sys/vfs/hammer2/hammer2_io.c

   1 /*
   2  * Copyright (c) 2013-2014 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@dragonflybsd.org>
   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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "hammer2.h"
  36
  37 /*
  38  * Implements an abstraction layer for synchronous and asynchronous
  39  * buffered device I/O.  Can be used for OS-abstraction but the main
  40  * purpose is to allow larger buffers to be used against hammer2_chain's
  41  * using smaller allocations, without causing deadlocks.
  42  *
  43  */
  44 static int hammer2_io_cleanup_callback(hammer2_io_t *dio, void *arg);
  45
  46 static int
  47 hammer2_io_cmp(hammer2_io_t *io1, hammer2_io_t *io2)
  48 {
  49         if (io2->pbase < io1->pbase)
  50                 return(-1);
  51         if (io2->pbase > io1->pbase)
  52                 return(1);
  53         return(0);
  54 }
  55
  56 RB_PROTOTYPE2(hammer2_io_tree, hammer2_io, rbnode, hammer2_io_cmp, off_t);
  57 RB_GENERATE2(hammer2_io_tree, hammer2_io, rbnode, hammer2_io_cmp,
  58                 off_t, pbase);
  59
  60 struct hammer2_cleanupcb_info {
  61         struct hammer2_io_tree tmptree;
  62         int     count;
  63 };
  64
  65 #define HAMMER2_GETBLK_GOOD     0
  66 #define HAMMER2_GETBLK_QUEUED   1
  67 #define HAMMER2_GETBLK_OWNED    2
  68
  69 /*
  70  * Allocate/Locate the requested dio, reference it, issue or queue iocb.
  71  */
  72 void
  73 hammer2_io_getblk(hammer2_mount_t *hmp, off_t lbase, int lsize,
  74                   hammer2_iocb_t *iocb)
  75 {
  76         hammer2_io_t *dio;
  77         hammer2_io_t *xio;
  78         off_t pbase;
  79         off_t pmask;
  80         /*
  81          * XXX after free, buffer reuse case w/ different size can clash
  82          * with dio cache.  Lets avoid it for now.  Ultimate we need to
  83          * invalidate the dio cache when freeing blocks to allow a mix
  84          * of 16KB and 64KB block sizes).
  85          */
  86         /*int psize = hammer2_devblksize(lsize);*/
  87         int psize = HAMMER2_PBUFSIZE;
  88         int refs;
  89
  90         pmask = ~(hammer2_off_t)(psize - 1);
  91
  92         KKASSERT((1 << (int)(lbase & HAMMER2_OFF_MASK_RADIX)) == lsize);
  93         lbase &= ~HAMMER2_OFF_MASK_RADIX;
  94         pbase = lbase & pmask;
  95         KKASSERT(pbase != 0 && ((lbase + lsize - 1) & pmask) == pbase);
  96
  97         /*
  98          * Access/Allocate the DIO, bump dio->refs to prevent destruction.
  99          */
 100         spin_lock_shared(&hmp->io_spin);
 101         dio = RB_LOOKUP(hammer2_io_tree, &hmp->iotree, pbase);
 102         if (dio) {
 103                 if ((atomic_fetchadd_int(&dio->refs, 1) &
 104                      HAMMER2_DIO_MASK) == 0) {
 105                         atomic_add_int(&dio->hmp->iofree_count, -1);
 106                 }
 107                 spin_unlock_shared(&hmp->io_spin);
 108         } else {
 109                 spin_unlock_shared(&hmp->io_spin);
 110                 dio = kmalloc(sizeof(*dio), M_HAMMER2, M_INTWAIT | M_ZERO);
 111                 dio->hmp = hmp;
 112                 dio->pbase = pbase;
 113                 dio->psize = psize;
 114                 dio->refs = 1;
 115                 spin_init(&dio->spin, "h2dio");
 116                 TAILQ_INIT(&dio->iocbq);
 117                 spin_lock(&hmp->io_spin);
 118                 xio = RB_INSERT(hammer2_io_tree, &hmp->iotree, dio);
 119                 if (xio == NULL) {
 120                         atomic_add_int(&hammer2_dio_count, 1);
 121                         spin_unlock(&hmp->io_spin);
 122                 } else {
 123                         if ((atomic_fetchadd_int(&xio->refs, 1) &
 124                              HAMMER2_DIO_MASK) == 0) {
 125                                 atomic_add_int(&xio->hmp->iofree_count, -1);
 126                         }
 127                         spin_unlock(&hmp->io_spin);
 128                         kfree(dio, M_HAMMER2);
 129                         dio = xio;
 130                 }
 131         }
 132
 133         /*
 134          * Obtain/Validate the buffer.
