unify the components/dfs coding style according to the /documentation/coding_style_cn.txt

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1866 bbd45198-f89e-11dd-88c7-29a3b14d5316

16 files changed, 870 insertions, 735 deletions

diff --git a/components/dfs/filesystems/elmfat/dfs_elm.c b/components/dfs/filesystems/elmfat/dfs_elm.c
index f85411f108..d52874255c 100644
--- a/components/dfs/filesystems/elmfat/dfs_elm.c
+++ b/components/dfs/filesystems/elmfat/dfs_elm.c
@@ -73,7 +73,7 @@ static int elm_result_to_dfs(FRESULT result)
 	return status;
 }
 
-int dfs_elm_mount(struct dfs_filesystem* fs, unsigned long rwflag, const void* data)
+int dfs_elm_mount(struct dfs_filesystem *fs, unsigned long rwflag, const void *data)
 {
 	FATFS *fat;
 	FRESULT result;
@@ -87,12 +87,13 @@ int dfs_elm_mount(struct dfs_filesystem* fs, unsigned long rwflag, const void* d
 			break;
 		}
 	}
-	if (index == _VOLUMES) return -DFS_STATUS_ENOSPC;
+	if (index == _VOLUMES)
+		return -DFS_STATUS_ENOSPC;
 
 	/* get device */
 	disk[index] = fs->dev_id;
 
-	fat = (FATFS *) rt_malloc(sizeof(FATFS));
+	fat = (FATFS *)rt_malloc(sizeof(FATFS));
 	if (fat == RT_NULL)
 	{
 		return -1;
@@ -111,13 +112,13 @@ int dfs_elm_mount(struct dfs_filesystem* fs, unsigned long rwflag, const void* d
 	return 0;
 }
 
-int dfs_elm_unmount(struct dfs_filesystem* fs)
+int dfs_elm_unmount(struct dfs_filesystem *fs)
 {
 	FATFS *fat;
 	FRESULT result;
 	rt_uint32_t index;
 
-	fat = (FATFS*) fs->data;
+	fat = (FATFS *)fs->data;
 
 	RT_ASSERT(fat != RT_NULL);
 
@@ -141,7 +142,7 @@ int dfs_elm_unmount(struct dfs_filesystem* fs)
 	return -DFS_STATUS_ENOENT;
 }
 
-int dfs_elm_mkfs(const char* device_name)
+int dfs_elm_mkfs(const char *device_name)
 {
 	BYTE drv;
 	rt_device_t dev;
@@ -156,7 +157,7 @@ int dfs_elm_mkfs(const char* device_name)
 			/* 1: no partition table */
 			/* 0: auto selection of cluster size */
 			result = f_mkfs(drv, 1, 0);
-			if ( result != FR_OK)
+			if (result != FR_OK)
 			{
 				rt_kprintf("format error\n");
 				return elm_result_to_dfs(result);
@@ -171,7 +172,7 @@ int dfs_elm_mkfs(const char* device_name)
 	return -DFS_STATUS_EIO;
 }
 
-int dfs_elm_statfs(struct dfs_filesystem* fs, struct statfs *buf)
+int dfs_elm_statfs(struct dfs_filesystem *fs, struct statfs *buf)
 {
 	FATFS *f;
 	FRESULT res;
@@ -181,11 +182,12 @@ int dfs_elm_statfs(struct dfs_filesystem* fs, struct statfs *buf)
 	RT_ASSERT(fs != RT_NULL);
 	RT_ASSERT(buf != RT_NULL);
 
-	f = (FATFS*) fs->data;
+	f = (FATFS *)fs->data;
 
 	rt_snprintf(driver, sizeof(driver), "%d:", f->drv);
 	res = f_getfree(driver, &fre_clust, &f);
-	if (res) return elm_result_to_dfs(res);
+	if (res) 
+		return elm_result_to_dfs(res);
 
 	/* Get total sectors and free sectors */
 	tot_sect = (f->n_fatent - 2) * f->csize;
@@ -202,9 +204,9 @@ int dfs_elm_statfs(struct dfs_filesystem* fs, struct statfs *buf)
 	return 0;
 }
 
-int dfs_elm_open(struct dfs_fd* file)
+int dfs_elm_open(struct dfs_fd *file)
 {
-	FIL* fd;
+	FIL *fd;
 	BYTE mode;
 	FRESULT result;
 	char *drivers_fn;
@@ -215,9 +217,11 @@ int dfs_elm_open(struct dfs_fd* file)
 
 	/* add path for ELM FatFS driver support */
 	vol = elm_get_vol((FATFS *)file->fs->data);
-	if (vol < 0) return -DFS_STATUS_ENOENT;
+	if (vol < 0)
+		return -DFS_STATUS_ENOENT;
 	drivers_fn = rt_malloc(256);
-	if (drivers_fn == RT_NULL) return -DFS_STATUS_ENOMEM;
+	if (drivers_fn == RT_NULL)
+		return -DFS_STATUS_ENOMEM;
 
 	rt_snprintf(drivers_fn, 256, "%d:%s", vol, file->path);
 #else
@@ -267,17 +271,22 @@ int dfs_elm_open(struct dfs_fd* file)
 	{
 		mode = FA_READ;
 
-		if (file->flags & DFS_O_WRONLY) mode |= FA_WRITE;
-		if ((file->flags & DFS_O_ACCMODE) & DFS_O_RDWR) mode |= FA_WRITE;
+		if (file->flags & DFS_O_WRONLY)
+			mode |= FA_WRITE;
+		if ((file->flags & DFS_O_ACCMODE) & DFS_O_RDWR)
+			mode |= FA_WRITE;
 		/* Opens the file, if it is existing. If not, a new file is created. */
-		if (file->flags & DFS_O_CREAT) mode |= FA_OPEN_ALWAYS;
+		if (file->flags & DFS_O_CREAT)
+			mode |= FA_OPEN_ALWAYS;
 		/* Creates a new file. If the file is existing, it is truncated and overwritten. */
-		if (file->flags & DFS_O_TRUNC) mode |= FA_CREATE_ALWAYS;
+		if (file->flags & DFS_O_TRUNC)
+			mode |= FA_CREATE_ALWAYS;
 		/* Creates a new file. The function fails if the file is already existing. */
-		if (file->flags & DFS_O_EXCL) mode |= FA_CREATE_NEW;
+		if (file->flags & DFS_O_EXCL)
+			mode |= FA_CREATE_NEW;
 
 		/* allocate a fd */
-		fd = (FIL*)rt_malloc(sizeof(FIL));
+		fd = (FIL *)rt_malloc(sizeof(FIL));
 		if (fd == RT_NULL)
 		{
 			return -DFS_STATUS_ENOMEM;
@@ -309,16 +318,16 @@ int dfs_elm_open(struct dfs_fd* file)
 	return DFS_STATUS_OK;
 }
 
-int dfs_elm_close(struct dfs_fd* file)
+int dfs_elm_close(struct dfs_fd *file)
 {
 	FRESULT result;
 
 	result = FR_OK;
 	if (file->type == FT_DIRECTORY)
 	{
-		DIR* dir;
+		DIR *dir;
 
-		dir = (DIR*)(file->data);
+		dir = (DIR *)(file->data);
 		RT_ASSERT(dir != RT_NULL);
 
 		/* release memory */
@@ -326,8 +335,8 @@ int dfs_elm_close(struct dfs_fd* file)
 	}
 	else if (file->type == FT_REGULAR)
 	{
-		FIL* fd;
-		fd = (FIL*)(file->data);
+		FIL *fd;
+		fd = (FIL *)(file->data);
 		RT_ASSERT(fd != RT_NULL);
 
 		result = f_close(fd);
@@ -341,14 +350,14 @@ int dfs_elm_close(struct dfs_fd* file)
 	return elm_result_to_dfs(result);
 }
 
-int dfs_elm_ioctl(struct dfs_fd* file, int cmd,	void* args)
+int dfs_elm_ioctl(struct dfs_fd *file, int cmd,	void *args)
 {
 	return -DFS_STATUS_ENOSYS;
 }
 
-int dfs_elm_read(struct dfs_fd* file, void* buf, rt_size_t len)
+int dfs_elm_read(struct dfs_fd *file, void *buf, rt_size_t len)
 {
-	FIL* fd;
+	FIL *fd;
 	FRESULT result;
 	UINT byte_read;
 
@@ -357,20 +366,21 @@ int dfs_elm_read(struct dfs_fd* file, void* buf, rt_size_t len)
 		return -DFS_STATUS_EISDIR;
 	}
 
-	fd = (FIL*)(file->data);
+	fd = (FIL *)(file->data);
 	RT_ASSERT(fd != RT_NULL);
 
 	result = f_read(fd, buf, len, &byte_read);
 	/* update position */
 	file->pos  = fd->fptr;
-	if (result == FR_OK) return byte_read;
+	if (result == FR_OK)
+		return byte_read;
 
 	return elm_result_to_dfs(result);
 }
 
-int dfs_elm_write(struct dfs_fd* file, const void* buf, rt_size_t len)
+int dfs_elm_write(struct dfs_fd *file, const void *buf, rt_size_t len)
 {
-	FIL* fd;
+	FIL *fd;
 	FRESULT result;
 	UINT byte_write;
 
@@ -379,39 +389,40 @@ int dfs_elm_write(struct dfs_fd* file, const void* buf, rt_size_t len)
 		return -DFS_STATUS_EISDIR;
 	}
 
-	fd = (FIL*)(file->data);
+	fd = (FIL *)(file->data);
 	RT_ASSERT(fd != RT_NULL);
 
 	result = f_write(fd, buf, len, &byte_write);
 	/* update position and file size */
 	file->pos  = fd->fptr;
 	file->size = fd->fsize;
-	if (result == FR_OK) return byte_write;
+	if (result == FR_OK)
+		return byte_write;
 
 	return elm_result_to_dfs(result);
 }
 
-int dfs_elm_flush(struct dfs_fd* file)
+int dfs_elm_flush(struct dfs_fd *file)
 {
-	FIL* fd;
+	FIL *fd;
 	FRESULT result;
 
-	fd = (FIL*)(file->data);
+	fd = (FIL *)(file->data);
 	RT_ASSERT(fd != RT_NULL);
 
 	result = f_sync(fd);
 	return elm_result_to_dfs(result);
 }
 
-int dfs_elm_lseek(struct dfs_fd* file, rt_off_t offset)
+int dfs_elm_lseek(struct dfs_fd *file, rt_off_t offset)
 {
 	FRESULT result = FR_OK;
 	if (file->type == FT_REGULAR)
 	{
-		FIL* fd;
+		FIL *fd;
 
 		/* regular file type */
-		fd = (FIL*)(file->data);
+		fd = (FIL *)(file->data);
 		RT_ASSERT(fd != RT_NULL);
 		
 		result = f_lseek(fd, offset);
@@ -424,9 +435,9 @@ int dfs_elm_lseek(struct dfs_fd* file, rt_off_t offset)
 	else if (file->type == FT_DIRECTORY)
 	{
 		/* which is a directory */
-		DIR* dir;
+		DIR *dir;
 
-		dir = (DIR*)(file->data);
+		dir = (DIR *)(file->data);
 		RT_ASSERT(dir != RT_NULL);
 
 		result = f_seekdir(dir, offset / sizeof(struct dirent));
@@ -441,20 +452,21 @@ int dfs_elm_lseek(struct dfs_fd* file, rt_off_t offset)
 	return elm_result_to_dfs(result);
 }
 
-int dfs_elm_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count)
+int dfs_elm_getdents(struct dfs_fd *file, struct dirent *dirp, rt_uint32_t count)
 {
-	DIR* dir;
+	DIR *dir;
 	FILINFO fno;
 	FRESULT result;
 	rt_uint32_t index;
-	struct dirent* d;
+	struct dirent *d;
 
-	dir = (DIR*)(file->data);
+	dir = (DIR *)(file->data);
 	RT_ASSERT(dir != RT_NULL);
 
 	/* make integer count */
 	count = (count / sizeof(struct dirent)) * sizeof(struct dirent);
-	if ( count == 0 ) return -DFS_STATUS_EINVAL;
+	if (count == 0)
+		return -DFS_STATUS_EINVAL;
 
 #if _USE_LFN
 	/* allocate long file name */
@@ -470,7 +482,8 @@ int dfs_elm_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count
 		d = dirp + index;
 
 		result = f_readdir(dir, &fno);
-		if (result != FR_OK || fno.fname[0] == 0) break;
+		if (result != FR_OK || fno.fname[0] == 0)
+			break;
 
 #if _USE_LFN
 		fn = *fno.lfname? fno.lfname : fno.fname;
@@ -479,15 +492,17 @@ int dfs_elm_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count
 #endif
 
 		d->d_type = DFS_DT_UNKNOWN;
-		if (fno.fattrib & AM_DIR) d->d_type = DFS_DT_DIR;
-		else d->d_type = DFS_DT_REG;
+		if (fno.fattrib & AM_DIR)
+			d->d_type = DFS_DT_DIR;
+		else
+			d->d_type = DFS_DT_REG;
 
 		d->d_namlen = rt_strlen(fn);
 		d->d_reclen = (rt_uint16_t)sizeof(struct dirent);
 		rt_strncpy(d->d_name, fn, rt_strlen(fn) + 1);
 
 		index ++;
-		if ( index * sizeof(struct dirent) >= count )
+		if (index * sizeof(struct dirent) >= count)
 			break;
 	}
 
@@ -503,7 +518,7 @@ int dfs_elm_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count
 	return index * sizeof(struct dirent);
 }
 
-int dfs_elm_unlink(struct dfs_filesystem* fs, const char* path)
+int dfs_elm_unlink(struct dfs_filesystem *fs, const char *path)
 {
 	FRESULT result;
 
@@ -514,9 +529,11 @@ int dfs_elm_unlink(struct dfs_filesystem* fs, const char* path)
 
 	/* add path for ELM FatFS driver support */
 	vol = elm_get_vol((FATFS *)fs->data);
-	if (vol < 0) return -DFS_STATUS_ENOENT;
+	if (vol < 0)
+		return -DFS_STATUS_ENOENT;
 	drivers_fn = rt_malloc(256);
-	if (drivers_fn == RT_NULL) return -DFS_STATUS_ENOMEM;
+	if (drivers_fn == RT_NULL)
+		return -DFS_STATUS_ENOMEM;
 
 	rt_snprintf(drivers_fn, 256, "%d:%s", vol, path);
 #else
@@ -531,7 +548,7 @@ int dfs_elm_unlink(struct dfs_filesystem* fs, const char* path)
 	return elm_result_to_dfs(result);
 }
 
-int dfs_elm_rename(struct dfs_filesystem* fs, const char* oldpath, const char* newpath)
+int dfs_elm_rename(struct dfs_filesystem *fs, const char *oldpath, const char *newpath)
 {
 	FRESULT result;
 
@@ -543,10 +560,12 @@ int dfs_elm_rename(struct dfs_filesystem* fs, const char* oldpath, const char* n
 
 	/* add path for ELM FatFS driver support */
 	vol = elm_get_vol((FATFS *)fs->data);
-	if (vol < 0) return -DFS_STATUS_ENOENT;
+	if (vol < 0)
+		return -DFS_STATUS_ENOENT;
 
 	drivers_oldfn = rt_malloc(256);
-	if (drivers_oldfn == RT_NULL) return -DFS_STATUS_ENOMEM;
+	if (drivers_oldfn == RT_NULL)
+		return -DFS_STATUS_ENOMEM;
 	drivers_newfn = newpath;
 
 	rt_snprintf(drivers_oldfn, 256, "%d:%s", vol, oldpath);
@@ -564,7 +583,7 @@ int dfs_elm_rename(struct dfs_filesystem* fs, const char* oldpath, const char* n
 	return elm_result_to_dfs(result);
 }
 
-int dfs_elm_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)
+int dfs_elm_stat(struct dfs_filesystem *fs, const char *path, struct stat *st)
 {
 	FILINFO file_info;
 	FRESULT result;
@@ -577,9 +596,11 @@ int dfs_elm_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)
 
 	/* add path for ELM FatFS driver support */
 	vol = elm_get_vol((FATFS *)fs->data);
-	if (vol < 0) return -DFS_STATUS_ENOENT;
+	if (vol < 0)
+		return -DFS_STATUS_ENOENT;
 	drivers_fn = rt_malloc(256);
-	if (drivers_fn == RT_NULL) return -DFS_STATUS_ENOMEM;
+	if (drivers_fn == RT_NULL)
+		return -DFS_STATUS_ENOMEM;
 
 	rt_snprintf(drivers_fn, 256, "%d:%s", vol, path);
 #else
@@ -600,7 +621,7 @@ int dfs_elm_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)
 	if (result == FR_OK)
 	{
 		/* convert to dfs stat structure */
-		st->st_dev   = 0;
+		st->st_dev = 0;
 
 		st->st_mode = DFS_S_IFREG | DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |
 		DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH;
@@ -659,19 +680,19 @@ int elm_init(void)
 #include "diskio.h"
 
