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![Kevin Wolf](/assets/img/avatar_default.png)
Almost all functions that access bs->file already take the graph lock now. Add locking to the remaining users and finally annotate the struct field itself as protected by the graph lock. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-ID: <20231027155333.420094-25-kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
1486 lines
44 KiB
C
1486 lines
44 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 "qemu/error-report.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 "qemu/memalign.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 uint32_t host_cluster_index(BDRVParallelsState *s, int64_t off)
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{
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off -= s->data_start << BDRV_SECTOR_BITS;
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return off / s->cluster_size;
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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 void parallels_set_bat_entry(BDRVParallelsState *s,
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uint32_t index, uint32_t offset)
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{
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s->bat_bitmap[index] = cpu_to_le32(offset);
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bitmap_set(s->bat_dirty_bmap, bat_entry_off(index) / s->bat_dirty_block, 1);
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}
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static int mark_used(BlockDriverState *bs, unsigned long *bitmap,
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uint32_t bitmap_size, int64_t off, uint32_t count)
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{
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BDRVParallelsState *s = bs->opaque;
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uint32_t cluster_index = host_cluster_index(s, off);
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unsigned long next_used;
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if (cluster_index + count > bitmap_size) {
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return -E2BIG;
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}
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next_used = find_next_bit(bitmap, bitmap_size, cluster_index);
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if (next_used < cluster_index + count) {
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return -EBUSY;
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}
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bitmap_set(bitmap, cluster_index, count);
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return 0;
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}
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/*
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* Collect used bitmap. The image can contain errors, we should fill the
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* bitmap anyway, as much as we can. This information will be used for
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* error resolution.
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*/
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static int GRAPH_RDLOCK parallels_fill_used_bitmap(BlockDriverState *bs)
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{
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BDRVParallelsState *s = bs->opaque;
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int64_t payload_bytes;
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uint32_t i;
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int err = 0;
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payload_bytes = bdrv_getlength(bs->file->bs);
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if (payload_bytes < 0) {
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return payload_bytes;
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}
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payload_bytes -= s->data_start * BDRV_SECTOR_SIZE;
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if (payload_bytes < 0) {
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return -EINVAL;
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}
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s->used_bmap_size = DIV_ROUND_UP(payload_bytes, s->cluster_size);
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if (s->used_bmap_size == 0) {
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return 0;
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}
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s->used_bmap = bitmap_try_new(s->used_bmap_size);
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if (s->used_bmap == NULL) {
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return -ENOMEM;
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}
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for (i = 0; i < s->bat_size; i++) {
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int err2;
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int64_t host_off = bat2sect(s, i) << BDRV_SECTOR_BITS;
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if (host_off == 0) {
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continue;
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}
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err2 = mark_used(bs, s->used_bmap, s->used_bmap_size, host_off, 1);
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if (err2 < 0 && err == 0) {
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err = err2;
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}
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}
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return err;
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}
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static void parallels_free_used_bitmap(BlockDriverState *bs)
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{
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BDRVParallelsState *s = bs->opaque;
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s->used_bmap_size = 0;
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g_free(s->used_bmap);
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}
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static int64_t coroutine_fn GRAPH_RDLOCK
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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 = 0;
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BDRVParallelsState *s = bs->opaque;
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int64_t i, pos, idx, to_allocate, first_free, host_off;
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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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/*
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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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*/
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assert(idx < s->bat_size && idx + to_allocate <= s->bat_size);
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first_free = find_first_zero_bit(s->used_bmap, s->used_bmap_size);
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if (first_free == s->used_bmap_size) {
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uint32_t new_usedsize;
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int64_t bytes = to_allocate * s->cluster_size;
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bytes += s->prealloc_size * BDRV_SECTOR_SIZE;
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host_off = s->data_end * BDRV_SECTOR_SIZE;
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/*
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* We require the expanded size to read back as zero. If the
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* user permitted truncation, we try that; but if it fails, we
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* force the safer-but-slower fallocate.
