2 * QEMU System Emulator block driver
4 * Copyright (c) 2003 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
44 struct BlockDriverState {
46 int64_t total_sectors;
49 BlockDriverState *bdrv_open(const char *filename)
55 bs = malloc(sizeof(BlockDriverState));
58 fd = open(filename, O_RDWR);
64 size = lseek64(fd, 0, SEEK_END);
65 bs->total_sectors = size / 512;
70 void bdrv_close(BlockDriverState *bs)
76 /* return -1 if error */
77 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
78 uint8_t *buf, int nb_sectors)
82 lseek64(bs->fd, sector_num * 512, SEEK_SET);
83 ret = read(bs->fd, buf, nb_sectors * 512);
84 if (ret != nb_sectors * 512)
90 /* return -1 if error */
91 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
92 const uint8_t *buf, int nb_sectors)
96 lseek64(bs->fd, sector_num * 512, SEEK_SET);
97 ret = write(bs->fd, buf, nb_sectors * 512);
98 if (ret != nb_sectors * 512)
104 void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
106 *nb_sectors_ptr = bs->total_sectors;