| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (C) 2015, SUSE |
| */ |
| |
| |
| #include <linux/module.h> |
| #include <linux/kthread.h> |
| #include <linux/dlm.h> |
| #include <linux/sched.h> |
| #include <linux/raid/md_p.h> |
| #include "md.h" |
| #include "md-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() */ |
| wait_queue_head_t sync_locking; /* wait queue for synchronized locking */ |
| bool sync_locking_done; |
| void (*bast)(void *arg, int mode); /* blocking AST function pointer*/ |
| struct mddev *mddev; /* pointing back to mddev. */ |
| int mode; |
| }; |
| |
| 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 |
| |
| /* Lock the send communication. This is done through |
| * bit manipulation as opposed to a mutex in order to |
| * accomodate lock and hold. See next comment. |
| */ |
| #define MD_CLUSTER_SEND_LOCK 4 |
| /* If cluster operations (such as adding a disk) must lock the |
| * communication channel, so as to perform extra operations |
| * (update metadata) and no other operation is allowed on the |
| * MD. Token needs to be locked and held until the operation |
| * completes witha md_update_sb(), which would eventually release |
| * the lock. |
| */ |
| #define MD_CLUSTER_SEND_LOCKED_ALREADY 5 |
| /* We should receive message after node joined cluster and |
| * set up all the related infos such as bitmap and personality */ |
| #define MD_CLUSTER_ALREADY_IN_CLUSTER 6 |
| #define MD_CLUSTER_PENDING_RECV_EVENT 7 |
| #define MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD 8 |
| |
| struct md_cluster_info { |
| struct mddev *mddev; /* the md device which md_cluster_info belongs to */ |
| /* dlm lock space and resources for clustered raid. */ |
| dlm_lockspace_t *lockspace; |
| int slot_number; |
| struct completion completion; |
| struct mutex recv_mutex; |
| struct dlm_lock_resource *bitmap_lockres; |
| struct dlm_lock_resource **other_bitmap_lockres; |
| struct dlm_lock_resource *resync_lockres; |
| struct list_head suspend_list; |
| |
| spinlock_t suspend_lock; |
| /* record the region which write should be suspended */ |
| sector_t suspend_lo; |
| sector_t suspend_hi; |
| int suspend_from; /* the slot which broadcast suspend_lo/hi */ |
| |
| 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; |
| wait_queue_head_t wait; |
| unsigned long state; |
| /* record the region in RESYNCING message */ |
| sector_t sync_low; |
| sector_t sync_hi; |
| }; |
| |
| enum msg_type { |
| METADATA_UPDATED = 0, |
| RESYNCING, |
| NEWDISK, |
| REMOVE, |
| RE_ADD, |
| BITMAP_NEEDS_SYNC, |
| CHANGE_CAPACITY, |
| BITMAP_RESIZE, |
| }; |
| |
| struct cluster_msg { |
| __le32 type; |
| __le32 slot; |
| /* TODO: Unionize this for smaller footprint */ |
| __le64 low; |
| __le64 high; |
| char uuid[16]; |
| __le32 raid_slot; |
| }; |
| |
| static void sync_ast(void *arg) |
| { |
| struct dlm_lock_resource *res; |
| |
| res = arg; |
| res->sync_locking_done = true; |
| wake_up(&res->sync_locking); |
| } |
| |
| 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_event(res->sync_locking, res->sync_locking_done); |
| res->sync_locking_done = false; |
| if (res->lksb.sb_status == 0) |
| res->mode = mode; |
| return res->lksb.sb_status; |
| } |
| |
| static int dlm_unlock_sync(struct dlm_lock_resource *res) |
| { |
| return dlm_lock_sync(res, DLM_LOCK_NL); |
| } |
| |
| /* |
| * An variation of dlm_lock_sync, which make lock request could |
| * be interrupted |
| */ |
| static int dlm_lock_sync_interruptible(struct dlm_lock_resource *res, int mode, |
| struct mddev *mddev) |
| { |
| 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_event(res->sync_locking, res->sync_locking_done |
| || kthread_should_stop() |
| || test_bit(MD_CLOSING, &mddev->flags)); |
| if (!res->sync_locking_done) { |
| /* |
| * the convert queue contains the lock request when request is |
| * interrupted, and sync_ast could still be run, so need to |
| * cancel the request and reset completion |
| */ |
| ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_CANCEL, |
| &res->lksb, res); |
| res->sync_locking_done = false; |
| if (unlikely(ret != 0)) |
| pr_info("failed to cancel previous lock request " |
