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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" |
baefd977 | 32 | #include "qemu/error-report.h" |
da34e65c | 33 | #include "qapi/error.h" |
737e150e | 34 | #include "block/block_int.h" |
609f45ea | 35 | #include "block/qdict.h" |
8942764f | 36 | #include "sysemu/block-backend.h" |
1de7afc9 | 37 | #include "qemu/module.h" |
922a01a0 | 38 | #include "qemu/option.h" |
1511b490 KW |
39 | #include "qapi/qmp/qdict.h" |
40 | #include "qapi/qobject-input-visitor.h" | |
41 | #include "qapi/qapi-visit-block-core.h" | |
58369e22 | 42 | #include "qemu/bswap.h" |
0d31c7c2 | 43 | #include "qemu/bitmap.h" |
1d0f37cf | 44 | #include "migration/blocker.h" |
90fe66f0 | 45 | #include "parallels.h" |
6ada7453 TS |
46 | |
47 | /**************************************************************/ | |
48 | ||
49 | #define HEADER_MAGIC "WithoutFreeSpace" | |
d25d5980 | 50 | #define HEADER_MAGIC2 "WithouFreSpacExt" |
6ada7453 | 51 | #define HEADER_VERSION 2 |
6dd6b9f1 | 52 | #define HEADER_INUSE_MAGIC (0x746F6E59) |
555a608c | 53 | #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32) |
6ada7453 | 54 | |
f7abe0ec MAL |
55 | static QEnumLookup prealloc_mode_lookup = { |
56 | .array = (const char *const[]) { | |
57 | "falloc", | |
58 | "truncate", | |
f7abe0ec MAL |
59 | }, |
60 | .size = PRL_PREALLOC_MODE__MAX | |
d6179011 DL |
61 | }; |
62 | ||
d6179011 DL |
63 | #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" |
64 | #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" | |
65 | ||
66 | static QemuOptsList parallels_runtime_opts = { | |
67 | .name = "parallels", | |
68 | .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head), | |
69 | .desc = { | |
70 | { | |
71 | .name = PARALLELS_OPT_PREALLOC_SIZE, | |
72 | .type = QEMU_OPT_SIZE, | |
73 | .help = "Preallocation size on image expansion", | |
ff5bbe56 | 74 | .def_value_str = "128M", |
d6179011 DL |
75 | }, |
76 | { | |
77 | .name = PARALLELS_OPT_PREALLOC_MODE, | |
78 | .type = QEMU_OPT_STRING, | |
79 | .help = "Preallocation mode on image expansion " | |
80 | "(allowed values: falloc, truncate)", | |
81 | .def_value_str = "falloc", | |
82 | }, | |
83 | { /* end of list */ }, | |
84 | }, | |
85 | }; | |
86 | ||
1511b490 KW |
87 | static QemuOptsList parallels_create_opts = { |
88 | .name = "parallels-create-opts", | |
89 | .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), | |
90 | .desc = { | |
91 | { | |
92 | .name = BLOCK_OPT_SIZE, | |
93 | .type = QEMU_OPT_SIZE, | |
94 | .help = "Virtual disk size", | |
95 | }, | |
96 | { | |
97 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
98 | .type = QEMU_OPT_SIZE, | |
99 | .help = "Parallels image cluster size", | |
100 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), | |
101 | }, | |
102 | { /* end of list */ } | |
103 | } | |
104 | }; | |
105 | ||
d6179011 | 106 | |
555cc9d9 DL |
107 | static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) |
108 | { | |
dd97cdc0 | 109 | return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; |
555cc9d9 DL |
110 | } |
111 | ||
2d68e22e DL |
112 | static uint32_t bat_entry_off(uint32_t idx) |
113 | { | |
114 | return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; | |
115 | } | |
116 | ||
29442569 | 117 | static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) |
6ada7453 | 118 | { |
c34d2451 | 119 | uint32_t index, offset; |
6ada7453 TS |
120 | |
121 | index = sector_num / s->tracks; | |
122 | offset = sector_num % s->tracks; | |
123 | ||
9d8b88f6 | 124 | /* not allocated */ |
369f7de9 | 125 | if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { |
f08e2f84 | 126 | return -1; |
369f7de9 | 127 | } |
555cc9d9 | 128 | return bat2sect(s, index) + offset; |
6ada7453 TS |
129 | } |
130 | ||
9de9da17 RK |
131 | static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num, |
132 | int nb_sectors) | |
133 | { | |
134 | int ret = s->tracks - sector_num % s->tracks; | |
135 | return MIN(nb_sectors, ret); | |
136 | } | |
137 | ||
6953d920 DL |
138 | static int64_t block_status(BDRVParallelsState *s, int64_t sector_num, |
139 | int nb_sectors, int *pnum) | |
140 | { | |
141 | int64_t start_off = -2, prev_end_off = -2; | |
142 | ||
143 | *pnum = 0; | |
