1 /* 2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 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 "hammer.h" 36 37 static int hammer_mem_lookup(hammer_cursor_t cursor); 38 static int hammer_mem_first(hammer_cursor_t cursor); 39 static int hammer_frontend_trunc_callback(hammer_record_t record, 40 void *data __unused); 41 static int hammer_bulk_scan_callback(hammer_record_t record, void *data); 42 static int hammer_record_needs_overwrite_delete(hammer_record_t record); 43 static int hammer_delete_general(hammer_cursor_t cursor, hammer_inode_t ip, 44 hammer_btree_leaf_elm_t leaf); 45 static int hammer_cursor_localize_data(hammer_data_ondisk_t data, 46 hammer_btree_leaf_elm_t leaf); 47 48 struct rec_trunc_info { 49 u_int16_t rec_type; 50 int64_t trunc_off; 51 }; 52 53 struct hammer_bulk_info { 54 hammer_record_t record; 55 hammer_record_t conflict; 56 }; 57 58 /* 59 * Red-black tree support. Comparison code for insertion. 60 */ 61 static int 62 hammer_rec_rb_compare(hammer_record_t rec1, hammer_record_t rec2) 63 { 64 if (rec1->leaf.base.rec_type < rec2->leaf.base.rec_type) 65 return(-1); 66 if (rec1->leaf.base.rec_type > rec2->leaf.base.rec_type) 67 return(1); 68 69 if (rec1->leaf.base.key < rec2->leaf.base.key) 70 return(-1); 71 if (rec1->leaf.base.key > rec2->leaf.base.key) 72 return(1); 73 74 /* 75 * For search & insertion purposes records deleted by the 76 * frontend or deleted/committed by the backend are silently 77 * ignored. Otherwise pipelined insertions will get messed 78 * up. 79 * 80 * rec1 is greater then rec2 if rec1 is marked deleted. 81 * rec1 is less then rec2 if rec2 is marked deleted. 82 * 83 * Multiple deleted records may be present, do not return 0 84 * if both are marked deleted. 85 */ 86 if (rec1->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | 87 HAMMER_RECF_COMMITTED)) { 88 return(1); 89 } 90 if (rec2->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | 91 HAMMER_RECF_COMMITTED)) { 92 return(-1); 93 } 94 95 return(0); 96 } 97 98 /* 99 * Basic record comparison code similar to hammer_btree_cmp(). 100 * 101 * obj_id is not compared and may not yet be assigned in the record. 102 */ 103 static int 104 hammer_rec_cmp(hammer_base_elm_t elm, hammer_record_t rec) 105 { 106 if (elm->rec_type < rec->leaf.base.rec_type) 107 return(-3); 108 if (elm->rec_type > rec->leaf.base.rec_type) 109 return(3); 110 111 if (elm->key < rec->leaf.base.key) 112 return(-2); 113 if (elm->key > rec->leaf.base.key) 114 return(2); 115 116 /* 117 * Never match against an item deleted by the frontend 118 * or backend, or committed by the backend. 119 * 120 * elm is less then rec if rec is marked deleted. 121 */ 122 if (rec->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | 123 HAMMER_RECF_COMMITTED)) { 124 return(-1); 125 } 126 return(0); 127 } 128 129 /* 130 * Ranged scan to locate overlapping record(s). This is used by 131 * hammer_ip_get_bulk() to locate an overlapping record. We have 132 * to use a ranged scan because the keys for data records with the 133 * same file base offset can be different due to differing data_len's. 134 * 135 * NOTE: The base file offset of a data record is (key - data_len), not (key). 136 */ 137 static int 138 hammer_rec_overlap_cmp(hammer_record_t rec, void *data) 139 { 140 struct hammer_bulk_info *info = data; 141 hammer_btree_leaf_elm_t leaf = &info->record->leaf; 142 143 if (rec->leaf.base.rec_type < leaf->base.rec_type) 144 return(-3); 145 if (rec->leaf.base.rec_type > leaf->base.rec_type) 146 return(3); 147 148 /* 149 * Overlap compare 150 */ 151 if (leaf->base.rec_type == HAMMER_RECTYPE_DATA) { 152 /* rec_beg >= leaf_end */ 153 if (rec->leaf.base.key - rec->leaf.data_len >= leaf->base.key) 154 return(2); 155 /* rec_end <= leaf_beg */ 156 if (rec->leaf.base.key <= leaf->base.key - leaf->data_len) 157 return(-2); 158 } else { 159 if (rec->leaf.base.key < leaf->base.key) 160 return(-2); 161 if (rec->leaf.base.key > leaf->base.key) 162 return(2); 163 } 164 165 /* 166 * We have to return 0 at this point, even if DELETED_FE is set, 167 * because returning anything else will cause the scan to ignore 168 * one of the branches when we really want it to check both. 169 */ 170 return(0); 171 } 172 173 /* 174 * RB_SCAN comparison code for hammer_mem_first(). The argument order 175 * is reversed so the comparison result has to be negated. key_beg and 176 * key_end are both range-inclusive. 177 * 178 * Localized deletions are not cached in-memory. 179 */ 180 static 181 int 182 hammer_rec_scan_cmp(hammer_record_t rec, void *data) 183 { 184 hammer_cursor_t cursor = data; 185 int r; 186 187 r = hammer_rec_cmp(&cursor->key_beg, rec); 188 if (r > 1) 189 return(-1); 190 r = hammer_rec_cmp(&cursor->key_end, rec); 191 if (r < -1) 192 return(1); 193 return(0); 194 } 195 196 /* 197 * This compare function is used when simply looking up key_beg. 198 */ 199 static 200 int 201 hammer_rec_find_cmp(hammer_record_t rec, void *data) 202 { 203 hammer_cursor_t cursor = data; 204 int r; 205 206 r = hammer_rec_cmp(&cursor->key_beg, rec); 207 if (r > 1) 208 return(-1); 209 if (r < -1) 210 return(1); 211 return(0); 212 } 213 214 /* 215 * Locate blocks within the truncation range. Partial blocks do not count. 216 */ 217 static 218 int 219 hammer_rec_trunc_cmp(hammer_record_t rec, void *data) 220 { 221 struct rec_trunc_info *info = data; 222 223 if (rec->leaf.base.rec_type < info->rec_type) 224 return(-1); 225 if (rec->leaf.base.rec_type > info->rec_type) 226 return(1); 227 228 switch(rec->leaf.base.rec_type) { 229 case HAMMER_RECTYPE_DB: 230 /* 231 * DB record key is not beyond the truncation point, retain. 232 */ 233 if (rec->leaf.base.key < info->trunc_off) 234 return(-1); 235 break; 236 case HAMMER_RECTYPE_DATA: 237 /* 238 * DATA record offset start is not beyond the truncation point, 239 * retain. 240 */ 241 if (rec->leaf.base.key - rec->leaf.data_len < info->trunc_off) 242 return(-1); 243 break; 244 default: 245 panic("hammer_rec_trunc_cmp: unexpected record type"); 246 } 247 248 /* 249 * The record start is >= the truncation point, return match, 250 * the record should be destroyed. 251 */ 252 return(0); 253 } 254 255 RB_GENERATE(hammer_rec_rb_tree, hammer_record, rb_node, hammer_rec_rb_compare); 256 257 /* 258 * Allocate a record for the caller to finish filling in. The record is 259 * returned referenced. In order to manually set data call this function 260 * with data_len=0 and then manually set record->leaf.data_len and 261 * record->data later. 262 */ 263 hammer_record_t 264 hammer_alloc_mem_record(hammer_inode_t ip, int data_len) 265 { 266 hammer_record_t record; 267 hammer_mount_t hmp; 268 269 hmp = ip->hmp; 270 ++hammer_count_records; 271 record = kmalloc(sizeof(*record), hmp->m_misc, 272 M_WAITOK | M_ZERO | M_USE_RESERVE); 273 record->flush_state = HAMMER_FST_IDLE; 274 record->ip = ip; 275 record->leaf.base.btype = HAMMER_BTREE_TYPE_RECORD; 276 record->leaf.data_len = data_len; 277 hammer_ref(&record->lock); 278 279 if (data_len) { 280 record->data = kmalloc(data_len, hmp->m_misc, M_WAITOK | M_ZERO); 281 record->flags |= HAMMER_RECF_ALLOCDATA; 282 ++hammer_count_record_datas; 283 } 284 285 return (record); 286 } 287 288 void 289 hammer_wait_mem_record_ident(hammer_record_t record, const char *ident) 290 { 291 while (record->flush_state == HAMMER_FST_FLUSH) { 292 record->flags |= HAMMER_RECF_WANTED; 293 tsleep(record, 0, ident, 0); 294 } 295 } 296 297 /* 298 * Called from the backend, hammer_inode.c, after a record has been 299 * flushed to disk. The record has been exclusively locked by the 300 * caller and interlocked with BE. 301 * 302 * We clean up the state, unlock, and release the record (the record 303 * was referenced by the fact that it was in the HAMMER_FST_FLUSH state). 304 */ 305 void 306 hammer_flush_record_done(hammer_record_t record, int error) 307 { 308 hammer_inode_t target_ip; 309 310 KKASSERT(record->flush_state == HAMMER_FST_FLUSH); 311 KKASSERT(record->flags & HAMMER_RECF_INTERLOCK_BE); 312 313 /* 314 * If an error occured, the backend was unable to sync the 315 * record to its media. Leave the record intact. 316 */ 317 if (error) { 318 hammer_critical_error(record->ip->hmp, record->ip, error, 319 "while flushing record"); 320 } 321 322 --record->flush_group->refs; 323 record->flush_group = NULL; 324 325 /* 326 * Adjust the flush state and dependancy based on success or 327 * failure. 328 */ 329 if (record->flags & (HAMMER_RECF_DELETED_BE | HAMMER_RECF_COMMITTED)) { 330 if ((target_ip = record->target_ip) != NULL) { 331 TAILQ_REMOVE(&target_ip->target_list, record, 332 target_entry); 333 record->target_ip = NULL; 334 hammer_test_inode(target_ip); 335 } 336 record->flush_state = HAMMER_FST_IDLE; 337 } else { 338 if (record->target_ip) { 339 record->flush_state = HAMMER_FST_SETUP; 340 hammer_test_inode(record->ip); 341 hammer_test_inode(record->target_ip); 342 } else { 343 record->flush_state = HAMMER_FST_IDLE; 344 } 345 } 346 record->flags &= ~HAMMER_RECF_INTERLOCK_BE; 347 348 /* 349 * Cleanup 350 */ 351 if (record->flags & HAMMER_RECF_WANTED) { 352 record->flags &= ~HAMMER_RECF_WANTED; 353 wakeup(record); 354 } 355 hammer_rel_mem_record(record); 356 } 357 358 /* 359 * Release a memory record. Records marked for deletion are immediately 360 * removed from the RB-Tree but otherwise left intact until the last ref 361 * goes away. 362 */ 363 void 364 hammer_rel_mem_record(struct hammer_record *record) 365 { 366 hammer_mount_t hmp; 367 hammer_reserve_t resv; 368 hammer_inode_t ip; 369 hammer_inode_t target_ip; 370 int diddrop; 371 372 hammer_rel(&record->lock); 373 374 if (hammer_norefs(&record->lock)) { 375 /* 376 * Upon release of the last reference wakeup any waiters. 377 * The record structure may get destroyed so callers will 378 * loop up and do a relookup. 379 * 380 * WARNING! Record must be removed from RB-TREE before we 381 * might possibly block. hammer_test_inode() can block! 382 */ 383 ip = record->ip; 384 hmp = ip->hmp; 385 386 /* 387 * Upon release of the last reference a record marked deleted 388 * by the front or backend, or committed by the backend, 389 * is destroyed. 