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Commit | Line | Data |
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75411d23 SH |
1 | /* |
2 | * QEMU Enhanced Disk Format | |
3 | * | |
4 | * Copyright IBM, Corp. 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | |
8 | * Anthony Liguori <aliguori@us.ibm.com> | |
9 | * | |
10 | * This work is licensed under the terms of the GNU LGPL, version 2 or later. | |
11 | * See the COPYING.LIB file in the top-level directory. | |
12 | * | |
13 | */ | |
14 | ||
80c71a24 | 15 | #include "qemu/osdep.h" |
609f45ea | 16 | #include "block/qdict.h" |
da34e65c | 17 | #include "qapi/error.h" |
1de7afc9 | 18 | #include "qemu/timer.h" |
58369e22 | 19 | #include "qemu/bswap.h" |
db725815 | 20 | #include "qemu/main-loop.h" |
0b8fa32f | 21 | #include "qemu/module.h" |
922a01a0 | 22 | #include "qemu/option.h" |
5df022cf | 23 | #include "qemu/memalign.h" |
eabba580 | 24 | #include "trace.h" |
75411d23 | 25 | #include "qed.h" |
8a56fdad | 26 | #include "sysemu/block-backend.h" |
959355a4 KW |
27 | #include "qapi/qmp/qdict.h" |
28 | #include "qapi/qobject-input-visitor.h" | |
29 | #include "qapi/qapi-visit-block-core.h" | |
30 | ||
31 | static QemuOptsList qed_create_opts; | |
75411d23 SH |
32 | |
33 | static int bdrv_qed_probe(const uint8_t *buf, int buf_size, | |
34 | const char *filename) | |
35 | { | |
36 | const QEDHeader *header = (const QEDHeader *)buf; | |
37 | ||
38 | if (buf_size < sizeof(*header)) { | |
39 | return 0; | |
40 | } | |
41 | if (le32_to_cpu(header->magic) != QED_MAGIC) { | |
42 | return 0; | |
43 | } | |
44 | return 100; | |
45 | } | |
46 | ||
47 | /** | |
48 | * Check whether an image format is raw | |
49 | * | |
50 | * @fmt: Backing file format, may be NULL | |
51 | */ | |
52 | static bool qed_fmt_is_raw(const char *fmt) | |
53 | { | |
54 | return fmt && strcmp(fmt, "raw") == 0; | |
55 | } | |
56 | ||
57 | static void qed_header_le_to_cpu(const QEDHeader *le, QEDHeader *cpu) | |
58 | { | |
59 | cpu->magic = le32_to_cpu(le->magic); | |
60 | cpu->cluster_size = le32_to_cpu(le->cluster_size); | |
61 | cpu->table_size = le32_to_cpu(le->table_size); | |
62 | cpu->header_size = le32_to_cpu(le->header_size); | |
63 | cpu->features = le64_to_cpu(le->features); | |
64 | cpu->compat_features = le64_to_cpu(le->compat_features); | |
65 | cpu->autoclear_features = le64_to_cpu(le->autoclear_features); | |
66 | cpu->l1_table_offset = le64_to_cpu(le->l1_table_offset); | |
67 | cpu->image_size = le64_to_cpu(le->image_size); | |
68 | cpu->backing_filename_offset = le32_to_cpu(le->backing_filename_offset); | |
69 | cpu->backing_filename_size = le32_to_cpu(le->backing_filename_size); | |
70 | } | |
71 | ||
72 | static void qed_header_cpu_to_le(const QEDHeader *cpu, QEDHeader *le) | |
73 | { | |
74 | le->magic = cpu_to_le32(cpu->magic); | |
75 | le->cluster_size = cpu_to_le32(cpu->cluster_size); | |
76 | le->table_size = cpu_to_le32(cpu->table_size); | |
77 | le->header_size = cpu_to_le32(cpu->header_size); | |
78 | le->features = cpu_to_le64(cpu->features); | |
79 | le->compat_features = cpu_to_le64(cpu->compat_features); | |
80 | le->autoclear_features = cpu_to_le64(cpu->autoclear_features); | |
81 | le->l1_table_offset = cpu_to_le64(cpu->l1_table_offset); | |
82 | le->image_size = cpu_to_le64(cpu->image_size); | |
83 | le->backing_filename_offset = cpu_to_le32(cpu->backing_filename_offset); | |
84 | le->backing_filename_size = cpu_to_le32(cpu->backing_filename_size); | |
85 | } | |
86 | ||
b10170ac | 87 | int qed_write_header_sync(BDRVQEDState *s) |
75411d23 SH |
88 | { |
89 | QEDHeader le; | |
75411d23 SH |
90 | |
91 | qed_header_cpu_to_le(&s->header, &le); | |
353a5d84 | 92 | return bdrv_pwrite(s->bs->file, 0, sizeof(le), &le, 0); |
75411d23 SH |
93 | } |
94 | ||
01979a98 SH |
95 | /** |
96 | * Update header in-place (does not rewrite backing filename or other strings) | |
97 | * | |
98 | * This function only updates known header fields in-place and does not affect | |
99 | * extra data after the QED header. | |
1f01e50b PB |
100 | * |
101 | * No new allocating reqs can start while this function runs. | |
01979a98 | 102 | */ |
87f0d882 | 103 | static int coroutine_fn qed_write_header(BDRVQEDState *s) |
01979a98 SH |
104 | { |
105 | /* We must write full sectors for O_DIRECT but cannot necessarily generate | |
106 | * the data following the header if an unrecognized compat feature is | |
107 | * active. Therefore, first read the sectors containing the header, update | |
108 | * them, and write back. | |
109 | */ | |
110 | ||
c41a73ff | 111 | int nsectors = DIV_ROUND_UP(sizeof(QEDHeader), BDRV_SECTOR_SIZE); |
01979a98 | 112 | size_t len = nsectors * BDRV_SECTOR_SIZE; |
7076309a | 113 | uint8_t *buf; |
7076309a KW |
114 | int ret; |
115 | ||
1f01e50b PB |
116 | assert(s->allocating_acb || s->allocating_write_reqs_plugged); |
117 | ||
7076309a | 118 | buf = qemu_blockalign(s->bs, len); |
7076309a | 119 | |
696e8cb2 | 120 | ret = bdrv_co_pread(s->bs->file, 0, len, buf, 0); |
7076309a KW |
121 | if (ret < 0) { |
122 | goto out; | |
123 | } | |
124 | ||
125 | /* Update header */ | |
126 | qed_header_cpu_to_le(&s->header, (QEDHeader *) buf); | |
127 | ||
696e8cb2 | 128 | ret = bdrv_co_pwrite(s->bs->file, 0, len, buf, 0); |
7076309a KW |
129 | if (ret < 0) { |
130 | goto out; | |
131 | } | |
132 | ||
133 | ret = 0; | |
134 | out: | |
135 | qemu_vfree(buf); | |
f13d712b | 136 | return ret; |
01979a98 SH |
137 | } |
138 | ||
75411d23 SH |
139 | static uint64_t qed_max_image_size(uint32_t cluster_size, uint32_t table_size) |
140 | { | |
141 | uint64_t table_entries; | |
142 | uint64_t l2_size; | |
143 | ||
144 | table_entries = (table_size * cluster_size) / sizeof(uint64_t); | |
145 | l2_size = table_entries * cluster_size; | |
146 | ||
147 | return l2_size * table_entries; | |
148 | } | |
149 | ||
150 | static bool qed_is_cluster_size_valid(uint32_t cluster_size) | |
151 | { | |
152 | if (cluster_size < QED_MIN_CLUSTER_SIZE || | |
153 | cluster_size > QED_MAX_CLUSTER_SIZE) { | |
154 | return false; | |
155 | } | |
156 | if (cluster_size & (cluster_size - 1)) { | |
157 | return false; /* not power of 2 */ | |
158 | } | |
159 | return true; | |
160 | } | |
161 | ||
162 | static bool qed_is_table_size_valid(uint32_t table_size) | |
163 | { | |
164 | if (table_size < QED_MIN_TABLE_SIZE || | |
165 | table_size > QED_MAX_TABLE_SIZE) { | |
166 | return false; | |
167 | } | |
168 | if (table_size & (table_size - 1)) { | |
169 | return false; /* not power of 2 */ | |
170 | } | |
171 | return true; | |
172 | } | |
173 | ||
174 | static bool qed_is_image_size_valid(uint64_t image_size, uint32_t cluster_size, | |
175 | uint32_t table_size) | |
176 | { | |
177 | if (image_size % BDRV_SECTOR_SIZE != 0) { | |
178 | return false; /* not multiple of sector size */ | |
179 | } | |
180 | if (image_size > qed_max_image_size(cluster_size, table_size)) { | |
181 | return false; /* image is too large */ | |
182 | } | |
183 | return true; | |
184 | } | |
185 | ||
186 | /** | |
187 | * Read a string of known length from the image file | |
188 | * | |
189 | * @file: Image file | |
190 | * @offset: File offset to start of string, in bytes | |
191 | * @n: String length in bytes | |
192 | * @buf: Destination buffer | |
193 | * @buflen: Destination buffer length in bytes | |
194 | * @ret: 0 on success, -errno on failure | |
195 | * | |
196 | * The string is NUL-terminated. | |
197 | */ | |
cf2ab8fc | 198 | static int qed_read_string(BdrvChild *file, uint64_t offset, size_t n, |
75411d23 SH |
199 | char *buf, size_t buflen) |
200 | { | |
201 | int ret; | |
202 | if (n >= buflen) { | |
203 | return -EINVAL; | |
204 | } | |
32cc71de | 205 | ret = bdrv_pread(file, offset, n, buf, 0); |
75411d23 SH |
206 | if (ret < 0) { |
207 | return ret; | |
208 | } | |
209 | buf[n] = '\0'; | |
210 | return 0; | |
211 | } | |
212 | ||
eabba580 SH |
213 | /** |
214 | * Allocate new clusters | |
215 | * | |
216 | * @s: QED state | |
