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31#include "qemu/osdep.h"
32#include "qapi/error.h"
33#include "block/block_int.h"
34#include "sysemu/block-backend.h"
35#include "qemu/module.h"
36#include "qemu/option.h"
37#include "qapi/qmp/qdict.h"
38#include "qapi/qobject-input-visitor.h"
39#include "qapi/qapi-visit-block-core.h"
40#include "qemu/bswap.h"
41#include "qemu/bitmap.h"
42#include "migration/blocker.h"
43#include "parallels.h"
44
45
46
47#define HEADER_MAGIC "WithoutFreeSpace"
48#define HEADER_MAGIC2 "WithouFreSpacExt"
49#define HEADER_VERSION 2
50#define HEADER_INUSE_MAGIC (0x746F6E59)
51#define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32)
52
53static QEnumLookup prealloc_mode_lookup = {
54 .array = (const char *const[]) {
55 "falloc",
56 "truncate",
57 },
58 .size = PRL_PREALLOC_MODE__MAX
59};
60
61#define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode"
62#define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size"
63
64static QemuOptsList parallels_runtime_opts = {
65 .name = "parallels",
66 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head),
67 .desc = {
68 {
69 .name = PARALLELS_OPT_PREALLOC_SIZE,
70 .type = QEMU_OPT_SIZE,
71 .help = "Preallocation size on image expansion",
72 .def_value_str = "128M",
73 },
74 {
75 .name = PARALLELS_OPT_PREALLOC_MODE,
76 .type = QEMU_OPT_STRING,
77 .help = "Preallocation mode on image expansion "
78 "(allowed values: falloc, truncate)",
79 .def_value_str = "falloc",
80 },
81 { },
82 },
83};
84
85static QemuOptsList parallels_create_opts = {
86 .name = "parallels-create-opts",
87 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
88 .desc = {
89 {
90 .name = BLOCK_OPT_SIZE,
91 .type = QEMU_OPT_SIZE,
92 .help = "Virtual disk size",
93 },
94 {
95 .name = BLOCK_OPT_CLUSTER_SIZE,
96 .type = QEMU_OPT_SIZE,
97 .help = "Parallels image cluster size",
98 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
99 },
100 { }
101 }
102};
103
104
105static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
106{
107 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier;
108}
109
110static uint32_t bat_entry_off(uint32_t idx)
111{
112 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx;
113}
114
115static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num)
116{
117 uint32_t index, offset;
118
119 index = sector_num / s->tracks;
120 offset = sector_num % s->tracks;
121
122
123 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) {
124 return -1;
125 }
126 return bat2sect(s, index) + offset;
127}
128
129static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
130 int nb_sectors)
131{
132 int ret = s->tracks - sector_num % s->tracks;
133 return MIN(nb_sectors, ret);
134}
135
136static int64_t block_status(BDRVParallelsState *s, int64_t sector_num,
137 int nb_sectors, int *pnum)
138{
139 int64_t start_off = -2, prev_end_off = -2;
140
141 *pnum = 0;
142 while (nb_sectors > 0 || start_off == -2) {
143 int64_t offset = seek_to_sector(s, sector_num);
144 int to_end;
145
146 if (start_off == -2) {
147 start_off = offset;
148 prev_end_off = offset;
149 } else if (offset != prev_end_off) {
150 break;
151 }
152
153 to_end = cluster_remainder(s, sector_num, nb_sectors);
154 nb_sectors -= to_end;
155 sector_num += to_end;
156 *pnum += to_end;
157
158 if (offset > 0) {
159 prev_end_off += to_end;
160 }
161 }
162 return start_off;
163}
164
165static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
166 int nb_sectors, int *pnum)
167{
168 int ret;
169 BDRVParallelsState *s = bs->opaque;
170 int64_t pos, space, idx, to_allocate, i, len;
171
172 pos = block_status(s, sector_num, nb_sectors, pnum);
173 if (pos > 0) {
174 return pos;
175 }
176
177 idx = sector_num / s->tracks;
178 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx;
