Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/geom/journal/g_journal.c
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1 /*- 2 * Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/11.0/sys/geom/journal/g_journal.c 300288 2016-05-20 08:25:37Z kib $"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/limits.h> 35 #include <sys/lock.h> 36 #include <sys/mutex.h> 37 #include <sys/bio.h> 38 #include <sys/sysctl.h> 39 #include <sys/malloc.h> 40 #include <sys/mount.h> 41 #include <sys/eventhandler.h> 42 #include <sys/proc.h> 43 #include <sys/kthread.h> 44 #include <sys/sched.h> 45 #include <sys/taskqueue.h> 46 #include <sys/vnode.h> 47 #include <sys/sbuf.h> 48 #ifdef GJ_MEMDEBUG 49 #include <sys/stack.h> 50 #include <sys/kdb.h> 51 #endif 52 #include <vm/vm.h> 53 #include <vm/vm_kern.h> 54 #include <geom/geom.h> 55 56 #include <geom/journal/g_journal.h> 57 58 FEATURE(geom_journal, "GEOM journaling support"); 59 60 /* 61 * On-disk journal format: 62 * 63 * JH - Journal header 64 * RH - Record header 65 * 66 * %%%%%% ****** +------+ +------+ ****** +------+ %%%%%% 67 * % JH % * RH * | Data | | Data | ... * RH * | Data | ... % JH % ... 68 * %%%%%% ****** +------+ +------+ ****** +------+ %%%%%% 69 * 70 */ 71 72 CTASSERT(sizeof(struct g_journal_header) <= 512); 73 CTASSERT(sizeof(struct g_journal_record_header) <= 512); 74 75 static MALLOC_DEFINE(M_JOURNAL, "journal_data", "GEOM_JOURNAL Data"); 76 static struct mtx g_journal_cache_mtx; 77 MTX_SYSINIT(g_journal_cache, &g_journal_cache_mtx, "cache usage", MTX_DEF); 78 79 const struct g_journal_desc *g_journal_filesystems[] = { 80 &g_journal_ufs, 81 NULL 82 }; 83 84 SYSCTL_DECL(_kern_geom); 85 86 int g_journal_debug = 0; 87 static u_int g_journal_switch_time = 10; 88 static u_int g_journal_force_switch = 70; 89 static u_int g_journal_parallel_flushes = 16; 90 static u_int g_journal_parallel_copies = 16; 91 static u_int g_journal_accept_immediately = 64; 92 static u_int g_journal_record_entries = GJ_RECORD_HEADER_NENTRIES; 93 static u_int g_journal_do_optimize = 1; 94 95 static SYSCTL_NODE(_kern_geom, OID_AUTO, journal, CTLFLAG_RW, 0, 96 "GEOM_JOURNAL stuff"); 97 SYSCTL_INT(_kern_geom_journal, OID_AUTO, debug, CTLFLAG_RWTUN, &g_journal_debug, 0, 98 "Debug level"); 99 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, switch_time, CTLFLAG_RW, 100 &g_journal_switch_time, 0, "Switch journals every N seconds"); 101 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, force_switch, CTLFLAG_RW, 102 &g_journal_force_switch, 0, "Force switch when journal is N% full"); 103 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, parallel_flushes, CTLFLAG_RW, 104 &g_journal_parallel_flushes, 0, 105 "Number of flush I/O requests to send in parallel"); 106 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, accept_immediately, CTLFLAG_RW, 107 &g_journal_accept_immediately, 0, 108 "Number of I/O requests accepted immediately"); 109 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, parallel_copies, CTLFLAG_RW, 110 &g_journal_parallel_copies, 0, 111 "Number of copy I/O requests to send in parallel"); 112 static int 113 g_journal_record_entries_sysctl(SYSCTL_HANDLER_ARGS) 114 { 115 u_int entries; 116 int error; 117 118 entries = g_journal_record_entries; 119 error = sysctl_handle_int(oidp, &entries, 0, req); 120 if (error != 0 || req->newptr == NULL) 121 return (error); 122 if (entries < 1 || entries > GJ_RECORD_HEADER_NENTRIES) 123 return (EINVAL); 124 g_journal_record_entries = entries; 125 return (0); 126 } 127 SYSCTL_PROC(_kern_geom_journal, OID_AUTO, record_entries, 128 CTLTYPE_UINT | CTLFLAG_RW, NULL, 0, g_journal_record_entries_sysctl, "I", 129 "Maximum number of entires in one journal record"); 130 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, optimize, CTLFLAG_RW, 131 &g_journal_do_optimize, 0, "Try to combine bios on flush and copy"); 132 133 static u_int g_journal_cache_used = 0; 134 static u_int g_journal_cache_limit = 64 * 1024 * 1024; 135 static u_int g_journal_cache_divisor = 2; 136 static u_int g_journal_cache_switch = 90; 137 static u_int g_journal_cache_misses = 0; 138 static u_int g_journal_cache_alloc_failures = 0; 139 static u_int g_journal_cache_low = 0; 140 141 static SYSCTL_NODE(_kern_geom_journal, OID_AUTO, cache, CTLFLAG_RW, 0, 142 "GEOM_JOURNAL cache"); 143 SYSCTL_UINT(_kern_geom_journal_cache, OID_AUTO, used, CTLFLAG_RD, 144 &g_journal_cache_used, 0, "Number of allocated bytes"); 145 static int 146 g_journal_cache_limit_sysctl(SYSCTL_HANDLER_ARGS) 147 { 148 u_int limit; 149 int error; 150 151 limit = g_journal_cache_limit; 152 error = sysctl_handle_int(oidp, &limit, 0, req); 153 if (error != 0 || req->newptr == NULL) 154 return (error); 155 g_journal_cache_limit = limit; 156 g_journal_cache_low = (limit / 100) * g_journal_cache_switch; 157 return (0); 158 } 159 SYSCTL_PROC(_kern_geom_journal_cache, OID_AUTO, limit, 160 CTLTYPE_UINT | CTLFLAG_RWTUN, NULL, 0, g_journal_cache_limit_sysctl, "I", 161 "Maximum number of allocated bytes"); 162 SYSCTL_UINT(_kern_geom_journal_cache, OID_AUTO, divisor, CTLFLAG_RDTUN, 163 &g_journal_cache_divisor, 0, 164 "(kmem_size / kern.geom.journal.cache.divisor) == cache size"); 165 static int 166 g_journal_cache_switch_sysctl(SYSCTL_HANDLER_ARGS) 167 { 168 u_int cswitch; 169 int error; 170 171 cswitch = g_journal_cache_switch; 172 error = sysctl_handle_int(oidp, &cswitch, 0, req); 173 if (error != 0 || req->newptr == NULL) 174 return (error); 175 if (cswitch > 100) 176 return (EINVAL); 177 g_journal_cache_switch = cswitch; 178 g_journal_cache_low = (g_journal_cache_limit / 100) * cswitch; 179 return (0); 180 } 181 SYSCTL_PROC(_kern_geom_journal_cache, OID_AUTO, switch, 182 CTLTYPE_UINT | CTLFLAG_RW, NULL, 0, g_journal_cache_switch_sysctl, "I", 183 "Force switch when we hit this percent of cache use"); 184 SYSCTL_UINT(_kern_geom_journal_cache, OID_AUTO, misses, CTLFLAG_RW, 185 &g_journal_cache_misses, 0, "Number of cache misses"); 186 SYSCTL_UINT(_kern_geom_journal_cache, OID_AUTO, alloc_failures, CTLFLAG_RW, 187 &g_journal_cache_alloc_failures, 0, "Memory allocation failures"); 188 189 static u_long g_journal_stats_bytes_skipped = 0; 190 static u_long g_journal_stats_combined_ios = 0; 191 static u_long g_journal_stats_switches = 0; 192 static u_long g_journal_stats_wait_for_copy = 0; 193 static u_long g_journal_stats_journal_full = 0; 194 static u_long g_journal_stats_low_mem = 0; 195 196 static SYSCTL_NODE(_kern_geom_journal, OID_AUTO, stats, CTLFLAG_RW, 0, 197 "GEOM_JOURNAL statistics"); 198 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, skipped_bytes, CTLFLAG_RW, 199 &g_journal_stats_bytes_skipped, 0, "Number of skipped bytes"); 200 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, combined_ios, CTLFLAG_RW, 201 &g_journal_stats_combined_ios, 0, "Number of combined I/O requests"); 202 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, switches, CTLFLAG_RW, 203 &g_journal_stats_switches, 0, "Number of journal switches"); 204 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, wait_for_copy, CTLFLAG_RW, 205 &g_journal_stats_wait_for_copy, 0, "Wait for journal copy on switch"); 206 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, journal_full, CTLFLAG_RW, 207 &g_journal_stats_journal_full, 0, 208 "Number of times journal was almost full."); 209 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, low_mem, CTLFLAG_RW, 210 &g_journal_stats_low_mem, 0, "Number of times low_mem hook was called."); 211 212 static g_taste_t g_journal_taste; 213 static g_ctl_req_t g_journal_config; 214 static g_dumpconf_t g_journal_dumpconf; 215 static g_init_t g_journal_init; 216 static g_fini_t g_journal_fini; 217 218 struct g_class g_journal_class = { 219 .name = G_JOURNAL_CLASS_NAME, 220 .version = G_VERSION, 221 .taste = g_journal_taste, 222 .ctlreq = g_journal_config, 223 .dumpconf = g_journal_dumpconf, 224 .init = g_journal_init, 225 .fini = g_journal_fini 226 }; 227 228 static int g_journal_destroy(struct g_journal_softc *sc); 229 static void g_journal_metadata_update(struct g_journal_softc *sc); 230 static void g_journal_switch_wait(struct g_journal_softc *sc); 231 232 #define GJ_SWITCHER_WORKING 0 233 #define GJ_SWITCHER_DIE 1 234 #define GJ_SWITCHER_DIED 2 235 static int g_journal_switcher_state = GJ_SWITCHER_WORKING; 236 static int g_journal_switcher_wokenup = 0; 237 static int g_journal_sync_requested = 0; 238 239 #ifdef GJ_MEMDEBUG 240 struct meminfo { 241 size_t mi_size; 242 struct stack mi_stack; 243 }; 244 #endif 245 246 /* 247 * We use our own malloc/realloc/free funtions, so we can collect statistics 248 * and force journal switch when we're running out of cache. 249 */ 250 static void * 251 gj_malloc(size_t size, int flags) 252 { 253 void *p; 254 #ifdef GJ_MEMDEBUG 255 struct meminfo *mi; 256 #endif 257 258 mtx_lock(&g_journal_cache_mtx); 259 if (g_journal_cache_limit > 0 && !g_journal_switcher_wokenup && 260 g_journal_cache_used + size > g_journal_cache_low) { 261 GJ_DEBUG(1, "No cache, waking up the switcher."); 262 g_journal_switcher_wokenup = 1; 263 wakeup(&g_journal_switcher_state); 264 } 265 if ((flags & M_NOWAIT) && g_journal_cache_limit > 0 && 266 g_journal_cache_used + size > g_journal_cache_limit) { 267 mtx_unlock(&g_journal_cache_mtx); 268 g_journal_cache_alloc_failures++; 269 return (NULL); 270 } 271 g_journal_cache_used += size; 272 mtx_unlock(&g_journal_cache_mtx); 273 flags &= ~M_NOWAIT; 274 #ifndef GJ_MEMDEBUG 275 p = malloc(size, M_JOURNAL, flags | M_WAITOK); 276 #else 277 mi = malloc(sizeof(*mi) + size, M_JOURNAL, flags | M_WAITOK); 278 p = (u_char *)mi + sizeof(*mi); 279 mi->mi_size = size; 280 stack_save(&mi->mi_stack); 281 #endif 282 return (p); 283 } 284 285 static void 286 gj_free(void *p, size_t size) 287 { 288 #ifdef GJ_MEMDEBUG 289 struct meminfo *mi; 290 #endif 291 292 KASSERT(p != NULL, ("p=NULL")); 293 KASSERT(size > 0, ("size=0")); 294 mtx_lock(&g_journal_cache_mtx); 295 KASSERT(g_journal_cache_used >= size, ("Freeing too much?")); 296 g_journal_cache_used -= size; 297 mtx_unlock(&g_journal_cache_mtx); 298 #ifdef GJ_MEMDEBUG 299 mi = p = (void *)((u_char *)p - sizeof(*mi)); 300 if (mi->mi_size != size) { 301 printf("GJOURNAL: Size mismatch! %zu != %zu\n", size, 302 mi->mi_size); 303 printf("GJOURNAL: Alloc backtrace:\n"); 304 stack_print(&mi->mi_stack); 305 printf("GJOURNAL: Free backtrace:\n"); 306 kdb_backtrace(); 307 } 308 #endif 309 free(p, M_JOURNAL); 310 } 311 312 static void * 313 gj_realloc(void *p, size_t size, size_t oldsize) 314 { 315 void *np; 316 317 #ifndef GJ_MEMDEBUG 318 mtx_lock(&g_journal_cache_mtx); 319 g_journal_cache_used -= oldsize; 320 g_journal_cache_used += size; 321 mtx_unlock(&g_journal_cache_mtx); 322 np = realloc(p, size, M_JOURNAL, M_WAITOK); 323 #else 324 np = gj_malloc(size, M_WAITOK); 325 bcopy(p, np, MIN(oldsize, size)); 326 gj_free(p, oldsize); 327 #endif 328 return (np); 329 } 330 331 static void 332 g_journal_check_overflow(struct g_journal_softc *sc) 333 { 334 off_t length, used; 335 336 if ((sc->sc_active.jj_offset < sc->sc_inactive.jj_offset && 337 sc->sc_journal_offset >= sc->sc_inactive.jj_offset) || 338 (sc->sc_active.jj_offset > sc->sc_inactive.jj_offset && 339 sc->sc_journal_offset >= sc->sc_inactive.jj_offset && 340 sc->sc_journal_offset < sc->sc_active.jj_offset)) { 341 panic("Journal overflow " 342 "(id = %u joffset=%jd active=%jd inactive=%jd)", 343 (unsigned)sc->sc_id, 344 (intmax_t)sc->sc_journal_offset, 345 (intmax_t)sc->sc_active.jj_offset, 346 (intmax_t)sc->sc_inactive.jj_offset); 347 } 348 if (sc->sc_active.jj_offset < sc->sc_inactive.jj_offset) { 349 length = sc->sc_inactive.jj_offset - sc->sc_active.jj_offset; 350 used = sc->sc_journal_offset - sc->sc_active.jj_offset; 351 } else { 352 length = sc->sc_jend - sc->sc_active.jj_offset; 353 length += sc->sc_inactive.jj_offset - sc->sc_jstart; 354 if (sc->sc_journal_offset >= sc->sc_active.jj_offset) 355 used = sc->sc_journal_offset - sc->sc_active.jj_offset; 356 else { 357 used = sc->sc_jend - sc->sc_active.jj_offset; 358 used += sc->sc_journal_offset - sc->sc_jstart; 359 } 360 } 361 /* Already woken up? */ 362 if (g_journal_switcher_wokenup) 363 return; 364 /* 365 * If the active journal takes more than g_journal_force_switch precent 366 * of free journal space, we force journal switch. 