1 /* 2 * Copyright (c) 2011-2018 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 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org> 7 * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression) 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 3. Neither the name of The DragonFly Project nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific, prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 27 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 /* 37 * This module handles low level logical file I/O (strategy) which backs 38 * the logical buffer cache. 39 * 40 * [De]compression, zero-block, check codes, and buffer cache operations 41 * for file data is handled here. 42 * 43 * Live dedup makes its home here as well. 44 */ 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/fcntl.h> 50 #include <sys/buf.h> 51 #include <sys/proc.h> 52 #include <sys/namei.h> 53 #include <sys/mount.h> 54 #include <sys/vnode.h> 55 #include <sys/mountctl.h> 56 #include <sys/dirent.h> 57 #include <sys/uio.h> 58 #include <sys/objcache.h> 59 #include <sys/event.h> 60 #include <sys/file.h> 61 #include <vfs/fifofs/fifo.h> 62 63 #include "hammer2.h" 64 #include "hammer2_lz4.h" 65 66 #include "zlib/hammer2_zlib.h" 67 68 struct objcache *cache_buffer_read; 69 struct objcache *cache_buffer_write; 70 71 /* 72 * Strategy code (async logical file buffer I/O from system) 73 * 74 * Except for the transaction init (which should normally not block), 75 * we essentially run the strategy operation asynchronously via a XOP. 76 * 77 * WARNING! The XOP deals with buffer synchronization. It is not synchronized 78 * to the current cpu. 79 * 80 * XXX This isn't supposed to be able to deadlock against vfs_sync vfsync() 81 * calls but it has in the past when multiple flushes are queued. 82 * 83 * XXX We currently terminate the transaction once we get a quorum, otherwise 84 * the frontend can stall, but this can leave the remaining nodes with 85 * a potential flush conflict. We need to delay flushes on those nodes 86 * until running transactions complete separately from the normal 87 * transaction sequencing. FIXME TODO. 88 */ 89 static void hammer2_strategy_xop_read(hammer2_thread_t *thr, 90 hammer2_xop_t *arg); 91 static void hammer2_strategy_xop_write(hammer2_thread_t *thr, 92 hammer2_xop_t *arg); 93 static int hammer2_strategy_read(struct vop_strategy_args *ap); 94 static int hammer2_strategy_write(struct vop_strategy_args *ap); 95 static void hammer2_strategy_read_completion(hammer2_chain_t *chain, 96 char *data, struct bio *bio); 97 98 static hammer2_off_t hammer2_dedup_lookup(hammer2_dev_t *hmp, 99 char **datap, int pblksize); 100 101 int 102 hammer2_vop_strategy(struct vop_strategy_args *ap) 103 { 104 struct bio *biop; 105 struct buf *bp; 106 int error; 107 108 biop = ap->a_bio; 109 bp = biop->bio_buf; 110 111 switch(bp->b_cmd) { 112 case BUF_CMD_READ: 113 error = hammer2_strategy_read(ap); 114 ++hammer2_iod_file_read; 115 break; 116 case BUF_CMD_WRITE: 117 error = hammer2_strategy_write(ap); 118 ++hammer2_iod_file_write; 119 break; 120 default: 121 bp->b_error = error = EINVAL; 122 bp->b_flags |= B_ERROR; 123 biodone(biop); 124 break; 125 } 126 return (error); 127 } 128 129 /* 130 * Return the largest contiguous physical disk range for the logical 131 * request, in bytes. 132 * 133 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) 134 * 135 * Basically disabled, the logical buffer write thread has to deal with 136 * buffers one-at-a-time. Note that this should not prevent cluster_read() 137 * from reading-ahead, it simply prevents it from trying form a single 138 * cluster buffer for the logical request. H2 already uses 64KB buffers! 139 */ 140 int 141 hammer2_vop_bmap(struct vop_bmap_args *ap) 142 { 143 *ap->a_doffsetp = NOOFFSET; 144 if (ap->a_runp) 145 *ap->a_runp = 0; 146 if (ap->a_runb) 147 *ap->a_runb = 0; 148 return (EOPNOTSUPP); 149 } 150 151 /**************************************************************************** 152 * READ SUPPORT * 153 ****************************************************************************/ 154 /* 155 * Callback used in read path in case that a block is compressed with LZ4. 156 */ 157 static 158 void 159 hammer2_decompress_LZ4_callback(const char *data, u_int bytes, struct bio *bio) 160 { 161 struct buf *bp; 162 char *compressed_buffer; 163 int compressed_size; 164 int result; 165 166 bp = bio->bio_buf; 167 168 #if 0 169 if bio->bio_caller_info2.index && 170 bio->bio_caller_info1.uvalue32 != 171 crc32(bp->b_data, bp->b_bufsize) --- return error 172 #endif 173 174 KKASSERT(bp->b_bufsize <= HAMMER2_PBUFSIZE); 175 compressed_size = *(const int *)data; 176 KKASSERT((uint32_t)compressed_size <= bytes - sizeof(int)); 177 178 compressed_buffer = objcache_get(cache_buffer_read, M_INTWAIT); 179 result = LZ4_decompress_safe(__DECONST(char *, &data[sizeof(int)]), 180 compressed_buffer, 181 compressed_size, 182 bp->b_bufsize); 183 if (result < 0) { 184 kprintf("READ PATH: Error during decompression." 185 "bio %016jx/%d\n", 186 (intmax_t)bio->bio_offset, bytes); 187 /* make sure it isn't random garbage */ 188 bzero(compressed_buffer, bp->b_bufsize); 189 } 190 KKASSERT(result <= bp->b_bufsize); 191 bcopy(compressed_buffer, bp->b_data, bp->b_bufsize); 192 if (result < bp->b_bufsize) 193 bzero(bp->b_data + result, bp->b_bufsize - result); 194 objcache_put(cache_buffer_read, compressed_buffer); 195 bp->b_resid = 0; 196 bp->b_flags |= B_AGE; 197 } 198 199 /* 200 * Callback used in read path in case that a block is compressed with ZLIB. 201 * It is almost identical to LZ4 callback, so in theory they can be unified, 202 * but we didn't want to make changes in bio structure for that. 203 */ 204 static 205 void 206 hammer2_decompress_ZLIB_callback(const char *data, u_int bytes, struct bio *bio) 207 { 208 struct buf *bp; 209 char *compressed_buffer; 210 z_stream strm_decompress; 211 int result; 212 int ret; 213 214 bp = bio->bio_buf; 215 216 KKASSERT(bp->b_bufsize <= HAMMER2_PBUFSIZE); 217 strm_decompress.avail_in = 0; 218 strm_decompress.next_in = Z_NULL; 219 220 ret = inflateInit(&strm_decompress); 221 222 if (ret != Z_OK) 223 kprintf("HAMMER2 ZLIB: Fatal error in inflateInit.