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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/md.h
parent7d49ffcfa3cc08aa2301bf3fdb1e423a3fd33ee7 (diff)
downloadop-kernel-dev-1aee41f637694d4bbf91c24195f2b63e3f6badd2.zip
op-kernel-dev-1aee41f637694d4bbf91c24195f2b63e3f6badd2.tar.gz
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.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h
index bfebcfd..6dc0ce0 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,
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