UBI: Add fastmap on-flash data structures
Add the on-flash data structures neeed by fastmap to ubi-media.h Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
This commit is contained in:
Richard Weinberger
Artem Bityutskiy
parent
55393ba1bd
commit
1c86574999
1 changed files with 137 additions and 0 deletions
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@ -375,4 +375,141 @@ struct ubi_vtbl_record {
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__be32 crc;
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} __packed;
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/* UBI fastmap on-flash data structures */
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#define UBI_FM_SB_VOLUME_ID (UBI_LAYOUT_VOLUME_ID + 1)
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#define UBI_FM_DATA_VOLUME_ID (UBI_LAYOUT_VOLUME_ID + 2)
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/* fastmap on-flash data structure format version */
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#define UBI_FM_FMT_VERSION 1
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#define UBI_FM_SB_MAGIC 0x7B11D69F
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#define UBI_FM_HDR_MAGIC 0xD4B82EF7
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#define UBI_FM_VHDR_MAGIC 0xFA370ED1
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#define UBI_FM_POOL_MAGIC 0x67AF4D08
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#define UBI_FM_EBA_MAGIC 0xf0c040a8
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/* A fastmap supber block can be located between PEB 0 and
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* UBI_FM_MAX_START */
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#define UBI_FM_MAX_START 64
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/* A fastmap can use up to UBI_FM_MAX_BLOCKS PEBs */
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#define UBI_FM_MAX_BLOCKS 32
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/* 5% of the total number of PEBs have to be scanned while attaching
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* from a fastmap.
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* But the size of this pool is limited to be between UBI_FM_MIN_POOL_SIZE and
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* UBI_FM_MAX_POOL_SIZE */
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#define UBI_FM_MIN_POOL_SIZE 8
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#define UBI_FM_MAX_POOL_SIZE 256
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#define UBI_FM_WL_POOL_SIZE 25
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/**
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* struct ubi_fm_sb - UBI fastmap super block
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* @magic: fastmap super block magic number (%UBI_FM_SB_MAGIC)
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* @version: format version of this fastmap
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* @data_crc: CRC over the fastmap data
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* @used_blocks: number of PEBs used by this fastmap
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* @block_loc: an array containing the location of all PEBs of the fastmap
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* @block_ec: the erase counter of each used PEB
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* @sqnum: highest sequence number value at the time while taking the fastmap
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*
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*/
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struct ubi_fm_sb {
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__be32 magic;
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__u8 version;
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__u8 padding1[3];
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__be32 data_crc;
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__be32 used_blocks;
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__be32 block_loc[UBI_FM_MAX_BLOCKS];
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__be32 block_ec[UBI_FM_MAX_BLOCKS];
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__be64 sqnum;
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__u8 padding2[32];
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} __packed;
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/**
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* struct ubi_fm_hdr - header of the fastmap data set
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* @magic: fastmap header magic number (%UBI_FM_HDR_MAGIC)
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* @free_peb_count: number of free PEBs known by this fastmap
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* @used_peb_count: number of used PEBs known by this fastmap
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* @scrub_peb_count: number of to be scrubbed PEBs known by this fastmap
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* @bad_peb_count: number of bad PEBs known by this fastmap
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* @erase_peb_count: number of bad PEBs which have to be erased
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* @vol_count: number of UBI volumes known by this fastmap
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*/
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struct ubi_fm_hdr {
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__be32 magic;
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__be32 free_peb_count;
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__be32 used_peb_count;
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__be32 scrub_peb_count;
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__be32 bad_peb_count;
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__be32 erase_peb_count;
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__be32 vol_count;
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__u8 padding[4];
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} __packed;
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/* struct ubi_fm_hdr is followed by two struct ubi_fm_scan_pool */
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/**
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* struct ubi_fm_scan_pool - Fastmap pool PEBs to be scanned while attaching
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* @magic: pool magic numer (%UBI_FM_POOL_MAGIC)
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* @size: current pool size
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* @max_size: maximal pool size
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* @pebs: an array containing the location of all PEBs in this pool
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*/
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struct ubi_fm_scan_pool {
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__be32 magic;
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__be16 size;
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__be16 max_size;
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__be32 pebs[UBI_FM_MAX_POOL_SIZE];
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__be32 padding[4];
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} __packed;
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/* ubi_fm_scan_pool is followed by nfree+nused struct ubi_fm_ec records */
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/**
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* struct ubi_fm_ec - stores the erase counter of a PEB
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* @pnum: PEB number
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* @ec: ec of this PEB
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*/
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struct ubi_fm_ec {
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__be32 pnum;
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__be32 ec;
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} __packed;
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/**
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* struct ubi_fm_volhdr - Fastmap volume header
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* it identifies the start of an eba table
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* @magic: Fastmap volume header magic number (%UBI_FM_VHDR_MAGIC)
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* @vol_id: volume id of the fastmapped volume
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* @vol_type: type of the fastmapped volume
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* @data_pad: data_pad value of the fastmapped volume
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* @used_ebs: number of used LEBs within this volume
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* @last_eb_bytes: number of bytes used in the last LEB
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*/
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struct ubi_fm_volhdr {
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__be32 magic;
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__be32 vol_id;
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__u8 vol_type;
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__u8 padding1[3];
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__be32 data_pad;
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__be32 used_ebs;
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__be32 last_eb_bytes;
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__u8 padding2[8];
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} __packed;
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/* struct ubi_fm_volhdr is followed by one struct ubi_fm_eba records */
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/**
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* struct ubi_fm_eba - denotes an association beween a PEB and LEB
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* @magic: EBA table magic number
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* @reserved_pebs: number of table entries
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* @pnum: PEB number of LEB (LEB is the index)
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*/
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struct ubi_fm_eba {
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__be32 magic;
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__be32 reserved_pebs;
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__be32 pnum[0];
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} __packed;
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#endif /* !__UBI_MEDIA_H__ */
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