chiark / gitweb /
[PATCH] udev_volume_id: version 27
authorkay.sievers@vrfy.org <kay.sievers@vrfy.org>
Wed, 12 Jan 2005 09:44:52 +0000 (10:44 +0100)
committerGreg KH <gregkh@suse.de>
Wed, 27 Apr 2005 06:21:58 +0000 (23:21 -0700)
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.

extras/volume_id/volume_id.c
extras/volume_id/volume_id.h

index 42d6588..e28c730 100644 (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;
index d135f44..c26d1e4 100644 (file)
 #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,