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Commit | Line | Data |
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893f7eba PB |
1 | /* |
2 | * Image mirroring | |
3 | * | |
4 | * Copyright Red Hat, Inc. 2012 | |
5 | * | |
6 | * Authors: | |
7 | * Paolo Bonzini <pbonzini@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU LGPL, version 2 or later. | |
10 | * See the COPYING.LIB file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
80c71a24 | 14 | #include "qemu/osdep.h" |
fd4a6493 | 15 | #include "qemu/cutils.h" |
12aa4082 | 16 | #include "qemu/coroutine.h" |
1181e19a | 17 | #include "qemu/range.h" |
893f7eba | 18 | #include "trace.h" |
c87621ea | 19 | #include "block/blockjob_int.h" |
737e150e | 20 | #include "block/block_int.h" |
e2c1c34f | 21 | #include "block/dirty-bitmap.h" |
373340b2 | 22 | #include "sysemu/block-backend.h" |
da34e65c | 23 | #include "qapi/error.h" |
893f7eba | 24 | #include "qemu/ratelimit.h" |
b812f671 | 25 | #include "qemu/bitmap.h" |
5df022cf | 26 | #include "qemu/memalign.h" |
893f7eba | 27 | |
402a4741 | 28 | #define MAX_IN_FLIGHT 16 |
b436982f EB |
29 | #define MAX_IO_BYTES (1 << 20) /* 1 Mb */ |
30 | #define DEFAULT_MIRROR_BUF_SIZE (MAX_IN_FLIGHT * MAX_IO_BYTES) | |
402a4741 PB |
31 | |
32 | /* The mirroring buffer is a list of granularity-sized chunks. | |
33 | * Free chunks are organized in a list. | |
34 | */ | |
35 | typedef struct MirrorBuffer { | |
36 | QSIMPLEQ_ENTRY(MirrorBuffer) next; | |
37 | } MirrorBuffer; | |
893f7eba | 38 | |
12aa4082 HR |
39 | typedef struct MirrorOp MirrorOp; |
40 | ||
893f7eba PB |
41 | typedef struct MirrorBlockJob { |
42 | BlockJob common; | |
e253f4b8 | 43 | BlockBackend *target; |
4ef85a9c | 44 | BlockDriverState *mirror_top_bs; |
5bc361b8 | 45 | BlockDriverState *base; |
3f072a7f | 46 | BlockDriverState *base_overlay; |
4ef85a9c | 47 | |
09158f00 BC |
48 | /* The name of the graph node to replace */ |
49 | char *replaces; | |
50 | /* The BDS to replace */ | |
51 | BlockDriverState *to_replace; | |
52 | /* Used to block operations on the drive-mirror-replace target */ | |
53 | Error *replace_blocker; | |
03544a6e | 54 | bool is_none_mode; |
274fccee | 55 | BlockMirrorBackingMode backing_mode; |
cdf3bc93 HR |
56 | /* Whether the target image requires explicit zero-initialization */ |
57 | bool zero_target; | |
d06107ad | 58 | MirrorCopyMode copy_mode; |
b952b558 | 59 | BlockdevOnError on_source_error, on_target_error; |
d06107ad HR |
60 | /* Set when the target is synced (dirty bitmap is clean, nothing |
61 | * in flight) and the job is running in active mode */ | |
62 | bool actively_synced; | |
d63ffd87 | 63 | bool should_complete; |
eee13dfe | 64 | int64_t granularity; |
b812f671 | 65 | size_t buf_size; |
b21c7652 | 66 | int64_t bdev_length; |
b812f671 | 67 | unsigned long *cow_bitmap; |
e4654d2d | 68 | BdrvDirtyBitmap *dirty_bitmap; |
dc162c8e | 69 | BdrvDirtyBitmapIter *dbi; |
893f7eba | 70 | uint8_t *buf; |
402a4741 PB |
71 | QSIMPLEQ_HEAD(, MirrorBuffer) buf_free; |
72 | int buf_free_count; | |
bd48bde8 | 73 | |
49efb1f5 | 74 | uint64_t last_pause_ns; |
402a4741 | 75 | unsigned long *in_flight_bitmap; |
1b8f7776 | 76 | unsigned in_flight; |
b436982f | 77 | int64_t bytes_in_flight; |
b58deb34 | 78 | QTAILQ_HEAD(, MirrorOp) ops_in_flight; |
bd48bde8 | 79 | int ret; |
0fc9f8ea | 80 | bool unmap; |
b436982f | 81 | int target_cluster_size; |
e5b43573 | 82 | int max_iov; |
90ab48eb | 83 | bool initial_zeroing_ongoing; |
d06107ad | 84 | int in_active_write_counter; |
d69a879b | 85 | int64_t active_write_bytes_in_flight; |
737efc1e | 86 | bool prepared; |
5e771752 | 87 | bool in_drain; |
893f7eba PB |
88 | } MirrorBlockJob; |
89 | ||
429076e8 HR |
90 | typedef struct MirrorBDSOpaque { |
91 | MirrorBlockJob *job; | |
f94dc3b4 | 92 | bool stop; |
53431b90 | 93 | bool is_commit; |
429076e8 HR |
94 | } MirrorBDSOpaque; |
95 | ||
12aa4082 | 96 | struct MirrorOp { |
bd48bde8 PB |
97 | MirrorBlockJob *s; |
98 | QEMUIOVector qiov; | |
b436982f EB |
99 | int64_t offset; |
100 | uint64_t bytes; | |
2e1990b2 HR |
101 | |
102 | /* The pointee is set by mirror_co_read(), mirror_co_zero(), and | |
103 | * mirror_co_discard() before yielding for the first time */ | |
104 | int64_t *bytes_handled; | |
12aa4082 | 105 | |
1181e19a | 106 | bool is_pseudo_op; |
d06107ad | 107 | bool is_active_write; |
ce8cabbd | 108 | bool is_in_flight; |
12aa4082 | 109 | CoQueue waiting_requests; |
eed325b9 | 110 | Coroutine *co; |
d44dae1a | 111 | MirrorOp *waiting_for_op; |
12aa4082 HR |
112 | |
113 | QTAILQ_ENTRY(MirrorOp) next; | |
114 | }; | |
bd48bde8 | 115 | |
4295c5fc HR |
116 | typedef enum MirrorMethod { |
117 | MIRROR_METHOD_COPY, | |
118 | MIRROR_METHOD_ZERO, | |
119 | MIRROR_METHOD_DISCARD, | |
120 | } MirrorMethod; | |
121 | ||
b952b558 PB |
122 | static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read, |
123 | int error) | |
124 | { | |
d06107ad | 125 | s->actively_synced = false; |
b952b558 | 126 | if (read) { |
81e254dc KW |
127 | return block_job_error_action(&s->common, s->on_source_error, |
128 | true, error); | |
b952b558 | 129 | } else { |
81e254dc KW |
130 | return block_job_error_action(&s->common, s->on_target_error, |
131 | false, error); | |
b952b558 PB |
132 | } |
133 | } | |
134 | ||
1181e19a HR |
135 | static void coroutine_fn mirror_wait_on_conflicts(MirrorOp *self, |
136 | MirrorBlockJob *s, | |
137 | uint64_t offset, | |
138 | uint64_t bytes) | |
139 | { | |
140 | uint64_t self_start_chunk = offset / s->granularity; | |
141 | uint64_t self_end_chunk = DIV_ROUND_UP(offset + bytes, s->granularity); | |
142 | uint64_t self_nb_chunks = self_end_chunk - self_start_chunk; | |
143 | ||
144 | while (find_next_bit(s->in_flight_bitmap, self_end_chunk, | |
145 | self_start_chunk) < self_end_chunk && | |
146 | s->ret >= 0) | |
147 | { | |
148 | MirrorOp *op; | |
149 | ||
150 | QTAILQ_FOREACH(op, &s->ops_in_flight, next) { | |
151 | uint64_t op_start_chunk = op->offset / s->granularity; | |
152 | uint64_t op_nb_chunks = DIV_ROUND_UP(op->offset + op->bytes, | |
153 | s->granularity) - | |
154 | op_start_chunk; | |
155 | ||
156 | if (op == self) { | |
157 | continue; | |
158 | } | |
159 | ||
160 | if (ranges_overlap(self_start_chunk, self_nb_chunks, | |
161 | op_start_chunk, op_nb_chunks)) | |
162 | { | |
66fed30c SG |
163 | if (self) { |
164 | /* | |
165 | * If the operation is already (indirectly) waiting for us, | |
166 | * or will wait for us as soon as it wakes up, then just go | |
167 | * on (instead of producing a deadlock in the former case). | |
168 | */ | |
169 | if (op->waiting_for_op) { | |
170 | continue; | |
171 | } | |
172 | ||
173 | self->waiting_for_op = op; | |
d44dae1a VSO |
174 | } |
175 | ||
1181e19a | 176 | qemu_co_queue_wait(&op->waiting_requests, NULL); |
66fed30c SG |
177 | |
178 | if (self) { | |
179 | self->waiting_for_op = NULL; | |
180 | } | |
181 | ||
1181e19a HR |
182 | break; |
183 | } | |
184 | } | |
185 | } | |
186 | } | |
187 | ||
2e1990b2 | 188 | static void coroutine_fn mirror_iteration_done(MirrorOp *op, int ret) |
bd48bde8 PB |
189 | { |
190 | MirrorBlockJob *s = op->s; | |
402a4741 | 191 | struct iovec *iov; |
bd48bde8 | 192 | int64_t chunk_num; |
b436982f | 193 | int i, nb_chunks; |
bd48bde8 | 194 | |
b436982f | 195 | trace_mirror_iteration_done(s, op->offset, op->bytes, ret); |
bd48bde8 PB |
196 | |
197 | s->in_flight--; | |
b436982f | 198 | s->bytes_in_flight -= op->bytes; |
402a4741 PB |
199 | iov = op->qiov.iov; |
200 | for (i = 0; i < op->qiov.niov; i++) { | |
201 | MirrorBuffer *buf = (MirrorBuffer *) iov[i].iov_base; | |
202 | QSIMPLEQ_INSERT_TAIL(&s->buf_free, buf, next); | |
203 | s->buf_free_count++; | |
204 | } | |
205 | ||
b436982f EB |
206 | chunk_num = op->offset / s->granularity; |
207 | nb_chunks = DIV_ROUND_UP(op->bytes, s->granularity); | |
12aa4082 | 208 | |
402a4741 | 209 | bitmap_clear(s->in_flight_bitmap, chunk_num, nb_chunks); |
12aa4082 | 210 | QTAILQ_REMOVE(&s->ops_in_flight, op, next); |
b21c7652 HR |
211 | if (ret >= 0) { |
212 | if (s->cow_bitmap) { | |
213 | bitmap_set(s->cow_bitmap, chunk_num, nb_chunks); | |
214 | } | |
90ab48eb | 215 | if (!s->initial_zeroing_ongoing) { |
30a5c887 | 216 | job_progress_update(&s->common.job, op->bytes); |
90ab48eb | 217 | } |
bd48bde8 | 218 | } |
6df3bf8e | 219 | qemu_iovec_destroy(&op->qiov); |
7b770c72 | 220 | |
12aa4082 HR |
221 | qemu_co_queue_restart_all(&op->waiting_requests); |
222 | g_free(op); | |
bd48bde8 PB |
223 | } |
224 | ||
2e1990b2 | 225 | static void coroutine_fn mirror_write_complete(MirrorOp *op, int ret) |
bd48bde8 | 226 | { |
bd48bde8 | 227 | MirrorBlockJob *s = op->s; |
b9e413dd | 228 | |
bd48bde8 | 229 | if (ret < 0) { |
bd48bde8 PB |
230 | BlockErrorAction action; |
231 | ||
e0d7f73e | 232 | bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset, op->bytes); |
bd48bde8 | 233 | action = mirror_error_action(s, false, -ret); |
a589569f | 234 | if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { |
bd48bde8 PB |
235 | s->ret = ret; |
236 | } | |
237 | } | |
d12ade57 | 238 | |
bd48bde8 PB |
239 | mirror_iteration_done(op, ret); |
240 | } | |
241 | ||
2e1990b2 | 242 | static void coroutine_fn mirror_read_complete(MirrorOp *op, int ret) |
bd48bde8 | 243 | { |
bd48bde8 | 244 | MirrorBlockJob *s = op->s; |
b9e413dd | 245 | |
bd48bde8 | 246 | if (ret < 0) { |
bd48bde8 PB |
247 | BlockErrorAction action; |
248 | ||
e0d7f73e | 249 | bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset, op->bytes); |
bd48bde8 | 250 | action = mirror_error_action(s, true, -ret); |
a589569f | 251 | if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { |
bd48bde8 PB |
252 | s->ret = ret; |
253 | } | |
254 | ||
255 | mirror_iteration_done(op, ret); | |
d12ade57 | 256 | return; |
bd48bde8 | 257 | } |
d12ade57 VSO |
258 | |
259 | ret = blk_co_pwritev(s->target, op->offset, op->qiov.size, &op->qiov, 0); | |
260 | mirror_write_complete(op, ret); | |
bd48bde8 PB |
261 | } |
262 | ||
782d97ef EB |
263 | /* Clip bytes relative to offset to not exceed end-of-file */ |
264 | static inline int64_t mirror_clip_bytes(MirrorBlockJob *s, | |
265 | int64_t offset, | |
266 | int64_t bytes) | |
267 | { | |
268 | return MIN(bytes, s->bdev_length - offset); | |
269 | } | |
270 | ||
782d97ef EB |
271 | /* Round offset and/or bytes to target cluster if COW is needed, and |
