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fd66dbd4 SH |
1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
2 | /* | |
3 | * libblkio BlockDriver | |
4 | * | |
5 | * Copyright Red Hat, Inc. | |
6 | * | |
7 | * Author: | |
8 | * Stefan Hajnoczi <stefanha@redhat.com> | |
9 | */ | |
10 | ||
11 | #include "qemu/osdep.h" | |
12 | #include <blkio.h> | |
13 | #include "block/block_int.h" | |
c5640b3e SH |
14 | #include "exec/memory.h" |
15 | #include "exec/cpu-common.h" /* for qemu_ram_get_fd() */ | |
433fcea4 | 16 | #include "qemu/defer-call.h" |
fd66dbd4 | 17 | #include "qapi/error.h" |
c5640b3e | 18 | #include "qemu/error-report.h" |
fd66dbd4 SH |
19 | #include "qapi/qmp/qdict.h" |
20 | #include "qemu/module.h" | |
28ff7b4d | 21 | #include "sysemu/block-backend.h" |
c5640b3e | 22 | #include "exec/memory.h" /* for ram_block_discard_disable() */ |
fd66dbd4 | 23 | |
4f01a9bb PK |
24 | #include "block/block-io.h" |
25 | ||
fd66dbd4 SH |
26 | /* |
27 | * Allocated bounce buffers are kept in a list sorted by buffer address. | |
28 | */ | |
29 | typedef struct BlkioBounceBuf { | |
30 | QLIST_ENTRY(BlkioBounceBuf) next; | |
31 | ||
32 | /* The bounce buffer */ | |
33 | struct iovec buf; | |
34 | } BlkioBounceBuf; | |
35 | ||
36 | typedef struct { | |
37 | /* | |
38 | * libblkio is not thread-safe so this lock protects ->blkio and | |
39 | * ->blkioq. | |
40 | */ | |
41 | QemuMutex blkio_lock; | |
42 | struct blkio *blkio; | |
43 | struct blkioq *blkioq; /* make this multi-queue in the future... */ | |
44 | int completion_fd; | |
45 | ||
46 | /* | |
47 | * Polling fetches the next completion into this field. | |
48 | * | |
49 | * No lock is necessary since only one thread calls aio_poll() and invokes | |
50 | * fd and poll handlers. | |
51 | */ | |
52 | struct blkio_completion poll_completion; | |
53 | ||
54 | /* | |
55 | * Protects ->bounce_pool, ->bounce_bufs, ->bounce_available. | |
56 | * | |
57 | * Lock ordering: ->bounce_lock before ->blkio_lock. | |
58 | */ | |
59 | CoMutex bounce_lock; | |
60 | ||
61 | /* Bounce buffer pool */ | |
62 | struct blkio_mem_region bounce_pool; | |
63 | ||
64 | /* Sorted list of allocated bounce buffers */ | |
65 | QLIST_HEAD(, BlkioBounceBuf) bounce_bufs; | |
66 | ||
67 | /* Queue for coroutines waiting for bounce buffer space */ | |
68 | CoQueue bounce_available; | |
69 | ||
70 | /* The value of the "mem-region-alignment" property */ | |
71 | size_t mem_region_alignment; | |
72 | ||
73 | /* Can we skip adding/deleting blkio_mem_regions? */ | |
74 | bool needs_mem_regions; | |
c5640b3e SH |
75 | |
76 | /* Are file descriptors necessary for blkio_mem_regions? */ | |
77 | bool needs_mem_region_fd; | |
78 | ||
79 | /* Are madvise(MADV_DONTNEED)-style operations unavailable? */ | |
80 | bool may_pin_mem_regions; | |
fd66dbd4 SH |
81 | } BDRVBlkioState; |
82 | ||
83 | /* Called with s->bounce_lock held */ | |
84 | static int blkio_resize_bounce_pool(BDRVBlkioState *s, int64_t bytes) | |
85 | { | |
86 | /* There can be no allocated bounce buffers during resize */ | |
87 | assert(QLIST_EMPTY(&s->bounce_bufs)); | |
88 | ||
89 | /* Pad size to reduce frequency of resize calls */ | |
90 | bytes += 128 * 1024; | |
91 | ||
92 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
93 | int ret; | |
94 | ||
95 | if (s->bounce_pool.addr) { | |
96 | blkio_unmap_mem_region(s->blkio, &s->bounce_pool); | |
97 | blkio_free_mem_region(s->blkio, &s->bounce_pool); | |
98 | memset(&s->bounce_pool, 0, sizeof(s->bounce_pool)); | |
99 | } | |
100 | ||
101 | /* Automatically freed when s->blkio is destroyed */ | |
102 | ret = blkio_alloc_mem_region(s->blkio, &s->bounce_pool, bytes); | |
103 | if (ret < 0) { | |
104 | return ret; | |
105 | } | |
106 | ||
107 | ret = blkio_map_mem_region(s->blkio, &s->bounce_pool); | |
108 | if (ret < 0) { | |
109 | blkio_free_mem_region(s->blkio, &s->bounce_pool); | |
110 | memset(&s->bounce_pool, 0, sizeof(s->bounce_pool)); | |
111 | return ret; | |
112 | } | |
113 | } | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | /* Called with s->bounce_lock held */ | |
119 | static bool | |
120 | blkio_do_alloc_bounce_buffer(BDRVBlkioState *s, BlkioBounceBuf *bounce, | |
121 | int64_t bytes) | |
122 | { | |
123 | void *addr = s->bounce_pool.addr; | |
124 | BlkioBounceBuf *cur = NULL; | |
125 | BlkioBounceBuf *prev = NULL; | |
126 | ptrdiff_t space; | |
127 | ||
128 | /* | |
129 | * This is just a linear search over the holes between requests. An | |
130 | * efficient allocator would be nice. | |
131 | */ | |
132 | QLIST_FOREACH(cur, &s->bounce_bufs, next) { | |
133 | space = cur->buf.iov_base - addr; | |
134 | if (bytes <= space) { | |
135 | QLIST_INSERT_BEFORE(cur, bounce, next); | |
136 | bounce->buf.iov_base = addr; | |
137 | bounce->buf.iov_len = bytes; | |
138 | return true; | |
139 | } | |
140 | ||
141 | addr = cur->buf.iov_base + cur->buf.iov_len; | |
142 | prev = cur; | |
143 | } | |
144 | ||
145 | /* Is there space after the last request? */ | |
