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/8.1/sys/fs/nfsclient/nfs_clsubs.c 208432 2010-05-23 02:55:59Z 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 enum nfsiod_state 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         /*
   91          * XXX: Unloading of nfscl module is unsupported.
   92          */
   93 #if 0
   94         int i;
   95 
   96         /*
   97          * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
   98          * any sleeping nfsiods so they check ncl_iodmax and exit.
   99          */
  100         mtx_lock(&ncl_iod_mutex);
  101         ncl_iodmax = 0;
  102         for (i = 0; i < ncl_numasync; i++)
  103                 if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
  104                         wakeup(&ncl_iodwant[i]);
  105         /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
  106         while (ncl_numasync)
  107                 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
  108         mtx_unlock(&ncl_iod_mutex);
  109         ncl_nhuninit();
  110         return (0);
  111 #else
  112         return (EOPNOTSUPP);
  113 #endif
  114 }
  115 
  116 void 
  117 ncl_dircookie_lock(struct nfsnode *np)
  118 {
  119         mtx_lock(&np->n_mtx);
  120         while (np->n_flag & NDIRCOOKIELK)
  121                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  122         np->n_flag |= NDIRCOOKIELK;
  123         mtx_unlock(&np->n_mtx);
  124 }
  125 
  126 void 
  127 ncl_dircookie_unlock(struct nfsnode *np)
  128 {
  129         mtx_lock(&np->n_mtx);
  130         np->n_flag &= ~NDIRCOOKIELK;
  131         wakeup(&np->n_flag);
  132         mtx_unlock(&np->n_mtx);
  133 }
  134 
  135 int
  136 ncl_upgrade_vnlock(struct vnode *vp)
  137 {
  138         int old_lock;
  139 
  140         ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock");
  141         old_lock = VOP_ISLOCKED(vp);
  142         if (old_lock != LK_EXCLUSIVE) {
  143                 KASSERT(old_lock == LK_SHARED,
  144                     ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock));
  145                 /* Upgrade to exclusive lock, this might block */
  146                 vn_lock(vp, LK_UPGRADE | LK_RETRY);
  147         }
  148         return (old_lock);
  149 }
  150 
  151 void
  152 ncl_downgrade_vnlock(struct vnode *vp, int old_lock)
  153 {
  154         if (old_lock != LK_EXCLUSIVE) {
  155                 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
  156                 /* Downgrade from exclusive lock. */
  157                 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
  158         }
  159 }
  160 
  161 void
  162 ncl_printf(const char *fmt, ...)
  163 {
  164         va_list ap;
  165 
  166         mtx_lock(&Giant);
  167         va_start(ap, fmt);
  168         printf(fmt, ap);
  169         va_end(ap);
  170         mtx_unlock(&Giant);
  171 }
  172 
  173 #ifdef NFS_ACDEBUG
  174 #include <sys/sysctl.h>
  175 SYSCTL_DECL(_vfs_newnfs);
  176 static int nfs_acdebug;
  177 SYSCTL_INT(_vfs_newnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  178 #endif
  179 
  180 /*
  181  * Check the time stamp
  182  * If the cache is valid, copy contents to *vap and return 0
  183  * otherwise return an error
  184  */
  185 int
  186 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
  187 {
  188         struct nfsnode *np;
  189         struct vattr *vap;
  190         struct nfsmount *nmp;
  191         int timeo, mustflush;
  192         
  193         np = VTONFS(vp);
  194         vap = &np->n_vattr.na_vattr;
  195         nmp = VFSTONFS(vp->v_mount);
  196         mustflush = nfscl_mustflush(vp);        /* must be before mtx_lock() */
  197 #ifdef NFS_ACDEBUG
  198         mtx_lock(&Giant);       /* ncl_printf() */
  199 #endif
  200         mtx_lock(&np->n_mtx);
  201         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  202         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  203 
  204 #ifdef NFS_ACDEBUG
  205         if (nfs_acdebug>1)
  206                 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
  207 #endif
  208 
  209         if (vap->va_type == VDIR) {
  210                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  211                         timeo = nmp->nm_acdirmin;
  212                 else if (timeo > nmp->nm_acdirmax)
  213                         timeo = nmp->nm_acdirmax;
  214         } else {
  215                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  216                         timeo = nmp->nm_acregmin;
  217                 else if (timeo > nmp->nm_acregmax)
  218                         timeo = nmp->nm_acregmax;
  219         }
  220 
  221 #ifdef NFS_ACDEBUG
  222         if (nfs_acdebug > 2)
  223                 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  224                            nmp->nm_acregmin, nmp->nm_acregmax,
  225                            nmp->nm_acdirmin, nmp->nm_acdirmax);
  226 
  227         if (nfs_acdebug)
  228                 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
  229                            (time_second - np->n_attrstamp), timeo);
  230 #endif
  231 
  232         if ((time_second - np->n_attrstamp) >= timeo &&
  233             mustflush != 0) {
  234                 newnfsstats.attrcache_misses++;
  235                 mtx_unlock(&np->n_mtx);
  236 #ifdef NFS_ACDEBUG
  237                 mtx_unlock(&Giant);     /* ncl_printf() */
  238 #endif
  239                 return( ENOENT);
  240         }
  241         newnfsstats.attrcache_hits++;
  242         if (vap->va_size != np->n_size) {
  243                 if (vap->va_type == VREG) {
  244                         if (np->n_flag & NMODIFIED) {
  245                                 if (vap->va_size < np->n_size)
  246                                         vap->va_size = np->n_size;
  247                                 else
  248                                         np->n_size = vap->va_size;
  249                         } else {
  250                                 np->n_size = vap->va_size;
  251                         }
  252                         vnode_pager_setsize(vp, np->n_size);
  253                 } else {
  254                         np->n_size = vap->va_size;
  255                 }
  256         }
  257         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  258         if (np->n_flag & NCHG) {
  259                 if (np->n_flag & NACC)
  260                         vaper->va_atime = np->n_atim;
  261                 if (np->n_flag & NUPD)
  262                         vaper->va_mtime = np->n_mtim;
  263         }
  264         mtx_unlock(&np->n_mtx);
  265 #ifdef NFS_ACDEBUG
  266         mtx_unlock(&Giant);     /* ncl_printf() */
  267 #endif
  268         return (0);
  269 }
  270 
  271 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  272 /*
  273  * This function finds the directory cookie that corresponds to the
  274  * logical byte offset given.