367 */ 368 KASSERT(length > 0, 369 ("length=%jd used=%jd active=%jd inactive=%jd joffset=%jd", 370 (intmax_t)length, (intmax_t)used, 371 (intmax_t)sc->sc_active.jj_offset, 372 (intmax_t)sc->sc_inactive.jj_offset, 373 (intmax_t)sc->sc_journal_offset)); 374 if ((used * 100) / length > g_journal_force_switch) { 375 g_journal_stats_journal_full++; 376 GJ_DEBUG(1, "Journal %s %jd%% full, forcing journal switch.", 377 sc->sc_name, (used * 100) / length); 378 mtx_lock(&g_journal_cache_mtx); 379 g_journal_switcher_wokenup = 1; 380 wakeup(&g_journal_switcher_state); 381 mtx_unlock(&g_journal_cache_mtx); 382 } 383 } 384 385 static void 386 g_journal_orphan(struct g_consumer *cp) 387 { 388 struct g_journal_softc *sc; 389 char name[256]; 390 int error; 391 392 g_topology_assert(); 393 sc = cp->geom->softc; 394 strlcpy(name, cp->provider->name, sizeof(name)); 395 GJ_DEBUG(0, "Lost provider %s.", name); 396 if (sc == NULL) 397 return; 398 error = g_journal_destroy(sc); 399 if (error == 0) 400 GJ_DEBUG(0, "Journal %s destroyed.", name); 401 else { 402 GJ_DEBUG(0, "Cannot destroy journal %s (error=%d). " 403 "Destroy it manually after last close.", sc->sc_name, 404 error); 405 } 406 } 407 408 static int 409 g_journal_access(struct g_provider *pp, int acr, int acw, int ace) 410 { 411 struct g_journal_softc *sc; 412 int dcr, dcw, dce; 413 414 g_topology_assert(); 415 GJ_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, 416 acr, acw, ace); 417 418 dcr = pp->acr + acr; 419 dcw = pp->acw + acw; 420 dce = pp->ace + ace; 421 422 sc = pp->geom->softc; 423 if (sc == NULL || (sc->sc_flags & GJF_DEVICE_DESTROY)) { 424 if (acr <= 0 && acw <= 0 && ace <= 0) 425 return (0); 426 else 427 return (ENXIO); 428 } 429 if (pp->acw == 0 && dcw > 0) { 430 GJ_DEBUG(1, "Marking %s as dirty.", sc->sc_name); 431 sc->sc_flags &= ~GJF_DEVICE_CLEAN; 432 g_topology_unlock(); 433 g_journal_metadata_update(sc); 434 g_topology_lock(); 435 } /* else if (pp->acw == 0 && dcw > 0 && JEMPTY(sc)) { 436 GJ_DEBUG(1, "Marking %s as clean.", sc->sc_name); 437 sc->sc_flags |= GJF_DEVICE_CLEAN; 438 g_topology_unlock(); 439 g_journal_metadata_update(sc); 440 g_topology_lock(); 441 } */ 442 return (0); 443 } 444 445 static void 446 g_journal_header_encode(struct g_journal_header *hdr, u_char *data) 447 { 448 449 bcopy(GJ_HEADER_MAGIC, data, sizeof(GJ_HEADER_MAGIC)); 450 data += sizeof(GJ_HEADER_MAGIC); 451 le32enc(data, hdr->jh_journal_id); 452 data += 4; 453 le32enc(data, hdr->jh_journal_next_id); 454 } 455 456 static int 457 g_journal_header_decode(const u_char *data, struct g_journal_header *hdr) 458 { 459 460 bcopy(data, hdr->jh_magic, sizeof(hdr->jh_magic)); 461 data += sizeof(hdr->jh_magic); 462 if (bcmp(hdr->jh_magic, GJ_HEADER_MAGIC, sizeof(GJ_HEADER_MAGIC)) != 0) 463 return (EINVAL); 464 hdr->jh_journal_id = le32dec(data); 465 data += 4; 466 hdr->jh_journal_next_id = le32dec(data); 467 return (0); 468 } 469 470 static void 471 g_journal_flush_cache(struct g_journal_softc *sc) 472 { 473 struct bintime bt; 474 int error; 475 476 if (sc->sc_bio_flush == 0) 477 return; 478 GJ_TIMER_START(1, &bt); 479 if (sc->sc_bio_flush & GJ_FLUSH_JOURNAL) { 480 error = g_io_flush(sc->sc_jconsumer); 481 GJ_DEBUG(error == 0 ? 2 : 0, "Flush cache of %s: error=%d.", 482 sc->sc_jconsumer->provider->name, error); 483 } 484 if (sc->sc_bio_flush & GJ_FLUSH_DATA) { 485 /* 486 * TODO: This could be called in parallel with the 487 * previous call. 488 */ 489 error = g_io_flush(sc->sc_dconsumer); 490 GJ_DEBUG(error == 0 ? 2 : 0, "Flush cache of %s: error=%d.", 491 sc->sc_dconsumer->provider->name, error); 492 } 493 GJ_TIMER_STOP(1, &bt, "Cache flush time"); 494 } 495 496 static int 497 g_journal_write_header(struct g_journal_softc *sc) 498 { 499 struct g_journal_header hdr; 500 struct g_consumer *cp; 501 u_char *buf; 502 int error; 503 504 cp = sc->sc_jconsumer; 505 buf = gj_malloc(cp->provider->sectorsize, M_WAITOK); 506 507 strlcpy(hdr.jh_magic, GJ_HEADER_MAGIC, sizeof(hdr.jh_magic)); 508 hdr.jh_journal_id = sc->sc_journal_id; 509 hdr.jh_journal_next_id = sc->sc_journal_next_id; 510 g_journal_header_encode(&hdr, buf); 511 error = g_write_data(cp, sc->sc_journal_offset, buf, 512 cp->provider->sectorsize); 513 /* if (error == 0) */ 514 sc->sc_journal_offset += cp->provider->sectorsize; 515 516 gj_free(buf, cp->provider->sectorsize); 517 return (error); 518 } 519 520 /* 521 * Every journal record has a header and data following it. 522 * Functions below are used to decode the header before storing it to 523 * little endian and to encode it after reading to system endianness. 524 */ 525 static void 526 g_journal_record_header_encode(struct g_journal_record_header *hdr, 527 u_char *data) 528 { 529 struct g_journal_entry *ent; 530 u_int i; 531 532 bcopy(GJ_RECORD_HEADER_MAGIC, data, sizeof(GJ_RECORD_HEADER_MAGIC)); 533 data += sizeof(GJ_RECORD_HEADER_MAGIC); 534 le32enc(data, hdr->jrh_journal_id); 535 data += 8; 536 le16enc(data, hdr->jrh_nentries); 537 data += 2; 538 bcopy(hdr->jrh_sum, data, sizeof(hdr->jrh_sum)); 539 data += 8; 540 for (i = 0; i < hdr->jrh_nentries; i++) { 541 ent = &hdr->jrh_entries[i]; 542 le64enc(data, ent->je_joffset); 543 data += 8; 544 le64enc(data, ent->je_offset); 545 data += 8; 546 le64enc(data, ent->je_length); 547 data += 8; 548 } 549 } 550 551 static int 552 g_journal_record_header_decode(const u_char *data, 553 struct g_journal_record_header *hdr) 554 { 555 struct g_journal_entry *ent; 556 u_int i; 557 558 bcopy(data, hdr->jrh_magic, sizeof(hdr->jrh_magic)); 559 data += sizeof(hdr->jrh_magic); 560 if (strcmp(hdr->jrh_magic, GJ_RECORD_HEADER_MAGIC) != 0) 561 return (EINVAL); 562 hdr->jrh_journal_id = le32dec(data); 563 data += 8; 564 hdr->jrh_nentries = le16dec(data); 565 data += 2; 566 if (hdr->jrh_nentries > GJ_RECORD_HEADER_NENTRIES) 567 return (EINVAL); 568 bcopy(data, hdr->jrh_sum, sizeof(hdr->jrh_sum)); 569 data += 8; 570 for (i = 0; i < hdr->jrh_nentries; i++) { 571 ent = &hdr->jrh_entries[i]; 572 ent->je_joffset = le64dec(data); 573 data += 8; 574 ent->je_offset = le64dec(data); 575 data += 8; 576 ent->je_length = le64dec(data); 577 data += 8; 578 } 579 return (0); 580 } 581 582 /* 583 * Function reads metadata from a provider (via the given consumer), decodes 584 * it to system endianness and verifies its correctness. 585 */ 586 static int 587 g_journal_metadata_read(struct g_consumer *cp, struct g_journal_metadata *md) 588 { 589 struct g_provider *pp; 590 u_char *buf; 591 int error; 592 593 g_topology_assert(); 594 595 error = g_access(cp, 1, 0, 0); 596 if (error != 0) 597 return (error); 598 pp = cp->provider; 599 g_topology_unlock(); 600 /* Metadata is stored in last sector. */ 601 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 602 &error); 603 g_topology_lock(); 604 g_access(cp, -1, 0, 0); 605 if (buf == NULL) { 606 GJ_DEBUG(1, "Cannot read metadata from %s (error=%d).", 607 cp->provider->name, error); 608 return (error); 609 } 610 611 /* Decode metadata. */ 612 error = journal_metadata_decode(buf, md); 613 g_free(buf); 614 /* Is this is gjournal provider at all? */ 615 if (strcmp(md->md_magic, G_JOURNAL_MAGIC) != 0) 616 return (EINVAL); 617 /* 618 * Are we able to handle this version of metadata? 619 * We only maintain backward compatibility. 620 */ 621 if (md->md_version > G_JOURNAL_VERSION) { 622 GJ_DEBUG(0, 623 "Kernel module is too old to handle metadata from %s.", 624 cp->provider->name); 625 return (EINVAL); 626 } 627 /* Is checksum correct? */ 628 if (error != 0) { 629 GJ_DEBUG(0, "MD5 metadata hash mismatch for provider %s.", 630 cp->provider->name); 631 return (error); 632 } 633 return (0); 634 } 635 636 /* 637 * Two functions below are responsible for updating metadata. 638 * Only metadata on the data provider is updated (we need to update 639 * information about active journal in there). 640 */ 641 static void 642 g_journal_metadata_done(struct bio *bp) 643 { 644 645 /* 646 * There is not much we can do on error except informing about it. 647 */ 648 if (bp->bio_error != 0) { 649 GJ_LOGREQ(0, bp, "Cannot update metadata (error=%d).", 650 bp->bio_error); 651 } else { 652 GJ_LOGREQ(2, bp, "Metadata updated."); 653 } 654 gj_free(bp->bio_data, bp->bio_length); 655 g_destroy_bio(bp); 656 } 657 658 static void 659 g_journal_metadata_update(struct g_journal_softc *sc) 660 { 661 struct g_journal_metadata md; 662 struct g_consumer *cp; 663 struct bio *bp; 664 u_char *sector; 665 666 cp = sc->sc_dconsumer; 667 sector = gj_malloc(cp->provider->sectorsize, M_WAITOK); 668 strlcpy(md.md_magic, G_JOURNAL_MAGIC, sizeof(md.md_magic)); 669 md.md_version = G_JOURNAL_VERSION; 670 md.md_id = sc->sc_id; 671 md.md_type = sc->sc_orig_type; 672 md.md_jstart = sc->sc_jstart; 673 md.md_jend = sc->sc_jend; 674 md.md_joffset = sc->sc_inactive.jj_offset; 675 md.md_jid = sc->sc_journal_previous_id; 676 md.md_flags = 0; 677 if (sc->sc_flags & GJF_DEVICE_CLEAN) 678 md.md_flags |= GJ_FLAG_CLEAN; 679 680 if (sc->sc_flags & GJF_DEVICE_HARDCODED) 681 strlcpy(md.md_provider, sc->sc_name, sizeof(md.md_provider)); 682 else 683 bzero(md.md_provider, sizeof(md.md_provider)); 684 md.md_provsize = cp->provider->mediasize; 685 journal_metadata_encode(&md, sector); 686 687 /* 688 * Flush the cache, so we know all data are on disk. 689 * We write here informations like "journal is consistent", so we need 690 * to be sure it is. Without BIO_FLUSH here, we can end up in situation 691 * where metadata is stored on disk, but not all data. 692 */ 693 g_journal_flush_cache(sc); 694 695 bp = g_alloc_bio(); 696 bp->bio_offset = cp->provider->mediasize - cp->provider->sectorsize; 697 bp->bio_length = cp->provider->sectorsize; 698 bp->bio_data = sector; 699 bp->bio_cmd = BIO_WRITE; 700 if (!