146 | space = s->bounce_pool.addr + s->bounce_pool.len - addr; | |
147 | if (bytes > space) { | |
148 | return false; | |
149 | } | |
150 | if (prev) { | |
151 | QLIST_INSERT_AFTER(prev, bounce, next); | |
152 | } else { | |
153 | QLIST_INSERT_HEAD(&s->bounce_bufs, bounce, next); | |
154 | } | |
155 | bounce->buf.iov_base = addr; | |
156 | bounce->buf.iov_len = bytes; | |
157 | return true; | |
158 | } | |
159 | ||
160 | static int coroutine_fn | |
161 | blkio_alloc_bounce_buffer(BDRVBlkioState *s, BlkioBounceBuf *bounce, | |
162 | int64_t bytes) | |
163 | { | |
164 | /* | |
165 | * Ensure fairness: first time around we join the back of the queue, | |
166 | * subsequently we join the front so we don't lose our place. | |
167 | */ | |
168 | CoQueueWaitFlags wait_flags = 0; | |
169 | ||
170 | QEMU_LOCK_GUARD(&s->bounce_lock); | |
171 | ||
172 | /* Ensure fairness: don't even try if other requests are already waiting */ | |
173 | if (!qemu_co_queue_empty(&s->bounce_available)) { | |
174 | qemu_co_queue_wait_flags(&s->bounce_available, &s->bounce_lock, | |
175 | wait_flags); | |
176 | wait_flags = CO_QUEUE_WAIT_FRONT; | |
177 | } | |
178 | ||
179 | while (true) { | |
180 | if (blkio_do_alloc_bounce_buffer(s, bounce, bytes)) { | |
181 | /* Kick the next queued request since there may be space */ | |
182 | qemu_co_queue_next(&s->bounce_available); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | /* | |
187 | * If there are no in-flight requests then the pool was simply too | |
188 | * small. | |
189 | */ | |
190 | if (QLIST_EMPTY(&s->bounce_bufs)) { | |
191 | bool ok; | |
192 | int ret; | |
193 | ||
194 | ret = blkio_resize_bounce_pool(s, bytes); | |
195 | if (ret < 0) { | |
196 | /* Kick the next queued request since that may fail too */ | |
197 | qemu_co_queue_next(&s->bounce_available); | |
198 | return ret; | |
199 | } | |
200 | ||
201 | ok = blkio_do_alloc_bounce_buffer(s, bounce, bytes); | |
202 | assert(ok); /* must have space this time */ | |
203 | return 0; | |
204 | } | |
205 | ||
206 | qemu_co_queue_wait_flags(&s->bounce_available, &s->bounce_lock, | |
207 | wait_flags); | |
208 | wait_flags = CO_QUEUE_WAIT_FRONT; | |
209 | } | |
210 | } | |
211 | ||
212 | static void coroutine_fn blkio_free_bounce_buffer(BDRVBlkioState *s, | |
213 | BlkioBounceBuf *bounce) | |
214 | { | |
215 | QEMU_LOCK_GUARD(&s->bounce_lock); | |
216 | ||
217 | QLIST_REMOVE(bounce, next); | |
218 | ||
219 | /* Wake up waiting coroutines since space may now be available */ | |
220 | qemu_co_queue_next(&s->bounce_available); | |
221 | } | |
222 | ||
223 | /* For async to .bdrv_co_*() conversion */ | |
224 | typedef struct { | |
225 | Coroutine *coroutine; | |
226 | int ret; | |
227 | } BlkioCoData; | |
228 | ||
229 | static void blkio_completion_fd_read(void *opaque) | |
230 | { | |
231 | BlockDriverState *bs = opaque; | |
232 | BDRVBlkioState *s = bs->opaque; | |
233 | uint64_t val; | |
234 | int ret; | |
235 | ||
236 | /* Polling may have already fetched a completion */ | |
237 | if (s->poll_completion.user_data != NULL) { | |
238 | BlkioCoData *cod = s->poll_completion.user_data; | |
239 | cod->ret = s->poll_completion.ret; | |
240 | ||
241 | /* Clear it in case aio_co_wake() enters a nested event loop */ | |
242 | s->poll_completion.user_data = NULL; | |
243 | ||
244 | aio_co_wake(cod->coroutine); | |
245 | } | |
246 | ||
247 | /* Reset completion fd status */ | |
248 | ret = read(s->completion_fd, &val, sizeof(val)); | |
249 | ||
250 | /* Ignore errors, there's nothing we can do */ | |
251 | (void)ret; | |
252 | ||
253 | /* | |
254 | * Reading one completion at a time makes nested event loop re-entrancy | |
255 | * simple. Change this loop to get multiple completions in one go if it | |
256 | * becomes a performance bottleneck. | |
257 | */ | |
258 | while (true) { | |
259 | struct blkio_completion completion; | |
260 | ||
261 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
262 | ret = blkioq_do_io(s->blkioq, &completion, 0, 1, NULL); | |
263 | } | |
264 | if (ret != 1) { | |
265 | break; | |
266 | } | |
267 | ||
268 | BlkioCoData *cod = completion.user_data; | |
269 | cod->ret = completion.ret; | |
270 | aio_co_wake(cod->coroutine); | |
271 | } | |
272 | } | |
273 | ||
274 | static bool blkio_completion_fd_poll(void *opaque) | |
275 | { | |
276 | BlockDriverState *bs = opaque; | |
277 | BDRVBlkioState *s = bs->opaque; | |
278 | int ret; | |
279 | ||
280 | /* Just in case we already fetched a completion */ | |
281 | if (s->poll_completion.user_data != NULL) { | |
282 | return true; | |
283 | } | |
284 | ||
285 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
286 | ret = blkioq_do_io(s->blkioq, &s->poll_completion, 0, 1, NULL); | |
287 | } | |
288 | return ret == 1; | |
289 | } | |
290 | ||
291 | static void blkio_completion_fd_poll_ready(void *opaque) | |
292 | { | |
293 | blkio_completion_fd_read(opaque); | |
294 | } | |
295 | ||
296 | static void blkio_attach_aio_context(BlockDriverState *bs, | |
297 | AioContext *new_context) | |
