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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2014 Red Hat | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <unistd.h> | |
16 | #include <stdlib.h> | |
17 | #include <sys/types.h> | |
18 | #include <sys/stat.h> | |
19 | #include <fcntl.h> | |
20 | ||
21 | #include "KernelDevice.h" | |
22 | #include "include/types.h" | |
23 | #include "include/compat.h" | |
24 | #include "include/stringify.h" | |
25 | #include "common/errno.h" | |
26 | #include "common/debug.h" | |
27 | #include "common/blkdev.h" | |
28 | #include "common/align.h" | |
29 | #include "common/blkdev.h" | |
30 | ||
31 | #define dout_context cct | |
32 | #define dout_subsys ceph_subsys_bdev | |
33 | #undef dout_prefix | |
34 | #define dout_prefix *_dout << "bdev(" << this << " " << path << ") " | |
35 | ||
36 | KernelDevice::KernelDevice(CephContext* cct, aio_callback_t cb, void *cbpriv) | |
37 | : BlockDevice(cct), | |
38 | fd_direct(-1), | |
39 | fd_buffered(-1), | |
40 | size(0), block_size(0), | |
41 | fs(NULL), aio(false), dio(false), | |
42 | debug_lock("KernelDevice::debug_lock"), | |
43 | aio_queue(cct->_conf->bdev_aio_max_queue_depth), | |
44 | aio_callback(cb), | |
45 | aio_callback_priv(cbpriv), | |
46 | aio_stop(false), | |
47 | aio_thread(this), | |
48 | injecting_crash(0) | |
49 | { | |
50 | } | |
51 | ||
52 | int KernelDevice::_lock() | |
53 | { | |
54 | struct flock l; | |
55 | memset(&l, 0, sizeof(l)); | |
56 | l.l_type = F_WRLCK; | |
57 | l.l_whence = SEEK_SET; | |
58 | int r = ::fcntl(fd_direct, F_SETLK, &l); | |
59 | if (r < 0) | |
60 | return -errno; | |
61 | return 0; | |
62 | } | |
63 | ||
64 | int KernelDevice::open(const string& p) | |
65 | { | |
66 | path = p; | |
67 | int r = 0; | |
68 | dout(1) << __func__ << " path " << path << dendl; | |
69 | ||
70 | fd_direct = ::open(path.c_str(), O_RDWR | O_DIRECT); | |
71 | if (fd_direct < 0) { | |
72 | r = -errno; | |
73 | derr << __func__ << " open got: " << cpp_strerror(r) << dendl; | |
74 | return r; | |
75 | } | |
76 | fd_buffered = ::open(path.c_str(), O_RDWR); | |
77 | if (fd_buffered < 0) { | |
78 | r = -errno; | |
79 | derr << __func__ << " open got: " << cpp_strerror(r) << dendl; | |
80 | goto out_direct; | |
81 | } | |
82 | dio = true; | |
83 | aio = cct->_conf->bdev_aio; | |
84 | if (!aio) { | |
85 | assert(0 == "non-aio not supported"); | |
86 | } | |
87 | ||
88 | // disable readahead as it will wreak havoc on our mix of | |
89 | // directio/aio and buffered io. | |
90 | r = posix_fadvise(fd_buffered, 0, 0, POSIX_FADV_RANDOM); | |
91 | if (r) { | |
92 | r = -r; | |
93 | derr << __func__ << " open got: " << cpp_strerror(r) << dendl; | |
94 | goto out_fail; | |
95 | } | |
96 | ||
97 | r = _lock(); | |
98 | if (r < 0) { | |
99 | derr << __func__ << " failed to lock " << path << ": " << cpp_strerror(r) | |
100 | << dendl; | |
101 | goto out_fail; | |
102 | } | |
103 | ||
104 | struct stat st; | |
105 | r = ::fstat(fd_direct, &st); | |
106 | if (r < 0) { | |
107 | r = -errno; | |
108 | derr << __func__ << " fstat got " << cpp_strerror(r) << dendl; | |
109 | goto out_fail; | |
110 | } | |
111 | ||
112 | // Operate as though the block size is 4 KB. The backing file | |
113 | // blksize doesn't strictly matter except that some file systems may | |
114 | // require a read/modify/write if we write something smaller than | |
115 | // it. | |
116 | block_size = cct->_conf->bdev_block_size; | |
117 | if (block_size != (unsigned)st.st_blksize) { | |
