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Commit | Line | Data |
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bfcc224e AV |
1 | /* |
2 | * Write logging blk driver based on blkverify and blkdebug. | |
3 | * | |
4 | * Copyright (c) 2017 Tuomas Tynkkynen <tuomas@tuxera.com> | |
5 | * Copyright (c) 2018 Aapo Vienamo <aapo@tuxera.com> | |
6 | * Copyright (c) 2018 Ari Sundholm <ari@tuxera.com> | |
7 | * | |
8 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
9 | * See the COPYING file in the top-level directory. | |
10 | */ | |
11 | ||
12 | #include "qemu/osdep.h" | |
13 | #include "qapi/error.h" | |
14 | #include "qemu/sockets.h" /* for EINPROGRESS on Windows */ | |
15 | #include "block/block_int.h" | |
16 | #include "qapi/qmp/qdict.h" | |
17 | #include "qapi/qmp/qstring.h" | |
18 | #include "qemu/cutils.h" | |
0b8fa32f | 19 | #include "qemu/module.h" |
bfcc224e AV |
20 | #include "qemu/option.h" |
21 | ||
22 | /* Disk format stuff - taken from Linux drivers/md/dm-log-writes.c */ | |
23 | ||
24 | #define LOG_FLUSH_FLAG (1 << 0) | |
25 | #define LOG_FUA_FLAG (1 << 1) | |
26 | #define LOG_DISCARD_FLAG (1 << 2) | |
27 | #define LOG_MARK_FLAG (1 << 3) | |
0878b3c1 AS |
28 | #define LOG_FLAG_MASK (LOG_FLUSH_FLAG \ |
29 | | LOG_FUA_FLAG \ | |
30 | | LOG_DISCARD_FLAG \ | |
31 | | LOG_MARK_FLAG) | |
bfcc224e AV |
32 | |
33 | #define WRITE_LOG_VERSION 1ULL | |
34 | #define WRITE_LOG_MAGIC 0x6a736677736872ULL | |
35 | ||
36 | /* All fields are little-endian. */ | |
37 | struct log_write_super { | |
38 | uint64_t magic; | |
39 | uint64_t version; | |
40 | uint64_t nr_entries; | |
41 | uint32_t sectorsize; | |
42 | } QEMU_PACKED; | |
43 | ||
44 | struct log_write_entry { | |
45 | uint64_t sector; | |
46 | uint64_t nr_sectors; | |
47 | uint64_t flags; | |
48 | uint64_t data_len; | |
49 | } QEMU_PACKED; | |
50 | ||
51 | /* End of disk format structures. */ | |
52 | ||
53 | typedef struct { | |
54 | BdrvChild *log_file; | |
55 | uint32_t sectorsize; | |
56 | uint32_t sectorbits; | |
57 | uint64_t cur_log_sector; | |
58 | uint64_t nr_entries; | |
1dce698e | 59 | uint64_t update_interval; |
bfcc224e AV |
60 | } BDRVBlkLogWritesState; |
61 | ||
62 | static QemuOptsList runtime_opts = { | |
63 | .name = "blklogwrites", | |
64 | .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), | |
65 | .desc = { | |
0878b3c1 AS |
66 | { |
67 | .name = "log-append", | |
68 | .type = QEMU_OPT_BOOL, | |
69 | .help = "Append to an existing log", | |
70 | }, | |
bfcc224e AV |
71 | { |
72 | .name = "log-sector-size", | |
73 | .type = QEMU_OPT_SIZE, | |
74 | .help = "Log sector size", | |
75 | }, | |
1dce698e AS |
76 | { |
77 | .name = "log-super-update-interval", | |
78 | .type = QEMU_OPT_NUMBER, | |
79 | .help = "Log superblock update interval (# of write requests)", | |
80 | }, | |
bfcc224e AV |
81 | { /* end of list */ } |
82 | }, | |
83 | }; | |
84 | ||
85 | static inline uint32_t blk_log_writes_log2(uint32_t value) | |
86 | { | |
87 | assert(value > 0); | |
88 | return 31 - clz32(value); | |
89 | } | |
90 | ||
0878b3c1 AS |
91 | static inline bool blk_log_writes_sector_size_valid(uint32_t sector_size) |
92 | { | |
ba814c82 AS |
