Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 1 | // Copyright 2020 The Pigweed Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| 4 | // use this file except in compliance with the License. You may obtain a copy of |
| 5 | // the License at |
| 6 | // |
| 7 | // https://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 11 | // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 12 | // License for the specific language governing permissions and limitations under |
| 13 | // the License. |
| 14 | |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 15 | #include "pw_kvs/key_value_store.h" |
| 16 | |
Wyatt Hepler | bab0e20 | 2020-02-04 07:40:08 -0800 | [diff] [blame] | 17 | #include <algorithm> |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 18 | #include <cinttypes> |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 19 | #include <cstring> |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 20 | #include <type_traits> |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 21 | |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 22 | #define PW_LOG_USE_ULTRA_SHORT_NAMES 1 |
Wyatt Hepler | d31d970 | 2020-02-14 08:46:36 -0800 | [diff] [blame] | 23 | #include "pw_kvs_private/entry.h" |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 24 | #include "pw_kvs_private/macros.h" |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 25 | #include "pw_log/log.h" |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 26 | |
Wyatt Hepler | 2ad6067 | 2020-01-21 08:00:16 -0800 | [diff] [blame] | 27 | namespace pw::kvs { |
Wyatt Hepler | a00d1ef | 2020-02-14 14:31:26 -0800 | [diff] [blame^] | 28 | namespace { |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 29 | |
Wyatt Hepler | acaacf9 | 2020-01-24 10:58:30 -0800 | [diff] [blame] | 30 | using std::byte; |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 31 | using std::string_view; |
Wyatt Hepler | acaacf9 | 2020-01-24 10:58:30 -0800 | [diff] [blame] | 32 | |
Wyatt Hepler | a00d1ef | 2020-02-14 14:31:26 -0800 | [diff] [blame^] | 33 | constexpr bool InvalidKey(std::string_view key) { |
| 34 | return key.empty() || (key.size() > Entry::kMaxKeyLength); |
| 35 | } |
| 36 | |
| 37 | } // namespace |
| 38 | |
Wyatt Hepler | ad0a793 | 2020-02-06 08:20:38 -0800 | [diff] [blame] | 39 | KeyValueStore::KeyValueStore(FlashPartition* partition, |
| 40 | const EntryHeaderFormat& format, |
| 41 | const Options& options) |
| 42 | : partition_(*partition), |
| 43 | entry_header_format_(format), |
| 44 | options_(options), |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 45 | sectors_(partition_.sector_count()), |
| 46 | last_new_sector_(sectors_.data()), |
Wyatt Hepler | ad0a793 | 2020-02-06 08:20:38 -0800 | [diff] [blame] | 47 | working_buffer_{} {} |
| 48 | |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 49 | Status KeyValueStore::Init() { |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 50 | if (kMaxUsableSectors < sectors_.size()) { |
Wyatt Hepler | ad0a793 | 2020-02-06 08:20:38 -0800 | [diff] [blame] | 51 | CRT("KeyValueStore::kMaxUsableSectors must be at least as large as the " |
| 52 | "number of sectors in the flash partition"); |
| 53 | return Status::FAILED_PRECONDITION; |
| 54 | } |
| 55 | |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 56 | if (kMaxUsableSectors > sectors_.size()) { |
Wyatt Hepler | ad0a793 | 2020-02-06 08:20:38 -0800 | [diff] [blame] | 57 | DBG("KeyValueStore::kMaxUsableSectors is %zu sectors larger than needed", |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 58 | kMaxUsableSectors - sectors_.size()); |
Wyatt Hepler | ad0a793 | 2020-02-06 08:20:38 -0800 | [diff] [blame] | 59 | } |
| 60 | |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 61 | // Reset the number of occupied key descriptors; we will fill them later. |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 62 | key_descriptors_.clear(); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 63 | |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 64 | // TODO: init last_new_sector_ to a random sector. Since the on-flash stored |
| 65 | // information does not allow recovering the previous last_new_sector_ after |
| 66 | // clean start, random is a good second choice. |
| 67 | |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 68 | const size_t sector_size_bytes = partition_.sector_size_bytes(); |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 69 | |
