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/udf/udf_vfsops.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2001, 2002 Scott Long <scottl@freebsd.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 /* udf_vfsops.c */
   32 /* Implement the VFS side of things */
   33 
   34 /*
   35  * Ok, here's how it goes.  The UDF specs are pretty clear on how each data
   36  * structure is made up, but not very clear on how they relate to each other.
   37  * Here is the skinny... This demostrates a filesystem with one file in the
   38  * root directory.  Subdirectories are treated just as normal files, but they
   39  * have File Id Descriptors of their children as their file data.  As for the
   40  * Anchor Volume Descriptor Pointer, it can exist in two of the following three
   41  * places: sector 256, sector n (the max sector of the disk), or sector
   42  * n - 256.  It's a pretty good bet that one will exist at sector 256 though.
   43  * One caveat is unclosed CD media.  For that, sector 256 cannot be written,
   44  * so the Anchor Volume Descriptor Pointer can exist at sector 512 until the
   45  * media is closed.
   46  *
   47  *  Sector:
   48  *     256:
   49  *       n: Anchor Volume Descriptor Pointer
   50  * n - 256:     |
   51  *              |
   52  *              |-->Main Volume Descriptor Sequence
   53  *                      |       |
   54  *                      |       |
   55  *                      |       |-->Logical Volume Descriptor
   56  *                      |                         |
   57  *                      |-->Partition Descriptor  |
   58  *                              |                 |
   59  *                              |                 |
   60  *                              |-->Fileset Descriptor
   61  *                                      |
   62  *                                      |
   63  *                                      |-->Root Dir File Entry
   64  *                                              |
   65  *                                              |
   66  *                                              |-->File data:
   67  *                                                  File Id Descriptor
   68  *                                                      |
   69  *                                                      |
   70  *                                                      |-->File Entry
   71  *                                                              |
   72  *                                                              |
   73  *                                                              |-->File data
   74  */
   75 #include <sys/types.h>
   76 #include <sys/param.h>
   77 #include <sys/systm.h>
   78 #include <sys/uio.h>
   79 #include <sys/bio.h>
   80 #include <sys/buf.h>
   81 #include <sys/conf.h>
   82 #include <sys/dirent.h>
   83 #include <sys/fcntl.h>
   84 #include <sys/iconv.h>
   85 #include <sys/kernel.h>
   86 #include <sys/malloc.h>
   87 #include <sys/mount.h>
   88 #include <sys/namei.h>
   89 #include <sys/priv.h>
   90 #include <sys/proc.h>
   91 #include <sys/queue.h>
   92 #include <sys/vnode.h>
   93 #include <sys/endian.h>
   94 
   95 #include <geom/geom.h>
   96 #include <geom/geom_vfs.h>
   97 
   98 #include <vm/uma.h>
   99 
  100 #include <fs/udf/ecma167-udf.h>
  101 #include <fs/udf/osta.h>
  102 #include <fs/udf/udf.h>
  103 #include <fs/udf/udf_mount.h>
  104 
  105 static MALLOC_DEFINE(M_UDFMOUNT, "udf_mount", "UDF mount structure");
  106 MALLOC_DEFINE(M_UDFFENTRY, "udf_fentry", "UDF file entry structure");
  107 
