From: Mike Anderson <andmike@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Alasdair G Kergon <agk@xxxxxxxxxx>
---
drivers/md/dm-table.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)
Index: linux-2.6.21/drivers/md/dm-table.c
===================================================================
--- linux-2.6.21.orig/drivers/md/dm-table.c 2007-05-01 17:40:45.000000000 +0100
+++ linux-2.6.21/drivers/md/dm-table.c 2007-05-01 17:40:50.000000000 +0100
@@ -428,13 +428,15 @@ 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)));
}
--
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