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Commit de30dfd6 authored by Miklos Szeredi's avatar Miklos Szeredi
Browse files

ovl: add ovl_fsync() 



Implement stacked fsync().

Don't sync if lower (noticed by Amir Goldstein).

Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 2a92e07e

fs/overlayfs/file.c

+23 −0
Original line number Diff line number Diff line
@@ -233,10 +233,33 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter) 
	return ret;

}



static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync)

{

	struct fd real;

	const struct cred *old_cred;

	int ret;



	ret = ovl_real_fdget(file, &real);

	if (ret)

		return ret;



	/* Don't sync lower file for fear of receiving EROFS error */

	if (file_inode(real.file) == ovl_inode_upper(file_inode(file))) {

		old_cred = ovl_override_creds(file_inode(file)->i_sb);

		ret = vfs_fsync_range(real.file, start, end, datasync);

		revert_creds(old_cred);

	}



	fdput(real);



	return ret;

}



const struct file_operations ovl_file_operations = {

	.open		= ovl_open,

	.release	= ovl_release,

	.llseek		= ovl_llseek,

	.read_iter	= ovl_read_iter,

	.write_iter	= ovl_write_iter,

	.fsync		= ovl_fsync,

};