144 | while (nb_sectors > 0 || start_off == -2) { | |
145 | int64_t offset = seek_to_sector(s, sector_num); | |
146 | int to_end; | |
147 | ||
148 | if (start_off == -2) { | |
149 | start_off = offset; | |
150 | prev_end_off = offset; | |
151 | } else if (offset != prev_end_off) { | |
152 | break; | |
153 | } | |
154 | ||
155 | to_end = cluster_remainder(s, sector_num, nb_sectors); | |
156 | nb_sectors -= to_end; | |
157 | sector_num += to_end; | |
158 | *pnum += to_end; | |
159 | ||
160 | if (offset > 0) { | |
161 | prev_end_off += to_end; | |
162 | } | |
163 | } | |
164 | return start_off; | |
165 | } | |
166 | ||
ddd2ef2c DL |
167 | static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num, |
168 | int nb_sectors, int *pnum) | |
5a41e1fa | 169 | { |
bda4cdcb | 170 | int ret = 0; |
5a41e1fa | 171 | BDRVParallelsState *s = bs->opaque; |
d8b83e37 | 172 | int64_t pos, space, idx, to_allocate, i, len; |
5a41e1fa | 173 | |
ddd2ef2c DL |
174 | pos = block_status(s, sector_num, nb_sectors, pnum); |
175 | if (pos > 0) { | |
176 | return pos; | |
177 | } | |
5a41e1fa | 178 | |
ddd2ef2c | 179 | idx = sector_num / s->tracks; |
969401fe | 180 | to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; |
86d1bd70 HR |
181 | |
182 | /* This function is called only by parallels_co_writev(), which will never | |
183 | * pass a sector_num at or beyond the end of the image (because the block | |
184 | * layer never passes such a sector_num to that function). Therefore, idx | |
185 | * is always below s->bat_size. | |
186 | * block_status() will limit *pnum so that sector_num + *pnum will not | |
187 | * exceed the image end. Therefore, idx + to_allocate cannot exceed | |
188 | * s->bat_size. | |
189 | * Note that s->bat_size is an unsigned int, therefore idx + to_allocate | |
190 | * will always fit into a uint32_t. */ | |
191 | assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); | |
192 | ||
ddd2ef2c | 193 | space = to_allocate * s->tracks; |
d8b83e37 DL |
194 | len = bdrv_getlength(bs->file->bs); |
195 | if (len < 0) { | |
196 | return len; | |
197 | } | |
198 | if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { | |
ddd2ef2c | 199 | space += s->prealloc_size; |
bda4cdcb EB |
200 | /* |
201 | * We require the expanded size to read back as zero. If the | |
202 | * user permitted truncation, we try that; but if it fails, we | |
203 | * force the safer-but-slower fallocate. | |
204 | */ | |
205 | if (s->prealloc_mode == PRL_PREALLOC_MODE_TRUNCATE) { | |
206 | ret = bdrv_truncate(bs->file, | |
207 | (s->data_end + space) << BDRV_SECTOR_BITS, | |
208 | false, PREALLOC_MODE_OFF, BDRV_REQ_ZERO_WRITE, | |
209 | NULL); | |
210 | if (ret == -ENOTSUP) { | |
211 | s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; | |
212 | } | |
213 | } | |
19f5dc15 | 214 | if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { |
720ff280 | 215 | ret = bdrv_pwrite_zeroes(bs->file, |
74021bc4 EB |
216 | s->data_end << BDRV_SECTOR_BITS, |
217 | space << BDRV_SECTOR_BITS, 0); | |
19f5dc15 DL |
218 | } |
219 | if (ret < 0) { | |
220 | return ret; | |
221 | } | |
5a41e1fa DL |
222 | } |
223 | ||
bcbb3866 EK |
224 | /* Try to read from backing to fill empty clusters |
225 | * FIXME: 1. previous write_zeroes may be redundant | |
226 | * 2. most of data we read from backing will be rewritten by | |
227 | * parallels_co_writev. On aligned-to-cluster write we do not need | |
228 | * this read at all. | |
229 | * 3. it would be good to combine write of data from backing and new | |
230 | * data into one write call */ | |
231 | if (bs->backing) { | |
232 | int64_t nb_cow_sectors = to_allocate * s->tracks; | |
233 | int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS; | |
a4072543 | 234 | void *buf = qemu_blockalign(bs, nb_cow_bytes); |
bcbb3866 | 235 | |
a4072543 VSO |
236 | ret = bdrv_co_pread(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE, |
237 | nb_cow_bytes, buf, 0); | |
bcbb3866 | 238 | if (ret < 0) { |
a4072543 | 239 | qemu_vfree(buf); |
bcbb3866 EK |
240 | return ret; |
241 | } | |
242 | ||
d08c2a24 | 243 | ret = bdrv_co_pwritev(bs->file, s->data_end * BDRV_SECTOR_SIZE, |
a4072543 VSO |
244 | nb_cow_bytes, buf, 0); |
245 | qemu_vfree(buf); | |
bcbb3866 EK |
