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

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/10.0/sys/nfsclient/nfs_vnops.c 252479 2013-07-01 21:16:19Z rmacklem $");
   37 
   38 /*
   39  * vnode op calls for Sun NFS version 2 and 3
   40  */
   41 
   42 #include "opt_inet.h"
   43 #include "opt_kdtrace.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/kernel.h>
   47 #include <sys/systm.h>
   48 #include <sys/resourcevar.h>
   49 #include <sys/proc.h>
   50 #include <sys/mount.h>
   51 #include <sys/bio.h>
   52 #include <sys/buf.h>
   53 #include <sys/jail.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/signalvar.h>
   65 
   66 #include <vm/vm.h>
   67 #include <vm/vm_extern.h>
   68 #include <vm/vm_object.h>
   69 
   70 #include <nfs/nfsproto.h>
   71 #include <nfsclient/nfs.h>
   72 #include <nfsclient/nfsnode.h>
   73 #include <nfsclient/nfsmount.h>
   74 #include <nfs/nfs_kdtrace.h>
   75 #include <nfs/nfs_lock.h>
   76 #include <nfs/xdr_subs.h>
   77 #include <nfsclient/nfsm_subs.h>
   78 
   79 #include <net/if.h>
   80 #include <netinet/in.h>
   81 #include <netinet/in_var.h>
   82 
   83 #include <machine/stdarg.h>
   84 
   85 #ifdef KDTRACE_HOOKS
   86 #include <sys/dtrace_bsd.h>
   87 
   88 dtrace_nfsclient_accesscache_flush_probe_func_t
   89     dtrace_nfsclient_accesscache_flush_done_probe;
   90 uint32_t nfsclient_accesscache_flush_done_id;
   91 
   92 dtrace_nfsclient_accesscache_get_probe_func_t
   93     dtrace_nfsclient_accesscache_get_hit_probe,
   94     dtrace_nfsclient_accesscache_get_miss_probe;
   95 uint32_t nfsclient_accesscache_get_hit_id;
   96 uint32_t nfsclient_accesscache_get_miss_id;
   97 
   98 dtrace_nfsclient_accesscache_load_probe_func_t
   99     dtrace_nfsclient_accesscache_load_done_probe;
  100 uint32_t nfsclient_accesscache_load_done_id;
  101 #endif /* !KDTRACE_HOOKS */
  102 
  103 /* Defs */
  104 #define TRUE    1
  105 #define FALSE   0
  106 
  107 /*
  108  * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
  109  * calls are not in getblk() and brelse() so that they would not be necessary
  110  * here.
  111  */
  112 #ifndef B_VMIO
  113 #define vfs_busy_pages(bp, f)
  114 #endif
  115 
  116 static vop_read_t       nfsfifo_read;
  117 static vop_write_t      nfsfifo_write;
  118 static vop_close_t      nfsfifo_close;
  119 static int      nfs_flush(struct vnode *, int, int);
  120 static int      nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *);
  121 static vop_lookup_t     nfs_lookup;
  122 static vop_create_t     nfs_create;
  123 static vop_mknod_t      nfs_mknod;
  124 static vop_open_t       nfs_open;
  125 static vop_close_t      nfs_close;
  126 static vop_access_t     nfs_access;
  127 static vop_getattr_t    nfs_getattr;
  128 static vop_setattr_t    nfs_setattr;
  129 static vop_read_t       nfs_read;
  130 static vop_fsync_t      nfs_fsync;
  131 static vop_remove_t     nfs_remove;
  132 static vop_link_t       nfs_link;
  133 static vop_rename_t     nfs_rename;
  134 static vop_mkdir_t      nfs_mkdir;
  135 static vop_rmdir_t      nfs_rmdir;
  136 static vop_symlink_t    nfs_symlink;
  137 static vop_readdir_t    nfs_readdir;
  138 static vop_strategy_t   nfs_strategy;
  139 static  int     nfs_lookitup(struct vnode *, const char *, int,
  140                     struct ucred *, struct thread *, struct nfsnode **);
  141 static  int     nfs_sillyrename(struct vnode *, struct vnode *,
  142                     struct componentname *);
  143 static vop_access_t     nfsspec_access;
  144 static vop_readlink_t   nfs_readlink;
  145 static vop_print_t      nfs_print;
  146 static vop_advlock_t    nfs_advlock;
  147 static vop_advlockasync_t nfs_advlockasync;
  148 
  149 /*
  150  * Global vfs data structures for nfs
  151  */
  152 struct vop_vector nfs_vnodeops = {
  153         .vop_default =          &default_vnodeops,
  154         .vop_access =           nfs_access,
  155         .vop_advlock =          nfs_advlock,
  156         .vop_advlockasync =     nfs_advlockasync,
  157         .vop_close =            nfs_close,
  158         .vop_create =           nfs_create,
  159         .vop_fsync =            nfs_fsync,
  160         .vop_getattr =          nfs_getattr,
  161         .vop_getpages =         nfs_getpages,
  162         .vop_putpages =         nfs_putpages,
  163         .vop_inactive =         nfs_inactive,
  164         .vop_link =             nfs_link,
  165         .vop_lookup =           nfs_lookup,
  166         .vop_mkdir =            nfs_mkdir,
  167         .vop_mknod =            nfs_mknod,
  168         .vop_open =             nfs_open,
  169         .vop_print =            nfs_print,
  170         .vop_read =             nfs_read,
  171         .vop_readdir =          nfs_readdir,
  172         .vop_readlink =         nfs_readlink,
  173         .vop_reclaim =          nfs_reclaim,
  174         .vop_remove =           nfs_remove,
  175         .vop_rename =           nfs_rename,
  176         .vop_rmdir =            nfs_rmdir,
  177         .vop_setattr =          nfs_setattr,
  178         .vop_strategy =         nfs_strategy,
  179         .vop_symlink =          nfs_symlink,
  180         .vop_write =            nfs_write,
  181 };
  182 
  183 struct vop_vector nfs_fifoops = {
  184         .vop_default =          &fifo_specops,
  185         .vop_access =           nfsspec_access,
  186         .vop_close =            nfsfifo_close,
  187         .vop_fsync =            nfs_fsync,
  188         .vop_getattr =          nfs_getattr,
  189         .vop_inactive =         nfs_inactive,
  190         .vop_print =            nfs_print,
  191         .vop_read =             nfsfifo_read,
  192         .vop_reclaim =          nfs_reclaim,
  193         .vop_setattr =          nfs_setattr,
  194         .vop_write =            nfsfifo_write,
  195 };
  196 
  197 static int      nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
  198                              struct componentname *cnp, struct vattr *vap);
  199 static int      nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
  200                               struct ucred *cred, struct thread *td);
  201 static int      nfs_renamerpc(struct vnode *fdvp, const char *fnameptr,
  202                               int fnamelen, struct vnode *tdvp,
  203                               const char *tnameptr, int tnamelen,
  204                               struct ucred *cred, struct thread *td);
  205 static int      nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
  206                              struct sillyrename *sp);
  207 
  208 /*
  209  * Global variables
  210  */
  211 struct mtx      nfs_iod_mtx;
  212 enum nfsiod_state nfs_iodwant[NFS_MAXASYNCDAEMON];
  213 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
  214 int              nfs_numasync = 0;
  215 #define DIRHDSIZ        (sizeof (struct dirent) - (MAXNAMLEN + 1))
  216 
  217 SYSCTL_DECL(_vfs_oldnfs);
  218 
  219 static int      nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
  220 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
  221            &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
  222 
  223 static int      nfs_prime_access_cache = 0;
  224 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
  225            &nfs_prime_access_cache, 0,
  226            "Prime NFS ACCESS cache when fetching attributes");
  227 
  228 static int      nfsv3_commit_on_close = 0;
  229 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW,
  230            &nfsv3_commit_on_close, 0, "write+commit on close, else only write");
  231 
  232 static int      nfs_clean_pages_on_close = 1;
  233 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
  234            &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
  235 
  236 int nfs_directio_enable = 0;
  237 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
  238            &nfs_directio_enable, 0, "Enable NFS directio");
  239 
  240 /*
  241  * This sysctl allows other processes to mmap a file that has been opened
  242  * O_DIRECT by a process.  In general, having processes mmap the file while
  243  * Direct IO is in progress can lead to Data Inconsistencies.  But, we allow
  244  * this by default to prevent DoS attacks - to prevent a malicious user from
  245  * opening up files O_DIRECT preventing other users from mmap'ing these
  246  * files.  "Protected" environments where stricter consistency guarantees are
  247  * required can disable this knob.  The process that opened the file O_DIRECT
  248  * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
  249  * meaningful.
  250  */
  251 int nfs_directio_allow_mmap = 1;
  252 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
  253            &nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
  254 
  255 #if 0
  256 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
  257            &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
  258 
  259 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
  260            &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
  261 #endif
  262 
  263 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY          \
  264                          | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE     \
  265                          | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP)
  266 
  267 /*
  268  * SMP Locking Note :
  269  * The list of locks after the description of the lock is the ordering
  270  * of other locks acquired with the lock held.
  271  * np->n_mtx : Protects the fields in the nfsnode.
  272        VM Object Lock
  273        VI_MTX (acquired indirectly)
  274  * nmp->nm_mtx : Protects the fields in the nfsmount.
  275        rep->r_mtx
  276  * nfs_iod_mtx : Global lock, protects shared nfsiod state.
  277  * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
  278        nmp->nm_mtx
  279        rep->r_mtx
  280  * rep->r_mtx : Protects the fields in an nfsreq.
  281  */
  282 
  283 static int
  284 nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td,
  285     struct ucred *cred, uint32_t *retmode)
  286 {
  287         const int v3 = 1;
  288         u_int32_t *tl;
  289         int error = 0, attrflag, i, lrupos;
  290 
  291         struct mbuf *mreq, *mrep, *md, *mb;
  292         caddr_t bpos, dpos;
  293         u_int32_t rmode;
  294         struct nfsnode *np = VTONFS(vp);
  295 
  296         nfsstats.rpccnt[NFSPROC_ACCESS]++;
  297         mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED, M_WAITOK, MT_DATA, 0);
  298         mb = mreq;
  299         bpos = mtod(mb, caddr_t);
  300         nfsm_fhtom(vp, v3);
  301         tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
  302         *tl = txdr_unsigned(wmode);
  303         nfsm_request(vp, NFSPROC_ACCESS, td, cred);
  304         nfsm_postop_attr(vp, attrflag);
  305         if (!error) {
  306                 lrupos = 0;
  307                 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
  308                 rmode = fxdr_unsigned(u_int32_t, *tl);
  309                 mtx_lock(&np->n_mtx);
  310                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  311                         if (np->n_accesscache[i].uid == cred->cr_uid) {
  312                                 np->n_accesscache[i].mode = rmode;
  313                                 np->n_accesscache[i].stamp = time_second;
  314                                 break;
  315                         }
  316                         if (i > 0 && np->n_accesscache[i].stamp <
  317                             np->n_accesscache[lrupos].stamp)
  318                                 lrupos = i;
  319                 }
  320                 if (i == NFS_ACCESSCACHESIZE) {
  321                         np->n_accesscache[lrupos].uid = cred->cr_uid;
  322                         np->n_accesscache[lrupos].mode = rmode;
  323                         np->n_accesscache[lrupos].stamp = time_second;
  324                 }
  325                 mtx_unlock(&np->n_mtx);
  326                 if (retmode != NULL)
  327                         *retmode = rmode;
  328                 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
  329         }
  330         m_freem(mrep);
  331 nfsmout:
  332 #ifdef KDTRACE_HOOKS
  333         if (error) {
  334                 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
  335                     error);
  336         }
  337 #endif
  338         return (error);
  339 }
  340 
  341 /*
  342  * nfs access vnode op.
  343  * For nfs version 2, just return ok. File accesses may fail later.
  344  * For nfs version 3, use the access rpc to check accessibility. If file modes
  345  * are changed on the server, accesses might still fail later.
  346  */
  347 static int
  348 nfs_access(struct vop_access_args *ap)
  349 {
  350         struct vnode *vp = ap->a_vp;
  351         int error = 0, i, gotahit;
  352         u_int32_t mode, rmode, wmode;
  353         int v3 = NFS_ISV3(vp);
  354         struct nfsnode *np = VTONFS(vp);
  355 
  356         /*
  357          * Disallow write attempts on filesystems mounted read-only;
  358          * unless the file is a socket, fifo, or a block or character
  359          * device resident on the filesystem.
  360          */
  361         if ((ap->a_accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
  362                 switch (vp->v_type) {
  363                 case VREG:
  364                 case VDIR:
  365                 case VLNK:
  366                         return (EROFS);
  367                 default:
  368                         break;
  369                 }
  370         }
  371         /*
  372          * For nfs v3, check to see if we have done this recently, and if
  373          * so return our cached result instead of making an ACCESS call.
  374          * If not, do an access rpc, otherwise you are stuck emulating
  375          * ufs_access() locally using the vattr. This may not be correct,
  376          * since the server may apply other access criteria such as
  377          * client uid-->server uid mapping that we do not know about.
  378          */
  379         if (v3) {
  380                 if (ap->a_accmode & VREAD)
  381                         mode = NFSV3ACCESS_READ;
  382                 else
  383                         mode = 0;
  384                 if (vp->v_type != VDIR) {
  385                         if (ap->a_accmode & VWRITE)
  386                                 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
  387                         if (ap->a_accmode & VEXEC)
  388                                 mode |= NFSV3ACCESS_EXECUTE;
  389                 } else {
  390                         if (ap->a_accmode & VWRITE)
  391                                 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
  392                                          NFSV3ACCESS_DELETE);
  393                         if (ap->a_accmode & VEXEC)
  394                                 mode |= NFSV3ACCESS_LOOKUP;
  395                 }
  396                 /* XXX safety belt, only make blanket request if caching */
  397                 if (nfsaccess_cache_timeout > 0) {
  398                         wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY |
  399                                 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE |
  400                                 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP;
  401                 } else {
  402                         wmode = mode;
  403                 }
  404 
  405                 /*
  406                  * Does our cached result allow us to give a definite yes to
  407                  * this request?
  408                  */
  409                 gotahit = 0;
  410                 mtx_lock(&np->n_mtx);
  411                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
  412                         if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
  413                                 if (time_second < (np->n_accesscache[i].stamp +
  414                                     nfsaccess_cache_timeout) &&
  415                                     (np->n_accesscache[i].mode & mode) == mode) {
  416                                         nfsstats.accesscache_hits++;
  417                                         gotahit = 1;
  418                                 }
  419                                 break;
  420                         }
  421                 }
  422                 mtx_unlock(&np->n_mtx);
  423 #ifdef KDTRACE_HOOKS
  424                 if (gotahit)
  425                         KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
  426                             ap->a_cred->cr_uid, mode);
  427                 else
  428                         KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
  429                             ap->a_cred->cr_uid, mode);
  430 #endif
  431                 if (gotahit == 0) {
  432                         /*
  433                          * Either a no, or a don't know.  Go to the wire.
  434                          */
  435                         nfsstats.accesscache_misses++;
  436                         error = nfs3_access_otw(vp, wmode, ap->a_td, ap->a_cred,
  437                             &rmode);
  438                         if (!error) {
  439                                 if ((rmode & mode) != mode)
  440                                         error = EACCES;
  441                         }
  442                 }
  443                 return (error);
  444         } else {
  445                 if ((error = nfsspec_access(ap)) != 0) {
  446                         return (error);
  447                 }
  448                 /*
  449                  * Attempt to prevent a mapped root from accessing a file
  450                  * which it shouldn't.  We try to read a byte from the file
  451                  * if the user is root and the file is not zero length.
  452                  * After calling nfsspec_access, we should have the correct
  453                  * file size cached.
