| /* |
| * Copyright (C) 2015, SUSE |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2, or (at your option) |
| * any later version. |
| * |
| */ |
| |
| |
| #include <linux/module.h> |
| #include <linux/dlm.h> |
| #include <linux/sched.h> |
| #include <linux/raid/md_p.h> |
| #include "md.h" |
| #include "bitmap.h" |
| #include "md-cluster.h" |
| |
| #define LVB_SIZE 64 |
| #define NEW_DEV_TIMEOUT 5000 |
| |
| struct dlm_lock_resource { |
| dlm_lockspace_t *ls; |
| struct dlm_lksb lksb; |
| char *name; /* lock name. */ |
| uint32_t flags; /* flags to pass to dlm_lock() */ |
| struct completion completion; /* completion for synchronized locking */ |
| void (*bast)(void *arg, int mode); /* blocking AST function pointer*/ |
| struct mddev *mddev; /* pointing back to mddev. */ |
| }; |
| |
| struct suspend_info { |
| int slot; |
| sector_t lo; |
| sector_t hi; |
| struct list_head list; |
| }; |
| |
| struct resync_info { |
| __le64 lo; |
| __le64 hi; |
| }; |
| |
| /* 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 { |
| /* dlm lock space and resources for clustered raid. */ |
| dlm_lockspace_t *lockspace; |
| int slot_number; |
| struct completion completion; |
| struct mutex sb_mutex; |
| struct dlm_lock_resource *bitmap_lockres; |
| struct list_head suspend_list; |
| spinlock_t suspend_lock; |
| struct md_thread *recovery_thread; |
| unsigned long recovery_map; |
| /* communication loc resources */ |
| struct dlm_lock_resource *ack_lockres; |
| struct dlm_lock_resource *message_lockres; |
| struct dlm_lock_resource *token_lockres; |
| struct dlm_lock_resource *no_new_dev_lockres; |
| struct md_thread *recv_thread; |
| struct completion newdisk_completion; |
| unsigned long state; |
| }; |
| |
| enum msg_type { |
| METADATA_UPDATED = 0, |
| RESYNCING, |
| NEWDISK, |
| REMOVE, |
| RE_ADD, |
| BITMAP_NEEDS_SYNC, |
| }; |
| |
| struct cluster_msg { |
| int type; |
| int slot; |
| /* TODO: Unionize this for smaller footprint */ |
| sector_t low; |
| sector_t high; |
| char uuid[16]; |
| int raid_slot; |
| }; |
| |
| static void sync_ast(void *arg) |
| { |
| struct dlm_lock_resource *res; |
| |
| res = (struct dlm_lock_resource *) arg; |
| complete(&res->completion); |
| } |
| |
| static int dlm_lock_sync(struct dlm_lock_resource *res, int mode) |
| { |
| int ret = 0; |
| |
| ret = dlm_lock(res->ls, mode, &res->lksb, |
| res->flags, res->name, strlen(res->name), |
| 0, sync_ast, res, res->bast); |
| if (ret) |
| return ret; |
| wait_for_completion(&res->completion); |
| return res->lksb.sb_status; |
| } |
| |
| static int dlm_unlock_sync(struct dlm_lock_resource *res) |
| { |
| return dlm_lock_sync(res, DLM_LOCK_NL); |
| } |
| |
| static struct dlm_lock_resource *lockres_init(struct mddev *mddev, |
| char *name, void (*bastfn)(void *arg, int mode), int with_lvb) |
| { |
| struct dlm_lock_resource *res = NULL; |
| int ret, namelen; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| 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); |
| res->name = kzalloc(namelen + 1, GFP_KERNEL); |
| if (!res->name) { |
| pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name); |
| goto out_err; |
| } |
| strlcpy(res->name, name, namelen + 1); |
| if (with_lvb) { |
| res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL); |
| if (!res->lksb.sb_lvbptr) { |
| pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name); |
| goto out_err; |
| } |
| res->flags = DLM_LKF_VALBLK; |
| } |
| |
| if (bastfn) |
| res->bast = bastfn; |
| |
| res->flags |= DLM_LKF_EXPEDITE; |
| |
| ret = dlm_lock_sync(res, DLM_LOCK_NL); |
| if (ret) { |
| pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name); |
| goto out_err; |
| } |
| res->flags &= ~DLM_LKF_EXPEDITE; |
| res->flags |= DLM_LKF_CONVERT; |
| |
| return res; |
| out_err: |
| kfree(res->lksb.sb_lvbptr); |
| kfree(res->name); |
| kfree(res); |
| return NULL; |
| } |
| |
| static void lockres_free(struct dlm_lock_resource *res) |
| { |
| int ret; |
| |
| if (!res) |
| return; |
| |
| /* 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); |
| kfree(res->lksb.sb_lvbptr); |
| kfree(res); |
| } |
| |
| static void add_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres, |
| sector_t lo, sector_t hi) |
| { |
| struct resync_info *ri; |
| |
| ri = (struct resync_info *)lockres->lksb.sb_lvbptr; |
| ri->lo = cpu_to_le64(lo); |
| ri->hi = cpu_to_le64(hi); |
| } |
| |
