drivers/md/persistent-data/dm-space-map-metadata.h

Source file repositories/reference/linux-study-clean/drivers/md/persistent-data/dm-space-map-metadata.h

File Facts

System
Linux kernel
Corpus path
drivers/md/persistent-data/dm-space-map-metadata.h
Extension
.h
Size
1186 bytes
Lines
46
Domain
Driver Families
Bucket
drivers/md
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef DM_SPACE_MAP_METADATA_H
#define DM_SPACE_MAP_METADATA_H

#include "dm-transaction-manager.h"

#define DM_SM_METADATA_BLOCK_SIZE (4096 >> SECTOR_SHIFT)

/*
 * The metadata device is currently limited in size.
 *
 * We have one block of index, which can hold 255 index entries.  Each
 * index entry contains allocation info about ~16k metadata blocks.
 */
#define DM_SM_METADATA_MAX_BLOCKS (255 * ((1 << 14) - 64))
#define DM_SM_METADATA_MAX_SECTORS (DM_SM_METADATA_MAX_BLOCKS * DM_SM_METADATA_BLOCK_SIZE)

/*
 * Unfortunately we have to use two-phase construction due to the cycle
 * between the tm and sm.
 */
struct dm_space_map *dm_sm_metadata_init(void);

/*
 * Create a fresh space map.
 */
int dm_sm_metadata_create(struct dm_space_map *sm,
			  struct dm_transaction_manager *tm,
			  dm_block_t nr_blocks,
			  dm_block_t superblock);

/*
 * Open from a previously-recorded root.
 */
int dm_sm_metadata_open(struct dm_space_map *sm,
			struct dm_transaction_manager *tm,
			void *root_le, size_t len);

#endif	/* DM_SPACE_MAP_METADATA_H */

Annotation

Implementation Notes