217 | * @n: Number of contiguous clusters to allocate | |
218 | * @ret: Offset of first allocated cluster | |
219 | * | |
220 | * This function only produces the offset where the new clusters should be | |
221 | * written. It updates BDRVQEDState but does not make any changes to the image | |
222 | * file. | |
1f01e50b PB |
223 | * |
224 | * Called with table_lock held. | |
eabba580 SH |
225 | */ |
226 | static uint64_t qed_alloc_clusters(BDRVQEDState *s, unsigned int n) | |
227 | { | |
228 | uint64_t offset = s->file_size; | |
229 | s->file_size += n * s->header.cluster_size; | |
230 | return offset; | |
231 | } | |
232 | ||
298800ca SH |
233 | QEDTable *qed_alloc_table(BDRVQEDState *s) |
234 | { | |
235 | /* Honor O_DIRECT memory alignment requirements */ | |
236 | return qemu_blockalign(s->bs, | |
237 | s->header.cluster_size * s->header.table_size); | |
238 | } | |
239 | ||
eabba580 SH |
240 | /** |
241 | * Allocate a new zeroed L2 table | |
1f01e50b PB |
242 | * |
243 | * Called with table_lock held. | |
eabba580 SH |
244 | */ |
245 | static CachedL2Table *qed_new_l2_table(BDRVQEDState *s) | |
246 | { | |
247 | CachedL2Table *l2_table = qed_alloc_l2_cache_entry(&s->l2_cache); | |
248 | ||
249 | l2_table->table = qed_alloc_table(s); | |
250 | l2_table->offset = qed_alloc_clusters(s, s->header.table_size); | |
251 | ||
252 | memset(l2_table->table->offsets, 0, | |
253 | s->header.cluster_size * s->header.table_size); | |
254 | return l2_table; | |
255 | } | |
256 | ||
1f01e50b | 257 | static bool qed_plug_allocating_write_reqs(BDRVQEDState *s) |
6f321e93 | 258 | { |
1f01e50b PB |
259 | qemu_co_mutex_lock(&s->table_lock); |
260 | ||
261 | /* No reentrancy is allowed. */ | |
6f321e93 | 262 | assert(!s->allocating_write_reqs_plugged); |
1f01e50b PB |
263 | if (s->allocating_acb != NULL) { |
264 | /* Another allocating write came concurrently. This cannot happen | |
f8ea8dac | 265 | * from bdrv_qed_co_drain_begin, but it can happen when the timer runs. |
1f01e50b PB |
266 | */ |
267 | qemu_co_mutex_unlock(&s->table_lock); | |
268 | return false; | |
269 | } | |
6f321e93 SH |
270 | |
271 | s->allocating_write_reqs_plugged = true; | |
1f01e50b PB |
272 | qemu_co_mutex_unlock(&s->table_lock); |
273 | return true; | |
6f321e93 SH |
274 | } |
275 | ||
276 | static void qed_unplug_allocating_write_reqs(BDRVQEDState *s) | |
277 | { | |
1f01e50b | 278 | qemu_co_mutex_lock(&s->table_lock); |
6f321e93 | 279 | assert(s->allocating_write_reqs_plugged); |
6f321e93 | 280 | s->allocating_write_reqs_plugged = false; |
1f01e50b PB |
281 | qemu_co_queue_next(&s->allocating_write_reqs); |
282 | qemu_co_mutex_unlock(&s->table_lock); | |
6f321e93 SH |
283 | } |
284 | ||
87f0d882 | 285 | static void coroutine_fn qed_need_check_timer_entry(void *opaque) |
6f321e93 SH |
286 | { |
287 | BDRVQEDState *s = opaque; | |
c0e8f989 KW |
288 | int ret; |
289 | ||
c0e8f989 | 290 | trace_qed_need_check_timer_cb(s); |
6f321e93 | 291 | |
1f01e50b PB |
292 | if (!qed_plug_allocating_write_reqs(s)) { |
293 | return; | |
294 | } | |
c0e8f989 KW |
295 | |
296 | /* Ensure writes are on disk before clearing flag */ | |
297 | ret = bdrv_co_flush(s->bs->file->bs); | |
c0e8f989 | 298 | if (ret < 0) { |
6f321e93 SH |
299 | qed_unplug_allocating_write_reqs(s); |
300 | return; | |
301 | } | |
302 | ||
303 | s->header.features &= ~QED_F_NEED_CHECK; | |
f13d712b KW |
304 | ret = qed_write_header(s); |
305 | (void) ret; | |
306 | ||
307 | qed_unplug_allocating_write_reqs(s); | |
308 | ||
c0e8f989 | 309 | ret = bdrv_co_flush(s->bs); |
f13d712b | 310 | (void) ret; |
6f321e93 SH |
311 | } |
312 | ||
313 | static void qed_need_check_timer_cb(void *opaque) | |
314 | { | |
c0e8f989 KW |
315 | Coroutine *co = qemu_coroutine_create(qed_need_check_timer_entry, opaque); |
316 | qemu_coroutine_enter(co); | |
2f47da5f PB |
317 | } |
318 | ||
6f321e93 SH |
319 | static void qed_start_need_check_timer(BDRVQEDState *s) |
320 | { | |
321 | trace_qed_start_need_check_timer(s); | |
322 | ||
bc72ad67 | 323 | /* Use QEMU_CLOCK_VIRTUAL so we don't alter the image file while suspended for |
6f321e93 SH |
324 | * migration. |
325 | */ | |
bc72ad67 | 326 | timer_mod(s->need_check_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + |
73bcb24d | 327 | NANOSECONDS_PER_SECOND * QED_NEED_CHECK_TIMEOUT); |
6f321e93 SH |
328 | } |
329 | ||
330 | /* It's okay to call this multiple times or when no timer is started */ | |
331 | static void qed_cancel_need_check_timer(BDRVQEDState *s) | |
332 | { | |
333 | trace_qed_cancel_need_check_timer(s); | |
bc72ad67 | 334 | timer_del(s->need_check_timer); |
6f321e93 SH |
335 | } |
336 | ||
a8c868c3 SH |
337 | static void bdrv_qed_detach_aio_context(BlockDriverState *bs) |
338 | { | |
339 | BDRVQEDState *s = bs->opaque; | |
340 | ||
341 | qed_cancel_need_check_timer(s); | |
342 | timer_free(s->need_check_timer); | |
343 | } | |
344 | ||
345 | static void bdrv_qed_attach_aio_context(BlockDriverState *bs, | |
346 | AioContext *new_context) | |
347 | { | |
348 | BDRVQEDState *s = bs->opaque; | |
349 | ||
350 | s->need_check_timer = aio_timer_new(new_context, | |
351 | QEMU_CLOCK_VIRTUAL, SCALE_NS, | |
352 | qed_need_check_timer_cb, s); | |
353 | if (s->header.features & QED_F_NEED_CHECK) { | |
354 | qed_start_need_check_timer(s); | |
355 | } | |
356 | } | |
357 | ||
f8ea8dac | 358 | static void coroutine_fn bdrv_qed_co_drain_begin(BlockDriverState *bs) |
6653a73d FZ |
359 | { |
360 | BDRVQEDState *s = bs->opaque; | |
361 | ||
362 | /* Fire the timer immediately in order to start doing I/O as soon as the | |
363 | * header is flushed. | |
364 | */ | |
365 | if (s->need_check_timer && timer_pending(s->need_check_timer)) { | |
366 | qed_cancel_need_check_timer(s); | |
61124f03 | 367 | qed_need_check_timer_entry(s); |
6653a73d FZ |
368 | } |
369 | } | |
370 | ||
61c7887e PB |
371 | static void bdrv_qed_init_state(BlockDriverState *bs) |
372 | { | |
373 | BDRVQEDState *s = bs->opaque; | |
374 | ||
375 | memset(s, 0, sizeof(BDRVQEDState)); | |
376 | s->bs = bs; | |
1f01e50b | 377 | qemu_co_mutex_init(&s->table_lock); |
61c7887e PB |
378 | qemu_co_queue_init(&s->allocating_write_reqs); |
379 | } | |
380 | ||
9fb4dfc5 PB |
381 | /* Called with table_lock held. */ |
382 | static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options, | |
383 | int flags, Error **errp) | |
75411d23 SH |
384 | { |
385 | BDRVQEDState *s = bs->opaque; | |
386 | QEDHeader le_header; | |
387 | int64_t file_size; | |
388 | int ret; | |
389 | ||
32cc71de | 390 | ret = bdrv_pread(bs->file, 0, sizeof(le_header), &le_header, 0); |
75411d23 | 391 | if (ret < 0) { |
15ce94a6 | 392 | error_setg(errp, "Failed to read QED header"); |
75411d23 SH |
393 | return ret; |
394 | } | |
75411d23 SH |
395 | qed_header_le_to_cpu(&le_header, &s->header); |
396 | ||
397 | if (s->header.magic != QED_MAGIC) { | |
76abe407 PB |
398 | error_setg(errp, "Image not in QED format"); |
399 | return -EINVAL; | |
75411d23 SH |
400 | } |
401 | if (s->header.features & ~QED_FEATURE_MASK) { | |
10b758e8 | 402 | /* image uses unsupported feature bits */ |
a55448b3 HR |
403 | error_setg(errp, "Unsupported QED features: %" PRIx64, |
404 | s->header.features & ~QED_FEATURE_MASK); | |
10b758e8 | 405 | return -ENOTSUP; |
75411d23 SH |
406 | } |
407 | if (!qed_is_cluster_size_valid(s->header.cluster_size)) { | |
15ce94a6 | 408 | error_setg(errp, "QED cluster size is invalid"); |
75411d23 SH |
409 | return -EINVAL; |
410 | } | |
411 | ||
412 | /* Round down file size to the last cluster */ | |
9a4f4c31 | 413 | file_size = bdrv_getlength(bs->file->bs); |
75411d23 | 414 | if (file_size < 0) { |
15ce94a6 | 415 | error_setg(errp, "Failed to get file length"); |
75411d23 SH |
416 | return file_size; |
417 | } | |
418 | s->file_size = qed_start_of_cluster(s, file_size); | |
419 | ||
420 | if (!qed_is_table_size_valid(s->header.table_size)) { | |
15ce94a6 | 421 | error_setg(errp, "QED table size is invalid"); |