298 | { | |
299 | BDRVBlkioState *s = bs->opaque; | |
300 | ||
60f782b6 SH |
301 | aio_set_fd_handler(new_context, s->completion_fd, |
302 | blkio_completion_fd_read, NULL, | |
fd66dbd4 | 303 | blkio_completion_fd_poll, |
60f782b6 | 304 | blkio_completion_fd_poll_ready, bs); |
fd66dbd4 SH |
305 | } |
306 | ||
307 | static void blkio_detach_aio_context(BlockDriverState *bs) | |
308 | { | |
309 | BDRVBlkioState *s = bs->opaque; | |
310 | ||
60f782b6 SH |
311 | aio_set_fd_handler(bdrv_get_aio_context(bs), s->completion_fd, NULL, NULL, |
312 | NULL, NULL, NULL); | |
fd66dbd4 SH |
313 | } |
314 | ||
28ff7b4d | 315 | /* |
ccee48aa SH |
316 | * Called by defer_call_end() or immediately if not in a deferred section. |
317 | * Called without blkio_lock. | |
28ff7b4d | 318 | */ |
ccee48aa | 319 | static void blkio_deferred_fn(void *opaque) |
fd66dbd4 | 320 | { |
28ff7b4d | 321 | BDRVBlkioState *s = opaque; |
fd66dbd4 | 322 | |
28ff7b4d | 323 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
fd66dbd4 SH |
324 | blkioq_do_io(s->blkioq, NULL, 0, 0, NULL); |
325 | } | |
326 | } | |
327 | ||
28ff7b4d SH |
328 | /* |
329 | * Schedule I/O submission after enqueuing a new request. Called without | |
330 | * blkio_lock. | |
331 | */ | |
332 | static void blkio_submit_io(BlockDriverState *bs) | |
333 | { | |
334 | BDRVBlkioState *s = bs->opaque; | |
335 | ||
ccee48aa | 336 | defer_call(blkio_deferred_fn, s); |
28ff7b4d SH |
337 | } |
338 | ||
fd66dbd4 SH |
339 | static int coroutine_fn |
340 | blkio_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) | |
341 | { | |
342 | BDRVBlkioState *s = bs->opaque; | |
343 | BlkioCoData cod = { | |
344 | .coroutine = qemu_coroutine_self(), | |
345 | }; | |
346 | ||
347 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
348 | blkioq_discard(s->blkioq, offset, bytes, &cod, 0); | |
fd66dbd4 SH |
349 | } |
350 | ||
28ff7b4d | 351 | blkio_submit_io(bs); |
fd66dbd4 SH |
352 | qemu_coroutine_yield(); |
353 | return cod.ret; | |
354 | } | |
355 | ||
356 | static int coroutine_fn | |
357 | blkio_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
358 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
359 | { | |
360 | BlkioCoData cod = { | |
361 | .coroutine = qemu_coroutine_self(), | |
362 | }; | |
363 | BDRVBlkioState *s = bs->opaque; | |
c5640b3e SH |
364 | bool use_bounce_buffer = |
365 | s->needs_mem_regions && !(flags & BDRV_REQ_REGISTERED_BUF); | |
fd66dbd4 SH |
366 | BlkioBounceBuf bounce; |
367 | struct iovec *iov = qiov->iov; | |
368 | int iovcnt = qiov->niov; | |
369 | ||
370 | if (use_bounce_buffer) { | |
371 | int ret = blkio_alloc_bounce_buffer(s, &bounce, bytes); | |
372 | if (ret < 0) { | |
373 | return ret; | |
374 | } | |
375 | ||
376 | iov = &bounce.buf; | |
377 | iovcnt = 1; | |
378 | } | |
379 | ||
380 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
381 | blkioq_readv(s->blkioq, offset, iov, iovcnt, &cod, 0); | |
fd66dbd4 SH |
382 | } |
383 | ||
28ff7b4d | 384 | blkio_submit_io(bs); |
fd66dbd4 SH |
385 | qemu_coroutine_yield(); |
386 | ||
387 | if (use_bounce_buffer) { | |
388 | if (cod.ret == 0) { | |
389 | qemu_iovec_from_buf(qiov, 0, | |
390 | bounce.buf.iov_base, | |
391 | bounce.buf.iov_len); | |
392 | } | |
393 | ||
394 | blkio_free_bounce_buffer(s, &bounce); | |
395 | } | |
396 | ||
397 | return cod.ret; | |
398 | } | |
399 | ||
400 | static int coroutine_fn blkio_co_pwritev(BlockDriverState *bs, int64_t offset, | |
401 | int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags) | |
402 | { | |
403 | uint32_t blkio_flags = (flags & BDRV_REQ_FUA) ? BLKIO_REQ_FUA : 0; | |
404 | BlkioCoData cod = { | |
405 | .coroutine = qemu_coroutine_self(), | |
406 | }; | |
407 | BDRVBlkioState *s = bs->opaque; | |
c5640b3e SH |
408 | bool use_bounce_buffer = |
409 | s->needs_mem_regions && !(flags & BDRV_REQ_REGISTERED_BUF); | |
fd66dbd4 SH |
410 | BlkioBounceBuf bounce; |
411 | struct iovec *iov = qiov->iov; | |
412 | int iovcnt = qiov->niov; | |
413 | ||
414 | if (use_bounce_buffer) { | |
415 | int ret = blkio_alloc_bounce_buffer(s, &bounce, bytes); | |
416 | if (ret < 0) { | |
417 | return ret; | |
418 | } | |
419 | ||
420 | qemu_iovec_to_buf(qiov, 0, bounce.buf.iov_base, bytes); | |
421 | iov = &bounce.buf; | |
422 | iovcnt = 1; | |
423 | } | |
424 | ||
425 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
426 | blkioq_writev(s->blkioq, offset, iov, iovcnt, &cod, blkio_flags); | |
fd66dbd4 SH |
427 | } |
428 | ||
28ff7b4d | 429 | blkio_submit_io(bs); |
fd66dbd4 SH |
430 | qemu_coroutine_yield(); |
431 | ||
432 | if (use_bounce_buffer) { | |
433 | blkio_free_bounce_buffer(s, &bounce); | |
434 | } | |
435 | ||
436 | return cod.ret; | |
437 | } | |
438 | ||
439 | static int coroutine_fn blkio_co_flush(BlockDriverState *bs) | |
440 | { | |
441 | BDRVBlkioState *s = bs->opaque; | |
442 | BlkioCoData cod = { | |
443 | .coroutine = qemu_coroutine_self(), | |
444 | }; | |
445 | ||
446 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