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*/
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if (s->prealloc_mode == PRL_PREALLOC_MODE_TRUNCATE) {
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ret = bdrv_co_truncate(bs->file, host_off + bytes,
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false, PREALLOC_MODE_OFF,
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BDRV_REQ_ZERO_WRITE, NULL);
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if (ret == -ENOTSUP) {
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s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
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}
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}
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if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
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ret = bdrv_co_pwrite_zeroes(bs->file, host_off, bytes, 0);
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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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new_usedsize = s->used_bmap_size + bytes / s->cluster_size;
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s->used_bmap = bitmap_zero_extend(s->used_bmap, s->used_bmap_size,
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new_usedsize);
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s->used_bmap_size = new_usedsize;
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} else {
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int64_t next_used;
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next_used = find_next_bit(s->used_bmap, s->used_bmap_size, first_free);
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/* Not enough continuous clusters in the middle, adjust the size */
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if (next_used - first_free < to_allocate) {
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to_allocate = next_used - first_free;
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*pnum = (idx + to_allocate) * s->tracks - sector_num;
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}
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host_off = s->data_start * BDRV_SECTOR_SIZE;
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host_off += first_free * s->cluster_size;
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/*
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* No need to preallocate if we are using tail area from the above
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* branch. In the other case we are likely re-using hole. Preallocate
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* the space if required by the prealloc_mode.
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*/
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if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE &&
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host_off < s->data_end * BDRV_SECTOR_SIZE) {
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ret = bdrv_co_pwrite_zeroes(bs->file, host_off,
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s->cluster_size * to_allocate, 0);
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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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}
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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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*/
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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_pwrite(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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ret = mark_used(bs, s->used_bmap, s->used_bmap_size, host_off, to_allocate);
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if (ret < 0) {
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/* Image consistency is broken. Alarm! */
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return ret;
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}
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for (i = 0; i < to_allocate; i++) {
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parallels_set_bat_entry(s, idx + i,
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host_off / BDRV_SECTOR_SIZE / s->off_multiplier);
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host_off += s->cluster_size;
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}
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if (host_off > s->data_end * BDRV_SECTOR_SIZE) {
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s->data_end = host_off / BDRV_SECTOR_SIZE;
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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 int coroutine_fn GRAPH_RDLOCK
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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_co_pwrite(bs->file, off, to_write,
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(uint8_t *)s->header + off, 0);
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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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|
|
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static int coroutine_fn GRAPH_RDLOCK
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parallels_co_block_status(BlockDriverState *bs, bool want_zero, int64_t offset,
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int64_t bytes, int64_t *pnum, 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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|
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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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|
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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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|
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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 int coroutine_fn GRAPH_RDLOCK
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parallels_co_writev(BlockDriverState *bs, 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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|
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qemu_iovec_init(&hd_qiov, qiov->niov);
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|
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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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|
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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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|
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nbytes = n << BDRV_SECTOR_BITS;
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|
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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,
|
|
&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 GRAPH_RDLOCK
|
|
parallels_co_readv(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
|
|
QEMUIOVector *qiov)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
uint64_t bytes_done = 0;
|
|
QEMUIOVector hd_qiov;
|
|
int ret = 0;
|
|
|
|
qemu_iovec_init(&hd_qiov, qiov->niov);
|
|
|
|
while (nb_sectors > 0) {
|
|
int64_t position;
|
|
int n, nbytes;
|
|
|
|
qemu_co_mutex_lock(&s->lock);
|
|
position = block_status(s, sector_num, nb_sectors, &n);
|
|
qemu_co_mutex_unlock(&s->lock);
|
|
|
|
nbytes = n << BDRV_SECTOR_BITS;
|
|
|
|
qemu_iovec_reset(&hd_qiov);
|
|
qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
|
|
|
|
if (position < 0) {
|
|
if (bs->backing) {
|
|
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 GRAPH_RDLOCK
|
|
parallels_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes)
|
|
{
|
|
int ret = 0;
|
|
uint32_t cluster, count;
|
|
BDRVParallelsState *s = bs->opaque;
|
|
|
|
/*
|
|
* The image does not support ZERO mark inside the BAT, which means that
|
|
* stale data could be exposed from the backing file.
