hpfs_vfsops.c

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    1 /*-
    2  * Copyright (c) 1998, 1999 Semen Ustimenko (semenu@FreeBSD.org)
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/namei.h>
   33 #include <sys/conf.h>
   34 #include <sys/proc.h>
   35 #include <sys/kernel.h>
   36 #include <sys/vnode.h>
   37 #include <sys/mount.h>
   38 #include <sys/bio.h>
   39 #include <sys/buf.h>
   40 #include <sys/fcntl.h>
   41 #include <sys/malloc.h>
   42 
   43 #include <geom/geom.h>
   44 #include <geom/geom_vfs.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/vm_param.h>
   48 #include <vm/vm_page.h>
   49 #include <vm/vm_object.h>
   50 #include <vm/vm_extern.h>
   51 
   52 #include <fs/hpfs/hpfs.h>
   53 #include <fs/hpfs/hpfsmount.h>
   54 #include <fs/hpfs/hpfs_subr.h>
   55 
   56 MALLOC_DEFINE(M_HPFSMNT, "hpfs_mount", "HPFS mount structure");
   57 MALLOC_DEFINE(M_HPFSNO, "hpfs_node", "HPFS node structure");
   58 
   59 struct sockaddr;
   60 
   61 static int      hpfs_mountfs(register struct vnode *, struct mount *, 
   62                                   struct thread *);
   63 
   64 static vfs_fhtovp_t     hpfs_fhtovp;
   65 static vfs_vget_t       hpfs_vget;
   66 static vfs_cmount_t     hpfs_cmount;
   67 static vfs_mount_t      hpfs_mount;
   68 static vfs_root_t       hpfs_root;
   69 static vfs_statfs_t     hpfs_statfs;
   70 static vfs_unmount_t    hpfs_unmount;
   71 
   72 static int
   73 hpfs_cmount ( 
   74         struct mntarg *ma,
   75         void *data,
   76         int flags,
   77         struct thread *td )
   78 {
   79         struct hpfs_args args;
   80         int error;
   81 
   82         error = copyin(data, (caddr_t)&args, sizeof (struct hpfs_args));
   83         if (error)
   84                 return (error);
   85 
   86         ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
   87         ma = mount_arg(ma, "export", &args.export, sizeof args.export);
   88         ma = mount_argf(ma, "uid", "%d", args.uid);
   89         ma = mount_argf(ma, "gid", "%d", args.gid);
   90         ma = mount_argf(ma, "mode", "%d", args.mode);
   91         if (args.flags & HPFSMNT_TABLES) {
   92                 ma = mount_arg(ma, "d2u", args.d2u, sizeof args.d2u);
   93                 ma = mount_arg(ma, "u2d", args.u2d, sizeof args.u2d);
   94         }
   95 
   96         error = kernel_mount(ma, flags);
   97 
   98         return (error);
   99 }
  100 
  101 static const char *hpfs_opts[] = {
  102         "from", "export", "uid", "gid", "mode", "d2u", "u2d", NULL
  103 };
  104 
  105 static int
  106 hpfs_mount ( 
  107         struct mount *mp,
  108         struct thread *td )
  109 {
  110         int             err = 0, error;
  111         struct vnode    *devvp;
  112         struct hpfsmount *hpmp = 0;
  113         struct nameidata ndp;
  114         struct export_args export;
  115         char *from;
  116 
  117         dprintf(("hpfs_omount():\n"));
  118         /*
  119          ***
  120          * Mounting non-root filesystem or updating a filesystem
  121          ***
  122          */
  123         if (vfs_filteropt(mp->mnt_optnew, hpfs_opts))
  124                 return (EINVAL);
  125 
  126         from = vfs_getopts(mp->mnt_optnew, "from", &error);
  127         if (error)
  128                 return (error);
  129 
  130         /*
  131          * If updating, check whether changing from read-only to
  132          * read/write; if there is no device name, that's all we do.
  133          */
  134         if (mp->mnt_flag & MNT_UPDATE) {
  135                 dprintf(("hpfs_omount: MNT_UPDATE: "));
  136 
  137                 hpmp = VFSTOHPFS(mp);
  138 
  139                 if (from == NULL) {
  140                         error = vfs_copyopt(mp->mnt_optnew, "export",
  141                             &export, sizeof export);
  142                         if (error)
  143                                 return (error);
  144                         dprintf(("export 0x%x\n",args.export.ex_flags));
  145                         err = vfs_export(mp, &export);
  146                         if (err) {
  147                                 printf("hpfs_omount: vfs_export failed %d\n",
  148                                         err);
  149                         }
  150                         goto success;
  151                 } else {
  152                         dprintf(("name [FAILED]\n"));
  153                         err = EINVAL;
  154                         goto success;
  155                 }
  156                 dprintf(("\n"));
  157         }
  158 
  159         /*
  160          * Not an update, or updating the name: look up the name
  161          * and verify that it refers to a sensible block device.