390 */ 391 if (record->flags & (HAMMER_RECF_DELETED_FE | 392 HAMMER_RECF_DELETED_BE | 393 HAMMER_RECF_COMMITTED)) { 394 KKASSERT(hammer_isactive(&ip->lock) > 0); 395 KKASSERT(record->flush_state != HAMMER_FST_FLUSH); 396 397 /* 398 * target_ip may have zero refs, we have to ref it 399 * to prevent it from being ripped out from under 400 * us. 401 */ 402 if ((target_ip = record->target_ip) != NULL) { 403 TAILQ_REMOVE(&target_ip->target_list, 404 record, target_entry); 405 record->target_ip = NULL; 406 hammer_ref(&target_ip->lock); 407 } 408 409 /* 410 * Remove the record from the RB-Tree 411 */ 412 if (record->flags & HAMMER_RECF_ONRBTREE) { 413 RB_REMOVE(hammer_rec_rb_tree, 414 &ip->rec_tree, 415 record); 416 record->flags &= ~HAMMER_RECF_ONRBTREE; 417 KKASSERT(ip->rsv_recs > 0); 418 if (RB_EMPTY(&ip->rec_tree)) { 419 ip->flags &= ~HAMMER_INODE_XDIRTY; 420 ip->sync_flags &= ~HAMMER_INODE_XDIRTY; 421 } 422 diddrop = 1; 423 } else { 424 diddrop = 0; 425 } 426 427 /* 428 * We must wait for any direct-IO to complete before 429 * we can destroy the record because the bio may 430 * have a reference to it. 431 */ 432 if (record->gflags & 433 (HAMMER_RECG_DIRECT_IO | HAMMER_RECG_DIRECT_INVAL)) { 434 hammer_io_direct_wait(record); 435 } 436 437 /* 438 * Account for the completion after the direct IO 439 * has completed. 440 */ 441 if (diddrop) { 442 --hmp->rsv_recs; 443 --ip->rsv_recs; 444 hmp->rsv_databytes -= record->leaf.data_len; 445 446 if (RB_EMPTY(&ip->rec_tree)) 447 hammer_test_inode(ip); 448 if ((ip->flags & HAMMER_INODE_RECSW) && 449 ip->rsv_recs <= hammer_limit_inode_recs/2) { 450 ip->flags &= ~HAMMER_INODE_RECSW; 451 wakeup(&ip->rsv_recs); 452 } 453 } 454 455 /* 456 * Do this test after removing record from the RB-Tree. 457 */ 458 if (target_ip) { 459 hammer_test_inode(target_ip); 460 hammer_rel_inode(target_ip, 0); 461 } 462 463 if (record->flags & HAMMER_RECF_ALLOCDATA) { 464 --hammer_count_record_datas; 465 kfree(record->data, hmp->m_misc); 466 record->flags &= ~HAMMER_RECF_ALLOCDATA; 467 } 468 469 /* 470 * Release the reservation. 471 * 472 * If the record was not committed we can theoretically 473 * undo the reservation. However, doing so might 474 * create weird edge cases with the ordering of 475 * direct writes because the related buffer cache 476 * elements are per-vnode. So we don't try. 477 */ 478 if ((resv = record->resv) != NULL) { 479 /* XXX undo leaf.data_offset,leaf.data_len */ 480 hammer_blockmap_reserve_complete(hmp, resv); 481 record->resv = NULL; 482 } 483 record->data = NULL; 484 --hammer_count_records; 485 kfree(record, hmp->m_misc); 486 } 487 } 488 } 489 490 /* 491 * Record visibility depends on whether the record is being accessed by 492 * the backend or the frontend. Backend tests ignore the frontend delete 493 * flag. Frontend tests do NOT ignore the backend delete/commit flags and 494 * must also check for commit races. 495 * 496 * Return non-zero if the record is visible, zero if it isn't or if it is 497 * deleted. Returns 0 if the record has been comitted (unless the special 498 * delete-visibility flag is set). A committed record must be located 499 * via the media B-Tree. Returns non-zero if the record is good. 500 * 501 * If HAMMER_CURSOR_DELETE_VISIBILITY is set we allow deleted memory 502 * records to be returned. This is so pending deletions are detected 503 * when using an iterator to locate an unused hash key, or when we need 504 * to locate historical records on-disk to destroy. 505 */ 506 static __inline 507 int 508 hammer_ip_iterate_mem_good(hammer_cursor_t cursor, hammer_record_t record) 509 { 510 if (cursor->flags & HAMMER_CURSOR_DELETE_VISIBILITY) 511 return(1); 512 if (cursor->flags & HAMMER_CURSOR_BACKEND) { 513 if (record->flags & (HAMMER_RECF_DELETED_BE | 514 HAMMER_RECF_COMMITTED)) { 515 return(0); 516 } 517 } else { 518 if (record->flags & (HAMMER_RECF_DELETED_FE | 519 HAMMER_RECF_DELETED_BE | 520 HAMMER_RECF_COMMITTED)) { 521 return(0); 522 } 523 } 524 return(1); 525 } 526 527 /* 528 * This callback is used as part of the RB_SCAN function for in-memory 529 * records. We terminate it (return -1) as soon as we get a match. 530 * 531 * This routine is used by frontend code. 532 * 533 * The primary compare code does not account for ASOF lookups. This 534 * code handles that case as well as a few others. 535 */ 536 static 537 int 538 hammer_rec_scan_callback(hammer_record_t rec, void *data) 539 { 540 hammer_cursor_t cursor = data; 541 542 /* 543 * We terminate on success, so this should be NULL on entry. 544 */ 545 KKASSERT(cursor->iprec == NULL); 546 547 /* 548 * Skip if the record was marked deleted or committed. 549 */ 550 if (hammer_ip_iterate_mem_good(cursor, rec) == 0) 551 return(0); 552 553 /* 554 * Skip if not visible due to our as-of TID 555 */ 556 if (cursor->flags & HAMMER_CURSOR_ASOF) { 557 if (cursor->asof < rec->leaf.base.create_tid) 558 return(0); 559 if (rec->leaf.base.delete_tid && 560 cursor->asof >= rec->leaf.base.delete_tid) { 561 return(0); 562 } 563 } 564 565 /* 566 * ref the record. The record is protected from backend B-Tree 567 * interactions by virtue of the cursor's IP lock. 568 */ 569 hammer_ref(&rec->lock); 570 571 /* 572 * The record may have been deleted or committed while we 573 * were blocked. XXX remove? 574 */ 575 if (hammer_ip_iterate_mem_good(cursor, rec) == 0) { 576 hammer_rel_mem_record(rec); 577 return(0); 578 } 579 580 /* 581 * Set the matching record and stop the scan. 582 */ 583 cursor->iprec = rec; 584 return(-1); 585 } 586 587 588 /* 589 * Lookup an in-memory record given the key specified in the cursor. Works 590 * just like hammer_btree_lookup() but operates on an inode's in-memory 591 * record list. 592 * 593 * The lookup must fail if the record is marked for deferred deletion. 594 * 595 * The API for mem/btree_lookup() does not mess with the ATE/EOF bits. 596 */ 597 static 598 int 599 hammer_mem_lookup(hammer_cursor_t cursor) 600 { 601 KKASSERT(cursor->ip != NULL); 602 if (cursor->iprec) { 603 hammer_rel_mem_record(cursor->iprec); 604 cursor->iprec = NULL; 605 } 606 hammer_rec_rb_tree_RB_SCAN(&cursor->ip->rec_tree, hammer_rec_find_cmp, 607 hammer_rec_scan_callback, cursor); 608 609 return (cursor->iprec ? 0 : ENOENT); 610 } 611 612 /* 613 * hammer_mem_first() - locate the first in-memory record matching the 614 * cursor within the bounds of the key range. 615 * 616 * WARNING! API is slightly different from btree_first(). hammer_mem_first() 617 * will set ATEMEM the same as MEMEOF, and does not return any error. 618 */ 619 static 620 int 621 hammer_mem_first(hammer_cursor_t cursor) 622 { 623 KKASSERT(cursor->ip != NULL); 624 if (cursor->iprec) { 625 hammer_rel_mem_record(cursor->iprec); 626 cursor->iprec = NULL; 627 } 628 hammer_rec_rb_tree_RB_SCAN(&cursor->ip->rec_tree, hammer_rec_scan_cmp, 629 hammer_rec_scan_callback, cursor); 630 631 if (cursor->iprec) 632 cursor->flags &= ~(HAMMER_CURSOR_MEMEOF | HAMMER_CURSOR_ATEMEM); 633 else 634 cursor->flags |= HAMMER_CURSOR_MEMEOF | HAMMER_CURSOR_ATEMEM; 635 636 return (cursor->iprec ? 0 : ENOENT); 637 } 638 639 /************************************************************************ 640 * HAMMER IN-MEMORY RECORD FUNCTIONS * 641 ************************************************************************ 642 * 643 * These functions manipulate in-memory records. Such records typically 644 * exist prior to being committed to disk or indexed via the on-disk B-Tree. 645 */ 646 647 /* 648 * Add a directory entry (dip,ncp) which references inode (ip). 649 * 650 * Note that the low 32 bits of the namekey are set temporarily to create 651 * a unique in-memory record, and may be modified a second time when the 652 * record is synchronized to disk. In particular, the low 32 bits cannot be 653 * all 0's when synching to disk, which is not handled here. 654 * 655 * NOTE: bytes does not include any terminating \0 on name, and name might 656 * not be terminated. 657 */ 658 int 659 hammer_ip_add_directory(struct hammer_transaction *trans, 660 struct hammer_inode *dip, const char *name, int bytes, 661 struct hammer_inode *ip) 662 { 663 struct hammer_cursor cursor; 664 hammer_record_t record; 665 int error; 666 u_int32_t max_iterations; 667 668 KKASSERT(dip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY); 669 670 record = hammer_alloc_mem_record(dip, HAMMER_ENTRY_SIZE(bytes)); 671 672 record->type = HAMMER_MEM_RECORD_ADD; 673 record->leaf.base.localization = dip->obj_localization + 674 hammer_dir_localization(dip); 675 record->leaf.base.obj_id = dip->obj_id; 676 record->leaf.base.key = hammer_directory_namekey(dip, name, bytes, 677 &max_iterations); 678 record->leaf.base.rec_type = HAMMER_RECTYPE_DIRENTRY; 679 record->leaf.base.obj_type = ip->ino_leaf.base.obj_type; 680 record->data->entry.obj_id = ip->obj_id; 681 record->data->entry.localization = ip->obj_localization; 682 bcopy(name, record->data->entry.name, bytes); 683 684 ++ip->ino_data.nlinks; 685 ip->ino_data.ctime = trans->time; 686 hammer_modify_inode(trans, ip, HAMMER_INODE_DDIRTY); 687 688 /* 689 * Find an unused namekey. Both the in-memory record tree and 690 * the B-Tree are checked. We do not want historically deleted 691 * names to create a collision as our iteration space may be limited, 692 * and since create_tid wouldn't match anyway an ASOF search 693 * must be used to locate collisions. 694 * 695 * delete-visibility is set so pending deletions do not give us 696 * a false-negative on our ability to use an iterator. 697 * 698 * The iterator must not rollover the key. Directory keys only 699 * use the positive key space. 700 */ 701 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); 702 cursor.key_beg = record->leaf.base; 703 cursor.flags |= HAMMER_CURSOR_ASOF; 704 cursor.flags |= HAMMER_CURSOR_DELETE_VISIBILITY; 705 cursor.asof = ip->obj_asof; 706 707 while (hammer_ip_lookup(&cursor) == 0) { 708 ++record->leaf.base.key; 709 KKASSERT(record->leaf.base.key > 0); 710 cursor.key_beg.key = record->leaf.base.key; 711 if (--max_iterations == 0) { 712 hammer_rel_mem_record(record); 713 error = ENOSPC; 714 goto failed; 715 } 716 } 717 718 /* 719 * The target inode and the directory entry are bound together. 720 */ 721 record->target_ip = ip; 722 record->flush_state = HAMMER_FST_SETUP; 723 TAILQ_INSERT_TAIL(&ip->target_list, record, target_entry); 724 725 /* 726 * The inode now has a dependancy and must be taken out of the idle 727 * state. An inode not in an idle state is given an extra reference. 728 * 729 * When transitioning to a SETUP state flag for an automatic reflush 730 * when the dependancies are disposed of if someone is waiting on 731 * the inode. 