1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005-2008 Poul-Henning Kamp 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <assert.h> 32 #include <stdio.h> 33 #include <string.h> 34 #include <stdlib.h> 35 #include <unistd.h> 36 #include <stdint.h> 37 #include <time.h> 38 #include <sys/endian.h> 39 40 #include <zlib.h> 41 42 #include "fifolog.h" 43 #include "libfifolog_int.h" 44 #include "fifolog_write.h" 45 #include "miniobj.h" 46 47 static int fifolog_write_gzip(struct fifolog_writer *f, time_t now); 48 49 #define ALLOC(ptr, size) do { \ 50 (*(ptr)) = calloc(1, size); \ 51 assert(*(ptr) != NULL); \ 52 } while (0) 53 54 55 const char *fifolog_write_statnames[] = { 56 [FIFOLOG_PT_BYTES_PRE] = "Bytes before compression", 57 [FIFOLOG_PT_BYTES_POST] = "Bytes after compression", 58 [FIFOLOG_PT_WRITES] = "Writes", 59 [FIFOLOG_PT_FLUSH] = "Flushes", 60 [FIFOLOG_PT_SYNC] = "Syncs", 61 [FIFOLOG_PT_RUNTIME] = "Runtime" 62 }; 63 64 /********************************************************************** 65 * Check that everything is all right 66 */ 67 static void 68 fifolog_write_assert(const struct fifolog_writer *f) 69 { 70 71 CHECK_OBJ_NOTNULL(f, FIFOLOG_WRITER_MAGIC); 72 assert(f->ff->zs->next_out + f->ff->zs->avail_out == \ 73 f->obuf + f->obufsize); 74 } 75 76 /********************************************************************** 77 * Allocate/Destroy a new fifolog writer instance 78 */ 79 80 struct fifolog_writer * 81 fifolog_write_new(void) 82 { 83 struct fifolog_writer *f; 84 85 ALLOC_OBJ(f, FIFOLOG_WRITER_MAGIC); 86 assert(f != NULL); 87 return (f); 88 } 89 90 void 91 fifolog_write_destroy(struct fifolog_writer *f) 92 { 93 94 free(f->obuf); 95 free(f->ibuf); 96 FREE_OBJ(f); 97 } 98 99 /********************************************************************** 100 * Open/Close the fifolog 101 */ 102 103 void 104 fifolog_write_close(struct fifolog_writer *f) 105 { 106 time_t now; 107 108 CHECK_OBJ_NOTNULL(f, FIFOLOG_WRITER_MAGIC); 109 fifolog_write_assert(f); 110 111 f->cleanup = 1; 112 time(&now); 113 fifolog_write_gzip(f, now); 114 fifolog_write_assert(f); 115 fifolog_int_close(&f->ff); 116 free(f->ff); 117 } 118 119 const char * 120 fifolog_write_open(struct fifolog_writer *f, const char *fn, 121 unsigned writerate, unsigned syncrate, unsigned compression) 122 { 123 const char *es; 124 int i; 125 time_t now; 126 off_t o; 127 128 CHECK_OBJ_NOTNULL(f, FIFOLOG_WRITER_MAGIC); 129 130 /* Check for legal compression value */ 131 if (compression > Z_BEST_COMPRESSION) 132 return ("Illegal compression value"); 133 134 f->writerate = writerate; 135 f->syncrate = syncrate; 136 f->compression = compression; 137 138 /* Reset statistics */ 139 memset(f->cnt, 0, sizeof f->cnt); 140 141 es = fifolog_int_open(&f->ff, fn, 1); 142 if (es != NULL) 143 return (es); 144 es = fifolog_int_findend(f->ff, &o); 145 if (es != NULL) 146 return (es); 147 i = fifolog_int_read(f->ff, o); 148 if (i) 149 return ("Read error, looking for seq"); 150 f->seq = be32dec(f->ff->recbuf); 151 if (f->seq == 0) { 152 /* Empty fifolog */ 153 f->seq = random(); 154 } else { 155 f->recno = o + 1; 156 f->seq++; 157 } 158 159 f->obufsize = f->ff->recsize; 160 