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authorMike Anderson <andmike@us.ibm.com>2007-05-09 02:32:57 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-09 12:30:47 -0700
commit2cd54d9bedb79a97f014e86c0da393416b264eb3 (patch)
treebb7b81120cdd84e106da22222b6eec57e45ac5c4 /drivers/md
parent79eb885c96b5ccf8bbffd0dddc4c15a5dd436a1c (diff)
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>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-table.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 05befa91807a..2fc199b0016b 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -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)));
}