118 | dout(1) << __func__ << " backing device/file reports st_blksize " | |
119 | << st.st_blksize << ", using bdev_block_size " | |
120 | << block_size << " anyway" << dendl; | |
121 | } | |
122 | ||
123 | if (S_ISBLK(st.st_mode)) { | |
124 | int64_t s; | |
125 | r = get_block_device_size(fd_direct, &s); | |
126 | if (r < 0) { | |
127 | goto out_fail; | |
128 | } | |
129 | size = s; | |
130 | } else { | |
131 | size = st.st_size; | |
132 | } | |
133 | size &= ~(block_size); | |
134 | ||
135 | { | |
136 | char partition[PATH_MAX], devname[PATH_MAX]; | |
137 | r = get_device_by_fd(fd_buffered, partition, devname, sizeof(devname)); | |
138 | if (r < 0) { | |
139 | derr << "unable to get device name for " << path << ": " | |
140 | << cpp_strerror(r) << dendl; | |
141 | rotational = true; | |
142 | } else { | |
143 | dout(20) << __func__ << " devname " << devname << dendl; | |
144 | rotational = block_device_is_rotational(devname); | |
145 | } | |
146 | } | |
147 | ||
31f18b77 FG |
148 | r = _aio_start(); |
149 | if (r < 0) { | |
150 | goto out_fail; | |
151 | } | |
152 | ||
7c673cae FG |
153 | fs = FS::create_by_fd(fd_direct); |
154 | assert(fs); | |
155 | ||
156 | // round size down to an even block | |
157 | size &= ~(block_size - 1); | |
158 | ||
7c673cae FG |
159 | dout(1) << __func__ |
160 | << " size " << size | |
161 | << " (0x" << std::hex << size << std::dec << ", " | |
162 | << pretty_si_t(size) << "B)" | |
163 | << " block_size " << block_size | |
164 | << " (" << pretty_si_t(block_size) << "B)" | |
165 | << " " << (rotational ? "rotational" : "non-rotational") | |
166 | << dendl; | |
167 | return 0; | |
168 | ||
169 | out_fail: | |
170 | VOID_TEMP_FAILURE_RETRY(::close(fd_buffered)); | |
171 | fd_buffered = -1; | |
172 | out_direct: | |
173 | VOID_TEMP_FAILURE_RETRY(::close(fd_direct)); | |
174 | fd_direct = -1; | |
175 | return r; | |
176 | } | |
177 | ||
178 | void KernelDevice::close() | |
179 | { | |
180 | dout(1) << __func__ << dendl; | |
181 | _aio_stop(); | |
182 | ||
183 | assert(fs); | |
184 | delete fs; | |
185 | fs = NULL; | |
186 | ||
187 | assert(fd_direct >= 0); | |
188 | VOID_TEMP_FAILURE_RETRY(::close(fd_direct)); | |
189 | fd_direct = -1; | |
190 | ||
191 | assert(fd_buffered >= 0); | |
192 | VOID_TEMP_FAILURE_RETRY(::close(fd_buffered)); | |
193 | fd_buffered = -1; | |
194 | ||
195 | path.clear(); | |
196 | } | |
197 | ||
198 | static string get_dev_property(const char *dev, const char *property) | |
199 | { | |
200 | char val[1024] = {0}; | |
201 | get_block_device_string_property(dev, property, val, sizeof(val)); | |
202 | return val; | |
203 | } | |
204 | ||
205 | int KernelDevice::collect_metadata(string prefix, map<string,string> *pm) const | |
206 | { | |
207 | (*pm)[prefix + "rotational"] = stringify((int)(bool)rotational); | |
208 | (*pm)[prefix + "size"] = stringify(get_size()); | |
209 | (*pm)[prefix + "block_size"] = stringify(get_block_size()); | |
210 | (*pm)[prefix + "driver"] = "KernelDevice"; | |
211 | if (rotational) { | |
212 | (*pm)[prefix + "type"] = "hdd"; | |
213 | } else { | |
214 | (*pm)[prefix + "type"] = "ssd"; | |
215 | } | |
216 | ||
217 | struct stat st; | |
218 | int r = ::fstat(fd_buffered, &st); | |
219 | if (r < 0) | |
220 | return -errno; | |
221 | if (S_ISBLK(st.st_mode)) { | |
222 | (*pm)[prefix + "access_mode"] = "blk"; | |
223 | char partition_path[PATH_MAX]; | |
224 | char dev_node[PATH_MAX]; | |
225 | int rc = get_device_by_fd(fd_buffered, partition_path, dev_node, PATH_MAX); | |
226 | switch (rc) { | |
227 | case -EOPNOTSUPP: | |