| "%s return %d\n", res->name, ret); |
| return -EPERM; |
| } else |
| res->sync_locking_done = false; |
| if (res->lksb.sb_status == 0) |
| res->mode = mode; |
| return res->lksb.sb_status; |
| } |
| |
| 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_waitqueue_head(&res->sync_locking); |
| res->sync_locking_done = false; |
| 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) { |
| pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name); |
| goto out_err; |
| } |
| strscpy(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 = 0; |
| |
| if (!res) |
| return; |
| |
| /* |
| * use FORCEUNLOCK flag, so we can unlock even the lock is on the |
| * waiting or convert queue |
| */ |
| ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_FORCEUNLOCK, |
| &res->lksb, res); |
| if (unlikely(ret != 0)) |
| pr_err("failed to unlock %s return %d\n", res->name, ret); |
| else |
| wait_event(res->sync_locking, res->sync_locking_done); |
| |
| kfree(res->name); |
| kfree(res->lksb.sb_lvbptr); |
| kfree(res); |
| } |
| |
| static void add_resync_info(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 int read_resync_info(struct mddev *mddev, |
| struct dlm_lock_resource *lockres) |
| { |
| struct resync_info ri; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| int ret = 0; |
| |
| dlm_lock_sync(lockres, DLM_LOCK_CR); |
| memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); |
| if (le64_to_cpu(ri.hi) > 0) { |
| cinfo->suspend_hi = le64_to_cpu(ri.hi); |
| cinfo->suspend_lo = le64_to_cpu(ri.lo); |
| ret = 1; |
| } |
| dlm_unlock_sync(lockres); |
| return ret; |
| } |
| |
| 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; |
| sector_t lo, hi; |
| |
| while (cinfo->recovery_map) { |
| slot = fls64((u64)cinfo->recovery_map) - 1; |
| |
| 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_interruptible(bm_lockres, DLM_LOCK_PW, mddev); |
| if (ret) { |
| pr_err("md-cluster: Could not DLM lock %s: %d\n", |
| str, ret); |
| goto clear_bit; |
| } |
| ret = md_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 clear_bit; |
| } |
| |
| /* Clear suspend_area associated with the bitmap */ |
| spin_lock_irq(&cinfo->suspend_lock); |
| cinfo->suspend_hi = 0; |
| cinfo->suspend_lo = 0; |
| cinfo->suspend_from = -1; |
| spin_unlock_irq(&cinfo->suspend_lock); |
| |
| /* Kick off a reshape if needed */ |
| if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) && |
| test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
| mddev->reshape_position != MaxSector) |
| md_wakeup_thread(mddev->sync_thread); |
| |
| if (hi > 0) { |
| if (lo < mddev->recovery_cp) |
| mddev->recovery_cp = lo; |
| /* wake up thread to continue resync in case resync |
| * is not finished */ |
| if (mddev->recovery_cp != MaxSector) { |
| /* |
| * clear the REMOTE flag since we will launch |
| * resync thread in current node. |
| */ |
| clear_bit(MD_RESYNCING_REMOTE, |
| &mddev->recovery); |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| } |
| } |
| clear_bit: |
| lockres_free(bm_lockres); |
| 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 = arg; |
| struct md_cluster_info *cinfo = res->mddev->cluster_info; |
| |
| if (mode == DLM_LOCK_EX) { |
| if (test_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state)) |
| md_wakeup_thread(cinfo->recv_thread); |
| else |
| set_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state); |
| } |
| } |
| |
| static void remove_suspend_info(struct mddev *mddev, int slot) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| mddev->pers->quiesce(mddev, 1); |
| spin_lock_irq(&cinfo->suspend_lock); |
| cinfo->suspend_hi = 0; |
| cinfo->suspend_lo = 0; |
| spin_unlock_irq(&cinfo->suspend_lock); |
| mddev->pers->quiesce(mddev, 0); |
| } |
| |
| 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 mdp_superblock_1 *sb = NULL; |
| struct md_rdev *rdev; |
| |
| if (!hi) { |
| /* |
| * clear the REMOTE flag since resync or recovery is finished |
| * in remote node. |
| */ |
| clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery); |
| remove_suspend_info(mddev, slot); |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| return; |
| } |
| |
| rdev_for_each(rdev, mddev) |
