fs_operation.h

浏览该文件的文档.

/*
 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 *    of conditions and the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef FS_OPERATION_H
#define FS_OPERATION_H
 
#include "fs/file.h"
#include "fs/fd_table.h"
 
#ifdef __cplusplus
#if __cplusplus
extern "C" {
#endif /* __cplusplus */
#endif /* __cplusplus */
 
/**
 * @ingroup  fs
 * @brief Initializes the vfs filesystem
 *
 * @par Description:
 * This API is used to initializes the vfs filesystem
 *
 * @attention
 * <ul>
 * <li>Called only once, multiple calls will cause file system error.</li>
 * </ul>
 *
 * @param none
 *
 * @retval none
 * @par Dependency:
 * <ul><li>fs.h: the header file that contains the API declaration.</li></ul>
 * @see NULL
 */
 
void los_vfs_init(void);
 
void CloseOnExec(struct files_struct *files);
void SetCloexecFlag(int procFd);
bool CheckCloexecFlag(int procFd);
void ClearCloexecFlag(int procFd);
 
void clear_fd(int fd);
 
/**
 * @ingroup  fs
 * @brief    locate character in string.
 *
 * @par Description:
 * The API function returns a pointer to the last occurrence of the character c in the string s.
 *
 * @attention
 * <ul>
 * <li>The parameter s must point a valid string, which end with the terminating null byte.</li>
 * </ul>
 *
 * @param s [IN]  Type #const char*  A pointer to string.
 * @param c [IN]  Type #int          The character.
 *
 * @retval #char*        a pointer to the matched character or NULL if the character is not found.
 *
 * @par Dependency:
 * <ul><li>fs.h: the header file that contains the API declaration.</li></ul>
 * @see rindex
 */
 
extern char *rindex(const char *s, int c);
 
/**
 * @ingroup fs
 *
 * @par Description:
 * The set_label() function shall set the value of a global varible,
 * the value will be used to set the label of SD card in format().
 *
 * @param name  [IN] label to set, the length must be less than 12
 *
 * @attention
 * <ul>
 * <li>The function must be called before format().</li>
 * </ul>
 *
 * @retval #void   None.
 *
 * @par Dependency:
 * <ul><li>fs.h</li></ul>
 * @see format
 */
 
extern void set_label(const char *name);
 
/**
 * @ingroup  fs
 * @brief formatting sd card
 *
 * @par Description:
 * formatting sd card.
 *
 * @attention
 * <ul>
 * <li>The prefix of the parameter dev must be "/dev", and the length must be less than the value defined by PATH_MAX.
 *     There are four kind of format option: FMT_FAT16, FMT_FAT32, FMT_ANY, FMT_ERASE. If users input anything else,
 *     the default format option is FMT_ANY. Format option is decided by the number of clusters. Choosing the wrong
 *     option will cause error of format. The detailed information of (FAT16,FAT32) is ff.h.
 * </li>
 * </ul>
 *
 * @param  dev          [IN] Type #const char*  path of the block device to format, which must be a really
 *                           existing block device node.
 * @param  sectors      [IN] Type #int number of sectors per cluster.
 * @param  option       [IN] Type #int option of format.
 *
 * @retval #0      Format success.
 * @retval #-1     Format failed.
 *
 * @par Dependency:
 * <ul><li>unistd.h: the header file that contains the API declaration.</li></ul>
 * @see
 *
 */
 
extern int format(const char *dev, int sectors, int option);
 
/**
 * @ingroup  fs
 * @brief   list directory contents.
 *
 * @par Description:
 * List information about the FILEs (the current directory by default).
 *
 * @attention
 * <ul>
 * <li>The total length of parameter pathname must be less than the value defined by PATH_MAX.</li>
 * </ul>
 *
 * @param pathname [IN]  Type #const char*  The file pathname.
 *
 * @retval
 * <ul>None.</ul>
 *
 * @par Dependency:
 * <ul><li>fs.h: the header file that contains the API declaration.</li></ul>
 * @see ls
 */
 
extern void ls(const char *pathname);
 
/**
 * @ingroup  fs
 * @brief set current system time is valid or invalid for FAT file system.
 *
 * @par Description:
 * The function is used for setting current system time is valid or invalid for FAT file system.
 * The value can be set as FAT_SYSTEM_TIME_ENABLE/FAT_SYSTEM_TIME_DISABLE.
 *
 * @attention
 * <ul>
 * <li>When the system time is valid, it should set FAT_SYSTEM_TIME_ENABLE.</li>
 * <li>When the system time is invalid, it should set FAT_SYSTEM_TIME_DISABLE.</li>
 * </ul>
 *
 * @param  b_status             [IN] Type #BOOL    system time status.
 *
 * @retval #0      set status success
 * @retval #-22    Invalid argument
 *
 * @par Dependency:
 * <ul><li>fs.h: the header file that contains the API declaration.</li></ul>
 * @see
 *
 */
 
extern int los_set_systime_status(BOOL b_status);
 
