debian/patches/0004-introduce-new-vma-archive-format.patch

   1 From 5fbe9dc9bb921a1ee4814028d42c4fc46b04e172 Mon Sep 17 00:00:00 2001
   2 From: Dietmar Maurer <dietmar@proxmox.com>
   3 Date: Tue, 13 Nov 2012 11:11:38 +0100
   4 Subject: [PATCH v3 4/6] introduce new vma archive format
   5
   6 This is a very simple archive format, see docs/specs/vma_spec.txt
   7
   8 Signed-off-by: Dietmar Maurer <dietmar@proxmox.com>
   9 ---
  10  Makefile                |    3 +-
  11  Makefile.objs           |    2 +-
  12  blockdev.c              |    6 +-
  13  docs/specs/vma_spec.txt |   24 ++
  14  vma-reader.c            |  801 +++++++++++++++++++++++++++++++++++++++++
  15  vma-writer.c            |  920 +++++++++++++++++++++++++++++++++++++++++++++++
  16  vma.c                   |  558 ++++++++++++++++++++++++++++
  17  vma.h                   |  146 ++++++++
  18  8 files changed, 2456 insertions(+), 4 deletions(-)
  19  create mode 100644 docs/specs/vma_spec.txt
  20  create mode 100644 vma-reader.c
  21  create mode 100644 vma-writer.c
  22  create mode 100644 vma.c
  23  create mode 100644 vma.h
  24
  25 diff --git a/Makefile b/Makefile
  26 index 9ecbcbb..30a9268 100644
  27 --- a/Makefile
  28 +++ b/Makefile
  29 @@ -100,7 +100,7 @@ defconfig:
  30
  31  -include config-all-devices.mak
  32
  33 -all: $(DOCS) $(TOOLS) $(HELPERS-y) recurse-all
  34 +all: $(DOCS) $(TOOLS) vma$(EXESUF) $(HELPERS-y) recurse-all
  35
  36  config-host.h: config-host.h-timestamp
  37  config-host.h-timestamp: config-host.mak
  38 @@ -194,6 +194,7 @@ tools-obj-$(CONFIG_POSIX) += compatfd.o
  39  qemu-img$(EXESUF): qemu-img.o $(tools-obj-y) $(block-obj-y) libqemustub.a
  40  qemu-nbd$(EXESUF): qemu-nbd.o $(tools-obj-y) $(block-obj-y) libqemustub.a
  41  qemu-io$(EXESUF): qemu-io.o cmd.o $(tools-obj-y) $(block-obj-y) libqemustub.a
  42 +vma$(EXESUF): vma.o vma-writer.o vma-reader.o $(tools-obj-y) $(block-obj-y) libqemustub.a
  43
  44  qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o
  45
  46 diff --git a/Makefile.objs b/Makefile.objs
  47 index cb46be5..b5732e2 100644
  48 --- a/Makefile.objs
  49 +++ b/Makefile.objs
  50 @@ -48,7 +48,7 @@ coroutine-obj-$(CONFIG_WIN32) += coroutine-win32.o
  51  block-obj-y = iov.o cache-utils.o qemu-option.o module.o async.o
  52  block-obj-y += nbd.o block.o blockjob.o aes.o qemu-config.o
  53  block-obj-y += thread-pool.o qemu-progress.o qemu-sockets.o uri.o notify.o
  54 -block-obj-y += backup.o
  55 +block-obj-y += vma-writer.o backup.o
  56  block-obj-y += $(coroutine-obj-y) $(qobject-obj-y) $(version-obj-y)
  57  block-obj-$(CONFIG_POSIX) += event_notifier-posix.o aio-posix.o
  58  block-obj-$(CONFIG_WIN32) += event_notifier-win32.o aio-win32.o
  59 diff --git a/blockdev.c b/blockdev.c
  60 index 08ac7ad..e16091f 100644
  61 --- a/blockdev.c
  62 +++ b/blockdev.c
  63 @@ -21,6 +21,7 @@
  64  #include "trace.h"
  65  #include "arch_init.h"
  66  #include "backup.h"
  67 +#include "vma.h"
  68
  69  static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
  70
  71 @@ -1483,10 +1484,11 @@ char *qmp_backup(const char *backupfile, bool has_format, BackupFormat format,
  72      /* Todo: try to auto-detect format based on file name */
  73      format = has_format ? format : BACKUP_FORMAT_VMA;
  74
  75 -    /* fixme: find driver for specifued format */
  76      const BackupDriver *driver = NULL;
  77
  78 -    if (!driver) {
  79 +    if (format == BACKUP_FORMAT_VMA) {
  80 +        driver = &backup_vma_driver;
  81 +    } else {
  82          error_set(errp, ERROR_CLASS_GENERIC_ERROR, "unknown backup format");
  83          return NULL;
  84      }
  85 diff --git a/docs/specs/vma_spec.txt b/docs/specs/vma_spec.txt
  86 new file mode 100644
  87 index 0000000..052c629
  88 --- /dev/null
  89 +++ b/docs/specs/vma_spec.txt
  90 @@ -0,0 +1,24 @@
  91 +=Virtual Machine Archive format (VMA)=
  92 +
  93 +This format contains a header which includes the VM configuration as
  94 +binary blobs, and a list of devices (dev_id, name).
  95 +
  96 +The actual VM image data is stored inside extents. An extent contains
  97 +up to 64 clusters, and start with a 512 byte header containing
  98 +additional information for those clusters.
  99 +
 100 +We use a cluster size of 65536, and use 8 bytes for each
 101 +cluster in the header to store the following information:
 102 +
 103 +* 1 byte dev_id (to identity the drive)
 104 +* 2 bytes zero indicator (mark zero regions (16x4096))
 105 +* 4 bytes cluster number
 106 +* 1 byte not used (reserved)
 107 +
 108 +We only store non-zero blocks (such block is 4096 bytes).
 109 +
 110 +Each archive is marked with a uuid. The archive header and all
 111 +extent headers includes that uuid and a MD5 checksum (over header
 112 +data).
 113 +
 114 +
 115 diff --git a/vma-reader.c b/vma-reader.c
 116 new file mode 100644
 117 index 0000000..b6a550b
 118 --- /dev/null
 119 +++ b/vma-reader.c
 120 @@ -0,0 +1,801 @@
 121 +/*
 122 + * VMA: Virtual Machine Archive
 123 + *
 124 + * Copyright (C) 2012 Proxmox Server Solutions
 125 + *
 126 + * Authors:
 127 + *  Dietmar Maurer (dietmar@proxmox.com)
 128 + *
 129 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
 130 + * See the COPYING file in the top-level directory.
 131 + *
 132 + */
 133 +
 134 +#include <stdio.h>
 135 +#include <errno.h>
 136 +#include <unistd.h>
 137 +#include <stdio.h>
 138 +#include <string.h>
 139 +#include <sys/types.h>
 140 +#include <sys/stat.h>
 141 +#include <fcntl.h>
 142 +#include <glib.h>
 143 +#include <uuid/uuid.h>
 144 +
 145 +#include "qemu-common.h"
 146 +#include "qemu_socket.h"
 147 +#include "qemu-coroutine.h"
 148 +#include "qemu-aio.h"
 149 +#include "qemu/ratelimit.h"
 150 +#include "vma.h"
 151 +#include "block.h"
 152 +
 153 +#define BITS_PER_LONG  (sizeof(unsigned long) * 8)
 154 +
 155 +static unsigned char zero_vma_block[VMA_BLOCK_SIZE];
 156 +
 157 +typedef struct VmaRestoreState {
 158 +    BlockDriverState *bs;
 159 +    bool write_zeroes;
 160 +    unsigned long *bitmap;
 161 +    int bitmap_size;
 162 +}  VmaRestoreState;
 163 +
 164 +struct VmaReader {
 165 +    int fd;
 166 +    GChecksum *md5csum;
 167 +    GHashTable *blob_hash;
 168 +    unsigned char *head_data;
 169 +    VmaDeviceInfo devinfo[256];
 170 +    VmaRestoreState rstate[256];
 171 +    GList *cdata_list;
 172 +    guint8 vmstate_stream;
 173 +    uint32_t vmstate_clusters;
 174 +    /* to show restore percentage if run with -v */
 175 +    time_t start_time;
 176 +    int64_t cluster_count;
 177 +    int64_t clusters_read;
 178 +    int clusters_read_per;
 179 +};
 180 +
 181 +static guint
 182 +g_int32_hash(gconstpointer v)
 183 +{
 184 +    return *(const uint32_t *)v;
 185 +}
 186 +
 187 +static gboolean
 188 +g_int32_equal(gconstpointer v1, gconstpointer v2)
 189 +{
 190 +    return *((const uint32_t *)v1) == *((const uint32_t *)v2);
 191 +}
 192 +
 193 +static int vma_reader_get_bitmap(VmaRestoreState *rstate, int64_t cluster_num)
 194 +{
 195 +    assert(rstate);
 196 +    assert(rstate->bitmap);
 197 +
 198 +    unsigned long val, idx, bit;
 199 +
 200 +    idx = cluster_num / BITS_PER_LONG;
 201 +
 202 +    assert(rstate->bitmap_size > idx);
 203 +
 204 +    bit = cluster_num % BITS_PER_LONG;
 205 +    val = rstate->bitmap[idx];
 206 +
 207 +    return !!(val & (1UL << bit));
 208 +}
 209 +
 210 +static void vma_reader_set_bitmap(VmaRestoreState *rstate, int64_t cluster_num,
 211 +                                  int dirty)
 212 +{
 213 +    assert(rstate);
 214 +    assert(rstate->bitmap);
 215 +
 216 +    unsigned long val, idx, bit;
 217 +
 218 +    idx = cluster_num / BITS_PER_LONG;
 219 +
 220 +    assert(rstate->bitmap_size > idx);
 221 +
 222 +    bit = cluster_num % BITS_PER_LONG;
 223 +    val = rstate->bitmap[idx];
 224 +    if (dirty) {
 225 +        if (!(val & (1UL << bit))) {
 226 +            val |= 1UL << bit;
 227 +        }
 228 +    } else {
 229 +        if (val & (1UL << bit)) {
 230 +            val &= ~(1UL << bit);
 231 +        }
 232 +    }
 233 +    rstate->bitmap[idx] = val;
 234 +}
 235 +
 236 +typedef struct VmaBlob {
 237 +    uint32_t start;
 238 +    uint32_t len;
 239 +    void *data;
 240 +} VmaBlob;
 241 +
 242 +static const VmaBlob *get_header_blob(VmaReader *vmar, uint32_t pos)
 243 +{
 244 +    assert(vmar);
 245 +    assert(vmar->blob_hash);
 246 +
 247 +    return g_hash_table_lookup(vmar->blob_hash, &pos);
 248 +}
 249 +
 250 +static const char *get_header_str(VmaReader *vmar, uint32_t pos)
 251 +{
 252 +    const VmaBlob *blob = get_header_blob(vmar, pos);
 253 +    if (!blob) {
 254 +        return NULL;
 255 +    }
 256 +    const char *res = (char *)blob->data;
 257 +    if (res[blob->len-1] != '\0') {
 258 +        return NULL;
 259 +    }
 260 +    return res;
 261 +}
 262 +
 263 +static ssize_t
 264 +safe_read(int fd, unsigned char *buf, size_t count)
 265 +{
 266 +    ssize_t n;
 267 +
 268 +    do {
 269 +        n = read(fd, buf, count);
 270 +    } while (n < 0 && errno == EINTR);
 271 +
 272 +    return n;
 273 +}
 274 +
 275 +static ssize_t
 276 +full_read(int fd, unsigned char *buf, size_t len)
 277 +{
 278 +    ssize_t n;
 279 +    size_t total;
 280 +
 281 +    total = 0;
 282 +
 283 +    while (len > 0) {
 284 +        n = safe_read(fd, buf, len);
 285 +
 286 +        if (n == 0) {
 287 +            return total;
 288 +        }
 289 +
 290 +        if (n <= 0) {
 291 +            break;
 292 +        }
 293 +
 294 +        buf += n;
 295 +        total += n;
 296 +        len -= n;
 297 +    }
 298 +
 299 +    if (len) {
 300 +        return -1;
 301 +    }
 302 +
 303 +    return total;
 304 +}
 305 +
 306 +void vma_reader_destroy(VmaReader *vmar)
 307 +{
 308 +    assert(vmar);
 309 +
 310 +    if (vmar->fd >= 0) {
 311 +        close(vmar->fd);
 312 +    }
 313 +
 314 +    if (vmar->cdata_list) {
 315 +        g_list_free(vmar->cdata_list);
 316 +    }
 317 +
 318 +    int i;
 319 +    for (i = 1; i < 256; i++) {
 320 +        if (vmar->rstate[i].bitmap) {
 321 +            g_free(vmar->rstate[i].bitmap);
 322 +        }
 323 +    }
 324 +
 325 +    if (vmar->md5csum) {
 326 +        g_checksum_free(vmar->md5csum);
 327 +    }
 328 +
 329 +    if (vmar->blob_hash) {
 330 +        g_hash_table_destroy(vmar->blob_hash);
 331 +    }
 332 +
 333 +    if (vmar->head_data) {
 334 +        g_free(vmar->head_data);
 335 +    }
 336 +
 337 +    g_free(vmar);
 338 +
 339 +};
 340 +
 341 +static int vma_reader_read_head(VmaReader *vmar, Error **errp)
