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 {
   78         struct hpfs_args args;
   79         struct export_args exp;
   80         int error;
   81 
   82         error = copyin(data, (caddr_t)&args, sizeof (struct hpfs_args));
   83         if (error)
   84                 return (error);
   85         vfs_oexport_conv(&args.export, &exp);
   86 
   87         ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
   88         ma = mount_arg(ma, "export", &exp, sizeof(exp));
   89         ma = mount_argf(ma, "uid", "%d", args.uid);
   90         ma = mount_argf(ma, "gid", "%d", args.gid);
   91         ma = mount_argf(ma, "mode", "%d", args.mode);
   92         if (args.flags & HPFSMNT_TABLES) {
   93                 ma = mount_arg(ma, "d2u", args.d2u, sizeof args.d2u);
   94                 ma = mount_arg(ma, "u2d", args.u2d, sizeof args.u2d);
   95         }
   96 
   97         error = kernel_mount(ma, flags);
   98 
   99         return (error);
  100 }
  101 
  102 static const char *hpfs_opts[] = {
  103         "from", "export", "uid", "gid", "mode", "d2u", "u2d", NULL
  104 };
  105 
  106 static int
  107 hpfs_mount (struct mount *mp)
  108 {
  109         int             err = 0, error;
  110         struct vnode    *devvp;
  111         struct thread *td;
  112         struct nameidata ndp;
  113         struct export_args export;
  114         char *from;
  115 
  116         td = curthread;
  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                 if (from == NULL) {
  138                         error = vfs_copyopt(mp->mnt_optnew, "export",
  139                             &export, sizeof export);
  140                         if (error)
  141                                 return (error);
  142                         dprintf(("export 0x%x\n",args.export.ex_flags));
  143                         err = vfs_export(mp, &export);
  144                         if (err) {
  145                                 printf("hpfs_omount: vfs_export failed %d\n",
  146                                         err);
  147                         }
  148                         goto success;
  149                 } else {
  150                         dprintf(("name [FAILED]\n"));
  151                         err = EINVAL;
  152                         goto success;
  153                 }
  154                 dprintf(("\n"));
  155         }
  156 
  157         /*
  158          * Not an update, or updating the name: look up the name
  159          * and verify that it refers to a sensible block device.
  160          */
  161         NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td);
  162         err = namei(&ndp);
  163         if (err) {
  164                 /* can't get devvp!*/
  165                 goto error_1;
  166         }
  167 
  168         devvp = ndp.ni_vp;
  169 
  170         if (!vn_isdisk(devvp, &err)) {
  171                 vput(devvp);
  172                 return (err);
  173         }
  174 
  175         /*
  176          ********************
  177          * NEW MOUNT
  178          ********************
  179          */
  180 
  181         /*
  182          * Since this is a new mount, we want the names for
  183          * the device and the mount point copied in.  If an
  184          * error occurs, the mountpoint is discarded by the
  185          * upper level code.  Note that vfs_omount() handles
  186          * copying the mountpoint f_mntonname for us, so we
  187          * don't have to do it here unless we want to set it
  188          * to something other than "path" for some rason.
