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Diffstat (limited to 'mount/get_label_uuid.c')
-rw-r--r--mount/get_label_uuid.c162
1 files changed, 96 insertions, 66 deletions
diff --git a/mount/get_label_uuid.c b/mount/get_label_uuid.c
index 411e6a847..8b5942f71 100644
--- a/mount/get_label_uuid.c
+++ b/mount/get_label_uuid.c
@@ -1,6 +1,6 @@
#ifndef HAVE_BLKID
/*
- * Get label. Used by both mount and umount.
+ * Get label. Used by mount, umount and swapon.
*/
#include <stdio.h>
#include <fcntl.h>
@@ -8,8 +8,10 @@
#include <stdlib.h>
#include <string.h>
+#include "xmalloc.h"
#include "linux_fs.h"
#include "get_label_uuid.h"
+#include "../disk-utils/swapheader.h"
/*
* See whether this device has (the magic of) a RAID superblock at the end.
@@ -60,15 +62,48 @@ reiserfs_magic_version(const char *magic) {
return rc;
}
+static void
+store_uuid(char *udest, char *usrc) {
+ if (usrc)
+ memcpy(udest, usrc, 16);
+ else
+ memset(udest, 0, 16);
+}
+
+static void
+store_label(char **ldest, char *lsrc, int len) {
+ *ldest = xmalloc(len+1);
+ memset(*ldest, 0, len+1);
+ memcpy(*ldest, lsrc, len);
+}
+
+static int
+is_v1_swap_partition(int fd, char **label, char *uuid) {
+ int n = getpagesize();
+ char *buf = xmalloc(n);
+ struct swap_header_v1_2 *p = (struct swap_header_v1_2 *) buf;
+
+ if (lseek(fd, 0, SEEK_SET) == 0
+ && read(fd, buf, n) == n
+ && !strncmp(buf+n-10, "SWAPSPACE2", 10)
+ && p->version == 1) {
+ store_uuid(uuid, p->uuid);
+ store_label(label, p->volume_name, 16);
+ return 1;
+ }
+ return 0;
+}
+
+
/*
* Get both label and uuid.
- * For now, only ext2, ext3, xfs, ocfs, ocfs2, reiserfs are supported
+ * For now, only ext2, ext3, xfs, ocfs, ocfs2, reiserfs, swap are supported
+ *
+ * Return 0 on success.
*/
int
get_label_uuid(const char *device, char **label, char *uuid) {
int fd;
- int rv = 1;
- size_t namesize;
struct ext2_super_block e2sb;
struct xfs_super_block xfsb;
struct jfs_super_block jfssb;
@@ -76,47 +111,50 @@ get_label_uuid(const char *device, char **label, char *uuid) {
struct ocfs_volume_label olbl;
struct ocfs2_super_block osb;
struct reiserfs_super_block reiserfssb;
+ int blksize;
+ int rv = 0;
fd = open(device, O_RDONLY);
if (fd < 0)
- return rv;
+ return -1;
/* If there is a RAID partition, or an error, ignore this partition */
if (is_raid_partition(fd)) {
- close(fd);
- return rv;
+ rv = 1;
+ goto done;
}
+ if (is_v1_swap_partition(fd, label, uuid))
+ goto done;
+
if (lseek(fd, 1024, SEEK_SET) == 1024
&& read(fd, (char *) &e2sb, sizeof(e2sb)) == sizeof(e2sb)
&& (ext2magic(e2sb) == EXT2_SUPER_MAGIC)) {
- memcpy(uuid, e2sb.s_uuid, sizeof(e2sb.s_uuid));
- namesize = sizeof(e2sb.s_volume_name);
- if ((*label = calloc(namesize + 1, 1)) != NULL)
- memcpy(*label, e2sb.s_volume_name, namesize);
- rv = 0;
+ store_uuid(uuid, e2sb.s_uuid);
+ store_label(label, e2sb.s_volume_name,
+ sizeof(e2sb.s_volume_name));
+ goto done;
}
- else if (lseek(fd, 0, SEEK_SET) == 0
+
+ if (lseek(fd, 0, SEEK_SET) == 0
&& read(fd, (char *) &xfsb, sizeof(xfsb)) == sizeof(xfsb)
&& (strncmp(xfsb.s_magic, XFS_SUPER_MAGIC, 4) == 0)) {
- memcpy(uuid, xfsb.s_uuid, sizeof(xfsb.s_uuid));
- namesize = sizeof(xfsb.s_fname);
- if ((*label = calloc(namesize + 1, 1)) != NULL)
- memcpy(*label, xfsb.s_fname, namesize);
- rv = 0;
+ store_uuid(uuid, xfsb.s_uuid);
+ store_label(label, xfsb.s_fname, sizeof(xfsb.s_fname));
+ goto done;
}
- else if (lseek(fd, 0, SEEK_SET) == 0
+
+ if (lseek(fd, 0, SEEK_SET) == 0
