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: releng/8.0/sys/fs/hpfs/hpfs_vfsops.c 191990 2009-05-11 15:33:26Z attilio $
   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 {
   78         struct hpfs_args args;
   79         int error;
   80 
   81         error = copyin(data, (caddr_t)&args, sizeof (struct hpfs_args));
   82         if (error)
   83                 return (error);
   84 
   85         ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
   86         ma = mount_arg(ma, "export", &args.export, sizeof args.export);
   87         ma = mount_argf(ma, "uid", "%d", args.uid);
   88         ma = mount_argf(ma, "gid", "%d", args.gid);
   89         ma = mount_argf(ma, "mode", "%d", args.mode);
   90         if (args.flags & HPFSMNT_TABLES) {
   91                 ma = mount_arg(ma, "d2u", args.d2u, sizeof args.d2u);
   92                 ma = mount_arg(ma, "u2d", args.u2d, sizeof args.u2d);
   93         }
   94 
   95         error = kernel_mount(ma, flags);
   96 
   97         return (error);
   98 }
   99 
  100 static const char *hpfs_opts[] = {
  101         "from", "export", "uid", "gid", "mode", "d2u", "u2d", NULL
  102 };
  103 
  104 static int
  105 hpfs_mount (struct mount *mp)
  106 {
  107         int             err = 0, error;
  108         struct vnode    *devvp;
  109         struct thread *td;
  110         struct nameidata ndp;
  111         struct export_args export;
  112         char *from;
  113 
  114         td = curthread;
  115         dprintf(("hpfs_omount():\n"));
  116         /*
  117          ***
  118          * Mounting non-root filesystem or updating a filesystem
  119          ***
  120          */
  121         if (vfs_filteropt(mp->mnt_optnew, hpfs_opts))
  122                 return (EINVAL);
  123 
  124         from = vfs_getopts(mp->mnt_optnew, "from", &error);
  125         if (error)
  126                 return (error);
  127 
  128         /*
  129          * If updating, check whether changing from read-only to
  130          * read/write; if there is no device name, that's all we do.
  131          */
  132         if (mp->mnt_flag & MNT_UPDATE) {
  133                 dprintf(("hpfs_omount: MNT_UPDATE: "));
  134 
  135                 if (from == NULL) {
  136                         error = vfs_copyopt(mp->mnt_optnew, "export",
  137                             &export, sizeof export);
  138                         if (error)
  139                                 return (error);
  140                         dprintf(("export 0x%x\n",args.export.ex_flags));
  141                         err = vfs_export(mp, &export);
  142                         if (err) {
  143                                 printf("hpfs_omount: vfs_export failed %d\n",
  144                                         err);
  145                         }
  146                         goto success;
  147                 } else {
  148                         dprintf(("name [FAILED]\n"));
  149                         err = EINVAL;
  150                         goto success;
  151                 }
  152                 dprintf(("\n"));
  153         }
  154 
  155         /*
  156          * Not an update, or updating the name: look up the name
  157          * and verify that it refers to a sensible block device.
  158          */
  159         NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td);
  160         err = namei(&ndp);
  161         if (err) {
  162                 /* can't get devvp!*/
  163                 goto error_1;
  164         }
  165 
  166         devvp = ndp.ni_vp;
  167 
  168         if (!vn_isdisk(devvp, &err)) {
  169                 vput(devvp);
  170                 return (err);
  171         }
  172 
  173         /*
  174          ********************
  175          * NEW MOUNT
  176          ********************
  177          */
  178 
  179         /*
  180          * Since this is a new mount, we want the names for
  181          * the device and the mount point copied in.  If an
  182          * error occurs, the mountpoint is discarded by the
  183          * upper level code.  Note that vfs_omount() handles
  184          * copying the mountpoint f_mntonname for us, so we
  185          * don't have to do it here unless we want to set it
  186          * to something other than "path" for some rason.
