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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 | ||
31 | #include "qemu/osdep.h" | |
32 | #include "qemu/error-report.h" | |
33 | #include "qapi/error.h" | |
34 | #include "block/block_int.h" | |
35 | #include "block/qdict.h" | |
36 | #include "sysemu/block-backend.h" | |
37 | #include "qemu/module.h" | |
38 | #include "qemu/option.h" | |
39 | #include "qapi/qmp/qdict.h" | |
40 | #include "qapi/qobject-input-visitor.h" | |
41 | #include "qapi/qapi-visit-block-core.h" | |
42 | #include "qemu/bswap.h" | |
43 | #include "qemu/bitmap.h" | |
44 | #include "qemu/memalign.h" | |
45 | #include "migration/blocker.h" | |
46 | #include "parallels.h" | |
47 | ||
48 | /**************************************************************/ | |
49 | ||
50 | #define HEADER_MAGIC "WithoutFreeSpace" | |
51 | #define HEADER_MAGIC2 "WithouFreSpacExt" | |
52 | #define HEADER_VERSION 2 | |
53 | #define HEADER_INUSE_MAGIC (0x746F6E59) | |
54 | #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32) | |
55 | ||
56 | static QEnumLookup prealloc_mode_lookup = { | |
57 | .array = (const char *const[]) { | |
58 | "falloc", | |
59 | "truncate", | |
60 | }, | |
61 | .size = PRL_PREALLOC_MODE__MAX | |
62 | }; | |
63 | ||
64 | #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" | |
65 | #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" | |
66 | ||
67 | static QemuOptsList parallels_runtime_opts = { | |
68 | .name = "parallels", | |
69 | .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head), | |
70 | .desc = { | |
71 | { | |
72 | .name = PARALLELS_OPT_PREALLOC_SIZE, | |
73 | .type = QEMU_OPT_SIZE, | |
74 | .help = "Preallocation size on image expansion", | |
75 | .def_value_str = "128M", | |
76 | }, | |
77 | { | |
78 | .name = PARALLELS_OPT_PREALLOC_MODE, | |
79 | .type = QEMU_OPT_STRING, | |
80 | .help = "Preallocation mode on image expansion " | |
81 | "(allowed values: falloc, truncate)", | |
82 | .def_value_str = "falloc", | |
83 | }, | |
84 | { /* end of list */ }, | |
85 | }, | |
86 | }; | |
87 | ||
88 | static QemuOptsList parallels_create_opts = { | |
89 | .name = "parallels-create-opts", | |
90 | .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), | |
91 | .desc = { | |
92 | { | |
93 | .name = BLOCK_OPT_SIZE, | |
94 | .type = QEMU_OPT_SIZE, | |
95 | .help = "Virtual disk size", | |
96 | }, | |
97 | { | |
98 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
99 | .type = QEMU_OPT_SIZE, | |
100 | .help = "Parallels image cluster size", | |
101 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), | |
102 | }, | |
103 | { /* end of list */ } | |
104 | } | |
105 | }; | |
106 | ||
107 | ||
108 | static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) | |
109 | { | |
110 | return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; | |
111 | } | |
112 | ||
113 | static uint32_t bat_entry_off(uint32_t idx) | |
114 | { | |
115 | return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; | |
116 | } | |
117 | ||
118 | static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) | |
119 | { | |
120 | uint32_t index, offset; | |
121 | ||
122 | index = sector_num / s->tracks; | |
123 | offset = sector_num % s->tracks; | |
124 | ||
125 | /* not allocated */ | |
126 | if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { | |
127 | return -1; | |
128 | } | |
129 | return bat2sect(s, index) + offset; | |
130 | } | |
131 | ||
132 | static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num, | |
133 | int nb_sectors) | |
134 | { | |
135 | int ret = s->tracks - sector_num % s->tracks; | |
136 | return MIN(nb_sectors, ret); | |
137 | } | |
138 | ||
139 | static int64_t block_status(BDRVParallelsState *s, int64_t sector_num, | |
140 | int nb_sectors, int *pnum) | |
141 | { | |
142 | int64_t start_off = -2, prev_end_off = -2; | |
143 | ||
