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/10.4/sys/fs/nfsclient/nfs_clsubs.c 306663 2016-10-03 23:17:57Z rmacklem $");
   37 
   38 #include "opt_kdtrace.h"
   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 nfsstats newnfsstats;
   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 int
  141 ncl_upgrade_vnlock(struct vnode *vp)
  142 {
  143         int old_lock;
  144 
  145         ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock");
  146         old_lock = NFSVOPISLOCKED(vp);
  147         if (old_lock != LK_EXCLUSIVE) {
  148                 KASSERT(old_lock == LK_SHARED,
  149                     ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock));
  150                 /* Upgrade to exclusive lock, this might block */
  151                 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
  152         }
  153         return (old_lock);
  154 }
  155 
  156 void
  157 ncl_downgrade_vnlock(struct vnode *vp, int old_lock)
  158 {
  159         if (old_lock != LK_EXCLUSIVE) {
  160                 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
  161                 /* Downgrade from exclusive lock. */
  162                 NFSVOPLOCK(vp, LK_DOWNGRADE | LK_RETRY);
  163         }
  164 }
  165 
  166 #ifdef NFS_ACDEBUG
  167 #include <sys/sysctl.h>
  168 SYSCTL_DECL(_vfs_nfs);
  169 static int nfs_acdebug;
  170 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  171 #endif
  172 
  173 /*
  174  * Check the time stamp
  175  * If the cache is valid, copy contents to *vap and return 0
  176  * otherwise return an error
  177  */
  178 int
  179 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
  180 {
  181         struct nfsnode *np;
  182         struct vattr *vap;
  183         struct nfsmount *nmp;
  184         int timeo, mustflush;
  185         
  186         np = VTONFS(vp);
  187         vap = &np->n_vattr.na_vattr;
  188         nmp = VFSTONFS(vp->v_mount);
  189         mustflush = nfscl_mustflush(vp);        /* must be before mtx_lock() */
  190         mtx_lock(&np->n_mtx);
  191         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  192         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  193 
  194 #ifdef NFS_ACDEBUG
  195         if (nfs_acdebug>1)
  196                 printf("ncl_getattrcache: initial timeo = %d\n", timeo);
  197 #endif
  198 
  199         if (vap->va_type == VDIR) {
  200                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  201                         timeo = nmp->nm_acdirmin;
  202                 else if (timeo > nmp->nm_acdirmax)
  203                         timeo = nmp->nm_acdirmax;
  204         } else {
  205                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  206                         timeo = nmp->nm_acregmin;
  207                 else if (timeo > nmp->nm_acregmax)
  208                         timeo = nmp->nm_acregmax;
  209         }
  210 
  211 #ifdef NFS_ACDEBUG
  212         if (nfs_acdebug > 2)
  213                 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  214                     nmp->nm_acregmin, nmp->nm_acregmax,
  215                     nmp->nm_acdirmin, nmp->nm_acdirmax);
  216 
  217         if (nfs_acdebug)
  218                 printf("ncl_getattrcache: age = %d; final timeo = %d\n",
  219                     (time_second - np->n_attrstamp), timeo);
  220 #endif
  221 
  222         if ((time_second - np->n_attrstamp) >= timeo &&
  223             (mustflush != 0 || np->n_attrstamp == 0)) {
  224                 newnfsstats.attrcache_misses++;
  225                 mtx_unlock(&np->n_mtx);
  226                 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
  227                 return( ENOENT);
  228         }
  229         newnfsstats.attrcache_hits++;
  230         if (vap->va_size != np->n_size) {
  231                 if (vap->va_type == VREG) {
  232                         if (np->n_flag & NMODIFIED) {
  233                                 if (vap->va_size < np->n_size)
  234                                         vap->va_size = np->n_size;
  235                                 else
  236                                         np->n_size = vap->va_size;
  237                         } else {
  238                                 np->n_size = vap->va_size;
  239                         }
  240                         vnode_pager_setsize(vp, np->n_size);
  241                 } else {
  242                         np->n_size = vap->va_size;
  243                 }
  244         }
  245         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  246         if (np->n_flag & NCHG) {
  247                 if (np->n_flag & NACC)
  248                         vaper->va_atime = np->n_atim;
  249                 if (np->n_flag & NUPD)
  250                         vaper->va_mtime = np->n_mtim;
  251         }
  252         mtx_unlock(&np->n_mtx);
  253         KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
  254         return (0);
  255 }
  256 
  257 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  258 /*
  259  * This function finds the directory cookie that corresponds to the
  260  * logical byte offset given.
