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mirror of https://github.com/systemd/systemd-stable.git synced 2024-12-23 17:34:00 +03:00

[PATCH] udev_volume_id: version 27

Fix FAT label reading bug for very large volumes.
Recognize FAT label at Win98 formatted volumes.
Read iso9660 joliet descriptor for unicode labels.
Support uuid/label of swap partitions.
This commit is contained in:
kay.sievers@vrfy.org 2005-01-12 10:44:52 +01:00 committed by Greg KH
parent adf3af8c35
commit 240ce55179
2 changed files with 84 additions and 29 deletions

View File

@ -78,7 +78,7 @@
/* size of superblock buffer, reiserfs block is at 64k */
#define SB_BUFFER_SIZE 0x11000
/* size of seek buffer 4k */
#define SEEK_BUFFER_SIZE 0x1000
#define SEEK_BUFFER_SIZE 0x10000
static void set_label_raw(struct volume_id *id,
@ -221,8 +221,10 @@ static __u8 *get_buffer(struct volume_id *id, __u64 off, unsigned int len)
return &(id->sbbuf[off]);
} else {
if (len > SEEK_BUFFER_SIZE)
len = SEEK_BUFFER_SIZE;
if (len > SEEK_BUFFER_SIZE) {
dbg("seek buffer too small %d", SEEK_BUFFER_SIZE);
return NULL;
}
/* get seek buffer */
if (id->seekbuf == NULL) {
@ -232,8 +234,7 @@ static __u8 *get_buffer(struct volume_id *id, __u64 off, unsigned int len)
}
/* check if we need to read */
if ((off < id->seekbuf_off) ||
((off + len) > (id->seekbuf_off + id->seekbuf_len))) {
if ((off < id->seekbuf_off) || ((off + len) > (id->seekbuf_off + id->seekbuf_len))) {
dbg("read seekbuf off:0x%llx len:0x%x", off, len);
if (lseek(id->fd, off, SEEK_SET) == -1)
return NULL;
@ -241,8 +242,10 @@ static __u8 *get_buffer(struct volume_id *id, __u64 off, unsigned int len)
dbg("got 0x%x (%i) bytes", buf_len, buf_len);
id->seekbuf_off = off;
id->seekbuf_len = buf_len;
if (buf_len < len)
if (buf_len < len) {
dbg("requested 0x%x bytes, got only 0x%x bytes", len, buf_len);
return NULL;
}
}
return &(id->seekbuf[off - id->seekbuf_off]);
@ -571,7 +574,7 @@ static int probe_msdos_part_table(struct volume_id *id, __u64 off)
p->partition_type_raw = part[i].sys_ind;
if (id->partition_count >= VOLUME_ID_PARTITIONS_MAX) {
dbg("to many partitions");
dbg("too many partitions");
next = 0;
}
}
@ -769,7 +772,9 @@ static int probe_jfs(struct volume_id *id, __u64 off)
#define FAT12_MAX 0xff5
#define FAT16_MAX 0xfff5
#define FAT_ATTR_VOLUME 0x08
#define FAT_ATTR_VOLUME_ID 0x08
#define FAT_ATTR_DIR 0x10
#define FAT_ENTRY_FREE 0xe5
static int probe_vfat(struct volume_id *id, __u64 off)
{
struct vfat_super_block {
@ -832,7 +837,7 @@ static int probe_vfat(struct volume_id *id, __u64 off)
__u16 dir_entries;
__u32 sect_count;
__u16 reserved;
__u16 fat_size;
__u32 fat_size;
__u32 root_cluster;
__u32 dir_size;
__u32 cluster_count;
@ -959,12 +964,13 @@ valid:
}
/* empty entry */
if (dir[i].name[0] == 0xe5)
if (dir[i].name[0] == FAT_ENTRY_FREE)
continue;
if (dir[i].attr == FAT_ATTR_VOLUME) {
dbg("found ATTR_VOLUME id in root dir");
if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == FAT_ATTR_VOLUME_ID) {
dbg("found ATTR_VOLUME_ID id in root dir");
label = dir[i].name;
break;
}
dbg("skip dir entry");
@ -1017,11 +1023,11 @@ fat32:
}
/* empty entry */
if (dir[i].name[0] == 0xe5)
if (dir[i].name[0] == FAT_ENTRY_FREE)
continue;
if (dir[i].attr == FAT_ATTR_VOLUME) {
dbg("found ATTR_VOLUME id in root dir");
if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == FAT_ATTR_VOLUME_ID) {
dbg("found ATTR_VOLUME_ID id in root dir");
label = dir[i].name;
goto fat32_label;
}
@ -1047,7 +1053,7 @@ fat32_label:
if (label != NULL && strncmp(label, "NO NAME ", 11) != 0) {
