From: NeilBrown <neilb@cse.unsw.edu.au>
It is possibly (and occasionally useful) to have a raid1 without persistent
superblocks. The code in add_new_disk for adding a device to such an array
always tries to read a superblock.
This will obviously fail.
So do the appropriate test and call md_import_device with
appropriate args.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
drivers/md/md.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff -puN drivers/md/md.c~md-allow-hot-adding-devices-to-arrays-with-non-persistant-superblocks drivers/md/md.c
--- devel/drivers/md/md.c~md-allow-hot-adding-devices-to-arrays-with-non-persistant-superblocks 2005-08-30 18:46:12.000000000 -0700
+++ devel-akpm/drivers/md/md.c 2005-08-30 18:46:12.000000000 -0700
@@ -2226,8 +2226,11 @@ static int add_new_disk(mddev_t * mddev,
mdname(mddev));
return -EINVAL;
}
- rdev = md_import_device(dev, mddev->major_version,
- mddev->minor_version);
+ if (mddev->persistent)
+ rdev = md_import_device(dev, mddev->major_version,
+ mddev->minor_version);
+ else
+ rdev = md_import_device(dev, -1, -1);
if (IS_ERR(rdev)) {
printk(KERN_WARNING
"md: md_import_device returned %ld\n",
_