| static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres) |
| { |
| struct resync_info ri; |
| struct suspend_info *s = NULL; |
| sector_t hi = 0; |
| |
| dlm_lock_sync(lockres, DLM_LOCK_CR); |
| memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); |
| hi = le64_to_cpu(ri.hi); |
| if (ri.hi > 0) { |
| s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); |
| if (!s) |
| goto out; |
| s->hi = hi; |
| s->lo = le64_to_cpu(ri.lo); |
| } |
| dlm_unlock_sync(lockres); |
| out: |
| return s; |
| } |
| |
| static void recover_bitmaps(struct md_thread *thread) |
| { |
| struct mddev *mddev = thread->mddev; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| struct dlm_lock_resource *bm_lockres; |
| char str[64]; |
| int slot, ret; |
| struct suspend_info *s, *tmp; |
| sector_t lo, hi; |
| |
| while (cinfo->recovery_map) { |
| slot = fls64((u64)cinfo->recovery_map) - 1; |
| |
| /* Clear suspend_area associated with the bitmap */ |
| spin_lock_irq(&cinfo->suspend_lock); |
| list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) |
| if (slot == s->slot) { |
| list_del(&s->list); |
| kfree(s); |
| } |
| spin_unlock_irq(&cinfo->suspend_lock); |
| |
| snprintf(str, 64, "bitmap%04d", slot); |
| bm_lockres = lockres_init(mddev, str, NULL, 1); |
| if (!bm_lockres) { |
| pr_err("md-cluster: Cannot initialize bitmaps\n"); |
| goto clear_bit; |
| } |
| |
| ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); |
| if (ret) { |
| pr_err("md-cluster: Could not DLM lock %s: %d\n", |
| str, ret); |
| goto clear_bit; |
| } |
| ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true); |
| if (ret) { |
| pr_err("md-cluster: Could not copy data from bitmap %d\n", slot); |
| goto dlm_unlock; |
| } |
| if (hi > 0) { |
| /* TODO:Wait for current resync to get over */ |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| if (lo < mddev->recovery_cp) |
| mddev->recovery_cp = lo; |
| md_check_recovery(mddev); |
| } |
| dlm_unlock: |
| dlm_unlock_sync(bm_lockres); |
| clear_bit: |
| clear_bit(slot, &cinfo->recovery_map); |
| } |
| } |
| |
| 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(struct mddev *mddev, int slot) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| set_bit(slot, &cinfo->recovery_map); |
| if (!cinfo->recovery_thread) { |
| cinfo->recovery_thread = md_register_thread(recover_bitmaps, |
| mddev, "recover"); |
| if (!cinfo->recovery_thread) { |
| pr_warn("md-cluster: Could not create recovery thread\n"); |
| return; |
| } |
| } |
| 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) |
| { |
| struct mddev *mddev = arg; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| cinfo->slot_number = our_slot; |
| /* 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, |
| .recover_done = recover_done, |
| }; |
| |
| /* |
| * The BAST function for the ack lock resource |
| * This function wakes up the receive thread in |
| * order to receive and process the message. |
| */ |
| static void ack_bast(void *arg, int mode) |
| { |
| struct dlm_lock_resource *res = (struct dlm_lock_resource *)arg; |
| struct md_cluster_info *cinfo = res->mddev->cluster_info; |
| |
| if (mode == DLM_LOCK_EX) |
| md_wakeup_thread(cinfo->recv_thread); |
| } |
| |
| static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot) |
| { |
| struct suspend_info *s, *tmp; |
| |
| list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) |
| if (slot == s->slot) { |
| pr_info("%s:%d Deleting suspend_info: %d\n", |
| __func__, __LINE__, slot); |
| list_del(&s->list); |
| kfree(s); |
| break; |
| } |
| } |
| |
| static void remove_suspend_info(struct md_cluster_info *cinfo, int slot) |
| { |
| spin_lock_irq(&cinfo->suspend_lock); |
| __remove_suspend_info(cinfo, slot); |
| spin_unlock_irq(&cinfo->suspend_lock); |
| } |
| |
| |
| static void process_suspend_info(struct mddev *mddev, |
| int slot, sector_t lo, sector_t hi) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| struct suspend_info *s; |
| |
| if (!hi) { |
| remove_suspend_info(cinfo, slot); |
| return; |
| } |
| s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); |
| if (!s) |
| return; |
| s->slot = slot; |
| s->lo = lo; |
| s->hi = hi; |
| mddev->pers->quiesce(mddev, 1); |
| mddev->pers->quiesce(mddev, 0); |
| spin_lock_irq(&cinfo->suspend_lock); |
| /* Remove existing entry (if exists) before adding */ |
| __remove_suspend_info(cinfo, slot); |
| list_add(&s->list, &cinfo->suspend_list); |
