1 /* $NetBSD: udf_strat_rmw.c,v 1.24 2013/10/30 08:41:38 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 2006, 2008 Reinoud Zandijk 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 ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 */ 28 29 #include <sys/cdefs.h> 30 #ifndef lint 31 __KERNEL_RCSID(0, "$NetBSD: udf_strat_rmw.c,v 1.24 2013/10/30 08:41:38 mrg Exp $"); 32 #endif /* not lint */ 33 34 35 #if defined(_KERNEL_OPT) 36 #include "opt_compat_netbsd.h" 37 #endif 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/sysctl.h> 42 #include <sys/namei.h> 43 #include <sys/proc.h> 44 #include <sys/kernel.h> 45 #include <sys/vnode.h> 46 #include <miscfs/genfs/genfs_node.h> 47 #include <sys/mount.h> 48 #include <sys/buf.h> 49 #include <sys/file.h> 50 #include <sys/device.h> 51 #include <sys/disklabel.h> 52 #include <sys/ioctl.h> 53 #include <sys/malloc.h> 54 #include <sys/dirent.h> 55 #include <sys/stat.h> 56 #include <sys/conf.h> 57 #include <sys/kauth.h> 58 #include <sys/kthread.h> 59 #include <dev/clock_subr.h> 60 61 #include <fs/udf/ecma167-udf.h> 62 #include <fs/udf/udf_mount.h> 63 64 #include "udf.h" 65 #include "udf_subr.h" 66 #include "udf_bswap.h" 67 68 69 #define VTOI(vnode) ((struct udf_node *) (vnode)->v_data) 70 #define PRIV(ump) ((struct strat_private *) (ump)->strategy_private) 71 #define BTOE(buf) ((struct udf_eccline *) ((buf)->b_private)) 72 73 /* --------------------------------------------------------------------- */ 74 75 #define UDF_MAX_PACKET_SIZE 64 /* DONT change this */ 76 77 /* sheduler states */ 78 #define UDF_SHED_WAITING 1 /* waiting on timeout */ 79 #define UDF_SHED_READING 2 80 #define UDF_SHED_WRITING 3 81 #define UDF_SHED_SEQWRITING 4 82 #define UDF_SHED_IDLE 5 /* refcnt'd */ 83 #define UDF_SHED_FREE 6 /* recycleable */ 84 #define UDF_SHED_MAX 6+1 85 86 /* flags */ 87 #define ECC_LOCKED 0x01 /* prevent access */ 88 #define ECC_WANTED 0x02 /* trying access */ 89 #define ECC_SEQWRITING 0x04 /* sequential queue */ 90 #define ECC_FLOATING 0x08 /* not queued yet */ 91 92 #define ECC_WAITTIME 10 93 94 95 TAILQ_HEAD(ecclineq, udf_eccline); 96 struct udf_eccline { 97 struct udf_mount *ump; 98 uint64_t present; /* preserve these */ 99 uint64_t readin; /* bitmap */ 100 uint64_t dirty; /* bitmap */ 101 uint64_t error; /* bitmap */ 102 uint32_t refcnt; 103 104 struct timespec wait_time; 105 uint32_t flags; 106 uint32_t start_sector; /* physical */ 107 108 const char *fname; 109 int sline; 110 111 struct buf *buf; 112 void *blob; 113 114 struct buf *bufs[UDF_MAX_PACKET_SIZE]; 115 uint32_t bufs_bpos[UDF_MAX_PACKET_SIZE]; 116 int bufs_len[UDF_MAX_PACKET_SIZE]; 117 118 int queued_on; /* on which BUFQ list */ 119 LIST_ENTRY(udf_eccline) hashchain; /* on sector lookup */ 120 }; 121 122 123 struct strat_private { 124 lwp_t *queue_lwp; 125 kcondvar_t discstrat_cv; /* to wait on */ 126 kmutex_t discstrat_mutex; /* disc strategy */ 127 kmutex_t seqwrite_mutex; /* protect mappings */ 128 129 int thread_running; /* thread control */ 130 int run_thread; /* thread control */ 131 int thread_finished; /* thread control */ 132 int cur_queue; 133 134 int num_floating; 135 int num_queued[UDF_SHED_MAX]; 136 struct bufq_state *queues[UDF_SHED_MAX]; 137 struct timespec last_queued[UDF_SHED_MAX]; 138 struct disk_strategy old_strategy_setting; 139 140 struct pool eccline_pool; 141 struct pool ecclineblob_pool; 142 LIST_HEAD(, udf_eccline) eccline_hash[UDF_ECCBUF_HASHSIZE]; 143 }; 144 145 /* --------------------------------------------------------------------- */ 146 147 #define UDF_LOCK_ECCLINE(eccline) udf_lock_eccline(eccline, __FILE__, __LINE__) 148 #define UDF_UNLOCK_ECCLINE(eccline) udf_unlock_eccline(eccline, __FILE__, __LINE__) 149 150 /* can be called with or without discstrat lock */ 151 static void 152 udf_lock_eccline(struct udf_eccline *eccline, const char *fname, int sline) 153 { 154 struct strat_private *priv = PRIV(eccline->ump); 155 int waslocked, ret; 156 157 KASSERT(mutex_owned(&priv->discstrat_mutex)); 158 159 waslocked = mutex_owned(&priv->discstrat_mutex); 160 if (!waslocked) 161 mutex_enter(&priv->discstrat_mutex); 162 163 /* wait until its unlocked first */ 164 eccline->refcnt++; 165 while (eccline->flags & ECC_LOCKED) { 166 DPRINTF(ECCLINE, ("waiting for lock at %s:%d\n", 167 fname, sline)); 168 DPRINTF(ECCLINE, ("was locked at %s:%d\n", 169 eccline->fname, eccline->sline)); 170 eccline->flags |= ECC_WANTED; 171 ret = cv_timedwait(&priv->discstrat_cv, &priv->discstrat_mutex, 172 hz/8); 173 if (ret == EWOULDBLOCK) 174 DPRINTF(LOCKING, ("eccline lock helt, waiting for " 175 "release")); 176 } 177 eccline->flags |= ECC_LOCKED; 178 eccline->flags &= ~ECC_WANTED; 179 eccline->refcnt--; 180 181 eccline->fname = fname; 182 eccline->sline = sline; 183 184 if (!waslocked) 185 mutex_exit(&priv->discstrat_mutex); 186 } 187 188 189 /* can be called with or without discstrat lock */ 190 static void 191 udf_unlock_eccline(struct udf_eccline *eccline, const char *fname, int sline) 192 { 193 struct strat_private *priv = PRIV(eccline->ump); 194 int waslocked; 195 196 KASSERT(mutex_owned(&priv->discstrat_mutex)); 197 198 waslocked = mutex_owned(&priv->discstrat_mutex); 199 if (!waslocked) 200 mutex_enter(&priv->discstrat_mutex); 201 202 eccline->flags &= ~ECC_LOCKED; 203 cv_broadcast(&priv->discstrat_cv); 204 205 if (!waslocked) 206 mutex_exit(&priv->discstrat_mutex); 207 } 208 209 210 /* NOTE discstrat_mutex should be held! */ 211 static void 212 udf_dispose_eccline(struct udf_eccline *eccline) 213 { 214 struct strat_private *priv = PRIV(eccline->ump); 