
  857                 int vpid;
  858 
  859                 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, p)) != 0) {
  860                         *vpp = NULLVP;
  861                         return (error);
  862                 }
  863 
  864                 newvp = *vpp;
  865                 vpid = newvp->v_id;
  866                 /*
  867                  * See the comment starting `Step through' in ufs/ufs_lookup.c
  868                  * for an explanation of the locking protocol
  869                  */
  870                 if (dvp == newvp) {
  871                         VREF(newvp);
  872                         error = 0;
  873                 } else if (flags & ISDOTDOT) {
  874                         VOP_UNLOCK(dvp, 0, p);
  875                         error = vget(newvp, LK_EXCLUSIVE, p);
  876                         if (!error && lockparent && (flags & ISLASTCN))
  877                                 error = vn_lock(dvp, LK_EXCLUSIVE, p);
  878                 } else {
  879                         error = vget(newvp, LK_EXCLUSIVE, p);
  880                         if (!lockparent || error || !(flags & ISLASTCN))
  881                                 VOP_UNLOCK(dvp, 0, p);
  882                 }
  883                 if (!error) {
  884                         if (vpid == newvp->v_id) {
  885                            if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, p)
  886                             && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
  887                                 nfsstats.lookupcache_hits++;
  888                                 if (cnp->cn_nameiop != LOOKUP &&
  889                                     (flags & ISLASTCN))
  890                                         cnp->cn_flags |= SAVENAME;
  891                                 return (0);
  892                            }
  893                            cache_purge(newvp);
  894                         }
  895                         vput(newvp);
  896                         if (lockparent && dvp != newvp && (flags & ISLASTCN))
  897                                 VOP_UNLOCK(dvp, 0, p);
  898                 }
  899                 error = vn_lock(dvp, LK_EXCLUSIVE, p);
  900                 *vpp = NULLVP;
  901                 if (error)
  902                         return (error);
  903         }
  904         error = 0;
  905         newvp = NULLVP;
  906         nfsstats.lookupcache_misses++;
  907         nfsstats.rpccnt[NFSPROC_LOOKUP]++;
  908         len = cnp->cn_namelen;
  909         nfsm_reqhead(dvp, NFSPROC_LOOKUP,
  910                 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
  911         nfsm_fhtom(dvp, v3);
  912         nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
  913         nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_proc, cnp->cn_cred);
  914         if (error) {
  915                 nfsm_postop_attr(dvp, attrflag);
  916                 m_freem(mrep);
  917                 goto nfsmout;
  918         }
  919         nfsm_getfh(fhp, fhsize, v3);
  920 
  921         /*
  922          * Handle RENAME case...
  923          */
  924         if (cnp->cn_nameiop == RENAME && wantparent && (flags & ISLASTCN)) {
  925                 if (NFS_CMPFH(np, fhp, fhsize)) {
  926                         m_freem(mrep);
  927                         return (EISDIR);
  928                 }
  929                 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
  930                 if (error) {
  931                         m_freem(mrep);
  932                         return (error);
  933                 }
  934                 newvp = NFSTOV(np);
  935                 if (v3) {
  936                         nfsm_postop_attr(newvp, attrflag);
  937                         nfsm_postop_attr(dvp, attrflag);
  938                 } else
  939                         nfsm_loadattr(newvp, (struct vattr *)0);
  940                 *vpp = newvp;
  941                 m_freem(mrep);
  942                 cnp->cn_flags |= SAVENAME;
  943                 if (!lockparent)
  944                         VOP_UNLOCK(dvp, 0, p);
  945                 return (0);
  946         }
  947 
  948         if (flags & ISDOTDOT) {
  949                 VOP_UNLOCK(dvp, 0, p);
  950                 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
  951                 if (error) {
  952                         vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, p);
  953                         return (error);
  954                 }
  955                 newvp = NFSTOV(np);
  956                 if (lockparent && (flags & ISLASTCN) &&
  957                     (error = vn_lock(dvp, LK_EXCLUSIVE, p))) {
  958                         vput(newvp);
  959                         return (error);
  960                 }
  961         } else if (NFS_CMPFH(np, fhp, fhsize)) {
  962                 VREF(dvp);
  963                 newvp = dvp;
  964         } else {
  965                 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
  966                 if (error) {
  967                         m_freem(mrep);
  968                         return (error);
  969                 }
  970                 if (!lockparent || !(flags & ISLASTCN))
  971                         VOP_UNLOCK(dvp, 0, p);
  972                 newvp = NFSTOV(np);
  973         }
  974         if (v3) {
  975                 nfsm_postop_attr(newvp, attrflag);
  976                 nfsm_postop_attr(dvp, attrflag);
  977         } else
  978                 nfsm_loadattr(newvp, (struct vattr *)0);
  979         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
  980                 cnp->cn_flags |= SAVENAME;
  981         if ((cnp->cn_flags & MAKEENTRY) &&
  982             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
  983                 np->n_ctime = np->n_vattr.va_ctime.tv_sec;
  984                 cache_enter(dvp, newvp, cnp);
  985         }
  986         *vpp = newvp;
  987         nfsm_reqdone;
  988         if (error) {
  989                 if (newvp != NULLVP) {
  990                         vrele(newvp);
  991                         *vpp = NULLVP;
  992                 }
  993                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
  994                     (flags & ISLASTCN) && error == ENOENT) {
  995                         if (!lockparent)
  996                                 VOP_UNLOCK(dvp, 0, p);
  997                         if (dvp->v_mount->mnt_flag & MNT_RDONLY)
  998                                 error = EROFS;
  999                         else
 1000                                 error = EJUSTRETURN;
 1001                 }
 1002                 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1003                         cnp->cn_flags |= SAVENAME;
 1004         }
 1005         return (error);
 1006 }
 1007 
 1008 /*
 1009  * nfs read call.
 1010  * Just call nfs_bioread() to do the work.
 1011  */
 1012 static int
 1013 nfs_read(ap)
 1014         struct vop_read_args /* {
 1015                 struct vnode *a_vp;
 1016                 struct uio *a_uio;
 1017                 int  a_ioflag;
 1018                 struct ucred *a_cred;
 1019         } */ *ap;
 1020 {
 1021         register struct vnode *vp = ap->a_vp;
 1022 
 1023         switch (vp->v_type) {
 1024         case VREG:
 1025                 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1026         case VDIR:
 1027                 return (EISDIR);
 1028         default:
 1029                 return (EOPNOTSUPP);
 1030         }
 1031 }
 1032 
 1033 /*
 1034  * nfs readlink call
 1035  */
 1036 static int
 1037 nfs_readlink(ap)
 1038         struct vop_readlink_args /* {
 1039                 struct vnode *a_vp;
 1040                 struct uio *a_uio;
 1041                 struct ucred *a_cred;
 1042         } */ *ap;
 1043 {
 1044         register struct vnode *vp = ap->a_vp;
 1045 
 1046         if (vp->v_type != VLNK)
 1047                 return (EINVAL);
 1048         return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1049 }
 1050 
 1051 /*
 1052  * Do a readlink rpc.
 1053  * Called by nfs_doio() from below the buffer cache.
 1054  */
 1055 int
 1056 nfs_readlinkrpc(vp, uiop, cred)
 1057         register struct vnode *vp;
 1058         struct uio *uiop;
 1059         struct ucred *cred;
 1060 {
 1061         register u_int32_t *tl;
 1062         register caddr_t cp;
 1063         register int32_t t1, t2;
 1064         caddr_t bpos, dpos, cp2;
 1065         int error = 0, len, attrflag;
 1066         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 1067         int v3 = NFS_ISV3(vp);
 1068 
 1069         nfsstats.rpccnt[NFSPROC_READLINK]++;
 1070         nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3));
 1071         nfsm_fhtom(vp, v3);
 1072         nfsm_request(vp, NFSPROC_READLINK, uiop->uio_procp, cred);
 1073         if (v3)
 1074                 nfsm_postop_attr(vp, attrflag);
 1075         if (!error) {
 1076                 nfsm_strsiz(len, NFS_MAXPATHLEN);
 1077                 if (len == NFS_MAXPATHLEN) {
 1078                         struct nfsnode *np = VTONFS(vp);
 1079                         if (np->n_size && np->n_size < NFS_MAXPATHLEN)
 1080                                 len = np->n_size;
 1081                 }
 1082                 nfsm_mtouio(uiop, len);
 1083         }
 1084         nfsm_reqdone;
 1085         return (error);
 1086 }
 1087 
 1088 /*
 1089  * nfs read rpc call
 1090  * Ditto above
 1091  */
 1092 int
 1093 nfs_readrpc(vp, uiop, cred)
 1094         register struct vnode *vp;
 1095         struct uio *uiop;
 1096         struct ucred *cred;
 1097 {
 1098         register u_int32_t *tl;
 1099         register caddr_t cp;
 1100         register int32_t t1, t2;
 1101         caddr_t bpos, dpos, cp2;
 1102         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 1103         struct nfsmount *nmp;
 1104         int error = 0, len, retlen, tsiz, eof, attrflag;
 1105         int v3 = NFS_ISV3(vp);
 1106 
 1107 #ifndef nolint
 1108         eof = 0;
 1109 #endif
 1110         nmp = VFSTONFS(vp->v_mount);
 1111         tsiz = uiop->uio_resid;
 1112         if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
 1113                 return (EFBIG);
 1114         while (tsiz > 0) {
 1115                 nfsstats.rpccnt[NFSPROC_READ]++;
 1116                 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz;
 1117                 nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3);
 1118                 nfsm_fhtom(vp, v3);
 1119                 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3);
 1120                 if (v3) {
 1121                         txdr_hyper(uiop->uio_offset, tl);
 1122                         *(tl + 2) = txdr_unsigned(len);
 1123                 } else {
 1124                         *tl++ = txdr_unsigned(uiop->uio_offset);
 1125                         *tl++ = txdr_unsigned(len);
 1126                         *tl = 0;
 1127                 }
 1128                 nfsm_request(vp, NFSPROC_READ, uiop->uio_procp, cred);
 1129                 if (v3) {
 1130                         nfsm_postop_attr(vp, attrflag);
 1131                         if (error) {
 1132                                 m_freem(mrep);
 1133                                 goto nfsmout;
 1134                         }
 1135                         nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1136                         eof = fxdr_unsigned(int, *(tl + 1));
 1137                 } else
 1138                         nfsm_loadattr(vp, (struct vattr *)0);
 1139                 nfsm_strsiz(retlen, nmp->nm_rsize);
 1140                 nfsm_mtouio(uiop, retlen);
 1141                 m_freem(mrep);
 1142                 tsiz -= retlen;
 1143                 if (v3) {
 1144                         if (eof || retlen == 0) {
 1145                                 tsiz = 0;
 1146                         }
 1147                 } else if (retlen < len) {
 1148                         tsiz = 0;
 1149                 }
 1150         }
 1151 nfsmout:
 1152         return (error);
 1153 }
 1154 
 1155 /*
 1156  * nfs write call
 1157  */
 1158 int
 1159 nfs_writerpc(vp, uiop, cred, iomode, must_commit)
 1160         register struct vnode *vp;
 1161         register struct uio *uiop;
 1162         struct ucred *cred;
 1163         int *iomode, *must_commit;
 1164 {
 1165         register u_int32_t *tl;
 1166         register caddr_t cp;
 1167         register int32_t t1, t2, backup;
 1168         caddr_t bpos, dpos, cp2;
 1169         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 1170         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 1171         int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit;
 1172         int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC;
 1173 
 1174 #ifndef DIAGNOSTIC
 1175         if (uiop->uio_iovcnt != 1)
 1176                 panic("nfs: writerpc iovcnt > 1");
 1177 #endif
 1178         *must_commit = 0;
 1179         tsiz = uiop->uio_resid;
 1180         if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
 1181                 return (EFBIG);
 1182         while (tsiz > 0) {
 1183                 nfsstats.rpccnt[NFSPROC_WRITE]++;
 1184                 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz;
 1185                 nfsm_reqhead(vp, NFSPROC_WRITE,
 1186                         NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len));
 1187                 nfsm_fhtom(vp, v3);
 1188                 if (v3) {
 1189                         nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
 1190                         txdr_hyper(uiop->uio_offset, tl);
 1191                         tl += 2;
 1192                         *tl++ = txdr_unsigned(len);
 1193                         *tl++ = txdr_unsigned(*iomode);
 1194                         *tl = txdr_unsigned(len);
 1195                 } else {
 1196                         register u_int32_t x;
 1197 
 1198                         nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
 1199                         /* Set both "begin" and "current" to non-garbage. */
 1200                         x = txdr_unsigned((u_int32_t)uiop->uio_offset);
 1201                         *tl++ = x;      /* "begin offset" */
 1202                         *tl++ = x;      /* "current offset" */
 1203                         x = txdr_unsigned(len);
 1204                         *tl++ = x;      /* total to this offset */
 1205                         *tl = x;        /* size of this write */
 1206                 }
 1207                 nfsm_uiotom(uiop, len);
 1208                 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_procp, cred);
 1209                 if (v3) {
 1210                         wccflag = NFSV3_WCCCHK;
 1211                         nfsm_wcc_data(vp, wccflag);
 1212                         if (!error) {
 1213                                 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED
 1214                                         + NFSX_V3WRITEVERF);
 1215                                 rlen = fxdr_unsigned(int, *tl++);
 1216                                 if (rlen == 0) {
 1217                                         error = NFSERR_IO;
 1218                                         m_freem(mrep);
 1219                                         break;
 1220                                 } else if (rlen < len) {
 1221                                         backup = len - rlen;
 1222                                         uiop->uio_iov->iov_base -= backup;
 1223                                         uiop->uio_iov->iov_len += backup;
 1224                                         uiop->uio_offset -= backup;
 1225                                         uiop->uio_resid += backup;
 1226                                         len = rlen;
 1227                                 }
 1228                                 commit = fxdr_unsigned(int, *tl++);
 1229 
 1230                                 /*
 1231                                  * Return the lowest committment level
 1232                                  * obtained by any of the RPCs.
