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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 | */ | |
80c71a24 | 30 | #include "qemu/osdep.h" |
da34e65c | 31 | #include "qapi/error.h" |
faf07963 | 32 | #include "qemu-common.h" |
737e150e | 33 | #include "block/block_int.h" |
8942764f | 34 | #include "sysemu/block-backend.h" |
1de7afc9 | 35 | #include "qemu/module.h" |
58369e22 | 36 | #include "qemu/bswap.h" |
0d31c7c2 | 37 | #include "qemu/bitmap.h" |
d6179011 | 38 | #include "qapi/util.h" |
6ada7453 TS |
39 | |
40 | /**************************************************************/ | |
41 | ||
42 | #define HEADER_MAGIC "WithoutFreeSpace" | |
d25d5980 | 43 | #define HEADER_MAGIC2 "WithouFreSpacExt" |
6ada7453 | 44 | #define HEADER_VERSION 2 |
6dd6b9f1 | 45 | #define HEADER_INUSE_MAGIC (0x746F6E59) |
555a608c | 46 | #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32) |
6ada7453 | 47 | |
74cf6c50 DL |
48 | #define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */ |
49 | ||
50 | ||
6ada7453 | 51 | // always little-endian |
07898904 | 52 | typedef struct ParallelsHeader { |
6ada7453 TS |
53 | char magic[16]; // "WithoutFreeSpace" |
54 | uint32_t version; | |
55 | uint32_t heads; | |
56 | uint32_t cylinders; | |
57 | uint32_t tracks; | |
369f7de9 | 58 | uint32_t bat_entries; |
8c27d54f DL |
59 | uint64_t nb_sectors; |
60 | uint32_t inuse; | |
61 | uint32_t data_off; | |
62 | char padding[12]; | |
07898904 | 63 | } QEMU_PACKED ParallelsHeader; |
6ada7453 | 64 | |
d6179011 DL |
65 | |
66 | typedef enum ParallelsPreallocMode { | |
67 | PRL_PREALLOC_MODE_FALLOCATE = 0, | |
68 | PRL_PREALLOC_MODE_TRUNCATE = 1, | |
7fb1cf16 | 69 | PRL_PREALLOC_MODE__MAX = 2, |
d6179011 DL |
70 | } ParallelsPreallocMode; |
71 | ||
72 | static const char *prealloc_mode_lookup[] = { | |
73 | "falloc", | |
74 | "truncate", | |
75 | NULL, | |
76 | }; | |
77 | ||
78 | ||
6ada7453 | 79 | typedef struct BDRVParallelsState { |
481fb9cf DL |
80 | /** Locking is conservative, the lock protects |
81 | * - image file extending (truncate, fallocate) | |
82 | * - any access to block allocation table | |
83 | */ | |
848c66e8 | 84 | CoMutex lock; |
6ada7453 | 85 | |
9eae9cca DL |
86 | ParallelsHeader *header; |
87 | uint32_t header_size; | |
6dd6b9f1 DL |
88 | bool header_unclean; |
89 | ||
0d31c7c2 DL |
90 | unsigned long *bat_dirty_bmap; |
91 | unsigned int bat_dirty_block; | |
92 | ||
369f7de9 DL |
93 | uint32_t *bat_bitmap; |
94 | unsigned int bat_size; | |
6ada7453 | 95 | |
19f5dc15 | 96 | int64_t data_end; |
d6179011 DL |
97 | uint64_t prealloc_size; |
98 | ParallelsPreallocMode prealloc_mode; | |
99 | ||
9302e863 | 100 | unsigned int tracks; |
d25d5980 DL |
101 | |
102 | unsigned int off_multiplier; | |
6ada7453 TS |
103 | } BDRVParallelsState; |
104 | ||
555cc9d9 | 105 | |
d6179011 DL |
106 | #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" |
107 | #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" | |
108 | ||
109 | static QemuOptsList parallels_runtime_opts = { | |
110 | .name = "parallels", | |
111 | .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head), | |
112 | .desc = { | |
113 | { | |
114 | .name = PARALLELS_OPT_PREALLOC_SIZE, | |
115 | .type = QEMU_OPT_SIZE, | |
116 | .help = "Preallocation size on image expansion", | |
ff5bbe56 | 117 | .def_value_str = "128M", |
d6179011 DL |
118 | }, |
119 | { | |
120 | .name = PARALLELS_OPT_PREALLOC_MODE, | |
121 | .type = QEMU_OPT_STRING, | |
