dmu_tx.c revision 8f38d41910063e19709864b025684a228961299f
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The contents of this file are subject to the terms of the
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens * Common Development and Distribution License (the "License").
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens * You may not use this file except in compliance with the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
fa9e4066f08beec538e775443c5be79dd423fcabahrens * or http://www.opensolaris.org/os/licensing.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * See the License for the specific language governing permissions
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and limitations under the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * When distributing Covered Code, include this CDDL HEADER in each
fa9e4066f08beec538e775443c5be79dd423fcabahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If applicable, add the following below this CDDL HEADER, with the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * fields enclosed by brackets "[]" replaced with your own identifying
fa9e4066f08beec538e775443c5be79dd423fcabahrens * information: Portions Copyright [yyyy] [name of copyright owner]
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER END
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
8f38d41910063e19709864b025684a228961299fek * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Use is subject to license terms.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#pragma ident "%Z%%M% %I% %E% SMI"
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu_impl.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dbuf.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu_tx.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu_objset.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dsl_dataset.h> /* for dsl_dataset_block_freeable() */
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dsl_dir.h> /* for dsl_dir_tempreserve_*() */
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dsl_pool.h>
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#include <sys/zap_impl.h> /* for fzap_default_block_shift */
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/spa.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zfs_context.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrocktypedef void (*dmu_tx_hold_func_t)(dmu_tx_t *tx, struct dnode *dn,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock uint64_t arg1, uint64_t arg2);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_t *
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrensdmu_tx_create_dd(dsl_dir_t *dd)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_t *tx = kmem_zalloc(sizeof (dmu_tx_t), KM_SLEEP);
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_dir = dd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dd)
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_pool = dd->dd_pool;
fa9e4066f08beec538e775443c5be79dd423fcabahrens list_create(&tx->tx_holds, sizeof (dmu_tx_hold_t),
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens offsetof(dmu_tx_hold_t, txh_node));
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#ifdef ZFS_DEBUG
fa9e4066f08beec538e775443c5be79dd423fcabahrens refcount_create(&tx->tx_space_written);
fa9e4066f08beec538e775443c5be79dd423fcabahrens refcount_create(&tx->tx_space_freed);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_t *
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_create(objset_t *os)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens dmu_tx_t *tx = dmu_tx_create_dd(os->os->os_dsl_dataset->ds_dir);
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_objset = os;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock tx->tx_lastsnap_txg = dsl_dataset_prev_snap_txg(os->os->os_dsl_dataset);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_t *
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens dmu_tx_t *tx = dmu_tx_create_dd(NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(txg, <=, dp->dp_tx.tx_open_txg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_pool = dp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_txg = txg;
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_anyobj = TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_is_syncing(dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (tx->tx_anyobj);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_private_ok(dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return (tx->tx_anyobj);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensstatic dmu_tx_hold_t *
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_hold_object_impl(dmu_tx_t *tx, objset_t *os, uint64_t object,
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens enum dmu_tx_hold_type type, uint64_t arg1, uint64_t arg2)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dnode_t *dn = NULL;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (object != DMU_NEW_OBJECT) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dnode_hold(os->os, object, tx, &dn);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (err) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock tx->tx_err = err;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens return (NULL);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (err == 0 && tx->tx_txg != 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&dn->dn_mtx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * dn->dn_assigned_txg == tx->tx_txg doesn't pose a
fa9e4066f08beec538e775443c5be79dd423fcabahrens * problem, but there's no way for it to happen (for
fa9e4066f08beec538e775443c5be79dd423fcabahrens * now, at least).
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(dn->dn_assigned_txg == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens dn->dn_assigned_txg = tx->tx_txg;
fa9e4066f08beec538e775443c5be79dd423fcabahrens (void) refcount_add(&dn->dn_tx_holds, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&dn->dn_mtx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh = kmem_zalloc(sizeof (dmu_tx_hold_t), KM_SLEEP);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_tx = tx;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_dnode = dn;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#ifdef ZFS_DEBUG
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_type = type;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_arg1 = arg1;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_arg2 = arg2;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#endif
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens list_insert_tail(&tx->tx_holds, txh);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens return (txh);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_add_new_object(dmu_tx_t *tx, objset_t *os, uint64_t object)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If we're syncing, they can manipulate any object anyhow, and
fa9e4066f08beec538e775443c5be79dd423fcabahrens * the hold on the dnode_t can cause problems.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (!dmu_tx_is_syncing(tx)) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens (void) dmu_tx_hold_object_impl(tx, os,
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens object, THT_NEWOBJECT, 0, 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrockstatic int
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrockdmu_tx_check_ioerr(zio_t *zio, dnode_t *dn, int level, uint64_t blkid)
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock{
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock int err;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock dmu_buf_impl_t *db;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock rw_enter(&dn->dn_struct_rwlock, RW_READER);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock db = dbuf_hold_level(dn, level, blkid, FTAG);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock rw_exit(&dn->dn_struct_rwlock);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (db == NULL)
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return (EIO);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dbuf_read(db, zio, DB_RF_CANFAIL);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock dbuf_rele(db, FTAG);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return (err);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock}
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
fa9e4066f08beec538e775443c5be79dd423fcabahrens/* ARGSUSED */
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensdmu_tx_count_write(dmu_tx_hold_t *txh, uint64_t off, uint64_t len)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *dn = txh->txh_dnode;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens uint64_t start, end, i;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int min_bs, max_bs, min_ibs, max_ibs, epbs, bits;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens int err = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (len == 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens min_bs = SPA_MINBLOCKSHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens max_bs = SPA_MAXBLOCKSHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens min_ibs = DN_MIN_INDBLKSHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens max_ibs = DN_MAX_INDBLKSHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock /*
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * For i/o error checking, read the first and last level-0
99653d4ee642c6528e88224f12409a5f23060994eschrock * blocks (if they are not aligned), and all the level-1 blocks.
