diff options
Diffstat (limited to 'qemu/block/bochs.c')
| -rw-r--r-- | qemu/block/bochs.c | 279 |
1 files changed, 0 insertions, 279 deletions
diff --git a/qemu/block/bochs.c b/qemu/block/bochs.c deleted file mode 100644 index af8b7abdf..000000000 --- a/qemu/block/bochs.c +++ /dev/null @@ -1,279 +0,0 @@ -/* - * Block driver for the various disk image formats used by Bochs - * Currently only for "growing" type in read-only mode - * - * Copyright (c) 2005 Alex Beregszaszi - * - * 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 "qemu/osdep.h" -#include "qapi/error.h" -#include "qemu-common.h" -#include "block/block_int.h" -#include "qemu/module.h" - -/**************************************************************/ - -#define HEADER_MAGIC "Bochs Virtual HD Image" -#define HEADER_VERSION 0x00020000 -#define HEADER_V1 0x00010000 -#define HEADER_SIZE 512 - -#define REDOLOG_TYPE "Redolog" -#define GROWING_TYPE "Growing" - -// not allocated: 0xffffffff - -// always little-endian -struct bochs_header { - char magic[32]; /* "Bochs Virtual HD Image" */ - char type[16]; /* "Redolog" */ - char subtype[16]; /* "Undoable" / "Volatile" / "Growing" */ - uint32_t version; - uint32_t header; /* size of header */ - - uint32_t catalog; /* num of entries */ - uint32_t bitmap; /* bitmap size */ - uint32_t extent; /* extent size */ - - union { - struct { - uint32_t reserved; /* for ??? */ - uint64_t disk; /* disk size */ - char padding[HEADER_SIZE - 64 - 20 - 12]; - } QEMU_PACKED redolog; - struct { - uint64_t disk; /* disk size */ - char padding[HEADER_SIZE - 64 - 20 - 8]; - } QEMU_PACKED redolog_v1; - char padding[HEADER_SIZE - 64 - 20]; - } extra; -} QEMU_PACKED; - -typedef struct BDRVBochsState { - CoMutex lock; - uint32_t *catalog_bitmap; - uint32_t catalog_size; - - uint32_t data_offset; - - uint32_t bitmap_blocks; - uint32_t extent_blocks; - uint32_t extent_size; -} BDRVBochsState; - -static int bochs_probe(const uint8_t *buf, int buf_size, const char *filename) -{ - const struct bochs_header *bochs = (const void *)buf; - - if (buf_size < HEADER_SIZE) - return 0; - - if (!strcmp(bochs->magic, HEADER_MAGIC) && - !strcmp(bochs->type, REDOLOG_TYPE) && - !strcmp(bochs->subtype, GROWING_TYPE) && - ((le32_to_cpu(bochs->version) == HEADER_VERSION) || - (le32_to_cpu(bochs->version) == HEADER_V1))) - return 100; - - return 0; -} - -static int bochs_open(BlockDriverState *bs, QDict *options, int flags, - Error **errp) -{ - BDRVBochsState *s = bs->opaque; - uint32_t i; - struct bochs_header bochs; - int ret; - - bs->read_only = 1; // no write support yet - - ret = bdrv_pread(bs->file->bs, 0, &bochs, sizeof(bochs)); - if (ret < 0) { - return ret; - } - - if (strcmp(bochs.magic, HEADER_MAGIC) || - strcmp(bochs.type, REDOLOG_TYPE) || - strcmp(bochs.subtype, GROWING_TYPE) || - ((le32_to_cpu(bochs.version) != HEADER_VERSION) && - (le32_to_cpu(bochs.version) != HEADER_V1))) { - error_setg(errp, "Image not in Bochs format"); - return -EINVAL; - } - - if (le32_to_cpu(bochs.version) == HEADER_V1) { - bs->total_sectors = le64_to_cpu(bochs.extra.redolog_v1.disk) / 512; - } else { - bs->total_sectors = le64_to_cpu(bochs.extra.redolog.disk) / 512; - } - - /* Limit to 1M entries to avoid unbounded allocation. This is what is - * needed for the largest image that bximage can create (~8 TB). */ - s->catalog_size = le32_to_cpu(bochs.catalog); - if (s->catalog_size > 0x100000) { - error_setg(errp, "Catalog size is too large"); - return -EFBIG; - } - - s->catalog_bitmap = g_try_new(uint32_t, s->catalog_size); - if (s->catalog_size && s->catalog_bitmap == NULL) { - error_setg(errp, "Could not allocate memory for catalog"); - return -ENOMEM; - } - - ret = bdrv_pread(bs->file->bs, le32_to_cpu(bochs.header), s->catalog_bitmap, - s->catalog_size * 4); - if (ret < 0) { - goto fail; - } - - for (i = 0; i < s->catalog_size; i++) - le32_to_cpus(&s->catalog_bitmap[i]); - - s->data_offset = le32_to_cpu(bochs.header) + (s->catalog_size * 4); - - s->bitmap_blocks = 1 + (le32_to_cpu(bochs.bitmap) - 1) / 512; - s->extent_blocks = 1 + (le32_to_cpu(bochs.extent) - 1) / 512; - - s->extent_size = le32_to_cpu(bochs.extent); - if (s->extent_size < BDRV_SECTOR_SIZE) { - /* bximage actually never creates extents smaller than 4k */ - error_setg(errp, "Extent size must be at least 512"); - ret = -EINVAL; - goto fail; - } else if (!is_power_of_2(s->extent_size)) { - error_setg(errp, "Extent size %" PRIu32 " is not a power of two", - s->extent_size); - ret = -EINVAL; - goto fail; - } else if (s->extent_size > 0x800000) { - error_setg(errp, "Extent size %" PRIu32 " is too large", - s->extent_size); - ret = -EINVAL; - goto fail; - } - - if (s->catalog_size < DIV_ROUND_UP(bs->total_sectors, - s->extent_size / BDRV_SECTOR_SIZE)) - { - error_setg(errp, "Catalog size is too small for this disk size"); - ret = -EINVAL; - goto fail; - } - - qemu_co_mutex_init(&s->lock); - return 0; - -fail: - g_free(s->catalog_bitmap); - return ret; -} - -static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num) -{ - BDRVBochsState *s = bs->opaque; - uint64_t offset = sector_num * 512; - uint64_t extent_index, extent_offset, bitmap_offset; - char bitmap_entry; - int ret; - - // seek to sector - extent_index = offset / s->extent_size; - extent_offset = (offset % s->extent_size) / 512; - - if (s->catalog_bitmap[extent_index] == 0xffffffff) { - return 0; /* not allocated */ - } - - bitmap_offset = s->data_offset + - (512 * (uint64_t) s->catalog_bitmap[extent_index] * - (s->extent_blocks + s->bitmap_blocks)); - - /* read in bitmap for current extent */ - ret = bdrv_pread(bs->file->bs, bitmap_offset + (extent_offset / 8), - &bitmap_entry, 1); - if (ret < 0) { - return ret; - } - - if (!((bitmap_entry >> (extent_offset % 8)) & 1)) { - return 0; /* not allocated */ - } - - return bitmap_offset + (512 * (s->bitmap_blocks + extent_offset)); -} - -static int bochs_read(BlockDriverState *bs, int64_t sector_num, - uint8_t *buf, int nb_sectors) -{ - int ret; - - while (nb_sectors > 0) { - int64_t block_offset = seek_to_sector(bs, sector_num); - if (block_offset < 0) { - return block_offset; - } else if (block_offset > 0) { - ret = bdrv_pread(bs->file->bs, block_offset, buf, 512); - if (ret < 0) { - return ret; - } - } else { - memset(buf, 0, 512); - } - nb_sectors--; - sector_num++; - buf += 512; - } - return 0; -} - -static coroutine_fn int bochs_co_read(BlockDriverState *bs, int64_t sector_num, - uint8_t *buf, int nb_sectors) -{ - int ret; - BDRVBochsState *s = bs->opaque; - qemu_co_mutex_lock(&s->lock); - ret = bochs_read(bs, sector_num, buf, nb_sectors); - qemu_co_mutex_unlock(&s->lock); - return ret; -} - -static void bochs_close(BlockDriverState *bs) -{ - BDRVBochsState *s = bs->opaque; - g_free(s->catalog_bitmap); -} - -static BlockDriver bdrv_bochs = { - .format_name = "bochs", - .instance_size = sizeof(BDRVBochsState), - .bdrv_probe = bochs_probe, - .bdrv_open = bochs_open, - .bdrv_read = bochs_co_read, - .bdrv_close = bochs_close, -}; - -static void bdrv_bochs_init(void) -{ - bdrv_register(&bdrv_bochs); -} - -block_init(bdrv_bochs_init); |