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  * 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  *      from nfs_subs.c  8.8 (Berkeley) 5/22/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/11.1/sys/fs/nfsclient/nfs_clsubs.c 306609 2016-10-03 00:10:14Z rmacklem $");
   37 
   38 /*
   39  * These functions support the macros and help fiddle mbuf chains for
   40  * the nfs op functions. They do things like create the rpc header and
   41  * copy data between mbuf chains and uio lists.
   42  */
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/kernel.h>
   47 #include <sys/bio.h>
   48 #include <sys/buf.h>
   49 #include <sys/proc.h>
   50 #include <sys/mount.h>
   51 #include <sys/vnode.h>
   52 #include <sys/namei.h>
   53 #include <sys/mbuf.h>
   54 #include <sys/socket.h>
   55 #include <sys/stat.h>
   56 #include <sys/malloc.h>
   57 #include <sys/sysent.h>
   58 #include <sys/syscall.h>
   59 #include <sys/sysproto.h>
   60 #include <sys/taskqueue.h>
   61 
   62 #include <vm/vm.h>
   63 #include <vm/vm_object.h>
   64 #include <vm/vm_extern.h>
   65 #include <vm/uma.h>
   66 
   67 #include <fs/nfs/nfsport.h>
   68 #include <fs/nfsclient/nfsnode.h>
   69 #include <fs/nfsclient/nfsmount.h>
   70 #include <fs/nfsclient/nfs.h>
   71 #include <fs/nfsclient/nfs_kdtrace.h>
   72 
   73 #include <netinet/in.h>
   74 
   75 /*
   76  * Note that stdarg.h and the ANSI style va_start macro is used for both
   77  * ANSI and traditional C compilers.
   78  */
   79 #include <machine/stdarg.h>
   80 
   81 extern struct mtx ncl_iod_mutex;
   82 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON];
   83 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON];
   84 extern int ncl_numasync;
   85 extern unsigned int ncl_iodmax;
   86 extern struct nfsstatsv1 nfsstatsv1;
   87 
   88 struct task     ncl_nfsiodnew_task;
   89 
   90 int
   91 ncl_uninit(struct vfsconf *vfsp)
   92 {
   93         /*
   94          * XXX: Unloading of nfscl module is unsupported.
   95          */
   96 #if 0
   97         int i;
   98 
   99         /*
  100          * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
  101          * any sleeping nfsiods so they check ncl_iodmax and exit.
  102          */
  103         mtx_lock(&ncl_iod_mutex);
  104         ncl_iodmax = 0;
  105         for (i = 0; i < ncl_numasync; i++)
  106                 if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
  107                         wakeup(&ncl_iodwant[i]);
  108         /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
  109         while (ncl_numasync)
  110                 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
  111         mtx_unlock(&ncl_iod_mutex);
  112         ncl_nhuninit();
  113         return (0);
  114 #else
  115         return (EOPNOTSUPP);
  116 #endif
  117 }
  118 
  119 void 
  120 ncl_dircookie_lock(struct nfsnode *np)
  121 {
  122         mtx_lock(&np->n_mtx);
  123         while (np->n_flag & NDIRCOOKIELK)
  124                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  125         np->n_flag |= NDIRCOOKIELK;
  126         mtx_unlock(&np->n_mtx);
  127 }
  128 
  129 void 
  130 ncl_dircookie_unlock(struct nfsnode *np)
  131 {
  132         mtx_lock(&np->n_mtx);
  133         np->n_flag &= ~NDIRCOOKIELK;
  134         wakeup(&np->n_flag);
  135         mtx_unlock(&np->n_mtx);
  136 }
  137 
  138 int
  139 ncl_upgrade_vnlock(struct vnode *vp)
  140 {
  141         int old_lock;
  142 
  143         ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock");
  144         old_lock = NFSVOPISLOCKED(vp);
  145         if (old_lock != LK_EXCLUSIVE) {
  146                 KASSERT(old_lock == LK_SHARED,
  147                     ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock));
  148                 /* Upgrade to exclusive lock, this might block */
  149                 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
  150         }
  151         return (old_lock);
  152 }
  153 
  154 void
  155 ncl_downgrade_vnlock(struct vnode *vp, int old_lock)
  156 {
  157         if (old_lock != LK_EXCLUSIVE) {