179
180
181
182
183
184
185
186
187
188
189 assert(idx < s->bat_size && idx + to_allocate <= s->bat_size);
190
191 space = to_allocate * s->tracks;
192 len = bdrv_getlength(bs->file->bs);
193 if (len < 0) {
194 return len;
195 }
196 if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) {
197 space += s->prealloc_size;
198 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
199 ret = bdrv_pwrite_zeroes(bs->file,
200 s->data_end << BDRV_SECTOR_BITS,
201 space << BDRV_SECTOR_BITS, 0);
202 } else {
203 ret = bdrv_truncate(bs->file,
204 (s->data_end + space) << BDRV_SECTOR_BITS,
205 PREALLOC_MODE_OFF, NULL);
206 }
207 if (ret < 0) {
208 return ret;
209 }
210 }
211
212
213
214
215
216
217
218
219 if (bs->backing) {
220 int64_t nb_cow_sectors = to_allocate * s->tracks;
221 int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS;
222 QEMUIOVector qiov;
223 struct iovec iov = {
224 .iov_len = nb_cow_bytes,
225 .iov_base = qemu_blockalign(bs, nb_cow_bytes)
226 };
227 qemu_iovec_init_external(&qiov, &iov, 1);
228
229 ret = bdrv_co_readv(bs->backing, idx * s->tracks, nb_cow_sectors,
230 &qiov);
231 if (ret < 0) {
232 qemu_vfree(iov.iov_base);
233 return ret;
234 }
235
236 ret = bdrv_co_writev(bs->file, s->data_end, nb_cow_sectors, &qiov);
237 qemu_vfree(iov.iov_base);
238 if (ret < 0) {
239 return ret;
240 }
241 }
242
243 for (i = 0; i < to_allocate; i++) {
244 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier);
245 s->data_end += s->tracks;
246 bitmap_set(s->bat_dirty_bmap,
247 bat_entry_off(idx + i) / s->bat_dirty_block, 1);
248 }
249
250 return bat2sect(s, idx) + sector_num % s->tracks;
251}
252
253
254static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
255{
256 BDRVParallelsState *s = bs->opaque;
257 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block);
258 unsigned long bit;
259
260 qemu_co_mutex_lock(&s->lock);
261
262 bit = find_first_bit(s->bat_dirty_bmap, size);
263 while (bit < size) {
264 uint32_t off = bit * s->bat_dirty_block;
265 uint32_t to_write = s->bat_dirty_block;
266 int ret;
267
268 if (off + to_write > s->header_size) {
269 to_write = s->header_size - off;
270 }
271 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off,
272 to_write);
273 if (ret < 0) {
274 qemu_co_mutex_unlock(&s->lock);
275 return ret;
276 }
277 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1);
278 }
279 bitmap_zero(s->bat_dirty_bmap, size);
280
281 qemu_co_mutex_unlock(&s->lock);
282 return 0;
283}
284
285
286static int coroutine_fn parallels_co_block_status(BlockDriverState *bs,
287 bool want_zero,
288 int64_t offset,
289 int64_t bytes,
290 int64_t *pnum,
291 int64_t *map,
292 BlockDriverState **file)
293{
294 BDRVParallelsState *s = bs->opaque;
295 int count;
296
297 assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
298 qemu_co_mutex_lock(&s->lock);
299 offset = block_status(s, offset >> BDRV_SECTOR_BITS,
300 bytes >> BDRV_SECTOR_BITS, &count);
301 qemu_co_mutex_unlock(&s->lock);
302
303 *pnum = count * BDRV_SECTOR_SIZE;
304 if (offset < 0) {
305 return 0;
306 }
307
308 *map = offset * BDRV_SECTOR_SIZE;
309 *file = bs->file->bs;
310 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
311}
312
313static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
314 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
315{
316 BDRVParallelsState *s = bs->opaque;
317 uint64_t bytes_done = 0;
318 QEMUIOVector hd_qiov;
319 int ret = 0;
320
321 qemu_iovec_init(&hd_qiov, qiov->niov);
322
323 while (nb_sectors > 0) {
324 int64_t position;
325 int n, nbytes;
326
327 qemu_co_mutex_lock(&s->lock);
328 position = allocate_clusters(bs, sector_num, nb_sectors, &n);
329 qemu_co_mutex_unlock(&s->lock);
330 if (position < 0) {
331 ret = (int)position;
332 break;
333 }
334