144 | *pnum = 0; | |
145 | while (nb_sectors > 0 || start_off == -2) { | |
146 | int64_t offset = seek_to_sector(s, sector_num); | |
147 | int to_end; | |
148 | ||
149 | if (start_off == -2) { | |
150 | start_off = offset; | |
151 | prev_end_off = offset; | |
152 | } else if (offset != prev_end_off) { | |
153 | break; | |
154 | } | |
155 | ||
156 | to_end = cluster_remainder(s, sector_num, nb_sectors); | |
157 | nb_sectors -= to_end; | |
158 | sector_num += to_end; | |
159 | *pnum += to_end; | |
160 | ||
161 | if (offset > 0) { | |
162 | prev_end_off += to_end; | |
163 | } | |
164 | } | |
165 | return start_off; | |
166 | } | |
167 | ||
168 | static int64_t coroutine_fn GRAPH_RDLOCK | |
169 | allocate_clusters(BlockDriverState *bs, int64_t sector_num, | |
170 | int nb_sectors, int *pnum) | |
171 | { | |
172 | int ret = 0; | |
173 | BDRVParallelsState *s = bs->opaque; | |
174 | int64_t pos, space, idx, to_allocate, i, len; | |
175 | ||
176 | pos = block_status(s, sector_num, nb_sectors, pnum); | |
177 | if (pos > 0) { | |
178 | return pos; | |
179 | } | |
180 | ||
181 | idx = sector_num / s->tracks; | |
182 | to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; | |
183 | ||
184 | /* This function is called only by parallels_co_writev(), which will never | |
185 | * pass a sector_num at or beyond the end of the image (because the block | |
186 | * layer never passes such a sector_num to that function). Therefore, idx | |
187 | * is always below s->bat_size. | |
188 | * block_status() will limit *pnum so that sector_num + *pnum will not | |
189 | * exceed the image end. Therefore, idx + to_allocate cannot exceed | |
190 | * s->bat_size. | |
191 | * Note that s->bat_size is an unsigned int, therefore idx + to_allocate | |
192 | * will always fit into a uint32_t. */ | |
193 | assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); | |
194 | ||
195 | space = to_allocate * s->tracks; | |
196 | len = bdrv_getlength(bs->file->bs); | |
197 | if (len < 0) { | |
198 | return len; | |
199 | } | |
200 | if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { | |
201 | space += s->prealloc_size; | |
202 | /* | |
203 | * We require the expanded size to read back as zero. If the | |
204 | * user permitted truncation, we try that; but if it fails, we | |
205 | * force the safer-but-slower fallocate. | |
206 | */ | |
207 | if (s->prealloc_mode == PRL_PREALLOC_MODE_TRUNCATE) { | |
208 | ret = bdrv_co_truncate(bs->file, | |
209 | (s->data_end + space) << BDRV_SECTOR_BITS, | |
210 | false, PREALLOC_MODE_OFF, | |
211 | BDRV_REQ_ZERO_WRITE, NULL); | |
212 | if (ret == -ENOTSUP) { | |
213 | s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; | |
214 | } | |
215 | } | |
216 | if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { | |
217 | ret = bdrv_co_pwrite_zeroes(bs->file, | |
218 | s->data_end << BDRV_SECTOR_BITS, | |
219 | space << BDRV_SECTOR_BITS, 0); | |
220 | } | |
221 | if (ret < 0) { | |
222 | return ret; | |
223 | } | |
224 | } | |
225 | ||
226 | /* Try to read from backing to fill empty clusters | |
227 | * FIXME: 1. previous write_zeroes may be redundant | |
228 | * 2. most of data we read from backing will be rewritten by | |
229 | * parallels_co_writev. On aligned-to-cluster write we do not need | |
230 | * this read at all. | |
231 | * 3. it would be good to combine write of data from backing and new | |
232 | * data into one write call */ | |
233 | if (bs->backing) { | |
234 | int64_t nb_cow_sectors = to_allocate * s->tracks; | |
235 | int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS; | |
236 | void *buf = qemu_blockalign(bs, nb_cow_bytes); | |
237 | ||
238 | ret = bdrv_co_pread(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE, | |
239 | nb_cow_bytes, buf, 0); | |
240 | if (ret < 0) { | |
241 | qemu_vfree(buf); | |
242 | return ret; | |
243 | } | |
244 | ||
