Commit | Line | Data |
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d0ca268b JA |
1 | /* |
2 | * block queue tracing application | |
3 | * | |
d956a2cd | 4 | * Copyright (C) 2005 Jens Axboe <axboe@suse.de> |
46e37c55 | 5 | * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk> |
d956a2cd | 6 | * |
3fe0b570 AB |
7 | * Rewrite to have a single thread per CPU (managing all devices on that CPU) |
8 | * Alan D. Brunelle <alan.brunelle@hp.com> - January 2009 | |
9 | * | |
d956a2cd JA |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
d0ca268b | 24 | */ |
3fe0b570 AB |
25 | |
26 | #include <errno.h> | |
27 | #include <stdarg.h> | |
28 | #include <stdio.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
31 | #include <fcntl.h> | |
32 | #include <getopt.h> | |
33 | #include <sched.h> | |
d0ca268b | 34 | #include <unistd.h> |
3fe0b570 | 35 | #include <poll.h> |
d0ca268b | 36 | #include <signal.h> |
3fe0b570 AB |
37 | #include <pthread.h> |
38 | #include <locale.h> | |
d0ca268b | 39 | #include <sys/ioctl.h> |
3fe0b570 AB |
40 | #include <sys/types.h> |
41 | #include <sys/stat.h> | |
42 | #include <sys/vfs.h> | |
b7106311 | 43 | #include <sys/mman.h> |
3fe0b570 AB |
44 | #include <sys/param.h> |
45 | #include <sys/time.h> | |
46 | #include <sys/resource.h> | |
8e86c98a | 47 | #include <sys/socket.h> |
8e86c98a JA |
48 | #include <netinet/in.h> |
49 | #include <arpa/inet.h> | |
50 | #include <netdb.h> | |
32f18c48 | 51 | #include <sys/sendfile.h> |
d0ca268b | 52 | |
3fe0b570 | 53 | #include "btt/list.h" |
d0ca268b | 54 | #include "blktrace.h" |
52724a0e | 55 | |
8f551a39 JA |
56 | /* |
57 | * You may want to increase this even more, if you are logging at a high | |
58 | * rate and see skipped/missed events | |
59 | */ | |
3fe0b570 AB |
60 | #define BUF_SIZE (512 * 1024) |
61 | #define BUF_NR (4) | |
62 | ||
63 | #define FILE_VBUF_SIZE (128 * 1024) | |
64 | ||
65 | #define DEBUGFS_TYPE (0x64626720) | |
66 | #define TRACE_NET_PORT (8462) | |
67 | ||
68 | enum { | |
69 | Net_none = 0, | |
70 | Net_server, | |
71 | Net_client, | |
72 | }; | |
73 | ||
df81fdb5 AB |
74 | enum thread_status { |
75 | Th_running, | |
76 | Th_leaving, | |
77 | Th_error | |
78 | }; | |
79 | ||
3fe0b570 AB |
80 | /* |
81 | * Generic stats collected: nevents can be _roughly_ estimated by data_read | |
82 | * (discounting pdu...) | |
83 | * | |
84 | * These fields are updated w/ pdc_dr_update & pdc_nev_update below. | |
85 | */ | |
86 | struct pdc_stats { | |
87 | unsigned long long data_read; | |
88 | unsigned long long nevents; | |
89 | }; | |
90 | ||
91 | struct devpath { | |
92 | struct list_head head; | |
93 | char *path; /* path to device special file */ | |
94 | char *buts_name; /* name returned from bt kernel code */ | |
95 | struct pdc_stats *stats; | |
96 | int fd, idx, ncpus; | |
97 | unsigned long long drops; | |
98 | ||
99 | /* | |
100 | * For piped output only: | |
101 | * | |
102 | * Each tracer will have a tracer_devpath_head that it will add new | |
103 | * data onto. It's list is protected above (tracer_devpath_head.mutex) | |
104 | * and it will signal the processing thread using the dp_cond, | |
105 | * dp_mutex & dp_entries variables above. | |
106 | */ | |
107 | struct tracer_devpath_head *heads; | |
108 | ||
109 | /* | |
110 | * For network server mode only: | |
111 | */ | |
112 | struct cl_host *ch; | |
113 | u32 cl_id; | |
114 | time_t cl_connect_time; | |
115 | struct io_info *ios; | |
116 | }; | |
117 | ||
118 | /* | |
119 | * For piped output to stdout we will have each tracer thread (one per dev) | |
120 | * tack buffers read from the relay queues on a per-device list. | |
121 | * | |
122 | * The main thread will then collect trace buffers from each of lists in turn. | |
123 | * | |
124 | * We will use a mutex to guard each of the trace_buf list. The tracers | |
125 | * can then signal the main thread using <dp_cond,dp_mutex> and | |
126 | * dp_entries. (When dp_entries is 0, and a tracer adds an entry it will | |
127 | * signal. When dp_entries is 0, the main thread will wait for that condition | |
128 | * to be signalled.) | |
129 | * | |
130 | * adb: It may be better just to have a large buffer per tracer per dev, | |
131 | * and then use it as a ring-buffer. This would certainly cut down a lot | |
132 | * of malloc/free thrashing, at the cost of more memory movements (potentially). | |
133 | */ | |
134 | struct trace_buf { | |
135 | struct list_head head; | |
136 | struct devpath *dpp; | |
137 | void *buf; | |
138 | int cpu, len; | |
139 | }; | |
140 | ||
141 | struct tracer_devpath_head { | |
142 | pthread_mutex_t mutex; | |
143 | struct list_head head; | |
144 | struct trace_buf *prev; | |
145 | }; | |
146 | ||
147 | /* | |
148 | * Used to handle the mmap() interfaces for output file (containing traces) | |
149 | */ | |
150 | struct mmap_info { | |
151 | void *fs_buf; | |
152 | unsigned long long fs_size, fs_max_size, fs_off, fs_buf_len; | |
153 | unsigned long buf_size, buf_nr; | |
154 | int pagesize; | |
155 | }; | |
156 | ||
157 | /* | |
158 | * Each thread doing work on a (client) side of blktrace will have one | |
159 | * of these. The ios array contains input/output information, pfds holds | |
160 | * poll() data. The volatile's provide flags to/from the main executing | |
161 | * thread. | |
162 | */ | |
163 | struct tracer { | |
164 | struct list_head head; | |
165 | struct io_info *ios; | |
166 | struct pollfd *pfds; | |
167 | pthread_t thread; | |
3fe0b570 | 168 | int cpu, nios; |
df81fdb5 | 169 | volatile int status, is_done; |
3fe0b570 AB |
170 | }; |
171 | ||
172 | /* | |
173 | * networking stuff follows. we include a magic number so we know whether | |
174 | * to endianness convert or not. | |
175 | * | |
176 | * The len field is overloaded: | |
177 | * 0 - Indicates an "open" - allowing the server to set up for a dev/cpu | |
178 | * 1 - Indicates a "close" - Shut down connection orderly | |
179 | * | |
180 | * The cpu field is overloaded on close: it will contain the number of drops. | |
181 | */ | |
182 | struct blktrace_net_hdr { | |
183 | u32 magic; /* same as trace magic */ | |
184 | char buts_name[32]; /* trace name */ | |
185 | u32 cpu; /* for which cpu */ | |
186 | u32 max_cpus; | |
187 | u32 len; /* length of following trace data */ | |
188 | u32 cl_id; /* id for set of client per-cpu connections */ | |
189 | u32 buf_size; /* client buf_size for this trace */ | |
190 | u32 buf_nr; /* client buf_nr for this trace */ | |
191 | u32 page_size; /* client page_size for this trace */ | |
192 | }; | |
193 | ||
194 | /* | |
195 | * Each host encountered has one of these. The head is used to link this | |
196 | * on to the network server's ch_list. Connections associated with this | |
197 | * host are linked on conn_list, and any devices traced on that host | |
198 | * are connected on the devpaths list. | |
199 | */ | |
200 | struct cl_host { | |
201 | struct list_head head; | |
202 | struct list_head conn_list; | |
203 | struct list_head devpaths; | |
204 | struct net_server_s *ns; | |
205 | char *hostname; | |
206 | struct in_addr cl_in_addr; | |
207 | int connects, ndevs, cl_opens; | |
208 | }; | |
209 | ||
210 | /* | |
211 | * Each connection (client to server socket ('fd')) has one of these. A | |
212 | * back reference to the host ('ch'), and lists headers (for the host | |
213 | * list, and the network server conn_list) are also included. | |
214 | */ | |
215 | struct cl_conn { | |
216 | struct list_head ch_head, ns_head; | |
217 | struct cl_host *ch; | |
218 | int fd, ncpus; | |
219 | time_t connect_time; | |
220 | }; | |
221 | ||
222 | /* | |
223 | * The network server requires some poll structures to be maintained - | |
224 | * one per conection currently on conn_list. The nchs/ch_list values | |
225 | * are for each host connected to this server. The addr field is used | |
226 | * for scratch as new connections are established. | |
227 | */ | |
228 | struct net_server_s { | |
229 | struct list_head conn_list; | |
230 | struct list_head ch_list; | |
231 | struct pollfd *pfds; | |
232 | int listen_fd, connects, nchs; | |
233 | struct sockaddr_in addr; | |
234 | }; | |
235 | ||
236 | /* | |
237 | * This structure is (generically) used to providide information | |
238 | * for a read-to-write set of values. | |
239 | * | |
240 | * ifn & ifd represent input information | |
241 | * | |
242 | * ofn, ofd, ofp, obuf & mmap_info are used for output file (optionally). | |
243 | */ | |
244 | struct io_info { | |
245 | struct devpath *dpp; | |
246 | FILE *ofp; | |
247 | char *obuf; | |
248 | struct cl_conn *nc; /* Server network connection */ | |
249 | ||
250 | /* | |
251 | * mmap controlled output files | |
252 | */ | |
253 | struct mmap_info mmap_info; | |
254 | ||
255 | /* | |
256 | * Client network fields | |
257 | */ | |
258 | unsigned int ready; | |
259 | unsigned long long data_queued; | |
260 | ||
261 | /* | |
262 | * Input/output file descriptors & names | |
263 | */ | |
264 | int ifd, ofd; | |
265 | char ifn[MAXPATHLEN + 64]; | |
266 | char ofn[MAXPATHLEN + 64]; | |
267 | }; | |
268 | ||
269 | static char blktrace_version[] = "2.0.0"; | |
270 | ||
271 | /* | |
272 | * Linkage to blktrace helper routines (trace conversions) | |
273 | */ | |
274 | int data_is_native = -1; | |
275 | ||
276 | static int ncpus; | |
277 | static int pagesize; | |
278 | static int act_mask = ~0U; | |
279 | static char *debugfs_path = "/sys/kernel/debug"; | |
280 | static char *output_name; | |
281 | static char *output_dir; | |
282 | static int kill_running_trace; | |
283 | static int stop_watch; | |
284 | static unsigned long buf_size = BUF_SIZE; | |
285 | static unsigned long buf_nr = BUF_NR; | |
286 | static LIST_HEAD(devpaths); | |
287 | static LIST_HEAD(tracers); | |
288 | static int ndevs; | |
289 | static volatile int done; | |
290 | static FILE *pfp; | |
291 | static int piped_output; | |
d0ca268b | 292 | |
6488ca48 AB |
293 | /* |
294 | * tracer threads add entries, the main thread takes them off and processes | |
295 | * them. These protect the dp_entries variable. | |
296 | */ | |
3fe0b570 AB |
297 | static pthread_cond_t dp_cond = PTHREAD_COND_INITIALIZER; |
298 | static pthread_mutex_t dp_mutex = PTHREAD_MUTEX_INITIALIZER; | |
299 | static volatile int dp_entries; | |
300 | ||
6488ca48 | 301 | /* |
df81fdb5 | 302 | * These synchronize master / thread interactions. |
6488ca48 | 303 | */ |
df81fdb5 AB |
304 | static pthread_cond_t mt_cond = PTHREAD_COND_INITIALIZER; |
305 | static pthread_mutex_t mt_mutex = PTHREAD_MUTEX_INITIALIZER; | |
306 | static volatile int nthreads_running; | |
307 | static volatile int nthreads_leaving; | |
308 | static volatile int nthreads_error; | |
309 | static volatile int tracers_run; | |
6488ca48 | 310 | |
3fe0b570 AB |
311 | /* |
312 | * network cmd line params | |