 342 +{
 343 +    assert(vmar);
 344 +    assert(errp);
 345 +    assert(*errp == NULL);
 346 +
 347 +    unsigned char md5sum[16];
 348 +    int i;
 349 +    int ret = 0;
 350 +
 351 +    vmar->head_data = g_malloc(sizeof(VmaHeader));
 352 +
 353 +    if (full_read(vmar->fd, vmar->head_data, sizeof(VmaHeader)) !=
 354 +        sizeof(VmaHeader)) {
 355 +        error_setg(errp, "can't read vma header - %s",
 356 +                   errno ? strerror(errno) : "got EOF");
 357 +        return -1;
 358 +    }
 359 +
 360 +    VmaHeader *h = (VmaHeader *)vmar->head_data;
 361 +
 362 +    if (h->magic != VMA_MAGIC) {
 363 +        error_setg(errp, "not a vma file - wrong magic number");
 364 +        return -1;
 365 +    }
 366 +
 367 +    uint32_t header_size = GUINT32_FROM_BE(h->header_size);
 368 +    int need = header_size - sizeof(VmaHeader);
 369 +    if (need <= 0) {
 370 +        error_setg(errp, "wrong vma header size %d", header_size);
 371 +        return -1;
 372 +    }
 373 +
 374 +    vmar->head_data = g_realloc(vmar->head_data, header_size);
 375 +    h = (VmaHeader *)vmar->head_data;
 376 +
 377 +    if (full_read(vmar->fd, vmar->head_data + sizeof(VmaHeader), need) !=
 378 +        need) {
 379 +        error_setg(errp, "can't read vma header data - %s",
 380 +                   errno ? strerror(errno) : "got EOF");
 381 +        return -1;
 382 +    }
 383 +
 384 +    memcpy(md5sum, h->md5sum, 16);
 385 +    memset(h->md5sum, 0, 16);
 386 +
 387 +    g_checksum_reset(vmar->md5csum);
 388 +    g_checksum_update(vmar->md5csum, vmar->head_data, header_size);
 389 +    gsize csize = 16;
 390 +    g_checksum_get_digest(vmar->md5csum, (guint8 *)(h->md5sum), &csize);
 391 +
 392 +    if (memcmp(md5sum, h->md5sum, 16) != 0) {
 393 +        error_setg(errp, "wrong vma header chechsum");
 394 +        return -1;
 395 +    }
 396 +
 397 +    /* we can modify header data after checksum verify */
 398 +    h->header_size = header_size;
 399 +
 400 +    h->version = GUINT32_FROM_BE(h->version);
 401 +    if (h->version != 1) {
 402 +        error_setg(errp, "wrong vma version %d", h->version);
 403 +        return -1;
 404 +    }
 405 +
 406 +    h->ctime = GUINT64_FROM_BE(h->ctime);
 407 +    h->blob_buffer_offset = GUINT32_FROM_BE(h->blob_buffer_offset);
 408 +    h->blob_buffer_size = GUINT32_FROM_BE(h->blob_buffer_size);
 409 +
 410 +    uint32_t bstart = h->blob_buffer_offset + 1;
 411 +    uint32_t bend = h->blob_buffer_offset + h->blob_buffer_size;
 412 +
 413 +    if (bstart <= sizeof(VmaHeader)) {
 414 +        error_setg(errp, "wrong vma blob buffer offset %d",
 415 +                   h->blob_buffer_offset);
 416 +        return -1;
 417 +    }
 418 +
 419 +    if (bend > header_size) {
 420 +        error_setg(errp, "wrong vma blob buffer size %d/%d",
 421 +                   h->blob_buffer_offset, h->blob_buffer_size);
 422 +        return -1;
 423 +    }
 424 +
 425 +    while ((bstart + 2) <= bend) {
 426 +        uint32_t size = vmar->head_data[bstart] +
 427 +            (vmar->head_data[bstart+1] << 8);
 428 +        if ((bstart + size + 2) <= bend) {
 429 +            VmaBlob *blob = g_new0(VmaBlob, 1);
 430 +            blob->start = bstart - h->blob_buffer_offset;
 431 +            blob->len = size;
 432 +            blob->data = vmar->head_data + bstart + 2;
 433 +            g_hash_table_insert(vmar->blob_hash, &blob->start, blob);
 434 +        }
 435 +        bstart += size + 2;
 436 +    }
 437 +
 438 +
 439 +    int count = 0;
 440 +    for (i = 1; i < 256; i++) {
 441 +        VmaDeviceInfoHeader *dih = &h->dev_info[i];
 442 +        uint32_t devname_ptr = GUINT32_FROM_BE(dih->devname_ptr);
 443 +        uint64_t size = GUINT64_FROM_BE(dih->size);
 444 +        const char *devname =  get_header_str(vmar, devname_ptr);
 445 +
 446 +        if (size && devname) {
 447 +            count++;
 448 +            vmar->devinfo[i].size = size;
 449 +            vmar->devinfo[i].devname = devname;
 450 +
 451 +            if (strcmp(devname, "vmstate") == 0) {
 452 +                vmar->vmstate_stream = i;
 453 +            }
 454 +        }
 455 +    }
 456 +
 457 +    if (!count) {
 458 +        error_setg(errp, "vma does not contain data");
 459 +        return -1;
 460 +    }
 461 +
 462 +    for (i = 0; i < VMA_MAX_CONFIGS; i++) {
 463 +        uint32_t name_ptr = GUINT32_FROM_BE(h->config_names[i]);
 464 +        uint32_t data_ptr = GUINT32_FROM_BE(h->config_data[i]);
 465 +
 466 +        if (!(name_ptr && data_ptr)) {
 467 +            continue;
 468 +        }
 469 +        const char *name =  get_header_str(vmar, name_ptr);
 470 +        const VmaBlob *blob = get_header_blob(vmar, data_ptr);
 471 +
 472 +        if (!(name && blob)) {
 473 +            error_setg(errp, "vma contains invalid data pointers");
 474 +            return -1;
 475 +        }
 476 +
 477 +        VmaConfigData *cdata = g_new0(VmaConfigData, 1);
 478 +        cdata->name = name;
 479 +        cdata->data = blob->data;
 480 +        cdata->len = blob->len;
 481 +
 482 +        vmar->cdata_list = g_list_append(vmar->cdata_list, cdata);
 483 +    }
 484 +
 485 +    return ret;
 486 +};
 487 +
 488 +VmaReader *vma_reader_create(const char *filename, Error **errp)
 489 +{
 490 +    assert(filename);
 491 +    assert(errp);
 492 +
 493 +    VmaReader *vmar = g_new0(VmaReader, 1);
 494 +
 495 +    if (strcmp(filename, "-") == 0) {
 496 +        vmar->fd = dup(0);
 497 +    } else {
 498 +        vmar->fd = open(filename, O_RDONLY);
 499 +    }
 500 +
 501 +    if (vmar->fd < 0) {
 502 +        error_setg(errp, "can't open file %s - %s\n", filename,
 503 +                   strerror(errno));
 504 +        goto err;
 505 +    }
 506 +
 507 +    vmar->md5csum = g_checksum_new(G_CHECKSUM_MD5);
 508 +    if (!vmar->md5csum) {
 509 +        error_setg(errp, "can't allocate cmsum\n");
 510 +        goto err;
 511 +    }
 512 +
 513 +    vmar->blob_hash = g_hash_table_new_full(g_int32_hash, g_int32_equal,
 514 +                                            NULL, g_free);
 515 +
 516 +    if (vma_reader_read_head(vmar, errp) < 0) {
 517 +        goto err;
 518 +    }
 519 +
 520 +    return vmar;
 521 +
 522 +err:
 523 +    if (vmar) {
 524 +        vma_reader_destroy(vmar);
 525 +    }
 526 +
 527 +    return NULL;
 528 +}
 529 +
 530 +VmaHeader *vma_reader_get_header(VmaReader *vmar)
 531 +{
 532 +    assert(vmar);
 533 +    assert(vmar->head_data);
 534 +
 535 +    return (VmaHeader *)(vmar->head_data);
 536 +}
 537 +
 538 +GList *vma_reader_get_config_data(VmaReader *vmar)
 539 +{
 540 +    assert(vmar);
 541 +    assert(vmar->head_data);
 542 +
 543 +    return vmar->cdata_list;
 544 +}
 545 +
 546 +VmaDeviceInfo *vma_reader_get_device_info(VmaReader *vmar, guint8 dev_id)
 547 +{
 548 +    assert(vmar);
 549 +    assert(dev_id);
 550 +
 551 +    if (vmar->devinfo[dev_id].size && vmar->devinfo[dev_id].devname) {
 552 +        return &vmar->devinfo[dev_id];
 553 +    }
 554 +
 555 +    return NULL;
 556 +}
 557 +
 558 +int vma_reader_register_bs(VmaReader *vmar, guint8 dev_id, BlockDriverState *bs,
 559 +                           bool write_zeroes, Error **errp)
 560 +{
 561 +    assert(vmar);
 562 +    assert(bs != NULL);
 563 +    assert(dev_id);
 564 +    assert(vmar->rstate[dev_id].bs == NULL);
 565 +
 566 +    int64_t size = bdrv_getlength(bs);
 567 +    if (size != vmar->devinfo[dev_id].size) {
 568 +        error_setg(errp, "vma_reader_register_bs for stream %s failed - "
 569 +                   "unexpected size %zd != %zd", vmar->devinfo[dev_id].devname,
 570 +                   size, vmar->devinfo[dev_id].size);
 571 +        return -1;
 572 +    }
 573 +
 574 +    vmar->rstate[dev_id].bs = bs;
 575 +    vmar->rstate[dev_id].write_zeroes = write_zeroes;
 576 +
 577 +    int64_t bitmap_size = (size/BDRV_SECTOR_SIZE) +
 578 +        (VMA_CLUSTER_SIZE/BDRV_SECTOR_SIZE) * BITS_PER_LONG - 1;
 579 +    bitmap_size /= (VMA_CLUSTER_SIZE/BDRV_SECTOR_SIZE) * BITS_PER_LONG;
 580 +
 581 +    vmar->rstate[dev_id].bitmap_size = bitmap_size;
 582 +    vmar->rstate[dev_id].bitmap = g_new0(unsigned long, bitmap_size);
 583 +
 584 +    vmar->cluster_count += size/VMA_CLUSTER_SIZE;
 585 +
 586 +    return 0;
 587 +}
 588 +
 589 +static ssize_t safe_write(int fd, void *buf, size_t count)
 590 +{
 591 +    ssize_t n;
 592 +
 593 +    do {
 594 +        n = write(fd, buf, count);
 595 +    } while (n < 0 && errno == EINTR);
 596 +
 597 +    return n;
 598 +}
 599 +
 600 +static size_t full_write(int fd, void *buf, size_t len)
 601 +{
 602 +    ssize_t n;
 603 +    size_t total;
 604 +
 605 +    total = 0;
 606 +
 607 +    while (len > 0) {
 608 +        n = safe_write(fd, buf, len);
 609 +        if (n < 0) {
 610 +            return n;
 611 +        }
 612 +        buf += n;
 613 +        total += n;
 614 +        len -= n;
 615 +    }
 616 +
 617 +    if (len) {
 618 +        /* incomplete write ? */
 619 +        return -1;
 620 +    }
 621 +
 622 +    return total;
 623 +}
 624 +
 625 +static int restore_write_data(VmaReader *vmar, guint8 dev_id,
 626 +                              BlockDriverState *bs, int vmstate_fd,
 627 +                              unsigned char *buf, int64_t sector_num,
 628 +                              int nb_sectors, Error **errp)
 629 +{
 630 +    assert(vmar);
 631 +
 632 +    if (dev_id == vmar->vmstate_stream) {
 633 +        if (vmstate_fd >= 0) {
 634 +            int len = nb_sectors * BDRV_SECTOR_SIZE;
 635 +            int res = full_write(vmstate_fd, buf, len);
 636 +            if (res < 0) {
 637 +                error_setg(errp, "write vmstate failed %d", res);
 638 +                return -1;
 639 +            }
 640 +        }
 641 +    } else {
 642 +        int res = bdrv_write(bs, sector_num, buf, nb_sectors);
 643 +        if (res < 0) {
 644 +            error_setg(errp, "bdrv_write to %s failed (%d)",
 645 +                       bdrv_get_device_name(bs), res);
 646 +            return -1;
 647 +        }
 648 +    }
 649 +    return 0;
 650 +}
 651 +static int restore_extent(VmaReader *vmar, unsigned char *buf,
 652 +                          int extent_size, int vmstate_fd,
 653 +                          bool verbose, Error **errp)
 654 +{
 655 +    assert(vmar);
 656 +    assert(buf);
 657 +
 658 +    VmaExtentHeader *ehead = (VmaExtentHeader *)buf;
 659 +    int start = VMA_EXTENT_HEADER_SIZE;
 660 +    int i;
 661 +
