There are several callers that need to create a new block backend from an existing BDS; make the task slightly easier with a common helper routine. Suggested-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20200424190903.522087-2-eblake@redhat.com> [mreitz: Set @ret only in error paths, see https://lists.nongnu.org/archive/html/qemu-block/2020-04/msg01216.html] Signed-off-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200428192648.749066-2-eblake@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
927 lines
28 KiB
C
927 lines
28 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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* Copyright (c) 2015 Denis V. Lunev <den@openvz.org>
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*
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* This code was originally based on comparing different disk images created
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* by Parallels. Currently it is based on opened OpenVZ sources
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* available at
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* http://git.openvz.org/?p=ploop;a=summary
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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/osdep.h"
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#include "qapi/error.h"
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#include "block/block_int.h"
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#include "block/qdict.h"
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#include "sysemu/block-backend.h"
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#include "qemu/module.h"
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#include "qemu/option.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qobject-input-visitor.h"
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#include "qapi/qapi-visit-block-core.h"
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#include "qemu/bswap.h"
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#include "qemu/bitmap.h"
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#include "migration/blocker.h"
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#include "parallels.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_INUSE_MAGIC (0x746F6E59)
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#define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32)
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static QEnumLookup prealloc_mode_lookup = {
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.array = (const char *const[]) {
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"falloc",
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"truncate",
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},
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.size = PRL_PREALLOC_MODE__MAX
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};
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#define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode"
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#define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size"
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static QemuOptsList parallels_runtime_opts = {
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.name = "parallels",
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.head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head),
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.desc = {
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{
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.name = PARALLELS_OPT_PREALLOC_SIZE,
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.type = QEMU_OPT_SIZE,
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.help = "Preallocation size on image expansion",
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.def_value_str = "128M",
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},
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{
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.name = PARALLELS_OPT_PREALLOC_MODE,
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.type = QEMU_OPT_STRING,
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.help = "Preallocation mode on image expansion "
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"(allowed values: falloc, truncate)",
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.def_value_str = "falloc",
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},
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{ /* end of list */ },
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},
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};
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static QemuOptsList parallels_create_opts = {
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.name = "parallels-create-opts",
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.head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
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.desc = {
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{
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.name = BLOCK_OPT_SIZE,
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.type = QEMU_OPT_SIZE,
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.help = "Virtual disk size",
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},
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{
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.name = BLOCK_OPT_CLUSTER_SIZE,
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.type = QEMU_OPT_SIZE,
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.help = "Parallels image cluster size",
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.def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
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},
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{ /* end of list */ }
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}
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};
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static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
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{
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return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier;
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}
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static uint32_t bat_entry_off(uint32_t idx)
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{
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return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx;
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}
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static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num)
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{
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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->bat_size) || (s->bat_bitmap[index] == 0)) {
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return -1;
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}
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return bat2sect(s, index) + offset;
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}
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static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
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int nb_sectors)
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{
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int ret = s->tracks - sector_num % s->tracks;
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return MIN(nb_sectors, ret);
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}
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static int64_t block_status(BDRVParallelsState *s, int64_t sector_num,
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int nb_sectors, int *pnum)
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{
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int64_t start_off = -2, prev_end_off = -2;
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*pnum = 0;
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while (nb_sectors > 0 || start_off == -2) {
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int64_t offset = seek_to_sector(s, sector_num);
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int to_end;
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if (start_off == -2) {
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start_off = offset;
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prev_end_off = offset;
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} else if (offset != prev_end_off) {
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break;
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}
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to_end = cluster_remainder(s, sector_num, nb_sectors);
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nb_sectors -= to_end;
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sector_num += to_end;
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*pnum += to_end;
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if (offset > 0) {
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prev_end_off += to_end;
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}
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}
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return start_off;
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}
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static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, int *pnum)
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{
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int ret;
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BDRVParallelsState *s = bs->opaque;
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int64_t pos, space, idx, to_allocate, i, len;
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pos = block_status(s, sector_num, nb_sectors, pnum);
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if (pos > 0) {
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return pos;
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}
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idx = sector_num / s->tracks;
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to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx;
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/* This function is called only by parallels_co_writev(), which will never
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* pass a sector_num at or beyond the end of the image (because the block
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* layer never passes such a sector_num to that function). Therefore, idx
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* is always below s->bat_size.
