* the e2fsprogs. This is a simple straightforward implementation for
* reading the label strings of only the most common filesystems.
* If you need a full featured library with attribute caching, support for
- * much more partition/media types or non-root data access, you may have
+ * much more partition/media types or non-root disk access, you may have
* a look at:
* http://e2fsprogs.sourceforge.net.
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation version 2 of the License.
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "volume_id.h"
+#ifdef DEBUG
+#define dbg(format, arg...) \
+ do { \
+ printf("%s: " format "\n", __FUNCTION__ , ## arg); \
+ } while (0)
+#else
+#define dbg(format, arg...) do {} while (0)
+#endif
+
+#define bswap16(x) (__u16)((((__u16)(x) & 0x00ffu) << 8) | \
+ (((__u32)(x) & 0xff00u) >> 8))
#define bswap32(x) (__u32)((((__u32)(x) & 0xff000000u) >> 24) | \
(((__u32)(x) & 0x00ff0000u) >> 8) | \
(((__u32)(x) & 0x0000ff00u) << 8) | \
(((__u32)(x) & 0x000000ffu) << 24))
+#define bswap64(x) (__u64)((((__u64)(x) & 0xff00000000000000u) >> 56) | \
+ (((__u64)(x) & 0x00ff000000000000u) >> 40) | \
+ (((__u64)(x) & 0x0000ff0000000000u) >> 24) | \
+ (((__u64)(x) & 0x000000ff00000000u) >> 8) | \
+ (((__u64)(x) & 0x00000000ff000000u) << 8) | \
+ (((__u64)(x) & 0x0000000000ff0000u) << 24) | \
+ (((__u64)(x) & 0x000000000000ff00u) << 40) | \
+ (((__u64)(x) & 0x00000000000000ffu) << 56))
+
#if (__BYTE_ORDER == __LITTLE_ENDIAN)
-#define cpu_to_le32(x) (x)
+#define le16_to_cpu(x) (x)
+#define le32_to_cpu(x) (x)
+#define le64_to_cpu(x) (x)
#elif (__BYTE_ORDER == __BIG_ENDIAN)
-#define cpu_to_le32(x) bswap32(x)
+#define le16_to_cpu(x) bswap16(x)
+#define le32_to_cpu(x) bswap32(x)
+#define le64_to_cpu(x) bswap64(x)
#endif
-#define VOLUME_ID_BUFFER_SIZE 0x11000 /* reiser offset is 64k */
+/* size of superblock buffer, reiser block is at 64k */
+#define SB_BUFFER_SIZE 0x11000
+/* size of seek buffer 2k */
+#define SEEK_BUFFER_SIZE 0x800
-static void set_label(struct volume_id *id, char *buf, int count)
+static void set_label_raw(struct volume_id *id,
+ const __u8 *buf, unsigned int count)
{
- int i;
+ memcpy(id->label_raw, buf, count);
+ id->label_raw_len = count;
+}
- memcpy(id->label, buf, count);
+static void set_label_string(struct volume_id *id,
+ const __u8 *buf, unsigned int count)
+{
+ unsigned int i;
memcpy(id->label_string, buf, count);
/* remove trailing whitespace */
- i = strlen(id->label_string);
+ i = strnlen(id->label_string, count);
while (i--) {
if (! isspace(id->label_string[i]))
break;
id->label_string[i+1] = '\0';
}
-static void set_uuid(struct volume_id *id, unsigned char *buf, int count)
+#define LE 0
+#define BE 1
+static void set_label_unicode16(struct volume_id *id,
+ const __u8 *buf,
+ unsigned int endianess,
+ unsigned int count)
{
- int i;
+ unsigned int i, j;
+ __u16 c;
+
+ j = 0;
+ for (i = 0; i <= count-2; i += 2) {
+ if (endianess == LE)
+ c = (buf[i+1] << 8) | buf[i];
+ else
+ c = (buf[i] << 8) | buf[i+1];
+ if (c == 0) {
+ id->label_string[j] = '\0';
+ break;
+ } else if (c < 0x80) {
+ id->label_string[j++] = (__u8) c;
+ } else if (c < 0x800) {
+ id->label_string[j++] = (__u8) (0xc0 | (c >> 6));