/**
 * @ingroup fs
 *
 * @par Description:
 * The chattr() function shall change the mode of file named by the pathname pointed to by the path argument.
 *
 * @attention
 * <ul>
 * <li>Now only fat filesystem support this function.</li>
 * </ul>
 *
 * @retval #0  On success.
 * @retval #-1 On failure with errno set.
 *
 * @par Errors
 * <ul>
 * <li><b>EINVAL</b>: The path is a null pointer or points to an empty string.</li>
 * <li><b>ENAMETOOLONG</b>: The length of a component of a pathname is longer than {NAME_MAX}.</li>
 * <li><b>ENOENT</b>: A component of the path does not exist.</li>
 * <li><b>EPERM</b>: The entry represented by the path is a mount point.</li>
 * <li><b>ENOSYS</b>: The file system doesn't support this function.</li>
 * <li><b>EACCES</b>: It is a read-only file system.</li>
 * <li><b>ENOMEM</b>: Out of memory.</li>
 * <li><b>EIO</b>: A hard error occurred in the low level disk I/O layer or the physical drive cannot work.</li>
 * <li><b>ENODEV</b>: The device is not existed.</li>
 * </ul>
 *
 * @par Dependency:
 * <ul><li>fs.h</li></ul>
 * @see None
 */
 
struct IATTR;
extern int chattr(const char *pathname, struct IATTR *attr);
 
#define CONTINE_NUTTX_FCNTL 0XFF0F
/**
 * @ingroup fs
 *
 * @par Description:
 * The VfsFcntl function shall manipulate file descriptor.
 *
 * @retval #0  On success.
 * @retval #-1 On failure with errno set.
 * @retval CONTINE_NUTTX_FCNTL doesn't support some cmds in VfsFcntl, needs to continue going through Nuttx vfs operation.</li>
 *
 * @par Dependency:
 * <ul><li>fs.h</li></ul>
 * @see None
 */
 
extern int VfsFcntl(int fd, int cmd, ...);
/**
 * @ingroup fs
 *
 * @par Description:
 * The LOS_BcacheSyncByName() function shall sync all the data in the cache corresponding to the disk name to the disk.
 *
 * @param name  [IN] name of the disk
 *
 * @attention
 * <ul>
 * <li>Now only fat filesystem support this function.</li>
 * </ul>
 *
 * @retval #0      On success.
 * @retval #INT32  On failure.
 *
 * @par Dependency:
 * <ul><li>fs.h</li></ul>
 * @see None
 */
 
extern INT32 LOS_BcacheSyncByName(const CHAR *name);
 
/**
 * @ingroup fs
 *
 * @par Description:
 * The LOS_GetDirtyRatioByName() function shall return the percentage of dirty blocks in the cache corresponding
 * to the disk name.
 *
 * @param name  [IN] name of the disk
 *
 * @attention
 * <ul>
 * <li>Now only fat filesystem support this function.</li>
 * </ul>
 *
 * @retval #INT32  the percentage of dirty blocks.
 * @retval #-1     On failure.
 *
 * @par Dependency:
 * <ul><li>fs.h</li></ul>
 * @see None
 */
 
extern INT32 LOS_GetDirtyRatioByName(const CHAR *name);
 
#ifdef LOSCFG_FS_FAT_CACHE_SYNC_THREAD
/**
 * @ingroup fs
 *
 * @par Description:
 * The LOS_SetDirtyRatioThreshold() function shall set the dirty ratio threshold of bcache. When the percentage
 * of dirty blocks in the cache is greater than the threshold, write back data to disk.
 *
 * @param dirtyRatio  [IN] Threshold of the percentage of dirty blocks, expressed in %.
 *
 * @attention
 * <ul>
 * <li>The dirtyRatio must be less than or equal to 100, or the setting is invalid.</li>
 * </ul>
 *
 * @retval #VOID  None.
 *
 * @par Dependency:
 * <ul><li>fs.h</li></ul>
 * @see LOS_SetSyncThreadInterval | LOS_SetSyncThreadPrio
 */
 
extern VOID LOS_SetDirtyRatioThreshold(UINT32 dirtyRatio);
 
/**
 * @ingroup fs
 *
 * @par Description:
 * The LOS_SetSyncThreadInterval() function shall set the interval for the sync thread to wake up.
 *
 * @param interval [IN] the interval time for the sync thread to wake up, in milliseconds, accuracy is 10ms.
 *
 * @attention
 * <ul>
 * <li>None</li>
 * </ul>
 *
 * @retval #VOID  None.
 *
 * @par Dependency:
 * <ul><li>fs.h</li></ul>
 * @see LOS_SetDirtyRatioThreshold | LOS_SetSyncThreadPrio
 */
 
extern VOID LOS_SetSyncThreadInterval(UINT32 interval);
 
/**
 * @ingroup fs
 *
 * @par Description:
 * The LOS_SetSyncThreadPrio() function shall set the priority of the sync thread.
 *
 * @param prio  [IN] priority of sync thread to be set
 * @param name  [IN] name of the disk
 *
 * @attention
 * <ul>
 * <li>The prio must be less than 31 and be greater than 0, or the setting is invalid.</li>
 * <li>If the parameter name is NULL, it only set the value of a global variable, and take effect the next time the
 * thread is created. If name is not NULL and can't find the disk corresponding to name, it shall return an error.</li>
 * </ul>
 *
 * @retval #INT32  On failure.
 * @retval 0       On success.
 *
 * @par Dependency:
 * <ul><li>fs.h</li></ul>
 * @see LOS_SetDirtyRatioThreshold | LOS_SetSyncThreadInterval | LOS_TaskPriSet
 */
 
extern INT32 LOS_SetSyncThreadPrio(UINT32 prio, const CHAR *name);
 
#endif
 
#ifdef __cplusplus
#if __cplusplus
}
#endif /* __cplusplus */
#endif /* __cplusplus */
#endif