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (dn) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (dn->dn_maxblkid == 0) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_tx_check_ioerr(NULL, dn, 0, 0);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (err)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens goto out;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock } else {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens zio_t *zio = zio_root(dn->dn_objset->os_spa,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock NULL, NULL, ZIO_FLAG_CANFAIL);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock /* first level-0 block */
99653d4ee642c6528e88224f12409a5f23060994eschrock start = off >> dn->dn_datablkshift;
99653d4ee642c6528e88224f12409a5f23060994eschrock if (P2PHASE(off, dn->dn_datablksz) ||
99653d4ee642c6528e88224f12409a5f23060994eschrock len < dn->dn_datablksz) {
99653d4ee642c6528e88224f12409a5f23060994eschrock err = dmu_tx_check_ioerr(zio, dn, 0, start);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (err)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens goto out;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock /* last level-0 block */
99653d4ee642c6528e88224f12409a5f23060994eschrock end = (off+len-1) >> dn->dn_datablkshift;
99653d4ee642c6528e88224f12409a5f23060994eschrock if (end != start &&
99653d4ee642c6528e88224f12409a5f23060994eschrock P2PHASE(off+len, dn->dn_datablksz)) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_tx_check_ioerr(zio, dn, 0, end);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (err)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens goto out;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock /* level-1 blocks */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (dn->dn_nlevels > 1) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock start >>= dn->dn_indblkshift - SPA_BLKPTRSHIFT;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock end >>= dn->dn_indblkshift - SPA_BLKPTRSHIFT;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock for (i = start+1; i < end; i++) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_tx_check_ioerr(zio, dn, 1, i);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (err)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens goto out;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = zio_wait(zio);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (err)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens goto out;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If there's more than one block, the blocksize can't change,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * so we can make a more precise estimate. Alternatively,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * if the dnode's ibs is larger than max_ibs, always use that.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * This ensures that if we reduce DN_MAX_INDBLKSHIFT,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * the code will still work correctly on existing pools.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dn && (dn->dn_maxblkid != 0 || dn->dn_indblkshift > max_ibs)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens min_ibs = max_ibs = dn->dn_indblkshift;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dn->dn_datablkshift != 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens min_bs = max_bs = dn->dn_datablkshift;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * 'end' is the last thing we will access, not one past.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * This way we won't overflow when accessing the last byte.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens start = P2ALIGN(off, 1ULL << max_bs);
fa9e4066f08beec538e775443c5be79dd423fcabahrens end = P2ROUNDUP(off + len, 1ULL << max_bs) - 1;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_space_towrite += end - start + 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens start >>= min_bs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens end >>= min_bs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens epbs = min_ibs - SPA_BLKPTRSHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The object contains at most 2^(64 - min_bs) blocks,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and each indirect level maps 2^epbs.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (bits = 64 - min_bs; bits >= 0; bits -= epbs) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens start >>= epbs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens end >>= epbs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If we increase the number of levels of indirection,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * we'll need new blkid=0 indirect blocks. If start == 0,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * we're already accounting for that blocks; and if end == 0,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * we can't increase the number of levels beyond that.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (start != 0 && end != 0)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_space_towrite += 1ULL << max_ibs;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_space_towrite += (end - start + 1) << max_ibs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ASSERT(txh->txh_space_towrite < 2 * DMU_MAX_ACCESS);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensout:
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (err)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_tx->tx_err = err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensdmu_tx_count_dnode(dmu_tx_hold_t *txh)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *dn = txh->txh_dnode;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *mdn = txh->txh_tx->tx_objset->os->os_meta_dnode;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens uint64_t space = mdn->dn_datablksz +
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ((mdn->dn_nlevels-1) << mdn->dn_indblkshift);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dn && dn->dn_dbuf->db_blkptr &&
fa9e4066f08beec538e775443c5be79dd423fcabahrens dsl_dataset_block_freeable(dn->dn_objset->os_dsl_dataset,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock dn->dn_dbuf->db_blkptr->blk_birth)) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_space_tooverwrite += space;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens } else {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_space_towrite += space;
a9799022bd90b13722204e80112efaa5bf573099ck if (dn && dn->dn_dbuf->db_blkptr)
a9799022bd90b13722204e80112efaa5bf573099ck txh->txh_space_tounref += space;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(tx->tx_txg == 0);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock ASSERT(len < DMU_MAX_ACCESS);
dd6ef5383c0b29543894f993c2ab3ab8ab6e6f20maybee ASSERT(len == 0 || UINT64_MAX - off >= len - 1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh = dmu_tx_hold_object_impl(tx, tx->tx_objset,
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens object, THT_WRITE, off, len);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (txh == NULL)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens return;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_count_write(txh, off, len);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_count_dnode(txh);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensdmu_tx_count_free(dmu_tx_hold_t *txh, uint64_t off, uint64_t len)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t blkid, nblks;
a9799022bd90b13722204e80112efaa5bf573099ck uint64_t space = 0, unref = 0;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *dn = txh->txh_dnode;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens spa_t *spa = txh->txh_tx->tx_pool->dp_spa;
347a31bcb38b51837caee115d3979d3a981cc099ahrens int dirty;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
c543ec060d1359f6c8a9507242521f344a2ac3efahrens /*
347a31bcb38b51837caee115d3979d3a981cc099ahrens * We don't need to use any locking to check for dirtyness
347a31bcb38b51837caee115d3979d3a981cc099ahrens * because it's OK if we get stale data -- the dnode may become
31fd60d36d9ae794bbedd5e834b8be6d412a853fahrens * dirty immediately after our check anyway. This is just a
31fd60d36d9ae794bbedd5e834b8be6d412a853fahrens * means to avoid the expensive count when we aren't sure we
347a31bcb38b51837caee115d3979d3a981cc099ahrens * need it. We need to be able to deal with a dirty dnode.