313 | */ | |
e58f3937 | 314 | static struct sockaddr_in hostname_addr; |
3fe0b570 AB |
315 | static char hostname[MAXHOSTNAMELEN]; |
316 | static int net_port = TRACE_NET_PORT; | |
317 | static int net_use_sendfile = 1; | |
318 | static int net_mode; | |
319 | static int *cl_fds; | |
007c233c | 320 | |
3fe0b570 AB |
321 | static int (*handle_pfds)(struct tracer *, int, int); |
322 | static int (*handle_list)(struct tracer_devpath_head *, struct list_head *); | |
e3e74029 | 323 | |
5d4f19d9 | 324 | #define S_OPTS "d:a:A:r:o:kw:vVb:n:D:lh:p:sI:" |
d5396421 | 325 | static struct option l_opts[] = { |
5c86134e | 326 | { |
d39c04ca | 327 | .name = "dev", |
428683db | 328 | .has_arg = required_argument, |
d39c04ca AB |
329 | .flag = NULL, |
330 | .val = 'd' | |
331 | }, | |
cf1edb17 AB |
332 | { |
333 | .name = "input-devs", | |
334 | .has_arg = required_argument, | |
335 | .flag = NULL, | |
336 | .val = 'I' | |
337 | }, | |
5c86134e | 338 | { |
d39c04ca | 339 | .name = "act-mask", |
428683db | 340 | .has_arg = required_argument, |
d39c04ca AB |
341 | .flag = NULL, |
342 | .val = 'a' | |
343 | }, | |
5c86134e | 344 | { |
d39c04ca | 345 | .name = "set-mask", |
428683db | 346 | .has_arg = required_argument, |
d39c04ca AB |
347 | .flag = NULL, |
348 | .val = 'A' | |
349 | }, | |
5c86134e | 350 | { |
5270dddd | 351 | .name = "relay", |
428683db | 352 | .has_arg = required_argument, |
5270dddd JA |
353 | .flag = NULL, |
354 | .val = 'r' | |
355 | }, | |
d5396421 JA |
356 | { |
357 | .name = "output", | |
428683db | 358 | .has_arg = required_argument, |
d5396421 JA |
359 | .flag = NULL, |
360 | .val = 'o' | |
361 | }, | |
bc39777c JA |
362 | { |
363 | .name = "kill", | |
428683db | 364 | .has_arg = no_argument, |
bc39777c JA |
365 | .flag = NULL, |
366 | .val = 'k' | |
367 | }, | |
ece238a6 NS |
368 | { |
369 | .name = "stopwatch", | |
428683db | 370 | .has_arg = required_argument, |
ece238a6 NS |
371 | .flag = NULL, |
372 | .val = 'w' | |
373 | }, | |
5d4f19d9 JA |
374 | { |
375 | .name = "version", | |
376 | .has_arg = no_argument, | |
377 | .flag = NULL, | |
378 | .val = 'v' | |
379 | }, | |
52724a0e JA |
380 | { |
381 | .name = "version", | |
382 | .has_arg = no_argument, | |
383 | .flag = NULL, | |
57ea8602 | 384 | .val = 'V' |
52724a0e | 385 | }, |
129aa440 | 386 | { |
3f65c585 | 387 | .name = "buffer-size", |
129aa440 JA |
388 | .has_arg = required_argument, |
389 | .flag = NULL, | |
390 | .val = 'b' | |
391 | }, | |
392 | { | |
3f65c585 | 393 | .name = "num-sub-buffers", |
129aa440 JA |
394 | .has_arg = required_argument, |
395 | .flag = NULL, | |
396 | .val = 'n' | |
397 | }, | |
d1d7f15f | 398 | { |
3f65c585 | 399 | .name = "output-dir", |
d1d7f15f JA |
400 | .has_arg = required_argument, |
401 | .flag = NULL, | |
402 | .val = 'D' | |
403 | }, | |
8e86c98a JA |
404 | { |
405 | .name = "listen", | |
406 | .has_arg = no_argument, | |
407 | .flag = NULL, | |
408 | .val = 'l' | |
409 | }, | |
410 | { | |
411 | .name = "host", | |
412 | .has_arg = required_argument, | |
413 | .flag = NULL, | |
414 | .val = 'h' | |
415 | }, | |
416 | { | |
417 | .name = "port", | |
418 | .has_arg = required_argument, | |
419 | .flag = NULL, | |
420 | .val = 'p' | |
421 | }, | |
32f18c48 | 422 | { |
79971f43 | 423 | .name = "no-sendfile", |
32f18c48 JA |
424 | .has_arg = no_argument, |
425 | .flag = NULL, | |
426 | .val = 's' | |
427 | }, | |
71ef8b7c JA |
428 | { |
429 | .name = NULL, | |
430 | } | |
d39c04ca AB |
431 | }; |
432 | ||
3fe0b570 AB |
433 | static char usage_str[] = \ |
434 | "-d <dev> [ -r debugfs path ] [ -o <output> ] [-k ] [ -w time ]\n" \ | |
435 | "[ -a action ] [ -A action mask ] [ -I <devs file> ] [ -v ]\n\n" \ | |
436 | "\t-d Use specified device. May also be given last after options\n" \ | |
437 | "\t-r Path to mounted debugfs, defaults to /sys/kernel/debug\n" \ | |
438 | "\t-o File(s) to send output to\n" \ | |
439 | "\t-D Directory to prepend to output file names\n" \ | |
440 | "\t-k Kill a running trace\n" \ | |
441 | "\t-w Stop after defined time, in seconds\n" \ | |
442 | "\t-a Only trace specified actions. See documentation\n" \ | |
443 | "\t-A Give trace mask as a single value. See documentation\n" \ | |
444 | "\t-b Sub buffer size in KiB\n" \ | |
445 | "\t-n Number of sub buffers\n" \ | |
446 | "\t-l Run in network listen mode (blktrace server)\n" \ | |
447 | "\t-h Run in network client mode, connecting to the given host\n" \ | |
448 | "\t-p Network port to use (default 8462)\n" \ | |
449 | "\t-s Make the network client NOT use sendfile() to transfer data\n" \ | |
450 | "\t-I Add devices found in <devs file>\n" \ | |
451 | "\t-V Print program version info\n\n"; | |
9db17354 | 452 | |
3fe0b570 AB |
453 | static void clear_events(struct pollfd *pfd) |
454 | { | |
455 | pfd->events = 0; | |
456 | pfd->revents = 0; | |
457 | } | |
21f55651 | 458 | |
3fe0b570 AB |
459 | static inline int net_client_use_sendfile(void) |
460 | { | |
461 | return net_mode == Net_client && net_use_sendfile; | |
462 | } | |
21f55651 | 463 | |
3fe0b570 AB |
464 | static inline int net_client_use_send(void) |
465 | { | |
466 | return net_mode == Net_client && !net_use_sendfile; | |
467 | } | |
b9d4294e | 468 | |
3fe0b570 AB |
469 | static inline int use_tracer_devpaths(void) |
470 | { | |
471 | return piped_output || net_client_use_send(); | |
472 | } | |
b9d4294e | 473 | |
3fe0b570 AB |
474 | static inline int in_addr_eq(struct in_addr a, struct in_addr b) |
475 | { | |
476 | return a.s_addr == b.s_addr; | |
477 | } | |
007c233c | 478 | |
3fe0b570 AB |
479 | static inline void pdc_dr_update(struct devpath *dpp, int cpu, int data_read) |
480 | { | |
481 | dpp->stats[cpu].data_read += data_read; | |
482 | } | |
0cc7d25e | 483 | |
3fe0b570 AB |
484 | static inline void pdc_nev_update(struct devpath *dpp, int cpu, int nevents) |
485 | { | |
486 | dpp->stats[cpu].nevents += nevents; | |
487 | } | |
9db17354 | 488 | |
3fe0b570 AB |
489 | static void show_usage(char *prog) |
490 | { | |
491 | fprintf(stderr, "Usage: %s %s %s", prog, blktrace_version, usage_str); | |
492 | } | |
9db17354 | 493 | |
df81fdb5 AB |
494 | /* |
495 | * Create a timespec 'msec' milliseconds into the future | |
496 | */ | |
497 | static inline void make_timespec(struct timespec *tsp, long delta_msec) | |
498 | { | |
499 | struct timeval now; | |
500 | ||
501 | gettimeofday(&now, NULL); | |
502 | tsp->tv_sec = now.tv_sec; | |
503 | tsp->tv_nsec = 1000L * now.tv_usec; | |
504 | ||
505 | tsp->tv_nsec += (delta_msec * 1000000L); | |
506 | if (tsp->tv_nsec > 1000000000L) { | |
507 | long secs = tsp->tv_nsec / 1000000000L; | |
508 | ||
509 | tsp->tv_sec += secs; | |
510 | tsp->tv_nsec -= (secs * 1000000000L); | |
511 | } | |
512 | } | |
513 | ||
514 | /* | |
515 | * Add a timer to ensure wait ends | |
516 | */ | |
517 | static void t_pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) | |
518 | { | |
519 | struct timespec ts; | |
520 | ||
521 | make_timespec(&ts, 50); | |
522 | pthread_cond_timedwait(cond, mutex, &ts); | |
523 | } | |
524 | ||
525 | static void unblock_tracers(void) | |
526 | { | |
527 | pthread_mutex_lock(&mt_mutex); | |
528 | tracers_run = 1; | |
529 | pthread_cond_broadcast(&mt_cond); | |
530 | pthread_mutex_unlock(&mt_mutex); | |
531 | } | |
532 | ||
533 | static void tracer_wait_unblock(struct tracer *tp) | |
534 | { | |
535 | pthread_mutex_lock(&mt_mutex); | |
536 | while (!tp->is_done && !tracers_run) | |
537 | pthread_cond_wait(&mt_cond, &mt_mutex); | |
538 | pthread_mutex_unlock(&mt_mutex); | |
539 | } | |
540 | ||
541 | static void tracer_signal_ready(struct tracer *tp, | |
542 | enum thread_status th_status, | |
543 | int status) | |
544 | { | |
545 | pthread_mutex_lock(&mt_mutex); | |
546 | tp->status = status; | |
547 | ||
548 | if (th_status == Th_running) | |
549 | nthreads_running++; | |
550 | else if (th_status == Th_error) | |
551 | nthreads_error++; | |
552 | else | |
553 | nthreads_leaving++; | |
554 | ||
555 | pthread_cond_signal(&mt_cond); | |
556 | pthread_mutex_unlock(&mt_mutex); | |
557 | } | |
558 | ||
559 | static void wait_tracers_ready(int ncpus_started) | |
560 | { | |
561 | pthread_mutex_lock(&mt_mutex); | |
562 | while ((nthreads_running + nthreads_error) < ncpus_started) | |
563 | t_pthread_cond_wait(&mt_cond, &mt_mutex); | |
564 | pthread_mutex_unlock(&mt_mutex); | |
565 | } | |
566 | ||
567 | static void wait_tracers_leaving(void) | |
568 | { | |
569 | pthread_mutex_lock(&mt_mutex); | |
570 | while (nthreads_leaving < nthreads_running) | |
571 | t_pthread_cond_wait(&mt_cond, &mt_mutex); | |
572 | pthread_mutex_unlock(&mt_mutex); | |
573 | } | |
574 | ||
3fe0b570 AB |
575 | static void init_mmap_info(struct mmap_info *mip) |
576 | { | |
577 | mip->buf_size = buf_size; | |
578 | mip->buf_nr = buf_nr; | |
579 | mip->pagesize = pagesize; | |
580 | } | |
b7106311 | 581 | |
3fe0b570 AB |
582 | static void net_close_connection(int *fd) |
583 | { | |
584 | shutdown(*fd, SHUT_RDWR); | |
585 | close(*fd); | |
586 | *fd = -1; | |
587 | } | |
ff11d54c | 588 | |
3fe0b570 AB |
589 | static void dpp_free(struct devpath *dpp) |
590 | { | |
591 | if (dpp->stats) | |
592 | free(dpp->stats); | |
593 | if (dpp->ios) | |
594 | free(dpp->ios); | |
595 | if (dpp->path) | |
596 | free(dpp->path); | |
597 | if (dpp->buts_name) | |
598 | free(dpp->buts_name); | |
599 | free(dpp); | |
600 | } | |
d0ca268b | 601 | |
3fe0b570 AB |
602 | static int lock_on_cpu(int cpu) |
603 | { | |
604 | cpu_set_t cpu_mask; | |
ff11d54c | 605 | |
3fe0b570 AB |
606 | CPU_ZERO(&cpu_mask); |
607 | CPU_SET(cpu, &cpu_mask); | |
608 | if (sched_setaffinity(getpid(), sizeof(cpu_mask), &cpu_mask) < 0) | |
609 | return errno; | |
d0ca268b | 610 | |
3fe0b570 AB |
611 | return 0; |
612 | } | |
e7c9f3ff | 613 | |
3fe0b570 AB |
614 | static int increase_limit(int resource, rlim_t increase) |
615 | { | |
616 | struct rlimit rlim; | |
617 | int save_errno = errno; | |
8e86c98a | 618 | |
3fe0b570 AB |
619 | if (!getrlimit(resource, &rlim)) { |
620 | rlim.rlim_cur += increase; | |
621 | if (rlim.rlim_cur >= rlim.rlim_max) | |
622 | rlim.rlim_max = rlim.rlim_cur + increase; | |
72ca8801 | 623 | |
3fe0b570 AB |
624 | if (!setrlimit(resource, &rlim)) |
625 | return 1; | |
626 | } | |
99c1f5ab | 627 | |
3fe0b570 AB |
628 | errno = save_errno; |
629 | return 0; | |
630 | } | |
e0a1988b | 631 | |
3fe0b570 AB |
632 | static int handle_open_failure(void) |
633 | { | |
634 | if (errno == ENFILE || errno == EMFILE) | |
635 | return increase_limit(RLIMIT_NOFILE, 16); | |
636 | return 0; | |
637 | } | |
99c1f5ab | 638 | |
3fe0b570 AB |
639 | static int handle_mem_failure(size_t length) |
640 | { | |
641 | if (errno == ENFILE) | |
642 | return handle_open_failure(); | |
643 | else if (errno == ENOMEM) | |
644 | return increase_limit(RLIMIT_MEMLOCK, 2 * length); | |
