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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 */ | |
e2c1c34f | 15 | #include "block/block-io.h" |
bfcc224e AV |
16 | #include "block/block_int.h" |
17 | #include "qapi/qmp/qdict.h" | |
18 | #include "qapi/qmp/qstring.h" | |
19 | #include "qemu/cutils.h" | |
0b8fa32f | 20 | #include "qemu/module.h" |
bfcc224e AV |
21 | #include "qemu/option.h" |
22 | ||
23 | /* Disk format stuff - taken from Linux drivers/md/dm-log-writes.c */ | |
24 | ||
25 | #define LOG_FLUSH_FLAG (1 << 0) | |
26 | #define LOG_FUA_FLAG (1 << 1) | |
27 | #define LOG_DISCARD_FLAG (1 << 2) | |
28 | #define LOG_MARK_FLAG (1 << 3) | |
0878b3c1 AS |
29 | #define LOG_FLAG_MASK (LOG_FLUSH_FLAG \ |
30 | | LOG_FUA_FLAG \ | |
31 | | LOG_DISCARD_FLAG \ | |
32 | | LOG_MARK_FLAG) | |
bfcc224e AV |
33 | |
34 | #define WRITE_LOG_VERSION 1ULL | |
35 | #define WRITE_LOG_MAGIC 0x6a736677736872ULL | |
36 | ||
37 | /* All fields are little-endian. */ | |
38 | struct log_write_super { | |
39 | uint64_t magic; | |
40 | uint64_t version; | |
41 | uint64_t nr_entries; | |
42 | uint32_t sectorsize; | |
43 | } QEMU_PACKED; | |
44 | ||
45 | struct log_write_entry { | |
46 | uint64_t sector; | |
47 | uint64_t nr_sectors; | |
48 | uint64_t flags; | |
49 | uint64_t data_len; | |
50 | } QEMU_PACKED; | |
51 | ||
52 | /* End of disk format structures. */ | |
53 | ||
54 | typedef struct { | |
55 | BdrvChild *log_file; | |
56 | uint32_t sectorsize; | |
57 | uint32_t sectorbits; | |
58 | uint64_t cur_log_sector; | |
59 | uint64_t nr_entries; | |
1dce698e | 60 | uint64_t update_interval; |
bfcc224e AV |
61 | } BDRVBlkLogWritesState; |
62 | ||
63 | static QemuOptsList runtime_opts = { | |
64 | .name = "blklogwrites", | |
65 | .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), | |
66 | .desc = { | |
0878b3c1 AS |
67 | { |
68 | .name = "log-append", | |
69 | .type = QEMU_OPT_BOOL, | |
70 | .help = "Append to an existing log", | |
71 | }, | |
bfcc224e AV |
72 | { |
73 | .name = "log-sector-size", | |
74 | .type = QEMU_OPT_SIZE, | |
75 | .help = "Log sector size", | |
76 | }, | |
1dce698e AS |
77 | { |
78 | .name = "log-super-update-interval", | |
79 | .type = QEMU_OPT_NUMBER, | |
80 | .help = "Log superblock update interval (# of write requests)", | |
81 | }, | |
bfcc224e AV |
82 | { /* end of list */ } |
83 | }, | |
84 | }; | |
85 | ||
86 | static inline uint32_t blk_log_writes_log2(uint32_t value) | |
87 | { | |
88 | assert(value > 0); | |
89 | return 31 - clz32(value); | |
90 | } | |
91 | ||
0878b3c1 AS |
92 | static inline bool blk_log_writes_sector_size_valid(uint32_t sector_size) |
93 | { | |
ba814c82 AS |
94 | return is_power_of_2(sector_size) && |
95 | sector_size >= sizeof(struct log_write_super) && | |
96 | sector_size >= sizeof(struct log_write_entry) && | |
97 | sector_size < (1ull << 24); | |
0878b3c1 AS |
98 | } |
99 | ||
100 | static uint64_t blk_log_writes_find_cur_log_sector(BdrvChild *log, | |
101 | uint32_t sector_size, | |
102 | uint64_t nr_entries, | |
103 | Error **errp) | |
104 | { | |
105 | uint64_t cur_sector = 1; | |
106 | uint64_t cur_idx = 0; | |