75411d23 SH |
422 | return -EINVAL; |
423 | } | |
424 | if (!qed_is_image_size_valid(s->header.image_size, | |
425 | s->header.cluster_size, | |
426 | s->header.table_size)) { | |
15ce94a6 | 427 | error_setg(errp, "QED image size is invalid"); |
75411d23 SH |
428 | return -EINVAL; |
429 | } | |
430 | if (!qed_check_table_offset(s, s->header.l1_table_offset)) { | |
15ce94a6 | 431 | error_setg(errp, "QED table offset is invalid"); |
75411d23 SH |
432 | return -EINVAL; |
433 | } | |
434 | ||
435 | s->table_nelems = (s->header.cluster_size * s->header.table_size) / | |
436 | sizeof(uint64_t); | |
786a4ea8 | 437 | s->l2_shift = ctz32(s->header.cluster_size); |
75411d23 | 438 | s->l2_mask = s->table_nelems - 1; |
786a4ea8 | 439 | s->l1_shift = s->l2_shift + ctz32(s->table_nelems); |
75411d23 | 440 | |
0adfa1ed SH |
441 | /* Header size calculation must not overflow uint32_t */ |
442 | if (s->header.header_size > UINT32_MAX / s->header.cluster_size) { | |
15ce94a6 | 443 | error_setg(errp, "QED header size is too large"); |
0adfa1ed SH |
444 | return -EINVAL; |
445 | } | |
446 | ||
75411d23 SH |
447 | if ((s->header.features & QED_F_BACKING_FILE)) { |
448 | if ((uint64_t)s->header.backing_filename_offset + | |
449 | s->header.backing_filename_size > | |
450 | s->header.cluster_size * s->header.header_size) { | |
15ce94a6 | 451 | error_setg(errp, "QED backing filename offset is invalid"); |
75411d23 SH |
452 | return -EINVAL; |
453 | } | |
454 | ||
cf2ab8fc | 455 | ret = qed_read_string(bs->file, s->header.backing_filename_offset, |
998c2019 HR |
456 | s->header.backing_filename_size, |
457 | bs->auto_backing_file, | |
458 | sizeof(bs->auto_backing_file)); | |
75411d23 | 459 | if (ret < 0) { |
15ce94a6 | 460 | error_setg(errp, "Failed to read backing filename"); |
75411d23 SH |
461 | return ret; |
462 | } | |
998c2019 HR |
463 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), |
464 | bs->auto_backing_file); | |
75411d23 SH |
465 | |
466 | if (s->header.features & QED_F_BACKING_FORMAT_NO_PROBE) { | |
467 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), "raw"); | |
468 | } | |
469 | } | |
470 | ||
471 | /* Reset unknown autoclear feature bits. This is a backwards | |
472 | * compatibility mechanism that allows images to be opened by older | |
473 | * programs, which "knock out" unknown feature bits. When an image is | |
474 | * opened by a newer program again it can detect that the autoclear | |
475 | * feature is no longer valid. | |
476 | */ | |
477 | if ((s->header.autoclear_features & ~QED_AUTOCLEAR_FEATURE_MASK) != 0 && | |
04c01a5c | 478 | !bdrv_is_read_only(bs->file->bs) && !(flags & BDRV_O_INACTIVE)) { |
75411d23 SH |
479 | s->header.autoclear_features &= QED_AUTOCLEAR_FEATURE_MASK; |
480 | ||
481 | ret = qed_write_header_sync(s); | |
482 | if (ret) { | |
15ce94a6 | 483 | error_setg(errp, "Failed to update header"); |
75411d23 SH |
484 | return ret; |
485 | } | |
486 | ||
487 | /* From here on only known autoclear feature bits are valid */ | |
9a4f4c31 | 488 | bdrv_flush(bs->file->bs); |
75411d23 SH |
489 | } |
490 | ||
298800ca SH |
491 | s->l1_table = qed_alloc_table(s); |
492 | qed_init_l2_cache(&s->l2_cache); | |
493 | ||
494 | ret = qed_read_l1_table_sync(s); | |
01979a98 | 495 | if (ret) { |
15ce94a6 | 496 | error_setg(errp, "Failed to read L1 table"); |
01979a98 SH |
497 | goto out; |
498 | } | |
499 | ||
500 | /* If image was not closed cleanly, check consistency */ | |
058f8f16 | 501 | if (!(flags & BDRV_O_CHECK) && (s->header.features & QED_F_NEED_CHECK)) { |
01979a98 SH |
502 | /* Read-only images cannot be fixed. There is no risk of corruption |
503 | * since write operations are not possible. Therefore, allow | |
504 | * potentially inconsistent images to be opened read-only. This can | |
505 | * aid data recovery from an otherwise inconsistent image. | |
506 | */ | |
9a4f4c31 | 507 | if (!bdrv_is_read_only(bs->file->bs) && |
04c01a5c | 508 | !(flags & BDRV_O_INACTIVE)) { |
01979a98 SH |
509 | BdrvCheckResult result = {0}; |
510 | ||
511 | ret = qed_check(s, &result, true); | |
6f321e93 | 512 | if (ret) { |
15ce94a6 | 513 | error_setg(errp, "Image corrupted"); |
6f321e93 SH |
514 | goto out; |
515 | } | |
01979a98 SH |
516 | } |
517 | } | |
518 | ||
a8c868c3 | 519 | bdrv_qed_attach_aio_context(bs, bdrv_get_aio_context(bs)); |
6f321e93 | 520 | |
01979a98 | 521 | out: |
298800ca SH |
522 | if (ret) { |
523 | qed_free_l2_cache(&s->l2_cache); | |
524 | qemu_vfree(s->l1_table); | |
525 | } | |
75411d23 SH |
526 | return ret; |
527 | } | |
528 | ||
9fb4dfc5 PB |
529 | typedef struct QEDOpenCo { |
530 | BlockDriverState *bs; | |
531 | QDict *options; | |
532 | int flags; | |
533 | Error **errp; | |
534 | int ret; | |
535 | } QEDOpenCo; | |
536 | ||
537 | static void coroutine_fn bdrv_qed_open_entry(void *opaque) | |
538 | { | |
539 | QEDOpenCo *qoc = opaque; | |
540 | BDRVQEDState *s = qoc->bs->opaque; | |
541 | ||
542 | qemu_co_mutex_lock(&s->table_lock); | |
543 | qoc->ret = bdrv_qed_do_open(qoc->bs, qoc->options, qoc->flags, qoc->errp); | |
544 | qemu_co_mutex_unlock(&s->table_lock); | |
545 | } | |
546 | ||
4e4bf5c4 KW |
547 | static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags, |
548 | Error **errp) | |
549 | { | |
9fb4dfc5 PB |
550 | QEDOpenCo qoc = { |
551 | .bs = bs, | |
552 | .options = options, | |
553 | .flags = flags, | |
554 | .errp = errp, | |
555 | .ret = -EINPROGRESS | |
556 | }; | |
557 | ||
8b1869da HR |
558 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds, |
559 | BDRV_CHILD_IMAGE, false, errp); | |
4e4bf5c4 KW |
560 | if (!bs->file) { |
561 | return -EINVAL; | |
562 | } | |
563 | ||
61c7887e | 564 | bdrv_qed_init_state(bs); |
9fb4dfc5 PB |
565 | if (qemu_in_coroutine()) { |
566 | bdrv_qed_open_entry(&qoc); | |
567 | } else { | |
4720cbee | 568 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); |
9fb4dfc5 PB |
569 | qemu_coroutine_enter(qemu_coroutine_create(bdrv_qed_open_entry, &qoc)); |
570 | BDRV_POLL_WHILE(bs, qoc.ret == -EINPROGRESS); | |
571 | } | |
572 | BDRV_POLL_WHILE(bs, qoc.ret == -EINPROGRESS); | |
573 | return qoc.ret; | |
4e4bf5c4 KW |
574 | } |
575 | ||
3baca891 | 576 | static void bdrv_qed_refresh_limits(BlockDriverState *bs, Error **errp) |
d34682cd KW |
577 | { |
578 | BDRVQEDState *s = bs->opaque; | |
579 | ||
cf081fca | 580 | bs->bl.pwrite_zeroes_alignment = s->header.cluster_size; |
f34b2bcf | 581 | bs->bl.max_pwrite_zeroes = QEMU_ALIGN_DOWN(INT_MAX, s->header.cluster_size); |
d34682cd KW |
582 | } |
583 | ||
f9cb20f1 JC |
584 | /* We have nothing to do for QED reopen, stubs just return |
585 | * success */ | |
586 | static int bdrv_qed_reopen_prepare(BDRVReopenState *state, | |
587 | BlockReopenQueue *queue, Error **errp) | |
588 | { | |
589 | return 0; | |
590 | } | |
591 | ||
75411d23 SH |
592 | static void bdrv_qed_close(BlockDriverState *bs) |
593 | { | |
298800ca SH |
594 | BDRVQEDState *s = bs->opaque; |
595 | ||
a8c868c3 | 596 | bdrv_qed_detach_aio_context(bs); |
6f321e93 | 597 | |
01979a98 | 598 | /* Ensure writes reach stable storage */ |
9a4f4c31 | 599 | bdrv_flush(bs->file->bs); |
01979a98 SH |
600 | |
601 | /* Clean shutdown, no check required on next open */ | |
602 | if (s->header.features & QED_F_NEED_CHECK) { | |
603 | s->header.features &= ~QED_F_NEED_CHECK; | |
604 | qed_write_header_sync(s); | |
605 | } | |
606 | ||
298800ca SH |
607 | qed_free_l2_cache(&s->l2_cache); |
608 | qemu_vfree(s->l1_table); | |
75411d23 SH |
609 | } |
610 | ||
959355a4 KW |
611 | static int coroutine_fn bdrv_qed_co_create(BlockdevCreateOptions *opts, |
612 | Error **errp) | |
75411d23 | 613 | { |
959355a4 KW |
614 | BlockdevCreateOptionsQed *qed_opts; |
615 | BlockBackend *blk = NULL; | |
616 | BlockDriverState *bs = NULL; | |
617 | ||
618 | QEDHeader header; | |
75411d23 SH |
619 | QEDHeader le_header; |
620 | uint8_t *l1_table = NULL; | |
959355a4 | 621 | size_t l1_size; |
75411d23 | 622 | int ret = 0; |
75411d23 | 623 | |
959355a4 KW |
