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503 lines
20 KiB
503 lines
20 KiB
/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */ |
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/* |
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* Copyright (C) International Business Machines Corp., 2006 |
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* Authors: Artem Bityutskiy (Битюцкий Артём) |
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* Thomas Gleixner |
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* Frank Haverkamp |
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* Oliver Lohmann |
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* Andreas Arnez |
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* |
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* This file defines the layout of UBI headers and all the other UBI on-flash |
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* data structures. |
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*/ |
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#ifndef __UBI_MEDIA_H__ |
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#define __UBI_MEDIA_H__ |
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|
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#include <asm/byteorder.h> |
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|
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/* The version of UBI images supported by this implementation */ |
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#define UBI_VERSION 1 |
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|
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/* The highest erase counter value supported by this implementation */ |
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#define UBI_MAX_ERASECOUNTER 0x7FFFFFFF |
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/* The initial CRC32 value used when calculating CRC checksums */ |
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#define UBI_CRC32_INIT 0xFFFFFFFFU |
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/* Erase counter header magic number (ASCII "UBI#") */ |
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#define UBI_EC_HDR_MAGIC 0x55424923 |
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/* Volume identifier header magic number (ASCII "UBI!") */ |
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#define UBI_VID_HDR_MAGIC 0x55424921 |
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/* |
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* Volume type constants used in the volume identifier header. |
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* |
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* @UBI_VID_DYNAMIC: dynamic volume |
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* @UBI_VID_STATIC: static volume |
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*/ |
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enum { |
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UBI_VID_DYNAMIC = 1, |
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UBI_VID_STATIC = 2 |
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}; |
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/* |
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* Volume flags used in the volume table record. |
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* |
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* @UBI_VTBL_AUTORESIZE_FLG: auto-resize this volume |
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* @UBI_VTBL_SKIP_CRC_CHECK_FLG: skip the CRC check done on a static volume at |
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* open time. Should only be set on volumes that |
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* are used by upper layers doing this kind of |
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* check. Main use-case for this flag is |
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* boot-time reduction |
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* |
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* %UBI_VTBL_AUTORESIZE_FLG flag can be set only for one volume in the volume |
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* table. UBI automatically re-sizes the volume which has this flag and makes |
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* the volume to be of largest possible size. This means that if after the |
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* initialization UBI finds out that there are available physical eraseblocks |
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* present on the device, it automatically appends all of them to the volume |
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* (the physical eraseblocks reserved for bad eraseblocks handling and other |
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* reserved physical eraseblocks are not taken). So, if there is a volume with |
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* the %UBI_VTBL_AUTORESIZE_FLG flag set, the amount of available logical |
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* eraseblocks will be zero after UBI is loaded, because all of them will be |
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* reserved for this volume. Note, the %UBI_VTBL_AUTORESIZE_FLG bit is cleared |
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* after the volume had been initialized. |
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* |
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* The auto-resize feature is useful for device production purposes. For |
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* example, different NAND flash chips may have different amount of initial bad |
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* eraseblocks, depending of particular chip instance. Manufacturers of NAND |
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* chips usually guarantee that the amount of initial bad eraseblocks does not |
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* exceed certain percent, e.g. 2%. When one creates an UBI image which will be |
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* flashed to the end devices in production, he does not know the exact amount |
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* of good physical eraseblocks the NAND chip on the device will have, but this |
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* number is required to calculate the volume sized and put them to the volume |
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* table of the UBI image. In this case, one of the volumes (e.g., the one |
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* which will store the root file system) is marked as "auto-resizable", and |
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* UBI will adjust its size on the first boot if needed. |
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* |
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* Note, first UBI reserves some amount of physical eraseblocks for bad |
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* eraseblock handling, and then re-sizes the volume, not vice-versa. This |
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* means that the pool of reserved physical eraseblocks will always be present. |
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*/ |
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enum { |
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UBI_VTBL_AUTORESIZE_FLG = 0x01, |
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UBI_VTBL_SKIP_CRC_CHECK_FLG = 0x02, |
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}; |
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/* |
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* Compatibility constants used by internal volumes. |
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* |
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* @UBI_COMPAT_DELETE: delete this internal volume before anything is written |
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* to the flash |
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* @UBI_COMPAT_RO: attach this device in read-only mode |
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* @UBI_COMPAT_PRESERVE: preserve this internal volume - do not touch its |
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* physical eraseblocks, don't allow the wear-leveling |
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* sub-system to move them |
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* @UBI_COMPAT_REJECT: reject this UBI image |
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*/ |
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enum { |
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UBI_COMPAT_DELETE = 1, |
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UBI_COMPAT_RO = 2, |
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UBI_COMPAT_PRESERVE = 4, |
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UBI_COMPAT_REJECT = 5 |
