vfs: Undo an overly zealous MS_RDONLY -> SB_RDONLY conversion

[ Upstream commit a9e5b73288cf1595ac2e05cf1acd1924ceea05fa ]

In do_mount() when the MS_* flags are being converted to MNT_* flags,
MS_RDONLY got accidentally convered to SB_RDONLY.

Undo this change.

Fixes: e462ec50cb5f ("VFS: Differentiate mount flags (MS_*) from internal superblock flags")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/namespace.c b/fs/namespace.c
index 62b17af..1eb3bfd 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2810,7 +2810,7 @@ long do_mount(const char *dev_name, const char __user *dir_name,
                mnt_flags |= MNT_NODIRATIME;
        if (flags & MS_STRICTATIME)
                mnt_flags &= ~(MNT_RELATIME | MNT_NOATIME);
-       if (flags & SB_RDONLY)
+       if (flags & MS_RDONLY)
                mnt_flags |= MNT_READONLY;
 
        /* The default atime for remount is preservation */