228 | case -EINVAL: | |
229 | (*pm)[prefix + "partition_path"] = "unknown"; | |
230 | (*pm)[prefix + "dev_node"] = "unknown"; | |
231 | break; | |
232 | case -ENODEV: | |
233 | (*pm)[prefix + "partition_path"] = string(partition_path); | |
234 | (*pm)[prefix + "dev_node"] = "unknown"; | |
235 | break; | |
236 | default: | |
237 | { | |
238 | (*pm)[prefix + "partition_path"] = string(partition_path); | |
239 | (*pm)[prefix + "dev_node"] = string(dev_node); | |
240 | (*pm)[prefix + "model"] = get_dev_property(dev_node, "device/model"); | |
241 | (*pm)[prefix + "dev"] = get_dev_property(dev_node, "dev"); | |
242 | ||
243 | // nvme exposes a serial number | |
244 | string serial = get_dev_property(dev_node, "device/serial"); | |
245 | if (serial.length()) { | |
246 | (*pm)[prefix + "serial"] = serial; | |
247 | } | |
248 | ||
249 | // nvme has a device/device/* structure; infer from that. there | |
250 | // is probably a better way? | |
251 | string nvme_vendor = get_dev_property(dev_node, "device/device/vendor"); | |
252 | if (nvme_vendor.length()) { | |
253 | (*pm)[prefix + "type"] = "nvme"; | |
254 | } | |
255 | } | |
256 | } | |
257 | } else { | |
258 | (*pm)[prefix + "access_mode"] = "file"; | |
259 | (*pm)[prefix + "path"] = path; | |
260 | } | |
261 | return 0; | |
262 | } | |
263 | ||
264 | int KernelDevice::flush() | |
265 | { | |
31f18b77 | 266 | // protect flush with a mutex. note that we are not really protecting |
7c673cae FG |
267 | // data here. instead, we're ensuring that if any flush() caller |
268 | // sees that io_since_flush is true, they block any racing callers | |
269 | // until the flush is observed. that allows racing threads to be | |
270 | // calling flush while still ensuring that *any* of them that got an | |
271 | // aio completion notification will not return before that aio is | |
272 | // stable on disk: whichever thread sees the flag first will block | |
273 | // followers until the aio is stable. | |
274 | std::lock_guard<std::mutex> l(flush_mutex); | |
275 | ||
276 | bool expect = true; | |
277 | if (!io_since_flush.compare_exchange_strong(expect, false)) { | |
278 | dout(10) << __func__ << " no-op (no ios since last flush), flag is " | |
279 | << (int)io_since_flush.load() << dendl; | |
280 | return 0; | |
281 | } | |
282 | ||
283 | dout(10) << __func__ << " start" << dendl; | |
284 | if (cct->_conf->bdev_inject_crash) { | |
285 | ++injecting_crash; | |
286 | // sleep for a moment to give other threads a chance to submit or | |
287 | // wait on io that races with a flush. | |
288 | derr << __func__ << " injecting crash. first we sleep..." << dendl; | |
289 | sleep(cct->_conf->bdev_inject_crash_flush_delay); | |
290 | derr << __func__ << " and now we die" << dendl; | |
291 | cct->_log->flush(); | |
292 | _exit(1); | |
293 | } | |
294 | utime_t start = ceph_clock_now(); | |
295 | int r = ::fdatasync(fd_direct); | |
296 | utime_t end = ceph_clock_now(); | |
297 | utime_t dur = end - start; | |
298 | if (r < 0) { | |
299 | r = -errno; | |
300 | derr << __func__ << " fdatasync got: " << cpp_strerror(r) << dendl; | |
301 | ceph_abort(); | |
302 | } | |
303 | dout(5) << __func__ << " in " << dur << dendl;; | |
304 | return r; | |
305 | } | |
306 | ||
307 | int KernelDevice::_aio_start() | |
308 | { | |
309 | if (aio) { | |
310 | dout(10) << __func__ << dendl; | |
311 | int r = aio_queue.init(); | |
312 | if (r < 0) { | |
31f18b77 FG |
313 | if (r == -EAGAIN) { |
314 | derr << __func__ << " io_setup(2) failed with EAGAIN; " | |