| spin_unlock_irq(&cinfo->suspend_lock); |
| } |
| |
| static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg) |
| { |
| char disk_uuid[64]; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| char event_name[] = "EVENT=ADD_DEVICE"; |
| char raid_slot[16]; |
| char *envp[] = {event_name, disk_uuid, raid_slot, NULL}; |
| int len; |
| |
| len = snprintf(disk_uuid, 64, "DEVICE_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); |
| set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); |
| kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp); |
| wait_for_completion_timeout(&cinfo->newdisk_completion, |
| NEW_DEV_TIMEOUT); |
| clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); |
| } |
| |
| |
| static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| md_reload_sb(mddev); |
| 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_readd_disk(struct mddev *mddev, struct cluster_msg *msg) |
| { |
| struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot); |
| |
| if (rdev && test_bit(Faulty, &rdev->flags)) |
| clear_bit(Faulty, &rdev->flags); |
| else |
| pr_warn("%s: %d Could not find disk(%d) which is faulty", __func__, __LINE__, msg->raid_slot); |
| } |
| |
| static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) |
| { |
| switch (msg->type) { |
| case METADATA_UPDATED: |
| pr_info("%s: %d Received message: METADATA_UPDATE from %d\n", |
| __func__, __LINE__, msg->slot); |
| process_metadata_update(mddev, msg); |
| break; |
| case RESYNCING: |
| pr_info("%s: %d Received message: RESYNCING from %d\n", |
| __func__, __LINE__, msg->slot); |
| process_suspend_info(mddev, msg->slot, |
| msg->low, msg->high); |
| break; |
| case NEWDISK: |
| 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; |
| case RE_ADD: |
| pr_info("%s: %d Received RE_ADD from %d\n", |
| __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); |
| } |
| } |
| |
| /* |
| * thread for receiving message |
| */ |
| static void recv_daemon(struct md_thread *thread) |
| { |
| struct md_cluster_info *cinfo = thread->mddev->cluster_info; |
| 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)) { |
| pr_err("md/raid1:failed to get CR on MESSAGE\n"); |
| return; |
| } |
| |
| /* read lvb and wake up thread to process this message_lockres */ |
| memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg)); |
| process_recvd_msg(thread->mddev, &msg); |
| |
| /*release CR on ack_lockres*/ |
| 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*/ |
| 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*/ |
| ret = dlm_unlock_sync(message_lockres); |
| if (unlikely(ret != 0)) |
| pr_info("unlock msg failed return %d\n", ret); |
| } |
| |
| /* lock_comm() |
| * Takes the lock on the TOKEN lock resource so no other |
| * node can communicate while the operation is underway. |
| */ |
| static int lock_comm(struct md_cluster_info *cinfo) |
| { |
| int error; |
| |
| 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", |
| __func__, __LINE__, error); |
| return error; |
| } |
| |
| static void unlock_comm(struct md_cluster_info *cinfo) |
| { |
| dlm_unlock_sync(cinfo->token_lockres); |
| } |
| |
| /* __sendmsg() |
| * This function performs the actual sending of the message. This function is |
| * usually called after performing the encompassing operation |
| * The function: |
| * 1. Grabs the message lockresource in EX mode |
| * 2. Copies the message to the message LVB |
| * 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. |
| * 5. Downconvert ack lockresource to CR |
| */ |
| static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) |
| { |
| int error; |
| int slot = cinfo->slot_number - 1; |
| |
| cmsg->slot = cpu_to_le32(slot); |
| /*get EX on Message*/ |
| error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX); |
| if (error) { |
| pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error); |
| goto failed_message; |
| } |
| |
| memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg, |
| sizeof(struct cluster_msg)); |
| /*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 CW on MESSAGE(%d)\n", |
| error); |
| goto failed_ack; |
| } |
| |
| /*up-convert CR to EX on Ack*/ |
| error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX); |
| if (error) { |
| pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n", |
| error); |
| goto failed_ack; |
| } |
| |
| /*down-convert EX to CR on Ack*/ |