93 | return is_power_of_2(sector_size) && |
94 | sector_size >= sizeof(struct log_write_super) && | |
95 | sector_size >= sizeof(struct log_write_entry) && | |
96 | sector_size < (1ull << 24); | |
0878b3c1 AS |
97 | } |
98 | ||
99 | static uint64_t blk_log_writes_find_cur_log_sector(BdrvChild *log, | |
100 | uint32_t sector_size, | |
101 | uint64_t nr_entries, | |
102 | Error **errp) | |
103 | { | |
104 | uint64_t cur_sector = 1; | |
105 | uint64_t cur_idx = 0; | |
106 | uint32_t sector_bits = blk_log_writes_log2(sector_size); | |
107 | struct log_write_entry cur_entry; | |
108 | ||
109 | while (cur_idx < nr_entries) { | |
110 | int read_ret = bdrv_pread(log, cur_sector << sector_bits, &cur_entry, | |
111 | sizeof(cur_entry)); | |
112 | if (read_ret < 0) { | |
113 | error_setg_errno(errp, -read_ret, | |
114 | "Failed to read log entry %"PRIu64, cur_idx); | |
115 | return (uint64_t)-1ull; | |
116 | } | |
117 | ||
118 | if (cur_entry.flags & ~cpu_to_le64(LOG_FLAG_MASK)) { | |
119 | error_setg(errp, "Invalid flags 0x%"PRIx64" in log entry %"PRIu64, | |
120 | le64_to_cpu(cur_entry.flags), cur_idx); | |
121 | return (uint64_t)-1ull; | |
122 | } | |
123 | ||
124 | /* Account for the sector of the entry itself */ | |
125 | ++cur_sector; | |
126 | ||
127 | /* | |
128 | * Account for the data of the write. | |
129 | * For discards, this data is not present. | |
130 | */ | |
131 | if (!(cur_entry.flags & cpu_to_le64(LOG_DISCARD_FLAG))) { | |
132 | cur_sector += le64_to_cpu(cur_entry.nr_sectors); | |
133 | } | |
134 | ||
135 | ++cur_idx; | |
136 | } | |
137 | ||
138 | return cur_sector; | |
139 | } | |
140 | ||
bfcc224e AV |
141 | static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags, |
142 | Error **errp) | |
143 | { | |
144 | BDRVBlkLogWritesState *s = bs->opaque; | |
145 | QemuOpts *opts; | |
146 | Error *local_err = NULL; | |
147 | int ret; | |
2dacaf7c | 148 | uint64_t log_sector_size; |
0878b3c1 | 149 | bool log_append; |
bfcc224e AV |
150 | |
151 | opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); | |
152 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
153 | if (local_err) { | |
154 | ret = -EINVAL; | |
155 | error_propagate(errp, local_err); | |
156 | goto fail; | |
157 | } | |
158 | ||
159 | /* Open the file */ | |
b3af2af4 HR |
160 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds, |
161 | BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, false, | |
bfcc224e AV |
162 | &local_err); |
163 | if (local_err) { | |
164 | ret = -EINVAL; | |
165 | error_propagate(errp, local_err); | |
166 | goto fail; | |
167 | } | |
168 | ||
bfcc224e | 169 | /* Open the log file */ |
58944401 HR |
170 | s->log_file = bdrv_open_child(NULL, options, "log", bs, &child_of_bds, |
171 | BDRV_CHILD_METADATA, false, &local_err); | |
bfcc224e AV |
172 | if (local_err) { |
173 | ret = -EINVAL; | |
174 | error_propagate(errp, local_err); | |
175 | goto fail; | |
176 | } | |
177 | ||
0878b3c1 AS |
178 | log_append = qemu_opt_get_bool(opts, "log-append", false); |
179 | ||
180 | if (log_append) { | |
181 | struct log_write_super log_sb = { 0, 0, 0, 0 }; | |
182 | ||
183 | if (qemu_opt_find(opts, "log-sector-size")) { | |
184 | ret = -EINVAL; | |