  187          */
  188         /* Save "mounted from" info for mount point (NULL pad)*/
  189         vfs_mountedfrom(mp, from);
  190 
  191         err = hpfs_mountfs(devvp, mp, td);
  192         if (err) {
  193                 vrele(devvp);
  194                 goto error_1;
  195         }
  196 
  197         goto success;
  198 
  199 error_1:        /* no state to back out*/
  200         /* XXX: Missing NDFREE(&ndp, ...) */
  201 
  202 success:
  203         return( err);
  204 }
  205 
  206 /*
  207  * Common code for mount and mountroot
  208  */
  209 int
  210 hpfs_mountfs(devvp, mp, td)
  211         register struct vnode *devvp;
  212         struct mount *mp;
  213         struct thread *td;
  214 {
  215         int error, ronly, v;
  216         struct sublock *sup;
  217         struct spblock *spp;
  218         struct hpfsmount *hpmp;
  219         struct buf *bp = NULL;
  220         struct vnode *vp;
  221         struct cdev *dev = devvp->v_rdev;
  222         struct g_consumer *cp;
  223         struct bufobj *bo;
  224 
  225         if (mp->mnt_flag & MNT_ROOTFS)
  226                 return (EOPNOTSUPP);
  227         dprintf(("hpfs_mountfs():\n"));
  228         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
  229         /* XXX: use VOP_ACCESS to check FS perms */
  230         DROP_GIANT();
  231         g_topology_lock();
  232         error = g_vfs_open(devvp, &cp, "hpfs", ronly ? 0 : 1);
  233         g_topology_unlock();
  234         PICKUP_GIANT();
  235         VOP_UNLOCK(devvp, 0);
  236         if (error)
  237                 return (error);
  238 
  239         bo = &devvp->v_bufobj;
  240         bo->bo_private = cp;
  241         bo->bo_ops = g_vfs_bufops;
  242 
  243         /*
  244          * Do actual mount
  245          */
  246         hpmp = malloc(sizeof(struct hpfsmount), M_HPFSMNT, M_WAITOK | M_ZERO);
  247 
  248         hpmp->hpm_cp = cp;
  249         hpmp->hpm_bo = bo;
  250 
  251         /* Read in SuperBlock */
  252         error = bread(devvp, SUBLOCK, SUSIZE, NOCRED, &bp);
  253         if (error)
  254                 goto failed;
  255         bcopy(bp->b_data, &hpmp->hpm_su, sizeof(struct sublock));
  256         brelse(bp); bp = NULL;
  257 
  258         /* Read in SpareBlock */
  259         error = bread(devvp, SPBLOCK, SPSIZE, NOCRED, &bp);
  260         if (error)
  261                 goto failed;
  262         bcopy(bp->b_data, &hpmp->hpm_sp, sizeof(struct spblock));
  263         brelse(bp); bp = NULL;
  264 
  265         sup = &hpmp->hpm_su;
  266         spp = &hpmp->hpm_sp;
  267 
  268         /* Check magic */
  269         if (sup->su_magic != SU_MAGIC) {
  270                 printf("hpfs_mountfs: SuperBlock MAGIC DOESN'T MATCH\n");
  271                 error = EINVAL;
  272                 goto failed;
  273         }
  274         if (spp->sp_magic != SP_MAGIC) {
  275                 printf("hpfs_mountfs: SpareBlock MAGIC DOESN'T MATCH\n");
  276                 error = EINVAL;
  277                 goto failed;
  278         }
  279 
  280         mp->mnt_data = hpmp;
  281         hpmp->hpm_devvp = devvp;
  282         hpmp->hpm_dev = devvp->v_rdev;
  283         hpmp->hpm_mp = mp;
  284         if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v))
  285                 hpmp->hpm_uid = v;
  286         if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v))
  287                 hpmp->hpm_gid = v;
  288         if (1 == vfs_scanopt(mp->mnt_optnew, "mode", "%d", &v))
  289                 hpmp->hpm_mode = v;
  290 
  291         error = hpfs_bminit(hpmp);
  292         if (error)
  293                 goto failed;
  294 
  295         error = hpfs_cpinit(mp, hpmp);
  296         if (error) {
  297                 hpfs_bmdeinit(hpmp);
  298                 goto failed;
  299         }
  300 
  301         error = hpfs_root(mp, LK_EXCLUSIVE, &vp);
  302         if (error) {
  303                 hpfs_cpdeinit(hpmp);
  304                 hpfs_bmdeinit(hpmp);
  305                 goto failed;
  306         }
  307 
  308         vput(vp);
  309 
  310         mp->mnt_stat.f_fsid.val[0] = (long)dev2udev(dev);
  311         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  312         mp->mnt_maxsymlinklen = 0;
  313         MNT_ILOCK(mp);
  314         mp->mnt_flag |= MNT_LOCAL;
  315         MNT_IUNLOCK(mp);
  316         return (0);
  317 
  318 failed:
  319         if (bp)
  320                 brelse (bp);
  321         mp->mnt_data = NULL;
