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 /*
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2012 by Delphix. All rights reserved.
25 */
26
27 #include <sys/zfs_context.h>
28 #include <sys/dbuf.h>
29 #include <sys/dnode.h>
30 #include <sys/dmu.h>
31 #include <sys/dmu_tx.h>
32 #include <sys/dmu_objset.h>
33 #include <sys/dsl_dataset.h>
34 #include <sys/spa.h>
35
36 static void
37 dnode_increase_indirection(dnode_t *dn, dmu_tx_t *tx)
38 {
39 dmu_buf_impl_t *db;
40 int txgoff = tx->tx_txg & TXG_MASK;
41 int nblkptr = dn->dn_phys->dn_nblkptr;
42 int old_toplvl = dn->dn_phys->dn_nlevels - 1;
43 int new_level = dn->dn_next_nlevels[txgoff];
44 int i;
45
46 rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
47
48 /* this dnode can't be paged out because it's dirty */
49 ASSERT(dn->dn_phys->dn_type != DMU_OT_NONE);
50 ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock));
51 ASSERT(new_level > 1 && dn->dn_phys->dn_nlevels > 0);
52
53 db = dbuf_hold_level(dn, dn->dn_phys->dn_nlevels, 0, FTAG);
54 ASSERT(db != NULL);
55
56 dn->dn_phys->dn_nlevels = new_level;
57 dprintf("os=%p obj=%llu, increase to %d\n", dn->dn_objset,
58 dn->dn_object, dn->dn_phys->dn_nlevels);
59
60 /* check for existing blkptrs in the dnode */
61 for (i = 0; i < nblkptr; i++)
62 if (!BP_IS_HOLE(&dn->dn_phys->dn_blkptr[i]))
63 break;
64 if (i != nblkptr) {
65 /* transfer dnode's block pointers to new indirect block */
66 (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED|DB_RF_HAVESTRUCT);
67 ASSERT(db->db.db_data);
68 ASSERT(arc_released(db->db_buf));
69 ASSERT3U(sizeof (blkptr_t) * nblkptr, <=, db->db.db_size);
70 bcopy(dn->dn_phys->dn_blkptr, db->db.db_data,
71 sizeof (blkptr_t) * nblkptr);
72 arc_buf_freeze(db->db_buf);
73 }
74
75 /* set dbuf's parent pointers to new indirect buf */
76 for (i = 0; i < nblkptr; i++) {
77 dmu_buf_impl_t *child = dbuf_find(dn, old_toplvl, i);
78
79 if (child == NULL)
80 continue;
81 #ifdef DEBUG
82 DB_DNODE_ENTER(child);
83 ASSERT3P(DB_DNODE(child), ==, dn);
84 DB_DNODE_EXIT(child);
85 #endif /* DEBUG */
86 if (child->db_parent && child->db_parent != dn->dn_dbuf) {
87 ASSERT(child->db_parent->db_level == db->db_level);
88 ASSERT(child->db_blkptr !=
89 &dn->dn_phys->dn_blkptr[child->db_blkid]);
90 mutex_exit(&child->db_mtx);
91 continue;
92 }
93 ASSERT(child->db_parent == NULL ||
94 child->db_parent == dn->dn_dbuf);
95
96 child->db_parent = db;
97 dbuf_add_ref(db, child);
98 if (db->db.db_data)
99 child->db_blkptr = (blkptr_t *)db->db.db_data + i;
100 else
101 child->db_blkptr = NULL;
102 dprintf_dbuf_bp(child, child->db_blkptr,
103 "changed db_blkptr to new indirect %s", "");
104
105 mutex_exit(&child->db_mtx);
106 }
107
108 bzero(dn->dn_phys->dn_blkptr, sizeof (blkptr_t) * nblkptr);
109
110 dbuf_rele(db, FTAG);
111
112 rw_exit(&dn->dn_struct_rwlock);
113 }
114
115 static int
116 free_blocks(dnode_t *dn, blkptr_t *bp, int num, dmu_tx_t *tx)
117 {
118 dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset;
119 uint64_t bytesfreed = 0;
120 int i, blocks_freed = 0;
121
122 dprintf("ds=%p obj=%llx num=%d\n", ds, dn->dn_object, num);