245 | ret = bdrv_co_pwrite(bs->file, s->data_end * BDRV_SECTOR_SIZE, | |
246 | nb_cow_bytes, buf, 0); | |
247 | qemu_vfree(buf); | |
248 | if (ret < 0) { | |
249 | return ret; | |
250 | } | |
251 | } | |
252 | ||
253 | for (i = 0; i < to_allocate; i++) { | |
254 | s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); | |
255 | s->data_end += s->tracks; | |
256 | bitmap_set(s->bat_dirty_bmap, | |
257 | bat_entry_off(idx + i) / s->bat_dirty_block, 1); | |
258 | } | |
259 | ||
260 | return bat2sect(s, idx) + sector_num % s->tracks; | |
261 | } | |
262 | ||
263 | ||
264 | static int coroutine_fn GRAPH_RDLOCK | |
265 | parallels_co_flush_to_os(BlockDriverState *bs) | |
266 | { | |
267 | BDRVParallelsState *s = bs->opaque; | |
268 | unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); | |
269 | unsigned long bit; | |
270 | ||
271 | qemu_co_mutex_lock(&s->lock); | |
272 | ||
273 | bit = find_first_bit(s->bat_dirty_bmap, size); | |
274 | while (bit < size) { | |
275 | uint32_t off = bit * s->bat_dirty_block; | |
276 | uint32_t to_write = s->bat_dirty_block; | |
277 | int ret; | |
278 | ||
279 | if (off + to_write > s->header_size) { | |
280 | to_write = s->header_size - off; | |
281 | } | |
282 | ret = bdrv_co_pwrite(bs->file, off, to_write, | |
283 | (uint8_t *)s->header + off, 0); | |
284 | if (ret < 0) { | |
285 | qemu_co_mutex_unlock(&s->lock); | |
286 | return ret; | |
287 | } | |
288 | bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); | |
289 | } | |
290 | bitmap_zero(s->bat_dirty_bmap, size); | |
291 | ||
292 | qemu_co_mutex_unlock(&s->lock); | |
293 | return 0; | |
294 | } | |
295 | ||
296 | ||
297 | static int coroutine_fn parallels_co_block_status(BlockDriverState *bs, | |
298 | bool want_zero, | |
299 | int64_t offset, | |
300 | int64_t bytes, | |
301 | int64_t *pnum, | |
302 | int64_t *map, | |
303 | BlockDriverState **file) | |
304 | { | |
305 | BDRVParallelsState *s = bs->opaque; | |
306 | int count; | |
307 | ||
308 | assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE)); | |
309 | qemu_co_mutex_lock(&s->lock); | |
310 | offset = block_status(s, offset >> BDRV_SECTOR_BITS, | |
311 | bytes >> BDRV_SECTOR_BITS, &count); | |
312 | qemu_co_mutex_unlock(&s->lock); | |
313 | ||
314 | *pnum = count * BDRV_SECTOR_SIZE; | |
315 | if (offset < 0) { | |
316 | return 0; | |
317 | } | |
318 | ||
319 | *map = offset * BDRV_SECTOR_SIZE; | |
320 | *file = bs->file->bs; | |
321 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; | |
322 | } | |
323 | ||
324 | static int coroutine_fn GRAPH_RDLOCK | |
325 | parallels_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
326 | QEMUIOVector *qiov, int flags) | |
327 | { | |
328 | BDRVParallelsState *s = bs->opaque; | |
329 | uint64_t bytes_done = 0; | |
330 | QEMUIOVector hd_qiov; | |
331 | int ret = 0; | |
332 | ||
333 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
334 | ||
335 | while (nb_sectors > 0) { | |
336 | int64_t position; | |
337 | int n, nbytes; | |
338 | ||
339 | qemu_co_mutex_lock(&s->lock); | |
340 | position = allocate_clusters(bs, sector_num, nb_sectors, &n); | |
341 | qemu_co_mutex_unlock(&s->lock); | |
342 | if (position < 0) { | |
343 | ret = (int)position; | |
344 | break; | |
345 | } | |
346 | ||
347 | nbytes = n << BDRV_SECTOR_BITS; | |
348 | ||
349 | qemu_iovec_reset(&hd_qiov); | |
350 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); | |
351 | ||
352 | ret = bdrv_co_pwritev(bs->file, position * BDRV_SECTOR_SIZE, nbytes, | |
353 | &hd_qiov, 0); | |
354 | if (ret < 0) { | |
355 | break; | |
356 | } | |
357 | ||
358 | nb_sectors -= n; | |
359 | sector_num += n; | |
360 | bytes_done += nbytes; | |
361 | } | |
362 | ||
363 | qemu_iovec_destroy(&hd_qiov); | |
364 | return ret; | |
365 | } | |
366 | ||
367 | static int coroutine_fn GRAPH_RDLOCK | |
368 | parallels_co_readv(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
