[PATCH 4.18 50/53] Revert "vfs: fix freeze protection in mnt_want_write_file() for overlayfs"

[Greg Kroah-Hartman]

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Greg Kroah-Hartman <gre...@linuxfoundation.org>

This reverts commit 5e1002ab5c9bde81a0c1eed12f243987e98f7bd0 which was
commit a6795a585929d94ca3e931bc8518f8deb8bbe627 upstream.

Turns out this causes problems and was to fix a patch only in the 4.19
and newer tree.

Reported-by: Amir Goldstein <amir7...@gmail.com>
Cc: Miklos Szeredi <mszer...@redhat.com>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 fs/namespace.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -446,10 +446,10 @@ int mnt_want_write_file_path(struct file
 {
        int ret;
 
-       sb_start_write(file_inode(file)->i_sb);
+       sb_start_write(file->f_path.mnt->mnt_sb);
        ret = __mnt_want_write_file(file);
        if (ret)
-               sb_end_write(file_inode(file)->i_sb);
+               sb_end_write(file->f_path.mnt->mnt_sb);
        return ret;
 }
 
@@ -540,8 +540,7 @@ void __mnt_drop_write_file(struct file *
 
 void mnt_drop_write_file_path(struct file *file)
 {
-       __mnt_drop_write_file(file);
-       sb_end_write(file_inode(file)->i_sb);
+       mnt_drop_write(file->f_path.mnt);
 }
 
 void mnt_drop_write_file(struct file *file)