272 | * return the offset of the adjusted tail against original. */ | |
17ac39c3 PB |
273 | static int coroutine_fn mirror_cow_align(MirrorBlockJob *s, int64_t *offset, |
274 | uint64_t *bytes) | |
893f7eba | 275 | { |
e5b43573 FZ |
276 | bool need_cow; |
277 | int ret = 0; | |
782d97ef | 278 | int64_t align_offset = *offset; |
7cfd5275 | 279 | int64_t align_bytes = *bytes; |
782d97ef | 280 | int max_bytes = s->granularity * s->max_iov; |
e5b43573 | 281 | |
782d97ef EB |
282 | need_cow = !test_bit(*offset / s->granularity, s->cow_bitmap); |
283 | need_cow |= !test_bit((*offset + *bytes - 1) / s->granularity, | |
e5b43573 FZ |
284 | s->cow_bitmap); |
285 | if (need_cow) { | |
fc6b211f AD |
286 | bdrv_round_to_subclusters(blk_bs(s->target), *offset, *bytes, |
287 | &align_offset, &align_bytes); | |
e5b43573 | 288 | } |
3515727f | 289 | |
782d97ef EB |
290 | if (align_bytes > max_bytes) { |
291 | align_bytes = max_bytes; | |
e5b43573 | 292 | if (need_cow) { |
782d97ef | 293 | align_bytes = QEMU_ALIGN_DOWN(align_bytes, s->target_cluster_size); |
e5b43573 | 294 | } |
8f0720ec | 295 | } |
782d97ef | 296 | /* Clipping may result in align_bytes unaligned to chunk boundary, but |
4150ae60 | 297 | * that doesn't matter because it's already the end of source image. */ |
782d97ef | 298 | align_bytes = mirror_clip_bytes(s, align_offset, align_bytes); |
8f0720ec | 299 | |
782d97ef EB |
300 | ret = align_offset + align_bytes - (*offset + *bytes); |
301 | *offset = align_offset; | |
302 | *bytes = align_bytes; | |
e5b43573 FZ |
303 | assert(ret >= 0); |
304 | return ret; | |
305 | } | |
306 | ||
537c3d4f | 307 | static inline void coroutine_fn |
eb994912 | 308 | mirror_wait_for_free_in_flight_slot(MirrorBlockJob *s) |
21cd917f | 309 | { |
12aa4082 HR |
310 | MirrorOp *op; |
311 | ||
1181e19a | 312 | QTAILQ_FOREACH(op, &s->ops_in_flight, next) { |
eb994912 HR |
313 | /* |
314 | * Do not wait on pseudo ops, because it may in turn wait on | |
1181e19a HR |
315 | * some other operation to start, which may in fact be the |
316 | * caller of this function. Since there is only one pseudo op | |
317 | * at any given time, we will always find some real operation | |
eb994912 HR |
318 | * to wait on. |
319 | * Also, do not wait on active operations, because they do not | |
320 | * use up in-flight slots. | |
321 | */ | |
322 | if (!op->is_pseudo_op && op->is_in_flight && !op->is_active_write) { | |
1181e19a HR |
323 | qemu_co_queue_wait(&op->waiting_requests, NULL); |
324 | return; | |
325 | } | |
326 | } | |
327 | abort(); | |
21cd917f FZ |
328 | } |
329 | ||
2e1990b2 HR |
330 | /* Perform a mirror copy operation. |
331 | * | |
332 | * *op->bytes_handled is set to the number of bytes copied after and | |
333 | * including offset, excluding any bytes copied prior to offset due | |
334 | * to alignment. This will be op->bytes if no alignment is necessary, | |
335 | * or (new_end - op->offset) if the tail is rounded up or down due to | |
336 | * alignment or buffer limit. | |
e5b43573 | 337 | */ |
2e1990b2 | 338 | static void coroutine_fn mirror_co_read(void *opaque) |
e5b43573 | 339 | { |
2e1990b2 HR |
340 | MirrorOp *op = opaque; |
341 | MirrorBlockJob *s = op->s; | |
ae4cc877 EB |
342 | int nb_chunks; |
343 | uint64_t ret; | |
ae4cc877 | 344 | uint64_t max_bytes; |
e5b43573 | 345 | |
ae4cc877 | 346 | max_bytes = s->granularity * s->max_iov; |
402a4741 | 347 | |
e5b43573 | 348 | /* We can only handle as much as buf_size at a time. */ |
2e1990b2 HR |
349 | op->bytes = MIN(s->buf_size, MIN(max_bytes, op->bytes)); |
350 | assert(op->bytes); | |
351 | assert(op->bytes < BDRV_REQUEST_MAX_BYTES); | |
352 | *op->bytes_handled = op->bytes; | |
402a4741 | 353 | |
e5b43573 | 354 | if (s->cow_bitmap) { |
2e1990b2 | 355 | *op->bytes_handled += mirror_cow_align(s, &op->offset, &op->bytes); |
e5b43573 | 356 | } |
2e1990b2 HR |
357 | /* Cannot exceed BDRV_REQUEST_MAX_BYTES + INT_MAX */ |
358 | assert(*op->bytes_handled <= UINT_MAX); | |
359 | assert(op->bytes <= s->buf_size); | |
ae4cc877 | 360 | /* The offset is granularity-aligned because: |
e5b43573 FZ |
361 | * 1) Caller passes in aligned values; |
362 | * 2) mirror_cow_align is used only when target cluster is larger. */ | |
2e1990b2 | 363 | assert(QEMU_IS_ALIGNED(op->offset, s->granularity)); |
ae4cc877 | 364 | /* The range is sector-aligned, since bdrv_getlength() rounds up. */ |
2e1990b2 HR |
365 | assert(QEMU_IS_ALIGNED(op->bytes, BDRV_SECTOR_SIZE)); |
366 | nb_chunks = DIV_ROUND_UP(op->bytes, s->granularity); | |
e5b43573 FZ |
367 | |
368 | while (s->buf_free_count < nb_chunks) { | |
2e1990b2 | 369 | trace_mirror_yield_in_flight(s, op->offset, s->in_flight); |
9178f4fe | 370 | mirror_wait_for_free_in_flight_slot(s); |
b812f671 PB |
371 | } |
372 | ||
402a4741 PB |
373 | /* Now make a QEMUIOVector taking enough granularity-sized chunks |
374 | * from s->buf_free. | |
375 | */ | |
376 | qemu_iovec_init(&op->qiov, nb_chunks); | |
402a4741 PB |
377 | while (nb_chunks-- > 0) { |
378 | MirrorBuffer *buf = QSIMPLEQ_FIRST(&s->buf_free); | |
2e1990b2 | 379 | size_t remaining = op->bytes - op->qiov.size; |
5a0f6fd5 | 380 | |
402a4741 PB |
381 | QSIMPLEQ_REMOVE_HEAD(&s->buf_free, next); |
382 | s->buf_free_count--; | |
5a0f6fd5 | 383 | qemu_iovec_add(&op->qiov, buf, MIN(s->granularity, remaining)); |
402a4741 | 384 | } |
bd48bde8 | 385 | |
893f7eba | 386 | /* Copy the dirty cluster. */ |
bd48bde8 | 387 | s->in_flight++; |
2e1990b2 | 388 | s->bytes_in_flight += op->bytes; |
ce8cabbd | 389 | op->is_in_flight = true; |
2e1990b2 | 390 | trace_mirror_one_iteration(s, op->offset, op->bytes); |
dcfb3beb | 391 | |
b9b10c35 KW |
392 | WITH_GRAPH_RDLOCK_GUARD() { |
393 | ret = bdrv_co_preadv(s->mirror_top_bs->backing, op->offset, op->bytes, | |
394 | &op->qiov, 0); | |
395 | } | |
2e1990b2 | 396 | mirror_read_complete(op, ret); |
e5b43573 FZ |
397 | } |
398 | ||
2e1990b2 | 399 | static void coroutine_fn mirror_co_zero(void *opaque) |
e5b43573 | 400 | { |
2e1990b2 HR |
401 | MirrorOp *op = opaque; |
402 | int ret; | |
e5b43573 | 403 | |
2e1990b2 HR |
404 | op->s->in_flight++; |
405 | op->s->bytes_in_flight += op->bytes; | |
406 | *op->bytes_handled = op->bytes; | |
ce8cabbd | 407 | op->is_in_flight = true; |
e5b43573 | 408 | |
2e1990b2 HR |
409 | ret = blk_co_pwrite_zeroes(op->s->target, op->offset, op->bytes, |
410 | op->s->unmap ? BDRV_REQ_MAY_UNMAP : 0); | |
411 | mirror_write_complete(op, ret); | |
412 | } | |
413 | ||
414 | static void coroutine_fn mirror_co_discard(void *opaque) | |
415 | { | |
416 | MirrorOp *op = opaque; | |
417 | int ret; | |
418 | ||
419 | op->s->in_flight++; | |
420 | op->s->bytes_in_flight += op->bytes; | |
421 | *op->bytes_handled = op->bytes; | |
ce8cabbd | 422 | op->is_in_flight = true; |
2e1990b2 HR |
423 | |
424 | ret = blk_co_pdiscard(op->s->target, op->offset, op->bytes); | |
425 | mirror_write_complete(op, ret); | |
e5b43573 FZ |
426 | } |
427 | ||
4295c5fc HR |
428 | static unsigned mirror_perform(MirrorBlockJob *s, int64_t offset, |
429 | unsigned bytes, MirrorMethod mirror_method) | |
430 | { | |
2e1990b2 HR |
431 | MirrorOp *op; |
432 | Coroutine *co; | |
433 | int64_t bytes_handled = -1; | |
434 | ||
435 | op = g_new(MirrorOp, 1); | |
436 | *op = (MirrorOp){ | |
437 | .s = s, | |
438 | .offset = offset, | |
439 | .bytes = bytes, | |
440 | .bytes_handled = &bytes_handled, | |
441 | }; | |
12aa4082 | 442 | qemu_co_queue_init(&op->waiting_requests); |
2e1990b2 | 443 | |
4295c5fc HR |
444 | switch (mirror_method) { |
445 | case MIRROR_METHOD_COPY: | |
2e1990b2 HR |
446 | co = qemu_coroutine_create(mirror_co_read, op); |
447 | break; | |
4295c5fc | 448 | case MIRROR_METHOD_ZERO: |
2e1990b2 HR |
449 | co = qemu_coroutine_create(mirror_co_zero, op); |
450 | break; | |
4295c5fc | 451 | case MIRROR_METHOD_DISCARD: |
2e1990b2 HR |
452 | co = qemu_coroutine_create(mirror_co_discard, op); |
453 | break; | |
4295c5fc HR |
454 | default: |
455 | abort(); | |
456 | } | |
eed325b9 | 457 | op->co = co; |
2e1990b2 | 458 | |
12aa4082 | 459 | QTAILQ_INSERT_TAIL(&s->ops_in_flight, op, next); |
2e1990b2 HR |
460 | qemu_coroutine_enter(co); |
461 | /* At this point, ownership of op has been moved to the coroutine | |
462 | * and the object may already be freed */ | |
463 | ||
464 | /* Assert that this value has been set */ | |
465 | assert(bytes_handled >= 0); | |
466 | ||
467 | /* Same assertion as in mirror_co_read() (and for mirror_co_read() | |
468 | * and mirror_co_discard(), bytes_handled == op->bytes, which | |
469 | * is the @bytes parameter given to this function) */ | |
470 | assert(bytes_handled <= UINT_MAX); | |
471 | return bytes_handled; | |
4295c5fc HR |
472 | } |
473 | ||
018e5987 | 474 | static void coroutine_fn mirror_iteration(MirrorBlockJob *s) |
e5b43573 | 475 | { |
138f9fff | 476 | BlockDriverState *source = s->mirror_top_bs->backing->bs; |
1181e19a HR |
477 | MirrorOp *pseudo_op; |
478 | int64_t offset; | |
e5b43573 FZ |
479 | /* At least the first dirty chunk is mirrored in one iteration. */ |
480 | int nb_chunks = 1; | |
4b5004d9 | 481 | bool write_zeroes_ok = bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)); |
b436982f | 482 | int max_io_bytes = MAX(s->buf_size / MAX_IN_FLIGHT, MAX_IO_BYTES); |
e5b43573 | 483 | |
b64bd51e | 484 | bdrv_dirty_bitmap_lock(s->dirty_bitmap); |
f798184c | 485 | offset = bdrv_dirty_iter_next(s->dbi); |
fb2ef791 | 486 | if (offset < 0) { |
dc162c8e | 487 | bdrv_set_dirty_iter(s->dbi, 0); |
f798184c | 488 | offset = bdrv_dirty_iter_next(s->dbi); |
9a46dba7 | 489 | trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap)); |
fb2ef791 | 490 | assert(offset >= 0); |
e5b43573 | 491 | } |
b64bd51e | 492 | bdrv_dirty_bitmap_unlock(s->dirty_bitmap); |
e5b43573 | 493 | |
d69a879b HR |
494 | /* |
495 | * Wait for concurrent requests to @offset. The next loop will limit the | |
496 | * copied area based on in_flight_bitmap so we only copy an area that does | |
497 | * not overlap with concurrent in-flight requests. Still, we would like to | |
498 | * copy something, so wait until there are at least no more requests to the | |
499 | * very beginning of the area. | |
500 | */ | |
1181e19a | 501 | mirror_wait_on_conflicts(NULL, s, offset, 1); |
9c83625b | 502 | |
da01ff7f | 503 | job_pause_point(&s->common.job); |
565ac01f | 504 | |
3202d8e4 | 505 | /* Find the number of consecutive dirty chunks following the first dirty |