| if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) { |
| sb = page_address(rdev->sb_page); |
| break; |
| } |
| |
| /* |
| * The bitmaps are not same for different nodes |
| * if RESYNCING is happening in one node, then |
| * the node which received the RESYNCING message |
| * probably will perform resync with the region |
| * [lo, hi] again, so we could reduce resync time |
| * a lot if we can ensure that the bitmaps among |
| * different nodes are match up well. |
| * |
| * sync_low/hi is used to record the region which |
| * arrived in the previous RESYNCING message, |
| * |
| * Call md_bitmap_sync_with_cluster to clear NEEDED_MASK |
| * and set RESYNC_MASK since resync thread is running |
| * in another node, so we don't need to do the resync |
| * again with the same section. |
| * |
| * Skip md_bitmap_sync_with_cluster in case reshape |
| * happening, because reshaping region is small and |
| * we don't want to trigger lots of WARN. |
| */ |
| if (sb && !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) |
| md_bitmap_sync_with_cluster(mddev, cinfo->sync_low, |
| cinfo->sync_hi, lo, hi); |
| cinfo->sync_low = lo; |
| cinfo->sync_hi = hi; |
| |
| mddev->pers->quiesce(mddev, 1); |
| spin_lock_irq(&cinfo->suspend_lock); |
| cinfo->suspend_from = slot; |
| cinfo->suspend_lo = lo; |
| cinfo->suspend_hi = hi; |
| spin_unlock_irq(&cinfo->suspend_lock); |
| mddev->pers->quiesce(mddev, 0); |
| } |
| |
| 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", le32_to_cpu(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) |
| { |
| int got_lock = 0; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| mddev->good_device_nr = le32_to_cpu(msg->raid_slot); |
| |
| dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); |
| wait_event(mddev->thread->wqueue, |
| (got_lock = mddev_trylock(mddev)) || |
| test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state)); |
| md_reload_sb(mddev, mddev->good_device_nr); |
| if (got_lock) |
| mddev_unlock(mddev); |
| } |
| |
| static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg) |
| { |
| struct md_rdev *rdev; |
| |
| rcu_read_lock(); |
| rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot)); |
| if (rdev) { |
| set_bit(ClusterRemove, &rdev->flags); |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| } |
| else |
| pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", |
| __func__, __LINE__, le32_to_cpu(msg->raid_slot)); |
| rcu_read_unlock(); |
| } |
| |
| static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg) |
| { |
| struct md_rdev *rdev; |
| |
| rcu_read_lock(); |
| rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(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__, le32_to_cpu(msg->raid_slot)); |
| rcu_read_unlock(); |
| } |
| |
| static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) |
| { |
| int ret = 0; |
| |
| if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot), |
| "node %d received its own msg\n", le32_to_cpu(msg->slot))) |
| return -1; |
| switch (le32_to_cpu(msg->type)) { |
| case METADATA_UPDATED: |
| process_metadata_update(mddev, msg); |
| break; |
| case CHANGE_CAPACITY: |
| set_capacity_and_notify(mddev->gendisk, mddev->array_sectors); |
| break; |
| case RESYNCING: |
| set_bit(MD_RESYNCING_REMOTE, &mddev->recovery); |
| process_suspend_info(mddev, le32_to_cpu(msg->slot), |
| le64_to_cpu(msg->low), |
| le64_to_cpu(msg->high)); |
| break; |
| case NEWDISK: |
| process_add_new_disk(mddev, msg); |
| break; |
| case REMOVE: |
| process_remove_disk(mddev, msg); |
| break; |
| case RE_ADD: |
| process_readd_disk(mddev, msg); |
| break; |
| case BITMAP_NEEDS_SYNC: |
| __recover_slot(mddev, le32_to_cpu(msg->slot)); |
| break; |
| case BITMAP_RESIZE: |
| if (le64_to_cpu(msg->high) != mddev->pers->size(mddev, 0, 0)) |
| ret = md_bitmap_resize(mddev->bitmap, |
| le64_to_cpu(msg->high), 0, 0); |
| break; |
| default: |
| ret = -1; |
| pr_warn("%s:%d Received unknown message from %d\n", |
| __func__, __LINE__, msg->slot); |
| } |
| return ret; |
| } |
| |
| /* |
| * 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; |
| |
| mutex_lock(&cinfo->recv_mutex); |
| /*get CR on Message*/ |
