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88ddffae VSO |
1 | /* |
2 | * Bitmaps for the QCOW version 2 format | |
3 | * | |
4 | * Copyright (c) 2014-2017 Vladimir Sementsov-Ogievskiy | |
5 | * | |
6 | * This file is derived from qcow2-snapshot.c, original copyright: | |
7 | * Copyright (c) 2004-2006 Fabrice Bellard | |
8 | * | |
9 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
10 | * of this software and associated documentation files (the "Software"), to deal | |
11 | * in the Software without restriction, including without limitation the rights | |
12 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
13 | * copies of the Software, and to permit persons to whom the Software is | |
14 | * furnished to do so, subject to the following conditions: | |
15 | * | |
16 | * The above copyright notice and this permission notice shall be included in | |
17 | * all copies or substantial portions of the Software. | |
18 | * | |
19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
22 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
23 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
24 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
25 | * THE SOFTWARE. | |
26 | */ | |
27 | ||
28 | #include "qemu/osdep.h" | |
e2c1c34f MA |
29 | #include "block/block-io.h" |
30 | #include "block/dirty-bitmap.h" | |
88ddffae | 31 | #include "qapi/error.h" |
5f72826e | 32 | #include "qemu/cutils.h" |
88ddffae | 33 | |
0d8c41da | 34 | #include "qcow2.h" |
88ddffae VSO |
35 | |
36 | /* NOTICE: BME here means Bitmaps Extension and used as a namespace for | |
37 | * _internal_ constants. Please do not use this _internal_ abbreviation for | |
38 | * other needs and/or outside of this file. */ | |
39 | ||
40 | /* Bitmap directory entry constraints */ | |
41 | #define BME_MAX_TABLE_SIZE 0x8000000 | |
42 | #define BME_MAX_PHYS_SIZE 0x20000000 /* restrict BdrvDirtyBitmap size in RAM */ | |
43 | #define BME_MAX_GRANULARITY_BITS 31 | |
44 | #define BME_MIN_GRANULARITY_BITS 9 | |
45 | #define BME_MAX_NAME_SIZE 1023 | |
46 | ||
02b1ecfa AG |
47 | /* Size of bitmap table entries */ |
48 | #define BME_TABLE_ENTRY_SIZE (sizeof(uint64_t)) | |
49 | ||
cf7c49cf EB |
50 | QEMU_BUILD_BUG_ON(BME_MAX_NAME_SIZE != BDRV_BITMAP_MAX_NAME_SIZE); |
51 | ||
5f72826e VSO |
52 | #if BME_MAX_TABLE_SIZE * 8ULL > INT_MAX |
53 | #error In the code bitmap table physical size assumed to fit into int | |
54 | #endif | |
55 | ||
88ddffae VSO |
56 | /* Bitmap directory entry flags */ |
57 | #define BME_RESERVED_FLAGS 0xfffffffcU | |
d1258dd0 VSO |
58 | #define BME_FLAG_IN_USE (1U << 0) |
59 | #define BME_FLAG_AUTO (1U << 1) | |
88ddffae VSO |
60 | |
61 | /* bits [1, 8] U [56, 63] are reserved */ | |
62 | #define BME_TABLE_ENTRY_RESERVED_MASK 0xff000000000001feULL | |
63 | #define BME_TABLE_ENTRY_OFFSET_MASK 0x00fffffffffffe00ULL | |
64 | #define BME_TABLE_ENTRY_FLAG_ALL_ONES (1ULL << 0) | |
65 | ||
66 | typedef struct QEMU_PACKED Qcow2BitmapDirEntry { | |
67 | /* header is 8 byte aligned */ | |
68 | uint64_t bitmap_table_offset; | |
69 | ||
70 | uint32_t bitmap_table_size; | |
71 | uint32_t flags; | |
72 | ||
73 | uint8_t type; | |
74 | uint8_t granularity_bits; | |
75 | uint16_t name_size; | |
76 | uint32_t extra_data_size; | |
77 | /* extra data follows */ | |
78 | /* name follows */ | |
79 | } Qcow2BitmapDirEntry; | |
80 | ||
81 | typedef struct Qcow2BitmapTable { | |
82 | uint64_t offset; | |
83 | uint32_t size; /* number of 64bit entries */ | |
84 | QSIMPLEQ_ENTRY(Qcow2BitmapTable) entry; | |
85 | } Qcow2BitmapTable; | |
86 | ||
87 | typedef struct Qcow2Bitmap { | |
88 | Qcow2BitmapTable table; | |
89 | uint32_t flags; | |
90 | uint8_t granularity_bits; | |
91 | char *name; | |
92 | ||
5f72826e VSO |
93 | BdrvDirtyBitmap *dirty_bitmap; |
94 | ||
88ddffae VSO |
95 | QSIMPLEQ_ENTRY(Qcow2Bitmap) entry; |
96 | } Qcow2Bitmap; | |
97 | typedef QSIMPLEQ_HEAD(Qcow2BitmapList, Qcow2Bitmap) Qcow2BitmapList; | |
98 | ||
99 | typedef enum BitmapType { | |
100 | BT_DIRTY_TRACKING_BITMAP = 1 | |
101 | } BitmapType; | |
102 | ||
d1258dd0 VSO |
103 | static inline bool can_write(BlockDriverState *bs) |
104 | { | |
105 | return !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE); | |
106 | } | |
107 | ||
108 | static int update_header_sync(BlockDriverState *bs) | |
109 | { | |
110 | int ret; | |
111 | ||
112 | ret = qcow2_update_header(bs); | |
113 | if (ret < 0) { | |
114 | return ret; | |
115 | } | |
116 | ||
1a0c2bfb | 117 | return bdrv_flush(bs->file->bs); |
d1258dd0 VSO |
118 | } |
119 | ||
b03dd961 | 120 | static inline void bitmap_table_bswap_be(uint64_t *bitmap_table, size_t size) |
5f72826e VSO |
121 | { |
122 | size_t i; | |
123 | ||
124 | for (i = 0; i < size; ++i) { | |
caacea4b | 125 | bitmap_table[i] = cpu_to_be64(bitmap_table[i]); |
5f72826e VSO |
126 | } |
127 | } | |
128 | ||
88ddffae VSO |
129 | static int check_table_entry(uint64_t entry, int cluster_size) |
130 | { | |
131 | uint64_t offset; | |
132 | ||
133 | if (entry & BME_TABLE_ENTRY_RESERVED_MASK) { | |
134 | return -EINVAL; | |
135 | } | |
136 | ||
137 | offset = entry & BME_TABLE_ENTRY_OFFSET_MASK; | |
138 | if (offset != 0) { | |
139 | /* if offset specified, bit 0 is reserved */ | |
140 | if (entry & BME_TABLE_ENTRY_FLAG_ALL_ONES) { | |
141 | return -EINVAL; | |
142 | } | |
143 | ||
144 | if (offset % cluster_size != 0) { | |
145 | return -EINVAL; | |
146 | } | |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
570542ec T |
152 | static int64_t get_bitmap_bytes_needed(int64_t len, uint32_t granularity) |
153 | { | |
154 | int64_t num_bits = DIV_ROUND_UP(len, granularity); | |
155 | ||
156 | return DIV_ROUND_UP(num_bits, 8); | |
157 | } | |
158 | ||
5f72826e VSO |
159 | static int check_constraints_on_bitmap(BlockDriverState *bs, |
160 | const char *name, | |
161 | uint32_t granularity, | |
162 | Error **errp) | |
163 | { | |
164 | BDRVQcow2State *s = bs->opaque; | |
165 | int granularity_bits = ctz32(granularity); | |
166 | int64_t len = bdrv_getlength(bs); | |
570542ec | 167 | int64_t bitmap_bytes; |
5f72826e VSO |
168 | |
169 | assert(granularity > 0); | |
170 | assert((granularity & (granularity - 1)) == 0); | |
171 | ||
172 | if (len < 0) { | |
173 | error_setg_errno(errp, -len, "Failed to get size of '%s'", | |
174 | bdrv_get_device_or_node_name(bs)); | |
175 | return len; | |
176 | } | |
177 | ||
178 | if (granularity_bits > BME_MAX_GRANULARITY_BITS) { | |
179 | error_setg(errp, "Granularity exceeds maximum (%llu bytes)", | |
180 | 1ULL << BME_MAX_GRANULARITY_BITS); | |
181 | return -EINVAL; | |
182 | } | |
183 | if (granularity_bits < BME_MIN_GRANULARITY_BITS) { | |
184 | error_setg(errp, "Granularity is under minimum (%llu bytes)", | |
185 | 1ULL << BME_MIN_GRANULARITY_BITS); | |
186 | return -EINVAL; | |
187 | } | |
188 | ||
570542ec T |
189 | bitmap_bytes = get_bitmap_bytes_needed(len, granularity); |
190 | if ((bitmap_bytes > (uint64_t)BME_MAX_PHYS_SIZE) || | |
191 | (bitmap_bytes > (uint64_t)BME_MAX_TABLE_SIZE * s->cluster_size)) | |
5f72826e VSO |
192 | { |
193 | error_setg(errp, "Too much space will be occupied by the bitmap. " | |
194 | "Use larger granularity"); | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | if (strlen(name) > BME_MAX_NAME_SIZE) { | |
199 | error_setg(errp, "Name length exceeds maximum (%u characters)", | |
200 | BME_MAX_NAME_SIZE); | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static void clear_bitmap_table(BlockDriverState *bs, uint64_t *bitmap_table, | |
208 | uint32_t bitmap_table_size) | |
209 | { | |
210 | BDRVQcow2State *s = bs->opaque; | |
211 | int i; | |
212 | ||
213 | for (i = 0; i < bitmap_table_size; ++i) { | |
214 | uint64_t addr = bitmap_table[i] & BME_TABLE_ENTRY_OFFSET_MASK; | |
215 | if (!addr) { | |
216 | continue; | |
217 | } | |
218 | ||
444b8236 | 219 | qcow2_free_clusters(bs, addr, s->cluster_size, QCOW2_DISCARD_ALWAYS); |
5f72826e VSO |
220 | bitmap_table[i] = 0; |
221 | } | |