(sc->sc_flags & GJF_DEVICE_DESTROY)) { 701 bp->bio_done = g_journal_metadata_done; 702 g_io_request(bp, cp); 703 } else { 704 bp->bio_done = NULL; 705 g_io_request(bp, cp); 706 biowait(bp, "gjmdu"); 707 g_journal_metadata_done(bp); 708 } 709 710 /* 711 * Be sure metadata reached the disk. 712 */ 713 g_journal_flush_cache(sc); 714 } 715 716 /* 717 * This is where the I/O request comes from the GEOM. 718 */ 719 static void 720 g_journal_start(struct bio *bp) 721 { 722 struct g_journal_softc *sc; 723 724 sc = bp->bio_to->geom->softc; 725 GJ_LOGREQ(3, bp, "Request received."); 726 727 switch (bp->bio_cmd) { 728 case BIO_READ: 729 case BIO_WRITE: 730 mtx_lock(&sc->sc_mtx); 731 bioq_insert_tail(&sc->sc_regular_queue, bp); 732 wakeup(sc); 733 mtx_unlock(&sc->sc_mtx); 734 return; 735 case BIO_GETATTR: 736 if (strcmp(bp->bio_attribute, "GJOURNAL::provider") == 0) { 737 strlcpy(bp->bio_data, bp->bio_to->name, bp->bio_length); 738 bp->bio_completed = strlen(bp->bio_to->name) + 1; 739 g_io_deliver(bp, 0); 740 return; 741 } 742 /* FALLTHROUGH */ 743 case BIO_DELETE: 744 default: 745 g_io_deliver(bp, EOPNOTSUPP); 746 return; 747 } 748 } 749 750 static void 751 g_journal_std_done(struct bio *bp) 752 { 753 struct g_journal_softc *sc; 754 755 sc = bp->bio_from->geom->softc; 756 mtx_lock(&sc->sc_mtx); 757 bioq_insert_tail(&sc->sc_back_queue, bp); 758 wakeup(sc); 759 mtx_unlock(&sc->sc_mtx); 760 } 761 762 static struct bio * 763 g_journal_new_bio(off_t start, off_t end, off_t joffset, u_char *data, 764 int flags) 765 { 766 struct bio *bp; 767 768 bp = g_alloc_bio(); 769 bp->bio_offset = start; 770 bp->bio_joffset = joffset; 771 bp->bio_length = end - start; 772 bp->bio_cmd = BIO_WRITE; 773 bp->bio_done = g_journal_std_done; 774 if (data == NULL) 775 bp->bio_data = NULL; 776 else { 777 bp->bio_data = gj_malloc(bp->bio_length, flags); 778 if (bp->bio_data != NULL) 779 bcopy(data, bp->bio_data, bp->bio_length); 780 } 781 return (bp); 782 } 783 784 #define g_journal_insert_bio(head, bp, flags) \ 785 g_journal_insert((head), (bp)->bio_offset, \ 786 (bp)->bio_offset + (bp)->bio_length, (bp)->bio_joffset, \ 787 (bp)->bio_data, flags) 788 /* 789 * The function below does a lot more than just inserting bio to the queue. 790 * It keeps the queue sorted by offset and ensures that there are no doubled 791 * data (it combines bios where ranges overlap). 792 * 793 * The function returns the number of bios inserted (as bio can be splitted). 794 */ 795 static int 796 g_journal_insert(struct bio **head, off_t nstart, off_t nend, off_t joffset, 797 u_char *data, int flags) 798 { 799 struct bio *nbp, *cbp, *pbp; 800 off_t cstart, cend; 801 u_char *tmpdata; 802 int n; 803 804 GJ_DEBUG(3, "INSERT(%p): (%jd, %jd, %jd)", *head, nstart, nend, 805 joffset); 806 n = 0; 807 pbp = NULL; 808 GJQ_FOREACH(*head, cbp) { 809 cstart = cbp->bio_offset; 810 cend = cbp->bio_offset + cbp->bio_length; 811 812 if (nstart >= cend) { 813 /* 814 * +-------------+ 815 * | | 816 * | current | +-------------+ 817 * | bio | | | 818 * | | | new | 819 * +-------------+ | bio | 820 * | | 821 * +-------------+ 822 */ 823 GJ_DEBUG(3, "INSERT(%p): 1", *head); 824 } else if (nend <= cstart) { 825 /* 826 * +-------------+ 827 * | | 828 * +-------------+ | current | 829 * | | | bio | 830 * | new | | | 831 * | bio | +-------------+ 832 * | | 833 * +-------------+ 834 */ 835 nbp = g_journal_new_bio(nstart, nend, joffset, data, 836 flags); 837 if (pbp == NULL) 838 *head = nbp; 839 else 840 pbp->bio_next = nbp; 841 nbp->bio_next = cbp; 842 n++; 843 GJ_DEBUG(3, "INSERT(%p): 2 (nbp=%p pbp=%p)", *head, nbp, 844 pbp); 845 goto end; 846 } else if (nstart <= cstart && nend >= cend) { 847 /* 848 * +-------------+ +-------------+ 849 * | current bio | | current bio | 850 * +---+-------------+---+ +-------------+---+ 851 * | | | | | | | 852 * | | | | | | | 853 * | +-------------+ | +-------------+ | 854 * | new bio | | new bio | 855 * +---------------------+ +-----------------+ 856 * 857 * +-------------+ +-------------+ 858 * | current bio | | current bio | 859 * +---+-------------+ +-------------+ 860 * | | | | | 861 * | | | | | 862 * | +-------------+ +-------------+ 863 * | new bio | | new bio | 864 * +-----------------+ +-------------+ 865 */ 866 g_journal_stats_bytes_skipped += cbp->bio_length; 867 cbp->bio_offset = nstart; 868 cbp->bio_joffset = joffset; 869 cbp->bio_length = cend - nstart; 870 if (cbp->bio_data != NULL) { 871 gj_free(cbp->bio_data, cend - cstart); 872 cbp->bio_data = NULL; 873 } 874 if (data != NULL) { 875 cbp->bio_data = gj_malloc(cbp->bio_length, 876 flags); 877 if (cbp->bio_data != NULL) { 878 bcopy(data, cbp->bio_data, 879 cbp->bio_length); 880 } 881 data += cend - nstart; 882 } 883 joffset += cend - nstart; 884 nstart = cend; 885 GJ_DEBUG(3, "INSERT(%p): 3 (cbp=%p)", *head, cbp); 886 } else if (nstart > cstart && nend >= cend) { 887 /* 888 * +-----------------+ +-------------+ 889 * | current bio | | current bio | 890 * | +-------------+ | +---------+---+ 891 * | | | | | | | 892 * | | | | | | | 893 * +---+-------------+ +---+---------+ | 894 * | new bio | | new bio | 895 * +-------------+ +-------------+ 896 */ 897 g_journal_stats_bytes_skipped += cend - nstart; 898 nbp = g_journal_new_bio(nstart, cend, joffset, data, 899 flags); 900 nbp->bio_next = cbp->bio_next; 901 cbp->bio_next = nbp; 902 cbp->bio_length = nstart - cstart; 903 if (cbp->bio_data != NULL) { 904 cbp->bio_data = gj_realloc(cbp->bio_data, 905 cbp->bio_length, cend - cstart); 906 } 907 if (data != NULL) 908 data += cend - nstart; 909 joffset += cend - nstart; 910 nstart = cend; 911 n++; 912 GJ_DEBUG(3, "INSERT(%p): 4 (cbp=%p)", *head, cbp); 913 } else if (nstart > cstart && nend < cend) { 914 /* 915 * +---------------------+ 916 * | current bio | 917 * | +-------------+ | 918 * | | | | 919 * | | | | 920 * +---+-------------+---+ 921 * | new bio | 922 * +-------------+ 923 */ 924 g_journal_stats_bytes_skipped += nend - nstart; 925 nbp = g_journal_new_bio(nstart, nend, joffset, data, 926 flags); 927 nbp->bio_next = cbp->bio_next; 928 cbp->bio_next = nbp; 929 if (cbp->bio_data == NULL) 930 tmpdata = NULL; 931 else 932 tmpdata = cbp->bio_data + nend - cstart; 933 nbp = g_journal_new_bio(nend, cend, 934 cbp->bio_joffset + nend - cstart, tmpdata, flags); 935 nbp->bio_next = ((struct bio *)cbp->bio_next)->bio_next; 936 ((struct bio *)cbp->bio_next)->bio_next = nbp; 937 cbp->bio_length = nstart - cstart; 938 if (cbp->bio_data != NULL) { 939 cbp->bio_data = gj_realloc(cbp->bio_data, 940 cbp->bio_length, cend - cstart); 941 } 942 n += 2; 943 GJ_DEBUG(3, "INSERT(%p): 5 (cbp=%p)", *head, cbp); 944 goto end; 945 } else if (nstart <= cstart && nend < cend) { 946 /* 947 * +-----------------+ +-------------+ 948 * | current bio | | current bio | 949 * +-------------+ | +---+---------+ | 950 * | | | | | | | 951 * | | | | | | | 952 * +-------------+---+ | +---------+---+ 953 * | new bio | | new bio | 954 * +-------------+ +-------------+ 955 */ 956 g_journal_stats_bytes_skipped += nend - nstart; 957 nbp = g_journal_new_bio(nstart, nend, joffset, data, 958 flags); 959 if (pbp == NULL) 960 *head = nbp; 961 else 962 pbp->bio_next = nbp; 963 nbp->bio_next = cbp; 964 cbp->bio_offset = nend; 965 cbp->bio_length = cend - nend; 966 cbp->bio_joffset += nend - cstart; 967 tmpdata = cbp->bio_data; 968 if (tmpdata != NULL) { 969 cbp->bio_data = gj_malloc(cbp->bio_length, 970 flags); 971 if (cbp->bio_data != NULL) { 972 bcopy(tmpdata + nend - cstart, 973 cbp->bio_data, cbp->bio_length); 974 } 975 gj_free(tmpdata, cend - cstart); 976 } 977 n++; 978 GJ_DEBUG(3, "INSERT(%p): 6 (cbp=%p)", *head, cbp); 979 goto end; 980 } 981 if (nstart == nend) 982 goto end; 983 pbp = cbp; 984 } 985 nbp = g_journal_new_bio(nstart, nend, joffset, data, flags); 986 if (pbp == NULL) 987 *head = nbp; 988 else 989 pbp->bio_next = nbp; 990 nbp->bio_next = NULL; 991 n++; 992 GJ_DEBUG(3, "INSERT(%p): 8 (nbp=%p pbp=%p)", *head, nbp, pbp); 993 end: 994 if (g_journal_debug >= 3) { 995 GJQ_FOREACH(*head, cbp) { 996 GJ_DEBUG(3, "ELEMENT: %p (%jd, %jd, %jd, %p)", cbp, 997 (intmax_t)cbp->bio_offset, 998 (intmax_t)cbp->bio_length, 999 (intmax_t)cbp->bio_joffset, cbp->bio_data); 1000 } 1001 GJ_DEBUG(3, "INSERT(%p): DONE %d", *head, n); 1002 } 1003 return (n); 1004 } 1005 1006 /* 1007 * The function combines neighbour bios trying to squeeze as much data as 1008 * possible into one bio. 1009 * 1010 * The function returns the number of bios combined (negative value). 1011 */ 1012 static int 1013 g_journal_optimize(struct bio *head) 1014 { 1015 struct bio *cbp, *pbp; 1016 int n; 1017 1018 n = 0; 1019 pbp = NULL; 1020 GJQ_FOREACH(head, cbp) { 1021 /* Skip bios which has to be read first. */ 1022 if (cbp->bio_data == NULL) { 1023 pbp = NULL; 1024 continue; 1025 } 1026 /* There is no previous bio yet. */ 1027 if (pbp == NULL) { 1028 pbp = cbp; 1029 continue; 1030 } 1031 /* Is this a neighbour bio? */ 1032 if (pbp->bio_offset + pbp->bio_length != cbp->bio_offset) { 1033 /* Be sure that bios queue is sorted. */ 1034 KASSERT(pbp->bio_offset + pbp->bio_length < cbp->bio_offset, 1035 ("poffset=%jd plength=%jd coffset=%jd", 1036 (intmax_t)pbp->bio_offset, 1037 (intmax_t)pbp->bio_length, 1038 (intmax_t)cbp->bio_offset)); 1039 pbp = cbp; 1040 continue; 1041 } 1042 /* Be sure we don't end up with too big bio. */ 1043 if (pbp->bio_length + cbp->bio_length > MAXPHYS) { 1044 pbp = cbp; 1045 continue; 1046 } 1047 /* Ok, we can join bios. */ 1048 GJ_LOGREQ(4, pbp, "Join: "); 1049 GJ_LOGREQ(4, cbp, "and: "); 1050 pbp->bio_data = gj_realloc(pbp->bio_data, 1051 pbp->bio_length + cbp->bio_length, pbp->bio_length); 1052 bcopy(cbp->bio_data, pbp->bio_data + pbp->bio_length, 1053 cbp->bio_length); 1054 gj_free(cbp->bio_data, cbp->bio_length); 1055 pbp->bio_length += cbp->bio_length; 1056 pbp->bio_next = cbp->bio_next; 1057 g_destroy_bio(cbp); 1058 cbp = pbp; 1059 g_journal_stats_combined_ios++; 1060 n--; 1061 GJ_LOGREQ(4, pbp, "Got: "); 1062 } 1063 return (n); 1064 } 1065 1066 /* 1067 * TODO: Update comment. 1068 * These are functions responsible for copying one portion of data from journal 1069 * to the destination provider. 1070 * The order goes like this: 1071 * 1. Read the header, which contains informations about data blocks 1072 * following it. 1073 * 2. Read the data blocks from the journal. 1074 * 3. Write the data blocks on the data provider. 1075 * 1076 * g_journal_copy_start() 1077 * g_journal_copy_done() - got finished write request, logs potential errors. 1078 */ 1079 1080 /* 1081 * When there is no data in cache, this function is used to read it. 1082 */ 1083 static void 1084 g_journal_read_first(struct g_journal_softc *sc, struct bio *bp) 1085 { 1086 struct bio *cbp; 1087 1088 /* 1089 * We were short in memory, so data was freed. 1090 * In that case we need to read it back from journal. 