c543ec060d1359f6c8a9507242521f344a2ac3efahrens */
347a31bcb38b51837caee115d3979d3a981cc099ahrens dirty = list_link_active(&dn->dn_dirty_link[0]) |
c543ec060d1359f6c8a9507242521f344a2ac3efahrens list_link_active(&dn->dn_dirty_link[1]) |
c543ec060d1359f6c8a9507242521f344a2ac3efahrens list_link_active(&dn->dn_dirty_link[2]) |
347a31bcb38b51837caee115d3979d3a981cc099ahrens list_link_active(&dn->dn_dirty_link[3]);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (dirty || dn->dn_assigned_txg || dn->dn_phys->dn_nlevels == 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
c543ec060d1359f6c8a9507242521f344a2ac3efahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
c543ec060d1359f6c8a9507242521f344a2ac3efahrens * the struct_rwlock protects us against dn_phys->dn_nlevels
c543ec060d1359f6c8a9507242521f344a2ac3efahrens * changing, in case (against all odds) we manage to dirty &
c543ec060d1359f6c8a9507242521f344a2ac3efahrens * sync out the changes after we check for being dirty.
c543ec060d1359f6c8a9507242521f344a2ac3efahrens * also, dbuf_hold_impl() wants us to have the struct_rwlock.
c543ec060d1359f6c8a9507242521f344a2ac3efahrens *
c543ec060d1359f6c8a9507242521f344a2ac3efahrens * It's fine to use dn_datablkshift rather than the dn_phys
c543ec060d1359f6c8a9507242521f344a2ac3efahrens * equivalent because if it is changing, maxblkid==0 and we will
c543ec060d1359f6c8a9507242521f344a2ac3efahrens * bail.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_enter(&dn->dn_struct_rwlock, RW_READER);
c543ec060d1359f6c8a9507242521f344a2ac3efahrens if (dn->dn_phys->dn_maxblkid == 0) {
c543ec060d1359f6c8a9507242521f344a2ac3efahrens if (off == 0 && len >= dn->dn_datablksz) {
c543ec060d1359f6c8a9507242521f344a2ac3efahrens blkid = 0;
c543ec060d1359f6c8a9507242521f344a2ac3efahrens nblks = 1;
c543ec060d1359f6c8a9507242521f344a2ac3efahrens } else {
c543ec060d1359f6c8a9507242521f344a2ac3efahrens rw_exit(&dn->dn_struct_rwlock);
c543ec060d1359f6c8a9507242521f344a2ac3efahrens return;
c543ec060d1359f6c8a9507242521f344a2ac3efahrens }
c543ec060d1359f6c8a9507242521f344a2ac3efahrens } else {
c543ec060d1359f6c8a9507242521f344a2ac3efahrens blkid = off >> dn->dn_datablkshift;
c543ec060d1359f6c8a9507242521f344a2ac3efahrens nblks = (off + len) >> dn->dn_datablkshift;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
c543ec060d1359f6c8a9507242521f344a2ac3efahrens if (blkid >= dn->dn_phys->dn_maxblkid) {
c543ec060d1359f6c8a9507242521f344a2ac3efahrens rw_exit(&dn->dn_struct_rwlock);
c543ec060d1359f6c8a9507242521f344a2ac3efahrens return;
c543ec060d1359f6c8a9507242521f344a2ac3efahrens }
c543ec060d1359f6c8a9507242521f344a2ac3efahrens if (blkid + nblks > dn->dn_phys->dn_maxblkid)
c543ec060d1359f6c8a9507242521f344a2ac3efahrens nblks = dn->dn_phys->dn_maxblkid - blkid;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
c543ec060d1359f6c8a9507242521f344a2ac3efahrens /* don't bother after 128,000 blocks */
c543ec060d1359f6c8a9507242521f344a2ac3efahrens nblks = MIN(nblks, 128*1024);
c543ec060d1359f6c8a9507242521f344a2ac3efahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dn->dn_phys->dn_nlevels == 1) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens int i;
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (i = 0; i < nblks; i++) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens blkptr_t *bp = dn->dn_phys->dn_blkptr;
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(blkid + i, <, dn->dn_phys->dn_nblkptr);
fa9e4066f08beec538e775443c5be79dd423fcabahrens bp += blkid + i;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (dsl_dataset_block_freeable(ds, bp->blk_birth)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf_bp(bp, "can free old%s", "");
99653d4ee642c6528e88224f12409a5f23060994eschrock space += bp_get_dasize(spa, bp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
a9799022bd90b13722204e80112efaa5bf573099ck unref += BP_GET_ASIZE(bp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock nblks = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens while (nblks) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_buf_impl_t *dbuf;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err, epbs, blkoff, tochk;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens blkoff = P2PHASE(blkid, 1<<epbs);
fa9e4066f08beec538e775443c5be79dd423fcabahrens tochk = MIN((1<<epbs) - blkoff, nblks);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = dbuf_hold_impl(dn, 1, blkid >> epbs, TRUE, FTAG, &dbuf);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens int i;
fa9e4066f08beec538e775443c5be79dd423fcabahrens blkptr_t *bp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dbuf_read(dbuf, NULL,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock DB_RF_HAVESTRUCT | DB_RF_CANFAIL);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (err != 0) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_tx->tx_err = err;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock dbuf_rele(dbuf, FTAG);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock break;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens bp = dbuf->db.db_data;
fa9e4066f08beec538e775443c5be79dd423fcabahrens bp += blkoff;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (i = 0; i < tochk; i++) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dsl_dataset_block_freeable(ds,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock bp[i].blk_birth)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf_bp(&bp[i],
fa9e4066f08beec538e775443c5be79dd423fcabahrens "can free old%s", "");
99653d4ee642c6528e88224f12409a5f23060994eschrock space += bp_get_dasize(spa, &bp[i]);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
a9799022bd90b13722204e80112efaa5bf573099ck unref += BP_GET_ASIZE(bp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock dbuf_rele(dbuf, FTAG);
c543ec060d1359f6c8a9507242521f344a2ac3efahrens }
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (err && err != ENOENT) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_tx->tx_err = err;
c543ec060d1359f6c8a9507242521f344a2ac3efahrens break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens blkid += tochk;
fa9e4066f08beec538e775443c5be79dd423fcabahrens nblks -= tochk;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_exit(&dn->dn_struct_rwlock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_space_tofree += space;
a9799022bd90b13722204e80112efaa5bf573099ck txh->txh_space_tounref += unref;
