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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" |
893f7eba | 16 | #include "trace.h" |
c87621ea | 17 | #include "block/blockjob_int.h" |
737e150e | 18 | #include "block/block_int.h" |
373340b2 | 19 | #include "sysemu/block-backend.h" |
da34e65c | 20 | #include "qapi/error.h" |
cc7a8ea7 | 21 | #include "qapi/qmp/qerror.h" |
893f7eba | 22 | #include "qemu/ratelimit.h" |
b812f671 | 23 | #include "qemu/bitmap.h" |
893f7eba | 24 | |
402a4741 PB |
25 | #define SLICE_TIME 100000000ULL /* ns */ |
26 | #define MAX_IN_FLIGHT 16 | |
0965a41e VSO |
27 | #define MAX_IO_SECTORS ((1 << 20) >> BDRV_SECTOR_BITS) /* 1 Mb */ |
28 | #define DEFAULT_MIRROR_BUF_SIZE \ | |
29 | (MAX_IN_FLIGHT * MAX_IO_SECTORS * BDRV_SECTOR_SIZE) | |
402a4741 PB |
30 | |
31 | /* The mirroring buffer is a list of granularity-sized chunks. | |
32 | * Free chunks are organized in a list. | |
33 | */ | |
34 | typedef struct MirrorBuffer { | |
35 | QSIMPLEQ_ENTRY(MirrorBuffer) next; | |
36 | } MirrorBuffer; | |
893f7eba PB |
37 | |
38 | typedef struct MirrorBlockJob { | |
39 | BlockJob common; | |
40 | RateLimit limit; | |
e253f4b8 | 41 | BlockBackend *target; |
4ef85a9c KW |
42 | BlockDriverState *mirror_top_bs; |
43 | BlockDriverState *source; | |
5bc361b8 | 44 | BlockDriverState *base; |
4ef85a9c | 45 | |
09158f00 BC |
46 | /* The name of the graph node to replace */ |
47 | char *replaces; | |
48 | /* The BDS to replace */ | |
49 | BlockDriverState *to_replace; | |
50 | /* Used to block operations on the drive-mirror-replace target */ | |
51 | Error *replace_blocker; | |
03544a6e | 52 | bool is_none_mode; |
274fccee | 53 | BlockMirrorBackingMode backing_mode; |
b952b558 | 54 | BlockdevOnError on_source_error, on_target_error; |
d63ffd87 PB |
55 | bool synced; |
56 | bool should_complete; | |
eee13dfe | 57 | int64_t granularity; |
b812f671 | 58 | size_t buf_size; |
b21c7652 | 59 | int64_t bdev_length; |
b812f671 | 60 | unsigned long *cow_bitmap; |
e4654d2d | 61 | BdrvDirtyBitmap *dirty_bitmap; |
dc162c8e | 62 | BdrvDirtyBitmapIter *dbi; |
893f7eba | 63 | uint8_t *buf; |
402a4741 PB |
64 | QSIMPLEQ_HEAD(, MirrorBuffer) buf_free; |
65 | int buf_free_count; | |
bd48bde8 | 66 | |
49efb1f5 | 67 | uint64_t last_pause_ns; |
402a4741 | 68 | unsigned long *in_flight_bitmap; |
bd48bde8 | 69 | int in_flight; |
531509ba | 70 | int64_t sectors_in_flight; |
bd48bde8 | 71 | int ret; |
0fc9f8ea | 72 | bool unmap; |
e424aff5 | 73 | bool waiting_for_io; |
e5b43573 FZ |
74 | int target_cluster_sectors; |
75 | int max_iov; | |
90ab48eb | 76 | bool initial_zeroing_ongoing; |
893f7eba PB |
77 | } MirrorBlockJob; |
78 | ||
bd48bde8 PB |
79 | typedef struct MirrorOp { |
80 | MirrorBlockJob *s; | |
81 | QEMUIOVector qiov; | |
bd48bde8 PB |
82 | int64_t sector_num; |
83 | int nb_sectors; | |
84 | } MirrorOp; | |
85 | ||
b952b558 PB |
86 | static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read, |
87 | int error) | |
88 | { | |
89 | s->synced = false; | |
90 | if (read) { | |
81e254dc KW |
91 | return block_job_error_action(&s->common, s->on_source_error, |
92 | true, error); | |
b952b558 | 93 | } else { |
81e254dc KW |
94 | return block_job_error_action(&s->common, s->on_target_error, |
95 | false, error); | |
b952b558 PB |
96 | } |
97 | } | |
98 | ||
bd48bde8 PB |
99 | static void mirror_iteration_done(MirrorOp *op, int ret) |
100 | { | |
101 | MirrorBlockJob *s = op->s; | |
402a4741 | 102 | struct iovec *iov; |
bd48bde8 | 103 | int64_t chunk_num; |
402a4741 | 104 | int i, nb_chunks, sectors_per_chunk; |
bd48bde8 PB |
105 | |
106 | trace_mirror_iteration_done(s, op->sector_num, op->nb_sectors, ret); | |
107 | ||
108 | s->in_flight--; | |
b21c7652 | 109 | s->sectors_in_flight -= op->nb_sectors; |
402a4741 PB |
110 | iov = op->qiov.iov; |
111 | for (i = 0; i < op->qiov.niov; i++) { | |
112 | MirrorBuffer *buf = (MirrorBuffer *) iov[i].iov_base; | |
113 | QSIMPLEQ_INSERT_TAIL(&s->buf_free, buf, next); | |
114 | s->buf_free_count++; | |
115 | } | |
116 | ||
bd48bde8 PB |
117 | sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; |
118 | chunk_num = op->sector_num / sectors_per_chunk; | |
4150ae60 | 119 | nb_chunks = DIV_ROUND_UP(op->nb_sectors, sectors_per_chunk); |
402a4741 | 120 | bitmap_clear(s->in_flight_bitmap, chunk_num, nb_chunks); |
b21c7652 HR |
121 | if (ret >= 0) { |
122 | if (s->cow_bitmap) { | |
123 | bitmap_set(s->cow_bitmap, chunk_num, nb_chunks); | |
124 | } | |
90ab48eb AN |
125 | if (!s->initial_zeroing_ongoing) { |
126 | s->common.offset += (uint64_t)op->nb_sectors * BDRV_SECTOR_SIZE; | |
127 | } | |
bd48bde8 | 128 | } |
6df3bf8e | 129 | qemu_iovec_destroy(&op->qiov); |
c84b3192 | 130 | g_free(op); |
7b770c72 | 131 | |
e424aff5 | 132 | if (s->waiting_for_io) { |
0b8b8753 | 133 | qemu_coroutine_enter(s->common.co); |
7b770c72 | 134 | } |
bd48bde8 PB |
135 | } |
136 | ||
137 | static void mirror_write_complete(void *opaque, int ret) | |
138 | { | |
139 | MirrorOp *op = opaque; | |
140 | MirrorBlockJob *s = op->s; | |
b9e413dd PB |
141 | |
142 | aio_context_acquire(blk_get_aio_context(s->common.blk)); | |
bd48bde8 | 143 | if (ret < 0) { |
bd48bde8 PB |
144 | BlockErrorAction action; |
145 | ||
20dca810 | 146 | bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors); |
bd48bde8 | 147 | action = mirror_error_action(s, false, -ret); |
a589569f | 148 | if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { |
bd48bde8 PB |
149 | s->ret = ret; |
150 | } | |
151 | } | |
152 | mirror_iteration_done(op, ret); | |
b9e413dd | 153 | aio_context_release(blk_get_aio_context(s->common.blk)); |
bd48bde8 PB |
154 | } |
155 | ||
156 | static void mirror_read_complete(void *opaque, int ret) | |
157 | { | |
158 | MirrorOp *op = opaque; | |
159 | MirrorBlockJob *s = op->s; | |
b9e413dd PB |
160 | |
161 | aio_context_acquire(blk_get_aio_context(s->common.blk)); | |
bd48bde8 | 162 | if (ret < 0) { |
bd48bde8 PB |
163 | BlockErrorAction action; |
164 | ||
20dca810 | 165 | bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors); |
bd48bde8 | 166 | action = mirror_error_action(s, true, -ret); |
a589569f | 167 | if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { |
bd48bde8 PB |
168 | s->ret = ret; |
169 | } | |
170 | ||
171 | mirror_iteration_done(op, ret); | |
b9e413dd PB |
172 | } else { |
173 | blk_aio_pwritev(s->target, op->sector_num * BDRV_SECTOR_SIZE, &op->qiov, | |
174 | 0, mirror_write_complete, op); | |
bd48bde8 | 175 | } |
b9e413dd | 176 | aio_context_release(blk_get_aio_context(s->common.blk)); |
bd48bde8 PB |
177 | } |
178 | ||
4150ae60 FZ |
179 | static inline void mirror_clip_sectors(MirrorBlockJob *s, |
180 | int64_t sector_num, | |
181 | int *nb_sectors) | |
182 | { | |
183 | *nb_sectors = MIN(*nb_sectors, | |
184 | s->bdev_length / BDRV_SECTOR_SIZE - sector_num); | |
185 | } | |
186 | ||
e5b43573 FZ |
187 | /* Round sector_num and/or nb_sectors to target cluster if COW is needed, and |