1091 */ 1092 cbp = g_alloc_bio(); 1093 cbp->bio_cflags = bp->bio_cflags; 1094 cbp->bio_parent = bp; 1095 cbp->bio_offset = bp->bio_joffset; 1096 cbp->bio_length = bp->bio_length; 1097 cbp->bio_data = gj_malloc(bp->bio_length, M_WAITOK); 1098 cbp->bio_cmd = BIO_READ; 1099 cbp->bio_done = g_journal_std_done; 1100 GJ_LOGREQ(4, cbp, "READ FIRST"); 1101 g_io_request(cbp, sc->sc_jconsumer); 1102 g_journal_cache_misses++; 1103 } 1104 1105 static void 1106 g_journal_copy_send(struct g_journal_softc *sc) 1107 { 1108 struct bio *bioq, *bp, *lbp; 1109 1110 bioq = lbp = NULL; 1111 mtx_lock(&sc->sc_mtx); 1112 for (; sc->sc_copy_in_progress < g_journal_parallel_copies;) { 1113 bp = GJQ_FIRST(sc->sc_inactive.jj_queue); 1114 if (bp == NULL) 1115 break; 1116 GJQ_REMOVE(sc->sc_inactive.jj_queue, bp); 1117 sc->sc_copy_in_progress++; 1118 GJQ_INSERT_AFTER(bioq, bp, lbp); 1119 lbp = bp; 1120 } 1121 mtx_unlock(&sc->sc_mtx); 1122 if (g_journal_do_optimize) 1123 sc->sc_copy_in_progress += g_journal_optimize(bioq); 1124 while ((bp = GJQ_FIRST(bioq)) != NULL) { 1125 GJQ_REMOVE(bioq, bp); 1126 GJQ_INSERT_HEAD(sc->sc_copy_queue, bp); 1127 bp->bio_cflags = GJ_BIO_COPY; 1128 if (bp->bio_data == NULL) 1129 g_journal_read_first(sc, bp); 1130 else { 1131 bp->bio_joffset = 0; 1132 GJ_LOGREQ(4, bp, "SEND"); 1133 g_io_request(bp, sc->sc_dconsumer); 1134 } 1135 } 1136 } 1137 1138 static void 1139 g_journal_copy_start(struct g_journal_softc *sc) 1140 { 1141 1142 /* 1143 * Remember in metadata that we're starting to copy journaled data 1144 * to the data provider. 1145 * In case of power failure, we will copy these data once again on boot. 1146 */ 1147 if (!sc->sc_journal_copying) { 1148 sc->sc_journal_copying = 1; 1149 GJ_DEBUG(1, "Starting copy of journal."); 1150 g_journal_metadata_update(sc); 1151 } 1152 g_journal_copy_send(sc); 1153 } 1154 1155 /* 1156 * Data block has been read from the journal provider. 1157 */ 1158 static int 1159 g_journal_copy_read_done(struct bio *bp) 1160 { 1161 struct g_journal_softc *sc; 1162 struct g_consumer *cp; 1163 struct bio *pbp; 1164 1165 KASSERT(bp->bio_cflags == GJ_BIO_COPY, 1166 ("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_COPY)); 1167 1168 sc = bp->bio_from->geom->softc; 1169 pbp = bp->bio_parent; 1170 1171 if (bp->bio_error != 0) { 1172 GJ_DEBUG(0, "Error while reading data from %s (error=%d).", 1173 bp->bio_to->name, bp->bio_error); 1174 /* 1175 * We will not be able to deliver WRITE request as well. 1176 */ 1177 gj_free(bp->bio_data, bp->bio_length); 1178 g_destroy_bio(pbp); 1179 g_destroy_bio(bp); 1180 sc->sc_copy_in_progress--; 1181 return (1); 1182 } 1183 pbp->bio_data = bp->bio_data; 1184 cp = sc->sc_dconsumer; 1185 g_io_request(pbp, cp); 1186 GJ_LOGREQ(4, bp, "READ DONE"); 1187 g_destroy_bio(bp); 1188 return (0); 1189 } 1190 1191 /* 1192 * Data block has been written to the data provider. 1193 */ 1194 static void 1195 g_journal_copy_write_done(struct bio *bp) 1196 { 1197 struct g_journal_softc *sc; 1198 1199 KASSERT(bp->bio_cflags == GJ_BIO_COPY, 1200 ("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_COPY)); 1201 1202 sc = bp->bio_from->geom->softc; 1203 sc->sc_copy_in_progress--; 1204 1205 if (bp->bio_error != 0) { 1206 GJ_LOGREQ(0, bp, "[copy] Error while writing data (error=%d)", 1207 bp->bio_error); 1208 } 1209 GJQ_REMOVE(sc->sc_copy_queue, bp); 1210 gj_free(bp->bio_data, bp->bio_length); 1211 GJ_LOGREQ(4, bp, "DONE"); 1212 g_destroy_bio(bp); 1213 1214 if (sc->sc_copy_in_progress == 0) { 1215 /* 1216 * This was the last write request for this journal. 1217 */ 1218 GJ_DEBUG(1, "Data has been copied."); 1219 sc->sc_journal_copying = 0; 1220 } 1221 } 1222 1223 static void g_journal_flush_done(struct bio *bp); 1224 1225 /* 1226 * Flush one record onto active journal provider. 1227 */ 1228 static void 1229 g_journal_flush(struct g_journal_softc *sc) 1230 { 1231 struct g_journal_record_header hdr; 1232 struct g_journal_entry *ent; 1233 struct g_provider *pp; 1234 struct bio **bioq; 1235 struct bio *bp, *fbp, *pbp; 1236 off_t joffset, size; 1237 u_char *data, hash[16]; 1238 MD5_CTX ctx; 1239 u_int i; 1240 1241 if (sc->sc_current_count == 0) 1242 return; 1243 1244 size = 0; 1245 pp = sc->sc_jprovider; 1246 GJ_VALIDATE_OFFSET(sc->sc_journal_offset, sc); 1247 joffset = sc->sc_journal_offset; 1248 1249 GJ_DEBUG(2, "Storing %d journal entries on %s at %jd.", 1250 sc->sc_current_count, pp->name, (intmax_t)joffset); 1251 1252 /* 1253 * Store 'journal id', so we know to which journal this record belongs. 1254 */ 1255 hdr.jrh_journal_id = sc->sc_journal_id; 1256 /* Could be less than g_journal_record_entries if called due timeout. */ 1257 hdr.jrh_nentries = MIN(sc->sc_current_count, g_journal_record_entries); 1258 strlcpy(hdr.jrh_magic, GJ_RECORD_HEADER_MAGIC, sizeof(hdr.jrh_magic)); 1259 1260 bioq = &sc->sc_active.jj_queue; 1261 pbp = sc->sc_flush_queue; 1262 1263 fbp = g_alloc_bio(); 1264 fbp->bio_parent = NULL; 1265 fbp->bio_cflags = GJ_BIO_JOURNAL; 1266 fbp->bio_offset = -1; 1267 fbp->bio_joffset = joffset; 1268 fbp->bio_length = pp->sectorsize; 1269 fbp->bio_cmd = BIO_WRITE; 1270 fbp->bio_done = g_journal_std_done; 1271 GJQ_INSERT_AFTER(sc->sc_flush_queue, fbp, pbp); 1272 pbp = fbp; 1273 fbp->bio_to = pp; 1274 GJ_LOGREQ(4, fbp, "FLUSH_OUT"); 1275 joffset += pp->sectorsize; 1276 sc->sc_flush_count++; 1277 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) 1278 MD5Init(&ctx); 1279 1280 for (i = 0; i < hdr.jrh_nentries; i++) { 1281 bp = sc->sc_current_queue; 1282 KASSERT(bp != NULL, ("NULL bp")); 1283 bp->bio_to = pp; 1284 GJ_LOGREQ(4, bp, "FLUSHED"); 1285 sc->sc_current_queue = bp->bio_next; 1286 bp->bio_next = NULL; 1287 sc->sc_current_count--; 1288 1289 /* Add to the header. */ 1290 ent = &hdr.jrh_entries[i]; 1291 ent->je_offset = bp->bio_offset; 1292 ent->je_joffset = joffset; 1293 ent->je_length = bp->bio_length; 1294 size += ent->je_length; 1295 1296 data = bp->bio_data; 1297 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) 1298 MD5Update(&ctx, data, ent->je_length); 1299 g_reset_bio(bp); 1300 bp->bio_cflags = GJ_BIO_JOURNAL; 1301 bp->bio_offset = ent->je_offset; 1302 bp->bio_joffset = ent->je_joffset; 1303 bp->bio_length = ent->je_length; 1304 bp->bio_data = data; 1305 bp->bio_cmd = BIO_WRITE; 1306 bp->bio_done = g_journal_std_done; 1307 GJQ_INSERT_AFTER(sc->sc_flush_queue, bp, pbp); 1308 pbp = bp; 1309 bp->bio_to = pp; 1310 GJ_LOGREQ(4, bp, "FLUSH_OUT"); 1311 joffset += bp->bio_length; 1312 sc->sc_flush_count++; 1313 1314 /* 1315 * Add request to the active sc_journal_queue queue. 1316 * This is our cache. After journal switch we don't have to 1317 * read the data from the inactive journal, because we keep 1318 * it in memory. 1319 */ 1320 g_journal_insert(bioq, ent->je_offset, 1321 ent->je_offset + ent->je_length, ent->je_joffset, data, 1322 M_NOWAIT); 1323 } 1324 1325 /* 1326 * After all requests, store valid header. 1327 */ 1328 data = gj_malloc(pp->sectorsize, M_WAITOK); 1329 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) { 1330 MD5Final(hash, &ctx); 1331 bcopy(hash, hdr.jrh_sum, sizeof(hdr.jrh_sum)); 1332 } 1333 g_journal_record_header_encode(&hdr, data); 1334 fbp->bio_data = data; 1335 1336 sc->sc_journal_offset = joffset; 1337 1338 g_journal_check_overflow(sc); 1339 } 1340 1341 /* 1342 * Flush request finished. 1343 */ 1344 static void 1345 g_journal_flush_done(struct bio *bp) 1346 { 1347 struct g_journal_softc *sc; 1348 struct g_consumer *cp; 1349 1350 KASSERT((bp->bio_cflags & GJ_BIO_MASK) == GJ_BIO_JOURNAL, 1351 ("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_JOURNAL)); 1352 1353 cp = bp->bio_from; 1354 sc = cp->geom->softc; 1355 sc->sc_flush_in_progress--; 1356 1357 if (bp->bio_error != 0) { 1358 GJ_LOGREQ(0, bp, "[flush] Error while writing data (error=%d)", 1359 bp->bio_error); 1360 } 1361 gj_free(bp->bio_data, bp->bio_length); 1362 GJ_LOGREQ(4, bp, "DONE"); 1363 g_destroy_bio(bp); 1364 } 1365 1366 static void g_journal_release_delayed(struct g_journal_softc *sc); 1367 1368 static void 1369 g_journal_flush_send(struct g_journal_softc *sc) 1370 { 1371 struct g_consumer *cp; 1372 struct bio *bioq, *bp, *lbp; 1373 1374 cp = sc->sc_jconsumer; 1375 bioq = lbp = NULL; 1376 while (sc->sc_flush_in_progress < g_journal_parallel_flushes) { 1377 /* Send one flush requests to the active journal. */ 1378 bp = GJQ_FIRST(sc->sc_flush_queue); 1379 if (bp != NULL) { 1380 GJQ_REMOVE(sc->sc_flush_queue, bp); 1381 sc->sc_flush_count--; 1382 bp->bio_offset = bp->bio_joffset; 1383 bp->bio_joffset = 0; 1384 sc->sc_flush_in_progress++; 1385 GJQ_INSERT_AFTER(bioq, bp, lbp); 1386 lbp = bp; 1387 } 1388 /* Try to release delayed requests. */ 1389 g_journal_release_delayed(sc); 1390 /* If there are no requests to flush, leave. */ 1391 if (GJQ_FIRST(sc->sc_flush_queue) == NULL) 1392 break; 1393 } 1394 if (g_journal_do_optimize) 1395 sc->sc_flush_in_progress += g_journal_optimize(bioq); 1396 while ((bp = GJQ_FIRST(bioq)) != NULL) { 1397 GJQ_REMOVE(bioq, bp); 1398 GJ_LOGREQ(3, bp, "Flush request send"); 1399 g_io_request(bp, cp); 1400 } 1401 } 1402 1403 static void 1404 g_journal_add_current(struct g_journal_softc *sc, struct bio *bp) 1405 { 1406 int n; 1407 1408 GJ_LOGREQ(4, bp, "CURRENT %d", sc->sc_current_count); 1409 n = g_journal_insert_bio(&sc->sc_current_queue, bp, M_WAITOK); 1410 sc->sc_current_count += n; 1411 n = g_journal_optimize(sc->sc_current_queue); 1412 sc->sc_current_count += n; 1413 /* 1414 * For requests which are added to the current queue we deliver 1415 * response immediately. 1416 */ 1417 bp->bio_completed = bp->bio_length; 1418 g_io_deliver(bp, 0); 1419 if (sc->sc_current_count >= g_journal_record_entries) { 1420 /* 1421 * Let's flush one record onto active journal provider. 1422 */ 1423 g_journal_flush(sc); 1424 } 1425 } 1426 1427 static void 1428 g_journal_release_delayed(struct g_journal_softc *sc) 1429 { 1430 struct bio *bp; 1431 1432 for (;;) { 1433 /* The flush queue is full, exit. */ 1434 if (sc->sc_flush_count >= g_journal_accept_immediately) 1435 return; 1436 bp = bioq_takefirst(&sc->sc_delayed_queue); 1437 if (bp == NULL) 1438 return; 1439 sc->sc_delayed_count--; 1440 g_journal_add_current(sc, bp); 1441 } 1442 } 1443 1444 /* 1445 * Add I/O request to the current queue. If we have enough requests for one 1446 * journal record we flush them onto active journal provider. 1447 */ 1448 static void 1449 g_journal_add_request(struct g_journal_softc *sc, struct bio *bp) 1450 { 1451 1452 /* 1453 * The flush queue is full, we need to delay the request. 1454 */ 1455 if (sc->sc_delayed_count > 0 || 1456 sc->sc_flush_count >= g_journal_accept_immediately) { 1457 GJ_LOGREQ(4, bp, "DELAYED"); 1458 bioq_insert_tail(&sc->sc_delayed_queue, bp); 1459 sc->sc_delayed_count++; 1460 return; 1461 } 1462 1463 KASSERT(TAILQ_EMPTY(&sc->sc_delayed_queue.queue), 1464 ("DELAYED queue not empty.")); 1465 g_journal_add_current(sc, bp); 1466 } 1467 1468 static void g_journal_read_done(struct bio *bp); 1469 1470 /* 1471 * Try to find requested data in cache. 