  189          */
  190         /* Save "mounted from" info for mount point (NULL pad)*/
  191         vfs_mountedfrom(mp, from);
  192 
  193         err = hpfs_mountfs(devvp, mp, td);
  194         if (err) {
  195                 vrele(devvp);
  196                 goto error_1;
  197         }
  198 
  199         goto success;
  200 
  201 error_1:        /* no state to back out*/
  202         /* XXX: Missing NDFREE(&ndp, ...) */
  203 
  204 success:
  205         return( err);
  206 }
  207 
  208 /*
  209  * Common code for mount and mountroot
  210  */
  211 int
  212 hpfs_mountfs(devvp, mp, td)
  213         register struct vnode *devvp;
  214         struct mount *mp;
  215         struct thread *td;
  216 {
  217         int error, ronly, v;
  218         struct sublock *sup;
  219         struct spblock *spp;
  220         struct hpfsmount *hpmp;
  221         struct buf *bp = NULL;
  222         struct vnode *vp;
  223         struct cdev *dev = devvp->v_rdev;
  224         struct g_consumer *cp;
  225         struct bufobj *bo;
  226 
  227         if (mp->mnt_flag & MNT_ROOTFS)
  228                 return (EOPNOTSUPP);
  229         dprintf(("hpfs_mountfs():\n"));
  230         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
  231         /* XXX: use VOP_ACCESS to check FS perms */
  232         DROP_GIANT();
  233         g_topology_lock();
  234         error = g_vfs_open(devvp, &cp, "hpfs", ronly ? 0 : 1);
  235         g_topology_unlock();
  236         PICKUP_GIANT();
  237         VOP_UNLOCK(devvp, 0);
  238         if (error)
  239                 return (error);
  240 
  241         bo = &devvp->v_bufobj;
  242         bo->bo_private = cp;
  243         bo->bo_ops = g_vfs_bufops;
  244 
  245         /*
  246          * Do actual mount
  247          */
  248         hpmp = malloc(sizeof(struct hpfsmount), M_HPFSMNT, M_WAITOK | M_ZERO);
  249 
  250         hpmp->hpm_cp = cp;
  251         hpmp->hpm_bo = bo;
  252 
  253         /* Read in SuperBlock */
  254         error = bread(devvp, SUBLOCK, SUSIZE, NOCRED, &bp);
  255         if (error)
  256                 goto failed;
  257         bcopy(bp->b_data, &hpmp->hpm_su, sizeof(struct sublock));
  258         brelse(bp); bp = NULL;
  259 
  260         /* Read in SpareBlock */
  261         error = bread(devvp, SPBLOCK, SPSIZE, NOCRED, &bp);
  262         if (error)
  263                 goto failed;
  264         bcopy(bp->b_data, &hpmp->hpm_sp, sizeof(struct spblock));
  265         brelse(bp); bp = NULL;
  266 
  267         sup = &hpmp->hpm_su;
  268         spp = &hpmp->hpm_sp;
  269 
  270         /* Check magic */
  271         if (sup->su_magic != SU_MAGIC) {
  272                 printf("hpfs_mountfs: SuperBlock MAGIC DOESN'T MATCH\n");
  273                 error = EINVAL;
  274                 goto failed;
  275         }
  276         if (spp->sp_magic != SP_MAGIC) {
  277                 printf("hpfs_mountfs: SpareBlock MAGIC DOESN'T MATCH\n");
  278                 error = EINVAL;
  279                 goto failed;
  280         }
  281 
  282         mp->mnt_data = hpmp;
  283         hpmp->hpm_devvp = devvp;
  284         hpmp->hpm_dev = devvp->v_rdev;
  285         hpmp->hpm_mp = mp;
  286         if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v))
  287                 hpmp->hpm_uid = v;
  288         if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v))
  289                 hpmp->hpm_gid = v;
  290         if (1 == vfs_scanopt(mp->mnt_optnew, "mode", "%d", &v))
  291                 hpmp->hpm_mode = v;
  292 
  293         error = hpfs_bminit(hpmp);
  294         if (error)
  295                 goto failed;
  296 
  297         error = hpfs_cpinit(mp, hpmp);
  298         if (error) {
  299                 hpfs_bmdeinit(hpmp);
  300                 goto failed;
  301         }
  302 
  303         error = hpfs_root(mp, LK_EXCLUSIVE, &vp);
  304         if (error) {
  305                 hpfs_cpdeinit(hpmp);
  306                 hpfs_bmdeinit(hpmp);
  307                 goto failed;
  308         }
  309 
  310         vput(vp);
  311 
  312         mp->mnt_stat.f_fsid.val[0] = (long)dev2udev(dev);
  313         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  314         mp->mnt_maxsymlinklen = 0;
  315         MNT_ILOCK(mp);
  316         mp->mnt_flag |= MNT_LOCAL;
  317         MNT_IUNLOCK(mp);
  318         return (0);
  319 
  320 failed:
  321         if (bp)
  322                 brelse (bp);
  323         mp->mnt_data = NULL;
