fs: Fix filesystem detection with full path

When mount is given a full path (including /dev/) to the cdev file
we can no longer automatically detect the filesystem. This is broken
since:

e89f1a1 detect_fs: use device instead of file

Fix it by dropping the /dev/ component of the path.

Signed-off-by: Peter Mamonov <pmamonov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/fs.c b/fs/fs.c
index c041e41bb5..c2a20e17d7 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -1201,10 +1201,14 @@ EXPORT_SYMBOL(register_fs_driver);
 
 static const char *detect_fs(const char *filename)
 {
-	enum filetype type = cdev_detect_type(filename);
+	enum filetype type;
 	struct driver_d *drv;
 	struct fs_driver_d *fdrv;
 
+	if (!strncmp(filename, "/dev/", 5))
+		filename += 5;
+	type = cdev_detect_type(filename);
+
 	if (type == filetype_unknown)
 		return NULL;