185 | error_setg(errp, "log-append and log-sector-size are mutually " | |
186 | "exclusive"); | |
187 | goto fail_log; | |
188 | } | |
189 | ||
190 | /* Read log superblock or fake one for an empty log */ | |
191 | if (!bdrv_getlength(s->log_file->bs)) { | |
192 | log_sb.magic = cpu_to_le64(WRITE_LOG_MAGIC); | |
193 | log_sb.version = cpu_to_le64(WRITE_LOG_VERSION); | |
194 | log_sb.nr_entries = cpu_to_le64(0); | |
195 | log_sb.sectorsize = cpu_to_le32(BDRV_SECTOR_SIZE); | |
196 | } else { | |
197 | ret = bdrv_pread(s->log_file, 0, &log_sb, sizeof(log_sb)); | |
198 | if (ret < 0) { | |
199 | error_setg_errno(errp, -ret, "Could not read log superblock"); | |
200 | goto fail_log; | |
201 | } | |
202 | } | |
203 | ||
204 | if (log_sb.magic != cpu_to_le64(WRITE_LOG_MAGIC)) { | |
205 | ret = -EINVAL; | |
206 | error_setg(errp, "Invalid log superblock magic"); | |
207 | goto fail_log; | |
208 | } | |
209 | ||
210 | if (log_sb.version != cpu_to_le64(WRITE_LOG_VERSION)) { | |
211 | ret = -EINVAL; | |
212 | error_setg(errp, "Unsupported log version %"PRIu64, | |
213 | le64_to_cpu(log_sb.version)); | |
214 | goto fail_log; | |
215 | } | |
216 | ||
217 | log_sector_size = le32_to_cpu(log_sb.sectorsize); | |
218 | s->cur_log_sector = 1; | |
219 | s->nr_entries = 0; | |
220 | ||
221 | if (blk_log_writes_sector_size_valid(log_sector_size)) { | |
222 | s->cur_log_sector = | |
223 | blk_log_writes_find_cur_log_sector(s->log_file, log_sector_size, | |
224 | le64_to_cpu(log_sb.nr_entries), &local_err); | |
225 | if (local_err) { | |
226 | ret = -EINVAL; | |
227 | error_propagate(errp, local_err); | |
228 | goto fail_log; | |
229 | } | |
230 | ||
231 | s->nr_entries = le64_to_cpu(log_sb.nr_entries); | |
232 | } | |
233 | } else { | |
234 | log_sector_size = qemu_opt_get_size(opts, "log-sector-size", | |
235 | BDRV_SECTOR_SIZE); | |
236 | s->cur_log_sector = 1; | |
237 | s->nr_entries = 0; | |
238 | } | |
239 | ||
240 | if (!blk_log_writes_sector_size_valid(log_sector_size)) { | |
241 | ret = -EINVAL; | |
242 | error_setg(errp, "Invalid log sector size %"PRIu64, log_sector_size); | |
243 | goto fail_log; | |
244 | } | |
245 | ||
246 | s->sectorsize = log_sector_size; | |
247 | s->sectorbits = blk_log_writes_log2(log_sector_size); | |
1dce698e AS |
248 | s->update_interval = qemu_opt_get_number(opts, "log-super-update-interval", |
249 | 4096); | |
250 | if (!s->update_interval) { | |
251 | ret = -EINVAL; | |
252 | error_setg(errp, "Invalid log superblock update interval %"PRIu64, | |
253 | s->update_interval); | |
254 | goto fail_log; | |
255 | } | |
0878b3c1 | 256 | |
bfcc224e | 257 | ret = 0; |
0878b3c1 AS |
258 | fail_log: |
259 | if (ret < 0) { | |
260 | bdrv_unref_child(bs, s->log_file); | |
261 | s->log_file = NULL; | |
262 | } | |
bfcc224e AV |
263 | fail: |
264 | if (ret < 0) { | |
265 | bdrv_unref_child(bs, bs->file); | |
266 | bs->file = NULL; | |
267 | } | |
268 | qemu_opts_del(opts); | |
269 | return ret; | |
270 | } | |
271 | ||
272 | static void blk_log_writes_close(BlockDriverState *bs) | |
273 | { | |
274 | BDRVBlkLogWritesState *s = bs->opaque; | |
275 | ||
276 | bdrv_unref_child(bs, s->log_file); | |
277 | s->log_file = NULL; | |