  324         DROP_GIANT();
  325         g_topology_lock();
  326         g_vfs_close(cp);
  327         g_topology_unlock();
  328         PICKUP_GIANT();
  329         return (error);
  330 }
  331 
  332 static int
  333 hpfs_unmount( 
  334         struct mount *mp,
  335         int mntflags)
  336 {
  337         int error, flags;
  338         register struct hpfsmount *hpmp = VFSTOHPFS(mp);
  339 
  340         dprintf(("hpfs_unmount():\n"));
  341 
  342         flags = 0;
  343         if(mntflags & MNT_FORCE)
  344                 flags |= FORCECLOSE;
  345 
  346         dprintf(("hpfs_unmount: vflushing...\n"));
  347         
  348         error = vflush(mp, 0, flags, curthread);
  349         if (error) {
  350                 printf("hpfs_unmount: vflush failed: %d\n",error);
  351                 return (error);
  352         }
  353 
  354         vinvalbuf(hpmp->hpm_devvp, V_SAVE, 0, 0);
  355         DROP_GIANT();
  356         g_topology_lock();
  357         g_vfs_close(hpmp->hpm_cp);
  358         g_topology_unlock();
  359         PICKUP_GIANT();
  360         vrele(hpmp->hpm_devvp);
  361 
  362         dprintf(("hpfs_umount: freeing memory...\n"));
  363         hpfs_cpdeinit(hpmp);
  364         hpfs_bmdeinit(hpmp);
  365         mp->mnt_data = NULL;
  366         MNT_ILOCK(mp);
  367         mp->mnt_flag &= ~MNT_LOCAL;
  368         MNT_IUNLOCK(mp);
  369         free(hpmp, M_HPFSMNT);
  370 
  371         return (0);
  372 }
  373 
  374 static int
  375 hpfs_root(
  376         struct mount *mp,
  377         int flags,
  378         struct vnode **vpp)
  379 {
  380         int error = 0;
  381         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  382 
  383         dprintf(("hpfs_root():\n"));
  384         error = VFS_VGET(mp, (ino_t)hpmp->hpm_su.su_rootfno, LK_EXCLUSIVE, vpp);
  385         if(error) {
  386                 printf("hpfs_root: VFS_VGET failed: %d\n",error);
  387                 return (error);
  388         }
  389 
  390         return (error);
  391 }
  392 
  393 static int
  394 hpfs_statfs(
  395         struct mount *mp,
  396         struct statfs *sbp)
  397 {
  398         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  399 
  400         dprintf(("hpfs_statfs(): HPFS%d.%d\n",
  401                 hpmp->hpm_su.su_hpfsver, hpmp->hpm_su.su_fnctver));
  402 
  403         sbp->f_type = mp->mnt_vfc->vfc_typenum;
  404         sbp->f_bsize = DEV_BSIZE;
  405         sbp->f_iosize = DEV_BSIZE;
  406         sbp->f_blocks = hpmp->hpm_su.su_btotal;
  407         sbp->f_bfree = sbp->f_bavail = hpmp->hpm_bavail;
  408         sbp->f_ffree = 0;
  409         sbp->f_files = 0;
  410         sbp->f_flags = mp->mnt_flag;
  411         
  412         return (0);
  413 }
  414 
  415 /*ARGSUSED*/
  416 static int
  417 hpfs_fhtovp(
  418         struct mount *mp,
  419         struct fid *fhp,
  420         struct vnode **vpp)
  421 {
  422         struct vnode *nvp;
  423         struct hpfid *hpfhp = (struct hpfid *)fhp;
  424         int error;
  425 
  426         if ((error = VFS_VGET(mp, hpfhp->hpfid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
  427                 *vpp = NULLVP;
  428                 return (error);
  429         }
  430         /* XXX as unlink/rmdir/mkdir/creat are not currently possible
  431          * with HPFS, we don't need to check anything else for now */
  432         *vpp = nvp;
  433 
  434         return (0);
  435 }
  436 
  437 static int
  438 hpfs_vget(
  439         struct mount *mp,
  440         ino_t ino,
  441         int flags,
  442         struct vnode **vpp) 
  443 {
  444         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  445         struct vnode *vp;
  446         struct hpfsnode *hp;
  447         struct buf *bp;
  448         int error;
  449 
  450         dprintf(("hpfs_vget(0x%x): ",ino));
  451 
  452         error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL);
  453         if (error || *vpp != NULL)
  454                 return (error);
  455 
  456         *vpp = NULL;
  457         hp = NULL;
  458         vp = NULL;
  459 
  460         /*
  461          * We have to lock node creation for a while,
  462          * but then we have to call getnewvnode(), 
  463          * this may cause hpfs_reclaim() to be called,
  464          * this may need to VOP_VGET() parent dir for
  465          * update reasons, and if parent is not in
  466          * hash, we have to lock node creation...