369 | QEMUIOVector *qiov) | |
370 | { | |
371 | BDRVParallelsState *s = bs->opaque; | |
372 | uint64_t bytes_done = 0; | |
373 | QEMUIOVector hd_qiov; | |
374 | int ret = 0; | |
375 | ||
376 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
377 | ||
378 | while (nb_sectors > 0) { | |
379 | int64_t position; | |
380 | int n, nbytes; | |
381 | ||
382 | qemu_co_mutex_lock(&s->lock); | |
383 | position = block_status(s, sector_num, nb_sectors, &n); | |
384 | qemu_co_mutex_unlock(&s->lock); | |
385 | ||
386 | nbytes = n << BDRV_SECTOR_BITS; | |
387 | ||
388 | qemu_iovec_reset(&hd_qiov); | |
389 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); | |
390 | ||
391 | if (position < 0) { | |
392 | if (bs->backing) { | |
393 | ret = bdrv_co_preadv(bs->backing, sector_num * BDRV_SECTOR_SIZE, | |
394 | nbytes, &hd_qiov, 0); | |
395 | if (ret < 0) { | |
396 | break; | |
397 | } | |
398 | } else { | |
399 | qemu_iovec_memset(&hd_qiov, 0, 0, nbytes); | |
400 | } | |
401 | } else { | |
402 | ret = bdrv_co_preadv(bs->file, position * BDRV_SECTOR_SIZE, nbytes, | |
403 | &hd_qiov, 0); | |
404 | if (ret < 0) { | |
405 | break; | |
406 | } | |
407 | } | |
408 | ||
409 | nb_sectors -= n; | |
410 | sector_num += n; | |
411 | bytes_done += nbytes; | |
412 | } | |
413 | ||
414 | qemu_iovec_destroy(&hd_qiov); | |
415 | return ret; | |
416 | } | |
417 | ||
418 | ||
419 | static int coroutine_fn GRAPH_RDLOCK | |
420 | parallels_co_check(BlockDriverState *bs, BdrvCheckResult *res, | |
421 | BdrvCheckMode fix) | |
422 | { | |
423 | BDRVParallelsState *s = bs->opaque; | |
424 | int64_t size, prev_off, high_off; | |
425 | int ret; | |
426 | uint32_t i; | |
427 | bool flush_bat = false; | |
428 | ||
429 | size = bdrv_getlength(bs->file->bs); | |
430 | if (size < 0) { | |
431 | res->check_errors++; | |
432 | return size; | |
433 | } | |
434 | ||
435 | qemu_co_mutex_lock(&s->lock); | |
436 | if (s->header_unclean) { | |
437 | fprintf(stderr, "%s image was not closed correctly\n", | |
438 | fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); | |
439 | res->corruptions++; | |
440 | if (fix & BDRV_FIX_ERRORS) { | |
441 | /* parallels_close will do the job right */ | |
442 | res->corruptions_fixed++; | |
443 | s->header_unclean = false; | |
444 | } | |
445 | } | |
446 | ||
447 | res->bfi.total_clusters = s->bat_size; | |
448 | res->bfi.compressed_clusters = 0; /* compression is not supported */ | |
449 | ||
450 | high_off = 0; | |
451 | prev_off = 0; | |
452 | for (i = 0; i < s->bat_size; i++) { | |
453 | int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; | |
454 | if (off == 0) { | |
455 | prev_off = 0; | |
456 | continue; | |
457 | } | |
458 | ||
459 | /* cluster outside the image */ | |
460 | if (off > size) { | |
461 | fprintf(stderr, "%s cluster %u is outside image\n", | |
462 | fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); | |
463 | res->corruptions++; | |
464 | if (fix & BDRV_FIX_ERRORS) { | |
465 | prev_off = 0; | |
466 | s->bat_bitmap[i] = 0; | |
467 | res->corruptions_fixed++; | |
468 | flush_bat = true; | |
469 | continue; | |
470 | } | |
471 | } | |
472 | ||
473 | res->bfi.allocated_clusters++; | |
474 | if (off > high_off) { | |
475 | high_off = off; | |
476 | } | |
477 | ||
478 | if (prev_off != 0 && (prev_off + s->cluster_size) != off) { | |
479 | res->bfi.fragmented_clusters++; | |
480 | } | |
481 | prev_off = off; | |
482 | } | |
483 | ||
484 | ret = 0; | |
485 | if (flush_bat) { | |
486 | ret = bdrv_co_pwrite_sync(bs->file, 0, s->header_size, s->header, 0); | |
487 | if (ret < 0) { | |
488 | res->check_errors++; | |
489 | goto out; | |
490 | } | |
491 | } | |
492 | ||
493 | res->image_end_offset = high_off + s->cluster_size; | |
494 | if (size > res->image_end_offset) { | |
495 | int64_t count; | |
496 | count = DIV_ROUND_UP(size - res->image_end_offset, s->cluster_size); | |