222 | } | |
223 | ||
88ddffae VSO |
224 | static int bitmap_table_load(BlockDriverState *bs, Qcow2BitmapTable *tb, |
225 | uint64_t **bitmap_table) | |
226 | { | |
227 | int ret; | |
228 | BDRVQcow2State *s = bs->opaque; | |
229 | uint32_t i; | |
230 | uint64_t *table; | |
231 | ||
232 | assert(tb->size != 0); | |
233 | table = g_try_new(uint64_t, tb->size); | |
234 | if (table == NULL) { | |
235 | return -ENOMEM; | |
236 | } | |
237 | ||
238 | assert(tb->size <= BME_MAX_TABLE_SIZE); | |
32cc71de AF |
239 | ret = bdrv_pread(bs->file, tb->offset, tb->size * BME_TABLE_ENTRY_SIZE, |
240 | table, 0); | |
88ddffae VSO |
241 | if (ret < 0) { |
242 | goto fail; | |
243 | } | |
244 | ||
245 | for (i = 0; i < tb->size; ++i) { | |
caacea4b | 246 | table[i] = be64_to_cpu(table[i]); |
88ddffae VSO |
247 | ret = check_table_entry(table[i], s->cluster_size); |
248 | if (ret < 0) { | |
249 | goto fail; | |
250 | } | |
251 | } | |
252 | ||
253 | *bitmap_table = table; | |
254 | return 0; | |
255 | ||
256 | fail: | |
257 | g_free(table); | |
258 | ||
259 | return ret; | |
260 | } | |
261 | ||
5f72826e VSO |
262 | static int free_bitmap_clusters(BlockDriverState *bs, Qcow2BitmapTable *tb) |
263 | { | |
264 | int ret; | |
265 | uint64_t *bitmap_table; | |
266 | ||
267 | ret = bitmap_table_load(bs, tb, &bitmap_table); | |
268 | if (ret < 0) { | |
5f72826e VSO |
269 | return ret; |
270 | } | |
271 | ||
272 | clear_bitmap_table(bs, bitmap_table, tb->size); | |
02b1ecfa | 273 | qcow2_free_clusters(bs, tb->offset, tb->size * BME_TABLE_ENTRY_SIZE, |
5f72826e VSO |
274 | QCOW2_DISCARD_OTHER); |
275 | g_free(bitmap_table); | |
276 | ||
277 | tb->offset = 0; | |
278 | tb->size = 0; | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
d1258dd0 VSO |
283 | /* load_bitmap_data |
284 | * @bitmap_table entries must satisfy specification constraints. | |
285 | * @bitmap must be cleared */ | |
70bacc44 PB |
286 | static int coroutine_fn GRAPH_RDLOCK |
287 | load_bitmap_data(BlockDriverState *bs, const uint64_t *bitmap_table, | |
288 | uint32_t bitmap_table_size, BdrvDirtyBitmap *bitmap) | |
d1258dd0 VSO |
289 | { |
290 | int ret = 0; | |
291 | BDRVQcow2State *s = bs->opaque; | |
ab94db6f | 292 | uint64_t offset, limit; |
d1258dd0 VSO |
293 | uint64_t bm_size = bdrv_dirty_bitmap_size(bitmap); |
294 | uint8_t *buf = NULL; | |
295 | uint64_t i, tab_size = | |
296 | size_to_clusters(s, | |
86f6ae67 | 297 | bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_size)); |
d1258dd0 VSO |
298 | |
299 | if (tab_size != bitmap_table_size || tab_size > BME_MAX_TABLE_SIZE) { | |
300 | return -EINVAL; | |
301 | } | |
302 | ||
303 | buf = g_malloc(s->cluster_size); | |
35f428ba | 304 | limit = bdrv_dirty_bitmap_serialization_coverage(s->cluster_size, bitmap); |
ab94db6f EB |
305 | for (i = 0, offset = 0; i < tab_size; ++i, offset += limit) { |
306 | uint64_t count = MIN(bm_size - offset, limit); | |
d1258dd0 | 307 | uint64_t entry = bitmap_table[i]; |
ab94db6f | 308 | uint64_t data_offset = entry & BME_TABLE_ENTRY_OFFSET_MASK; |
d1258dd0 VSO |
309 | |
310 | assert(check_table_entry(entry, s->cluster_size) == 0); | |
311 | ||
ab94db6f | 312 | if (data_offset == 0) { |
d1258dd0 | 313 | if (entry & BME_TABLE_ENTRY_FLAG_ALL_ONES) { |
ab94db6f | 314 | bdrv_dirty_bitmap_deserialize_ones(bitmap, offset, count, |
d1258dd0 VSO |
315 | false); |
316 | } else { | |
317 | /* No need to deserialize zeros because the dirty bitmap is | |
318 | * already cleared */ | |
319 | } | |
320 | } else { | |
70bacc44 | 321 | ret = bdrv_co_pread(bs->file, data_offset, s->cluster_size, buf, 0); |
d1258dd0 VSO |
322 | if (ret < 0) { |
323 | goto finish; | |
324 | } | |
ab94db6f | 325 | bdrv_dirty_bitmap_deserialize_part(bitmap, buf, offset, count, |
d1258dd0 VSO |
326 | false); |
327 | } | |
328 | } | |
329 | ret = 0; | |
330 | ||
331 | bdrv_dirty_bitmap_deserialize_finish(bitmap); | |
332 | ||
333 | finish: | |
334 | g_free(buf); | |
335 | ||
336 | return ret; | |
337 | } | |
338 | ||
70bacc44 PB |
339 | static coroutine_fn GRAPH_RDLOCK |
340 | BdrvDirtyBitmap *load_bitmap(BlockDriverState *bs, | |
341 | Qcow2Bitmap *bm, Error **errp) | |
d1258dd0 VSO |
342 | { |
343 | int ret; | |
344 | uint64_t *bitmap_table = NULL; | |
345 | uint32_t granularity; | |
346 | BdrvDirtyBitmap *bitmap = NULL; | |
347 | ||
74da6b94 JS |
348 | granularity = 1U << bm->granularity_bits; |
349 | bitmap = bdrv_create_dirty_bitmap(bs, granularity, bm->name, errp); | |
350 | if (bitmap == NULL) { | |
d1258dd0 VSO |
351 | goto fail; |
352 | } | |
353 | ||
74da6b94 JS |
354 | if (bm->flags & BME_FLAG_IN_USE) { |
355 | /* Data is unusable, skip loading it */ | |
356 | return bitmap; | |
357 | } | |
358 | ||
d1258dd0 VSO |
359 | ret = bitmap_table_load(bs, &bm->table, &bitmap_table); |
360 | if (ret < 0) { | |
361 | error_setg_errno(errp, -ret, | |
362 | "Could not read bitmap_table table from image for " | |
363 | "bitmap '%s'", bm->name); | |
364 | goto fail; | |
365 | } | |
366 | ||
d1258dd0 VSO |
367 | ret = load_bitmap_data(bs, bitmap_table, bm->table.size, bitmap); |
368 | if (ret < 0) { | |
369 | error_setg_errno(errp, -ret, "Could not read bitmap '%s' from image", | |
370 | bm->name); | |
371 | goto fail; | |
372 | } | |
373 | ||
374 | g_free(bitmap_table); | |
375 | return bitmap; | |
376 | ||
377 | fail: | |
378 | g_free(bitmap_table); | |
379 | if (bitmap != NULL) { | |
5deb6cbd | 380 | bdrv_release_dirty_bitmap(bitmap); |
d1258dd0 VSO |
381 | } |
382 | ||
383 | return NULL; | |
384 | } | |
385 | ||
88ddffae VSO |
386 | /* |
387 | * Bitmap List | |
388 | */ | |
389 | ||
390 | /* | |
391 | * Bitmap List private functions | |
392 | * Only Bitmap List knows about bitmap directory structure in Qcow2. | |
393 | */ | |
394 | ||
395 | static inline void bitmap_dir_entry_to_cpu(Qcow2BitmapDirEntry *entry) | |
396 | { | |
caacea4b PM |
397 | entry->bitmap_table_offset = be64_to_cpu(entry->bitmap_table_offset); |
398 | entry->bitmap_table_size = be32_to_cpu(entry->bitmap_table_size); | |
399 | entry->flags = be32_to_cpu(entry->flags); | |
400 | entry->name_size = be16_to_cpu(entry->name_size); | |
401 | entry->extra_data_size = be32_to_cpu(entry->extra_data_size); | |
88ddffae VSO |
402 | } |
403 | ||
d1258dd0 VSO |
404 | static inline void bitmap_dir_entry_to_be(Qcow2BitmapDirEntry *entry) |
405 | { | |
caacea4b PM |
406 | entry->bitmap_table_offset = cpu_to_be64(entry->bitmap_table_offset); |
407 | entry->bitmap_table_size = cpu_to_be32(entry->bitmap_table_size); | |
408 | entry->flags = cpu_to_be32(entry->flags); | |
409 | entry->name_size = cpu_to_be16(entry->name_size); | |
410 | entry->extra_data_size = cpu_to_be32(entry->extra_data_size); | |
d1258dd0 VSO |
411 | } |
412 | ||
88ddffae VSO |
413 | static inline int calc_dir_entry_size(size_t name_size, size_t extra_data_size) |
414 | { | |
9e029689 AG |
415 | int size = sizeof(Qcow2BitmapDirEntry) + name_size + extra_data_size; |
416 | return ROUND_UP(size, 8); | |
88ddffae VSO |
417 | } |
418 | ||
419 | static inline int dir_entry_size(Qcow2BitmapDirEntry *entry) | |
420 | { | |
421 | return calc_dir_entry_size(entry->name_size, entry->extra_data_size); | |
422 | } | |
423 | ||
424 | static inline const char *dir_entry_name_field(Qcow2BitmapDirEntry *entry) | |
425 | { | |
426 | return (const char *)(entry + 1) + entry->extra_data_size; | |
427 | } | |
428 | ||
429 | static inline char *dir_entry_copy_name(Qcow2BitmapDirEntry *entry) | |
430 | { | |
431 | const char *name_field = dir_entry_name_field(entry); | |
432 | return g_strndup(name_field, entry->name_size); | |
433 | } | |
434 | ||
435 | static inline Qcow2BitmapDirEntry *next_dir_entry(Qcow2BitmapDirEntry *entry) | |
436 | { | |
437 | return (Qcow2BitmapDirEntry *)((uint8_t *)entry + dir_entry_size(entry)); | |
438 | } | |
439 | ||
440 | static int check_dir_entry(BlockDriverState *bs, Qcow2BitmapDirEntry *entry) | |
441 | { | |
442 | BDRVQcow2State *s = bs->opaque; | |
