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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" |
893f7eba | 15 | #include "trace.h" |
c87621ea | 16 | #include "block/blockjob_int.h" |
737e150e | 17 | #include "block/block_int.h" |
373340b2 | 18 | #include "sysemu/block-backend.h" |
da34e65c | 19 | #include "qapi/error.h" |
cc7a8ea7 | 20 | #include "qapi/qmp/qerror.h" |
893f7eba | 21 | #include "qemu/ratelimit.h" |
b812f671 | 22 | #include "qemu/bitmap.h" |
893f7eba | 23 | |
402a4741 PB |
24 | #define SLICE_TIME 100000000ULL /* ns */ |
25 | #define MAX_IN_FLIGHT 16 | |
0965a41e VSO |
26 | #define MAX_IO_SECTORS ((1 << 20) >> BDRV_SECTOR_BITS) /* 1 Mb */ |
27 | #define DEFAULT_MIRROR_BUF_SIZE \ | |
28 | (MAX_IN_FLIGHT * MAX_IO_SECTORS * BDRV_SECTOR_SIZE) | |
402a4741 PB |
29 | |
30 | /* The mirroring buffer is a list of granularity-sized chunks. | |
31 | * Free chunks are organized in a list. | |
32 | */ | |
33 | typedef struct MirrorBuffer { | |
34 | QSIMPLEQ_ENTRY(MirrorBuffer) next; | |
35 | } MirrorBuffer; | |
893f7eba PB |
36 | |
37 | typedef struct MirrorBlockJob { | |
38 | BlockJob common; | |
39 | RateLimit limit; | |
e253f4b8 | 40 | BlockBackend *target; |
4ef85a9c KW |
41 | BlockDriverState *mirror_top_bs; |
42 | BlockDriverState *source; | |
5bc361b8 | 43 | BlockDriverState *base; |
4ef85a9c | 44 | |
09158f00 BC |
45 | /* The name of the graph node to replace */ |
46 | char *replaces; | |
47 | /* The BDS to replace */ | |
48 | BlockDriverState *to_replace; | |
49 | /* Used to block operations on the drive-mirror-replace target */ | |
50 | Error *replace_blocker; | |
03544a6e | 51 | bool is_none_mode; |
274fccee | 52 | BlockMirrorBackingMode backing_mode; |
b952b558 | 53 | BlockdevOnError on_source_error, on_target_error; |
d63ffd87 PB |
54 | bool synced; |
55 | bool should_complete; | |
eee13dfe | 56 | int64_t granularity; |
b812f671 | 57 | size_t buf_size; |
b21c7652 | 58 | int64_t bdev_length; |
b812f671 | 59 | unsigned long *cow_bitmap; |
e4654d2d | 60 | BdrvDirtyBitmap *dirty_bitmap; |
dc162c8e | 61 | BdrvDirtyBitmapIter *dbi; |
893f7eba | 62 | uint8_t *buf; |
402a4741 PB |
63 | QSIMPLEQ_HEAD(, MirrorBuffer) buf_free; |
64 | int buf_free_count; | |
bd48bde8 | 65 | |
49efb1f5 | 66 | uint64_t last_pause_ns; |
402a4741 | 67 | unsigned long *in_flight_bitmap; |
bd48bde8 | 68 | int in_flight; |
531509ba | 69 | int64_t sectors_in_flight; |
bd48bde8 | 70 | int ret; |
0fc9f8ea | 71 | bool unmap; |
e424aff5 | 72 | bool waiting_for_io; |
e5b43573 FZ |
73 | int target_cluster_sectors; |
74 | int max_iov; | |
90ab48eb | 75 | bool initial_zeroing_ongoing; |
893f7eba PB |
76 | } MirrorBlockJob; |
77 | ||
bd48bde8 PB |
78 | typedef struct MirrorOp { |
79 | MirrorBlockJob *s; | |
80 | QEMUIOVector qiov; | |
bd48bde8 PB |
81 | int64_t sector_num; |
82 | int nb_sectors; | |
83 | } MirrorOp; | |
84 | ||
b952b558 PB |
85 | static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read, |
86 | int error) | |
87 | { | |
88 | s->synced = false; | |
89 | if (read) { | |
81e254dc KW |
90 | return block_job_error_action(&s->common, s->on_source_error, |
91 | true, error); | |
b952b558 | 92 | } else { |
81e254dc KW |
93 | return block_job_error_action(&s->common, s->on_target_error, |
94 | false, error); | |
b952b558 PB |
95 | } |
96 | } | |
97 | ||
bd48bde8 PB |
98 | static void mirror_iteration_done(MirrorOp *op, int ret) |
99 | { | |
100 | MirrorBlockJob *s = op->s; | |
402a4741 | 101 | struct iovec *iov; |
bd48bde8 | 102 | int64_t chunk_num; |
402a4741 | 103 | int i, nb_chunks, sectors_per_chunk; |
bd48bde8 PB |
104 | |
105 | trace_mirror_iteration_done(s, op->sector_num, op->nb_sectors, ret); | |
106 | ||
107 | s->in_flight--; | |
b21c7652 | 108 | s->sectors_in_flight -= op->nb_sectors; |
402a4741 PB |
109 | iov = op->qiov.iov; |
110 | for (i = 0; i < op->qiov.niov; i++) { | |
111 | MirrorBuffer *buf = (MirrorBuffer *) iov[i].iov_base; | |
112 | QSIMPLEQ_INSERT_TAIL(&s->buf_free, buf, next); | |
113 | s->buf_free_count++; | |
114 | } | |
115 | ||
bd48bde8 PB |
116 | sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; |
117 | chunk_num = op->sector_num / sectors_per_chunk; | |
4150ae60 | 118 | nb_chunks = DIV_ROUND_UP(op->nb_sectors, sectors_per_chunk); |
402a4741 | 119 | bitmap_clear(s->in_flight_bitmap, chunk_num, nb_chunks); |
b21c7652 HR |
120 | if (ret >= 0) { |
121 | if (s->cow_bitmap) { | |
122 | bitmap_set(s->cow_bitmap, chunk_num, nb_chunks); | |
123 | } | |
90ab48eb AN |
124 | if (!s->initial_zeroing_ongoing) { |
125 | s->common.offset += (uint64_t)op->nb_sectors * BDRV_SECTOR_SIZE; | |
126 | } | |
bd48bde8 | 127 | } |
6df3bf8e | 128 | qemu_iovec_destroy(&op->qiov); |
c84b3192 | 129 | g_free(op); |
7b770c72 | 130 | |
e424aff5 | 131 | if (s->waiting_for_io) { |
0b8b8753 | 132 | qemu_coroutine_enter(s->common.co); |
7b770c72 | 133 | } |
bd48bde8 PB |
134 | } |
135 | ||
136 | static void mirror_write_complete(void *opaque, int ret) | |
137 | { | |
138 | MirrorOp *op = opaque; | |
139 | MirrorBlockJob *s = op->s; | |
b9e413dd PB |
140 | |
141 | aio_context_acquire(blk_get_aio_context(s->common.blk)); | |
bd48bde8 | 142 | if (ret < 0) { |
bd48bde8 PB |
143 | BlockErrorAction action; |
144 | ||
20dca810 | 145 | bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors); |
bd48bde8 | 146 | action = mirror_error_action(s, false, -ret); |
a589569f | 147 | if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { |
bd48bde8 PB |
148 | s->ret = ret; |
149 | } | |
150 | } | |
151 | mirror_iteration_done(op, ret); | |
b9e413dd | 152 | aio_context_release(blk_get_aio_context(s->common.blk)); |
bd48bde8 PB |
153 | } |
154 | ||
155 | static void mirror_read_complete(void *opaque, int ret) | |
156 | { | |
157 | MirrorOp *op = opaque; | |
158 | MirrorBlockJob *s = op->s; | |
b9e413dd PB |
159 | |
160 | aio_context_acquire(blk_get_aio_context(s->common.blk)); | |
bd48bde8 | 161 | if (ret < 0) { |
bd48bde8 PB |
162 | BlockErrorAction action; |
163 | ||
20dca810 | 164 | bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors); |
bd48bde8 | 165 | action = mirror_error_action(s, true, -ret); |
a589569f | 166 | if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { |
bd48bde8 PB |
167 | s->ret = ret; |
168 | } | |
169 | ||
170 | mirror_iteration_done(op, ret); | |
b9e413dd PB |
171 | } else { |
172 | blk_aio_pwritev(s->target, op->sector_num * BDRV_SECTOR_SIZE, &op->qiov, | |
173 | 0, mirror_write_complete, op); | |
bd48bde8 | 174 | } |
b9e413dd | 175 | aio_context_release(blk_get_aio_context(s->common.blk)); |
bd48bde8 PB |
176 | } |
177 | ||
4150ae60 FZ |
178 | static inline void mirror_clip_sectors(MirrorBlockJob *s, |
