]>
git.proxmox.com Git - qemu.git/blob - block.c
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
;
50 BlockDriverState
*bdrv_open(const char *filename
)
56 bs
= malloc(sizeof(BlockDriverState
));
60 fd
= open(filename
, O_RDWR
);
62 fd
= open(filename
, O_RDONLY
);
70 size
= lseek64(fd
, 0, SEEK_END
);
71 bs
->total_sectors
= size
/ 512;
76 void bdrv_close(BlockDriverState
*bs
)
82 /* return -1 if error */
83 int bdrv_read(BlockDriverState
*bs
, int64_t sector_num
,
84 uint8_t *buf
, int nb_sectors
)
88 lseek64(bs
->fd
, sector_num
* 512, SEEK_SET
);
89 ret
= read(bs
->fd
, buf
, nb_sectors
* 512);
90 if (ret
!= nb_sectors
* 512)
96 /* return -1 if error */
97 int bdrv_write(BlockDriverState
*bs
, int64_t sector_num
,
98 const uint8_t *buf
, int nb_sectors
)
105 lseek64(bs
->fd
, sector_num
* 512, SEEK_SET
);
106 ret
= write(bs
->fd
, buf
, nb_sectors
* 512);
107 if (ret
!= nb_sectors
* 512)
113 void bdrv_get_geometry(BlockDriverState
*bs
, int64_t *nb_sectors_ptr
)
115 *nb_sectors_ptr
= bs
->total_sectors
;