1 /* 2 * CDDL HEADER START 3 * 4 * This file and its contents are supplied under the terms of the 5 * Common Development and Distribution License ("CDDL"), version 1.0. 6 * You may only use this file in accordance with the terms of version 7 * 1.0 of the CDDL. 8 * 9 * A full copy of the text of the CDDL should have accompanied this 10 * source. A copy of the CDDL is also available via the Internet at 11 * http://www.illumos.org/license/CDDL. 12 * 13 * CDDL HEADER END 14 */ 15 16 /* 17 * Copyright (c) 2015 by Delphix. All rights reserved. 18 */ 19 20 #include <sys/dmu_tx.h> 21 #include <sys/spa.h> 22 #include <sys/dmu.h> 23 #include <sys/dsl_pool.h> 24 #include <sys/vdev_indirect_births.h> 25 26 #ifdef ZFS_DEBUG 27 static boolean_t 28 vdev_indirect_births_verify(vdev_indirect_births_t *vib) 29 { 30 ASSERT(vib != NULL); 31 32 ASSERT(vib->vib_object != 0); 33 ASSERT(vib->vib_objset != NULL); 34 ASSERT(vib->vib_phys != NULL); 35 ASSERT(vib->vib_dbuf != NULL); 36 37 EQUIV(vib->vib_phys->vib_count > 0, vib->vib_entries != NULL); 38 39 return (B_TRUE); 40 } 41 #endif 42 43 uint64_t 44 vdev_indirect_births_count(vdev_indirect_births_t *vib) 45 { 46 ASSERT(vdev_indirect_births_verify(vib)); 47 48 return (vib->vib_phys->vib_count); 49 } 50 51 uint64_t 52 vdev_indirect_births_object(vdev_indirect_births_t *vib) 53 { 54 ASSERT(vdev_indirect_births_verify(vib)); 55 56 return (vib->vib_object); 57 } 58 59 static uint64_t 60 vdev_indirect_births_size_impl(vdev_indirect_births_t *vib) 61 { 62 return (vib->vib_phys->vib_count * sizeof (*vib->vib_entries)); 63 } 64 65 void 66 vdev_indirect_births_close(vdev_indirect_births_t *vib) 67 { 68 ASSERT(vdev_indirect_births_verify(vib)); 69 70 if (vib->vib_phys->vib_count > 0) { 71 uint64_t births_size = vdev_indirect_births_size_impl(vib); 72 73 vmem_free(vib->vib_entries, births_size); 74 vib->vib_entries = NULL; 75 } 76 77 dmu_buf_rele(vib->vib_dbuf, vib); 78 79 vib->vib_objset = NULL; 80 vib->vib_object = 0; 81 vib->vib_dbuf = NULL; 82 vib->vib_phys = NULL; 83 84 kmem_free(vib, sizeof (*vib)); 85 } 86 87 uint64_t 88 vdev_indirect_births_alloc(objset_t *os, dmu_tx_t *tx) 89 { 90 ASSERT(dmu_tx_is_syncing(tx)); 91 92 return (dmu_object_alloc(os, 93 DMU_OTN_UINT64_METADATA, SPA_OLD_MAXBLOCKSIZE, 94 DMU_OTN_UINT64_METADATA, sizeof (vdev_indirect_birth_phys_t), 95 tx)); 96 } 97 98 vdev_indirect_births_t * 99 vdev_indirect_births_open(objset_t *os, uint64_t births_object) 100 { 101 vdev_indirect_births_t *vib = kmem_zalloc(sizeof (*vib), KM_SLEEP); 102 103 vib->vib_objset = os; 104 vib->vib_object = births_object; 105 106 VERIFY0(dmu_bonus_hold(os, vib->vib_object, vib, &vib->vib_dbuf)); 107 vib->vib_phys = vib->vib_dbuf->db_data; 108 109 if (vib->vib_phys->vib_count > 0) { 110 uint64_t births_size = vdev_indirect_births_size_impl(vib); 111 vib->vib_entries = vmem_alloc(births_size, KM_SLEEP); 112 VERIFY0(dmu_read(vib->vib_objset, vib->vib_object, 0, 113 births_size, vib->vib_entries, DMU_READ_PREFETCH)); 114 } 115 116 ASSERT(vdev_indirect_births_verify(vib)); 117 118 return (vib); 119 } 120 121 void 122 vdev_indirect_births_free(objset_t *os, uint64_t object, dmu_tx_t *tx) 123 { 124 VERIFY0(dmu_object_free(os, object, tx)); 125 } 126 127 void 128 vdev_indirect_births_add_entry(vdev_indirect_births_t *vib, 129 