1 /* 2 * Copyright (c) International Business Machines Corp., 2006 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 12 * the GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 * 18 * Author: Artem Bityutskiy (Битюцкий Артём) 19 */ 20 21 #ifndef __LINUX_UBI_H__ 22 #define __LINUX_UBI_H__ 23 24 #include <asm/ioctl.h> 25 #include <linux/types.h> 26 #include <mtd/ubi-user.h> 27 28 /* 29 * enum ubi_open_mode - UBI volume open mode constants. 30 * 31 * UBI_READONLY: read-only mode 32 * UBI_READWRITE: read-write mode 33 * UBI_EXCLUSIVE: exclusive mode 34 */ 35 enum { 36 UBI_READONLY = 1, 37 UBI_READWRITE, 38 UBI_EXCLUSIVE 39 }; 40 41 /** 42 * struct ubi_volume_info - UBI volume description data structure. 43 * @vol_id: volume ID 44 * @ubi_num: UBI device number this volume belongs to 45 * @size: how many physical eraseblocks are reserved for this volume 46 * @used_bytes: how many bytes of data this volume contains 47 * @used_ebs: how many physical eraseblocks of this volume actually contain any 48 * data 49 * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME) 50 * @corrupted: non-zero if the volume is corrupted (static volumes only) 51 * @upd_marker: non-zero if the volume has update marker set 52 * @alignment: volume alignment 53 * @usable_leb_size: how many bytes are available in logical eraseblocks of 54 * this volume 55 * @name_len: volume name length 56 * @name: volume name 57 * @cdev: UBI volume character device major and minor numbers 58 * 59 * The @corrupted flag is only relevant to static volumes and is always zero 60 * for dynamic ones. This is because UBI does not care about dynamic volume 61 * data protection and only cares about protecting static volume data. 62 * 63 * The @upd_marker flag is set if the volume update operation was interrupted. 64 * Before touching the volume data during the update operation, UBI first sets 65 * the update marker flag for this volume. If the volume update operation was 66 * further interrupted, the update marker indicates this. If the update marker 67 * is set, the contents of the volume is certainly damaged and a new volume 68 * update operation has to be started. 69 * 70 * To put it differently, @corrupted and @upd_marker fields have different 71 * semantics: 72 * o the @corrupted flag means that this static volume is corrupted for some 73 * reasons, but not because an interrupted volume update 74 * o the @upd_marker field means that the volume is damaged because of an 75 * interrupted update operation. 76 * 77 * I.e., the @corrupted flag is never set if the @upd_marker flag is set. 78 * 79 * The @used_bytes and @used_ebs fields are only really needed for static 80 * volumes and contain the number of bytes stored in this static volume and how 81 * many eraseblock this data occupies. In case of dynamic volumes, the 82 * @used_bytes field is equivalent to @size*@usable_leb_size, and the @used_ebs 83 * field is equivalent to @size. 84 * 85 * In general, logical eraseblock size is a property of the UBI device, not 86 * of the UBI volume. Indeed, the logical eraseblock size depends on the 87 * physical eraseblock size and on how much bytes UBI headers consume. But 88 * because of the volume alignment (@alignment), the usable size of logical 89 * eraseblocks if a volume may be less. The following equation is true: 90 * @usable_leb_size = LEB size - (LEB size mod @alignment), 91 * where LEB size is the logical eraseblock size defined by the UBI device. 92 * 93 * The alignment is multiple to the minimal flash input/output unit size or %1 94 * if all the available space is used. 95 * 96 * To put this differently, alignment may be considered is a way to change 97 * volume logical eraseblock sizes. 98 */ 99 struct ubi_volume_info { 100 int ubi_num; 101 int vol_id; 102 int size; 103 long long used_bytes; 104 int used_ebs; 105 int vol_type; 106 int corrupted; 107 int upd_marker; 108 int alignment; 109 int usable_leb_size; 110 int name_len; 111 const char *name; 112 dev_t cdev; 113 }; 114 115 /** 116 * struct ubi_device_info - UBI device description data structure. 117 * @ubi_num: ubi device number 118 * @leb_size: logical eraseblock size on this UBI device 119 * @min_io_size: minimal I/O unit size 120 * @ro_mode: if this device is in read-only mode 121 * @cdev: UBI character device major and minor numbers 122 * 123 * Note, @leb_size is the logical eraseblock size offered by the UBI device. 124 * Volumes of this UBI device may have smaller logical eraseblock size if their 125 * alignment is not equivalent to %1. 126 */ 127 struct ubi_device_info { 128 int ubi_num; 129 int leb_size; 130 int min_io_size; 131 int ro_mode; 132 dev_t cdev; 133 }; 134 135 /* UBI descriptor given to users when they open UBI volumes */ 136 struct ubi_volume_desc; 137 138 int ubi_get_device_info(int ubi_num, struct ubi_device_info *di); 139 void ubi_get_volume_info(struct ubi_volume_desc *desc, 140 struct ubi_volume_info *vi); 141 struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode); 142 struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name, 143 int mode); 144 void ubi_close_volume(struct ubi_volume_desc *desc); 145 int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset, 146 int len, int check); 147 int ubi_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf, 148 int offset, int len, int dtype); 149 int ubi_leb_change(struct ubi_volume_desc *desc, int lnum, const void *buf, 150 int len, int dtype); 151 int ubi_leb_erase(struct ubi_volume_desc *desc, int lnum); 152 int ubi_leb_unmap(struct ubi_volume_desc *desc, int lnum); 153 int ubi_leb_map(struct ubi_volume_desc *desc, int lnum, int dtype); 154 int ubi_is_mapped(struct ubi_volume_desc *desc, int lnum); 155 156 /* 157 * This function is the same as the 'ubi_leb_read()' function, but it does not 158 * provide the checking capability. 159 */ 160 static inline int ubi_read(struct ubi_volume_desc *desc, int lnum, char *buf, 161 int offset, int len) 162 { 163 return ubi_leb_read(desc, lnum, buf, offset, len, 0); 164 } 165 166 /* 167 * This function is the same as the 'ubi_leb_write()' functions, but it does 168 * not have the data type argument. 169 */ 170 static inline int ubi_write(struct ubi_volume_desc *desc, int lnum, 171 const void *buf, int offset, int len) 172 { 173 return ubi_leb_write(desc, lnum, buf, offset, len, UBI_UNKNOWN); 174 } 175 176 /* 177 * This function is the same as the 'ubi_leb_change()' functions, but it does 178 * not have the data type argument. 179 */ 180 static inline int ubi_change(struct ubi_volume_desc *desc, int lnum, 181 const void *buf, int len) 182 { 183 return ubi_leb_change(desc, lnum, buf, len, UBI_UNKNOWN); 184 } 185 186 #endif /* !__LINUX_UBI_H__ */ 187