|
|
*/
|
|
if (bs->backing) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (!QEMU_IS_ALIGNED(offset, s->cluster_size)) {
|
|
return -ENOTSUP;
|
|
} else if (!QEMU_IS_ALIGNED(bytes, s->cluster_size)) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
cluster = offset / s->cluster_size;
|
|
count = bytes / s->cluster_size;
|
|
|
|
qemu_co_mutex_lock(&s->lock);
|
|
for (; count > 0; cluster++, count--) {
|
|
int64_t host_off = bat2sect(s, cluster) << BDRV_SECTOR_BITS;
|
|
if (host_off == 0) {
|
|
continue;
|
|
}
|
|
|
|
ret = bdrv_co_pdiscard(bs->file, host_off, s->cluster_size);
|
|
if (ret < 0) {
|
|
goto done;
|
|
}
|
|
|
|
parallels_set_bat_entry(s, cluster, 0);
|
|
bitmap_clear(s->used_bmap, host_cluster_index(s, host_off), 1);
|
|
}
|
|
done:
|
|
qemu_co_mutex_unlock(&s->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int coroutine_fn GRAPH_RDLOCK
|
|
parallels_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
/*
|
|
* The zero flag is missed in the Parallels format specification. We can
|
|
* resort to discard if we have no backing file (this condition is checked
|
|
* inside parallels_co_pdiscard().
|
|
*/
|
|
return parallels_co_pdiscard(bs, offset, bytes);
|
|
}
|
|
|
|
|
|
static void parallels_check_unclean(BlockDriverState *bs,
|
|
BdrvCheckResult *res,
|
|
BdrvCheckMode fix)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
|
|
if (!s->header_unclean) {
|
|
return;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns true if data_off is correct, otherwise false. In both cases
|
|
* correct_offset is set to the proper value.
|
|
*/
|
|
static bool parallels_test_data_off(BDRVParallelsState *s,
|
|
int64_t file_nb_sectors,
|
|
uint32_t *correct_offset)
|
|
{
|
|
uint32_t data_off, min_off;
|
|
bool old_magic;
|
|
|
|
/*
|
|
* There are two slightly different image formats: with "WithoutFreeSpace"
|
|
* or "WithouFreSpacExt" magic words. Call the first one as "old magic".
|
|
* In such images data_off field can be zero. In this case the offset is
|
|
* calculated as the end of BAT table plus some padding to ensure sector
|
|
* size alignment.
