MCL/sf/adapt/qemu: comparison symbian-qemu-0.9.1-12/qemu-symbian-svp/block-bochs.c

equal deleted inserted replaced

-:ffa851df0825
+:2fb8b9db1c86
+/*
+* 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-common.h"
+#include "block_int.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_v1 {
+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;
+};
+// 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
+	    uint32_t reserved; // for ???
+	    uint64_t disk; // disk size
+	    char padding[HEADER_SIZE - 64 - 8 - 24];
+	} 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) ||
+	(le32_to_cpu(bochs->version) == HEADER_V1)))
+	return 100;
+return 0;
+}
+static int bochs_open(BlockDriverState *bs, const char *filename, int flags)
+{
+BDRVBochsState *s = bs->opaque;
+int fd, i;
+struct bochs_header bochs;
+struct bochs_header_v1 header_v1;
+fd = open(filename, O_RDWR | O_BINARY);
+if (fd < 0) {
+fd = open(filename, O_RDONLY | O_BINARY);
+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) &&
+	(le32_to_cpu(bochs.version) != HEADER_V1))) {
+goto fail;
+}
+if (le32_to_cpu(bochs.version) == HEADER_V1) {
+memcpy(&header_v1, &bochs, sizeof(bochs));
+bs->total_sectors = le64_to_cpu(header_v1.extra.redolog.disk) / 512;
+} else {
+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,
+};