107 | uint32_t sector_bits = blk_log_writes_log2(sector_size); | |
108 | struct log_write_entry cur_entry; | |
109 | ||
110 | while (cur_idx < nr_entries) { | |
32cc71de AF |
111 | int read_ret = bdrv_pread(log, cur_sector << sector_bits, |
112 | sizeof(cur_entry), &cur_entry, 0); | |
0878b3c1 AS |
113 | if (read_ret < 0) { |
114 | error_setg_errno(errp, -read_ret, | |
115 | "Failed to read log entry %"PRIu64, cur_idx); | |
116 | return (uint64_t)-1ull; | |
117 | } | |
118 | ||
119 | if (cur_entry.flags & ~cpu_to_le64(LOG_FLAG_MASK)) { | |
120 | error_setg(errp, "Invalid flags 0x%"PRIx64" in log entry %"PRIu64, | |
121 | le64_to_cpu(cur_entry.flags), cur_idx); | |
122 | return (uint64_t)-1ull; | |
123 | } | |
124 | ||
125 | /* Account for the sector of the entry itself */ | |
126 | ++cur_sector; | |
127 | ||
128 | /* | |
129 | * Account for the data of the write. | |
130 | * For discards, this data is not present. | |
131 | */ | |
132 | if (!(cur_entry.flags & cpu_to_le64(LOG_DISCARD_FLAG))) { | |
133 | cur_sector += le64_to_cpu(cur_entry.nr_sectors); | |
134 | } | |
135 | ||
136 | ++cur_idx; | |
137 | } | |
138 | ||
139 | return cur_sector; | |
140 | } | |
141 | ||
bfcc224e AV |
142 | static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags, |
143 | Error **errp) | |
144 | { | |
145 | BDRVBlkLogWritesState *s = bs->opaque; | |
146 | QemuOpts *opts; | |
147 | Error *local_err = NULL; | |
148 | int ret; | |
2dacaf7c | 149 | uint64_t log_sector_size; |
0878b3c1 | 150 | bool log_append; |
bfcc224e AV |
151 | |
152 | opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); | |
af175e85 | 153 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
bfcc224e | 154 | ret = -EINVAL; |
bfcc224e AV |
155 | goto fail; |
156 | } | |
157 | ||
158 | /* Open the file */ | |
83930780 VSO |
159 | ret = bdrv_open_file_child(NULL, options, "file", bs, errp); |
160 | if (ret < 0) { | |
bfcc224e AV |
161 | goto fail; |
162 | } | |
163 | ||
bfcc224e | 164 | /* Open the log file */ |
58944401 | 165 | s->log_file = bdrv_open_child(NULL, options, "log", bs, &child_of_bds, |
bc520249 VSO |
166 | BDRV_CHILD_METADATA, false, errp); |
167 | if (!s->log_file) { | |
bfcc224e | 168 | ret = -EINVAL; |
bfcc224e AV |
169 | goto fail; |
170 | } | |
171 | ||
0878b3c1 AS |
172 | log_append = qemu_opt_get_bool(opts, "log-append", false); |
173 | ||
174 | if (log_append) { | |
175 | struct log_write_super log_sb = { 0, 0, 0, 0 }; | |
176 | ||
177 | if (qemu_opt_find(opts, "log-sector-size")) { | |
178 | ret = -EINVAL; | |
179 | error_setg(errp, "log-append and log-sector-size are mutually " | |
180 | "exclusive"); | |
181 | goto fail_log; | |
182 | } | |
183 | ||
184 | /* Read log superblock or fake one for an empty log */ | |
185 | if (!bdrv_getlength(s->log_file->bs)) { | |
186 | log_sb.magic = cpu_to_le64(WRITE_LOG_MAGIC); | |
187 | log_sb.version = cpu_to_le64(WRITE_LOG_VERSION); | |
188 | log_sb.nr_entries = cpu_to_le64(0); | |
189 | log_sb.sectorsize = cpu_to_le32(BDRV_SECTOR_SIZE); | |
190 | } else { | |
32cc71de | 191 | ret = bdrv_pread(s->log_file, 0, sizeof(log_sb), &log_sb, 0); |