 135          */
 136         iocb->dio = dio;
 137
 138         for (;;) {
 139                 refs = dio->refs;
 140                 cpu_ccfence();
 141
 142                 /*
 143                  * Issue the iocb immediately if the buffer is already good.
 144                  * Once set GOOD cannot be cleared until refs drops to 0.
 145                  */
 146                 if (refs & HAMMER2_DIO_GOOD) {
 147                         iocb->callback(iocb);
 148                         break;
 149                 }
 150
 151                 /*
 152                  * Try to own the DIO by setting INPROG so we can issue
 153                  * I/O on it.
 154                  */
 155                 if (refs & HAMMER2_DIO_INPROG) {
 156                         /*
 157                          * If DIO_INPROG is already set then set WAITING and
 158                          * queue the iocb.
 159                          */
 160                         spin_lock(&dio->spin);
 161                         if (atomic_cmpset_int(&dio->refs, refs,
 162                                               refs | HAMMER2_DIO_WAITING)) {
 163                                 iocb->flags |= HAMMER2_IOCB_ONQ |
 164                                                HAMMER2_IOCB_INPROG;
 165                                 TAILQ_INSERT_TAIL(&dio->iocbq, iocb, entry);
 166                                 spin_unlock(&dio->spin);
 167                                 break;
 168                         }
 169                         spin_unlock(&dio->spin);
 170                         /* retry */
 171                 } else {
 172                         /*
 173                          * If DIO_INPROG is not set then set it and issue the
 174                          * callback immediately to start I/O.
 175                          */
 176                         if (atomic_cmpset_int(&dio->refs, refs,
 177                                               refs | HAMMER2_DIO_INPROG)) {
 178                                 iocb->flags |= HAMMER2_IOCB_INPROG;
 179                                 iocb->callback(iocb);
 180                                 break;
 181                         }
 182                         /* retry */
 183                 }
 184                 /* retry */
 185         }
 186         if (dio->act < 5)
 187                 ++dio->act;
 188 }
 189
 190 /*
 191  * The originator of the iocb is finished with it.
 192  */
 193 void
 194 hammer2_io_complete(hammer2_iocb_t *iocb)
 195 {
 196         hammer2_io_t *dio = iocb->dio;
 197         uint32_t orefs;
 198         uint32_t nrefs;
 199         uint32_t oflags;
 200         uint32_t nflags;
 201
 202         /*
 203          * If IOCB_INPROG was not set completion is synchronous due to the
 204          * buffer already being good.  We can simply set IOCB_DONE and return.
 205          * In this situation DIO_INPROG is not set and we have no visibility
 206          * on dio->bp.
 207          */
 208         if ((iocb->flags & HAMMER2_IOCB_INPROG) == 0) {
 209                 iocb->flags |= HAMMER2_IOCB_DONE;
 210                 return;
 211         }
 212
 213         /*
 214          * The iocb was queued, obtained DIO_INPROG, and its callback was
 215          * made.  The callback is now complete.  We still own DIO_INPROG.
 216          *
 217          * We can set DIO_GOOD if no error occurred, which gives certain
 218          * stability guarantees to dio->bp and allows other accessors to
 219          * short-cut access.  DIO_GOOD cannot be cleared until the last
 220          * ref is dropped.