624 | assert(opts->driver == BLOCKDEV_DRIVER_QED); |
625 | qed_opts = &opts->u.qed; | |
626 | ||
627 | /* Validate options and set default values */ | |
628 | if (!qed_opts->has_cluster_size) { | |
629 | qed_opts->cluster_size = QED_DEFAULT_CLUSTER_SIZE; | |
630 | } | |
631 | if (!qed_opts->has_table_size) { | |
632 | qed_opts->table_size = QED_DEFAULT_TABLE_SIZE; | |
75411d23 SH |
633 | } |
634 | ||
959355a4 KW |
635 | if (!qed_is_cluster_size_valid(qed_opts->cluster_size)) { |
636 | error_setg(errp, "QED cluster size must be within range [%u, %u] " | |
637 | "and power of 2", | |
638 | QED_MIN_CLUSTER_SIZE, QED_MAX_CLUSTER_SIZE); | |
639 | return -EINVAL; | |
640 | } | |
641 | if (!qed_is_table_size_valid(qed_opts->table_size)) { | |
642 | error_setg(errp, "QED table size must be within range [%u, %u] " | |
643 | "and power of 2", | |
644 | QED_MIN_TABLE_SIZE, QED_MAX_TABLE_SIZE); | |
645 | return -EINVAL; | |
646 | } | |
647 | if (!qed_is_image_size_valid(qed_opts->size, qed_opts->cluster_size, | |
648 | qed_opts->table_size)) | |
649 | { | |
650 | error_setg(errp, "QED image size must be a non-zero multiple of " | |
651 | "cluster size and less than %" PRIu64 " bytes", | |
652 | qed_max_image_size(qed_opts->cluster_size, | |
653 | qed_opts->table_size)); | |
654 | return -EINVAL; | |
655 | } | |
656 | ||
657 | /* Create BlockBackend to write to the image */ | |
658 | bs = bdrv_open_blockdev_ref(qed_opts->file, errp); | |
659 | if (bs == NULL) { | |
8a56fdad | 660 | return -EIO; |
75411d23 SH |
661 | } |
662 | ||
a3aeeab5 EB |
663 | blk = blk_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL, |
664 | errp); | |
665 | if (!blk) { | |
666 | ret = -EPERM; | |
959355a4 KW |
667 | goto out; |
668 | } | |
8a56fdad KW |
669 | blk_set_allow_write_beyond_eof(blk, true); |
670 | ||
959355a4 KW |
671 | /* Prepare image format */ |
672 | header = (QEDHeader) { | |
673 | .magic = QED_MAGIC, | |
674 | .cluster_size = qed_opts->cluster_size, | |
675 | .table_size = qed_opts->table_size, | |
676 | .header_size = 1, | |
677 | .features = 0, | |
678 | .compat_features = 0, | |
679 | .l1_table_offset = qed_opts->cluster_size, | |
680 | .image_size = qed_opts->size, | |
681 | }; | |
682 | ||
683 | l1_size = header.cluster_size * header.table_size; | |
684 | ||
e8d04f92 HR |
685 | /* |
686 | * The QED format associates file length with allocation status, | |
687 | * so a new file (which is empty) must have a length of 0. | |
688 | */ | |
8c6242b6 | 689 | ret = blk_truncate(blk, 0, true, PREALLOC_MODE_OFF, 0, errp); |
c743849b SH |
690 | if (ret < 0) { |
691 | goto out; | |
692 | } | |
693 | ||
959355a4 | 694 | if (qed_opts->has_backing_file) { |
75411d23 SH |
695 | header.features |= QED_F_BACKING_FILE; |
696 | header.backing_filename_offset = sizeof(le_header); | |
959355a4 | 697 | header.backing_filename_size = strlen(qed_opts->backing_file); |
75411d23 | 698 | |
959355a4 KW |
699 | if (qed_opts->has_backing_fmt) { |
700 | const char *backing_fmt = BlockdevDriver_str(qed_opts->backing_fmt); | |
701 | if (qed_fmt_is_raw(backing_fmt)) { | |
702 | header.features |= QED_F_BACKING_FORMAT_NO_PROBE; | |
703 | } | |
75411d23 SH |
704 | } |
705 | } | |
706 | ||
707 | qed_header_cpu_to_le(&header, &le_header); | |
8341f00d | 708 | ret = blk_pwrite(blk, 0, &le_header, sizeof(le_header), 0); |
75411d23 SH |
709 | if (ret < 0) { |
710 | goto out; | |
711 | } | |
959355a4 | 712 | ret = blk_pwrite(blk, sizeof(le_header), qed_opts->backing_file, |
8341f00d | 713 | header.backing_filename_size, 0); |
75411d23 SH |
714 | if (ret < 0) { |
715 | goto out; | |
716 | } | |
717 | ||
7267c094 | 718 | l1_table = g_malloc0(l1_size); |
8341f00d | 719 | ret = blk_pwrite(blk, header.l1_table_offset, l1_table, l1_size, 0); |
75411d23 SH |
720 | if (ret < 0) { |
721 | goto out; | |
722 | } | |
723 | ||
724 | ret = 0; /* success */ | |
725 | out: | |
7267c094 | 726 | g_free(l1_table); |
8a56fdad | 727 | blk_unref(blk); |
959355a4 | 728 | bdrv_unref(bs); |
75411d23 SH |
729 | return ret; |
730 | } | |
731 | ||
b92902df ML |
732 | static int coroutine_fn bdrv_qed_co_create_opts(BlockDriver *drv, |
733 | const char *filename, | |
efc75e2a SH |
734 | QemuOpts *opts, |
735 | Error **errp) | |
75411d23 | 736 | { |
959355a4 | 737 | BlockdevCreateOptions *create_options = NULL; |
92adf9db | 738 | QDict *qdict; |
959355a4 KW |
739 | Visitor *v; |
740 | BlockDriverState *bs = NULL; | |
7ab74849 CL |
741 | int ret; |
742 | ||
959355a4 KW |
743 | static const QDictRenames opt_renames[] = { |
744 | { BLOCK_OPT_BACKING_FILE, "backing-file" }, | |
745 | { BLOCK_OPT_BACKING_FMT, "backing-fmt" }, | |
746 | { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" }, | |
747 | { BLOCK_OPT_TABLE_SIZE, "table-size" }, | |
748 | { NULL, NULL }, | |
749 | }; | |
750 | ||
751 | /* Parse options and convert legacy syntax */ | |
752 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, &qed_create_opts, true); | |
753 | ||
754 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { | |
7ab74849 | 755 | ret = -EINVAL; |
959355a4 | 756 | goto fail; |
75411d23 | 757 | } |
959355a4 KW |
758 | |
759 | /* Create and open the file (protocol layer) */ | |
668f62ec | 760 | ret = bdrv_create_file(filename, opts, errp); |
959355a4 | 761 | if (ret < 0) { |
959355a4 KW |
762 | goto fail; |
763 | } | |
764 | ||
765 | bs = bdrv_open(filename, NULL, NULL, | |
766 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); | |
767 | if (bs == NULL) { | |
768 | ret = -EIO; | |
769 | goto fail; | |
770 | } | |
771 | ||
772 | /* Now get the QAPI type BlockdevCreateOptions */ | |
773 | qdict_put_str(qdict, "driver", "qed"); | |
774 | qdict_put_str(qdict, "file", bs->node_name); | |
775 | ||
af91062e MA |
776 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
777 | if (!v) { | |
7ab74849 | 778 | ret = -EINVAL; |
959355a4 | 779 | goto fail; |
75411d23 | 780 | } |
959355a4 | 781 | |
b11a093c | 782 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); |
959355a4 | 783 | visit_free(v); |
b11a093c | 784 | if (!create_options) { |
7ab74849 | 785 | ret = -EINVAL; |
959355a4 | 786 | goto fail; |
75411d23 SH |
787 | } |
788 | ||
959355a4 KW |
789 | /* Silently round up size */ |
790 | assert(create_options->driver == BLOCKDEV_DRIVER_QED); | |
791 | create_options->u.qed.size = | |
792 | ROUND_UP(create_options->u.qed.size, BDRV_SECTOR_SIZE); | |
793 | ||
794 | /* Create the qed image (format layer) */ | |
795 | ret = bdrv_qed_co_create(create_options, errp); | |
7ab74849 | 796 | |
959355a4 | 797 | fail: |
cb3e7f08 | 798 | qobject_unref(qdict); |
959355a4 KW |
799 | bdrv_unref(bs); |
800 | qapi_free_BlockdevCreateOptions(create_options); | |
7ab74849 | 801 | return ret; |
75411d23 SH |
802 | } |
803 | ||
b8d739fd EB |
804 | static int coroutine_fn bdrv_qed_co_block_status(BlockDriverState *bs, |
805 | bool want_zero, | |
806 | int64_t pos, int64_t bytes, | |
807 | int64_t *pnum, int64_t *map, | |
808 | BlockDriverState **file) | |
298800ca | 809 | { |
b8d739fd EB |
810 | BDRVQEDState *s = bs->opaque; |
811 | size_t len = MIN(bytes, SIZE_MAX); | |
812 | int status; | |
813 | QEDRequest request = { .l2_table = NULL }; | |
814 | uint64_t offset; | |
815 | int ret; | |
816 | ||
817 | qemu_co_mutex_lock(&s->table_lock); | |
818 | ret = qed_find_cluster(s, &request, pos, &len, &offset); | |
819 | ||
820 | *pnum = len; | |
4bc74be9 PB |
821 | switch (ret) { |
822 | case QED_CLUSTER_FOUND: | |
b8d739fd EB |
823 | *map = offset | qed_offset_into_cluster(s, pos); |
824 | status = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; | |
825 | *file = bs->file->bs; | |
4bc74be9 PB |
826 | break; |
827 | case QED_CLUSTER_ZERO: | |
b8d739fd | 828 | status = BDRV_BLOCK_ZERO; |
4bc74be9 PB |
829 | break; |
830 | case QED_CLUSTER_L2: | |
831 | case QED_CLUSTER_L1: | |
b8d739fd | 832 | status = 0; |
4bc74be9 PB |
833 | break; |
834 | default: | |
835 | assert(ret < 0); | |
b8d739fd | 836 | status = ret; |
4bc74be9 PB |