122 | .help = "Preallocation mode on image expansion " | |
123 | "(allowed values: falloc, truncate)", | |
124 | .def_value_str = "falloc", | |
125 | }, | |
126 | { /* end of list */ }, | |
127 | }, | |
128 | }; | |
129 | ||
130 | ||
555cc9d9 DL |
131 | static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) |
132 | { | |
dd97cdc0 | 133 | return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; |
555cc9d9 DL |
134 | } |
135 | ||
2d68e22e DL |
136 | static uint32_t bat_entry_off(uint32_t idx) |
137 | { | |
138 | return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; | |
139 | } | |
140 | ||
29442569 | 141 | static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) |
6ada7453 | 142 | { |
c34d2451 | 143 | uint32_t index, offset; |
6ada7453 TS |
144 | |
145 | index = sector_num / s->tracks; | |
146 | offset = sector_num % s->tracks; | |
147 | ||
9d8b88f6 | 148 | /* not allocated */ |
369f7de9 | 149 | if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { |
f08e2f84 | 150 | return -1; |
369f7de9 | 151 | } |
555cc9d9 | 152 | return bat2sect(s, index) + offset; |
6ada7453 TS |
153 | } |
154 | ||
9de9da17 RK |
155 | static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num, |
156 | int nb_sectors) | |
157 | { | |
158 | int ret = s->tracks - sector_num % s->tracks; | |
159 | return MIN(nb_sectors, ret); | |
160 | } | |
161 | ||
6953d920 DL |
162 | static int64_t block_status(BDRVParallelsState *s, int64_t sector_num, |
163 | int nb_sectors, int *pnum) | |
164 | { | |
165 | int64_t start_off = -2, prev_end_off = -2; | |
166 | ||
167 | *pnum = 0; | |
168 | while (nb_sectors > 0 || start_off == -2) { | |
169 | int64_t offset = seek_to_sector(s, sector_num); | |
170 | int to_end; | |
171 | ||
172 | if (start_off == -2) { | |
173 | start_off = offset; | |
174 | prev_end_off = offset; | |
175 | } else if (offset != prev_end_off) { | |
176 | break; | |
177 | } | |
178 | ||
179 | to_end = cluster_remainder(s, sector_num, nb_sectors); | |
180 | nb_sectors -= to_end; | |
181 | sector_num += to_end; | |
182 | *pnum += to_end; | |
183 | ||
184 | if (offset > 0) { | |
185 | prev_end_off += to_end; | |
186 | } | |
187 | } | |
188 | return start_off; | |
189 | } | |
190 | ||
ddd2ef2c DL |
191 | static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num, |
192 | int nb_sectors, int *pnum) | |
5a41e1fa DL |
193 | { |
194 | BDRVParallelsState *s = bs->opaque; | |
d8b83e37 | 195 | int64_t pos, space, idx, to_allocate, i, len; |
5a41e1fa | 196 | |
ddd2ef2c DL |
197 | pos = block_status(s, sector_num, nb_sectors, pnum); |
198 | if (pos > 0) { | |
199 | return pos; | |
200 | } | |
5a41e1fa | 201 | |
ddd2ef2c | 202 | idx = sector_num / s->tracks; |
969401fe | 203 | to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; |
86d1bd70 HR |
204 | |
205 | /* This function is called only by parallels_co_writev(), which will never | |
206 | * pass a sector_num at or beyond the end of the image (because the block | |
207 | * layer never passes such a sector_num to that function). Therefore, idx | |
208 | * is always below s->bat_size. | |
209 | * block_status() will limit *pnum so that sector_num + *pnum will not | |
210 | * exceed the image end. Therefore, idx + to_allocate cannot exceed | |
211 | * s->bat_size. | |
212 | * Note that s->bat_size is an unsigned int, therefore idx + to_allocate | |
213 | * will always fit into a uint32_t. */ | |
214 | assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); | |
