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📄 inftl-user.h /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / / * Parts of INFTL headers shared with userspace * / #ifndef __MTD_INFTL_USER_H__ #define __MTD_INFTL_USER_H__ #include <linux/types.h> #define OSAK_VERSION 0x5120 #define PERCENTUSED 98 #define SECTORSIZE 512 / Block Control Information / struct inftl_bci { __u8 ECCsig[6]; __u8 Status; __u8 Status1; } __attribute__((packed)); struct inftl_unithead1 { __u16 virtualUnitNo; __u16 prevUnitNo; __u8 ANAC; __u8 NACs; __u8 parityPerField; __u8 discarded; } __attribute__((packed)); struct inftl_unithead2 { __u8 parityPerField; __u8 ANAC; __u16 prevUnitNo; __u16 virtualUnitNo; __u8 NACs; __u8 discarded; } __attribute__((packed)); struct inftl_unittail { __u8 Reserved[4]; __u16 EraseMark; __u16 EraseMark1; } __attribute__((packed)); union inftl_uci { struct inftl_unithead1 a; struct inftl_unithead2 b; struct inftl_unittail c; }; struct inftl_oob { struct inftl_bci b; union inftl_uci u; }; / INFTL Media Header / struct INFTLPartition { __u32 virtualUnits; __u32 firstUnit; __u32 lastUnit; __u32 flags; __u32 spareUnits; __u32 Reserved0; __u32 Reserved1; } __attribute__((packed)); struct INFTLMediaHeader { char bootRecordID[8]; __u32 NoOfBootImageBlocks; __u32 NoOfBinaryPartitions; __u32 NoOfBDTLPartitions; __u32 BlockMultiplierBits; __u32 FormatFlags; __u32 OsakVersion; __u32 PercentUsed; struct INFTLPartition Partitions[4]; } __attribute__((packed)); / Partition flag types / #define INFTL_BINARY 0x20000000 #define INFTL_BDTL 0x40000000 #define INFTL_LAST 0x80000000 #endif / __MTD_INFTL_USER_H__ */	1.61 KB	2026-03-24 10:01
📄 mtd-abi.h /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note / / * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al. * * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * / #ifndef __MTD_ABI_H__ #define __MTD_ABI_H__ #include <linux/types.h> struct erase_info_user { __u32 start; __u32 length; }; struct erase_info_user64 { __u64 start; __u64 length; }; struct mtd_oob_buf { __u32 start; __u32 length; unsigned char ptr; }; struct mtd_oob_buf64 { __u64 start; __u32 pad; __u32 length; __u64 usr_ptr; }; /** * MTD operation modes * * @MTD_OPS_PLACE_OOB: OOB data are placed at the given offset (default) * @MTD_OPS_AUTO_OOB: OOB data are automatically placed at the free areas * which are defined by the internal ecclayout * @MTD_OPS_RAW: data are transferred as-is, with no error correction; * this mode implies %MTD_OPS_PLACE_OOB * * These modes can be passed to ioctl(MEMWRITE) and are also used internally. * See notes on "MTD file modes" for discussion on %MTD_OPS_RAW vs. * %MTD_FILE_MODE_RAW. / enum { MTD_OPS_PLACE_OOB = 0, MTD_OPS_AUTO_OOB = 1, MTD_OPS_RAW = 2, }; /* * struct mtd_write_req - data structure for requesting a write operation * * @start: start address * @len: length of data buffer * @ooblen: length of OOB buffer * @usr_data: user-provided data buffer * @usr_oob: user-provided OOB buffer * @mode: MTD mode (see "MTD operation modes") * @padding: reserved, must be set to 0 * * This structure supports ioctl(MEMWRITE) operations, allowing data and/or OOB * writes in various modes. To write to OOB-only, set @usr_data == NULL, and to * write data-only, set @usr_oob == NULL. However, setting both @usr_data and * @usr_oob to NULL is not allowed. / struct mtd_write_req { __u64 start; __u64 len; __u64 ooblen; __u64 usr_data; __u64 usr_oob; __u8 mode; __u8 padding[7]; }; #define MTD_ABSENT 0 #define MTD_RAM 1 #define MTD_ROM 2 #define MTD_NORFLASH 3 #define MTD_NANDFLASH 4 / SLC NAND / #define MTD_DATAFLASH 6 #define MTD_UBIVOLUME 7 #define MTD_MLCNANDFLASH 8 / MLC NAND (including TLC) / #define MTD_WRITEABLE 0x400 / Device