+++ /dev/null
-/*
- * Copyright (c) International Business Machines Corp., 2006
- * Copyright (c) 2006-2017 The strace developers.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
- * the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Author: Artem Bityutskiy (Битюцкий Артём)
- */
-
-#ifndef __UBI_USER_H__
-#define __UBI_USER_H__
-
-#include <linux/types.h>
-
-/*
- * UBI device creation (the same as MTD device attachment)
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * MTD devices may be attached using %UBI_IOCATT ioctl command of the UBI
- * control device. The caller has to properly fill and pass
- * &struct ubi_attach_req object - UBI will attach the MTD device specified in
- * the request and return the newly created UBI device number as the ioctl
- * return value.
- *
- * UBI device deletion (the same as MTD device detachment)
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * An UBI device maybe deleted with %UBI_IOCDET ioctl command of the UBI
- * control device.
- *
- * UBI volume creation
- * ~~~~~~~~~~~~~~~~~~~
- *
- * UBI volumes are created via the %UBI_IOCMKVOL ioctl command of UBI character
- * device. A &struct ubi_mkvol_req object has to be properly filled and a
- * pointer to it has to be passed to the ioctl.
- *
- * UBI volume deletion
- * ~~~~~~~~~~~~~~~~~~~
- *
- * To delete a volume, the %UBI_IOCRMVOL ioctl command of the UBI character
- * device should be used. A pointer to the 32-bit volume ID hast to be passed
- * to the ioctl.
- *
- * UBI volume re-size
- * ~~~~~~~~~~~~~~~~~~
- *
- * To re-size a volume, the %UBI_IOCRSVOL ioctl command of the UBI character
- * device should be used. A &struct ubi_rsvol_req object has to be properly
- * filled and a pointer to it has to be passed to the ioctl.
- *
- * UBI volumes re-name
- * ~~~~~~~~~~~~~~~~~~~
- *
- * To re-name several volumes atomically at one go, the %UBI_IOCRNVOL command
- * of the UBI character device should be used. A &struct ubi_rnvol_req object
- * has to be properly filled and a pointer to it has to be passed to the ioctl.
- *
- * UBI volume update
- * ~~~~~~~~~~~~~~~~~
- *
- * Volume update should be done via the %UBI_IOCVOLUP ioctl command of the
- * corresponding UBI volume character device. A pointer to a 64-bit update
- * size should be passed to the ioctl. After this, UBI expects user to write
- * this number of bytes to the volume character device. The update is finished
- * when the claimed number of bytes is passed. So, the volume update sequence
- * is something like:
- *
- * fd = open("/dev/my_volume");
- * ioctl(fd, UBI_IOCVOLUP, &image_size);
- * write(fd, buf, image_size);
- * close(fd);
- *
- * Logical eraseblock erase
- * ~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * To erase a logical eraseblock, the %UBI_IOCEBER ioctl command of the
- * corresponding UBI volume character device should be used. This command
- * unmaps the requested logical eraseblock, makes sure the corresponding
- * physical eraseblock is successfully erased, and returns.
- *
- * Atomic logical eraseblock change
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * Atomic logical eraseblock change operation is called using the %UBI_IOCEBCH
- * ioctl command of the corresponding UBI volume character device. A pointer to
- * a &struct ubi_leb_change_req object has to be passed to the ioctl. Then the
- * user is expected to write the requested amount of bytes (similarly to what
- * should be done in case of the "volume update" ioctl).
- *
- * Logical eraseblock map
- * ~~~~~~~~~~~~~~~~~~~~~
- *
- * To map a logical eraseblock to a physical eraseblock, the %UBI_IOCEBMAP
- * ioctl command should be used. A pointer to a &struct ubi_map_req object is
- * expected to be passed. The ioctl maps the requested logical eraseblock to
- * a physical eraseblock and returns. Only non-mapped logical eraseblocks can
- * be mapped. If the logical eraseblock specified in the request is already
- * mapped to a physical eraseblock, the ioctl fails and returns error.
- *
- * Logical eraseblock unmap
- * ~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * To unmap a logical eraseblock to a physical eraseblock, the %UBI_IOCEBUNMAP
- * ioctl command should be used. The ioctl unmaps the logical eraseblocks,
- * schedules corresponding physical eraseblock for erasure, and returns. Unlike
- * the "LEB erase" command, it does not wait for the physical eraseblock being
- * erased. Note, the side effect of this is that if an unclean reboot happens
- * after the unmap ioctl returns, you may find the LEB mapped again to the same
- * physical eraseblock after the UBI is run again.
