1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25#include <sys/zfs_context.h> 26#include <sys/dbuf.h> 27#include <sys/dnode.h> 28#include <sys/dmu.h> 29#include <sys/dmu_tx.h> 30#include <sys/dmu_objset.h> 31#include <sys/dsl_dataset.h> 32#include <sys/spa.h> 33 34static void 35dnode_increase_indirection(dnode_t *dn, dmu_tx_t *tx) 36{ 37 dmu_buf_impl_t *db; 38 int txgoff = tx->tx_txg & TXG_MASK; 39 int nblkptr = dn->dn_phys->dn_nblkptr; 40 int old_toplvl = dn->dn_phys->dn_nlevels - 1; 41 int new_level = dn->dn_next_nlevels[txgoff]; 42 int i; 43 44 rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 45 46 /* this dnode can't be paged out because it's dirty */ 47 ASSERT(dn->dn_phys->dn_type != DMU_OT_NONE); 48 ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 49 ASSERT(new_level > 1 && dn->dn_phys->dn_nlevels > 0); 50 51 db = dbuf_hold_level(dn, dn->dn_phys->dn_nlevels, 0, FTAG); 52 ASSERT(db != NULL); 53 54 dn->dn_phys->dn_nlevels = new_level; 55 dprintf("os=%p obj=%llu, increase to %d\n", dn->dn_objset, 56 dn->dn_object, dn->dn_phys->dn_nlevels); 57 58 /* check for existing blkptrs in the dnode */ 59 for (i = 0; i < nblkptr; i++) 60 if (!BP_IS_HOLE(&dn->dn_phys->dn_blkptr[i])) 61 break; 62 if (i != nblkptr) { 63 /* transfer dnode's block pointers to new indirect block */ 64 (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED|DB_RF_HAVESTRUCT); 65 ASSERT(db->db.db_data); 66 ASSERT(arc_released(db->db_buf)); 67 ASSERT3U(sizeof (blkptr_t) * nblkptr, <=, db->db.db_size); 68 bcopy(dn->dn_phys->dn_blkptr, db->db.db_data, 69 sizeof (blkptr_t) * nblkptr); 70 arc_buf_freeze(db->db_buf); 71 } 72 73 /* set dbuf's parent pointers to new indirect buf */ 74 for (i = 0; i < nblkptr; i++) { 75 dmu_buf_impl_t *child = dbuf_find(dn, old_toplvl, i); 76 77 if (child == NULL) 78 continue; 79#ifdef DEBUG 80 DB_DNODE_ENTER(child); 81 ASSERT3P(DB_DNODE(child), ==, dn); 82 DB_DNODE_EXIT(child); 83#endif /* DEBUG */ 84 if (child->db_parent && child->db_parent != dn->dn_dbuf) { 85 ASSERT(child->db_parent->db_level == db->db_level); 86 ASSERT(child->db_blkptr != 87 &dn->dn_phys->dn_blkptr[child->db_blkid]); 88 mutex_exit(&child->db_mtx); 89 continue; 90 } 91 ASSERT(child->db_parent == NULL || 92 child->db_parent == dn->dn_dbuf); 93 94 child->db_parent = db; 95 dbuf_add_ref(db, child); 96 if (db->db.db_data) 97 child->db_blkptr = (blkptr_t *)db->db.db_data + i; 98 else 99 child->db_blkptr = NULL; 100 dprintf_dbuf_bp(child, child->db_blkptr, 101 "changed db_blkptr to new indirect %s", ""); 102 103 mutex_exit(&child->db_mtx); 104 } 105 106 bzero(dn->dn_phys->dn_blkptr, sizeof (blkptr_t) * nblkptr); 107 108 dbuf_rele(db, FTAG); 109 110 rw_exit(&dn->dn_struct_rwlock); 111} 112 113static int 114free_blocks(dnode_t *dn, blkptr_t *bp, int num, dmu_tx_t *tx) 115{ 116 dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 