nfs_clsubs.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Rick Macklem at The University of Guelph.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from nfs_subs.c  8.8 (Berkeley) 5/22/95
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 /*
   41  * These functions support the macros and help fiddle mbuf chains for
   42  * the nfs op functions. They do things like create the rpc header and
   43  * copy data between mbuf chains and uio lists.
   44  */
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/kernel.h>
   49 #include <sys/bio.h>
   50 #include <sys/buf.h>
   51 #include <sys/proc.h>
   52 #include <sys/mount.h>
   53 #include <sys/vnode.h>
   54 #include <sys/namei.h>
   55 #include <sys/mbuf.h>
   56 #include <sys/socket.h>
   57 #include <sys/stat.h>
   58 #include <sys/malloc.h>
   59 #include <sys/syscall.h>
   60 #include <sys/sysproto.h>
   61 #include <sys/taskqueue.h>
   62 
   63 #include <vm/vm.h>
   64 #include <vm/vm_object.h>
   65 #include <vm/vm_extern.h>
   66 #include <vm/uma.h>
   67 
   68 #include <fs/nfs/nfsport.h>
   69 #include <fs/nfsclient/nfsnode.h>
   70 #include <fs/nfsclient/nfsmount.h>
   71 #include <fs/nfsclient/nfs.h>
   72 #include <fs/nfsclient/nfs_kdtrace.h>
   73 
   74 #include <netinet/in.h>
   75 
   76 /*
   77  * Note that stdarg.h and the ANSI style va_start macro is used for both
   78  * ANSI and traditional C compilers.
   79  */
   80 #include <machine/stdarg.h>
   81 
   82 extern struct mtx ncl_iod_mutex;
   83 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON];
   84 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON];
   85 extern int ncl_numasync;
   86 extern unsigned int ncl_iodmax;
   87 extern struct nfsstatsv1 nfsstatsv1;
   88 
   89 struct task     ncl_nfsiodnew_task;
   90 
   91 int
   92 ncl_uninit(struct vfsconf *vfsp)
   93 {
   94         /*
   95          * XXX: Unloading of nfscl module is unsupported.
   96          */
   97 #if 0
   98         int i;
   99 
  100         /*
  101          * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
  102          * any sleeping nfsiods so they check ncl_iodmax and exit.
  103          */
  104         NFSLOCKIOD();
  105         ncl_iodmax = 0;
  106         for (i = 0; i < ncl_numasync; i++)
  107                 if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
  108                         wakeup(&ncl_iodwant[i]);
  109         /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
  110         while (ncl_numasync)
  111                 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
  112         NFSUNLOCKIOD();
  113         ncl_nhuninit();
  114         return (0);
  115 #else
  116         return (EOPNOTSUPP);
  117 #endif
  118 }
  119 
  120 /* Returns with NFSLOCKNODE() held. */
  121 void 
  122 ncl_dircookie_lock(struct nfsnode *np)
  123 {
  124         NFSLOCKNODE(np);
  125         while (np->n_flag & NDIRCOOKIELK)
  126                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  127         np->n_flag |= NDIRCOOKIELK;
  128 }
  129 
  130 void 
  131 ncl_dircookie_unlock(struct nfsnode *np)
  132 {
  133         NFSLOCKNODE(np);
  134         np->n_flag &= ~NDIRCOOKIELK;
  135         wakeup(&np->n_flag);
  136         NFSUNLOCKNODE(np);
  137 }
  138 
  139 bool
  140 ncl_excl_start(struct vnode *vp)
  141 {
  142         struct nfsnode *np;
  143         int vn_lk;
  144 
  145         ASSERT_VOP_LOCKED(vp, "ncl_excl_start");
  146         vn_lk = NFSVOPISLOCKED(vp);
  147         if (vn_lk == LK_EXCLUSIVE)
  148                 return (false);
  149         KASSERT(vn_lk == LK_SHARED,
  150             ("ncl_excl_start: wrong vnode lock %d", vn_lk));
  151         /* Ensure exclusive access, this might block */
  152         np = VTONFS(vp);
  153         lockmgr(&np->n_excl, LK_EXCLUSIVE, NULL);
  154         return (true);
  155 }
  156 
  157 void
  158 ncl_excl_finish(struct vnode *vp, bool old_lock)
  159 {
  160         struct nfsnode *np;
  161 
  162         if (!old_lock)
  163                 return;
  164         np = VTONFS(vp);
  165         lockmgr(&np->n_excl, LK_RELEASE, NULL);