645 | return 0; | |
646 | } | |
99c1f5ab | 647 | |
3fe0b570 AB |
648 | static FILE *my_fopen(const char *path, const char *mode) |
649 | { | |
650 | FILE *fp; | |
8e86c98a | 651 | |
3fe0b570 AB |
652 | do { |
653 | fp = fopen(path, mode); | |
654 | } while (fp == NULL && handle_open_failure()); | |
8e86c98a | 655 | |
3fe0b570 AB |
656 | return fp; |
657 | } | |
8e86c98a | 658 | |
3fe0b570 AB |
659 | static int my_open(const char *path, int flags) |
660 | { | |
661 | int fd; | |
8e86c98a | 662 | |
3fe0b570 AB |
663 | do { |
664 | fd = open(path, flags); | |
665 | } while (fd < 0 && handle_open_failure()); | |
e0a1988b | 666 | |
3fe0b570 AB |
667 | return fd; |
668 | } | |
ff11d54c | 669 | |
3fe0b570 AB |
670 | static int my_socket(int domain, int type, int protocol) |
671 | { | |
672 | int fd; | |
ff11d54c | 673 | |
3fe0b570 AB |
674 | do { |
675 | fd = socket(domain, type, protocol); | |
676 | } while (fd < 0 && handle_open_failure()); | |
8e86c98a | 677 | |
3fe0b570 AB |
678 | return fd; |
679 | } | |
680 | ||
d5302b03 AB |
681 | static int my_accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen) |
682 | { | |
683 | int fd; | |
684 | ||
685 | do { | |
686 | fd = accept(sockfd, addr, addrlen); | |
687 | } while (fd < 0 && handle_open_failure()); | |
688 | ||
689 | return fd; | |
690 | } | |
691 | ||
3fe0b570 AB |
692 | static void *my_mmap(void *addr, size_t length, int prot, int flags, int fd, |
693 | off_t offset) | |
69dd57c2 | 694 | { |
3fe0b570 | 695 | void *new; |
69dd57c2 | 696 | |
3fe0b570 AB |
697 | do { |
698 | new = mmap(addr, length, prot, flags, fd, offset); | |
699 | } while (new == MAP_FAILED && handle_mem_failure(length)); | |
700 | ||
701 | return new; | |
702 | } | |
703 | ||
704 | static int my_mlock(const void *addr, size_t len) | |
705 | { | |
706 | int ret; | |
707 | ||
708 | do { | |
709 | ret = mlock(addr, len); | |
710 | } while (ret < 0 && handle_mem_failure(len)); | |
711 | ||
712 | return ret; | |
713 | } | |
714 | ||
715 | static int __stop_trace(int fd) | |
716 | { | |
717 | /* | |
718 | * Should be stopped, don't complain if it isn't | |
719 | */ | |
720 | ioctl(fd, BLKTRACESTOP); | |
721 | return ioctl(fd, BLKTRACETEARDOWN); | |
722 | } | |
723 | ||
724 | static int write_data(char *buf, int len) | |
725 | { | |
726 | int ret; | |
727 | ||
728 | rewrite: | |
729 | ret = fwrite(buf, len, 1, pfp); | |
730 | if (ferror(pfp) || ret != 1) { | |
731 | if (errno == EINTR) { | |
732 | clearerr(pfp); | |
733 | goto rewrite; | |
734 | } | |
735 | ||
736 | if (!piped_output || (errno != EPIPE && errno != EBADF)) { | |
737 | fprintf(stderr, "write(%d) failed: %d/%s\n", | |
738 | len, errno, strerror(errno)); | |
69dd57c2 | 739 | } |
3fe0b570 | 740 | goto err; |
69dd57c2 AB |
741 | } |
742 | ||
3fe0b570 | 743 | fflush(pfp); |
69dd57c2 | 744 | return 0; |
3fe0b570 AB |
745 | |
746 | err: | |
747 | clearerr(pfp); | |
748 | return 1; | |
69dd57c2 AB |
749 | } |
750 | ||
751 | /* | |
3fe0b570 | 752 | * Returns the number of bytes read (successfully) |
69dd57c2 | 753 | */ |
3fe0b570 | 754 | static int __net_recv_data(int fd, void *buf, unsigned int len) |
69dd57c2 | 755 | { |
3fe0b570 AB |
756 | unsigned int bytes_left = len; |
757 | ||
758 | while (bytes_left && !done) { | |
759 | int ret = recv(fd, buf, bytes_left, MSG_WAITALL); | |
760 | ||
761 | if (ret == 0) | |
762 | break; | |
763 | else if (ret < 0) { | |
764 | if (errno != EAGAIN) { | |
765 | perror("server: net_recv_data: recv failed"); | |
766 | break; | |
767 | } else | |
768 | break; | |
769 | } else { | |
770 | buf += ret; | |
771 | bytes_left -= ret; | |
772 | } | |
773 | } | |
69dd57c2 | 774 | |
3fe0b570 | 775 | return len - bytes_left; |
69dd57c2 AB |
776 | } |
777 | ||
3fe0b570 | 778 | static int net_recv_data(int fd, void *buf, unsigned int len) |
8e86c98a | 779 | { |
3fe0b570 AB |
780 | return __net_recv_data(fd, buf, len); |
781 | } | |
7035d92d | 782 | |
3fe0b570 AB |
783 | /* |
784 | * Returns number of bytes written | |
785 | */ | |
786 | static int net_send_data(int fd, void *buf, unsigned int buf_len) | |
787 | { | |
788 | int ret; | |
789 | unsigned int bytes_left = buf_len; | |
790 | ||
791 | while (bytes_left) { | |
792 | ret = send(fd, buf, bytes_left, 0); | |
793 | if (ret < 0) { | |
794 | perror("send"); | |
795 | break; | |
796 | } | |
797 | ||
798 | buf += ret; | |
799 | bytes_left -= ret; | |
7035d92d JA |
800 | } |
801 | ||
3fe0b570 | 802 | return buf_len - bytes_left; |
8e86c98a JA |
803 | } |
804 | ||
3fe0b570 | 805 | static int net_send_header(int fd, int cpu, char *buts_name, int len) |
eb3c8108 | 806 | { |
3fe0b570 | 807 | struct blktrace_net_hdr hdr; |
eb3c8108 | 808 | |
3fe0b570 | 809 | memset(&hdr, 0, sizeof(hdr)); |
eb3c8108 | 810 | |
3fe0b570 AB |
811 | hdr.magic = BLK_IO_TRACE_MAGIC; |
812 | strncpy(hdr.buts_name, buts_name, sizeof(hdr.buts_name)); | |
813 | hdr.buts_name[sizeof(hdr.buts_name)-1] = '\0'; | |
814 | hdr.cpu = cpu; | |
815 | hdr.max_cpus = ncpus; | |
816 | hdr.len = len; | |
817 | hdr.cl_id = getpid(); | |
818 | hdr.buf_size = buf_size; | |
819 | hdr.buf_nr = buf_nr; | |
820 | hdr.page_size = pagesize; | |
eb3c8108 | 821 | |
3fe0b570 AB |
822 | return net_send_data(fd, &hdr, sizeof(hdr)) != sizeof(hdr); |
823 | } | |
eb3c8108 | 824 | |
3fe0b570 AB |
825 | static void net_send_open_close(int fd, int cpu, char *buts_name, int len) |
826 | { | |
827 | struct blktrace_net_hdr ret_hdr; | |
eb3c8108 | 828 | |
3fe0b570 AB |
829 | net_send_header(fd, cpu, buts_name, len); |
830 | net_recv_data(fd, &ret_hdr, sizeof(ret_hdr)); | |
831 | } | |
eb3c8108 | 832 | |
3fe0b570 AB |
833 | static void net_send_open(int fd, int cpu, char *buts_name) |
834 | { | |
835 | net_send_open_close(fd, cpu, buts_name, 0); | |
eb3c8108 JA |
836 | } |
837 | ||
3fe0b570 | 838 | static void net_send_close(int fd, char *buts_name, int drops) |
d0ca268b | 839 | { |
3fe0b570 AB |
840 | /* |
841 | * Overload CPU w/ number of drops | |
842 | * | |
843 | * XXX: Need to clear/set done around call - done=1 (which | |
844 | * is true here) stops reads from happening... :-( | |
845 | */ | |
846 | done = 0; | |
847 | net_send_open_close(fd, drops, buts_name, 1); | |
848 | done = 1; | |
849 | } | |
d0ca268b | 850 | |
3fe0b570 AB |
851 | static void ack_open_close(int fd, char *buts_name) |
852 | { | |
853 | net_send_header(fd, 0, buts_name, 2); | |
854 | } | |
d0ca268b | 855 | |
3fe0b570 AB |
856 | static void net_send_drops(int fd) |
857 | { | |
858 | struct list_head *p; | |
ed71a31e | 859 | |
3fe0b570 AB |
860 | __list_for_each(p, &devpaths) { |
861 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
862 | ||
863 | net_send_close(fd, dpp->buts_name, dpp->drops); | |
d0ca268b | 864 | } |
3fe0b570 | 865 | } |
d0ca268b | 866 | |
3fe0b570 AB |
867 | /* |
868 | * Returns: | |
869 | * 0: "EOF" | |
870 | * 1: OK | |
871 | * -1: Error | |
872 | */ | |
873 | static int net_get_header(struct cl_conn *nc, struct blktrace_net_hdr *bnh) | |
874 | { | |
875 | int bytes_read; | |
876 | int fl = fcntl(nc->fd, F_GETFL); | |
877 | ||
878 | fcntl(nc->fd, F_SETFL, fl | O_NONBLOCK); | |
879 | bytes_read = __net_recv_data(nc->fd, bnh, sizeof(*bnh)); | |
880 | fcntl(nc->fd, F_SETFL, fl & ~O_NONBLOCK); | |
881 | ||
882 | if (bytes_read == sizeof(*bnh)) | |
883 | return 1; | |
884 | else if (bytes_read == 0) | |
885 | return 0; | |
886 | return -1; | |
d0ca268b JA |
887 | } |
888 | ||
e58f3937 | 889 | static int net_setup_addr(void) |
d0ca268b | 890 | { |
e58f3937 | 891 | struct sockaddr_in *addr = &hostname_addr; |
cf9208ea | 892 | |
e58f3937 AB |
893 | memset(addr, 0, sizeof(*addr)); |
894 | addr->sin_family = AF_INET; | |
895 | addr->sin_port = htons(net_port); | |
3fe0b570 | 896 | |
e58f3937 AB |
897 | if (inet_aton(hostname, &addr->sin_addr) != 1) { |
898 | struct hostent *hent; | |
899 | retry: | |
900 | hent = gethostbyname(hostname); | |
3fe0b570 | 901 | if (!hent) { |
e58f3937 AB |
902 | if (h_errno == TRY_AGAIN) { |
903 | usleep(100); | |
904 | goto retry; | |
905 | } else if (h_errno == NO_RECOVERY) { | |
906 | fprintf(stderr, "gethostbyname(%s)" | |
907 | "non-recoverable error encountered\n", | |
908 | hostname); | |
909 | } else { | |
910 | /* | |
911 | * HOST_NOT_FOUND, NO_ADDRESS or NO_DATA | |
912 | */ | |
913 | fprintf(stderr, "Host %s not found\n", | |
914 | hostname); | |
915 | } | |
3fe0b570 AB |
916 | return 1; |
917 | } | |
918 | ||
e58f3937 | 919 | memcpy(&addr->sin_addr, hent->h_addr, 4); |
3fe0b570 AB |
920 | strcpy(hostname, hent->h_name); |
921 | } | |
7035d92d | 922 | |
e58f3937 AB |
923 | return 0; |
924 | } | |
925 | ||
926 | static int net_setup_client(void) | |
927 | { | |
928 | int fd; | |
929 | struct sockaddr_in *addr = &hostname_addr; | |
930 | ||
3fe0b570 AB |
931 | fd = my_socket(AF_INET, SOCK_STREAM, 0); |
932 | if (fd < 0) { | |
933 | perror("client: socket"); | |
934 | return -1; | |
935 | } | |
cf9208ea | 936 | |
e58f3937 | 937 | if (connect(fd, (struct sockaddr *)addr, sizeof(*addr)) < 0) { |
3fe0b570 AB |
938 | if (errno == ECONNREFUSED) |
939 | fprintf(stderr, | |
940 | "\nclient: Connection to %s refused, " | |
941 | "perhaps the server is not started?\n\n", | |
942 | hostname); | |
943 | else | |
944 | perror("client: connect"); | |
945 | close(fd); | |
946 | return -1; | |
707b0914 | 947 | } |
3fe0b570 AB |
948 | |
949 | return fd; | |
d0ca268b JA |
950 | } |
951 | ||
3fe0b570 | 952 | static int open_client_connections(void) |
e7c9f3ff | 953 | { |
3fe0b570 | 954 | int cpu; |
e7c9f3ff | 955 | |
3fe0b570 AB |
956 | cl_fds = calloc(ncpus, sizeof(*cl_fds)); |
957 | for (cpu = 0; cpu < ncpus; cpu++) { | |
958 | cl_fds[cpu] = net_setup_client(); | |
959 | if (cl_fds[cpu] < 0) | |
960 | goto err; | |
eb3c8108 | 961 | } |
3fe0b570 AB |
962 | return 0; |
963 | ||
964 | err: | |
965 | while (cpu > 0) | |
966 | close(cl_fds[cpu--]); | |
967 | free(cl_fds); | |
968 | return 1; | |
e7c9f3ff NS |
969 | } |
970 | ||
3fe0b570 | 971 | static void close_client_connections(void) |
eb3c8108 | 972 | { |
3fe0b570 AB |
973 | if (cl_fds) { |
974 | int cpu, *fdp; | |
eb3c8108 | 975 | |
3fe0b570 AB |
976 | for (cpu = 0, fdp = cl_fds; cpu < ncpus; cpu++, fdp++) { |
977 | if (*fdp >= 0) { | |
978 | net_send_drops(*fdp); | |
979 | net_close_connection(fdp); | |
980 | } | |
7934e668 | 981 | } |
3fe0b570 | 982 | free(cl_fds); |
ff11d54c | 983 | } |
eb3c8108 JA |
984 | } |
985 | ||
3fe0b570 | 986 | static void setup_buts(void) |
d0ca268b | 987 | { |
3fe0b570 | 988 | struct list_head *p; |
bbabf03a | 989 | |
3fe0b570 AB |
990 | __list_for_each(p, &devpaths) { |
991 | struct blk_user_trace_setup buts; | |
992 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
ae9f71b3 | 993 | |
3fe0b570 AB |
994 | memset(&buts, 0, sizeof(buts)); |
995 | buts.buf_size = buf_size; | |
996 | buts.buf_nr = buf_nr; | |
997 | buts.act_mask = act_mask; | |