  454                  */
  455                 mtx_lock(&np->n_mtx);
  456                 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
  457                     && VTONFS(vp)->n_size > 0) {
  458                         struct iovec aiov;
  459                         struct uio auio;
  460                         char buf[1];
  461 
  462                         mtx_unlock(&np->n_mtx);
  463                         aiov.iov_base = buf;
  464                         aiov.iov_len = 1;
  465                         auio.uio_iov = &aiov;
  466                         auio.uio_iovcnt = 1;
  467                         auio.uio_offset = 0;
  468                         auio.uio_resid = 1;
  469                         auio.uio_segflg = UIO_SYSSPACE;
  470                         auio.uio_rw = UIO_READ;
  471                         auio.uio_td = ap->a_td;
  472 
  473                         if (vp->v_type == VREG)
  474                                 error = nfs_readrpc(vp, &auio, ap->a_cred);
  475                         else if (vp->v_type == VDIR) {
  476                                 char* bp;
  477                                 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
  478                                 aiov.iov_base = bp;
  479                                 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
  480                                 error = nfs_readdirrpc(vp, &auio, ap->a_cred);
  481                                 free(bp, M_TEMP);
  482                         } else if (vp->v_type == VLNK)
  483                                 error = nfs_readlinkrpc(vp, &auio, ap->a_cred);
  484                         else
  485                                 error = EACCES;
  486                 } else
  487                         mtx_unlock(&np->n_mtx);
  488                 return (error);
  489         }
  490 }
  491 
  492 int nfs_otw_getattr_avoid = 0;
  493 
  494 /*
  495  * nfs open vnode op
  496  * Check to see if the type is ok
  497  * and that deletion is not in progress.
  498  * For paged in text files, you will need to flush the page cache
  499  * if consistency is lost.
  500  */
  501 /* ARGSUSED */
  502 static int
  503 nfs_open(struct vop_open_args *ap)
  504 {
  505         struct vnode *vp = ap->a_vp;
  506         struct nfsnode *np = VTONFS(vp);
  507         struct vattr vattr;
  508         int error;
  509         int fmode = ap->a_mode;
  510         struct ucred *cred;
  511 
  512         if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
  513                 return (EOPNOTSUPP);
  514 
  515         /*
  516          * Get a valid lease. If cached data is stale, flush it.
  517          */
  518         mtx_lock(&np->n_mtx);
  519         if (np->n_flag & NMODIFIED) {
  520                 mtx_unlock(&np->n_mtx);
  521                 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  522                 if (error == EINTR || error == EIO)
  523                         return (error);
  524                 mtx_lock(&np->n_mtx);
  525                 np->n_attrstamp = 0;
  526                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  527                 if (vp->v_type == VDIR)
  528                         np->n_direofoffset = 0;
  529                 mtx_unlock(&np->n_mtx);
  530                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  531                 if (error)
  532                         return (error);
  533                 mtx_lock(&np->n_mtx);
  534                 np->n_mtime = vattr.va_mtime;
  535         } else {
  536                 mtx_unlock(&np->n_mtx);
  537                 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
  538                 if (error)
  539                         return (error);
  540                 mtx_lock(&np->n_mtx);
  541                 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
  542                         if (vp->v_type == VDIR)
  543                                 np->n_direofoffset = 0;
  544                         mtx_unlock(&np->n_mtx);
  545                         error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  546                         if (error == EINTR || error == EIO) {
  547                                 return (error);
  548                         }
  549                         mtx_lock(&np->n_mtx);
  550                         np->n_mtime = vattr.va_mtime;
  551                 }
  552         }
  553         /*
  554          * If the object has >= 1 O_DIRECT active opens, we disable caching.
  555          */
  556         if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  557                 if (np->n_directio_opens == 0) {
  558                         mtx_unlock(&np->n_mtx);
  559                         error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  560                         if (error)
  561                                 return (error);
  562                         mtx_lock(&np->n_mtx);
  563                         np->n_flag |= NNONCACHE;
  564                 }
  565                 np->n_directio_opens++;
  566         }
  567 
  568         /*
  569          * If this is an open for writing, capture a reference to the
  570          * credentials, so they can be used by nfs_putpages(). Using
  571          * these write credentials is preferable to the credentials of
  572          * whatever thread happens to be doing the VOP_PUTPAGES() since
  573          * the write RPCs are less likely to fail with EACCES.
  574          */
  575         if ((fmode & FWRITE) != 0) {
  576                 cred = np->n_writecred;
  577                 np->n_writecred = crhold(ap->a_cred);
  578         } else
  579                 cred = NULL;
  580         mtx_unlock(&np->n_mtx);
  581         if (cred != NULL)
  582                 crfree(cred);
  583         vnode_create_vobject(vp, vattr.va_size, ap->a_td);
  584         return (0);
  585 }
  586 
  587 /*
  588  * nfs close vnode op
  589  * What an NFS client should do upon close after writing is a debatable issue.
  590  * Most NFS clients push delayed writes to the server upon close, basically for
  591  * two reasons:
  592  * 1 - So that any write errors may be reported back to the client process
  593  *     doing the close system call. By far the two most likely errors are
  594  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
  595  * 2 - To put a worst case upper bound on cache inconsistency between
  596  *     multiple clients for the file.
  597  * There is also a consistency problem for Version 2 of the protocol w.r.t.
  598  * not being able to tell if other clients are writing a file concurrently,
  599  * since there is no way of knowing if the changed modify time in the reply
  600  * is only due to the write for this client.
  601  * (NFS Version 3 provides weak cache consistency data in the reply that
  602  *  should be sufficient to detect and handle this case.)
  603  *
  604  * The current code does the following:
  605  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
  606  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
  607  *                     or commit them (this satisfies 1 and 2 except for the
  608  *                     case where the server crashes after this close but
  609  *                     before the commit RPC, which is felt to be "good
  610  *                     enough". Changing the last argument to nfs_flush() to
  611  *                     a 1 would force a commit operation, if it is felt a
  612  *                     commit is necessary now.
  613  */
  614 /* ARGSUSED */
  615 static int
  616 nfs_close(struct vop_close_args *ap)
  617 {
  618         struct vnode *vp = ap->a_vp;
  619         struct nfsnode *np = VTONFS(vp);
  620         int error = 0;
  621         int fmode = ap->a_fflag;
  622 
  623         if (vp->v_type == VREG) {
  624             /*
  625              * Examine and clean dirty pages, regardless of NMODIFIED.
  626              * This closes a major hole in close-to-open consistency.
  627              * We want to push out all dirty pages (and buffers) on
  628              * close, regardless of whether they were dirtied by
  629              * mmap'ed writes or via write().
  630              */
  631             if (nfs_clean_pages_on_close && vp->v_object) {
  632                 VM_OBJECT_WLOCK(vp->v_object);
  633                 vm_object_page_clean(vp->v_object, 0, 0, 0);
  634                 VM_OBJECT_WUNLOCK(vp->v_object);
  635             }
  636             mtx_lock(&np->n_mtx);
  637             if (np->n_flag & NMODIFIED) {
  638                 mtx_unlock(&np->n_mtx);
  639                 if (NFS_ISV3(vp)) {
  640                     /*
  641                      * Under NFSv3 we have dirty buffers to dispose of.  We
  642                      * must flush them to the NFS server.  We have the option
  643                      * of waiting all the way through the commit rpc or just
  644                      * waiting for the initial write.  The default is to only
  645                      * wait through the initial write so the data is in the
  646                      * server's cache, which is roughly similar to the state
  647                      * a standard disk subsystem leaves the file in on close().
  648                      *
  649                      * We cannot clear the NMODIFIED bit in np->n_flag due to
  650                      * potential races with other processes, and certainly
  651                      * cannot clear it if we don't commit.
  652                      */
  653                     int cm = nfsv3_commit_on_close ? 1 : 0;
  654                     error = nfs_flush(vp, MNT_WAIT, cm);
  655                     /* np->n_flag &= ~NMODIFIED; */
  656                 } else
  657                     error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
  658                 mtx_lock(&np->n_mtx);
  659             }
  660             if (np->n_flag & NWRITEERR) {
  661                 np->n_flag &= ~NWRITEERR;
  662                 error = np->n_error;
  663             }
  664             mtx_unlock(&np->n_mtx);
  665         }
  666         if (nfs_directio_enable)
  667                 KASSERT((np->n_directio_asyncwr == 0),
  668                         ("nfs_close: dirty unflushed (%d) directio buffers\n",
  669                          np->n_directio_asyncwr));
  670         if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
  671                 mtx_lock(&np->n_mtx);
  672                 KASSERT((np->n_directio_opens > 0), 
  673                         ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
  674                 np->n_directio_opens--;
  675                 if (np->n_directio_opens == 0)
  676                         np->n_flag &= ~NNONCACHE;
  677                 mtx_unlock(&np->n_mtx);
  678         }
  679         return (error);
  680 }
  681 
  682 /*
  683  * nfs getattr call from vfs.
  684  */
  685 static int
  686 nfs_getattr(struct vop_getattr_args *ap)
  687 {
  688         struct vnode *vp = ap->a_vp;
  689         struct nfsnode *np = VTONFS(vp);
  690         struct thread *td = curthread;
  691         struct vattr *vap = ap->a_vap;
  692         struct vattr vattr;
  693         caddr_t bpos, dpos;
  694         int error = 0;
  695         struct mbuf *mreq, *mrep, *md, *mb;
  696         int v3 = NFS_ISV3(vp);
  697 
  698         /*
  699          * Update local times for special files.
  700          */
  701         mtx_lock(&np->n_mtx);
  702         if (np->n_flag & (NACC | NUPD))
  703                 np->n_flag |= NCHG;
  704         mtx_unlock(&np->n_mtx);
  705         /*
  706          * First look in the cache.
  707          */
  708         if (nfs_getattrcache(vp, &vattr) == 0)
  709                 goto nfsmout;
  710         if (v3 && nfs_prime_access_cache && nfsaccess_cache_timeout > 0) {
  711                 nfsstats.accesscache_misses++;
  712                 nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, ap->a_cred, NULL);
  713                 if (nfs_getattrcache(vp, &vattr) == 0)
  714                         goto nfsmout;
  715         }
  716         nfsstats.rpccnt[NFSPROC_GETATTR]++;
  717         mreq = m_get2(NFSX_FH(v3), M_WAITOK, MT_DATA, 0);
  718         mb = mreq;
  719         bpos = mtod(mb, caddr_t);
  720         nfsm_fhtom(vp, v3);
  721         nfsm_request(vp, NFSPROC_GETATTR, td, ap->a_cred);
  722         if (!error) {
  723                 nfsm_loadattr(vp, &vattr);
  724         }
  725         m_freem(mrep);
  726 nfsmout:
  727         vap->va_type = vattr.va_type;
  728         vap->va_mode = vattr.va_mode;
  729         vap->va_nlink = vattr.va_nlink;
  730         vap->va_uid = vattr.va_uid;
  731         vap->va_gid = vattr.va_gid;
  732         vap->va_fsid = vattr.va_fsid;
  733         vap->va_fileid = vattr.va_fileid;
  734         vap->va_size = vattr.va_size;
  735         vap->va_blocksize = vattr.va_blocksize;
  736         vap->va_atime = vattr.va_atime;
  737         vap->va_mtime = vattr.va_mtime;
  738         vap->va_ctime = vattr.va_ctime;
  739         vap->va_gen = vattr.va_gen;
  740         vap->va_flags = vattr.va_flags;
  741         vap->va_rdev = vattr.va_rdev;
  742         vap->va_bytes = vattr.va_bytes;
  743         vap->va_filerev = vattr.va_filerev;
  744 
  745         return (error);
  746 }
  747 
  748 /*
  749  * nfs setattr call.
  750  */
  751 static int
  752 nfs_setattr(struct vop_setattr_args *ap)
  753 {
  754         struct vnode *vp = ap->a_vp;
  755         struct nfsnode *np = VTONFS(vp);
  756         struct vattr *vap = ap->a_vap;
  757         struct thread *td = curthread;
  758         int error = 0;
  759         u_quad_t tsize;
  760 
  761 #ifndef nolint
  762         tsize = (u_quad_t)0;
  763 #endif
  764 
  765         /*
  766          * Setting of flags is not supported.
  767          */
  768         if (vap->va_flags != VNOVAL)
  769                 return (EOPNOTSUPP);
  770 
  771         /*
  772          * Disallow write attempts if the filesystem is mounted read-only.
  773          */
  774         if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  775             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  776             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
  777             (vp->v_mount->mnt_flag & MNT_RDONLY)) {
  778                 error = EROFS;
  779                 goto out;
  780         }
  781         if (vap->va_size != VNOVAL) {
  782                 switch (vp->v_type) {
  783                 case VDIR:
  784                         return (EISDIR);
  785                 case VCHR:
  786                 case VBLK:
  787                 case VSOCK:
  788                 case VFIFO:
  789                         if (vap->va_mtime.tv_sec == VNOVAL &&
  790                             vap->va_atime.tv_sec == VNOVAL &&
  791                             vap->va_mode == (mode_t)VNOVAL &&
  792                             vap->va_uid == (uid_t)VNOVAL &&
  793                             vap->va_gid == (gid_t)VNOVAL)
  794                                 return (0);             
  795                         vap->va_size = VNOVAL;
  796                         break;
  797                 default:
  798                         /*
  799                          * Disallow write attempts if the filesystem is
  800                          * mounted read-only.
  801                          */
  802                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  803                                 return (EROFS);
  804                         /*
  805                          *  We run vnode_pager_setsize() early (why?),
  806                          * we must set np->n_size now to avoid vinvalbuf
  807                          * V_SAVE races that might setsize a lower
  808                          * value.
  809                          */
  810                         mtx_lock(&np->n_mtx);
  811                         tsize = np->n_size;
  812                         mtx_unlock(&np->n_mtx);
  813                         error = nfs_meta_setsize(vp, ap->a_cred, td,
  814                             vap->va_size);
  815                         mtx_lock(&np->n_mtx);
  816                         if (np->n_flag & NMODIFIED) {
  817                             tsize = np->n_size;
  818                             mtx_unlock(&np->n_mtx);
  819                             if (vap->va_size == 0)
  820                                 error = nfs_vinvalbuf(vp, 0, td, 1);
  821                             else
  822                                 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
  823                             if (error) {
  824                                 vnode_pager_setsize(vp, tsize);
  825                                 goto out;
  826                             }
  827                         } else
  828                             mtx_unlock(&np->n_mtx);
  829                         /*
  830                          * np->n_size has already been set to vap->va_size
  831                          * in nfs_meta_setsize(). We must set it again since
  832                          * nfs_loadattrcache() could be called through
  833                          * nfs_meta_setsize() and could modify np->n_size.
  834                          */
  835                         mtx_lock(&np->n_mtx);
  836                         np->n_vattr.va_size = np->n_size = vap->va_size;
  837                         mtx_unlock(&np->n_mtx);
  838                 };
  839         } else {
  840                 mtx_lock(&np->n_mtx);
  841                 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 
  842                     (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
  843                         mtx_unlock(&np->n_mtx);
  844                         if ((error = nfs_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
  845                             (error == EINTR || error == EIO))
  846                                 return error;
  847                 } else
  848                         mtx_unlock(&np->n_mtx);
  849         }
  850         error = nfs_setattrrpc(vp, vap, ap->a_cred);
  851         if (error && vap->va_size != VNOVAL) {
  852                 mtx_lock(&np->n_mtx);
  853                 np->n_size = np->n_vattr.va_size = tsize;
  854                 vnode_pager_setsize(vp, tsize);
  855                 mtx_unlock(&np->n_mtx);
  856         }
  857 out:
  858         return (error);
  859 }
  860 
  861 /*
  862  * Do an nfs setattr rpc.
  863  */
  864 static int
  865 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred)
  866 {
  867         struct nfsv2_sattr *sp;
  868         struct nfsnode *np = VTONFS(vp);
  869         caddr_t bpos, dpos;
  870         u_int32_t *tl;
  871         int error = 0, i, wccflag = NFSV3_WCCRATTR;
  872         struct mbuf *mreq, *mrep, *md, *mb;
  873         int v3 = NFS_ISV3(vp);
  874 
  875         nfsstats.rpccnt[NFSPROC_SETATTR]++;
  876         mreq = m_get2(NFSX_FH(v3) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0);
  877         mb = mreq;
  878         bpos = mtod(mb, caddr_t);
  879         nfsm_fhtom(vp, v3);
  880         if (v3) {
  881                 nfsm_v3attrbuild(vap, TRUE);
  882                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
  883                 *tl = nfs_false;
  884         } else {
  885                 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
  886                 if (vap->va_mode == (mode_t)VNOVAL)
  887                         sp->sa_mode = nfs_xdrneg1;
  888                 else
  889                         sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode);
  890                 if (vap->va_uid == (uid_t)VNOVAL)
  891                         sp->sa_uid = nfs_xdrneg1;
  892                 else
  893                         sp->sa_uid = txdr_unsigned(vap->va_uid);
  894                 if (vap->va_gid == (gid_t)VNOVAL)
  895                         sp->sa_gid = nfs_xdrneg1;
  896                 else
  897                         sp->sa_gid = txdr_unsigned(vap->va_gid);
  898                 sp->sa_size = txdr_unsigned(vap->va_size);
  899                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
  900                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
  901         }
  902         nfsm_request(vp, NFSPROC_SETATTR, curthread, cred);
  903         if (v3) {
  904                 mtx_lock(&np->n_mtx);
  905                 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  906                         np->n_accesscache[i].stamp = 0;
  907                 mtx_unlock(&np->n_mtx);
  908                 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
  909                 nfsm_wcc_data(vp, wccflag);
  910         } else
  911                 nfsm_loadattr(vp, NULL);
  912         m_freem(mrep);
  913 nfsmout:
  914         return (error);
  915 }
  916 
  917 /*
  918  * nfs lookup call, one step at a time...