447 | blkioq_flush(s->blkioq, &cod, 0); | |
fd66dbd4 SH |
448 | } |
449 | ||
28ff7b4d | 450 | blkio_submit_io(bs); |
fd66dbd4 SH |
451 | qemu_coroutine_yield(); |
452 | return cod.ret; | |
453 | } | |
454 | ||
455 | static int coroutine_fn blkio_co_pwrite_zeroes(BlockDriverState *bs, | |
456 | int64_t offset, int64_t bytes, BdrvRequestFlags flags) | |
457 | { | |
458 | BDRVBlkioState *s = bs->opaque; | |
459 | BlkioCoData cod = { | |
460 | .coroutine = qemu_coroutine_self(), | |
461 | }; | |
462 | uint32_t blkio_flags = 0; | |
463 | ||
464 | if (flags & BDRV_REQ_FUA) { | |
465 | blkio_flags |= BLKIO_REQ_FUA; | |
466 | } | |
467 | if (!(flags & BDRV_REQ_MAY_UNMAP)) { | |
468 | blkio_flags |= BLKIO_REQ_NO_UNMAP; | |
469 | } | |
470 | if (flags & BDRV_REQ_NO_FALLBACK) { | |
471 | blkio_flags |= BLKIO_REQ_NO_FALLBACK; | |
472 | } | |
473 | ||
474 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
475 | blkioq_write_zeroes(s->blkioq, offset, bytes, &cod, blkio_flags); | |
fd66dbd4 SH |
476 | } |
477 | ||
28ff7b4d | 478 | blkio_submit_io(bs); |
fd66dbd4 SH |
479 | qemu_coroutine_yield(); |
480 | return cod.ret; | |
481 | } | |
482 | ||
c5640b3e SH |
483 | typedef enum { |
484 | BMRR_OK, | |
485 | BMRR_SKIP, | |
486 | BMRR_FAIL, | |
487 | } BlkioMemRegionResult; | |
488 | ||
489 | /* | |
490 | * Produce a struct blkio_mem_region for a given address and size. | |
491 | * | |
492 | * This function produces identical results when called multiple times with the | |
493 | * same arguments. This property is necessary because blkio_unmap_mem_region() | |
494 | * must receive the same struct blkio_mem_region field values that were passed | |
495 | * to blkio_map_mem_region(). | |
496 | */ | |
497 | static BlkioMemRegionResult | |
498 | blkio_mem_region_from_host(BlockDriverState *bs, | |
499 | void *host, size_t size, | |
500 | struct blkio_mem_region *region, | |
501 | Error **errp) | |
502 | { | |
503 | BDRVBlkioState *s = bs->opaque; | |
504 | int fd = -1; | |
505 | ram_addr_t fd_offset = 0; | |
506 | ||
507 | if (((uintptr_t)host | size) % s->mem_region_alignment) { | |
508 | error_setg(errp, "unaligned buf %p with size %zu", host, size); | |
509 | return BMRR_FAIL; | |
510 | } | |
511 | ||
512 | /* Attempt to find the fd for the underlying memory */ | |
513 | if (s->needs_mem_region_fd) { | |
514 | RAMBlock *ram_block; | |
515 | RAMBlock *end_block; | |
516 | ram_addr_t offset; | |
517 | ||
518 | /* | |
519 | * bdrv_register_buf() is called with the BQL held so mr lives at least | |
520 | * until this function returns. | |
521 | */ | |
522 | ram_block = qemu_ram_block_from_host(host, false, &fd_offset); | |
523 | if (ram_block) { | |
524 | fd = qemu_ram_get_fd(ram_block); | |
525 | } | |
526 | if (fd == -1) { | |
527 | /* | |
528 | * Ideally every RAMBlock would have an fd. pc-bios and other | |
529 | * things don't. Luckily they are usually not I/O buffers and we | |
530 | * can just ignore them. | |
531 | */ | |
532 | return BMRR_SKIP; | |
533 | } | |
534 | ||
535 | /* Make sure the fd covers the entire range */ | |
536 | end_block = qemu_ram_block_from_host(host + size - 1, false, &offset); | |
537 | if (ram_block != end_block) { | |
538 | error_setg(errp, "registered buffer at %p with size %zu extends " | |
539 | "beyond RAMBlock", host, size); | |
540 | return BMRR_FAIL; | |
541 | } | |
542 | } | |
543 | ||
544 | *region = (struct blkio_mem_region){ | |
545 | .addr = host, | |
546 | .len = size, | |
547 | .fd = fd, | |
548 | .fd_offset = fd_offset, | |
549 | }; | |
550 | return BMRR_OK; | |
551 | } | |
552 | ||
553 | static bool blkio_register_buf(BlockDriverState *bs, void *host, size_t size, | |
554 | Error **errp) | |
555 | { | |
556 | BDRVBlkioState *s = bs->opaque; | |
557 | struct blkio_mem_region region; | |
558 | BlkioMemRegionResult region_result; | |
559 | int ret; | |
560 | ||
561 | /* | |
562 | * Mapping memory regions conflicts with RAM discard (virtio-mem) when | |
563 | * there is pinning, so only do it when necessary. | |
564 | */ | |
565 | if (!s->needs_mem_regions && s->may_pin_mem_regions) { | |
566 | return true; | |
567 | } | |
568 | ||
569 | region_result = blkio_mem_region_from_host(bs, host, size, ®ion, errp); | |
570 | if (region_result == BMRR_SKIP) { | |
571 | return true; | |
572 | } else if (region_result != BMRR_OK) { | |
573 | return false; | |
574 | } | |
575 | ||
576 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
577 | ret = blkio_map_mem_region(s->blkio, ®ion); | |
578 | } | |
579 | ||
580 | if (ret < 0) { | |
581 | error_setg(errp, "Failed to add blkio mem region %p with size %zu: %s", | |
582 | host, size, blkio_get_error_msg()); | |
583 | return false; | |
584 | } | |
585 | return true; | |
586 | } | |
587 | ||
588 | static void blkio_unregister_buf(BlockDriverState *bs, void *host, size_t size) | |
589 | { | |
590 | BDRVBlkioState *s = bs->opaque; | |
591 | struct blkio_mem_region region; | |
592 | ||
593 | /* See blkio_register_buf() */ | |
594 | if (!s->needs_mem_regions && s->may_pin_mem_regions) { | |