998 | ||
999 | if (ioctl(dpp->fd, BLKTRACESETUP, &buts) < 0) { | |
1000 | fprintf(stderr, "BLKTRACESETUP(2) %s failed: %d/%s\n", | |
1001 | dpp->path, errno, strerror(errno)); | |
3b552a2d AB |
1002 | } |
1003 | else { | |
1004 | dpp->ncpus = ncpus; | |
1005 | dpp->buts_name = strdup(buts.name); | |
1006 | if (dpp->stats) | |
1007 | free(dpp->stats); | |
1008 | dpp->stats = calloc(dpp->ncpus, sizeof(*dpp->stats)); | |
1009 | memset(dpp->stats, 0, dpp->ncpus * sizeof(*dpp->stats)); | |
1010 | } | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | static void start_buts(void) | |
1015 | { | |
1016 | struct list_head *p; | |
1017 | ||
1018 | __list_for_each(p, &devpaths) { | |
1019 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
1020 | ||
1021 | if (ioctl(dpp->fd, BLKTRACESTART) < 0) { | |
3fe0b570 AB |
1022 | fprintf(stderr, "BLKTRACESTART %s failed: %d/%s\n", |
1023 | dpp->path, errno, strerror(errno)); | |
bbabf03a | 1024 | } |
3fe0b570 | 1025 | } |
8a43bac5 JA |
1026 | } |
1027 | ||
3fe0b570 | 1028 | static int get_drops(struct devpath *dpp) |
8e86c98a | 1029 | { |
3fe0b570 AB |
1030 | int fd, drops = 0; |
1031 | char fn[MAXPATHLEN + 64], tmp[256]; | |
8e86c98a | 1032 | |
3fe0b570 AB |
1033 | snprintf(fn, sizeof(fn), "%s/block/%s/dropped", debugfs_path, |
1034 | dpp->buts_name); | |
8e86c98a | 1035 | |
3fe0b570 AB |
1036 | fd = my_open(fn, O_RDONLY); |
1037 | if (fd < 0) { | |
1038 | /* | |
1039 | * This may be ok: the kernel may not support | |
1040 | * dropped counts. | |
1041 | */ | |
1042 | if (errno != ENOENT) | |
1043 | fprintf(stderr, "Could not open %s: %d/%s\n", | |
1044 | fn, errno, strerror(errno)); | |
1045 | return 0; | |
1046 | } else if (read(fd, tmp, sizeof(tmp)) < 0) { | |
1047 | fprintf(stderr, "Could not read %s: %d/%s\n", | |
1048 | fn, errno, strerror(errno)); | |
1049 | } else | |
1050 | drops = atoi(tmp); | |
1051 | close(fd); | |
8e86c98a | 1052 | |
3fe0b570 | 1053 | return drops; |
8e86c98a JA |
1054 | } |
1055 | ||
3fe0b570 | 1056 | static void get_all_drops(void) |
a3e4d330 | 1057 | { |
3fe0b570 | 1058 | struct list_head *p; |
21f55651 | 1059 | |
3fe0b570 AB |
1060 | __list_for_each(p, &devpaths) { |
1061 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
1062 | dpp->drops = get_drops(dpp); | |
21f55651 | 1063 | } |
9db17354 | 1064 | } |
eb3c8108 | 1065 | |
3fe0b570 | 1066 | static inline struct trace_buf *alloc_trace_buf(int cpu, int bufsize) |
9db17354 | 1067 | { |
3fe0b570 | 1068 | struct trace_buf *tbp; |
21f55651 | 1069 | |
3fe0b570 AB |
1070 | tbp = malloc(sizeof(*tbp) + bufsize); |
1071 | INIT_LIST_HEAD(&tbp->head); | |
1072 | tbp->len = 0; | |
1073 | tbp->buf = (void *)(tbp + 1); | |
1074 | tbp->cpu = cpu; | |
1075 | tbp->dpp = NULL; /* Will be set when tbp is added */ | |
21f55651 | 1076 | |
3fe0b570 | 1077 | return tbp; |
a3e4d330 JA |
1078 | } |
1079 | ||
3fe0b570 | 1080 | static void free_tracer_heads(struct devpath *dpp) |
b7106311 | 1081 | { |
3fe0b570 AB |
1082 | int cpu; |
1083 | struct tracer_devpath_head *hd; | |
b7106311 | 1084 | |
3fe0b570 AB |
1085 | for (cpu = 0, hd = dpp->heads; cpu < ncpus; cpu++, hd++) { |
1086 | if (hd->prev) | |
1087 | free(hd->prev); | |
1088 | pthread_mutex_destroy(&hd->mutex); | |
1089 | } | |
1090 | free(dpp->heads); | |
1091 | } | |
b7106311 | 1092 | |
3fe0b570 AB |
1093 | static int setup_tracer_devpaths(void) |
1094 | { | |
1095 | struct list_head *p; | |
b7106311 | 1096 | |
3fe0b570 AB |
1097 | if (net_client_use_send()) |
1098 | if (open_client_connections()) | |
1099 | return 1; | |
b7106311 | 1100 | |
3fe0b570 AB |
1101 | __list_for_each(p, &devpaths) { |
1102 | int cpu; | |
1103 | struct tracer_devpath_head *hd; | |
1104 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
b7106311 | 1105 | |
3fe0b570 AB |
1106 | dpp->heads = calloc(ncpus, sizeof(struct tracer_devpath_head)); |
1107 | for (cpu = 0, hd = dpp->heads; cpu < ncpus; cpu++, hd++) { | |
1108 | INIT_LIST_HEAD(&hd->head); | |
1109 | pthread_mutex_init(&hd->mutex, NULL); | |
1110 | hd->prev = NULL; | |
1111 | } | |
b7106311 JA |
1112 | } |
1113 | ||
3fe0b570 | 1114 | return 0; |
b7106311 JA |
1115 | } |
1116 | ||
3fe0b570 AB |
1117 | static inline void add_trace_buf(struct devpath *dpp, int cpu, |
1118 | struct trace_buf **tbpp) | |
18eed2a7 | 1119 | { |
3fe0b570 AB |
1120 | struct trace_buf *tbp = *tbpp; |
1121 | struct tracer_devpath_head *hd = &dpp->heads[cpu]; | |
18eed2a7 | 1122 | |
3fe0b570 | 1123 | tbp->dpp = dpp; |
2f064793 | 1124 | |
3fe0b570 AB |
1125 | pthread_mutex_lock(&hd->mutex); |
1126 | list_add_tail(&tbp->head, &hd->head); | |
1127 | pthread_mutex_unlock(&hd->mutex); | |
18eed2a7 | 1128 | |
3fe0b570 | 1129 | *tbpp = alloc_trace_buf(cpu, buf_size); |
18eed2a7 JA |
1130 | } |
1131 | ||
3fe0b570 | 1132 | static inline void incr_entries(int entries_handled) |
a3e4d330 | 1133 | { |
3fe0b570 AB |
1134 | pthread_mutex_lock(&dp_mutex); |
1135 | if (dp_entries == 0) | |
1136 | pthread_cond_signal(&dp_cond); | |
1137 | dp_entries += entries_handled; | |
1138 | pthread_mutex_unlock(&dp_mutex); | |
a3e4d330 JA |
1139 | } |
1140 | ||
3fe0b570 | 1141 | static int add_devpath(char *path) |
8e86c98a | 1142 | { |
3fe0b570 AB |
1143 | int fd; |
1144 | struct devpath *dpp; | |
1145 | ||
8e86c98a | 1146 | /* |
3fe0b570 | 1147 | * Verify device is valid before going too far |
8e86c98a | 1148 | */ |
3fe0b570 AB |
1149 | fd = my_open(path, O_RDONLY | O_NONBLOCK); |
1150 | if (fd < 0) { | |
1151 | fprintf(stderr, "Invalid path %s specified: %d/%s\n", | |
1152 | path, errno, strerror(errno)); | |
1153 | return 1; | |
1154 | } | |
8e86c98a | 1155 | |
3fe0b570 AB |
1156 | dpp = malloc(sizeof(*dpp)); |
1157 | memset(dpp, 0, sizeof(*dpp)); | |
1158 | dpp->path = strdup(path); | |
1159 | dpp->fd = fd; | |
1160 | dpp->idx = ndevs++; | |
1161 | list_add_tail(&dpp->head, &devpaths); | |
8e86c98a | 1162 | |
3fe0b570 | 1163 | return 0; |
8e86c98a JA |
1164 | } |
1165 | ||
3fe0b570 | 1166 | static void rel_devpaths(void) |
a3e4d330 | 1167 | { |
3fe0b570 | 1168 | struct list_head *p, *q; |
a3e4d330 | 1169 | |
3fe0b570 AB |
1170 | list_for_each_safe(p, q, &devpaths) { |
1171 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
a3e4d330 | 1172 | |
3fe0b570 AB |
1173 | list_del(&dpp->head); |
1174 | __stop_trace(dpp->fd); | |
1175 | close(dpp->fd); | |
a3e4d330 | 1176 | |
3fe0b570 AB |
1177 | if (dpp->heads) |
1178 | free_tracer_heads(dpp); | |
a3e4d330 | 1179 | |
3fe0b570 AB |
1180 | dpp_free(dpp); |
1181 | ndevs--; | |
b7106311 | 1182 | } |
8e86c98a | 1183 | } |
b7106311 | 1184 | |
3fe0b570 | 1185 | static int flush_subbuf_net(struct trace_buf *tbp) |
8e86c98a | 1186 | { |
3fe0b570 AB |
1187 | int fd = cl_fds[tbp->cpu]; |
1188 | struct devpath *dpp = tbp->dpp; | |
b7106311 | 1189 | |
3fe0b570 AB |
1190 | if (net_send_header(fd, tbp->cpu, dpp->buts_name, tbp->len)) |
1191 | return 1; | |
8e86c98a | 1192 | |
3fe0b570 AB |
1193 | if (net_send_data(fd, tbp->buf, tbp->len) != tbp->len) |
1194 | return 1; | |
a3e4d330 | 1195 | |
8e86c98a | 1196 | return 0; |
a3e4d330 JA |
1197 | } |
1198 | ||
3fe0b570 AB |
1199 | static int |
1200 | handle_list_net(__attribute__((__unused__))struct tracer_devpath_head *hd, | |
1201 | struct list_head *list) | |
8e86c98a | 1202 | { |
3fe0b570 AB |
1203 | struct trace_buf *tbp; |
1204 | struct list_head *p, *q; | |
1205 | int entries_handled = 0; | |
8e86c98a | 1206 | |
3fe0b570 AB |
1207 | list_for_each_safe(p, q, list) { |
1208 | tbp = list_entry(p, struct trace_buf, head); | |
8e86c98a | 1209 | |
3fe0b570 AB |
1210 | list_del(&tbp->head); |
1211 | entries_handled++; | |
6a752c90 | 1212 | |
3fe0b570 AB |
1213 | if (cl_fds[tbp->cpu] >= 0) { |
1214 | if (flush_subbuf_net(tbp)) { | |
1215 | close(cl_fds[tbp->cpu]); | |
1216 | cl_fds[tbp->cpu] = -1; | |
1217 | } | |
1218 | } | |
7ab2f837 | 1219 | |
3fe0b570 | 1220 | free(tbp); |
7934e668 JA |
1221 | } |
1222 | ||
3fe0b570 | 1223 | return entries_handled; |
6a752c90 JA |
1224 | } |
1225 | ||
3fe0b570 AB |
1226 | static int handle_list_file(struct tracer_devpath_head *hd, |
1227 | struct list_head *list) | |
f6fead25 | 1228 | { |
3fe0b570 AB |
1229 | int off, t_len, nevents; |
1230 | struct blk_io_trace *t; | |
1231 | struct list_head *p, *q; | |
1232 | int entries_handled = 0; | |
1233 | struct trace_buf *tbp, *prev; | |
11629347 | 1234 | |
3fe0b570 AB |
1235 | prev = hd->prev; |
1236 | list_for_each_safe(p, q, list) { | |
1237 | tbp = list_entry(p, struct trace_buf, head); | |
1238 | list_del(&tbp->head); | |
1239 | entries_handled++; | |
18eed2a7 | 1240 | |
3fe0b570 AB |
1241 | /* |
1242 | * If there was some leftover before, tack this new | |
1243 | * entry onto the tail of the previous one. | |
1244 | */ | |
1245 | if (prev) { | |
1246 | unsigned long tot_len; | |
1247 | struct trace_buf *tmp = tbp; | |
1248 | ||
1249 | tbp = prev; | |
1250 | prev = NULL; | |
1251 | ||
1252 | tot_len = tbp->len + tmp->len; | |
1253 | if (tot_len > buf_size) { | |
1254 | /* | |
1255 | * tbp->head isn't connected (it was 'prev' | |
1256 | * so it had been taken off of the list | |
1257 | * before). Therefore, we can realloc | |
1258 | * the whole structures, as the other fields | |
1259 | * are "static". | |
1260 | */ | |
1261 | tbp = realloc(tbp->buf, sizeof(*tbp) + tot_len); | |
1262 | tbp->buf = (void *)(tbp + 1); | |
1263 | } | |
32f18c48 | 1264 | |
3fe0b570 AB |
1265 | memcpy(tbp->buf + tbp->len, tmp->buf, tmp->len); |
1266 | tbp->len = tot_len; | |
32f18c48 | 1267 | |
3fe0b570 AB |
1268 | free(tmp); |
1269 | } | |
ff11d54c | 1270 | |
3fe0b570 AB |
1271 | /* |
1272 | * See how many whole traces there are - send them | |
1273 | * all out in one go. | |
1274 | */ | |
1275 | off = 0; | |
1276 | nevents = 0; | |
1277 | while (off + (int)sizeof(*t) <= tbp->len) { | |
1278 | t = (struct blk_io_trace *)(tbp->buf + off); | |
1279 | t_len = sizeof(*t) + t->pdu_len; | |
1280 | if (off + t_len > tbp->len) | |
1281 | break; | |
ff11d54c | 1282 | |
3fe0b570 AB |
1283 | off += t_len; |
1284 | nevents++; | |
1285 | } | |
1286 | if (nevents) | |
1287 | pdc_nev_update(tbp->dpp, tbp->cpu, nevents); | |
4aeec019 | 1288 | |
3fe0b570 AB |
1289 | /* |
1290 | * Write any full set of traces, any remaining data is kept | |
1291 | * for the next pass. | |
1292 | */ | |
1293 | if (off) { | |
1294 | if (write_data(tbp->buf, off) || off == tbp->len) | |
1295 | free(tbp); | |
1296 | else { | |
1297 | /* | |
1298 | * Move valid data to beginning of buffer | |
1299 | */ | |
1300 | tbp->len -= off; | |
1301 | memmove(tbp->buf, tbp->buf + off, tbp->len); | |
1302 | prev = tbp; | |
1303 | } | |
1304 | } else | |
1305 | prev = tbp; | |
ff11d54c | 1306 | } |
3fe0b570 | 1307 | hd->prev = prev; |
ff11d54c | 1308 | |
3fe0b570 | 1309 | return entries_handled; |
ff11d54c TZ |
1310 | } |
1311 | ||
3fe0b570 | 1312 | static void __process_trace_bufs(void) |