\n"); 224 225 compressed_buffer = objcache_get(cache_buffer_read, M_INTWAIT); 226 strm_decompress.next_in = __DECONST(char *, data); 227 228 /* XXX supply proper size, subset of device bp */ 229 strm_decompress.avail_in = bytes; 230 strm_decompress.next_out = compressed_buffer; 231 strm_decompress.avail_out = bp->b_bufsize; 232 233 ret = inflate(&strm_decompress, Z_FINISH); 234 if (ret != Z_STREAM_END) { 235 kprintf("HAMMER2 ZLIB: Fatar error during decompression.\n"); 236 bzero(compressed_buffer, bp->b_bufsize); 237 } 238 bcopy(compressed_buffer, bp->b_data, bp->b_bufsize); 239 result = bp->b_bufsize - strm_decompress.avail_out; 240 if (result < bp->b_bufsize) 241 bzero(bp->b_data + result, strm_decompress.avail_out); 242 objcache_put(cache_buffer_read, compressed_buffer); 243 ret = inflateEnd(&strm_decompress); 244 245 bp->b_resid = 0; 246 bp->b_flags |= B_AGE; 247 } 248 249 /* 250 * Logical buffer I/O, async read. 251 */ 252 static 253 int 254 hammer2_strategy_read(struct vop_strategy_args *ap) 255 { 256 hammer2_xop_strategy_t *xop; 257 struct buf *bp; 258 struct bio *bio; 259 struct bio *nbio; 260 hammer2_inode_t *ip; 261 hammer2_key_t lbase; 262 263 bio = ap->a_bio; 264 bp = bio->bio_buf; 265 ip = VTOI(ap->a_vp); 266 nbio = push_bio(bio); 267 268 lbase = bio->bio_offset; 269 KKASSERT(((int)lbase & HAMMER2_PBUFMASK) == 0); 270 271 xop = hammer2_xop_alloc(ip, HAMMER2_XOP_STRATEGY); 272 xop->finished = 0; 273 xop->bio = bio; 274 xop->lbase = lbase; 275 hammer2_mtx_init(&xop->lock, "h2bior"); 276 hammer2_xop_start(&xop->head, hammer2_strategy_xop_read); 277 /* asynchronous completion */ 278 279 return(0); 280 } 281 282 /* 283 * Per-node XOP (threaded), do a synchronous lookup of the chain and 284 * its data. The frontend is asynchronous, so we are also responsible 285 * for racing to terminate the frontend. 286 */ 287 static 288 void 289 hammer2_strategy_xop_read(hammer2_thread_t *thr, hammer2_xop_t *arg) 290 { 291 hammer2_xop_strategy_t *xop = &arg->xop_strategy; 292 hammer2_chain_t *parent; 293 hammer2_chain_t *chain; 294 hammer2_key_t key_dummy; 295 hammer2_key_t lbase; 296 struct bio *bio; 297 struct buf *bp; 298 int error; 299 300 /* 301 * Note that we can race completion of the bio supplied by 302 * the front-end so we cannot access it until we determine 303 * that we are the ones finishing it up. 304 */ 305 lbase = xop->lbase; 306 307 /* 308 * This is difficult to optimize. The logical buffer might be 309 * partially dirty (contain dummy zero-fill pages), which would 310 * mess up our crc calculation if we were to try a direct read. 311 * So for now we always double-buffer through the underlying 312 * storage. 313 * 314 * If not for the above problem we could conditionalize on 315 * (1) 64KB buffer, (2) one chain (not multi-master) and 316 * (3) !hammer2_double_buffer, and issue a direct read into the 317 * logical buffer. 318 */ 319 parent = hammer2_inode_chain(xop->head.ip1, thr->clindex, 320 HAMMER2_RESOLVE_ALWAYS | 321 HAMMER2_RESOLVE_SHARED); 322 if (parent) { 323 chain = hammer2_chain_lookup(&parent, &key_dummy, 324 lbase, lbase, 325 &error, 326 HAMMER2_LOOKUP_ALWAYS | 327 HAMMER2_LOOKUP_SHARED); 328 if (chain) 329 error = chain->error; 330 } else { 331 error = HAMMER2_ERROR_EIO; 332 chain = NULL; 333 } 334 error = hammer2_xop_feed(&xop->head, chain, thr->clindex, error); 335 if (chain) { 336 hammer2_chain_unlock(chain); 337 hammer2_chain_drop(chain); 338 } 339 if (parent) { 340 hammer2_chain_unlock(parent); 341 hammer2_chain_drop(parent); 342 } 343 chain = NULL; /* safety */ 344 parent = NULL; /* safety */ 345 346 /* 347 * Race to finish the frontend. First-to-complete. bio is only 348 * valid if we are determined to be the ones able to complete 349 * the operation. 350 */ 351 if (xop->finished) 352 return; 353 hammer2_mtx_ex(&xop->lock); 354 if (xop->finished) { 355 hammer2_mtx_unlock(&xop->lock); 356 return; 357 } 358 bio = xop->bio; 359 bp = bio->bio_buf; 360 bkvasync(bp); 361 362 /* 363 * Async operation has not completed and we now own the lock. 364 * Determine if we can complete the operation by issuing the 365 * frontend collection non-blocking. 366 * 367 * H2 double-buffers the data, setting B_NOTMETA on the logical 368 * buffer hints to the OS that the logical buffer should not be 369 * swapcached (since the device buffer can be). 370 * 371 * Also note that even for compressed data we would rather the 372 * kernel cache/swapcache device buffers more and (decompressed) 373 * logical buffers less, since that will significantly improve 374 * the amount of end-user data that can be cached. 375 * 376 * NOTE: The chain->data for xop->head.cluster.focus will be 377 * synchronized to the current cpu by xop_collect(), 378 * but other chains in the cluster might not be. 379 */ 380 error = hammer2_xop_collect(&xop->head, HAMMER2_XOP_COLLECT_NOWAIT); 381 382 switch(error) { 383 case 0: 384 xop->finished = 1; 385 hammer2_mtx_unlock(&xop->lock); 386 bp->b_flags |= B_NOTMETA; 387 chain = xop->head.cluster.focus; 388 hammer2_strategy_read_completion(chain, (char *)chain->data, 389 xop->bio); 390 biodone(bio); 391 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 392 break; 393 case HAMMER2_ERROR_ENOENT: 394 xop->finished = 1; 395 hammer2_mtx_unlock(&xop->lock); 396 bp->b_flags |= B_NOTMETA; 397 bp->b_resid = 0; 398 bp->b_error = 0; 399 bzero(bp->b_data, bp->b_bcount); 400 biodone(bio); 401 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 402 break; 403 case HAMMER2_ERROR_EINPROGRESS: 404 hammer2_mtx_unlock(&xop->lock); 405 break; 406 default: 407 kprintf("strategy_xop_read: error %08x loff=%016jx\n", 408 error, bp->b_loffset); 409 xop->finished = 1; 410 hammer2_mtx_unlock(&xop->lock); 411 bp->b_flags |= B_ERROR; 412 bp->b_error = EIO; 413 biodone(bio); 414 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 415 break; 416 } 417 } 418 419 static 420 void 421 hammer2_strategy_read_completion(hammer2_chain_t *chain, char *data, 422 struct bio *bio) 423 { 424 struct buf *bp = bio->bio_buf; 425 426 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE) { 427 /* 428 * Copy from in-memory inode structure. 