278 | } | |
279 | ||
280 | static int64_t blk_log_writes_getlength(BlockDriverState *bs) | |
281 | { | |
282 | return bdrv_getlength(bs->file->bs); | |
283 | } | |
284 | ||
bfcc224e | 285 | static void blk_log_writes_child_perm(BlockDriverState *bs, BdrvChild *c, |
bd86fb99 | 286 | const BdrvChildClass *child_class, |
bf8e925e | 287 | BdrvChildRole role, |
bfcc224e AV |
288 | BlockReopenQueue *ro_q, |
289 | uint64_t perm, uint64_t shrd, | |
290 | uint64_t *nperm, uint64_t *nshrd) | |
291 | { | |
292 | if (!c) { | |
293 | *nperm = perm & DEFAULT_PERM_PASSTHROUGH; | |
294 | *nshrd = (shrd & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED; | |
295 | return; | |
296 | } | |
297 | ||
298 | if (!strcmp(c->name, "log")) { | |
bf8e925e HR |
299 | bdrv_format_default_perms(bs, c, child_class, role, ro_q, perm, shrd, |
300 | nperm, nshrd); | |
bfcc224e | 301 | } else { |
bf8e925e HR |
302 | bdrv_filter_default_perms(bs, c, child_class, role, ro_q, perm, shrd, |
303 | nperm, nshrd); | |
bfcc224e AV |
304 | } |
305 | } | |
306 | ||
307 | static void blk_log_writes_refresh_limits(BlockDriverState *bs, Error **errp) | |
308 | { | |
309 | BDRVBlkLogWritesState *s = bs->opaque; | |
310 | bs->bl.request_alignment = s->sectorsize; | |
311 | } | |
312 | ||
313 | static int coroutine_fn | |
314 | blk_log_writes_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, | |
315 | QEMUIOVector *qiov, int flags) | |
316 | { | |
317 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags); | |
318 | } | |
319 | ||
320 | typedef struct BlkLogWritesFileReq { | |
321 | BlockDriverState *bs; | |
322 | uint64_t offset; | |
323 | uint64_t bytes; | |
324 | int file_flags; | |
325 | QEMUIOVector *qiov; | |
326 | int (*func)(struct BlkLogWritesFileReq *r); | |
327 | int file_ret; | |
328 | } BlkLogWritesFileReq; | |
329 | ||
330 | typedef struct { | |
331 | BlockDriverState *bs; | |
332 | QEMUIOVector *qiov; | |
333 | struct log_write_entry entry; | |
334 | uint64_t zero_size; | |
335 | int log_ret; | |
336 | } BlkLogWritesLogReq; | |
337 | ||
338 | static void coroutine_fn blk_log_writes_co_do_log(BlkLogWritesLogReq *lr) | |
339 | { | |
340 | BDRVBlkLogWritesState *s = lr->bs->opaque; | |
341 | uint64_t cur_log_offset = s->cur_log_sector << s->sectorbits; | |
342 | ||
343 | s->nr_entries++; | |
344 | s->cur_log_sector += | |
345 | ROUND_UP(lr->qiov->size, s->sectorsize) >> s->sectorbits; | |
346 | ||
347 | lr->log_ret = bdrv_co_pwritev(s->log_file, cur_log_offset, lr->qiov->size, | |
348 | lr->qiov, 0); | |
349 | ||
350 | /* Logging for the "write zeroes" operation */ | |
351 | if (lr->log_ret == 0 && lr->zero_size) { | |
352 | cur_log_offset = s->cur_log_sector << s->sectorbits; | |
353 | s->cur_log_sector += | |
354 | ROUND_UP(lr->zero_size, s->sectorsize) >> s->sectorbits; | |
355 | ||
356 | lr->log_ret = bdrv_co_pwrite_zeroes(s->log_file, cur_log_offset, | |
357 | lr->zero_size, 0); | |
358 | } | |
359 | ||
1dce698e AS |
360 | /* Update super block on flush or every update interval */ |
361 | if (lr->log_ret == 0 && ((lr->entry.flags & LOG_FLUSH_FLAG) | |
362 | || (s->nr_entries % s->update_interval == 0))) | |
363 | { | |
bfcc224e AV |
