Exemplo n.º 1
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 suspend_info *s;

	if (!hi) {
		remove_suspend_info(mddev, slot);
		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
		md_wakeup_thread(mddev->thread);
		return;
	}
	s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
	if (!s)
		return;
	s->slot = slot;
	s->lo = lo;
	s->hi = hi;
	mddev->pers->quiesce(mddev, 1);
	mddev->pers->quiesce(mddev, 0);
	spin_lock_irq(&cinfo->suspend_lock);
	/* Remove existing entry (if exists) before adding */
	__remove_suspend_info(cinfo, slot);
	list_add(&s->list, &cinfo->suspend_list);
	spin_unlock_irq(&cinfo->suspend_lock);
	mddev->pers->quiesce(mddev, 2);
}
Exemplo n.º 2
0
/*
 * 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);
}
Exemplo n.º 3
0
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);
}
Exemplo n.º 4
0
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) {
			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) {
			    set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
			    md_wakeup_thread(mddev->thread);
			}
		}
dlm_unlock:
		dlm_unlock_sync(bm_lockres);
clear_bit:
		lockres_free(bm_lockres);
		clear_bit(slot, &cinfo->recovery_map);
	}
}
Exemplo n.º 5
0
static void multipath_reschedule_retry (struct multipath_bh *mp_bh)
{
	unsigned long flags;
	mddev_t *mddev = mp_bh->mddev;
	multipath_conf_t *conf = mddev_to_conf(mddev);

	spin_lock_irqsave(&conf->device_lock, flags);
	list_add(&mp_bh->retry_list, &conf->retry_list);
	spin_unlock_irqrestore(&conf->device_lock, flags);
	md_wakeup_thread(mddev->thread);
}
Exemplo n.º 6
0
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);
}
Exemplo n.º 7
0
/*
 * 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);
	}
}
Exemplo n.º 8
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 suspend_info *s;

	if (!hi) {
		remove_suspend_info(mddev, slot);
		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
		md_wakeup_thread(mddev->thread);
		return;
	}

	/*
	 * 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 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 */
	bitmap_sync_with_cluster(mddev, cinfo->sync_low,
					cinfo->sync_hi,
					lo, hi);
	cinfo->sync_low = lo;
	cinfo->sync_hi = hi;

	s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
	if (!s)
		return;
	s->slot = slot;
	s->lo = lo;
	s->hi = hi;
	mddev->pers->quiesce(mddev, 1);
	mddev->pers->quiesce(mddev, 0);
	spin_lock_irq(&cinfo->suspend_lock);
	/* Remove existing entry (if exists) before adding */
	__remove_suspend_info(cinfo, slot);
	list_add(&s->list, &cinfo->suspend_list);
	spin_unlock_irq(&cinfo->suspend_lock);
	mddev->pers->quiesce(mddev, 2);
}
Exemplo n.º 9
0
static void multipath_reschedule_retry (struct multipath_bh *mp_bh)
{
	unsigned long flags;
	mddev_t *mddev = mp_bh->mddev;

	spin_lock_irqsave(&retry_list_lock, flags);
	if (multipath_retry_list == NULL)
		multipath_retry_tail = &multipath_retry_list;
	*multipath_retry_tail = mp_bh;
	multipath_retry_tail = &mp_bh->next_mp;
	mp_bh->next_mp = NULL;
	spin_unlock_irqrestore(&retry_list_lock, flags);
	md_wakeup_thread(mddev->thread);
}
Exemplo n.º 10
0
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));
}
Exemplo n.º 11
0
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);
}
Exemplo n.º 12
0
/*
 * write out a page to a file
 */
static int write_page(struct bitmap *bitmap, struct page *page, int wait)
{
    int ret = -ENOMEM;

    if (bitmap->file == NULL)
        return write_sb_page(bitmap->mddev, bitmap->offset, page, wait);

    flush_dcache_page(page); /* make sure visible to anyone reading the file */

    if (wait)
        lock_page(page);
    else {
        if (TestSetPageLocked(page))
            return -EAGAIN; /* already locked */
        if (PageWriteback(page)) {
            unlock_page(page);
            return -EAGAIN;
        }
    }

    ret = page->mapping->a_ops->prepare_write(bitmap->file, page, 0, PAGE_SIZE);
    if (!ret)
        ret = page->mapping->a_ops->commit_write(bitmap->file, page, 0,
                PAGE_SIZE);
    if (ret) {
        unlock_page(page);
        return ret;
    }

