| blob | ffb6108d05cb1f8e40407365ee33e5be6a4b8b83 |
1 From 9cb2f2d61ebf1c28b19bc2df78879431b735f460 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 11/41] introduce new vma archive format
6 This is a very simple archive format, see docs/specs/vma_spec.txt
8 Signed-off-by: Dietmar Maurer <dietmar@proxmox.com>
9 ---
10 Makefile | 3 +-
11 Makefile.objs | 1 +
12 vma-reader.c | 797 +++++++++++++++++++++++++++++++++++++++++++++++++++++
13 vma-writer.c | 870 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
14 vma.c | 585 +++++++++++++++++++++++++++++++++++++++
15 vma.h | 146 ++++++++++
16 6 files changed, 2401 insertions(+), 1 deletion(-)
17 create mode 100644 vma-reader.c
18 create mode 100644 vma-writer.c
19 create mode 100644 vma.c
20 create mode 100644 vma.h
22 diff --git a/Makefile b/Makefile
23 index 50b4b3a..d92d905 100644
24 --- a/Makefile
25 +++ b/Makefile
26 @@ -165,7 +165,7 @@ ifneq ($(wildcard config-host.mak),)
27 include $(SRC_PATH)/tests/Makefile.include
28 endif
30 -all: $(DOCS) $(TOOLS) $(HELPERS-y) recurse-all modules
31 +all: $(DOCS) $(TOOLS) vma$(EXESUF) $(HELPERS-y) recurse-all modules
33 qemu-version.h: FORCE
34 $(call quiet-command, \
35 @@ -256,6 +256,7 @@ qemu-img.o: qemu-img-cmds.h
36 qemu-img$(EXESUF): qemu-img.o $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) libqemuutil.a libqemustub.a
37 qemu-nbd$(EXESUF): qemu-nbd.o $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) libqemuutil.a libqemustub.a
38 qemu-io$(EXESUF): qemu-io.o $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) libqemuutil.a libqemustub.a
39 +vma$(EXESUF): vma.o vma-reader.o $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) libqemuutil.a libqemustub.a
41 qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o libqemuutil.a libqemustub.a
43 diff --git a/Makefile.objs b/Makefile.objs
44 index 6d5ddcf..845edd0 100644
45 --- a/Makefile.objs
46 +++ b/Makefile.objs
47 @@ -15,6 +15,7 @@ block-obj-$(CONFIG_POSIX) += aio-posix.o
48 block-obj-$(CONFIG_WIN32) += aio-win32.o
49 block-obj-y += block/
50 block-obj-y += qemu-io-cmds.o
51 +block-obj-y += vma-writer.o
53 block-obj-m = block/
55 diff --git a/vma-reader.c b/vma-reader.c
56 new file mode 100644
57 index 0000000..51dd8fe
58 --- /dev/null
59 +++ b/vma-reader.c
60 @@ -0,0 +1,797 @@
61 +/*
62 + * VMA: Virtual Machine Archive
63 + *
64 + * Copyright (C) 2012 Proxmox Server Solutions
65 + *
66 + * Authors:
67 + * Dietmar Maurer (dietmar@proxmox.com)
68 + *
69 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
70 + * See the COPYING file in the top-level directory.
71 + *
72 + */
73 +
74 +#include "qemu/osdep.h"
75 +#include <glib.h>
76 +#include <uuid/uuid.h>
77 +
78 +#include "qemu-common.h"
79 +#include "qemu/timer.h"
80 +#include "qemu/ratelimit.h"
81 +#include "vma.h"
82 +#include "block/block.h"
83 +#include "sysemu/block-backend.h"
84 +
85 +static unsigned char zero_vma_block[VMA_BLOCK_SIZE];
86 +
87 +typedef struct VmaRestoreState {
88 + BlockDriverState *bs;
89 + bool write_zeroes;
90 + unsigned long *bitmap;
91 + int bitmap_size;
92 +} VmaRestoreState;
93 +
94 +struct VmaReader {
95 + int fd;
96 + GChecksum *md5csum;
97 + GHashTable *blob_hash;
98 + unsigned char *head_data;
99 + VmaDeviceInfo devinfo[256];
100 + VmaRestoreState rstate[256];
101 + GList *cdata_list;
102 + guint8 vmstate_stream;
103 + uint32_t vmstate_clusters;
104 + /* to show restore percentage if run with -v */
105 + time_t start_time;
106 + int64_t cluster_count;
107 + int64_t clusters_read;
108 + int clusters_read_per;
109 +};
110 +
111 +static guint
112 +g_int32_hash(gconstpointer v)
113 +{
114 + return *(const uint32_t *)v;
115 +}
116 +
117 +static gboolean
118 +g_int32_equal(gconstpointer v1, gconstpointer v2)
119 +{
120 + return *((const uint32_t *)v1) == *((const uint32_t *)v2);
121 +}
122 +
123 +static int vma_reader_get_bitmap(VmaRestoreState *rstate, int64_t cluster_num)
124 +{
125 + assert(rstate);
126 + assert(rstate->bitmap);
127 +
128 + unsigned long val, idx, bit;
129 +
130 + idx = cluster_num / BITS_PER_LONG;
131 +
132 + assert(rstate->bitmap_size > idx);
133 +
134 + bit = cluster_num % BITS_PER_LONG;
135 + val = rstate->bitmap[idx];
136 +
137 + return !!(val & (1UL << bit));
138 +}
139 +
140 +static void vma_reader_set_bitmap(VmaRestoreState *rstate, int64_t cluster_num,
141 + int dirty)
142 +{
143 + assert(rstate);
144 + assert(rstate->bitmap);
145 +
146 + unsigned long val, idx, bit;
147 +
148 + idx = cluster_num / BITS_PER_LONG;
149 +
150 + assert(rstate->bitmap_size > idx);
151 +
152 + bit = cluster_num % BITS_PER_LONG;
153 + val = rstate->bitmap[idx];
154 + if (dirty) {
155 + if (!(val & (1UL << bit))) {
156 + val |= 1UL << bit;
157 + }
158 + } else {
159 + if (val & (1UL << bit)) {
160 + val &= ~(1UL << bit);
161 + }
162 + }
163 + rstate->bitmap[idx] = val;
164 +}
165 +
166 +typedef struct VmaBlob {
167 + uint32_t start;
168 + uint32_t len;
169 + void *data;
170 +} VmaBlob;
171 +
172 +static const VmaBlob *get_header_blob(VmaReader *vmar, uint32_t pos)
173 +{
174 + assert(vmar);
175 + assert(vmar->blob_hash);
176 +
177 + return g_hash_table_lookup(vmar->blob_hash, &pos);
178 +}
179 +
180 +static const char *get_header_str(VmaReader *vmar, uint32_t pos)
181 +{
182 + const VmaBlob *blob = get_header_blob(vmar, pos);
183 + if (!blob) {
184 + return NULL;
185 + }
186 + const char *res = (char *)blob->data;
187 + if (res[blob->len-1] != '\0') {
188 + return NULL;
189 + }
190 + return res;
191 +}
192 +
193 +static ssize_t
194 +safe_read(int fd, unsigned char *buf, size_t count)
195 +{
196 + ssize_t n;
197 +
198 + do {
199 + n = read(fd, buf, count);
200 + } while (n < 0 && errno == EINTR);
201 +
202 + return n;
203 +}
204 +
205 +static ssize_t
206 +full_read(int fd, unsigned char *buf, size_t len)
207 +{
208 + ssize_t n;
209 + size_t total;
210 +
211 + total = 0;
212 +
213 + while (len > 0) {
214 + n = safe_read(fd, buf, len);
215 +
216 + if (n == 0) {
217 + return total;
218 + }
219 +
220 + if (n <= 0) {
221 + break;
222 + }
223 +
224 + buf += n;
225 + total += n;
226 + len -= n;
227 + }
228 +
229 + if (len) {
230 + return -1;
231 + }
232 +
233 + return total;
234 +}
235 +
236 +void vma_reader_destroy(VmaReader *vmar)
237 +{
238 + assert(vmar);
239 +
240 + if (vmar->fd >= 0) {
241 + close(vmar->fd);
242 + }
243 +
244 + if (vmar->cdata_list) {
245 + g_list_free(vmar->cdata_list);
246 + }
247 +
248 + int i;
249 + for (i = 1; i < 256; i++) {
250 + if (vmar->rstate[i].bitmap) {
251 + g_free(vmar->rstate[i].bitmap);
252 + }
253 + }
254 +
255 + if (vmar->md5csum) {
256 + g_checksum_free(vmar->md5csum);
257 + }
258 +
259 + if (vmar->blob_hash) {
260 + g_hash_table_destroy(vmar->blob_hash);
261 + }
262 +
263 + if (vmar->head_data) {
264 + g_free(vmar->head_data);
265 + }
266 +
267 + g_free(vmar);
268 +
269 +};
270 +
271 +static int vma_reader_read_head(VmaReader *vmar, Error **errp)
272 +{
273 + assert(vmar);
274 + assert(errp);
275 + assert(*errp == NULL);
276 +
277 + unsigned char md5sum[16];
278 + int i;
279 + int ret = 0;
280 +
281 + vmar->head_data = g_malloc(sizeof(VmaHeader));
282 +
283 + if (full_read(vmar->fd, vmar->head_data, sizeof(VmaHeader)) !=
284 + sizeof(VmaHeader)) {
285 + error_setg(errp, "can't read vma header - %s",
286 + errno ? g_strerror(errno) : "got EOF");
287 + return -1;
288 + }
289 +
290 + VmaHeader *h = (VmaHeader *)vmar->head_data;
291 +
292 + if (h->magic != VMA_MAGIC) {
293 + error_setg(errp, "not a vma file - wrong magic number");
294 + return -1;
295 + }
296 +
297 + uint32_t header_size = GUINT32_FROM_BE(h->header_size);
298 + int need = header_size - sizeof(VmaHeader);
299 + if (need <= 0) {
300 + error_setg(errp, "wrong vma header size %d", header_size);
301 + return -1;
302 + }
303 +
304 + vmar->head_data = g_realloc(vmar->head_data, header_size);
305 + h = (VmaHeader *)vmar->head_data;
306 +
307 + if (full_read(vmar->fd, vmar->head_data + sizeof(VmaHeader), need) !=
308 + need) {
309 + error_setg(errp, "can't read vma header data - %s",
310 + errno ? g_strerror(errno) : "got EOF");
311 + return -1;
312 + }
313 +
314 + memcpy(md5sum, h->md5sum, 16);
315 + memset(h->md5sum, 0, 16);
316 +
317 + g_checksum_reset(vmar->md5csum);
318 + g_checksum_update(vmar->md5csum, vmar->head_data, header_size);
319 + gsize csize = 16;
320 + g_checksum_get_digest(vmar->md5csum, (guint8 *)(h->md5sum), &csize);
321 +
322 + if (memcmp(md5sum, h->md5sum, 16) != 0) {
323 + error_setg(errp, "wrong vma header chechsum");
324 + return -1;
325 + }
326 +
327 + /* we can modify header data after checksum verify */
328 + h->header_size = header_size;
329 +
330 + h->version = GUINT32_FROM_BE(h->version);
331 + if (h->version != 1) {
332 + error_setg(errp, "wrong vma version %d", h->version);
333 + return -1;
334 + }
335 +
336 + h->ctime = GUINT64_FROM_BE(h->ctime);
337 + h->blob_buffer_offset = GUINT32_FROM_BE(h->blob_buffer_offset);
338 + h->blob_buffer_size = GUINT32_FROM_BE(h->blob_buffer_size);
339 +
340 + uint32_t bstart = h->blob_buffer_offset + 1;
341 + uint32_t bend = h->blob_buffer_offset + h->blob_buffer_size;
342 +
343 + if (bstart <= sizeof(VmaHeader)) {
344 + error_setg(errp, "wrong vma blob buffer offset %d",
345 + h->blob_buffer_offset);
346 + return -1;
347 + }
348 +
349 + if (bend > header_size) {
350 + error_setg(errp, "wrong vma blob buffer size %d/%d",
351 + h->blob_buffer_offset, h->blob_buffer_size);
352 + return -1;
353 + }
354 +
355 + while ((bstart + 2) <= bend) {
356 + uint32_t size = vmar->head_data[bstart] +
357 + (vmar->head_data[bstart+1] << 8);
358 + if ((bstart + size + 2) <= bend) {
359 + VmaBlob *blob = g_new0(VmaBlob, 1);
360 + blob->start = bstart - h->blob_buffer_offset;
361 + blob->len = size;