123
124 for (i = 0; i < num; i++, bp++) {
125 if (BP_IS_HOLE(bp))
126 continue;
127
128 bytesfreed += dsl_dataset_block_kill(ds, bp, tx, B_FALSE);
129 ASSERT3U(bytesfreed, <=, DN_USED_BYTES(dn->dn_phys));
130 bzero(bp, sizeof (blkptr_t));
131 blocks_freed += 1;
132 }
133 dnode_diduse_space(dn, -bytesfreed);
134 return (blocks_freed);
135 }
136
137 #ifdef ZFS_DEBUG
138 static void
139 free_verify(dmu_buf_impl_t *db, uint64_t start, uint64_t end, dmu_tx_t *tx)
140 {
141 int off, num;
142 int i, err, epbs;
143 uint64_t txg = tx->tx_txg;
144 dnode_t *dn;
145
146 DB_DNODE_ENTER(db);
147 dn = DB_DNODE(db);
148 epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
149 off = start - (db->db_blkid * 1<<epbs);
150 num = end - start + 1;
151
152 ASSERT3U(off, >=, 0);
153 ASSERT3U(num, >=, 0);
154 ASSERT3U(db->db_level, >, 0);
155 ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift);
156 ASSERT3U(off+num, <=, db->db.db_size >> SPA_BLKPTRSHIFT);
157 ASSERT(db->db_blkptr != NULL);
158
159 for (i = off; i < off+num; i++) {
160 uint64_t *buf;
161 dmu_buf_impl_t *child;
162 dbuf_dirty_record_t *dr;
163 int j;
164
165 ASSERT(db->db_level == 1);
166
167 rw_enter(&dn->dn_struct_rwlock, RW_READER);
168 err = dbuf_hold_impl(dn, db->db_level-1,
169 (db->db_blkid << epbs) + i, TRUE, FTAG, &child);
170 rw_exit(&dn->dn_struct_rwlock);
171 if (err == ENOENT)
172 continue;
173 ASSERT(err == 0);
174 ASSERT(child->db_level == 0);
175 dr = child->db_last_dirty;
176 while (dr && dr->dr_txg > txg)
177 dr = dr->dr_next;
178 ASSERT(dr == NULL || dr->dr_txg == txg);
179
180 /* data_old better be zeroed */
181 if (dr) {
182 buf = dr->dt.dl.dr_data->b_data;
183 for (j = 0; j < child->db.db_size >> 3; j++) {
184 if (buf[j] != 0) {
185 panic("freed data not zero: "
186 "child=%p i=%d off=%d num=%d\n",
187 (void *)child, i, off, num);
188 }
189 }
190 }
191
192 /*
193 * db_data better be zeroed unless it's dirty in a
194 * future txg.
195 */
196 mutex_enter(&child->db_mtx);
197 buf = child->db.db_data;
198 if (buf != NULL && child->db_state != DB_FILL &&
199 child->db_last_dirty == NULL) {
200 for (j = 0; j < child->db.db_size >> 3; j++) {
201 if (buf[j] != 0) {
202 panic("freed data not zero: "
203 "child=%p i=%d off=%d num=%d\n",
204 (void *)child, i, off, num);
205 }
206 }
207 }
208 mutex_exit(&child->db_mtx);
209
210 dbuf_rele(child, FTAG);
211 }
212 DB_DNODE_EXIT(db);
213 }
214 #endif
215
216 #define ALL -1
217
218 static int
219 free_children(dmu_buf_impl_t *db, uint64_t blkid, uint64_t nblks, int trunc,
220 dmu_tx_t *tx)
221 {
222 dnode_t *dn;
223 blkptr_t *bp;
224 dmu_buf_impl_t *subdb;
225 uint64_t start, end, dbstart, dbend, i;
226 int epbs, shift, err;
227 int all = TRUE;
228 int blocks_freed = 0;
229
230 /*
231 * There is a small possibility that this block will not be cached:
232 * 1 - if level > 1 and there are no children with level <= 1
233 * 2 - if we didn't get a dirty hold (because this block had just
234 * finished being written -- and so had no holds), and then this
235 * block got evicted before we got here.