1472 */ 1473 static struct bio * 1474 g_journal_read_find(struct bio *head, int sorted, struct bio *pbp, off_t ostart, 1475 off_t oend) 1476 { 1477 off_t cstart, cend; 1478 struct bio *bp; 1479 1480 GJQ_FOREACH(head, bp) { 1481 if (bp->bio_offset == -1) 1482 continue; 1483 cstart = MAX(ostart, bp->bio_offset); 1484 cend = MIN(oend, bp->bio_offset + bp->bio_length); 1485 if (cend <= ostart) 1486 continue; 1487 else if (cstart >= oend) { 1488 if (!sorted) 1489 continue; 1490 else { 1491 bp = NULL; 1492 break; 1493 } 1494 } 1495 if (bp->bio_data == NULL) 1496 break; 1497 GJ_DEBUG(3, "READ(%p): (%jd, %jd) (bp=%p)", head, cstart, cend, 1498 bp); 1499 bcopy(bp->bio_data + cstart - bp->bio_offset, 1500 pbp->bio_data + cstart - pbp->bio_offset, cend - cstart); 1501 pbp->bio_completed += cend - cstart; 1502 if (pbp->bio_completed == pbp->bio_length) { 1503 /* 1504 * Cool, the whole request was in cache, deliver happy 1505 * message. 1506 */ 1507 g_io_deliver(pbp, 0); 1508 return (pbp); 1509 } 1510 break; 1511 } 1512 return (bp); 1513 } 1514 1515 /* 1516 * Try to find requested data in cache. 1517 */ 1518 static struct bio * 1519 g_journal_read_queue_find(struct bio_queue *head, struct bio *pbp, off_t ostart, 1520 off_t oend) 1521 { 1522 off_t cstart, cend; 1523 struct bio *bp; 1524 1525 TAILQ_FOREACH(bp, head, bio_queue) { 1526 cstart = MAX(ostart, bp->bio_offset); 1527 cend = MIN(oend, bp->bio_offset + bp->bio_length); 1528 if (cend <= ostart) 1529 continue; 1530 else if (cstart >= oend) 1531 continue; 1532 KASSERT(bp->bio_data != NULL, 1533 ("%s: bio_data == NULL", __func__)); 1534 GJ_DEBUG(3, "READ(%p): (%jd, %jd) (bp=%p)", head, cstart, cend, 1535 bp); 1536 bcopy(bp->bio_data + cstart - bp->bio_offset, 1537 pbp->bio_data + cstart - pbp->bio_offset, cend - cstart); 1538 pbp->bio_completed += cend - cstart; 1539 if (pbp->bio_completed == pbp->bio_length) { 1540 /* 1541 * Cool, the whole request was in cache, deliver happy 1542 * message. 1543 */ 1544 g_io_deliver(pbp, 0); 1545 return (pbp); 1546 } 1547 break; 1548 } 1549 return (bp); 1550 } 1551 1552 /* 1553 * This function is used for colecting data on read. 1554 * The complexity is because parts of the data can be stored in four different 1555 * places: 1556 * - in delayed requests 1557 * - in memory - the data not yet send to the active journal provider 1558 * - in requests which are going to be sent to the active journal 1559 * - in the active journal 1560 * - in the inactive journal 1561 * - in the data provider 1562 */ 1563 static void 1564 g_journal_read(struct g_journal_softc *sc, struct bio *pbp, off_t ostart, 1565 off_t oend) 1566 { 1567 struct bio *bp, *nbp, *head; 1568 off_t cstart, cend; 1569 u_int i, sorted = 0; 1570 1571 GJ_DEBUG(3, "READ: (%jd, %jd)", ostart, oend); 1572 1573 cstart = cend = -1; 1574 bp = NULL; 1575 head = NULL; 1576 for (i = 0; i <= 5; i++) { 1577 switch (i) { 1578 case 0: /* Delayed requests. */ 1579 head = NULL; 1580 sorted = 0; 1581 break; 1582 case 1: /* Not-yet-send data. */ 1583 head = sc->sc_current_queue; 1584 sorted = 1; 1585 break; 1586 case 2: /* In-flight to the active journal. */ 1587 head = sc->sc_flush_queue; 1588 sorted = 0; 1589 break; 1590 case 3: /* Active journal. */ 1591 head = sc->sc_active.jj_queue; 1592 sorted = 1; 1593 break; 1594 case 4: /* Inactive journal. */ 1595 /* 1596 * XXX: Here could be a race with g_journal_lowmem(). 1597 */ 1598 head = sc->sc_inactive.jj_queue; 1599 sorted = 1; 1600 break; 1601 case 5: /* In-flight to the data provider. */ 1602 head = sc->sc_copy_queue; 1603 sorted = 0; 1604 break; 1605 default: 1606 panic("gjournal %s: i=%d", __func__, i); 1607 } 1608 if (i == 0) 1609 bp = g_journal_read_queue_find(&sc->sc_delayed_queue.queue, pbp, ostart, oend); 1610 else 1611 bp = g_journal_read_find(head, sorted, pbp, ostart, oend); 1612 if (bp == pbp) { /* Got the whole request. */ 1613 GJ_DEBUG(2, "Got the whole request from %u.", i); 1614 return; 1615 } else if (bp != NULL) { 1616 cstart = MAX(ostart, bp->bio_offset); 1617 cend = MIN(oend, bp->bio_offset + bp->bio_length); 1618 GJ_DEBUG(2, "Got part of the request from %u (%jd-%jd).", 1619 i, (intmax_t)cstart, (intmax_t)cend); 1620 break; 1621 } 1622 } 1623 if (bp != NULL) { 1624 if (bp->bio_data == NULL) { 1625 nbp = g_duplicate_bio(pbp); 1626 nbp->bio_cflags = GJ_BIO_READ; 1627 nbp->bio_data = 1628 pbp->bio_data + cstart - pbp->bio_offset; 1629 nbp->bio_offset = 1630 bp->bio_joffset + cstart - bp->bio_offset; 1631 nbp->bio_length = cend - cstart; 1632 nbp->bio_done = g_journal_read_done; 1633 g_io_request(nbp, sc->sc_jconsumer); 1634 } 1635 /* 1636 * If we don't have the whole request yet, call g_journal_read() 1637 * recursively. 1638 */ 1639 if (ostart < cstart) 1640 g_journal_read(sc, pbp, ostart, cstart); 1641 if (oend > cend) 1642 g_journal_read(sc, pbp, cend, oend); 1643 } else { 1644 /* 1645 * No data in memory, no data in journal. 1646 * Its time for asking data provider. 1647 */ 1648 GJ_DEBUG(3, "READ(data): (%jd, %jd)", ostart, oend); 1649 nbp = g_duplicate_bio(pbp); 1650 nbp->bio_cflags = GJ_BIO_READ; 1651 nbp->bio_data = pbp->bio_data + ostart - pbp->bio_offset; 1652 nbp->bio_offset = ostart; 1653 nbp->bio_length = oend - ostart; 1654 nbp->bio_done = g_journal_read_done; 1655 g_io_request(nbp, sc->sc_dconsumer); 1656 /* We have the whole request, return here. */ 1657 return; 1658 } 1659 } 1660 1661 /* 1662 * Function responsible for handling finished READ requests. 1663 * Actually, g_std_done() could be used here, the only difference is that we 1664 * log error. 1665 */ 1666 static void 1667 g_journal_read_done(struct bio *bp) 1668 { 1669 struct bio *pbp; 1670 1671 KASSERT(bp->bio_cflags == GJ_BIO_READ, 1672 ("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_READ)); 1673 1674 pbp = bp->bio_parent; 1675 pbp->bio_inbed++; 1676 pbp->bio_completed += bp->bio_length; 1677 1678 if (bp->bio_error != 0) { 1679 if (pbp->bio_error == 0) 1680 pbp->bio_error = bp->bio_error; 1681 GJ_DEBUG(0, "Error while reading data from %s (error=%d).", 1682 bp->bio_to->name, bp->bio_error); 1683 } 1684 g_destroy_bio(bp); 1685 if (pbp->bio_children == pbp->bio_inbed && 1686 pbp->bio_completed == pbp->bio_length) { 1687 /* We're done. */ 1688 g_io_deliver(pbp, 0); 1689 } 1690 } 1691 1692 /* 1693 * Deactive current journal and active next one. 1694 */ 1695 static void 1696 g_journal_switch(struct g_journal_softc *sc) 1697 { 1698 struct g_provider *pp; 1699 1700 if (JEMPTY(sc)) { 1701 GJ_DEBUG(3, "No need for %s switch.", sc->sc_name); 1702 pp = LIST_FIRST(&sc->sc_geom->provider); 1703 if (!(sc->sc_flags & GJF_DEVICE_CLEAN) && pp->acw == 0) { 1704 sc->sc_flags |= GJF_DEVICE_CLEAN; 1705 GJ_DEBUG(1, "Marking %s as clean.", sc->sc_name); 1706 g_journal_metadata_update(sc); 1707 } 1708 } else { 1709 GJ_DEBUG(3, "Switching journal %s.", sc->sc_geom->name); 1710 1711 pp = sc->sc_jprovider; 1712 1713 sc->sc_journal_previous_id = sc->sc_journal_id; 1714 1715 sc->sc_journal_id = sc->sc_journal_next_id; 1716 sc->sc_journal_next_id = arc4random(); 1717 1718 GJ_VALIDATE_OFFSET(sc->sc_journal_offset, sc); 1719 1720 g_journal_write_header(sc); 1721 1722 sc->sc_inactive.jj_offset = sc->sc_active.jj_offset; 1723 sc->sc_inactive.jj_queue = sc->sc_active.jj_queue; 1724 1725 sc->sc_active.jj_offset = 1726 sc->sc_journal_offset - pp->sectorsize; 1727 sc->sc_active.jj_queue = NULL; 1728 1729 /* 1730 * Switch is done, start copying data from the (now) inactive 1731 * journal to the data provider. 1732 */ 1733 g_journal_copy_start(sc); 1734 } 1735 mtx_lock(&sc->sc_mtx); 1736 sc->sc_flags &= ~GJF_DEVICE_SWITCH; 1737 mtx_unlock(&sc->sc_mtx); 1738 } 1739 1740 static void 1741 g_journal_initialize(struct g_journal_softc *sc) 1742 { 1743 1744 sc->sc_journal_id = arc4random(); 1745 sc->sc_journal_next_id = arc4random(); 1746 sc->sc_journal_previous_id = sc->sc_journal_id; 1747 sc->sc_journal_offset = sc->sc_jstart; 1748 sc->sc_inactive.jj_offset = sc->sc_jstart; 1749 g_journal_write_header(sc); 1750 sc->sc_active.jj_offset = sc->sc_jstart; 1751 } 1752 1753 static void 1754 g_journal_mark_as_dirty(struct g_journal_softc *sc) 1755 { 1756 const struct g_journal_desc *desc; 1757 int i; 1758 1759 GJ_DEBUG(1, "Marking file system %s as dirty.", sc->sc_name); 1760 for (i = 0; (desc = g_journal_filesystems[i]) != NULL; i++) 1761 desc->jd_dirty(sc->sc_dconsumer); 1762 } 1763 1764 /* 1765 * Function read record header from the given journal. 1766 * It is very simlar to g_read_data(9), but it doesn't allocate memory for bio 1767 * and data on every call. 1768 */ 1769 static int 1770 g_journal_sync_read(struct g_consumer *cp, struct bio *bp, off_t offset, 1771 void *data) 1772 { 1773 int error; 1774 1775 g_reset_bio(bp); 1776 bp->bio_cmd = BIO_READ; 1777 bp->bio_done = NULL; 1778 bp->bio_offset = offset; 1779 bp->bio_length = cp->provider->sectorsize; 1780 bp->bio_data = data; 1781 g_io_request(bp, cp); 1782 error = biowait(bp, "gjs_read"); 1783 return (error); 1784 } 1785 1786 #if 0 1787 /* 1788 * Function is called when we start the journal device and we detect that 1789 * one of the journals was not fully copied. 1790 * The purpose of this function is to read all records headers from journal 1791 * and placed them in the inactive queue, so we can start journal 1792 * synchronization process and the journal provider itself. 1793 * Design decision was taken to not synchronize the whole journal here as it 1794 * can take too much time. Reading headers only and delaying synchronization 1795 * process until after journal provider is started should be the best choice. 1796 */ 1797 #endif 1798 1799 static void 1800 g_journal_sync(struct g_journal_softc *sc) 1801 { 1802 struct g_journal_record_header rhdr; 1803 struct g_journal_entry *ent; 1804 struct g_journal_header jhdr; 1805 struct g_consumer *cp; 1806 struct bio *bp, *fbp, *tbp; 1807 off_t joffset, offset; 1808 u_char *buf, sum[16]; 1809 uint64_t id; 1810 MD5_CTX ctx; 1811 int error, found, i; 1812 1813 found = 0; 1814 fbp = NULL; 1815 cp = sc->sc_jconsumer; 1816 bp = g_alloc_bio(); 1817 buf = gj_malloc(cp->provider->sectorsize, M_WAITOK); 1818 offset = joffset = sc->sc_inactive.jj_offset = sc->sc_journal_offset; 1819 1820 GJ_DEBUG(2, "Looking for termination at %jd.", (intmax_t)joffset); 1821 1822 /* 1823 * Read and decode first journal header. 1824 */ 1825 error = g_journal_sync_read(cp, bp, offset, buf); 1826 if (error != 0) { 1827 GJ_DEBUG(0, "Error while reading journal header from %s.", 1828 cp->provider->name); 1829 goto end; 1830 } 1831 error = g_journal_header_decode(buf, &jhdr); 1832 if (error != 0) { 1833 GJ_DEBUG(0, "Cannot decode journal header from %s.", 1834 cp->provider->name); 1835 goto end; 1836 } 1837 id = sc->sc_journal_id; 1838 if (jhdr.jh_journal_id != sc->sc_journal_id) { 1839 GJ_DEBUG(1, "Journal ID mismatch at %jd (0x%08x != 0x%08x).", 1840 (intmax_t)offset, (u_int)jhdr.jh_journal_id, (u_int)id); 1841 goto end; 1842 } 1843 offset += cp->provider->sectorsize; 1844 id = sc->sc_journal_next_id = jhdr.jh_journal_next_id; 1845 1846 for (;;) { 1847 /* 1848 * If the biggest record won't fit, look for a record header or 1849 * journal header from the beginning. 1850 */ 1851 GJ_VALIDATE_OFFSET(offset, sc); 1852 error = g_journal_sync_read(cp, bp, offset, buf); 1853 if (error != 0) { 1854 /* 1855 * Not good. Having an error while reading header 1856 * means, that we cannot read next headers and in 1857 * consequence we cannot find termination. 