179 | int64_t sector_num, | |
180 | int *nb_sectors) | |
181 | { | |
182 | *nb_sectors = MIN(*nb_sectors, | |
183 | s->bdev_length / BDRV_SECTOR_SIZE - sector_num); | |
184 | } | |
185 | ||
e5b43573 FZ |
186 | /* Round sector_num and/or nb_sectors to target cluster if COW is needed, and |
187 | * return the offset of the adjusted tail sector against original. */ | |
188 | static int mirror_cow_align(MirrorBlockJob *s, | |
189 | int64_t *sector_num, | |
190 | int *nb_sectors) | |
893f7eba | 191 | { |
e5b43573 FZ |
192 | bool need_cow; |
193 | int ret = 0; | |
194 | int chunk_sectors = s->granularity >> BDRV_SECTOR_BITS; | |
195 | int64_t align_sector_num = *sector_num; | |
196 | int align_nb_sectors = *nb_sectors; | |
197 | int max_sectors = chunk_sectors * s->max_iov; | |
198 | ||
199 | need_cow = !test_bit(*sector_num / chunk_sectors, s->cow_bitmap); | |
200 | need_cow |= !test_bit((*sector_num + *nb_sectors - 1) / chunk_sectors, | |
201 | s->cow_bitmap); | |
202 | if (need_cow) { | |
244483e6 KW |
203 | bdrv_round_sectors_to_clusters(blk_bs(s->target), *sector_num, |
204 | *nb_sectors, &align_sector_num, | |
205 | &align_nb_sectors); | |
e5b43573 | 206 | } |
3515727f | 207 | |
e5b43573 FZ |
208 | if (align_nb_sectors > max_sectors) { |
209 | align_nb_sectors = max_sectors; | |
210 | if (need_cow) { | |
211 | align_nb_sectors = QEMU_ALIGN_DOWN(align_nb_sectors, | |
212 | s->target_cluster_sectors); | |
213 | } | |
8f0720ec | 214 | } |
4150ae60 FZ |
215 | /* Clipping may result in align_nb_sectors unaligned to chunk boundary, but |
216 | * that doesn't matter because it's already the end of source image. */ | |
217 | mirror_clip_sectors(s, align_sector_num, &align_nb_sectors); | |
8f0720ec | 218 | |
e5b43573 FZ |
219 | ret = align_sector_num + align_nb_sectors - (*sector_num + *nb_sectors); |
220 | *sector_num = align_sector_num; | |
221 | *nb_sectors = align_nb_sectors; | |
222 | assert(ret >= 0); | |
223 | return ret; | |
224 | } | |
225 | ||
21cd917f FZ |
226 | static inline void mirror_wait_for_io(MirrorBlockJob *s) |
227 | { | |
228 | assert(!s->waiting_for_io); | |
229 | s->waiting_for_io = true; | |
230 | qemu_coroutine_yield(); | |
231 | s->waiting_for_io = false; | |
232 | } | |
233 | ||
e5b43573 | 234 | /* Submit async read while handling COW. |
17612955 JS |
235 | * Returns: The number of sectors copied after and including sector_num, |
236 | * excluding any sectors copied prior to sector_num due to alignment. | |
237 | * This will be nb_sectors if no alignment is necessary, or | |
e5b43573 FZ |
238 | * (new_end - sector_num) if tail is rounded up or down due to |
239 | * alignment or buffer limit. | |
240 | */ | |
241 | static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num, | |
242 | int nb_sectors) | |
243 | { | |
e253f4b8 | 244 | BlockBackend *source = s->common.blk; |
e5b43573 | 245 | int sectors_per_chunk, nb_chunks; |
17612955 | 246 | int ret; |
e5b43573 | 247 | MirrorOp *op; |
e4808881 | 248 | int max_sectors; |
e5b43573 | 249 | |
884fea4e | 250 | sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; |
e4808881 | 251 | max_sectors = sectors_per_chunk * s->max_iov; |
402a4741 | 252 | |
e5b43573 FZ |
253 | /* We can only handle as much as buf_size at a time. */ |
254 | nb_sectors = MIN(s->buf_size >> BDRV_SECTOR_BITS, nb_sectors); | |
e4808881 | 255 | nb_sectors = MIN(max_sectors, nb_sectors); |
e5b43573 | 256 | assert(nb_sectors); |
17612955 | 257 | ret = nb_sectors; |
402a4741 | 258 | |
e5b43573 FZ |
259 | if (s->cow_bitmap) { |
260 | ret += mirror_cow_align(s, §or_num, &nb_sectors); | |
261 | } | |
262 | assert(nb_sectors << BDRV_SECTOR_BITS <= s->buf_size); | |
263 | /* The sector range must meet granularity because: | |
264 | * 1) Caller passes in aligned values; | |
265 | * 2) mirror_cow_align is used only when target cluster is larger. */ | |
e5b43573 | 266 | assert(!(sector_num % sectors_per_chunk)); |
4150ae60 | 267 | nb_chunks = DIV_ROUND_UP(nb_sectors, sectors_per_chunk); |
e5b43573 FZ |
268 | |
269 | while (s->buf_free_count < nb_chunks) { | |
402a4741 | 270 | trace_mirror_yield_in_flight(s, sector_num, s->in_flight); |
21cd917f | 271 | mirror_wait_for_io(s); |
b812f671 PB |
272 | } |
273 | ||
bd48bde8 | 274 | /* Allocate a MirrorOp that is used as an AIO callback. */ |
c84b3192 | 275 | op = g_new(MirrorOp, 1); |
bd48bde8 | 276 | op->s = s; |
bd48bde8 PB |
277 | op->sector_num = sector_num; |
278 | op->nb_sectors = nb_sectors; | |
402a4741 PB |
279 | |
280 | /* Now make a QEMUIOVector taking enough granularity-sized chunks | |
281 | * from s->buf_free. | |
282 | */ | |
283 | qemu_iovec_init(&op->qiov, nb_chunks); | |
402a4741 PB |
284 | while (nb_chunks-- > 0) { |
285 | MirrorBuffer *buf = QSIMPLEQ_FIRST(&s->buf_free); | |
e5b43573 | 286 | size_t remaining = nb_sectors * BDRV_SECTOR_SIZE - op->qiov.size; |
5a0f6fd5 | 287 | |
402a4741 PB |
288 | QSIMPLEQ_REMOVE_HEAD(&s->buf_free, next); |
289 | s->buf_free_count--; | |
5a0f6fd5 | 290 | qemu_iovec_add(&op->qiov, buf, MIN(s->granularity, remaining)); |
402a4741 | 291 | } |
bd48bde8 | 292 | |
893f7eba | 293 | /* Copy the dirty cluster. */ |
bd48bde8 | 294 | s->in_flight++; |
b21c7652 | 295 | s->sectors_in_flight += nb_sectors; |
b812f671 | 296 | trace_mirror_one_iteration(s, sector_num, nb_sectors); |
dcfb3beb | 297 | |
73698c30 | 298 | blk_aio_preadv(source, sector_num * BDRV_SECTOR_SIZE, &op->qiov, 0, |
e5b43573 FZ |
299 | mirror_read_complete, op); |
300 | return ret; | |
301 | } | |
302 | ||
303 | static void mirror_do_zero_or_discard(MirrorBlockJob *s, | |
304 | int64_t sector_num, | |
305 | int nb_sectors, | |
306 | bool is_discard) | |
307 | { | |
308 | MirrorOp *op; | |
309 | ||
310 | /* Allocate a MirrorOp that is used as an AIO callback. The qiov is zeroed | |
311 | * so the freeing in mirror_iteration_done is nop. */ | |
312 | op = g_new0(MirrorOp, 1); | |
313 | op->s = s; | |
314 | op->sector_num = sector_num; | |
315 | op->nb_sectors = nb_sectors; | |
316 | ||
317 | s->in_flight++; | |
318 | s->sectors_in_flight += nb_sectors; | |
319 | if (is_discard) { | |
1c6c4bb7 EB |
320 | blk_aio_pdiscard(s->target, sector_num << BDRV_SECTOR_BITS, |
321 | op->nb_sectors << BDRV_SECTOR_BITS, | |
322 | mirror_write_complete, op); | |
e5b43573 | 323 | } else { |
e253f4b8 KW |
324 | blk_aio_pwrite_zeroes(s->target, sector_num * BDRV_SECTOR_SIZE, |
325 | op->nb_sectors * BDRV_SECTOR_SIZE, | |
dcfb3beb FZ |
326 | s->unmap ? BDRV_REQ_MAY_UNMAP : 0, |
327 | mirror_write_complete, op); | |
e5b43573 FZ |
328 | } |
329 | } | |
330 | ||
331 | static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) | |
332 | { | |
