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authorkay.sievers@vrfy.org <kay.sievers@vrfy.org>2004-04-30 23:26:33 -0700
committerGreg KH <gregkh@suse.de>2005-04-26 21:35:17 -0700
commit3611d5820c0fc0863d15c04884b05c9e04492f45 (patch)
tree594698488dc499c4ba88afa07087d7c03efa93de /extras
parente13fa59953d64e478025fd1200bb5fd0baf671b2 (diff)
[PATCH] udev callout for reading filesystem labels
here is a small udev toy, which enables udev to name partitions by its filesystem label or uuid's. The following udev rule: KERNEL="sd*", PROGRAM="/sbin/udev_volume_id -M%M -m%m -u", SYMLINK="%c" creates a symlink with the uuid read from the filesystem. If no label or uuid is found the program exits with nonzero and the rule will fail. ext2, ext3, reiserfs, xfs, jfs, vfat, msdos volume labels are supported, ntfs and swap partitions can be recognized. It's possible to compile with klibc and the static binary takes 13kb.
Diffstat (limited to 'extras')
-rw-r--r--extras/volume_id/Makefile50
-rw-r--r--extras/volume_id/udev_volume_id.c120
-rw-r--r--extras/volume_id/volume_id.c550
-rw-r--r--extras/volume_id/volume_id.h72
4 files changed, 792 insertions, 0 deletions
diff --git a/extras/volume_id/Makefile b/extras/volume_id/Makefile
new file mode 100644
index 0000000000..6a3d2866c4
--- /dev/null
+++ b/extras/volume_id/Makefile
@@ -0,0 +1,50 @@
+# Makefile for udev_volume_id
+#
+# Copyright (C) 2004 Kay Sievers <kay@vrfy.org>
+#
+# 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.
+#
+
+PROG = udev_volume_id
+
+all: $(PROG)
+
+prefix =
+exec_prefix = ${prefix}
+etcdir = ${prefix}/etc
+sbindir = ${exec_prefix}/sbin
+usrbindir = ${exec_prefix}/usr/bin
+usrsbindir = ${exec_prefix}/usr/sbin
+mandir = ${prefix}/usr/share/man
+devddir = ${etcdir}/dev.d/default
+configdir = ${etcdir}/udev/
+initdir = ${etcdir}/init.d/
+srcdir = .
+
+INSTALL = /usr/bin/install -c
+INSTALL_PROGRAM = ${INSTALL}
+INSTALL_DATA = ${INSTALL} -m 644
+INSTALL_SCRIPT = ${INSTALL_PROGRAM}
+
+override CFLAGS+=-Wall -fno-builtin
+OBJS = volume_id.o udev_volume_id.o
+HEADERS = volume_id.h
+
+$(OBJS): $(HEADERS)
+
+$(PROG): $(OBJS) $(HEADERS)
+ $(LD) $(LDFLAGS) -o $(PROG) $(CRT0) $(OBJS) $(LIB_OBJS) $(ARCH_LIB_OBJS)
+
+clean:
+ rm -f $(PROG) $(OBJS)
+
+spotless: clean
+
+install: all
+ $(INSTALL_PROGRAM) $(PROG) $(DESTDIR)$(usrsbindir)/$(PROG)
+
+uninstall:
+ - rm $(DESTDIR)$(usrsbindir)/$(PROG)
+
diff --git a/extras/volume_id/udev_volume_id.c b/extras/volume_id/udev_volume_id.c
new file mode 100644
index 0000000000..88779ccd36
--- /dev/null
+++ b/extras/volume_id/udev_volume_id.c
@@ -0,0 +1,120 @@
+/*
+ * udev_volume_id - udev callout to read filesystem label and uuid
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * sample udev rule for creation of a symlink with the filsystem uuid:
+ * KERNEL="sd*", PROGRAM="/sbin/udev_volume_id -M%M -m%m -u", SYMLINK="%c"
+ *
+ * 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 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.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "volume_id.h"
+
+int main(int argc, char *argv[])
+{
+ struct volume_id *vid;
+ const char help[] = "usage: udev_volume_id -m<minor> -M<major> [-t|-l|-u]\n";
+ int major = -1;
+ int minor = -1;
+ char *tail;
+ static const char short_options[] = "M:m:htlu";
+ int option;
+ char print = '\0';
