diff options
Diffstat (limited to 'drivers/md/md-cluster.c')
| -rw-r--r-- | drivers/md/md-cluster.c | 171 |
1 files changed, 116 insertions, 55 deletions
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c index fcfc4b9b2672..11e3bc9d2a4b 100644 --- a/drivers/md/md-cluster.c +++ b/drivers/md/md-cluster.c @@ -44,6 +44,8 @@ struct resync_info { /* md_cluster_info flags */ #define MD_CLUSTER_WAITING_FOR_NEWDISK 1 +#define MD_CLUSTER_SUSPEND_READ_BALANCING 2 +#define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3 struct md_cluster_info { @@ -51,7 +53,6 @@ struct md_cluster_info { dlm_lockspace_t *lockspace; int slot_number; struct completion completion; - struct dlm_lock_resource *sb_lock; struct mutex sb_mutex; struct dlm_lock_resource *bitmap_lockres; struct list_head suspend_list; @@ -74,6 +75,7 @@ enum msg_type { NEWDISK, REMOVE, RE_ADD, + BITMAP_NEEDS_SYNC, }; struct cluster_msg { @@ -98,7 +100,6 @@ static int dlm_lock_sync(struct dlm_lock_resource *res, int mode) { int ret = 0; - init_completion(&res->completion); ret = dlm_lock(res->ls, mode, &res->lksb, res->flags, res->name, strlen(res->name), 0, sync_ast, res, res->bast); @@ -123,6 +124,7 @@ static struct dlm_lock_resource *lockres_init(struct mddev *mddev, res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL); if (!res) return NULL; + init_completion(&res->completion); res->ls = cinfo->lockspace; res->mddev = mddev; namelen = strlen(name); @@ -164,11 +166,24 @@ out_err: static void lockres_free(struct dlm_lock_resource *res) { + int ret; + if (!res) return; - init_completion(&res->completion); - dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res); + /* cancel a lock request or a conversion request that is blocked */ + res->flags |= DLM_LKF_CANCEL; +retry: + ret = dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res); + if (unlikely(ret != 0)) { + pr_info("%s: failed to unlock %s return %d\n", __func__, res->name, ret); + + /* if a lock conversion is cancelled, then the lock is put + * back to grant queue, need to ensure it is unlocked */ + if (ret == -DLM_ECANCEL) + goto retry; + } + res->flags &= ~DLM_LKF_CANCEL; wait_for_completion(&res->completion); kfree(res->name); @@ -176,18 +191,6 @@ static void lockres_free(struct dlm_lock_resource *res) kfree(res); } -static char *pretty_uuid(char *dest, char *src) -{ - int i, len = 0; - - for (i = 0; i < 16; i++) { - if (i == 4 || i == 6 || i == 8 || i == 10) - len += sprintf(dest + len, "-"); - len += sprintf(dest + len, "%02x", (__u8)src[i]); - } - return dest; -} - static void add_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres, sector_t lo, sector_t hi) { @@ -275,18 +278,16 @@ clear_bit: static void recover_prep(void *arg) { + struct mddev *mddev = arg; + struct md_cluster_info *cinfo = mddev->cluster_info; + set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); } -static void recover_slot(void *arg, struct dlm_slot *slot) +static void __recover_slot(struct mddev *mddev, int slot) { - struct mddev *mddev = arg; struct md_cluster_info *cinfo = mddev->cluster_info; - pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n", - mddev->bitmap_info.cluster_name, - slot->nodeid, slot->slot, - cinfo->slot_number); - set_bit(slot->slot - 1, &cinfo->recovery_map); + set_bit(slot, &cinfo->recovery_map); if (!cinfo->recovery_thread) { cinfo->recovery_thread = md_register_thread(recover_bitmaps, mddev, "recover"); @@ -298,6 +299,20 @@ static void recover_slot(void *arg, struct dlm_slot *slot) md_wakeup_thread(cinfo->recovery_thread); } +static void recover_slot(void *arg, struct dlm_slot *slot) +{ + struct mddev *mddev = arg; + struct md_cluster_info *cinfo = mddev->cluster_info; + + pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n", + mddev->bitmap_info.cluster_name, + slot->nodeid, slot->slot, + cinfo->slot_number); + /* deduct one since dlm slot starts from one while the num of + * cluster-md begins with 0 */ + __recover_slot(mddev, slot->slot - 1); +} + static void recover_done(void *arg, struct dlm_slot *slots, int num_slots, int