362 + blob->data = vmar->head_data + bstart + 2;
363 + g_hash_table_insert(vmar->blob_hash, &blob->start, blob);
364 + }
365 + bstart += size + 2;
366 + }
367 +
368 +
369 + int count = 0;
370 + for (i = 1; i < 256; i++) {
371 + VmaDeviceInfoHeader *dih = &h->dev_info[i];
372 + uint32_t devname_ptr = GUINT32_FROM_BE(dih->devname_ptr);
373 + uint64_t size = GUINT64_FROM_BE(dih->size);
374 + const char *devname = get_header_str(vmar, devname_ptr);
375 +
376 + if (size && devname) {
377 + count++;
378 + vmar->devinfo[i].size = size;
379 + vmar->devinfo[i].devname = devname;
380 +
381 + if (strcmp(devname, "vmstate") == 0) {
382 + vmar->vmstate_stream = i;
383 + }
384 + }
385 + }
386 +
387 + if (!count) {
388 + error_setg(errp, "vma does not contain data");
389 + return -1;
390 + }
391 +
392 + for (i = 0; i < VMA_MAX_CONFIGS; i++) {
393 + uint32_t name_ptr = GUINT32_FROM_BE(h->config_names[i]);
394 + uint32_t data_ptr = GUINT32_FROM_BE(h->config_data[i]);
395 +
396 + if (!(name_ptr && data_ptr)) {
397 + continue;
398 + }
399 + const char *name = get_header_str(vmar, name_ptr);
400 + const VmaBlob *blob = get_header_blob(vmar, data_ptr);
401 +
402 + if (!(name && blob)) {
403 + error_setg(errp, "vma contains invalid data pointers");
404 + return -1;
405 + }
406 +
407 + VmaConfigData *cdata = g_new0(VmaConfigData, 1);
408 + cdata->name = name;
409 + cdata->data = blob->data;
410 + cdata->len = blob->len;
411 +
412 + vmar->cdata_list = g_list_append(vmar->cdata_list, cdata);
413 + }
414 +
415 + return ret;
416 +};
417 +
418 +VmaReader *vma_reader_create(const char *filename, Error **errp)
419 +{
420 + assert(filename);
421 + assert(errp);
422 +
423 + VmaReader *vmar = g_new0(VmaReader, 1);
424 +
425 + if (strcmp(filename, "-") == 0) {
426 + vmar->fd = dup(0);
427 + } else {
428 + vmar->fd = open(filename, O_RDONLY);
429 + }
430 +
431 + if (vmar->fd < 0) {
432 + error_setg(errp, "can't open file %s - %s\n", filename,
433 + g_strerror(errno));
434 + goto err;
435 + }
436 +
437 + vmar->md5csum = g_checksum_new(G_CHECKSUM_MD5);
438 + if (!vmar->md5csum) {
439 + error_setg(errp, "can't allocate cmsum\n");
440 + goto err;
441 + }
442 +
443 + vmar->blob_hash = g_hash_table_new_full(g_int32_hash, g_int32_equal,
444 + NULL, g_free);
445 +
446 + if (vma_reader_read_head(vmar, errp) < 0) {
447 + goto err;
448 + }
449 +
450 + return vmar;
451 +
452 +err:
453 + if (vmar) {
454 + vma_reader_destroy(vmar);
455 + }
456 +
457 + return NULL;
458 +}
459 +
460 +VmaHeader *vma_reader_get_header(VmaReader *vmar)
461 +{
462 + assert(vmar);
463 + assert(vmar->head_data);
464 +
465 + return (VmaHeader *)(vmar->head_data);
466 +}
467 +
468 +GList *vma_reader_get_config_data(VmaReader *vmar)
469 +{
470 + assert(vmar);
471 + assert(vmar->head_data);
472 +
473 + return vmar->cdata_list;
474 +}
475 +
476 +VmaDeviceInfo *vma_reader_get_device_info(VmaReader *vmar, guint8 dev_id)
477 +{
478 + assert(vmar);
479 + assert(dev_id);
480 +
481 + if (vmar->devinfo[dev_id].size && vmar->devinfo[dev_id].devname) {
482 + return &vmar->devinfo[dev_id];
483 + }
484 +
485 + return NULL;
486 +}
487 +
488 +int vma_reader_register_bs(VmaReader *vmar, guint8 dev_id, BlockDriverState *bs,
489 + bool write_zeroes, Error **errp)
490 +{
491 + assert(vmar);
492 + assert(bs != NULL);
493 + assert(dev_id);
494 + assert(vmar->rstate[dev_id].bs == NULL);
495 +
496 + int64_t size = bdrv_getlength(bs);
497 + int64_t size_diff = size - vmar->devinfo[dev_id].size;
498 +
499 + /* storage types can have different size restrictions, so it
500 + * is not always possible to create an image with exact size.
501 + * So we tolerate a size difference up to 4MB.
502 + */
503 + if ((size_diff < 0) || (size_diff > 4*1024*1024)) {
504 + error_setg(errp, "vma_reader_register_bs for stream %s failed - "
505 + "unexpected size %zd != %zd", vmar->devinfo[dev_id].devname,
506 + size, vmar->devinfo[dev_id].size);
507 + return -1;
508 + }
509 +
510 + vmar->rstate[dev_id].bs = bs;
511 + vmar->rstate[dev_id].write_zeroes = write_zeroes;
512 +
513 + int64_t bitmap_size = (size/BDRV_SECTOR_SIZE) +
514 + (VMA_CLUSTER_SIZE/BDRV_SECTOR_SIZE) * BITS_PER_LONG - 1;
515 + bitmap_size /= (VMA_CLUSTER_SIZE/BDRV_SECTOR_SIZE) * BITS_PER_LONG;
516 +
517 + vmar->rstate[dev_id].bitmap_size = bitmap_size;
518 + vmar->rstate[dev_id].bitmap = g_new0(unsigned long, bitmap_size);
519 +
520 + vmar->cluster_count += size/VMA_CLUSTER_SIZE;
521 +
522 + return 0;
523 +}
524 +
525 +static ssize_t safe_write(int fd, void *buf, size_t count)
526 +{
527 + ssize_t n;
528 +
529 + do {
530 + n = write(fd, buf, count);
531 + } while (n < 0 && errno == EINTR);
532 +
533 + return n;
534 +}
535 +
536 +static size_t full_write(int fd, void *buf, size_t len)
537 +{
538 + ssize_t n;
539 + size_t total;
540 +
541 + total = 0;
542 +
543 + while (len > 0) {
544 + n = safe_write(fd, buf, len);
545 + if (n < 0) {
546 + return n;
547 + }
548 + buf += n;
549 + total += n;
550 + len -= n;
551 + }
552 +
553 + if (len) {
554 + /* incomplete write ? */
555 + return -1;
556 + }
557 +
558 + return total;
559 +}
560 +
561 +static int restore_write_data(VmaReader *vmar, guint8 dev_id,
562 + BlockDriverState *bs, int vmstate_fd,
563 + unsigned char *buf, int64_t sector_num,
564 + int nb_sectors, Error **errp)
565 +{
566 + assert(vmar);
567 +
568 + if (dev_id == vmar->vmstate_stream) {
569 + if (vmstate_fd >= 0) {
570 + int len = nb_sectors * BDRV_SECTOR_SIZE;
571 + int res = full_write(vmstate_fd, buf, len);
572 + if (res < 0) {
573 + error_setg(errp, "write vmstate failed %d", res);
574 + return -1;
575 + }
576 + }
577 + } else {
578 + int res = bdrv_write(bs, sector_num, buf, nb_sectors);
579 + if (res < 0) {
580 + error_setg(errp, "bdrv_write to %s failed (%d)",
581 + bdrv_get_device_name(bs), res);
582 + return -1;
583 + }
584 + }
585 + return 0;
586 +}
587 +static int restore_extent(VmaReader *vmar, unsigned char *buf,
588 + int extent_size, int vmstate_fd,
589 + bool verbose, Error **errp)
590 +{
591 + assert(vmar);
592 + assert(buf);
593 +
594 + VmaExtentHeader *ehead = (VmaExtentHeader *)buf;
595 + int start = VMA_EXTENT_HEADER_SIZE;
596 + int i;
597 +
598 + for (i = 0; i < VMA_BLOCKS_PER_EXTENT; i++) {
599 + uint64_t block_info = GUINT64_FROM_BE(ehead->blockinfo[i]);
600 + uint64_t cluster_num = block_info & 0xffffffff;
601 + uint8_t dev_id = (block_info >> 32) & 0xff;
602 + uint16_t mask = block_info >> (32+16);
603 + int64_t max_sector;
604 +
605 + if (!dev_id) {
606 + continue;
607 + }
608 +
609 + VmaRestoreState *rstate = &vmar->rstate[dev_id];
610 + BlockDriverState *bs = NULL;
611 +
612 + if (dev_id != vmar->vmstate_stream) {
613 + bs = rstate->bs;
614 + if (!bs) {
615 + error_setg(errp, "got wrong dev id %d", dev_id);
616 + return -1;
617 + }
618 +
619 + if (vma_reader_get_bitmap(rstate, cluster_num)) {
620 + error_setg(errp, "found duplicated cluster %zd for stream %s",
621 + cluster_num, vmar->devinfo[dev_id].devname);
622 + return -1;
623 + }
624 + vma_reader_set_bitmap(rstate, cluster_num, 1);
625 +
626 + max_sector = vmar->devinfo[dev_id].size/BDRV_SECTOR_SIZE;
627 + } else {
628 + max_sector = G_MAXINT64;
629 + if (cluster_num != vmar->vmstate_clusters) {
630 + error_setg(errp, "found out of order vmstate data");
631 + return -1;
632 + }
633 + vmar->vmstate_clusters++;
634 + }
635 +
636 + vmar->clusters_read++;
637 +
638 + if (verbose) {
639 + time_t duration = time(NULL) - vmar->start_time;
640 + int percent = (vmar->clusters_read*100)/vmar->cluster_count;
641 + if (percent != vmar->clusters_read_per) {
642 + printf("progress %d%% (read %zd bytes, duration %zd sec)\n",
643 + percent, vmar->clusters_read*VMA_CLUSTER_SIZE,
644 + duration);
645 + fflush(stdout);
646 + vmar->clusters_read_per = percent;
647 + }
648 + }
649 +
650 + /* try to write whole clusters to speedup restore */
651 + if (mask == 0xffff) {
652 + if ((start + VMA_CLUSTER_SIZE) > extent_size) {
653 + error_setg(errp, "short vma extent - too many blocks");
654 + return -1;
655 + }
656 + int64_t sector_num = (cluster_num * VMA_CLUSTER_SIZE) /
657 + BDRV_SECTOR_SIZE;
658 + int64_t end_sector = sector_num +
659 + VMA_CLUSTER_SIZE/BDRV_SECTOR_SIZE;
660 +
661 + if (end_sector > max_sector) {
662 + end_sector = max_sector;
663 + }
664 +
665 + if (end_sector <= sector_num) {
666 + error_setg(errp, "got wrong block address - write bejond end");
667 + return -1;
668 + }
669 +
670 + int nb_sectors = end_sector - sector_num;
671 + if (restore_write_data(vmar, dev_id, bs, vmstate_fd, buf + start,
672 + sector_num, nb_sectors, errp) < 0) {
673 + return -1;
674 + }
675 +
676 + start += VMA_CLUSTER_SIZE;
677 + } else {
678 + int j;
679 + int bit = 1;
680 +
681 + for (j = 0; j < 16; j++) {
682 + int64_t sector_num = (cluster_num*VMA_CLUSTER_SIZE +
683 + j*VMA_BLOCK_SIZE)/BDRV_SECTOR_SIZE;
684 +
685 + int64_t end_sector = sector_num +
686 + VMA_BLOCK_SIZE/BDRV_SECTOR_SIZE;
687 + if (end_sector > max_sector) {
688 + end_sector = max_sector;
689 + }
690 +
691 + if (mask & bit) {
692 + if ((start + VMA_BLOCK_SIZE) > extent_size) {
693 + error_setg(errp, "short vma extent - too many blocks");
694 + return -1;
695 + }
696 +
697 + if (end_sector <= sector_num) {
698 + error_setg(errp, "got wrong block address - "
699 + "write bejond end");
700 + return -1;
701 + }
702 +
703 + int nb_sectors = end_sector - sector_num;
704 + if (restore_write_data(vmar, dev_id, bs, vmstate_fd,
705 + buf + start, sector_num,
706 + nb_sectors, errp) < 0) {
707 + return -1;
708 + }
709 +
710 + start += VMA_BLOCK_SIZE;
711 +
712 + } else {
713 +
714 + if (rstate->write_zeroes && (end_sector > sector_num)) {
715 + /* Todo: use bdrv_co_write_zeroes (but that need to
716 + * be run inside coroutine?)