 /* Inidialize a Drive */
-DSTATUS disk_initialize (BYTE drv)
+DSTATUS disk_initialize(BYTE drv)
 {
 	return 0;
 }
 
 /* Return Disk Status */
-DSTATUS disk_status (BYTE drv)
+DSTATUS disk_status(BYTE drv)
 {
 	return 0;
 }
 
 /* Read Sector(s) */
-DRESULT disk_read (BYTE drv, BYTE *buff, DWORD sector, BYTE count)
+DRESULT disk_read(BYTE drv, BYTE *buff, DWORD sector, BYTE count)
 {
 	rt_size_t result;
 	rt_device_t device = disk[drv];
@@ -686,7 +707,7 @@ DRESULT disk_read (BYTE drv, BYTE *buff, DWORD sector, BYTE count)
 }
 
 /* Write Sector(s) */
-DRESULT disk_write (BYTE drv, const BYTE *buff, DWORD sector, BYTE count)
+DRESULT disk_write(BYTE drv, const BYTE *buff, DWORD sector, BYTE count)
 {
 	rt_size_t result;
 	rt_device_t device = disk[drv];
@@ -701,11 +722,12 @@ DRESULT disk_write (BYTE drv, const BYTE *buff, DWORD sector, BYTE count)
 }
 
 /* Miscellaneous Functions */
-DRESULT disk_ioctl (BYTE drv, BYTE ctrl, void *buff)
+DRESULT disk_ioctl(BYTE drv, BYTE ctrl, void *buff)
 {
 	rt_device_t device = disk[drv];
 
-	if (device == RT_NULL) return RES_ERROR;
+	if (device == RT_NULL)
+		return RES_ERROR;
 
 	if (ctrl == GET_SECTOR_COUNT)
 	{
@@ -714,8 +736,9 @@ DRESULT disk_ioctl (BYTE drv, BYTE ctrl, void *buff)
 		rt_memset(&geometry, 0, sizeof(geometry));
 		rt_device_control(device, RT_DEVICE_CTRL_BLK_GETGEOME, &geometry);
 
-		*(DWORD*)buff = geometry.sector_count;
-		if (geometry.sector_count == 0) return RES_ERROR;
+		*(DWORD *)buff = geometry.sector_count;
+		if (geometry.sector_count == 0)
+			return RES_ERROR;
 	}
 	else if (ctrl == GET_SECTOR_SIZE)
 	{
@@ -724,7 +747,7 @@ DRESULT disk_ioctl (BYTE drv, BYTE ctrl, void *buff)
 		rt_memset(&geometry, 0, sizeof(geometry));
 		rt_device_control(device, RT_DEVICE_CTRL_BLK_GETGEOME, &geometry);
 
-		*(WORD*)buff = geometry.bytes_per_sector;
+		*(WORD *)buff = geometry.bytes_per_sector;
 	}
 	else if (ctrl == GET_BLOCK_SIZE) /* Get erase block size in unit of sectors (DWORD) */
 	{
@@ -733,19 +756,19 @@ DRESULT disk_ioctl (BYTE drv, BYTE ctrl, void *buff)
 		rt_memset(&geometry, 0, sizeof(geometry));
 		rt_device_control(device, RT_DEVICE_CTRL_BLK_GETGEOME, &geometry);
 
-		*(DWORD*)buff = geometry.block_size/geometry.bytes_per_sector;
+		*(DWORD *)buff = geometry.block_size/geometry.bytes_per_sector;
 	}
 
 	return RES_OK;
 }
 
-rt_time_t get_fattime()
+rt_time_t get_fattime(void)
 {
 	return 0;
 }
 
 #if _FS_REENTRANT
-int ff_cre_syncobj(BYTE drv, _SYNC_t* m)
+int ff_cre_syncobj(BYTE drv, _SYNC_t *m)
 {
     char name[8];
     rt_mutex_t mutex;
@@ -770,7 +793,8 @@ int ff_del_syncobj(_SYNC_t m)
 
 int ff_req_grant(_SYNC_t m)
 {
-    if (rt_mutex_take(m, _FS_TIMEOUT) == RT_EOK) return RT_TRUE;
+    if (rt_mutex_take(m, _FS_TIMEOUT) == RT_EOK)
+		return RT_TRUE;
 
     return RT_FALSE;
 }
diff --git a/components/dfs/filesystems/nfs/dfs_nfs.c b/components/dfs/filesystems/nfs/dfs_nfs.c
index bf01607e5f..528d4d910e 100644
--- a/components/dfs/filesystems/nfs/dfs_nfs.c
+++ b/components/dfs/filesystems/nfs/dfs_nfs.c
@@ -1,3 +1,16 @@
+/*
+ * File      : dfs_nfs.c
+ * This file is part of Device File System in RT-Thread RTOS
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+ 
 #include <stdio.h>
 #include <rtthread.h>
 #include <dfs_fs.h>
@@ -43,27 +56,30 @@ struct nfs_filesystem
 };
 typedef struct nfs_file nfs_file;
 typedef struct nfs_dir nfs_dir;
-nfs_dir *nfs_opendir(struct nfs_filesystem* nfs, const char *path);
+nfs_dir *nfs_opendir(struct nfs_filesystem *nfs, const char *path);
 
-static int nfs_parse_host_export(const char* host_export, 
-	char* host, size_t host_len, 
-	char* export, size_t export_len)
+static int nfs_parse_host_export(const char *host_export, 
+	char *host, size_t host_len, 
+	char *export, size_t export_len)
 {
 	int index;
 
 	for (index = 0; index < host_len; index ++)
 	{
 		/* it's end of string, failed */
-		if (host_export[index] == 0) return -1;
+		if (host_export[index] == 0)
+			return -1;
 
 		/* copy to host buffer */
 		if (host_export[index] != ':')
 			host[index] = host_export[index];
-		else break;
+		else
+			break;
 	}
 
 	/* host buffer is not enough, failed */
-	if (index == host_len) return -1;
+	if (index == host_len)
+		return -1;
 
 	/* make RT_NULL */
 	host_len = index;
@@ -90,38 +106,38 @@ static void copy_handle(nfs_fh3 *dest, const nfs_fh3 *source)
 {
 	dest->data.data_len = source->data.data_len;
 	dest->data.data_val = rt_malloc(dest->data.data_len);
-	if(dest->data.data_val==RT_NULL)
+	if (dest->data.data_val == RT_NULL)
 	{
-		dest->data.data_len=0;
+		dest->data.data_len = 0;
 		return;
 	}
 
 	memcpy(dest->data.data_val, source->data.data_val, dest->data.data_len);
 }
 
-static nfs_fh3 *get_handle(struct nfs_filesystem* nfs, const char *name)
+static nfs_fh3 *get_handle(struct nfs_filesystem *nfs, const char *name)
 {
-	nfs_fh3 *handle=RT_NULL;
+	nfs_fh3 *handle = RT_NULL;
 	char *file;
 	char *path;
 	char *init;
 
 	init = path = rt_malloc(strlen(name)+1);
-	if(init==RT_NULL)
+	if (init == RT_NULL)
 		return RT_NULL;
 
 	memcpy(init, name, strlen(name)+1);
 
 	handle = rt_malloc(sizeof(nfs_fh3));
-	if(handle==RT_NULL)
+	if (handle == RT_NULL)
 	{
 		rt_free(init);
 		return RT_NULL;
 	}
 
-	if(path[0]=='/')
+	if (path[0] == '/')
 	{
-		path++;
+		path ++;
 		copy_handle(handle, &nfs->root_handle);
 	}
 	else
@@ -129,16 +145,16 @@ static nfs_fh3 *get_handle(struct nfs_filesystem* nfs, const char *name)
 		copy_handle(handle, &nfs->current_handle);
 	}
 
-	while((file=strtok_r(RT_NULL, "/", &path))!=RT_NULL)
+	while ((file = strtok_r(RT_NULL, "/", &path)) != RT_NULL)
 	{
 		LOOKUP3args args;
 		LOOKUP3res res;
 		memset(&res, 0, sizeof(res));
 		copy_handle(&args.what.dir, handle);
 		xdr_free((xdrproc_t)xdr_nfs_fh3, (char *)handle);
-		args.what.name=file;
+		args.what.name = file;
 
-		if(nfsproc3_lookup_3(args, &res, nfs->nfs_client)!=RPC_SUCCESS)
+		if (nfsproc3_lookup_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 		{
 			rt_kprintf("Lookup failed\n");
 			rt_free(init);
@@ -146,7 +162,7 @@ static nfs_fh3 *get_handle(struct nfs_filesystem* nfs, const char *name)
 			xdr_free((xdrproc_t)xdr_nfs_fh3, (char *)&args.what.dir);
 			return RT_NULL;
 		}
-		else if(res.status!=NFS3_OK)
+		else if (res.status != NFS3_OK)
 		{
 			rt_kprintf("Lookup failed: %d\n", res.status);
 			rt_free(init);
@@ -164,28 +180,28 @@ static nfs_fh3 *get_handle(struct nfs_filesystem* nfs, const char *name)
 	return handle;
 }
 
-static nfs_fh3 *get_dir_handle(struct nfs_filesystem* nfs, const char *name)
+static nfs_fh3 *get_dir_handle(struct nfs_filesystem *nfs, const char *name)
 {
-	nfs_fh3 *handle=RT_NULL;
+	nfs_fh3 *handle = RT_NULL;
 	char *file;
 	char *path;
 	char *init;
 
 	init = path = rt_malloc(strlen(name)+1);
-	if(init==RT_NULL)
+	if (init == RT_NULL)
 		return RT_NULL;
 	memcpy(init, name, strlen(name)+1);
 
 	handle = rt_malloc(sizeof(nfs_fh3));
-	if(handle == RT_NULL)
+	if (handle == RT_NULL)
 	{
 		rt_free(init);
 		return RT_NULL;
 	}
 
-	if(path[0]=='/')
+	if (path[0] == '/')
 	{
-		path++;
+		path ++;
 		copy_handle(handle, &nfs->root_handle);
 	}
 	else
@@ -193,16 +209,16 @@ static nfs_fh3 *get_dir_handle(struct nfs_filesystem* nfs, const char *name)
 		copy_handle(handle, &nfs->current_handle);
 	}
 
-	while((file=strtok_r(RT_NULL, "/", &path))!=RT_NULL && path[0]!='\0')
+	while ((file = strtok_r(RT_NULL, "/", &path)) != RT_NULL && path[0] != '\0')
 	{
 		LOOKUP3args args;
 		LOOKUP3res res;
 		memset(&res, 0, sizeof(res));
 		copy_handle(&args.what.dir, handle);
 		xdr_free((xdrproc_t)xdr_nfs_fh3, (char *)handle);
-		args.what.name=file;
+		args.what.name = file;
 
-		if(nfsproc3_lookup_3(args, &res, nfs->nfs_client)!=RPC_SUCCESS)
+		if (nfsproc3_lookup_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 		{
 			rt_kprintf("Lookup failed\n");
 			rt_free(init);
@@ -210,7 +226,7 @@ static nfs_fh3 *get_dir_handle(struct nfs_filesystem* nfs, const char *name)
 			xdr_free((xdrproc_t)xdr_nfs_fh3, (char *)&args.what.dir);
 			return RT_NULL;
 		}
-		else if(res.status!=NFS3_OK)
+		else if (res.status != NFS3_OK)
 		{
 			rt_kprintf("Lookup failed: %d\n", res.status);
 			rt_free(init);
@@ -228,7 +244,7 @@ static nfs_fh3 *get_dir_handle(struct nfs_filesystem* nfs, const char *name)
 	return handle;
 }
 
-static size_t nfs_get_filesize(struct nfs_filesystem* nfs, nfs_fh3 *handle)
+static size_t nfs_get_filesize(struct nfs_filesystem *nfs, nfs_fh3 *handle)
 {
 	GETATTR3args args;
 	GETATTR3res res;
@@ -246,14 +262,14 @@ static size_t nfs_get_filesize(struct nfs_filesystem* nfs, nfs_fh3 *handle)
 		return 0;
 	}
 
-	info=&res.GETATTR3res_u.resok.obj_attributes;
+	info = &res.GETATTR3res_u.resok.obj_attributes;
 	size = info->size;
 	xdr_free((xdrproc_t)xdr_GETATTR3res, (char *)&res);
 	
 	return size;
 }
 
-rt_bool_t nfs_is_directory(struct nfs_filesystem* nfs, const char* name)
+rt_bool_t nfs_is_directory(struct nfs_filesystem *nfs, const char *name)
 {
 	GETATTR3args args;
 	GETATTR3res res;
@@ -263,18 +279,19 @@ rt_bool_t nfs_is_directory(struct nfs_filesystem* nfs, const char* name)
 
 	result = RT_FALSE;
 	handle = get_handle(nfs, name);
-	if(handle == RT_NULL) return RT_FALSE;
+	if (handle == RT_NULL)
+		return RT_FALSE;
 
 	args.object = *handle;
 
 	memset(&res, '\0', sizeof(res));
 
-	if (nfsproc3_getattr_3(args, &res, nfs->nfs_client)!=RPC_SUCCESS)
+	if (nfsproc3_getattr_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 	{
 		rt_kprintf("GetAttr failed\n");
 		return RT_FALSE;
 	}
-	else if(res.status!=NFS3_OK)
+	else if (res.status != NFS3_OK)
 	{
 		rt_kprintf("Getattr failed: %d\n", res.status);
 		return RT_FALSE;
@@ -282,7 +299,8 @@ rt_bool_t nfs_is_directory(struct nfs_filesystem* nfs, const char* name)
 
 	info=&res.GETATTR3res_u.resok.obj_attributes;
 
-	if (info->type == NFS3DIR) result = RT_TRUE;
+	if (info->type == NFS3DIR)
+		result = RT_TRUE;
 
 	xdr_free((xdrproc_t)xdr_GETATTR3res, (char *)&res);
 	xdr_free((xdrproc_t)xdr_nfs_fh3, (char *)handle);
@@ -291,47 +309,47 @@ rt_bool_t nfs_is_directory(struct nfs_filesystem* nfs, const char* name)
 	return result;
 }
 
-int nfs_create(struct nfs_filesystem* nfs, const char *name, mode_t mode)
+int nfs_create(struct nfs_filesystem *nfs, const char *name, mode_t mode)
 {
 	CREATE3args args;
 	CREATE3res res;
-	int ret=0;
+	int ret = 0;
 	nfs_fh3 *handle;
 
-	if(nfs->nfs_client==RT_NULL)
+	if (nfs->nfs_client == RT_NULL)
 	{
 		return -1;
 	}
 
-	handle=get_dir_handle(nfs, name);
-	if(handle==RT_NULL)
+	handle = get_dir_handle(nfs, name);
+	if (handle == RT_NULL)
 	{
 		return -1;
 	}
-	args.where.dir=*handle;
-	args.where.name=strrchr(name, '/') + 1;
-	if(args.where.name==RT_NULL)
+	args.where.dir = *handle;
+	args.where.name = strrchr(name, '/') + 1;
+	if (args.where.name == RT_NULL)
 	{
-		args.where.name=(char *)name;
+		args.where.name = (char *)name;
 	}
-	args.how.mode=GUARDED;
+	args.how.mode = GUARDED;
 
-	args.how.createhow3_u.obj_attributes.mode.set_it=TRUE;
-	args.how.createhow3_u.obj_attributes.mode.set_mode3_u.mode=mode;
-	args.how.createhow3_u.obj_attributes.uid.set_it=FALSE;
-	args.how.createhow3_u.obj_attributes.gid.set_it=FALSE;
-	args.how.createhow3_u.obj_attributes.size.set_it=FALSE;
-	args.how.createhow3_u.obj_attributes.atime.set_it=DONT_CHANGE;
-	args.how.createhow3_u.obj_attributes.mtime.set_it=DONT_CHANGE;
+	args.how.createhow3_u.obj_attributes.mode.set_it = TRUE;
+	args.how.createhow3_u.obj_attributes.mode.set_mode3_u.mode = mode;
+	args.how.createhow3_u.obj_attributes.uid.set_it = FALSE;
+	args.how.createhow3_u.obj_attributes.gid.set_it = FALSE;
+	args.how.createhow3_u.obj_attributes.size.set_it = FALSE;
+	args.how.createhow3_u.obj_attributes.atime.set_it = DONT_CHANGE;
+	args.how.createhow3_u.obj_attributes.mtime.set_it = DONT_CHANGE;
 
 	memset(&res, 0, sizeof(res));
 
-	if(nfsproc3_create_3(args, &res, nfs->nfs_client)!=RPC_SUCCESS)
+	if (nfsproc3_create_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 	{
 		rt_kprintf("Create failed\n");
 		ret = -1;
 	}
-	else if(res.status!=NFS3_OK)
+	else if (res.status != NFS3_OK)
 	{
 		rt_kprintf("Create failed: %d\n", res.status);
 		ret = -1;
@@ -343,46 +361,46 @@ int nfs_create(struct nfs_filesystem* nfs, const char *name, mode_t mode)
 	return ret;
 }
 
