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3a691c50f1
blk_truncate() itself will pass that value to bdrv_truncate(), and all callers of blk_truncate() just set the parameter to PREALLOC_MODE_OFF for now. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20170613202107.10125-4-mreitz@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
798 lines
23 KiB
C
798 lines
23 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 "qemu-common.h"
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#include "block/block_int.h"
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#include "sysemu/block-backend.h"
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#include "qemu/module.h"
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#include "qemu/bswap.h"
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#include "qemu/bitmap.h"
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#include "qapi/util.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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#define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */
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// always little-endian
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typedef struct ParallelsHeader {
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char magic[16]; // "WithoutFreeSpace"
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uint32_t version;
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uint32_t heads;
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uint32_t cylinders;
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uint32_t tracks;
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uint32_t bat_entries;
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uint64_t nb_sectors;
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uint32_t inuse;
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uint32_t data_off;
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char padding[12];
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} QEMU_PACKED ParallelsHeader;
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typedef enum ParallelsPreallocMode {
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PRL_PREALLOC_MODE_FALLOCATE = 0,
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PRL_PREALLOC_MODE_TRUNCATE = 1,
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PRL_PREALLOC_MODE__MAX = 2,
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} ParallelsPreallocMode;
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static const char *prealloc_mode_lookup[] = {
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"falloc",
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"truncate",
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NULL,
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};
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typedef struct BDRVParallelsState {
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/** Locking is conservative, the lock protects
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* - image file extending (truncate, fallocate)
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* - any access to block allocation table
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*/
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CoMutex lock;
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ParallelsHeader *header;
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uint32_t header_size;
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bool header_unclean;
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unsigned long *bat_dirty_bmap;
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unsigned int bat_dirty_block;
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uint32_t *bat_bitmap;
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unsigned int bat_size;
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int64_t data_end;
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uint64_t prealloc_size;
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ParallelsPreallocMode prealloc_mode;
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unsigned int tracks;
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unsigned int off_multiplier;
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} BDRVParallelsState;
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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 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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BDRVParallelsState *s = bs->opaque;
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int64_t pos, space, idx, to_allocate, i;
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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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if (s->data_end + space > bdrv_getlength(bs->file->bs) >> BDRV_SECTOR_BITS) {
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int ret;
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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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PREALLOC_MODE_OFF, 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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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 int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
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{
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BDRVParallelsState *s = bs->opaque;
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int64_t offset;
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qemu_co_mutex_lock(&s->lock);
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offset = block_status(s, sector_num, nb_sectors, pnum);
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qemu_co_mutex_unlock(&s->lock);
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if (offset < 0) {
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return 0;
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}
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*file = bs->file->bs;
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return (offset << BDRV_SECTOR_BITS) |
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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, 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 = 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_writev(bs->file, position, n, &hd_qiov);
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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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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);
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qemu_co_mutex_unlock(&s->lock);
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nbytes = n << BDRV_SECTOR_BITS;
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if (position < 0) {
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qemu_iovec_memset(qiov, bytes_done, 0, nbytes);
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} else {
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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_readv(bs->file, position, n, &hd_qiov);
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if (ret < 0) {
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break;
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}
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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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qemu_iovec_destroy(&hd_qiov);
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return ret;
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}
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static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res,
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BdrvCheckMode fix)
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{
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BDRVParallelsState *s = bs->opaque;
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int64_t size, prev_off, high_off;
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int ret;
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uint32_t i;
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bool flush_bat = false;
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int cluster_size = s->tracks << BDRV_SECTOR_BITS;
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size = bdrv_getlength(bs->file->bs);
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if (size < 0) {
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res->check_errors++;
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return size;
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}
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if (s->header_unclean) {
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fprintf(stderr, "%s image was not closed correctly\n",
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fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
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res->corruptions++;
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if (fix & BDRV_FIX_ERRORS) {
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/* parallels_close will do the job right */
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res->corruptions_fixed++;