+ id->label_string[j++] = (__u8) (0x80 | (c & 0x3f));
+ } else {
+ id->label_string[j++] = (__u8) (0xe0 | (c >> 12));
+ id->label_string[j++] = (__u8) (0x80 | ((c >> 6) & 0x3f));
+ id->label_string[j++] = (__u8) (0x80 | (c & 0x3f));
+ }
+ }
+}
+
+static void set_uuid(struct volume_id *id,
+ const __u8 *buf, unsigned int count)
+{
+ unsigned int i;
memcpy(id->uuid, buf, count);
break;
case 16:
sprintf(id->uuid_string,
- "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+ "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-"
+ "%02x%02x%02x%02x%02x%02x",
buf[0], buf[1], buf[2], buf[3],
buf[4], buf[5],
buf[6], buf[7],
}
}
-static int open_superblock(struct volume_id *id)
+static __u8 *get_buffer(struct volume_id *id,
+ unsigned long off, unsigned int len)
{
- /* get buffer to read the first block */
- if (id->buf == NULL) {
- id->buf = malloc(VOLUME_ID_BUFFER_SIZE);
- if (id->buf == NULL)
- return -1;
+ unsigned int buf_len;
+
+ /* check if requested area fits in superblock buffer */
+ if (off + len <= SB_BUFFER_SIZE) {
+ if (id->sbbuf == NULL) {
+ id->sbbuf = malloc(SB_BUFFER_SIZE);
+ if (id->sbbuf == NULL)
+ return NULL;
+ }
+
+ /* check if we need to read */
+ if ((off + len) > id->sbbuf_len) {
+ dbg("read sbbuf len:0x%lx", off + len);
+ lseek64(id->fd, 0, SEEK_SET);
+ buf_len = read(id->fd, id->sbbuf, off + len);
+ id->sbbuf_len = buf_len;
+ if (buf_len < off + len)
+ return NULL;
+ }
+
+ return &(id->sbbuf[off]);
+ } else {
+ if (len > SEEK_BUFFER_SIZE)
+ len = SEEK_BUFFER_SIZE;
+
+ /* get seek buffer */
+ if (id->seekbuf == NULL) {
+ id->seekbuf = malloc(SEEK_BUFFER_SIZE);
+ if (id->seekbuf == NULL)
+ return NULL;
+ }
+
+ /* check if we need to read */
+ if ((off < id->seekbuf_off) ||
+ ((off + len) > (id->seekbuf_off + id->seekbuf_len))) {
+ dbg("read seekbuf off:0x%lx len:0x%x", off, len);
+ lseek64(id->fd, off, SEEK_SET);
+ buf_len = read(id->fd, id->seekbuf, len);
+ dbg("got 0x%x (%i) bytes", buf_len, buf_len);
+ id->seekbuf_off = off;
+ id->seekbuf_len = buf_len;
+ if (buf_len < len)
+ return NULL;
+ }
+
+ return &(id->seekbuf[off - id->seekbuf_off]);
}
-
- /* try to read the first 64k, but at least the first block */
- memset(id->buf, 0x00, VOLUME_ID_BUFFER_SIZE);
- lseek(id->fd, 0, SEEK_SET);
- if (read(id->fd, id->buf, VOLUME_ID_BUFFER_SIZE) < 0x200)
- return -1;
-
- return 0;
}
-static void close_superblock(struct volume_id *id)
+static void free_buffer(struct volume_id *id)
{
- if (id->buf != NULL) {
- free(id->buf);
- id->buf = NULL;
+ if (id->sbbuf != NULL) {
+ free(id->sbbuf);
+ id->sbbuf = NULL;
+ id->sbbuf_len = 0;
+ }
+ if (id->seekbuf != NULL) {
+ free(id->seekbuf);
+ id->seekbuf = NULL;
+ id->seekbuf_len = 0;
}
}
static int probe_ext(struct volume_id *id)
{
struct ext2_super_block {
- __u32 s_inodes_count;
- __u32 s_blocks_count;
- __u32 s_r_blocks_count;
- __u32 s_free_blocks_count;
- __u32 s_free_inodes_count;
- __u32 s_first_data_block;
- __u32 s_log_block_size;
- __u32 s_dummy3[7];
- unsigned char s_magic[2];
- __u16 s_state;
- __u32 s_dummy5[8];
- __u32 s_feature_compat;
- __u32 s_feature_incompat;
- __u32 s_feature_ro_compat;
- unsigned char s_uuid[16];
- char s_volume_name[16];
- } *es;
-