is writeable / #define MTD_BIT_WRITEABLE 0x800 / Single bits can be flipped / #define MTD_NO_ERASE 0x1000 / No erase necessary / #define MTD_POWERUP_LOCK 0x2000 / Always locked after reset / #define MTD_SLC_ON_MLC_EMULATION 0x4000 / Emulate SLC behavior on MLC NANDs / / Some common devices / combinations of capabilities / #define MTD_CAP_ROM 0 #define MTD_CAP_RAM (MTD_WRITEABLE \| MTD_BIT_WRITEABLE \| MTD_NO_ERASE) #define MTD_CAP_NORFLASH (MTD_WRITEABLE \| MTD_BIT_WRITEABLE) #define MTD_CAP_NANDFLASH (MTD_WRITEABLE) #define MTD_CAP_NVRAM (MTD_WRITEABLE \| MTD_BIT_WRITEABLE \| MTD_NO_ERASE) / Obsolete ECC byte placement modes (used with obsolete MEMGETOOBSEL) / #define MTD_NANDECC_OFF 0 / Switch off ECC (Not recommended) / #define MTD_NANDECC_PLACE 1 / Use the given placement in the structure (YAFFS1 legacy mode) / #define MTD_NANDECC_AUTOPLACE 2 / Use the default placement scheme / #define MTD_NANDECC_PLACEONLY 3 / Use the given placement in the structure (Do not store ecc result on read) / #define MTD_NANDECC_AUTOPL_USR 4 / Use the given autoplacement scheme rather than using the default / / OTP mode selection / #define MTD_OTP_OFF 0 #define MTD_OTP_FACTORY 1 #define MTD_OTP_USER 2 struct mtd_info_user { __u8 type; __u32 flags; __u32 size; / Total size of the MTD / __u32 erasesize; __u32 writesize; __u32 oobsize; / Amount of OOB data per block (e.g. 16) / __u64 padding; / Old obsolete field; do not use / }; struct region_info_user { __u32 offset; / At which this region starts, * from the beginning of the MTD / __u32 erasesize; / For this region / __u32 numblocks; / Number of blocks in this region / __u32 regionindex; }; struct otp_info { __u32 start; __u32 length; __u32 locked; }; / * Note, the following ioctl existed in the past and was removed: * #define MEMSETOOBSEL _IOW('M', 9, struct nand_oobinfo) * Try to avoid adding a new ioctl with the same ioctl number. / / Get basic MTD characteristics info (better to use sysfs) / #define MEMGETINFO _IOR('M', 1, struct mtd_info_user) / Erase segment of MTD / #define MEMERASE _IOW('M', 2, struct erase_info_user) / Write out-of-band data from MTD / #define MEMWRITEOOB _IOWR('M', 3, struct mtd_oob_buf) / Read out-of-band data from MTD / #define MEMREADOOB _IOWR('M', 4, struct mtd_oob_buf) / Lock a chip (for MTD that supports it) / #define MEMLOCK _IOW('M', 5, struct erase_info_user) / Unlock a chip (for MTD that supports it) / #define MEMUNLOCK _IOW('M', 6, struct erase_info_user) / Get the number of different erase regions / #define MEMGETREGIONCOUNT _IOR('M', 7, int) / Get information about the erase region for a specific index / #define MEMGETREGIONINFO _IOWR('M', 8, struct region_info_user) / Get info about OOB modes (e.g., RAW, PLACE, AUTO) - legacy interface / #define MEMGETOOBSEL _IOR('M', 10, struct nand_oobinfo) / Check if an eraseblock is bad / #define MEMGETBADBLOCK _IOW('M', 11, __kernel_loff_t) / Mark an eraseblock as bad / #define MEMSETBADBLOCK _IOW('M', 12, __kernel_loff_t) / Set OTP (One-Time Programmable) mode (factory vs. user) / #define OTPSELECT _IOR('M', 13, int) / Get number of OTP (One-Time Programmable) regions / #define OTPGETREGIONCOUNT _IOW('M', 14, int) / Get all OTP (One-Time Programmable) info about MTD / #define OTPGETREGIONINFO _IOW('M', 15, struct otp_info) / Lock a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) / #define OTPLOCK _IOR('M', 16, struct otp_info) / Get ECC layout (deprecated) / #define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout_user) / Get statistics about corrected/uncorrected errors / #define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats) / Set MTD mode on a per-file-descriptor basis (see "MTD file modes") / #define MTDFILEMODE _IO('M', 