/* * 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) 2009, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2018 by Delphix. All rights reserved. */ #include <sys/zfs_context.h> #include <sys/spa.h> #include <sys/zio.h> #include <sys/ddt.h> #include <sys/zap.h> #include <sys/dmu_tx.h> static const int ddt_zap_leaf_blockshift = 12; static const int ddt_zap_indirect_blockshift = 12; static int ddt_zap_create(objset_t *os, uint64_t *objectp, dmu_tx_t *tx, boolean_t prehash) { zap_flags_t flags = ZAP_FLAG_HASH64 | ZAP_FLAG_UINT64_KEY; if (prehash) flags |= ZAP_FLAG_PRE_HASHED_KEY; *objectp = zap_create_flags(os, 0, flags, DMU_OT_DDT_ZAP, ddt_zap_leaf_blockshift, ddt_zap_indirect_blockshift, DMU_OT_NONE, 0, tx); return (*objectp == 0 ? SET_ERROR(ENOTSUP) : 0); } static int ddt_zap_destroy(objset_t *os, uint64_t object, dmu_tx_t *tx) { return (zap_destroy(os, object, tx)); } static int ddt_zap_lookup(objset_t *os, uint64_t object, ddt_entry_t *dde) { uchar_t *cbuf; uint64_t one, csize; int error; cbuf = kmem_alloc(sizeof (dde->dde_phys) + 1, KM_SLEEP); error = zap_length_uint64(os, object, (uint64_t *)&dde->dde_key, DDT_KEY_WORDS, &one, &csize); if (error) goto out; ASSERT(one == 1); ASSERT(csize <= (sizeof (dde->dde_phys) + 1)); error = zap_lookup_uint64(os, object, (uint64_t *)&dde->dde_key, DDT_KEY_WORDS, 1, csize, cbuf); if (error) goto out; ddt_decompress(cbuf, dde->dde_phys, csize, sizeof (dde->dde_phys)); out: kmem_free(cbuf, sizeof (dde->dde_phys) + 1); return (error); } static void ddt_zap_prefetch(objset_t *os, uint64_t object, ddt_entry_t *dde) { (void) zap_prefetch_uint64(os, object, (uint64_t *)&dde->dde_key, DDT_KEY_WORDS); } static int ddt_zap_update(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx) { uchar_t cbuf[sizeof (dde->dde_phys) + 1]; uint64_t csize; csize = ddt_compress(dde->dde_phys, cbuf, sizeof (dde->dde_phys), sizeof (cbuf)); return (zap_update_uint64(os, object, (uint64_t *)&dde->dde_key, DDT_KEY_WORDS, 1, csize, cbuf, tx)); } static int ddt_zap_remove(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx) { return (zap_remove_uint64(os, object, (uint64_t *)&dde->dde_key, DDT_KEY_WORDS, tx)); } static int ddt_zap_walk(objset_t *os, uint64_t object, ddt_entry_t *dde, uint64_t *walk) { zap_cursor_t zc; zap_attribute_t za; int error; if (*walk == 0) { /* * We don't want to prefetch the entire ZAP object, because * it can be enormous. Also the primary use of DDT iteration * is for scrubbing, in which case we will be issuing many * scrub I/Os for each ZAP block that we read in, so * reading the ZAP is unlikely to be the bottleneck. */ zap_cursor_init_noprefetch(&zc, os, object); } else { zap_cursor_init_serialized(&zc, os, object, *walk); } if ((error = zap_cursor_retrieve(&zc, &za)) == 0) { uchar_t cbuf[sizeof (dde->dde_phys) + 1]; uint64_t csize = za.za_num_integers; ASSERT(za.za_integer_length == 1); error = zap_lookup_uint64(os, object, (uint64_t *)za.za_name, DDT_KEY_WORDS, 1, csize, cbuf); ASSERT(error == 0); if (error == 0) { ddt_decompress(cbuf, dde->dde_phys, csize, sizeof (dde->dde_phys)); dde->dde_key = *(ddt_key_t *)za.za_name; } zap_cursor_advance(&zc); *walk = zap_cursor_serialize(&zc); } zap_cursor_fini(&zc); return (error); } static int ddt_zap_count(objset_t *os, uint64_t object, uint64_t *count) { return (zap_count(os, object, count)); } const ddt_ops_t ddt_zap_ops = { "zap", ddt_zap_create, ddt_zap_destroy, ddt_zap_lookup, ddt_zap_prefetch, ddt_zap_update, ddt_zap_remove, ddt_zap_walk, ddt_zap_count, };