0878b3c1 AS |
192 | if (ret < 0) { |
193 | error_setg_errno(errp, -ret, "Could not read log superblock"); | |
194 | goto fail_log; | |
195 | } | |
196 | } | |
197 | ||
198 | if (log_sb.magic != cpu_to_le64(WRITE_LOG_MAGIC)) { | |
199 | ret = -EINVAL; | |
200 | error_setg(errp, "Invalid log superblock magic"); | |
201 | goto fail_log; | |
202 | } | |
203 | ||
204 | if (log_sb.version != cpu_to_le64(WRITE_LOG_VERSION)) { | |
205 | ret = -EINVAL; | |
206 | error_setg(errp, "Unsupported log version %"PRIu64, | |
207 | le64_to_cpu(log_sb.version)); | |
208 | goto fail_log; | |
209 | } | |
210 | ||
211 | log_sector_size = le32_to_cpu(log_sb.sectorsize); | |
212 | s->cur_log_sector = 1; | |
213 | s->nr_entries = 0; | |
214 | ||
215 | if (blk_log_writes_sector_size_valid(log_sector_size)) { | |
216 | s->cur_log_sector = | |
217 | blk_log_writes_find_cur_log_sector(s->log_file, log_sector_size, | |
218 | le64_to_cpu(log_sb.nr_entries), &local_err); | |
219 | if (local_err) { | |
220 | ret = -EINVAL; | |
221 | error_propagate(errp, local_err); | |
222 | goto fail_log; | |
223 | } | |
224 | ||
225 | s->nr_entries = le64_to_cpu(log_sb.nr_entries); | |
226 | } | |
227 | } else { | |
228 | log_sector_size = qemu_opt_get_size(opts, "log-sector-size", | |
229 | BDRV_SECTOR_SIZE); | |
230 | s->cur_log_sector = 1; | |
231 | s->nr_entries = 0; | |
232 | } | |
233 | ||
234 | if (!blk_log_writes_sector_size_valid(log_sector_size)) { | |
235 | ret = -EINVAL; | |
236 | error_setg(errp, "Invalid log sector size %"PRIu64, log_sector_size); | |
237 | goto fail_log; | |
238 | } | |
239 | ||
240 | s->sectorsize = log_sector_size; | |
241 | s->sectorbits = blk_log_writes_log2(log_sector_size); | |
1dce698e AS |
242 | s->update_interval = qemu_opt_get_number(opts, "log-super-update-interval", |
243 | 4096); | |
244 | if (!s->update_interval) { | |
245 | ret = -EINVAL; | |
246 | error_setg(errp, "Invalid log superblock update interval %"PRIu64, | |
247 | s->update_interval); | |
248 | goto fail_log; | |
249 | } | |
0878b3c1 | 250 | |
bfcc224e | 251 | ret = 0; |
0878b3c1 AS |
252 | fail_log: |
253 | if (ret < 0) { | |
254 | bdrv_unref_child(bs, s->log_file); | |
255 | s->log_file = NULL; | |
256 | } | |
bfcc224e | 257 | fail: |
bfcc224e AV |
258 | qemu_opts_del(opts); |
259 | return ret; | |
260 | } | |
261 | ||
262 | static void blk_log_writes_close(BlockDriverState *bs) | |
263 | { | |
264 | BDRVBlkLogWritesState *s = bs->opaque; | |
265 | ||
266 | bdrv_unref_child(bs, s->log_file); | |
267 | s->log_file = NULL; | |
268 | } | |
269 | ||
c86422c5 | 270 | static int64_t coroutine_fn blk_log_writes_co_getlength(BlockDriverState *bs) |
bfcc224e | 271 | { |
c86422c5 | 272 | return bdrv_co_getlength(bs->file->bs); |
bfcc224e AV |
273 | } |
274 | ||
bfcc224e | 275 | static void blk_log_writes_child_perm(BlockDriverState *bs, BdrvChild *c, |
bf8e925e | 276 | BdrvChildRole role, |
bfcc224e AV |
277 | BlockReopenQueue *ro_q, |
278 | uint64_t perm, uint64_t shrd, | |
279 | uint64_t *nperm, uint64_t *nshrd) | |
280 | { | |
281 | if (!c) { | |
282 | *nperm = perm & DEFAULT_PERM_PASSTHROUGH; | |
