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📄 Makefile.in(4.57 KB)
📄 THIRDPARTYLICENSE.cityhash(1.03 KB)
📄 THIRDPARTYLICENSE.cityhash.descrip(39 B)
📄 abd.c(31.72 KB)
📄 aggsum.c(8.46 KB)
📄 arc.c(330.91 KB)
📄 blkptr.c(4.26 KB)
📄 bplist.c(2.38 KB)
📄 bpobj.c(27.82 KB)
📄 bptree.c(8.2 KB)
📄 bqueue.c(4.7 KB)
📄 btree.c(65.19 KB)
📄 dataset_kstats.c(6.32 KB)
📄 dbuf.c(141.84 KB)
📄 dbuf_stats.c(6.05 KB)
📄 ddt.c(28.01 KB)
📄 ddt_zap.c(4.38 KB)
📄 dmu.c(60.44 KB)
📄 dmu_diff.c(6.25 KB)
📄 dmu_object.c(14.73 KB)
📄 dmu_objset.c(79.38 KB)
📄 dmu_recv.c(98.69 KB)
📄 dmu_redact.c(37.09 KB)
📄 dmu_send.c(95.51 KB)
📄 dmu_traverse.c(21.98 KB)
📄 dmu_tx.c(40.13 KB)
📄 dmu_zfetch.c(13.56 KB)
📄 dnode.c(71.32 KB)
📄 dnode_sync.c(24.93 KB)
📄 dsl_bookmark.c(51.22 KB)
📄 dsl_crypt.c(78.06 KB)
📄 dsl_dataset.c(141.61 KB)
📄 dsl_deadlist.c(27.94 KB)
📄 dsl_deleg.c(19.92 KB)
📄 dsl_destroy.c(36.73 KB)
📄 dsl_dir.c(65.45 KB)
📄 dsl_pool.c(42.92 KB)
📄 dsl_prop.c(32.88 KB)
📄 dsl_scan.c(134.47 KB)
📄 dsl_synctask.c(7.94 KB)
📄 dsl_userhold.c(18.26 KB)
📄 edonr_zfs.c(3.21 KB)
📄 fm.c(39.75 KB)
📄 gzip.c(2.57 KB)
📄 hkdf.c(4.5 KB)
📄 lz4.c(26.46 KB)
📄 lzjb.c(3.85 KB)
📄 metaslab.c(190.62 KB)
📄 mmp.c(24.93 KB)
📄 multilist.c(12.21 KB)
📄 objlist.c(2.58 KB)
📄 pathname.c(2.52 KB)
📄 range_tree.c(24.9 KB)
📄 refcount.c(7.82 KB)
📄 rrwlock.c(10.82 KB)
📄 sa.c(59.23 KB)
📄 sha256.c(2.89 KB)
📄 skein_zfs.c(2.92 KB)
📄 spa.c(272.81 KB)
📄 spa_boot.c(1.28 KB)
📄 spa_checkpoint.c(21.54 KB)
📄 spa_config.c(16.97 KB)
📄 spa_errlog.c(11.35 KB)
📄 spa_history.c(17.75 KB)
📄 spa_log_spacemap.c(47.13 KB)
📄 spa_misc.c(75.4 KB)
📄 spa_stats.c(27.08 KB)
📄 space_map.c(31.45 KB)
📄 space_reftree.c(4.21 KB)
📄 txg.c(27.49 KB)
📄 uberblock.c(2.17 KB)
📄 unique.c(2.53 KB)
📄 vdev.c(143.91 KB)
📄 vdev_cache.c(11.71 KB)
📄 vdev_draid.c(96.86 KB)
📄 vdev_draid_rand.c(1.16 KB)
📄 vdev_indirect.c(60.83 KB)
📄 vdev_indirect_births.c(5.88 KB)
📄 vdev_indirect_mapping.c(18.06 KB)
📄 vdev_initialize.c(22.38 KB)
📄 vdev_label.c(57.52 KB)
📄 vdev_mirror.c(26.76 KB)
📄 vdev_missing.c(3.74 KB)
📄 vdev_queue.c(37.61 KB)
📄 vdev_raidz.c(76.09 KB)
📄 vdev_raidz_math.c(17.18 KB)
📄 vdev_raidz_math_aarch64_neon.c(112.13 KB)
📄 vdev_raidz_math_aarch64_neon_common.h(23.64 KB)
📄 vdev_raidz_math_aarch64_neonx2.c(5.39 KB)
📄 vdev_raidz_math_avx2.c(10.64 KB)
📄 vdev_raidz_math_avx512bw.c(10.93 KB)
📄 vdev_raidz_math_avx512f.c(17.9 KB)
📄 vdev_raidz_math_impl.h(34.78 KB)
📄 vdev_raidz_math_powerpc_altivec.c(213.46 KB)
📄 vdev_raidz_math_powerpc_altivec_common.h(22.62 KB)
📄 vdev_raidz_math_scalar.c(9.54 KB)
📄 vdev_raidz_math_sse2.c(25.84 KB)
📄 vdev_raidz_math_ssse3.c(118 KB)
📄 vdev_rebuild.c(34.65 KB)
📄 vdev_removal.c(72.08 KB)
📄 vdev_root.c(4.28 KB)
📄 vdev_trim.c(50.92 KB)
📄 zap.c(35.35 KB)
📄 zap_leaf.c(22.75 KB)
📄 zap_micro.c(42.18 KB)
📄 zcp.c(42.29 KB)
📄 zcp_get.c(21.01 KB)
📄 zcp_global.c(1.9 KB)
📄 zcp_iter.c(18.21 KB)
📄 zcp_set.c(2.37 KB)
📄 zcp_synctask.c(13.69 KB)
📄 zfeature.c(17.6 KB)
📄 zfs_byteswap.c(5.64 KB)
📄 zfs_fm.c(40.58 KB)
📄 zfs_fuid.c(19.69 KB)
📄 zfs_ioctl.c(195.48 KB)
📄 zfs_log.c(20.6 KB)
📄 zfs_onexit.c(5.09 KB)
📄 zfs_quota.c(12.93 KB)
📄 zfs_ratelimit.c(2.35 KB)
📄 zfs_replay.c(26.11 KB)
📄 zfs_rlock.c(20.38 KB)
📄 zfs_sa.c(13.09 KB)
📄 zfs_vnops.c(22 KB)
📄 zil.c(111.32 KB)
📄 zio.c(144.72 KB)
📄 zio_checksum.c(17.28 KB)
📄 zio_compress.c(5.92 KB)
📄 zio_inject.c(25.79 KB)
📄 zle.c(2.52 KB)
📄 zrlock.c(4.45 KB)
📄 zthr.c(16.41 KB)
📄 zvol.c(42.96 KB)

