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Commit 0fc71e3d authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

block: add partition attribute for partition number 



With extended devt, finding out the partition number becomes a bit
more challenging as subtracting the minor number from that of the
parent device doesn't work anymore.  The only thing left is parsing
the partition name which is brittle and not exactly universal (some
have '-' between the device name and partition number while others
don't).  This patch introduced partition attribute which contains the
partition number of the device.  This should make finding partitions
and its index easier.

This problem and solution were suggested by H. Peter Anvin.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 0e11e342

fs/partitions/check.c

+10 −0
Original line number Original line Diff line number Diff line
@@ -195,6 +195,14 @@ check_partition(struct gendisk *hd, struct block_device *bdev) 
	return ERR_PTR(res);

	return ERR_PTR(res);

}

}





static ssize_t part_partition_show(struct device *dev,

				   struct device_attribute *attr, char *buf)

{

	struct hd_struct *p = dev_to_part(dev);



	return sprintf(buf, "%d\n", p->partno);

}



static ssize_t part_start_show(struct device *dev,

static ssize_t part_start_show(struct device *dev,

			       struct device_attribute *attr, char *buf)

			       struct device_attribute *attr, char *buf)

{

{
@@ -260,6 +268,7 @@ ssize_t part_fail_store(struct device *dev, 
}

}

#endif

#endif





static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);

static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);

static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);

static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);

static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);

static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);

static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
@@ -269,6 +278,7 @@ static struct device_attribute dev_attr_fail = 
#endif

#endif





static struct attribute *part_attrs[] = {

static struct attribute *part_attrs[] = {

	&dev_attr_partition.attr,

	&dev_attr_start.attr,

	&dev_attr_start.attr,

	&dev_attr_size.attr,

	&dev_attr_size.attr,

	&dev_attr_stat.attr,

	&dev_attr_stat.attr,