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/10.2/sys/fs/nfsclient/nfs_clsubs.c 234386 2012-04-17 16:28:22Z mckusick $");
   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 void
  167 ncl_printf(const char *fmt, ...)
  168 {
  169         va_list ap;
  170 
  171         mtx_lock(&Giant);
  172         va_start(ap, fmt);
  173         vprintf(fmt, ap);
  174         va_end(ap);
  175         mtx_unlock(&Giant);
  176 }
  177 
  178 #ifdef NFS_ACDEBUG
  179 #include <sys/sysctl.h>
  180 SYSCTL_DECL(_vfs_nfs);
  181 static int nfs_acdebug;
  182 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  183 #endif
  184 
  185 /*
  186  * Check the time stamp
  187  * If the cache is valid, copy contents to *vap and return 0
  188  * otherwise return an error
  189  */
  190 int
  191 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
  192 {
  193         struct nfsnode *np;
  194         struct vattr *vap;
  195         struct nfsmount *nmp;
  196         int timeo, mustflush;
  197         
  198         np = VTONFS(vp);
  199         vap = &np->n_vattr.na_vattr;
  200         nmp = VFSTONFS(vp->v_mount);
  201         mustflush = nfscl_mustflush(vp);        /* must be before mtx_lock() */
  202 #ifdef NFS_ACDEBUG
  203         mtx_lock(&Giant);       /* ncl_printf() */
  204 #endif
  205         mtx_lock(&np->n_mtx);
  206         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  207         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  208 
  209 #ifdef NFS_ACDEBUG
  210         if (nfs_acdebug>1)
  211                 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
  212 #endif
  213 
  214         if (vap->va_type == VDIR) {
  215                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  216                         timeo = nmp->nm_acdirmin;
  217                 else if (timeo > nmp->nm_acdirmax)
  218                         timeo = nmp->nm_acdirmax;
  219         } else {
  220                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  221                         timeo = nmp->nm_acregmin;
  222                 else if (timeo > nmp->nm_acregmax)
  223                         timeo = nmp->nm_acregmax;
  224         }
  225 
  226 #ifdef NFS_ACDEBUG
  227         if (nfs_acdebug > 2)
  228                 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  229                            nmp->nm_acregmin, nmp->nm_acregmax,
  230                            nmp->nm_acdirmin, nmp->nm_acdirmax);
  231 
  232         if (nfs_acdebug)
  233                 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
  234                            (time_second - np->n_attrstamp), timeo);
  235 #endif
  236 
  237         if ((time_second - np->n_attrstamp) >= timeo &&
  238             (mustflush != 0 || np->n_attrstamp == 0)) {
  239                 newnfsstats.attrcache_misses++;
  240                 mtx_unlock(&np->n_mtx);
  241 #ifdef NFS_ACDEBUG
  242                 mtx_unlock(&Giant);     /* ncl_printf() */
  243 #endif
  244                 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
  245                 return( ENOENT);
  246         }
  247         newnfsstats.attrcache_hits++;
  248         if (vap->va_size != np->n_size) {
  249                 if (vap->va_type == VREG) {
  250                         if (np->n_flag & NMODIFIED) {
  251                                 if (vap->va_size < np->n_size)
  252                                         vap->va_size = np->n_size;
  253                                 else
  254                                         np->n_size = vap->va_size;
  255                         } else {
  256                                 np->n_size = vap->va_size;
  257                         }
  258                         vnode_pager_setsize(vp, np->n_size);
  259                 } else {
  260                         np->n_size = vap->va_size;
  261                 }
  262         }
  263         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  264         if (np->n_flag & NCHG) {
  265                 if (np->n_flag & NACC)
  266                         vaper->va_atime = np->n_atim;
  267                 if (np->n_flag & NUPD)
  268                         vaper->va_mtime = np->n_mtim;
  269         }
  270         mtx_unlock(&np->n_mtx);
  271 #ifdef NFS_ACDEBUG
  272         mtx_unlock(&Giant);     /* ncl_printf() */
  273 #endif
  274         KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
  275         return (0);
  276 }
  277 
  278 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  279 /*
  280  * This function finds the directory cookie that corresponds to the
  281  * logical byte offset given.