  919  * First look in cache
  920  * If not found, unlock the directory nfsnode and do the rpc
  921  */
  922 static int
  923 nfs_lookup(struct vop_lookup_args *ap)
  924 {
  925         struct componentname *cnp = ap->a_cnp;
  926         struct vnode *dvp = ap->a_dvp;
  927         struct vnode **vpp = ap->a_vpp;
  928         struct mount *mp = dvp->v_mount;
  929         struct vattr dvattr, vattr;
  930         struct timespec nctime;
  931         int flags = cnp->cn_flags;
  932         struct vnode *newvp;
  933         struct nfsmount *nmp;
  934         caddr_t bpos, dpos;
  935         struct mbuf *mreq, *mrep, *md, *mb;
  936         long len;
  937         nfsfh_t *fhp;
  938         struct nfsnode *np, *newnp;
  939         int error = 0, attrflag, dattrflag, fhsize, ltype, ncticks;
  940         int v3 = NFS_ISV3(dvp);
  941         struct thread *td = cnp->cn_thread;
  942 
  943         *vpp = NULLVP;
  944         if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
  945             (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
  946                 return (EROFS);
  947         if (dvp->v_type != VDIR)
  948                 return (ENOTDIR);
  949         nmp = VFSTONFS(mp);
  950         np = VTONFS(dvp);
  951         if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) {
  952                 *vpp = NULLVP;
  953                 return (error);
  954         }
  955         error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
  956         if (error > 0 && error != ENOENT)
  957                 return (error);
  958         if (error == -1) {
  959                 /*
  960                  * Lookups of "." are special and always return the
  961                  * current directory.  cache_lookup() already handles
  962                  * associated locking bookkeeping, etc.
  963                  */
  964                 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
  965                         /* XXX: Is this really correct? */
  966                         if (cnp->cn_nameiop != LOOKUP &&
  967                             (flags & ISLASTCN))
  968                                 cnp->cn_flags |= SAVENAME;
  969                         return (0);
  970                 }
  971 
  972                 /*
  973                  * We only accept a positive hit in the cache if the
  974                  * change time of the file matches our cached copy.
  975                  * Otherwise, we discard the cache entry and fallback
  976                  * to doing a lookup RPC.  We also only trust cache
  977                  * entries for less than nm_nametimeo seconds.
  978                  *
  979                  * To better handle stale file handles and attributes,
  980                  * clear the attribute cache of this node if it is a
  981                  * leaf component, part of an open() call, and not
  982                  * locally modified before fetching the attributes.
  983                  * This should allow stale file handles to be detected
  984                  * here where we can fall back to a LOOKUP RPC to
  985                  * recover rather than having nfs_open() detect the
  986                  * stale file handle and failing open(2) with ESTALE.
  987                  */
  988                 newvp = *vpp;
  989                 newnp = VTONFS(newvp);
  990                 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
  991                     (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
  992                     !(newnp->n_flag & NMODIFIED)) {
  993                         mtx_lock(&newnp->n_mtx);
  994                         newnp->n_attrstamp = 0;
  995                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
  996                         mtx_unlock(&newnp->n_mtx);
  997                 }
  998                 if ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
  999                     VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
 1000                     timespeccmp(&vattr.va_ctime, &nctime, ==)) {
 1001                         nfsstats.lookupcache_hits++;
 1002                         if (cnp->cn_nameiop != LOOKUP &&
 1003                             (flags & ISLASTCN))
 1004                                 cnp->cn_flags |= SAVENAME;
 1005                         return (0);
 1006                 }
 1007                 cache_purge(newvp);
 1008                 if (dvp != newvp)
 1009                         vput(newvp);
 1010                 else 
 1011                         vrele(newvp);
 1012                 *vpp = NULLVP;
 1013         } else if (error == ENOENT) {
 1014                 if (dvp->v_iflag & VI_DOOMED)
 1015                         return (ENOENT);
 1016                 /*
 1017                  * We only accept a negative hit in the cache if the
 1018                  * modification time of the parent directory matches
 1019                  * the cached copy in the name cache entry.
 1020                  * Otherwise, we discard all of the negative cache
 1021                  * entries for this directory.  We also only trust
 1022                  * negative cache entries for up to nm_negnametimeo
 1023                  * seconds.
 1024                  */
 1025                 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
 1026                     VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
 1027                     timespeccmp(&vattr.va_mtime, &nctime, ==)) {
 1028                         nfsstats.lookupcache_hits++;
 1029                         return (ENOENT);
 1030                 }
 1031                 cache_purge_negative(dvp);
 1032         }
 1033 
 1034         attrflag = dattrflag = 0;
 1035         error = 0;
 1036         newvp = NULLVP;
 1037         nfsstats.lookupcache_misses++;
 1038         nfsstats.rpccnt[NFSPROC_LOOKUP]++;
 1039         len = cnp->cn_namelen;
 1040         mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len), M_WAITOK,
 1041             MT_DATA, 0);
 1042         mb = mreq;
 1043         bpos = mtod(mb, caddr_t);
 1044         nfsm_fhtom(dvp, v3);
 1045         nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
 1046         nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred);
 1047         if (error) {
 1048                 if (v3) {
 1049                         nfsm_postop_attr_va(dvp, dattrflag, &vattr);
 1050                         m_freem(mrep);
 1051                 }
 1052                 goto nfsmout;
 1053         }
 1054         nfsm_getfh(fhp, fhsize, v3);
 1055 
 1056         /*
 1057          * Handle RENAME case...
 1058          */
 1059         if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 1060                 if (NFS_CMPFH(np, fhp, fhsize)) {
 1061                         m_freem(mrep);
 1062                         return (EISDIR);
 1063                 }
 1064                 error = nfs_nget(mp, fhp, fhsize, &np, LK_EXCLUSIVE);
 1065                 if (error) {
 1066                         m_freem(mrep);
 1067                         return (error);
 1068                 }
 1069                 newvp = NFSTOV(np);
 1070                 if (v3) {
 1071                         nfsm_postop_attr(newvp, attrflag);
 1072                         nfsm_postop_attr(dvp, attrflag);
 1073                 } else
 1074                         nfsm_loadattr(newvp, NULL);
 1075                 *vpp = newvp;
 1076                 m_freem(mrep);
 1077                 cnp->cn_flags |= SAVENAME;
 1078                 return (0);
 1079         }
 1080 
 1081         if (flags & ISDOTDOT) {
 1082                 ltype = VOP_ISLOCKED(dvp);
 1083                 error = vfs_busy(mp, MBF_NOWAIT);
 1084                 if (error != 0) {
 1085                         vfs_ref(mp);
 1086                         VOP_UNLOCK(dvp, 0);
 1087                         error = vfs_busy(mp, 0);
 1088                         vn_lock(dvp, ltype | LK_RETRY);
 1089                         vfs_rel(mp);
 1090                         if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
 1091                                 vfs_unbusy(mp);
 1092                                 error = ENOENT;
 1093                         }
 1094                         if (error != 0) {
 1095                                 m_freem(mrep);
 1096                                 return (error);
 1097                         }
 1098                 }
 1099                 VOP_UNLOCK(dvp, 0);
 1100                 error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags);
 1101                 if (error == 0)
 1102                         newvp = NFSTOV(np);
 1103                 vfs_unbusy(mp);
 1104                 if (newvp != dvp)
 1105                         vn_lock(dvp, ltype | LK_RETRY);
 1106                 if (dvp->v_iflag & VI_DOOMED) {
 1107                         if (error == 0) {
 1108                                 if (newvp == dvp)
 1109                                         vrele(newvp);
 1110                                 else
 1111                                         vput(newvp);
 1112                         }
 1113                         error = ENOENT;
 1114                 }
 1115                 if (error) {
 1116                         m_freem(mrep);
 1117                         return (error);
 1118                 }
 1119         } else if (NFS_CMPFH(np, fhp, fhsize)) {
 1120                 VREF(dvp);
 1121                 newvp = dvp;
 1122         } else {
 1123                 error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags);
 1124                 if (error) {
 1125                         m_freem(mrep);
 1126                         return (error);
 1127                 }
 1128                 newvp = NFSTOV(np);
 1129 
 1130                 /*
 1131                  * Flush the attribute cache when opening a leaf node
 1132                  * to ensure that fresh attributes are fetched in
 1133                  * nfs_open() if we are unable to fetch attributes
 1134                  * from the LOOKUP reply.
 1135                  */
 1136                 if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
 1137                     !(np->n_flag & NMODIFIED)) {
 1138                         mtx_lock(&np->n_mtx);
 1139                         np->n_attrstamp = 0;
 1140                         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
 1141                         mtx_unlock(&np->n_mtx);
 1142                 }
 1143         }
 1144         if (v3) {
 1145                 nfsm_postop_attr_va(newvp, attrflag, &vattr);
 1146                 nfsm_postop_attr_va(dvp, dattrflag, &dvattr);
 1147         } else {
 1148                 nfsm_loadattr(newvp, &vattr);
 1149                 attrflag = 1;
 1150         }
 1151         if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 1152                 cnp->cn_flags |= SAVENAME;
 1153         if ((cnp->cn_flags & MAKEENTRY) &&
 1154             (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
 1155             attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
 1156                 cache_enter_time(dvp, newvp, cnp, &vattr.va_ctime,
 1157                     newvp->v_type != VDIR ? NULL : &dvattr.va_ctime);
 1158         *vpp = newvp;
 1159         m_freem(mrep);
 1160 nfsmout:
 1161         if (error) {
 1162                 if (newvp != NULLVP) {
 1163                         vput(newvp);
 1164                         *vpp = NULLVP;
 1165                 }
 1166 
 1167                 if (error != ENOENT)
 1168                         goto done;
 1169 
 1170                 /* The requested file was not found. */
 1171                 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 1172                     (flags & ISLASTCN)) {
 1173                         /*
 1174                          * XXX: UFS does a full VOP_ACCESS(dvp,
 1175                          * VWRITE) here instead of just checking
 1176                          * MNT_RDONLY.
 1177                          */
 1178                         if (mp->mnt_flag & MNT_RDONLY)
 1179                                 return (EROFS);
 1180                         cnp->cn_flags |= SAVENAME;
 1181                         return (EJUSTRETURN);
 1182                 }
 1183 
 1184                 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE &&
 1185                     dattrflag) {
 1186                         /*
 1187                          * Cache the modification time of the parent
 1188                          * directory from the post-op attributes in
 1189                          * the name cache entry.  The negative cache
 1190                          * entry will be ignored once the directory
 1191                          * has changed.  Don't bother adding the entry
 1192                          * if the directory has already changed.
 1193                          */
 1194                         mtx_lock(&np->n_mtx);
 1195                         if (timespeccmp(&np->n_vattr.va_mtime,
 1196                             &vattr.va_mtime, ==)) {
 1197                                 mtx_unlock(&np->n_mtx);
 1198                                 cache_enter_time(dvp, NULL, cnp,
 1199                                     &vattr.va_mtime, NULL);
 1200                         } else
 1201                                 mtx_unlock(&np->n_mtx);
 1202                 }
 1203                 return (ENOENT);
 1204         }
 1205 done:
 1206         return (error);
 1207 }
 1208 
 1209 /*
 1210  * nfs read call.
 1211  * Just call nfs_bioread() to do the work.
 1212  */
 1213 static int
 1214 nfs_read(struct vop_read_args *ap)
 1215 {
 1216         struct vnode *vp = ap->a_vp;
 1217 
 1218         switch (vp->v_type) {
 1219         case VREG:
 1220                 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
 1221         case VDIR:
 1222                 return (EISDIR);
 1223         default:
 1224                 return (EOPNOTSUPP);
 1225         }
 1226 }
 1227 
 1228 /*
 1229  * nfs readlink call
 1230  */
 1231 static int
 1232 nfs_readlink(struct vop_readlink_args *ap)
 1233 {
 1234         struct vnode *vp = ap->a_vp;
 1235 
 1236         if (vp->v_type != VLNK)
 1237                 return (EINVAL);
 1238         return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred));
 1239 }
 1240 
 1241 /*
 1242  * Do a readlink rpc.
 1243  * Called by nfs_doio() from below the buffer cache.