335 nbytes = n << BDRV_SECTOR_BITS;
336
337 qemu_iovec_reset(&hd_qiov);
338 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
339
340 ret = bdrv_co_writev(bs->file, position, n, &hd_qiov);
341 if (ret < 0) {
342 break;
343 }
344
345 nb_sectors -= n;
346 sector_num += n;
347 bytes_done += nbytes;
348 }
349
350 qemu_iovec_destroy(&hd_qiov);
351 return ret;
352}
353
354static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
355 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
356{
357 BDRVParallelsState *s = bs->opaque;
358 uint64_t bytes_done = 0;
359 QEMUIOVector hd_qiov;
360 int ret = 0;
361
362 qemu_iovec_init(&hd_qiov, qiov->niov);
363
364 while (nb_sectors > 0) {
365 int64_t position;
366 int n, nbytes;
367
368 qemu_co_mutex_lock(&s->lock);
369 position = block_status(s, sector_num, nb_sectors, &n);
370 qemu_co_mutex_unlock(&s->lock);
371
372 nbytes = n << BDRV_SECTOR_BITS;
373
374 qemu_iovec_reset(&hd_qiov);
375 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
376
377 if (position < 0) {
378 if (bs->backing) {
379 ret = bdrv_co_readv(bs->backing, sector_num, n, &hd_qiov);
380 if (ret < 0) {
381 break;
382 }
383 } else {
384 qemu_iovec_memset(&hd_qiov, 0, 0, nbytes);
385 }
386 } else {
387 ret = bdrv_co_readv(bs->file, position, n, &hd_qiov);
388 if (ret < 0) {
389 break;
390 }
391 }
392
393 nb_sectors -= n;
394 sector_num += n;
395 bytes_done += nbytes;
396 }
397
398 qemu_iovec_destroy(&hd_qiov);
399 return ret;
400}
401
402
403static int coroutine_fn parallels_co_check(BlockDriverState *bs,
404 BdrvCheckResult *res,
405 BdrvCheckMode fix)
406{
407 BDRVParallelsState *s = bs->opaque;
408 int64_t size, prev_off, high_off;
409 int ret;
410 uint32_t i;
411 bool flush_bat = false;
412 int cluster_size = s->tracks << BDRV_SECTOR_BITS;
413
414 size = bdrv_getlength(bs->file->bs);
415 if (size < 0) {
416 res->check_errors++;
417 return size;
418 }
419
420 qemu_co_mutex_lock(&s->lock);
421 if (s->header_unclean) {
422 fprintf(stderr, "%s image was not closed correctly\n",
423 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
424 res->corruptions++;
425 if (fix & BDRV_FIX_ERRORS) {
426
427 res->corruptions_fixed++;
428 s->header_unclean = false;
429 }
430 }
431
432 res->bfi.total_clusters = s->bat_size;
433 res->bfi.compressed_clusters = 0;
434
435 high_off = 0;
436 prev_off = 0;
437 for (i = 0; i < s->bat_size; i++) {
438 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS;
439 if (off == 0) {
440 prev_off = 0;
441 continue;
442 }
443
444
445 if (off > size) {
446 fprintf(stderr, "%s cluster %u is outside image\n",
447 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
448 res->corruptions++;
449 if (fix & BDRV_FIX_ERRORS) {
450 prev_off = 0;
451 s->bat_bitmap[i] = 0;
452 res->corruptions_fixed++;
453 flush_bat = true;
454 continue;
455 }
456 }
457
458 res->bfi.allocated_clusters++;
459 if (off > high_off) {
460 high_off = off;
461 }
462
463 if (prev_off != 0 && (prev_off + cluster_size) != off) {
464 res->bfi.fragmented_clusters++;
465 }
466 prev_off = off;
467 }
468
469 ret = 0;
470 if (flush_bat) {
471 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size);
472 if (ret < 0) {
473 res->check_errors++;
474 goto out;
475 }
476 }
477
478 res->image_end_offset = high_off + cluster_size;
479 if (size > res->image_end_offset) {
480 int64_t count;
481 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size);
482 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
483 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
484 size - res->image_end_offset);
485 res->leaks += count;
486 if (fix & BDRV_FIX_LEAKS) {
487 Error *local_err = NULL;
488 ret = bdrv_truncate(bs->file, res->image_end_offset,
489 PREALLOC_MODE_OFF, &local_err);
490 if (ret < 0) {
491 error_report_err(local_err);