  322         DROP_GIANT();
  323         g_topology_lock();
  324         g_vfs_close(cp);
  325         g_topology_unlock();
  326         PICKUP_GIANT();
  327         return (error);
  328 }
  329 
  330 static int
  331 hpfs_unmount( 
  332         struct mount *mp,
  333         int mntflags)
  334 {
  335         int error, flags;
  336         register struct hpfsmount *hpmp = VFSTOHPFS(mp);
  337 
  338         dprintf(("hpfs_unmount():\n"));
  339 
  340         flags = 0;
  341         if(mntflags & MNT_FORCE)
  342                 flags |= FORCECLOSE;
  343 
  344         dprintf(("hpfs_unmount: vflushing...\n"));
  345         
  346         error = vflush(mp, 0, flags, curthread);
  347         if (error) {
  348                 printf("hpfs_unmount: vflush failed: %d\n",error);
  349                 return (error);
  350         }
  351 
  352         vinvalbuf(hpmp->hpm_devvp, V_SAVE, 0, 0);
  353         DROP_GIANT();
  354         g_topology_lock();
  355         g_vfs_close(hpmp->hpm_cp);
  356         g_topology_unlock();
  357         PICKUP_GIANT();
  358         vrele(hpmp->hpm_devvp);
  359 
  360         dprintf(("hpfs_umount: freeing memory...\n"));
  361         hpfs_cpdeinit(hpmp);
  362         hpfs_bmdeinit(hpmp);
  363         mp->mnt_data = NULL;
  364         MNT_ILOCK(mp);
  365         mp->mnt_flag &= ~MNT_LOCAL;
  366         MNT_IUNLOCK(mp);
  367         free(hpmp, M_HPFSMNT);
  368 
  369         return (0);
  370 }
  371 
  372 static int
  373 hpfs_root(
  374         struct mount *mp,
  375         int flags,
  376         struct vnode **vpp)
  377 {
  378         int error = 0;
  379         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  380 
  381         dprintf(("hpfs_root():\n"));
  382         error = VFS_VGET(mp, (ino_t)hpmp->hpm_su.su_rootfno, LK_EXCLUSIVE, vpp);
  383         if(error) {
  384                 printf("hpfs_root: VFS_VGET failed: %d\n",error);
  385                 return (error);
  386         }
  387 
  388         return (error);
  389 }
  390 
  391 static int
  392 hpfs_statfs(
  393         struct mount *mp,
  394         struct statfs *sbp)
  395 {
  396         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  397 
  398         dprintf(("hpfs_statfs(): HPFS%d.%d\n",
  399                 hpmp->hpm_su.su_hpfsver, hpmp->hpm_su.su_fnctver));
  400 
  401         sbp->f_type = mp->mnt_vfc->vfc_typenum;
  402         sbp->f_bsize = DEV_BSIZE;
  403         sbp->f_iosize = DEV_BSIZE;
  404         sbp->f_blocks = hpmp->hpm_su.su_btotal;
  405         sbp->f_bfree = sbp->f_bavail = hpmp->hpm_bavail;
  406         sbp->f_ffree = 0;
  407         sbp->f_files = 0;
  408         sbp->f_flags = mp->mnt_flag;
  409         
  410         return (0);
  411 }
  412 
  413 /*ARGSUSED*/
  414 static int
  415 hpfs_fhtovp(
  416         struct mount *mp,
  417         struct fid *fhp,
  418         struct vnode **vpp)
  419 {
  420         struct vnode *nvp;
  421         struct hpfid *hpfhp = (struct hpfid *)fhp;
  422         int error;
  423 
  424         if ((error = VFS_VGET(mp, hpfhp->hpfid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
  425                 *vpp = NULLVP;
  426                 return (error);
  427         }
  428         /* XXX as unlink/rmdir/mkdir/creat are not currently possible
  429          * with HPFS, we don't need to check anything else for now */
  430         *vpp = nvp;
  431 
  432         return (0);
  433 }
  434 
  435 static int
  436 hpfs_vget(
  437         struct mount *mp,
  438         ino_t ino,
  439         int flags,
  440         struct vnode **vpp) 
  441 {
  442         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  443         struct vnode *vp;
  444         struct hpfsnode *hp;
  445         struct buf *bp;
  446         int error;
  447 
  448         dprintf(("hpfs_vget(0x%x): ",ino));
  449 
  450         error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL);
  451         if (error || *vpp != NULL)
  452                 return (error);
  453 
  454         *vpp = NULL;
  455         hp = NULL;
  456         vp = NULL;
  457 
  458         /*
  459          * We have to lock node creation for a while,
  460          * but then we have to call getnewvnode(), 
  461          * this may cause hpfs_reclaim() to be called,
  462          * this may need to VOP_VGET() parent dir for
  463          * update reasons, and if parent is not in
  464          * hash, we have to lock node creation...