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}; |
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/* Sizes of UBI headers */ |
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#define UBI_EC_HDR_SIZE sizeof(struct ubi_ec_hdr) |
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#define UBI_VID_HDR_SIZE sizeof(struct ubi_vid_hdr) |
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/* Sizes of UBI headers without the ending CRC */ |
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#define UBI_EC_HDR_SIZE_CRC (UBI_EC_HDR_SIZE - sizeof(__be32)) |
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#define UBI_VID_HDR_SIZE_CRC (UBI_VID_HDR_SIZE - sizeof(__be32)) |
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/** |
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* struct ubi_ec_hdr - UBI erase counter header. |
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* @magic: erase counter header magic number (%UBI_EC_HDR_MAGIC) |
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* @version: version of UBI implementation which is supposed to accept this |
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* UBI image |
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* @padding1: reserved for future, zeroes |
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* @ec: the erase counter |
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* @vid_hdr_offset: where the VID header starts |
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* @data_offset: where the user data start |
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* @image_seq: image sequence number |
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* @padding2: reserved for future, zeroes |
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* @hdr_crc: erase counter header CRC checksum |
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* |
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* The erase counter header takes 64 bytes and has a plenty of unused space for |
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* future usage. The unused fields are zeroed. The @version field is used to |
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* indicate the version of UBI implementation which is supposed to be able to |
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* work with this UBI image. If @version is greater than the current UBI |
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* version, the image is rejected. This may be useful in future if something |
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* is changed radically. This field is duplicated in the volume identifier |
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* header. |
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* |
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* The @vid_hdr_offset and @data_offset fields contain the offset of the the |
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* volume identifier header and user data, relative to the beginning of the |
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* physical eraseblock. These values have to be the same for all physical |
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* eraseblocks. |
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* |
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* The @image_seq field is used to validate a UBI image that has been prepared |
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* for a UBI device. The @image_seq value can be any value, but it must be the |
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* same on all eraseblocks. UBI will ensure that all new erase counter headers |
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* also contain this value, and will check the value when attaching the flash. |
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* One way to make use of @image_seq is to increase its value by one every time |
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* an image is flashed over an existing image, then, if the flashing does not |
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* complete, UBI will detect the error when attaching the media. |
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*/ |
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struct ubi_ec_hdr { |
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__be32 magic; |
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__u8 version; |
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__u8 padding1[3]; |
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__be64 ec; /* Warning: the current limit is 31-bit anyway! */ |
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__be32 vid_hdr_offset; |
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__be32 data_offset; |
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__be32 image_seq; |
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__u8 padding2[32]; |
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__be32 hdr_crc; |
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} __packed; |
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/** |
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* struct ubi_vid_hdr - on-flash UBI volume identifier header. |
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* @magic: volume identifier header magic number (%UBI_VID_HDR_MAGIC) |
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* @version: UBI implementation version which is supposed to accept this UBI |
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* image (%UBI_VERSION) |
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* @vol_type: volume type (%UBI_VID_DYNAMIC or %UBI_VID_STATIC) |
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* @copy_flag: if this logical eraseblock was copied from another physical |
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* eraseblock (for wear-leveling reasons) |
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* @compat: compatibility of this volume (%0, %UBI_COMPAT_DELETE, |
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* %UBI_COMPAT_IGNORE, %UBI_COMPAT_PRESERVE, or %UBI_COMPAT_REJECT) |
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* @vol_id: ID of this volume |
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* @lnum: logical eraseblock number |
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* @padding1: reserved for future, zeroes |
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* @data_size: how many bytes of data this logical eraseblock contains |
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* @used_ebs: total number of used logical eraseblocks in this volume |
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* @data_pad: how many bytes at the end of this physical eraseblock are not |
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* used |
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* @data_crc: CRC checksum of the data stored in this logical eraseblock |
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* @padding2: reserved for future, zeroes |
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* @sqnum: sequence number |
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* @padding3: reserved for future, zeroes |
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* @hdr_crc: volume identifier header CRC checksum |
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* |
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* The @sqnum is the value of the global sequence counter at the time when this |
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* VID header was created. The global sequence counter is incremented each time |
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* UBI writes a new VID header to the flash, i.e. when it maps a logical |
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* eraseblock to a new physical eraseblock. The global sequence counter is an |
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* unsigned 64-bit integer and we assume it never overflows. The @sqnum |
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* (sequence number) is used to distinguish between older and newer versions of |
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* logical eraseblocks. |
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* |
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* There are 2 situations when there may be more than one physical eraseblock |
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* corresponding to the same logical eraseblock, i.e., having the same @vol_id |
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* and @lnum values in the volume identifier header. Suppose we have a logical |
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* eraseblock L and it is mapped to the physical eraseblock P. |
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* |
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* 1. Because UBI may erase physical eraseblocks asynchronously, the following |
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* situation is possible: L is asynchronously erased, so P is scheduled for |
