xref: /linux/fs/sysv/file.c (revision bb9707077b4ee5f77bc9939b057ff8a0d410296f)
1 /*
2  *  linux/fs/sysv/file.c
3  *
4  *  minix/file.c
5  *  Copyright (C) 1991, 1992  Linus Torvalds
6  *
7  *  coh/file.c
8  *  Copyright (C) 1993  Pascal Haible, Bruno Haible
9  *
10  *  sysv/file.c
11  *  Copyright (C) 1993  Bruno Haible
12  *
13  *  SystemV/Coherent regular file handling primitives
14  */
15 
16 #include "sysv.h"
17 
18 /*
19  * We have mostly NULLs here: the current defaults are OK for
20  * the coh filesystem.
21  */
22 const struct file_operations sysv_file_operations = {
23 	.llseek		= generic_file_llseek,
24 	.read_iter	= generic_file_read_iter,
25 	.write_iter	= generic_file_write_iter,
26 	.mmap		= generic_file_mmap,
27 	.fsync		= generic_file_fsync,
28 	.splice_read	= generic_file_splice_read,
29 };
30 
31 static int sysv_setattr(struct dentry *dentry, struct iattr *attr)
32 {
33 	struct inode *inode = d_inode(dentry);
34 	int error;
35 
36 	error = inode_change_ok(inode, attr);
37 	if (error)
38 		return error;
39 
40 	if ((attr->ia_valid & ATTR_SIZE) &&
41 	    attr->ia_size != i_size_read(inode)) {
42 		error = inode_newsize_ok(inode, attr->ia_size);
43 		if (error)
44 			return error;
45 		truncate_setsize(inode, attr->ia_size);
46 		sysv_truncate(inode);
47 	}
48 
49 	setattr_copy(inode, attr);
50 	mark_inode_dirty(inode);
51 	return 0;
52 }
53 
54 const struct inode_operations sysv_file_inode_operations = {
55 	.setattr	= sysv_setattr,
56 	.getattr	= sysv_getattr,
57 };
58