 1244  */
 1245 int
 1246 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1247 {
 1248         caddr_t bpos, dpos;
 1249         int error = 0, len, attrflag;
 1250         struct mbuf *mreq, *mrep, *md, *mb;
 1251         int v3 = NFS_ISV3(vp);
 1252 
 1253         nfsstats.rpccnt[NFSPROC_READLINK]++;
 1254         mreq = m_get2(NFSX_FH(v3), M_WAITOK, MT_DATA, 0);
 1255         mb = mreq;
 1256         bpos = mtod(mb, caddr_t);
 1257         nfsm_fhtom(vp, v3);
 1258         nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred);
 1259         if (v3)
 1260                 nfsm_postop_attr(vp, attrflag);
 1261         if (!error) {
 1262                 nfsm_strsiz(len, NFS_MAXPATHLEN);
 1263                 if (len == NFS_MAXPATHLEN) {
 1264                         struct nfsnode *np = VTONFS(vp);
 1265                         mtx_lock(&np->n_mtx);
 1266                         if (np->n_size && np->n_size < NFS_MAXPATHLEN)
 1267                                 len = np->n_size;
 1268                         mtx_unlock(&np->n_mtx);
 1269                 }
 1270                 nfsm_mtouio(uiop, len);
 1271         }
 1272         m_freem(mrep);
 1273 nfsmout:
 1274         return (error);
 1275 }
 1276 
 1277 /*
 1278  * nfs read rpc call
 1279  * Ditto above
 1280  */
 1281 int
 1282 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 1283 {
 1284         u_int32_t *tl;
 1285         caddr_t bpos, dpos;
 1286         struct mbuf *mreq, *mrep, *md, *mb;
 1287         struct nfsmount *nmp;
 1288         off_t end;
 1289         int error = 0, len, retlen, tsiz, eof, attrflag;
 1290         int v3 = NFS_ISV3(vp);
 1291         int rsize;
 1292 
 1293 #ifndef nolint
 1294         eof = 0;
 1295 #endif
 1296         nmp = VFSTONFS(vp->v_mount);
 1297         tsiz = uiop->uio_resid;
 1298         mtx_lock(&nmp->nm_mtx);
 1299         end = uiop->uio_offset + tsiz;
 1300         if (end > nmp->nm_maxfilesize || end < uiop->uio_offset) {
 1301                 mtx_unlock(&nmp->nm_mtx);
 1302                 return (EFBIG);
 1303         }
 1304         rsize = nmp->nm_rsize;
 1305         mtx_unlock(&nmp->nm_mtx);
 1306         while (tsiz > 0) {
 1307                 nfsstats.rpccnt[NFSPROC_READ]++;
 1308                 len = (tsiz > rsize) ? rsize : tsiz;
 1309                 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED * 3, M_WAITOK,
 1310                     MT_DATA, 0);
 1311                 mb = mreq;
 1312                 bpos = mtod(mb, caddr_t);
 1313                 nfsm_fhtom(vp, v3);
 1314                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3);
 1315                 if (v3) {
 1316                         txdr_hyper(uiop->uio_offset, tl);
 1317                         *(tl + 2) = txdr_unsigned(len);
 1318                 } else {
 1319                         *tl++ = txdr_unsigned(uiop->uio_offset);
 1320                         *tl++ = txdr_unsigned(len);
 1321                         *tl = 0;
 1322                 }
 1323                 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred);
 1324                 if (v3) {
 1325                         nfsm_postop_attr(vp, attrflag);
 1326                         if (error) {
 1327                                 m_freem(mrep);
 1328                                 goto nfsmout;
 1329                         }
 1330                         tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED);
 1331                         eof = fxdr_unsigned(int, *(tl + 1));
 1332                 } else {
 1333                         nfsm_loadattr(vp, NULL);
 1334                 }
 1335                 nfsm_strsiz(retlen, rsize);
 1336                 nfsm_mtouio(uiop, retlen);
 1337                 m_freem(mrep);
 1338                 tsiz -= retlen;
 1339                 if (v3) {
 1340                         if (eof || retlen == 0) {
 1341                                 tsiz = 0;
 1342                         }
 1343                 } else if (retlen < len) {
 1344                         tsiz = 0;
 1345                 }
 1346         }
 1347 nfsmout:
 1348         return (error);
 1349 }
 1350 
 1351 /*
 1352  * nfs write call
 1353  */
 1354 int
 1355 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
 1356              int *iomode, int *must_commit)
 1357 {
 1358         u_int32_t *tl;
 1359         int32_t backup;
 1360         caddr_t bpos, dpos;
 1361         struct mbuf *mreq, *mrep, *md, *mb;
 1362         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 1363         off_t end;
 1364         int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit;
 1365         int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC;
 1366         int wsize;
 1367         
 1368         KASSERT(uiop->uio_iovcnt == 1, ("nfs: writerpc iovcnt > 1"));
 1369         *must_commit = 0;
 1370         tsiz = uiop->uio_resid;
 1371         mtx_lock(&nmp->nm_mtx);
 1372         end = uiop->uio_offset + tsiz;
 1373         if (end > nmp->nm_maxfilesize || end < uiop->uio_offset) {
 1374                 mtx_unlock(&nmp->nm_mtx);               
 1375                 return (EFBIG);
 1376         }
 1377         wsize = nmp->nm_wsize;
 1378         mtx_unlock(&nmp->nm_mtx);
 1379         while (tsiz > 0) {
 1380                 nfsstats.rpccnt[NFSPROC_WRITE]++;
 1381                 len = (tsiz > wsize) ? wsize : tsiz;
 1382                 mreq = m_get2(NFSX_FH(v3) + 5 * NFSX_UNSIGNED, M_WAITOK,
 1383                     MT_DATA, 0);
 1384                 mb = mreq;
 1385                 bpos = mtod(mb, caddr_t);
 1386                 nfsm_fhtom(vp, v3);
 1387                 if (v3) {
 1388                         tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
 1389                         txdr_hyper(uiop->uio_offset, tl);
 1390                         tl += 2;
 1391                         *tl++ = txdr_unsigned(len);
 1392                         *tl++ = txdr_unsigned(*iomode);
 1393                         *tl = txdr_unsigned(len);
 1394                 } else {
 1395                         u_int32_t x;
 1396 
 1397                         tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED);
 1398                         /* Set both "begin" and "current" to non-garbage. */
 1399                         x = txdr_unsigned((u_int32_t)uiop->uio_offset);
 1400                         *tl++ = x;      /* "begin offset" */
 1401                         *tl++ = x;      /* "current offset" */
 1402                         x = txdr_unsigned(len);
 1403                         *tl++ = x;      /* total to this offset */
 1404                         *tl = x;        /* size of this write */
 1405                 }
 1406                 nfsm_uiotom(uiop, len);
 1407                 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred);
 1408                 if (v3) {
 1409                         wccflag = NFSV3_WCCCHK;
 1410                         nfsm_wcc_data(vp, wccflag);
 1411                         if (!error) {
 1412                                 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED
 1413                                         + NFSX_V3WRITEVERF);
 1414                                 rlen = fxdr_unsigned(int, *tl++);
 1415                                 if (rlen == 0) {
 1416                                         error = NFSERR_IO;
 1417                                         m_freem(mrep);
 1418                                         break;
 1419                                 } else if (rlen < len) {
 1420                                         backup = len - rlen;
 1421                                         uiop->uio_iov->iov_base =
 1422                                             (char *)uiop->uio_iov->iov_base -
 1423                                             backup;
 1424                                         uiop->uio_iov->iov_len += backup;
 1425                                         uiop->uio_offset -= backup;
 1426                                         uiop->uio_resid += backup;
 1427                                         len = rlen;
 1428                                 }
 1429                                 commit = fxdr_unsigned(int, *tl++);
 1430 
 1431                                 /*
 1432                                  * Return the lowest committment level
 1433                                  * obtained by any of the RPCs.
 1434                                  */
 1435                                 if (committed == NFSV3WRITE_FILESYNC)
 1436                                         committed = commit;
 1437                                 else if (committed == NFSV3WRITE_DATASYNC &&
 1438                                         commit == NFSV3WRITE_UNSTABLE)
 1439                                         committed = commit;
 1440                                 mtx_lock(&nmp->nm_mtx);
 1441                                 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){
 1442                                     bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
 1443                                         NFSX_V3WRITEVERF);
 1444                                     nmp->nm_state |= NFSSTA_HASWRITEVERF;
 1445                                 } else if (bcmp((caddr_t)tl,
 1446                                     (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) {
 1447                                     *must_commit = 1;
 1448                                     bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
 1449                                         NFSX_V3WRITEVERF);
 1450                                 }
 1451                                 mtx_unlock(&nmp->nm_mtx);
 1452                         }
 1453                 } else {
 1454                         nfsm_loadattr(vp, NULL);
 1455                 }
 1456                 if (wccflag) {
 1457                         mtx_lock(&(VTONFS(vp))->n_mtx);
 1458                         VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime;
 1459                         mtx_unlock(&(VTONFS(vp))->n_mtx);
 1460                 }
 1461                 m_freem(mrep);
 1462                 if (error)
 1463                         break;
 1464                 tsiz -= len;
 1465         }
 1466 nfsmout:
 1467         if (DOINGASYNC(vp))
 1468                 committed = NFSV3WRITE_FILESYNC;
 1469         *iomode = committed;
 1470         if (error)
 1471                 uiop->uio_resid = tsiz;
 1472         return (error);
 1473 }
 1474 
 1475 /*
 1476  * nfs mknod rpc
 1477  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
 1478  * mode set to specify the file type and the size field for rdev.
 1479  */
 1480 static int
 1481 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 1482     struct vattr *vap)
 1483 {
 1484         struct nfsv2_sattr *sp;
 1485         u_int32_t *tl;
 1486         struct vnode *newvp = NULL;
 1487         struct nfsnode *np = NULL;
 1488         struct vattr vattr;
 1489         caddr_t bpos, dpos;
 1490         int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
 1491         struct mbuf *mreq, *mrep, *md, *mb;
 1492         u_int32_t rdev;
 1493         int v3 = NFS_ISV3(dvp);
 1494 
 1495         if (vap->va_type == VCHR || vap->va_type == VBLK)
 1496                 rdev = txdr_unsigned(vap->va_rdev);
 1497         else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 1498                 rdev = nfs_xdrneg1;
 1499         else {
 1500                 return (EOPNOTSUPP);
 1501         }
 1502         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
 1503                 return (error);
 1504         nfsstats.rpccnt[NFSPROC_MKNOD]++;
 1505         mreq = m_get2(NFSX_FH(v3) + 4 * NFSX_UNSIGNED +
 1506             nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0);
 1507         mb = mreq;
 1508         bpos = mtod(mb, caddr_t);
 1509         nfsm_fhtom(dvp, v3);
 1510         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1511         if (v3) {
 1512                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
 1513                 *tl++ = vtonfsv3_type(vap->va_type);
 1514                 nfsm_v3attrbuild(vap, FALSE);
 1515                 if (vap->va_type == VCHR || vap->va_type == VBLK) {
 1516                         tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
 1517                         *tl++ = txdr_unsigned(major(vap->va_rdev));
 1518                         *tl = txdr_unsigned(minor(vap->va_rdev));
 1519                 }
 1520         } else {
 1521                 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
 1522                 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
 1523                 sp->sa_uid = nfs_xdrneg1;
 1524                 sp->sa_gid = nfs_xdrneg1;
 1525                 sp->sa_size = rdev;
 1526                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 1527                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 1528         }
 1529         nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred);
 1530         if (!error) {
 1531                 nfsm_mtofh(dvp, newvp, v3, gotvp);
 1532                 if (!gotvp) {
 1533                         if (newvp) {
 1534                                 vput(newvp);
 1535                                 newvp = NULL;
 1536                         }
 1537                         error = nfs_lookitup(dvp, cnp->cn_nameptr,
 1538                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
 1539                         if (!error)
 1540                                 newvp = NFSTOV(np);
 1541                 }
 1542         }
 1543         if (v3)
 1544                 nfsm_wcc_data(dvp, wccflag);
 1545         m_freem(mrep);
 1546 nfsmout:
 1547         if (error) {
 1548                 if (newvp)
 1549                         vput(newvp);
 1550         } else {
 1551                 *vpp = newvp;
 1552         }
 1553         mtx_lock(&(VTONFS(dvp))->n_mtx);
 1554         VTONFS(dvp)->n_flag |= NMODIFIED;
 1555         if (!wccflag) {
 1556                 VTONFS(dvp)->n_attrstamp = 0;
 1557                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1558         }
 1559         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 1560         return (error);
 1561 }
 1562 
 1563 /*
 1564  * nfs mknod vop
 1565  * just call nfs_mknodrpc() to do the work.
 1566  */
 1567 /* ARGSUSED */
 1568 static int
 1569 nfs_mknod(struct vop_mknod_args *ap)
 1570 {
 1571         return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
 1572 }
 1573 
 1574 static u_long create_verf;
 1575 /*
 1576  * nfs file create call
 1577  */
 1578 static int
 1579 nfs_create(struct vop_create_args *ap)
 1580 {
 1581         struct vnode *dvp = ap->a_dvp;
 1582         struct vattr *vap = ap->a_vap;
 1583         struct componentname *cnp = ap->a_cnp;
 1584         struct nfsv2_sattr *sp;
 1585         u_int32_t *tl;
 1586         struct nfsnode *np = NULL;
 1587         struct vnode *newvp = NULL;
 1588         caddr_t bpos, dpos;
 1589         int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;
 1590         struct mbuf *mreq, *mrep, *md, *mb;
 1591         struct vattr vattr;
 1592         int v3 = NFS_ISV3(dvp);
 1593 
 1594         /*
 1595          * Oops, not for me..
 1596          */
 1597         if (vap->va_type == VSOCK) {
 1598                 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap);
 1599                 return (error);
 1600         }
 1601 
 1602         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) {
 1603                 return (error);
 1604         }
 1605         if (vap->va_vaflags & VA_EXCLUSIVE)
 1606                 fmode |= O_EXCL;
 1607 again:
 1608         nfsstats.rpccnt[NFSPROC_CREATE]++;
 1609         mreq = m_get2(NFSX_FH(v3) + 2 * NFSX_UNSIGNED +
 1610             nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0);
 1611         mb = mreq;
 1612         bpos = mtod(mb, caddr_t);
 1613         nfsm_fhtom(dvp, v3);
 1614         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1615         if (v3) {
 1616                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
 1617                 if (fmode & O_EXCL) {
 1618                         *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
 1619                         tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF);
 1620 #ifdef INET
 1621                         CURVNET_SET(CRED_TO_VNET(cnp->cn_cred));
 1622                         IN_IFADDR_RLOCK();
 1623                         if (!TAILQ_EMPTY(&V_in_ifaddrhead))
 1624                                 *tl++ = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr;
 1625                         else
 1626 #endif
 1627                                 *tl++ = create_verf;
 1628 #ifdef INET
 1629                         IN_IFADDR_RUNLOCK();
 1630                         CURVNET_RESTORE();
 1631 #endif
 1632                         *tl = ++create_verf;
 1633                 } else {
 1634                         *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED);
 1635                         nfsm_v3attrbuild(vap, FALSE);
 1636                 }
 1637         } else {
 1638                 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
 1639                 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
 1640                 sp->sa_uid = nfs_xdrneg1;
 1641                 sp->sa_gid = nfs_xdrneg1;
 1642                 sp->sa_size = 0;
 1643                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 1644                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 1645         }
 1646         nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred);
 1647         if (!error) {
 1648                 nfsm_mtofh(dvp, newvp, v3, gotvp);
 1649                 if (!gotvp) {
 1650                         if (newvp) {
 1651                                 vput(newvp);
 1652                                 newvp = NULL;
 1653                         }
 1654                         error = nfs_lookitup(dvp, cnp->cn_nameptr,
 1655                             cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
 1656                         if (!error)
 1657                                 newvp = NFSTOV(np);
 1658                 }
 1659         }
 1660         if (v3)
 1661                 nfsm_wcc_data(dvp, wccflag);
 1662         m_freem(mrep);
 1663 nfsmout:
 1664         if (error) {
 1665                 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) {
 1666                         fmode &= ~O_EXCL;
 1667                         goto again;
 1668                 }
 1669                 if (newvp)
 1670                         vput(newvp);
 1671         } else if (v3 && (fmode & O_EXCL)) {
 1672                 /*
 1673                  * We are normally called with only a partially initialized
 1674                  * VAP.  Since the NFSv3 spec says that server may use the
 1675                  * file attributes to store the verifier, the spec requires
 1676                  * us to do a SETATTR RPC. FreeBSD servers store the verifier
 1677                  * in atime, but we can't really assume that all servers will
 1678                  * so we ensure that our SETATTR sets both atime and mtime.
 1679                  */
 1680                 if (vap->va_mtime.tv_sec == VNOVAL)
 1681                         vfs_timestamp(&vap->va_mtime);
 1682                 if (vap->va_atime.tv_sec == VNOVAL)
 1683                         vap->va_atime = vap->va_mtime;
 1684                 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred);
 1685                 if (error)
 1686                         vput(newvp);
 1687         }
 1688         if (!error) {
 1689                 *ap->a_vpp = newvp;
 1690         }
 1691         mtx_lock(&(VTONFS(dvp))->n_mtx);
 1692         VTONFS(dvp)->n_flag |= NMODIFIED;
 1693         if (!wccflag) {
 1694                 VTONFS(dvp)->n_attrstamp = 0;
 1695                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1696         }
 1697         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 1698         return (error);
 1699 }
 1700 
 1701 /*
 1702  * nfs file remove call
 1703  * To try and make nfs semantics closer to ufs semantics, a file that has
 1704  * other processes using the vnode is renamed instead of removed and then
 1705  * removed later on the last close.
 1706  * - If v_usecount > 1
 1707  *        If a rename is not already in the works
 1708  *           call nfs_sillyrename() to set it up
 1709  *     else
 1710  *        do the remove rpc
 1711  */
 1712 static int
 1713 nfs_remove(struct vop_remove_args *ap)
 1714 {
 1715         struct vnode *vp = ap->a_vp;
 1716         struct vnode *dvp = ap->a_dvp;
 1717         struct componentname *cnp = ap->a_cnp;
 1718         struct nfsnode *np = VTONFS(vp);
 1719         int error = 0;
 1720         struct vattr vattr;
 1721 
 1722         KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
 1723         KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
 1724         if (vp->v_type == VDIR)
 1725                 error = EPERM;
 1726         else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 1727             !VOP_GETATTR(vp, &vattr, cnp->cn_cred) && vattr.va_nlink > 1)) {
 1728                 /*
 1729                  * Purge the name cache so that the chance of a lookup for
 1730                  * the name succeeding while the remove is in progress is
 1731                  * minimized. Without node locking it can still happen, such
 1732                  * that an I/O op returns ESTALE, but since you get this if
 1733                  * another host removes the file..
 1734                  */
 1735                 cache_purge(vp);
 1736                 /*
 1737                  * throw away biocache buffers, mainly to avoid
 1738                  * unnecessary delayed writes later.
 1739                  */
 1740                 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1);
 1741                 /* Do the rpc */
 1742                 if (error != EINTR && error != EIO)
 1743                         error = nfs_removerpc(dvp, cnp->cn_nameptr,
 1744                                 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
 1745                 /*
 1746                  * Kludge City: If the first reply to the remove rpc is lost..
 1747                  *   the reply to the retransmitted request will be ENOENT
 1748                  *   since the file was in fact removed
 1749                  *   Therefore, we cheat and return success.
 1750                  */
 1751                 if (error == ENOENT)
 1752                         error = 0;
 1753         } else if (!np->n_sillyrename)
 1754                 error = nfs_sillyrename(dvp, vp, cnp);
 1755         mtx_lock(&np->n_mtx);
 1756         np->n_attrstamp = 0;
 1757         mtx_unlock(&np->n_mtx);
 1758         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 1759         return (error);
 1760 }
 1761 
 1762 /*
 1763  * nfs file remove rpc called from nfs_inactive
 1764  */
 1765 int
 1766 nfs_removeit(struct sillyrename *sp)
 1767 {
 1768         /*
 1769          * Make sure that the directory vnode is still valid.
 1770          * XXX we should lock sp->s_dvp here.
