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Commit | Line | Data |
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6ada7453 TS |
1 | /* |
2 | * Block driver for Parallels disk image format | |
3 | * | |
4 | * Copyright (c) 2007 Alex Beregszaszi | |
cc5690f2 | 5 | * Copyright (c) 2015 Denis V. Lunev <den@openvz.org> |
6ada7453 | 6 | * |
cc5690f2 DL |
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 | |
6ada7453 TS |
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 | */ | |
922a01a0 | 30 | |
80c71a24 | 31 | #include "qemu/osdep.h" |
da34e65c | 32 | #include "qapi/error.h" |
737e150e | 33 | #include "block/block_int.h" |
8942764f | 34 | #include "sysemu/block-backend.h" |
1de7afc9 | 35 | #include "qemu/module.h" |
922a01a0 | 36 | #include "qemu/option.h" |
1511b490 KW |
37 | #include "qapi/qmp/qdict.h" |
38 | #include "qapi/qobject-input-visitor.h" | |
39 | #include "qapi/qapi-visit-block-core.h" | |
58369e22 | 40 | #include "qemu/bswap.h" |
0d31c7c2 | 41 | #include "qemu/bitmap.h" |
1d0f37cf | 42 | #include "migration/blocker.h" |
90fe66f0 | 43 | #include "parallels.h" |
6ada7453 TS |
44 | |
45 | /**************************************************************/ | |
46 | ||
47 | #define HEADER_MAGIC "WithoutFreeSpace" | |
d25d5980 | 48 | #define HEADER_MAGIC2 "WithouFreSpacExt" |
6ada7453 | 49 | #define HEADER_VERSION 2 |
6dd6b9f1 | 50 | #define HEADER_INUSE_MAGIC (0x746F6E59) |
555a608c | 51 | #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32) |
6ada7453 | 52 | |
f7abe0ec MAL |
53 | static QEnumLookup prealloc_mode_lookup = { |
54 | .array = (const char *const[]) { | |
55 | "falloc", | |
56 | "truncate", | |
f7abe0ec MAL |
57 | }, |
58 | .size = PRL_PREALLOC_MODE__MAX | |
d6179011 DL |
59 | }; |
60 | ||
d6179011 DL |
61 | #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" |
62 | #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" | |
63 | ||
64 | static 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", | |
ff5bbe56 | 72 | .def_value_str = "128M", |
d6179011 DL |
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 | { /* end of list */ }, | |
82 | }, | |
83 | }; | |
84 | ||
1511b490 KW |
85 | static 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 | { /* end of list */ } | |
101 | } | |
102 | }; | |
103 | ||
d6179011 | 104 | |
555cc9d9 DL |
105 | static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) |
106 | { | |
dd97cdc0 | 107 | return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; |
555cc9d9 DL |
108 | } |
109 | ||
2d68e22e DL |
110 | static uint32_t bat_entry_off(uint32_t idx) |
111 | { | |
112 | return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; | |
113 | } | |
114 | ||
29442569 | 115 | static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) |
6ada7453 | 116 | { |
c34d2451 | 117 | uint32_t index, offset; |
6ada7453 TS |
118 | |
119 | index = sector_num / s->tracks; | |
120 | offset = sector_num % s->tracks; | |
121 | ||
9d8b88f6 | 122 | /* not allocated */ |
369f7de9 | 123 | if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { |
f08e2f84 | 124 | return -1; |
369f7de9 | 125 | } |
555cc9d9 | 126 | return bat2sect(s, index) + offset; |
6ada7453 TS |
127 | } |
128 | ||
9de9da17 RK |
129 | static 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 | ||
6953d920 DL |
136 | static 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 | ||
ddd2ef2c DL |
165 | static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num, |
166 | int nb_sectors, int *pnum) | |
5a41e1fa | 167 | { |