David Rogers | f0a3544 | 2020-02-04 12:16:38 -0800 | [diff] [blame] | 70 | if (working_buffer_.size() < sector_size_bytes) { |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 71 | CRT("working_buffer_ (%zu bytes) is smaller than sector size (%zu bytes)", |
David Rogers | f0a3544 | 2020-02-04 12:16:38 -0800 | [diff] [blame] | 72 | working_buffer_.size(), |
| 73 | sector_size_bytes); |
| 74 | return Status::INVALID_ARGUMENT; |
| 75 | } |
| 76 | |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 77 | DBG("First pass: Read all entries from all sectors"); |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 78 | for (size_t sector_id = 0; sector_id < sectors_.size(); ++sector_id) { |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 79 | // Track writable bytes in this sector. Updated after reading each entry. |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 80 | sectors_[sector_id].tail_free_bytes = sector_size_bytes; |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 81 | |
| 82 | const Address sector_address = sector_id * sector_size_bytes; |
| 83 | Address entry_address = sector_address; |
| 84 | |
| 85 | for (int num_entries_in_sector = 0;; num_entries_in_sector++) { |
| 86 | DBG("Load entry: sector=%zu, entry#=%d, address=%zu", |
| 87 | sector_id, |
| 88 | num_entries_in_sector, |
| 89 | size_t(entry_address)); |
| 90 | |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 91 | if (!AddressInSector(sectors_[sector_id], entry_address)) { |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 92 | DBG("Fell off end of sector; moving to the next sector"); |
| 93 | break; |
| 94 | } |
| 95 | |
| 96 | Address next_entry_address; |
| 97 | Status status = LoadEntry(entry_address, &next_entry_address); |
| 98 | if (status == Status::NOT_FOUND) { |
| 99 | DBG("Hit un-written data in sector; moving to the next sector"); |
| 100 | break; |
| 101 | } |
| 102 | if (status == Status::DATA_LOSS) { |
| 103 | // It's not clear KVS can make a unilateral decision about what to do |
| 104 | // in corruption cases. It's an application decision, for which we |
| 105 | // should offer some configurability. For now, entirely bail out of |
| 106 | // loading and give up. |
| 107 | // |
| 108 | // Later, scan for remaining valid keys; since it's entirely possible |
| 109 | // that there is a duplicate of the key elsewhere and everything is |
| 110 | // fine. Later, we can wipe and maybe recover the sector. |
| 111 | // |
| 112 | // TODO: Implement rest-of-sector scanning for valid entries. |
| 113 | return Status::DATA_LOSS; |
| 114 | } |
| 115 | TRY(status); |
| 116 | |
| 117 | // Entry loaded successfully; so get ready to load the next one. |
| 118 | entry_address = next_entry_address; |
| 119 | |
| 120 | // Update of the number of writable bytes in this sector. |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 121 | sectors_[sector_id].tail_free_bytes = |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 122 | sector_size_bytes - (entry_address - sector_address); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | DBG("Second pass: Count valid bytes in each sector"); |
| 127 | // Initialize the sector sizes. |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 128 | for (SectorDescriptor& sector : sectors_) { |
| 129 | sector.valid_bytes = 0; |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 130 | } |
| 131 | // For every valid key, increment the valid bytes for that sector. |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 132 | for (KeyDescriptor& key_descriptor : key_descriptors_) { |
| 133 | uint32_t sector_id = key_descriptor.address / sector_size_bytes; |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 134 | Entry entry; |
| 135 | TRY(Entry::Read(partition_, key_descriptor.address, &entry)); |
| 136 | sectors_[sector_id].valid_bytes += entry.size(); |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 137 | } |
Wyatt Hepler | 729f28c | 2020-02-05 09:46:00 -0800 | [diff] [blame] | 138 | initialized_ = true; |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 139 | return Status::OK; |
| 140 | } |
| 141 | |
| 142 | Status KeyValueStore::LoadEntry(Address entry_address, |
| 143 | Address* next_entry_address) { |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 144 | Entry entry; |
| 145 | TRY(Entry::Read(partition_, entry_address, &entry)); |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 146 | |