 662 +    for (i = 0; i < VMA_BLOCKS_PER_EXTENT; i++) {
 663 +        uint64_t block_info = GUINT64_FROM_BE(ehead->blockinfo[i]);
 664 +        uint64_t cluster_num = block_info & 0xffffffff;
 665 +        uint8_t dev_id = (block_info >> 32) & 0xff;
 666 +        uint16_t mask = block_info >> (32+16);
 667 +        int64_t max_sector;
 668 +
 669 +        if (!dev_id) {
 670 +            continue;
 671 +        }
 672 +
 673 +        VmaRestoreState *rstate = &vmar->rstate[dev_id];
 674 +        BlockDriverState *bs = NULL;
 675 +
 676 +        if (dev_id != vmar->vmstate_stream) {
 677 +            bs = rstate->bs;
 678 +            if (!bs) {
 679 +                error_setg(errp, "got wrong dev id %d", dev_id);
 680 +                return -1;
 681 +            }
 682 +
 683 +            if (vma_reader_get_bitmap(rstate, cluster_num)) {
 684 +                error_setg(errp, "found duplicated cluster %zd for stream %s",
 685 +                          cluster_num, vmar->devinfo[dev_id].devname);
 686 +                return -1;
 687 +            }
 688 +            vma_reader_set_bitmap(rstate, cluster_num, 1);
 689 +
 690 +            max_sector = vmar->devinfo[dev_id].size/BDRV_SECTOR_SIZE;
 691 +        } else {
 692 +            max_sector = G_MAXINT64;
 693 +            if (cluster_num != vmar->vmstate_clusters) {
 694 +                error_setg(errp, "found out of order vmstate data");
 695 +                return -1;
 696 +            }
 697 +            vmar->vmstate_clusters++;
 698 +        }
 699 +
 700 +        vmar->clusters_read++;
 701 +
 702 +        if (verbose) {
 703 +            time_t duration = time(NULL) - vmar->start_time;
 704 +            int percent = (vmar->clusters_read*100)/vmar->cluster_count;
 705 +            if (percent != vmar->clusters_read_per) {
 706 +                printf("progress %d%% (read %zd bytes, duration %zd sec)\n",
 707 +                       percent, vmar->clusters_read*VMA_CLUSTER_SIZE,
 708 +                       duration);
 709 +                fflush(stdout);
 710 +                vmar->clusters_read_per = percent;
 711 +            }
 712 +        }
 713 +
 714 +        /* try to write whole clusters to speedup restore */
 715 +        if (mask == 0xffff) {
 716 +            if ((start + VMA_CLUSTER_SIZE) > extent_size) {
 717 +                error_setg(errp, "short vma extent - too many blocks");
 718 +                return -1;
 719 +            }
 720 +            int64_t sector_num = (cluster_num * VMA_CLUSTER_SIZE) /
 721 +                BDRV_SECTOR_SIZE;
 722 +            int64_t end_sector = sector_num +
 723 +                VMA_CLUSTER_SIZE/BDRV_SECTOR_SIZE;
 724 +
 725 +            if (end_sector > max_sector) {
 726 +                end_sector = max_sector;
 727 +            }
 728 +
 729 +            if (end_sector <= sector_num) {
 730 +                error_setg(errp, "got wrong block address - write bejond end");
 731 +                return -1;
 732 +            }
 733 +
 734 +            int nb_sectors = end_sector - sector_num;
 735 +            if (restore_write_data(vmar, dev_id, bs, vmstate_fd, buf + start,
 736 +                                   sector_num, nb_sectors, errp) < 0) {
 737 +                return -1;
 738 +            }
 739 +
 740 +            start += VMA_CLUSTER_SIZE;
 741 +        } else {
 742 +            int j;
 743 +            int bit = 1;
 744 +
 745 +            for (j = 0; j < 16; j++) {
 746 +                int64_t sector_num = (cluster_num*VMA_CLUSTER_SIZE +
 747 +                                      j*VMA_BLOCK_SIZE)/BDRV_SECTOR_SIZE;
 748 +
 749 +                int64_t end_sector = sector_num +
 750 +                    VMA_BLOCK_SIZE/BDRV_SECTOR_SIZE;
 751 +                if (end_sector > max_sector) {
 752 +                    end_sector = max_sector;
 753 +                }
 754 +
 755 +                if (mask & bit) {
 756 +                    if ((start + VMA_BLOCK_SIZE) > extent_size) {
 757 +                        error_setg(errp, "short vma extent - too many blocks");
 758 +                        return -1;
 759 +                    }
 760 +
 761 +                    if (end_sector <= sector_num) {
 762 +                        error_setg(errp, "got wrong block address - "
 763 +                                   "write bejond end");
 764 +                        return -1;
 765 +                    }
 766 +
 767 +                    int nb_sectors = end_sector - sector_num;
 768 +                    if (restore_write_data(vmar, dev_id, bs, vmstate_fd,
 769 +                                           buf + start, sector_num,
 770 +                                           nb_sectors, errp) < 0) {
 771 +                        return -1;
 772 +                    }
 773 +
 774 +                    start += VMA_BLOCK_SIZE;
 775 +
 776 +                } else {
 777 +
 778 +                    if (rstate->write_zeroes && (end_sector > sector_num)) {
 779 +                        /* Todo: use bdrv_co_write_zeroes (but that need to
 780 +                         * be run inside coroutine?)
 781 +                         */
 782 +                        int nb_sectors = end_sector - sector_num;
 783 +                        if (restore_write_data(vmar, dev_id, bs, vmstate_fd,
 784 +                                              zero_vma_block, sector_num,
 785 +                                               nb_sectors, errp) < 0) {
 786 +                            return -1;
 787 +                        }
 788 +                    }
 789 +                }
 790 +
 791 +                bit = bit << 1;
 792 +            }
 793 +        }
 794 +    }
 795 +
 796 +    if (start != extent_size) {
 797 +        error_setg(errp, "vma extent error - missing blocks");
 798 +        return -1;
 799 +    }
 800 +
 801 +    return 0;
 802 +}
 803 +
 804 +int vma_reader_restore(VmaReader *vmar, int vmstate_fd, bool verbose,
 805 +                      Error **errp)
 806 +{
 807 +    assert(vmar);
 808 +    assert(vmar->head_data);
 809 +
 810 +    int ret = 0;
 811 +    unsigned char buf[VMA_MAX_EXTENT_SIZE];
 812 +    int buf_pos = 0;
 813 +    unsigned char md5sum[16];
 814 +    VmaHeader *h = (VmaHeader *)vmar->head_data;
 815 +
 816 +    vmar->start_time = time(NULL);
 817 +
 818 +    while (1) {
 819 +        int bytes = full_read(vmar->fd, buf + buf_pos, sizeof(buf) - buf_pos);
 820 +        if (bytes < 0) {
 821 +            error_setg(errp, "read failed - %s", strerror(errno));
 822 +            return -1;
 823 +        }
 824 +
 825 +        buf_pos += bytes;
 826 +
 827 +        if (!buf_pos) {
 828 +            break; /* EOF */
 829 +        }
 830 +
 831 +        if (buf_pos < VMA_EXTENT_HEADER_SIZE) {
 832 +            error_setg(errp, "read short extent (%d bytes)", buf_pos);
 833 +            return -1;
 834 +        }
 835 +
 836 +        VmaExtentHeader *ehead = (VmaExtentHeader *)buf;
 837 +
 838 +        /* extract md5sum */
 839 +        memcpy(md5sum, ehead->md5sum, sizeof(ehead->md5sum));
 840 +        memset(ehead->md5sum, 0, sizeof(ehead->md5sum));
 841 +
 842 +        g_checksum_reset(vmar->md5csum);
 843 +        g_checksum_update(vmar->md5csum, buf, VMA_EXTENT_HEADER_SIZE);
 844 +        gsize csize = 16;
 845 +        g_checksum_get_digest(vmar->md5csum, ehead->md5sum, &csize);
 846 +
 847 +        if (memcmp(md5sum, ehead->md5sum, 16) != 0) {
 848 +            error_setg(errp, "wrong vma extent header chechsum");
 849 +            return -1;
 850 +        }
 851 +
 852 +        if (memcmp(h->uuid, ehead->uuid, sizeof(ehead->uuid)) != 0) {
 853 +            error_setg(errp, "wrong vma extent uuid");
 854 +            return -1;
 855 +        }
 856 +
 857 +        if (ehead->magic != VMA_EXTENT_MAGIC || ehead->reserved1 != 0) {
 858 +            error_setg(errp, "wrong vma extent header magic");
 859 +            return -1;
 860 +        }
 861 +
 862 +        int block_count = GUINT16_FROM_BE(ehead->block_count);
 863 +        int extent_size = VMA_EXTENT_HEADER_SIZE + block_count*VMA_BLOCK_SIZE;
 864 +
 865 +        if (buf_pos < extent_size) {
 866 +            error_setg(errp, "short vma extent (%d < %d)", buf_pos,
 867 +                       extent_size);
 868 +            return -1;
 869 +        }
 870 +
 871 +        if (restore_extent(vmar, buf, extent_size, vmstate_fd, verbose,
 872 +                           errp) < 0) {
 873 +            return -1;
 874 +        }
 875 +
 876 +        if (buf_pos > extent_size) {
 877 +            memmove(buf, buf + extent_size, buf_pos - extent_size);
 878 +            buf_pos = buf_pos - extent_size;
 879 +        } else {
 880 +            buf_pos = 0;
 881 +        }
 882 +    }
 883 +
 884 +    bdrv_drain_all();
 885 +
 886 +    int i;
 887 +    for (i = 1; i < 256; i++) {
 888 +        VmaRestoreState *rstate = &vmar->rstate[i];
 889 +        if (!rstate->bs) {
 890 +            continue;
 891 +        }
 892 +
 893 +        if (bdrv_flush(rstate->bs) < 0) {
 894 +            error_setg(errp, "vma bdrv_flush %s failed",
 895 +                       vmar->devinfo[i].devname);
 896 +            return -1;
 897 +        }
 898 +
 899 +        if (vmar->devinfo[i].size &&
 900 +            (strcmp(vmar->devinfo[i].devname, "vmstate") != 0)) {
 901 +            assert(rstate->bitmap);
 902 +
 903 +            int64_t cluster_num, end;
 904 +
 905 +            end = (vmar->devinfo[i].size + VMA_CLUSTER_SIZE - 1) /
 906 +                VMA_CLUSTER_SIZE;
 907 +
 908 +            for (cluster_num = 0; cluster_num < end; cluster_num++) {
 909 +                if (!vma_reader_get_bitmap(rstate, cluster_num)) {
 910 +                    error_setg(errp, "detected missing cluster %zd "
 911 +                               "for stream %s", cluster_num,
 912 +                               vmar->devinfo[i].devname);
 913 +                    return -1;
 914 +                }
 915 +            }
 916 +        }
 917 +    }
 918 +
 919 +    return ret;
 920 +}
 921 +
 922 diff --git a/vma-writer.c b/vma-writer.c
 923 new file mode 100644
 924 index 0000000..c1e1afe
 925 --- /dev/null
 926 +++ b/vma-writer.c
 927 @@ -0,0 +1,920 @@
 928 +/*
 929 + * VMA: Virtual Machine Archive
 930 + *
 931 + * Copyright (C) 2012 Proxmox Server Solutions
 932 + *
 933 + * Authors:
 934 + *  Dietmar Maurer (dietmar@proxmox.com)
 935 + *
 936 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
 937 + * See the COPYING file in the top-level directory.