8a43bac5 | 1313 | { |
3fe0b570 AB |
1314 | int cpu; |
1315 | struct list_head *p; | |
1316 | struct list_head list; | |
1317 | int handled = 0; | |
1318 | ||
1319 | __list_for_each(p, &devpaths) { | |
1320 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
1321 | struct tracer_devpath_head *hd = dpp->heads; | |
1322 | ||
1323 | for (cpu = 0; cpu < ncpus; cpu++, hd++) { | |
1324 | pthread_mutex_lock(&hd->mutex); | |
1325 | if (list_empty(&hd->head)) { | |
1326 | pthread_mutex_unlock(&hd->mutex); | |
1327 | continue; | |
1328 | } | |
8a43bac5 | 1329 | |
3fe0b570 AB |
1330 | list_replace_init(&hd->head, &list); |
1331 | pthread_mutex_unlock(&hd->mutex); | |
6480258a | 1332 | |
3fe0b570 AB |
1333 | handled += handle_list(hd, &list); |
1334 | } | |
d0ca268b JA |
1335 | } |
1336 | ||
3fe0b570 AB |
1337 | if (handled) { |
1338 | pthread_mutex_lock(&dp_mutex); | |
1339 | dp_entries -= handled; | |
1340 | pthread_mutex_unlock(&dp_mutex); | |
1341 | } | |
8a43bac5 JA |
1342 | } |
1343 | ||
3fe0b570 | 1344 | static void process_trace_bufs(void) |
8a43bac5 | 1345 | { |
3fe0b570 AB |
1346 | while (!done) { |
1347 | pthread_mutex_lock(&dp_mutex); | |
df81fdb5 AB |
1348 | while (!done && dp_entries == 0) |
1349 | t_pthread_cond_wait(&dp_cond, &dp_mutex); | |
3fe0b570 | 1350 | pthread_mutex_unlock(&dp_mutex); |
3a9d6c13 | 1351 | |
3fe0b570 | 1352 | __process_trace_bufs(); |
3a9d6c13 | 1353 | } |
3fe0b570 | 1354 | } |
3a9d6c13 | 1355 | |
3fe0b570 AB |
1356 | static void clean_trace_bufs(void) |
1357 | { | |
3a9d6c13 | 1358 | /* |
3fe0b570 AB |
1359 | * No mutex needed here: we're only reading from the lists, |
1360 | * tracers are done | |
3a9d6c13 | 1361 | */ |
3fe0b570 AB |
1362 | while (dp_entries) |
1363 | __process_trace_bufs(); | |
1364 | } | |
4b5db44a | 1365 | |
3fe0b570 AB |
1366 | static inline void read_err(int cpu, char *ifn) |
1367 | { | |
1368 | if (errno != EAGAIN) | |
1369 | fprintf(stderr, "Thread %d failed read of %s: %d/%s\n", | |
1370 | cpu, ifn, errno, strerror(errno)); | |
4b5db44a JA |
1371 | } |
1372 | ||
3fe0b570 | 1373 | static int net_sendfile(struct io_info *iop) |
d5396421 | 1374 | { |
3fe0b570 | 1375 | int ret; |
d5396421 | 1376 | |
3fe0b570 AB |
1377 | ret = sendfile(iop->ofd, iop->ifd, NULL, iop->ready); |
1378 | if (ret < 0) { | |
1379 | perror("sendfile"); | |
1380 | return 1; | |
1381 | } else if (ret < (int)iop->ready) { | |
1382 | fprintf(stderr, "short sendfile send (%d of %d)\n", | |
1383 | ret, iop->ready); | |
1384 | return 1; | |
1385 | } | |
91816d54 | 1386 | |
9db17354 | 1387 | return 0; |
91816d54 JA |
1388 | } |
1389 | ||
3fe0b570 | 1390 | static inline int net_sendfile_data(struct tracer *tp, struct io_info *iop) |
d0ca268b | 1391 | { |
3fe0b570 | 1392 | struct devpath *dpp = iop->dpp; |
d0ca268b | 1393 | |
3fe0b570 AB |
1394 | if (net_send_header(iop->ofd, tp->cpu, dpp->buts_name, iop->ready)) |
1395 | return 1; | |
1396 | return net_sendfile(iop); | |
1397 | } | |
d0ca268b | 1398 | |
3fe0b570 AB |
1399 | static int handle_pfds_netclient(struct tracer *tp, int nevs, int force_read) |
1400 | { | |
1401 | struct stat sb; | |
1402 | int i, nentries = 0; | |
1403 | struct pdc_stats *sp; | |
1404 | struct pollfd *pfd = tp->pfds; | |
1405 | struct io_info *iop = tp->ios; | |
1406 | ||
1407 | for (i = 0; nevs > 0 && i < ndevs; i++, pfd++, iop++, sp++) { | |
1408 | if (pfd->revents & POLLIN || force_read) { | |
1409 | if (fstat(iop->ifd, &sb) < 0) { | |
1410 | perror(iop->ifn); | |
1411 | pfd->events = 0; | |
1412 | } else if (sb.st_size > (off_t)iop->data_queued) { | |
1413 | iop->ready = sb.st_size - iop->data_queued; | |
1414 | iop->data_queued = sb.st_size; | |
1415 | if (!net_sendfile_data(tp, iop)) { | |
1416 | pdc_dr_update(iop->dpp, tp->cpu, | |
1417 | iop->ready); | |
1418 | nentries++; | |
1419 | } else | |
1420 | clear_events(pfd); | |
9db17354 | 1421 | } |
3fe0b570 | 1422 | nevs--; |
9db17354 | 1423 | } |
d0ca268b JA |
1424 | } |
1425 | ||
3fe0b570 AB |
1426 | if (nentries) |
1427 | incr_entries(nentries); | |
1428 | ||
1429 | return nentries; | |
d0ca268b JA |
1430 | } |
1431 | ||
3fe0b570 | 1432 | static int handle_pfds_entries(struct tracer *tp, int nevs, int force_read) |
b7106311 | 1433 | { |
3fe0b570 AB |
1434 | int i, nentries = 0; |
1435 | struct trace_buf *tbp; | |
1436 | struct pollfd *pfd = tp->pfds; | |
1437 | struct io_info *iop = tp->ios; | |
1438 | ||
1439 | tbp = alloc_trace_buf(tp->cpu, buf_size); | |
1440 | for (i = 0; i < ndevs; i++, pfd++, iop++) { | |
1441 | if (pfd->revents & POLLIN || force_read) { | |
1442 | tbp->len = read(iop->ifd, tbp->buf, buf_size); | |
1443 | if (tbp->len > 0) { | |
1444 | pdc_dr_update(iop->dpp, tp->cpu, tbp->len); | |
1445 | add_trace_buf(iop->dpp, tp->cpu, &tbp); | |
1446 | nentries++; | |
1447 | } else if (tbp->len == 0) { | |
1448 | /* | |
1449 | * Short reads after we're done stop us | |
1450 | * from trying reads. | |
1451 | */ | |
1452 | if (tp->is_done) | |
1453 | clear_events(pfd); | |
1454 | } else { | |
1455 | read_err(tp->cpu, iop->ifn); | |
1456 | if (errno != EAGAIN || tp->is_done) | |
1457 | clear_events(pfd); | |
1458 | } | |
1459 | if (!piped_output && --nevs == 0) | |
1460 | break; | |
1461 | } | |
b7106311 | 1462 | } |
3fe0b570 | 1463 | free(tbp); |
6a752c90 | 1464 | |
3fe0b570 AB |
1465 | if (nentries) |
1466 | incr_entries(nentries); | |
1467 | ||
1468 | return nentries; | |
b7106311 JA |
1469 | } |
1470 | ||
3fe0b570 | 1471 | static int fill_ofname(struct io_info *iop, int cpu) |
8e86c98a | 1472 | { |
3fe0b570 | 1473 | int len; |
e3bf54d8 | 1474 | struct stat sb; |
3fe0b570 | 1475 | char *dst = iop->ofn; |
8e86c98a JA |
1476 | |
1477 | if (output_dir) | |
3fe0b570 | 1478 | len = snprintf(iop->ofn, sizeof(iop->ofn), "%s/", output_dir); |
dd870ef6 | 1479 | else |
3fe0b570 | 1480 | len = snprintf(iop->ofn, sizeof(iop->ofn), "./"); |
8e86c98a | 1481 | |
e3bf54d8 | 1482 | if (net_mode == Net_server) { |
3fe0b570 | 1483 | struct cl_conn *nc = iop->nc; |
e0a1988b | 1484 | |
3fe0b570 AB |
1485 | len += sprintf(dst + len, "%s-", nc->ch->hostname); |
1486 | len += strftime(dst + len, 64, "%F-%T/", | |
1487 | gmtime(&iop->dpp->cl_connect_time)); | |
e3bf54d8 JA |
1488 | } |
1489 | ||
3fe0b570 | 1490 | if (stat(iop->ofn, &sb) < 0) { |
e3bf54d8 | 1491 | if (errno != ENOENT) { |
3fe0b570 AB |
1492 | fprintf(stderr, |
1493 | "Destination dir %s stat failed: %d/%s\n", | |
1494 | iop->ofn, errno, strerror(errno)); | |
e3bf54d8 JA |
1495 | return 1; |
1496 | } | |
3fe0b570 AB |
1497 | if (mkdir(iop->ofn, 0755) < 0) { |
1498 | fprintf(stderr, | |
1499 | "Destination dir %s can't be made: %d/%s\n", | |
1500 | iop->ofn, errno, strerror(errno)); | |
e3bf54d8 JA |
1501 | return 1; |
1502 | } | |
1503 | } | |
1504 | ||
8e86c98a | 1505 | if (output_name) |
3fe0b570 AB |
1506 | snprintf(iop->ofn + len, sizeof(iop->ofn), "%s.blktrace.%d", |
1507 | output_name, cpu); | |
8e86c98a | 1508 | else |
3fe0b570 AB |
1509 | snprintf(iop->ofn + len, sizeof(iop->ofn), "%s.blktrace.%d", |
1510 | iop->dpp->buts_name, cpu); | |
e3bf54d8 JA |
1511 | |
1512 | return 0; | |
8e86c98a JA |
1513 | } |
1514 | ||
3fe0b570 | 1515 | static int set_vbuf(struct io_info *iop, int mode, size_t size) |
0cc7d25e | 1516 | { |
3fe0b570 AB |
1517 | iop->obuf = malloc(size); |
1518 | if (setvbuf(iop->ofp, iop->obuf, mode, size) < 0) { | |
1519 | fprintf(stderr, "setvbuf(%s, %d) failed: %d/%s\n", | |
1520 | iop->dpp->path, (int)size, errno, | |
1521 | strerror(errno)); | |
1522 | free(iop->obuf); | |
ddf22842 JA |
1523 | return 1; |
1524 | } | |
d5396421 | 1525 | |
ddf22842 JA |
1526 | return 0; |
1527 | } | |
007c233c | 1528 | |
3fe0b570 | 1529 | static int iop_open(struct io_info *iop, int cpu) |
ddf22842 | 1530 | { |
3fe0b570 AB |
1531 | iop->ofd = -1; |
1532 | if (fill_ofname(iop, cpu)) | |
1533 | return 1; | |
0cc7d25e | 1534 | |
3fe0b570 AB |
1535 | iop->ofp = my_fopen(iop->ofn, "w+"); |
1536 | if (iop->ofp == NULL) { | |
1537 | fprintf(stderr, "Open output file %s failed: %d/%s\n", | |
1538 | iop->ofn, errno, strerror(errno)); | |
1539 | return 1; | |
1540 | } | |
1541 | if (set_vbuf(iop, _IOLBF, FILE_VBUF_SIZE)) { | |
1542 | fprintf(stderr, "set_vbuf for file %s failed: %d/%s\n", | |
1543 | iop->ofn, errno, strerror(errno)); | |
1544 | fclose(iop->ofp); | |
1545 | return 1; | |
d0ca268b JA |
1546 | } |
1547 | ||
3fe0b570 | 1548 | iop->ofd = fileno(iop->ofp); |
e7c9f3ff | 1549 | return 0; |
d0ca268b JA |
1550 | } |
1551 | ||
df81fdb5 AB |
1552 | static void close_iop(struct io_info *iop) |
1553 | { | |
1554 | struct mmap_info *mip = &iop->mmap_info; | |
1555 | ||
1556 | if (mip->fs_buf) | |
1557 | munmap(mip->fs_buf, mip->fs_buf_len); | |
1558 | ||
1559 | if (!piped_output) { | |
1560 | if (ftruncate(fileno(iop->ofp), mip->fs_size) < 0) { | |
1561 | fprintf(stderr, | |
1562 | "Ignoring err: ftruncate(%s): %d/%s\n", | |
1563 | iop->ofn, errno, strerror(errno)); | |
1564 | } | |
1565 | } | |
1566 | ||
1567 | if (iop->ofp) | |
1568 | fclose(iop->ofp); | |
1569 | if (iop->obuf) | |
1570 | free(iop->obuf); | |
1571 | } | |
1572 | ||
1573 | static void close_ios(struct tracer *tp) | |
1574 | { | |
1575 | while (tp->nios > 0) { | |
1576 | struct io_info *iop = &tp->ios[--tp->nios]; | |
1577 | ||
1578 | iop->dpp->drops = get_drops(iop->dpp); | |
1579 | if (iop->ifd >= 0) | |
1580 | close(iop->ifd); | |
1581 | ||
1582 | if (iop->ofp) | |
1583 | close_iop(iop); | |
1584 | else if (iop->ofd >= 0) { | |
1585 | struct devpath *dpp = iop->dpp; | |
1586 | ||
1587 | net_send_close(iop->ofd, dpp->buts_name, dpp->drops); | |
1588 | net_close_connection(&iop->ofd); | |
1589 | } | |
1590 | } | |
1591 | ||
1592 | free(tp->ios); | |
1593 | free(tp->pfds); | |
1594 | } | |
1595 | ||
3fe0b570 | 1596 | static int open_ios(struct tracer *tp) |
3aabcd89 | 1597 | { |
3fe0b570 AB |
1598 | struct pollfd *pfd; |
1599 | struct io_info *iop; | |
1600 | struct list_head *p; | |
1601 | ||
1602 | tp->ios = calloc(ndevs, sizeof(struct io_info)); | |
1603 | tp->pfds = calloc(ndevs, sizeof(struct pollfd)); | |
1604 | ||
1605 | memset(tp->ios, 0, ndevs * sizeof(struct io_info)); | |
1606 | memset(tp->pfds, 0, ndevs * sizeof(struct pollfd)); | |
1607 | ||
1608 | tp->nios = 0; | |
1609 | iop = tp->ios; | |
1610 | pfd = tp->pfds; | |
1611 | __list_for_each(p, &devpaths) { | |
1612 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
1613 | ||
1614 | iop->dpp = dpp; | |
1615 | iop->ofd = -1; | |
1616 | snprintf(iop->ifn, sizeof(iop->ifn), "%s/block/%s/trace%d", | |
1617 | debugfs_path, dpp->buts_name, tp->cpu); | |
1618 | ||
1619 | iop->ifd = my_open(iop->ifn, O_RDONLY | O_NONBLOCK); | |
1620 | if (iop->ifd < 0) { | |
1621 | fprintf(stderr, "Thread %d failed open %s: %d/%s\n", | |
1622 | tp->cpu, iop->ifn, errno, strerror(errno)); | |
1623 | return 1; | |
1624 | } | |