| 147 | // TODO: Handle multiple magics for formats that have changed. |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 148 | if (entry.magic() != entry_header_format_.magic) { |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 149 | // TODO: It may be cleaner to have some logging helpers for these cases. |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 150 | ERR("Found corrupt magic: %zx; expecting %zx; at address %zx", |
| 151 | size_t(entry.magic()), |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 152 | size_t(entry_header_format_.magic), |
| 153 | size_t(entry_address)); |
| 154 | return Status::DATA_LOSS; |
| 155 | } |
| 156 | |
| 157 | // Read the key from flash & validate the entry (which reads the value). |
Wyatt Hepler | a00d1ef | 2020-02-14 14:31:26 -0800 | [diff] [blame^] | 158 | Entry::KeyBuffer key_buffer; |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 159 | TRY_ASSIGN(size_t key_length, entry.ReadKey(key_buffer)); |
| 160 | const string_view key(key_buffer.data(), key_length); |
Wyatt Hepler | bab0e20 | 2020-02-04 07:40:08 -0800 | [diff] [blame] | 161 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 162 | TRY(entry.VerifyChecksumInFlash(entry_header_format_.checksum)); |
Wyatt Hepler | 4d78cd6 | 2020-02-05 13:05:58 -0800 | [diff] [blame] | 163 | |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 164 | KeyDescriptor key_descriptor( |
| 165 | key, |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 166 | entry.key_version(), |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 167 | entry_address, |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 168 | entry.deleted() ? KeyDescriptor::kDeleted : KeyDescriptor::kValid); |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 169 | |
| 170 | DBG("Key hash: %zx (%zu)", |
| 171 | size_t(key_descriptor.key_hash), |
| 172 | size_t(key_descriptor.key_hash)); |
| 173 | |
| 174 | TRY(AppendNewOrOverwriteStaleExistingDescriptor(key_descriptor)); |
| 175 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 176 | *next_entry_address = entry.next_address(); |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 177 | return Status::OK; |
| 178 | } |
| 179 | |
| 180 | // TODO: This method is the trigger of the O(valid_entries * all_entries) time |
| 181 | // complexity for reading. At some cost to memory, this could be optimized by |
| 182 | // using a hash table instead of scanning, but in practice this should be fine |
| 183 | // for a small number of keys |
| 184 | Status KeyValueStore::AppendNewOrOverwriteStaleExistingDescriptor( |
| 185 | const KeyDescriptor& key_descriptor) { |
| 186 | // With the new key descriptor, either add it to the descriptor table or |
| 187 | // overwrite an existing entry with an older version of the key. |
| 188 | KeyDescriptor* existing_descriptor = FindDescriptor(key_descriptor.key_hash); |
| 189 | if (existing_descriptor) { |
| 190 | if (existing_descriptor->key_version < key_descriptor.key_version) { |
| 191 | // Existing entry is old; replace the existing entry with the new one. |
| 192 | *existing_descriptor = key_descriptor; |
| 193 | } else { |
| 194 | // Otherwise, check for data integrity and leave the existing entry. |
| 195 | if (existing_descriptor->key_version == key_descriptor.key_version) { |
| 196 | ERR("Data loss: Duplicated old(=%zu) and new(=%zu) version", |
| 197 | size_t(existing_descriptor->key_version), |
| 198 | size_t(key_descriptor.key_version)); |
| 199 | return Status::DATA_LOSS; |
| 200 | } |
| 201 | DBG("Found stale entry when appending; ignoring"); |
| 202 | } |
| 203 | return Status::OK; |
| 204 | } |
| 205 | // Write new entry. |
| 206 | KeyDescriptor* newly_allocated_key_descriptor; |
| 207 | TRY(AppendEmptyDescriptor(&newly_allocated_key_descriptor)); |
| 208 | *newly_allocated_key_descriptor = key_descriptor; |
| 209 | return Status::OK; |
| 210 | } |
| 211 | |
| 212 | // TODO: Need a better name. |
| 213 | Status KeyValueStore::AppendEmptyDescriptor(KeyDescriptor** new_descriptor) { |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 214 | if (key_descriptors_.full()) { |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 215 | return Status::RESOURCE_EXHAUSTED; |
| 216 | } |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 217 | key_descriptors_.emplace_back(); |
| 218 | *new_descriptor = &key_descriptors_.back(); |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 219 | return Status::OK; |
| 220 | } |
| 221 | |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 222 | KeyValueStore::KeyDescriptor* KeyValueStore::FindDescriptor(uint32_t hash) { |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 223 | for (KeyDescriptor& key_descriptor : key_descriptors_) { |