717 + */
718 + int nb_sectors = end_sector - sector_num;
719 + if (restore_write_data(vmar, dev_id, bs, vmstate_fd,
720 + zero_vma_block, sector_num,
721 + nb_sectors, errp) < 0) {
722 + return -1;
723 + }
724 + }
725 + }
726 +
727 + bit = bit << 1;
728 + }
729 + }
730 + }
731 +
732 + if (start != extent_size) {
733 + error_setg(errp, "vma extent error - missing blocks");
734 + return -1;
735 + }
736 +
737 + return 0;
738 +}
739 +
740 +int vma_reader_restore(VmaReader *vmar, int vmstate_fd, bool verbose,
741 + Error **errp)
742 +{
743 + assert(vmar);
744 + assert(vmar->head_data);
745 +
746 + int ret = 0;
747 + unsigned char buf[VMA_MAX_EXTENT_SIZE];
748 + int buf_pos = 0;
749 + unsigned char md5sum[16];
750 + VmaHeader *h = (VmaHeader *)vmar->head_data;
751 +
752 + vmar->start_time = time(NULL);
753 +
754 + while (1) {
755 + int bytes = full_read(vmar->fd, buf + buf_pos, sizeof(buf) - buf_pos);
756 + if (bytes < 0) {
757 + error_setg(errp, "read failed - %s", g_strerror(errno));
758 + return -1;
759 + }
760 +
761 + buf_pos += bytes;
762 +
763 + if (!buf_pos) {
764 + break; /* EOF */
765 + }
766 +
767 + if (buf_pos < VMA_EXTENT_HEADER_SIZE) {
768 + error_setg(errp, "read short extent (%d bytes)", buf_pos);
769 + return -1;
770 + }
771 +
772 + VmaExtentHeader *ehead = (VmaExtentHeader *)buf;
773 +
774 + /* extract md5sum */
775 + memcpy(md5sum, ehead->md5sum, sizeof(ehead->md5sum));
776 + memset(ehead->md5sum, 0, sizeof(ehead->md5sum));
777 +
778 + g_checksum_reset(vmar->md5csum);
779 + g_checksum_update(vmar->md5csum, buf, VMA_EXTENT_HEADER_SIZE);
780 + gsize csize = 16;
781 + g_checksum_get_digest(vmar->md5csum, ehead->md5sum, &csize);
782 +
783 + if (memcmp(md5sum, ehead->md5sum, 16) != 0) {
784 + error_setg(errp, "wrong vma extent header chechsum");
785 + return -1;
786 + }
787 +
788 + if (memcmp(h->uuid, ehead->uuid, sizeof(ehead->uuid)) != 0) {
789 + error_setg(errp, "wrong vma extent uuid");
790 + return -1;
791 + }
792 +
793 + if (ehead->magic != VMA_EXTENT_MAGIC || ehead->reserved1 != 0) {
794 + error_setg(errp, "wrong vma extent header magic");
795 + return -1;
796 + }
797 +
798 + int block_count = GUINT16_FROM_BE(ehead->block_count);
799 + int extent_size = VMA_EXTENT_HEADER_SIZE + block_count*VMA_BLOCK_SIZE;
800 +
801 + if (buf_pos < extent_size) {
802 + error_setg(errp, "short vma extent (%d < %d)", buf_pos,
803 + extent_size);
804 + return -1;
805 + }
806 +
807 + if (restore_extent(vmar, buf, extent_size, vmstate_fd, verbose,
808 + errp) < 0) {
809 + return -1;
810 + }
811 +
812 + if (buf_pos > extent_size) {
813 + memmove(buf, buf + extent_size, buf_pos - extent_size);
814 + buf_pos = buf_pos - extent_size;
815 + } else {
816 + buf_pos = 0;
817 + }
818 + }
819 +
820 + bdrv_drain_all();
821 +
822 + int i;
823 + for (i = 1; i < 256; i++) {
824 + VmaRestoreState *rstate = &vmar->rstate[i];
825 + if (!rstate->bs) {
826 + continue;
827 + }
828 +
829 + if (bdrv_flush(rstate->bs) < 0) {
830 + error_setg(errp, "vma bdrv_flush %s failed",
831 + vmar->devinfo[i].devname);
832 + return -1;
833 + }
834 +
835 + if (vmar->devinfo[i].size &&
836 + (strcmp(vmar->devinfo[i].devname, "vmstate") != 0)) {
837 + assert(rstate->bitmap);
838 +
839 + int64_t cluster_num, end;
840 +
841 + end = (vmar->devinfo[i].size + VMA_CLUSTER_SIZE - 1) /
842 + VMA_CLUSTER_SIZE;
843 +
844 + for (cluster_num = 0; cluster_num < end; cluster_num++) {
845 + if (!vma_reader_get_bitmap(rstate, cluster_num)) {
846 + error_setg(errp, "detected missing cluster %zd "
847 + "for stream %s", cluster_num,
848 + vmar->devinfo[i].devname);
849 + return -1;
850 + }
851 + }
852 + }
853 + }
854 +
855 + return ret;
856 +}
857 +
858 diff --git a/vma-writer.c b/vma-writer.c
859 new file mode 100644
860 index 0000000..b0cf529
861 --- /dev/null
862 +++ b/vma-writer.c
863 @@ -0,0 +1,870 @@
864 +/*
865 + * VMA: Virtual Machine Archive
866 + *
867 + * Copyright (C) 2012 Proxmox Server Solutions
868 + *
869 + * Authors:
870 + * Dietmar Maurer (dietmar@proxmox.com)
871 + *
872 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
873 + * See the COPYING file in the top-level directory.
874 + *
875 + */
876 +
877 +#include "qemu/osdep.h"
878 +#include <glib.h>
879 +#include <uuid/uuid.h>
880 +
881 +#include "vma.h"
882 +#include "block/block.h"
883 +#include "monitor/monitor.h"
884 +#include "qemu/main-loop.h"
885 +#include "qemu/coroutine.h"
886 +#include "qemu/cutils.h"
887 +
888 +#define DEBUG_VMA 0
889 +
890 +#define DPRINTF(fmt, ...)\
891 + do { if (DEBUG_VMA) { printf("vma: " fmt, ## __VA_ARGS__); } } while (0)
892 +
893 +#define WRITE_BUFFERS 5
894 +
895 +typedef struct VmaAIOCB VmaAIOCB;
896 +struct VmaAIOCB {
897 + unsigned char buffer[VMA_MAX_EXTENT_SIZE];
898 + VmaWriter *vmaw;
899 + size_t bytes;
900 + Coroutine *co;
901 +};
902 +
903 +struct VmaWriter {
904 + int fd;
905 + FILE *cmd;
906 + int status;
907 + char errmsg[8192];
908 + uuid_t uuid;
909 + bool header_written;
910 + bool closed;
911 +
912 + /* we always write extents */
913 + unsigned char outbuf[VMA_MAX_EXTENT_SIZE];
914 + int outbuf_pos; /* in bytes */
915 + int outbuf_count; /* in VMA_BLOCKS */
916 + uint64_t outbuf_block_info[VMA_BLOCKS_PER_EXTENT];
917 +
918 + VmaAIOCB *aiocbs[WRITE_BUFFERS];
919 + CoQueue wqueue;
920 +
921 + GChecksum *md5csum;
922 + CoMutex writer_lock;
923 + CoMutex flush_lock;
924 + Coroutine *co_writer;
925 +
926 + /* drive informations */
927 + VmaStreamInfo stream_info[256];
928 + guint stream_count;
929 +
930 + guint8 vmstate_stream;
931 + uint32_t vmstate_clusters;
932 +
933 + /* header blob table */
934 + char *header_blob_table;
935 + uint32_t header_blob_table_size;
936 + uint32_t header_blob_table_pos;
937 +
938 + /* store for config blobs */
939 + uint32_t config_names[VMA_MAX_CONFIGS]; /* offset into blob_buffer table */
940 + uint32_t config_data[VMA_MAX_CONFIGS]; /* offset into blob_buffer table */
941 + uint32_t config_count;
942 +};
943 +
944 +void vma_writer_set_error(VmaWriter *vmaw, const char *fmt, ...)