e5b43573 | 506 | * one, and wait for in flight requests in them. */ |
b64bd51e | 507 | bdrv_dirty_bitmap_lock(s->dirty_bitmap); |
fb2ef791 | 508 | while (nb_chunks * s->granularity < s->buf_size) { |
dc162c8e | 509 | int64_t next_dirty; |
fb2ef791 EB |
510 | int64_t next_offset = offset + nb_chunks * s->granularity; |
511 | int64_t next_chunk = next_offset / s->granularity; | |
512 | if (next_offset >= s->bdev_length || | |
28636b82 | 513 | !bdrv_dirty_bitmap_get_locked(s->dirty_bitmap, next_offset)) { |
e5b43573 FZ |
514 | break; |
515 | } | |
516 | if (test_bit(next_chunk, s->in_flight_bitmap)) { | |
9c83625b | 517 | break; |
e5b43573 | 518 | } |
9c83625b | 519 | |
f798184c | 520 | next_dirty = bdrv_dirty_iter_next(s->dbi); |
fb2ef791 | 521 | if (next_dirty > next_offset || next_dirty < 0) { |
f27a2742 | 522 | /* The bitmap iterator's cache is stale, refresh it */ |
715a74d8 | 523 | bdrv_set_dirty_iter(s->dbi, next_offset); |
f798184c | 524 | next_dirty = bdrv_dirty_iter_next(s->dbi); |
f27a2742 | 525 | } |
fb2ef791 | 526 | assert(next_dirty == next_offset); |
9c83625b | 527 | nb_chunks++; |
e5b43573 FZ |
528 | } |
529 | ||
530 | /* Clear dirty bits before querying the block status, because | |
31826642 | 531 | * calling bdrv_block_status_above could yield - if some blocks are |
e5b43573 FZ |
532 | * marked dirty in this window, we need to know. |
533 | */ | |
e0d7f73e EB |
534 | bdrv_reset_dirty_bitmap_locked(s->dirty_bitmap, offset, |
535 | nb_chunks * s->granularity); | |
b64bd51e PB |
536 | bdrv_dirty_bitmap_unlock(s->dirty_bitmap); |
537 | ||
1181e19a HR |
538 | /* Before claiming an area in the in-flight bitmap, we have to |
539 | * create a MirrorOp for it so that conflicting requests can wait | |
540 | * for it. mirror_perform() will create the real MirrorOps later, | |
541 | * for now we just create a pseudo operation that will wake up all | |
542 | * conflicting requests once all real operations have been | |
543 | * launched. */ | |
544 | pseudo_op = g_new(MirrorOp, 1); | |
545 | *pseudo_op = (MirrorOp){ | |
546 | .offset = offset, | |
547 | .bytes = nb_chunks * s->granularity, | |
548 | .is_pseudo_op = true, | |
549 | }; | |
550 | qemu_co_queue_init(&pseudo_op->waiting_requests); | |
551 | QTAILQ_INSERT_TAIL(&s->ops_in_flight, pseudo_op, next); | |
552 | ||
fb2ef791 EB |
553 | bitmap_set(s->in_flight_bitmap, offset / s->granularity, nb_chunks); |
554 | while (nb_chunks > 0 && offset < s->bdev_length) { | |
31826642 | 555 | int ret; |
7cfd5275 | 556 | int64_t io_bytes; |
f3e4ce4a | 557 | int64_t io_bytes_acct; |
4295c5fc | 558 | MirrorMethod mirror_method = MIRROR_METHOD_COPY; |
e5b43573 | 559 | |
fb2ef791 | 560 | assert(!(offset % s->granularity)); |
7ff9579e KW |
561 | WITH_GRAPH_RDLOCK_GUARD() { |
562 | ret = bdrv_block_status_above(source, NULL, offset, | |
563 | nb_chunks * s->granularity, | |
564 | &io_bytes, NULL, NULL); | |
565 | } | |
e5b43573 | 566 | if (ret < 0) { |
fb2ef791 | 567 | io_bytes = MIN(nb_chunks * s->granularity, max_io_bytes); |
0965a41e | 568 | } else if (ret & BDRV_BLOCK_DATA) { |
fb2ef791 | 569 | io_bytes = MIN(io_bytes, max_io_bytes); |
e5b43573 FZ |
570 | } |
571 | ||
fb2ef791 EB |
572 | io_bytes -= io_bytes % s->granularity; |
573 | if (io_bytes < s->granularity) { | |
574 | io_bytes = s->granularity; | |
e5b43573 | 575 | } else if (ret >= 0 && !(ret & BDRV_BLOCK_DATA)) { |
fb2ef791 | 576 | int64_t target_offset; |
7cfd5275 | 577 | int64_t target_bytes; |
a00e70c0 | 578 | WITH_GRAPH_RDLOCK_GUARD() { |
fc6b211f AD |
579 | bdrv_round_to_subclusters(blk_bs(s->target), offset, io_bytes, |
580 | &target_offset, &target_bytes); | |
a00e70c0 | 581 | } |
fb2ef791 EB |
582 | if (target_offset == offset && |
583 | target_bytes == io_bytes) { | |
e5b43573 FZ |
584 | mirror_method = ret & BDRV_BLOCK_ZERO ? |
585 | MIRROR_METHOD_ZERO : | |
586 | MIRROR_METHOD_DISCARD; | |
587 | } | |
588 | } | |
589 | ||
cf56a3c6 | 590 | while (s->in_flight >= MAX_IN_FLIGHT) { |
fb2ef791 | 591 | trace_mirror_yield_in_flight(s, offset, s->in_flight); |
9178f4fe | 592 | mirror_wait_for_free_in_flight_slot(s); |
cf56a3c6 DL |
593 | } |
594 | ||
dbaa7b57 | 595 | if (s->ret < 0) { |
1181e19a HR |
596 | ret = 0; |
597 | goto fail; | |
dbaa7b57 VSO |
598 | } |
599 | ||
fb2ef791 | 600 | io_bytes = mirror_clip_bytes(s, offset, io_bytes); |
4295c5fc HR |
601 | io_bytes = mirror_perform(s, offset, io_bytes, mirror_method); |
602 | if (mirror_method != MIRROR_METHOD_COPY && write_zeroes_ok) { | |
603 | io_bytes_acct = 0; | |
604 | } else { | |
605 | io_bytes_acct = io_bytes; | |
e5b43573 | 606 | } |
fb2ef791 EB |
607 | assert(io_bytes); |
608 | offset += io_bytes; | |
609 | nb_chunks -= DIV_ROUND_UP(io_bytes, s->granularity); | |
018e5987 | 610 | block_job_ratelimit_processed_bytes(&s->common, io_bytes_acct); |
dcfb3beb | 611 | } |
1181e19a | 612 | |
1181e19a HR |
613 | fail: |
614 | QTAILQ_REMOVE(&s->ops_in_flight, pseudo_op, next); | |
615 | qemu_co_queue_restart_all(&pseudo_op->waiting_requests); | |
616 | g_free(pseudo_op); | |
bd48bde8 | 617 | } |
b952b558 | 618 | |
402a4741 PB |
619 | static void mirror_free_init(MirrorBlockJob *s) |
620 | { | |
621 | int granularity = s->granularity; | |
622 | size_t buf_size = s->buf_size; | |
623 | uint8_t *buf = s->buf; | |
624 | ||
625 | assert(s->buf_free_count == 0); | |
626 | QSIMPLEQ_INIT(&s->buf_free); | |
627 | while (buf_size != 0) { | |
628 | MirrorBuffer *cur = (MirrorBuffer *)buf; | |
629 | QSIMPLEQ_INSERT_TAIL(&s->buf_free, cur, next); | |
630 | s->buf_free_count++; | |
631 | buf_size -= granularity; | |
632 | buf += granularity; | |
633 | } | |
634 | } | |
635 | ||
bae8196d PB |
636 | /* This is also used for the .pause callback. There is no matching |
637 | * mirror_resume() because mirror_run() will begin iterating again | |
638 | * when the job is resumed. | |
639 | */ | |
537c3d4f | 640 | static void coroutine_fn mirror_wait_for_all_io(MirrorBlockJob *s) |
bd48bde8 PB |
641 | { |
642 | while (s->in_flight > 0) { | |
9178f4fe | 643 | mirror_wait_for_free_in_flight_slot(s); |
bd48bde8 | 644 | } |
893f7eba PB |
645 | } |
646 | ||
737efc1e JS |
647 | /** |
648 | * mirror_exit_common: handle both abort() and prepare() cases. | |
649 | * for .prepare, returns 0 on success and -errno on failure. | |
650 | * for .abort cases, denoted by abort = true, MUST return 0. | |
651 | */ | |
652 | static int mirror_exit_common(Job *job) | |
5a7e7a0b | 653 | { |
1908a559 KW |
654 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); |
655 | BlockJob *bjob = &s->common; | |
f93c3add | 656 | MirrorBDSOpaque *bs_opaque; |
5a7e7a0b | 657 | AioContext *replace_aio_context = NULL; |
f93c3add HR |
658 | BlockDriverState *src; |
659 | BlockDriverState *target_bs; | |
660 | BlockDriverState *mirror_top_bs; | |
12fa4af6 | 661 | Error *local_err = NULL; |
737efc1e JS |
662 | bool abort = job->ret < 0; |
663 | int ret = 0; | |
664 | ||
2626d27f KW |
665 | GLOBAL_STATE_CODE(); |
666 | ||
737efc1e JS |
667 | if (s->prepared) { |
668 | return 0; | |
669 | } | |
670 | s->prepared = true; | |
3f09bfbc | 671 | |
2626d27f KW |
672 | aio_context_acquire(qemu_get_aio_context()); |
673 | ||
f93c3add HR |
674 | mirror_top_bs = s->mirror_top_bs; |
675 | bs_opaque = mirror_top_bs->opaque; | |
676 | src = mirror_top_bs->backing->bs; | |
677 | target_bs = blk_bs(s->target); | |
678 | ||
ef53dc09 AG |
679 | if (bdrv_chain_contains(src, target_bs)) { |
680 | bdrv_unfreeze_backing_chain(mirror_top_bs, target_bs); | |
681 | } | |
682 | ||
5deb6cbd | 683 | bdrv_release_dirty_bitmap(s->dirty_bitmap); |
2119882c | 684 | |
7b508f6b JS |
685 | /* Make sure that the source BDS doesn't go away during bdrv_replace_node, |
686 | * before we can call bdrv_drained_end */ | |
3f09bfbc | 687 | bdrv_ref(src); |
4ef85a9c | 688 | bdrv_ref(mirror_top_bs); |
7d9fcb39 KW |
689 | bdrv_ref(target_bs); |
690 | ||
bb0c9409 VSO |
691 | /* |
692 | * Remove target parent that still uses BLK_PERM_WRITE/RESIZE before | |
7d9fcb39 | 693 | * inserting target_bs at s->to_replace, where we might not be able to get |
63c8ef28 | 694 | * these permissions. |
bb0c9409 | 695 | */ |
7d9fcb39 KW |
696 | blk_unref(s->target); |
697 | s->target = NULL; | |
4ef85a9c KW |
698 | |
699 | /* We don't access the source any more. Dropping any WRITE/RESIZE is | |
d2da5e28 KW |
700 | * required before it could become a backing file of target_bs. Not having |
701 | * these permissions any more means that we can't allow any new requests on | |
702 | * mirror_top_bs from now on, so keep it drained. */ | |
703 | bdrv_drained_begin(mirror_top_bs); | |
f94dc3b4 HR |
704 | bs_opaque->stop = true; |
705 | bdrv_child_refresh_perms(mirror_top_bs, mirror_top_bs->backing, | |
706 | &error_abort); | |
737efc1e | 707 | if (!abort && s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) { |
4ef85a9c | 708 | BlockDriverState *backing = s->is_none_mode ? src : s->base; |
3f072a7f HR |
709 | BlockDriverState *unfiltered_target = bdrv_skip_filters(target_bs); |
710 | ||
711 | if (bdrv_cow_bs(unfiltered_target) != backing) { | |
712 | bdrv_set_backing_hd(unfiltered_target, backing, &local_err); | |
12fa4af6 KW |
713 | if (local_err) { |
714 | error_report_err(local_err); | |
66c8672d | 715 | local_err = NULL; |
7b508f6b | 716 | ret = -EPERM; |
12fa4af6 | 717 | } |
4ef85a9c | 718 | } |
c41f5b96 HR |
719 | } else if (!abort && s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) { |
720 | assert(!bdrv_backing_chain_next(target_bs)); | |
721 | ret = bdrv_open_backing_file(bdrv_skip_filters(target_bs), NULL, | |
722 | "backing", &local_err); | |
723 | if (ret < 0) { | |
724 | error_report_err(local_err); | |
725 | local_err = NULL; | |
726 | } | |
4ef85a9c | 727 | } |
5a7e7a0b SH |
728 | |
729 | if (s->to_replace) { | |
730 | replace_aio_context = bdrv_get_aio_context(s->to_replace); | |
731 | aio_context_acquire(replace_aio_context); | |
732 | } | |
733 | ||
737efc1e JS |
734 | if (s->should_complete && !abort) { |
735 | BlockDriverState *to_replace = s->to_replace ?: src; | |
1ba79388 | 736 | bool ro = bdrv_is_read_only(to_replace); |
40365552 | 737 | |
1ba79388 AG |
738 | if (ro != bdrv_is_read_only(target_bs)) { |
739 | bdrv_reopen_set_read_only(target_bs, ro, NULL); | |
5a7e7a0b | 740 | } |
b8804815 KW |
741 | |
742 | /* The mirror job has no requests in flight any more, but we need to | |
