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/8.2/sys/fs/nfsclient/nfs_clsubs.c 211160 2010-08-11 03:08:03Z 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 
   71 #include <netinet/in.h>
   72 
   73 /*
   74  * Note that stdarg.h and the ANSI style va_start macro is used for both
   75  * ANSI and traditional C compilers.
   76  */
   77 #include <machine/stdarg.h>
   78 
   79 extern struct mtx ncl_iod_mutex;
   80 extern enum nfsiod_state ncl_iodwant[NFS_MAXRAHEAD];
   81 extern struct nfsmount *ncl_iodmount[NFS_MAXRAHEAD];
   82 extern int ncl_numasync;
   83 extern unsigned int ncl_iodmax;
   84 extern struct nfsstats newnfsstats;
   85 
   86 int
   87 ncl_uninit(struct vfsconf *vfsp)
   88 {
   89         /*
   90          * XXX: Unloading of nfscl module is unsupported.
   91          */
   92 #if 0
   93         int i;
   94 
   95         /*
   96          * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
   97          * any sleeping nfsiods so they check ncl_iodmax and exit.
   98          */
   99         mtx_lock(&ncl_iod_mutex);
  100         ncl_iodmax = 0;
  101         for (i = 0; i < ncl_numasync; i++)
  102                 if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
  103                         wakeup(&ncl_iodwant[i]);
  104         /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
  105         while (ncl_numasync)
  106                 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
  107         mtx_unlock(&ncl_iod_mutex);
  108         ncl_nhuninit();
  109         return (0);
  110 #else
  111         return (EOPNOTSUPP);
  112 #endif
  113 }
  114 
  115 void 
  116 ncl_dircookie_lock(struct nfsnode *np)
  117 {
  118         mtx_lock(&np->n_mtx);
  119         while (np->n_flag & NDIRCOOKIELK)
  120                 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
  121         np->n_flag |= NDIRCOOKIELK;
  122         mtx_unlock(&np->n_mtx);
  123 }
  124 
  125 void 
  126 ncl_dircookie_unlock(struct nfsnode *np)
  127 {
  128         mtx_lock(&np->n_mtx);
  129         np->n_flag &= ~NDIRCOOKIELK;
  130         wakeup(&np->n_flag);
  131         mtx_unlock(&np->n_mtx);
  132 }
  133 
  134 int
  135 ncl_upgrade_vnlock(struct vnode *vp)
  136 {
  137         int old_lock;
  138 
  139         ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock");
  140         old_lock = VOP_ISLOCKED(vp);
  141         if (old_lock != LK_EXCLUSIVE) {
  142                 KASSERT(old_lock == LK_SHARED,
  143                     ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock));
  144                 /* Upgrade to exclusive lock, this might block */
  145                 vn_lock(vp, LK_UPGRADE | LK_RETRY);
  146         }
  147         return (old_lock);
  148 }
  149 
  150 void
  151 ncl_downgrade_vnlock(struct vnode *vp, int old_lock)
  152 {
  153         if (old_lock != LK_EXCLUSIVE) {
  154                 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
  155                 /* Downgrade from exclusive lock. */
  156                 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
  157         }
  158 }
  159 
  160 void
  161 ncl_printf(const char *fmt, ...)