 1233                                  */
 1234                                 if (committed == NFSV3WRITE_FILESYNC)
 1235                                         committed = commit;
 1236                                 else if (committed == NFSV3WRITE_DATASYNC &&
 1237                                         commit == NFSV3WRITE_UNSTABLE)
 1238                                         committed = commit;
 1239                                 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){
 1240                                     bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
 1241                                         NFSX_V3WRITEVERF);
 1242                                     nmp->nm_state |= NFSSTA_HASWRITEVERF;
 1243                                 } else if (bcmp((caddr_t)tl,
 1244                                     (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) {
 1245                                     *must_commit = 1;
 1246                                     bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
 1247                                         NFSX_V3WRITEVERF);
 1248                                 }
 1249                         }
 1250                 } else
 1251                     nfsm_loadattr(vp, (struct vattr *)0);
 1252                 if (wccflag)
 1253                     VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime.tv_sec;
 1254                 m_freem(mrep);
 1255                 if (error)
 1256                         break;
 1257                 tsiz -= len;
 1258         }
 1259 nfsmout:
 1260         if (vp->v_mount->mnt_flag & MNT_ASYNC)
 1261                 committed = NFSV3WRITE_FILESYNC;
 1262         *iomode = committed;
 1263         if (error)
 1264                 uiop->uio_resid = tsiz;
 1265         return (error);
 1266 }
 1267 
 1268 /*
 1269  * nfs mknod rpc
 1270  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1271  * mode set to specify the file type and the size field for rdev.
 1272  */
 1273 static int
 1274 nfs_mknodrpc(dvp, vpp, cnp, vap)
 1275         register struct vnode *dvp;
 1276         register struct vnode **vpp;
 1277         register struct componentname *cnp;
 1278         register struct vattr *vap;
 1279 {
 1280         register struct nfsv2_sattr *sp;
 1281         register u_int32_t *tl;
 1282         register caddr_t cp;
 1283         register int32_t t1, t2;
 1284         struct vnode *newvp = (struct vnode *)0;
 1285         struct nfsnode *np = (struct nfsnode *)0;
 1286         struct vattr vattr;
 1287         char *cp2;
 1288         caddr_t bpos, dpos;
 1289         int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
 1290         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 1291         u_int32_t rdev;
 1292         int v3 = NFS_ISV3(dvp);
 1293 
 1294         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1295                 rdev = txdr_unsigned(vap->va_rdev);
 1296         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1297                 rdev = nfs_xdrneg1;
 1298         else {
 1299                 return (EOPNOTSUPP);
 1300         }
 1301         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_proc)) != 0) {
 1302                 return (error);
 1303         }
 1304         nfsstats.rpccnt[NFSPROC_MKNOD]++;
 1305         nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED +
 1306                 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
 1307         nfsm_fhtom(dvp, v3);
 1308         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1309         if (v3) {
 1310                 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
 1311                 *tl++ = vtonfsv3_type(vap->va_type);
 1312                 nfsm_v3attrbuild(vap, FALSE);
 1313                 if (vap->va_type == VCHR || vap->va_type == VBLK) {
 1314                         nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1315                         *tl++ = txdr_unsigned(umajor(vap->va_rdev));
 1316                         *tl = txdr_unsigned(uminor(vap->va_rdev));
 1317                 }
 1318         } else {
 1319                 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 1320                 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
 1321                 sp->sa_uid = nfs_xdrneg1;
 1322                 sp->sa_gid = nfs_xdrneg1;
 1323                 sp->sa_size = rdev;
 1324                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 1325                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 1326         }
 1327         nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_proc, cnp->cn_cred);
 1328         if (!error) {
 1329                 nfsm_mtofh(dvp, newvp, v3, gotvp);
 1330                 if (!gotvp) {
 1331                         if (newvp) {
 1332                                 vput(newvp);
 1333                                 newvp = (struct vnode *)0;
 1334                         }
 1335                         error = nfs_lookitup(dvp, cnp->cn_nameptr,
 1336                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc, &np);
 1337                         if (!error)
 1338                                 newvp = NFSTOV(np);
 1339                 }
 1340         }
 1341         if (v3)
 1342                 nfsm_wcc_data(dvp, wccflag);
 1343         nfsm_reqdone;
 1344         if (error) {
 1345                 if (newvp)
 1346                         vput(newvp);
 1347         } else {
 1348                 if (cnp->cn_flags & MAKEENTRY)
 1349                         cache_enter(dvp, newvp, cnp);
 1350                 *vpp = newvp;
 1351         }
 1352         VTONFS(dvp)->n_flag |= NMODIFIED;
 1353         if (!wccflag)
 1354                 VTONFS(dvp)->n_attrstamp = 0;
 1355         return (error);
 1356 }
 1357 
 1358 /*
 1359  * nfs mknod vop
 1360  * just call nfs_mknodrpc() to do the work.
 1361  */
 1362 /* ARGSUSED */
 1363 static int
 1364 nfs_mknod(ap)
 1365         struct vop_mknod_args /* {
 1366                 struct vnode *a_dvp;
 1367                 struct vnode **a_vpp;
 1368                 struct componentname *a_cnp;
 1369                 struct vattr *a_vap;
 1370         } */ *ap;
 1371 {
 1372         return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap);
 1373 }
 1374 
 1375 static u_long create_verf;
 1376 /*
 1377  * nfs file create call
 1378  */
 1379 static int
 1380 nfs_create(ap)
 1381         struct vop_create_args /* {
 1382                 struct vnode *a_dvp;
 1383                 struct vnode **a_vpp;
 1384                 struct componentname *a_cnp;
 1385                 struct vattr *a_vap;
 1386         } */ *ap;
 1387 {
 1388         register struct vnode *dvp = ap->a_dvp;
 1389         register struct vattr *vap = ap->a_vap;
 1390         register struct componentname *cnp = ap->a_cnp;
 1391         register struct nfsv2_sattr *sp;
 1392         register u_int32_t *tl;
 1393         register caddr_t cp;
 1394         register int32_t t1, t2;
 1395         struct nfsnode *np = (struct nfsnode *)0;
 1396         struct vnode *newvp = (struct vnode *)0;
 1397         caddr_t bpos, dpos, cp2;
 1398         int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;
 1399         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 1400         struct vattr vattr;
 1401         int v3 = NFS_ISV3(dvp);
 1402 
 1403         /*
 1404          * Oops, not for me..
 1405          */
 1406         if (vap->va_type == VSOCK)
 1407                 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 1408 
 1409         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_proc)) != 0) {
 1410                 return (error);
 1411         }
 1412         if (vap->va_vaflags & VA_EXCLUSIVE)
 1413                 fmode |= O_EXCL;
 1414 again:
 1415         nfsstats.rpccnt[NFSPROC_CREATE]++;
 1416         nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED +
 1417                 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
 1418         nfsm_fhtom(dvp, v3);
 1419         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1420         if (v3) {
 1421                 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
 1422                 if (fmode & O_EXCL) {
 1423                         *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
 1424                         nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF);
 1425 #ifdef INET
 1426                         if (!TAILQ_EMPTY(&in_ifaddrhead))
 1427                                 *tl++ = IA_SIN(in_ifaddrhead.tqh_first)->sin_addr.s_addr;
 1428                         else
 1429 #endif
 1430                                 *tl++ = create_verf;
 1431                         *tl = ++create_verf;
 1432                 } else {
 1433                         *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED);
 1434                         nfsm_v3attrbuild(vap, FALSE);
 1435                 }
 1436         } else {
 1437                 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 1438                 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
 1439                 sp->sa_uid = nfs_xdrneg1;
 1440                 sp->sa_gid = nfs_xdrneg1;
 1441                 sp->sa_size = 0;
 1442                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 1443                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 1444         }
 1445         nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_proc, cnp->cn_cred);
 1446         if (!error) {
 1447                 nfsm_mtofh(dvp, newvp, v3, gotvp);
 1448                 if (!gotvp) {
 1449                         if (newvp) {
 1450                                 vput(newvp);
 1451                                 newvp = (struct vnode *)0;
 1452                         }
 1453                         error = nfs_lookitup(dvp, cnp->cn_nameptr,
 1454                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc, &np);
 1455                         if (!error)
 1456                                 newvp = NFSTOV(np);
 1457                 }
 1458         }
 1459         if (v3)
 1460                 nfsm_wcc_data(dvp, wccflag);
 1461         nfsm_reqdone;
 1462         if (error) {
 1463                 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) {
 1464                         fmode &= ~O_EXCL;
 1465                         goto again;
 1466                 }
 1467                 if (newvp)
 1468                         vput(newvp);
 1469         } else if (v3 && (fmode & O_EXCL)) {
 1470                 /*
 1471                  * We are normally called with only a partially initialized
 1472                  * VAP.  Since the NFSv3 spec says that server may use the
 1473                  * file attributes to store the verifier, the spec requires
 1474                  * us to do a SETATTR RPC. FreeBSD servers store the verifier
 1475                  * in atime, but we can't really assume that all servers will
 1476                  * so we ensure that our SETATTR sets both atime and mtime.
 1477                  */
 1478                 if (vap->va_mtime.tv_sec == VNOVAL)
 1479                         vfs_timestamp(&vap->va_mtime);
 1480                 if (vap->va_atime.tv_sec == VNOVAL)
 1481                         vap->va_atime = vap->va_mtime;
 1482                 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_proc);
 1483         }
 1484         if (!error) {
 1485                 if (cnp->cn_flags & MAKEENTRY)
 1486                         cache_enter(dvp, newvp, cnp);
 1487                 *ap->a_vpp = newvp;
 1488         }
 1489         VTONFS(dvp)->n_flag |= NMODIFIED;
 1490         if (!wccflag)
 1491                 VTONFS(dvp)->n_attrstamp = 0;
 1492         return (error);
 1493 }
 1494 
 1495 /*
 1496  * nfs file remove call
 1497  * To try and make nfs semantics closer to ufs semantics, a file that has
 1498  * other processes using the vnode is renamed instead of removed and then
 1499  * removed later on the last close.