246 | if (ret < 0) { |
247 | return ret; | |
248 | } | |
249 | } | |
250 | ||
ddd2ef2c DL |
251 | for (i = 0; i < to_allocate; i++) { |
252 | s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); | |
253 | s->data_end += s->tracks; | |
254 | bitmap_set(s->bat_dirty_bmap, | |
c9f6856d | 255 | bat_entry_off(idx + i) / s->bat_dirty_block, 1); |
ddd2ef2c | 256 | } |
0d31c7c2 | 257 | |
ddd2ef2c | 258 | return bat2sect(s, idx) + sector_num % s->tracks; |
5a41e1fa DL |
259 | } |
260 | ||
0d31c7c2 DL |
261 | |
262 | static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) | |
263 | { | |
264 | BDRVParallelsState *s = bs->opaque; | |
265 | unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); | |
266 | unsigned long bit; | |
267 | ||
268 | qemu_co_mutex_lock(&s->lock); | |
269 | ||
270 | bit = find_first_bit(s->bat_dirty_bmap, size); | |
271 | while (bit < size) { | |
272 | uint32_t off = bit * s->bat_dirty_block; | |
273 | uint32_t to_write = s->bat_dirty_block; | |
274 | int ret; | |
275 | ||
276 | if (off + to_write > s->header_size) { | |
277 | to_write = s->header_size - off; | |
278 | } | |
d9ca2ea2 | 279 | ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, |
9a4f4c31 | 280 | to_write); |
0d31c7c2 DL |
281 | if (ret < 0) { |
282 | qemu_co_mutex_unlock(&s->lock); | |
283 | return ret; | |
284 | } | |
285 | bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); | |
286 | } | |
287 | bitmap_zero(s->bat_dirty_bmap, size); | |
288 | ||
289 | qemu_co_mutex_unlock(&s->lock); | |
290 | return 0; | |
291 | } | |
292 | ||
293 | ||
8e0cf59d EB |
294 | static int coroutine_fn parallels_co_block_status(BlockDriverState *bs, |
295 | bool want_zero, | |
296 | int64_t offset, | |
297 | int64_t bytes, | |
298 | int64_t *pnum, | |
299 | int64_t *map, | |
300 | BlockDriverState **file) | |
dd3bed16 RK |
301 | { |
302 | BDRVParallelsState *s = bs->opaque; | |
8e0cf59d | 303 | int count; |
dd3bed16 | 304 | |
8e0cf59d | 305 | assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE)); |
dd3bed16 | 306 | qemu_co_mutex_lock(&s->lock); |
8e0cf59d EB |
307 | offset = block_status(s, offset >> BDRV_SECTOR_BITS, |
308 | bytes >> BDRV_SECTOR_BITS, &count); | |
dd3bed16 RK |
309 | qemu_co_mutex_unlock(&s->lock); |
310 | ||
8e0cf59d | 311 | *pnum = count * BDRV_SECTOR_SIZE; |
dd3bed16 RK |
312 | if (offset < 0) { |
313 | return 0; | |
314 | } | |
315 | ||
8e0cf59d | 316 | *map = offset * BDRV_SECTOR_SIZE; |
ddf4987d | 317 | *file = bs->file->bs; |
8e0cf59d | 318 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
dd3bed16 RK |
319 | } |
320 | ||
5a41e1fa | 321 | static coroutine_fn int parallels_co_writev(BlockDriverState *bs, |
e18a58b4 EB |
322 | int64_t sector_num, int nb_sectors, |
323 | QEMUIOVector *qiov, int flags) | |
5a41e1fa DL |
324 | { |
325 | BDRVParallelsState *s = bs->opaque; | |
326 | uint64_t bytes_done = 0; | |
327 | QEMUIOVector hd_qiov; | |
328 | int ret = 0; | |
329 | ||
e18a58b4 | 330 | assert(!flags); |
5a41e1fa DL |
331 | qemu_iovec_init(&hd_qiov, qiov->niov); |
332 | ||
333 | while (nb_sectors > 0) { | |
334 | int64_t position; | |
335 | int n, nbytes; | |
336 | ||
337 | qemu_co_mutex_lock(&s->lock); | |
ddd2ef2c | 338 | position = allocate_clusters(bs, sector_num, nb_sectors, &n); |
5a41e1fa DL |
339 | qemu_co_mutex_unlock(&s->lock); |
340 | if (position < 0) { | |
341 | ret = (int)position; | |
342 | break; | |
343 | } | |
344 | ||
5a41e1fa DL |
345 | nbytes = n << BDRV_SECTOR_BITS; |
346 | ||
347 | qemu_iovec_reset(&hd_qiov); | |
348 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); | |
349 | ||
d08c2a24 EB |
350 | ret = bdrv_co_pwritev(bs->file, position * BDRV_SECTOR_SIZE, nbytes, |
351 | &hd_qiov, 0); | |
5a41e1fa DL |
352 | if (ret < 0) { |
353 | break; | |
354 | } | |
355 | ||
356 | nb_sectors -= n; | |
357 | sector_num += n; | |
358 | bytes_done += nbytes; | |
359 | } | |
360 | ||
361 | qemu_iovec_destroy(&hd_qiov); | |
362 | return ret; | |
363 | } | |
364 | ||
481fb9cf DL |
365 | static coroutine_fn int parallels_co_readv(BlockDriverState *bs, |
366 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
6ada7453 | 367 | { |
29442569 | 368 | BDRVParallelsState *s = bs->opaque; |
481fb9cf DL |
369 | uint64_t bytes_done = 0; |
