From 88bcfef7be513e8bf5448e0025330fdd97c4c708 Mon Sep 17 00:00:00 2001 From: Goldwyn Rodrigues Date: Tue, 14 Apr 2015 10:44:44 -0500 Subject: md-cluster: remove capabilities This adds "remove" capabilities for the clustered environment. When a user initiates removal of a device from the array, a REMOVE message with disk number in the array is sent to all the nodes which kick the respective device in their own array. This facilitates the removal of failed devices. Signed-off-by: Goldwyn Rodrigues Signed-off-by: NeilBrown --- drivers/md/md-cluster.c | 30 ++++++++++++++++++++++++++++++ drivers/md/md-cluster.h | 1 + drivers/md/md.c | 7 ++++++- 3 files changed, 37 insertions(+), 1 deletion(-) diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c index 10c44a3..30b41b7 100644 --- a/drivers/md/md-cluster.c +++ b/drivers/md/md-cluster.c @@ -72,6 +72,7 @@ enum msg_type { METADATA_UPDATED = 0, RESYNCING, NEWDISK, + REMOVE, }; struct cluster_msg { @@ -401,6 +402,16 @@ static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); } +static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg) +{ + struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot); + + if (rdev) + md_kick_rdev_from_array(rdev); + else + pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", __func__, __LINE__, msg->raid_slot); +} + static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) { switch (msg->type) { @@ -419,6 +430,15 @@ static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) pr_info("%s: %d Received message: NEWDISK from %d\n", __func__, __LINE__, msg->slot); process_add_new_disk(mddev, msg); + break; + case REMOVE: + pr_info("%s: %d Received REMOVE from %d\n", + __func__, __LINE__, msg->slot); + process_remove_disk(mddev, msg); + break; + default: + pr_warn("%s:%d Received unknown message from %d\n", + __func__, __LINE__, msg->slot); } } @@ -854,6 +874,15 @@ static int new_disk_ack(struct mddev *mddev, bool ack) return 0; } +static int remove_disk(struct mddev *mddev, struct md_rdev *rdev) +{ + struct cluster_msg cmsg; + struct md_cluster_info *cinfo = mddev->cluster_info; + cmsg.type = REMOVE; + cmsg.raid_slot = rdev->desc_nr; + return __sendmsg(cinfo, &cmsg); +} + static struct md_cluster_operations cluster_ops = { .join = join, .leave = leave, @@ -868,6 +897,7 @@ static struct md_cluster_operations cluster_ops = { .add_new_disk_start = add_new_disk_start, .add_new_disk_finish = add_new_disk_finish, .new_disk_ack = new_disk_ack, + .remove_disk = remove_disk, }; static int __init cluster_init(void) diff --git a/drivers/md/md-cluster.h b/drivers/md/md-cluster.h index 7417133..71e5143 100644 --- a/drivers/md/md-cluster.h +++ b/drivers/md/md-cluster.h @@ -22,6 +22,7 @@ struct md_cluster_operations { int (*add_new_disk_start)(struct mddev *mddev, struct md_rdev *rdev); int (*add_new_disk_finish)(struct mddev *mddev); int (*new_disk_ack)(struct mddev *mddev, bool ack); + int (*remove_disk)(struct mddev *mddev, struct md_rdev *rdev); }; #endif /* _MD_CLUSTER_H */ diff --git a/drivers/md/md.c b/drivers/md/md.c index d406a79..ca011d1 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -2477,8 +2477,10 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len) else { struct mddev *mddev = rdev->mddev; if (mddev_is_clustered(mddev)) - md_cluster_ops->metadata_update_start(mddev); + md_cluster_ops->remove_disk(mddev, rdev); md_kick_rdev_from_array(rdev); + if (mddev_is_clustered(mddev)) + md_cluster_ops->metadata_update_start(mddev); if (mddev->pers) md_update_sb(mddev, 1); md_new_event(mddev); @@ -5968,6 +5970,9 @@ static int hot_remove_disk(struct mddev *mddev, dev_t dev) if (rdev->raid_disk >= 0) goto busy; + if (mddev_is_clustered(mddev)) + md_cluster_ops->remove_disk(mddev, rdev); + md_kick_rdev_from_array(rdev); md_update_sb(mddev, 1); md_new_event(mddev); -- cgit v1.1