 938 + *
 939 + */
 940 +
 941 +#include <stdio.h>
 942 +#include <errno.h>
 943 +#include <unistd.h>
 944 +#include <stdio.h>
 945 +#include <string.h>
 946 +#include <sys/types.h>
 947 +#include <sys/stat.h>
 948 +#include <fcntl.h>
 949 +#include <glib.h>
 950 +#include <uuid/uuid.h>
 951 +
 952 +#include "qemu-common.h"
 953 +#include "qemu_socket.h"
 954 +#include "qemu-coroutine.h"
 955 +#include "qemu-aio.h"
 956 +#include "qemu/ratelimit.h"
 957 +#include "vma.h"
 958 +#include "block.h"
 959 +#include "monitor.h"
 960 +
 961 +#define DEBUG_VMA 0
 962 +
 963 +#define DPRINTF(fmt, ...)\
 964 +    do { if (DEBUG_VMA) { printf("vma: " fmt, ## __VA_ARGS__); } } while (0)
 965 +
 966 +#define WRITE_BUFFERS 5
 967 +
 968 +typedef struct VmaAIOCB VmaAIOCB;
 969 +struct VmaAIOCB {
 970 +    VmaWriter *vmaw;
 971 +    unsigned char buffer[VMA_MAX_EXTENT_SIZE];
 972 +    size_t bytes;
 973 +    Coroutine *co;
 974 +};
 975 +
 976 +struct VmaWriter {
 977 +    int fd;
 978 +    FILE *cmd;
 979 +    int status;
 980 +    char errmsg[8192];
 981 +    uuid_t uuid;
 982 +    bool header_written;
 983 +    bool closed;
 984 +
 985 +    /* we always write extents */
 986 +    unsigned char outbuf[VMA_MAX_EXTENT_SIZE];
 987 +    int outbuf_pos; /* in bytes */
 988 +    int outbuf_count; /* in VMA_BLOCKS */
 989 +    uint64_t outbuf_block_info[VMA_BLOCKS_PER_EXTENT];
 990 +
 991 +    VmaAIOCB aiocbs[WRITE_BUFFERS];
 992 +    CoQueue wqueue;
 993 +
 994 +    GChecksum *md5csum;
 995 +    CoMutex writer_lock;
 996 +    CoMutex flush_lock;
 997 +    Coroutine *co_writer;
 998 +    RateLimit limit;
 999 +    uint64_t delay_ns;
1000 +
1001 +    /* drive informations */
1002 +    VmaStreamInfo stream_info[256];
1003 +    guint stream_count;
1004 +
1005 +    guint8 vmstate_stream;
1006 +    uint32_t vmstate_clusters;
1007 +
1008 +    /* header blob table */
1009 +    char *header_blob_table;
1010 +    uint32_t header_blob_table_size;
1011 +    uint32_t header_blob_table_pos;
1012 +
1013 +    /* store for config blobs */
1014 +    uint32_t config_names[VMA_MAX_CONFIGS]; /* offset into blob_buffer table */
1015 +    uint32_t config_data[VMA_MAX_CONFIGS];  /* offset into blob_buffer table */
1016 +    uint32_t config_count;
1017 +};
1018 +
1019 +void vma_writer_set_error(VmaWriter *vmaw, const char *fmt, ...)
1020 +{
1021 +    va_list ap;
1022 +
1023 +    if (vmaw->status < 0) {
1024 +        return;
1025 +    }
1026 +
1027 +    vmaw->status = -1;
1028 +
1029 +    va_start(ap, fmt);
1030 +    g_vsnprintf(vmaw->errmsg, sizeof(vmaw->errmsg), fmt, ap);
1031 +    va_end(ap);
1032 +
1033 +    DPRINTF("vma_writer_set_error: %s\n", vmaw->errmsg);
1034 +}
1035 +
1036 +static uint32_t allocate_header_blob(VmaWriter *vmaw, const char *data,
1037 +                                     size_t len)
1038 +{
1039 +    if (len > 65535) {
1040 +        return 0;
1041 +    }
1042 +
1043 +    if (!vmaw->header_blob_table ||
1044 +        (vmaw->header_blob_table_size <
1045 +         (vmaw->header_blob_table_pos + len + 2))) {
1046 +        int newsize = vmaw->header_blob_table_size + ((len + 2 + 511)/512)*512;
1047 +
1048 +        vmaw->header_blob_table = g_realloc(vmaw->header_blob_table, newsize);
1049 +        memset(vmaw->header_blob_table + vmaw->header_blob_table_size,
1050 +               0, newsize - vmaw->header_blob_table_size);
1051 +        vmaw->header_blob_table_size = newsize;
1052 +    }
1053 +
1054 +    uint32_t cpos = vmaw->header_blob_table_pos;
1055 +    vmaw->header_blob_table[cpos] = len & 255;
1056 +    vmaw->header_blob_table[cpos+1] = (len >> 8) & 255;
1057 +    memcpy(vmaw->header_blob_table + cpos + 2, data, len);
1058 +    vmaw->header_blob_table_pos += len + 2;
1059 +    return cpos;
1060 +}
1061 +
1062 +static uint32_t allocate_header_string(VmaWriter *vmaw, const char *str)
1063 +{
1064 +    assert(vmaw);
1065 +
1066 +    size_t len = strlen(str) + 1;
1067 +
1068 +    return allocate_header_blob(vmaw, str, len);
1069 +}
1070 +
1071 +int vma_writer_add_config(VmaWriter *vmaw, const char *name, gpointer data,
1072 +                          gsize len)
1073 +{
1074 +    assert(vmaw);
1075 +    assert(!vmaw->header_written);
1076 +    assert(vmaw->config_count < VMA_MAX_CONFIGS);
1077 +    assert(name);
1078 +    assert(data);
1079 +    assert(len);
1080 +
1081 +    uint32_t name_ptr = allocate_header_string(vmaw, name);
1082 +    if (!name_ptr) {
1083 +        return -1;
1084 +    }
1085 +
1086 +    uint32_t data_ptr = allocate_header_blob(vmaw, data, len);
1087 +    if (!data_ptr) {
1088 +        return -1;
1089 +    }
1090 +
1091 +    vmaw->config_names[vmaw->config_count] = name_ptr;
1092 +    vmaw->config_data[vmaw->config_count] = data_ptr;
1093 +
1094 +    vmaw->config_count++;
1095 +
1096 +    return 0;
1097 +}
1098 +
1099 +int vma_writer_register_stream(VmaWriter *vmaw, const char *devname,
1100 +                               size_t size)
1101 +{
1102 +    assert(vmaw);
1103 +    assert(devname);
1104 +    assert(!vmaw->status);
1105 +
1106 +    if (vmaw->header_written) {
1107 +        vma_writer_set_error(vmaw, "vma_writer_register_stream: header "
1108 +                             "already written");
1109 +        return -1;
1110 +    }
1111 +
1112 +    guint n = vmaw->stream_count + 1;
1113 +
1114 +    /* we can have dev_ids form 1 to 255 (0 reserved)
1115 +     * 255(-1) reseverd for safety
1116 +     */
1117 +    if (n > 254) {
1118 +        vma_writer_set_error(vmaw, "vma_writer_register_stream: "
1119 +                             "too many drives");
1120 +        return -1;
1121 +    }
1122 +
1123 +    if (size <= 0) {
1124 +        vma_writer_set_error(vmaw, "vma_writer_register_stream: "
1125 +                             "got strange size %zd", size);
1126 +        return -1;
1127 +    }
1128 +
1129 +    DPRINTF("vma_writer_register_stream %s %zu %d\n", devname, size, n);
1130 +
1131 +    vmaw->stream_info[n].devname = g_strdup(devname);
1132 +    vmaw->stream_info[n].size = size;
1133 +
1134 +    vmaw->stream_info[n].cluster_count = (size + VMA_CLUSTER_SIZE - 1) /
1135 +        VMA_CLUSTER_SIZE;
1136 +
1137 +    vmaw->stream_count = n;
1138 +
1139 +    if (strcmp(devname, "vmstate") == 0) {
1140 +        vmaw->vmstate_stream = n;
1141 +    }
1142 +
1143 +    return n;
1144 +}
1145 +
1146 +static void vma_co_continue_write(void *opaque)
1147 +{
1148 +    VmaWriter *vmaw = opaque;
1149 +
1150 +    qemu_aio_set_fd_handler(vmaw->fd, NULL, NULL, NULL, NULL);
1151 +
1152 +    DPRINTF("vma_co_continue_write\n");
1153 +    qemu_coroutine_enter(vmaw->co_writer, NULL);
1154 +}
1155 +
1156 +static ssize_t coroutine_fn
1157 +vma_co_write(VmaWriter *vmaw, const void *buf, size_t bytes)
1158 +{
1159 +    size_t done = 0;
1160 +    ssize_t ret;
1161 +
1162 +    /* atomic writes (we cannot interleave writes) */
1163 +    qemu_co_mutex_lock(&vmaw->writer_lock);
1164 +
1165 +    DPRINTF("vma_co_write enter %zd\n", bytes);
1166 +
1167 +    while (done < bytes) {
1168 +        ret = write(vmaw->fd, buf + done, bytes - done);
1169 +        if (ret > 0) {
1170 +            done += ret;
1171 +            DPRINTF("vma_co_write written %zd %zd\n", done, ret);
1172 +        } else if (ret < 0) {
1173 +            if (errno == EAGAIN || errno == EWOULDBLOCK) {
1174 +                DPRINTF("vma_co_write yield %zd\n", done);
1175 +
1176 +                vmaw->co_writer = qemu_coroutine_self();
1177 +                qemu_aio_set_fd_handler(vmaw->fd, NULL, vma_co_continue_write,
1178 +                                        NULL, vmaw);
1179 +
1180 +                qemu_coroutine_yield();
1181 +                DPRINTF("vma_co_write restart %zd\n", done);
1182 +            } else {
1183 +                vma_writer_set_error(vmaw, "vma_co_write write error - %s",
1184 +                                     strerror(errno));
1185 +                done = -1; /* always return failure for partial writes */
1186 +                break;
1187 +            }
1188 +        } else if (ret == 0) {
1189 +            /* should not happen - simply try again */
1190 +        }
1191 +    }
1192 +
1193 +    qemu_co_mutex_unlock(&vmaw->writer_lock);
1194 +
1195 +    DPRINTF("vma_co_write leave %zd\n", done);
1196 +    return done;
1197 +}
1198 +
1199 +static void coroutine_fn vma_co_writer_task(void *opaque)
1200 +{
1201 +    VmaAIOCB *cb = opaque;
1202 +
1203 +    DPRINTF("vma_co_writer_task start\n");
1204 +
1205 +    int64_t done = vma_co_write(cb->vmaw, cb->buffer, cb->bytes);
1206 +    DPRINTF("vma_co_writer_task write done %zd\n", done);
1207 +
1208 +    if (done != cb->bytes) {
1209 +        DPRINTF("vma_co_writer_task failed write %zd %zd", cb->bytes, done);
1210 +        vma_writer_set_error(cb->vmaw, "vma_co_writer_task failed write %zd",
1211 +                             done);
1212 +    }
1213 +
1214 +    cb->bytes = 0;
1215 +
1216 +    qemu_co_queue_next(&cb->vmaw->wqueue);
1217 +
1218 +    DPRINTF("vma_co_writer_task end\n");
1219 +}
1220 +
1221 +static void coroutine_fn vma_queue_flush(VmaWriter *vmaw)
1222 +{
1223 +    DPRINTF("vma_queue_flush enter\n");
1224 +
1225 +    assert(vmaw);
1226 +
1227 +    while (1) {
1228 +        int i;
1229 +        VmaAIOCB *cb = NULL;
1230 +        for (i = 0; i < WRITE_BUFFERS; i++) {
1231 +            if (vmaw->aiocbs[i].bytes) {
1232 +                cb = &vmaw->aiocbs[i];
1233 +                DPRINTF("FOUND USED AIO BUFFER %d %zd\n", i,
1234 +                        vmaw->aiocbs[i].bytes);
1235 +                break;
1236 +            }
1237 +        }
1238 +        if (!cb) {
1239 +            break;
1240 +        }
1241 +        qemu_co_queue_wait(&vmaw->wqueue);
1242 +    }
1243 +
1244 +    DPRINTF("vma_queue_flush leave\n");
1245 +}
1246 +
1247 +/**
1248 + * NOTE: pipe buffer size in only 4096 bytes on linux (see 'ulimit -a')
1249 + * So we need to create a coroutione to allow 'parallel' execution.