  166 }
  167 
  168 #ifdef NFS_ACDEBUG
  169 #include <sys/sysctl.h>
  170 SYSCTL_DECL(_vfs_nfs);
  171 static int nfs_acdebug;
  172 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  173 #endif
  174 
  175 /*
  176  * Check the time stamp
  177  * If the cache is valid, copy contents to *vap and return 0
  178  * otherwise return an error
  179  */
  180 int
  181 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
  182 {
  183         struct nfsnode *np;
  184         struct vattr *vap;
  185         struct nfsmount *nmp;
  186         int timeo, mustflush;
  187         u_quad_t nsize;
  188         bool setnsize;
  189 
  190         np = VTONFS(vp);
  191         vap = &np->n_vattr.na_vattr;
  192         nmp = VFSTONFS(vp->v_mount);
  193         mustflush = nfscl_mustflush(vp);        /* must be before mtx_lock() */
  194         NFSLOCKNODE(np);
  195         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  196         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  197 
  198 #ifdef NFS_ACDEBUG
  199         if (nfs_acdebug>1)
  200                 printf("ncl_getattrcache: initial timeo = %d\n", timeo);
  201 #endif
  202 
  203         if (vap->va_type == VDIR) {
  204                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  205                         timeo = nmp->nm_acdirmin;
  206                 else if (timeo > nmp->nm_acdirmax)
  207                         timeo = nmp->nm_acdirmax;
  208         } else {
  209                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  210                         timeo = nmp->nm_acregmin;
  211                 else if (timeo > nmp->nm_acregmax)
  212                         timeo = nmp->nm_acregmax;
  213         }
  214 
  215 #ifdef NFS_ACDEBUG
  216         if (nfs_acdebug > 2)
  217                 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  218                     nmp->nm_acregmin, nmp->nm_acregmax,
  219                     nmp->nm_acdirmin, nmp->nm_acdirmax);
  220 
  221         if (nfs_acdebug)
  222                 printf("ncl_getattrcache: age = %d; final timeo = %d\n",
  223                     (time_second - np->n_attrstamp), timeo);
  224 #endif
  225 
  226         if ((time_second - np->n_attrstamp) >= timeo &&
  227             (mustflush != 0 || np->n_attrstamp == 0)) {
  228                 nfsstatsv1.attrcache_misses++;
  229                 NFSUNLOCKNODE(np);
  230                 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
  231                 return( ENOENT);
  232         }
  233         nfsstatsv1.attrcache_hits++;
  234         setnsize = false;
  235         if (vap->va_size != np->n_size) {
  236                 if (vap->va_type == VREG) {
  237                         if (np->n_flag & NMODIFIED) {
  238                                 if (vap->va_size < np->n_size)
  239                                         vap->va_size = np->n_size;
  240                                 else
  241                                         np->n_size = vap->va_size;
  242                         } else {
  243                                 np->n_size = vap->va_size;
  244                         }
  245                         setnsize = ncl_pager_setsize(vp, &nsize);
  246                 } else {
  247                         np->n_size = vap->va_size;
  248                 }
  249         }
  250         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  251         if (np->n_flag & NCHG) {
  252                 if (np->n_flag & NACC)
  253                         vaper->va_atime = np->n_atim;
  254                 if (np->n_flag & NUPD)
  255                         vaper->va_mtime = np->n_mtim;
  256         }
  257         NFSUNLOCKNODE(np);
  258         if (setnsize)
  259                 vnode_pager_setsize(vp, nsize);
  260         KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
  261         return (0);
  262 }
  263 
  264 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  265 /*
  266  * This function finds the directory cookie that corresponds to the
  267  * logical byte offset given.