| if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) { |
| pr_err("md/raid1:failed to get CR on MESSAGE\n"); |
| mutex_unlock(&cinfo->recv_mutex); |
| return; |
| } |
| |
| /* read lvb and wake up thread to process this message_lockres */ |
| memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg)); |
| ret = process_recvd_msg(thread->mddev, &msg); |
| if (ret) |
| goto out; |
| |
| /*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); |
| out: |
| /*release CR on message_lockres*/ |
| ret = dlm_unlock_sync(message_lockres); |
| if (unlikely(ret != 0)) |
| pr_info("unlock msg failed return %d\n", ret); |
| mutex_unlock(&cinfo->recv_mutex); |
| } |
| |
| /* lock_token() |
| * Takes the lock on the TOKEN lock resource so no other |
| * node can communicate while the operation is underway. |
| */ |
| static int lock_token(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); |
| } else { |
| /* Lock the receive sequence */ |
| mutex_lock(&cinfo->recv_mutex); |
| } |
| return error; |
| } |
| |
| /* lock_comm() |
| * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel. |
| */ |
| static int lock_comm(struct md_cluster_info *cinfo, bool mddev_locked) |
| { |
| int rv, set_bit = 0; |
| struct mddev *mddev = cinfo->mddev; |
| |
| /* |
| * If resync thread run after raid1d thread, then process_metadata_update |
| * could not continue if raid1d held reconfig_mutex (and raid1d is blocked |
| * since another node already got EX on Token and waitting the EX of Ack), |
| * so let resync wake up thread in case flag is set. |
| */ |
| if (mddev_locked && !test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, |
| &cinfo->state)) { |
| rv = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, |
| &cinfo->state); |
| WARN_ON_ONCE(rv); |
| md_wakeup_thread(mddev->thread); |
| set_bit = 1; |
| } |
| |
| wait_event(cinfo->wait, |
| !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state)); |
| rv = lock_token(cinfo); |
| if (set_bit) |
| clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
| return rv; |
| } |
| |
| static void unlock_comm(struct md_cluster_info *cinfo) |
| { |
| WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX); |
| mutex_unlock(&cinfo->recv_mutex); |
| dlm_unlock_sync(cinfo->token_lockres); |
| clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state); |
| wake_up(&cinfo->wait); |
| } |
| |
| /* __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, |
| bool mddev_locked) |
| { |
| int ret; |
| |
| ret = lock_comm(cinfo, mddev_locked); |
| if (!ret) { |
| 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; |
| 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)) { |
| lockres_free(bm_lockres); |
| continue; |
| } |
| |
| bm_lockres->flags |= DLM_LKF_NOQUEUE; |
| ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); |
| if (ret == -EAGAIN) { |
| if (read_resync_info(mddev, bm_lockres)) { |
| pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n", |
| __func__, __LINE__, |
| (unsigned long long) cinfo->suspend_lo, |
| (unsigned long long) cinfo->suspend_hi, |
| i); |
| cinfo->suspend_from = i; |
| } |
| 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 = md_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); |
| } |
| |
| 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); |
| init_waitqueue_head(&cinfo->wait); |
| mutex_init(&cinfo->recv_mutex); |
| |
| mddev->cluster_info = cinfo; |
| cinfo->mddev = mddev; |
| |
| 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->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0); |
| if (!cinfo->no_new_dev_lockres) |
| goto err; |
| |
| ret = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); |
| if (ret) { |
| ret = -EAGAIN; |
| pr_err("md-cluster: can't join cluster to avoid lock issue\n"); |
| goto err; |
| } |
| cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0); |
| if (!cinfo->ack_lockres) { |
| ret = -ENOMEM; |
| 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); |
| dlm_unlock_sync(cinfo->token_lockres); |
| /* 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) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) { |
| pr_err("Failed to get bitmap lock\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0); |