 221          */
 222         KKASSERT(dio->refs & HAMMER2_DIO_INPROG);
 223         if (dio->bp) {
 224                 BUF_KERNPROC(dio->bp);
 225                 if ((dio->bp->b_flags & B_ERROR) == 0) {
 226                         KKASSERT(dio->bp->b_flags & B_CACHE);
 227                         atomic_set_int(&dio->refs, HAMMER2_DIO_GOOD);
 228                 }
 229         }
 230
 231         for (;;) {
 232                 oflags = iocb->flags;
 233                 cpu_ccfence();
 234                 nflags = oflags;
 235                 nflags &= ~(HAMMER2_IOCB_WAKEUP | HAMMER2_IOCB_INPROG);
 236                 nflags |= HAMMER2_IOCB_DONE;
 237
 238                 if (atomic_cmpset_int(&iocb->flags, oflags, nflags)) {
 239                         if (oflags & HAMMER2_IOCB_WAKEUP)
 240                                 wakeup(iocb);
 241                         /* SMP: iocb is now stale */
 242                         break;
 243                 }
 244                 /* retry */
 245         }
 246         iocb = NULL;
 247
 248         /*
 249          * Now finish up the dio.  If another iocb is pending chain to it
 250          * leaving DIO_INPROG set.  Otherwise clear DIO_INPROG
 251          * (and DIO_WAITING).
 252          *
 253          * NOTE: The TAILQ is not stable until the spin-lock is held.
 254          */
 255         for (;;) {
 256                 orefs = dio->refs;
 257                 nrefs = orefs & ~(HAMMER2_DIO_WAITING | HAMMER2_DIO_INPROG);
 258
 259                 if (orefs & HAMMER2_DIO_WAITING) {
 260                         spin_lock(&dio->spin);
 261                         iocb = TAILQ_FIRST(&dio->iocbq);
 262                         if (iocb) {
 263                                 TAILQ_REMOVE(&dio->iocbq, iocb, entry);
 264                                 spin_unlock(&dio->spin);
 265                                 iocb->callback(iocb);   /* chained */
 266                                 break;
 267                         } else if (atomic_cmpset_int(&dio->refs,
 268                                                      orefs, nrefs)) {
 269                                 spin_unlock(&dio->spin);
 270                                 break;
 271                         }
 272                         spin_unlock(&dio->spin);
 273                         /* retry */
 274                 } else if (atomic_cmpset_int(&dio->refs, orefs, nrefs)) {
 275                         break;
 276                 } /* else retry */
 277                 /* retry */
 278         }
 279         /* SMP: dio is stale now */
 280 }
 281
 282 /*
 283  * Wait for an iocb's I/O to finish.
 284  */
 285 void
 286 hammer2_iocb_wait(hammer2_iocb_t *iocb)
 287 {
 288         uint32_t oflags;
 289         uint32_t nflags;
 290
 291         for (;;) {
 292                 oflags = iocb->flags;
 293                 cpu_ccfence();
 294                 nflags = oflags | HAMMER2_IOCB_WAKEUP;
 295                 if (oflags & HAMMER2_IOCB_DONE)
 296                         break;
 297                 tsleep_interlock(iocb, 0);
 298                 if (atomic_cmpset_int(&iocb->flags, oflags, nflags)) {
 299                         tsleep(iocb, PINTERLOCKED, "h2iocb", hz);
 300                 }
 301         }
 302
 303 }
 304
 305 /*
 306  * Release our ref on *diop.
 307  *
 308  * On the last ref we must atomically clear DIO_GOOD and set DIO_INPROG,
 309  * then dispose of the underlying buffer.
 310  */
 311 void
 312 hammer2_io_putblk(hammer2_io_t **diop)
 313 {
 314         hammer2_mount_t *hmp;
 315         hammer2_io_t *dio;
 316         hammer2_iocb_t iocb;
 317         struct buf *bp;
 318         off_t peof;
 319         off_t pbase;
 320         int psize;
 321         int refs;
 322
 323         dio = *diop;
 324         *diop = NULL;
 325
 326         /*
 327          * Drop refs, on 1->0 transition clear flags, set INPROG.