  268  */
  269 nfsuint64 *
  270 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  271 {
  272         struct nfsdmap *dp, *dp2;
  273         int pos;
  274         nfsuint64 *retval = NULL;
  275 
  276         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  277         if (pos == 0 || off < 0) {
  278                 KASSERT(!add, ("nfs getcookie add at <= 0"));
  279                 return (&nfs_nullcookie);
  280         }
  281         pos--;
  282         dp = LIST_FIRST(&np->n_cookies);
  283         if (!dp) {
  284                 if (add) {
  285                         dp = malloc(sizeof (struct nfsdmap),
  286                                 M_NFSDIROFF, M_WAITOK);
  287                         dp->ndm_eocookie = 0;
  288                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  289                 } else
  290                         goto out;
  291         }
  292         while (pos >= NFSNUMCOOKIES) {
  293                 pos -= NFSNUMCOOKIES;
  294                 if (LIST_NEXT(dp, ndm_list)) {
  295                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  296                             pos >= dp->ndm_eocookie)
  297                                 goto out;
  298                         dp = LIST_NEXT(dp, ndm_list);
  299                 } else if (add) {
  300                         dp2 = malloc(sizeof (struct nfsdmap),
  301                                 M_NFSDIROFF, M_WAITOK);
  302                         dp2->ndm_eocookie = 0;
  303                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  304                         dp = dp2;
  305                 } else
  306                         goto out;
  307         }
  308         if (pos >= dp->ndm_eocookie) {
  309                 if (add)
  310                         dp->ndm_eocookie = pos + 1;
  311                 else
  312                         goto out;
  313         }
  314         retval = &dp->ndm_cookies[pos];
  315 out:
  316         return (retval);
  317 }
  318 
  319 /*
  320  * Invalidate cached directory information, except for the actual directory
  321  * blocks (which are invalidated separately).
  322  * Done mainly to avoid the use of stale offset cookies.
  323  */
  324 void
  325 ncl_invaldir(struct vnode *vp)
  326 {
  327         struct nfsnode *np = VTONFS(vp);
  328 
  329         KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
  330         ncl_dircookie_lock(np);
  331         np->n_direofoffset = 0;
  332         NFSUNLOCKNODE(np);
  333         np->n_cookieverf.nfsuquad[0] = 0;
  334         np->n_cookieverf.nfsuquad[1] = 0;
  335         if (LIST_FIRST(&np->n_cookies))
  336                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  337         ncl_dircookie_unlock(np);
  338 }
  339 
  340 /*
  341  * The write verifier has changed (probably due to a server reboot), so all
  342  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  343  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  344  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  345  * mount point.
  346  *
  347  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  348  * writes are not clusterable.
  349  */
  350 void
  351 ncl_clearcommit(struct mount *mp)
  352 {
  353         struct vnode *vp, *nvp;
  354         struct buf *bp, *nbp;
  355         struct bufobj *bo;
  356 
  357         MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
  358                 bo = &vp->v_bufobj;
  359                 vholdl(vp);
  360                 VI_UNLOCK(vp);
  361                 BO_LOCK(bo);
  362                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  363                         if (!BUF_ISLOCKED(bp) &&
  364                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  365                                 == (B_DELWRI | B_NEEDCOMMIT))
  366                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  367                 }
  368                 BO_UNLOCK(bo);
  369                 vdrop(vp);
  370         }
  371 }
  372 
  373 /*
  374  * Called once to initialize data structures...
  375  */
  376 int
  377 ncl_init(struct vfsconf *vfsp)
  378 {
  379         int i;
  380 
  381         /* Ensure async daemons disabled */
  382         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  383                 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  384                 ncl_iodmount[i] = NULL;
  385         }
  386         TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
  387         ncl_nhinit();                   /* Init the nfsnode table */
  388 
  389         return (0);
  390 }
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FreeBSD/Linux Kernel Cross Reference sys/fs/nfsclient/nfs_clsubs.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/nfs_clsubs.c