595 | return; | |
596 | } | |
597 | ||
598 | if (blkio_mem_region_from_host(bs, host, size, ®ion, NULL) != BMRR_OK) { | |
599 | return; | |
600 | } | |
601 | ||
602 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
603 | blkio_unmap_mem_region(s->blkio, ®ion); | |
604 | } | |
605 | } | |
606 | ||
69785d66 SG |
607 | static int blkio_io_uring_connect(BlockDriverState *bs, QDict *options, |
608 | int flags, Error **errp) | |
fd66dbd4 SH |
609 | { |
610 | const char *filename = qdict_get_str(options, "filename"); | |
611 | BDRVBlkioState *s = bs->opaque; | |
612 | int ret; | |
613 | ||
614 | ret = blkio_set_str(s->blkio, "path", filename); | |
615 | qdict_del(options, "filename"); | |
616 | if (ret < 0) { | |
617 | error_setg_errno(errp, -ret, "failed to set path: %s", | |
618 | blkio_get_error_msg()); | |
619 | return ret; | |
620 | } | |
621 | ||
622 | if (flags & BDRV_O_NOCACHE) { | |
623 | ret = blkio_set_bool(s->blkio, "direct", true); | |
624 | if (ret < 0) { | |
625 | error_setg_errno(errp, -ret, "failed to set direct: %s", | |
626 | blkio_get_error_msg()); | |
627 | return ret; | |
628 | } | |
629 | } | |
630 | ||
69785d66 SG |
631 | ret = blkio_connect(s->blkio); |
632 | if (ret < 0) { | |
633 | error_setg_errno(errp, -ret, "blkio_connect failed: %s", | |
634 | blkio_get_error_msg()); | |
635 | return ret; | |
636 | } | |
637 | ||
fd66dbd4 SH |
638 | return 0; |
639 | } | |
640 | ||
69785d66 SG |
641 | static int blkio_nvme_io_uring_connect(BlockDriverState *bs, QDict *options, |
642 | int flags, Error **errp) | |
fd66dbd4 | 643 | { |
6c32fc0d | 644 | const char *path = qdict_get_try_str(options, "path"); |
fd66dbd4 SH |
645 | BDRVBlkioState *s = bs->opaque; |
646 | int ret; | |
647 | ||
6c32fc0d AF |
648 | if (!path) { |
649 | error_setg(errp, "missing 'path' option"); | |
650 | return -EINVAL; | |
651 | } | |
652 | ||
653 | ret = blkio_set_str(s->blkio, "path", path); | |
654 | qdict_del(options, "path"); | |
fd66dbd4 SH |
655 | if (ret < 0) { |
656 | error_setg_errno(errp, -ret, "failed to set path: %s", | |
657 | blkio_get_error_msg()); | |
658 | return ret; | |
659 | } | |
660 | ||
661 | if (!(flags & BDRV_O_NOCACHE)) { | |
662 | error_setg(errp, "cache.direct=off is not supported"); | |
663 | return -EINVAL; | |
664 | } | |
665 | ||
69785d66 SG |
666 | ret = blkio_connect(s->blkio); |
667 | if (ret < 0) { | |
668 | error_setg_errno(errp, -ret, "blkio_connect failed: %s", | |
669 | blkio_get_error_msg()); | |
670 | return ret; | |
671 | } | |
672 | ||
fd66dbd4 SH |
673 | return 0; |
674 | } | |
675 | ||
69785d66 SG |
676 | static int blkio_virtio_blk_connect(BlockDriverState *bs, QDict *options, |
677 | int flags, Error **errp) | |
fd66dbd4 SH |
678 | { |
679 | const char *path = qdict_get_try_str(options, "path"); | |
680 | BDRVBlkioState *s = bs->opaque; | |
cad2ccc3 | 681 | bool fd_supported = false; |
0b054b4c | 682 | int fd = -1, ret; |
fd66dbd4 SH |
683 | |
684 | if (!path) { | |
685 | error_setg(errp, "missing 'path' option"); | |
686 | return -EINVAL; | |
687 | } | |
688 | ||
fd66dbd4 SH |
689 | if (!(flags & BDRV_O_NOCACHE)) { |
690 | error_setg(errp, "cache.direct=off is not supported"); | |
691 | return -EINVAL; | |
692 | } | |
cad2ccc3 | 693 | |
1c38fe69 | 694 | if (blkio_set_int(s->blkio, "fd", -1) == 0) { |
cad2ccc3 SG |
695 | fd_supported = true; |
696 | } | |
697 | ||
698 | /* | |
699 | * If the libblkio driver supports fd passing, let's always use qemu_open() | |
700 | * to open the `path`, so we can handle fd passing from the management | |
701 | * layer through the "/dev/fdset/N" special path. | |
702 | */ | |
703 | if (fd_supported) { | |
a5942c17 SG |
704 | /* |
705 | * `path` can contain the path of a character device | |
706 | * (e.g. /dev/vhost-vdpa-0 or /dev/vfio/vfio) or a unix socket. | |
707 | * | |
708 | * So, we should always open it with O_RDWR flag, also if BDRV_O_RDWR | |
709 | * is not set in the open flags, because the exchange of IOCTL commands | |
710 | * for example will fail. | |
711 | * | |
712 | * In order to open the device read-only, we are using the `read-only` | |
713 | * property of the libblkio driver in blkio_file_open(). | |
714 | */ | |
723bea27 | 715 | fd = qemu_open(path, O_RDWR, NULL); |
cad2ccc3 | 716 | if (fd < 0) { |
9b06d0d0 SG |
717 | /* |
718 | * qemu_open() can fail if the user specifies a path that is not | |
719 | * a file or device, for example in the case of Unix Domain Socket | |
720 | * for the virtio-blk-vhost-user driver. In such cases let's have | |
721 | * libblkio open the path directly. | |
722 | */ | |
723bea27 SG |
723 | fd_supported = false; |
724 | } else { | |
725 | ret = blkio_set_int(s->blkio, "fd", fd); | |
726 | if (ret < 0) { | |
727 | fd_supported = false; | |
728 | qemu_close(fd); | |
0b054b4c | 729 | fd = -1; |
723bea27 | 730 | } |
cad2ccc3 | 731 | } |
723bea27 | 732 | } |
cad2ccc3 | 733 | |
723bea27 | 734 | if (!fd_supported) { |
cad2ccc3 SG |
735 | ret = blkio_set_str(s->blkio, "path", path); |