  162 {
  163         va_list ap;
  164 
  165         mtx_lock(&Giant);
  166         va_start(ap, fmt);
  167         printf(fmt, ap);
  168         va_end(ap);
  169         mtx_unlock(&Giant);
  170 }
  171 
  172 #ifdef NFS_ACDEBUG
  173 #include <sys/sysctl.h>
  174 SYSCTL_DECL(_vfs_newnfs);
  175 static int nfs_acdebug;
  176 SYSCTL_INT(_vfs_newnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
  177 #endif
  178 
  179 /*
  180  * Check the time stamp
  181  * If the cache is valid, copy contents to *vap and return 0
  182  * otherwise return an error
  183  */
  184 int
  185 ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
  186 {
  187         struct nfsnode *np;
  188         struct vattr *vap;
  189         struct nfsmount *nmp;
  190         int timeo, mustflush;
  191         
  192         np = VTONFS(vp);
  193         vap = &np->n_vattr.na_vattr;
  194         nmp = VFSTONFS(vp->v_mount);
  195         mustflush = nfscl_mustflush(vp);        /* must be before mtx_lock() */
  196 #ifdef NFS_ACDEBUG
  197         mtx_lock(&Giant);       /* ncl_printf() */
  198 #endif
  199         mtx_lock(&np->n_mtx);
  200         /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
  201         timeo = (time_second - np->n_mtime.tv_sec) / 10;
  202 
  203 #ifdef NFS_ACDEBUG
  204         if (nfs_acdebug>1)
  205                 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
  206 #endif
  207 
  208         if (vap->va_type == VDIR) {
  209                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
  210                         timeo = nmp->nm_acdirmin;
  211                 else if (timeo > nmp->nm_acdirmax)
  212                         timeo = nmp->nm_acdirmax;
  213         } else {
  214                 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
  215                         timeo = nmp->nm_acregmin;
  216                 else if (timeo > nmp->nm_acregmax)
  217                         timeo = nmp->nm_acregmax;
  218         }
  219 
  220 #ifdef NFS_ACDEBUG
  221         if (nfs_acdebug > 2)
  222                 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
  223                            nmp->nm_acregmin, nmp->nm_acregmax,
  224                            nmp->nm_acdirmin, nmp->nm_acdirmax);
  225 
  226         if (nfs_acdebug)
  227                 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
  228                            (time_second - np->n_attrstamp), timeo);
  229 #endif
  230 
  231         if ((time_second - np->n_attrstamp) >= timeo &&
  232             (mustflush != 0 || np->n_attrstamp == 0)) {
  233                 newnfsstats.attrcache_misses++;
  234                 mtx_unlock(&np->n_mtx);
  235 #ifdef NFS_ACDEBUG
  236                 mtx_unlock(&Giant);     /* ncl_printf() */
  237 #endif
  238                 return( ENOENT);
  239         }
  240         newnfsstats.attrcache_hits++;
  241         if (vap->va_size != np->n_size) {
  242                 if (vap->va_type == VREG) {
  243                         if (np->n_flag & NMODIFIED) {
  244                                 if (vap->va_size < np->n_size)
  245                                         vap->va_size = np->n_size;
  246                                 else
  247                                         np->n_size = vap->va_size;
  248                         } else {
  249                                 np->n_size = vap->va_size;
  250                         }
  251                         vnode_pager_setsize(vp, np->n_size);
  252                 } else {
  253                         np->n_size = vap->va_size;
  254                 }
  255         }
  256         bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
  257         if (np->n_flag & NCHG) {
  258                 if (np->n_flag & NACC)
  259                         vaper->va_atime = np->n_atim;
  260                 if (np->n_flag & NUPD)
  261                         vaper->va_mtime = np->n_mtim;
  262         }
  263         mtx_unlock(&np->n_mtx);
  264 #ifdef NFS_ACDEBUG
  265         mtx_unlock(&Giant);     /* ncl_printf() */
  266 #endif
  267         return (0);
  268 }
  269 
  270 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
  271 /*
  272  * This function finds the directory cookie that corresponds to the
  273  * logical byte offset given.