 1500  * - If v_usecount > 1
 1501  *        If a rename is not already in the works
 1502  *           call nfs_sillyrename() to set it up
 1503  *     else
 1504  *        do the remove rpc
 1505  */
 1506 static int
 1507 nfs_remove(ap)
 1508         struct vop_remove_args /* {
 1509                 struct vnodeop_desc *a_desc;
 1510                 struct vnode * a_dvp;
 1511                 struct vnode * a_vp;
 1512                 struct componentname * a_cnp;
 1513         } */ *ap;
 1514 {
 1515         register struct vnode *vp = ap->a_vp;
 1516         register struct vnode *dvp = ap->a_dvp;
 1517         register struct componentname *cnp = ap->a_cnp;
 1518         register struct nfsnode *np = VTONFS(vp);
 1519         int error = 0;
 1520         struct vattr vattr;
 1521 
 1522 #ifndef DIAGNOSTIC
 1523         if ((cnp->cn_flags & HASBUF) == 0)
 1524                 panic("nfs_remove: no name");
 1525         if (vp->v_usecount < 1)
 1526                 panic("nfs_remove: bad v_usecount");
 1527 #endif
 1528         if (vp->v_type == VDIR)
 1529                 error = EPERM;
 1530         else if (vp->v_usecount == 1 || (np->n_sillyrename &&
 1531             VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_proc) == 0 &&
 1532             vattr.va_nlink > 1)) {
 1533                 /*
 1534                  * Purge the name cache so that the chance of a lookup for
 1535                  * the name succeeding while the remove is in progress is
 1536                  * minimized. Without node locking it can still happen, such
 1537                  * that an I/O op returns ESTALE, but since you get this if
 1538                  * another host removes the file..
 1539                  */
 1540                 cache_purge(vp);
 1541                 /*
 1542                  * throw away biocache buffers, mainly to avoid
 1543                  * unnecessary delayed writes later.
 1544                  */
 1545                 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, cnp->cn_proc, 1);
 1546                 /* Do the rpc */
 1547                 if (error != EINTR)
 1548                         error = nfs_removerpc(dvp, cnp->cn_nameptr,
 1549                                 cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc);
 1550                 /*
 1551                  * Kludge City: If the first reply to the remove rpc is lost..
 1552                  *   the reply to the retransmitted request will be ENOENT
 1553                  *   since the file was in fact removed
 1554                  *   Therefore, we cheat and return success.
 1555                  */
 1556                 if (error == ENOENT)
 1557                         error = 0;
 1558         } else if (!np->n_sillyrename)
 1559                 error = nfs_sillyrename(dvp, vp, cnp);
 1560         np->n_attrstamp = 0;
 1561         return (error);
 1562 }
 1563 
 1564 /*
 1565  * nfs file remove rpc called from nfs_inactive
 1566  */
 1567 int
 1568 nfs_removeit(sp)
 1569         register struct sillyrename *sp;
 1570 {
 1571 
 1572         /*
 1573          * Make sure that the directory vnode is still valid.
 1574          * XXX we should lock sp->s_dvp here.
 1575          */
 1576         if (sp->s_dvp->v_type == VBAD)
 1577                 return (0);
 1578         return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 1579                 (struct proc *)0));
 1580 }
 1581 
 1582 /*
 1583  * Nfs remove rpc, called from nfs_remove() and nfs_removeit().
 1584  */
 1585 static int
 1586 nfs_removerpc(dvp, name, namelen, cred, proc)
 1587         register struct vnode *dvp;
 1588         const char *name;
 1589         int namelen;
 1590         struct ucred *cred;
 1591         struct proc *proc;
 1592 {
 1593         register u_int32_t *tl;
 1594         register caddr_t cp;
 1595         register int32_t t1, t2;
 1596         caddr_t bpos, dpos, cp2;
 1597         int error = 0, wccflag = NFSV3_WCCRATTR;
 1598         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 1599         int v3 = NFS_ISV3(dvp);
 1600 
 1601         nfsstats.rpccnt[NFSPROC_REMOVE]++;
 1602         nfsm_reqhead(dvp, NFSPROC_REMOVE,
 1603                 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen));
 1604         nfsm_fhtom(dvp, v3);
 1605         nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
 1606         nfsm_request(dvp, NFSPROC_REMOVE, proc, cred);
 1607         if (v3)
 1608                 nfsm_wcc_data(dvp, wccflag);
 1609         nfsm_reqdone;
 1610         VTONFS(dvp)->n_flag |= NMODIFIED;
 1611         if (!wccflag)
 1612                 VTONFS(dvp)->n_attrstamp = 0;
 1613         return (error);
 1614 }
 1615 
 1616 /*
 1617  * nfs file rename call
 1618  */
 1619 static int
 1620 nfs_rename(ap)
 1621         struct vop_rename_args  /* {
 1622                 struct vnode *a_fdvp;
 1623                 struct vnode *a_fvp;
 1624                 struct componentname *a_fcnp;
 1625                 struct vnode *a_tdvp;
 1626                 struct vnode *a_tvp;
 1627                 struct componentname *a_tcnp;
 1628         } */ *ap;
 1629 {
 1630         register struct vnode *fvp = ap->a_fvp;
 1631         register struct vnode *tvp = ap->a_tvp;
 1632         register struct vnode *fdvp = ap->a_fdvp;
 1633         register struct vnode *tdvp = ap->a_tdvp;
 1634         register struct componentname *tcnp = ap->a_tcnp;
 1635         register struct componentname *fcnp = ap->a_fcnp;
 1636         int error;
 1637 
 1638 #ifndef DIAGNOSTIC
 1639         if ((tcnp->cn_flags & HASBUF) == 0 ||
 1640             (fcnp->cn_flags & HASBUF) == 0)
 1641                 panic("nfs_rename: no name");
 1642 #endif
 1643         /* Check for cross-device rename */
 1644         if ((fvp->v_mount != tdvp->v_mount) ||
 1645             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1646                 error = EXDEV;
 1647                 goto out;
 1648         }
 1649 
 1650         /*
 1651          * We have to flush B_DELWRI data prior to renaming
 1652          * the file.  If we don't, the delayed-write buffers
 1653          * can be flushed out later after the file has gone stale
 1654          * under NFSV3.  NFSV2 does not have this problem because
 1655          * ( as far as I can tell ) it flushes dirty buffers more
 1656          * often.
 1657          */
 1658 
 1659         VOP_FSYNC(fvp, fcnp->cn_cred, MNT_WAIT, fcnp->cn_proc);
 1660         if (tvp)
 1661             VOP_FSYNC(tvp, tcnp->cn_cred, MNT_WAIT, tcnp->cn_proc);
 1662 
 1663         /*
 1664          * If the tvp exists and is in use, sillyrename it before doing the
 1665          * rename of the new file over it.
 1666          * XXX Can't sillyrename a directory.
 1667          */
 1668         if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename &&
 1669                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1670                 vput(tvp);
 1671                 tvp = NULL;
 1672         }
 1673 
 1674         error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1675                 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1676                 tcnp->cn_proc);
 1677 
 1678         if (fvp->v_type == VDIR) {
 1679                 if (tvp != NULL && tvp->v_type == VDIR)
 1680                         cache_purge(tdvp);
 1681                 cache_purge(fdvp);
 1682         }
 1683 
 1684 out:
 1685         if (tdvp == tvp)
 1686                 vrele(tdvp);
 1687         else
 1688                 vput(tdvp);
 1689         if (tvp)
 1690                 vput(tvp);
 1691         vrele(fdvp);
 1692         vrele(fvp);
 1693         /*
 1694          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1695          */
 1696         if (error == ENOENT)
 1697                 error = 0;
 1698         return (error);
 1699 }
 1700 
 1701 /*
 1702  * nfs file rename rpc called from nfs_remove() above
 1703  */
 1704 static int
 1705 nfs_renameit(sdvp, scnp, sp)
 1706         struct vnode *sdvp;
 1707         struct componentname *scnp;
 1708         register struct sillyrename *sp;
 1709 {
 1710         return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen,
 1711                 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_proc));
 1712 }
 1713 
 1714 /*
 1715  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 1716  */
 1717 static int
 1718 nfs_renamerpc(fdvp, fnameptr, fnamelen, tdvp, tnameptr, tnamelen, cred, proc)
 1719         register struct vnode *fdvp;
 1720         const char *fnameptr;
 1721         int fnamelen;
 1722         register struct vnode *tdvp;
 1723         const char *tnameptr;
 1724         int tnamelen;
 1725         struct ucred *cred;
 1726         struct proc *proc;
 1727 {
 1728         register u_int32_t *tl;
 1729         register caddr_t cp;
 1730         register int32_t t1, t2;
 1731         caddr_t bpos, dpos, cp2;
 1732         int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
 1733         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 1734         int v3 = NFS_ISV3(fdvp);
 1735 
 1736         nfsstats.rpccnt[NFSPROC_RENAME]++;
 1737         nfsm_reqhead(fdvp, NFSPROC_RENAME,
 1738                 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) +
 1739                 nfsm_rndup(tnamelen));
 1740         nfsm_fhtom(fdvp, v3);
 1741         nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
 1742         nfsm_fhtom(tdvp, v3);
 1743         nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
 1744         nfsm_request(fdvp, NFSPROC_RENAME, proc, cred);
 1745         if (v3) {
 1746                 nfsm_wcc_data(fdvp, fwccflag);
 1747                 nfsm_wcc_data(tdvp, twccflag);
 1748         }
 1749         nfsm_reqdone;
 1750         VTONFS(fdvp)->n_flag |= NMODIFIED;
 1751         VTONFS(tdvp)->n_flag |= NMODIFIED;
 1752         if (!fwccflag)
 1753                 VTONFS(fdvp)->n_attrstamp = 0;
 1754         if (!twccflag)
 1755                 VTONFS(tdvp)->n_attrstamp = 0;
 1756         return (error);
 1757 }
 1758 
 1759 /*
 1760  * nfs hard link create call
 1761  */
 1762 static int
 1763 nfs_link(ap)
 1764         struct vop_link_args /* {
 1765                 struct vnode *a_tdvp;
 1766                 struct vnode *a_vp;
 1767                 struct componentname *a_cnp;
 1768         } */ *ap;
 1769 {
 1770         register struct vnode *vp = ap->a_vp;
 1771         register struct vnode *tdvp = ap->a_tdvp;
 1772         register struct componentname *cnp = ap->a_cnp;
 1773         register u_int32_t *tl;
 1774         register caddr_t cp;
 1775         register int32_t t1, t2;
 1776         caddr_t bpos, dpos, cp2;
 1777         int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
 1778         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 1779         int v3;
 1780 
 1781         if (vp->v_mount != tdvp->v_mount) {
 1782                 return (EXDEV);
 1783         }
 1784 
 1785         /*
 1786          * Push all writes to the server, so that the attribute cache
 1787          * doesn't get "out of sync" with the server.
 1788          * XXX There should be a better way!
 1789          */
 1790         VOP_FSYNC(vp, cnp->cn_cred, MNT_WAIT, cnp->cn_proc);
 1791 
 1792         v3 = NFS_ISV3(vp);
 1793         nfsstats.rpccnt[NFSPROC_LINK]++;
 1794         nfsm_reqhead(vp, NFSPROC_LINK,
 1795                 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
 1796         nfsm_fhtom(vp, v3);
 1797         nfsm_fhtom(tdvp, v3);
 1798         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1799         nfsm_request(vp, NFSPROC_LINK, cnp->cn_proc, cnp->cn_cred);
 1800         if (v3) {
 1801                 nfsm_postop_attr(vp, attrflag);
 1802                 nfsm_wcc_data(tdvp, wccflag);
 1803         }
 1804         nfsm_reqdone;
 1805         VTONFS(tdvp)->n_flag |= NMODIFIED;
 1806         if (!attrflag)
 1807                 VTONFS(vp)->n_attrstamp = 0;
 1808         if (!wccflag)
 1809                 VTONFS(tdvp)->n_attrstamp = 0;
 1810         /*
 1811          * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry.
