added vm pages functions based on file_cache

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18697 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/file_systems/dos/dosfs.c

@@ -1122,9 +1122,9 @@ static file_system_module_info sDosFileSystem = {
 	&dosfs_remove_vnode,
 
 	/* VM file access */
-	NULL,	//&fs_can_page,
+	&dosfs_can_page,
-	NULL,	//&fs_read_pages,
+	&dosfs_read_pages,
-	NULL,	//&fs_write_pages,
+	&dosfs_write_pages,
 
 	&dosfs_get_file_map,
 

src/add-ons/kernel/file_systems/dos/file.c

@@ -1468,6 +1468,62 @@ dosfs_rmdir(void *vol, void *dir, const char *name)
 }
 
 
+bool
+dosfs_can_page(fs_volume _fs, fs_vnode _v, fs_cookie _cookie)
+{
+	// ToDo: we're obviously not even asked...
+	return false;
+}
+
+
+status_t
+dosfs_read_pages(fs_volume _fs, fs_vnode _node, fs_cookie _cookie, off_t pos,
+	const iovec *vecs, size_t count, size_t *_numBytes, bool reenter)
+{
+	nspace  *vol = (nspace *)_fs;
+	vnode   *node = (vnode *)_node;
+	status_t status;
+	
+	if (check_nspace_magic(vol, "dosfs_read_pages") ||
+                check_vnode_magic(node, "dosfs_read_pages"))
+                return EINVAL;
+
+	if (node->cache == NULL)
+		return(B_BAD_VALUE);
+
+	LOCK_VOL(vol);
+	status = file_cache_read_pages(node->cache, pos, vecs, count,
+		_numBytes);
+	UNLOCK_VOL(vol);
+
+	return status;
+}
+
+
+status_t
+dosfs_write_pages(fs_volume _fs, fs_vnode _node, fs_cookie _cookie, off_t pos,
+	const iovec *vecs, size_t count, size_t *_numBytes, bool reenter)
+{
+	nspace  *vol = (nspace *)_fs;
+	vnode   *node = (vnode *)_node;
+	status_t status;
+
+	if (check_nspace_magic(vol, "dosfs_write_pages") ||
+                check_vnode_magic(node, "dosfs_write_pages"))
+                return EINVAL;
+
+	if (node->cache == NULL)
+		return B_BAD_VALUE;
+
+	LOCK_VOL(vol);
+	status = file_cache_write_pages(node->cache, pos, vecs, count,
+		_numBytes);
+	UNLOCK_VOL(vol);
+
+	return status;
+}
+
+
 status_t
 dosfs_get_file_map(void *_fs, void *_node, off_t pos, size_t len,
 						struct file_io_vec *vecs, size_t *_count)

src/add-ons/kernel/file_systems/dos/file.h

@@ -29,5 +29,10 @@ status_t	dosfs_write(void *vol, void *node, void *cookie, off_t pos,
 						const void *buf, size_t *len);
 status_t	dosfs_get_file_map(void *fs, void *node, off_t pos, size_t reqLen,
 						struct file_io_vec *vecs, size_t *_count);
+bool		dosfs_can_page(fs_volume _fs, fs_vnode _v, fs_cookie _cookie);
+status_t	dosfs_read_pages(fs_volume _fs, fs_vnode _node, fs_cookie _cookie, off_t pos,
+				const iovec *vecs, size_t count, size_t *_numBytes, bool reenter);
+status_t	dosfs_write_pages(fs_volume _fs, fs_vnode _node, fs_cookie _cookie, off_t pos,
+				const iovec *vecs, size_t count, size_t *_numBytes, bool reenter);
 
 #endif