188 | * return the offset of the adjusted tail sector against original. */ | |
189 | static int mirror_cow_align(MirrorBlockJob *s, | |
190 | int64_t *sector_num, | |
191 | int *nb_sectors) | |
893f7eba | 192 | { |
e5b43573 FZ |
193 | bool need_cow; |
194 | int ret = 0; | |
195 | int chunk_sectors = s->granularity >> BDRV_SECTOR_BITS; | |
196 | int64_t align_sector_num = *sector_num; | |
197 | int align_nb_sectors = *nb_sectors; | |
198 | int max_sectors = chunk_sectors * s->max_iov; | |
199 | ||
200 | need_cow = !test_bit(*sector_num / chunk_sectors, s->cow_bitmap); | |
201 | need_cow |= !test_bit((*sector_num + *nb_sectors - 1) / chunk_sectors, | |
202 | s->cow_bitmap); | |
203 | if (need_cow) { | |
244483e6 KW |
204 | bdrv_round_sectors_to_clusters(blk_bs(s->target), *sector_num, |
205 | *nb_sectors, &align_sector_num, | |
206 | &align_nb_sectors); | |
e5b43573 | 207 | } |
3515727f | 208 | |
e5b43573 FZ |
209 | if (align_nb_sectors > max_sectors) { |
210 | align_nb_sectors = max_sectors; | |
211 | if (need_cow) { | |
212 | align_nb_sectors = QEMU_ALIGN_DOWN(align_nb_sectors, | |
213 | s->target_cluster_sectors); | |
214 | } | |
8f0720ec | 215 | } |
4150ae60 FZ |
216 | /* Clipping may result in align_nb_sectors unaligned to chunk boundary, but |
217 | * that doesn't matter because it's already the end of source image. */ | |
218 | mirror_clip_sectors(s, align_sector_num, &align_nb_sectors); | |
8f0720ec | 219 | |
e5b43573 FZ |
220 | ret = align_sector_num + align_nb_sectors - (*sector_num + *nb_sectors); |
221 | *sector_num = align_sector_num; | |
222 | *nb_sectors = align_nb_sectors; | |
223 | assert(ret >= 0); | |
224 | return ret; | |
225 | } | |
226 | ||
21cd917f FZ |
227 | static inline void mirror_wait_for_io(MirrorBlockJob *s) |
228 | { | |
229 | assert(!s->waiting_for_io); | |
230 | s->waiting_for_io = true; | |
231 | qemu_coroutine_yield(); | |
232 | s->waiting_for_io = false; | |
233 | } | |
234 | ||
e5b43573 | 235 | /* Submit async read while handling COW. |
17612955 JS |
236 | * Returns: The number of sectors copied after and including sector_num, |
237 | * excluding any sectors copied prior to sector_num due to alignment. | |
238 | * This will be nb_sectors if no alignment is necessary, or | |
e5b43573 FZ |
239 | * (new_end - sector_num) if tail is rounded up or down due to |
240 | * alignment or buffer limit. | |
241 | */ | |
242 | static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num, | |
243 | int nb_sectors) | |
244 | { | |
e253f4b8 | 245 | BlockBackend *source = s->common.blk; |
e5b43573 | 246 | int sectors_per_chunk, nb_chunks; |
17612955 | 247 | int ret; |
e5b43573 | 248 | MirrorOp *op; |
e4808881 | 249 | int max_sectors; |
e5b43573 | 250 | |
884fea4e | 251 | sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; |
e4808881 | 252 | max_sectors = sectors_per_chunk * s->max_iov; |
402a4741 | 253 | |
e5b43573 FZ |
254 | /* We can only handle as much as buf_size at a time. */ |
255 | nb_sectors = MIN(s->buf_size >> BDRV_SECTOR_BITS, nb_sectors); | |
e4808881 | 256 | nb_sectors = MIN(max_sectors, nb_sectors); |
e5b43573 | 257 | assert(nb_sectors); |
17612955 | 258 | ret = nb_sectors; |
402a4741 | 259 | |
e5b43573 FZ |
260 | if (s->cow_bitmap) { |
261 | ret += mirror_cow_align(s, §or_num, &nb_sectors); | |
262 | } | |
263 | assert(nb_sectors << BDRV_SECTOR_BITS <= s->buf_size); | |
264 | /* The sector range must meet granularity because: | |
265 | * 1) Caller passes in aligned values; | |
266 | * 2) mirror_cow_align is used only when target cluster is larger. */ | |
e5b43573 | 267 | assert(!(sector_num % sectors_per_chunk)); |
4150ae60 | 268 | nb_chunks = DIV_ROUND_UP(nb_sectors, sectors_per_chunk); |
e5b43573 FZ |
269 | |
270 | while (s->buf_free_count < nb_chunks) { | |
402a4741 | 271 | trace_mirror_yield_in_flight(s, sector_num, s->in_flight); |
21cd917f | 272 | mirror_wait_for_io(s); |
b812f671 PB |
273 | } |
274 | ||
bd48bde8 | 275 | /* Allocate a MirrorOp that is used as an AIO callback. */ |
c84b3192 | 276 | op = g_new(MirrorOp, 1); |
bd48bde8 | 277 | op->s = s; |
bd48bde8 PB |
278 | op->sector_num = sector_num; |
279 | op->nb_sectors = nb_sectors; | |
402a4741 PB |
280 | |
281 | /* Now make a QEMUIOVector taking enough granularity-sized chunks | |
282 | * from s->buf_free. | |
283 | */ | |
284 | qemu_iovec_init(&op->qiov, nb_chunks); | |
402a4741 PB |
285 | while (nb_chunks-- > 0) { |
286 | MirrorBuffer *buf = QSIMPLEQ_FIRST(&s->buf_free); | |
e5b43573 | 287 | size_t remaining = nb_sectors * BDRV_SECTOR_SIZE - op->qiov.size; |
5a0f6fd5 | 288 | |
402a4741 PB |
289 | QSIMPLEQ_REMOVE_HEAD(&s->buf_free, next); |
290 | s->buf_free_count--; | |
5a0f6fd5 | 291 | qemu_iovec_add(&op->qiov, buf, MIN(s->granularity, remaining)); |
402a4741 | 292 | } |
bd48bde8 | 293 | |
893f7eba | 294 | /* Copy the dirty cluster. */ |
bd48bde8 | 295 | s->in_flight++; |
b21c7652 | 296 | s->sectors_in_flight += nb_sectors; |
b812f671 | 297 | trace_mirror_one_iteration(s, sector_num, nb_sectors); |
dcfb3beb | 298 | |
73698c30 | 299 | blk_aio_preadv(source, sector_num * BDRV_SECTOR_SIZE, &op->qiov, 0, |
e5b43573 FZ |
300 | mirror_read_complete, op); |
301 | return ret; | |
302 | } | |
303 | ||
304 | static void mirror_do_zero_or_discard(MirrorBlockJob *s, | |
305 | int64_t sector_num, | |
306 | int nb_sectors, | |
307 | bool is_discard) | |
308 | { | |
309 | MirrorOp *op; | |
310 | ||
311 | /* Allocate a MirrorOp that is used as an AIO callback. The qiov is zeroed | |
312 | * so the freeing in mirror_iteration_done is nop. */ | |
313 | op = g_new0(MirrorOp, 1); | |
314 | op->s = s; | |
315 | op->sector_num = sector_num; | |
316 | op->nb_sectors = nb_sectors; | |
317 | ||
318 | s->in_flight++; | |
319 | s->sectors_in_flight += nb_sectors; | |
320 | if (is_discard) { | |
1c6c4bb7 EB |
321 | blk_aio_pdiscard(s->target, sector_num << BDRV_SECTOR_BITS, |
322 | op->nb_sectors << BDRV_SECTOR_BITS, | |
323 | mirror_write_complete, op); | |
e5b43573 | 324 | } else { |
e253f4b8 KW |
325 | blk_aio_pwrite_zeroes(s->target, sector_num * BDRV_SECTOR_SIZE, |
326 | op->nb_sectors * BDRV_SECTOR_SIZE, | |
dcfb3beb FZ |
327 | s->unmap ? BDRV_REQ_MAY_UNMAP : 0, |
328 | mirror_write_complete, op); | |
e5b43573 FZ |
329 | } |
330 | } | |
331 | ||
332 | static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) | |
333 | { | |
4ef85a9c | 334 | BlockDriverState *source = s->source; |
9c83625b | 335 | int64_t sector_num, first_chunk; |
e5b43573 FZ |
336 | uint64_t delay_ns = 0; |
337 | /* At least the first dirty chunk is mirrored in one iteration. */ | |
338 | int nb_chunks = 1; | |
339 | int64_t end = s->bdev_length / BDRV_SECTOR_SIZE; | |
340 | int sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; | |
4b5004d9 | 341 | bool write_zeroes_ok = bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)); |
0965a41e VSO |
342 | int max_io_sectors = MAX((s->buf_size >> BDRV_SECTOR_BITS) / MAX_IN_FLIGHT, |
