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