Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759812Ab2EPUxY (ORCPT ); Wed, 16 May 2012 16:53:24 -0400 Received: from a.ns.miles-group.at ([95.130.255.143]:47837 "EHLO radon.swed.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756658Ab2EPUwO (ORCPT ); Wed, 16 May 2012 16:52:14 -0400 From: Richard Weinberger To: linux-mtd@lists.infradead.org Cc: tglx@linutronix.de, dedekind1@gmail.com, linux-kernel@vger.kernel.org, Heinz.Egger@linutronix.de, tim.bird@am.sony.com, Richard Weinberger Subject: [PATCH 3/7] [RFC] UBI: Add fastmap on-flash layout Date: Wed, 16 May 2012 22:51:58 +0200 Message-Id: <1337201522-86521-4-git-send-email-richard@nod.at> X-Mailer: git-send-email 1.7.6.5 In-Reply-To: <1337201522-86521-1-git-send-email-richard@nod.at> References: <1337201522-86521-1-git-send-email-richard@nod.at> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4499 Lines: 153 Specifies the fastmap on-flash layout. The fastmap on-flash data structure consists of two major parts. A super block (identified via UBI_FM_SB_VOLUME_ID) and zero or more data blocks (identified via UBI_Fm_DATA_VOLUME_ID). Data blocks are only used if whole checkpoint information does not fit into the super block. Signed-off-by: Richard Weinberger --- drivers/mtd/ubi/ubi-media.h | 124 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 124 insertions(+), 0 deletions(-) diff --git a/drivers/mtd/ubi/ubi-media.h b/drivers/mtd/ubi/ubi-media.h index 6fb8ec2..a23196f 100644 --- a/drivers/mtd/ubi/ubi-media.h +++ b/drivers/mtd/ubi/ubi-media.h @@ -375,4 +375,128 @@ 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 + +/* Semi-sane default values - TBR */ +#ifndef UBI_FM_MAX_POOL_SIZE +#define UBI_FM_MAX_POOL_SIZE 128 +#endif +#ifndef UBI_FM_MAX_BLOCKS +#define UBI_FM_MAX_BLOCKS 32 +#endif +#ifndef UBI_FM_MAX_START +#define UBI_FM_MAX_START 64 +#endif + +/** + * 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 + * @nblocks: 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 nblocks; + __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) + * @nfree: number of free PEBs known by this fastmap + * @nused: number of used PEBs known by this fastmap + * @nvol: number of UBI volumes known by this fastmap + */ +struct ubi_fm_hdr { + __be32 magic; + __be32 nfree; + __be32 nused; + __be32 nvol; + __u8 padding[16]; +} __packed; + +/* struct ubi_fm_hdr is followed by 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 + * @pebs: an array containing the location of all PEBs in this pool + */ +struct ubi_fm_scan_pool { + __be32 magic; + __be32 size; + __be32 pebs[UBI_FM_MAX_POOL_SIZE]; + __be32 padding[4]; +} __packed; + +/* struct 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 + * @nused: number of table entries + * @pnum: PEB number of LEB (LEB is the index) + */ +struct ubi_fm_eba { + __be32 magic; + __be32 nused; + __be32 pnum[0]; +} __packed; #endif /* !__UBI_MEDIA_H__ */ -- 1.7.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/