736 | if (ret < 0) { | |
737 | error_setg_errno(errp, -ret, "failed to set path: %s", | |
738 | blkio_get_error_msg()); | |
739 | return ret; | |
740 | } | |
741 | } | |
742 | ||
69785d66 | 743 | ret = blkio_connect(s->blkio); |
0b054b4c SG |
744 | if (ret < 0 && fd >= 0) { |
745 | /* Failed to give the FD to libblkio, close it */ | |
746 | qemu_close(fd); | |
747 | fd = -1; | |
748 | } | |
749 | ||
809c319f | 750 | /* |
9b06d0d0 SG |
751 | * Before https://gitlab.com/libblkio/libblkio/-/merge_requests/208 |
752 | * (libblkio <= v1.3.0), setting the `fd` property is not enough to check | |
753 | * whether the driver supports the `fd` property or not. In that case, | |
754 | * blkio_connect() will fail with -EINVAL. | |
755 | * So let's try calling blkio_connect() again by directly setting `path` | |
756 | * to cover this scenario. | |
809c319f SG |
757 | */ |
758 | if (fd_supported && ret == -EINVAL) { | |
809c319f SG |
759 | /* |
760 | * We need to clear the `fd` property we set previously by setting | |
761 | * it to -1. | |
762 | */ | |
763 | ret = blkio_set_int(s->blkio, "fd", -1); | |
764 | if (ret < 0) { | |
765 | error_setg_errno(errp, -ret, "failed to set fd: %s", | |
766 | blkio_get_error_msg()); | |
767 | return ret; | |
768 | } | |
769 | ||
770 | ret = blkio_set_str(s->blkio, "path", path); | |
771 | if (ret < 0) { | |
772 | error_setg_errno(errp, -ret, "failed to set path: %s", | |
773 | blkio_get_error_msg()); | |
774 | return ret; | |
775 | } | |
776 | ||
777 | ret = blkio_connect(s->blkio); | |
778 | } | |
779 | ||
69785d66 SG |
780 | if (ret < 0) { |
781 | error_setg_errno(errp, -ret, "blkio_connect failed: %s", | |
782 | blkio_get_error_msg()); | |
783 | return ret; | |
784 | } | |
785 | ||
cad2ccc3 SG |
786 | qdict_del(options, "path"); |
787 | ||
fd66dbd4 SH |
788 | return 0; |
789 | } | |
790 | ||
791 | static int blkio_file_open(BlockDriverState *bs, QDict *options, int flags, | |
792 | Error **errp) | |
793 | { | |
794 | const char *blkio_driver = bs->drv->protocol_name; | |
795 | BDRVBlkioState *s = bs->opaque; | |
796 | int ret; | |
797 | ||
798 | ret = blkio_create(blkio_driver, &s->blkio); | |
799 | if (ret < 0) { | |
800 | error_setg_errno(errp, -ret, "blkio_create failed: %s", | |
801 | blkio_get_error_msg()); | |
802 | return ret; | |
803 | } | |
804 | ||
fd66dbd4 SH |
805 | if (!(flags & BDRV_O_RDWR)) { |
806 | ret = blkio_set_bool(s->blkio, "read-only", true); | |
807 | if (ret < 0) { | |
808 | error_setg_errno(errp, -ret, "failed to set read-only: %s", | |
809 | blkio_get_error_msg()); | |
810 | blkio_destroy(&s->blkio); | |
811 | return ret; | |
812 | } | |
813 | } | |
814 | ||
69785d66 SG |
815 | if (strcmp(blkio_driver, "io_uring") == 0) { |
816 | ret = blkio_io_uring_connect(bs, options, flags, errp); | |
817 | } else if (strcmp(blkio_driver, "nvme-io_uring") == 0) { | |
818 | ret = blkio_nvme_io_uring_connect(bs, options, flags, errp); | |
819 | } else if (strcmp(blkio_driver, "virtio-blk-vfio-pci") == 0) { | |
820 | ret = blkio_virtio_blk_connect(bs, options, flags, errp); | |
821 | } else if (strcmp(blkio_driver, "virtio-blk-vhost-user") == 0) { | |
822 | ret = blkio_virtio_blk_connect(bs, options, flags, errp); | |
823 | } else if (strcmp(blkio_driver, "virtio-blk-vhost-vdpa") == 0) { | |
824 | ret = blkio_virtio_blk_connect(bs, options, flags, errp); | |
825 | } else { | |
826 | g_assert_not_reached(); | |
827 | } | |
fd66dbd4 | 828 | if (ret < 0) { |
fd66dbd4 SH |
829 | blkio_destroy(&s->blkio); |
830 | return ret; | |
831 | } | |
832 | ||
833 | ret = blkio_get_bool(s->blkio, | |
834 | "needs-mem-regions", | |
835 | &s->needs_mem_regions); | |
836 | if (ret < 0) { | |
837 | error_setg_errno(errp, -ret, | |
838 | "failed to get needs-mem-regions: %s", | |
839 | blkio_get_error_msg()); | |
840 | blkio_destroy(&s->blkio); | |
841 | return ret; | |
842 | } | |
843 | ||
c5640b3e SH |
844 | ret = blkio_get_bool(s->blkio, |
845 | "needs-mem-region-fd", | |
846 | &s->needs_mem_region_fd); | |
847 | if (ret < 0) { | |
848 | error_setg_errno(errp, -ret, | |
849 | "failed to get needs-mem-region-fd: %s", | |
850 | blkio_get_error_msg()); | |
851 | blkio_destroy(&s->blkio); | |
852 | return ret; | |
853 | } | |
854 | ||
fd66dbd4 SH |
855 | ret = blkio_get_uint64(s->blkio, |
856 | "mem-region-alignment", | |
857 | &s->mem_region_alignment); | |
858 | if (ret < 0) { | |
859 | error_setg_errno(errp, -ret, | |
860 | "failed to get mem-region-alignment: %s", | |
861 | blkio_get_error_msg()); | |
862 | blkio_destroy(&s->blkio); | |
863 | return ret; | |
864 | } | |
865 | ||
c5640b3e SH |
866 | ret = blkio_get_bool(s->blkio, |
867 | "may-pin-mem-regions", | |
868 | &s->may_pin_mem_regions); | |
869 | if (ret < 0) { | |
870 | /* Be conservative (assume pinning) if the property is not supported */ | |
871 | s->may_pin_mem_regions = s->needs_mem_regions; | |
872 | } | |
873 | ||
874 | /* | |
875 | * Notify if libblkio drivers pin memory and prevent features like | |