  467          * To solve this, we MALLOC, getnewvnode and init while
  468          * not locked (probability of node appearence
  469          * at that time is little, and anyway - we'll
  470          * check for it).
  471          */
  472         hp = malloc(sizeof(struct hpfsnode), 
  473                 M_HPFSNO, M_WAITOK);
  474 
  475         error = getnewvnode("hpfs", mp, &hpfs_vnodeops, &vp);
  476         if (error) {
  477                 printf("hpfs_vget: can't get new vnode\n");
  478                 free(hp, M_HPFSNO);
  479                 return (error);
  480         }
  481 
  482         dprintf(("prenew "));
  483 
  484         vp->v_data = hp;
  485 
  486         if (ino == (ino_t)hpmp->hpm_su.su_rootfno) 
  487                 vp->v_vflag |= VV_ROOT;
  488 
  489 
  490         mtx_init(&hp->h_interlock, "hpfsnode interlock", NULL, MTX_DEF);
  491 
  492         hp->h_flag = H_INVAL;
  493         hp->h_vp = vp;
  494         hp->h_hpmp = hpmp;
  495         hp->h_no = ino;
  496         hp->h_dev = hpmp->hpm_dev;
  497         hp->h_uid = hpmp->hpm_uid;
  498         hp->h_gid = hpmp->hpm_uid;
  499         hp->h_mode = hpmp->hpm_mode;
  500         hp->h_devvp = hpmp->hpm_devvp;
  501 
  502         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  503         error = insmntque(vp, mp);
  504         if (error != 0) {
  505                 free(hp, M_HPFSNO);
  506                 return (error);
  507         }
  508         error = vfs_hash_insert(vp, ino, flags, curthread, vpp, NULL, NULL);
  509         if (error || *vpp != NULL)
  510                 return (error);
  511 
  512         error = bread(hpmp->hpm_devvp, ino, FNODESIZE, NOCRED, &bp);
  513         if (error) {
  514                 printf("hpfs_vget: can't read ino %d\n",ino);
  515                 vput(vp);
  516                 return (error);
  517         }
  518         bcopy(bp->b_data, &hp->h_fn, sizeof(struct fnode));
  519         brelse(bp);
  520 
  521         if (hp->h_fn.fn_magic != FN_MAGIC) {
  522                 printf("hpfs_vget: MAGIC DOESN'T MATCH\n");
  523                 vput(vp);
  524                 return (EINVAL);
  525         }
  526 
  527         vp->v_type = hp->h_fn.fn_flag ? VDIR:VREG;
  528         hp->h_flag &= ~H_INVAL;
  529 
  530         *vpp = vp;
  531 
  532         return (0);
  533 }
  534 
  535 static struct vfsops hpfs_vfsops = {
  536         .vfs_fhtovp =           hpfs_fhtovp,
  537         .vfs_cmount =           hpfs_cmount,
  538         .vfs_mount =            hpfs_mount,
  539         .vfs_root =             hpfs_root,
  540         .vfs_statfs =           hpfs_statfs,
  541         .vfs_unmount =          hpfs_unmount,
  542         .vfs_vget =             hpfs_vget,
  543 };
  544 VFS_SET(hpfs_vfsops, hpfs, 0);
Cache object: 30693343754951fe9360cf4b516e9b94
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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