429 */ 430 bcopy(((hammer2_inode_data_t *)data)->u.data, 431 bp->b_data, HAMMER2_EMBEDDED_BYTES); 432 bzero(bp->b_data + HAMMER2_EMBEDDED_BYTES, 433 bp->b_bcount - HAMMER2_EMBEDDED_BYTES); 434 bp->b_resid = 0; 435 bp->b_error = 0; 436 } else if (chain->bref.type == HAMMER2_BREF_TYPE_DATA) { 437 /* 438 * Data is on-media, record for live dedup. Release the 439 * chain (try to free it) when done. The data is still 440 * cached by both the buffer cache in front and the 441 * block device behind us. This leaves more room in the 442 * LRU chain cache for meta-data chains which we really 443 * want to retain. 444 * 445 * NOTE: Deduplication cannot be safely recorded for 446 * records without a check code. 447 */ 448 hammer2_dedup_record(chain, NULL, data); 449 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 450 451 /* 452 * Decompression and copy. 453 */ 454 switch (HAMMER2_DEC_COMP(chain->bref.methods)) { 455 case HAMMER2_COMP_LZ4: 456 hammer2_decompress_LZ4_callback(data, chain->bytes, 457 bio); 458 /* b_resid set by call */ 459 break; 460 case HAMMER2_COMP_ZLIB: 461 hammer2_decompress_ZLIB_callback(data, chain->bytes, 462 bio); 463 /* b_resid set by call */ 464 break; 465 case HAMMER2_COMP_NONE: 466 KKASSERT(chain->bytes <= bp->b_bcount); 467 bcopy(data, bp->b_data, chain->bytes); 468 if (chain->bytes < bp->b_bcount) { 469 bzero(bp->b_data + chain->bytes, 470 bp->b_bcount - chain->bytes); 471 } 472 bp->b_resid = 0; 473 bp->b_error = 0; 474 break; 475 default: 476 panic("hammer2_strategy_read: " 477 "unknown compression type"); 478 } 479 } else { 480 panic("hammer2_strategy_read: unknown bref type"); 481 } 482 } 483 484 /**************************************************************************** 485 * WRITE SUPPORT * 486 ****************************************************************************/ 487 488 /* 489 * Functions for compression in threads, 490 * from hammer2_vnops.c 491 */ 492 static void hammer2_write_file_core(char *data, hammer2_inode_t *ip, 493 hammer2_chain_t **parentp, 494 hammer2_key_t lbase, int ioflag, int pblksize, 495 hammer2_tid_t mtid, int *errorp); 496 static void hammer2_compress_and_write(char *data, hammer2_inode_t *ip, 497 hammer2_chain_t **parentp, 498 hammer2_key_t lbase, int ioflag, int pblksize, 499 hammer2_tid_t mtid, int *errorp, 500 int comp_algo, int check_algo); 501 static void hammer2_zero_check_and_write(char *data, hammer2_inode_t *ip, 502 hammer2_chain_t **parentp, 503 hammer2_key_t lbase, int ioflag, int pblksize, 504 hammer2_tid_t mtid, int *errorp, 505 int check_algo); 506 static int test_block_zeros(const char *buf, size_t bytes); 507 static void zero_write(char *data, hammer2_inode_t *ip, 508 hammer2_chain_t **parentp, 509 hammer2_key_t lbase, 510 hammer2_tid_t mtid, int *errorp); 511 static void hammer2_write_bp(hammer2_chain_t *chain, char *data, 512 int ioflag, int pblksize, 513 hammer2_tid_t mtid, int *errorp, 514 int check_algo); 515 516 static 517 int 518 hammer2_strategy_write(struct vop_strategy_args *ap) 519 { 520 hammer2_xop_strategy_t *xop; 521 hammer2_pfs_t *pmp; 522 struct bio *bio; 523 struct buf *bp; 524 hammer2_inode_t *ip; 525 526 bio = ap->a_bio; 527 bp = bio->bio_buf; 528 ip = VTOI(ap->a_vp); 529 pmp = ip->pmp; 530 531 atomic_set_int(&ip->flags, HAMMER2_INODE_DIRTYDATA); 532 hammer2_lwinprog_ref(pmp); 533 hammer2_trans_assert_strategy(pmp); 534 hammer2_trans_init(pmp, HAMMER2_TRANS_BUFCACHE); 535 536 xop = hammer2_xop_alloc(ip, HAMMER2_XOP_MODIFYING | 537 HAMMER2_XOP_STRATEGY); 538 xop->finished = 0; 539 xop->bio = bio; 540 xop->lbase = bio->bio_offset; 541 hammer2_mtx_init(&xop->lock, "h2biow"); 542 hammer2_xop_start(&xop->head, hammer2_strategy_xop_write); 543 /* asynchronous completion */ 544 545 hammer2_lwinprog_wait(pmp, hammer2_flush_pipe); 546 547 return(0); 548 } 549 550 /* 551 * Per-node XOP (threaded). Write the logical buffer to the media. 552 * 553 * This is a bit problematic because there may be multiple target and 554 * any of them may be able to release the bp. In addition, if our 555 * particulr target is offline we don't want to block the bp (and thus 556 * the frontend). To accomplish this we copy the data to the per-thr 557 * scratch buffer. 558 */ 559 static 560 void 561 hammer2_strategy_xop_write(hammer2_thread_t *thr, hammer2_xop_t *arg) 562 { 563 hammer2_xop_strategy_t *xop = &arg->xop_strategy; 564 hammer2_chain_t *parent; 565 hammer2_key_t lbase; 566 hammer2_inode_t *ip; 567 struct bio *bio; 568 struct buf *bp; 569 int error; 570 int lblksize; 571 int pblksize; 572 hammer2_off_t bio_offset; 573 char *bio_data; 574 575 /* 576 * We can only access the bp/bio if the frontend has not yet 577 * completed. 