bcbb3866 | 168 | int ret; |
5a41e1fa | 169 | BDRVParallelsState *s = bs->opaque; |
d8b83e37 | 170 | int64_t pos, space, idx, to_allocate, i, len; |
5a41e1fa | 171 | |
ddd2ef2c DL |
172 | pos = block_status(s, sector_num, nb_sectors, pnum); |
173 | if (pos > 0) { | |
174 | return pos; | |
175 | } | |
5a41e1fa | 176 | |
ddd2ef2c | 177 | idx = sector_num / s->tracks; |
969401fe | 178 | to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; |
86d1bd70 HR |
179 | |
180 | /* This function is called only by parallels_co_writev(), which will never | |
181 | * pass a sector_num at or beyond the end of the image (because the block | |
182 | * layer never passes such a sector_num to that function). Therefore, idx | |
183 | * is always below s->bat_size. | |
184 | * block_status() will limit *pnum so that sector_num + *pnum will not | |
185 | * exceed the image end. Therefore, idx + to_allocate cannot exceed | |
186 | * s->bat_size. | |
187 | * Note that s->bat_size is an unsigned int, therefore idx + to_allocate | |
188 | * will always fit into a uint32_t. */ | |
189 | assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); | |
190 | ||
ddd2ef2c | 191 | space = to_allocate * s->tracks; |
d8b83e37 DL |
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)) { | |
ddd2ef2c | 197 | space += s->prealloc_size; |
19f5dc15 | 198 | if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { |
720ff280 | 199 | ret = bdrv_pwrite_zeroes(bs->file, |
74021bc4 EB |
200 | s->data_end << BDRV_SECTOR_BITS, |
201 | space << BDRV_SECTOR_BITS, 0); | |
19f5dc15 | 202 | } else { |
52cdbc58 | 203 | ret = bdrv_truncate(bs->file, |
ed3d2ec9 | 204 | (s->data_end + space) << BDRV_SECTOR_BITS, |
7ea37c30 | 205 | PREALLOC_MODE_OFF, NULL); |
19f5dc15 DL |
206 | } |
207 | if (ret < 0) { | |
208 | return ret; | |
209 | } | |
5a41e1fa DL |
210 | } |
211 | ||
bcbb3866 EK |
212 | /* Try to read from backing to fill empty clusters |
213 | * FIXME: 1. previous write_zeroes may be redundant | |
214 | * 2. most of data we read from backing will be rewritten by | |
215 | * parallels_co_writev. On aligned-to-cluster write we do not need | |
216 | * this read at all. | |
217 | * 3. it would be good to combine write of data from backing and new | |
218 | * data into one write call */ | |
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 | ||
ddd2ef2c DL |
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, | |
c9f6856d | 247 | bat_entry_off(idx + i) / s->bat_dirty_block, 1); |
ddd2ef2c | 248 | } |
0d31c7c2 | 249 | |
ddd2ef2c | 250 | return bat2sect(s, idx) + sector_num % s->tracks; |
5a41e1fa DL |
251 | } |
252 | ||
0d31c7c2 DL |
253 | |
254 | static 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 | } | |
d9ca2ea2 | 271 | ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, |
9a4f4c31 | 272 | to_write); |
0d31c7c2 DL |
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 | ||
8e0cf59d EB |
286 | static 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) | |
dd3bed16 RK |
293 | { |
294 | BDRVParallelsState *s = bs->opaque; | |
8e0cf59d | 295 | int count; |
dd3bed16 | 296 | |
8e0cf59d | 297 | assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE)); |
dd3bed16 | 298 | qemu_co_mutex_lock(&s->lock); |
8e0cf59d EB |
299 | offset = block_status(s, offset >> BDRV_SECTOR_BITS, |
300 | bytes >> BDRV_SECTOR_BITS, &count); | |
dd3bed16 RK |
301 | qemu_co_mutex_unlock(&s->lock); |
302 | ||
8e0cf59d | 303 | *pnum = count * BDRV_SECTOR_SIZE; |
dd3bed16 RK |
304 | if (offset < 0) { |
