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Commit 9cb6653f authored by Joe Thornber's avatar Joe Thornber Committed by Alasdair G Kergon
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dm thin metadata: factor out __write_initial_superblock 



Factor out __write_initial_superblock and also pull some other initial
creation code out of dm_pool_metadata_open.

Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 6a0ebd31

drivers/md/dm-thin-metadata.c

+58 −51
Original line number Diff line number Diff line
@@ -422,6 +422,41 @@ static void __setup_btree_details(struct dm_pool_metadata *pmd) 
	pmd->details_info.value_type.equal = NULL;

}



static int __write_initial_superblock(struct dm_pool_metadata *pmd)

{

	int r;

	struct dm_block *sblock;

	struct thin_disk_superblock *disk_super;

	sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT;



	if (bdev_size > THIN_METADATA_MAX_SECTORS)

		bdev_size = THIN_METADATA_MAX_SECTORS;



	r = superblock_lock_zero(pmd, &sblock);

	if (r)

		return r;



	disk_super = dm_block_data(sblock);

	disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC);

	disk_super->version = cpu_to_le32(THIN_VERSION);

	disk_super->time = 0;

	disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE >> SECTOR_SHIFT);

	disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT);

	disk_super->data_block_size = cpu_to_le32(pmd->data_block_size);



	r = dm_bm_unlock(sblock);

	if (r)

		return r;



	pmd->flags = 0;

	r = dm_pool_commit_metadata(pmd);

	if (r < 0)

		DMERR("%s: dm_pool_commit_metadata() failed, error = %d",

		      __func__, r);



	return r;

}



static int __open_or_format_metadata(struct dm_pool_metadata *pmd,

				     struct dm_block_manager *bm,

				     dm_block_t nr_blocks, int create)
@@ -495,6 +530,23 @@ static int __open_or_format_metadata(struct dm_pool_metadata *pmd, 
	pmd->trans_id = 0;

	pmd->flags = 0;



	if (!create)

		return 0;



	r = dm_btree_empty(&pmd->info, &pmd->root);

	if (r < 0)

		goto bad_data_sm;



	r = dm_btree_empty(&pmd->details_info, &pmd->details_root);

	if (r < 0) {

		DMERR("couldn't create devices root");

		goto bad_data_sm;

	}



	r = __write_initial_superblock(pmd);

	if (r)

		goto bad_data_sm;



	return 0;



bad_data_sm:
@@ -695,11 +747,8 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, 
					       sector_t data_block_size)

{

	int r;

	struct thin_disk_superblock *disk_super;

	struct dm_pool_metadata *pmd;

	sector_t bdev_size = i_size_read(bdev->bd_inode) >> SECTOR_SHIFT;

	int create;

	struct dm_block *sblock;



	pmd = kmalloc(sizeof(*pmd), GFP_KERNEL);

	if (!pmd) {
@@ -711,6 +760,7 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, 
	pmd->time = 0;

	INIT_LIST_HEAD(&pmd->thin_devices);

	pmd->bdev = bdev;

	pmd->data_block_size = data_block_size;



	r = __create_persistent_data_objects(pmd, 0, &create);

	if (r) {
@@ -720,57 +770,14 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, 


	if (!create) {

		r = __begin_transaction(pmd);

		if (r < 0)

			goto bad;

		return pmd;

	}



	/*

	 * Create.

	 */

	r = superblock_lock_zero(pmd, &sblock);

	if (r)

		goto bad;



	if (bdev_size > THIN_METADATA_MAX_SECTORS)

		bdev_size = THIN_METADATA_MAX_SECTORS;



	disk_super = dm_block_data(sblock);

	disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC);

	disk_super->version = cpu_to_le32(THIN_VERSION);

	disk_super->time = 0;

	disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE >> SECTOR_SHIFT);

	disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT);

	disk_super->data_block_size = cpu_to_le32(data_block_size);



	r = dm_bm_unlock(sblock);

	if (r < 0)

		goto bad;



	r = dm_btree_empty(&pmd->info, &pmd->root);

	if (r < 0)

		goto bad;



	r = dm_btree_empty(&pmd->details_info, &pmd->details_root);

		if (r < 0) {

		DMERR("couldn't create devices root");

		goto bad;

			if (dm_pool_metadata_close(pmd) < 0)

				DMWARN("%s: dm_pool_metadata_close() failed.", __func__);

			return ERR_PTR(r);

		}



	pmd->flags = 0;

	r = dm_pool_commit_metadata(pmd);

	if (r < 0) {

		DMERR("%s: dm_pool_commit_metadata() failed, error = %d",

		      __func__, r);

		goto bad;

	}



	return pmd;



bad:

	if (dm_pool_metadata_close(pmd) < 0)

		DMWARN("%s: dm_pool_metadata_close() failed.", __func__);

	return ERR_PTR(r);

}



int dm_pool_metadata_close(struct dm_pool_metadata *pmd)