- es = (struct ext2_super_block *) (id->buf + EXT_SUPERBLOCK_OFFSET);
-
- if (es->s_magic[0] != 0123 ||
- es->s_magic[1] != 0357)
+ __u32 inodes_count;
+ __u32 blocks_count;
+ __u32 r_blocks_count;
+ __u32 free_blocks_count;
+ __u32 free_inodes_count;
+ __u32 first_data_block;
+ __u32 log_block_size;
+ __u32 dummy3[7];
+ __u8 magic[2];
+ __u16 state;
+ __u32 dummy5[8];
+ __u32 feature_compat;
+ __u32 feature_incompat;
+ __u32 feature_ro_compat;
+ __u8 uuid[16];
+ __u8 volume_name[16];
+ } __attribute__((__packed__)) *es;
+
+ es = (struct ext2_super_block *)
+ get_buffer(id, EXT_SUPERBLOCK_OFFSET, 0x200);
+ if (es == NULL)
+ return -1;
+
+ if (es->magic[0] != 0123 ||
+ es->magic[1] != 0357)
return -1;
- set_label(id, es->s_volume_name, 16);
- set_uuid(id, es->s_uuid, 16);
+ set_label_raw(id, es->volume_name, 16);
+ set_label_string(id, es->volume_name, 16);
+ set_uuid(id, es->uuid, 16);
- if ((cpu_to_le32(es->s_feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0) {
+ if ((le32_to_cpu(es->feature_compat) &
+ EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0) {
id->fs_type = EXT3;
id->fs_name = "ext3";
} else {
static int probe_reiser(struct volume_id *id)
{
struct reiser_super_block {
- __u32 rs_blocks_count;
- __u32 rs_free_blocks;
- __u32 rs_root_block;
- __u32 rs_journal_block;
- __u32 rs_journal_dev;
- __u32 rs_orig_journal_size;
- __u32 rs_dummy2[5];
- __u16 rs_blocksize;
- __u16 rs_dummy3[3];
- unsigned char rs_magic[12];
- __u32 rs_dummy4[5];
- unsigned char rs_uuid[16];
- char rs_label[16];
- } *rs;
-
- rs = (struct reiser_super_block *) &(id->buf[REISER1_SUPERBLOCK_OFFSET]);
-
- if (strncmp(rs->rs_magic, "ReIsErFs", 8) == 0)
+ __u32 blocks_count;
+ __u32 free_blocks;
+ __u32 root_block;
+ __u32 journal_block;
+ __u32 journal_dev;
+ __u32 orig_journal_size;
+ __u32 dummy2[5];
+ __u16 blocksize;
+ __u16 dummy3[3];
+ __u8 magic[12];
+ __u32 dummy4[5];
+ __u8 uuid[16];
+ __u8 label[16];
+ } __attribute__((__packed__)) *rs;
+
+ rs = (struct reiser_super_block *)
+ get_buffer(id, REISER_SUPERBLOCK_OFFSET, 0x200);
+ if (rs == NULL)
+ return -1;
+
+ if (strncmp(rs->magic, "ReIsEr2Fs", 9) == 0)
+ goto found;
+ if (strncmp(rs->magic, "ReIsEr3Fs", 9) == 0)
goto found;
- rs = (struct reiser_super_block *) &(id->buf[REISER_SUPERBLOCK_OFFSET]);
+ rs = (struct reiser_super_block *)
+ get_buffer(id, REISER1_SUPERBLOCK_OFFSET, 0x200);
+ if (rs == NULL)
+ return -1;
- if (strncmp(rs->rs_magic, "ReIsEr2Fs", 9) == 0)
- goto found;
- if (strncmp(rs->rs_magic, "ReIsEr3Fs", 9) == 0)
+ if (strncmp(rs->magic, "ReIsErFs", 8) == 0)
goto found;
return -1;
found:
- set_label(id, rs->rs_label, 16);
- set_uuid(id, rs->rs_uuid, 16);
+ set_label_raw(id, rs->label, 16);
+ set_label_string(id, rs->label, 16);
+ set_uuid(id, rs->uuid, 16);
id->fs_type = REISER;
id->fs_name = "reiser";
static int probe_xfs(struct volume_id *id)
{
struct xfs_super_block {
- unsigned char xs_magic[4];
- __u32 xs_blocksize;
- __u64 xs_dblocks;
- __u64 xs_rblocks;
- __u32 xs_dummy1[2];
- unsigned char xs_uuid[16];
- __u32 xs_dummy2[15];
- char xs_fname[12];
- __u32 xs_dummy3[2];
- __u64 xs_icount;
- __u64 xs_ifree;
- __u64 xs_fdblocks;
- } *xs;
-
- xs = (struct xfs_super_block *) id->buf;
-