236 */
237 if (db->db_state != DB_CACHED)
238 (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED);
239
240 dbuf_release_bp(db);
241 bp = (blkptr_t *)db->db.db_data;
242
243 DB_DNODE_ENTER(db);
244 dn = DB_DNODE(db);
245 epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
246 shift = (db->db_level - 1) * epbs;
247 dbstart = db->db_blkid << epbs;
248 start = blkid >> shift;
249 if (dbstart < start) {
250 bp += start - dbstart;
251 all = FALSE;
252 } else {
253 start = dbstart;
254 }
255 dbend = ((db->db_blkid + 1) << epbs) - 1;
256 end = (blkid + nblks - 1) >> shift;
257 if (dbend <= end)
258 end = dbend;
259 else if (all)
260 all = trunc;
261 ASSERT3U(start, <=, end);
262
263 if (db->db_level == 1) {
264 FREE_VERIFY(db, start, end, tx);
265 blocks_freed = free_blocks(dn, bp, end-start+1, tx);
266 arc_buf_freeze(db->db_buf);
267 ASSERT(all || blocks_freed == 0 || db->db_last_dirty);
268 DB_DNODE_EXIT(db);
269 return (all ? ALL : blocks_freed);
270 }
271
272 for (i = start; i <= end; i++, bp++) {
273 if (BP_IS_HOLE(bp))
274 continue;
275 rw_enter(&dn->dn_struct_rwlock, RW_READER);
276 err = dbuf_hold_impl(dn, db->db_level-1, i, TRUE, FTAG, &subdb);
277 ASSERT0(err);
278 rw_exit(&dn->dn_struct_rwlock);
279
280 if (free_children(subdb, blkid, nblks, trunc, tx) == ALL) {
281 ASSERT3P(subdb->db_blkptr, ==, bp);
282 blocks_freed += free_blocks(dn, bp, 1, tx);
283 } else {
284 all = FALSE;
285 }
286 dbuf_rele(subdb, FTAG);
287 }
288 DB_DNODE_EXIT(db);
289 arc_buf_freeze(db->db_buf);
290 #ifdef ZFS_DEBUG
291 bp -= (end-start)+1;
292 for (i = start; i <= end; i++, bp++) {
293 if (i == start && blkid != 0)
294 continue;
295 else if (i == end && !trunc)
296 continue;
297 ASSERT0(bp->blk_birth);
298 }
299 #endif
300 ASSERT(all || blocks_freed == 0 || db->db_last_dirty);
301 return (all ? ALL : blocks_freed);
302 }
303
304 /*
305 * free_range: Traverse the indicated range of the provided file
306 * and "free" all the blocks contained there.
307 */
308 static void
309 dnode_sync_free_range(dnode_t *dn, uint64_t blkid, uint64_t nblks, dmu_tx_t *tx)
310 {
311 blkptr_t *bp = dn->dn_phys->dn_blkptr;
312 dmu_buf_impl_t *db;
313 int trunc, start, end, shift, i, err;
314 int dnlevel = dn->dn_phys->dn_nlevels;
315
316 if (blkid > dn->dn_phys->dn_maxblkid)
317 return;
318
319 ASSERT(dn->dn_phys->dn_maxblkid < UINT64_MAX);
320 trunc = blkid + nblks > dn->dn_phys->dn_maxblkid;
321 if (trunc)
322 nblks = dn->dn_phys->dn_maxblkid - blkid + 1;
323
324 /* There are no indirect blocks in the object */
325 if (dnlevel == 1) {
326 if (blkid >= dn->dn_phys->dn_nblkptr) {
327 /* this range was never made persistent */
328 return;
329 }
330 ASSERT3U(blkid + nblks, <=, dn->dn_phys->dn_nblkptr);
331 (void) free_blocks(dn, bp + blkid, nblks, tx);