+ int rc;
+
+
+ while (1) {
+ option = getopt(argc, argv, short_options);
+ if (option == -1)
+ break;
+
+ switch (option) {
+ case 'M':
+ major = (int) strtoul(optarg, &tail, 10);
+ if (tail[0] != '\0') {
+ printf("invalid major\n");
+ exit(1);
+ }
+ break;
+ case 'm':
+ minor = (int) strtoul(optarg, &tail, 10);
+ if (tail[0] != '\0') {
+ printf("invalid minor\n");
+ exit(1);
+ }
+ break;
+ case 't':
+ print = 't';
+ break;
+ case 'l':
+ print = 'l';
+ break;
+ case 'u':
+ print = 'u';
+ break;
+ case 'h':
+ case '?':
+ default:
+ printf(help);
+ exit(1);
+ }
+ }
+
+ if (major == -1 || minor == -1) {
+ printf(help);
+ exit(1);
+ }
+
+ vid = volume_id_open_dev_t(makedev(major, minor));
+ if (vid == NULL) {
+ printf("error open volume\n");
+ exit(1);
+ }
+
+ rc = volume_id_probe(vid, ALL);
+ if (rc != 0) {
+ printf("error probing volume\n");
+ exit(1);
+ }
+
+ switch (print) {
+ case 't':
+ printf("%s\n", vid->fs_name);
+ break;
+ case 'l':
+ if (vid->label_string[0] == '\0')
+ exit(2);
+ printf("%s\n", vid->label_string);
+ break;
+ case 'u':
+ if (vid->uuid_string[0] == '\0')
+ exit(2);
+ printf("%s\n", vid->uuid_string);
+ break;
+ default:
+ printf("T:%s\n", vid->fs_name);
+ printf("L:%s\n", vid->label_string);
+ printf("U:%s\n", vid->uuid_string);
+ }
+
+ volume_id_close(vid);
+
+ exit(0);
+}
diff --git a/extras/volume_id/volume_id.c b/extras/volume_id/volume_id.c
new file mode 100644
index 0000000000..cc5475fc8d
--- /dev/null
+++ b/extras/volume_id/volume_id.c
@@ -0,0 +1,550 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * The superblock structs are taken from the libblkid living inside
+ * 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
+ * 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 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.
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <asm/types.h>
+
+#include "volume_id.h"
+
+
+#define bswap32(x) (__u32)((((__u32)(x) & 0xff000000u) >> 24) | \
+ (((__u32)(x) & 0x00ff0000u) >> 8) | \
+ (((__u32)(x) & 0x0000ff00u) << 8) | \
+ (((__u32)(x) & 0x000000ffu) << 24))
+
+#if (__BYTE_ORDER == __LITTLE_ENDIAN)
+#define cpu_to_le32(x) (x)
+#elif (__BYTE_ORDER == __BIG_ENDIAN)
+#define cpu_to_le32(x) bswap32(x)
+#endif
+
+#define VOLUME_ID_BUFFER_SIZE 0x11000 /* reiser offset is 64k */
+
+
+static void set_label(struct volume_id *id, char *buf, int count)
+{
+ int i;
+
+ memcpy(id->label, buf, count);
+
+ memcpy(id->label_string, buf, count);
+
+ /* remove trailing whitespace */
+ i = strlen(id->label_string);
+ 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)
+{
+ int i;
+
+ memcpy(id->uuid, buf, count);
+
+ /* create string if uuid is set */
+ for (i = 0; i < count; i++)
+ if (buf[i] != 0)
+ goto set;
+ return;
+
+set:
+ switch(count) {
+ case 4:
+ sprintf(id->uuid_string, "%02X%02X-%02X%02X",
+ buf[3], buf[2], buf[1], buf[0]);
+ break;
+ case 16:
+ sprintf(id->uuid_string,
+ "%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],
+ buf[8], buf[9],
+ buf[10], buf[11], buf[12], buf[13], buf[14],buf[15]);
+ break;
+ }
+}
+
+static int open_superblock(struct volume_id *id)
+{
+ /* get buffer to read the first block */
+ if (id->buf == NULL) {
+ id->buf = malloc(VOLUME_ID_BUFFER_SIZE);
+ if (id->buf == NULL)
+ return -1;
+ }
+
+ /* 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)
+{