364 | struct log_write_super super = { |
365 | .magic = cpu_to_le64(WRITE_LOG_MAGIC), | |
366 | .version = cpu_to_le64(WRITE_LOG_VERSION), | |
367 | .nr_entries = cpu_to_le64(s->nr_entries), | |
368 | .sectorsize = cpu_to_le32(s->sectorsize), | |
369 | }; | |
370 | void *zeroes = g_malloc0(s->sectorsize - sizeof(super)); | |
371 | QEMUIOVector qiov; | |
372 | ||
373 | qemu_iovec_init(&qiov, 2); | |
374 | qemu_iovec_add(&qiov, &super, sizeof(super)); | |
375 | qemu_iovec_add(&qiov, zeroes, s->sectorsize - sizeof(super)); | |
376 | ||
377 | lr->log_ret = | |
378 | bdrv_co_pwritev(s->log_file, 0, s->sectorsize, &qiov, 0); | |
379 | if (lr->log_ret == 0) { | |
380 | lr->log_ret = bdrv_co_flush(s->log_file->bs); | |
381 | } | |
382 | qemu_iovec_destroy(&qiov); | |
383 | g_free(zeroes); | |
384 | } | |
385 | } | |
386 | ||
387 | static void coroutine_fn blk_log_writes_co_do_file(BlkLogWritesFileReq *fr) | |
388 | { | |
389 | fr->file_ret = fr->func(fr); | |
390 | } | |
391 | ||
392 | static int coroutine_fn | |
393 | blk_log_writes_co_log(BlockDriverState *bs, uint64_t offset, uint64_t bytes, | |
394 | QEMUIOVector *qiov, int flags, | |
395 | int (*file_func)(BlkLogWritesFileReq *r), | |
396 | uint64_t entry_flags, bool is_zero_write) | |
397 | { | |
398 | QEMUIOVector log_qiov; | |
399 | size_t niov = qiov ? qiov->niov : 0; | |
400 | BDRVBlkLogWritesState *s = bs->opaque; | |
401 | BlkLogWritesFileReq fr = { | |
402 | .bs = bs, | |
403 | .offset = offset, | |
404 | .bytes = bytes, | |
405 | .file_flags = flags, | |
406 | .qiov = qiov, | |
407 | .func = file_func, | |
408 | }; | |
409 | BlkLogWritesLogReq lr = { | |
410 | .bs = bs, | |
411 | .qiov = &log_qiov, | |
412 | .entry = { | |
413 | .sector = cpu_to_le64(offset >> s->sectorbits), | |
414 | .nr_sectors = cpu_to_le64(bytes >> s->sectorbits), | |
415 | .flags = cpu_to_le64(entry_flags), | |
416 | .data_len = 0, | |
417 | }, | |
418 | .zero_size = is_zero_write ? bytes : 0, | |
419 | }; | |
420 | void *zeroes = g_malloc0(s->sectorsize - sizeof(lr.entry)); | |
421 | ||
422 | assert((1 << s->sectorbits) == s->sectorsize); | |
423 | assert(bs->bl.request_alignment == s->sectorsize); | |
424 | assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment)); | |
425 | assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment)); | |
426 | ||
427 | qemu_iovec_init(&log_qiov, niov + 2); | |
428 | qemu_iovec_add(&log_qiov, &lr.entry, sizeof(lr.entry)); | |
429 | qemu_iovec_add(&log_qiov, zeroes, s->sectorsize - sizeof(lr.entry)); | |
430 | if (qiov) { | |
431 | qemu_iovec_concat(&log_qiov, qiov, 0, qiov->size); | |
432 | } | |
433 | ||
434 | blk_log_writes_co_do_file(&fr); | |
435 | blk_log_writes_co_do_log(&lr); | |
436 | ||
437 | qemu_iovec_destroy(&log_qiov); | |
438 | g_free(zeroes); | |
439 | ||
440 | if (lr.log_ret < 0) { | |
441 | return lr.log_ret; | |
442 | } | |
443 | ||
444 | return fr.file_ret; | |
445 | } | |
446 | ||
447 | static int coroutine_fn | |
448 | blk_log_writes_co_do_file_pwritev(BlkLogWritesFileReq *fr) | |
449 | { | |
450 | return bdrv_co_pwritev(fr->bs->file, fr->offset, fr->bytes, | |
451 | fr->qiov, fr->file_flags); | |
452 | } | |
453 | ||
