This patch implements UUID support for FAT (both 12/16 and 32).
--
Robert Millan
<GPLv2> I know my rights; I want my phone call!
<DRM> What good is a phone call… if you are unable to speak?
(as seen on /.)
2008-05-31 Robert Millan <[EMAIL PROTECTED]>
* fs/fat.c (struct grub_fat_bpb): Move fat32-specific fields into a
union with fat12/fat16-specific ones. Add some new fields, including
`num_serial' for both versions.
(struct grub_fat_data): Add `uuid' member.
(grub_fat_mount): Refer to fat32-specific fields in `bpb' by their new
names. Initialize `data->uuid' using `num_serial'.
(grub_fat_uuid): New function.
(grub_fat_fs): Reference grub_fat_uuid() in `uuid' struct member.
diff -x configure -x config.h.in -x CVS -x '*~' -x '*.mk' -urp ../grub2/fs/fat.c ./fs/fat.c
--- ../grub2/fs/fat.c 2007-08-02 20:40:36.000000000 +0200
+++ ./fs/fat.c 2008-05-31 22:59:11.000000000 +0200
@@ -61,14 +61,34 @@ struct grub_fat_bpb
grub_uint16_t num_heads;
grub_uint32_t num_hidden_sectors;
grub_uint32_t num_total_sectors_32;
-
- /* The following fields are only used by FAT32. */
- grub_uint32_t sectors_per_fat_32;
- grub_uint16_t extended_flags;
- grub_uint16_t fs_version;
- grub_uint32_t root_cluster;
- grub_uint16_t fs_info;
- grub_uint16_t backup_boot_sector;
+ union
+ {
+ struct
+ {
+ grub_uint8_t num_ph_drive;
+ grub_uint8_t reserved;
+ grub_uint8_t boot_sig;
+ grub_uint32_t num_serial;
+ grub_uint8_t label[11];
+ grub_uint8_t fstype[8];
+ } __attribute__ ((packed)) fat12_or_fat16;
+ struct
+ {
+ grub_uint32_t sectors_per_fat_32;
+ grub_uint16_t extended_flags;
+ grub_uint16_t fs_version;
+ grub_uint32_t root_cluster;
+ grub_uint16_t fs_info;
+ grub_uint16_t backup_boot_sector;
+ grub_uint8_t reserved[12];
+ grub_uint8_t num_ph_drive;
+ grub_uint8_t reserved1;
+ grub_uint8_t boot_sig;
+ grub_uint32_t num_serial;
+ grub_uint8_t label[11];
+ grub_uint8_t fstype[8];
+ } __attribute__ ((packed)) fat32;
+ } __attribute__ ((packed)) version_specific;
} __attribute__ ((packed));
struct grub_fat_dir_entry
@@ -122,6 +142,8 @@ struct grub_fat_data
grub_uint32_t file_cluster;
grub_uint32_t cur_cluster_num;
grub_uint32_t cur_cluster;
+
+ grub_uint16_t uuid[2];
};
#ifndef GRUB_UTIL
@@ -183,7 +205,7 @@ grub_fat_mount (grub_disk_t disk)
data->sectors_per_fat = ((bpb.sectors_per_fat_16
? grub_le_to_cpu16 (bpb.sectors_per_fat_16)
- : grub_le_to_cpu32 (bpb.sectors_per_fat_32))
+ : grub_le_to_cpu32 (bpb.version_specific.fat32.sectors_per_fat_32))
<< data->logical_sector_bits);
if (data->sectors_per_fat == 0)
goto fail;
@@ -219,9 +241,9 @@ grub_fat_mount (grub_disk_t disk)
if (! bpb.sectors_per_fat_16)
{
/* FAT32. */
- grub_uint16_t flags = grub_le_to_cpu16 (bpb.extended_flags);
+ grub_uint16_t flags = grub_le_to_cpu16 (bpb.version_specific.fat32.extended_flags);
- data->root_cluster = grub_le_to_cpu32 (bpb.root_cluster);
+ data->root_cluster = grub_le_to_cpu32 (bpb.version_specific.fat32.root_cluster);
data->fat_size = 32;
data->cluster_eof_mark = 0x0ffffff8;
@@ -236,7 +258,7 @@ grub_fat_mount (grub_disk_t disk)
data->fat_sector += active_fat * data->sectors_per_fat;
}
- if (bpb.num_root_entries != 0 || bpb.fs_version != 0)
+ if (bpb.num_root_entries != 0 || bpb.version_specific.fat32.fs_version != 0)
goto fail;
}
else
@@ -286,6 +308,12 @@ grub_fat_mount (grub_disk_t disk)
first_fat &= 0x00000fff;
magic = 0x0f00;
}
+
+ /* Serial number. */
+ if (bpb.sectors_per_fat_16)
+ *((grub_uint32_t *) &data->uuid) = grub_le_to_cpu32 (bpb.version_specific.fat12_or_fat16.num_serial);
+ else
+ *((grub_uint32_t *) &data->uuid) = grub_le_to_cpu32 (bpb.version_specific.fat32.num_serial);
/* Ignore the 3rd bit, because some BIOSes assigns 0xF0 to the media
descriptor, even if it is a so-called superfloppy (e.g. an USB key).
@@ -797,6 +825,34 @@ grub_fat_label (grub_device_t device, ch
return grub_errno;
}
+static grub_err_t
+grub_fat_uuid (grub_device_t device, char **uuid)
+{
+ struct grub_fat_data *data;
+ grub_disk_t disk = device->disk;
+
+#ifndef GRUB_UTIL
+ grub_dl_ref (my_mod);
+#endif
+
+ data = grub_fat_mount (disk);
+ if (data)
+ {
+ *uuid = grub_malloc (40 + sizeof ('\0'));
+ grub_sprintf (*uuid, "%04x-%04x", data->uuid[1], data->uuid[0]);
+ }
+ else
+ *uuid = NULL;
+
+#ifndef GRUB_UTIL
+ grub_dl_unref (my_mod);
+#endif
+
+ grub_free (data);
+
+ return grub_errno;
+}
+
static struct grub_fs grub_fat_fs =
{
.name = "fat",
@@ -805,6 +861,7 @@ static struct grub_fs grub_fat_fs =
.read = grub_fat_read,
.close = grub_fat_close,
.label = grub_fat_label,
+ .uuid = grub_fat_uuid,
.next = 0
};
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