- if (strncmp(xs->xs_magic, "XFSB", 4) != 0)
+ __u8 magic[4];
+ __u32 blocksize;
+ __u64 dblocks;
+ __u64 rblocks;
+ __u32 dummy1[2];
+ __u8 uuid[16];
+ __u32 dummy2[15];
+ __u8 fname[12];
+ __u32 dummy3[2];
+ __u64 icount;
+ __u64 ifree;
+ __u64 fdblocks;
+ } __attribute__((__packed__)) *xs;
+
+ xs = (struct xfs_super_block *) get_buffer(id, 0, 0x200);
+ if (xs == NULL)
+ return -1;
+
+ if (strncmp(xs->magic, "XFSB", 4) != 0)
return -1;
- set_label(id, xs->xs_fname, 12);
- set_uuid(id, xs->xs_uuid, 16);
+ set_label_raw(id, xs->fname, 12);
+ set_label_string(id, xs->fname, 12);
+ set_uuid(id, xs->uuid, 16);
id->fs_type = XFS;
id->fs_name = "xfs";
static int probe_jfs(struct volume_id *id)
{
struct jfs_super_block {
- unsigned char js_magic[4];
- __u32 js_version;
- __u64 js_size;
- __u32 js_bsize;
- __u32 js_dummy1;
- __u32 js_pbsize;
- __u32 js_dummy2[27];
- unsigned char js_uuid[16];
- unsigned char js_label[16];
- unsigned char js_loguuid[16];
- } *js;
-
- js = (struct jfs_super_block *) &(id->buf[JFS_SUPERBLOCK_OFFSET]);
-
- if (strncmp(js->js_magic, "JFS1", 4) != 0)
+ __u8 magic[4];
+ __u32 version;
+ __u64 size;
+ __u32 bsize;
+ __u32 dummy1;
+ __u32 pbsize;
+ __u32 dummy2[27];
+ __u8 uuid[16];
+ __u8 label[16];
+ __u8 loguuid[16];
+ } __attribute__((__packed__)) *js;
+
+ js = (struct jfs_super_block *)
+ get_buffer(id, JFS_SUPERBLOCK_OFFSET, 0x200);
+ if (js == NULL)
+ return -1;
+
+ if (strncmp(js->magic, "JFS1", 4) != 0)
return -1;
- set_label(id, js->js_label, 16);
- set_uuid(id, js->js_uuid, 16);
+ set_label_raw(id, js->label, 16);
+ set_label_string(id, js->label, 16);
+ set_uuid(id, js->uuid, 16);
id->fs_type = JFS;
id->fs_name = "jfs";
static int probe_vfat(struct volume_id *id)
{
struct vfat_super_block {
- unsigned char vs_ignored[3];
- unsigned char vs_sysid[8];
- unsigned char vs_sector_size[2];
- __u8 vs_cluster_size;
- __u16 vs_reserved;
- __u8 vs_fats;
- unsigned char vs_dir_entries[2];
- unsigned char vs_sectors[2];
- unsigned char vs_media;
- __u16 vs_fat_length;
- __u16 vs_secs_track;
- __u16 vs_heads;
- __u32 vs_hidden;
- __u32 vs_total_sect;
- __u32 vs_fat32_length;
- __u16 vs_flags;
- __u8 vs_version[2];
- __u32 vs_root_cluster;
- __u16 vs_insfo_sector;
- __u16 vs_backup_boot;
- __u16 vs_reserved2[6];
- unsigned char vs_unknown[3];
- unsigned char vs_serno[4];
- char vs_label[11];
- unsigned char vs_magic[8];
- unsigned char vs_dummy2[164];
- unsigned char vs_pmagic[2];
- } *vs;
-
- vs = (struct vfat_super_block *) id->buf;
-
- if (strncmp(vs->vs_magic, "MSWIN", 5) == 0)
+ __u8 ignored[3];
+ __u8 sysid[8];
+ __u8 sector_size[2];
+ __u8 cluster_size;
+ __u16 reserved;
+ __u8 fats;
+ __u8 dir_entries[2];
+ __u8 sectors[2];
+ __u8 media;
+ __u16 fat_length;
+ __u16 secs_track;
+ __u16 heads;
+ __u32 hidden;
+ __u32 total_sect;
+ __u32 fat32_length;
+ __u16 flags;
+ __u8 version[2];
+ __u32 root_cluster;
+ __u16 insfo_sector;
+ __u16 backup_boot;
+ __u16 reserved2[6];
+ __u8 unknown[3];
+ __u8 serno[4];
+ __u8 label[11];
+ __u8 magic[8];
+ __u8 dummy2[164];
+ __u8 pmagic[2];
+ } __attribute__((__packed__)) *vs;
+
+ vs = (struct vfat_super_block *) get_buffer(id, 0, 0x200);
+ if (vs == NULL)
+ return -1;
+
+ if (strncmp(vs->magic, "MSWIN", 5) == 0)