837 | break; |
838 | } | |
839 | ||
298800ca | 840 | qed_unref_l2_cache_entry(request.l2_table); |
1f01e50b | 841 | qemu_co_mutex_unlock(&s->table_lock); |
298800ca | 842 | |
b8d739fd | 843 | return status; |
75411d23 SH |
844 | } |
845 | ||
eabba580 SH |
846 | static BDRVQEDState *acb_to_s(QEDAIOCB *acb) |
847 | { | |
48cc565e | 848 | return acb->bs->opaque; |
eabba580 SH |
849 | } |
850 | ||
851 | /** | |
852 | * Read from the backing file or zero-fill if no backing file | |
853 | * | |
f06ee3d4 KW |
854 | * @s: QED state |
855 | * @pos: Byte position in device | |
856 | * @qiov: Destination I/O vector | |
eabba580 SH |
857 | * |
858 | * This function reads qiov->size bytes starting at pos from the backing file. | |
859 | * If there is no backing file then zeroes are read. | |
860 | */ | |
87f0d882 | 861 | static int coroutine_fn qed_read_backing_file(BDRVQEDState *s, uint64_t pos, |
365fed51 | 862 | QEMUIOVector *qiov) |
eabba580 | 863 | { |
760e0063 | 864 | if (s->bs->backing) { |
365fed51 EB |
865 | BLKDBG_EVENT(s->bs->file, BLKDBG_READ_BACKING_AIO); |
866 | return bdrv_co_preadv(s->bs->backing, pos, qiov->size, qiov, 0); | |
e85c5281 | 867 | } |
365fed51 | 868 | qemu_iovec_memset(qiov, 0, 0, qiov->size); |
e85c5281 | 869 | return 0; |
eabba580 SH |
870 | } |
871 | ||
eabba580 SH |
872 | /** |
873 | * Copy data from backing file into the image | |
874 | * | |
875 | * @s: QED state | |
876 | * @pos: Byte position in device | |
877 | * @len: Number of bytes | |
878 | * @offset: Byte offset in image file | |
eabba580 | 879 | */ |
87f0d882 KW |
880 | static int coroutine_fn qed_copy_from_backing_file(BDRVQEDState *s, |
881 | uint64_t pos, uint64_t len, | |
882 | uint64_t offset) | |
eabba580 | 883 | { |
0f7aa24d | 884 | QEMUIOVector qiov; |
e85c5281 | 885 | int ret; |
eabba580 SH |
886 | |
887 | /* Skip copy entirely if there is no work to do */ | |
888 | if (len == 0) { | |
b4ac32f3 | 889 | return 0; |
eabba580 SH |
890 | } |
891 | ||
342544f9 | 892 | qemu_iovec_init_buf(&qiov, qemu_blockalign(s->bs, len), len); |
0f7aa24d | 893 | |
365fed51 | 894 | ret = qed_read_backing_file(s, pos, &qiov); |
0f7aa24d KW |
895 | |
896 | if (ret) { | |
897 | goto out; | |
898 | } | |
eabba580 | 899 | |
0f7aa24d | 900 | BLKDBG_EVENT(s->bs->file, BLKDBG_COW_WRITE); |
0f714ec7 | 901 | ret = bdrv_co_pwritev(s->bs->file, offset, qiov.size, &qiov, 0); |
0f7aa24d KW |
902 | if (ret < 0) { |
903 | goto out; | |
904 | } | |
905 | ret = 0; | |
906 | out: | |
342544f9 | 907 | qemu_vfree(qemu_iovec_buf(&qiov)); |
b4ac32f3 | 908 | return ret; |
eabba580 SH |
909 | } |
910 | ||
911 | /** | |
912 | * Link one or more contiguous clusters into a table | |
913 | * | |
914 | * @s: QED state | |
915 | * @table: L2 table | |
916 | * @index: First cluster index | |
917 | * @n: Number of contiguous clusters | |
21df65b6 AL |
918 | * @cluster: First cluster offset |
919 | * | |
920 | * The cluster offset may be an allocated byte offset in the image file, the | |
921 | * zero cluster marker, or the unallocated cluster marker. | |
1f01e50b PB |
922 | * |
923 | * Called with table_lock held. | |
eabba580 | 924 | */ |
87f0d882 KW |
925 | static void coroutine_fn qed_update_l2_table(BDRVQEDState *s, QEDTable *table, |
926 | int index, unsigned int n, | |
927 | uint64_t cluster) | |
eabba580 SH |
928 | { |
929 | int i; | |
930 | for (i = index; i < index + n; i++) { | |
931 | table->offsets[i] = cluster; | |
21df65b6 AL |
932 | if (!qed_offset_is_unalloc_cluster(cluster) && |
933 | !qed_offset_is_zero_cluster(cluster)) { | |
934 | cluster += s->header.cluster_size; | |
935 | } | |
eabba580 SH |
936 | } |
937 | } | |
938 | ||
1f01e50b | 939 | /* Called with table_lock held. */ |
87f0d882 | 940 | static void coroutine_fn qed_aio_complete(QEDAIOCB *acb) |
eabba580 | 941 | { |
1919631e | 942 | BDRVQEDState *s = acb_to_s(acb); |
eabba580 SH |
943 | |
944 | /* Free resources */ | |
945 | qemu_iovec_destroy(&acb->cur_qiov); | |
946 | qed_unref_l2_cache_entry(acb->request.l2_table); | |
947 | ||
0e71be19 SH |
948 | /* Free the buffer we may have allocated for zero writes */ |
949 | if (acb->flags & QED_AIOCB_ZERO) { | |
950 | qemu_vfree(acb->qiov->iov[0].iov_base); | |
951 | acb->qiov->iov[0].iov_base = NULL; | |
952 | } | |
953 | ||
eabba580 SH |
954 | /* Start next allocating write request waiting behind this one. Note that |
955 | * requests enqueue themselves when they first hit an unallocated cluster | |
956 | * but they wait until the entire request is finished before waking up the | |
957 | * next request in the queue. This ensures that we don't cycle through | |
958 | * requests multiple times but rather finish one at a time completely. | |
959 | */ | |
0806c3b5 KW |
960 | if (acb == s->allocating_acb) { |
961 | s->allocating_acb = NULL; | |
962 | if (!qemu_co_queue_empty(&s->allocating_write_reqs)) { | |
1f01e50b | 963 | qemu_co_queue_next(&s->allocating_write_reqs); |
6f321e93 SH |
964 | } else if (s->header.features & QED_F_NEED_CHECK) { |
965 | qed_start_need_check_timer(s); | |
eabba580 SH |
966 | } |
967 | } | |
968 | } | |
969 | ||
970 | /** | |
fae25ac7 | 971 | * Update L1 table with new L2 table offset and write it out |
1f01e50b PB |
972 | * |
973 | * Called with table_lock held. | |
eabba580 | 974 | */ |
87f0d882 | 975 | static int coroutine_fn qed_aio_write_l1_update(QEDAIOCB *acb) |
eabba580 | 976 | { |
eabba580 SH |
977 | BDRVQEDState *s = acb_to_s(acb); |
978 | CachedL2Table *l2_table = acb->request.l2_table; | |
e4fc8781 | 979 | uint64_t l2_offset = l2_table->offset; |
fb18de21 | 980 | int index, ret; |
eabba580 | 981 | |
fae25ac7 KW |
982 | index = qed_l1_index(s, acb->cur_pos); |
983 | s->l1_table->offsets[index] = l2_table->offset; | |
984 | ||
985 | ret = qed_write_l1_table(s, index, 1); | |
986 | ||
987 | /* Commit the current L2 table to the cache */ | |
eabba580 SH |
988 | qed_commit_l2_cache_entry(&s->l2_cache, l2_table); |
989 | ||
990 | /* This is guaranteed to succeed because we just committed the entry to the | |
991 | * cache. | |
992 | */ | |
e4fc8781 | 993 | acb->request.l2_table = qed_find_l2_cache_entry(&s->l2_cache, l2_offset); |
eabba580 SH |
994 | assert(acb->request.l2_table != NULL); |
995 | ||
fb18de21 | 996 | return ret; |
eabba580 SH |
997 | } |
998 | ||
eabba580 SH |
999 | |
1000 | /** | |
1001 | * Update L2 table with new cluster offsets and write them out | |
1f01e50b PB |
1002 | * |
1003 | * Called with table_lock held. | |
eabba580 | 1004 | */ |
87f0d882 | 1005 | static int coroutine_fn qed_aio_write_l2_update(QEDAIOCB *acb, uint64_t offset) |
eabba580 | 1006 | { |
eabba580 SH |
1007 | BDRVQEDState *s = acb_to_s(acb); |
1008 | bool need_alloc = acb->find_cluster_ret == QED_CLUSTER_L1; | |
88d2dd72 | 1009 | int index, ret; |
eabba580 SH |
1010 | |
1011 | if (need_alloc) { | |
1012 | qed_unref_l2_cache_entry(acb->request.l2_table); | |
1013 | acb->request.l2_table = qed_new_l2_table(s); | |
1014 | } | |
1015 | ||
1016 | index = qed_l2_index(s, acb->cur_pos); | |
1017 | qed_update_l2_table(s, acb->request.l2_table->table, index, acb->cur_nclusters, | |
0e71be19 | 1018 | offset); |
eabba580 SH |
1019 | |
1020 | if (need_alloc) { | |
1021 | /* Write out the whole new L2 table */ | |
453e53e2 | 1022 | ret = qed_write_l2_table(s, &acb->request, 0, s->table_nelems, true); |
fb18de21 | 1023 | if (ret) { |
88d2dd72 | 1024 | return ret; |
fb18de21 | 1025 | } |
88d2dd72 | 1026 | return qed_aio_write_l1_update(acb); |
eabba580 SH |
1027 | } else { |
1028 | /* Write out only the updated part of the L2 table */ | |
453e53e2 KW |
1029 | ret = qed_write_l2_table(s, &acb->request, index, acb->cur_nclusters, |
1030 | false); | |
88d2dd72 KW |
1031 | if (ret) { |
1032 | return ret; | |
1033 | } | |
eabba580 | 1034 | } |
88d2dd72 | 1035 | return 0; |
eabba580 SH |
1036 | } |
1037 | ||
eabba580 SH |
1038 | /** |
1039 | * Write data to the image file | |
1f01e50b PB |
1040 | * |
1041 | * Called with table_lock *not* held. | |
