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: stable/11/sys/fs/nfsclient/nfs_clsubs.c 331722 2018-03-29 02:50:57Z eadler $");
   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 bool
  139 ncl_excl_start(struct vnode *vp)
  140 {
  141         struct nfsnode *np;
  142         int vn_lk;
  143 
  144         ASSERT_VOP_LOCKED(vp, "ncl_excl_start");
  145         vn_lk = NFSVOPISLOCKED(vp);
  146         if (vn_lk == LK_EXCLUSIVE)
  147                 return (false);
  148         KASSERT(vn_lk == LK_SHARED,
  149             ("ncl_excl_start: wrong vnode lock %d", vn_lk));
  150         /* Ensure exclusive access, this might block */
  151         np = VTONFS(vp);
  152         lockmgr(&np->n_excl, LK_EXCLUSIVE, NULL);
  153         return (true);
  154 }
  155 
  156 void
  157 ncl_excl_finish(struct vnode *vp, bool old_lock)
  158 {
  159         struct nfsnode *np;
  160 
  161         if (!old_lock)
  162                 return;
  163         np = VTONFS(vp);
  164         lockmgr(&np->n_excl, LK_RELEASE, NULL);
  165 }
  166 
  167 #ifdef NFS_ACDEBUG
  168 #include <sys/sysctl.h>
  169 SYSCTL_DECL(_vfs_nfs);
  170 static int nfs_acdebug;
  171 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  172 #endif
  173 
  174 /*
  175  * Check the time stamp
  176  * If the cache is valid, copy contents to *vap and return 0
  177  * otherwise return an error
  178  */
  179 int
  180 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
  181 {
  182         struct nfsnode *np;
  183         struct vattr *vap;
  184         struct nfsmount *nmp;
  185         int timeo, mustflush;
  186         
  187         np = VTONFS(vp);
  188         vap = &np->n_vattr.na_vattr;
  189         nmp = VFSTONFS(vp->v_mount);
  190         mustflush = nfscl_mustflush(vp);        /* must be before mtx_lock() */
  191         mtx_lock(&np->n_mtx);
  192         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  193         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  194 
  195 #ifdef NFS_ACDEBUG
  196         if (nfs_acdebug>1)
  197                 printf("ncl_getattrcache: initial timeo = %d\n", timeo);
  198 #endif
  199 
  200         if (vap->va_type == VDIR) {
  201                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  202                         timeo = nmp->nm_acdirmin;
  203                 else if (timeo > nmp->nm_acdirmax)
  204                         timeo = nmp->nm_acdirmax;
  205         } else {
  206                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  207                         timeo = nmp->nm_acregmin;
  208                 else if (timeo > nmp->nm_acregmax)
  209                         timeo = nmp->nm_acregmax;
  210         }
  211 
  212 #ifdef NFS_ACDEBUG
  213         if (nfs_acdebug > 2)
  214                 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  215                     nmp->nm_acregmin, nmp->nm_acregmax,
  216                     nmp->nm_acdirmin, nmp->nm_acdirmax);
  217 
  218         if (nfs_acdebug)
  219                 printf("ncl_getattrcache: age = %d; final timeo = %d\n",
  220                     (time_second - np->n_attrstamp), timeo);
  221 #endif
  222 
  223         if ((time_second - np->n_attrstamp) >= timeo &&
  224             (mustflush != 0 || np->n_attrstamp == 0)) {
  225                 nfsstatsv1.attrcache_misses++;
  226                 mtx_unlock(&np->n_mtx);
  227                 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
  228                 return( ENOENT);
  229         }
  230         nfsstatsv1.attrcache_hits++;
  231         if (vap->va_size != np->n_size) {
  232                 if (vap->va_type == VREG) {
  233                         if (np->n_flag & NMODIFIED) {
  234                                 if (vap->va_size < np->n_size)
  235                                         vap->va_size = np->n_size;
  236                                 else
  237                                         np->n_size = vap->va_size;
  238                         } else {
  239                                 np->n_size = vap->va_size;
  240                         }
  241                         vnode_pager_setsize(vp, np->n_size);
  242                 } else {
  243                         np->n_size = vap->va_size;
  244                 }
  245         }
  246         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  247         if (np->n_flag & NCHG) {
  248                 if (np->n_flag & NACC)
  249                         vaper->va_atime = np->n_atim;
  250                 if (np->n_flag & NUPD)
  251                         vaper->va_mtime = np->n_mtim;
  252         }
  253         mtx_unlock(&np->n_mtx);
  254         KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
  255         return (0);
  256 }
  257 
  258 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  259 /*
  260  * This function finds the directory cookie that corresponds to the
  261  * logical byte offset given.