117 uint64_t bytesfreed = 0; 118 int i, blocks_freed = 0; 119 120 dprintf("ds=%p obj=%llx num=%d\n", ds, dn->dn_object, num); 121 122 for (i = 0; i < num; i++, bp++) { 123 if (BP_IS_HOLE(bp)) 124 continue; 125 126 bytesfreed += dsl_dataset_block_kill(ds, bp, tx, B_FALSE); 127 ASSERT3U(bytesfreed, <=, DN_USED_BYTES(dn->dn_phys)); 128 bzero(bp, sizeof (blkptr_t)); 129 blocks_freed += 1; 130 } 131 dnode_diduse_space(dn, -bytesfreed); 132 return (blocks_freed); 133} 134 135#ifdef ZFS_DEBUG 136static void 137free_verify(dmu_buf_impl_t *db, uint64_t start, uint64_t end, dmu_tx_t *tx) 138{ 139 int off, num; 140 int i, err, epbs; 141 uint64_t txg = tx->tx_txg; 142 dnode_t *dn; 143 144 DB_DNODE_ENTER(db); 145 dn = DB_DNODE(db); 146 epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 147 off = start - (db->db_blkid * 1<<epbs); 148 num = end - start + 1; 149 150 ASSERT3U(off, >=, 0); 151 ASSERT3U(num, >=, 0); 152 ASSERT3U(db->db_level, >, 0); 153 ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift); 154 ASSERT3U(off+num, <=, db->db.db_size >> SPA_BLKPTRSHIFT); 155 ASSERT(db->db_blkptr != NULL); 156 157 for (i = off; i < off+num; i++) { 158 uint64_t *buf; 159 dmu_buf_impl_t *child; 160 dbuf_dirty_record_t *dr; 161 int j; 162 163 ASSERT(db->db_level == 1); 164 165 rw_enter(&dn->dn_struct_rwlock, RW_READER); 166 err = dbuf_hold_impl(dn, db->db_level-1, 167 (db->db_blkid << epbs) + i, TRUE, FTAG, &child); 168 rw_exit(&dn->dn_struct_rwlock); 169 if (err == ENOENT) 170 continue; 171 ASSERT(err == 0); 172 ASSERT(child->db_level == 0); 173 dr = child->db_last_dirty; 174 while (dr && dr->dr_txg > txg) 175 dr = dr->dr_next; 176 ASSERT(dr == NULL || dr->dr_txg == txg); 177 178 /* data_old better be zeroed */ 179 if (dr) { 180 buf = dr->dt.dl.dr_data->b_data; 181 for (j = 0; j < child->db.db_size >> 3; j++) { 182 if (buf[j] != 0) { 183 panic("freed data not zero: " 184 "child=%p i=%d off=%d num=%d\n", 185 (void *)child, i, off, num); 186 } 187 } 188 } 189 190 /* 191 * db_data better be zeroed unless it's dirty in a 192 * future txg. 193 */ 194 mutex_enter(&child->db_mtx); 195 buf = child->db.db_data; 196 if (buf != NULL && child->db_state != DB_FILL && 197 child->db_last_dirty == NULL) { 198 for (j = 0; j < child->db.db_size >> 3; j++) { 199 if (buf[j] != 0) { 200 panic("freed data not zero: " 201 "child=%p i=%d off=%d num=%d\n", 202 (void *)child, i, off, num); 203 } 204 } 205 } 206 mutex_exit(&child->db_mtx); 207 208 dbuf_rele(child, FTAG); 209 } 210 DB_DNODE_EXIT(db); 211} 212#endif 213 214#define ALL -1 215 216static int 217free_children(dmu_buf_impl_t *db, uint64_t blkid, uint64_t nblks, int trunc, 218 dmu_tx_t *tx) 219{ 220 dnode_t *dn; 221 blkptr_t *bp; 222 dmu_buf_impl_t *subdb; 223 uint64_t start, end, dbstart, dbend, i; 224 int epbs, shift, err; 225 int all = TRUE; 226 int blocks_freed = 0; 227 228 /* 229 * There is a small possibility that this block will not be cached: 230 * 1 - if level > 1 and there are no children with level <= 1 231 * 2 - if we didn't get a dirty hold (because this block had just 232 * finished being written -- and so had no holds), and then this 233 * block got evicted before we got here. 234 */ 235 if (db->db_state != DB_CACHED) 236 (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 237 238 dbuf_release_bp(db); 239 bp = (blkptr_t *)db->db.db_data; 240 241 DB_DNODE_ENTER(db); 242 dn = DB_DNODE(db); 243 epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 244 shift = (db->db_level - 1) * epbs; 245 dbstart = db->db_blkid << epbs; 246 start = blkid >> shift; 247 if (dbstart < start) { 248 bp += start - dbstart; 249 all = FALSE; 250 } else { 251 start = dbstart; 252 } 253 dbend = ((db->db_blkid + 1) << epbs) - 1; 254 end = (blkid + nblks - 1) >> shift; 255 if (dbend <= end) 256 end = dbend; 257 else if (all) 258 all = trunc; 259 ASSERT3U(start, <=, end); 260 261 if (db->db_level == 1) { 262 FREE_VERIFY(db, start, end, tx); 263 blocks_freed = free_blocks(dn, bp, end-start+1, tx); 264 arc_buf_freeze(db->db_buf); 265 ASSERT(all || blocks_freed == 0 || db->db_last_dirty); 266 DB_DNODE_EXIT(db); 267 return (all ? ALL : blocks_freed); 268 } 269 270 for (i = start; i <= end; i++, bp++) { 271 if (BP_IS_HOLE(bp)) 272 continue; 273 rw_enter(&dn->dn_struct_rwlock, RW_READER); 274 err = dbuf_hold_impl(dn, db->db_level-1, i, TRUE, FTAG, &subdb); 275 ASSERT3U(err, ==, 0); 276 rw_exit(&dn->dn_struct_rwlock); 277 278 if (free_children(subdb, blkid, nblks, trunc, tx) == ALL) { 279 ASSERT3P(subdb->db_blkptr, ==, bp); 280 blocks_freed += free_blocks(dn, bp, 1, tx); 281 } else { 282 all = FALSE; 283 } 284 dbuf_rele(subdb, FTAG); 285 } 286 DB_DNODE_EXIT(db); 287 arc_buf_freeze(db->db_buf); 288#ifdef ZFS_DEBUG 289 bp -= (end-start)+1; 290 for (i = start; i <= end; i++, bp++) { 291 if (i == start && blkid != 0) 292 continue; 293 else if (i == end && !trunc) 294 continue; 295 ASSERT3U(bp->blk_birth, ==, 0); 296 } 297#endif 298 ASSERT(all || blocks_freed == 0 || db->db_last_dirty); 299 return (all ? ALL : blocks_freed); 300} 301 302/* 303 * free_range: Traverse the indicated range of the provided file 304 * and "free" all the blocks contained there. 305 */ 306static void 307dnode_sync_free_range(dnode_t *dn, uint64_t blkid, uint64_t nblks, dmu_tx_t *tx) 308{ 309 blkptr_t *bp = dn->dn_phys->dn_blkptr; 310 dmu_buf_impl_t *db; 311 int trunc, start, end, shift, i, err; 312 int dnlevel = dn->dn_phys->dn_nlevels; 313 314 if (blkid > dn->dn_phys->dn_maxblkid) 315 return; 316 317 ASSERT(dn->dn_phys->dn_maxblkid < UINT64_MAX); 318 trunc = blkid + nblks > dn->dn_phys->dn_maxblkid; 319 if (trunc) 320 nblks = dn->dn_phys->dn_maxblkid - blkid + 1; 321 322 /* There are no indirect