eabba580 | 1042 | */ |
87f0d882 | 1043 | static int coroutine_fn qed_aio_write_main(QEDAIOCB *acb) |
eabba580 | 1044 | { |
eabba580 SH |
1045 | BDRVQEDState *s = acb_to_s(acb); |
1046 | uint64_t offset = acb->cur_cluster + | |
1047 | qed_offset_into_cluster(s, acb->cur_pos); | |
eabba580 | 1048 | |
eaf0bc56 | 1049 | trace_qed_aio_write_main(s, acb, 0, offset, acb->cur_qiov.size); |
eabba580 | 1050 | |
a4d8f1ae | 1051 | BLKDBG_EVENT(s->bs->file, BLKDBG_WRITE_AIO); |
e7569c18 PB |
1052 | return bdrv_co_pwritev(s->bs->file, offset, acb->cur_qiov.size, |
1053 | &acb->cur_qiov, 0); | |
eabba580 SH |
1054 | } |
1055 | ||
1056 | /** | |
b4ac32f3 | 1057 | * Populate untouched regions of new data cluster |
1f01e50b PB |
1058 | * |
1059 | * Called with table_lock held. | |
eabba580 | 1060 | */ |
87f0d882 | 1061 | static int coroutine_fn qed_aio_write_cow(QEDAIOCB *acb) |
eabba580 | 1062 | { |
eabba580 | 1063 | BDRVQEDState *s = acb_to_s(acb); |
b4ac32f3 | 1064 | uint64_t start, len, offset; |
a101341a | 1065 | int ret; |
eabba580 | 1066 | |
1f01e50b PB |
1067 | qemu_co_mutex_unlock(&s->table_lock); |
1068 | ||
b4ac32f3 KW |
1069 | /* Populate front untouched region of new data cluster */ |
1070 | start = qed_start_of_cluster(s, acb->cur_pos); | |
1071 | len = qed_offset_into_cluster(s, acb->cur_pos); | |
1072 | ||
1073 | trace_qed_aio_write_prefill(s, acb, start, len, acb->cur_cluster); | |
1074 | ret = qed_copy_from_backing_file(s, start, len, acb->cur_cluster); | |
a101341a | 1075 | if (ret < 0) { |
1f01e50b | 1076 | goto out; |
eabba580 SH |
1077 | } |
1078 | ||
b4ac32f3 KW |
1079 | /* Populate back untouched region of new data cluster */ |
1080 | start = acb->cur_pos + acb->cur_qiov.size; | |
1081 | len = qed_start_of_cluster(s, start + s->header.cluster_size - 1) - start; | |
1082 | offset = acb->cur_cluster + | |
1083 | qed_offset_into_cluster(s, acb->cur_pos) + | |
1084 | acb->cur_qiov.size; | |
eabba580 | 1085 | |
b4ac32f3 KW |
1086 | trace_qed_aio_write_postfill(s, acb, start, len, offset); |
1087 | ret = qed_copy_from_backing_file(s, start, len, offset); | |
eaf0bc56 | 1088 | if (ret < 0) { |
1f01e50b | 1089 | goto out; |
eaf0bc56 | 1090 | } |
a101341a | 1091 | |
e7569c18 PB |
1092 | ret = qed_aio_write_main(acb); |
1093 | if (ret < 0) { | |
1f01e50b | 1094 | goto out; |
e7569c18 PB |
1095 | } |
1096 | ||
1097 | if (s->bs->backing) { | |
1098 | /* | |
1099 | * Flush new data clusters before updating the L2 table | |
1100 | * | |
1101 | * This flush is necessary when a backing file is in use. A crash | |
1102 | * during an allocating write could result in empty clusters in the | |
1103 | * image. If the write only touched a subregion of the cluster, | |
1104 | * then backing image sectors have been lost in the untouched | |
1105 | * region. The solution is to flush after writing a new data | |
1106 | * cluster and before updating the L2 table. | |
1107 | */ | |
1108 | ret = bdrv_co_flush(s->bs->file->bs); | |
e7569c18 PB |
1109 | } |
1110 | ||
1f01e50b PB |
1111 | out: |
1112 | qemu_co_mutex_lock(&s->table_lock); | |
1113 | return ret; | |
eabba580 SH |
1114 | } |
1115 | ||
0d09c797 SH |
1116 | /** |
1117 | * Check if the QED_F_NEED_CHECK bit should be set during allocating write | |
1118 | */ | |
1119 | static bool qed_should_set_need_check(BDRVQEDState *s) | |
1120 | { | |
1121 | /* The flush before L2 update path ensures consistency */ | |
760e0063 | 1122 | if (s->bs->backing) { |
0d09c797 SH |
1123 | return false; |
1124 | } | |
1125 | ||
1126 | return !(s->header.features & QED_F_NEED_CHECK); | |
1127 | } | |
1128 | ||
eabba580 SH |
1129 | /** |
1130 | * Write new data cluster | |
1131 | * | |
1132 | * @acb: Write request | |
1133 | * @len: Length in bytes | |
1134 | * | |
1135 | * This path is taken when writing to previously unallocated clusters. | |
1f01e50b PB |
1136 | * |
1137 | * Called with table_lock held. | |
eabba580 | 1138 | */ |
87f0d882 | 1139 | static int coroutine_fn qed_aio_write_alloc(QEDAIOCB *acb, size_t len) |
eabba580 SH |
1140 | { |
1141 | BDRVQEDState *s = acb_to_s(acb); | |
f13d712b | 1142 | int ret; |
eabba580 | 1143 | |
6f321e93 | 1144 | /* Cancel timer when the first allocating request comes in */ |
0806c3b5 | 1145 | if (s->allocating_acb == NULL) { |
6f321e93 SH |
1146 | qed_cancel_need_check_timer(s); |
1147 | } | |
1148 | ||
eabba580 | 1149 | /* Freeze this request if another allocating write is in progress */ |
0806c3b5 KW |
1150 | if (s->allocating_acb != acb || s->allocating_write_reqs_plugged) { |
1151 | if (s->allocating_acb != NULL) { | |
1f01e50b | 1152 | qemu_co_queue_wait(&s->allocating_write_reqs, &s->table_lock); |
0806c3b5 KW |
1153 | assert(s->allocating_acb == NULL); |
1154 | } | |
1155 | s->allocating_acb = acb; | |
1156 | return -EAGAIN; /* start over with looking up table entries */ | |
eabba580 SH |
1157 | } |
1158 | ||
1159 | acb->cur_nclusters = qed_bytes_to_clusters(s, | |
1160 | qed_offset_into_cluster(s, acb->cur_pos) + len); | |
1b093c48 | 1161 | qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len); |
eabba580 | 1162 | |
0e71be19 SH |
1163 | if (acb->flags & QED_AIOCB_ZERO) { |
1164 | /* Skip ahead if the clusters are already zero */ | |
1165 | if (acb->find_cluster_ret == QED_CLUSTER_ZERO) { | |
d6daddcd | 1166 | return 0; |
0e71be19 | 1167 | } |
e7569c18 | 1168 | acb->cur_cluster = 1; |
0e71be19 | 1169 | } else { |
0e71be19 SH |
1170 | acb->cur_cluster = qed_alloc_clusters(s, acb->cur_nclusters); |
1171 | } | |
1172 | ||
0d09c797 SH |
1173 | if (qed_should_set_need_check(s)) { |
1174 | s->header.features |= QED_F_NEED_CHECK; | |
f13d712b | 1175 | ret = qed_write_header(s); |
a101341a | 1176 | if (ret < 0) { |
d6daddcd | 1177 | return ret; |
a101341a KW |
1178 | } |
1179 | } | |
1180 | ||
e7569c18 | 1181 | if (!(acb->flags & QED_AIOCB_ZERO)) { |
a101341a | 1182 | ret = qed_aio_write_cow(acb); |
e7569c18 PB |
1183 | if (ret < 0) { |
1184 | return ret; | |
1185 | } | |
01979a98 | 1186 | } |
e7569c18 PB |
1187 | |
1188 | return qed_aio_write_l2_update(acb, acb->cur_cluster); | |
eabba580 SH |
1189 | } |
1190 | ||
1191 | /** | |
1192 | * Write data cluster in place | |
1193 | * | |
1194 | * @acb: Write request | |
1195 | * @offset: Cluster offset in bytes | |
1196 | * @len: Length in bytes | |
1197 | * | |
1198 | * This path is taken when writing to already allocated clusters. | |
1f01e50b PB |
1199 | * |
1200 | * Called with table_lock held. | |
eabba580 | 1201 | */ |
87f0d882 KW |
1202 | static int coroutine_fn qed_aio_write_inplace(QEDAIOCB *acb, uint64_t offset, |
1203 | size_t len) | |
eabba580 | 1204 | { |
1f01e50b PB |
1205 | BDRVQEDState *s = acb_to_s(acb); |
1206 | int r; | |
1207 | ||
1208 | qemu_co_mutex_unlock(&s->table_lock); | |
1209 | ||
0e71be19 SH |
1210 | /* Allocate buffer for zero writes */ |
1211 | if (acb->flags & QED_AIOCB_ZERO) { | |
1212 | struct iovec *iov = acb->qiov->iov; | |
1213 | ||
1214 | if (!iov->iov_base) { | |
48cc565e | 1215 | iov->iov_base = qemu_try_blockalign(acb->bs, iov->iov_len); |
4f4896db | 1216 | if (iov->iov_base == NULL) { |
1f01e50b PB |
1217 | r = -ENOMEM; |
1218 | goto out; | |
4f4896db | 1219 | } |
0e71be19 SH |
1220 | memset(iov->iov_base, 0, iov->iov_len); |
1221 | } | |
1222 | } | |
1223 | ||
eabba580 SH |
1224 | /* Calculate the I/O vector */ |
1225 | acb->cur_cluster = offset; | |
1b093c48 | 1226 | qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len); |
eabba580 | 1227 | |
1f01e50b PB |
1228 | /* Do the actual write. */ |
1229 | r = qed_aio_write_main(acb); | |
1230 | out: | |
1231 | qemu_co_mutex_lock(&s->table_lock); | |
1232 | return r; | |
eabba580 SH |
1233 | } |
1234 | ||
1235 | /** | |
1236 | * Write data cluster | |
1237 | * | |
1238 | * @opaque: Write request | |
0596be7e | 1239 | * @ret: QED_CLUSTER_FOUND, QED_CLUSTER_L2 or QED_CLUSTER_L1 |
eabba580 SH |
1240 | * @offset: Cluster offset in bytes |
1241 | * @len: Length in bytes | |
1f01e50b PB |
1242 | * |
1243 | * Called with table_lock held. | |
