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