945 +{
946 + va_list ap;
947 +
948 + if (vmaw->status < 0) {
949 + return;
950 + }
951 +
952 + vmaw->status = -1;
953 +
954 + va_start(ap, fmt);
955 + g_vsnprintf(vmaw->errmsg, sizeof(vmaw->errmsg), fmt, ap);
956 + va_end(ap);
957 +
958 + DPRINTF("vma_writer_set_error: %s\n", vmaw->errmsg);
959 +}
960 +
961 +static uint32_t allocate_header_blob(VmaWriter *vmaw, const char *data,
962 + size_t len)
963 +{
964 + if (len > 65535) {
965 + return 0;
966 + }
967 +
968 + if (!vmaw->header_blob_table ||
969 + (vmaw->header_blob_table_size <
970 + (vmaw->header_blob_table_pos + len + 2))) {
971 + int newsize = vmaw->header_blob_table_size + ((len + 2 + 511)/512)*512;
972 +
973 + vmaw->header_blob_table = g_realloc(vmaw->header_blob_table, newsize);
974 + memset(vmaw->header_blob_table + vmaw->header_blob_table_size,
975 + 0, newsize - vmaw->header_blob_table_size);
976 + vmaw->header_blob_table_size = newsize;
977 + }
978 +
979 + uint32_t cpos = vmaw->header_blob_table_pos;
980 + vmaw->header_blob_table[cpos] = len & 255;
981 + vmaw->header_blob_table[cpos+1] = (len >> 8) & 255;
982 + memcpy(vmaw->header_blob_table + cpos + 2, data, len);
983 + vmaw->header_blob_table_pos += len + 2;
984 + return cpos;
985 +}
986 +
987 +static uint32_t allocate_header_string(VmaWriter *vmaw, const char *str)
988 +{
989 + assert(vmaw);
990 +
991 + size_t len = strlen(str) + 1;
992 +
993 + return allocate_header_blob(vmaw, str, len);
994 +}
995 +
996 +int vma_writer_add_config(VmaWriter *vmaw, const char *name, gpointer data,
997 + gsize len)
998 +{
999 + assert(vmaw);
1000 + assert(!vmaw->header_written);
1001 + assert(vmaw->config_count < VMA_MAX_CONFIGS);
1002 + assert(name);
1003 + assert(data);
1004 + assert(len);
1005 +
1006 + gchar *basename = g_path_get_basename(name);
1007 + uint32_t name_ptr = allocate_header_string(vmaw, basename);
1008 + g_free(basename);
1009 +
1010 + if (!name_ptr) {
1011 + return -1;
1012 + }
1013 +
1014 + uint32_t data_ptr = allocate_header_blob(vmaw, data, len);
1015 + if (!data_ptr) {
1016 + return -1;
1017 + }
1018 +
1019 + vmaw->config_names[vmaw->config_count] = name_ptr;
1020 + vmaw->config_data[vmaw->config_count] = data_ptr;
1021 +
1022 + vmaw->config_count++;
1023 +
1024 + return 0;
1025 +}
1026 +
1027 +int vma_writer_register_stream(VmaWriter *vmaw, const char *devname,
1028 + size_t size)
1029 +{
1030 + assert(vmaw);
1031 + assert(devname);
1032 + assert(!vmaw->status);
1033 +
1034 + if (vmaw->header_written) {
1035 + vma_writer_set_error(vmaw, "vma_writer_register_stream: header "
1036 + "already written");
1037 + return -1;
1038 + }
1039 +
1040 + guint n = vmaw->stream_count + 1;
1041 +
1042 + /* we can have dev_ids form 1 to 255 (0 reserved)
1043 + * 255(-1) reseverd for safety
1044 + */
1045 + if (n > 254) {
1046 + vma_writer_set_error(vmaw, "vma_writer_register_stream: "
1047 + "too many drives");
1048 + return -1;
1049 + }
1050 +
1051 + if (size <= 0) {
1052 + vma_writer_set_error(vmaw, "vma_writer_register_stream: "
1053 + "got strange size %zd", size);
1054 + return -1;
1055 + }
1056 +
1057 + DPRINTF("vma_writer_register_stream %s %zu %d\n", devname, size, n);
1058 +
1059 + vmaw->stream_info[n].devname = g_strdup(devname);
1060 + vmaw->stream_info[n].size = size;
1061 +
1062 + vmaw->stream_info[n].cluster_count = (size + VMA_CLUSTER_SIZE - 1) /
1063 + VMA_CLUSTER_SIZE;
1064 +
1065 + vmaw->stream_count = n;
1066 +
1067 + if (strcmp(devname, "vmstate") == 0) {
1068 + vmaw->vmstate_stream = n;
1069 + }
1070 +
1071 + return n;
1072 +}
1073 +
1074 +static void vma_co_continue_write(void *opaque)
1075 +{
1076 + VmaWriter *vmaw = opaque;
1077 +
1078 + DPRINTF("vma_co_continue_write\n");
1079 + qemu_coroutine_enter(vmaw->co_writer);
1080 +}
1081 +
1082 +static ssize_t coroutine_fn
1083 +vma_co_write(VmaWriter *vmaw, const void *buf, size_t bytes)
1084 +{
1085 + size_t done = 0;
1086 + ssize_t ret;
1087 +
1088 + /* atomic writes (we cannot interleave writes) */
1089 + qemu_co_mutex_lock(&vmaw->writer_lock);
1090 +
1091 + DPRINTF("vma_co_write enter %zd\n", bytes);
1092 +
1093 + assert(vmaw->co_writer == NULL);
1094 +
1095 + vmaw->co_writer = qemu_coroutine_self();
1096 +
1097 + aio_set_fd_handler(qemu_get_aio_context(), vmaw->fd, false, NULL, vma_co_continue_write, vmaw);
1098 +
1099 + DPRINTF("vma_co_write wait until writable\n");
1100 + qemu_coroutine_yield();
1101 + DPRINTF("vma_co_write starting %zd\n", bytes);
1102 +
1103 + while (done < bytes) {
1104 + ret = write(vmaw->fd, buf + done, bytes - done);
1105 + if (ret > 0) {
1106 + done += ret;
1107 + DPRINTF("vma_co_write written %zd %zd\n", done, ret);
1108 + } else if (ret < 0) {
1109 + if (errno == EAGAIN || errno == EWOULDBLOCK) {
1110 + DPRINTF("vma_co_write yield %zd\n", done);
1111 + qemu_coroutine_yield();
1112 + DPRINTF("vma_co_write restart %zd\n", done);
1113 + } else {
1114 + vma_writer_set_error(vmaw, "vma_co_write write error - %s",
1115 + g_strerror(errno));
1116 + done = -1; /* always return failure for partial writes */
1117 + break;
1118 + }
1119 + } else if (ret == 0) {
1120 + /* should not happen - simply try again */
1121 + }
1122 + }
1123 +
1124 + aio_set_fd_handler(qemu_get_aio_context(), vmaw->fd, false, NULL, NULL, NULL);
1125 +
1126 + vmaw->co_writer = NULL;
1127 +
1128 + qemu_co_mutex_unlock(&vmaw->writer_lock);
1129 +
1130 + DPRINTF("vma_co_write leave %zd\n", done);
1131 + return done;
1132 +}
1133 +
1134 +static void coroutine_fn vma_co_writer_task(void *opaque)
1135 +{
1136 + VmaAIOCB *cb = opaque;
1137 +
1138 + DPRINTF("vma_co_writer_task start\n");
1139 +
1140 + int64_t done = vma_co_write(cb->vmaw, cb->buffer, cb->bytes);
1141 + DPRINTF("vma_co_writer_task write done %zd\n", done);
1142 +
1143 + if (done != cb->bytes) {
1144 + DPRINTF("vma_co_writer_task failed write %zd %zd", cb->bytes, done);
1145 + vma_writer_set_error(cb->vmaw, "vma_co_writer_task failed write %zd",
1146 + done);
1147 + }
1148 +
1149 + cb->bytes = 0;
1150 +
1151 + qemu_co_queue_next(&cb->vmaw->wqueue);
1152 +
1153 + DPRINTF("vma_co_writer_task end\n");
1154 +}
1155 +
1156 +static void coroutine_fn vma_queue_flush(VmaWriter *vmaw)
1157 +{
1158 + DPRINTF("vma_queue_flush enter\n");
1159 +
1160 + assert(vmaw);
1161 +
1162 + while (1) {
1163 + int i;
1164 + VmaAIOCB *cb = NULL;
1165 + for (i = 0; i < WRITE_BUFFERS; i++) {
1166 + if (vmaw->aiocbs[i]->bytes) {
1167 + cb = vmaw->aiocbs[i];
1168 + DPRINTF("FOUND USED AIO BUFFER %d %zd\n", i,
1169 + vmaw->aiocbs[i]->bytes);
1170 + break;
1171 + }
1172 + }
1173 + if (!cb) {
1174 + break;
1175 + }
1176 + qemu_co_queue_wait(&vmaw->wqueue);
1177 + }
1178 +
1179 + DPRINTF("vma_queue_flush leave\n");
1180 +}
1181 +
1182 +/**
1183 + * NOTE: pipe buffer size in only 4096 bytes on linux (see 'ulimit -a')
1184 + * So we need to create a coroutione to allow 'parallel' execution.
1185 + */
1186 +static ssize_t coroutine_fn
1187 +vma_queue_write(VmaWriter *vmaw, const void *buf, size_t bytes)
1188 +{
1189 + DPRINTF("vma_queue_write enter %zd\n", bytes);
1190 +
1191 + assert(vmaw);
1192 + assert(buf);
1193 + assert(bytes <= VMA_MAX_EXTENT_SIZE);
1194 +
1195 + VmaAIOCB *cb = NULL;
1196 + while (!cb) {
1197 + int i;
1198 + for (i = 0; i < WRITE_BUFFERS; i++) {
1199 + if (!vmaw->aiocbs[i]->bytes) {
1200 + cb = vmaw->aiocbs[i];
1201 + break;
1202 + }
1203 + }
1204 + if (!cb) {
1205 + qemu_co_queue_wait(&vmaw->wqueue);
1206 + }
1207 + }
1208 +
1209 + memcpy(cb->buffer, buf, bytes);
1210 + cb->bytes = bytes;
1211 + cb->vmaw = vmaw;
1212 +
1213 + DPRINTF("vma_queue_write start %zd\n", bytes);
1214 + cb->co = qemu_coroutine_create(vma_co_writer_task);
1215 + qemu_coroutine_enter(cb->co, cb);
1216 +
1217 + DPRINTF("vma_queue_write leave\n");
1218 +
1219 + return bytes;
1220 +}
1221 +
1222 +VmaWriter *vma_writer_create(const char *filename, uuid_t uuid, Error **errp)
1223 +{
1224 + const char *p;
