From dbb64f8635f5d68192108b88759a34633a4bd558 Mon Sep 17 00:00:00 2001 From: Goldwyn Rodrigues Date: Thu, 1 Oct 2015 13:20:27 -0500 Subject: [PATCH] md-cluster: Fix adding of new disk with new reload code Adding the disk worked incorrectly with the new reload code. Fix it: - No operation should be performed on rdev marked as Candidate - After a metadata update operation, kick disk if role is 0xfffe else clear Candidate bit and continue with the regular change check. - Saving the mode of the lock resource to check if token lock is already locked, because it can be called twice while adding a disk. However, unlock_comm() must be called only once. - add_new_disk() is called by the node initiating the --add operation. If it needs to be canceled, call add_new_disk_cancel(). The operation is completed by md_update_sb() which will write and unlock the communication. Signed-off-by: Goldwyn Rodrigues --- drivers/md/md-cluster.c | 35 +++++++++++++++++++-------- drivers/md/md-cluster.h | 6 ++--- drivers/md/md.c | 52 ++++++++++++++++++++++++----------------- 3 files changed, 58 insertions(+), 35 deletions(-) diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c index e1ce9c9a0473..28494e9f8d02 100644 --- a/drivers/md/md-cluster.c +++ b/drivers/md/md-cluster.c @@ -28,6 +28,7 @@ struct dlm_lock_resource { struct completion completion; /* completion for synchronized locking */ void (*bast)(void *arg, int mode); /* blocking AST function pointer*/ struct mddev *mddev; /* pointing back to mddev. */ + int mode; }; struct suspend_info { @@ -107,6 +108,8 @@ static int dlm_lock_sync(struct dlm_lock_resource *res, int mode) if (ret) return ret; wait_for_completion(&res->completion); + if (res->lksb.sb_status == 0) + res->mode = mode; return res->lksb.sb_status; } @@ -128,6 +131,7 @@ static struct dlm_lock_resource *lockres_init(struct mddev *mddev, init_completion(&res->completion); res->ls = cinfo->lockspace; res->mddev = mddev; + res->mode = DLM_LOCK_IV; namelen = strlen(name); res->name = kzalloc(namelen + 1, GFP_KERNEL); if (!res->name) { @@ -536,11 +540,17 @@ static void recv_daemon(struct md_thread *thread) /* lock_comm() * Takes the lock on the TOKEN lock resource so no other * node can communicate while the operation is underway. + * If called again, and the TOKEN lock is alread in EX mode + * return success. However, care must be taken that unlock_comm() + * is called only once. */ static int lock_comm(struct md_cluster_info *cinfo) { int error; + if (cinfo->token_lockres->mode == DLM_LOCK_EX) + return 0; + error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); if (error) pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n", @@ -550,6 +560,7 @@ static int lock_comm(struct md_cluster_info *cinfo) static void unlock_comm(struct md_cluster_info *cinfo) { + WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX); dlm_unlock_sync(cinfo->token_lockres); } @@ -862,11 +873,10 @@ static int metadata_update_finish(struct mddev *mddev) return ret; } -static int metadata_update_cancel(struct mddev *mddev) +static void metadata_update_cancel(struct mddev *mddev) { struct md_cluster_info *cinfo = mddev->cluster_info; - - return dlm_unlock_sync(cinfo->token_lockres); + unlock_comm(cinfo); } static int resync_start(struct mddev *mddev) @@ -925,7 +935,11 @@ out: return ret; } -static int add_new_disk_start(struct mddev *mddev, struct md_rdev *rdev) +/* add_new_disk() - initiates a disk add + * However, if this fails before writing md_update_sb(), + * add_new_disk_cancel() must be called to release token lock + */ +static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev) { struct md_cluster_info *cinfo = mddev->cluster_info; struct cluster_msg cmsg; @@ -947,16 +961,17 @@ static int add_new_disk_start(struct mddev *mddev, struct md_rdev *rdev) /* Some node does not "see" the device */ if (ret == -EAGAIN) ret = -ENOENT; + if (ret) + unlock_comm(cinfo); else dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); return ret; } -static int add_new_disk_finish(struct mddev *mddev) +static void add_new_disk_cancel(struct mddev *mddev) { - /* Write sb and inform others */ - md_update_sb(mddev, 1); - return metadata_update_finish(mddev); + struct md_cluster_info *cinfo = mddev->cluster_info; + unlock_comm(cinfo); } static int new_disk_ack(struct