1250 + */
1251 +static ssize_t coroutine_fn
1252 +vma_queue_write(VmaWriter *vmaw, const void *buf, size_t bytes)
1253 +{
1254 +    DPRINTF("vma_queue_write enter %zd\n", bytes);
1255 +
1256 +    assert(vmaw);
1257 +    assert(buf);
1258 +    assert(bytes <= VMA_MAX_EXTENT_SIZE);
1259 +
1260 +    VmaAIOCB *cb = NULL;
1261 +    while (!cb) {
1262 +        int i;
1263 +        for (i = 0; i < WRITE_BUFFERS; i++) {
1264 +            if (!vmaw->aiocbs[i].bytes) {
1265 +                cb = &vmaw->aiocbs[i];
1266 +                break;
1267 +            }
1268 +        }
1269 +        if (!cb) {
1270 +            qemu_co_queue_wait(&vmaw->wqueue);
1271 +        }
1272 +    }
1273 +
1274 +    memcpy(cb->buffer, buf, bytes);
1275 +    cb->bytes = bytes;
1276 +    cb->vmaw = vmaw;
1277 +
1278 +    DPRINTF("vma_queue_write start %zd\n", bytes);
1279 +    cb->co = qemu_coroutine_create(vma_co_writer_task);
1280 +    qemu_coroutine_enter(cb->co, cb);
1281 +
1282 +    DPRINTF("vma_queue_write leave\n");
1283 +
1284 +    return bytes;
1285 +}
1286 +
1287 +VmaWriter *vma_writer_create(const char *filename, uuid_t uuid, int64_t speed,
1288 +                             Error **errp)
1289 +{
1290 +    const char *p;
1291 +
1292 +    assert(sizeof(VmaHeader) == (4096 + 8192));
1293 +    assert(sizeof(VmaExtentHeader) == 512);
1294 +
1295 +    VmaWriter *vmaw = g_new0(VmaWriter, 1);
1296 +    vmaw->fd = -1;
1297 +
1298 +    vmaw->md5csum = g_checksum_new(G_CHECKSUM_MD5);
1299 +    if (!vmaw->md5csum) {
1300 +        error_setg(errp, "can't allocate cmsum\n");
1301 +        goto err;
1302 +    }
1303 +
1304 +    if (strstart(filename, "exec:", &p)) {
1305 +        vmaw->cmd = popen(p, "w");
1306 +        if (vmaw->cmd == NULL) {
1307 +            error_setg(errp, "can't popen command '%s' - %s\n", p,
1308 +                       strerror(errno));
1309 +            goto err;
1310 +        }
1311 +        vmaw->fd = fileno(vmaw->cmd);
1312 +        socket_set_nonblock(vmaw->fd);
1313 +
1314 +    } else {
1315 +        struct stat st;
1316 +        int oflags;
1317 +       const char *tmp_id_str;
1318 +
1319 +        if ((stat(filename, &st) == 0) && S_ISFIFO(st.st_mode)) {
1320 +            oflags = O_NONBLOCK|O_WRONLY;
1321 +           vmaw->fd = qemu_open(filename, oflags, 0644);
1322 +        } else if (strstart(filename, "/dev/fdset/", &tmp_id_str)) {
1323 +            oflags = O_NONBLOCK|O_WRONLY;
1324 +            vmaw->fd = qemu_open(filename, oflags, 0644);
1325 +       } else if (strstart(filename, "/dev/fdname/", &tmp_id_str)) {
1326 +            vmaw->fd = monitor_get_fd(cur_mon, tmp_id_str, errp);
1327 +            if (vmaw->fd < 0) {
1328 +                goto err;
1329 +            }
1330 +       } else  {
1331 +            oflags = O_NONBLOCK|O_WRONLY|O_CREAT|O_EXCL;
1332 +           vmaw->fd = qemu_open(filename, oflags, 0644);
1333 +        }
1334 +
1335 +        if (vmaw->fd < 0) {
1336 +            error_setg(errp, "can't open file %s - %s\n", filename,
1337 +                       strerror(errno));
1338 +            goto err;
1339 +        }
1340 +    }
1341 +
1342 +    vmaw->outbuf_count = 0;
1343 +    vmaw->outbuf_pos = VMA_EXTENT_HEADER_SIZE;
1344 +
1345 +    vmaw->header_blob_table_pos = 1; /* start at pos 1 */
1346 +
1347 +    qemu_co_mutex_init(&vmaw->writer_lock);
1348 +    qemu_co_mutex_init(&vmaw->flush_lock);
1349 +    qemu_co_queue_init(&vmaw->wqueue);
1350 +
1351 +    uuid_copy(vmaw->uuid, uuid);
1352 +
1353 +    if (speed <= 0) {
1354 +        speed = 10*1024*1024*1024LLU; /* default 10GB/s */
1355 +    }
1356 +
1357 +    ratelimit_set_speed(&vmaw->limit, speed, 100000000ULL /* 0.1 sec */);
1358 +
1359 +    return vmaw;
1360 +
1361 +err:
1362 +    if (vmaw) {
1363 +        if (vmaw->cmd) {
1364 +            pclose(vmaw->cmd);
1365 +        } else if (vmaw->fd >= 0) {
1366 +            close(vmaw->fd);
1367 +        }
1368 +
1369 +        if (vmaw->md5csum) {
1370 +            g_checksum_free(vmaw->md5csum);
1371 +        }
1372 +
1373 +        g_free(vmaw);
1374 +    }
1375 +
1376 +    return NULL;
1377 +}
1378 +
1379 +static int coroutine_fn vma_write_header(VmaWriter *vmaw)
1380 +{
1381 +    assert(vmaw);
1382 +    int header_clusters = 8;
1383 +    char buf[65536*header_clusters];
1384 +    VmaHeader *head = (VmaHeader *)buf;
1385 +
1386 +    int i;
1387 +
1388 +    DPRINTF("VMA WRITE HEADER\n");
1389 +
1390 +    if (vmaw->status < 0) {
1391 +        return vmaw->status;
1392 +    }
1393 +
1394 +    memset(buf, 0, sizeof(buf));
1395 +
1396 +    head->magic = VMA_MAGIC;
1397 +    head->version = GUINT32_TO_BE(1); /* v1 */
1398 +    memcpy(head->uuid, vmaw->uuid, 16);
1399 +
1400 +    time_t ctime = time(NULL);
1401 +    head->ctime = GUINT64_TO_BE(ctime);
1402 +
1403 +    if (!vmaw->stream_count) {
1404 +        return -1;
1405 +    }
1406 +
1407 +    for (i = 0; i < VMA_MAX_CONFIGS; i++) {
1408 +        head->config_names[i] = GUINT32_TO_BE(vmaw->config_names[i]);
1409 +        head->config_data[i] = GUINT32_TO_BE(vmaw->config_data[i]);
1410 +    }
1411 +
1412 +    /* 32 bytes per device (12 used currently) = 8192 bytes max */
1413 +    for (i = 1; i <= 254; i++) {
1414 +        VmaStreamInfo *si = &vmaw->stream_info[i];
1415 +        if (si->size) {
1416 +            assert(si->devname);
1417 +            uint32_t devname_ptr = allocate_header_string(vmaw, si->devname);
1418 +            if (!devname_ptr) {
1419 +                return -1;
1420 +            }
1421 +            head->dev_info[i].devname_ptr = GUINT32_TO_BE(devname_ptr);
1422 +            head->dev_info[i].size = GUINT64_TO_BE(si->size);
1423 +        }
1424 +    }
1425 +
1426 +    uint32_t header_size = sizeof(VmaHeader) + vmaw->header_blob_table_size;
1427 +    head->header_size = GUINT32_TO_BE(header_size);
1428 +
1429 +    if (header_size > sizeof(buf)) {
1430 +        return -1; /* just to be sure */
1431 +    }
1432 +
1433 +    uint32_t blob_buffer_offset = sizeof(VmaHeader);
1434 +    memcpy(buf + blob_buffer_offset, vmaw->header_blob_table,
1435 +           vmaw->header_blob_table_size);
1436 +    head->blob_buffer_offset = GUINT32_TO_BE(blob_buffer_offset);
1437 +    head->blob_buffer_size = GUINT32_TO_BE(vmaw->header_blob_table_pos);
1438 +
1439 +    g_checksum_reset(vmaw->md5csum);
1440 +    g_checksum_update(vmaw->md5csum, (const guchar *)buf, header_size);
1441 +    gsize csize = 16;
1442 +    g_checksum_get_digest(vmaw->md5csum, (guint8 *)(head->md5sum), &csize);
1443 +
1444 +    return vma_queue_write(vmaw, buf, header_size);
1445 +}
1446 +
1447 +static int coroutine_fn vma_writer_flush(VmaWriter *vmaw)
1448 +{
1449 +    assert(vmaw);
1450 +
1451 +    int ret;
1452 +    int i;
1453 +
1454 +    if (vmaw->status < 0) {
1455 +        return vmaw->status;
1456 +    }
1457 +
1458 +    if (!vmaw->header_written) {
1459 +        vmaw->header_written = true;
1460 +        ret = vma_write_header(vmaw);
1461 +        if (ret < 0) {
1462 +            vma_writer_set_error(vmaw, "vma_writer_flush: write header failed");
1463 +            return ret;
1464 +        }
1465 +    }
1466 +
1467 +    DPRINTF("VMA WRITE FLUSH %d %d\n", vmaw->outbuf_count, vmaw->outbuf_pos);
1468 +
1469 +
1470 +    VmaExtentHeader *ehead = (VmaExtentHeader *)vmaw->outbuf;
1471 +
1472 +    ehead->magic = VMA_EXTENT_MAGIC;
1473 +    ehead->reserved1 = 0;
1474 +
1475 +    for (i = 0; i < VMA_BLOCKS_PER_EXTENT; i++) {
1476 +        ehead->blockinfo[i] = GUINT64_TO_BE(vmaw->outbuf_block_info[i]);
1477 +    }
1478 +
1479 +    guint16 block_count = (vmaw->outbuf_pos - VMA_EXTENT_HEADER_SIZE) /
1480 +        VMA_BLOCK_SIZE;
1481 +
1482 +    ehead->block_count = GUINT16_TO_BE(block_count);
1483 +
1484 +    memcpy(ehead->uuid, vmaw->uuid, sizeof(ehead->uuid));
1485 +    memset(ehead->md5sum, 0, sizeof(ehead->md5sum));
1486 +
1487 +    g_checksum_reset(vmaw->md5csum);
1488 +    g_checksum_update(vmaw->md5csum, vmaw->outbuf, VMA_EXTENT_HEADER_SIZE);
1489 +    gsize csize = 16;
1490 +    g_checksum_get_digest(vmaw->md5csum, ehead->md5sum, &csize);
1491 +
1492 +    int bytes = vmaw->outbuf_pos;
1493 +    ret = vma_queue_write(vmaw, vmaw->outbuf, bytes);
1494 +    if (ret != bytes) {
1495 +        vma_writer_set_error(vmaw, "vma_writer_flush: failed write");
1496 +    }
1497 +
1498 +    vmaw->outbuf_count = 0;
1499 +    vmaw->outbuf_pos = VMA_EXTENT_HEADER_SIZE;
1500 +
1501 +    for (i = 0; i < VMA_BLOCKS_PER_EXTENT; i++) {
1502 +        vmaw->outbuf_block_info[i] = 0;
1503 +    }
1504 +
1505 +    return vmaw->status;
1506 +}
1507 +
1508 +static int vma_count_open_streams(VmaWriter *vmaw)
1509 +{
1510 +    g_assert(vmaw != NULL);
1511 +
1512 +    int i;
1513 +    int open_drives = 0;
1514 +    for (i = 0; i <= 255; i++) {
1515 +        if (vmaw->stream_info[i].size && !vmaw->stream_info[i].finished) {
1516 +            open_drives++;
1517 +        }
1518 +    }
1519 +
1520 +    return open_drives;
1521 +}
1522 +
1523 +/**
1524 + * all jobs should call this when there is no more data
1525 + * Returns: number of remaining stream (0 ==> finished)
1526 + */
1527 +int coroutine_fn
1528 +vma_writer_close_stream(VmaWriter *vmaw, uint8_t dev_id)
1529 +{
1530 +    g_assert(vmaw != NULL);
1531 +
1532 +    DPRINTF("vma_writer_set_status %d\n", dev_id);
1533 +    if (!vmaw->stream_info[dev_id].size) {
1534 +        vma_writer_set_error(vmaw, "vma_writer_close_stream: "
1535 +                             "no such stream %d", dev_id);
1536 +        return -1;
1537 +    }
1538 +    if (vmaw->stream_info[dev_id].finished) {
1539 +        vma_writer_set_error(vmaw, "vma_writer_close_stream: "
1540 +                             "stream already closed %d", dev_id);
1541 +        return -1;
1542 +    }
1543 +
1544 +    vmaw->stream_info[dev_id].finished = true;
1545 +
1546 +    int open_drives = vma_count_open_streams(vmaw);
1547 +
1548 +    if (open_drives <= 0) {
1549 +        DPRINTF("vma_writer_set_status all drives completed\n");
1550 +        qemu_co_mutex_lock(&vmaw->flush_lock);
1551 +        int ret = vma_writer_flush(vmaw);
1552 +        qemu_co_mutex_unlock(&vmaw->flush_lock);
1553 +        if (ret < 0) {
1554 +            vma_writer_set_error(vmaw, "vma_writer_close_stream: flush failed");
1555 +        }
