329 lines
8.0 KiB
C
329 lines
8.0 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef _FS_H_
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#define _FS_H_
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#include <sys/types.h>
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#include <fs/fs_interface.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Create a fs_file_t type similar to FILE for familiarity */
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typedef struct _fs_file_object fs_file_t;
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/* Create a fs_dir_t type similar to DIR for familiarity */
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typedef struct _fs_dir_object fs_dir_t;
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enum fs_dir_entry_type {
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FS_DIR_ENTRY_FILE,
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FS_DIR_ENTRY_DIR
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};
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/**
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* @brief File System Functions
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* @defgroup data_structures File System Data Structures
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* @ingroup file_system
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* @{
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*/
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/** @var fs_file_t
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* @brief File object representing an open file
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*/
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/** @var fs_dir_t
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* @brief Directory object representing an open directory
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*/
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/**
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* @brief Structure to receive file or directory information
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*
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* Used in functions that reads the directory entries to get
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* file or directory information.
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*
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* @param dir_entry_type Whether file or directory
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* - FS_DIR_ENTRY_FILE
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* - FS_DIR_ENTRY_DIR
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* @param name Name of directory or file
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* @param size Size of file. 0 if directory
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*/
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struct fs_dirent {
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enum fs_dir_entry_type type;
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char name[MAX_FILE_NAME + 1];
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size_t size;
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};
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/**
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* @brief Structure to receive volume statistics
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*
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* Used to retrieve information about total and available space
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* in the volume.
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*
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* @param f_bsize Optimal transfer block size
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* @param f_frsize Allocation unit size
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* @param f_blocks Size of FS in f_frsize units
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* @param f_bfree Number of free blocks
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*/
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struct fs_statvfs {
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unsigned long f_bsize;
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unsigned long f_frsize;
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unsigned long f_blocks;
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unsigned long f_bfree;
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};
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/**
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* @}
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*/
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#ifndef FS_SEEK_SET
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#define FS_SEEK_SET 0 /* Seek from beginning of file. */
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#endif
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#ifndef FS_SEEK_CUR
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#define FS_SEEK_CUR 1 /* Seek from current position. */
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#endif
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#ifndef FS_SEEK_END
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#define FS_SEEK_END 2 /* Seek from end of file. */
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#endif
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/**
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* @brief File System APIs
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* @defgroup file_system_api File System APIs
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* @ingroup file_system
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* @{
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*/
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/**
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* @brief File open
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*
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* Opens an existing file or create a new one and associates
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* a stream with it.
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*
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* @param zfp Pointer to file object
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* @param file_name The name of file to open
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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*/
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int fs_open(fs_file_t *zfp, const char *file_name);
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/**
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* @brief File close
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*
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* Flushes the associated stream and closes
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* the file.
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*
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* @param zfp Pointer to the file object
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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*/
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int fs_close(fs_file_t *zfp);
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/**
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* @brief File unlink
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*
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* Deletes the specified file or directory
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*
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* @param path Path to the file or directory to delete
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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*/
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int fs_unlink(const char *path);
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/**
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* @brief File read
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*
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* Reads items of data of size bytes long.
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*
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* @param zfp Pointer to the file object
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* @param ptr Pointer to the data buffer
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* @param size Number of bytes to be read
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*
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* @return Number of bytes read. On success, it will be equal to number of
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* items requested to be read. Returns less than number of bytes
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* requested if there are not enough bytes available in file. Will return
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* -ERRNO code on error.
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*/
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ssize_t fs_read(fs_file_t *zfp, void *ptr, size_t size);
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/**
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* @brief File write
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*
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* Writes items of data of size bytes long.
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*
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* @param zfp Pointer to the file object
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* @param ptr Pointer to the data buffer
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* @param size Number of bytes to be write
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*
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* @return Number of bytes written. On success, it will be equal to the number
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* of bytes requested to be written. Any other value, indicates an error. Will
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* return -ERRNO code on error.
