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

   1 From 6289a43696ca6f713a5d3bb9f95a5adb608a5e13 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 v5 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            |  799 ++++++++++++++++++++++++++++++++++++++++
  15  vma-writer.c            |  940 +++++++++++++++++++++++++++++++++++++++++++++++
  16  vma.c                   |  561 ++++++++++++++++++++++++++++
  17  vma.h                   |  145 ++++++++
  18  8 files changed, 2476 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 0d9099a..16f1c25 100644
  27 --- a/Makefile
  28 +++ b/Makefile
  29 @@ -115,7 +115,7 @@ ifeq ($(CONFIG_SMARTCARD_NSS),y)
  30  include $(SRC_PATH)/libcacard/Makefile
  31  endif
  32
  33 -all: $(DOCS) $(TOOLS) $(HELPERS-y) recurse-all
  34 +all: $(DOCS) $(TOOLS) vma$(EXESUF) $(HELPERS-y) recurse-all
  35
  36  config-host.h: config-host.h-timestamp
  37  config-host.h-timestamp: config-host.mak
  38 @@ -167,6 +167,7 @@ qemu-img.o: qemu-img-cmds.h
  39  qemu-img$(EXESUF): qemu-img.o $(block-obj-y) libqemuutil.a libqemustub.a
  40  qemu-nbd$(EXESUF): qemu-nbd.o $(block-obj-y) libqemuutil.a libqemustub.a
  41  qemu-io$(EXESUF): qemu-io.o cmd.o $(block-obj-y) libqemuutil.a libqemustub.a
  42 +vma$(EXESUF): vma.o vma-writer.o vma-reader.o $(block-obj-y)  libqemuutil.a libqemustub.a
  43
  44  qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o
  45
  46 diff --git a/Makefile.objs b/Makefile.objs
  47 index df64f70..91f133b 100644
  48 --- a/Makefile.objs
  49 +++ b/Makefile.objs
  50 @@ -13,7 +13,7 @@ block-obj-$(CONFIG_POSIX) += aio-posix.o
  51  block-obj-$(CONFIG_WIN32) += aio-win32.o
  52  block-obj-y += block/
  53  block-obj-y += qapi-types.o qapi-visit.o
  54 -block-obj-y += backup.o
  55 +block-obj-y += vma-writer.o backup.o
  56
  57  block-obj-y += qemu-coroutine.o qemu-coroutine-lock.o qemu-coroutine-io.o
  58  block-obj-y += qemu-coroutine-sleep.o
  59 diff --git a/blockdev.c b/blockdev.c
  60 index 84f598d..683f7da 100644
  61 --- a/blockdev.c
  62 +++ b/blockdev.c
  63 @@ -21,6 +21,7 @@
  64  #include "trace.h"
  65  #include "sysemu/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 @@ -1530,10 +1531,11 @@ char *qmp_backup(const char *backup_file, 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..9b715f2
  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 +* 1 byte not used (reserved)
 105 +* 2 bytes zero indicator (mark zero regions (16x4096))
 106 +* 4 bytes cluster number
 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..bc36cba
 118 --- /dev/null
 119 +++ b/vma-reader.c
 120 @@ -0,0 +1,799 @@
 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/timer.h"
 147 +#include "qemu/ratelimit.h"
 148 +#include "vma.h"
 149 +#include "block/block.h"
 150 +
 151 +#define BITS_PER_LONG  (sizeof(unsigned long) * CHAR_BIT)
 152 +
 153 +static unsigned char zero_vma_block[VMA_BLOCK_SIZE];
 154 +
 155 +typedef struct VmaRestoreState {
 156 +    BlockDriverState *bs;
 157 +    bool write_zeroes;
 158 +    unsigned long *bitmap;
 159 +    int bitmap_size;
 160 +}  VmaRestoreState;
 161 +
 162 +struct VmaReader {
 163 +    int fd;
 164 +    GChecksum *md5csum;
 165 +    GHashTable *blob_hash;
 166 +    unsigned char *head_data;
 167 +    VmaDeviceInfo devinfo[256];
 168 +    VmaRestoreState rstate[256];
 169 +    GList *cdata_list;
 170 +    guint8 vmstate_stream;
 171 +    uint32_t vmstate_clusters;
 172 +    /* to show restore percentage if run with -v */
 173 +    time_t start_time;
 174 +    int64_t cluster_count;
 175 +    int64_t clusters_read;
 176 +    int clusters_read_per;
 177 +};
 178 +
 179 +static guint
 180 +g_int32_hash(gconstpointer v)
 181 +{
 182 +    return *(const uint32_t *)v;
 183 +}
 184 +
 185 +static gboolean
 186 +g_int32_equal(gconstpointer v1, gconstpointer v2)
 187 +{
 188 +    return *((const uint32_t *)v1) == *((const uint32_t *)v2);
 189 +}
 190 +
 191 +static int vma_reader_get_bitmap(VmaRestoreState *rstate, int64_t cluster_num)
 192 +{
 193 +    assert(rstate);
 194 +    assert(rstate->bitmap);
 195 +
 196 +    unsigned long val, idx, bit;
 197 +
 198 +    idx = cluster_num / BITS_PER_LONG;
 199 +
 200 +    assert(rstate->bitmap_size > idx);
 201 +
 202 +    bit = cluster_num % BITS_PER_LONG;
 203 +    val = rstate->bitmap[idx];
 204 +
 205 +    return !!(val & (1UL << bit));
 206 +}
 207 +
 208 +static void vma_reader_set_bitmap(VmaRestoreState *rstate, int64_t cluster_num,
 209 +                                  int dirty)
 210 +{
 211 +    assert(rstate);
 212 +    assert(rstate->bitmap);
 213 +
 214 +    unsigned long val, idx, bit;
 215 +
 216 +    idx = cluster_num / BITS_PER_LONG;
 217 +
 218 +    assert(rstate->bitmap_size > idx);
 219 +
 220 +    bit = cluster_num % BITS_PER_LONG;
 221 +    val = rstate->bitmap[idx];
 222 +    if (dirty) {
 223 +        if (!(val & (1UL << bit))) {
 224 +            val |= 1UL << bit;
 225 +        }
 226 +    } else {
 227 +        if (val & (1UL << bit)) {
 228 +            val &= ~(1UL << bit);
 229 +        }
 230 +    }
 231 +    rstate->bitmap[idx] = val;
 232 +}
 233 +
 234 +typedef struct VmaBlob {
 235 +    uint32_t start;
 236 +    uint32_t len;
 237 +    void *data;
 238 +} VmaBlob;
 239 +
 240 +static const VmaBlob *get_header_blob(VmaReader *vmar, uint32_t pos)
 241 +{
 242 +    assert(vmar);
 243 +    assert(vmar->blob_hash);
 244 +
 245 +    return g_hash_table_lookup(vmar->blob_hash, &pos);
 246 +}
 247 +
 248 +static const char *get_header_str(VmaReader *vmar, uint32_t pos)
 249 +{
 250 +    const VmaBlob *blob = get_header_blob(vmar, pos);
 251 +    if (!blob) {
 252 +        return NULL;
 253 +    }
 254 +    const char *res = (char *)blob->data;
 255 +    if (res[blob->len-1] != '\0') {
 256 +        return NULL;
 257 +    }
 258 +    return res;
 259 +}
 260 +
 261 +static ssize_t
 262 +safe_read(int fd, unsigned char *buf, size_t count)
 263 +{
 264 +    ssize_t n;
 265 +
 266 +    do {
 267 +        n = read(fd, buf, count);
 268 +    } while (n < 0 && errno == EINTR);
 269 +
 270 +    return n;
 271 +}
 272 +
 273 +static ssize_t
 274 +full_read(int fd, unsigned char *buf, size_t len)
 275 +{
 276 +    ssize_t n;
 277 +    size_t total;
 278 +
 279 +    total = 0;
 280 +
 281 +    while (len > 0) {
 282 +        n = safe_read(fd, buf, len);
 283 +
 284 +        if (n == 0) {
 285 +            return total;
 286 +        }
 287 +
 288 +        if (n <= 0) {
 289 +            break;
 290 +        }
 291 +
 292 +        buf += n;
 293 +        total += n;
 294 +        len -= n;
 295 +    }
 296 +
 297 +    if (len) {
 298 +        return -1;
 299 +    }
 300 +
 301 +    return total;
 302 +}
 303 +
 304 +void vma_reader_destroy(VmaReader *vmar)
 305 +{
 306 +    assert(vmar);
 307 +
 308 +    if (vmar->fd >= 0) {
 309 +        close(vmar->fd);
 310 +    }
 311 +
 312 +    if (vmar->cdata_list) {
 313 +        g_list_free(vmar->cdata_list);
 314 +    }
 315 +
 316 +    int i;
 317 +    for (i = 1; i < 256; i++) {
 318 +        if (vmar->rstate[i].bitmap) {
 319 +            g_free(vmar->rstate[i].bitmap);
 320 +        }
 321 +    }
 322 +
 323 +    if (vmar->md5csum) {
 324 +        g_checksum_free(vmar->md5csum);
 325 +    }
 326 +
 327 +    if (vmar->blob_hash) {
 328 +        g_hash_table_destroy(vmar->blob_hash);
 329 +    }
 330 +
 331 +    if (vmar->head_data) {
 332 +        g_free(vmar->head_data);
 333 +    }
 334 +
 335 +    g_free(vmar);
 336 +
 337 +};
 338 +
 339 +static int vma_reader_read_head(VmaReader *vmar, Error **errp)
 340 +{
 341 +    assert(vmar);
 342 +    assert(errp);
 343 +    assert(*errp == NULL);
 344 +
 345 +    unsigned char md5sum[16];
 346 +    int i;
 347 +    int ret = 0;
 348 +
 349 +    vmar->head_data = g_malloc(sizeof(VmaHeader));
 350 +
 351 +    if (full_read(vmar->fd, vmar->head_data, sizeof(VmaHeader)) !=
 352 +        sizeof(VmaHeader)) {
 353 +        error_setg(errp, "can't read vma header - %s",
 354 +                   errno ? g_strerror(errno) : "got EOF");
 355 +        return -1;
 356 +    }
 357 +
 358 +    VmaHeader *h = (VmaHeader *)vmar->head_data;
 359 +
 360 +    if (h->magic != VMA_MAGIC) {
 361 +        error_setg(errp, "not a vma file - wrong magic number");
 362 +        return -1;
 363 +    }
 364 +
 365 +    uint32_t header_size = GUINT32_FROM_BE(h->header_size);
 366 +    int need = header_size - sizeof(VmaHeader);
 367 +    if (need <= 0) {
 368 +        error_setg(errp, "wrong vma header size %d", header_size);
 369 +        return -1;
 370 +    }
 371 +
 372 +    vmar->head_data = g_realloc(vmar->head_data, header_size);
 373 +    h = (VmaHeader *)vmar->head_data;
 374 +
 375 +    if (full_read(vmar->fd, vmar->head_data + sizeof(VmaHeader), need) !=
 376 +        need) {
 377 +        error_setg(errp, "can't read vma header data - %s",
 378 +                   errno ? g_strerror(errno) : "got EOF");
 379 +        return -1;
 380 +    }
 381 +
 382 +    memcpy(md5sum, h->md5sum, 16);
 383 +    memset(h->md5sum, 0, 16);
 384 +
 385 +    g_checksum_reset(vmar->md5csum);
 386 +    g_checksum_update(vmar->md5csum, vmar->head_data, header_size);
 387 +    gsize csize = 16;
 388 +    g_checksum_get_digest(vmar->md5csum, (guint8 *)(h->md5sum), &csize);
 389 +
 390 +    if (memcmp(md5sum, h->md5sum, 16) != 0) {
 391 +        error_setg(errp, "wrong vma header chechsum");
 392 +        return -1;
 393 +    }
 394 +
 395 +    /* we can modify header data after checksum verify */
 396 +    h->header_size = header_size;
 397 +
 398 +    h->version = GUINT32_FROM_BE(h->version);
 399 +    if (h->version != 1) {
 400 +        error_setg(errp, "wrong vma version %d", h->version);
 401 +        return -1;
 402 +    }
 403 +
 404 +    h->ctime = GUINT64_FROM_BE(h->ctime);
 405 +    h->blob_buffer_offset = GUINT32_FROM_BE(h->blob_buffer_offset);
 406 +    h->blob_buffer_size = GUINT32_FROM_BE(h->blob_buffer_size);
 407 +
 408 +    uint32_t bstart = h->blob_buffer_offset + 1;
 409 +    uint32_t bend = h->blob_buffer_offset + h->blob_buffer_size;
 410 +
 411 +    if (bstart <= sizeof(VmaHeader)) {
 412 +        error_setg(errp, "wrong vma blob buffer offset %d",
 413 +                   h->blob_buffer_offset);
 414 +        return -1;
 415 +    }
 416 +
 417 +    if (bend > header_size) {
 418 +        error_setg(errp, "wrong vma blob buffer size %d/%d",
 419 +                   h->blob_buffer_offset, h->blob_buffer_size);
 420 +        return -1;
 421 +    }
 422 +
 423 +    while ((bstart + 2) <= bend) {
 424 +        uint32_t size = vmar->head_data[bstart] +
 425 +            (vmar->head_data[bstart+1] << 8);
 426 +        if ((bstart + size + 2) <= bend) {
 427 +            VmaBlob *blob = g_new0(VmaBlob, 1);
 428 +            blob->start = bstart - h->blob_buffer_offset;
 429 +            blob->len = size;
 430 +            blob->data = vmar->head_data + bstart + 2;
 431 +            g_hash_table_insert(vmar->blob_hash, &blob->start, blob);
 432 +        }
 433 +        bstart += size + 2;
 434 +    }
 435 +
 436 +
 437 +    int count = 0;
 438 +    for (i = 1; i < 256; i++) {
 439 +        VmaDeviceInfoHeader *dih = &h->dev_info[i];
 440 +        uint32_t devname_ptr = GUINT32_FROM_BE(dih->devname_ptr);
 441 +        uint64_t size = GUINT64_FROM_BE(dih->size);
 442 +        const char *devname =  get_header_str(vmar, devname_ptr);
 443 +
 444 +        if (size && devname) {
 445 +            count++;
 446 +            vmar->devinfo[i].size = size;
 447 +            vmar->devinfo[i].devname = devname;
 448 +
