1// SPDX-License-Identifier: GPL-2.0
2/*
3 *  linux/fs/sysv/file.c
4 *
5 *  minix/file.c
6 *  Copyright (C) 1991, 1992  Linus Torvalds
7 *
8 *  coh/file.c
9 *  Copyright (C) 1993  Pascal Haible, Bruno Haible
10 *
11 *  sysv/file.c
12 *  Copyright (C) 1993  Bruno Haible
13 *
14 *  SystemV/Coherent regular file handling primitives
15 */
16
17#include "sysv.h"
18
19/*
20 * We have mostly NULLs here: the current defaults are OK for
21 * the coh filesystem.
22 */
23const struct file_operations sysv_file_operations = {
24	.llseek		= generic_file_llseek,
25	.read_iter	= generic_file_read_iter,
26	.write_iter	= generic_file_write_iter,
27	.mmap		= generic_file_mmap,
28	.fsync		= generic_file_fsync,
29	.splice_read	= generic_file_splice_read,
30};
31
32static int sysv_setattr(struct user_namespace *mnt_userns,
33			struct dentry *dentry, struct iattr *attr)
34{
35	struct inode *inode = d_inode(dentry);
36	int error;
37
38	error = setattr_prepare(&init_user_ns, dentry, attr);
39	if (error)
40		return error;
41
42	if ((attr->ia_valid & ATTR_SIZE) &&
43	    attr->ia_size != i_size_read(inode)) {
44		error = inode_newsize_ok(inode, attr->ia_size);
45		if (error)
46			return error;
47		truncate_setsize(inode, attr->ia_size);
48		sysv_truncate(inode);
49	}
50
51	setattr_copy(&init_user_ns, inode, attr);
52	mark_inode_dirty(inode);
53	return 0;
54}
55
56const struct inode_operations sysv_file_inode_operations = {
57	.setattr	= sysv_setattr,
58	.getattr	= sysv_getattr,
59};
60