|
|
*/
|
|
old_magic = !memcmp(s->header->magic, HEADER_MAGIC, 16);
|
|
|
|
min_off = DIV_ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE);
|
|
if (!old_magic) {
|
|
min_off = ROUND_UP(min_off, s->cluster_size / BDRV_SECTOR_SIZE);
|
|
}
|
|
|
|
if (correct_offset) {
|
|
*correct_offset = min_off;
|
|
}
|
|
|
|
data_off = le32_to_cpu(s->header->data_off);
|
|
if (data_off == 0 && old_magic) {
|
|
return true;
|
|
}
|
|
|
|
if (data_off < min_off || data_off > file_nb_sectors) {
|
|
return false;
|
|
}
|
|
|
|
if (correct_offset) {
|
|
*correct_offset = data_off;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int coroutine_fn GRAPH_RDLOCK
|
|
parallels_check_data_off(BlockDriverState *bs, BdrvCheckResult *res,
|
|
BdrvCheckMode fix)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
int64_t file_size;
|
|
uint32_t data_off;
|
|
|
|
file_size = bdrv_co_nb_sectors(bs->file->bs);
|
|
if (file_size < 0) {
|
|
res->check_errors++;
|
|
return file_size;
|
|
}
|
|
|
|
if (parallels_test_data_off(s, file_size, &data_off)) {
|
|
return 0;
|
|
}
|
|
|
|
res->corruptions++;
|
|
if (fix & BDRV_FIX_ERRORS) {
|
|
int err;
|
|
s->header->data_off = cpu_to_le32(data_off);
|
|
s->data_start = data_off;
|
|
|
|
parallels_free_used_bitmap(bs);
|
|
err = parallels_fill_used_bitmap(bs);
|
|
if (err == -ENOMEM) {
|
|
res->check_errors++;
|
|
return err;
|
|
}
|
|
|
|
res->corruptions_fixed++;
|
|
}
|
|
|
|
fprintf(stderr, "%s data_off field has incorrect value\n",
|
|
fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int coroutine_fn GRAPH_RDLOCK
|
|
parallels_check_outside_image(BlockDriverState *bs, BdrvCheckResult *res,
|
|
BdrvCheckMode fix)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
uint32_t i;
|
|
int64_t off, high_off, size;
|
|
|
|
size = bdrv_co_getlength(bs->file->bs);
|
|
if (size < 0) {
|
|
res->check_errors++;
|
|
return size;
|
|
}
|
|
|
|
high_off = 0;
|
|
for (i = 0; i < s->bat_size; i++) {
|
|
off = bat2sect(s, i) << BDRV_SECTOR_BITS;
|
|
if (off + s->cluster_size > size) {
|
|
fprintf(stderr, "%s cluster %u is outside image\n",
|
|
fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
|
|
res->corruptions++;
|
|
if (fix & BDRV_FIX_ERRORS) {
|
|
parallels_set_bat_entry(s, i, 0);
|
|
res->corruptions_fixed++;
|
|
}
|
|
continue;
|
|
}
|
|
if (high_off < off) {
|
|
high_off = off;
|
|
}
|
|
}
|
|
|
|
if (high_off == 0) {
|
|
res->image_end_offset = s->data_end << BDRV_SECTOR_BITS;
|
|
} else {
|
|
res->image_end_offset = high_off + s->cluster_size;
|
|
s->data_end = res->image_end_offset >> BDRV_SECTOR_BITS;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int coroutine_fn GRAPH_RDLOCK
|
|
parallels_check_leak(BlockDriverState *bs, BdrvCheckResult *res,
|
|
BdrvCheckMode fix, bool explicit)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
int64_t size;
|
|
int ret;
|
|
|
|
size = bdrv_co_getlength(bs->file->bs);
|
|
if (size < 0) {
|
|
res->check_errors++;
|
|
return size;
|
|
}
|
|
|
|
if (size > res->image_end_offset) {
|
|
int64_t count;
|
|
count = DIV_ROUND_UP(size - res->image_end_offset, s->cluster_size);
|
|
if (explicit) {
|
|
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_co_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++;
|
|
return ret;
|
|
}
|
|
if (explicit) {
|
|
res->leaks_fixed += count;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int coroutine_fn GRAPH_RDLOCK
|
|
parallels_check_duplicate(BlockDriverState *bs, BdrvCheckResult *res,
|
|
BdrvCheckMode fix)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
int64_t host_off, host_sector, guest_sector;
|
|
unsigned long *bitmap;
|
|
uint32_t i, bitmap_size, bat_entry;
|
|
int n, ret = 0;
|
|
uint64_t *buf = NULL;
|
|
bool fixed = false;
|
|
|
|
/*
|
|
* Create a bitmap of used clusters.
|
|
* If a bit is set, there is a BAT entry pointing to this cluster.
|
|
* Loop through the BAT entries, check bits relevant to an entry offset.
|
|
* If bit is set, this entry is duplicated. Otherwise set the bit.