732 */ 733 if (ip->flush_state == HAMMER_FST_IDLE) { 734 hammer_ref(&ip->lock); 735 ip->flush_state = HAMMER_FST_SETUP; 736 if (ip->flags & HAMMER_INODE_FLUSHW) 737 ip->flags |= HAMMER_INODE_REFLUSH; 738 } 739 error = hammer_mem_add(record); 740 if (error == 0) { 741 dip->ino_data.mtime = trans->time; 742 hammer_modify_inode(trans, dip, HAMMER_INODE_MTIME); 743 } 744 failed: 745 hammer_done_cursor(&cursor); 746 return(error); 747 } 748 749 /* 750 * Delete the directory entry and update the inode link count. The 751 * cursor must be seeked to the directory entry record being deleted. 752 * 753 * The related inode should be share-locked by the caller. The caller is 754 * on the frontend. It could also be NULL indicating that the directory 755 * entry being removed has no related inode. 756 * 757 * This function can return EDEADLK requiring the caller to terminate 758 * the cursor, any locks, wait on the returned record, and retry. 759 */ 760 int 761 hammer_ip_del_directory(struct hammer_transaction *trans, 762 hammer_cursor_t cursor, struct hammer_inode *dip, 763 struct hammer_inode *ip) 764 { 765 hammer_record_t record; 766 int error; 767 768 if (hammer_cursor_inmem(cursor)) { 769 /* 770 * In-memory (unsynchronized) records can simply be freed. 771 * 772 * Even though the HAMMER_RECF_DELETED_FE flag is ignored 773 * by the backend, we must still avoid races against the 774 * backend potentially syncing the record to the media. 775 * 776 * We cannot call hammer_ip_delete_record(), that routine may 777 * only be called from the backend. 778 */ 779 record = cursor->iprec; 780 if (record->flags & (HAMMER_RECF_INTERLOCK_BE | 781 HAMMER_RECF_DELETED_BE | 782 HAMMER_RECF_COMMITTED)) { 783 KKASSERT(cursor->deadlk_rec == NULL); 784 hammer_ref(&record->lock); 785 cursor->deadlk_rec = record; 786 error = EDEADLK; 787 } else { 788 KKASSERT(record->type == HAMMER_MEM_RECORD_ADD); 789 record->flags |= HAMMER_RECF_DELETED_FE; 790 error = 0; 791 } 792 } else { 793 /* 794 * If the record is on-disk we have to queue the deletion by 795 * the record's key. This also causes lookups to skip the 796 * record (lookups for the purposes of finding an unused 797 * directory key do not skip the record). 798 */ 799 KKASSERT(dip->flags & 800 (HAMMER_INODE_ONDISK | HAMMER_INODE_DONDISK)); 801 record = hammer_alloc_mem_record(dip, 0); 802 record->type = HAMMER_MEM_RECORD_DEL; 803 record->leaf.base = cursor->leaf->base; 804 KKASSERT(dip->obj_id == record->leaf.base.obj_id); 805 806 /* 807 * ip may be NULL, indicating the deletion of a directory 808 * entry which has no related inode. 809 */ 810 record->target_ip = ip; 811 if (ip) { 812 record->flush_state = HAMMER_FST_SETUP; 813 TAILQ_INSERT_TAIL(&ip->target_list, record, 814 target_entry); 815 } else { 816 record->flush_state = HAMMER_FST_IDLE; 817 } 818 819 /* 820 * The inode now has a dependancy and must be taken out of 821 * the idle state. An inode not in an idle state is given 822 * an extra reference. 823 * 824 * When transitioning to a SETUP state flag for an automatic 825 * reflush when the dependancies are disposed of if someone 826 * is waiting on the inode. 827 */ 828 if (ip && ip->flush_state == HAMMER_FST_IDLE) { 829 hammer_ref(&ip->lock); 830 ip->flush_state = HAMMER_FST_SETUP; 831 if (ip->flags & HAMMER_INODE_FLUSHW) 832 ip->flags |= HAMMER_INODE_REFLUSH; 833 } 834 835 error = hammer_mem_add(record); 836 } 837 838 /* 839 * One less link. The file may still be open in the OS even after 840 * all links have gone away. 841 * 842 * We have to terminate the cursor before syncing the inode to 843 * avoid deadlocking against ourselves. XXX this may no longer 844 * be true. 845 * 846 * If nlinks drops to zero and the vnode is inactive (or there is 847 * no vnode), call hammer_inode_unloadable_check() to zonk the 848 * inode. If we don't do this here the inode will not be destroyed 849 * on-media until we unmount. 850 */ 851 if (error == 0) { 852 if (ip) { 853 --ip->ino_data.nlinks; /* do before we might block */ 854 ip->ino_data.ctime = trans->time; 855 } 856 dip->ino_data.mtime = trans->time; 857 hammer_modify_inode(trans, dip, HAMMER_INODE_MTIME); 858 if (ip) { 859 hammer_modify_inode(trans, ip, HAMMER_INODE_DDIRTY); 860 if (ip->ino_data.nlinks == 0 && 861 (ip->vp == NULL || (ip->vp->v_flag & VINACTIVE))) { 862 hammer_done_cursor(cursor); 863 hammer_inode_unloadable_check(ip, 1); 864 hammer_flush_inode(ip, 0); 865 } 866 } 867 868 } 869 return(error); 870 } 871 872 /* 873 * Add a record to an inode. 874 * 875 * The caller must allocate the record with hammer_alloc_mem_record(ip,len) and 876 * initialize the following additional fields that are not initialized by these 877 * functions. 878 * 879 * The related inode should be share-locked by the caller. The caller is 880 * on the frontend. 881 * 882 * record->leaf.base.key 883 * record->leaf.base.rec_type 884 * record->leaf.base.localization 885 */ 886 int 887 hammer_ip_add_record(struct hammer_transaction *trans, hammer_record_t record) 888 { 889 hammer_inode_t ip = record->ip; 890 int error; 891 892 KKASSERT(record->leaf.base.localization != 0); 893 record->leaf.base.obj_id = ip->obj_id; 894 record->leaf.base.obj_type = ip->ino_leaf.base.obj_type; 895 error = hammer_mem_add(record); 896 return(error); 897 } 898 899 /* 900 * Locate a pre-existing bulk record in memory. The caller wishes to 901 * replace the record with a new one. The existing record may have a 902 * different length (and thus a different key) so we have to use an 903 * overlap check function. 904 */ 905 static hammer_record_t 906 hammer_ip_get_bulk(hammer_record_t record) 907 { 908 struct hammer_bulk_info info; 909 hammer_inode_t ip = record->ip; 910 911 info.record = record; 912 info.conflict = NULL; 913 hammer_rec_rb_tree_RB_SCAN(&ip->rec_tree, hammer_rec_overlap_cmp, 914 hammer_bulk_scan_callback, &info); 915 916 return(info.conflict); /* may be NULL */ 917 } 918 919 /* 920 * Take records vetted by overlap_cmp. The first non-deleted record 921 * (if any) stops the scan. 922 */ 923 static int 924 hammer_bulk_scan_callback(hammer_record_t record, void *data) 925 { 926 struct hammer_bulk_info *info = data; 927 928 if (record->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | 929 HAMMER_RECF_COMMITTED)) { 930 return(0); 931 } 932 hammer_ref(&record->lock); 933 info->conflict = record; 934 return(-1); /* stop scan */ 935 } 936 937 /* 938 * Reserve blockmap space placemarked with an in-memory record. 939 * 940 * This routine is called by the frontend in order to be able to directly 941 * flush a buffer cache buffer. The frontend has locked the related buffer 942 * cache buffers and we should be able to manipulate any overlapping 943 * in-memory records. 944 * 945 * The caller is responsible for adding the returned record and deleting 946 * the returned conflicting record (if any), typically by calling 947 * hammer_ip_replace_bulk() (via hammer_io_direct_write()). 948 */ 949 hammer_record_t 950 hammer_ip_add_bulk(hammer_inode_t ip, off_t file_offset, void *data, int bytes, 951 int *errorp) 952 { 953 hammer_record_t record; 954 hammer_dedup_cache_t dcp; 955 hammer_crc_t crc; 956 int zone; 957 958 /* 959 * Create a record to cover the direct write. The record cannot 960 * be added to the in-memory RB tree here as it might conflict 961 * with an existing memory record. See hammer_io_direct_write(). 962 * 963 * The backend is responsible for finalizing the space reserved in 964 * this record. 965 * 966 * XXX bytes not aligned, depend on the reservation code to 967 * align the reservation. 968 */ 969 record = hammer_alloc_mem_record(ip, 0); 970 zone = (bytes >= HAMMER_BUFSIZE) ? HAMMER_ZONE_LARGE_DATA_INDEX : 971 HAMMER_ZONE_SMALL_DATA_INDEX; 972 if (bytes == 0) 973 crc = 0; 974 else 975 crc = crc32(data, bytes); 976 977 if (hammer_live_dedup == 0) 978 goto nodedup; 979 if ((dcp = hammer_dedup_cache_lookup(ip->hmp, crc)) != NULL) { 980 struct hammer_dedup_cache tmp = *dcp; 981 982 record->resv = hammer_blockmap_reserve_dedup(ip->hmp, zone, 983 bytes, tmp.data_offset, errorp); 984 if (record->resv == NULL) 985 goto nodedup; 986 987 if (!hammer_dedup_validate(&tmp, zone, bytes, data)) { 988 hammer_blockmap_reserve_complete(ip->hmp, record->resv); 989 goto nodedup; 990 } 991 992 record->leaf.data_offset = tmp.data_offset; 993 record->flags |= HAMMER_RECF_DEDUPED; 994 } else { 995 nodedup: 996 record->resv = hammer_blockmap_reserve(ip->hmp, zone, bytes, 997 &record->leaf.data_offset, errorp); 998 if (record->resv == NULL) { 999 kprintf("hammer_ip_add_bulk: reservation failed\n"); 1000 hammer_rel_mem_record(record); 1001 return(NULL); 1002 } 1003 } 1004 1005 record->type = HAMMER_MEM_RECORD_DATA; 1006 record->leaf.base.rec_type = HAMMER_RECTYPE_DATA; 1007 record->leaf.base.obj_type = ip->ino_leaf.base.obj_type; 1008 record->leaf.base.obj_id = ip->obj_id; 1009 record->leaf.base.key = file_offset + bytes; 1010 record->leaf.base.localization = ip->obj_localization + 1011 HAMMER_LOCALIZE_MISC; 1012 record->leaf.data_len = bytes; 1013 record->leaf.data_crc = crc; 1014 KKASSERT(*errorp == 0); 1015 1016 return(record); 1017 } 1018 1019 /* 1020 * Called by hammer_io_direct_write() prior to any possible completion 1021 * of the BIO to emplace the memory record associated with the I/O and 1022 * to replace any prior memory record which might still be active. 1023 * 1024 * Setting the FE deleted flag on the old record (if any) avoids any RB 1025 * tree insertion conflict, amoung other things. 1026 * 1027 * This has to be done prior to the caller completing any related buffer 1028 * cache I/O or a reinstantiation of the buffer may load data from the 1029 * old media location instead of the new media location. The holding 1030 * of the locked buffer cache buffer serves to interlock the record 1031 * replacement operation. 1032 */ 1033 void 1034 hammer_ip_replace_bulk(hammer_mount_t hmp, hammer_record_t record) 1035 { 1036 hammer_record_t conflict; 1037 int error __debugvar; 1038 1039 while ((conflict = hammer_ip_get_bulk(record)) != NULL) { 1040 if ((conflict->flags & HAMMER_RECF_INTERLOCK_BE) == 0) { 1041 conflict->flags |= HAMMER_RECF_DELETED_FE; 1042 break; 1043 } 1044 conflict->flags |= HAMMER_RECF_WANTED; 1045 tsleep(conflict, 0, "hmrrc3", 0); 1046 hammer_rel_mem_record(conflict); 1047 } 1048 error = hammer_mem_add(record); 1049 if (conflict) 1050 hammer_rel_mem_record(conflict); 1051 KKASSERT(error == 0); 1052 } 1053 1054 /* 1055 * Frontend truncation code. Scan in-memory records only. On-disk records 1056 * and records in a flushing state are handled by the backend. The vnops 1057 * setattr code will handle the block containing the truncation point. 1058 * 1059 * Partial blocks are not deleted. 