370 | QEMUIOVector hd_qiov; | |
371 | int ret = 0; | |
372 | ||
373 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
29442569 | 374 | |
6ada7453 | 375 | while (nb_sectors > 0) { |
481fb9cf DL |
376 | int64_t position; |
377 | int n, nbytes; | |
378 | ||
379 | qemu_co_mutex_lock(&s->lock); | |
6953d920 | 380 | position = block_status(s, sector_num, nb_sectors, &n); |
481fb9cf DL |
381 | qemu_co_mutex_unlock(&s->lock); |
382 | ||
481fb9cf DL |
383 | nbytes = n << BDRV_SECTOR_BITS; |
384 | ||
bcbb3866 EK |
385 | qemu_iovec_reset(&hd_qiov); |
386 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); | |
387 | ||
481fb9cf | 388 | if (position < 0) { |
bcbb3866 | 389 | if (bs->backing) { |
d08c2a24 EB |
390 | ret = bdrv_co_preadv(bs->backing, sector_num * BDRV_SECTOR_SIZE, |
391 | nbytes, &hd_qiov, 0); | |
bcbb3866 EK |
392 | if (ret < 0) { |
393 | break; | |
394 | } | |
395 | } else { | |
396 | qemu_iovec_memset(&hd_qiov, 0, 0, nbytes); | |
397 | } | |
481fb9cf | 398 | } else { |
d08c2a24 EB |
399 | ret = bdrv_co_preadv(bs->file, position * BDRV_SECTOR_SIZE, nbytes, |
400 | &hd_qiov, 0); | |
29442569 | 401 | if (ret < 0) { |
481fb9cf | 402 | break; |
29442569 | 403 | } |
9d8b88f6 | 404 | } |
481fb9cf | 405 | |
9de9da17 RK |
406 | nb_sectors -= n; |
407 | sector_num += n; | |
481fb9cf | 408 | bytes_done += nbytes; |
6ada7453 | 409 | } |
6ada7453 | 410 | |
481fb9cf | 411 | qemu_iovec_destroy(&hd_qiov); |
2914caa0 PB |
412 | return ret; |
413 | } | |
414 | ||
49ad6467 | 415 | |
2fd61638 PB |
416 | static int coroutine_fn parallels_co_check(BlockDriverState *bs, |
417 | BdrvCheckResult *res, | |
418 | BdrvCheckMode fix) | |
49ad6467 DL |
419 | { |
420 | BDRVParallelsState *s = bs->opaque; | |
421 | int64_t size, prev_off, high_off; | |
422 | int ret; | |
423 | uint32_t i; | |
424 | bool flush_bat = false; | |
49ad6467 | 425 | |
9a4f4c31 | 426 | size = bdrv_getlength(bs->file->bs); |
49ad6467 DL |
427 | if (size < 0) { |
428 | res->check_errors++; | |
429 | return size; | |
430 | } | |
431 | ||
2fd61638 | 432 | qemu_co_mutex_lock(&s->lock); |
6dd6b9f1 DL |
433 | if (s->header_unclean) { |
434 | fprintf(stderr, "%s image was not closed correctly\n", | |
435 | fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); | |
436 | res->corruptions++; | |
437 | if (fix & BDRV_FIX_ERRORS) { | |
438 | /* parallels_close will do the job right */ | |
439 | res->corruptions_fixed++; | |
440 | s->header_unclean = false; | |
441 | } | |
442 | } | |
443 | ||
49ad6467 DL |
444 | res->bfi.total_clusters = s->bat_size; |
445 | res->bfi.compressed_clusters = 0; /* compression is not supported */ | |
446 | ||
447 | high_off = 0; | |
448 | prev_off = 0; | |
449 | for (i = 0; i < s->bat_size; i++) { | |
450 | int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; | |
451 | if (off == 0) { | |
452 | prev_off = 0; | |
453 | continue; | |
454 | } | |
455 | ||
456 | /* cluster outside the image */ | |
457 | if (off > size) { | |
458 | fprintf(stderr, "%s cluster %u is outside image\n", | |
459 | fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); | |
460 | res->corruptions++; | |
461 | if (fix & BDRV_FIX_ERRORS) { | |
462 | prev_off = 0; | |
463 | s->bat_bitmap[i] = 0; | |
464 | res->corruptions_fixed++; | |
465 | flush_bat = true; | |
466 | continue; | |
467 | } | |
468 | } | |
469 | ||
470 | res->bfi.allocated_clusters++; | |
471 | if (off > high_off) { | |
472 | high_off = off; | |
473 | } | |
474 | ||
e0b5207f | 475 | if (prev_off != 0 && (prev_off + s->cluster_size) != off) { |
49ad6467 DL |
476 | res->bfi.fragmented_clusters++; |
477 | } | |
478 | prev_off = off; | |
479 | } | |
480 | ||
2fd61638 | 481 | ret = 0; |
49ad6467 | 482 | if (flush_bat) { |
d9ca2ea2 | 483 | ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); |
49ad6467 DL |
484 | if (ret < 0) { |
485 | res->check_errors++; | |
2fd61638 | 486 | goto out; |
49ad6467 DL |
487 | } |
488 | } | |
489 | ||
e0b5207f | 490 | res->image_end_offset = high_off + s->cluster_size; |
49ad6467 DL |
491 | if (size > res->image_end_offset) { |
492 | int64_t count; | |
e0b5207f | 493 | count = DIV_ROUND_UP(size - res->image_end_offset, s->cluster_size); |
49ad6467 DL |
494 | fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", |
