1 #ifndef _ZFTAPE_H
2 #define _ZFTAPE_H
3
4 /*
5 * Copyright (C) 1996, 1997 Claus-Justus Heine.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; see the file COPYING. If not, write to
19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
20
21 *
22 * $Source: /homes/cvs/ftape-stacked/include/linux/zftape.h,v $
23 * $Revision: 1.12 $
24 * $Date: 1997/10/21 11:02:37 $
25 *
26 * Special ioctl and other global info for the zftape VFS
27 * interface for the QIC-40/80/3010/3020 floppy-tape driver for
28 * Linux.
29 */
30
31 #define ZFTAPE_VERSION "zftape for " FTAPE_VERSION
32
33 #include <linux/ftape.h>
34
35 #define ZFTAPE_LABEL "Ftape - The Linux Floppy Tape Project!"
36
37 /* Bits of the minor device number that control the operation mode */
38 #define ZFT_Q80_MODE (1 << 3)
39 #define ZFT_ZIP_MODE (1 << 4)
40 #define ZFT_RAW_MODE (1 << 5)
41 #define ZFT_MINOR_OP_MASK (ZFT_Q80_MODE | \
42 ZFT_ZIP_MODE | \
43 ZFT_RAW_MODE)
44 #define ZFT_MINOR_MASK (FTAPE_SEL_MASK | \
45 ZFT_MINOR_OP_MASK | \
46 FTAPE_NO_REWIND)
47
48 #ifdef ZFT_OBSOLETE
49 struct mtblksz {
50 unsigned int mt_blksz;
51 };
52 #define MTIOC_ZFTAPE_GETBLKSZ _IOR('m', 104, struct mtblksz)
53 #endif
54
55 #ifdef __KERNEL__
56
57 extern int zft_init(void);
58
59 static inline __s64 zft_div_blksz(__s64 value, __u32 blk_sz)
60 {
61 if (blk_sz == 1) {
62 return value;
63 } else {
64 return (__s64)(((__u32)(value >> 10) + (blk_sz >> 10) - 1)
65 / (blk_sz >> 10));
66 }
67 }
68
69 static inline __s64 zft_mul_blksz(__s64 value, __u32 blk_sz)
70 {
71 if (blk_sz == 1) {
72 return value;
73 } else {
74 /* if blk_sz != 1, then it is a multiple of 1024. In
75 * this case, `value' will also fit into 32 bits.
76 *
77 * Actually, this limits the capacity to 42
78 * bits. This is (2^32)*1024, roughly a thousand
79 * times 2GB, or 3 Terabytes. Hopefully this is enough
80 */
81 return(__s64)(((__u32)(value)*(blk_sz>>10))<<10);
82 }
83 }
84
85 #endif
86
87 #endif
88
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