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metadata_update sends message to other nodes

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- request to send a message
   - make changes to superblock
   - send messages telling everyone that the superblock has changed
   - other nodes all read the superblock
   - other nodes all ack the messages
   - updating node release the "I'm sending a message" resource.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
This commit is contained in:
Goldwyn Rodrigues
2014-06-07 01:44:51 -05:00
parent 601b515c5d
commit 293467aa1f
3 changed files with 106 additions and 14 deletions
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28
drivers/md/md-cluster.c
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@@ -621,11 +621,39 @@ static void resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
}
static int metadata_update_start(struct mddev *mddev)
{
return lock_comm(mddev->cluster_info);
}
static int metadata_update_finish(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
struct cluster_msg cmsg;
int ret;
memset(&cmsg, 0, sizeof(cmsg));
cmsg.type = cpu_to_le32(METADATA_UPDATED);
ret = __sendmsg(cinfo, &cmsg);
unlock_comm(cinfo);
return ret;
}
static int metadata_update_cancel(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
return dlm_unlock_sync(cinfo->token_lockres);
}
static struct md_cluster_operations cluster_ops = {
.join = join,
.leave = leave,
.slot_number = slot_number,
.resync_info_update = resync_info_update,
.metadata_update_start = metadata_update_start,
.metadata_update_finish = metadata_update_finish,
.metadata_update_cancel = metadata_update_cancel,
};
static int __init cluster_init(void)