  108 struct iconv_functions *udf_iconv = NULL;
  109 
  110 /* Zones */
  111 uma_zone_t udf_zone_trans = NULL;
  112 uma_zone_t udf_zone_node = NULL;
  113 uma_zone_t udf_zone_ds = NULL;
  114 
  115 static vfs_init_t      udf_init;
  116 static vfs_uninit_t    udf_uninit;
  117 static vfs_mount_t     udf_mount;
  118 static vfs_root_t      udf_root;
  119 static vfs_statfs_t    udf_statfs;
  120 static vfs_unmount_t   udf_unmount;
  121 static vfs_fhtovp_t     udf_fhtovp;
  122 
  123 static int udf_find_partmaps(struct udf_mnt *, struct logvol_desc *);
  124 
  125 static struct vfsops udf_vfsops = {
  126         .vfs_fhtovp =           udf_fhtovp,
  127         .vfs_init =             udf_init,
  128         .vfs_mount =            udf_mount,
  129         .vfs_root =             udf_root,
  130         .vfs_statfs =           udf_statfs,
  131         .vfs_uninit =           udf_uninit,
  132         .vfs_unmount =          udf_unmount,
  133         .vfs_vget =             udf_vget,
  134 };
  135 VFS_SET(udf_vfsops, udf, VFCF_READONLY);
  136 
  137 MODULE_VERSION(udf, 1);
  138 
  139 static int udf_mountfs(struct vnode *, struct mount *);
  140 
  141 static int
  142 udf_init(struct vfsconf *foo)
  143 {
  144 
  145         /*
  146          * This code used to pre-allocate a certain number of pages for each
  147          * pool, reducing the need to grow the zones later on.  UMA doesn't
  148          * advertise any such functionality, unfortunately =-<
  149          */
  150         udf_zone_trans = uma_zcreate("UDF translation buffer, zone", MAXNAMLEN *
  151             sizeof(unicode_t), NULL, NULL, NULL, NULL, 0, 0);
  152 
  153         udf_zone_node = uma_zcreate("UDF Node zone", sizeof(struct udf_node),
  154             NULL, NULL, NULL, NULL, 0, 0);
  155 
  156         udf_zone_ds = uma_zcreate("UDF Dirstream zone",
  157             sizeof(struct udf_dirstream), NULL, NULL, NULL, NULL, 0, 0);
  158 
  159         if ((udf_zone_node == NULL) || (udf_zone_trans == NULL) ||
  160             (udf_zone_ds == NULL)) {
  161                 printf("Cannot create allocation zones.\n");
  162                 return (ENOMEM);
  163         }
  164 
  165         return 0;
  166 }
  167 
  168 static int
  169 udf_uninit(struct vfsconf *foo)
  170 {
  171 
  172         if (udf_zone_trans != NULL) {
  173                 uma_zdestroy(udf_zone_trans);
  174                 udf_zone_trans = NULL;
  175         }
  176 
  177         if (udf_zone_node != NULL) {
  178                 uma_zdestroy(udf_zone_node);
  179                 udf_zone_node = NULL;
  180         }
  181 
  182         if (udf_zone_ds != NULL) {
  183                 uma_zdestroy(udf_zone_ds);
  184                 udf_zone_ds = NULL;
  185         }
  186 
  187         return (0);
  188 }
  189 
  190 static int
  191 udf_mount(struct mount *mp)
  192 {
  193         struct vnode *devvp;    /* vnode of the mount device */
  194         struct thread *td;
  195         struct udf_mnt *imp = NULL;
  196         struct vfsoptlist *opts;
  197         char *fspec, *cs_disk, *cs_local;
  198         int error, len, *udf_flags;
  199         struct nameidata nd, *ndp = &nd;
  200 
  201         td = curthread;
  202         opts = mp->mnt_optnew;
  203 
  204         /*
  205          * Unconditionally mount as read-only.
  206          */
  207         MNT_ILOCK(mp);
  208         mp->mnt_flag |= MNT_RDONLY;
  209         MNT_IUNLOCK(mp);
  210 
  211         /*
  212          * No root filesystem support.  Probably not a big deal, since the
  213          * bootloader doesn't understand UDF.