1858 */ 1859 GJ_DEBUG(0, 1860 "Error while reading record header from %s.", 1861 cp->provider->name); 1862 break; 1863 } 1864 1865 error = g_journal_record_header_decode(buf, &rhdr); 1866 if (error != 0) { 1867 GJ_DEBUG(2, "Not a record header at %jd (error=%d).", 1868 (intmax_t)offset, error); 1869 /* 1870 * This is not a record header. 1871 * If we are lucky, this is next journal header. 1872 */ 1873 error = g_journal_header_decode(buf, &jhdr); 1874 if (error != 0) { 1875 GJ_DEBUG(1, "Not a journal header at %jd (error=%d).", 1876 (intmax_t)offset, error); 1877 /* 1878 * Nope, this is not journal header, which 1879 * bascially means that journal is not 1880 * terminated properly. 1881 */ 1882 error = ENOENT; 1883 break; 1884 } 1885 /* 1886 * Ok. This is header of _some_ journal. Now we need to 1887 * verify if this is header of the _next_ journal. 1888 */ 1889 if (jhdr.jh_journal_id != id) { 1890 GJ_DEBUG(1, "Journal ID mismatch at %jd " 1891 "(0x%08x != 0x%08x).", (intmax_t)offset, 1892 (u_int)jhdr.jh_journal_id, (u_int)id); 1893 error = ENOENT; 1894 break; 1895 } 1896 1897 /* Found termination. */ 1898 found++; 1899 GJ_DEBUG(1, "Found termination at %jd (id=0x%08x).", 1900 (intmax_t)offset, (u_int)id); 1901 sc->sc_active.jj_offset = offset; 1902 sc->sc_journal_offset = 1903 offset + cp->provider->sectorsize; 1904 sc->sc_journal_id = id; 1905 id = sc->sc_journal_next_id = jhdr.jh_journal_next_id; 1906 1907 while ((tbp = fbp) != NULL) { 1908 fbp = tbp->bio_next; 1909 GJ_LOGREQ(3, tbp, "Adding request."); 1910 g_journal_insert_bio(&sc->sc_inactive.jj_queue, 1911 tbp, M_WAITOK); 1912 } 1913 1914 /* Skip journal's header. */ 1915 offset += cp->provider->sectorsize; 1916 continue; 1917 } 1918 1919 /* Skip record's header. */ 1920 offset += cp->provider->sectorsize; 1921 1922 /* 1923 * Add information about every record entry to the inactive 1924 * queue. 1925 */ 1926 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) 1927 MD5Init(&ctx); 1928 for (i = 0; i < rhdr.jrh_nentries; i++) { 1929 ent = &rhdr.jrh_entries[i]; 1930 GJ_DEBUG(3, "Insert entry: %jd %jd.", 1931 (intmax_t)ent->je_offset, (intmax_t)ent->je_length); 1932 g_journal_insert(&fbp, ent->je_offset, 1933 ent->je_offset + ent->je_length, ent->je_joffset, 1934 NULL, M_WAITOK); 1935 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) { 1936 u_char *buf2; 1937 1938 /* 1939 * TODO: Should use faster function (like 1940 * g_journal_sync_read()). 1941 */ 1942 buf2 = g_read_data(cp, offset, ent->je_length, 1943 NULL); 1944 if (buf2 == NULL) 1945 GJ_DEBUG(0, "Cannot read data at %jd.", 1946 (intmax_t)offset); 1947 else { 1948 MD5Update(&ctx, buf2, ent->je_length); 1949 g_free(buf2); 1950 } 1951 } 1952 /* Skip entry's data. */ 1953 offset += ent->je_length; 1954 } 1955 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) { 1956 MD5Final(sum, &ctx); 1957 if (bcmp(sum, rhdr.jrh_sum, sizeof(rhdr.jrh_sum)) != 0) { 1958 GJ_DEBUG(0, "MD5 hash mismatch at %jd!", 1959 (intmax_t)offset); 1960 } 1961 } 1962 } 1963 end: 1964 gj_free(bp->bio_data, cp->provider->sectorsize); 1965 g_destroy_bio(bp); 1966 1967 /* Remove bios from unterminated journal. */ 1968 while ((tbp = fbp) != NULL) { 1969 fbp = tbp->bio_next; 1970 g_destroy_bio(tbp); 1971 } 1972 1973 if (found < 1 && joffset > 0) { 1974 GJ_DEBUG(0, "Journal on %s is broken/corrupted. Initializing.", 1975 sc->sc_name); 1976 while ((tbp = sc->sc_inactive.jj_queue) != NULL) { 1977 sc->sc_inactive.jj_queue = tbp->bio_next; 1978 g_destroy_bio(tbp); 1979 } 1980 g_journal_initialize(sc); 1981 g_journal_mark_as_dirty(sc); 1982 } else { 1983 GJ_DEBUG(0, "Journal %s consistent.", sc->sc_name); 1984 g_journal_copy_start(sc); 1985 } 1986 } 1987 1988 /* 1989 * Wait for requests. 1990 * If we have requests in the current queue, flush them after 3 seconds from the 1991 * last flush. In this way we don't wait forever (or for journal switch) with 1992 * storing not full records on journal. 1993 */ 1994 static void 1995 g_journal_wait(struct g_journal_softc *sc, time_t last_write) 1996 { 1997 int error, timeout; 1998 1999 GJ_DEBUG(3, "%s: enter", __func__); 2000 if (sc->sc_current_count == 0) { 2001 if (g_journal_debug < 2) 2002 msleep(sc, &sc->sc_mtx, PRIBIO | PDROP, "gj:work", 0); 2003 else { 2004 /* 2005 * If we have debug turned on, show number of elements 2006 * in various queues. 2007 */ 2008 for (;;) { 2009 error = msleep(sc, &sc->sc_mtx, PRIBIO, 2010 "gj:work", hz * 3); 2011 if (error == 0) { 2012 mtx_unlock(&sc->sc_mtx); 2013 break; 2014 } 2015 GJ_DEBUG(3, "Report: current count=%d", 2016 sc->sc_current_count); 2017 GJ_DEBUG(3, "Report: flush count=%d", 2018 sc->sc_flush_count); 2019 GJ_DEBUG(3, "Report: flush in progress=%d", 2020 sc->sc_flush_in_progress); 2021 GJ_DEBUG(3, "Report: copy in progress=%d", 2022 sc->sc_copy_in_progress); 2023 GJ_DEBUG(3, "Report: delayed=%d", 2024 sc->sc_delayed_count); 2025 } 2026 } 2027 GJ_DEBUG(3, "%s: exit 1", __func__); 2028 return; 2029 } 2030 2031 /* 2032 * Flush even not full records every 3 seconds. 2033 */ 2034 timeout = (last_write + 3 - time_second) * hz; 2035 if (timeout <= 0) { 2036 mtx_unlock(&sc->sc_mtx); 2037 g_journal_flush(sc); 2038 g_journal_flush_send(sc); 2039 GJ_DEBUG(3, "%s: exit 2", __func__); 2040 return; 2041 } 2042 error = msleep(sc, &sc->sc_mtx, PRIBIO | PDROP, "gj:work", timeout); 2043 if (error == EWOULDBLOCK) 2044 g_journal_flush_send(sc); 2045 GJ_DEBUG(3, "%s: exit 3", __func__); 2046 } 2047 2048 /* 2049 * Worker thread. 2050 */ 2051 static void 2052 g_journal_worker(void *arg) 2053 { 2054 struct g_journal_softc *sc; 2055 struct g_geom *gp; 2056 struct g_provider *pp; 2057 struct bio *bp; 2058 time_t last_write; 2059 int type; 2060 2061 thread_lock(curthread); 2062 sched_prio(curthread, PRIBIO); 2063 thread_unlock(curthread); 2064 2065 sc = arg; 2066 type = 0; /* gcc */ 2067 2068 if (sc->sc_flags & GJF_DEVICE_CLEAN) { 2069 GJ_DEBUG(0, "Journal %s clean.", sc->sc_name); 2070 g_journal_initialize(sc); 2071 } else { 2072 g_journal_sync(sc); 2073 } 2074 /* 2075 * Check if we can use BIO_FLUSH. 2076 */ 2077 sc->sc_bio_flush = 0; 2078 if (g_io_flush(sc->sc_jconsumer) == 0) { 2079 sc->sc_bio_flush |= GJ_FLUSH_JOURNAL; 2080 GJ_DEBUG(1, "BIO_FLUSH supported by %s.", 2081 sc->sc_jconsumer->provider->name); 2082 } else { 2083 GJ_DEBUG(0, "BIO_FLUSH not supported by %s.", 2084 sc->sc_jconsumer->provider->name); 2085 } 2086 if (sc->sc_jconsumer != sc->sc_dconsumer) { 2087 if (g_io_flush(sc->sc_dconsumer) == 0) { 2088 sc->sc_bio_flush |= GJ_FLUSH_DATA; 2089 GJ_DEBUG(1, "BIO_FLUSH supported by %s.", 2090 sc->sc_dconsumer->provider->name); 2091 } else { 2092 GJ_DEBUG(0, "BIO_FLUSH not supported by %s.", 2093 sc->sc_dconsumer->provider->name); 2094 } 2095 } 2096 2097 gp = sc->sc_geom; 2098 g_topology_lock(); 2099 pp = g_new_providerf(gp, "%s.journal", sc->sc_name); 2100 pp->mediasize = sc->sc_mediasize; 2101 /* 2102 * There could be a problem when data provider and journal providers 2103 * have different sectorsize, but such scenario is prevented on journal 2104 * creation. 2105 */ 2106 pp->sectorsize = sc->sc_sectorsize; 2107 g_error_provider(pp, 0); 2108 g_topology_unlock(); 2109 last_write = time_second; 2110 2111 if (sc->sc_rootmount != NULL) { 2112 GJ_DEBUG(1, "root_mount_rel %p", sc->sc_rootmount); 2113 root_mount_rel(sc->sc_rootmount); 2114 sc->sc_rootmount = NULL; 2115 } 2116 2117 for (;;) { 2118 /* Get first request from the queue. */ 2119 mtx_lock(&sc->sc_mtx); 2120 bp = bioq_first(&sc->sc_back_queue); 2121 if (bp != NULL) 2122 type = (bp->bio_cflags & GJ_BIO_MASK); 2123 if (bp == NULL) { 2124 bp = bioq_first(&sc->sc_regular_queue); 2125 if (bp != NULL) 2126 type = GJ_BIO_REGULAR; 2127 } 2128 if (bp == NULL) { 2129 try_switch: 2130 if ((sc->sc_flags & GJF_DEVICE_SWITCH) || 2131 (sc->sc_flags & GJF_DEVICE_DESTROY)) { 2132 if (sc->sc_current_count > 0) { 2133 mtx_unlock(&sc->sc_mtx); 2134 g_journal_flush(sc); 2135 g_journal_flush_send(sc); 2136 continue; 2137 } 2138 if (sc->sc_flush_in_progress > 0) 2139 goto sleep; 2140 if (sc->sc_copy_in_progress > 0) 2141 goto sleep; 2142 } 2143 if (sc->sc_flags & GJF_DEVICE_SWITCH) { 2144 mtx_unlock(&sc->sc_mtx); 2145 g_journal_switch(sc); 2146 wakeup(&sc->sc_journal_copying); 2147 continue; 2148 } 2149 if (sc->sc_flags & GJF_DEVICE_DESTROY) { 2150 GJ_DEBUG(1, "Shutting down worker " 2151 "thread for %s.", gp->name); 2152 sc->sc_worker = NULL; 2153 wakeup(&sc->sc_worker); 2154 mtx_unlock(&sc->sc_mtx); 2155 kproc_exit(0); 2156 } 2157 sleep: 2158 g_journal_wait(sc, last_write); 2159 continue; 2160 } 2161 /* 2162 * If we're in switch process, we need to delay all new 2163 * write requests until its done. 2164 */ 2165 if ((sc->sc_flags & GJF_DEVICE_SWITCH) && 2166 type == GJ_BIO_REGULAR && bp->bio_cmd == BIO_WRITE) { 2167 GJ_LOGREQ(2, bp, "WRITE on SWITCH"); 2168 goto try_switch; 2169 } 2170 if (type == GJ_BIO_REGULAR) 2171 bioq_remove(&sc->sc_regular_queue, bp); 2172 else 2173 bioq_remove(&sc->sc_back_queue, bp); 2174 mtx_unlock(&sc->sc_mtx); 2175 switch (type) { 2176 case GJ_BIO_REGULAR: 2177 /* Regular request. */ 2178 switch (bp->bio_cmd) { 2179 case BIO_READ: 2180 g_journal_read(sc, bp, bp->bio_offset, 2181 bp->bio_offset + bp->bio_length); 2182 break; 2183 case BIO_WRITE: 2184 last_write = time_second; 2185 g_journal_add_request(sc, bp); 2186 g_journal_flush_send(sc); 2187 break; 2188 default: 2189 panic("Invalid bio_cmd (%d).", bp->bio_cmd); 2190 } 2191 break; 2192 case GJ_BIO_COPY: 2193 switch (bp->bio_cmd) { 2194 case BIO_READ: 2195 if (g_journal_copy_read_done(bp)) 2196 g_journal_copy_send(sc); 2197 break; 2198 case BIO_WRITE: 2199 g_journal_copy_write_done(bp); 2200 g_journal_copy_send(sc); 2201 break; 2202 default: 2203 panic("Invalid bio_cmd (%d).", bp->bio_cmd); 2204 } 2205 break; 2206 case GJ_BIO_JOURNAL: 2207 g_journal_flush_done(bp); 2208 g_journal_flush_send(sc); 2209 break; 2210 case GJ_BIO_READ: 2211 default: 2212 panic("Invalid bio (%d).", type); 2213 } 2214 } 2215 } 2216 2217 static void 2218 g_journal_destroy_event(void *arg, int flags __unused) 2219 { 2220 struct g_journal_softc *sc; 2221 2222 g_topology_assert(); 2223 sc = arg; 2224 g_journal_destroy(sc); 2225 } 2226 2227 static void 2228 g_journal_timeout(void *arg) 2229 { 2230 struct g_journal_softc *sc; 2231 2232 sc = arg; 2233 GJ_DEBUG(0, "Timeout. Journal %s cannot be completed.", 2234 sc->sc_geom->name); 2235 g_post_event(g_journal_destroy_event, sc, M_NOWAIT, NULL); 2236 } 2237 2238 static struct g_geom * 2239 g_journal_create(struct g_class *mp, struct g_provider *pp, 2240 const struct g_journal_metadata *md) 2241 { 2242 struct g_journal_softc *sc; 2243 struct g_geom *gp; 2244 struct g_consumer *cp; 2245 int error; 2246 2247 sc = NULL; /* gcc */ 2248 2249 g_topology_assert(); 2250 /* 2251 * There are two possibilities: 2252 * 1. Data and both journals are on the same provider. 2253 * 2. Data and journals are all on separated providers. 