315 | << "try increasing /proc/sys/fs/aio-max-nr" << dendl; | |
316 | } else { | |
317 | derr << __func__ << " io_setup(2) failed: " << cpp_strerror(r) << dendl; | |
318 | } | |
7c673cae FG |
319 | return r; |
320 | } | |
321 | aio_thread.create("bstore_aio"); | |
322 | } | |
323 | return 0; | |
324 | } | |
325 | ||
326 | void KernelDevice::_aio_stop() | |
327 | { | |
328 | if (aio) { | |
329 | dout(10) << __func__ << dendl; | |
330 | aio_stop = true; | |
331 | aio_thread.join(); | |
332 | aio_stop = false; | |
333 | aio_queue.shutdown(); | |
334 | } | |
335 | } | |
336 | ||
337 | void KernelDevice::_aio_thread() | |
338 | { | |
339 | dout(10) << __func__ << " start" << dendl; | |
340 | int inject_crash_count = 0; | |
341 | while (!aio_stop) { | |
342 | dout(40) << __func__ << " polling" << dendl; | |
343 | int max = 16; | |
344 | aio_t *aio[max]; | |
345 | int r = aio_queue.get_next_completed(cct->_conf->bdev_aio_poll_ms, | |
346 | aio, max); | |
347 | if (r < 0) { | |
348 | derr << __func__ << " got " << cpp_strerror(r) << dendl; | |
349 | } | |
350 | if (r > 0) { | |
351 | dout(30) << __func__ << " got " << r << " completed aios" << dendl; | |
352 | for (int i = 0; i < r; ++i) { | |
353 | IOContext *ioc = static_cast<IOContext*>(aio[i]->priv); | |
354 | _aio_log_finish(ioc, aio[i]->offset, aio[i]->length); | |
355 | if (aio[i]->queue_item.is_linked()) { | |
356 | std::lock_guard<std::mutex> l(debug_queue_lock); | |
357 | debug_aio_unlink(*aio[i]); | |
358 | } | |
359 | ||
360 | // set flag indicating new ios have completed. we do this *before* | |
361 | // any completion or notifications so that any user flush() that | |
362 | // follows the observed io completion will include this io. Note | |
363 | // that an earlier, racing flush() could observe and clear this | |
364 | // flag, but that also ensures that the IO will be stable before the | |
365 | // later flush() occurs. | |
366 | io_since_flush.store(true); | |
367 | ||
368 | int r = aio[i]->get_return_value(); | |
369 | dout(10) << __func__ << " finished aio " << aio[i] << " r " << r | |
370 | << " ioc " << ioc | |
371 | << " with " << (ioc->num_running.load() - 1) | |
372 | << " aios left" << dendl; | |
373 | assert(r >= 0); | |
374 | ||
375 | // NOTE: once num_running and we either call the callback or | |
376 | // call aio_wake we cannot touch ioc or aio[] as the caller | |
377 | // may free it. | |
378 | if (ioc->priv) { | |
379 | if (--ioc->num_running == 0) { | |
380 | aio_callback(aio_callback_priv, ioc->priv); | |
381 | } | |
382 | } else { | |
31f18b77 | 383 | ioc->try_aio_wake(); |
7c673cae FG |
384 | } |
385 | } | |
386 | } | |
387 | if (cct->_conf->bdev_debug_aio) { | |
388 | utime_t now = ceph_clock_now(); | |
389 | std::lock_guard<std::mutex> l(debug_queue_lock); | |
390 | if (debug_oldest) { | |
391 | if (debug_stall_since == utime_t()) { | |
392 | debug_stall_since = now; | |
393 | } else { | |
394 | utime_t cutoff = now; | |
395 | cutoff -= cct->_conf->bdev_debug_aio_suicide_timeout; | |
396 | if (debug_stall_since < cutoff) { | |
397 | derr << __func__ << " stalled aio " << debug_oldest | |
398 | << " since " << debug_stall_since << ", timeout is " | |
399 | << cct->_conf->bdev_debug_aio_suicide_timeout | |
400 | << "s, suicide" << dendl; | |
401 | assert(0 == "stalled aio... buggy kernel or bad device?"); | |
402 | } | |
403 | } | |
404 | } | |
405 | } | |
406 | reap_ioc(); | |
407 | if (cct->_conf->bdev_inject_crash) { | |
408 | ++inject_crash_count; | |
409 | if (inject_crash_count * cct->_conf->bdev_aio_poll_ms / 1000 > | |