 1771          */
 1772         if (sp->s_dvp->v_type == VBAD)
 1773                 return (0);
 1774         return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 1775                 NULL));
 1776 }
 1777 
 1778 /*
 1779  * Nfs remove rpc, called from nfs_remove() and nfs_removeit().
 1780  */
 1781 static int
 1782 nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
 1783     struct ucred *cred, struct thread *td)
 1784 {
 1785         caddr_t bpos, dpos;
 1786         int error = 0, wccflag = NFSV3_WCCRATTR;
 1787         struct mbuf *mreq, *mrep, *md, *mb;
 1788         int v3 = NFS_ISV3(dvp);
 1789 
 1790         nfsstats.rpccnt[NFSPROC_REMOVE]++;
 1791         mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen),
 1792             M_WAITOK, MT_DATA, 0);
 1793         mb = mreq;
 1794         bpos = mtod(mb, caddr_t);
 1795         nfsm_fhtom(dvp, v3);
 1796         nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
 1797         nfsm_request(dvp, NFSPROC_REMOVE, td, cred);
 1798         if (v3)
 1799                 nfsm_wcc_data(dvp, wccflag);
 1800         m_freem(mrep);
 1801 nfsmout:
 1802         mtx_lock(&(VTONFS(dvp))->n_mtx);
 1803         VTONFS(dvp)->n_flag |= NMODIFIED;
 1804         if (!wccflag) {
 1805                 VTONFS(dvp)->n_attrstamp = 0;
 1806                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 1807         }
 1808         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 1809         return (error);
 1810 }
 1811 
 1812 /*
 1813  * nfs file rename call
 1814  */
 1815 static int
 1816 nfs_rename(struct vop_rename_args *ap)
 1817 {
 1818         struct vnode *fvp = ap->a_fvp;
 1819         struct vnode *tvp = ap->a_tvp;
 1820         struct vnode *fdvp = ap->a_fdvp;
 1821         struct vnode *tdvp = ap->a_tdvp;
 1822         struct componentname *tcnp = ap->a_tcnp;
 1823         struct componentname *fcnp = ap->a_fcnp;
 1824         int error;
 1825 
 1826         KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
 1827             (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
 1828         /* Check for cross-device rename */
 1829         if ((fvp->v_mount != tdvp->v_mount) ||
 1830             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1831                 error = EXDEV;
 1832                 goto out;
 1833         }
 1834 
 1835         if (fvp == tvp) {
 1836                 nfs_printf("nfs_rename: fvp == tvp (can't happen)\n");
 1837                 error = 0;
 1838                 goto out;
 1839         }
 1840         if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
 1841                 goto out;
 1842 
 1843         /*
 1844          * We have to flush B_DELWRI data prior to renaming
 1845          * the file.  If we don't, the delayed-write buffers
 1846          * can be flushed out later after the file has gone stale
 1847          * under NFSV3.  NFSV2 does not have this problem because
 1848          * ( as far as I can tell ) it flushes dirty buffers more
 1849          * often.
 1850          * 
 1851          * Skip the rename operation if the fsync fails, this can happen
 1852          * due to the server's volume being full, when we pushed out data
 1853          * that was written back to our cache earlier. Not checking for
 1854          * this condition can result in potential (silent) data loss.
 1855          */
 1856         error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
 1857         VOP_UNLOCK(fvp, 0);
 1858         if (!error && tvp)
 1859                 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
 1860         if (error)
 1861                 goto out;
 1862 
 1863         /*
 1864          * If the tvp exists and is in use, sillyrename it before doing the
 1865          * rename of the new file over it.
 1866          * XXX Can't sillyrename a directory.
 1867          */
 1868         if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 1869                 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
 1870                 vput(tvp);
 1871                 tvp = NULL;
 1872         }
 1873 
 1874         error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 1875                 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 1876                 tcnp->cn_thread);
 1877 
 1878         if (fvp->v_type == VDIR) {
 1879                 if (tvp != NULL && tvp->v_type == VDIR)
 1880                         cache_purge(tdvp);
 1881                 cache_purge(fdvp);
 1882         }
 1883 
 1884 out:
 1885         if (tdvp == tvp)
 1886                 vrele(tdvp);
 1887         else
 1888                 vput(tdvp);
 1889         if (tvp)
 1890                 vput(tvp);
 1891         vrele(fdvp);
 1892         vrele(fvp);
 1893         /*
 1894          * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 1895          */
 1896         if (error == ENOENT)
 1897                 error = 0;
 1898         return (error);
 1899 }
 1900 
 1901 /*
 1902  * nfs file rename rpc called from nfs_remove() above
 1903  */
 1904 static int
 1905 nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
 1906     struct sillyrename *sp)
 1907 {
 1908 
 1909         return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp,
 1910             sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread));
 1911 }
 1912 
 1913 /*
 1914  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
 1915  */
 1916 static int
 1917 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen,
 1918     struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred,
 1919     struct thread *td)
 1920 {
 1921         caddr_t bpos, dpos;
 1922         int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
 1923         struct mbuf *mreq, *mrep, *md, *mb;
 1924         int v3 = NFS_ISV3(fdvp);
 1925 
 1926         nfsstats.rpccnt[NFSPROC_RENAME]++;
 1927         mreq = m_get2((NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) +
 1928             nfsm_rndup(tnamelen), M_WAITOK, MT_DATA, 0);
 1929         mb = mreq;
 1930         bpos = mtod(mb, caddr_t);
 1931         nfsm_fhtom(fdvp, v3);
 1932         nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
 1933         nfsm_fhtom(tdvp, v3);
 1934         nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
 1935         nfsm_request(fdvp, NFSPROC_RENAME, td, cred);
 1936         if (v3) {
 1937                 nfsm_wcc_data(fdvp, fwccflag);
 1938                 nfsm_wcc_data(tdvp, twccflag);
 1939         }
 1940         m_freem(mrep);
 1941 nfsmout:
 1942         mtx_lock(&(VTONFS(fdvp))->n_mtx);
 1943         VTONFS(fdvp)->n_flag |= NMODIFIED;
 1944         mtx_unlock(&(VTONFS(fdvp))->n_mtx);
 1945         mtx_lock(&(VTONFS(tdvp))->n_mtx);
 1946         VTONFS(tdvp)->n_flag |= NMODIFIED;
 1947         mtx_unlock(&(VTONFS(tdvp))->n_mtx);
 1948         if (!fwccflag) {
 1949                 VTONFS(fdvp)->n_attrstamp = 0;
 1950                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
 1951         }
 1952         if (!twccflag) {
 1953                 VTONFS(tdvp)->n_attrstamp = 0;
 1954                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 1955         }
 1956         return (error);
 1957 }
 1958 
 1959 /*
 1960  * nfs hard link create call
 1961  */
 1962 static int
 1963 nfs_link(struct vop_link_args *ap)
 1964 {
 1965         struct vnode *vp = ap->a_vp;
 1966         struct vnode *tdvp = ap->a_tdvp;
 1967         struct componentname *cnp = ap->a_cnp;
 1968         caddr_t bpos, dpos;
 1969         int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
 1970         struct mbuf *mreq, *mrep, *md, *mb;
 1971         int v3;
 1972 
 1973         if (vp->v_mount != tdvp->v_mount) {
 1974                 return (EXDEV);
 1975         }
 1976 
 1977         /*
 1978          * Push all writes to the server, so that the attribute cache
 1979          * doesn't get "out of sync" with the server.
 1980          * XXX There should be a better way!
 1981          */
 1982         VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
 1983 
 1984         v3 = NFS_ISV3(vp);
 1985         nfsstats.rpccnt[NFSPROC_LINK]++;
 1986         mreq = m_get2(NFSX_FH(v3)*2 + NFSX_UNSIGNED +
 1987             nfsm_rndup(cnp->cn_namelen), M_WAITOK, MT_DATA, 0);
 1988         mb = mreq;
 1989         bpos = mtod(mb, caddr_t);
 1990         nfsm_fhtom(vp, v3);
 1991         nfsm_fhtom(tdvp, v3);
 1992         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 1993         nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred);
 1994         if (v3) {
 1995                 nfsm_postop_attr(vp, attrflag);
 1996                 nfsm_wcc_data(tdvp, wccflag);
 1997         }
 1998         m_freem(mrep);
 1999 nfsmout:
 2000         mtx_lock(&(VTONFS(tdvp))->n_mtx);
 2001         VTONFS(tdvp)->n_flag |= NMODIFIED;
 2002         mtx_unlock(&(VTONFS(tdvp))->n_mtx);
 2003         if (!attrflag) {
 2004                 VTONFS(vp)->n_attrstamp = 0;
 2005                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 2006         }
 2007         if (!wccflag) {
 2008                 VTONFS(tdvp)->n_attrstamp = 0;
 2009                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
 2010         }
 2011         return (error);
 2012 }
 2013 
 2014 /*
 2015  * nfs symbolic link create call
 2016  */
 2017 static int
 2018 nfs_symlink(struct vop_symlink_args *ap)
 2019 {
 2020         struct vnode *dvp = ap->a_dvp;
 2021         struct vattr *vap = ap->a_vap;
 2022         struct componentname *cnp = ap->a_cnp;
 2023         struct nfsv2_sattr *sp;
 2024         caddr_t bpos, dpos;
 2025         int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
 2026         struct mbuf *mreq, *mrep, *md, *mb;
 2027         struct vnode *newvp = NULL;
 2028         int v3 = NFS_ISV3(dvp);
 2029 
 2030         nfsstats.rpccnt[NFSPROC_SYMLINK]++;
 2031         slen = strlen(ap->a_target);
 2032         mreq = m_get2(NFSX_FH(v3) + 2*NFSX_UNSIGNED +
 2033             nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3),
 2034             M_WAITOK, MT_DATA, 0);
 2035         mb = mreq;
 2036         bpos = mtod(mb, caddr_t);
 2037         nfsm_fhtom(dvp, v3);
 2038         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 2039         if (v3) {
 2040                 nfsm_v3attrbuild(vap, FALSE);
 2041         }
 2042         nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN);
 2043         if (!v3) {
 2044                 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
 2045                 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode);
 2046                 sp->sa_uid = nfs_xdrneg1;
 2047                 sp->sa_gid = nfs_xdrneg1;
 2048                 sp->sa_size = nfs_xdrneg1;
 2049                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 2050                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 2051         }
 2052 
 2053         /*
 2054          * Issue the NFS request and get the rpc response.
 2055          *
 2056          * Only NFSv3 responses returning an error of 0 actually return
 2057          * a file handle that can be converted into newvp without having
 2058          * to do an extra lookup rpc.
 2059          */
 2060         nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred);
 2061         if (v3) {
 2062                 if (error == 0)
 2063                         nfsm_mtofh(dvp, newvp, v3, gotvp);
 2064                 nfsm_wcc_data(dvp, wccflag);
 2065         }
 2066 
 2067         /*
 2068          * out code jumps -> here, mrep is also freed.
 2069          */
 2070 
 2071         m_freem(mrep);
 2072 nfsmout:
 2073 
 2074         /*
 2075          * If we do not have an error and we could not extract the newvp from
 2076          * the response due to the request being NFSv2, we have to do a
 2077          * lookup in order to obtain a newvp to return.
 2078          */
 2079         if (error == 0 && newvp == NULL) {
 2080                 struct nfsnode *np = NULL;
 2081 
 2082                 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 2083                     cnp->cn_cred, cnp->cn_thread, &np);
 2084                 if (!error)
 2085                         newvp = NFSTOV(np);
 2086         }
 2087         if (error) {
 2088                 if (newvp)
 2089                         vput(newvp);
 2090         } else {
 2091                 *ap->a_vpp = newvp;
 2092         }
 2093         mtx_lock(&(VTONFS(dvp))->n_mtx);
 2094         VTONFS(dvp)->n_flag |= NMODIFIED;
 2095         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 2096         if (!wccflag) {
 2097                 VTONFS(dvp)->n_attrstamp = 0;
 2098                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2099         }
 2100         return (error);
 2101 }
 2102 
 2103 /*
 2104  * nfs make dir call
 2105  */
 2106 static int
 2107 nfs_mkdir(struct vop_mkdir_args *ap)
 2108 {
 2109         struct vnode *dvp = ap->a_dvp;
 2110         struct vattr *vap = ap->a_vap;
 2111         struct componentname *cnp = ap->a_cnp;
 2112         struct nfsv2_sattr *sp;
 2113         int len;
 2114         struct nfsnode *np = NULL;
 2115         struct vnode *newvp = NULL;
 2116         caddr_t bpos, dpos;
 2117         int error = 0, wccflag = NFSV3_WCCRATTR;
 2118         int gotvp = 0;
 2119         struct mbuf *mreq, *mrep, *md, *mb;
 2120         struct vattr vattr;
 2121         int v3 = NFS_ISV3(dvp);
 2122 
 2123         if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
 2124                 return (error);
 2125         len = cnp->cn_namelen;
 2126         nfsstats.rpccnt[NFSPROC_MKDIR]++;
 2127         mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) +
 2128             NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0);
 2129         mb = mreq;
 2130         bpos = mtod(mb, caddr_t);
 2131         nfsm_fhtom(dvp, v3);
 2132         nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
 2133         if (v3) {
 2134                 nfsm_v3attrbuild(vap, FALSE);
 2135         } else {
 2136                 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
 2137                 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode);
 2138                 sp->sa_uid = nfs_xdrneg1;
 2139                 sp->sa_gid = nfs_xdrneg1;
 2140                 sp->sa_size = nfs_xdrneg1;
 2141                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 2142                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 2143         }
 2144         nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred);
 2145         if (!error)
 2146                 nfsm_mtofh(dvp, newvp, v3, gotvp);
 2147         if (v3)
 2148                 nfsm_wcc_data(dvp, wccflag);
 2149         m_freem(mrep);
 2150 nfsmout:
 2151         mtx_lock(&(VTONFS(dvp))->n_mtx);
 2152         VTONFS(dvp)->n_flag |= NMODIFIED;
 2153         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 2154         if (!wccflag) {
 2155                 VTONFS(dvp)->n_attrstamp = 0;
 2156                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2157         }
 2158         if (error == 0 && newvp == NULL) {
 2159                 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
 2160                         cnp->cn_thread, &np);
 2161                 if (!error) {
 2162                         newvp = NFSTOV(np);
 2163                         if (newvp->v_type != VDIR)
 2164                                 error = EEXIST;
 2165                 }
 2166         }
 2167         if (error) {
 2168                 if (newvp)
 2169                         vput(newvp);
 2170         } else
 2171                 *ap->a_vpp = newvp;
 2172         return (error);
 2173 }
 2174 
 2175 /*
 2176  * nfs remove directory call
 2177  */
 2178 static int
 2179 nfs_rmdir(struct vop_rmdir_args *ap)
 2180 {
 2181         struct vnode *vp = ap->a_vp;
 2182         struct vnode *dvp = ap->a_dvp;
 2183         struct componentname *cnp = ap->a_cnp;
 2184         caddr_t bpos, dpos;
 2185         int error = 0, wccflag = NFSV3_WCCRATTR;
 2186         struct mbuf *mreq, *mrep, *md, *mb;
 2187         int v3 = NFS_ISV3(dvp);
 2188 
 2189         if (dvp == vp)
 2190                 return (EINVAL);
 2191         nfsstats.rpccnt[NFSPROC_RMDIR]++;
 2192         mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED +
 2193             nfsm_rndup(cnp->cn_namelen), M_WAITOK, MT_DATA, 0);
 2194         mb = mreq;
 2195         bpos = mtod(mb, caddr_t);
 2196         nfsm_fhtom(dvp, v3);
 2197         nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 2198         nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred);
 2199         if (v3)
 2200                 nfsm_wcc_data(dvp, wccflag);
 2201         m_freem(mrep);
 2202 nfsmout:
 2203         mtx_lock(&(VTONFS(dvp))->n_mtx);
 2204         VTONFS(dvp)->n_flag |= NMODIFIED;
 2205         mtx_unlock(&(VTONFS(dvp))->n_mtx);
 2206         if (!wccflag) {
 2207                 VTONFS(dvp)->n_attrstamp = 0;
 2208                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 2209         }
 2210         cache_purge(dvp);
 2211         cache_purge(vp);
 2212         /*
 2213          * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 2214          */
 2215         if (error == ENOENT)
 2216                 error = 0;
 2217         return (error);
 2218 }
 2219 
 2220 /*
 2221  * nfs readdir call
 2222  */
 2223 static int
 2224 nfs_readdir(struct vop_readdir_args *ap)
 2225 {
 2226         struct vnode *vp = ap->a_vp;
 2227         struct nfsnode *np = VTONFS(vp);
 2228         struct uio *uio = ap->a_uio;
 2229         int tresid, error = 0;
 2230         struct vattr vattr;
 2231         
 2232         if (vp->v_type != VDIR) 
 2233                 return(EPERM);
 2234 
 2235         /*
 2236          * First, check for hit on the EOF offset cache
 2237          */
 2238         if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
 2239             (np->n_flag & NMODIFIED) == 0) {
 2240                 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
 2241                         mtx_lock(&np->n_mtx);
 2242                         if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
 2243                                 mtx_unlock(&np->n_mtx);
 2244                                 nfsstats.direofcache_hits++;
 2245                                 goto out;
 2246                         } else
 2247                                 mtx_unlock(&np->n_mtx);
 2248                 }
 2249         }
 2250 
 2251         /*
 2252          * Call nfs_bioread() to do the real work.