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* In the case where -ERRNO is returned, the file pointer will not be
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* advanced because it couldn't start the operation.
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* In the case where it is able to write, but is not able to complete writing
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* all of the requested number of bytes, then it is because the disk got full.
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* In that case, it returns less number of bytes written than requested, but
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* not a negative -ERRNO value as in regular error case.
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*/
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ssize_t fs_write(fs_file_t *zfp, const void *ptr, size_t size);
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/**
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* @brief File seek
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*
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* Moves the file position to a new location in the file. The offset is added
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* to file position based on the 'whence' parameter.
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*
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* @param zfp Pointer to the file object
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* @param offset Relative location to move the file pointer to
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* @param whence Relative location from where offset is to be calculated.
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* - FS_SEEK_SET = from beginning of file
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* - FS_SEEK_CUR = from current position,
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* - FS_SEEK_END = from end of file.
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error.
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*/
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int fs_seek(fs_file_t *zfp, off_t offset, int whence);
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/**
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* @brief Get current file position.
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*
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* Retrieves the current position in the file.
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*
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* @param zfp Pointer to the file object
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*
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* @retval position Current position in file
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* Current revision does not validate the file object.
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*/
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off_t fs_tell(fs_file_t *zfp);
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/**
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* @brief Change the size of an open file
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*
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* Truncates the file to the new length if it is shorter than the current
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* size of the file. Expands the file if the new length is greater than the
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* current size of the file. The expanded region would be filled with zeroes.
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*
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* @note In the case of expansion, if the volume got full during the
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* expansion process, the function will expand to the maximum possible length
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* and returns success. Caller should check if the expanded size matches the
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* requested length.
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*
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* @param zfp Pointer to the file object
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* @param length New size of the file in bytes
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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*/
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int fs_truncate(fs_file_t *zfp, off_t length);
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/**
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* @brief Flushes any cached write of an open file
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*
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* This function can be used to flush the cache of an open file. This can
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* be called to ensure data gets written to the storage media immediately.
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* This may be done to avoid data loss if power is removed unexpectedly.
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* Note that closing a file will cause caches to be flushed correctly so it
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* need not be called if the file is being closed.
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*
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* @param zfp Pointer to the file object
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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*/
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int fs_sync(fs_file_t *zfp);
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/**
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* @brief Directory create
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*
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* Creates a new directory using specified path.
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*
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* @param path Path to the directory to create
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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*/
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int fs_mkdir(const char *path);
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/**
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* @brief Directory open
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*
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* Opens an existing directory specified by the path.
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*
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* @param zdp Pointer to the directory object
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* @param path Path to the directory to open
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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*/
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int fs_opendir(fs_dir_t *zdp, const char *path);
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/**
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* @brief Directory read entry
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*
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* Reads directory entries of a open directory
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*
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* @param zdp Pointer to the directory object
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* @param entry Pointer to zfs_dirent structure to read the entry into
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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* @return In end-of-dir condition, this will return 0 and set
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* entry->name[0] = 0
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*/
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int fs_readdir(fs_dir_t *zdp, struct fs_dirent *entry);
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/**
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* @brief Directory close
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*
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* Closes an open directory.
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*
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* @param zdp Pointer to the directory object
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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*/
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int fs_closedir(fs_dir_t *zdp);
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/**
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* @brief File or directory status
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*
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* Checks the status of a file or directory specified by the path
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*
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* @param path Path to the file or directory
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* @param entry Pointer to zfs_dirent structure to fill if file or directory
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* exists.
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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*/
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int fs_stat(const char *path, struct fs_dirent *entry);
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/**
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* @brief Retrieves statistics of the file system volume
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*
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* Returns the total and available space in the file system volume.
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*
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* @param stat Pointer to zfs_statvfs structure to receive the fs statistics
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*
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* @retval 0 Success
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* @retval -ERRNO errno code if error
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*/
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int fs_statvfs(struct fs_statvfs *stat);
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* _FS_H_ */
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