 449 +            if (strcmp(devname, "vmstate") == 0) {
 450 +                vmar->vmstate_stream = i;
 451 +            }
 452 +        }
 453 +    }
 454 +
 455 +    if (!count) {
 456 +        error_setg(errp, "vma does not contain data");
 457 +        return -1;
 458 +    }
 459 +
 460 +    for (i = 0; i < VMA_MAX_CONFIGS; i++) {
 461 +        uint32_t name_ptr = GUINT32_FROM_BE(h->config_names[i]);
 462 +        uint32_t data_ptr = GUINT32_FROM_BE(h->config_data[i]);
 463 +
 464 +        if (!(name_ptr && data_ptr)) {
 465 +            continue;
 466 +        }
 467 +        const char *name =  get_header_str(vmar, name_ptr);
 468 +        const VmaBlob *blob = get_header_blob(vmar, data_ptr);
 469 +
 470 +        if (!(name && blob)) {
 471 +            error_setg(errp, "vma contains invalid data pointers");
 472 +            return -1;
 473 +        }
 474 +
 475 +        VmaConfigData *cdata = g_new0(VmaConfigData, 1);
 476 +        cdata->name = name;
 477 +        cdata->data = blob->data;
 478 +        cdata->len = blob->len;
 479 +
 480 +        vmar->cdata_list = g_list_append(vmar->cdata_list, cdata);
 481 +    }
 482 +
 483 +    return ret;
 484 +};
 485 +
 486 +VmaReader *vma_reader_create(const char *filename, Error **errp)
 487 +{
 488 +    assert(filename);
 489 +    assert(errp);
 490 +
 491 +    VmaReader *vmar = g_new0(VmaReader, 1);
 492 +
 493 +    if (strcmp(filename, "-") == 0) {
 494 +        vmar->fd = dup(0);
 495 +    } else {
 496 +        vmar->fd = open(filename, O_RDONLY);
 497 +    }
 498 +
 499 +    if (vmar->fd < 0) {
 500 +        error_setg(errp, "can't open file %s - %s\n", filename,
 501 +                   g_strerror(errno));
 502 +        goto err;
 503 +    }
 504 +
 505 +    vmar->md5csum = g_checksum_new(G_CHECKSUM_MD5);
 506 +    if (!vmar->md5csum) {
 507 +        error_setg(errp, "can't allocate cmsum\n");
 508 +        goto err;
 509 +    }
 510 +
 511 +    vmar->blob_hash = g_hash_table_new_full(g_int32_hash, g_int32_equal,
 512 +                                            NULL, g_free);
 513 +
 514 +    if (vma_reader_read_head(vmar, errp) < 0) {
 515 +        goto err;
 516 +    }
 517 +
 518 +    return vmar;
 519 +
 520 +err:
 521 +    if (vmar) {
 522 +        vma_reader_destroy(vmar);
 523 +    }
 524 +
 525 +    return NULL;
 526 +}
 527 +
 528 +VmaHeader *vma_reader_get_header(VmaReader *vmar)
 529 +{
 530 +    assert(vmar);
 531 +    assert(vmar->head_data);
 532 +
 533 +    return (VmaHeader *)(vmar->head_data);
 534 +}
 535 +
 536 +GList *vma_reader_get_config_data(VmaReader *vmar)
 537 +{
 538 +    assert(vmar);
 539 +    assert(vmar->head_data);
 540 +
 541 +    return vmar->cdata_list;
 542 +}
 543 +
 544 +VmaDeviceInfo *vma_reader_get_device_info(VmaReader *vmar, guint8 dev_id)
 545 +{
 546 +    assert(vmar);
 547 +    assert(dev_id);
 548 +
 549 +    if (vmar->devinfo[dev_id].size && vmar->devinfo[dev_id].devname) {
 550 +        return &vmar->devinfo[dev_id];
 551 +    }
 552 +
 553 +    return NULL;
 554 +}
 555 +
 556 +int vma_reader_register_bs(VmaReader *vmar, guint8 dev_id, BlockDriverState *bs,
 557 +                           bool write_zeroes, Error **errp)
 558 +{
 559 +    assert(vmar);
 560 +    assert(bs != NULL);
 561 +    assert(dev_id);
 562 +    assert(vmar->rstate[dev_id].bs == NULL);
 563 +
 564 +    int64_t size = bdrv_getlength(bs);
 565 +    if (size != vmar->devinfo[dev_id].size) {
 566 +        error_setg(errp, "vma_reader_register_bs for stream %s failed - "
 567 +                   "unexpected size %zd != %zd", vmar->devinfo[dev_id].devname,
 568 +                   size, vmar->devinfo[dev_id].size);
 569 +        return -1;
 570 +    }
 571 +
 572 +    vmar->rstate[dev_id].bs = bs;
 573 +    vmar->rstate[dev_id].write_zeroes = write_zeroes;
 574 +
 575 +    int64_t bitmap_size = (size/BDRV_SECTOR_SIZE) +
 576 +        (VMA_CLUSTER_SIZE/BDRV_SECTOR_SIZE) * BITS_PER_LONG - 1;
 577 +    bitmap_size /= (VMA_CLUSTER_SIZE/BDRV_SECTOR_SIZE) * BITS_PER_LONG;
 578 +
 579 +    vmar->rstate[dev_id].bitmap_size = bitmap_size;
 580 +    vmar->rstate[dev_id].bitmap = g_new0(unsigned long, bitmap_size);
 581 +
 582 +    vmar->cluster_count += size/VMA_CLUSTER_SIZE;
 583 +
 584 +    return 0;
 585 +}
 586 +
 587 +static ssize_t safe_write(int fd, void *buf, size_t count)
 588 +{
 589 +    ssize_t n;
 590 +
 591 +    do {
 592 +        n = write(fd, buf, count);
 593 +    } while (n < 0 && errno == EINTR);
 594 +
 595 +    return n;
 596 +}
 597 +
 598 +static size_t full_write(int fd, void *buf, size_t len)
 599 +{
 600 +    ssize_t n;
 601 +    size_t total;
 602 +
 603 +    total = 0;
 604 +
 605 +    while (len > 0) {
 606 +        n = safe_write(fd, buf, len);
 607 +        if (n < 0) {
 608 +            return n;
 609 +        }
 610 +        buf += n;
 611 +        total += n;
 612 +        len -= n;
 613 +    }
 614 +
 615 +    if (len) {
 616 +        /* incomplete write ? */
 617 +        return -1;
 618 +    }
 619 +
 620 +    return total;
 621 +}
 622 +
 623 +static int restore_write_data(VmaReader *vmar, guint8 dev_id,
 624 +                              BlockDriverState *bs, int vmstate_fd,
 625 +                              unsigned char *buf, int64_t sector_num,
 626 +                              int nb_sectors, Error **errp)
 627 +{
 628 +    assert(vmar);
 629 +
 630 +    if (dev_id == vmar->vmstate_stream) {
 631 +        if (vmstate_fd >= 0) {
 632 +            int len = nb_sectors * BDRV_SECTOR_SIZE;
 633 +            int res = full_write(vmstate_fd, buf, len);
 634 +            if (res < 0) {
 635 +                error_setg(errp, "write vmstate failed %d", res);
 636 +                return -1;
 637 +            }
 638 +        }
 639 +    } else {
 640 +        int res = bdrv_write(bs, sector_num, buf, nb_sectors);
 641 +        if (res < 0) {
 642 +            error_setg(errp, "bdrv_write to %s failed (%d)",
 643 +                       bdrv_get_device_name(bs), res);
 644 +            return -1;
 645 +        }
 646 +    }
 647 +    return 0;
 648 +}
 649 +static int restore_extent(VmaReader *vmar, unsigned char *buf,
 650 +                          int extent_size, int vmstate_fd,
 651 +                          bool verbose, Error **errp)
 652 +{
 653 +    assert(vmar);
 654 +    assert(buf);
 655 +
 656 +    VmaExtentHeader *ehead = (VmaExtentHeader *)buf;
 657 +    int start = VMA_EXTENT_HEADER_SIZE;
 658 +    int i;
 659 +
 660 +    for (i = 0; i < VMA_BLOCKS_PER_EXTENT; i++) {
 661 +        uint64_t block_info = GUINT64_FROM_BE(ehead->blockinfo[i]);
 662 +        uint64_t cluster_num = block_info & 0xffffffff;
 663 +        uint8_t dev_id = (block_info >> 32) & 0xff;
 664 +        uint16_t mask = block_info >> (32+16);
 665 +        int64_t max_sector;
 666 +
 667 +        if (!dev_id) {
 668 +            continue;
 669 +        }
 670 +
 671 +        VmaRestoreState *rstate = &vmar->rstate[dev_id];
 672 +        BlockDriverState *bs = NULL;
 673 +
 674 +        if (dev_id != vmar->vmstate_stream) {
 675 +            bs = rstate->bs;
 676 +            if (!bs) {
 677 +                error_setg(errp, "got wrong dev id %d", dev_id);
 678 +                return -1;
 679 +            }
 680 +
 681 +            if (vma_reader_get_bitmap(rstate, cluster_num)) {
 682 +                error_setg(errp, "found duplicated cluster %zd for stream %s",
 683 +                          cluster_num, vmar->devinfo[dev_id].devname);
 684 +                return -1;
 685 +            }
 686 +            vma_reader_set_bitmap(rstate, cluster_num, 1);
 687 +
 688 +            max_sector = vmar->devinfo[dev_id].size/BDRV_SECTOR_SIZE;
 689 +        } else {
 690 +            max_sector = G_MAXINT64;
 691 +            if (cluster_num != vmar->vmstate_clusters) {
 692 +                error_setg(errp, "found out of order vmstate data");
 693 +                return -1;
 694 +            }
 695 +            vmar->vmstate_clusters++;
 696 +        }
 697 +
 698 +        vmar->clusters_read++;
 699 +
 700 +        if (verbose) {
 701 +            time_t duration = time(NULL) - vmar->start_time;
 702 +            int percent = (vmar->clusters_read*100)/vmar->cluster_count;
 703 +            if (percent != vmar->clusters_read_per) {
 704 +                printf("progress %d%% (read %zd bytes, duration %zd sec)\n",
 705 +                       percent, vmar->clusters_read*VMA_CLUSTER_SIZE,
 706 +                       duration);
 707 +                fflush(stdout);
 708 +                vmar->clusters_read_per = percent;
 709 +            }
 710 +        }
 711 +
 712 +        /* try to write whole clusters to speedup restore */
 713 +        if (mask == 0xffff) {
 714 +            if ((start + VMA_CLUSTER_SIZE) > extent_size) {
 715 +                error_setg(errp, "short vma extent - too many blocks");
 716 +                return -1;
 717 +            }
 718 +            int64_t sector_num = (cluster_num * VMA_CLUSTER_SIZE) /
 719 +                BDRV_SECTOR_SIZE;
 720 +            int64_t end_sector = sector_num +
 721 +                VMA_CLUSTER_SIZE/BDRV_SECTOR_SIZE;
 722 +
 723 +            if (end_sector > max_sector) {
 724 +                end_sector = max_sector;
 725 +            }
 726 +
 727 +            if (end_sector <= sector_num) {
 728 +                error_setg(errp, "got wrong block address - write bejond end");
 729 +                return -1;
 730 +            }
 731 +
 732 +            int nb_sectors = end_sector - sector_num;
 733 +            if (restore_write_data(vmar, dev_id, bs, vmstate_fd, buf + start,
 734 +                                   sector_num, nb_sectors, errp) < 0) {
 735 +                return -1;
 736 +            }
 737 +
 738 +            start += VMA_CLUSTER_SIZE;
 739 +        } else {
 740 +            int j;
 741 +            int bit = 1;
 742 +
 743 +            for (j = 0; j < 16; j++) {
 744 +                int64_t sector_num = (cluster_num*VMA_CLUSTER_SIZE +
 745 +                                      j*VMA_BLOCK_SIZE)/BDRV_SECTOR_SIZE;
 746 +
 747 +                int64_t end_sector = sector_num +
 748 +                    VMA_BLOCK_SIZE/BDRV_SECTOR_SIZE;
 749 +                if (end_sector > max_sector) {
 750 +                    end_sector = max_sector;
 751 +                }
 752 +
 753 +                if (mask & bit) {
 754 +                    if ((start + VMA_BLOCK_SIZE) > extent_size) {
 755 +                        error_setg(errp, "short vma extent - too many blocks");
 756 +                        return -1;
 757 +                    }
 758 +
 759 +                    if (end_sector <= sector_num) {
 760 +                        error_setg(errp, "got wrong block address - "
 761 +                                   "write bejond end");
 762 +                        return -1;
 763 +                    }
 764 +
 765 +                    int nb_sectors = end_sector - sector_num;
 766 +                    if (restore_write_data(vmar, dev_id, bs, vmstate_fd,
 767 +                                           buf + start, sector_num,
 768 +                                           nb_sectors, errp) < 0) {
 769 +                        return -1;
 770 +                    }
 771 +
 772 +                    start += VMA_BLOCK_SIZE;
 773 +
 774 +                } else {
 775 +
 776 +                    if (rstate->write_zeroes && (end_sector > sector_num)) {
 777 +                        /* Todo: use bdrv_co_write_zeroes (but that need to
 778 +                         * be run inside coroutine?)