492 res->check_errors++;
493 goto out;
494 }
495 res->leaks_fixed += count;
496 }
497 }
498
499out:
500 qemu_co_mutex_unlock(&s->lock);
501 return ret;
502}
503
504
505static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts,
506 Error **errp)
507{
508 BlockdevCreateOptionsParallels *parallels_opts;
509 BlockDriverState *bs;
510 BlockBackend *blk;
511 int64_t total_size, cl_size;
512 uint32_t bat_entries, bat_sectors;
513 ParallelsHeader header;
514 uint8_t tmp[BDRV_SECTOR_SIZE];
515 int ret;
516
517 assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS);
518 parallels_opts = &opts->u.parallels;
519
520
521 total_size = parallels_opts->size;
522
523 if (parallels_opts->has_cluster_size) {
524 cl_size = parallels_opts->cluster_size;
525 } else {
526 cl_size = DEFAULT_CLUSTER_SIZE;
527 }
528
529
530 if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) {
531 error_setg(errp, "Cluster size is too large");
532 return -EINVAL;
533 }
534 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) {
535 error_setg(errp, "Image size is too large for this cluster size");
536 return -E2BIG;
537 }
538
539 if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) {
540 error_setg(errp, "Image size must be a multiple of 512 bytes");
541 return -EINVAL;
542 }
543
544 if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) {
545 error_setg(errp, "Cluster size must be a multiple of 512 bytes");
546 return -EINVAL;
547 }
548
549
550 bs = bdrv_open_blockdev_ref(parallels_opts->file, errp);
551 if (bs == NULL) {
552 return -EIO;
553 }
554
555 blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL);
556 ret = blk_insert_bs(blk, bs, errp);
557 if (ret < 0) {
558 goto out;
559 }
560 blk_set_allow_write_beyond_eof(blk, true);
561
562
563 ret = blk_truncate(blk, 0, PREALLOC_MODE_OFF, errp);
564 if (ret < 0) {
565 goto out;
566 }
567
568 bat_entries = DIV_ROUND_UP(total_size, cl_size);
569 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size);
570 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS;
571
572 memset(&header, 0, sizeof(header));
573 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
574 header.version = cpu_to_le32(HEADER_VERSION);
575
576 header.heads = cpu_to_le32(HEADS_NUMBER);
577 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE
578 / HEADS_NUMBER / SEC_IN_CYL);
579 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
580 header.bat_entries = cpu_to_le32(bat_entries);
581 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
582 header.data_off = cpu_to_le32(bat_sectors);
583
584
585 memset(tmp, 0, sizeof(tmp));
586 memcpy(tmp, &header, sizeof(header));
587
588 ret = blk_pwrite(blk, 0, tmp, BDRV_SECTOR_SIZE, 0);
589 if (ret < 0) {
590 goto exit;
591 }
592 ret = blk_pwrite_zeroes(blk, BDRV_SECTOR_SIZE,
593 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0);
594 if (ret < 0) {
595 goto exit;
596 }
597
598 ret = 0;
599out:
600 blk_unref(blk);
601 bdrv_unref(bs);
602 return ret;
603
604exit:
605 error_setg_errno(errp, -ret, "Failed to create Parallels image");
606 goto out;
607}
608
609static int coroutine_fn parallels_co_create_opts(const char *filename,
610 QemuOpts *opts,
611 Error **errp)
612{
613 BlockdevCreateOptions *create_options = NULL;
614 Error *local_err = NULL;
615 BlockDriverState *bs = NULL;
616 QDict *qdict = NULL;
617 QObject *qobj;
618 Visitor *v;
619 int ret;
620
621 static const QDictRenames opt_renames[] = {
622 { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" },
623 { NULL, NULL },
624 };
625
626
627 qdict = qemu_opts_to_qdict_filtered(opts, NULL, ¶llels_create_opts,
628 true);
629
630 if (!qdict_rename_keys(qdict, opt_renames, errp)) {
631 ret = -EINVAL;
632 goto done;
633 }
634
635
636 ret = bdrv_create_file(filename, opts, &local_err);