215 | ||
ddd2ef2c | 216 | space = to_allocate * s->tracks; |
d8b83e37 DL |
217 | len = bdrv_getlength(bs->file->bs); |
218 | if (len < 0) { | |
219 | return len; | |
220 | } | |
221 | if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { | |
19f5dc15 | 222 | int ret; |
ddd2ef2c | 223 | space += s->prealloc_size; |
19f5dc15 | 224 | if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { |
720ff280 | 225 | ret = bdrv_pwrite_zeroes(bs->file, |
74021bc4 EB |
226 | s->data_end << BDRV_SECTOR_BITS, |
227 | space << BDRV_SECTOR_BITS, 0); | |
19f5dc15 | 228 | } else { |
52cdbc58 | 229 | ret = bdrv_truncate(bs->file, |
ed3d2ec9 | 230 | (s->data_end + space) << BDRV_SECTOR_BITS, |
7ea37c30 | 231 | PREALLOC_MODE_OFF, NULL); |
19f5dc15 DL |
232 | } |
233 | if (ret < 0) { | |
234 | return ret; | |
235 | } | |
5a41e1fa DL |
236 | } |
237 | ||
ddd2ef2c DL |
238 | for (i = 0; i < to_allocate; i++) { |
239 | s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); | |
240 | s->data_end += s->tracks; | |
241 | bitmap_set(s->bat_dirty_bmap, | |
c9f6856d | 242 | bat_entry_off(idx + i) / s->bat_dirty_block, 1); |
ddd2ef2c | 243 | } |
0d31c7c2 | 244 | |
ddd2ef2c | 245 | return bat2sect(s, idx) + sector_num % s->tracks; |
5a41e1fa DL |
246 | } |
247 | ||
0d31c7c2 DL |
248 | |
249 | static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) | |
250 | { | |
251 | BDRVParallelsState *s = bs->opaque; | |
252 | unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); | |
253 | unsigned long bit; | |
254 | ||
255 | qemu_co_mutex_lock(&s->lock); | |
256 | ||
257 | bit = find_first_bit(s->bat_dirty_bmap, size); | |
258 | while (bit < size) { | |
259 | uint32_t off = bit * s->bat_dirty_block; | |
260 | uint32_t to_write = s->bat_dirty_block; | |
261 | int ret; | |
262 | ||
263 | if (off + to_write > s->header_size) { | |
264 | to_write = s->header_size - off; | |
265 | } | |
d9ca2ea2 | 266 | ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, |
9a4f4c31 | 267 | to_write); |
0d31c7c2 DL |
268 | if (ret < 0) { |
269 | qemu_co_mutex_unlock(&s->lock); | |
270 | return ret; | |
271 | } | |
272 | bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); | |
273 | } | |
274 | bitmap_zero(s->bat_dirty_bmap, size); | |
275 | ||
276 | qemu_co_mutex_unlock(&s->lock); | |
277 | return 0; | |
278 | } | |
279 | ||
280 | ||
dd3bed16 | 281 | static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs, |
67a0fd2a | 282 | int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) |
dd3bed16 RK |
283 | { |
284 | BDRVParallelsState *s = bs->opaque; | |
285 | int64_t offset; | |
286 | ||
287 | qemu_co_mutex_lock(&s->lock); | |
6953d920 | 288 | offset = block_status(s, sector_num, nb_sectors, pnum); |
dd3bed16 RK |
289 | qemu_co_mutex_unlock(&s->lock); |
290 | ||
dd3bed16 RK |
291 | if (offset < 0) { |
292 | return 0; | |
293 | } | |
294 | ||
ddf4987d | 295 | *file = bs->file->bs; |
dd3bed16 RK |
296 | return (offset << BDRV_SECTOR_BITS) | |
297 | BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; | |
298 | } | |
299 | ||
5a41e1fa DL |
300 | static coroutine_fn int parallels_co_writev(BlockDriverState *bs, |
301 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
302 | { | |
303 | BDRVParallelsState *s = bs->opaque; | |
304 | uint64_t bytes_done = 0; | |
305 | QEMUIOVector hd_qiov; | |
306 | int ret = 0; | |
307 | ||
308 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
309 | ||
310 | while (nb_sectors > 0) { | |