1625 | ||
1626 | init_mmap_info(&iop->mmap_info); | |
1627 | ||
1628 | pfd->fd = iop->ifd; | |
1629 | pfd->events = POLLIN; | |
1630 | ||
1631 | if (piped_output) | |
1632 | ; | |
1633 | else if (net_client_use_sendfile()) { | |
1634 | iop->ofd = net_setup_client(); | |
1635 | if (iop->ofd < 0) | |
1636 | goto err; | |
1637 | net_send_open(iop->ofd, tp->cpu, dpp->buts_name); | |
1638 | } else if (net_mode == Net_none) { | |
1639 | if (iop_open(iop, tp->cpu)) | |
1640 | goto err; | |
1641 | } else { | |
1642 | /* | |
1643 | * This ensures that the server knows about all | |
1644 | * connections & devices before _any_ closes | |
1645 | */ | |
1646 | net_send_open(cl_fds[tp->cpu], tp->cpu, dpp->buts_name); | |
1647 | } | |
007c233c | 1648 | |
3fe0b570 AB |
1649 | pfd++; |
1650 | iop++; | |
1651 | tp->nios++; | |
9db17354 | 1652 | } |
3aabcd89 | 1653 | |
3fe0b570 | 1654 | return 0; |
72ca8801 | 1655 | |
3fe0b570 AB |
1656 | err: |
1657 | close(iop->ifd); /* tp->nios _not_ bumped */ | |
df81fdb5 | 1658 | close_ios(tp); |
3fe0b570 | 1659 | return 1; |
e7c9f3ff NS |
1660 | } |
1661 | ||
3fe0b570 | 1662 | static int setup_mmap(int fd, unsigned int maxlen, struct mmap_info *mip) |
e7c9f3ff | 1663 | { |
3fe0b570 AB |
1664 | if (mip->fs_off + maxlen > mip->fs_buf_len) { |
1665 | unsigned long nr = max(16, mip->buf_nr); | |
e7c9f3ff | 1666 | |
3fe0b570 AB |
1667 | if (mip->fs_buf) { |
1668 | munlock(mip->fs_buf, mip->fs_buf_len); | |
1669 | munmap(mip->fs_buf, mip->fs_buf_len); | |
1670 | mip->fs_buf = NULL; | |
e7c9f3ff | 1671 | } |
99c1f5ab | 1672 | |
3fe0b570 AB |
1673 | mip->fs_off = mip->fs_size & (mip->pagesize - 1); |
1674 | mip->fs_buf_len = (nr * mip->buf_size) - mip->fs_off; | |
1675 | mip->fs_max_size += mip->fs_buf_len; | |
e7c9f3ff | 1676 | |
3fe0b570 AB |
1677 | if (ftruncate(fd, mip->fs_max_size) < 0) { |
1678 | perror("__setup_mmap: ftruncate"); | |
1679 | return 1; | |
e7c9f3ff | 1680 | } |
99c1f5ab | 1681 | |
3fe0b570 AB |
1682 | mip->fs_buf = my_mmap(NULL, mip->fs_buf_len, PROT_WRITE, |
1683 | MAP_SHARED, fd, | |
1684 | mip->fs_size - mip->fs_off); | |
1685 | if (mip->fs_buf == MAP_FAILED) { | |
1686 | perror("__setup_mmap: mmap"); | |
1687 | return 1; | |
1688 | } | |
1689 | my_mlock(mip->fs_buf, mip->fs_buf_len); | |
d0ca268b JA |
1690 | } |
1691 | ||
e7c9f3ff | 1692 | return 0; |
d0ca268b JA |
1693 | } |
1694 | ||
3fe0b570 | 1695 | static int handle_pfds_file(struct tracer *tp, int nevs, int force_read) |
e7c9f3ff | 1696 | { |
3fe0b570 AB |
1697 | struct mmap_info *mip; |
1698 | int i, ret, nentries = 0; | |
1699 | struct pollfd *pfd = tp->pfds; | |
1700 | struct io_info *iop = tp->ios; | |
1701 | ||
1702 | for (i = 0; nevs > 0 && i < ndevs; i++, pfd++, iop++) { | |
1703 | if (pfd->revents & POLLIN || force_read) { | |
1704 | mip = &iop->mmap_info; | |
1705 | ||
1706 | ret = setup_mmap(iop->ofd, buf_size, mip); | |
1707 | if (ret < 0) { | |
1708 | pfd->events = 0; | |
1709 | break; | |
1710 | } | |
428683db | 1711 | |
3fe0b570 AB |
1712 | ret = read(iop->ifd, mip->fs_buf + mip->fs_off, |
1713 | buf_size); | |
1714 | if (ret > 0) { | |
1715 | pdc_dr_update(iop->dpp, tp->cpu, ret); | |
1716 | mip->fs_size += ret; | |
1717 | mip->fs_off += ret; | |
1718 | nentries++; | |
1719 | } else if (ret == 0) { | |
1720 | /* | |
1721 | * Short reads after we're done stop us | |
1722 | * from trying reads. | |
1723 | */ | |
1724 | if (tp->is_done) | |
1725 | clear_events(pfd); | |
1726 | } else { | |
1727 | read_err(tp->cpu, iop->ifn); | |
1728 | if (errno != EAGAIN || tp->is_done) | |
1729 | clear_events(pfd); | |
1730 | } | |
1731 | nevs--; | |
e7c9f3ff | 1732 | } |
e7c9f3ff | 1733 | } |
56070ea4 | 1734 | |
3fe0b570 | 1735 | return nentries; |
e7c9f3ff | 1736 | } |
52724a0e | 1737 | |
3fe0b570 | 1738 | static void *thread_main(void *arg) |
8e86c98a | 1739 | { |
df81fdb5 | 1740 | int ret, ndone, to_val; |
3fe0b570 | 1741 | struct tracer *tp = arg; |
8e86c98a | 1742 | |
3fe0b570 AB |
1743 | ret = lock_on_cpu(tp->cpu); |
1744 | if (ret) | |
1745 | goto err; | |
ff11d54c | 1746 | |
3fe0b570 | 1747 | ret = open_ios(tp); |
df81fdb5 | 1748 | if (ret) |
3fe0b570 | 1749 | goto err; |
6a6d3f0f | 1750 | |
3fe0b570 AB |
1751 | if (piped_output) |
1752 | to_val = 50; /* Frequent partial handles */ | |
ff11d54c | 1753 | else |
3fe0b570 AB |
1754 | to_val = 500; /* 1/2 second intervals */ |
1755 | ||
df81fdb5 AB |
1756 | |
1757 | tracer_signal_ready(tp, Th_running, 0); | |
1758 | tracer_wait_unblock(tp); | |
6488ca48 | 1759 | |
3fe0b570 AB |
1760 | while (!tp->is_done) { |
1761 | ndone = poll(tp->pfds, ndevs, to_val); | |
1762 | if (ndone || piped_output) | |
1763 | (void)handle_pfds(tp, ndone, piped_output); | |
1764 | else if (ndone < 0 && errno != EINTR) | |
1765 | fprintf(stderr, "Thread %d poll failed: %d/%s\n", | |
1766 | tp->cpu, errno, strerror(errno)); | |
1767 | } | |
22cd0c02 JA |
1768 | |
1769 | /* | |
3fe0b570 | 1770 | * Trace is stopped, pull data until we get a short read |
22cd0c02 | 1771 | */ |
3fe0b570 AB |
1772 | while (handle_pfds(tp, ndevs, 1) > 0) |
1773 | ; | |
3fe0b570 | 1774 | close_ios(tp); |
df81fdb5 AB |
1775 | tracer_signal_ready(tp, Th_leaving, 0); |
1776 | return NULL; | |
8e86c98a | 1777 | |
3fe0b570 | 1778 | err: |
df81fdb5 | 1779 | tracer_signal_ready(tp, Th_error, ret); |
3fe0b570 | 1780 | return NULL; |
22cd0c02 JA |
1781 | } |
1782 | ||
3fe0b570 | 1783 | static int start_tracer(int cpu) |
22cd0c02 | 1784 | { |
3fe0b570 | 1785 | struct tracer *tp; |
22cd0c02 | 1786 | |
3fe0b570 AB |
1787 | tp = malloc(sizeof(*tp)); |
1788 | memset(tp, 0, sizeof(*tp)); | |
7ab2f837 | 1789 | |
3fe0b570 | 1790 | INIT_LIST_HEAD(&tp->head); |
3fe0b570 AB |
1791 | tp->status = 0; |
1792 | tp->cpu = cpu; | |
8e86c98a | 1793 | |
3fe0b570 AB |
1794 | if (pthread_create(&tp->thread, NULL, thread_main, tp)) { |
1795 | fprintf(stderr, "FAILED to start thread on CPU %d: %d/%s\n", | |
1796 | cpu, errno, strerror(errno)); | |
df81fdb5 AB |
1797 | free(tp); |
1798 | return 1; | |
8e86c98a | 1799 | } |
3fe0b570 | 1800 | |
df81fdb5 AB |
1801 | list_add_tail(&tp->head, &tracers); |
1802 | return 0; | |
8e86c98a JA |
1803 | } |
1804 | ||
df81fdb5 | 1805 | static void start_tracers(void) |
e0a1988b | 1806 | { |
3fe0b570 | 1807 | int cpu; |
df81fdb5 | 1808 | struct list_head *p; |
3fe0b570 AB |
1809 | |
1810 | for (cpu = 0; cpu < ncpus; cpu++) | |
1811 | if (start_tracer(cpu)) | |
1812 | break; | |
e0a1988b | 1813 | |
df81fdb5 AB |
1814 | wait_tracers_ready(cpu); |
1815 | ||
1816 | __list_for_each(p, &tracers) { | |
1817 | struct tracer *tp = list_entry(p, struct tracer, head); | |
1818 | if (tp->status) | |
1819 | fprintf(stderr, | |
1820 | "FAILED to start thread on CPU %d: %d/%s\n", | |
1821 | tp->cpu, tp->status, strerror(tp->status)); | |
1822 | } | |
3fe0b570 | 1823 | } |
e0a1988b | 1824 | |
3fe0b570 AB |
1825 | static void stop_tracers(void) |
1826 | { | |
1827 | struct list_head *p; | |
e0a1988b JA |
1828 | |
1829 | /* | |
3fe0b570 | 1830 | * Stop the tracing - makes the tracer threads clean up quicker. |
e0a1988b | 1831 | */ |
3fe0b570 AB |
1832 | __list_for_each(p, &devpaths) { |
1833 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
1834 | (void)ioctl(dpp->fd, BLKTRACESTOP); | |
e0a1988b JA |
1835 | } |
1836 | ||
3fe0b570 AB |
1837 | /* |
1838 | * Tell each tracer to quit | |
1839 | */ | |
1840 | __list_for_each(p, &tracers) { | |
1841 | struct tracer *tp = list_entry(p, struct tracer, head); | |
1842 | tp->is_done = 1; | |
1843 | } | |
ff11d54c | 1844 | } |
e0a1988b | 1845 | |
3fe0b570 | 1846 | static void del_tracers(void) |
ff11d54c | 1847 | { |
3fe0b570 | 1848 | struct list_head *p, *q; |
ff11d54c | 1849 | |
3fe0b570 AB |
1850 | list_for_each_safe(p, q, &tracers) { |
1851 | struct tracer *tp = list_entry(p, struct tracer, head); | |
ff11d54c | 1852 | |
3fe0b570 AB |
1853 | list_del(&tp->head); |
1854 | free(tp); | |
e0a1988b | 1855 | } |
ff11d54c | 1856 | } |
e0a1988b | 1857 | |
3fe0b570 | 1858 | static void wait_tracers(void) |
ff11d54c | 1859 | { |
3fe0b570 | 1860 | struct list_head *p; |
ff11d54c | 1861 | |
3fe0b570 AB |
1862 | if (use_tracer_devpaths()) |
1863 | process_trace_bufs(); | |
1864 | ||
df81fdb5 AB |
1865 | wait_tracers_leaving(); |
1866 | ||
3fe0b570 AB |
1867 | __list_for_each(p, &tracers) { |
1868 | int ret; | |
1869 | struct tracer *tp = list_entry(p, struct tracer, head); | |
1870 | ||
3fe0b570 AB |
1871 | ret = pthread_join(tp->thread, NULL); |
1872 | if (ret) | |
1873 | fprintf(stderr, "Thread join %d failed %d\n", | |
1874 | tp->cpu, ret); | |
ff11d54c TZ |
1875 | } |
1876 | ||
3fe0b570 AB |
1877 | if (use_tracer_devpaths()) |
1878 | clean_trace_bufs(); | |
1879 | ||
1880 | get_all_drops(); | |
ff11d54c TZ |
1881 | } |
1882 | ||
3fe0b570 | 1883 | static void exit_tracing(void) |
ff11d54c | 1884 | { |
3fe0b570 AB |
1885 | signal(SIGINT, SIG_IGN); |
1886 | signal(SIGHUP, SIG_IGN); | |
1887 | signal(SIGTERM, SIG_IGN); | |
1888 | signal(SIGALRM, SIG_IGN); | |
1889 | ||
1890 | stop_tracers(); | |
1891 | wait_tracers(); | |
1892 | del_tracers(); | |
1893 | rel_devpaths(); | |
e0a1988b JA |
1894 | } |
1895 | ||
3fe0b570 | 1896 | static void handle_sigint(__attribute__((__unused__)) int sig) |
8e86c98a | 1897 | { |
3fe0b570 AB |
1898 | done = 1; |
1899 | stop_tracers(); | |
8e86c98a JA |
1900 | } |
1901 | ||
3fe0b570 | 1902 | static void show_stats(struct list_head *devpaths) |
659bcc3f | 1903 | { |
3fe0b570 AB |
1904 | FILE *ofp; |
1905 | struct list_head *p; | |
1906 | unsigned long long nevents, data_read; | |
1907 | unsigned long long total_drops = 0; | |
1908 | unsigned long long total_events = 0; | |
1909 | ||
1910 | if (piped_output) | |
1911 | ofp = my_fopen("/dev/null", "w"); | |
1912 | else | |
1913 | ofp = stdout; | |
ff11d54c | 1914 | |
3fe0b570 AB |
1915 | __list_for_each(p, devpaths) { |
1916 | int cpu; | |
1917 | struct pdc_stats *sp; | |
1918 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
e0a1988b | 1919 | |
3fe0b570 AB |
1920 | if (net_mode == Net_server) |
1921 | printf("server: end of run for %s:%s\n", | |
1922 | dpp->ch->hostname, dpp->buts_name); | |
e0a1988b | 1923 | |
3fe0b570 AB |
1924 | data_read = 0; |
1925 | nevents = 0; | |
1926 | ||
1927 | fprintf(ofp, "=== %s ===\n", dpp->buts_name); | |
1928 | for (cpu = 0, sp = dpp->stats; cpu < dpp->ncpus; cpu++, sp++) { | |
1929 | /* | |
1930 | * Estimate events if not known... | |
1931 | */ | |
1932 | if (sp->nevents == 0) { | |
1933 | sp->nevents = sp->data_read / | |
1934 | sizeof(struct blk_io_trace); | |
ff11d54c | 1935 | } |
e0a1988b | 1936 | |
3fe0b570 AB |
1937 | fprintf(ofp, |
1938 | " CPU%3d: %20llu events, %8llu KiB data\n", | |
1939 | cpu, sp->nevents, (sp->data_read + 1023) >> 10); | |
e0a1988b | 1940 | |
3fe0b570 AB |
1941 | data_read += sp->data_read; |
1942 | nevents += sp->nevents; | |
e0a1988b JA |