set_label_raw(id, label, 11);
set_label_string(id, label, 11);
} else if (strncmp(vs->type.fat32.label, "NO NAME ", 11) == 0) {
} else if (strncmp(vs->type.fat32.label, "NO NAME ", 11) != 0) {
set_label_raw(id, vs->type.fat32.label, 11);
set_label_string(id, vs->type.fat32.label, 11);
}
@ -1214,6 +1220,12 @@ found:
}
#define ISO_SUPERBLOCK_OFFSET 0x8000
#define ISO_SECTOR_SIZE 0x800
#define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
#define ISO_VD_PRIMARY 0x1
#define ISO_VD_SUPPLEMENTARY 0x2
#define ISO_VD_END 0xff
#define ISO_VD_MAX 16
static int probe_iso9660(struct volume_id *id, __u64 off)
{
union iso_super_block {
@ -1239,8 +1251,36 @@ static int probe_iso9660(struct volume_id *id, __u64 off)
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);
int vd_offset;
int i;
int found_svd;
found_svd = 0;
vd_offset = ISO_VD_OFFSET;
for (i = 0; i < ISO_VD_MAX; i++) {
is = (union iso_super_block *)
get_buffer (id, off + vd_offset, 0x200);
if (is == NULL || is->iso.type == ISO_VD_END)
break;
if (is->iso.type == ISO_VD_SUPPLEMENTARY) {
dbg("found ISO supplementary VD at offset 0x%llx", off + vd_offset);
found_svd = 1;
break;
}
vd_offset += ISO_SECTOR_SIZE;
}
if (!found_svd) {
is = (union iso_super_block *)
get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
if (is == NULL)
return -1;
set_label_raw(id, is->iso.volume_id, 32);
set_label_string(id, is->iso.volume_id, 32);
} else {
set_label_raw(id, is->iso.volume_id, 32);
set_label_unicode16(id, is->iso.volume_id, BE, 32);
}
goto found;
}
if (strncmp(is->hs.id, "CDROM", 5) == 0)
@ -1978,21 +2018,37 @@ found:
#define LARGEST_PAGESIZE 0x4000
static int probe_swap(struct volume_id *id, __u64 off)
{
const __u8 *sig;
struct swap_header_v1_2 {
__u8 bootbits[1024];
__u32 version;
__u32 last_page;
__u32 nr_badpages;
__u8 uuid[16];
__u8 volume_name[16];
} __attribute__((__packed__)) *sw;
const __u8 *buf;
unsigned int page;
/* huhh, the swap signature is on the end of the PAGE_SIZE */
/* the swap signature is at the end of the PAGE_SIZE */
for (page = 0x1000; page <= LARGEST_PAGESIZE; page <<= 1) {
sig = get_buffer(id, off + page-10, 10);
if (sig == NULL)
buf = get_buffer(id, off + page-10, 10);
if (buf == NULL)
return -1;
if (strncmp(sig, "SWAP-SPACE", 10) == 0) {
if (strncmp(buf, "SWAP-SPACE", 10) == 0) {
strcpy(id->type_version, "1");
goto found;
}
if (strncmp(sig, "SWAPSPACE2", 10) == 0) {
if (strncmp(buf, "SWAPSPACE2", 10) == 0) {
sw = (struct swap_header_v1_2 *) get_buffer(id, off, sizeof(struct swap_header_v1_2));
if (sw == NULL)
return -1;
strcpy(id->type_version, "2");
set_label_raw(id, sw->volume_name, 16);
set_label_string(id, sw->volume_name, 16);
set_uuid(id, sw->uuid, UUID_DCE);
goto found;
}
}
@ -2014,6 +2070,8 @@ int volume_id_probe(struct volume_id *id,
{
int rc;
dbg("called with size=0x%llx", size);
if (id == NULL)
return -EINVAL;
@ -2088,9 +2146,6 @@ int volume_id_probe(struct volume_id *id,
break;
/* signature in the first block, only small buffer needed */
rc = probe_msdos_part_table(id, off);
if (rc == 0)
break;
rc = probe_vfat(id, off);
if (rc == 0)
break;

View File

@ -21,14 +21,14 @@
#ifndef _VOLUME_ID_H_
#define _VOLUME_ID_H_
#define VOLUME_ID_VERSION 26
#define VOLUME_ID_VERSION 27
#define VOLUME_ID_LABEL_SIZE 64
#define VOLUME_ID_UUID_SIZE 16
#define VOLUME_ID_UUID_STRING_SIZE 37
#define VOLUME_ID_FORMAT_SIZE 32
#define VOLUME_ID_PATH_MAX 256
#define VOLUME_ID_PARTITIONS_MAX 16
#define VOLUME_ID_PARTITIONS_MAX 256
enum volume_id_usage {
VOLUME_ID_UNUSED,