Editing: dnode_sync.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2012, 2020 by Delphix. All rights reserved.
 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
 * Copyright 2020 Oxide Computer Company
 */

#include <sys/zfs_context.h>
#include <sys/dbuf.h>
#include <sys/dnode.h>
#include <sys/dmu.h>
#include <sys/dmu_tx.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_recv.h>
#include <sys/dsl_dataset.h>
#include <sys/spa.h>
#include <sys/range_tree.h>
#include <sys/zfeature.h>

static void
dnode_increase_indirection(dnode_t *dn, dmu_tx_t *tx)
{
	dmu_buf_impl_t *db;
	int txgoff = tx->tx_txg & TXG_MASK;
	int nblkptr = dn->dn_phys->dn_nblkptr;
	int old_toplvl = dn->dn_phys->dn_nlevels - 1;
	int new_level = dn->dn_next_nlevels[txgoff];
	int i;

rw_enter(&dn->dn_struct_rwlock, RW_WRITER);

/* this dnode can't be paged out because it's dirty */
	ASSERT(dn->dn_phys->dn_type != DMU_OT_NONE);
	ASSERT(new_level > 1 && dn->dn_phys->dn_nlevels > 0);

db = dbuf_hold_level(dn, dn->dn_phys->dn_nlevels, 0, FTAG);
	ASSERT(db != NULL);

dn->dn_phys->dn_nlevels = new_level;
	dprintf("os=%p obj=%llu, increase to %d\n", dn->dn_objset,
	    dn->dn_object, dn->dn_phys->dn_nlevels);

/*
	 * Lock ordering requires that we hold the children's db_mutexes (by
	 * calling dbuf_find()) before holding the parent's db_rwlock.  The lock
	 * order is imposed by dbuf_read's steps of "grab the lock to protect
	 * db_parent, get db_parent, hold db_parent's db_rwlock".
	 */
	dmu_buf_impl_t *children[DN_MAX_NBLKPTR];
	ASSERT3U(nblkptr, <=, DN_MAX_NBLKPTR);
	for (i = 0; i < nblkptr; i++) {
		children[i] =
		    dbuf_find(dn->dn_objset, dn->dn_object, old_toplvl, i);
	}

/* transfer dnode's block pointers to new indirect block */
	(void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED|DB_RF_HAVESTRUCT);
	if (dn->dn_dbuf != NULL)
		rw_enter(&dn->dn_dbuf->db_rwlock, RW_WRITER);
	rw_enter(&db->db_rwlock, RW_WRITER);
	ASSERT(db->db.db_data);
	ASSERT(arc_released(db->db_buf));
	ASSERT3U(sizeof (blkptr_t) * nblkptr, <=, db->db.db_size);
	bcopy(dn->dn_phys->dn_blkptr, db->db.db_data,
	    sizeof (blkptr_t) * nblkptr);
	arc_buf_freeze(db->db_buf);

