include/fs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   4  */
   5 #ifndef _FS_H
   6 #define _FS_H
   7
   8 #include <rtc.h>
   9
  10 struct cmd_tbl;
  11
  12 #define FS_TYPE_ANY     0
  13 #define FS_TYPE_FAT     1
  14 #define FS_TYPE_EXT     2
  15 #define FS_TYPE_SANDBOX 3
  16 #define FS_TYPE_UBIFS   4
  17 #define FS_TYPE_BTRFS   5
  18 #define FS_TYPE_SQUASHFS 6
  19 #define FS_TYPE_EROFS   7
  20 #define FS_TYPE_SEMIHOSTING 8
  21
  22 struct blk_desc;
  23
  24 /**
  25  * do_fat_fsload - Run the fatload command
  26  *
  27  * @cmdtp: Command information for fatload
  28  * @flag: Command flags (CMD_FLAG_...)
  29  * @argc: Number of arguments
  30  * @argv: List of arguments
  31  * Return: result (see enum command_ret_t)
  32  */
  33 int do_fat_fsload(struct cmd_tbl *cmdtp, int flag, int argc,
  34                   char *const argv[]);
  35
  36 /**
  37  * do_ext2load - Run the ext2load command
  38  *
  39  * @cmdtp: Command information for ext2load
  40  * @flag: Command flags (CMD_FLAG_...)
  41  * @argc: Number of arguments
  42  * @argv: List of arguments
  43  * Return: result (see enum command_ret_t)
  44  */
  45 int do_ext2load(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
  46
  47 /*
  48  * Tell the fs layer which block device and partition to use for future
  49  * commands. This also internally identifies the filesystem that is present
  50  * within the partition. The identification process may be limited to a
  51  * specific filesystem type by passing FS_* in the fstype parameter.
  52  *
  53  * Returns 0 on success.
  54  * Returns non-zero if there is an error accessing the disk or partition, or
  55  * no known filesystem type could be recognized on it.
  56  */
  57 int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype);
  58
  59 /**
  60  * fs_set_type() - Tell fs layer which filesystem type is used
  61  *
  62  * This is needed when reading from a non-block device such as sandbox. It does
  63  * a similar job to fs_set_blk_dev() but just sets the filesystem type instead
  64  * of detecting it and loading it on the block device
  65  *
  66  * @type: Filesystem type to use (FS_TYPE...)
  67  */
  68 void fs_set_type(int type);
  69
  70 /*
  71  * fs_set_blk_dev_with_part - Set current block device + partition
  72  *
  73  * Similar to fs_set_blk_dev(), but useful for cases where you already
  74  * know the blk_desc and part number.
  75  *
  76  * Returns 0 on success.
  77  * Returns non-zero if invalid partition or error accessing the disk.
  78  */
  79 int fs_set_blk_dev_with_part(struct blk_desc *desc, int part);
  80
  81 /**
  82  * fs_close() - Unset current block device and partition
  83  *
  84  * fs_close() closes the connection to a file system opened with either
  85  * fs_set_blk_dev() or fs_set_dev_with_part().
  86  *
  87  * Many file functions implicitly call fs_close(), e.g. fs_closedir(),
  88  * fs_exist(), fs_ln(), fs_ls(), fs_mkdir(), fs_read(), fs_size(), fs_write(),
  89  * fs_unlink().
  90  */
  91 void fs_close(void);
  92
  93 /**
  94  * fs_get_type() - Get type of current filesystem
  95  *
  96  * Return: filesystem type
  97  *
  98  * Returns filesystem type representing the current filesystem, or
  99  * FS_TYPE_ANY for any unrecognised filesystem.
 100  */
 101 int fs_get_type(void);
 102
 103 /**
 104  * fs_get_type_name() - Get type of current filesystem
 105  *
 106  * Return: Pointer to filesystem name
 107  *
 108  * Returns a string describing the current filesystem, or the sentinel
 109  * "unsupported" for any unrecognised filesystem.
 110  */
 111 const char *fs_get_type_name(void);
 112
 113 /*
 114  * Print the list of files on the partition previously set by fs_set_blk_dev(),
 115  * in directory "dirname".