- *
- * Check if logical eraseblock is mapped
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * To check if a logical eraseblock is mapped to a physical eraseblock, the
- * %UBI_IOCEBISMAP ioctl command should be used. It returns %0 if the LEB is
- * not mapped, and %1 if it is mapped.
- *
- * Set an UBI volume property
- * ~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * To set an UBI volume property the %UBI_IOCSETPROP ioctl command should be
- * used. A pointer to a &struct ubi_set_vol_prop_req object is expected to be
- * passed. The object describes which property should be set, and to which value
- * it should be set.
- */
-
-/*
- * When a new UBI volume or UBI device is created, users may either specify the
- * volume/device number they want to create or to let UBI automatically assign
- * the number using these constants.
- */
-#define UBI_VOL_NUM_AUTO (-1)
-#define UBI_DEV_NUM_AUTO (-1)
-
-/* Maximum volume name length */
-#define UBI_MAX_VOLUME_NAME 127
-
-/* ioctl commands of UBI character devices */
-
-#define UBI_IOC_MAGIC 'o'
-
-/* Create an UBI volume */
-#define UBI_IOCMKVOL _IOW(UBI_IOC_MAGIC, 0, struct ubi_mkvol_req)
-/* Remove an UBI volume */
-#define UBI_IOCRMVOL _IOW(UBI_IOC_MAGIC, 1, __s32)
-/* Re-size an UBI volume */
-#define UBI_IOCRSVOL _IOW(UBI_IOC_MAGIC, 2, struct ubi_rsvol_req)
-/* Re-name volumes */
-#define UBI_IOCRNVOL _IOW(UBI_IOC_MAGIC, 3, struct ubi_rnvol_req)
-
-/* ioctl commands of the UBI control character device */
-
-#define UBI_CTRL_IOC_MAGIC 'o'
-
-/* Attach an MTD device */
-#define UBI_IOCATT _IOW(UBI_CTRL_IOC_MAGIC, 64, struct ubi_attach_req)
-/* Detach an MTD device */
-#define UBI_IOCDET _IOW(UBI_CTRL_IOC_MAGIC, 65, __s32)
-
-/* ioctl commands of UBI volume character devices */
-
-#define UBI_VOL_IOC_MAGIC 'O'
-
-/* Start UBI volume update */
-#define UBI_IOCVOLUP _IOW(UBI_VOL_IOC_MAGIC, 0, __s64)
-/* LEB erasure command, used for debugging, disabled by default */
-#define UBI_IOCEBER _IOW(UBI_VOL_IOC_MAGIC, 1, __s32)
-/* Atomic LEB change command */
-#define UBI_IOCEBCH _IOW(UBI_VOL_IOC_MAGIC, 2, __s32)
-/* Map LEB command */
-#define UBI_IOCEBMAP _IOW(UBI_VOL_IOC_MAGIC, 3, struct ubi_map_req)
-/* Unmap LEB command */
-#define UBI_IOCEBUNMAP _IOW(UBI_VOL_IOC_MAGIC, 4, __s32)
-/* Check if LEB is mapped command */
-#define UBI_IOCEBISMAP _IOR(UBI_VOL_IOC_MAGIC, 5, __s32)
-/* Set an UBI volume property */
-#define UBI_IOCSETVOLPROP _IOW(UBI_VOL_IOC_MAGIC, 6, \
- struct ubi_set_vol_prop_req)
-
-/* Maximum MTD device name length supported by UBI */
-#define MAX_UBI_MTD_NAME_LEN 127
-
-/* Maximum amount of UBI volumes that can be re-named at one go */
-#define UBI_MAX_RNVOL 32
-
-/*
- * UBI volume type constants.
- *
- * @UBI_DYNAMIC_VOLUME: dynamic volume
- * @UBI_STATIC_VOLUME: static volume
- */
-enum {
- UBI_DYNAMIC_VOLUME = 3,
- UBI_STATIC_VOLUME = 4,
-};
-
-/*
- * UBI set volume property ioctl constants.
- *
- * @UBI_VOL_PROP_DIRECT_WRITE: allow (any non-zero value) or disallow (value 0)
- * user to directly write and erase individual
- * eraseblocks on dynamic volumes
- */
-enum {
- UBI_VOL_PROP_DIRECT_WRITE = 1,
-};
-
-/**
- * struct ubi_attach_req - attach MTD device request.