 1812          */
 1813         if (error == EEXIST)
 1814                 error = 0;
 1815         return (error);
 1816 }
 1817 
 1818 /*
 1819  * nfs symbolic link create call
 1820  */
 1821 static int
 1822 nfs_symlink(ap)
 1823         struct vop_symlink_args /* {
 1824                 struct vnode *a_dvp;
 1825                 struct vnode **a_vpp;
 1826                 struct componentname *a_cnp;
 1827                 struct vattr *a_vap;
 1828                 char *a_target;
 1829         } */ *ap;
 1830 {
 1831         register struct vnode *dvp = ap->a_dvp;
 1832         register struct vattr *vap = ap->a_vap;
 1833         register struct componentname *cnp = ap->a_cnp;
 1834         register struct nfsv2_sattr *sp;
 1835         register u_int32_t *tl;
 1836         register caddr_t cp;
 1837         register int32_t t1, t2;
 1838         caddr_t bpos, dpos, cp2;
 1839         int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
 1840         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 1841         struct vnode *newvp = (struct vnode *)0;
 1842         int v3 = NFS_ISV3(dvp);
 1843 
 1844         nfsstats.rpccnt[NFSPROC_SYMLINK]++;
 1845         slen = strlen(ap->a_target);
 1846         nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED +
 1847             nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3));
 1848         nfsm_fhtom(dvp, v3);
 1849         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1850         if (v3) {
 1851                 nfsm_v3attrbuild(vap, FALSE);
 1852         }
 1853         nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN);
 1854         if (!v3) {
 1855                 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 1856                 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode);
 1857                 sp->sa_uid = nfs_xdrneg1;
 1858                 sp->sa_gid = nfs_xdrneg1;
 1859                 sp->sa_size = nfs_xdrneg1;
 1860                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 1861                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 1862         }
 1863 
 1864         /*
 1865          * Issue the NFS request and get the rpc response.
 1866          *
 1867          * Only NFSv3 responses returning an error of 0 actually return
 1868          * a file handle that can be converted into newvp without having
 1869          * to do an extra lookup rpc.
 1870          */
 1871         nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_proc, cnp->cn_cred);
 1872         if (v3) {
 1873                 if (error == 0)
 1874                         nfsm_mtofh(dvp, newvp, v3, gotvp);
 1875                 nfsm_wcc_data(dvp, wccflag);
 1876         }
 1877 
 1878         /*
 1879          * out code jumps -> here, mrep is also freed.
 1880          */
 1881 
 1882         nfsm_reqdone;
 1883 
 1884         /*
 1885          * If we get an EEXIST error, silently convert it to no-error
 1886          * in case of an NFS retry.
 1887          */
 1888         if (error == EEXIST)
 1889                 error = 0;
 1890 
 1891         /*
 1892          * If we do not have (or no longer have) an error, and we could
 1893          * not extract the newvp from the response due to the request being
 1894          * NFSv2 or the error being EEXIST.  We have to do a lookup in order
 1895          * to obtain a newvp to return.  
 1896          */
 1897         if (error == 0 && newvp == NULL) {
 1898                 struct nfsnode *np = NULL;
 1899 
 1900                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 1901                     cnp->cn_cred, cnp->cn_proc, &np);
 1902                 if (!error)
 1903                         newvp = NFSTOV(np);
 1904         }
 1905         if (error) {
 1906                 if (newvp)
 1907                         vput(newvp);
 1908         } else {
 1909                 *ap->a_vpp = newvp;
 1910         }
 1911         VTONFS(dvp)->n_flag |= NMODIFIED;
 1912         if (!wccflag)
 1913                 VTONFS(dvp)->n_attrstamp = 0;
 1914         return (error);
 1915 }
 1916 
 1917 /*
 1918  * nfs make dir call
 1919  */
 1920 static int
 1921 nfs_mkdir(ap)
 1922         struct vop_mkdir_args /* {
 1923                 struct vnode *a_dvp;
 1924                 struct vnode **a_vpp;
 1925                 struct componentname *a_cnp;
 1926                 struct vattr *a_vap;
 1927         } */ *ap;
 1928 {
 1929         register struct vnode *dvp = ap->a_dvp;
 1930         register struct vattr *vap = ap->a_vap;
 1931         register struct componentname *cnp = ap->a_cnp;
 1932         register struct nfsv2_sattr *sp;
 1933         register u_int32_t *tl;
 1934         register caddr_t cp;
 1935         register int32_t t1, t2;
 1936         register int len;
 1937         struct nfsnode *np = (struct nfsnode *)0;
 1938         struct vnode *newvp = (struct vnode *)0;
 1939         caddr_t bpos, dpos, cp2;
 1940         int error = 0, wccflag = NFSV3_WCCRATTR;
 1941         int gotvp = 0;
 1942         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 1943         struct vattr vattr;
 1944         int v3 = NFS_ISV3(dvp);
 1945 
 1946         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_proc)) != 0) {
 1947                 return (error);
 1948         }
 1949         len = cnp->cn_namelen;
 1950         nfsstats.rpccnt[NFSPROC_MKDIR]++;
 1951         nfsm_reqhead(dvp, NFSPROC_MKDIR,
 1952           NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3));
 1953         nfsm_fhtom(dvp, v3);
 1954         nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
 1955         if (v3) {
 1956                 nfsm_v3attrbuild(vap, FALSE);
 1957         } else {
 1958                 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 1959                 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode);
 1960                 sp->sa_uid = nfs_xdrneg1;
 1961                 sp->sa_gid = nfs_xdrneg1;
 1962                 sp->sa_size = nfs_xdrneg1;
 1963                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 1964                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 1965         }
 1966         nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_proc, cnp->cn_cred);
 1967         if (!error)
 1968                 nfsm_mtofh(dvp, newvp, v3, gotvp);
 1969         if (v3)
 1970                 nfsm_wcc_data(dvp, wccflag);
 1971         nfsm_reqdone;
 1972         VTONFS(dvp)->n_flag |= NMODIFIED;
 1973         if (!wccflag)
 1974                 VTONFS(dvp)->n_attrstamp = 0;
 1975         /*
 1976          * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry
 1977          * if we can succeed in looking up the directory.
 1978          */
 1979         if (error == EEXIST || (!error && !gotvp)) {
 1980                 if (newvp) {
 1981                         vrele(newvp);
 1982                         newvp = (struct vnode *)0;
 1983                 }
 1984                 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
 1985                         cnp->cn_proc, &np);
 1986                 if (!error) {
 1987                         newvp = NFSTOV(np);
 1988                         if (newvp->v_type != VDIR)
 1989                                 error = EEXIST;
 1990                 }
 1991         }
 1992         if (error) {
 1993                 if (newvp)
 1994                         vrele(newvp);
 1995         } else
 1996                 *ap->a_vpp = newvp;
 1997         return (error);
 1998 }
 1999 
 2000 /*
 2001  * nfs remove directory call
 2002  */
 2003 static int
 2004 nfs_rmdir(ap)
 2005         struct vop_rmdir_args /* {
 2006                 struct vnode *a_dvp;
 2007                 struct vnode *a_vp;
 2008                 struct componentname *a_cnp;
 2009         } */ *ap;
 2010 {
 2011         register struct vnode *vp = ap->a_vp;
 2012         register struct vnode *dvp = ap->a_dvp;
 2013         register struct componentname *cnp = ap->a_cnp;
 2014         register u_int32_t *tl;
 2015         register caddr_t cp;
 2016         register int32_t t1, t2;
 2017         caddr_t bpos, dpos, cp2;
 2018         int error = 0, wccflag = NFSV3_WCCRATTR;
 2019         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 2020         int v3 = NFS_ISV3(dvp);
 2021 
 2022         if (dvp == vp)
 2023                 return (EINVAL);
 2024         nfsstats.rpccnt[NFSPROC_RMDIR]++;
 2025         nfsm_reqhead(dvp, NFSPROC_RMDIR,
 2026                 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
 2027         nfsm_fhtom(dvp, v3);
 2028         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 2029         nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_proc, cnp->cn_cred);
 2030         if (v3)
 2031                 nfsm_wcc_data(dvp, wccflag);
 2032         nfsm_reqdone;
 2033         VTONFS(dvp)->n_flag |= NMODIFIED;
 2034         if (!wccflag)
 2035                 VTONFS(dvp)->n_attrstamp = 0;
 2036         cache_purge(dvp);
 2037         cache_purge(vp);
 2038         /*
 2039          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 2040          */
 2041         if (error == ENOENT)
 2042                 error = 0;
 2043         return (error);
 2044 }
 2045 
 2046 /*
 2047  * nfs readdir call
 2048  */
 2049 static int
 2050 nfs_readdir(ap)
 2051         struct vop_readdir_args /* {
 2052                 struct vnode *a_vp;
 2053                 struct uio *a_uio;
 2054                 struct ucred *a_cred;
 2055         } */ *ap;
 2056 {
 2057         register struct vnode *vp = ap->a_vp;
 2058         register struct nfsnode *np = VTONFS(vp);
 2059         register struct uio *uio = ap->a_uio;
 2060         int tresid, error;
 2061         struct vattr vattr;
 2062 
 2063         if (vp->v_type != VDIR)
 2064                 return (EPERM);
 2065         /*
 2066          * First, check for hit on the EOF offset cache
 2067          */
 2068         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 2069             (np->n_flag & NMODIFIED) == 0) {
 2070                 if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) {
 2071                         if (NQNFS_CKCACHABLE(vp, ND_READ)) {
 2072                                 nfsstats.direofcache_hits++;
 2073                                 return (0);
 2074                         }
 2075                 } else if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_procp) == 0 &&
 2076                         np->n_mtime == vattr.va_mtime.tv_sec) {
 2077                         nfsstats.direofcache_hits++;
 2078                         return (0);
 2079                 }
 2080         }
 2081 
 2082         /*
 2083          * Call nfs_bioread() to do the real work.
 2084          */
 2085         tresid = uio->uio_resid;
 2086         error = nfs_bioread(vp, uio, 0, ap->a_cred);
 2087 
 2088         if (!error && uio->uio_resid == tresid)
 2089                 nfsstats.direofcache_misses++;
 2090         return (error);
 2091 }
 2092 
 2093 /*
 2094  * Readdir rpc call.
 2095  * Called from below the buffer cache by nfs_doio().
 2096  */
 2097 int
 2098 nfs_readdirrpc(vp, uiop, cred)
 2099         struct vnode *vp;
 2100         register struct uio *uiop;
 2101         struct ucred *cred;
 2102 
 2103 {
 2104         register int len, left;
 2105         register struct dirent *dp = NULL;
 2106         register u_int32_t *tl;
 2107         register caddr_t cp;
 2108         register int32_t t1, t2;
 2109         register nfsuint64 *cookiep;
 2110         caddr_t bpos, dpos, cp2;
 2111         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 2112         nfsuint64 cookie;
 2113         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2114         struct nfsnode *dnp = VTONFS(vp);
 2115         u_quad_t fileno;
 2116         int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1;
 2117         int attrflag;
 2118         int v3 = NFS_ISV3(vp);
 2119 
 2120 #ifndef DIAGNOSTIC
 2121         if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
 2122                 (uiop->uio_resid & (DIRBLKSIZ - 1)))
 2123                 panic("nfs readdirrpc bad uio");
 2124 #endif
 2125 
 2126         /*
 2127          * If there is no cookie, assume directory was stale.
 2128          */
 2129         cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
 2130         if (cookiep)
 2131                 cookie = *cookiep;
 2132         else
 2133                 return (NFSERR_BAD_COOKIE);
 2134         /*
 2135          * Loop around doing readdir rpc's of size nm_readdirsize
 2136          * truncated to a multiple of DIRBLKSIZ.
 2137          * The stopping criteria is EOF or buffer full.