283 | *nshrd = (shrd & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED; | |
284 | return; | |
285 | } | |
286 | ||
e5d8a406 | 287 | bdrv_default_perms(bs, c, role, ro_q, perm, shrd, |
69dca43d | 288 | nperm, nshrd); |
bfcc224e AV |
289 | } |
290 | ||
291 | static void blk_log_writes_refresh_limits(BlockDriverState *bs, Error **errp) | |
292 | { | |
293 | BDRVBlkLogWritesState *s = bs->opaque; | |
294 | bs->bl.request_alignment = s->sectorsize; | |
295 | } | |
296 | ||
297 | static int coroutine_fn | |
f7ef38dd VSO |
298 | blk_log_writes_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, |
299 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
bfcc224e AV |
300 | { |
301 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags); | |
302 | } | |
303 | ||
304 | typedef struct BlkLogWritesFileReq { | |
305 | BlockDriverState *bs; | |
306 | uint64_t offset; | |
307 | uint64_t bytes; | |
308 | int file_flags; | |
309 | QEMUIOVector *qiov; | |
88095349 | 310 | int GRAPH_RDLOCK_PTR (*func)(struct BlkLogWritesFileReq *r); |
bfcc224e AV |
311 | int file_ret; |
312 | } BlkLogWritesFileReq; | |
313 | ||
314 | typedef struct { | |
315 | BlockDriverState *bs; | |
316 | QEMUIOVector *qiov; | |
317 | struct log_write_entry entry; | |
318 | uint64_t zero_size; | |
319 | int log_ret; | |
320 | } BlkLogWritesLogReq; | |
321 | ||
88095349 EGE |
322 | static void coroutine_fn GRAPH_RDLOCK |
323 | blk_log_writes_co_do_log(BlkLogWritesLogReq *lr) | |
bfcc224e AV |
324 | { |
325 | BDRVBlkLogWritesState *s = lr->bs->opaque; | |
326 | uint64_t cur_log_offset = s->cur_log_sector << s->sectorbits; | |
327 | ||
328 | s->nr_entries++; | |
329 | s->cur_log_sector += | |
330 | ROUND_UP(lr->qiov->size, s->sectorsize) >> s->sectorbits; | |
331 | ||
332 | lr->log_ret = bdrv_co_pwritev(s->log_file, cur_log_offset, lr->qiov->size, | |
333 | lr->qiov, 0); | |
334 | ||
335 | /* Logging for the "write zeroes" operation */ | |
336 | if (lr->log_ret == 0 && lr->zero_size) { | |
337 | cur_log_offset = s->cur_log_sector << s->sectorbits; | |
338 | s->cur_log_sector += | |
339 | ROUND_UP(lr->zero_size, s->sectorsize) >> s->sectorbits; | |
340 | ||
341 | lr->log_ret = bdrv_co_pwrite_zeroes(s->log_file, cur_log_offset, | |
342 | lr->zero_size, 0); | |
343 | } | |
344 | ||
1dce698e AS |
345 | /* Update super block on flush or every update interval */ |
346 | if (lr->log_ret == 0 && ((lr->entry.flags & LOG_FLUSH_FLAG) | |
347 | || (s->nr_entries % s->update_interval == 0))) | |
348 | { | |
bfcc224e AV |
349 | struct log_write_super super = { |
350 | .magic = cpu_to_le64(WRITE_LOG_MAGIC), | |
351 | .version = cpu_to_le64(WRITE_LOG_VERSION), | |
352 | .nr_entries = cpu_to_le64(s->nr_entries), | |
353 | .sectorsize = cpu_to_le32(s->sectorsize), | |
354 | }; | |
355 | void *zeroes = g_malloc0(s->sectorsize - sizeof(super)); | |
356 | QEMUIOVector qiov; | |
357 | ||
358 | qemu_iovec_init(&qiov, 2); | |
359 | qemu_iovec_add(&qiov, &super, sizeof(super)); | |
360 | qemu_iovec_add(&qiov, zeroes, s->sectorsize - sizeof(super)); | |
361 | ||
362 | lr->log_ret = | |
