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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: Mike Anderson <andmike@us.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Anderson 2007-05-09 02:32:57 -07:00 committed by Linus Torvalds
parent 79eb885c96
commit 2cd54d9bed
1 changed files with 6 additions and 4 deletions
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10
drivers/md/dm-table.c
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@ -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)));
}