1943 | } |
1944 | ||
3fe0b570 AB |
1945 | fprintf(ofp, " Total: %20llu events (dropped %llu)," |
1946 | " %8llu KiB data\n", nevents, | |
1947 | dpp->drops, (data_read + 1024) >> 10); | |
8e86c98a | 1948 | |
3fe0b570 AB |
1949 | total_drops += dpp->drops; |
1950 | total_events += (nevents + dpp->drops); | |
8e86c98a JA |
1951 | } |
1952 | ||
3fe0b570 AB |
1953 | fflush(ofp); |
1954 | if (piped_output) | |
1955 | fclose(ofp); | |
8e86c98a | 1956 | |
3fe0b570 AB |
1957 | if (total_drops) { |
1958 | double drops_ratio = 1.0; | |
8e86c98a | 1959 | |
3fe0b570 AB |
1960 | if (total_events) |
1961 | drops_ratio = (double)total_drops/(double)total_events; | |
8e86c98a | 1962 | |
3fe0b570 AB |
1963 | fprintf(stderr, "\nYou have %llu (%5.1lf%%) dropped events\n" |
1964 | "Consider using a larger buffer size (-b) " | |
1965 | "and/or more buffers (-n)\n", | |
1966 | total_drops, 100.0 * drops_ratio); | |
8e86c98a | 1967 | } |
8e86c98a JA |
1968 | } |
1969 | ||
3fe0b570 | 1970 | static int handle_args(int argc, char *argv[]) |
8e86c98a | 1971 | { |
3fe0b570 | 1972 | int c, i; |
e3e74029 | 1973 | struct statfs st; |
d39c04ca AB |
1974 | int act_mask_tmp = 0; |
1975 | ||
1976 | while ((c = getopt_long(argc, argv, S_OPTS, l_opts, NULL)) >= 0) { | |
1977 | switch (c) { | |
1978 | case 'a': | |
1979 | i = find_mask_map(optarg); | |
1980 | if (i < 0) { | |
3fe0b570 | 1981 | fprintf(stderr, "Invalid action mask %s\n", |
d39c04ca | 1982 | optarg); |
7425d456 | 1983 | return 1; |
d39c04ca AB |
1984 | } |
1985 | act_mask_tmp |= i; | |
1986 | break; | |
1987 | ||
1988 | case 'A': | |
3fe0b570 | 1989 | if ((sscanf(optarg, "%x", &i) != 1) || |
98f8386b | 1990 | !valid_act_opt(i)) { |
d39c04ca | 1991 | fprintf(stderr, |
ab197ca7 | 1992 | "Invalid set action mask %s/0x%x\n", |
d39c04ca | 1993 | optarg, i); |
7425d456 | 1994 | return 1; |
d39c04ca AB |
1995 | } |
1996 | act_mask_tmp = i; | |
1997 | break; | |
d0ca268b | 1998 | |
d39c04ca | 1999 | case 'd': |
3fe0b570 | 2000 | if (add_devpath(optarg) != 0) |
e7c9f3ff | 2001 | return 1; |
d39c04ca AB |
2002 | break; |
2003 | ||
cf1edb17 AB |
2004 | case 'I': { |
2005 | char dev_line[256]; | |
3fe0b570 | 2006 | FILE *ifp = my_fopen(optarg, "r"); |
cf1edb17 AB |
2007 | |
2008 | if (!ifp) { | |
3fe0b570 AB |
2009 | fprintf(stderr, |
2010 | "Invalid file for devices %s\n", | |
cf1edb17 AB |
2011 | optarg); |
2012 | return 1; | |
2013 | } | |
2014 | ||
2015 | while (fscanf(ifp, "%s\n", dev_line) == 1) | |
3fe0b570 | 2016 | if (add_devpath(dev_line) != 0) |
cf1edb17 AB |
2017 | return 1; |
2018 | break; | |
2019 | } | |
cf1edb17 | 2020 | |
5270dddd | 2021 | case 'r': |
3d06efea | 2022 | debugfs_path = optarg; |
5270dddd JA |
2023 | break; |
2024 | ||
d5396421 | 2025 | case 'o': |
66efebf8 | 2026 | output_name = optarg; |
d5396421 | 2027 | break; |
bc39777c JA |
2028 | case 'k': |
2029 | kill_running_trace = 1; | |
2030 | break; | |
ece238a6 NS |
2031 | case 'w': |
2032 | stop_watch = atoi(optarg); | |
2033 | if (stop_watch <= 0) { | |
2034 | fprintf(stderr, | |
2035 | "Invalid stopwatch value (%d secs)\n", | |
2036 | stop_watch); | |
2037 | return 1; | |
2038 | } | |
2039 | break; | |
57ea8602 | 2040 | case 'V': |
5d4f19d9 | 2041 | case 'v': |
52724a0e | 2042 | printf("%s version %s\n", argv[0], blktrace_version); |
3fe0b570 AB |
2043 | exit(0); |
2044 | /*NOTREACHED*/ | |
129aa440 | 2045 | case 'b': |
eb3c8108 | 2046 | buf_size = strtoul(optarg, NULL, 10); |
183a0855 | 2047 | if (buf_size <= 0 || buf_size > 16*1024) { |
3fe0b570 AB |
2048 | fprintf(stderr, "Invalid buffer size (%lu)\n", |
2049 | buf_size); | |
129aa440 JA |
2050 | return 1; |
2051 | } | |
2052 | buf_size <<= 10; | |
2053 | break; | |
2054 | case 'n': | |
eb3c8108 | 2055 | buf_nr = strtoul(optarg, NULL, 10); |
129aa440 JA |
2056 | if (buf_nr <= 0) { |
2057 | fprintf(stderr, | |
eb3c8108 | 2058 | "Invalid buffer nr (%lu)\n", buf_nr); |
129aa440 JA |
2059 | return 1; |
2060 | } | |
2061 | break; | |
d1d7f15f JA |
2062 | case 'D': |
2063 | output_dir = optarg; | |
2064 | break; | |
8e86c98a JA |
2065 | case 'h': |
2066 | net_mode = Net_client; | |
2067 | strcpy(hostname, optarg); | |
2068 | break; | |
2069 | case 'l': | |
2070 | net_mode = Net_server; | |
2071 | break; | |
2072 | case 'p': | |
2073 | net_port = atoi(optarg); | |
2074 | break; | |
32f18c48 | 2075 | case 's': |
79971f43 | 2076 | net_use_sendfile = 0; |
32f18c48 | 2077 | break; |
d39c04ca | 2078 | default: |
ee1f4158 | 2079 | show_usage(argv[0]); |
3fe0b570 AB |
2080 | exit(1); |
2081 | /*NOTREACHED*/ | |
d39c04ca AB |
2082 | } |
2083 | } | |
2084 | ||
3fe0b570 AB |
2085 | while (optind < argc) |
2086 | if (add_devpath(argv[optind++]) != 0) | |
2087 | return 1; | |
8e86c98a | 2088 | |
3fe0b570 AB |
2089 | if (net_mode != Net_server && ndevs == 0) { |
2090 | show_usage(argv[0]); | |
2091 | return 1; | |
2092 | } | |
8e86c98a | 2093 | |
3fe0b570 AB |
2094 | if (statfs(debugfs_path, &st) < 0 || st.f_type != (long)DEBUGFS_TYPE) { |
2095 | fprintf(stderr, "Invalid debug path %s: %d/%s\n", | |
2096 | debugfs_path, errno, strerror(errno)); | |
2097 | return 1; | |
2098 | } | |
2099 | ||
2100 | if (act_mask_tmp != 0) | |
2101 | act_mask = act_mask_tmp; | |
2102 | ||
e58f3937 AB |
2103 | if (net_mode == Net_client && net_setup_addr()) |
2104 | return 1; | |
2105 | ||
3fe0b570 AB |
2106 | /* |
2107 | * Set up for appropriate PFD handler based upon output name. | |
2108 | */ | |
2109 | if (net_client_use_sendfile()) | |
2110 | handle_pfds = handle_pfds_netclient; | |
2111 | else if (net_client_use_send()) | |
2112 | handle_pfds = handle_pfds_entries; | |
2113 | else if (output_name && (strcmp(output_name, "-") == 0)) { | |
2114 | piped_output = 1; | |
2115 | handle_pfds = handle_pfds_entries; | |
2116 | pfp = stdout; | |
2117 | setvbuf(pfp, NULL, _IONBF, 0); | |
2118 | } else | |
2119 | handle_pfds = handle_pfds_file; | |
2120 | return 0; | |
2121 | } | |
2122 | ||
2123 | static void ch_add_connection(struct net_server_s *ns, struct cl_host *ch, | |
2124 | int fd) | |
2125 | { | |
2126 | struct cl_conn *nc; | |
2127 | ||
2128 | nc = malloc(sizeof(*nc)); | |
2129 | memset(nc, 0, sizeof(*nc)); | |
2130 | ||
2131 | time(&nc->connect_time); | |
2132 | nc->ch = ch; | |
2133 | nc->fd = fd; | |
2134 | nc->ncpus = -1; | |
2135 | ||
2136 | list_add_tail(&nc->ch_head, &ch->conn_list); | |
2137 | ch->connects++; | |
2138 | ||
2139 | list_add_tail(&nc->ns_head, &ns->conn_list); | |
2140 | ns->connects++; | |
2141 | ns->pfds = realloc(ns->pfds, (ns->connects+1) * sizeof(struct pollfd)); | |
2142 | } | |
2143 | ||
2144 | static void ch_rem_connection(struct net_server_s *ns, struct cl_host *ch, | |
2145 | struct cl_conn *nc) | |
2146 | { | |
2147 | net_close_connection(&nc->fd); | |
2148 | ||
2149 | list_del(&nc->ch_head); | |
2150 | ch->connects--; | |
2151 | ||
2152 | list_del(&nc->ns_head); | |
2153 | ns->connects--; | |
2154 | ns->pfds = realloc(ns->pfds, (ns->connects+1) * sizeof(struct pollfd)); | |
2155 | ||
2156 | free(nc); | |
2157 | } | |
2158 | ||
2159 | static struct cl_host *net_find_client_host(struct net_server_s *ns, | |
2160 | struct in_addr cl_in_addr) | |
2161 | { | |
2162 | struct list_head *p; | |
2163 | ||
2164 | __list_for_each(p, &ns->ch_list) { | |
2165 | struct cl_host *ch = list_entry(p, struct cl_host, head); | |
2166 | ||
2167 | if (in_addr_eq(ch->cl_in_addr, cl_in_addr)) | |
2168 | return ch; | |
2169 | } | |
2170 | ||
2171 | return NULL; | |
2172 | } | |
2173 | ||
2174 | static struct cl_host *net_add_client_host(struct net_server_s *ns, | |
2175 | struct sockaddr_in *addr) | |
2176 | { | |
2177 | struct cl_host *ch; | |
2178 | ||
2179 | ch = malloc(sizeof(*ch)); | |
2180 | memset(ch, 0, sizeof(*ch)); | |
2181 | ||
2182 | ch->ns = ns; | |
2183 | ch->cl_in_addr = addr->sin_addr; | |
2184 | list_add_tail(&ch->head, &ns->ch_list); | |
2185 | ns->nchs++; | |
ec685dd2 | 2186 | |
3fe0b570 AB |
2187 | ch->hostname = strdup(inet_ntoa(addr->sin_addr)); |
2188 | printf("server: connection from %s\n", ch->hostname); | |
2189 | ||
2190 | INIT_LIST_HEAD(&ch->conn_list); | |
2191 | INIT_LIST_HEAD(&ch->devpaths); | |
2192 | ||
2193 | return ch; | |
2194 | } | |
2195 | ||
2196 | static void device_done(struct devpath *dpp, int ncpus) | |
2197 | { | |
2198 | int cpu; | |
2199 | struct io_info *iop; | |
2200 | ||
2201 | for (cpu = 0, iop = dpp->ios; cpu < ncpus; cpu++, iop++) | |
2202 | close_iop(iop); | |
2203 | ||
2204 | list_del(&dpp->head); | |
2205 | dpp_free(dpp); | |
2206 | } | |
2207 | ||
2208 | static void net_ch_remove(struct cl_host *ch, int ncpus) | |
2209 | { | |
2210 | struct list_head *p, *q; | |
2211 | struct net_server_s *ns = ch->ns; | |
2212 | ||
2213 | list_for_each_safe(p, q, &ch->devpaths) { | |
2214 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
2215 | device_done(dpp, ncpus); | |
ec685dd2 | 2216 | } |
8e86c98a | 2217 | |
3fe0b570 AB |
2218 | list_for_each_safe(p, q, &ch->conn_list) { |
2219 | struct cl_conn *nc = list_entry(p, struct cl_conn, ch_head); | |
2220 | ||
2221 | ch_rem_connection(ns, ch, nc); | |
22cd0c02 JA |
2222 | } |
2223 | ||
3fe0b570 AB |
2224 | list_del(&ch->head); |
2225 | ns->nchs--; | |
2226 | ||
2227 | if (ch->hostname) | |
2228 | free(ch->hostname); | |
2229 | free(ch); | |
2230 | } | |
2231 | ||
2232 | static void net_add_connection(struct net_server_s *ns) | |
2233 | { | |
2234 | int fd; | |
2235 | struct cl_host *ch; | |
2236 | socklen_t socklen = sizeof(ns->addr); | |
2237 | ||
d5302b03 | 2238 | fd = my_accept(ns->listen_fd, (struct sockaddr *)&ns->addr, &socklen); |
3fe0b570 AB |
2239 | if (fd < 0) { |
2240 | /* | |
2241 | * This is OK: we just won't accept this connection, | |
2242 | * nothing fatal. | |
2243 | */ | |
2244 | perror("accept"); | |
2245 | } else { | |
2246 | ch = net_find_client_host(ns, ns->addr.sin_addr); | |
2247 | if (!ch) | |
2248 | ch = net_add_client_host(ns, &ns->addr); | |
2249 | ||
2250 | ch_add_connection(ns, ch, fd); | |
d39c04ca | 2251 | } |
3fe0b570 | 2252 | } |
d39c04ca | 2253 | |
3fe0b570 AB |
2254 | static struct devpath *nc_add_dpp(struct cl_conn *nc, |
2255 | struct blktrace_net_hdr *bnh, | |
2256 | time_t connect_time) | |
2257 | { | |
2258 | int cpu; | |
2259 | struct io_info *iop; | |
2260 | struct devpath *dpp; | |
2261 | ||
2262 | dpp = malloc(sizeof(*dpp)); | |
2263 | memset(dpp, 0, sizeof(*dpp)); | |
2264 | ||
2265 | dpp->buts_name = strdup(bnh->buts_name); | |
2266 | dpp->path = strdup(bnh->buts_name); | |
2267 | dpp->fd = -1; | |
2268 | dpp->ch = nc->ch; | |
2269 | dpp->cl_id = bnh->cl_id; | |
2270 | dpp->cl_connect_time = connect_time; | |
2271 | dpp->ncpus = nc->ncpus; | |
2272 | dpp->stats = calloc(dpp->ncpus, sizeof(*dpp->stats)); | |
2273 | memset(dpp->stats, 0, dpp->ncpus * sizeof(*dpp->stats)); | |
2274 | ||
2275 | list_add_tail(&dpp->head, &nc->ch->devpaths); | |