343 | MAX_IO_SECTORS); | |
e5b43573 | 344 | |
b64bd51e | 345 | bdrv_dirty_bitmap_lock(s->dirty_bitmap); |
dc162c8e | 346 | sector_num = bdrv_dirty_iter_next(s->dbi); |
e5b43573 | 347 | if (sector_num < 0) { |
dc162c8e FZ |
348 | bdrv_set_dirty_iter(s->dbi, 0); |
349 | sector_num = bdrv_dirty_iter_next(s->dbi); | |
e5b43573 FZ |
350 | trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap)); |
351 | assert(sector_num >= 0); | |
352 | } | |
b64bd51e | 353 | bdrv_dirty_bitmap_unlock(s->dirty_bitmap); |
e5b43573 | 354 | |
9c83625b HR |
355 | first_chunk = sector_num / sectors_per_chunk; |
356 | while (test_bit(first_chunk, s->in_flight_bitmap)) { | |
ff04198b | 357 | trace_mirror_yield_in_flight(s, sector_num, s->in_flight); |
9c83625b HR |
358 | mirror_wait_for_io(s); |
359 | } | |
360 | ||
565ac01f SH |
361 | block_job_pause_point(&s->common); |
362 | ||
e5b43573 FZ |
363 | /* Find the number of consective dirty chunks following the first dirty |
364 | * one, and wait for in flight requests in them. */ | |
b64bd51e | 365 | bdrv_dirty_bitmap_lock(s->dirty_bitmap); |
e5b43573 | 366 | while (nb_chunks * sectors_per_chunk < (s->buf_size >> BDRV_SECTOR_BITS)) { |
dc162c8e | 367 | int64_t next_dirty; |
e5b43573 FZ |
368 | int64_t next_sector = sector_num + nb_chunks * sectors_per_chunk; |
369 | int64_t next_chunk = next_sector / sectors_per_chunk; | |
370 | if (next_sector >= end || | |
b64bd51e | 371 | !bdrv_get_dirty_locked(source, s->dirty_bitmap, next_sector)) { |
e5b43573 FZ |
372 | break; |
373 | } | |
374 | if (test_bit(next_chunk, s->in_flight_bitmap)) { | |
9c83625b | 375 | break; |
e5b43573 | 376 | } |
9c83625b | 377 | |
dc162c8e FZ |
378 | next_dirty = bdrv_dirty_iter_next(s->dbi); |
379 | if (next_dirty > next_sector || next_dirty < 0) { | |
f27a2742 | 380 | /* The bitmap iterator's cache is stale, refresh it */ |
dc162c8e FZ |
381 | bdrv_set_dirty_iter(s->dbi, next_sector); |
382 | next_dirty = bdrv_dirty_iter_next(s->dbi); | |
f27a2742 | 383 | } |
dc162c8e | 384 | assert(next_dirty == next_sector); |
9c83625b | 385 | nb_chunks++; |
e5b43573 FZ |
386 | } |
387 | ||
388 | /* Clear dirty bits before querying the block status, because | |
389 | * calling bdrv_get_block_status_above could yield - if some blocks are | |
390 | * marked dirty in this window, we need to know. | |
391 | */ | |
b64bd51e PB |
392 | bdrv_reset_dirty_bitmap_locked(s->dirty_bitmap, sector_num, |
393 | nb_chunks * sectors_per_chunk); | |
394 | bdrv_dirty_bitmap_unlock(s->dirty_bitmap); | |
395 | ||
e5b43573 FZ |
396 | bitmap_set(s->in_flight_bitmap, sector_num / sectors_per_chunk, nb_chunks); |
397 | while (nb_chunks > 0 && sector_num < end) { | |
39c11580 | 398 | int64_t ret; |
4b5004d9 | 399 | int io_sectors, io_sectors_acct; |
e5b43573 FZ |
400 | BlockDriverState *file; |
401 | enum MirrorMethod { | |
402 | MIRROR_METHOD_COPY, | |
403 | MIRROR_METHOD_ZERO, | |
404 | MIRROR_METHOD_DISCARD | |
405 | } mirror_method = MIRROR_METHOD_COPY; | |
406 | ||
407 | assert(!(sector_num % sectors_per_chunk)); | |
408 | ret = bdrv_get_block_status_above(source, NULL, sector_num, | |
409 | nb_chunks * sectors_per_chunk, | |
410 | &io_sectors, &file); | |
411 | if (ret < 0) { | |
0965a41e VSO |
412 | io_sectors = MIN(nb_chunks * sectors_per_chunk, max_io_sectors); |
413 | } else if (ret & BDRV_BLOCK_DATA) { | |
414 | io_sectors = MIN(io_sectors, max_io_sectors); | |
e5b43573 FZ |
415 | } |
416 | ||
417 | io_sectors -= io_sectors % sectors_per_chunk; | |
418 | if (io_sectors < sectors_per_chunk) { | |
419 | io_sectors = sectors_per_chunk; | |
420 | } else if (ret >= 0 && !(ret & BDRV_BLOCK_DATA)) { | |
421 | int64_t target_sector_num; | |
422 | int target_nb_sectors; | |
244483e6 KW |
423 | bdrv_round_sectors_to_clusters(blk_bs(s->target), sector_num, |
424 | io_sectors, &target_sector_num, | |
425 | &target_nb_sectors); | |
e5b43573 FZ |
426 | if (target_sector_num == sector_num && |
427 | target_nb_sectors == io_sectors) { | |
428 | mirror_method = ret & BDRV_BLOCK_ZERO ? | |
429 | MIRROR_METHOD_ZERO : | |
430 | MIRROR_METHOD_DISCARD; | |
431 | } | |
432 | } | |
433 | ||
cf56a3c6 DL |
434 | while (s->in_flight >= MAX_IN_FLIGHT) { |
435 | trace_mirror_yield_in_flight(s, sector_num, s->in_flight); | |
436 | mirror_wait_for_io(s); | |
437 | } | |
438 | ||
dbaa7b57 VSO |
439 | if (s->ret < 0) { |
440 | return 0; | |
441 | } | |
442 | ||
4150ae60 | 443 | mirror_clip_sectors(s, sector_num, &io_sectors); |
e5b43573 FZ |
444 | switch (mirror_method) { |
445 | case MIRROR_METHOD_COPY: | |
446 | io_sectors = mirror_do_read(s, sector_num, io_sectors); | |
4b5004d9 | 447 | io_sectors_acct = io_sectors; |
e5b43573 FZ |
448 | break; |
449 | case MIRROR_METHOD_ZERO: | |
e5b43573 | 450 | case MIRROR_METHOD_DISCARD: |
4b5004d9 DL |
451 | mirror_do_zero_or_discard(s, sector_num, io_sectors, |
452 | mirror_method == MIRROR_METHOD_DISCARD); | |
453 | if (write_zeroes_ok) { | |
454 | io_sectors_acct = 0; | |
455 | } else { | |
456 | io_sectors_acct = io_sectors; | |
457 | } | |
e5b43573 FZ |
458 | break; |
459 | default: | |
460 | abort(); | |
461 | } | |
462 | assert(io_sectors); | |
463 | sector_num += io_sectors; | |
4150ae60 | 464 | nb_chunks -= DIV_ROUND_UP(io_sectors, sectors_per_chunk); |
f14a39cc | 465 | if (s->common.speed) { |
4b5004d9 | 466 | delay_ns = ratelimit_calculate_delay(&s->limit, io_sectors_acct); |
f14a39cc | 467 | } |
dcfb3beb | 468 | } |
cc8c9d6c | 469 | return delay_ns; |
bd48bde8 | 470 | } |
b952b558 | 471 | |
402a4741 PB |
472 | static void mirror_free_init(MirrorBlockJob *s) |
473 | { | |
474 | int granularity = s->granularity; | |
475 | size_t buf_size = s->buf_size; | |
476 | uint8_t *buf = s->buf; | |
477 | ||
478 | assert(s->buf_free_count == 0); | |
479 | QSIMPLEQ_INIT(&s->buf_free); | |
480 | while (buf_size != 0) { | |
481 | MirrorBuffer *cur = (MirrorBuffer *)buf; | |
482 | QSIMPLEQ_INSERT_TAIL(&s->buf_free, cur, next); | |
483 | s->buf_free_count++; | |
484 | buf_size -= granularity; | |
485 | buf += granularity; | |
486 | } | |
487 | } | |
488 | ||
bae8196d PB |
489 | /* This is also used for the .pause callback. There is no matching |
490 | * mirror_resume() because mirror_run() will begin iterating again | |
491 | * when the job is resumed. | |
492 | */ | |
493 | static void mirror_wait_for_all_io(MirrorBlockJob *s) | |
bd48bde8 PB |
494 | { |
495 | while (s->in_flight > 0) { | |
21cd917f | 496 | mirror_wait_for_io(s); |
bd48bde8 | 497 | } |
893f7eba PB |
498 | } |
499 | ||
5a7e7a0b SH |
500 | typedef struct { |
501 | int ret; | |
502 | } MirrorExitData; | |
503 | ||
504 | static void mirror_exit(BlockJob *job, void *opaque) | |
505 | { | |
506 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
507 | MirrorExitData *data = opaque; | |
508 | AioContext *replace_aio_context = NULL; | |
4ef85a9c | 509 | BlockDriverState *src = s->source; |
e253f4b8 | 510 | BlockDriverState *target_bs = blk_bs(s->target); |