 779 +                         */
 780 +                        int nb_sectors = end_sector - sector_num;
 781 +                        if (restore_write_data(vmar, dev_id, bs, vmstate_fd,
 782 +                                              zero_vma_block, sector_num,
 783 +                                               nb_sectors, errp) < 0) {
 784 +                            return -1;
 785 +                        }
 786 +                    }
 787 +                }
 788 +
 789 +                bit = bit << 1;
 790 +            }
 791 +        }
 792 +    }
 793 +
 794 +    if (start != extent_size) {
 795 +        error_setg(errp, "vma extent error - missing blocks");
 796 +        return -1;
 797 +    }
 798 +
 799 +    return 0;
 800 +}
 801 +
 802 +int vma_reader_restore(VmaReader *vmar, int vmstate_fd, bool verbose,
 803 +                       Error **errp)
 804 +{
 805 +    assert(vmar);
 806 +    assert(vmar->head_data);
 807 +
 808 +    int ret = 0;
 809 +    unsigned char buf[VMA_MAX_EXTENT_SIZE];
 810 +    int buf_pos = 0;
 811 +    unsigned char md5sum[16];
 812 +    VmaHeader *h = (VmaHeader *)vmar->head_data;
 813 +
 814 +    vmar->start_time = time(NULL);
 815 +
 816 +    while (1) {
 817 +        int bytes = full_read(vmar->fd, buf + buf_pos, sizeof(buf) - buf_pos);
 818 +        if (bytes < 0) {
 819 +            error_setg(errp, "read failed - %s", g_strerror(errno));
 820 +            return -1;
 821 +        }
 822 +
 823 +        buf_pos += bytes;
 824 +
 825 +        if (!buf_pos) {
 826 +            break; /* EOF */
 827 +        }
 828 +
 829 +        if (buf_pos < VMA_EXTENT_HEADER_SIZE) {
 830 +            error_setg(errp, "read short extent (%d bytes)", buf_pos);
 831 +            return -1;
 832 +        }
 833 +
 834 +        VmaExtentHeader *ehead = (VmaExtentHeader *)buf;
 835 +
 836 +        /* extract md5sum */
 837 +        memcpy(md5sum, ehead->md5sum, sizeof(ehead->md5sum));
 838 +        memset(ehead->md5sum, 0, sizeof(ehead->md5sum));
 839 +
 840 +        g_checksum_reset(vmar->md5csum);
 841 +        g_checksum_update(vmar->md5csum, buf, VMA_EXTENT_HEADER_SIZE);
 842 +        gsize csize = 16;
 843 +        g_checksum_get_digest(vmar->md5csum, ehead->md5sum, &csize);
 844 +
 845 +        if (memcmp(md5sum, ehead->md5sum, 16) != 0) {
 846 +            error_setg(errp, "wrong vma extent header chechsum");
 847 +            return -1;
 848 +        }
 849 +
 850 +        if (memcmp(h->uuid, ehead->uuid, sizeof(ehead->uuid)) != 0) {
 851 +            error_setg(errp, "wrong vma extent uuid");
 852 +            return -1;
 853 +        }
 854 +
 855 +        if (ehead->magic != VMA_EXTENT_MAGIC || ehead->reserved1 != 0) {
 856 +            error_setg(errp, "wrong vma extent header magic");
 857 +            return -1;
 858 +        }
 859 +
 860 +        int block_count = GUINT16_FROM_BE(ehead->block_count);
 861 +        int extent_size = VMA_EXTENT_HEADER_SIZE + block_count*VMA_BLOCK_SIZE;
 862 +
 863 +        if (buf_pos < extent_size) {
 864 +            error_setg(errp, "short vma extent (%d < %d)", buf_pos,
 865 +                       extent_size);
 866 +            return -1;
 867 +        }
 868 +
 869 +        if (restore_extent(vmar, buf, extent_size, vmstate_fd, verbose,
 870 +                           errp) < 0) {
 871 +            return -1;
 872 +        }
 873 +
 874 +        if (buf_pos > extent_size) {
 875 +            memmove(buf, buf + extent_size, buf_pos - extent_size);
 876 +            buf_pos = buf_pos - extent_size;
 877 +        } else {
 878 +            buf_pos = 0;
 879 +        }
 880 +    }
 881 +
 882 +    bdrv_drain_all();
 883 +
 884 +    int i;
 885 +    for (i = 1; i < 256; i++) {
 886 +        VmaRestoreState *rstate = &vmar->rstate[i];
 887 +        if (!rstate->bs) {
 888 +            continue;
 889 +        }
 890 +
 891 +        if (bdrv_flush(rstate->bs) < 0) {
 892 +            error_setg(errp, "vma bdrv_flush %s failed",
 893 +                       vmar->devinfo[i].devname);
 894 +            return -1;
 895 +        }
 896 +
 897 +        if (vmar->devinfo[i].size &&
 898 +            (strcmp(vmar->devinfo[i].devname, "vmstate") != 0)) {
 899 +            assert(rstate->bitmap);
 900 +
 901 +            int64_t cluster_num, end;
 902 +
 903 +            end = (vmar->devinfo[i].size + VMA_CLUSTER_SIZE - 1) /
 904 +                VMA_CLUSTER_SIZE;
 905 +
 906 +            for (cluster_num = 0; cluster_num < end; cluster_num++) {
 907 +                if (!vma_reader_get_bitmap(rstate, cluster_num)) {
 908 +                    error_setg(errp, "detected missing cluster %zd "
 909 +                               "for stream %s", cluster_num,
 910 +                               vmar->devinfo[i].devname);
 911 +                    return -1;
 912 +                }
 913 +            }
 914 +        }
 915 +    }
 916 +
 917 +    return ret;
 918 +}
 919 +
 920 diff --git a/vma-writer.c b/vma-writer.c
 921 new file mode 100644
 922 index 0000000..9228ca6
 923 --- /dev/null
 924 +++ b/vma-writer.c
 925 @@ -0,0 +1,940 @@
 926 +/*
 927 + * VMA: Virtual Machine Archive
 928 + *
 929 + * Copyright (C) 2012 Proxmox Server Solutions
 930 + *
 931 + * Authors:
 932 + *  Dietmar Maurer (dietmar@proxmox.com)
 933 + *
 934 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
 935 + * See the COPYING file in the top-level directory.
 936 + *
 937 + */
 938 +
 939 +#include <stdio.h>
 940 +#include <errno.h>
 941 +#include <unistd.h>
 942 +#include <stdio.h>
 943 +#include <string.h>
 944 +#include <sys/types.h>
 945 +#include <sys/stat.h>
 946 +#include <fcntl.h>
 947 +#include <glib.h>
 948 +#include <uuid/uuid.h>
 949 +
 950 +#include "qemu-common.h"
 951 +#include "vma.h"
 952 +#include "block/block.h"
 953 +#include "monitor/monitor.h"
 954 +
 955 +#define DEBUG_VMA 0
 956 +
 957 +#define DPRINTF(fmt, ...)\
 958 +    do { if (DEBUG_VMA) { printf("vma: " fmt, ## __VA_ARGS__); } } while (0)
 959 +
 960 +#define WRITE_BUFFERS 5
 961 +
 962 +typedef struct VmaAIOCB VmaAIOCB;
 963 +struct VmaAIOCB {
 964 +    unsigned char buffer[VMA_MAX_EXTENT_SIZE];
 965 +    VmaWriter *vmaw;
 966 +    size_t bytes;
 967 +    Coroutine *co;
 968 +};
 969 +
 970 +struct VmaWriter {
 971 +    int fd;
 972 +    FILE *cmd;
 973 +    int status;
 974 +    char errmsg[8192];
 975 +    uuid_t uuid;
 976 +    bool header_written;
 977 +    bool closed;
 978 +
 979 +    /* we always write extents */
 980 +    unsigned char outbuf[VMA_MAX_EXTENT_SIZE];
 981 +    int outbuf_pos; /* in bytes */
 982 +    int outbuf_count; /* in VMA_BLOCKS */
 983 +    uint64_t outbuf_block_info[VMA_BLOCKS_PER_EXTENT];
 984 +
 985 +    VmaAIOCB *aiocbs[WRITE_BUFFERS];
 986 +    CoQueue wqueue;
 987 +
 988 +    GChecksum *md5csum;
 989 +    CoMutex writer_lock;
 990 +    CoMutex flush_lock;
 991 +    Coroutine *co_writer;
 992 +
 993 +    /* drive informations */
 994 +    VmaStreamInfo stream_info[256];
 995 +    guint stream_count;
 996 +
 997 +    guint8 vmstate_stream;
 998 +    uint32_t vmstate_clusters;
 999 +
1000 +    /* header blob table */
1001 +    char *header_blob_table;
1002 +    uint32_t header_blob_table_size;
1003 +    uint32_t header_blob_table_pos;
1004 +
1005 +    /* store for config blobs */
1006 +    uint32_t config_names[VMA_MAX_CONFIGS]; /* offset into blob_buffer table */
1007 +    uint32_t config_data[VMA_MAX_CONFIGS];  /* offset into blob_buffer table */
1008 +    uint32_t config_count;
1009 +};
1010 +
1011 +void vma_writer_set_error(VmaWriter *vmaw, const char *fmt, ...)