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensvoid
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensdmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off, uint64_t len)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *dn;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock uint64_t start, end, i;
c543ec060d1359f6c8a9507242521f344a2ac3efahrens int err, shift;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock zio_t *zio;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ASSERT(tx->tx_txg == 0);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh = dmu_tx_hold_object_impl(tx, tx->tx_objset,
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens object, THT_FREE, off, len);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (txh == NULL)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens return;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dn = txh->txh_dnode;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* first block */
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens if (off != 0)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_count_write(txh, off, 1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* last block */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (len != DMU_OBJECT_END)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_count_write(txh, off+len, 1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (off >= (dn->dn_maxblkid+1) * dn->dn_datablksz)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (len == DMU_OBJECT_END)
fa9e4066f08beec538e775443c5be79dd423fcabahrens len = (dn->dn_maxblkid+1) * dn->dn_datablksz - off;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock /*
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * For i/o error checking, read the first and last level-0
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * blocks, and all the level-1 blocks. The above count_write's
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * will take care of the level-0 blocks.
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock */
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens if (dn->dn_nlevels > 1) {
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens shift = dn->dn_datablkshift + dn->dn_indblkshift -
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens SPA_BLKPTRSHIFT;
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens start = off >> shift;
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens end = dn->dn_datablkshift ? ((off+len) >> shift) : 0;
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens zio = zio_root(tx->tx_pool->dp_spa,
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens NULL, NULL, ZIO_FLAG_CANFAIL);
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens for (i = start; i <= end; i++) {
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens uint64_t ibyte = i << shift;
6754306ec9a89fd28806908d10c76141e8fbba3fahrens err = dnode_next_offset(dn, FALSE, &ibyte, 2, 1, 0);
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens i = ibyte >> shift;
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens if (err == ESRCH)
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens break;
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens if (err) {
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens tx->tx_err = err;
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens return;
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens err = dmu_tx_check_ioerr(zio, dn, 1, i);
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens if (err) {
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens tx->tx_err = err;
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens return;
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens }
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens }
98572ac1e6b4d1bdba6ab2df94e0a0c37df56337ahrens err = zio_wait(zio);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (err) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock tx->tx_err = err;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_count_dnode(txh);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_count_free(txh, off, len);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensdmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, char *name)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *dn;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t nblocks;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock int epbs, err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ASSERT(tx->tx_txg == 0);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh = dmu_tx_hold_object_impl(tx, tx->tx_objset,
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens object, THT_ZAP, add, (uintptr_t)name);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (txh == NULL)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens return;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dn = txh->txh_dnode;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_count_dnode(txh);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dn == NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * We will be able to fit a new object's entries into one leaf
fa9e4066f08beec538e775443c5be79dd423fcabahrens * block. So there will be at most 2 blocks total,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * including the header block.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_count_write(txh, 0, 2 << fzap_default_block_shift);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3P(dmu_ot[dn->dn_type].ot_byteswap, ==, zap_byteswap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (dn->dn_maxblkid == 0 && !add) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If there is only one block (i.e. this is a micro-zap)
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * and we are not adding anything, the accounting is simple.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_tx_check_ioerr(NULL, dn, 0, 0);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (err) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock tx->tx_err = err;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
b6130ead041e56a0331b89b333bdddab8afb9b1cmaybee /*
b6130ead041e56a0331b89b333bdddab8afb9b1cmaybee * Use max block size here, since we don't know how much
b6130ead041e56a0331b89b333bdddab8afb9b1cmaybee * the size will change between now and the dbuf dirty call.