743 | * drain potential other users of the BDS before changing the graph. */ | |
5e771752 | 744 | assert(s->in_drain); |
e253f4b8 | 745 | bdrv_drained_begin(target_bs); |
6e9cc051 HR |
746 | /* |
747 | * Cannot use check_to_replace_node() here, because that would | |
748 | * check for an op blocker on @to_replace, and we have our own | |
749 | * there. | |
533c6e4e KW |
750 | * |
751 | * TODO Pull out the writer lock from bdrv_replace_node() to here | |
6e9cc051 | 752 | */ |
533c6e4e | 753 | bdrv_graph_rdlock_main_loop(); |
6e9cc051 HR |
754 | if (bdrv_recurse_can_replace(src, to_replace)) { |
755 | bdrv_replace_node(to_replace, target_bs, &local_err); | |
756 | } else { | |
757 | error_setg(&local_err, "Can no longer replace '%s' by '%s', " | |
758 | "because it can no longer be guaranteed that doing so " | |
759 | "would not lead to an abrupt change of visible data", | |
760 | to_replace->node_name, target_bs->node_name); | |
761 | } | |
533c6e4e | 762 | bdrv_graph_rdunlock_main_loop(); |
e253f4b8 | 763 | bdrv_drained_end(target_bs); |
5fe31c25 KW |
764 | if (local_err) { |
765 | error_report_err(local_err); | |
7b508f6b | 766 | ret = -EPERM; |
5fe31c25 | 767 | } |
5a7e7a0b SH |
768 | } |
769 | if (s->to_replace) { | |
770 | bdrv_op_unblock_all(s->to_replace, s->replace_blocker); | |
771 | error_free(s->replace_blocker); | |
772 | bdrv_unref(s->to_replace); | |
773 | } | |
774 | if (replace_aio_context) { | |
775 | aio_context_release(replace_aio_context); | |
776 | } | |
777 | g_free(s->replaces); | |
7d9fcb39 | 778 | bdrv_unref(target_bs); |
4ef85a9c | 779 | |
f94dc3b4 HR |
780 | /* |
781 | * Remove the mirror filter driver from the graph. Before this, get rid of | |
4ef85a9c | 782 | * the blockers on the intermediate nodes so that the resulting state is |
f94dc3b4 HR |
783 | * valid. |
784 | */ | |
1908a559 | 785 | block_job_remove_all_bdrv(bjob); |
3f072a7f | 786 | bdrv_replace_node(mirror_top_bs, mirror_top_bs->backing->bs, &error_abort); |
4ef85a9c | 787 | |
429076e8 | 788 | bs_opaque->job = NULL; |
4ef85a9c | 789 | |
176c3699 | 790 | bdrv_drained_end(src); |
d2da5e28 | 791 | bdrv_drained_end(mirror_top_bs); |
5e771752 | 792 | s->in_drain = false; |
4ef85a9c | 793 | bdrv_unref(mirror_top_bs); |
3f09bfbc | 794 | bdrv_unref(src); |
7b508f6b | 795 | |
2626d27f KW |
796 | aio_context_release(qemu_get_aio_context()); |
797 | ||
737efc1e JS |
798 | return ret; |
799 | } | |
800 | ||
801 | static int mirror_prepare(Job *job) | |
802 | { | |
803 | return mirror_exit_common(job); | |
804 | } | |
805 | ||
806 | static void mirror_abort(Job *job) | |
807 | { | |
808 | int ret = mirror_exit_common(job); | |
809 | assert(ret == 0); | |
5a7e7a0b SH |
810 | } |
811 | ||
537c3d4f | 812 | static void coroutine_fn mirror_throttle(MirrorBlockJob *s) |
49efb1f5 DL |
813 | { |
814 | int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); | |
815 | ||
18bb6928 | 816 | if (now - s->last_pause_ns > BLOCK_JOB_SLICE_TIME) { |
49efb1f5 | 817 | s->last_pause_ns = now; |
5d43e86e | 818 | job_sleep_ns(&s->common.job, 0); |
49efb1f5 | 819 | } else { |
da01ff7f | 820 | job_pause_point(&s->common.job); |
49efb1f5 DL |
821 | } |
822 | } | |
823 | ||
c0b363ad DL |
824 | static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s) |
825 | { | |
23ca459a | 826 | int64_t offset; |
138f9fff | 827 | BlockDriverState *bs = s->mirror_top_bs->backing->bs; |
c0b363ad | 828 | BlockDriverState *target_bs = blk_bs(s->target); |
23ca459a | 829 | int ret; |
51b0a488 | 830 | int64_t count; |
c0b363ad | 831 | |
cdf3bc93 | 832 | if (s->zero_target) { |
c7c2769c | 833 | if (!bdrv_can_write_zeroes_with_unmap(target_bs)) { |
e0d7f73e | 834 | bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, s->bdev_length); |
c7c2769c DL |
835 | return 0; |
836 | } | |
837 | ||
90ab48eb | 838 | s->initial_zeroing_ongoing = true; |
23ca459a EB |
839 | for (offset = 0; offset < s->bdev_length; ) { |
840 | int bytes = MIN(s->bdev_length - offset, | |
841 | QEMU_ALIGN_DOWN(INT_MAX, s->granularity)); | |
c7c2769c DL |
842 | |
843 | mirror_throttle(s); | |
844 | ||
daa7f2f9 | 845 | if (job_is_cancelled(&s->common.job)) { |
90ab48eb | 846 | s->initial_zeroing_ongoing = false; |
c7c2769c DL |
847 | return 0; |
848 | } | |
849 | ||
850 | if (s->in_flight >= MAX_IN_FLIGHT) { | |
67adf4b3 EB |
851 | trace_mirror_yield(s, UINT64_MAX, s->buf_free_count, |
852 | s->in_flight); | |
9178f4fe | 853 | mirror_wait_for_free_in_flight_slot(s); |
c7c2769c DL |
854 | continue; |
855 | } | |
856 | ||
4295c5fc | 857 | mirror_perform(s, offset, bytes, MIRROR_METHOD_ZERO); |
23ca459a | 858 | offset += bytes; |
c7c2769c DL |
859 | } |
860 | ||
bae8196d | 861 | mirror_wait_for_all_io(s); |
90ab48eb | 862 | s->initial_zeroing_ongoing = false; |
b7d5062c DL |
863 | } |
864 | ||
c0b363ad | 865 | /* First part, loop on the sectors and initialize the dirty bitmap. */ |
23ca459a | 866 | for (offset = 0; offset < s->bdev_length; ) { |
c0b363ad | 867 | /* Just to make sure we are not exceeding int limit. */ |
23ca459a EB |
868 | int bytes = MIN(s->bdev_length - offset, |
869 | QEMU_ALIGN_DOWN(INT_MAX, s->granularity)); | |
c0b363ad DL |
870 | |
871 | mirror_throttle(s); | |
872 | ||
daa7f2f9 | 873 | if (job_is_cancelled(&s->common.job)) { |
c0b363ad DL |
874 | return 0; |
875 | } | |
876 | ||
7ff9579e KW |
877 | WITH_GRAPH_RDLOCK_GUARD() { |
878 | ret = bdrv_is_allocated_above(bs, s->base_overlay, true, offset, | |
879 | bytes, &count); | |
880 | } | |
c0b363ad DL |
881 | if (ret < 0) { |
882 | return ret; | |
883 | } | |
884 | ||
23ca459a | 885 | assert(count); |
a92b1b06 | 886 | if (ret > 0) { |
23ca459a | 887 | bdrv_set_dirty_bitmap(s->dirty_bitmap, offset, count); |
c0b363ad | 888 | } |
23ca459a | 889 | offset += count; |
c0b363ad DL |
890 | } |
891 | return 0; | |
892 | } | |
893 | ||
bdffb31d PB |
894 | /* Called when going out of the streaming phase to flush the bulk of the |
895 | * data to the medium, or just before completing. | |
896 | */ | |
26bef102 | 897 | static int coroutine_fn mirror_flush(MirrorBlockJob *s) |
bdffb31d | 898 | { |
26bef102 | 899 | int ret = blk_co_flush(s->target); |
bdffb31d PB |
900 | if (ret < 0) { |
901 | if (mirror_error_action(s, false, -ret) == BLOCK_ERROR_ACTION_REPORT) { | |
902 | s->ret = ret; | |
903 | } | |
904 | } | |
905 | return ret; | |
906 | } | |
907 | ||
f67432a2 | 908 | static int coroutine_fn mirror_run(Job *job, Error **errp) |
893f7eba | 909 | { |
f67432a2 | 910 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); |
138f9fff | 911 | BlockDriverState *bs = s->mirror_top_bs->backing->bs; |
32125b14 | 912 | MirrorBDSOpaque *mirror_top_opaque = s->mirror_top_bs->opaque; |
e253f4b8 | 913 | BlockDriverState *target_bs = blk_bs(s->target); |
9a0cec66 | 914 | bool need_drain = true; |
d59cb66d | 915 | BlockDeviceIoStatus iostatus; |
c0b363ad | 916 | int64_t length; |
e83dd680 | 917 | int64_t target_length; |
b812f671 | 918 | BlockDriverInfo bdi; |
1d33936e JC |
919 | char backing_filename[2]; /* we only need 2 characters because we are only |
920 | checking for a NULL string */ | |
893f7eba | 921 | int ret = 0; |
893f7eba | 922 | |
daa7f2f9 | 923 | if (job_is_cancelled(&s->common.job)) { |
893f7eba PB |
924 | goto immediate_exit; |
925 | } | |
926 | ||
8ab8140a | 927 | bdrv_graph_co_rdlock(); |
c86422c5 | 928 | s->bdev_length = bdrv_co_getlength(bs); |
8ab8140a KW |
929 | bdrv_graph_co_rdunlock(); |
930 | ||
b21c7652 HR |
931 | if (s->bdev_length < 0) { |
932 | ret = s->bdev_length; | |
373df5b1 | 933 | goto immediate_exit; |
becc347e KW |
934 | } |
935 | ||
c86422c5 | 936 | target_length = blk_co_getlength(s->target); |
e83dd680 KW |
937 | if (target_length < 0) { |
938 | ret = target_length; | |
939 | goto immediate_exit; | |
940 | } | |
941 | ||
becc347e KW |
942 | /* Active commit must resize the base image if its size differs from the |
943 | * active layer. */ | |
944 | if (s->base == blk_bs(s->target)) { | |
e83dd680 | 945 | if (s->bdev_length > target_length) { |
88276216 AF |
946 | ret = blk_co_truncate(s->target, s->bdev_length, false, |
947 | PREALLOC_MODE_OFF, 0, NULL); | |
becc347e KW |
948 | if (ret < 0) { |
949 | goto immediate_exit; | |
950 | } | |
951 | } | |
e83dd680 KW |
952 | } else if (s->bdev_length != target_length) { |
953 | error_setg(errp, "Source and target image have different sizes"); | |
954 | ret = -EINVAL; | |
955 | goto immediate_exit; | |
becc347e KW |
956 | } |
957 | ||
958 | if (s->bdev_length == 0) { | |
2e1795b5 KW |
959 | /* Transition to the READY state and wait for complete. */ |
960 | job_transition_to_ready(&s->common.job); | |
d06107ad | 961 | s->actively_synced = true; |
08b83bff | 962 | while (!job_cancel_requested(&s->common.job) && !s->should_complete) { |
198c49cc | 963 | job_yield(&s->common.job); |
9e48b025 | 964 | } |
9e48b025 | 965 | goto immediate_exit; |
893f7eba PB |
966 | } |
967 | ||
b21c7652 | 968 | length = DIV_ROUND_UP(s->bdev_length, s->granularity); |
402a4741 PB |
969 | s->in_flight_bitmap = bitmap_new(length); |
970 | ||
b812f671 PB |
971 | /* If we have no backing file yet in the destination, we cannot let |
972 | * the destination do COW. Instead, we copy sectors around the | |
973 | * dirty data if needed. We need a bitmap to do that. | |
974 | */ | |
e253f4b8 | 975 | bdrv_get_backing_filename(target_bs, backing_filename, |
b812f671 | 976 | sizeof(backing_filename)); |
a00e70c0 | 977 | bdrv_graph_co_rdlock(); |
3d47eb0a | 978 | if (!bdrv_co_get_info(target_bs, &bdi) && bdi.cluster_size) { |
b436982f EB |
979 | s->target_cluster_size = bdi.cluster_size; |
980 | } else { | |
981 | s->target_cluster_size = BDRV_SECTOR_SIZE; | |
e5b43573 | 982 | } |
a00e70c0 | 983 | bdrv_graph_co_rdunlock(); |
3f072a7f | 984 | if (backing_filename[0] && !bdrv_backing_chain_next(target_bs) && |
b436982f EB |
985 | s->granularity < s->target_cluster_size) { |
986 | s->buf_size = MAX(s->buf_size, s->target_cluster_size); | |
e5b43573 | 987 | s->cow_bitmap = bitmap_new(length); |
b812f671 | 988 | } |
e253f4b8 | 989 | s->max_iov = MIN(bs->bl.max_iov, target_bs->bl.max_iov); |
b812f671 | 990 | |
7504edf4 KW |
991 | s->buf = qemu_try_blockalign(bs, s->buf_size); |
992 | if (s->buf == NULL) { | |
993 | ret = -ENOMEM; | |
994 | goto immediate_exit; | |
995 | } | |
996 | ||
402a4741 | 997 | mirror_free_init(s); |
893f7eba | 998 | |
49efb1f5 | 999 | s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); |