1012 +{
1013 +    va_list ap;
1014 +
1015 +    if (vmaw->status < 0) {
1016 +        return;
1017 +    }
1018 +
1019 +    vmaw->status = -1;
1020 +
1021 +    va_start(ap, fmt);
1022 +    g_vsnprintf(vmaw->errmsg, sizeof(vmaw->errmsg), fmt, ap);
1023 +    va_end(ap);
1024 +
1025 +    DPRINTF("vma_writer_set_error: %s\n", vmaw->errmsg);
1026 +}
1027 +
1028 +static uint32_t allocate_header_blob(VmaWriter *vmaw, const char *data,
1029 +                                     size_t len)
1030 +{
1031 +    if (len > 65535) {
1032 +        return 0;
1033 +    }
1034 +
1035 +    if (!vmaw->header_blob_table ||
1036 +        (vmaw->header_blob_table_size <
1037 +         (vmaw->header_blob_table_pos + len + 2))) {
1038 +        int newsize = vmaw->header_blob_table_size + ((len + 2 + 511)/512)*512;
1039 +
1040 +        vmaw->header_blob_table = g_realloc(vmaw->header_blob_table, newsize);
1041 +        memset(vmaw->header_blob_table + vmaw->header_blob_table_size,
1042 +               0, newsize - vmaw->header_blob_table_size);
1043 +        vmaw->header_blob_table_size = newsize;
1044 +    }
1045 +
1046 +    uint32_t cpos = vmaw->header_blob_table_pos;
1047 +    vmaw->header_blob_table[cpos] = len & 255;
1048 +    vmaw->header_blob_table[cpos+1] = (len >> 8) & 255;
1049 +    memcpy(vmaw->header_blob_table + cpos + 2, data, len);
1050 +    vmaw->header_blob_table_pos += len + 2;
1051 +    return cpos;
1052 +}
1053 +
1054 +static uint32_t allocate_header_string(VmaWriter *vmaw, const char *str)
1055 +{
1056 +    assert(vmaw);
1057 +
1058 +    size_t len = strlen(str) + 1;
1059 +
1060 +    return allocate_header_blob(vmaw, str, len);
1061 +}
1062 +
1063 +int vma_writer_add_config(VmaWriter *vmaw, const char *name, gpointer data,
1064 +                          gsize len)
1065 +{
1066 +    assert(vmaw);
1067 +    assert(!vmaw->header_written);
1068 +    assert(vmaw->config_count < VMA_MAX_CONFIGS);
1069 +    assert(name);
1070 +    assert(data);
1071 +    assert(len);
1072 +
1073 +    uint32_t name_ptr = allocate_header_string(vmaw, name);
1074 +    if (!name_ptr) {
1075 +        return -1;
1076 +    }
1077 +
1078 +    uint32_t data_ptr = allocate_header_blob(vmaw, data, len);
1079 +    if (!data_ptr) {
1080 +        return -1;
1081 +    }
1082 +
1083 +    vmaw->config_names[vmaw->config_count] = name_ptr;
1084 +    vmaw->config_data[vmaw->config_count] = data_ptr;
1085 +
1086 +    vmaw->config_count++;
1087 +
1088 +    return 0;
1089 +}
1090 +
1091 +int vma_writer_register_stream(VmaWriter *vmaw, const char *devname,
1092 +                               size_t size)
1093 +{
1094 +    assert(vmaw);
1095 +    assert(devname);
1096 +    assert(!vmaw->status);
1097 +
1098 +    if (vmaw->header_written) {
1099 +        vma_writer_set_error(vmaw, "vma_writer_register_stream: header "
1100 +                             "already written");
1101 +        return -1;
1102 +    }
1103 +
1104 +    guint n = vmaw->stream_count + 1;
1105 +
1106 +    /* we can have dev_ids form 1 to 255 (0 reserved)
1107 +     * 255(-1) reseverd for safety
1108 +     */
1109 +    if (n > 254) {
1110 +        vma_writer_set_error(vmaw, "vma_writer_register_stream: "
1111 +                             "too many drives");
1112 +        return -1;
1113 +    }
1114 +
1115 +    if (size <= 0) {
1116 +        vma_writer_set_error(vmaw, "vma_writer_register_stream: "
1117 +                             "got strange size %zd", size);
1118 +        return -1;
1119 +    }
1120 +
1121 +    DPRINTF("vma_writer_register_stream %s %zu %d\n", devname, size, n);
1122 +
1123 +    vmaw->stream_info[n].devname = g_strdup(devname);
1124 +    vmaw->stream_info[n].size = size;
1125 +
1126 +    vmaw->stream_info[n].cluster_count = (size + VMA_CLUSTER_SIZE - 1) /
1127 +        VMA_CLUSTER_SIZE;
1128 +
1129 +    vmaw->stream_count = n;
1130 +
1131 +    if (strcmp(devname, "vmstate") == 0) {
1132 +        vmaw->vmstate_stream = n;
1133 +    }
1134 +
1135 +    return n;
1136 +}
1137 +
1138 +static void vma_co_continue_write(void *opaque)
1139 +{
1140 +    VmaWriter *vmaw = opaque;
1141 +
1142 +    DPRINTF("vma_co_continue_write\n");
1143 +    qemu_coroutine_enter(vmaw->co_writer, NULL);
1144 +}
1145 +
1146 +static int vma_co_write_finished(void *opaque)
1147 +{
1148 +    VmaWriter *vmaw = opaque;
1149 +
1150 +    return (vmaw->co_writer != 0);
1151 +}
1152 +
1153 +static ssize_t coroutine_fn
1154 +vma_co_write(VmaWriter *vmaw, const void *buf, size_t bytes)
1155 +{
1156 +    size_t done = 0;
1157 +    ssize_t ret;
1158 +
1159 +    /* atomic writes (we cannot interleave writes) */
1160 +    qemu_co_mutex_lock(&vmaw->writer_lock);
1161 +
1162 +    DPRINTF("vma_co_write enter %zd\n", bytes);
1163 +
1164 +    assert(vmaw->co_writer == NULL);
1165 +
1166 +    vmaw->co_writer = qemu_coroutine_self();
1167 +
1168 +    qemu_aio_set_fd_handler(vmaw->fd, NULL, vma_co_continue_write,
1169 +                            vma_co_write_finished, vmaw);
1170 +
1171 +    DPRINTF("vma_co_write wait until writable\n");
1172 +    qemu_coroutine_yield();
1173 +    DPRINTF("vma_co_write starting %zd\n", bytes);
1174 +
1175 +    while (done < bytes) {
1176 +        ret = write(vmaw->fd, buf + done, bytes - done);
1177 +        if (ret > 0) {
1178 +            done += ret;
1179 +            DPRINTF("vma_co_write written %zd %zd\n", done, ret);
1180 +        } else if (ret < 0) {
1181 +            if (errno == EAGAIN || errno == EWOULDBLOCK) {
1182 +                DPRINTF("vma_co_write yield %zd\n", done);
1183 +                qemu_coroutine_yield();
1184 +                DPRINTF("vma_co_write restart %zd\n", done);
1185 +            } else {
1186 +                vma_writer_set_error(vmaw, "vma_co_write write error - %s",
1187 +                                     g_strerror(errno));
1188 +                done = -1; /* always return failure for partial writes */
1189 +                break;
1190 +            }
1191 +        } else if (ret == 0) {
1192 +            /* should not happen - simply try again */
1193 +        }
1194 +    }
1195 +
1196 +    qemu_aio_set_fd_handler(vmaw->fd, NULL, NULL, NULL, NULL);
1197 +
1198 +    vmaw->co_writer = NULL;
1199 +
1200 +    qemu_co_mutex_unlock(&vmaw->writer_lock);
1201 +
1202 +    DPRINTF("vma_co_write leave %zd\n", done);
1203 +    return done;
1204 +}
1205 +
1206 +static void coroutine_fn vma_co_writer_task(void *opaque)
1207 +{
1208 +    VmaAIOCB *cb = opaque;
1209 +
1210 +    DPRINTF("vma_co_writer_task start\n");
1211 +
1212 +    int64_t done = vma_co_write(cb->vmaw, cb->buffer, cb->bytes);
1213 +    DPRINTF("vma_co_writer_task write done %zd\n", done);
1214 +
1215 +    if (done != cb->bytes) {
1216 +        DPRINTF("vma_co_writer_task failed write %zd %zd", cb->bytes, done);
1217 +        vma_writer_set_error(cb->vmaw, "vma_co_writer_task failed write %zd",
1218 +                             done);
1219 +    }
1220 +
1221 +    cb->bytes = 0;
1222 +
1223 +    qemu_co_queue_next(&cb->vmaw->wqueue);
1224 +
1225 +    DPRINTF("vma_co_writer_task end\n");
1226 +}
1227 +
1228 +static void coroutine_fn vma_queue_flush(VmaWriter *vmaw)
1229 +{
1230 +    DPRINTF("vma_queue_flush enter\n");
1231 +
1232 +    assert(vmaw);
1233 +
1234 +    while (1) {
1235 +        int i;
1236 +        VmaAIOCB *cb = NULL;
1237 +        for (i = 0; i < WRITE_BUFFERS; i++) {
1238 +            if (vmaw->aiocbs[i]->bytes) {
1239 +                cb = vmaw->aiocbs[i];
1240 +                DPRINTF("FOUND USED AIO BUFFER %d %zd\n", i,
1241 +                        vmaw->aiocbs[i]->bytes);
1242 +                break;
1243 +            }
1244 +        }
1245 +        if (!cb) {
1246 +            break;
1247 +        }
1248 +        qemu_co_queue_wait(&vmaw->wqueue);
1249 +    }
1250 +
1251 +    DPRINTF("vma_queue_flush leave\n");
1252 +}
1253 +
1254 +/**
1255 + * NOTE: pipe buffer size in only 4096 bytes on linux (see 'ulimit -a')
1256 + * So we need to create a coroutione to allow 'parallel' execution.
