From: Mike Anderson 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 Signed-off-by: Alasdair G Kergon Signed-off-by: Andrew Morton --- drivers/md/dm-table.c | 10 ++++++---- 1 files changed, 6 insertions(+), 4 deletions(-) diff -puN drivers/md/dm-table.c~dm-allow-offline-devices drivers/md/dm-table.c --- a/drivers/md/dm-table.c~dm-allow-offline-devices +++ a/drivers/md/dm-table.c @@ -425,13 +425,15 @@ static void close_dev(struct dm_dev *d, } /* - * 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))); } _