332 if (trunc) {
333 uint64_t off = (dn->dn_phys->dn_maxblkid + 1) *
334 (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT);
335 dn->dn_phys->dn_maxblkid = (blkid ? blkid - 1 : 0);
336 ASSERT(off < dn->dn_phys->dn_maxblkid ||
337 dn->dn_phys->dn_maxblkid == 0 ||
338 dnode_next_offset(dn, 0, &off, 1, 1, 0) != 0);
339 }
340 return;
341 }
342
343 shift = (dnlevel - 1) * (dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT);
344 start = blkid >> shift;
345 ASSERT(start < dn->dn_phys->dn_nblkptr);
346 end = (blkid + nblks - 1) >> shift;
347 bp += start;
348 for (i = start; i <= end; i++, bp++) {
349 if (BP_IS_HOLE(bp))
350 continue;
351 rw_enter(&dn->dn_struct_rwlock, RW_READER);
352 err = dbuf_hold_impl(dn, dnlevel-1, i, TRUE, FTAG, &db);
353 ASSERT0(err);
354 rw_exit(&dn->dn_struct_rwlock);
355
356 if (free_children(db, blkid, nblks, trunc, tx) == ALL) {
357 ASSERT3P(db->db_blkptr, ==, bp);
358 (void) free_blocks(dn, bp, 1, tx);
359 }
360 dbuf_rele(db, FTAG);
361 }
362 if (trunc) {
363 uint64_t off = (dn->dn_phys->dn_maxblkid + 1) *
364 (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT);
365 dn->dn_phys->dn_maxblkid = (blkid ? blkid - 1 : 0);
366 ASSERT(off < dn->dn_phys->dn_maxblkid ||
367 dn->dn_phys->dn_maxblkid == 0 ||
368 dnode_next_offset(dn, 0, &off, 1, 1, 0) != 0);
369 }
370 }
371
372 /*
373 * Try to kick all the dnodes dbufs out of the cache...
374 */
375 void
376 dnode_evict_dbufs(dnode_t *dn)
377 {
378 int progress;
379 int pass = 0;
380 list_t evict_list;
381
382 dmu_buf_create_user_evict_list(&evict_list);
383
384 do {
385 dmu_buf_impl_t *db, marker;
386 int evicting = FALSE;
387
388 progress = FALSE;
389 mutex_enter(&dn->dn_dbufs_mtx);
390 list_insert_tail(&dn->dn_dbufs, &marker);
391 db = list_head(&dn->dn_dbufs);
392 for (; db != ▮ db = list_head(&dn->dn_dbufs)) {
393 list_remove(&dn->dn_dbufs, db);
394 list_insert_tail(&dn->dn_dbufs, db);
395 #ifdef DEBUG
396 DB_DNODE_ENTER(db);
397 ASSERT3P(DB_DNODE(db), ==, dn);
398 DB_DNODE_EXIT(db);
399 #endif /* DEBUG */
400
401 mutex_enter(&db->db_mtx);
402 if (db->db_state == DB_EVICTING) {
403 progress = TRUE;
404 evicting = TRUE;
405 mutex_exit(&db->db_mtx);
406 } else if (refcount_is_zero(&db->db_holds)) {
407 progress = TRUE;
408 dbuf_clear(db, &evict_list); /* exits db_mtx */
409 } else {
410 mutex_exit(&db->db_mtx);
411 }
412 ASSERT(MUTEX_NOT_HELD(&db->db_mtx));
413 dmu_buf_process_user_evicts(&evict_list);
414 }
415 list_remove(&dn->dn_dbufs, &marker);
416 /*
417 * NB: we need to drop dn_dbufs_mtx between passes so
418 * that any DB_EVICTING dbufs can make progress.
419 * Ideally, we would have some cv we could wait on, but
420 * since we don't, just wait a bit to give the other
421 * thread a chance to run.