1556 +    }
1557 +
1558 +    return open_drives;
1559 +}
1560 +
1561 +int vma_writer_get_status(VmaWriter *vmaw, VmaStatus *status)
1562 +{
1563 +    int i;
1564 +
1565 +    g_assert(vmaw != NULL);
1566 +
1567 +    if (status) {
1568 +        status->status = vmaw->status;
1569 +        g_strlcpy(status->errmsg, vmaw->errmsg, sizeof(status->errmsg));
1570 +        for (i = 0; i <= 255; i++) {
1571 +            status->stream_info[i] = vmaw->stream_info[i];
1572 +        }
1573 +
1574 +        uuid_unparse_lower(vmaw->uuid, status->uuid_str);
1575 +    }
1576 +
1577 +    status->closed = vmaw->closed;
1578 +
1579 +    return vmaw->status;
1580 +}
1581 +
1582 +static int vma_writer_get_buffer(VmaWriter *vmaw)
1583 +{
1584 +
1585 +    /* wait until buffer is available */
1586 +    while (vmaw->outbuf_count >= (VMA_BLOCKS_PER_EXTENT - 1)) {
1587 +        int res = 0;
1588 +
1589 +        qemu_co_mutex_lock(&vmaw->flush_lock);
1590 +        res = vma_writer_flush(vmaw);
1591 +        qemu_co_mutex_unlock(&vmaw->flush_lock);
1592 +
1593 +        if (res < 0) {
1594 +            vma_writer_set_error(vmaw, "vma_writer_get_buffer: flush failed");
1595 +            return -1;
1596 +        }
1597 +    }
1598 +
1599 +    return 0;
1600 +}
1601 +
1602 +
1603 +int64_t coroutine_fn
1604 +vma_writer_write(VmaWriter *vmaw, uint8_t dev_id, int64_t cluster_num,
1605 +                 unsigned char *buf, size_t *zero_bytes)
1606 +{
1607 +    g_assert(vmaw != NULL);
1608 +    g_assert(zero_bytes != NULL);
1609 +
1610 +    *zero_bytes = 0;
1611 +
1612 +    if (vmaw->status < 0) {
1613 +        return vmaw->status;
1614 +    }
1615 +
1616 +    if (!dev_id || !vmaw->stream_info[dev_id].size) {
1617 +        vma_writer_set_error(vmaw, "vma_writer_write: "
1618 +                             "no such stream %d", dev_id);
1619 +        return -1;
1620 +    }
1621 +
1622 +    if (vmaw->stream_info[dev_id].finished) {
1623 +        vma_writer_set_error(vmaw, "vma_writer_write: "
1624 +                             "stream already closed %d", dev_id);
1625 +        return -1;
1626 +    }
1627 +
1628 +
1629 +    if (cluster_num >= (((uint64_t)1)<<32)) {
1630 +        vma_writer_set_error(vmaw, "vma_writer_write: "
1631 +                             "cluster number out of range");
1632 +        return -1;
1633 +    }
1634 +
1635 +    if (dev_id == vmaw->vmstate_stream) {
1636 +        if (cluster_num != vmaw->vmstate_clusters) {
1637 +            vma_writer_set_error(vmaw, "vma_writer_write: "
1638 +                                 "non sequential vmstate write");
1639 +        }
1640 +        vmaw->vmstate_clusters++;
1641 +    } else if (cluster_num >= vmaw->stream_info[dev_id].cluster_count) {
1642 +        vma_writer_set_error(vmaw, "vma_writer_write: cluster number too big");
1643 +        return -1;
1644 +    }
1645 +
1646 +    /* wait until buffer is available */
1647 +    if (vma_writer_get_buffer(vmaw) < 0) {
1648 +        vma_writer_set_error(vmaw, "vma_writer_write: "
1649 +                             "vma_writer_get_buffer failed");
1650 +        return -1;
1651 +    }
1652 +
1653 +    DPRINTF("VMA WRITE %zd\n", cluster_num);
1654 +
1655 +    int i;
1656 +    int bit = 1;
1657 +    uint16_t mask = 0;
1658 +    for (i = 0; i < 16; i++) {
1659 +        unsigned char *vmablock = buf + (i*VMA_BLOCK_SIZE);
1660 +        if (buffer_is_zero(vmablock, VMA_BLOCK_SIZE)) {
1661 +            DPRINTF("VMA WRITE %zd ZERO BLOCK %d\n", cluster_num, i);
1662 +            vmaw->stream_info[dev_id].zero_bytes += VMA_BLOCK_SIZE;
1663 +            *zero_bytes += VMA_BLOCK_SIZE;
1664 +        } else {
1665 +            mask |= bit;
1666 +            memcpy(vmaw->outbuf + vmaw->outbuf_pos, vmablock, VMA_BLOCK_SIZE);
1667 +            vmaw->outbuf_pos += VMA_BLOCK_SIZE;
1668 +
1669 +            vmaw->delay_ns = ratelimit_calculate_delay(&vmaw->limit,
1670 +                                                       VMA_BLOCK_SIZE);
1671 +            if (vmaw->delay_ns) {
1672 +                co_sleep_ns(rt_clock, vmaw->delay_ns);
1673 +            }
1674 +        }
1675 +
1676 +        bit = bit << 1;
1677 +    }
1678 +
1679 +    uint64_t block_info = ((uint64_t)mask) << (32+16);
1680 +    block_info |= ((uint64_t)dev_id) << 32;
1681 +    block_info |= (cluster_num & 0xffffffff);
1682 +    vmaw->outbuf_block_info[vmaw->outbuf_count] =  block_info;
1683 +
1684 +    DPRINTF("VMA WRITE MASK %zd %zx\n", cluster_num, block_info);
1685 +
1686 +    vmaw->outbuf_count++;
1687 +
1688 +    /** NOTE: We allways write whole clusters, but we correctly set
1689 +     * transferred bytes. So transferred == size when when everything
1690 +     * went OK.
1691 +     */
1692 +    size_t transferred = VMA_CLUSTER_SIZE;
1693 +
1694 +    if (dev_id != vmaw->vmstate_stream) {
1695 +        uint64_t last = (cluster_num + 1) * VMA_CLUSTER_SIZE;
1696 +        if (last > vmaw->stream_info[dev_id].size) {
1697 +            uint64_t diff = last - vmaw->stream_info[dev_id].size;
1698 +            if (diff >= VMA_CLUSTER_SIZE) {
1699 +                vma_writer_set_error(vmaw, "vma_writer_write: "
1700 +                                     "read after last cluster");
1701 +                return -1;
1702 +            }
1703 +            transferred -= diff;
1704 +        }
1705 +    }
1706 +
1707 +    vmaw->stream_info[dev_id].transferred += transferred;
1708 +
1709 +    return transferred;
1710 +}
1711 +
1712 +int vma_writer_close(VmaWriter *vmaw, Error **errp)
1713 +{
1714 +    g_assert(vmaw != NULL);
1715 +
1716 +    int i;
1717 +
1718 +    vma_queue_flush(vmaw);
1719 +
1720 +    /* this should not happen - just to be sure */
1721 +    while (!qemu_co_queue_empty(&vmaw->wqueue)) {
1722 +        DPRINTF("vma_writer_close wait\n");
1723 +        co_sleep_ns(rt_clock, 1000000);
1724 +    }
1725 +
1726 +    if (vmaw->cmd) {
1727 +        if (pclose(vmaw->cmd) < 0) {
1728 +            vma_writer_set_error(vmaw, "vma_writer_close: "
1729 +                                 "pclose failed - %s", strerror(errno));
1730 +        }
1731 +    } else {
1732 +        if (close(vmaw->fd) < 0) {
1733 +            vma_writer_set_error(vmaw, "vma_writer_close: "
1734 +                                 "close failed - %s", strerror(errno));
1735 +        }
1736 +    }
1737 +
1738 +    for (i = 0; i <= 255; i++) {
1739 +        VmaStreamInfo *si = &vmaw->stream_info[i];
1740 +        if (si->size) {
1741 +            if (!si->finished) {
1742 +                vma_writer_set_error(vmaw, "vma_writer_close: "
1743 +                                     "detected open stream '%s'", si->devname);
1744 +            } else if ((si->transferred != si->size) &&
1745 +                       (i != vmaw->vmstate_stream)) {
1746 +                vma_writer_set_error(vmaw, "vma_writer_close: "
1747 +                                     "incomplete stream '%s' (%zd != %zd)",
1748 +                                     si->devname, si->transferred, si->size);
1749 +            }
1750 +        }
1751 +    }
1752 +
1753 +    for (i = 0; i <= 255; i++) {
1754 +        vmaw->stream_info[i].finished = 1; /* mark as closed */
1755 +    }
1756 +
1757 +    vmaw->closed = 1;
1758 +
1759 +    if (vmaw->status < 0 && *errp == NULL) {
1760 +        error_setg(errp, "%s", vmaw->errmsg);
1761 +    }
1762 +
1763 +    return vmaw->status;
1764 +}
1765 +
1766 +void vma_writer_destroy(VmaWriter *vmaw)
1767 +{
1768 +    assert(vmaw);
1769 +
1770 +    int i;
1771 +
1772 +    for (i = 0; i <= 255; i++) {
1773 +        if (vmaw->stream_info[i].devname) {
1774 +            g_free(vmaw->stream_info[i].devname);
1775 +        }
1776 +    }
1777 +
1778 +    if (vmaw->md5csum) {
1779 +        g_checksum_free(vmaw->md5csum);
1780 +    }
1781 +
1782 +    g_free(vmaw);
1783 +}
1784 +
1785 +/* backup driver plugin */
1786 +
1787 +static int vma_dump_cb(void *opaque, uint8_t dev_id, int64_t cluster_num,
1788 +                       unsigned char *buf, size_t *zero_bytes)
1789 +{
1790 +    VmaWriter *vmaw = opaque;
1791 +
1792 +    return vma_writer_write(vmaw, dev_id, cluster_num, buf, zero_bytes);
1793 +}
1794 +
1795 +static int vma_close_cb(void *opaque, Error **errp)
1796 +{
1797 +    VmaWriter *vmaw = opaque;
1798 +
1799 +    int res = vma_writer_close(vmaw, errp);
1800 +    vma_writer_destroy(vmaw);
1801 +
1802 +    return res;
1803 +}
1804 +
1805 +static int vma_complete_cb(void *opaque, uint8_t dev_id, int ret)
1806 +{
1807 +    VmaWriter *vmaw = opaque;
1808 +
1809 +    if (ret < 0) {
1810 +        vma_writer_set_error(vmaw, "backup_complete_cb %d", ret);
1811 +    }
1812 +
1813 +    return vma_writer_close_stream(vmaw, dev_id);
1814 +}
1815 +
1816 +static int vma_register_stream_cb(void *opaque, const char *devname,
1817 +                                  size_t size)
1818 +{
1819 +    VmaWriter *vmaw = opaque;
1820 +
1821 +    return vma_writer_register_stream(vmaw, devname, size);
1822 +}
1823 +
1824 +static int vma_register_config_cb(void *opaque, const char *name,
1825 +                                  gpointer data, size_t data_len)
1826 +{
1827 +    VmaWriter *vmaw = opaque;
1828 +
1829 +    return vma_writer_add_config(vmaw, name, data, data_len);
1830 +}
1831 +
1832 +static void *vma_open_cb(const char *filename, uuid_t uuid, int64_t speed,
1833 +                         Error **errp)
1834 +{
1835 +    return vma_writer_create(filename, uuid, speed, errp);
1836 +}
1837 +
1838 +const BackupDriver backup_vma_driver = {
1839 +    .format = "vma",
1840 +    .open_cb = vma_open_cb,
1841 +    .close_cb = vma_close_cb,
1842 +    .register_config_cb = vma_register_config_cb,
1843 +    .register_stream_cb = vma_register_stream_cb,
1844 +    .dump_cb = vma_dump_cb,
1845 +    .complete_cb = vma_complete_cb,
1846 +};
1847 +
1848 diff --git a/vma.c b/vma.c
1849 new file mode 100644
1850 index 0000000..d50a312
1851 --- /dev/null
1852 +++ b/vma.c
1853 @@ -0,0 +1,558 @@
1854 +/*
1855 + * VMA: Virtual Machine Archive
1856 + *
1857 + * Copyright (C) 2012 Proxmox Server Solutions
1858 + *
1859 + * Authors:
1860 + *  Dietmar Maurer (dietmar@proxmox.com)
1861 + *
1862 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
1863 + * See the COPYING file in the top-level directory.
