chiark / gitweb /
volume_id: add more vfat debugging information
authorKay Sievers <kay.sievers@vrfy.org>
Mon, 6 Oct 2008 10:17:47 +0000 (12:17 +0200)
committerKay Sievers <kay.sievers@vrfy.org>
Mon, 6 Oct 2008 10:17:47 +0000 (12:17 +0200)
extras/volume_id/lib/fat.c

index e5a5cc1..9d26a98 100644 (file)
@@ -311,6 +311,7 @@ int volume_id_probe_vfat(struct volume_id *id, uint64_t off, uint64_t size)
                return -1;
 
 magic:
+       info("magic found\n");
        /* reserverd sector count */
        if (!vs->reserved)
                return -1;
@@ -333,6 +334,7 @@ magic:
        if (sector_size == 0 || ((sector_size & (sector_size-1)) != 0))
                return -1;
 
+       info("checks passed\n");
        dbg("sector_size 0x%x\n", sector_size);
        dbg("sectors_per_cluster 0x%x\n", vs->sectors_per_cluster);
 
@@ -356,7 +358,7 @@ magic:
                fat_size = fat32_length * vs->fats;
        else
                return -1;
-       dbg("fat_size 0x%x\n", fat_size);
+       info("fat_size 0x%x\n", fat_size);
 
        dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) +
                        (sector_size-1)) / sector_size;
@@ -364,7 +366,7 @@ magic:
 
        cluster_count = sect_count - (reserved + fat_size + dir_size);
        cluster_count /= vs->sectors_per_cluster;
-       dbg("cluster_count 0x%x\n", cluster_count);
+       info("cluster_count 0x%x\n", cluster_count);
 
        /* must be FAT32 */
        if (!fat_length && fat32_length)
@@ -408,16 +410,24 @@ magic:
        goto found;
 
 fat32:
+       info("looking for FAT32\n");
        /* FAT32 should have a valid signature in the fsinfo block */
        fsinfo_sect = le16_to_cpu(vs->type.fat32.fsinfo_sector);
        buf = volume_id_get_buffer(id, off + (fsinfo_sect * sector_size), 0x200);
        if (buf == NULL)
                return -1;
        fsinfo = (struct fat32_fsinfo *) buf;
+       info("signature1: 0x%02x%02x%02x%02x\n",
+            fsinfo->signature1[0], fsinfo->signature1[1],
+            fsinfo->signature1[2], fsinfo->signature1[3]);
+       info("signature2: 0x%02x%02x%02x%02x\n",
+            fsinfo->signature2[0], fsinfo->signature2[1],
+            fsinfo->signature2[2], fsinfo->signature2[3]);
        if (memcmp(fsinfo->signature1, "\x52\x52\x61\x41", 4) != 0)
                return -1;
        if (memcmp(fsinfo->signature2, "\x72\x72\x41\x61", 4) != 0)
                return -1 ;
+       info("FAT32 signatures match\n");
 
        vs = (struct vfat_super_block *) volume_id_get_buffer(id, off, 0x200);
        if (vs == NULL)