| 224 | if (key_descriptor.key_hash == hash) { |
| 225 | return &key_descriptor; |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 226 | } |
| 227 | } |
| 228 | return nullptr; |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | StatusWithSize KeyValueStore::Get(string_view key, |
| 232 | span<byte> value_buffer) const { |
Wyatt Hepler | 50f7077 | 2020-02-13 11:25:10 -0800 | [diff] [blame] | 233 | TRY_WITH_SIZE(CheckOperation(key)); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 234 | |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 235 | const KeyDescriptor* key_descriptor; |
Wyatt Hepler | 2d40169 | 2020-02-13 16:01:23 -0800 | [diff] [blame] | 236 | TRY_WITH_SIZE(FindExistingKeyDescriptor(key, &key_descriptor)); |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 237 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 238 | Entry entry; |
| 239 | TRY_WITH_SIZE(Entry::Read(partition_, key_descriptor->address, &entry)); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 240 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 241 | StatusWithSize result = entry.ReadValue(value_buffer); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 242 | if (result.ok() && options_.verify_on_read) { |
David Rogers | cf680ab | 2020-02-12 23:28:32 -0800 | [diff] [blame] | 243 | Status verify_result = |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 244 | entry.VerifyChecksum(entry_header_format_.checksum, |
| 245 | key, |
| 246 | value_buffer.subspan(0, result.size())); |
David Rogers | cf680ab | 2020-02-12 23:28:32 -0800 | [diff] [blame] | 247 | if (!verify_result.ok()) { |
Wyatt Hepler | 50f7077 | 2020-02-13 11:25:10 -0800 | [diff] [blame] | 248 | std::memset( |
| 249 | value_buffer.subspan(0, result.size()).data(), 0, result.size()); |
| 250 | return StatusWithSize(verify_result); |
David Rogers | cf680ab | 2020-02-12 23:28:32 -0800 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | return StatusWithSize(verify_result, result.size()); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 254 | } |
| 255 | return result; |
| 256 | } |
| 257 | |
| 258 | Status KeyValueStore::Put(string_view key, span<const byte> value) { |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 259 | DBG("Writing key/value; key length=%zu, value length=%zu", |
| 260 | key.size(), |
| 261 | value.size()); |
Wyatt Hepler | 729f28c | 2020-02-05 09:46:00 -0800 | [diff] [blame] | 262 | |
| 263 | TRY(CheckOperation(key)); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 264 | |
| 265 | if (value.size() > (1 << 24)) { |
| 266 | // TODO: Reject sizes that are larger than the maximum? |
| 267 | } |
| 268 | |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 269 | KeyDescriptor* key_descriptor; |
Wyatt Hepler | 2d40169 | 2020-02-13 16:01:23 -0800 | [diff] [blame] | 270 | Status status = FindKeyDescriptor(key, &key_descriptor); |
| 271 | |
| 272 | if (status.ok()) { |
David Rogers | 3464d0a | 2020-02-07 11:45:46 -0800 | [diff] [blame] | 273 | DBG("Writing over existing entry for key 0x%08" PRIx32 " in sector %zu", |
| 274 | key_descriptor->key_hash, |
| 275 | SectorIndex(SectorFromAddress(key_descriptor->address))); |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 276 | return WriteEntryForExistingKey( |
| 277 | key_descriptor, KeyDescriptor::kValid, key, value); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 278 | } |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 279 | |
Wyatt Hepler | 2d40169 | 2020-02-13 16:01:23 -0800 | [diff] [blame] | 280 | if (status == Status::NOT_FOUND) { |
| 281 | return WriteEntryForNewKey(key, value); |
| 282 | } |
| 283 | |
| 284 | return status; |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 285 | } |
| 286 | |
| 287 | Status KeyValueStore::Delete(string_view key) { |
Wyatt Hepler | 729f28c | 2020-02-05 09:46:00 -0800 | [diff] [blame] | 288 | TRY(CheckOperation(key)); |
| 289 | |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 290 | KeyDescriptor* key_descriptor; |
Wyatt Hepler | 2d40169 | 2020-02-13 16:01:23 -0800 | [diff] [blame] | 291 | TRY(FindExistingKeyDescriptor(key, &key_descriptor)); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 292 | |
David Rogers | 3464d0a | 2020-02-07 11:45:46 -0800 | [diff] [blame] | 293 | DBG("Writing tombstone for existing key 0x%08" PRIx32 " in sector %zu", |
| 294 | key_descriptor->key_hash, |