| error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR); |
| if (error) { |
| pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n", |
| error); |
| goto failed_ack; |
| } |
| |
| failed_ack: |
| 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; |
| } |
| |
| static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) |
| { |
| int ret; |
| |
| lock_comm(cinfo); |
| ret = __sendmsg(cinfo, cmsg); |
| unlock_comm(cinfo); |
| return ret; |
| } |
| |
| static int gather_all_resync_info(struct mddev *mddev, int total_slots) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| int i, ret = 0; |
| struct dlm_lock_resource *bm_lockres; |
| struct suspend_info *s; |
| char str[64]; |
| sector_t lo, hi; |
| |
| |
| for (i = 0; i < total_slots; i++) { |
| memset(str, '\0', 64); |
| snprintf(str, 64, "bitmap%04d", i); |
| bm_lockres = lockres_init(mddev, str, NULL, 1); |
| if (!bm_lockres) |
| return -ENOMEM; |
| if (i == (cinfo->slot_number - 1)) |
| continue; |
| |
| bm_lockres->flags |= DLM_LKF_NOQUEUE; |
| ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); |
| if (ret == -EAGAIN) { |
| memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE); |
| s = read_resync_info(mddev, bm_lockres); |
| if (s) { |
| pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n", |
| __func__, __LINE__, |
| (unsigned long long) s->lo, |
| (unsigned long long) s->hi, i); |
| spin_lock_irq(&cinfo->suspend_lock); |
| s->slot = i; |
| list_add(&s->list, &cinfo->suspend_list); |
| spin_unlock_irq(&cinfo->suspend_lock); |
| } |
| ret = 0; |
| lockres_free(bm_lockres); |
| continue; |
| } |
| if (ret) { |
| lockres_free(bm_lockres); |
| goto out; |
| } |
| |
| /* 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); |
| } |
| out: |
| return ret; |
| } |
| |
| static int join(struct mddev *mddev, int nodes) |
| { |
| struct md_cluster_info *cinfo; |
| int ret, ops_rv; |
| char str[64]; |
| |
| 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); |
| 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); |
| if (ret) |
| goto err; |
| wait_for_completion(&cinfo->completion); |
| if (nodes < cinfo->slot_number) { |
| pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).", |
| cinfo->slot_number, nodes); |
| ret = -ERANGE; |
| goto err; |
| } |
| /* Initiate the communication resources */ |
| ret = -ENOMEM; |
| cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv"); |
| if (!cinfo->recv_thread) { |
| pr_err("md-cluster: cannot allocate memory for recv_thread!\n"); |
| goto err; |
| } |
| cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1); |
| if (!cinfo->message_lockres) |
| goto err; |
| cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0); |
| if (!cinfo->token_lockres) |
| goto err; |
| cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0); |
| if (!cinfo->ack_lockres) |
| goto err; |
| cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0); |
| if (!cinfo->no_new_dev_lockres) |
| goto err; |
| |
| /* get sync CR lock on ACK. */ |
| if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR)) |
| pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n", |
| ret); |
| /* get sync CR lock on no-new-dev. */ |
| if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR)) |
| pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret); |
| |
| |
| pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number); |
| snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1); |
| cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1); |
| if (!cinfo->bitmap_lockres) |
| goto err; |
| if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) { |
| pr_err("Failed to get bitmap lock\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| ret = gather_all_resync_info(mddev, nodes); |
| if (ret) |
| goto err; |
| |
| return 0; |
| err: |
| lockres_free(cinfo->message_lockres); |
| lockres_free(cinfo->token_lockres); |
| lockres_free(cinfo->ack_lockres); |
| lockres_free(cinfo->no_new_dev_lockres); |
| lockres_free(cinfo->bitmap_lockres); |
| if (cinfo->lockspace) |
| dlm_release_lockspace(cinfo->lockspace, 2); |
| mddev->cluster_info = NULL; |
| kfree(cinfo); |
| return ret; |
| } |
| |
| static int leave(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| if (!cinfo) |
| return 0; |
| md_unregister_thread(&cinfo->recovery_thread); |
| md_unregister_thread(&cinfo->recv_thread); |
| lockres_free(cinfo->message_lockres); |
| lockres_free(cinfo->token_lockres); |