eabba580 | 1244 | */ |
87f0d882 KW |
1245 | static int coroutine_fn qed_aio_write_data(void *opaque, int ret, |
1246 | uint64_t offset, size_t len) | |
eabba580 SH |
1247 | { |
1248 | QEDAIOCB *acb = opaque; | |
1249 | ||
1250 | trace_qed_aio_write_data(acb_to_s(acb), acb, ret, offset, len); | |
1251 | ||
1252 | acb->find_cluster_ret = ret; | |
1253 | ||
1254 | switch (ret) { | |
1255 | case QED_CLUSTER_FOUND: | |
0596be7e | 1256 | return qed_aio_write_inplace(acb, offset, len); |
eabba580 SH |
1257 | |
1258 | case QED_CLUSTER_L2: | |
1259 | case QED_CLUSTER_L1: | |
21df65b6 | 1260 | case QED_CLUSTER_ZERO: |
0596be7e | 1261 | return qed_aio_write_alloc(acb, len); |
eabba580 SH |
1262 | |
1263 | default: | |
0596be7e | 1264 | g_assert_not_reached(); |
d6daddcd | 1265 | } |
eabba580 SH |
1266 | } |
1267 | ||
1268 | /** | |
1269 | * Read data cluster | |
1270 | * | |
1271 | * @opaque: Read request | |
0596be7e | 1272 | * @ret: QED_CLUSTER_FOUND, QED_CLUSTER_L2 or QED_CLUSTER_L1 |
eabba580 SH |
1273 | * @offset: Cluster offset in bytes |
1274 | * @len: Length in bytes | |
1f01e50b PB |
1275 | * |
1276 | * Called with table_lock held. | |
eabba580 | 1277 | */ |
87f0d882 KW |
1278 | static int coroutine_fn qed_aio_read_data(void *opaque, int ret, |
1279 | uint64_t offset, size_t len) | |
eabba580 SH |
1280 | { |
1281 | QEDAIOCB *acb = opaque; | |
1282 | BDRVQEDState *s = acb_to_s(acb); | |
48cc565e | 1283 | BlockDriverState *bs = acb->bs; |
1f01e50b PB |
1284 | int r; |
1285 | ||
1286 | qemu_co_mutex_unlock(&s->table_lock); | |
eabba580 SH |
1287 | |
1288 | /* Adjust offset into cluster */ | |
1289 | offset += qed_offset_into_cluster(s, acb->cur_pos); | |
1290 | ||
1291 | trace_qed_aio_read_data(s, acb, ret, offset, len); | |
1292 | ||
1b093c48 | 1293 | qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len); |
eabba580 | 1294 | |
1f01e50b PB |
1295 | /* Handle zero cluster and backing file reads, otherwise read |
1296 | * data cluster directly. | |
1297 | */ | |
21df65b6 | 1298 | if (ret == QED_CLUSTER_ZERO) { |
3d9b4925 | 1299 | qemu_iovec_memset(&acb->cur_qiov, 0, 0, acb->cur_qiov.size); |
1f01e50b | 1300 | r = 0; |
21df65b6 | 1301 | } else if (ret != QED_CLUSTER_FOUND) { |
365fed51 | 1302 | r = qed_read_backing_file(s, acb->cur_pos, &acb->cur_qiov); |
1f01e50b PB |
1303 | } else { |
1304 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
1305 | r = bdrv_co_preadv(bs->file, offset, acb->cur_qiov.size, | |
1306 | &acb->cur_qiov, 0); | |
eabba580 SH |
1307 | } |
1308 | ||
1f01e50b PB |
1309 | qemu_co_mutex_lock(&s->table_lock); |
1310 | return r; | |
eabba580 SH |
1311 | } |
1312 | ||
1313 | /** | |
1314 | * Begin next I/O or complete the request | |
1315 | */ | |
87f0d882 | 1316 | static int coroutine_fn qed_aio_next_io(QEDAIOCB *acb) |
eabba580 | 1317 | { |
eabba580 | 1318 | BDRVQEDState *s = acb_to_s(acb); |
0f21b7a1 KW |
1319 | uint64_t offset; |
1320 | size_t len; | |
dddf8db1 | 1321 | int ret; |
eabba580 | 1322 | |
1f01e50b | 1323 | qemu_co_mutex_lock(&s->table_lock); |
01859874 KW |
1324 | while (1) { |
1325 | trace_qed_aio_next_io(s, acb, 0, acb->cur_pos + acb->cur_qiov.size); | |
eabba580 | 1326 | |
01859874 KW |
1327 | acb->qiov_offset += acb->cur_qiov.size; |
1328 | acb->cur_pos += acb->cur_qiov.size; | |
1329 | qemu_iovec_reset(&acb->cur_qiov); | |
eabba580 | 1330 | |
01859874 KW |
1331 | /* Complete request */ |
1332 | if (acb->cur_pos >= acb->end_pos) { | |
48cc565e KW |
1333 | ret = 0; |
1334 | break; | |
01859874 | 1335 | } |
eabba580 | 1336 | |
01859874 KW |
1337 | /* Find next cluster and start I/O */ |
1338 | len = acb->end_pos - acb->cur_pos; | |
1339 | ret = qed_find_cluster(s, &acb->request, acb->cur_pos, &len, &offset); | |
1340 | if (ret < 0) { | |
48cc565e | 1341 | break; |
01859874 | 1342 | } |
0596be7e | 1343 | |
01859874 KW |
1344 | if (acb->flags & QED_AIOCB_WRITE) { |
1345 | ret = qed_aio_write_data(acb, ret, offset, len); | |
1346 | } else { | |
1347 | ret = qed_aio_read_data(acb, ret, offset, len); | |
1348 | } | |
0596be7e | 1349 | |
0806c3b5 | 1350 | if (ret < 0 && ret != -EAGAIN) { |
48cc565e | 1351 | break; |
0596be7e | 1352 | } |
0596be7e | 1353 | } |
eabba580 | 1354 | |
48cc565e KW |
1355 | trace_qed_aio_complete(s, acb, ret); |
1356 | qed_aio_complete(acb); | |
1f01e50b | 1357 | qemu_co_mutex_unlock(&s->table_lock); |
48cc565e | 1358 | return ret; |
89f89709 KW |
1359 | } |
1360 | ||
1361 | static int coroutine_fn qed_co_request(BlockDriverState *bs, int64_t sector_num, | |
1362 | QEMUIOVector *qiov, int nb_sectors, | |
1363 | int flags) | |
1364 | { | |
48cc565e KW |
1365 | QEDAIOCB acb = { |
1366 | .bs = bs, | |
1367 | .cur_pos = (uint64_t) sector_num * BDRV_SECTOR_SIZE, | |
1368 | .end_pos = (sector_num + nb_sectors) * BDRV_SECTOR_SIZE, | |
1369 | .qiov = qiov, | |
1370 | .flags = flags, | |
89f89709 | 1371 | }; |
48cc565e | 1372 | qemu_iovec_init(&acb.cur_qiov, qiov->niov); |
eabba580 | 1373 | |
48cc565e | 1374 | trace_qed_aio_setup(bs->opaque, &acb, sector_num, nb_sectors, NULL, flags); |
eabba580 SH |
1375 | |
1376 | /* Start request */ | |
48cc565e | 1377 | return qed_aio_next_io(&acb); |
75411d23 SH |
1378 | } |
1379 | ||
89f89709 KW |
1380 | static int coroutine_fn bdrv_qed_co_readv(BlockDriverState *bs, |
1381 | int64_t sector_num, int nb_sectors, | |
1382 | QEMUIOVector *qiov) | |
75411d23 | 1383 | { |
89f89709 | 1384 | return qed_co_request(bs, sector_num, qiov, nb_sectors, 0); |
75411d23 SH |
1385 | } |
1386 | ||
89f89709 KW |
1387 | static int coroutine_fn bdrv_qed_co_writev(BlockDriverState *bs, |
1388 | int64_t sector_num, int nb_sectors, | |
e18a58b4 | 1389 | QEMUIOVector *qiov, int flags) |
0e71be19 | 1390 | { |
e18a58b4 | 1391 | assert(!flags); |
89f89709 | 1392 | return qed_co_request(bs, sector_num, qiov, nb_sectors, QED_AIOCB_WRITE); |
0e71be19 SH |
1393 | } |
1394 | ||
49a2e483 EB |
1395 | static int coroutine_fn bdrv_qed_co_pwrite_zeroes(BlockDriverState *bs, |
1396 | int64_t offset, | |
f34b2bcf | 1397 | int64_t bytes, |
49a2e483 | 1398 | BdrvRequestFlags flags) |
0e71be19 | 1399 | { |
ef72f76e | 1400 | BDRVQEDState *s = bs->opaque; |
342544f9 VSO |
1401 | |
1402 | /* | |
1403 | * Zero writes start without an I/O buffer. If a buffer becomes necessary | |
1404 | * then it will be allocated during request processing. | |
1405 | */ | |
1406 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, NULL, bytes); | |
0e71be19 | 1407 | |
f34b2bcf VSO |
1408 | /* |
1409 | * QED is not prepared for 63bit write-zero requests, so rely on | |
1410 | * max_pwrite_zeroes. | |
1411 | */ | |
1412 | assert(bytes <= INT_MAX); | |
1413 | ||
49a2e483 EB |
1414 | /* Fall back if the request is not aligned */ |
1415 | if (qed_offset_into_cluster(s, offset) || | |
f5a5ca79 | 1416 | qed_offset_into_cluster(s, bytes)) { |
49a2e483 | 1417 | return -ENOTSUP; |
ef72f76e SH |
1418 | } |
1419 | ||
89f89709 | 1420 | return qed_co_request(bs, offset >> BDRV_SECTOR_BITS, &qiov, |
f5a5ca79 | 1421 | bytes >> BDRV_SECTOR_BITS, |
89f89709 | 1422 | QED_AIOCB_WRITE | QED_AIOCB_ZERO); |
0e71be19 SH |
1423 | } |
1424 | ||
061ca8a3 KW |
1425 | static int coroutine_fn bdrv_qed_co_truncate(BlockDriverState *bs, |
1426 | int64_t offset, | |
c80d8b06 | 1427 | bool exact, |
061ca8a3 | 1428 | PreallocMode prealloc, |
92b92799 | 1429 | BdrvRequestFlags flags, |
061ca8a3 | 1430 | Error **errp) |
75411d23 | 1431 | { |
77a5a000 SH |
1432 | BDRVQEDState *s = bs->opaque; |
1433 | uint64_t old_image_size; | |
1434 | int ret; | |
1435 | ||
8243ccb7 HR |
1436 | if (prealloc != PREALLOC_MODE_OFF) { |
1437 | error_setg(errp, "Unsupported preallocation mode '%s'", | |
977c736f | 1438 | PreallocMode_str(prealloc)); |
8243ccb7 HR |
1439 | return -ENOTSUP; |
1440 | } | |
1441 | ||
77a5a000 SH |
1442 | if (!qed_is_image_size_valid(offset, s->header.cluster_size, |
1443 | s->header.table_size)) { | |
f59adb32 | 1444 | error_setg(errp, "Invalid image size specified"); |
77a5a000 SH |