  158                 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
  159                 /* Downgrade from exclusive lock. */
  160                 NFSVOPLOCK(vp, LK_DOWNGRADE | LK_RETRY);
  161         }
  162 }
  163 
  164 #ifdef NFS_ACDEBUG
  165 #include <sys/sysctl.h>
  166 SYSCTL_DECL(_vfs_nfs);
  167 static int nfs_acdebug;
  168 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  169 #endif
  170 
  171 /*
  172  * Check the time stamp
  173  * If the cache is valid, copy contents to *vap and return 0
  174  * otherwise return an error
  175  */
  176 int
  177 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
  178 {
  179         struct nfsnode *np;
  180         struct vattr *vap;
  181         struct nfsmount *nmp;
  182         int timeo, mustflush;
  183         
  184         np = VTONFS(vp);
  185         vap = &np->n_vattr.na_vattr;
  186         nmp = VFSTONFS(vp->v_mount);
  187         mustflush = nfscl_mustflush(vp);        /* must be before mtx_lock() */
  188         mtx_lock(&np->n_mtx);
  189         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  190         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  191 
  192 #ifdef NFS_ACDEBUG
  193         if (nfs_acdebug>1)
  194                 printf("ncl_getattrcache: initial timeo = %d\n", timeo);
  195 #endif
  196 
  197         if (vap->va_type == VDIR) {
  198                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  199                         timeo = nmp->nm_acdirmin;
  200                 else if (timeo > nmp->nm_acdirmax)
  201                         timeo = nmp->nm_acdirmax;
  202         } else {
  203                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  204                         timeo = nmp->nm_acregmin;
  205                 else if (timeo > nmp->nm_acregmax)
  206                         timeo = nmp->nm_acregmax;
  207         }
  208 
  209 #ifdef NFS_ACDEBUG
  210         if (nfs_acdebug > 2)
  211                 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  212                     nmp->nm_acregmin, nmp->nm_acregmax,
  213                     nmp->nm_acdirmin, nmp->nm_acdirmax);
  214 
  215         if (nfs_acdebug)
  216                 printf("ncl_getattrcache: age = %d; final timeo = %d\n",
  217                     (time_second - np->n_attrstamp), timeo);
  218 #endif
  219 
  220         if ((time_second - np->n_attrstamp) >= timeo &&
  221             (mustflush != 0 || np->n_attrstamp == 0)) {
  222                 nfsstatsv1.attrcache_misses++;
  223                 mtx_unlock(&np->n_mtx);
  224                 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
  225                 return( ENOENT);
  226         }
  227         nfsstatsv1.attrcache_hits++;
  228         if (vap->va_size != np->n_size) {
  229                 if (vap->va_type == VREG) {
  230                         if (np->n_flag & NMODIFIED) {
  231                                 if (vap->va_size < np->n_size)
  232                                         vap->va_size = np->n_size;
  233                                 else
  234                                         np->n_size = vap->va_size;
  235                         } else {
  236                                 np->n_size = vap->va_size;
  237                         }
  238                         vnode_pager_setsize(vp, np->n_size);
  239                 } else {
  240                         np->n_size = vap->va_size;
  241                 }
  242         }
  243         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  244         if (np->n_flag & NCHG) {
  245                 if (np->n_flag & NACC)
  246                         vaper->va_atime = np->n_atim;
  247                 if (np->n_flag & NUPD)
  248                         vaper->va_mtime = np->n_mtim;
  249         }
  250         mtx_unlock(&np->n_mtx);
  251         KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
  252         return (0);
  253 }
  254 
  255 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  256 /*
  257  * This function finds the directory cookie that corresponds to the
  258  * logical byte offset given.