b6130ead041e56a0331b89b333bdddab8afb9b1cmaybee */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dsl_dataset_block_freeable(dn->dn_objset->os_dsl_dataset,
a9799022bd90b13722204e80112efaa5bf573099ck dn->dn_phys->dn_blkptr[0].blk_birth)) {
b6130ead041e56a0331b89b333bdddab8afb9b1cmaybee txh->txh_space_tooverwrite += SPA_MAXBLOCKSIZE;
a9799022bd90b13722204e80112efaa5bf573099ck } else {
b6130ead041e56a0331b89b333bdddab8afb9b1cmaybee txh->txh_space_towrite += SPA_MAXBLOCKSIZE;
a9799022bd90b13722204e80112efaa5bf573099ck txh->txh_space_tounref +=
a9799022bd90b13722204e80112efaa5bf573099ck BP_GET_ASIZE(dn->dn_phys->dn_blkptr);
a9799022bd90b13722204e80112efaa5bf573099ck }
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (dn->dn_maxblkid > 0 && name) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock /*
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * access the name in this fat-zap so that we'll check
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * for i/o errors to the leaf blocks, etc.
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = zap_lookup(&dn->dn_objset->os, dn->dn_object, name,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock 8, 0, NULL);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (err == EIO) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock tx->tx_err = err;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * 3 blocks overwritten: target leaf, ptrtbl block, header block
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * 3 new blocks written if adding: new split leaf, 2 grown ptrtbl blocks
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_count_write(txh, dn->dn_maxblkid * dn->dn_datablksz,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock (3 + add ? 3 : 0) << dn->dn_datablkshift);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If the modified blocks are scattered to the four winds,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * we'll have to modify an indirect twig for each.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (nblocks = dn->dn_maxblkid >> epbs; nblocks != 0; nblocks >>= epbs)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_space_towrite += 3 << dn->dn_indblkshift;
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ASSERT(tx->tx_txg == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh = dmu_tx_hold_object_impl(tx, tx->tx_objset,
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens object, THT_BONUS, 0, 0);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (txh)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_count_dnode(txh);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_hold_space(dmu_tx_t *tx, uint64_t space)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(tx->tx_txg == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh = dmu_tx_hold_object_impl(tx, tx->tx_objset,
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens DMU_NEW_OBJECT, THT_SPACE, space, 0);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_space_towrite += space;
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_holds(dmu_tx_t *tx, uint64_t object)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int holds = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * By asserting that the tx is assigned, we're counting the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * number of dn_tx_holds, which is the same as the number of
fa9e4066f08beec538e775443c5be79dd423fcabahrens * dn_holds. Otherwise, we'd be counting dn_holds, but
fa9e4066f08beec538e775443c5be79dd423fcabahrens * dn_tx_holds could be 0.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(tx->tx_txg != 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* if (tx->tx_anyobj == TRUE) */
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* return (0); */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens for (txh = list_head(&tx->tx_holds); txh;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh = list_next(&tx->tx_holds, txh)) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (txh->txh_dnode && txh->txh_dnode->dn_object == object)
fa9e4066f08beec538e775443c5be79dd423fcabahrens holds++;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (holds);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
9c9dc39aa72ac40bb2558d54adfa596d217135d9ek#ifdef ZFS_DEBUG
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_dirty_buf(dmu_tx_t *tx, dmu_buf_impl_t *db)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int match_object = FALSE, match_offset = FALSE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dnode_t *dn = db->db_dnode;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(tx->tx_txg != 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(tx->tx_objset == NULL || dn->dn_objset == tx->tx_objset->os);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(dn->dn_object, ==, db->db.db_object);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (tx->tx_anyobj)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* XXX No checking on the meta dnode for now */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (db->db.db_object == DMU_META_DNODE_OBJECT)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens for (txh = list_head(&tx->tx_holds); txh;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh = list_next(&tx->tx_holds, txh)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(dn == NULL || dn->dn_assigned_txg == tx->tx_txg);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (txh->txh_dnode == dn && txh->txh_type != THT_NEWOBJECT)
fa9e4066f08beec538e775443c5be79dd423fcabahrens match_object = TRUE;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (txh->txh_dnode == NULL || txh->txh_dnode == dn) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens int datablkshift = dn->dn_datablkshift ?
