[Qemu-devel] [PATCH] Parallels disk image support

[Alex Beregszaszi <alex@fsn.hu>]

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Hi,

attached patch adds support for reading from Parallels disk images.

--
Alex


[-- Attachment #2: block-parallels.diff --]
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Index: Changelog
===================================================================
RCS file: /sources/qemu/qemu/Changelog,v
retrieving revision 1.137
diff -u -r1.137 Changelog
--- Changelog	25 Jun 2007 11:41:37 -0000	1.137
+++ Changelog	27 Jul 2007 00:25:38 -0000
@@ -10,6 +10,7 @@
   - Improved SH4 support (Magnus Damm)
   - MIPS64 support (Aurelien Jarno, Thiemo Seufer)
   - Preliminary Alpha guest support (J. Mayer)
+  - Read-only support for Parallels disk images (Alex Beregszaszi)
 
 version 0.9.0:
 
Index: Makefile
===================================================================
RCS file: /sources/qemu/qemu/Makefile,v
retrieving revision 1.120
diff -u -r1.120 Makefile
--- Makefile	17 Jun 2007 16:41:04 -0000	1.120
+++ Makefile	27 Jul 2007 00:25:38 -0000
@@ -32,7 +32,7 @@
 
 recurse-all: $(patsubst %,subdir-%, $(TARGET_DIRS))
 
-qemu-img$(EXESUF): qemu-img.c cutils.c block.c block-raw.c block-cow.c block-qcow.c aes.c block-vmdk.c block-cloop.c block-dmg.c block-bochs.c block-vpc.c block-vvfat.c block-qcow2.c
+qemu-img$(EXESUF): qemu-img.c cutils.c block.c block-raw.c block-cow.c block-qcow.c aes.c block-vmdk.c block-cloop.c block-dmg.c block-bochs.c block-vpc.c block-vvfat.c block-qcow2.c block-parallels.c
 	$(CC) -DQEMU_TOOL $(CFLAGS) $(CPPFLAGS) $(BASE_CFLAGS) $(LDFLAGS) $(BASE_LDFLAGS) -o $@ $^ -lz $(LIBS)
 
 dyngen$(EXESUF): dyngen.c
Index: Makefile.target
===================================================================
RCS file: /sources/qemu/qemu/Makefile.target,v
retrieving revision 1.187
diff -u -r1.187 Makefile.target
--- Makefile.target	12 Jul 2007 09:29:18 -0000	1.187
+++ Makefile.target	27 Jul 2007 00:25:39 -0000
@@ -367,7 +367,7 @@
 VL_OBJS+=cutils.o
 VL_OBJS+=host-utils.o
 VL_OBJS+=block.o block-raw.o
-VL_OBJS+=block-cow.o block-qcow.o aes.o block-vmdk.o block-cloop.o block-dmg.o block-bochs.o block-vpc.o block-vvfat.o block-qcow2.o
+VL_OBJS+=block-cow.o block-qcow.o aes.o block-vmdk.o block-cloop.o block-dmg.o block-bochs.o block-vpc.o block-vvfat.o block-qcow2.o block-parallels.o
 VL_OBJS+=irq.o
 ifdef CONFIG_WIN32
 VL_OBJS+=tap-win32.o
Index: block.c
===================================================================
RCS file: /sources/qemu/qemu/block.c,v
retrieving revision 1.43
diff -u -r1.43 block.c
--- block.c	11 Feb 2007 15:06:09 -0000	1.43
+++ block.c	27 Jul 2007 00:25:42 -0000
@@ -1241,6 +1241,7 @@
     bdrv_register(&bdrv_vpc);
     bdrv_register(&bdrv_vvfat);
     bdrv_register(&bdrv_qcow2);
+    bdrv_register(&bdrv_parallels);
 }
 