305 | return 0; | |
306 | } | |
307 | ||
8e0cf59d | 308 | *map = offset * BDRV_SECTOR_SIZE; |
ddf4987d | 309 | *file = bs->file->bs; |
8e0cf59d | 310 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
dd3bed16 RK |
311 | } |
312 | ||
5a41e1fa DL |
313 | static 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); | |
ddd2ef2c | 328 | position = allocate_clusters(bs, sector_num, nb_sectors, &n); |
5a41e1fa DL |
329 | qemu_co_mutex_unlock(&s->lock); |
330 | if (position < 0) { | |
331 | ret = (int)position; | |
332 | break; | |
333 | } | |
334 | ||
5a41e1fa DL |
335 | nbytes = n << BDRV_SECTOR_BITS; |
336 | ||
337 | qemu_iovec_reset(&hd_qiov); | |
338 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); | |
339 | ||
25ec177d | 340 | ret = bdrv_co_writev(bs->file, position, n, &hd_qiov); |
5a41e1fa DL |
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 | ||
481fb9cf DL |
354 | static coroutine_fn int parallels_co_readv(BlockDriverState *bs, |
355 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
6ada7453 | 356 | { |
29442569 | 357 | BDRVParallelsState *s = bs->opaque; |
481fb9cf DL |
358 | uint64_t bytes_done = 0; |
359 | QEMUIOVector hd_qiov; | |
360 | int ret = 0; | |
361 | ||
362 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
29442569 | 363 | |
6ada7453 | 364 | while (nb_sectors > 0) { |
481fb9cf DL |
365 | int64_t position; |
366 | int n, nbytes; | |
367 | ||
368 | qemu_co_mutex_lock(&s->lock); | |
6953d920 | 369 | position = block_status(s, sector_num, nb_sectors, &n); |
481fb9cf DL |
370 | qemu_co_mutex_unlock(&s->lock); |
371 | ||
481fb9cf DL |
372 | nbytes = n << BDRV_SECTOR_BITS; |
373 | ||
bcbb3866 EK |
374 | qemu_iovec_reset(&hd_qiov); |
375 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); | |
376 | ||
481fb9cf | 377 | if (position < 0) { |
bcbb3866 EK |
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 | } | |
481fb9cf | 386 | } else { |
28b04a8f | 387 | ret = bdrv_co_readv(bs->file, position, n, &hd_qiov); |
29442569 | 388 | if (ret < 0) { |
481fb9cf | 389 | break; |
29442569 | 390 | } |
9d8b88f6 | 391 | } |
481fb9cf | 392 | |
9de9da17 RK |
393 | nb_sectors -= n; |
394 | sector_num += n; | |
481fb9cf | 395 | bytes_done += nbytes; |
6ada7453 | 396 | } |
6ada7453 | 397 | |
481fb9cf | 398 | qemu_iovec_destroy(&hd_qiov); |
2914caa0 PB |
399 | return ret; |
400 | } | |
401 | ||
49ad6467 | 402 | |
2fd61638 PB |
403 | static int coroutine_fn parallels_co_check(BlockDriverState *bs, |
404 | BdrvCheckResult *res, | |
405 | BdrvCheckMode fix) | |
49ad6467 DL |
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 | ||
9a4f4c31 | 414 | size = bdrv_getlength(bs->file->bs); |
49ad6467 DL |
415 | if (size < 0) { |
416 | res->check_errors++; | |
417 | return size; | |
418 | } | |
419 | ||
2fd61638 | 420 | qemu_co_mutex_lock(&s->lock); |
6dd6b9f1 DL |
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 | /* parallels_close will do the job right */ | |
427 | res->corruptions_fixed++; | |
428 | s->header_unclean = false; | |
429 | } | |
430 | } | |
431 | ||
49ad6467 DL |
432 | res->bfi.total_clusters = s->bat_size; |
433 | res->bfi.compressed_clusters = 0; /* compression is not supported */ | |
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 | /* cluster outside the image */ | |
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 | ||
2fd61638 | 469 | ret = 0; |
49ad6467 | 470 | if (flush_bat) { |
d9ca2ea2 | 471 | ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); |
49ad6467 DL |
472 | if (ret < 0) { |
