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[PARTITION]: Add whole_disk attribute.

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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: Fabio Massimo Di Nitto <fabbione@ubuntu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Fabio Massimo Di Nitto
2007-02-10 23:50:00 -08:00
committed by David S. Miller
parent 66efc5a7e3
commit d18d7682c1
6 changed files with 26 additions and 8 deletions
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15
fs/partitions/check.c
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@@ -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
}