4ef85a9c | 333 | BlockDriverState *source = s->source; |
9c83625b | 334 | int64_t sector_num, first_chunk; |
e5b43573 FZ |
335 | uint64_t delay_ns = 0; |
336 | /* At least the first dirty chunk is mirrored in one iteration. */ | |
337 | int nb_chunks = 1; | |
338 | int64_t end = s->bdev_length / BDRV_SECTOR_SIZE; | |
339 | int sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; | |
4b5004d9 | 340 | bool write_zeroes_ok = bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)); |
0965a41e VSO |
341 | int max_io_sectors = MAX((s->buf_size >> BDRV_SECTOR_BITS) / MAX_IN_FLIGHT, |
342 | MAX_IO_SECTORS); | |
e5b43573 | 343 | |
dc162c8e | 344 | sector_num = bdrv_dirty_iter_next(s->dbi); |
e5b43573 | 345 | if (sector_num < 0) { |
dc162c8e FZ |
346 | bdrv_set_dirty_iter(s->dbi, 0); |
347 | sector_num = bdrv_dirty_iter_next(s->dbi); | |
e5b43573 FZ |
348 | trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap)); |
349 | assert(sector_num >= 0); | |
350 | } | |
351 | ||
9c83625b HR |
352 | first_chunk = sector_num / sectors_per_chunk; |
353 | while (test_bit(first_chunk, s->in_flight_bitmap)) { | |
ff04198b | 354 | trace_mirror_yield_in_flight(s, sector_num, s->in_flight); |
9c83625b HR |
355 | mirror_wait_for_io(s); |
356 | } | |
357 | ||
565ac01f SH |
358 | block_job_pause_point(&s->common); |
359 | ||
e5b43573 FZ |
360 | /* Find the number of consective dirty chunks following the first dirty |
361 | * one, and wait for in flight requests in them. */ | |
362 | while (nb_chunks * sectors_per_chunk < (s->buf_size >> BDRV_SECTOR_BITS)) { | |
dc162c8e | 363 | int64_t next_dirty; |
e5b43573 FZ |
364 | int64_t next_sector = sector_num + nb_chunks * sectors_per_chunk; |
365 | int64_t next_chunk = next_sector / sectors_per_chunk; | |
366 | if (next_sector >= end || | |
367 | !bdrv_get_dirty(source, s->dirty_bitmap, next_sector)) { | |
368 | break; | |
369 | } | |
370 | if (test_bit(next_chunk, s->in_flight_bitmap)) { | |
9c83625b | 371 | break; |
e5b43573 | 372 | } |
9c83625b | 373 | |
dc162c8e FZ |
374 | next_dirty = bdrv_dirty_iter_next(s->dbi); |
375 | if (next_dirty > next_sector || next_dirty < 0) { | |
f27a2742 | 376 | /* The bitmap iterator's cache is stale, refresh it */ |
dc162c8e FZ |
377 | bdrv_set_dirty_iter(s->dbi, next_sector); |
378 | next_dirty = bdrv_dirty_iter_next(s->dbi); | |
f27a2742 | 379 | } |
dc162c8e | 380 | assert(next_dirty == next_sector); |
9c83625b | 381 | nb_chunks++; |
e5b43573 FZ |
382 | } |
383 | ||
384 | /* Clear dirty bits before querying the block status, because | |
385 | * calling bdrv_get_block_status_above could yield - if some blocks are | |
386 | * marked dirty in this window, we need to know. | |
387 | */ | |
388 | bdrv_reset_dirty_bitmap(s->dirty_bitmap, sector_num, | |
389 | nb_chunks * sectors_per_chunk); | |
390 | bitmap_set(s->in_flight_bitmap, sector_num / sectors_per_chunk, nb_chunks); | |
391 | while (nb_chunks > 0 && sector_num < end) { | |
39c11580 | 392 | int64_t ret; |
4b5004d9 | 393 | int io_sectors, io_sectors_acct; |
e5b43573 FZ |
394 | BlockDriverState *file; |
395 | enum MirrorMethod { | |
396 | MIRROR_METHOD_COPY, | |
397 | MIRROR_METHOD_ZERO, | |
398 | MIRROR_METHOD_DISCARD | |
399 | } mirror_method = MIRROR_METHOD_COPY; | |
400 | ||
401 | assert(!(sector_num % sectors_per_chunk)); | |
402 | ret = bdrv_get_block_status_above(source, NULL, sector_num, | |
403 | nb_chunks * sectors_per_chunk, | |
404 | &io_sectors, &file); | |
405 | if (ret < 0) { | |
0965a41e VSO |
406 | io_sectors = MIN(nb_chunks * sectors_per_chunk, max_io_sectors); |
407 | } else if (ret & BDRV_BLOCK_DATA) { | |
408 | io_sectors = MIN(io_sectors, max_io_sectors); | |
e5b43573 FZ |
409 | } |
410 | ||
411 | io_sectors -= io_sectors % sectors_per_chunk; | |
412 | if (io_sectors < sectors_per_chunk) { | |
413 | io_sectors = sectors_per_chunk; | |
414 | } else if (ret >= 0 && !(ret & BDRV_BLOCK_DATA)) { | |
415 | int64_t target_sector_num; | |
416 | int target_nb_sectors; | |
244483e6 KW |
417 | bdrv_round_sectors_to_clusters(blk_bs(s->target), sector_num, |
418 | io_sectors, &target_sector_num, | |
419 | &target_nb_sectors); | |
e5b43573 FZ |
420 | if (target_sector_num == sector_num && |
421 | target_nb_sectors == io_sectors) { | |
422 | mirror_method = ret & BDRV_BLOCK_ZERO ? | |
423 | MIRROR_METHOD_ZERO : | |
424 | MIRROR_METHOD_DISCARD; | |
425 | } | |
426 | } | |
427 | ||
cf56a3c6 DL |
428 | while (s->in_flight >= MAX_IN_FLIGHT) { |
429 | trace_mirror_yield_in_flight(s, sector_num, s->in_flight); | |
430 | mirror_wait_for_io(s); | |
431 | } | |
432 | ||
dbaa7b57 VSO |
433 | if (s->ret < 0) { |
434 | return 0; | |
435 | } | |
436 | ||
4150ae60 | 437 | mirror_clip_sectors(s, sector_num, &io_sectors); |
e5b43573 FZ |
438 | switch (mirror_method) { |
439 | case MIRROR_METHOD_COPY: | |
440 | io_sectors = mirror_do_read(s, sector_num, io_sectors); | |
4b5004d9 | 441 | io_sectors_acct = io_sectors; |
e5b43573 FZ |
442 | break; |
443 | case MIRROR_METHOD_ZERO: | |
e5b43573 | 444 | case MIRROR_METHOD_DISCARD: |
4b5004d9 DL |
445 | mirror_do_zero_or_discard(s, sector_num, io_sectors, |
446 | mirror_method == MIRROR_METHOD_DISCARD); | |
447 | if (write_zeroes_ok) { | |
448 | io_sectors_acct = 0; | |
449 | } else { | |
450 | io_sectors_acct = io_sectors; | |
451 | } | |
e5b43573 FZ |
452 | break; |
453 | default: | |
454 | abort(); | |
455 | } | |
456 | assert(io_sectors); | |
457 | sector_num += io_sectors; | |
4150ae60 | 458 | nb_chunks -= DIV_ROUND_UP(io_sectors, sectors_per_chunk); |
f14a39cc | 459 | if (s->common.speed) { |
4b5004d9 | 460 | delay_ns = ratelimit_calculate_delay(&s->limit, io_sectors_acct); |
f14a39cc | 461 | } |
dcfb3beb | 462 | } |
cc8c9d6c | 463 | return delay_ns; |
bd48bde8 | 464 | } |
b952b558 | 465 | |
402a4741 PB |
466 | static void mirror_free_init(MirrorBlockJob *s) |
467 | { | |
468 | int granularity = s->granularity; | |
469 | size_t buf_size = s->buf_size; | |
470 | uint8_t *buf = s->buf; | |
471 | ||
472 | assert(s->buf_free_count == 0); | |
473 | QSIMPLEQ_INIT(&s->buf_free); | |
474 | while (buf_size != 0) { | |
475 | MirrorBuffer *cur = (MirrorBuffer *)buf; | |
476 | QSIMPLEQ_INSERT_TAIL(&s->buf_free, cur, next); | |
477 | s->buf_free_count++; | |
478 | buf_size -= granularity; | |
479 | buf += granularity; | |
480 | } | |
481 | } | |
482 | ||
bae8196d PB |
483 | /* This is also used for the .pause callback. There is no matching |
484 | * mirror_resume() because mirror_run() will begin iterating again | |
485 | * when the job is resumed. | |
486 | */ | |
487 | static void mirror_wait_for_all_io(MirrorBlockJob *s) | |
bd48bde8 PB |
488 | { |
489 | while (s->in_flight > 0) { | |