 2138          */
 2139         while (more_dirs && bigenough) {
 2140                 nfsstats.rpccnt[NFSPROC_READDIR]++;
 2141                 nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) +
 2142                         NFSX_READDIR(v3));
 2143                 nfsm_fhtom(vp, v3);
 2144                 if (v3) {
 2145                         nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
 2146                         *tl++ = cookie.nfsuquad[0];
 2147                         *tl++ = cookie.nfsuquad[1];
 2148                         *tl++ = dnp->n_cookieverf.nfsuquad[0];
 2149                         *tl++ = dnp->n_cookieverf.nfsuquad[1];
 2150                 } else {
 2151                         nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2152                         *tl++ = cookie.nfsuquad[0];
 2153                 }
 2154                 *tl = txdr_unsigned(nmp->nm_readdirsize);
 2155                 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_procp, cred);
 2156                 if (v3) {
 2157                         nfsm_postop_attr(vp, attrflag);
 2158                         if (!error) {
 2159                                 nfsm_dissect(tl, u_int32_t *,
 2160                                     2 * NFSX_UNSIGNED);
 2161                                 dnp->n_cookieverf.nfsuquad[0] = *tl++;
 2162                                 dnp->n_cookieverf.nfsuquad[1] = *tl;
 2163                         } else {
 2164                                 m_freem(mrep);
 2165                                 goto nfsmout;
 2166                         }
 2167                 }
 2168                 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 2169                 more_dirs = fxdr_unsigned(int, *tl);
 2170         
 2171                 /* loop thru the dir entries, doctoring them to 4bsd form */
 2172                 while (more_dirs && bigenough) {
 2173                         if (v3) {
 2174                                 nfsm_dissect(tl, u_int32_t *,
 2175                                     3 * NFSX_UNSIGNED);
 2176                                 fileno = fxdr_hyper(tl);
 2177                                 len = fxdr_unsigned(int, *(tl + 2));
 2178                         } else {
 2179                                 nfsm_dissect(tl, u_int32_t *,
 2180                                     2 * NFSX_UNSIGNED);
 2181                                 fileno = fxdr_unsigned(u_quad_t, *tl++);
 2182                                 len = fxdr_unsigned(int, *tl);
 2183                         }
 2184                         if (len <= 0 || len > NFS_MAXNAMLEN) {
 2185                                 error = EBADRPC;
 2186                                 m_freem(mrep);
 2187                                 goto nfsmout;
 2188                         }
 2189                         tlen = nfsm_rndup(len);
 2190                         if (tlen == len)
 2191                                 tlen += 4;      /* To ensure null termination */
 2192                         left = DIRBLKSIZ - blksiz;
 2193                         if ((tlen + DIRHDSIZ) > left) {
 2194                                 dp->d_reclen += left;
 2195                                 uiop->uio_iov->iov_base += left;
 2196                                 uiop->uio_iov->iov_len -= left;
 2197                                 uiop->uio_offset += left;
 2198                                 uiop->uio_resid -= left;
 2199                                 blksiz = 0;
 2200                         }
 2201                         if ((tlen + DIRHDSIZ) > uiop->uio_resid)
 2202                                 bigenough = 0;
 2203                         if (bigenough) {
 2204                                 dp = (struct dirent *)uiop->uio_iov->iov_base;
 2205                                 dp->d_fileno = (int)fileno;
 2206                                 dp->d_namlen = len;
 2207                                 dp->d_reclen = tlen + DIRHDSIZ;
 2208                                 dp->d_type = DT_UNKNOWN;
 2209                                 blksiz += dp->d_reclen;
 2210                                 if (blksiz == DIRBLKSIZ)
 2211                                         blksiz = 0;
 2212                                 uiop->uio_offset += DIRHDSIZ;
 2213                                 uiop->uio_resid -= DIRHDSIZ;
 2214                                 uiop->uio_iov->iov_base += DIRHDSIZ;
 2215                                 uiop->uio_iov->iov_len -= DIRHDSIZ;
 2216                                 nfsm_mtouio(uiop, len);
 2217                                 cp = uiop->uio_iov->iov_base;
 2218                                 tlen -= len;
 2219                                 *cp = '\0';     /* null terminate */
 2220                                 uiop->uio_iov->iov_base += tlen;
 2221                                 uiop->uio_iov->iov_len -= tlen;
 2222                                 uiop->uio_offset += tlen;
 2223                                 uiop->uio_resid -= tlen;
 2224                         } else
 2225                                 nfsm_adv(nfsm_rndup(len));
 2226                         if (v3) {
 2227                                 nfsm_dissect(tl, u_int32_t *,
 2228                                     3 * NFSX_UNSIGNED);
 2229                         } else {
 2230                                 nfsm_dissect(tl, u_int32_t *,
 2231                                     2 * NFSX_UNSIGNED);
 2232                         }
 2233                         if (bigenough) {
 2234                                 cookie.nfsuquad[0] = *tl++;
 2235                                 if (v3)
 2236                                         cookie.nfsuquad[1] = *tl++;
 2237                         } else if (v3)
 2238                                 tl += 2;
 2239                         else
 2240                                 tl++;
 2241                         more_dirs = fxdr_unsigned(int, *tl);
 2242                 }
 2243                 /*
 2244                  * If at end of rpc data, get the eof boolean
 2245                  */
 2246                 if (!more_dirs) {
 2247                         nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 2248                         more_dirs = (fxdr_unsigned(int, *tl) == 0);
 2249                 }
 2250                 m_freem(mrep);
 2251         }
 2252         /*
 2253          * Fill last record, iff any, out to a multiple of DIRBLKSIZ
 2254          * by increasing d_reclen for the last record.
 2255          */
 2256         if (blksiz > 0) {
 2257                 left = DIRBLKSIZ - blksiz;
 2258                 dp->d_reclen += left;
 2259                 uiop->uio_iov->iov_base += left;
 2260                 uiop->uio_iov->iov_len -= left;
 2261                 uiop->uio_offset += left;
 2262                 uiop->uio_resid -= left;
 2263         }
 2264 
 2265         /*
 2266          * We are now either at the end of the directory or have filled the
 2267          * block.
 2268          */
 2269         if (bigenough)
 2270                 dnp->n_direofoffset = uiop->uio_offset;
 2271         else {
 2272                 if (uiop->uio_resid > 0)
 2273                         printf("EEK! readdirrpc resid > 0\n");
 2274                 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
 2275                 *cookiep = cookie;
 2276         }
 2277 nfsmout:
 2278         return (error);
 2279 }
 2280 
 2281 /*
 2282  * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc().
 2283  */
 2284 int
 2285 nfs_readdirplusrpc(vp, uiop, cred)
 2286         struct vnode *vp;
 2287         register struct uio *uiop;
 2288         struct ucred *cred;
 2289 {
 2290         register int len, left;
 2291         register struct dirent *dp;
 2292         register u_int32_t *tl;
 2293         register caddr_t cp;
 2294         register int32_t t1, t2;
 2295         register struct vnode *newvp;
 2296         register nfsuint64 *cookiep;
 2297         caddr_t bpos, dpos, cp2, dpossav1, dpossav2;
 2298         struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2;
 2299         struct nameidata nami, *ndp = &nami;
 2300         struct componentname *cnp = &ndp->ni_cnd;
 2301         nfsuint64 cookie;
 2302         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2303         struct nfsnode *dnp = VTONFS(vp), *np;
 2304         nfsfh_t *fhp;
 2305         u_quad_t fileno;
 2306         int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i;
 2307         int attrflag, fhsize;
 2308 
 2309 #ifndef nolint
 2310         dp = (struct dirent *)0;
 2311 #endif
 2312 #ifndef DIAGNOSTIC
 2313         if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
 2314                 (uiop->uio_resid & (DIRBLKSIZ - 1)))
 2315                 panic("nfs readdirplusrpc bad uio");
 2316 #endif
 2317         ndp->ni_dvp = vp;
 2318         newvp = NULLVP;
 2319 
 2320         /*
 2321          * If there is no cookie, assume directory was stale.
 2322          */
 2323         cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
 2324         if (cookiep)
 2325                 cookie = *cookiep;
 2326         else
 2327                 return (NFSERR_BAD_COOKIE);
 2328         /*
 2329          * Loop around doing readdir rpc's of size nm_readdirsize
 2330          * truncated to a multiple of DIRBLKSIZ.
 2331          * The stopping criteria is EOF or buffer full.
 2332          */
 2333         while (more_dirs && bigenough) {
 2334                 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
 2335                 nfsm_reqhead(vp, NFSPROC_READDIRPLUS,
 2336                         NFSX_FH(1) + 6 * NFSX_UNSIGNED);
 2337                 nfsm_fhtom(vp, 1);
 2338                 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
 2339                 *tl++ = cookie.nfsuquad[0];
 2340                 *tl++ = cookie.nfsuquad[1];
 2341                 *tl++ = dnp->n_cookieverf.nfsuquad[0];
 2342                 *tl++ = dnp->n_cookieverf.nfsuquad[1];
 2343                 *tl++ = txdr_unsigned(nmp->nm_readdirsize);
 2344                 *tl = txdr_unsigned(nmp->nm_rsize);
 2345                 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_procp, cred);
 2346                 nfsm_postop_attr(vp, attrflag);
 2347                 if (error) {
 2348                         m_freem(mrep);
 2349                         goto nfsmout;
 2350                 }
 2351                 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2352                 dnp->n_cookieverf.nfsuquad[0] = *tl++;
 2353                 dnp->n_cookieverf.nfsuquad[1] = *tl++;
 2354                 more_dirs = fxdr_unsigned(int, *tl);
 2355 
 2356                 /* loop thru the dir entries, doctoring them to 4bsd form */
 2357                 while (more_dirs && bigenough) {
 2358                         nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2359                         fileno = fxdr_hyper(tl);
 2360                         len = fxdr_unsigned(int, *(tl + 2));
 2361                         if (len <= 0 || len > NFS_MAXNAMLEN) {
 2362                                 error = EBADRPC;
 2363                                 m_freem(mrep);
 2364                                 goto nfsmout;
 2365                         }
 2366                         tlen = nfsm_rndup(len);
 2367                         if (tlen == len)
 2368                                 tlen += 4;      /* To ensure null termination*/
 2369                         left = DIRBLKSIZ - blksiz;
 2370                         if ((tlen + DIRHDSIZ) > left) {
 2371                                 dp->d_reclen += left;
 2372                                 uiop->uio_iov->iov_base += left;
 2373                                 uiop->uio_iov->iov_len -= left;
 2374                                 uiop->uio_offset += left;
 2375                                 uiop->uio_resid -= left;
 2376                                 blksiz = 0;
 2377                         }
 2378                         if ((tlen + DIRHDSIZ) > uiop->uio_resid)
 2379                                 bigenough = 0;
 2380                         if (bigenough) {
 2381                                 dp = (struct dirent *)uiop->uio_iov->iov_base;
 2382                                 dp->d_fileno = (int)fileno;
 2383                                 dp->d_namlen = len;
 2384                                 dp->d_reclen = tlen + DIRHDSIZ;
 2385                                 dp->d_type = DT_UNKNOWN;
 2386                                 blksiz += dp->d_reclen;
 2387                                 if (blksiz == DIRBLKSIZ)
 2388                                         blksiz = 0;
 2389                                 uiop->uio_offset += DIRHDSIZ;
 2390                                 uiop->uio_resid -= DIRHDSIZ;
 2391                                 uiop->uio_iov->iov_base += DIRHDSIZ;
 2392                                 uiop->uio_iov->iov_len -= DIRHDSIZ;
 2393                                 cnp->cn_nameptr = uiop->uio_iov->iov_base;
 2394                                 cnp->cn_namelen = len;
 2395                                 nfsm_mtouio(uiop, len);
 2396                                 cp = uiop->uio_iov->iov_base;
 2397                                 tlen -= len;
 2398                                 *cp = '\0';
 2399                                 uiop->uio_iov->iov_base += tlen;
 2400                                 uiop->uio_iov->iov_len -= tlen;
 2401                                 uiop->uio_offset += tlen;
 2402                                 uiop->uio_resid -= tlen;
 2403                         } else
 2404                                 nfsm_adv(nfsm_rndup(len));
 2405                         nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2406                         if (bigenough) {
 2407                                 cookie.nfsuquad[0] = *tl++;
 2408                                 cookie.nfsuquad[1] = *tl++;
 2409                         } else
 2410                                 tl += 2;
 2411 
 2412                         /*
 2413                          * Since the attributes are before the file handle
 2414                          * (sigh), we must skip over the attributes and then
 2415                          * come back and get them.