fa9e4066f08beec538e775443c5be79dd423fcabahrens dn->dn_datablkshift : SPA_MAXBLOCKSHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int shift = datablkshift + epbs * db->db_level;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t beginblk = shift >= 64 ? 0 :
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens (txh->txh_arg1 >> shift);
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t endblk = shift >= 64 ? 0 :
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ((txh->txh_arg1 + txh->txh_arg2 - 1) >> shift);
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t blkid = db->db_blkid;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens /* XXX txh_arg2 better not be zero... */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dprintf("found txh type %x beginblk=%llx endblk=%llx\n",
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_type, beginblk, endblk);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens switch (txh->txh_type) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens case THT_WRITE:
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (blkid >= beginblk && blkid <= endblk)
fa9e4066f08beec538e775443c5be79dd423fcabahrens match_offset = TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We will let this hold work for the bonus
fa9e4066f08beec538e775443c5be79dd423fcabahrens * buffer so that we don't need to hold it
fa9e4066f08beec538e775443c5be79dd423fcabahrens * when creating a new object.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (blkid == DB_BONUS_BLKID)
fa9e4066f08beec538e775443c5be79dd423fcabahrens match_offset = TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * They might have to increase nlevels,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * thus dirtying the new TLIBs. Or the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * might have to change the block size,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * thus dirying the new lvl=0 blk=0.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (blkid == 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens match_offset = TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens case THT_FREE:
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (blkid == beginblk &&
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens (txh->txh_arg1 != 0 ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens dn->dn_maxblkid == 0))
fa9e4066f08beec538e775443c5be79dd423fcabahrens match_offset = TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (blkid == endblk &&
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh->txh_arg2 != DMU_OBJECT_END)
fa9e4066f08beec538e775443c5be79dd423fcabahrens match_offset = TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens case THT_BONUS:
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (blkid == DB_BONUS_BLKID)
fa9e4066f08beec538e775443c5be79dd423fcabahrens match_offset = TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens case THT_ZAP:
fa9e4066f08beec538e775443c5be79dd423fcabahrens match_offset = TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens case THT_NEWOBJECT:
fa9e4066f08beec538e775443c5be79dd423fcabahrens match_object = TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens default:
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ASSERT(!"bad txh_type");
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (match_object && match_offset)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens panic("dirtying dbuf obj=%llx lvl=%u blkid=%llx but not tx_held\n",
fa9e4066f08beec538e775443c5be79dd423fcabahrens (u_longlong_t)db->db.db_object, db->db_level,
fa9e4066f08beec538e775443c5be79dd423fcabahrens (u_longlong_t)db->db_blkid);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
9c9dc39aa72ac40bb2558d54adfa596d217135d9ek#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic int
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensdmu_tx_try_assign(dmu_tx_t *tx, uint64_t txg_how)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
0a4e9518a44f226be6d39383330b5b1792d2f184gw spa_t *spa = tx->tx_pool->dp_spa;
a9799022bd90b13722204e80112efaa5bf573099ck uint64_t lsize, asize, fsize, usize;
a9799022bd90b13722204e80112efaa5bf573099ck uint64_t towrite, tofree, tooverwrite, tounref;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ASSERT3U(tx->tx_txg, ==, 0);
0a4e9518a44f226be6d39383330b5b1792d2f184gw
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (tx->tx_err)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens return (tx->tx_err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
0a4e9518a44f226be6d39383330b5b1792d2f184gw if (spa_state(spa) == POOL_STATE_IO_FAILURE) {
0a4e9518a44f226be6d39383330b5b1792d2f184gw /*
0a4e9518a44f226be6d39383330b5b1792d2f184gw * If the user has indicated a blocking failure mode
0a4e9518a44f226be6d39383330b5b1792d2f184gw * then return ERESTART which will block in dmu_tx_wait().
0a4e9518a44f226be6d39383330b5b1792d2f184gw * Otherwise, return EIO so that an error can get
0a4e9518a44f226be6d39383330b5b1792d2f184gw * propagated back to the VOP calls.
0a4e9518a44f226be6d39383330b5b1792d2f184gw *
0a4e9518a44f226be6d39383330b5b1792d2f184gw * Note that we always honor the txg_how flag regardless
0a4e9518a44f226be6d39383330b5b1792d2f184gw * of the failuremode setting.
0a4e9518a44f226be6d39383330b5b1792d2f184gw */
0a4e9518a44f226be6d39383330b5b1792d2f184gw if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_CONTINUE &&
0a4e9518a44f226be6d39383330b5b1792d2f184gw txg_how != TXG_WAIT)
0a4e9518a44f226be6d39383330b5b1792d2f184gw return (EIO);
0a4e9518a44f226be6d39383330b5b1792d2f184gw
0a4e9518a44f226be6d39383330b5b1792d2f184gw return (ERESTART);
0a4e9518a44f226be6d39383330b5b1792d2f184gw }
0a4e9518a44f226be6d39383330b5b1792d2f184gw
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_txg = txg_hold_open(tx->tx_pool, &tx->tx_txgh);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens tx->tx_needassign_txh = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens /*
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens * NB: No error returns are allowed after txg_hold_open, but
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens * before processing the dnode holds, due to the
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens * dmu_tx_unassign() logic.