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s->header_unclean = false;
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}
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}
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res->bfi.total_clusters = s->bat_size;
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res->bfi.compressed_clusters = 0; /* compression is not supported */
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high_off = 0;
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prev_off = 0;
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for (i = 0; i < s->bat_size; i++) {
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int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS;
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if (off == 0) {
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prev_off = 0;
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continue;
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}
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/* cluster outside the image */
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if (off > size) {
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fprintf(stderr, "%s cluster %u is outside image\n",
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fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
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res->corruptions++;
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if (fix & BDRV_FIX_ERRORS) {
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prev_off = 0;
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s->bat_bitmap[i] = 0;
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res->corruptions_fixed++;
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flush_bat = true;
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continue;
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}
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}
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res->bfi.allocated_clusters++;
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if (off > high_off) {
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high_off = off;
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}
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if (prev_off != 0 && (prev_off + cluster_size) != off) {
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res->bfi.fragmented_clusters++;
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}
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prev_off = off;
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}
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if (flush_bat) {
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ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size);
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if (ret < 0) {
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res->check_errors++;
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return ret;
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}
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}
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res->image_end_offset = high_off + cluster_size;
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if (size > res->image_end_offset) {
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int64_t count;
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count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size);
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fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
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fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
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size - res->image_end_offset);
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res->leaks += count;
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if (fix & BDRV_FIX_LEAKS) {
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Error *local_err = NULL;
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ret = bdrv_truncate(bs->file, res->image_end_offset,
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PREALLOC_MODE_OFF, &local_err);
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if (ret < 0) {
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error_report_err(local_err);
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res->check_errors++;
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return ret;
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}
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res->leaks_fixed += count;
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}
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}
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return 0;
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}
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static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
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{
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int64_t total_size, cl_size;
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uint8_t tmp[BDRV_SECTOR_SIZE];
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Error *local_err = NULL;
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BlockBackend *file;
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uint32_t bat_entries, bat_sectors;
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ParallelsHeader header;
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int ret;
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total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
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BDRV_SECTOR_SIZE);
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cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
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DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE);
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if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) {
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error_propagate(errp, local_err);
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return -E2BIG;
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}
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ret = bdrv_create_file(filename, opts, &local_err);
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if (ret < 0) {
|
|
error_propagate(errp, local_err);
|
|
return ret;
|
|
}
|
|
|
|
file = blk_new_open(filename, NULL, NULL,
|
|
BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
|
|
&local_err);
|
|
if (file == NULL) {
|
|
error_propagate(errp, local_err);
|
|
return -EIO;
|
|
}
|
|
|
|
blk_set_allow_write_beyond_eof(file, true);
|
|
|
|
ret = blk_truncate(file, 0, PREALLOC_MODE_OFF, errp);
|
|
if (ret < 0) {
|
|
goto exit;
|
|
}
|
|
|
|
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(16);
|
|
header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32);
|
|
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(file, 0, tmp, BDRV_SECTOR_SIZE, 0);
|
|
if (ret < 0) {
|
|
goto exit;
|
|
}
|
|
ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE,
|
|
(bat_sectors - 1) << BDRV_SECTOR_BITS, 0);
|
|
if (ret < 0) {
|
|
goto exit;
|
|
}
|
|
ret = 0;
|
|
|
|
done:
|
|
blk_unref(file);
|
|
return ret;
|
|
|
|
exit:
|
|
error_setg_errno(errp, -ret, "Failed to create Parallels image");
|
|
goto done;
|
|
}
|
|
|
|
|
|
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__MAX, PRL_PREALLOC_MODE_FALLOCATE, &local_err);
|
|
g_free(buf);
|
|
if (local_err != NULL) {
|
|
goto fail_options;
|
|
}
|
|
|
|
if (!(flags & BDRV_O_RESIZE) || !bdrv_has_zero_init(bs->file->bs) ||
|
|
bdrv_truncate(bs->file, bdrv_getlength(bs->file->bs),
|
|
PREALLOC_MODE_OFF, NULL) != 0) {
|
|
s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
|
|
}
|
|
|
|
if (flags & BDRV_O_RDWR) {
|
|
s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
|
|
ret = parallels_update_header(bs);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
s->bat_dirty_block = 4 * getpagesize();
|
|
s->bat_dirty_bmap =
|
|
bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block));
|
|
|
|
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) {
|
|
s->header->inuse = 0;
|
|
parallels_update_header(bs);
|
|
}
|
|
|
|
if (bs->open_flags & BDRV_O_RDWR) {
|
|
bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS,
|
|
PREALLOC_MODE_OFF, NULL);
|
|
}
|
|
|
|
g_free(s->bat_dirty_bmap);
|
|
qemu_vfree(s->header);
|
|
}
|
|
|
|
static QemuOptsList parallels_create_opts = {
|
|
.name = "parallels-create-opts",
|
|
.head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "Virtual disk size",
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_CLUSTER_SIZE,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "Parallels image cluster size",
|
|
.def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
|
|
},
|
|
{ /* end of list */ }
|
|
}
|
|
};
|
|
|
|
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_get_block_status = parallels_co_get_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,
|
|
|
|
.bdrv_create = parallels_create,
|
|
.bdrv_check = parallels_check,
|
|
.create_opts = ¶llels_create_opts,
|
|
};
|
|
|
|
static void bdrv_parallels_init(void)
|
|
{
|
|
bdrv_register(&bdrv_parallels);
|
|
}
|
|
|
|
block_init(bdrv_parallels_init);
|