454 | static int coroutine_fn | |
455 | blk_log_writes_co_do_file_pwrite_zeroes(BlkLogWritesFileReq *fr) | |
456 | { | |
457 | return bdrv_co_pwrite_zeroes(fr->bs->file, fr->offset, fr->bytes, | |
458 | fr->file_flags); | |
459 | } | |
460 | ||
461 | static int coroutine_fn blk_log_writes_co_do_file_flush(BlkLogWritesFileReq *fr) | |
462 | { | |
463 | return bdrv_co_flush(fr->bs->file->bs); | |
464 | } | |
465 | ||
466 | static int coroutine_fn | |
467 | blk_log_writes_co_do_file_pdiscard(BlkLogWritesFileReq *fr) | |
468 | { | |
0b9fd3f4 | 469 | return bdrv_co_pdiscard(fr->bs->file, fr->offset, fr->bytes); |
bfcc224e AV |
470 | } |
471 | ||
472 | static int coroutine_fn | |
473 | blk_log_writes_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, | |
474 | QEMUIOVector *qiov, int flags) | |
475 | { | |
476 | return blk_log_writes_co_log(bs, offset, bytes, qiov, flags, | |
477 | blk_log_writes_co_do_file_pwritev, 0, false); | |
478 | } | |
479 | ||
480 | static int coroutine_fn | |
481 | blk_log_writes_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int bytes, | |
482 | BdrvRequestFlags flags) | |
483 | { | |
484 | return blk_log_writes_co_log(bs, offset, bytes, NULL, flags, | |
485 | blk_log_writes_co_do_file_pwrite_zeroes, 0, | |
486 | true); | |
487 | } | |
488 | ||
489 | static int coroutine_fn blk_log_writes_co_flush_to_disk(BlockDriverState *bs) | |
490 | { | |
491 | return blk_log_writes_co_log(bs, 0, 0, NULL, 0, | |
492 | blk_log_writes_co_do_file_flush, | |
493 | LOG_FLUSH_FLAG, false); | |
494 | } | |
495 | ||
496 | static int coroutine_fn | |
497 | blk_log_writes_co_pdiscard(BlockDriverState *bs, int64_t offset, int count) | |
498 | { | |
499 | return blk_log_writes_co_log(bs, offset, count, NULL, 0, | |
500 | blk_log_writes_co_do_file_pdiscard, | |
501 | LOG_DISCARD_FLAG, false); | |
502 | } | |
503 | ||
2654267c HR |
504 | static const char *const blk_log_writes_strong_runtime_opts[] = { |
505 | "log-append", | |
506 | "log-sector-size", | |
507 | ||
508 | NULL | |
509 | }; | |
510 | ||
bfcc224e AV |
511 | static BlockDriver bdrv_blk_log_writes = { |
512 | .format_name = "blklogwrites", | |
513 | .instance_size = sizeof(BDRVBlkLogWritesState), | |
514 | ||
515 | .bdrv_open = blk_log_writes_open, | |
516 | .bdrv_close = blk_log_writes_close, | |
517 | .bdrv_getlength = blk_log_writes_getlength, | |
bfcc224e AV |
518 | .bdrv_child_perm = blk_log_writes_child_perm, |
519 | .bdrv_refresh_limits = blk_log_writes_refresh_limits, | |
520 | ||
521 | .bdrv_co_preadv = blk_log_writes_co_preadv, | |
522 | .bdrv_co_pwritev = blk_log_writes_co_pwritev, | |
523 | .bdrv_co_pwrite_zeroes = blk_log_writes_co_pwrite_zeroes, | |
524 | .bdrv_co_flush_to_disk = blk_log_writes_co_flush_to_disk, | |
525 | .bdrv_co_pdiscard = blk_log_writes_co_pdiscard, | |
526 | .bdrv_co_block_status = bdrv_co_block_status_from_file, | |
527 | ||
528 | .is_filter = true, | |
2654267c | 529 | .strong_runtime_opts = blk_log_writes_strong_runtime_opts, |
bfcc224e AV |
530 | }; |
531 | ||
532 | static void bdrv_blk_log_writes_init(void) | |
533 | { | |
534 | bdrv_register(&bdrv_blk_log_writes); | |
535 | } | |
536 | ||
537 | block_init(bdrv_blk_log_writes_init); |