637 if (ret < 0) {
638 error_propagate(errp, local_err);
639 goto done;
640 }
641
642 bs = bdrv_open(filename, NULL, NULL,
643 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
644 if (bs == NULL) {
645 ret = -EIO;
646 goto done;
647 }
648
649
650 qdict_put_str(qdict, "driver", "parallels");
651 qdict_put_str(qdict, "file", bs->node_name);
652
653 qobj = qdict_crumple(qdict, errp);
654 QDECREF(qdict);
655 qdict = qobject_to(QDict, qobj);
656 if (qdict == NULL) {
657 ret = -EINVAL;
658 goto done;
659 }
660
661 v = qobject_input_visitor_new_keyval(QOBJECT(qdict));
662 visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err);
663 visit_free(v);
664
665 if (local_err) {
666 error_propagate(errp, local_err);
667 ret = -EINVAL;
668 goto done;
669 }
670
671
672 create_options->u.parallels.size =
673 ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE);
674 create_options->u.parallels.cluster_size =
675 ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE);
676
677
678 ret = parallels_co_create(create_options, errp);
679 if (ret < 0) {
680 goto done;
681 }
682 ret = 0;
683
684done:
685 QDECREF(qdict);
686 bdrv_unref(bs);
687 qapi_free_BlockdevCreateOptions(create_options);
688 return ret;
689}
690
691
692static int parallels_probe(const uint8_t *buf, int buf_size,
693 const char *filename)
694{
695 const ParallelsHeader *ph = (const void *)buf;
696
697 if (buf_size < sizeof(ParallelsHeader)) {
698 return 0;
699 }
700
701 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) ||
702 !memcmp(ph->magic, HEADER_MAGIC2, 16)) &&
703 (le32_to_cpu(ph->version) == HEADER_VERSION)) {
704 return 100;
705 }
706
707 return 0;
708}
709
710static int parallels_update_header(BlockDriverState *bs)
711{
712 BDRVParallelsState *s = bs->opaque;
713 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs),
714 sizeof(ParallelsHeader));
715
716 if (size > s->header_size) {
717 size = s->header_size;
718 }
719 return bdrv_pwrite_sync(bs->file, 0, s->header, size);
720}
721
722static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
723 Error **errp)
724{
725 BDRVParallelsState *s = bs->opaque;
726 ParallelsHeader ph;
727 int ret, size, i;
728 QemuOpts *opts = NULL;
729 Error *local_err = NULL;
730 char *buf;
731
732 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
733 false, errp);
734 if (!bs->file) {
735 return -EINVAL;
736 }
737
738 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
739 if (ret < 0) {
740 goto fail;
741 }
742
743 bs->total_sectors = le64_to_cpu(ph.nb_sectors);
744
745 if (le32_to_cpu(ph.version) != HEADER_VERSION) {
746 goto fail_format;
747 }
748 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) {
749 s->off_multiplier = 1;
750 bs->total_sectors = 0xffffffff & bs->total_sectors;
751 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) {
752 s->off_multiplier = le32_to_cpu(ph.tracks);
753 } else {
754 goto fail_format;
755 }
756
757 s->tracks = le32_to_cpu(ph.tracks);
758 if (s->tracks == 0) {
759 error_setg(errp, "Invalid image: Zero sectors per track");
760 ret = -EINVAL;
761 goto fail;
762 }
763 if (s->tracks > INT32_MAX/513) {
764 error_setg(errp, "Invalid image: Too big cluster");
765 ret = -EFBIG;
766 goto fail;
767 }
768
769 s->bat_size = le32_to_cpu(ph.bat_entries);
770 if (s->bat_size > INT_MAX / sizeof(uint32_t)) {
771 error_setg(errp, "Catalog too large");
772 ret = -EFBIG;
773 goto fail;
774 }
775
776 size = bat_entry_off(s->bat_size);
777 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs));
778 s->header = qemu_try_blockalign(bs->file->bs, s->header_size);
779 if (s->header == NULL) {
780 ret = -ENOMEM;
781 goto fail;
782 }
783 s->data_end = le32_to_cpu(ph.data_off);
784 if (s->data_end == 0) {
785 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE);