uint64_t max_offset, uint64_t txg, dmu_tx_t *tx) 130 { 131 vdev_indirect_birth_entry_phys_t vibe; 132 uint64_t old_size; 133 uint64_t new_size; 134 vdev_indirect_birth_entry_phys_t *new_entries; 135 136 ASSERT(dmu_tx_is_syncing(tx)); 137 ASSERT(dsl_pool_sync_context(dmu_tx_pool(tx))); 138 ASSERT(vdev_indirect_births_verify(vib)); 139 140 dmu_buf_will_dirty(vib->vib_dbuf, tx); 141 142 vibe.vibe_offset = max_offset; 143 vibe.vibe_phys_birth_txg = txg; 144 145 old_size = vdev_indirect_births_size_impl(vib); 146 dmu_write(vib->vib_objset, vib->vib_object, old_size, sizeof (vibe), 147 &vibe, tx); 148 vib->vib_phys->vib_count++; 149 new_size = vdev_indirect_births_size_impl(vib); 150 151 new_entries = vmem_alloc(new_size, KM_SLEEP); 152 if (old_size > 0) { 153 bcopy(vib->vib_entries, new_entries, old_size); 154 vmem_free(vib->vib_entries, old_size); 155 } 156 new_entries[vib->vib_phys->vib_count - 1] = vibe; 157 vib->vib_entries = new_entries; 158 } 159 160 uint64_t 161 vdev_indirect_births_last_entry_txg(vdev_indirect_births_t *vib) 162 { 163 ASSERT(vdev_indirect_births_verify(vib)); 164 ASSERT(vib->vib_phys->vib_count > 0); 165 166 vdev_indirect_birth_entry_phys_t *last = 167 &vib->vib_entries[vib->vib_phys->vib_count - 1]; 168 return (last->vibe_phys_birth_txg); 169 } 170 171 /* 172 * Return the txg in which the given range was copied (i.e. its physical 173 * birth txg). The specified offset+asize must be contiguously mapped 174 * (i.e. not a split block). 175 * 176 * The entries are sorted by increasing phys_birth, and also by increasing 177 * offset. We find the specified offset by binary search. Note that we 178 * can not use bsearch() because looking at each entry independently is 179 * insufficient to find the correct entry. Each entry implicitly relies 180 * on the previous entry: an entry indicates that the offsets from the 181 * end of the previous entry to the end of this entry were written in the 182 * specified txg. 183 */ 184 uint64_t 185 vdev_indirect_births_physbirth(vdev_indirect_births_t *vib, uint64_t offset, 186 uint64_t asize) 187 { 188 vdev_indirect_birth_entry_phys_t *base; 189 vdev_indirect_birth_entry_phys_t *last; 190 191 ASSERT(vdev_indirect_births_verify(vib)); 192 ASSERT(vib->vib_phys->vib_count > 0); 193 194 base = vib->vib_entries; 195 last = base + vib->vib_phys->vib_count - 1; 196 197 ASSERT3U(offset, <, last->vibe_offset); 198 199 while (last >= base) { 200 vdev_indirect_birth_entry_phys_t *p = 201 base + ((last - base) / 2); 202 if (offset >= p->vibe_offset) { 203 base = p + 1; 204 } else if (p == vib->vib_entries || 205 offset >= (p - 1)->vibe_offset) { 206 ASSERT3U(offset + asize, <=, p->vibe_offset); 207 return (p->vibe_phys_birth_txg); 208 } else { 209 last = p - 1; 210 } 211 } 212 ASSERT(!"offset not found"); 213 return (-1); 214 } 215 216 #if defined(_KERNEL) 217 EXPORT_SYMBOL(vdev_indirect_births_add_entry); 218 EXPORT_SYMBOL(vdev_indirect_births_alloc); 219 EXPORT_SYMBOL(vdev_indirect_births_close); 220 EXPORT_SYMBOL(vdev_indirect_births_count); 221 EXPORT_SYMBOL(vdev_indirect_births_free); 222 EXPORT_SYMBOL(vdev_indirect_births_last_entry_txg); 223 EXPORT_SYMBOL(vdev_indirect_births_object); 224 EXPORT_SYMBOL(vdev_indirect_births_open); 225 EXPORT_SYMBOL(vdev_indirect_births_physbirth); 226 #endif 227