117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/*
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <getopt.h>
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#include <inttypes.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <time.h>
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#include <sys/time.h>
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#include <malloc.h>
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#include <termios.h>
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#include <sys/poll.h>
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#include <errno.h>
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#include <sys/wait.h>
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#include "vl.h"
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struct BlockDriverState {
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int fd;
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int64_t total_sectors;
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int read_only;
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};
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BlockDriverState *bdrv_open(const char *filename)
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{
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BlockDriverState *bs;
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int fd;
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int64_t size;
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bs = malloc(sizeof(BlockDriverState));
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if(!bs)
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return NULL;
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bs->read_only = 0;
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fd = open(filename, O_RDWR);
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if (fd < 0) {
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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close(fd);
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free(bs);
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return NULL;
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}
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bs->read_only = 1;
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}
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size = lseek64(fd, 0, SEEK_END);
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bs->total_sectors = size / 512;
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bs->fd = fd;
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return bs;
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}
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void bdrv_close(BlockDriverState *bs)
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{
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close(bs->fd);
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free(bs);
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}
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/* return -1 if error */
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int bdrv_read(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors)
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{
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int ret;
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lseek64(bs->fd, sector_num * 512, SEEK_SET);
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ret = read(bs->fd, buf, nb_sectors * 512);
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if (ret != nb_sectors * 512)
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return -1;
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else
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return 0;
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}
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/* return -1 if error */
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int bdrv_write(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors)
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{
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int ret;
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if (bs->read_only)
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return -1;
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lseek64(bs->fd, sector_num * 512, SEEK_SET);
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ret = write(bs->fd, buf, nb_sectors * 512);
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if (ret != nb_sectors * 512)
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return -1;
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else
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return 0;
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}
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void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
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{
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*nb_sectors_ptr = bs->total_sectors;
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}
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