  214          */
  215         if (mp->mnt_flag & MNT_ROOTFS)
  216                 return (ENOTSUP);
  217 
  218         fspec = NULL;
  219         error = vfs_getopt(opts, "from", (void **)&fspec, &len);
  220         if (!error && fspec[len - 1] != '\0')
  221                 return (EINVAL);
  222 
  223         if (mp->mnt_flag & MNT_UPDATE) {
  224                 return (0);
  225         }
  226 
  227         /* Check that the mount device exists */
  228         if (fspec == NULL)
  229                 return (EINVAL);
  230         NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec);
  231         if ((error = namei(ndp)))
  232                 return (error);
  233         NDFREE_PNBUF(ndp);
  234         devvp = ndp->ni_vp;
  235 
  236         if (!vn_isdisk_error(devvp, &error)) {
  237                 vput(devvp);
  238                 return (error);
  239         }
  240 
  241         /* Check the access rights on the mount device */
  242         error = VOP_ACCESS(devvp, VREAD, td->td_ucred, td);
  243         if (error)
  244                 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
  245         if (error) {
  246                 vput(devvp);
  247                 return (error);
  248         }
  249 
  250         if ((error = udf_mountfs(devvp, mp))) {
  251                 vrele(devvp);
  252                 return (error);
  253         }
  254 
  255         imp = VFSTOUDFFS(mp);
  256 
  257         udf_flags = NULL;
  258         error = vfs_getopt(opts, "flags", (void **)&udf_flags, &len);
  259         if (error || len != sizeof(int))
  260                 return (EINVAL);
  261         imp->im_flags = *udf_flags;
  262 
  263         if (imp->im_flags & UDFMNT_KICONV && udf_iconv) {
  264                 cs_disk = NULL;
  265                 error = vfs_getopt(opts, "cs_disk", (void **)&cs_disk, &len);
  266                 if (!error && cs_disk[len - 1] != '\0')
  267                         return (EINVAL);
  268                 cs_local = NULL;
  269                 error = vfs_getopt(opts, "cs_local", (void **)&cs_local, &len);
  270                 if (!error && cs_local[len - 1] != '\0')
  271                         return (EINVAL);
  272                 udf_iconv->open(cs_local, cs_disk, &imp->im_d2l);
  273 #if 0
  274                 udf_iconv->open(cs_disk, cs_local, &imp->im_l2d);
  275 #endif
  276         }
  277 
  278         vfs_mountedfrom(mp, fspec);
  279         return 0;
  280 };
  281 
  282 /*
  283  * Check the descriptor tag for both the correct id and correct checksum.
  284  * Return zero if all is good, EINVAL if not.
  285  */
  286 int
  287 udf_checktag(struct desc_tag *tag, uint16_t id)
  288 {
  289         uint8_t *itag;
  290         uint8_t i, cksum = 0;
  291 
  292         itag = (uint8_t *)tag;
  293 
  294         if (le16toh(tag->id) != id)
  295                 return (EINVAL);
  296 
  297         for (i = 0; i < 16; i++)
  298                 cksum = cksum + itag[i];
  299         cksum = cksum - itag[4];
  300 
  301         if (cksum == tag->cksum)
  302                 return (0);
  303 
  304         return (EINVAL);
  305 }
  306 
  307 static int
  308 udf_mountfs(struct vnode *devvp, struct mount *mp)
  309 {
  310         struct buf *bp = NULL;
  311         struct cdev *dev;
  312         struct anchor_vdp avdp;
  313         struct udf_mnt *udfmp = NULL;
  314         struct part_desc *pd;
  315         struct logvol_desc *lvd;
  316         struct fileset_desc *fsd;
  317         struct file_entry *root_fentry;
  318         uint32_t sector, size, mvds_start, mvds_end;
  319         uint32_t logical_secsize;
  320         uint32_t fsd_offset = 0;
  321         uint16_t part_num = 0, fsd_part = 0;
  322         int error = EINVAL;
  323         int logvol_found = 0, part_found = 0, fsd_found = 0;
  324         int bsize;
  325         struct g_consumer *cp;
  326         struct bufobj *bo;
  327 
  328         dev = devvp->v_rdev;
  329         dev_ref(dev);
  330         g_topology_lock();
  331         error = g_vfs_open(devvp, &cp, "udf", 0);
  332         g_topology_unlock();
  333         VOP_UNLOCK(devvp);
  334         if (error)
  335                 goto bail;
  336 
  337         bo = &devvp->v_bufobj;
  338 
  339         if (devvp->v_rdev->si_iosize_max != 0)
  340                 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
  341         if (mp->mnt_iosize_max > maxphys)
  342                 mp->mnt_iosize_max = maxphys;
  343 
  344         /* XXX: should be M_WAITOK */
  345         udfmp = malloc(sizeof(struct udf_mnt), M_UDFMOUNT,
  346             M_NOWAIT | M_ZERO);
  347         if (udfmp == NULL) {
  348                 printf("Cannot allocate UDF mount struct\n");
  349                 error = ENOMEM;
  350                 goto bail;
  351         }
  352 
  353         mp->mnt_data = udfmp;
  354         mp->mnt_stat.f_fsid.val[0] = dev2udev(devvp->v_rdev);
  355         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  356         MNT_ILOCK(mp);
  357         mp->mnt_flag |= MNT_LOCAL;
  358         mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED;
  359         MNT_IUNLOCK(mp);
  360         udfmp->im_mountp = mp;
  361         udfmp->im_dev = dev;
  362         udfmp->im_devvp = devvp;
  363         udfmp->im_d2l = NULL;
  364         udfmp->im_cp = cp;
  365         udfmp->im_bo = bo;
  366 
  367 #if 0
  368         udfmp->im_l2d = NULL;
  369 #endif
  370         /*
  371          * The UDF specification defines a logical sectorsize of 2048
  372          * for DVD media.