443 | uint64_t phys_bitmap_bytes; | |
444 | int64_t len; | |
445 | ||
446 | bool fail = (entry->bitmap_table_size == 0) || | |
447 | (entry->bitmap_table_offset == 0) || | |
448 | (entry->bitmap_table_offset % s->cluster_size) || | |
449 | (entry->bitmap_table_size > BME_MAX_TABLE_SIZE) || | |
450 | (entry->granularity_bits > BME_MAX_GRANULARITY_BITS) || | |
451 | (entry->granularity_bits < BME_MIN_GRANULARITY_BITS) || | |
452 | (entry->flags & BME_RESERVED_FLAGS) || | |
453 | (entry->name_size > BME_MAX_NAME_SIZE) || | |
454 | (entry->type != BT_DIRTY_TRACKING_BITMAP); | |
455 | ||
456 | if (fail) { | |
457 | return -EINVAL; | |
458 | } | |
459 | ||
460 | phys_bitmap_bytes = (uint64_t)entry->bitmap_table_size * s->cluster_size; | |
461 | len = bdrv_getlength(bs); | |
462 | ||
463 | if (len < 0) { | |
464 | return len; | |
465 | } | |
466 | ||
bf5f0cf5 VSO |
467 | if (phys_bitmap_bytes > BME_MAX_PHYS_SIZE) { |
468 | return -EINVAL; | |
469 | } | |
88ddffae | 470 | |
bf5f0cf5 VSO |
471 | if (!(entry->flags & BME_FLAG_IN_USE) && |
472 | (len > ((phys_bitmap_bytes * 8) << entry->granularity_bits))) | |
473 | { | |
474 | /* | |
475 | * We've loaded a valid bitmap (IN_USE not set) or we are going to | |
476 | * store a valid bitmap, but the allocated bitmap table size is not | |
477 | * enough to store this bitmap. | |
478 | * | |
479 | * Note, that it's OK to have an invalid bitmap with invalid size due | |
480 | * to a bitmap that was not correctly saved after image resize. | |
481 | */ | |
482 | return -EINVAL; | |
483 | } | |
484 | ||
485 | return 0; | |
88ddffae VSO |
486 | } |
487 | ||
d1258dd0 VSO |
488 | static inline void bitmap_directory_to_be(uint8_t *dir, size_t size) |
489 | { | |
490 | uint8_t *end = dir + size; | |
491 | while (dir < end) { | |
492 | Qcow2BitmapDirEntry *e = (Qcow2BitmapDirEntry *)dir; | |
493 | dir += dir_entry_size(e); | |
494 | ||
495 | bitmap_dir_entry_to_be(e); | |
496 | } | |
497 | } | |
498 | ||
88ddffae VSO |
499 | /* |
500 | * Bitmap List public functions | |
501 | */ | |
502 | ||
503 | static void bitmap_free(Qcow2Bitmap *bm) | |
504 | { | |
b6b75a99 VSO |
505 | if (bm == NULL) { |
506 | return; | |
507 | } | |
508 | ||
88ddffae VSO |
509 | g_free(bm->name); |
510 | g_free(bm); | |
511 | } | |
512 | ||
513 | static void bitmap_list_free(Qcow2BitmapList *bm_list) | |
514 | { | |
515 | Qcow2Bitmap *bm; | |
516 | ||
517 | if (bm_list == NULL) { | |
518 | return; | |
519 | } | |
520 | ||
521 | while ((bm = QSIMPLEQ_FIRST(bm_list)) != NULL) { | |
522 | QSIMPLEQ_REMOVE_HEAD(bm_list, entry); | |
523 | bitmap_free(bm); | |
524 | } | |
525 | ||
526 | g_free(bm_list); | |
527 | } | |
528 | ||
529 | static Qcow2BitmapList *bitmap_list_new(void) | |
530 | { | |
531 | Qcow2BitmapList *bm_list = g_new(Qcow2BitmapList, 1); | |
532 | QSIMPLEQ_INIT(bm_list); | |
533 | ||
534 | return bm_list; | |
535 | } | |
536 | ||
d1258dd0 VSO |
537 | static uint32_t bitmap_list_count(Qcow2BitmapList *bm_list) |
538 | { | |
539 | Qcow2Bitmap *bm; | |
540 | uint32_t nb_bitmaps = 0; | |
541 | ||
542 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
543 | nb_bitmaps++; | |
544 | } | |
545 | ||
546 | return nb_bitmaps; | |
547 | } | |
548 | ||
88ddffae VSO |
549 | /* bitmap_list_load |
550 | * Get bitmap list from qcow2 image. Actually reads bitmap directory, | |
551 | * checks it and convert to bitmap list. | |
552 | */ | |
553 | static Qcow2BitmapList *bitmap_list_load(BlockDriverState *bs, uint64_t offset, | |
554 | uint64_t size, Error **errp) | |
555 | { | |
556 | int ret; | |
557 | BDRVQcow2State *s = bs->opaque; | |
558 | uint8_t *dir, *dir_end; | |
559 | Qcow2BitmapDirEntry *e; | |
560 | uint32_t nb_dir_entries = 0; | |
561 | Qcow2BitmapList *bm_list = NULL; | |
562 | ||
563 | if (size == 0) { | |
564 | error_setg(errp, "Requested bitmap directory size is zero"); | |
565 | return NULL; | |
566 | } | |
567 | ||
568 | if (size > QCOW2_MAX_BITMAP_DIRECTORY_SIZE) { | |
569 | error_setg(errp, "Requested bitmap directory size is too big"); | |
570 | return NULL; | |
571 | } | |
572 | ||
573 | dir = g_try_malloc(size); | |
574 | if (dir == NULL) { | |
575 | error_setg(errp, "Failed to allocate space for bitmap directory"); | |
576 | return NULL; | |
577 | } | |
578 | dir_end = dir + size; | |
579 | ||
32cc71de | 580 | ret = bdrv_pread(bs->file, offset, size, dir, 0); |
88ddffae VSO |
581 | if (ret < 0) { |
582 | error_setg_errno(errp, -ret, "Failed to read bitmap directory"); | |
583 | goto fail; | |
584 | } | |
585 | ||
586 | bm_list = bitmap_list_new(); | |
587 | for (e = (Qcow2BitmapDirEntry *)dir; | |
588 | e < (Qcow2BitmapDirEntry *)dir_end; | |
589 | e = next_dir_entry(e)) | |
590 | { | |
591 | Qcow2Bitmap *bm; | |
592 | ||
593 | if ((uint8_t *)(e + 1) > dir_end) { | |
594 | goto broken_dir; | |
595 | } | |
596 | ||
597 | if (++nb_dir_entries > s->nb_bitmaps) { | |
598 | error_setg(errp, "More bitmaps found than specified in header" | |
599 | " extension"); | |
600 | goto fail; | |
601 | } | |
602 | bitmap_dir_entry_to_cpu(e); | |
603 | ||
604 | if ((uint8_t *)next_dir_entry(e) > dir_end) { | |
605 | goto broken_dir; | |
606 | } | |
607 | ||
608 | if (e->extra_data_size != 0) { | |
609 | error_setg(errp, "Bitmap extra data is not supported"); | |
610 | goto fail; | |
611 | } | |
612 | ||
613 | ret = check_dir_entry(bs, e); | |
614 | if (ret < 0) { | |
615 | error_setg(errp, "Bitmap '%.*s' doesn't satisfy the constraints", | |
616 | e->name_size, dir_entry_name_field(e)); | |
617 | goto fail; | |
618 | } | |
619 | ||
5330f32b | 620 | bm = g_new0(Qcow2Bitmap, 1); |
88ddffae VSO |
621 | bm->table.offset = e->bitmap_table_offset; |
622 | bm->table.size = e->bitmap_table_size; | |
623 | bm->flags = e->flags; | |
624 | bm->granularity_bits = e->granularity_bits; | |
625 | bm->name = dir_entry_copy_name(e); | |
626 | QSIMPLEQ_INSERT_TAIL(bm_list, bm, entry); | |
627 | } | |
628 | ||
629 | if (nb_dir_entries != s->nb_bitmaps) { | |
630 | error_setg(errp, "Less bitmaps found than specified in header" | |
631 | " extension"); | |
632 | goto fail; | |
633 | } | |
634 | ||
635 | if ((uint8_t *)e != dir_end) { | |
636 | goto broken_dir; | |
637 | } | |
638 | ||
639 | g_free(dir); | |
640 | return bm_list; | |
641 | ||
642 | broken_dir: | |
88ddffae VSO |
643 | error_setg(errp, "Broken bitmap directory"); |
644 | ||
645 | fail: | |
646 | g_free(dir); | |
647 | bitmap_list_free(bm_list); | |
648 | ||
649 | return NULL; | |
650 | } | |
651 | ||
70bacc44 PB |
652 | int coroutine_fn |
653 | qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res, | |
654 | void **refcount_table, | |
655 | int64_t *refcount_table_size) | |
88ddffae VSO |
656 | { |
657 | int ret; | |
658 | BDRVQcow2State *s = bs->opaque; | |
659 | Qcow2BitmapList *bm_list; | |
660 | Qcow2Bitmap *bm; | |
661 | ||
662 | if (s->nb_bitmaps == 0) { | |
663 | return 0; | |
664 | } | |
665 | ||
666 | ret = qcow2_inc_refcounts_imrt(bs, res, refcount_table, refcount_table_size, | |
667 | s->bitmap_directory_offset, | |
668 | s->bitmap_directory_size); | |
669 | if (ret < 0) { | |
670 | return ret; | |
671 | } | |
672 | ||
673 | bm_list = bitmap_list_load(bs, s->bitmap_directory_offset, | |
674 | s->bitmap_directory_size, NULL); | |
675 | if (bm_list == NULL) { | |
676 | res->corruptions++; | |
677 | return -EINVAL; | |
678 | } | |
679 | ||
680 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
681 | uint64_t *bitmap_table = NULL; | |
682 | int i; | |
683 | ||
684 | ret = qcow2_inc_refcounts_imrt(bs, res, | |
685 | refcount_table, refcount_table_size, | |
686 | bm->table.offset, | |
02b1ecfa | 687 | bm->table.size * BME_TABLE_ENTRY_SIZE); |
88ddffae VSO |
688 | if (ret < 0) { |
689 | goto out; | |
690 | } | |
691 | ||
692 | ret = bitmap_table_load(bs, &bm->table, &bitmap_table); | |
693 | if (ret < 0) { | |
694 | res->corruptions++; | |
695 | goto out; | |
696 | } | |
697 | ||
698 | for (i = 0; i < bm->table.size; ++i) { | |
699 | uint64_t entry = bitmap_table[i]; | |