 2253          */
 2254         tresid = uio->uio_resid;
 2255         error = nfs_bioread(vp, uio, 0, ap->a_cred);
 2256 
 2257         if (!error && uio->uio_resid == tresid) {
 2258                 nfsstats.direofcache_misses++;
 2259         }
 2260 out:
 2261         return (error);
 2262 }
 2263 
 2264 /*
 2265  * Readdir rpc call.
 2266  * Called from below the buffer cache by nfs_doio().
 2267  */
 2268 int
 2269 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 2270 {
 2271         int len, left;
 2272         struct dirent *dp = NULL;
 2273         u_int32_t *tl;
 2274         caddr_t cp;
 2275         nfsuint64 *cookiep;
 2276         caddr_t bpos, dpos;
 2277         struct mbuf *mreq, *mrep, *md, *mb;
 2278         nfsuint64 cookie;
 2279         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2280         struct nfsnode *dnp = VTONFS(vp);
 2281         u_quad_t fileno;
 2282         int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1;
 2283         int attrflag;
 2284         int v3 = NFS_ISV3(vp);
 2285 
 2286         KASSERT(uiop->uio_iovcnt == 1 &&
 2287             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2288             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2289             ("nfs readdirrpc bad uio"));
 2290 
 2291         /*
 2292          * If there is no cookie, assume directory was stale.
 2293          */
 2294         nfs_dircookie_lock(dnp);
 2295         cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
 2296         if (cookiep) {
 2297                 cookie = *cookiep;
 2298                 nfs_dircookie_unlock(dnp);
 2299         } else {
 2300                 nfs_dircookie_unlock(dnp);              
 2301                 return (NFSERR_BAD_COOKIE);
 2302         }
 2303 
 2304         /*
 2305          * Loop around doing readdir rpc's of size nm_readdirsize
 2306          * truncated to a multiple of DIRBLKSIZ.
 2307          * The stopping criteria is EOF or buffer full.
 2308          */
 2309         while (more_dirs && bigenough) {
 2310                 nfsstats.rpccnt[NFSPROC_READDIR]++;
 2311                 mreq = m_get2(NFSX_FH(v3) + NFSX_READDIR(v3), M_WAITOK,
 2312                     MT_DATA, 0);
 2313                 mb = mreq;
 2314                 bpos = mtod(mb, caddr_t);
 2315                 nfsm_fhtom(vp, v3);
 2316                 if (v3) {
 2317                         tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
 2318                         *tl++ = cookie.nfsuquad[0];
 2319                         *tl++ = cookie.nfsuquad[1];
 2320                         mtx_lock(&dnp->n_mtx);
 2321                         *tl++ = dnp->n_cookieverf.nfsuquad[0];
 2322                         *tl++ = dnp->n_cookieverf.nfsuquad[1];
 2323                         mtx_unlock(&dnp->n_mtx);
 2324                 } else {
 2325                         tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
 2326                         *tl++ = cookie.nfsuquad[0];
 2327                 }
 2328                 *tl = txdr_unsigned(nmp->nm_readdirsize);
 2329                 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred);
 2330                 if (v3) {
 2331                         nfsm_postop_attr(vp, attrflag);
 2332                         if (!error) {
 2333                                 tl = nfsm_dissect(u_int32_t *,
 2334                                     2 * NFSX_UNSIGNED);
 2335                                 mtx_lock(&dnp->n_mtx);
 2336                                 dnp->n_cookieverf.nfsuquad[0] = *tl++;
 2337                                 dnp->n_cookieverf.nfsuquad[1] = *tl;
 2338                                 mtx_unlock(&dnp->n_mtx);
 2339                         } else {
 2340                                 m_freem(mrep);
 2341                                 goto nfsmout;
 2342                         }
 2343                 }
 2344                 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2345                 more_dirs = fxdr_unsigned(int, *tl);
 2346 
 2347                 /* loop thru the dir entries, doctoring them to 4bsd form */
 2348                 while (more_dirs && bigenough) {
 2349                         if (v3) {
 2350                                 tl = nfsm_dissect(u_int32_t *,
 2351                                     3 * NFSX_UNSIGNED);
 2352                                 fileno = fxdr_hyper(tl);
 2353                                 len = fxdr_unsigned(int, *(tl + 2));
 2354                         } else {
 2355                                 tl = nfsm_dissect(u_int32_t *,
 2356                                     2 * NFSX_UNSIGNED);
 2357                                 fileno = fxdr_unsigned(u_quad_t, *tl++);
 2358                                 len = fxdr_unsigned(int, *tl);
 2359                         }
 2360                         if (len <= 0 || len > NFS_MAXNAMLEN) {
 2361                                 error = EBADRPC;
 2362                                 m_freem(mrep);
 2363                                 goto nfsmout;
 2364                         }
 2365                         tlen = nfsm_rndup(len);
 2366                         if (tlen == len)
 2367                                 tlen += 4;      /* To ensure null termination */
 2368                         left = DIRBLKSIZ - blksiz;
 2369                         if ((tlen + DIRHDSIZ) > left) {
 2370                                 dp->d_reclen += left;
 2371                                 uiop->uio_iov->iov_base =
 2372                                     (char *)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 =
 2392                                     (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
 2393                                 uiop->uio_iov->iov_len -= DIRHDSIZ;
 2394                                 nfsm_mtouio(uiop, len);
 2395                                 cp = uiop->uio_iov->iov_base;
 2396                                 tlen -= len;
 2397                                 *cp = '\0';     /* null terminate */
 2398                                 uiop->uio_iov->iov_base =
 2399                                     (char *)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                         if (v3) {
 2406                                 tl = nfsm_dissect(u_int32_t *,
 2407                                     3 * NFSX_UNSIGNED);
 2408                         } else {
 2409                                 tl = nfsm_dissect(u_int32_t *,
 2410                                     2 * NFSX_UNSIGNED);
 2411                         }
 2412                         if (bigenough) {
 2413                                 cookie.nfsuquad[0] = *tl++;
 2414                                 if (v3)
 2415                                         cookie.nfsuquad[1] = *tl++;
 2416                         } else if (v3)
 2417                                 tl += 2;
 2418                         else
 2419                                 tl++;
 2420                         more_dirs = fxdr_unsigned(int, *tl);
 2421                 }
 2422                 /*
 2423                  * If at end of rpc data, get the eof boolean
 2424                  */
 2425                 if (!more_dirs) {
 2426                         tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2427                         more_dirs = (fxdr_unsigned(int, *tl) == 0);
 2428                 }
 2429                 m_freem(mrep);
 2430         }
 2431         /*
 2432          * Fill last record, iff any, out to a multiple of DIRBLKSIZ
 2433          * by increasing d_reclen for the last record.
 2434          */
 2435         if (blksiz > 0) {
 2436                 left = DIRBLKSIZ - blksiz;
 2437                 dp->d_reclen += left;
 2438                 uiop->uio_iov->iov_base =
 2439                     (char *)uiop->uio_iov->iov_base + left;
 2440                 uiop->uio_iov->iov_len -= left;
 2441                 uiop->uio_offset += left;
 2442                 uiop->uio_resid -= left;
 2443         }
 2444 
 2445         /*
 2446          * We are now either at the end of the directory or have filled the
 2447          * block.
 2448          */
 2449         if (bigenough)
 2450                 dnp->n_direofoffset = uiop->uio_offset;
 2451         else {
 2452                 if (uiop->uio_resid > 0)
 2453                         nfs_printf("EEK! readdirrpc resid > 0\n");
 2454                 nfs_dircookie_lock(dnp);
 2455                 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
 2456                 *cookiep = cookie;
 2457                 nfs_dircookie_unlock(dnp);
 2458         }
 2459 nfsmout:
 2460         return (error);
 2461 }
 2462 
 2463 /*
 2464  * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc().
 2465  */
 2466 int
 2467 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
 2468 {
 2469         int len, left;
 2470         struct dirent *dp;
 2471         u_int32_t *tl;
 2472         caddr_t cp;
 2473         struct vnode *newvp;
 2474         nfsuint64 *cookiep;
 2475         caddr_t bpos, dpos, dpossav1, dpossav2;
 2476         struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2;
 2477         struct nameidata nami, *ndp = &nami;
 2478         struct componentname *cnp = &ndp->ni_cnd;
 2479         nfsuint64 cookie;
 2480         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2481         struct nfsnode *dnp = VTONFS(vp), *np;
 2482         struct vattr vattr, dvattr;
 2483         nfsfh_t *fhp;
 2484         u_quad_t fileno;
 2485         int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i;
 2486         int attrflag, dattrflag, fhsize;
 2487 
 2488 #ifndef nolint
 2489         dp = NULL;
 2490 #endif
 2491         KASSERT(uiop->uio_iovcnt == 1 &&
 2492             (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
 2493             (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
 2494             ("nfs readdirplusrpc bad uio"));
 2495         ndp->ni_dvp = vp;
 2496         newvp = NULLVP;
 2497 
 2498         /*
 2499          * If there is no cookie, assume directory was stale.
 2500          */
 2501         nfs_dircookie_lock(dnp);
 2502         cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
 2503         if (cookiep) {
 2504                 cookie = *cookiep;
 2505                 nfs_dircookie_unlock(dnp);
 2506         } else {
 2507                 nfs_dircookie_unlock(dnp);
 2508                 return (NFSERR_BAD_COOKIE);
 2509         }
 2510         /*
 2511          * Loop around doing readdir rpc's of size nm_readdirsize
 2512          * truncated to a multiple of DIRBLKSIZ.
 2513          * The stopping criteria is EOF or buffer full.
 2514          */
 2515         while (more_dirs && bigenough) {
 2516                 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
 2517                 mreq = m_get2(NFSX_FH(1) + 6 * NFSX_UNSIGNED, M_WAITOK,
 2518                     MT_DATA, 0);
 2519                 mb = mreq;
 2520                 bpos = mtod(mb, caddr_t);
 2521                 nfsm_fhtom(vp, 1);
 2522                 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED);
 2523                 *tl++ = cookie.nfsuquad[0];
 2524                 *tl++ = cookie.nfsuquad[1];
 2525                 mtx_lock(&dnp->n_mtx);
 2526                 *tl++ = dnp->n_cookieverf.nfsuquad[0];
 2527                 *tl++ = dnp->n_cookieverf.nfsuquad[1];
 2528                 mtx_unlock(&dnp->n_mtx);
 2529                 *tl++ = txdr_unsigned(nmp->nm_readdirsize);
 2530                 *tl = txdr_unsigned(nmp->nm_rsize);
 2531                 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred);
 2532                 nfsm_postop_attr_va(vp, dattrflag, &dvattr);
 2533                 if (error) {
 2534                         m_freem(mrep);
 2535                         goto nfsmout;
 2536                 }
 2537                 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
 2538                 mtx_lock(&dnp->n_mtx);
 2539                 dnp->n_cookieverf.nfsuquad[0] = *tl++;
 2540                 dnp->n_cookieverf.nfsuquad[1] = *tl++;
 2541                 mtx_unlock(&dnp->n_mtx);
 2542                 more_dirs = fxdr_unsigned(int, *tl);
 2543 
 2544                 /* loop thru the dir entries, doctoring them to 4bsd form */
 2545                 while (more_dirs && bigenough) {
 2546                         tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
 2547                         fileno = fxdr_hyper(tl);
 2548                         len = fxdr_unsigned(int, *(tl + 2));
 2549                         if (len <= 0 || len > NFS_MAXNAMLEN) {
 2550                                 error = EBADRPC;
 2551                                 m_freem(mrep);
 2552                                 goto nfsmout;
 2553                         }
 2554                         tlen = nfsm_rndup(len);
 2555                         if (tlen == len)
 2556                                 tlen += 4;      /* To ensure null termination*/
 2557                         left = DIRBLKSIZ - blksiz;
 2558                         if ((tlen + DIRHDSIZ) > left) {
 2559                                 dp->d_reclen += left;
 2560                                 uiop->uio_iov->iov_base =
 2561                                     (char *)uiop->uio_iov->iov_base + left;
 2562                                 uiop->uio_iov->iov_len -= left;
 2563                                 uiop->uio_offset += left;
 2564                                 uiop->uio_resid -= left;
 2565                                 blksiz = 0;
 2566                         }
 2567                         if ((tlen + DIRHDSIZ) > uiop->uio_resid)
 2568                                 bigenough = 0;
 2569                         if (bigenough) {
 2570                                 dp = (struct dirent *)uiop->uio_iov->iov_base;
 2571                                 dp->d_fileno = (int)fileno;
 2572                                 dp->d_namlen = len;
 2573                                 dp->d_reclen = tlen + DIRHDSIZ;
 2574                                 dp->d_type = DT_UNKNOWN;
 2575                                 blksiz += dp->d_reclen;
 2576                                 if (blksiz == DIRBLKSIZ)
 2577                                         blksiz = 0;
 2578                                 uiop->uio_offset += DIRHDSIZ;
 2579                                 uiop->uio_resid -= DIRHDSIZ;
 2580                                 uiop->uio_iov->iov_base =
 2581                                     (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
 2582                                 uiop->uio_iov->iov_len -= DIRHDSIZ;
 2583                                 cnp->cn_nameptr = uiop->uio_iov->iov_base;
 2584                                 cnp->cn_namelen = len;
 2585                                 nfsm_mtouio(uiop, len);
 2586                                 cp = uiop->uio_iov->iov_base;
 2587                                 tlen -= len;
 2588                                 *cp = '\0';
 2589                                 uiop->uio_iov->iov_base =
 2590                                     (char *)uiop->uio_iov->iov_base + tlen;
 2591                                 uiop->uio_iov->iov_len -= tlen;
 2592                                 uiop->uio_offset += tlen;
 2593                                 uiop->uio_resid -= tlen;
 2594                         } else
 2595                                 nfsm_adv(nfsm_rndup(len));
 2596                         tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
 2597                         if (bigenough) {
 2598                                 cookie.nfsuquad[0] = *tl++;
 2599                                 cookie.nfsuquad[1] = *tl++;
 2600                         } else
 2601                                 tl += 2;
 2602 
 2603                         /*
 2604                          * Since the attributes are before the file handle
 2605                          * (sigh), we must skip over the attributes and then
 2606                          * come back and get them.
 2607                          */
 2608                         attrflag = fxdr_unsigned(int, *tl);
 2609                         if (attrflag) {
 2610                             dpossav1 = dpos;
 2611                             mdsav1 = md;
 2612                             nfsm_adv(NFSX_V3FATTR);
 2613                             tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2614                             doit = fxdr_unsigned(int, *tl);
 2615                             /*
 2616                              * Skip loading the attrs for "..". There's a 
 2617                              * race between loading the attrs here and 
 2618                              * lookups that look for the directory currently
 2619                              * being read (in the parent). We try to acquire
 2620                              * the exclusive lock on ".." here, owning the 
 2621                              * lock on the directory being read. Lookup will
 2622                              * hold the lock on ".." and try to acquire the 
 2623                              * lock on the directory being read.
 2624                              * 
 2625                              * There are other ways of fixing this, one would
 2626                              * be to do a trylock on the ".." vnode and skip
 2627                              * loading the attrs on ".." if it happens to be 
 2628                              * locked by another process. But skipping the
 2629                              * attrload on ".." seems the easiest option.
 2630                              */
 2631                             if (strcmp(dp->d_name, "..") == 0) {
 2632                                     doit = 0;
 2633                                     /*
 2634                                      * We've already skipped over the attrs, 
 2635                                      * skip over the filehandle. And store d_type
 2636                                      * as VDIR.
