support for mount by label (not yet tested)
Also adds findfs applet. Closes bug 1143.
This commit is contained in:
Denis Vlasenko
172
util-linux/volume_id/udf.c
Normal file
172
util-linux/volume_id/udf.c
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@@ -0,0 +1,172 @@
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/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "volume_id_internal.h"
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struct volume_descriptor {
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struct descriptor_tag {
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uint16_t id;
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uint16_t version;
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uint8_t checksum;
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uint8_t reserved;
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uint16_t serial;
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uint16_t crc;
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uint16_t crc_len;
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uint32_t location;
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} __attribute__((__packed__)) tag;
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union {
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struct anchor_descriptor {
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uint32_t length;
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uint32_t location;
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} __attribute__((__packed__)) anchor;
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struct primary_descriptor {
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uint32_t seq_num;
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uint32_t desc_num;
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struct dstring {
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uint8_t clen;
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uint8_t c[31];
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} __attribute__((__packed__)) ident;
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} __attribute__((__packed__)) primary;
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} __attribute__((__packed__)) type;
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} __attribute__((__packed__));
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struct volume_structure_descriptor {
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uint8_t type;
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uint8_t id[5];
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uint8_t version;
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} __attribute__((__packed__));
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#define UDF_VSD_OFFSET 0x8000
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int volume_id_probe_udf(struct volume_id *id, uint64_t off)
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{
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struct volume_descriptor *vd;
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struct volume_structure_descriptor *vsd;
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unsigned bs;
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unsigned b;
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unsigned type;
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unsigned count;
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unsigned loc;
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unsigned clen;
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dbg("probing at offset 0x%llx", (unsigned long long) off);
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vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200);
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if (vsd == NULL)
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return -1;
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if (memcmp(vsd->id, "NSR02", 5) == 0)
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goto blocksize;
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if (memcmp(vsd->id, "NSR03", 5) == 0)
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goto blocksize;
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if (memcmp(vsd->id, "BEA01", 5) == 0)
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goto blocksize;
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if (memcmp(vsd->id, "BOOT2", 5) == 0)
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goto blocksize;
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if (memcmp(vsd->id, "CD001", 5) == 0)
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goto blocksize;
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if (memcmp(vsd->id, "CDW02", 5) == 0)
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goto blocksize;
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if (memcmp(vsd->id, "TEA03", 5) == 0)
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goto blocksize;
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return -1;
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blocksize:
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/* search the next VSD to get the logical block size of the volume */
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for (bs = 0x800; bs < 0x8000; bs += 0x800) {
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vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800);
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if (vsd == NULL)
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return -1;
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dbg("test for blocksize: 0x%x", bs);
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if (vsd->id[0] != '\0')
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goto nsr;
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}
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return -1;
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nsr:
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/* search the list of VSDs for a NSR descriptor */
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for (b = 0; b < 64; b++) {
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vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800);
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if (vsd == NULL)
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return -1;
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dbg("vsd: %c%c%c%c%c",
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vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]);
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if (vsd->id[0] == '\0')
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return -1;
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if (memcmp(vsd->id, "NSR02", 5) == 0)
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goto anchor;
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if (memcmp(vsd->id, "NSR03", 5) == 0)
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goto anchor;
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}
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return -1;
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anchor:
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/* read anchor volume descriptor */
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vd = volume_id_get_buffer(id, off + (256 * bs), 0x200);
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if (vd == NULL)
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return -1;
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type = le16_to_cpu(vd->tag.id);
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if (type != 2) /* TAG_ID_AVDP */
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goto found;
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/* get desriptor list address and block count */
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count = le32_to_cpu(vd->type.anchor.length) / bs;
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loc = le32_to_cpu(vd->type.anchor.location);
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dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);
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/* pick the primary descriptor from the list */
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for (b = 0; b < count; b++) {
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vd = volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200);
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if (vd == NULL)
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return -1;
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type = le16_to_cpu(vd->tag.id);
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dbg("descriptor type %i", type);
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/* check validity */
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if (type == 0)
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goto found;
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if (le32_to_cpu(vd->tag.location) != loc + b)
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goto found;
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if (type == 1) /* TAG_ID_PVD */
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goto pvd;
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}
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goto found;
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pvd:
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volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32);
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clen = vd->type.primary.ident.clen;
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dbg("label string charsize=%i bit", clen);
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if (clen == 8)
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volume_id_set_label_string(id, vd->type.primary.ident.c, 31);
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else if (clen == 16)
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volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE, 31);
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found:
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volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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id->type = "udf";
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return 0;
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}
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