700 | uint64_t offset = entry & BME_TABLE_ENTRY_OFFSET_MASK; | |
701 | ||
702 | if (check_table_entry(entry, s->cluster_size) < 0) { | |
703 | res->corruptions++; | |
704 | continue; | |
705 | } | |
706 | ||
707 | if (offset == 0) { | |
708 | continue; | |
709 | } | |
710 | ||
711 | ret = qcow2_inc_refcounts_imrt(bs, res, | |
712 | refcount_table, refcount_table_size, | |
713 | offset, s->cluster_size); | |
714 | if (ret < 0) { | |
715 | g_free(bitmap_table); | |
716 | goto out; | |
717 | } | |
718 | } | |
719 | ||
720 | g_free(bitmap_table); | |
721 | } | |
722 | ||
723 | out: | |
724 | bitmap_list_free(bm_list); | |
725 | ||
726 | return ret; | |
727 | } | |
d1258dd0 VSO |
728 | |
729 | /* bitmap_list_store | |
730 | * Store bitmap list to qcow2 image as a bitmap directory. | |
731 | * Everything is checked. | |
732 | */ | |
733 | static int bitmap_list_store(BlockDriverState *bs, Qcow2BitmapList *bm_list, | |
734 | uint64_t *offset, uint64_t *size, bool in_place) | |
735 | { | |
736 | int ret; | |
737 | uint8_t *dir; | |
738 | int64_t dir_offset = 0; | |
739 | uint64_t dir_size = 0; | |
740 | Qcow2Bitmap *bm; | |
741 | Qcow2BitmapDirEntry *e; | |
742 | ||
743 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
744 | dir_size += calc_dir_entry_size(strlen(bm->name), 0); | |
745 | } | |
746 | ||
747 | if (dir_size == 0 || dir_size > QCOW2_MAX_BITMAP_DIRECTORY_SIZE) { | |
748 | return -EINVAL; | |
749 | } | |
750 | ||
751 | if (in_place) { | |
752 | if (*size != dir_size || *offset == 0) { | |
753 | return -EINVAL; | |
754 | } | |
755 | ||
756 | dir_offset = *offset; | |
757 | } | |
758 | ||
6388903e | 759 | dir = g_try_malloc0(dir_size); |
d1258dd0 VSO |
760 | if (dir == NULL) { |
761 | return -ENOMEM; | |
762 | } | |
763 | ||
764 | e = (Qcow2BitmapDirEntry *)dir; | |
765 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
766 | e->bitmap_table_offset = bm->table.offset; | |
767 | e->bitmap_table_size = bm->table.size; | |
768 | e->flags = bm->flags; | |
769 | e->type = BT_DIRTY_TRACKING_BITMAP; | |
770 | e->granularity_bits = bm->granularity_bits; | |
771 | e->name_size = strlen(bm->name); | |
772 | e->extra_data_size = 0; | |
773 | memcpy(e + 1, bm->name, e->name_size); | |
774 | ||
775 | if (check_dir_entry(bs, e) < 0) { | |
776 | ret = -EINVAL; | |
777 | goto fail; | |
778 | } | |
779 | ||
780 | e = next_dir_entry(e); | |
781 | } | |
782 | ||
783 | bitmap_directory_to_be(dir, dir_size); | |
784 | ||
785 | if (!in_place) { | |
786 | dir_offset = qcow2_alloc_clusters(bs, dir_size); | |
787 | if (dir_offset < 0) { | |
788 | ret = dir_offset; | |
789 | goto fail; | |
790 | } | |
791 | } | |
792 | ||
7a21bee2 DB |
793 | /* Actually, even in the in-place case ignoring QCOW2_OL_BITMAP_DIRECTORY |
794 | * is not necessary, because we drop QCOW2_AUTOCLEAR_BITMAPS when updating | |
795 | * bitmap directory in-place (actually, turn-off the extension), which is | |
796 | * checked in qcow2_check_metadata_overlap() */ | |
0e4e4318 | 797 | ret = qcow2_pre_write_overlap_check( |
966b000f KW |
798 | bs, in_place ? QCOW2_OL_BITMAP_DIRECTORY : 0, dir_offset, dir_size, |
799 | false); | |
d1258dd0 VSO |
800 | if (ret < 0) { |
801 | goto fail; | |
802 | } | |
803 | ||
32cc71de | 804 | ret = bdrv_pwrite(bs->file, dir_offset, dir_size, dir, 0); |
d1258dd0 VSO |
805 | if (ret < 0) { |
806 | goto fail; | |
807 | } | |
808 | ||
809 | g_free(dir); | |
810 | ||
811 | if (!in_place) { | |
812 | *size = dir_size; | |
813 | *offset = dir_offset; | |
814 | } | |
815 | ||
816 | return 0; | |
817 | ||
818 | fail: | |
819 | g_free(dir); | |
820 | ||
821 | if (!in_place && dir_offset > 0) { | |
822 | qcow2_free_clusters(bs, dir_offset, dir_size, QCOW2_DISCARD_OTHER); | |
823 | } | |
824 | ||
825 | return ret; | |
826 | } | |
827 | ||
828 | /* | |
829 | * Bitmap List end | |
830 | */ | |
831 | ||
832 | static int update_ext_header_and_dir_in_place(BlockDriverState *bs, | |
833 | Qcow2BitmapList *bm_list) | |
834 | { | |
835 | BDRVQcow2State *s = bs->opaque; | |
836 | int ret; | |
837 | ||
838 | if (!(s->autoclear_features & QCOW2_AUTOCLEAR_BITMAPS) || | |
839 | bm_list == NULL || QSIMPLEQ_EMPTY(bm_list) || | |
840 | bitmap_list_count(bm_list) != s->nb_bitmaps) | |
841 | { | |
842 | return -EINVAL; | |
843 | } | |
844 | ||
845 | s->autoclear_features &= ~(uint64_t)QCOW2_AUTOCLEAR_BITMAPS; | |
846 | ret = update_header_sync(bs); | |
847 | if (ret < 0) { | |
848 | /* Two variants are possible here: | |
849 | * 1. Autoclear flag is dropped, all bitmaps will be lost. | |
850 | * 2. Autoclear flag is not dropped, old state is left. | |
851 | */ | |
852 | return ret; | |
853 | } | |
854 | ||
855 | /* autoclear bit is not set, so we can safely update bitmap directory */ | |
856 | ||
857 | ret = bitmap_list_store(bs, bm_list, &s->bitmap_directory_offset, | |
858 | &s->bitmap_directory_size, true); | |
859 | if (ret < 0) { | |
860 | /* autoclear bit is cleared, so all leaked clusters would be removed on | |
861 | * qemu-img check */ | |
862 | return ret; | |
863 | } | |
864 | ||
865 | ret = update_header_sync(bs); | |
866 | if (ret < 0) { | |
867 | /* autoclear bit is cleared, so all leaked clusters would be removed on | |
868 | * qemu-img check */ | |
869 | return ret; | |
870 | } | |
871 | ||
872 | s->autoclear_features |= QCOW2_AUTOCLEAR_BITMAPS; | |
873 | return update_header_sync(bs); | |
874 | /* If final update_header_sync() fails, two variants are possible: | |
875 | * 1. Autoclear flag is not set, all bitmaps will be lost. | |
876 | * 2. Autoclear flag is set, header and directory are successfully updated. | |
877 | */ | |
878 | } | |
879 | ||
5f72826e VSO |
880 | static int update_ext_header_and_dir(BlockDriverState *bs, |
881 | Qcow2BitmapList *bm_list) | |
882 | { | |
883 | BDRVQcow2State *s = bs->opaque; | |
884 | int ret; | |
885 | uint64_t new_offset = 0; | |
886 | uint64_t new_size = 0; | |
887 | uint32_t new_nb_bitmaps = 0; | |
888 | uint64_t old_offset = s->bitmap_directory_offset; | |
889 | uint64_t old_size = s->bitmap_directory_size; | |
890 | uint32_t old_nb_bitmaps = s->nb_bitmaps; | |
891 | uint64_t old_autocl = s->autoclear_features; | |
892 | ||
893 | if (bm_list != NULL && !QSIMPLEQ_EMPTY(bm_list)) { | |
894 | new_nb_bitmaps = bitmap_list_count(bm_list); | |
895 | ||
896 | if (new_nb_bitmaps > QCOW2_MAX_BITMAPS) { | |
897 | return -EINVAL; | |
898 | } | |
899 | ||
900 | ret = bitmap_list_store(bs, bm_list, &new_offset, &new_size, false); | |
901 | if (ret < 0) { | |
902 | return ret; | |
903 | } | |
904 | ||
1a0c2bfb | 905 | ret = qcow2_flush_caches(bs); |
5f72826e VSO |
906 | if (ret < 0) { |
907 | goto fail; | |
908 | } | |
909 | ||
910 | s->autoclear_features |= QCOW2_AUTOCLEAR_BITMAPS; | |
911 | } else { | |
912 | s->autoclear_features &= ~(uint64_t)QCOW2_AUTOCLEAR_BITMAPS; | |
913 | } | |
914 | ||
915 | s->bitmap_directory_offset = new_offset; | |
916 | s->bitmap_directory_size = new_size; | |
917 | s->nb_bitmaps = new_nb_bitmaps; | |
918 | ||
919 | ret = update_header_sync(bs); | |
920 | if (ret < 0) { | |
921 | goto fail; | |
922 | } | |
923 | ||
924 | if (old_size > 0) { | |
925 | qcow2_free_clusters(bs, old_offset, old_size, QCOW2_DISCARD_OTHER); | |
926 | } | |
927 | ||
928 | return 0; | |
929 | ||
930 | fail: | |
931 | if (new_offset > 0) { | |
932 | qcow2_free_clusters(bs, new_offset, new_size, QCOW2_DISCARD_OTHER); | |
933 | } | |
934 | ||
935 | s->bitmap_directory_offset = old_offset; | |
936 | s->bitmap_directory_size = old_size; | |
937 | s->nb_bitmaps = old_nb_bitmaps; | |
938 | s->autoclear_features = old_autocl; | |
939 | ||
940 | return ret; | |
941 | } | |
942 | ||
d1258dd0 VSO |
943 | /* for g_slist_foreach for GSList of BdrvDirtyBitmap* elements */ |
944 | static void release_dirty_bitmap_helper(gpointer bitmap, | |
945 | gpointer bs) | |
946 | { | |
5deb6cbd | 947 | bdrv_release_dirty_bitmap(bitmap); |
d1258dd0 VSO |
948 | } |
949 | ||
950 | /* for g_slist_foreach for GSList of BdrvDirtyBitmap* elements */ | |