19) / Erase segment of MTD (supports 64-bit address) / #define MEMERASE64 _IOW('M', 20, struct erase_info_user64) / Write data to OOB (64-bit version) / #define MEMWRITEOOB64 _IOWR('M', 21, struct mtd_oob_buf64) / Read data from OOB (64-bit version) / #define MEMREADOOB64 _IOWR('M', 22, struct mtd_oob_buf64) / Check if chip is locked (for MTD that supports it) / #define MEMISLOCKED _IOR('M', 23, struct erase_info_user) / * Most generic write interface; can write in-band and/or out-of-band in various * modes (see "struct mtd_write_req"). This ioctl is not supported for flashes * without OOB, e.g., NOR flash. / #define MEMWRITE _IOWR('M', 24, struct mtd_write_req) / Erase a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) / #define OTPERASE _IOW('M', 25, struct otp_info) / * Obsolete legacy interface. Keep it in order not to break userspace * interfaces / struct nand_oobinfo { __u32 useecc; __u32 eccbytes; __u32 oobfree[8][2]; __u32 eccpos[32]; }; struct nand_oobfree { __u32 offset; __u32 length; }; #define MTD_MAX_OOBFREE_ENTRIES 8 #define MTD_MAX_ECCPOS_ENTRIES 64 / * OBSOLETE: ECC layout control structure. Exported to user-space via ioctl * ECCGETLAYOUT for backwards compatbility and should not be mistaken as a * complete set of ECC information. The ioctl truncates the larger internal * structure to retain binary compatibility with the static declaration of the * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of * the user struct, not the MAX size of the internal OOB layout representation. / struct nand_ecclayout_user { __u32 eccbytes; __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES]; __u32 oobavail; struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES]; }; /* * struct mtd_ecc_stats - error correction stats * * @corrected: number of corrected bits * @failed: number of uncorrectable errors * @badblocks: number of bad blocks in this partition * @bbtblocks: number of blocks reserved for bad block tables / struct mtd_ecc_stats { __u32 corrected; __u32 failed; __u32 badblocks; __u32 bbtblocks; }; / * MTD file modes - for read/write access to MTD * * @MTD_FILE_MODE_NORMAL: OTP disabled, ECC enabled * @MTD_FILE_MODE_OTP_FACTORY: OTP enabled in factory mode * @MTD_FILE_MODE_OTP_USER: OTP enabled in user mode * @MTD_FILE_MODE_RAW: OTP disabled, ECC disabled * * These modes can be set via ioctl(MTDFILEMODE). The mode will be retained * separately for each open file descriptor. * * Note: %MTD_FILE_MODE_RAW provides the same functionality as %MTD_OPS_RAW - * raw access to the flash, without error correction or autoplacement schemes. * Wherever possible, the MTD_OPS_* mode will override the MTD_FILE_MODE_* mode * (e.g., when using ioctl(MEMWRITE)), but in some cases, the MTD_FILE_MODE is * used out of necessity (e.g., `write()', ioctl(MEMWRITEOOB64)). / enum mtd_file_modes { MTD_FILE_MODE_NORMAL = MTD_OTP_OFF, MTD_FILE_MODE_OTP_FACTORY = MTD_OTP_FACTORY, MTD_FILE_MODE_OTP_USER = MTD_OTP_USER, MTD_FILE_MODE_RAW, }; static __inline__ int mtd_type_is_nand_user(const struct mtd_info_user mtd) { return mtd->type == MTD_NANDFLASH \|\| mtd->type == MTD_MLCNANDFLASH; } #endif /* __MTD_ABI_H__ */	9.7 KB	2026-03-24 10:01
📄 mtd-user.h /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note / / * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> * * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * / #ifndef __MTD_USER_H__ #define __MTD_USER_H__ / This file is blessed for inclusion by userspace / #include <mtd/mtd-abi.h> typedef struct mtd_info_user mtd_info_t; typedef struct erase_info_user erase_info_t; typedef struct region_info_user region_info_t; typedef struct nand_oobinfo nand_oobinfo_t; typedef struct nand_ecclayout_user nand_ecclayout_t; #endif / __MTD_USER_H__ */	1.21 KB	2026-03-24 10:01