311 | int64_t position; | |
312 | int n, nbytes; | |
313 | ||
314 | qemu_co_mutex_lock(&s->lock); | |
ddd2ef2c | 315 | position = allocate_clusters(bs, sector_num, nb_sectors, &n); |
5a41e1fa DL |
316 | qemu_co_mutex_unlock(&s->lock); |
317 | if (position < 0) { | |
318 | ret = (int)position; | |
319 | break; | |
320 | } | |
321 | ||
5a41e1fa DL |
322 | nbytes = n << BDRV_SECTOR_BITS; |
323 | ||
324 | qemu_iovec_reset(&hd_qiov); | |
325 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); | |
326 | ||
25ec177d | 327 | ret = bdrv_co_writev(bs->file, position, n, &hd_qiov); |
5a41e1fa DL |
328 | if (ret < 0) { |
329 | break; | |
330 | } | |
331 | ||
332 | nb_sectors -= n; | |
333 | sector_num += n; | |
334 | bytes_done += nbytes; | |
335 | } | |
336 | ||
337 | qemu_iovec_destroy(&hd_qiov); | |
338 | return ret; | |
339 | } | |
340 | ||
481fb9cf DL |
341 | static coroutine_fn int parallels_co_readv(BlockDriverState *bs, |
342 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
6ada7453 | 343 | { |
29442569 | 344 | BDRVParallelsState *s = bs->opaque; |
481fb9cf DL |
345 | uint64_t bytes_done = 0; |
346 | QEMUIOVector hd_qiov; | |
347 | int ret = 0; | |
348 | ||
349 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
29442569 | 350 | |
6ada7453 | 351 | while (nb_sectors > 0) { |
481fb9cf DL |
352 | int64_t position; |
353 | int n, nbytes; | |
354 | ||
355 | qemu_co_mutex_lock(&s->lock); | |
6953d920 | 356 | position = block_status(s, sector_num, nb_sectors, &n); |
481fb9cf DL |
357 | qemu_co_mutex_unlock(&s->lock); |
358 | ||
481fb9cf DL |
359 | nbytes = n << BDRV_SECTOR_BITS; |
360 | ||
361 | if (position < 0) { | |
362 | qemu_iovec_memset(qiov, bytes_done, 0, nbytes); | |
363 | } else { | |
364 | qemu_iovec_reset(&hd_qiov); | |
365 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); | |
366 | ||
28b04a8f | 367 | ret = bdrv_co_readv(bs->file, position, n, &hd_qiov); |
29442569 | 368 | if (ret < 0) { |
481fb9cf | 369 | break; |
29442569 | 370 | } |
9d8b88f6 | 371 | } |
481fb9cf | 372 | |
9de9da17 RK |
373 | nb_sectors -= n; |
374 | sector_num += n; | |
481fb9cf | 375 | bytes_done += nbytes; |
6ada7453 | 376 | } |
6ada7453 | 377 | |
481fb9cf | 378 | qemu_iovec_destroy(&hd_qiov); |
2914caa0 PB |
379 | return ret; |
380 | } | |
381 | ||
49ad6467 DL |
382 | |
383 | static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res, | |
384 | BdrvCheckMode fix) | |
385 | { | |
386 | BDRVParallelsState *s = bs->opaque; | |
387 | int64_t size, prev_off, high_off; | |
388 | int ret; | |
389 | uint32_t i; | |
390 | bool flush_bat = false; | |
391 | int cluster_size = s->tracks << BDRV_SECTOR_BITS; | |
392 | ||
9a4f4c31 | 393 | size = bdrv_getlength(bs->file->bs); |
49ad6467 DL |
394 | if (size < 0) { |
395 | res->check_errors++; | |
396 | return size; | |
397 | } | |
398 | ||
6dd6b9f1 DL |
399 | if (s->header_unclean) { |
400 | fprintf(stderr, "%s image was not closed correctly\n", | |
401 | fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); | |
402 | res->corruptions++; | |
403 | if (fix & BDRV_FIX_ERRORS) { | |
404 | /* parallels_close will do the job right */ | |
405 | res->corruptions_fixed++; | |
406 | s->header_unclean = false; | |
407 | } | |
408 | } | |
409 | ||
49ad6467 DL |
410 | res->bfi.total_clusters = s->bat_size; |
411 | res->bfi.compressed_clusters = 0; /* compression is not supported */ | |
412 | ||
413 | high_off = 0; | |
414 | prev_off = 0; | |
