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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.h | |
| parent | Read from the first device when an area is resyncing (diff) | |
| download | linux-dev-1aee41f637694d4bbf91c24195f2b63e3f6badd2.tar.xz linux-dev-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.h')
| -rw-r--r-- | drivers/md/md.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h index bfebcfdf54e6..6dc0ce09f50c 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -171,6 +171,10 @@ enum flag_bits { * a want_replacement device with same * raid_disk number. */ + Candidate, /* For clustered environments only: + * This device is seen locally but not + * by the whole cluster + */ }; #define BB_LEN_MASK (0x00000000000001FFULL) @@ -666,6 +670,7 @@ extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, extern void md_unplug(struct blk_plug_cb *cb, bool from_schedule); extern void md_reload_sb(struct mddev *mddev); +extern void md_update_sb(struct mddev *mddev, int force); static inline int mddev_check_plugged(struct mddev *mddev) { return !!blk_check_plugged(md_unplug, mddev, |