 2416                          */
 2417                         attrflag = fxdr_unsigned(int, *tl);
 2418                         if (attrflag) {
 2419                             dpossav1 = dpos;
 2420                             mdsav1 = md;
 2421                             nfsm_adv(NFSX_V3FATTR);
 2422                             nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 2423                             doit = fxdr_unsigned(int, *tl);
 2424                             if (doit) {
 2425                                 nfsm_getfh(fhp, fhsize, 1);
 2426                                 if (NFS_CMPFH(dnp, fhp, fhsize)) {
 2427                                     VREF(vp);
 2428                                     newvp = vp;
 2429                                     np = dnp;
 2430                                 } else {
 2431                                     error = nfs_nget(vp->v_mount, fhp,
 2432                                         fhsize, &np);
 2433                                     if (error)
 2434                                         doit = 0;
 2435                                     else
 2436                                         newvp = NFSTOV(np);
 2437                                 }
 2438                             }
 2439                             if (doit && bigenough) {
 2440                                 dpossav2 = dpos;
 2441                                 dpos = dpossav1;
 2442                                 mdsav2 = md;
 2443                                 md = mdsav1;
 2444                                 nfsm_loadattr(newvp, (struct vattr *)0);
 2445                                 dpos = dpossav2;
 2446                                 md = mdsav2;
 2447                                 dp->d_type =
 2448                                     IFTODT(VTTOIF(np->n_vattr.va_type));
 2449                                 ndp->ni_vp = newvp;
 2450                                 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp);
 2451                             }
 2452                         } else {
 2453                             /* Just skip over the file handle */
 2454                             nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 2455                             i = fxdr_unsigned(int, *tl);
 2456                             nfsm_adv(nfsm_rndup(i));
 2457                         }
 2458                         if (newvp != NULLVP) {
 2459                             if (newvp == vp)
 2460                                 vrele(newvp);
 2461                             else
 2462                                 vput(newvp);
 2463                             newvp = NULLVP;
 2464                         }
 2465                         nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 2466                         more_dirs = fxdr_unsigned(int, *tl);
 2467                 }
 2468                 /*
 2469                  * If at end of rpc data, get the eof boolean
 2470                  */
 2471                 if (!more_dirs) {
 2472                         nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 2473                         more_dirs = (fxdr_unsigned(int, *tl) == 0);
 2474                 }
 2475                 m_freem(mrep);
 2476         }
 2477         /*
 2478          * Fill last record, iff any, out to a multiple of DIRBLKSIZ
 2479          * by increasing d_reclen for the last record.
 2480          */
 2481         if (blksiz > 0) {
 2482                 left = DIRBLKSIZ - blksiz;
 2483                 dp->d_reclen += left;
 2484                 uiop->uio_iov->iov_base += left;
 2485                 uiop->uio_iov->iov_len -= left;
 2486                 uiop->uio_offset += left;
 2487                 uiop->uio_resid -= left;
 2488         }
 2489 
 2490         /*
 2491          * We are now either at the end of the directory or have filled the
 2492          * block.
 2493          */
 2494         if (bigenough)
 2495                 dnp->n_direofoffset = uiop->uio_offset;
 2496         else {
 2497                 if (uiop->uio_resid > 0)
 2498                         printf("EEK! readdirplusrpc resid > 0\n");
 2499                 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
 2500                 *cookiep = cookie;
 2501         }
 2502 nfsmout:
 2503         if (newvp != NULLVP) {
 2504                 if (newvp == vp)
 2505                         vrele(newvp);
 2506                 else
 2507                         vput(newvp);
 2508                 newvp = NULLVP;
 2509         }
 2510         return (error);
 2511 }
 2512 
 2513 /*
 2514  * Silly rename. To make the NFS filesystem that is stateless look a little
 2515  * more like the "ufs" a remove of an active vnode is translated to a rename
 2516  * to a funny looking filename that is removed by nfs_inactive on the
 2517  * nfsnode. There is the potential for another process on a different client
 2518  * to create the same funny name between the nfs_lookitup() fails and the
 2519  * nfs_rename() completes, but...
 2520  */
 2521 static int
 2522 nfs_sillyrename(dvp, vp, cnp)
 2523         struct vnode *dvp, *vp;
 2524         struct componentname *cnp;
 2525 {
 2526         register struct sillyrename *sp;
 2527         struct nfsnode *np;
 2528         int error;
 2529         short pid;
 2530 
 2531         cache_purge(dvp);
 2532         np = VTONFS(vp);
 2533 #ifndef DIAGNOSTIC
 2534         if (vp->v_type == VDIR)
 2535                 panic("nfs: sillyrename dir");
 2536 #endif
 2537         MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
 2538                 M_NFSREQ, M_WAITOK);
 2539         sp->s_cred = crdup(cnp->cn_cred);
 2540         sp->s_dvp = dvp;
 2541         VREF(dvp);
 2542 
 2543         /* Fudge together a funny name */
 2544         pid = cnp->cn_proc->p_pid;
 2545         sp->s_namlen = sprintf(sp->s_name, ".nfsA%04x4.4", pid);
 2546 
 2547         /* Try lookitups until we get one that isn't there */
 2548         while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2549                 cnp->cn_proc, (struct nfsnode **)0) == 0) {
 2550                 sp->s_name[4]++;
 2551                 if (sp->s_name[4] > 'z') {
 2552                         error = EINVAL;
 2553                         goto bad;
 2554                 }
 2555         }
 2556         error = nfs_renameit(dvp, cnp, sp);
 2557         if (error)
 2558                 goto bad;
 2559         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2560                 cnp->cn_proc, &np);
 2561         np->n_sillyrename = sp;
 2562         return (0);
 2563 bad:
 2564         vrele(sp->s_dvp);
 2565         crfree(sp->s_cred);
 2566         free((caddr_t)sp, M_NFSREQ);
 2567         return (error);
 2568 }
 2569 
 2570 /*
 2571  * Look up a file name and optionally either update the file handle or
 2572  * allocate an nfsnode, depending on the value of npp.
 2573  * npp == NULL  --> just do the lookup
 2574  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2575  *                      handled too
 2576  * *npp != NULL --> update the file handle in the vnode
 2577  */
 2578 static int
 2579 nfs_lookitup(dvp, name, len, cred, procp, npp)
 2580         register struct vnode *dvp;
 2581         const char *name;
 2582         int len;
 2583         struct ucred *cred;
 2584         struct proc *procp;
 2585         struct nfsnode **npp;
 2586 {
 2587         register u_int32_t *tl;
 2588         register caddr_t cp;
 2589         register int32_t t1, t2;
 2590         struct vnode *newvp = (struct vnode *)0;
 2591         struct nfsnode *np, *dnp = VTONFS(dvp);
 2592         caddr_t bpos, dpos, cp2;
 2593         int error = 0, fhlen, attrflag;
 2594         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 2595         nfsfh_t *nfhp;
 2596         int v3 = NFS_ISV3(dvp);
 2597 
 2598         nfsstats.rpccnt[NFSPROC_LOOKUP]++;
 2599         nfsm_reqhead(dvp, NFSPROC_LOOKUP,
 2600                 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
 2601         nfsm_fhtom(dvp, v3);
 2602         nfsm_strtom(name, len, NFS_MAXNAMLEN);
 2603         nfsm_request(dvp, NFSPROC_LOOKUP, procp, cred);
 2604         if (npp && !error) {
 2605                 nfsm_getfh(nfhp, fhlen, v3);
 2606                 if (*npp) {
 2607                     np = *npp;
 2608                     if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) {
 2609                         free((caddr_t)np->n_fhp, M_NFSBIGFH);
 2610                         np->n_fhp = &np->n_fh;
 2611                     } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH)
 2612                         np->n_fhp =(nfsfh_t *)malloc(fhlen,M_NFSBIGFH,M_WAITOK);
 2613                     bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen);
 2614                     np->n_fhsize = fhlen;
 2615                     newvp = NFSTOV(np);
 2616                 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
 2617                     VREF(dvp);
 2618                     newvp = dvp;
 2619                 } else {
 2620                     error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np);
 2621                     if (error) {
 2622                         m_freem(mrep);
 2623                         return (error);
 2624                     }
 2625                     newvp = NFSTOV(np);
 2626                 }
 2627                 if (v3) {
 2628                         nfsm_postop_attr(newvp, attrflag);
 2629                         if (!attrflag && *npp == NULL) {
 2630                                 m_freem(mrep);
 2631                                 if (newvp == dvp)
 2632                                         vrele(newvp);
 2633                                 else
 2634                                         vput(newvp);
 2635                                 return (ENOENT);
 2636                         }
 2637                 } else
 2638                         nfsm_loadattr(newvp, (struct vattr *)0);
 2639         }
 2640         nfsm_reqdone;
 2641         if (npp && *npp == NULL) {
 2642                 if (error) {
 2643                         if (newvp) {
 2644                                 if (newvp == dvp)
 2645                                         vrele(newvp);
 2646                                 else
 2647                                         vput(newvp);
 2648                         }
 2649                 } else
 2650                         *npp = np;
 2651         }
 2652         return (error);
 2653 }
 2654 
 2655 /*
 2656  * Nfs Version 3 commit rpc
 2657  */
 2658 int
 2659 nfs_commit(vp, offset, cnt, cred, procp)
 2660         struct vnode *vp;
 2661         u_quad_t offset;
 2662         int cnt;
 2663         struct ucred *cred;
 2664         struct proc *procp;
 2665 {
 2666         register caddr_t cp;
 2667         register u_int32_t *tl;
 2668         register int32_t t1, t2;
 2669         register struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2670         caddr_t bpos, dpos, cp2;
 2671         int error = 0, wccflag = NFSV3_WCCRATTR;
 2672         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
 2673         
 2674         if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0)
 2675                 return (0);
 2676         nfsstats.rpccnt[NFSPROC_COMMIT]++;
 2677         nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1));
 2678         nfsm_fhtom(vp, 1);
 2679         nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2680         txdr_hyper(offset, tl);
 2681         tl += 2;
 2682         *tl = txdr_unsigned(cnt);
 2683         nfsm_request(vp, NFSPROC_COMMIT, procp, cred);
 2684         nfsm_wcc_data(vp, wccflag);
 2685         if (!error) {
 2686                 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF);
 2687                 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl,
 2688                         NFSX_V3WRITEVERF)) {
 2689                         bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
 2690                                 NFSX_V3WRITEVERF);
 2691                         error = NFSERR_STALEWRITEVERF;
 2692                 }
 2693         }
 2694         nfsm_reqdone;
 2695         return (error);
 2696 }
 2697 
 2698 /*
 2699  * Kludge City..
 2700  * - make nfs_bmap() essentially a no-op that does no translation
 2701  * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc
 2702  *   (Maybe I could use the process's page mapping, but I was concerned that
 2703  *    Kernel Write might not be enabled and also figured copyout() would do
 2704  *    a lot more work than bcopy() and also it currently happens in the
 2705  *    context of the swapper process (2).
 2706  */
 2707 static int
 2708 nfs_bmap(ap)
 2709         struct vop_bmap_args /* {
 2710                 struct vnode *a_vp;
 2711                 daddr_t  a_bn;
 2712                 struct vnode **a_vpp;
 2713                 daddr_t *a_bnp;
 2714                 int *a_runp;
 2715                 int *a_runb;
 2716         } */ *ap;
 2717 {
 2718         register struct vnode *vp = ap->a_vp;
 2719 
 2720         if (ap->a_vpp != NULL)
 2721                 *ap->a_vpp = vp;
 2722         if (ap->a_bnp != NULL)
 2723                 *ap->a_bnp = ap->a_bn * btodb(vp->v_mount->mnt_stat.f_iosize);
 2724         if (ap->a_runp != NULL)
 2725                 *ap->a_runp = 0;
 2726         if (ap->a_runb != NULL)
 2727                 *ap->a_runb = 0;
 2728         return (0);
 2729 }
 2730 
 2731 /*
 2732  * Strategy routine.
 2733  * For async requests when nfsiod(s) are running, queue the request by
 2734  * calling nfs_asyncio(), otherwise just all nfs_doio() to do the
 2735  * request.