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* block_status() will limit *pnum so that sector_num + *pnum will not
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* exceed the image end. Therefore, idx + to_allocate cannot exceed
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* s->bat_size.
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* Note that s->bat_size is an unsigned int, therefore idx + to_allocate
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* will always fit into a uint32_t. */
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assert(idx < s->bat_size && idx + to_allocate <= s->bat_size);
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space = to_allocate * s->tracks;
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len = bdrv_getlength(bs->file->bs);
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if (len < 0) {
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return len;
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}
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if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) {
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space += s->prealloc_size;
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if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
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ret = bdrv_pwrite_zeroes(bs->file,
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s->data_end << BDRV_SECTOR_BITS,
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space << BDRV_SECTOR_BITS, 0);
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} else {
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ret = bdrv_truncate(bs->file,
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(s->data_end + space) << BDRV_SECTOR_BITS,
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false, PREALLOC_MODE_OFF, 0, NULL);
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}
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if (ret < 0) {
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return ret;
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}
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}
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/* Try to read from backing to fill empty clusters
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* FIXME: 1. previous write_zeroes may be redundant
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* 2. most of data we read from backing will be rewritten by
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* parallels_co_writev. On aligned-to-cluster write we do not need
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* this read at all.
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* 3. it would be good to combine write of data from backing and new
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* data into one write call */
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if (bs->backing) {
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int64_t nb_cow_sectors = to_allocate * s->tracks;
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int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS;
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void *buf = qemu_blockalign(bs, nb_cow_bytes);
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ret = bdrv_co_pread(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE,
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nb_cow_bytes, buf, 0);
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if (ret < 0) {
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qemu_vfree(buf);
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return ret;
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}
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ret = bdrv_co_pwritev(bs->file, s->data_end * BDRV_SECTOR_SIZE,
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nb_cow_bytes, buf, 0);
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qemu_vfree(buf);
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if (ret < 0) {
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return ret;
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}
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}
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for (i = 0; i < to_allocate; i++) {
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s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier);
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s->data_end += s->tracks;
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bitmap_set(s->bat_dirty_bmap,
