add full path options (DFS_FS_FLAG_FULLPATH) to the file system.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1904 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/dfs/filesystems/devfs/devfs.c

@@ -248,6 +248,7 @@ int dfs_device_fs_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t
 static const struct dfs_filesystem_operation _device_fs = 
 {
 	"devfs",
+	DFS_FS_FLAG_DEFAULT,
 	dfs_device_fs_mount,
 	RT_NULL,
 	RT_NULL,

components/dfs/filesystems/elmfat/dfs_elm.c

@@ -647,6 +647,7 @@ int dfs_elm_stat(struct dfs_filesystem *fs, const char *path, struct stat *st)
 static const struct dfs_filesystem_operation dfs_elm =
 {
 	"elm",
+	DFS_FS_FLAG_DEFAULT,
 	dfs_elm_mount,
 	dfs_elm_unmount,
 	dfs_elm_mkfs,

components/dfs/filesystems/nfs/dfs_nfs.c

@@ -1056,7 +1056,8 @@ int nfs_getdents(struct dfs_fd *file, struct dirent *dirp, rt_uint32_t count)
 
 static const struct dfs_filesystem_operation _nfs = 
 {
-	"nfs", 
+	"nfs",
+	DFS_FS_FLAG_DEFAULT,	
 	nfs_mount,
 	nfs_unmount,
 	RT_NULL, /* mkfs */

components/dfs/filesystems/skeleton/skeleton.c

@@ -55,6 +55,7 @@ int dfs_skt_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count
 static const struct dfs_filesystem_operation _skt_fs = 
 {
 	"skt",
+	DFS_FS_FLAG_DEFAULT,
 	dfs_skt_mount,
 	dfs_skt_unmount,
 	RT_NULL,

components/dfs/include/dfs_fs.h

@@ -17,6 +17,9 @@
 
 #include <dfs_def.h>
 
+#define DFS_FS_FLAG_DEFAULT		0x00	/* default flag */
+#define DFS_FS_FLAG_FULLPATH	0x01	/* set full path to underlaying file system */
+
 /* Pre-declaration */
 struct dfs_filesystem;
 struct dfs_fd;
@@ -25,6 +28,7 @@ struct dfs_fd;
 struct dfs_filesystem_operation
 {
 	char *name;
+	rt_uint32_t flags;		/* flags for file system operations */
 
 	/* mount and unmount file system */
 	int (*mount)	(struct dfs_filesystem *fs, unsigned long rwflag, const void *data);

components/dfs/src/dfs_file.c

@@ -66,13 +66,20 @@ int dfs_file_open(struct dfs_fd *fd, const char *path, int flags)
 	fd->size = 0;
 	fd->pos = 0;
 
-	if (dfs_subdir(fs->path, fullpath) == RT_NULL)
-		fd->path = rt_strdup("/");
+	if (!(fs->ops->flags & DFS_FS_FLAG_FULLPATH))
+	{
+		if (dfs_subdir(fs->path, fullpath) == RT_NULL)
+			fd->path = rt_strdup("/");
+		else
+			fd->path = rt_strdup(dfs_subdir(fs->path, fullpath));
+		rt_free(fullpath);
+		dfs_log(DFS_DEBUG_INFO, ("Actual file path: %s\n", fd->path));
+	}
 	else
-		fd->path = rt_strdup(dfs_subdir(fs->path, fullpath));
-	rt_free(fullpath);
-	dfs_log(DFS_DEBUG_INFO, ("Actual file path: %s\n", fd->path));
-
+	{
+		fd->path = fullpath;	
+	}
+	
 	/* specific file system open routine */
 	if (fs->ops->open == RT_NULL)
 	{
@@ -241,10 +248,15 @@ int dfs_file_unlink(const char *path)
 
 	if (fs->ops->unlink != RT_NULL)
 	{
-		if (dfs_subdir(fs->path, fullpath) == RT_NULL)
-			result = fs->ops->unlink(fs, "/");
+		if (!(fs->ops->flags & DFS_FS_FLAG_FULLPATH))
+		{
+			if (dfs_subdir(fs->path, fullpath) == RT_NULL)
+				result = fs->ops->unlink(fs, "/");
+			else
+				result = fs->ops->unlink(fs, dfs_subdir(fs->path, fullpath));
+		}
 		else
-			result = fs->ops->unlink(fs, dfs_subdir(fs->path, fullpath));
+			result = fs->ops->unlink(fs, fullpath);				
 	}
 	else result = -DFS_STATUS_ENOSYS;
 
@@ -380,7 +392,11 @@ int dfs_file_stat(const char *path, struct stat *buf)
 		}
 
 		/* get the real file path and get file stat */
-		result = fs->ops->stat(fs, dfs_subdir(fs->path, fullpath), buf);
+		if (fs->ops->flags & DFS_FS_FLAG_FULLPATH)
+			result = fs->ops->stat(fs, fullpath, buf);	 
+		else
+			result = fs->ops->stat(fs, dfs_subdir(fs->path, fullpath), buf);
+			
 	}
 
 	rt_free(fullpath);