-int nfs_mkdir(struct nfs_filesystem* nfs, const char *name, mode_t mode)
+int nfs_mkdir(struct nfs_filesystem *nfs, const char *name, mode_t mode)
 {
 	MKDIR3args args;
 	MKDIR3res res;
-	int ret=0;
+	int ret = 0;
 	nfs_fh3 *handle;
 
-	if(nfs->nfs_client==RT_NULL)
+	if (nfs->nfs_client == RT_NULL)
 		return -1;
 
-	handle=get_dir_handle(nfs, name);
-	if(handle==RT_NULL)
+	handle = get_dir_handle(nfs, name);
+	if (handle == RT_NULL)
 		return -1;
 
-	args.where.dir=*handle;
-	args.where.name=strrchr(name, '/') + 1;
-	if(args.where.name==RT_NULL)
+	args.where.dir = *handle;
+	args.where.name = strrchr(name, '/') + 1;
+	if (args.where.name == RT_NULL)
 	{
-		args.where.name=(char *)name;
+		args.where.name = (char *)name;
 	}
 
-	args.attributes.mode.set_it=TRUE;
-	args.attributes.mode.set_mode3_u.mode=mode;
-	args.attributes.uid.set_it=FALSE;
-	args.attributes.gid.set_it=FALSE;
-	args.attributes.size.set_it=FALSE;
-	args.attributes.atime.set_it=DONT_CHANGE;
-	args.attributes.mtime.set_it=DONT_CHANGE;
+	args.attributes.mode.set_it = TRUE;
+	args.attributes.mode.set_mode3_u.mode = mode;
+	args.attributes.uid.set_it = FALSE;
+	args.attributes.gid.set_it = FALSE;
+	args.attributes.size.set_it = FALSE;
+	args.attributes.atime.set_it = DONT_CHANGE;
+	args.attributes.mtime.set_it = DONT_CHANGE;
 
 	memset(&res, 0, sizeof(res));
 
-	if(nfsproc3_mkdir_3(args, &res, nfs->nfs_client)!=RPC_SUCCESS)
+	if (nfsproc3_mkdir_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 	{
 		rt_kprintf("Mkdir failed\n");
-		ret=-1;
+		ret = -1;
 	}
-	else if(res.status!=NFS3_OK)
+	else if (res.status != NFS3_OK)
 	{
 		rt_kprintf("Mkdir failed: %d\n", res.status);
-		ret=-1;
+		ret = -1;
 	}
 	xdr_free((xdrproc_t)xdr_MKDIR3res, (char *)&res);
 	xdr_free((xdrproc_t)xdr_nfs_fh3, (char *)handle);
@@ -392,15 +410,15 @@ int nfs_mkdir(struct nfs_filesystem* nfs, const char *name, mode_t mode)
 }
 
 /* mount(RT_NULL, "/mnt", "nfs", 0, "192.168.1.1:/export") */
-int nfs_mount(struct dfs_filesystem* fs, unsigned long rwflag, const void* data)
+int nfs_mount(struct dfs_filesystem *fs, unsigned long rwflag, const void *data)
 {
 	mountres3 res;
-	struct nfs_filesystem* nfs;
+	struct nfs_filesystem *nfs;
 
-	nfs = (struct nfs_filesystem*)rt_malloc(sizeof(struct nfs_filesystem));
+	nfs = (struct nfs_filesystem *)rt_malloc(sizeof(struct nfs_filesystem));
 	memset(nfs, 0, sizeof(struct nfs_filesystem));
 
-	if (nfs_parse_host_export((const char*)data, nfs->host, HOST_LENGTH,
+	if (nfs_parse_host_export((const char *)data, nfs->host, HOST_LENGTH,
 		nfs->export, EXPORT_PATH_LENGTH) < 0)
 	{
 		rt_kprintf("host or export path error\n");
@@ -408,25 +426,25 @@ int nfs_mount(struct dfs_filesystem* fs, unsigned long rwflag, const void* data)
 	}
 
 	nfs->mount_client=clnt_create((char *)nfs->host, MOUNT_PROGRAM, MOUNT_V3, "udp");
-	if(nfs->mount_client==RT_NULL)
+	if (nfs->mount_client == RT_NULL)
 	{
 		rt_kprintf("create mount client failed\n");
 		goto __return;
 	}
 
 	memset(&res, '\0', sizeof(mountres3));
-	if(mountproc3_mnt_3((char *)nfs->export, &res, nfs->mount_client)!=RPC_SUCCESS)
+	if (mountproc3_mnt_3((char *)nfs->export, &res, nfs->mount_client) != RPC_SUCCESS)
 	{
 		rt_kprintf("nfs mount failed\n");
 		goto __return;
 	}
-	else if(res.fhs_status!=MNT3_OK)
+	else if (res.fhs_status != MNT3_OK)
 	{
 		rt_kprintf("nfs mount failed\n");
 		goto __return;
 	}
 	nfs->nfs_client=clnt_create((char *)nfs->host, NFS_PROGRAM, NFS_V3, "udp");
-	if(nfs->nfs_client == RT_NULL)
+	if (nfs->nfs_client == RT_NULL)
 	{
 		rt_kprintf("creat nfs client failed\n");
 		goto __return;
@@ -434,7 +452,7 @@ int nfs_mount(struct dfs_filesystem* fs, unsigned long rwflag, const void* data)
 	copy_handle(&nfs->root_handle, (nfs_fh3 *)&res.mountres3_u.mountinfo.fhandle);
 	copy_handle(&nfs->current_handle, &nfs->root_handle);
 
-	nfs->nfs_client->cl_auth=authnone_create();
+	nfs->nfs_client->cl_auth = authnone_create();
 	fs->data = nfs;
 
 	return 0;
@@ -460,9 +478,9 @@ __return:
 	return -1;
 }
 
-int nfs_unmount(struct dfs_filesystem* fs)
+int nfs_unmount(struct dfs_filesystem *fs)
 {
-	struct nfs_filesystem* nfs;
+	struct nfs_filesystem *nfs;
 
 	RT_ASSERT(fs != RT_NULL);
 	RT_ASSERT(fs->data != RT_NULL);
@@ -476,9 +494,9 @@ int nfs_unmount(struct dfs_filesystem* fs)
 	}
 
 	/* destroy nfs client */
-	if(nfs->nfs_client != RT_NULL)
+	if (nfs->nfs_client != RT_NULL)
 	{
-		if(nfs->nfs_client->cl_auth!=RT_NULL)
+		if (nfs->nfs_client->cl_auth != RT_NULL)
 		{
 			auth_destroy(nfs->nfs_client->cl_auth);
 			nfs->nfs_client->cl_auth = RT_NULL;
@@ -488,15 +506,15 @@ int nfs_unmount(struct dfs_filesystem* fs)
 	}
 
 	/* destroy mount client */
-	if(nfs->mount_client != RT_NULL)
+	if (nfs->mount_client != RT_NULL)
 	{
-		if(nfs->mount_client->cl_auth != RT_NULL)
+		if (nfs->mount_client->cl_auth != RT_NULL)
 		{
 			auth_destroy(nfs->mount_client->cl_auth);
 			nfs->mount_client->cl_auth = RT_NULL;
 		}
 		clnt_destroy(nfs->mount_client);
-		nfs->mount_client=RT_NULL;
+		nfs->mount_client = RT_NULL;
 	}
 
 	rt_free(nfs);
@@ -505,18 +523,18 @@ int nfs_unmount(struct dfs_filesystem* fs)
 	return 0;
 }
 
-int nfs_ioctl(struct dfs_fd* file, int cmd,	void* args)
+int nfs_ioctl(struct dfs_fd *file, int cmd,	void *args)
 {
 	return -DFS_STATUS_ENOSYS;
 }
 
-int nfs_read(struct dfs_fd* file, void *buf, rt_size_t count)
+int nfs_read(struct dfs_fd *file, void *buf, rt_size_t count)
 {
 	READ3args args;
 	READ3res res;
 	ssize_t bytes;
 	nfs_file *fd;
-	struct nfs_filesystem* nfs;
+	struct nfs_filesystem *nfs;
 
 	if (file->type == FT_DIRECTORY)
 		return -DFS_STATUS_EISDIR;
@@ -527,35 +545,36 @@ int nfs_read(struct dfs_fd* file, void *buf, rt_size_t count)
 	RT_ASSERT(file->fs->data != RT_NULL);
 	nfs = (struct nfs_filesystem *)file->fs->data;
 
-	if(nfs->nfs_client==RT_NULL)
+	if (nfs->nfs_client == RT_NULL)
 		return -1;
 
 	/* end of file */
-	if (fd->eof == TRUE) return 0;
+	if (fd->eof == TRUE)
+		return 0;
 
-	args.file=fd->handle;
-	args.offset=fd->offset;
-	args.count=count;
+	args.file = fd->handle;
+	args.offset = fd->offset;
+	args.count = count;
 
 	memset(&res, 0, sizeof(res));
-	if(nfsproc3_read_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
+	if (nfsproc3_read_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 	{
 		rt_kprintf("Read failed\n");
 		bytes = 0;
 	}
-	else if(res.status!=NFS3_OK)
+	else if (res.status != NFS3_OK)
 	{
 		rt_kprintf("Read failed: %d\n", res.status);
 		bytes = 0;
 	}
 	else
 	{
-		if(res.READ3res_u.resok.eof)
+		if (res.READ3res_u.resok.eof)
 		{
 			/* something should probably be here */
 			fd->eof = TRUE;
 		}
-		bytes=res.READ3res_u.resok.count;
+		bytes = res.READ3res_u.resok.count;
 		fd->offset += bytes;
 		/* update current position */
 		file->pos = fd->offset;
@@ -566,13 +585,13 @@ int nfs_read(struct dfs_fd* file, void *buf, rt_size_t count)
 	return bytes;
 }
 
-int nfs_write(struct dfs_fd* file, const void *buf, rt_size_t count)
+int nfs_write(struct dfs_fd *file, const void *buf, rt_size_t count)
 {
 	WRITE3args args;
 	WRITE3res res;
 	ssize_t bytes;
 	nfs_file *fd;
-	struct nfs_filesystem* nfs;
+	struct nfs_filesystem *nfs;
 
 	if (file->type == FT_DIRECTORY)
 		return -DFS_STATUS_EISDIR;
@@ -583,31 +602,31 @@ int nfs_write(struct dfs_fd* file, const void *buf, rt_size_t count)
 	RT_ASSERT(file->fs->data != RT_NULL);
 	nfs = (struct nfs_filesystem *)file->fs->data;
 
-	if(nfs->nfs_client==RT_NULL)
+	if (nfs->nfs_client == RT_NULL)
 		return -1;
 
-	args.file=fd->handle;
-	args.stable=FILE_SYNC;
-	args.offset=fd->offset;
+	args.file = fd->handle;
+	args.stable = FILE_SYNC;
+	args.offset = fd->offset;
 
 	memset(&res, 0, sizeof(res));
 	args.data.data_val=(void *)buf;
-	args.count=args.data.data_len=count;
+	args.count=args.data.data_len = count;
 
-	if(nfsproc3_write_3(args, &res, nfs->nfs_client)!=RPC_SUCCESS)
+	if (nfsproc3_write_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 	{
 		rt_kprintf("Write failed\n");
 		bytes = 0;
 	}
-	else if(res.status!=NFS3_OK)
+	else if (res.status != NFS3_OK)
 	{
 		rt_kprintf("Write failed: %d\n", res.status);
 		bytes = 0;
 	}
 	else
 	{
-		bytes=res.WRITE3res_u.resok.count;
-		fd->offset+=bytes;
+		bytes = res.WRITE3res_u.resok.count;
+		fd->offset += bytes;
 		/* update current position */
 		file->pos = fd->offset;
 		/* todo: update file size */
@@ -617,7 +636,7 @@ int nfs_write(struct dfs_fd* file, const void *buf, rt_size_t count)
 	return bytes;
 }
 
-int nfs_lseek(struct dfs_fd* file, rt_off_t offset)
+int nfs_lseek(struct dfs_fd *file, rt_off_t offset)
 {
 	nfs_file *fd;
 
@@ -636,22 +655,22 @@ int nfs_lseek(struct dfs_fd* file, rt_off_t offset)
 	return -DFS_STATUS_EIO;
 }
 
-int nfs_close(struct dfs_fd* file)
+int nfs_close(struct dfs_fd *file)
 {
 	if (file->type == FT_DIRECTORY)
 	{
-		struct nfs_dir* dir;
+		struct nfs_dir *dir;
 
-		dir = (struct nfs_dir*)file->data;
+		dir = (struct nfs_dir *)file->data;
 		xdr_free((xdrproc_t)xdr_nfs_fh3, (char *)&dir->handle);
 		xdr_free((xdrproc_t)xdr_READDIR3res, (char *)&dir->res);
 		rt_free(dir);
 	}
 	else if (file->type == FT_REGULAR)
 	{
-		struct nfs_file* fd;
+		struct nfs_file *fd;
 
-		fd = (struct nfs_file*)file->data;
+		fd = (struct nfs_file *)file->data;
 
 		xdr_free((xdrproc_t)xdr_nfs_fh3, (char *)&fd->handle);
 		rt_free(fd);
@@ -661,9 +680,9 @@ int nfs_close(struct dfs_fd* file)
 	return 0;
 }
 
-int nfs_open(struct dfs_fd* file)
+int nfs_open(struct dfs_fd *file)
 {
-	struct nfs_filesystem* nfs;
+	struct nfs_filesystem *nfs;
 
 	RT_ASSERT(file->fs != RT_NULL);
 	RT_ASSERT(file->fs->data != RT_NULL);
@@ -695,12 +714,12 @@ int nfs_open(struct dfs_fd* file)
 		}
 
 		/* open file (get file handle ) */
-		fp=rt_malloc(sizeof(nfs_file));
-		if(fp == RT_NULL)
+		fp = rt_malloc(sizeof(nfs_file));
+		if (fp == RT_NULL)
 			return -1;
 
 		handle = get_handle(nfs, file->path);
-		if(handle == RT_NULL)
+		if (handle == RT_NULL)
 		{
 			rt_free(fp);
 			return -1;
@@ -708,7 +727,7 @@ int nfs_open(struct dfs_fd* file)
 
 		/* get size of file */
 		fp->size = nfs_get_filesize(nfs, handle);
-		fp->offset=0;
+		fp->offset = 0;
 		fp->eof = FALSE;
 
 		copy_handle(&fp->handle, handle);
@@ -727,32 +746,32 @@ int nfs_open(struct dfs_fd* file)
 	return 0;
 }
 
-int nfs_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)
+int nfs_stat(struct dfs_filesystem *fs, const char *path, struct stat *st)
 {
 	GETATTR3args args;
 	GETATTR3res res;
 	fattr3 *info;
 	nfs_fh3 *handle;
-	struct nfs_filesystem* nfs;
+	struct nfs_filesystem *nfs;
 
 	RT_ASSERT(fs != RT_NULL);
 	RT_ASSERT(fs->data != RT_NULL);
 	nfs = (struct nfs_filesystem *)fs->data;
 
 	handle = get_handle(nfs, path);
-	if(handle == RT_NULL)
+	if (handle == RT_NULL)
 		return -1;
 
 	args.object = *handle;
 
 	memset(&res, '\0', sizeof(res));
 
-	if (nfsproc3_getattr_3(args, &res, nfs->nfs_client)!=RPC_SUCCESS)
+	if (nfsproc3_getattr_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 	{
 		rt_kprintf("GetAttr failed\n");
 		return -1;
 	}
-	else if(res.status!=NFS3_OK)
+	else if (res.status != NFS3_OK)
 	{
 		rt_kprintf("Getattr failed: %d\n", res.status);
 		return -1;
@@ -760,7 +779,7 @@ int nfs_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)
 
 	info = &res.GETATTR3res_u.resok.obj_attributes;
 
-	st->st_dev   = 0;
+	st->st_dev = 0;
 
 	st->st_mode = DFS_S_IFREG | DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |
 	DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH;
@@ -781,19 +800,19 @@ int nfs_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)
 	return 0;
 }
 
-nfs_dir *nfs_opendir(struct nfs_filesystem* nfs, const char *path)
+nfs_dir *nfs_opendir(struct nfs_filesystem *nfs, const char *path)
 {
 	nfs_dir *dir;
 	nfs_fh3 *handle;
 
-	dir=rt_malloc(sizeof(nfs_dir));
-	if(dir==RT_NULL)
+	dir = rt_malloc(sizeof(nfs_dir));
+	if (dir == RT_NULL)
 	{
 		return RT_NULL;
 	}
 
 	handle = get_handle(nfs, path);
-	if(handle == RT_NULL)
+	if (handle == RT_NULL)
 	{
 		rt_free(dir);
 		return RT_NULL;
@@ -803,63 +822,63 @@ nfs_dir *nfs_opendir(struct nfs_filesystem* nfs, const char *path)
 	xdr_free((xdrproc_t)xdr_nfs_fh3, (char *)handle);
 	rt_free(handle);
 
