Commit d18d7682 authored by Fabio Massimo Di Nitto's avatar Fabio Massimo Di Nitto Committed by David S. Miller
Browse files

[PARTITION]: Add whole_disk attribute. 



Some partitioning systems create special partitions that
span the entire disk.  One example are Sun partitions, and
this whole-disk partition exists to tell the firmware the
extent of the entire device so it can load the boot block
and do other things.

Such partitions should not be treated as normal partitions,
because all the other partitions overlap this whole-disk one.
So we'd see multiple instances of the same UUID etc. which
we do not want.  udev and friends can thus search for this
'whole_disk' attribute and use it to decide to ignore the
partition.

Signed-off-by: default avatarFabio Massimo Di Nitto <fabbione@ubuntu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 66efc5a7

block/ioctl.c

+1 −1
Original line number Diff line number Diff line
@@ -61,7 +61,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user 
				}

			}

			/* all seems OK */

			add_partition(disk, part, start, length);

			add_partition(disk, part, start, length, ADDPART_FLAG_NONE);

			mutex_unlock(&bdev->bd_mutex);

			return 0;

		case BLKPG_DEL_PARTITION:

fs/partitions/check.c

+12 −3
Original line number Diff line number Diff line
@@ -365,7 +365,7 @@ void delete_partition(struct gendisk *disk, int part) 
	kobject_put(&p->kobj);

}



void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)

void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)

{

	struct hd_struct *p;
@@ -390,6 +390,15 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len) 
	if (!disk->part_uevent_suppress)

		kobject_uevent(&p->kobj, KOBJ_ADD);

	sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem");

	if (flags & ADDPART_FLAG_WHOLEDISK) {

		static struct attribute addpartattr = {

			.name = "whole_disk",

			.mode = S_IRUSR | S_IRGRP | S_IROTH,

			.owner = THIS_MODULE,

		};



		sysfs_create_file(&p->kobj, &addpartattr);

	}

	partition_sysfs_add_subdir(p);

	disk->part[part-1] = p;

}
@@ -543,9 +552,9 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev) 
			printk(" %s: p%d exceeds device capacity\n",

				disk->disk_name, p);

		}

		add_partition(disk, p, from, size);

		add_partition(disk, p, from, size, state->parts[p].flags);

#ifdef CONFIG_BLK_DEV_MD

		if (state->parts[p].flags)

		if (state->parts[p].flags & ADDPART_FLAG_RAID)

			md_autodetect_dev(bdev->bd_dev+p);

#endif

	}

fs/partitions/msdos.c

+1 −1
Original line number Diff line number Diff line
@@ -155,7 +155,7 @@ parse_extended(struct parsed_partitions *state, struct block_device *bdev, 


			put_partition(state, state->next, next, size);

			if (SYS_IND(p) == LINUX_RAID_PARTITION)

				state->parts[state->next].flags = 1;

				state->parts[state->next].flags = ADDPART_FLAG_RAID;

			loopct = 0;

			if (++state->next == state->limit)

				goto done;

fs/partitions/sgi.c

+1 −1
Original line number Diff line number Diff line
@@ -72,7 +72,7 @@ int sgi_partition(struct parsed_partitions *state, struct block_device *bdev) 
		if (blocks) {

			put_partition(state, slot, start, blocks);

			if (be32_to_cpu(p->type) == LINUX_RAID_PARTITION)

				state->parts[slot].flags = 1;

				state->parts[slot].flags = ADDPART_FLAG_RAID;

		}

		slot++;

	}

fs/partitions/sun.c

+4 −1
Original line number Diff line number Diff line
@@ -80,8 +80,11 @@ int sun_partition(struct parsed_partitions *state, struct block_device *bdev) 
		num_sectors = be32_to_cpu(p->num_sectors);

		if (num_sectors) {

			put_partition(state, slot, st_sector, num_sectors);

			state->parts[slot].flags = 0;

			if (label->infos[i].id == LINUX_RAID_PARTITION)

				state->parts[slot].flags = 1;

				state->parts[slot].flags |= ADDPART_FLAG_RAID;

			if (label->infos[i].id == SUN_WHOLE_DISK)

				state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;

		}

		slot++;

	}

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