1060 * 1061 * This code is only called on regular files. 1062 */ 1063 int 1064 hammer_ip_frontend_trunc(struct hammer_inode *ip, off_t file_size) 1065 { 1066 struct rec_trunc_info info; 1067 1068 switch(ip->ino_data.obj_type) { 1069 case HAMMER_OBJTYPE_REGFILE: 1070 info.rec_type = HAMMER_RECTYPE_DATA; 1071 break; 1072 case HAMMER_OBJTYPE_DBFILE: 1073 info.rec_type = HAMMER_RECTYPE_DB; 1074 break; 1075 default: 1076 return(EINVAL); 1077 } 1078 info.trunc_off = file_size; 1079 hammer_rec_rb_tree_RB_SCAN(&ip->rec_tree, hammer_rec_trunc_cmp, 1080 hammer_frontend_trunc_callback, &info); 1081 return(0); 1082 } 1083 1084 /* 1085 * Scan callback for frontend records to destroy during a truncation. 1086 * We must ensure that DELETED_FE is set on the record or the frontend 1087 * will get confused in future read() calls. 1088 * 1089 * NOTE: DELETED_FE cannot be set while the record interlock (BE) is held. 1090 * In this rare case we must wait for the interlock to be cleared. 1091 * 1092 * NOTE: This function is only called on regular files. There are further 1093 * restrictions to the setting of DELETED_FE on directory records 1094 * undergoing a flush due to sensitive inode link count calculations. 1095 */ 1096 static int 1097 hammer_frontend_trunc_callback(hammer_record_t record, void *data __unused) 1098 { 1099 if (record->flags & HAMMER_RECF_DELETED_FE) 1100 return(0); 1101 #if 0 1102 if (record->flush_state == HAMMER_FST_FLUSH) 1103 return(0); 1104 #endif 1105 hammer_ref(&record->lock); 1106 while (record->flags & HAMMER_RECF_INTERLOCK_BE) 1107 hammer_wait_mem_record_ident(record, "hmmtrr"); 1108 record->flags |= HAMMER_RECF_DELETED_FE; 1109 hammer_rel_mem_record(record); 1110 return(0); 1111 } 1112 1113 /* 1114 * Return 1 if the caller must check for and delete existing records 1115 * before writing out a new data record. 1116 * 1117 * Return 0 if the caller can just insert the record into the B-Tree without 1118 * checking. 1119 */ 1120 static int 1121 hammer_record_needs_overwrite_delete(hammer_record_t record) 1122 { 1123 hammer_inode_t ip = record->ip; 1124 int64_t file_offset; 1125 int r; 1126 1127 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) 1128 file_offset = record->leaf.base.key; 1129 else 1130 file_offset = record->leaf.base.key - record->leaf.data_len; 1131 r = (file_offset < ip->save_trunc_off); 1132 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { 1133 if (ip->save_trunc_off <= record->leaf.base.key) 1134 ip->save_trunc_off = record->leaf.base.key + 1; 1135 } else { 1136 if (ip->save_trunc_off < record->leaf.base.key) 1137 ip->save_trunc_off = record->leaf.base.key; 1138 } 1139 return(r); 1140 } 1141 1142 /* 1143 * Backend code. Sync a record to the media. 1144 */ 1145 int 1146 hammer_ip_sync_record_cursor(hammer_cursor_t cursor, hammer_record_t record) 1147 { 1148 hammer_transaction_t trans = cursor->trans; 1149 int64_t file_offset; 1150 int bytes; 1151 void *bdata; 1152 int error; 1153 int doprop; 1154 1155 KKASSERT(record->flush_state == HAMMER_FST_FLUSH); 1156 KKASSERT(record->flags & HAMMER_RECF_INTERLOCK_BE); 1157 KKASSERT(record->leaf.base.localization != 0); 1158 1159 /* 1160 * Any direct-write related to the record must complete before we 1161 * can sync the record to the on-disk media. 1162 */ 1163 if (record->gflags & (HAMMER_RECG_DIRECT_IO | HAMMER_RECG_DIRECT_INVAL)) 1164 hammer_io_direct_wait(record); 1165 1166 /* 1167 * If this is a bulk-data record placemarker there may be an existing 1168 * record on-disk, indicating a data overwrite. If there is the 1169 * on-disk record must be deleted before we can insert our new record. 1170 * 1171 * We've synthesized this record and do not know what the create_tid 1172 * on-disk is, nor how much data it represents. 1173 * 1174 * Keep in mind that (key) for data records is (base_offset + len), 1175 * not (base_offset). Also, we only want to get rid of on-disk 1176 * records since we are trying to sync our in-memory record, call 1177 * hammer_ip_delete_range() with truncating set to 1 to make sure 1178 * it skips in-memory records. 1179 * 1180 * It is ok for the lookup to return ENOENT. 1181 * 1182 * NOTE OPTIMIZATION: sync_trunc_off is used to determine if we have 1183 * to call hammer_ip_delete_range() or not. This also means we must 1184 * update sync_trunc_off() as we write. 1185 */ 1186 if (record->type == HAMMER_MEM_RECORD_DATA && 1187 hammer_record_needs_overwrite_delete(record)) { 1188 file_offset = record->leaf.base.key - record->leaf.data_len; 1189 bytes = (record->leaf.data_len + HAMMER_BUFMASK) & 1190 ~HAMMER_BUFMASK; 1191 KKASSERT((file_offset & HAMMER_BUFMASK) == 0); 1192 error = hammer_ip_delete_range( 1193 cursor, record->ip, 1194 file_offset, file_offset + bytes - 1, 1195 1); 1196 if (error && error != ENOENT) 1197 goto done; 1198 } 1199 1200 /* 1201 * If this is a general record there may be an on-disk version 1202 * that must be deleted before we can insert the new record. 1203 */ 1204 if (record->type == HAMMER_MEM_RECORD_GENERAL) { 1205 error = hammer_delete_general(cursor, record->ip, &record->leaf); 1206 if (error && error != ENOENT) 1207 goto done; 1208 } 1209 1210 /* 1211 * Setup the cursor. 1212 */ 1213 hammer_normalize_cursor(cursor); 1214 cursor->key_beg = record->leaf.base; 1215 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1216 cursor->flags |= HAMMER_CURSOR_BACKEND; 1217 cursor->flags &= ~HAMMER_CURSOR_INSERT; 1218 1219 /* 1220 * Records can wind up on-media before the inode itself is on-media. 1221 * Flag the case. 1222 */ 1223 record->ip->flags |= HAMMER_INODE_DONDISK; 1224 1225 /* 1226 * If we are deleting a directory entry an exact match must be 1227 * found on-disk. 1228 */ 1229 if (record->type == HAMMER_MEM_RECORD_DEL) { 1230 error = hammer_btree_lookup(cursor); 1231 if (error == 0) { 1232 KKASSERT(cursor->iprec == NULL); 1233 error = hammer_ip_delete_record(cursor, record->ip, 1234 trans->tid); 1235 if (error == 0) { 1236 record->flags |= HAMMER_RECF_DELETED_BE | 1237 HAMMER_RECF_COMMITTED; 1238 ++record->ip->rec_generation; 1239 } 1240 } 1241 goto done; 1242 } 1243 1244 /* 1245 * We are inserting. 1246 * 1247 * Issue a lookup to position the cursor and locate the insertion 1248 * point. The target key should not exist. If we are creating a 1249 * directory entry we may have to iterate the low 32 bits of the 1250 * key to find an unused key. 1251 */ 1252 hammer_sync_lock_sh(trans); 1253 cursor->flags |= HAMMER_CURSOR_INSERT; 1254 error = hammer_btree_lookup(cursor); 1255 if (hammer_debug_inode) 1256 kprintf("DOINSERT LOOKUP %d\n", error); 1257 if (error == 0) { 1258 kprintf("hammer_ip_sync_record_cursor: duplicate rec " 1259 "at (%016llx)\n", (long long)record->leaf.base.key); 1260 if (hammer_debug_critical) 1261 Debugger("duplicate record1"); 1262 error = EIO; 1263 } 1264 #if 0 1265 if (record->type == HAMMER_MEM_RECORD_DATA) 1266 kprintf("sync_record %016llx ---------------- %016llx %d\n", 1267 record->leaf.base.key - record->leaf.data_len, 1268 record->leaf.data_offset, error); 1269 #endif 1270 1271 if (error != ENOENT) 1272 goto done_unlock; 1273 1274 /* 1275 * Allocate the record and data. The result buffers will be 1276 * marked as being modified and further calls to 1277 * hammer_modify_buffer() will result in unneeded UNDO records. 1278 * 1279 * Support zero-fill records (data == NULL and data_len != 0) 1280 */ 1281 if (record->type == HAMMER_MEM_RECORD_DATA) { 1282 /* 1283 * The data portion of a bulk-data record has already been 1284 * committed to disk, we need only adjust the layer2 1285 * statistics in the same transaction as our B-Tree insert. 1286 */ 1287 KKASSERT(record->leaf.data_offset != 0); 1288 error = hammer_blockmap_finalize(trans, 1289 record->resv, 1290 record->leaf.data_offset, 1291 record->leaf.data_len); 1292 1293 if (hammer_live_dedup == 2 && 1294 (record->flags & HAMMER_RECF_DEDUPED) == 0) { 1295 hammer_dedup_cache_add(record->ip, &record->leaf); 1296 } 1297 } else if (record->data && record->leaf.data_len) { 1298 /* 1299 * Wholely cached record, with data. Allocate the data. 1300 */ 1301 bdata = hammer_alloc_data(trans, record->leaf.data_len, 1302 record->leaf.base.rec_type, 1303 &record->leaf.data_offset, 1304 &cursor->data_buffer, 1305 0, &error); 1306 if (bdata == NULL) 1307 goto done_unlock; 1308 hammer_crc_set_leaf(record->data, &record->leaf); 1309 hammer_modify_buffer_noundo(trans, cursor->data_buffer); 1310 bcopy(record->data, bdata, record->leaf.data_len); 1311 hammer_modify_buffer_done(cursor->data_buffer); 1312 } else { 1313 /* 1314 * Wholely cached record, without data. 1315 */ 1316 record->leaf.data_offset = 0; 1317 record->leaf.data_crc = 0; 1318 } 1319 1320 error = hammer_btree_insert(cursor, &record->leaf, &doprop); 1321 if (hammer_debug_inode && error) { 1322 kprintf("BTREE INSERT error %d @ %016llx:%d key %016llx\n", 1323 error, 1324 (long long)cursor->node->node_offset, 1325 cursor->index, 1326 (long long)record->leaf.base.key); 1327 } 1328 1329 /* 1330 * Our record is on-disk and we normally mark the in-memory version 1331 * as having been committed (and not BE-deleted). 1332 * 1333 * If the record represented a directory deletion but we had to 1334 * sync a valid directory entry to disk due to dependancies, 1335 * we must convert the record to a covering delete so the 1336 * frontend does not have visibility on the synced entry. 1337 * 1338 * WARNING: cursor's leaf pointer may have changed after do_propagation 1339 * returns! 1340 */ 1341 if (error == 0) { 1342 if (doprop) { 1343 hammer_btree_do_propagation(cursor, 1344 record->ip->pfsm, 1345 &record->leaf); 1346 } 1347 if (record->flags & HAMMER_RECF_CONVERT_DELETE) { 1348 /* 1349 * Must convert deleted directory entry add 1350 * to a directory entry delete. 1351 */ 1352 KKASSERT(record->type == HAMMER_MEM_RECORD_ADD); 1353 record->flags &= ~HAMMER_RECF_DELETED_FE; 1354 record->type = HAMMER_MEM_RECORD_DEL; 1355 KKASSERT(record->ip->obj_id == record->leaf.base.obj_id); 1356 KKASSERT(record->flush_state == HAMMER_FST_FLUSH); 1357 record->flags &= ~HAMMER_RECF_CONVERT_DELETE; 1358 KKASSERT((record->flags & (HAMMER_RECF_COMMITTED | 1359 HAMMER_RECF_DELETED_BE)) == 0); 1360 /* converted record is not yet committed */ 1361 /* hammer_flush_record_done takes care of the rest */ 1362 } else { 1363 /* 1364 * Everything went fine and we are now done with 1365 * this record. 