&& read(fd, (char *) &ovh, sizeof(ovh)) == sizeof(ovh)
&& (strncmp(ovh.signature, OCFS_MAGIC, sizeof(OCFS_MAGIC)) == 0)
&& (lseek(fd, 512, SEEK_SET) == 512)
&& read(fd, (char *) &olbl, sizeof(olbl)) == sizeof(olbl)) {
- uuid[0] = '\0';
- namesize = ocfslabellen(olbl);
- if ((*label = calloc(namesize + 1, 1)) != NULL)
- memcpy(*label, olbl.label, namesize);
- rv = 0;
+ store_uuid(uuid, NULL);
+ store_label(label, olbl.label, ocfslabellen(olbl));
+ goto done;
}
- else if (lseek(fd, JFS_SUPER1_OFF, SEEK_SET) == JFS_SUPER1_OFF
+
+ if (lseek(fd, JFS_SUPER1_OFF, SEEK_SET) == JFS_SUPER1_OFF
&& read(fd, (char *) &jfssb, sizeof(jfssb)) == sizeof(jfssb)
&& (strncmp(jfssb.s_magic, JFS_MAGIC, 4) == 0)) {
@@ -136,55 +174,47 @@ get_label_uuid(const char *device, char **label, char *uuid) {
if (assemble4le(jfssb.s_version) == 1 &&
strncmp(jfssb.s_label, jfssb.s_fpack, 11) != 0) {
- memset(uuid, 0, 16);
- namesize = sizeof(jfssb.s_fpack);
- if ((*label = calloc(namesize + 1, 1)) != NULL)
- memcpy(*label, jfssb.s_fpack, namesize);
+ store_uuid(uuid, NULL);
+ store_label(label, jfssb.s_fpack,
+ sizeof(jfssb.s_fpack));
} else {
- memcpy(uuid, jfssb.s_uuid, sizeof(jfssb.s_uuid));
- namesize = sizeof(jfssb.s_label);
- if ((*label = calloc(namesize + 1, 1)) != NULL)
- memcpy(*label, jfssb.s_label, namesize);
+ store_uuid(uuid, jfssb.s_uuid);
+ store_label(label, jfssb.s_label,
+ sizeof(jfssb.s_label));
}
- rv = 0;
+ goto done;
}
- else if (lseek(fd, REISERFS_DISK_OFFSET_IN_BYTES, SEEK_SET)
- == REISERFS_DISK_OFFSET_IN_BYTES
+
+ if (lseek(fd, REISERFS_DISK_OFFSET_IN_BYTES, SEEK_SET)
+ == REISERFS_DISK_OFFSET_IN_BYTES
&& read(fd, (char *) &reiserfssb, sizeof(reiserfssb))
- == sizeof(reiserfssb)
- /* Only 3.6.x format supers have labels or uuids.
- Label and UUID can be set by reiserfstune -l/-u. */
+ == sizeof(reiserfssb)
+ /* Only 3.6.x format supers have labels or uuids.
+ Label and UUID can be set by reiserfstune -l/-u. */
&& reiserfs_magic_version(reiserfssb.s_magic) > 1) {
- namesize = sizeof (reiserfssb.s_label);
- if ((*label = calloc(namesize + 1, 1)) != NULL)
- memcpy(*label, reiserfssb.s_label, namesize);
- memcpy(uuid, reiserfssb.s_uuid, sizeof (reiserfssb.s_uuid));
- rv = 0;
+ store_uuid(uuid, reiserfssb.s_uuid);
+ store_label(label, reiserfssb.s_label,
+ sizeof(reiserfssb.s_label));
+ goto done;
}
- else {
- int blksize, blkoff;
-
- for (blksize = OCFS2_MIN_BLOCKSIZE;
- blksize <= OCFS2_MAX_BLOCKSIZE;
- blksize <<= 1) {
- blkoff = blksize * OCFS2_SUPER_BLOCK_BLKNO;
- if (lseek(fd, blkoff, SEEK_SET) == blkoff
- && read(fd, (char *) &osb, sizeof(osb))
- == sizeof(osb)
- && strncmp(osb.signature,
- OCFS2_SUPER_BLOCK_SIGNATURE,
- sizeof(OCFS2_SUPER_BLOCK_SIGNATURE))
- == 0) {
- memcpy(uuid, osb.s_uuid, sizeof(osb.s_uuid));
- namesize = sizeof(osb.s_label);
- if ((*label = calloc(namesize, 1)) != NULL)
- memcpy(*label, osb.s_label, namesize);
- rv = 0;
- break;
- }
+
+ for (blksize = OCFS2_MIN_BLOCKSIZE;
+ blksize <= OCFS2_MAX_BLOCKSIZE;
+ blksize <<= 1) {
+ int blkoff = blksize * OCFS2_SUPER_BLOCK_BLKNO;
+
+ if (lseek(fd, blkoff, SEEK_SET) == blkoff
+ && read(fd, (char *) &osb, sizeof(osb)) == sizeof(osb)
+ && strncmp(osb.signature,
+ OCFS2_SUPER_BLOCK_SIGNATURE,
+ sizeof(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
+ store_uuid(uuid, osb.s_uuid);
+ store_label(label, osb.s_label, sizeof(osb.s_label));
+ goto done;
}
}
-
+ rv = 1;
+ done:
close(fd);
return rv;
}
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-09 22:48:21 +0200