495 | fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", | |
496 | size - res->image_end_offset); | |
497 | res->leaks += count; | |
498 | if (fix & BDRV_FIX_LEAKS) { | |
ed3d2ec9 | 499 | Error *local_err = NULL; |
e8d04f92 HR |
500 | |
501 | /* | |
502 | * In order to really repair the image, we must shrink it. | |
503 | * That means we have to pass exact=true. | |
504 | */ | |
505 | ret = bdrv_truncate(bs->file, res->image_end_offset, true, | |
7b8e4857 | 506 | PREALLOC_MODE_OFF, 0, &local_err); |
49ad6467 | 507 | if (ret < 0) { |
ed3d2ec9 | 508 | error_report_err(local_err); |
49ad6467 | 509 | res->check_errors++; |
2fd61638 | 510 | goto out; |
49ad6467 DL |
511 | } |
512 | res->leaks_fixed += count; | |
513 | } | |
514 | } | |
515 | ||
2fd61638 PB |
516 | out: |
517 | qemu_co_mutex_unlock(&s->lock); | |
518 | return ret; | |
49ad6467 DL |
519 | } |
520 | ||
521 | ||
1511b490 KW |
522 | static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts, |
523 | Error **errp) | |
74cf6c50 | 524 | { |
1511b490 KW |
525 | BlockdevCreateOptionsParallels *parallels_opts; |
526 | BlockDriverState *bs; | |
527 | BlockBackend *blk; | |
74cf6c50 | 528 | int64_t total_size, cl_size; |
369f7de9 | 529 | uint32_t bat_entries, bat_sectors; |
74cf6c50 | 530 | ParallelsHeader header; |
1511b490 | 531 | uint8_t tmp[BDRV_SECTOR_SIZE]; |
74cf6c50 DL |
532 | int ret; |
533 | ||
1511b490 KW |
534 | assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS); |
535 | parallels_opts = &opts->u.parallels; | |
536 | ||
537 | /* Sanity checks */ | |
538 | total_size = parallels_opts->size; | |
539 | ||
540 | if (parallels_opts->has_cluster_size) { | |
541 | cl_size = parallels_opts->cluster_size; | |
542 | } else { | |
543 | cl_size = DEFAULT_CLUSTER_SIZE; | |
544 | } | |
545 | ||
2332d825 KW |
546 | /* XXX What is the real limit here? This is an insanely large maximum. */ |
547 | if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) { | |
548 | error_setg(errp, "Cluster size is too large"); | |
549 | return -EINVAL; | |
550 | } | |
555a608c | 551 | if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { |
1511b490 | 552 | error_setg(errp, "Image size is too large for this cluster size"); |
555a608c KK |
553 | return -E2BIG; |
554 | } | |
74cf6c50 | 555 | |
1511b490 KW |
556 | if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) { |
557 | error_setg(errp, "Image size must be a multiple of 512 bytes"); | |
558 | return -EINVAL; | |
74cf6c50 DL |
559 | } |
560 | ||
1511b490 KW |
561 | if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) { |
562 | error_setg(errp, "Cluster size must be a multiple of 512 bytes"); | |
563 | return -EINVAL; | |
564 | } | |
565 | ||
566 | /* Create BlockBackend to write to the image */ | |
567 | bs = bdrv_open_blockdev_ref(parallels_opts->file, errp); | |
568 | if (bs == NULL) { | |
8942764f | 569 | return -EIO; |
74cf6c50 | 570 | } |
8942764f | 571 | |
a3aeeab5 EB |
572 | blk = blk_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL, |
573 | errp); | |
574 | if (!blk) { | |
575 | ret = -EPERM; | |
1511b490 KW |
576 | goto out; |
577 | } | |
578 | blk_set_allow_write_beyond_eof(blk, true); | |
8942764f | 579 | |
1511b490 | 580 | /* Create image format */ |
369f7de9 | 581 | bat_entries = DIV_ROUND_UP(total_size, cl_size); |
2d68e22e | 582 | bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); |
369f7de9 | 583 | bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; |
74cf6c50 DL |
584 | |
585 | memset(&header, 0, sizeof(header)); | |
586 | memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); | |
587 | header.version = cpu_to_le32(HEADER_VERSION); | |
588 | /* don't care much about geometry, it is not used on image level */ | |
908b1c84 KK |
589 | header.heads = cpu_to_le32(HEADS_NUMBER); |
590 | header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE | |
591 | / HEADS_NUMBER / SEC_IN_CYL); | |
74cf6c50 | 592 | header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); |
369f7de9 | 593 | header.bat_entries = cpu_to_le32(bat_entries); |
74cf6c50 | 594 | header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); |
369f7de9 | 595 | header.data_off = cpu_to_le32(bat_sectors); |
74cf6c50 DL |
596 | |