1366 */ 1367 record->flags |= HAMMER_RECF_COMMITTED; 1368 ++record->ip->rec_generation; 1369 } 1370 } else { 1371 if (record->leaf.data_offset) { 1372 hammer_blockmap_free(trans, record->leaf.data_offset, 1373 record->leaf.data_len); 1374 } 1375 } 1376 done_unlock: 1377 hammer_sync_unlock(trans); 1378 done: 1379 return(error); 1380 } 1381 1382 /* 1383 * Add the record to the inode's rec_tree. The low 32 bits of a directory 1384 * entry's key is used to deal with hash collisions in the upper 32 bits. 1385 * A unique 64 bit key is generated in-memory and may be regenerated a 1386 * second time when the directory record is flushed to the on-disk B-Tree. 1387 * 1388 * A referenced record is passed to this function. This function 1389 * eats the reference. If an error occurs the record will be deleted. 1390 * 1391 * A copy of the temporary record->data pointer provided by the caller 1392 * will be made. 1393 */ 1394 int 1395 hammer_mem_add(hammer_record_t record) 1396 { 1397 hammer_mount_t hmp = record->ip->hmp; 1398 1399 /* 1400 * Make a private copy of record->data 1401 */ 1402 if (record->data) 1403 KKASSERT(record->flags & HAMMER_RECF_ALLOCDATA); 1404 1405 /* 1406 * Insert into the RB tree. A unique key should have already 1407 * been selected if this is a directory entry. 1408 */ 1409 if (RB_INSERT(hammer_rec_rb_tree, &record->ip->rec_tree, record)) { 1410 record->flags |= HAMMER_RECF_DELETED_FE; 1411 hammer_rel_mem_record(record); 1412 return (EEXIST); 1413 } 1414 ++hmp->count_newrecords; 1415 ++hmp->rsv_recs; 1416 ++record->ip->rsv_recs; 1417 record->ip->hmp->rsv_databytes += record->leaf.data_len; 1418 record->flags |= HAMMER_RECF_ONRBTREE; 1419 hammer_modify_inode(NULL, record->ip, HAMMER_INODE_XDIRTY); 1420 hammer_rel_mem_record(record); 1421 return(0); 1422 } 1423 1424 /************************************************************************ 1425 * HAMMER INODE MERGED-RECORD FUNCTIONS * 1426 ************************************************************************ 1427 * 1428 * These functions augment the B-Tree scanning functions in hammer_btree.c 1429 * by merging in-memory records with on-disk records. 1430 */ 1431 1432 /* 1433 * Locate a particular record either in-memory or on-disk. 1434 * 1435 * NOTE: This is basically a standalone routine, hammer_ip_next() may 1436 * NOT be called to iterate results. 1437 */ 1438 int 1439 hammer_ip_lookup(hammer_cursor_t cursor) 1440 { 1441 int error; 1442 1443 /* 1444 * If the element is in-memory return it without searching the 1445 * on-disk B-Tree 1446 */ 1447 KKASSERT(cursor->ip); 1448 error = hammer_mem_lookup(cursor); 1449 if (error == 0) { 1450 cursor->leaf = &cursor->iprec->leaf; 1451 return(error); 1452 } 1453 if (error != ENOENT) 1454 return(error); 1455 1456 /* 1457 * If the inode has on-disk components search the on-disk B-Tree. 1458 */ 1459 if ((cursor->ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DONDISK)) == 0) 1460 return(error); 1461 error = hammer_btree_lookup(cursor); 1462 if (error == 0) 1463 error = hammer_btree_extract(cursor, HAMMER_CURSOR_GET_LEAF); 1464 return(error); 1465 } 1466 1467 /* 1468 * Helper for hammer_ip_first()/hammer_ip_next() 1469 * 1470 * NOTE: Both ATEDISK and DISKEOF will be set the same. This sets up 1471 * hammer_ip_first() for calling hammer_ip_next(), and sets up the re-seek 1472 * state if hammer_ip_next() needs to re-seek. 1473 */ 1474 static __inline 1475 int 1476 _hammer_ip_seek_btree(hammer_cursor_t cursor) 1477 { 1478 hammer_inode_t ip = cursor->ip; 1479 int error; 1480 1481 if (ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DONDISK)) { 1482 error = hammer_btree_lookup(cursor); 1483 if (error == ENOENT || error == EDEADLK) { 1484 if (hammer_debug_general & 0x2000) { 1485 kprintf("error %d node %p %016llx index %d\n", 1486 error, cursor->node, 1487 (long long)cursor->node->node_offset, 1488 cursor->index); 1489 } 1490 cursor->flags &= ~HAMMER_CURSOR_ATEDISK; 1491 error = hammer_btree_iterate(cursor); 1492 } 1493 if (error == 0) { 1494 cursor->flags &= ~(HAMMER_CURSOR_DISKEOF | 1495 HAMMER_CURSOR_ATEDISK); 1496 } else { 1497 cursor->flags |= HAMMER_CURSOR_DISKEOF | 1498 HAMMER_CURSOR_ATEDISK; 1499 if (error == ENOENT) 1500 error = 0; 1501 } 1502 } else { 1503 cursor->flags |= HAMMER_CURSOR_DISKEOF | HAMMER_CURSOR_ATEDISK; 1504 error = 0; 1505 } 1506 return(error); 1507 } 1508 1509 /* 1510 * Helper for hammer_ip_next() 1511 * 1512 * The caller has determined that the media cursor is further along than the 1513 * memory cursor and must be reseeked after a generation number change. 1514 */ 1515 static 1516 int 1517 _hammer_ip_reseek(hammer_cursor_t cursor) 1518 { 1519 struct hammer_base_elm save; 1520 hammer_btree_elm_t elm; 1521 int error __debugvar; 1522 int r; 1523 int again = 0; 1524 1525 /* 1526 * Do the re-seek. 1527 */ 1528 kprintf("HAMMER: Debug: re-seeked during scan @ino=%016llx\n", 1529 (long long)cursor->ip->obj_id); 1530 save = cursor->key_beg; 1531 cursor->key_beg = cursor->iprec->leaf.base; 1532 error = _hammer_ip_seek_btree(cursor); 1533 KKASSERT(error == 0); 1534 cursor->key_beg = save; 1535 1536 /* 1537 * If the memory record was previous returned to 1538 * the caller and the media record matches 1539 * (-1/+1: only create_tid differs), then iterate 1540 * the media record to avoid a double result. 1541 */ 1542 if ((cursor->flags & HAMMER_CURSOR_ATEDISK) == 0 && 1543 (cursor->flags & HAMMER_CURSOR_LASTWASMEM)) { 1544 elm = &cursor->node->ondisk->elms[cursor->index]; 1545 r = hammer_btree_cmp(&elm->base, &cursor->iprec->leaf.base); 1546 if (cursor->flags & HAMMER_CURSOR_ASOF) { 1547 if (r >= -1 && r <= 1) { 1548 kprintf("HAMMER: Debug: iterated after " 1549 "re-seek (asof r=%d)\n", r); 1550 cursor->flags |= HAMMER_CURSOR_ATEDISK; 1551 again = 1; 1552 } 1553 } else { 1554 if (r == 0) { 1555 kprintf("HAMMER: Debug: iterated after " 1556 "re-seek\n"); 1557 cursor->flags |= HAMMER_CURSOR_ATEDISK; 1558 again = 1; 1559 } 1560 } 1561 } 1562 return(again); 1563 } 1564 1565 /* 1566 * Locate the first record within the cursor's key_beg/key_end range, 1567 * restricted to a particular inode. 0 is returned on success, ENOENT 1568 * if no records matched the requested range, or some other error. 1569 * 1570 * When 0 is returned hammer_ip_next() may be used to iterate additional 1571 * records within the requested range. 1572 * 1573 * This function can return EDEADLK, requiring the caller to terminate 1574 * the cursor and try again. 1575 */ 1576 1577 int 1578 hammer_ip_first(hammer_cursor_t cursor) 1579 { 1580 hammer_inode_t ip __debugvar = cursor->ip; 1581 int error; 1582 1583 KKASSERT(ip != NULL); 1584 1585 /* 1586 * Clean up fields and setup for merged scan 1587 */ 1588 cursor->flags &= ~HAMMER_CURSOR_RETEST; 1589 1590 /* 1591 * Search the in-memory record list (Red-Black tree). Unlike the 1592 * B-Tree search, mem_first checks for records in the range. 1593 * 1594 * This function will setup both ATEMEM and MEMEOF properly for 1595 * the ip iteration. ATEMEM will be set if MEMEOF is set. 1596 */ 1597 hammer_mem_first(cursor); 1598 1599 /* 1600 * Detect generation changes during blockages, including 1601 * blockages which occur on the initial btree search. 1602 */ 1603 cursor->rec_generation = cursor->ip->rec_generation; 1604 1605 /* 1606 * Initial search and result 1607 */ 1608 error = _hammer_ip_seek_btree(cursor); 1609 if (error == 0) 1610 error = hammer_ip_next(cursor); 1611 1612 return (error); 1613 } 1614 1615 /* 1616 * Retrieve the next record in a merged iteration within the bounds of the 1617 * cursor. This call may be made multiple times after the cursor has been 1618 * initially searched with hammer_ip_first(). 1619 * 1620 * There are numerous special cases in this code to deal with races between 1621 * in-memory records and on-media records. 1622 * 1623 * 0 is returned on success, ENOENT if no further records match the 1624 * requested range, or some other error code is returned. 1625 */ 1626 int 1627 hammer_ip_next(hammer_cursor_t cursor) 1628 { 1629 hammer_btree_elm_t elm; 1630 hammer_record_t rec; 1631 hammer_record_t tmprec; 1632 int error; 1633 int r; 1634 1635 again: 1636 /* 1637 * Get the next on-disk record 1638 * 1639 * NOTE: If we deleted the last on-disk record we had scanned 1640 * ATEDISK will be clear and RETEST will be set, forcing 1641 * a call to iterate. The fact that ATEDISK is clear causes 1642 * iterate to re-test the 'current' element. If ATEDISK is 1643 * set, iterate will skip the 'current' element. 1644 */ 1645 error = 0; 1646 if ((cursor->flags & HAMMER_CURSOR_DISKEOF) == 0) { 1647 if (cursor->flags & (HAMMER_CURSOR_ATEDISK | 1648 HAMMER_CURSOR_RETEST)) { 1649 error = hammer_btree_iterate(cursor); 1650 cursor->flags &= ~HAMMER_CURSOR_RETEST; 1651 if (error == 0) { 1652 cursor->flags &= ~HAMMER_CURSOR_ATEDISK; 1653 hammer_cache_node(&cursor->ip->cache[1], 1654 cursor->node); 1655 } else if (error == ENOENT) { 1656 cursor->flags |= HAMMER_CURSOR_DISKEOF | 1657 HAMMER_CURSOR_ATEDISK; 1658 error = 0; 1659 } 1660 } 1661 } 1662 1663 /* 1664 * If the generation changed the backend has deleted or committed 1665 * one or more memory records since our last check. 1666 * 1667 * When this case occurs if the disk cursor is > current memory record 1668 * or the disk cursor is at EOF, we must re-seek the disk-cursor. 1669 * Since the cursor is ahead it must have not yet been eaten (if 1670 * not at eof anyway). (XXX data offset case?) 1671 * 1672 * NOTE: we are not doing a full check here. That will be handled 1673 * later on. 1674 * 1675 * If we have exhausted all memory records we do not have to do any 1676 * further seeks. 1677 */ 1678 while (cursor->rec_generation != cursor->ip->rec_generation && 1679 error == 0) { 1680 kprintf("HAMMER: Debug: generation changed during scan @ino=%016llx\n", (long long)cursor->ip->obj_id); 1681 cursor->rec_generation = cursor->ip->rec_generation; 1682 if (cursor->flags & HAMMER_CURSOR_MEMEOF) 1683 break; 1684 if (cursor->flags & HAMMER_CURSOR_DISKEOF) { 1685 r = 1; 1686 } else { 1687 KKASSERT((cursor->flags & HAMMER_CURSOR_ATEDISK) == 0); 1688 elm = &cursor->node->ondisk->elms[cursor->index]; 1689 r = hammer_btree_cmp(&elm->base, 1690 &cursor->iprec->leaf.base); 1691 } 1692 1693 /* 1694 * Do we re-seek the media cursor? 1695 */ 1696 if (r > 0) { 1697 if (_hammer_ip_reseek(cursor)) 1698 goto again; 1699 } 1700 } 1701 1702 /* 1703 * We can now safely get the next in-memory record. We cannot 1704 * block here. 1705 * 1706 * hammer_rec_scan_cmp: Is the record still in our general range, 1707 * (non-inclusive of snapshot exclusions)? 1708 * hammer_rec_scan_callback: Is the record in our snapshot? 