fs/zfs/dmu_object.c

fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The contents of this file are subject to the terms of the
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * Common Development and Distribution License (the "License").
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * 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.
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fa9e4066f08beec538e775443c5be79dd423fcabahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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fa9e4066f08beec538e775443c5be79dd423fcabahrens * information: Portions Copyright [yyyy] [name of copyright owner]
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fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
06e0070d70ba2ee95f5aa2645423eb2cf1546788Mark Shellenbaum * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
286ef71398fb54b1d5007d6f45aa4320a9e0ede2Paul Dagnelie * Copyright (c) 2013, 2015 by Delphix. All rights reserved.
e77d42eaa49fe55bfae1e0e0065c6e99affc001bMatthew Ahrens * Copyright 2014 HybridCluster. All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu_objset.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu_tx.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dnode.h>
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens#include <sys/zap.h>
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens#include <sys/zfeature.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensuint64_t
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_object_alloc(objset_t *os, dmu_object_type_t ot, int blocksize,
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens    uint64_t object;
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass    uint64_t L1_dnode_count = DNODES_PER_BLOCK <<
744947dc83c634d985ed3ad79ac9c5e28d1865fdTom Erickson        (DMU_META_DNODE(os)->dn_indblkshift - SPA_BLKPTRSHIFT);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock    dnode_t *dn = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
503ad85c168c7992ccc310af845a581cff3c72b5Matthew Ahrens    mutex_enter(&os->os_obj_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    for (;;) {
503ad85c168c7992ccc310af845a581cff3c72b5Matthew Ahrens        object = os->os_obj_next;
fa9e4066f08beec538e775443c5be79dd423fcabahrens        /*
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass         * Each time we polish off a L1 bp worth of dnodes (2^12
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass         * objects), move to another L1 bp that's still reasonably
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass         * sparse (at most 1/4 full). Look from the beginning at most
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass         * once per txg, but after that keep looking from here.
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass         * os_scan_dnodes is set during txg sync if enough objects
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass         * have been freed since the previous rescan to justify
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass         * backfilling again. If we can't find a suitable block, just
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass         * keep going from here.
286ef71398fb54b1d5007d6f45aa4320a9e0ede2Paul Dagnelie         *
286ef71398fb54b1d5007d6f45aa4320a9e0ede2Paul Dagnelie         * Note that dmu_traverse depends on the behavior that we use
286ef71398fb54b1d5007d6f45aa4320a9e0ede2Paul Dagnelie         * multiple blocks of the dnode object before going back to
286ef71398fb54b1d5007d6f45aa4320a9e0ede2Paul Dagnelie         * reuse objects.  Any change to this algorithm should preserve
286ef71398fb54b1d5007d6f45aa4320a9e0ede2Paul Dagnelie         * that property or find another solution to the issues
286ef71398fb54b1d5007d6f45aa4320a9e0ede2Paul Dagnelie         * described in traverse_visitbp.
fa9e4066f08beec538e775443c5be79dd423fcabahrens         */
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass        if (P2PHASE(object, L1_dnode_count) == 0) {
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass            uint64_t offset;
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass            int error;
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass            if (os->os_rescan_dnodes) {
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass                offset = 0;
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass                os->os_rescan_dnodes = B_FALSE;
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass            } else {
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass                offset = object << DNODE_SHIFT;
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass            }
af346df58864e8fe897b1ff1a3a4c12f9294391bNed Bass            error = dnode_next_offset(DMU_META_DNODE(os),
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee                DNODE_FIND_HOLE,
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee                &offset, 2, DNODES_PER_BLOCK >> 2, 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens            if (error == 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens                object = offset >> DNODE_SHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens        }
503ad85c168c7992ccc310af845a581cff3c72b5Matthew Ahrens        os->os_obj_next = ++object;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock        /*
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock         * XXX We should check for an i/o error here and return
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock         * up to our caller.  Actually we should pre-read it in
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock         * dmu_tx_assign(), but there is currently no mechanism
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock         * to do so.