21cd917f | 490 | mirror_wait_for_io(s); |
bd48bde8 | 491 | } |
893f7eba PB |
492 | } |
493 | ||
5a7e7a0b SH |
494 | typedef struct { |
495 | int ret; | |
496 | } MirrorExitData; | |
497 | ||
498 | static void mirror_exit(BlockJob *job, void *opaque) | |
499 | { | |
500 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
501 | MirrorExitData *data = opaque; | |
502 | AioContext *replace_aio_context = NULL; | |
4ef85a9c | 503 | BlockDriverState *src = s->source; |
e253f4b8 | 504 | BlockDriverState *target_bs = blk_bs(s->target); |
4ef85a9c | 505 | BlockDriverState *mirror_top_bs = s->mirror_top_bs; |
12fa4af6 | 506 | Error *local_err = NULL; |
3f09bfbc KW |
507 | |
508 | /* Make sure that the source BDS doesn't go away before we called | |
509 | * block_job_completed(). */ | |
510 | bdrv_ref(src); | |
4ef85a9c KW |
511 | bdrv_ref(mirror_top_bs); |
512 | ||
513 | /* We don't access the source any more. Dropping any WRITE/RESIZE is | |
514 | * required before it could become a backing file of target_bs. */ | |
515 | bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL, | |
516 | &error_abort); | |
517 | if (s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) { | |
518 | BlockDriverState *backing = s->is_none_mode ? src : s->base; | |
519 | if (backing_bs(target_bs) != backing) { | |
12fa4af6 KW |
520 | bdrv_set_backing_hd(target_bs, backing, &local_err); |
521 | if (local_err) { | |
522 | error_report_err(local_err); | |
523 | data->ret = -EPERM; | |
524 | } | |
4ef85a9c KW |
525 | } |
526 | } | |
5a7e7a0b SH |
527 | |
528 | if (s->to_replace) { | |
529 | replace_aio_context = bdrv_get_aio_context(s->to_replace); | |
530 | aio_context_acquire(replace_aio_context); | |
531 | } | |
532 | ||
533 | if (s->should_complete && data->ret == 0) { | |
e253f4b8 | 534 | BlockDriverState *to_replace = src; |
5a7e7a0b SH |
535 | if (s->to_replace) { |
536 | to_replace = s->to_replace; | |
537 | } | |
40365552 | 538 | |
e253f4b8 KW |
539 | if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) { |
540 | bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL); | |
5a7e7a0b | 541 | } |
b8804815 KW |
542 | |
543 | /* The mirror job has no requests in flight any more, but we need to | |
544 | * drain potential other users of the BDS before changing the graph. */ | |
e253f4b8 KW |
545 | bdrv_drained_begin(target_bs); |
546 | bdrv_replace_in_backing_chain(to_replace, target_bs); | |
547 | bdrv_drained_end(target_bs); | |
5a7e7a0b SH |
548 | } |
549 | if (s->to_replace) { | |
550 | bdrv_op_unblock_all(s->to_replace, s->replace_blocker); | |
551 | error_free(s->replace_blocker); | |
552 | bdrv_unref(s->to_replace); | |
553 | } | |
554 | if (replace_aio_context) { | |
555 | aio_context_release(replace_aio_context); | |
556 | } | |
557 | g_free(s->replaces); | |
e253f4b8 | 558 | blk_unref(s->target); |
bae8196d | 559 | s->target = NULL; |
4ef85a9c KW |
560 | |
561 | /* Remove the mirror filter driver from the graph. Before this, get rid of | |
562 | * the blockers on the intermediate nodes so that the resulting state is | |
563 | * valid. */ | |
564 | block_job_remove_all_bdrv(job); | |
565 | bdrv_replace_in_backing_chain(mirror_top_bs, backing_bs(mirror_top_bs)); | |
566 | ||
567 | /* We just changed the BDS the job BB refers to (with either or both of the | |
568 | * bdrv_replace_in_backing_chain() calls), so switch the BB back so the | |
569 | * cleanup does the right thing. We don't need any permissions any more | |
570 | * now. */ | |
571 | blk_remove_bs(job->blk); | |
572 | blk_set_perm(job->blk, 0, BLK_PERM_ALL, &error_abort); | |
573 | blk_insert_bs(job->blk, mirror_top_bs, &error_abort); | |
574 | ||
5a7e7a0b | 575 | block_job_completed(&s->common, data->ret); |
4ef85a9c | 576 | |
5a7e7a0b | 577 | g_free(data); |
176c3699 | 578 | bdrv_drained_end(src); |
4ef85a9c | 579 | bdrv_unref(mirror_top_bs); |
3f09bfbc | 580 | bdrv_unref(src); |
5a7e7a0b SH |
581 | } |
582 | ||
49efb1f5 DL |
583 | static void mirror_throttle(MirrorBlockJob *s) |
584 | { | |
585 | int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); | |
586 | ||
587 | if (now - s->last_pause_ns > SLICE_TIME) { | |
588 | s->last_pause_ns = now; | |
589 | block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, 0); | |
590 | } else { | |
591 | block_job_pause_point(&s->common); | |
592 | } | |
593 | } | |
594 | ||
c0b363ad DL |
595 | static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s) |
596 | { | |
597 | int64_t sector_num, end; | |
598 | BlockDriverState *base = s->base; | |
4ef85a9c | 599 | BlockDriverState *bs = s->source; |
c0b363ad | 600 | BlockDriverState *target_bs = blk_bs(s->target); |
c0b363ad DL |
601 | int ret, n; |
602 | ||
603 | end = s->bdev_length / BDRV_SECTOR_SIZE; | |
604 | ||
b7d5062c | 605 | if (base == NULL && !bdrv_has_zero_init(target_bs)) { |
c7c2769c DL |
606 | if (!bdrv_can_write_zeroes_with_unmap(target_bs)) { |
607 | bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, end); | |
608 | return 0; | |
609 | } | |
610 | ||
90ab48eb | 611 | s->initial_zeroing_ongoing = true; |
c7c2769c DL |
612 | for (sector_num = 0; sector_num < end; ) { |
613 | int nb_sectors = MIN(end - sector_num, | |
614 | QEMU_ALIGN_DOWN(INT_MAX, s->granularity) >> BDRV_SECTOR_BITS); | |
615 | ||
616 | mirror_throttle(s); | |
617 | ||
618 | if (block_job_is_cancelled(&s->common)) { | |
90ab48eb | 619 | s->initial_zeroing_ongoing = false; |
c7c2769c DL |
620 | return 0; |
621 | } | |
622 | ||
623 | if (s->in_flight >= MAX_IN_FLIGHT) { | |
624 | trace_mirror_yield(s, s->in_flight, s->buf_free_count, -1); | |
625 | mirror_wait_for_io(s); | |
626 | continue; | |
627 | } | |
628 | ||
629 | mirror_do_zero_or_discard(s, sector_num, nb_sectors, false); | |
630 | sector_num += nb_sectors; | |
631 | } | |
632 | ||
bae8196d | 633 | mirror_wait_for_all_io(s); |
90ab48eb | 634 | s->initial_zeroing_ongoing = false; |
b7d5062c DL |
635 | } |
636 | ||
c0b363ad DL |
637 | /* First part, loop on the sectors and initialize the dirty bitmap. */ |
638 | for (sector_num = 0; sector_num < end; ) { | |
639 | /* Just to make sure we are not exceeding int limit. */ | |
640 | int nb_sectors = MIN(INT_MAX >> BDRV_SECTOR_BITS, | |
641 | end - sector_num); | |
642 | ||
643 | mirror_throttle(s); | |
644 | ||
645 | if (block_job_is_cancelled(&s->common)) { | |
646 | return 0; | |
647 | } | |
648 | ||
649 | ret = bdrv_is_allocated_above(bs, base, sector_num, nb_sectors, &n); | |
650 | if (ret < 0) { | |
651 | return ret; | |
652 | } | |
653 | ||
654 | assert(n > 0); | |
b7d5062c | 655 | if (ret == 1) { |
c0b363ad DL |
656 | bdrv_set_dirty_bitmap(s->dirty_bitmap, sector_num, n); |