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bat_entry_off(idx + i) / s->bat_dirty_block, 1);
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}
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return bat2sect(s, idx) + sector_num % s->tracks;
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}
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static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
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{
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BDRVParallelsState *s = bs->opaque;
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unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block);
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unsigned long bit;
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qemu_co_mutex_lock(&s->lock);
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bit = find_first_bit(s->bat_dirty_bmap, size);
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while (bit < size) {
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uint32_t off = bit * s->bat_dirty_block;
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uint32_t to_write = s->bat_dirty_block;
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int ret;
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if (off + to_write > s->header_size) {
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to_write = s->header_size - off;
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}
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ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off,
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to_write);
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if (ret < 0) {
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qemu_co_mutex_unlock(&s->lock);
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return ret;
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}
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bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1);
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}
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bitmap_zero(s->bat_dirty_bmap, size);
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qemu_co_mutex_unlock(&s->lock);
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return 0;
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}
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static int coroutine_fn parallels_co_block_status(BlockDriverState *bs,
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bool want_zero,
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int64_t offset,
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int64_t bytes,
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int64_t *pnum,
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int64_t *map,
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BlockDriverState **file)
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{
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BDRVParallelsState *s = bs->opaque;
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int count;
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assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
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qemu_co_mutex_lock(&s->lock);
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offset = block_status(s, offset >> BDRV_SECTOR_BITS,
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bytes >> BDRV_SECTOR_BITS, &count);
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qemu_co_mutex_unlock(&s->lock);
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*pnum = count * BDRV_SECTOR_SIZE;
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if (offset < 0) {
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return 0;
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}
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*map = offset * BDRV_SECTOR_SIZE;
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*file = bs->file->bs;
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return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
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}
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static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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QEMUIOVector *qiov, int flags)
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{
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BDRVParallelsState *s = bs->opaque;
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uint64_t bytes_done = 0;