- * @ubi_num: UBI device number to create
- * @mtd_num: MTD device number to attach
- * @vid_hdr_offset: VID header offset (use defaults if %0)
- * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
- * @padding: reserved for future, not used, has to be zeroed
- *
- * This data structure is used to specify MTD device UBI has to attach and the
- * parameters it has to use. The number which should be assigned to the new UBI
- * device is passed in @ubi_num. UBI may automatically assign the number if
- * @UBI_DEV_NUM_AUTO is passed. In this case, the device number is returned in
- * @ubi_num.
- *
- * Most applications should pass %0 in @vid_hdr_offset to make UBI use default
- * offset of the VID header within physical eraseblocks. The default offset is
- * the next min. I/O unit after the EC header. For example, it will be offset
- * 512 in case of a 512 bytes page NAND flash with no sub-page support. Or
- * it will be 512 in case of a 2KiB page NAND flash with 4 512-byte sub-pages.
- *
- * But in rare cases, if this optimizes things, the VID header may be placed to
- * a different offset. For example, the boot-loader might do things faster if
- * the VID header sits at the end of the first 2KiB NAND page with 4 sub-pages.
- * As the boot-loader would not normally need to read EC headers (unless it
- * needs UBI in RW mode), it might be faster to calculate ECC. This is weird
- * example, but it real-life example. So, in this example, @vid_hdr_offer would
- * be 2KiB-64 bytes = 1984. Note, that this position is not even 512-bytes
- * aligned, which is OK, as UBI is clever enough to realize this is 4th
- * sub-page of the first page and add needed padding.
- *
- * The @max_beb_per1024 is the maximum amount of bad PEBs UBI expects on the
- * UBI device per 1024 eraseblocks. This value is often given in an other form
- * in the NAND datasheet (min NVB i.e. minimal number of valid blocks). The
- * maximum expected bad eraseblocks per 1024 is then:
- * 1024 * (1 - MinNVB / MaxNVB)
- * Which gives 20 for most NAND devices. This limit is used in order to derive
- * amount of eraseblock UBI reserves for handling new bad blocks. If the device
- * has more bad eraseblocks than this limit, UBI does not reserve any physical
- * eraseblocks for new bad eraseblocks, but attempts to use available
- * eraseblocks (if any). The accepted range is 0-768. If 0 is given, the
- * default kernel value of %CONFIG_MTD_UBI_BEB_LIMIT will be used.
- */
-struct ubi_attach_req {
- __s32 ubi_num;
- __s32 mtd_num;
- __s32 vid_hdr_offset;
- __s16 max_beb_per1024;
- __s8 padding[10];
-};
-
-/**
- * struct ubi_mkvol_req - volume description data structure used in
- * volume creation requests.
- * @vol_id: volume number
- * @alignment: volume alignment
- * @bytes: volume size in bytes
- * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME)
- * @padding1: reserved for future, not used, has to be zeroed
- * @name_len: volume name length
- * @padding2: reserved for future, not used, has to be zeroed
- * @name: volume name
- *
- * This structure is used by user-space programs when creating new volumes. The
- * @used_bytes field is only necessary when creating static volumes.
- *
- * The @alignment field specifies the required alignment of the volume logical
- * eraseblock. This means, that the size of logical eraseblocks will be aligned
- * to this number, i.e.,
- * (UBI device logical eraseblock size) mod (@alignment) = 0.
- *
- * To put it differently, the logical eraseblock of this volume may be slightly
- * shortened in order to make it properly aligned. The alignment has to be
- * multiple of the flash minimal input/output unit, or %1 to utilize the entire
- * available space of logical eraseblocks.
- *
- * The @alignment field may be useful, for example, when one wants to maintain
- * a block device on top of an UBI volume. In this case, it is desirable to fit
- * an integer number of blocks in logical eraseblocks of this UBI volume. With
- * alignment it is possible to update this volume using plane UBI volume image
- * BLOBs, without caring about how to properly align them.
- */
-struct ubi_mkvol_req {
- __s32 vol_id;
- __s32 alignment;
- __s64 bytes;
- __s8 vol_type;
- __s8 padding1;
- __s16 name_len;
- __s8 padding2[4];
- char name[UBI_MAX_VOLUME_NAME + 1];
-} ATTRIBUTE_PACKED;
-
-/**
- * struct ubi_rsvol_req - a data structure used in volume re-size requests.