goto found;
- if (strncmp(vs->vs_magic, "FAT32 ", 8) == 0)
+ if (strncmp(vs->magic, "FAT32 ", 8) == 0)
goto found;
return -1;
found:
- memcpy(id->label, vs->vs_label, 11);
- memcpy(id->uuid, vs->vs_serno, 4);
+ set_label_raw(id, vs->label, 11);
+ set_label_string(id, vs->label, 11);
+ set_uuid(id, vs->serno, 4);
id->fs_type = VFAT;
id->fs_name = "vfat";
static int probe_msdos(struct volume_id *id)
{
struct msdos_super_block {
- unsigned char ms_ignored[3];
- unsigned char ms_sysid[8];
- unsigned char ms_sector_size[2];
- __u8 ms_cluster_size;
- __u16 ms_reserved;
- __u8 ms_fats;
- unsigned char ms_dir_entries[2];
- unsigned char ms_sectors[2];
- unsigned char ms_media;
- __u16 ms_fat_length;
- __u16 ms_secs_track;
- __u16 ms_heads;
- __u32 ms_hidden;
- __u32 ms_total_sect;
- unsigned char ms_unknown[3];
- unsigned char ms_serno[4];
- char ms_label[11];
- unsigned char ms_magic[8];
- unsigned char ms_dummy2[192];
- unsigned char ms_pmagic[2];
- } *ms;
-
- ms = (struct msdos_super_block *) id->buf;
-
- if (strncmp(ms->ms_magic, "MSDOS", 5) == 0)
+ __u8 ignored[3];
+ __u8 sysid[8];
+ __u8 sector_size[2];
+ __u8 cluster_size;
+ __u16 reserved;
+ __u8 fats;
+ __u8 dir_entries[2];
+ __u8 sectors[2];
+ __u8 media;
+ __u16 fat_length;
+ __u16 secs_track;
+ __u16 heads;
+ __u32 hidden;
+ __u32 total_sect;
+ __u8 unknown[3];
+ __u8 serno[4];
+ __u8 label[11];
+ __u8 magic[8];
+ __u8 dummy2[192];
+ __u8 pmagic[2];
+ } __attribute__((__packed__)) *ms;
+
+ ms = (struct msdos_super_block *) get_buffer(id, 0, 0x200);
+ if (ms == NULL)
+ return -1;
+
+ if (strncmp(ms->magic, "MSDOS", 5) == 0)
goto found;
- if (strncmp(ms->ms_magic, "FAT16 ", 8) == 0)
+ if (strncmp(ms->magic, "FAT16 ", 8) == 0)
goto found;
- if (strncmp(ms->ms_magic, "FAT12 ", 8) == 0)
+ if (strncmp(ms->magic, "FAT12 ", 8) == 0)
goto found;
return -1;
found:
- set_label(id, ms->ms_label, 11);
- set_uuid(id, ms->ms_serno, 4);
+ set_label_raw(id, ms->label, 11);
+ set_label_string(id, ms->label, 11);
+ set_uuid(id, ms->serno, 4);
id->fs_type = MSDOS;
id->fs_name = "msdos";
return 0;
}
+#define UDF_VSD_OFFSET 0x8000
+static int probe_udf(struct volume_id *id)
+{
+ struct volume_descriptor {
+ struct descriptor_tag {
+ __u16 id;
+ __u16 version;
+ __u8 checksum;
+ __u8 reserved;
+ __u16 serial;
+ __u16 crc;
+ __u16 crc_len;
+ __u32 location;
+ } __attribute__((__packed__)) tag;
+ union {
+ struct anchor_descriptor {
+ __u32 length;
+ __u32 location;
+ } __attribute__((__packed__)) anchor;
+ struct primary_descriptor {
+ __u32 seq_num;
+ __u32 desc_num;
+ struct dstring {
+ __u8 clen;
+ __u8 c[31];
+ } __attribute__((__packed__)) ident;
+ } __attribute__((__packed__)) primary;
+ } __attribute__((__packed__)) type;
+ } __attribute__((__packed__)) *vd;
+
+ struct volume_structure_descriptor {
+ __u8 type;
+ __u8 id[5];
+ __u8 version;
+ } *vsd;
+
+ unsigned int bs;
+ unsigned int b;
+ unsigned int type;
+ unsigned int count;
+ unsigned int loc;
+ unsigned int clen;
+
+ vsd = (struct volume_structure_descriptor *)
+ get_buffer(id, UDF_VSD_OFFSET, 0x200);
+ if (vsd == NULL)
+ return -1;
+
+ if (strncmp(vsd->id, "NSR02", 5) == 0)
+ goto blocksize;
+ if (strncmp(vsd->id, "NSR03", 5) == 0)
