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![Guoqing Jiang](/assets/img/avatar_default.png)
We don't need to run the full path of recv_daemon if process_recvd_msg doesn't return 0. Reviewed-by: NeilBrown <neilb@suse.com> Signed-off-by: Guoqing Jiang <gqjiang@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>
1258 lines
34 KiB
C
1258 lines
34 KiB
C
/*
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* Copyright (C) 2015, SUSE
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/dlm.h>
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#include <linux/sched.h>
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#include <linux/raid/md_p.h>
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#include "md.h"
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#include "bitmap.h"
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#include "md-cluster.h"
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#define LVB_SIZE 64
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#define NEW_DEV_TIMEOUT 5000
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struct dlm_lock_resource {
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dlm_lockspace_t *ls;
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struct dlm_lksb lksb;
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char *name; /* lock name. */
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uint32_t flags; /* flags to pass to dlm_lock() */
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struct completion completion; /* completion for synchronized locking */
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void (*bast)(void *arg, int mode); /* blocking AST function pointer*/
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struct mddev *mddev; /* pointing back to mddev. */
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int mode;
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};
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struct suspend_info {
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int slot;
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sector_t lo;
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sector_t hi;
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struct list_head list;
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};
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struct resync_info {
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__le64 lo;
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__le64 hi;
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};
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/* md_cluster_info flags */
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#define MD_CLUSTER_WAITING_FOR_NEWDISK 1
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#define MD_CLUSTER_SUSPEND_READ_BALANCING 2
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#define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3
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/* Lock the send communication. This is done through
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* bit manipulation as opposed to a mutex in order to
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* accomodate lock and hold. See next comment.
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*/
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#define MD_CLUSTER_SEND_LOCK 4
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/* If cluster operations (such as adding a disk) must lock the
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* communication channel, so as to perform extra operations
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* (update metadata) and no other operation is allowed on the
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* MD. Token needs to be locked and held until the operation
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* completes witha md_update_sb(), which would eventually release
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* the lock.
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*/
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#define MD_CLUSTER_SEND_LOCKED_ALREADY 5
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/* We should receive message after node joined cluster and
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* set up all the related infos such as bitmap and personality */
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#define MD_CLUSTER_ALREADY_IN_CLUSTER 6
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#define MD_CLUSTER_PENDING_RECV_EVENT 7
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struct md_cluster_info {
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/* dlm lock space and resources for clustered raid. */
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dlm_lockspace_t *lockspace;
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int slot_number;
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struct completion completion;
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struct mutex recv_mutex;
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struct dlm_lock_resource *bitmap_lockres;
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struct dlm_lock_resource **other_bitmap_lockres;
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struct dlm_lock_resource *resync_lockres;
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struct list_head suspend_list;
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spinlock_t suspend_lock;
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struct md_thread *recovery_thread;
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unsigned long recovery_map;
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/* communication loc resources */
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struct dlm_lock_resource *ack_lockres;
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struct dlm_lock_resource *message_lockres;
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struct dlm_lock_resource *token_lockres;
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struct dlm_lock_resource *no_new_dev_lockres;
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struct md_thread *recv_thread;
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struct completion newdisk_completion;
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wait_queue_head_t wait;
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unsigned long state;
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/* record the region in RESYNCING message */
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sector_t sync_low;
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sector_t sync_hi;
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};
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enum msg_type {
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METADATA_UPDATED = 0,
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RESYNCING,
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NEWDISK,
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REMOVE,
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RE_ADD,
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BITMAP_NEEDS_SYNC,
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};
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struct cluster_msg {
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__le32 type;
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__le32 slot;
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/* TODO: Unionize this for smaller footprint */
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__le64 low;
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__le64 high;
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char uuid[16];
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__le32 raid_slot;
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};
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static void sync_ast(void *arg)
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{
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struct dlm_lock_resource *res;
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res = arg;
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complete(&res->completion);
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}
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static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
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{
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int ret = 0;
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ret = dlm_lock(res->ls, mode, &res->lksb,
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res->flags, res->name, strlen(res->name),
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0, sync_ast, res, res->bast);
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if (ret)
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return ret;
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wait_for_completion(&res->completion);
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if (res->lksb.sb_status == 0)
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res->mode = mode;
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return res->lksb.sb_status;
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}
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static int dlm_unlock_sync(struct dlm_lock_resource *res)
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{
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return dlm_lock_sync(res, DLM_LOCK_NL);
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}
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static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
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char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
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{
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struct dlm_lock_resource *res = NULL;
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int ret, namelen;