4ef85a9c | 511 | BlockDriverState *mirror_top_bs = s->mirror_top_bs; |
12fa4af6 | 512 | Error *local_err = NULL; |
3f09bfbc | 513 | |
2119882c PB |
514 | bdrv_release_dirty_bitmap(src, s->dirty_bitmap); |
515 | ||
3f09bfbc KW |
516 | /* Make sure that the source BDS doesn't go away before we called |
517 | * block_job_completed(). */ | |
518 | bdrv_ref(src); | |
4ef85a9c | 519 | bdrv_ref(mirror_top_bs); |
7d9fcb39 KW |
520 | bdrv_ref(target_bs); |
521 | ||
522 | /* Remove target parent that still uses BLK_PERM_WRITE/RESIZE before | |
523 | * inserting target_bs at s->to_replace, where we might not be able to get | |
63c8ef28 KW |
524 | * these permissions. |
525 | * | |
526 | * Note that blk_unref() alone doesn't necessarily drop permissions because | |
527 | * we might be running nested inside mirror_drain(), which takes an extra | |
528 | * reference, so use an explicit blk_set_perm() first. */ | |
529 | blk_set_perm(s->target, 0, BLK_PERM_ALL, &error_abort); | |
7d9fcb39 KW |
530 | blk_unref(s->target); |
531 | s->target = NULL; | |
4ef85a9c KW |
532 | |
533 | /* We don't access the source any more. Dropping any WRITE/RESIZE is | |
534 | * required before it could become a backing file of target_bs. */ | |
535 | bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL, | |
536 | &error_abort); | |
537 | if (s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) { | |
538 | BlockDriverState *backing = s->is_none_mode ? src : s->base; | |
539 | if (backing_bs(target_bs) != backing) { | |
12fa4af6 KW |
540 | bdrv_set_backing_hd(target_bs, backing, &local_err); |
541 | if (local_err) { | |
542 | error_report_err(local_err); | |
543 | data->ret = -EPERM; | |
544 | } | |
4ef85a9c KW |
545 | } |
546 | } | |
5a7e7a0b SH |
547 | |
548 | if (s->to_replace) { | |
549 | replace_aio_context = bdrv_get_aio_context(s->to_replace); | |
550 | aio_context_acquire(replace_aio_context); | |
551 | } | |
552 | ||
553 | if (s->should_complete && data->ret == 0) { | |
e253f4b8 | 554 | BlockDriverState *to_replace = src; |
5a7e7a0b SH |
555 | if (s->to_replace) { |
556 | to_replace = s->to_replace; | |
557 | } | |
40365552 | 558 | |
e253f4b8 KW |
559 | if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) { |
560 | bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL); | |
5a7e7a0b | 561 | } |
b8804815 KW |
562 | |
563 | /* The mirror job has no requests in flight any more, but we need to | |
564 | * drain potential other users of the BDS before changing the graph. */ | |
e253f4b8 | 565 | bdrv_drained_begin(target_bs); |
5fe31c25 | 566 | bdrv_replace_node(to_replace, target_bs, &local_err); |
e253f4b8 | 567 | bdrv_drained_end(target_bs); |
5fe31c25 KW |
568 | if (local_err) { |
569 | error_report_err(local_err); | |
570 | data->ret = -EPERM; | |
571 | } | |
5a7e7a0b SH |
572 | } |
573 | if (s->to_replace) { | |
574 | bdrv_op_unblock_all(s->to_replace, s->replace_blocker); | |
575 | error_free(s->replace_blocker); | |
576 | bdrv_unref(s->to_replace); | |
577 | } | |
578 | if (replace_aio_context) { | |
579 | aio_context_release(replace_aio_context); | |
580 | } | |
581 | g_free(s->replaces); | |
7d9fcb39 | 582 | bdrv_unref(target_bs); |
4ef85a9c KW |
583 | |
584 | /* Remove the mirror filter driver from the graph. Before this, get rid of | |
585 | * the blockers on the intermediate nodes so that the resulting state is | |
0bf74767 KW |
586 | * valid. Also give up permissions on mirror_top_bs->backing, which might |
587 | * block the removal. */ | |
4ef85a9c | 588 | block_job_remove_all_bdrv(job); |
c1cef672 FZ |
589 | bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL, |
590 | &error_abort); | |
5fe31c25 | 591 | bdrv_replace_node(mirror_top_bs, backing_bs(mirror_top_bs), &error_abort); |
4ef85a9c KW |
592 | |
593 | /* We just changed the BDS the job BB refers to (with either or both of the | |
5fe31c25 KW |
594 | * bdrv_replace_node() calls), so switch the BB back so the cleanup does |
595 | * the right thing. We don't need any permissions any more now. */ | |
4ef85a9c KW |
596 | blk_remove_bs(job->blk); |
597 | blk_set_perm(job->blk, 0, BLK_PERM_ALL, &error_abort); | |
598 | blk_insert_bs(job->blk, mirror_top_bs, &error_abort); | |
599 | ||
5a7e7a0b | 600 | block_job_completed(&s->common, data->ret); |
4ef85a9c | 601 | |
5a7e7a0b | 602 | g_free(data); |
176c3699 | 603 | bdrv_drained_end(src); |
4ef85a9c | 604 | bdrv_unref(mirror_top_bs); |
3f09bfbc | 605 | bdrv_unref(src); |
5a7e7a0b SH |
606 | } |
607 | ||
49efb1f5 DL |
608 | static void mirror_throttle(MirrorBlockJob *s) |
609 | { | |
610 | int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); | |
611 | ||
612 | if (now - s->last_pause_ns > SLICE_TIME) { | |
613 | s->last_pause_ns = now; | |
614 | block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, 0); | |
615 | } else { | |
616 | block_job_pause_point(&s->common); | |
617 | } | |
618 | } | |
619 | ||
c0b363ad DL |
620 | static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s) |
621 | { | |
622 | int64_t sector_num, end; | |
623 | BlockDriverState *base = s->base; | |
4ef85a9c | 624 | BlockDriverState *bs = s->source; |
c0b363ad | 625 | BlockDriverState *target_bs = blk_bs(s->target); |
c0b363ad DL |
626 | int ret, n; |
627 | ||
628 | end = s->bdev_length / BDRV_SECTOR_SIZE; | |
629 | ||
b7d5062c | 630 | if (base == NULL && !bdrv_has_zero_init(target_bs)) { |
c7c2769c DL |
631 | if (!bdrv_can_write_zeroes_with_unmap(target_bs)) { |
632 | bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, end); | |
633 | return 0; | |
634 | } | |
635 | ||
90ab48eb | 636 | s->initial_zeroing_ongoing = true; |
c7c2769c DL |
637 | for (sector_num = 0; sector_num < end; ) { |
638 | int nb_sectors = MIN(end - sector_num, | |
639 | QEMU_ALIGN_DOWN(INT_MAX, s->granularity) >> BDRV_SECTOR_BITS); | |
640 | ||
641 | mirror_throttle(s); | |
642 | ||
643 | if (block_job_is_cancelled(&s->common)) { | |
90ab48eb | 644 | s->initial_zeroing_ongoing = false; |
c7c2769c DL |
645 | return 0; |
646 | } | |
647 | ||
648 | if (s->in_flight >= MAX_IN_FLIGHT) { | |
67adf4b3 EB |
649 | trace_mirror_yield(s, UINT64_MAX, s->buf_free_count, |
650 | s->in_flight); | |
c7c2769c DL |
651 | mirror_wait_for_io(s); |
652 | continue; | |
653 | } | |
654 | ||
655 | mirror_do_zero_or_discard(s, sector_num, nb_sectors, false); | |
656 | sector_num += nb_sectors; | |
657 | } | |
658 | ||
bae8196d | 659 | mirror_wait_for_all_io(s); |
90ab48eb | 660 | s->initial_zeroing_ongoing = false; |
b7d5062c DL |
661 | } |
662 | ||
c0b363ad DL |
663 | /* First part, loop on the sectors and initialize the dirty bitmap. */ |
664 | for (sector_num = 0; sector_num < end; ) { | |
665 | /* Just to make sure we are not exceeding int limit. */ | |
666 | int nb_sectors = MIN(INT_MAX >> BDRV_SECTOR_BITS, | |
667 | end - sector_num); | |
668 | ||
669 | mirror_throttle(s); | |
670 | ||
671 | if (block_job_is_cancelled(&s->common)) { | |
672 | return 0; | |
