Commit e8cbab9e authored by Mateusz Kozlowski's avatar Mateusz Kozlowski Committed by Tomasz Zawadzki
Browse files

lib/ftl: Add functions for storing the md layout into blob 



The layout will be stored in blob form in superblock v5.

Change-Id: Ibb98601b421d4577d33bc6bcc25957ad73fd3fac
Signed-off-by: default avatarMateusz Kozlowski <mateusz.kozlowski@solidigm.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/20524


Tested-by: default avatarSPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: default avatarBen Walker <ben@nvidia.com>
Reviewed-by: default avatarJim Harris <jim.harris@samsung.com>
Community-CI: Mellanox Build Bot
parent 77f5fcfa

lib/ftl/ftl_layout.c

+59 −0
Original line number Diff line number Diff line
@@ -485,3 +485,62 @@ ftl_layout_base_md_blocks(struct spdk_ftl_dev *dev) 
	md_blocks += superblock_region_blocks(dev);

	return md_blocks;

}



struct layout_blob_entry {

	uint32_t type;

	uint64_t entry_size;

	uint64_t num_entries;

} __attribute__((packed));



size_t

ftl_layout_blob_store(struct spdk_ftl_dev *dev, void *blob_buf, size_t blob_buf_sz)

{

	struct layout_blob_entry *blob_entry = blob_buf;

	struct ftl_layout_region *reg;

	enum ftl_layout_region_type reg_type;

	size_t blob_sz = 0;



	for (reg_type = 0; reg_type < FTL_LAYOUT_REGION_TYPE_MAX; reg_type++) {

		if (blob_sz + sizeof(*blob_entry) > blob_buf_sz) {

			return 0;

		}



		reg = &dev->layout.region[reg_type];

		blob_entry->type = reg_type;

		blob_entry->entry_size = reg->entry_size;

		blob_entry->num_entries = reg->num_entries;



		blob_entry++;

		blob_sz += sizeof(*blob_entry);

	}



	return blob_sz;

}



int

ftl_layout_blob_load(struct spdk_ftl_dev *dev, void *blob_buf, size_t blob_sz)

{

	struct layout_blob_entry *blob_entry = blob_buf;

	size_t blob_entry_num = blob_sz / sizeof(*blob_entry);

	struct layout_blob_entry *blob_entry_end = blob_entry + blob_entry_num;

	struct ftl_layout_region *reg;



	if (blob_sz % sizeof(*blob_entry) != 0) {

		/* Invalid blob size */

		return -1;

	}



	for (; blob_entry < blob_entry_end; blob_entry++) {

		/* Verify the type */

		if (blob_entry->type >= FTL_LAYOUT_REGION_TYPE_MAX) {

			return -1;

		}



		/* Load the entry */

		reg = &dev->layout.region[blob_entry->type];

		reg->entry_size = blob_entry->entry_size;

		reg->num_entries = blob_entry->num_entries;

	}



	return 0;

}

lib/ftl/ftl_layout.h

+22 −0
Original line number Diff line number Diff line
@@ -236,6 +236,28 @@ uint64_t ftl_layout_base_md_blocks(struct spdk_ftl_dev *dev); 
struct ftl_layout_region *ftl_layout_region_get(struct spdk_ftl_dev *dev,

		enum ftl_layout_region_type reg_type);



/**

 * @brief Store the layout data in the blob

 *

 * @param dev FTL device

 * @param blob_buf Blob buffer where the layout will be stored

 * @param blob_buf_sz Size of the blob buffer in bytes

 *

 * @return Number of bytes the stored blob entries take up. 0 if calculated value would exceed blob_buf_sz.

 */

size_t ftl_layout_blob_store(struct spdk_ftl_dev *dev, void *blob_buf, size_t blob_buf_sz);



/**

 * @brief Load the layout data from the blob

 *

 * @param dev FTL device

 * @param blob_buf Blob buffer from which the layout will be loaded

 * @param blob_sz Size of the blob buffer in bytes

 *

 * @return 0 on success, -1 on failure

 */

int ftl_layout_blob_load(struct spdk_ftl_dev *dev, void *blob_buf, size_t blob_sz);



uint64_t ftl_layout_base_offset(struct spdk_ftl_dev *dev);



#endif /* FTL_LAYOUT_H */