1445 | return -EINVAL; |
1446 | } | |
1447 | ||
77a5a000 | 1448 | if ((uint64_t)offset < s->header.image_size) { |
f59adb32 | 1449 | error_setg(errp, "Shrinking images is currently not supported"); |
77a5a000 SH |
1450 | return -ENOTSUP; |
1451 | } | |
1452 | ||
1453 | old_image_size = s->header.image_size; | |
1454 | s->header.image_size = offset; | |
1455 | ret = qed_write_header_sync(s); | |
1456 | if (ret < 0) { | |
1457 | s->header.image_size = old_image_size; | |
f59adb32 | 1458 | error_setg_errno(errp, -ret, "Failed to update the image size"); |
77a5a000 SH |
1459 | } |
1460 | return ret; | |
75411d23 SH |
1461 | } |
1462 | ||
1463 | static int64_t bdrv_qed_getlength(BlockDriverState *bs) | |
1464 | { | |
1465 | BDRVQEDState *s = bs->opaque; | |
1466 | return s->header.image_size; | |
1467 | } | |
1468 | ||
1469 | static int bdrv_qed_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
1470 | { | |
1471 | BDRVQEDState *s = bs->opaque; | |
1472 | ||
1473 | memset(bdi, 0, sizeof(*bdi)); | |
1474 | bdi->cluster_size = s->header.cluster_size; | |
d68dbee8 | 1475 | bdi->is_dirty = s->header.features & QED_F_NEED_CHECK; |
75411d23 SH |
1476 | return 0; |
1477 | } | |
1478 | ||
1479 | static int bdrv_qed_change_backing_file(BlockDriverState *bs, | |
1480 | const char *backing_file, | |
1481 | const char *backing_fmt) | |
1482 | { | |
1483 | BDRVQEDState *s = bs->opaque; | |
1484 | QEDHeader new_header, le_header; | |
1485 | void *buffer; | |
1486 | size_t buffer_len, backing_file_len; | |
1487 | int ret; | |
1488 | ||
1489 | /* Refuse to set backing filename if unknown compat feature bits are | |
1490 | * active. If the image uses an unknown compat feature then we may not | |
1491 | * know the layout of data following the header structure and cannot safely | |
1492 | * add a new string. | |
1493 | */ | |
1494 | if (backing_file && (s->header.compat_features & | |
1495 | ~QED_COMPAT_FEATURE_MASK)) { | |
1496 | return -ENOTSUP; | |
1497 | } | |
1498 | ||
1499 | memcpy(&new_header, &s->header, sizeof(new_header)); | |
1500 | ||
1501 | new_header.features &= ~(QED_F_BACKING_FILE | | |
1502 | QED_F_BACKING_FORMAT_NO_PROBE); | |
1503 | ||
1504 | /* Adjust feature flags */ | |
1505 | if (backing_file) { | |
1506 | new_header.features |= QED_F_BACKING_FILE; | |
1507 | ||
1508 | if (qed_fmt_is_raw(backing_fmt)) { | |
1509 | new_header.features |= QED_F_BACKING_FORMAT_NO_PROBE; | |
1510 | } | |
1511 | } | |
1512 | ||
1513 | /* Calculate new header size */ | |
1514 | backing_file_len = 0; | |
1515 | ||
1516 | if (backing_file) { | |
1517 | backing_file_len = strlen(backing_file); | |
1518 | } | |
1519 | ||
1520 | buffer_len = sizeof(new_header); | |
1521 | new_header.backing_filename_offset = buffer_len; | |
1522 | new_header.backing_filename_size = backing_file_len; | |
1523 | buffer_len += backing_file_len; | |
1524 | ||
1525 | /* Make sure we can rewrite header without failing */ | |
1526 | if (buffer_len > new_header.header_size * new_header.cluster_size) { | |
1527 | return -ENOSPC; | |
1528 | } | |
1529 | ||
1530 | /* Prepare new header */ | |
7267c094 | 1531 | buffer = g_malloc(buffer_len); |
75411d23 SH |
1532 | |
1533 | qed_header_cpu_to_le(&new_header, &le_header); | |
1534 | memcpy(buffer, &le_header, sizeof(le_header)); | |
1535 | buffer_len = sizeof(le_header); | |
1536 | ||
feba23b1 PB |
1537 | if (backing_file) { |
1538 | memcpy(buffer + buffer_len, backing_file, backing_file_len); | |
1539 | buffer_len += backing_file_len; | |
1540 | } | |
75411d23 SH |
1541 | |
1542 | /* Write new header */ | |
32cc71de | 1543 | ret = bdrv_pwrite_sync(bs->file, 0, buffer_len, buffer, 0); |
7267c094 | 1544 | g_free(buffer); |
75411d23 SH |
1545 | if (ret == 0) { |
1546 | memcpy(&s->header, &new_header, sizeof(new_header)); | |
1547 | } | |
1548 | return ret; | |
1549 | } | |
1550 | ||
2b148f39 PB |
1551 | static void coroutine_fn bdrv_qed_co_invalidate_cache(BlockDriverState *bs, |
1552 | Error **errp) | |
c82954e5 | 1553 | { |
1f01e50b | 1554 | BDRVQEDState *s = bs->opaque; |
5a8a30db | 1555 | int ret; |
c82954e5 BC |
1556 | |
1557 | bdrv_qed_close(bs); | |
3456a8d1 | 1558 | |
61c7887e | 1559 | bdrv_qed_init_state(bs); |
2b148f39 | 1560 | qemu_co_mutex_lock(&s->table_lock); |
15ce94a6 | 1561 | ret = bdrv_qed_do_open(bs, NULL, bs->open_flags, errp); |
2b148f39 | 1562 | qemu_co_mutex_unlock(&s->table_lock); |
15ce94a6 VSO |
1563 | if (ret < 0) { |
1564 | error_prepend(errp, "Could not reopen qed layer: "); | |
5a8a30db | 1565 | } |
c82954e5 BC |
1566 | } |
1567 | ||
54277a2a VSO |
1568 | static int coroutine_fn bdrv_qed_co_check(BlockDriverState *bs, |
1569 | BdrvCheckResult *result, | |
1570 | BdrvCheckMode fix) | |
75411d23 | 1571 | { |
01979a98 | 1572 | BDRVQEDState *s = bs->opaque; |
2fd61638 | 1573 | int ret; |
01979a98 | 1574 | |
2fd61638 PB |
1575 | qemu_co_mutex_lock(&s->table_lock); |
1576 | ret = qed_check(s, result, !!fix); | |
1577 | qemu_co_mutex_unlock(&s->table_lock); | |
1578 | ||
1579 | return ret; | |
75411d23 SH |
1580 | } |
1581 | ||
7ab74849 CL |
1582 | static QemuOptsList qed_create_opts = { |
1583 | .name = "qed-create-opts", | |
1584 | .head = QTAILQ_HEAD_INITIALIZER(qed_create_opts.head), | |
1585 | .desc = { | |
1586 | { | |
1587 | .name = BLOCK_OPT_SIZE, | |
1588 | .type = QEMU_OPT_SIZE, | |
1589 | .help = "Virtual disk size" | |
1590 | }, | |
1591 | { | |
1592 | .name = BLOCK_OPT_BACKING_FILE, | |
1593 | .type = QEMU_OPT_STRING, | |
1594 | .help = "File name of a base image" | |
1595 | }, | |
1596 | { | |
1597 | .name = BLOCK_OPT_BACKING_FMT, | |
1598 | .type = QEMU_OPT_STRING, | |
1599 | .help = "Image format of the base image" | |
1600 | }, | |
1601 | { | |
1602 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
1603 | .type = QEMU_OPT_SIZE, | |
1604 | .help = "Cluster size (in bytes)", | |
1605 | .def_value_str = stringify(QED_DEFAULT_CLUSTER_SIZE) | |
1606 | }, | |
1607 | { | |
1608 | .name = BLOCK_OPT_TABLE_SIZE, | |
1609 | .type = QEMU_OPT_SIZE, | |
1610 | .help = "L1/L2 table size (in clusters)" | |
1611 | }, | |
1612 | { /* end of list */ } | |
1613 | } | |
75411d23 SH |
1614 | }; |
1615 | ||
1616 | static BlockDriver bdrv_qed = { | |
1617 | .format_name = "qed", | |
1618 | .instance_size = sizeof(BDRVQEDState), | |
7ab74849 | 1619 | .create_opts = &qed_create_opts, |
d67066d8 | 1620 | .is_format = true, |
8ee79e70 | 1621 | .supports_backing = true, |
75411d23 SH |
1622 | |
1623 | .bdrv_probe = bdrv_qed_probe, | |
1624 | .bdrv_open = bdrv_qed_open, | |
1625 | .bdrv_close = bdrv_qed_close, | |
f9cb20f1 | 1626 | .bdrv_reopen_prepare = bdrv_qed_reopen_prepare, |
69dca43d | 1627 | .bdrv_child_perm = bdrv_default_perms, |
959355a4 | 1628 | .bdrv_co_create = bdrv_qed_co_create, |
efc75e2a | 1629 | .bdrv_co_create_opts = bdrv_qed_co_create_opts, |
3ac21627 | 1630 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
b8d739fd | 1631 | .bdrv_co_block_status = bdrv_qed_co_block_status, |
89f89709 KW |
1632 | .bdrv_co_readv = bdrv_qed_co_readv, |
1633 | .bdrv_co_writev = bdrv_qed_co_writev, | |
49a2e483 | 1634 | .bdrv_co_pwrite_zeroes = bdrv_qed_co_pwrite_zeroes, |
061ca8a3 | 1635 | .bdrv_co_truncate = bdrv_qed_co_truncate, |
75411d23 SH |
1636 | .bdrv_getlength = bdrv_qed_getlength, |
1637 | .bdrv_get_info = bdrv_qed_get_info, | |
d34682cd | 1638 | .bdrv_refresh_limits = bdrv_qed_refresh_limits, |
75411d23 | 1639 | .bdrv_change_backing_file = bdrv_qed_change_backing_file, |
2b148f39 | 1640 | .bdrv_co_invalidate_cache = bdrv_qed_co_invalidate_cache, |
2fd61638 | 1641 | .bdrv_co_check = bdrv_qed_co_check, |
a8c868c3 SH |
1642 | .bdrv_detach_aio_context = bdrv_qed_detach_aio_context, |
1643 | .bdrv_attach_aio_context = bdrv_qed_attach_aio_context, | |
f8ea8dac | 1644 | .bdrv_co_drain_begin = bdrv_qed_co_drain_begin, |
75411d23 SH |
1645 | }; |
1646 | ||
1647 | static void bdrv_qed_init(void) | |
1648 | { | |
1649 | bdrv_register(&bdrv_qed); | |
1650 | } | |
1651 | ||
1652 | block_init(bdrv_qed_init); |