dm: allow offline devices
authorMike Anderson <andmike@us.ibm.com>
Wed, 9 May 2007 09:32:57 +0000 (02:32 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Wed, 9 May 2007 19:30:47 +0000 (12:30 -0700)
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>
drivers/md/dm-table.c

index 05befa91807a332b87676bef2cc47de92417e1eb..2fc199b0016bd5c819b42572b97dbc69dc03844c 100644 (file)
@@ -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)));
 }