951 | static void set_readonly_helper(gpointer bitmap, gpointer value) | |
952 | { | |
953 | bdrv_dirty_bitmap_set_readonly(bitmap, (bool)value); | |
954 | } | |
955 | ||
0c1e9d2a VSO |
956 | /* |
957 | * Return true on success, false on failure. | |
958 | * If header_updated is not NULL then it is set appropriately regardless of | |
959 | * the return value. | |
d1258dd0 | 960 | */ |
70bacc44 PB |
961 | bool coroutine_fn GRAPH_RDLOCK |
962 | qcow2_load_dirty_bitmaps(BlockDriverState *bs, | |
963 | bool *header_updated, Error **errp) | |
d1258dd0 VSO |
964 | { |
965 | BDRVQcow2State *s = bs->opaque; | |
966 | Qcow2BitmapList *bm_list; | |
967 | Qcow2Bitmap *bm; | |
968 | GSList *created_dirty_bitmaps = NULL; | |
74da6b94 | 969 | bool needs_update = false; |
d1258dd0 | 970 | |
0c1e9d2a VSO |
971 | if (header_updated) { |
972 | *header_updated = false; | |
973 | } | |
974 | ||
d1258dd0 VSO |
975 | if (s->nb_bitmaps == 0) { |
976 | /* No bitmaps - nothing to do */ | |
0c1e9d2a | 977 | return true; |
d1258dd0 VSO |
978 | } |
979 | ||
980 | bm_list = bitmap_list_load(bs, s->bitmap_directory_offset, | |
981 | s->bitmap_directory_size, errp); | |
982 | if (bm_list == NULL) { | |
983 | return false; | |
984 | } | |
985 | ||
986 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
a505475b VSO |
987 | BdrvDirtyBitmap *bitmap; |
988 | ||
989 | if ((bm->flags & BME_FLAG_IN_USE) && | |
990 | bdrv_find_dirty_bitmap(bs, bm->name)) | |
991 | { | |
992 | /* | |
993 | * We already have corresponding BdrvDirtyBitmap, and bitmap in the | |
994 | * image is marked IN_USE. Firstly, this state is valid, no reason | |
995 | * to consider existing BdrvDirtyBitmap to be bad. Secondly it's | |
996 | * absolutely possible, when we do migration with shared storage | |
997 | * with dirty-bitmaps capability enabled: if the bitmap was loaded | |
998 | * from this storage before migration start, the storage will | |
999 | * of-course contain IN_USE outdated version of the bitmap, and we | |
1000 | * should not load it on migration target, as we already have this | |
1001 | * bitmap, being migrated. | |
1002 | */ | |
1003 | continue; | |
1004 | } | |
1005 | ||
1006 | bitmap = load_bitmap(bs, bm, errp); | |
74da6b94 JS |
1007 | if (bitmap == NULL) { |
1008 | goto fail; | |
1009 | } | |
a0319aac | 1010 | |
796a3798 | 1011 | bdrv_dirty_bitmap_set_persistence(bitmap, true); |
74da6b94 JS |
1012 | if (bm->flags & BME_FLAG_IN_USE) { |
1013 | bdrv_dirty_bitmap_set_inconsistent(bitmap); | |
1014 | } else { | |
1015 | /* NB: updated flags only get written if can_write(bs) is true. */ | |
d1258dd0 | 1016 | bm->flags |= BME_FLAG_IN_USE; |
74da6b94 | 1017 | needs_update = true; |
d1258dd0 | 1018 | } |
74da6b94 JS |
1019 | if (!(bm->flags & BME_FLAG_AUTO)) { |
1020 | bdrv_disable_dirty_bitmap(bitmap); | |
1021 | } | |
1022 | created_dirty_bitmaps = | |
1023 | g_slist_append(created_dirty_bitmaps, bitmap); | |
d1258dd0 VSO |
1024 | } |
1025 | ||
74da6b94 JS |
1026 | if (needs_update && can_write(bs)) { |
1027 | /* in_use flags must be updated */ | |
1028 | int ret = update_ext_header_and_dir_in_place(bs, bm_list); | |
1029 | if (ret < 0) { | |
1030 | error_setg_errno(errp, -ret, "Can't update bitmap directory"); | |
1031 | goto fail; | |
d1258dd0 | 1032 | } |
0c1e9d2a VSO |
1033 | if (header_updated) { |
1034 | *header_updated = true; | |
1035 | } | |
74da6b94 JS |
1036 | } |
1037 | ||
1038 | if (!can_write(bs)) { | |
1039 | g_slist_foreach(created_dirty_bitmaps, set_readonly_helper, | |
1040 | (gpointer)true); | |
d1258dd0 VSO |
1041 | } |
1042 | ||
1043 | g_slist_free(created_dirty_bitmaps); | |
1044 | bitmap_list_free(bm_list); | |
1045 | ||
0c1e9d2a | 1046 | return true; |
d1258dd0 VSO |
1047 | |
1048 | fail: | |
1049 | g_slist_foreach(created_dirty_bitmaps, release_dirty_bitmap_helper, bs); | |
1050 | g_slist_free(created_dirty_bitmaps); | |
1051 | bitmap_list_free(bm_list); | |
1052 | ||
1053 | return false; | |
1054 | } | |
1b6b0562 | 1055 | |
b8968c87 AS |
1056 | |
1057 | static Qcow2BitmapInfoFlagsList *get_bitmap_info_flags(uint32_t flags) | |
1058 | { | |
1059 | Qcow2BitmapInfoFlagsList *list = NULL; | |
c3033fd3 | 1060 | Qcow2BitmapInfoFlagsList **tail = &list; |
b8968c87 AS |
1061 | int i; |
1062 | ||
1063 | static const struct { | |
1064 | int bme; /* Bitmap directory entry flags */ | |
1065 | int info; /* The flags to report to the user */ | |
1066 | } map[] = { | |
1067 | { BME_FLAG_IN_USE, QCOW2_BITMAP_INFO_FLAGS_IN_USE }, | |
1068 | { BME_FLAG_AUTO, QCOW2_BITMAP_INFO_FLAGS_AUTO }, | |
1069 | }; | |
1070 | ||
1071 | int map_size = ARRAY_SIZE(map); | |
1072 | ||
1073 | for (i = 0; i < map_size; ++i) { | |
1074 | if (flags & map[i].bme) { | |
c3033fd3 | 1075 | QAPI_LIST_APPEND(tail, map[i].info); |
b8968c87 AS |
1076 | flags &= ~map[i].bme; |
1077 | } | |
1078 | } | |
1079 | /* Check if the BME_* mapping above is complete */ | |
1080 | assert(!flags); | |
1081 | ||
1082 | return list; | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * qcow2_get_bitmap_info_list() | |
1087 | * Returns a list of QCOW2 bitmap details. | |
83bad8cb VSO |
1088 | * On success return true with info_list set (note, that if there are no |
1089 | * bitmaps, info_list is set to NULL). | |
1090 | * On failure return false with errp set. | |
b8968c87 | 1091 | */ |
83bad8cb VSO |
1092 | bool qcow2_get_bitmap_info_list(BlockDriverState *bs, |
1093 | Qcow2BitmapInfoList **info_list, Error **errp) | |
b8968c87 AS |
1094 | { |
1095 | BDRVQcow2State *s = bs->opaque; | |
1096 | Qcow2BitmapList *bm_list; | |
1097 | Qcow2Bitmap *bm; | |
83bad8cb | 1098 | Qcow2BitmapInfoList **tail; |
b8968c87 AS |
1099 | |
1100 | if (s->nb_bitmaps == 0) { | |
83bad8cb VSO |
1101 | *info_list = NULL; |
1102 | return true; | |
b8968c87 AS |
1103 | } |
1104 | ||
1105 | bm_list = bitmap_list_load(bs, s->bitmap_directory_offset, | |
1106 | s->bitmap_directory_size, errp); | |
83bad8cb VSO |
1107 | if (!bm_list) { |
1108 | return false; | |
b8968c87 AS |
1109 | } |
1110 | ||
83bad8cb VSO |
1111 | *info_list = NULL; |
1112 | tail = info_list; | |
1113 | ||
b8968c87 AS |
1114 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { |
1115 | Qcow2BitmapInfo *info = g_new0(Qcow2BitmapInfo, 1); | |
b8968c87 AS |
1116 | info->granularity = 1U << bm->granularity_bits; |
1117 | info->name = g_strdup(bm->name); | |
1118 | info->flags = get_bitmap_info_flags(bm->flags & ~BME_RESERVED_FLAGS); | |
c3033fd3 | 1119 | QAPI_LIST_APPEND(tail, info); |
b8968c87 AS |
1120 | } |
1121 | ||
1122 | bitmap_list_free(bm_list); | |
1123 | ||
83bad8cb | 1124 | return true; |
b8968c87 AS |
1125 | } |
1126 | ||
bd429a88 | 1127 | int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp) |
1b6b0562 VSO |
1128 | { |
1129 | BDRVQcow2State *s = bs->opaque; | |
1130 | Qcow2BitmapList *bm_list; | |
1131 | Qcow2Bitmap *bm; | |
1132 | GSList *ro_dirty_bitmaps = NULL; | |
f6333cbf VSO |
1133 | int ret = -EINVAL; |
1134 | bool need_header_update = false; | |
1b6b0562 VSO |
1135 | |
1136 | if (s->nb_bitmaps == 0) { | |
1137 | /* No bitmaps - nothing to do */ | |
1138 | return 0; | |
1139 | } | |
1140 | ||
1b6b0562 VSO |
1141 | bm_list = bitmap_list_load(bs, s->bitmap_directory_offset, |
1142 | s->bitmap_directory_size, errp); | |
1143 | if (bm_list == NULL) { | |
1144 | return -EINVAL; | |
1145 | } | |
1146 | ||
1147 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
74da6b94 | 1148 | BdrvDirtyBitmap *bitmap = bdrv_find_dirty_bitmap(bs, bm->name); |
1b6b0562 | 1149 | |
f6333cbf VSO |
1150 | if (!bitmap) { |
1151 | error_setg(errp, "Unexpected bitmap '%s' in image '%s'", | |
1152 | bm->name, bs->filename); | |
74da6b94 | 1153 | goto out; |
1b6b0562 | 1154 | } |
74da6b94 | 1155 | |
f6333cbf VSO |
1156 | if (!(bm->flags & BME_FLAG_IN_USE)) { |
1157 | if (!bdrv_dirty_bitmap_readonly(bitmap)) { | |
1158 | error_setg(errp, "Corruption: bitmap '%s' is not marked IN_USE " | |