215 216 KASSERT(mutex_owned(&priv->discstrat_mutex)); 217 218 DPRINTF(ECCLINE, ("dispose eccline with start sector %d, " 219 "present %0"PRIx64"\n", eccline->start_sector, 220 eccline->present)); 221 222 KASSERT(eccline->refcnt == 0); 223 KASSERT(eccline->dirty == 0); 224 KASSERT(eccline->queued_on == 0); 225 KASSERT(eccline->flags & ECC_FLOATING); 226 KASSERT(eccline->flags & ECC_LOCKED); 227 228 LIST_REMOVE(eccline, hashchain); 229 priv->num_floating--; 230 231 putiobuf(eccline->buf); 232 pool_put(&priv->ecclineblob_pool, eccline->blob); 233 pool_put(&priv->eccline_pool, eccline); 234 } 235 236 237 /* NOTE discstrat_mutex should be held! */ 238 static void 239 udf_push_eccline(struct udf_eccline *eccline, int newqueue) 240 { 241 struct strat_private *priv = PRIV(eccline->ump); 242 243 KASSERT(mutex_owned(&priv->discstrat_mutex)); 244 245 DPRINTF(PARANOIA, ("DEBUG: buf %p pushed on queue %d\n", eccline->buf, newqueue)); 246 247 KASSERT(eccline->queued_on == 0); 248 KASSERT(eccline->flags & ECC_FLOATING); 249 250 /* set buffer block numbers to make sure its queued correctly */ 251 eccline->buf->b_lblkno = eccline->start_sector; 252 eccline->buf->b_blkno = eccline->start_sector; 253 eccline->buf->b_rawblkno = eccline->start_sector; 254 255 vfs_timestamp(&priv->last_queued[newqueue]); 256 eccline->flags &= ~ECC_FLOATING; 257 priv->num_floating--; 258 eccline->queued_on = newqueue; 259 priv->num_queued[newqueue]++; 260 bufq_put(priv->queues[newqueue], eccline->buf); 261 262 UDF_UNLOCK_ECCLINE(eccline); 263 264 /* XXX tickle disc strategy statemachine */ 265 if (newqueue != UDF_SHED_IDLE) 266 cv_signal(&priv->discstrat_cv); 267 } 268 269 270 static struct udf_eccline * 271 udf_peek_eccline(struct strat_private *priv, int queued_on) 272 { 273 struct udf_eccline *eccline; 274 struct buf *buf; 275 276 KASSERT(mutex_owned(&priv->discstrat_mutex)); 277 278 for(;;) { 279 buf = bufq_peek(priv->queues[queued_on]); 280 /* could have been a race, but we'll revisit later */ 281 if (buf == NULL) 282 return NULL; 283 284 eccline = BTOE(buf); 285 UDF_LOCK_ECCLINE(eccline); 286 287 /* might have changed before we obtained the lock */ 288 if (eccline->queued_on == queued_on) 289 break; 290 291 UDF_UNLOCK_ECCLINE(eccline); 292 } 293 294 KASSERT(eccline->queued_on == queued_on); 295 KASSERT((eccline->flags & ECC_FLOATING) == 0); 296 297 DPRINTF(PARANOIA, ("DEBUG: buf %p peeked at queue %d\n", 298 eccline->buf, queued_on)); 299 300 return eccline; 301 } 302 303 304 static struct udf_eccline * 305 udf_pop_eccline(struct strat_private *priv, int queued_on) 306 { 307 struct udf_eccline *eccline; 308 struct buf *buf; 309 310 KASSERT(mutex_owned(&priv->discstrat_mutex)); 311 312 for(;;) { 313 buf = bufq_get(priv->queues[queued_on]); 314 if (buf == NULL) { 315 // KASSERT(priv->num_queued[queued_on] == 0); 316 return NULL; 317 } 318 319 eccline = BTOE(buf); 320 UDF_LOCK_ECCLINE(eccline); 321 322 /* might have changed before we obtained the lock */ 323 if (eccline->queued_on == queued_on) 324 break; 325 326 UDF_UNLOCK_ECCLINE(eccline); 327 } 328 329 KASSERT(eccline->queued_on == queued_on); 330 KASSERT((eccline->flags & ECC_FLOATING) == 0); 331 332 priv->num_queued[queued_on]--; 333 eccline->queued_on = 0; 334 335 eccline->flags |= ECC_FLOATING; 336 priv->num_floating++; 337 338 DPRINTF(PARANOIA, ("DEBUG: buf %p popped from queue %d\n", 339 eccline->buf, queued_on)); 340 341 return eccline; 342 } 343 344 345 static void 346 udf_unqueue_eccline(struct strat_private *priv, struct udf_eccline *eccline) 347 { 348 struct buf *ret __diagused; 349 350 UDF_LOCK_ECCLINE(eccline); 351 if (eccline->queued_on == 0) { 352 KASSERT(eccline->flags & ECC_FLOATING); 353 return; 354 } 355 356 ret = bufq_cancel(priv->queues[eccline->queued_on], eccline->buf); 357 KASSERT(ret == eccline->buf); 358 359 priv->num_queued[eccline->queued_on]--; 360 eccline->queued_on = 0; 361 362 eccline->flags |= ECC_FLOATING; 363 priv->num_floating++; 364 } 365 366 367 static struct udf_eccline * 368 udf_geteccline(struct udf_mount *ump, uint32_t sector, int flags) 369 { 370 struct strat_private *priv = PRIV(ump); 371 struct udf_eccline *eccline; 372 uint32_t start_sector, lb_size, blobsize; 373 uint8_t *eccline_blob; 374 int line, line_offset; 375 int num_busy; 376 377 mutex_enter(&priv->discstrat_mutex); 378 379 /* lookup in our line cache hashtable */ 380 line_offset = sector % ump->packet_size; 381 start_sector = sector - line_offset; 382 line = (start_sector/ump->packet_size) & UDF_ECCBUF_HASHMASK; 383 384 KASSERT(priv->thread_running); 385 386 retry: 387 DPRINTF(ECCLINE, ("get line sector %d, line %d\n", sector, line)); 388 LIST_FOREACH(eccline, &priv->eccline_hash[line], hashchain) { 389 if (eccline->start_sector == start_sector) { 390 DPRINTF(ECCLINE, ("\tfound eccline, start_sector %d\n", 391 eccline->start_sector)); 392 udf_unqueue_eccline(priv, eccline); 393 394 mutex_exit(&priv->discstrat_mutex); 395 return eccline; 396 } 397 } 398 399 /* not found in eccline cache */ 400 DPRINTF(ECCLINE, ("\tnot found in eccline cache\n")); 401 402 lb_size = udf_rw32(ump->logical_vol->lb_size); 403 blobsize = ump->packet_size * lb_size; 404 405 /* dont allow too many pending requests */ 406 DPRINTF(ECCLINE, ("\tallocating new eccline\n")); 407 num_busy = (priv->num_queued[UDF_SHED_SEQWRITING] + priv->num_floating); 408 if ((flags & ECC_SEQWRITING) && (num_busy > UDF_ECCLINE_MAXBUSY)) { 409 cv_timedwait(&priv->discstrat_cv, 410 &priv->discstrat_mutex, hz/8); 411 goto retry; 412 } 413 414 eccline_blob = pool_get(&priv->ecclineblob_pool, PR_NOWAIT); 