kernel/fs/zfs/ddt_zap.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25
  26 #include <sys/zfs_context.h>
  27 #include <sys/spa.h>
  28 #include <sys/zio.h>
  29 #include <sys/ddt.h>
  30 #include <sys/zap.h>
  31 #include <sys/dmu_tx.h>
  32 #include <util/sscanf.h>
  33
  34 int ddt_zap_leaf_blockshift = 12;
  35 int ddt_zap_indirect_blockshift = 12;
  36
  37 static int
  38 ddt_zap_create(objset_t *os, uint64_t *objectp, dmu_tx_t *tx, boolean_t prehash)
  39 {
  40         zap_flags_t flags = ZAP_FLAG_HASH64 | ZAP_FLAG_UINT64_KEY;
  41
  42         if (prehash)
  43                 flags |= ZAP_FLAG_PRE_HASHED_KEY;
  44
  45         *objectp = zap_create_flags(os, 0, flags, DMU_OT_DDT_ZAP,
  46             ddt_zap_leaf_blockshift, ddt_zap_indirect_blockshift,
  47             DMU_OT_NONE, 0, tx);
  48
  49         return (*objectp == 0 ? ENOTSUP : 0);
  50 }
  51
  52 static int
  53 ddt_zap_destroy(objset_t *os, uint64_t object, dmu_tx_t *tx)
  54 {
  55         return (zap_destroy(os, object, tx));
  56 }
  57
  58 static int
  59 ddt_zap_lookup(objset_t *os, uint64_t object, ddt_entry_t *dde)
  60 {
  61         uchar_t cbuf[sizeof (dde->dde_phys) + 1];
  62         uint64_t one, csize;
  63         int error;
  64
  65         error = zap_length_uint64(os, object, (uint64_t *)&dde->dde_key,
  66             DDT_KEY_WORDS, &one, &csize);
  67         if (error)
  68                 return (error);
  69
  70         ASSERT(one == 1);
  71         ASSERT(csize <= sizeof (cbuf));
  72
  73         error = zap_lookup_uint64(os, object, (uint64_t *)&dde->dde_key,
  74             DDT_KEY_WORDS, 1, csize, cbuf);
  75         if (error)
  76                 return (error);
  77
  78         ddt_decompress(cbuf, dde->dde_phys, csize, sizeof (dde->dde_phys));
  79
  80         return (0);
  81 }
  82
  83 static void
  84 ddt_zap_prefetch(objset_t *os, uint64_t object, ddt_entry_t *dde)
  85 {
  86         (void) zap_prefetch_uint64(os, object, (uint64_t *)&dde->dde_key,
  87             DDT_KEY_WORDS);
  88 }
  89
  90 static int
  91 ddt_zap_update(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx)
  92 {
  93         uchar_t cbuf[sizeof (dde->dde_phys) + 1];
  94         uint64_t csize;
  95
  96         csize = ddt_compress(dde->dde_phys, cbuf,
  97             sizeof (dde->dde_phys), sizeof (cbuf));
  98
  99         return (zap_update_uint64(os, object, (uint64_t *)&dde->dde_key,
 100             DDT_KEY_WORDS, 1, csize, cbuf, tx));
 101 }
 102
 103 static int
 104 ddt_zap_remove(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx)
 105 {
 106         return (zap_remove_uint64(os, object, (uint64_t *)&dde->dde_key,
 107             DDT_KEY_WORDS, tx));
 108 }
 109
 110 static int
 111 ddt_zap_walk(objset_t *os, uint64_t object, ddt_entry_t *dde, uint64_t *walk)
 112 {
 113         zap_cursor_t zc;
 114         zap_attribute_t za;
 115         int error;
 116
 117         zap_cursor_init_serialized(&zc, os, object, *walk);
 118         if ((error = zap_cursor_retrieve(&zc, &za)) == 0) {
 119                 uchar_t cbuf[sizeof (dde->dde_phys) + 1];
 120                 uint64_t csize = za.za_num_integers;
 121                 ASSERT(za.za_integer_length == 1);
 122                 error = zap_lookup_uint64(os, object, (uint64_t *)za.za_name,
 123                     DDT_KEY_WORDS, 1, csize, cbuf);
 124                 ASSERT(error == 0);
 125                 if (error == 0) {
 126                         ddt_decompress(cbuf, dde->dde_phys, csize,
 127                             sizeof (dde->dde_phys));
 128                         dde->dde_key = *(ddt_key_t *)za.za_name;
 129                 }
 130                 zap_cursor_advance(&zc);
 131                 *walk = zap_cursor_serialize(&zc);
 132         }
 133         zap_cursor_fini(&zc);
 134         return (error);
 135 }
 136
 137 static uint64_t
 138 ddt_zap_count(objset_t *os, uint64_t object)
 139 {
 140         uint64_t count = 0;
 141
 142         VERIFY(zap_count(os, object, &count) == 0);
 143
 144         return (count);
 145 }
 146
 147 const ddt_ops_t ddt_zap_ops = {
 148         "zap",
 149         ddt_zap_create,
 150         ddt_zap_destroy,
 151         ddt_zap_lookup,
 152         ddt_zap_prefetch,
 153         ddt_zap_update,
 154         ddt_zap_remove,
 155         ddt_zap_walk,
 156         ddt_zap_count,
 157 };