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fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #include <stdlib.h> | |
25 | #include <stdio.h> | |
26 | #include <stdarg.h> | |
27 | #include <string.h> | |
28 | #include <getopt.h> | |
29 | #include <inttypes.h> | |
30 | #include <unistd.h> | |
31 | #include <sys/mman.h> | |
32 | #include <fcntl.h> | |
33 | #include <signal.h> | |
34 | #include <time.h> | |
35 | #include <sys/time.h> | |
36 | #include <malloc.h> | |
37 | #include <termios.h> | |
38 | #include <sys/poll.h> | |
39 | #include <errno.h> | |
40 | #include <sys/wait.h> | |
41 | ||
42 | #include "vl.h" | |
43 | ||
44 | struct BlockDriverState { | |
45 | int fd; | |
46 | int64_t total_sectors; | |
0849bf08 | 47 | int read_only; |
fc01f7e7 FB |
48 | }; |
49 | ||
50 | BlockDriverState *bdrv_open(const char *filename) | |
51 | { | |
52 | BlockDriverState *bs; | |
53 | int fd; | |
54 | int64_t size; | |
55 | ||
56 | bs = malloc(sizeof(BlockDriverState)); | |
57 | if(!bs) | |
58 | return NULL; | |
0849bf08 | 59 | bs->read_only = 0; |
fc01f7e7 FB |
60 | fd = open(filename, O_RDWR); |
61 | if (fd < 0) { | |
0849bf08 FB |
62 | fd = open(filename, O_RDONLY); |
63 | if (fd < 0) { | |
64 | close(fd); | |
65 | free(bs); | |
66 | return NULL; | |
67 | } | |
68 | bs->read_only = 1; | |
fc01f7e7 FB |
69 | } |
70 | size = lseek64(fd, 0, SEEK_END); | |
71 | bs->total_sectors = size / 512; | |
72 | bs->fd = fd; | |
73 | return bs; | |
74 | } | |
75 | ||
76 | void bdrv_close(BlockDriverState *bs) | |
77 | { | |
78 | close(bs->fd); | |
79 | free(bs); | |
80 | } | |
81 | ||
82 | /* return -1 if error */ | |
83 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
84 | uint8_t *buf, int nb_sectors) | |
85 | { | |
86 | int ret; | |
87 | ||
88 | lseek64(bs->fd, sector_num * 512, SEEK_SET); | |
89 | ret = read(bs->fd, buf, nb_sectors * 512); | |
90 | if (ret != nb_sectors * 512) | |
91 | return -1; | |
92 | else | |
93 | return 0; | |
94 | } | |
95 | ||
96 | /* return -1 if error */ | |
97 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, | |
98 | const uint8_t *buf, int nb_sectors) | |
99 | { | |
100 | int ret; | |
101 | ||
0849bf08 FB |
102 | if (bs->read_only) |
103 | return -1; | |
104 | ||
fc01f7e7 FB |
105 | lseek64(bs->fd, sector_num * 512, SEEK_SET); |
106 | ret = write(bs->fd, buf, nb_sectors * 512); | |
107 | if (ret != nb_sectors * 512) | |
108 | return -1; | |
109 | else | |
110 | return 0; | |
111 | } | |
112 | ||
113 | void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr) | |
114 | { | |
115 | *nb_sectors_ptr = bs->total_sectors; | |
116 | } |