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-rw-r--r--qemu/block/bochs.c279
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);