  162          */
  163         NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td);
  164         err = namei(&ndp);
  165         if (err) {
  166                 /* can't get devvp!*/
  167                 goto error_1;
  168         }
  169 
  170         devvp = ndp.ni_vp;
  171 
  172         if (!vn_isdisk(devvp, &err)) {
  173                 vput(devvp);
  174                 return (err);
  175         }
  176 
  177         /*
  178          ********************
  179          * NEW MOUNT
  180          ********************
  181          */
  182 
  183         /*
  184          * Since this is a new mount, we want the names for
  185          * the device and the mount point copied in.  If an
  186          * error occurs, the mountpoint is discarded by the
  187          * upper level code.  Note that vfs_omount() handles
  188          * copying the mountpoint f_mntonname for us, so we
  189          * don't have to do it here unless we want to set it
  190          * to something other than "path" for some rason.
  191          */
  192         /* Save "mounted from" info for mount point (NULL pad)*/
  193         vfs_mountedfrom(mp, from);
  194 
  195         err = hpfs_mountfs(devvp, mp, td);
  196         if (err) {
  197                 vrele(devvp);
  198                 goto error_1;
  199         }
  200 
  201         goto success;
  202 
  203 error_1:        /* no state to back out*/
  204         /* XXX: Missing NDFREE(&ndp, ...) */
  205 
  206 success:
  207         return( err);
  208 }
  209 
  210 /*
  211  * Common code for mount and mountroot
  212  */
  213 int
  214 hpfs_mountfs(devvp, mp, td)
  215         register struct vnode *devvp;
  216         struct mount *mp;
  217         struct thread *td;
  218 {
  219         int error, ronly, v;
  220         struct sublock *sup;
  221         struct spblock *spp;
  222         struct hpfsmount *hpmp;
  223         struct buf *bp = NULL;
  224         struct vnode *vp;
  225         struct cdev *dev = devvp->v_rdev;
  226         struct g_consumer *cp;
  227         struct bufobj *bo;
  228 
  229         if (mp->mnt_flag & MNT_ROOTFS)
  230                 return (EOPNOTSUPP);
  231         dprintf(("hpfs_mountfs():\n"));
  232         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
  233         /* XXX: use VOP_ACCESS to check FS perms */
  234         DROP_GIANT();
  235         g_topology_lock();
  236         error = g_vfs_open(devvp, &cp, "hpfs", ronly ? 0 : 1);
  237         g_topology_unlock();
  238         PICKUP_GIANT();
  239         VOP_UNLOCK(devvp, 0, td);
  240         if (error)
  241                 return (error);
  242 
  243         bo = &devvp->v_bufobj;
  244         bo->bo_private = cp;
  245         bo->bo_ops = g_vfs_bufops;
  246 
  247         /*
  248          * Do actual mount
  249          */
  250         hpmp = malloc(sizeof(struct hpfsmount), M_HPFSMNT, M_WAITOK | M_ZERO);
  251 
  252         hpmp->hpm_cp = cp;
  253         hpmp->hpm_bo = bo;
  254 
  255         /* Read in SuperBlock */
  256         error = bread(devvp, SUBLOCK, SUSIZE, NOCRED, &bp);
  257         if (error)
  258                 goto failed;
  259         bcopy(bp->b_data, &hpmp->hpm_su, sizeof(struct sublock));
  260         brelse(bp); bp = NULL;
  261 
  262         /* Read in SpareBlock */
  263         error = bread(devvp, SPBLOCK, SPSIZE, NOCRED, &bp);
  264         if (error)
  265                 goto failed;
  266         bcopy(bp->b_data, &hpmp->hpm_sp, sizeof(struct spblock));
  267         brelse(bp); bp = NULL;
  268 
  269         sup = &hpmp->hpm_su;
  270         spp = &hpmp->hpm_sp;
  271 
  272         /* Check magic */
  273         if (sup->su_magic != SU_MAGIC) {
  274                 printf("hpfs_mountfs: SuperBlock MAGIC DOESN'T MATCH\n");
  275                 error = EINVAL;
  276                 goto failed;
  277         }
  278         if (spp->sp_magic != SP_MAGIC) {
  279                 printf("hpfs_mountfs: SpareBlock MAGIC DOESN'T MATCH\n");
  280                 error = EINVAL;
  281                 goto failed;
  282         }
  283 
  284         mp->mnt_data = (qaddr_t)hpmp;
  285         hpmp->hpm_devvp = devvp;
  286         hpmp->hpm_dev = devvp->v_rdev;
  287         hpmp->hpm_mp = mp;
  288         if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v))
  289                 hpmp->hpm_uid = v;
  290         if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v))
  291                 hpmp->hpm_gid = v;
  292         if (1 == vfs_scanopt(mp->mnt_optnew, "mode", "%d", &v))
  293                 hpmp->hpm_mode = v;
  294 
  295         error = hpfs_bminit(hpmp);
  296         if (error)
  297                 goto failed;
  298 
  299         error = hpfs_cpinit(mp, hpmp);
  300         if (error) {
  301                 hpfs_bmdeinit(hpmp);
  302                 goto failed;
  303         }
  304 
  305         error = hpfs_root(mp, LK_EXCLUSIVE, &vp, td);
  306         if (error) {
  307                 hpfs_cpdeinit(hpmp);
  308                 hpfs_bmdeinit(hpmp);
  309                 goto failed;
  310         }
  311 
  312         vput(vp);