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QEMUIOVector hd_qiov;
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int ret = 0;
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assert(!flags);
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qemu_iovec_init(&hd_qiov, qiov->niov);
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while (nb_sectors > 0) {
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int64_t position;
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int n, nbytes;
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qemu_co_mutex_lock(&s->lock);
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position = allocate_clusters(bs, sector_num, nb_sectors, &n);
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qemu_co_mutex_unlock(&s->lock);
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if (position < 0) {
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ret = (int)position;
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break;
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}
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nbytes = n << BDRV_SECTOR_BITS;
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qemu_iovec_reset(&hd_qiov);
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qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
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ret = bdrv_co_pwritev(bs->file, position * BDRV_SECTOR_SIZE, nbytes,
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&hd_qiov, 0);
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if (ret < 0) {
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break;
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}
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nb_sectors -= n;
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sector_num += n;
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bytes_done += nbytes;
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}
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|
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qemu_iovec_destroy(&hd_qiov);
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return ret;
|
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}
|
|
|
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static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
|
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
|
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{
|
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BDRVParallelsState *s = bs->opaque;
|
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uint64_t bytes_done = 0;
|
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QEMUIOVector hd_qiov;
|
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int ret = 0;
|
|
|
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qemu_iovec_init(&hd_qiov, qiov->niov);
|
|
|
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while (nb_sectors > 0) {
|
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int64_t position;
|
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int n, nbytes;
|
|
|
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qemu_co_mutex_lock(&s->lock);
|
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position = block_status(s, sector_num, nb_sectors, &n);
|
|
qemu_co_mutex_unlock(&s->lock);
|
|
|
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nbytes = n << BDRV_SECTOR_BITS;
|
|
|
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qemu_iovec_reset(&hd_qiov);
|
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qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
|
|
|
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if (position < 0) {
|
|
if (bs->backing) {
|
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ret = bdrv_co_preadv(bs->backing, sector_num * BDRV_SECTOR_SIZE,
|
|
nbytes, &hd_qiov, 0);
|
|
if (ret < 0) {
|
|
break;
|
|
}
|
|
} else {
|
|
qemu_iovec_memset(&hd_qiov, 0, 0, nbytes);
|
|
}
|
|
} else {
|
|
ret = bdrv_co_preadv(bs->file, position * BDRV_SECTOR_SIZE, nbytes,
|
|
&hd_qiov, 0);
|
|
if (ret < 0) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
nb_sectors -= n;
|
|
sector_num += n;
|
|
bytes_done += nbytes;
|
|
}
|
|
|
|
qemu_iovec_destroy(&hd_qiov);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int coroutine_fn parallels_co_check(BlockDriverState *bs,
|
|
BdrvCheckResult *res,
|
|
BdrvCheckMode fix)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
int64_t size, prev_off, high_off;
|
|
int ret;
|
|
uint32_t i;
|
|
bool flush_bat = false;
|
|
