--- /dev/null
+/*
+ * 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 "vl.h"
+#include "block_int.h"
+
+/**************************************************************/
+
+#define HEADER_MAGIC "Bochs Virtual HD Image"
+#define HEADER_VERSION 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
+
+ union {
+ struct {
+ uint32_t catalog; // num of entries
+ uint32_t bitmap; // bitmap size
+ uint32_t extent; // extent size
+ uint64_t disk; // disk size
+ char padding[HEADER_SIZE - 64 - 8 - 20];
+ } redolog;
+ char padding[HEADER_SIZE - 64 - 8];
+ } extra;
+};
+
+typedef struct BDRVBochsState {
+ int fd;
+
+ uint32_t *catalog_bitmap;
+ int catalog_size;
+
+ int data_offset;
+
+ int bitmap_blocks;
+ int extent_blocks;
+ int 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))
+ return 100;
+
+ return 0;
+}
+
+static int bochs_open(BlockDriverState *bs, const char *filename)
+{
+ BDRVBochsState *s = bs->opaque;
+ int fd, i;
+ struct bochs_header bochs;
+
+ fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
+ if (fd < 0) {
+ fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
+ if (fd < 0)
+ return -1;
+ }
+
+ bs->read_only = 1; // no write support yet
+
+ s->fd = fd;
+
+ if (read(fd, &bochs, sizeof(bochs)) != sizeof(bochs)) {
+ goto fail;
+ }
+
+ if (strcmp(bochs.magic, HEADER_MAGIC) ||
+ strcmp(bochs.type, REDOLOG_TYPE) ||
+ strcmp(bochs.subtype, GROWING_TYPE) ||
+ (le32_to_cpu(bochs.version) != HEADER_VERSION)) {
+ goto fail;
+ }
+
+ bs->total_sectors = le64_to_cpu(bochs.extra.redolog.disk) / 512;
+
+ lseek(s->fd, le32_to_cpu(bochs.header), SEEK_SET);
+
+ s->catalog_size = le32_to_cpu(bochs.extra.redolog.catalog);
+ s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
+ if (!s->catalog_bitmap)
+ goto fail;
+ if (read(s->fd, s->catalog_bitmap, s->catalog_size * 4) !=
+ s->catalog_size * 4)
+ 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.extra.redolog.bitmap) - 1) / 512;
+ s->extent_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.extent) - 1) / 512;
+
+ s->extent_size = le32_to_cpu(bochs.extra.redolog.extent);
+
+ return 0;
+ fail:
+ close(fd);
+ return -1;
+}
+
+static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num)
+{
+ BDRVBochsState *s = bs->opaque;
+ int64_t offset = sector_num * 512;
+ int64_t extent_index, extent_offset, bitmap_offset, block_offset;
+ char bitmap_entry;
+
+ // seek to sector
+ extent_index = offset / s->extent_size;
+ extent_offset = (offset % s->extent_size) / 512;
+
+ if (s->catalog_bitmap[extent_index] == 0xffffffff)
+ {
+// fprintf(stderr, "page not allocated [%x - %x:%x]\n",
+// sector_num, extent_index, extent_offset);
+ return -1; // not allocated
+ }
+
+ bitmap_offset = s->data_offset + (512 * s->catalog_bitmap[extent_index] *
+ (s->extent_blocks + s->bitmap_blocks));
+ block_offset = bitmap_offset + (512 * (s->bitmap_blocks + extent_offset));
+
+// fprintf(stderr, "sect: %x [ext i: %x o: %x] -> %x bitmap: %x block: %x\n",
+// sector_num, extent_index, extent_offset,
+// le32_to_cpu(s->catalog_bitmap[extent_index]),
+// bitmap_offset, block_offset);
+
+ // read in bitmap for current extent
+ lseek(s->fd, bitmap_offset + (extent_offset / 8), SEEK_SET);
+
+ read(s->fd, &bitmap_entry, 1);
+
+ if (!((bitmap_entry >> (extent_offset % 8)) & 1))
+ {
+// fprintf(stderr, "sector (%x) in bitmap not allocated\n",
+// sector_num);
+ return -1; // not allocated
+ }
+
+ lseek(s->fd, block_offset, SEEK_SET);
+
+ return 0;
+}
+
+static int bochs_read(BlockDriverState *bs, int64_t sector_num,
+ uint8_t *buf, int nb_sectors)
+{
+ BDRVBochsState *s = bs->opaque;
+ int ret;
+
+ while (nb_sectors > 0) {
+ if (!seek_to_sector(bs, sector_num))
+ {
+ ret = read(s->fd, buf, 512);
+ if (ret != 512)
+ return -1;
+ }
+ else
+ memset(buf, 0, 512);
+ nb_sectors--;
+ sector_num++;
+ buf += 512;
+ }
+ return 0;
+}
+
+static void bochs_close(BlockDriverState *bs)
+{
+ BDRVBochsState *s = bs->opaque;
+ qemu_free(s->catalog_bitmap);
+ close(s->fd);
+}
+
+BlockDriver bdrv_bochs = {
+ "bochs",
+ sizeof(BDRVBochsState),
+ bochs_probe,
+ bochs_open,
+ bochs_read,
+ NULL,
+ bochs_close,
+};
projects / qemu / commitdiff