/* set dbuf's parent pointers to new indirect buf */
	for (i = 0; i < nblkptr; i++) {
		dmu_buf_impl_t *child = children[i];

if (child == NULL)
			continue;
#ifdef	ZFS_DEBUG
		DB_DNODE_ENTER(child);
		ASSERT3P(DB_DNODE(child), ==, dn);
		DB_DNODE_EXIT(child);
#endif	/* DEBUG */
		if (child->db_parent && child->db_parent != dn->dn_dbuf) {
			ASSERT(child->db_parent->db_level == db->db_level);
			ASSERT(child->db_blkptr !=
			    &dn->dn_phys->dn_blkptr[child->db_blkid]);
			mutex_exit(&child->db_mtx);
			continue;
		}
		ASSERT(child->db_parent == NULL ||
		    child->db_parent == dn->dn_dbuf);

child->db_parent = db;
		dbuf_add_ref(db, child);
		if (db->db.db_data)
			child->db_blkptr = (blkptr_t *)db->db.db_data + i;
		else
			child->db_blkptr = NULL;
		dprintf_dbuf_bp(child, child->db_blkptr,
		    "changed db_blkptr to new indirect %s", "");

mutex_exit(&child->db_mtx);
	}

bzero(dn->dn_phys->dn_blkptr, sizeof (blkptr_t) * nblkptr);

rw_exit(&db->db_rwlock);
	if (dn->dn_dbuf != NULL)
		rw_exit(&dn->dn_dbuf->db_rwlock);

dbuf_rele(db, FTAG);

rw_exit(&dn->dn_struct_rwlock);
}

static void
free_blocks(dnode_t *dn, blkptr_t *bp, int num, dmu_tx_t *tx)
{
	dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset;
	uint64_t bytesfreed = 0;

dprintf("ds=%p obj=%llx num=%d\n", ds, dn->dn_object, num);

for (int i = 0; i < num; i++, bp++) {
		if (BP_IS_HOLE(bp))
			continue;

bytesfreed += dsl_dataset_block_kill(ds, bp, tx, B_FALSE);
		ASSERT3U(bytesfreed, <=, DN_USED_BYTES(dn->dn_phys));

/*
		 * Save some useful information on the holes being
		 * punched, including logical size, type, and indirection
		 * level. Retaining birth time enables detection of when
		 * holes are punched for reducing the number of free
		 * records transmitted during a zfs send.
		 */

uint64_t lsize = BP_GET_LSIZE(bp);
		dmu_object_type_t type = BP_GET_TYPE(bp);
		uint64_t lvl = BP_GET_LEVEL(bp);

bzero(bp, sizeof (blkptr_t));

if (spa_feature_is_active(dn->dn_objset->os_spa,
		    SPA_FEATURE_HOLE_BIRTH)) {
			BP_SET_LSIZE(bp, lsize);
			BP_SET_TYPE(bp, type);
			BP_SET_LEVEL(bp, lvl);
			BP_SET_BIRTH(bp, dmu_tx_get_txg(tx), 0);
		}
	}
	dnode_diduse_space(dn, -bytesfreed);
}

#ifdef ZFS_DEBUG
static void
free_verify(dmu_buf_impl_t *db, uint64_t start, uint64_t end, dmu_tx_t *tx)
{
	int off, num;
	int i, err, epbs;
	uint64_t txg = tx->tx_txg;
	dnode_t *dn;

DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);
	epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
	off = start - (db->db_blkid * 1<<epbs);
	num = end - start + 1;

ASSERT3U(off, >=, 0);
	ASSERT3U(num, >=, 0);
	ASSERT3U(db->db_level, >, 0);
	ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift);
	ASSERT3U(off+num, <=, db->db.db_size >> SPA_BLKPTRSHIFT);
	ASSERT(db->db_blkptr != NULL);

for (i = off; i < off+num; i++) {
		uint64_t *buf;
		dmu_buf_impl_t *child;
		dbuf_dirty_record_t *dr;
		int j;

ASSERT(db->db_level == 1);

rw_enter(&dn->dn_struct_rwlock, RW_READER);
		err = dbuf_hold_impl(dn, db->db_level - 1,
		    (db->db_blkid << epbs) + i, TRUE, FALSE, FTAG, &child);
		rw_exit(&dn->dn_struct_rwlock);
		if (err == ENOENT)
			continue;
		ASSERT(err == 0);
		ASSERT(child->db_level == 0);
		dr = dbuf_find_dirty_eq(child, txg);

/* data_old better be zeroed */
		if (dr) {
			buf = dr->dt.dl.dr_data->b_data;
			for (j = 0; j < child->db.db_size >> 3; j++) {
				if (buf[j] != 0) {
					panic("freed data not zero: "
					    "child=%p i=%d off=%d num=%d\n",
					    (void *)child, i, off, num);
				}
			}
		}

