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Commit 2cd54d9b authored by Mike Anderson's avatar Mike Anderson Committed by Linus Torvalds
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dm: allow offline devices 



Allow check_device_area to succeed if a device has an i_size of zero.  This
addresses an issue seen on DASD devices setting up a multipath table for paths
in online and offline state.

Signed-off-by: default avatarMike Anderson <andmike@us.ibm.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 79eb885c

drivers/md/dm-table.c

+6 −4
Original line number Diff line number Diff line
@@ -425,13 +425,15 @@ static void close_dev(struct dm_dev *d, struct mapped_device *md) 
}



/*

 * If possible (ie. blk_size[major] is set), this checks an area

 * of a destination device is valid.

 * If possible, this checks an area of a destination device is valid.

 */

static int check_device_area(struct dm_dev *dd, sector_t start, sector_t len)

{

	sector_t dev_size;

	dev_size = dd->bdev->bd_inode->i_size >> SECTOR_SHIFT;

	sector_t dev_size = dd->bdev->bd_inode->i_size >> SECTOR_SHIFT;



	if (!dev_size)

		return 1;



	return ((start < dev_size) && (len <= (dev_size - start)));

}