410 | cct->_conf->bdev_inject_crash + cct->_conf->bdev_inject_crash_flush_delay) { | |
411 | derr << __func__ << " bdev_inject_crash trigger from aio thread" | |
412 | << dendl; | |
413 | cct->_log->flush(); | |
414 | _exit(1); | |
415 | } | |
416 | } | |
417 | } | |
418 | reap_ioc(); | |
419 | dout(10) << __func__ << " end" << dendl; | |
420 | } | |
421 | ||
422 | void KernelDevice::_aio_log_start( | |
423 | IOContext *ioc, | |
424 | uint64_t offset, | |
425 | uint64_t length) | |
426 | { | |
427 | dout(20) << __func__ << " 0x" << std::hex << offset << "~" << length | |
428 | << std::dec << dendl; | |
429 | if (cct->_conf->bdev_debug_inflight_ios) { | |
430 | Mutex::Locker l(debug_lock); | |
431 | if (debug_inflight.intersects(offset, length)) { | |
432 | derr << __func__ << " inflight overlap of 0x" | |
433 | << std::hex | |
434 | << offset << "~" << length << std::dec | |
435 | << " with " << debug_inflight << dendl; | |
436 | ceph_abort(); | |
437 | } | |
438 | debug_inflight.insert(offset, length); | |
439 | } | |
440 | } | |
441 | ||
442 | void KernelDevice::debug_aio_link(aio_t& aio) | |
443 | { | |
444 | if (debug_queue.empty()) { | |
445 | debug_oldest = &aio; | |
446 | } | |
447 | debug_queue.push_back(aio); | |
448 | } | |
449 | ||
450 | void KernelDevice::debug_aio_unlink(aio_t& aio) | |
451 | { | |
452 | if (aio.queue_item.is_linked()) { | |
453 | debug_queue.erase(debug_queue.iterator_to(aio)); | |
454 | if (debug_oldest == &aio) { | |
455 | if (debug_queue.empty()) { | |
456 | debug_oldest = nullptr; | |
457 | } else { | |
458 | debug_oldest = &debug_queue.front(); | |
459 | } | |
460 | debug_stall_since = utime_t(); | |
461 | } | |
462 | } | |
463 | } | |
464 | ||
465 | void KernelDevice::_aio_log_finish( | |
466 | IOContext *ioc, | |
467 | uint64_t offset, | |
468 | uint64_t length) | |
469 | { | |
470 | dout(20) << __func__ << " " << aio << " 0x" | |
471 | << std::hex << offset << "~" << length << std::dec << dendl; | |
472 | if (cct->_conf->bdev_debug_inflight_ios) { | |
473 | Mutex::Locker l(debug_lock); | |
474 | debug_inflight.erase(offset, length); | |
475 | } | |
476 | } | |
477 | ||
478 | void KernelDevice::aio_submit(IOContext *ioc) | |
479 | { | |
480 | dout(20) << __func__ << " ioc " << ioc | |
481 | << " pending " << ioc->num_pending.load() | |
482 | << " running " << ioc->num_running.load() | |
483 | << dendl; | |
484 | if (ioc->num_pending.load() == 0) { | |
485 | return; | |
486 | } | |
487 | // move these aside, and get our end iterator position now, as the | |
488 | // aios might complete as soon as they are submitted and queue more | |
489 | // wal aio's. | |
490 | list<aio_t>::iterator e = ioc->running_aios.begin(); | |
491 | ioc->running_aios.splice(e, ioc->pending_aios); | |
492 | list<aio_t>::iterator p = ioc->running_aios.begin(); | |
493 | ||
494 | int pending = ioc->num_pending.load(); | |
495 | ioc->num_running += pending; | |
496 | ioc->num_pending -= pending; | |
497 | assert(ioc->num_pending.load() == 0); // we should be only thread doing this | |
498 | ||
499 | bool done = false; | |
500 | while (!done) { | |
501 | aio_t& aio = *p; | |
502 | aio.priv = static_cast<void*>(ioc); | |
503 | dout(20) << __func__ << " aio " << &aio << " fd " << aio.fd | |
504 | << " 0x" << std::hex << aio.offset << "~" << aio.length | |
505 | << std::dec << dendl; | |
506 | for (auto& io : aio.iov) | |
507 | dout(30) << __func__ << " iov " << (void*)io.iov_base | |
508 | << " len " << io.iov_len << dendl; | |
509 | ||
