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: head/sys/fs/nfsclient/nfs_clsubs.c 328417 2018-01-25 22:25:13Z cem $");
   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         mtx_lock(&ncl_iod_mutex);
  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         mtx_unlock(&ncl_iod_mutex);
  114         ncl_nhuninit();
  115         return (0);
  116 #else
  117         return (EOPNOTSUPP);
  118 #endif
  119 }
  120 
  121 void 
  122 ncl_dircookie_lock(struct nfsnode *np)
  123 {
  124         mtx_lock(&np->n_mtx);
  125         while (np->n_flag & NDIRCOOKIELK)
  126                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  127         np->n_flag |= NDIRCOOKIELK;
  128         mtx_unlock(&np->n_mtx);
  129 }
  130 
  131 void 
  132 ncl_dircookie_unlock(struct nfsnode *np)
  133 {
  134         mtx_lock(&np->n_mtx);
  135         np->n_flag &= ~NDIRCOOKIELK;
  136         wakeup(&np->n_flag);
  137         mtx_unlock(&np->n_mtx);
  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         
  189         np = VTONFS(vp);
  190         vap = &np->n_vattr.na_vattr;
  191         nmp = VFSTONFS(vp->v_mount);
  192         mustflush = nfscl_mustflush(vp);        /* must be before mtx_lock() */
  193         mtx_lock(&np->n_mtx);
  194         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  195         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  196 
  197 #ifdef NFS_ACDEBUG
  198         if (nfs_acdebug>1)
  199                 printf("ncl_getattrcache: initial timeo = %d\n", timeo);
  200 #endif
  201 
  202         if (vap->va_type == VDIR) {
  203                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  204                         timeo = nmp->nm_acdirmin;
  205                 else if (timeo > nmp->nm_acdirmax)
  206                         timeo = nmp->nm_acdirmax;
  207         } else {
  208                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  209                         timeo = nmp->nm_acregmin;
  210                 else if (timeo > nmp->nm_acregmax)
  211                         timeo = nmp->nm_acregmax;
  212         }
  213 
  214 #ifdef NFS_ACDEBUG
  215         if (nfs_acdebug > 2)
  216                 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  217                     nmp->nm_acregmin, nmp->nm_acregmax,
  218                     nmp->nm_acdirmin, nmp->nm_acdirmax);
  219 
  220         if (nfs_acdebug)
  221                 printf("ncl_getattrcache: age = %d; final timeo = %d\n",
  222                     (time_second - np->n_attrstamp), timeo);
  223 #endif
  224 
  225         if ((time_second - np->n_attrstamp) >= timeo &&
  226             (mustflush != 0 || np->n_attrstamp == 0)) {
  227                 nfsstatsv1.attrcache_misses++;
  228                 mtx_unlock(&np->n_mtx);
  229                 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
  230                 return( ENOENT);
  231         }
  232         nfsstatsv1.attrcache_hits++;
  233         if (vap->va_size != np->n_size) {
  234                 if (vap->va_type == VREG) {
  235                         if (np->n_flag & NMODIFIED) {
  236                                 if (vap->va_size < np->n_size)
  237                                         vap->va_size = np->n_size;
  238                                 else
  239                                         np->n_size = vap->va_size;
  240                         } else {
  241                                 np->n_size = vap->va_size;
  242                         }
  243                         vnode_pager_setsize(vp, np->n_size);
  244                 } else {
  245                         np->n_size = vap->va_size;
  246                 }
  247         }
  248         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  249         if (np->n_flag & NCHG) {
  250                 if (np->n_flag & NACC)
  251                         vaper->va_atime = np->n_atim;
  252                 if (np->n_flag & NUPD)
  253                         vaper->va_mtime = np->n_mtim;
  254         }
  255         mtx_unlock(&np->n_mtx);
  256         KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
  257         return (0);
  258 }
  259 
  260 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  261 /*
  262  * This function finds the directory cookie that corresponds to the
  263  * logical byte offset given.