03544a6e | 1000 | if (!s->is_none_mode) { |
c0b363ad | 1001 | ret = mirror_dirty_init(s); |
daa7f2f9 | 1002 | if (ret < 0 || job_is_cancelled(&s->common.job)) { |
c0b363ad | 1003 | goto immediate_exit; |
893f7eba PB |
1004 | } |
1005 | } | |
1006 | ||
32125b14 KW |
1007 | /* |
1008 | * Only now the job is fully initialised and mirror_top_bs should start | |
1009 | * accessing it. | |
1010 | */ | |
1011 | mirror_top_opaque->job = s; | |
1012 | ||
dc162c8e | 1013 | assert(!s->dbi); |
715a74d8 | 1014 | s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap); |
893f7eba | 1015 | for (;;) { |
49efb1f5 | 1016 | int64_t cnt, delta; |
893f7eba PB |
1017 | bool should_complete; |
1018 | ||
bd48bde8 PB |
1019 | if (s->ret < 0) { |
1020 | ret = s->ret; | |
1021 | goto immediate_exit; | |
1022 | } | |
1023 | ||
da01ff7f | 1024 | job_pause_point(&s->common.job); |
565ac01f | 1025 | |
4feeec7e HR |
1026 | if (job_is_cancelled(&s->common.job)) { |
1027 | ret = 0; | |
1028 | goto immediate_exit; | |
1029 | } | |
1030 | ||
20dca810 | 1031 | cnt = bdrv_get_dirty_count(s->dirty_bitmap); |
05df8a6a KW |
1032 | /* cnt is the number of dirty bytes remaining and s->bytes_in_flight is |
1033 | * the number of bytes currently being processed; together those are | |
1034 | * the current remaining operation length */ | |
d69a879b HR |
1035 | job_progress_set_remaining(&s->common.job, |
1036 | s->bytes_in_flight + cnt + | |
1037 | s->active_write_bytes_in_flight); | |
bd48bde8 PB |
1038 | |
1039 | /* Note that even when no rate limit is applied we need to yield | |
a7282330 | 1040 | * periodically with no pending I/O so that bdrv_drain_all() returns. |
18bb6928 KW |
1041 | * We do so every BLKOCK_JOB_SLICE_TIME nanoseconds, or when there is |
1042 | * an error, or when the source is clean, whichever comes first. */ | |
49efb1f5 | 1043 | delta = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->last_pause_ns; |
d59cb66d EGE |
1044 | WITH_JOB_LOCK_GUARD() { |
1045 | iostatus = s->common.iostatus; | |
1046 | } | |
18bb6928 | 1047 | if (delta < BLOCK_JOB_SLICE_TIME && |
d59cb66d | 1048 | iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
cf56a3c6 | 1049 | if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 || |
402a4741 | 1050 | (cnt == 0 && s->in_flight > 0)) { |
9a46dba7 | 1051 | trace_mirror_yield(s, cnt, s->buf_free_count, s->in_flight); |
9178f4fe | 1052 | mirror_wait_for_free_in_flight_slot(s); |
bd48bde8 PB |
1053 | continue; |
1054 | } else if (cnt != 0) { | |
018e5987 | 1055 | mirror_iteration(s); |
893f7eba | 1056 | } |
893f7eba PB |
1057 | } |
1058 | ||
1059 | should_complete = false; | |
bd48bde8 | 1060 | if (s->in_flight == 0 && cnt == 0) { |
893f7eba | 1061 | trace_mirror_before_flush(s); |
44716224 | 1062 | if (!job_is_ready(&s->common.job)) { |
bdffb31d PB |
1063 | if (mirror_flush(s) < 0) { |
1064 | /* Go check s->ret. */ | |
1065 | continue; | |
b952b558 | 1066 | } |
b952b558 PB |
1067 | /* We're out of the streaming phase. From now on, if the job |
1068 | * is cancelled we will actually complete all pending I/O and | |
1069 | * report completion. This way, block-job-cancel will leave | |
1070 | * the target in a consistent state. | |
1071 | */ | |
2e1795b5 | 1072 | job_transition_to_ready(&s->common.job); |
d06107ad HR |
1073 | if (s->copy_mode != MIRROR_COPY_MODE_BACKGROUND) { |
1074 | s->actively_synced = true; | |
1075 | } | |
d63ffd87 | 1076 | } |
bdffb31d PB |
1077 | |
1078 | should_complete = s->should_complete || | |
08b83bff | 1079 | job_cancel_requested(&s->common.job); |
bdffb31d | 1080 | cnt = bdrv_get_dirty_count(s->dirty_bitmap); |
893f7eba PB |
1081 | } |
1082 | ||
1083 | if (cnt == 0 && should_complete) { | |
1084 | /* The dirty bitmap is not updated while operations are pending. | |
1085 | * If we're about to exit, wait for pending operations before | |
1086 | * calling bdrv_get_dirty_count(bs), or we may exit while the | |
1087 | * source has dirty data to copy! | |
1088 | * | |
1089 | * Note that I/O can be submitted by the guest while | |
9a0cec66 PB |
1090 | * mirror_populate runs, so pause it now. Before deciding |
1091 | * whether to switch to target check one last time if I/O has | |
1092 | * come in the meanwhile, and if not flush the data to disk. | |
893f7eba | 1093 | */ |
9a46dba7 | 1094 | trace_mirror_before_drain(s, cnt); |
9a0cec66 | 1095 | |
5e771752 | 1096 | s->in_drain = true; |
9a0cec66 | 1097 | bdrv_drained_begin(bs); |
d69a879b HR |
1098 | |
1099 | /* Must be zero because we are drained */ | |
1100 | assert(s->in_active_write_counter == 0); | |
1101 | ||
20dca810 | 1102 | cnt = bdrv_get_dirty_count(s->dirty_bitmap); |
bdffb31d | 1103 | if (cnt > 0 || mirror_flush(s) < 0) { |
9a0cec66 | 1104 | bdrv_drained_end(bs); |
5e771752 | 1105 | s->in_drain = false; |
9a0cec66 PB |
1106 | continue; |
1107 | } | |
1108 | ||
1109 | /* The two disks are in sync. Exit and report successful | |
1110 | * completion. | |
1111 | */ | |
1112 | assert(QLIST_EMPTY(&bs->tracked_requests)); | |
9a0cec66 PB |
1113 | need_drain = false; |
1114 | break; | |
893f7eba PB |
1115 | } |
1116 | ||
44716224 | 1117 | if (job_is_ready(&s->common.job) && !should_complete) { |
018e5987 KW |
1118 | if (s->in_flight == 0 && cnt == 0) { |
1119 | trace_mirror_before_sleep(s, cnt, job_is_ready(&s->common.job), | |
1120 | BLOCK_JOB_SLICE_TIME); | |
1121 | job_sleep_ns(&s->common.job, BLOCK_JOB_SLICE_TIME); | |
1122 | } | |
1123 | } else { | |
1124 | block_job_ratelimit_sleep(&s->common); | |
ddc4115e | 1125 | } |
49efb1f5 | 1126 | s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); |
893f7eba PB |
1127 | } |
1128 | ||
1129 | immediate_exit: | |
bd48bde8 PB |
1130 | if (s->in_flight > 0) { |
1131 | /* We get here only if something went wrong. Either the job failed, | |
1132 | * or it was cancelled prematurely so that we do not guarantee that | |
1133 | * the target is a copy of the source. | |
1134 | */ | |
08b83bff | 1135 | assert(ret < 0 || job_is_cancelled(&s->common.job)); |
9a0cec66 | 1136 | assert(need_drain); |
bae8196d | 1137 | mirror_wait_for_all_io(s); |
bd48bde8 PB |
1138 | } |
1139 | ||
1140 | assert(s->in_flight == 0); | |
7191bf31 | 1141 | qemu_vfree(s->buf); |
b812f671 | 1142 | g_free(s->cow_bitmap); |
402a4741 | 1143 | g_free(s->in_flight_bitmap); |
dc162c8e | 1144 | bdrv_dirty_iter_free(s->dbi); |
5a7e7a0b | 1145 | |
9a0cec66 | 1146 | if (need_drain) { |
5e771752 | 1147 | s->in_drain = true; |
9a0cec66 PB |
1148 | bdrv_drained_begin(bs); |
1149 | } | |
f67432a2 | 1150 | |
f67432a2 | 1151 | return ret; |
893f7eba PB |
1152 | } |
1153 | ||
3453d972 | 1154 | static void mirror_complete(Job *job, Error **errp) |
d63ffd87 | 1155 | { |
3453d972 | 1156 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); |
d63ffd87 | 1157 | |
44716224 | 1158 | if (!job_is_ready(job)) { |
9df229c3 | 1159 | error_setg(errp, "The active block job '%s' cannot be completed", |
3453d972 | 1160 | job->id); |
d63ffd87 PB |
1161 | return; |
1162 | } | |
1163 | ||
15d67298 | 1164 | /* block all operations on to_replace bs */ |
09158f00 | 1165 | if (s->replaces) { |
5a7e7a0b SH |
1166 | AioContext *replace_aio_context; |
1167 | ||
e12f3784 | 1168 | s->to_replace = bdrv_find_node(s->replaces); |
09158f00 | 1169 | if (!s->to_replace) { |
e12f3784 | 1170 | error_setg(errp, "Node name '%s' not found", s->replaces); |
09158f00 BC |
1171 | return; |
1172 | } | |
1173 | ||
5a7e7a0b SH |
1174 | replace_aio_context = bdrv_get_aio_context(s->to_replace); |
1175 | aio_context_acquire(replace_aio_context); | |
1176 | ||
64631f36 | 1177 | /* TODO Translate this into child freeze system. */ |
09158f00 BC |
1178 | error_setg(&s->replace_blocker, |
1179 | "block device is in use by block-job-complete"); | |
1180 | bdrv_op_block_all(s->to_replace, s->replace_blocker); | |
1181 | bdrv_ref(s->to_replace); | |
5a7e7a0b SH |
1182 | |
1183 | aio_context_release(replace_aio_context); | |
09158f00 BC |
1184 | } |
1185 | ||
d63ffd87 | 1186 | s->should_complete = true; |
00769414 HR |
1187 | |
1188 | /* If the job is paused, it will be re-entered when it is resumed */ | |
279ac06e EGE |
1189 | WITH_JOB_LOCK_GUARD() { |
1190 | if (!job->paused) { | |
1191 | job_enter_cond_locked(job, NULL); | |
1192 | } | |
00769414 | 1193 | } |
d63ffd87 PB |
1194 | } |
1195 | ||
537c3d4f | 1196 | static void coroutine_fn mirror_pause(Job *job) |
565ac01f | 1197 | { |
da01ff7f | 1198 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); |
565ac01f | 1199 | |
bae8196d | 1200 | mirror_wait_for_all_io(s); |
565ac01f SH |
1201 | } |
1202 | ||
89bd0305 KW |
1203 | static bool mirror_drained_poll(BlockJob *job) |
1204 | { | |
1205 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
5e771752 SL |
1206 | |
1207 | /* If the job isn't paused nor cancelled, we can't be sure that it won't | |
1208 | * issue more requests. We make an exception if we've reached this point | |
1209 | * from one of our own drain sections, to avoid a deadlock waiting for | |
1210 | * ourselves. | |
1211 | */ | |
279ac06e EGE |
1212 | WITH_JOB_LOCK_GUARD() { |
1213 | if (!s->common.job.paused && !job_is_cancelled_locked(&job->job) | |
1214 | && !s->in_drain) { | |
1215 | return true; | |
1216 | } | |
5e771752 SL |
1217 | } |
1218 | ||
89bd0305 KW |
1219 | return !!s->in_flight; |
1220 | } | |
1221 | ||
73895f38 | 1222 | static bool mirror_cancel(Job *job, bool force) |
521ff8b7 VSO |
1223 | { |
1224 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); | |
1225 | BlockDriverState *target = blk_bs(s->target); | |
1226 | ||
73895f38 HR |
1227 | /* |
1228 | * Before the job is READY, we treat any cancellation like a | |
1229 | * force-cancellation. | |
1230 | */ | |
1231 | force = force || !job_is_ready(job); | |
1232 | ||
1233 | if (force) { | |
9c785cd7 VSO |
1234 | bdrv_cancel_in_flight(target); |
1235 | } | |
73895f38 HR |
1236 | return force; |
1237 | } | |
1238 | ||
1239 | static bool commit_active_cancel(Job *job, bool force) | |
1240 | { | |
1241 | /* Same as above in mirror_cancel() */ | |
1242 | return force || !job_is_ready(job); | |
521ff8b7 VSO |
1243 | } |
1244 | ||
3fc4b10a | 1245 | static const BlockJobDriver mirror_job_driver = { |
33e9e9bd KW |
1246 | .job_driver = { |
1247 | .instance_size = sizeof(MirrorBlockJob), | |
252291ea | 1248 | .job_type = JOB_TYPE_MIRROR, |
80fa2c75 | 1249 | .free = block_job_free, |