📄 nftl-user.h /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note / / * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> * * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * / #ifndef __MTD_NFTL_USER_H__ #define __MTD_NFTL_USER_H__ #include <linux/types.h> / Block Control Information / struct nftl_bci { unsigned char ECCSig[6]; __u8 Status; __u8 Status1; }__attribute__((packed)); / Unit Control Information / struct nftl_uci0 { __u16 VirtUnitNum; __u16 ReplUnitNum; __u16 SpareVirtUnitNum; __u16 SpareReplUnitNum; } __attribute__((packed)); struct nftl_uci1 { __u32 WearInfo; __u16 EraseMark; __u16 EraseMark1; } __attribute__((packed)); struct nftl_uci2 { __u16 FoldMark; __u16 FoldMark1; __u32 unused; } __attribute__((packed)); union nftl_uci { struct nftl_uci0 a; struct nftl_uci1 b; struct nftl_uci2 c; }; struct nftl_oob { struct nftl_bci b; union nftl_uci u; }; / NFTL Media Header / struct NFTLMediaHeader { char DataOrgID[6]; __u16 NumEraseUnits; __u16 FirstPhysicalEUN; __u32 FormattedSize; unsigned char UnitSizeFactor; } __attribute__((packed)); #define MAX_ERASE_ZONES (8192 - 512) #define ERASE_MARK 0x3c69 #define SECTOR_FREE 0xff #define SECTOR_USED 0x55 #define SECTOR_IGNORE 0x11 #define SECTOR_DELETED 0x00 #define FOLD_MARK_IN_PROGRESS 0x5555 #define ZONE_GOOD 0xff #define ZONE_BAD_ORIGINAL 0 #define ZONE_BAD_MARKED 7 #endif / __MTD_NFTL_USER_H__ */	2.07 KB	2026-03-24 10:01
📄 ubi-user.h /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note / / * Copyright © International Business Machines Corp., 2006 * * 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. * * Block devices on UBI volumes * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * To create a R/O block device on top of an UBI volume the %UBI_IOCVOLCRBLK * should be used. A pointer to a &struct ubi_blkcreate_req object is expected * to be passed, which is not used and reserved for future usage. * * Conversely, to remove a block device the %UBI_IOCVOLRMBLK should be used, * which takes no arguments. / / * 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) / Read the specified PEB and scrub it if there are bitflips / #define UBI_IOCRPEB _IOW(UBI_IOC_MAGIC, 4, __s32) / Force scrubbing on the specified PEB / #define UBI_IOCSPEB _IOW(UBI_IOC_MAGIC, 5, __s32) / 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 * Note: This actually takes a pointer (__s64), but we can't change that without breaking the ABI on 32bit systems / #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) / Create a R/O block device on top of an UBI volume / #define UBI_IOCVOLCRBLK _IOW(UBI_VOL_IOC_MAGIC, 7, struct ubi_blkcreate_req) / Remove the R/O block device / #define UBI_IOCVOLRMBLK _IO(UBI_VOL_IOC_MAGIC, 8) / 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]; }; / * UBI volume flags. * * @UBI_VOL_SKIP_CRC_CHECK_FLG: skip the CRC check done on a static volume at * open time. Only valid for static volumes and * should only be used if the volume user has a * way to verify data integrity / enum { UBI_VOL_SKIP_CRC_CHECK_FLG = 0x1, }; #define UBI_VOL_VALID_FLGS (UBI_VOL_SKIP_CRC_CHECK_FLG) /* * 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) * @flags: volume flags (%UBI_VOL_SKIP_CRC_CHECK_FLG) * @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; __u8 flags; __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)); /* * struct ubi_blkcreate_req - a data structure used in block creation requests. * @padding: reserved for future, not used, has to be zeroed / struct ubi_blkcreate_req { __s8 padding[128]; } __attribute__((packed)); #endif / __UBI_USER_H__ */	17.79 KB	2026-03-24 10:01

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