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struct md_cluster_info *cinfo = mddev->cluster_info;
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res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
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if (!res)
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return NULL;
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init_completion(&res->completion);
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res->ls = cinfo->lockspace;
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res->mddev = mddev;
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res->mode = DLM_LOCK_IV;
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namelen = strlen(name);
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res->name = kzalloc(namelen + 1, GFP_KERNEL);
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if (!res->name) {
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pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
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goto out_err;
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}
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strlcpy(res->name, name, namelen + 1);
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if (with_lvb) {
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res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL);
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if (!res->lksb.sb_lvbptr) {
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pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name);
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goto out_err;
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}
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res->flags = DLM_LKF_VALBLK;
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}
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if (bastfn)
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res->bast = bastfn;
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res->flags |= DLM_LKF_EXPEDITE;
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ret = dlm_lock_sync(res, DLM_LOCK_NL);
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if (ret) {
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pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
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goto out_err;
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}
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res->flags &= ~DLM_LKF_EXPEDITE;
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res->flags |= DLM_LKF_CONVERT;
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return res;
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out_err:
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kfree(res->lksb.sb_lvbptr);
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kfree(res->name);
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kfree(res);
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return NULL;
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}
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static void lockres_free(struct dlm_lock_resource *res)
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{
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int ret;
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if (!res)
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return;
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/* cancel a lock request or a conversion request that is blocked */
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res->flags |= DLM_LKF_CANCEL;
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retry:
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ret = dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res);
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if (unlikely(ret != 0)) {
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pr_info("%s: failed to unlock %s return %d\n", __func__, res->name, ret);
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/* if a lock conversion is cancelled, then the lock is put
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* back to grant queue, need to ensure it is unlocked */
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if (ret == -DLM_ECANCEL)
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goto retry;
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}
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res->flags &= ~DLM_LKF_CANCEL;
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wait_for_completion(&res->completion);
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kfree(res->name);
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kfree(res->lksb.sb_lvbptr);
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kfree(res);
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}
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static void add_resync_info(struct dlm_lock_resource *lockres,
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sector_t lo, sector_t hi)
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{
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struct resync_info *ri;
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ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
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ri->lo = cpu_to_le64(lo);
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ri->hi = cpu_to_le64(hi);
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}
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static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres)
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{
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struct resync_info ri;
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struct suspend_info *s = NULL;
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sector_t hi = 0;
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dlm_lock_sync(lockres, DLM_LOCK_CR);
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memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
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hi = le64_to_cpu(ri.hi);
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if (hi > 0) {
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s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
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if (!s)
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goto out;
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s->hi = hi;
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s->lo = le64_to_cpu(ri.lo);
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}
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dlm_unlock_sync(lockres);
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out:
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return s;
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}
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static void recover_bitmaps(struct md_thread *thread)
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{
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struct mddev *mddev = thread->mddev;
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struct md_cluster_info *cinfo = mddev->cluster_info;
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struct dlm_lock_resource *bm_lockres;
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char str[64];
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int slot, ret;
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struct suspend_info *s, *tmp;
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sector_t lo, hi;
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while (cinfo->recovery_map) {
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slot = fls64((u64)cinfo->recovery_map) - 1;
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/* Clear suspend_area associated with the bitmap */
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spin_lock_irq(&cinfo->suspend_lock);
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list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
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if (slot == s->slot) {
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list_del(&s->list);
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kfree(s);
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}
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spin_unlock_irq(&cinfo->suspend_lock);
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snprintf(str, 64, "bitmap%04d", slot);
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bm_lockres = lockres_init(mddev, str, NULL, 1);
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if (!bm_lockres) {
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pr_err("md-cluster: Cannot initialize bitmaps\n");
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goto clear_bit;
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}
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ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
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if (ret) {
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pr_err("md-cluster: Could not DLM lock %s: %d\n",
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str, ret);
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goto clear_bit;
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}
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ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
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if (ret) {
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pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
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goto dlm_unlock;
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}
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if (hi > 0) {
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if (lo < mddev->recovery_cp)
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mddev->recovery_cp = lo;
