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 <common.h>
   9
  10 #define FS_TYPE_ANY     0
  11 #define FS_TYPE_FAT     1
  12 #define FS_TYPE_EXT     2
  13 #define FS_TYPE_SANDBOX 3
  14 #define FS_TYPE_UBIFS   4
  15 #define FS_TYPE_BTRFS   5
  16
  17 /*
  18  * Tell the fs layer which block device an partition to use for future
  19  * commands. This also internally identifies the filesystem that is present
  20  * within the partition. The identification process may be limited to a
  21  * specific filesystem type by passing FS_* in the fstype parameter.
  22  *
  23  * Returns 0 on success.
  24  * Returns non-zero if there is an error accessing the disk or partition, or
  25  * no known filesystem type could be recognized on it.
  26  */
  27 int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype);
  28
  29 /*
  30  * fs_set_blk_dev_with_part - Set current block device + partition
  31  *
  32  * Similar to fs_set_blk_dev(), but useful for cases where you already
  33  * know the blk_desc and part number.
  34  *
  35  * Returns 0 on success.
  36  * Returns non-zero if invalid partition or error accessing the disk.
  37  */
  38 int fs_set_blk_dev_with_part(struct blk_desc *desc, int part);
  39
  40 /**
  41  * fs_get_type_name() - Get type of current filesystem
  42  *
  43  * Return: Pointer to filesystem name
  44  *
  45  * Returns a string describing the current filesystem, or the sentinel
  46  * "unsupported" for any unrecognised filesystem.
  47  */
  48 const char *fs_get_type_name(void);
  49
  50 /*
  51  * Print the list of files on the partition previously set by fs_set_blk_dev(),
  52  * in directory "dirname".
  53  *
  54  * Returns 0 on success. Returns non-zero on error.
  55  */
  56 int fs_ls(const char *dirname);
  57
  58 /*
  59  * Determine whether a file exists
  60  *
  61  * Returns 1 if the file exists, 0 if it doesn't exist.
  62  */
  63 int fs_exists(const char *filename);
  64
  65 /*
  66  * fs_size - Determine a file's size
  67  *
  68  * @filename: Name of the file
  69  * @size: Size of file
  70  * @return 0 if ok with valid *size, negative on error
  71  */
  72 int fs_size(const char *filename, loff_t *size);
  73
  74 /**
  75  * fs_read() - read file from the partition previously set by fs_set_blk_dev()
  76  *
  77  * Note that not all filesystem drivers support either or both of offset != 0
  78  * and len != 0.
  79  *
  80  * @filename:   full path of the file to read from
  81  * @addr:       address of the buffer to write to
  82  * @offset:     offset in the file from where to start reading
  83  * @len:        the number of bytes to read. Use 0 to read entire file.
  84  * @actread:    returns the actual number of bytes read
  85  * Return:      0 if OK with valid *actread, -1 on error conditions
  86  */
  87 int fs_read(const char *filename, ulong addr, loff_t offset, loff_t len,
  88             loff_t *actread);
  89
  90 /**
  91  * fs_write() - write file to the partition previously set by fs_set_blk_dev()
  92  *
  93  * Note that not all filesystem drivers support offset != 0.
  94  *
  95  * @filename:   full path of the file to write to
  96  * @addr:       address of the buffer to read from
  97  * @offset:     offset in the file from where to start writing
  98  * @len:        the number of bytes to write
  99  * @actwrite:   returns the actual number of bytes written
 100  * Return:      0 if OK with valid *actwrite, -1 on error conditions
 101  */
 102 int fs_write(const char *filename, ulong addr, loff_t offset, loff_t len,
 103              loff_t *actwrite);
 104
 105 /*
 106  * Directory entry types, matches the subset of DT_x in posix readdir()
 107  * which apply to u-boot.
 108  */
 109 #define FS_DT_DIR  4         /* directory */
 110 #define FS_DT_REG  8         /* regular file */
 111 #define FS_DT_LNK  10        /* symbolic link */
 112
 113 /*
 114  * A directory entry, returned by fs_readdir().  Returns information
 115  * about the file/directory at the current directory entry position.
 116  */
 117 struct fs_dirent {
 118         unsigned type;       /* one of FS_DT_x (not a mask) */
 119         loff_t size;         /* size in bytes */
 120         char name[256];
 121 };
 122
 123 /* Note: fs_dir_stream should be treated as opaque to the user of fs layer */
 124 struct fs_dir_stream {
 125         /* private to fs. layer: */
 126         struct blk_desc *desc;
 127         int part;
 128 };
 129
 130 /*
 131  * fs_opendir - Open a directory
 132  *
 133  * @filename: the path to directory to open
 134  * @return a pointer to the directory stream or NULL on error and errno
 135  *    set appropriately
 136  */
 137 struct fs_dir_stream *fs_opendir(const char *filename);
 138
 139 /*
 140  * fs_readdir - Read the next directory entry in the directory stream.
 141  *
 142  * Works in an analogous way to posix readdir().  The previously returned
 143  * directory entry is no longer valid after calling fs_readdir() again.
 144  * After fs_closedir() is called, the returned directory entry is no
 145  * longer valid.
 146  *
 147  * @dirs: the directory stream
 148  * @return the next directory entry (only valid until next fs_readdir() or
 149  *    fs_closedir() call, do not attempt to free()) or NULL if the end of
 150  *    the directory is reached.
 151  */
 152 struct fs_dirent *fs_readdir(struct fs_dir_stream *dirs);
 153
 154 /*
 155  * fs_closedir - close a directory stream
 156  *
 157  * @dirs: the directory stream
 158  */
 159 void fs_closedir(struct fs_dir_stream *dirs);
 160
 161 /*
 162  * fs_unlink - delete a file or directory
 163  *
 164  * If a given name is a directory, it will be deleted only if it's empty
 165  *
 166  * @filename: Name of file or directory to delete
 167  * @return 0 on success, -1 on error conditions
 168  */
 169 int fs_unlink(const char *filename);
 170
 171 /*
 172  * fs_mkdir - Create a directory
 173  *
 174  * @filename: Name of directory to create
 175  * @return 0 on success, -1 on error conditions
 176  */
 177 int fs_mkdir(const char *filename);
 178
 179 /*
 180  * Common implementation for various filesystem commands, optionally limited
 181  * to a specific filesystem type via the fstype parameter.
 182  */
 183 int do_size(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 184                 int fstype);
 185 int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 186                 int fstype);
 187 int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 188                 int fstype);
 189 int file_exists(const char *dev_type, const char *dev_part, const char *file,
 190                 int fstype);
 191 int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 192                 int fstype);
 193 int do_rm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 194                 int fstype);
 195 int do_mkdir(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 196                 int fstype);
 197 int do_ln(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 198           int fstype);
 199
 200 /*
 201  * Determine the UUID of the specified filesystem and print it. Optionally it is
 202  * possible to store the UUID directly in env.
 203  */
 204 int do_fs_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 205                 int fstype);
 206
 207 /*
 208  * Determine the type of the specified filesystem and print it. Optionally it is
 209  * possible to store the type directly in env.
 210  */
 211 int do_fs_type(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
 212
 213 #endif /* _FS_H */