 2736  */
 2737 static int
 2738 nfs_strategy(ap)
 2739         struct vop_strategy_args *ap;
 2740 {
 2741         register struct buf *bp = ap->a_bp;
 2742         struct ucred *cr;
 2743         struct proc *p;
 2744         int error = 0;
 2745 
 2746         KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2747         KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp));
 2748 
 2749         if (bp->b_flags & B_PHYS)
 2750                 panic("nfs physio");
 2751 
 2752         if (bp->b_flags & B_ASYNC)
 2753                 p = (struct proc *)0;
 2754         else
 2755                 p = curproc;    /* XXX */
 2756 
 2757         if (bp->b_flags & B_READ)
 2758                 cr = bp->b_rcred;
 2759         else
 2760                 cr = bp->b_wcred;
 2761 
 2762         /*
 2763          * If the op is asynchronous and an i/o daemon is waiting
 2764          * queue the request, wake it up and wait for completion
 2765          * otherwise just do it ourselves.
 2766          */
 2767         if ((bp->b_flags & B_ASYNC) == 0 ||
 2768                 nfs_asyncio(bp, NOCRED, p))
 2769                 error = nfs_doio(bp, cr, p);
 2770         return (error);
 2771 }
 2772 
 2773 /*
 2774  * Mmap a file
 2775  *
 2776  * NB Currently unsupported.
 2777  */
 2778 /* ARGSUSED */
 2779 static int
 2780 nfs_mmap(ap)
 2781         struct vop_mmap_args /* {
 2782                 struct vnode *a_vp;
 2783                 int  a_fflags;
 2784                 struct ucred *a_cred;
 2785                 struct proc *a_p;
 2786         } */ *ap;
 2787 {
 2788 
 2789         return (EINVAL);
 2790 }
 2791 
 2792 /*
 2793  * fsync vnode op. Just call nfs_flush() with commit == 1.
 2794  */
 2795 /* ARGSUSED */
 2796 static int
 2797 nfs_fsync(ap)
 2798         struct vop_fsync_args /* {
 2799                 struct vnodeop_desc *a_desc;
 2800                 struct vnode * a_vp;
 2801                 struct ucred * a_cred;
 2802                 int  a_waitfor;
 2803                 struct proc * a_p;
 2804         } */ *ap;
 2805 {
 2806 
 2807         return (nfs_flush(ap->a_vp, ap->a_cred, ap->a_waitfor, ap->a_p, 1));
 2808 }
 2809 
 2810 /*
 2811  * Flush all the blocks associated with a vnode.
 2812  *      Walk through the buffer pool and push any dirty pages
 2813  *      associated with the vnode.
 2814  */
 2815 static int
 2816 nfs_flush(vp, cred, waitfor, p, commit)
 2817         register struct vnode *vp;
 2818         struct ucred *cred;
 2819         int waitfor;
 2820         struct proc *p;
 2821         int commit;
 2822 {
 2823         register struct nfsnode *np = VTONFS(vp);
 2824         register struct buf *bp;
 2825         register int i;
 2826         struct buf *nbp;
 2827         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2828         int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2829         int passone = 1;
 2830         u_quad_t off, endoff, toff;
 2831         struct ucred* wcred = NULL;
 2832         struct buf **bvec = NULL;
 2833 #ifndef NFS_COMMITBVECSIZ
 2834 #define NFS_COMMITBVECSIZ       20
 2835 #endif
 2836         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2837         int bvecsize = 0, bveccount;
 2838 
 2839         if (nmp->nm_flag & NFSMNT_INT)
 2840                 slpflag = PCATCH;
 2841         if (!commit)
 2842                 passone = 0;
 2843         /*
 2844          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 2845          * server, but nas not been committed to stable storage on the server
 2846          * yet. On the first pass, the byte range is worked out and the commit
 2847          * rpc is done. On the second pass, nfs_writebp() is called to do the
 2848          * job.
 2849          */
 2850 again:
 2851         off = (u_quad_t)-1;
 2852         endoff = 0;
 2853         bvecpos = 0;
 2854         if (NFS_ISV3(vp) && commit) {
 2855                 s = splbio();
 2856                 /*
 2857                  * Count up how many buffers waiting for a commit.
 2858                  */
 2859                 bveccount = 0;
 2860                 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
 2861                         nbp = TAILQ_NEXT(bp, b_vnbufs);
 2862                         if (BUF_REFCNT(bp) == 0 &&
 2863                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 2864                                 == (B_DELWRI | B_NEEDCOMMIT))
 2865                                 bveccount++;
 2866                 }
 2867                 /*
 2868                  * Allocate space to remember the list of bufs to commit.  It is
 2869                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 2870                  * If we can't get memory (for whatever reason), we will end up
 2871                  * committing the buffers one-by-one in the loop below.
 2872                  */
 2873                 if (bvec != NULL && bvec != bvec_on_stack)
 2874                         free(bvec, M_TEMP);
 2875                 if (bveccount > NFS_COMMITBVECSIZ) {
 2876                         bvec = (struct buf **)
 2877                                 malloc(bveccount * sizeof(struct buf *),
 2878                                        M_TEMP, M_NOWAIT);
 2879                         if (bvec == NULL) {
 2880                                 bvec = bvec_on_stack;
 2881                                 bvecsize = NFS_COMMITBVECSIZ;
 2882                         } else
 2883                                 bvecsize = bveccount;
 2884                 } else {
 2885                         bvec = bvec_on_stack;
 2886                         bvecsize = NFS_COMMITBVECSIZ;
 2887                 }
 2888                 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
 2889                         nbp = TAILQ_NEXT(bp, b_vnbufs);
 2890                         if (bvecpos >= bvecsize)
 2891                                 break;
 2892                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 2893                             (B_DELWRI | B_NEEDCOMMIT) ||
 2894                             BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT))
 2895                                 continue;
 2896                         bremfree(bp);
 2897                         /*
 2898                          * Work out if all buffers are using the same cred
 2899                          * so we can deal with them all with one commit.
 2900                          *
 2901                          * NOTE: we are not clearing B_DONE here, so we have
 2902                          * to do it later on in this routine if we intend to 
 2903                          * initiate I/O on the bp.
 2904                          *
 2905                          * Note: to avoid loopback deadlocks, we do not
 2906                          * assign b_runningbufspace.
 2907                          */
 2908                         if (wcred == NULL)
 2909                                 wcred = bp->b_wcred;
 2910                         else if (wcred != bp->b_wcred)
 2911                                 wcred = NOCRED;
 2912                         bp->b_flags |= B_WRITEINPROG;
 2913                         vfs_busy_pages(bp, 1);
 2914 
 2915                         /*
 2916                          * bp is protected by being locked, but nbp is not
 2917                          * and vfs_busy_pages() may sleep.  We have to
 2918                          * recalculate nbp.
 2919                          */
 2920                         nbp = TAILQ_NEXT(bp, b_vnbufs);
 2921 
 2922                         /*
 2923                          * A list of these buffers is kept so that the
 2924                          * second loop knows which buffers have actually
 2925                          * been committed. This is necessary, since there
 2926                          * may be a race between the commit rpc and new
 2927                          * uncommitted writes on the file.
 2928                          */
 2929                         bvec[bvecpos++] = bp;
 2930                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2931                                 bp->b_dirtyoff;
 2932                         if (toff < off)
 2933                                 off = toff;
 2934                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 2935                         if (toff > endoff)
 2936                                 endoff = toff;
 2937                 }
 2938                 splx(s);
 2939         }
 2940         if (bvecpos > 0) {
 2941                 /*
 2942                  * Commit data on the server, as required.
 2943                  * If all bufs are using the same wcred, then use that with
 2944                  * one call for all of them, otherwise commit each one
 2945                  * separately.
 2946                  */
 2947                 if (wcred != NOCRED)
 2948                         retv = nfs_commit(vp, off, (int)(endoff - off),
 2949                                           wcred, p);
 2950                 else {
 2951                         retv = 0;
 2952                         for (i = 0; i < bvecpos; i++) {
 2953                                 off_t off, size;
 2954                                 bp = bvec[i];
 2955                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 2956                                         bp->b_dirtyoff;
 2957                                 size = (u_quad_t)(bp->b_dirtyend
 2958                                                   - bp->b_dirtyoff);
 2959                                 retv = nfs_commit(vp, off, (int)size,
 2960                                                   bp->b_wcred, p);
 2961                                 if (retv) break;
 2962                         }
 2963                 }
 2964 
 2965                 if (retv == NFSERR_STALEWRITEVERF)
 2966                         nfs_clearcommit(vp->v_mount);
 2967 
 2968                 /*
 2969                  * Now, either mark the blocks I/O done or mark the
 2970                  * blocks dirty, depending on whether the commit
 2971                  * succeeded.
 2972                  */
 2973                 for (i = 0; i < bvecpos; i++) {
 2974                         bp = bvec[i];
 2975                         bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG | B_CLUSTEROK);
 2976                         if (retv) {
 2977                                 /*
 2978                                  * Error, leave B_DELWRI intact
 2979                                  */
 2980                                 vfs_unbusy_pages(bp);
 2981                                 brelse(bp);
 2982                         } else {
 2983                                 /*
 2984                                  * Success, remove B_DELWRI ( bundirty() ).
 2985                                  *
 2986                                  * b_dirtyoff/b_dirtyend seem to be NFS 
 2987                                  * specific.  We should probably move that
 2988                                  * into bundirty(). XXX
 2989                                  */
 2990                                 s = splbio();
 2991                                 vp->v_numoutput++;
 2992                                 bp->b_flags |= B_ASYNC;
 2993                                 bundirty(bp);
 2994                                 bp->b_flags &= ~(B_READ|B_DONE|B_ERROR);
 2995                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 2996                                 splx(s);
 2997                                 biodone(bp);
 2998                         }
 2999                 }
 3000         }
 3001 
 3002         /*
 3003          * Start/do any write(s) that are required.
 3004          */
 3005 loop:
 3006         s = splbio();
 3007         for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
 3008                 nbp = TAILQ_NEXT(bp, b_vnbufs);
 3009                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
 3010                         if (waitfor != MNT_WAIT || passone)
 3011                                 continue;
 3012                         error = BUF_TIMELOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL,
 3013                             "nfsfsync", slpflag, slptimeo);
 3014                         splx(s);
 3015                         if (error == 0)
 3016                                 panic("nfs_fsync: inconsistent lock");
 3017                         if (error == ENOLCK)
 3018                                 goto loop;
 3019                         if (nfs_sigintr(nmp, (struct nfsreq *)0, p)) {
 3020                                 error = EINTR;
 3021                                 goto done;
 3022                         }
 3023                         if (slpflag == PCATCH) {
 3024                                 slpflag = 0;
 3025                                 slptimeo = 2 * hz;
 3026                         }
 3027                         goto loop;
 3028                 }
 3029                 if ((bp->b_flags & B_DELWRI) == 0)
 3030                         panic("nfs_fsync: not dirty");
 3031                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 3032                         BUF_UNLOCK(bp);
 3033                         continue;
 3034                 }
 3035                 bremfree(bp);
 3036                 if (passone || !commit)
 3037                     bp->b_flags |= B_ASYNC;
 3038                 else
 3039                     bp->b_flags |= B_ASYNC | B_WRITEINPROG;
 3040                 splx(s);
 3041                 VOP_BWRITE(bp->b_vp, bp);
 3042                 goto loop;
 3043         }
 3044         splx(s);
 3045         if (passone) {
 3046                 passone = 0;
 3047                 goto again;
 3048         }
 3049         if (waitfor == MNT_WAIT) {
 3050                 while (vp->v_numoutput) {
 3051                         vp->v_flag |= VBWAIT;
 3052                         error = tsleep((caddr_t)&vp->v_numoutput,
 3053                                 slpflag | (PRIBIO + 1), "nfsfsync", slptimeo);
 3054                         if (error) {
 3055                             if (nfs_sigintr(nmp, (struct nfsreq *)0, p)) {
 3056                                 error = EINTR;
 3057                                 goto done;
 3058                             }
 3059                             if (slpflag == PCATCH) {
 3060                                 slpflag = 0;
 3061                                 slptimeo = 2 * hz;
 3062                             }
 3063                         }
 3064                 }
 3065                 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) && commit) {
 3066                         goto loop;
 3067                 }
 3068         }
 3069         if (np->n_flag & NWRITEERR) {
 3070                 error = np->n_error;
 3071                 np->n_flag &= ~NWRITEERR;
 3072         }
 3073 done:
 3074         if (bvec != NULL && bvec != bvec_on_stack)
 3075                 free(bvec, M_TEMP);
 3076         return (error);
 3077 }
 3078 
 3079 /*
 3080  * NFS advisory byte-level locks.
