[PATCH] md: allow hot-adding devices to arrays with non-persistant superblocks.
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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index f1ac356..866c704 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2226,8 +2226,11 @@
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",