b15de828 | 1250 | .user_resume = block_job_user_resume, |
f67432a2 | 1251 | .run = mirror_run, |
737efc1e JS |
1252 | .prepare = mirror_prepare, |
1253 | .abort = mirror_abort, | |
da01ff7f | 1254 | .pause = mirror_pause, |
3453d972 | 1255 | .complete = mirror_complete, |
521ff8b7 | 1256 | .cancel = mirror_cancel, |
33e9e9bd | 1257 | }, |
89bd0305 | 1258 | .drained_poll = mirror_drained_poll, |
893f7eba PB |
1259 | }; |
1260 | ||
03544a6e | 1261 | static const BlockJobDriver commit_active_job_driver = { |
33e9e9bd KW |
1262 | .job_driver = { |
1263 | .instance_size = sizeof(MirrorBlockJob), | |
252291ea | 1264 | .job_type = JOB_TYPE_COMMIT, |
80fa2c75 | 1265 | .free = block_job_free, |
b15de828 | 1266 | .user_resume = block_job_user_resume, |
f67432a2 | 1267 | .run = mirror_run, |
737efc1e JS |
1268 | .prepare = mirror_prepare, |
1269 | .abort = mirror_abort, | |
da01ff7f | 1270 | .pause = mirror_pause, |
3453d972 | 1271 | .complete = mirror_complete, |
73895f38 | 1272 | .cancel = commit_active_cancel, |
33e9e9bd | 1273 | }, |
89bd0305 | 1274 | .drained_poll = mirror_drained_poll, |
03544a6e FZ |
1275 | }; |
1276 | ||
537c3d4f SH |
1277 | static void coroutine_fn |
1278 | do_sync_target_write(MirrorBlockJob *job, MirrorMethod method, | |
1279 | uint64_t offset, uint64_t bytes, | |
1280 | QEMUIOVector *qiov, int flags) | |
d06107ad | 1281 | { |
5c511ac3 | 1282 | int ret; |
dbdf699c VSO |
1283 | size_t qiov_offset = 0; |
1284 | int64_t bitmap_offset, bitmap_end; | |
d06107ad | 1285 | |
dbdf699c VSO |
1286 | if (!QEMU_IS_ALIGNED(offset, job->granularity) && |
1287 | bdrv_dirty_bitmap_get(job->dirty_bitmap, offset)) | |
1288 | { | |
1289 | /* | |
1290 | * Dirty unaligned padding: ignore it. | |
1291 | * | |
1292 | * Reasoning: | |
1293 | * 1. If we copy it, we can't reset corresponding bit in | |
1294 | * dirty_bitmap as there may be some "dirty" bytes still not | |
1295 | * copied. | |
1296 | * 2. It's already dirty, so skipping it we don't diverge mirror | |
1297 | * progress. | |
1298 | * | |
1299 | * Note, that because of this, guest write may have no contribution | |
1300 | * into mirror converge, but that's not bad, as we have background | |
1301 | * process of mirroring. If under some bad circumstances (high guest | |
1302 | * IO load) background process starve, we will not converge anyway, | |
1303 | * even if each write will contribute, as guest is not guaranteed to | |
1304 | * rewrite the whole disk. | |
1305 | */ | |
1306 | qiov_offset = QEMU_ALIGN_UP(offset, job->granularity) - offset; | |
1307 | if (bytes <= qiov_offset) { | |
1308 | /* nothing to do after shrink */ | |
1309 | return; | |
1310 | } | |
1311 | offset += qiov_offset; | |
1312 | bytes -= qiov_offset; | |
1313 | } | |
1314 | ||
1315 | if (!QEMU_IS_ALIGNED(offset + bytes, job->granularity) && | |
1316 | bdrv_dirty_bitmap_get(job->dirty_bitmap, offset + bytes - 1)) | |
1317 | { | |
1318 | uint64_t tail = (offset + bytes) % job->granularity; | |
1319 | ||
1320 | if (bytes <= tail) { | |
1321 | /* nothing to do after shrink */ | |
1322 | return; | |
1323 | } | |
1324 | bytes -= tail; | |
1325 | } | |
1326 | ||
1327 | /* | |
1328 | * Tails are either clean or shrunk, so for bitmap resetting | |
1329 | * we safely align the range down. | |
1330 | */ | |
1331 | bitmap_offset = QEMU_ALIGN_UP(offset, job->granularity); | |
1332 | bitmap_end = QEMU_ALIGN_DOWN(offset + bytes, job->granularity); | |
1333 | if (bitmap_offset < bitmap_end) { | |
1334 | bdrv_reset_dirty_bitmap(job->dirty_bitmap, bitmap_offset, | |
1335 | bitmap_end - bitmap_offset); | |
1336 | } | |
d06107ad | 1337 | |
5c511ac3 | 1338 | job_progress_increase_remaining(&job->common.job, bytes); |
d69a879b | 1339 | job->active_write_bytes_in_flight += bytes; |
d06107ad | 1340 | |
5c511ac3 VSO |
1341 | switch (method) { |
1342 | case MIRROR_METHOD_COPY: | |
dbdf699c VSO |
1343 | ret = blk_co_pwritev_part(job->target, offset, bytes, |
1344 | qiov, qiov_offset, flags); | |
5c511ac3 | 1345 | break; |
d06107ad | 1346 | |
5c511ac3 VSO |
1347 | case MIRROR_METHOD_ZERO: |
1348 | assert(!qiov); | |
1349 | ret = blk_co_pwrite_zeroes(job->target, offset, bytes, flags); | |
1350 | break; | |
d06107ad | 1351 | |
5c511ac3 VSO |
1352 | case MIRROR_METHOD_DISCARD: |
1353 | assert(!qiov); | |
1354 | ret = blk_co_pdiscard(job->target, offset, bytes); | |
1355 | break; | |
d06107ad | 1356 | |
5c511ac3 VSO |
1357 | default: |
1358 | abort(); | |
1359 | } | |
d06107ad | 1360 | |
d69a879b | 1361 | job->active_write_bytes_in_flight -= bytes; |
5c511ac3 VSO |
1362 | if (ret >= 0) { |
1363 | job_progress_update(&job->common.job, bytes); | |
1364 | } else { | |
1365 | BlockErrorAction action; | |
d06107ad | 1366 | |
dbdf699c VSO |
1367 | /* |
1368 | * We failed, so we should mark dirty the whole area, aligned up. | |
1369 | * Note that we don't care about shrunk tails if any: they were dirty | |
1370 | * at function start, and they must be still dirty, as we've locked | |
1371 | * the region for in-flight op. | |
1372 | */ | |
1373 | bitmap_offset = QEMU_ALIGN_DOWN(offset, job->granularity); | |
1374 | bitmap_end = QEMU_ALIGN_UP(offset + bytes, job->granularity); | |
1375 | bdrv_set_dirty_bitmap(job->dirty_bitmap, bitmap_offset, | |
1376 | bitmap_end - bitmap_offset); | |
5c511ac3 | 1377 | job->actively_synced = false; |
d06107ad | 1378 | |
5c511ac3 VSO |
1379 | action = mirror_error_action(job, false, -ret); |
1380 | if (action == BLOCK_ERROR_ACTION_REPORT) { | |
1381 | if (!job->ret) { | |
1382 | job->ret = ret; | |
d06107ad HR |
1383 | } |
1384 | } | |
d06107ad HR |
1385 | } |
1386 | } | |
1387 | ||
1388 | static MirrorOp *coroutine_fn active_write_prepare(MirrorBlockJob *s, | |
1389 | uint64_t offset, | |
1390 | uint64_t bytes) | |
1391 | { | |
1392 | MirrorOp *op; | |
1393 | uint64_t start_chunk = offset / s->granularity; | |
1394 | uint64_t end_chunk = DIV_ROUND_UP(offset + bytes, s->granularity); | |
1395 | ||
1396 | op = g_new(MirrorOp, 1); | |
1397 | *op = (MirrorOp){ | |
1398 | .s = s, | |
1399 | .offset = offset, | |
1400 | .bytes = bytes, | |
1401 | .is_active_write = true, | |
ce8cabbd | 1402 | .is_in_flight = true, |
ead3f1bf | 1403 | .co = qemu_coroutine_self(), |
d06107ad HR |
1404 | }; |
1405 | qemu_co_queue_init(&op->waiting_requests); | |
1406 | QTAILQ_INSERT_TAIL(&s->ops_in_flight, op, next); | |
1407 | ||
1408 | s->in_active_write_counter++; | |
1409 | ||
d69a879b HR |
1410 | /* |
1411 | * Wait for concurrent requests affecting the area. If there are already | |
1412 | * running requests that are copying off now-to-be stale data in the area, | |
1413 | * we must wait for them to finish before we begin writing fresh data to the | |
1414 | * target so that the write operations appear in the correct order. | |
1415 | * Note that background requests (see mirror_iteration()) in contrast only | |
1416 | * wait for conflicting requests at the start of the dirty area, and then | |
1417 | * (based on the in_flight_bitmap) truncate the area to copy so it will not | |
1418 | * conflict with any requests beyond that. For active writes, however, we | |
1419 | * cannot truncate that area. The request from our parent must be blocked | |
1420 | * until the area is copied in full. Therefore, we must wait for the whole | |
1421 | * area to become free of concurrent requests. | |
1422 | */ | |
d06107ad HR |
1423 | mirror_wait_on_conflicts(op, s, offset, bytes); |
1424 | ||
1425 | bitmap_set(s->in_flight_bitmap, start_chunk, end_chunk - start_chunk); | |
1426 | ||
1427 | return op; | |
1428 | } | |
1429 | ||
9c93652d | 1430 | static void coroutine_fn GRAPH_RDLOCK active_write_settle(MirrorOp *op) |
d06107ad HR |
1431 | { |
1432 | uint64_t start_chunk = op->offset / op->s->granularity; | |
1433 | uint64_t end_chunk = DIV_ROUND_UP(op->offset + op->bytes, | |
1434 | op->s->granularity); | |
1435 | ||
1436 | if (!--op->s->in_active_write_counter && op->s->actively_synced) { | |
1437 | BdrvChild *source = op->s->mirror_top_bs->backing; | |
1438 | ||
1439 | if (QLIST_FIRST(&source->bs->parents) == source && | |
1440 | QLIST_NEXT(source, next_parent) == NULL) | |
1441 | { | |
1442 | /* Assert that we are back in sync once all active write | |
1443 | * operations are settled. | |
1444 | * Note that we can only assert this if the mirror node | |
1445 | * is the source node's only parent. */ | |
1446 | assert(!bdrv_get_dirty_count(op->s->dirty_bitmap)); | |
1447 | } | |
1448 | } | |
1449 | bitmap_clear(op->s->in_flight_bitmap, start_chunk, end_chunk - start_chunk); | |
1450 | QTAILQ_REMOVE(&op->s->ops_in_flight, op, next); | |
1451 | qemu_co_queue_restart_all(&op->waiting_requests); | |
1452 | g_free(op); | |
1453 | } | |
1454 | ||
b9b10c35 KW |
1455 | static int coroutine_fn GRAPH_RDLOCK |
1456 | bdrv_mirror_top_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
1457 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
4ef85a9c KW |
1458 | { |
1459 | return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags); | |
1460 | } | |
1461 | ||
9a5a1c62 EGE |
1462 | static int coroutine_fn GRAPH_RDLOCK |
1463 | bdrv_mirror_top_do_write(BlockDriverState *bs, MirrorMethod method, | |
1464 | uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, | |
1465 | int flags) | |
d06107ad HR |
1466 | { |
1467 | MirrorOp *op = NULL; | |
1468 | MirrorBDSOpaque *s = bs->opaque; | |
1469 | int ret = 0; | |
da93d5c8 | 1470 | bool copy_to_target = false; |
d06107ad | 1471 | |
da93d5c8 HR |
1472 | if (s->job) { |
1473 | copy_to_target = s->job->ret >= 0 && | |
1474 | !job_is_cancelled(&s->job->common.job) && | |
1475 | s->job->copy_mode == MIRROR_COPY_MODE_WRITE_BLOCKING; | |
1476 | } | |
d06107ad HR |
1477 | |
1478 | if (copy_to_target) { | |
1479 | op = active_write_prepare(s->job, offset, bytes); | |
1480 | } | |
1481 | ||
1482 | switch (method) { | |
1483 | case MIRROR_METHOD_COPY: | |
1484 | ret = bdrv_co_pwritev(bs->backing, offset, bytes, qiov, flags); | |
1485 | break; | |
1486 | ||
1487 | case MIRROR_METHOD_ZERO: | |
1488 | ret = bdrv_co_pwrite_zeroes(bs->backing, offset, bytes, flags); | |
1489 | break; | |
1490 | ||
1491 | case MIRROR_METHOD_DISCARD: | |
0b9fd3f4 | 1492 | ret = bdrv_co_pdiscard(bs->backing, offset, bytes); |
d06107ad HR |
1493 | break; |
1494 | ||
1495 | default: | |
1496 | abort(); | |
1497 | } | |
1498 | ||
1499 | if (ret < 0) { | |
1500 | goto out; | |
