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, offset: attr->ia_size); |
45 | if (error) |
46 | return error; |
47 | truncate_setsize(inode, newsize: 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 | |