|
|
*
|
|
* We shouldn't worry about newly allocated clusters outside the image
|
|
* because they are created higher then any existing cluster pointed by
|
|
* a BAT entry.
|
|
*/
|
|
bitmap_size = host_cluster_index(s, res->image_end_offset);
|
|
if (bitmap_size == 0) {
|
|
return 0;
|
|
}
|
|
if (res->image_end_offset % s->cluster_size) {
|
|
/* A not aligned image end leads to a bitmap shorter by 1 */
|
|
bitmap_size++;
|
|
}
|
|
|
|
bitmap = bitmap_new(bitmap_size);
|
|
|
|
buf = qemu_blockalign(bs, s->cluster_size);
|
|
|
|
for (i = 0; i < s->bat_size; i++) {
|
|
host_off = bat2sect(s, i) << BDRV_SECTOR_BITS;
|
|
if (host_off == 0) {
|
|
continue;
|
|
}
|
|
|
|
ret = mark_used(bs, bitmap, bitmap_size, host_off, 1);
|
|
assert(ret != -E2BIG);
|
|
if (ret == 0) {
|
|
continue;
|
|
}
|
|
|
|
/* this cluster duplicates another one */
|
|
fprintf(stderr, "%s duplicate offset in BAT entry %u\n",
|
|
fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
|
|
|
|
res->corruptions++;
|
|
|
|
if (!(fix & BDRV_FIX_ERRORS)) {
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Reset the entry and allocate a new cluster
|
|
* for the relevant guest offset. In this way we let
|
|
* the lower layer to place the new cluster properly.
|
|
* Copy the original cluster to the allocated one.
|
|
* But before save the old offset value for repairing
|
|
* if we have an error.
|
|
*/
|
|
bat_entry = s->bat_bitmap[i];
|
|
parallels_set_bat_entry(s, i, 0);
|
|
|
|
ret = bdrv_co_pread(bs->file, host_off, s->cluster_size, buf, 0);
|
|
if (ret < 0) {
|
|
res->check_errors++;
|
|
goto out_repair_bat;
|
|
}
|
|
|
|
guest_sector = (i * (int64_t)s->cluster_size) >> BDRV_SECTOR_BITS;
|
|
host_sector = allocate_clusters(bs, guest_sector, s->tracks, &n);
|
|
if (host_sector < 0) {
|
|
res->check_errors++;
|
|
goto out_repair_bat;
|
|
}
|
|
host_off = host_sector << BDRV_SECTOR_BITS;
|
|
|
|
ret = bdrv_co_pwrite(bs->file, host_off, s->cluster_size, buf, 0);
|
|
if (ret < 0) {
|
|
res->check_errors++;
|
|
goto out_repair_bat;
|
|
}
|
|
|
|
if (host_off + s->cluster_size > res->image_end_offset) {
|
|
res->image_end_offset = host_off + s->cluster_size;
|
|
}
|
|
|
|
/*
|
|
* In the future allocate_cluster() will reuse holed offsets
|
|
* inside the image. Keep the used clusters bitmap content
|
|
* consistent for the new allocated clusters too.
|
|
*
|
|
* Note, clusters allocated outside the current image are not
|
|
* considered, and the bitmap size doesn't change. This specifically
|
|
* means that -E2BIG is OK.
|
|
*/
|
|
ret = mark_used(bs, bitmap, bitmap_size, host_off, 1);
|
|
if (ret == -EBUSY) {
|
|
res->check_errors++;
|
|
goto out_repair_bat;
|
|
}
|
|
|
|
fixed = true;
|
|
res->corruptions_fixed++;
|
|
|
|
}
|
|
|
|
if (fixed) {
|
|
/*
|
|
* When new clusters are allocated, the file size increases by
|
|
* 128 Mb. We need to truncate the file to the right size. Let
|
|
* the leak fix code make its job without res changing.
