fs/mount: add autodetection type support

if NULL is pass as type mount will try to autodetect the filesystem type

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

fs/Kconfig

@@ -1,6 +1,11 @@
 
 menu "Filesystem support            "
 
+config FS
+	bool
+	default y
+	select FILETYPE
+
 config FS_AUTOMOUNT
 	bool
 

fs/fs.c

@@ -954,6 +954,28 @@ int register_fs_driver(struct fs_driver_d *fsdrv)
 }
 EXPORT_SYMBOL(register_fs_driver);
 
+static const char *detect_fs(const char *filename)
+{
+	enum filetype type = file_name_detect_type(filename);
+	struct driver_d *drv;
+	struct fs_driver_d *fdrv;
+
+	if (type == filetype_unknown)
+		return NULL;
+
+	for_each_driver(drv) {
+		if (drv->bus != &fs_bus)
+			continue;
+
+		fdrv = drv_to_fs_driver(drv);
+
+		if (type == fdrv->type)
+			return drv->name;
+	}
+
+	return NULL;
+}
+
 /*
  * Mount a device to a directory.
  * We do this by registering a new device on which the filesystem
@@ -985,6 +1007,12 @@ int mount(const char *device, const char *fsname, const char *_path)
 		}
 	}
 
+	if (!fsname)
+		fsname = detect_fs(device);
+
+	if (!fsname)
+		return -ENOENT;
+
 	fsdev = xzalloc(sizeof(struct fs_device_d));
 	fsdev->backingstore = xstrdup(device);
 	safe_strncpy(fsdev->dev.name, fsname, MAX_DRIVER_NAME);
@@ -1222,7 +1250,7 @@ int rmdir (const char *pathname)
 
 	fsdev = get_fs_device_and_root_path(&p);
 	if (!fsdev) {
-		ret = -ENOENT;
+		ret = -ENODEV;
 		goto out;
 	}
 	fsdrv = fsdev->driver;

include/fs.h

@@ -2,6 +2,7 @@
 #define __FS_H
 
 #include <driver.h>
+#include <filetype.h>
 
 #define PATH_MAX       1024        /* include/linux/limits.h */
 
@@ -72,6 +73,8 @@ struct fs_driver_d {
 
 	struct driver_d drv;
 
+	enum filetype type;
+
 	unsigned long flags;
 };
 
@@ -93,6 +96,8 @@ struct fs_device_d {
 	struct list_head list;
 };
 
+#define drv_to_fs_driver(d) container_of(d, struct fs_driver_d, drv)
+
 /*
  * standard posix file functions
  */