578 */ 579 if (xop->finished) 580 return; 581 hammer2_mtx_sh(&xop->lock); 582 if (xop->finished) { 583 hammer2_mtx_unlock(&xop->lock); 584 return; 585 } 586 587 lbase = xop->lbase; 588 bio = xop->bio; /* ephermal */ 589 bp = bio->bio_buf; /* ephermal */ 590 ip = xop->head.ip1; /* retained by ref */ 591 bio_offset = bio->bio_offset; 592 bio_data = thr->scratch; 593 594 /* hammer2_trans_init(parent->hmp->spmp, HAMMER2_TRANS_BUFCACHE); */ 595 596 lblksize = hammer2_calc_logical(ip, bio->bio_offset, &lbase, NULL); 597 pblksize = hammer2_calc_physical(ip, lbase); 598 bkvasync(bp); 599 KKASSERT(lblksize <= MAXPHYS); 600 bcopy(bp->b_data, bio_data, lblksize); 601 602 hammer2_mtx_unlock(&xop->lock); 603 bp = NULL; /* safety, illegal to access after unlock */ 604 bio = NULL; /* safety, illegal to access after unlock */ 605 606 /* 607 * Actual operation 608 */ 609 parent = hammer2_inode_chain(ip, thr->clindex, HAMMER2_RESOLVE_ALWAYS); 610 hammer2_write_file_core(bio_data, ip, &parent, 611 lbase, IO_ASYNC, pblksize, 612 xop->head.mtid, &error); 613 if (parent) { 614 hammer2_chain_unlock(parent); 615 hammer2_chain_drop(parent); 616 parent = NULL; /* safety */ 617 } 618 hammer2_xop_feed(&xop->head, NULL, thr->clindex, error); 619 620 /* 621 * Try to complete the operation on behalf of the front-end. 622 */ 623 if (xop->finished) 624 return; 625 hammer2_mtx_ex(&xop->lock); 626 if (xop->finished) { 627 hammer2_mtx_unlock(&xop->lock); 628 return; 629 } 630 631 /* 632 * Async operation has not completed and we now own the lock. 633 * Determine if we can complete the operation by issuing the 634 * frontend collection non-blocking. 635 * 636 * H2 double-buffers the data, setting B_NOTMETA on the logical 637 * buffer hints to the OS that the logical buffer should not be 638 * swapcached (since the device buffer can be). 639 */ 640 error = hammer2_xop_collect(&xop->head, HAMMER2_XOP_COLLECT_NOWAIT); 641 642 if (error == HAMMER2_ERROR_EINPROGRESS) { 643 hammer2_mtx_unlock(&xop->lock); 644 return; 645 } 646 647 /* 648 * Async operation has completed. 649 */ 650 xop->finished = 1; 651 hammer2_mtx_unlock(&xop->lock); 652 653 bio = xop->bio; /* now owned by us */ 654 bp = bio->bio_buf; /* now owned by us */ 655 656 if (error == HAMMER2_ERROR_ENOENT || error == 0) { 657 bp->b_flags |= B_NOTMETA; 658 bp->b_resid = 0; 659 bp->b_error = 0; 660 biodone(bio); 661 } else { 662 kprintf("strategy_xop_write: error %d loff=%016jx\n", 663 error, bp->b_loffset); 664 bp->b_flags |= B_ERROR; 665 bp->b_error = EIO; 666 biodone(bio); 667 } 668 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 669 hammer2_trans_assert_strategy(ip->pmp); 670 hammer2_lwinprog_drop(ip->pmp); 671 hammer2_trans_done(ip->pmp); 672 } 673 674 /* 675 * Wait for pending I/O to complete 676 */ 677 void 678 hammer2_bioq_sync(hammer2_pfs_t *pmp) 679 { 680 hammer2_lwinprog_wait(pmp, 0); 681 } 682 683 /* 684 * Assign physical storage at (cparent, lbase), returning a suitable chain 685 * and setting *errorp appropriately. 686 * 687 * If no error occurs, the returned chain will be in a modified state. 688 * 689 * If an error occurs, the returned chain may or may not be NULL. If 690 * not-null any chain->error (if not 0) will also be rolled up into *errorp. 691 * So the caller only needs to test *errorp. 692 * 693 * cparent can wind up being anything. 694 * 695 * If datap is not NULL, *datap points to the real data we intend to write. 696 * If we can dedup the storage location we set *datap to NULL to indicate 697 * to the caller that a dedup occurred. 698 * 699 * NOTE: Special case for data embedded in inode. 700 */ 701 static 702 hammer2_chain_t * 703 hammer2_assign_physical(hammer2_inode_t *ip, hammer2_chain_t **parentp, 704 hammer2_key_t lbase, int pblksize, 705 hammer2_tid_t mtid, char **datap, int *errorp) 706 { 707 hammer2_chain_t *chain; 708 hammer2_key_t key_dummy; 709 hammer2_off_t dedup_off; 710 int pradix = hammer2_getradix(pblksize); 711 712 /* 713 * Locate the chain associated with lbase, return a locked chain. 714 * However, do not instantiate any data reference (which utilizes a 715 * device buffer) because we will be using direct IO via the 716 * logical buffer cache buffer. 717 */ 718 KKASSERT(pblksize >= HAMMER2_ALLOC_MIN); 719 720 chain = hammer2_chain_lookup(parentp, &key_dummy, 721 lbase, lbase, 722 errorp, 723 HAMMER2_LOOKUP_NODATA); 724 725 /* 726 * The lookup code should not return a DELETED chain to us, unless 727 * its a short-file embedded in the inode. Then it is possible for 728 * the lookup to return a deleted inode. 729 */ 730 if (chain && (chain->flags & HAMMER2_CHAIN_DELETED) && 731 chain->bref.type != HAMMER2_BREF_TYPE_INODE) { 732 kprintf("assign physical deleted chain @ " 733 "%016jx (%016jx.%02x) ip %016jx\n", 734 lbase, chain->bref.data_off, chain->bref.type, 735 ip->meta.inum); 736 Debugger("bleh"); 737 } 738 739 if (chain == NULL) { 740 /* 741 * We found a hole, create a new chain entry. 742 * 743 * NOTE: DATA chains are created without device backing 744 * store (nor do we want any). 745 */ 746 dedup_off = hammer2_dedup_lookup((*parentp)->hmp, datap, 747 pblksize); 748 *errorp |= hammer2_chain_create(parentp, &chain, 749 ip->pmp, 750 HAMMER2_ENC_CHECK(ip->meta.check_algo) | 751 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE), 752 lbase, HAMMER2_PBUFRADIX, 753 HAMMER2_BREF_TYPE_DATA, 754 pblksize, mtid, 755 dedup_off, 0); 756 if (chain == NULL) 757 goto failed; 758 /*ip->delta_dcount += pblksize;*/ 759 } else if (chain->error == 0) { 760 switch (chain->bref.type) { 761 case HAMMER2_BREF_TYPE_INODE: 762 /* 763 * The data is embedded in the inode, which requires 764 * a bit more finess. 765 */ 766 *errorp |= hammer2_chain_modify_ip(ip, chain, mtid, 0); 767 break; 768 case HAMMER2_BREF_TYPE_DATA: 769 dedup_off = hammer2_dedup_lookup(chain->hmp, datap, 770 pblksize); 771 if (chain->bytes != pblksize) { 772 *errorp |= hammer2_chain_resize(chain, 773 mtid, dedup_off, 774 pradix, 775 HAMMER2_MODIFY_OPTDATA); 776 if (*errorp) 777 break; 778 } 779 780 /* 781 * DATA buffers must be marked modified whether the 782 * data is in a logical buffer or not. We also have 783 * to make this call to fixup the chain data pointers 784 * after resizing in case this is an encrypted or 785 * compressed buffer. 