Parallels has released in the recent updates of Parallels Server 5/6 new addition to his image format. Images with signature WithouFreSpacExt have offsets in the catalog coded not as offsets in sectors (multiple of 512 bytes) but offsets coded in blocks (i.e. header->tracks * 512) In this case all 64 bits of header->nb_sectors are used for image size. This patch implements support of this for qemu-img and also adds specific check for an incorrect image. Images with block size greater than INT_MAX/513 are not supported. The biggest available Parallels image cluster size in the field is 1 Mb. Thus this limit will not hurt anyone. Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Jeff Cody <jcody@redhat.com> CC: Kevin Wolf <kwolf@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
214 lines
5.9 KiB
C
214 lines
5.9 KiB
C
/*
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* Block driver for Parallels disk image format
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*
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* Copyright (c) 2007 Alex Beregszaszi
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*
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* This code is based on comparing different disk images created by Parallels.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h"
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#include "block/block_int.h"
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#include "qemu/module.h"
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/**************************************************************/
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#define HEADER_MAGIC "WithoutFreeSpace"
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#define HEADER_MAGIC2 "WithouFreSpacExt"
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#define HEADER_VERSION 2
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#define HEADER_SIZE 64
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// always little-endian
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struct parallels_header {
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char magic[16]; // "WithoutFreeSpace"
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uint32_t version;
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uint32_t heads;
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uint32_t cylinders;
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uint32_t tracks;
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uint32_t catalog_entries;
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uint64_t nb_sectors;
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uint32_t inuse;
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uint32_t data_off;
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char padding[12];
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} QEMU_PACKED;
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typedef struct BDRVParallelsState {
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CoMutex lock;
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uint32_t *catalog_bitmap;
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unsigned int catalog_size;
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unsigned int tracks;
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unsigned int off_multiplier;
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} BDRVParallelsState;
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static int parallels_probe(const uint8_t *buf, int buf_size, const char *filename)
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{
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const struct parallels_header *ph = (const void *)buf;
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if (buf_size < HEADER_SIZE)
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return 0;
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if ((!memcmp(ph->magic, HEADER_MAGIC, 16) ||
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!memcmp(ph->magic, HEADER_MAGIC2, 16)) &&
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(le32_to_cpu(ph->version) == HEADER_VERSION))
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return 100;
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return 0;
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}
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static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
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Error **errp)
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{
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BDRVParallelsState *s = bs->opaque;
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int i;
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struct parallels_header ph;
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int ret;
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bs->read_only = 1; // no write support yet
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ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
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if (ret < 0) {
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goto fail;
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}
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bs->total_sectors = le64_to_cpu(ph.nb_sectors);
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if (le32_to_cpu(ph.version) != HEADER_VERSION) {
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goto fail_format;
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}
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if (!memcmp(ph.magic, HEADER_MAGIC, 16)) {
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s->off_multiplier = 1;
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bs->total_sectors = 0xffffffff & bs->total_sectors;
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} else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) {
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s->off_multiplier = le32_to_cpu(ph.tracks);
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} else {
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goto fail_format;
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}
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s->tracks = le32_to_cpu(ph.tracks);
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if (s->tracks == 0) {
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error_setg(errp, "Invalid image: Zero sectors per track");
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ret = -EINVAL;
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goto fail;
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}
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if (s->tracks > INT32_MAX/513) {
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error_setg(errp, "Invalid image: Too big cluster");
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ret = -EFBIG;
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goto fail;
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}
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s->catalog_size = le32_to_cpu(ph.catalog_entries);
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if (s->catalog_size > INT_MAX / 4) {
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error_setg(errp, "Catalog too large");
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ret = -EFBIG;
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goto fail;
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}
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s->catalog_bitmap = g_try_malloc(s->catalog_size * 4);
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if (s->catalog_size && s->catalog_bitmap == NULL) {
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ret = -ENOMEM;
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goto fail;
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}
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ret = bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4);
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if (ret < 0) {
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goto fail;
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}
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for (i = 0; i < s->catalog_size; i++)
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le32_to_cpus(&s->catalog_bitmap[i]);
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qemu_co_mutex_init(&s->lock);
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return 0;
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fail_format:
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error_setg(errp, "Image not in Parallels format");
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ret = -EINVAL;
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fail:
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g_free(s->catalog_bitmap);
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return ret;
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}
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static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
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{
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BDRVParallelsState *s = bs->opaque;
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uint32_t index, offset;
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index = sector_num / s->tracks;
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offset = sector_num % s->tracks;
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/* not allocated */
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if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0))
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return -1;
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return
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((uint64_t)s->catalog_bitmap[index] * s->off_multiplier + offset) * 512;
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}
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static int parallels_read(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors)
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{
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while (nb_sectors > 0) {
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int64_t position = seek_to_sector(bs, sector_num);
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if (position >= 0) {
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if (bdrv_pread(bs->file, position, buf, 512) != 512)
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return -1;
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} else {
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memset(buf, 0, 512);
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}
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nb_sectors--;
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sector_num++;
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buf += 512;
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}
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return 0;
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}
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static coroutine_fn int parallels_co_read(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors)
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{
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int ret;
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BDRVParallelsState *s = bs->opaque;
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qemu_co_mutex_lock(&s->lock);
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ret = parallels_read(bs, sector_num, buf, nb_sectors);
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qemu_co_mutex_unlock(&s->lock);
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return ret;
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}
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static void parallels_close(BlockDriverState *bs)
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{
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BDRVParallelsState *s = bs->opaque;
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g_free(s->catalog_bitmap);
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}
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static BlockDriver bdrv_parallels = {
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.format_name = "parallels",
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.instance_size = sizeof(BDRVParallelsState),
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.bdrv_probe = parallels_probe,
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.bdrv_open = parallels_open,
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.bdrv_read = parallels_co_read,
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.bdrv_close = parallels_close,
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};
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static void bdrv_parallels_init(void)
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{
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bdrv_register(&bdrv_parallels);
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}
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block_init(bdrv_parallels_init);
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