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 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/zfs_context.h> 29 #include <sys/dbuf.h> 30 #include <sys/dnode.h> 31 #include <sys/dmu.h> 32 #include <sys/dmu_tx.h> 33 #include <sys/dmu_objset.h> 34 #include <sys/dsl_dataset.h> 35 #include <sys/spa.h> 36 #include <sys/zio.h> 37 38 static void 39 dnode_increase_indirection(dnode_t *dn, dmu_tx_t *tx) 40 { 41 dmu_buf_impl_t *db; 42 int i; 43 uint64_t txg = tx->tx_txg; 44 45 ASSERT(dn->dn_phys->dn_type != DMU_OT_NONE); 46 ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 47 /* this dnode can't be paged out because it's dirty */ 48 49 db = dbuf_hold_level(dn, dn->dn_phys->dn_nlevels, 0, FTAG); 50 ASSERT(db != NULL); 51 for (i = 0; i < dn->dn_phys->dn_nblkptr; i++) 52 if (!BP_IS_HOLE(&dn->dn_phys->dn_blkptr[i])) 53 break; 54 if (i != dn->dn_phys->dn_nblkptr) { 55 ASSERT(list_link_active(&db->db_dirty_node[txg&TXG_MASK])); 56 57 (void) dbuf_read(db, NULL, 58 DB_RF_HAVESTRUCT | DB_RF_MUST_SUCCEED); 59 arc_release(db->db_buf, db); 60 /* copy dnode's block pointers to new indirect block */ 61 ASSERT3U(sizeof (blkptr_t) * dn->dn_phys->dn_nblkptr, <=, 62 db->db.db_size); 63 bcopy(dn->dn_phys->dn_blkptr, db->db.db_data, 64 sizeof (blkptr_t) * dn->dn_phys->dn_nblkptr); 65 } 66 67 dn->dn_phys->dn_nlevels += 1; 68 dprintf("os=%p obj=%llu, increase to %d\n", 69 dn->dn_objset, dn->dn_object, 70 dn->dn_phys->dn_nlevels); 71 72 /* set dbuf's parent pointers to new indirect buf */ 73 for (i = 0; i < dn->dn_phys->dn_nblkptr; i++) { 74 dmu_buf_impl_t *child = 75 dbuf_find(dn, dn->dn_phys->dn_nlevels-2, i); 76 if (child == NULL) 77 continue; 78 if (child->db_dnode == NULL) { 79 mutex_exit(&child->db_mtx); 80 continue; 81 } 82 83 if (child->db_parent == NULL || 84 child->db_parent == dn->dn_dbuf) { 85 dprintf_dbuf_bp(child, child->db_blkptr, 86 "changing db_blkptr to new indirect %s", ""); 87 child->db_parent = db; 88 dbuf_add_ref(db, child); 89 if (db->db.db_data) { 90 child->db_blkptr = 91 (blkptr_t *)db->db.db_data + i; 92 } else { 93 child->db_blkptr = NULL; 94 } 95 dprintf_dbuf_bp(child, child->db_blkptr, 96 "changed db_blkptr to new indirect %s", ""); 97 } 98 ASSERT3P(child->db_parent, ==, db); 99 100 mutex_exit(&child->db_mtx); 101 } 102 103 bzero(dn->dn_phys->dn_blkptr, 104 sizeof (blkptr_t) * dn->dn_phys->dn_nblkptr); 105 106 dbuf_rele(db, FTAG); 107 } 108 109 static void 110 free_blocks(dnode_t *dn, blkptr_t *bp, int num, dmu_tx_t *tx) 111 { 112 objset_impl_t *os = dn->dn_objset; 113 uint64_t bytesfreed = 0; 114 int i; 115 116 dprintf("os=%p obj=%llx num=%d\n", os, dn->dn_object, num); 117 118 for (i = 0; i < num; i++, bp++) { 119 if (BP_IS_HOLE(bp)) 120 continue; 121 122 bytesfreed += bp_get_dasize(os->os_spa, bp); 123 ASSERT3U(bytesfreed, <=, DN_USED_BYTES(dn->dn_phys)); 124 dsl_dataset_block_kill(os->os_dsl_dataset, bp, tx); 125 } 126 dnode_diduse_space(dn, -bytesfreed); 127 } 128 129 #ifdef ZFS_DEBUG 130 static void 131 free_verify(dmu_buf_impl_t *db, uint64_t start, uint64_t end, dmu_tx_t *tx) 132 { 133 int off, num; 134 int i, err, epbs; 135 uint64_t txg = tx->tx_txg; 