673 | } | |
674 | ||
675 | ret = bdrv_is_allocated_above(bs, base, sector_num, nb_sectors, &n); | |
676 | if (ret < 0) { | |
677 | return ret; | |
678 | } | |
679 | ||
680 | assert(n > 0); | |
b7d5062c | 681 | if (ret == 1) { |
c0b363ad DL |
682 | bdrv_set_dirty_bitmap(s->dirty_bitmap, sector_num, n); |
683 | } | |
684 | sector_num += n; | |
685 | } | |
686 | return 0; | |
687 | } | |
688 | ||
bdffb31d PB |
689 | /* Called when going out of the streaming phase to flush the bulk of the |
690 | * data to the medium, or just before completing. | |
691 | */ | |
692 | static int mirror_flush(MirrorBlockJob *s) | |
693 | { | |
694 | int ret = blk_flush(s->target); | |
695 | if (ret < 0) { | |
696 | if (mirror_error_action(s, false, -ret) == BLOCK_ERROR_ACTION_REPORT) { | |
697 | s->ret = ret; | |
698 | } | |
699 | } | |
700 | return ret; | |
701 | } | |
702 | ||
893f7eba PB |
703 | static void coroutine_fn mirror_run(void *opaque) |
704 | { | |
705 | MirrorBlockJob *s = opaque; | |
5a7e7a0b | 706 | MirrorExitData *data; |
4ef85a9c | 707 | BlockDriverState *bs = s->source; |
e253f4b8 | 708 | BlockDriverState *target_bs = blk_bs(s->target); |
9a0cec66 | 709 | bool need_drain = true; |
c0b363ad | 710 | int64_t length; |
b812f671 | 711 | BlockDriverInfo bdi; |
1d33936e JC |
712 | char backing_filename[2]; /* we only need 2 characters because we are only |
713 | checking for a NULL string */ | |
893f7eba | 714 | int ret = 0; |
e5b43573 | 715 | int target_cluster_size = BDRV_SECTOR_SIZE; |
893f7eba PB |
716 | |
717 | if (block_job_is_cancelled(&s->common)) { | |
718 | goto immediate_exit; | |
719 | } | |
720 | ||
b21c7652 HR |
721 | s->bdev_length = bdrv_getlength(bs); |
722 | if (s->bdev_length < 0) { | |
723 | ret = s->bdev_length; | |
373df5b1 | 724 | goto immediate_exit; |
becc347e KW |
725 | } |
726 | ||
727 | /* Active commit must resize the base image if its size differs from the | |
728 | * active layer. */ | |
729 | if (s->base == blk_bs(s->target)) { | |
730 | int64_t base_length; | |
731 | ||
732 | base_length = blk_getlength(s->target); | |
733 | if (base_length < 0) { | |
734 | ret = base_length; | |
735 | goto immediate_exit; | |
736 | } | |
737 | ||
738 | if (s->bdev_length > base_length) { | |
ed3d2ec9 | 739 | ret = blk_truncate(s->target, s->bdev_length, NULL); |
becc347e KW |
740 | if (ret < 0) { |
741 | goto immediate_exit; | |
742 | } | |
743 | } | |
744 | } | |
745 | ||
746 | if (s->bdev_length == 0) { | |
9e48b025 FZ |
747 | /* Report BLOCK_JOB_READY and wait for complete. */ |
748 | block_job_event_ready(&s->common); | |
749 | s->synced = true; | |
750 | while (!block_job_is_cancelled(&s->common) && !s->should_complete) { | |
751 | block_job_yield(&s->common); | |
752 | } | |
753 | s->common.cancelled = false; | |
754 | goto immediate_exit; | |
893f7eba PB |
755 | } |
756 | ||
b21c7652 | 757 | length = DIV_ROUND_UP(s->bdev_length, s->granularity); |
402a4741 PB |
758 | s->in_flight_bitmap = bitmap_new(length); |
759 | ||
b812f671 PB |
760 | /* If we have no backing file yet in the destination, we cannot let |
761 | * the destination do COW. Instead, we copy sectors around the | |
762 | * dirty data if needed. We need a bitmap to do that. | |
763 | */ | |
e253f4b8 | 764 | bdrv_get_backing_filename(target_bs, backing_filename, |
b812f671 | 765 | sizeof(backing_filename)); |
e253f4b8 | 766 | if (!bdrv_get_info(target_bs, &bdi) && bdi.cluster_size) { |
e5b43573 FZ |
767 | target_cluster_size = bdi.cluster_size; |
768 | } | |
e253f4b8 | 769 | if (backing_filename[0] && !target_bs->backing |
e5b43573 FZ |
770 | && s->granularity < target_cluster_size) { |
771 | s->buf_size = MAX(s->buf_size, target_cluster_size); | |
772 | s->cow_bitmap = bitmap_new(length); | |
b812f671 | 773 | } |
e5b43573 | 774 | s->target_cluster_sectors = target_cluster_size >> BDRV_SECTOR_BITS; |
e253f4b8 | 775 | s->max_iov = MIN(bs->bl.max_iov, target_bs->bl.max_iov); |
b812f671 | 776 | |
7504edf4 KW |
777 | s->buf = qemu_try_blockalign(bs, s->buf_size); |
778 | if (s->buf == NULL) { | |
779 | ret = -ENOMEM; | |
780 | goto immediate_exit; | |
781 | } | |
782 | ||
402a4741 | 783 | mirror_free_init(s); |
893f7eba | 784 | |
49efb1f5 | 785 | s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); |
03544a6e | 786 | if (!s->is_none_mode) { |
c0b363ad DL |
787 | ret = mirror_dirty_init(s); |
788 | if (ret < 0 || block_job_is_cancelled(&s->common)) { | |
789 | goto immediate_exit; | |
893f7eba PB |
790 | } |
791 | } | |
792 | ||
dc162c8e FZ |
793 | assert(!s->dbi); |
794 | s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap, 0); | |
893f7eba | 795 | for (;;) { |
cc8c9d6c | 796 | uint64_t delay_ns = 0; |
49efb1f5 | 797 | int64_t cnt, delta; |
893f7eba PB |
798 | bool should_complete; |
799 | ||
bd48bde8 PB |
800 | if (s->ret < 0) { |
801 | ret = s->ret; | |
802 | goto immediate_exit; | |
803 | } | |
804 | ||
565ac01f SH |
805 | block_job_pause_point(&s->common); |
806 | ||
20dca810 | 807 | cnt = bdrv_get_dirty_count(s->dirty_bitmap); |
b21c7652 HR |
808 | /* s->common.offset contains the number of bytes already processed so |
809 | * far, cnt is the number of dirty sectors remaining and | |
810 | * s->sectors_in_flight is the number of sectors currently being | |
811 | * processed; together those are the current total operation length */ | |
812 | s->common.len = s->common.offset + | |
813 | (cnt + s->sectors_in_flight) * BDRV_SECTOR_SIZE; | |
bd48bde8 PB |
814 | |
815 | /* Note that even when no rate limit is applied we need to yield | |
a7282330 | 816 | * periodically with no pending I/O so that bdrv_drain_all() returns. |
bd48bde8 PB |
817 | * We do so every SLICE_TIME nanoseconds, or when there is an error, |
818 | * or when the source is clean, whichever comes first. | |
819 | */ | |
49efb1f5 DL |
820 | delta = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->last_pause_ns; |
821 | if (delta < SLICE_TIME && | |
bd48bde8 | 822 | s->common.iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
cf56a3c6 | 823 | if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 || |
402a4741 | 824 | (cnt == 0 && s->in_flight > 0)) { |
67adf4b3 | 825 | trace_mirror_yield(s, cnt, s->buf_free_count, s->in_flight); |
21cd917f | 826 | mirror_wait_for_io(s); |
bd48bde8 PB |
827 | continue; |
828 | } else if (cnt != 0) { | |
cc8c9d6c | 829 | delay_ns = mirror_iteration(s); |
893f7eba | 830 | } |
893f7eba PB |
831 | } |
832 | ||
833 | should_complete = false; | |
bd48bde8 | 834 | if (s->in_flight == 0 && cnt == 0) { |
893f7eba | 835 | trace_mirror_before_flush(s); |
bdffb31d PB |
836 | if (!s->synced) { |
837 | if (mirror_flush(s) < 0) { | |
838 | /* Go check s->ret. */ | |
839 | continue; | |
b952b558 | 840 | } |
b952b558 PB |
841 | /* We're out of the streaming phase. From now on, if the job |
842 | * is cancelled we will actually complete all pending I/O and | |
843 | * report completion. This way, block-job-cancel will leave | |