415 eccline = pool_get(&priv->eccline_pool, PR_NOWAIT); 416 if ((eccline_blob == NULL) || (eccline == NULL)) { 417 if (eccline_blob) 418 pool_put(&priv->ecclineblob_pool, eccline_blob); 419 if (eccline) 420 pool_put(&priv->eccline_pool, eccline); 421 422 /* out of memory for now; canibalise freelist */ 423 eccline = udf_pop_eccline(priv, UDF_SHED_FREE); 424 if (eccline == NULL) { 425 /* serious trouble; wait and retry */ 426 cv_timedwait(&priv->discstrat_cv, 427 &priv->discstrat_mutex, hz/8); 428 goto retry; 429 } 430 431 /* push back line if we're waiting for it or its locked */ 432 if (eccline->flags & ECC_WANTED) { 433 /* we won a race, but someone else needed it */ 434 udf_push_eccline(eccline, UDF_SHED_FREE); 435 goto retry; 436 } 437 438 /* unlink this entry */ 439 LIST_REMOVE(eccline, hashchain); 440 KASSERT(eccline->flags & ECC_FLOATING); 441 KASSERT(eccline->queued_on == 0); 442 443 eccline_blob = eccline->blob; 444 eccline->flags = ECC_FLOATING | ECC_LOCKED; 445 } else { 446 eccline->flags = ECC_FLOATING | ECC_LOCKED; 447 priv->num_floating++; 448 } 449 450 eccline->queued_on = 0; 451 eccline->blob = eccline_blob; 452 eccline->buf = getiobuf(NULL, true); 453 eccline->buf->b_private = eccline; /* IMPORTANT */ 454 455 /* initialise eccline blob */ 456 /* XXX memset expensive and strictly not needed XXX */ 457 memset(eccline->blob, 0, blobsize); 458 459 eccline->ump = ump; 460 eccline->present = eccline->readin = eccline->dirty = 0; 461 eccline->error = 0; 462 eccline->refcnt = 0; 463 memset(eccline->bufs, 0, UDF_MAX_PACKET_SIZE * sizeof(struct buf *)); 464 465 eccline->start_sector = start_sector; 466 eccline->buf->b_lblkno = start_sector; 467 eccline->buf->b_blkno = start_sector; 468 eccline->buf->b_rawblkno = start_sector; 469 470 LIST_INSERT_HEAD(&priv->eccline_hash[line], eccline, hashchain); 471 472 /* 473 * TODO possible optimalisation for checking overlap with partitions 474 * to get a clue on future eccline usage 475 */ 476 477 KASSERT(eccline->refcnt == 0); 478 KASSERT(eccline->flags & ECC_FLOATING); 479 KASSERT(eccline->flags & ECC_LOCKED); 480 mutex_exit(&priv->discstrat_mutex); 481 482 return eccline; 483 } 484 485 486 static void 487 udf_puteccline(struct udf_eccline *eccline) 488 { 489 struct strat_private *priv = PRIV(eccline->ump); 490 struct udf_mount *ump = eccline->ump; 491 uint64_t allbits = ((uint64_t) 1 << ump->packet_size)-1; 492 int new_queue; 493 494 mutex_enter(&priv->discstrat_mutex); 495 496 DPRINTF(ECCLINE, ("put eccline start sector %d, refcnt %d\n", 497 eccline->start_sector, eccline->refcnt)); 498 499 KASSERT(eccline->flags & ECC_LOCKED); 500 KASSERT(eccline->flags & ECC_FLOATING); 501 502 /* clear all read bits that are already read in */ 503 if (eccline->readin & eccline->present) 504 eccline->readin &= (~eccline->present) & allbits; 505 506 /* if we have active nodes we dont set it on seqwriting */ 507 if (eccline->refcnt > 1) 508 eccline->flags &= ~ECC_SEQWRITING; 509 510 /* select state */ 511 new_queue = UDF_SHED_FREE; 512 if (eccline->refcnt > 0) 513 new_queue = UDF_SHED_IDLE; 514 if (eccline->flags & ECC_WANTED) 515 new_queue = UDF_SHED_IDLE; 516 if (eccline->readin) 517 new_queue = UDF_SHED_READING; 518 if (eccline->dirty) { 519 new_queue = UDF_SHED_WAITING; 520 vfs_timestamp(&eccline->wait_time); 521 eccline->wait_time.tv_sec += ECC_WAITTIME; 522 523 if (eccline->present == allbits) { 524 new_queue = UDF_SHED_WRITING; 525 if (eccline->flags & ECC_SEQWRITING) 526 new_queue = UDF_SHED_SEQWRITING; 527 } 528 } 529 udf_push_eccline(eccline, new_queue); 530 531 mutex_exit(&priv->discstrat_mutex); 532 } 533 534 /* --------------------------------------------------------------------- */ 535 536 static int 537 udf_create_nodedscr_rmw(struct udf_strat_args *args) 538 { 539 union dscrptr **dscrptr = &args->dscr; 540 struct udf_mount *ump = args->ump; 541 struct long_ad *icb = args->icb; 542 struct udf_eccline *eccline; 543 uint64_t bit; 544 uint32_t sectornr, lb_size, dummy; 545 uint8_t *mem; 546 int error, eccsect; 547 548 error = udf_translate_vtop(ump, icb, §ornr, &dummy); 549 if (error) 550 return error; 551 552 lb_size = udf_rw32(ump->logical_vol->lb_size); 553 554 /* get our eccline */ 555 eccline = udf_geteccline(ump, sectornr, 0); 556 eccsect = sectornr - eccline->start_sector; 557 558 bit = (uint64_t) 1 << eccsect; 559 eccline->readin &= ~bit; /* just in case */ 560 eccline->present |= bit; 561 eccline->dirty &= ~bit; /* Err... euhm... clean? */ 562 563 eccline->refcnt++; 564 565 /* clear space */ 566 mem = ((uint8_t *) eccline->blob) + eccsect * lb_size; 567 memset(mem, 0, lb_size); 568 569 udf_puteccline(eccline); 570 571 *dscrptr = (union dscrptr *) mem; 572 return 0; 573 } 574 575 576 static void 577 udf_free_nodedscr_rmw(struct udf_strat_args *args) 578 { 579 struct udf_mount *ump = args->ump; 580 struct long_ad *icb = args->icb; 581 struct udf_eccline *eccline; 582 uint64_t bit; 583 uint32_t sectornr, dummy; 584 int error, eccsect; 585 586 error = udf_translate_vtop(ump, icb, §ornr, &dummy); 587 if (error) 588 return; 589 590 /* get our eccline */ 591 eccline = udf_geteccline(ump, sectornr, 0); 592 eccsect = sectornr - eccline->start_sector; 593 594 bit = (uint64_t) 1 << eccsect; 595 KASSERT(eccline->present & bit); 596 597 eccline->readin &= ~bit; /* just in case */ 598 /* XXX eccline->dirty? */ 599 600 KASSERT(eccline->refcnt >= 1); 601 eccline->refcnt--; 602 603 udf_puteccline(eccline); 604 } 605 606 607 static int 608 udf_read_nodedscr_rmw(struct udf_strat_args *args) 609 { 610 union