136 137 epbs = db->db_dnode->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 138 off = start - (db->db_blkid * 1<<epbs); 139 num = end - start + 1; 140 141 ASSERT3U(off, >=, 0); 142 ASSERT3U(num, >=, 0); 143 ASSERT3U(db->db_level, >, 0); 144 ASSERT3U(db->db.db_size, ==, 1<<db->db_dnode->dn_phys->dn_indblkshift); 145 ASSERT3U(off+num, <=, db->db.db_size >> SPA_BLKPTRSHIFT); 146 ASSERT(db->db_blkptr != NULL); 147 148 for (i = off; i < off+num; i++) { 149 uint64_t *buf; 150 int j; 151 dmu_buf_impl_t *child; 152 153 ASSERT(db->db_level == 1); 154 155 rw_enter(&db->db_dnode->dn_struct_rwlock, RW_READER); 156 err = dbuf_hold_impl(db->db_dnode, db->db_level-1, 157 (db->db_blkid << epbs) + i, TRUE, FTAG, &child); 158 rw_exit(&db->db_dnode->dn_struct_rwlock); 159 if (err == ENOENT) 160 continue; 161 ASSERT(err == 0); 162 ASSERT(child->db_level == 0); 163 ASSERT(!list_link_active(&child->db_dirty_node[txg&TXG_MASK])); 164 165 /* db_data_old better be zeroed */ 166 if (child->db_d.db_data_old[txg & TXG_MASK]) { 167 buf = ((arc_buf_t *)child->db_d.db_data_old 168 [txg & TXG_MASK])->b_data; 169 for (j = 0; j < child->db.db_size >> 3; j++) { 170 if (buf[j] != 0) { 171 panic("freed data not zero: " 172 "child=%p i=%d off=%d num=%d\n", 173 child, i, off, num); 174 } 175 } 176 } 177 178 /* 179 * db_data better be zeroed unless it's dirty in a 180 * future txg. 181 */ 182 mutex_enter(&child->db_mtx); 183 buf = child->db.db_data; 184 if (buf != NULL && child->db_state != DB_FILL && 185 !list_link_active(&child->db_dirty_node 186 [(txg+1) & TXG_MASK]) && 187 !list_link_active(&child->db_dirty_node 188 [(txg+2) & TXG_MASK])) { 189 for (j = 0; j < child->db.db_size >> 3; j++) { 190 if (buf[j] != 0) { 191 panic("freed data not zero: " 192 "child=%p i=%d off=%d num=%d\n", 193 child, i, off, num); 194 } 195 } 196 } 197 mutex_exit(&child->db_mtx); 198 199 dbuf_rele(child, FTAG); 200 } 201 } 202 #endif 203 204 static int 205 free_children(dmu_buf_impl_t *db, uint64_t blkid, uint64_t nblks, int trunc, 206 dmu_tx_t *tx) 207 { 208 dnode_t *dn = db->db_dnode; 209 blkptr_t *bp; 210 dmu_buf_impl_t *subdb; 211 uint64_t start, end, dbstart, dbend, i; 212 int epbs, shift, err; 213 int txgoff = tx->tx_txg & TXG_MASK; 214 int all = TRUE; 215 216 (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 217 arc_release(db->db_buf, db); 218 bp = (blkptr_t *)db->db.db_data; 219 220 epbs = db->db_dnode->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 221 shift = (db->db_level - 1) * epbs; 222 dbstart = db->db_blkid << epbs; 223 start = blkid >> shift; 224 if (dbstart < start) { 225 bp += start - dbstart; 226 all = FALSE; 227 } else { 228 start = dbstart; 229 } 230 dbend = ((db->db_blkid + 1) << epbs) - 1; 231 end = (blkid + nblks - 1) >> shift; 232 if (dbend <= end) 233 end = dbend; 234 else if (all) 235 all = trunc; 236 ASSERT3U(start, <=, end); 237 238 if (db->db_level == 1) { 239 FREE_VERIFY(db, start, end, tx); 240 free_blocks(dn, bp, end-start+1, tx); 241 ASSERT(all || list_link_active(&db->db_dirty_node[txgoff])); 242 return (all); 243 } 244 245 for (i = start; i <= end; i++, bp++) { 246 