1// SPDX-License-Identifier: GPL-2.0
2/*
3 *  linux/fs/minix/file.c
4 *
5 *  Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 *  minix regular file handling primitives
8 */
9
10#include "minix.h"
11
12/*
13 * We have mostly NULLs here: the current defaults are OK for
14 * the minix filesystem.
15 */
16const struct file_operations minix_file_operations = {
17	.llseek		= generic_file_llseek,
18	.read_iter	= generic_file_read_iter,
19	.write_iter	= generic_file_write_iter,
20	.mmap		= generic_file_mmap,
21	.fsync		= generic_file_fsync,
22	.splice_read	= generic_file_splice_read,
23};
24
25static int minix_setattr(struct user_namespace *mnt_userns,
26			 struct dentry *dentry, struct iattr *attr)
27{
28	struct inode *inode = d_inode(dentry);
29	int error;
30
31	error = setattr_prepare(&init_user_ns, dentry, attr);
32	if (error)
33		return error;
34
35	if ((attr->ia_valid & ATTR_SIZE) &&
36	    attr->ia_size != i_size_read(inode)) {
37		error = inode_newsize_ok(inode, attr->ia_size);
38		if (error)
39			return error;
40
41		truncate_setsize(inode, attr->ia_size);
42		minix_truncate(inode);
43	}
44
45	setattr_copy(&init_user_ns, inode, attr);
46	mark_inode_dirty(inode);
47	return 0;
48}
49
50const struct inode_operations minix_file_inode_operations = {
51	.setattr	= minix_setattr,
52	.getattr	= minix_getattr,
53};
54