  264  */
  265 nfsuint64 *
  266 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  267 {
  268         struct nfsdmap *dp, *dp2;
  269         int pos;
  270         nfsuint64 *retval = NULL;
  271         
  272         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  273         if (pos == 0 || off < 0) {
  274                 KASSERT(!add, ("nfs getcookie add at <= 0"));
  275                 return (&nfs_nullcookie);
  276         }
  277         pos--;
  278         dp = LIST_FIRST(&np->n_cookies);
  279         if (!dp) {
  280                 if (add) {
  281                         dp = malloc(sizeof (struct nfsdmap),
  282                                 M_NFSDIROFF, M_WAITOK);
  283                         dp->ndm_eocookie = 0;
  284                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  285                 } else
  286                         goto out;
  287         }
  288         while (pos >= NFSNUMCOOKIES) {
  289                 pos -= NFSNUMCOOKIES;
  290                 if (LIST_NEXT(dp, ndm_list)) {
  291                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  292                             pos >= dp->ndm_eocookie)
  293                                 goto out;
  294                         dp = LIST_NEXT(dp, ndm_list);
  295                 } else if (add) {
  296                         dp2 = malloc(sizeof (struct nfsdmap),
  297                                 M_NFSDIROFF, M_WAITOK);
  298                         dp2->ndm_eocookie = 0;
  299                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  300                         dp = dp2;
  301                 } else
  302                         goto out;
  303         }
  304         if (pos >= dp->ndm_eocookie) {
  305                 if (add)
  306                         dp->ndm_eocookie = pos + 1;
  307                 else
  308                         goto out;
  309         }
  310         retval = &dp->ndm_cookies[pos];
  311 out:
  312         return (retval);
  313 }
  314 
  315 /*
  316  * Invalidate cached directory information, except for the actual directory
  317  * blocks (which are invalidated separately).
  318  * Done mainly to avoid the use of stale offset cookies.
  319  */
  320 void
  321 ncl_invaldir(struct vnode *vp)
  322 {
  323         struct nfsnode *np = VTONFS(vp);
  324 
  325         KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
  326         ncl_dircookie_lock(np);
  327         np->n_direofoffset = 0;
  328         np->n_cookieverf.nfsuquad[0] = 0;
  329         np->n_cookieverf.nfsuquad[1] = 0;
  330         if (LIST_FIRST(&np->n_cookies))
  331                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  332         ncl_dircookie_unlock(np);
  333 }
  334 
  335 /*
  336  * The write verifier has changed (probably due to a server reboot), so all
  337  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  338  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  339  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  340  * mount point.
  341  *
  342  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  343  * writes are not clusterable.
  344  */
  345 void
  346 ncl_clearcommit(struct mount *mp)
  347 {
  348         struct vnode *vp, *nvp;
  349         struct buf *bp, *nbp;
  350         struct bufobj *bo;
  351 
  352         MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
  353                 bo = &vp->v_bufobj;
  354                 vholdl(vp);
  355                 VI_UNLOCK(vp);
  356                 BO_LOCK(bo);
  357                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  358                         if (!BUF_ISLOCKED(bp) &&
  359                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  360                                 == (B_DELWRI | B_NEEDCOMMIT))
  361                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  362                 }
  363                 BO_UNLOCK(bo);
  364                 vdrop(vp);
  365         }
  366 }
  367 
  368 /*
  369  * Called once to initialize data structures...
  370  */
  371 int
  372 ncl_init(struct vfsconf *vfsp)
  373 {
  374         int i;
  375 
  376         /* Ensure async daemons disabled */
  377         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  378                 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  379                 ncl_iodmount[i] = NULL;
  380         }
  381         TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
  382         ncl_nhinit();                   /* Init the nfsnode table */
  383 
  384         return (0);
  385 }
  386 

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