Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2017-03-16' into staging
[qemu.git] / block / parallels.c
1 /*
2 * Block driver for Parallels disk image format
3 *
4 * Copyright (c) 2007 Alex Beregszaszi
5 * Copyright (c) 2015 Denis V. Lunev <den@openvz.org>
6 *
7 * This code was originally based on comparing different disk images created
8 * by Parallels. Currently it is based on opened OpenVZ sources
9 * available at
10 * http://git.openvz.org/?p=ploop;a=summary
11 *
12 * Permission is hereby granted, free of charge, to any person obtaining a copy
13 * of this software and associated documentation files (the "Software"), to deal
14 * in the Software without restriction, including without limitation the rights
15 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
16 * copies of the Software, and to permit persons to whom the Software is
17 * furnished to do so, subject to the following conditions:
18 *
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
21 *
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
27 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
28 * THE SOFTWARE.
29 */
30 #include "qemu/osdep.h"
31 #include "qapi/error.h"
32 #include "qemu-common.h"
33 #include "block/block_int.h"
34 #include "sysemu/block-backend.h"
35 #include "qemu/module.h"
36 #include "qemu/bswap.h"
37 #include "qemu/bitmap.h"
38 #include "qapi/util.h"
39
40 /**************************************************************/
41
42 #define HEADER_MAGIC "WithoutFreeSpace"
43 #define HEADER_MAGIC2 "WithouFreSpacExt"
44 #define HEADER_VERSION 2
45 #define HEADER_INUSE_MAGIC (0x746F6E59)
46 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32)
47
48 #define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */
49
50
51 // always little-endian
52 typedef struct ParallelsHeader {
53 char magic[16]; // "WithoutFreeSpace"
54 uint32_t version;
55 uint32_t heads;
56 uint32_t cylinders;
57 uint32_t tracks;
58 uint32_t bat_entries;
59 uint64_t nb_sectors;
60 uint32_t inuse;
61 uint32_t data_off;
62 char padding[12];
63 } QEMU_PACKED ParallelsHeader;
64
65
66 typedef enum ParallelsPreallocMode {
67 PRL_PREALLOC_MODE_FALLOCATE = 0,
68 PRL_PREALLOC_MODE_TRUNCATE = 1,
69 PRL_PREALLOC_MODE__MAX = 2,
70 } ParallelsPreallocMode;
71
72 static const char *prealloc_mode_lookup[] = {
73 "falloc",
74 "truncate",
75 NULL,
76 };
77
78
79 typedef struct BDRVParallelsState {
80 /** Locking is conservative, the lock protects
81 * - image file extending (truncate, fallocate)
82 * - any access to block allocation table
83 */
84 CoMutex lock;
85
86 ParallelsHeader *header;
87 uint32_t header_size;
88 bool header_unclean;
89
90 unsigned long *bat_dirty_bmap;
91 unsigned int bat_dirty_block;
92
93 uint32_t *bat_bitmap;
94 unsigned int bat_size;
95
96 int64_t data_end;
97 uint64_t prealloc_size;
98 ParallelsPreallocMode prealloc_mode;
99
100 unsigned int tracks;
101
102 unsigned int off_multiplier;
103 } BDRVParallelsState;
104
105
106 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode"
107 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size"
108
109 static QemuOptsList parallels_runtime_opts = {
110 .name = "parallels",
111 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head),
112 .desc = {
113 {
114 .name = PARALLELS_OPT_PREALLOC_SIZE,
115 .type = QEMU_OPT_SIZE,
116 .help = "Preallocation size on image expansion",
117 .def_value_str = "128MiB",
118 },
119 {
120 .name = PARALLELS_OPT_PREALLOC_MODE,
121 .type = QEMU_OPT_STRING,
122 .help = "Preallocation mode on image expansion "
123 "(allowed values: falloc, truncate)",
124 .def_value_str = "falloc",
125 },
126 { /* end of list */ },
127 },
128 };
129
130
131 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
132 {
133 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier;
134 }
135
136 static uint32_t bat_entry_off(uint32_t idx)
137 {
138 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx;
139 }
140
141 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num)
142 {
143 uint32_t index, offset;
144
145 index = sector_num / s->tracks;
146 offset = sector_num % s->tracks;
147
148 /* not allocated */
149 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) {