422 */
423 mutex_exit(&dn->dn_dbufs_mtx);
424 if (evicting)
425 delay(1);
426 pass++;
427 ASSERT(pass < 100); /* sanity check */
428 } while (progress);
429
430 rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
431 if (dn->dn_bonus && refcount_is_zero(&dn->dn_bonus->db_holds)) {
432 mutex_enter(&dn->dn_bonus->db_mtx);
433 dbuf_evict(dn->dn_bonus, &evict_list);
434 dn->dn_bonus = NULL;
435 }
436 rw_exit(&dn->dn_struct_rwlock);
437 dmu_buf_destroy_user_evict_list(&evict_list);
438 }
439
440 static void
441 dnode_undirty_dbufs(list_t *list)
442 {
443 dbuf_dirty_record_t *dr;
444
445 while (dr = list_head(list)) {
446 dmu_buf_impl_t *db = dr->dr_dbuf;
447 uint64_t txg = dr->dr_txg;
448
449 if (db->db_level != 0)
450 dnode_undirty_dbufs(&dr->dt.di.dr_children);
451
452 mutex_enter(&db->db_mtx);
453 /* XXX - use dbuf_undirty()? */
454 list_remove(list, dr);
455 ASSERT(db->db_last_dirty == dr);
456 db->db_last_dirty = NULL;
457 db->db_dirtycnt -= 1;
458 if (db->db_level == 0) {
459 ASSERT(db->db_blkid == DMU_BONUS_BLKID ||
460 dr->dt.dl.dr_data == db->db_buf);
461 dbuf_unoverride(dr);
462 }
463 kmem_free(dr, sizeof (dbuf_dirty_record_t));
464 dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg);
465 }
466 }
467
468 static void
469 dnode_sync_free(dnode_t *dn, dmu_tx_t *tx)
470 {
471 int txgoff = tx->tx_txg & TXG_MASK;
472
473 ASSERT(dmu_tx_is_syncing(tx));
474
475 /*
476 * Our contents should have been freed in dnode_sync() by the
477 * free range record inserted by the caller of dnode_free().
478 */
479 ASSERT0(DN_USED_BYTES(dn->dn_phys));
480 ASSERT(BP_IS_HOLE(dn->dn_phys->dn_blkptr));
481
482 dnode_undirty_dbufs(&dn->dn_dirty_records[txgoff]);
483 dnode_evict_dbufs(dn);
484 ASSERT3P(list_head(&dn->dn_dbufs), ==, NULL);
485 ASSERT3P(dn->dn_bonus, ==, NULL);
486
487 /*
488 * XXX - It would be nice to assert this, but we may still
489 * have residual holds from async evictions from the arc...
490 *
491 * zfs_obj_to_path() also depends on this being
492 * commented out.
493 *
494 * ASSERT3U(refcount_count(&dn->dn_holds), ==, 1);
495 */
496
497 /* Undirty next bits */
498 dn->dn_next_nlevels[txgoff] = 0;
499 dn->dn_next_indblkshift[txgoff] = 0;
500 dn->dn_next_blksz[txgoff] = 0;
501
502 /* ASSERT(blkptrs are zero); */
503 ASSERT(dn->dn_phys->dn_type != DMU_OT_NONE);
504 ASSERT(dn->dn_type != DMU_OT_NONE);
505
506 ASSERT(dn->dn_free_txg > 0);
507 if (dn->dn_allocated_txg != dn->dn_free_txg)
508 dbuf_will_dirty(dn->dn_dbuf, tx);
509 bzero(dn->dn_phys, sizeof (dnode_phys_t));
510
511 mutex_enter(&dn->dn_mtx);
512 dn->dn_type = DMU_OT_NONE;
513 dn->dn_maxblkid = 0;
514 dn->dn_allocated_txg = 0;
515 dn->dn_free_txg = 0;
516 dn->dn_have_spill = B_FALSE;
517 mutex_exit(&dn->dn_mtx);
518
519 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
520
521 dnode_rele(dn, (void *)(uintptr_t)tx->tx_txg);
522 /*
523 * Now that we've released our hold, the dnode may
524 * be evicted, so we musn't access it.
525 */
526 }
527
528 /*
529 * Write out the dnode's dirty buffers.
