1 /*
2 * linux/fs/ufs/file.c
3 *
4 * Copyright (C) 1998
5 * Daniel Pirkl <daniel.pirkl@email.cz>
6 * Charles University, Faculty of Mathematics and Physics
7 *
8 * from
9 *
10 * linux/fs/ext2/file.c
11 *
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise Pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 *
17 * from
18 *
19 * linux/fs/minix/file.c
20 *
21 * Copyright (C) 1991, 1992 Linus Torvalds
22 *
23 * ext2 fs regular file handling primitives
24 */
25
26 #include <asm/uaccess.h>
27 #include <asm/system.h>
28
29 #include <linux/errno.h>
30 #include <linux/fs.h>
31 #include <linux/ufs_fs.h>
32 #include <linux/fcntl.h>
33 #include <linux/sched.h>
34 #include <linux/stat.h>
35 #include <linux/locks.h>
36 #include <linux/mm.h>
37 #include <linux/pagemap.h>
38
39 /*
40 * Make sure the offset never goes beyond the 32-bit mark..
41 */
42 static long long ufs_file_lseek(
43 struct file *file,
44 long long offset,
45 int origin )
46 {
47 long long retval;
48 struct inode *inode = file->f_dentry->d_inode;
49
50 switch (origin) {
51 case 2:
52 offset += inode->i_size;
53 break;
54 case 1:
55 offset += file->f_pos;
56 }
57 retval = -EINVAL;
58 /* make sure the offset fits in 32 bits */
59 if (((unsigned long long) offset >> 32) == 0) {
60 if (offset != file->f_pos) {
61 file->f_pos = offset;
62 file->f_reada = 0;
63 file->f_version = ++event;
64 }
65 retval = offset;
66 }
67 return retval;
68 }
69
70 /*
71 * We have mostly NULL's here: the current defaults are ok for
72 * the ufs filesystem.
73 */
74 struct file_operations ufs_file_operations = {
75 llseek: ufs_file_lseek,
76 read: generic_file_read,
77 write: generic_file_write,
78 mmap: generic_file_mmap,
79 };
80
81 struct inode_operations ufs_file_inode_operations = {
82 truncate: ufs_truncate,
83 };
84
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