150 return -1;
151 }
152 return bat2sect(s, index) + offset;
153 }
154
155 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
156 int nb_sectors)
157 {
158 int ret = s->tracks - sector_num % s->tracks;
159 return MIN(nb_sectors, ret);
160 }
161
162 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num,
163 int nb_sectors, int *pnum)
164 {
165 int64_t start_off = -2, prev_end_off = -2;
166
167 *pnum = 0;
168 while (nb_sectors > 0 || start_off == -2) {
169 int64_t offset = seek_to_sector(s, sector_num);
170 int to_end;
171
172 if (start_off == -2) {
173 start_off = offset;
174 prev_end_off = offset;
175 } else if (offset != prev_end_off) {
176 break;
177 }
178
179 to_end = cluster_remainder(s, sector_num, nb_sectors);
180 nb_sectors -= to_end;
181 sector_num += to_end;
182 *pnum += to_end;
183
184 if (offset > 0) {
185 prev_end_off += to_end;
186 }
187 }
188 return start_off;
189 }
190
191 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
192 int nb_sectors, int *pnum)
193 {
194 BDRVParallelsState *s = bs->opaque;
195 uint32_t idx, to_allocate, i;
196 int64_t pos, space;
197
198 pos = block_status(s, sector_num, nb_sectors, pnum);
199 if (pos > 0) {
200 return pos;
201 }
202
203 idx = sector_num / s->tracks;
204 if (idx >= s->bat_size) {
205 return -EINVAL;
206 }
207
208 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx;
209 space = to_allocate * s->tracks;
210 if (s->data_end + space > bdrv_getlength(bs->file->bs) >> BDRV_SECTOR_BITS) {
211 int ret;
212 space += s->prealloc_size;
213 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
214 ret = bdrv_pwrite_zeroes(bs->file,
215 s->data_end << BDRV_SECTOR_BITS,
216 space << BDRV_SECTOR_BITS, 0);
217 } else {
218 ret = bdrv_truncate(bs->file,
219 (s->data_end + space) << BDRV_SECTOR_BITS);
220 }
221 if (ret < 0) {
222 return ret;
223 }
224 }
225
226 for (i = 0; i < to_allocate; i++) {
227 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier);
228 s->data_end += s->tracks;
229 bitmap_set(s->bat_dirty_bmap,
230 bat_entry_off(idx + i) / s->bat_dirty_block, 1);
231 }
232
233 return bat2sect(s, idx) + sector_num % s->tracks;
234 }
235
236
237 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
238 {
239 BDRVParallelsState *s = bs->opaque;
240 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block);
241 unsigned long bit;
242
243 qemu_co_mutex_lock(&s->lock);
244
245 bit = find_first_bit(s->bat_dirty_bmap, size);
246 while (bit < size) {
247 uint32_t off = bit * s->bat_dirty_block;
248 uint32_t to_write = s->bat_dirty_block;
249 int ret;
250
251 if (off + to_write > s->header_size) {
252 to_write = s->header_size - off;
253 }
254 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off,
255 to_write);
256 if (ret < 0) {
257 qemu_co_mutex_unlock(&s->lock);
258 return ret;
259 }
260 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1);
261 }
262 bitmap_zero(s->bat_dirty_bmap, size);
263
264 qemu_co_mutex_unlock(&s->lock);
265 return 0;
266 }
267
268
269 static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
270 int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
271 {
272 BDRVParallelsState *s = bs->opaque;
273 int64_t offset;
274
275 qemu_co_mutex_lock(&s->lock);
276 offset = block_status(s, sector_num, nb_sectors, pnum);
277 qemu_co_mutex_unlock(&s->lock);
278
279 if (offset < 0) {
280 return 0;
281 }
282
283 *file = bs->file->bs;
284 return (offset << BDRV_SECTOR_BITS) |
285 BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
286 }
287
288 static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
289 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
290 {
291 BDRVParallelsState *s = bs->opaque;
292 uint64_t bytes_done = 0;
293 QEMUIOVector hd_qiov;
294 int ret = 0;
295
296 qemu_iovec_init(&hd_qiov, qiov->niov);
297
298 while (nb_sectors > 0) {
299 int64_t position;
300 int n, nbytes;
301
302 qemu_co_mutex_lock(&s->lock);
303 position = allocate_clusters(bs, sector_num, nb_sectors, &n);
304 qemu_co_mutex_unlock(&s->lock);
305 if (position < 0) {
306 ret = (int)position;
307 break;
308 }
309
310 nbytes = n << BDRV_SECTOR_BITS;
311
312 qemu_iovec_reset(&hd_qiov);
313 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