mddev *mddev, bool ack) @@ -1023,8 +1038,8 @@ static struct md_cluster_operations cluster_ops = { .metadata_update_finish = metadata_update_finish, .metadata_update_cancel = metadata_update_cancel, .area_resyncing = area_resyncing, - .add_new_disk_start = add_new_disk_start, - .add_new_disk_finish = add_new_disk_finish, + .add_new_disk = add_new_disk, + .add_new_disk_cancel = add_new_disk_cancel, .new_disk_ack = new_disk_ack, .remove_disk = remove_disk, .gather_bitmaps = gather_bitmaps, diff --git a/drivers/md/md-cluster.h b/drivers/md/md-cluster.h index c94172673599..e75ea2613184 100644 --- a/drivers/md/md-cluster.h +++ b/drivers/md/md-cluster.h @@ -15,12 +15,12 @@ struct md_cluster_operations { int (*resync_info_update)(struct mddev *mddev, sector_t lo, sector_t hi); int (*metadata_update_start)(struct mddev *mddev); int (*metadata_update_finish)(struct mddev *mddev); - int (*metadata_update_cancel)(struct mddev *mddev); + void (*metadata_update_cancel)(struct mddev *mddev); int (*resync_start)(struct mddev *mddev); int (*resync_finish)(struct mddev *mddev); int (*area_resyncing)(struct mddev *mddev, int direction, sector_t lo, sector_t hi); - int (*add_new_disk_start)(struct mddev *mddev, struct md_rdev *rdev); - int (*add_new_disk_finish)(struct mddev *mddev); + int (*add_new_disk)(struct mddev *mddev, struct md_rdev *rdev); + void (*add_new_disk_cancel)(struct mddev *mddev); int (*new_disk_ack)(struct mddev *mddev, bool ack); int (*remove_disk)(struct mddev *mddev, struct md_rdev *rdev); int (*gather_bitmaps)(struct md_rdev *rdev); diff --git a/drivers/md/md.c b/drivers/md/md.c index 61e897def04f..8a6f67f55d3d 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -3246,14 +3246,6 @@ static void analyze_sbs(struct mddev *mddev) md_kick_rdev_from_array(rdev); continue; } - /* No device should have a Candidate flag - * when reading devices - */ - if (test_bit(Candidate, &rdev->flags)) { - pr_info("md: kicking Cluster Candidate %s from array!\n", - bdevname(rdev->bdev, b)); - md_kick_rdev_from_array(rdev); - } } if (mddev->level == LEVEL_MULTIPATH) { rdev->desc_nr = i++; @@ -5950,19 +5942,12 @@ static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) * check whether the device shows up in other nodes */ if (mddev_is_clustered(mddev)) { - if (info->state & (1 << MD_DISK_CANDIDATE)) { - /* Through --cluster-confirm */ + if (info->state & (1 << MD_DISK_CANDIDATE)) set_bit(Candidate, &rdev->flags); - err = md_cluster_ops->new_disk_ack(mddev, true); - if (err) { - export_rdev(rdev); - return err; - } - } else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { + else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { /* --add initiated by this node */ - err = md_cluster_ops->add_new_disk_start(mddev, rdev); + err = md_cluster_ops->add_new_disk(mddev, rdev); if (err) { - md_cluster_ops->add_new_disk_finish(mddev); export_rdev(rdev); return err; } @@ -5971,13 +5956,23 @@ static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) rdev->raid_disk = -1; err = bind_rdev_to_array(rdev, mddev); + if (err) export_rdev(rdev); - else + + if (mddev_is_clustered(mddev)) { + if (info->state & (1 << MD_DISK_CANDIDATE)) + md_cluster_ops->new_disk_ack(mddev, (err == 0)); + else { + if (err) + md_cluster_ops->add_new_disk_cancel(mddev); + else + err = add_bound_rdev(rdev); + } + + } else if (!err) err = add_bound_rdev(rdev); - if (mddev_is_clustered(mddev) && - (info->state & (1 << MD_DISK_CLUSTER_ADD))) - md_cluster_ops->add_new_disk_finish(mddev); + return err; } @@ -8055,6 +8050,8 @@ static int remove_and_add_spares(struct mddev *mddev, rdev_for_each(rdev, mddev) { if (this && this != rdev) continue; + if (test_bit(Candidate, &rdev->flags)) + continue; if (rdev->raid_disk >= 0 && !test_bit(In_sync, &rdev->flags) && !test_bit(Faulty, &rdev->flags)) @@ -8972,6 +8969,17 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) /* Check if the roles changed */ role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); + + if (test_bit(Candidate, &rdev2->flags)) { + if (role == 0xfffe) { + pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); + md_kick_rdev_from_array(rdev2); + continue; + } + else + clear_bit(Candidate, &rdev2->flags); + } + if (role != rdev2->raid_disk) { /* got activated */ if (rdev2->raid_disk == -1 && role != 0xffff) {