1257 + */
1258 +static ssize_t coroutine_fn
1259 +vma_queue_write(VmaWriter *vmaw, const void *buf, size_t bytes)
1260 +{
1261 +    DPRINTF("vma_queue_write enter %zd\n", bytes);
1262 +
1263 +    assert(vmaw);
1264 +    assert(buf);
1265 +    assert(bytes <= VMA_MAX_EXTENT_SIZE);
1266 +
1267 +    VmaAIOCB *cb = NULL;
1268 +    while (!cb) {
1269 +        int i;
1270 +        for (i = 0; i < WRITE_BUFFERS; i++) {
1271 +            if (!vmaw->aiocbs[i]->bytes) {
1272 +                cb = vmaw->aiocbs[i];
1273 +                break;
1274 +            }
1275 +        }
1276 +        if (!cb) {
1277 +            qemu_co_queue_wait(&vmaw->wqueue);
1278 +        }
1279 +    }
1280 +
1281 +    memcpy(cb->buffer, buf, bytes);
1282 +    cb->bytes = bytes;
1283 +    cb->vmaw = vmaw;
1284 +
1285 +    DPRINTF("vma_queue_write start %zd\n", bytes);
1286 +    cb->co = qemu_coroutine_create(vma_co_writer_task);
1287 +    qemu_coroutine_enter(cb->co, cb);
1288 +
1289 +    DPRINTF("vma_queue_write leave\n");
1290 +
1291 +    return bytes;
1292 +}
1293 +
1294 +VmaWriter *vma_writer_create(const char *filename, uuid_t uuid, Error **errp)
1295 +{
1296 +    const char *p;
1297 +
1298 +    assert(sizeof(VmaHeader) == (4096 + 8192));
1299 +    assert(sizeof(VmaExtentHeader) == 512);
1300 +
1301 +    VmaWriter *vmaw = g_new0(VmaWriter, 1);
1302 +    vmaw->fd = -1;
1303 +
1304 +    vmaw->md5csum = g_checksum_new(G_CHECKSUM_MD5);
1305 +    if (!vmaw->md5csum) {
1306 +        error_setg(errp, "can't allocate cmsum\n");
1307 +        goto err;
1308 +    }
1309 +
1310 +    if (strstart(filename, "exec:", &p)) {
1311 +        vmaw->cmd = popen(p, "w");
1312 +        if (vmaw->cmd == NULL) {
1313 +            error_setg(errp, "can't popen command '%s' - %s\n", p,
1314 +                       g_strerror(errno));
1315 +            goto err;
1316 +        }
1317 +        vmaw->fd = fileno(vmaw->cmd);
1318 +
1319 +        /* try to use O_NONBLOCK and O_DIRECT */
1320 +        fcntl(vmaw->fd, F_SETFL, fcntl(vmaw->fd, F_GETFL)|O_NONBLOCK);
1321 +        fcntl(vmaw->fd, F_SETFL, fcntl(vmaw->fd, F_GETFL)|O_DIRECT);
1322 +
1323 +    } else {
1324 +        struct stat st;
1325 +        int oflags;
1326 +        const char *tmp_id_str;
1327 +
1328 +        if ((stat(filename, &st) == 0) && S_ISFIFO(st.st_mode)) {
1329 +            oflags = O_NONBLOCK|O_DIRECT|O_WRONLY;
1330 +            vmaw->fd = qemu_open(filename, oflags, 0644);
1331 +        } else if (strstart(filename, "/dev/fdset/", &tmp_id_str)) {
1332 +            oflags = O_NONBLOCK|O_DIRECT|O_WRONLY;
1333 +            vmaw->fd = qemu_open(filename, oflags, 0644);
1334 +        } else if (strstart(filename, "/dev/fdname/", &tmp_id_str)) {
1335 +            vmaw->fd = monitor_get_fd(cur_mon, tmp_id_str, errp);
1336 +            if (vmaw->fd < 0) {
1337 +                goto err;
1338 +            }
1339 +            /* try to use O_NONBLOCK and O_DIRECT */
1340 +            fcntl(vmaw->fd, F_SETFL, fcntl(vmaw->fd, F_GETFL)|O_NONBLOCK);
1341 +            fcntl(vmaw->fd, F_SETFL, fcntl(vmaw->fd, F_GETFL)|O_DIRECT);
1342 +        } else  {
1343 +            oflags = O_NONBLOCK|O_DIRECT|O_WRONLY|O_CREAT|O_EXCL;
1344 +            vmaw->fd = qemu_open(filename, oflags, 0644);
1345 +        }
1346 +
1347 +        if (vmaw->fd < 0) {
1348 +            error_setg(errp, "can't open file %s - %s\n", filename,
1349 +                       g_strerror(errno));
1350 +            goto err;
1351 +        }
1352 +    }
1353 +
1354 +    /* we use O_DIRECT, so we need to align IO buffers */
1355 +    int i;
1356 +    for (i = 0; i < WRITE_BUFFERS; i++) {
1357 +        vmaw->aiocbs[i] = qemu_memalign(512, sizeof(VmaAIOCB));
1358 +        memset(vmaw->aiocbs[i], 0, sizeof(VmaAIOCB));
1359 +    }
1360 +
1361 +    vmaw->outbuf_count = 0;
1362 +    vmaw->outbuf_pos = VMA_EXTENT_HEADER_SIZE;
1363 +
1364 +    vmaw->header_blob_table_pos = 1; /* start at pos 1 */
1365 +
1366 +    qemu_co_mutex_init(&vmaw->writer_lock);
1367 +    qemu_co_mutex_init(&vmaw->flush_lock);
1368 +    qemu_co_queue_init(&vmaw->wqueue);
1369 +
1370 +    uuid_copy(vmaw->uuid, uuid);
1371 +
1372 +    return vmaw;
1373 +
1374 +err:
1375 +    if (vmaw) {
1376 +        if (vmaw->cmd) {
1377 +            pclose(vmaw->cmd);
1378 +        } else if (vmaw->fd >= 0) {
1379 +            close(vmaw->fd);
1380 +        }
1381 +
1382 +        if (vmaw->md5csum) {
1383 +            g_checksum_free(vmaw->md5csum);
1384 +        }
1385 +
1386 +        g_free(vmaw);
1387 +    }
1388 +
1389 +    return NULL;
1390 +}
1391 +
1392 +static int coroutine_fn vma_write_header(VmaWriter *vmaw)
1393 +{
1394 +    assert(vmaw);
1395 +    int header_clusters = 8;
1396 +    char buf[65536*header_clusters];
1397 +    VmaHeader *head = (VmaHeader *)buf;
1398 +
1399 +    int i;
1400 +
1401 +    DPRINTF("VMA WRITE HEADER\n");
1402 +
1403 +    if (vmaw->status < 0) {
1404 +        return vmaw->status;
1405 +    }
1406 +
1407 +    memset(buf, 0, sizeof(buf));
1408 +
1409 +    head->magic = VMA_MAGIC;
1410 +    head->version = GUINT32_TO_BE(1); /* v1 */
1411 +    memcpy(head->uuid, vmaw->uuid, 16);
1412 +
1413 +    time_t ctime = time(NULL);
1414 +    head->ctime = GUINT64_TO_BE(ctime);
1415 +
1416 +    if (!vmaw->stream_count) {
1417 +        return -1;
1418 +    }
1419 +
1420 +    for (i = 0; i < VMA_MAX_CONFIGS; i++) {
1421 +        head->config_names[i] = GUINT32_TO_BE(vmaw->config_names[i]);
1422 +        head->config_data[i] = GUINT32_TO_BE(vmaw->config_data[i]);
1423 +    }
1424 +
1425 +    /* 32 bytes per device (12 used currently) = 8192 bytes max */
1426 +    for (i = 1; i <= 254; i++) {
1427 +        VmaStreamInfo *si = &vmaw->stream_info[i];
1428 +        if (si->size) {
1429 +            assert(si->devname);
1430 +            uint32_t devname_ptr = allocate_header_string(vmaw, si->devname);
1431 +            if (!devname_ptr) {
1432 +                return -1;
1433 +            }
1434 +            head->dev_info[i].devname_ptr = GUINT32_TO_BE(devname_ptr);
1435 +            head->dev_info[i].size = GUINT64_TO_BE(si->size);
1436 +        }
1437 +    }
1438 +
1439 +    uint32_t header_size = sizeof(VmaHeader) + vmaw->header_blob_table_size;
1440 +    head->header_size = GUINT32_TO_BE(header_size);
1441 +
1442 +    if (header_size > sizeof(buf)) {
1443 +        return -1; /* just to be sure */
1444 +    }
1445 +
1446 +    uint32_t blob_buffer_offset = sizeof(VmaHeader);
1447 +    memcpy(buf + blob_buffer_offset, vmaw->header_blob_table,
1448 +           vmaw->header_blob_table_size);
1449 +    head->blob_buffer_offset = GUINT32_TO_BE(blob_buffer_offset);
1450 +    head->blob_buffer_size = GUINT32_TO_BE(vmaw->header_blob_table_pos);
1451 +
1452 +    g_checksum_reset(vmaw->md5csum);
1453 +    g_checksum_update(vmaw->md5csum, (const guchar *)buf, header_size);
1454 +    gsize csize = 16;
1455 +    g_checksum_get_digest(vmaw->md5csum, (guint8 *)(head->md5sum), &csize);
1456 +
1457 +    return vma_queue_write(vmaw, buf, header_size);
1458 +}
1459 +
1460 +static int coroutine_fn vma_writer_flush(VmaWriter *vmaw)
1461 +{
1462 +    assert(vmaw);
1463 +
1464 +    int ret;
1465 +    int i;
1466 +
1467 +    if (vmaw->status < 0) {
1468 +        return vmaw->status;
1469 +    }
1470 +
1471 +    if (!vmaw->header_written) {
1472 +        vmaw->header_written = true;
1473 +        ret = vma_write_header(vmaw);
1474 +        if (ret < 0) {
1475 +            vma_writer_set_error(vmaw, "vma_writer_flush: write header failed");
1476 +            return ret;
1477 +        }
1478 +    }
1479 +
1480 +    DPRINTF("VMA WRITE FLUSH %d %d\n", vmaw->outbuf_count, vmaw->outbuf_pos);
1481 +
1482 +
1483 +    VmaExtentHeader *ehead = (VmaExtentHeader *)vmaw->outbuf;
1484 +
1485 +    ehead->magic = VMA_EXTENT_MAGIC;
1486 +    ehead->reserved1 = 0;
1487 +
1488 +    for (i = 0; i < VMA_BLOCKS_PER_EXTENT; i++) {
1489 +        ehead->blockinfo[i] = GUINT64_TO_BE(vmaw->outbuf_block_info[i]);
1490 +    }
1491 +
1492 +    guint16 block_count = (vmaw->outbuf_pos - VMA_EXTENT_HEADER_SIZE) /
1493 +        VMA_BLOCK_SIZE;
1494 +
1495 +    ehead->block_count = GUINT16_TO_BE(block_count);
1496 +
1497 +    memcpy(ehead->uuid, vmaw->uuid, sizeof(ehead->uuid));
1498 +    memset(ehead->md5sum, 0, sizeof(ehead->md5sum));
1499 +
1500 +    g_checksum_reset(vmaw->md5csum);
1501 +    g_checksum_update(vmaw->md5csum, vmaw->outbuf, VMA_EXTENT_HEADER_SIZE);
1502 +    gsize csize = 16;
1503 +    g_checksum_get_digest(vmaw->md5csum, ehead->md5sum, &csize);
1504 +
1505 +    int bytes = vmaw->outbuf_pos;
1506 +    ret = vma_queue_write(vmaw, vmaw->outbuf, bytes);
1507 +    if (ret != bytes) {
1508 +        vma_writer_set_error(vmaw, "vma_writer_flush: failed write");
1509 +    }
1510 +
1511 +    vmaw->outbuf_count = 0;
1512 +    vmaw->outbuf_pos = VMA_EXTENT_HEADER_SIZE;
1513 +
1514 +    for (i = 0; i < VMA_BLOCKS_PER_EXTENT; i++) {
1515 +        vmaw->outbuf_block_info[i] = 0;
1516 +    }
1517 +
1518 +    return vmaw->status;
1519 +}
1520 +
1521 +static int vma_count_open_streams(VmaWriter *vmaw)
1522 +{
1523 +    g_assert(vmaw != NULL);
1524 +
1525 +    int i;
1526 +    int open_drives = 0;
1527 +    for (i = 0; i <= 255; i++) {
1528 +        if (vmaw->stream_info[i].size && !vmaw->stream_info[i].finished) {
1529 +            open_drives++;
1530 +        }
1531 +    }
1532 +
1533 +    return open_drives;
1534 +}
1535 +
1536 +/**
1537 + * all jobs should call this when there is no more data
1538 + * Returns: number of remaining stream (0 ==> finished)
1539 + */
1540 +int coroutine_fn
1541 +vma_writer_close_stream(VmaWriter *vmaw, uint8_t dev_id)
1542 +{
1543 +    g_assert(vmaw != NULL);
1544 +
1545 +    DPRINTF("vma_writer_set_status %d\n", dev_id);
1546 +    if (!vmaw->stream_info[dev_id].size) {
1547 +        vma_writer_set_error(vmaw, "vma_writer_close_stream: "
1548 +                             "no such stream %d", dev_id);
1549 +        return -1;
1550 +    }
1551 +    if (vmaw->stream_info[dev_id].finished) {
1552 +        vma_writer_set_error(vmaw, "vma_writer_close_stream: "
1553 +                             "stream already closed %d", dev_id);
1554 +        return -1;
1555 +    }
1556 +
1557 +    vmaw->stream_info[dev_id].finished = true;
1558 +
1559 +    int open_drives = vma_count_open_streams(vmaw);
1560 +
1561 +    if (open_drives <= 0) {
1562 +        DPRINTF("vma_writer_set_status all drives completed\n");
1563 +        qemu_co_mutex_lock(&vmaw->flush_lock);
1564 +        int ret = vma_writer_flush(vmaw);
