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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 |