657 | } | |
658 | sector_num += n; | |
659 | } | |
660 | return 0; | |
661 | } | |
662 | ||
bdffb31d PB |
663 | /* Called when going out of the streaming phase to flush the bulk of the |
664 | * data to the medium, or just before completing. | |
665 | */ | |
666 | static int mirror_flush(MirrorBlockJob *s) | |
667 | { | |
668 | int ret = blk_flush(s->target); | |
669 | if (ret < 0) { | |
670 | if (mirror_error_action(s, false, -ret) == BLOCK_ERROR_ACTION_REPORT) { | |
671 | s->ret = ret; | |
672 | } | |
673 | } | |
674 | return ret; | |
675 | } | |
676 | ||
893f7eba PB |
677 | static void coroutine_fn mirror_run(void *opaque) |
678 | { | |
679 | MirrorBlockJob *s = opaque; | |
5a7e7a0b | 680 | MirrorExitData *data; |
4ef85a9c | 681 | BlockDriverState *bs = s->source; |
e253f4b8 | 682 | BlockDriverState *target_bs = blk_bs(s->target); |
9a0cec66 | 683 | bool need_drain = true; |
c0b363ad | 684 | int64_t length; |
b812f671 | 685 | BlockDriverInfo bdi; |
1d33936e JC |
686 | char backing_filename[2]; /* we only need 2 characters because we are only |
687 | checking for a NULL string */ | |
893f7eba | 688 | int ret = 0; |
e5b43573 | 689 | int target_cluster_size = BDRV_SECTOR_SIZE; |
893f7eba PB |
690 | |
691 | if (block_job_is_cancelled(&s->common)) { | |
692 | goto immediate_exit; | |
693 | } | |
694 | ||
b21c7652 HR |
695 | s->bdev_length = bdrv_getlength(bs); |
696 | if (s->bdev_length < 0) { | |
697 | ret = s->bdev_length; | |
373df5b1 | 698 | goto immediate_exit; |
becc347e KW |
699 | } |
700 | ||
701 | /* Active commit must resize the base image if its size differs from the | |
702 | * active layer. */ | |
703 | if (s->base == blk_bs(s->target)) { | |
704 | int64_t base_length; | |
705 | ||
706 | base_length = blk_getlength(s->target); | |
707 | if (base_length < 0) { | |
708 | ret = base_length; | |
709 | goto immediate_exit; | |
710 | } | |
711 | ||
712 | if (s->bdev_length > base_length) { | |
713 | ret = blk_truncate(s->target, s->bdev_length); | |
714 | if (ret < 0) { | |
715 | goto immediate_exit; | |
716 | } | |
717 | } | |
718 | } | |
719 | ||
720 | if (s->bdev_length == 0) { | |
9e48b025 FZ |
721 | /* Report BLOCK_JOB_READY and wait for complete. */ |
722 | block_job_event_ready(&s->common); | |
723 | s->synced = true; | |
724 | while (!block_job_is_cancelled(&s->common) && !s->should_complete) { | |
725 | block_job_yield(&s->common); | |
726 | } | |
727 | s->common.cancelled = false; | |
728 | goto immediate_exit; | |
893f7eba PB |
729 | } |
730 | ||
b21c7652 | 731 | length = DIV_ROUND_UP(s->bdev_length, s->granularity); |
402a4741 PB |
732 | s->in_flight_bitmap = bitmap_new(length); |
733 | ||
b812f671 PB |
734 | /* If we have no backing file yet in the destination, we cannot let |
735 | * the destination do COW. Instead, we copy sectors around the | |
736 | * dirty data if needed. We need a bitmap to do that. | |
737 | */ | |
e253f4b8 | 738 | bdrv_get_backing_filename(target_bs, backing_filename, |
b812f671 | 739 | sizeof(backing_filename)); |
e253f4b8 | 740 | if (!bdrv_get_info(target_bs, &bdi) && bdi.cluster_size) { |
e5b43573 FZ |
741 | target_cluster_size = bdi.cluster_size; |
742 | } | |
e253f4b8 | 743 | if (backing_filename[0] && !target_bs->backing |
e5b43573 FZ |
744 | && s->granularity < target_cluster_size) { |
745 | s->buf_size = MAX(s->buf_size, target_cluster_size); | |
746 | s->cow_bitmap = bitmap_new(length); | |
b812f671 | 747 | } |
e5b43573 | 748 | s->target_cluster_sectors = target_cluster_size >> BDRV_SECTOR_BITS; |
e253f4b8 | 749 | s->max_iov = MIN(bs->bl.max_iov, target_bs->bl.max_iov); |
b812f671 | 750 | |
7504edf4 KW |
751 | s->buf = qemu_try_blockalign(bs, s->buf_size); |
752 | if (s->buf == NULL) { | |
753 | ret = -ENOMEM; | |
754 | goto immediate_exit; | |
755 | } | |
756 | ||
402a4741 | 757 | mirror_free_init(s); |
893f7eba | 758 | |
49efb1f5 | 759 | s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); |
03544a6e | 760 | if (!s->is_none_mode) { |
c0b363ad DL |
761 | ret = mirror_dirty_init(s); |
762 | if (ret < 0 || block_job_is_cancelled(&s->common)) { | |
763 | goto immediate_exit; | |
893f7eba PB |
764 | } |
765 | } | |
766 | ||
dc162c8e FZ |
767 | assert(!s->dbi); |
768 | s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap, 0); | |
893f7eba | 769 | for (;;) { |
cc8c9d6c | 770 | uint64_t delay_ns = 0; |
49efb1f5 | 771 | int64_t cnt, delta; |
893f7eba PB |
772 | bool should_complete; |
773 | ||
bd48bde8 PB |
774 | if (s->ret < 0) { |
775 | ret = s->ret; | |
776 | goto immediate_exit; | |
777 | } | |
778 | ||
565ac01f SH |
779 | block_job_pause_point(&s->common); |
780 | ||
20dca810 | 781 | cnt = bdrv_get_dirty_count(s->dirty_bitmap); |
b21c7652 HR |
782 | /* s->common.offset contains the number of bytes already processed so |
783 | * far, cnt is the number of dirty sectors remaining and | |
784 | * s->sectors_in_flight is the number of sectors currently being | |
785 | * processed; together those are the current total operation length */ | |
786 | s->common.len = s->common.offset + | |
787 | (cnt + s->sectors_in_flight) * BDRV_SECTOR_SIZE; | |
bd48bde8 PB |
788 | |
789 | /* Note that even when no rate limit is applied we need to yield | |
a7282330 | 790 | * periodically with no pending I/O so that bdrv_drain_all() returns. |
bd48bde8 PB |
791 | * We do so every SLICE_TIME nanoseconds, or when there is an error, |
792 | * or when the source is clean, whichever comes first. | |
793 | */ | |
49efb1f5 DL |
794 | delta = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->last_pause_ns; |
795 | if (delta < SLICE_TIME && | |
bd48bde8 | 796 | s->common.iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
cf56a3c6 | 797 | if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 || |
402a4741 PB |
798 | (cnt == 0 && s->in_flight > 0)) { |
799 | trace_mirror_yield(s, s->in_flight, s->buf_free_count, cnt); | |
21cd917f | 800 | mirror_wait_for_io(s); |
bd48bde8 PB |
801 | continue; |
802 | } else if (cnt != 0) { | |
cc8c9d6c | 803 | delay_ns = mirror_iteration(s); |
893f7eba | 804 | } |
893f7eba PB |
805 | } |
806 | ||
807 | should_complete = false; | |
bd48bde8 | 808 | if (s->in_flight == 0 && cnt == 0) { |
893f7eba | 809 | trace_mirror_before_flush(s); |
bdffb31d PB |
810 | if (!s->synced) { |
811 | if (mirror_flush(s) < 0) { | |
812 | /* Go check s->ret. */ | |
813 | continue; | |
b952b558 | 814 | } |
b952b558 PB |
815 | /* We're out of the streaming phase. From now on, if the job |
816 | * is cancelled we will actually complete all pending I/O and | |
817 | * report completion. This way, block-job-cancel will leave | |
818 | * the target in a consistent state. | |