if (BP_IS_HOLE(bp)) 247 continue; 248 rw_enter(&dn->dn_struct_rwlock, RW_READER); 249 err = dbuf_hold_impl(dn, db->db_level-1, i, TRUE, FTAG, &subdb); 250 ASSERT3U(err, ==, 0); 251 rw_exit(&dn->dn_struct_rwlock); 252 253 if (free_children(subdb, blkid, nblks, trunc, tx)) { 254 ASSERT3P(subdb->db_blkptr, ==, bp); 255 free_blocks(dn, bp, 1, tx); 256 } else { 257 all = FALSE; 258 } 259 dbuf_rele(subdb, FTAG); 260 } 261 #ifdef ZFS_DEBUG 262 bp -= (end-start)+1; 263 for (i = start; i <= end; i++, bp++) { 264 if (i == start && blkid != 0) 265 continue; 266 else if (i == end && !trunc) 267 continue; 268 ASSERT3U(bp->blk_birth, ==, 0); 269 } 270 #endif 271 ASSERT(all || list_link_active(&db->db_dirty_node[txgoff])); 272 return (all); 273 } 274 275 /* 276 * free_range: Traverse the indicated range of the provided file 277 * and "free" all the blocks contained there. 278 */ 279 static void 280 dnode_sync_free_range(dnode_t *dn, uint64_t blkid, uint64_t nblks, dmu_tx_t *tx) 281 { 282 blkptr_t *bp = dn->dn_phys->dn_blkptr; 283 dmu_buf_impl_t *db; 284 int trunc, start, end, shift, i, err; 285 int dnlevel = dn->dn_phys->dn_nlevels; 286 287 if (blkid > dn->dn_phys->dn_maxblkid) 288 return; 289 290 ASSERT(dn->dn_phys->dn_maxblkid < UINT64_MAX); 291 trunc = blkid + nblks > dn->dn_phys->dn_maxblkid; 292 if (trunc) 293 nblks = dn->dn_phys->dn_maxblkid - blkid + 1; 294 295 /* There are no indirect blocks in the object */ 296 if (dnlevel == 1) { 297 if (blkid >= dn->dn_phys->dn_nblkptr) { 298 /* this range was never made persistent */ 299 return; 300 } 301 ASSERT3U(blkid + nblks, <=, dn->dn_phys->dn_nblkptr); 302 free_blocks(dn, bp + blkid, nblks, tx); 303 if (trunc) { 304 uint64_t off = (dn->dn_phys->dn_maxblkid + 1) * 305 (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT); 306 dn->dn_phys->dn_maxblkid = (blkid ? blkid - 1 : 0); 307 ASSERT(off < dn->dn_phys->dn_maxblkid || 308 dn->dn_phys->dn_maxblkid == 0 || 309 dnode_next_offset(dn, FALSE, &off, 1, 1) == ESRCH); 310 } 311 return; 312 } 313 314 shift = (dnlevel - 1) * (dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT); 315 start = blkid >> shift; 316 ASSERT(start < dn->dn_phys->dn_nblkptr); 317 end = (blkid + nblks - 1) >> shift; 318 bp += start; 319 for (i = start; i <= end; i++, bp++) { 320 if (BP_IS_HOLE(bp)) 321 continue; 322 rw_enter(&dn->dn_struct_rwlock, RW_READER); 323 err = dbuf_hold_impl(dn, dnlevel-1, i, TRUE, FTAG, &db); 324 ASSERT3U(err, ==, 0); 325 rw_exit(&dn->dn_struct_rwlock); 326 327 if (free_children(db, blkid, nblks, trunc, tx)) { 328 ASSERT3P(db->db_blkptr, ==, bp); 329 free_blocks(dn, bp, 1, tx); 330 } 331 dbuf_rele(db, FTAG); 332 } 333 if (trunc) { 334 uint64_t off = (dn->dn_phys->dn_maxblkid + 1) * 335 (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT); 336 dn->dn_phys->dn_maxblkid = (blkid ? blkid - 1 : 0); 337 ASSERT(off < dn->dn_phys->dn_maxblkid || 338 dn->dn_phys->dn_maxblkid == 0 || 339 dnode_next_offset(dn, FALSE, &off, 1, 1) == ESRCH); 340 } 341 } 342 343 /* 344 * Try to kick all the dnodes dbufs out of the cache... 