- * @vol_id: ID of the volume to re-size
- * @bytes: new size of the volume in bytes
- *
- * Re-sizing is possible for both dynamic and static volumes. But while dynamic
- * volumes may be re-sized arbitrarily, static volumes cannot be made to be
- * smaller than the number of bytes they bear. To arbitrarily shrink a static
- * volume, it must be wiped out first (by means of volume update operation with
- * zero number of bytes).
- */
-struct ubi_rsvol_req {
- __s64 bytes;
- __s32 vol_id;
-} ATTRIBUTE_PACKED;
-
-/**
- * struct ubi_rnvol_req - volumes re-name request.
- * @count: count of volumes to re-name
- * @padding1: reserved for future, not used, has to be zeroed
- * @vol_id: ID of the volume to re-name
- * @name_len: name length
- * @padding2: reserved for future, not used, has to be zeroed
- * @name: new volume name
- *
- * UBI allows to re-name up to %32 volumes at one go. The count of volumes to
- * re-name is specified in the @count field. The ID of the volumes to re-name
- * and the new names are specified in the @vol_id and @name fields.
- *
- * The UBI volume re-name operation is atomic, which means that should power cut
- * happen, the volumes will have either old name or new name. So the possible
- * use-cases of this command is atomic upgrade. Indeed, to upgrade, say, volumes
- * A and B one may create temporary volumes %A1 and %B1 with the new contents,
- * then atomically re-name A1->A and B1->B, in which case old %A and %B will
- * be removed.
- *
- * If it is not desirable to remove old A and B, the re-name request has to
- * contain 4 entries: A1->A, A->A1, B1->B, B->B1, in which case old A1 and B1
- * become A and B, and old A and B will become A1 and B1.
- *
- * It is also OK to request: A1->A, A1->X, B1->B, B->Y, in which case old A1
- * and B1 become A and B, and old A and B become X and Y.
- *
- * In other words, in case of re-naming into an existing volume name, the
- * existing volume is removed, unless it is re-named as well at the same
- * re-name request.
- */
-struct ubi_rnvol_req {
- __s32 count;
- __s8 padding1[12];
- struct {
- __s32 vol_id;
- __s16 name_len;
- __s8 padding2[2];
- char name[UBI_MAX_VOLUME_NAME + 1];
- } ents[UBI_MAX_RNVOL];
-} ATTRIBUTE_PACKED;
-
-/**
- * struct ubi_leb_change_req - a data structure used in atomic LEB change
- * requests.
- * @lnum: logical eraseblock number to change
- * @bytes: how many bytes will be written to the logical eraseblock
- * @dtype: pass "3" for better compatibility with old kernels
- * @padding: reserved for future, not used, has to be zeroed
- *
- * The @dtype field used to inform UBI about what kind of data will be written
- * to the LEB: long term (value 1), short term (value 2), unknown (value 3).
- * UBI tried to pick a PEB with lower erase counter for short term data and a
- * PEB with higher erase counter for long term data. But this was not really
- * used because users usually do not know this and could easily mislead UBI. We
- * removed this feature in May 2012. UBI currently just ignores the @dtype
- * field. But for better compatibility with older kernels it is recommended to
- * set @dtype to 3 (unknown).
- */
-struct ubi_leb_change_req {
- __s32 lnum;
- __s32 bytes;
- __s8 dtype; /* obsolete, do not use! */
- __s8 padding[7];
-} ATTRIBUTE_PACKED;
-
-/**
- * struct ubi_map_req - a data structure used in map LEB requests.
- * @dtype: pass "3" for better compatibility with old kernels
- * @lnum: logical eraseblock number to unmap
- * @padding: reserved for future, not used, has to be zeroed
- */
-struct ubi_map_req {
- __s32 lnum;
- __s8 dtype; /* obsolete, do not use! */
- __s8 padding[3];
-} ATTRIBUTE_PACKED;
-
-
-/**
- * struct ubi_set_vol_prop_req - a data structure used to set an UBI volume
- * property.
- * @property: property to set (%UBI_VOL_PROP_DIRECT_WRITE)
- * @padding: reserved for future, not used, has to be zeroed
- * @value: value to set
- */
-struct ubi_set_vol_prop_req {
- __u8 property;
- __u8 padding[7];
- __u64 value;
-} ATTRIBUTE_PACKED;
-
-#endif /* __UBI_USER_H__ */
projects / strace / commitdiff