473 | res->check_errors++; | |
2fd61638 | 474 | goto out; |
49ad6467 DL |
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) { | |
ed3d2ec9 | 487 | Error *local_err = NULL; |
7ea37c30 HR |
488 | ret = bdrv_truncate(bs->file, res->image_end_offset, |
489 | PREALLOC_MODE_OFF, &local_err); | |
49ad6467 | 490 | if (ret < 0) { |
ed3d2ec9 | 491 | error_report_err(local_err); |
49ad6467 | 492 | res->check_errors++; |
2fd61638 | 493 | goto out; |
49ad6467 DL |
494 | } |
495 | res->leaks_fixed += count; | |
496 | } | |
497 | } | |
498 | ||
2fd61638 PB |
499 | out: |
500 | qemu_co_mutex_unlock(&s->lock); | |
501 | return ret; | |
49ad6467 DL |
502 | } |
503 | ||
504 | ||
1511b490 KW |
505 | static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts, |
506 | Error **errp) | |
74cf6c50 | 507 | { |
1511b490 KW |
508 | BlockdevCreateOptionsParallels *parallels_opts; |
509 | BlockDriverState *bs; | |
510 | BlockBackend *blk; | |
74cf6c50 | 511 | int64_t total_size, cl_size; |
369f7de9 | 512 | uint32_t bat_entries, bat_sectors; |
74cf6c50 | 513 | ParallelsHeader header; |
1511b490 | 514 | uint8_t tmp[BDRV_SECTOR_SIZE]; |
74cf6c50 DL |
515 | int ret; |
516 | ||
1511b490 KW |
517 | assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS); |
518 | parallels_opts = &opts->u.parallels; | |
519 | ||
520 | /* Sanity checks */ | |
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 | ||
2332d825 KW |
529 | /* XXX What is the real limit here? This is an insanely large maximum. */ |
530 | if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) { | |
531 | error_setg(errp, "Cluster size is too large"); | |
532 | return -EINVAL; | |
533 | } | |
555a608c | 534 | if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { |
1511b490 | 535 | error_setg(errp, "Image size is too large for this cluster size"); |
555a608c KK |
536 | return -E2BIG; |
537 | } | |
74cf6c50 | 538 | |
1511b490 KW |
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; | |
74cf6c50 DL |
542 | } |
543 | ||
1511b490 KW |
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 | /* Create BlockBackend to write to the image */ | |
550 | bs = bdrv_open_blockdev_ref(parallels_opts->file, errp); | |
551 | if (bs == NULL) { | |
8942764f | 552 | return -EIO; |
74cf6c50 | 553 | } |
8942764f | 554 | |
1511b490 KW |
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); | |
8942764f | 561 | |
1511b490 KW |
562 | /* Create image format */ |
563 | ret = blk_truncate(blk, 0, PREALLOC_MODE_OFF, errp); | |
74cf6c50 | 564 | if (ret < 0) { |
1511b490 | 565 | goto out; |
74cf6c50 DL |
566 | } |
567 | ||
369f7de9 | 568 | bat_entries = DIV_ROUND_UP(total_size, cl_size); |
2d68e22e | 569 | bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); |
369f7de9 | 570 | bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; |
74cf6c50 DL |
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 | /* don't care much about geometry, it is not used on image level */ | |
908b1c84 KK |
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); | |
74cf6c50 | 579 | header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); |
369f7de9 | 580 | header.bat_entries = cpu_to_le32(bat_entries); |
74cf6c50 | 581 | header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); |
369f7de9 | 582 | header.data_off = cpu_to_le32(bat_sectors); |
74cf6c50 DL |
583 | |
584 | /* write all the data */ | |
585 | memset(tmp, 0, sizeof(tmp)); | |
586 | memcpy(tmp, &header, sizeof(header)); | |
587 | ||
1511b490 | 588 | ret = blk_pwrite(blk, 0, tmp, BDRV_SECTOR_SIZE, 0); |