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/* wake up thread to continue resync in case resync
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* is not finished */
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if (mddev->recovery_cp != MaxSector) {
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set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
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md_wakeup_thread(mddev->thread);
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}
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}
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dlm_unlock:
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dlm_unlock_sync(bm_lockres);
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clear_bit:
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lockres_free(bm_lockres);
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clear_bit(slot, &cinfo->recovery_map);
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}
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}
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static void recover_prep(void *arg)
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{
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struct mddev *mddev = arg;
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struct md_cluster_info *cinfo = mddev->cluster_info;
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set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
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}
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static void __recover_slot(struct mddev *mddev, int slot)
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{
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struct md_cluster_info *cinfo = mddev->cluster_info;
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set_bit(slot, &cinfo->recovery_map);
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if (!cinfo->recovery_thread) {
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cinfo->recovery_thread = md_register_thread(recover_bitmaps,
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mddev, "recover");
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if (!cinfo->recovery_thread) {
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pr_warn("md-cluster: Could not create recovery thread\n");
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return;
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}
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}
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md_wakeup_thread(cinfo->recovery_thread);
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}
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static void recover_slot(void *arg, struct dlm_slot *slot)
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{
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struct mddev *mddev = arg;
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struct md_cluster_info *cinfo = mddev->cluster_info;
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pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
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mddev->bitmap_info.cluster_name,
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slot->nodeid, slot->slot,
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cinfo->slot_number);
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/* deduct one since dlm slot starts from one while the num of
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* cluster-md begins with 0 */
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__recover_slot(mddev, slot->slot - 1);
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}
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static void recover_done(void *arg, struct dlm_slot *slots,
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int num_slots, int our_slot,
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uint32_t generation)
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{
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struct mddev *mddev = arg;
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struct md_cluster_info *cinfo = mddev->cluster_info;
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cinfo->slot_number = our_slot;
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/* completion is only need to be complete when node join cluster,
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* it doesn't need to run during another node's failure */
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if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) {
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complete(&cinfo->completion);
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clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
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}
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clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
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}
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/* the ops is called when node join the cluster, and do lock recovery
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* if node failure occurs */
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static const struct dlm_lockspace_ops md_ls_ops = {
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.recover_prep = recover_prep,
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.recover_slot = recover_slot,
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.recover_done = recover_done,
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};
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/*
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* The BAST function for the ack lock resource
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* This function wakes up the receive thread in
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* order to receive and process the message.
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*/
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static void ack_bast(void *arg, int mode)
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{
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struct dlm_lock_resource *res = arg;
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struct md_cluster_info *cinfo = res->mddev->cluster_info;
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if (mode == DLM_LOCK_EX) {
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if (test_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state))
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md_wakeup_thread(cinfo->recv_thread);
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else
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set_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state);
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}
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}
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static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot)
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{
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struct suspend_info *s, *tmp;
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list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
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if (slot == s->slot) {
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list_del(&s->list);
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kfree(s);
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break;
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}
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}
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static void remove_suspend_info(struct mddev *mddev, int slot)
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{
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struct md_cluster_info *cinfo = mddev->cluster_info;
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spin_lock_irq(&cinfo->suspend_lock);
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__remove_suspend_info(cinfo, slot);
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spin_unlock_irq(&cinfo->suspend_lock);
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mddev->pers->quiesce(mddev, 2);
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}
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static void process_suspend_info(struct mddev *mddev,
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int slot, sector_t lo, sector_t hi)
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{
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struct md_cluster_info *cinfo = mddev->cluster_info;
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struct suspend_info *s;
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if (!hi) {
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remove_suspend_info(mddev, slot);
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set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
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md_wakeup_thread(mddev->thread);
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return;
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}
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/*
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* The bitmaps are not same for different nodes
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* if RESYNCING is happening in one node, then
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* the node which received the RESYNCING message
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* probably will perform resync with the region
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* [lo, hi] again, so we could reduce resync time
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* a lot if we can ensure that the bitmaps among
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* different nodes are match up well.