1501 | } | |
1502 | ||
1503 | if (copy_to_target) { | |
1504 | do_sync_target_write(s->job, method, offset, bytes, qiov, flags); | |
1505 | } | |
1506 | ||
1507 | out: | |
1508 | if (copy_to_target) { | |
1509 | active_write_settle(op); | |
1510 | } | |
1511 | return ret; | |
1512 | } | |
1513 | ||
b9b10c35 KW |
1514 | static int coroutine_fn GRAPH_RDLOCK |
1515 | bdrv_mirror_top_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
1516 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
4ef85a9c | 1517 | { |
d06107ad HR |
1518 | MirrorBDSOpaque *s = bs->opaque; |
1519 | QEMUIOVector bounce_qiov; | |
1520 | void *bounce_buf; | |
1521 | int ret = 0; | |
da93d5c8 | 1522 | bool copy_to_target = false; |
d06107ad | 1523 | |
da93d5c8 HR |
1524 | if (s->job) { |
1525 | copy_to_target = s->job->ret >= 0 && | |
1526 | !job_is_cancelled(&s->job->common.job) && | |
1527 | s->job->copy_mode == MIRROR_COPY_MODE_WRITE_BLOCKING; | |
1528 | } | |
d06107ad HR |
1529 | |
1530 | if (copy_to_target) { | |
1531 | /* The guest might concurrently modify the data to write; but | |
1532 | * the data on source and destination must match, so we have | |
1533 | * to use a bounce buffer if we are going to write to the | |
1534 | * target now. */ | |
1535 | bounce_buf = qemu_blockalign(bs, bytes); | |
1536 | iov_to_buf_full(qiov->iov, qiov->niov, 0, bounce_buf, bytes); | |
1537 | ||
1538 | qemu_iovec_init(&bounce_qiov, 1); | |
1539 | qemu_iovec_add(&bounce_qiov, bounce_buf, bytes); | |
1540 | qiov = &bounce_qiov; | |
e8b65355 SH |
1541 | |
1542 | flags &= ~BDRV_REQ_REGISTERED_BUF; | |
d06107ad HR |
1543 | } |
1544 | ||
1545 | ret = bdrv_mirror_top_do_write(bs, MIRROR_METHOD_COPY, offset, bytes, qiov, | |
1546 | flags); | |
1547 | ||
1548 | if (copy_to_target) { | |
1549 | qemu_iovec_destroy(&bounce_qiov); | |
1550 | qemu_vfree(bounce_buf); | |
1551 | } | |
1552 | ||
1553 | return ret; | |
4ef85a9c KW |
1554 | } |
1555 | ||
88095349 | 1556 | static int coroutine_fn GRAPH_RDLOCK bdrv_mirror_top_flush(BlockDriverState *bs) |
4ef85a9c | 1557 | { |
ce960aa9 VSO |
1558 | if (bs->backing == NULL) { |
1559 | /* we can be here after failed bdrv_append in mirror_start_job */ | |
1560 | return 0; | |
1561 | } | |
4ef85a9c KW |
1562 | return bdrv_co_flush(bs->backing->bs); |
1563 | } | |
1564 | ||
abaf8b75 KW |
1565 | static int coroutine_fn GRAPH_RDLOCK |
1566 | bdrv_mirror_top_pwrite_zeroes(BlockDriverState *bs, int64_t offset, | |
1567 | int64_t bytes, BdrvRequestFlags flags) | |
4ef85a9c | 1568 | { |
d06107ad HR |
1569 | return bdrv_mirror_top_do_write(bs, MIRROR_METHOD_ZERO, offset, bytes, NULL, |
1570 | flags); | |
4ef85a9c KW |
1571 | } |
1572 | ||
9a5a1c62 EGE |
1573 | static int coroutine_fn GRAPH_RDLOCK |
1574 | bdrv_mirror_top_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) | |
4ef85a9c | 1575 | { |
d06107ad HR |
1576 | return bdrv_mirror_top_do_write(bs, MIRROR_METHOD_DISCARD, offset, bytes, |
1577 | NULL, 0); | |
4ef85a9c KW |
1578 | } |
1579 | ||
998b3a1e | 1580 | static void bdrv_mirror_top_refresh_filename(BlockDriverState *bs) |
fd4a6493 | 1581 | { |
18775ff3 VSO |
1582 | if (bs->backing == NULL) { |
1583 | /* we can be here after failed bdrv_attach_child in | |
1584 | * bdrv_set_backing_hd */ | |
1585 | return; | |
1586 | } | |
fd4a6493 KW |
1587 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), |
1588 | bs->backing->bs->filename); | |
1589 | } | |
1590 | ||
4ef85a9c | 1591 | static void bdrv_mirror_top_child_perm(BlockDriverState *bs, BdrvChild *c, |
bf8e925e | 1592 | BdrvChildRole role, |
e0995dc3 | 1593 | BlockReopenQueue *reopen_queue, |
4ef85a9c KW |
1594 | uint64_t perm, uint64_t shared, |
1595 | uint64_t *nperm, uint64_t *nshared) | |
1596 | { | |
f94dc3b4 HR |
1597 | MirrorBDSOpaque *s = bs->opaque; |
1598 | ||
1599 | if (s->stop) { | |
1600 | /* | |
1601 | * If the job is to be stopped, we do not need to forward | |
1602 | * anything to the real image. | |
1603 | */ | |
1604 | *nperm = 0; | |
1605 | *nshared = BLK_PERM_ALL; | |
1606 | return; | |
1607 | } | |
1608 | ||
53431b90 HR |
1609 | bdrv_default_perms(bs, c, role, reopen_queue, |
1610 | perm, shared, nperm, nshared); | |
4ef85a9c | 1611 | |
53431b90 HR |
1612 | if (s->is_commit) { |
1613 | /* | |
1614 | * For commit jobs, we cannot take CONSISTENT_READ, because | |
1615 | * that permission is unshared for everything above the base | |
1616 | * node (except for filters on the base node). | |
1617 | * We also have to force-share the WRITE permission, or | |
1618 | * otherwise we would block ourselves at the base node (if | |
1619 | * writes are blocked for a node, they are also blocked for | |
1620 | * its backing file). | |
1621 | * (We could also share RESIZE, because it may be needed for | |
1622 | * the target if its size is less than the top node's; but | |
1623 | * bdrv_default_perms_for_cow() automatically shares RESIZE | |
1624 | * for backing nodes if WRITE is shared, so there is no need | |
1625 | * to do it here.) | |
1626 | */ | |
1627 | *nperm &= ~BLK_PERM_CONSISTENT_READ; | |
1628 | *nshared |= BLK_PERM_WRITE; | |
1629 | } | |
4ef85a9c KW |
1630 | } |
1631 | ||
1632 | /* Dummy node that provides consistent read to its users without requiring it | |
1633 | * from its backing file and that allows writes on the backing file chain. */ | |
1634 | static BlockDriver bdrv_mirror_top = { | |
1635 | .format_name = "mirror_top", | |
1636 | .bdrv_co_preadv = bdrv_mirror_top_preadv, | |
1637 | .bdrv_co_pwritev = bdrv_mirror_top_pwritev, | |
1638 | .bdrv_co_pwrite_zeroes = bdrv_mirror_top_pwrite_zeroes, | |
1639 | .bdrv_co_pdiscard = bdrv_mirror_top_pdiscard, | |
1640 | .bdrv_co_flush = bdrv_mirror_top_flush, | |
fd4a6493 | 1641 | .bdrv_refresh_filename = bdrv_mirror_top_refresh_filename, |
4ef85a9c | 1642 | .bdrv_child_perm = bdrv_mirror_top_child_perm, |
6540fd15 HR |
1643 | |
1644 | .is_filter = true, | |
046fd84f | 1645 | .filtered_child_is_backing = true, |
4ef85a9c KW |
1646 | }; |
1647 | ||
cc19f177 VSO |
1648 | static BlockJob *mirror_start_job( |
1649 | const char *job_id, BlockDriverState *bs, | |
47970dfb JS |
1650 | int creation_flags, BlockDriverState *target, |
1651 | const char *replaces, int64_t speed, | |
1652 | uint32_t granularity, int64_t buf_size, | |
274fccee | 1653 | BlockMirrorBackingMode backing_mode, |
cdf3bc93 | 1654 | bool zero_target, |
09158f00 BC |
1655 | BlockdevOnError on_source_error, |
1656 | BlockdevOnError on_target_error, | |
0fc9f8ea | 1657 | bool unmap, |
097310b5 | 1658 | BlockCompletionFunc *cb, |
51ccfa2d | 1659 | void *opaque, |
09158f00 | 1660 | const BlockJobDriver *driver, |
b49f7ead | 1661 | bool is_none_mode, BlockDriverState *base, |
51ccfa2d | 1662 | bool auto_complete, const char *filter_node_name, |
481debaa | 1663 | bool is_mirror, MirrorCopyMode copy_mode, |
51ccfa2d | 1664 | Error **errp) |
893f7eba PB |
1665 | { |
1666 | MirrorBlockJob *s; | |
429076e8 | 1667 | MirrorBDSOpaque *bs_opaque; |
4ef85a9c | 1668 | BlockDriverState *mirror_top_bs; |
4ef85a9c | 1669 | bool target_is_backing; |
3f072a7f | 1670 | uint64_t target_perms, target_shared_perms; |
d7086422 | 1671 | int ret; |
893f7eba | 1672 | |
eee13dfe | 1673 | if (granularity == 0) { |
341ebc2f | 1674 | granularity = bdrv_get_default_bitmap_granularity(target); |
eee13dfe PB |
1675 | } |
1676 | ||
31826642 | 1677 | assert(is_power_of_2(granularity)); |
eee13dfe | 1678 | |
48ac0a4d WC |
1679 | if (buf_size < 0) { |
1680 | error_setg(errp, "Invalid parameter 'buf-size'"); | |
cc19f177 | 1681 | return NULL; |
48ac0a4d WC |
1682 | } |
1683 | ||
1684 | if (buf_size == 0) { | |
1685 | buf_size = DEFAULT_MIRROR_BUF_SIZE; | |
1686 | } | |
5bc361b8 | 1687 | |
3f072a7f | 1688 | if (bdrv_skip_filters(bs) == bdrv_skip_filters(target)) { |
86fae10c | 1689 | error_setg(errp, "Can't mirror node into itself"); |
cc19f177 | 1690 | return NULL; |
86fae10c KW |
1691 | } |
1692 | ||
53431b90 HR |
1693 | target_is_backing = bdrv_chain_contains(bs, target); |
1694 | ||
4ef85a9c KW |
1695 | /* In the case of active commit, add dummy driver to provide consistent |
1696 | * reads on the top, while disabling it in the intermediate nodes, and make | |
1697 | * the backing chain writable. */ | |
6cdbceb1 KW |
1698 | mirror_top_bs = bdrv_new_open_driver(&bdrv_mirror_top, filter_node_name, |
1699 | BDRV_O_RDWR, errp); | |
4ef85a9c | 1700 | if (mirror_top_bs == NULL) { |
cc19f177 | 1701 | return NULL; |
4ef85a9c | 1702 | } |
d3c8c674 KW |
1703 | if (!filter_node_name) { |
1704 | mirror_top_bs->implicit = true; | |
1705 | } | |
e5182c1c HR |
1706 | |
1707 | /* So that we can always drop this node */ | |
1708 | mirror_top_bs->never_freeze = true; | |
1709 | ||
4ef85a9c | 1710 | mirror_top_bs->total_sectors = bs->total_sectors; |
228345bf | 1711 | mirror_top_bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED; |
80f5c33f KW |
1712 | mirror_top_bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | |
1713 | BDRV_REQ_NO_FALLBACK; | |
429076e8 HR |
1714 | bs_opaque = g_new0(MirrorBDSOpaque, 1); |
1715 | mirror_top_bs->opaque = bs_opaque; | |
4ef85a9c | 1716 | |
53431b90 HR |
1717 | bs_opaque->is_commit = target_is_backing; |
1718 | ||
4ef85a9c | 1719 | bdrv_drained_begin(bs); |
934aee14 | 1720 | ret = bdrv_append(mirror_top_bs, bs, errp); |
4ef85a9c KW |
1721 | bdrv_drained_end(bs); |
1722 | ||
934aee14 | 1723 | if (ret < 0) { |
b2c2832c | 1724 | bdrv_unref(mirror_top_bs); |
cc19f177 | 1725 | return NULL; |
b2c2832c KW |
1726 | } |
1727 | ||
4ef85a9c | 1728 | /* Make sure that the source is not resized while the job is running */ |
75859b94 | 1729 | s = block_job_create(job_id, driver, NULL, mirror_top_bs, |
4ef85a9c KW |
1730 | BLK_PERM_CONSISTENT_READ, |
1731 | BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED | | |
64631f36 | 1732 | BLK_PERM_WRITE, speed, |
c6cc12bf | 1733 | creation_flags, cb, opaque, errp); |
893f7eba | 1734 | if (!s) { |
4ef85a9c | 1735 | goto fail; |
893f7eba | 1736 | } |
429076e8 | 1737 | |
7a25fcd0 HR |
1738 | /* The block job now has a reference to this node */ |
1739 | bdrv_unref(mirror_top_bs); | |
1740 | ||
4ef85a9c KW |
1741 | s->mirror_top_bs = mirror_top_bs; |
1742 | ||
1743 | /* No resize for the target either; while the mirror is still running, a | |
1744 | * consistent read isn't necessarily possible. We could possibly allow | |
1745 | * writes and graph modifications, though it would likely defeat the | |