ALLOC(&f->obuf, f->obufsize); 161 162 f->ibufsize = f->obufsize * 10; 163 ALLOC(&f->ibuf, f->ibufsize); 164 f->ibufptr = 0; 165 166 i = deflateInit(f->ff->zs, (int)f->compression); 167 assert(i == Z_OK); 168 169 f->flag |= FIFOLOG_FLG_RESTART; 170 f->flag |= FIFOLOG_FLG_SYNC; 171 f->ff->zs->next_out = f->obuf + 9; 172 f->ff->zs->avail_out = f->obufsize - 9; 173 174 time(&now); 175 f->starttime = now; 176 f->lastsync = now; 177 f->lastwrite = now; 178 179 fifolog_write_assert(f); 180 return (NULL); 181 } 182 183 /********************************************************************** 184 * Write an output record 185 * Returns -1 if there are trouble writing data 186 */ 187 188 static int 189 fifolog_write_output(struct fifolog_writer *f, int fl, time_t now) 190 { 191 long h, l = f->ff->zs->next_out - f->obuf; 192 ssize_t i, w; 193 int retval = 0; 194 195 h = 4; /* seq */ 196 be32enc(f->obuf, f->seq); 197 f->obuf[h] = f->flag; 198 h += 1; /* flag */ 199 if (f->flag & FIFOLOG_FLG_SYNC) { 200 be32enc(f->obuf + h, now); 201 h += 4; /* timestamp */ 202 } 203 204 assert(l <= (long)f->ff->recsize); /* NB: l includes h */ 205 assert(l >= h); 206 207 /* We will never write an entirely empty buffer */ 208 if (l == h) 209 return (0); 210 211 if (l < (long)f->ff->recsize && fl == Z_NO_FLUSH) 212 return (0); 213 214 w = f->ff->recsize - l; 215 if (w > 255) { 216 be32enc(f->obuf + f->ff->recsize - 4, w); 217 f->obuf[4] |= FIFOLOG_FLG_4BYTE; 218 } else if (w > 0) { 219 f->obuf[f->ff->recsize - 1] = (uint8_t)w; 220 f->obuf[4] |= FIFOLOG_FLG_1BYTE; 221 } 222 223 f->cnt[FIFOLOG_PT_BYTES_POST] += l - h; 224 225 i = pwrite(f->ff->fd, f->obuf, f->ff->recsize, 226 (f->recno + 1) * f->ff->recsize); 227 if (i != f->ff->recsize) 228 retval = -1; 229 else 230 retval = 1; 231 232 f->cnt[FIFOLOG_PT_WRITES]++; 233 f->cnt[FIFOLOG_PT_RUNTIME] = now - f->starttime; 234 235 f->lastwrite = now; 236 /* 237 * We increment these even on error, so as to properly skip bad, 238 * sectors or other light trouble. 239 */ 240 f->seq++; 241 f->recno++; 242 f->flag = 0; 243 244 memset(f->obuf, 0, f->obufsize); 245 f->ff->zs->next_out = f->obuf + 5; 246 f->ff->zs->avail_out = f->obufsize - 5; 247 return (retval); 248 } 249 250 /********************************************************************** 251 * Run the compression engine 252 * Returns -1 if there are trouble writing data 253 */ 254 255 static int 256 fifolog_write_gzip(struct fifolog_writer *f, time_t now) 257 { 258 int i, fl, retval = 0; 259 260 assert(now != 0); 261 if (f->cleanup || now >= (int)(f->lastsync + f->syncrate)) { 262 f->cleanup = 0; 263 fl = Z_FINISH; 264 f->cnt[FIFOLOG_PT_SYNC]++; 265 } else if (now >= (int)(f->lastwrite + f->writerate)) { 266 fl = Z_SYNC_FLUSH; 267 f->cnt[FIFOLOG_PT_FLUSH]++; 268 } else if (f->ibufptr == 0) 269 return (0); 270 else 271 fl = Z_NO_FLUSH; 272 273 f->ff->zs->avail_in = f->ibufptr; 274 f->ff->zs->next_in = f->ibuf; 275 276 while (1) { 277 i = deflate(f->ff->zs, fl); 278 assert(i == Z_OK || i == Z_BUF_ERROR || i == Z_STREAM_END); 279 280 i = fifolog_write_output(f, fl, now); 281 if (i == 0) 282 break; 283 if (i < 0) 284 retval = -1; 285 } 286 assert(f->ff->zs->avail_in == 