|
|
*/
|
|
ret = parallels_check_leak(bs, res, fix, false);
|
|
}
|
|
|
|
out_free:
|
|
g_free(buf);
|
|
g_free(bitmap);
|
|
return ret;
|
|
/*
|
|
* We can get here only from places where index and old_offset have
|
|
* meaningful values.
|
|
*/
|
|
out_repair_bat:
|
|
s->bat_bitmap[i] = bat_entry;
|
|
goto out_free;
|
|
}
|
|
|
|
static void parallels_collect_statistics(BlockDriverState *bs,
|
|
BdrvCheckResult *res,
|
|
BdrvCheckMode fix)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
int64_t off, prev_off;
|
|
uint32_t i;
|
|
|
|
res->bfi.total_clusters = s->bat_size;
|
|
res->bfi.compressed_clusters = 0; /* compression is not supported */
|
|
|
|
prev_off = 0;
|
|
for (i = 0; i < s->bat_size; i++) {
|
|
off = bat2sect(s, i) << BDRV_SECTOR_BITS;
|
|
/*
|
|
* If BDRV_FIX_ERRORS is not set, out-of-image BAT entries were not
|
|
* fixed. Skip not allocated and out-of-image BAT entries.
|
|
*/
|
|
if (off == 0 || off + s->cluster_size > res->image_end_offset) {
|
|
prev_off = 0;
|
|
continue;
|
|
}
|
|
|
|
if (prev_off != 0 && (prev_off + s->cluster_size) != off) {
|
|
res->bfi.fragmented_clusters++;
|
|
}
|
|
prev_off = off;
|
|
res->bfi.allocated_clusters++;
|
|
}
|
|
}
|
|
|
|
static int coroutine_fn GRAPH_RDLOCK
|
|
parallels_co_check(BlockDriverState *bs, BdrvCheckResult *res,
|
|
BdrvCheckMode fix)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
int ret;
|
|
|
|
WITH_QEMU_LOCK_GUARD(&s->lock) {
|
|
parallels_check_unclean(bs, res, fix);
|
|
|
|
ret = parallels_check_data_off(bs, res, fix);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = parallels_check_outside_image(bs, res, fix);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = parallels_check_leak(bs, res, fix, true);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = parallels_check_duplicate(bs, res, fix);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
parallels_collect_statistics(bs, res, fix);
|
|
}
|
|
|
|
ret = bdrv_co_flush(bs);
|
|
if (ret < 0) {
|
|
res->check_errors++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int coroutine_fn GRAPH_UNLOCKED
|
|
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_co_open_blockdev_ref(parallels_opts->file, errp);
|
|
if (bs == NULL) {
|
|
return -EIO;
|
|
}
|
|
|
|
blk = blk_co_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_co_pwrite(blk, 0, BDRV_SECTOR_SIZE, tmp, 0);
|
|
if (ret < 0) {
|
|
goto exit;
|
|
}
|
|
ret = blk_co_pwrite_zeroes(blk, BDRV_SECTOR_SIZE,
|
|
(bat_sectors - 1) << BDRV_SECTOR_BITS, 0);
|
|
if (ret < 0) {
|
|
goto exit;
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
blk_co_unref(blk);
|
|
bdrv_co_unref(bs);
|
|
return ret;
|
|
|
|
exit:
|
|
error_setg_errno(errp, -ret, "Failed to create Parallels image");
|
|
goto out;
|
|
}
|
|
|
|
static int coroutine_fn GRAPH_UNLOCKED
|
|
parallels_co_create_opts(BlockDriver *drv, const char *filename,
|
|
QemuOpts *opts, Error **errp)
|
|
{
|
|
BlockdevCreateOptions *create_options = 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_co_create_file(filename, opts, errp);
|
|
if (ret < 0) {
|
|
goto done;
|
|
}
|
|
|
|
bs = bdrv_co_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, errp);
|
|
visit_free(v);
|
|
if (!create_options) {
|
|