dscrptr **dscrptr = &args->dscr; 611 struct udf_mount *ump = args->ump; 612 struct long_ad *icb = args->icb; 613 struct strat_private *priv; 614 struct udf_eccline *eccline; 615 uint64_t bit; 616 uint32_t sectornr, dummy; 617 uint8_t *pos; 618 int sector_size = ump->discinfo.sector_size; 619 int lb_size = udf_rw32(ump->logical_vol->lb_size); 620 int i, error, dscrlen, eccsect; 621 622 lb_size = lb_size; 623 KASSERT(sector_size == lb_size); 624 error = udf_translate_vtop(ump, icb, §ornr, &dummy); 625 if (error) 626 return error; 627 628 /* get our eccline */ 629 eccline = udf_geteccline(ump, sectornr, 0); 630 eccsect = sectornr - eccline->start_sector; 631 632 bit = (uint64_t) 1 << eccsect; 633 if ((eccline->present & bit) == 0) { 634 /* mark bit for readin */ 635 eccline->readin |= bit; 636 eccline->refcnt++; /* prevent recycling */ 637 KASSERT(eccline->bufs[eccsect] == NULL); 638 udf_puteccline(eccline); 639 640 /* wait for completion */ 641 priv = PRIV(eccline->ump); 642 mutex_enter(&priv->discstrat_mutex); 643 while (((eccline->present | eccline->error) & bit) == 0) { 644 error = cv_timedwait(&priv->discstrat_cv, 645 &priv->discstrat_mutex, 646 hz/8); 647 if (error == EWOULDBLOCK) 648 DPRINTF(LOCKING, ("eccline waiting for read\n")); 649 } 650 mutex_exit(&priv->discstrat_mutex); 651 652 /* reget our line */ 653 eccline = udf_geteccline(ump, sectornr, 0); 654 KASSERT(eccline->refcnt >= 1); 655 eccline->refcnt--; /* undo refcnt */ 656 657 if (eccline->error & bit) { 658 *dscrptr = NULL; 659 udf_puteccline(eccline); 660 return EIO; /* XXX error code */ 661 } 662 } 663 664 *dscrptr = (union dscrptr *) 665 (((uint8_t *) eccline->blob) + eccsect * sector_size); 666 667 /* code from read_phys_descr */ 668 /* check if its a valid tag */ 669 error = udf_check_tag(*dscrptr); 670 if (error) { 671 /* check if its an empty block */ 672 pos = (uint8_t *) *dscrptr; 673 for (i = 0; i < sector_size; i++, pos++) { 674 if (*pos) break; 675 } 676 if (i == sector_size) { 677 /* return no error but with no dscrptr */ 678 error = 0; 679 } 680 *dscrptr = NULL; 681 udf_puteccline(eccline); 682 return error; 683 } 684 685 /* calculate descriptor size */ 686 dscrlen = udf_tagsize(*dscrptr, sector_size); 687 error = udf_check_tag_payload(*dscrptr, dscrlen); 688 if (error) { 689 *dscrptr = NULL; 690 udf_puteccline(eccline); 691 return error; 692 } 693 694 /* we have a hold since it has a node descriptor */ 695 eccline->refcnt++; 696 udf_puteccline(eccline); 697 698 return 0; 699 } 700 701 702 static int 703 udf_write_nodedscr_rmw(struct udf_strat_args *args) 704 { 705 union dscrptr *dscrptr = args->dscr; 706 struct udf_mount *ump = args->ump; 707 struct long_ad *icb = args->icb; 708 struct udf_node *udf_node = args->udf_node; 709 struct udf_eccline *eccline; 710 uint64_t bit; 711 uint32_t sectornr, logsectornr, dummy; 712 // int waitfor = args->waitfor; 713 int sector_size = ump->discinfo.sector_size; 714 int lb_size = udf_rw32(ump->logical_vol->lb_size); 715 int error, eccsect; 716 717 lb_size = lb_size; 718 KASSERT(sector_size == lb_size); 719 sectornr = 0; 720 error = udf_translate_vtop(ump, icb, §ornr, &dummy); 721 if (error) 722 return error; 723 724 /* paranoia: add reference to the vnode to prevent recycling */ 725 vhold(udf_node->vnode); 726 727 /* get our eccline */ 728 eccline = udf_geteccline(ump, sectornr, 0); 729 eccsect = sectornr - eccline->start_sector; 730 731 bit = (uint64_t) 1 << eccsect; 732 733 /* old callback still pending? */ 734 if (eccline->bufs[eccsect]) { 735 DPRINTF(WRITE, ("udf_write_nodedscr_rmw: writing descriptor" 736 " over buffer?\n")); 737 nestiobuf_done(eccline->bufs[eccsect], 738 eccline->bufs_len[eccsect], 739 0); 740 eccline->bufs[eccsect] = NULL; 741 } 742 743 /* set sector number in the descriptor and validate */ 744 dscrptr = (union dscrptr *) 745 (((uint8_t *) eccline->blob) + eccsect * sector_size); 746 KASSERT(dscrptr == args->dscr); 747 748 logsectornr = udf_rw32(icb->loc.lb_num); 749 dscrptr->tag.tag_loc = udf_rw32(logsectornr); 750 udf_validate_tag_and_crc_sums(dscrptr); 751 752 udf_fixup_node_internals(ump, (uint8_t *) dscrptr, UDF_C_NODE); 753 754 /* set our flags */ 755 KASSERT(eccline->present & bit); 756 eccline->dirty |= bit; 757 758 KASSERT(udf_tagsize(dscrptr, sector_size) <= sector_size); 759 760 udf_node->outstanding_nodedscr--; 761 if (udf_node->outstanding_nodedscr == 0) { 762 /* XXX still using wakeup! */ 763 UDF_UNLOCK_NODE(udf_node, 0); 764 wakeup(&udf_node->outstanding_nodedscr); 765 } 766 holdrele(udf_node->vnode); 767 udf_puteccline(eccline); 768 769 /* XXX waitfor not used */ 770 return 0; 771 } 772 773 774 static void 775 udf_queuebuf_rmw(struct udf_strat_args *args) 776 { 777 struct udf_mount *ump = args->ump; 778 struct buf *buf = args->nestbuf; 779 struct desc_tag *tag; 780 struct strat_private *priv = PRIV(ump); 781 struct udf_eccline *eccline; 782 struct long_ad *node_ad_cpy; 783 uint64_t bit, *lmapping, *pmapping, *lmappos, *pmappos, blknr; 784 uint32_t buf_len, len, sectors, sectornr, our_sectornr; 785 uint32_t bpos; 786 uint16_t vpart_num; 787 uint8_t *fidblk, *src, *dst; 788 int sector_size = ump->discinfo.sector_size; 789 int blks = sector_size / DEV_BSIZE; 790 int eccsect, what, queue, error; 791 792 KASSERT(ump); 793 KASSERT(buf); 794 KASSERT(buf->b_iodone == nestiobuf_iodone); 795 796 blknr = buf->b_blkno; 797 our_sectornr = blknr / blks; 798 799 what = buf->b_udf_c_type; 800 queue = UDF_SHED_READING; 801 if ((buf->b_flags & B_READ) == 0) { 802 /* writing */ 803 queue = UDF_SHED_SEQWRITING; 804 if (what == UDF_C_ABSOLUTE) 805 queue = UDF_SHED_WRITING; 806 if (what == UDF_C_DSCR) 807 queue = UDF_SHED_WRITING; 808 if (what == UDF_C_NODE) 809 queue = UDF_SHED_WRITING; 810 } 811 812 if (queue == UDF_SHED_READING) { 813 DPRINTF(SHEDULE, ("\nudf_queuebuf_rmw READ %p : sector %d type %d," 814 "b_resid %d, b_bcount %d, b_bufsize %d\n", 815 buf, (uint32_t) buf->b_blkno / blks, buf->b_udf_c_type, 816 buf->b_resid, buf->b_bcount, buf->b_bufsize)); 817 818 /* mark bits for reading */ 819 buf_len = buf->b_bcount; 820 sectornr = our_sectornr; 821 eccline = udf_geteccline(ump, sectornr, 0); 822 eccsect = sectornr - eccline->start_sector; 823 bpos = 0; 824 while (buf_len) { 825 len = MIN(buf_len, sector_size); 826 if ((eccsect < 0) || (eccsect >= ump->packet_size)) { 827 udf_puteccline(eccline); 828 eccline = udf_geteccline(ump, sectornr, 0); 829 eccsect = sectornr - eccline->start_sector; 830 } 831 bit = (uint64_t) 1 << eccsect; 832 error = eccline->error & bit ? EIO : 0; 833 if (eccline->present & bit) { 834 src = (uint8_t *) eccline->blob + 835 eccsect * sector_size; 836 dst = (uint8_t *) buf->b_data + bpos; 837 if (!error) 838 memcpy(dst, src, len); 839 nestiobuf_done(buf, len, error); 840 } else { 841 eccline->readin |= bit; 842 KASSERT(eccline->bufs[eccsect] == NULL); 843 eccline->bufs[eccsect] = buf; 844 eccline->bufs_bpos[eccsect] = bpos; 845 eccline->bufs_len[eccsect] = len; 846 } 847 bpos += sector_size; 848 eccsect++; 849 sectornr++; 850 buf_len -= len; 851 } 852 udf_puteccline(eccline); 853 return; 854 } 855 856 if (queue == UDF_SHED_WRITING) { 857 DPRINTF(SHEDULE, ("\nudf_queuebuf_rmw WRITE %p : sector %d " 858 "type %d, b_resid %d, b_bcount %d, b_bufsize %d\n", 859 buf, (uint32_t) buf->b_blkno / blks, buf->b_udf_c_type, 860 buf->b_resid, buf->b_bcount, buf->b_bufsize)); 861 862 /* if we have FIDs fixup using buffer's sector number(s) */ 863 if (buf->b_udf_c_type == UDF_C_FIDS) 864 panic("UDF_C_FIDS in SHED_WRITING!\n"); 865 866 udf_fixup_node_internals(ump, buf->b_data, buf->b_udf_c_type); 867 868 /* copy parts into the bufs and set for writing */ 869 buf_len = buf->b_bcount; 870 sectornr = our_sectornr; 871 eccline = udf_geteccline(ump, sectornr, 0); 872 eccsect = sectornr - eccline->start_sector; 873 bpos = 0; 874 while (buf_len) { 875 len = MIN(buf_len, sector_size); 876 if ((eccsect < 0) || (eccsect >= ump->packet_size)) { 877 udf_puteccline(eccline); 878 eccline = udf_geteccline(ump, sectornr, 0); 879 eccsect = sectornr - eccline->start_sector; 880 } 881 bit = (uint64_t) 1 << eccsect; 882 KASSERT((eccline->readin & bit) == 0); 883 eccline->present |= bit; 884 eccline->dirty |= bit; 885 if (eccline->bufs[eccsect]) { 886 /* old callback still pending */ 887 nestiobuf_done(eccline->bufs[eccsect], 888 eccline->bufs_len[eccsect], 889 0); 890 eccline->bufs[eccsect] = NULL; 891 } 892 893 src = (uint8_t *) buf->b_data + bpos; 894 dst = (uint8_t *) eccline->blob + eccsect * sector_size; 895 if (len != sector_size) 896 memset(dst, 0, sector_size); 897 memcpy(dst, src, len); 898 899 /* note that its finished for this extent */ 900 eccline->bufs[eccsect] = NULL; 901 nestiobuf_done(buf, len, 0); 902 903 bpos += sector_size; 904 eccsect++; 905 sectornr++; 906 buf_len -= len; 907 } 908 udf_puteccline(eccline); 909 return; 910 911 } 912 913 /* sequential writing */ 914 KASSERT(queue == UDF_SHED_SEQWRITING); 915 DPRINTF(SHEDULE, ("\nudf_queuebuf_rmw SEQWRITE %p : sector XXXX " 916 "type %d, b_resid %d, b_bcount %d, b_bufsize %d\n", 917 buf, buf->b_udf_c_type, buf->b_resid, buf->b_bcount, 918 buf->b_bufsize)); 919 /* 920 * Buffers should not have been allocated to disc addresses yet on 921 * this queue. Note that a buffer can get multiple extents allocated. 922 * Note that it *looks* like the normal writing but its different in 923 * the details. 924 * 925 * lmapping contains lb_num relative to base partition. 926 * 927 * XXX should we try to claim/organize the allocated memory to 928 * block-aligned pieces? 929 */ 930 mutex_enter(&priv->seqwrite_mutex); 931 932 lmapping = ump->la_lmapping; 933 node_ad_cpy = ump->la_node_ad_cpy; 934 935 /* logically allocate buf and map it in the file */ 936 udf_late_allocate_buf(ump, buf, lmapping, node_ad_cpy, &vpart_num); 937 938 /* if we have FIDs, fixup using the new allocation table */ 939 if (buf->b_udf_c_type == UDF_C_FIDS) { 940 buf_len = buf->b_bcount; 941 bpos = 0; 942 lmappos = lmapping; 943 while (buf_len) { 944 sectornr = *lmappos++; 945 len = MIN(buf_len, sector_size); 946 fidblk = (uint8_t *) buf->b_data + bpos; 947 udf_fixup_fid_block(fidblk, sector_size, 948 0, len, sectornr); 949 bpos += len; 950 buf_len -= len; 951 } 952 } 953 if (buf->b_udf_c_type == UDF_C_METADATA_SBM) { 954 if (buf->b_lblkno == 0) { 955 /* update the tag location inside */ 956 tag = (struct desc_tag *) buf->b_data; 957 tag->tag_loc = udf_rw32(*lmapping); 958 udf_validate_tag_and_crc_sums(buf->b_data); 959 } 960 } 961 udf_fixup_node_internals(ump, buf->b_data, buf->b_udf_c_type); 962 963 /* 964 * Translate new mappings in lmapping to pmappings. 965 * pmapping to contain lb_nums as used for disc adressing. 