345 */ 346 int 347 dnode_evict_dbufs(dnode_t *dn, int try) 348 { 349 int progress; 350 int pass = 0; 351 352 do { 353 dmu_buf_impl_t *db, marker; 354 int evicting = FALSE; 355 356 progress = FALSE; 357 mutex_enter(&dn->dn_dbufs_mtx); 358 list_insert_tail(&dn->dn_dbufs, &marker); 359 db = list_head(&dn->dn_dbufs); 360 for (; db != ▮ db = list_head(&dn->dn_dbufs)) { 361 list_remove(&dn->dn_dbufs, db); 362 list_insert_tail(&dn->dn_dbufs, db); 363 364 mutex_enter(&db->db_mtx); 365 if (db->db_state == DB_EVICTING) { 366 progress = TRUE; 367 evicting = TRUE; 368 mutex_exit(&db->db_mtx); 369 } else if (refcount_is_zero(&db->db_holds)) { 370 progress = TRUE; 371 ASSERT(!arc_released(db->db_buf)); 372 dbuf_clear(db); /* exits db_mtx for us */ 373 } else { 374 mutex_exit(&db->db_mtx); 375 } 376 377 } 378 list_remove(&dn->dn_dbufs, &marker); 379 /* 380 * NB: we need to drop dn_dbufs_mtx between passes so 381 * that any DB_EVICTING dbufs can make progress. 382 * Ideally, we would have some cv we could wait on, but 383 * since we don't, just wait a bit to give the other 384 * thread a chance to run. 385 */ 386 mutex_exit(&dn->dn_dbufs_mtx); 387 if (evicting) 388 delay(1); 389 pass++; 390 ASSERT(pass < 100); /* sanity check */ 391 } while (progress); 392 393 /* 394 * This function works fine even if it can't evict everything. 395 * If were only asked to try to evict everything then 396 * return an error if we can't. Otherwise panic as the caller 397 * expects total eviction. 398 */ 399 if (list_head(&dn->dn_dbufs) != NULL) { 400 if (try) { 401 return (1); 402 } else { 403 panic("dangling dbufs (dn=%p, dbuf=%p)\n", 404 dn, list_head(&dn->dn_dbufs)); 405 } 406 } 407 408 rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 409 if (dn->dn_bonus && refcount_is_zero(&dn->dn_bonus->db_holds)) { 410 mutex_enter(&dn->dn_bonus->db_mtx); 411 dbuf_evict(dn->dn_bonus); 412 dn->dn_bonus = NULL; 413 } 414 rw_exit(&dn->dn_struct_rwlock); 415 return (0); 416 } 417 418 static int 419 dnode_sync_free(dnode_t *dn, dmu_tx_t *tx) 420 { 421 dmu_buf_impl_t *db; 422 int txgoff = tx->tx_txg & TXG_MASK; 423 424 ASSERT(dmu_tx_is_syncing(tx)); 425 426 /* Undirty all buffers */ 427 while (db = list_head(&dn->dn_dirty_dbufs[txgoff])) { 428 mutex_enter(&db->db_mtx); 429 /* XXX - use dbuf_undirty()? */ 430 list_remove(&dn->dn_dirty_dbufs[txgoff], db); 431 if (db->db_level == 0) { 432 ASSERT(db->db_blkid == DB_BONUS_BLKID || 433 db->db_d.db_data_old[txgoff] == db->db_buf); 434 if (db->db_d.db_overridden_by[txgoff]) 435 dbuf_unoverride(db, tx->tx_txg); 436 db->db_d.db_data_old[txgoff] = NULL; 437 } 438 db->db_dirtycnt -= 1; 439 mutex_exit(&db->db_mtx); 440 dbuf_rele(db, (void *)(uintptr_t)tx->tx_txg); 441 } 442 443 (void) dnode_evict_dbufs(dn, 0); 444 ASSERT3P(list_head(&dn->dn_dbufs), ==, NULL); 445 446 /* 447 * XXX - It would be nice to assert this, but we may still 448 * have residual holds from async evictions from the arc... 449 * 450 * ASSERT3U(refcount_count(&dn->dn_holds), ==, 1); 451 */ 452 453 /* Undirty next bits */ 454 dn->dn_next_nlevels[txgoff] = 0; 455 dn->dn_next_indblkshift[txgoff] = 0; 456 dn->dn_next_blksz[txgoff] = 0; 457 458 /* free up all the blocks in the file. */ 