876 | * virtio-mem from working. | |
877 | */ | |
878 | if (s->may_pin_mem_regions) { | |
879 | ret = ram_block_discard_disable(true); | |
880 | if (ret < 0) { | |
881 | error_setg_errno(errp, -ret, "ram_block_discard_disable() failed"); | |
882 | blkio_destroy(&s->blkio); | |
883 | return ret; | |
884 | } | |
885 | } | |
886 | ||
fd66dbd4 SH |
887 | ret = blkio_start(s->blkio); |
888 | if (ret < 0) { | |
889 | error_setg_errno(errp, -ret, "blkio_start failed: %s", | |
890 | blkio_get_error_msg()); | |
891 | blkio_destroy(&s->blkio); | |
c5640b3e SH |
892 | if (s->may_pin_mem_regions) { |
893 | ram_block_discard_disable(false); | |
894 | } | |
fd66dbd4 SH |
895 | return ret; |
896 | } | |
897 | ||
c5640b3e | 898 | bs->supported_write_flags = BDRV_REQ_FUA | BDRV_REQ_REGISTERED_BUF; |
fd66dbd4 SH |
899 | bs->supported_zero_flags = BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | |
900 | BDRV_REQ_NO_FALLBACK; | |
901 | ||
902 | qemu_mutex_init(&s->blkio_lock); | |
903 | qemu_co_mutex_init(&s->bounce_lock); | |
904 | qemu_co_queue_init(&s->bounce_available); | |
905 | QLIST_INIT(&s->bounce_bufs); | |
906 | s->blkioq = blkio_get_queue(s->blkio, 0); | |
907 | s->completion_fd = blkioq_get_completion_fd(s->blkioq); | |
9359c459 | 908 | blkioq_set_completion_fd_enabled(s->blkioq, true); |
fd66dbd4 SH |
909 | |
910 | blkio_attach_aio_context(bs, bdrv_get_aio_context(bs)); | |
911 | return 0; | |
912 | } | |
913 | ||
914 | static void blkio_close(BlockDriverState *bs) | |
915 | { | |
916 | BDRVBlkioState *s = bs->opaque; | |
917 | ||
918 | /* There is no destroy() API for s->bounce_lock */ | |
919 | ||
920 | qemu_mutex_destroy(&s->blkio_lock); | |
921 | blkio_detach_aio_context(bs); | |
922 | blkio_destroy(&s->blkio); | |
c5640b3e SH |
923 | |
924 | if (s->may_pin_mem_regions) { | |
925 | ram_block_discard_disable(false); | |
926 | } | |
fd66dbd4 SH |
927 | } |
928 | ||
c86422c5 | 929 | static int64_t coroutine_fn blkio_co_getlength(BlockDriverState *bs) |
fd66dbd4 SH |
930 | { |
931 | BDRVBlkioState *s = bs->opaque; | |
932 | uint64_t capacity; | |
933 | int ret; | |
934 | ||
935 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
936 | ret = blkio_get_uint64(s->blkio, "capacity", &capacity); | |
937 | } | |
938 | if (ret < 0) { | |
939 | return -ret; | |
940 | } | |
941 | ||
942 | return capacity; | |
943 | } | |
944 | ||
4c8f4fda AF |
945 | static int coroutine_fn blkio_truncate(BlockDriverState *bs, int64_t offset, |
946 | bool exact, PreallocMode prealloc, | |
947 | BdrvRequestFlags flags, Error **errp) | |
948 | { | |
949 | int64_t current_length; | |
950 | ||
951 | if (prealloc != PREALLOC_MODE_OFF) { | |
952 | error_setg(errp, "Unsupported preallocation mode '%s'", | |
953 | PreallocMode_str(prealloc)); | |
954 | return -ENOTSUP; | |
955 | } | |
956 | ||
c86422c5 | 957 | current_length = blkio_co_getlength(bs); |
4c8f4fda AF |
958 | |
959 | if (offset > current_length) { | |
960 | error_setg(errp, "Cannot grow device"); | |
961 | return -EINVAL; | |
962 | } else if (exact && offset != current_length) { | |
963 | error_setg(errp, "Cannot resize device"); | |
964 | return -ENOTSUP; | |
965 | } | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
3d47eb0a EGE |
970 | static int coroutine_fn |
971 | blkio_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
fd66dbd4 SH |
972 | { |
973 | return 0; | |
974 | } | |
975 | ||
976 | static void blkio_refresh_limits(BlockDriverState *bs, Error **errp) | |
977 | { | |
978 | BDRVBlkioState *s = bs->opaque; | |
979 | QEMU_LOCK_GUARD(&s->blkio_lock); | |
980 | int value; | |
981 | int ret; | |
982 | ||
983 | ret = blkio_get_int(s->blkio, "request-alignment", &value); | |
984 | if (ret < 0) { | |
985 | error_setg_errno(errp, -ret, "failed to get \"request-alignment\": %s", | |
986 | blkio_get_error_msg()); | |
987 | return; | |
988 | } | |
989 | bs->bl.request_alignment = value; | |
990 | if (bs->bl.request_alignment < 1 || | |
991 | bs->bl.request_alignment >= INT_MAX || | |
992 | !is_power_of_2(bs->bl.request_alignment)) { | |
993 | error_setg(errp, "invalid \"request-alignment\" value %" PRIu32 ", " | |
994 | "must be a power of 2 less than INT_MAX", | |
995 | bs->bl.request_alignment); | |
996 | return; | |
997 | } | |
998 | ||
999 | ret = blkio_get_int(s->blkio, "optimal-io-size", &value); | |
1000 | if (ret < 0) { | |
1001 | error_setg_errno(errp, -ret, "failed to get \"optimal-io-size\": %s", | |
1002 | blkio_get_error_msg()); | |
1003 | return; | |
1004 | } | |
1005 | bs->bl.opt_transfer = value; | |
1006 | if (bs->bl.opt_transfer > INT_MAX || | |
1007 | (bs->bl.opt_transfer % bs->bl.request_alignment)) { | |
1008 | error_setg(errp, "invalid \"optimal-io-size\" value %" PRIu32 ", must " | |
1009 | "be a multiple of %" PRIu32, bs->bl.opt_transfer, | |
1010 | bs->bl.request_alignment); | |
1011 | return; | |
1012 | } | |
1013 | ||
1014 | ret = blkio_get_int(s->blkio, "max-transfer", &value); | |
1015 | if (ret < 0) { | |
1016 | error_setg_errno(errp, -ret, "failed to get \"max-transfer\": %s", | |