786 */ 787 *errorp |= hammer2_chain_modify(chain, mtid, dedup_off, 788 HAMMER2_MODIFY_OPTDATA); 789 break; 790 default: 791 panic("hammer2_assign_physical: bad type"); 792 /* NOT REACHED */ 793 break; 794 } 795 } else { 796 *errorp = chain->error; 797 } 798 atomic_set_int(&ip->flags, HAMMER2_INODE_DIRTYDATA); 799 failed: 800 return (chain); 801 } 802 803 /* 804 * hammer2_write_file_core() - hammer2_write_thread() helper 805 * 806 * The core write function which determines which path to take 807 * depending on compression settings. We also have to locate the 808 * related chains so we can calculate and set the check data for 809 * the blockref. 810 */ 811 static 812 void 813 hammer2_write_file_core(char *data, hammer2_inode_t *ip, 814 hammer2_chain_t **parentp, 815 hammer2_key_t lbase, int ioflag, int pblksize, 816 hammer2_tid_t mtid, int *errorp) 817 { 818 hammer2_chain_t *chain; 819 char *bdata; 820 821 *errorp = 0; 822 823 switch(HAMMER2_DEC_ALGO(ip->meta.comp_algo)) { 824 case HAMMER2_COMP_NONE: 825 /* 826 * We have to assign physical storage to the buffer 827 * we intend to dirty or write now to avoid deadlocks 828 * in the strategy code later. 829 * 830 * This can return NOOFFSET for inode-embedded data. 831 * The strategy code will take care of it in that case. 832 */ 833 bdata = data; 834 chain = hammer2_assign_physical(ip, parentp, lbase, pblksize, 835 mtid, &bdata, errorp); 836 if (*errorp) { 837 /* skip modifications */ 838 } else if (chain->bref.type == HAMMER2_BREF_TYPE_INODE) { 839 hammer2_inode_data_t *wipdata; 840 841 wipdata = &chain->data->ipdata; 842 KKASSERT(wipdata->meta.op_flags & 843 HAMMER2_OPFLAG_DIRECTDATA); 844 bcopy(data, wipdata->u.data, HAMMER2_EMBEDDED_BYTES); 845 ++hammer2_iod_file_wembed; 846 } else if (bdata == NULL) { 847 /* 848 * Copy of data already present on-media. 849 */ 850 chain->bref.methods = 851 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE) + 852 HAMMER2_ENC_CHECK(ip->meta.check_algo); 853 hammer2_chain_setcheck(chain, data); 854 } else { 855 hammer2_write_bp(chain, data, ioflag, pblksize, 856 mtid, errorp, ip->meta.check_algo); 857 } 858 if (chain) { 859 hammer2_chain_unlock(chain); 860 hammer2_chain_drop(chain); 861 } 862 break; 863 case HAMMER2_COMP_AUTOZERO: 864 /* 865 * Check for zero-fill only 866 */ 867 hammer2_zero_check_and_write(data, ip, parentp, 868 lbase, ioflag, pblksize, 869 mtid, errorp, 870 ip->meta.check_algo); 871 break; 872 case HAMMER2_COMP_LZ4: 873 case HAMMER2_COMP_ZLIB: 874 default: 875 /* 876 * Check for zero-fill and attempt compression. 877 */ 878 hammer2_compress_and_write(data, ip, parentp, 879 lbase, ioflag, pblksize, 880 mtid, errorp, 881 ip->meta.comp_algo, 882 ip->meta.check_algo); 883 break; 884 } 885 } 886 887 /* 888 * Helper 889 * 890 * Generic function that will perform the compression in compression 891 * write path. The compression algorithm is determined by the settings 892 * obtained from inode. 893 */ 894 static 895 void 896 hammer2_compress_and_write(char *data, hammer2_inode_t *ip, 897 hammer2_chain_t **parentp, 898 hammer2_key_t lbase, int ioflag, int pblksize, 899 hammer2_tid_t mtid, int *errorp, int comp_algo, int check_algo) 900 { 901 hammer2_chain_t *chain; 902 int comp_size; 903 int comp_block_size; 904 char *comp_buffer; 905 char *bdata; 906 907 /* 908 * An all-zeros write creates a hole unless the check code 909 * is disabled. When the check code is disabled all writes 910 * are done in-place, including any all-zeros writes. 911 * 912 * NOTE: A snapshot will still force a copy-on-write 913 * (see the HAMMER2_CHECK_NONE in hammer2_chain.c). 914 */ 915 if (check_algo != HAMMER2_CHECK_NONE && 916 test_block_zeros(data, pblksize)) { 917 zero_write(data, ip, parentp, lbase, mtid, errorp); 918 return; 919 } 920 921 /* 922 * Compression requested. Try to compress the block. We store 923 * the data normally if we cannot sufficiently compress it. 924 * 925 * We have a heuristic to detect files which are mostly 926 * uncompressable and avoid the compression attempt in that 927 * case. If the compression heuristic is turned off, we always 928 * try to compress. 929 */ 930 comp_size = 0; 931 comp_buffer = NULL; 932 933 KKASSERT(pblksize / 2 <= 32768); 934 935 if (ip->comp_heuristic < 8 || (ip->comp_heuristic & 7) == 0 || 936 hammer2_always_compress) { 937 z_stream strm_compress; 938 int comp_level; 939 int ret; 940 941 switch(HAMMER2_DEC_ALGO(comp_algo)) { 942 case HAMMER2_COMP_LZ4: 943 /* 944 * We need to prefix with the size, LZ4 945 * doesn't do it for us. Add the related 946 * overhead. 947 * 948 * NOTE: The LZ4 code seems to assume at least an 949 * 8-byte buffer size granularity and may 950 * overrun the buffer if given a 4-byte 951 * granularity. 952 */ 953 comp_buffer = objcache_get(cache_buffer_write, 954 M_INTWAIT); 955 comp_size = LZ4_compress_limitedOutput( 956 data, 957 &comp_buffer[sizeof(int)], 958 pblksize, 959 pblksize / 2 - sizeof(int64_t)); 960 *(int *)comp_buffer = comp_size; 961 if (comp_size) 962 comp_size += sizeof(int); 963 break; 964 case HAMMER2_COMP_ZLIB: 965 comp_level = HAMMER2_DEC_LEVEL(comp_algo); 966 if (comp_level == 0) 967 comp_level = 6; /* default zlib compression */ 968 else if (comp_level < 6) 969 comp_level = 6; 970 else if (comp_level > 9) 971 comp_level = 9; 972 ret = deflateInit(&strm_compress, comp_level); 973 if (ret != Z_OK) { 974 kprintf("HAMMER2 ZLIB: fatal error " 975 "on deflateInit.\n"); 976 } 977 978 comp_buffer = objcache_get(cache_buffer_write, 979 M_INTWAIT); 980 strm_compress.next_in = data; 981 strm_compress.avail_in = pblksize; 982 strm_compress.next_out = comp_buffer; 983 strm_compress.avail_out = pblksize / 2; 984 ret = deflate(&strm_compress, Z_FINISH); 985 if (ret == Z_STREAM_END) { 986 comp_size = pblksize / 2 - 987 strm_compress.avail_out; 988 } else { 989 comp_size = 0; 990 } 991 ret = deflateEnd(&strm_compress); 992 break; 993 default: 994 kprintf("Error: Unknown compression method.