text: /*
   * Copyright (c) 2020 Nordic Semiconductor ASA
   *
   * SPDX-License-Identifier: Apache-2.0
   */
  
  #ifndef ZEPHYR_INCLUDE_FS_FS_SYS_H_
  #define ZEPHYR_INCLUDE_FS_FS_SYS_H_
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**
   * @ingroup file_system_api
   * @{
   */
  
  /**
   * @brief File System interface structure
   *
   * @param open Opens or creates a file, depending on flags given
   * @param read Reads nbytes number of bytes
   * @param write Writes nbytes number of bytes
   * @param lseek Moves the file position to a new location in the file
   * @param tell Retrieves the current position in the file
   * @param truncate Truncates/expands the file to the new length
   * @param sync Flushes the cache of an open file
   * @param close Flushes the associated stream and closes the file
   * @param opendir Opens an existing directory specified by the path
   * @param readdir Reads directory entries of an open directory
   * @param closedir Closes an open directory
   * @param mount Mounts a file system
   * @param unmount Unmounts a file system
   * @param unlink Deletes the specified file or directory
   * @param rename Renames a file or directory
   * @param mkdir Creates a new directory using specified path
   * @param stat Checks the status of a file or directory specified by the path
   * @param statvfs Returns the total and available space on the file system
   *        volume
   */
  struct fs_file_system_t {
  	/* File operations */
  	int (*open)(struct fs_file_t *filp, const char *fs_path,
  		    fs_mode_t flags);
  	ssize_t (*read)(struct fs_file_t *filp, void *dest, size_t nbytes);
  	ssize_t (*write)(struct fs_file_t *filp,
  					const void *src, size_t nbytes);
  	int (*lseek)(struct fs_file_t *filp, off_t off, int whence);
  	off_t (*tell)(struct fs_file_t *filp);
  	int (*truncate)(struct fs_file_t *filp, off_t length);
  	int (*sync)(struct fs_file_t *filp);
  	int (*close)(struct fs_file_t *filp);
  	/* Directory operations */
  	int (*opendir)(struct fs_dir_t *dirp, const char *fs_path);
  	int (*readdir)(struct fs_dir_t *dirp, struct fs_dirent *entry);
  	int (*closedir)(struct fs_dir_t *dirp);
  	/* File system level operations */
  	int (*mount)(struct fs_mount_t *mountp);
  	int (*unmount)(struct fs_mount_t *mountp);
  	int (*unlink)(struct fs_mount_t *mountp, const char *name);
  	int (*rename)(struct fs_mount_t *mountp, const char *from,
  					const char *to);
  	int (*mkdir)(struct fs_mount_t *mountp, const char *name);
  	int (*stat)(struct fs_mount_t *mountp, const char *path,
  					struct fs_dirent *entry);
  	int (*statvfs)(struct fs_mount_t *mountp, const char *path,
  					struct fs_statvfs *stat);
  };
  
  /**
   * @}
   */
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* ZEPHYR_INCLUDE_FS_FS_SYS_H_ */
  