 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
Index: vl.h
===================================================================
RCS file: /sources/qemu/qemu/vl.h,v
retrieving revision 1.256
diff -u -r1.256 vl.h
--- vl.h	11 Jul 2007 23:14:59 -0000	1.256
+++ vl.h	27 Jul 2007 00:25:46 -0000
@@ -569,6 +569,7 @@
 extern BlockDriver bdrv_vpc;
 extern BlockDriver bdrv_vvfat;
 extern BlockDriver bdrv_qcow2;
+extern BlockDriver bdrv_parallels;
 
 typedef struct BlockDriverInfo {
     /* in bytes, 0 if irrelevant */

[-- Attachment #3: block-parallels.c --]
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/*
 * Block driver for Parallels disk image format
 * 
 * Copyright (c) 2007 Alex Beregszaszi
 *
 * This code is based on comparing different disk images created by Parallels.
 * 
 * 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 "WithoutFreeSpace"
#define HEADER_VERSION 2
#define HEADER_SIZE 64

// always little-endian
struct parallels_header {
    char magic[16]; // "WithoutFreeSpace"
    uint32_t version;
    uint32_t heads;
    uint32_t cylinders;
    uint32_t tracks;
    uint32_t catalog_entries;
    uint32_t nb_sectors;
    char padding[24];
} __attribute__((packed));

typedef struct BDRVParallelsState {
    int fd;

    uint32_t *catalog_bitmap;
    int catalog_size;

    int tracks;    
} BDRVParallelsState;

static int parallels_probe(const uint8_t *buf, int buf_size, const char *filename)
{
    const struct parallels_header *ph = (const void *)buf;
    
    if (buf_size < HEADER_SIZE)
	return 0;

    if (!memcmp(ph->magic, HEADER_MAGIC, 16) &&
	(le32_to_cpu(ph->version) == HEADER_VERSION))
	return 100;

    return 0;
}

static int parallels_open(BlockDriverState *bs, const char *filename, int flags)
{
    BDRVParallelsState *s = bs->opaque;
    int fd, i;
    struct parallels_header ph;

    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, &ph, sizeof(ph)) != sizeof(ph))
        goto fail;

    if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
	(le32_to_cpu(ph.version) != HEADER_VERSION)) {
        goto fail;
    }

    bs->total_sectors = le32_to_cpu(ph.nb_sectors);

    if (lseek(s->fd, 64, SEEK_SET) != 64)
	goto fail;

    s->tracks = le32_to_cpu(ph.tracks);

    s->catalog_size = le32_to_cpu(ph.catalog_entries);
    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]);

    return 0;
fail:
    if (s->catalog_bitmap)
	qemu_free(s->catalog_bitmap);
    close(fd);
    return -1;
}

static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num)
{
    BDRVParallelsState *s = bs->opaque;
    uint32_t index, offset, position;

    index = sector_num / s->tracks;
    offset = sector_num % s->tracks;

    // not allocated
    if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
	return -1;

    position = (s->catalog_bitmap[index] + offset) * 512;

//    fprintf(stderr, "sector: %llx index=%x offset=%x pointer=%x position=%x\n",
//	sector_num, index, offset, s->catalog_bitmap[index], position); 

    if (lseek(s->fd, position, SEEK_SET) != position)
	return -1;

    return 0;
}

static int parallels_read(BlockDriverState *bs, int64_t sector_num, 
                    uint8_t *buf, int nb_sectors)
{
    BDRVParallelsState *s = bs->opaque;

    while (nb_sectors > 0) {
	if (!seek_to_sector(bs, sector_num)) {
	    if (read(s->fd, buf, 512) != 512)
		return -1;
	} else
            memset(buf, 0, 512);
        nb_sectors--;
        sector_num++;
        buf += 512;
    }
    return 0;
}

static void parallels_close(BlockDriverState *bs)
{
    BDRVParallelsState *s = bs->opaque;
    qemu_free(s->catalog_bitmap);
    close(s->fd);
}

BlockDriver bdrv_parallels = {
    "parallels",
    sizeof(BDRVParallelsState),
    parallels_probe,
    parallels_open,
    parallels_read,
    NULL,
    parallels_close,
};