    set_page_dirty(page); /* force it to be written out */

    if (!wait) {
        /* add to list to be waited for by daemon */
        struct page_list *item = mempool_alloc(bitmap->write_pool, GFP_NOIO);
        item->page = page;
        get_page(page);
        spin_lock(&bitmap->write_lock);
        list_add(&item->list, &bitmap->complete_pages);
        spin_unlock(&bitmap->write_lock);
        md_wakeup_thread(bitmap->writeback_daemon);
    }
    return write_one_page(page, wait);
}
Exemplo n.º 13
0
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);
}
Exemplo n.º 14
0
/* * bitmap_init_from_disk -- called at bitmap_create time to initialize
 * the in-memory bitmap from the on-disk bitmap -- also, sets up the
 * memory mapping of the bitmap file
 * Special cases:
 *   if there's no bitmap file, or if the bitmap file had been
 *   previously kicked from the array, we mark all the bits as
 *   1's in order to cause a full resync.
 *
 * We ignore all bits for sectors that end earlier than 'start'.
 * This is used when reading an out-of-date bitmap...
 */
static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
{
	unsigned long i, chunks, index, oldindex, bit;
	struct page *page = NULL, *oldpage = NULL;
	unsigned long num_pages, bit_cnt = 0;
	struct file *file;
	unsigned long bytes, offset;
	int outofdate;
	int ret = -ENOSPC;
	void *paddr;

	chunks = bitmap->chunks;
	file = bitmap->file;

	BUG_ON(!file && !bitmap->offset);

#ifdef INJECT_FAULTS_3
	outofdate = 1;
#else
	outofdate = bitmap->flags & BITMAP_STALE;
#endif
	if (outofdate)
		printk(KERN_INFO "%s: bitmap file is out of date, doing full "
			"recovery\n", bmname(bitmap));

	bytes = (chunks + 7) / 8;

	num_pages = (bytes + sizeof(bitmap_super_t) + PAGE_SIZE - 1) / PAGE_SIZE;

	if (file && i_size_read(file->f_mapping->host) < bytes + sizeof(bitmap_super_t)) {
		printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n",
			bmname(bitmap),
			(unsigned long) i_size_read(file->f_mapping->host),
			bytes + sizeof(bitmap_super_t));
		goto out;
	}

	ret = -ENOMEM;

	bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL);
	if (!bitmap->filemap)
		goto out;

	/* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */
	bitmap->filemap_attr = kzalloc(
		roundup( DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
		GFP_KERNEL);
	if (!bitmap->filemap_attr)
		goto out;

	oldindex = ~0L;

	for (i = 0; i < chunks; i++) {
		int b;
		index = file_page_index(i);
		bit = file_page_offset(i);
		if (index != oldindex) { /* this is a new page, read it in */
			int count;
			/* unmap the old page, we're done with it */
			if (index == num_pages-1)
				count = bytes + sizeof(bitmap_super_t)
					- index * PAGE_SIZE;
			else
				count = PAGE_SIZE;
			if (index == 0) {
				/*
				 * if we're here then the superblock page
				 * contains some bits (PAGE_SIZE != sizeof sb)
				 * we've already read it in, so just use it
				 */
				page = bitmap->sb_page;
				offset = sizeof(bitmap_super_t);
			} else if (file) {
				page = read_page(file, index, bitmap, count);
				offset = 0;
			} else {
				page = read_sb_page(bitmap->mddev, bitmap->offset, index);
				offset = 0;
			}
			if (IS_ERR(page)) { /* read error */
				ret = PTR_ERR(page);
				goto out;
			}

			oldindex = index;
			oldpage = page;

			if (outofdate) {
				/*
				 * if bitmap is out of date, dirty the
			 	 * whole page and write it out
				 */
				paddr = kmap_atomic(page, KM_USER0);
				memset(paddr + offset, 0xff,
				       PAGE_SIZE - offset);
				kunmap_atomic(paddr, KM_USER0);
				ret = write_page(bitmap, page, 1);
				if (ret) {
					/* release, page not in filemap yet */
					put_page(page);
					goto out;
				}
			}

			bitmap->filemap[bitmap->file_pages++] = page;
			bitmap->last_page_size = count;
		}
		paddr = kmap_atomic(page, KM_USER0);
		if (bitmap->flags & BITMAP_HOSTENDIAN)
			b = test_bit(bit, paddr);
		else
			b = ext2_test_bit(bit, paddr);
		kunmap_atomic(paddr, KM_USER0);
		if (b) {
			/* if the disk bit is set, set the memory bit */
			bitmap_set_memory_bits(bitmap, i << CHUNK_BLOCK_SHIFT(bitmap),
					       ((i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) >= start)
				);
			bit_cnt++;
			set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN);
		}
	}

 	/* everything went OK */
	ret = 0;
	bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET);

	if (bit_cnt) { /* Kick recovery if any bits were set */
		set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery);
		md_wakeup_thread(bitmap->mddev->thread);
	}

out:
	printk(KERN_INFO "%s: bitmap initialized from disk: "
		"read %lu/%lu pages, set %lu bits, status: %d\n",
		bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, ret);

	return ret;
}