+ goto blocksize;
+ if (strncmp(vsd->id, "BEA01", 5) == 0)
+ goto blocksize;
+ if (strncmp(vsd->id, "BOOT2", 5) == 0)
+ goto blocksize;
+ if (strncmp(vsd->id, "CD001", 5) == 0)
+ goto blocksize;
+ if (strncmp(vsd->id, "CDW02", 5) == 0)
+ goto blocksize;
+ if (strncmp(vsd->id, "TEA03", 5) == 0)
+ goto blocksize;
+ return -1;
+
+blocksize:
+ /* search the next VSD to get the logical block size of the volume */
+ for (bs = 0x800; bs < 0x8000; bs += 0x800) {
+ vsd = (struct volume_structure_descriptor *)
+ get_buffer(id, UDF_VSD_OFFSET + bs, 0x800);
+ if (vsd == NULL)
+ return -1;
+ dbg("test for blocksize: 0x%x", bs);
+ if (vsd->id[0] != '\0')
+ goto nsr;
+ }
+ return -1;
+
+nsr:
+ /* search the list of VSDs for a NSR descriptor */
+ for (b = 0; b < 64; b++) {
+ vsd = (struct volume_structure_descriptor *)
+ get_buffer(id, UDF_VSD_OFFSET + (b * bs), 0x800);
+ if (vsd == NULL)
+ return -1;
+
+ dbg("vsd: %c%c%c%c%c",
+ vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]);
+
+ if (vsd->id[0] == '\0')
+ return -1;
+ if (strncmp(vsd->id, "NSR02", 5) == 0)
+ goto anchor;
+ if (strncmp(vsd->id, "NSR03", 5) == 0)
+ goto anchor;
+ }
+ return -1;
+
+anchor:
+ /* read anchor volume descriptor */
+ vd = (struct volume_descriptor *) get_buffer(id, 256 * bs, 0x200);
+ if (vd == NULL)
+ return -1;
+
+ type = le16_to_cpu(vd->tag.id);
+ if (type != 2) /* TAG_ID_AVDP */
+ goto found;
+
+ /* get desriptor list address and block count */
+ count = le32_to_cpu(vd->type.anchor.length) / bs;
+ loc = le32_to_cpu(vd->type.anchor.location);
+ dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);
+
+ /* pick the primary descriptor from the list */
+ for (b = 0; b < count; b++) {
+ vd = (struct volume_descriptor *)
+ get_buffer(id, (loc + b) * bs, 0x200);
+ if (vd == NULL)
+ return -1;
+
+ type = le16_to_cpu(vd->tag.id);
+ dbg("descriptor type %i", type);
+
+ /* check validity */
+ if (type == 0)
+ goto found;
+ if (le32_to_cpu(vd->tag.location) != loc + b)
+ goto found;
+
+ if (type == 1) /* TAG_ID_PVD */
+ goto pvd;
+ }
+ goto found;
+
+pvd:
+ set_label_raw(id, &(vd->type.primary.ident.clen), 32);
+
+ clen = vd->type.primary.ident.clen;
+ dbg("label string charsize=%i bit", clen);
+ if (clen == 8)
+ set_label_string(id, vd->type.primary.ident.c, 31);
+ else if (clen == 16)
+ set_label_unicode16(id, vd->type.primary.ident.c, BE,31);
+
+found:
+ id->fs_type = UDF;
+ id->fs_name = "udf";
+
+ return 0;
+}
+
+#define ISO_SUPERBLOCK_OFFSET 0x8000
+static int probe_iso9660(struct volume_id *id)
+{
+ union iso_super_block {
+ struct iso_header {
+ __u8 type;
+ __u8 id[5];
+ __u8 version;
+ __u8 unused1;
+ __u8 system_id[32];
+ __u8 volume_id[32];
+ } __attribute__((__packed__)) iso;
+ struct hs_header {
+ __u8 foo[8];
+ __u8 type;
+ __u8 id[4];
+ __u8 version;
+ } __attribute__((__packed__)) hs;
+ } __attribute__((__packed__)) *is;
+
+ is = (union iso_super_block *)
+ get_buffer(id, ISO_SUPERBLOCK_OFFSET, 0x200);
+ if (is == NULL)
+ return -1;
+
+ if (strncmp(is->iso.id, "CD001", 5) == 0) {
+ set_label_raw(id, is->iso.volume_id, 32);
+ set_label_string(id, is->iso.volume_id, 32);
+ goto found;
+ }
+ if (strncmp(is->hs.id, "CDROM", 5) == 0)
+ goto found;
+ return -1;