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_co_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 GRAPH_RDLOCK 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, size, s->header, 0);
|
|
}
|
|
|
|
|
|
static int parallels_opts_prealloc(BlockDriverState *bs, QDict *options,
|
|
Error **errp)
|
|
{
|
|
int err;
|
|
char *buf;
|
|
int64_t bytes;
|
|
BDRVParallelsState *s = bs->opaque;
|
|
Error *local_err = NULL;
|
|
QemuOpts *opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, errp);
|
|
if (!opts) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
err = -EINVAL;
|
|
if (!qemu_opts_absorb_qdict(opts, options, errp)) {
|
|
goto done;
|
|
}
|
|
|
|
bytes = qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0);
|
|
s->prealloc_size = bytes >> BDRV_SECTOR_BITS;
|
|
buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE);
|
|
/* prealloc_mode can be downgraded later during allocate_clusters */
|
|
s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf,
|
|
PRL_PREALLOC_MODE_FALLOCATE,
|
|
&local_err);
|
|
g_free(buf);
|
|
if (local_err != NULL) {
|
|
error_propagate(errp, local_err);
|
|
goto done;
|
|
}
|
|
err = 0;
|
|
|
|
done:
|
|
qemu_opts_del(opts);
|
|
return err;
|
|
}
|
|
|
|
static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
ParallelsHeader ph;
|
|
int ret, size, i;
|
|
int64_t file_nb_sectors, sector;
|
|
uint32_t data_start;
|
|
bool need_check = false;
|
|
|
|
ret = parallels_opts_prealloc(bs, options, errp);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
GRAPH_RDLOCK_GUARD_MAINLOOP();
|
|
|
|
file_nb_sectors = bdrv_nb_sectors(bs->file->bs);
|
|
if (file_nb_sectors < 0) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = bdrv_pread(bs->file, 0, sizeof(ph), &ph, 0);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
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");
|
|
return -EINVAL;
|
|
}
|
|
if (s->tracks > INT32_MAX/513) {
|
|
error_setg(errp, "Invalid image: Too big cluster");
|
|
return -EFBIG;
|
|
}
|
|
s->prealloc_size = MAX(s->tracks, s->prealloc_size);
|
|
s->cluster_size = s->tracks << BDRV_SECTOR_BITS;
|
|
|
|
s->bat_size = le32_to_cpu(ph.bat_entries);
|
|
if (s->bat_size > INT_MAX / sizeof(uint32_t)) {
|
|
error_setg(errp, "Catalog too large");
|
|
return -EFBIG;
|
|
}
|
|
|
|
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) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = bdrv_pread(bs->file, 0, s->header_size, s->header, 0);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
s->bat_bitmap = (uint32_t *)(s->header + 1);
|
|
|
|
if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
|
|
need_check = s->header_unclean = true;
|
|
}
|
|
|
|
{
|
|
bool ok = parallels_test_data_off(s, file_nb_sectors, &data_start);
|
|
need_check = need_check || !ok;
|
|
}
|
|
|
|
s->data_start = data_start;
|
|
s->data_end = s->data_start;
|
|
if (s->data_end < (s->header_size >> BDRV_SECTOR_BITS)) {
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
if (ph.ext_off) {
|
|
if (flags & BDRV_O_RDWR) {
|
|
/*
|
|
* It's unsafe to open image RW if there is an extension (as we
|
|
* don't support it). But parallels driver in QEMU historically
|
|
* ignores the extension, so print warning and don't care.