 3081  * Currently unsupported.
 3082  */
 3083 static int
 3084 nfs_advlock(ap)
 3085         struct vop_advlock_args /* {
 3086                 struct vnode *a_vp;
 3087                 caddr_t  a_id;
 3088                 int  a_op;
 3089                 struct flock *a_fl;
 3090                 int  a_flags;
 3091         } */ *ap;
 3092 {
 3093         register struct nfsnode *np = VTONFS(ap->a_vp);
 3094 
 3095         /*
 3096          * The following kludge is to allow diskless support to work
 3097          * until a real NFS lockd is implemented. Basically, just pretend
 3098          * that this is a local lock.
 3099          */
 3100         return (lf_advlock(ap, &(np->n_lockf), np->n_size));
 3101 }
 3102 
 3103 /*
 3104  * Print out the contents of an nfsnode.
 3105  */
 3106 static int
 3107 nfs_print(ap)
 3108         struct vop_print_args /* {
 3109                 struct vnode *a_vp;
 3110         } */ *ap;
 3111 {
 3112         register struct vnode *vp = ap->a_vp;
 3113         register struct nfsnode *np = VTONFS(vp);
 3114 
 3115         printf("tag VT_NFS, fileid %ld fsid 0x%x",
 3116                 np->n_vattr.va_fileid, np->n_vattr.va_fsid);
 3117         if (vp->v_type == VFIFO)
 3118                 fifo_printinfo(vp);
 3119         printf("\n");
 3120         return (0);
 3121 }
 3122 
 3123 /*
 3124  * Just call nfs_writebp() with the force argument set to 1.
 3125  *
 3126  * NOTE: B_DONE may or may not be set in a_bp on call.
 3127  */
 3128 static int
 3129 nfs_bwrite(ap)
 3130         struct vop_bwrite_args /* {
 3131                 struct vnode *a_bp;
 3132         } */ *ap;
 3133 {
 3134         return (nfs_writebp(ap->a_bp, 1, curproc));
 3135 }
 3136 
 3137 /*
 3138  * This is a clone of vn_bwrite(), except that B_WRITEINPROG isn't set unless
 3139  * the force flag is one and it also handles the B_NEEDCOMMIT flag.  We set
 3140  * B_CACHE if this is a VMIO buffer.
 3141  */
 3142 int
 3143 nfs_writebp(bp, force, procp)
 3144         register struct buf *bp;
 3145         int force;
 3146         struct proc *procp;
 3147 {
 3148         int s;
 3149         int oldflags = bp->b_flags;
 3150 #if 0
 3151         int retv = 1;
 3152         off_t off;
 3153 #endif
 3154 
 3155         if (BUF_REFCNT(bp) == 0)
 3156                 panic("bwrite: buffer is not locked???");
 3157 
 3158         if (bp->b_flags & B_INVAL) {
 3159                 brelse(bp);
 3160                 return(0);
 3161         }
 3162 
 3163         bp->b_flags |= B_CACHE;
 3164 
 3165         /*
 3166          * Undirty the bp.  We will redirty it later if the I/O fails.
 3167          */
 3168 
 3169         s = splbio();
 3170         bundirty(bp);
 3171         bp->b_flags &= ~(B_READ|B_DONE|B_ERROR);
 3172 
 3173         bp->b_vp->v_numoutput++;
 3174         curproc->p_stats->p_ru.ru_oublock++;
 3175         splx(s);
 3176 
 3177         /*
 3178          * Note: to avoid loopback deadlocks, we do not
 3179          * assign b_runningbufspace.
 3180          */
 3181         vfs_busy_pages(bp, 1);
 3182 
 3183         if (force)
 3184                 bp->b_flags |= B_WRITEINPROG;
 3185         BUF_KERNPROC(bp);
 3186         VOP_STRATEGY(bp->b_vp, bp);
 3187 
 3188         if( (oldflags & B_ASYNC) == 0) {
 3189                 int rtval = biowait(bp);
 3190 
 3191                 if (oldflags & B_DELWRI) {
 3192                         s = splbio();
 3193                         reassignbuf(bp, bp->b_vp);
 3194                         splx(s);
 3195                 }
 3196 
 3197                 brelse(bp);
 3198                 return (rtval);
 3199         } 
 3200 
 3201         return (0);
 3202 }
 3203 
 3204 /*
 3205  * nfs special file access vnode op.
 3206  * Essentially just get vattr and then imitate iaccess() since the device is
 3207  * local to the client.
 3208  */
 3209 static int
 3210 nfsspec_access(ap)
 3211         struct vop_access_args /* {
 3212                 struct vnode *a_vp;
 3213                 int  a_mode;
 3214                 struct ucred *a_cred;
 3215                 struct proc *a_p;
 3216         } */ *ap;
 3217 {
 3218         register struct vattr *vap;
 3219         register gid_t *gp;
 3220         register struct ucred *cred = ap->a_cred;
 3221         struct vnode *vp = ap->a_vp;
 3222         mode_t mode = ap->a_mode;
 3223         struct vattr vattr;
 3224         register int i;
 3225         int error;
 3226 
 3227         /*
 3228          * Disallow write attempts on filesystems mounted read-only;
 3229          * unless the file is a socket, fifo, or a block or character
 3230          * device resident on the filesystem.
 3231          */
 3232         if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3233                 switch (vp->v_type) {
 3234                 case VREG:
 3235                 case VDIR:
 3236                 case VLNK:
 3237                         return (EROFS);
 3238                 default:
 3239                         break;
 3240                 }
 3241         }
 3242         /*
 3243          * If you're the super-user,
 3244          * you always get access.
 3245          */
 3246         if (cred->cr_uid == 0)
 3247                 return (0);
 3248         vap = &vattr;
 3249         error = VOP_GETATTR(vp, vap, cred, ap->a_p);
 3250         if (error)
 3251                 return (error);
 3252         /*
 3253          * Access check is based on only one of owner, group, public.
 3254          * If not owner, then check group. If not a member of the
 3255          * group, then check public access.
 3256          */
 3257         if (cred->cr_uid != vap->va_uid) {
 3258                 mode >>= 3;
 3259                 gp = cred->cr_groups;
 3260                 for (i = 0; i < cred->cr_ngroups; i++, gp++)
 3261                         if (vap->va_gid == *gp)
 3262                                 goto found;
 3263                 mode >>= 3;
 3264 found:
 3265                 ;
 3266         }
 3267         error = (vap->va_mode & mode) == mode ? 0 : EACCES;
 3268         return (error);
 3269 }
 3270 
 3271 /*
 3272  * Read wrapper for special devices.
 3273  */
 3274 static int
 3275 nfsspec_read(ap)
 3276         struct vop_read_args /* {
 3277                 struct vnode *a_vp;
 3278                 struct uio *a_uio;
 3279                 int  a_ioflag;
 3280                 struct ucred *a_cred;
 3281         } */ *ap;
 3282 {
 3283         register struct nfsnode *np = VTONFS(ap->a_vp);
 3284 
 3285         /*
 3286          * Set access flag.
 3287          */
 3288         np->n_flag |= NACC;
 3289         getnanotime(&np->n_atim);
 3290         return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap));
 3291 }
 3292 
 3293 /*
 3294  * Write wrapper for special devices.
 3295  */
 3296 static int
 3297 nfsspec_write(ap)
 3298         struct vop_write_args /* {
 3299                 struct vnode *a_vp;
 3300                 struct uio *a_uio;
 3301                 int  a_ioflag;
 3302                 struct ucred *a_cred;
 3303         } */ *ap;
 3304 {
 3305         register struct nfsnode *np = VTONFS(ap->a_vp);
 3306 
 3307         /*
 3308          * Set update flag.
 3309          */
 3310         np->n_flag |= NUPD;
 3311         getnanotime(&np->n_mtim);
 3312         return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap));
 3313 }
 3314 
 3315 /*
 3316  * Close wrapper for special devices.
 3317  *
 3318  * Update the times on the nfsnode then do device close.
 3319  */
 3320 static int
 3321 nfsspec_close(ap)
 3322         struct vop_close_args /* {
 3323                 struct vnode *a_vp;
 3324                 int  a_fflag;
 3325                 struct ucred *a_cred;
 3326                 struct proc *a_p;
 3327         } */ *ap;
 3328 {
 3329         register struct vnode *vp = ap->a_vp;
 3330         register struct nfsnode *np = VTONFS(vp);
 3331         struct vattr vattr;
 3332 
 3333         if (np->n_flag & (NACC | NUPD)) {
 3334                 np->n_flag |= NCHG;
 3335                 if (vp->v_usecount == 1 &&
 3336                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3337                         VATTR_NULL(&vattr);
 3338                         if (np->n_flag & NACC)
 3339                                 vattr.va_atime = np->n_atim;
 3340                         if (np->n_flag & NUPD)
 3341                                 vattr.va_mtime = np->n_mtim;
 3342                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_p);
 3343                 }
 3344         }
 3345         return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap));
 3346 }
 3347 
 3348 /*
 3349  * Read wrapper for fifos.
 3350  */
 3351 static int
 3352 nfsfifo_read(ap)
 3353         struct vop_read_args /* {
 3354                 struct vnode *a_vp;
 3355                 struct uio *a_uio;
 3356                 int  a_ioflag;
 3357                 struct ucred *a_cred;
 3358         } */ *ap;
 3359 {
 3360         register struct nfsnode *np = VTONFS(ap->a_vp);
 3361 
 3362         /*
 3363          * Set access flag.
 3364          */
 3365         np->n_flag |= NACC;
 3366         getnanotime(&np->n_atim);
 3367         return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap));
 3368 }
 3369 
 3370 /*
 3371  * Write wrapper for fifos.
 3372  */
 3373 static int
 3374 nfsfifo_write(ap)
 3375         struct vop_write_args /* {
 3376                 struct vnode *a_vp;
 3377                 struct uio *a_uio;
 3378                 int  a_ioflag;
 3379                 struct ucred *a_cred;
 3380         } */ *ap;
 3381 {
 3382         register struct nfsnode *np = VTONFS(ap->a_vp);
 3383 
 3384         /*
 3385          * Set update flag.
 3386          */
 3387         np->n_flag |= NUPD;
 3388         getnanotime(&np->n_mtim);
 3389         return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap));
 3390 }
 3391 
 3392 /*
 3393  * Close wrapper for fifos.
 3394  *
 3395  * Update the times on the nfsnode then do fifo close.
 3396  */
 3397 static int
 3398 nfsfifo_close(ap)
 3399         struct vop_close_args /* {
 3400                 struct vnode *a_vp;
 3401                 int  a_fflag;
 3402                 struct ucred *a_cred;
 3403                 struct proc *a_p;
 3404         } */ *ap;
 3405 {
 3406         register struct vnode *vp = ap->a_vp;
 3407         register struct nfsnode *np = VTONFS(vp);
 3408         struct vattr vattr;
 3409         struct timespec ts;
 3410 
 3411         if (np->n_flag & (NACC | NUPD)) {
 3412                 getnanotime(&ts);
 3413                 if (np->n_flag & NACC)
 3414                         np->n_atim = ts;
 3415                 if (np->n_flag & NUPD)
 3416                         np->n_mtim = ts;
 3417                 np->n_flag |= NCHG;
 3418                 if (vp->v_usecount == 1 &&
 3419                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3420                         VATTR_NULL(&vattr);
 3421                         if (np->n_flag & NACC)
 3422                                 vattr.va_atime = np->n_atim;
 3423                         if (np->n_flag & NUPD)
 3424                                 vattr.va_mtime = np->n_mtim;
 3425                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_p);
 3426                 }
 3427         }
 3428         return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap));
 3429 }
 3430 

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