\n"); 995 kprintf("Comp_method = %d.\n", comp_algo); 996 break; 997 } 998 } 999 1000 if (comp_size == 0) { 1001 /* 1002 * compression failed or turned off 1003 */ 1004 comp_block_size = pblksize; /* safety */ 1005 if (++ip->comp_heuristic > 128) 1006 ip->comp_heuristic = 8; 1007 } else { 1008 /* 1009 * compression succeeded 1010 */ 1011 ip->comp_heuristic = 0; 1012 if (comp_size <= 1024) { 1013 comp_block_size = 1024; 1014 } else if (comp_size <= 2048) { 1015 comp_block_size = 2048; 1016 } else if (comp_size <= 4096) { 1017 comp_block_size = 4096; 1018 } else if (comp_size <= 8192) { 1019 comp_block_size = 8192; 1020 } else if (comp_size <= 16384) { 1021 comp_block_size = 16384; 1022 } else if (comp_size <= 32768) { 1023 comp_block_size = 32768; 1024 } else { 1025 panic("hammer2: WRITE PATH: " 1026 "Weird comp_size value."); 1027 /* NOT REACHED */ 1028 comp_block_size = pblksize; 1029 } 1030 1031 /* 1032 * Must zero the remainder or dedup (which operates on a 1033 * physical block basis) will not find matches. 1034 */ 1035 if (comp_size < comp_block_size) { 1036 bzero(comp_buffer + comp_size, 1037 comp_block_size - comp_size); 1038 } 1039 } 1040 1041 /* 1042 * Assign physical storage, data will be set to NULL if a live-dedup 1043 * was successful. 1044 */ 1045 bdata = comp_size ? comp_buffer : data; 1046 chain = hammer2_assign_physical(ip, parentp, lbase, comp_block_size, 1047 mtid, &bdata, errorp); 1048 1049 if (*errorp) { 1050 goto done; 1051 } 1052 1053 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE) { 1054 hammer2_inode_data_t *wipdata; 1055 1056 *errorp = hammer2_chain_modify_ip(ip, chain, mtid, 0); 1057 if (*errorp == 0) { 1058 wipdata = &chain->data->ipdata; 1059 KKASSERT(wipdata->meta.op_flags & 1060 HAMMER2_OPFLAG_DIRECTDATA); 1061 bcopy(data, wipdata->u.data, HAMMER2_EMBEDDED_BYTES); 1062 ++hammer2_iod_file_wembed; 1063 } 1064 } else if (bdata == NULL) { 1065 /* 1066 * Live deduplication, a copy of the data is already present 1067 * on the media. 1068 */ 1069 if (comp_size) { 1070 chain->bref.methods = 1071 HAMMER2_ENC_COMP(comp_algo) + 1072 HAMMER2_ENC_CHECK(check_algo); 1073 } else { 1074 chain->bref.methods = 1075 HAMMER2_ENC_COMP( 1076 HAMMER2_COMP_NONE) + 1077 HAMMER2_ENC_CHECK(check_algo); 1078 } 1079 bdata = comp_size ? comp_buffer : data; 1080 hammer2_chain_setcheck(chain, bdata); 1081 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL); 1082 } else { 1083 hammer2_io_t *dio; 1084 1085 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED); 1086 1087 switch(chain->bref.type) { 1088 case HAMMER2_BREF_TYPE_INODE: 1089 panic("hammer2_write_bp: unexpected inode\n"); 1090 break; 1091 case HAMMER2_BREF_TYPE_DATA: 1092 /* 1093 * Optimize out the read-before-write 1094 * if possible. 1095 */ 1096 *errorp = hammer2_io_newnz(chain->hmp, 1097 chain->bref.type, 1098 chain->bref.data_off, 1099 chain->bytes, 1100 &dio); 1101 if (*errorp) { 1102 hammer2_io_brelse(&dio); 1103 kprintf("hammer2: WRITE PATH: " 1104 "dbp bread error\n"); 1105 break; 1106 } 1107 bdata = hammer2_io_data(dio, chain->bref.data_off); 1108 1109 /* 1110 * When loading the block make sure we don't 1111 * leave garbage after the compressed data. 1112 */ 1113 if (comp_size) { 1114 chain->bref.methods = 1115 HAMMER2_ENC_COMP(comp_algo) + 1116 HAMMER2_ENC_CHECK(check_algo); 1117 bcopy(comp_buffer, bdata, comp_size); 1118 } else { 1119 chain->bref.methods = 1120 HAMMER2_ENC_COMP( 1121 HAMMER2_COMP_NONE) + 1122 HAMMER2_ENC_CHECK(check_algo); 1123 bcopy(data, bdata, pblksize); 1124 } 1125 1126 /* 1127 * The flush code doesn't calculate check codes for 1128 * file data (doing so can result in excessive I/O), 1129 * so we do it here. 1130 */ 1131 hammer2_chain_setcheck(chain, bdata); 1132 1133 /* 1134 * Device buffer is now valid, chain is no longer in 1135 * the initial state. 1136 * 1137 * (No blockref table worries with file data) 1138 */ 1139 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL); 1140 hammer2_dedup_record(chain, dio, bdata); 1141 1142 /* Now write the related bdp. */ 1143 if (ioflag & IO_SYNC) { 1144 /* 1145 * Synchronous I/O requested. 1146 */ 1147 hammer2_io_bwrite(&dio); 1148 /* 1149 } else if ((ioflag & IO_DIRECT) && 1150 loff + n == pblksize) { 1151 hammer2_io_bdwrite(&dio); 1152 */ 1153 } else if (ioflag & IO_ASYNC) { 1154 hammer2_io_bawrite(&dio); 1155 } else { 1156 hammer2_io_bdwrite(&dio); 1157 } 1158 break; 1159 default: 1160 panic("hammer2_write_bp: bad chain type %d\n", 1161 chain->bref.type); 1162 /* NOT REACHED */ 1163 break; 1164 } 1165 } 1166 done: 1167 if (chain) { 1168 hammer2_chain_unlock(chain); 1169 hammer2_chain_drop(chain); 1170 } 1171 if (comp_buffer) 1172 objcache_put(cache_buffer_write, comp_buffer); 1173 } 1174 1175 /* 1176 * Helper 1177 * 1178 * Function that performs zero-checking and writing without compression, 1179 * it corresponds to default zero-checking path. 1180 */ 1181 static 1182 void 1183 hammer2_zero_check_and_write(char *data, hammer2_inode_t *ip, 1184 hammer2_chain_t **parentp, 1185 hammer2_key_t lbase, int ioflag, int pblksize, 1186 hammer2_tid_t mtid, int *errorp, 1187 int check_algo) 1188 { 1189 hammer2_chain_t *chain; 1190 char *bdata; 1191 1192 if (check_algo != HAMMER2_CHECK_NONE && 1193 test_block_zeros(data, pblksize)) { 1194 /* 1195 * An all-zeros write creates a hole unless the check code 1196 * is disabled. When the check code is disabled all writes 1197 * are done in-place, including any all-zeros writes. 1198 * 1199 * NOTE: A snapshot will still force a copy-on-write 1200 * (see the HAMMER2_CHECK_NONE in hammer2_chain.c). 