/*
   * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   *

   * SPDX-License-Identifier:	GPL-2.0

   */
  #ifndef _FS_H
  #define _FS_H
  
  #include <common.h>
  
  #define FS_TYPE_ANY	0
  #define FS_TYPE_FAT	1
  #define FS_TYPE_EXT	2

  #define FS_TYPE_SANDBOX	3

  #define FS_TYPE_UBIFS	4

  #define FS_TYPE_BTRFS	5

  
  /*
   * Tell the fs layer which block device an partition to use for future
   * commands. This also internally identifies the filesystem that is present
   * within the partition. The identification process may be limited to a
   * specific filesystem type by passing FS_* in the fstype parameter.
   *
   * Returns 0 on success.
   * Returns non-zero if there is an error accessing the disk or partition, or
   * no known filesystem type could be recognized on it.
   */
  int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype);
  
  /*

   * fs_set_blk_dev_with_part - Set current block device + partition
   *
   * Similar to fs_set_blk_dev(), but useful for cases where you already
   * know the blk_desc and part number.
   *
   * Returns 0 on success.
   * Returns non-zero if invalid partition or error accessing the disk.
   */
  int fs_set_blk_dev_with_part(struct blk_desc *desc, int part);
  
  /*

   * Print the list of files on the partition previously set by fs_set_blk_dev(),
   * in directory "dirname".
   *
   * Returns 0 on success. Returns non-zero on error.
   */
  int fs_ls(const char *dirname);
  
  /*

   * Determine whether a file exists
   *
   * Returns 1 if the file exists, 0 if it doesn't exist.
   */
  int fs_exists(const char *filename);
  
  /*

   * fs_size - Determine a file's size

   *

   * @filename: Name of the file
   * @size: Size of file
   * @return 0 if ok with valid *size, negative on error

   */

  int fs_size(const char *filename, loff_t *size);

  
  /*

   * fs_read - Read file from the partition previously set by fs_set_blk_dev()
   * Note that not all filesystem types support either/both offset!=0 or len!=0.

   *

   * @filename: Name of file to read from
   * @addr: The address to read into
   * @offset: The offset in file to read from
   * @len: The number of bytes to read. Maybe 0 to read entire file
   * @actread: Returns the actual number of bytes read
   * @return 0 if ok with valid *actread, -1 on error conditions

   */

  int fs_read(const char *filename, ulong addr, loff_t offset, loff_t len,
  	    loff_t *actread);

  
  /*

   * fs_write - Write file to the partition previously set by fs_set_blk_dev()
   * Note that not all filesystem types support offset!=0.

   *

   * @filename: Name of file to read from
   * @addr: The address to read into
   * @offset: The offset in file to read from. Maybe 0 to write to start of file
   * @len: The number of bytes to write
   * @actwrite: Returns the actual number of bytes written
   * @return 0 if ok with valid *actwrite, -1 on error conditions

   */

  int fs_write(const char *filename, ulong addr, loff_t offset, loff_t len,
  	     loff_t *actwrite);

  
  /*

   * Directory entry types, matches the subset of DT_x in posix readdir()
   * which apply to u-boot.
   */
  #define FS_DT_DIR  4         /* directory */
  #define FS_DT_REG  8         /* regular file */
  #define FS_DT_LNK  10        /* symbolic link */
  
  /*
   * A directory entry, returned by fs_readdir().  Returns information
   * about the file/directory at the current directory entry position.
   */
  struct fs_dirent {
  	unsigned type;       /* one of FS_DT_x (not a mask) */
  	loff_t size;         /* size in bytes */
  	char name[256];
  };
  
  /* Note: fs_dir_stream should be treated as opaque to the user of fs layer */
  struct fs_dir_stream {
  	/* private to fs. layer: */
  	struct blk_desc *desc;
  	int part;
  };
  
  /*
   * fs_opendir - Open a directory
   *
   * @filename: the path to directory to open
   * @return a pointer to the directory stream or NULL on error and errno
   *    set appropriately
   */
  struct fs_dir_stream *fs_opendir(const char *filename);
  
  /*
   * fs_readdir - Read the next directory entry in the directory stream.
   *
   * Works in an analogous way to posix readdir().  The previously returned
   * directory entry is no longer valid after calling fs_readdir() again.
   * After fs_closedir() is called, the returned directory entry is no
   * longer valid.
   *
   * @dirs: the directory stream
   * @return the next directory entry (only valid until next fs_readdir() or
   *    fs_closedir() call, do not attempt to free()) or NULL if the end of
   *    the directory is reached.
   */
  struct fs_dirent *fs_readdir(struct fs_dir_stream *dirs);
  
  /*
   * fs_closedir - close a directory stream
   *
   * @dirs: the directory stream
   */
  void fs_closedir(struct fs_dir_stream *dirs);
  
  /*

   * Common implementation for various filesystem commands, optionally limited
   * to a specific filesystem type via the fstype parameter.
   */

  int do_size(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
  		int fstype);

  int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],

  		int fstype);

  int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
  		int fstype);

  int file_exists(const char *dev_type, const char *dev_part, const char *file,
  		int fstype);

  int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],

  		int fstype);

  /*
   * Determine the UUID of the specified filesystem and print it. Optionally it is
   * possible to store the UUID directly in env.
   */
  int do_fs_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
  		int fstype);

  /*
   * Determine the type of the specified filesystem and print it. Optionally it is
   * possible to store the type directly in env.
   */
  int do_fs_type(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);

  #endif /* _FS_H */