| if (!cinfo->resync_lockres) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| return 0; |
| err: |
| set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
| 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->resync_lockres); |
| lockres_free(cinfo->bitmap_lockres); |
| if (cinfo->lockspace) |
| dlm_release_lockspace(cinfo->lockspace, 2); |
| mddev->cluster_info = NULL; |
| kfree(cinfo); |
| return ret; |
| } |
| |
| static void load_bitmaps(struct mddev *mddev, int total_slots) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| /* load all the node's bitmap info for resync */ |
| if (gather_all_resync_info(mddev, total_slots)) |
| pr_err("md-cluster: failed to gather all resyn infos\n"); |
| set_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state); |
| /* wake up recv thread in case something need to be handled */ |
| if (test_and_clear_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state)) |
| md_wakeup_thread(cinfo->recv_thread); |
| } |
| |
| static void resync_bitmap(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| struct cluster_msg cmsg = {0}; |
| int err; |
| |
| cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC); |
| err = sendmsg(cinfo, &cmsg, 1); |
| if (err) |
| pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n", |
| __func__, __LINE__, err); |
| } |
| |
| static void unlock_all_bitmaps(struct mddev *mddev); |
| static int leave(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| if (!cinfo) |
| return 0; |
| |
| /* |
| * BITMAP_NEEDS_SYNC message should be sent when node |
| * is leaving the cluster with dirty bitmap, also we |
| * can only deliver it when dlm connection is available. |
| * |
| * Also, we should send BITMAP_NEEDS_SYNC message in |
| * case reshaping is interrupted. |
| */ |
| if ((cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector) || |
| (mddev->reshape_position != MaxSector && |
| test_bit(MD_CLOSING, &mddev->flags))) |
| resync_bitmap(mddev); |
| |
| set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
| 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->resync_lockres); |
| lockres_free(cinfo->bitmap_lockres); |
| unlock_all_bitmaps(mddev); |
| dlm_release_lockspace(cinfo->lockspace, 2); |
| kfree(cinfo); |
| 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; |
| } |
| |
| /* |
| * Check if the communication is already locked, else lock the communication |
| * channel. |
| * If it is already locked, token is in EX mode, and hence lock_token() |
| * should not be called. |
| */ |
| static int metadata_update_start(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| int ret; |
| |
| /* |
| * metadata_update_start is always called with the protection of |
| * reconfig_mutex, so set WAITING_FOR_TOKEN here. |
| */ |
| ret = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, |
| &cinfo->state); |
| WARN_ON_ONCE(ret); |
| md_wakeup_thread(mddev->thread); |
| |
| wait_event(cinfo->wait, |
| !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) || |
| test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state)); |
| |
| /* If token is already locked, return 0 */ |
| if (cinfo->token_lockres->mode == DLM_LOCK_EX) { |
| clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
| return 0; |
| } |
| |
| ret = lock_token(cinfo); |
| clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
| return ret; |
| } |
| |
| static int metadata_update_finish(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| struct cluster_msg cmsg; |
| struct md_rdev *rdev; |
| int ret = 0; |
| int raid_slot = -1; |
| |
| memset(&cmsg, 0, sizeof(cmsg)); |
| cmsg.type = cpu_to_le32(METADATA_UPDATED); |
| /* Pick up a good active device number to send. |
| */ |
| rdev_for_each(rdev, mddev) |
| if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) { |
| raid_slot = rdev->desc_nr; |
| break; |
| } |
| if (raid_slot >= 0) { |
| cmsg.raid_slot = cpu_to_le32(raid_slot); |
| ret = __sendmsg(cinfo, &cmsg); |
| } else |
| pr_warn("md-cluster: No good device id found to send\n"); |
| clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
| unlock_comm(cinfo); |
| return ret; |
| } |
| |
| static void metadata_update_cancel(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