415 | for (i = 0; i < s->bat_size; i++) { | |
416 | int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; | |
417 | if (off == 0) { | |
418 | prev_off = 0; | |
419 | continue; | |
420 | } | |
421 | ||
422 | /* cluster outside the image */ | |
423 | if (off > size) { | |
424 | fprintf(stderr, "%s cluster %u is outside image\n", | |
425 | fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); | |
426 | res->corruptions++; | |
427 | if (fix & BDRV_FIX_ERRORS) { | |
428 | prev_off = 0; | |
429 | s->bat_bitmap[i] = 0; | |
430 | res->corruptions_fixed++; | |
431 | flush_bat = true; | |
432 | continue; | |
433 | } | |
434 | } | |
435 | ||
436 | res->bfi.allocated_clusters++; | |
437 | if (off > high_off) { | |
438 | high_off = off; | |
439 | } | |
440 | ||
441 | if (prev_off != 0 && (prev_off + cluster_size) != off) { | |
442 | res->bfi.fragmented_clusters++; | |
443 | } | |
444 | prev_off = off; | |
445 | } | |
446 | ||
447 | if (flush_bat) { | |
d9ca2ea2 | 448 | ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); |
49ad6467 DL |
449 | if (ret < 0) { |
450 | res->check_errors++; | |
451 | return ret; | |
452 | } | |
453 | } | |
454 | ||
455 | res->image_end_offset = high_off + cluster_size; | |
456 | if (size > res->image_end_offset) { | |
457 | int64_t count; | |
458 | count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); | |
459 | fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", | |
460 | fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", | |
461 | size - res->image_end_offset); | |
462 | res->leaks += count; | |
463 | if (fix & BDRV_FIX_LEAKS) { | |
ed3d2ec9 | 464 | Error *local_err = NULL; |
7ea37c30 HR |
465 | ret = bdrv_truncate(bs->file, res->image_end_offset, |
466 | PREALLOC_MODE_OFF, &local_err); | |
49ad6467 | 467 | if (ret < 0) { |
ed3d2ec9 | 468 | error_report_err(local_err); |
49ad6467 DL |
469 | res->check_errors++; |
470 | return ret; | |
471 | } | |
472 | res->leaks_fixed += count; | |
473 | } | |
474 | } | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | ||
74cf6c50 DL |
480 | static int parallels_create(const char *filename, QemuOpts *opts, Error **errp) |
481 | { | |
482 | int64_t total_size, cl_size; | |
483 | uint8_t tmp[BDRV_SECTOR_SIZE]; | |
484 | Error *local_err = NULL; | |
8942764f | 485 | BlockBackend *file; |
369f7de9 | 486 | uint32_t bat_entries, bat_sectors; |
74cf6c50 DL |
487 | ParallelsHeader header; |
488 | int ret; | |
489 | ||
490 | total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), | |
491 | BDRV_SECTOR_SIZE); | |
492 | cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, | |
493 | DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE); | |
555a608c KK |
494 | if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { |
495 | error_propagate(errp, local_err); | |
496 | return -E2BIG; | |
497 | } | |
74cf6c50 DL |
498 | |
499 | ret = bdrv_create_file(filename, opts, &local_err); | |
500 | if (ret < 0) { | |
501 | error_propagate(errp, local_err); | |
502 | return ret; | |
503 | } | |
504 | ||
efaa7c4e | 505 | file = blk_new_open(filename, NULL, NULL, |
55880601 KW |
506 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, |
507 | &local_err); | |
8942764f | 508 | if (file == NULL) { |
74cf6c50 | 509 | error_propagate(errp, local_err); |
8942764f | 510 | return -EIO; |
74cf6c50 | 511 | } |
8942764f KW |
512 | |
513 | blk_set_allow_write_beyond_eof(file, true); | |
514 | ||
3a691c50 | 515 | ret = blk_truncate(file, 0, PREALLOC_MODE_OFF, errp); |