497 | fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", | |
498 | fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", | |
499 | size - res->image_end_offset); | |
500 | res->leaks += count; | |
501 | if (fix & BDRV_FIX_LEAKS) { | |
502 | Error *local_err = NULL; | |
503 | ||
504 | /* | |
505 | * In order to really repair the image, we must shrink it. | |
506 | * That means we have to pass exact=true. | |
507 | */ | |
508 | ret = bdrv_co_truncate(bs->file, res->image_end_offset, true, | |
509 | PREALLOC_MODE_OFF, 0, &local_err); | |
510 | if (ret < 0) { | |
511 | error_report_err(local_err); | |
512 | res->check_errors++; | |
513 | goto out; | |
514 | } | |
515 | res->leaks_fixed += count; | |
516 | } | |
517 | } | |
518 | ||
519 | out: | |
520 | qemu_co_mutex_unlock(&s->lock); | |
521 | return ret; | |
522 | } | |
523 | ||
524 | ||
525 | static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts, | |
526 | Error **errp) | |
527 | { | |
528 | BlockdevCreateOptionsParallels *parallels_opts; | |
529 | BlockDriverState *bs; | |
530 | BlockBackend *blk; | |
531 | int64_t total_size, cl_size; | |
532 | uint32_t bat_entries, bat_sectors; | |
533 | ParallelsHeader header; | |
534 | uint8_t tmp[BDRV_SECTOR_SIZE]; | |
535 | int ret; | |
536 | ||
537 | assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS); | |
538 | parallels_opts = &opts->u.parallels; | |
539 | ||
540 | /* Sanity checks */ | |
541 | total_size = parallels_opts->size; | |
542 | ||
543 | if (parallels_opts->has_cluster_size) { | |
544 | cl_size = parallels_opts->cluster_size; | |
545 | } else { | |
546 | cl_size = DEFAULT_CLUSTER_SIZE; | |
547 | } | |
548 | ||
549 | /* XXX What is the real limit here? This is an insanely large maximum. */ | |
550 | if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) { | |
551 | error_setg(errp, "Cluster size is too large"); | |
552 | return -EINVAL; | |
553 | } | |
554 | if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { | |
555 | error_setg(errp, "Image size is too large for this cluster size"); | |
556 | return -E2BIG; | |
557 | } | |
558 | ||
559 | if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) { | |
560 | error_setg(errp, "Image size must be a multiple of 512 bytes"); | |
561 | return -EINVAL; | |
562 | } | |
563 | ||
564 | if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) { | |
565 | error_setg(errp, "Cluster size must be a multiple of 512 bytes"); | |
566 | return -EINVAL; | |
567 | } | |
568 | ||
569 | /* Create BlockBackend to write to the image */ | |
570 | bs = bdrv_co_open_blockdev_ref(parallels_opts->file, errp); | |
571 | if (bs == NULL) { | |
572 | return -EIO; | |
573 | } | |
574 | ||
575 | blk = blk_co_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL, | |
576 | errp); | |
577 | if (!blk) { | |
578 | ret = -EPERM; | |
579 | goto out; | |
580 | } | |
581 | blk_set_allow_write_beyond_eof(blk, true); | |
582 | ||
583 | /* Create image format */ | |
584 | bat_entries = DIV_ROUND_UP(total_size, cl_size); | |
585 | bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); | |
586 | bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; | |
587 | ||
588 | memset(&header, 0, sizeof(header)); | |
589 | memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); | |
590 | header.version = cpu_to_le32(HEADER_VERSION); | |
591 | /* don't care much about geometry, it is not used on image level */ | |
592 | header.heads = cpu_to_le32(HEADS_NUMBER); | |
593 | header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE | |
594 | / HEADS_NUMBER / SEC_IN_CYL); | |
595 | header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); | |
596 | header.bat_entries = cpu_to_le32(bat_entries); | |
597 | header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); | |
598 | header.data_off = cpu_to_le32(bat_sectors); | |
599 | ||
