The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/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: stable/12/sys/fs/nfsclient/nfs_clsubs.c 369472 2021-03-15 20:51:07Z git2svn $");
   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/sysent.h>
   60 #include <sys/syscall.h>
   61 #include <sys/sysproto.h>
   62 #include <sys/taskqueue.h>
   63 
   64 #include <vm/vm.h>
   65 #include <vm/vm_object.h>
   66 #include <vm/vm_extern.h>
   67 #include <vm/uma.h>
   68 
   69 #include <fs/nfs/nfsport.h>
   70 #include <fs/nfsclient/nfsnode.h>
   71 #include <fs/nfsclient/nfsmount.h>
   72 #include <fs/nfsclient/nfs.h>
   73 #include <fs/nfsclient/nfs_kdtrace.h>
   74 
   75 #include <netinet/in.h>
   76 
   77 /*
   78  * Note that stdarg.h and the ANSI style va_start macro is used for both
   79  * ANSI and traditional C compilers.
   80  */
   81 #include <machine/stdarg.h>
   82 
   83 extern struct mtx ncl_iod_mutex;
   84 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON];
   85 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON];
   86 extern int ncl_numasync;
   87 extern unsigned int ncl_iodmax;
   88 extern struct nfsstatsv1 nfsstatsv1;
   89 
   90 struct task     ncl_nfsiodnew_task;
   91 
   92 int
   93 ncl_uninit(struct vfsconf *vfsp)
   94 {
   95         /*
   96          * XXX: Unloading of nfscl module is unsupported.
   97          */
   98 #if 0
   99         int i;
  100 
  101         /*
  102          * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
  103          * any sleeping nfsiods so they check ncl_iodmax and exit.
  104          */
  105         NFSLOCKIOD();
  106         ncl_iodmax = 0;
  107         for (i = 0; i < ncl_numasync; i++)
  108                 if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
  109                         wakeup(&ncl_iodwant[i]);
  110         /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
  111         while (ncl_numasync)
  112                 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
  113         NFSUNLOCKIOD();
  114         ncl_nhuninit();
  115         return (0);
  116 #else
  117         return (EOPNOTSUPP);
  118 #endif
  119 }
  120 
  121 /* Returns with NFSLOCKNODE() held. */
  122 void 
  123 ncl_dircookie_lock(struct nfsnode *np)
  124 {
  125         NFSLOCKNODE(np);
  126         while (np->n_flag & NDIRCOOKIELK)
  127                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  128         np->n_flag |= NDIRCOOKIELK;
  129 }
  130 
  131 void 
  132 ncl_dircookie_unlock(struct nfsnode *np)
  133 {
  134         NFSLOCKNODE(np);
  135         np->n_flag &= ~NDIRCOOKIELK;
  136         wakeup(&np->n_flag);
  137         NFSUNLOCKNODE(np);
  138 }
  139 
  140 bool
  141 ncl_excl_start(struct vnode *vp)
  142 {
  143         struct nfsnode *np;
  144         int vn_lk;
  145 
  146         ASSERT_VOP_LOCKED(vp, "ncl_excl_start");
  147         vn_lk = NFSVOPISLOCKED(vp);
  148         if (vn_lk == LK_EXCLUSIVE)
  149                 return (false);
  150         KASSERT(vn_lk == LK_SHARED,
  151             ("ncl_excl_start: wrong vnode lock %d", vn_lk));
  152         /* Ensure exclusive access, this might block */
  153         np = VTONFS(vp);
  154         lockmgr(&np->n_excl, LK_EXCLUSIVE, NULL);
  155         return (true);
  156 }
  157 
  158 void
  159 ncl_excl_finish(struct vnode *vp, bool old_lock)
  160 {
  161         struct nfsnode *np;
  162 
  163         if (!old_lock)
  164                 return;
  165         np = VTONFS(vp);
  166         lockmgr(&np->n_excl, LK_RELEASE, NULL);
  167 }
  168 
  169 #ifdef NFS_ACDEBUG
  170 #include <sys/sysctl.h>
  171 SYSCTL_DECL(_vfs_nfs);
  172 static int nfs_acdebug;
  173 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  174 #endif
  175 
  176 /*
  177  * Check the time stamp
  178  * If the cache is valid, copy contents to *vap and return 0
  179  * otherwise return an error
  180  */
  181 int
  182 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
  183 {
  184         struct nfsnode *np;
  185         struct vattr *vap;
  186         struct nfsmount *nmp;
  187         int timeo, mustflush;
  188         u_quad_t nsize;
  189         bool setnsize;
  190         
  191         np = VTONFS(vp);
  192         vap = &np->n_vattr.na_vattr;
  193         nmp = VFSTONFS(vp->v_mount);
  194         mustflush = nfscl_mustflush(vp);        /* must be before mtx_lock() */
  195         NFSLOCKNODE(np);
  196         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  197         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  198 
  199 #ifdef NFS_ACDEBUG
  200         if (nfs_acdebug>1)
  201                 printf("ncl_getattrcache: initial timeo = %d\n", timeo);
  202 #endif
  203 
  204         if (vap->va_type == VDIR) {
  205                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  206                         timeo = nmp->nm_acdirmin;
  207                 else if (timeo > nmp->nm_acdirmax)
  208                         timeo = nmp->nm_acdirmax;
  209         } else {
  210                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  211                         timeo = nmp->nm_acregmin;
  212                 else if (timeo > nmp->nm_acregmax)
  213                         timeo = nmp->nm_acregmax;
  214         }
  215 
  216 #ifdef NFS_ACDEBUG
  217         if (nfs_acdebug > 2)
  218                 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  219                     nmp->nm_acregmin, nmp->nm_acregmax,
  220                     nmp->nm_acdirmin, nmp->nm_acdirmax);
  221 
  222         if (nfs_acdebug)
  223                 printf("ncl_getattrcache: age = %d; final timeo = %d\n",
  224                     (time_second - np->n_attrstamp), timeo);
  225 #endif
  226 
  227         if ((time_second - np->n_attrstamp) >= timeo &&
  228             (mustflush != 0 || np->n_attrstamp == 0)) {
  229                 nfsstatsv1.attrcache_misses++;
  230                 NFSUNLOCKNODE(np);
  231                 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
  232                 return( ENOENT);
  233         }
  234         nfsstatsv1.attrcache_hits++;
  235         setnsize = false;