786 }
787 if (s->data_end < s->header_size) {
788
789
790 s->header_size = size;
791 }
792
793 ret = bdrv_pread(bs->file, 0, s->header, s->header_size);
794 if (ret < 0) {
795 goto fail;
796 }
797 s->bat_bitmap = (uint32_t *)(s->header + 1);
798
799 for (i = 0; i < s->bat_size; i++) {
800 int64_t off = bat2sect(s, i);
801 if (off >= s->data_end) {
802 s->data_end = off + s->tracks;
803 }
804 }
805
806 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
807
808 s->header_unclean = true;
809 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) {
810 error_setg(errp, "parallels: Image was not closed correctly; "
811 "cannot be opened read/write");
812 ret = -EACCES;
813 goto fail;
814 }
815 }
816
817 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err);
818 if (local_err != NULL) {
819 goto fail_options;
820 }
821
822 qemu_opts_absorb_qdict(opts, options, &local_err);
823 if (local_err != NULL) {
824 goto fail_options;
825 }
826
827 s->prealloc_size =
828 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0);
829 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS);
830 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE);
831 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf,
832 PRL_PREALLOC_MODE_FALLOCATE,
833 &local_err);
834 g_free(buf);
835 if (local_err != NULL) {
836 goto fail_options;
837 }
838
839 if (!bdrv_has_zero_init(bs->file->bs)) {
840 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
841 }
842
843 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) {
844 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
845 ret = parallels_update_header(bs);
846 if (ret < 0) {
847 goto fail;
848 }
849 }
850
851 s->bat_dirty_block = 4 * getpagesize();
852 s->bat_dirty_bmap =
853 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block));
854
855
856 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' "
857 "does not support live migration",
858 bdrv_get_device_or_node_name(bs));
859 ret = migrate_add_blocker(s->migration_blocker, &local_err);
860 if (local_err) {
861 error_propagate(errp, local_err);
862 error_free(s->migration_blocker);
863 goto fail;
864 }
865 qemu_co_mutex_init(&s->lock);
866 return 0;
867
868fail_format:
869 error_setg(errp, "Image not in Parallels format");
870 ret = -EINVAL;
871fail:
872 qemu_vfree(s->header);
873 return ret;
874
875fail_options:
876 error_propagate(errp, local_err);
877 ret = -EINVAL;
878 goto fail;
879}
880
881
882static void parallels_close(BlockDriverState *bs)
883{
884 BDRVParallelsState *s = bs->opaque;
885
886 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) {
887 s->header->inuse = 0;
888 parallels_update_header(bs);
889 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS,
890 PREALLOC_MODE_OFF, NULL);
891 }
892
893 g_free(s->bat_dirty_bmap);
894 qemu_vfree(s->header);
895
896 migrate_del_blocker(s->migration_blocker);
897 error_free(s->migration_blocker);
898}
899
900static BlockDriver bdrv_parallels = {
901 .format_name = "parallels",
902 .instance_size = sizeof(BDRVParallelsState),
903 .bdrv_probe = parallels_probe,
904 .bdrv_open = parallels_open,
905 .bdrv_close = parallels_close,
906 .bdrv_child_perm = bdrv_format_default_perms,
907 .bdrv_co_block_status = parallels_co_block_status,
908 .bdrv_has_zero_init = bdrv_has_zero_init_1,
909 .bdrv_co_flush_to_os = parallels_co_flush_to_os,
910 .bdrv_co_readv = parallels_co_readv,
911 .bdrv_co_writev = parallels_co_writev,
912 .supports_backing = true,
913 .bdrv_co_create = parallels_co_create,
914 .bdrv_co_create_opts = parallels_co_create_opts,
915 .bdrv_co_check = parallels_co_check,
916 .create_opts = ¶llels_create_opts,
917};
918
919static void bdrv_parallels_init(void)
920{
921 bdrv_register(&bdrv_parallels);
922}
923
924block_init(bdrv_parallels_init);
925