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock         */
503ad85c168c7992ccc310af845a581cff3c72b5Matthew Ahrens        (void) dnode_hold_impl(os, object, DNODE_MUST_BE_FREE,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock            FTAG, &dn);
fa9e4066f08beec538e775443c5be79dd423fcabahrens        if (dn)
fa9e4066f08beec538e775443c5be79dd423fcabahrens            break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
6754306ec9a89fd28806908d10c76141e8fbba3fahrens        if (dmu_object_next(os, &object, B_TRUE, 0) == 0)
503ad85c168c7992ccc310af845a581cff3c72b5Matthew Ahrens            os->os_obj_next = object - 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens    }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_rele(dn, FTAG);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
503ad85c168c7992ccc310af845a581cff3c72b5Matthew Ahrens    mutex_exit(&os->os_obj_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dmu_tx_add_new_object(tx, os, object);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    return (object);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot,
fa9e4066f08beec538e775443c5be79dd423fcabahrens    int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_t *dn;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock    int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock    if (object == DMU_META_DNODE_OBJECT && !dmu_tx_private_ok(tx))
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens        return (SET_ERROR(EBADF));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
503ad85c168c7992ccc310af845a581cff3c72b5Matthew Ahrens    err = dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, FTAG, &dn);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock    if (err)
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock        return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_rele(dn, FTAG);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dmu_tx_add_new_object(tx, os, object);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot,
e77d42eaa49fe55bfae1e0e0065c6e99affc001bMatthew Ahrens    int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_t *dn;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock    int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
2bf405a25eb25f79638fc951ff8d8857ad384417Mark Maybee    if (object == DMU_META_DNODE_OBJECT)
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens        return (SET_ERROR(EBADF));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
503ad85c168c7992ccc310af845a581cff3c72b5Matthew Ahrens    err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock        FTAG, &dn);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock    if (err)
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock        return (err);
2bf405a25eb25f79638fc951ff8d8857ad384417Mark Maybee
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx);
2bf405a25eb25f79638fc951ff8d8857ad384417Mark Maybee
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_rele(dn, FTAG);
cf04dda189f8e7f1d3245be8e387757e07c78e66Mark Maybee    return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrensdmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_t *dn;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock    int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock    ASSERT(object != DMU_META_DNODE_OBJECT || dmu_tx_private_ok(tx));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
503ad85c168c7992ccc310af845a581cff3c72b5Matthew Ahrens    err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock        FTAG, &dn);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock    if (err)
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock        return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    ASSERT(dn->dn_type != DMU_OT_NONE);
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee    dnode_free_range(dn, 0, DMU_OBJECT_END, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_free(dn, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    dnode_rele(dn, FTAG);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
a2cdcdd260232b58202b11a9bfc0103c9449ed52Paul Dagnelie/*
a2cdcdd260232b58202b11a9bfc0103c9449ed52Paul Dagnelie * Return (in *objectp) the next object which is allocated (or a hole)
a2cdcdd260232b58202b11a9bfc0103c9449ed52Paul Dagnelie * after *object, taking into account only objects that may have been modified
a2cdcdd260232b58202b11a9bfc0103c9449ed52Paul Dagnelie * after the specified txg.
a2cdcdd260232b58202b11a9bfc0103c9449ed52Paul Dagnelie */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
6754306ec9a89fd28806908d10c76141e8fbba3fahrensdmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole, uint64_t txg)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens    uint64_t offset = (*objectp + 1) << DNODE_SHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens    int error;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
744947dc83c634d985ed3ad79ac9c5e28d1865fdTom Erickson    error = dnode_next_offset(DMU_META_DNODE(os),
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee        (hole ? DNODE_FIND_HOLE : 0), &offset, 0, DNODES_PER_BLOCK, txg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    *objectp = offset >> DNODE_SHIFT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens/*
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens * Turn this object from old_type into DMU_OTN_ZAP_METADATA, and bump the
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens * refcount on SPA_FEATURE_EXTENSIBLE_DATASET.
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens *
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens * Only for use from syncing context, on MOS objects.
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens */
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrensvoid
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrensdmu_object_zapify(objset_t *mos, uint64_t object, dmu_object_type_t old_type,
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    dmu_tx_t *tx)
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens{
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    dnode_t *dn;
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    ASSERT(dmu_tx_is_syncing(tx));
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    VERIFY0(dnode_hold(mos, object, FTAG, &dn));
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    if (dn->dn_type == DMU_OTN_ZAP_METADATA) {
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens        dnode_rele(dn, FTAG);
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens        return;
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    }
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    ASSERT3U(dn->dn_type, ==, old_type);
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    ASSERT0(dn->dn_maxblkid);
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    dn->dn_next_type[tx->tx_txg & TXG_MASK] = dn->dn_type =
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens        DMU_OTN_ZAP_METADATA;
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    dnode_setdirty(dn, tx);
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    dnode_rele(dn, FTAG);
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    mzap_create_impl(mos, object, 0, 0, tx);
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    spa_feature_incr(dmu_objset_spa(mos),
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens        SPA_FEATURE_EXTENSIBLE_DATASET, tx);
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens}
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrensvoid
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrensdmu_object_free_zapified(objset_t *mos, uint64_t object, dmu_tx_t *tx)
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens{
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    dnode_t *dn;
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    dmu_object_type_t t;
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    ASSERT(dmu_tx_is_syncing(tx));
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    VERIFY0(dnode_hold(mos, object, FTAG, &dn));
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    t = dn->dn_type;
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    dnode_rele(dn, FTAG);
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    if (t == DMU_OTN_ZAP_METADATA) {
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens        spa_feature_decr(dmu_objset_spa(mos),
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens            SPA_FEATURE_EXTENSIBLE_DATASET, tx);
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    }
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens    VERIFY0(dmu_object_free(mos, object, tx));
2acef22db7808606888f8f92715629ff3ba555b9Matthew Ahrens}