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| author | Goldwyn Rodrigues <rgoldwyn@suse.com> | 2014-10-29 18:51:31 -0500 |
|---|---|---|
| committer | Goldwyn Rodrigues <rgoldwyn@suse.com> | 2015-02-23 09:59:07 -0600 |
| commit | 1aee41f637694d4bbf91c24195f2b63e3f6badd2 (patch) | |
| tree | b6f532e5a4265193dd5ebc547a0ab9f772143762 /drivers/md/md-cluster.h | |
| parent | 7d49ffcfa3cc08aa2301bf3fdb1e423a3fd33ee7 (diff) | |
| download | lwn-1aee41f637694d4bbf91c24195f2b63e3f6badd2.tar.gz lwn-1aee41f637694d4bbf91c24195f2b63e3f6badd2.zip | |
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/md-cluster.h')
| -rw-r--r-- | drivers/md/md-cluster.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/md/md-cluster.h b/drivers/md/md-cluster.h index 03785402afaa..60d7e58964f5 100644 --- a/drivers/md/md-cluster.h +++ b/drivers/md/md-cluster.h @@ -6,6 +6,7 @@ #include "md.h" struct mddev; +struct md_rdev; struct md_cluster_operations { int (*join)(struct mddev *mddev, int nodes); @@ -18,6 +19,9 @@ struct md_cluster_operations { int (*metadata_update_finish)(struct mddev *mddev); int (*metadata_update_cancel)(struct mddev *mddev); int (*area_resyncing)(struct mddev *mddev, sector_t lo, sector_t hi); + int (*add_new_disk_start)(struct mddev *mddev, struct md_rdev *rdev); + int (*add_new_disk_finish)(struct mddev *mddev); + void (*new_disk_ack)(struct mddev *mddev, bool ack); }; #endif /* _MD_CLUSTER_H */ |