2254 */ 2255 /* Look for journal device with the same ID. */ 2256 LIST_FOREACH(gp, &mp->geom, geom) { 2257 sc = gp->softc; 2258 if (sc == NULL) 2259 continue; 2260 if (sc->sc_id == md->md_id) 2261 break; 2262 } 2263 if (gp == NULL) 2264 sc = NULL; 2265 else if (sc != NULL && (sc->sc_type & md->md_type) != 0) { 2266 GJ_DEBUG(1, "Journal device %u already configured.", sc->sc_id); 2267 return (NULL); 2268 } 2269 if (md->md_type == 0 || (md->md_type & ~GJ_TYPE_COMPLETE) != 0) { 2270 GJ_DEBUG(0, "Invalid type on %s.", pp->name); 2271 return (NULL); 2272 } 2273 if (md->md_type & GJ_TYPE_DATA) { 2274 GJ_DEBUG(0, "Journal %u: %s contains data.", md->md_id, 2275 pp->name); 2276 } 2277 if (md->md_type & GJ_TYPE_JOURNAL) { 2278 GJ_DEBUG(0, "Journal %u: %s contains journal.", md->md_id, 2279 pp->name); 2280 } 2281 2282 if (sc == NULL) { 2283 /* Action geom. */ 2284 sc = malloc(sizeof(*sc), M_JOURNAL, M_WAITOK | M_ZERO); 2285 sc->sc_id = md->md_id; 2286 sc->sc_type = 0; 2287 sc->sc_flags = 0; 2288 sc->sc_worker = NULL; 2289 2290 gp = g_new_geomf(mp, "gjournal %u", sc->sc_id); 2291 gp->start = g_journal_start; 2292 gp->orphan = g_journal_orphan; 2293 gp->access = g_journal_access; 2294 gp->softc = sc; 2295 gp->flags |= G_GEOM_VOLATILE_BIO; 2296 sc->sc_geom = gp; 2297 2298 mtx_init(&sc->sc_mtx, "gjournal", NULL, MTX_DEF); 2299 2300 bioq_init(&sc->sc_back_queue); 2301 bioq_init(&sc->sc_regular_queue); 2302 bioq_init(&sc->sc_delayed_queue); 2303 sc->sc_delayed_count = 0; 2304 sc->sc_current_queue = NULL; 2305 sc->sc_current_count = 0; 2306 sc->sc_flush_queue = NULL; 2307 sc->sc_flush_count = 0; 2308 sc->sc_flush_in_progress = 0; 2309 sc->sc_copy_queue = NULL; 2310 sc->sc_copy_in_progress = 0; 2311 sc->sc_inactive.jj_queue = NULL; 2312 sc->sc_active.jj_queue = NULL; 2313 2314 sc->sc_rootmount = root_mount_hold("GJOURNAL"); 2315 GJ_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 2316 2317 callout_init(&sc->sc_callout, 1); 2318 if (md->md_type != GJ_TYPE_COMPLETE) { 2319 /* 2320 * Journal and data are on separate providers. 2321 * At this point we have only one of them. 2322 * We setup a timeout in case the other part will not 2323 * appear, so we won't wait forever. 2324 */ 2325 callout_reset(&sc->sc_callout, 5 * hz, 2326 g_journal_timeout, sc); 2327 } 2328 } 2329 2330 /* Remember type of the data provider. */ 2331 if (md->md_type & GJ_TYPE_DATA) 2332 sc->sc_orig_type = md->md_type; 2333 sc->sc_type |= md->md_type; 2334 cp = NULL; 2335 2336 if (md->md_type & GJ_TYPE_DATA) { 2337 if (md->md_flags & GJ_FLAG_CLEAN) 2338 sc->sc_flags |= GJF_DEVICE_CLEAN; 2339 if (md->md_flags & GJ_FLAG_CHECKSUM) 2340 sc->sc_flags |= GJF_DEVICE_CHECKSUM; 2341 cp = g_new_consumer(gp); 2342 error = g_attach(cp, pp); 2343 KASSERT(error == 0, ("Cannot attach to %s (error=%d).", 2344 pp->name, error)); 2345 error = g_access(cp, 1, 1, 1); 2346 if (error != 0) { 2347 GJ_DEBUG(0, "Cannot access %s (error=%d).", pp->name, 2348 error); 2349 g_journal_destroy(sc); 2350 return (NULL); 2351 } 2352 sc->sc_dconsumer = cp; 2353 sc->sc_mediasize = pp->mediasize - pp->sectorsize; 2354 sc->sc_sectorsize = pp->sectorsize; 2355 sc->sc_jstart = md->md_jstart; 2356 sc->sc_jend = md->md_jend; 2357 if (md->md_provider[0] != '\0') 2358 sc->sc_flags |= GJF_DEVICE_HARDCODED; 2359 sc->sc_journal_offset = md->md_joffset; 2360 sc->sc_journal_id = md->md_jid; 2361 sc->sc_journal_previous_id = md->md_jid; 2362 } 2363 if (md->md_type & GJ_TYPE_JOURNAL) { 2364 if (cp == NULL) { 2365 cp = g_new_consumer(gp); 2366 error = g_attach(cp, pp); 2367 KASSERT(error == 0, ("Cannot attach to %s (error=%d).", 2368 pp->name, error)); 2369 error = g_access(cp, 1, 1, 1); 2370 if (error != 0) { 2371 GJ_DEBUG(0, "Cannot access %s (error=%d).", 2372 pp->name, error); 2373 g_journal_destroy(sc); 2374 return (NULL); 2375 } 2376 } else { 2377 /* 2378 * Journal is on the same provider as data, which means 2379 * that data provider ends where journal starts. 2380 */ 2381 sc->sc_mediasize = md->md_jstart; 2382 } 2383 sc->sc_jconsumer = cp; 2384 } 2385 2386 if ((sc->sc_type & GJ_TYPE_COMPLETE) != GJ_TYPE_COMPLETE) { 2387 /* Journal is not complete yet. */ 2388 return (gp); 2389 } else { 2390 /* Journal complete, cancel timeout. */ 2391 callout_drain(&sc->sc_callout); 2392 } 2393 2394 error = kproc_create(g_journal_worker, sc, &sc->sc_worker, 0, 0, 2395 "g_journal %s", sc->sc_name); 2396 if (error != 0) { 2397 GJ_DEBUG(0, "Cannot create worker thread for %s.journal.", 2398 sc->sc_name); 2399 g_journal_destroy(sc); 2400 return (NULL); 2401 } 2402 2403 return (gp); 2404 } 2405 2406 static void 2407 g_journal_destroy_consumer(void *arg, int flags __unused) 2408 { 2409 struct g_consumer *cp; 2410 2411 g_topology_assert(); 2412 cp = arg; 2413 g_detach(cp); 2414 g_destroy_consumer(cp); 2415 } 2416 2417 static int 2418 g_journal_destroy(struct g_journal_softc *sc) 2419 { 2420 struct g_geom *gp; 2421 struct g_provider *pp; 2422 struct g_consumer *cp; 2423 2424 g_topology_assert(); 2425 2426 if (sc == NULL) 2427 return (ENXIO); 2428 2429 gp = sc->sc_geom; 2430 pp = LIST_FIRST(&gp->provider); 2431 if (pp != NULL) { 2432 if (pp->acr != 0 || pp->acw != 0 || pp->ace != 0) { 2433 GJ_DEBUG(1, "Device %s is still open (r%dw%de%d).", 2434 pp->name, pp->acr, pp->acw, pp->ace); 2435 return (EBUSY); 2436 } 2437 g_error_provider(pp, ENXIO); 2438 2439 g_journal_flush(sc); 2440 g_journal_flush_send(sc); 2441 g_journal_switch(sc); 2442 } 2443 2444 sc->sc_flags |= (GJF_DEVICE_DESTROY | GJF_DEVICE_CLEAN); 2445 2446 g_topology_unlock(); 2447 2448 if (sc->sc_rootmount != NULL) { 2449 GJ_DEBUG(1, "root_mount_rel %p", sc->sc_rootmount); 2450 root_mount_rel(sc->sc_rootmount); 2451 sc->sc_rootmount = NULL; 2452 } 2453 2454 callout_drain(&sc->sc_callout); 2455 mtx_lock(&sc->sc_mtx); 2456 wakeup(sc); 2457 while (sc->sc_worker != NULL) 2458 msleep(&sc->sc_worker, &sc->sc_mtx, PRIBIO, "gj:destroy", 0); 2459 mtx_unlock(&sc->sc_mtx); 2460 2461 if (pp != NULL) { 2462 GJ_DEBUG(1, "Marking %s as clean.", sc->sc_name); 2463 g_journal_metadata_update(sc); 2464 g_topology_lock(); 2465 pp->flags |= G_PF_WITHER; 2466 g_orphan_provider(pp, ENXIO); 2467 } else { 2468 g_topology_lock(); 2469 } 2470 mtx_destroy(&sc->sc_mtx); 2471 2472 if (sc->sc_current_count != 0) { 2473 GJ_DEBUG(0, "Warning! Number of current requests %d.", 2474 sc->sc_current_count); 2475 } 2476 2477 LIST_FOREACH(cp, &gp->consumer, consumer) { 2478 if (cp->acr + cp->acw + cp->ace > 0) 2479 g_access(cp, -1, -1, -1); 2480 /* 2481 * We keep all consumers open for writting, so if I'll detach 2482 * and destroy consumer here, I'll get providers for taste, so 2483 * journal will be started again. 2484 * Sending an event here, prevents this from happening. 2485 */ 2486 g_post_event(g_journal_destroy_consumer, cp, M_WAITOK, NULL); 2487 } 2488 gp->softc = NULL; 2489 g_wither_geom(gp, ENXIO); 2490 free(sc, M_JOURNAL); 2491 return (0); 2492 } 2493 2494 static void 2495 g_journal_taste_orphan(struct g_consumer *cp) 2496 { 2497 2498 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 2499 cp->provider->name)); 2500 } 2501 2502 static struct g_geom * 2503 g_journal_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 2504 { 2505 struct g_journal_metadata md; 2506 struct g_consumer *cp; 2507 struct g_geom *gp; 2508 int error; 2509 2510 g_topology_assert(); 2511 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 2512 GJ_DEBUG(2, "Tasting %s.", pp->name); 2513 if (pp->geom->class == mp) 2514 return (NULL); 2515 2516 gp = g_new_geomf(mp, "journal:taste"); 2517 /* This orphan function should be never called. */ 2518 gp->orphan = g_journal_taste_orphan; 2519 cp = g_new_consumer(gp); 2520 g_attach(cp, pp); 2521 error = g_journal_metadata_read(cp, &md); 2522 g_detach(cp); 2523 g_destroy_consumer(cp); 2524 g_destroy_geom(gp); 2525 if (error != 0) 2526 return (NULL); 2527 gp = NULL; 2528 2529 if (md.md_provider[0] != '\0' && 2530 !g_compare_names(md.md_provider, pp->name)) 2531 return (NULL); 2532 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 2533 return (NULL); 2534 if (g_journal_debug >= 2) 2535 journal_metadata_dump(&md); 2536 2537 gp = g_journal_create(mp, pp, &md); 2538 return (gp); 2539 } 2540 2541 static struct g_journal_softc * 2542 g_journal_find_device(struct g_class *mp, const char *name) 2543 { 2544 struct g_journal_softc *sc; 2545 struct g_geom *gp; 2546 struct g_provider *pp; 2547 2548 if (strncmp(name, "/dev/", 5) == 0) 2549 name += 5; 2550 LIST_FOREACH(gp, &mp->geom, geom) { 2551 sc = gp->softc; 2552 if (sc == NULL) 2553 continue; 2554 if (sc->sc_flags & GJF_DEVICE_DESTROY) 2555 continue; 2556 if ((sc->sc_type & GJ_TYPE_COMPLETE) != GJ_TYPE_COMPLETE) 2557 continue; 2558 pp = LIST_FIRST(&gp->provider); 2559 if (strcmp(sc->sc_name, name) == 0) 2560 return (sc); 2561 if (pp != NULL && strcmp(pp->name, name) == 0) 2562 return (sc); 2563 } 2564 return (NULL); 2565 } 2566 2567 static void 2568 g_journal_ctl_destroy(struct gctl_req *req, struct g_class *mp) 2569 { 2570 struct g_journal_softc *sc; 2571 const char *name; 2572 char param[16]; 2573 int *nargs; 2574 int error, i; 2575 2576 g_topology_assert(); 2577 2578 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 2579 if (nargs == NULL) { 2580 gctl_error(req, "No '%s' argument.", "nargs"); 2581 return; 2582 } 2583 if (*nargs <= 0) { 2584 gctl_error(req, "Missing device(s)."); 2585 return; 2586 } 2587 2588 for (i = 0; i < *nargs; i++) { 2589 snprintf(param, sizeof(param), "arg%d", i); 2590 name = gctl_get_asciiparam(req, param); 2591 if (name == NULL) { 2592 gctl_error(req, "No 'arg%d' argument.", i); 2593 return; 2594 } 2595 sc = g_journal_find_device(mp, name); 2596 if (sc == NULL) { 2597 gctl_error(req, "No such device: %s.", name); 2598 return; 2599 } 2600 error = g_journal_destroy(sc); 2601 if (error != 0) { 2602 gctl_error(req, "Cannot destroy device %s (error=%d).", 2603 LIST_FIRST(&sc->sc_geom->provider)->name, error); 2604 return; 2605 } 2606 } 2607 } 2608 2609 static void 2610 g_journal_ctl_sync(struct gctl_req *req __unused, struct g_class *mp __unused) 2611 { 2612 2613 g_topology_assert(); 2614 g_topology_unlock(); 2615 g_journal_sync_requested++; 2616 wakeup(&g_journal_switcher_state); 2617 while (g_journal_sync_requested > 0) 2618 tsleep(&g_journal_sync_requested, PRIBIO, "j:sreq", hz / 2); 2619 g_topology_lock(); 2620 } 2621 2622 static void 2623 g_journal_config(struct gctl_req *req, struct g_class *mp, const char *verb) 2624 { 2625 uint32_t *version; 2626 2627 g_topology_assert(); 2628 2629 version = gctl_get_paraml(req, "version", sizeof(*version)); 2630 if (version == NULL) { 2631 gctl_error(req, "No '%s' argument.", "version"); 2632 return; 2633 } 2634 if (*version != G_JOURNAL_VERSION) { 2635 gctl_error(req, "Userland and kernel parts are out of sync."); 2636 return; 2637 } 2638 2639 if (strcmp(verb, "destroy") == 0 || strcmp(verb, "stop") == 0) { 2640 g_journal_ctl_destroy(req, mp); 2641 return; 2642 } else if (strcmp(verb, "sync") == 0) { 2643 g_journal_ctl_sync(req, mp); 2644 return; 2645 } 2646 2647 gctl_error(req, "Unknown verb."); 2648 } 2649 2650 static void 2651 g_journal_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2652 struct g_consumer *cp, struct g_provider *pp) 2653 { 2654 struct g_journal_softc *sc; 2655 2656 g_topology_assert(); 2657 2658 sc = gp->softc; 2659 if (sc == NULL) 2660 return; 2661 if (pp != NULL) { 2662 /* Nothing here. */ 2663 } else if (cp != NULL) { 2664 int first = 1; 2665 2666 sbuf_printf(sb, "%s<Role>", indent); 2667 if (cp == sc->sc_dconsumer) { 2668 sbuf_printf(sb, "Data"); 2669 first = 0; 2670 } 2671 if (cp == sc->sc_jconsumer) { 2672 if (!first) 2673 sbuf_printf(sb, ","); 2674 sbuf_printf(sb, "Journal"); 2675 } 2676 sbuf_printf(sb, "</Role>\n"); 2677 if (cp == sc->sc_jconsumer) { 2678 sbuf_printf(sb, "<Jstart>%jd</Jstart>\n", 2679 (intmax_t)sc->sc_jstart); 2680 sbuf_printf(sb, "<Jend>%jd</Jend>\n", 2681 (intmax_t)sc->sc_jend); 2682 } 2683 } else { 2684 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 2685 } 2686 } 2687 2688 static eventhandler_tag g_journal_event_shutdown = NULL; 2689 static eventhandler_tag g_journal_event_lowmem = NULL; 2690 2691 static void 2692 g_journal_shutdown(void *arg, int howto __unused) 2693 { 2694 struct g_class *mp; 2695 struct g_geom *gp, *gp2; 2696 2697 if (panicstr != NULL) 2698 return; 2699 mp = arg; 2700 g_topology_lock(); 2701 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 2702 if (gp->softc == NULL) 2703 continue; 2704 GJ_DEBUG(0, "Shutting down geom %s.", gp->name); 2705 g_journal_destroy(gp->softc); 2706 } 2707 g_topology_unlock(); 2708 } 2709 2710 /* 2711 * Free cached requests from inactive queue in case of low memory. 