 2637                                      */
 2638                                     tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2639                                     i = fxdr_unsigned(int, *tl);
 2640                                     nfsm_adv(nfsm_rndup(i));
 2641                                     dp->d_type = IFTODT(VTTOIF(VDIR));
 2642                             }       
 2643                             if (doit) {
 2644                                 nfsm_getfh(fhp, fhsize, 1);
 2645                                 if (NFS_CMPFH(dnp, fhp, fhsize)) {
 2646                                     VREF(vp);
 2647                                     newvp = vp;
 2648                                     np = dnp;
 2649                                 } else {
 2650                                     error = nfs_nget(vp->v_mount, fhp,
 2651                                         fhsize, &np, LK_EXCLUSIVE);
 2652                                     if (error)
 2653                                         doit = 0;
 2654                                     else
 2655                                         newvp = NFSTOV(np);
 2656                                 }
 2657                             }
 2658                             if (doit && bigenough) {
 2659                                 dpossav2 = dpos;
 2660                                 dpos = dpossav1;
 2661                                 mdsav2 = md;
 2662                                 md = mdsav1;
 2663                                 nfsm_loadattr(newvp, &vattr);
 2664                                 dpos = dpossav2;
 2665                                 md = mdsav2;
 2666                                 dp->d_type = IFTODT(VTTOIF(vattr.va_type));
 2667                                 ndp->ni_vp = newvp;
 2668                                 if (newvp->v_type != VDIR || dattrflag != 0)
 2669                                     cache_enter_time(ndp->ni_dvp, ndp->ni_vp,
 2670                                         cnp, &vattr.va_ctime,
 2671                                         newvp->v_type != VDIR ? NULL :
 2672                                         &dvattr.va_ctime);
 2673                             }
 2674                         } else {
 2675                             /* Just skip over the file handle */
 2676                             tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2677                             i = fxdr_unsigned(int, *tl);
 2678                             if (i) {
 2679                                     tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2680                                     fhsize = fxdr_unsigned(int, *tl);
 2681                                     nfsm_adv(nfsm_rndup(fhsize));
 2682                             }
 2683                         }
 2684                         if (newvp != NULLVP) {
 2685                             if (newvp == vp)
 2686                                 vrele(newvp);
 2687                             else
 2688                                 vput(newvp);
 2689                             newvp = NULLVP;
 2690                         }
 2691                         tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2692                         more_dirs = fxdr_unsigned(int, *tl);
 2693                 }
 2694                 /*
 2695                  * If at end of rpc data, get the eof boolean
 2696                  */
 2697                 if (!more_dirs) {
 2698                         tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
 2699                         more_dirs = (fxdr_unsigned(int, *tl) == 0);
 2700                 }
 2701                 m_freem(mrep);
 2702         }
 2703         /*
 2704          * Fill last record, iff any, out to a multiple of DIRBLKSIZ
 2705          * by increasing d_reclen for the last record.
 2706          */
 2707         if (blksiz > 0) {
 2708                 left = DIRBLKSIZ - blksiz;
 2709                 dp->d_reclen += left;
 2710                 uiop->uio_iov->iov_base =
 2711                     (char *)uiop->uio_iov->iov_base + left;
 2712                 uiop->uio_iov->iov_len -= left;
 2713                 uiop->uio_offset += left;
 2714                 uiop->uio_resid -= left;
 2715         }
 2716 
 2717         /*
 2718          * We are now either at the end of the directory or have filled the
 2719          * block.
 2720          */
 2721         if (bigenough)
 2722                 dnp->n_direofoffset = uiop->uio_offset;
 2723         else {
 2724                 if (uiop->uio_resid > 0)
 2725                         nfs_printf("EEK! readdirplusrpc resid > 0\n");
 2726                 nfs_dircookie_lock(dnp);
 2727                 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
 2728                 *cookiep = cookie;
 2729                 nfs_dircookie_unlock(dnp);
 2730         }
 2731 nfsmout:
 2732         if (newvp != NULLVP) {
 2733                 if (newvp == vp)
 2734                         vrele(newvp);
 2735                 else
 2736                         vput(newvp);
 2737                 newvp = NULLVP;
 2738         }
 2739         return (error);
 2740 }
 2741 
 2742 /*
 2743  * Silly rename. To make the NFS filesystem that is stateless look a little
 2744  * more like the "ufs" a remove of an active vnode is translated to a rename
 2745  * to a funny looking filename that is removed by nfs_inactive on the
 2746  * nfsnode. There is the potential for another process on a different client
 2747  * to create the same funny name between the nfs_lookitup() fails and the
 2748  * nfs_rename() completes, but...
 2749  */
 2750 static int
 2751 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
 2752 {
 2753         struct sillyrename *sp;
 2754         struct nfsnode *np;
 2755         int error;
 2756         short pid;
 2757         unsigned int lticks;
 2758 
 2759         cache_purge(dvp);
 2760         np = VTONFS(vp);
 2761         KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
 2762         sp = malloc(sizeof (struct sillyrename),
 2763                 M_NFSREQ, M_WAITOK);
 2764         sp->s_cred = crhold(cnp->cn_cred);
 2765         sp->s_dvp = dvp;
 2766         sp->s_removeit = nfs_removeit;
 2767         VREF(dvp);
 2768 
 2769         /* 
 2770          * Fudge together a funny name.
 2771          * Changing the format of the funny name to accomodate more 
 2772          * sillynames per directory.
 2773          * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 
 2774          * CPU ticks since boot.
 2775          */
 2776         pid = cnp->cn_thread->td_proc->p_pid;
 2777         lticks = (unsigned int)ticks;
 2778         for ( ; ; ) {
 2779                 sp->s_namlen = sprintf(sp->s_name, 
 2780                                        ".nfs.%08x.%04x4.4", lticks, 
 2781                                        pid);
 2782                 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2783                                  cnp->cn_thread, NULL))
 2784                         break;
 2785                 lticks++;
 2786         }
 2787         error = nfs_renameit(dvp, cnp, sp);
 2788         if (error)
 2789                 goto bad;
 2790         error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 2791                 cnp->cn_thread, &np);
 2792         np->n_sillyrename = sp;
 2793         return (0);
 2794 bad:
 2795         vrele(sp->s_dvp);
 2796         crfree(sp->s_cred);
 2797         free((caddr_t)sp, M_NFSREQ);
 2798         return (error);
 2799 }
 2800 
 2801 /*
 2802  * Look up a file name and optionally either update the file handle or
 2803  * allocate an nfsnode, depending on the value of npp.
 2804  * npp == NULL  --> just do the lookup
 2805  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
 2806  *                      handled too
 2807  * *npp != NULL --> update the file handle in the vnode
 2808  */
 2809 static int
 2810 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred,
 2811     struct thread *td, struct nfsnode **npp)
 2812 {
 2813         struct vnode *newvp = NULL;
 2814         struct nfsnode *np, *dnp = VTONFS(dvp);
 2815         caddr_t bpos, dpos;
 2816         int error = 0, fhlen, attrflag;
 2817         struct mbuf *mreq, *mrep, *md, *mb;
 2818         nfsfh_t *nfhp;
 2819         int v3 = NFS_ISV3(dvp);
 2820 
 2821         nfsstats.rpccnt[NFSPROC_LOOKUP]++;
 2822         mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len),
 2823             M_WAITOK, MT_DATA, 0);
 2824         mb = mreq;
 2825         bpos = mtod(mb, caddr_t);
 2826         nfsm_fhtom(dvp, v3);
 2827         nfsm_strtom(name, len, NFS_MAXNAMLEN);
 2828         nfsm_request(dvp, NFSPROC_LOOKUP, td, cred);
 2829         if (npp && !error) {
 2830                 nfsm_getfh(nfhp, fhlen, v3);
 2831                 if (*npp) {
 2832                     np = *npp;
 2833                     if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) {
 2834                         free((caddr_t)np->n_fhp, M_NFSBIGFH);
 2835                         np->n_fhp = &np->n_fh;
 2836                     } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH)
 2837                         np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK);
 2838                     bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen);
 2839                     np->n_fhsize = fhlen;
 2840                     newvp = NFSTOV(np);
 2841                 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
 2842                     VREF(dvp);
 2843                     newvp = dvp;
 2844                 } else {
 2845                     error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE);
 2846                     if (error) {
 2847                         m_freem(mrep);
 2848                         return (error);
 2849                     }
 2850                     newvp = NFSTOV(np);
 2851                 }
 2852                 if (v3) {
 2853                         nfsm_postop_attr(newvp, attrflag);
 2854                         if (!attrflag && *npp == NULL) {
 2855                                 m_freem(mrep);
 2856                                 if (newvp == dvp)
 2857                                         vrele(newvp);
 2858                                 else
 2859                                         vput(newvp);
 2860                                 return (ENOENT);
 2861                         }
 2862                 } else
 2863                         nfsm_loadattr(newvp, NULL);
 2864         }
 2865         m_freem(mrep);
 2866 nfsmout:
 2867         if (npp && *npp == NULL) {
 2868                 if (error) {
 2869                         if (newvp) {
 2870                                 if (newvp == dvp)
 2871                                         vrele(newvp);
 2872                                 else
 2873                                         vput(newvp);
 2874                         }
 2875                 } else
 2876                         *npp = np;
 2877         }
 2878         return (error);
 2879 }
 2880 
 2881 /*
 2882  * Nfs Version 3 commit rpc
 2883  */
 2884 int
 2885 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
 2886            struct thread *td)
 2887 {
 2888         u_int32_t *tl;
 2889         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2890         caddr_t bpos, dpos;
 2891         int error = 0, wccflag = NFSV3_WCCRATTR;
 2892         struct mbuf *mreq, *mrep, *md, *mb;
 2893 
 2894         mtx_lock(&nmp->nm_mtx);
 2895         if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
 2896                 mtx_unlock(&nmp->nm_mtx);
 2897                 return (0);
 2898         }
 2899         mtx_unlock(&nmp->nm_mtx);
 2900         nfsstats.rpccnt[NFSPROC_COMMIT]++;
 2901         mreq = m_get2(NFSX_FH(1), M_WAITOK, MT_DATA, 0);
 2902         mb = mreq;
 2903         bpos = mtod(mb, caddr_t);
 2904         nfsm_fhtom(vp, 1);
 2905         tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED);
 2906         txdr_hyper(offset, tl);
 2907         tl += 2;
 2908         *tl = txdr_unsigned(cnt);
 2909         nfsm_request(vp, NFSPROC_COMMIT, td, cred);
 2910         nfsm_wcc_data(vp, wccflag);
 2911         if (!error) {
 2912                 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF);
 2913                 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl,
 2914                         NFSX_V3WRITEVERF)) {
 2915                         bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
 2916                                 NFSX_V3WRITEVERF);
 2917                         error = NFSERR_STALEWRITEVERF;
 2918                 }
 2919         }
 2920         m_freem(mrep);
 2921 nfsmout:
 2922         return (error);
 2923 }
 2924 
 2925 /*
 2926  * Strategy routine.
 2927  * For async requests when nfsiod(s) are running, queue the request by
 2928  * calling nfs_asyncio(), otherwise just all nfs_doio() to do the
 2929  * request.
 2930  */
 2931 static int
 2932 nfs_strategy(struct vop_strategy_args *ap)
 2933 {
 2934         struct buf *bp = ap->a_bp;
 2935         struct ucred *cr;
 2936 
 2937         KASSERT(!(bp->b_flags & B_DONE),
 2938             ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
 2939         BUF_ASSERT_HELD(bp);
 2940 
 2941         if (bp->b_iocmd == BIO_READ)
 2942                 cr = bp->b_rcred;
 2943         else
 2944                 cr = bp->b_wcred;
 2945 
 2946         /*
 2947          * If the op is asynchronous and an i/o daemon is waiting
 2948          * queue the request, wake it up and wait for completion
 2949          * otherwise just do it ourselves.
 2950          */
 2951         if ((bp->b_flags & B_ASYNC) == 0 ||
 2952             nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
 2953                 (void)nfs_doio(ap->a_vp, bp, cr, curthread);
 2954         return (0);
 2955 }
 2956 
 2957 /*
 2958  * fsync vnode op. Just call nfs_flush() with commit == 1.
 2959  */
 2960 /* ARGSUSED */
 2961 static int
 2962 nfs_fsync(struct vop_fsync_args *ap)
 2963 {
 2964 
 2965         return (nfs_flush(ap->a_vp, ap->a_waitfor, 1));
 2966 }
 2967 
 2968 /*
 2969  * Flush all the blocks associated with a vnode.
 2970  *      Walk through the buffer pool and push any dirty pages
 2971  *      associated with the vnode.
 2972  */
 2973 static int
 2974 nfs_flush(struct vnode *vp, int waitfor, int commit)
 2975 {
 2976         struct nfsnode *np = VTONFS(vp);
 2977         struct buf *bp;
 2978         int i;
 2979         struct buf *nbp;
 2980         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 2981         int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
 2982         int passone = 1;
 2983         u_quad_t off, endoff, toff;
 2984         struct ucred* wcred = NULL;
 2985         struct buf **bvec = NULL;
 2986         struct bufobj *bo;
 2987         struct thread *td = curthread;
 2988 #ifndef NFS_COMMITBVECSIZ
 2989 #define NFS_COMMITBVECSIZ       20
 2990 #endif
 2991         struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
 2992         int bvecsize = 0, bveccount;
 2993 
 2994         if (nmp->nm_flag & NFSMNT_INT)
 2995                 slpflag = PCATCH;
 2996         if (!commit)
 2997                 passone = 0;
 2998         bo = &vp->v_bufobj;
 2999         /*
 3000          * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
 3001          * server, but has not been committed to stable storage on the server
 3002          * yet. On the first pass, the byte range is worked out and the commit
 3003          * rpc is done. On the second pass, nfs_writebp() is called to do the
 3004          * job.
 3005          */
 3006 again:
 3007         off = (u_quad_t)-1;
 3008         endoff = 0;
 3009         bvecpos = 0;
 3010         if (NFS_ISV3(vp) && commit) {
 3011                 if (bvec != NULL && bvec != bvec_on_stack)
 3012                         free(bvec, M_TEMP);
 3013                 /*
 3014                  * Count up how many buffers waiting for a commit.
 3015                  */
 3016                 bveccount = 0;
 3017                 BO_LOCK(bo);
 3018                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 3019                         if (!BUF_ISLOCKED(bp) &&
 3020                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
 3021                                 == (B_DELWRI | B_NEEDCOMMIT))
 3022                                 bveccount++;
 3023                 }
 3024                 /*
 3025                  * Allocate space to remember the list of bufs to commit.  It is
 3026                  * important to use M_NOWAIT here to avoid a race with nfs_write.
 3027                  * If we can't get memory (for whatever reason), we will end up
 3028                  * committing the buffers one-by-one in the loop below.
 3029                  */
 3030                 if (bveccount > NFS_COMMITBVECSIZ) {
 3031                         /*
 3032                          * Release the vnode interlock to avoid a lock
 3033                          * order reversal.
 3034                          */
 3035                         BO_UNLOCK(bo);
 3036                         bvec = (struct buf **)
 3037                                 malloc(bveccount * sizeof(struct buf *),
 3038                                        M_TEMP, M_NOWAIT);
 3039                         BO_LOCK(bo);
 3040                         if (bvec == NULL) {
 3041                                 bvec = bvec_on_stack;
 3042                                 bvecsize = NFS_COMMITBVECSIZ;
 3043                         } else
 3044                                 bvecsize = bveccount;
 3045                 } else {
 3046                         bvec = bvec_on_stack;
 3047                         bvecsize = NFS_COMMITBVECSIZ;
 3048                 }
 3049                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 3050                         if (bvecpos >= bvecsize)
 3051                                 break;
 3052                         if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 3053                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 3054                                 continue;
 3055                         }
 3056                         if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
 3057                             (B_DELWRI | B_NEEDCOMMIT)) {
 3058                                 BUF_UNLOCK(bp);
 3059                                 nbp = TAILQ_NEXT(bp, b_bobufs);
 3060                                 continue;
 3061                         }
 3062                         BO_UNLOCK(bo);
 3063                         bremfree(bp);
 3064                         /*
 3065                          * Work out if all buffers are using the same cred
 3066                          * so we can deal with them all with one commit.
 3067                          *
 3068                          * NOTE: we are not clearing B_DONE here, so we have
 3069                          * to do it later on in this routine if we intend to
 3070                          * initiate I/O on the bp.
 3071                          *
 3072                          * Note: to avoid loopback deadlocks, we do not
 3073                          * assign b_runningbufspace.
