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

Greg Kroah-Hartman
2018-10-18T17:54:43Z

From: Greg Kroah-Hartman <gregkh@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 <amir73il@gmail.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@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)