314
315 ret = bdrv_co_writev(bs->file, position, n, &hd_qiov);
316 if (ret < 0) {
317 break;
318 }
319
320 nb_sectors -= n;
321 sector_num += n;
322 bytes_done += nbytes;
323 }
324
325 qemu_iovec_destroy(&hd_qiov);
326 return ret;
327 }
328
329 static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
330 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
331 {
332 BDRVParallelsState *s = bs->opaque;
333 uint64_t bytes_done = 0;
334 QEMUIOVector hd_qiov;
335 int ret = 0;
336
337 qemu_iovec_init(&hd_qiov, qiov->niov);
338
339 while (nb_sectors > 0) {
340 int64_t position;
341 int n, nbytes;
342
343 qemu_co_mutex_lock(&s->lock);
344 position = block_status(s, sector_num, nb_sectors, &n);
345 qemu_co_mutex_unlock(&s->lock);
346
347 nbytes = n << BDRV_SECTOR_BITS;
348
349 if (position < 0) {
350 qemu_iovec_memset(qiov, bytes_done, 0, nbytes);
351 } else {
352 qemu_iovec_reset(&hd_qiov);
353 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
354
355 ret = bdrv_co_readv(bs->file, position, n, &hd_qiov);
356 if (ret < 0) {
357 break;
358 }
359 }
360
361 nb_sectors -= n;
362 sector_num += n;
363 bytes_done += nbytes;
364 }
365
366 qemu_iovec_destroy(&hd_qiov);
367 return ret;
368 }
369
370
371 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res,
372 BdrvCheckMode fix)
373 {
374 BDRVParallelsState *s = bs->opaque;
375 int64_t size, prev_off, high_off;
376 int ret;
377 uint32_t i;
378 bool flush_bat = false;
379 int cluster_size = s->tracks << BDRV_SECTOR_BITS;
380
381 size = bdrv_getlength(bs->file->bs);
382 if (size < 0) {
383 res->check_errors++;
384 return size;
385 }
386
387 if (s->header_unclean) {
388 fprintf(stderr, "%s image was not closed correctly\n",
389 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
390 res->corruptions++;
391 if (fix & BDRV_FIX_ERRORS) {
392 /* parallels_close will do the job right */
393 res->corruptions_fixed++;
394 s->header_unclean = false;
395 }
396 }
397
398 res->bfi.total_clusters = s->bat_size;
399 res->bfi.compressed_clusters = 0; /* compression is not supported */
400
401 high_off = 0;
402 prev_off = 0;
403 for (i = 0; i < s->bat_size; i++) {
404 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS;
405 if (off == 0) {
406 prev_off = 0;
407 continue;
408 }
409
410 /* cluster outside the image */
411 if (off > size) {
412 fprintf(stderr, "%s cluster %u is outside image\n",
413 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
414 res->corruptions++;
415 if (fix & BDRV_FIX_ERRORS) {
416 prev_off = 0;
417 s->bat_bitmap[i] = 0;
418 res->corruptions_fixed++;
419 flush_bat = true;
420 continue;
421 }
422 }
423
424 res->bfi.allocated_clusters++;
425 if (off > high_off) {
426 high_off = off;
427 }
428
429 if (prev_off != 0 && (prev_off + cluster_size) != off) {
430 res->bfi.fragmented_clusters++;
431 }
432 prev_off = off;
433 }
434
435 if (flush_bat) {
436 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size);
437 if (ret < 0) {
438 res->check_errors++;
439 return ret;
440 }
441 }
442
443 res->image_end_offset = high_off + cluster_size;
444 if (size > res->image_end_offset) {
445 int64_t count;
446 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size);
447 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
448 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
449 size - res->image_end_offset);
450 res->leaks += count;
451 if (fix & BDRV_FIX_LEAKS) {
452 ret = bdrv_truncate(bs->file, res->image_end_offset);
453 if (ret < 0) {
454 res->check_errors++;
455 return ret;
456 }
457 res->leaks_fixed += count;
458 }
459 }
460
461 return 0;
462 }
463
464
465 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
466 {
467 int64_t total_size, cl_size;
468 uint8_t tmp[BDRV_SECTOR_SIZE];
469 Error *local_err = NULL;
470 BlockBackend *file;
471 uint32_t bat_entries, bat_sectors;
472 ParallelsHeader header;
473 int ret;
474
475 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
476 BDRV_SECTOR_SIZE);
477 cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
478 DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE);
479 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) {
480 error_propagate(errp, local_err);