2276 | nc->ch->ndevs++; | |
2277 | ||
2278 | dpp->ios = calloc(nc->ncpus, sizeof(*iop)); | |
2279 | memset(dpp->ios, 0, ndevs * sizeof(*iop)); | |
2280 | ||
2281 | for (cpu = 0, iop = dpp->ios; cpu < nc->ncpus; cpu++, iop++) { | |
2282 | iop->dpp = dpp; | |
2283 | iop->nc = nc; | |
2284 | init_mmap_info(&iop->mmap_info); | |
2285 | ||
2286 | if (iop_open(iop, cpu)) | |
2287 | goto err; | |
69dd57c2 AB |
2288 | } |
2289 | ||
3fe0b570 | 2290 | return dpp; |
69dd57c2 | 2291 | |
3fe0b570 AB |
2292 | err: |
2293 | /* | |
2294 | * Need to unravel what's been done... | |
2295 | */ | |
2296 | while (cpu >= 0) | |
2297 | close_iop(&dpp->ios[cpu--]); | |
2298 | dpp_free(dpp); | |
2299 | ||
2300 | return NULL; | |
2301 | } | |
d0ca268b | 2302 | |
3fe0b570 AB |
2303 | static struct devpath *nc_find_dpp(struct cl_conn *nc, |
2304 | struct blktrace_net_hdr *bnh) | |
2305 | { | |
2306 | struct list_head *p; | |
2307 | time_t connect_time = nc->connect_time; | |
3d06efea | 2308 | |
3fe0b570 AB |
2309 | __list_for_each(p, &nc->ch->devpaths) { |
2310 | struct devpath *dpp = list_entry(p, struct devpath, head); | |
2311 | ||
2312 | if (!strcmp(dpp->buts_name, bnh->buts_name)) | |
2313 | return dpp; | |
2314 | ||
2315 | if (dpp->cl_id == bnh->cl_id) | |
2316 | connect_time = dpp->cl_connect_time; | |
d0ca268b JA |
2317 | } |
2318 | ||
3fe0b570 AB |
2319 | return nc_add_dpp(nc, bnh, connect_time); |
2320 | } | |
bc39777c | 2321 | |
3fe0b570 AB |
2322 | static void net_client_read_data(struct cl_conn *nc, struct devpath *dpp, |
2323 | struct blktrace_net_hdr *bnh) | |
2324 | { | |
2325 | int ret; | |
2326 | struct io_info *iop = &dpp->ios[bnh->cpu]; | |
2327 | struct mmap_info *mip = &iop->mmap_info; | |
2328 | ||
2329 | if (setup_mmap(iop->ofd, bnh->len, &iop->mmap_info)) { | |
2330 | fprintf(stderr, "ncd(%s:%d): mmap failed\n", | |
2331 | nc->ch->hostname, nc->fd); | |
2332 | exit(1); | |
2333 | } | |
2334 | ||
2335 | ret = net_recv_data(nc->fd, mip->fs_buf + mip->fs_off, bnh->len); | |
2336 | if (ret > 0) { | |
2337 | pdc_dr_update(dpp, bnh->cpu, ret); | |
2338 | mip->fs_size += ret; | |
2339 | mip->fs_off += ret; | |
2340 | } else if (ret < 0) | |
2341 | exit(1); | |
2342 | } | |
2343 | ||
2344 | /* | |
2345 | * Returns 1 if we closed a host - invalidates other polling information | |
2346 | * that may be present. | |
2347 | */ | |
2348 | static int net_client_data(struct cl_conn *nc) | |
2349 | { | |
2350 | int ret; | |
2351 | struct devpath *dpp; | |
2352 | struct blktrace_net_hdr bnh; | |
2353 | ||
2354 | ret = net_get_header(nc, &bnh); | |
2355 | if (ret == 0) | |
7425d456 | 2356 | return 0; |
3fe0b570 AB |
2357 | |
2358 | if (ret < 0) { | |
2359 | fprintf(stderr, "ncd(%d): header read failed\n", nc->fd); | |
2360 | exit(1); | |
2361 | } | |
2362 | ||
2363 | if (data_is_native == -1 && check_data_endianness(bnh.magic)) { | |
2364 | fprintf(stderr, "ncd(%d): received data is bad\n", nc->fd); | |
2365 | exit(1); | |
2366 | } | |
2367 | ||
2368 | if (!data_is_native) { | |
2369 | bnh.magic = be32_to_cpu(bnh.magic); | |
2370 | bnh.cpu = be32_to_cpu(bnh.cpu); | |
2371 | bnh.max_cpus = be32_to_cpu(bnh.max_cpus); | |
2372 | bnh.len = be32_to_cpu(bnh.len); | |
2373 | bnh.cl_id = be32_to_cpu(bnh.cl_id); | |
2374 | bnh.buf_size = be32_to_cpu(bnh.buf_size); | |
2375 | bnh.buf_nr = be32_to_cpu(bnh.buf_nr); | |
2376 | bnh.page_size = be32_to_cpu(bnh.page_size); | |
2377 | } | |
2378 | ||
2379 | if ((bnh.magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) { | |
2380 | fprintf(stderr, "ncd(%s:%d): bad data magic\n", | |
2381 | nc->ch->hostname, nc->fd); | |
2382 | exit(1); | |
2383 | } | |
2384 | ||
2385 | if (nc->ncpus == -1) | |
2386 | nc->ncpus = bnh.max_cpus; | |
2387 | ||
2388 | /* | |
2389 | * len == 0 means the other end is sending us a new connection/dpp | |
2390 | * len == 1 means that the other end signalled end-of-run | |
2391 | */ | |
2392 | dpp = nc_find_dpp(nc, &bnh); | |
2393 | if (bnh.len == 0) { | |
2394 | /* | |
2395 | * Just adding in the dpp above is enough | |
2396 | */ | |
2397 | ack_open_close(nc->fd, dpp->buts_name); | |
2398 | nc->ch->cl_opens++; | |
2399 | } else if (bnh.len == 1) { | |
2400 | /* | |
2401 | * overload cpu count with dropped events | |
2402 | */ | |
2403 | dpp->drops = bnh.cpu; | |
2404 | ||
2405 | ack_open_close(nc->fd, dpp->buts_name); | |
2406 | if (--nc->ch->cl_opens == 0) { | |
2407 | show_stats(&nc->ch->devpaths); | |
2408 | net_ch_remove(nc->ch, nc->ncpus); | |
2409 | return 1; | |
2410 | } | |
2411 | } else | |
2412 | net_client_read_data(nc, dpp, &bnh); | |
2413 | ||
2414 | return 0; | |
2415 | } | |
2416 | ||
2417 | static void handle_client_data(struct net_server_s *ns, int events) | |
2418 | { | |
2419 | struct cl_conn *nc; | |
2420 | struct pollfd *pfd; | |
2421 | struct list_head *p, *q; | |
2422 | ||
2423 | pfd = &ns->pfds[1]; | |
2424 | list_for_each_safe(p, q, &ns->conn_list) { | |
2425 | if (pfd->revents & POLLIN) { | |
2426 | nc = list_entry(p, struct cl_conn, ns_head); | |
2427 | ||
2428 | if (net_client_data(nc) || --events == 0) | |
2429 | break; | |
2430 | } | |
2431 | pfd++; | |
2432 | } | |
2433 | } | |
2434 | ||
2435 | static void net_setup_pfds(struct net_server_s *ns) | |
2436 | { | |
2437 | struct pollfd *pfd; | |
2438 | struct list_head *p; | |
2439 | ||
2440 | ns->pfds[0].fd = ns->listen_fd; | |
2441 | ns->pfds[0].events = POLLIN; | |
2442 | ||
2443 | pfd = &ns->pfds[1]; | |
2444 | __list_for_each(p, &ns->conn_list) { | |
2445 | struct cl_conn *nc = list_entry(p, struct cl_conn, ns_head); | |
2446 | ||
2447 | pfd->fd = nc->fd; | |
2448 | pfd->events = POLLIN; | |
2449 | pfd++; | |
2450 | } | |
2451 | } | |
2452 | ||
2453 | static int net_server_handle_connections(struct net_server_s *ns) | |
2454 | { | |
2455 | int events; | |
2456 | ||
2457 | printf("server: waiting for connections...\n"); | |
2458 | ||
2459 | while (!done) { | |
2460 | net_setup_pfds(ns); | |
2461 | events = poll(ns->pfds, ns->connects + 1, -1); | |
2462 | if (events < 0) { | |
2463 | if (errno != EINTR) { | |
2464 | perror("FATAL: poll error"); | |
2465 | return 1; | |
2466 | } | |
2467 | } else if (events > 0) { | |
2468 | if (ns->pfds[0].revents & POLLIN) { | |
2469 | net_add_connection(ns); | |
2470 | events--; | |
2471 | } | |
2472 | ||
2473 | if (events) | |
2474 | handle_client_data(ns, events); | |
2475 | } | |
2476 | } | |
2477 | ||
2478 | return 0; | |
2479 | } | |
2480 | ||
2481 | static int net_server(void) | |
2482 | { | |
2483 | int fd, opt; | |
2484 | int ret = 1; | |
2485 | struct net_server_s net_server; | |
2486 | struct net_server_s *ns = &net_server; | |
2487 | ||
2488 | memset(ns, 0, sizeof(*ns)); | |
2489 | INIT_LIST_HEAD(&ns->ch_list); | |
2490 | INIT_LIST_HEAD(&ns->conn_list); | |
2491 | ns->pfds = malloc(sizeof(struct pollfd)); | |
2492 | ||
2493 | fd = my_socket(AF_INET, SOCK_STREAM, 0); | |
2494 | if (fd < 0) { | |
2495 | perror("server: socket"); | |
2496 | goto out; | |
2497 | } | |
2498 | ||
2499 | opt = 1; | |
2500 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0) { | |
2501 | perror("setsockopt"); | |
2502 | goto out; | |
2503 | } | |
2504 | ||
2505 | memset(&ns->addr, 0, sizeof(ns->addr)); | |
2506 | ns->addr.sin_family = AF_INET; | |
2507 | ns->addr.sin_addr.s_addr = htonl(INADDR_ANY); | |
2508 | ns->addr.sin_port = htons(net_port); | |
2509 | ||
2510 | if (bind(fd, (struct sockaddr *) &ns->addr, sizeof(ns->addr)) < 0) { | |
2511 | perror("bind"); | |
2512 | goto out; | |
2513 | } | |
2514 | ||
2515 | if (listen(fd, 1) < 0) { | |
2516 | perror("listen"); | |
2517 | goto out; | |
2518 | } | |
2519 | ||
2520 | /* | |
2521 | * The actual server looping is done here: | |
2522 | */ | |
2523 | ns->listen_fd = fd; | |
2524 | ret = net_server_handle_connections(ns); | |
2525 | ||
2526 | /* | |
2527 | * Clean up and return... | |
2528 | */ | |
2529 | out: | |
2530 | free(ns->pfds); | |
2531 | return ret; | |
2532 | } | |
2533 | ||
2534 | int main(int argc, char *argv[]) | |
2535 | { | |
2536 | int ret = 0; | |
2537 | ||
2538 | setlocale(LC_NUMERIC, "en_US"); | |
2539 | pagesize = getpagesize(); | |
2540 | ncpus = sysconf(_SC_NPROCESSORS_ONLN); | |
2541 | if (ncpus < 0) { | |
2542 | fprintf(stderr, "sysconf(_SC_NPROCESSORS_ONLN) failed %d/%s\n", | |
2543 | errno, strerror(errno)); | |
2544 | ret = 1; | |
2545 | goto out; | |
2546 | } | |
2547 | ||
2548 | if (handle_args(argc, argv)) { | |
2549 | ret = 1; | |
2550 | goto out; | |
bc39777c JA |
2551 | } |
2552 | ||
d0ca268b JA |
2553 | signal(SIGINT, handle_sigint); |
2554 | signal(SIGHUP, handle_sigint); | |
2555 | signal(SIGTERM, handle_sigint); | |
ece238a6 | 2556 | signal(SIGALRM, handle_sigint); |
38e1f0c6 | 2557 | signal(SIGPIPE, SIG_IGN); |
d0ca268b | 2558 | |
3fe0b570 AB |
2559 | if (kill_running_trace) { |
2560 | struct devpath *dpp; | |
2561 | struct list_head *p; | |
8e86c98a | 2562 | |
3fe0b570 AB |
2563 | __list_for_each(p, &devpaths) { |
2564 | dpp = list_entry(p, struct devpath, head); | |
2565 | if (__stop_trace(dpp->fd)) { | |
2566 | fprintf(stderr, | |
2567 | "BLKTRACETEARDOWN %s failed: %d/%s\n", | |
2568 | dpp->path, errno, strerror(errno)); | |
2569 | } | |
2570 | } | |
2571 | } else if (net_mode == Net_server) { | |
2572 | if (output_name) { | |
2573 | fprintf(stderr, "-o ignored in server mode\n"); | |
2574 | output_name = NULL; | |
2575 | } | |
8e86c98a | 2576 | |
3fe0b570 AB |
2577 | ret = net_server(); |
2578 | } else { | |
2579 | atexit(exit_tracing); | |
830fd65c | 2580 | |
3fe0b570 AB |
2581 | if (net_mode == Net_client) |
2582 | printf("blktrace: connecting to %s\n", hostname); | |
ece238a6 | 2583 | |
3fe0b570 | 2584 | setup_buts(); |
d0ca268b | 2585 | |
3fe0b570 AB |
2586 | if (use_tracer_devpaths()) { |
2587 | if (setup_tracer_devpaths()) | |
2588 | goto out; | |
d0ca268b | 2589 | |
3fe0b570 AB |
2590 | if (piped_output) |
2591 | handle_list = handle_list_file; | |
2592 | else | |
2593 | handle_list = handle_list_net; | |
2594 | } | |
eb3c8108 | 2595 | |
df81fdb5 AB |
2596 | start_tracers(); |
2597 | if (nthreads_running == ncpus) { | |
2598 | unblock_tracers(); | |
3b552a2d AB |
2599 | start_buts(); |
2600 | ||
3fe0b570 AB |
2601 | if (net_mode == Net_client) |
2602 | printf("blktrace: connected!\n"); | |
6488ca48 | 2603 | |
3fe0b570 AB |
2604 | if (stop_watch) |
2605 | alarm(stop_watch); | |
df81fdb5 AB |
2606 | } else |
2607 | stop_tracers(); | |
3fe0b570 AB |
2608 | |
2609 | wait_tracers(); | |
df81fdb5 | 2610 | if (nthreads_running == ncpus) |
3fe0b570 AB |
2611 | show_stats(&devpaths); |
2612 | ||
2613 | if (net_client_use_send()) | |
2614 | close_client_connections(); | |
2615 | del_tracers(); | |
2616 | } | |
d0ca268b | 2617 | |
3fe0b570 AB |
2618 | out: |
2619 | if (pfp) | |
2620 | fclose(pfp); | |
2621 | rel_devpaths(); | |
2622 | return ret; | |
2623 | } |