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
a9799022bd90b13722204e80112efaa5bf573099ck towrite = tofree = tooverwrite = tounref = 0;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens for (txh = list_head(&tx->tx_holds); txh;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh = list_next(&tx->tx_holds, txh)) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *dn = txh->txh_dnode;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dn != NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&dn->dn_mtx);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (dn->dn_assigned_txg == tx->tx_txg - 1) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens mutex_exit(&dn->dn_mtx);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens tx->tx_needassign_txh = txh;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens return (ERESTART);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (dn->dn_assigned_txg == 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens dn->dn_assigned_txg = tx->tx_txg;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ASSERT3U(dn->dn_assigned_txg, ==, tx->tx_txg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens (void) refcount_add(&dn->dn_tx_holds, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&dn->dn_mtx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens towrite += txh->txh_space_towrite;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens tofree += txh->txh_space_tofree;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens tooverwrite += txh->txh_space_tooverwrite;
a9799022bd90b13722204e80112efaa5bf573099ck tounref += txh->txh_space_tounref;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock }
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens /*
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens * NB: This check must be after we've held the dnodes, so that
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens * the dmu_tx_unassign() logic will work properly
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens */
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (txg_how >= TXG_INITIAL && txg_how != tx->tx_txg)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens return (ERESTART);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock /*
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * If a snapshot has been taken since we made our estimates,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * assume that we won't be able to free or overwrite anything.
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (tx->tx_objset &&
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock dsl_dataset_prev_snap_txg(tx->tx_objset->os->os_dsl_dataset) >
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock tx->tx_lastsnap_txg) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens towrite += tooverwrite;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens tooverwrite = tofree = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Convert logical size to worst-case allocated size.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens fsize = spa_get_asize(tx->tx_pool->dp_spa, tooverwrite) + tofree;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens lsize = towrite + tooverwrite;
fa9e4066f08beec538e775443c5be79dd423fcabahrens asize = spa_get_asize(tx->tx_pool->dp_spa, lsize);
a9799022bd90b13722204e80112efaa5bf573099ck usize = spa_get_asize(tx->tx_pool->dp_spa, tounref);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#ifdef ZFS_DEBUG
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_space_towrite = asize;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens tx->tx_space_tofree = tofree;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens tx->tx_space_tooverwrite = tooverwrite;
a9799022bd90b13722204e80112efaa5bf573099ck tx->tx_space_tounref = tounref;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (tx->tx_dir && asize != 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err = dsl_dir_tempreserve_space(tx->tx_dir,
a9799022bd90b13722204e80112efaa5bf573099ck lsize, asize, fsize, usize, &tx->tx_tempreserve_cookie, tx);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (err)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensstatic void
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensdmu_tx_unassign(dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (tx->tx_txg == 0)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens txg_rele_to_quiesce(&tx->tx_txgh);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens for (txh = list_head(&tx->tx_holds); txh != tx->tx_needassign_txh;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txh = list_next(&tx->tx_holds, txh)) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *dn = txh->txh_dnode;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dn == NULL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens continue;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&dn->dn_mtx);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ASSERT3U(dn->dn_assigned_txg, ==, tx->tx_txg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (refcount_remove(&dn->dn_tx_holds, tx) == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dn->dn_assigned_txg = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens cv_broadcast(&dn->dn_notxholds);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&dn->dn_mtx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens txg_rele_to_sync(&tx->tx_txgh);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens tx->tx_lasttried_txg = tx->tx_txg;
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_txg = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Assign tx to a transaction group. txg_how can be one of:
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * (1) TXG_WAIT. If the current open txg is full, waits until there's
fa9e4066f08beec538e775443c5be79dd423fcabahrens * a new one. This should be used when you're not holding locks.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If will only fail if we're truly out of space (or over quota).
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * (2) TXG_NOWAIT. If we can't assign into the current open txg without
fa9e4066f08beec538e775443c5be79dd423fcabahrens * blocking, returns immediately with ERESTART. This should be used
fa9e4066f08beec538e775443c5be79dd423fcabahrens * whenever you're holding locks. On an ERESTART error, the caller
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens * should drop locks, do a dmu_tx_wait(tx), and try again.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * (3) A specific txg. Use this if you need to ensure that multiple
fa9e4066f08beec538e775443c5be79dd423fcabahrens * transactions all sync in the same txg. Like TXG_NOWAIT, it
fa9e4066f08beec538e775443c5be79dd423fcabahrens * returns ERESTART if it can't assign you into the requested txg.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(tx->tx_txg == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(txg_how != 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(!dsl_pool_sync_context(tx->tx_pool));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens while ((err = dmu_tx_try_assign(tx, txg_how)) != 0) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_unassign(tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err != ERESTART || txg_how != TXG_WAIT)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_wait(tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens txg_rele_to_quiesce(&tx->tx_txgh);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensvoid
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrensdmu_tx_wait(dmu_tx_t *tx)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens{
0a4e9518a44f226be6d39383330b5b1792d2f184gw spa_t *spa = tx->tx_pool->dp_spa;
0a4e9518a44f226be6d39383330b5b1792d2f184gw
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens ASSERT(tx->tx_txg == 0);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
0a4e9518a44f226be6d39383330b5b1792d2f184gw /*
0a4e9518a44f226be6d39383330b5b1792d2f184gw * It's possible that the pool has become active after this thread
0a4e9518a44f226be6d39383330b5b1792d2f184gw * has tried to obtain a tx. If that's the case then his
0a4e9518a44f226be6d39383330b5b1792d2f184gw * tx_lasttried_txg would not have been assigned.