+ if (id->buf != NULL) {
+ free(id->buf);
+ id->buf = NULL;
+ }
+}
+
+#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x00000004
+#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x00000008
+#define EXT_SUPERBLOCK_OFFSET 0x400
+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)
+ return -1;
+
+ set_label(id, es->s_volume_name, 16);
+ set_uuid(id, es->s_uuid, 16);
+
+ if ((cpu_to_le32(es->s_feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0) {
+ id->fs_type = EXT3;
+ id->fs_name = "ext3";
+ } else {
+ id->fs_type = EXT2;
+ id->fs_name = "ext2";
+ }
+
+ return 0;
+}
+
+#define REISER1_SUPERBLOCK_OFFSET 0x2000
+#define REISER_SUPERBLOCK_OFFSET 0x10000
+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)
+ goto found;
+
+ rs = (struct reiser_super_block *) &(id->buf[REISER_SUPERBLOCK_OFFSET]);
+
+ if (strncmp(rs->rs_magic, "ReIsEr2Fs", 9) == 0)
+ goto found;
+ if (strncmp(rs->rs_magic, "ReIsEr3Fs", 9) == 0)
+ goto found;
+
+ return -1;
+
+found:
+ set_label(id, rs->rs_label, 16);
+ set_uuid(id, rs->rs_uuid, 16);
+
+ id->fs_type = REISER;
+ id->fs_name = "reiser";
+
+ return 0;
+}
+
+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)
+ return -1;
+
+ set_label(id, xs->xs_fname, 12);
+ set_uuid(id, xs->xs_uuid, 16);
+
+ id->fs_type = XFS;
+ id->fs_name = "xfs";
+
+ return 0;
+}
+
+#define JFS_SUPERBLOCK_OFFSET 0x8000
+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)
+ return -1;
+
+ set_label(id, js->js_label, 16);
+ set_uuid(id, js->js_uuid, 16);
+
+ id->fs_type = JFS;
+ id->fs_name = "jfs";
+
+ return 0;
+}
+
+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)
+ goto found;
+ if (strncmp(vs->vs_magic, "FAT32 ", 8) == 0)
+ goto found;
+ return -1;
+
+found:
+ memcpy(id->label, vs->vs_label, 11);
+ memcpy(id->uuid, vs->vs_serno, 4);
+
+ id->fs_type = VFAT;
+ id->fs_name = "vfat";
+
+ return 0;
+}
+
+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)
+ goto found;
+ if (strncmp(ms->ms_magic, "FAT16 ", 8) == 0)
+ goto found;
+ if (strncmp(ms->ms_magic, "FAT12 ", 8) == 0)
+ goto found;
+ return -1;
+
+found:
+ set_label(id, ms->ms_label, 11);
+ set_uuid(id, ms->ms_serno, 4);
+
+ id->fs_type = MSDOS;
+ id->fs_name = "msdos";
+
+ return 0;
+}
+
+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;
+
+ if (strncmp(ns->oem_id, "NTFS", 4) != 0)
+ return -1;
+
+ id->fs_type = NTFS;
+ id->fs_name = "ntfs";
+
+ return 0;
+}
+
+static int probe_swap(struct volume_id *id)
+{
+ int magic;
+
+ /* 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)
+ goto found;
+ if (strncmp(&(id->buf[magic -10]), "SWAPSPACE2", 10) == 0)
+ goto found;
+ }
+ return -1;
+
+found:
+ id->fs_type = SWAP;
+ id->fs_name = "swap";
+
+ return 0;
+}
+
+/* probe volume for filesystem type and try to read label+uuid */
+int volume_id_probe(struct volume_id *id, enum filesystem_type fs_type)
+{
+ int rc;
+
+ if (id == NULL)
+ return -EINVAL;
+
+ if (open_superblock(id) != 0)
+ return -EACCES;
+
+ switch (fs_type) {
+ case EXT3:
+ case EXT2:
+ rc = probe_ext(id);
+ break;
+ case REISER:
+ rc = probe_reiser(id);
+ break;
+ case XFS:
+ rc = probe_xfs(id);
+ break;
+ case JFS:
+ rc = probe_jfs(id);
+ break;
+ case MSDOS:
+ rc = probe_msdos(id);
+ break;
+ case VFAT:
+ rc = probe_vfat(id);
+ break;
+ case NTFS:
+ rc = probe_ntfs(id);
+ break;
+ case SWAP:
+ rc = probe_swap(id);
+ break;