 328          */
 329         for (;;) {
 330                 refs = dio->refs;
 331
 332                 if ((refs & HAMMER2_DIO_MASK) == 1) {
 333                         KKASSERT((refs & HAMMER2_DIO_INPROG) == 0);
 334                         if (atomic_cmpset_int(&dio->refs, refs,
 335                                               ((refs - 1) &
 336                                                ~(HAMMER2_DIO_GOOD |
 337                                                  HAMMER2_DIO_DIRTY)) |
 338                                               HAMMER2_DIO_INPROG)) {
 339                                 break;
 340                         }
 341                         /* retry */
 342                 } else {
 343                         if (atomic_cmpset_int(&dio->refs, refs, refs - 1))
 344                                 return;
 345                         /* retry */
 346                 }
 347                 /* retry */
 348         }
 349
 350         /*
 351          * We have set DIO_INPROG to gain control of the buffer and we have
 352          * cleared DIO_GOOD to prevent other accessors from thinking it is
 353          * still good.
 354          *
 355          * We can now dispose of the buffer, and should do it before calling
 356          * io_complete() in case there's a race against a new reference
 357          * which causes io_complete() to chain and instantiate the bp again.
 358          */
 359         pbase = dio->pbase;
 360         psize = dio->psize;
 361         bp = dio->bp;
 362         dio->bp = NULL;
 363
 364         if (refs & HAMMER2_DIO_GOOD) {
 365                 KKASSERT(bp != NULL);
 366                 if (refs & HAMMER2_DIO_DIRTY) {
 367                         if (hammer2_cluster_enable) {
 368                                 peof = (pbase + HAMMER2_SEGMASK64) &
 369                                        ~HAMMER2_SEGMASK64;
 370                                 cluster_write(bp, peof, psize, 4);
 371                         } else {
 372                                 bp->b_flags |= B_CLUSTEROK;
 373                                 bdwrite(bp);
 374                         }
 375                 } else if (bp->b_flags & (B_ERROR | B_INVAL | B_RELBUF)) {
 376                         brelse(bp);
 377                 } else {
 378                         bqrelse(bp);
 379                 }
 380         } else if (bp) {
 381                 if (refs & HAMMER2_DIO_DIRTY) {
 382                         bdwrite(bp);
 383                 } else {
 384                         brelse(bp);
 385                 }
 386         }
 387
 388         /*
 389          * The instant we call io_complete dio is a free agent again and
 390          * can be ripped out from under us.
 391          *
 392          * we can cleanup our final DIO_INPROG by simulating an iocb
 393          * completion.
 394          */
 395         hmp = dio->hmp;                         /* extract fields */
 396         atomic_add_int(&hmp->iofree_count, 1);
 397         cpu_ccfence();
 398
 399         iocb.dio = dio;
 400         iocb.flags = HAMMER2_IOCB_INPROG;
 401         hammer2_io_complete(&iocb);
 402         dio = NULL;                             /* dio stale */
 403
 404         /*
 405          * We cache free buffers so re-use cases can use a shared lock, but
 406          * if too many build up we have to clean them out.
 407          */
 408         if (hmp->iofree_count > 1000) {
 409                 struct hammer2_cleanupcb_info info;
 410
 411                 RB_INIT(&info.tmptree);
 412                 spin_lock(&hmp->io_spin);
 413                 if (hmp->iofree_count > 1000) {
 414                         info.count = hmp->iofree_count / 2;
 415                         RB_SCAN(hammer2_io_tree, &hmp->iotree, NULL,
 416                                 hammer2_io_cleanup_callback, &info);
 417                 }
 418                 spin_unlock(&hmp->io_spin);
 419                 hammer2_io_cleanup(hmp, &info.tmptree);
 420         }
 421 }
 422
 423 /*
 424  * Cleanup any dio's with (INPROG | refs) == 0.
 425  *
 426  * Called to clean up cached DIOs on umount after all activity has been
 427  * flushed.