| unlock_comm(cinfo); |
| } |
| |
| static int update_bitmap_size(struct mddev *mddev, sector_t size) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| struct cluster_msg cmsg = {0}; |
| int ret; |
| |
| cmsg.type = cpu_to_le32(BITMAP_RESIZE); |
| cmsg.high = cpu_to_le64(size); |
| ret = sendmsg(cinfo, &cmsg, 0); |
| if (ret) |
| pr_err("%s:%d: failed to send BITMAP_RESIZE message (%d)\n", |
| __func__, __LINE__, ret); |
| return ret; |
| } |
| |
| static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsize) |
| { |
| struct bitmap_counts *counts; |
| char str[64]; |
| struct dlm_lock_resource *bm_lockres; |
| struct bitmap *bitmap = mddev->bitmap; |
| unsigned long my_pages = bitmap->counts.pages; |
| int i, rv; |
| |
| /* |
| * We need to ensure all the nodes can grow to a larger |
| * bitmap size before make the reshaping. |
| */ |
| rv = update_bitmap_size(mddev, newsize); |
| if (rv) |
| return rv; |
| |
| for (i = 0; i < mddev->bitmap_info.nodes; i++) { |
| if (i == md_cluster_ops->slot_number(mddev)) |
| continue; |
| |
| bitmap = get_bitmap_from_slot(mddev, i); |
| if (IS_ERR(bitmap)) { |
| pr_err("can't get bitmap from slot %d\n", i); |
| bitmap = NULL; |
| goto out; |
| } |
| counts = &bitmap->counts; |
| |
| /* |
| * If we can hold the bitmap lock of one node then |
| * the slot is not occupied, update the pages. |
| */ |
| snprintf(str, 64, "bitmap%04d", i); |
| bm_lockres = lockres_init(mddev, str, NULL, 1); |
| if (!bm_lockres) { |
| pr_err("Cannot initialize %s lock\n", str); |
| goto out; |
| } |
| bm_lockres->flags |= DLM_LKF_NOQUEUE; |
| rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); |
| if (!rv) |
| counts->pages = my_pages; |
| lockres_free(bm_lockres); |
| |
| if (my_pages != counts->pages) |
| /* |
| * Let's revert the bitmap size if one node |
| * can't resize bitmap |
| */ |
| goto out; |
| md_bitmap_free(bitmap); |
| } |
| |
| return 0; |
| out: |
| md_bitmap_free(bitmap); |
| update_bitmap_size(mddev, oldsize); |
| return -1; |
| } |
| |
| /* |
| * return 0 if all the bitmaps have the same sync_size |
| */ |
| static int cluster_check_sync_size(struct mddev *mddev) |
| { |
| int i, rv; |
| bitmap_super_t *sb; |
| unsigned long my_sync_size, sync_size = 0; |
| int node_num = mddev->bitmap_info.nodes; |
| int current_slot = md_cluster_ops->slot_number(mddev); |
| struct bitmap *bitmap = mddev->bitmap; |
| char str[64]; |
| struct dlm_lock_resource *bm_lockres; |
| |
| sb = kmap_atomic(bitmap->storage.sb_page); |
| my_sync_size = sb->sync_size; |
| kunmap_atomic(sb); |
| |
| for (i = 0; i < node_num; i++) { |
| if (i == current_slot) |
| continue; |
| |
| bitmap = get_bitmap_from_slot(mddev, i); |
| if (IS_ERR(bitmap)) { |
| pr_err("can't get bitmap from slot %d\n", i); |
| return -1; |
| } |
| |
| /* |
| * If we can hold the bitmap lock of one node then |
| * the slot is not occupied, update the sb. |
| */ |
| snprintf(str, 64, "bitmap%04d", i); |
| bm_lockres = lockres_init(mddev, str, NULL, 1); |
| if (!bm_lockres) { |
| pr_err("md-cluster: Cannot initialize %s\n", str); |
| md_bitmap_free(bitmap); |
| return -1; |
| } |
| bm_lockres->flags |= DLM_LKF_NOQUEUE; |
| rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); |
| if (!rv) |
| md_bitmap_update_sb(bitmap); |
| lockres_free(bm_lockres); |
| |
| sb = kmap_atomic(bitmap->storage.sb_page); |
| if (sync_size == 0) |
| sync_size = sb->sync_size; |
| else if (sync_size != sb->sync_size) { |
| kunmap_atomic(sb); |
| md_bitmap_free(bitmap); |
| return -1; |
| } |
| kunmap_atomic(sb); |
| md_bitmap_free(bitmap); |
| } |
| |
| return (my_sync_size == sync_size) ? 0 : -1; |
| } |
| |
| /* |
| * Update the size for cluster raid is a little more complex, we perform it |
| * by the steps: |
| * 1. hold token lock and update superblock in initiator node. |
| * 2. send METADATA_UPDATED msg to other nodes. |
| * 3. The initiator node continues to check each bitmap's sync_size, if all |
| * bitmaps have the same value of sync_size, then we can set capacity and |
| * let other nodes to perform it. If one node can't update sync_size |
| * accordingly, we need to revert to previous value. |