-	dir->cookie=0;
+	dir->cookie = 0;
 	memset(&dir->cookieverf, '\0', sizeof(cookieverf3));
-	dir->entry=RT_NULL;
-	dir->eof=FALSE;
+	dir->entry = RT_NULL;
+	dir->eof = FALSE;
 	memset(&dir->res, '\0', sizeof(dir->res));
 
 	return dir;
 }
 
-char *nfs_readdir(struct nfs_filesystem* nfs, nfs_dir *dir)
+char *nfs_readdir(struct nfs_filesystem *nfs, nfs_dir *dir)
 {
 	static char name[NAME_MAX];
 
-	if(nfs->nfs_client==RT_NULL || dir == RT_NULL)
+	if (nfs->nfs_client == RT_NULL || dir == RT_NULL)
 		return RT_NULL;
 
-	if(dir->entry==RT_NULL)
+	if (dir->entry == RT_NULL)
 	{
 		READDIR3args args;
 
 		xdr_free((xdrproc_t)xdr_READDIR3res, (char *)&dir->res);
 		memset(&dir->res, '\0', sizeof(dir->res));
 
-		args.dir=dir->handle;
-		args.cookie=dir->cookie;
+		args.dir = dir->handle;
+		args.cookie = dir->cookie;
 		memcpy(&args.cookieverf, &dir->cookieverf, sizeof(cookieverf3));
-		args.count=1024;
+		args.count = 1024;
 
-		if(nfsproc3_readdir_3(args, &dir->res, nfs->nfs_client)!=RPC_SUCCESS)
+		if (nfsproc3_readdir_3(args, &dir->res, nfs->nfs_client) != RPC_SUCCESS)
 		{
 			rt_kprintf("Readdir failed\n");
 			return RT_NULL;
 		}
-		else if(dir->res.status!=NFS3_OK)
+		else if (dir->res.status != NFS3_OK)
 		{
 			rt_kprintf("Readdir failed: %d\n", dir->res.status);
 			return RT_NULL;
 		}
 
 		memcpy(&dir->cookieverf, &dir->res.READDIR3res_u.resok.cookieverf, sizeof(cookieverf3));
-		dir->eof=dir->res.READDIR3res_u.resok.reply.eof;
-		dir->entry=dir->res.READDIR3res_u.resok.reply.entries;
+		dir->eof = dir->res.READDIR3res_u.resok.reply.eof;
+		dir->entry = dir->res.READDIR3res_u.resok.reply.entries;
 	}
-	if(dir->eof==TRUE && dir->entry==RT_NULL)
+	if (dir->eof == TRUE && dir->entry == RT_NULL)
 		return RT_NULL;
 
-	dir->cookie=dir->entry->cookie;
+	dir->cookie = dir->entry->cookie;
 	strncpy(name, dir->entry->name, NAME_MAX-1);
-	dir->entry=dir->entry->nextentry;
-	name[NAME_MAX - 1]='\0';
+	dir->entry = dir->entry->nextentry;
+	name[NAME_MAX - 1] = '\0';
 	return name;
 }
 
-int nfs_unlink(struct dfs_filesystem* fs, const char* path)
+int nfs_unlink(struct dfs_filesystem *fs, const char *path)
 {
 	int ret = 0;
-	struct nfs_filesystem* nfs;
+	struct nfs_filesystem *nfs;
 
 	RT_ASSERT(fs != RT_NULL);
 	RT_ASSERT(fs->data != RT_NULL);
@@ -873,26 +892,27 @@ int nfs_unlink(struct dfs_filesystem* fs, const char* path)
 		nfs_fh3 *handle;
 
 		handle = get_dir_handle(nfs, path);
-		if(handle == RT_NULL) return -1;
+		if (handle == RT_NULL)
+			return -1;
 
-		args.object.dir=*handle;
-		args.object.name=strrchr(path, '/') + 1;
-		if(args.object.name==RT_NULL)
+		args.object.dir = *handle;
+		args.object.name = strrchr(path, '/') + 1;
+		if (args.object.name == RT_NULL)
 		{
-			args.object.name=(char *)path;
+			args.object.name = (char *)path;
 		}
 
 		memset(&res, 0, sizeof(res));
 
-		if(nfsproc3_remove_3(args, &res, nfs->nfs_client)!=RPC_SUCCESS)
+		if (nfsproc3_remove_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 		{
 			rt_kprintf("Remove failed\n");
-			ret=-1;
+			ret = -1;
 		}
-		else if(res.status!=NFS3_OK)
+		else if (res.status != NFS3_OK)
 		{
 			rt_kprintf("Remove failed: %d\n", res.status);
-			ret=-1;
+			ret = -1;
 		}
 		xdr_free((xdrproc_t)xdr_REMOVE3res, (char *)&res);
 		xdr_free((xdrproc_t)xdr_nfs_fh3, (char *)handle);
@@ -905,24 +925,25 @@ int nfs_unlink(struct dfs_filesystem* fs, const char* path)
 		RMDIR3res res;
 		nfs_fh3 *handle;
 
-		handle=get_dir_handle(nfs, path);
-		if(handle==RT_NULL) return -1;
+		handle = get_dir_handle(nfs, path);
+		if (handle == RT_NULL)
+			return -1;
 
-		args.object.dir=*handle;
-		args.object.name=strrchr(path, '/') + 1;
-		if(args.object.name==RT_NULL)
+		args.object.dir = *handle;
+		args.object.name = strrchr(path, '/') + 1;
+		if (args.object.name == RT_NULL)
 		{
-			args.object.name=(char *)path;
+			args.object.name = (char *)path;
 		}
 
 		memset(&res, 0, sizeof(res));
 
-		if(nfsproc3_rmdir_3(args, &res, nfs->nfs_client)!=RPC_SUCCESS)
+		if (nfsproc3_rmdir_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 		{
 			rt_kprintf("Rmdir failed\n");
 			ret = -1;
 		}
-		else if(res.status!=NFS3_OK)
+		else if (res.status != NFS3_OK)
 		{
 			rt_kprintf("Rmdir failed: %d\n", res.status);
 			ret = -1;
@@ -936,48 +957,48 @@ int nfs_unlink(struct dfs_filesystem* fs, const char* path)
 	return ret;
 }
 
-int nfs_rename(struct dfs_filesystem* fs, const char *src, const char *dest)
+int nfs_rename(struct dfs_filesystem *fs, const char *src, const char *dest)
 {
 	RENAME3args args;
 	RENAME3res res;
 	nfs_fh3 *sHandle;
 	nfs_fh3 *dHandle;
-	int ret=0;
-	struct nfs_filesystem* nfs;
+	int ret = 0;
+	struct nfs_filesystem *nfs;
 
 	RT_ASSERT(fs != RT_NULL);
 	RT_ASSERT(fs->data != RT_NULL);
 	nfs = (struct nfs_filesystem *)fs->data;
 
-	if(nfs->nfs_client==RT_NULL)
+	if (nfs->nfs_client == RT_NULL)
 		return -1;
 
-	sHandle=get_dir_handle(nfs, src);
-	if(sHandle==RT_NULL)
+	sHandle = get_dir_handle(nfs, src);
+	if (sHandle == RT_NULL)
 		return -1;
 
-	dHandle=get_dir_handle(nfs, dest);
-	if(dHandle==RT_NULL)
+	dHandle = get_dir_handle(nfs, dest);
+	if (dHandle == RT_NULL)
 		return -1;
 
-	args.from.dir=*sHandle;
-	args.from.name=strrchr(src, '/') + 1;
-	if(args.from.name==RT_NULL)
-		args.from.name=(char *)src;
+	args.from.dir = *sHandle;
+	args.from.name = strrchr(src, '/') + 1;
+	if (args.from.name == RT_NULL)
+		args.from.name = (char *)src;
 
-	args.to.dir=*dHandle;
-	args.to.name=strrchr(src, '/') + 1;
-	if(args.to.name==RT_NULL)
-		args.to.name=(char *)dest;
+	args.to.dir = *dHandle;
+	args.to.name = strrchr(src, '/') + 1;
+	if (args.to.name == RT_NULL)
+		args.to.name = (char *)dest;
 
 	memset(&res, '\0', sizeof(res));
 
-	if(nfsproc3_rename_3(args, &res, nfs->nfs_client)!=RPC_SUCCESS)
+	if (nfsproc3_rename_3(args, &res, nfs->nfs_client) != RPC_SUCCESS)
 	{
 		rt_kprintf("Rename failed\n");
 		ret = -1;
 	}
-	else if(res.status!=NFS3_OK)
+	else if (res.status != NFS3_OK)
 	{
 		rt_kprintf("Rename failed: %d\n", res.status);
 		ret = -1;
@@ -989,12 +1010,12 @@ int nfs_rename(struct dfs_filesystem* fs, const char *src, const char *dest)
 	return ret;
 }
 
-int nfs_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count)
+int nfs_getdents(struct dfs_fd *file, struct dirent *dirp, rt_uint32_t count)
 {
 	nfs_dir *dir;
 	rt_uint32_t index;
-	struct dirent* d;
-	struct nfs_filesystem* nfs;
+	struct dirent *d;
+	struct nfs_filesystem *nfs;
 	char *name;
 
 	dir = (nfs_dir *)(file->data);
@@ -1005,7 +1026,8 @@ int nfs_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count)
 
 	/* make integer count */
 	count = (count / sizeof(struct dirent)) * sizeof(struct dirent);
-	if ( count == 0 ) return -DFS_STATUS_EINVAL;
+	if (count == 0)
+		return -DFS_STATUS_EINVAL;
 
 	index = 0;
 	while (1)
@@ -1015,7 +1037,8 @@ int nfs_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count)
 		d = dirp + index;
 
 		name = nfs_readdir(nfs, dir);
-		if (name == RT_NULL) break;
+		if (name == RT_NULL)
+			break;
 
 		d->d_type = DFS_DT_REG;
 
@@ -1024,7 +1047,7 @@ int nfs_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count)
 		rt_strncpy(d->d_name, name, rt_strlen(name) + 1);
 
 		index ++;
-		if ( index * sizeof(struct dirent) >= count )
+		if (index * sizeof(struct dirent) >= count)
 			break;
 	}
 
diff --git a/components/dfs/filesystems/nfs/dfs_nfs.h b/components/dfs/filesystems/nfs/dfs_nfs.h
index 843b6b9ddc..d45af577de 100644
--- a/components/dfs/filesystems/nfs/dfs_nfs.h
+++ b/components/dfs/filesystems/nfs/dfs_nfs.h
@@ -1,3 +1,16 @@
+/*
+ * File      : dfs_nfs.h
+ * This file is part of Device File System in RT-Thread RTOS
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
 #ifndef __NFS_H__
 #define __NFS_H__
 
diff --git a/components/dfs/filesystems/romfs/dfs_romfs.c b/components/dfs/filesystems/romfs/dfs_romfs.c
index b5effaf81c..760593b58c 100644
--- a/components/dfs/filesystems/romfs/dfs_romfs.c
+++ b/components/dfs/filesystems/romfs/dfs_romfs.c
@@ -1,35 +1,49 @@
+/*

+ * File      : dfs_romfs.c

+ * This file is part of Device File System in RT-Thread RTOS

+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team

+ *

+ * The license and distribution terms for this file may be

+ * found in the file LICENSE in this distribution or at

+ * http://www.rt-thread.org/license/LICENSE.

+ *

+ * Change Logs:

+ * Date           Author       Notes

+ */

+

 #include <rtthread.h>

 #include <dfs.h>

 #include <dfs_fs.h>

 #include "dfs_romfs.h"

 

-int dfs_romfs_mount(struct dfs_filesystem* fs, unsigned long rwflag, const void* data)

+int dfs_romfs_mount(struct dfs_filesystem *fs, unsigned long rwflag, const void *data)

 {

-	struct romfs_dirent* root_dirent;

+	struct romfs_dirent *root_dirent;

 

-	if (data == RT_NULL) return -DFS_STATUS_EIO;

+	if (data == RT_NULL)

+		return -DFS_STATUS_EIO;

 

-	root_dirent = (struct romfs_dirent*)data;

+	root_dirent = (struct romfs_dirent *)data;

 	fs->data = root_dirent;

 

 	return DFS_STATUS_OK;

 }

 

-int dfs_romfs_unmount(struct dfs_filesystem* fs)

+int dfs_romfs_unmount(struct dfs_filesystem *fs)

 {

 	return DFS_STATUS_OK;

 }

 

-int dfs_romfs_ioctl(struct dfs_fd* file, int cmd,	void* args)

+int dfs_romfs_ioctl(struct dfs_fd *file, int cmd, void *args)

 {

 	return -DFS_STATUS_EIO;

 }

 

-struct romfs_dirent* dfs_romfs_lookup(struct romfs_dirent* root_dirent, const char* path, rt_size_t *size)

+struct romfs_dirent *dfs_romfs_lookup(struct romfs_dirent *root_dirent, const char *path, rt_size_t *size)

 {

 	rt_size_t index, found;

 	const char *subpath, *subpath_end;

-	struct romfs_dirent* dirent;

+	struct romfs_dirent *dirent;

 	rt_size_t dirent_size;

 

 	if (path[0] == '/' && path[1] == '\0') 

@@ -39,15 +53,17 @@ struct romfs_dirent* dfs_romfs_lookup(struct romfs_dirent* root_dirent, const ch
 	}

 

 	/* goto root directy entries */

-	dirent = (struct romfs_dirent*)root_dirent->data;

+	dirent = (struct romfs_dirent *)root_dirent->data;

 	dirent_size = root_dirent->size;

 

 	/* get the end position of this subpath */

 	subpath_end = path;

 	/* skip /// */

-	while (*subpath_end && *subpath_end == '/') subpath_end ++;

+	while (*subpath_end && *subpath_end == '/')

+		subpath_end ++;

 	subpath = subpath_end;

-	while ((*subpath_end != '/') && *subpath_end) subpath_end ++;

+	while ((*subpath_end != '/') && *subpath_end)

+		subpath_end ++;

 

 	while (dirent != RT_NULL)

 	{

@@ -61,9 +77,11 @@ struct romfs_dirent* dfs_romfs_lookup(struct romfs_dirent* root_dirent, const ch
 				dirent_size = dirent[index].size;

 

 				/* skip /// */

-				while (*subpath_end && *subpath_end == '/') subpath_end ++;

+				while (*subpath_end && *subpath_end == '/')

+					subpath_end ++;

 				subpath = subpath_end;

-				while ((*subpath_end != '/') && *subpath_end) subpath_end ++;

+				while ((*subpath_end != '/') && *subpath_end)

+					subpath_end ++;

 

 				if (!(*subpath))

 				{

@@ -81,24 +99,26 @@ struct romfs_dirent* dfs_romfs_lookup(struct romfs_dirent* root_dirent, const ch
 				else 

 				{

 					/* return file dirent */

-					if (subpath != RT_NULL) break; /* not the end of path */

+					if (subpath != RT_NULL)

+						break; /* not the end of path */

 					

 					return &dirent[index];

 				}

 			}

 		}

 

-		if (!found) break; /* not found */

+		if (!found)

+			break; /* not found */

 	}

 

 	/* not found */

 	return RT_NULL;

 }

 

-int dfs_romfs_read(struct dfs_fd* file, void *buf, rt_size_t count)

+int dfs_romfs_read(struct dfs_fd *file, void *buf, rt_size_t count)

 {

 	rt_size_t length;

-	struct romfs_dirent* dirent;

+	struct romfs_dirent *dirent;

 

 	dirent = (struct romfs_dirent *)file->data;

 	RT_ASSERT(dirent != RT_NULL);

@@ -117,7 +137,7 @@ int dfs_romfs_read(struct dfs_fd* file, void *buf, rt_size_t count)
 	return length;

 }

 

-int dfs_romfs_lseek(struct dfs_fd* file, rt_off_t offset)

+int dfs_romfs_lseek(struct dfs_fd *file, rt_off_t offset)

 {

 	if (offset <= file->size)

 	{

@@ -128,30 +148,31 @@ int dfs_romfs_lseek(struct dfs_fd* file, rt_off_t offset)
 	return -DFS_STATUS_EIO;

 }

 

-int dfs_romfs_close(struct dfs_fd* file)

+int dfs_romfs_close(struct dfs_fd *file)

 {

 	file->data = RT_NULL;

 	return DFS_STATUS_OK;

 }

 

-int dfs_romfs_open(struct dfs_fd* file)

+int dfs_romfs_open(struct dfs_fd *file)

 {

 	rt_size_t size;

-	struct romfs_dirent* dirent;

-	struct romfs_dirent* root_dirent;

+	struct romfs_dirent *dirent;

+	struct romfs_dirent *root_dirent;

 

-	root_dirent = (struct romfs_dirent*)file->fs->data;