597 | /* write all the data */ | |
598 | memset(tmp, 0, sizeof(tmp)); | |
599 | memcpy(tmp, &header, sizeof(header)); | |
600 | ||
1511b490 | 601 | ret = blk_pwrite(blk, 0, tmp, BDRV_SECTOR_SIZE, 0); |
74cf6c50 DL |
602 | if (ret < 0) { |
603 | goto exit; | |
604 | } | |
1511b490 | 605 | ret = blk_pwrite_zeroes(blk, BDRV_SECTOR_SIZE, |
d004bd52 | 606 | (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); |
74cf6c50 DL |
607 | if (ret < 0) { |
608 | goto exit; | |
609 | } | |
74cf6c50 | 610 | |
1511b490 KW |
611 | ret = 0; |
612 | out: | |
613 | blk_unref(blk); | |
614 | bdrv_unref(bs); | |
74cf6c50 DL |
615 | return ret; |
616 | ||
617 | exit: | |
618 | error_setg_errno(errp, -ret, "Failed to create Parallels image"); | |
1511b490 KW |
619 | goto out; |
620 | } | |
621 | ||
b92902df ML |
622 | static int coroutine_fn parallels_co_create_opts(BlockDriver *drv, |
623 | const char *filename, | |
1511b490 KW |
624 | QemuOpts *opts, |
625 | Error **errp) | |
626 | { | |
627 | BlockdevCreateOptions *create_options = NULL; | |
1511b490 | 628 | BlockDriverState *bs = NULL; |
92adf9db | 629 | QDict *qdict; |
1511b490 KW |
630 | Visitor *v; |
631 | int ret; | |
632 | ||
633 | static const QDictRenames opt_renames[] = { | |
634 | { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" }, | |
635 | { NULL, NULL }, | |
636 | }; | |
637 | ||
638 | /* Parse options and convert legacy syntax */ | |
639 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, ¶llels_create_opts, | |
640 | true); | |
641 | ||
642 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { | |
643 | ret = -EINVAL; | |
644 | goto done; | |
645 | } | |
646 | ||
647 | /* Create and open the file (protocol layer) */ | |
668f62ec | 648 | ret = bdrv_create_file(filename, opts, errp); |
1511b490 | 649 | if (ret < 0) { |
1511b490 KW |
650 | goto done; |
651 | } | |
652 | ||
653 | bs = bdrv_open(filename, NULL, NULL, | |
654 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); | |
655 | if (bs == NULL) { | |
656 | ret = -EIO; | |
657 | goto done; | |
658 | } | |
659 | ||
660 | /* Now get the QAPI type BlockdevCreateOptions */ | |
661 | qdict_put_str(qdict, "driver", "parallels"); | |
662 | qdict_put_str(qdict, "file", bs->node_name); | |
663 | ||
af91062e MA |
664 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
665 | if (!v) { | |
1511b490 KW |
666 | ret = -EINVAL; |
667 | goto done; | |
668 | } | |
669 | ||
b11a093c | 670 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); |
1511b490 | 671 | visit_free(v); |
b11a093c | 672 | if (!create_options) { |
1511b490 KW |
673 | ret = -EINVAL; |
674 | goto done; | |
675 | } | |
676 | ||
677 | /* Silently round up sizes */ | |
678 | create_options->u.parallels.size = | |
679 | ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE); | |
680 | create_options->u.parallels.cluster_size = | |
681 | ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE); | |
682 | ||
683 | /* Create the Parallels image (format layer) */ | |
684 | ret = parallels_co_create(create_options, errp); | |
685 | if (ret < 0) { | |
686 | goto done; | |
687 | } | |
688 | ret = 0; | |
689 | ||
690 | done: | |
cb3e7f08 | 691 | qobject_unref(qdict); |
1511b490 KW |
692 | bdrv_unref(bs); |
693 | qapi_free_BlockdevCreateOptions(create_options); | |
694 | return ret; | |
74cf6c50 DL |
695 | } |
696 | ||
23d6bd3b DL |
697 | |
698 | static int parallels_probe(const uint8_t *buf, int buf_size, | |
699 | const char *filename) | |
700 | { | |
701 | const ParallelsHeader *ph = (const void *)buf; | |
702 | ||
703 | if (buf_size < sizeof(ParallelsHeader)) { | |
704 | return 0; | |
705 | } | |
706 | ||
707 | if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || | |
708 | !memcmp(ph->magic, HEADER_MAGIC2, 16)) && | |
709 | (le32_to_cpu(ph->version) == HEADER_VERSION)) { | |
710 | return 100; | |
711 | } | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
6dd6b9f1 DL |
716 | static int parallels_update_header(BlockDriverState *bs) |
717 | { | |
718 | BDRVParallelsState *s = bs->opaque; | |
9a4f4c31 KW |
719 | unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), |
720 | sizeof(ParallelsHeader)); | |
6dd6b9f1 DL |
721 | |
722 | if (size > s->header_size) { | |
723 | size = s->header_size; | |