| */ |
| static void update_size(struct mddev *mddev, sector_t old_dev_sectors) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| struct cluster_msg cmsg; |
| struct md_rdev *rdev; |
| int ret = 0; |
| int raid_slot = -1; |
| |
| md_update_sb(mddev, 1); |
| if (lock_comm(cinfo, 1)) { |
| pr_err("%s: lock_comm failed\n", __func__); |
| return; |
| } |
| |
| memset(&cmsg, 0, sizeof(cmsg)); |
| cmsg.type = cpu_to_le32(METADATA_UPDATED); |
| rdev_for_each(rdev, mddev) |
| if (rdev->raid_disk >= 0 && !test_bit(Faulty, &rdev->flags)) { |
| raid_slot = rdev->desc_nr; |
| break; |
| } |
| if (raid_slot >= 0) { |
| cmsg.raid_slot = cpu_to_le32(raid_slot); |
| /* |
| * We can only change capiticy after all the nodes can do it, |
| * so need to wait after other nodes already received the msg |
| * and handled the change |
| */ |
| ret = __sendmsg(cinfo, &cmsg); |
| if (ret) { |
| pr_err("%s:%d: failed to send METADATA_UPDATED msg\n", |
| __func__, __LINE__); |
| unlock_comm(cinfo); |
| return; |
| } |
| } else { |
| pr_err("md-cluster: No good device id found to send\n"); |
| unlock_comm(cinfo); |
| return; |
| } |
| |
| /* |
| * check the sync_size from other node's bitmap, if sync_size |
| * have already updated in other nodes as expected, send an |
| * empty metadata msg to permit the change of capacity |
| */ |
| if (cluster_check_sync_size(mddev) == 0) { |
| memset(&cmsg, 0, sizeof(cmsg)); |
| cmsg.type = cpu_to_le32(CHANGE_CAPACITY); |
| ret = __sendmsg(cinfo, &cmsg); |
| if (ret) |
| pr_err("%s:%d: failed to send CHANGE_CAPACITY msg\n", |
| __func__, __LINE__); |
| set_capacity_and_notify(mddev->gendisk, mddev->array_sectors); |
| } else { |
| /* revert to previous sectors */ |
| ret = mddev->pers->resize(mddev, old_dev_sectors); |
| ret = __sendmsg(cinfo, &cmsg); |
| if (ret) |
| pr_err("%s:%d: failed to send METADATA_UPDATED msg\n", |
| __func__, __LINE__); |
| } |
| unlock_comm(cinfo); |
| } |
| |
| static int resync_start(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| return dlm_lock_sync_interruptible(cinfo->resync_lockres, DLM_LOCK_EX, mddev); |
| } |
| |
| static void resync_info_get(struct mddev *mddev, sector_t *lo, sector_t *hi) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| spin_lock_irq(&cinfo->suspend_lock); |
| *lo = cinfo->suspend_lo; |
| *hi = cinfo->suspend_hi; |
| spin_unlock_irq(&cinfo->suspend_lock); |
| } |
| |
| static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| struct resync_info ri; |
| struct cluster_msg cmsg = {0}; |
| |
| /* do not send zero again, if we have sent before */ |
| if (hi == 0) { |
| memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); |
| if (le64_to_cpu(ri.hi) == 0) |
| return 0; |
| } |
| |
| add_resync_info(cinfo->bitmap_lockres, lo, hi); |
| /* Re-acquire the lock to refresh LVB */ |
| dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW); |
| cmsg.type = cpu_to_le32(RESYNCING); |
| cmsg.low = cpu_to_le64(lo); |
| cmsg.high = cpu_to_le64(hi); |
| |
| /* |
| * mddev_lock is held if resync_info_update is called from |
| * resync_finish (md_reap_sync_thread -> resync_finish) |
| */ |
| if (lo == 0 && hi == 0) |
| return sendmsg(cinfo, &cmsg, 1); |
| else |
| return sendmsg(cinfo, &cmsg, 0); |
| } |
| |
| static int resync_finish(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| int ret = 0; |
| |
| clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery); |
| |
| /* |
| * If resync thread is interrupted so we can't say resync is finished, |
| * another node will launch resync thread to continue. |
| */ |
| if (!test_bit(MD_CLOSING, &mddev->flags)) |
| ret = resync_info_update(mddev, 0, 0); |
| dlm_unlock_sync(cinfo->resync_lockres); |
| return ret; |
| } |
| |
| 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; |
| |
| if ((direction == READ) && |
| test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state)) |
| return 1; |
| |
| spin_lock_irq(&cinfo->suspend_lock); |
| if (hi > cinfo->suspend_lo && lo < cinfo->suspend_hi) |
| ret = 1; |
| spin_unlock_irq(&cinfo->suspend_lock); |
| return ret; |
| } |
| |
| /* 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; |
| 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 = cpu_to_le32(rdev->desc_nr); |