844 | * the target in a consistent state. | |
845 | */ | |
bdffb31d PB |
846 | block_job_event_ready(&s->common); |
847 | s->synced = true; | |
d63ffd87 | 848 | } |
bdffb31d PB |
849 | |
850 | should_complete = s->should_complete || | |
851 | block_job_is_cancelled(&s->common); | |
852 | cnt = bdrv_get_dirty_count(s->dirty_bitmap); | |
893f7eba PB |
853 | } |
854 | ||
855 | if (cnt == 0 && should_complete) { | |
856 | /* The dirty bitmap is not updated while operations are pending. | |
857 | * If we're about to exit, wait for pending operations before | |
858 | * calling bdrv_get_dirty_count(bs), or we may exit while the | |
859 | * source has dirty data to copy! | |
860 | * | |
861 | * Note that I/O can be submitted by the guest while | |
9a0cec66 PB |
862 | * mirror_populate runs, so pause it now. Before deciding |
863 | * whether to switch to target check one last time if I/O has | |
864 | * come in the meanwhile, and if not flush the data to disk. | |
893f7eba PB |
865 | */ |
866 | trace_mirror_before_drain(s, cnt); | |
9a0cec66 PB |
867 | |
868 | bdrv_drained_begin(bs); | |
20dca810 | 869 | cnt = bdrv_get_dirty_count(s->dirty_bitmap); |
bdffb31d | 870 | if (cnt > 0 || mirror_flush(s) < 0) { |
9a0cec66 PB |
871 | bdrv_drained_end(bs); |
872 | continue; | |
873 | } | |
874 | ||
875 | /* The two disks are in sync. Exit and report successful | |
876 | * completion. | |
877 | */ | |
878 | assert(QLIST_EMPTY(&bs->tracked_requests)); | |
879 | s->common.cancelled = false; | |
880 | need_drain = false; | |
881 | break; | |
893f7eba PB |
882 | } |
883 | ||
884 | ret = 0; | |
cc8c9d6c | 885 | trace_mirror_before_sleep(s, cnt, s->synced, delay_ns); |
d63ffd87 | 886 | if (!s->synced) { |
7483d1e5 | 887 | block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); |
893f7eba PB |
888 | if (block_job_is_cancelled(&s->common)) { |
889 | break; | |
890 | } | |
891 | } else if (!should_complete) { | |
bd48bde8 | 892 | delay_ns = (s->in_flight == 0 && cnt == 0 ? SLICE_TIME : 0); |
7483d1e5 | 893 | block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); |
893f7eba | 894 | } |
49efb1f5 | 895 | s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); |
893f7eba PB |
896 | } |
897 | ||
898 | immediate_exit: | |
bd48bde8 PB |
899 | if (s->in_flight > 0) { |
900 | /* We get here only if something went wrong. Either the job failed, | |
901 | * or it was cancelled prematurely so that we do not guarantee that | |
902 | * the target is a copy of the source. | |
903 | */ | |
904 | assert(ret < 0 || (!s->synced && block_job_is_cancelled(&s->common))); | |
9a0cec66 | 905 | assert(need_drain); |
bae8196d | 906 | mirror_wait_for_all_io(s); |
bd48bde8 PB |
907 | } |
908 | ||
909 | assert(s->in_flight == 0); | |
7191bf31 | 910 | qemu_vfree(s->buf); |
b812f671 | 911 | g_free(s->cow_bitmap); |
402a4741 | 912 | g_free(s->in_flight_bitmap); |
dc162c8e | 913 | bdrv_dirty_iter_free(s->dbi); |
5a7e7a0b SH |
914 | |
915 | data = g_malloc(sizeof(*data)); | |
916 | data->ret = ret; | |
9a0cec66 PB |
917 | |
918 | if (need_drain) { | |
919 | bdrv_drained_begin(bs); | |
920 | } | |
5a7e7a0b | 921 | block_job_defer_to_main_loop(&s->common, mirror_exit, data); |
893f7eba PB |
922 | } |
923 | ||
924 | static void mirror_set_speed(BlockJob *job, int64_t speed, Error **errp) | |
925 | { | |
926 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
927 | ||
928 | if (speed < 0) { | |
c6bd8c70 | 929 | error_setg(errp, QERR_INVALID_PARAMETER, "speed"); |
893f7eba PB |
930 | return; |
931 | } | |
932 | ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME); | |
933 | } | |
934 | ||
d63ffd87 PB |
935 | static void mirror_complete(BlockJob *job, Error **errp) |
936 | { | |
937 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
4ef85a9c | 938 | BlockDriverState *target; |
274fccee | 939 | |
274fccee | 940 | target = blk_bs(s->target); |
d63ffd87 | 941 | |
d63ffd87 | 942 | if (!s->synced) { |
9df229c3 AG |
943 | error_setg(errp, "The active block job '%s' cannot be completed", |
944 | job->id); | |
d63ffd87 PB |
945 | return; |
946 | } | |
947 | ||
274fccee HR |
948 | if (s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) { |
949 | int ret; | |
950 | ||
951 | assert(!target->backing); | |
952 | ret = bdrv_open_backing_file(target, NULL, "backing", errp); | |
953 | if (ret < 0) { | |
954 | return; | |
955 | } | |
956 | } | |
957 | ||
15d67298 | 958 | /* block all operations on to_replace bs */ |
09158f00 | 959 | if (s->replaces) { |
5a7e7a0b SH |
960 | AioContext *replace_aio_context; |
961 | ||
e12f3784 | 962 | s->to_replace = bdrv_find_node(s->replaces); |
09158f00 | 963 | if (!s->to_replace) { |
e12f3784 | 964 | error_setg(errp, "Node name '%s' not found", s->replaces); |
09158f00 BC |
965 | return; |
966 | } | |
967 | ||
5a7e7a0b SH |
968 | replace_aio_context = bdrv_get_aio_context(s->to_replace); |
969 | aio_context_acquire(replace_aio_context); | |
970 | ||
4ef85a9c KW |
971 | /* TODO Translate this into permission system. Current definition of |
972 | * GRAPH_MOD would require to request it for the parents; they might | |
973 | * not even be BlockDriverStates, however, so a BdrvChild can't address | |
974 | * them. May need redefinition of GRAPH_MOD. */ | |
09158f00 BC |
975 | error_setg(&s->replace_blocker, |
976 | "block device is in use by block-job-complete"); | |
977 | bdrv_op_block_all(s->to_replace, s->replace_blocker); | |
978 | bdrv_ref(s->to_replace); | |
5a7e7a0b SH |
979 | |
980 | aio_context_release(replace_aio_context); | |
09158f00 BC |
981 | } |
982 | ||
d63ffd87 | 983 | s->should_complete = true; |
751ebd76 | 984 | block_job_enter(&s->common); |
d63ffd87 PB |
985 | } |
986 | ||
bae8196d | 987 | static void mirror_pause(BlockJob *job) |
565ac01f SH |
988 | { |
989 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
990 | ||
bae8196d | 991 | mirror_wait_for_all_io(s); |
565ac01f SH |
992 | } |
993 | ||
994 | static void mirror_attached_aio_context(BlockJob *job, AioContext *new_context) | |
995 | { | |
996 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
997 | ||
998 | blk_set_aio_context(s->target, new_context); | |
999 | } | |
1000 | ||
bae8196d PB |
1001 | static void mirror_drain(BlockJob *job) |
1002 | { | |
1003 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
1004 | ||
1005 | /* Need to keep a reference in case blk_drain triggers execution | |
1006 | * of mirror_complete... | |
1007 | */ | |
1008 | if (s->target) { | |
1009 | BlockBackend *target = s->target; | |
1010 | blk_ref(target); | |
1011 | blk_drain(target); | |
1012 | blk_unref(target); | |
1013 | } | |
1014 | } | |
1015 | ||
3fc4b10a | 1016 | static const BlockJobDriver mirror_job_driver = { |
565ac01f SH |
1017 | .instance_size = sizeof(MirrorBlockJob), |
1018 | .job_type = BLOCK_JOB_TYPE_MIRROR, | |
1019 | .set_speed = mirror_set_speed, | |
a7815a76 | 1020 | .start = mirror_run, |
565ac01f SH |
1021 | .complete = mirror_complete, |