+	root_dirent = (struct romfs_dirent *)file->fs->data;

 

 	if (file->flags & (DFS_O_CREAT | DFS_O_WRONLY | DFS_O_APPEND | DFS_O_TRUNC | DFS_O_RDWR))

 		return -DFS_STATUS_EINVAL;

 

 	dirent = dfs_romfs_lookup(root_dirent, file->path, &size);

-	if (dirent == RT_NULL) return -DFS_STATUS_ENOENT;

+	if (dirent == RT_NULL)

+		return -DFS_STATUS_ENOENT;

 

 	/* entry is a directory file type */

 	if (dirent->type == ROMFS_DIRENT_DIR)

 	{

-		if (!(file->flags & DFS_O_DIRECTORY) )

+		if (!(file->flags & DFS_O_DIRECTORY))

 			return -DFS_STATUS_ENOENT;

 	}

 	else

@@ -168,16 +189,17 @@ int dfs_romfs_open(struct dfs_fd* file)
 	return DFS_STATUS_OK;

 }

 

-int dfs_romfs_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)

+int dfs_romfs_stat(struct dfs_filesystem *fs, const char *path, struct stat *st)

 {

 	rt_size_t size;

-	struct romfs_dirent* dirent;

-	struct romfs_dirent* root_dirent;

+	struct romfs_dirent *dirent;

+	struct romfs_dirent *root_dirent;

 

-	root_dirent = (struct romfs_dirent*)fs->data;

+	root_dirent = (struct romfs_dirent *)fs->data;

 	dirent = dfs_romfs_lookup(root_dirent, path, &size);

 

-	if (dirent == RT_NULL) return -DFS_STATUS_ENOENT;

+	if (dirent == RT_NULL)

+		return -DFS_STATUS_ENOENT;

 

 	st->st_dev = 0;

 	st->st_mode = DFS_S_IFREG | DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |

@@ -196,22 +218,23 @@ int dfs_romfs_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)
 	return DFS_STATUS_OK;

 }

 

-int dfs_romfs_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count)

+int dfs_romfs_getdents(struct dfs_fd *file, struct dirent *dirp, rt_uint32_t count)

 {

 	rt_size_t index;

 	const char *name;

-	struct dirent* d;

+	struct dirent *d;

 	struct romfs_dirent *dirent, *sub_dirent;

 

-	dirent = (struct romfs_dirent*) file->data;

+	dirent = (struct romfs_dirent *)file->data;

 	RT_ASSERT(dirent->type == ROMFS_DIRENT_DIR);

 

 	/* enter directory */

-	dirent = (struct romfs_dirent*) dirent->data;

+	dirent = (struct romfs_dirent *)dirent->data;

 	

 	/* make integer count */

 	count = (count / sizeof(struct dirent));

-	if ( count == 0 ) return -DFS_STATUS_EINVAL;

+	if (count == 0)

+		return -DFS_STATUS_EINVAL;

 	

 	index = 0;

 	for (index = 0; index < count && file->pos < file->size; index ++)

diff --git a/components/dfs/filesystems/romfs/dfs_romfs.h b/components/dfs/filesystems/romfs/dfs_romfs.h
index 6a3f7ac1cc..3e0d7daf07 100644
--- a/components/dfs/filesystems/romfs/dfs_romfs.h
+++ b/components/dfs/filesystems/romfs/dfs_romfs.h
@@ -1,3 +1,16 @@
+/*

+ * File      : dfs_romfs.h

+ * This file is part of Device File System in RT-Thread RTOS

+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team

+ *

+ * The license and distribution terms for this file may be

+ * found in the file LICENSE in this distribution or at

+ * http://www.rt-thread.org/license/LICENSE.

+ *

+ * Change Logs:

+ * Date           Author       Notes

+ */

+

 #ifndef __DFS_ROMFS_H__

 #define __DFS_ROMFS_H__

 

diff --git a/components/dfs/include/dfs.h b/components/dfs/include/dfs.h
index 04fe678387..193c8b1678 100644
--- a/components/dfs/include/dfs.h
+++ b/components/dfs/include/dfs.h
@@ -1,7 +1,7 @@
 /*
  * File      : dfs.h
  * This file is part of Device File System in RT-Thread RTOS
- * COPYRIGHT (C) 2004-2010, RT-Thread Development Team
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
  *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
@@ -21,14 +21,14 @@
 extern "C" {
 #endif
 
-char* dfs_normalize_path(const char* directory, const char* filename);
-const char* dfs_subdir(const char* directory, const char* filename);
+char *dfs_normalize_path(const char *directory, const char *filename);
+const char *dfs_subdir(const char *directory, const char *filename);
 
 /* FD APIs */
 int fd_new(void);
-struct dfs_fd* fd_get(int fd);
-void fd_put(struct dfs_fd* fd);
-int fd_is_open(const char* pathname);
+struct dfs_fd *fd_get(int fd);
+void fd_put(struct dfs_fd *fd);
+int fd_is_open(const char *pathname);
 
 #ifdef __cplusplus
 }
diff --git a/components/dfs/include/dfs_def.h b/components/dfs/include/dfs_def.h
index 0651813c9e..8c40123b14 100644
--- a/components/dfs/include/dfs_def.h
+++ b/components/dfs/include/dfs_def.h
@@ -1,7 +1,7 @@
 /*
  * File      : dfs_def.h
  * This file is part of Device File System in RT-Thread RTOS
- * COPYRIGHT (C) 2004-2010, RT-Thread Development Team
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
  *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
@@ -13,6 +13,7 @@
  * 2004-10-14     Beranard     Clean up the code.
  * 2005-01-22     Beranard     Clean up the code, port to MinGW
  */
+ 
 #ifndef __DFS_DEF_H__
 #define __DFS_DEF_H__
 
@@ -277,11 +278,11 @@ struct dirent
 /* file descriptor */
 struct dfs_fd
 {
-    char* path;					/* Name (below mount point) */
+    char *path;					/* Name (below mount point) */
     int type;					/* Type (regular or socket) */
     int ref_count;				/* Descriptor reference count */
 
-    struct dfs_filesystem* fs;	/* Resident file system */
+    struct dfs_filesystem *fs;	/* Resident file system */
 
     rt_uint32_t flags;			/* Descriptor flags */
     rt_size_t 	size;			/* Size in bytes */
diff --git a/components/dfs/include/dfs_elm.h b/components/dfs/include/dfs_elm.h
index c54ee83c1d..656ba07711 100644
--- a/components/dfs/include/dfs_elm.h
+++ b/components/dfs/include/dfs_elm.h
@@ -1,17 +1,16 @@
 /*
-+------------------------------------------------------------------------------
-| Project   : Device Filesystem
-+------------------------------------------------------------------------------
-| Copyright 2004, 2005  www.fayfayspace.org.
-| All rights reserved.
-|------------------------------------------------------------------------------
-| File      : dfs_efs.h
-|------------------------------------------------------------------------------
-| Chang Logs:
-| Date           Author       Notes
-| 2010-02-06     Bernard      Add elm_init function declaration
-+------------------------------------------------------------------------------
-*/
+ * File      : dfs_elm.h
+ * This file is part of Device File System in RT-Thread RTOS
+ * COPYRIGHT (C) 2008-2011, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2010-02-06     Bernard      Add elm_init function declaration
+ */
 
 #ifndef __DFS_ELM_H__
 #define __DFS_ELM_H__
diff --git a/components/dfs/include/dfs_file.h b/components/dfs/include/dfs_file.h
index 3cf6681924..ba5f348605 100644
--- a/components/dfs/include/dfs_file.h
+++ b/components/dfs/include/dfs_file.h
@@ -1,17 +1,16 @@
 /*
-+------------------------------------------------------------------------------
-| Project   : Device Filesystem
-+------------------------------------------------------------------------------
-| Copyright 2004, 2005  www.fayfayspace.org.
-| All rights reserved.
-|------------------------------------------------------------------------------
-| File      : dfs_raw.h, the raw APIs of Device FileSystem
-|------------------------------------------------------------------------------
-| Chang Logs:
-| Date           Author       Notes
-| 2005-01-26     ffxz		  The first version
-+------------------------------------------------------------------------------
-*/
+ * File      : dfs_file.c
+ * This file is part of Device File System in RT-Thread RTOS
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2005-01-26     Bernard      The first version.
+ */
 
 #ifndef __DFS_RAW_H__
 #define __DFS_RAW_H__
@@ -20,16 +19,16 @@
 #include <dfs.h>
 #include <dfs_fs.h>
 
-int dfs_file_open(struct dfs_fd* fd, const char *path, int flags);
-int dfs_file_close(struct dfs_fd* fd);
-int dfs_file_ioctl(struct dfs_fd* fd, int cmd, void *args);
-int dfs_file_read(struct dfs_fd* fd, void *buf, rt_size_t len);
-int dfs_file_getdents(struct dfs_fd* fd, struct dirent* dirp, rt_size_t nbytes);
+int dfs_file_open(struct dfs_fd *fd, const char *path, int flags);
+int dfs_file_close(struct dfs_fd *fd);
+int dfs_file_ioctl(struct dfs_fd *fd, int cmd, void *args);
+int dfs_file_read(struct dfs_fd *fd, void *buf, rt_size_t len);
+int dfs_file_getdents(struct dfs_fd *fd, struct dirent *dirp, rt_size_t nbytes);
 int dfs_file_unlink(const char *path);
-int dfs_file_write(struct dfs_fd* fd, const void *buf, rt_size_t len);
-int dfs_file_lseek(struct dfs_fd* fd, rt_off_t offset);
+int dfs_file_write(struct dfs_fd *fd, const void *buf, rt_size_t len);
+int dfs_file_lseek(struct dfs_fd *fd, rt_off_t offset);
 int dfs_file_stat(const char *path, struct stat *buf);
-int dfs_file_rename(const char* oldpath, const char* newpath);
+int dfs_file_rename(const char *oldpath, const char *newpath);
 
 #endif
 
diff --git a/components/dfs/include/dfs_fs.h b/components/dfs/include/dfs_fs.h
index fafac355c1..2108d07c82 100644
--- a/components/dfs/include/dfs_fs.h
+++ b/components/dfs/include/dfs_fs.h
@@ -1,7 +1,7 @@
 /*
  * File      : dfs_fs.h
  * This file is part of Device File System in RT-Thread RTOS
- * COPYRIGHT (C) 2004-2010, RT-Thread Development Team
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
  *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
@@ -11,6 +11,7 @@
  * Date           Author       Notes
  * 2005-02-22     Bernard      The first version.
  */
+ 
 #ifndef __DFS_FS_H__
 #define __DFS_FS_H__
 
@@ -26,25 +27,25 @@ struct dfs_filesystem_operation
 	char *name;
 
 	/* mount and unmount file system */
-	int (*mount)	(struct dfs_filesystem* fs, unsigned long rwflag, const void* data);
-	int (*unmount)	(struct dfs_filesystem* fs);
+	int (*mount)	(struct dfs_filesystem *fs, unsigned long rwflag, const void *data);
+	int (*unmount)	(struct dfs_filesystem *fs);
 
 	/* make a file system */
-	int (*mkfs)     (const char* device_name);
-	int (*statfs)   (struct dfs_filesystem* fs, struct statfs *buf);
+	int (*mkfs)     (const char *device_name);
+	int (*statfs)   (struct dfs_filesystem *fs, struct statfs *buf);
 
-	int (*open)		(struct dfs_fd* fd);
-	int (*close)	(struct dfs_fd* fd);
-	int (*ioctl)	(struct dfs_fd* fd, int cmd, void *args);
-	int (*read)		(struct dfs_fd* fd, void* buf, rt_size_t count);
-	int (*write)	(struct dfs_fd* fd, const void* buf, rt_size_t count);
-	int (*flush)    (struct dfs_fd* fd);
-	int (*lseek)	(struct dfs_fd* fd, rt_off_t offset);
-	int (*getdents)	(struct dfs_fd* fd, struct dirent* dirp, rt_uint32_t count);
+	int (*open)		(struct dfs_fd *fd);
+	int (*close)	(struct dfs_fd *fd);
+	int (*ioctl)	(struct dfs_fd *fd, int cmd, void *args);
+	int (*read)		(struct dfs_fd *fd, void *buf, rt_size_t count);
+	int (*write)	(struct dfs_fd *fd, const void *buf, rt_size_t count);
+	int (*flush)    (struct dfs_fd *fd);
+	int (*lseek)	(struct dfs_fd *fd, rt_off_t offset);
+	int (*getdents)	(struct dfs_fd *fd, struct dirent *dirp, rt_uint32_t count);
 
-	int (*unlink)	(struct dfs_filesystem* fs, const char* pathname);
-	int (*stat)		(struct dfs_filesystem* fs, const char* filename, struct stat* buf);
-	int (*rename)	(struct dfs_filesystem* fs, const char* oldpath, const char* newpath);
+	int (*unlink)	(struct dfs_filesystem *fs, const char *pathname);
+	int (*stat)		(struct dfs_filesystem *fs, const char *filename, struct stat *buf);
+	int (*rename)	(struct dfs_filesystem *fs, const char *oldpath, const char *newpath);
 };
 
 /* Mounted file system */
@@ -52,8 +53,8 @@ struct dfs_filesystem
 {
 	rt_device_t dev_id;		/* Attached device */
 
-	char* path;				/* File system mount point */
-	const struct dfs_filesystem_operation* ops;	/* Operations for file system type */
+	char *path;				/* File system mount point */
+	const struct dfs_filesystem_operation *ops;	/* Operations for file system type */
 
 	void *data;				/* Specific file system data */
 };
@@ -67,23 +68,23 @@ struct dfs_partition
 	rt_sem_t lock;	
 };
 
-int dfs_register(const struct dfs_filesystem_operation* ops);
-struct dfs_filesystem* dfs_filesystem_lookup(const char *path);
-rt_err_t dfs_filesystem_get_partition(struct dfs_partition* part, rt_uint8_t* buf, rt_uint32_t pindex);
+int dfs_register(const struct dfs_filesystem_operation *ops);
+struct dfs_filesystem *dfs_filesystem_lookup(const char *path);
+rt_err_t dfs_filesystem_get_partition(struct dfs_partition *part, rt_uint8_t *buf, rt_uint32_t pindex);
 
-int dfs_mount(const char* device_name, const char* path,
-       const char* filesystemtype, rt_uint32_t rwflag, const
-       void* data);
+int dfs_mount(const char *device_name, const char *path,
+       const char *filesystemtype, rt_uint32_t rwflag, const
+       void *data);
 int dfs_unmount(const char *specialfile);
 
 /* extern variable */
-extern const struct dfs_filesystem_operation* filesystem_operation_table[];
+extern const struct dfs_filesystem_operation *filesystem_operation_table[];
 extern struct dfs_filesystem filesystem_table[];
 
 extern char working_directory[];
 
 void dfs_lock(void);
 void dfs_unlock(void);
-int dfs_statfs(const char* path, struct statfs* buffer);
+int dfs_statfs(const char *path, struct statfs *buffer);
 
 #endif
diff --git a/components/dfs/include/dfs_init.h b/components/dfs/include/dfs_init.h
index bc4e6faab5..061e0e23e8 100644
--- a/components/dfs/include/dfs_init.h
+++ b/components/dfs/include/dfs_init.h
@@ -1,26 +1,16 @@
 /*
-
-+------------------------------------------------------------------------------
-
-| Project   : Device Filesystem
-
-+------------------------------------------------------------------------------
-
-| Copyright 2004, 2005  www.fayfayspace.org.
-
-| All rights reserved.
-
-|------------------------------------------------------------------------------
-
-| File      : dfs_init.h, the initilization definitions of Device FileSystem
-|------------------------------------------------------------------------------
-| Chang Logs:
-
-| Date           Author       Notes
-
-| 2005-02-21     ffxz         The first version.
-+------------------------------------------------------------------------------
-*/
+ * File      : dfs_init.h
+ * This file is part of Device File System in RT-Thread RTOS
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2005-02-21     Bernard      The first version.
+ */
 
 #ifndef __DFS_INIT_H__
 #define __DFS_INIT_H__
diff --git a/components/dfs/include/dfs_posix.h b/components/dfs/include/dfs_posix.h
index 2eee57a1a8..93cd9747a4 100644
--- a/components/dfs/include/dfs_posix.h
+++ b/components/dfs/include/dfs_posix.h
@@ -1,7 +1,7 @@
 /*
  * File      : dfs_def.h
  * This file is part of Device File System in RT-Thread RTOS
- * COPYRIGHT (C) 2004-2010, RT-Thread Development Team
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
  *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
@@ -13,6 +13,7 @@
  * 2010-07-18     Bernard      add stat and statfs structure definitions. 
  * 2011-05-16     Yi.qiu       Change parameter name of rename, "new" is C++ key word.
  */
+ 
 #ifndef __DFS_POSIX_H__
 #define __DFS_POSIX_H__
 
@@ -82,9 +83,9 @@ typedef struct
 } DIR;
 