| 295 | SectorIndex(SectorFromAddress(key_descriptor->address))); |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 296 | return WriteEntryForExistingKey( |
| 297 | key_descriptor, KeyDescriptor::kDeleted, key, {}); |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | KeyValueStore::iterator& KeyValueStore::iterator::operator++() { |
| 301 | // Skip to the next entry that is valid (not deleted). |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 302 | while (++index_ < item_.kvs_.key_descriptors_.size() && |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 303 | descriptor().deleted()) { |
| 304 | } |
| 305 | return *this; |
| 306 | } |
| 307 | |
| 308 | const KeyValueStore::Item& KeyValueStore::iterator::operator*() { |
| 309 | std::memset(item_.key_buffer_.data(), 0, item_.key_buffer_.size()); |
| 310 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 311 | Entry entry; |
| 312 | if (Entry::Read(item_.kvs_.partition_, descriptor().address, &entry).ok()) { |
| 313 | entry.ReadKey(item_.key_buffer_); |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 314 | } |
| 315 | |
| 316 | return item_; |
| 317 | } |
| 318 | |
| 319 | KeyValueStore::iterator KeyValueStore::begin() const { |
| 320 | size_t i = 0; |
| 321 | // Skip over any deleted entries at the start of the descriptor list. |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 322 | while (i < key_descriptors_.size() && key_descriptors_[i].deleted()) { |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 323 | i += 1; |
| 324 | } |
| 325 | return iterator(*this, i); |
| 326 | } |
| 327 | |
| 328 | // TODO(hepler): The valid entry count could be tracked in the KVS to avoid the |
| 329 | // need for this for-loop. |
| 330 | size_t KeyValueStore::size() const { |
| 331 | size_t valid_entries = 0; |
| 332 | |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 333 | for (const KeyDescriptor& key_descriptor : key_descriptors_) { |
| 334 | if (!key_descriptor.deleted()) { |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 335 | valid_entries += 1; |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | return valid_entries; |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 340 | } |
| 341 | |
Wyatt Hepler | ed163b0 | 2020-02-03 17:49:32 -0800 | [diff] [blame] | 342 | StatusWithSize KeyValueStore::ValueSize(std::string_view key) const { |
Wyatt Hepler | 50f7077 | 2020-02-13 11:25:10 -0800 | [diff] [blame] | 343 | TRY_WITH_SIZE(CheckOperation(key)); |
Wyatt Hepler | ed163b0 | 2020-02-03 17:49:32 -0800 | [diff] [blame] | 344 | |
| 345 | const KeyDescriptor* key_descriptor; |
Wyatt Hepler | 2d40169 | 2020-02-13 16:01:23 -0800 | [diff] [blame] | 346 | TRY_WITH_SIZE(FindExistingKeyDescriptor(key, &key_descriptor)); |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 347 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 348 | Entry entry; |
| 349 | TRY_WITH_SIZE(Entry::Read(partition_, key_descriptor->address, &entry)); |
Wyatt Hepler | ed163b0 | 2020-02-03 17:49:32 -0800 | [diff] [blame] | 350 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 351 | return StatusWithSize(entry.value_size()); |
Wyatt Hepler | ed163b0 | 2020-02-03 17:49:32 -0800 | [diff] [blame] | 352 | } |
| 353 | |
Wyatt Hepler | 4d78cd6 | 2020-02-05 13:05:58 -0800 | [diff] [blame] | 354 | uint32_t KeyValueStore::HashKey(string_view string) { |
| 355 | uint32_t hash = 0; |
| 356 | uint32_t coefficient = 65599u; |
| 357 | |
| 358 | for (char ch : string) { |
| 359 | hash += coefficient * unsigned(ch); |
| 360 | coefficient *= 65599u; |
| 361 | } |
| 362 | |
| 363 | return hash; |
| 364 | } |
| 365 | |
Wyatt Hepler | 6e3a83b | 2020-02-04 07:36:45 -0800 | [diff] [blame] | 366 | Status KeyValueStore::FixedSizeGet(std::string_view key, |
| 367 | byte* value, |
| 368 | size_t size_bytes) const { |
| 369 | // Ensure that the size of the stored value matches the size of the type. |
| 370 | // Otherwise, report error. This check avoids potential memory corruption. |
| 371 | StatusWithSize result = ValueSize(key); |
| 372 | if (!result.ok()) { |
| 373 | return result.status(); |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 374 | } |
Wyatt Hepler | 6e3a83b | 2020-02-04 07:36:45 -0800 | [diff] [blame] | 375 | if (result.size() != size_bytes) { |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 376 | DBG("Requested %zu B read, but value is %zu B", size_bytes, result.size()); |
Wyatt Hepler | 6e3a83b | 2020-02-04 07:36:45 -0800 | [diff] [blame] | 377 | return Status::INVALID_ARGUMENT; |
