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init: add support for root devices specified by partition UUID

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This is the third patch in a series which adds support for
storing partition metadata, optionally, off of the hd_struct.

One major use for that data is being able to resolve partition
by other identities than just the index on a block device.  Device
enumeration varies by platform and there's a benefit to being able
to use something like EFI GPT's GUIDs to determine the correct
block device and partition to mount as the root.

This change adds that support to root= by adding support for
the following syntax:

  root=PARTUUID=hex-uuid

Signed-off-by: Will Drewry <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Will Drewry 2010-08-31 15:47:07 -05:00 • committed by Jens Axboe
commit b5af921ec0
2 changed files with 73 additions and 2 deletions
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9
block/genhd.c
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@ -642,6 +642,7 @@ void __init printk_all_partitions(void)
struct hd_struct *part;
char name_buf[BDEVNAME_SIZE];
char devt_buf[BDEVT_SIZE];
u8 uuid[PARTITION_META_INFO_UUIDLTH * 2 + 1];
/*
* Don't show empty devices or things that have been
@ -660,10 +661,14 @@ void __init printk_all_partitions(void)
while ((part = disk_part_iter_next(&piter))) {
bool is_part0 = part == &disk->part0;
printk("%s%s %10llu %s", is_part0 ? "" : " ",
uuid[0] = 0;
if (part->info)
part_unpack_uuid(part->info->uuid, uuid);
printk("%s%s %10llu %s %s", is_part0 ? "" : " ",
bdevt_str(part_devt(part), devt_buf),
(unsigned long long)part->nr_sects >> 1,
disk_name(disk, part->partno, name_buf));
disk_name(disk, part->partno, name_buf), uuid);
if (is_part0) {
if (disk->driverfs_dev != NULL &&
disk->driverfs_dev->driver != NULL)