blocks in the object */ 323 if (dnlevel == 1) { 324 if (blkid >= dn->dn_phys->dn_nblkptr) { 325 /* this range was never made persistent */ 326 return; 327 } 328 ASSERT3U(blkid + nblks, <=, dn->dn_phys->dn_nblkptr); 329 (void) free_blocks(dn, bp + blkid, nblks, tx); 330 if (trunc) { 331 uint64_t off = (dn->dn_phys->dn_maxblkid + 1) * 332 (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT); 333 dn->dn_phys->dn_maxblkid = (blkid ? blkid - 1 : 0); 334 ASSERT(off < dn->dn_phys->dn_maxblkid || 335 dn->dn_phys->dn_maxblkid == 0 || 336 dnode_next_offset(dn, 0, &off, 1, 1, 0) != 0); 337 } 338 return; 339 } 340 341 shift = (dnlevel - 1) * (dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT); 342 start = blkid >> shift; 343 ASSERT(start < dn->dn_phys->dn_nblkptr); 344 end = (blkid + nblks - 1) >> shift; 345 bp += start; 346 for (i = start; i <= end; i++, bp++) { 347 if (BP_IS_HOLE(bp)) 348 continue; 349 rw_enter(&dn->dn_struct_rwlock, RW_READER); 350 err = dbuf_hold_impl(dn, dnlevel-1, i, TRUE, FTAG, &db); 351 ASSERT3U(err, ==, 0); 352 rw_exit(&dn->dn_struct_rwlock); 353 354 if (free_children(db, blkid, nblks, trunc, tx) == ALL) { 355 ASSERT3P(db->db_blkptr, ==, bp); 356 (void) free_blocks(dn, bp, 1, tx); 357 } 358 dbuf_rele(db, FTAG); 359 } 360 if (trunc) { 361 uint64_t off = (dn->dn_phys->dn_maxblkid + 1) * 362 (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT); 363 dn->dn_phys->dn_maxblkid = (blkid ? blkid - 1 : 0); 364 ASSERT(off < dn->dn_phys->dn_maxblkid || 365 dn->dn_phys->dn_maxblkid == 0 || 366 dnode_next_offset(dn, 0, &off, 1, 1, 0) != 0); 367 } 368} 369 370/* 371 * Try to kick all the dnodes dbufs out of the cache... 372 */ 373void 374dnode_evict_dbufs(dnode_t *dn) 375{ 376 int progress; 377 int pass = 0; 378 379 do { 380 dmu_buf_impl_t *db, marker; 381 int evicting = FALSE; 382 383 progress = FALSE; 384 mutex_enter(&dn->dn_dbufs_mtx); 385 list_insert_tail(&dn->dn_dbufs, &marker); 386 db = list_head(&dn->dn_dbufs); 387 for (; db != ▮ db = list_head(&dn->dn_dbufs)) { 388 list_remove(&dn->dn_dbufs, db); 389 list_insert_tail(&dn->dn_dbufs, db); 390#ifdef DEBUG 391 DB_DNODE_ENTER(db); 392 ASSERT3P(DB_DNODE(db), ==, dn); 393 DB_DNODE_EXIT(db); 394#endif /* DEBUG */ 395 396 mutex_enter(&db->db_mtx); 397 if (db->db_state == DB_EVICTING) { 398 progress = TRUE; 399 evicting = TRUE; 400 mutex_exit(&db->db_mtx); 401 } else if (refcount_is_zero(&db->db_holds)) { 402 progress = TRUE; 403 dbuf_clear(db); /* exits db_mtx for us */ 404 } else { 405 mutex_exit(&db->db_mtx); 406 } 407 408 } 409 list_remove(&dn->dn_dbufs, &marker); 410 /* 411 * NB: we need to drop dn_dbufs_mtx between passes so 412 * that any DB_EVICTING dbufs can make progress. 