1159 | "in the image '%s' and not marked readonly in RAM", | |
1160 | bm->name, bs->filename); | |
1161 | goto out; | |
1162 | } | |
1163 | if (bdrv_dirty_bitmap_inconsistent(bitmap)) { | |
1164 | error_setg(errp, "Corruption: bitmap '%s' is inconsistent but " | |
1165 | "is not marked IN_USE in the image '%s'", bm->name, | |
1166 | bs->filename); | |
1167 | goto out; | |
1168 | } | |
1169 | ||
1170 | bm->flags |= BME_FLAG_IN_USE; | |
1171 | need_header_update = true; | |
1172 | } else { | |
1173 | /* | |
1174 | * What if flags already has BME_FLAG_IN_USE ? | |
1175 | * | |
1176 | * 1. if we are reopening RW -> RW it's OK, of course. | |
1177 | * 2. if we are reopening RO -> RW: | |
1178 | * 2.1 if @bitmap is inconsistent, it's OK. It means that it was | |
1179 | * inconsistent (IN_USE) when we loaded it | |
1180 | * 2.2 if @bitmap is not inconsistent. This seems to be impossible | |
1181 | * and implies third party interaction. Let's error-out for | |
1182 | * safety. | |
1183 | */ | |
1184 | if (bdrv_dirty_bitmap_readonly(bitmap) && | |
1185 | !bdrv_dirty_bitmap_inconsistent(bitmap)) | |
1186 | { | |
1187 | error_setg(errp, "Corruption: bitmap '%s' is marked IN_USE " | |
1188 | "in the image '%s' but it is readonly and " | |
1189 | "consistent in RAM", | |
1190 | bm->name, bs->filename); | |
1191 | goto out; | |
1192 | } | |
1193 | } | |
1194 | ||
1195 | if (bdrv_dirty_bitmap_readonly(bitmap)) { | |
1196 | ro_dirty_bitmaps = g_slist_append(ro_dirty_bitmaps, bitmap); | |
1197 | } | |
1b6b0562 VSO |
1198 | } |
1199 | ||
f6333cbf VSO |
1200 | if (need_header_update) { |
1201 | if (!can_write(bs->file->bs) || !(bs->file->perm & BLK_PERM_WRITE)) { | |
1202 | error_setg(errp, "Failed to reopen bitmaps rw: no write access " | |
1203 | "the protocol file"); | |
1204 | goto out; | |
1205 | } | |
1206 | ||
1b6b0562 VSO |
1207 | /* in_use flags must be updated */ |
1208 | ret = update_ext_header_and_dir_in_place(bs, bm_list); | |
1209 | if (ret < 0) { | |
f6333cbf | 1210 | error_setg_errno(errp, -ret, "Cannot update bitmap directory"); |
1b6b0562 VSO |
1211 | goto out; |
1212 | } | |
1b6b0562 VSO |
1213 | } |
1214 | ||
8485563a | 1215 | g_slist_foreach(ro_dirty_bitmaps, set_readonly_helper, (gpointer)false); |
f6333cbf VSO |
1216 | ret = 0; |
1217 | ||
1b6b0562 VSO |
1218 | out: |
1219 | g_slist_free(ro_dirty_bitmaps); | |
1220 | bitmap_list_free(bm_list); | |
1221 | ||
1222 | return ret; | |
1223 | } | |
5f72826e | 1224 | |
d19c6b36 | 1225 | /* Checks to see if it's safe to resize bitmaps */ |
a39bae4e | 1226 | int coroutine_fn qcow2_truncate_bitmaps_check(BlockDriverState *bs, Error **errp) |
d19c6b36 JS |
1227 | { |
1228 | BDRVQcow2State *s = bs->opaque; | |
1229 | Qcow2BitmapList *bm_list; | |
1230 | Qcow2Bitmap *bm; | |
1231 | int ret = 0; | |
1232 | ||
1233 | if (s->nb_bitmaps == 0) { | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | bm_list = bitmap_list_load(bs, s->bitmap_directory_offset, | |
1238 | s->bitmap_directory_size, errp); | |
1239 | if (bm_list == NULL) { | |
1240 | return -EINVAL; | |
1241 | } | |
1242 | ||
1243 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
1244 | BdrvDirtyBitmap *bitmap = bdrv_find_dirty_bitmap(bs, bm->name); | |
1245 | if (bitmap == NULL) { | |
1246 | /* | |
1247 | * We rely on all bitmaps being in-memory to be able to resize them, | |
1248 | * Otherwise, we'd need to resize them on disk explicitly | |
1249 | */ | |
1250 | error_setg(errp, "Cannot resize qcow2 with persistent bitmaps that " | |
1251 | "were not loaded into memory"); | |
1252 | ret = -ENOTSUP; | |
1253 | goto out; | |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * The checks against readonly and busy are redundant, but certainly | |
1258 | * do no harm. checks against inconsistent are crucial: | |
1259 | */ | |
1260 | if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) { | |
1261 | ret = -ENOTSUP; | |
1262 | goto out; | |
1263 | } | |
1264 | } | |
1265 | ||
1266 | out: | |
1267 | bitmap_list_free(bm_list); | |
1268 | return ret; | |
1269 | } | |
1270 | ||
5f72826e VSO |
1271 | /* store_bitmap_data() |
1272 | * Store bitmap to image, filling bitmap table accordingly. | |
1273 | */ | |
1274 | static uint64_t *store_bitmap_data(BlockDriverState *bs, | |
1275 | BdrvDirtyBitmap *bitmap, | |
1276 | uint32_t *bitmap_table_size, Error **errp) | |
1277 | { | |
1278 | int ret; | |
1279 | BDRVQcow2State *s = bs->opaque; | |
49d741b5 EB |
1280 | int64_t offset; |
1281 | uint64_t limit; | |
5f72826e VSO |
1282 | uint64_t bm_size = bdrv_dirty_bitmap_size(bitmap); |
1283 | const char *bm_name = bdrv_dirty_bitmap_name(bitmap); | |
1284 | uint8_t *buf = NULL; | |
5f72826e VSO |
1285 | uint64_t *tb; |
1286 | uint64_t tb_size = | |
1287 | size_to_clusters(s, | |
86f6ae67 | 1288 | bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_size)); |
5f72826e VSO |
1289 | |
1290 | if (tb_size > BME_MAX_TABLE_SIZE || | |
1291 | tb_size * s->cluster_size > BME_MAX_PHYS_SIZE) | |
1292 | { | |
1293 | error_setg(errp, "Bitmap '%s' is too big", bm_name); | |
1294 | return NULL; | |
1295 | } | |
1296 | ||
1297 | tb = g_try_new0(uint64_t, tb_size); | |
1298 | if (tb == NULL) { | |
1299 | error_setg(errp, "No memory"); | |
1300 | return NULL; | |
1301 | } | |
1302 | ||
5f72826e | 1303 | buf = g_malloc(s->cluster_size); |
35f428ba | 1304 | limit = bdrv_dirty_bitmap_serialization_coverage(s->cluster_size, bitmap); |
c7e7c87a | 1305 | assert(DIV_ROUND_UP(bm_size, limit) == tb_size); |
5f72826e | 1306 | |
2d00cbd8 VSO |
1307 | offset = 0; |
1308 | while ((offset = bdrv_dirty_bitmap_next_dirty(bitmap, offset, INT64_MAX)) | |
1309 | >= 0) | |
1310 | { | |
49d741b5 | 1311 | uint64_t cluster = offset / limit; |
5f72826e VSO |
1312 | uint64_t end, write_size; |
1313 | int64_t off; | |
1314 | ||
49d741b5 EB |
1315 | /* |
1316 | * We found the first dirty offset, but want to write out the | |
1317 | * entire cluster of the bitmap that includes that offset, | |
1318 | * including any leading zero bits. | |
1319 | */ | |
1320 | offset = QEMU_ALIGN_DOWN(offset, limit); | |
1321 | end = MIN(bm_size, offset + limit); | |
1322 | write_size = bdrv_dirty_bitmap_serialization_size(bitmap, offset, | |
1323 | end - offset); | |
5f72826e VSO |
1324 | assert(write_size <= s->cluster_size); |
1325 | ||
1326 | off = qcow2_alloc_clusters(bs, s->cluster_size); | |
1327 | if (off < 0) { | |
1328 | error_setg_errno(errp, -off, | |
1329 | "Failed to allocate clusters for bitmap '%s'", | |
1330 | bm_name); | |
1331 | goto fail; | |
1332 | } | |
1333 | tb[cluster] = off; | |
1334 | ||
49d741b5 | 1335 | bdrv_dirty_bitmap_serialize_part(bitmap, buf, offset, end - offset); |
5f72826e VSO |
1336 | if (write_size < s->cluster_size) { |
1337 | memset(buf + write_size, 0, s->cluster_size - write_size); | |
1338 | } | |
1339 | ||
966b000f | 1340 | ret = qcow2_pre_write_overlap_check(bs, 0, off, s->cluster_size, false); |
5f72826e VSO |
1341 | if (ret < 0) { |
1342 | error_setg_errno(errp, -ret, "Qcow2 overlap check failed"); | |
1343 | goto fail; | |
1344 | } | |
1345 | ||
32cc71de | 1346 | ret = bdrv_pwrite(bs->file, off, s->cluster_size, buf, 0); |
5f72826e VSO |
1347 | if (ret < 0) { |
1348 | error_setg_errno(errp, -ret, "Failed to write bitmap '%s' to file", | |
1349 | bm_name); | |
1350 | goto fail; | |
1351 | } | |
1352 | ||
2d00cbd8 | 1353 | offset = end; |
5f72826e VSO |
1354 | } |
1355 | ||
1356 | *bitmap_table_size = tb_size; | |
1357 | g_free(buf); | |
5f72826e VSO |
1358 | |
1359 | return tb; | |
1360 | ||
1361 | fail: | |
1362 | clear_bitmap_table(bs, tb, tb_size); | |
1363 | g_free(buf); | |
5f72826e VSO |
1364 | g_free(tb); |
1365 | ||
1366 | return NULL; | |
1367 | } | |
1368 | ||
1369 | /* store_bitmap() | |
1370 | * Store bm->dirty_bitmap to qcow2. | |
1371 | * Set bm->table_offset and bm->table_size accordingly. | |
1372 | */ | |
1373 | static int store_bitmap(BlockDriverState *bs, Qcow2Bitmap *bm, Error **errp) | |
1374 | { | |
1375 | int ret; | |