481 return -E2BIG;
482 }
483
484 ret = bdrv_create_file(filename, opts, &local_err);
485 if (ret < 0) {
486 error_propagate(errp, local_err);
487 return ret;
488 }
489
490 file = blk_new_open(filename, NULL, NULL,
491 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
492 &local_err);
493 if (file == NULL) {
494 error_propagate(errp, local_err);
495 return -EIO;
496 }
497
498 blk_set_allow_write_beyond_eof(file, true);
499
500 ret = blk_truncate(file, 0);
501 if (ret < 0) {
502 goto exit;
503 }
504
505 bat_entries = DIV_ROUND_UP(total_size, cl_size);
506 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size);
507 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS;
508
509 memset(&header, 0, sizeof(header));
510 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
511 header.version = cpu_to_le32(HEADER_VERSION);
512 /* don't care much about geometry, it is not used on image level */
513 header.heads = cpu_to_le32(16);
514 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32);
515 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
516 header.bat_entries = cpu_to_le32(bat_entries);
517 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
518 header.data_off = cpu_to_le32(bat_sectors);
519
520 /* write all the data */
521 memset(tmp, 0, sizeof(tmp));
522 memcpy(tmp, &header, sizeof(header));
523
524 ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0);
525 if (ret < 0) {
526 goto exit;
527 }
528 ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE,
529 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0);
530 if (ret < 0) {
531 goto exit;
532 }
533 ret = 0;
534
535 done:
536 blk_unref(file);
537 return ret;
538
539 exit:
540 error_setg_errno(errp, -ret, "Failed to create Parallels image");
541 goto done;
542 }
543
544
545 static int parallels_probe(const uint8_t *buf, int buf_size,
546 const char *filename)
547 {
548 const ParallelsHeader *ph = (const void *)buf;
549
550 if (buf_size < sizeof(ParallelsHeader)) {
551 return 0;
552 }
553
554 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) ||
555 !memcmp(ph->magic, HEADER_MAGIC2, 16)) &&
556 (le32_to_cpu(ph->version) == HEADER_VERSION)) {
557 return 100;
558 }
559
560 return 0;
561 }
562
563 static int parallels_update_header(BlockDriverState *bs)
564 {
565 BDRVParallelsState *s = bs->opaque;
566 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs),
567 sizeof(ParallelsHeader));
568
569 if (size > s->header_size) {
570 size = s->header_size;
571 }
572 return bdrv_pwrite_sync(bs->file, 0, s->header, size);
573 }
574
575 static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
576 Error **errp)
577 {
578 BDRVParallelsState *s = bs->opaque;
579 ParallelsHeader ph;
580 int ret, size, i;
581 QemuOpts *opts = NULL;
582 Error *local_err = NULL;
583 char *buf;
584
585 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
586 false, errp);
587 if (!bs->file) {
588 return -EINVAL;
589 }
590
591 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
592 if (ret < 0) {
593 goto fail;
594 }
595
596 bs->total_sectors = le64_to_cpu(ph.nb_sectors);
597
598 if (le32_to_cpu(ph.version) != HEADER_VERSION) {
599 goto fail_format;
600 }
601 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) {
602 s->off_multiplier = 1;
603 bs->total_sectors = 0xffffffff & bs->total_sectors;
604 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) {
605 s->off_multiplier = le32_to_cpu(ph.tracks);
606 } else {
607 goto fail_format;
608 }
609
610 s->tracks = le32_to_cpu(ph.tracks);
611 if (s->tracks == 0) {
612 error_setg(errp, "Invalid image: Zero sectors per track");
613 ret = -EINVAL;
614 goto fail;
615 }
616 if (s->tracks > INT32_MAX/513) {
617 error_setg(errp, "Invalid image: Too big cluster");
618 ret = -EFBIG;
619 goto fail;
620 }
621
622 s->bat_size = le32_to_cpu(ph.bat_entries);
623 if (s->bat_size > INT_MAX / sizeof(uint32_t)) {
624 error_setg(errp, "Catalog too large");
625 ret = -EFBIG;
626 goto fail;
627 }
628
629 size = bat_entry_off(s->bat_size);
630 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs));
631 s->header = qemu_try_blockalign(bs->file->bs, s->header_size);
632 if (s->header == NULL) {
633 ret = -ENOMEM;