413 * Ideally, we would have some cv we could wait on, but 414 * since we don't, just wait a bit to give the other 415 * thread a chance to run. 416 */ 417 mutex_exit(&dn->dn_dbufs_mtx); 418 if (evicting) 419 delay(1); 420 pass++; 421 ASSERT(pass < 100); /* sanity check */ 422 } while (progress); 423 424 rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 425 if (dn->dn_bonus && refcount_is_zero(&dn->dn_bonus->db_holds)) { 426 mutex_enter(&dn->dn_bonus->db_mtx); 427 dbuf_evict(dn->dn_bonus); 428 dn->dn_bonus = NULL; 429 } 430 rw_exit(&dn->dn_struct_rwlock); 431} 432 433static void 434dnode_undirty_dbufs(list_t *list) 435{ 436 dbuf_dirty_record_t *dr; 437 438 while (dr = list_head(list)) { 439 dmu_buf_impl_t *db = dr->dr_dbuf; 440 uint64_t txg = dr->dr_txg; 441 442 if (db->db_level != 0) 443 dnode_undirty_dbufs(&dr->dt.di.dr_children); 444 445 mutex_enter(&db->db_mtx); 446 /* XXX - use dbuf_undirty()? */ 447 list_remove(list, dr); 448 ASSERT(db->db_last_dirty == dr); 449 db->db_last_dirty = NULL; 450 db->db_dirtycnt -= 1; 451 if (db->db_level == 0) { 452 ASSERT(db->db_blkid == DMU_BONUS_BLKID || 453 dr->dt.dl.dr_data == db->db_buf); 454 dbuf_unoverride(dr); 455 } 456 kmem_free(dr, sizeof (dbuf_dirty_record_t)); 457 dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 458 } 459} 460 461static void 462dnode_sync_free(dnode_t *dn, dmu_tx_t *tx) 463{ 464 int txgoff = tx->tx_txg & TXG_MASK; 465 466 ASSERT(dmu_tx_is_syncing(tx)); 467 468 /* 469 * Our contents should have been freed in dnode_sync() by the 470 * free range record inserted by the caller of dnode_free(). 471 */ 472 ASSERT3U(DN_USED_BYTES(dn->dn_phys), ==, 0); 473 ASSERT(BP_IS_HOLE(dn->dn_phys->dn_blkptr)); 474 475 dnode_undirty_dbufs(&dn->dn_dirty_records[txgoff]); 476 dnode_evict_dbufs(dn); 477 ASSERT3P(list_head(&dn->dn_dbufs), ==, NULL); 478 479 /* 480 * XXX - It would be nice to assert this, but we may still 481 * have residual holds from async evictions from the arc... 482 * 483 * zfs_obj_to_path() also depends on this being 484 * commented out. 485 * 486 * ASSERT3U(refcount_count(&dn->dn_holds), ==, 1); 487 */ 488 489 /* Undirty next bits */ 490 dn->dn_next_nlevels[txgoff] = 0; 491 dn->dn_next_indblkshift[txgoff] = 0; 492 dn->dn_next_blksz[txgoff] = 0; 493 494 /* ASSERT(blkptrs are zero); */ 495 ASSERT(dn->dn_phys->dn_type != DMU_OT_NONE); 496 ASSERT(dn->dn_type != DMU_OT_NONE); 497 498 ASSERT(dn->dn_free_txg > 0); 499 if (dn->dn_allocated_txg != dn->dn_free_txg) 500 dbuf_will_dirty(dn->dn_dbuf, tx); 501 bzero(dn->dn_phys, sizeof (dnode_phys_t)); 502 503 mutex_enter(&dn->dn_mtx); 504 dn->dn_type = DMU_OT_NONE; 505 dn->dn_maxblkid = 0; 506 dn->dn_allocated_txg = 0; 507 dn->dn_free_txg = 0; 508 dn->dn_have_spill = B_FALSE; 509 mutex_exit(&dn->dn_mtx); 510 511 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 512 513 dnode_rele(dn, (void *)(uintptr_t)tx->tx_txg); 514 /* 515 * Now that we've released our hold, the dnode may 516 * be evicted, so we musn't access it. 517 */ 518} 519 520/* 521 * Write out the dnode's dirty buffers. 