510 | // be careful: as soon as we submit aio we race with completion. | |
511 | // since we are holding a ref take care not to dereference txc at | |
512 | // all after that point. | |
513 | list<aio_t>::iterator cur = p; | |
514 | ++p; | |
515 | done = (p == e); | |
516 | ||
517 | // do not dereference txc (or it's contents) after we submit (if | |
518 | // done == true and we don't loop) | |
519 | int retries = 0; | |
520 | if (cct->_conf->bdev_debug_aio) { | |
521 | std::lock_guard<std::mutex> l(debug_queue_lock); | |
522 | debug_aio_link(*cur); | |
523 | } | |
524 | int r = aio_queue.submit(*cur, &retries); | |
525 | if (retries) | |
526 | derr << __func__ << " retries " << retries << dendl; | |
527 | if (r) { | |
528 | derr << " aio submit got " << cpp_strerror(r) << dendl; | |
529 | assert(r == 0); | |
530 | } | |
531 | } | |
532 | } | |
533 | ||
534 | int KernelDevice::_sync_write(uint64_t off, bufferlist &bl, bool buffered) | |
535 | { | |
536 | uint64_t len = bl.length(); | |
537 | dout(5) << __func__ << " 0x" << std::hex << off << "~" << len | |
538 | << std::dec << " buffered" << dendl; | |
539 | if (cct->_conf->bdev_inject_crash && | |
540 | rand() % cct->_conf->bdev_inject_crash == 0) { | |
541 | derr << __func__ << " bdev_inject_crash: dropping io 0x" << std::hex | |
542 | << off << "~" << len << std::dec << dendl; | |
543 | ++injecting_crash; | |
544 | return 0; | |
545 | } | |
546 | vector<iovec> iov; | |
547 | bl.prepare_iov(&iov); | |
548 | int r = ::pwritev(buffered ? fd_buffered : fd_direct, | |
549 | &iov[0], iov.size(), off); | |
550 | ||
551 | if (r < 0) { | |
552 | r = -errno; | |
553 | derr << __func__ << " pwritev error: " << cpp_strerror(r) << dendl; | |
554 | return r; | |
555 | } | |
556 | if (buffered) { | |
557 | // initiate IO (but do not wait) | |
558 | r = ::sync_file_range(fd_buffered, off, len, SYNC_FILE_RANGE_WRITE); | |
559 | if (r < 0) { | |
560 | r = -errno; | |
561 | derr << __func__ << " sync_file_range error: " << cpp_strerror(r) << dendl; | |
562 | return r; | |
563 | } | |
564 | } | |
31f18b77 FG |
565 | |
566 | io_since_flush.store(true); | |
567 | ||
7c673cae FG |
568 | return 0; |
569 | } | |
570 | ||
571 | int KernelDevice::write( | |
572 | uint64_t off, | |
573 | bufferlist &bl, | |
574 | bool buffered) | |
575 | { | |
576 | uint64_t len = bl.length(); | |
577 | dout(20) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec | |
578 | << (buffered ? " (buffered)" : " (direct)") | |
579 | << dendl; | |
580 | assert(off % block_size == 0); | |
581 | assert(len % block_size == 0); | |
582 | assert(len > 0); | |
583 | assert(off < size); | |
584 | assert(off + len <= size); | |
585 | ||
586 | if ((!buffered || bl.get_num_buffers() >= IOV_MAX) && | |
587 | bl.rebuild_aligned_size_and_memory(block_size, block_size)) { | |
588 | dout(20) << __func__ << " rebuilding buffer to be aligned" << dendl; | |
589 | } | |
590 | dout(40) << "data: "; | |
591 | bl.hexdump(*_dout); | |
592 | *_dout << dendl; | |
593 | ||
594 | return _sync_write(off, bl, buffered); | |
595 | } | |
596 | ||
597 | int KernelDevice::aio_write( | |
598 | uint64_t off, | |
599 | bufferlist &bl, | |
600 | IOContext *ioc, | |
601 | bool buffered) | |
602 | { | |
603 | uint64_t len = bl.length(); | |
604 | dout(20) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec | |
605 | << (buffered ? " (buffered)" : " (direct)") | |
606 | << dendl; | |
607 | assert(off % block_size == 0); | |
608 | assert(len % block_size == 0); | |
609 | assert(len > 0); | |
610 | assert(off < size); | |