1376 | uint64_t *tb; | |
1377 | int64_t tb_offset; | |
1378 | uint32_t tb_size; | |
1379 | BdrvDirtyBitmap *bitmap = bm->dirty_bitmap; | |
1380 | const char *bm_name; | |
1381 | ||
1382 | assert(bitmap != NULL); | |
1383 | ||
1384 | bm_name = bdrv_dirty_bitmap_name(bitmap); | |
1385 | ||
1386 | tb = store_bitmap_data(bs, bitmap, &tb_size, errp); | |
1387 | if (tb == NULL) { | |
1388 | return -EINVAL; | |
1389 | } | |
1390 | ||
1391 | assert(tb_size <= BME_MAX_TABLE_SIZE); | |
1392 | tb_offset = qcow2_alloc_clusters(bs, tb_size * sizeof(tb[0])); | |
1393 | if (tb_offset < 0) { | |
1394 | error_setg_errno(errp, -tb_offset, | |
1395 | "Failed to allocate clusters for bitmap '%s'", | |
1396 | bm_name); | |
1397 | ret = tb_offset; | |
1398 | goto fail; | |
1399 | } | |
1400 | ||
1401 | ret = qcow2_pre_write_overlap_check(bs, 0, tb_offset, | |
966b000f | 1402 | tb_size * sizeof(tb[0]), false); |
5f72826e VSO |
1403 | if (ret < 0) { |
1404 | error_setg_errno(errp, -ret, "Qcow2 overlap check failed"); | |
1405 | goto fail; | |
1406 | } | |
1407 | ||
b03dd961 | 1408 | bitmap_table_bswap_be(tb, tb_size); |
32cc71de | 1409 | ret = bdrv_pwrite(bs->file, tb_offset, tb_size * sizeof(tb[0]), tb, 0); |
5f72826e | 1410 | if (ret < 0) { |
b03dd961 | 1411 | bitmap_table_bswap_be(tb, tb_size); |
5f72826e VSO |
1412 | error_setg_errno(errp, -ret, "Failed to write bitmap '%s' to file", |
1413 | bm_name); | |
1414 | goto fail; | |
1415 | } | |
1416 | ||
1417 | g_free(tb); | |
1418 | ||
1419 | bm->table.offset = tb_offset; | |
1420 | bm->table.size = tb_size; | |
1421 | ||
1422 | return 0; | |
1423 | ||
1424 | fail: | |
1425 | clear_bitmap_table(bs, tb, tb_size); | |
1426 | ||
1427 | if (tb_offset > 0) { | |
1428 | qcow2_free_clusters(bs, tb_offset, tb_size * sizeof(tb[0]), | |
1429 | QCOW2_DISCARD_OTHER); | |
1430 | } | |
1431 | ||
1432 | g_free(tb); | |
1433 | ||
1434 | return ret; | |
1435 | } | |
1436 | ||
1437 | static Qcow2Bitmap *find_bitmap_by_name(Qcow2BitmapList *bm_list, | |
1438 | const char *name) | |
1439 | { | |
1440 | Qcow2Bitmap *bm; | |
1441 | ||
1442 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
1443 | if (strcmp(name, bm->name) == 0) { | |
1444 | return bm; | |
1445 | } | |
1446 | } | |
1447 | ||
1448 | return NULL; | |
1449 | } | |
1450 | ||
d2c3080e VSO |
1451 | int coroutine_fn qcow2_co_remove_persistent_dirty_bitmap(BlockDriverState *bs, |
1452 | const char *name, | |
1453 | Error **errp) | |
469c71ed VSO |
1454 | { |
1455 | int ret; | |
1456 | BDRVQcow2State *s = bs->opaque; | |
d2c3080e | 1457 | Qcow2Bitmap *bm = NULL; |
469c71ed VSO |
1458 | Qcow2BitmapList *bm_list; |
1459 | ||
1460 | if (s->nb_bitmaps == 0) { | |
f56281ab VSO |
1461 | /* |
1462 | * Absence of the bitmap is not an error: see explanation above | |
1463 | * bdrv_co_remove_persistent_dirty_bitmap() definition. | |
1464 | */ | |
b56a1e31 | 1465 | return 0; |
469c71ed VSO |
1466 | } |
1467 | ||
d2c3080e VSO |
1468 | qemu_co_mutex_lock(&s->lock); |
1469 | ||
469c71ed VSO |
1470 | bm_list = bitmap_list_load(bs, s->bitmap_directory_offset, |
1471 | s->bitmap_directory_size, errp); | |
1472 | if (bm_list == NULL) { | |
d2c3080e VSO |
1473 | ret = -EIO; |
1474 | goto out; | |
469c71ed VSO |
1475 | } |
1476 | ||
1477 | bm = find_bitmap_by_name(bm_list, name); | |
1478 | if (bm == NULL) { | |
f56281ab VSO |
1479 | /* Absence of the bitmap is not an error, see above. */ |
1480 | ret = 0; | |
b56a1e31 | 1481 | goto out; |
469c71ed VSO |
1482 | } |
1483 | ||
1484 | QSIMPLEQ_REMOVE(bm_list, bm, Qcow2Bitmap, entry); | |
1485 | ||
1486 | ret = update_ext_header_and_dir(bs, bm_list); | |
1487 | if (ret < 0) { | |
1488 | error_setg_errno(errp, -ret, "Failed to update bitmap extension"); | |
b56a1e31 | 1489 | goto out; |
469c71ed VSO |
1490 | } |
1491 | ||
1492 | free_bitmap_clusters(bs, &bm->table); | |
1493 | ||
b56a1e31 | 1494 | out: |
d2c3080e VSO |
1495 | qemu_co_mutex_unlock(&s->lock); |
1496 | ||
469c71ed VSO |
1497 | bitmap_free(bm); |
1498 | bitmap_list_free(bm_list); | |
b56a1e31 VSO |
1499 | |
1500 | return ret; | |
469c71ed VSO |
1501 | } |
1502 | ||
644ddbb7 VSO |
1503 | /* |
1504 | * qcow2_store_persistent_dirty_bitmaps | |
1505 | * | |
1506 | * Stores persistent BdrvDirtyBitmap objects. | |
1507 | * | |
1508 | * @release_stored: if true, release BdrvDirtyBitmap's after storing to the | |
1509 | * image. This is used in two cases, both via qcow2_inactivate: | |
1510 | * 1. bdrv_close: It's correct to remove bitmaps on close. | |
1511 | * 2. migration: If bitmaps are migrated through migration channel via | |
1512 | * 'dirty-bitmaps' migration capability they are not handled by this code. | |
1513 | * Otherwise, it's OK to drop BdrvDirtyBitmap's and reload them on | |
1514 | * invalidation. | |
1515 | * | |
1516 | * Anyway, it's correct to remove BdrvDirtyBitmap's on inactivation, as | |
1517 | * inactivation means that we lose control on disk, and therefore on bitmaps, | |
1518 | * we should sync them and do not touch more. | |
1519 | * | |
1520 | * Contrariwise, we don't want to release any bitmaps on just reopen-to-ro, | |
1521 | * when we need to store them, as image is still under our control, and it's | |
1522 | * good to keep all the bitmaps in read-only mode. Moreover, keeping them | |
1523 | * read-only is correct because this is what would happen if we opened the node | |
1524 | * readonly to begin with, and whether we opened directly or reopened to that | |
1525 | * state shouldn't matter for the state we get afterward. | |
1526 | */ | |
526e31de | 1527 | bool qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs, |
644ddbb7 | 1528 | bool release_stored, Error **errp) |
5f72826e | 1529 | { |
526e31de | 1530 | ERRP_GUARD(); |
5f72826e VSO |
1531 | BdrvDirtyBitmap *bitmap; |
1532 | BDRVQcow2State *s = bs->opaque; | |
1533 | uint32_t new_nb_bitmaps = s->nb_bitmaps; | |
1534 | uint64_t new_dir_size = s->bitmap_directory_size; | |
1535 | int ret; | |
1536 | Qcow2BitmapList *bm_list; | |
1537 | Qcow2Bitmap *bm; | |
b58deb34 | 1538 | QSIMPLEQ_HEAD(, Qcow2BitmapTable) drop_tables; |
5f72826e | 1539 | Qcow2BitmapTable *tb, *tb_next; |
f88676c1 | 1540 | bool need_write = false; |
5f72826e VSO |
1541 | |
1542 | QSIMPLEQ_INIT(&drop_tables); | |
1543 | ||
1544 | if (s->nb_bitmaps == 0) { | |
1545 | bm_list = bitmap_list_new(); | |
1546 | } else { | |
1547 | bm_list = bitmap_list_load(bs, s->bitmap_directory_offset, | |
1548 | s->bitmap_directory_size, errp); | |
1549 | if (bm_list == NULL) { | |
526e31de | 1550 | return false; |
5f72826e VSO |
1551 | } |
1552 | } | |
1553 | ||
1554 | /* check constraints and names */ | |
ef9041a7 | 1555 | FOR_EACH_DIRTY_BITMAP(bs, bitmap) { |
5f72826e VSO |
1556 | const char *name = bdrv_dirty_bitmap_name(bitmap); |
1557 | uint32_t granularity = bdrv_dirty_bitmap_granularity(bitmap); | |
1558 | Qcow2Bitmap *bm; | |
1559 | ||
796a3798 | 1560 | if (!bdrv_dirty_bitmap_get_persistence(bitmap) || |
74da6b94 | 1561 | bdrv_dirty_bitmap_inconsistent(bitmap)) { |
5f72826e VSO |
1562 | continue; |
1563 | } | |
1564 | ||
fe16c7dd HR |
1565 | if (bdrv_dirty_bitmap_readonly(bitmap)) { |
1566 | /* | |
1567 | * Store the bitmap in the associated Qcow2Bitmap so it | |
1568 | * can be released later | |
1569 | */ | |
1570 | bm = find_bitmap_by_name(bm_list, name); | |
1571 | if (bm) { | |
1572 | bm->dirty_bitmap = bitmap; | |
1573 | } | |
1574 | continue; | |
1575 | } | |
1576 | ||
f88676c1 VSO |
1577 | need_write = true; |
1578 | ||
5f72826e VSO |
1579 | if (check_constraints_on_bitmap(bs, name, granularity, errp) < 0) { |
1580 | error_prepend(errp, "Bitmap '%s' doesn't satisfy the constraints: ", | |
1581 | name); | |
1582 | goto fail; | |
1583 | } | |
1584 | ||
1585 | bm = find_bitmap_by_name(bm_list, name); | |
1586 | if (bm == NULL) { | |
1587 | if (++new_nb_bitmaps > QCOW2_MAX_BITMAPS) { | |
1588 | error_setg(errp, "Too many persistent bitmaps"); | |
1589 | goto fail; | |
1590 | } | |
1591 | ||