  261  */
  262 nfsuint64 *
  263 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  264 {
  265         struct nfsdmap *dp, *dp2;
  266         int pos;
  267         nfsuint64 *retval = NULL;
  268         
  269         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  270         if (pos == 0 || off < 0) {
  271                 KASSERT(!add, ("nfs getcookie add at <= 0"));
  272                 return (&nfs_nullcookie);
  273         }
  274         pos--;
  275         dp = LIST_FIRST(&np->n_cookies);
  276         if (!dp) {
  277                 if (add) {
  278                         MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
  279                                 M_NFSDIROFF, M_WAITOK);
  280                         dp->ndm_eocookie = 0;
  281                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  282                 } else
  283                         goto out;
  284         }
  285         while (pos >= NFSNUMCOOKIES) {
  286                 pos -= NFSNUMCOOKIES;
  287                 if (LIST_NEXT(dp, ndm_list)) {
  288                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  289                             pos >= dp->ndm_eocookie)
  290                                 goto out;
  291                         dp = LIST_NEXT(dp, ndm_list);
  292                 } else if (add) {
  293                         MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
  294                                 M_NFSDIROFF, M_WAITOK);
  295                         dp2->ndm_eocookie = 0;
  296                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  297                         dp = dp2;
  298                 } else
  299                         goto out;
  300         }
  301         if (pos >= dp->ndm_eocookie) {
  302                 if (add)
  303                         dp->ndm_eocookie = pos + 1;
  304                 else
  305                         goto out;
  306         }
  307         retval = &dp->ndm_cookies[pos];
  308 out:
  309         return (retval);
  310 }
  311 
  312 /*
  313  * Invalidate cached directory information, except for the actual directory
  314  * blocks (which are invalidated separately).
  315  * Done mainly to avoid the use of stale offset cookies.
  316  */
  317 void
  318 ncl_invaldir(struct vnode *vp)
  319 {
  320         struct nfsnode *np = VTONFS(vp);
  321 
  322         KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
  323         ncl_dircookie_lock(np);
  324         np->n_direofoffset = 0;
  325         np->n_cookieverf.nfsuquad[0] = 0;
  326         np->n_cookieverf.nfsuquad[1] = 0;
  327         if (LIST_FIRST(&np->n_cookies))
  328                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  329         ncl_dircookie_unlock(np);
  330 }
  331 
  332 /*
  333  * The write verifier has changed (probably due to a server reboot), so all
  334  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  335  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  336  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  337  * mount point.
  338  *
  339  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  340  * writes are not clusterable.
  341  */
  342 void
  343 ncl_clearcommit(struct mount *mp)
  344 {
  345         struct vnode *vp, *nvp;
  346         struct buf *bp, *nbp;
  347         struct bufobj *bo;
  348 
  349         MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
  350                 bo = &vp->v_bufobj;
  351                 vholdl(vp);
  352                 VI_UNLOCK(vp);
  353                 BO_LOCK(bo);
  354                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  355                         if (!BUF_ISLOCKED(bp) &&
  356                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  357                                 == (B_DELWRI | B_NEEDCOMMIT))
  358                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  359                 }
  360                 BO_UNLOCK(bo);
  361                 vdrop(vp);
  362         }
  363 }
  364 
  365 /*
  366  * Called once to initialize data structures...
  367  */
  368 int
  369 ncl_init(struct vfsconf *vfsp)
  370 {
  371         int i;
  372 
  373         /* Ensure async daemons disabled */
  374         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  375                 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  376                 ncl_iodmount[i] = NULL;
  377         }
  378         TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
  379         ncl_nhinit();                   /* Init the nfsnode table */
  380 
  381         return (0);
  382 }
  383 

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