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/8.0/sys/fs/nfsclient/nfs_clsubs.c 196341 2009-08-17 18:11:50Z 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 
   61 #include <vm/vm.h>
   62 #include <vm/vm_object.h>
   63 #include <vm/vm_extern.h>
   64 #include <vm/uma.h>
   65 
   66 #include <fs/nfs/nfsport.h>
   67 #include <fs/nfsclient/nfsnode.h>
   68 #include <fs/nfsclient/nfsmount.h>
   69 #include <fs/nfsclient/nfs.h>
   70 #include <fs/nfsclient/nfs_lock.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 struct proc *ncl_iodwant[NFS_MAXRAHEAD];
   82 extern struct nfsmount *ncl_iodmount[NFS_MAXRAHEAD];
   83 extern int ncl_numasync;
   84 extern unsigned int ncl_iodmax;
   85 extern struct nfsstats newnfsstats;
   86 
   87 int
   88 ncl_uninit(struct vfsconf *vfsp)
   89 {
   90         int i;
   91 
   92         /*
   93          * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
   94          * any sleeping nfsiods so they check ncl_iodmax and exit.
   95          */
   96         mtx_lock(&ncl_iod_mutex);
   97         ncl_iodmax = 0;
   98         for (i = 0; i < ncl_numasync; i++)
   99                 if (ncl_iodwant[i])
  100                         wakeup(&ncl_iodwant[i]);
  101         /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
  102         while (ncl_numasync)
  103                 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
  104         mtx_unlock(&ncl_iod_mutex);
  105         ncl_nhuninit();
  106         return (0);
  107 }
  108 
  109 void 
  110 ncl_dircookie_lock(struct nfsnode *np)
  111 {
  112         mtx_lock(&np->n_mtx);
  113         while (np->n_flag & NDIRCOOKIELK)
  114                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  115         np->n_flag |= NDIRCOOKIELK;
  116         mtx_unlock(&np->n_mtx);
  117 }
  118 
  119 void 
  120 ncl_dircookie_unlock(struct nfsnode *np)
  121 {
  122         mtx_lock(&np->n_mtx);
  123         np->n_flag &= ~NDIRCOOKIELK;
  124         wakeup(&np->n_flag);
  125         mtx_unlock(&np->n_mtx);
  126 }
  127 
  128 int
  129 ncl_upgrade_vnlock(struct vnode *vp)
  130 {
  131         int old_lock;
  132 
  133         ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock");
  134         old_lock = VOP_ISLOCKED(vp);
  135         if (old_lock != LK_EXCLUSIVE) {
  136                 KASSERT(old_lock == LK_SHARED,
  137                     ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock));
  138                 /* Upgrade to exclusive lock, this might block */
  139                 vn_lock(vp, LK_UPGRADE | LK_RETRY);
  140         }
  141         return (old_lock);
  142 }
  143 
  144 void
  145 ncl_downgrade_vnlock(struct vnode *vp, int old_lock)
  146 {
  147         if (old_lock != LK_EXCLUSIVE) {
  148                 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
  149                 /* Downgrade from exclusive lock. */
  150                 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
  151         }
  152 }
  153 
  154 void
  155 ncl_printf(const char *fmt, ...)
  156 {
  157         va_list ap;
  158 
  159         mtx_lock(&Giant);
  160         va_start(ap, fmt);
  161         printf(fmt, ap);
  162         va_end(ap);
  163         mtx_unlock(&Giant);
  164 }
  165 
  166 #ifdef NFS_ACDEBUG
  167 #include <sys/sysctl.h>
  168 SYSCTL_DECL(_vfs_newnfs);
  169 static int nfs_acdebug;
  170 SYSCTL_INT(_vfs_newnfs, 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;
  185         
  186         np = VTONFS(vp);
  187         vap = &np->n_vattr.na_vattr;
  188         nmp = VFSTONFS(vp->v_mount);
  189 #ifdef NFS_ACDEBUG
  190         mtx_lock(&Giant);       /* ncl_printf() */
  191 #endif
  192         mtx_lock(&np->n_mtx);
  193         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  194         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  195 
  196 #ifdef NFS_ACDEBUG
  197         if (nfs_acdebug>1)
  198                 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
  199 #endif
  200 
  201         if (vap->va_type == VDIR) {
  202                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  203                         timeo = nmp->nm_acdirmin;
  204                 else if (timeo > nmp->nm_acdirmax)
  205                         timeo = nmp->nm_acdirmax;
  206         } else {
  207                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  208                         timeo = nmp->nm_acregmin;
  209                 else if (timeo > nmp->nm_acregmax)
  210                         timeo = nmp->nm_acregmax;
  211         }
  212 
  213 #ifdef NFS_ACDEBUG
  214         if (nfs_acdebug > 2)
  215                 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  216                            nmp->nm_acregmin, nmp->nm_acregmax,
  217                            nmp->nm_acdirmin, nmp->nm_acdirmax);
  218 
  219         if (nfs_acdebug)
  220                 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
  221                            (time_second - np->n_attrstamp), timeo);
  222 #endif
  223 
  224         if ((time_second - np->n_attrstamp) >= timeo) {
  225                 newnfsstats.attrcache_misses++;
  226                 mtx_unlock(&np->n_mtx);
  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 #ifdef NFS_ACDEBUG
  254         mtx_unlock(&Giant);     /* ncl_printf() */
  255 #endif
  256         return (0);
  257 }
  258 
  259 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  260 /*
  261  * This function finds the directory cookie that corresponds to the
  262  * logical byte offset given.