  259  */
  260 nfsuint64 *
  261 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  262 {
  263         struct nfsdmap *dp, *dp2;
  264         int pos;
  265         nfsuint64 *retval = NULL;
  266         
  267         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  268         if (pos == 0 || off < 0) {
  269                 KASSERT(!add, ("nfs getcookie add at <= 0"));
  270                 return (&nfs_nullcookie);
  271         }
  272         pos--;
  273         dp = LIST_FIRST(&np->n_cookies);
  274         if (!dp) {
  275                 if (add) {
  276                         MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
  277                                 M_NFSDIROFF, M_WAITOK);
  278                         dp->ndm_eocookie = 0;
  279                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  280                 } else
  281                         goto out;
  282         }
  283         while (pos >= NFSNUMCOOKIES) {
  284                 pos -= NFSNUMCOOKIES;
  285                 if (LIST_NEXT(dp, ndm_list)) {
  286                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  287                             pos >= dp->ndm_eocookie)
  288                                 goto out;
  289                         dp = LIST_NEXT(dp, ndm_list);
  290                 } else if (add) {
  291                         MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
  292                                 M_NFSDIROFF, M_WAITOK);
  293                         dp2->ndm_eocookie = 0;
  294                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  295                         dp = dp2;
  296                 } else
  297                         goto out;
  298         }
  299         if (pos >= dp->ndm_eocookie) {
  300                 if (add)
  301                         dp->ndm_eocookie = pos + 1;
  302                 else
  303                         goto out;
  304         }
  305         retval = &dp->ndm_cookies[pos];
  306 out:
  307         return (retval);
  308 }
  309 
  310 /*
  311  * Invalidate cached directory information, except for the actual directory
  312  * blocks (which are invalidated separately).
  313  * Done mainly to avoid the use of stale offset cookies.
  314  */
  315 void
  316 ncl_invaldir(struct vnode *vp)
  317 {
  318         struct nfsnode *np = VTONFS(vp);
  319 
  320         KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
  321         ncl_dircookie_lock(np);
  322         np->n_direofoffset = 0;
  323         np->n_cookieverf.nfsuquad[0] = 0;
  324         np->n_cookieverf.nfsuquad[1] = 0;
  325         if (LIST_FIRST(&np->n_cookies))
  326                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  327         ncl_dircookie_unlock(np);
  328 }
  329 
  330 /*
  331  * The write verifier has changed (probably due to a server reboot), so all
  332  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  333  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  334  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  335  * mount point.
  336  *
  337  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  338  * writes are not clusterable.
  339  */
  340 void
  341 ncl_clearcommit(struct mount *mp)
  342 {
  343         struct vnode *vp, *nvp;
  344         struct buf *bp, *nbp;
  345         struct bufobj *bo;
  346 
  347         MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
  348                 bo = &vp->v_bufobj;
  349                 vholdl(vp);
  350                 VI_UNLOCK(vp);
  351                 BO_LOCK(bo);
  352                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  353                         if (!BUF_ISLOCKED(bp) &&
  354                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  355                                 == (B_DELWRI | B_NEEDCOMMIT))
  356                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  357                 }
  358                 BO_UNLOCK(bo);
  359                 vdrop(vp);
  360         }
  361 }
  362 
  363 /*
  364  * Called once to initialize data structures...
  365  */
  366 int
  367 ncl_init(struct vfsconf *vfsp)
  368 {
  369         int i;
  370 
  371         /* Ensure async daemons disabled */
  372         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  373                 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  374                 ncl_iodmount[i] = NULL;
  375         }
  376         TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
  377         ncl_nhinit();                   /* Init the nfsnode table */
  378 
  379         return (0);
  380 }
  381 

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