| lockres_free(cinfo->ack_lockres); |
| lockres_free(cinfo->no_new_dev_lockres); |
| lockres_free(cinfo->bitmap_lockres); |
| dlm_release_lockspace(cinfo->lockspace, 2); |
| return 0; |
| } |
| |
| /* slot_number(): Returns the MD slot number to use |
| * DLM starts the slot numbers from 1, wheras cluster-md |
| * wants the number to be from zero, so we deduct one |
| */ |
| static int slot_number(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| return cinfo->slot_number - 1; |
| } |
| |
| 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 int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| struct cluster_msg cmsg; |
| int slot = cinfo->slot_number - 1; |
| |
| add_resync_info(mddev, cinfo->bitmap_lockres, lo, hi); |
| /* Re-acquire the lock to refresh LVB */ |
| dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW); |
| pr_info("%s:%d lo: %llu hi: %llu\n", __func__, __LINE__, |
| (unsigned long long)lo, |
| (unsigned long long)hi); |
| cmsg.type = cpu_to_le32(RESYNCING); |
| cmsg.slot = cpu_to_le32(slot); |
| cmsg.low = cpu_to_le64(lo); |
| cmsg.high = cpu_to_le64(hi); |
| return sendmsg(cinfo, &cmsg); |
| } |
| |
| 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; |
| list_for_each_entry(s, &cinfo->suspend_list, list) |
| if (hi > s->lo && lo < s->hi) { |
| ret = 1; |
| break; |
| } |
| out: |
| spin_unlock_irq(&cinfo->suspend_lock); |
| return ret; |
| } |
| |
| static int add_new_disk_start(struct mddev *mddev, struct md_rdev *rdev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| struct cluster_msg cmsg; |
| int ret = 0; |
| struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
| char *uuid = sb->device_uuid; |
| |
| memset(&cmsg, 0, sizeof(cmsg)); |
| cmsg.type = cpu_to_le32(NEWDISK); |
| memcpy(cmsg.uuid, uuid, 16); |
| cmsg.raid_slot = rdev->desc_nr; |
| lock_comm(cinfo); |
| ret = __sendmsg(cinfo, &cmsg); |
| if (ret) |
| return ret; |
| cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE; |
| ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX); |
| cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE; |
| /* Some node does not "see" the device */ |
| if (ret == -EAGAIN) |
| ret = -ENOENT; |
| else |
| dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); |
| return ret; |
| } |
| |
| static int add_new_disk_finish(struct mddev *mddev) |
| { |
| struct cluster_msg cmsg; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| int ret; |
| /* Write sb and inform others */ |
| md_update_sb(mddev, 1); |
| cmsg.type = METADATA_UPDATED; |
| ret = __sendmsg(cinfo, &cmsg); |
| unlock_comm(cinfo); |
| return ret; |
| } |
| |
| static int new_disk_ack(struct mddev *mddev, bool ack) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) { |
| pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev)); |
| return -EINVAL; |
| } |
| |
| if (ack) |
| dlm_unlock_sync(cinfo->no_new_dev_lockres); |
| complete(&cinfo->newdisk_completion); |
| 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 int gather_bitmaps(struct md_rdev *rdev) |
| { |
| int sn, err; |
| sector_t lo, hi; |
| struct cluster_msg cmsg; |
| struct mddev *mddev = rdev->mddev; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| cmsg.type = RE_ADD; |
| cmsg.raid_slot = rdev->desc_nr; |
| err = sendmsg(cinfo, &cmsg); |
| if (err) |
| goto out; |
| |
| for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) { |
| if (sn == (cinfo->slot_number - 1)) |
| continue; |
| err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false); |
| if (err) { |
| pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn); |
| goto out; |
| } |
| if ((hi > 0) && (lo < mddev->recovery_cp)) |
| mddev->recovery_cp = lo; |
| } |
| out: |
| return err; |
| } |
| |
| 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, |
| .area_resyncing = area_resyncing, |
| .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, |
| .gather_bitmaps = gather_bitmaps, |
| }; |
| |
| static int __init cluster_init(void) |
| { |
| pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n"); |
| pr_info("Registering Cluster MD functions\n"); |
| register_md_cluster_operations(&cluster_ops, THIS_MODULE); |
| return 0; |
| } |
| |
| static void cluster_exit(void) |
| { |
| unregister_md_cluster_operations(); |
| } |
| |
| module_init(cluster_init); |
| module_exit(cluster_exit); |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Clustering support for MD"); |