  282  */
  283 nfsuint64 *
  284 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  285 {
  286         struct nfsdmap *dp, *dp2;
  287         int pos;
  288         nfsuint64 *retval = NULL;
  289         
  290         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  291         if (pos == 0 || off < 0) {
  292                 KASSERT(!add, ("nfs getcookie add at <= 0"));
  293                 return (&nfs_nullcookie);
  294         }
  295         pos--;
  296         dp = LIST_FIRST(&np->n_cookies);
  297         if (!dp) {
  298                 if (add) {
  299                         MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
  300                                 M_NFSDIROFF, M_WAITOK);
  301                         dp->ndm_eocookie = 0;
  302                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  303                 } else
  304                         goto out;
  305         }
  306         while (pos >= NFSNUMCOOKIES) {
  307                 pos -= NFSNUMCOOKIES;
  308                 if (LIST_NEXT(dp, ndm_list)) {
  309                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  310                             pos >= dp->ndm_eocookie)
  311                                 goto out;
  312                         dp = LIST_NEXT(dp, ndm_list);
  313                 } else if (add) {
  314                         MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
  315                                 M_NFSDIROFF, M_WAITOK);
  316                         dp2->ndm_eocookie = 0;
  317                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  318                         dp = dp2;
  319                 } else
  320                         goto out;
  321         }
  322         if (pos >= dp->ndm_eocookie) {
  323                 if (add)
  324                         dp->ndm_eocookie = pos + 1;
  325                 else
  326                         goto out;
  327         }
  328         retval = &dp->ndm_cookies[pos];
  329 out:
  330         return (retval);
  331 }
  332 
  333 /*
  334  * Invalidate cached directory information, except for the actual directory
  335  * blocks (which are invalidated separately).
  336  * Done mainly to avoid the use of stale offset cookies.
  337  */
  338 void
  339 ncl_invaldir(struct vnode *vp)
  340 {
  341         struct nfsnode *np = VTONFS(vp);
  342 
  343         KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
  344         ncl_dircookie_lock(np);
  345         np->n_direofoffset = 0;
  346         np->n_cookieverf.nfsuquad[0] = 0;
  347         np->n_cookieverf.nfsuquad[1] = 0;
  348         if (LIST_FIRST(&np->n_cookies))
  349                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  350         ncl_dircookie_unlock(np);
  351 }
  352 
  353 /*
  354  * The write verifier has changed (probably due to a server reboot), so all
  355  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  356  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  357  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  358  * mount point.
  359  *
  360  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  361  * writes are not clusterable.
  362  */
  363 void
  364 ncl_clearcommit(struct mount *mp)
  365 {
  366         struct vnode *vp, *nvp;
  367         struct buf *bp, *nbp;
  368         struct bufobj *bo;
  369 
  370         MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
  371                 bo = &vp->v_bufobj;
  372                 vholdl(vp);
  373                 VI_UNLOCK(vp);
  374                 BO_LOCK(bo);
  375                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  376                         if (!BUF_ISLOCKED(bp) &&
  377                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  378                                 == (B_DELWRI | B_NEEDCOMMIT))
  379                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  380                 }
  381                 BO_UNLOCK(bo);
  382                 vdrop(vp);
  383         }
  384 }
  385 
  386 /*
  387  * Called once to initialize data structures...
  388  */
  389 int
  390 ncl_init(struct vfsconf *vfsp)
  391 {
  392         int i;
  393 
  394         /* Ensure async daemons disabled */
  395         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  396                 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  397                 ncl_iodmount[i] = NULL;
  398         }
  399         TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
  400         ncl_nhinit();                   /* Init the nfsnode table */
  401 
  402         return (0);
  403 }
  404 

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