/*
		 * db_data better be zeroed unless it's dirty in a
		 * future txg.
		 */
		mutex_enter(&child->db_mtx);
		buf = child->db.db_data;
		if (buf != NULL && child->db_state != DB_FILL &&
		    list_is_empty(&child->db_dirty_records)) {
			for (j = 0; j < child->db.db_size >> 3; j++) {
				if (buf[j] != 0) {
					panic("freed data not zero: "
					    "child=%p i=%d off=%d num=%d\n",
					    (void *)child, i, off, num);
				}
			}
		}
		mutex_exit(&child->db_mtx);

dbuf_rele(child, FTAG);
	}
	DB_DNODE_EXIT(db);
}
#endif

/*
 * We don't usually free the indirect blocks here.  If in one txg we have a
 * free_range and a write to the same indirect block, it's important that we
 * preserve the hole's birth times. Therefore, we don't free any any indirect
 * blocks in free_children().  If an indirect block happens to turn into all
 * holes, it will be freed by dbuf_write_children_ready, which happens at a
 * point in the syncing process where we know for certain the contents of the
 * indirect block.
 *
 * However, if we're freeing a dnode, its space accounting must go to zero
 * before we actually try to free the dnode, or we will trip an assertion. In
 * addition, we know the case described above cannot occur, because the dnode is
 * being freed.  Therefore, we free the indirect blocks immediately in that
 * case.
 */
static void
free_children(dmu_buf_impl_t *db, uint64_t blkid, uint64_t nblks,
    boolean_t free_indirects, dmu_tx_t *tx)
{
	dnode_t *dn;
	blkptr_t *bp;
	dmu_buf_impl_t *subdb;
	uint64_t start, end, dbstart, dbend;
	unsigned int epbs, shift, i;

/*
	 * There is a small possibility that this block will not be cached:
	 *   1 - if level > 1 and there are no children with level <= 1
	 *   2 - if this block was evicted since we read it from
	 *	 dmu_tx_hold_free().
	 */
	if (db->db_state != DB_CACHED)
		(void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED);

/*
	 * If we modify this indirect block, and we are not freeing the
	 * dnode (!free_indirects), then this indirect block needs to get
	 * written to disk by dbuf_write().  If it is dirty, we know it will
	 * be written (otherwise, we would have incorrect on-disk state
	 * because the space would be freed but still referenced by the BP
	 * in this indirect block).  Therefore we VERIFY that it is
	 * dirty.
	 *
	 * Our VERIFY covers some cases that do not actually have to be
	 * dirty, but the open-context code happens to dirty.  E.g. if the
	 * blocks we are freeing are all holes, because in that case, we
	 * are only freeing part of this indirect block, so it is an
	 * ancestor of the first or last block to be freed.  The first and
	 * last L1 indirect blocks are always dirtied by dnode_free_range().
	 */
	db_lock_type_t dblt = dmu_buf_lock_parent(db, RW_READER, FTAG);
	VERIFY(BP_GET_FILL(db->db_blkptr) == 0 || db->db_dirtycnt > 0);
	dmu_buf_unlock_parent(db, dblt, FTAG);

dbuf_release_bp(db);
	bp = db->db.db_data;

DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);
	epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
	ASSERT3U(epbs, <, 31);
	shift = (db->db_level - 1) * epbs;
	dbstart = db->db_blkid << epbs;
	start = blkid >> shift;
	if (dbstart < start) {
		bp += start - dbstart;
	} else {
		start = dbstart;
	}
	dbend = ((db->db_blkid + 1) << epbs) - 1;
	end = (blkid + nblks - 1) >> shift;
	if (dbend <= end)
		end = dbend;

ASSERT3U(start, <=, end);

if (db->db_level == 1) {
		FREE_VERIFY(db, start, end, tx);
		rw_enter(&db->db_rwlock, RW_WRITER);
		free_blocks(dn, bp, end - start + 1, tx);
		rw_exit(&db->db_rwlock);
	} else {
		for (uint64_t id = start; id <= end; id++, bp++) {
			if (BP_IS_HOLE(bp))
				continue;
			rw_enter(&dn->dn_struct_rwlock, RW_READER);
			VERIFY0(dbuf_hold_impl(dn, db->db_level - 1,
			    id, TRUE, FALSE, FTAG, &subdb));
			rw_exit(&dn->dn_struct_rwlock);
			ASSERT3P(bp, ==, subdb->db_blkptr);

free_children(subdb, blkid, nblks, free_indirects, tx);
			dbuf_rele(subdb, FTAG);
		}
	}

if (free_indirects) {
		rw_enter(&db->db_rwlock, RW_WRITER);
		for (i = 0, bp = db->db.db_data; i < 1 << epbs; i++, bp++)
			ASSERT(BP_IS_HOLE(bp));
		bzero(db->db.db_data, db->db.db_size);
		free_blocks(dn, db->db_blkptr, 1, tx);
		rw_exit(&db->db_rwlock);
	}

DB_DNODE_EXIT(db);
	arc_buf_freeze(db->db_buf);
}

/*
 * Traverse the indicated range of the provided file
 * and "free" all the blocks contained there.
 */
static void
dnode_sync_free_range_impl(dnode_t *dn, uint64_t blkid, uint64_t nblks,
    boolean_t free_indirects, dmu_tx_t *tx)
{
	blkptr_t *bp = dn->dn_phys->dn_blkptr;
	int dnlevel = dn->dn_phys->dn_nlevels;
	boolean_t trunc = B_FALSE;

if (blkid > dn->dn_phys->dn_maxblkid)
		return;

ASSERT(dn->dn_phys->dn_maxblkid < UINT64_MAX);
	if (blkid + nblks > dn->dn_phys->dn_maxblkid) {
		nblks = dn->dn_phys->dn_maxblkid - blkid + 1;
		trunc = B_TRUE;
	}