74cf6c50 DL |
516 | if (ret < 0) { |
517 | goto exit; | |
518 | } | |
519 | ||
369f7de9 | 520 | bat_entries = DIV_ROUND_UP(total_size, cl_size); |
2d68e22e | 521 | bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); |
369f7de9 | 522 | bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; |
74cf6c50 DL |
523 | |
524 | memset(&header, 0, sizeof(header)); | |
525 | memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); | |
526 | header.version = cpu_to_le32(HEADER_VERSION); | |
527 | /* don't care much about geometry, it is not used on image level */ | |
528 | header.heads = cpu_to_le32(16); | |
529 | header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32); | |
530 | header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); | |
369f7de9 | 531 | header.bat_entries = cpu_to_le32(bat_entries); |
74cf6c50 | 532 | header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); |
369f7de9 | 533 | header.data_off = cpu_to_le32(bat_sectors); |
74cf6c50 DL |
534 | |
535 | /* write all the data */ | |
536 | memset(tmp, 0, sizeof(tmp)); | |
537 | memcpy(tmp, &header, sizeof(header)); | |
538 | ||
8341f00d | 539 | ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0); |
74cf6c50 DL |
540 | if (ret < 0) { |
541 | goto exit; | |
542 | } | |
d004bd52 EB |
543 | ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE, |
544 | (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); | |
74cf6c50 DL |
545 | if (ret < 0) { |
546 | goto exit; | |
547 | } | |
548 | ret = 0; | |
549 | ||
550 | done: | |
8942764f | 551 | blk_unref(file); |
74cf6c50 DL |
552 | return ret; |
553 | ||
554 | exit: | |
555 | error_setg_errno(errp, -ret, "Failed to create Parallels image"); | |
556 | goto done; | |
557 | } | |
558 | ||
23d6bd3b DL |
559 | |
560 | static int parallels_probe(const uint8_t *buf, int buf_size, | |
561 | const char *filename) | |
562 | { | |
563 | const ParallelsHeader *ph = (const void *)buf; | |
564 | ||
565 | if (buf_size < sizeof(ParallelsHeader)) { | |
566 | return 0; | |
567 | } | |
568 | ||
569 | if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || | |
570 | !memcmp(ph->magic, HEADER_MAGIC2, 16)) && | |
571 | (le32_to_cpu(ph->version) == HEADER_VERSION)) { | |
572 | return 100; | |
573 | } | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
6dd6b9f1 DL |
578 | static int parallels_update_header(BlockDriverState *bs) |
579 | { | |
580 | BDRVParallelsState *s = bs->opaque; | |
9a4f4c31 KW |
581 | unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), |
582 | sizeof(ParallelsHeader)); | |
6dd6b9f1 DL |
583 | |
584 | if (size > s->header_size) { | |
585 | size = s->header_size; | |
586 | } | |
d9ca2ea2 | 587 | return bdrv_pwrite_sync(bs->file, 0, s->header, size); |
6dd6b9f1 DL |
588 | } |
589 | ||
23d6bd3b DL |
590 | static int parallels_open(BlockDriverState *bs, QDict *options, int flags, |
591 | Error **errp) | |
592 | { | |
593 | BDRVParallelsState *s = bs->opaque; | |
594 | ParallelsHeader ph; | |
19f5dc15 | 595 | int ret, size, i; |
d6179011 DL |
596 | QemuOpts *opts = NULL; |
597 | Error *local_err = NULL; | |
598 | char *buf; | |
23d6bd3b | 599 | |
4e4bf5c4 KW |
600 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
601 | false, errp); | |
602 | if (!bs->file) { | |
603 | return -EINVAL; | |
604 | } | |
605 | ||
cf2ab8fc | 606 | ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); |
23d6bd3b DL |
607 | if (ret < 0) { |