int cluster_size = s->tracks << BDRV_SECTOR_BITS;
|
|
|
|
size = bdrv_getlength(bs->file->bs);
|
|
if (size < 0) {
|
|
res->check_errors++;
|
|
return size;
|
|
}
|
|
|
|
qemu_co_mutex_lock(&s->lock);
|
|
if (s->header_unclean) {
|
|
fprintf(stderr, "%s image was not closed correctly\n",
|
|
fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
|
|
res->corruptions++;
|
|
if (fix & BDRV_FIX_ERRORS) {
|
|
/* parallels_close will do the job right */
|
|
res->corruptions_fixed++;
|
|
s->header_unclean = false;
|
|
}
|
|
}
|
|
|
|
res->bfi.total_clusters = s->bat_size;
|
|
res->bfi.compressed_clusters = 0; /* compression is not supported */
|
|
|
|
high_off = 0;
|
|
prev_off = 0;
|
|
for (i = 0; i < s->bat_size; i++) {
|
|
int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS;
|
|
if (off == 0) {
|
|
prev_off = 0;
|
|
continue;
|
|
}
|
|
|
|
/* cluster outside the image */
|
|
if (off > size) {
|
|
fprintf(stderr, "%s cluster %u is outside image\n",
|
|
fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
|
|
res->corruptions++;
|
|
if (fix & BDRV_FIX_ERRORS) {
|
|
prev_off = 0;
|
|
s->bat_bitmap[i] = 0;
|
|
res->corruptions_fixed++;
|
|
flush_bat = true;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
res->bfi.allocated_clusters++;
|
|
if (off > high_off) {
|
|
high_off = off;
|
|
}
|
|
|
|
if (prev_off != 0 && (prev_off + cluster_size) != off) {
|
|
res->bfi.fragmented_clusters++;
|
|
}
|
|
prev_off = off;
|
|
}
|
|
|
|
ret = 0;
|
|
if (flush_bat) {
|
|
ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size);
|
|
if (ret < 0) {
|
|
res->check_errors++;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
res->image_end_offset = high_off + cluster_size;
|
|
if (size > res->image_end_offset) {
|
|
int64_t count;
|
|
count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size);
|
|
fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
|
|
fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
|
|
size - res->image_end_offset);
|
|
res->leaks += count;
|
|
if (fix & BDRV_FIX_LEAKS) {
|
|
Error *local_err = NULL;
|
|
|
|
/*
|
|
* In order to really repair the image, we must shrink it.
|
|
* That means we have to pass exact=true.
|
|
*/
|
|
ret = bdrv_truncate(bs->file, res->image_end_offset, true,
|
|
PREALLOC_MODE_OFF, 0, &local_err);
|
|
if (ret < 0) {
|
|
error_report_err(local_err);
|
|
res->check_errors++;
|
|
goto out;
|
|
}
|
|
res->leaks_fixed += count;
|
|
}
|
|
}
|
|
|
|
out:
|
|
qemu_co_mutex_unlock(&s->lock);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts,
|
|
Error **errp)
|
|
{
|
|
BlockdevCreateOptionsParallels *parallels_opts;
|
|
BlockDriverState *bs;
|
|
BlockBackend *blk;
|
|
int64_t total_size, cl_size;
|
|
uint32_t bat_entries, bat_sectors;
|
|
ParallelsHeader header;
|
|
uint8_t tmp[BDRV_SECTOR_SIZE];
|
|
int ret;
|
|
|
|
assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS);
|
|
parallels_opts = &opts->u.parallels;
|
|
|
|
/* Sanity checks */
|
|
total_size = parallels_opts->size;
|
|
|
|
if (parallels_opts->has_cluster_size) {
|
|
cl_size = parallels_opts->cluster_size;
|
|
} else {
|
|
cl_size = DEFAULT_CLUSTER_SIZE;
|
|
}
|
|
|
|
/* XXX What is the real limit here? This is an insanely large maximum. */
|
|
if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) {
|
|
error_setg(errp, "Cluster size is too large");
|
|
return -EINVAL;
|
|
}
|
|
if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) {
|
|
error_setg(errp, "Image size is too large for this cluster size");
|
|
return -E2BIG;
|
|
}
|
|
|
|
if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) {
|
|
error_setg(errp, "Image size must be a multiple of 512 bytes");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) {
|
|
error_setg(errp, "Cluster size must be a multiple of 512 bytes");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Create BlockBackend to write to the image */
|
|
bs = bdrv_open_blockdev_ref(parallels_opts->file, errp);
|
|
if (bs == NULL) {
|
|
return -EIO;
|
|
}
|
|
|
|
blk = blk_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL,
|
|
errp);
|
|
if (!blk) {
|
|
ret = -EPERM;
|
|
goto out;
|
|
}
|
|
blk_set_allow_write_beyond_eof(blk, true);
|
|
|
|
/* Create image format */
|
|
bat_entries = DIV_ROUND_UP(total_size, cl_size);
|
|
bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size);
|
|
bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS;
|
|
|
|
memset(&header, 0, sizeof(header));
|
|
memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
|
|
header.version = cpu_to_le32(HEADER_VERSION);
|
|
/* don't care much about geometry, it is not used on image level */
|
|
header.heads = cpu_to_le32(HEADS_NUMBER);