1225 +
1226 + assert(sizeof(VmaHeader) == (4096 + 8192));
1227 + assert(G_STRUCT_OFFSET(VmaHeader, config_names) == 2044);
1228 + assert(G_STRUCT_OFFSET(VmaHeader, config_data) == 3068);
1229 + assert(G_STRUCT_OFFSET(VmaHeader, dev_info) == 4096);
1230 + assert(sizeof(VmaExtentHeader) == 512);
1231 +
1232 + VmaWriter *vmaw = g_new0(VmaWriter, 1);
1233 + vmaw->fd = -1;
1234 +
1235 + vmaw->md5csum = g_checksum_new(G_CHECKSUM_MD5);
1236 + if (!vmaw->md5csum) {
1237 + error_setg(errp, "can't allocate cmsum\n");
1238 + goto err;
1239 + }
1240 +
1241 + if (strstart(filename, "exec:", &p)) {
1242 + vmaw->cmd = popen(p, "w");
1243 + if (vmaw->cmd == NULL) {
1244 + error_setg(errp, "can't popen command '%s' - %s\n", p,
1245 + g_strerror(errno));
1246 + goto err;
1247 + }
1248 + vmaw->fd = fileno(vmaw->cmd);
1249 +
1250 + /* try to use O_NONBLOCK and O_DIRECT */
1251 + fcntl(vmaw->fd, F_SETFL, fcntl(vmaw->fd, F_GETFL)|O_NONBLOCK);
1252 + fcntl(vmaw->fd, F_SETFL, fcntl(vmaw->fd, F_GETFL)|O_DIRECT);
1253 +
1254 + } else {
1255 + struct stat st;
1256 + int oflags;
1257 + const char *tmp_id_str;
1258 +
1259 + if ((stat(filename, &st) == 0) && S_ISFIFO(st.st_mode)) {
1260 + oflags = O_NONBLOCK|O_DIRECT|O_WRONLY;
1261 + vmaw->fd = qemu_open(filename, oflags, 0644);
1262 + } else if (strstart(filename, "/dev/fdset/", &tmp_id_str)) {
1263 + oflags = O_NONBLOCK|O_DIRECT|O_WRONLY;
1264 + vmaw->fd = qemu_open(filename, oflags, 0644);
1265 + } else if (strstart(filename, "/dev/fdname/", &tmp_id_str)) {
1266 + vmaw->fd = monitor_get_fd(cur_mon, tmp_id_str, errp);
1267 + if (vmaw->fd < 0) {
1268 + goto err;
1269 + }
1270 + /* try to use O_NONBLOCK and O_DIRECT */
1271 + fcntl(vmaw->fd, F_SETFL, fcntl(vmaw->fd, F_GETFL)|O_NONBLOCK);
1272 + fcntl(vmaw->fd, F_SETFL, fcntl(vmaw->fd, F_GETFL)|O_DIRECT);
1273 + } else {
1274 + oflags = O_NONBLOCK|O_DIRECT|O_WRONLY|O_CREAT|O_EXCL;
1275 + vmaw->fd = qemu_open(filename, oflags, 0644);
1276 + }
1277 +
1278 + if (vmaw->fd < 0) {
1279 + error_setg(errp, "can't open file %s - %s\n", filename,
1280 + g_strerror(errno));
1281 + goto err;
1282 + }
1283 + }
1284 +
1285 + /* we use O_DIRECT, so we need to align IO buffers */
1286 + int i;
1287 + for (i = 0; i < WRITE_BUFFERS; i++) {
1288 + vmaw->aiocbs[i] = qemu_memalign(512, sizeof(VmaAIOCB));
1289 + memset(vmaw->aiocbs[i], 0, sizeof(VmaAIOCB));
1290 + }
1291 +
1292 + vmaw->outbuf_count = 0;
1293 + vmaw->outbuf_pos = VMA_EXTENT_HEADER_SIZE;
1294 +
1295 + vmaw->header_blob_table_pos = 1; /* start at pos 1 */
1296 +
1297 + qemu_co_mutex_init(&vmaw->writer_lock);
1298 + qemu_co_mutex_init(&vmaw->flush_lock);
1299 + qemu_co_queue_init(&vmaw->wqueue);
1300 +
1301 + uuid_copy(vmaw->uuid, uuid);
1302 +
1303 + return vmaw;
1304 +
1305 +err:
1306 + if (vmaw) {
1307 + if (vmaw->cmd) {
1308 + pclose(vmaw->cmd);
1309 + } else if (vmaw->fd >= 0) {
1310 + close(vmaw->fd);
1311 + }
1312 +
1313 + if (vmaw->md5csum) {
1314 + g_checksum_free(vmaw->md5csum);
1315 + }
1316 +
1317 + g_free(vmaw);
1318 + }
1319 +
1320 + return NULL;
1321 +}
1322 +
1323 +static int coroutine_fn vma_write_header(VmaWriter *vmaw)
1324 +{
1325 + assert(vmaw);
1326 + int header_clusters = 8;
1327 + char buf[65536*header_clusters];
1328 + VmaHeader *head = (VmaHeader *)buf;
1329 +
1330 + int i;
1331 +
1332 + DPRINTF("VMA WRITE HEADER\n");
1333 +
1334 + if (vmaw->status < 0) {
1335 + return vmaw->status;
1336 + }
1337 +
1338 + memset(buf, 0, sizeof(buf));
1339 +
1340 + head->magic = VMA_MAGIC;
1341 + head->version = GUINT32_TO_BE(1); /* v1 */
1342 + memcpy(head->uuid, vmaw->uuid, 16);
1343 +
1344 + time_t ctime = time(NULL);
1345 + head->ctime = GUINT64_TO_BE(ctime);
1346 +
1347 + if (!vmaw->stream_count) {
1348 + return -1;
1349 + }
1350 +
1351 + for (i = 0; i < VMA_MAX_CONFIGS; i++) {
1352 + head->config_names[i] = GUINT32_TO_BE(vmaw->config_names[i]);
1353 + head->config_data[i] = GUINT32_TO_BE(vmaw->config_data[i]);
1354 + }
1355 +
1356 + /* 32 bytes per device (12 used currently) = 8192 bytes max */
1357 + for (i = 1; i <= 254; i++) {
1358 + VmaStreamInfo *si = &vmaw->stream_info[i];
1359 + if (si->size) {
1360 + assert(si->devname);
1361 + uint32_t devname_ptr = allocate_header_string(vmaw, si->devname);
1362 + if (!devname_ptr) {
1363 + return -1;
1364 + }
1365 + head->dev_info[i].devname_ptr = GUINT32_TO_BE(devname_ptr);
1366 + head->dev_info[i].size = GUINT64_TO_BE(si->size);
1367 + }
1368 + }
1369 +
1370 + uint32_t header_size = sizeof(VmaHeader) + vmaw->header_blob_table_size;
1371 + head->header_size = GUINT32_TO_BE(header_size);
1372 +
1373 + if (header_size > sizeof(buf)) {
1374 + return -1; /* just to be sure */
1375 + }
1376 +
1377 + uint32_t blob_buffer_offset = sizeof(VmaHeader);
1378 + memcpy(buf + blob_buffer_offset, vmaw->header_blob_table,
1379 + vmaw->header_blob_table_size);
1380 + head->blob_buffer_offset = GUINT32_TO_BE(blob_buffer_offset);
1381 + head->blob_buffer_size = GUINT32_TO_BE(vmaw->header_blob_table_pos);
1382 +
1383 + g_checksum_reset(vmaw->md5csum);
1384 + g_checksum_update(vmaw->md5csum, (const guchar *)buf, header_size);
1385 + gsize csize = 16;
1386 + g_checksum_get_digest(vmaw->md5csum, (guint8 *)(head->md5sum), &csize);
1387 +
1388 + return vma_queue_write(vmaw, buf, header_size);
1389 +}
1390 +
1391 +static int coroutine_fn vma_writer_flush(VmaWriter *vmaw)
1392 +{
1393 + assert(vmaw);
1394 +
1395 + int ret;
1396 + int i;
1397 +
1398 + if (vmaw->status < 0) {
1399 + return vmaw->status;
1400 + }
1401 +
1402 + if (!vmaw->header_written) {
1403 + vmaw->header_written = true;
1404 + ret = vma_write_header(vmaw);
1405 + if (ret < 0) {
1406 + vma_writer_set_error(vmaw, "vma_writer_flush: write header failed");
1407 + return ret;
1408 + }
1409 + }
1410 +
1411 + DPRINTF("VMA WRITE FLUSH %d %d\n", vmaw->outbuf_count, vmaw->outbuf_pos);
1412 +
1413 +
1414 + VmaExtentHeader *ehead = (VmaExtentHeader *)vmaw->outbuf;
1415 +
1416 + ehead->magic = VMA_EXTENT_MAGIC;
1417 + ehead->reserved1 = 0;
1418 +
1419 + for (i = 0; i < VMA_BLOCKS_PER_EXTENT; i++) {
1420 + ehead->blockinfo[i] = GUINT64_TO_BE(vmaw->outbuf_block_info[i]);
1421 + }
1422 +
1423 + guint16 block_count = (vmaw->outbuf_pos - VMA_EXTENT_HEADER_SIZE) /
1424 + VMA_BLOCK_SIZE;
1425 +
1426 + ehead->block_count = GUINT16_TO_BE(block_count);
1427 +
1428 + memcpy(ehead->uuid, vmaw->uuid, sizeof(ehead->uuid));
1429 + memset(ehead->md5sum, 0, sizeof(ehead->md5sum));
1430 +
1431 + g_checksum_reset(vmaw->md5csum);
1432 + g_checksum_update(vmaw->md5csum, vmaw->outbuf, VMA_EXTENT_HEADER_SIZE);
1433 + gsize csize = 16;
1434 + g_checksum_get_digest(vmaw->md5csum, ehead->md5sum, &csize);
1435 +
1436 + int bytes = vmaw->outbuf_pos;
1437 + ret = vma_queue_write(vmaw, vmaw->outbuf, bytes);
1438 + if (ret != bytes) {
1439 + vma_writer_set_error(vmaw, "vma_writer_flush: failed write");
1440 + }
1441 +
1442 + vmaw->outbuf_count = 0;
1443 + vmaw->outbuf_pos = VMA_EXTENT_HEADER_SIZE;
1444 +
1445 + for (i = 0; i < VMA_BLOCKS_PER_EXTENT; i++) {
1446 + vmaw->outbuf_block_info[i] = 0;
1447 + }
1448 +
1449 + return vmaw->status;
1450 +}
1451 +
1452 +static int vma_count_open_streams(VmaWriter *vmaw)
1453 +{
1454 + g_assert(vmaw != NULL);
1455 +
1456 + int i;
1457 + int open_drives = 0;
1458 + for (i = 0; i <= 255; i++) {
1459 + if (vmaw->stream_info[i].size && !vmaw->stream_info[i].finished) {
1460 + open_drives++;
1461 + }
1462 + }
1463 +
1464 + return open_drives;
1465 +}
1466 +
1467 +/**
1468 + * all jobs should call this when there is no more data
1469 + * Returns: number of remaining stream (0 ==> finished)
1470 + */
1471 +int coroutine_fn
1472 +vma_writer_close_stream(VmaWriter *vmaw, uint8_t dev_id)
1473 +{
1474 + g_assert(vmaw != NULL);
1475 +
1476 + DPRINTF("vma_writer_set_status %d\n", dev_id);
1477 + if (!vmaw->stream_info[dev_id].size) {
1478 + vma_writer_set_error(vmaw, "vma_writer_close_stream: "