  373          */
  374         logical_secsize = 2048;
  375 
  376         if (((logical_secsize % cp->provider->sectorsize) != 0) ||
  377             (logical_secsize < cp->provider->sectorsize)) {
  378                 error = EINVAL;
  379                 goto bail;
  380         }
  381 
  382         bsize = cp->provider->sectorsize;
  383 
  384         /* 
  385          * Get the Anchor Volume Descriptor Pointer from sector 256.
  386          * XXX Should also check sector n - 256, n, and 512.
  387          */
  388         sector = 256;
  389         if ((error = bread(devvp, sector * btodb(logical_secsize), bsize,
  390                            NOCRED, &bp)) != 0)
  391                 goto bail;
  392         if ((error = udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR)))
  393                 goto bail;
  394 
  395         bcopy(bp->b_data, &avdp, sizeof(struct anchor_vdp));
  396         brelse(bp);
  397         bp = NULL;
  398 
  399         /*
  400          * Extract the Partition Descriptor and Logical Volume Descriptor
  401          * from the Volume Descriptor Sequence.
  402          * XXX Should we care about the partition type right now?
  403          * XXX What about multiple partitions?
  404          */
  405         mvds_start = le32toh(avdp.main_vds_ex.loc);
  406         mvds_end = mvds_start + (le32toh(avdp.main_vds_ex.len) - 1) / bsize;
  407         for (sector = mvds_start; sector < mvds_end; sector++) {
  408                 if ((error = bread(devvp, sector * btodb(logical_secsize),
  409                                    bsize, NOCRED, &bp)) != 0) {
  410                         printf("Can't read sector %d of VDS\n", sector);
  411                         goto bail;
  412                 }
  413                 lvd = (struct logvol_desc *)bp->b_data;
  414                 if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) {
  415                         udfmp->bsize = le32toh(lvd->lb_size);
  416                         udfmp->bmask = udfmp->bsize - 1;
  417                         udfmp->bshift = ffs(udfmp->bsize) - 1;
  418                         fsd_part = le16toh(lvd->_lvd_use.fsd_loc.loc.part_num);
  419                         fsd_offset = le32toh(lvd->_lvd_use.fsd_loc.loc.lb_num);
  420                         if (udf_find_partmaps(udfmp, lvd))
  421                                 break;
  422                         logvol_found = 1;
  423                 }
  424                 pd = (struct part_desc *)bp->b_data;
  425                 if (!udf_checktag(&pd->tag, TAGID_PARTITION)) {
  426                         part_found = 1;
  427                         part_num = le16toh(pd->part_num);
  428                         udfmp->part_len = le32toh(pd->part_len);
  429                         udfmp->part_start = le32toh(pd->start_loc);
  430                 }
  431 
  432                 brelse(bp); 
  433                 bp = NULL;
  434                 if ((part_found) && (logvol_found))
  435                         break;
  436         }
  437 
  438         if (!part_found || !logvol_found) {
  439                 error = EINVAL;
  440                 goto bail;
  441         }
  442 
  443         if (fsd_part != part_num) {
  444                 printf("FSD does not lie within the partition!\n");
  445                 error = EINVAL;
  446                 goto bail;
  447         }
  448 
  449         /*
  450          * Grab the Fileset Descriptor
  451          * Thanks to Chuck McCrobie <mccrobie@cablespeed.com> for pointing
  452          * me in the right direction here.
  453          */
  454         sector = udfmp->part_start + fsd_offset;
  455         if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) {
  456                 printf("Cannot read sector %d of FSD\n", sector);
  457                 goto bail;
  458         }
  459         fsd = (struct fileset_desc *)bp->b_data;
  460         if (!udf_checktag(&fsd->tag, TAGID_FSD)) {
  461                 fsd_found = 1;
  462                 bcopy(&fsd->rootdir_icb, &udfmp->root_icb,
  463                     sizeof(struct long_ad));
  464         }
  465 
  466         brelse(bp);
  467         bp = NULL;
  468 
  469         if (!fsd_found) {
  470                 printf("Couldn't find the fsd\n");
  471                 error = EINVAL;
  472                 goto bail;
  473         }
  474 
  475         /*
  476          * Find the file entry for the root directory.