  465          * To solve this, we MALLOC, getnewvnode and init while
  466          * not locked (probability of node appearence
  467          * at that time is little, and anyway - we'll
  468          * check for it).
  469          */
  470         hp = malloc(sizeof(struct hpfsnode), 
  471                 M_HPFSNO, M_WAITOK);
  472 
  473         error = getnewvnode("hpfs", mp, &hpfs_vnodeops, &vp);
  474         if (error) {
  475                 printf("hpfs_vget: can't get new vnode\n");
  476                 free(hp, M_HPFSNO);
  477                 return (error);
  478         }
  479 
  480         dprintf(("prenew "));
  481 
  482         vp->v_data = hp;
  483 
  484         if (ino == (ino_t)hpmp->hpm_su.su_rootfno) 
  485                 vp->v_vflag |= VV_ROOT;
  486 
  487 
  488         mtx_init(&hp->h_interlock, "hpfsnode interlock", NULL, MTX_DEF);
  489 
  490         hp->h_flag = H_INVAL;
  491         hp->h_vp = vp;
  492         hp->h_hpmp = hpmp;
  493         hp->h_no = ino;
  494         hp->h_dev = hpmp->hpm_dev;
  495         hp->h_uid = hpmp->hpm_uid;
  496         hp->h_gid = hpmp->hpm_uid;
  497         hp->h_mode = hpmp->hpm_mode;
  498         hp->h_devvp = hpmp->hpm_devvp;
  499 
  500         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  501         error = insmntque(vp, mp);
  502         if (error != 0) {
  503                 free(hp, M_HPFSNO);
  504                 return (error);
  505         }
  506         error = vfs_hash_insert(vp, ino, flags, curthread, vpp, NULL, NULL);
  507         if (error || *vpp != NULL)
  508                 return (error);
  509 
  510         error = bread(hpmp->hpm_devvp, ino, FNODESIZE, NOCRED, &bp);
  511         if (error) {
  512                 printf("hpfs_vget: can't read ino %d\n",ino);
  513                 vput(vp);
  514                 return (error);
  515         }
  516         bcopy(bp->b_data, &hp->h_fn, sizeof(struct fnode));
  517         brelse(bp);
  518 
  519         if (hp->h_fn.fn_magic != FN_MAGIC) {
  520                 printf("hpfs_vget: MAGIC DOESN'T MATCH\n");
  521                 vput(vp);
  522                 return (EINVAL);
  523         }
  524 
  525         vp->v_type = hp->h_fn.fn_flag ? VDIR:VREG;
  526         hp->h_flag &= ~H_INVAL;
  527 
  528         *vpp = vp;
  529 
  530         return (0);
  531 }
  532 
  533 static struct vfsops hpfs_vfsops = {
  534         .vfs_fhtovp =           hpfs_fhtovp,
  535         .vfs_cmount =           hpfs_cmount,
  536         .vfs_mount =            hpfs_mount,
  537         .vfs_root =             hpfs_root,
  538         .vfs_statfs =           hpfs_statfs,
  539         .vfs_unmount =          hpfs_unmount,
  540         .vfs_vget =             hpfs_vget,
  541 };
  542 VFS_SET(hpfs_vfsops, hpfs, 0);
Cache object: 2ad7435f1cc1a70c219cad3812815310
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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