363 | bdrv_co_pwritev(s->log_file, 0, s->sectorsize, &qiov, 0); | |
364 | if (lr->log_ret == 0) { | |
365 | lr->log_ret = bdrv_co_flush(s->log_file->bs); | |
366 | } | |
367 | qemu_iovec_destroy(&qiov); | |
368 | g_free(zeroes); | |
369 | } | |
370 | } | |
371 | ||
88095349 EGE |
372 | static void coroutine_fn GRAPH_RDLOCK |
373 | blk_log_writes_co_do_file(BlkLogWritesFileReq *fr) | |
bfcc224e AV |
374 | { |
375 | fr->file_ret = fr->func(fr); | |
376 | } | |
377 | ||
88095349 | 378 | static int coroutine_fn GRAPH_RDLOCK |
bfcc224e AV |
379 | blk_log_writes_co_log(BlockDriverState *bs, uint64_t offset, uint64_t bytes, |
380 | QEMUIOVector *qiov, int flags, | |
88095349 | 381 | int /*GRAPH_RDLOCK*/ (*file_func)(BlkLogWritesFileReq *r), |
bfcc224e AV |
382 | uint64_t entry_flags, bool is_zero_write) |
383 | { | |
384 | QEMUIOVector log_qiov; | |
385 | size_t niov = qiov ? qiov->niov : 0; | |
386 | BDRVBlkLogWritesState *s = bs->opaque; | |
387 | BlkLogWritesFileReq fr = { | |
388 | .bs = bs, | |
389 | .offset = offset, | |
390 | .bytes = bytes, | |
391 | .file_flags = flags, | |
392 | .qiov = qiov, | |
393 | .func = file_func, | |
394 | }; | |
395 | BlkLogWritesLogReq lr = { | |
396 | .bs = bs, | |
397 | .qiov = &log_qiov, | |
398 | .entry = { | |
399 | .sector = cpu_to_le64(offset >> s->sectorbits), | |
400 | .nr_sectors = cpu_to_le64(bytes >> s->sectorbits), | |
401 | .flags = cpu_to_le64(entry_flags), | |
402 | .data_len = 0, | |
403 | }, | |
404 | .zero_size = is_zero_write ? bytes : 0, | |
405 | }; | |
406 | void *zeroes = g_malloc0(s->sectorsize - sizeof(lr.entry)); | |
407 | ||
408 | assert((1 << s->sectorbits) == s->sectorsize); | |
409 | assert(bs->bl.request_alignment == s->sectorsize); | |
410 | assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment)); | |
411 | assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment)); | |
412 | ||
413 | qemu_iovec_init(&log_qiov, niov + 2); | |
414 | qemu_iovec_add(&log_qiov, &lr.entry, sizeof(lr.entry)); | |
415 | qemu_iovec_add(&log_qiov, zeroes, s->sectorsize - sizeof(lr.entry)); | |
416 | if (qiov) { | |
417 | qemu_iovec_concat(&log_qiov, qiov, 0, qiov->size); | |
418 | } | |
419 | ||
420 | blk_log_writes_co_do_file(&fr); | |
421 | blk_log_writes_co_do_log(&lr); | |
422 | ||
423 | qemu_iovec_destroy(&log_qiov); | |
424 | g_free(zeroes); | |
425 | ||
426 | if (lr.log_ret < 0) { | |
427 | return lr.log_ret; | |
428 | } | |
429 | ||
430 | return fr.file_ret; | |
431 | } | |
432 | ||
433 | static int coroutine_fn | |
434 | blk_log_writes_co_do_file_pwritev(BlkLogWritesFileReq *fr) | |
435 | { | |
436 | return bdrv_co_pwritev(fr->bs->file, fr->offset, fr->bytes, | |
437 | fr->qiov, fr->file_flags); | |
438 | } | |
439 | ||
abaf8b75 | 440 | static int coroutine_fn GRAPH_RDLOCK |
bfcc224e AV |
441 | blk_log_writes_co_do_file_pwrite_zeroes(BlkLogWritesFileReq *fr) |
442 | { | |
443 | return bdrv_co_pwrite_zeroes(fr->bs->file, fr->offset, fr->bytes, | |
444 | fr->file_flags); | |
445 | } | |
446 | ||
88095349 EGE |
447 | static int coroutine_fn GRAPH_RDLOCK |
448 | blk_log_writes_co_do_file_flush(BlkLogWritesFileReq *fr) | |
bfcc224e AV |