  477          */
  478         sector = le32toh(udfmp->root_icb.loc.lb_num) + udfmp->part_start;
  479         size = le32toh(udfmp->root_icb.len);
  480         if ((error = udf_readdevblks(udfmp, sector, size, &bp)) != 0) {
  481                 printf("Cannot read sector %d\n", sector);
  482                 goto bail;
  483         }
  484 
  485         root_fentry = (struct file_entry *)bp->b_data;
  486         if ((error = udf_checktag(&root_fentry->tag, TAGID_FENTRY))) {
  487                 printf("Invalid root file entry!\n");
  488                 goto bail;
  489         }
  490 
  491         brelse(bp);
  492         bp = NULL;
  493 
  494         return 0;
  495 
  496 bail:
  497         if (udfmp != NULL)
  498                 free(udfmp, M_UDFMOUNT);
  499         if (bp != NULL)
  500                 brelse(bp);
  501         if (cp != NULL) {
  502                 g_topology_lock();
  503                 g_vfs_close(cp);
  504                 g_topology_unlock();
  505         }
  506         dev_rel(dev);
  507         return error;
  508 };
  509 
  510 static int
  511 udf_unmount(struct mount *mp, int mntflags)
  512 {
  513         struct udf_mnt *udfmp;
  514         int error, flags = 0;
  515 
  516         udfmp = VFSTOUDFFS(mp);
  517 
  518         if (mntflags & MNT_FORCE)
  519                 flags |= FORCECLOSE;
  520 
  521         if ((error = vflush(mp, 0, flags, curthread)))
  522                 return (error);
  523 
  524         if (udfmp->im_flags & UDFMNT_KICONV && udf_iconv) {
  525                 if (udfmp->im_d2l)
  526                         udf_iconv->close(udfmp->im_d2l);
  527 #if 0
  528                 if (udfmp->im_l2d)
  529                         udf_iconv->close(udfmp->im_l2d);
  530 #endif
  531         }
  532 
  533         g_topology_lock();
  534         g_vfs_close(udfmp->im_cp);
  535         g_topology_unlock();
  536         vrele(udfmp->im_devvp);
  537         dev_rel(udfmp->im_dev);
  538 
  539         if (udfmp->s_table != NULL)
  540                 free(udfmp->s_table, M_UDFMOUNT);
  541 
  542         free(udfmp, M_UDFMOUNT);
  543 
  544         mp->mnt_data = NULL;
  545         return (0);
  546 }
  547 
  548 static int
  549 udf_root(struct mount *mp, int flags, struct vnode **vpp)
  550 {
  551         struct udf_mnt *udfmp;
  552         ino_t id;
  553 
  554         udfmp = VFSTOUDFFS(mp);
  555 
  556         id = udf_getid(&udfmp->root_icb);
  557 
  558         return (udf_vget(mp, id, flags, vpp));
  559 }
  560 
  561 static int
  562 udf_statfs(struct mount *mp, struct statfs *sbp)
  563 {
  564         struct udf_mnt *udfmp;
  565 
  566         udfmp = VFSTOUDFFS(mp);
  567 
  568         sbp->f_bsize = udfmp->bsize;
  569         sbp->f_iosize = udfmp->bsize;
  570         sbp->f_blocks = udfmp->part_len;
  571         sbp->f_bfree = 0;
  572         sbp->f_bavail = 0;
  573         sbp->f_files = 0;
  574         sbp->f_ffree = 0;
  575         return 0;
  576 }
  577 
  578 int
  579 udf_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
  580 {
  581         struct buf *bp;
  582         struct vnode *devvp;
  583         struct udf_mnt *udfmp;
  584         struct thread *td;
  585         struct vnode *vp;
  586         struct udf_node *unode;
  587         struct file_entry *fe;
  588         uint32_t lea, lad;
  589         int error, sector, size;
  590 
  591         error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL);
  592         if (error || *vpp != NULL)
  593                 return (error);
  594 
  595         /*
  596          * We must promote to an exclusive lock for vnode creation.  This
  597          * can happen if lookup is passed LOCKSHARED.