1022 | .pause = mirror_pause, | |
1023 | .attached_aio_context = mirror_attached_aio_context, | |
bae8196d | 1024 | .drain = mirror_drain, |
893f7eba PB |
1025 | }; |
1026 | ||
03544a6e | 1027 | static const BlockJobDriver commit_active_job_driver = { |
565ac01f SH |
1028 | .instance_size = sizeof(MirrorBlockJob), |
1029 | .job_type = BLOCK_JOB_TYPE_COMMIT, | |
1030 | .set_speed = mirror_set_speed, | |
a7815a76 | 1031 | .start = mirror_run, |
565ac01f SH |
1032 | .complete = mirror_complete, |
1033 | .pause = mirror_pause, | |
1034 | .attached_aio_context = mirror_attached_aio_context, | |
bae8196d | 1035 | .drain = mirror_drain, |
03544a6e FZ |
1036 | }; |
1037 | ||
4ef85a9c KW |
1038 | static int coroutine_fn bdrv_mirror_top_preadv(BlockDriverState *bs, |
1039 | uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags) | |
1040 | { | |
1041 | return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags); | |
1042 | } | |
1043 | ||
1044 | static int coroutine_fn bdrv_mirror_top_pwritev(BlockDriverState *bs, | |
1045 | uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags) | |
1046 | { | |
1047 | return bdrv_co_pwritev(bs->backing, offset, bytes, qiov, flags); | |
1048 | } | |
1049 | ||
1050 | static int coroutine_fn bdrv_mirror_top_flush(BlockDriverState *bs) | |
1051 | { | |
1052 | return bdrv_co_flush(bs->backing->bs); | |
1053 | } | |
1054 | ||
1055 | static int64_t coroutine_fn bdrv_mirror_top_get_block_status( | |
1056 | BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum, | |
1057 | BlockDriverState **file) | |
1058 | { | |
1059 | *pnum = nb_sectors; | |
1060 | *file = bs->backing->bs; | |
1061 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA | | |
1062 | (sector_num << BDRV_SECTOR_BITS); | |
1063 | } | |
1064 | ||
1065 | static int coroutine_fn bdrv_mirror_top_pwrite_zeroes(BlockDriverState *bs, | |
1066 | int64_t offset, int count, BdrvRequestFlags flags) | |
1067 | { | |
1068 | return bdrv_co_pwrite_zeroes(bs->backing, offset, count, flags); | |
1069 | } | |
1070 | ||
1071 | static int coroutine_fn bdrv_mirror_top_pdiscard(BlockDriverState *bs, | |
1072 | int64_t offset, int count) | |
1073 | { | |
1074 | return bdrv_co_pdiscard(bs->backing->bs, offset, count); | |
1075 | } | |
1076 | ||
fd4a6493 KW |
1077 | static void bdrv_mirror_top_refresh_filename(BlockDriverState *bs, QDict *opts) |
1078 | { | |
1079 | bdrv_refresh_filename(bs->backing->bs); | |
1080 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), | |
1081 | bs->backing->bs->filename); | |
1082 | } | |
1083 | ||
4ef85a9c KW |
1084 | static void bdrv_mirror_top_close(BlockDriverState *bs) |
1085 | { | |
1086 | } | |
1087 | ||
1088 | static void bdrv_mirror_top_child_perm(BlockDriverState *bs, BdrvChild *c, | |
1089 | const BdrvChildRole *role, | |
1090 | uint64_t perm, uint64_t shared, | |
1091 | uint64_t *nperm, uint64_t *nshared) | |
1092 | { | |
1093 | /* Must be able to forward guest writes to the real image */ | |
1094 | *nperm = 0; | |
1095 | if (perm & BLK_PERM_WRITE) { | |
1096 | *nperm |= BLK_PERM_WRITE; | |
1097 | } | |
1098 | ||
1099 | *nshared = BLK_PERM_ALL; | |
1100 | } | |
1101 | ||
1102 | /* Dummy node that provides consistent read to its users without requiring it | |
1103 | * from its backing file and that allows writes on the backing file chain. */ | |
1104 | static BlockDriver bdrv_mirror_top = { | |
1105 | .format_name = "mirror_top", | |
1106 | .bdrv_co_preadv = bdrv_mirror_top_preadv, | |
1107 | .bdrv_co_pwritev = bdrv_mirror_top_pwritev, | |
1108 | .bdrv_co_pwrite_zeroes = bdrv_mirror_top_pwrite_zeroes, | |
1109 | .bdrv_co_pdiscard = bdrv_mirror_top_pdiscard, | |
1110 | .bdrv_co_flush = bdrv_mirror_top_flush, | |
1111 | .bdrv_co_get_block_status = bdrv_mirror_top_get_block_status, | |
fd4a6493 | 1112 | .bdrv_refresh_filename = bdrv_mirror_top_refresh_filename, |
4ef85a9c KW |
1113 | .bdrv_close = bdrv_mirror_top_close, |
1114 | .bdrv_child_perm = bdrv_mirror_top_child_perm, | |
1115 | }; | |
1116 | ||
71aa9867 | 1117 | static void mirror_start_job(const char *job_id, BlockDriverState *bs, |
47970dfb JS |
1118 | int creation_flags, BlockDriverState *target, |
1119 | const char *replaces, int64_t speed, | |
1120 | uint32_t granularity, int64_t buf_size, | |
274fccee | 1121 | BlockMirrorBackingMode backing_mode, |
09158f00 BC |
1122 | BlockdevOnError on_source_error, |
1123 | BlockdevOnError on_target_error, | |
0fc9f8ea | 1124 | bool unmap, |
097310b5 | 1125 | BlockCompletionFunc *cb, |
51ccfa2d | 1126 | void *opaque, |
09158f00 | 1127 | const BlockJobDriver *driver, |
b49f7ead | 1128 | bool is_none_mode, BlockDriverState *base, |
51ccfa2d FZ |
1129 | bool auto_complete, const char *filter_node_name, |
1130 | Error **errp) | |
893f7eba PB |
1131 | { |
1132 | MirrorBlockJob *s; | |
4ef85a9c KW |
1133 | BlockDriverState *mirror_top_bs; |
1134 | bool target_graph_mod; | |
1135 | bool target_is_backing; | |
b2c2832c | 1136 | Error *local_err = NULL; |
d7086422 | 1137 | int ret; |
893f7eba | 1138 | |
eee13dfe | 1139 | if (granularity == 0) { |
341ebc2f | 1140 | granularity = bdrv_get_default_bitmap_granularity(target); |
eee13dfe PB |
1141 | } |
1142 | ||
1143 | assert ((granularity & (granularity - 1)) == 0); | |
1144 | ||
48ac0a4d WC |
1145 | if (buf_size < 0) { |
1146 | error_setg(errp, "Invalid parameter 'buf-size'"); | |
1147 | return; | |
1148 | } | |
1149 | ||
1150 | if (buf_size == 0) { | |
1151 | buf_size = DEFAULT_MIRROR_BUF_SIZE; | |
1152 | } | |
5bc361b8 | 1153 | |
4ef85a9c KW |
1154 | /* In the case of active commit, add dummy driver to provide consistent |
1155 | * reads on the top, while disabling it in the intermediate nodes, and make | |
1156 | * the backing chain writable. */ | |
6cdbceb1 KW |
1157 | mirror_top_bs = bdrv_new_open_driver(&bdrv_mirror_top, filter_node_name, |
1158 | BDRV_O_RDWR, errp); | |
4ef85a9c KW |
1159 | if (mirror_top_bs == NULL) { |
1160 | return; | |
1161 | } | |
1162 | mirror_top_bs->total_sectors = bs->total_sectors; | |
19dd29e8 | 1163 | bdrv_set_aio_context(mirror_top_bs, bdrv_get_aio_context(bs)); |
4ef85a9c KW |
1164 | |
1165 | /* bdrv_append takes ownership of the mirror_top_bs reference, need to keep | |
7a25fcd0 | 1166 | * it alive until block_job_create() succeeds even if bs has no parent. */ |
4ef85a9c KW |
1167 | bdrv_ref(mirror_top_bs); |
1168 | bdrv_drained_begin(bs); | |
b2c2832c | 1169 | bdrv_append(mirror_top_bs, bs, &local_err); |
4ef85a9c KW |
1170 | bdrv_drained_end(bs); |
1171 | ||
b2c2832c KW |
1172 | if (local_err) { |
1173 | bdrv_unref(mirror_top_bs); | |
1174 | error_propagate(errp, local_err); | |
1175 | return; | |
1176 | } | |
1177 | ||
4ef85a9c KW |
1178 | /* Make sure that the source is not resized while the job is running */ |
1179 | s = block_job_create(job_id, driver, mirror_top_bs, | |
1180 | BLK_PERM_CONSISTENT_READ, | |
1181 | BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED | | |
