Actually add the UDF files!

1 files changed, 744 insertions, 0 deletions

diff --git a/sys/fs/udf/udf_vfsops.c b/sys/fs/udf/udf_vfsops.c
new file mode 100644
index 0000000..aecb84c
--- /dev/null
+++ b/sys/fs/udf/udf_vfsops.c
@@ -0,0 +1,744 @@
+/*-
+ * Copyright (c) 2001, 2002 Scott Long <scottl@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/* udf_vfsops.c */
+/* Implement the VFS side of things */
+
+/*
+ * Ok, here's how it goes.  The UDF specs are pretty clear on how each data
+ * structure is made up, but not very clear on how they relate to each other.
+ * Here is the skinny... This demostrates a filesystem with one file in the
+ * root directory.  Subdirectories are treated just as normal files, but they
+ * have File Id Descriptors of their children as their file data.  As for the
+ * Anchor Volume Descriptor Pointer, it can exist in two of the following three
+ * places: sector 256, sector n (the max sector of the disk), or sector
+ * n - 256.  It's a pretty good bet that one will exist at sector 256 though.
+ * One caveat is unclosed CD media.  For that, sector 256 cannot be written,
+ * so the Anchor Volume Descriptor Pointer can exist at sector 512 until the
+ * media is closed.
+ *
+ *  Sector:
+ *     256:
+ *       n: Anchor Volume Descriptor Pointer
+ * n - 256:	|
+ *		|
+ *		|-->Main Volume Descriptor Sequence
+ *			|	|
+ *			|	|
+ *			|	|-->Logical Volume Descriptor
+ *			|			  |
+ *			|-->Partition Descriptor  |
+ *				|		  |
+ *				|		  |
+ *				|-->Fileset Descriptor
+ *					|
+ *					|
+ *					|-->Root Dir File Entry
+ *						|
+ *						|
+ *						|-->File data:
+ *						    File Id Descriptor
+ *							|
+ *							|
+ *							|-->File Entry
+ *								|
+ *								|
+ *								|-->File data
+ */
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/namei.h>
+#include <sys/vnode.h>
+#include <sys/mount.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/fcntl.h>
+#include <sys/bio.h>
+#include <sys/buf.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+#include <sys/mount.h>
+#include <sys/conf.h>
+#include <sys/queue.h>
+#include <sys/dirent.h>
+
+#include <vm/uma.h>
+
+#include <fs/udf/ecma167-udf.h>
+#include <fs/udf/udf.h>
+#include <fs/udf/udf_mount.h>
+#include <fs/udf/osta.h>
+
+MALLOC_DEFINE(M_UDFMOUNT, "UDF mount", "UDF mount structure");
+MALLOC_DEFINE(M_UDFFENTRY, "UDF fentry", "UDF file entry structure");
+MALLOC_DEFINE(M_UDFSTABLE, "UDF s_table", "UDF sparing table");
+
+/* Zones */
+uma_zone_t udf_zone_trans = NULL;
+uma_zone_t udf_zone_node = NULL;
+
+static int udf_init(struct vfsconf *);
+static int udf_uninit(struct vfsconf *);
+static int udf_mount(struct mount *, char *, caddr_t, struct nameidata *,
+		     struct thread *);
+static int udf_unmount(struct mount *, int, struct thread *);
+static int udf_root(struct mount *, struct vnode **);
+static int udf_statfs(struct mount *, struct statfs *, struct thread *);
+static int udf_fhtovp(struct mount *, struct fid *, struct vnode **);
+static int udf_vptofh(struct vnode *, struct fid *);