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* erasure, then L is written to,i.e. mapped to another physical eraseblock P1, |
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* so P1 is written to, then an unclean reboot happens. Result - there are 2 |
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* physical eraseblocks P and P1 corresponding to the same logical eraseblock |
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* L. But P1 has greater sequence number, so UBI picks P1 when it attaches the |
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* flash. |
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* |
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* 2. From time to time UBI moves logical eraseblocks to other physical |
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* eraseblocks for wear-leveling reasons. If, for example, UBI moves L from P |
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* to P1, and an unclean reboot happens before P is physically erased, there |
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* are two physical eraseblocks P and P1 corresponding to L and UBI has to |
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* select one of them when the flash is attached. The @sqnum field says which |
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* PEB is the original (obviously P will have lower @sqnum) and the copy. But |
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* it is not enough to select the physical eraseblock with the higher sequence |
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* number, because the unclean reboot could have happen in the middle of the |
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* copying process, so the data in P is corrupted. It is also not enough to |
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* just select the physical eraseblock with lower sequence number, because the |
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* data there may be old (consider a case if more data was added to P1 after |
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* the copying). Moreover, the unclean reboot may happen when the erasure of P |
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* was just started, so it result in unstable P, which is "mostly" OK, but |
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* still has unstable bits. |
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* |
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* UBI uses the @copy_flag field to indicate that this logical eraseblock is a |
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* copy. UBI also calculates data CRC when the data is moved and stores it at |
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* the @data_crc field of the copy (P1). So when UBI needs to pick one physical |
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* eraseblock of two (P or P1), the @copy_flag of the newer one (P1) is |
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* examined. If it is cleared, the situation is simple and the newer one is |
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* picked. If it is set, the data CRC of the copy (P1) is examined. If the CRC |
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* checksum is correct, this physical eraseblock is selected (P1). Otherwise |
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* the older one (P) is selected. |
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* |
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* There are 2 sorts of volumes in UBI: user volumes and internal volumes. |
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* Internal volumes are not seen from outside and are used for various internal |
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* UBI purposes. In this implementation there is only one internal volume - the |
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* layout volume. Internal volumes are the main mechanism of UBI extensions. |
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* For example, in future one may introduce a journal internal volume. Internal |
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* volumes have their own reserved range of IDs. |
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* |
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* The @compat field is only used for internal volumes and contains the "degree |
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* of their compatibility". It is always zero for user volumes. This field |
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* provides a mechanism to introduce UBI extensions and to be still compatible |
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* with older UBI binaries. For example, if someone introduced a journal in |
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* future, he would probably use %UBI_COMPAT_DELETE compatibility for the |
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* journal volume. And in this case, older UBI binaries, which know nothing |
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* about the journal volume, would just delete this volume and work perfectly |
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* fine. This is similar to what Ext2fs does when it is fed by an Ext3fs image |
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* - it just ignores the Ext3fs journal. |
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* |
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* The @data_crc field contains the CRC checksum of the contents of the logical |
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* eraseblock if this is a static volume. In case of dynamic volumes, it does |
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* not contain the CRC checksum as a rule. The only exception is when the |
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* data of the physical eraseblock was moved by the wear-leveling sub-system, |
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* then the wear-leveling sub-system calculates the data CRC and stores it in |
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* the @data_crc field. And of course, the @copy_flag is %in this case. |
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* |
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* The @data_size field is used only for static volumes because UBI has to know |
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* how many bytes of data are stored in this eraseblock. For dynamic volumes, |
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* this field usually contains zero. The only exception is when the data of the |
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* physical eraseblock was moved to another physical eraseblock for |
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* wear-leveling reasons. In this case, UBI calculates CRC checksum of the |
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* contents and uses both @data_crc and @data_size fields. In this case, the |
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* @data_size field contains data size. |
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* |
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* The @used_ebs field is used only for static volumes and indicates how many |
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* eraseblocks the data of the volume takes. For dynamic volumes this field is |
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* not used and always contains zero. |
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* |
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* The @data_pad is calculated when volumes are created using the alignment |
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* parameter. So, effectively, the @data_pad field reduces the size of logical |
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* eraseblocks of this volume. This is very handy when one uses block-oriented |
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* software (say, cramfs) on top of the UBI volume. |
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*/ |
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struct ubi_vid_hdr { |
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__be32 magic; |
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__u8 version; |
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__u8 vol_type; |
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__u8 copy_flag; |
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__u8 compat; |
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__be32 vol_id; |
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__be32 lnum; |
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__u8 padding1[4]; |
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__be32 data_size; |
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__be32 used_ebs; |
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__be32 data_pad; |