608 | goto fail; | |
609 | } | |
610 | ||
611 | bs->total_sectors = le64_to_cpu(ph.nb_sectors); | |
612 | ||
613 | if (le32_to_cpu(ph.version) != HEADER_VERSION) { | |
614 | goto fail_format; | |
615 | } | |
616 | if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { | |
617 | s->off_multiplier = 1; | |
618 | bs->total_sectors = 0xffffffff & bs->total_sectors; | |
619 | } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { | |
620 | s->off_multiplier = le32_to_cpu(ph.tracks); | |
621 | } else { | |
622 | goto fail_format; | |
623 | } | |
624 | ||
625 | s->tracks = le32_to_cpu(ph.tracks); | |
626 | if (s->tracks == 0) { | |
627 | error_setg(errp, "Invalid image: Zero sectors per track"); | |
628 | ret = -EINVAL; | |
629 | goto fail; | |
630 | } | |
631 | if (s->tracks > INT32_MAX/513) { | |
632 | error_setg(errp, "Invalid image: Too big cluster"); | |
633 | ret = -EFBIG; | |
634 | goto fail; | |
635 | } | |
636 | ||
637 | s->bat_size = le32_to_cpu(ph.bat_entries); | |
638 | if (s->bat_size > INT_MAX / sizeof(uint32_t)) { | |
639 | error_setg(errp, "Catalog too large"); | |
640 | ret = -EFBIG; | |
641 | goto fail; | |
642 | } | |
643 | ||
2d68e22e | 644 | size = bat_entry_off(s->bat_size); |
9a4f4c31 KW |
645 | s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); |
646 | s->header = qemu_try_blockalign(bs->file->bs, s->header_size); | |
23d6bd3b DL |
647 | if (s->header == NULL) { |
648 | ret = -ENOMEM; | |
649 | goto fail; | |
650 | } | |
19f5dc15 DL |
651 | s->data_end = le32_to_cpu(ph.data_off); |
652 | if (s->data_end == 0) { | |
653 | s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); | |
654 | } | |
655 | if (s->data_end < s->header_size) { | |
23d6bd3b DL |
656 | /* there is not enough unused space to fit to block align between BAT |
657 | and actual data. We can't avoid read-modify-write... */ | |
658 | s->header_size = size; | |
659 | } | |
660 | ||
cf2ab8fc | 661 | ret = bdrv_pread(bs->file, 0, s->header, s->header_size); |
23d6bd3b DL |
662 | if (ret < 0) { |
663 | goto fail; | |
664 | } | |
665 | s->bat_bitmap = (uint32_t *)(s->header + 1); | |
666 | ||
19f5dc15 DL |
667 | for (i = 0; i < s->bat_size; i++) { |
668 | int64_t off = bat2sect(s, i); | |
669 | if (off >= s->data_end) { | |
670 | s->data_end = off + s->tracks; | |
671 | } | |
672 | } | |
673 | ||
6dd6b9f1 DL |
674 | if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { |
675 | /* Image was not closed correctly. The check is mandatory */ | |
676 | s->header_unclean = true; | |
677 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { | |
678 | error_setg(errp, "parallels: Image was not closed correctly; " | |
679 | "cannot be opened read/write"); | |
680 | ret = -EACCES; | |
681 | goto fail; | |
682 | } | |
683 | } | |
684 | ||
d6179011 DL |
685 | opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err); |
686 | if (local_err != NULL) { | |
687 | goto fail_options; | |
688 | } | |
689 | ||
690 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
691 | if (local_err != NULL) { | |
692 | goto fail_options; | |
693 | } | |
694 | ||
695 | s->prealloc_size = | |
696 | qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); | |
697 | s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); | |
698 | buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); | |
699 | s->prealloc_mode = qapi_enum_parse(prealloc_mode_lookup, buf, | |
7fb1cf16 | 700 | PRL_PREALLOC_MODE__MAX, PRL_PREALLOC_MODE_FALLOCATE, &local_err); |
