273 lines
6.4 KiB
C
273 lines
6.4 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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 ZFILE type similar to FILE for familiarity */
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typedef struct _zfile_object ZFILE;
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/* Create a ZDIR type similar to DIR for familiarity */
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typedef struct _zdir_object ZDIR;
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enum dir_entry_type {
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DIR_ENTRY_FILE,
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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 ZFILE
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* @brief File object representing an open file
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*/
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/** @var ZDIR
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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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* - DIR_ENTRY_FILE
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* - 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 zfs_dirent {
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enum 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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* @}
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*/
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#ifndef SEEK_SET
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#define SEEK_SET 0 /* Seek from beginning of file. */
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#endif
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#ifndef SEEK_CUR
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#define SEEK_CUR 1 /* Seek from current position. */
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#endif
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#ifndef SEEK_END
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#define 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(ZFILE *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(ZFILE *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(ZFILE *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(ZFILE *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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* - SEEK_SET = from beginning of file
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* - SEEK_CUR = from current position,
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* - 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(ZFILE *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(ZFILE *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(ZDIR *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(ZDIR *zdp, struct zfs_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(ZDIR *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 zfs_dirent *entry);
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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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