 /* directory api*/
-int mkdir (const char *path, mode_t mode);
-DIR* opendir(const char* name);
-struct dirent* readdir(DIR *d);
+int mkdir(const char *path, mode_t mode);
+DIR *opendir(const char *name);
+struct dirent *readdir(DIR *d);
 long telldir(DIR *d);
 void seekdir(DIR *d, off_t offset);
 void rewinddir(DIR *d);
diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index bf042a1b58..33b8f497a9 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -1,7 +1,7 @@
 /*
  * File      : dfs.c
  * This file is part of Device File System in RT-Thread RTOS
- * COPYRIGHT (C) 2004-2010, RT-Thread Development Team
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
  *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
@@ -10,7 +10,6 @@
  * Change Logs:
  * Date           Author       Notes
  * 2005-02-22     Bernard      The first version.
- * 2010-07-16
  */
 
 #include <dfs.h>
@@ -20,7 +19,7 @@
 #define NO_WORKING_DIR	"system does not support working dir\n"
 
 /* Global variables */
-const struct dfs_filesystem_operation* filesystem_operation_table[DFS_FILESYSTEM_TYPES_MAX];
+const struct dfs_filesystem_operation *filesystem_operation_table[DFS_FILESYSTEM_TYPES_MAX];
 struct dfs_filesystem filesystem_table[DFS_FILESYSTEMS_MAX];
 
 /* device filesystem lock */
@@ -44,7 +43,7 @@ struct dfs_fd fd_table[DFS_FD_MAX];
 /**
  * this function will initialize device file system.
  */
-void dfs_init()
+void dfs_init(void)
 {
 	/* clear filesystem operations table */
 	rt_memset(filesystem_operation_table, 0, sizeof(filesystem_operation_table));
@@ -68,7 +67,7 @@ void dfs_init()
  *
  * @note please don't invoke it on ISR.
  */
-void dfs_lock()
+void dfs_lock(void)
 {
 	rt_err_t result;
 
@@ -84,7 +83,7 @@ void dfs_lock()
  *
  * @note please don't invoke it on ISR.
  */
-void dfs_unlock()
+void dfs_unlock(void)
 {
 	rt_mutex_release(&fslock);
 }
@@ -97,7 +96,7 @@ void dfs_unlock()
  */
 int fd_new(void)
 {
-	struct dfs_fd* d;
+	struct dfs_fd *d;
 	int idx;
 
 	/* lock filesystem */
@@ -138,14 +137,16 @@ __result:
  * @return NULL on on this file descriptor or the file descriptor structure
  * pointer.
  */
-struct dfs_fd* fd_get(int fd)
+struct dfs_fd *fd_get(int fd)
 {
-	struct dfs_fd* d;
+	struct dfs_fd *d;
 
 #ifdef DFS_USING_STDIO
-	if ( fd < 3 || fd > DFS_FD_MAX + 3) return RT_NULL;
+	if (fd < 3 || fd > DFS_FD_MAX + 3) 
+		return RT_NULL;
 #else
-	if ( fd < 0 || fd > DFS_FD_MAX ) return RT_NULL;
+	if (fd < 0 || fd > DFS_FD_MAX) 
+		return RT_NULL;
 #endif
 
 	dfs_lock();
@@ -163,13 +164,13 @@ struct dfs_fd* fd_get(int fd)
  *
  * This function will put the file descriptor.
  */
-void fd_put(struct dfs_fd* fd)
+void fd_put(struct dfs_fd *fd)
 {
 	dfs_lock();
 	fd->ref_count --;
 
 	/* clear this fd entry */
-	if ( fd->ref_count == 0 )
+	if (fd->ref_count == 0)
 	{
 		rt_memset(fd, 0, sizeof(struct dfs_fd));
 	}
@@ -185,12 +186,12 @@ void fd_put(struct dfs_fd* fd)
  *
  * @return 0 on file has been open successfully, -1 on open failed.
  */
-int fd_is_open(const char* pathname)
+int fd_is_open(const char *pathname)
 {
 	char *fullpath;
 	unsigned int index;
-	struct dfs_filesystem* fs;
-	struct dfs_fd* fd;
+	struct dfs_filesystem *fs;
+	struct dfs_fd *fd;
 
 	fullpath = dfs_normalize_path(RT_NULL, pathname);
 	if (fullpath != RT_NULL)
@@ -207,16 +208,17 @@ int fd_is_open(const char* pathname)
 		/* get file path name under mounted file system */
 		if (fs->path[0] == '/' && fs->path[1] == '\0')
 			mountpath = fullpath;
-		else mountpath = fullpath + strlen(fs->path);
+		else 
+			mountpath = fullpath + strlen(fs->path);
 
 		dfs_lock();
 		for (index = 0; index < DFS_FD_MAX; index++)
 		{
 			fd = &(fd_table[index]);
-			if (fd->fs == RT_NULL) continue;
+			if (fd->fs == RT_NULL) 
+				continue;
 
-			if (fd->fs == fs &&
-				strcmp(fd->path, mountpath) == 0)
+			if (fd->fs == fs && strcmp(fd->path, mountpath) == 0)
 			{
 				/* found file in file descriptor table */
 				rt_free(fullpath);
@@ -240,9 +242,9 @@ int fd_is_open(const char* pathname)
  *
  * @return the subdir pointer in filename
  */
-const char* dfs_subdir(const char* directory, const char* filename)
+const char *dfs_subdir(const char *directory, const char *filename)
 {
-	const char* dir;
+	const char *dir;
 
 	if (strlen(directory) == strlen(filename)) /* it's a same path */
 		return RT_NULL;
@@ -263,7 +265,7 @@ const char* dfs_subdir(const char* directory, const char* filename)
  *
  * @return the built full file path (absoluted path)
  */
-char* dfs_normalize_path(const char* directory, const char* filename)
+char *dfs_normalize_path(const char *directory, const char *filename)
 {
 	char *fullpath;
 	char *dst0, *dst, *src;
@@ -311,7 +313,8 @@ char* dfs_normalize_path(const char* directory, const char* filename)
 				 /* './' case */
 				 src += 2;
 
-				 while ((*src == '/') && (*src != '\0')) src ++;
+				 while ((*src == '/') && (*src != '\0')) 
+				 	src ++;
 				 continue;
 			 }
 			 else if (src[1] == '.')
@@ -327,37 +330,47 @@ char* dfs_normalize_path(const char* directory, const char* filename)
 					/* '../' case */
 					 src += 3;
 
-					 while ((*src == '/') && (*src != '\0')) src ++;
+					 while ((*src == '/') && (*src != '\0')) 
+					 	src ++;
 					 goto up_one;
 				 }
 			 }
 		 }
 
 		 /* copy up the next '/' and erase all '/' */
-		 while ((c = *src++) != '\0' && c != '/') *dst ++ = c;
+		 while ((c = *src++) != '\0' && c != '/') 
+		 	*dst ++ = c;
 
 		 if (c == '/')
 		 {
 			 *dst ++ = '/';
-			 while (c == '/') c = *src++;
+			 while (c == '/') 
+			 	c = *src++;
 
 			 src --;
 		 }
-		 else if (!c) break;
+		 else if (!c) 
+		 	break;
 
 		 continue;
 
 up_one:
 		dst --;
-		if (dst < dst0) { rt_free(fullpath); return NULL;}
-		while (dst0 < dst && dst[-1] != '/') dst --;
+		if (dst < dst0)
+		{
+			rt_free(fullpath); 
+			return NULL;
+		}
+		while (dst0 < dst && dst[-1] != '/')
+			dst --;
 	}
 
 	*dst = '\0';
 
 	/* remove '/' in the end of path if exist */
 	dst --;
-	if ((dst != fullpath) && (*dst == '/')) *dst = '\0';
+	if ((dst != fullpath) && (*dst == '/'))
+		*dst = '\0';
 
 	return fullpath;
 }
diff --git a/components/dfs/src/dfs_file.c b/components/dfs/src/dfs_file.c
index f102c15d32..2746a11b66 100644
--- a/components/dfs/src/dfs_file.c
+++ b/components/dfs/src/dfs_file.c
@@ -1,7 +1,7 @@
 /*
  * File      : dfs_file.c
  * This file is part of Device File System in RT-Thread RTOS
- * COPYRIGHT (C) 2004-2010, RT-Thread Development Team
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
  *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
@@ -11,6 +11,7 @@
  * Date           Author       Notes
  * 2005-02-22     Bernard      The first version.
  */
+
 #include <dfs.h>
 #include <dfs_file.h>
 
@@ -28,14 +29,15 @@
  *
  * @return 0 on successful, -1 on failed.
  */
-int dfs_file_open(struct dfs_fd* fd, const char *path, int flags)
+int dfs_file_open(struct dfs_fd *fd, const char *path, int flags)
 {
-	struct dfs_filesystem* fs;
+	struct dfs_filesystem *fs;
 	char *fullpath;
 	int result;
 
 	/* parameter check */
-	if ( fd == RT_NULL ) return -DFS_STATUS_EINVAL;
+	if (fd == RT_NULL)
+		return -DFS_STATUS_EINVAL;
 
 	/* make sure we have an absolute path */
 	fullpath = dfs_normalize_path(RT_NULL, path);
@@ -48,7 +50,7 @@ int dfs_file_open(struct dfs_fd* fd, const char *path, int flags)
 
 	/* find filesystem */
 	fs = dfs_filesystem_lookup(fullpath);
-	if ( fs == RT_NULL )
+	if (fs == RT_NULL)
 	{
 		rt_free(fullpath); /* release path */
 		return -DFS_STATUS_ENOENT;
@@ -92,7 +94,7 @@ int dfs_file_open(struct dfs_fd* fd, const char *path, int flags)
 	}
 
 	fd->flags |= DFS_F_OPEN;
-	if ( flags & DFS_O_DIRECTORY )
+	if (flags & DFS_O_DIRECTORY)
 	{
 		fd->type = FT_DIRECTORY;
 		fd->flags |= DFS_F_DIRECTORY;
@@ -109,14 +111,16 @@ int dfs_file_open(struct dfs_fd* fd, const char *path, int flags)
  *
  * @return 0 on successful, -1 on failed.
  */
-int dfs_file_close(struct dfs_fd* fd)
+int dfs_file_close(struct dfs_fd *fd)
 {
 	int result = 0;
 
-	if (fd != RT_NULL && fd->fs->ops->close != RT_NULL) result = fd->fs->ops->close(fd);
+	if (fd != RT_NULL && fd->fs->ops->close != RT_NULL) 
+		result = fd->fs->ops->close(fd);
 
 	/* close fd error, return */
-	if ( result < 0 ) return result;
+	if (result < 0) 
+		return result;
 
 	rt_free(fd->path);
 	rt_memset(fd, 0, sizeof(struct dfs_fd));
@@ -133,14 +137,16 @@ int dfs_file_close(struct dfs_fd* fd)
  *
  * @return 0 on successful, -1 on failed.
  */
-int dfs_file_ioctl(struct dfs_fd* fd, int cmd, void *args)
+int dfs_file_ioctl(struct dfs_fd *fd, int cmd, void *args)
 {
-	struct dfs_filesystem* fs;
+	struct dfs_filesystem *fs;
 
-	if (fd == RT_NULL || fd->type != FT_REGULAR) return -DFS_STATUS_EINVAL;
+	if (fd == RT_NULL || fd->type != FT_REGULAR)
+		return -DFS_STATUS_EINVAL;
 
 	fs = fd->fs;
-	if (fs->ops->ioctl != RT_NULL) return fs->ops->ioctl(fd, cmd, args);
+	if (fs->ops->ioctl != RT_NULL) 
+		return fs->ops->ioctl(fd, cmd, args);
 
 	return -DFS_STATUS_ENOSYS;
 }
@@ -154,17 +160,20 @@ int dfs_file_ioctl(struct dfs_fd* fd, int cmd, void *args)
  *
  * @return the actual read data bytes or 0 on end of file or failed.
  */
-int dfs_file_read(struct dfs_fd* fd, void *buf, rt_size_t len)
+int dfs_file_read(struct dfs_fd *fd, void *buf, rt_size_t len)
 {
-	struct dfs_filesystem* fs;
+	struct dfs_filesystem *fs;
 	int result = 0;
 
-	if (fd == RT_NULL) return -DFS_STATUS_EINVAL;
+	if (fd == RT_NULL) 
+		return -DFS_STATUS_EINVAL;
 
-	fs = (struct dfs_filesystem*) fd->fs;
-	if (fs->ops->read == RT_NULL) return -DFS_STATUS_ENOSYS;
+	fs = (struct dfs_filesystem *)fd->fs;
+	if (fs->ops->read == RT_NULL) 
+		return -DFS_STATUS_ENOSYS;
 
-	if ( (result = fs->ops->read(fd, buf, len)) < 0 ) fd->flags |= DFS_F_EOF;
+	if ((result = fs->ops->read(fd, buf, len)) < 0)
+		fd->flags |= DFS_F_EOF;
 
 	return result;
 }
@@ -178,15 +187,17 @@ int dfs_file_read(struct dfs_fd* fd, void *buf, rt_size_t len)
  *
  * @return the read dirent, others on failed.
  */
-int dfs_file_getdents(struct dfs_fd* fd, struct dirent* dirp, rt_size_t nbytes)
+int dfs_file_getdents(struct dfs_fd *fd, struct dirent *dirp, rt_size_t nbytes)
 {
-	struct dfs_filesystem* fs;
+	struct dfs_filesystem *fs;
 
 	/* parameter check */
-	if (fd == RT_NULL || fd->type != FT_DIRECTORY) return -DFS_STATUS_EINVAL;
+	if (fd == RT_NULL || fd->type != FT_DIRECTORY) 
+		return -DFS_STATUS_EINVAL;
 
-	fs = (struct dfs_filesystem*) fd->fs;
-	if (fs->ops->getdents != RT_NULL) return fs->ops->getdents(fd, dirp, nbytes);
+	fs = (struct dfs_filesystem *)fd->fs;
+	if (fs->ops->getdents != RT_NULL)
+		return fs->ops->getdents(fd, dirp, nbytes);
 
 	return -DFS_STATUS_ENOSYS;
 }
@@ -202,19 +213,19 @@ int dfs_file_unlink(const char *path)
 {
 	int result;
 	char *fullpath;
-	struct dfs_filesystem* fs;
+	struct dfs_filesystem *fs;
 
 	result = DFS_STATUS_OK;
 
 	/* Make sure we have an absolute path */
 	fullpath = dfs_normalize_path(RT_NULL, path);
-	if ( fullpath == RT_NULL)
+	if (fullpath == RT_NULL)
 	{
 		return -DFS_STATUS_EINVAL;
 	}
 
 	/* get filesystem */
-	if ( (fs = dfs_filesystem_lookup(fullpath)) == RT_NULL)
+	if ((fs = dfs_filesystem_lookup(fullpath)) == RT_NULL)
 	{
 		result = -DFS_STATUS_ENOENT;
 		goto __exit;
@@ -250,14 +261,16 @@ __exit:
  *
  * @return the actual written data length.
  */
-int dfs_file_write(struct dfs_fd* fd, const void *buf, rt_size_t len)
+int dfs_file_write(struct dfs_fd *fd, const void *buf, rt_size_t len)
 {
-	struct dfs_filesystem* fs;
+	struct dfs_filesystem *fs;
 
-	if (fd == RT_NULL) return -DFS_STATUS_EINVAL;
+	if (fd == RT_NULL)
+		return -DFS_STATUS_EINVAL;
 
 	fs = fd->fs;
-	if (fs->ops->write == RT_NULL) return -DFS_STATUS_ENOSYS;
+	if (fs->ops->write == RT_NULL)
+		return -DFS_STATUS_ENOSYS;
 
 	return fs->ops->write(fd, buf, len);
 }
@@ -269,14 +282,16 @@ int dfs_file_write(struct dfs_fd* fd, const void *buf, rt_size_t len)
  *
  * @return 0 on successful, -1 on failed.
  */
-int dfs_file_flush(struct dfs_fd* fd)
+int dfs_file_flush(struct dfs_fd *fd)
 {
-	struct dfs_filesystem* fs;
+	struct dfs_filesystem *fs;
 
-	if (fd == RT_NULL) return -DFS_STATUS_EINVAL;
+	if (fd == RT_NULL)
+		return -DFS_STATUS_EINVAL;
 
 	fs = fd->fs;
-	if (fs->ops->flush == RT_NULL) return -DFS_STATUS_ENOSYS;
+	if (fs->ops->flush == RT_NULL)
+		return -DFS_STATUS_ENOSYS;
 
 	return fs->ops->flush(fd);
 }
@@ -289,13 +304,15 @@ int dfs_file_flush(struct dfs_fd* fd)
  *
  * @return the current position after seek.
  */
-int dfs_file_lseek(struct dfs_fd* fd, rt_off_t offset)
+int dfs_file_lseek(struct dfs_fd *fd, rt_off_t offset)
 {
 	int result;
-	struct dfs_filesystem* fs = fd->fs;
+	struct dfs_filesystem *fs = fd->fs;
 