  313 
  314         mp->mnt_stat.f_fsid.val[0] = (long)dev2udev(dev);
  315         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  316         mp->mnt_maxsymlinklen = 0;
  317         MNT_ILOCK(mp);
  318         mp->mnt_flag |= MNT_LOCAL;
  319         MNT_IUNLOCK(mp);
  320         return (0);
  321 
  322 failed:
  323         if (bp)
  324                 brelse (bp);
  325         mp->mnt_data = (qaddr_t)NULL;
  326         DROP_GIANT();
  327         g_topology_lock();
  328         g_vfs_close(cp, td);
  329         g_topology_unlock();
  330         PICKUP_GIANT();
  331         return (error);
  332 }
  333 
  334 static int
  335 hpfs_unmount( 
  336         struct mount *mp,
  337         int mntflags,
  338         struct thread *td)
  339 {
  340         int error, flags, ronly;
  341         register struct hpfsmount *hpmp = VFSTOHPFS(mp);
  342 
  343         dprintf(("hpfs_unmount():\n"));
  344 
  345         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
  346 
  347         flags = 0;
  348         if(mntflags & MNT_FORCE)
  349                 flags |= FORCECLOSE;
  350 
  351         dprintf(("hpfs_unmount: vflushing...\n"));
  352         
  353         error = vflush(mp, 0, flags, td);
  354         if (error) {
  355                 printf("hpfs_unmount: vflush failed: %d\n",error);
  356                 return (error);
  357         }
  358 
  359         vinvalbuf(hpmp->hpm_devvp, V_SAVE, td, 0, 0);
  360         DROP_GIANT();
  361         g_topology_lock();
  362         g_vfs_close(hpmp->hpm_cp, td);
  363         g_topology_unlock();
  364         PICKUP_GIANT();
  365         vrele(hpmp->hpm_devvp);
  366 
  367         dprintf(("hpfs_umount: freeing memory...\n"));
  368         hpfs_cpdeinit(hpmp);
  369         hpfs_bmdeinit(hpmp);
  370         mp->mnt_data = (qaddr_t)0;
  371         MNT_ILOCK(mp);
  372         mp->mnt_flag &= ~MNT_LOCAL;
  373         MNT_IUNLOCK(mp);
  374         FREE(hpmp, M_HPFSMNT);
  375 
  376         return (0);
  377 }
  378 
  379 static int
  380 hpfs_root(
  381         struct mount *mp,
  382         int flags,
  383         struct vnode **vpp,
  384         struct thread *td )
  385 {
  386         int error = 0;
  387         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  388 
  389         dprintf(("hpfs_root():\n"));
  390         error = VFS_VGET(mp, (ino_t)hpmp->hpm_su.su_rootfno, LK_EXCLUSIVE, vpp);
  391         if(error) {
  392                 printf("hpfs_root: VFS_VGET failed: %d\n",error);
  393                 return (error);
  394         }
  395 
  396         return (error);
  397 }
  398 
  399 static int
  400 hpfs_statfs(
  401         struct mount *mp,
  402         struct statfs *sbp,
  403         struct thread *td)
  404 {
  405         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  406 
  407         dprintf(("hpfs_statfs(): HPFS%d.%d\n",
  408                 hpmp->hpm_su.su_hpfsver, hpmp->hpm_su.su_fnctver));
  409 
  410         sbp->f_type = mp->mnt_vfc->vfc_typenum;
  411         sbp->f_bsize = DEV_BSIZE;
  412         sbp->f_iosize = DEV_BSIZE;
  413         sbp->f_blocks = hpmp->hpm_su.su_btotal;
  414         sbp->f_bfree = sbp->f_bavail = hpmp->hpm_bavail;
  415         sbp->f_ffree = 0;
  416         sbp->f_files = 0;
  417         sbp->f_flags = mp->mnt_flag;
  418         
  419         return (0);
  420 }
  421 
  422 /*ARGSUSED*/
  423 static int
  424 hpfs_fhtovp(
  425         struct mount *mp,
  426         struct fid *fhp,
  427         struct vnode **vpp)
  428 {
  429         struct vnode *nvp;
  430         struct hpfid *hpfhp = (struct hpfid *)fhp;
  431         int error;
  432 
  433         if ((error = VFS_VGET(mp, hpfhp->hpfid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
  434                 *vpp = NULLVP;
  435                 return (error);
  436         }
  437         /* XXX as unlink/rmdir/mkdir/creat are not currently possible
  438          * with HPFS, we don't need to check anything else for now */
  439         *vpp = nvp;
  440 
  441         return (0);
  442 }
  443 
  444 static int
  445 hpfs_vget(
  446         struct mount *mp,
  447         ino_t ino,
  448         int flags,
  449         struct vnode **vpp) 
  450 {
  451         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  452         struct vnode *vp;
  453         struct hpfsnode *hp;
  454         struct buf *bp;
  455         int error;
  456         struct thread *td;
  457 
  458         dprintf(("hpfs_vget(0x%x): ",ino));
  459 
  460         error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL);
  461         if (error || *vpp != NULL)
  462                 return (error);
  463 
  464         *vpp = NULL;
  465         hp = NULL;
  466         vp = NULL;
  467 
  468         /*
  469          * We have to lock node creation for a while,
  470          * but then we have to call getnewvnode(), 
  471          * this may cause hpfs_reclaim() to be called,
  472          * this may need to VOP_VGET() parent dir for
  473          * update reasons, and if parent is not in
  474          * hash, we have to lock node creation...