+static int udf_find_partmaps(struct udf_mnt *, struct logvol_desc *);
+
+static struct vfsops udf_vfsops = {
+	udf_mount,
+	vfs_stdstart,
+	udf_unmount,
+	udf_root,
+	vfs_stdquotactl,
+	udf_statfs,
+	vfs_stdsync,
+	udf_vget,
+	udf_fhtovp,
+	vfs_stdcheckexp,
+	udf_vptofh,
+	udf_init,
+	udf_uninit,
+	vfs_stdextattrctl,
+};
+VFS_SET(udf_vfsops, udf, VFCF_READONLY);
+
+static int udf_mountfs(struct vnode *, struct mount *, struct thread *, struct udf_args *);
+
+static int
+udf_init(struct vfsconf *foo)
+{
+
+	/*
+	 * This code used to pre-allocate a certain number of pages for each
+	 * pool, reducing the need to grow the zones later on.  UMA doesn't
+	 * advertise any such functionality, unfortunately =-<
+	 */
+	udf_zone_trans = uma_zcreate("UDF translation buffer, zone", MAXNAMLEN *
+	    sizeof(unicode_t), NULL, NULL, NULL, NULL, 0, 0);
+
+	udf_zone_node = uma_zcreate("UDF Node zone", sizeof(struct udf_node),
+	    NULL, NULL, NULL, NULL, 0, 0);
+
+	if ((udf_zone_node == NULL) || (udf_zone_trans == NULL)) {
+		printf("Cannot create allocation zones.\n");
+		return (ENOMEM);
+	}
+
+	return 0;
+}
+
+static int
+udf_uninit(struct vfsconf *foo)
+{
+
+	if (udf_zone_trans != NULL) {
+		uma_zdestroy(udf_zone_trans);
+		udf_zone_trans = NULL;
+	}
+
+	if (udf_zone_node != NULL) {
+		uma_zdestroy(udf_zone_node);
+		udf_zone_node = NULL;
+	}
+
+	return (0);
+}
+
+static int
+udf_mount(struct mount *mp, char *path, caddr_t data, struct nameidata *ndp, struct thread *td)
+{
+	struct vnode *devvp;	/* vnode of the mount device */
+	struct udf_args args;
+	struct udf_mnt *imp = 0;
+	size_t size;
+	int error;
+
+	if ((mp->mnt_flag & MNT_RDONLY) == 0)
+		return (EROFS);
+
+	/*
+	 * No root filesystem support.  Probably not a big deal, since the
+	 * bootloader doesn't understand UDF.
+	 */
+	if (mp->mnt_flag & MNT_ROOTFS)
+		return (ENOTSUP);
+
+	if ((error = copyin(data, (caddr_t)&args, sizeof(struct udf_args))))
+		return (error);
+
+	if (mp->mnt_flag & MNT_UPDATE) {
+		imp = VFSTOUDFFS(mp);
+		if (args.fspec == 0)
+			return (vfs_export(mp, &args.export));
+	}
+
+	/* Check that the mount device exists */
+	NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td);
+	if ((error = namei(ndp)))
+		return (error);
+	NDFREE(ndp, NDF_ONLY_PNBUF);
+	devvp = ndp->ni_vp;
+
+	if (vn_isdisk(devvp, &error) == 0) {
+		vrele(devvp);
+		return (error);
+	}
+
+	/* Check the access rights on the mount device */
+	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
+	error = VOP_ACCESS(devvp, VREAD, td->td_ucred, td);
+	if (error)
+		error = suser(td);
+	if (error) {
+		vput(devvp);
+		return (error);
+	}
+	VOP_UNLOCK(devvp, 0, td);
+
+	if ((error = udf_mountfs(devvp, mp, td, &args))) {
+		vrele(devvp);
+		return (error);
+	}
+
+	imp = VFSTOUDFFS(mp);
+	copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
+	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
+	udf_statfs(mp, &mp->mnt_stat, td);
+	return 0;
+};
+
+/*
+ * Check the descriptor tag for both the correct id and correct checksum.
+ * Return zero if all is good, EINVAL if not.