1565 +        qemu_co_mutex_unlock(&vmaw->flush_lock);
1566 +        if (ret < 0) {
1567 +            vma_writer_set_error(vmaw, "vma_writer_close_stream: flush failed");
1568 +        }
1569 +    }
1570 +
1571 +    return open_drives;
1572 +}
1573 +
1574 +int vma_writer_get_status(VmaWriter *vmaw, VmaStatus *status)
1575 +{
1576 +    int i;
1577 +
1578 +    g_assert(vmaw != NULL);
1579 +
1580 +    if (status) {
1581 +        status->status = vmaw->status;
1582 +        g_strlcpy(status->errmsg, vmaw->errmsg, sizeof(status->errmsg));
1583 +        for (i = 0; i <= 255; i++) {
1584 +            status->stream_info[i] = vmaw->stream_info[i];
1585 +        }
1586 +
1587 +        uuid_unparse_lower(vmaw->uuid, status->uuid_str);
1588 +    }
1589 +
1590 +    status->closed = vmaw->closed;
1591 +
1592 +    return vmaw->status;
1593 +}
1594 +
1595 +static int vma_writer_get_buffer(VmaWriter *vmaw)
1596 +{
1597 +    int ret = 0;
1598 +
1599 +    qemu_co_mutex_lock(&vmaw->flush_lock);
1600 +
1601 +    /* wait until buffer is available */
1602 +    while (vmaw->outbuf_count >= (VMA_BLOCKS_PER_EXTENT - 1)) {
1603 +        ret = vma_writer_flush(vmaw);
1604 +        if (ret < 0) {
1605 +            vma_writer_set_error(vmaw, "vma_writer_get_buffer: flush failed");
1606 +            break;
1607 +        }
1608 +    }
1609 +
1610 +    qemu_co_mutex_unlock(&vmaw->flush_lock);
1611 +
1612 +    return ret;
1613 +}
1614 +
1615 +
1616 +int64_t coroutine_fn
1617 +vma_writer_write(VmaWriter *vmaw, uint8_t dev_id, int64_t cluster_num,
1618 +                 unsigned char *buf, size_t *zero_bytes)
1619 +{
1620 +    g_assert(vmaw != NULL);
1621 +    g_assert(zero_bytes != NULL);
1622 +
1623 +    *zero_bytes = 0;
1624 +
1625 +    if (vmaw->status < 0) {
1626 +        return vmaw->status;
1627 +    }
1628 +
1629 +    if (!dev_id || !vmaw->stream_info[dev_id].size) {
1630 +        vma_writer_set_error(vmaw, "vma_writer_write: "
1631 +                             "no such stream %d", dev_id);
1632 +        return -1;
1633 +    }
1634 +
1635 +    if (vmaw->stream_info[dev_id].finished) {
1636 +        vma_writer_set_error(vmaw, "vma_writer_write: "
1637 +                             "stream already closed %d", dev_id);
1638 +        return -1;
1639 +    }
1640 +
1641 +
1642 +    if (cluster_num >= (((uint64_t)1)<<32)) {
1643 +        vma_writer_set_error(vmaw, "vma_writer_write: "
1644 +                             "cluster number out of range");
1645 +        return -1;
1646 +    }
1647 +
1648 +    if (dev_id == vmaw->vmstate_stream) {
1649 +        if (cluster_num != vmaw->vmstate_clusters) {
1650 +            vma_writer_set_error(vmaw, "vma_writer_write: "
1651 +                                 "non sequential vmstate write");
1652 +        }
1653 +        vmaw->vmstate_clusters++;
1654 +    } else if (cluster_num >= vmaw->stream_info[dev_id].cluster_count) {
1655 +        vma_writer_set_error(vmaw, "vma_writer_write: cluster number too big");
1656 +        return -1;
1657 +    }
1658 +
1659 +    /* wait until buffer is available */
1660 +    if (vma_writer_get_buffer(vmaw) < 0) {
1661 +        vma_writer_set_error(vmaw, "vma_writer_write: "
1662 +                             "vma_writer_get_buffer failed");
1663 +        return -1;
1664 +    }
1665 +
1666 +    DPRINTF("VMA WRITE %d %zd\n", dev_id, cluster_num);
1667 +
1668 +    uint16_t mask = 0;
1669 +
1670 +    if (buf) {
1671 +        int i;
1672 +        int bit = 1;
1673 +        for (i = 0; i < 16; i++) {
1674 +            unsigned char *vmablock = buf + (i*VMA_BLOCK_SIZE);
1675 +            if (!buffer_is_zero(vmablock, VMA_BLOCK_SIZE)) {
1676 +                mask |= bit;
1677 +                memcpy(vmaw->outbuf + vmaw->outbuf_pos, vmablock,
1678 +                       VMA_BLOCK_SIZE);
1679 +                vmaw->outbuf_pos += VMA_BLOCK_SIZE;
1680 +            } else {
1681 +                DPRINTF("VMA WRITE %zd ZERO BLOCK %d\n", cluster_num, i);
1682 +                vmaw->stream_info[dev_id].zero_bytes += VMA_BLOCK_SIZE;
1683 +                *zero_bytes += VMA_BLOCK_SIZE;
1684 +            }
1685 +
1686 +            bit = bit << 1;
1687 +        }
1688 +    } else {
1689 +        DPRINTF("VMA WRITE %zd ZERO CLUSTER\n", cluster_num);
1690 +        vmaw->stream_info[dev_id].zero_bytes += VMA_CLUSTER_SIZE;
1691 +        *zero_bytes += VMA_CLUSTER_SIZE;
1692 +    }
1693 +
1694 +    uint64_t block_info = ((uint64_t)mask) << (32+16);
1695 +    block_info |= ((uint64_t)dev_id) << 32;
1696 +    block_info |= (cluster_num & 0xffffffff);
1697 +    vmaw->outbuf_block_info[vmaw->outbuf_count] = block_info;
1698 +
1699 +    DPRINTF("VMA WRITE MASK %zd %zx\n", cluster_num, block_info);
1700 +
1701 +    vmaw->outbuf_count++;
1702 +
1703 +    /** NOTE: We allways write whole clusters, but we correctly set
1704 +     * transferred bytes. So transferred == size when when everything
1705 +     * went OK.
1706 +     */
1707 +    size_t transferred = VMA_CLUSTER_SIZE;
1708 +
1709 +    if (dev_id != vmaw->vmstate_stream) {
1710 +        uint64_t last = (cluster_num + 1) * VMA_CLUSTER_SIZE;
1711 +        if (last > vmaw->stream_info[dev_id].size) {
1712 +            uint64_t diff = last - vmaw->stream_info[dev_id].size;
1713 +            if (diff >= VMA_CLUSTER_SIZE) {
1714 +                vma_writer_set_error(vmaw, "vma_writer_write: "
1715 +                                     "read after last cluster");
1716 +                return -1;
1717 +            }
1718 +            transferred -= diff;
1719 +        }
1720 +    }
1721 +
1722 +    vmaw->stream_info[dev_id].transferred += transferred;
1723 +
1724 +    return transferred;
1725 +}
1726 +
1727 +int vma_writer_close(VmaWriter *vmaw, Error **errp)
1728 +{
1729 +    g_assert(vmaw != NULL);
1730 +
1731 +    int i;
1732 +
1733 +    vma_queue_flush(vmaw);
1734 +
1735 +    /* this should not happen - just to be sure */
1736 +    while (!qemu_co_queue_empty(&vmaw->wqueue)) {
1737 +        DPRINTF("vma_writer_close wait\n");
1738 +        co_sleep_ns(rt_clock, 1000000);
1739 +    }
1740 +
1741 +    if (vmaw->cmd) {
1742 +        if (pclose(vmaw->cmd) < 0) {
1743 +            vma_writer_set_error(vmaw, "vma_writer_close: "
1744 +                                 "pclose failed - %s", g_strerror(errno));
1745 +        }
1746 +    } else {
1747 +        if (close(vmaw->fd) < 0) {
1748 +            vma_writer_set_error(vmaw, "vma_writer_close: "
1749 +                                 "close failed - %s", g_strerror(errno));
1750 +        }
1751 +    }
1752 +
1753 +    for (i = 0; i <= 255; i++) {
1754 +        VmaStreamInfo *si = &vmaw->stream_info[i];
1755 +        if (si->size) {
1756 +            if (!si->finished) {
1757 +                vma_writer_set_error(vmaw, "vma_writer_close: "
1758 +                                     "detected open stream '%s'", si->devname);
1759 +            } else if ((si->transferred != si->size) &&
1760 +                       (i != vmaw->vmstate_stream)) {
1761 +                vma_writer_set_error(vmaw, "vma_writer_close: "
1762 +                                     "incomplete stream '%s' (%zd != %zd)",
1763 +                                     si->devname, si->transferred, si->size);
1764 +            }
1765 +        }
1766 +    }
1767 +
1768 +    for (i = 0; i <= 255; i++) {
1769 +        vmaw->stream_info[i].finished = 1; /* mark as closed */
1770 +    }
1771 +
1772 +    vmaw->closed = 1;
1773 +
1774 +    if (vmaw->status < 0 && *errp == NULL) {
1775 +        error_setg(errp, "%s", vmaw->errmsg);
1776 +    }
1777 +
1778 +    return vmaw->status;
1779 +}
1780 +
1781 +void vma_writer_destroy(VmaWriter *vmaw)
1782 +{
1783 +    assert(vmaw);
1784 +
1785 +    int i;
1786 +
1787 +    for (i = 0; i <= 255; i++) {
1788 +        if (vmaw->stream_info[i].devname) {
1789 +            g_free(vmaw->stream_info[i].devname);
1790 +        }
1791 +    }
1792 +
1793 +    if (vmaw->md5csum) {
1794 +        g_checksum_free(vmaw->md5csum);
1795 +    }
1796 +
1797 +    for (i = 0; i < WRITE_BUFFERS; i++) {
1798 +        free(vmaw->aiocbs[i]);
1799 +    }
1800 +
1801 +    g_free(vmaw);
1802 +}
1803 +
1804 +/* backup driver plugin */
1805 +
1806 +static int vma_dump_cb(void *opaque, uint8_t dev_id, int64_t cluster_num,
1807 +                       unsigned char *buf, size_t *zero_bytes)
1808 +{
1809 +    VmaWriter *vmaw = opaque;
1810 +
1811 +    return vma_writer_write(vmaw, dev_id, cluster_num, buf, zero_bytes);
1812 +}
1813 +
1814 +static int vma_close_cb(void *opaque, Error **errp)
1815 +{
1816 +    VmaWriter *vmaw = opaque;
1817 +
1818 +    int res = vma_writer_close(vmaw, errp);
1819 +    vma_writer_destroy(vmaw);
1820 +
1821 +    return res;
1822 +}
1823 +
1824 +static int vma_complete_cb(void *opaque, uint8_t dev_id, int ret)
1825 +{
1826 +    VmaWriter *vmaw = opaque;
1827 +
1828 +    if (ret < 0) {
1829 +        vma_writer_set_error(vmaw, "backup_complete_cb %d", ret);
1830 +    }
1831 +
1832 +    return vma_writer_close_stream(vmaw, dev_id);
1833 +}
1834 +
1835 +static int vma_register_stream_cb(void *opaque, const char *devname,
1836 +                                  size_t size)
1837 +{
1838 +    VmaWriter *vmaw = opaque;
1839 +
1840 +    return vma_writer_register_stream(vmaw, devname, size);
1841 +}
1842 +
1843 +static int vma_register_config_cb(void *opaque, const char *name,
1844 +                                  gpointer data, size_t data_len)
1845 +{
1846 +    VmaWriter *vmaw = opaque;
1847 +
1848 +    return vma_writer_add_config(vmaw, name, data, data_len);
1849 +}
1850 +
1851 +static void *vma_open_cb(const char *filename, uuid_t uuid, Error **errp)
1852 +{
1853 +    return vma_writer_create(filename, uuid, errp);
1854 +}
1855 +
1856 +const BackupDriver backup_vma_driver = {
1857 +    .format = "vma",
1858 +    .open = vma_open_cb,
1859 +    .close = vma_close_cb,
1860 +    .register_config = vma_register_config_cb,
1861 +    .register_stream = vma_register_stream_cb,
1862 +    .dump = vma_dump_cb,
1863 +    .complete = vma_complete_cb,
1864 +};
1865 +
1866 diff --git a/vma.c b/vma.c
1867 new file mode 100644
1868 index 0000000..6633aa5
1869 --- /dev/null
1870 +++ b/vma.c
1871 @@ -0,0 +1,561 @@
1872 +/*
1873 + * VMA: Virtual Machine Archive
1874 + *
1875 + * Copyright (C) 2012 Proxmox Server Solutions
1876 + *
1877 + * Authors:
1878 + *  Dietmar Maurer (dietmar@proxmox.com)
1879 + *
1880 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
1881 + * See the COPYING file in the top-level directory.