1017 | blkio_get_error_msg()); | |
1018 | return; | |
1019 | } | |
1020 | bs->bl.max_transfer = value; | |
1021 | if ((bs->bl.max_transfer % bs->bl.request_alignment) || | |
1022 | (bs->bl.opt_transfer && (bs->bl.max_transfer % bs->bl.opt_transfer))) { | |
1023 | error_setg(errp, "invalid \"max-transfer\" value %" PRIu32 ", must be " | |
1024 | "a multiple of %" PRIu32 " and %" PRIu32 " (if non-zero)", | |
1025 | bs->bl.max_transfer, bs->bl.request_alignment, | |
1026 | bs->bl.opt_transfer); | |
1027 | return; | |
1028 | } | |
1029 | ||
1030 | ret = blkio_get_int(s->blkio, "buf-alignment", &value); | |
1031 | if (ret < 0) { | |
1032 | error_setg_errno(errp, -ret, "failed to get \"buf-alignment\": %s", | |
1033 | blkio_get_error_msg()); | |
1034 | return; | |
1035 | } | |
1036 | if (value < 1) { | |
1037 | error_setg(errp, "invalid \"buf-alignment\" value %d, must be " | |
1038 | "positive", value); | |
1039 | return; | |
1040 | } | |
1041 | bs->bl.min_mem_alignment = value; | |
1042 | ||
1043 | ret = blkio_get_int(s->blkio, "optimal-buf-alignment", &value); | |
1044 | if (ret < 0) { | |
1045 | error_setg_errno(errp, -ret, | |
1046 | "failed to get \"optimal-buf-alignment\": %s", | |
1047 | blkio_get_error_msg()); | |
1048 | return; | |
1049 | } | |
1050 | if (value < 1) { | |
1051 | error_setg(errp, "invalid \"optimal-buf-alignment\" value %d, " | |
1052 | "must be positive", value); | |
1053 | return; | |
1054 | } | |
1055 | bs->bl.opt_mem_alignment = value; | |
1056 | ||
1057 | ret = blkio_get_int(s->blkio, "max-segments", &value); | |
1058 | if (ret < 0) { | |
1059 | error_setg_errno(errp, -ret, "failed to get \"max-segments\": %s", | |
1060 | blkio_get_error_msg()); | |
1061 | return; | |
1062 | } | |
1063 | if (value < 1) { | |
1064 | error_setg(errp, "invalid \"max-segments\" value %d, must be positive", | |
1065 | value); | |
1066 | return; | |
1067 | } | |
1068 | bs->bl.max_iov = value; | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * TODO | |
1073 | * Missing libblkio APIs: | |
1074 | * - block_status | |
1075 | * - co_invalidate_cache | |
1076 | * | |
1077 | * Out of scope? | |
1078 | * - create | |
1079 | * - truncate | |
1080 | */ | |
1081 | ||
c21eae1c SH |
1082 | /* |
1083 | * Do not include .format_name and .protocol_name because module_block.py | |
1084 | * does not parse macros in the source code. | |
1085 | */ | |
1086 | #define BLKIO_DRIVER_COMMON \ | |
1087 | .instance_size = sizeof(BDRVBlkioState), \ | |
1088 | .bdrv_file_open = blkio_file_open, \ | |
1089 | .bdrv_close = blkio_close, \ | |
1090 | .bdrv_co_getlength = blkio_co_getlength, \ | |
1091 | .bdrv_co_truncate = blkio_truncate, \ | |
1092 | .bdrv_co_get_info = blkio_co_get_info, \ | |
1093 | .bdrv_attach_aio_context = blkio_attach_aio_context, \ | |
1094 | .bdrv_detach_aio_context = blkio_detach_aio_context, \ | |
1095 | .bdrv_co_pdiscard = blkio_co_pdiscard, \ | |
1096 | .bdrv_co_preadv = blkio_co_preadv, \ | |
1097 | .bdrv_co_pwritev = blkio_co_pwritev, \ | |
1098 | .bdrv_co_flush_to_disk = blkio_co_flush, \ | |
1099 | .bdrv_co_pwrite_zeroes = blkio_co_pwrite_zeroes, \ | |
1100 | .bdrv_refresh_limits = blkio_refresh_limits, \ | |
1101 | .bdrv_register_buf = blkio_register_buf, \ | |
1102 | .bdrv_unregister_buf = blkio_unregister_buf, | |
03d9e4c0 | 1103 | |
c21eae1c SH |
1104 | /* |
1105 | * Use the same .format_name and .protocol_name as the libblkio driver name for | |
1106 | * consistency. | |
1107 | */ | |
fd66dbd4 | 1108 | |
c21eae1c SH |
1109 | static BlockDriver bdrv_io_uring = { |
1110 | .format_name = "io_uring", | |
1111 | .protocol_name = "io_uring", | |
1112 | .bdrv_needs_filename = true, | |
1113 | BLKIO_DRIVER_COMMON | |
1114 | }; | |
1115 | ||
1116 | static BlockDriver bdrv_nvme_io_uring = { | |
1117 | .format_name = "nvme-io_uring", | |
1118 | .protocol_name = "nvme-io_uring", | |
1119 | BLKIO_DRIVER_COMMON | |
1120 | }; | |
1121 | ||
1122 | static BlockDriver bdrv_virtio_blk_vfio_pci = { | |
1123 | .format_name = "virtio-blk-vfio-pci", | |
1124 | .protocol_name = "virtio-blk-vfio-pci", | |
1125 | BLKIO_DRIVER_COMMON | |
1126 | }; | |
1127 | ||
1128 | static BlockDriver bdrv_virtio_blk_vhost_user = { | |
1129 | .format_name = "virtio-blk-vhost-user", | |
1130 | .protocol_name = "virtio-blk-vhost-user", | |
1131 | BLKIO_DRIVER_COMMON | |
1132 | }; | |
1133 | ||
1134 | static BlockDriver bdrv_virtio_blk_vhost_vdpa = { | |
1135 | .format_name = "virtio-blk-vhost-vdpa", | |
1136 | .protocol_name = "virtio-blk-vhost-vdpa", | |
1137 | BLKIO_DRIVER_COMMON | |
1138 | }; | |
fd66dbd4 SH |
1139 | |
1140 | static void bdrv_blkio_init(void) | |
1141 | { | |
1142 | bdrv_register(&bdrv_io_uring); | |
1143 | bdrv_register(&bdrv_nvme_io_uring); | |
03d9e4c0 | 1144 | bdrv_register(&bdrv_virtio_blk_vfio_pci); |
fd66dbd4 SH |
1145 | bdrv_register(&bdrv_virtio_blk_vhost_user); |
1146 | bdrv_register(&bdrv_virtio_blk_vhost_vdpa); | |
1147 | } | |
1148 | ||
1149 | block_init(bdrv_blkio_init); |