+ default:
+ rc = probe_ext(id);
+ if (rc == 0)
+ break;
+ rc = probe_reiser(id);
+ if (rc == 0)
+ break;
+ rc = probe_xfs(id);
+ if (rc == 0)
+ break;
+ rc = probe_jfs(id);
+ if (rc == 0)
+ break;
+ rc = probe_msdos(id);
+ if (rc == 0)
+ break;
+ rc = probe_vfat(id);
+ if (rc == 0)
+ break;
+ rc = probe_ntfs(id);
+ if (rc == 0)
+ break;
+ rc = probe_swap(id);
+ if (rc == 0)
+ break;
+ rc = -1;
+ }
+
+ if (rc == 0)
+ close_superblock(id);
+
+ return rc;
+}
+
+/* open volume by already open file descriptor */
+struct volume_id *volume_id_open_fd(int fd)
+{
+ struct volume_id *id;
+
+ id = malloc(sizeof(struct volume_id));
+ if (id == NULL)
+ return NULL;
+ memset(id, 0x00, sizeof(struct volume_id));
+
+ id->fd = fd;
+
+ return id;
+}
+
+/* open volume by device node */
+struct volume_id *volume_id_open_node(const char *path)
+{
+ struct volume_id *id;
+ int fd;
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+
+ id = volume_id_open_fd(fd);
+ if (id == NULL)
+ return NULL;
+
+ /* close fd on device close */
+ id->fd_close = 1;
+
+ return id;
+}
+
+/* open volume by major/minor */
+struct volume_id *volume_id_open_dev_t(dev_t devt)
+{
+ struct volume_id *id;
+ char tmp_node[VOLUME_ID_PATH_MAX];
+
+ snprintf(tmp_node, VOLUME_ID_PATH_MAX,
+ "/tmp/volume-%u-%u", major(devt), minor(devt));
+ tmp_node[VOLUME_ID_PATH_MAX] = '\0';
+
+ /* create tempory node to open the block device */
+ if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
+ return NULL;
+
+ id = volume_id_open_node(tmp_node);
+
+ unlink(tmp_node);
+
+ return id;
+}
+
+/* free allocated volume info */
+void volume_id_close(struct volume_id *id)
+{
+ if (id == NULL)
+ return;
+
+ if (id->fd_close != 0)
+ close(id->fd);
+
+ close_superblock(id);
+
+ free(id);
+}
diff --git a/extras/volume_id/volume_id.h b/extras/volume_id/volume_id.h
new file mode 100644
index 0000000000..a0d2acda22
--- /dev/null
+++ b/extras/volume_id/volume_id.h
@@ -0,0 +1,72 @@
+/*
+ * volume_id - reads partition label and uuid
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * 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 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.
+ *
+ */
+
+#ifndef _VOLUME_ID_H_
+#define _VOLUME_ID_H_
+
+#define VOLUME_ID_VERSION 001
+
+#define VOLUME_ID_LABEL_SIZE 16
+#define VOLUME_ID_UUID_SIZE 16
+#define VOLUME_ID_UUID_STRING_SIZE 37
+#define VOLUME_ID_PATH_MAX 255
+
+
+enum filesystem_type {
+ ALL,
+ EXT2,
+ EXT3,
+ REISER,
+ XFS,
+ JFS,
+ MSDOS,
+ VFAT,
+ NTFS,
+ SWAP
+};
+
+struct volume_id {
+ char label[VOLUME_ID_LABEL_SIZE];
+ char label_string[VOLUME_ID_LABEL_SIZE+1];
+ unsigned char uuid[VOLUME_ID_UUID_SIZE];
+ char uuid_string[VOLUME_ID_UUID_STRING_SIZE];
+ enum filesystem_type fs_type;
+ char *fs_name;
+ int fd;
+ char *buf;
+ int fd_close;
+};
+
+/* open volume by already open file descriptor */
+extern struct volume_id *volume_id_open_fd(int fd);
+
+/* open volume by device node */
+extern struct volume_id *volume_id_open_node(const char *path);
+
+/* open volume by major/minor */
+extern struct volume_id *volume_id_open_dev_t(dev_t devt);
+
+/* probe volume for filesystem type and try to read label/uuid */
+extern int volume_id_probe(struct volume_id *id, enum filesystem_type fs_type);
+
+/* free allocated device info */
+extern void volume_id_close(struct volume_id *id);
+
+#endif