819 | */ | |
bdffb31d PB |
820 | block_job_event_ready(&s->common); |
821 | s->synced = true; | |
d63ffd87 | 822 | } |
bdffb31d PB |
823 | |
824 | should_complete = s->should_complete || | |
825 | block_job_is_cancelled(&s->common); | |
826 | cnt = bdrv_get_dirty_count(s->dirty_bitmap); | |
893f7eba PB |
827 | } |
828 | ||
829 | if (cnt == 0 && should_complete) { | |
830 | /* The dirty bitmap is not updated while operations are pending. | |
831 | * If we're about to exit, wait for pending operations before | |
832 | * calling bdrv_get_dirty_count(bs), or we may exit while the | |
833 | * source has dirty data to copy! | |
834 | * | |
835 | * Note that I/O can be submitted by the guest while | |
9a0cec66 PB |
836 | * mirror_populate runs, so pause it now. Before deciding |
837 | * whether to switch to target check one last time if I/O has | |
838 | * come in the meanwhile, and if not flush the data to disk. | |
893f7eba PB |
839 | */ |
840 | trace_mirror_before_drain(s, cnt); | |
9a0cec66 PB |
841 | |
842 | bdrv_drained_begin(bs); | |
20dca810 | 843 | cnt = bdrv_get_dirty_count(s->dirty_bitmap); |
bdffb31d | 844 | if (cnt > 0 || mirror_flush(s) < 0) { |
9a0cec66 PB |
845 | bdrv_drained_end(bs); |
846 | continue; | |
847 | } | |
848 | ||
849 | /* The two disks are in sync. Exit and report successful | |
850 | * completion. | |
851 | */ | |
852 | assert(QLIST_EMPTY(&bs->tracked_requests)); | |
853 | s->common.cancelled = false; | |
854 | need_drain = false; | |
855 | break; | |
893f7eba PB |
856 | } |
857 | ||
858 | ret = 0; | |
cc8c9d6c | 859 | trace_mirror_before_sleep(s, cnt, s->synced, delay_ns); |
d63ffd87 | 860 | if (!s->synced) { |
7483d1e5 | 861 | block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); |
893f7eba PB |
862 | if (block_job_is_cancelled(&s->common)) { |
863 | break; | |
864 | } | |
865 | } else if (!should_complete) { | |
bd48bde8 | 866 | delay_ns = (s->in_flight == 0 && cnt == 0 ? SLICE_TIME : 0); |
7483d1e5 | 867 | block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); |
893f7eba | 868 | } |
49efb1f5 | 869 | s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); |
893f7eba PB |
870 | } |
871 | ||
872 | immediate_exit: | |
bd48bde8 PB |
873 | if (s->in_flight > 0) { |
874 | /* We get here only if something went wrong. Either the job failed, | |
875 | * or it was cancelled prematurely so that we do not guarantee that | |
876 | * the target is a copy of the source. | |
877 | */ | |
878 | assert(ret < 0 || (!s->synced && block_job_is_cancelled(&s->common))); | |
9a0cec66 | 879 | assert(need_drain); |
bae8196d | 880 | mirror_wait_for_all_io(s); |
bd48bde8 PB |
881 | } |
882 | ||
883 | assert(s->in_flight == 0); | |
7191bf31 | 884 | qemu_vfree(s->buf); |
b812f671 | 885 | g_free(s->cow_bitmap); |
402a4741 | 886 | g_free(s->in_flight_bitmap); |
dc162c8e | 887 | bdrv_dirty_iter_free(s->dbi); |
e4654d2d | 888 | bdrv_release_dirty_bitmap(bs, s->dirty_bitmap); |
5a7e7a0b SH |
889 | |
890 | data = g_malloc(sizeof(*data)); | |
891 | data->ret = ret; | |
9a0cec66 PB |
892 | |
893 | if (need_drain) { | |
894 | bdrv_drained_begin(bs); | |
895 | } | |
5a7e7a0b | 896 | block_job_defer_to_main_loop(&s->common, mirror_exit, data); |
893f7eba PB |
897 | } |
898 | ||
899 | static void mirror_set_speed(BlockJob *job, int64_t speed, Error **errp) | |
900 | { | |
901 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
902 | ||
903 | if (speed < 0) { | |
c6bd8c70 | 904 | error_setg(errp, QERR_INVALID_PARAMETER, "speed"); |
893f7eba PB |
905 | return; |
906 | } | |
907 | ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME); | |
908 | } | |
909 | ||
d63ffd87 PB |
910 | static void mirror_complete(BlockJob *job, Error **errp) |
911 | { | |
912 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
4ef85a9c | 913 | BlockDriverState *target; |
274fccee | 914 | |
274fccee | 915 | target = blk_bs(s->target); |
d63ffd87 | 916 | |
d63ffd87 | 917 | if (!s->synced) { |
9df229c3 AG |
918 | error_setg(errp, "The active block job '%s' cannot be completed", |
919 | job->id); | |
d63ffd87 PB |
920 | return; |
921 | } | |
922 | ||
274fccee HR |
923 | if (s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) { |
924 | int ret; | |
925 | ||
926 | assert(!target->backing); | |
927 | ret = bdrv_open_backing_file(target, NULL, "backing", errp); | |
928 | if (ret < 0) { | |
929 | return; | |
930 | } | |
931 | } | |
932 | ||
15d67298 | 933 | /* block all operations on to_replace bs */ |
09158f00 | 934 | if (s->replaces) { |
5a7e7a0b SH |
935 | AioContext *replace_aio_context; |
936 | ||
e12f3784 | 937 | s->to_replace = bdrv_find_node(s->replaces); |
09158f00 | 938 | if (!s->to_replace) { |
e12f3784 | 939 | error_setg(errp, "Node name '%s' not found", s->replaces); |
09158f00 BC |
940 | return; |
941 | } | |
942 | ||
5a7e7a0b SH |
943 | replace_aio_context = bdrv_get_aio_context(s->to_replace); |
944 | aio_context_acquire(replace_aio_context); | |
945 | ||
4ef85a9c KW |
946 | /* TODO Translate this into permission system. Current definition of |
947 | * GRAPH_MOD would require to request it for the parents; they might | |
948 | * not even be BlockDriverStates, however, so a BdrvChild can't address | |
949 | * them. May need redefinition of GRAPH_MOD. */ | |
09158f00 BC |
950 | error_setg(&s->replace_blocker, |
951 | "block device is in use by block-job-complete"); | |
952 | bdrv_op_block_all(s->to_replace, s->replace_blocker); | |
953 | bdrv_ref(s->to_replace); | |
5a7e7a0b SH |
954 | |
955 | aio_context_release(replace_aio_context); | |
09158f00 BC |
956 | } |
957 | ||
d63ffd87 | 958 | s->should_complete = true; |
751ebd76 | 959 | block_job_enter(&s->common); |
d63ffd87 PB |
960 | } |
961 | ||
bae8196d | 962 | static void mirror_pause(BlockJob *job) |
565ac01f SH |
963 | { |
964 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
965 | ||
bae8196d | 966 | mirror_wait_for_all_io(s); |
565ac01f SH |
967 | } |
968 | ||
969 | static void mirror_attached_aio_context(BlockJob *job, AioContext *new_context) | |
970 | { | |
971 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
972 | ||
973 | blk_set_aio_context(s->target, new_context); | |
974 | } | |
975 | ||
bae8196d PB |
976 | static void mirror_drain(BlockJob *job) |
977 | { | |
978 | MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); | |
979 | ||
980 | /* Need to keep a reference in case blk_drain triggers execution | |
981 | * of mirror_complete... | |
982 | */ | |
983 | if (s->target) { | |
984 | BlockBackend *target = s->target; | |
985 | blk_ref(target); | |
986 | blk_drain(target); | |
987 | blk_unref(target); | |
988 | } | |
989 | } | |
