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  * Note that not all filesystem types support either/both offset!=0 or len!=0.
  77  *
  78  * @filename: Name of file to read from
  79  * @addr: The address to read into
  80  * @offset: The offset in file to read from
  81  * @len: The number of bytes to read. Maybe 0 to read entire file
  82  * @actread: Returns the actual number of bytes read
  83  * @return 0 if ok with valid *actread, -1 on error conditions
  84  */
  85 int fs_read(const char *filename, ulong addr, loff_t offset, loff_t len,
  86             loff_t *actread);
  87
  88 /*
  89  * fs_write - Write file to the partition previously set by fs_set_blk_dev()
  90  * Note that not all filesystem types support offset!=0.
  91  *
  92  * @filename: Name of file to read from
  93  * @addr: The address to read into
  94  * @offset: The offset in file to read from. Maybe 0 to write to start of file
  95  * @len: The number of bytes to write
  96  * @actwrite: Returns the actual number of bytes written
  97  * @return 0 if ok with valid *actwrite, -1 on error conditions
  98  */
  99 int fs_write(const char *filename, ulong addr, loff_t offset, loff_t len,
 100              loff_t *actwrite);
 101
 102 /*
 103  * Directory entry types, matches the subset of DT_x in posix readdir()
 104  * which apply to u-boot.
 105  */
 106 #define FS_DT_DIR  4         /* directory */
 107 #define FS_DT_REG  8         /* regular file */
 108 #define FS_DT_LNK  10        /* symbolic link */
 109
 110 /*
 111  * A directory entry, returned by fs_readdir().  Returns information
 112  * about the file/directory at the current directory entry position.
 113  */
 114 struct fs_dirent {
 115         unsigned type;       /* one of FS_DT_x (not a mask) */
 116         loff_t size;         /* size in bytes */
 117         char name[256];
 118 };
 119
 120 /* Note: fs_dir_stream should be treated as opaque to the user of fs layer */
 121 struct fs_dir_stream {
 122         /* private to fs. layer: */
 123         struct blk_desc *desc;
 124         int part;
 125 };
 126
 127 /*
 128  * fs_opendir - Open a directory
 129  *
 130  * @filename: the path to directory to open
 131  * @return a pointer to the directory stream or NULL on error and errno
 132  *    set appropriately
 133  */
 134 struct fs_dir_stream *fs_opendir(const char *filename);
 135
 136 /*
 137  * fs_readdir - Read the next directory entry in the directory stream.
 138  *
 139  * Works in an analogous way to posix readdir().  The previously returned
 140  * directory entry is no longer valid after calling fs_readdir() again.
 141  * After fs_closedir() is called, the returned directory entry is no
 142  * longer valid.
 143  *
 144  * @dirs: the directory stream
 145  * @return the next directory entry (only valid until next fs_readdir() or
 146  *    fs_closedir() call, do not attempt to free()) or NULL if the end of
 147  *    the directory is reached.
 148  */
 149 struct fs_dirent *fs_readdir(struct fs_dir_stream *dirs);
 150
 151 /*
 152  * fs_closedir - close a directory stream
 153  *
 154  * @dirs: the directory stream
 155  */
 156 void fs_closedir(struct fs_dir_stream *dirs);
 157
 158 /*
 159  * fs_unlink - delete a file or directory
 160  *
 161  * If a given name is a directory, it will be deleted only if it's empty
 162  *
 163  * @filename: Name of file or directory to delete
 164  * @return 0 on success, -1 on error conditions
 165  */
 166 int fs_unlink(const char *filename);
 167
 168 /*
 169  * fs_mkdir - Create a directory
 170  *
 171  * @filename: Name of directory to create
 172  * @return 0 on success, -1 on error conditions
 173  */
 174 int fs_mkdir(const char *filename);
 175
 176 /*
 177  * Common implementation for various filesystem commands, optionally limited
 178  * to a specific filesystem type via the fstype parameter.
 179  */
 180 int do_size(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 181                 int fstype);
 182 int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 183                 int fstype);
 184 int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 185                 int fstype);
 186 int file_exists(const char *dev_type, const char *dev_part, const char *file,
 187                 int fstype);
 188 int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 189                 int fstype);
 190 int do_rm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 191                 int fstype);
 192 int do_mkdir(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 193                 int fstype);
 194
 195 /*
 196  * Determine the UUID of the specified filesystem and print it. Optionally it is
 197  * possible to store the UUID directly in env.
 198  */
 199 int do_fs_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 200                 int fstype);
 201
 202 /*
 203  * Determine the type of the specified filesystem and print it. Optionally it is
 204  * possible to store the type directly in env.
 205  */
 206 int do_fs_type(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
 207
 208 #endif /* _FS_H */