600 | /* write all the data */ | |
601 | memset(tmp, 0, sizeof(tmp)); | |
602 | memcpy(tmp, &header, sizeof(header)); | |
603 | ||
604 | ret = blk_co_pwrite(blk, 0, BDRV_SECTOR_SIZE, tmp, 0); | |
605 | if (ret < 0) { | |
606 | goto exit; | |
607 | } | |
608 | ret = blk_co_pwrite_zeroes(blk, BDRV_SECTOR_SIZE, | |
609 | (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); | |
610 | if (ret < 0) { | |
611 | goto exit; | |
612 | } | |
613 | ||
614 | ret = 0; | |
615 | out: | |
616 | blk_unref(blk); | |
617 | bdrv_unref(bs); | |
618 | return ret; | |
619 | ||
620 | exit: | |
621 | error_setg_errno(errp, -ret, "Failed to create Parallels image"); | |
622 | goto out; | |
623 | } | |
624 | ||
625 | static int coroutine_fn parallels_co_create_opts(BlockDriver *drv, | |
626 | const char *filename, | |
627 | QemuOpts *opts, | |
628 | Error **errp) | |
629 | { | |
630 | BlockdevCreateOptions *create_options = NULL; | |
631 | BlockDriverState *bs = NULL; | |
632 | QDict *qdict; | |
633 | Visitor *v; | |
634 | int ret; | |
635 | ||
636 | static const QDictRenames opt_renames[] = { | |
637 | { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" }, | |
638 | { NULL, NULL }, | |
639 | }; | |
640 | ||
641 | /* Parse options and convert legacy syntax */ | |
642 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, ¶llels_create_opts, | |
643 | true); | |
644 | ||
645 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { | |
646 | ret = -EINVAL; | |
647 | goto done; | |
648 | } | |
649 | ||
650 | /* Create and open the file (protocol layer) */ | |
651 | ret = bdrv_co_create_file(filename, opts, errp); | |
652 | if (ret < 0) { | |
653 | goto done; | |
654 | } | |
655 | ||
656 | bs = bdrv_co_open(filename, NULL, NULL, | |
657 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); | |
658 | if (bs == NULL) { | |
659 | ret = -EIO; | |
660 | goto done; | |
661 | } | |
662 | ||
663 | /* Now get the QAPI type BlockdevCreateOptions */ | |
664 | qdict_put_str(qdict, "driver", "parallels"); | |
665 | qdict_put_str(qdict, "file", bs->node_name); | |
666 | ||
667 | v = qobject_input_visitor_new_flat_confused(qdict, errp); | |
668 | if (!v) { | |
669 | ret = -EINVAL; | |
670 | goto done; | |
671 | } | |
672 | ||
673 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); | |
674 | visit_free(v); | |
675 | if (!create_options) { | |
676 | ret = -EINVAL; | |
677 | goto done; | |
678 | } | |
679 | ||
680 | /* Silently round up sizes */ | |
681 | create_options->u.parallels.size = | |
682 | ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE); | |
683 | create_options->u.parallels.cluster_size = | |
684 | ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE); | |
685 | ||
686 | /* Create the Parallels image (format layer) */ | |
687 | ret = parallels_co_create(create_options, errp); | |
688 | if (ret < 0) { | |
689 | goto done; | |
690 | } | |
691 | ret = 0; | |
692 | ||
693 | done: | |
694 | qobject_unref(qdict); | |
695 | bdrv_unref(bs); | |
696 | qapi_free_BlockdevCreateOptions(create_options); | |
697 | return ret; | |
698 | } | |
699 | ||
700 | ||
701 | static int parallels_probe(const uint8_t *buf, int buf_size, | |
702 | const char *filename) | |
703 | { | |
704 | const ParallelsHeader *ph = (const void *)buf; | |
705 | ||
706 | if (buf_size < sizeof(ParallelsHeader)) { | |
707 | return 0; | |
708 | } | |
709 | ||
710 | if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || | |
711 | !memcmp(ph->magic, HEADER_MAGIC2, 16)) && | |
712 | (le32_to_cpu(ph->version) == HEADER_VERSION)) { | |
713 | return 100; | |
714 | } | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | static int parallels_update_header(BlockDriverState *bs) | |
720 | { | |
721 | BDRVParallelsState *s = bs->opaque; | |
722 | unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), | |
723 | sizeof(ParallelsHeader)); | |
724 | ||