  262  */
  263 nfsuint64 *
  264 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  265 {
  266         struct nfsdmap *dp, *dp2;
  267         int pos;
  268         nfsuint64 *retval = NULL;
  269         
  270         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  271         if (pos == 0 || off < 0) {
  272                 KASSERT(!add, ("nfs getcookie add at <= 0"));
  273                 return (&nfs_nullcookie);
  274         }
  275         pos--;
  276         dp = LIST_FIRST(&np->n_cookies);
  277         if (!dp) {
  278                 if (add) {
  279                         MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
  280                                 M_NFSDIROFF, M_WAITOK);
  281                         dp->ndm_eocookie = 0;
  282                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  283                 } else
  284                         goto out;
  285         }
  286         while (pos >= NFSNUMCOOKIES) {
  287                 pos -= NFSNUMCOOKIES;
  288                 if (LIST_NEXT(dp, ndm_list)) {
  289                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  290                             pos >= dp->ndm_eocookie)
  291                                 goto out;
  292                         dp = LIST_NEXT(dp, ndm_list);
  293                 } else if (add) {
  294                         MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
  295                                 M_NFSDIROFF, M_WAITOK);
  296                         dp2->ndm_eocookie = 0;
  297                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  298                         dp = dp2;
  299                 } else
  300                         goto out;
  301         }
  302         if (pos >= dp->ndm_eocookie) {
  303                 if (add)
  304                         dp->ndm_eocookie = pos + 1;
  305                 else
  306                         goto out;
  307         }
  308         retval = &dp->ndm_cookies[pos];
  309 out:
  310         return (retval);
  311 }
  312 
  313 /*
  314  * Invalidate cached directory information, except for the actual directory
  315  * blocks (which are invalidated separately).
  316  * Done mainly to avoid the use of stale offset cookies.
  317  */
  318 void
  319 ncl_invaldir(struct vnode *vp)
  320 {
  321         struct nfsnode *np = VTONFS(vp);
  322 
  323         KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
  324         ncl_dircookie_lock(np);
  325         np->n_direofoffset = 0;
  326         np->n_cookieverf.nfsuquad[0] = 0;
  327         np->n_cookieverf.nfsuquad[1] = 0;
  328         if (LIST_FIRST(&np->n_cookies))
  329                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  330         ncl_dircookie_unlock(np);
  331 }
  332 
  333 /*
  334  * The write verifier has changed (probably due to a server reboot), so all
  335  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  336  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  337  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  338  * mount point.
  339  *
  340  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  341  * writes are not clusterable.
  342  */
  343 void
  344 ncl_clearcommit(struct mount *mp)
  345 {
  346         struct vnode *vp, *nvp;
  347         struct buf *bp, *nbp;
  348         struct bufobj *bo;
  349 
  350         MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
  351                 bo = &vp->v_bufobj;
  352                 vholdl(vp);
  353                 VI_UNLOCK(vp);
  354                 BO_LOCK(bo);
  355                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  356                         if (!BUF_ISLOCKED(bp) &&
  357                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  358                                 == (B_DELWRI | B_NEEDCOMMIT))
  359                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  360                 }
  361                 BO_UNLOCK(bo);
  362                 vdrop(vp);
  363         }
  364 }
  365 
  366 /*
  367  * Called once to initialize data structures...
  368  */
  369 int
  370 ncl_init(struct vfsconf *vfsp)
  371 {
  372         int i;
  373 
  374         /* Ensure async daemons disabled */
  375         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  376                 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  377                 ncl_iodmount[i] = NULL;
  378         }
  379         TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
  380         ncl_nhinit();                   /* Init the nfsnode table */
  381 
  382         return (0);
  383 }
  384 

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