990 | ||
3fc4b10a | 991 | static const BlockJobDriver mirror_job_driver = { |
565ac01f SH |
992 | .instance_size = sizeof(MirrorBlockJob), |
993 | .job_type = BLOCK_JOB_TYPE_MIRROR, | |
994 | .set_speed = mirror_set_speed, | |
a7815a76 | 995 | .start = mirror_run, |
565ac01f SH |
996 | .complete = mirror_complete, |
997 | .pause = mirror_pause, | |
998 | .attached_aio_context = mirror_attached_aio_context, | |
bae8196d | 999 | .drain = mirror_drain, |
893f7eba PB |
1000 | }; |
1001 | ||
03544a6e | 1002 | static const BlockJobDriver commit_active_job_driver = { |
565ac01f SH |
1003 | .instance_size = sizeof(MirrorBlockJob), |
1004 | .job_type = BLOCK_JOB_TYPE_COMMIT, | |
1005 | .set_speed = mirror_set_speed, | |
a7815a76 | 1006 | .start = mirror_run, |
565ac01f SH |
1007 | .complete = mirror_complete, |
1008 | .pause = mirror_pause, | |
1009 | .attached_aio_context = mirror_attached_aio_context, | |
bae8196d | 1010 | .drain = mirror_drain, |
03544a6e FZ |
1011 | }; |
1012 | ||
4ef85a9c KW |
1013 | static int coroutine_fn bdrv_mirror_top_preadv(BlockDriverState *bs, |
1014 | uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags) | |
1015 | { | |
1016 | return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags); | |
1017 | } | |
1018 | ||
1019 | static int coroutine_fn bdrv_mirror_top_pwritev(BlockDriverState *bs, | |
1020 | uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags) | |
1021 | { | |
1022 | return bdrv_co_pwritev(bs->backing, offset, bytes, qiov, flags); | |
1023 | } | |
1024 | ||
1025 | static int coroutine_fn bdrv_mirror_top_flush(BlockDriverState *bs) | |
1026 | { | |
1027 | return bdrv_co_flush(bs->backing->bs); | |
1028 | } | |
1029 | ||
1030 | static int64_t coroutine_fn bdrv_mirror_top_get_block_status( | |
1031 | BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum, | |
1032 | BlockDriverState **file) | |
1033 | { | |
1034 | *pnum = nb_sectors; | |
1035 | *file = bs->backing->bs; | |
1036 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA | | |
1037 | (sector_num << BDRV_SECTOR_BITS); | |
1038 | } | |
1039 | ||
1040 | static int coroutine_fn bdrv_mirror_top_pwrite_zeroes(BlockDriverState *bs, | |
1041 | int64_t offset, int count, BdrvRequestFlags flags) | |
1042 | { | |
1043 | return bdrv_co_pwrite_zeroes(bs->backing, offset, count, flags); | |
1044 | } | |
1045 | ||
1046 | static int coroutine_fn bdrv_mirror_top_pdiscard(BlockDriverState *bs, | |
1047 | int64_t offset, int count) | |
1048 | { | |
1049 | return bdrv_co_pdiscard(bs->backing->bs, offset, count); | |
1050 | } | |
1051 | ||
1052 | static void bdrv_mirror_top_close(BlockDriverState *bs) | |
1053 | { | |
1054 | } | |
1055 | ||
1056 | static void bdrv_mirror_top_child_perm(BlockDriverState *bs, BdrvChild *c, | |
1057 | const BdrvChildRole *role, | |
1058 | uint64_t perm, uint64_t shared, | |
1059 | uint64_t *nperm, uint64_t *nshared) | |
1060 | { | |
1061 | /* Must be able to forward guest writes to the real image */ | |
1062 | *nperm = 0; | |
1063 | if (perm & BLK_PERM_WRITE) { | |
1064 | *nperm |= BLK_PERM_WRITE; | |
1065 | } | |
1066 | ||
1067 | *nshared = BLK_PERM_ALL; | |
1068 | } | |
1069 | ||
1070 | /* Dummy node that provides consistent read to its users without requiring it | |
1071 | * from its backing file and that allows writes on the backing file chain. */ | |
1072 | static BlockDriver bdrv_mirror_top = { | |
1073 | .format_name = "mirror_top", | |
1074 | .bdrv_co_preadv = bdrv_mirror_top_preadv, | |
1075 | .bdrv_co_pwritev = bdrv_mirror_top_pwritev, | |
1076 | .bdrv_co_pwrite_zeroes = bdrv_mirror_top_pwrite_zeroes, | |
1077 | .bdrv_co_pdiscard = bdrv_mirror_top_pdiscard, | |
1078 | .bdrv_co_flush = bdrv_mirror_top_flush, | |
1079 | .bdrv_co_get_block_status = bdrv_mirror_top_get_block_status, | |
1080 | .bdrv_close = bdrv_mirror_top_close, | |
1081 | .bdrv_child_perm = bdrv_mirror_top_child_perm, | |
1082 | }; | |
1083 | ||
71aa9867 | 1084 | static void mirror_start_job(const char *job_id, BlockDriverState *bs, |
47970dfb JS |
1085 | int creation_flags, BlockDriverState *target, |
1086 | const char *replaces, int64_t speed, | |
1087 | uint32_t granularity, int64_t buf_size, | |
274fccee | 1088 | BlockMirrorBackingMode backing_mode, |
09158f00 BC |
1089 | BlockdevOnError on_source_error, |
1090 | BlockdevOnError on_target_error, | |
0fc9f8ea | 1091 | bool unmap, |
097310b5 | 1092 | BlockCompletionFunc *cb, |
09158f00 BC |
1093 | void *opaque, Error **errp, |
1094 | const BlockJobDriver *driver, | |
b49f7ead | 1095 | bool is_none_mode, BlockDriverState *base, |
6cdbceb1 | 1096 | bool auto_complete, const char *filter_node_name) |
893f7eba PB |
1097 | { |
1098 | MirrorBlockJob *s; | |
4ef85a9c KW |
1099 | BlockDriverState *mirror_top_bs; |
1100 | bool target_graph_mod; | |
1101 | bool target_is_backing; | |
b2c2832c | 1102 | Error *local_err = NULL; |
d7086422 | 1103 | int ret; |
893f7eba | 1104 | |
eee13dfe | 1105 | if (granularity == 0) { |
341ebc2f | 1106 | granularity = bdrv_get_default_bitmap_granularity(target); |
eee13dfe PB |
1107 | } |
1108 | ||
1109 | assert ((granularity & (granularity - 1)) == 0); | |
1110 | ||
48ac0a4d WC |
1111 | if (buf_size < 0) { |
1112 | error_setg(errp, "Invalid parameter 'buf-size'"); | |
1113 | return; | |
1114 | } | |
1115 | ||
1116 | if (buf_size == 0) { | |
1117 | buf_size = DEFAULT_MIRROR_BUF_SIZE; | |
1118 | } | |
5bc361b8 | 1119 | |
4ef85a9c KW |
1120 | /* In the case of active commit, add dummy driver to provide consistent |
1121 | * reads on the top, while disabling it in the intermediate nodes, and make | |
1122 | * the backing chain writable. */ | |
6cdbceb1 KW |
1123 | mirror_top_bs = bdrv_new_open_driver(&bdrv_mirror_top, filter_node_name, |
1124 | BDRV_O_RDWR, errp); | |
4ef85a9c KW |
1125 | if (mirror_top_bs == NULL) { |
1126 | return; | |
1127 | } | |
1128 | mirror_top_bs->total_sectors = bs->total_sectors; | |
1129 | ||
1130 | /* bdrv_append takes ownership of the mirror_top_bs reference, need to keep | |
1131 | * it alive until block_job_create() even if bs has no parent. */ | |
1132 | bdrv_ref(mirror_top_bs); | |
1133 | bdrv_drained_begin(bs); | |
b2c2832c | 1134 | bdrv_append(mirror_top_bs, bs, &local_err); |
4ef85a9c KW |
1135 | bdrv_drained_end(bs); |
1136 | ||
b2c2832c KW |
1137 | if (local_err) { |
1138 | bdrv_unref(mirror_top_bs); | |
1139 | error_propagate(errp, local_err); | |
1140 | return; | |
1141 | } | |
1142 | ||
4ef85a9c KW |
1143 | /* Make sure that the source is not resized while the job is running */ |
1144 | s = block_job_create(job_id, driver, mirror_top_bs, | |
1145 | BLK_PERM_CONSISTENT_READ, | |
