volume_id: add md metadata 1.0, 1.1, 1.2 support

[elogind.git] / extras / volume_id / lib / linux_raid.c

diff --git a/extras/volume_id/lib/linux_raid.c b/extras/volume_id/lib/linux_raid.c
index a9c5d61adca9b20f83799e7eb97e020061844abe..009c714bd1d54fb8445e334f80f891f28bb5425a 100644 (file)
--- a/extras/volume_id/lib/linux_raid.c
+++ b/extras/volume_id/lib/linux_raid.c
@@ -22,12 +22,13 @@
 #include <string.h>
 #include <errno.h>
 #include <ctype.h>
+#include <byteswap.h>
 
 #include "libvolume_id.h"
 #include "util.h"
 
-static struct mdp_super_block {
-       uint8_t         md_magic[4];
+static struct mdp0_super_block {
+       uint32_t        md_magic;
        uint32_t        major_version;
        uint32_t        minor_version;
        uint32_t        patch_version;
@@ -43,42 +44,109 @@ static struct mdp_super_block {
        uint32_t        set_uuid1;
        uint32_t        set_uuid2;
        uint32_t        set_uuid3;
-} PACKED *mdp;
+} PACKED *mdp0;
+
+struct mdp1_super_block {
+       uint32_t        magic;
+       uint32_t        major_version;
+       uint32_t        feature_map;
+       uint32_t        pad0;
+       uint8_t         set_uuid[16];
+       uint8_t         set_name[32];
+} PACKED *mdp1;
 
 #define MD_RESERVED_BYTES              0x10000
-#define MD_MAGIC                       "\xfc\x4e\x2b\xa9"
-#define MD_MAGIC_SWAP                  "\xa9\x2b\x4e\xfc"
+#define MD_SB_MAGIC                    0xa92b4efc
 
-int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size)
+static int volume_id_probe_linux_raid0(struct volume_id *id, uint64_t off, uint64_t size)
 {
        const uint8_t *buf;
-       uint64_t sboff;
-       uint8_t uuid[16];
+       union {
+               uint32_t ints[4];
+               uint8_t bytes[16];
+       } uuid;
 
        info("probing at offset 0x%llx, size 0x%llx",
            (unsigned long long) off, (unsigned long long) size);
        if (size < 0x10000)
                return -1;
 
-       sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
-       buf = volume_id_get_buffer(id, off + sboff, 0x800);
+       buf = volume_id_get_buffer(id, off, 0x800);
+       if (buf == NULL)
+               return -1;
+       mdp0 = (struct mdp0_super_block *) buf;
+
+       if (le32_to_cpu(mdp0->md_magic) == MD_SB_MAGIC) {
+               uuid.ints[0] = bswap_32(mdp0->set_uuid0);
+               uuid.ints[1] = bswap_32(mdp0->set_uuid1);
+               uuid.ints[2] = bswap_32(mdp0->set_uuid2);
+               uuid.ints[3] = bswap_32(mdp0->set_uuid3);
+               volume_id_set_uuid(id, uuid.bytes, UUID_DCE);
+               snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
+                        le32_to_cpu(mdp0->major_version),
+                        le32_to_cpu(mdp0->minor_version),
+                        le32_to_cpu(mdp0->patch_version));
+       } else if (be32_to_cpu(mdp0->md_magic) == MD_SB_MAGIC) {
+               uuid.ints[0] = mdp0->set_uuid0;
+               uuid.ints[1] = mdp0->set_uuid1;
+               uuid.ints[2] = mdp0->set_uuid2;
+               uuid.ints[3] = mdp0->set_uuid3;
+               volume_id_set_uuid(id, uuid.bytes, UUID_DCE);
+               snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
+                        be32_to_cpu(mdp0->major_version),
+                        be32_to_cpu(mdp0->minor_version),
+                        be32_to_cpu(mdp0->patch_version));
+       } else
+               return -1;
+
+       volume_id_set_usage(id, VOLUME_ID_RAID);
+       id->type = "linux_raid_member";
+       return 0;
+}
+
+static int volume_id_probe_linux_raid1(struct volume_id *id, uint64_t off, uint64_t size)
+{
+       const uint8_t *buf;
+
+       info("probing at offset 0x%llx, size 0x%llx",
+           (unsigned long long) off, (unsigned long long) size);
+
+       buf = volume_id_get_buffer(id, off, 0x800);
        if (buf == NULL)
                return -1;
-       mdp = (struct mdp_super_block *) buf;
+       mdp1 = (struct mdp1_super_block *) buf;
 
-       if ((memcmp(mdp->md_magic, MD_MAGIC, 4) != 0) &&
-           (memcmp(mdp->md_magic, MD_MAGIC_SWAP, 4) != 0))
+       if (le32_to_cpu(mdp1->magic) != MD_SB_MAGIC)
                return -1;
 
-       memcpy(uuid, &mdp->set_uuid0, 4);
-       memcpy(&uuid[4], &mdp->set_uuid1, 12);
-       volume_id_set_uuid(id, uuid, UUID_DCE);
-       snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
-                le32_to_cpu(mdp->major_version),
-                le32_to_cpu(mdp->minor_version),
-                le32_to_cpu(mdp->patch_version));
-       dbg("found raid signature");
+       volume_id_set_uuid(id, mdp1->set_uuid, UUID_DCE);
+       volume_id_set_label_raw(id, mdp1->set_name, 32);
+       volume_id_set_label_string(id, mdp1->set_name, 32);
+       snprintf(id->type_version, sizeof(id->type_version)-1, "%u", le32_to_cpu(mdp1->major_version));
        volume_id_set_usage(id, VOLUME_ID_RAID);
        id->type = "linux_raid_member";
        return 0;
 }
+
+int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size)
+{
+       uint64_t sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
+
+       /* version 0 at the end of the device */
+       if (volume_id_probe_linux_raid0(id, off + sboff, size) == 0)
+               return 0;
+
+       /* version 1.0 at the end of the device */
+       if (volume_id_probe_linux_raid1(id, off + sboff, size) == 0)
+               return 0;
+
+       /* version 1.1 at the start of the device */
+       if (volume_id_probe_linux_raid1(id, off, size) == 0)
+               return 0;
+
+       /* version 1.2 at 4k offset from the start */
+       if (volume_id_probe_linux_raid1(id, off + 0x1000, size) == 0)
+               return 0;
+
+       return -1;
+}