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*
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* sync_low/hi is used to record the region which
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* arrived in the previous RESYNCING message,
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*
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* Call bitmap_sync_with_cluster to clear
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* NEEDED_MASK and set RESYNC_MASK since
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* resync thread is running in another node,
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* so we don't need to do the resync again
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* with the same section */
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bitmap_sync_with_cluster(mddev, cinfo->sync_low,
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cinfo->sync_hi,
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lo, hi);
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cinfo->sync_low = lo;
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cinfo->sync_hi = hi;
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s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
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if (!s)
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return;
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s->slot = slot;
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s->lo = lo;
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s->hi = hi;
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mddev->pers->quiesce(mddev, 1);
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mddev->pers->quiesce(mddev, 0);
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spin_lock_irq(&cinfo->suspend_lock);
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/* Remove existing entry (if exists) before adding */
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__remove_suspend_info(cinfo, slot);
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list_add(&s->list, &cinfo->suspend_list);
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spin_unlock_irq(&cinfo->suspend_lock);
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mddev->pers->quiesce(mddev, 2);
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}
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|
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static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
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{
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char disk_uuid[64];
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struct md_cluster_info *cinfo = mddev->cluster_info;
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char event_name[] = "EVENT=ADD_DEVICE";
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char raid_slot[16];
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char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
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int len;
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len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
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sprintf(disk_uuid + len, "%pU", cmsg->uuid);
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snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot));
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pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
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init_completion(&cinfo->newdisk_completion);
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set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
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kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
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wait_for_completion_timeout(&cinfo->newdisk_completion,
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NEW_DEV_TIMEOUT);
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clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
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|
}
|
|
|
|
|
|
static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
|
|
{
|
|
struct md_cluster_info *cinfo = mddev->cluster_info;
|
|
mddev->good_device_nr = le32_to_cpu(msg->raid_slot);
|
|
set_bit(MD_RELOAD_SB, &mddev->flags);
|
|
dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
|
|
md_wakeup_thread(mddev->thread);
|
|
}
|
|
|
|
static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
|
|
{
|
|
struct md_rdev *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));
|
|
}
|
|
|
|
static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
|
|
{
|
|
struct md_rdev *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));
|
|
}
|
|
|
|
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 it's 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 RESYNCING:
|
|
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;
|
|
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);
|
|
|
|
/* 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)
|
|
{
|
|
wait_event(cinfo->wait,
|
|
!test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state));
|
|
|
|
return lock_token(cinfo);
|
|
}
|
|
|
|
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)
|
|
{
|
|
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)) {
|
|
lockres_free(bm_lockres);
|
|
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);
|
|
init_waitqueue_head(&cinfo->wait);
|
|
mutex_init(&cinfo->recv_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->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)
|
|
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)
|
|
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)
|
|
goto err;
|
|
|
|
return 0;
|
|
err:
|
|
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);
|
|
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 */
|
|
if (cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector)
|
|
resync_bitmap(mddev);
|
|
|
|
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);
|
|
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;
|
|
|
|
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)
|
|
return 0;
|
|
|
|
return lock_token(cinfo);
|
|
}
|
|
|
|
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 resync_start(struct mddev *mddev)
|
|
{
|
|
struct md_cluster_info *cinfo = mddev->cluster_info;
|
|
return dlm_lock_sync(cinfo->resync_lockres, DLM_LOCK_EX);
|
|
}
|
|
|
|
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);
|
|
|
|
return sendmsg(cinfo, &cmsg);
|
|
}
|
|
|
|
static int resync_finish(struct mddev *mddev)
|
|
{
|
|
struct md_cluster_info *cinfo = mddev->cluster_info;
|
|
dlm_unlock_sync(cinfo->resync_lockres);
|
|
return resync_info_update(mddev, 0, 0);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* 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);
|
|
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;
|
|
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);
|
|
}
|
|
|
|
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 = kzalloc((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]) {
|
|
dlm_unlock_sync(cinfo->other_bitmap_lockres[i]);
|
|
lockres_free(cinfo->other_bitmap_lockres[i]);
|
|
}
|
|
}
|
|
kfree(cinfo->other_bitmap_lockres);
|
|
}
|
|
}
|
|
|
|
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);
|
|
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_start = resync_start,
|
|
.resync_finish = resync_finish,
|
|
.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 = 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,
|
|
.lock_all_bitmaps = lock_all_bitmaps,
|
|
.unlock_all_bitmaps = unlock_all_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_AUTHOR("SUSE");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Clustering support for MD");
|