1592 | new_dir_size += calc_dir_entry_size(strlen(name), 0); | |
1593 | if (new_dir_size > QCOW2_MAX_BITMAP_DIRECTORY_SIZE) { | |
1594 | error_setg(errp, "Bitmap directory is too large"); | |
1595 | goto fail; | |
1596 | } | |
1597 | ||
1598 | bm = g_new0(Qcow2Bitmap, 1); | |
1599 | bm->name = g_strdup(name); | |
1600 | QSIMPLEQ_INSERT_TAIL(bm_list, bm, entry); | |
1601 | } else { | |
1602 | if (!(bm->flags & BME_FLAG_IN_USE)) { | |
1603 | error_setg(errp, "Bitmap '%s' already exists in the image", | |
1604 | name); | |
1605 | goto fail; | |
1606 | } | |
1607 | tb = g_memdup(&bm->table, sizeof(bm->table)); | |
1608 | bm->table.offset = 0; | |
1609 | bm->table.size = 0; | |
1610 | QSIMPLEQ_INSERT_TAIL(&drop_tables, tb, entry); | |
1611 | } | |
3e99da5e | 1612 | bm->flags = bdrv_dirty_bitmap_enabled(bitmap) ? BME_FLAG_AUTO : 0; |
5f72826e VSO |
1613 | bm->granularity_bits = ctz32(bdrv_dirty_bitmap_granularity(bitmap)); |
1614 | bm->dirty_bitmap = bitmap; | |
1615 | } | |
1616 | ||
f88676c1 VSO |
1617 | if (!need_write) { |
1618 | goto success; | |
1619 | } | |
1620 | ||
1621 | if (!can_write(bs)) { | |
1622 | error_setg(errp, "No write access"); | |
1623 | goto fail; | |
1624 | } | |
1625 | ||
5f72826e VSO |
1626 | /* allocate clusters and store bitmaps */ |
1627 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
fe16c7dd HR |
1628 | BdrvDirtyBitmap *bitmap = bm->dirty_bitmap; |
1629 | ||
1630 | if (bitmap == NULL || bdrv_dirty_bitmap_readonly(bitmap)) { | |
5f72826e VSO |
1631 | continue; |
1632 | } | |
1633 | ||
1634 | ret = store_bitmap(bs, bm, errp); | |
1635 | if (ret < 0) { | |
1636 | goto fail; | |
1637 | } | |
1638 | } | |
1639 | ||
1640 | ret = update_ext_header_and_dir(bs, bm_list); | |
1641 | if (ret < 0) { | |
1642 | error_setg_errno(errp, -ret, "Failed to update bitmap extension"); | |
1643 | goto fail; | |
1644 | } | |
1645 | ||
1646 | /* Bitmap directory was successfully updated, so, old data can be dropped. | |
1647 | * TODO it is better to reuse these clusters */ | |
1648 | QSIMPLEQ_FOREACH_SAFE(tb, &drop_tables, entry, tb_next) { | |
1649 | free_bitmap_clusters(bs, tb); | |
1650 | g_free(tb); | |
1651 | } | |
1652 | ||
fe16c7dd | 1653 | success: |
644ddbb7 VSO |
1654 | if (release_stored) { |
1655 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
1656 | if (bm->dirty_bitmap == NULL) { | |
1657 | continue; | |
1658 | } | |
9c98f145 | 1659 | |
644ddbb7 VSO |
1660 | bdrv_release_dirty_bitmap(bm->dirty_bitmap); |
1661 | } | |
9c98f145 VSO |
1662 | } |
1663 | ||
5f72826e | 1664 | bitmap_list_free(bm_list); |
526e31de | 1665 | return true; |
5f72826e VSO |
1666 | |
1667 | fail: | |
1668 | QSIMPLEQ_FOREACH(bm, bm_list, entry) { | |
fe16c7dd HR |
1669 | if (bm->dirty_bitmap == NULL || bm->table.offset == 0 || |
1670 | bdrv_dirty_bitmap_readonly(bm->dirty_bitmap)) | |
1671 | { | |
5f72826e VSO |
1672 | continue; |
1673 | } | |
1674 | ||
1675 | free_bitmap_clusters(bs, &bm->table); | |
1676 | } | |
1677 | ||
1678 | QSIMPLEQ_FOREACH_SAFE(tb, &drop_tables, entry, tb_next) { | |
1679 | g_free(tb); | |
1680 | } | |
1681 | ||
1682 | bitmap_list_free(bm_list); | |
526e31de | 1683 | return false; |
5f72826e | 1684 | } |
169b8793 VSO |
1685 | |
1686 | int qcow2_reopen_bitmaps_ro(BlockDriverState *bs, Error **errp) | |
1687 | { | |
1688 | BdrvDirtyBitmap *bitmap; | |
169b8793 | 1689 | |
526e31de | 1690 | if (!qcow2_store_persistent_dirty_bitmaps(bs, false, errp)) { |
169b8793 VSO |
1691 | return -EINVAL; |
1692 | } | |
1693 | ||
ef9041a7 | 1694 | FOR_EACH_DIRTY_BITMAP(bs, bitmap) { |
796a3798 | 1695 | if (bdrv_dirty_bitmap_get_persistence(bitmap)) { |
169b8793 VSO |
1696 | bdrv_dirty_bitmap_set_readonly(bitmap, true); |
1697 | } | |
1698 | } | |
1699 | ||
1700 | return 0; | |
1701 | } | |
da0eb242 | 1702 | |
d2c3080e VSO |
1703 | bool coroutine_fn qcow2_co_can_store_new_dirty_bitmap(BlockDriverState *bs, |
1704 | const char *name, | |
1705 | uint32_t granularity, | |
1706 | Error **errp) | |
da0eb242 VSO |
1707 | { |
1708 | BDRVQcow2State *s = bs->opaque; | |
a1db8733 VSO |
1709 | BdrvDirtyBitmap *bitmap; |
1710 | uint64_t bitmap_directory_size = 0; | |
1711 | uint32_t nb_bitmaps = 0; | |
1712 | ||
1713 | if (bdrv_find_dirty_bitmap(bs, name)) { | |
1714 | error_setg(errp, "Bitmap already exists: %s", name); | |
1715 | return false; | |
1716 | } | |
da0eb242 | 1717 | |
c9ceb3ec HR |
1718 | if (s->qcow_version < 3) { |
1719 | /* Without autoclear_features, we would always have to assume | |
1720 | * that a program without persistent dirty bitmap support has | |
1721 | * accessed this qcow2 file when opening it, and would thus | |
1722 | * have to drop all dirty bitmaps (defeating their purpose). | |
1723 | */ | |
1724 | error_setg(errp, "Cannot store dirty bitmaps in qcow2 v2 files"); | |
1725 | goto fail; | |
1726 | } | |
1727 | ||
da0eb242 VSO |
1728 | if (check_constraints_on_bitmap(bs, name, granularity, errp) != 0) { |
1729 | goto fail; | |
1730 | } | |
1731 | ||
a1db8733 VSO |
1732 | FOR_EACH_DIRTY_BITMAP(bs, bitmap) { |
1733 | if (bdrv_dirty_bitmap_get_persistence(bitmap)) { | |
1734 | nb_bitmaps++; | |
1735 | bitmap_directory_size += | |
1736 | calc_dir_entry_size(strlen(bdrv_dirty_bitmap_name(bitmap)), 0); | |
1737 | } | |
da0eb242 | 1738 | } |
a1db8733 VSO |
1739 | nb_bitmaps++; |
1740 | bitmap_directory_size += calc_dir_entry_size(strlen(name), 0); | |
da0eb242 | 1741 | |
a1db8733 | 1742 | if (nb_bitmaps > QCOW2_MAX_BITMAPS) { |
da0eb242 VSO |
1743 | error_setg(errp, |
1744 | "Maximum number of persistent bitmaps is already reached"); | |
1745 | goto fail; | |
1746 | } | |
1747 | ||
a1db8733 | 1748 | if (bitmap_directory_size > QCOW2_MAX_BITMAP_DIRECTORY_SIZE) { |
da0eb242 VSO |
1749 | error_setg(errp, "Not enough space in the bitmap directory"); |
1750 | goto fail; | |
1751 | } | |
1752 | ||
da0eb242 VSO |
1753 | return true; |
1754 | ||
1755 | fail: | |
1756 | error_prepend(errp, "Can't make bitmap '%s' persistent in '%s': ", | |
1757 | name, bdrv_get_device_or_node_name(bs)); | |
1758 | return false; | |
1759 | } | |
ef893b5c EB |
1760 | |
1761 | bool qcow2_supports_persistent_dirty_bitmap(BlockDriverState *bs) | |
1762 | { | |
1763 | BDRVQcow2State *s = bs->opaque; | |
1764 | ||
1765 | return s->qcow_version >= 3; | |
1766 | } | |
5d72c68b EB |
1767 | |
1768 | /* | |
f17d6847 | 1769 | * Compute the space required to copy bitmaps from @in_bs. |
5d72c68b EB |
1770 | * |
1771 | * The computation is based as if copying to a new image with the | |
f17d6847 EB |
1772 | * given @cluster_size, which may differ from the cluster size in |
1773 | * @in_bs; in fact, @in_bs might be something other than qcow2. | |
5d72c68b | 1774 | */ |
f17d6847 | 1775 | uint64_t qcow2_get_persistent_dirty_bitmap_size(BlockDriverState *in_bs, |
5d72c68b EB |
1776 | uint32_t cluster_size) |
1777 | { | |
1778 | uint64_t bitmaps_size = 0; | |
1779 | BdrvDirtyBitmap *bm; | |
1780 | size_t bitmap_dir_size = 0; | |
1781 | ||
f17d6847 | 1782 | FOR_EACH_DIRTY_BITMAP(in_bs, bm) { |
5d72c68b EB |
1783 | if (bdrv_dirty_bitmap_get_persistence(bm)) { |
1784 | const char *name = bdrv_dirty_bitmap_name(bm); | |
1785 | uint32_t granularity = bdrv_dirty_bitmap_granularity(bm); | |
1786 | uint64_t bmbytes = | |
1787 | get_bitmap_bytes_needed(bdrv_dirty_bitmap_size(bm), | |
1788 | granularity); | |
1789 | uint64_t bmclusters = DIV_ROUND_UP(bmbytes, cluster_size); | |
1790 | ||
1791 | /* Assume the entire bitmap is allocated */ | |
1792 | bitmaps_size += bmclusters * cluster_size; | |
1793 | /* Also reserve space for the bitmap table entries */ | |
02b1ecfa | 1794 | bitmaps_size += ROUND_UP(bmclusters * BME_TABLE_ENTRY_SIZE, |
5d72c68b EB |
1795 | cluster_size); |
1796 | /* And space for contribution to bitmap directory size */ | |
1797 | bitmap_dir_size += calc_dir_entry_size(strlen(name), 0); | |
1798 | } | |
1799 | } | |
1800 | bitmaps_size += ROUND_UP(bitmap_dir_size, cluster_size); | |
1801 | ||
1802 | return bitmaps_size; | |
1803 | } |