459 dnode_sync_free_range(dn, 0, dn->dn_phys->dn_maxblkid+1, tx); 460 ASSERT3U(DN_USED_BYTES(dn->dn_phys), ==, 0); 461 462 /* ASSERT(blkptrs are zero); */ 463 ASSERT(dn->dn_phys->dn_type != DMU_OT_NONE); 464 ASSERT(dn->dn_type != DMU_OT_NONE); 465 466 ASSERT(dn->dn_free_txg > 0); 467 if (dn->dn_allocated_txg != dn->dn_free_txg) 468 dbuf_will_dirty(dn->dn_dbuf, tx); 469 bzero(dn->dn_phys, sizeof (dnode_phys_t)); 470 471 mutex_enter(&dn->dn_mtx); 472 dn->dn_type = DMU_OT_NONE; 473 dn->dn_maxblkid = 0; 474 dn->dn_allocated_txg = 0; 475 mutex_exit(&dn->dn_mtx); 476 477 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 478 479 dnode_rele(dn, (void *)(uintptr_t)tx->tx_txg); 480 /* 481 * Now that we've released our hold, the dnode may 482 * be evicted, so we musn't access it. 483 */ 484 return (1); 485 } 486 487 /* 488 * Write out the dnode's dirty buffers at the specified level. 489 * This may create more dirty buffers at the next level up. 490 * 491 * NOTE: The dnode is kept in memory by being dirty. Once the 492 * dirty bit is cleared, it may be evicted. Beware of this! 493 */ 494 int 495 dnode_sync(dnode_t *dn, int level, zio_t *zio, dmu_tx_t *tx) 496 { 497 free_range_t *rp; 498 int txgoff = tx->tx_txg & TXG_MASK; 499 dnode_phys_t *dnp = dn->dn_phys; 500 501 ASSERT(dmu_tx_is_syncing(tx)); 502 ASSERT(dnp->dn_type != DMU_OT_NONE || dn->dn_allocated_txg); 503 DNODE_VERIFY(dn); 504 505 /* 506 * Make sure the dbuf for the dn_phys is released before we modify it. 507 */ 508 if (dn->dn_dbuf) 509 arc_release(dn->dn_dbuf->db_buf, dn->dn_dbuf); 510 511 mutex_enter(&dn->dn_mtx); 512 if (dn->dn_allocated_txg == tx->tx_txg) { 513 /* The dnode is newly allocated or reallocated */ 514 if (dnp->dn_type == DMU_OT_NONE) { 515 /* this is a first alloc, not a realloc */ 516 /* XXX shouldn't the phys already be zeroed? */ 517 bzero(dnp, DNODE_CORE_SIZE); 518 dnp->dn_nlevels = 1; 519 } 520 521 if (dn->dn_nblkptr > dnp->dn_nblkptr) { 522 /* zero the new blkptrs we are gaining */ 523 bzero(dnp->dn_blkptr + dnp->dn_nblkptr, 524 sizeof (blkptr_t) * 525 (dn->dn_nblkptr - dnp->dn_nblkptr)); 526 } 527 dnp->dn_type = dn->dn_type; 528 dnp->dn_bonustype = dn->dn_bonustype; 529 dnp->dn_bonuslen = dn->dn_bonuslen; 530 dnp->dn_nblkptr = dn->dn_nblkptr; 531 } 532 533 ASSERT(level != 0 || dnp->dn_nlevels > 1 || 534 BP_IS_HOLE(&dnp->dn_blkptr[0]) || 535 BP_GET_LSIZE(&dnp->dn_blkptr[0]) == 536 dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT); 537 538 if (dn->dn_next_blksz[txgoff]) { 539 ASSERT(P2PHASE(dn->dn_next_blksz[txgoff], 540 SPA_MINBLOCKSIZE) == 0); 541 ASSERT(BP_IS_HOLE(&dnp->dn_blkptr[0]) || 542 list_head(&dn->dn_dirty_dbufs[txgoff]) != NULL || 543 dn->dn_next_blksz[txgoff] >> SPA_MINBLOCKSHIFT == 544 dnp->dn_datablkszsec); 545 dnp->dn_datablkszsec = 546 dn->dn_next_blksz[txgoff] >> SPA_MINBLOCKSHIFT; 547 dn->dn_next_blksz[txgoff] = 0; 548 } 549 550 if (dn->dn_next_indblkshift[txgoff]) { 551 ASSERT(dnp->dn_nlevels == 1); 552 dnp->dn_indblkshift = dn->dn_next_indblkshift[txgoff]; 553 dn->dn_next_indblkshift[txgoff] = 0; 554 } 555 556 /* 557 * Just take the live (open-context) values for checksum and compress. 