611 | assert(off + len <= size); | |
612 | ||
613 | if ((!buffered || bl.get_num_buffers() >= IOV_MAX) && | |
614 | bl.rebuild_aligned_size_and_memory(block_size, block_size)) { | |
615 | dout(20) << __func__ << " rebuilding buffer to be aligned" << dendl; | |
616 | } | |
617 | dout(40) << "data: "; | |
618 | bl.hexdump(*_dout); | |
619 | *_dout << dendl; | |
620 | ||
621 | _aio_log_start(ioc, off, len); | |
622 | ||
623 | #ifdef HAVE_LIBAIO | |
624 | if (aio && dio && !buffered) { | |
625 | ioc->pending_aios.push_back(aio_t(ioc, fd_direct)); | |
626 | ++ioc->num_pending; | |
627 | aio_t& aio = ioc->pending_aios.back(); | |
628 | if (cct->_conf->bdev_inject_crash && | |
629 | rand() % cct->_conf->bdev_inject_crash == 0) { | |
630 | derr << __func__ << " bdev_inject_crash: dropping io 0x" << std::hex | |
631 | << off << "~" << len << std::dec | |
632 | << dendl; | |
633 | // generate a real io so that aio_wait behaves properly, but make it | |
634 | // a read instead of write, and toss the result. | |
635 | aio.pread(off, len); | |
636 | ++injecting_crash; | |
637 | } else { | |
638 | bl.prepare_iov(&aio.iov); | |
639 | for (unsigned i=0; i<aio.iov.size(); ++i) { | |
640 | dout(30) << "aio " << i << " " << aio.iov[i].iov_base | |
641 | << " " << aio.iov[i].iov_len << dendl; | |
642 | } | |
643 | aio.bl.claim_append(bl); | |
644 | aio.pwritev(off, len); | |
645 | } | |
646 | dout(5) << __func__ << " 0x" << std::hex << off << "~" << len | |
647 | << std::dec << " aio " << &aio << dendl; | |
648 | } else | |
649 | #endif | |
650 | { | |
651 | int r = _sync_write(off, bl, buffered); | |
652 | _aio_log_finish(ioc, off, len); | |
653 | if (r < 0) | |
654 | return r; | |
655 | } | |
656 | return 0; | |
657 | } | |
658 | ||
659 | int KernelDevice::read(uint64_t off, uint64_t len, bufferlist *pbl, | |
660 | IOContext *ioc, | |
661 | bool buffered) | |
662 | { | |
663 | dout(5) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec | |
664 | << (buffered ? " (buffered)" : " (direct)") | |
665 | << dendl; | |
666 | assert(off % block_size == 0); | |
667 | assert(len % block_size == 0); | |
668 | assert(len > 0); | |
669 | assert(off < size); | |
670 | assert(off + len <= size); | |
671 | ||
672 | _aio_log_start(ioc, off, len); | |
673 | ||
674 | bufferptr p = buffer::create_page_aligned(len); | |
675 | int r = ::pread(buffered ? fd_buffered : fd_direct, | |
676 | p.c_str(), len, off); | |
677 | if (r < 0) { | |
678 | r = -errno; | |
679 | goto out; | |
680 | } | |
681 | assert((uint64_t)r == len); | |
682 | pbl->push_back(std::move(p)); | |
683 | ||
684 | dout(40) << "data: "; | |
685 | pbl->hexdump(*_dout); | |
686 | *_dout << dendl; | |
687 | ||
688 | out: | |
689 | _aio_log_finish(ioc, off, len); | |
690 | return r < 0 ? r : 0; | |
691 | } | |
692 | ||
693 | int KernelDevice::aio_read( | |
694 | uint64_t off, | |
695 | uint64_t len, | |
696 | bufferlist *pbl, | |
697 | IOContext *ioc) | |
698 | { | |
699 | dout(5) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec | |
700 | << dendl; | |
701 | ||
702 | int r = 0; | |
703 | #ifdef HAVE_LIBAIO | |
704 | if (aio && dio) { | |
705 | _aio_log_start(ioc, off, len); | |
706 | ioc->pending_aios.push_back(aio_t(ioc, fd_direct)); | |
707 | ++ioc->num_pending; | |
708 | aio_t& aio = ioc->pending_aios.back(); | |
709 | aio.pread(off, len); | |
710 | for (unsigned i=0; i<aio.iov.size(); ++i) { | |
711 | dout(30) << "aio " << i << " " << aio.iov[i].iov_base | |
712 | << " " << aio.iov[i].iov_len << dendl; | |
713 | } | |
714 | pbl->append(aio.bl); | |