our_slot, uint32_t generation) @@ -306,9 +321,17 @@ static void recover_done(void *arg, struct dlm_slot *slots, struct md_cluster_info *cinfo = mddev->cluster_info; cinfo->slot_number = our_slot; - complete(&cinfo->completion); + /* completion is only need to be complete when node join cluster, + * it doesn't need to run during another node's failure */ + if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) { + complete(&cinfo->completion); + clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state); + } + clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); } +/* the ops is called when node join the cluster, and do lock recovery + * if node failure occurs */ static const struct dlm_lockspace_ops md_ls_ops = { .recover_prep = recover_prep, .recover_slot = recover_slot, @@ -383,7 +406,7 @@ static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg) int len; len = snprintf(disk_uuid, 64, "DEVICE_UUID="); - pretty_uuid(disk_uuid + len, cmsg->uuid); + sprintf(disk_uuid + len, "%pU", cmsg->uuid); snprintf(raid_slot, 16, "RAID_DISK=%d", cmsg->raid_slot); pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot); init_completion(&cinfo->newdisk_completion); @@ -452,6 +475,11 @@ static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) __func__, __LINE__, msg->slot); process_readd_disk(mddev, msg); break; + case BITMAP_NEEDS_SYNC: + pr_info("%s: %d Received BITMAP_NEEDS_SYNC from %d\n", + __func__, __LINE__, msg->slot); + __recover_slot(mddev, msg->slot); + break; default: pr_warn("%s:%d Received unknown message from %d\n", __func__, __LINE__, msg->slot); @@ -467,6 +495,7 @@ static void recv_daemon(struct md_thread *thread) struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres; struct dlm_lock_resource *message_lockres = cinfo->message_lockres; struct cluster_msg msg; + int ret; /*get CR on Message*/ if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) { @@ -479,13 +508,21 @@ static void recv_daemon(struct md_thread *thread) process_recvd_msg(thread->mddev, &msg); /*release CR on ack_lockres*/ - dlm_unlock_sync(ack_lockres); - /*up-convert to EX on message_lockres*/ - dlm_lock_sync(message_lockres, DLM_LOCK_EX); + ret = dlm_unlock_sync(ack_lockres); + if (unlikely(ret != 0)) + pr_info("unlock ack failed return %d\n", ret); + /*up-convert to PR on message_lockres*/ + ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR); + if (unlikely(ret != 0)) + pr_info("lock PR on msg failed return %d\n", ret); /*get CR on ack_lockres again*/ - dlm_lock_sync(ack_lockres, DLM_LOCK_CR); + ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR); + if (unlikely(ret != 0)) + pr_info("lock CR on ack failed return %d\n", ret); /*release CR on message_lockres*/ - dlm_unlock_sync(message_lockres); + ret = dlm_unlock_sync(message_lockres); + if (unlikely(ret != 0)) + pr_info("unlock msg failed return %d\n", ret); } /* lock_comm() @@ -514,7 +551,7 @@ static void unlock_comm(struct md_cluster_info *cinfo) * The function: * 1. Grabs the message lockresource in EX mode * 2. Copies the message to the message LVB - * 3. Downconverts message lockresource to CR + * 3. Downconverts message lockresource to CW * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes * and the other nodes read the message. The thread will wait here until all other * nodes have released ack lock resource. @@ -535,12 +572,12 @@ static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg, sizeof(struct cluster_msg)); - /*down-convert EX to CR on Message*/ - error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CR); + /*down-convert EX to CW on Message*/ + error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW); if (error) { - pr_err("md-cluster: failed to convert EX to CR on MESSAGE(%d)\n", + pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n", error); - goto failed_message; + goto failed_ack; } /*up-convert CR to EX on Ack*/ @@ -560,7 +597,13 @@ static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) } failed_ack: - dlm_unlock_sync(cinfo->message_lockres); + error = dlm_unlock_sync(cinfo->message_lockres); + if (unlikely(error != 0)) { + pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n", + error); + /* in case the message can't be released due to some reason */ + goto failed_ack; + } failed_message: return error; } @@ -582,6 +625,7 @@ static int gather_all_resync_info(struct mddev *mddev, int total_slots) struct dlm_lock_resource *bm_lockres; struct suspend_info *s; char str[64]; + sector_t lo, hi; for (i = 0; i < total_slots; i++) { @@ -612,9 +656,24 @@ static int gather_all_resync_info(struct mddev *mddev, int total_slots) lockres_free(bm_lockres); continue; } - if (ret) + if (ret) { + lockres_free(bm_lockres); goto out; - /* TODO: Read the disk bitmap sb and check if it needs recovery */ + } + + /* Read the disk bitmap sb and check if it needs recovery */ + ret = bitmap_copy_from_slot(mddev, i, &lo, &hi, false); + if (ret) { + pr_warn("md-cluster: Could not gather bitmaps from slot %d", i); + lockres_free(bm_lockres); + continue; + } + if ((hi > 0) && (lo < mddev->recovery_cp)) { + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + mddev->recovery_cp = lo; + md_check_recovery(mddev); + } + dlm_unlock_sync(bm_lockres); lockres_free(bm_lockres); } @@ -628,20 +687,20 @@ static int join(struct mddev *mddev, int nodes) int ret, ops_rv; char str[64]; - if (!try_module_get(THIS_MODULE)) - return -ENOENT; - cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL); if (!cinfo) return -ENOMEM; + INIT_LIST_HEAD(&cinfo->suspend_list); + spin_lock_init(&cinfo->suspend_lock); init_completion(&cinfo->completion); + set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state); mutex_init(&cinfo->sb_mutex); mddev->cluster_info = cinfo; memset(str, 0, 64); - pretty_uuid(str, mddev->uuid); + sprintf(str, "%pU", mddev->uuid); ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name, DLM_LSFL_FS, LVB_SIZE, &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace); @@ -654,12 +713,6 @@ static int join(struct mddev *mddev, int nodes) ret = -ERANGE; goto err; } - cinfo->sb_lock = lockres_init(mddev, "cmd-super", - NULL, 0); - if (!cinfo->sb_lock) { - ret = -ENOMEM; - goto err; - } /* Initiate the communication resources */ ret = -ENOMEM; cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv"); @@ -700,9 +753,6 @@ static int join(struct mddev *mddev, int nodes) goto err; } - INIT_LIST_HEAD(&cinfo->suspend_list); - spin_lock_init(&cinfo->suspend_lock); - ret = gather_all_resync_info(mddev, nodes); if (ret) goto err; @@ -714,12 +764,10 @@ err: lockres_free(cinfo->ack_lockres); lockres_free(cinfo->no_new_dev_lockres); lockres_free(cinfo->bitmap_lockres); - lockres_free(cinfo->sb_lock); if (cinfo->lockspace) dlm_release_lockspace(cinfo->lockspace, 2); mddev->cluster_info = NULL; kfree(cinfo); - module_put(THIS_MODULE); return ret; } @@ -735,7 +783,6 @@ static int leave(struct mddev *mddev) lockres_free(cinfo->token_lockres); lockres_free(cinfo->ack_lockres); lockres_free(cinfo->no_new_dev_lockres); - lockres_free(cinfo->sb_lock); lockres_free(cinfo->bitmap_lockres); dlm_release_lockspace(cinfo->lockspace, 2); return 0; @@ -812,16 +859,30 @@ static int resync_start(struct mddev *mddev, sector_t lo, sector_t hi) static void resync_finish(struct mddev *mddev) { + struct md_cluster_info *cinfo = mddev->cluster_info; + struct cluster_msg cmsg; + int slot = cinfo->slot_number - 1; + pr_info("%s:%d\n", __func__, __LINE__); resync_send(mddev, RESYNCING, 0, 0); + if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { + cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC); + cmsg.slot = cpu_to_le32(slot); + sendmsg(cinfo, &cmsg); + } } -static int area_resyncing(struct mddev *mddev, sector_t lo, sector_t hi) +static int area_resyncing(struct mddev *mddev, int direction, + sector_t lo, sector_t hi) { struct md_cluster_info *cinfo = mddev->cluster_info; int ret = 0; struct suspend_info *s; + if ((direction == READ) && + test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state)) + return 1; + spin_lock_irq(&cinfo->suspend_lock); if (list_empty(&cinfo->suspend_list)) goto out; |