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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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42
drivers/md/md.c
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@@ -1932,7 +1932,7 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
slot = -1;
else if (e==buf || (*e && *e!= '\n'))
return -EINVAL;
if (rdev->mddev->pers) {
if (rdev->mddev->pers && slot == -1) {
/* Setting 'slot' on an active array requires also
* updating the 'rd%d' link, and communicating
* with the personality with ->hot_*_disk.
@@ -1940,8 +1940,6 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
* failed/spare devices. This normally happens automatically,
* but not when the metadata is externally managed.
*/
if (slot != -1)
return -EBUSY;
if (rdev->raid_disk == -1)
return -EEXIST;
/* personality does all needed checks */
@@ -1955,6 +1953,44 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
sysfs_remove_link(&rdev->mddev->kobj, nm);
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
} else if (rdev->mddev->pers) {
mdk_rdev_t *rdev2;
struct list_head *tmp;
/* Activating a spare .. or possibly reactivating
* if we every get bitmaps working here.
*/
if (rdev->raid_disk != -1)
return -EBUSY;
if (rdev->mddev->pers->hot_add_disk == NULL)
return -EINVAL;
rdev_for_each(rdev2, tmp, rdev->mddev)
if (rdev2->raid_disk == slot)
return -EEXIST;
rdev->raid_disk = slot;
if (test_bit(In_sync, &rdev->flags))
rdev->saved_raid_disk = slot;
else
rdev->saved_raid_disk = -1;
err = rdev->mddev->pers->
hot_add_disk(rdev->mddev, rdev);
if (err != 1) {
rdev->raid_disk = -1;
if (err == 0)
return -EEXIST;
return err;
}
sprintf(nm, "rd%d", rdev->raid_disk);
if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
printk(KERN_WARNING
"md: cannot register "
"%s for %s\n",
nm, mdname(rdev->mddev));
/* don't wakeup anyone, leave that to userspace. */
} else {
if (slot >= rdev->mddev->raid_disks)
return -ENOSPC;