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authorMiklos Szeredi <mszeredi@redhat.com>2018-07-18 16:44:43 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2018-07-18 16:44:43 +0300
commita6795a585929d94ca3e931bc8518f8deb8bbe627 (patch)
tree2100887e833fb600b0ff58fd2de05beb83b24d34 /fs/namespace.c
parent6742cee04353231015ddbe7e8b404ac9c1eb4473 (diff)
downloadlinux-a6795a585929d94ca3e931bc8518f8deb8bbe627.tar.xz
vfs: fix freeze protection in mnt_want_write_file() for overlayfs
The underlying real file used by overlayfs still contains the overlay path. This results in mnt_want_write_file() calls by the filesystem getting freeze protection on the wrong inode (the overlayfs one instead of the real one). Fix by using file_inode(file)->i_sb instead of file->f_path.mnt->mnt_sb. Reported-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/namespace.c')
-rw-r--r--fs/namespace.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index c16921dba157..9be2e938d36f 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -441,10 +441,10 @@ int mnt_want_write_file(struct file *file)
{
int ret;
- sb_start_write(file->f_path.mnt->mnt_sb);
+ sb_start_write(file_inode(file)->i_sb);
ret = __mnt_want_write_file(file);
if (ret)
- sb_end_write(file->f_path.mnt->mnt_sb);
+ sb_end_write(file_inode(file)->i_sb);
return ret;
}
EXPORT_SYMBOL_GPL(mnt_want_write_file);
@@ -486,7 +486,8 @@ void __mnt_drop_write_file(struct file *file)
void mnt_drop_write_file(struct file *file)
{
- mnt_drop_write(file->f_path.mnt);
+ __mnt_drop_write_file(file);
+ sb_end_write(file_inode(file)->i_sb);
}
EXPORT_SYMBOL(mnt_drop_write_file);