1709 */ 1710 tmprec = NULL; 1711 if ((cursor->flags & HAMMER_CURSOR_MEMEOF) == 0) { 1712 /* 1713 * If the current memory record was eaten then get the next 1714 * one. Stale records are skipped. 1715 */ 1716 if (cursor->flags & HAMMER_CURSOR_ATEMEM) { 1717 tmprec = cursor->iprec; 1718 cursor->iprec = NULL; 1719 rec = hammer_rec_rb_tree_RB_NEXT(tmprec); 1720 while (rec) { 1721 if (hammer_rec_scan_cmp(rec, cursor) != 0) 1722 break; 1723 if (hammer_rec_scan_callback(rec, cursor) != 0) 1724 break; 1725 rec = hammer_rec_rb_tree_RB_NEXT(rec); 1726 } 1727 if (cursor->iprec) { 1728 KKASSERT(cursor->iprec == rec); 1729 cursor->flags &= ~HAMMER_CURSOR_ATEMEM; 1730 } else { 1731 cursor->flags |= HAMMER_CURSOR_MEMEOF; 1732 } 1733 cursor->flags &= ~HAMMER_CURSOR_LASTWASMEM; 1734 } 1735 } 1736 1737 /* 1738 * MEMORY RECORD VALIDITY TEST 1739 * 1740 * (We still can't block, which is why tmprec is being held so 1741 * long). 1742 * 1743 * If the memory record is no longer valid we skip it. It may 1744 * have been deleted by the frontend. If it was deleted or 1745 * committed by the backend the generation change re-seeked the 1746 * disk cursor and the record will be present there. 1747 */ 1748 if (error == 0 && (cursor->flags & HAMMER_CURSOR_MEMEOF) == 0) { 1749 KKASSERT(cursor->iprec); 1750 KKASSERT((cursor->flags & HAMMER_CURSOR_ATEMEM) == 0); 1751 if (!hammer_ip_iterate_mem_good(cursor, cursor->iprec)) { 1752 cursor->flags |= HAMMER_CURSOR_ATEMEM; 1753 if (tmprec) 1754 hammer_rel_mem_record(tmprec); 1755 goto again; 1756 } 1757 } 1758 if (tmprec) 1759 hammer_rel_mem_record(tmprec); 1760 1761 /* 1762 * Extract either the disk or memory record depending on their 1763 * relative position. 1764 */ 1765 error = 0; 1766 switch(cursor->flags & (HAMMER_CURSOR_ATEDISK | HAMMER_CURSOR_ATEMEM)) { 1767 case 0: 1768 /* 1769 * Both entries valid. Compare the entries and nominally 1770 * return the first one in the sort order. Numerous cases 1771 * require special attention, however. 1772 */ 1773 elm = &cursor->node->ondisk->elms[cursor->index]; 1774 r = hammer_btree_cmp(&elm->base, &cursor->iprec->leaf.base); 1775 1776 /* 1777 * If the two entries differ only by their key (-2/2) or 1778 * create_tid (-1/1), and are DATA records, we may have a 1779 * nominal match. We have to calculate the base file 1780 * offset of the data. 1781 */ 1782 if (r <= 2 && r >= -2 && r != 0 && 1783 cursor->ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE && 1784 cursor->iprec->type == HAMMER_MEM_RECORD_DATA) { 1785 int64_t base1 = elm->leaf.base.key - elm->leaf.data_len; 1786 int64_t base2 = cursor->iprec->leaf.base.key - 1787 cursor->iprec->leaf.data_len; 1788 if (base1 == base2) 1789 r = 0; 1790 } 1791 1792 if (r < 0) { 1793 error = hammer_btree_extract(cursor, 1794 HAMMER_CURSOR_GET_LEAF); 1795 cursor->flags |= HAMMER_CURSOR_ATEDISK; 1796 cursor->flags &= ~HAMMER_CURSOR_LASTWASMEM; 1797 break; 1798 } 1799 1800 /* 1801 * If the entries match exactly the memory entry is either 1802 * an on-disk directory entry deletion or a bulk data 1803 * overwrite. If it is a directory entry deletion we eat 1804 * both entries. 1805 * 1806 * For the bulk-data overwrite case it is possible to have 1807 * visibility into both, which simply means the syncer 1808 * hasn't gotten around to doing the delete+insert sequence 1809 * on the B-Tree. Use the memory entry and throw away the 1810 * on-disk entry. 1811 * 1812 * If the in-memory record is not either of these we 1813 * probably caught the syncer while it was syncing it to 1814 * the media. Since we hold a shared lock on the cursor, 1815 * the in-memory record had better be marked deleted at 1816 * this point. 1817 */ 1818 if (r == 0) { 1819 if (cursor->iprec->type == HAMMER_MEM_RECORD_DEL) { 1820 if ((cursor->flags & HAMMER_CURSOR_DELETE_VISIBILITY) == 0) { 1821 cursor->flags |= HAMMER_CURSOR_ATEDISK; 1822 cursor->flags |= HAMMER_CURSOR_ATEMEM; 1823 goto again; 1824 } 1825 } else if (cursor->iprec->type == HAMMER_MEM_RECORD_DATA) { 1826 if ((cursor->flags & HAMMER_CURSOR_DELETE_VISIBILITY) == 0) { 1827 cursor->flags |= HAMMER_CURSOR_ATEDISK; 1828 } 1829 /* fall through to memory entry */ 1830 } else { 1831 panic("hammer_ip_next: duplicate mem/b-tree entry %p %d %08x", cursor->iprec, cursor->iprec->type, cursor->iprec->flags); 1832 cursor->flags |= HAMMER_CURSOR_ATEMEM; 1833 goto again; 1834 } 1835 } 1836 /* fall through to the memory entry */ 1837 case HAMMER_CURSOR_ATEDISK: 1838 /* 1839 * Only the memory entry is valid. 1840 */ 1841 cursor->leaf = &cursor->iprec->leaf; 1842 cursor->flags |= HAMMER_CURSOR_ATEMEM; 1843 cursor->flags |= HAMMER_CURSOR_LASTWASMEM; 1844 1845 /* 1846 * If the memory entry is an on-disk deletion we should have 1847 * also had found a B-Tree record. If the backend beat us 1848 * to it it would have interlocked the cursor and we should 1849 * have seen the in-memory record marked DELETED_FE. 1850 */ 1851 if (cursor->iprec->type == HAMMER_MEM_RECORD_DEL && 1852 (cursor->flags & HAMMER_CURSOR_DELETE_VISIBILITY) == 0) { 1853 panic("hammer_ip_next: del-on-disk with no b-tree entry iprec %p flags %08x", cursor->iprec, cursor->iprec->flags); 1854 } 1855 break; 1856 case HAMMER_CURSOR_ATEMEM: 1857 /* 1858 * Only the disk entry is valid 1859 */ 1860 error = hammer_btree_extract(cursor, HAMMER_CURSOR_GET_LEAF); 1861 cursor->flags |= HAMMER_CURSOR_ATEDISK; 1862 cursor->flags &= ~HAMMER_CURSOR_LASTWASMEM; 1863 break; 1864 default: 1865 /* 1866 * Neither entry is valid 1867 * 1868 * XXX error not set properly 1869 */ 1870 cursor->flags &= ~HAMMER_CURSOR_LASTWASMEM; 1871 cursor->leaf = NULL; 1872 error = ENOENT; 1873 break; 1874 } 1875 return(error); 1876 } 1877 1878 /* 1879 * Resolve the cursor->data pointer for the current cursor position in 1880 * a merged iteration. 1881 */ 1882 int 1883 hammer_ip_resolve_data(hammer_cursor_t cursor) 1884 { 1885 hammer_record_t record; 1886 int error; 1887 1888 if (hammer_cursor_inmem(cursor)) { 1889 /* 1890 * The data associated with an in-memory record is usually 1891 * kmalloced, but reserve-ahead data records will have an 1892 * on-disk reference. 1893 * 1894 * NOTE: Reserve-ahead data records must be handled in the 1895 * context of the related high level buffer cache buffer 1896 * to interlock against async writes. 1897 */ 1898 record = cursor->iprec; 1899 cursor->data = record->data; 1900 error = 0; 1901 if (cursor->data == NULL) { 1902 KKASSERT(record->leaf.base.rec_type == 1903 HAMMER_RECTYPE_DATA); 1904 cursor->data = hammer_bread_ext(cursor->trans->hmp, 1905 record->leaf.data_offset, 1906 record->leaf.data_len, 1907 &error, 1908 &cursor->data_buffer); 1909 } 1910 } else { 1911 cursor->leaf = &cursor->node->ondisk->elms[cursor->index].leaf; 1912 error = hammer_btree_extract(cursor, HAMMER_CURSOR_GET_DATA); 1913 } 1914 return(error); 1915 } 1916 1917 /* 1918 * Backend truncation / record replacement - delete records in range. 1919 * 1920 * Delete all records within the specified range for inode ip. In-memory 1921 * records still associated with the frontend are ignored. 1922 * 1923 * If truncating is non-zero in-memory records associated with the back-end 1924 * are ignored. If truncating is > 1 we can return EWOULDBLOCK. 1925 * 1926 * NOTES: 1927 * 1928 * * An unaligned range will cause new records to be added to cover 1929 * the edge cases. (XXX not implemented yet). 1930 * 1931 * * Replacement via reservations (see hammer_ip_sync_record_cursor()) 1932 * also do not deal with unaligned ranges. 1933 * 1934 * * ran_end is inclusive (e.g. 0,1023 instead of 0,1024). 1935 * 1936 * * Record keys for regular file data have to be special-cased since 1937 * they indicate the end of the range (key = base + bytes). 1938 * 1939 * * This function may be asked to delete ridiculously huge ranges, for 1940 * example if someone truncates or removes a 1TB regular file. We 1941 * must be very careful on restarts and we may have to stop w/ 1942 * EWOULDBLOCK to avoid blowing out the buffer cache. 1943 */ 1944 int 1945 hammer_ip_delete_range(hammer_cursor_t cursor, hammer_inode_t ip, 1946 int64_t ran_beg, int64_t ran_end, int truncating) 1947 { 1948 hammer_transaction_t trans = cursor->trans; 1949 hammer_btree_leaf_elm_t leaf; 1950 int error; 1951 int64_t off; 1952 int64_t tmp64; 1953 1954 #if 0 1955 kprintf("delete_range %p %016llx-%016llx\n", ip, ran_beg, ran_end); 1956 #endif 1957 1958 KKASSERT(trans->type == HAMMER_TRANS_FLS); 1959 retry: 1960 hammer_normalize_cursor(cursor); 1961 cursor->key_beg.localization = ip->obj_localization + 1962 HAMMER_LOCALIZE_MISC; 1963 cursor->key_beg.obj_id = ip->obj_id; 1964 cursor->key_beg.create_tid = 0; 1965 cursor->key_beg.delete_tid = 0; 1966 cursor->key_beg.obj_type = 0; 1967 1968 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { 1969 cursor->key_beg.key = ran_beg; 1970 cursor->key_beg.rec_type = HAMMER_RECTYPE_DB; 1971 } else { 1972 /* 1973 * The key in the B-Tree is (base+bytes), so the first possible 1974 * matching key is ran_beg + 1. 1975 */ 1976 cursor->key_beg.key = ran_beg + 1; 1977 cursor->key_beg.rec_type = HAMMER_RECTYPE_DATA; 1978 } 1979 1980 cursor->key_end = cursor->key_beg; 1981 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { 1982 cursor->key_end.key = ran_end; 1983 } else { 1984 tmp64 = ran_end + MAXPHYS + 1; /* work around GCC-4 bug */ 1985 if (tmp64 < ran_end) 1986 cursor->key_end.key = 0x7FFFFFFFFFFFFFFFLL; 1987 else 1988 cursor->key_end.key = ran_end + MAXPHYS + 1; 1989 } 1990 1991 cursor->asof = ip->obj_asof; 1992 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1993 cursor->flags |= HAMMER_CURSOR_ASOF; 1994 cursor->flags |= HAMMER_CURSOR_DELETE_VISIBILITY; 1995 cursor->flags |= HAMMER_CURSOR_BACKEND; 1996 cursor->flags |= HAMMER_CURSOR_END_INCLUSIVE; 1997 1998 error = hammer_ip_first(cursor); 1999 2000 /* 2001 * Iterate through matching records and mark them as deleted. 2002 */ 2003 while (error == 0) { 2004 leaf = cursor->leaf; 2005 2006 KKASSERT(leaf->base.delete_tid == 0); 2007 KKASSERT(leaf->base.obj_id == ip->obj_id); 2008 2009 /* 2010 * There may be overlap cases for regular file data. Also 2011 * remember the key for a regular file record is (base + len), 2012 * NOT (base). 2013 * 2014 * Note that due to duplicates (mem & media) allowed by 2015 * DELETE_VISIBILITY, off can wind up less then ran_beg. 2016 */ 2017 if (leaf->base.rec_type == HAMMER_RECTYPE_DATA) { 2018 off = leaf->base.key - leaf->data_len; 2019 /* 2020 * Check the left edge case. We currently do not 2021 * split existing records. 