1479 + "no such stream %d", dev_id);
1480 + return -1;
1481 + }
1482 + if (vmaw->stream_info[dev_id].finished) {
1483 + vma_writer_set_error(vmaw, "vma_writer_close_stream: "
1484 + "stream already closed %d", dev_id);
1485 + return -1;
1486 + }
1487 +
1488 + vmaw->stream_info[dev_id].finished = true;
1489 +
1490 + int open_drives = vma_count_open_streams(vmaw);
1491 +
1492 + if (open_drives <= 0) {
1493 + DPRINTF("vma_writer_set_status all drives completed\n");
1494 + qemu_co_mutex_lock(&vmaw->flush_lock);
1495 + int ret = vma_writer_flush(vmaw);
1496 + qemu_co_mutex_unlock(&vmaw->flush_lock);
1497 + if (ret < 0) {
1498 + vma_writer_set_error(vmaw, "vma_writer_close_stream: flush failed");
1499 + }
1500 + }
1501 +
1502 + return open_drives;
1503 +}
1504 +
1505 +int vma_writer_get_status(VmaWriter *vmaw, VmaStatus *status)
1506 +{
1507 + int i;
1508 +
1509 + g_assert(vmaw != NULL);
1510 +
1511 + if (status) {
1512 + status->status = vmaw->status;
1513 + g_strlcpy(status->errmsg, vmaw->errmsg, sizeof(status->errmsg));
1514 + for (i = 0; i <= 255; i++) {
1515 + status->stream_info[i] = vmaw->stream_info[i];
1516 + }
1517 +
1518 + uuid_unparse_lower(vmaw->uuid, status->uuid_str);
1519 + }
1520 +
1521 + status->closed = vmaw->closed;
1522 +
1523 + return vmaw->status;
1524 +}
1525 +
1526 +static int vma_writer_get_buffer(VmaWriter *vmaw)
1527 +{
1528 + int ret = 0;
1529 +
1530 + qemu_co_mutex_lock(&vmaw->flush_lock);
1531 +
1532 + /* wait until buffer is available */
1533 + while (vmaw->outbuf_count >= (VMA_BLOCKS_PER_EXTENT - 1)) {
1534 + ret = vma_writer_flush(vmaw);
1535 + if (ret < 0) {
1536 + vma_writer_set_error(vmaw, "vma_writer_get_buffer: flush failed");
1537 + break;
1538 + }
1539 + }
1540 +
1541 + qemu_co_mutex_unlock(&vmaw->flush_lock);
1542 +
1543 + return ret;
1544 +}
1545 +
1546 +
1547 +int64_t coroutine_fn
1548 +vma_writer_write(VmaWriter *vmaw, uint8_t dev_id, int64_t cluster_num,
1549 + unsigned char *buf, size_t *zero_bytes)
1550 +{
1551 + g_assert(vmaw != NULL);
1552 + g_assert(zero_bytes != NULL);
1553 +
1554 + *zero_bytes = 0;
1555 +
1556 + if (vmaw->status < 0) {
1557 + return vmaw->status;
1558 + }
1559 +
1560 + if (!dev_id || !vmaw->stream_info[dev_id].size) {
1561 + vma_writer_set_error(vmaw, "vma_writer_write: "
1562 + "no such stream %d", dev_id);
1563 + return -1;
1564 + }
1565 +
1566 + if (vmaw->stream_info[dev_id].finished) {
1567 + vma_writer_set_error(vmaw, "vma_writer_write: "
1568 + "stream already closed %d", dev_id);
1569 + return -1;
1570 + }
1571 +
1572 +
1573 + if (cluster_num >= (((uint64_t)1)<<32)) {
1574 + vma_writer_set_error(vmaw, "vma_writer_write: "
1575 + "cluster number out of range");
1576 + return -1;
1577 + }
1578 +
1579 + if (dev_id == vmaw->vmstate_stream) {
1580 + if (cluster_num != vmaw->vmstate_clusters) {
1581 + vma_writer_set_error(vmaw, "vma_writer_write: "
1582 + "non sequential vmstate write");
1583 + }
1584 + vmaw->vmstate_clusters++;
1585 + } else if (cluster_num >= vmaw->stream_info[dev_id].cluster_count) {
1586 + vma_writer_set_error(vmaw, "vma_writer_write: cluster number too big");
1587 + return -1;
1588 + }
1589 +
1590 + /* wait until buffer is available */
1591 + if (vma_writer_get_buffer(vmaw) < 0) {
1592 + vma_writer_set_error(vmaw, "vma_writer_write: "
1593 + "vma_writer_get_buffer failed");
1594 + return -1;
1595 + }
1596 +
1597 + DPRINTF("VMA WRITE %d %zd\n", dev_id, cluster_num);
1598 +
1599 + uint16_t mask = 0;
1600 +
1601 + if (buf) {
1602 + int i;
1603 + int bit = 1;
1604 + for (i = 0; i < 16; i++) {
1605 + unsigned char *vmablock = buf + (i*VMA_BLOCK_SIZE);
1606 + if (!buffer_is_zero(vmablock, VMA_BLOCK_SIZE)) {
1607 + mask |= bit;
1608 + memcpy(vmaw->outbuf + vmaw->outbuf_pos, vmablock,
1609 + VMA_BLOCK_SIZE);
1610 + vmaw->outbuf_pos += VMA_BLOCK_SIZE;
1611 + } else {
1612 + DPRINTF("VMA WRITE %zd ZERO BLOCK %d\n", cluster_num, i);
1613 + vmaw->stream_info[dev_id].zero_bytes += VMA_BLOCK_SIZE;
1614 + *zero_bytes += VMA_BLOCK_SIZE;
1615 + }
1616 +
1617 + bit = bit << 1;
1618 + }
1619 + } else {
1620 + DPRINTF("VMA WRITE %zd ZERO CLUSTER\n", cluster_num);
1621 + vmaw->stream_info[dev_id].zero_bytes += VMA_CLUSTER_SIZE;
1622 + *zero_bytes += VMA_CLUSTER_SIZE;
1623 + }
1624 +
1625 + uint64_t block_info = ((uint64_t)mask) << (32+16);
1626 + block_info |= ((uint64_t)dev_id) << 32;
1627 + block_info |= (cluster_num & 0xffffffff);
1628 + vmaw->outbuf_block_info[vmaw->outbuf_count] = block_info;
1629 +
1630 + DPRINTF("VMA WRITE MASK %zd %zx\n", cluster_num, block_info);
1631 +
1632 + vmaw->outbuf_count++;
1633 +
1634 + /** NOTE: We allways write whole clusters, but we correctly set
1635 + * transferred bytes. So transferred == size when when everything
1636 + * went OK.
1637 + */
1638 + size_t transferred = VMA_CLUSTER_SIZE;
1639 +
1640 + if (dev_id != vmaw->vmstate_stream) {
1641 + uint64_t last = (cluster_num + 1) * VMA_CLUSTER_SIZE;
1642 + if (last > vmaw->stream_info[dev_id].size) {
1643 + uint64_t diff = last - vmaw->stream_info[dev_id].size;
1644 + if (diff >= VMA_CLUSTER_SIZE) {
1645 + vma_writer_set_error(vmaw, "vma_writer_write: "
1646 + "read after last cluster");
1647 + return -1;
1648 + }
1649 + transferred -= diff;
1650 + }
1651 + }
1652 +
1653 + vmaw->stream_info[dev_id].transferred += transferred;
1654 +
1655 + return transferred;
1656 +}
1657 +
1658 +int vma_writer_close(VmaWriter *vmaw, Error **errp)
1659 +{
1660 + g_assert(vmaw != NULL);
1661 +
1662 + int i;
1663 +
1664 + vma_queue_flush(vmaw);
1665 +
1666 + /* this should not happen - just to be sure */
1667 + while (!qemu_co_queue_empty(&vmaw->wqueue)) {
1668 + DPRINTF("vma_writer_close wait\n");
1669 + co_aio_sleep_ns(qemu_get_aio_context(), QEMU_CLOCK_REALTIME, 1000000);
1670 + }
1671 +
1672 + if (vmaw->cmd) {
1673 + if (pclose(vmaw->cmd) < 0) {
1674 + vma_writer_set_error(vmaw, "vma_writer_close: "
1675 + "pclose failed - %s", g_strerror(errno));
1676 + }
1677 + } else {
1678 + if (close(vmaw->fd) < 0) {
1679 + vma_writer_set_error(vmaw, "vma_writer_close: "
1680 + "close failed - %s", g_strerror(errno));
1681 + }
1682 + }
1683 +
1684 + for (i = 0; i <= 255; i++) {
1685 + VmaStreamInfo *si = &vmaw->stream_info[i];
1686 + if (si->size) {
1687 + if (!si->finished) {
1688 + vma_writer_set_error(vmaw, "vma_writer_close: "
1689 + "detected open stream '%s'", si->devname);
1690 + } else if ((si->transferred != si->size) &&
1691 + (i != vmaw->vmstate_stream)) {
1692 + vma_writer_set_error(vmaw, "vma_writer_close: "
1693 + "incomplete stream '%s' (%zd != %zd)",
1694 + si->devname, si->transferred, si->size);
1695 + }
1696 + }
1697 + }
1698 +
1699 + for (i = 0; i <= 255; i++) {
1700 + vmaw->stream_info[i].finished = 1; /* mark as closed */
1701 + }
1702 +
1703 + vmaw->closed = 1;
1704 +
1705 + if (vmaw->status < 0 && *errp == NULL) {
1706 + error_setg(errp, "%s", vmaw->errmsg);
1707 + }
1708 +
1709 + return vmaw->status;
1710 +}
1711 +
1712 +void vma_writer_destroy(VmaWriter *vmaw)
1713 +{
1714 + assert(vmaw);
1715 +
1716 + int i;
1717 +
1718 + for (i = 0; i <= 255; i++) {
1719 + if (vmaw->stream_info[i].devname) {
1720 + g_free(vmaw->stream_info[i].devname);
1721 + }
1722 + }
1723 +
1724 + if (vmaw->md5csum) {
1725 + g_checksum_free(vmaw->md5csum);
1726 + }
1727 +
1728 + for (i = 0; i < WRITE_BUFFERS; i++) {
1729 + free(vmaw->aiocbs[i]);
1730 + }
1731 +
1732 + g_free(vmaw);
1733 +}
1734 diff --git a/vma.c b/vma.c
1735 new file mode 100644
1736 index 0000000..8014090
1737 --- /dev/null
1738 +++ b/vma.c
1739 @@ -0,0 +1,585 @@
1740 +/*
1741 + * VMA: Virtual Machine Archive
1742 + *
1743 + * Copyright (C) 2012-2013 Proxmox Server Solutions
1744 + *
1745 + * Authors:
1746 + * Dietmar Maurer (dietmar@proxmox.com)
1747 + *
1748 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
1749 + * See the COPYING file in the top-level directory.