+
+found:
+ id->fs_type = ISO9660;
+ id->fs_name = "iso9660";
+
+ return 0;
+}
+
+#define MFT_RECORD_VOLUME 3
+#define MFT_RECORD_ATTR_VOLUME_NAME 0x60u
+#define MFT_RECORD_ATTR_OBJECT_ID 0x40u
+#define MFT_RECORD_ATTR_END 0xffffffffu
static int probe_ntfs(struct volume_id *id)
{
struct ntfs_super_block {
- char jump[3];
- char oem_id[4];
- } *ns;
-
- ns = (struct ntfs_super_block *) id->buf;
+ __u8 jump[3];
+ __u8 oem_id[8];
+ struct bios_param_block {
+ __u16 bytes_per_sector;
+ __u8 sectors_per_cluster;
+ __u16 reserved_sectors;
+ __u8 fats;
+ __u16 root_entries;
+ __u16 sectors;
+ __u8 media_type; /* 0xf8 = hard disk */
+ __u16 sectors_per_fat;
+ __u16 sectors_per_track;
+ __u16 heads;
+ __u32 hidden_sectors;
+ __u32 large_sectors;
+ } __attribute__((__packed__)) bpb;
+ __u8 unused[4];
+ __u64 number_of_sectors;
+ __u64 mft_cluster_location;
+ __u64 mft_mirror_cluster_location;
+ __s8 cluster_per_mft_record;
+ } __attribute__((__packed__)) *ns;
+
+ struct master_file_table_record {
+ __u8 magic[4];
+ __u16 usa_ofs;
+ __u16 usa_count;
+ __u64 lsn;
+ __u16 sequence_number;
+ __u16 link_count;
+ __u16 attrs_offset;
+ __u16 flags;
+ __u32 bytes_in_use;
+ __u32 bytes_allocated;
+ } __attribute__((__packed__)) *mftr;
+
+ struct file_attribute {
+ __u32 type;
+ __u32 len;
+ __u8 non_resident;
+ __u8 name_len;
+ __u16 name_offset;
+ __u16 flags;
+ __u16 instance;
+ __u32 value_len;
+ __u16 value_offset;
+ } __attribute__((__packed__)) *attr;
+
+ unsigned int sector_size;
+ unsigned int cluster_size;
+ unsigned long mft_cluster;
+ unsigned long mft_off;
+ unsigned int mft_record_size;
+ unsigned int attr_type;
+ unsigned int attr_off;
+ unsigned int attr_len;
+ unsigned int val_off;
+ unsigned int val_len;
+ const __u8 *buf;
+ const __u8 *val;
+
+ ns = (struct ntfs_super_block *) get_buffer(id, 0, 0x200);
+ if (ns == NULL)
+ return -1;
if (strncmp(ns->oem_id, "NTFS", 4) != 0)
return -1;
+ sector_size = le16_to_cpu(ns->bpb.bytes_per_sector);
+ cluster_size = ns->bpb.sectors_per_cluster * sector_size;
+ mft_cluster = le64_to_cpu(ns->mft_cluster_location);
+ mft_off = mft_cluster * cluster_size;
+
+ if (ns->cluster_per_mft_record < 0)
+ /* size = -log2(mft_record_size); normally 1024 Bytes */
+ mft_record_size = 1 << -ns->cluster_per_mft_record;
+ else
+ mft_record_size = ns->cluster_per_mft_record * cluster_size;
+
+ dbg("sectorsize 0x%x", sector_size);
+ dbg("clustersize 0x%x", cluster_size);
+ dbg("mftcluster %li", mft_cluster);
+ dbg("mftoffset 0x%lx", mft_off);
+ dbg("cluster per mft_record %i", ns->cluster_per_mft_record);
+ dbg("mft record size %i", mft_record_size);
+
+ buf = get_buffer(id, mft_off + (MFT_RECORD_VOLUME * mft_record_size),
+ mft_record_size);
+ if (buf == NULL)
+ goto found;
+
+ mftr = (struct master_file_table_record*) buf;
+
+ dbg("mftr->magic[0] = '%c' %03d, 0x%02x", mftr->magic[0], mftr->magic[0], mftr->magic[0]);
+ dbg("mftr->magic[1] = '%c' %03d, 0x%02x", mftr->magic[1], mftr->magic[1], mftr->magic[1]);
+ dbg("mftr->magic[2] = '%c' %03d, 0x%02x", mftr->magic[2], mftr->magic[2], mftr->magic[2]);
+ dbg("mftr->magic[3] = '%c' %03d, 0x%02x", mftr->magic[3], mftr->magic[3], mftr->magic[3]);
+ if (strncmp(mftr->magic, "FILE", 4) != 0)