 116  *
 117  * Returns 0 on success. Returns non-zero on error.
 118  */
 119 int fs_ls(const char *dirname);
 120
 121 /*
 122  * Determine whether a file exists
 123  *
 124  * Returns 1 if the file exists, 0 if it doesn't exist.
 125  */
 126 int fs_exists(const char *filename);
 127
 128 /*
 129  * fs_size - Determine a file's size
 130  *
 131  * @filename: Name of the file
 132  * @size: Size of file
 133  * Return: 0 if ok with valid *size, negative on error
 134  */
 135 int fs_size(const char *filename, loff_t *size);
 136
 137 /**
 138  * fs_read() - read file from the partition previously set by fs_set_blk_dev()
 139  *
 140  * Note that not all filesystem drivers support either or both of offset != 0
 141  * and len != 0.
 142  *
 143  * @filename:   full path of the file to read from
 144  * @addr:       address of the buffer to write to
 145  * @offset:     offset in the file from where to start reading
 146  * @len:        the number of bytes to read. Use 0 to read entire file.
 147  * @actread:    returns the actual number of bytes read
 148  * Return:      0 if OK with valid *actread, -1 on error conditions
 149  */
 150 int fs_read(const char *filename, ulong addr, loff_t offset, loff_t len,
 151             loff_t *actread);
 152
 153 /**
 154  * fs_write() - write file to the partition previously set by fs_set_blk_dev()
 155  *
 156  * Note that not all filesystem drivers support offset != 0.
 157  *
 158  * @filename:   full path of the file to write to
 159  * @addr:       address of the buffer to read from
 160  * @offset:     offset in the file from where to start writing
 161  * @len:        the number of bytes to write
 162  * @actwrite:   returns the actual number of bytes written
 163  * Return:      0 if OK with valid *actwrite, -1 on error conditions
 164  */
 165 int fs_write(const char *filename, ulong addr, loff_t offset, loff_t len,
 166              loff_t *actwrite);
 167
 168 /*
 169  * Directory entry types, matches the subset of DT_x in posix readdir()
 170  * which apply to u-boot.
 171  */
 172 #define FS_DT_DIR  4         /* directory */
 173 #define FS_DT_REG  8         /* regular file */
 174 #define FS_DT_LNK  10        /* symbolic link */
 175
 176 #define FS_DIRENT_NAME_LEN 256
 177
 178 /**
 179  * struct fs_dirent - directory entry
 180  *
 181  * A directory entry, returned by fs_readdir(). Returns information
 182  * about the file/directory at the current directory entry position.
 183  */
 184 struct fs_dirent {
 185         /** @type:              one of FS_DT_x (not a mask) */
 186         unsigned int type;
 187         /** @size:              file size */
 188         loff_t size;
 189         /** @flags:             attribute flags (FS_ATTR_*) */
 190         u32 attr;
 191         /** create_time:        time of creation */
 192         struct rtc_time create_time;
 193         /** access_time:        time of last access */
 194         struct rtc_time access_time;
 195         /** change_time:        time of last modification */
 196         struct rtc_time change_time;
 197         /** name:               file name */
 198         char name[FS_DIRENT_NAME_LEN];
 199 };
 200
 201 /* Note: fs_dir_stream should be treated as opaque to the user of fs layer */
 202 struct fs_dir_stream {
 203         /* private to fs. layer: */
 204         struct blk_desc *desc;
 205         int part;
 206 };
 207
 208 /*
 209  * fs_opendir - Open a directory
 210  *
 211  * @filename: the path to directory to open
 212  * Return: a pointer to the directory stream or NULL on error and errno
 213  *    set appropriately
 214  */
 215 struct fs_dir_stream *fs_opendir(const char *filename);
 216
 217 /*
 218  * fs_readdir - Read the next directory entry in the directory stream.
 219  *
 220  * Works in an analogous way to posix readdir().  The previously returned
 221  * directory entry is no longer valid after calling fs_readdir() again.
 222  * After fs_closedir() is called, the returned directory entry is no
 223  * longer valid.
 224  *
 225  * @dirs: the directory stream
 226  * Return: the next directory entry (only valid until next fs_readdir() or
 227  *    fs_closedir() call, do not attempt to free()) or NULL if the end of
 228  *    the directory is reached.