530 */
531 void
532 dnode_sync(dnode_t *dn, dmu_tx_t *tx)
533 {
534 free_range_t *rp;
535 dnode_phys_t *dnp = dn->dn_phys;
536 int txgoff = tx->tx_txg & TXG_MASK;
537 list_t *list = &dn->dn_dirty_records[txgoff];
538 static const dnode_phys_t zerodn = { 0 };
539 boolean_t kill_spill = B_FALSE;
540
541 ASSERT(dmu_tx_is_syncing(tx));
542 ASSERT(dnp->dn_type != DMU_OT_NONE || dn->dn_allocated_txg);
543 ASSERT(dnp->dn_type != DMU_OT_NONE ||
544 bcmp(dnp, &zerodn, DNODE_SIZE) == 0);
545 DNODE_VERIFY(dn);
546
547 ASSERT(dn->dn_dbuf == NULL || arc_released(dn->dn_dbuf->db_buf));
548
549 if (dmu_objset_userused_enabled(dn->dn_objset) &&
550 !DMU_OBJECT_IS_SPECIAL(dn->dn_object)) {
551 mutex_enter(&dn->dn_mtx);
552 dn->dn_oldused = DN_USED_BYTES(dn->dn_phys);
553 dn->dn_oldflags = dn->dn_phys->dn_flags;
554 dn->dn_phys->dn_flags |= DNODE_FLAG_USERUSED_ACCOUNTED;
555 mutex_exit(&dn->dn_mtx);
556 dmu_objset_userquota_get_ids(dn, B_FALSE, tx);
557 } else {
558 /* Once we account for it, we should always account for it. */
559 ASSERT(!(dn->dn_phys->dn_flags &
560 DNODE_FLAG_USERUSED_ACCOUNTED));
561 }
562
563 mutex_enter(&dn->dn_mtx);
564 if (dn->dn_allocated_txg == tx->tx_txg) {
565 /* The dnode is newly allocated or reallocated */
566 if (dnp->dn_type == DMU_OT_NONE) {
567 /* this is a first alloc, not a realloc */
568 dnp->dn_nlevels = 1;
569 dnp->dn_nblkptr = dn->dn_nblkptr;
570 }
571
572 dnp->dn_type = dn->dn_type;
573 dnp->dn_bonustype = dn->dn_bonustype;
574 dnp->dn_bonuslen = dn->dn_bonuslen;
575 }
576
577 ASSERT(dnp->dn_nlevels > 1 ||
578 BP_IS_HOLE(&dnp->dn_blkptr[0]) ||
579 BP_GET_LSIZE(&dnp->dn_blkptr[0]) ==
580 dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
581
582 if (dn->dn_next_blksz[txgoff]) {
583 ASSERT(P2PHASE(dn->dn_next_blksz[txgoff],
584 SPA_MINBLOCKSIZE) == 0);
585 ASSERT(BP_IS_HOLE(&dnp->dn_blkptr[0]) ||
586 dn->dn_maxblkid == 0 || list_head(list) != NULL ||
587 avl_last(&dn->dn_ranges[txgoff]) ||
588 dn->dn_next_blksz[txgoff] >> SPA_MINBLOCKSHIFT ==
589 dnp->dn_datablkszsec);
590 dnp->dn_datablkszsec =
591 dn->dn_next_blksz[txgoff] >> SPA_MINBLOCKSHIFT;
592 dn->dn_next_blksz[txgoff] = 0;
593 }
594
595 if (dn->dn_next_bonuslen[txgoff]) {
596 if (dn->dn_next_bonuslen[txgoff] == DN_ZERO_BONUSLEN)
597 dnp->dn_bonuslen = 0;
598 else
599 dnp->dn_bonuslen = dn->dn_next_bonuslen[txgoff];
600 ASSERT(dnp->dn_bonuslen <= DN_MAX_BONUSLEN);
601 dn->dn_next_bonuslen[txgoff] = 0;
602 }
603
604 if (dn->dn_next_bonustype[txgoff]) {
605 ASSERT(DMU_OT_IS_VALID(dn->dn_next_bonustype[txgoff]));
606 dnp->dn_bonustype = dn->dn_next_bonustype[txgoff];
607 dn->dn_next_bonustype[txgoff] = 0;
608 }
609
610 /*
611 * We will either remove a spill block when a file is being removed
612 * or we have been asked to remove it.