725 | if (size > s->header_size) { | |
726 | size = s->header_size; | |
727 | } | |
728 | return bdrv_pwrite_sync(bs->file, 0, size, s->header, 0); | |
729 | } | |
730 | ||
731 | static int parallels_open(BlockDriverState *bs, QDict *options, int flags, | |
732 | Error **errp) | |
733 | { | |
734 | BDRVParallelsState *s = bs->opaque; | |
735 | ParallelsHeader ph; | |
736 | int ret, size, i; | |
737 | QemuOpts *opts = NULL; | |
738 | Error *local_err = NULL; | |
739 | char *buf; | |
740 | ||
741 | ret = bdrv_open_file_child(NULL, options, "file", bs, errp); | |
742 | if (ret < 0) { | |
743 | return ret; | |
744 | } | |
745 | ||
746 | ret = bdrv_pread(bs->file, 0, sizeof(ph), &ph, 0); | |
747 | if (ret < 0) { | |
748 | goto fail; | |
749 | } | |
750 | ||
751 | bs->total_sectors = le64_to_cpu(ph.nb_sectors); | |
752 | ||
753 | if (le32_to_cpu(ph.version) != HEADER_VERSION) { | |
754 | goto fail_format; | |
755 | } | |
756 | if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { | |
757 | s->off_multiplier = 1; | |
758 | bs->total_sectors = 0xffffffff & bs->total_sectors; | |
759 | } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { | |
760 | s->off_multiplier = le32_to_cpu(ph.tracks); | |
761 | } else { | |
762 | goto fail_format; | |
763 | } | |
764 | ||
765 | s->tracks = le32_to_cpu(ph.tracks); | |
766 | if (s->tracks == 0) { | |
767 | error_setg(errp, "Invalid image: Zero sectors per track"); | |
768 | ret = -EINVAL; | |
769 | goto fail; | |
770 | } | |
771 | if (s->tracks > INT32_MAX/513) { | |
772 | error_setg(errp, "Invalid image: Too big cluster"); | |
773 | ret = -EFBIG; | |
774 | goto fail; | |
775 | } | |
776 | s->cluster_size = s->tracks << BDRV_SECTOR_BITS; | |
777 | ||
778 | s->bat_size = le32_to_cpu(ph.bat_entries); | |
779 | if (s->bat_size > INT_MAX / sizeof(uint32_t)) { | |
780 | error_setg(errp, "Catalog too large"); | |
781 | ret = -EFBIG; | |
782 | goto fail; | |
783 | } | |
784 | ||
785 | size = bat_entry_off(s->bat_size); | |
786 | s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); | |
787 | s->header = qemu_try_blockalign(bs->file->bs, s->header_size); | |
788 | if (s->header == NULL) { | |
789 | ret = -ENOMEM; | |
790 | goto fail; | |
791 | } | |
792 | s->data_end = le32_to_cpu(ph.data_off); | |
793 | if (s->data_end == 0) { | |
794 | s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); | |
795 | } | |
796 | if (s->data_end < s->header_size) { | |
797 | /* there is not enough unused space to fit to block align between BAT | |
798 | and actual data. We can't avoid read-modify-write... */ | |
799 | s->header_size = size; | |
800 | } | |
801 | ||
802 | ret = bdrv_pread(bs->file, 0, s->header_size, s->header, 0); | |
803 | if (ret < 0) { | |
804 | goto fail; | |
805 | } | |
806 | s->bat_bitmap = (uint32_t *)(s->header + 1); | |
807 | ||
808 | for (i = 0; i < s->bat_size; i++) { | |
809 | int64_t off = bat2sect(s, i); | |
810 | if (off >= s->data_end) { | |
811 | s->data_end = off + s->tracks; | |
812 | } | |
813 | } | |
814 | ||
815 | if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { | |
816 | /* Image was not closed correctly. The check is mandatory */ | |
817 | s->header_unclean = true; | |
818 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { | |
819 | error_setg(errp, "parallels: Image was not closed correctly; " | |
820 | "cannot be opened read/write"); | |
821 | ret = -EACCES; | |
822 | goto fail; | |
823 | } | |
824 | } | |
825 | ||
826 | opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, errp); | |
827 | if (!opts) { | |
828 | goto fail_options; | |
829 | } | |
830 | ||
831 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { | |
832 | goto fail_options; | |
833 | } | |
834 | ||
835 | s->prealloc_size = | |
836 | qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); | |
837 | s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); | |