1750 + *
1751 + */
1752 +
1753 +#include "qemu/osdep.h"
1754 +#include <glib.h>
1755 +
1756 +#include "vma.h"
1757 +#include "qemu-common.h"
1758 +#include "qemu/error-report.h"
1759 +#include "qemu/main-loop.h"
1760 +#include "sysemu/char.h" /* qstring_from_str */
1761 +
1762 +static void help(void)
1763 +{
1764 + const char *help_msg =
1765 + "usage: vma command [command options]\n"
1766 + "\n"
1767 + "vma list <filename>\n"
1768 + "vma create <filename> [-c config] <archive> pathname ...\n"
1769 + "vma extract <filename> [-r <fifo>] <targetdir>\n"
1770 + ;
1771 +
1772 + printf("%s", help_msg);
1773 + exit(1);
1774 +}
1775 +
1776 +static const char *extract_devname(const char *path, char **devname, int index)
1777 +{
1778 + assert(path);
1779 +
1780 + const char *sep = strchr(path, '=');
1781 +
1782 + if (sep) {
1783 + *devname = g_strndup(path, sep - path);
1784 + path = sep + 1;
1785 + } else {
1786 + if (index >= 0) {
1787 + *devname = g_strdup_printf("disk%d", index);
1788 + } else {
1789 + *devname = NULL;
1790 + }
1791 + }
1792 +
1793 + return path;
1794 +}
1795 +
1796 +static void print_content(VmaReader *vmar)
1797 +{
1798 + assert(vmar);
1799 +
1800 + VmaHeader *head = vma_reader_get_header(vmar);
1801 +
1802 + GList *l = vma_reader_get_config_data(vmar);
1803 + while (l && l->data) {
1804 + VmaConfigData *cdata = (VmaConfigData *)l->data;
1805 + l = g_list_next(l);
1806 + printf("CFG: size: %d name: %s\n", cdata->len, cdata->name);
1807 + }
1808 +
1809 + int i;
1810 + VmaDeviceInfo *di;
1811 + for (i = 1; i < 255; i++) {
1812 + di = vma_reader_get_device_info(vmar, i);
1813 + if (di) {
1814 + if (strcmp(di->devname, "vmstate") == 0) {
1815 + printf("VMSTATE: dev_id=%d memory: %zd\n", i, di->size);
1816 + } else {
1817 + printf("DEV: dev_id=%d size: %zd devname: %s\n",
1818 + i, di->size, di->devname);
1819 + }
1820 + }
1821 + }
1822 + /* ctime is the last entry we print */
1823 + printf("CTIME: %s", ctime(&head->ctime));
1824 + fflush(stdout);
1825 +}
1826 +
1827 +static int list_content(int argc, char **argv)
1828 +{
1829 + int c, ret = 0;
1830 + const char *filename;
1831 +
1832 + for (;;) {
1833 + c = getopt(argc, argv, "h");
1834 + if (c == -1) {
1835 + break;
1836 + }
1837 + switch (c) {
1838 + case '?':
1839 + case 'h':
1840 + help();
1841 + break;
1842 + default:
1843 + g_assert_not_reached();
1844 + }
1845 + }
1846 +
1847 + /* Get the filename */
1848 + if ((optind + 1) != argc) {
1849 + help();
1850 + }
1851 + filename = argv[optind++];
1852 +
1853 + Error *errp = NULL;
1854 + VmaReader *vmar = vma_reader_create(filename, &errp);
1855 +
1856 + if (!vmar) {
1857 + g_error("%s", error_get_pretty(errp));
1858 + }
1859 +
1860 + print_content(vmar);
1861 +
1862 + vma_reader_destroy(vmar);
1863 +
1864 + return ret;
1865 +}
1866 +
1867 +typedef struct RestoreMap {
1868 + char *devname;
1869 + char *path;
1870 + bool write_zero;
1871 +} RestoreMap;
1872 +
1873 +static int extract_content(int argc, char **argv)
1874 +{
1875 + int c, ret = 0;
1876 + int verbose = 0;
1877 + const char *filename;
1878 + const char *dirname;
1879 + const char *readmap = NULL;
1880 +
1881 + for (;;) {
1882 + c = getopt(argc, argv, "hvr:");
1883 + if (c == -1) {
1884 + break;
1885 + }
1886 + switch (c) {
1887 + case '?':
1888 + case 'h':
1889 + help();
1890 + break;
1891 + case 'r':
1892 + readmap = optarg;
1893 + break;
1894 + case 'v':
1895 + verbose = 1;
1896 + break;
1897 + default:
1898 + help();
1899 + }
1900 + }
1901 +
1902 + /* Get the filename */
1903 + if ((optind + 2) != argc) {
1904 + help();
1905 + }
1906 + filename = argv[optind++];
1907 + dirname = argv[optind++];
1908 +
1909 + Error *errp = NULL;
1910 + VmaReader *vmar = vma_reader_create(filename, &errp);
1911 +
1912 + if (!vmar) {
1913 + g_error("%s", error_get_pretty(errp));
1914 + }
1915 +
1916 + if (mkdir(dirname, 0777) < 0) {
1917 + g_error("unable to create target directory %s - %s",
1918 + dirname, g_strerror(errno));
1919 + }
1920 +
1921 + GList *l = vma_reader_get_config_data(vmar);
1922 + while (l && l->data) {
1923 + VmaConfigData *cdata = (VmaConfigData *)l->data;
1924 + l = g_list_next(l);
1925 + char *cfgfn = g_strdup_printf("%s/%s", dirname, cdata->name);
1926 + GError *err = NULL;
1927 + if (!g_file_set_contents(cfgfn, (gchar *)cdata->data, cdata->len,
1928 + &err)) {
1929 + g_error("unable to write file: %s", err->message);
1930 + }
1931 + }
1932 +
1933 + GHashTable *devmap = g_hash_table_new(g_str_hash, g_str_equal);
1934 +
1935 + if (readmap) {
1936 + print_content(vmar);
1937 +
1938 + FILE *map = fopen(readmap, "r");
1939 + if (!map) {
1940 + g_error("unable to open fifo %s - %s", readmap, g_strerror(errno));
1941 + }
1942 +
1943 + while (1) {
1944 + char inbuf[8192];
1945 + char *line = fgets(inbuf, sizeof(inbuf), map);
1946 + if (!line || line[0] == '\0' || !strcmp(line, "done\n")) {
1947 + break;
1948 + }
1949 + int len = strlen(line);
1950 + if (line[len - 1] == '\n') {
1951 + line[len - 1] = '\0';
1952 + if (len == 1) {
1953 + break;
1954 + }
1955 + }
1956 +
1957 + const char *path;
1958 + bool write_zero;
1959 + if (line[0] == '0' && line[1] == ':') {
1960 + path = inbuf + 2;
1961 + write_zero = false;
1962 + } else if (line[0] == '1' && line[1] == ':') {
1963 + path = inbuf + 2;
1964 + write_zero = true;
1965 + } else {
1966 + g_error("read map failed - parse error ('%s')", inbuf);
1967 + }
1968 +
1969 + char *devname = NULL;
1970 + path = extract_devname(path, &devname, -1);
1971 + if (!devname) {
1972 + g_error("read map failed - no dev name specified ('%s')",
1973 + inbuf);
1974 + }
1975 +
1976 + RestoreMap *map = g_new0(RestoreMap, 1);
1977 + map->devname = g_strdup(devname);
1978 + map->path = g_strdup(path);
1979 + map->write_zero = write_zero;
1980 +
1981 + g_hash_table_insert(devmap, map->devname, map);
1982 +
1983 + };
1984 + }
1985 +
1986 + int i;
1987 + int vmstate_fd = -1;
1988 + guint8 vmstate_stream = 0;
1989 +
1990 + for (i = 1; i < 255; i++) {
1991 + VmaDeviceInfo *di = vma_reader_get_device_info(vmar, i);
1992 + if (di && (strcmp(di->devname, "vmstate") == 0)) {
1993 + vmstate_stream = i;
1994 + char *statefn = g_strdup_printf("%s/vmstate.bin", dirname);
1995 + vmstate_fd = open(statefn, O_WRONLY|O_CREAT|O_EXCL, 0644);
1996 + if (vmstate_fd < 0) {
1997 + g_error("create vmstate file '%s' failed - %s", statefn,
1998 + g_strerror(errno));
1999 + }
2000 + g_free(statefn);
2001 + } else if (di) {
2002 + char *devfn = NULL;
2003 + int flags = BDRV_O_RDWR|BDRV_O_CACHE_WB;
2004 + bool write_zero = true;
2005 +
2006 + if (readmap) {
2007 + RestoreMap *map;
2008 + map = (RestoreMap *)g_hash_table_lookup(devmap, di->devname);
2009 + if (map == NULL) {
2010 + g_error("no device name mapping for %s", di->devname);
2011 + }
2012 + devfn = map->path;
2013 + write_zero = map->write_zero;
2014 + } else {
2015 + devfn = g_strdup_printf("%s/tmp-disk-%s.raw",
2016 + dirname, di->devname);
2017 + printf("DEVINFO %s %zd\n", devfn, di->size);
2018 +
2019 + bdrv_img_create(devfn, "raw", NULL, NULL, NULL, di->size,
2020 + flags, &errp, 0);
2021 + if (errp) {
2022 + g_error("can't create file %s: %s", devfn,
2023 + error_get_pretty(errp));
2024 + }
2025 +
2026 + /* Note: we created an empty file above, so there is no
2027 + * need to write zeroes (so we generate a sparse file)
2028 + */
2029 + write_zero = false;
2030 + }
2031 +
2032 + BlockDriverState *bs = bdrv_new();
2033 + if (errp || bdrv_open(&bs, devfn, NULL, NULL, flags, &errp)) {
2034 + g_error("can't open file %s - %s", devfn,
2035 + error_get_pretty(errp));
2036 + }
2037 + if (vma_reader_register_bs(vmar, i, bs, write_zero, &errp) < 0) {
2038 + g_error("%s", error_get_pretty(errp));
2039 + }
2040 +
2041 + if (!readmap) {
2042 + g_free(devfn);
2043 + }
2044 + }
2045 + }
2046 +
2047 + if (vma_reader_restore(vmar, vmstate_fd, verbose, &errp) < 0) {
2048 + g_error("restore failed - %s", error_get_pretty(errp));
2049 + }
2050 +
2051 + if (!readmap) {
2052 + for (i = 1; i < 255; i++) {
2053 + VmaDeviceInfo *di = vma_reader_get_device_info(vmar, i);
2054 + if (di && (i != vmstate_stream)) {
2055 + char *tmpfn = g_strdup_printf("%s/tmp-disk-%s.raw",
2056 + dirname, di->devname);
2057 + char *fn = g_strdup_printf("%s/disk-%s.raw",
2058 + dirname, di->devname);
2059 + if (rename(tmpfn, fn) != 0) {
2060 + g_error("rename %s to %s failed - %s",
2061 + tmpfn, fn, g_strerror(errno));
2062 + }
2063 + }
2064 + }
2065 + }
2066 +
2067 + vma_reader_destroy(vmar);
2068 +
2069 + bdrv_close_all();
2070 +
2071 + return ret;
2072 +}
2073 +
2074 +typedef struct BackupJob {
2075 + BlockDriverState *bs;
2076 + int64_t len;
2077 + VmaWriter *vmaw;
2078 + uint8_t dev_id;
2079 +} BackupJob;
2080 +
2081 +#define BACKUP_SECTORS_PER_CLUSTER (VMA_CLUSTER_SIZE / BDRV_SECTOR_SIZE)
2082 +
2083 +static void coroutine_fn backup_run(void *opaque)
2084 +{
2085 + BackupJob *job = (BackupJob *)opaque;
2086 + struct iovec iov;
2087 + QEMUIOVector qiov;
2088 +
2089 + int64_t start, end;
2090 + int ret = 0;
2091 +
2092 + unsigned char *buf = qemu_blockalign(job->bs, VMA_CLUSTER_SIZE);
2093 +
2094 + start = 0;
2095 + end = DIV_ROUND_UP(job->len / BDRV_SECTOR_SIZE,
2096 + BACKUP_SECTORS_PER_CLUSTER);
2097 +
2098 + for (; start < end; start++) {
2099 + iov.iov_base = buf;
2100 + iov.iov_len = VMA_CLUSTER_SIZE;
2101 + qemu_iovec_init_external(&qiov, &iov, 1);
2102 +
2103 + ret = bdrv_co_readv(job->bs, start * BACKUP_SECTORS_PER_CLUSTER,
2104 + BACKUP_SECTORS_PER_CLUSTER, &qiov);
2105 + if (ret < 0) {
2106 + vma_writer_set_error(job->vmaw, "read error", -1);
2107 + goto out;
2108 + }
2109 +
2110 + size_t zb = 0;
2111 + if (vma_writer_write(job->vmaw, job->dev_id, start, buf, &zb) < 0) {
2112 + vma_writer_set_error(job->vmaw, "backup_dump_cb vma_writer_write failed", -1);
2113 + goto out;
2114 + }
2115 + }
2116 +
2117 +
2118 +out:
2119 + if (vma_writer_close_stream(job->vmaw, job->dev_id) <= 0) {
2120 + Error *err = NULL;
2121 + if (vma_writer_close(job->vmaw, &err) != 0) {