  598          */
  599         if ((flags & LK_TYPE_MASK) == LK_SHARED) {
  600                 flags &= ~LK_TYPE_MASK;
  601                 flags |= LK_EXCLUSIVE;
  602         }
  603 
  604         /*
  605          * We do not lock vnode creation as it is believed to be too
  606          * expensive for such rare case as simultaneous creation of vnode
  607          * for same ino by different processes. We just allow them to race
  608          * and check later to decide who wins. Let the race begin!
  609          */
  610 
  611         td = curthread;
  612         udfmp = VFSTOUDFFS(mp);
  613 
  614         unode = uma_zalloc(udf_zone_node, M_WAITOK | M_ZERO);
  615 
  616         if ((error = udf_allocv(mp, &vp, td))) {
  617                 printf("Error from udf_allocv\n");
  618                 uma_zfree(udf_zone_node, unode);
  619                 return (error);
  620         }
  621 
  622         unode->i_vnode = vp;
  623         unode->hash_id = ino;
  624         unode->udfmp = udfmp;
  625         vp->v_data = unode;
  626 
  627         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  628         error = insmntque(vp, mp);
  629         if (error != 0) {
  630                 uma_zfree(udf_zone_node, unode);
  631                 return (error);
  632         }
  633         error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
  634         if (error || *vpp != NULL)
  635                 return (error);
  636 
  637         /*
  638          * Copy in the file entry.  Per the spec, the size can only be 1 block.
  639          */
  640         sector = ino + udfmp->part_start;
  641         devvp = udfmp->im_devvp;
  642         if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) {
  643                 printf("Cannot read sector %d\n", sector);
  644                 goto error;
  645         }
  646 
  647         /*
  648          * File entry length validation.
  649          */
  650         fe = (struct file_entry *)bp->b_data;
  651         if (udf_checktag(&fe->tag, TAGID_FENTRY)) {
  652                 printf("Invalid file entry!\n");
  653                 error = ENOMEM;
  654                 goto error;
  655         }
  656         lea = le32toh(fe->l_ea);
  657         lad = le32toh(fe->l_ad);
  658         if (lea > udfmp->bsize || lad > udfmp->bsize) {
  659                 printf("Invalid EA and AD lengths %u, %u\n", lea, lad);
  660                 error = EIO;
  661                 goto error;
  662         }
  663         size = UDF_FENTRY_SIZE + lea + lad;
  664         if (size > udfmp->bsize) {
  665                 printf("Invalid file entry size %u\n", size);
  666                 error = EIO;
  667                 goto error;
  668         }
  669 
  670         unode->fentry = malloc(size, M_UDFFENTRY, M_NOWAIT | M_ZERO);
  671         if (unode->fentry == NULL) {
  672                 printf("Cannot allocate file entry block\n");
  673                 error = ENOMEM;
  674                 goto error;
  675         }
  676 
  677         bcopy(bp->b_data, unode->fentry, size);
  678 
  679         brelse(bp);
  680         bp = NULL;
  681 
  682         switch (unode->fentry->icbtag.file_type) {
  683         default:
  684                 vp->v_type = VBAD;
  685                 break;
  686         case 4:
  687                 vp->v_type = VDIR;
  688                 break;
  689         case 5:
  690                 vp->v_type = VREG;
  691                 break;
  692         case 6:
  693                 vp->v_type = VBLK;
  694                 break;
  695         case 7:
  696                 vp->v_type = VCHR;
  697                 break;
  698         case 9:
  699                 vp->v_type = VFIFO;
  700                 vp->v_op = &udf_fifoops;
  701                 break;
  702         case 10:
  703                 vp->v_type = VSOCK;
  704                 break;
  705         case 12:
  706                 vp->v_type = VLNK;
  707                 break;
  708         }
  709 
  710         if (vp->v_type != VFIFO)
  711                 VN_LOCK_ASHARE(vp);
  712 
  713         if (ino == udf_getid(&udfmp->root_icb))
  714                 vp->v_vflag |= VV_ROOT;
  715 
  716         vn_set_state(vp, VSTATE_CONSTRUCTED);
  717         *vpp = vp;
  718 
  719         return (0);
  720 
  721 error:
  722         vgone(vp);
  723         vput(vp);
  724         brelse(bp);
  725         *vpp = NULL;
  726         return (error);
  727 }
  728 
  729 static int
  730 udf_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
