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10ba535a JA |
1 | #include <unistd.h> |
2 | #include <fcntl.h> | |
3 | #include <string.h> | |
4 | #include <signal.h> | |
5 | #include <time.h> | |
6 | #include <assert.h> | |
7 | ||
8 | #include "fio.h" | |
9 | #include "os.h" | |
10 | ||
11 | /* | |
12 | * The ->file_map[] contains a map of blocks we have or have not done io | |
13 | * to yet. Used to make sure we cover the entire range in a fair fashion. | |
14 | */ | |
15 | static int random_map_free(struct thread_data *td, struct fio_file *f, | |
16 | unsigned long long block) | |
17 | { | |
18 | unsigned int idx = RAND_MAP_IDX(td, f, block); | |
19 | unsigned int bit = RAND_MAP_BIT(td, f, block); | |
20 | ||
21 | return (f->file_map[idx] & (1UL << bit)) == 0; | |
22 | } | |
23 | ||
df415585 JA |
24 | /* |
25 | * Mark a given offset as used in the map. | |
26 | */ | |
27 | static void mark_random_map(struct thread_data *td, struct fio_file *f, | |
28 | struct io_u *io_u) | |
29 | { | |
30 | unsigned long long block = io_u->offset / (unsigned long long) td->min_bs; | |
31 | unsigned int blocks = 0; | |
32 | ||
33 | while (blocks < (io_u->buflen / td->min_bs)) { | |
34 | unsigned int idx, bit; | |
35 | ||
36 | if (!random_map_free(td, f, block)) | |
37 | break; | |
38 | ||
39 | idx = RAND_MAP_IDX(td, f, block); | |
40 | bit = RAND_MAP_BIT(td, f, block); | |
41 | ||
42 | assert(idx < f->num_maps); | |
43 | ||
44 | f->file_map[idx] |= (1UL << bit); | |
45 | block++; | |
46 | blocks++; | |
47 | } | |
48 | ||
49 | if ((blocks * td->min_bs) < io_u->buflen) | |
50 | io_u->buflen = blocks * td->min_bs; | |
51 | } | |
52 | ||
10ba535a JA |
53 | /* |
54 | * Return the next free block in the map. | |
55 | */ | |
56 | static int get_next_free_block(struct thread_data *td, struct fio_file *f, | |
57 | unsigned long long *b) | |
58 | { | |
59 | int i; | |
60 | ||
61 | *b = 0; | |
62 | i = 0; | |
63 | while ((*b) * td->min_bs < f->file_size) { | |
64 | if (f->file_map[i] != -1UL) { | |
65 | *b += ffz(f->file_map[i]); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | *b += BLOCKS_PER_MAP; | |
70 | i++; | |
71 | } | |
72 | ||
73 | return 1; | |
74 | } | |
75 | ||
76 | /* | |
77 | * For random io, generate a random new block and see if it's used. Repeat | |
78 | * until we find a free one. For sequential io, just return the end of | |
79 | * the last io issued. | |
80 | */ | |
81 | static int get_next_offset(struct thread_data *td, struct fio_file *f, | |
82 | unsigned long long *offset) | |
83 | { | |
84 | unsigned long long b, rb; | |
85 | long r; | |
86 | ||
87 | if (!td->sequential) { | |
88 | unsigned long long max_blocks = td->io_size / td->min_bs; | |
89 | int loops = 50; | |
90 | ||
91 | do { | |
92 | r = os_random_long(&td->random_state); | |
93 | b = ((max_blocks - 1) * r / (unsigned long long) (RAND_MAX+1.0)); | |
bb8895e0 JA |
94 | if (td->norandommap) |
95 | break; | |
10ba535a JA |
96 | rb = b + (f->file_offset / td->min_bs); |
97 | loops--; | |
98 | } while (!random_map_free(td, f, rb) && loops); | |
99 | ||
100 | if (!loops) { | |
101 | if (get_next_free_block(td, f, &b)) | |
102 | return 1; | |
103 | } | |
104 | } else | |
105 | b = f->last_pos / td->min_bs; | |
106 | ||
107 | *offset = (b * td->min_bs) + f->file_offset; | |
108 | if (*offset > f->file_size) | |
109 | return 1; | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | static unsigned int get_next_buflen(struct thread_data *td) | |
115 | { | |
