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[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>
This commit is contained in:
NeilBrown 2005-09-09 16:23:50 -07:00 committed by Linus Torvalds
parent 3178b0dbdf
commit 7b1e35f6d6
1 changed files with 5 additions and 2 deletions
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7
drivers/md/md.c
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@ -2226,8 +2226,11 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
mdname(mddev)); mdname(mddev));
return -EINVAL; return -EINVAL;
} }
rdev = md_import_device(dev, mddev->major_version, if (mddev->persistent)
mddev->minor_version); rdev = md_import_device(dev, mddev->major_version,
mddev->minor_version);
else
rdev = md_import_device(dev, -1, -1);
if (IS_ERR(rdev)) { if (IS_ERR(rdev)) {
printk(KERN_WARNING printk(KERN_WARNING
"md: md_import_device returned %ld\n", "md: md_import_device returned %ld\n",