1882 + *
1883 + */
1884 +
1885 +#include <stdio.h>
1886 +#include <errno.h>
1887 +#include <unistd.h>
1888 +#include <stdio.h>
1889 +#include <string.h>
1890 +#include <sys/types.h>
1891 +#include <sys/stat.h>
1892 +#include <fcntl.h>
1893 +#include <glib.h>
1894 +
1895 +#include "qemu-common.h"
1896 +#include "qemu/error-report.h"
1897 +#include "vma.h"
1898 +#include "block/block.h"
1899 +
1900 +static void help(void)
1901 +{
1902 +    const char *help_msg =
1903 +        "usage: vma command [command options]\n"
1904 +        "\n"
1905 +        "vma list <filename>\n"
1906 +        "vma create <filename> [-c config] <archive> pathname ...\n"
1907 +        "vma extract <filename> [-r] <targetdir>\n"
1908 +        ;
1909 +
1910 +    printf("%s", help_msg);
1911 +    exit(1);
1912 +}
1913 +
1914 +static const char *extract_devname(const char *path, char **devname, int index)
1915 +{
1916 +    assert(path);
1917 +
1918 +    const char *sep = strchr(path, '=');
1919 +
1920 +    if (sep) {
1921 +        *devname = g_strndup(path, sep - path);
1922 +        path = sep + 1;
1923 +    } else {
1924 +        if (index >= 0) {
1925 +            *devname = g_strdup_printf("disk%d", index);
1926 +        } else {
1927 +            *devname = NULL;
1928 +        }
1929 +    }
1930 +
1931 +    return path;
1932 +}
1933 +
1934 +static void print_content(VmaReader *vmar)
1935 +{
1936 +    assert(vmar);
1937 +
1938 +    VmaHeader *head = vma_reader_get_header(vmar);
1939 +
1940 +    GList *l = vma_reader_get_config_data(vmar);
1941 +    while (l && l->data) {
1942 +        VmaConfigData *cdata = (VmaConfigData *)l->data;
1943 +        l = g_list_next(l);
1944 +        printf("CFG: size: %d name: %s\n", cdata->len, cdata->name);
1945 +    }
1946 +
1947 +    int i;
1948 +    VmaDeviceInfo *di;
1949 +    for (i = 1; i < 255; i++) {
1950 +        di = vma_reader_get_device_info(vmar, i);
1951 +        if (di) {
1952 +            if (strcmp(di->devname, "vmstate") == 0) {
1953 +                printf("VMSTATE: dev_id=%d memory: %zd\n", i, di->size);
1954 +            } else {
1955 +                printf("DEV: dev_id=%d size: %zd devname: %s\n",
1956 +                       i, di->size, di->devname);
1957 +            }
1958 +        }
1959 +    }
1960 +    /* ctime is the last entry we print */
1961 +    printf("CTIME: %s", ctime(&head->ctime));
1962 +    fflush(stdout);
1963 +}
1964 +
1965 +static int list_content(int argc, char **argv)
1966 +{
1967 +    int c, ret = 0;
1968 +    const char *filename;
1969 +
1970 +    for (;;) {
1971 +        c = getopt(argc, argv, "h");
1972 +        if (c == -1) {
1973 +            break;
1974 +        }
1975 +        switch (c) {
1976 +        case '?':
1977 +        case 'h':
1978 +            help();
1979 +            break;
1980 +        default:
1981 +            g_assert_not_reached();
1982 +        }
1983 +    }
1984 +
1985 +    /* Get the filename */
1986 +    if ((optind + 1) != argc) {
1987 +        help();
1988 +    }
1989 +    filename = argv[optind++];
1990 +
1991 +    Error *errp = NULL;
1992 +    VmaReader *vmar = vma_reader_create(filename, &errp);
1993 +
1994 +    if (!vmar) {
1995 +        g_error("%s", error_get_pretty(errp));
1996 +    }
1997 +
1998 +    print_content(vmar);
1999 +
2000 +    vma_reader_destroy(vmar);
2001 +
2002 +    return ret;
2003 +}
2004 +
2005 +typedef struct RestoreMap {
2006 +    char *devname;
2007 +    char *path;
2008 +    bool write_zero;
2009 +} RestoreMap;
2010 +
2011 +static int extract_content(int argc, char **argv)
2012 +{
2013 +    int c, ret = 0;
2014 +    int verbose = 0;
2015 +    const char *filename;
2016 +    const char *dirname;
2017 +    const char *readmap = NULL;
2018 +
2019 +    for (;;) {
2020 +        c = getopt(argc, argv, "hvr:");
2021 +        if (c == -1) {
2022 +            break;
2023 +        }
2024 +        switch (c) {
2025 +        case '?':
2026 +        case 'h':
2027 +            help();
2028 +            break;
2029 +        case 'r':
2030 +            readmap = optarg;
2031 +            break;
2032 +        case 'v':
2033 +            verbose = 1;
2034 +            break;
2035 +        default:
2036 +            help();
2037 +        }
2038 +    }
2039 +
2040 +    /* Get the filename */
2041 +    if ((optind + 2) != argc) {
2042 +        help();
2043 +    }
2044 +    filename = argv[optind++];
2045 +    dirname = argv[optind++];
2046 +
2047 +    Error *errp = NULL;
2048 +    VmaReader *vmar = vma_reader_create(filename, &errp);
2049 +
2050 +    if (!vmar) {
2051 +        g_error("%s", error_get_pretty(errp));
2052 +    }
2053 +
2054 +    if (mkdir(dirname, 0777) < 0) {
2055 +        g_error("unable to create target directory %s - %s",
2056 +                dirname, g_strerror(errno));
2057 +    }
2058 +
2059 +    GList *l = vma_reader_get_config_data(vmar);
2060 +    while (l && l->data) {
2061 +        VmaConfigData *cdata = (VmaConfigData *)l->data;
2062 +        l = g_list_next(l);
2063 +        char *cfgfn = g_strdup_printf("%s/%s", dirname, cdata->name);
2064 +        GError *err = NULL;
2065 +        if (!g_file_set_contents(cfgfn, (gchar *)cdata->data, cdata->len,
2066 +                                 &err)) {
2067 +            g_error("unable to write file: %s", err->message);
2068 +        }
2069 +    }
2070 +
2071 +    GHashTable *devmap = g_hash_table_new(g_str_hash, g_str_equal);
2072 +
2073 +    if (readmap) {
2074 +        print_content(vmar);
2075 +
2076 +        FILE *map = fopen(readmap, "r");
2077 +        if (!map) {
2078 +            g_error("unable to open fifo %s - %s", readmap, g_strerror(errno));
2079 +        }
2080 +
2081 +        while (1) {
2082 +            char inbuf[8192];
2083 +            char *line = fgets(inbuf, sizeof(inbuf), map);
2084 +            if (!line || line[0] == '\0' || !strcmp(line, "done\n")) {
2085 +                break;
2086 +            }
2087 +            int len = strlen(line);
2088 +            if (line[len - 1] == '\n') {
2089 +                line[len - 1] = '\0';
2090 +                if (len == 1) {
2091 +                    break;
2092 +                }
2093 +            }
2094 +
2095 +            const char *path;
2096 +            bool write_zero;
2097 +            if (line[0] == '0' && line[1] == ':') {
2098 +                path = inbuf + 2;
2099 +                write_zero = false;
2100 +            } else if (line[0] == '1' && line[1] == ':') {
2101 +                path = inbuf + 2;
2102 +                write_zero = true;
2103 +            } else {
2104 +                g_error("read map failed - parse error ('%s')", inbuf);
2105 +            }
2106 +
2107 +            char *devname = NULL;
2108 +            path = extract_devname(path, &devname, -1);
2109 +            if (!devname) {
2110 +                g_error("read map failed - no dev name specified ('%s')",
2111 +                        inbuf);
2112 +            }
2113 +
2114 +            RestoreMap *map = g_new0(RestoreMap, 1);
2115 +            map->devname = g_strdup(devname);
2116 +            map->path = g_strdup(path);
2117 +            map->write_zero = write_zero;
2118 +
2119 +            g_hash_table_insert(devmap, map->devname, map);
2120 +
2121 +        };
2122 +    }
2123 +
2124 +    int i;
2125 +    int vmstate_fd = -1;
2126 +    guint8 vmstate_stream = 0;
2127 +
2128 +    for (i = 1; i < 255; i++) {
2129 +        VmaDeviceInfo *di = vma_reader_get_device_info(vmar, i);
2130 +        if (di && (strcmp(di->devname, "vmstate") == 0)) {
2131 +            vmstate_stream = i;
2132 +            char *statefn = g_strdup_printf("%s/vmstate.bin", dirname);
2133 +            vmstate_fd = open(statefn, O_WRONLY|O_CREAT|O_EXCL, 0644);
2134 +            if (vmstate_fd < 0) {
2135 +                g_error("create vmstate file '%s' failed - %s", statefn,
2136 +                        g_strerror(errno));
2137 +            }
2138 +            g_free(statefn);
2139 +        } else if (di) {
2140 +            char *devfn = NULL;
2141 +            int flags = BDRV_O_RDWR|BDRV_O_CACHE_WB;
2142 +            bool write_zero = true;
2143 +
2144 +            if (readmap) {
2145 +                RestoreMap *map;
2146 +                map = (RestoreMap *)g_hash_table_lookup(devmap, di->devname);
2147 +                if (map == NULL) {
2148 +                    g_error("no device name mapping for %s", di->devname);
2149 +                }
2150 +                devfn = map->path;
2151 +                write_zero = map->write_zero;
2152 +            } else {
2153 +                devfn = g_strdup_printf("%s/tmp-disk-%s.raw",
2154 +                                        dirname, di->devname);
2155 +                printf("DEVINFO %s %zd\n", devfn, di->size);
2156 +
2157 +                bdrv_img_create(devfn, "raw", NULL, NULL, NULL, di->size,
2158 +                                flags, &errp);
2159 +                if (error_is_set(&errp)) {
2160 +                    g_error("can't create file %s: %s", devfn,
2161 +                            error_get_pretty(errp));
2162 +                }
2163 +
2164 +                /* Note: we created an empty file above, so there is no
2165 +                 * need to write zeroes (so we generate a sparse file)
2166 +                 */
2167 +                write_zero = false;
2168 +            }
2169 +
2170 +            BlockDriverState *bs = bdrv_new(di->devname);
2171 +            if (bdrv_open(bs, devfn, flags, NULL)) {
2172 +                g_error("can't open file %s", devfn);
2173 +            }
2174 +            if (vma_reader_register_bs(vmar, i, bs, write_zero, &errp) < 0) {
2175 +                g_error("%s", error_get_pretty(errp));
2176 +            }
2177 +
2178 +            if (!readmap) {
2179 +                g_free(devfn);
2180 +            }
2181 +        }
2182 +    }
2183 +
2184 +    if (vma_reader_restore(vmar, vmstate_fd, verbose, &errp) < 0) {
2185 +        g_error("restore failed - %s", error_get_pretty(errp));
2186 +    }
2187 +
2188 +    if (!readmap) {
2189 +        for (i = 1; i < 255; i++) {
2190 +            VmaDeviceInfo *di = vma_reader_get_device_info(vmar, i);
2191 +            if (di && (i != vmstate_stream)) {
2192 +                char *tmpfn = g_strdup_printf("%s/tmp-disk-%s.raw",
2193 +                                              dirname, di->devname);
2194 +                char *fn = g_strdup_printf("%s/disk-%s.raw",
2195 +                                           dirname, di->devname);
2196 +                if (rename(tmpfn, fn) != 0) {
2197 +                    g_error("rename %s to %s failed - %s",
2198 +                            tmpfn, fn, g_strerror(errno));
2199 +                }
2200 +            }
2201 +        }
2202 +    }
2203 +
2204 +    vma_reader_destroy(vmar);
2205 +
2206 +    bdrv_close_all();
2207 +
2208 +    return ret;
2209 +}
2210 +
2211 +typedef struct BackupCB {
2212 +    VmaWriter *vmaw;
2213 +    uint8_t dev_id;
2214 +} BackupCB;
2215 +
2216 +static int backup_dump_cb(void *opaque, BlockDriverState *bs,
2217 +                          int64_t cluster_num, unsigned char *buf)
2218 +{
2219 +    BackupCB *bcb = opaque;
2220 +    size_t zb = 0;
2221 +    if (vma_writer_write(bcb->vmaw, bcb->dev_id, cluster_num, buf, &zb) < 0) {
2222 +        g_warning("backup_dump_cb vma_writer_write failed");
2223 +        return -1;
2224 +    }
2225 +
2226 +    return 0;
2227 +}
2228 +
2229 +static void backup_complete_cb(void *opaque, int ret)