  731 {
  732         struct ifid *ifhp;
  733         struct vnode *nvp;
  734         struct udf_node *np;
  735         off_t fsize;
  736         int error;
  737 
  738         ifhp = (struct ifid *)fhp;
  739 
  740         if ((error = VFS_VGET(mp, ifhp->ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
  741                 *vpp = NULLVP;
  742                 return (error);
  743         }
  744 
  745         np = VTON(nvp);
  746         fsize = le64toh(np->fentry->inf_len);
  747 
  748         *vpp = nvp;
  749         vnode_create_vobject(*vpp, fsize, curthread);
  750         return (0);
  751 }
  752 
  753 static int
  754 udf_find_partmaps(struct udf_mnt *udfmp, struct logvol_desc *lvd)
  755 {
  756         struct part_map_spare *pms;
  757         struct regid *pmap_id;
  758         struct buf *bp;
  759         unsigned char regid_id[UDF_REGID_ID_SIZE + 1];
  760         int i, k, ptype, psize, error;
  761         uint8_t *pmap = (uint8_t *) &lvd->maps[0];
  762 
  763         for (i = 0; i < le32toh(lvd->n_pm); i++) {
  764                 ptype = pmap[0];
  765                 psize = pmap[1];
  766                 if (((ptype != 1) && (ptype != 2)) ||
  767                     ((psize != UDF_PMAP_TYPE1_SIZE) &&
  768                      (psize != UDF_PMAP_TYPE2_SIZE))) {
  769                         printf("Invalid partition map found\n");
  770                         return (1);
  771                 }
  772 
  773                 if (ptype == 1) {
  774                         /* Type 1 map.  We don't care */
  775                         pmap += UDF_PMAP_TYPE1_SIZE;
  776                         continue;
  777                 }
  778 
  779                 /* Type 2 map.  Gotta find out the details */
  780                 pmap_id = (struct regid *)&pmap[4];
  781                 bzero(&regid_id[0], UDF_REGID_ID_SIZE);
  782                 bcopy(&pmap_id->id[0], &regid_id[0], UDF_REGID_ID_SIZE);
  783 
  784                 if (bcmp(&regid_id[0], "*UDF Sparable Partition",
  785                     UDF_REGID_ID_SIZE)) {
  786                         printf("Unsupported partition map: %s\n", &regid_id[0]);
  787                         return (1);
  788                 }
  789 
  790                 pms = (struct part_map_spare *)pmap;
  791                 pmap += UDF_PMAP_TYPE2_SIZE;
  792                 udfmp->s_table = malloc(le32toh(pms->st_size),
  793                     M_UDFMOUNT, M_NOWAIT | M_ZERO);
  794                 if (udfmp->s_table == NULL)
  795                         return (ENOMEM);
  796 
  797                 /* Calculate the number of sectors per packet. */
  798                 /* XXX Logical or physical? */
  799                 udfmp->p_sectors = le16toh(pms->packet_len) / udfmp->bsize;
  800 
  801                 /*
  802                  * XXX If reading the first Sparing Table fails, should look
  803                  * for another table.
  804                  */
  805                 if ((error = udf_readdevblks(udfmp, le32toh(pms->st_loc[0]),
  806                                            le32toh(pms->st_size), &bp)) != 0) {
  807                         if (bp != NULL)
  808                                 brelse(bp);
  809                         printf("Failed to read Sparing Table at sector %d\n",
  810                             le32toh(pms->st_loc[0]));
  811                         free(udfmp->s_table, M_UDFMOUNT);
  812                         return (error);
  813                 }
  814                 bcopy(bp->b_data, udfmp->s_table, le32toh(pms->st_size));
  815                 brelse(bp);
  816 
  817                 if (udf_checktag(&udfmp->s_table->tag, 0)) {
  818                         printf("Invalid sparing table found\n");
  819                         free(udfmp->s_table, M_UDFMOUNT);
  820                         return (EINVAL);
  821                 }
  822 
  823                 /* See how many valid entries there are here.  The list is
  824                  * supposed to be sorted. 0xfffffff0 and higher are not valid
  825                  */
  826                 for (k = 0; k < le16toh(udfmp->s_table->rt_l); k++) {
  827                         udfmp->s_table_entries = k;
  828                         if (le32toh(udfmp->s_table->entries[k].org) >=
  829                             0xfffffff0)
  830                                 break;
  831                 }
  832         }
  833 
  834         return (0);
  835 }

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