1aee41f637
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>
28 lines
875 B
C
28 lines
875 B
C
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#ifndef _MD_CLUSTER_H
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#define _MD_CLUSTER_H
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#include "md.h"
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struct mddev;
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struct md_rdev;
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struct md_cluster_operations {
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int (*join)(struct mddev *mddev, int nodes);
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int (*leave)(struct mddev *mddev);
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int (*slot_number)(struct mddev *mddev);
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void (*resync_info_update)(struct mddev *mddev, sector_t lo, sector_t hi);
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int (*resync_start)(struct mddev *mddev, sector_t lo, sector_t hi);
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void (*resync_finish)(struct mddev *mddev);
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int (*metadata_update_start)(struct mddev *mddev);
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int (*metadata_update_finish)(struct mddev *mddev);
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int (*metadata_update_cancel)(struct mddev *mddev);
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int (*area_resyncing)(struct mddev *mddev, sector_t lo, sector_t hi);
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int (*add_new_disk_start)(struct mddev *mddev, struct md_rdev *rdev);
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int (*add_new_disk_finish)(struct mddev *mddev);
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void (*new_disk_ack)(struct mddev *mddev, bool ack);
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};
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#endif /* _MD_CLUSTER_H */
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