|
|
header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE
|
|
/ HEADS_NUMBER / SEC_IN_CYL);
|
|
header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
|
|
header.bat_entries = cpu_to_le32(bat_entries);
|
|
header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
|
|
header.data_off = cpu_to_le32(bat_sectors);
|
|
|
|
/* write all the data */
|
|
memset(tmp, 0, sizeof(tmp));
|
|
memcpy(tmp, &header, sizeof(header));
|
|
|
|
ret = blk_pwrite(blk, 0, tmp, BDRV_SECTOR_SIZE, 0);
|
|
if (ret < 0) {
|
|
goto exit;
|
|
}
|
|
ret = blk_pwrite_zeroes(blk, BDRV_SECTOR_SIZE,
|
|
(bat_sectors - 1) << BDRV_SECTOR_BITS, 0);
|
|
if (ret < 0) {
|
|
goto exit;
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
blk_unref(blk);
|
|
bdrv_unref(bs);
|
|
return ret;
|
|
|
|
exit:
|
|
error_setg_errno(errp, -ret, "Failed to create Parallels image");
|
|
goto out;
|
|
}
|
|
|
|
static int coroutine_fn parallels_co_create_opts(BlockDriver *drv,
|
|
const char *filename,
|
|
QemuOpts *opts,
|
|
Error **errp)
|
|
{
|
|
BlockdevCreateOptions *create_options = NULL;
|
|
Error *local_err = NULL;
|
|
BlockDriverState *bs = NULL;
|
|
QDict *qdict;
|
|
Visitor *v;
|
|
int ret;
|
|
|
|
static const QDictRenames opt_renames[] = {
|
|
{ BLOCK_OPT_CLUSTER_SIZE, "cluster-size" },
|
|
{ NULL, NULL },
|
|
};
|
|
|
|
/* Parse options and convert legacy syntax */
|
|
qdict = qemu_opts_to_qdict_filtered(opts, NULL, ¶llels_create_opts,
|
|
true);
|
|
|
|
if (!qdict_rename_keys(qdict, opt_renames, errp)) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
/* Create and open the file (protocol layer) */
|
|
ret = bdrv_create_file(filename, opts, &local_err);
|
|
if (ret < 0) {
|
|
error_propagate(errp, local_err);
|
|
goto done;
|
|
}
|
|
|
|
bs = bdrv_open(filename, NULL, NULL,
|
|
BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
|
|
if (bs == NULL) {
|
|
ret = -EIO;
|
|
goto done;
|
|
}
|
|
|
|
/* Now get the QAPI type BlockdevCreateOptions */
|
|
qdict_put_str(qdict, "driver", "parallels");
|
|
qdict_put_str(qdict, "file", bs->node_name);
|
|
|
|
v = qobject_input_visitor_new_flat_confused(qdict, errp);
|
|
if (!v) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err);
|
|
visit_free(v);
|
|
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
/* Silently round up sizes */
|
|
create_options->u.parallels.size =
|
|
ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE);
|
|
create_options->u.parallels.cluster_size =
|
|
ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE);
|
|
|
|
/* Create the Parallels image (format layer) */
|
|
ret = parallels_co_create(create_options, errp);
|
|
if (ret < 0) {
|
|
goto done;
|
|
}
|
|
ret = 0;
|
|
|
|
done:
|
|
qobject_unref(qdict);
|
|
bdrv_unref(bs);
|
|
qapi_free_BlockdevCreateOptions(create_options);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int parallels_probe(const uint8_t *buf, int buf_size,
|
|
const char *filename)
|
|
{
|
|
const ParallelsHeader *ph = (const void *)buf;
|
|
|
|
if (buf_size < sizeof(ParallelsHeader)) {
|
|
return 0;
|
|
}
|
|
|
|
if ((!memcmp(ph->magic, HEADER_MAGIC, 16) ||
|
|
!memcmp(ph->magic, HEADER_MAGIC2, 16)) &&
|
|
(le32_to_cpu(ph->version) == HEADER_VERSION)) {
|
|
return 100;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parallels_update_header(BlockDriverState *bs)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs),
|
|
sizeof(ParallelsHeader));
|
|
|
|
if (size > s->header_size) {
|
|
size = s->header_size;
|
|
}
|
|
return bdrv_pwrite_sync(bs->file, 0, s->header, size);
|
|
}
|
|
|
|
static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
ParallelsHeader ph;
|
|
int ret, size, i;
|
|
QemuOpts *opts = NULL;
|
|
Error *local_err = NULL;
|
|
char *buf;
|
|
|
|
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
|
|
false, errp);
|
|
if (!bs->file) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
bs->total_sectors = le64_to_cpu(ph.nb_sectors);
|
|
|
|
if (le32_to_cpu(ph.version) != HEADER_VERSION) {
|
|
goto fail_format;
|
|
}
|
|
if (!memcmp(ph.magic, HEADER_MAGIC, 16)) {
|
|
s->off_multiplier = 1;
|
|
bs->total_sectors = 0xffffffff & bs->total_sectors;
|
|
} else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) {
|
|
s->off_multiplier = le32_to_cpu(ph.tracks);
|
|
} else {
|
|
goto fail_format;
|
|
}
|
|
|
|
s->tracks = le32_to_cpu(ph.tracks);
|
|
if (s->tracks == 0) {
|
|
error_setg(errp, "Invalid image: Zero sectors per track");
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
if (s->tracks > INT32_MAX/513) {
|
|
error_setg(errp, "Invalid image: Too big cluster");
|
|
ret = -EFBIG;
|
|
goto fail;
|
|
}
|
|
|
|
s->bat_size = le32_to_cpu(ph.bat_entries);