838 | buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); | |
839 | /* prealloc_mode can be downgraded later during allocate_clusters */ | |
840 | s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, | |
841 | PRL_PREALLOC_MODE_FALLOCATE, | |
842 | &local_err); | |
843 | g_free(buf); | |
844 | if (local_err != NULL) { | |
845 | error_propagate(errp, local_err); | |
846 | goto fail_options; | |
847 | } | |
848 | ||
849 | if (ph.ext_off) { | |
850 | if (flags & BDRV_O_RDWR) { | |
851 | /* | |
852 | * It's unsafe to open image RW if there is an extension (as we | |
853 | * don't support it). But parallels driver in QEMU historically | |
854 | * ignores the extension, so print warning and don't care. | |
855 | */ | |
856 | warn_report("Format Extension ignored in RW mode"); | |
857 | } else { | |
858 | ret = parallels_read_format_extension( | |
859 | bs, le64_to_cpu(ph.ext_off) << BDRV_SECTOR_BITS, errp); | |
860 | if (ret < 0) { | |
861 | goto fail; | |
862 | } | |
863 | } | |
864 | } | |
865 | ||
866 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { | |
867 | s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); | |
868 | ret = parallels_update_header(bs); | |
869 | if (ret < 0) { | |
870 | goto fail; | |
871 | } | |
872 | } | |
873 | ||
874 | s->bat_dirty_block = 4 * qemu_real_host_page_size(); | |
875 | s->bat_dirty_bmap = | |
876 | bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); | |
877 | ||
878 | /* Disable migration until bdrv_activate method is added */ | |
879 | error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " | |
880 | "does not support live migration", | |
881 | bdrv_get_device_or_node_name(bs)); | |
882 | ret = migrate_add_blocker(s->migration_blocker, errp); | |
883 | if (ret < 0) { | |
884 | error_free(s->migration_blocker); | |
885 | goto fail; | |
886 | } | |
887 | qemu_co_mutex_init(&s->lock); | |
888 | return 0; | |
889 | ||
890 | fail_format: | |
891 | error_setg(errp, "Image not in Parallels format"); | |
892 | fail_options: | |
893 | ret = -EINVAL; | |
894 | fail: | |
895 | qemu_vfree(s->header); | |
896 | return ret; | |
897 | } | |
898 | ||
899 | ||
900 | static void parallels_close(BlockDriverState *bs) | |
901 | { | |
902 | BDRVParallelsState *s = bs->opaque; | |
903 | ||
904 | if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { | |
905 | s->header->inuse = 0; | |
906 | parallels_update_header(bs); | |
907 | ||
908 | /* errors are ignored, so we might as well pass exact=true */ | |
909 | bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, true, | |
910 | PREALLOC_MODE_OFF, 0, NULL); | |
911 | } | |
912 | ||
913 | g_free(s->bat_dirty_bmap); | |
914 | qemu_vfree(s->header); | |
915 | ||
916 | migrate_del_blocker(s->migration_blocker); | |
917 | error_free(s->migration_blocker); | |
918 | } | |
919 | ||
920 | static BlockDriver bdrv_parallels = { | |
921 | .format_name = "parallels", | |
922 | .instance_size = sizeof(BDRVParallelsState), | |
923 | .bdrv_probe = parallels_probe, | |
924 | .bdrv_open = parallels_open, | |
925 | .bdrv_close = parallels_close, | |
926 | .bdrv_child_perm = bdrv_default_perms, | |
927 | .bdrv_co_block_status = parallels_co_block_status, | |
928 | .bdrv_has_zero_init = bdrv_has_zero_init_1, | |
929 | .bdrv_co_flush_to_os = parallels_co_flush_to_os, | |
930 | .bdrv_co_readv = parallels_co_readv, | |
931 | .bdrv_co_writev = parallels_co_writev, | |
932 | .is_format = true, | |
933 | .supports_backing = true, | |
934 | .bdrv_co_create = parallels_co_create, | |
935 | .bdrv_co_create_opts = parallels_co_create_opts, | |
936 | .bdrv_co_check = parallels_co_check, | |
937 | .create_opts = ¶llels_create_opts, | |
938 | }; | |
939 | ||
940 | static void bdrv_parallels_init(void) | |
941 | { | |
942 | bdrv_register(&bdrv_parallels); | |
943 | } | |
944 | ||
945 | block_init(bdrv_parallels_init); |