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authorGoldwyn Rodrigues <rgoldwyn@suse.com>2014-10-30 02:51:31 +0300
committerGoldwyn Rodrigues <rgoldwyn@suse.com>2015-02-23 18:59:07 +0300
commit1aee41f637694d4bbf91c24195f2b63e3f6badd2 (patch)
treeb6f532e5a4265193dd5ebc547a0ab9f772143762 /drivers/md/md-cluster.h
parent7d49ffcfa3cc08aa2301bf3fdb1e423a3fd33ee7 (diff)
downloadlinux-1aee41f637694d4bbf91c24195f2b63e3f6badd2.tar.xz
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.h4
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 */