1182 | BLK_PERM_WRITE | BLK_PERM_GRAPH_MOD, speed, | |
c6cc12bf | 1183 | creation_flags, cb, opaque, errp); |
893f7eba | 1184 | if (!s) { |
4ef85a9c | 1185 | goto fail; |
893f7eba | 1186 | } |
7a25fcd0 HR |
1187 | /* The block job now has a reference to this node */ |
1188 | bdrv_unref(mirror_top_bs); | |
1189 | ||
4ef85a9c KW |
1190 | s->source = bs; |
1191 | s->mirror_top_bs = mirror_top_bs; | |
1192 | ||
1193 | /* No resize for the target either; while the mirror is still running, a | |
1194 | * consistent read isn't necessarily possible. We could possibly allow | |
1195 | * writes and graph modifications, though it would likely defeat the | |
1196 | * purpose of a mirror, so leave them blocked for now. | |
1197 | * | |
1198 | * In the case of active commit, things look a bit different, though, | |
1199 | * because the target is an already populated backing file in active use. | |
1200 | * We can allow anything except resize there.*/ | |
1201 | target_is_backing = bdrv_chain_contains(bs, target); | |
1202 | target_graph_mod = (backing_mode != MIRROR_LEAVE_BACKING_CHAIN); | |
1203 | s->target = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE | | |
1204 | (target_graph_mod ? BLK_PERM_GRAPH_MOD : 0), | |
1205 | BLK_PERM_WRITE_UNCHANGED | | |
1206 | (target_is_backing ? BLK_PERM_CONSISTENT_READ | | |
1207 | BLK_PERM_WRITE | | |
1208 | BLK_PERM_GRAPH_MOD : 0)); | |
d7086422 KW |
1209 | ret = blk_insert_bs(s->target, target, errp); |
1210 | if (ret < 0) { | |
4ef85a9c | 1211 | goto fail; |
d7086422 | 1212 | } |
e253f4b8 | 1213 | |
09158f00 | 1214 | s->replaces = g_strdup(replaces); |
b952b558 PB |
1215 | s->on_source_error = on_source_error; |
1216 | s->on_target_error = on_target_error; | |
03544a6e | 1217 | s->is_none_mode = is_none_mode; |
274fccee | 1218 | s->backing_mode = backing_mode; |
5bc361b8 | 1219 | s->base = base; |
eee13dfe | 1220 | s->granularity = granularity; |
48ac0a4d | 1221 | s->buf_size = ROUND_UP(buf_size, granularity); |
0fc9f8ea | 1222 | s->unmap = unmap; |
b49f7ead WC |
1223 | if (auto_complete) { |
1224 | s->should_complete = true; | |
1225 | } | |
b812f671 | 1226 | |
0db6e54a | 1227 | s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); |
b8afb520 | 1228 | if (!s->dirty_bitmap) { |
88f9d1b3 | 1229 | goto fail; |
b8afb520 | 1230 | } |
10f3cd15 | 1231 | |
4ef85a9c | 1232 | /* Required permissions are already taken with blk_new() */ |
76d554e2 KW |
1233 | block_job_add_bdrv(&s->common, "target", target, 0, BLK_PERM_ALL, |
1234 | &error_abort); | |
1235 | ||
f3ede4b0 AG |
1236 | /* In commit_active_start() all intermediate nodes disappear, so |
1237 | * any jobs in them must be blocked */ | |
4ef85a9c | 1238 | if (target_is_backing) { |
f3ede4b0 AG |
1239 | BlockDriverState *iter; |
1240 | for (iter = backing_bs(bs); iter != target; iter = backing_bs(iter)) { | |
4ef85a9c KW |
1241 | /* XXX BLK_PERM_WRITE needs to be allowed so we don't block |
1242 | * ourselves at s->base (if writes are blocked for a node, they are | |
1243 | * also blocked for its backing file). The other options would be a | |
1244 | * second filter driver above s->base (== target). */ | |
1245 | ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0, | |
1246 | BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE, | |
1247 | errp); | |
1248 | if (ret < 0) { | |
1249 | goto fail; | |
1250 | } | |
f3ede4b0 AG |
1251 | } |
1252 | } | |
10f3cd15 | 1253 | |
5ccac6f1 JS |
1254 | trace_mirror_start(bs, s, opaque); |
1255 | block_job_start(&s->common); | |
4ef85a9c KW |
1256 | return; |
1257 | ||
1258 | fail: | |
1259 | if (s) { | |
7a25fcd0 HR |
1260 | /* Make sure this BDS does not go away until we have completed the graph |
1261 | * changes below */ | |
1262 | bdrv_ref(mirror_top_bs); | |
1263 | ||
4ef85a9c KW |
1264 | g_free(s->replaces); |
1265 | blk_unref(s->target); | |
05b0d8e3 | 1266 | block_job_early_fail(&s->common); |
4ef85a9c KW |
1267 | } |
1268 | ||
c1cef672 FZ |
1269 | bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL, |
1270 | &error_abort); | |
5fe31c25 | 1271 | bdrv_replace_node(mirror_top_bs, backing_bs(mirror_top_bs), &error_abort); |
7a25fcd0 HR |
1272 | |
1273 | bdrv_unref(mirror_top_bs); | |
893f7eba | 1274 | } |
03544a6e | 1275 | |
71aa9867 AG |
1276 | void mirror_start(const char *job_id, BlockDriverState *bs, |
1277 | BlockDriverState *target, const char *replaces, | |
5fba6c0e | 1278 | int64_t speed, uint32_t granularity, int64_t buf_size, |
274fccee HR |
1279 | MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, |
1280 | BlockdevOnError on_source_error, | |
03544a6e | 1281 | BlockdevOnError on_target_error, |
6cdbceb1 | 1282 | bool unmap, const char *filter_node_name, Error **errp) |
03544a6e FZ |
1283 | { |
1284 | bool is_none_mode; | |
1285 | BlockDriverState *base; | |
1286 | ||
4b80ab2b JS |
1287 | if (mode == MIRROR_SYNC_MODE_INCREMENTAL) { |
1288 | error_setg(errp, "Sync mode 'incremental' not supported"); | |
d58d8453 JS |
1289 | return; |
1290 | } | |
03544a6e | 1291 | is_none_mode = mode == MIRROR_SYNC_MODE_NONE; |
760e0063 | 1292 | base = mode == MIRROR_SYNC_MODE_TOP ? backing_bs(bs) : NULL; |
47970dfb | 1293 | mirror_start_job(job_id, bs, BLOCK_JOB_DEFAULT, target, replaces, |
274fccee | 1294 | speed, granularity, buf_size, backing_mode, |
51ccfa2d | 1295 | on_source_error, on_target_error, unmap, NULL, NULL, |
6cdbceb1 | 1296 | &mirror_job_driver, is_none_mode, base, false, |
51ccfa2d | 1297 | filter_node_name, errp); |
03544a6e FZ |
1298 | } |
1299 | ||
fd62c609 | 1300 | void commit_active_start(const char *job_id, BlockDriverState *bs, |
47970dfb JS |
1301 | BlockDriverState *base, int creation_flags, |
1302 | int64_t speed, BlockdevOnError on_error, | |
0db832f4 | 1303 | const char *filter_node_name, |
78bbd910 FZ |
1304 | BlockCompletionFunc *cb, void *opaque, |
1305 | bool auto_complete, Error **errp) | |
03544a6e | 1306 | { |
4da83585 | 1307 | int orig_base_flags; |
cc67f4d1 | 1308 | Error *local_err = NULL; |
4da83585 JC |
1309 | |
1310 | orig_base_flags = bdrv_get_flags(base); | |
1311 | ||
20a63d2c FZ |
1312 | if (bdrv_reopen(base, bs->open_flags, errp)) { |
1313 | return; | |
1314 | } | |
4da83585 | 1315 | |
47970dfb | 1316 | mirror_start_job(job_id, bs, creation_flags, base, NULL, speed, 0, 0, |
71aa9867 | 1317 | MIRROR_LEAVE_BACKING_CHAIN, |
51ccfa2d | 1318 | on_error, on_error, true, cb, opaque, |
6cdbceb1 | 1319 | &commit_active_job_driver, false, base, auto_complete, |
51ccfa2d | 1320 | filter_node_name, &local_err); |
0fb6395c | 1321 | if (local_err) { |
cc67f4d1 | 1322 | error_propagate(errp, local_err); |
4da83585 JC |
1323 | goto error_restore_flags; |
1324 | } | |
1325 | ||
1326 | return; | |
1327 | ||
1328 | error_restore_flags: | |
1329 | /* ignore error and errp for bdrv_reopen, because we want to propagate | |
1330 | * the original error */ | |
1331 | bdrv_reopen(base, orig_base_flags, NULL); | |
1332 | return; | |
03544a6e | 1333 | } |