-	if (fd == RT_NULL) return -DFS_STATUS_EINVAL;
-	if (fs->ops->lseek == RT_NULL) return -DFS_STATUS_ENOSYS;
+	if (fd == RT_NULL)
+		return -DFS_STATUS_EINVAL;
+	if (fs->ops->lseek == RT_NULL)
+		return -DFS_STATUS_ENOSYS;
 
 	result = fs->ops->lseek(fd, offset);
 
@@ -317,11 +334,11 @@ int dfs_file_lseek(struct dfs_fd* fd, rt_off_t offset)
 int dfs_file_stat(const char *path, struct stat *buf)
 {
 	int result;
-	char* fullpath;
-	struct dfs_filesystem* fs;
+	char *fullpath;
+	struct dfs_filesystem *fs;
 
 	fullpath = dfs_normalize_path(RT_NULL, path);
-	if ( fullpath == RT_NULL )
+	if (fullpath == RT_NULL)
 	{
 		return -1;
 	}
@@ -339,7 +356,7 @@ int dfs_file_stat(const char *path, struct stat *buf)
 		/* it's the root directory */
 		buf->st_dev   = 0;
 
-		buf->st_mode = DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |
+		buf->st_mode  = DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |
 			DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH;
 		buf->st_mode |= DFS_S_IFDIR | DFS_S_IXUSR | DFS_S_IXGRP | DFS_S_IXOTH;
 
@@ -378,7 +395,7 @@ int dfs_file_stat(const char *path, struct stat *buf)
  *
  * @return 0 on successful, -1 on failed.
  */
-int dfs_file_rename(const char* oldpath, const char* newpath)
+int dfs_file_rename(const char *oldpath, const char *newpath)
 {
 	int result;
 	struct dfs_filesystem *oldfs, *newfs;
@@ -388,34 +405,34 @@ int dfs_file_rename(const char* oldpath, const char* newpath)
 	newfullpath = RT_NULL;
 
 	oldfullpath = dfs_normalize_path(RT_NULL, oldpath);
-	if ( oldfullpath == RT_NULL )
+	if (oldfullpath == RT_NULL)
 	{
 		result = -DFS_STATUS_ENOENT;
 		goto __exit;
 	}
 
 	newfullpath = dfs_normalize_path(RT_NULL, newpath);
-	if ( newfullpath == RT_NULL )
+	if (newfullpath == RT_NULL)
 	{
 		result = -DFS_STATUS_ENOENT;
 		goto __exit;
 	}
 
-	if ( (oldfs = dfs_filesystem_lookup(oldfullpath)) == RT_NULL )
+	if ((oldfs = dfs_filesystem_lookup(oldfullpath)) == RT_NULL)
 	{
 		result = -DFS_STATUS_ENOENT;
 		goto __exit;
 	}
 
-	if ( (newfs = dfs_filesystem_lookup(newfullpath)) == RT_NULL )
+	if ((newfs = dfs_filesystem_lookup(newfullpath)) == RT_NULL)
 	{
 		result = -DFS_STATUS_ENOENT;
 		goto __exit;
 	}
 
-	if ( oldfs == newfs )
+	if (oldfs == newfs)
 	{
-		if ( oldfs->ops->rename == RT_NULL )
+		if (oldfs->ops->rename == RT_NULL)
 		{
 			result = -DFS_STATUS_ENOSYS;
 			goto __exit;
@@ -440,7 +457,7 @@ __exit:
 
 static struct dfs_fd fd;
 static struct dirent dirent;
-void ls(const char* pathname)
+void ls(const char *pathname)
 {
 	struct stat stat;
 	int length;
@@ -459,24 +476,25 @@ void ls(const char* pathname)
 	}
 	else
 	{
-		path = (char*)pathname;
+		path = (char *)pathname;
 	}
 
 	/* list directory */
-	if ( dfs_file_open(&fd, path, DFS_O_DIRECTORY) == 0 )
+	if (dfs_file_open(&fd, path, DFS_O_DIRECTORY) == 0)
 	{
 		rt_kprintf("Directory %s:\n", path);
 		do
 		{
 			rt_memset(&dirent, 0, sizeof(struct dirent));
 			length = dfs_file_getdents(&fd, &dirent, sizeof(struct dirent));
-			if ( length > 0 )
+			if (length > 0)
 			{
 				rt_memset(&stat, 0, sizeof(struct stat));
 
 				/* build full path for each file */
 				fullpath = dfs_normalize_path(path, dirent.d_name);
-				if (fullpath == RT_NULL) break;
+				if (fullpath == RT_NULL) 
+					break;
 
 				if (dfs_file_stat(fullpath, &stat) == 0)
 				{
@@ -502,11 +520,12 @@ void ls(const char* pathname)
 	{
 		rt_kprintf("No such directory\n");
 	}
-	if (pathname == RT_NULL) rt_free(path);
+	if (pathname == RT_NULL) 
+		rt_free(path);
 }
 FINSH_FUNCTION_EXPORT(ls, list directory contents)
 
-void rm(const char* filename)
+void rm(const char *filename)
 {
 	if (dfs_file_unlink(filename) < 0)
 	{
@@ -541,7 +560,7 @@ void cat(const char* filename)
 FINSH_FUNCTION_EXPORT(cat, print file)
 
 #define BUF_SZ	4096
-void copy(const char* src, const char* dst)
+void copy(const char *src, const char *dst)
 {
 	struct dfs_fd src_fd;
 	rt_uint8_t *block_ptr;
diff --git a/components/dfs/src/dfs_fs.c b/components/dfs/src/dfs_fs.c
index da1e456c7b..fc27fe354a 100644
--- a/components/dfs/src/dfs_fs.c
+++ b/components/dfs/src/dfs_fs.c
@@ -1,7 +1,7 @@
 /*
  * File      : dfs_fs.c
  * This file is part of Device File System in RT-Thread RTOS
- * COPYRIGHT (C) 2004-2010, RT-Thread Development Team
+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team
  *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
@@ -13,6 +13,7 @@
  * 2010-06-30     Bernard      Optimize for RT-Thread RTOS
  * 2011-03-12     Bernard      fix the filesystem lookup issue.
  */
+
 #include <dfs_fs.h>
 #include <dfs_file.h>
 
@@ -28,43 +29,43 @@
  *
  * @return 0 on sucessful, -1 on failed.
  */
-int dfs_register(const struct dfs_filesystem_operation* ops)
+int dfs_register(const struct dfs_filesystem_operation *ops)
 {
-    int index, result;
+	int index, result;
 
 	result = 0;
 
 	/* lock filesystem */
 	dfs_lock();
 
-    /* check if this filesystem was already registered */
-    for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index++)
-    {
-        if (filesystem_operation_table[index] != RT_NULL &&
-                strcmp(filesystem_operation_table[index]->name, ops->name) == 0)
-        {
-        	result = -1;
-            goto err;
-        }
-    }
+	/* check if this filesystem was already registered */
+	for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index++)
+	{
+		if (filesystem_operation_table[index] != RT_NULL &&
+			strcmp(filesystem_operation_table[index]->name, ops->name) == 0)
+		{
+			result = -1;
+			goto err;
+		}
+	}
 
-    /* find out an empty filesystem type entry */
-    for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX && filesystem_operation_table[index] != RT_NULL;
-            index++) ;
+	/* find out an empty filesystem type entry */
+	for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX && filesystem_operation_table[index] != RT_NULL;
+		index++) ;
 
-    /* filesystem type table full */
-    if (index == DFS_FILESYSTEM_TYPES_MAX)
+	/* filesystem type table full */
+	if (index == DFS_FILESYSTEM_TYPES_MAX)
 	{
 		result = -1;
 		goto err;
-    }
+	}
 
-    /* save the filesystem's operations */
-    filesystem_operation_table[index] = ops;
+	/* save the filesystem's operations */
+	filesystem_operation_table[index] = ops;
 
 err:
 	dfs_unlock();
-    return result;
+	return result;
 }
 
 /**
@@ -75,42 +76,44 @@ err:
  * @return the found file system or NULL if no file system mounted on
  * specified path
  */
-struct dfs_filesystem* dfs_filesystem_lookup(const char *path)
+struct dfs_filesystem *dfs_filesystem_lookup(const char *path)
 {
-    struct dfs_filesystem* fs;
-    rt_uint32_t index, fspath, prefixlen;
+	struct dfs_filesystem *fs;
+	rt_uint32_t index, fspath, prefixlen;
 
-    fs = RT_NULL;
-    prefixlen = 0;
+	fs = RT_NULL;
+	prefixlen = 0;
 
-    /* lock filesystem */
+	/* lock filesystem */
 	dfs_lock();
 
-    /* lookup it in the filesystem table */
-    for (index = 0; index < DFS_FILESYSTEMS_MAX; index++)
-    {
-		if (filesystem_table[index].path == RT_NULL) continue;
+	/* lookup it in the filesystem table */
+	for (index = 0; index < DFS_FILESYSTEMS_MAX; index++)
+	{
+		if (filesystem_table[index].path == RT_NULL)
+			continue;
 		else
 		{
 			fspath = strlen(filesystem_table[index].path);
-			if (fspath < prefixlen) continue;
+			if (fspath < prefixlen)
+				continue;
 		}
 
-        if ((filesystem_table[index].ops != RT_NULL) &&
-            (strncmp(filesystem_table[index].path, path, fspath) == 0))
-        {
-        	/* check next path separator */
-        	if ( fspath > 1 && (strlen(path) > fspath) &&
-        		(path[fspath] != '/')) continue;
+		if ((filesystem_table[index].ops != RT_NULL) &&
+			(strncmp(filesystem_table[index].path, path, fspath) == 0))
+		{
+			/* check next path separator */
+			if (fspath > 1 && (strlen(path) > fspath) && (path[fspath] != '/'))
+				continue;
 
-            fs = &filesystem_table[index];
-            prefixlen = fspath;
-        }
-    }
+			fs = &filesystem_table[index];
+			prefixlen = fspath;
+		}
+	}
 
 	dfs_unlock();
 
-    return fs;
+	return fs;
 }
 
 /**
@@ -122,69 +125,66 @@ struct dfs_filesystem* dfs_filesystem_lookup(const char *path)
  *
  * @return RT_EOK on successful or -RT_ERROR on failed.
  */
-rt_err_t dfs_filesystem_get_partition(struct dfs_partition* part, rt_uint8_t* buf, rt_uint32_t pindex)
+rt_err_t dfs_filesystem_get_partition(struct dfs_partition *part, rt_uint8_t *buf, rt_uint32_t pindex)
 {
 #define DPT_ADDRESS		0x1be		/* device partition offset in Boot Sector */
 #define DPT_ITEM_SIZE	16			/* partition item size */
 
-    rt_uint8_t* dpt;
-    rt_uint8_t type;
-    rt_err_t result;
+	rt_uint8_t *dpt;
+	rt_uint8_t type;
+	rt_err_t result;
 
-    RT_ASSERT(part != RT_NULL);
-    RT_ASSERT(buf != RT_NULL);
+	RT_ASSERT(part != RT_NULL);
+	RT_ASSERT(buf != RT_NULL);
 
-    result = RT_EOK;
+	result = RT_EOK;
 
-    dpt = buf + DPT_ADDRESS + pindex * DPT_ITEM_SIZE;
+	dpt = buf + DPT_ADDRESS + pindex * DPT_ITEM_SIZE;
 
-    if ((*dpt != 0x80) && (*dpt != 0x00))
-    {
-        /* which is not a partition table */
-        result = -RT_ERROR;
-        return result;
-    }
+	if ((*dpt != 0x80) && (*dpt != 0x00))
+	{
+		/* which is not a partition table */
+		result = -RT_ERROR;
+		return result;
+	}
 
-    /* get partition type */
-    type = *(dpt+4);
+	/* get partition type */
+	type = *(dpt+4);
 
-    if (type != 0)
-    {
-        /* set partition type */
-        part->type = type;
+	if (type != 0)
+	{
+		/* set partition type */
+		part->type = type;
 
-        /* get partition offset and size */
-        part->offset = *(dpt+ 8) | *(dpt+ 9) << 8 |
-                       *(dpt+10) << 16 | *(dpt+11) << 24;
-        part->size = *(dpt+12) | *(dpt+13) << 8 |
-                     *(dpt+14) << 16 | *(dpt+15) << 24;
+		/* get partition offset and size */
+		part->offset = *(dpt+8) | *(dpt+9)<<8 | *(dpt+10)<<16 | *(dpt+11)<<24;
+		part->size = *(dpt+12) | *(dpt+13)<<8 | *(dpt+14)<<16 | *(dpt+15)<<24;
 
-        rt_kprintf("found part[%d], begin: %d, size: ",
-                   pindex, part->offset * 512);
-        if ( (part->size>>11) > 0 ) /* MB */
-        {
-            unsigned int part_size;
-            part_size = part->size>>11;/* MB */
-            if ( (part_size>>10) > 0) /* GB */
-            {
-                rt_kprintf("%d.%d%s",part_size>>10,part_size&0x3FF,"GB\r\n");/* GB */
-            }
-            else
-            {
-                rt_kprintf("%d.%d%s",part_size,(part->size>>1)&0x3FF,"MB\r\n");/* MB */
-            }
-        }
-        else
-        {
-            rt_kprintf("%d%s",part->size>>1,"KB\r\n");/* KB */
-        }
-    }
-    else
-    {
-        result = -RT_ERROR;
-    }
+		rt_kprintf("found part[%d], begin: %d, size: ", pindex, part->offset*512);
+		if ((part->size>>11) > 0) /* MB */
+		{
+			unsigned int part_size;
+			part_size = part->size >> 11;/* MB */
+			if ((part_size>>10) > 0) /* GB */
+			{
+				rt_kprintf("%d.%d%s",part_size>>10,part_size&0x3FF,"GB\r\n");/* GB */
+			}
+			else
+			{
+				rt_kprintf("%d.%d%s",part_size,(part->size>>1)&0x3FF,"MB\r\n");/* MB */
+			}
+		}
+		else
+		{
+			rt_kprintf("%d%s",part->size>>1,"KB\r\n");/* KB */
+		}
+	}
+	else
+	{
+		result = -RT_ERROR;
+	}
 
-    return result;
+	return result;
 }
 
 /**
@@ -198,17 +198,17 @@ rt_err_t dfs_filesystem_get_partition(struct dfs_partition* part, rt_uint8_t* bu
  *
  * @return 0 on successful or -1 on failed.
  */
-int dfs_mount(const char* device_name, const char* path,
-              const char* filesystemtype, unsigned long rwflag, const
-              void* data)
+int dfs_mount(const char *device_name, const char *path,
+			const char *filesystemtype, unsigned long rwflag, const
+			void *data)
 {
-    const struct dfs_filesystem_operation* ops;
-    struct dfs_filesystem* fs;
-    char *fullpath=RT_NULL;
-    rt_device_t dev_id;
-    int index;
+	const struct dfs_filesystem_operation *ops;
+	struct dfs_filesystem *fs;
+	char *fullpath=RT_NULL;
+	rt_device_t dev_id;
+	int index;
 
-    /* open specific device */
+	/* open specific device */
 	if (device_name != RT_NULL)
 	{
 		dev_id = rt_device_find(device_name);
@@ -225,112 +225,117 @@ int dfs_mount(const char* device_name, const char* path,
 		dev_id = RT_NULL;
 	}
 
-    /* find out specific filesystem */
+	/* find out specific filesystem */
 	dfs_lock();
-    for ( index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index++ )
-    {
-        if (strcmp(filesystem_operation_table[index]->name, filesystemtype) == 0)break;
-    }
+	for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index++)
+	{
+		if (strcmp(filesystem_operation_table[index]->name, filesystemtype) == 0)
+			break;
+	}
 
-    /* can't find filesystem */
-    if ( index == DFS_FILESYSTEM_TYPES_MAX )
-    {
-        rt_set_errno(-DFS_STATUS_ENODEV);
-        dfs_unlock();
-        return -1;
-    }
-    ops = filesystem_operation_table[index];
-    dfs_unlock();
+	/* can't find filesystem */
+	if (index == DFS_FILESYSTEM_TYPES_MAX)
+	{
+		rt_set_errno(-DFS_STATUS_ENODEV);
+		dfs_unlock();
+		return -1;
+	}
+	ops = filesystem_operation_table[index];
+	dfs_unlock();
 
-    /* make full path for special file */
+	/* make full path for special file */
 	fullpath = dfs_normalize_path(RT_NULL, path);
-    if ( fullpath == RT_NULL) /* not an abstract path */
-    {
-        rt_set_errno(-DFS_STATUS_ENOTDIR);
-        return -1;
-    }
+	if (fullpath == RT_NULL) /* not an abstract path */
+	{
+		rt_set_errno(-DFS_STATUS_ENOTDIR);
+		return -1;
+	}
 