+ */
+int
+udf_checktag(struct desc_tag *tag, u_int16_t id)
+{
+	u_int8_t *itag;
+	u_int8_t i, cksum = 0;
+
+	itag = (u_int8_t *)tag;
+
+	if (tag->id != id)
+		return (EINVAL);
+
+	for (i = 0; i < 15; i++)
+		cksum = cksum + itag[i];
+	cksum = cksum - itag[4];
+
+	if (cksum == tag->cksum)
+		return (0);
+
+	return (EINVAL);
+}
+
+static int
+udf_mountfs(struct vnode *devvp, struct mount *mp, struct thread *td, struct udf_args *argp) {
+	struct buf *bp = NULL;
+	struct anchor_vdp avdp;
+	struct udf_mnt *udfmp = NULL;
+	struct part_desc *pd;
+	struct logvol_desc *lvd;
+	struct fileset_desc *fsd;
+	struct file_entry *root_fentry;
+	u_int32_t sector, size, mvds_start, mvds_end;
+	u_int32_t fsd_offset = 0;
+	u_int16_t part_num = 0, fsd_part = 0;
+	int error = EINVAL, needclose = 0;
+	int logvol_found = 0, part_found = 0, fsd_found = 0;
+	int bsize;
+
+	/*
+	 * Disallow multiple mounts of the same device. Flush the buffer
+	 * cache for the device.
+	 */
+	if ((error = vfs_mountedon(devvp)))
+		return (error);
+	if (vcount(devvp) > 1)
+		return (EBUSY);
+	if ((error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0)))
+		return (error);
+
+	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
+	error = VOP_OPEN(devvp, FREAD, FSCRED, td);
+	VOP_UNLOCK(devvp, 0, td);
+	if (error)
+		return error;
+	needclose = 1;
+
+	MALLOC(udfmp, struct udf_mnt *, sizeof(struct udf_mnt), M_UDFMOUNT,
+	    M_NOWAIT | M_ZERO);
+	if (udfmp == NULL) {
+		printf("Cannot allocate UDF mount struct\n");
+		error = ENOMEM;
+		goto bail;
+	}
+
+	mp->mnt_data = (qaddr_t)udfmp;
+	mp->mnt_stat.f_fsid.val[0] = dev2udev(devvp->v_rdev);
+	mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
+	mp->mnt_flag |= MNT_LOCAL;
+	udfmp->im_mountp = mp;
+	udfmp->im_dev = devvp->v_rdev;
+	udfmp->im_devvp = devvp;
+
+	bsize = 2048;	/* XXX Should probe the media for it's size */
+
+	/* 
+	 * Get the Anchor Volume Descriptor Pointer from sector 256.
+	 * XXX Should also check sector n - 256, n, and 512.
+	 */
+	sector = 256;
+	if ((error = bread(devvp, sector * btodb(bsize), bsize, NOCRED,
+			   &bp)) != 0)
+		goto bail;
+	if ((error = udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR)))
+		goto bail;
+
+	bcopy(bp->b_data, &avdp, sizeof(struct anchor_vdp));
+	brelse(bp);
+	bp = NULL;
+
+	/*
+	 * Extract the Partition Descriptor and Logical Volume Descriptor
+	 * from the Volume Descriptor Sequence.
+	 * XXX Should we care about the partition type right now?
+	 * XXX What about multiple partitions?
+	 */
+	mvds_start = avdp.main_vds_ex.loc;
+	mvds_end = mvds_start + (avdp.main_vds_ex.len - 1) / bsize;
+	for (sector = mvds_start; sector < mvds_end; sector++) {
+		if ((error = bread(devvp, sector * btodb(bsize), bsize, 
+				   NOCRED, &bp)) != 0) {
+			printf("Can't read sector %d of VDS\n", sector);
+			goto bail;
+		}
+		lvd = (struct logvol_desc *)bp->b_data;
+		if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) {
+			udfmp->bsize = lvd->lb_size;
+			udfmp->bmask = udfmp->bsize - 1;
+			udfmp->bshift = ffs(udfmp->bsize) - 1;
+			fsd_part = lvd->_lvd_use.fsd_loc.loc.part_num;
+			fsd_offset = lvd->_lvd_use.fsd_loc.loc.lb_num;
+			if (udf_find_partmaps(udfmp, lvd))
+				break;
+			logvol_found = 1;
+		}
+		pd = (struct part_desc *)bp->b_data;
+		if (!udf_checktag(&pd->tag, TAGID_PARTITION)) {
+			part_found = 1;
+			part_num = pd->part_num;
+			udfmp->part_len = pd->part_len;
+			udfmp->part_start = pd->start_loc;
+		}
+
+		brelse(bp); 
+		bp = NULL;
+		if ((part_found) && (logvol_found))
+			break;
+	}
+
+	if (!part_found || !logvol_found) {
+		error = EINVAL;
+		goto bail;
+	}
+
+	if (fsd_part != part_num) {
+		printf("FSD does not lie within the partition!\n");
+		error = EINVAL;
+		goto bail;
+	}
+
+
+	/*
+	 * Grab the Fileset Descriptor
+	 * Thanks to Chuck McCrobie <mccrobie@cablespeed.com> for pointing
+	 * me in the right direction here.
