include/fs.h

   1 /*
   2  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6 #ifndef _FS_H
   7 #define _FS_H
   8
   9 #include <common.h>
  10
  11 #define FS_TYPE_ANY     0
  12 #define FS_TYPE_FAT     1
  13 #define FS_TYPE_EXT     2
  14 #define FS_TYPE_SANDBOX 3
  15 #define FS_TYPE_UBIFS   4
  16 #define FS_TYPE_BTRFS   5
  17
  18 /*
  19  * Tell the fs layer which block device an partition to use for future
  20  * commands. This also internally identifies the filesystem that is present
  21  * within the partition. The identification process may be limited to a
  22  * specific filesystem type by passing FS_* in the fstype parameter.
  23  *
  24  * Returns 0 on success.
  25  * Returns non-zero if there is an error accessing the disk or partition, or
  26  * no known filesystem type could be recognized on it.
  27  */
  28 int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype);
  29
  30 /*
  31  * fs_set_blk_dev_with_part - Set current block device + partition
  32  *
  33  * Similar to fs_set_blk_dev(), but useful for cases where you already
  34  * know the blk_desc and part number.
  35  *
  36  * Returns 0 on success.
  37  * Returns non-zero if invalid partition or error accessing the disk.
  38  */
  39 int fs_set_blk_dev_with_part(struct blk_desc *desc, int part);
  40
  41 /*
  42  * Print the list of files on the partition previously set by fs_set_blk_dev(),
  43  * in directory "dirname".
  44  *
  45  * Returns 0 on success. Returns non-zero on error.
  46  */
  47 int fs_ls(const char *dirname);
  48
  49 /*
  50  * Determine whether a file exists
  51  *
  52  * Returns 1 if the file exists, 0 if it doesn't exist.
  53  */
  54 int fs_exists(const char *filename);
  55
  56 /*
  57  * fs_size - Determine a file's size
  58  *
  59  * @filename: Name of the file
  60  * @size: Size of file
  61  * @return 0 if ok with valid *size, negative on error
  62  */
  63 int fs_size(const char *filename, loff_t *size);
  64
  65 /*
  66  * fs_read - Read file from the partition previously set by fs_set_blk_dev()
  67  * Note that not all filesystem types support either/both offset!=0 or len!=0.
  68  *
  69  * @filename: Name of file to read from
  70  * @addr: The address to read into
  71  * @offset: The offset in file to read from
  72  * @len: The number of bytes to read. Maybe 0 to read entire file
  73  * @actread: Returns the actual number of bytes read
  74  * @return 0 if ok with valid *actread, -1 on error conditions
  75  */
  76 int fs_read(const char *filename, ulong addr, loff_t offset, loff_t len,
  77             loff_t *actread);
  78
  79 /*
  80  * fs_write - Write file to the partition previously set by fs_set_blk_dev()
  81  * Note that not all filesystem types support offset!=0.
  82  *
  83  * @filename: Name of file to read from
  84  * @addr: The address to read into
  85  * @offset: The offset in file to read from. Maybe 0 to write to start of file
  86  * @len: The number of bytes to write
  87  * @actwrite: Returns the actual number of bytes written
  88  * @return 0 if ok with valid *actwrite, -1 on error conditions
  89  */
  90 int fs_write(const char *filename, ulong addr, loff_t offset, loff_t len,
  91              loff_t *actwrite);
  92
  93 /*
  94  * Directory entry types, matches the subset of DT_x in posix readdir()
  95  * which apply to u-boot.
  96  */
  97 #define FS_DT_DIR  4         /* directory */
  98 #define FS_DT_REG  8         /* regular file */
  99 #define FS_DT_LNK  10        /* symbolic link */
 100
 101 /*
 102  * A directory entry, returned by fs_readdir().  Returns information
 103  * about the file/directory at the current directory entry position.
 104  */
 105 struct fs_dirent {
 106         unsigned type;       /* one of FS_DT_x (not a mask) */
 107         loff_t size;         /* size in bytes */
 108         char name[256];
 109 };
 110
 111 /* Note: fs_dir_stream should be treated as opaque to the user of fs layer */
 112 struct fs_dir_stream {
 113         /* private to fs. layer: */
 114         struct blk_desc *desc;
 115         int part;
 116 };
 117
 118 /*
 119  * fs_opendir - Open a directory
 120  *
 121  * @filename: the path to directory to open
 122  * @return a pointer to the directory stream or NULL on error and errno
 123  *    set appropriately
 124  */
 125 struct fs_dir_stream *fs_opendir(const char *filename);
 126
 127 /*
 128  * fs_readdir - Read the next directory entry in the directory stream.
 129  *
 130  * Works in an analogous way to posix readdir().  The previously returned
 131  * directory entry is no longer valid after calling fs_readdir() again.
 132  * After fs_closedir() is called, the returned directory entry is no
 133  * longer valid.
 134  *
 135  * @dirs: the directory stream
 136  * @return the next directory entry (only valid until next fs_readdir() or
 137  *    fs_closedir() call, do not attempt to free()) or NULL if the end of
 138  *    the directory is reached.
 139  */
 140 struct fs_dirent *fs_readdir(struct fs_dir_stream *dirs);
 141
 142 /*
 143  * fs_closedir - close a directory stream
 144  *
 145  * @dirs: the directory stream
 146  */
 147 void fs_closedir(struct fs_dir_stream *dirs);
 148
 149 /*
 150  * Common implementation for various filesystem commands, optionally limited
 151  * to a specific filesystem type via the fstype parameter.
 152  */
 153 int do_size(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 154                 int fstype);
 155 int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 156                 int fstype);
 157 int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 158                 int fstype);
 159 int file_exists(const char *dev_type, const char *dev_part, const char *file,
 160                 int fstype);
 161 int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 162                 int fstype);
 163
 164 /*
 165  * Determine the UUID of the specified filesystem and print it. Optionally it is
 166  * possible to store the UUID directly in env.
 167  */
 168 int do_fs_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 169                 int fstype);
 170
 171 /*
 172  * Determine the type of the specified filesystem and print it. Optionally it is
 173  * possible to store the type directly in env.
 174  */
 175 int do_fs_type(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
 176
 177 #endif /* _FS_H */