  236         if (vap->va_size != np->n_size) {
  237                 if (vap->va_type == VREG) {
  238                         if (np->n_flag & NMODIFIED) {
  239                                 if (vap->va_size < np->n_size)
  240                                         vap->va_size = np->n_size;
  241                                 else
  242                                         np->n_size = vap->va_size;
  243                         } else {
  244                                 np->n_size = vap->va_size;
  245                         }
  246                         setnsize = ncl_pager_setsize(vp, &nsize);
  247                 } else {
  248                         np->n_size = vap->va_size;
  249                 }
  250         }
  251         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  252         if (np->n_flag & NCHG) {
  253                 if (np->n_flag & NACC)
  254                         vaper->va_atime = np->n_atim;
  255                 if (np->n_flag & NUPD)
  256                         vaper->va_mtime = np->n_mtim;
  257         }
  258         NFSUNLOCKNODE(np);
  259         if (setnsize)
  260                 vnode_pager_setsize(vp, nsize);
  261         KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
  262         return (0);
  263 }
  264 
  265 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  266 /*
  267  * This function finds the directory cookie that corresponds to the
  268  * logical byte offset given.
  269  */
  270 nfsuint64 *
  271 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  272 {
  273         struct nfsdmap *dp, *dp2;
  274         int pos;
  275         nfsuint64 *retval = NULL;
  276         
  277         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  278         if (pos == 0 || off < 0) {
  279                 KASSERT(!add, ("nfs getcookie add at <= 0"));
  280                 return (&nfs_nullcookie);
  281         }
  282         pos--;
  283         dp = LIST_FIRST(&np->n_cookies);
  284         if (!dp) {
  285                 if (add) {
  286                         dp = malloc(sizeof (struct nfsdmap),
  287                                 M_NFSDIROFF, M_WAITOK);
  288                         dp->ndm_eocookie = 0;
  289                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  290                 } else
  291                         goto out;
  292         }
  293         while (pos >= NFSNUMCOOKIES) {
  294                 pos -= NFSNUMCOOKIES;
  295                 if (LIST_NEXT(dp, ndm_list)) {
  296                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  297                             pos >= dp->ndm_eocookie)
  298                                 goto out;
  299                         dp = LIST_NEXT(dp, ndm_list);
  300                 } else if (add) {
  301                         dp2 = malloc(sizeof (struct nfsdmap),
  302                                 M_NFSDIROFF, M_WAITOK);
  303                         dp2->ndm_eocookie = 0;
  304                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  305                         dp = dp2;
  306                 } else
  307                         goto out;
  308         }
  309         if (pos >= dp->ndm_eocookie) {
  310                 if (add)
  311                         dp->ndm_eocookie = pos + 1;
  312                 else
  313                         goto out;
  314         }
  315         retval = &dp->ndm_cookies[pos];
  316 out:
  317         return (retval);
  318 }
  319 
  320 /*
  321  * Invalidate cached directory information, except for the actual directory
  322  * blocks (which are invalidated separately).
  323  * Done mainly to avoid the use of stale offset cookies.
  324  */
  325 void
  326 ncl_invaldir(struct vnode *vp)
  327 {
  328         struct nfsnode *np = VTONFS(vp);
  329 
  330         KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
  331         ncl_dircookie_lock(np);
  332         np->n_direofoffset = 0;
  333         NFSUNLOCKNODE(np);
  334         np->n_cookieverf.nfsuquad[0] = 0;
  335         np->n_cookieverf.nfsuquad[1] = 0;
  336         if (LIST_FIRST(&np->n_cookies))
  337                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  338         ncl_dircookie_unlock(np);
  339 }
  340 
  341 /*
  342  * The write verifier has changed (probably due to a server reboot), so all
  343  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  344  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  345  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  346  * mount point.
  347  *
  348  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  349  * writes are not clusterable.
  350  */
  351 void
  352 ncl_clearcommit(struct mount *mp)
  353 {
  354         struct vnode *vp, *nvp;
  355         struct buf *bp, *nbp;
  356         struct bufobj *bo;
  357 
  358         MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
  359                 bo = &vp->v_bufobj;
  360                 vholdl(vp);
  361                 VI_UNLOCK(vp);
  362                 BO_LOCK(bo);
  363                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  364                         if (!BUF_ISLOCKED(bp) &&
  365                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  366                                 == (B_DELWRI | B_NEEDCOMMIT))
  367                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  368                 }
  369                 BO_UNLOCK(bo);
  370                 vdrop(vp);
  371         }
  372 }
  373 
  374 /*
  375  * Called once to initialize data structures...
  376  */
  377 int
  378 ncl_init(struct vfsconf *vfsp)
  379 {
  380         int i;
  381 
  382         /* Ensure async daemons disabled */
  383         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  384                 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  385                 ncl_iodmount[i] = NULL;
  386         }
  387         TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
  388         ncl_nhinit();                   /* Init the nfsnode table */
  389 
  390         return (0);
  391 }
  392 

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