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Message-Id: <1337201522-86521-4-git-send-email-richard@nod.at>
Date: Wed, 16 May 2012 22:51:58 +0200
From: Richard Weinberger <richard@....at>
To: linux-mtd@...ts.infradead.org
Cc: tglx@...utronix.de, dedekind1@...il.com,
linux-kernel@...r.kernel.org, Heinz.Egger@...utronix.de,
tim.bird@...sony.com, Richard Weinberger <richard@....at>
Subject: [PATCH 3/7] [RFC] UBI: Add fastmap on-flash layout
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 <richard@....at>
---
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
--
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