t/dedupe: silence bogus warning on 'bytes' being used uninitialized
[fio.git] / libfio.c
1 /*
2  * fio - the flexible io tester
3  *
4  * Copyright (C) 2005 Jens Axboe <axboe@suse.de>
5  * Copyright (C) 2006-2012 Jens Axboe <axboe@kernel.dk>
6  *
7  * The license below covers all files distributed with fio unless otherwise
8  * noted in the file itself.
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License version 2 as
12  *  published by the Free Software Foundation.
13  *
14  *  This program is distributed in the hope that it will be useful,
15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *  GNU General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License
20  *  along with this program; if not, write to the Free Software
21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22  *
23  */
24
25 #include <string.h>
26 #include <sys/types.h>
27 #include <signal.h>
28 #include <stdint.h>
29 #include <locale.h>
30 #include <fcntl.h>
31
32 #include "fio.h"
33 #include "smalloc.h"
34 #include "os/os.h"
35 #include "filelock.h"
36
37 /*
38  * Just expose an empty list, if the OS does not support disk util stats
39  */
40 #ifndef FIO_HAVE_DISK_UTIL
41 FLIST_HEAD(disk_list);
42 #endif
43
44 unsigned long arch_flags = 0;
45
46 uintptr_t page_mask = 0;
47 uintptr_t page_size = 0;
48
49 static const char *fio_os_strings[os_nr] = {
50         "Invalid",
51         "Linux",
52         "AIX",
53         "FreeBSD",
54         "HP-UX",
55         "OSX",
56         "NetBSD",
57         "OpenBSD",
58         "Solaris",
59         "Windows",
60         "Android",
61         "DragonFly",
62 };
63
64 static const char *fio_arch_strings[arch_nr] = {
65         "Invalid",
66         "x86-64",
67         "x86",
68         "ppc",
69         "ia64",
70         "s390",
71         "alpha",
72         "sparc",
73         "sparc64",
74         "arm",
75         "sh",
76         "hppa",
77         "generic"
78 };
79
80 static void reset_io_counters(struct thread_data *td, int all)
81 {
82         int ddir;
83
84         if (all) {
85                 for (ddir = 0; ddir < DDIR_RWDIR_CNT; ddir++) {
86                         td->stat_io_bytes[ddir] = 0;
87                         td->this_io_bytes[ddir] = 0;
88                         td->stat_io_blocks[ddir] = 0;
89                         td->this_io_blocks[ddir] = 0;
90                         td->rate_bytes[ddir] = 0;
91                         td->rate_blocks[ddir] = 0;
92                         td->bytes_done[ddir] = 0;
93                         td->rate_io_issue_bytes[ddir] = 0;
94                         td->rate_next_io_time[ddir] = 0;
95                 }
96         }
97
98         td->zone_bytes = 0;
99
100         td->last_was_sync = 0;
101         td->rwmix_issues = 0;
102
103         /*
104          * reset file done count if we are to start over
105          */
106         if (td->o.time_based || td->o.loops || td->o.do_verify)
107                 td->nr_done_files = 0;
108 }
109
110 void clear_io_state(struct thread_data *td, int all)
111 {
112         struct fio_file *f;
113         unsigned int i;
114
115         reset_io_counters(td, all);
116
117         close_files(td);
118         for_each_file(td, f, i) {
119                 fio_file_clear_done(f);
120                 f->file_offset = get_start_offset(td, f);
121         }
122
123         /*
124          * Re-Seed random number generator if rand_repeatable is true
125          */
126         if (td->o.rand_repeatable)
127                 td_fill_rand_seeds(td);
128 }
129
130 void reset_all_stats(struct thread_data *td)
131 {
132         struct timeval tv;
133         int i;
134
135         reset_io_counters(td, 1);
136
137         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
138                 td->io_bytes[i] = 0;
139                 td->io_blocks[i] = 0;
140                 td->io_issues[i] = 0;
141                 td->ts.total_io_u[i] = 0;
142                 td->ts.runtime[i] = 0;
143                 td->rwmix_issues = 0;
144         }
145
146         fio_gettime(&tv, NULL);
147         memcpy(&td->epoch, &tv, sizeof(tv));
148         memcpy(&td->start, &tv, sizeof(tv));
149
150         lat_target_reset(td);
151         clear_rusage_stat(td);
152 }
153
154 void reset_fio_state(void)
155 {
156         groupid = 0;
157         thread_number = 0;
158         stat_number = 0;
159         done_secs = 0;
160 }
161
162 const char *fio_get_os_string(int nr)
163 {
164         if (nr < os_nr)
165                 return fio_os_strings[nr];
166
167         return NULL;
168 }
169
170 const char *fio_get_arch_string(int nr)
171 {
172         if (nr < arch_nr)
173                 return fio_arch_strings[nr];
174
175         return NULL;
176 }
177
178 static const char *td_runstates[] = {
179         "NOT_CREATED",
180         "CREATED",
181         "INITIALIZED",
182         "RAMP",
183         "SETTING_UP",
184         "RUNNING",
185         "PRE_READING",
186         "VERIFYING",
187         "FSYNCING",
188         "FINISHING",
189         "EXITED",
190         "REAPED",
191 };
192
193 const char *runstate_to_name(int runstate)
194 {
195         compiletime_assert(TD_LAST == 12, "td runstate list");
196         if (runstate >= 0 && runstate < TD_LAST)
197                 return td_runstates[runstate];
198
199         return "invalid";
200 }
201
202 void td_set_runstate(struct thread_data *td, int runstate)
203 {
204         if (td->runstate == runstate)
205                 return;
206
207         dprint(FD_PROCESS, "pid=%d: runstate %s -> %s\n", (int) td->pid,
208                                                 runstate_to_name(td->runstate),
209                                                 runstate_to_name(runstate));
210         td->runstate = runstate;
211 }
212
213 int td_bump_runstate(struct thread_data *td, int new_state)