74cf6c50 DL |
589 | if (ret < 0) { |
590 | goto exit; | |
591 | } | |
1511b490 | 592 | ret = blk_pwrite_zeroes(blk, BDRV_SECTOR_SIZE, |
d004bd52 | 593 | (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); |
74cf6c50 DL |
594 | if (ret < 0) { |
595 | goto exit; | |
596 | } | |
74cf6c50 | 597 | |
1511b490 KW |
598 | ret = 0; |
599 | out: | |
600 | blk_unref(blk); | |
601 | bdrv_unref(bs); | |
74cf6c50 DL |
602 | return ret; |
603 | ||
604 | exit: | |
605 | error_setg_errno(errp, -ret, "Failed to create Parallels image"); | |
1511b490 KW |
606 | goto out; |
607 | } | |
608 | ||
609 | static 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 | /* Parse options and convert legacy syntax */ | |
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 | /* Create and open the file (protocol layer) */ | |
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 | /* Now get the QAPI type BlockdevCreateOptions */ | |
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); | |
7dc847eb | 655 | qdict = qobject_to(QDict, qobj); |
1511b490 KW |
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 | /* Silently round up sizes */ | |
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 | /* Create the Parallels image (format layer) */ | |
678 | ret = parallels_co_create(create_options, errp); | |
679 | if (ret < 0) { | |
680 | goto done; | |
681 | } | |
682 | ret = 0; | |
683 | ||
684 | done: | |
685 | QDECREF(qdict); | |
686 | bdrv_unref(bs); | |
687 | qapi_free_BlockdevCreateOptions(create_options); | |
688 | return ret; | |
74cf6c50 DL |
689 | } |
690 | ||
23d6bd3b DL |
691 | |
692 | static 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 | ||
6dd6b9f1 DL |
710 | static int parallels_update_header(BlockDriverState *bs) |
711 | { | |
712 | BDRVParallelsState *s = bs->opaque; | |
9a4f4c31 KW |
713 | unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), |
714 | sizeof(ParallelsHeader)); | |
6dd6b9f1 DL |
715 | |
716 | if (size > s->header_size) { | |
717 | size = s->header_size; | |
718 | } | |
d9ca2ea2 | 719 | return bdrv_pwrite_sync(bs->file, 0, s->header, size); |
6dd6b9f1 DL |
720 | } |
721 | ||
23d6bd3b DL |
722 | static int parallels_open(BlockDriverState *bs, QDict *options, int flags, |
723 | Error **errp) | |
724 | { | |
725 | BDRVParallelsState *s = bs->opaque; | |
726 | ParallelsHeader ph; | |
19f5dc15 | 727 | int ret, size, i; |
d6179011 DL |
728 | QemuOpts *opts = NULL; |
729 | Error *local_err = NULL; | |
730 | char *buf; | |
23d6bd3b | 731 | |
4e4bf5c4 KW |
732 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
733 | false, errp); | |
734 | if (!bs->file) { | |
735 | return -EINVAL; | |
736 | } | |
737 | ||
cf2ab8fc | 738 | ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); |
23d6bd3b DL |
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 | ||
2d68e22e | 776 | size = bat_entry_off(s->bat_size); |
9a4f4c31 KW |
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); | |
23d6bd3b DL |
779 | if (s->header == NULL) { |
780 | ret = -ENOMEM; | |
781 | goto fail; | |
782 | } | |
19f5dc15 DL |
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) { | |
23d6bd3b DL |
788 | /* there is not enough unused space to fit to block align between BAT |
789 | and actual data. We can't avoid read-modify-write... */ | |
790 | s->header_size = size; | |
791 | } | |
792 | ||
cf2ab8fc | 793 | ret = bdrv_pread(bs->file, 0, s->header, s->header_size); |
23d6bd3b DL |
794 | if (ret < 0) { |
795 | goto fail; | |
796 | } | |