1201 */ 1202 zero_write(data, ip, parentp, lbase, mtid, errorp); 1203 } else { 1204 /* 1205 * Normal write 1206 */ 1207 bdata = data; 1208 chain = hammer2_assign_physical(ip, parentp, lbase, pblksize, 1209 mtid, &bdata, errorp); 1210 if (*errorp) { 1211 /* do nothing */ 1212 } else if (bdata) { 1213 hammer2_write_bp(chain, data, ioflag, pblksize, 1214 mtid, errorp, check_algo); 1215 } else { 1216 /* dedup occurred */ 1217 chain->bref.methods = 1218 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE) + 1219 HAMMER2_ENC_CHECK(check_algo); 1220 hammer2_chain_setcheck(chain, data); 1221 } 1222 if (chain) { 1223 hammer2_chain_unlock(chain); 1224 hammer2_chain_drop(chain); 1225 } 1226 } 1227 } 1228 1229 /* 1230 * Helper 1231 * 1232 * A function to test whether a block of data contains only zeros, 1233 * returns TRUE (non-zero) if the block is all zeros. 1234 */ 1235 static 1236 int 1237 test_block_zeros(const char *buf, size_t bytes) 1238 { 1239 size_t i; 1240 1241 for (i = 0; i < bytes; i += sizeof(long)) { 1242 if (*(const long *)(buf + i) != 0) 1243 return (0); 1244 } 1245 return (1); 1246 } 1247 1248 /* 1249 * Helper 1250 * 1251 * Function to "write" a block that contains only zeros. 1252 */ 1253 static 1254 void 1255 zero_write(char *data, hammer2_inode_t *ip, 1256 hammer2_chain_t **parentp, 1257 hammer2_key_t lbase, hammer2_tid_t mtid, int *errorp) 1258 { 1259 hammer2_chain_t *chain; 1260 hammer2_key_t key_dummy; 1261 1262 chain = hammer2_chain_lookup(parentp, &key_dummy, 1263 lbase, lbase, 1264 errorp, 1265 HAMMER2_LOOKUP_NODATA); 1266 if (chain) { 1267 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE) { 1268 hammer2_inode_data_t *wipdata; 1269 1270 if (*errorp == 0) { 1271 *errorp = hammer2_chain_modify_ip(ip, chain, 1272 mtid, 0); 1273 } 1274 if (*errorp == 0) { 1275 wipdata = &chain->data->ipdata; 1276 KKASSERT(wipdata->meta.op_flags & 1277 HAMMER2_OPFLAG_DIRECTDATA); 1278 bzero(wipdata->u.data, HAMMER2_EMBEDDED_BYTES); 1279 ++hammer2_iod_file_wembed; 1280 } 1281 } else { 1282 /* chain->error ok for deletion */ 1283 hammer2_chain_delete(*parentp, chain, 1284 mtid, HAMMER2_DELETE_PERMANENT); 1285 ++hammer2_iod_file_wzero; 1286 } 1287 atomic_set_int(&ip->flags, HAMMER2_INODE_DIRTYDATA); 1288 hammer2_chain_unlock(chain); 1289 hammer2_chain_drop(chain); 1290 } else { 1291 ++hammer2_iod_file_wzero; 1292 } 1293 } 1294 1295 /* 1296 * Helper 1297 * 1298 * Function to write the data as it is, without performing any sort of 1299 * compression. This function is used in path without compression and 1300 * default zero-checking path. 1301 */ 1302 static 1303 void 1304 hammer2_write_bp(hammer2_chain_t *chain, char *data, int ioflag, 1305 int pblksize, 1306 hammer2_tid_t mtid, int *errorp, int check_algo) 1307 { 1308 hammer2_inode_data_t *wipdata; 1309 hammer2_io_t *dio; 1310 char *bdata; 1311 int error; 1312 1313 error = 0; /* XXX TODO below */ 1314 1315 KKASSERT(chain->flags & HAMMER2_CHAIN_MODIFIED); 1316 1317 switch(chain->bref.type) { 1318 case HAMMER2_BREF_TYPE_INODE: 1319 wipdata = &chain->data->ipdata; 1320 KKASSERT(wipdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA); 1321 bcopy(data, wipdata->u.data, HAMMER2_EMBEDDED_BYTES); 1322 error = 0; 1323 ++hammer2_iod_file_wembed; 1324 break; 1325 case HAMMER2_BREF_TYPE_DATA: 1326 error = hammer2_io_newnz(chain->hmp, 1327 chain->bref.type, 1328 chain->bref.data_off, 1329 chain->bytes, &dio); 1330 if (error) { 1331 hammer2_io_bqrelse(&dio); 1332 kprintf("hammer2: WRITE PATH: " 1333 "dbp bread error\n"); 1334 break; 1335 } 1336 bdata = hammer2_io_data(dio, chain->bref.data_off); 1337 1338 chain->bref.methods = HAMMER2_ENC_COMP(HAMMER2_COMP_NONE) + 1339 HAMMER2_ENC_CHECK(check_algo); 1340 bcopy(data, bdata, chain->bytes); 1341 1342 /* 1343 * The flush code doesn't calculate check codes for 1344 * file data (doing so can result in excessive I/O), 1345 * so we do it here. 1346 */ 1347 hammer2_chain_setcheck(chain, bdata); 1348 1349 /* 1350 * Device buffer is now valid, chain is no longer in 1351 * the initial state. 1352 * 1353 * (No blockref table worries with file data) 1354 */ 1355 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL); 1356 hammer2_dedup_record(chain, dio, bdata); 1357 1358 if (ioflag & IO_SYNC) { 1359 /* 1360 * Synchronous I/O requested. 1361 */ 1362 hammer2_io_bwrite(&dio); 1363 /* 1364 } else if ((ioflag & IO_DIRECT) && 1365 loff + n == pblksize) { 1366 hammer2_io_bdwrite(&dio); 1367 */ 1368 } else if (ioflag & IO_ASYNC) { 1369 hammer2_io_bawrite(&dio); 1370 } else { 1371 hammer2_io_bdwrite(&dio); 1372 } 1373 break; 1374 default: 1375 panic("hammer2_write_bp: bad chain type %d\n", 1376 chain->bref.type); 1377 /* NOT REACHED */ 1378 error = 0; 1379 break; 1380 } 1381 *errorp = error; 1382 } 1383 1384 /* 1385 * LIVE DEDUP HEURISTICS 1386 * 1387 * Record media and crc information for possible dedup operation. Note 1388 * that the dedup mask bits must also be set in the related DIO for a dedup 1389 * to be fully validated (which is handled in the freemap allocation code). 1390 * 1391 * WARNING! This code is SMP safe but the heuristic allows SMP collisions. 1392 * All fields must be loaded into locals and validated. 1393 * 1394 * WARNING! Should only be used for file data and directory entries, 1395 * hammer2_chain_modify() only checks for the dedup case on data 1396 * chains. Also, dedup data can only be recorded for committed 1397 * chains (so NOT strategy writes which can undergo further 1398 * modification after the fact!). 1399 */ 1400 void 1401 hammer2_dedup_record(hammer2_chain_t *chain, hammer2_io_t *dio, char *data) 1402 { 1403 hammer2_dev_t *hmp; 1404 hammer2_dedup_t *dedup; 1405 uint64_t crc; 1406 uint64_t mask; 1407 int best = 0; 1408 int i; 1409 int dticks; 1410 1411 /* 1412 * We can only record a dedup if we have media data to test against. 