724 | } | |
d9ca2ea2 | 725 | return bdrv_pwrite_sync(bs->file, 0, s->header, size); |
6dd6b9f1 DL |
726 | } |
727 | ||
23d6bd3b DL |
728 | static int parallels_open(BlockDriverState *bs, QDict *options, int flags, |
729 | Error **errp) | |
730 | { | |
731 | BDRVParallelsState *s = bs->opaque; | |
732 | ParallelsHeader ph; | |
19f5dc15 | 733 | int ret, size, i; |
d6179011 DL |
734 | QemuOpts *opts = NULL; |
735 | Error *local_err = NULL; | |
736 | char *buf; | |
23d6bd3b | 737 | |
8b1869da HR |
738 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds, |
739 | BDRV_CHILD_IMAGE, false, errp); | |
4e4bf5c4 KW |
740 | if (!bs->file) { |
741 | return -EINVAL; | |
742 | } | |
743 | ||
cf2ab8fc | 744 | ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); |
23d6bd3b DL |
745 | if (ret < 0) { |
746 | goto fail; | |
747 | } | |
748 | ||
749 | bs->total_sectors = le64_to_cpu(ph.nb_sectors); | |
750 | ||
751 | if (le32_to_cpu(ph.version) != HEADER_VERSION) { | |
752 | goto fail_format; | |
753 | } | |
754 | if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { | |
755 | s->off_multiplier = 1; | |
756 | bs->total_sectors = 0xffffffff & bs->total_sectors; | |
757 | } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { | |
758 | s->off_multiplier = le32_to_cpu(ph.tracks); | |
759 | } else { | |
760 | goto fail_format; | |
761 | } | |
762 | ||
763 | s->tracks = le32_to_cpu(ph.tracks); | |
764 | if (s->tracks == 0) { | |
765 | error_setg(errp, "Invalid image: Zero sectors per track"); | |
766 | ret = -EINVAL; | |
767 | goto fail; | |
768 | } | |
769 | if (s->tracks > INT32_MAX/513) { | |
770 | error_setg(errp, "Invalid image: Too big cluster"); | |
771 | ret = -EFBIG; | |
772 | goto fail; | |
773 | } | |
e0b5207f | 774 | s->cluster_size = s->tracks << BDRV_SECTOR_BITS; |
23d6bd3b DL |
775 | |
776 | s->bat_size = le32_to_cpu(ph.bat_entries); | |
777 | if (s->bat_size > INT_MAX / sizeof(uint32_t)) { | |
778 | error_setg(errp, "Catalog too large"); | |
779 | ret = -EFBIG; | |
780 | goto fail; | |
781 | } | |
782 | ||
2d68e22e | 783 | size = bat_entry_off(s->bat_size); |
9a4f4c31 KW |
784 | s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); |
785 | s->header = qemu_try_blockalign(bs->file->bs, s->header_size); | |
23d6bd3b DL |
786 | if (s->header == NULL) { |
787 | ret = -ENOMEM; | |
788 | goto fail; | |
789 | } | |
19f5dc15 DL |
790 | s->data_end = le32_to_cpu(ph.data_off); |
791 | if (s->data_end == 0) { | |
792 | s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); | |
793 | } | |
794 | if (s->data_end < s->header_size) { | |
23d6bd3b DL |
795 | /* there is not enough unused space to fit to block align between BAT |
796 | and actual data. We can't avoid read-modify-write... */ | |
797 | s->header_size = size; | |
798 | } | |
799 | ||
cf2ab8fc | 800 | ret = bdrv_pread(bs->file, 0, s->header, s->header_size); |
23d6bd3b DL |
801 | if (ret < 0) { |
802 | goto fail; | |
803 | } | |
804 | s->bat_bitmap = (uint32_t *)(s->header + 1); | |
805 | ||
19f5dc15 DL |
806 | for (i = 0; i < s->bat_size; i++) { |
807 | int64_t off = bat2sect(s, i); | |
808 | if (off >= s->data_end) { | |
809 | s->data_end = off + s->tracks; | |
810 | } | |
811 | } | |
812 | ||
6dd6b9f1 DL |
813 | if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { |
814 | /* Image was not closed correctly. The check is mandatory */ | |
815 | s->header_unclean = true; | |
816 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { | |
817 | error_setg(errp, "parallels: Image was not closed correctly; " | |
818 | "cannot be opened read/write"); | |
819 | ret = -EACCES; | |
820 | goto fail; | |
821 | } | |
822 | } | |
823 | ||
c6ecec43 MA |
824 | opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, errp); |
825 | if (!opts) { | |
d6179011 DL |
826 | goto fail_options; |
827 | } | |
828 | ||
a5f9b9df | 829 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
d6179011 DL |
830 | goto fail_options; |
831 | } | |
832 | ||
833 | s->prealloc_size = | |
834 | qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); | |
835 | s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); | |
836 | buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); | |
bda4cdcb | 837 | /* prealloc_mode can be downgraded later during allocate_clusters */ |