  475          * To solve this, we MALLOC, getnewvnode and init while
  476          * not locked (probability of node appearence
  477          * at that time is little, and anyway - we'll
  478          * check for it).
  479          */
  480         MALLOC(hp, struct hpfsnode *, sizeof(struct hpfsnode), 
  481                 M_HPFSNO, M_WAITOK);
  482 
  483         error = getnewvnode("hpfs", mp, &hpfs_vnodeops, &vp);
  484         if (error) {
  485                 printf("hpfs_vget: can't get new vnode\n");
  486                 FREE(hp, M_HPFSNO);
  487                 return (error);
  488         }
  489 
  490         dprintf(("prenew "));
  491 
  492         vp->v_data = hp;
  493 
  494         if (ino == (ino_t)hpmp->hpm_su.su_rootfno) 
  495                 vp->v_vflag |= VV_ROOT;
  496 
  497 
  498         mtx_init(&hp->h_interlock, "hpfsnode interlock", NULL, MTX_DEF);
  499 
  500         hp->h_flag = H_INVAL;
  501         hp->h_vp = vp;
  502         hp->h_hpmp = hpmp;
  503         hp->h_no = ino;
  504         hp->h_dev = hpmp->hpm_dev;
  505         hp->h_uid = hpmp->hpm_uid;
  506         hp->h_gid = hpmp->hpm_uid;
  507         hp->h_mode = hpmp->hpm_mode;
  508         hp->h_devvp = hpmp->hpm_devvp;
  509 
  510         td = curthread;
  511         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL, td);
  512         error = insmntque(vp, mp);
  513         if (error != 0) {
  514                 free(hp, M_HPFSNO);
  515                 return (error);
  516         }
  517         error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
  518         if (error || *vpp != NULL)
  519                 return (error);
  520 
  521         error = bread(hpmp->hpm_devvp, ino, FNODESIZE, NOCRED, &bp);
  522         if (error) {
  523                 printf("hpfs_vget: can't read ino %d\n",ino);
  524                 vput(vp);
  525                 return (error);
  526         }
  527         bcopy(bp->b_data, &hp->h_fn, sizeof(struct fnode));
  528         brelse(bp);
  529 
  530         if (hp->h_fn.fn_magic != FN_MAGIC) {
  531                 printf("hpfs_vget: MAGIC DOESN'T MATCH\n");
  532                 vput(vp);
  533                 return (EINVAL);
  534         }
  535 
  536         vp->v_type = hp->h_fn.fn_flag ? VDIR:VREG;
  537         hp->h_flag &= ~H_INVAL;
  538 
  539         *vpp = vp;
  540 
  541         return (0);
  542 }
  543 
  544 static struct vfsops hpfs_vfsops = {
  545         .vfs_fhtovp =           hpfs_fhtovp,
  546         .vfs_cmount =           hpfs_cmount,
  547         .vfs_mount =            hpfs_mount,
  548         .vfs_root =             hpfs_root,
  549         .vfs_statfs =           hpfs_statfs,
  550         .vfs_unmount =          hpfs_unmount,
  551         .vfs_vget =             hpfs_vget,
  552 };
  553 VFS_SET(hpfs_vfsops, hpfs, 0);
Cache object: 9197601dadf8a6624f2cacf800c76aaa
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FreeBSD/Linux Kernel Cross Reference sys/fs/hpfs/hpfs_vfsops.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/hpfs/hpfs_vfsops.c
