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Support adding a spare to a live md array with external metadata.

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i.e. extend the 'md/dev-XXX/slot' attribute so that you can
tell a device to fill an vacant slot in an and md array.

Signed-off-by: Neil Brown <neilb@suse.de>
This commit is contained in:
Neil Brown
2008-06-28 08:31:31 +10:00
parent 8ed0a5216a
commit 6c2fce2ef6
5 changed files with 67 additions and 9 deletions
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10
drivers/md/raid5.c
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@@ -4607,21 +4607,27 @@ static int raid5_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
int found = 0;
int disk;
struct disk_info *p;
int first = 0;
int last = conf->raid_disks - 1;
if (mddev->degraded > conf->max_degraded)
/* no point adding a device */
return 0;
if (rdev->raid_disk >= 0)
first = last = rdev->raid_disk;
/*
* find the disk ... but prefer rdev->saved_raid_disk
* if possible.
*/
if (rdev->saved_raid_disk >= 0 &&
rdev->saved_raid_disk >= first &&
conf->disks[rdev->saved_raid_disk].rdev == NULL)
disk = rdev->saved_raid_disk;
else
disk = 0;
for ( ; disk < conf->raid_disks; disk++)
disk = first;
for ( ; disk <= last ; disk++)
if ((p=conf->disks + disk)->rdev == NULL) {
clear_bit(In_sync, &rdev->flags);
rdev->raid_disk = disk;