 229  */
 230 struct fs_dirent *fs_readdir(struct fs_dir_stream *dirs);
 231
 232 /*
 233  * fs_closedir - close a directory stream
 234  *
 235  * @dirs: the directory stream
 236  */
 237 void fs_closedir(struct fs_dir_stream *dirs);
 238
 239 /*
 240  * fs_unlink - delete a file or directory
 241  *
 242  * If a given name is a directory, it will be deleted only if it's empty
 243  *
 244  * @filename: Name of file or directory to delete
 245  * Return: 0 on success, -1 on error conditions
 246  */
 247 int fs_unlink(const char *filename);
 248
 249 /*
 250  * fs_mkdir - Create a directory
 251  *
 252  * @filename: Name of directory to create
 253  * Return: 0 on success, -1 on error conditions
 254  */
 255 int fs_mkdir(const char *filename);
 256
 257 /*
 258  * Common implementation for various filesystem commands, optionally limited
 259  * to a specific filesystem type via the fstype parameter.
 260  */
 261 int do_size(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 262             int fstype);
 263 int do_load(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 264             int fstype);
 265 int do_ls(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 266           int fstype);
 267 int file_exists(const char *dev_type, const char *dev_part, const char *file,
 268                 int fstype);
 269 int do_save(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 270             int fstype);
 271 int do_rm(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 272           int fstype);
 273 int do_mkdir(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 274              int fstype);
 275 int do_ln(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 276           int fstype);
 277
 278 /*
 279  * Determine the UUID of the specified filesystem and print it. Optionally it is
 280  * possible to store the UUID directly in env.
 281  */
 282 int do_fs_uuid(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[],
 283                int fstype);
 284
 285 /*
 286  * Determine the type of the specified filesystem and print it. Optionally it is
 287  * possible to store the type directly in env.
 288  */
 289 int do_fs_type(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
 290
 291 /**
 292  * do_fs_types - List supported filesystems.
 293  *
 294  * @cmdtp: Command information for fstypes
 295  * @flag: Command flags (CMD_FLAG_...)
 296  * @argc: Number of arguments
 297  * @argv: List of arguments
 298  * Return: result (see enum command_ret_t)
 299  */
 300 int do_fs_types(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[]);
 301
 302 /**
 303  * fs_read_alloc() - Allocate space for a file and read it
 304  *
 305  * You must call fs_set_blk_dev() or a similar function before calling this,
 306  * since that sets up the block device to use.
 307  *
 308  * The file is terminated with a nul character
 309  *
 310  * @fname: Filename to read
 311  * @size: Size of file to read (must be correct!)
 312  * @align: Alignment to use for memory allocation (0 for default)
 313  * @bufp: On success, returns the allocated buffer with the nul-terminated file
 314  *      in it
 315  * Return: 0 if OK, -ENOMEM if out of memory, -EIO if read failed
 316  */
 317 int fs_read_alloc(const char *fname, ulong size, uint align, void **bufp);
 318
 319 /**
 320  * fs_load_alloc() - Load a file into allocated space
 321  *
 322  * The file is terminated with a nul character
 323  *
 324  * @ifname: Interface name to read from (e.g. "mmc")
 325  * @dev_part_str: Device and partition string (e.g. "1:2")
 326  * @fname: Filename to read
 327  * @max_size: Maximum allowed size for the file (use 0 for 1GB)
 328  * @align: Alignment to use for memory allocation (0 for default)
 329  * @bufp: On success, returns the allocated buffer with the nul-terminated file
 330  *      in it
 331  * @sizep: On success, returns the size of the file
 332  * Return: 0 if OK, -ENOMEM if out of memory, -ENOENT if the file does not
 333  * exist, -ENOMEDIUM if the device does not exist, -E2BIG if the file is too
 334  * large (greater than @max_size), -EIO if read failed
 335  */
 336 int fs_load_alloc(const char *ifname, const char *dev_part_str,
 337                   const char *fname, ulong max_size, ulong align, void **bufp,
 338                   ulong *sizep);
 339
 340 #endif /* _FS_H */