f7abe0ec | 838 | s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, |
06c60b6c MA |
839 | PRL_PREALLOC_MODE_FALLOCATE, |
840 | &local_err); | |
d6179011 DL |
841 | g_free(buf); |
842 | if (local_err != NULL) { | |
4bc6d7ee | 843 | error_propagate(errp, local_err); |
d6179011 DL |
844 | goto fail_options; |
845 | } | |
dc62da88 | 846 | |
baefd977 VSO |
847 | if (ph.ext_off) { |
848 | if (flags & BDRV_O_RDWR) { | |
849 | /* | |
850 | * It's unsafe to open image RW if there is an extension (as we | |
851 | * don't support it). But parallels driver in QEMU historically | |
852 | * ignores the extension, so print warning and don't care. | |
853 | */ | |
854 | warn_report("Format Extension ignored in RW mode"); | |
855 | } else { | |
856 | ret = parallels_read_format_extension( | |
857 | bs, le64_to_cpu(ph.ext_off) << BDRV_SECTOR_BITS, errp); | |
858 | if (ret < 0) { | |
859 | goto fail; | |
860 | } | |
861 | } | |
862 | } | |
863 | ||
6c7d390b | 864 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { |
6dd6b9f1 DL |
865 | s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); |
866 | ret = parallels_update_header(bs); | |
867 | if (ret < 0) { | |
868 | goto fail; | |
869 | } | |
870 | } | |
871 | ||
038adc2f | 872 | s->bat_dirty_block = 4 * qemu_real_host_page_size; |
0d31c7c2 DL |
873 | s->bat_dirty_bmap = |
874 | bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); | |
875 | ||
1d0f37cf JC |
876 | /* Disable migration until bdrv_invalidate_cache method is added */ |
877 | error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " | |
878 | "does not support live migration", | |
879 | bdrv_get_device_or_node_name(bs)); | |
386f6c07 MA |
880 | ret = migrate_add_blocker(s->migration_blocker, errp); |
881 | if (ret < 0) { | |
1d0f37cf JC |
882 | error_free(s->migration_blocker); |
883 | goto fail; | |
884 | } | |
23d6bd3b DL |
885 | qemu_co_mutex_init(&s->lock); |
886 | return 0; | |
887 | ||
888 | fail_format: | |
889 | error_setg(errp, "Image not in Parallels format"); | |
4bc6d7ee | 890 | fail_options: |
23d6bd3b DL |
891 | ret = -EINVAL; |
892 | fail: | |
893 | qemu_vfree(s->header); | |
894 | return ret; | |
895 | } | |
896 | ||
897 | ||
6ada7453 TS |
898 | static void parallels_close(BlockDriverState *bs) |
899 | { | |
900 | BDRVParallelsState *s = bs->opaque; | |
6dd6b9f1 | 901 | |
6c7d390b | 902 | if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { |
6dd6b9f1 DL |
903 | s->header->inuse = 0; |
904 | parallels_update_header(bs); | |
e8d04f92 HR |
905 | |
906 | /* errors are ignored, so we might as well pass exact=true */ | |
907 | bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, true, | |
7b8e4857 | 908 | PREALLOC_MODE_OFF, 0, NULL); |
19f5dc15 DL |
909 | } |
910 | ||
0d31c7c2 | 911 | g_free(s->bat_dirty_bmap); |
9eae9cca | 912 | qemu_vfree(s->header); |
1d0f37cf JC |
913 | |
914 | migrate_del_blocker(s->migration_blocker); | |
915 | error_free(s->migration_blocker); | |
6ada7453 TS |
916 | } |
917 | ||
5efa9d5a | 918 | static BlockDriver bdrv_parallels = { |
e60f469c AJ |
919 | .format_name = "parallels", |
920 | .instance_size = sizeof(BDRVParallelsState), | |
921 | .bdrv_probe = parallels_probe, | |
1dec5a70 | 922 | .bdrv_open = parallels_open, |
e60f469c | 923 | .bdrv_close = parallels_close, |
69dca43d | 924 | .bdrv_child_perm = bdrv_default_perms, |
8e0cf59d | 925 | .bdrv_co_block_status = parallels_co_block_status, |
d0e61ce5 | 926 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
0d31c7c2 | 927 | .bdrv_co_flush_to_os = parallels_co_flush_to_os, |
481fb9cf | 928 | .bdrv_co_readv = parallels_co_readv, |
5a41e1fa | 929 | .bdrv_co_writev = parallels_co_writev, |
d67066d8 | 930 | .is_format = true, |
bcbb3866 | 931 | .supports_backing = true, |
1511b490 | 932 | .bdrv_co_create = parallels_co_create, |
efc75e2a | 933 | .bdrv_co_create_opts = parallels_co_create_opts, |
2fd61638 | 934 | .bdrv_co_check = parallels_co_check, |
74cf6c50 | 935 | .create_opts = ¶llels_create_opts, |
6ada7453 | 936 | }; |
5efa9d5a AL |
937 | |
938 | static void bdrv_parallels_init(void) | |
939 | { | |
940 | bdrv_register(&bdrv_parallels); | |
941 | } | |
942 | ||
943 | block_init(bdrv_parallels_init); |