+	 */
+	sector = udfmp->part_start + fsd_offset;
+	if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) {
+		printf("Cannot read sector %d of FSD\n", sector);
+		goto bail;
+	}
+	fsd = (struct fileset_desc *)bp->b_data;
+	if (!udf_checktag(&fsd->tag, TAGID_FSD)) {
+		fsd_found = 1;
+		bcopy(&fsd->rootdir_icb, &udfmp->root_icb,
+		    sizeof(struct long_ad));
+	}
+
+	brelse(bp);
+	bp = NULL;
+
+	if (!fsd_found) {
+		printf("Couldn't find the fsd\n");
+		error = EINVAL;
+		goto bail;
+	}
+
+	/*
+	 * Find the file entry for the root directory.
+	 */
+	sector = udfmp->root_icb.loc.lb_num + udfmp->part_start;
+	size = udfmp->root_icb.len;
+	if ((error = udf_readlblks(udfmp, sector, size, &bp)) != 0) {
+		printf("Cannot read sector %d\n", sector);
+		goto bail;
+	}
+
+	root_fentry = (struct file_entry *)bp->b_data;
+	if ((error = udf_checktag(&root_fentry->tag, TAGID_FENTRY))) {
+		printf("Invalid root file entry!\n");
+		goto bail;
+	}
+
+	brelse(bp);
+	bp = NULL;
+
+	TAILQ_INIT(&udfmp->udf_tqh);
+	devvp->v_rdev->si_mountpoint = mp;
+
+	mtx_init(&udfmp->hash_mtx, "udf_hash", NULL, MTX_DEF);
+	return 0;
+
+bail:
+	if (udfmp != NULL)
+		FREE(udfmp, M_UDFMOUNT);
+	if (bp != NULL)
+		brelse(bp);
+	if (needclose)
+		VOP_CLOSE(devvp, FREAD, NOCRED, td);
+	return error;
+};
+
+static int
+udf_unmount(struct mount *mp, int mntflags, struct thread *td)
+{
+	struct udf_mnt *udfmp;
+	int error, flags = 0;
+
+	udfmp = VFSTOUDFFS(mp);
+
+	if (mntflags & MNT_FORCE)
+		flags |= FORCECLOSE;
+
+	if ((error = vflush(mp, 0, flags)))
+		return (error);
+
+	udfmp->im_devvp->v_rdev->si_mountpoint = NULL;
+	error = VOP_CLOSE(udfmp->im_devvp, FREAD, NOCRED, td);
+	vrele(udfmp->im_devvp);
+
+	if (udfmp->s_table != NULL)
+		FREE(udfmp->s_table, M_UDFSTABLE);
+	FREE(udfmp, M_UDFMOUNT);
+
+	mp->mnt_data = (qaddr_t)0;
+	mp->mnt_flag &= ~MNT_LOCAL;
+
+	return (0);
+}
+
+static int
+udf_root(struct mount *mp, struct vnode **vpp)
+{
+	struct udf_mnt *udfmp;
+	struct vnode *vp;
+	ino_t id;
+	int error;
+
+	udfmp = VFSTOUDFFS(mp);
+
+	id = udf_getid(&udfmp->root_icb);
+
+	error = udf_vget(mp, id, LK_EXCLUSIVE, vpp);
+	if (error)
+		return error;
+
+	vp = *vpp;
+	vp->v_flag |= VROOT;
+	udfmp->root_vp = vp;
+
+	return (0);
+}
+
+static int
+udf_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
+{
+	struct udf_mnt *udfmp;
+
+	udfmp = VFSTOUDFFS(mp);
+
+	sbp->f_bsize = udfmp->bsize;
+	sbp->f_iosize = udfmp->bsize;
+	sbp->f_blocks = udfmp->part_len;
+	sbp->f_bfree = 0;
+	sbp->f_bavail = 0;
+	sbp->f_files = 0;
+	sbp->f_ffree = 0;
+	if (sbp != &mp->mnt_stat) {
+		sbp->f_type = mp->mnt_vfc->vfc_typenum;
+		bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