797 | s->bat_bitmap = (uint32_t *)(s->header + 1); | |
798 | ||
19f5dc15 DL |
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 | ||
6dd6b9f1 DL |
806 | if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { |
807 | /* Image was not closed correctly. The check is mandatory */ | |
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 | ||
d6179011 DL |
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); | |
f7abe0ec | 831 | s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, |
06c60b6c MA |
832 | PRL_PREALLOC_MODE_FALLOCATE, |
833 | &local_err); | |
d6179011 DL |
834 | g_free(buf); |
835 | if (local_err != NULL) { | |
836 | goto fail_options; | |
837 | } | |
dc62da88 | 838 | |
e5e62683 | 839 | if (!bdrv_has_zero_init(bs->file->bs)) { |
d6179011 DL |
840 | s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; |
841 | } | |
842 | ||
6c7d390b | 843 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { |
6dd6b9f1 DL |
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 | ||
0d31c7c2 DL |
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 | ||
1d0f37cf JC |
855 | /* Disable migration until bdrv_invalidate_cache method is added */ |
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 | } | |
23d6bd3b DL |
865 | qemu_co_mutex_init(&s->lock); |
866 | return 0; | |
867 | ||
868 | fail_format: | |
869 | error_setg(errp, "Image not in Parallels format"); | |
870 | ret = -EINVAL; | |
871 | fail: | |
872 | qemu_vfree(s->header); | |
873 | return ret; | |
d6179011 DL |
874 | |
875 | fail_options: | |
876 | error_propagate(errp, local_err); | |
877 | ret = -EINVAL; | |
878 | goto fail; | |
23d6bd3b DL |
879 | } |
880 | ||
881 | ||
6ada7453 TS |
882 | static void parallels_close(BlockDriverState *bs) |
883 | { | |
884 | BDRVParallelsState *s = bs->opaque; | |
6dd6b9f1 | 885 | |
6c7d390b | 886 | if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { |
6dd6b9f1 DL |
887 | s->header->inuse = 0; |
888 | parallels_update_header(bs); | |
7ea37c30 HR |
889 | bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, |
890 | PREALLOC_MODE_OFF, NULL); | |
19f5dc15 DL |
891 | } |
892 | ||
0d31c7c2 | 893 | g_free(s->bat_dirty_bmap); |
9eae9cca | 894 | qemu_vfree(s->header); |
1d0f37cf JC |
895 | |
896 | migrate_del_blocker(s->migration_blocker); | |
897 | error_free(s->migration_blocker); | |
6ada7453 TS |
898 | } |
899 | ||
5efa9d5a | 900 | static BlockDriver bdrv_parallels = { |
e60f469c AJ |
901 | .format_name = "parallels", |
902 | .instance_size = sizeof(BDRVParallelsState), | |
903 | .bdrv_probe = parallels_probe, | |
1dec5a70 | 904 | .bdrv_open = parallels_open, |
e60f469c | 905 | .bdrv_close = parallels_close, |
862f215f | 906 | .bdrv_child_perm = bdrv_format_default_perms, |
8e0cf59d | 907 | .bdrv_co_block_status = parallels_co_block_status, |
d0e61ce5 | 908 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
0d31c7c2 | 909 | .bdrv_co_flush_to_os = parallels_co_flush_to_os, |
481fb9cf | 910 | .bdrv_co_readv = parallels_co_readv, |
5a41e1fa | 911 | .bdrv_co_writev = parallels_co_writev, |
bcbb3866 | 912 | .supports_backing = true, |
1511b490 | 913 | .bdrv_co_create = parallels_co_create, |
efc75e2a | 914 | .bdrv_co_create_opts = parallels_co_create_opts, |
2fd61638 | 915 | .bdrv_co_check = parallels_co_check, |
74cf6c50 | 916 | .create_opts = ¶llels_create_opts, |
6ada7453 | 917 | }; |
5efa9d5a AL |
918 | |
919 | static void bdrv_parallels_init(void) | |
920 | { | |
921 | bdrv_register(&bdrv_parallels); | |
922 | } | |
923 | ||
924 | block_init(bdrv_parallels_init); |