522 */ 523void 524dnode_sync(dnode_t *dn, dmu_tx_t *tx) 525{ 526 free_range_t *rp; 527 dnode_phys_t *dnp = dn->dn_phys; 528 int txgoff = tx->tx_txg & TXG_MASK; 529 list_t *list = &dn->dn_dirty_records[txgoff]; 530 static const dnode_phys_t zerodn = { 0 }; 531 boolean_t kill_spill = B_FALSE; 532 533 ASSERT(dmu_tx_is_syncing(tx)); 534 ASSERT(dnp->dn_type != DMU_OT_NONE || dn->dn_allocated_txg); 535 ASSERT(dnp->dn_type != DMU_OT_NONE || 536 bcmp(dnp, &zerodn, DNODE_SIZE) == 0); 537 DNODE_VERIFY(dn); 538 539 ASSERT(dn->dn_dbuf == NULL || arc_released(dn->dn_dbuf->db_buf)); 540 541 if (dmu_objset_userused_enabled(dn->dn_objset) && 542 !DMU_OBJECT_IS_SPECIAL(dn->dn_object)) { 543 mutex_enter(&dn->dn_mtx); 544 dn->dn_oldused = DN_USED_BYTES(dn->dn_phys); 545 dn->dn_oldflags = dn->dn_phys->dn_flags; 546 dn->dn_phys->dn_flags |= DNODE_FLAG_USERUSED_ACCOUNTED; 547 mutex_exit(&dn->dn_mtx); 548 dmu_objset_userquota_get_ids(dn, B_FALSE, tx); 549 } else { 550 /* Once we account for it, we should always account for it. */ 551 ASSERT(!(dn->dn_phys->dn_flags & 552 DNODE_FLAG_USERUSED_ACCOUNTED)); 553 } 554 555 mutex_enter(&dn->dn_mtx); 556 if (dn->dn_allocated_txg == tx->tx_txg) { 557 /* The dnode is newly allocated or reallocated */ 558 if (dnp->dn_type == DMU_OT_NONE) { 559 /* this is a first alloc, not a realloc */ 560 dnp->dn_nlevels = 1; 561 dnp->dn_nblkptr = dn->dn_nblkptr; 562 } 563 564 dnp->dn_type = dn->dn_type; 565 dnp->dn_bonustype = dn->dn_bonustype; 566 dnp->dn_bonuslen = dn->dn_bonuslen; 567 } 568 569 ASSERT(dnp->dn_nlevels > 1 || 570 BP_IS_HOLE(&dnp->dn_blkptr[0]) || 571 BP_GET_LSIZE(&dnp->dn_blkptr[0]) == 572 dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT); 573 574 if (dn->dn_next_blksz[txgoff]) { 575 ASSERT(P2PHASE(dn->dn_next_blksz[txgoff], 576 SPA_MINBLOCKSIZE) == 0); 577 ASSERT(BP_IS_HOLE(&dnp->dn_blkptr[0]) || 578 dn->dn_maxblkid == 0 || list_head(list) != NULL || 579 avl_last(&dn->dn_ranges[txgoff]) || 580 dn->dn_next_blksz[txgoff] >> SPA_MINBLOCKSHIFT == 581 dnp->dn_datablkszsec); 582 dnp->dn_datablkszsec = 583 dn->dn_next_blksz[txgoff] >> SPA_MINBLOCKSHIFT; 584 dn->dn_next_blksz[txgoff] = 0; 585 } 586 587 if (dn->dn_next_bonuslen[txgoff]) { 588 if (dn->dn_next_bonuslen[txgoff] == DN_ZERO_BONUSLEN) 589 dnp->dn_bonuslen = 0; 590 else 591 dnp->dn_bonuslen = dn->dn_next_bonuslen[txgoff]; 592 ASSERT(dnp->dn_bonuslen <= DN_MAX_BONUSLEN); 593 dn->dn_next_bonuslen[txgoff] = 0; 594 } 595 596 if (dn->dn_next_bonustype[txgoff]) { 597 ASSERT(dn->dn_next_bonustype[txgoff] < DMU_OT_NUMTYPES); 598 dnp->dn_bonustype = dn->dn_next_bonustype[txgoff]; 599 dn->dn_next_bonustype[txgoff] = 0; 600 } 601 602 /* 603 * We will either remove a spill block when a file is being removed 604 * or we have been asked to remove it. 605 */ 606 if (dn->dn_rm_spillblk[txgoff] || 607 ((dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) && 608 dn->dn_free_txg > 0 && dn->dn_free_txg <= tx->tx_txg)) { 609 if ((dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 610 kill_spill = B_TRUE; 611 dn->dn_rm_spillblk[txgoff] = 0; 612 } 613 614 if (dn->dn_next_indblkshift[txgoff]) { 615 ASSERT(dnp->dn_nlevels == 1); 616 dnp->dn_indblkshift = dn->dn_next_indblkshift[txgoff]; 617 dn->dn_next_indblkshift[txgoff] = 0; 618 } 619 620 /* 621 * Just take the live (open-context) values for checksum and compress. 622 * Strictly speaking it's a future leak, but nothing bad happens if we 623 * start using the new checksum or compress algorithm a little early. 624 */ 625 dnp->dn_checksum = dn->dn_checksum; 626 dnp->dn_compress = dn->dn_compress; 627 628 mutex_exit(&dn->dn_mtx); 629 630 if (kill_spill) { 631 (void) free_blocks(dn, &dn->dn_phys->dn_spill, 1, tx); 632 mutex_enter(&dn->dn_mtx); 633 dnp->dn_flags &= ~DNODE_FLAG_SPILL_BLKPTR; 634 mutex_exit(&dn->dn_mtx); 635 } 636 637 /* process all the "freed" ranges in the file */ 638 while (rp = avl_last(&dn->dn_ranges[txgoff])) { 639 dnode_sync_free_range(dn, rp->fr_blkid, rp->fr_nblks, tx); 640 /* grab the mutex so we don't race with dnode_block_freed() */ 641 mutex_enter(&dn->dn_mtx); 642 avl_remove(&dn->dn_ranges[txgoff], rp); 643 mutex_exit(&dn->dn_mtx); 644 kmem_free(rp, sizeof (free_range_t)); 645 } 646 647 if (dn->dn_free_txg > 0 && dn->dn_free_txg <= tx->tx_txg) { 648 dnode_sync_free(dn, tx); 649 return; 650 } 651 652 if (dn->dn_next_nblkptr[txgoff]) { 653 /* this should only happen on a realloc */ 654 ASSERT(dn->dn_allocated_txg == tx->tx_txg); 655 if (dn->dn_next_nblkptr[txgoff] > dnp->dn_nblkptr) { 656 /* zero the new blkptrs we are gaining */ 657 bzero(dnp->dn_blkptr + dnp->dn_nblkptr, 658 sizeof (blkptr_t) * 659 (dn->dn_next_nblkptr[txgoff] - dnp->dn_nblkptr)); 660#ifdef ZFS_DEBUG 661 } else { 662 int i; 663 ASSERT(dn->dn_next_nblkptr[txgoff] < dnp->dn_nblkptr); 664 /* the blkptrs we are losing better be unallocated */ 665 for (i = dn->dn_next_nblkptr[txgoff]; 666 i < dnp->dn_nblkptr; i++) 667 ASSERT(BP_IS_HOLE(&dnp->dn_blkptr[i])); 668#endif 669 } 670 mutex_enter(&dn->dn_mtx); 671 dnp->dn_nblkptr = dn->dn_next_nblkptr[txgoff]; 672 dn->dn_next_nblkptr[txgoff] = 0; 673 mutex_exit(&dn->dn_mtx); 674 } 675 676 if (dn->dn_next_nlevels[txgoff]) { 677 dnode_increase_indirection(dn, tx); 678 dn->dn_next_nlevels[txgoff] = 0; 679 } 680 681 dbuf_sync_list(list, tx); 682 683 if (!DMU_OBJECT_IS_SPECIAL(dn->dn_object)) { 684 ASSERT3P(list_head(list), ==, NULL); 685 dnode_rele(dn, (void *)(uintptr_t)tx->tx_txg); 686 } 687 688 /* 689 * Although we have dropped our reference to the dnode, it 690 * can't be evicted until its written, and we haven't yet 691 * initiated the IO for the dnode's dbuf. 692 */ 693} 694