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__be32 data_crc; |
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__u8 padding2[4]; |
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__be64 sqnum; |
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__u8 padding3[12]; |
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__be32 hdr_crc; |
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} __packed; |
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/* Internal UBI volumes count */ |
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#define UBI_INT_VOL_COUNT 1 |
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/* |
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* Starting ID of internal volumes: 0x7fffefff. |
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* There is reserved room for 4096 internal volumes. |
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*/ |
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#define UBI_INTERNAL_VOL_START (0x7FFFFFFF - 4096) |
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/* The layout volume contains the volume table */ |
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#define UBI_LAYOUT_VOLUME_ID UBI_INTERNAL_VOL_START |
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#define UBI_LAYOUT_VOLUME_TYPE UBI_VID_DYNAMIC |
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#define UBI_LAYOUT_VOLUME_ALIGN 1 |
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#define UBI_LAYOUT_VOLUME_EBS 2 |
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#define UBI_LAYOUT_VOLUME_NAME "layout volume" |
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#define UBI_LAYOUT_VOLUME_COMPAT UBI_COMPAT_REJECT |
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/* The maximum number of volumes per one UBI device */ |
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#define UBI_MAX_VOLUMES 128 |
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/* The maximum volume name length */ |
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#define UBI_VOL_NAME_MAX 127 |
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/* Size of the volume table record */ |
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#define UBI_VTBL_RECORD_SIZE sizeof(struct ubi_vtbl_record) |
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/* Size of the volume table record without the ending CRC */ |
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#define UBI_VTBL_RECORD_SIZE_CRC (UBI_VTBL_RECORD_SIZE - sizeof(__be32)) |
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/** |
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* struct ubi_vtbl_record - a record in the volume table. |
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* @reserved_pebs: how many physical eraseblocks are reserved for this volume |
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* @alignment: volume alignment |
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* @data_pad: how many bytes are unused at the end of the each physical |
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* eraseblock to satisfy the requested alignment |
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* @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME) |
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* @upd_marker: if volume update was started but not finished |
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* @name_len: volume name length |
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* @name: the volume name |
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* @flags: volume flags (%UBI_VTBL_AUTORESIZE_FLG) |
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* @padding: reserved, zeroes |
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* @crc: a CRC32 checksum of the record |
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* |
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* The volume table records are stored in the volume table, which is stored in |
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* the layout volume. The layout volume consists of 2 logical eraseblock, each |
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* of which contains a copy of the volume table (i.e., the volume table is |
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* duplicated). The volume table is an array of &struct ubi_vtbl_record |
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* objects indexed by the volume ID. |
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* |
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* If the size of the logical eraseblock is large enough to fit |
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* %UBI_MAX_VOLUMES records, the volume table contains %UBI_MAX_VOLUMES |
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* records. Otherwise, it contains as many records as it can fit (i.e., size of |
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* logical eraseblock divided by sizeof(struct ubi_vtbl_record)). |
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* |
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* The @upd_marker flag is used to implement volume update. It is set to %1 |
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* before update and set to %0 after the update. So if the update operation was |
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* interrupted, UBI knows that the volume is corrupted. |
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* |
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* The @alignment field is specified when the volume is created and cannot be |
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* later changed. It may be useful, for example, when a block-oriented file |
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* system works on top of UBI. The @data_pad field is calculated using the |
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* logical eraseblock size and @alignment. The alignment must be multiple to the |
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* minimal flash I/O unit. If @alignment is 1, all the available space of |
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* the physical eraseblocks is used. |
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* |
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* Empty records contain all zeroes and the CRC checksum of those zeroes. |
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*/ |
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struct ubi_vtbl_record { |
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__be32 reserved_pebs; |
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__be32 alignment; |
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__be32 data_pad; |
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__u8 vol_type; |
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__u8 upd_marker; |
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__be16 name_len; |
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__u8 name[UBI_VOL_NAME_MAX+1]; |
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__u8 flags; |
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__u8 padding[23]; |
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__be32 crc; |
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} __packed; |
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|
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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 super 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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|
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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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|
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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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|
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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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/** |
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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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|
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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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/** |
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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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|
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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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/** |
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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; |
|
|
|
/** |
|
* 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 between 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[]; |
|
} __packed; |
|
#endif /* !__UBI_MEDIA_H__ */
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