0); 287 f->ibufptr = 0; 288 if (fl == Z_FINISH) { 289 f->flag |= FIFOLOG_FLG_SYNC; 290 f->ff->zs->next_out = f->obuf + 9; 291 f->ff->zs->avail_out = f->obufsize - 9; 292 f->lastsync = now; 293 assert(Z_OK == deflateReset(f->ff->zs)); 294 } 295 return (retval); 296 } 297 298 /********************************************************************** 299 * Poll to see if we need to flush out a record 300 * Returns -1 if there are trouble writing data 301 */ 302 303 int 304 fifolog_write_poll(struct fifolog_writer *f, time_t now) 305 { 306 307 if (now == 0) 308 time(&now); 309 return (fifolog_write_gzip(f, now)); 310 } 311 312 /********************************************************************** 313 * Attempt to write an entry into the ibuf. 314 * Return zero if there is no space, one otherwise 315 */ 316 317 int 318 fifolog_write_record(struct fifolog_writer *f, uint32_t id, time_t now, 319 const void *ptr, ssize_t len) 320 { 321 const unsigned char *p; 322 uint8_t buf[9]; 323 ssize_t bufl; 324 325 fifolog_write_assert(f); 326 assert(!(id & (FIFOLOG_TIMESTAMP|FIFOLOG_LENGTH))); 327 assert(ptr != NULL); 328 329 p = ptr; 330 if (len == 0) { 331 len = strlen(ptr); 332 len++; 333 } else { 334 assert(len <= 255); 335 id |= FIFOLOG_LENGTH; 336 } 337 assert (len > 0); 338 339 /* Do a timestamp, if needed */ 340 if (now == 0) 341 time(&now); 342 343 if (now != f->last) 344 id |= FIFOLOG_TIMESTAMP; 345 346 /* Emit instance+flag */ 347 be32enc(buf, id); 348 bufl = 4; 349 350 if (id & FIFOLOG_TIMESTAMP) { 351 be32enc(buf + bufl, (uint32_t)now); 352 bufl += 4; 353 } 354 if (id & FIFOLOG_LENGTH) 355 buf[bufl++] = (u_char)len; 356 357 if (bufl + len + f->ibufptr > f->ibufsize) 358 return (0); 359 360 memcpy(f->ibuf + f->ibufptr, buf, bufl); 361 f->ibufptr += bufl; 362 memcpy(f->ibuf + f->ibufptr, p, len); 363 f->ibufptr += len; 364 f->cnt[FIFOLOG_PT_BYTES_PRE] += bufl + len; 365 366 if (id & FIFOLOG_TIMESTAMP) 367 f->last = now; 368 return (1); 369 } 370 371 /********************************************************************** 372 * Write an entry, polling the gzip/writer until success. 373 * Long binary entries are broken into 255 byte chunks. 374 * Returns -1 if there are problems writing data 375 */ 376 377 int 378 fifolog_write_record_poll(struct fifolog_writer *f, uint32_t id, time_t now, 379 const void *ptr, ssize_t len) 380 { 381 u_int l; 382 const unsigned char *p; 383 int retval = 0; 384 385 if (now == 0) 386 time(&now); 387 fifolog_write_assert(f); 388 389 assert(!(id & (FIFOLOG_TIMESTAMP|FIFOLOG_LENGTH))); 390 assert(ptr != NULL); 391 392 if (len == 0) { 393 if (!fifolog_write_record(f, id, now, ptr, len)) { 394 if (fifolog_write_gzip(f, now) < 0) 395 retval = -1; 396 /* The string could be too long for the ibuf, so... */ 397 if (!fifolog_write_record(f, id, now, ptr, len)) 398 retval = -1; 399 } 400 } else { 401 for (p = ptr; len > 0; len -= l, p += l) { 402 l = len; 403 if (l > 255) 404 l = 255; 405 while (!fifolog_write_record(f, id, now, p, l)) 406 if (fifolog_write_gzip(f, now) < 0) 407 retval = -1; 408 } 409 } 410 if (fifolog_write_gzip(f, now) < 0) 411 retval = -1; 412 fifolog_write_assert(f); 413 return (retval); 414 } 415