2122 + g_warning("vma_writer_close failed %s", error_get_pretty(err));
2123 + }
2124 + }
2125 +}
2126 +
2127 +static int create_archive(int argc, char **argv)
2128 +{
2129 + int i, c;
2130 + int verbose = 0;
2131 + const char *archivename;
2132 + GList *config_files = NULL;
2133 +
2134 + for (;;) {
2135 + c = getopt(argc, argv, "hvc:");
2136 + if (c == -1) {
2137 + break;
2138 + }
2139 + switch (c) {
2140 + case '?':
2141 + case 'h':
2142 + help();
2143 + break;
2144 + case 'c':
2145 + config_files = g_list_append(config_files, optarg);
2146 + break;
2147 + case 'v':
2148 + verbose = 1;
2149 + break;
2150 + default:
2151 + g_assert_not_reached();
2152 + }
2153 + }
2154 +
2155 +
2156 + /* make sure we have archive name and at least one path */
2157 + if ((optind + 2) > argc) {
2158 + help();
2159 + }
2160 +
2161 + archivename = argv[optind++];
2162 +
2163 + uuid_t uuid;
2164 + uuid_generate(uuid);
2165 +
2166 + Error *local_err = NULL;
2167 + VmaWriter *vmaw = vma_writer_create(archivename, uuid, &local_err);
2168 +
2169 + if (vmaw == NULL) {
2170 + g_error("%s", error_get_pretty(local_err));
2171 + }
2172 +
2173 + GList *l = config_files;
2174 + while (l && l->data) {
2175 + char *name = l->data;
2176 + char *cdata = NULL;
2177 + gsize clen = 0;
2178 + GError *err = NULL;
2179 + if (!g_file_get_contents(name, &cdata, &clen, &err)) {
2180 + unlink(archivename);
2181 + g_error("Unable to read file: %s", err->message);
2182 + }
2183 +
2184 + if (vma_writer_add_config(vmaw, name, cdata, clen) != 0) {
2185 + unlink(archivename);
2186 + g_error("Unable to append config data %s (len = %zd)",
2187 + name, clen);
2188 + }
2189 + l = g_list_next(l);
2190 + }
2191 +
2192 + int ind = 0;
2193 + while (optind < argc) {
2194 + const char *path = argv[optind++];
2195 + char *devname = NULL;
2196 + path = extract_devname(path, &devname, ind++);
2197 +
2198 + Error *errp = NULL;
2199 + BlockDriverState *bs;
2200 +
2201 + bs = bdrv_open(path, NULL, NULL, 0, &errp);
2202 + if (!bs) {
2203 + unlink(archivename);
2204 + g_error("bdrv_open '%s' failed - %s", path, error_get_pretty(errp));
2205 + }
2206 + int64_t size = bdrv_getlength(bs);
2207 + int dev_id = vma_writer_register_stream(vmaw, devname, size);
2208 + if (dev_id <= 0) {
2209 + unlink(archivename);
2210 + g_error("vma_writer_register_stream '%s' failed", devname);
2211 + }
2212 +
2213 + BackupJob *job = g_new0(BackupJob, 1);
2214 + job->len = size;
2215 + job->bs = bs;
2216 + job->vmaw = vmaw;
2217 + job->dev_id = dev_id;
2218 +
2219 + Coroutine *co = qemu_coroutine_create(backup_run, job);
2220 + qemu_coroutine_enter(co);
2221 + }
2222 +
2223 + VmaStatus vmastat;
2224 + int percent = 0;
2225 + int last_percent = -1;
2226 +
2227 + while (1) {
2228 + main_loop_wait(false);
2229 + vma_writer_get_status(vmaw, &vmastat);
2230 +
2231 + if (verbose) {
2232 +
2233 + uint64_t total = 0;
2234 + uint64_t transferred = 0;
2235 + uint64_t zero_bytes = 0;
2236 +
2237 + int i;
2238 + for (i = 0; i < 256; i++) {
2239 + if (vmastat.stream_info[i].size) {
2240 + total += vmastat.stream_info[i].size;
2241 + transferred += vmastat.stream_info[i].transferred;
2242 + zero_bytes += vmastat.stream_info[i].zero_bytes;
2243 + }
2244 + }
2245 + percent = (transferred*100)/total;
2246 + if (percent != last_percent) {
2247 + fprintf(stderr, "progress %d%% %zd/%zd %zd\n", percent,
2248 + transferred, total, zero_bytes);
2249 + fflush(stderr);
2250 +
2251 + last_percent = percent;
2252 + }
2253 + }
2254 +
2255 + if (vmastat.closed) {
2256 + break;
2257 + }
2258 + } else {
2259 + Coroutine *co = qemu_coroutine_create(backup_run_empty, vmaw);
2260 + qemu_coroutine_enter(co);
2261 + while (1) {
2262 + main_loop_wait(false);
2263 + vma_writer_get_status(vmaw, &vmastat);
2264 + if (vmastat.closed) {
2265 + break;
2266 + }
2267 + }
2268 + }
2269 +
2270 + bdrv_drain_all();
2271 +
2272 + vma_writer_get_status(vmaw, &vmastat);
2273 +
2274 + if (verbose) {
2275 + for (i = 0; i < 256; i++) {
2276 + VmaStreamInfo *si = &vmastat.stream_info[i];
2277 + if (si->size) {
2278 + fprintf(stderr, "image %s: size=%zd zeros=%zd saved=%zd\n",
2279 + si->devname, si->size, si->zero_bytes,
2280 + si->size - si->zero_bytes);
2281 + }
2282 + }
2283 + }
2284 +
2285 + if (vmastat.status < 0) {
2286 + unlink(archivename);
2287 + g_error("creating vma archive failed");
2288 + }
2289 +
2290 + return 0;
2291 +}
2292 +
2293 +int main(int argc, char **argv)
2294 +{
2295 + const char *cmdname;
2296 + Error *main_loop_err = NULL;
2297 +
2298 + error_set_progname(argv[0]);
2299 +
2300 + if (qemu_init_main_loop(&main_loop_err)) {
2301 + g_error("%s", error_get_pretty(main_loop_err));
2302 + }
2303 +
2304 + bdrv_init();
2305 +
2306 + if (argc < 2) {
2307 + help();
2308 + }
2309 +
2310 + cmdname = argv[1];
2311 + argc--; argv++;
2312 +
2313 +
2314 + if (!strcmp(cmdname, "list")) {
2315 + return list_content(argc, argv);
2316 + } else if (!strcmp(cmdname, "create")) {
2317 + return create_archive(argc, argv);
2318 + } else if (!strcmp(cmdname, "extract")) {
2319 + return extract_content(argc, argv);
2320 + }
2321 +
2322 + help();
2323 + return 0;
2324 +}
2325 diff --git a/vma.h b/vma.h
2326 new file mode 100644
2327 index 0000000..6625eb9
2328 --- /dev/null
2329 +++ b/vma.h
2330 @@ -0,0 +1,146 @@
2331 +/*
2332 + * VMA: Virtual Machine Archive
2333 + *
2334 + * Copyright (C) Proxmox Server Solutions
2335 + *
2336 + * Authors:
2337 + * Dietmar Maurer (dietmar@proxmox.com)
2338 + *
2339 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
2340 + * See the COPYING file in the top-level directory.
2341 + *
2342 + */
2343 +
2344 +#ifndef BACKUP_VMA_H
2345 +#define BACKUP_VMA_H
2346 +
2347 +#include <uuid/uuid.h>
2348 +#include "qapi/error.h"
2349 +#include "block/block.h"
2350 +
2351 +#define VMA_BLOCK_BITS 12
2352 +#define VMA_BLOCK_SIZE (1<<VMA_BLOCK_BITS)
2353 +#define VMA_CLUSTER_BITS (VMA_BLOCK_BITS+4)
2354 +#define VMA_CLUSTER_SIZE (1<<VMA_CLUSTER_BITS)
2355 +
2356 +#if VMA_CLUSTER_SIZE != 65536
2357 +#error unexpected cluster size
2358 +#endif
2359 +
2360 +#define VMA_EXTENT_HEADER_SIZE 512
2361 +#define VMA_BLOCKS_PER_EXTENT 59
2362 +#define VMA_MAX_CONFIGS 256
2363 +
2364 +#define VMA_MAX_EXTENT_SIZE \
2365 + (VMA_EXTENT_HEADER_SIZE+VMA_CLUSTER_SIZE*VMA_BLOCKS_PER_EXTENT)
2366 +#if VMA_MAX_EXTENT_SIZE != 3867136
2367 +#error unexpected VMA_EXTENT_SIZE
2368 +#endif
2369 +
2370 +/* File Format Definitions */
2371 +
2372 +#define VMA_MAGIC (GUINT32_TO_BE(('V'<<24)|('M'<<16)|('A'<<8)|0x00))
2373 +#define VMA_EXTENT_MAGIC (GUINT32_TO_BE(('V'<<24)|('M'<<16)|('A'<<8)|'E'))
2374 +
2375 +typedef struct VmaDeviceInfoHeader {
2376 + uint32_t devname_ptr; /* offset into blob_buffer table */
2377 + uint32_t reserved0;
2378 + uint64_t size; /* device size in bytes */
2379 + uint64_t reserved1;
2380 + uint64_t reserved2;
2381 +} VmaDeviceInfoHeader;
2382 +
2383 +typedef struct VmaHeader {
2384 + uint32_t magic;
2385 + uint32_t version;
2386 + unsigned char uuid[16];
2387 + int64_t ctime;
2388 + unsigned char md5sum[16];
2389 +
2390 + uint32_t blob_buffer_offset;
2391 + uint32_t blob_buffer_size;
2392 + uint32_t header_size;
2393 +
2394 + unsigned char reserved[1984];
2395 +
2396 + uint32_t config_names[VMA_MAX_CONFIGS]; /* offset into blob_buffer table */
2397 + uint32_t config_data[VMA_MAX_CONFIGS]; /* offset into blob_buffer table */
2398 +
2399 + uint32_t reserved1;
2400 +
2401 + VmaDeviceInfoHeader dev_info[256];
2402 +} VmaHeader;
2403 +
2404 +typedef struct VmaExtentHeader {
2405 + uint32_t magic;
2406 + uint16_t reserved1;
2407 + uint16_t block_count;
2408 + unsigned char uuid[16];
2409 + unsigned char md5sum[16];
2410 + uint64_t blockinfo[VMA_BLOCKS_PER_EXTENT];
2411 +} VmaExtentHeader;
2412 +
2413 +/* functions/definitions to read/write vma files */
2414 +
2415 +typedef struct VmaReader VmaReader;
2416 +
2417 +typedef struct VmaWriter VmaWriter;
2418 +
2419 +typedef struct VmaConfigData {
2420 + const char *name;
2421 + const void *data;
2422 + uint32_t len;
2423 +} VmaConfigData;
2424 +
2425 +typedef struct VmaStreamInfo {
2426 + uint64_t size;
2427 + uint64_t cluster_count;
2428 + uint64_t transferred;
2429 + uint64_t zero_bytes;
2430 + int finished;
2431 + char *devname;
2432 +} VmaStreamInfo;
2433 +
2434 +typedef struct VmaStatus {
2435 + int status;
2436 + bool closed;
2437 + char errmsg[8192];
2438 + char uuid_str[37];
2439 + VmaStreamInfo stream_info[256];
2440 +} VmaStatus;
2441 +
2442 +typedef struct VmaDeviceInfo {
2443 + uint64_t size; /* device size in bytes */
2444 + const char *devname;
2445 +} VmaDeviceInfo;
2446 +
2447 +VmaWriter *vma_writer_create(const char *filename, uuid_t uuid, Error **errp);
2448 +int vma_writer_close(VmaWriter *vmaw, Error **errp);
2449 +void vma_writer_destroy(VmaWriter *vmaw);
2450 +int vma_writer_add_config(VmaWriter *vmaw, const char *name, gpointer data,
2451 + size_t len);
2452 +int vma_writer_register_stream(VmaWriter *vmaw, const char *devname,
2453 + size_t size);
2454 +
2455 +int64_t coroutine_fn vma_writer_write(VmaWriter *vmaw, uint8_t dev_id,
2456 + int64_t cluster_num, unsigned char *buf,
2457 + size_t *zero_bytes);
2458 +
2459 +int coroutine_fn vma_writer_close_stream(VmaWriter *vmaw, uint8_t dev_id);
2460 +
2461 +int vma_writer_get_status(VmaWriter *vmaw, VmaStatus *status);
2462 +void vma_writer_set_error(VmaWriter *vmaw, const char *fmt, ...);
2463 +
2464 +
2465 +VmaReader *vma_reader_create(const char *filename, Error **errp);
2466 +void vma_reader_destroy(VmaReader *vmar);
2467 +VmaHeader *vma_reader_get_header(VmaReader *vmar);
2468 +GList *vma_reader_get_config_data(VmaReader *vmar);
2469 +VmaDeviceInfo *vma_reader_get_device_info(VmaReader *vmar, guint8 dev_id);
2470 +int vma_reader_register_bs(VmaReader *vmar, guint8 dev_id,
2471 + BlockDriverState *bs, bool write_zeroes,
2472 + Error **errp);
2473 +int vma_reader_restore(VmaReader *vmar, int vmstate_fd, bool verbose,
2474 + Error **errp);
2475 +
2476 +#endif /* BACKUP_VMA_H */
2477 --
2478 2.1.4