 428  */
 429 static
 430 int
 431 hammer2_io_cleanup_callback(hammer2_io_t *dio, void *arg)
 432 {
 433         struct hammer2_cleanupcb_info *info = arg;
 434         hammer2_io_t *xio;
 435
 436         if ((dio->refs & (HAMMER2_DIO_MASK | HAMMER2_DIO_INPROG)) == 0) {
 437                 if (dio->act > 0) {
 438                         --dio->act;
 439                         return 0;
 440                 }
 441                 KKASSERT(dio->bp == NULL);
 442                 RB_REMOVE(hammer2_io_tree, &dio->hmp->iotree, dio);
 443                 xio = RB_INSERT(hammer2_io_tree, &info->tmptree, dio);
 444                 KKASSERT(xio == NULL);
 445                 if (--info->count <= 0) /* limit scan */
 446                         return(-1);
 447         }
 448         return 0;
 449 }
 450
 451 void
 452 hammer2_io_cleanup(hammer2_mount_t *hmp, struct hammer2_io_tree *tree)
 453 {
 454         hammer2_io_t *dio;
 455
 456         while ((dio = RB_ROOT(tree)) != NULL) {
 457                 RB_REMOVE(hammer2_io_tree, tree, dio);
 458                 KKASSERT(dio->bp == NULL &&
 459                     (dio->refs & (HAMMER2_DIO_MASK | HAMMER2_DIO_INPROG)) == 0);
 460                 kfree(dio, M_HAMMER2);
 461                 atomic_add_int(&hammer2_dio_count, -1);
 462                 atomic_add_int(&hmp->iofree_count, -1);
 463         }
 464 }
 465
 466 /*
 467  * Returns a pointer to the requested data.
 468  */
 469 char *
 470 hammer2_io_data(hammer2_io_t *dio, off_t lbase)
 471 {
 472         struct buf *bp;
 473         int off;
 474
 475         bp = dio->bp;
 476         KKASSERT(bp != NULL);
 477         off = (lbase & ~HAMMER2_OFF_MASK_RADIX) - bp->b_loffset;
 478         KKASSERT(off >= 0 && off < bp->b_bufsize);
 479         return(bp->b_data + off);
 480 }
 481
 482 /*
 483  * Helpers for hammer2_io_new*() functions
 484  */
 485 static
 486 void
 487 hammer2_iocb_new_callback(hammer2_iocb_t *iocb)
 488 {
 489         hammer2_io_t *dio = iocb->dio;
 490         int gbctl = (iocb->flags & HAMMER2_IOCB_QUICK) ? GETBLK_NOWAIT : 0;
 491
 492         /*
 493          * If IOCB_INPROG is not set the dio already has a good buffer and we
 494          * can't mess with it other than zero the requested range.
 495          *
 496          * If IOCB_INPROG is set we also own DIO_INPROG at this time and can
 497          * do what needs to be done with dio->bp.
 498          */
 499         if (iocb->flags & HAMMER2_IOCB_INPROG) {
 500                 if ((iocb->flags & HAMMER2_IOCB_READ) == 0) {
 501                         if (iocb->lsize == dio->psize) {
 502                                 /*
 503                                  * Fully covered buffer, try to optimize to
 504                                  * avoid any I/O.  We might already have the
 505                                  * buffer due to iocb chaining.
 506                                  */
 507                                 if (dio->bp == NULL) {
 508                                         dio->bp = getblk(dio->hmp->devvp,
 509                                                          dio->pbase, dio->psize,
 510                                                          gbctl, 0);
 511                                 }
 512                                 if (dio->bp) {
 513                                         vfs_bio_clrbuf(dio->bp);
 514                                         dio->bp->b_flags |= B_CACHE;
 515                                 }
 516                         } else if (iocb->flags & HAMMER2_IOCB_QUICK) {
 517                                 /*
 518                                  * Partial buffer, quick mode.  Do nothing.
 519                                  * Do not instantiate the buffer or try to
 520                                  * mark it B_CACHE because other portions of
 521                                  * the buffer might have to be read by other
 522                                  * accessors.
 523                                  */
 524                         } else if (dio->bp == NULL ||
 525                                    (dio->bp->b_flags & B_CACHE) == 0) {
 526                                 /*
 527                                  * Partial buffer, normal mode, requires
 528                                  * read-before-write.  Chain the read.
 529                                  *
 530                                  * We might already have the buffer due to
 531                                  * iocb chaining.  XXX unclear if we really
 532                                  * need to write/release it and reacquire
 533                                  * in that case.
 534                                  *
 535                                  * QUEUE ASYNC I/O, IOCB IS NOT YET COMPLETE.