 3074                          */
 3075                         if (wcred == NULL)
 3076                                 wcred = bp->b_wcred;
 3077                         else if (wcred != bp->b_wcred)
 3078                                 wcred = NOCRED;
 3079                         vfs_busy_pages(bp, 1);
 3080 
 3081                         BO_LOCK(bo);
 3082                         /*
 3083                          * bp is protected by being locked, but nbp is not
 3084                          * and vfs_busy_pages() may sleep.  We have to
 3085                          * recalculate nbp.
 3086                          */
 3087                         nbp = TAILQ_NEXT(bp, b_bobufs);
 3088 
 3089                         /*
 3090                          * A list of these buffers is kept so that the
 3091                          * second loop knows which buffers have actually
 3092                          * been committed. This is necessary, since there
 3093                          * may be a race between the commit rpc and new
 3094                          * uncommitted writes on the file.
 3095                          */
 3096                         bvec[bvecpos++] = bp;
 3097                         toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 3098                                 bp->b_dirtyoff;
 3099                         if (toff < off)
 3100                                 off = toff;
 3101                         toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
 3102                         if (toff > endoff)
 3103                                 endoff = toff;
 3104                 }
 3105                 BO_UNLOCK(bo);
 3106         }
 3107         if (bvecpos > 0) {
 3108                 /*
 3109                  * Commit data on the server, as required.
 3110                  * If all bufs are using the same wcred, then use that with
 3111                  * one call for all of them, otherwise commit each one
 3112                  * separately.
 3113                  */
 3114                 if (wcred != NOCRED)
 3115                         retv = nfs_commit(vp, off, (int)(endoff - off),
 3116                                           wcred, td);
 3117                 else {
 3118                         retv = 0;
 3119                         for (i = 0; i < bvecpos; i++) {
 3120                                 off_t off, size;
 3121                                 bp = bvec[i];
 3122                                 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
 3123                                         bp->b_dirtyoff;
 3124                                 size = (u_quad_t)(bp->b_dirtyend
 3125                                                   - bp->b_dirtyoff);
 3126                                 retv = nfs_commit(vp, off, (int)size,
 3127                                                   bp->b_wcred, td);
 3128                                 if (retv) break;
 3129                         }
 3130                 }
 3131 
 3132                 if (retv == NFSERR_STALEWRITEVERF)
 3133                         nfs_clearcommit(vp->v_mount);
 3134 
 3135                 /*
 3136                  * Now, either mark the blocks I/O done or mark the
 3137                  * blocks dirty, depending on whether the commit
 3138                  * succeeded.
 3139                  */
 3140                 for (i = 0; i < bvecpos; i++) {
 3141                         bp = bvec[i];
 3142                         bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
 3143                         if (retv) {
 3144                                 /*
 3145                                  * Error, leave B_DELWRI intact
 3146                                  */
 3147                                 vfs_unbusy_pages(bp);
 3148                                 brelse(bp);
 3149                         } else {
 3150                                 /*
 3151                                  * Success, remove B_DELWRI ( bundirty() ).
 3152                                  *
 3153                                  * b_dirtyoff/b_dirtyend seem to be NFS
 3154                                  * specific.  We should probably move that
 3155                                  * into bundirty(). XXX
 3156                                  */
 3157                                 bufobj_wref(bo);
 3158                                 bp->b_flags |= B_ASYNC;
 3159                                 bundirty(bp);
 3160                                 bp->b_flags &= ~B_DONE;
 3161                                 bp->b_ioflags &= ~BIO_ERROR;
 3162                                 bp->b_dirtyoff = bp->b_dirtyend = 0;
 3163                                 bufdone(bp);
 3164                         }
 3165                 }
 3166         }
 3167 
 3168         /*
 3169          * Start/do any write(s) that are required.
 3170          */
 3171 loop:
 3172         BO_LOCK(bo);
 3173         TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 3174                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
 3175                         if (waitfor != MNT_WAIT || passone)
 3176                                 continue;
 3177 
 3178                         error = BUF_TIMELOCK(bp,
 3179                             LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
 3180                             BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
 3181                         if (error == 0) {
 3182                                 BUF_UNLOCK(bp);
 3183                                 goto loop;
 3184                         }
 3185                         if (error == ENOLCK) {
 3186                                 error = 0;
 3187                                 goto loop;
 3188                         }
 3189                         if (nfs_sigintr(nmp, td)) {
 3190                                 error = EINTR;
 3191                                 goto done;
 3192                         }
 3193                         if (slpflag == PCATCH) {
 3194                                 slpflag = 0;
 3195                                 slptimeo = 2 * hz;
 3196                         }
 3197                         goto loop;
 3198                 }
 3199                 if ((bp->b_flags & B_DELWRI) == 0)
 3200                         panic("nfs_fsync: not dirty");
 3201                 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
 3202                         BUF_UNLOCK(bp);
 3203                         continue;
 3204                 }
 3205                 BO_UNLOCK(bo);
 3206                 bremfree(bp);
 3207                 if (passone || !commit)
 3208                     bp->b_flags |= B_ASYNC;
 3209                 else
 3210                     bp->b_flags |= B_ASYNC;
 3211                 bwrite(bp);
 3212                 if (nfs_sigintr(nmp, td)) {
 3213                         error = EINTR;
 3214                         goto done;
 3215                 }
 3216                 goto loop;
 3217         }
 3218         if (passone) {
 3219                 passone = 0;
 3220                 BO_UNLOCK(bo);
 3221                 goto again;
 3222         }
 3223         if (waitfor == MNT_WAIT) {
 3224                 while (bo->bo_numoutput) {
 3225                         error = bufobj_wwait(bo, slpflag, slptimeo);
 3226                         if (error) {
 3227                             BO_UNLOCK(bo);
 3228                             error = nfs_sigintr(nmp, td);
 3229                             if (error)
 3230                                 goto done;
 3231                             if (slpflag == PCATCH) {
 3232                                 slpflag = 0;
 3233                                 slptimeo = 2 * hz;
 3234                             }
 3235                             BO_LOCK(bo);
 3236                         }
 3237                 }
 3238                 if (bo->bo_dirty.bv_cnt != 0 && commit) {
 3239                         BO_UNLOCK(bo);
 3240                         goto loop;
 3241                 }
 3242                 /*
 3243                  * Wait for all the async IO requests to drain
 3244                  */
 3245                 BO_UNLOCK(bo);
 3246                 mtx_lock(&np->n_mtx);
 3247                 while (np->n_directio_asyncwr > 0) {
 3248                         np->n_flag |= NFSYNCWAIT;
 3249                         error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr,
 3250                                            &np->n_mtx, slpflag | (PRIBIO + 1), 
 3251                                            "nfsfsync", 0);
 3252                         if (error) {
 3253                                 if (nfs_sigintr(nmp, td)) {
 3254                                         mtx_unlock(&np->n_mtx);
 3255                                         error = EINTR;  
 3256                                         goto done;
 3257                                 }
 3258                         }
 3259                 }
 3260                 mtx_unlock(&np->n_mtx);
 3261         } else
 3262                 BO_UNLOCK(bo);
 3263         mtx_lock(&np->n_mtx);
 3264         if (np->n_flag & NWRITEERR) {
 3265                 error = np->n_error;
 3266                 np->n_flag &= ~NWRITEERR;
 3267         }
 3268         if (commit && bo->bo_dirty.bv_cnt == 0 &&
 3269             bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
 3270                 np->n_flag &= ~NMODIFIED;
 3271         mtx_unlock(&np->n_mtx);
 3272 done:
 3273         if (bvec != NULL && bvec != bvec_on_stack)
 3274                 free(bvec, M_TEMP);
 3275         return (error);
 3276 }
 3277 
 3278 /*
 3279  * NFS advisory byte-level locks.
 3280  */
 3281 static int
 3282 nfs_advlock(struct vop_advlock_args *ap)
 3283 {
 3284         struct vnode *vp = ap->a_vp;
 3285         u_quad_t size;
 3286         int error;
 3287 
 3288         error = vn_lock(vp, LK_SHARED);
 3289         if (error)
 3290                 return (error);
 3291         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3292                 size = VTONFS(vp)->n_size;
 3293                 VOP_UNLOCK(vp, 0);
 3294                 error = lf_advlock(ap, &(vp->v_lockf), size);
 3295         } else {
 3296                 if (nfs_advlock_p)
 3297                         error = nfs_advlock_p(ap);
 3298                 else
 3299                         error = ENOLCK;
 3300         }
 3301 
 3302         return (error);
 3303 }
 3304 
 3305 /*
 3306  * NFS advisory byte-level locks.
 3307  */
 3308 static int
 3309 nfs_advlockasync(struct vop_advlockasync_args *ap)
 3310 {
 3311         struct vnode *vp = ap->a_vp;
 3312         u_quad_t size;
 3313         int error;
 3314         
 3315         error = vn_lock(vp, LK_SHARED);
 3316         if (error)
 3317                 return (error);
 3318         if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
 3319                 size = VTONFS(vp)->n_size;
 3320                 VOP_UNLOCK(vp, 0);
 3321                 error = lf_advlockasync(ap, &(vp->v_lockf), size);
 3322         } else {
 3323                 VOP_UNLOCK(vp, 0);
 3324                 error = EOPNOTSUPP;
 3325         }
 3326         return (error);
 3327 }
 3328 
 3329 /*
 3330  * Print out the contents of an nfsnode.
 3331  */
 3332 static int
 3333 nfs_print(struct vop_print_args *ap)
 3334 {
 3335         struct vnode *vp = ap->a_vp;
 3336         struct nfsnode *np = VTONFS(vp);
 3337 
 3338         nfs_printf("\tfileid %ld fsid 0x%x",
 3339            np->n_vattr.va_fileid, np->n_vattr.va_fsid);
 3340         if (vp->v_type == VFIFO)
 3341                 fifo_printinfo(vp);
 3342         printf("\n");
 3343         return (0);
 3344 }
 3345 
 3346 /*
 3347  * This is the "real" nfs::bwrite(struct buf*).
 3348  * We set B_CACHE if this is a VMIO buffer.
 3349  */
 3350 int
 3351 nfs_writebp(struct buf *bp, int force __unused, struct thread *td)
 3352 {
 3353         int s;
 3354         int oldflags = bp->b_flags;
 3355 #if 0
 3356         int retv = 1;
 3357         off_t off;
 3358 #endif
 3359 
 3360         BUF_ASSERT_HELD(bp);
 3361 
 3362         if (bp->b_flags & B_INVAL) {
 3363                 brelse(bp);
 3364                 return(0);
 3365         }
 3366 
 3367         bp->b_flags |= B_CACHE;
 3368 
 3369         /*
 3370          * Undirty the bp.  We will redirty it later if the I/O fails.
 3371          */
 3372 
 3373         s = splbio();
 3374         bundirty(bp);
 3375         bp->b_flags &= ~B_DONE;
 3376         bp->b_ioflags &= ~BIO_ERROR;
 3377         bp->b_iocmd = BIO_WRITE;
 3378 
 3379         bufobj_wref(bp->b_bufobj);
 3380         curthread->td_ru.ru_oublock++;
 3381         splx(s);
 3382 
 3383         /*
 3384          * Note: to avoid loopback deadlocks, we do not
 3385          * assign b_runningbufspace.
 3386          */
 3387         vfs_busy_pages(bp, 1);
 3388 
 3389         BUF_KERNPROC(bp);
 3390         bp->b_iooffset = dbtob(bp->b_blkno);
 3391         bstrategy(bp);
 3392 
 3393         if( (oldflags & B_ASYNC) == 0) {
 3394                 int rtval = bufwait(bp);
 3395 
 3396                 if (oldflags & B_DELWRI) {
 3397                         s = splbio();
 3398                         reassignbuf(bp);
 3399                         splx(s);
 3400                 }
 3401                 brelse(bp);
 3402                 return (rtval);
 3403         }
 3404 
 3405         return (0);
 3406 }
 3407 
 3408 /*
 3409  * nfs special file access vnode op.
 3410  * Essentially just get vattr and then imitate iaccess() since the device is
 3411  * local to the client.
 3412  */
 3413 static int
 3414 nfsspec_access(struct vop_access_args *ap)
 3415 {
 3416         struct vattr *vap;
 3417         struct ucred *cred = ap->a_cred;
 3418         struct vnode *vp = ap->a_vp;
 3419         accmode_t accmode = ap->a_accmode;
 3420         struct vattr vattr;
 3421         int error;
 3422 
 3423         /*
 3424          * Disallow write attempts on filesystems mounted read-only;
 3425          * unless the file is a socket, fifo, or a block or character
 3426          * device resident on the filesystem.
 3427          */
 3428         if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 3429                 switch (vp->v_type) {
 3430                 case VREG:
 3431                 case VDIR:
 3432                 case VLNK:
 3433                         return (EROFS);
 3434                 default:
 3435                         break;
 3436                 }
 3437         }
 3438         vap = &vattr;
 3439         error = VOP_GETATTR(vp, vap, cred);
 3440         if (error)
 3441                 goto out;
 3442         error  = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
 3443                          accmode, cred, NULL);
 3444 out:
 3445         return error;
 3446 }
 3447 
 3448 /*
 3449  * Read wrapper for fifos.
 3450  */
 3451 static int
 3452 nfsfifo_read(struct vop_read_args *ap)
 3453 {
 3454         struct nfsnode *np = VTONFS(ap->a_vp);
 3455         int error;
 3456 
 3457         /*
 3458          * Set access flag.
 3459          */
 3460         mtx_lock(&np->n_mtx);
 3461         np->n_flag |= NACC;
 3462         vfs_timestamp(&np->n_atim);
 3463         mtx_unlock(&np->n_mtx);
 3464         error = fifo_specops.vop_read(ap);
 3465         return error;   
 3466 }
 3467 
 3468 /*
 3469  * Write wrapper for fifos.
 3470  */
 3471 static int
 3472 nfsfifo_write(struct vop_write_args *ap)
 3473 {
 3474         struct nfsnode *np = VTONFS(ap->a_vp);
 3475 
 3476         /*
 3477          * Set update flag.
 3478          */
 3479         mtx_lock(&np->n_mtx);
 3480         np->n_flag |= NUPD;
 3481         vfs_timestamp(&np->n_mtim);
 3482         mtx_unlock(&np->n_mtx);
 3483         return(fifo_specops.vop_write(ap));
 3484 }
 3485 
 3486 /*
 3487  * Close wrapper for fifos.
 3488  *
 3489  * Update the times on the nfsnode then do fifo close.
 3490  */
 3491 static int
 3492 nfsfifo_close(struct vop_close_args *ap)
 3493 {
 3494         struct vnode *vp = ap->a_vp;
 3495         struct nfsnode *np = VTONFS(vp);
 3496         struct vattr vattr;
 3497         struct timespec ts;
 3498 
 3499         mtx_lock(&np->n_mtx);
 3500         if (np->n_flag & (NACC | NUPD)) {
 3501                 vfs_timestamp(&ts);
 3502                 if (np->n_flag & NACC)
 3503                         np->n_atim = ts;
 3504                 if (np->n_flag & NUPD)
 3505                         np->n_mtim = ts;
 3506                 np->n_flag |= NCHG;
 3507                 if (vrefcnt(vp) == 1 &&
 3508                     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 3509                         VATTR_NULL(&vattr);
 3510                         if (np->n_flag & NACC)
 3511                                 vattr.va_atime = np->n_atim;
 3512                         if (np->n_flag & NUPD)
 3513                                 vattr.va_mtime = np->n_mtim;
 3514                         mtx_unlock(&np->n_mtx);
 3515                         (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 3516                         goto out;
 3517                 }
 3518         }
 3519         mtx_unlock(&np->n_mtx);
 3520 out:
 3521         return (fifo_specops.vop_close(ap));
 3522 }
 3523 
 3524 /*
 3525  * Just call nfs_writebp() with the force argument set to 1.
 3526  *
 3527  * NOTE: B_DONE may or may not be set in a_bp on call.
 3528  */
 3529 static int
 3530 nfs_bwrite(struct buf *bp)
 3531 {
 3532 
 3533         return (nfs_writebp(bp, 1, curthread));
 3534 }
 3535 
 3536 struct buf_ops buf_ops_nfs = {
 3537         .bop_name       =       "buf_ops_nfs",
 3538         .bop_write      =       nfs_bwrite,
 3539         .bop_strategy   =       bufstrategy,
 3540         .bop_sync       =       bufsync,
 3541         .bop_bdflush    =       bufbdflush,
 3542 };

Cache object: 63ea07a313ee51dad59e7348257215bd


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