+		bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
+	}
+
+	return 0;
+}
+
+int
+udf_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
+{
+	struct buf *bp;
+	struct vnode *devvp;
+	struct udf_mnt *udfmp;
+	struct thread *td;
+	struct vnode *vp;
+	struct udf_node *unode;
+	struct file_entry *fe;
+	int error, sector, size;
+
+	td = curthread;
+	udfmp = VFSTOUDFFS(mp);
+
+	/* See if we already have this in the cache */
+	if ((error = udf_hashlookup(udfmp, ino, flags, vpp)) != 0)
+		return (error);
+	if (*vpp != NULL) {
+		return (0);
+	}
+
+	/*
+	 * Allocate memory and check the tag id's before grabbing a new
+	 * vnode, since it's hard to roll back if there is a problem.
+	 */
+	unode = uma_zalloc(udf_zone_node, M_WAITOK);
+	if (unode == NULL) {
+		printf("Cannot allocate udf node\n");
+		return (ENOMEM);
+	}
+
+	/*
+	 * Copy in the file entry.  Per the spec, the size can only be 1 block.
+	 */
+	sector = ino + udfmp->part_start;
+	devvp = udfmp->im_devvp;
+	if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) {
+		printf("Cannot read sector %d\n", sector);
+		uma_zfree(udf_zone_node, unode);
+		return (error);
+	}
+
+	fe = (struct file_entry *)bp->b_data;
+	if (udf_checktag(&fe->tag, TAGID_FENTRY)) {
+		printf("Invalid file entry!\n");
+		uma_zfree(udf_zone_node, unode);
+		brelse(bp);
+		return (ENOMEM);
+	}
+	size = UDF_FENTRY_SIZE + fe->l_ea + fe->l_ad;
+	MALLOC(unode->fentry, struct file_entry *, size, M_UDFFENTRY,
+	    M_NOWAIT | M_ZERO);
+	if (unode->fentry == NULL) {
+		printf("Cannot allocate file entry block\n");
+		uma_zfree(udf_zone_node, unode);
+		brelse(bp);
+		return (ENOMEM);
+	}
+
+	bcopy(bp->b_data, unode->fentry, size);
+	
+	brelse(bp);
+	bp = NULL;
+
+	if ((error = udf_allocv(mp, &vp, td))) {
+		printf("Error from udf_allocv\n");
+		uma_zfree(udf_zone_node, unode);
+		return (error);
+	}
+
+	unode->i_vnode = vp;
+	unode->hash_id = ino;
+	unode->i_devvp = udfmp->im_devvp;
+	unode->i_dev = udfmp->im_dev;
+	unode->udfmp = udfmp;
+	vp->v_data = unode;
+	lockinit(&vp->v_lock, PINOD, "udfnode", 0, 0);
+	vp->v_vnlock = &vp->v_lock;
+	VREF(udfmp->im_devvp);
+	udf_hashins(unode);
+
+	switch (unode->fentry->icbtag.file_type) {
+	default:
+		vp->v_type = VBAD;
+		break;
+	case 4:
+		vp->v_type = VDIR;
+		break;
+	case 5:
+		vp->v_type = VREG;
+		break;
+	case 6:
+		vp->v_type = VBLK;
+		break;
+	case 7:
+		vp->v_type = VCHR;
+		break;
+	case 9:
+		vp->v_type = VFIFO;
+		break;
+	case 10:
+		vp->v_type = VSOCK;
+		break;
+	case 12:
+		vp->v_type = VLNK;
+		break;
+	}
+	*vpp = vp;
+
+	return (0);
+}
+
+struct ifid {
+	ushort	ifid_len;
+	ushort	ifid_pad;
+	int	ifid_ino;
+	long	ifid_start;
+};
+
+static int