966 */ 967 pmapping = ump->la_pmapping; 968 sectors = (buf->b_bcount + sector_size -1) / sector_size; 969 udf_translate_vtop_list(ump, sectors, vpart_num, lmapping, pmapping); 970 971 /* copy parts into the bufs and set for writing */ 972 pmappos = pmapping; 973 buf_len = buf->b_bcount; 974 sectornr = *pmappos++; 975 eccline = udf_geteccline(ump, sectornr, ECC_SEQWRITING); 976 eccsect = sectornr - eccline->start_sector; 977 bpos = 0; 978 while (buf_len) { 979 len = MIN(buf_len, sector_size); 980 eccsect = sectornr - eccline->start_sector; 981 if ((eccsect < 0) || (eccsect >= ump->packet_size)) { 982 eccline->flags |= ECC_SEQWRITING; 983 udf_puteccline(eccline); 984 eccline = udf_geteccline(ump, sectornr, ECC_SEQWRITING); 985 eccsect = sectornr - eccline->start_sector; 986 } 987 bit = (uint64_t) 1 << eccsect; 988 KASSERT((eccline->readin & bit) == 0); 989 eccline->present |= bit; 990 eccline->dirty |= bit; 991 eccline->bufs[eccsect] = NULL; 992 993 src = (uint8_t *) buf->b_data + bpos; 994 dst = (uint8_t *) 995 eccline->blob + eccsect * sector_size; 996 if (len != sector_size) 997 memset(dst, 0, sector_size); 998 memcpy(dst, src, len); 999 1000 /* note that its finished for this extent */ 1001 nestiobuf_done(buf, len, 0); 1002 1003 bpos += sector_size; 1004 sectornr = *pmappos++; 1005 buf_len -= len; 1006 } 1007 eccline->flags |= ECC_SEQWRITING; 1008 udf_puteccline(eccline); 1009 mutex_exit(&priv->seqwrite_mutex); 1010 } 1011 1012 /* --------------------------------------------------------------------- */ 1013 1014 static void 1015 udf_shedule_read_callback(struct buf *buf) 1016 { 1017 struct udf_eccline *eccline = BTOE(buf); 1018 struct udf_mount *ump = eccline->ump; 1019 uint64_t bit; 1020 uint8_t *src, *dst; 1021 int sector_size = ump->discinfo.sector_size; 1022 int error, i, len; 1023 1024 DPRINTF(ECCLINE, ("read callback called on buf %p\n", buf)); 1025 1026 /* post process read action */ 1027 KASSERT(eccline->flags & ECC_LOCKED); 1028 error = buf->b_error; 1029 for (i = 0; i < ump->packet_size; i++) { 1030 bit = (uint64_t) 1 << i; 1031 src = (uint8_t *) buf->b_data + i * sector_size; 1032 dst = (uint8_t *) eccline->blob + i * sector_size; 1033 if (eccline->present & bit) 1034 continue; 1035 eccline->present |= bit; 1036 if (error) 1037 eccline->error |= bit; 1038 if (eccline->bufs[i]) { 1039 dst = (uint8_t *) eccline->bufs[i]->b_data + 1040 eccline->bufs_bpos[i]; 1041 len = eccline->bufs_len[i]; 1042 if (!error) 1043 memcpy(dst, src, len); 1044 nestiobuf_done(eccline->bufs[i], len, error); 1045 eccline->bufs[i] = NULL; 1046 } 1047 1048 } 1049 KASSERT(buf->b_data == eccline->blob); 1050 KASSERT(eccline->present == ((uint64_t) 1 << ump->packet_size)-1); 1051 1052 /* 1053 * XXX TODO what to do on read errors? read in all sectors 1054 * synchronously and allocate a sparable entry? 1055 */ 1056 1057 udf_puteccline(eccline); 1058 DPRINTF(ECCLINE, ("read callback finished\n")); 1059 } 1060 1061 1062 static void 1063 udf_shedule_write_callback(struct buf *buf) 1064 { 1065 struct udf_eccline *eccline = BTOE(buf); 1066 struct udf_mount *ump = eccline->ump; 1067 uint64_t bit; 1068 int error, i; 1069 1070 DPRINTF(ECCLINE, ("write callback called on buf %p\n", buf)); 1071 1072 /* post process write action */ 1073 KASSERT(eccline->flags & ECC_LOCKED); 1074 error = buf->b_error; 1075 for (i = 0; i < ump->packet_size; i++) { 1076 bit = (uint64_t) 1 << i; 1077 if ((eccline->dirty & bit) == 0) 1078 continue; 1079 if (error) { 1080 eccline->error |= bit; 1081 } else { 1082 eccline->dirty &= ~bit; 1083 } 1084 1085 KASSERT(eccline->bufs[i] == 0); 1086 } 1087 KASSERT(eccline->dirty == 0); 1088 KASSERT(error == 0); 1089 1090 /* 1091 * XXX TODO on write errors allocate a sparable entry and reissue 1092 */ 1093 1094 udf_puteccline(eccline); 1095 DPRINTF(ECCLINE, ("write callback finished\n")); 1096 } 1097 1098 1099 static void 1100 udf_issue_eccline(struct udf_eccline *eccline, int queued_on) 1101 { 1102 struct udf_mount *ump = eccline->ump; 1103 struct strat_private *priv = PRIV(ump); 1104 struct buf *buf, *nestbuf; 1105 uint64_t bit, allbits = ((uint64_t) 1 << ump->packet_size)-1; 1106 uint32_t start; 1107 int sector_size = ump->discinfo.sector_size; 1108 int blks = sector_size / DEV_BSIZE; 1109 int i; 1110 1111 KASSERT(eccline->flags & ECC_LOCKED); 1112 1113 if (queued_on == UDF_SHED_READING) { 1114 DPRINTF(SHEDULE, ("udf_issue_eccline reading : ")); 1115 /* read all bits that are not yet present */ 1116 eccline->readin = (~eccline->present) & allbits; 1117 KASSERT(eccline->readin); 1118 start = eccline->start_sector; 1119 buf = eccline->buf; 1120 buf->b_flags = B_READ | B_ASYNC; 1121 SET(buf->b_cflags, BC_BUSY); /* mark buffer busy */ 1122 buf->b_oflags = 0; 1123 buf->b_iodone = udf_shedule_read_callback; 1124 buf->b_data = eccline->blob; 1125 buf->b_bcount = ump->packet_size * sector_size; 1126 buf->b_resid = buf->b_bcount; 1127 buf->b_bufsize = buf->b_bcount; 1128 buf->b_private = eccline; 1129 BIO_SETPRIO(buf, BPRIO_DEFAULT); 1130 buf->b_lblkno = buf->b_blkno = buf->b_rawblkno = start * blks; 1131 buf->b_proc = NULL; 1132 1133 if (eccline->present != 0) { 1134 for (i = 0; i < ump->packet_size; i++) { 1135 bit = (uint64_t) 1 << i; 1136 if (eccline->present & bit) { 1137 nestiobuf_done(buf, sector_size, 0); 1138 continue; 1139 } 1140 nestbuf = getiobuf(NULL, true); 1141 nestiobuf_setup(buf, nestbuf, i * sector_size, 1142 sector_size); 1143 /* adjust blocknumber to read */ 1144 nestbuf->b_blkno = buf->b_blkno + i*blks; 1145 nestbuf->b_rawblkno = buf->b_rawblkno + i*blks; 1146 1147 DPRINTF(SHEDULE, ("sector %d ", start + i)); 1148 1149 /* mutex dance since it could lock */ 1150 mutex_exit(&priv->discstrat_mutex); 1151 /* call asynchronous */ 1152 VOP_STRATEGY(ump->devvp, nestbuf); 1153 mutex_enter(&priv->discstrat_mutex); 1154 } 1155 DPRINTF(SHEDULE, ("\n")); 1156 return; 1157 } 1158 } else { 1159 /* write or seqwrite */ 1160 DPRINTF(SHEDULE, ("udf_issue_eccline writing or seqwriting : ")); 1161 DPRINTF(SHEDULE, ("\n\tpresent %"PRIx64", readin %"PRIx64", " 1162 "dirty %"PRIx64"\n\t", eccline->present, eccline->readin, 1163 eccline->dirty)); 1164 KASSERT(eccline->present == allbits); 1165 1166 start = eccline->start_sector; 1167 buf = eccline->buf; 1168 buf->b_flags = B_WRITE | B_ASYNC; 1169 SET(buf->b_cflags, BC_BUSY); /* mark buffer busy */ 1170 buf->b_oflags = 0; 1171 buf->b_iodone = udf_shedule_write_callback; 1172 buf->b_data = eccline->blob; 1173 buf->b_bcount = ump->packet_size * sector_size; 1174 buf->b_resid = buf->b_bcount; 1175 buf->b_bufsize = buf->b_bcount; 1176 buf->b_private = eccline; 1177 BIO_SETPRIO(buf, BPRIO_DEFAULT); 1178 buf->b_lblkno = buf->b_blkno = buf->b_rawblkno = start * blks; 1179 buf->b_proc = NULL; 1180 } 1181 1182 /* mutex dance since it could lock */ 1183 mutex_exit(&priv->discstrat_mutex); 1184 /* call asynchronous */ 1185 DPRINTF(SHEDULE, ("sector %d for %d\n", 1186 start, ump->packet_size)); 1187 VOP_STRATEGY(ump->devvp, buf); 1188 mutex_enter(&priv->discstrat_mutex); 1189 } 1190 1191 1192 static void 1193 udf_discstrat_thread(void *arg) 1194 { 1195 struct udf_mount *ump = (struct udf_mount *) arg; 1196 struct strat_private *priv = PRIV(ump); 1197 struct udf_eccline *eccline; 1198 struct timespec now, *last; 1199 uint64_t allbits = ((uint64_t) 1 << ump->packet_size)-1; 1200 int new_queue, wait, work; 1201 1202 work = 1; 1203 priv->thread_running = 1; 1204 mutex_enter(&priv->discstrat_mutex); 1205 priv->num_floating = 0; 1206 while (priv->run_thread || work || priv->num_floating) { 1207 /* get our time */ 1208 vfs_timestamp(&now); 1209 1210 /* maintenance: handle eccline state machine */ 1211 for(;;) { 1212 /* only peek at it */ 1213 eccline = udf_peek_eccline(priv, UDF_SHED_WAITING); 1214 if (eccline == NULL) 1215 break; 1216 1217 /* if not reading, wait until the time has come */ 1218 if ((priv->cur_queue != UDF_SHED_READING) && 1219 (eccline->wait_time.tv_sec - now.tv_sec > 0)) { 1220 UDF_UNLOCK_ECCLINE(eccline); 1221 /* all others are later, so break off */ 1222 break; 1223 } 1224 1225 /* release */ 1226 UDF_UNLOCK_ECCLINE(eccline); 1227 1228 /* do get it */ 1229 eccline = udf_pop_eccline(priv, UDF_SHED_WAITING); 1230 1231 /* requeue according to state */ 1232 new_queue = UDF_SHED_FREE; /* unlikely */ 1233 if (eccline->refcnt > 0) 1234 new_queue = UDF_SHED_IDLE; 1235 if (eccline->flags & ECC_WANTED) 1236 new_queue = UDF_SHED_IDLE; 1237 if (eccline->readin) 1238 new_queue = UDF_SHED_READING; 1239 if (eccline->dirty) { 1240 new_queue = UDF_SHED_READING; 1241 if (eccline->present == allbits) { 1242 new_queue = UDF_SHED_WRITING; 1243 if (eccline->flags & ECC_SEQWRITING) 1244 new_queue = UDF_SHED_SEQWRITING; 1245 } 1246 } 1247 udf_push_eccline(eccline, new_queue); 1248 } 1249 1250 /* maintenance: free excess ecclines */ 1251 while (priv->num_queued[UDF_SHED_FREE] > UDF_ECCLINE_MAXFREE) { 1252 eccline = udf_pop_eccline(priv, UDF_SHED_FREE); 1253 KASSERT(eccline); 1254 KASSERT(eccline->refcnt == 0); 1255 if (eccline->flags & ECC_WANTED) { 1256 /* we won the race, but we dont want to win */ 1257 DPRINTF(ECCLINE, ("Tried removing, pushed back to free list\n")); 1258 udf_push_eccline(eccline, UDF_SHED_IDLE); 1259 } else { 1260 DPRINTF(ECCLINE, ("Removing entry from free list\n")); 1261 udf_dispose_eccline(eccline); 1262 } 1263 } 1264 1265 /* process the current selected queue */ 1266 /* get our time */ 1267 vfs_timestamp(&now); 1268 last = &priv->last_queued[priv->cur_queue]; 1269 1270 /* get our line */ 1271 eccline = udf_pop_eccline(priv, priv->cur_queue); 1272 if (eccline) { 1273 wait = 0; 1274 new_queue = priv->cur_queue; 1275 DPRINTF(ECCLINE, ("UDF_ISSUE_ECCLINE\n")); 1276 1277 udf_issue_eccline(eccline, priv->cur_queue); 1278 } else { 1279 /* don't switch too quickly */ 1280 if (now.tv_sec - last->tv_sec < 2) { 1281 /* wait some time */ 1282 cv_timedwait(&priv->discstrat_cv, 1283 &priv->discstrat_mutex, hz); 1284 /* we assume there is work to be done */ 1285 work = 1; 1286 continue; 1287 } 1288 1289 /* XXX select on queue lengths ? */ 1290 wait = 1; 1291 /* check if we can/should switch */ 1292 new_queue = priv->cur_queue; 1293 if (bufq_peek(priv->queues[UDF_SHED_READING])) 1294 new_queue = UDF_SHED_READING; 1295 if (bufq_peek(priv->queues[UDF_SHED_WRITING])) 1296 new_queue = UDF_SHED_WRITING; 1297 if (bufq_peek(priv->queues[UDF_SHED_SEQWRITING])) 1298 new_queue = UDF_SHED_SEQWRITING; 1299 } 1300 1301 /* give room */ 1302 mutex_exit(&priv->discstrat_mutex); 1303 1304 if (new_queue != priv->cur_queue) { 1305 wait = 0; 1306 DPRINTF(SHEDULE, ("switching from %d to %d\n", 1307 priv->cur_queue, new_queue)); 1308 priv->cur_queue = new_queue; 1309 } 1310 mutex_enter(&priv->discstrat_mutex); 1311 1312 /* wait for more if needed */ 1313 if (wait) 1314 cv_timedwait(&priv->discstrat_cv, 1315 &priv->discstrat_mutex, hz/4); /* /8 */ 1316 1317 work = (bufq_peek(priv->queues[UDF_SHED_WAITING]) != NULL); 1318 work |= (bufq_peek(priv->queues[UDF_SHED_READING]) != NULL); 1319 work |= (bufq_peek(priv->queues[UDF_SHED_WRITING]) != NULL); 1320 work |= (bufq_peek(priv->queues[UDF_SHED_SEQWRITING]) != NULL); 1321 1322 DPRINTF(PARANOIA, ("work : (%d, %d, %d) -> work %d, float %d\n", 1323 (bufq_peek(priv->queues[UDF_SHED_READING]) != NULL), 1324 (bufq_peek(priv->queues[UDF_SHED_WRITING]) != NULL), 1325 (bufq_peek(priv->queues[UDF_SHED_SEQWRITING]) != NULL), 1326 work, priv->num_floating)); 1327 } 1328 1329 mutex_exit(&priv->discstrat_mutex); 1330 1331 /* tear down remaining ecclines */ 1332 mutex_enter(&priv->discstrat_mutex); 1333 KASSERT(bufq_peek(priv->queues[UDF_SHED_WAITING]) == NULL); 