1146 | BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED | | |
1147 | BLK_PERM_WRITE | BLK_PERM_GRAPH_MOD, speed, | |
c6cc12bf | 1148 | creation_flags, cb, opaque, errp); |
4ef85a9c | 1149 | bdrv_unref(mirror_top_bs); |
893f7eba | 1150 | if (!s) { |
4ef85a9c | 1151 | goto fail; |
893f7eba | 1152 | } |
4ef85a9c KW |
1153 | s->source = bs; |
1154 | s->mirror_top_bs = mirror_top_bs; | |
1155 | ||
1156 | /* No resize for the target either; while the mirror is still running, a | |
1157 | * consistent read isn't necessarily possible. We could possibly allow | |
1158 | * writes and graph modifications, though it would likely defeat the | |
1159 | * purpose of a mirror, so leave them blocked for now. | |
1160 | * | |
1161 | * In the case of active commit, things look a bit different, though, | |
1162 | * because the target is an already populated backing file in active use. | |
1163 | * We can allow anything except resize there.*/ | |
1164 | target_is_backing = bdrv_chain_contains(bs, target); | |
1165 | target_graph_mod = (backing_mode != MIRROR_LEAVE_BACKING_CHAIN); | |
1166 | s->target = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE | | |
1167 | (target_graph_mod ? BLK_PERM_GRAPH_MOD : 0), | |
1168 | BLK_PERM_WRITE_UNCHANGED | | |
1169 | (target_is_backing ? BLK_PERM_CONSISTENT_READ | | |
1170 | BLK_PERM_WRITE | | |
1171 | BLK_PERM_GRAPH_MOD : 0)); | |
d7086422 KW |
1172 | ret = blk_insert_bs(s->target, target, errp); |
1173 | if (ret < 0) { | |
4ef85a9c | 1174 | goto fail; |
d7086422 | 1175 | } |
e253f4b8 | 1176 | |
09158f00 | 1177 | s->replaces = g_strdup(replaces); |
b952b558 PB |
1178 | s->on_source_error = on_source_error; |
1179 | s->on_target_error = on_target_error; | |
03544a6e | 1180 | s->is_none_mode = is_none_mode; |
274fccee | 1181 | s->backing_mode = backing_mode; |
5bc361b8 | 1182 | s->base = base; |
eee13dfe | 1183 | s->granularity = granularity; |
48ac0a4d | 1184 | s->buf_size = ROUND_UP(buf_size, granularity); |
0fc9f8ea | 1185 | s->unmap = unmap; |
b49f7ead WC |
1186 | if (auto_complete) { |
1187 | s->should_complete = true; | |
1188 | } | |
b812f671 | 1189 | |
0db6e54a | 1190 | s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); |
b8afb520 | 1191 | if (!s->dirty_bitmap) { |
97031164 | 1192 | g_free(s->replaces); |
e253f4b8 | 1193 | blk_unref(s->target); |
18930ba3 | 1194 | block_job_unref(&s->common); |
b8afb520 FZ |
1195 | return; |
1196 | } | |
10f3cd15 | 1197 | |
4ef85a9c | 1198 | /* Required permissions are already taken with blk_new() */ |
76d554e2 KW |
1199 | block_job_add_bdrv(&s->common, "target", target, 0, BLK_PERM_ALL, |
1200 | &error_abort); | |
1201 | ||
f3ede4b0 AG |
1202 | /* In commit_active_start() all intermediate nodes disappear, so |
1203 | * any jobs in them must be blocked */ | |
4ef85a9c | 1204 | if (target_is_backing) { |
f3ede4b0 AG |
1205 | BlockDriverState *iter; |
1206 | for (iter = backing_bs(bs); iter != target; iter = backing_bs(iter)) { | |
4ef85a9c KW |
1207 | /* XXX BLK_PERM_WRITE needs to be allowed so we don't block |
1208 | * ourselves at s->base (if writes are blocked for a node, they are | |
1209 | * also blocked for its backing file). The other options would be a | |
1210 | * second filter driver above s->base (== target). */ | |
1211 | ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0, | |
1212 | BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE, | |
1213 | errp); | |
1214 | if (ret < 0) { | |
1215 | goto fail; | |
1216 | } | |
f3ede4b0 AG |
1217 | } |
1218 | } | |
10f3cd15 | 1219 | |
5ccac6f1 JS |
1220 | trace_mirror_start(bs, s, opaque); |
1221 | block_job_start(&s->common); | |
4ef85a9c KW |
1222 | return; |
1223 | ||
1224 | fail: | |
1225 | if (s) { | |
1226 | g_free(s->replaces); | |
1227 | blk_unref(s->target); | |
1228 | block_job_unref(&s->common); | |
1229 | } | |
1230 | ||
1231 | bdrv_replace_in_backing_chain(mirror_top_bs, backing_bs(mirror_top_bs)); | |
893f7eba | 1232 | } |
03544a6e | 1233 | |
71aa9867 AG |
1234 | void mirror_start(const char *job_id, BlockDriverState *bs, |
1235 | BlockDriverState *target, const char *replaces, | |
5fba6c0e | 1236 | int64_t speed, uint32_t granularity, int64_t buf_size, |
274fccee HR |
1237 | MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, |
1238 | BlockdevOnError on_source_error, | |
03544a6e | 1239 | BlockdevOnError on_target_error, |
6cdbceb1 | 1240 | bool unmap, const char *filter_node_name, Error **errp) |
03544a6e FZ |
1241 | { |
1242 | bool is_none_mode; | |
1243 | BlockDriverState *base; | |
1244 | ||
4b80ab2b JS |
1245 | if (mode == MIRROR_SYNC_MODE_INCREMENTAL) { |
1246 | error_setg(errp, "Sync mode 'incremental' not supported"); | |
d58d8453 JS |
1247 | return; |
1248 | } | |
03544a6e | 1249 | is_none_mode = mode == MIRROR_SYNC_MODE_NONE; |
760e0063 | 1250 | base = mode == MIRROR_SYNC_MODE_TOP ? backing_bs(bs) : NULL; |
47970dfb | 1251 | mirror_start_job(job_id, bs, BLOCK_JOB_DEFAULT, target, replaces, |
274fccee | 1252 | speed, granularity, buf_size, backing_mode, |
8254b6d9 | 1253 | on_source_error, on_target_error, unmap, NULL, NULL, errp, |
6cdbceb1 KW |
1254 | &mirror_job_driver, is_none_mode, base, false, |
1255 | filter_node_name); | |
03544a6e FZ |
1256 | } |
1257 | ||
fd62c609 | 1258 | void commit_active_start(const char *job_id, BlockDriverState *bs, |
47970dfb JS |
1259 | BlockDriverState *base, int creation_flags, |
1260 | int64_t speed, BlockdevOnError on_error, | |
0db832f4 | 1261 | const char *filter_node_name, |
47970dfb | 1262 | BlockCompletionFunc *cb, void *opaque, Error **errp, |
b49f7ead | 1263 | bool auto_complete) |
03544a6e | 1264 | { |
4da83585 | 1265 | int orig_base_flags; |
cc67f4d1 | 1266 | Error *local_err = NULL; |
4da83585 JC |
1267 | |
1268 | orig_base_flags = bdrv_get_flags(base); | |
1269 | ||
20a63d2c FZ |
1270 | if (bdrv_reopen(base, bs->open_flags, errp)) { |
1271 | return; | |
1272 | } | |
4da83585 | 1273 | |
47970dfb | 1274 | mirror_start_job(job_id, bs, creation_flags, base, NULL, speed, 0, 0, |
71aa9867 | 1275 | MIRROR_LEAVE_BACKING_CHAIN, |
6f13acf9 | 1276 | on_error, on_error, true, cb, opaque, &local_err, |
6cdbceb1 | 1277 | &commit_active_job_driver, false, base, auto_complete, |
0db832f4 | 1278 | filter_node_name); |
0fb6395c | 1279 | if (local_err) { |
cc67f4d1 | 1280 | error_propagate(errp, local_err); |
4da83585 JC |
1281 | goto error_restore_flags; |
1282 | } | |
1283 | ||
1284 | return; | |
1285 | ||
1286 | error_restore_flags: | |
1287 | /* ignore error and errp for bdrv_reopen, because we want to propagate | |
1288 | * the original error */ | |
1289 | bdrv_reopen(base, orig_base_flags, NULL); | |
1290 | return; | |
03544a6e | 1291 | } |