+udf_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
+{
+	struct ifid *ifhp;
+	struct vnode *nvp;
+	int error;
+
+	ifhp = (struct ifid *)fhp;
+
+	if ((error = VFS_VGET(mp, ifhp->ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
+		*vpp = NULLVP;
+		return (error);
+	}
+
+	*vpp = nvp;
+	return (0);
+}
+
+static int
+udf_vptofh (struct vnode *vp, struct fid *fhp)
+{
+	struct udf_node *node;
+	struct ifid *ifhp;
+
+	node = VTON(vp);
+	ifhp = (struct ifid *)fhp;
+	ifhp->ifid_len = sizeof(struct ifid);
+	ifhp->ifid_ino = node->hash_id;
+
+	return (0);
+}
+
+static int
+udf_find_partmaps(struct udf_mnt *udfmp, struct logvol_desc *lvd)
+{
+	union udf_pmap *pmap;
+	struct part_map_spare *pms;
+	struct regid *pmap_id;
+	struct buf *bp;
+	unsigned char regid_id[UDF_REGID_ID_SIZE + 1];
+	int i, ptype, psize, error;
+
+	for (i = 0; i < lvd->n_pm; i++) {
+		pmap = (union udf_pmap *)&lvd->maps[i * UDF_PMAP_SIZE];
+		ptype = pmap->data[0];
+		psize = pmap->data[1];
+		if (((ptype != 1) && (ptype != 2)) ||
+		    ((psize != UDF_PMAP_SIZE) && (psize != 6))) {
+			printf("Invalid partition map found\n");
+			return (1);
+		}
+
+		if (ptype == 1) {
+			/* Type 1 map.  We don't care */
+			continue;
+		}
+
+		/* Type 2 map.  Gotta find out the details */
+		pmap_id = (struct regid *)&pmap->data[4];
+		bzero(&regid_id[0], UDF_REGID_ID_SIZE);
+		bcopy(&pmap_id->id[0], &regid_id[0], UDF_REGID_ID_SIZE);
+
+		if (bcmp(&regid_id[0], "*UDF Sparable Partition",
+		    UDF_REGID_ID_SIZE)) {
+			printf("Unsupported partition map: %s\n", &regid_id[0]);
+			return (1);
+		}
+
+		pms = &pmap->pms;
+		MALLOC(udfmp->s_table, struct udf_sparing_table *, pms->st_size,
+		    M_UDFSTABLE, M_NOWAIT | M_ZERO);
+		if (udfmp->s_table == NULL)
+			return (ENOMEM);
+
+		/* Calculate the number of sectors per packet. */
+		/* XXX Logical or physical? */
+		udfmp->p_sectors = pms->packet_len / udfmp->bsize;
+
+		/*
+		 * XXX If reading the first Sparing Table fails, should look
+		 * for another table.
+		 */
+		if ((error = udf_readlblks(udfmp, pms->st_loc[0], pms->st_size,
+		    &bp)) != 0) {
+			printf("Failed to read Sparing Table at sector %d\n",
+			    pms->st_loc[0]);
+			return (error);
+		}
+		bcopy(bp->b_data, udfmp->s_table, pms->st_size);
+		brelse(bp);
+
+		if (udf_checktag(&udfmp->s_table->tag, 0)) {
+			printf("Invalid sparing table found\n");
+			return (EINVAL);
+		}
+
+		/* See how many valid entries there are here.  The list is
+		 * supposed to be sorted. 0xfffffff0 and higher are not valid
+		 */
+		for (i = 0; i < udfmp->s_table->rt_l; i++) {
+			udfmp->s_table_entries = i;
+			if (udfmp->s_table->entries[i].org >= 0xfffffff0)
+				break;
+		}
+	}
+
+	return (0);
+}