d6179011 DL |
701 | g_free(buf); |
702 | if (local_err != NULL) { | |
703 | goto fail_options; | |
704 | } | |
dc62da88 | 705 | |
e5e62683 | 706 | if (!bdrv_has_zero_init(bs->file->bs)) { |
d6179011 DL |
707 | s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; |
708 | } | |
709 | ||
6dd6b9f1 DL |
710 | if (flags & BDRV_O_RDWR) { |
711 | s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); | |
712 | ret = parallels_update_header(bs); | |
713 | if (ret < 0) { | |
714 | goto fail; | |
715 | } | |
716 | } | |
717 | ||
0d31c7c2 DL |
718 | s->bat_dirty_block = 4 * getpagesize(); |
719 | s->bat_dirty_bmap = | |
720 | bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); | |
721 | ||
23d6bd3b DL |
722 | qemu_co_mutex_init(&s->lock); |
723 | return 0; | |
724 | ||
725 | fail_format: | |
726 | error_setg(errp, "Image not in Parallels format"); | |
727 | ret = -EINVAL; | |
728 | fail: | |
729 | qemu_vfree(s->header); | |
730 | return ret; | |
d6179011 DL |
731 | |
732 | fail_options: | |
733 | error_propagate(errp, local_err); | |
734 | ret = -EINVAL; | |
735 | goto fail; | |
23d6bd3b DL |
736 | } |
737 | ||
738 | ||
6ada7453 TS |
739 | static void parallels_close(BlockDriverState *bs) |
740 | { | |
741 | BDRVParallelsState *s = bs->opaque; | |
6dd6b9f1 DL |
742 | |
743 | if (bs->open_flags & BDRV_O_RDWR) { | |
744 | s->header->inuse = 0; | |
745 | parallels_update_header(bs); | |
746 | } | |
747 | ||
19f5dc15 | 748 | if (bs->open_flags & BDRV_O_RDWR) { |
7ea37c30 HR |
749 | bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, |
750 | PREALLOC_MODE_OFF, NULL); | |
19f5dc15 DL |
751 | } |
752 | ||
0d31c7c2 | 753 | g_free(s->bat_dirty_bmap); |
9eae9cca | 754 | qemu_vfree(s->header); |
6ada7453 TS |
755 | } |
756 | ||
74cf6c50 DL |
757 | static QemuOptsList parallels_create_opts = { |
758 | .name = "parallels-create-opts", | |
759 | .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), | |
760 | .desc = { | |
761 | { | |
762 | .name = BLOCK_OPT_SIZE, | |
763 | .type = QEMU_OPT_SIZE, | |
764 | .help = "Virtual disk size", | |
765 | }, | |
766 | { | |
767 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
768 | .type = QEMU_OPT_SIZE, | |
769 | .help = "Parallels image cluster size", | |
770 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), | |
771 | }, | |
772 | { /* end of list */ } | |
773 | } | |
774 | }; | |
775 | ||
5efa9d5a | 776 | static BlockDriver bdrv_parallels = { |
e60f469c AJ |
777 | .format_name = "parallels", |
778 | .instance_size = sizeof(BDRVParallelsState), | |
779 | .bdrv_probe = parallels_probe, | |
1dec5a70 | 780 | .bdrv_open = parallels_open, |
e60f469c | 781 | .bdrv_close = parallels_close, |
862f215f | 782 | .bdrv_child_perm = bdrv_format_default_perms, |
dd3bed16 | 783 | .bdrv_co_get_block_status = parallels_co_get_block_status, |
d0e61ce5 | 784 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
0d31c7c2 | 785 | .bdrv_co_flush_to_os = parallels_co_flush_to_os, |
481fb9cf | 786 | .bdrv_co_readv = parallels_co_readv, |
5a41e1fa | 787 | .bdrv_co_writev = parallels_co_writev, |
74cf6c50 DL |
788 | |
789 | .bdrv_create = parallels_create, | |
49ad6467 | 790 | .bdrv_check = parallels_check, |
74cf6c50 | 791 | .create_opts = ¶llels_create_opts, |
6ada7453 | 792 | }; |
5efa9d5a AL |
793 | |
794 | static void bdrv_parallels_init(void) | |
795 | { | |
796 | bdrv_register(&bdrv_parallels); | |
797 | } | |
798 | ||
799 | block_init(bdrv_parallels_init); |