 536                                  */
 537                                 if (dio->bp) {
 538                                         if (dio->refs & HAMMER2_DIO_DIRTY)
 539                                                 bdwrite(dio->bp);
 540                                         else
 541                                                 bqrelse(dio->bp);
 542                                         dio->bp = NULL;
 543                                 }
 544                                 iocb->flags |= HAMMER2_IOCB_READ;
 545                                 breadcb(dio->hmp->devvp,
 546                                         dio->pbase, dio->psize,
 547                                         hammer2_io_callback, iocb);
 548                                 return;
 549                         } /* else buffer is good */
 550                 } /* else callback from breadcb is complete */
 551         }
 552         if (dio->bp) {
 553                 if (iocb->flags & HAMMER2_IOCB_ZERO)
 554                         bzero(hammer2_io_data(dio, iocb->lbase), iocb->lsize);
 555                 atomic_set_int(&dio->refs, HAMMER2_DIO_DIRTY);
 556         }
 557         hammer2_io_complete(iocb);
 558 }
 559
 560 static
 561 int
 562 _hammer2_io_new(hammer2_mount_t *hmp, off_t lbase, int lsize,
 563                 hammer2_io_t **diop, int flags)
 564 {
 565         hammer2_iocb_t iocb;
 566         hammer2_io_t *dio;
 567
 568         iocb.callback = hammer2_iocb_new_callback;
 569         iocb.cluster = NULL;
 570         iocb.chain = NULL;
 571         iocb.ptr = NULL;
 572         iocb.lbase = lbase;
 573         iocb.lsize = lsize;
 574         iocb.flags = flags;
 575         iocb.error = 0;
 576         hammer2_io_getblk(hmp, lbase, lsize, &iocb);
 577         if ((iocb.flags & HAMMER2_IOCB_DONE) == 0)
 578                 hammer2_iocb_wait(&iocb);
 579         dio = *diop = iocb.dio;
 580
 581         return (iocb.error);
 582 }
 583
 584 int
 585 hammer2_io_new(hammer2_mount_t *hmp, off_t lbase, int lsize,
 586                hammer2_io_t **diop)
 587 {
 588         return(_hammer2_io_new(hmp, lbase, lsize, diop, HAMMER2_IOCB_ZERO));
 589 }
 590
 591 int
 592 hammer2_io_newnz(hammer2_mount_t *hmp, off_t lbase, int lsize,
 593                hammer2_io_t **diop)
 594 {
 595         return(_hammer2_io_new(hmp, lbase, lsize, diop, 0));
 596 }
 597
 598 int
 599 hammer2_io_newq(hammer2_mount_t *hmp, off_t lbase, int lsize,
 600                hammer2_io_t **diop)
 601 {
 602         return(_hammer2_io_new(hmp, lbase, lsize, diop, HAMMER2_IOCB_QUICK));
 603 }
 604
 605 static
 606 void
 607 hammer2_iocb_bread_callback(hammer2_iocb_t *iocb)
 608 {
 609         hammer2_io_t *dio = iocb->dio;
 610         off_t peof;
 611         int error;
 612
 613         /*
 614          * If IOCB_INPROG is not set the dio already has a good buffer and we
 615          * can't mess with it other than zero the requested range.
 616          *
 617          * If IOCB_INPROG is set we also own DIO_INPROG at this time and can
 618          * do what needs to be done with dio->bp.
 619          */
 620         if (iocb->flags & HAMMER2_IOCB_INPROG) {
 621                 if (dio->bp && (dio->bp->b_flags & B_CACHE)) {
 622                         /*
 623                          * Already good, likely due to being chained from
 624                          * another iocb.
 625                          */
 626                         error = 0;
 627                 } else if (hammer2_cluster_enable) {
 628                         /*
 629                          * Synchronous cluster I/O for now.
 630                          */
 631                         if (dio->bp) {
 632                                 bqrelse(dio->bp);
 633                                 dio->bp = NULL;
 634                         }
 635                         peof = (dio->pbase + HAMMER2_SEGMASK64) &
 636                                ~HAMMER2_SEGMASK64;
 637                         error = cluster_read(dio->hmp->devvp, peof, dio->pbase,
 638                                              dio->psize,
 639                                              dio->psize, HAMMER2_PBUFSIZE*4,
 640                                              &dio->bp);
 641                 } else {
 642                         /*
 643                          * Synchronous I/O for now.
