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/8/sys/fs/nfsclient/nfs_clsubs.c 224849 2011-08-13 17:19:24Z zack $");
   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 
   72 #include <netinet/in.h>
   73 
   74 /*
   75  * Note that stdarg.h and the ANSI style va_start macro is used for both
   76  * ANSI and traditional C compilers.
   77  */
   78 #include <machine/stdarg.h>
   79 
   80 extern struct mtx ncl_iod_mutex;
   81 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON];
   82 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON];
   83 extern int ncl_numasync;
   84 extern unsigned int ncl_iodmax;
   85 extern struct nfsstats newnfsstats;
   86 
   87 struct task     ncl_nfsiodnew_task;
   88 
   89 int
   90 ncl_uninit(struct vfsconf *vfsp)
   91 {
   92         /*
   93          * XXX: Unloading of nfscl module is unsupported.
   94          */
   95 #if 0
   96         int i;
   97 
   98         /*
   99          * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
  100          * any sleeping nfsiods so they check ncl_iodmax and exit.
  101          */
  102         mtx_lock(&ncl_iod_mutex);
  103         ncl_iodmax = 0;
  104         for (i = 0; i < ncl_numasync; i++)
  105                 if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
  106                         wakeup(&ncl_iodwant[i]);
  107         /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
  108         while (ncl_numasync)
  109                 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
  110         mtx_unlock(&ncl_iod_mutex);
  111         ncl_nhuninit();
  112         return (0);
  113 #else
  114         return (EOPNOTSUPP);
  115 #endif
  116 }
  117 
  118 void 
  119 ncl_dircookie_lock(struct nfsnode *np)
  120 {
  121         mtx_lock(&np->n_mtx);
  122         while (np->n_flag & NDIRCOOKIELK)
  123                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  124         np->n_flag |= NDIRCOOKIELK;
  125         mtx_unlock(&np->n_mtx);
  126 }
  127 
  128 void 
  129 ncl_dircookie_unlock(struct nfsnode *np)
  130 {
  131         mtx_lock(&np->n_mtx);
  132         np->n_flag &= ~NDIRCOOKIELK;
  133         wakeup(&np->n_flag);
  134         mtx_unlock(&np->n_mtx);
  135 }
  136 
  137 int
  138 ncl_upgrade_vnlock(struct vnode *vp)
  139 {
  140         int old_lock;
  141 
  142         ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock");
  143         old_lock = NFSVOPISLOCKED(vp);
  144         if (old_lock != LK_EXCLUSIVE) {
  145                 KASSERT(old_lock == LK_SHARED,
  146                     ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock));
  147                 /* Upgrade to exclusive lock, this might block */
  148                 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
  149         }
  150         return (old_lock);
  151 }
  152 
  153 void
  154 ncl_downgrade_vnlock(struct vnode *vp, int old_lock)
  155 {
  156         if (old_lock != LK_EXCLUSIVE) {
  157                 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
  158                 /* Downgrade from exclusive lock. */
  159                 NFSVOPLOCK(vp, LK_DOWNGRADE | LK_RETRY);
  160         }
  161 }
  162 
  163 void
  164 ncl_printf(const char *fmt, ...)
  165 {
  166         va_list ap;
  167 
  168         mtx_lock(&Giant);
  169         va_start(ap, fmt);
  170         vprintf(fmt, ap);
  171         va_end(ap);
  172         mtx_unlock(&Giant);
  173 }
  174 
  175 #ifdef NFS_ACDEBUG
  176 #include <sys/sysctl.h>
  177 SYSCTL_DECL(_vfs_newnfs);
  178 static int nfs_acdebug;
  179 SYSCTL_INT(_vfs_newnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  180 #endif
  181 
  182 /*
  183  * Check the time stamp
  184  * If the cache is valid, copy contents to *vap and return 0
  185  * otherwise return an error
  186  */
  187 int
  188 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
  189 {
  190         struct nfsnode *np;
  191         struct vattr *vap;
  192         struct nfsmount *nmp;
  193         int timeo, mustflush;
  194         
  195         np = VTONFS(vp);
  196         vap = &np->n_vattr.na_vattr;
  197         nmp = VFSTONFS(vp->v_mount);
  198         mustflush = nfscl_mustflush(vp);        /* must be before mtx_lock() */
  199 #ifdef NFS_ACDEBUG
  200         mtx_lock(&Giant);       /* ncl_printf() */
  201 #endif
  202         mtx_lock(&np->n_mtx);
  203         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  204         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  205 
  206 #ifdef NFS_ACDEBUG
  207         if (nfs_acdebug>1)
  208                 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
  209 #endif
  210 
  211         if (vap->va_type == VDIR) {
  212                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  213                         timeo = nmp->nm_acdirmin;
  214                 else if (timeo > nmp->nm_acdirmax)
  215                         timeo = nmp->nm_acdirmax;
  216         } else {
  217                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  218                         timeo = nmp->nm_acregmin;
  219                 else if (timeo > nmp->nm_acregmax)
  220                         timeo = nmp->nm_acregmax;
  221         }
  222 
  223 #ifdef NFS_ACDEBUG
  224         if (nfs_acdebug > 2)
  225                 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  226                            nmp->nm_acregmin, nmp->nm_acregmax,
  227                            nmp->nm_acdirmin, nmp->nm_acdirmax);
  228 
  229         if (nfs_acdebug)
  230                 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
  231                            (time_second - np->n_attrstamp), timeo);
  232 #endif
  233 
  234         if ((time_second - np->n_attrstamp) >= timeo &&
  235             (mustflush != 0 || np->n_attrstamp == 0)) {
  236                 newnfsstats.attrcache_misses++;
  237                 mtx_unlock(&np->n_mtx);
  238 #ifdef NFS_ACDEBUG
  239                 mtx_unlock(&Giant);     /* ncl_printf() */
  240 #endif
  241                 return( ENOENT);
  242         }
  243         newnfsstats.attrcache_hits++;
  244         if (vap->va_size != np->n_size) {
  245                 if (vap->va_type == VREG) {
  246                         if (np->n_flag & NMODIFIED) {
  247                                 if (vap->va_size < np->n_size)
  248                                         vap->va_size = np->n_size;
  249                                 else
  250                                         np->n_size = vap->va_size;
  251                         } else {
  252                                 np->n_size = vap->va_size;
  253                         }
  254                         vnode_pager_setsize(vp, np->n_size);
  255                 } else {
  256                         np->n_size = vap->va_size;
  257                 }
  258         }
  259         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  260         if (np->n_flag & NCHG) {
  261                 if (np->n_flag & NACC)
  262                         vaper->va_atime = np->n_atim;
  263                 if (np->n_flag & NUPD)
  264                         vaper->va_mtime = np->n_mtim;
  265         }
  266         mtx_unlock(&np->n_mtx);
  267 #ifdef NFS_ACDEBUG
  268         mtx_unlock(&Giant);     /* ncl_printf() */
  269 #endif
  270         return (0);
  271 }
  272 
  273 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  274 /*
  275  * This function finds the directory cookie that corresponds to the
  276  * logical byte offset given.
