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 */
23 const 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 = filemap_splice_read,
30 };
31
32 static int sysv_setattr(struct mnt_idmap *idmap,
33 struct dentry *dentry, struct iattr *attr)
34 {
35 struct inode *inode = d_inode(dentry);
36 int error;
37
38 error = setattr_prepare(&nop_mnt_idmap, 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(&nop_mnt_idmap, inode, attr);
52 mark_inode_dirty(inode);
53 return 0;
54 }
55
56 const struct inode_operations sysv_file_inode_operations = {
57 .setattr = sysv_setattr,
58 .getattr = sysv_getattr,
59 };
60
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