0a4e9518a44f226be6d39383330b5b1792d2f184gw */
0a4e9518a44f226be6d39383330b5b1792d2f184gw if (spa_state(spa) == POOL_STATE_IO_FAILURE ||
0a4e9518a44f226be6d39383330b5b1792d2f184gw tx->tx_lasttried_txg == 0) {
0a4e9518a44f226be6d39383330b5b1792d2f184gw txg_wait_synced(tx->tx_pool, spa_last_synced_txg(spa) + 1);
0a4e9518a44f226be6d39383330b5b1792d2f184gw } else if (tx->tx_needassign_txh) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *dn = tx->tx_needassign_txh->txh_dnode;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens mutex_enter(&dn->dn_mtx);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens while (dn->dn_assigned_txg == tx->tx_lasttried_txg - 1)
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens cv_wait(&dn->dn_notxholds, &dn->dn_mtx);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens mutex_exit(&dn->dn_mtx);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens tx->tx_needassign_txh = NULL;
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens } else {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens txg_wait_open(tx->tx_pool, tx->tx_lasttried_txg + 1);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens }
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens}
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_willuse_space(dmu_tx_t *tx, int64_t delta)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#ifdef ZFS_DEBUG
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (tx->tx_dir == NULL || delta == 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (delta > 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(refcount_count(&tx->tx_space_written) + delta, <=,
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_space_towrite);
fa9e4066f08beec538e775443c5be79dd423fcabahrens (void) refcount_add_many(&tx->tx_space_written, delta, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens (void) refcount_add_many(&tx->tx_space_freed, -delta, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_commit(dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(tx->tx_txg != 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens while (txh = list_head(&tx->tx_holds)) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *dn = txh->txh_dnode;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens list_remove(&tx->tx_holds, txh);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens kmem_free(txh, sizeof (dmu_tx_hold_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dn == NULL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens continue;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&dn->dn_mtx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(dn->dn_assigned_txg, ==, tx->tx_txg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (refcount_remove(&dn->dn_tx_holds, tx) == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dn->dn_assigned_txg = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens cv_broadcast(&dn->dn_notxholds);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&dn->dn_mtx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens dnode_rele(dn, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens if (tx->tx_tempreserve_cookie)
fa9e4066f08beec538e775443c5be79dd423fcabahrens dsl_dir_tempreserve_clear(tx->tx_tempreserve_cookie, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (tx->tx_anyobj == FALSE)
fa9e4066f08beec538e775443c5be79dd423fcabahrens txg_rele_to_sync(&tx->tx_txgh);
8f38d41910063e19709864b025684a228961299fek list_destroy(&tx->tx_holds);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#ifdef ZFS_DEBUG
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf("towrite=%llu written=%llu tofree=%llu freed=%llu\n",
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_space_towrite, refcount_count(&tx->tx_space_written),
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx->tx_space_tofree, refcount_count(&tx->tx_space_freed));
fa9e4066f08beec538e775443c5be79dd423fcabahrens refcount_destroy_many(&tx->tx_space_written,
fa9e4066f08beec538e775443c5be79dd423fcabahrens refcount_count(&tx->tx_space_written));
fa9e4066f08beec538e775443c5be79dd423fcabahrens refcount_destroy_many(&tx->tx_space_freed,
fa9e4066f08beec538e775443c5be79dd423fcabahrens refcount_count(&tx->tx_space_freed));
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(tx, sizeof (dmu_tx_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_abort(dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dmu_tx_hold_t *txh;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(tx->tx_txg == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens while (txh = list_head(&tx->tx_holds)) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens dnode_t *dn = txh->txh_dnode;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens list_remove(&tx->tx_holds, txh);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens kmem_free(txh, sizeof (dmu_tx_hold_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dn != NULL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens dnode_rele(dn, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
8f38d41910063e19709864b025684a228961299fek list_destroy(&tx->tx_holds);
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens#ifdef ZFS_DEBUG
fa9e4066f08beec538e775443c5be79dd423fcabahrens refcount_destroy_many(&tx->tx_space_written,
fa9e4066f08beec538e775443c5be79dd423fcabahrens refcount_count(&tx->tx_space_written));
fa9e4066f08beec538e775443c5be79dd423fcabahrens refcount_destroy_many(&tx->tx_space_freed,
fa9e4066f08beec538e775443c5be79dd423fcabahrens refcount_count(&tx->tx_space_freed));
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(tx, sizeof (dmu_tx_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensuint64_t
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_tx_get_txg(dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(tx->tx_txg != 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (tx->tx_txg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}