+ goto found;
+
+ attr_off = le16_to_cpu(mftr->attrs_offset);
+ dbg("file $Volume's attributes are at offset %i", attr_off);
+
+ while (1) {
+ attr = (struct file_attribute*) &buf[attr_off];
+ attr_type = le32_to_cpu(attr->type);
+ attr_len = le16_to_cpu(attr->len);
+ val_off = le16_to_cpu(attr->value_offset);
+ val_len = le32_to_cpu(attr->value_len);
+
+ if (attr_type == MFT_RECORD_ATTR_END)
+ break;
+
+ dbg("found attribute type 0x%x, len %i, at offset %i",
+ attr_type, attr_len, attr_off);
+
+ if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
+ dbg("found label, len %i", val_len);
+ if (val_len > VOLUME_ID_LABEL_SIZE)
+ val_len = VOLUME_ID_LABEL_SIZE;
+
+ val = &((__u8 *) attr)[val_off];
+ set_label_raw(id, val, val_len);
+ set_label_unicode16(id, val, LE, val_len);
+ }
+
+ if (attr_type == MFT_RECORD_ATTR_OBJECT_ID) {
+ dbg("found uuid");
+ val = &((__u8 *) attr)[val_off];
+ set_uuid(id, val, 16);
+ }
+
+ if (attr_len == 0)
+ break;
+ attr_off += attr_len;
+ if (attr_off >= mft_record_size)
+ break;
+ }
+
+found:
id->fs_type = NTFS;
id->fs_name = "ntfs";
return 0;
}
+#define LARGEST_PAGESIZE 0x4000
static int probe_swap(struct volume_id *id)
{
- int magic;
+ const __u8 *sig;
+ unsigned int page;
/* huhh, the swap signature is on the end of the PAGE_SIZE */
- for (magic = 0x1000; magic <= 0x4000; magic <<= 1) {
- if (strncmp(&(id->buf[magic -10]), "SWAP-SPACE", 10) == 0)
+ for (page = 0x1000; page <= LARGEST_PAGESIZE; page <<= 1) {
+ sig = get_buffer(id, page-10, 10);
+ if (sig == NULL)
+ return -1;
+
+ if (strncmp(sig, "SWAP-SPACE", 10) == 0)
goto found;
- if (strncmp(&(id->buf[magic -10]), "SWAPSPACE2", 10) == 0)
+ if (strncmp(sig, "SWAPSPACE2", 10) == 0)
goto found;
}
return -1;
if (id == NULL)
return -EINVAL;
- if (open_superblock(id) != 0)
- return -EACCES;
-
switch (fs_type) {
case EXT3:
case EXT2:
case VFAT:
rc = probe_vfat(id);
break;
+ case UDF:
+ rc = probe_udf(id);
+ break;
+ case ISO9660:
+ rc = probe_iso9660(id);
+ break;
case NTFS:
rc = probe_ntfs(id);
break;
case SWAP:
rc = probe_swap(id);
break;
+ case ALL:
default:
+ /* fill buffer with maximum */
+ get_buffer(id, 0, SB_BUFFER_SIZE);
rc = probe_ext(id);
if (rc == 0)
break;
if (rc == 0)
break;
rc = probe_vfat(id);
+ if (rc == 0)
+ break;
+ rc = probe_udf(id);
+ if (rc == 0)
+ break;
+ rc = probe_iso9660(id);
if (rc == 0)
break;
rc = probe_ntfs(id);
rc = -1;
}
+ /* If the filestystem in recognized, we free the allocated buffers,
+ otherwise they will stay in place for the possible next probe call */
if (rc == 0)
- close_superblock(id);
+ free_buffer(id);
return rc;
}
struct volume_id *volume_id_open_dev_t(dev_t devt)
{
struct volume_id *id;
- char tmp_node[VOLUME_ID_PATH_MAX];
+ __u8 tmp_node[VOLUME_ID_PATH_MAX];
snprintf(tmp_node, VOLUME_ID_PATH_MAX,
- "/tmp/volume-%u-%u", major(devt), minor(devt));
+ "/tmp/volume-%u-%u-%u", getpid(), major(devt), minor(devt));
tmp_node[VOLUME_ID_PATH_MAX] = '\0';
/* create tempory node to open the block device */
+ unlink(tmp_node);
if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
return NULL;
if (id->fd_close != 0)
close(id->fd);
- close_superblock(id);
+ free_buffer(id);
free(id);
}
~ianmdlvl / elogind.git / blobdiff