|
|
if (s->bat_size > INT_MAX / sizeof(uint32_t)) {
|
|
error_setg(errp, "Catalog too large");
|
|
ret = -EFBIG;
|
|
goto fail;
|
|
}
|
|
|
|
size = bat_entry_off(s->bat_size);
|
|
s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs));
|
|
s->header = qemu_try_blockalign(bs->file->bs, s->header_size);
|
|
if (s->header == NULL) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
s->data_end = le32_to_cpu(ph.data_off);
|
|
if (s->data_end == 0) {
|
|
s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE);
|
|
}
|
|
if (s->data_end < s->header_size) {
|
|
/* there is not enough unused space to fit to block align between BAT
|
|
and actual data. We can't avoid read-modify-write... */
|
|
s->header_size = size;
|
|
}
|
|
|
|
ret = bdrv_pread(bs->file, 0, s->header, s->header_size);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
s->bat_bitmap = (uint32_t *)(s->header + 1);
|
|
|
|
for (i = 0; i < s->bat_size; i++) {
|
|
int64_t off = bat2sect(s, i);
|
|
if (off >= s->data_end) {
|
|
s->data_end = off + s->tracks;
|
|
}
|
|
}
|
|
|
|
if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
|
|
/* Image was not closed correctly. The check is mandatory */
|
|
s->header_unclean = true;
|
|
if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) {
|
|
error_setg(errp, "parallels: Image was not closed correctly; "
|
|
"cannot be opened read/write");
|
|
ret = -EACCES;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err);
|
|
if (local_err != NULL) {
|
|
goto fail_options;
|
|
}
|
|
|
|
qemu_opts_absorb_qdict(opts, options, &local_err);
|
|
if (local_err != NULL) {
|
|
goto fail_options;
|
|
}
|
|
|
|
s->prealloc_size =
|
|
qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0);
|
|
s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS);
|
|
buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE);
|
|
s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf,
|
|
PRL_PREALLOC_MODE_FALLOCATE,
|
|
&local_err);
|
|
g_free(buf);
|
|
if (local_err != NULL) {
|
|
goto fail_options;
|
|
}
|
|
|
|
if (!bdrv_has_zero_init_truncate(bs->file->bs)) {
|
|
s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
|
|
}
|
|
|
|
if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) {
|
|
s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
|
|
ret = parallels_update_header(bs);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
s->bat_dirty_block = 4 * qemu_real_host_page_size;
|
|
s->bat_dirty_bmap =
|
|
bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block));
|
|
|
|
/* Disable migration until bdrv_invalidate_cache method is added */
|
|
error_setg(&s->migration_blocker, "The Parallels format used by node '%s' "
|
|
"does not support live migration",
|
|
bdrv_get_device_or_node_name(bs));
|
|
ret = migrate_add_blocker(s->migration_blocker, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
error_free(s->migration_blocker);
|
|
goto fail;
|
|
}
|
|
qemu_co_mutex_init(&s->lock);
|
|
return 0;
|
|
|
|
fail_format:
|
|
error_setg(errp, "Image not in Parallels format");
|
|
ret = -EINVAL;
|
|
fail:
|
|
qemu_vfree(s->header);
|
|
return ret;
|
|
|
|
fail_options:
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
|
|
static void parallels_close(BlockDriverState *bs)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
|
|
if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) {
|
|
s->header->inuse = 0;
|
|
parallels_update_header(bs);
|
|
|
|
/* errors are ignored, so we might as well pass exact=true */
|
|
bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, true,
|
|
PREALLOC_MODE_OFF, 0, NULL);
|
|
}
|
|
|
|
g_free(s->bat_dirty_bmap);
|
|
qemu_vfree(s->header);
|
|
|
|
migrate_del_blocker(s->migration_blocker);
|
|
error_free(s->migration_blocker);
|
|
}
|
|
|
|
static BlockDriver bdrv_parallels = {
|
|
.format_name = "parallels",
|
|
.instance_size = sizeof(BDRVParallelsState),
|
|
.bdrv_probe = parallels_probe,
|
|
.bdrv_open = parallels_open,
|
|
.bdrv_close = parallels_close,
|
|
.bdrv_child_perm = bdrv_format_default_perms,
|
|
.bdrv_co_block_status = parallels_co_block_status,
|
|
.bdrv_has_zero_init = bdrv_has_zero_init_1,
|
|
.bdrv_co_flush_to_os = parallels_co_flush_to_os,
|
|
.bdrv_co_readv = parallels_co_readv,
|
|
.bdrv_co_writev = parallels_co_writev,
|
|
.supports_backing = true,
|
|
.bdrv_co_create = parallels_co_create,
|
|
.bdrv_co_create_opts = parallels_co_create_opts,
|
|
.bdrv_co_check = parallels_co_check,
|
|
.create_opts = ¶llels_create_opts,
|
|
};
|
|
|
|
static void bdrv_parallels_init(void)
|
|
{
|
|
bdrv_register(&bdrv_parallels);
|
|
}
|
|
|
|
block_init(bdrv_parallels_init);
|