/* There are no indirect blocks in the object */
	if (dnlevel == 1) {
		if (blkid >= dn->dn_phys->dn_nblkptr) {
			/* this range was never made persistent */
			return;
		}
		ASSERT3U(blkid + nblks, <=, dn->dn_phys->dn_nblkptr);
		free_blocks(dn, bp + blkid, nblks, tx);
	} else {
		int shift = (dnlevel - 1) *
		    (dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT);
		int start = blkid >> shift;
		int end = (blkid + nblks - 1) >> shift;
		dmu_buf_impl_t *db;

ASSERT(start < dn->dn_phys->dn_nblkptr);
		bp += start;
		for (int i = start; i <= end; i++, bp++) {
			if (BP_IS_HOLE(bp))
				continue;
			rw_enter(&dn->dn_struct_rwlock, RW_READER);
			VERIFY0(dbuf_hold_impl(dn, dnlevel - 1, i,
			    TRUE, FALSE, FTAG, &db));
			rw_exit(&dn->dn_struct_rwlock);
			free_children(db, blkid, nblks, free_indirects, tx);
			dbuf_rele(db, FTAG);
		}
	}

/*
	 * Do not truncate the maxblkid if we are performing a raw
	 * receive. The raw receive sets the maxblkid manually and
	 * must not be overridden. Usually, the last DRR_FREE record
	 * will be at the maxblkid, because the source system sets
	 * the maxblkid when truncating. However, if the last block
	 * was freed by overwriting with zeros and being compressed
	 * away to a hole, the source system will generate a DRR_FREE
	 * record while leaving the maxblkid after the end of that
	 * record. In this case we need to leave the maxblkid as
	 * indicated in the DRR_OBJECT record, so that it matches the
	 * source system, ensuring that the cryptographic hashes will
	 * match.
	 */
	if (trunc && !dn->dn_objset->os_raw_receive) {
		uint64_t off __maybe_unused;
		dn->dn_phys->dn_maxblkid = blkid == 0 ? 0 : blkid - 1;

off = (dn->dn_phys->dn_maxblkid + 1) *
		    (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT);
		ASSERT(off < dn->dn_phys->dn_maxblkid ||
		    dn->dn_phys->dn_maxblkid == 0 ||
		    dnode_next_offset(dn, 0, &off, 1, 1, 0) != 0);
	}
}

typedef struct dnode_sync_free_range_arg {
	dnode_t *dsfra_dnode;
	dmu_tx_t *dsfra_tx;
	boolean_t dsfra_free_indirects;
} dnode_sync_free_range_arg_t;

static void
dnode_sync_free_range(void *arg, uint64_t blkid, uint64_t nblks)
{
	dnode_sync_free_range_arg_t *dsfra = arg;
	dnode_t *dn = dsfra->dsfra_dnode;

mutex_exit(&dn->dn_mtx);
	dnode_sync_free_range_impl(dn, blkid, nblks,
	    dsfra->dsfra_free_indirects, dsfra->dsfra_tx);
	mutex_enter(&dn->dn_mtx);
}

/*
 * Try to kick all the dnode's dbufs out of the cache...
 */
void
dnode_evict_dbufs(dnode_t *dn)
{
	dmu_buf_impl_t *db_marker;
	dmu_buf_impl_t *db, *db_next;

db_marker = kmem_alloc(sizeof (dmu_buf_impl_t), KM_SLEEP);

mutex_enter(&dn->dn_dbufs_mtx);
	for (db = avl_first(&dn->dn_dbufs); db != NULL; db = db_next) {

#ifdef	ZFS_DEBUG
		DB_DNODE_ENTER(db);
		ASSERT3P(DB_DNODE(db), ==, dn);
		DB_DNODE_EXIT(db);
#endif	/* DEBUG */

mutex_enter(&db->db_mtx);
		if (db->db_state != DB_EVICTING &&
		    zfs_refcount_is_zero(&db->db_holds)) {
			db_marker->db_level = db->db_level;
			db_marker->db_blkid = db->db_blkid;
			db_marker->db_state = DB_SEARCH;
			avl_insert_here(&dn->dn_dbufs, db_marker, db,
			    AVL_BEFORE);

/*
			 * We need to use the "marker" dbuf rather than
			 * simply getting the next dbuf, because
			 * dbuf_destroy() may actually remove multiple dbufs.
			 * It can call itself recursively on the parent dbuf,
			 * which may also be removed from dn_dbufs.  The code
			 * flow would look like:
			 *
			 * dbuf_destroy():
			 *   dnode_rele_and_unlock(parent_dbuf, evicting=TRUE):
			 *	if (!cacheable || pending_evict)
			 *	  dbuf_destroy()
			 */
			dbuf_destroy(db);

db_next = AVL_NEXT(&dn->dn_dbufs, db_marker);
			avl_remove(&dn->dn_dbufs, db_marker);
		} else {
			db->db_pending_evict = TRUE;
			mutex_exit(&db->db_mtx);
			db_next = AVL_NEXT(&dn->dn_dbufs, db);
		}
	}
	mutex_exit(&dn->dn_dbufs_mtx);