2712 * We free GJ_FREE_AT_ONCE elements at once. 2713 */ 2714 #define GJ_FREE_AT_ONCE 4 2715 static void 2716 g_journal_lowmem(void *arg, int howto __unused) 2717 { 2718 struct g_journal_softc *sc; 2719 struct g_class *mp; 2720 struct g_geom *gp; 2721 struct bio *bp; 2722 u_int nfree = GJ_FREE_AT_ONCE; 2723 2724 g_journal_stats_low_mem++; 2725 mp = arg; 2726 g_topology_lock(); 2727 LIST_FOREACH(gp, &mp->geom, geom) { 2728 sc = gp->softc; 2729 if (sc == NULL || (sc->sc_flags & GJF_DEVICE_DESTROY)) 2730 continue; 2731 mtx_lock(&sc->sc_mtx); 2732 for (bp = sc->sc_inactive.jj_queue; nfree > 0 && bp != NULL; 2733 nfree--, bp = bp->bio_next) { 2734 /* 2735 * This is safe to free the bio_data, because: 2736 * 1. If bio_data is NULL it will be read from the 2737 * inactive journal. 2738 * 2. If bp is sent down, it is first removed from the 2739 * inactive queue, so it's impossible to free the 2740 * data from under in-flight bio. 2741 * On the other hand, freeing elements from the active 2742 * queue, is not safe. 2743 */ 2744 if (bp->bio_data != NULL) { 2745 GJ_DEBUG(2, "Freeing data from %s.", 2746 sc->sc_name); 2747 gj_free(bp->bio_data, bp->bio_length); 2748 bp->bio_data = NULL; 2749 } 2750 } 2751 mtx_unlock(&sc->sc_mtx); 2752 if (nfree == 0) 2753 break; 2754 } 2755 g_topology_unlock(); 2756 } 2757 2758 static void g_journal_switcher(void *arg); 2759 2760 static void 2761 g_journal_init(struct g_class *mp) 2762 { 2763 int error; 2764 2765 /* Pick a conservative value if provided value sucks. */ 2766 if (g_journal_cache_divisor <= 0 || 2767 (vm_kmem_size / g_journal_cache_divisor == 0)) { 2768 g_journal_cache_divisor = 5; 2769 } 2770 if (g_journal_cache_limit > 0) { 2771 g_journal_cache_limit = vm_kmem_size / g_journal_cache_divisor; 2772 g_journal_cache_low = 2773 (g_journal_cache_limit / 100) * g_journal_cache_switch; 2774 } 2775 g_journal_event_shutdown = EVENTHANDLER_REGISTER(shutdown_post_sync, 2776 g_journal_shutdown, mp, EVENTHANDLER_PRI_FIRST); 2777 if (g_journal_event_shutdown == NULL) 2778 GJ_DEBUG(0, "Warning! Cannot register shutdown event."); 2779 g_journal_event_lowmem = EVENTHANDLER_REGISTER(vm_lowmem, 2780 g_journal_lowmem, mp, EVENTHANDLER_PRI_FIRST); 2781 if (g_journal_event_lowmem == NULL) 2782 GJ_DEBUG(0, "Warning! Cannot register lowmem event."); 2783 error = kproc_create(g_journal_switcher, mp, NULL, 0, 0, 2784 "g_journal switcher"); 2785 KASSERT(error == 0, ("Cannot create switcher thread.")); 2786 } 2787 2788 static void 2789 g_journal_fini(struct g_class *mp) 2790 { 2791 2792 if (g_journal_event_shutdown != NULL) { 2793 EVENTHANDLER_DEREGISTER(shutdown_post_sync, 2794 g_journal_event_shutdown); 2795 } 2796 if (g_journal_event_lowmem != NULL) 2797 EVENTHANDLER_DEREGISTER(vm_lowmem, g_journal_event_lowmem); 2798 g_journal_switcher_state = GJ_SWITCHER_DIE; 2799 wakeup(&g_journal_switcher_state); 2800 while (g_journal_switcher_state != GJ_SWITCHER_DIED) 2801 tsleep(&g_journal_switcher_state, PRIBIO, "jfini:wait", hz / 5); 2802 GJ_DEBUG(1, "Switcher died."); 2803 } 2804 2805 DECLARE_GEOM_CLASS(g_journal_class, g_journal); 2806 2807 static const struct g_journal_desc * 2808 g_journal_find_desc(const char *fstype) 2809 { 2810 const struct g_journal_desc *desc; 2811 int i; 2812 2813 for (desc = g_journal_filesystems[i = 0]; desc != NULL; 2814 desc = g_journal_filesystems[++i]) { 2815 if (strcmp(desc->jd_fstype, fstype) == 0) 2816 break; 2817 } 2818 return (desc); 2819 } 2820 2821 static void 2822 g_journal_switch_wait(struct g_journal_softc *sc) 2823 { 2824 struct bintime bt; 2825 2826 mtx_assert(&sc->sc_mtx, MA_OWNED); 2827 if (g_journal_debug >= 2) { 2828 if (sc->sc_flush_in_progress > 0) { 2829 GJ_DEBUG(2, "%d requests flushing.", 2830 sc->sc_flush_in_progress); 2831 } 2832 if (sc->sc_copy_in_progress > 0) { 2833 GJ_DEBUG(2, "%d requests copying.", 2834 sc->sc_copy_in_progress); 2835 } 2836 if (sc->sc_flush_count > 0) { 2837 GJ_DEBUG(2, "%d requests to flush.", 2838 sc->sc_flush_count); 2839 } 2840 if (sc->sc_delayed_count > 0) { 2841 GJ_DEBUG(2, "%d requests delayed.", 2842 sc->sc_delayed_count); 2843 } 2844 } 2845 g_journal_stats_switches++; 2846 if (sc->sc_copy_in_progress > 0) 2847 g_journal_stats_wait_for_copy++; 2848 GJ_TIMER_START(1, &bt); 2849 sc->sc_flags &= ~GJF_DEVICE_BEFORE_SWITCH; 2850 sc->sc_flags |= GJF_DEVICE_SWITCH; 2851 wakeup(sc); 2852 while (sc->sc_flags & GJF_DEVICE_SWITCH) { 2853 msleep(&sc->sc_journal_copying, &sc->sc_mtx, PRIBIO, 2854 "gj:switch", 0); 2855 } 2856 GJ_TIMER_STOP(1, &bt, "Switch time of %s", sc->sc_name); 2857 } 2858 2859 static void 2860 g_journal_do_switch(struct g_class *classp) 2861 { 2862 struct g_journal_softc *sc; 2863 const struct g_journal_desc *desc; 2864 struct g_geom *gp; 2865 struct mount *mp; 2866 struct bintime bt; 2867 char *mountpoint; 2868 int error, save; 2869 2870 g_topology_lock(); 2871 LIST_FOREACH(gp, &classp->geom, geom) { 2872 sc = gp->softc; 2873 if (sc == NULL) 2874 continue; 2875 if (sc->sc_flags & GJF_DEVICE_DESTROY) 2876 continue; 2877 if ((sc->sc_type & GJ_TYPE_COMPLETE) != GJ_TYPE_COMPLETE) 2878 continue; 2879 mtx_lock(&sc->sc_mtx); 2880 sc->sc_flags |= GJF_DEVICE_BEFORE_SWITCH; 2881 mtx_unlock(&sc->sc_mtx); 2882 } 2883 g_topology_unlock(); 2884 2885 mtx_lock(&mountlist_mtx); 2886 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 2887 if (mp->mnt_gjprovider == NULL) 2888 continue; 2889 if (mp->mnt_flag & MNT_RDONLY) 2890 continue; 2891 desc = g_journal_find_desc(mp->mnt_stat.f_fstypename); 2892 if (desc == NULL) 2893 continue; 2894 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) 2895 continue; 2896 /* mtx_unlock(&mountlist_mtx) was done inside vfs_busy() */ 2897 2898 g_topology_lock(); 2899 sc = g_journal_find_device(classp, mp->mnt_gjprovider); 2900 g_topology_unlock(); 2901 2902 if (sc == NULL) { 2903 GJ_DEBUG(0, "Cannot find journal geom for %s.", 2904 mp->mnt_gjprovider); 2905 goto next; 2906 } else if (JEMPTY(sc)) { 2907 mtx_lock(&sc->sc_mtx); 2908 sc->sc_flags &= ~GJF_DEVICE_BEFORE_SWITCH; 2909 mtx_unlock(&sc->sc_mtx); 2910 GJ_DEBUG(3, "No need for %s switch.", sc->sc_name); 2911 goto next; 2912 } 2913 2914 mountpoint = mp->mnt_stat.f_mntonname; 2915 2916 error = vn_start_write(NULL, &mp, V_WAIT); 2917 if (error != 0) { 2918 GJ_DEBUG(0, "vn_start_write(%s) failed (error=%d).", 2919 mountpoint, error); 2920 goto next; 2921 } 2922 2923 save = curthread_pflags_set(TDP_SYNCIO); 2924 2925 GJ_TIMER_START(1, &bt); 2926 vfs_msync(mp, MNT_NOWAIT); 2927 GJ_TIMER_STOP(1, &bt, "Msync time of %s", mountpoint); 2928 2929 GJ_TIMER_START(1, &bt); 2930 error = VFS_SYNC(mp, MNT_NOWAIT); 2931 if (error == 0) 2932 GJ_TIMER_STOP(1, &bt, "Sync time of %s", mountpoint); 2933 else { 2934 GJ_DEBUG(0, "Cannot sync file system %s (error=%d).", 2935 mountpoint, error); 2936 } 2937 2938 curthread_pflags_restore(save); 2939 2940 vn_finished_write(mp); 2941 2942 if (error != 0) 2943 goto next; 2944 2945 /* 2946 * Send BIO_FLUSH before freezing the file system, so it can be 2947 * faster after the freeze. 2948 */ 2949 GJ_TIMER_START(1, &bt); 2950 g_journal_flush_cache(sc); 2951 GJ_TIMER_STOP(1, &bt, "BIO_FLUSH time of %s", sc->sc_name); 2952 2953 GJ_TIMER_START(1, &bt); 2954 error = vfs_write_suspend(mp, VS_SKIP_UNMOUNT); 2955 GJ_TIMER_STOP(1, &bt, "Suspend time of %s", mountpoint); 2956 if (error != 0) { 2957 GJ_DEBUG(0, "Cannot suspend file system %s (error=%d).", 2958 mountpoint, error); 2959 goto next; 2960 } 2961 2962 error = desc->jd_clean(mp); 2963 if (error != 0) 2964 goto next; 2965 2966 mtx_lock(&sc->sc_mtx); 2967 g_journal_switch_wait(sc); 2968 mtx_unlock(&sc->sc_mtx); 2969 2970 vfs_write_resume(mp, 0); 2971 next: 2972 mtx_lock(&mountlist_mtx); 2973 vfs_unbusy(mp); 2974 } 2975 mtx_unlock(&mountlist_mtx); 2976 2977 sc = NULL; 2978 for (;;) { 2979 g_topology_lock(); 2980 LIST_FOREACH(gp, &g_journal_class.geom, geom) { 2981 sc = gp->softc; 2982 if (sc == NULL) 2983 continue; 2984 mtx_lock(&sc->sc_mtx); 2985 if ((sc->sc_type & GJ_TYPE_COMPLETE) == GJ_TYPE_COMPLETE && 2986 !(sc->sc_flags & GJF_DEVICE_DESTROY) && 2987 (sc->sc_flags & GJF_DEVICE_BEFORE_SWITCH)) { 2988 break; 2989 } 2990 mtx_unlock(&sc->sc_mtx); 2991 sc = NULL; 2992 } 2993 g_topology_unlock(); 2994 if (sc == NULL) 2995 break; 2996 mtx_assert(&sc->sc_mtx, MA_OWNED); 2997 g_journal_switch_wait(sc); 2998 mtx_unlock(&sc->sc_mtx); 2999 } 3000 } 3001 3002 /* 3003 * TODO: Switcher thread should be started on first geom creation and killed on 3004 * last geom destruction. 3005 */ 3006 static void 3007 g_journal_switcher(void *arg) 3008 { 3009 struct g_class *mp; 3010 struct bintime bt; 3011 int error; 3012 3013 mp = arg; 3014 curthread->td_pflags |= TDP_NORUNNINGBUF; 3015 for (;;) { 3016 g_journal_switcher_wokenup = 0; 3017 error = tsleep(&g_journal_switcher_state, PRIBIO, "jsw:wait", 3018 g_journal_switch_time * hz); 3019 if (g_journal_switcher_state == GJ_SWITCHER_DIE) { 3020 g_journal_switcher_state = GJ_SWITCHER_DIED; 3021 GJ_DEBUG(1, "Switcher exiting."); 3022 wakeup(&g_journal_switcher_state); 3023 kproc_exit(0); 3024 } 3025 if (error == 0 && g_journal_sync_requested == 0) { 3026 GJ_DEBUG(1, "Out of cache, force switch (used=%u " 3027 "limit=%u).", g_journal_cache_used, 3028 g_journal_cache_limit); 3029 } 3030 GJ_TIMER_START(1, &bt); 3031 g_journal_do_switch(mp); 3032 GJ_TIMER_STOP(1, &bt, "Entire switch time"); 3033 if (g_journal_sync_requested > 0) { 3034 g_journal_sync_requested = 0; 3035 wakeup(&g_journal_sync_requested); 3036 } 3037 } 3038 }
Cache object: 12e035eb6d5227f3ae82c49baa5cffb1
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