2230 +{
2231 +    BackupCB *bcb = opaque;
2232 +
2233 +    if (ret < 0) {
2234 +        vma_writer_set_error(bcb->vmaw, "backup_complete_cb %d", ret);
2235 +    }
2236 +
2237 +    if (vma_writer_close_stream(bcb->vmaw, bcb->dev_id) <= 0) {
2238 +        Error *err = NULL;
2239 +        if (vma_writer_close(bcb->vmaw, &err) != 0) {
2240 +            g_warning("vma_writer_close failed %s", error_get_pretty(err));
2241 +        }
2242 +    }
2243 +}
2244 +
2245 +static int create_archive(int argc, char **argv)
2246 +{
2247 +    int i, c, res;
2248 +    int verbose = 0;
2249 +    const char *archivename;
2250 +    GList *config_files = NULL;
2251 +
2252 +    for (;;) {
2253 +        c = getopt(argc, argv, "hvc:");
2254 +        if (c == -1) {
2255 +            break;
2256 +        }
2257 +        switch (c) {
2258 +        case '?':
2259 +        case 'h':
2260 +            help();
2261 +            break;
2262 +        case 'c':
2263 +            config_files = g_list_append(config_files, optarg);
2264 +            break;
2265 +        case 'v':
2266 +            verbose = 1;
2267 +            break;
2268 +        default:
2269 +            g_assert_not_reached();
2270 +        }
2271 +    }
2272 +
2273 +
2274 +    /* make sure we have archive name and at least one path */
2275 +    if ((optind + 2) > argc) {
2276 +        help();
2277 +    }
2278 +
2279 +    archivename = argv[optind++];
2280 +
2281 +    uuid_t uuid;
2282 +    uuid_generate(uuid);
2283 +
2284 +    Error *local_err = NULL;
2285 +    VmaWriter *vmaw = vma_writer_create(archivename, uuid, &local_err);
2286 +
2287 +    if (vmaw == NULL) {
2288 +        g_error("%s", error_get_pretty(local_err));
2289 +    }
2290 +
2291 +    GList *l = config_files;
2292 +    while (l && l->data) {
2293 +        char *name = l->data;
2294 +        char *cdata = NULL;
2295 +        gsize clen = 0;
2296 +        GError *err = NULL;
2297 +        if (!g_file_get_contents(name, &cdata, &clen, &err)) {
2298 +            unlink(archivename);
2299 +            g_error("Unable to read file: %s", err->message);
2300 +        }
2301 +
2302 +        if (vma_writer_add_config(vmaw, name, cdata, clen) != 0) {
2303 +            unlink(archivename);
2304 +            g_error("Unable to append config data %s (len = %zd)",
2305 +                    name, clen);
2306 +        }
2307 +        l = g_list_next(l);
2308 +    }
2309 +
2310 +    int ind = 0;
2311 +    while (optind < argc) {
2312 +        const char *path = argv[optind++];
2313 +        char *devname = NULL;
2314 +        path = extract_devname(path, &devname, ind++);
2315 +
2316 +        BlockDriver *drv = NULL;
2317 +        BlockDriverState *bs = bdrv_new(devname);
2318 +
2319 +        res = bdrv_open(bs, path, BDRV_O_CACHE_WB , drv);
2320 +        if (res < 0) {
2321 +            unlink(archivename);
2322 +            g_error("bdrv_open '%s' failed", path);
2323 +        }
2324 +        int64_t size = bdrv_getlength(bs);
2325 +        int dev_id = vma_writer_register_stream(vmaw, devname, size);
2326 +        if (dev_id <= 0) {
2327 +            unlink(archivename);
2328 +            g_error("vma_writer_register_stream '%s' failed", devname);
2329 +        }
2330 +
2331 +        BackupCB *bcb = g_new0(BackupCB, 1);
2332 +        bcb->vmaw = vmaw;
2333 +        bcb->dev_id = dev_id;
2334 +
2335 +        if (backup_job_create(bs, backup_dump_cb, backup_complete_cb,
2336 +                              bcb, 0) < 0) {
2337 +            unlink(archivename);
2338 +            g_error("backup_job_start failed");
2339 +        } else {
2340 +            backup_job_start(bs, false);
2341 +        }
2342 +    }
2343 +
2344 +    VmaStatus vmastat;
2345 +    int percent = 0;
2346 +    int last_percent = -1;
2347 +
2348 +    while (1) {
2349 +        main_loop_wait(false);
2350 +        vma_writer_get_status(vmaw, &vmastat);
2351 +
2352 +        if (verbose) {
2353 +
2354 +            uint64_t total = 0;
2355 +            uint64_t transferred = 0;
2356 +            uint64_t zero_bytes = 0;
2357 +
2358 +            int i;
2359 +            for (i = 0; i < 256; i++) {
2360 +                if (vmastat.stream_info[i].size) {
2361 +                    total += vmastat.stream_info[i].size;
2362 +                    transferred += vmastat.stream_info[i].transferred;
2363 +                    zero_bytes += vmastat.stream_info[i].zero_bytes;
2364 +                }
2365 +            }
2366 +            percent = (transferred*100)/total;
2367 +            if (percent != last_percent) {
2368 +                fprintf(stderr, "progress %d%% %zd/%zd %zd\n", percent,
2369 +                        transferred, total, zero_bytes);
2370 +                fflush(stderr);
2371 +
2372 +                last_percent = percent;
2373 +            }
2374 +        }
2375 +
2376 +        if (vmastat.closed) {
2377 +            break;
2378 +        }
2379 +    }
2380 +
2381 +    bdrv_drain_all();
2382 +
2383 +    vma_writer_get_status(vmaw, &vmastat);
2384 +
2385 +    if (verbose) {
2386 +        for (i = 0; i < 256; i++) {
2387 +            VmaStreamInfo *si = &vmastat.stream_info[i];
2388 +            if (si->size) {
2389 +                fprintf(stderr, "image %s: size=%zd zeros=%zd saved=%zd\n",
2390 +                        si->devname, si->size, si->zero_bytes,
2391 +                        si->size - si->zero_bytes);
2392 +            }
2393 +        }
2394 +    }
2395 +
2396 +    if (vmastat.status < 0) {
2397 +        unlink(archivename);
2398 +        g_error("creating vma archive failed");
2399 +    }
2400 +
2401 +    return 0;
2402 +}
2403 +
2404 +int main(int argc, char **argv)
2405 +{
2406 +    const char *cmdname;
2407 +
2408 +    error_set_progname(argv[0]);
2409 +
2410 +    qemu_init_main_loop();
2411 +
2412 +    bdrv_init();
2413 +
2414 +    if (argc < 2) {
2415 +        help();
2416 +    }
2417 +
2418 +    cmdname = argv[1];
2419 +    argc--; argv++;
2420 +
2421 +
2422 +    if (!strcmp(cmdname, "list")) {
2423 +        return list_content(argc, argv);
2424 +    } else if (!strcmp(cmdname, "create")) {
2425 +        return create_archive(argc, argv);
2426 +    } else if (!strcmp(cmdname, "extract")) {
2427 +        return extract_content(argc, argv);
2428 +    }
2429 +
2430 +    help();
2431 +    return 0;
2432 +}
2433 diff --git a/vma.h b/vma.h
2434 new file mode 100644
2435 index 0000000..76d0dc8
2436 --- /dev/null
2437 +++ b/vma.h
2438 @@ -0,0 +1,145 @@
2439 +/*
2440 + * VMA: Virtual Machine Archive
2441 + *
2442 + * Copyright (C) Proxmox Server Solutions
2443 + *
2444 + * Authors:
2445 + *  Dietmar Maurer (dietmar@proxmox.com)
2446 + *
2447 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
2448 + * See the COPYING file in the top-level directory.
2449 + *
2450 + */
2451 +
2452 +#ifndef BACKUP_VMA_H
2453 +#define BACKUP_VMA_H
2454 +
2455 +#include "backup.h"
2456 +#include "error.h"
2457 +
2458 +#define VMA_BLOCK_BITS 12
2459 +#define VMA_BLOCK_SIZE (1<<VMA_BLOCK_BITS)
2460 +#define VMA_CLUSTER_BITS (VMA_BLOCK_BITS+4)
2461 +#define VMA_CLUSTER_SIZE (1<<VMA_CLUSTER_BITS)
2462 +
2463 +#if VMA_CLUSTER_SIZE != 65536
2464 +#error unexpected cluster size
2465 +#endif
2466 +
2467 +#define VMA_EXTENT_HEADER_SIZE 512
2468 +#define VMA_BLOCKS_PER_EXTENT 59
2469 +#define VMA_MAX_CONFIGS 256
2470 +
2471 +#define VMA_MAX_EXTENT_SIZE \
2472 +    (VMA_EXTENT_HEADER_SIZE+VMA_CLUSTER_SIZE*VMA_BLOCKS_PER_EXTENT)
2473 +#if VMA_MAX_EXTENT_SIZE != 3867136
2474 +#error unexpected VMA_EXTENT_SIZE
2475 +#endif
2476 +
2477 +/* File Format Definitions */
2478 +
2479 +#define VMA_MAGIC (GUINT32_TO_BE(('V'<<24)|('M'<<16)|('A'<<8)|0x00))
2480 +#define VMA_EXTENT_MAGIC (GUINT32_TO_BE(('V'<<24)|('M'<<16)|('A'<<8)|'E'))
2481 +
2482 +typedef struct VmaDeviceInfoHeader {
2483 +    uint32_t devname_ptr; /* offset into blob_buffer table */
2484 +    uint32_t reserved0;
2485 +    uint64_t size; /* device size in bytes */
2486 +    uint64_t reserved1;
2487 +    uint64_t reserved2;
2488 +} VmaDeviceInfoHeader;
2489 +
2490 +typedef struct VmaHeader {
2491 +    uint32_t magic;
2492 +    uint32_t version;
2493 +    unsigned char uuid[16];
2494 +    int64_t ctime;
2495 +    unsigned char md5sum[16];
2496 +
2497 +    uint32_t blob_buffer_offset;
2498 +    uint32_t blob_buffer_size;
2499 +    uint32_t header_size;
2500 +
2501 +    unsigned char reserved[1984];
2502 +
2503 +    uint32_t config_names[VMA_MAX_CONFIGS]; /* offset into blob_buffer table */
2504 +    uint32_t config_data[VMA_MAX_CONFIGS];  /* offset into blob_buffer table */
2505 +
2506 +    VmaDeviceInfoHeader dev_info[256];
2507 +} VmaHeader;
2508 +
2509 +typedef struct VmaExtentHeader {
2510 +    uint32_t magic;
2511 +    uint16_t reserved1;
2512 +    uint16_t block_count;
2513 +    unsigned char uuid[16];
2514 +    unsigned char md5sum[16];
2515 +    uint64_t blockinfo[VMA_BLOCKS_PER_EXTENT];
2516 +} VmaExtentHeader;
2517 +
2518 +/* functions/definitions to read/write vma files */
2519 +
2520 +typedef struct VmaReader VmaReader;
2521 +
2522 +typedef struct VmaWriter VmaWriter;
2523 +
2524 +typedef struct VmaConfigData {
2525 +    const char *name;
2526 +    const void *data;
2527 +    uint32_t len;
2528 +} VmaConfigData;
2529 +
2530 +typedef struct VmaStreamInfo {
2531 +    uint64_t size;
2532 +    uint64_t cluster_count;
2533 +    uint64_t transferred;
2534 +    uint64_t zero_bytes;
2535 +    int finished;
2536 +    char *devname;
2537 +} VmaStreamInfo;
2538 +
2539 +typedef struct VmaStatus {
2540 +    int status;
2541 +    bool closed;
2542 +    char errmsg[8192];
2543 +    char uuid_str[37];
2544 +    VmaStreamInfo stream_info[256];
2545 +} VmaStatus;
2546 +
2547 +typedef struct VmaDeviceInfo {
2548 +    uint64_t size; /* device size in bytes */
2549 +    const char *devname;
2550 +} VmaDeviceInfo;
2551 +
2552 +extern const BackupDriver backup_vma_driver;
2553 +
2554 +VmaWriter *vma_writer_create(const char *filename, uuid_t uuid, Error **errp);
2555 +int vma_writer_close(VmaWriter *vmaw, Error **errp);
2556 +void vma_writer_destroy(VmaWriter *vmaw);
2557 +int vma_writer_add_config(VmaWriter *vmaw, const char *name, gpointer data,
2558 +                          size_t len);
2559 +int vma_writer_register_stream(VmaWriter *vmaw, const char *devname,
2560 +                               size_t size);
2561 +
2562 +int64_t coroutine_fn vma_writer_write(VmaWriter *vmaw, uint8_t dev_id,
2563 +                                      int64_t cluster_num, unsigned char *buf,
2564 +                                      size_t *zero_bytes);
2565 +
2566 +int coroutine_fn vma_writer_close_stream(VmaWriter *vmaw, uint8_t dev_id);
2567 +
2568 +int vma_writer_get_status(VmaWriter *vmaw, VmaStatus *status);
2569 +void vma_writer_set_error(VmaWriter *vmaw, const char *fmt, ...);
2570 +
2571 +
2572 +VmaReader *vma_reader_create(const char *filename, Error **errp);
2573 +void vma_reader_destroy(VmaReader *vmar);
2574 +VmaHeader *vma_reader_get_header(VmaReader *vmar);
2575 +GList *vma_reader_get_config_data(VmaReader *vmar);
2576 +VmaDeviceInfo *vma_reader_get_device_info(VmaReader *vmar, guint8 dev_id);
2577 +int vma_reader_register_bs(VmaReader *vmar, guint8 dev_id,
2578 +                           BlockDriverState *bs, bool write_zeroes,
2579 +                           Error **errp);
2580 +int vma_reader_restore(VmaReader *vmar, int vmstate_fd, bool verbose,
2581 +                       Error **errp);
2582 +
2583 +#endif /* BACKUP_VMA_H */
2584 --
2585 1.7.2.5
2586