634 goto fail;
635 }
636 s->data_end = le32_to_cpu(ph.data_off);
637 if (s->data_end == 0) {
638 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE);
639 }
640 if (s->data_end < s->header_size) {
641 /* there is not enough unused space to fit to block align between BAT
642 and actual data. We can't avoid read-modify-write... */
643 s->header_size = size;
644 }
645
646 ret = bdrv_pread(bs->file, 0, s->header, s->header_size);
647 if (ret < 0) {
648 goto fail;
649 }
650 s->bat_bitmap = (uint32_t *)(s->header + 1);
651
652 for (i = 0; i < s->bat_size; i++) {
653 int64_t off = bat2sect(s, i);
654 if (off >= s->data_end) {
655 s->data_end = off + s->tracks;
656 }
657 }
658
659 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
660 /* Image was not closed correctly. The check is mandatory */
661 s->header_unclean = true;
662 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) {
663 error_setg(errp, "parallels: Image was not closed correctly; "
664 "cannot be opened read/write");
665 ret = -EACCES;
666 goto fail;
667 }
668 }
669
670 opts = qemu_opts_create(&parallels_runtime_opts, NULL, 0, &local_err);
671 if (local_err != NULL) {
672 goto fail_options;
673 }
674
675 qemu_opts_absorb_qdict(opts, options, &local_err);
676 if (local_err != NULL) {
677 goto fail_options;
678 }
679
680 s->prealloc_size =
681 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0);
682 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS);
683 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE);
684 s->prealloc_mode = qapi_enum_parse(prealloc_mode_lookup, buf,
685 PRL_PREALLOC_MODE__MAX, PRL_PREALLOC_MODE_FALLOCATE, &local_err);
686 g_free(buf);
687 if (local_err != NULL) {
688 goto fail_options;
689 }
690 if (!bdrv_has_zero_init(bs->file->bs) ||
691 bdrv_truncate(bs->file, bdrv_getlength(bs->file->bs)) != 0) {
692 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
693 }
694
695 if (flags & BDRV_O_RDWR) {
696 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
697 ret = parallels_update_header(bs);
698 if (ret < 0) {
699 goto fail;
700 }
701 }
702
703 s->bat_dirty_block = 4 * getpagesize();
704 s->bat_dirty_bmap =
705 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block));
706
707 qemu_co_mutex_init(&s->lock);
708 return 0;
709
710 fail_format:
711 error_setg(errp, "Image not in Parallels format");
712 ret = -EINVAL;
713 fail:
714 qemu_vfree(s->header);
715 return ret;
716
717 fail_options:
718 error_propagate(errp, local_err);
719 ret = -EINVAL;
720 goto fail;
721 }
722
723
724 static void parallels_close(BlockDriverState *bs)
725 {
726 BDRVParallelsState *s = bs->opaque;
727
728 if (bs->open_flags & BDRV_O_RDWR) {
729 s->header->inuse = 0;
730 parallels_update_header(bs);
731 }
732
733 if (bs->open_flags & BDRV_O_RDWR) {
734 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS);
735 }
736
737 g_free(s->bat_dirty_bmap);
738 qemu_vfree(s->header);
739 }
740
741 static QemuOptsList parallels_create_opts = {
742 .name = "parallels-create-opts",
743 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
744 .desc = {
745 {
746 .name = BLOCK_OPT_SIZE,
747 .type = QEMU_OPT_SIZE,
748 .help = "Virtual disk size",
749 },
750 {
751 .name = BLOCK_OPT_CLUSTER_SIZE,
752 .type = QEMU_OPT_SIZE,
753 .help = "Parallels image cluster size",
754 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
755 },
756 { /* end of list */ }
757 }
758 };
759
760 static BlockDriver bdrv_parallels = {
761 .format_name = "parallels",
762 .instance_size = sizeof(BDRVParallelsState),
763 .bdrv_probe = parallels_probe,
764 .bdrv_open = parallels_open,
765 .bdrv_close = parallels_close,
766 .bdrv_child_perm = bdrv_format_default_perms,
767 .bdrv_co_get_block_status = parallels_co_get_block_status,
768 .bdrv_has_zero_init = bdrv_has_zero_init_1,
769 .bdrv_co_flush_to_os = parallels_co_flush_to_os,
770 .bdrv_co_readv = parallels_co_readv,
771 .bdrv_co_writev = parallels_co_writev,
772
773 .bdrv_create = parallels_create,
774 .bdrv_check = parallels_check,
775 .create_opts = &parallels_create_opts,
776 };
777
778 static void bdrv_parallels_init(void)
779 {
780 bdrv_register(&bdrv_parallels);
781 }
782
783 block_init(bdrv_parallels_init);