1864 + *
1865 + */
1866 +
1867 +#include <stdio.h>
1868 +#include <errno.h>
1869 +#include <unistd.h>
1870 +#include <stdio.h>
1871 +#include <string.h>
1872 +#include <sys/types.h>
1873 +#include <sys/stat.h>
1874 +#include <fcntl.h>
1875 +#include <glib.h>
1876 +
1877 +#include "qemu-common.h"
1878 +#include "qemu-option.h"
1879 +#include "qemu-error.h"
1880 +#include "osdep.h"
1881 +#include "sysemu.h"
1882 +#include "block_int.h"
1883 +#include <stdio.h>
1884 +#include "vma.h"
1885 +
1886 +static void help(void)
1887 +{
1888 +    const char *help_msg =
1889 +        "usage: vma command [command options]\n"
1890 +        "\n"
1891 +        "vma list <filename>\n"
1892 +        "vma create <filename> [-c config] <archive> pathname ...\n"
1893 +        "vma extract <filename> [-r] <targetdir>\n"
1894 +        ;
1895 +
1896 +    printf("%s", help_msg);
1897 +    exit(1);
1898 +}
1899 +
1900 +static const char *extract_devname(const char *path, char **devname, int index)
1901 +{
1902 +    assert(path);
1903 +
1904 +    const char *sep = strchr(path, '=');
1905 +
1906 +    if (sep) {
1907 +        *devname = g_strndup(path, sep - path);
1908 +        path = sep + 1;
1909 +    } else {
1910 +        if (index >= 0) {
1911 +            *devname = g_strdup_printf("disk%d", index);
1912 +        } else {
1913 +            *devname = NULL;
1914 +        }
1915 +    }
1916 +
1917 +    return path;
1918 +}
1919 +
1920 +static void print_content(VmaReader *vmar)
1921 +{
1922 +    assert(vmar);
1923 +
1924 +    VmaHeader *head = vma_reader_get_header(vmar);
1925 +
1926 +    GList *l = vma_reader_get_config_data(vmar);
1927 +    while (l && l->data) {
1928 +        VmaConfigData *cdata = (VmaConfigData *)l->data;
1929 +        l = g_list_next(l);
1930 +        printf("CFG: size: %d name: %s\n", cdata->len, cdata->name);
1931 +    }
1932 +
1933 +    int i;
1934 +    VmaDeviceInfo *di;
1935 +    for (i = 1; i < 255; i++) {
1936 +        di = vma_reader_get_device_info(vmar, i);
1937 +        if (di) {
1938 +            if (strcmp(di->devname, "vmstate") == 0) {
1939 +                printf("VMSTATE: dev_id=%d memory: %zd\n", i, di->size);
1940 +            } else {
1941 +                printf("DEV: dev_id=%d size: %zd devname: %s\n",
1942 +                       i, di->size, di->devname);
1943 +            }
1944 +        }
1945 +    }
1946 +    /* ctime is the last entry we print */
1947 +    printf("CTIME: %s", ctime(&head->ctime));
1948 +    fflush(stdout);
1949 +}
1950 +
1951 +static int list_content(int argc, char **argv)
1952 +{
1953 +    int c, ret = 0;
1954 +    const char *filename;
1955 +
1956 +    for (;;) {
1957 +        c = getopt(argc, argv, "h");
1958 +        if (c == -1) {
1959 +            break;
1960 +        }
1961 +        switch (c) {
1962 +        case '?':
1963 +        case 'h':
1964 +            help();
1965 +            break;
1966 +        default:
1967 +            g_assert_not_reached();
1968 +        }
1969 +    }
1970 +
1971 +    /* Get the filename */
1972 +    if ((optind + 1) != argc) {
1973 +        help();
1974 +    }
1975 +    filename = argv[optind++];
1976 +
1977 +    Error *errp = NULL;
1978 +    VmaReader *vmar = vma_reader_create(filename, &errp);
1979 +
1980 +    if (!vmar) {
1981 +        g_error("%s", error_get_pretty(errp));
1982 +    }
1983 +
1984 +    print_content(vmar);
1985 +
1986 +    vma_reader_destroy(vmar);
1987 +
1988 +    return ret;
1989 +}
1990 +
1991 +typedef struct RestoreMap {
1992 +    char *devname;
1993 +    char *path;
1994 +    bool write_zero;
1995 +} RestoreMap;
1996 +
1997 +static int extract_content(int argc, char **argv)
1998 +{
1999 +    int c, ret = 0;
2000 +    int verbose = 0;
2001 +    const char *filename;
2002 +    const char *dirname;
2003 +    const char *readmap = NULL;
2004 +
2005 +    for (;;) {
2006 +        c = getopt(argc, argv, "hvr:");
2007 +        if (c == -1) {
2008 +            break;
2009 +        }
2010 +        switch (c) {
2011 +        case '?':
2012 +        case 'h':
2013 +            help();
2014 +            break;
2015 +        case 'r':
2016 +            readmap = optarg;
2017 +            break;
2018 +       case 'v':
2019 +            verbose = 1;
2020 +            break;
2021 +        default:
2022 +            help();
2023 +        }
2024 +    }
2025 +
2026 +    /* Get the filename */
2027 +    if ((optind + 2) != argc) {
2028 +        help();
2029 +    }
2030 +    filename = argv[optind++];
2031 +    dirname = argv[optind++];
2032 +
2033 +    Error *errp = NULL;
2034 +    VmaReader *vmar = vma_reader_create(filename, &errp);
2035 +
2036 +    if (!vmar) {
2037 +        g_error("%s", error_get_pretty(errp));
2038 +    }
2039 +
2040 +    if (mkdir(dirname, 0777) < 0) {
2041 +        g_error("unable to create target directory %s - %s",
2042 +                dirname, strerror(errno));
2043 +    }
2044 +
2045 +    GList *l = vma_reader_get_config_data(vmar);
2046 +    while (l && l->data) {
2047 +        VmaConfigData *cdata = (VmaConfigData *)l->data;
2048 +        l = g_list_next(l);
2049 +        char *cfgfn = g_strdup_printf("%s/%s", dirname, cdata->name);
2050 +        GError *err = NULL;
2051 +        if (!g_file_set_contents(cfgfn, (gchar *)cdata->data, cdata->len,
2052 +                                 &err)) {
2053 +            g_error("unable to write file: %s", err->message);
2054 +        }
2055 +    }
2056 +
2057 +    GHashTable *devmap = g_hash_table_new(g_str_hash, g_str_equal);
2058 +
2059 +    if (readmap) {
2060 +        print_content(vmar);
2061 +
2062 +        FILE *map = fopen(readmap, "r");
2063 +        if (!map) {
2064 +            g_error("unable to open fifo %s - %s", readmap, strerror(errno));
2065 +        }
2066 +
2067 +        while (1) {
2068 +            char inbuf[8192];
2069 +            char *line = fgets(inbuf, sizeof(inbuf), map);
2070 +            if (!line || line[0] == '\0' || !strcmp(line, "done\n")) {
2071 +                break;
2072 +            }
2073 +            int len = strlen(line);
2074 +            if (line[len - 1] == '\n') {
2075 +                line[len - 1] = '\0';
2076 +                if (len == 1) {
2077 +                    break;
2078 +                }
2079 +            }
2080 +
2081 +            const char *path;
2082 +            bool write_zero;
2083 +            if (line[0] == '0' && line[1] == ':') {
2084 +                path = inbuf + 2;
2085 +                write_zero = false;
2086 +            } else if (line[0] == '1' && line[1] == ':') {
2087 +                path = inbuf + 2;
2088 +                write_zero = true;
2089 +            } else {
2090 +                g_error("read map failed - parse error ('%s')", inbuf);
2091 +            }
2092 +
2093 +            char *devname = NULL;
2094 +            path = extract_devname(path, &devname, -1);
2095 +            if (!devname) {
2096 +                g_error("read map failed - no dev name specified ('%s')",
2097 +                        inbuf);
2098 +            }
2099 +
2100 +            RestoreMap *map = g_new0(RestoreMap, 1);
2101 +            map->devname = g_strdup(devname);
2102 +            map->path = g_strdup(path);
2103 +            map->write_zero = write_zero;
2104 +
2105 +            g_hash_table_insert(devmap, map->devname, map);
2106 +
2107 +        };
2108 +    }
2109 +
2110 +    int i;
2111 +    int vmstate_fd = -1;
2112 +    guint8 vmstate_stream = 0;
2113 +
2114 +    for (i = 1; i < 255; i++) {
2115 +        VmaDeviceInfo *di = vma_reader_get_device_info(vmar, i);
2116 +        if (di && (strcmp(di->devname, "vmstate") == 0)) {
2117 +            vmstate_stream = i;
2118 +            char *statefn = g_strdup_printf("%s/vmstate.bin", dirname);
2119 +            vmstate_fd = open(statefn, O_WRONLY|O_CREAT|O_EXCL, 0644);
2120 +            if (vmstate_fd < 0) {
2121 +                g_error("create vmstate file '%s' failed - %s", statefn,
2122 +                        strerror(errno));
2123 +            }
2124 +            g_free(statefn);
2125 +        } else if (di) {
2126 +            char *devfn = NULL;
2127 +            int flags = BDRV_O_RDWR|BDRV_O_CACHE_WB;
2128 +            bool write_zero = true;
2129 +
2130 +            if (readmap) {
2131 +                RestoreMap *map;
2132 +                map = (RestoreMap *)g_hash_table_lookup(devmap, di->devname);
2133 +                if (map == NULL) {
2134 +                    g_error("no device name mapping for %s", di->devname);
2135 +                }
2136 +                devfn = map->path;
2137 +                write_zero = map->write_zero;
2138 +            } else {
2139 +                devfn = g_strdup_printf("%s/tmp-disk-%s.raw",
2140 +                                        dirname, di->devname);
2141 +                printf("DEVINFO %s %zd\n", devfn, di->size);
2142 +
2143 +                if (bdrv_img_create(devfn, "raw", NULL, NULL, NULL,
2144 +                                    di->size, flags)) {
2145 +                    g_error("can't create file %s", devfn);
2146 +                }
2147 +
2148 +                /* Note: we created an empty file above, so there is no
2149 +                 * need to write zeroes (so we generate a sparse file)
2150 +                 */
2151 +                write_zero = false;
2152 +            }
2153 +
2154 +            BlockDriverState *bs = bdrv_new(di->devname);
2155 +            if (bdrv_open(bs, devfn, flags, NULL)) {
2156 +                g_error("can't open file %s", devfn);
2157 +            }
2158 +            if (vma_reader_register_bs(vmar, i, bs, write_zero, &errp) < 0) {
2159 +                g_error("%s", error_get_pretty(errp));
2160 +            }
2161 +
2162 +            if (!readmap) {
2163 +                g_free(devfn);
2164 +            }
2165 +        }
2166 +    }
2167 +
2168 +    if (vma_reader_restore(vmar, vmstate_fd, verbose, &errp) < 0) {
2169 +        g_error("restore failed - %s", error_get_pretty(errp));
2170 +    }
2171 +
2172 +    if (!readmap) {
2173 +        for (i = 1; i < 255; i++) {
2174 +            VmaDeviceInfo *di = vma_reader_get_device_info(vmar, i);
2175 +            if (di && (i != vmstate_stream)) {
2176 +                char *tmpfn = g_strdup_printf("%s/tmp-disk-%s.raw",
2177 +                                              dirname, di->devname);
2178 +                char *fn = g_strdup_printf("%s/disk-%s.raw",
2179 +                                           dirname, di->devname);
2180 +                if (rename(tmpfn, fn) != 0) {
2181 +                    g_error("rename %s to %s failed - %s",
2182 +                            tmpfn, fn, strerror(errno));
2183 +                }
2184 +            }
2185 +        }
2186 +    }
2187 +
2188 +    vma_reader_destroy(vmar);
2189 +
2190 +    bdrv_close_all();
2191 +
2192 +    return ret;
2193 +}
2194 +
2195 +typedef struct BackupCB {
2196 +    VmaWriter *vmaw;
2197 +    uint8_t dev_id;
2198 +} BackupCB;
2199 +
2200 +static int backup_dump_cb(void *opaque, BlockDriverState *bs,
2201 +                          int64_t cluster_num, unsigned char *buf)
2202 +{
2203 +    BackupCB *bcb = opaque;
2204 +    size_t zb = 0;
2205 +    if (vma_writer_write(bcb->vmaw, bcb->dev_id, cluster_num, buf, &zb) < 0) {
2206 +        g_warning("backup_dump_cb vma_writer_write failed");
2207 +        return -1;
2208 +    }
2209 +
2210 +    return 0;
2211 +}