|
|
*/
|
|
warn_report("Format Extension ignored in RW mode");
|
|
} else {
|
|
ret = parallels_read_format_extension(
|
|
bs, le64_to_cpu(ph.ext_off) << BDRV_SECTOR_BITS, errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
|
|
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_activate 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_normal(&s->migration_blocker, errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
qemu_co_mutex_init(&s->lock);
|
|
|
|
for (i = 0; i < s->bat_size; i++) {
|
|
sector = bat2sect(s, i);
|
|
if (sector + s->tracks > s->data_end) {
|
|
s->data_end = sector + s->tracks;
|
|
}
|
|
}
|
|
need_check = need_check || s->data_end > file_nb_sectors;
|
|
|
|
if (!need_check) {
|
|
ret = parallels_fill_used_bitmap(bs);
|
|
if (ret == -ENOMEM) {
|
|
goto fail;
|
|
}
|
|
need_check = need_check || ret < 0; /* These are correctable errors */
|
|
}
|
|
|
|
/*
|
|
* We don't repair the image here if it's opened for checks. Also we don't
|
|
* want to change inactive images and can't change readonly images.
|
|
*/
|
|
if ((flags & (BDRV_O_CHECK | BDRV_O_INACTIVE)) || !(flags & BDRV_O_RDWR)) {
|
|
return 0;
|
|
}
|
|
|
|
/* Repair the image if corruption was detected. */
|
|
if (need_check) {
|
|
BdrvCheckResult res;
|
|
ret = bdrv_check(bs, &res, BDRV_FIX_ERRORS | BDRV_FIX_LEAKS);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "Could not repair corrupted image");
|
|
migrate_del_blocker(&s->migration_blocker);
|
|
goto fail;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
fail_format:
|
|
error_setg(errp, "Image not in Parallels format");
|
|
return -EINVAL;
|
|
|
|
fail:
|
|
/*
|
|
* "s" object was allocated by g_malloc0 so we can safely
|
|
* try to free its fields even they were not allocated.
|
|
*/
|
|
parallels_free_used_bitmap(bs);
|
|
|
|
g_free(s->bat_dirty_bmap);
|
|
qemu_vfree(s->header);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static void parallels_close(BlockDriverState *bs)
|
|
{
|
|
BDRVParallelsState *s = bs->opaque;
|
|
|
|
GRAPH_RDLOCK_GUARD_MAINLOOP();
|
|
|
|
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);
|
|
}
|
|
|
|
parallels_free_used_bitmap(bs);
|
|
|
|
g_free(s->bat_dirty_bmap);
|
|
qemu_vfree(s->header);
|
|
|
|
migrate_del_blocker(&s->migration_blocker);
|
|
}
|
|
|
|
static bool parallels_is_support_dirty_bitmaps(BlockDriverState *bs)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static BlockDriver bdrv_parallels = {
|
|
.format_name = "parallels",
|
|
.instance_size = sizeof(BDRVParallelsState),
|
|
.create_opts = ¶llels_create_opts,
|
|
.is_format = true,
|
|
.supports_backing = true,
|
|
|
|
.bdrv_has_zero_init = bdrv_has_zero_init_1,
|
|
.bdrv_supports_persistent_dirty_bitmap = parallels_is_support_dirty_bitmaps,
|
|
|
|
.bdrv_probe = parallels_probe,
|
|
.bdrv_open = parallels_open,
|
|
.bdrv_close = parallels_close,
|
|
.bdrv_child_perm = bdrv_default_perms,
|
|
.bdrv_co_block_status = parallels_co_block_status,
|
|
.bdrv_co_flush_to_os = parallels_co_flush_to_os,
|
|
.bdrv_co_readv = parallels_co_readv,
|
|
.bdrv_co_writev = parallels_co_writev,
|
|
.bdrv_co_create = parallels_co_create,
|
|
.bdrv_co_create_opts = parallels_co_create_opts,
|
|
.bdrv_co_check = parallels_co_check,
|
|
.bdrv_co_pdiscard = parallels_co_pdiscard,
|
|
.bdrv_co_pwrite_zeroes = parallels_co_pwrite_zeroes,
|
|
};
|
|
|
|
static void bdrv_parallels_init(void)
|
|
{
|
|
bdrv_register(&bdrv_parallels);
|
|
}
|
|
|
|
block_init(bdrv_parallels_init);
|