-    /* Check if the path exists or not, raw APIs call, fixme */
-    if ( (strcmp(fullpath, "/") != 0) && (strcmp(fullpath, "/dev") != 0) )
-    {
-        struct dfs_fd fd;
+	/* Check if the path exists or not, raw APIs call, fixme */
+	if ((strcmp(fullpath, "/") != 0) && (strcmp(fullpath, "/dev") != 0))
+	{
+		struct dfs_fd fd;
 
-        if ( dfs_file_open(&fd, fullpath, DFS_O_RDONLY | DFS_O_DIRECTORY) < 0 )
-        {
-        	rt_free(fullpath);
-            rt_set_errno(-DFS_STATUS_ENOTDIR);
-            return -1;
-        }
-        dfs_file_close(&fd);
-    }
+		if (dfs_file_open(&fd, fullpath, DFS_O_RDONLY | DFS_O_DIRECTORY) < 0)
+		{
+			rt_free(fullpath);
+			rt_set_errno(-DFS_STATUS_ENOTDIR);
+			return -1;
+		}
+		dfs_file_close(&fd);
+	}
 
-    /* check whether the file system mounted or not */
+	/* check whether the file system mounted or not */
 	dfs_lock();
-    for (index =0; index < DFS_FILESYSTEMS_MAX; index++)
-    {
-        if ( filesystem_table[index].ops != RT_NULL &&
-                strcmp(filesystem_table[index].path, path) == 0 )
-        {
-            rt_set_errno(-DFS_STATUS_EINVAL);
-            goto err1;
-        }
-    }
+	for (index =0; index < DFS_FILESYSTEMS_MAX; index++)
+	{
+		if (filesystem_table[index].ops != RT_NULL &&
+			strcmp(filesystem_table[index].path, path) == 0)
+		{
+			rt_set_errno(-DFS_STATUS_EINVAL);
+			goto err1;
+		}
+	}
 
-    /* find out en empty filesystem table entry */
-    for (index = 0; index < DFS_FILESYSTEMS_MAX && filesystem_table[index].ops != RT_NULL;
-            index++) ;
-    if ( index == DFS_FILESYSTEMS_MAX )	/* can't find en empty filesystem table entry */
-    {
-        rt_set_errno(-DFS_STATUS_ENOSPC);
-        goto err1;
-    }
+	/* find out en empty filesystem table entry */
+	for (index = 0; index < DFS_FILESYSTEMS_MAX && filesystem_table[index].ops != RT_NULL;
+		index++) ;
+	if (index == DFS_FILESYSTEMS_MAX)	/* can't find en empty filesystem table entry */
+	{
+		rt_set_errno(-DFS_STATUS_ENOSPC);
+		goto err1;
+	}
 
-    /* register file system */
-    fs = &(filesystem_table[index]);
+	/* register file system */
+	fs = &(filesystem_table[index]);
 	fs->path = fullpath;
-    fs->ops = ops;
-    fs->dev_id = dev_id;
-    /* release filesystem_table lock */
+	fs->ops = ops;
+	fs->dev_id = dev_id;
+	/* release filesystem_table lock */
 	dfs_unlock();
 
 	/* open device, but do not check the status of device */
-	if (dev_id != RT_NULL) rt_device_open(fs->dev_id, RT_DEVICE_OFLAG_RDWR);
+	if (dev_id != RT_NULL)
+		rt_device_open(fs->dev_id, RT_DEVICE_OFLAG_RDWR);
 
-    if (ops->mount == RT_NULL) /* there is no mount implementation */
-    {
-		if (dev_id != RT_NULL) rt_device_close(dev_id);
-    	dfs_lock();
-        /* clear filesystem table entry */
-        rt_memset(fs, 0, sizeof(struct dfs_filesystem));
+	if (ops->mount == RT_NULL) /* there is no mount implementation */
+	{
+		if (dev_id != RT_NULL)
+			rt_device_close(dev_id);
+		dfs_lock();
+		/* clear filesystem table entry */
+		rt_memset(fs, 0, sizeof(struct dfs_filesystem));
 		dfs_unlock();
 
 		rt_free(fullpath);
-        rt_set_errno(-DFS_STATUS_ENOSYS);
-        return -1;
-    }
-    /* call mount of this filesystem */
-    else if (ops->mount(fs, rwflag, data) < 0)
-    {
-        /* close device */
-        if (dev_id != RT_NULL) rt_device_close(fs->dev_id);
+		rt_set_errno(-DFS_STATUS_ENOSYS);
+		return -1;
+	}
+	/* call mount of this filesystem */
+	else if (ops->mount(fs, rwflag, data) < 0)
+	{
+		/* close device */
+		if (dev_id != RT_NULL)
+			rt_device_close(fs->dev_id);
 
-        /* mount failed */
+		/* mount failed */
 		dfs_lock();
-        /* clear filesystem table entry */
-        rt_memset(fs, 0, sizeof(struct dfs_filesystem));
+		/* clear filesystem table entry */
+		rt_memset(fs, 0, sizeof(struct dfs_filesystem));
 		dfs_unlock();
 
 		rt_free(fullpath);
 		return -1;
-    }
+	}
 
-    return 0;
+	return 0;
 
 err1:
-    dfs_unlock();
-	if (fullpath != RT_NULL) rt_free(fullpath);
+	dfs_unlock();
+	if (fullpath != RT_NULL)
+		rt_free(fullpath);
 
-    return -1;
+	return -1;
 }
 
 /**
@@ -342,42 +347,42 @@ err1:
  */
 int dfs_unmount(const char *specialfile)
 {
-    char *fullpath;
-    struct dfs_filesystem* fs = RT_NULL;
+	char *fullpath;
+	struct dfs_filesystem *fs = RT_NULL;
 
-    fullpath = dfs_normalize_path(RT_NULL, specialfile);
-    if (fullpath == RT_NULL)
-    {
-        rt_set_errno(-DFS_STATUS_ENOTDIR);
-        return -1;
-    }
+	fullpath = dfs_normalize_path(RT_NULL, specialfile);
+	if (fullpath == RT_NULL)
+	{
+		rt_set_errno(-DFS_STATUS_ENOTDIR);
+		return -1;
+	}
 
-    /* lock filesystem */
-    dfs_lock();
+	/* lock filesystem */
+	dfs_lock();
 
-    fs = dfs_filesystem_lookup(fullpath);
-    if (fs != RT_NULL && fs->ops->unmount != RT_NULL && fs->ops->unmount(fs) < 0)
-    {
-        goto err1;
-    }
+	fs = dfs_filesystem_lookup(fullpath);
+	if (fs != RT_NULL && fs->ops->unmount != RT_NULL && fs->ops->unmount(fs) < 0)
+	{
+		goto err1;
+	}
 
-    /* close device, but do not check the status of device */
+	/* close device, but do not check the status of device */
 	if (fs->dev_id != RT_NULL)
-	    rt_device_close(fs->dev_id);
+		rt_device_close(fs->dev_id);
 
-    /* clear this filesystem table entry */
-    rt_memset(fs, 0, sizeof(struct dfs_filesystem));
+	/* clear this filesystem table entry */
+	rt_memset(fs, 0, sizeof(struct dfs_filesystem));
 
 	dfs_unlock();
 	rt_free(fullpath);
 
-    return 0;
+	return 0;
 
 err1:
 	dfs_unlock();
 	rt_free(fullpath);
 
-    return -1;
+	return -1;
 }
 
 /**
@@ -388,18 +393,18 @@ err1:
  *
  * @return 0 on successful, otherwise failed.
  */
-int dfs_mkfs(const char* fs_name, const char* device_name)
+int dfs_mkfs(const char *fs_name, const char *device_name)
 {
-    int index;
+	int index;
 
 	/* lock filesystem */
 	dfs_lock();
-    /* find the file system operations */
-    for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index++)
-    {
-        if (filesystem_operation_table[index] != RT_NULL &&
-                strcmp(filesystem_operation_table[index]->name, fs_name) == 0)
-        {
+	/* find the file system operations */
+	for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index++)
+	{
+		if (filesystem_operation_table[index] != RT_NULL &&
+			strcmp(filesystem_operation_table[index]->name, fs_name) == 0)
+		{
 			/* find file system operation */
 			const struct dfs_filesystem_operation* ops = filesystem_operation_table[index];
 			dfs_unlock();
@@ -408,8 +413,8 @@ int dfs_mkfs(const char* fs_name, const char* device_name)
 				return ops->mkfs(device_name);
 
 			break;
-        }
-    }
+		}
+	}
 	dfs_unlock();
 
 	return -1;
@@ -423,9 +428,9 @@ int dfs_mkfs(const char* fs_name, const char* device_name)
  *
  * @return 0 on successful, others on failed.
  */
-int dfs_statfs(const char* path, struct statfs* buffer)
+int dfs_statfs(const char *path, struct statfs *buffer)
 {
-	struct dfs_filesystem* fs;
+	struct dfs_filesystem *fs;
 
 	fs = dfs_filesystem_lookup(path);
 	if (fs != NULL)
@@ -439,13 +444,13 @@ int dfs_statfs(const char* path, struct statfs* buffer)
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>
-void mkfs(const char* fs_name, const char* device_name)
+void mkfs(const char *fs_name, const char *device_name)
 {
 	dfs_mkfs(fs_name, device_name);
 }
 FINSH_FUNCTION_EXPORT(mkfs, make a file system);
 
-void df(const char* path)
+void df(const char *path)
 {
 	struct statfs buffer;
 
diff --git a/components/dfs/src/dfs_posix.c b/components/dfs/src/dfs_posix.c
index 1c81e6c1fc..c21917d29a 100644
--- a/components/dfs/src/dfs_posix.c
+++ b/components/dfs/src/dfs_posix.c
@@ -1,7 +1,7 @@
 /*

  * File      : dfs_posix.c

  * This file is part of Device File System in RT-Thread RTOS

- * COPYRIGHT (C) 2004-2010, RT-Thread Development Team

+ * COPYRIGHT (C) 2004-2011, RT-Thread Development Team

  *

  * The license and distribution terms for this file may be

  * found in the file LICENSE in this distribution or at

@@ -33,11 +33,12 @@
 int open(const char *file, int flags, int mode)

 {

 	int fd, result;

-	struct dfs_fd* d;

+	struct dfs_fd *d;

 

 	/* allocate a fd */

 	fd = fd_new();

-	if (fd < 0) return -1;

+	if (fd < 0)

+		return -1;

 	d  = fd_get(fd);

 

 	result = dfs_file_open(d, file, flags);

@@ -68,7 +69,7 @@ int open(const char *file, int flags, int mode)
 int close(int fd)

 {

 	int result;

-	struct dfs_fd* d;

+	struct dfs_fd *d;

 

 	d = fd_get(fd);

 	if (d == RT_NULL)

@@ -103,7 +104,7 @@ int close(int fd)
 int read(int fd, void *buf, size_t len)

 {

 	int result;

-	struct dfs_fd* d;

+	struct dfs_fd *d;

 

 	/* get the fd */

 	d  = fd_get(fd);

@@ -140,7 +141,7 @@ int read(int fd, void *buf, size_t len)
 int write(int fd, const void *buf, size_t len)

 {

 	int result;

-	struct dfs_fd* d;

+	struct dfs_fd *d;

 

 	/* get the fd */

 	d  = fd_get(fd);

@@ -177,7 +178,7 @@ int write(int fd, const void *buf, size_t len)
 off_t lseek(int fd, off_t offset, int whence)

 {

 	int result;

-	struct dfs_fd* d;

+	struct dfs_fd *d;

 

 	d  = fd_get(fd);

 	if (d == RT_NULL)

@@ -200,7 +201,7 @@ off_t lseek(int fd, off_t offset, int whence)
 		break;

 	}

 

-	if( offset < 0 )

+	if(offset < 0)

 	{

 		rt_set_errno(DFS_STATUS_EINVAL);

 		return -1;

@@ -229,7 +230,7 @@ off_t lseek(int fd, off_t offset, int whence)
  *

  * note: the old and new file name must be belong to a same file system.

  */

-int rename(const char* old, const char* new)

+int rename(const char *old, const char *new)

 {

 	int result;

 

@@ -292,7 +293,7 @@ int stat(const char *file, struct stat *buf)
  */

 int fstat(int fildes, struct stat *buf)

 {

-	struct dfs_fd* d;

+	struct dfs_fd *d;

 

 	/* get the fd */

 	d  = fd_get(fildes);

@@ -303,7 +304,7 @@ int fstat(int fildes, struct stat *buf)
 	}

 

 	/* it's the root directory */

-	buf->st_dev   = 0;

+	buf->st_dev = 0;

 

 	buf->st_mode = DFS_S_IFREG | DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |

 			DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH;

@@ -356,11 +357,15 @@ int statfs(const char *path, struct statfs *buf)
 int mkdir (const char *path, mode_t mode)

 {

 	int fd;

-	struct dfs_fd* d;

+	struct dfs_fd *d;

 	int result;

 

 	fd = fd_new();

-	if (fd == -1) { rt_kprintf("no fd\n"); return -1; }

+	if (fd == -1)

+	{

+		rt_kprintf("no fd\n");

+		return -1;

+	}

 

 	d = fd_get(fd);

 

@@ -410,17 +415,21 @@ int rmdir(const char *pathname)
  *

  * @return the DIR pointer of directory, NULL on open failed.

  */

-DIR* opendir(const char* name)

+DIR *opendir(const char *name)

 {

-	struct dfs_fd* d;

+	struct dfs_fd *d;

 	int fd, result;

-	DIR* t;

+	DIR *t;

 

 	t = RT_NULL;

 

 	/* allocate a fd */

 	fd = fd_new();

-	if (fd == -1) { rt_kprintf("no fd\n"); return RT_NULL; }

+	if (fd == -1)

+	{

+		rt_kprintf("no fd\n");

+		return RT_NULL;

+	}

 	d  = fd_get(fd);

 

 	result = dfs_file_open(d, name, DFS_O_RDONLY | DFS_O_DIRECTORY);

@@ -459,10 +468,10 @@ DIR* opendir(const char* name)
  *

  * @return the next directory entry, NULL on the end of directory or failed.

  */

-struct dirent* readdir(DIR *d)

+struct dirent *readdir(DIR *d)

 {

 	int result;

-	struct dfs_fd* fd;

+	struct dfs_fd *fd;

 

 	fd = fd_get(d->fd);

 	if (fd == RT_NULL)

@@ -488,7 +497,7 @@ struct dirent* readdir(DIR *d)
 	}

 

 	fd_put(fd);

-	return (struct dirent*)(d->buf+d->cur);

+	return (struct dirent *)(d->buf+d->cur);

 }

 

 /**

@@ -501,7 +510,7 @@ struct dirent* readdir(DIR *d)
  */

 long telldir(DIR *d)

 {

-	struct dfs_fd* fd;

+	struct dfs_fd *fd;

 	long result;

 

 	fd = fd_get(d->fd);

@@ -526,7 +535,7 @@ long telldir(DIR *d)
  */

 void seekdir(DIR *d, off_t offset)

 {

-	struct dfs_fd* fd;

+	struct dfs_fd *fd;

 

 	fd = fd_get(d->fd);

 	if (fd == RT_NULL)

@@ -536,7 +545,8 @@ void seekdir(DIR *d, off_t offset)
 	}

 

 	/* seek to the offset position of directory */

-	if (dfs_file_lseek(fd, offset) >= 0) d->num = d->cur = 0;

+	if (dfs_file_lseek(fd, offset) >= 0)

+		d->num = d->cur = 0;

 	fd_put(fd);

 }

 

@@ -547,7 +557,7 @@ void seekdir(DIR *d, off_t offset)
  */

 void rewinddir(DIR *d)

 {

-	struct dfs_fd* fd;

+	struct dfs_fd *fd;

 

 	fd = fd_get(d->fd);

 	if (fd == RT_NULL)

@@ -557,7 +567,8 @@ void rewinddir(DIR *d)
 	}

 

 	/* seek to the beginning of directory */

-	if (dfs_file_lseek(fd, 0) >= 0) d->num = d->cur = 0;

+	if (dfs_file_lseek(fd, 0) >= 0)

+		d->num = d->cur = 0;

 	fd_put(fd);

 }

 

@@ -569,10 +580,10 @@ void rewinddir(DIR *d)
  *

  * @return 0 on successful, -1 on failed.

  */

-int closedir(DIR* d)

+int closedir(DIR *d)

 {

 	int result;

-	struct dfs_fd* fd;

+	struct dfs_fd *fd;

 

 	fd = fd_get(d->fd);

 	if (fd == RT_NULL)

@@ -605,10 +616,10 @@ int closedir(DIR* d)
  */

 int chdir(const char *path)

 {

-	char* fullpath;

-	DIR* d;

+	char *fullpath;

+	DIR *d;

 

-	if(path == RT_NULL)

+	if (path == RT_NULL)

 	{

 		dfs_lock();

 		rt_kprintf("%s\n", working_directory);