Wyatt Hepler | bab0e20 | 2020-02-04 07:40:08 -0800 | [diff] [blame] | 378 | } |
Wyatt Hepler | 6e3a83b | 2020-02-04 07:36:45 -0800 | [diff] [blame] | 379 | return Get(key, span(value, size_bytes)).status(); |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 380 | } |
| 381 | |
Wyatt Hepler | 729f28c | 2020-02-05 09:46:00 -0800 | [diff] [blame] | 382 | Status KeyValueStore::CheckOperation(string_view key) const { |
Wyatt Hepler | acaacf9 | 2020-01-24 10:58:30 -0800 | [diff] [blame] | 383 | if (InvalidKey(key)) { |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 384 | return Status::INVALID_ARGUMENT; |
| 385 | } |
Wyatt Hepler | 729f28c | 2020-02-05 09:46:00 -0800 | [diff] [blame] | 386 | if (!initialized_) { |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 387 | return Status::FAILED_PRECONDITION; |
| 388 | } |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 389 | return Status::OK; |
| 390 | } |
| 391 | |
Wyatt Hepler | 2d40169 | 2020-02-13 16:01:23 -0800 | [diff] [blame] | 392 | // Searches for a KeyDescriptor that matches this key and sets *result to point |
| 393 | // to it if one is found. |
| 394 | // |
| 395 | // OK: there is a matching descriptor and *result is set |
| 396 | // NOT_FOUND: there is no descriptor that matches this key, but this key |
| 397 | // has a unique hash (and could potentially be added to the KVS) |
| 398 | // ALREADY_EXISTS: there is no descriptor that matches this key, but the |
| 399 | // key's hash collides with the hash for an existing descriptor |
| 400 | // |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 401 | Status KeyValueStore::FindKeyDescriptor(string_view key, |
| 402 | const KeyDescriptor** result) const { |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 403 | const uint32_t hash = HashKey(key); |
Wyatt Hepler | a00d1ef | 2020-02-14 14:31:26 -0800 | [diff] [blame^] | 404 | Entry::KeyBuffer key_buffer; |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 405 | |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 406 | for (auto& descriptor : key_descriptors_) { |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 407 | if (descriptor.key_hash == hash) { |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 408 | TRY(Entry::ReadKey( |
Wyatt Hepler | a00d1ef | 2020-02-14 14:31:26 -0800 | [diff] [blame^] | 409 | partition_, descriptor.address, key.size(), key_buffer.data())); |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 410 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 411 | if (key == string_view(key_buffer.data(), key.size())) { |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 412 | DBG("Found match for key hash 0x%08" PRIx32, hash); |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 413 | *result = &descriptor; |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 414 | return Status::OK; |
Wyatt Hepler | 2d40169 | 2020-02-13 16:01:23 -0800 | [diff] [blame] | 415 | } else { |
| 416 | WRN("Found key hash collision for 0x%08" PRIx32, hash); |
| 417 | return Status::ALREADY_EXISTS; |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 418 | } |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 419 | } |
| 420 | } |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 421 | return Status::NOT_FOUND; |
| 422 | } |
| 423 | |
Wyatt Hepler | 2d40169 | 2020-02-13 16:01:23 -0800 | [diff] [blame] | 424 | // Searches for a KeyDescriptor that matches this key and sets *result to point |
| 425 | // to it if one is found. |
| 426 | // |
| 427 | // OK: there is a matching descriptor and *result is set |
| 428 | // NOT_FOUND: there is no descriptor that matches this key |
| 429 | // |
| 430 | Status KeyValueStore::FindExistingKeyDescriptor( |
| 431 | string_view key, const KeyDescriptor** result) const { |
| 432 | Status status = FindKeyDescriptor(key, result); |
| 433 | |
| 434 | // If the key's hash collides with an existing key or if the key is deleted, |
| 435 | // treat it as if it is not in the KVS. |
| 436 | if (status == Status::ALREADY_EXISTS || |
| 437 | (status.ok() && (*result)->deleted())) { |
| 438 | return Status::NOT_FOUND; |
| 439 | } |
| 440 | return status; |
| 441 | } |
| 442 | |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 443 | Status KeyValueStore::WriteEntryForExistingKey(KeyDescriptor* key_descriptor, |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 444 | KeyDescriptor::State new_state, |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 445 | string_view key, |