1334 KASSERT(bufq_peek(priv->queues[UDF_SHED_IDLE]) == NULL); 1335 KASSERT(bufq_peek(priv->queues[UDF_SHED_READING]) == NULL); 1336 KASSERT(bufq_peek(priv->queues[UDF_SHED_WRITING]) == NULL); 1337 KASSERT(bufq_peek(priv->queues[UDF_SHED_SEQWRITING]) == NULL); 1338 1339 KASSERT(priv->num_queued[UDF_SHED_WAITING] == 0); 1340 KASSERT(priv->num_queued[UDF_SHED_IDLE] == 0); 1341 KASSERT(priv->num_queued[UDF_SHED_READING] == 0); 1342 KASSERT(priv->num_queued[UDF_SHED_WRITING] == 0); 1343 KASSERT(priv->num_queued[UDF_SHED_SEQWRITING] == 0); 1344 1345 eccline = udf_pop_eccline(priv, UDF_SHED_FREE); 1346 while (eccline) { 1347 udf_dispose_eccline(eccline); 1348 eccline = udf_pop_eccline(priv, UDF_SHED_FREE); 1349 } 1350 KASSERT(priv->num_queued[UDF_SHED_FREE] == 0); 1351 mutex_exit(&priv->discstrat_mutex); 1352 1353 priv->thread_running = 0; 1354 priv->thread_finished = 1; 1355 wakeup(&priv->run_thread); 1356 kthread_exit(0); 1357 /* not reached */ 1358 } 1359 1360 /* --------------------------------------------------------------------- */ 1361 1362 /* 1363 * Buffer memory pool allocator. 1364 */ 1365 1366 static void * 1367 ecclinepool_page_alloc(struct pool *pp, int flags) 1368 { 1369 return (void *)uvm_km_alloc(kernel_map, 1370 MAXBSIZE, MAXBSIZE, 1371 ((flags & PR_WAITOK) ? 0 : UVM_KMF_NOWAIT | UVM_KMF_TRYLOCK) 1372 | UVM_KMF_WIRED /* UVM_KMF_PAGABLE? */); 1373 } 1374 1375 static void 1376 ecclinepool_page_free(struct pool *pp, void *v) 1377 { 1378 uvm_km_free(kernel_map, (vaddr_t)v, MAXBSIZE, UVM_KMF_WIRED); 1379 } 1380 1381 static struct pool_allocator ecclinepool_allocator = { 1382 .pa_alloc = ecclinepool_page_alloc, 1383 .pa_free = ecclinepool_page_free, 1384 .pa_pagesz = MAXBSIZE, 1385 }; 1386 1387 1388 static void 1389 udf_discstrat_init_rmw(struct udf_strat_args *args) 1390 { 1391 struct udf_mount *ump = args->ump; 1392 struct strat_private *priv = PRIV(ump); 1393 uint32_t lb_size, blobsize, hashline; 1394 int i; 1395 1396 KASSERT(ump); 1397 KASSERT(ump->logical_vol); 1398 KASSERT(priv == NULL); 1399 1400 lb_size = udf_rw32(ump->logical_vol->lb_size); 1401 blobsize = ump->packet_size * lb_size; 1402 KASSERT(lb_size > 0); 1403 KASSERT(ump->packet_size <= 64); 1404 1405 /* initialise our memory space */ 1406 ump->strategy_private = malloc(sizeof(struct strat_private), 1407 M_UDFTEMP, M_WAITOK); 1408 priv = ump->strategy_private; 1409 memset(priv, 0 , sizeof(struct strat_private)); 1410 1411 /* initialise locks */ 1412 cv_init(&priv->discstrat_cv, "udfstrat"); 1413 mutex_init(&priv->discstrat_mutex, MUTEX_DEFAULT, IPL_NONE); 1414 mutex_init(&priv->seqwrite_mutex, MUTEX_DEFAULT, IPL_NONE); 1415 1416 /* initialise struct eccline pool */ 1417 pool_init(&priv->eccline_pool, sizeof(struct udf_eccline), 1418 0, 0, 0, "udf_eccline_pool", NULL, IPL_NONE); 1419 1420 /* initialise eccline blob pool */ 1421 ecclinepool_allocator.pa_pagesz = blobsize; 1422 pool_init(&priv->ecclineblob_pool, blobsize, 1423 0, 0, 0, "udf_eccline_blob", &ecclinepool_allocator, IPL_NONE); 1424 1425 /* initialise main queues */ 1426 for (i = 0; i < UDF_SHED_MAX; i++) { 1427 priv->num_queued[i] = 0; 1428 vfs_timestamp(&priv->last_queued[i]); 1429 } 1430 bufq_alloc(&priv->queues[UDF_SHED_WAITING], "fcfs", 1431 BUFQ_SORT_RAWBLOCK); 1432 bufq_alloc(&priv->queues[UDF_SHED_READING], "disksort", 1433 BUFQ_SORT_RAWBLOCK); 1434 bufq_alloc(&priv->queues[UDF_SHED_WRITING], "disksort", 1435 BUFQ_SORT_RAWBLOCK); 1436 bufq_alloc(&priv->queues[UDF_SHED_SEQWRITING], "disksort", 0); 1437 1438 /* initialise administrative queues */ 1439 bufq_alloc(&priv->queues[UDF_SHED_IDLE], "fcfs", 0); 1440 bufq_alloc(&priv->queues[UDF_SHED_FREE], "fcfs", 0); 1441 1442 for (hashline = 0; hashline < UDF_ECCBUF_HASHSIZE; hashline++) { 1443 LIST_INIT(&priv->eccline_hash[hashline]); 1444 } 1445 1446 /* create our disk strategy thread */ 1447 priv->cur_queue = UDF_SHED_READING; 1448 priv->thread_finished = 0; 1449 priv->thread_running = 0; 1450 priv->run_thread = 1; 1451 if (kthread_create(PRI_NONE, 0 /* KTHREAD_MPSAFE*/, NULL /* cpu_info*/, 1452 udf_discstrat_thread, ump, &priv->queue_lwp, 1453 "%s", "udf_rw")) { 1454 panic("fork udf_rw"); 1455 } 1456 1457 /* wait for thread to spin up */ 1458 while (!priv->thread_running) { 1459 tsleep(&priv->thread_running, PRIBIO+1, "udfshedstart", hz); 1460 } 1461 } 1462 1463 1464 static void 1465 udf_discstrat_finish_rmw(struct udf_strat_args *args) 1466 { 1467 struct udf_mount *ump = args->ump; 1468 struct strat_private *priv = PRIV(ump); 1469 1470 if (ump == NULL) 1471 return; 1472 1473 /* stop our sheduling thread */ 1474 KASSERT(priv->run_thread == 1); 1475 priv->run_thread = 0; 1476 wakeup(priv->queue_lwp); 1477 while (!priv->thread_finished) { 1478 tsleep(&priv->run_thread, PRIBIO + 1, "udfshedfin", hz); 1479 } 1480 /* kthread should be finished now */ 1481 1482 /* cleanup our pools */ 1483 pool_destroy(&priv->eccline_pool); 1484 pool_destroy(&priv->ecclineblob_pool); 1485 1486 cv_destroy(&priv->discstrat_cv); 1487 mutex_destroy(&priv->discstrat_mutex); 1488 mutex_destroy(&priv->seqwrite_mutex); 1489 1490 /* free our private space */ 1491 free(ump->strategy_private, M_UDFTEMP); 1492 ump->strategy_private = NULL; 1493 } 1494 1495 /* --------------------------------------------------------------------- */ 1496 1497 struct udf_strategy udf_strat_rmw = 1498 { 1499 udf_create_nodedscr_rmw, 1500 udf_free_nodedscr_rmw, 1501 udf_read_nodedscr_rmw, 1502 udf_write_nodedscr_rmw, 1503 udf_queuebuf_rmw, 1504 udf_discstrat_init_rmw, 1505 udf_discstrat_finish_rmw 1506 }; 1507 1508