449 | { |
450 | return bdrv_co_flush(fr->bs->file->bs); | |
451 | } | |
452 | ||
9a5a1c62 | 453 | static int coroutine_fn GRAPH_RDLOCK |
bfcc224e AV |
454 | blk_log_writes_co_do_file_pdiscard(BlkLogWritesFileReq *fr) |
455 | { | |
0b9fd3f4 | 456 | return bdrv_co_pdiscard(fr->bs->file, fr->offset, fr->bytes); |
bfcc224e AV |
457 | } |
458 | ||
459 | static int coroutine_fn | |
e75abeda VSO |
460 | blk_log_writes_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, |
461 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
bfcc224e | 462 | { |
88095349 | 463 | assume_graph_lock(); /* FIXME */ |
bfcc224e AV |
464 | return blk_log_writes_co_log(bs, offset, bytes, qiov, flags, |
465 | blk_log_writes_co_do_file_pwritev, 0, false); | |
466 | } | |
467 | ||
abaf8b75 | 468 | static int coroutine_fn GRAPH_RDLOCK |
f34b2bcf VSO |
469 | blk_log_writes_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, |
470 | int64_t bytes, BdrvRequestFlags flags) | |
bfcc224e AV |
471 | { |
472 | return blk_log_writes_co_log(bs, offset, bytes, NULL, flags, | |
473 | blk_log_writes_co_do_file_pwrite_zeroes, 0, | |
474 | true); | |
475 | } | |
476 | ||
88095349 EGE |
477 | static int coroutine_fn GRAPH_RDLOCK |
478 | blk_log_writes_co_flush_to_disk(BlockDriverState *bs) | |
bfcc224e AV |
479 | { |
480 | return blk_log_writes_co_log(bs, 0, 0, NULL, 0, | |
481 | blk_log_writes_co_do_file_flush, | |
482 | LOG_FLUSH_FLAG, false); | |
483 | } | |
484 | ||
9a5a1c62 | 485 | static int coroutine_fn GRAPH_RDLOCK |
0c802287 | 486 | blk_log_writes_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) |
bfcc224e | 487 | { |
0c802287 | 488 | return blk_log_writes_co_log(bs, offset, bytes, NULL, 0, |
bfcc224e AV |
489 | blk_log_writes_co_do_file_pdiscard, |
490 | LOG_DISCARD_FLAG, false); | |
491 | } | |
492 | ||
2654267c HR |
493 | static const char *const blk_log_writes_strong_runtime_opts[] = { |
494 | "log-append", | |
495 | "log-sector-size", | |
496 | ||
497 | NULL | |
498 | }; | |
499 | ||
bfcc224e AV |
500 | static BlockDriver bdrv_blk_log_writes = { |
501 | .format_name = "blklogwrites", | |
502 | .instance_size = sizeof(BDRVBlkLogWritesState), | |
503 | ||
504 | .bdrv_open = blk_log_writes_open, | |
505 | .bdrv_close = blk_log_writes_close, | |
c86422c5 | 506 | .bdrv_co_getlength = blk_log_writes_co_getlength, |
bfcc224e AV |
507 | .bdrv_child_perm = blk_log_writes_child_perm, |
508 | .bdrv_refresh_limits = blk_log_writes_refresh_limits, | |
509 | ||
510 | .bdrv_co_preadv = blk_log_writes_co_preadv, | |
511 | .bdrv_co_pwritev = blk_log_writes_co_pwritev, | |
512 | .bdrv_co_pwrite_zeroes = blk_log_writes_co_pwrite_zeroes, | |
513 | .bdrv_co_flush_to_disk = blk_log_writes_co_flush_to_disk, | |
514 | .bdrv_co_pdiscard = blk_log_writes_co_pdiscard, | |
bfcc224e AV |
515 | |
516 | .is_filter = true, | |
2654267c | 517 | .strong_runtime_opts = blk_log_writes_strong_runtime_opts, |
bfcc224e AV |
518 | }; |
519 | ||
520 | static void bdrv_blk_log_writes_init(void) | |
521 | { | |
522 | bdrv_register(&bdrv_blk_log_writes); | |
523 | } | |
524 | ||
525 | block_init(bdrv_blk_log_writes_init); |