  263  */
  264 nfsuint64 *
  265 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  266 {
  267         struct nfsdmap *dp, *dp2;
  268         int pos;
  269         nfsuint64 *retval = NULL;
  270         
  271         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  272         if (pos == 0 || off < 0) {
  273 #ifdef DIAGNOSTIC
  274                 if (add)
  275                         panic("nfs getcookie add at <= 0");
  276 #endif
  277                 return (&nfs_nullcookie);
  278         }
  279         pos--;
  280         dp = LIST_FIRST(&np->n_cookies);
  281         if (!dp) {
  282                 if (add) {
  283                         MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
  284                                 M_NFSDIROFF, M_WAITOK);
  285                         dp->ndm_eocookie = 0;
  286                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  287                 } else
  288                         goto out;
  289         }
  290         while (pos >= NFSNUMCOOKIES) {
  291                 pos -= NFSNUMCOOKIES;
  292                 if (LIST_NEXT(dp, ndm_list)) {
  293                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  294                             pos >= dp->ndm_eocookie)
  295                                 goto out;
  296                         dp = LIST_NEXT(dp, ndm_list);
  297                 } else if (add) {
  298                         MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
  299                                 M_NFSDIROFF, M_WAITOK);
  300                         dp2->ndm_eocookie = 0;
  301                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  302                         dp = dp2;
  303                 } else
  304                         goto out;
  305         }
  306         if (pos >= dp->ndm_eocookie) {
  307                 if (add)
  308                         dp->ndm_eocookie = pos + 1;
  309                 else
  310                         goto out;
  311         }
  312         retval = &dp->ndm_cookies[pos];
  313 out:
  314         return (retval);
  315 }
  316 
  317 /*
  318  * Invalidate cached directory information, except for the actual directory
  319  * blocks (which are invalidated separately).
  320  * Done mainly to avoid the use of stale offset cookies.
  321  */
  322 void
  323 ncl_invaldir(struct vnode *vp)
  324 {
  325         struct nfsnode *np = VTONFS(vp);
  326 
  327 #ifdef DIAGNOSTIC
  328         if (vp->v_type != VDIR)
  329                 panic("nfs: invaldir not dir");
  330 #endif
  331         ncl_dircookie_lock(np);
  332         np->n_direofoffset = 0;
  333         np->n_cookieverf.nfsuquad[0] = 0;
  334         np->n_cookieverf.nfsuquad[1] = 0;
  335         if (LIST_FIRST(&np->n_cookies))
  336                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  337         ncl_dircookie_unlock(np);
  338 }
  339 
  340 /*
  341  * The write verifier has changed (probably due to a server reboot), so all
  342  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  343  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  344  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  345  * mount point.
  346  *
  347  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  348  * writes are not clusterable.
  349  */
  350 void
  351 ncl_clearcommit(struct mount *mp)
  352 {
  353         struct vnode *vp, *nvp;
  354         struct buf *bp, *nbp;
  355         struct bufobj *bo;
  356 
  357         MNT_ILOCK(mp);
  358         MNT_VNODE_FOREACH(vp, mp, nvp) {
  359                 bo = &vp->v_bufobj;
  360                 VI_LOCK(vp);
  361                 if (vp->v_iflag & VI_DOOMED) {
  362                         VI_UNLOCK(vp);
  363                         continue;
  364                 }
  365                 vholdl(vp);
  366                 VI_UNLOCK(vp);
  367                 MNT_IUNLOCK(mp);
  368                 BO_LOCK(bo);
  369                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  370                         if (!BUF_ISLOCKED(bp) &&
  371                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  372                                 == (B_DELWRI | B_NEEDCOMMIT))
  373                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  374                 }
  375                 BO_UNLOCK(bo);
  376                 vdrop(vp);
  377                 MNT_ILOCK(mp);
  378         }
  379         MNT_IUNLOCK(mp);
  380 }
  381 
  382 /*
  383  * Called once to initialize data structures...
  384  */
  385 int
  386 ncl_init(struct vfsconf *vfsp)
  387 {
  388         int i;
  389 
  390         /* Ensure async daemons disabled */
  391         for (i = 0; i < NFS_MAXRAHEAD; i++) {
  392                 ncl_iodwant[i] = NULL;
  393                 ncl_iodmount[i] = NULL;
  394         }
  395         ncl_nhinit();                   /* Init the nfsnode table */
  396 
  397         return (0);
  398 }
  399 

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