Commit 56bca017 authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

block: restart partition scan after resizing a device 



Device resize via ->set_capacity() can reveal new partitions (e.g. in
chained partition table formats such as dos extended parts).  Restart
partition scan from the beginning after resizing a device.  This
change also makes libata always revalidate the disk after resize which
makes lower layer native capacity unlocking implementation simpler and
more robust as resize can be handled in the usual path.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Reported-by: default avatarBen Hutchings <ben@decadent.org.uk>
Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent fa4b9074

fs/partitions/check.c

+6 −10
Original line number Diff line number Diff line
@@ -544,7 +544,7 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev) 
	struct hd_struct *part;

	struct parsed_partitions *state;

	int p, highest, res;



rescan:

	if (bdev->bd_part_count)

		return -EBUSY;

	res = invalidate_partition(disk, 0);
@@ -581,7 +581,7 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev) 
	/* add partitions */

	for (p = 1; p < state->limit; p++) {

		sector_t size, from;

try_scan:



		size = state->parts[p].size;

		if (!size)

			continue;
@@ -596,7 +596,6 @@ try_scan: 


		if (from + size > get_capacity(disk)) {

			const struct block_device_operations *bdops = disk->fops;

			unsigned long long capacity;



			printk(KERN_WARNING

			       "%s: p%d size %llu exceeds device capacity, ",
@@ -605,14 +604,11 @@ try_scan: 
			if (bdops->set_capacity &&

			    (disk->flags & GENHD_FL_NATIVE_CAPACITY) == 0) {

				printk(KERN_CONT "enabling native capacity\n");

				capacity = bdops->set_capacity(disk, ~0ULL);

				bdops->set_capacity(disk, ~0ULL);

				disk->flags |= GENHD_FL_NATIVE_CAPACITY;

				if (capacity > get_capacity(disk)) {

					set_capacity(disk, capacity);

					check_disk_size_change(disk, bdev);

					bdev->bd_invalidated = 0;

				}

				goto try_scan;

				/* free state and restart */

				kfree(state);

				goto rescan;

			} else {

				/*

				 * we can not ignore partitions of broken tables

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