613 */
614 if (dn->dn_rm_spillblk[txgoff] ||
615 ((dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) &&
616 dn->dn_free_txg > 0 && dn->dn_free_txg <= tx->tx_txg)) {
617 if ((dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR))
618 kill_spill = B_TRUE;
619 dn->dn_rm_spillblk[txgoff] = 0;
620 }
621
622 if (dn->dn_next_indblkshift[txgoff]) {
623 ASSERT(dnp->dn_nlevels == 1);
624 dnp->dn_indblkshift = dn->dn_next_indblkshift[txgoff];
625 dn->dn_next_indblkshift[txgoff] = 0;
626 }
627
628 /*
629 * Just take the live (open-context) values for checksum and compress.
630 * Strictly speaking it's a future leak, but nothing bad happens if we
631 * start using the new checksum or compress algorithm a little early.
632 */
633 dnp->dn_checksum = dn->dn_checksum;
634 dnp->dn_compress = dn->dn_compress;
635
636 mutex_exit(&dn->dn_mtx);
637
638 if (kill_spill) {
639 (void) free_blocks(dn, &dn->dn_phys->dn_spill, 1, tx);
640 mutex_enter(&dn->dn_mtx);
641 dnp->dn_flags &= ~DNODE_FLAG_SPILL_BLKPTR;
642 mutex_exit(&dn->dn_mtx);
643 }
644
645 /* process all the "freed" ranges in the file */
646 while (rp = avl_last(&dn->dn_ranges[txgoff])) {
647 dnode_sync_free_range(dn, rp->fr_blkid, rp->fr_nblks, tx);
648 /* grab the mutex so we don't race with dnode_block_freed() */
649 mutex_enter(&dn->dn_mtx);
650 avl_remove(&dn->dn_ranges[txgoff], rp);
651 mutex_exit(&dn->dn_mtx);
652 kmem_free(rp, sizeof (free_range_t));
653 }
654
655 if (dn->dn_free_txg > 0 && dn->dn_free_txg <= tx->tx_txg) {
656 dnode_sync_free(dn, tx);
657 return;
658 }
659
660 if (dn->dn_next_nblkptr[txgoff]) {
661 /* this should only happen on a realloc */
662 ASSERT(dn->dn_allocated_txg == tx->tx_txg);
663 if (dn->dn_next_nblkptr[txgoff] > dnp->dn_nblkptr) {
664 /* zero the new blkptrs we are gaining */
665 bzero(dnp->dn_blkptr + dnp->dn_nblkptr,
666 sizeof (blkptr_t) *
667 (dn->dn_next_nblkptr[txgoff] - dnp->dn_nblkptr));
668 #ifdef ZFS_DEBUG
669 } else {
670 int i;
671 ASSERT(dn->dn_next_nblkptr[txgoff] < dnp->dn_nblkptr);
672 /* the blkptrs we are losing better be unallocated */
673 for (i = dn->dn_next_nblkptr[txgoff];
674 i < dnp->dn_nblkptr; i++)
675 ASSERT(BP_IS_HOLE(&dnp->dn_blkptr[i]));
676 #endif
677 }
678 mutex_enter(&dn->dn_mtx);
679 dnp->dn_nblkptr = dn->dn_next_nblkptr[txgoff];
680 dn->dn_next_nblkptr[txgoff] = 0;
681 mutex_exit(&dn->dn_mtx);
682 }
683
684 if (dn->dn_next_nlevels[txgoff]) {
685 dnode_increase_indirection(dn, tx);
686 dn->dn_next_nlevels[txgoff] = 0;
687 }
688
689 dbuf_sync_list(list, tx);
690
691 if (!DMU_OBJECT_IS_SPECIAL(dn->dn_object)) {
692 ASSERT3P(list_head(list), ==, NULL);
693 dnode_rele(dn, (void *)(uintptr_t)tx->tx_txg);
694 }
695
696 /*
697 * Although we have dropped our reference to the dnode, it
698 * can't be evicted until its written, and we haven't yet
699 * initiated the IO for the dnode's dbuf.
700 */
701 }