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authorGoldwyn Rodrigues <rgoldwyn@suse.com>2014-10-29 18:51:31 -0500
committerGoldwyn Rodrigues <rgoldwyn@suse.com>2015-02-23 09:59:07 -0600
commit1aee41f637694d4bbf91c24195f2b63e3f6badd2 (patch)
treeb6f532e5a4265193dd5ebc547a0ab9f772143762 /drivers/md/raid1.c
parent7d49ffcfa3cc08aa2301bf3fdb1e423a3fd33ee7 (diff)
Add new disk to clustered array
Algorithm: 1. Node 1 issues mdadm --manage /dev/mdX --add /dev/sdYY which issues ioctl(ADD_NEW_DISC with disc.state set to MD_DISK_CLUSTER_ADD) 2. Node 1 sends NEWDISK with uuid and slot number 3. Other nodes issue kobject_uevent_env with uuid and slot number (Steps 4,5 could be a udev rule) 4. In userspace, the node searches for the disk, perhaps using blkid -t SUB_UUID="" 5. Other nodes issue either of the following depending on whether the disk was found: ioctl(ADD_NEW_DISK with disc.state set to MD_DISK_CANDIDATE and disc.number set to slot number) ioctl(CLUSTERED_DISK_NACK) 6. Other nodes drop lock on no-new-devs (CR) if device is found 7. Node 1 attempts EX lock on no-new-devs 8. If node 1 gets the lock, it sends METADATA_UPDATED after unmarking the disk as SpareLocal 9. If not (get no-new-dev lock), it fails the operation and sends METADATA_UPDATED 10. Other nodes understand if the device is added or not by reading the superblock again after receiving the METADATA_UPDATED message. Signed-off-by: Lidong Zhong <lzhong@suse.com> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Diffstat (limited to 'drivers/md/raid1.c')
-rw-r--r--drivers/md/raid1.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index f70d74189d16..53ed5d48308f 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1571,6 +1571,7 @@ static int raid1_spare_active(struct mddev *mddev)
struct md_rdev *rdev = conf->mirrors[i].rdev;
struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev;
if (repl
+ && !test_bit(Candidate, &repl->flags)
&& repl->recovery_offset == MaxSector
&& !test_bit(Faulty, &repl->flags)
&& !test_and_set_bit(In_sync, &repl->flags)) {