558 * Strictly speaking it's a future leak, but nothing bad happens if we 559 * start using the new checksum or compress algorithm a little early. 560 */ 561 dnp->dn_checksum = dn->dn_checksum; 562 dnp->dn_compress = dn->dn_compress; 563 564 mutex_exit(&dn->dn_mtx); 565 566 /* process all the "freed" ranges in the file */ 567 if (dn->dn_free_txg == 0 || dn->dn_free_txg > tx->tx_txg) { 568 for (rp = avl_last(&dn->dn_ranges[txgoff]); rp != NULL; 569 rp = AVL_PREV(&dn->dn_ranges[txgoff], rp)) 570 dnode_sync_free_range(dn, 571 rp->fr_blkid, rp->fr_nblks, tx); 572 } 573 mutex_enter(&dn->dn_mtx); 574 for (rp = avl_first(&dn->dn_ranges[txgoff]); rp; ) { 575 free_range_t *last = rp; 576 rp = AVL_NEXT(&dn->dn_ranges[txgoff], rp); 577 avl_remove(&dn->dn_ranges[txgoff], last); 578 kmem_free(last, sizeof (free_range_t)); 579 } 580 mutex_exit(&dn->dn_mtx); 581 582 if (dn->dn_free_txg > 0 && dn->dn_free_txg <= tx->tx_txg) { 583 ASSERT3U(level, ==, 0); 584 return (dnode_sync_free(dn, tx)); 585 } 586 587 if (dn->dn_next_nlevels[txgoff]) { 588 int new_lvl = dn->dn_next_nlevels[txgoff]; 589 590 rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 591 while (new_lvl > dnp->dn_nlevels) 592 dnode_increase_indirection(dn, tx); 593 rw_exit(&dn->dn_struct_rwlock); 594 dn->dn_next_nlevels[txgoff] = 0; 595 } 596 597 if (level == dnp->dn_nlevels) { 598 uint64_t off = (dn->dn_phys->dn_maxblkid + 1) * 599 (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT); 600 601 /* we've already synced out all data and indirect blocks */ 602 /* there are no more dirty dbufs under this dnode */ 603 ASSERT3P(list_head(&dn->dn_dirty_dbufs[txgoff]), ==, NULL); 604 ASSERT(dn->dn_free_txg == 0 || dn->dn_free_txg >= tx->tx_txg); 605 606 /* XXX this is expensive. remove once 6343073 is closed. */ 607 /* NB: the "off < maxblkid" is to catch overflow */ 608 /* 609 * NB: if blocksize is changing, we could get confused, 610 * so only bother if there are multiple blocks and thus 611 * it can't be changing. 612 */ 613 if (!(off < dn->dn_phys->dn_maxblkid || 614 dn->dn_phys->dn_maxblkid == 0 || 615 dnode_next_offset(dn, FALSE, &off, 1, 1) == ESRCH)) 616 panic("data after EOF: off=%llu\n", (u_longlong_t)off); 617 618 ASSERT(dnp->dn_nlevels > 1 || 619 BP_IS_HOLE(&dnp->dn_blkptr[0]) || 620 BP_GET_LSIZE(&dnp->dn_blkptr[0]) == 621 dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT); 622 623 if (dn->dn_object != DMU_META_DNODE_OBJECT) { 624 dbuf_will_dirty(dn->dn_dbuf, tx); 625 dnode_rele(dn, (void *)(uintptr_t)tx->tx_txg); 626 } 627 628 /* 629 * Now that we've dropped the reference, the dnode may 630 * be evicted, so we musn't access it. 631 */ 632 return (1); 633 } else { 634 dmu_buf_impl_t *db, *db_next; 635 list_t *list = &dn->dn_dirty_dbufs[txgoff]; 636 /* 637 * Iterate over the list, removing and sync'ing dbufs 638 * which are on the level we want, and leaving others. 639 */ 640 for (db = list_head(list); db; db = db_next) { 641 db_next = list_next(list, db); 642 if (db->db_level == level) { 643 list_remove(list, db); 644 dbuf_sync(db, zio, tx); 645 } 646 } 647 return (0); 648 } 649 } 650