2022 */ 2023 if (off < ran_beg && leaf->base.key > ran_beg) { 2024 panic("hammer left edge case %016llx %d", 2025 (long long)leaf->base.key, 2026 leaf->data_len); 2027 } 2028 2029 /* 2030 * Check the right edge case. Note that the 2031 * record can be completely out of bounds, which 2032 * terminates the search. 2033 * 2034 * base->key is exclusive of the right edge while 2035 * ran_end is inclusive of the right edge. The 2036 * (key - data_len) left boundary is inclusive. 2037 * 2038 * XXX theory-check this test at some point, are 2039 * we missing a + 1 somewhere? Note that ran_end 2040 * could overflow. 2041 */ 2042 if (leaf->base.key - 1 > ran_end) { 2043 if (leaf->base.key - leaf->data_len > ran_end) 2044 break; 2045 panic("hammer right edge case"); 2046 } 2047 } else { 2048 off = leaf->base.key; 2049 } 2050 2051 /* 2052 * Delete the record. When truncating we do not delete 2053 * in-memory (data) records because they represent data 2054 * written after the truncation. 2055 * 2056 * This will also physically destroy the B-Tree entry and 2057 * data if the retention policy dictates. The function 2058 * will set HAMMER_CURSOR_RETEST to cause hammer_ip_next() 2059 * to retest the new 'current' element. 2060 */ 2061 if (truncating == 0 || hammer_cursor_ondisk(cursor)) { 2062 error = hammer_ip_delete_record(cursor, ip, trans->tid); 2063 /* 2064 * If we have built up too many meta-buffers we risk 2065 * deadlocking the kernel and must stop. This can 2066 * occur when deleting ridiculously huge files. 2067 * sync_trunc_off is updated so the next cycle does 2068 * not re-iterate records we have already deleted. 2069 * 2070 * This is only done with formal truncations. 2071 */ 2072 if (truncating > 1 && error == 0 && 2073 hammer_flusher_meta_limit(ip->hmp)) { 2074 ip->sync_trunc_off = off; 2075 error = EWOULDBLOCK; 2076 } 2077 } 2078 if (error) 2079 break; 2080 ran_beg = off; /* for restart */ 2081 error = hammer_ip_next(cursor); 2082 } 2083 if (cursor->node) 2084 hammer_cache_node(&ip->cache[1], cursor->node); 2085 2086 if (error == EDEADLK) { 2087 hammer_done_cursor(cursor); 2088 error = hammer_init_cursor(trans, cursor, &ip->cache[1], ip); 2089 if (error == 0) 2090 goto retry; 2091 } 2092 if (error == ENOENT) 2093 error = 0; 2094 return(error); 2095 } 2096 2097 /* 2098 * This backend function deletes the specified record on-disk, similar to 2099 * delete_range but for a specific record. Unlike the exact deletions 2100 * used when deleting a directory entry this function uses an ASOF search 2101 * like delete_range. 2102 * 2103 * This function may be called with ip->obj_asof set for a slave snapshot, 2104 * so don't use it. We always delete non-historical records only. 2105 */ 2106 static int 2107 hammer_delete_general(hammer_cursor_t cursor, hammer_inode_t ip, 2108 hammer_btree_leaf_elm_t leaf) 2109 { 2110 hammer_transaction_t trans = cursor->trans; 2111 int error; 2112 2113 KKASSERT(trans->type == HAMMER_TRANS_FLS); 2114 retry: 2115 hammer_normalize_cursor(cursor); 2116 cursor->key_beg = leaf->base; 2117 cursor->asof = HAMMER_MAX_TID; 2118 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 2119 cursor->flags |= HAMMER_CURSOR_ASOF; 2120 cursor->flags |= HAMMER_CURSOR_BACKEND; 2121 cursor->flags &= ~HAMMER_CURSOR_INSERT; 2122 2123 error = hammer_btree_lookup(cursor); 2124 if (error == 0) { 2125 error = hammer_ip_delete_record(cursor, ip, trans->tid); 2126 } 2127 if (error == EDEADLK) { 2128 hammer_done_cursor(cursor); 2129 error = hammer_init_cursor(trans, cursor, &ip->cache[1], ip); 2130 if (error == 0) 2131 goto retry; 2132 } 2133 return(error); 2134 } 2135 2136 /* 2137 * This function deletes remaining auxillary records when an inode is 2138 * being deleted. This function explicitly does not delete the 2139 * inode record, directory entry, data, or db records. Those must be 2140 * properly disposed of prior to this call. 2141 */ 2142 int 2143 hammer_ip_delete_clean(hammer_cursor_t cursor, hammer_inode_t ip, int *countp) 2144 { 2145 hammer_transaction_t trans = cursor->trans; 2146 hammer_btree_leaf_elm_t leaf __debugvar; 2147 int error; 2148 2149 KKASSERT(trans->type == HAMMER_TRANS_FLS); 2150 retry: 2151 hammer_normalize_cursor(cursor); 2152 cursor->key_beg.localization = ip->obj_localization + 2153 HAMMER_LOCALIZE_MISC; 2154 cursor->key_beg.obj_id = ip->obj_id; 2155 cursor->key_beg.create_tid = 0; 2156 cursor->key_beg.delete_tid = 0; 2157 cursor->key_beg.obj_type = 0; 2158 cursor->key_beg.rec_type = HAMMER_RECTYPE_CLEAN_START; 2159 cursor->key_beg.key = HAMMER_MIN_KEY; 2160 2161 cursor->key_end = cursor->key_beg; 2162 cursor->key_end.rec_type = HAMMER_RECTYPE_MAX; 2163 cursor->key_end.key = HAMMER_MAX_KEY; 2164 2165 cursor->asof = ip->obj_asof; 2166 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 2167 cursor->flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 2168 cursor->flags |= HAMMER_CURSOR_DELETE_VISIBILITY; 2169 cursor->flags |= HAMMER_CURSOR_BACKEND; 2170 2171 error = hammer_ip_first(cursor); 2172 2173 /* 2174 * Iterate through matching records and mark them as deleted. 2175 */ 2176 while (error == 0) { 2177 leaf = cursor->leaf; 2178 2179 KKASSERT(leaf->base.delete_tid == 0); 2180 2181 /* 2182 * Mark the record and B-Tree entry as deleted. This will 2183 * also physically delete the B-Tree entry, record, and 2184 * data if the retention policy dictates. The function 2185 * will set HAMMER_CURSOR_RETEST to cause hammer_ip_next() 2186 * to retest the new 'current' element. 2187 * 2188 * Directory entries (and delete-on-disk directory entries) 2189 * must be synced and cannot be deleted. 2190 */ 2191 error = hammer_ip_delete_record(cursor, ip, trans->tid); 2192 ++*countp; 2193 if (error) 2194 break; 2195 error = hammer_ip_next(cursor); 2196 } 2197 if (cursor->node) 2198 hammer_cache_node(&ip->cache[1], cursor->node); 2199 if (error == EDEADLK) { 2200 hammer_done_cursor(cursor); 2201 error = hammer_init_cursor(trans, cursor, &ip->cache[1], ip); 2202 if (error == 0) 2203 goto retry; 2204 } 2205 if (error == ENOENT) 2206 error = 0; 2207 return(error); 2208 } 2209 2210 /* 2211 * Delete the record at the current cursor. On success the cursor will 2212 * be positioned appropriately for an iteration but may no longer be at 2213 * a leaf node. 2214 * 2215 * This routine is only called from the backend. 2216 * 2217 * NOTE: This can return EDEADLK, requiring the caller to terminate the 2218 * cursor and retry. 2219 */ 2220 int 2221 hammer_ip_delete_record(hammer_cursor_t cursor, hammer_inode_t ip, 2222 hammer_tid_t tid) 2223 { 2224 hammer_record_t iprec; 2225 int error; 2226 2227 KKASSERT(cursor->flags & HAMMER_CURSOR_BACKEND); 2228 KKASSERT(tid != 0); 2229 2230 /* 2231 * In-memory (unsynchronized) records can simply be freed. This 2232 * only occurs in range iterations since all other records are 2233 * individually synchronized. Thus there should be no confusion with 2234 * the interlock. 2235 * 2236 * An in-memory record may be deleted before being committed to disk, 2237 * but could have been accessed in the mean time. The reservation 2238 * code will deal with the case. 2239 */ 2240 if (hammer_cursor_inmem(cursor)) { 2241 iprec = cursor->iprec; 2242 KKASSERT((iprec->flags & HAMMER_RECF_INTERLOCK_BE) ==0); 2243 iprec->flags |= HAMMER_RECF_DELETED_FE; 2244 iprec->flags |= HAMMER_RECF_DELETED_BE; 2245 KKASSERT(iprec->ip == ip); 2246 ++ip->rec_generation; 2247 return(0); 2248 } 2249 2250 /* 2251 * On-disk records are marked as deleted by updating their delete_tid. 2252 * This does not effect their position in the B-Tree (which is based 2253 * on their create_tid). 2254 * 2255 * Frontend B-Tree operations track inodes so we tell 2256 * hammer_delete_at_cursor() not to. 2257 */ 2258 error = hammer_btree_extract(cursor, HAMMER_CURSOR_GET_LEAF); 2259 2260 if (error == 0) { 2261 error = hammer_delete_at_cursor( 2262 cursor, 2263 HAMMER_DELETE_ADJUST | hammer_nohistory(ip), 2264 cursor->trans->tid, 2265 cursor->trans->time32, 2266 0, NULL); 2267 } 2268 return(error); 2269 } 2270 2271 /* 2272 * Used to write a generic record w/optional data to the media b-tree 2273 * when no inode context is available. Used by the mirroring and 2274 * snapshot code. 2275 * 2276 * Caller must set cursor->key_beg to leaf->base. The cursor must be 2277 * flagged for backend operation and not flagged ASOF (since we are 2278 * doing an insertion). 2279 * 2280 * This function will acquire the appropriate sync lock and will set 2281 * the cursor insertion flag for the operation, do the btree lookup, 2282 * and the insertion, and clear the insertion flag and sync lock before 2283 * returning. The cursor state will be such that the caller can continue 2284 * scanning (used by the mirroring code). 2285 * 2286 * mode: HAMMER_CREATE_MODE_UMIRROR copyin data, check crc 2287 * HAMMER_CREATE_MODE_SYS bcopy data, generate crc 2288 * 2289 * NOTE: EDEADLK can be returned. The caller must do deadlock handling and 2290 * retry. 2291 * 2292 * EALREADY can be returned if the record already exists (WARNING, 2293 * because ASOF cannot be used no check is made for illegal 2294 * duplicates). 2295 * 2296 * NOTE: Do not use the function for normal inode-related records as this 2297 * functions goes directly to the media and is not integrated with 2298 * in-memory records. 