| if (lock_comm(cinfo, 1)) |
| return -EAGAIN; |
| ret = __sendmsg(cinfo, &cmsg); |
| if (ret) { |
| unlock_comm(cinfo); |
| 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; |
| if (ret) |
| unlock_comm(cinfo); |
| else { |
| dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); |
| /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which |
| * will run soon after add_new_disk, the below path will be |
| * invoked: |
| * md_wakeup_thread(mddev->thread) |
| * -> conf->thread (raid1d) |
| * -> md_check_recovery -> md_update_sb |
| * -> metadata_update_start/finish |
| * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually. |
| * |
| * For other failure cases, metadata_update_cancel and |
| * add_new_disk_cancel also clear below bit as well. |
| * */ |
| set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
| wake_up(&cinfo->wait); |
| } |
| return ret; |
| } |
| |
| static void add_new_disk_cancel(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
| unlock_comm(cinfo); |
| } |
| |
| 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 = {0}; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| cmsg.type = cpu_to_le32(REMOVE); |
| cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); |
| return sendmsg(cinfo, &cmsg, 1); |
| } |
| |
| static int lock_all_bitmaps(struct mddev *mddev) |
| { |
| int slot, my_slot, ret, held = 1, i = 0; |
| char str[64]; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| cinfo->other_bitmap_lockres = |
| kcalloc(mddev->bitmap_info.nodes - 1, |
| sizeof(struct dlm_lock_resource *), GFP_KERNEL); |
| if (!cinfo->other_bitmap_lockres) { |
| pr_err("md: can't alloc mem for other bitmap locks\n"); |
| return 0; |
| } |
| |
| my_slot = slot_number(mddev); |
| for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) { |
| if (slot == my_slot) |
| continue; |
| |
| memset(str, '\0', 64); |
| snprintf(str, 64, "bitmap%04d", slot); |
| cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1); |
| if (!cinfo->other_bitmap_lockres[i]) |
| return -ENOMEM; |
| |
| cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE; |
| ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW); |
| if (ret) |
| held = -1; |
| i++; |
| } |
| |
| return held; |
| } |
| |
| static void unlock_all_bitmaps(struct mddev *mddev) |
| { |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| int i; |
| |
| /* release other node's bitmap lock if they are existed */ |
| if (cinfo->other_bitmap_lockres) { |
| for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) { |
| if (cinfo->other_bitmap_lockres[i]) { |
| lockres_free(cinfo->other_bitmap_lockres[i]); |
| } |
| } |
| kfree(cinfo->other_bitmap_lockres); |
| cinfo->other_bitmap_lockres = NULL; |
| } |
| } |
| |
| static int gather_bitmaps(struct md_rdev *rdev) |
| { |
| int sn, err; |
| sector_t lo, hi; |
| struct cluster_msg cmsg = {0}; |
| struct mddev *mddev = rdev->mddev; |
| struct md_cluster_info *cinfo = mddev->cluster_info; |
| |
| cmsg.type = cpu_to_le32(RE_ADD); |
| cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); |
| err = sendmsg(cinfo, &cmsg, 1); |
| if (err) |
| goto out; |
| |
| for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) { |
| if (sn == (cinfo->slot_number - 1)) |
| continue; |
| err = md_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_start = resync_start, |
| .resync_finish = resync_finish, |
| .resync_info_update = resync_info_update, |
| .resync_info_get = resync_info_get, |
| .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 = add_new_disk, |
| .add_new_disk_cancel = add_new_disk_cancel, |
| .new_disk_ack = new_disk_ack, |
| .remove_disk = remove_disk, |
| .load_bitmaps = load_bitmaps, |
| .gather_bitmaps = gather_bitmaps, |
| .resize_bitmaps = resize_bitmaps, |
| .lock_all_bitmaps = lock_all_bitmaps, |
| .unlock_all_bitmaps = unlock_all_bitmaps, |
| .update_size = update_size, |
| }; |
| |
| static int __init cluster_init(void) |
| { |
| pr_warn("md-cluster: support raid1 and raid10 (limited support)\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_AUTHOR("SUSE"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Clustering support for MD"); |