|
|
@@ -0,0 +1,965 @@
|
|
|
+/*
|
|
|
+ * 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
|
|
|
+
|
|
|
+
|
|
|
+struct md_cluster_info {
|
|
|
+ /* dlm lock space and resources for clustered raid. */
|
|
|
+ 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;
|
|
|
+ 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,
|
|
|
+};
|
|
|
+
|
|
|
+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;
|
|
|
+
|
|
|
+ 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);
|
|
|
+ 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;
|
|
|
+ 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)
|
|
|
+{
|
|
|
+ if (!res)
|
|
|
+ return;
|
|
|
+
|
|
|
+ init_completion(&res->completion);
|
|
|
+ dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res);
|
|
|
+ wait_for_completion(&res->completion);
|
|
|
+
|
|
|
+ kfree(res->name);
|
|
|
+ kfree(res->lksb.sb_lvbptr);
|
|
|
+ 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)
|
|
|
+{
|
|
|
+ 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)
|
|
|
+{
|
|
|
+}
|
|
|
+
|
|
|
+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);
|
|
|
+ set_bit(slot->slot - 1, &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_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;
|
|
|
+ complete(&cinfo->completion);
|
|
|
+}
|
|
|
+
|
|
|
+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 md_cluster_info *cinfo,
|
|
|
+ int slot, sector_t lo, sector_t hi)
|
|
|
+{
|
|
|
+ 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;
|
|
|
+ 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=");
|
|
|
+ pretty_uuid(disk_uuid + len, 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->cluster_info, 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;
|
|
|
+ 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;
|
|
|
+
|
|
|
+ /*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*/
|
|
|
+ dlm_unlock_sync(ack_lockres);
|
|
|
+ /*up-convert to EX on message_lockres*/
|
|
|
+ dlm_lock_sync(message_lockres, DLM_LOCK_EX);
|
|
|
+ /*get CR on ack_lockres again*/
|
|
|
+ dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
|
|
|
+ /*release CR on message_lockres*/
|
|
|
+ dlm_unlock_sync(message_lockres);
|
|
|
+}
|
|
|
+
|
|
|
+/* 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 CR
|
|
|
+ * 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 CR on Message*/
|
|
|
+ error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CR);
|
|
|
+ if (error) {
|
|
|
+ pr_err("md-cluster: failed to convert EX to CR on MESSAGE(%d)\n",
|
|
|
+ error);
|
|
|
+ goto failed_message;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*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:
|
|
|
+ dlm_unlock_sync(cinfo->message_lockres);
|
|
|
+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];
|
|
|
+
|
|
|
+
|
|
|
+ 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)
|
|
|
+ goto out;
|
|
|
+ /* TODO: Read the disk bitmap sb and check if it needs recovery */
|
|
|
+ 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];
|
|
|
+
|
|
|
+ if (!try_module_get(THIS_MODULE))
|
|
|
+ return -ENOENT;
|
|
|
+
|
|
|
+ cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
|
|
|
+ if (!cinfo)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ init_completion(&cinfo->completion);
|
|
|
+
|
|
|
+ mutex_init(&cinfo->sb_mutex);
|
|
|
+ mddev->cluster_info = cinfo;
|
|
|
+
|
|
|
+ memset(str, 0, 64);
|
|
|
+ pretty_uuid(str, 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;
|
|
|
+ }
|
|
|
+ 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");
|
|
|
+ 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;
|
|
|
+ }
|
|
|
+
|
|
|
+ INIT_LIST_HEAD(&cinfo->suspend_list);
|
|
|
+ spin_lock_init(&cinfo->suspend_lock);
|
|
|
+
|
|
|
+ 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);
|
|
|
+ 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;
|
|
|
+}
|
|
|
+
|
|
|
+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->sb_lock);
|
|
|
+ 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 void resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
|
|
|
+{
|
|
|
+ struct md_cluster_info *cinfo = mddev->cluster_info;
|
|
|
+
|
|
|
+ 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);
|
|
|
+}
|
|
|
+
|
|
|
+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_send(struct mddev *mddev, enum msg_type type,
|
|
|
+ sector_t lo, sector_t hi)
|
|
|
+{
|
|
|
+ struct md_cluster_info *cinfo = mddev->cluster_info;
|
|
|
+ struct cluster_msg cmsg;
|
|
|
+ int slot = cinfo->slot_number - 1;
|
|
|
+
|
|
|
+ pr_info("%s:%d lo: %llu hi: %llu\n", __func__, __LINE__,
|
|
|
+ (unsigned long long)lo,
|
|
|
+ (unsigned long long)hi);
|
|
|
+ resync_info_update(mddev, lo, hi);
|
|
|
+ cmsg.type = cpu_to_le32(type);
|
|
|
+ cmsg.slot = cpu_to_le32(slot);
|
|
|
+ cmsg.low = cpu_to_le64(lo);
|
|
|
+ cmsg.high = cpu_to_le64(hi);
|
|
|
+ return sendmsg(cinfo, &cmsg);
|
|
|
+}
|
|
|
+
|
|
|
+static int resync_start(struct mddev *mddev, sector_t lo, sector_t hi)
|
|
|
+{
|
|
|
+ pr_info("%s:%d\n", __func__, __LINE__);
|
|
|
+ return resync_send(mddev, RESYNCING, lo, hi);
|
|
|
+}
|
|
|
+
|
|
|
+static void resync_finish(struct mddev *mddev)
|
|
|
+{
|
|
|
+ pr_info("%s:%d\n", __func__, __LINE__);
|
|
|
+ resync_send(mddev, RESYNCING, 0, 0);
|
|
|
+}
|
|
|
+
|
|
|
+static int area_resyncing(struct mddev *mddev, sector_t lo, sector_t hi)
|
|
|
+{
|
|
|
+ struct md_cluster_info *cinfo = mddev->cluster_info;
|
|
|
+ int ret = 0;
|
|
|
+ struct suspend_info *s;
|
|
|
+
|
|
|
+ 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,
|
|
|
+ .resync_start = resync_start,
|
|
|
+ .resync_finish = resync_finish,
|
|
|
+ .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");
|
NeilBrown