  275  */
  276 nfsuint64 *
  277 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  278 {
  279         struct nfsdmap *dp, *dp2;
  280         int pos;
  281         nfsuint64 *retval = NULL;
  282         
  283         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  284         if (pos == 0 || off < 0) {
  285 #ifdef DIAGNOSTIC
  286                 if (add)
  287                         panic("nfs getcookie add at <= 0");
  288 #endif
  289                 return (&nfs_nullcookie);
  290         }
  291         pos--;
  292         dp = LIST_FIRST(&np->n_cookies);
  293         if (!dp) {
  294                 if (add) {
  295                         MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
  296                                 M_NFSDIROFF, M_WAITOK);
  297                         dp->ndm_eocookie = 0;
  298                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  299                 } else
  300                         goto out;
  301         }
  302         while (pos >= NFSNUMCOOKIES) {
  303                 pos -= NFSNUMCOOKIES;
  304                 if (LIST_NEXT(dp, ndm_list)) {
  305                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  306                             pos >= dp->ndm_eocookie)
  307                                 goto out;
  308                         dp = LIST_NEXT(dp, ndm_list);
  309                 } else if (add) {
  310                         MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
  311                                 M_NFSDIROFF, M_WAITOK);
  312                         dp2->ndm_eocookie = 0;
  313                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  314                         dp = dp2;
  315                 } else
  316                         goto out;
  317         }
  318         if (pos >= dp->ndm_eocookie) {
  319                 if (add)
  320                         dp->ndm_eocookie = pos + 1;
  321                 else
  322                         goto out;
  323         }
  324         retval = &dp->ndm_cookies[pos];
  325 out:
  326         return (retval);
  327 }
  328 
  329 /*
  330  * Invalidate cached directory information, except for the actual directory
  331  * blocks (which are invalidated separately).
  332  * Done mainly to avoid the use of stale offset cookies.
  333  */
  334 void
  335 ncl_invaldir(struct vnode *vp)
  336 {
  337         struct nfsnode *np = VTONFS(vp);
  338 
  339 #ifdef DIAGNOSTIC
  340         if (vp->v_type != VDIR)
  341                 panic("nfs: invaldir not dir");
  342 #endif
  343         ncl_dircookie_lock(np);
  344         np->n_direofoffset = 0;
  345         np->n_cookieverf.nfsuquad[0] = 0;
  346         np->n_cookieverf.nfsuquad[1] = 0;
  347         if (LIST_FIRST(&np->n_cookies))
  348                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  349         ncl_dircookie_unlock(np);
  350 }
  351 
  352 /*
  353  * The write verifier has changed (probably due to a server reboot), so all
  354  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  355  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  356  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  357  * mount point.
  358  *
  359  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  360  * writes are not clusterable.
  361  */
  362 void
  363 ncl_clearcommit(struct mount *mp)
  364 {
  365         struct vnode *vp, *nvp;
  366         struct buf *bp, *nbp;
  367         struct bufobj *bo;
  368 
  369         MNT_ILOCK(mp);
  370         MNT_VNODE_FOREACH(vp, mp, nvp) {
  371                 bo = &vp->v_bufobj;
  372                 VI_LOCK(vp);
  373                 if (vp->v_iflag & VI_DOOMED) {
  374                         VI_UNLOCK(vp);
  375                         continue;
  376                 }
  377                 vholdl(vp);
  378                 VI_UNLOCK(vp);
  379                 MNT_IUNLOCK(mp);
  380                 BO_LOCK(bo);
  381                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  382                         if (!BUF_ISLOCKED(bp) &&
  383                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  384                                 == (B_DELWRI | B_NEEDCOMMIT))
  385                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  386                 }
  387                 BO_UNLOCK(bo);
  388                 vdrop(vp);
  389                 MNT_ILOCK(mp);
  390         }
  391         MNT_IUNLOCK(mp);
  392 }
  393 
  394 /*
  395  * Called once to initialize data structures...
  396  */
  397 int
  398 ncl_init(struct vfsconf *vfsp)
  399 {
  400         int i;
  401 
  402         /* Ensure async daemons disabled */
  403         for (i = 0; i < NFS_MAXRAHEAD; i++) {
  404                 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  405                 ncl_iodmount[i] = NULL;
  406         }
  407         ncl_nhinit();                   /* Init the nfsnode table */
  408 
  409         return (0);
  410 }
  411 

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