kmem_free(db_marker, sizeof (dmu_buf_impl_t));

dnode_evict_bonus(dn);
}

void
dnode_evict_bonus(dnode_t *dn)
{
	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
	if (dn->dn_bonus != NULL) {
		if (zfs_refcount_is_zero(&dn->dn_bonus->db_holds)) {
			mutex_enter(&dn->dn_bonus->db_mtx);
			dbuf_destroy(dn->dn_bonus);
			dn->dn_bonus = NULL;
		} else {
			dn->dn_bonus->db_pending_evict = TRUE;
		}
	}
	rw_exit(&dn->dn_struct_rwlock);
}

static void
dnode_undirty_dbufs(list_t *list)
{
	dbuf_dirty_record_t *dr;

while ((dr = list_head(list))) {
		dmu_buf_impl_t *db = dr->dr_dbuf;
		uint64_t txg = dr->dr_txg;

if (db->db_level != 0)
			dnode_undirty_dbufs(&dr->dt.di.dr_children);

mutex_enter(&db->db_mtx);
		/* XXX - use dbuf_undirty()? */
		list_remove(list, dr);
		ASSERT(list_head(&db->db_dirty_records) == dr);
		list_remove_head(&db->db_dirty_records);
		ASSERT(list_is_empty(&db->db_dirty_records));
		db->db_dirtycnt -= 1;
		if (db->db_level == 0) {
			ASSERT(db->db_blkid == DMU_BONUS_BLKID ||
			    dr->dt.dl.dr_data == db->db_buf);
			dbuf_unoverride(dr);
		} else {
			mutex_destroy(&dr->dt.di.dr_mtx);
			list_destroy(&dr->dt.di.dr_children);
		}
		kmem_free(dr, sizeof (dbuf_dirty_record_t));
		dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg, B_FALSE);
	}
}

static void
dnode_sync_free(dnode_t *dn, dmu_tx_t *tx)
{
	int txgoff = tx->tx_txg & TXG_MASK;

ASSERT(dmu_tx_is_syncing(tx));

/*
	 * Our contents should have been freed in dnode_sync() by the
	 * free range record inserted by the caller of dnode_free().
	 */
	ASSERT0(DN_USED_BYTES(dn->dn_phys));
	ASSERT(BP_IS_HOLE(dn->dn_phys->dn_blkptr));

dnode_undirty_dbufs(&dn->dn_dirty_records[txgoff]);
	dnode_evict_dbufs(dn);

/*
	 * XXX - It would be nice to assert this, but we may still
	 * have residual holds from async evictions from the arc...
	 *
	 * zfs_obj_to_path() also depends on this being
	 * commented out.
	 *
	 * ASSERT3U(zfs_refcount_count(&dn->dn_holds), ==, 1);
	 */

/* Undirty next bits */
	dn->dn_next_nlevels[txgoff] = 0;
	dn->dn_next_indblkshift[txgoff] = 0;
	dn->dn_next_blksz[txgoff] = 0;
	dn->dn_next_maxblkid[txgoff] = 0;

/* ASSERT(blkptrs are zero); */
	ASSERT(dn->dn_phys->dn_type != DMU_OT_NONE);
	ASSERT(dn->dn_type != DMU_OT_NONE);

ASSERT(dn->dn_free_txg > 0);
	if (dn->dn_allocated_txg != dn->dn_free_txg)
		dmu_buf_will_dirty(&dn->dn_dbuf->db, tx);
	bzero(dn->dn_phys, sizeof (dnode_phys_t) * dn->dn_num_slots);
	dnode_free_interior_slots(dn);

mutex_enter(&dn->dn_mtx);
	dn->dn_type = DMU_OT_NONE;
	dn->dn_maxblkid = 0;
	dn->dn_allocated_txg = 0;
	dn->dn_free_txg = 0;
	dn->dn_have_spill = B_FALSE;
	dn->dn_num_slots = 1;
	mutex_exit(&dn->dn_mtx);

ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);

dnode_rele(dn, (void *)(uintptr_t)tx->tx_txg);
	/*
	 * Now that we've released our hold, the dnode may
	 * be evicted, so we mustn't access it.
	 */
}

/*
 * Write out the dnode's dirty buffers.
 */
void
dnode_sync(dnode_t *dn, dmu_tx_t *tx)
{
	objset_t *os = dn->dn_objset;
	dnode_phys_t *dnp = dn->dn_phys;
	int txgoff = tx->tx_txg & TXG_MASK;
	list_t *list = &dn->dn_dirty_records[txgoff];
	static const dnode_phys_t zerodn __maybe_unused = { 0 };
	boolean_t kill_spill = B_FALSE;

ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(dnp->dn_type != DMU_OT_NONE || dn->dn_allocated_txg);
	ASSERT(dnp->dn_type != DMU_OT_NONE ||
	    bcmp(dnp, &zerodn, DNODE_MIN_SIZE) == 0);
	DNODE_VERIFY(dn);

ASSERT(dn->dn_dbuf == NULL || arc_released(dn->dn_dbuf->db_buf));