116 | unsigned int buflen; | |
117 | long r; | |
118 | ||
119 | if (td->min_bs == td->max_bs) | |
120 | buflen = td->min_bs; | |
121 | else { | |
122 | r = os_random_long(&td->bsrange_state); | |
123 | buflen = (1 + (double) (td->max_bs - 1) * r / (RAND_MAX + 1.0)); | |
124 | buflen = (buflen + td->min_bs - 1) & ~(td->min_bs - 1); | |
125 | } | |
126 | ||
127 | if (buflen > td->io_size - td->this_io_bytes[td->ddir]) { | |
128 | /* | |
129 | * if using direct/raw io, we may not be able to | |
130 | * shrink the size. so just fail it. | |
131 | */ | |
132 | if (td->io_ops->flags & FIO_RAWIO) | |
133 | return 0; | |
134 | ||
135 | buflen = td->io_size - td->this_io_bytes[td->ddir]; | |
136 | } | |
137 | ||
138 | return buflen; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Return the data direction for the next io_u. If the job is a | |
143 | * mixed read/write workload, check the rwmix cycle and switch if | |
144 | * necessary. | |
145 | */ | |
146 | static int get_rw_ddir(struct thread_data *td) | |
147 | { | |
148 | if (td_rw(td)) { | |
149 | struct timeval now; | |
150 | unsigned long elapsed; | |
151 | ||
152 | gettimeofday(&now, NULL); | |
153 | elapsed = mtime_since_now(&td->rwmix_switch); | |
154 | ||
155 | /* | |
156 | * Check if it's time to seed a new data direction. | |
157 | */ | |
158 | if (elapsed >= td->rwmixcycle) { | |
159 | unsigned int v; | |
160 | long r; | |
161 | ||
162 | r = os_random_long(&td->rwmix_state); | |
163 | v = 1 + (int) (100.0 * (r / (RAND_MAX + 1.0))); | |
164 | if (v < td->rwmixread) | |
165 | td->rwmix_ddir = DDIR_READ; | |
166 | else | |
167 | td->rwmix_ddir = DDIR_WRITE; | |
168 | memcpy(&td->rwmix_switch, &now, sizeof(now)); | |
169 | } | |
170 | return td->rwmix_ddir; | |
171 | } else if (td_read(td)) | |
172 | return DDIR_READ; | |
173 | else | |
174 | return DDIR_WRITE; | |
175 | } | |
176 | ||
10ba535a JA |
177 | void put_io_u(struct thread_data *td, struct io_u *io_u) |
178 | { | |
179 | io_u->file = NULL; | |
180 | list_del(&io_u->list); | |
181 | list_add(&io_u->list, &td->io_u_freelist); | |
182 | td->cur_depth--; | |
183 | } | |
184 | ||
185 | static int fill_io_u(struct thread_data *td, struct fio_file *f, | |
186 | struct io_u *io_u) | |
187 | { | |
188 | /* | |
189 | * If using an iolog, grab next piece if any available. | |
190 | */ | |
191 | if (td->read_iolog) | |
192 | return read_iolog_get(td, io_u); | |
193 | ||
87dc1ab1 JA |
194 | /* |
195 | * see if it's time to sync | |
196 | */ | |
197 | if (td->fsync_blocks && !(td->io_blocks[DDIR_WRITE] % td->fsync_blocks) | |
198 | && should_fsync(td)) { | |
199 | io_u->ddir = DDIR_SYNC; | |
200 | io_u->file = f; | |
201 | return 0; | |
202 | } | |
203 | ||
10ba535a JA |
204 | /* |
205 | * No log, let the seq/rand engine retrieve the next position. | |
206 | */ | |
207 | if (!get_next_offset(td, f, &io_u->offset)) { | |
208 | io_u->buflen = get_next_buflen(td); | |
209 | ||
210 | if (io_u->buflen) { | |
211 | io_u->ddir = get_rw_ddir(td); | |
212 | ||
213 | /* | |
214 | * If using a write iolog, store this entry. | |
215 | */ | |
076efc7c | 216 | if (td->write_iolog_file) |
10ba535a JA |
217 | write_iolog_put(td, io_u); |
218 | ||
219 | io_u->file = f; | |
220 | return 0; | |
221 | } | |
222 | } | |
223 | ||
224 | return 1; | |
225 | } | |
226 | ||
227 | struct io_u *__get_io_u(struct thread_data *td) | |
228 | { | |
229 | struct io_u *io_u = NULL; | |
230 | ||
231 | if (!queue_full(td)) { | |