  274  */
  275 nfsuint64 *
  276 ncl_getcookie(struct nfsnode *np, off_t off, int add)
  277 {
  278         struct nfsdmap *dp, *dp2;
  279         int pos;
  280         nfsuint64 *retval = NULL;
  281         
  282         pos = (uoff_t)off / NFS_DIRBLKSIZ;
  283         if (pos == 0 || off < 0) {
  284                 KASSERT(!add, ("nfs getcookie add at <= 0"));
  285                 return (&nfs_nullcookie);
  286         }
  287         pos--;
  288         dp = LIST_FIRST(&np->n_cookies);
  289         if (!dp) {
  290                 if (add) {
  291                         MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
  292                                 M_NFSDIROFF, M_WAITOK);
  293                         dp->ndm_eocookie = 0;
  294                         LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
  295                 } else
  296                         goto out;
  297         }
  298         while (pos >= NFSNUMCOOKIES) {
  299                 pos -= NFSNUMCOOKIES;
  300                 if (LIST_NEXT(dp, ndm_list)) {
  301                         if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
  302                             pos >= dp->ndm_eocookie)
  303                                 goto out;
  304                         dp = LIST_NEXT(dp, ndm_list);
  305                 } else if (add) {
  306                         MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
  307                                 M_NFSDIROFF, M_WAITOK);
  308                         dp2->ndm_eocookie = 0;
  309                         LIST_INSERT_AFTER(dp, dp2, ndm_list);
  310                         dp = dp2;
  311                 } else
  312                         goto out;
  313         }
  314         if (pos >= dp->ndm_eocookie) {
  315                 if (add)
  316                         dp->ndm_eocookie = pos + 1;
  317                 else
  318                         goto out;
  319         }
  320         retval = &dp->ndm_cookies[pos];
  321 out:
  322         return (retval);
  323 }
  324 
  325 /*
  326  * Invalidate cached directory information, except for the actual directory
  327  * blocks (which are invalidated separately).
  328  * Done mainly to avoid the use of stale offset cookies.
  329  */
  330 void
  331 ncl_invaldir(struct vnode *vp)
  332 {
  333         struct nfsnode *np = VTONFS(vp);
  334 
  335         KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
  336         ncl_dircookie_lock(np);
  337         np->n_direofoffset = 0;
  338         np->n_cookieverf.nfsuquad[0] = 0;
  339         np->n_cookieverf.nfsuquad[1] = 0;
  340         if (LIST_FIRST(&np->n_cookies))
  341                 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
  342         ncl_dircookie_unlock(np);
  343 }
  344 
  345 /*
  346  * The write verifier has changed (probably due to a server reboot), so all
  347  * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
  348  * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
  349  * and B_CLUSTEROK flags.  Once done the new write verifier can be set for the
  350  * mount point.
  351  *
  352  * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
  353  * writes are not clusterable.
  354  */
  355 void
  356 ncl_clearcommit(struct mount *mp)
  357 {
  358         struct vnode *vp, *nvp;
  359         struct buf *bp, *nbp;
  360         struct bufobj *bo;
  361 
  362         MNT_ILOCK(mp);
  363         MNT_VNODE_FOREACH(vp, mp, nvp) {
  364                 bo = &vp->v_bufobj;
  365                 VI_LOCK(vp);
  366                 if (vp->v_iflag & VI_DOOMED) {
  367                         VI_UNLOCK(vp);
  368                         continue;
  369                 }
  370                 vholdl(vp);
  371                 VI_UNLOCK(vp);
  372                 MNT_IUNLOCK(mp);
  373                 BO_LOCK(bo);
  374                 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
  375                         if (!BUF_ISLOCKED(bp) &&
  376                             (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
  377                                 == (B_DELWRI | B_NEEDCOMMIT))
  378                                 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
  379                 }
  380                 BO_UNLOCK(bo);
  381                 vdrop(vp);
  382                 MNT_ILOCK(mp);
  383         }
  384         MNT_IUNLOCK(mp);
  385 }
  386 
  387 /*
  388  * Called once to initialize data structures...
  389  */
  390 int
  391 ncl_init(struct vfsconf *vfsp)
  392 {
  393         int i;
  394 
  395         /* Ensure async daemons disabled */
  396         for (i = 0; i < NFS_MAXRAHEAD; i++) {
  397                 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
  398                 ncl_iodmount[i] = NULL;
  399         }
  400         ncl_nhinit();                   /* Init the nfsnode table */
  401 
  402         return (0);
  403 }
  404
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FreeBSD/Linux Kernel Cross Reference sys/fs/nfsclient/nfs_clsubs.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/nfs_clsubs.c