/*
	 * Do user accounting if it is enabled and this is not
	 * an encrypted receive.
	 */
	if (dmu_objset_userused_enabled(os) &&
	    !DMU_OBJECT_IS_SPECIAL(dn->dn_object) &&
	    (!os->os_encrypted || !dmu_objset_is_receiving(os))) {
		mutex_enter(&dn->dn_mtx);
		dn->dn_oldused = DN_USED_BYTES(dn->dn_phys);
		dn->dn_oldflags = dn->dn_phys->dn_flags;
		dn->dn_phys->dn_flags |= DNODE_FLAG_USERUSED_ACCOUNTED;
		if (dmu_objset_userobjused_enabled(dn->dn_objset))
			dn->dn_phys->dn_flags |=
			    DNODE_FLAG_USEROBJUSED_ACCOUNTED;
		mutex_exit(&dn->dn_mtx);
		dmu_objset_userquota_get_ids(dn, B_FALSE, tx);
	} else {
		/* Once we account for it, we should always account for it */
		ASSERT(!(dn->dn_phys->dn_flags &
		    DNODE_FLAG_USERUSED_ACCOUNTED));
		ASSERT(!(dn->dn_phys->dn_flags &
		    DNODE_FLAG_USEROBJUSED_ACCOUNTED));
	}

mutex_enter(&dn->dn_mtx);
	if (dn->dn_allocated_txg == tx->tx_txg) {
		/* The dnode is newly allocated or reallocated */
		if (dnp->dn_type == DMU_OT_NONE) {
			/* this is a first alloc, not a realloc */
			dnp->dn_nlevels = 1;
			dnp->dn_nblkptr = dn->dn_nblkptr;
		}

dnp->dn_type = dn->dn_type;
		dnp->dn_bonustype = dn->dn_bonustype;
		dnp->dn_bonuslen = dn->dn_bonuslen;
	}

dnp->dn_extra_slots = dn->dn_num_slots - 1;

ASSERT(dnp->dn_nlevels > 1 ||
	    BP_IS_HOLE(&dnp->dn_blkptr[0]) ||
	    BP_IS_EMBEDDED(&dnp->dn_blkptr[0]) ||
	    BP_GET_LSIZE(&dnp->dn_blkptr[0]) ==
	    dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
	ASSERT(dnp->dn_nlevels < 2 ||
	    BP_IS_HOLE(&dnp->dn_blkptr[0]) ||
	    BP_GET_LSIZE(&dnp->dn_blkptr[0]) == 1 << dnp->dn_indblkshift);

if (dn->dn_next_type[txgoff] != 0) {
		dnp->dn_type = dn->dn_type;
		dn->dn_next_type[txgoff] = 0;
	}

if (dn->dn_next_blksz[txgoff] != 0) {
		ASSERT(P2PHASE(dn->dn_next_blksz[txgoff],
		    SPA_MINBLOCKSIZE) == 0);
		ASSERT(BP_IS_HOLE(&dnp->dn_blkptr[0]) ||
		    dn->dn_maxblkid == 0 || list_head(list) != NULL ||
		    dn->dn_next_blksz[txgoff] >> SPA_MINBLOCKSHIFT ==
		    dnp->dn_datablkszsec ||
		    !range_tree_is_empty(dn->dn_free_ranges[txgoff]));
		dnp->dn_datablkszsec =
		    dn->dn_next_blksz[txgoff] >> SPA_MINBLOCKSHIFT;
		dn->dn_next_blksz[txgoff] = 0;
	}

if (dn->dn_next_bonuslen[txgoff] != 0) {
		if (dn->dn_next_bonuslen[txgoff] == DN_ZERO_BONUSLEN)
			dnp->dn_bonuslen = 0;
		else
			dnp->dn_bonuslen = dn->dn_next_bonuslen[txgoff];
		ASSERT(dnp->dn_bonuslen <=
		    DN_SLOTS_TO_BONUSLEN(dnp->dn_extra_slots + 1));
		dn->dn_next_bonuslen[txgoff] = 0;
	}

if (dn->dn_next_bonustype[txgoff] != 0) {
		ASSERT(DMU_OT_IS_VALID(dn->dn_next_bonustype[txgoff]));
		dnp->dn_bonustype = dn->dn_next_bonustype[txgoff];
		dn->dn_next_bonustype[txgoff] = 0;
	}

boolean_t freeing_dnode = dn->dn_free_txg > 0 &&
	    dn->dn_free_txg <= tx->tx_txg;

/*
	 * Remove the spill block if we have been explicitly asked to
	 * remove it, or if the object is being removed.
	 */
	if (dn->dn_rm_spillblk[txgoff] || freeing_dnode) {
		if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)
			kill_spill = B_TRUE;
		dn->dn_rm_spillblk[txgoff] = 0;
	}

if (dn->dn_next_indblkshift[txgoff] != 0) {
		ASSERT(dnp->dn_nlevels == 1);
		dnp->dn_indblkshift = dn->dn_next_indblkshift[txgoff];
		dn->dn_next_indblkshift[txgoff] = 0;
	}