2212 +
2213 +static void backup_complete_cb(void *opaque, int ret)
2214 +{
2215 +    BackupCB *bcb = opaque;
2216 +
2217 +    if (ret < 0) {
2218 +        vma_writer_set_error(bcb->vmaw, "backup_complete_cb %d", ret);
2219 +    }
2220 +
2221 +    if (vma_writer_close_stream(bcb->vmaw, bcb->dev_id) <= 0) {
2222 +        Error *err = NULL;
2223 +        if (vma_writer_close(bcb->vmaw, &err) != 0) {
2224 +            g_warning("vma_writer_close failed %s", error_get_pretty(err));
2225 +        }
2226 +    }
2227 +}
2228 +
2229 +static int create_archive(int argc, char **argv)
2230 +{
2231 +    int i, c, res;
2232 +    int verbose = 0;
2233 +    const char *archivename;
2234 +    GList *config_files = NULL;
2235 +
2236 +    for (;;) {
2237 +        c = getopt(argc, argv, "hvc:");
2238 +        if (c == -1) {
2239 +            break;
2240 +        }
2241 +        switch (c) {
2242 +        case '?':
2243 +        case 'h':
2244 +            help();
2245 +            break;
2246 +        case 'c':
2247 +            config_files = g_list_append(config_files, optarg);
2248 +            break;
2249 +        case 'v':
2250 +            verbose = 1;
2251 +            break;
2252 +        default:
2253 +            g_assert_not_reached();
2254 +        }
2255 +    }
2256 +
2257 +
2258 +    /* make sure we have archive name and at least one path */
2259 +    if ((optind + 2) > argc) {
2260 +        help();
2261 +    }
2262 +
2263 +    archivename = argv[optind++];
2264 +
2265 +    uuid_t uuid;
2266 +    uuid_generate(uuid);
2267 +
2268 +    Error *local_err = NULL;
2269 +    VmaWriter *vmaw = vma_writer_create(archivename, uuid, 0, &local_err);
2270 +
2271 +    if (vmaw == NULL) {
2272 +        g_error("%s", error_get_pretty(local_err));
2273 +    }
2274 +
2275 +    GList *l = config_files;
2276 +    while (l && l->data) {
2277 +        char *name = l->data;
2278 +        char *cdata = NULL;
2279 +        gsize clen = 0;
2280 +        GError *err = NULL;
2281 +        if (!g_file_get_contents(name, &cdata, &clen, &err)) {
2282 +            unlink(archivename);
2283 +            g_error("Unable to read file: %s", err->message);
2284 +        }
2285 +
2286 +        if (vma_writer_add_config(vmaw, name, cdata, clen) != 0) {
2287 +            unlink(archivename);
2288 +            g_error("Unable to append config data %s (len = %zd)",
2289 +                    name, clen);
2290 +        }
2291 +        l = g_list_next(l);
2292 +    }
2293 +
2294 +    int ind = 0;
2295 +    while (optind < argc) {
2296 +        const char *path = argv[optind++];
2297 +        char *devname = NULL;
2298 +        path = extract_devname(path, &devname, ind++);
2299 +
2300 +        BlockDriver *drv = NULL;
2301 +        BlockDriverState *bs = bdrv_new(devname);
2302 +
2303 +        res = bdrv_open(bs, path, BDRV_O_CACHE_WB , drv);
2304 +        if (res < 0) {
2305 +            unlink(archivename);
2306 +            g_error("bdrv_open '%s' failed", path);
2307 +        }
2308 +        int64_t size = bdrv_getlength(bs);
2309 +        int dev_id = vma_writer_register_stream(vmaw, devname, size);
2310 +        if (dev_id <= 0) {
2311 +            unlink(archivename);
2312 +            g_error("vma_writer_register_stream '%s' failed", devname);
2313 +        }
2314 +
2315 +        BackupCB *bcb = g_new0(BackupCB, 1);
2316 +        bcb->vmaw = vmaw;
2317 +        bcb->dev_id = dev_id;
2318 +
2319 +        if (backup_job_start(bs, backup_dump_cb, backup_complete_cb, bcb) < 0) {
2320 +            unlink(archivename);
2321 +            g_error("backup_job_start failed");
2322 +        }
2323 +    }
2324 +
2325 +    VmaStatus vmastat;
2326 +    int percent = 0;
2327 +    int last_percent = -1;
2328 +
2329 +    while (1) {
2330 +        main_loop_wait(false);
2331 +        vma_writer_get_status(vmaw, &vmastat);
2332 +
2333 +        if (verbose) {
2334 +
2335 +            uint64_t total = 0;
2336 +            uint64_t transferred = 0;
2337 +            uint64_t zero_bytes = 0;
2338 +
2339 +            int i;
2340 +            for (i = 0; i < 256; i++) {
2341 +                if (vmastat.stream_info[i].size) {
2342 +                    total += vmastat.stream_info[i].size;
2343 +                    transferred += vmastat.stream_info[i].transferred;
2344 +                    zero_bytes += vmastat.stream_info[i].zero_bytes;
2345 +                }
2346 +            }
2347 +            percent = (transferred*100)/total;
2348 +            if (percent != last_percent) {
2349 +                printf("progress %d%% %zd/%zd %zd\n", percent,
2350 +                       transferred, total, zero_bytes);
2351 +
2352 +                last_percent = percent;
2353 +            }
2354 +        }
2355 +
2356 +        if (vmastat.closed) {
2357 +            break;
2358 +        }
2359 +    }
2360 +
2361 +    bdrv_drain_all();
2362 +
2363 +    vma_writer_get_status(vmaw, &vmastat);
2364 +
2365 +    if (verbose) {
2366 +        for (i = 0; i < 256; i++) {
2367 +            VmaStreamInfo *si = &vmastat.stream_info[i];
2368 +            if (si->size) {
2369 +                printf("image %s: size=%zd zeros=%zd saved=%zd\n", si->devname,
2370 +                       si->size, si->zero_bytes, si->size - si->zero_bytes);
2371 +            }
2372 +        }
2373 +    }
2374 +
2375 +    if (vmastat.status < 0) {
2376 +        unlink(archivename);
2377 +        g_error("creating vma archive failed");
2378 +    }
2379 +
2380 +    return 0;
2381 +}
2382 +
2383 +int main(int argc, char **argv)
2384 +{
2385 +    const char *cmdname;
2386 +
2387 +    error_set_progname(argv[0]);
2388 +
2389 +    qemu_init_main_loop();
2390 +
2391 +    bdrv_init();
2392 +
2393 +    if (argc < 2) {
2394 +        help();
2395 +    }
2396 +
2397 +    cmdname = argv[1];
2398 +    argc--; argv++;
2399 +
2400 +
2401 +    if (!strcmp(cmdname, "list")) {
2402 +        return list_content(argc, argv);
2403 +    } else if (!strcmp(cmdname, "create")) {
2404 +        return create_archive(argc, argv);
2405 +    } else if (!strcmp(cmdname, "extract")) {
2406 +        return extract_content(argc, argv);
2407 +    }
2408 +
2409 +    help();
2410 +    return 0;
2411 +}
2412 diff --git a/vma.h b/vma.h
2413 new file mode 100644
2414 index 0000000..f30a2bc
2415 --- /dev/null
2416 +++ b/vma.h
2417 @@ -0,0 +1,146 @@
2418 +/*
2419 + * VMA: Virtual Machine Archive
2420 + *
2421 + * Copyright (C) Proxmox Server Solutions
2422 + *
2423 + * Authors:
2424 + *  Dietmar Maurer (dietmar@proxmox.com)
2425 + *
2426 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
2427 + * See the COPYING file in the top-level directory.
2428 + *
2429 + */
2430 +
2431 +#ifndef BACKUP_VMA_H
2432 +#define BACKUP_VMA_H
2433 +
2434 +#include "backup.h"
2435 +#include "error.h"
2436 +
2437 +#define VMA_BLOCK_BITS 12
2438 +#define VMA_BLOCK_SIZE (1<<VMA_BLOCK_BITS)
2439 +#define VMA_CLUSTER_BITS (VMA_BLOCK_BITS+4)
2440 +#define VMA_CLUSTER_SIZE (1<<VMA_CLUSTER_BITS)
2441 +
2442 +#if VMA_CLUSTER_SIZE != 65536
2443 +#error unexpected cluster size
2444 +#endif
2445 +
2446 +#define VMA_EXTENT_HEADER_SIZE 512
2447 +#define VMA_BLOCKS_PER_EXTENT 59
2448 +#define VMA_MAX_CONFIGS 256
2449 +
2450 +#define VMA_MAX_EXTENT_SIZE \
2451 +    (VMA_EXTENT_HEADER_SIZE+VMA_CLUSTER_SIZE*VMA_BLOCKS_PER_EXTENT)
2452 +#if VMA_MAX_EXTENT_SIZE != 3867136
2453 +#error unexpected VMA_EXTENT_SIZE
2454 +#endif
2455 +
2456 +/* File Format Definitions */
2457 +
2458 +#define VMA_MAGIC (GUINT32_TO_BE(('V'<<24)|('M'<<16)|('A'<<8)|0x00))
2459 +#define VMA_EXTENT_MAGIC (GUINT32_TO_BE(('V'<<24)|('M'<<16)|('A'<<8)|'E'))
2460 +
2461 +typedef struct VmaDeviceInfoHeader {
2462 +    uint32_t devname_ptr; /* offset into blob_buffer table */
2463 +    uint32_t reserved0;
2464 +    uint64_t size; /* device size in bytes */
2465 +    uint64_t reserved1;
2466 +    uint64_t reserved2;
2467 +} VmaDeviceInfoHeader;
2468 +
2469 +typedef struct VmaHeader {
2470 +    uint32_t magic;
2471 +    uint32_t version;
2472 +    unsigned char uuid[16];
2473 +    int64_t ctime;
2474 +    unsigned char md5sum[16];
2475 +
2476 +    uint32_t blob_buffer_offset;
2477 +    uint32_t blob_buffer_size;
2478 +    uint32_t header_size;
2479 +
2480 +    unsigned char reserved[1984];
2481 +
2482 +    uint32_t config_names[VMA_MAX_CONFIGS]; /* offset into blob_buffer table */
2483 +    uint32_t config_data[VMA_MAX_CONFIGS];  /* offset into blob_buffer table */
2484 +
2485 +    VmaDeviceInfoHeader dev_info[256];
2486 +} VmaHeader;
2487 +
2488 +typedef struct VmaExtentHeader {
2489 +    uint32_t magic;
2490 +    uint16_t reserved1;
2491 +    uint16_t block_count;
2492 +    unsigned char uuid[16];
2493 +    unsigned char md5sum[16];
2494 +    uint64_t blockinfo[VMA_BLOCKS_PER_EXTENT];
2495 +} VmaExtentHeader;
2496 +
2497 +/* functions/definitions to read/write vma files */
2498 +
2499 +typedef struct VmaReader VmaReader;
2500 +
2501 +typedef struct VmaWriter VmaWriter;
2502 +
2503 +typedef struct VmaConfigData {
2504 +    const char *name;
2505 +    const void *data;
2506 +    uint32_t len;
2507 +} VmaConfigData;
2508 +
2509 +typedef struct VmaStreamInfo {
2510 +    uint64_t size;
2511 +    uint64_t cluster_count;
2512 +    uint64_t transferred;
2513 +    uint64_t zero_bytes;
2514 +    int finished;
2515 +    char *devname;
2516 +} VmaStreamInfo;
2517 +
2518 +typedef struct VmaStatus {
2519 +    int status;
2520 +    bool closed;
2521 +    char errmsg[8192];
2522 +    char uuid_str[37];
2523 +    VmaStreamInfo stream_info[256];
2524 +} VmaStatus;
2525 +
2526 +typedef struct VmaDeviceInfo {
2527 +    uint64_t size; /* device size in bytes */
2528 +    const char *devname;
2529 +} VmaDeviceInfo;
2530 +
2531 +extern const BackupDriver backup_vma_driver;
2532 +
2533 +VmaWriter *vma_writer_create(const char *filename, uuid_t uuid, int64_t speed,
2534 +                             Error **errp);
2535 +int vma_writer_close(VmaWriter *vmaw, Error **errp);
2536 +void vma_writer_destroy(VmaWriter *vmaw);
2537 +int vma_writer_add_config(VmaWriter *vmaw, const char *name, gpointer data,
2538 +                          size_t len);
2539 +int vma_writer_register_stream(VmaWriter *vmaw, const char *devname,
2540 +                               size_t size);
2541 +
2542 +int64_t coroutine_fn vma_writer_write(VmaWriter *vmaw, uint8_t dev_id,
2543 +                                      int64_t cluster_num, unsigned char *buf,
2544 +                                      size_t *zero_bytes);
2545 +
2546 +int coroutine_fn vma_writer_close_stream(VmaWriter *vmaw, uint8_t dev_id);
2547 +
2548 +int vma_writer_get_status(VmaWriter *vmaw, VmaStatus *status);
2549 +void vma_writer_set_error(VmaWriter *vmaw, const char *fmt, ...);
2550 +
2551 +
2552 +VmaReader *vma_reader_create(const char *filename, Error **errp);
2553 +void vma_reader_destroy(VmaReader *vmar);
2554 +VmaHeader *vma_reader_get_header(VmaReader *vmar);
2555 +GList *vma_reader_get_config_data(VmaReader *vmar);
2556 +VmaDeviceInfo *vma_reader_get_device_info(VmaReader *vmar, guint8 dev_id);
2557 +int vma_reader_register_bs(VmaReader *vmar, guint8 dev_id,
2558 +                           BlockDriverState *bs, bool write_zeroes,
2559 +                           Error **errp);
2560 +int vma_reader_restore(VmaReader *vmar, int vmstate_fd, bool verbose,
2561 +                      Error **errp);
2562 +
2563 +#endif /* BACKUP_VMA_H */
2564 --
2565 1.7.2.5
2566