214 {
215         int old_state = td->runstate;
216
217         td_set_runstate(td, new_state);
218         return old_state;
219 }
220
221 void td_restore_runstate(struct thread_data *td, int old_state)
222 {
223         td_set_runstate(td, old_state);
224 }
225
226 void fio_mark_td_terminate(struct thread_data *td)
227 {
228         fio_gettime(&td->terminate_time, NULL);
229         write_barrier();
230         td->terminate = 1;
231 }
232
233 void fio_terminate_threads(unsigned int group_id)
234 {
235         struct thread_data *td;
236         pid_t pid = getpid();
237         int i;
238
239         dprint(FD_PROCESS, "terminate group_id=%d\n", group_id);
240
241         for_each_td(td, i) {
242                 if (group_id == TERMINATE_ALL || group_id == td->groupid) {
243                         dprint(FD_PROCESS, "setting terminate on %s/%d\n",
244                                                 td->o.name, (int) td->pid);
245
246                         if (td->terminate)
247                                 continue;
248
249                         fio_mark_td_terminate(td);
250                         td->o.start_delay = 0;
251
252                         /*
253                          * if the thread is running, just let it exit
254                          */
255                         if (!td->pid || pid == td->pid)
256                                 continue;
257                         else if (td->runstate < TD_RAMP)
258                                 kill(td->pid, SIGTERM);
259                         else {
260                                 struct ioengine_ops *ops = td->io_ops;
261
262                                 if (ops && ops->terminate)
263                                         ops->terminate(td);
264                         }
265                 }
266         }
267 }
268
269 int fio_running_or_pending_io_threads(void)
270 {
271         struct thread_data *td;
272         int i;
273
274         for_each_td(td, i) {
275                 if (td->flags & TD_F_NOIO)
276                         continue;
277                 if (td->runstate < TD_EXITED)
278                         return 1;
279         }
280
281         return 0;
282 }
283
284 int fio_set_fd_nonblocking(int fd, const char *who)
285 {
286         int flags;
287
288         flags = fcntl(fd, F_GETFL);
289         if (flags < 0)
290                 log_err("fio: %s failed to get file flags: %s\n", who, strerror(errno));
291         else {
292                 int new_flags = flags | O_NONBLOCK;
293
294                 new_flags = fcntl(fd, F_SETFL, new_flags);
295                 if (new_flags < 0)
296                         log_err("fio: %s failed to get file flags: %s\n", who, strerror(errno));
297         }
298
299         return flags;
300 }
301
302 static int endian_check(void)
303 {
304         union {
305                 uint8_t c[8];
306                 uint64_t v;
307         } u;
308         int le = 0, be = 0;
309
310         u.v = 0x12;
311         if (u.c[7] == 0x12)
312                 be = 1;
313         else if (u.c[0] == 0x12)
314                 le = 1;
315
316 #if defined(CONFIG_LITTLE_ENDIAN)
317         if (be)
318                 return 1;
319 #elif defined(CONFIG_BIG_ENDIAN)
320         if (le)
321                 return 1;
322 #else
323         return 1;
324 #endif
325
326         if (!le && !be)
327                 return 1;
328
329         return 0;
330 }
331
332 int initialize_fio(char *envp[])
333 {
334         long ps;
335
336         /*
337          * We need these to be properly 64-bit aligned, otherwise we
338          * can run into problems on archs that fault on unaligned fp
339          * access (ARM).
340          */
341         compiletime_assert((offsetof(struct thread_stat, percentile_list) % 8) == 0, "stat percentile_list");
342         compiletime_assert((offsetof(struct thread_stat, total_run_time) % 8) == 0, "total_run_time");
343         compiletime_assert((offsetof(struct thread_stat, total_err_count) % 8) == 0, "total_err_count");
344         compiletime_assert((offsetof(struct thread_stat, latency_percentile) % 8) == 0, "stat latency_percentile");
345         compiletime_assert((offsetof(struct thread_options_pack, zipf_theta) % 8) == 0, "zipf_theta");
346         compiletime_assert((offsetof(struct thread_options_pack, pareto_h) % 8) == 0, "pareto_h");
347         compiletime_assert((offsetof(struct thread_options_pack, percentile_list) % 8) == 0, "percentile_list");
348         compiletime_assert((offsetof(struct thread_options_pack, latency_percentile) % 8) == 0, "latency_percentile");
349
350         if (endian_check()) {
351                 log_err("fio: endianness settings appear wrong.\n");
352                 log_err("fio: please report this to fio@vger.kernel.org\n");
353                 return 1;
354         }
355
356 #if !defined(CONFIG_GETTIMEOFDAY) && !defined(CONFIG_CLOCK_GETTIME)
357 #error "No available clock source!"
358 #endif
359
360         arch_init(envp);
361
362         sinit();
363
364         if (fio_filelock_init()) {
365                 log_err("fio: failed initializing filelock subsys\n");
366                 return 1;
367         }
368
369         /*
370          * We need locale for number printing, if it isn't set then just
371          * go with the US format.
372          */
373         if (!getenv("LC_NUMERIC"))
374                 setlocale(LC_NUMERIC, "en_US");
375
376         ps = sysconf(_SC_PAGESIZE);
377         if (ps < 0) {
378                 log_err("Failed to get page size\n");
379                 return 1;
380         }
381
382         page_size = ps;
383         page_mask = ps - 1;
384
385         fio_keywords_init();
386         return 0;
387 }
388
389 void deinitialize_fio(void)
390 {
391         fio_keywords_exit();
392 }