1746 | * purpose of a mirror, so leave them blocked for now. | |
1747 | * | |
1748 | * In the case of active commit, things look a bit different, though, | |
1749 | * because the target is an already populated backing file in active use. | |
1750 | * We can allow anything except resize there.*/ | |
3f072a7f HR |
1751 | |
1752 | target_perms = BLK_PERM_WRITE; | |
1753 | target_shared_perms = BLK_PERM_WRITE_UNCHANGED; | |
1754 | ||
3f072a7f HR |
1755 | if (target_is_backing) { |
1756 | int64_t bs_size, target_size; | |
1757 | bs_size = bdrv_getlength(bs); | |
1758 | if (bs_size < 0) { | |
1759 | error_setg_errno(errp, -bs_size, | |
1760 | "Could not inquire top image size"); | |
1761 | goto fail; | |
1762 | } | |
1763 | ||
1764 | target_size = bdrv_getlength(target); | |
1765 | if (target_size < 0) { | |
1766 | error_setg_errno(errp, -target_size, | |
1767 | "Could not inquire base image size"); | |
1768 | goto fail; | |
1769 | } | |
1770 | ||
1771 | if (target_size < bs_size) { | |
1772 | target_perms |= BLK_PERM_RESIZE; | |
1773 | } | |
1774 | ||
64631f36 | 1775 | target_shared_perms |= BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE; |
3f072a7f HR |
1776 | } else if (bdrv_chain_contains(bs, bdrv_skip_filters(target))) { |
1777 | /* | |
1778 | * We may want to allow this in the future, but it would | |
1779 | * require taking some extra care. | |
1780 | */ | |
1781 | error_setg(errp, "Cannot mirror to a filter on top of a node in the " | |
1782 | "source's backing chain"); | |
1783 | goto fail; | |
1784 | } | |
1785 | ||
d861ab3a | 1786 | s->target = blk_new(s->common.job.aio_context, |
3f072a7f | 1787 | target_perms, target_shared_perms); |
d7086422 KW |
1788 | ret = blk_insert_bs(s->target, target, errp); |
1789 | if (ret < 0) { | |
4ef85a9c | 1790 | goto fail; |
d7086422 | 1791 | } |
045a2f82 FZ |
1792 | if (is_mirror) { |
1793 | /* XXX: Mirror target could be a NBD server of target QEMU in the case | |
1794 | * of non-shared block migration. To allow migration completion, we | |
1795 | * have to allow "inactivate" of the target BB. When that happens, we | |
1796 | * know the job is drained, and the vcpus are stopped, so no write | |
1797 | * operation will be performed. Block layer already has assertions to | |
1798 | * ensure that. */ | |
1799 | blk_set_force_allow_inactivate(s->target); | |
1800 | } | |
9ff7f0df | 1801 | blk_set_allow_aio_context_change(s->target, true); |
cf312932 | 1802 | blk_set_disable_request_queuing(s->target, true); |
e253f4b8 | 1803 | |
09158f00 | 1804 | s->replaces = g_strdup(replaces); |
b952b558 PB |
1805 | s->on_source_error = on_source_error; |
1806 | s->on_target_error = on_target_error; | |
03544a6e | 1807 | s->is_none_mode = is_none_mode; |
274fccee | 1808 | s->backing_mode = backing_mode; |
cdf3bc93 | 1809 | s->zero_target = zero_target; |
481debaa | 1810 | s->copy_mode = copy_mode; |
5bc361b8 | 1811 | s->base = base; |
3f072a7f | 1812 | s->base_overlay = bdrv_find_overlay(bs, base); |
eee13dfe | 1813 | s->granularity = granularity; |
48ac0a4d | 1814 | s->buf_size = ROUND_UP(buf_size, granularity); |
0fc9f8ea | 1815 | s->unmap = unmap; |
b49f7ead WC |
1816 | if (auto_complete) { |
1817 | s->should_complete = true; | |
1818 | } | |
b812f671 | 1819 | |
0db6e54a | 1820 | s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); |
b8afb520 | 1821 | if (!s->dirty_bitmap) { |
88f9d1b3 | 1822 | goto fail; |
b8afb520 | 1823 | } |
dbdf699c VSO |
1824 | if (s->copy_mode == MIRROR_COPY_MODE_WRITE_BLOCKING) { |
1825 | bdrv_disable_dirty_bitmap(s->dirty_bitmap); | |
1826 | } | |
10f3cd15 | 1827 | |
67b24427 AG |
1828 | ret = block_job_add_bdrv(&s->common, "source", bs, 0, |
1829 | BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE | | |
1830 | BLK_PERM_CONSISTENT_READ, | |
1831 | errp); | |
1832 | if (ret < 0) { | |
1833 | goto fail; | |
1834 | } | |
1835 | ||
4ef85a9c | 1836 | /* Required permissions are already taken with blk_new() */ |
76d554e2 KW |
1837 | block_job_add_bdrv(&s->common, "target", target, 0, BLK_PERM_ALL, |
1838 | &error_abort); | |
1839 | ||
f3ede4b0 AG |
1840 | /* In commit_active_start() all intermediate nodes disappear, so |
1841 | * any jobs in them must be blocked */ | |
4ef85a9c | 1842 | if (target_is_backing) { |
3f072a7f HR |
1843 | BlockDriverState *iter, *filtered_target; |
1844 | uint64_t iter_shared_perms; | |
1845 | ||
1846 | /* | |
1847 | * The topmost node with | |
1848 | * bdrv_skip_filters(filtered_target) == bdrv_skip_filters(target) | |
1849 | */ | |
1850 | filtered_target = bdrv_cow_bs(bdrv_find_overlay(bs, target)); | |
1851 | ||
1852 | assert(bdrv_skip_filters(filtered_target) == | |
1853 | bdrv_skip_filters(target)); | |
1854 | ||
1855 | /* | |
1856 | * XXX BLK_PERM_WRITE needs to be allowed so we don't block | |
1857 | * ourselves at s->base (if writes are blocked for a node, they are | |
1858 | * also blocked for its backing file). The other options would be a | |
1859 | * second filter driver above s->base (== target). | |
1860 | */ | |
1861 | iter_shared_perms = BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE; | |
1862 | ||
1863 | for (iter = bdrv_filter_or_cow_bs(bs); iter != target; | |
1864 | iter = bdrv_filter_or_cow_bs(iter)) | |
1865 | { | |
1866 | if (iter == filtered_target) { | |
1867 | /* | |
1868 | * From here on, all nodes are filters on the base. | |
1869 | * This allows us to share BLK_PERM_CONSISTENT_READ. | |
1870 | */ | |
1871 | iter_shared_perms |= BLK_PERM_CONSISTENT_READ; | |
1872 | } | |
1873 | ||
4ef85a9c | 1874 | ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0, |
3f072a7f | 1875 | iter_shared_perms, errp); |
4ef85a9c KW |
1876 | if (ret < 0) { |
1877 | goto fail; | |
1878 | } | |
f3ede4b0 | 1879 | } |
ef53dc09 AG |
1880 | |
1881 | if (bdrv_freeze_backing_chain(mirror_top_bs, target, errp) < 0) { | |
1882 | goto fail; | |
1883 | } | |
f3ede4b0 | 1884 | } |
10f3cd15 | 1885 | |
12aa4082 HR |
1886 | QTAILQ_INIT(&s->ops_in_flight); |
1887 | ||
5ccac6f1 | 1888 | trace_mirror_start(bs, s, opaque); |
da01ff7f | 1889 | job_start(&s->common.job); |
cc19f177 VSO |
1890 | |
1891 | return &s->common; | |
4ef85a9c KW |
1892 | |
1893 | fail: | |
1894 | if (s) { | |
7a25fcd0 HR |
1895 | /* Make sure this BDS does not go away until we have completed the graph |
1896 | * changes below */ | |
1897 | bdrv_ref(mirror_top_bs); | |
1898 | ||
4ef85a9c KW |
1899 | g_free(s->replaces); |
1900 | blk_unref(s->target); | |
429076e8 | 1901 | bs_opaque->job = NULL; |
e917e2cb | 1902 | if (s->dirty_bitmap) { |
5deb6cbd | 1903 | bdrv_release_dirty_bitmap(s->dirty_bitmap); |
e917e2cb | 1904 | } |
4ad35181 | 1905 | job_early_fail(&s->common.job); |
4ef85a9c KW |
1906 | } |
1907 | ||
f94dc3b4 HR |
1908 | bs_opaque->stop = true; |
1909 | bdrv_child_refresh_perms(mirror_top_bs, mirror_top_bs->backing, | |
1910 | &error_abort); | |
3f072a7f | 1911 | bdrv_replace_node(mirror_top_bs, mirror_top_bs->backing->bs, &error_abort); |
7a25fcd0 HR |
1912 | |
1913 | bdrv_unref(mirror_top_bs); | |
cc19f177 VSO |
1914 | |
1915 | return NULL; | |
893f7eba | 1916 | } |
03544a6e | 1917 | |
71aa9867 AG |
1918 | void mirror_start(const char *job_id, BlockDriverState *bs, |
1919 | BlockDriverState *target, const char *replaces, | |
a1999b33 JS |
1920 | int creation_flags, int64_t speed, |
1921 | uint32_t granularity, int64_t buf_size, | |
274fccee | 1922 | MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, |
cdf3bc93 | 1923 | bool zero_target, |
274fccee | 1924 | BlockdevOnError on_source_error, |
03544a6e | 1925 | BlockdevOnError on_target_error, |
481debaa HR |
1926 | bool unmap, const char *filter_node_name, |
1927 | MirrorCopyMode copy_mode, Error **errp) | |
03544a6e FZ |
1928 | { |
1929 | bool is_none_mode; | |
1930 | BlockDriverState *base; | |
1931 | ||
b4ad82aa EGE |
1932 | GLOBAL_STATE_CODE(); |
1933 | ||
c8b56501 JS |
1934 | if ((mode == MIRROR_SYNC_MODE_INCREMENTAL) || |
1935 | (mode == MIRROR_SYNC_MODE_BITMAP)) { | |
1936 | error_setg(errp, "Sync mode '%s' not supported", | |
1937 | MirrorSyncMode_str(mode)); | |
d58d8453 JS |
1938 | return; |
1939 | } | |
03544a6e | 1940 | is_none_mode = mode == MIRROR_SYNC_MODE_NONE; |
3f072a7f | 1941 | base = mode == MIRROR_SYNC_MODE_TOP ? bdrv_backing_chain_next(bs) : NULL; |
a1999b33 | 1942 | mirror_start_job(job_id, bs, creation_flags, target, replaces, |
cdf3bc93 | 1943 | speed, granularity, buf_size, backing_mode, zero_target, |
51ccfa2d | 1944 | on_source_error, on_target_error, unmap, NULL, NULL, |
6cdbceb1 | 1945 | &mirror_job_driver, is_none_mode, base, false, |
481debaa | 1946 | filter_node_name, true, copy_mode, errp); |
03544a6e FZ |
1947 | } |
1948 | ||
cc19f177 VSO |
1949 | BlockJob *commit_active_start(const char *job_id, BlockDriverState *bs, |
1950 | BlockDriverState *base, int creation_flags, | |
1951 | int64_t speed, BlockdevOnError on_error, | |
1952 | const char *filter_node_name, | |
1953 | BlockCompletionFunc *cb, void *opaque, | |
1954 | bool auto_complete, Error **errp) | |
03544a6e | 1955 | { |
1ba79388 | 1956 | bool base_read_only; |
eb5becc1 | 1957 | BlockJob *job; |
4da83585 | 1958 | |
b4ad82aa EGE |
1959 | GLOBAL_STATE_CODE(); |
1960 | ||
1ba79388 | 1961 | base_read_only = bdrv_is_read_only(base); |
4da83585 | 1962 | |
1ba79388 AG |
1963 | if (base_read_only) { |
1964 | if (bdrv_reopen_set_read_only(base, false, errp) < 0) { | |
cc19f177 | 1965 | return NULL; |
1ba79388 | 1966 | } |
20a63d2c | 1967 | } |
4da83585 | 1968 | |
eb5becc1 | 1969 | job = mirror_start_job( |
cc19f177 | 1970 | job_id, bs, creation_flags, base, NULL, speed, 0, 0, |
cdf3bc93 | 1971 | MIRROR_LEAVE_BACKING_CHAIN, false, |
51ccfa2d | 1972 | on_error, on_error, true, cb, opaque, |
6cdbceb1 | 1973 | &commit_active_job_driver, false, base, auto_complete, |
481debaa | 1974 | filter_node_name, false, MIRROR_COPY_MODE_BACKGROUND, |
eb5becc1 VSO |
1975 | errp); |
1976 | if (!job) { | |
4da83585 JC |
1977 | goto error_restore_flags; |
1978 | } | |
1979 | ||
eb5becc1 | 1980 | return job; |
4da83585 JC |
1981 | |
1982 | error_restore_flags: | |
1983 | /* ignore error and errp for bdrv_reopen, because we want to propagate | |
1984 | * the original error */ | |
1ba79388 AG |
1985 | if (base_read_only) { |
1986 | bdrv_reopen_set_read_only(base, true, NULL); | |
1987 | } | |
cc19f177 | 1988 | return NULL; |
03544a6e | 1989 | } |