 644                          */
 645                         if (dio->bp) {
 646                                 bqrelse(dio->bp);
 647                                 dio->bp = NULL;
 648                         }
 649                         error = bread(dio->hmp->devvp, dio->pbase,
 650                                       dio->psize, &dio->bp);
 651                 }
 652                 if (error) {
 653                         brelse(dio->bp);
 654                         dio->bp = NULL;
 655                 }
 656         }
 657         hammer2_io_complete(iocb);
 658 }
 659
 660 int
 661 hammer2_io_bread(hammer2_mount_t *hmp, off_t lbase, int lsize,
 662                 hammer2_io_t **diop)
 663 {
 664         hammer2_iocb_t iocb;
 665         hammer2_io_t *dio;
 666
 667         iocb.callback = hammer2_iocb_bread_callback;
 668         iocb.cluster = NULL;
 669         iocb.chain = NULL;
 670         iocb.ptr = NULL;
 671         iocb.lbase = lbase;
 672         iocb.lsize = lsize;
 673         iocb.flags = 0;
 674         iocb.error = 0;
 675         hammer2_io_getblk(hmp, lbase, lsize, &iocb);
 676         if ((iocb.flags & HAMMER2_IOCB_DONE) == 0)
 677                 hammer2_iocb_wait(&iocb);
 678         dio = *diop = iocb.dio;
 679
 680         return (iocb.error);
 681 }
 682
 683 /*
 684  * System buf/bio async callback extracts the iocb and chains
 685  * to the iocb callback.
 686  */
 687 void
 688 hammer2_io_callback(struct bio *bio)
 689 {
 690         struct buf *dbp = bio->bio_buf;
 691         hammer2_iocb_t *iocb = bio->bio_caller_info1.ptr;
 692         hammer2_io_t *dio;
 693
 694         dio = iocb->dio;
 695         if ((bio->bio_flags & BIO_DONE) == 0)
 696                 bpdone(dbp, 0);
 697         bio->bio_flags &= ~(BIO_DONE | BIO_SYNC);
 698         dio->bp = bio->bio_buf;
 699         iocb->callback(iocb);
 700 }
 701
 702 void
 703 hammer2_io_bawrite(hammer2_io_t **diop)
 704 {
 705         atomic_set_int(&(*diop)->refs, HAMMER2_DIO_DIRTY);
 706         hammer2_io_putblk(diop);
 707 }
 708
 709 void
 710 hammer2_io_bdwrite(hammer2_io_t **diop)
 711 {
 712         atomic_set_int(&(*diop)->refs, HAMMER2_DIO_DIRTY);
 713         hammer2_io_putblk(diop);
 714 }
 715
 716 int
 717 hammer2_io_bwrite(hammer2_io_t **diop)
 718 {
 719         atomic_set_int(&(*diop)->refs, HAMMER2_DIO_DIRTY);
 720         hammer2_io_putblk(diop);
 721         return (0);     /* XXX */
 722 }
 723
 724 void
 725 hammer2_io_setdirty(hammer2_io_t *dio)
 726 {
 727         atomic_set_int(&dio->refs, HAMMER2_DIO_DIRTY);
 728 }
 729
 730 void
 731 hammer2_io_setinval(hammer2_io_t *dio, u_int bytes)
 732 {
 733         if ((u_int)dio->psize == bytes)
 734                 dio->bp->b_flags |= B_INVAL | B_RELBUF;
 735 }
 736
 737 void
 738 hammer2_io_brelse(hammer2_io_t **diop)
 739 {
 740         hammer2_io_putblk(diop);
 741 }
 742
 743 void
 744 hammer2_io_bqrelse(hammer2_io_t **diop)
 745 {
 746         hammer2_io_putblk(diop);
 747 }
 748
 749 int
 750 hammer2_io_isdirty(hammer2_io_t *dio)
 751 {
 752         return((dio->refs & HAMMER2_DIO_DIRTY) != 0);
 753 }