715 | dout(5) << __func__ << " 0x" << std::hex << off << "~" << len | |
716 | << std::dec << " aio " << &aio << dendl; | |
717 | } else | |
718 | #endif | |
719 | { | |
720 | r = read(off, len, pbl, ioc, false); | |
721 | } | |
722 | ||
723 | return r; | |
724 | } | |
725 | ||
726 | int KernelDevice::direct_read_unaligned(uint64_t off, uint64_t len, char *buf) | |
727 | { | |
728 | uint64_t aligned_off = align_down(off, block_size); | |
729 | uint64_t aligned_len = align_up(off+len, block_size) - aligned_off; | |
730 | bufferptr p = buffer::create_page_aligned(aligned_len); | |
731 | int r = 0; | |
732 | ||
733 | r = ::pread(fd_direct, p.c_str(), aligned_len, aligned_off); | |
734 | if (r < 0) { | |
735 | r = -errno; | |
736 | derr << __func__ << " 0x" << std::hex << off << "~" << len << std::dec | |
737 | << " error: " << cpp_strerror(r) << dendl; | |
738 | goto out; | |
739 | } | |
740 | assert((uint64_t)r == aligned_len); | |
741 | memcpy(buf, p.c_str() + (off - aligned_off), len); | |
742 | ||
743 | dout(40) << __func__ << " data: "; | |
744 | bufferlist bl; | |
745 | bl.append(buf, len); | |
746 | bl.hexdump(*_dout); | |
747 | *_dout << dendl; | |
748 | ||
749 | out: | |
750 | return r < 0 ? r : 0; | |
751 | } | |
752 | ||
753 | int KernelDevice::read_random(uint64_t off, uint64_t len, char *buf, | |
754 | bool buffered) | |
755 | { | |
756 | dout(5) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec | |
757 | << dendl; | |
758 | assert(len > 0); | |
759 | assert(off < size); | |
760 | assert(off + len <= size); | |
761 | int r = 0; | |
762 | ||
763 | //if it's direct io and unaligned, we have to use a internal buffer | |
764 | if (!buffered && ((off % block_size != 0) | |
765 | || (len % block_size != 0) | |
766 | || (uintptr_t(buf) % CEPH_PAGE_SIZE != 0))) | |
767 | return direct_read_unaligned(off, len, buf); | |
768 | ||
769 | if (buffered) { | |
770 | //buffered read | |
771 | char *t = buf; | |
772 | uint64_t left = len; | |
773 | while (left > 0) { | |
774 | r = ::pread(fd_buffered, t, left, off); | |
775 | if (r < 0) { | |
776 | r = -errno; | |
777 | derr << __func__ << " 0x" << std::hex << off << "~" << left | |
778 | << std::dec << " error: " << cpp_strerror(r) << dendl; | |
779 | goto out; | |
780 | } | |
781 | off += r; | |
782 | t += r; | |
783 | left -= r; | |
784 | } | |
785 | } else { | |
786 | //direct and aligned read | |
787 | r = ::pread(fd_direct, buf, len, off); | |
788 | if (r < 0) { | |
789 | r = -errno; | |
790 | derr << __func__ << " direct_aligned_read" << " 0x" << std::hex | |
791 | << off << "~" << left << std::dec << " error: " << cpp_strerror(r) | |
792 | << dendl; | |
793 | goto out; | |
794 | } | |
795 | assert((uint64_t)r == len); | |
796 | } | |
797 | ||
798 | dout(40) << __func__ << " data: "; | |
799 | bufferlist bl; | |
800 | bl.append(buf, len); | |
801 | bl.hexdump(*_dout); | |
802 | *_dout << dendl; | |
803 | ||
804 | out: | |
805 | return r < 0 ? r : 0; | |
806 | } | |
807 | ||
808 | int KernelDevice::invalidate_cache(uint64_t off, uint64_t len) | |
809 | { | |
810 | dout(5) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec | |
811 | << dendl; | |
812 | assert(off % block_size == 0); | |
813 | assert(len % block_size == 0); | |
814 | int r = posix_fadvise(fd_buffered, off, len, POSIX_FADV_DONTNEED); | |
815 | if (r) { | |
816 | r = -r; | |
817 | derr << __func__ << " 0x" << std::hex << off << "~" << len << std::dec | |
818 | << " error: " << cpp_strerror(r) << dendl; | |
819 | } | |
820 | return r; | |
821 | } | |
822 |