232 | io_u = list_entry(td->io_u_freelist.next, struct io_u, list); | |
233 | ||
6040dabc | 234 | io_u->buflen = 0; |
10ba535a JA |
235 | io_u->error = 0; |
236 | io_u->resid = 0; | |
237 | list_del(&io_u->list); | |
238 | list_add(&io_u->list, &td->io_u_busylist); | |
239 | td->cur_depth++; | |
240 | } | |
241 | ||
242 | return io_u; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Return an io_u to be processed. Gets a buflen and offset, sets direction, | |
247 | * etc. The returned io_u is fully ready to be prepped and submitted. | |
248 | */ | |
249 | struct io_u *get_io_u(struct thread_data *td, struct fio_file *f) | |
250 | { | |
251 | struct io_u *io_u; | |
252 | ||
253 | io_u = __get_io_u(td); | |
254 | if (!io_u) | |
255 | return NULL; | |
256 | ||
257 | if (td->zone_bytes >= td->zone_size) { | |
258 | td->zone_bytes = 0; | |
259 | f->last_pos += td->zone_skip; | |
260 | } | |
261 | ||
262 | if (fill_io_u(td, f, io_u)) { | |
263 | put_io_u(td, io_u); | |
264 | return NULL; | |
265 | } | |
266 | ||
267 | if (io_u->buflen + io_u->offset > f->file_size) { | |
268 | if (td->io_ops->flags & FIO_RAWIO) { | |
269 | put_io_u(td, io_u); | |
270 | return NULL; | |
271 | } | |
272 | ||
273 | io_u->buflen = f->file_size - io_u->offset; | |
274 | } | |
275 | ||
87dc1ab1 JA |
276 | if (io_u->ddir != DDIR_SYNC) { |
277 | if (!io_u->buflen) { | |
278 | put_io_u(td, io_u); | |
279 | return NULL; | |
280 | } | |
10ba535a | 281 | |
bb8895e0 | 282 | if (!td->read_iolog && !td->sequential && !td->norandommap) |
87dc1ab1 | 283 | mark_random_map(td, f, io_u); |
10ba535a | 284 | |
87dc1ab1 | 285 | f->last_pos += io_u->buflen; |
10ba535a | 286 | |
87dc1ab1 JA |
287 | if (td->verify != VERIFY_NONE) |
288 | populate_verify_io_u(td, io_u); | |
289 | } | |
10ba535a JA |
290 | |
291 | if (td_io_prep(td, io_u)) { | |
292 | put_io_u(td, io_u); | |
293 | return NULL; | |
294 | } | |
295 | ||
296 | gettimeofday(&io_u->start_time, NULL); | |
297 | return io_u; | |
298 | } | |
299 | ||
300 | void io_completed(struct thread_data *td, struct io_u *io_u, | |
301 | struct io_completion_data *icd) | |
302 | { | |
303 | struct timeval e; | |
304 | unsigned long msec; | |
305 | ||
87dc1ab1 JA |
306 | if (io_u->ddir == DDIR_SYNC) { |
307 | td->last_was_sync = 1; | |
308 | return; | |
309 | } | |
310 | ||
311 | td->last_was_sync = 0; | |
312 | ||
10ba535a JA |
313 | gettimeofday(&e, NULL); |
314 | ||
315 | if (!io_u->error) { | |
316 | unsigned int bytes = io_u->buflen - io_u->resid; | |
317 | const int idx = io_u->ddir; | |
318 | ||
319 | td->io_blocks[idx]++; | |
320 | td->io_bytes[idx] += bytes; | |
321 | td->zone_bytes += bytes; | |
322 | td->this_io_bytes[idx] += bytes; | |
323 | ||
324 | msec = mtime_since(&io_u->issue_time, &e); | |
325 | ||
326 | add_clat_sample(td, idx, msec); | |
327 | add_bw_sample(td, idx); | |
328 | ||
329 | if ((td_rw(td) || td_write(td)) && idx == DDIR_WRITE) | |
330 | log_io_piece(td, io_u); | |
331 | ||
332 | icd->bytes_done[idx] += bytes; | |
333 | } else | |
334 | icd->error = io_u->error; | |
335 | } | |
336 | ||
337 | void ios_completed(struct thread_data *td, struct io_completion_data *icd) | |
338 | { | |
339 | struct io_u *io_u; | |
340 | int i; | |
341 | ||
342 | icd->error = 0; | |
343 | icd->bytes_done[0] = icd->bytes_done[1] = 0; | |
344 | ||
345 | for (i = 0; i < icd->nr; i++) { | |
346 | io_u = td->io_ops->event(td, i); | |
347 | ||
348 | io_completed(td, io_u, icd); | |
349 | put_io_u(td, io_u); | |
350 | } | |
351 | } | |
352 | ||
353 |