/*
	 * Just take the live (open-context) values for checksum and compress.
	 * Strictly speaking it's a future leak, but nothing bad happens if we
	 * start using the new checksum or compress algorithm a little early.
	 */
	dnp->dn_checksum = dn->dn_checksum;
	dnp->dn_compress = dn->dn_compress;

mutex_exit(&dn->dn_mtx);

if (kill_spill) {
		free_blocks(dn, DN_SPILL_BLKPTR(dn->dn_phys), 1, tx);
		mutex_enter(&dn->dn_mtx);
		dnp->dn_flags &= ~DNODE_FLAG_SPILL_BLKPTR;
		mutex_exit(&dn->dn_mtx);
	}

/* process all the "freed" ranges in the file */
	if (dn->dn_free_ranges[txgoff] != NULL) {
		dnode_sync_free_range_arg_t dsfra;
		dsfra.dsfra_dnode = dn;
		dsfra.dsfra_tx = tx;
		dsfra.dsfra_free_indirects = freeing_dnode;
		mutex_enter(&dn->dn_mtx);
		if (freeing_dnode) {
			ASSERT(range_tree_contains(dn->dn_free_ranges[txgoff],
			    0, dn->dn_maxblkid + 1));
		}
		/*
		 * Because dnode_sync_free_range() must drop dn_mtx during its
		 * processing, using it as a callback to range_tree_vacate() is
		 * not safe.  No other operations (besides destroy) are allowed
		 * once range_tree_vacate() has begun, and dropping dn_mtx
		 * would leave a window open for another thread to observe that
		 * invalid (and unsafe) state.
		 */
		range_tree_walk(dn->dn_free_ranges[txgoff],
		    dnode_sync_free_range, &dsfra);
		range_tree_vacate(dn->dn_free_ranges[txgoff], NULL, NULL);
		range_tree_destroy(dn->dn_free_ranges[txgoff]);
		dn->dn_free_ranges[txgoff] = NULL;
		mutex_exit(&dn->dn_mtx);
	}

if (freeing_dnode) {
		dn->dn_objset->os_freed_dnodes++;
		dnode_sync_free(dn, tx);
		return;
	}

if (dn->dn_num_slots > DNODE_MIN_SLOTS) {
		dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset;
		mutex_enter(&ds->ds_lock);
		ds->ds_feature_activation[SPA_FEATURE_LARGE_DNODE] =
		    (void *)B_TRUE;
		mutex_exit(&ds->ds_lock);
	}

if (dn->dn_next_nlevels[txgoff]) {
		dnode_increase_indirection(dn, tx);
		dn->dn_next_nlevels[txgoff] = 0;
	}

/*
	 * This must be done after dnode_sync_free_range()
	 * and dnode_increase_indirection(). See dnode_new_blkid()
	 * for an explanation of the high bit being set.
	 */
	if (dn->dn_next_maxblkid[txgoff]) {
		mutex_enter(&dn->dn_mtx);
		dnp->dn_maxblkid =
		    dn->dn_next_maxblkid[txgoff] & ~DMU_NEXT_MAXBLKID_SET;
		dn->dn_next_maxblkid[txgoff] = 0;
		mutex_exit(&dn->dn_mtx);
	}

if (dn->dn_next_nblkptr[txgoff]) {
		/* this should only happen on a realloc */
		ASSERT(dn->dn_allocated_txg == tx->tx_txg);
		if (dn->dn_next_nblkptr[txgoff] > dnp->dn_nblkptr) {
			/* zero the new blkptrs we are gaining */
			bzero(dnp->dn_blkptr + dnp->dn_nblkptr,
			    sizeof (blkptr_t) *
			    (dn->dn_next_nblkptr[txgoff] - dnp->dn_nblkptr));
#ifdef ZFS_DEBUG
		} else {
			int i;
			ASSERT(dn->dn_next_nblkptr[txgoff] < dnp->dn_nblkptr);
			/* the blkptrs we are losing better be unallocated */
			for (i = 0; i < dnp->dn_nblkptr; i++) {
				if (i >= dn->dn_next_nblkptr[txgoff])
					ASSERT(BP_IS_HOLE(&dnp->dn_blkptr[i]));
			}
#endif
		}
		mutex_enter(&dn->dn_mtx);
		dnp->dn_nblkptr = dn->dn_next_nblkptr[txgoff];
		dn->dn_next_nblkptr[txgoff] = 0;
		mutex_exit(&dn->dn_mtx);
	}

dbuf_sync_list(list, dn->dn_phys->dn_nlevels - 1, tx);

if (!DMU_OBJECT_IS_SPECIAL(dn->dn_object)) {
		ASSERT3P(list_head(list), ==, NULL);
		dnode_rele(dn, (void *)(uintptr_t)tx->tx_txg);
	}

/*
	 * Although we have dropped our reference to the dnode, it
	 * can't be evicted until its written, and we haven't yet
	 * initiated the IO for the dnode's dbuf.  Additionally, the caller
	 * has already added a reference to the dnode because it's on the
	 * os_synced_dnodes list.
	 */
}

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