2299 */ 2300 int 2301 hammer_create_at_cursor(hammer_cursor_t cursor, hammer_btree_leaf_elm_t leaf, 2302 void *udata, int mode) 2303 { 2304 hammer_transaction_t trans; 2305 hammer_buffer_t data_buffer; 2306 hammer_off_t ndata_offset; 2307 hammer_tid_t high_tid; 2308 void *ndata; 2309 int error; 2310 int doprop; 2311 2312 trans = cursor->trans; 2313 data_buffer = NULL; 2314 ndata_offset = 0; 2315 doprop = 0; 2316 2317 KKASSERT((cursor->flags & 2318 (HAMMER_CURSOR_BACKEND | HAMMER_CURSOR_ASOF)) == 2319 (HAMMER_CURSOR_BACKEND)); 2320 2321 hammer_sync_lock_sh(trans); 2322 2323 if (leaf->data_len) { 2324 ndata = hammer_alloc_data(trans, leaf->data_len, 2325 leaf->base.rec_type, 2326 &ndata_offset, &data_buffer, 2327 0, &error); 2328 if (ndata == NULL) { 2329 hammer_sync_unlock(trans); 2330 return (error); 2331 } 2332 leaf->data_offset = ndata_offset; 2333 hammer_modify_buffer_noundo(trans, data_buffer); 2334 2335 switch(mode) { 2336 case HAMMER_CREATE_MODE_UMIRROR: 2337 error = copyin(udata, ndata, leaf->data_len); 2338 if (error == 0) { 2339 if (hammer_crc_test_leaf(ndata, leaf) == 0) { 2340 kprintf("data crc mismatch on pipe\n"); 2341 error = EINVAL; 2342 } else { 2343 error = hammer_cursor_localize_data( 2344 ndata, leaf); 2345 } 2346 } 2347 break; 2348 case HAMMER_CREATE_MODE_SYS: 2349 bcopy(udata, ndata, leaf->data_len); 2350 error = 0; 2351 hammer_crc_set_leaf(ndata, leaf); 2352 break; 2353 default: 2354 panic("HAMMER: hammer_create_at_cursor: bad mode %d", 2355 mode); 2356 break; /* NOT REACHED */ 2357 } 2358 hammer_modify_buffer_done(data_buffer); 2359 } else { 2360 leaf->data_offset = 0; 2361 error = 0; 2362 ndata = NULL; 2363 } 2364 if (error) 2365 goto failed; 2366 2367 /* 2368 * Do the insertion. This can fail with a EDEADLK or EALREADY 2369 */ 2370 cursor->flags |= HAMMER_CURSOR_INSERT; 2371 error = hammer_btree_lookup(cursor); 2372 if (error != ENOENT) { 2373 if (error == 0) 2374 error = EALREADY; 2375 goto failed; 2376 } 2377 error = hammer_btree_insert(cursor, leaf, &doprop); 2378 2379 /* 2380 * Cursor is left on current element, we want to skip it now. 2381 * (in case the caller is scanning) 2382 */ 2383 cursor->flags |= HAMMER_CURSOR_ATEDISK; 2384 cursor->flags &= ~HAMMER_CURSOR_INSERT; 2385 2386 /* 2387 * If the insertion happens to be creating (and not just replacing) 2388 * an inode we have to track it. 2389 */ 2390 if (error == 0 && 2391 leaf->base.rec_type == HAMMER_RECTYPE_INODE && 2392 leaf->base.delete_tid == 0) { 2393 hammer_modify_volume_field(trans, trans->rootvol, 2394 vol0_stat_inodes); 2395 ++trans->hmp->rootvol->ondisk->vol0_stat_inodes; 2396 hammer_modify_volume_done(trans->rootvol); 2397 } 2398 2399 /* 2400 * vol0_next_tid must track the highest TID stored in the filesystem. 2401 * We do not need to generate undo for this update. 2402 */ 2403 high_tid = leaf->base.create_tid; 2404 if (high_tid < leaf->base.delete_tid) 2405 high_tid = leaf->base.delete_tid; 2406 if (trans->rootvol->ondisk->vol0_next_tid < high_tid) { 2407 hammer_modify_volume_noundo(trans, trans->rootvol); 2408 trans->rootvol->ondisk->vol0_next_tid = high_tid; 2409 hammer_modify_volume_done(trans->rootvol); 2410 } 2411 2412 /* 2413 * WARNING! cursor's leaf pointer may have changed after 2414 * do_propagation returns. 2415 */ 2416 if (error == 0 && doprop) 2417 hammer_btree_do_propagation(cursor, NULL, leaf); 2418 2419 failed: 2420 /* 2421 * Cleanup 2422 */ 2423 if (error && leaf->data_offset) { 2424 hammer_blockmap_free(trans, leaf->data_offset, leaf->data_len); 2425 2426 } 2427 hammer_sync_unlock(trans); 2428 if (data_buffer) 2429 hammer_rel_buffer(data_buffer, 0); 2430 return (error); 2431 } 2432 2433 /* 2434 * Delete the B-Tree element at the current cursor and do any necessary 2435 * mirror propagation. 2436 * 2437 * The cursor must be properly positioned for an iteration on return but 2438 * may be pointing at an internal element. 2439 * 2440 * An element can be un-deleted by passing a delete_tid of 0 with 2441 * HAMMER_DELETE_ADJUST. 2442 * 2443 * This function will store the number of bytes deleted in *stat_bytes 2444 * if stat_bytes is not NULL. 2445 */ 2446 int 2447 hammer_delete_at_cursor(hammer_cursor_t cursor, int delete_flags, 2448 hammer_tid_t delete_tid, u_int32_t delete_ts, 2449 int track, int64_t *stat_bytes) 2450 { 2451 struct hammer_btree_leaf_elm save_leaf; 2452 hammer_transaction_t trans; 2453 hammer_btree_leaf_elm_t leaf; 2454 hammer_node_t node; 2455 hammer_btree_elm_t elm; 2456 hammer_off_t data_offset; 2457 int32_t data_len; 2458 int64_t bytes; 2459 int ndelete; 2460 int error; 2461 int icount; 2462 int doprop; 2463 2464 error = hammer_cursor_upgrade(cursor); 2465 if (error) 2466 return(error); 2467 2468 trans = cursor->trans; 2469 node = cursor->node; 2470 elm = &node->ondisk->elms[cursor->index]; 2471 leaf = &elm->leaf; 2472 KKASSERT(elm->base.btype == HAMMER_BTREE_TYPE_RECORD); 2473 2474 hammer_sync_lock_sh(trans); 2475 bytes = 0; 2476 doprop = 0; 2477 icount = 0; 2478 2479 /* 2480 * Adjust the delete_tid. Update the mirror_tid propagation field 2481 * as well. delete_tid can be 0 (undelete -- used by mirroring). 2482 */ 2483 if (delete_flags & HAMMER_DELETE_ADJUST) { 2484 if (elm->base.rec_type == HAMMER_RECTYPE_INODE) { 2485 if (elm->leaf.base.delete_tid == 0 && delete_tid) 2486 icount = -1; 2487 if (elm->leaf.base.delete_tid && delete_tid == 0) 2488 icount = 1; 2489 } 2490 2491 hammer_modify_node(trans, node, elm, sizeof(*elm)); 2492 elm->leaf.base.delete_tid = delete_tid; 2493 elm->leaf.delete_ts = delete_ts; 2494 hammer_modify_node_done(node); 2495 2496 if (elm->leaf.base.delete_tid > node->ondisk->mirror_tid) { 2497 hammer_modify_node_field(trans, node, mirror_tid); 2498 node->ondisk->mirror_tid = elm->leaf.base.delete_tid; 2499 hammer_modify_node_done(node); 2500 doprop = 1; 2501 if (hammer_debug_general & 0x0002) { 2502 kprintf("delete_at_cursor: propagate %016llx" 2503 " @%016llx\n", 2504 (long long)elm->leaf.base.delete_tid, 2505 (long long)node->node_offset); 2506 } 2507 } 2508 2509 /* 2510 * Adjust for the iteration. We have deleted the current 2511 * element and want to clear ATEDISK so the iteration does 2512 * not skip the element after, which now becomes the current 2513 * element. This element must be re-tested if doing an 2514 * iteration, which is handled by the RETEST flag. 2515 */ 2516 if ((cursor->flags & HAMMER_CURSOR_DISKEOF) == 0) { 2517 cursor->flags |= HAMMER_CURSOR_RETEST; 2518 cursor->flags &= ~HAMMER_CURSOR_ATEDISK; 2519 } 2520 2521 /* 2522 * An on-disk record cannot have the same delete_tid 2523 * as its create_tid. In a chain of record updates 2524 * this could result in a duplicate record. 2525 */ 2526 KKASSERT(elm->leaf.base.delete_tid != 2527 elm->leaf.base.create_tid); 2528 } 2529 2530 /* 2531 * Destroy the B-Tree element if asked (typically if a nohistory 2532 * file or mount, or when called by the pruning code). 2533 * 2534 * Adjust the ATEDISK flag to properly support iterations. 2535 */ 2536 if (delete_flags & HAMMER_DELETE_DESTROY) { 2537 data_offset = elm->leaf.data_offset; 2538 data_len = elm->leaf.data_len; 2539 if (doprop) { 2540 save_leaf = elm->leaf; 2541 leaf = &save_leaf; 2542 } 2543 if (elm->base.rec_type == HAMMER_RECTYPE_INODE && 2544 elm->leaf.base.delete_tid == 0) { 2545 icount = -1; 2546 } 2547 2548 error = hammer_btree_delete(cursor, &ndelete); 2549 if (error == 0) { 2550 /* 2551 * The deletion moves the next element (if any) to 2552 * the current element position. We must clear 2553 * ATEDISK so this element is not skipped and we 2554 * must set RETEST to force any iteration to re-test 2555 * the element. 2556 */ 2557 if ((cursor->flags & HAMMER_CURSOR_DISKEOF) == 0) { 2558 cursor->flags |= HAMMER_CURSOR_RETEST; 2559 cursor->flags &= ~HAMMER_CURSOR_ATEDISK; 2560 } 2561 bytes += (ndelete * sizeof(struct hammer_node_ondisk)); 2562 2563 switch(data_offset & HAMMER_OFF_ZONE_MASK) { 2564 case HAMMER_ZONE_LARGE_DATA: 2565 case HAMMER_ZONE_SMALL_DATA: 2566 case HAMMER_ZONE_META: 2567 hammer_blockmap_free(trans, 2568 data_offset, data_len); 2569 bytes += data_len; 2570 break; 2571 default: 2572 break; 2573 } 2574 } 2575 } 2576 2577 /* 2578 * Track inode count and next_tid. This is used by the mirroring 2579 * and PFS code. icount can be negative, zero, or positive. 2580 */ 2581 if (error == 0 && track) { 2582 if (icount) { 2583 hammer_modify_volume_field(trans, trans->rootvol, 2584 vol0_stat_inodes); 2585 trans->rootvol->ondisk->vol0_stat_inodes += icount; 2586 hammer_modify_volume_done(trans->rootvol); 2587 } 2588 if (trans->rootvol->ondisk->vol0_next_tid < delete_tid) { 2589 hammer_modify_volume_noundo(trans, trans->rootvol); 2590 trans->rootvol->ondisk->vol0_next_tid = delete_tid; 2591 hammer_modify_volume_done(trans->rootvol); 2592 } 2593 } 2594 2595 /* 2596 * mirror_tid propagation occurs if the node's mirror_tid had to be 2597 * updated while adjusting the delete_tid. 2598 * 2599 * This occurs when deleting even in nohistory mode, but does not 2600 * occur when pruning an already-deleted node. 2601 * 2602 * cursor->ip is NULL when called from the pruning, mirroring, 2603 * and pfs code. If non-NULL propagation will be conditionalized 2604 * on whether the PFS is in no-history mode or not. 2605 * 2606 * WARNING: cursor's leaf pointer may have changed after do_propagation 2607 * returns! 2608 */ 2609 if (doprop) { 2610 if (cursor->ip) 2611 hammer_btree_do_propagation(cursor, cursor->ip->pfsm, leaf); 2612 else 2613 hammer_btree_do_propagation(cursor, NULL, leaf); 2614 } 2615 if (stat_bytes) 2616 *stat_bytes = bytes; 2617 hammer_sync_unlock(trans); 2618 return (error); 2619 } 2620 2621 /* 2622 * Determine whether we can remove a directory. This routine checks whether 2623 * a directory is empty or not and enforces flush connectivity. 2624 * 2625 * Flush connectivity requires that we block if the target directory is 2626 * currently flushing, otherwise it may not end up in the same flush group. 2627 * 2628 * Returns 0 on success, ENOTEMPTY or EDEADLK (or other errors) on failure. 2629 */ 2630 int 2631 hammer_ip_check_directory_empty(hammer_transaction_t trans, hammer_inode_t ip) 2632 { 2633 struct hammer_cursor cursor; 2634 int error; 2635 2636 /* 2637 * Check directory empty 2638 */ 2639 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 2640 2641 cursor.key_beg.localization = ip->obj_localization + 2642 hammer_dir_localization(ip); 2643 cursor.key_beg.obj_id = ip->obj_id; 2644 cursor.key_beg.create_tid = 0; 2645 cursor.key_beg.delete_tid = 0; 2646 cursor.key_beg.obj_type = 0; 2647 cursor.key_beg.rec_type = HAMMER_RECTYPE_ENTRY_START; 2648 cursor.key_beg.key = HAMMER_MIN_KEY; 2649 2650 cursor.key_end = cursor.key_beg; 2651 cursor.key_end.rec_type = HAMMER_RECTYPE_MAX; 2652 cursor.key_end.key = HAMMER_MAX_KEY; 2653 2654 cursor.asof = ip->obj_asof; 2655 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; 2656 2657 error = hammer_ip_first(&cursor); 2658 if (error == ENOENT) 2659 error = 0; 2660 else if (error == 0) 2661 error = ENOTEMPTY; 2662 hammer_done_cursor(&cursor); 2663 return(error); 2664 } 2665 2666 /* 2667 * Localize the data payload. Directory entries may need their 2668 * localization adjusted. 2669 */ 2670 static 2671 int 2672 hammer_cursor_localize_data(hammer_data_ondisk_t data, 2673 hammer_btree_leaf_elm_t leaf) 2674 { 2675 u_int32_t localization; 2676 2677 if (leaf->base.rec_type == HAMMER_RECTYPE_DIRENTRY) { 2678 localization = leaf->base.localization & 2679 HAMMER_LOCALIZE_PSEUDOFS_MASK; 2680 if (data->entry.localization != localization) { 2681 data->entry.localization = localization; 2682 hammer_crc_set_leaf(data, leaf); 2683 } 2684 } 2685 return(0); 2686 } 2687