Commit 1c865749 authored by Richard Weinberger's avatar Richard Weinberger Committed by Artem Bityutskiy

UBI: Add fastmap on-flash data structures

Add the on-flash data structures neeed by fastmap
to ubi-media.h
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
parent 55393ba1
......@@ -375,4 +375,141 @@ struct ubi_vtbl_record {
__be32 crc;
} __packed;
/* UBI fastmap on-flash data structures */
#define UBI_FM_SB_VOLUME_ID (UBI_LAYOUT_VOLUME_ID + 1)
#define UBI_FM_DATA_VOLUME_ID (UBI_LAYOUT_VOLUME_ID + 2)
/* fastmap on-flash data structure format version */
#define UBI_FM_FMT_VERSION 1
#define UBI_FM_SB_MAGIC 0x7B11D69F
#define UBI_FM_HDR_MAGIC 0xD4B82EF7
#define UBI_FM_VHDR_MAGIC 0xFA370ED1
#define UBI_FM_POOL_MAGIC 0x67AF4D08
#define UBI_FM_EBA_MAGIC 0xf0c040a8
/* A fastmap supber block can be located between PEB 0 and
* UBI_FM_MAX_START */
#define UBI_FM_MAX_START 64
/* A fastmap can use up to UBI_FM_MAX_BLOCKS PEBs */
#define UBI_FM_MAX_BLOCKS 32
/* 5% of the total number of PEBs have to be scanned while attaching
* from a fastmap.
* But the size of this pool is limited to be between UBI_FM_MIN_POOL_SIZE and
* UBI_FM_MAX_POOL_SIZE */
#define UBI_FM_MIN_POOL_SIZE 8
#define UBI_FM_MAX_POOL_SIZE 256
#define UBI_FM_WL_POOL_SIZE 25
/**
* struct ubi_fm_sb - UBI fastmap super block
* @magic: fastmap super block magic number (%UBI_FM_SB_MAGIC)
* @version: format version of this fastmap
* @data_crc: CRC over the fastmap data
* @used_blocks: number of PEBs used by this fastmap
* @block_loc: an array containing the location of all PEBs of the fastmap
* @block_ec: the erase counter of each used PEB
* @sqnum: highest sequence number value at the time while taking the fastmap
*
*/
struct ubi_fm_sb {
__be32 magic;
__u8 version;
__u8 padding1[3];
__be32 data_crc;
__be32 used_blocks;
__be32 block_loc[UBI_FM_MAX_BLOCKS];
__be32 block_ec[UBI_FM_MAX_BLOCKS];
__be64 sqnum;
__u8 padding2[32];
} __packed;
/**
* struct ubi_fm_hdr - header of the fastmap data set
* @magic: fastmap header magic number (%UBI_FM_HDR_MAGIC)
* @free_peb_count: number of free PEBs known by this fastmap
* @used_peb_count: number of used PEBs known by this fastmap
* @scrub_peb_count: number of to be scrubbed PEBs known by this fastmap
* @bad_peb_count: number of bad PEBs known by this fastmap
* @erase_peb_count: number of bad PEBs which have to be erased
* @vol_count: number of UBI volumes known by this fastmap
*/
struct ubi_fm_hdr {
__be32 magic;
__be32 free_peb_count;
__be32 used_peb_count;
__be32 scrub_peb_count;
__be32 bad_peb_count;
__be32 erase_peb_count;
__be32 vol_count;
__u8 padding[4];
} __packed;
/* struct ubi_fm_hdr is followed by two struct ubi_fm_scan_pool */
/**
* struct ubi_fm_scan_pool - Fastmap pool PEBs to be scanned while attaching
* @magic: pool magic numer (%UBI_FM_POOL_MAGIC)
* @size: current pool size
* @max_size: maximal pool size
* @pebs: an array containing the location of all PEBs in this pool
*/
struct ubi_fm_scan_pool {
__be32 magic;
__be16 size;
__be16 max_size;
__be32 pebs[UBI_FM_MAX_POOL_SIZE];
__be32 padding[4];
} __packed;
/* ubi_fm_scan_pool is followed by nfree+nused struct ubi_fm_ec records */
/**
* struct ubi_fm_ec - stores the erase counter of a PEB
* @pnum: PEB number
* @ec: ec of this PEB
*/
struct ubi_fm_ec {
__be32 pnum;
__be32 ec;
} __packed;
/**
* struct ubi_fm_volhdr - Fastmap volume header
* it identifies the start of an eba table
* @magic: Fastmap volume header magic number (%UBI_FM_VHDR_MAGIC)
* @vol_id: volume id of the fastmapped volume
* @vol_type: type of the fastmapped volume
* @data_pad: data_pad value of the fastmapped volume
* @used_ebs: number of used LEBs within this volume
* @last_eb_bytes: number of bytes used in the last LEB
*/
struct ubi_fm_volhdr {
__be32 magic;
__be32 vol_id;
__u8 vol_type;
__u8 padding1[3];
__be32 data_pad;
__be32 used_ebs;
__be32 last_eb_bytes;
__u8 padding2[8];
} __packed;
/* struct ubi_fm_volhdr is followed by one struct ubi_fm_eba records */
/**
* struct ubi_fm_eba - denotes an association beween a PEB and LEB
* @magic: EBA table magic number
* @reserved_pebs: number of table entries
* @pnum: PEB number of LEB (LEB is the index)
*/
struct ubi_fm_eba {
__be32 magic;
__be32 reserved_pebs;
__be32 pnum[0];
} __packed;
#endif /* !__UBI_MEDIA_H__ */
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