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 <>
Signed-off-by: default avatarAlasdair G Kergon <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 79eb885c
......@@ -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)));
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