  277  */
  278 nfsuint64 *
  279 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  280 {
  281         struct nfsdmap *dp, *dp2;
  282         int pos;
  283         nfsuint64 *retval = NULL;
  284         
  285         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  286         if (pos == 0 || off < 0) {
  287                 KASSERT(!add, ("nfs getcookie add at <= 0"));
  288                 return (&nfs_nullcookie);
  289         }
  290         pos--;
  291         dp = LIST_FIRST(&np->n_cookies);
  292         if (!dp) {
  293                 if (add) {
  294                         MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
  295                                 M_NFSDIROFF, M_WAITOK);
  296                         dp->ndm_eocookie = 0;
  297                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  298                 } else
  299                         goto out;
  300         }
  301         while (pos >= NFSNUMCOOKIES) {
  302                 pos -= NFSNUMCOOKIES;
  303                 if (LIST_NEXT(dp, ndm_list)) {
  304                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  305                             pos >= dp->ndm_eocookie)
  306                                 goto out;
  307                         dp = LIST_NEXT(dp, ndm_list);
  308                 } else if (add) {
  309                         MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
  310                                 M_NFSDIROFF, M_WAITOK);
  311                         dp2->ndm_eocookie = 0;
  312                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  313                         dp = dp2;
  314                 } else
  315                         goto out;
  316         }
  317         if (pos >= dp->ndm_eocookie) {
  318                 if (add)
  319                         dp->ndm_eocookie = pos + 1;
  320                 else
  321                         goto out;
  322         }
  323         retval = &dp->ndm_cookies[pos];
  324 out:
  325         return (retval);
  326 }
  327 
  328 /*
  329  * Invalidate cached directory information, except for the actual directory
  330  * blocks (which are invalidated separately).
  331  * Done mainly to avoid the use of stale offset cookies.
  332  */
  333 void
  334 ncl_invaldir(struct vnode *vp)
  335 {
  336         struct nfsnode *np = VTONFS(vp);
  337 
  338         KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
  339         ncl_dircookie_lock(np);
  340         np->n_direofoffset = 0;
  341         np->n_cookieverf.nfsuquad[0] = 0;
  342         np->n_cookieverf.nfsuquad[1] = 0;
  343         if (LIST_FIRST(&np->n_cookies))
  344                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  345         ncl_dircookie_unlock(np);
  346 }
  347 
  348 /*
  349  * The write verifier has changed (probably due to a server reboot), so all
  350  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  351  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  352  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  353  * mount point.
  354  *
  355  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  356  * writes are not clusterable.
  357  */
  358 void
  359 ncl_clearcommit(struct mount *mp)
  360 {
  361         struct vnode *vp, *nvp;
  362         struct buf *bp, *nbp;
  363         struct bufobj *bo;
  364 
  365         MNT_ILOCK(mp);
  366         MNT_VNODE_FOREACH(vp, mp, nvp) {
  367                 bo = &vp->v_bufobj;
  368                 VI_LOCK(vp);
  369                 if (vp->v_iflag & VI_DOOMED) {
  370                         VI_UNLOCK(vp);
  371                         continue;
  372                 }
  373                 vholdl(vp);
  374                 VI_UNLOCK(vp);
  375                 MNT_IUNLOCK(mp);
  376                 BO_LOCK(bo);
  377                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  378                         if (!BUF_ISLOCKED(bp) &&
  379                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  380                                 == (B_DELWRI | B_NEEDCOMMIT))
  381                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  382                 }
  383                 BO_UNLOCK(bo);
  384                 vdrop(vp);
  385                 MNT_ILOCK(mp);
  386         }
  387         MNT_IUNLOCK(mp);
  388 }
  389 
  390 /*
  391  * Called once to initialize data structures...
  392  */
  393 int
  394 ncl_init(struct vfsconf *vfsp)
  395 {
  396         int i;
  397 
  398         /* Ensure async daemons disabled */
  399         for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
  400                 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  401                 ncl_iodmount[i] = NULL;
  402         }
  403         TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
  404         ncl_nhinit();                   /* Init the nfsnode table */
  405 
  406         return (0);
  407 }
  408 

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