1413 * If dedup is not enabled, return early, which allows a chain to 1414 * remain marked MODIFIED (which might have benefits in special 1415 * situations, though typically it does not). 1416 */ 1417 if (hammer2_dedup_enable == 0) 1418 return; 1419 if (dio == NULL) { 1420 dio = chain->dio; 1421 if (dio == NULL) 1422 return; 1423 } 1424 1425 hmp = chain->hmp; 1426 1427 switch(HAMMER2_DEC_CHECK(chain->bref.methods)) { 1428 case HAMMER2_CHECK_ISCSI32: 1429 /* 1430 * XXX use the built-in crc (the dedup lookup sequencing 1431 * needs to be fixed so the check code is already present 1432 * when dedup_lookup is called) 1433 */ 1434 #if 0 1435 crc = (uint64_t)(uint32_t)chain->bref.check.iscsi32.value; 1436 #endif 1437 crc = XXH64(data, chain->bytes, XXH_HAMMER2_SEED); 1438 break; 1439 case HAMMER2_CHECK_XXHASH64: 1440 crc = chain->bref.check.xxhash64.value; 1441 break; 1442 case HAMMER2_CHECK_SHA192: 1443 /* 1444 * XXX use the built-in crc (the dedup lookup sequencing 1445 * needs to be fixed so the check code is already present 1446 * when dedup_lookup is called) 1447 */ 1448 #if 0 1449 crc = ((uint64_t *)chain->bref.check.sha192.data)[0] ^ 1450 ((uint64_t *)chain->bref.check.sha192.data)[1] ^ 1451 ((uint64_t *)chain->bref.check.sha192.data)[2]; 1452 #endif 1453 crc = XXH64(data, chain->bytes, XXH_HAMMER2_SEED); 1454 break; 1455 default: 1456 /* 1457 * Cannot dedup without a check code 1458 * 1459 * NOTE: In particular, CHECK_NONE allows a sector to be 1460 * overwritten without copy-on-write, recording 1461 * a dedup block for a CHECK_NONE object would be 1462 * a disaster! 1463 */ 1464 return; 1465 } 1466 1467 atomic_set_int(&chain->flags, HAMMER2_CHAIN_DEDUPABLE); 1468 1469 dedup = &hmp->heur_dedup[crc & (HAMMER2_DEDUP_HEUR_MASK & ~3)]; 1470 for (i = 0; i < 4; ++i) { 1471 if (dedup[i].data_crc == crc) { 1472 best = i; 1473 break; 1474 } 1475 dticks = (int)(dedup[i].ticks - dedup[best].ticks); 1476 if (dticks < 0 || dticks > hz * 60 * 30) 1477 best = i; 1478 } 1479 dedup += best; 1480 if (hammer2_debug & 0x40000) { 1481 kprintf("REC %04x %016jx %016jx\n", 1482 (int)(dedup - hmp->heur_dedup), 1483 crc, 1484 chain->bref.data_off); 1485 } 1486 dedup->ticks = ticks; 1487 dedup->data_off = chain->bref.data_off; 1488 dedup->data_crc = crc; 1489 1490 /* 1491 * Set the valid bits for the dedup only after we know the data 1492 * buffer has been updated. The alloc bits were set (and the valid 1493 * bits cleared) when the media was allocated. 1494 * 1495 * This is done in two stages becuase the bulkfree code can race 1496 * the gap between allocation and data population. Both masks must 1497 * be set before a bcmp/dedup operation is able to use the block. 1498 */ 1499 mask = hammer2_dedup_mask(dio, chain->bref.data_off, chain->bytes); 1500 atomic_set_64(&dio->dedup_valid, mask); 1501 1502 #if 0 1503 /* 1504 * XXX removed. MODIFIED is an integral part of the flush code, 1505 * lets not just clear it 1506 */ 1507 /* 1508 * Once we record the dedup the chain must be marked clean to 1509 * prevent reuse of the underlying block. Remember that this 1510 * write occurs when the buffer cache is flushed (i.e. on sync(), 1511 * fsync(), filesystem periodic sync, or when the kernel needs to 1512 * flush a buffer), and not whenever the user write()s. 1513 */ 1514 if (chain->flags & HAMMER2_CHAIN_MODIFIED) { 1515 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_MODIFIED); 1516 atomic_add_long(&hammer2_count_modified_chains, -1); 1517 if (chain->pmp) 1518 hammer2_pfs_memory_wakeup(chain->pmp); 1519 } 1520 #endif 1521 } 1522 1523 static 1524 hammer2_off_t 1525 hammer2_dedup_lookup(hammer2_dev_t *hmp, char **datap, int pblksize) 1526 { 1527 hammer2_dedup_t *dedup; 1528 hammer2_io_t *dio; 1529 hammer2_off_t off; 1530 uint64_t crc; 1531 uint64_t mask; 1532 char *data; 1533 char *dtmp; 1534 int i; 1535 1536 if (hammer2_dedup_enable == 0) 1537 return 0; 1538 data = *datap; 1539 if (data == NULL) 1540 return 0; 1541 1542 /* 1543 * XXX use the built-in crc (the dedup lookup sequencing 1544 * needs to be fixed so the check code is already present 1545 * when dedup_lookup is called) 1546 */ 1547 crc = XXH64(data, pblksize, XXH_HAMMER2_SEED); 1548 dedup = &hmp->heur_dedup[crc & (HAMMER2_DEDUP_HEUR_MASK & ~3)]; 1549 1550 if (hammer2_debug & 0x40000) { 1551 kprintf("LOC %04x/4 %016jx\n", 1552 (int)(dedup - hmp->heur_dedup), 1553 crc); 1554 } 1555 1556 for (i = 0; i < 4; ++i) { 1557 off = dedup[i].data_off; 1558 cpu_ccfence(); 1559 if (dedup[i].data_crc != crc) 1560 continue; 1561 if ((1 << (int)(off & HAMMER2_OFF_MASK_RADIX)) != pblksize) 1562 continue; 1563 dio = hammer2_io_getquick(hmp, off, pblksize); 1564 if (dio) { 1565 dtmp = hammer2_io_data(dio, off), 1566 mask = hammer2_dedup_mask(dio, off, pblksize); 1567 if ((dio->dedup_alloc & mask) == mask && 1568 (dio->dedup_valid & mask) == mask && 1569 bcmp(data, dtmp, pblksize) == 0) { 1570 if (hammer2_debug & 0x40000) { 1571 kprintf("DEDUP SUCCESS %016jx\n", 1572 (intmax_t)off); 1573 } 1574 hammer2_io_putblk(&dio); 1575 *datap = NULL; 1576 dedup[i].ticks = ticks; /* update use */ 1577 atomic_add_long(&hammer2_iod_file_wdedup, 1578 pblksize); 1579 1580 return off; /* RETURN */ 1581 } 1582 hammer2_io_putblk(&dio); 1583 } 1584 } 1585 return 0; 1586 } 1587 1588 /* 1589 * Poof. Races are ok, if someone gets in and reuses a dedup offset 1590 * before or while we are clearing it they will also recover the freemap 1591 * entry (set it to fully allocated), so a bulkfree race can only set it 1592 * to a possibly-free state. 1593 * 1594 * XXX ok, well, not really sure races are ok but going to run with it 1595 * for the moment. 1596 */ 1597 void 1598 hammer2_dedup_clear(hammer2_dev_t *hmp) 1599 { 1600 int i; 1601 1602 for (i = 0; i < HAMMER2_DEDUP_HEUR_SIZE; ++i) { 1603 hmp->heur_dedup[i].data_off = 0; 1604 hmp->heur_dedup[i].ticks = ticks - 1; 1605 } 1606 } 1607