| 446 | span<const byte> value) { |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 447 | // Find the original entry and sector to update the sector's valid_bytes. |
Wyatt Hepler | 30a5215 | 2020-02-12 11:26:05 -0800 | [diff] [blame] | 448 | Entry original_entry; |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 449 | TRY(Entry::Read(partition_, key_descriptor->address, &original_entry)); |
David Rogers | 3464d0a | 2020-02-07 11:45:46 -0800 | [diff] [blame] | 450 | SectorDescriptor* old_sector = SectorFromAddress(key_descriptor->address); |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 451 | |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 452 | SectorDescriptor* sector; |
Wyatt Hepler | 97fc794 | 2020-02-06 15:55:45 -0800 | [diff] [blame] | 453 | TRY(FindOrRecoverSectorWithSpace( |
Wyatt Hepler | 30a5215 | 2020-02-12 11:26:05 -0800 | [diff] [blame] | 454 | §or, Entry::size(partition_.alignment_bytes(), key, value))); |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 455 | DBG("Writing existing entry; found sector: %zu", SectorIndex(sector)); |
David Rogers | 3464d0a | 2020-02-07 11:45:46 -0800 | [diff] [blame] | 456 | |
| 457 | if (old_sector != SectorFromAddress(key_descriptor->address)) { |
| 458 | DBG("Sector for old entry (size %zu) was garbage collected. Old entry " |
| 459 | "relocated to sector %zu", |
| 460 | original_entry.size(), |
| 461 | SectorIndex(SectorFromAddress(key_descriptor->address))); |
| 462 | |
| 463 | old_sector = SectorFromAddress(key_descriptor->address); |
| 464 | } |
| 465 | |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 466 | TRY(AppendEntry(sector, key_descriptor, key, value, new_state)); |
| 467 | |
David Rogers | 3464d0a | 2020-02-07 11:45:46 -0800 | [diff] [blame] | 468 | old_sector->RemoveValidBytes(original_entry.size()); |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 469 | return Status::OK; |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 470 | } |
| 471 | |
| 472 | Status KeyValueStore::WriteEntryForNewKey(string_view key, |
| 473 | span<const byte> value) { |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 474 | if (key_descriptors_.full()) { |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 475 | WRN("KVS full: trying to store a new entry, but can't. Have %zu entries", |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 476 | key_descriptors_.size()); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 477 | return Status::RESOURCE_EXHAUSTED; |
| 478 | } |
| 479 | |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 480 | // Create the KeyDescriptor that will be added to the list. The version and |
| 481 | // address will be set by AppendEntry. |
| 482 | KeyDescriptor key_descriptor(key, 0, 0); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 483 | |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 484 | SectorDescriptor* sector; |
Wyatt Hepler | 97fc794 | 2020-02-06 15:55:45 -0800 | [diff] [blame] | 485 | TRY(FindOrRecoverSectorWithSpace( |
Wyatt Hepler | 30a5215 | 2020-02-12 11:26:05 -0800 | [diff] [blame] | 486 | §or, Entry::size(partition_.alignment_bytes(), key, value))); |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 487 | DBG("Writing new entry; found sector: %zu", SectorIndex(sector)); |
Wyatt Hepler | 0af6ad9 | 2020-02-13 15:54:46 -0800 | [diff] [blame] | 488 | TRY(AppendEntry(sector, &key_descriptor, key, value, KeyDescriptor::kValid)); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 489 | |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 490 | // Only add the entry when we are certain the write succeeded. |
| 491 | key_descriptors_.push_back(key_descriptor); |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 492 | return Status::OK; |
| 493 | } |
| 494 | |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 495 | Status KeyValueStore::RelocateEntry(KeyDescriptor& key_descriptor) { |
David Rogers | f0a3544 | 2020-02-04 12:16:38 -0800 | [diff] [blame] | 496 | struct TempEntry { |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 497 | Entry::KeyBuffer key; |
David Rogers | f0a3544 | 2020-02-04 12:16:38 -0800 | [diff] [blame] | 498 | std::array<char, sizeof(working_buffer_) - sizeof(key)> value; |
| 499 | }; |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 500 | TempEntry* temp_entry = reinterpret_cast<TempEntry*>(working_buffer_.data()); |
David Rogers | f0a3544 | 2020-02-04 12:16:38 -0800 | [diff] [blame] | 501 | |
David Rogers | df025cd | 2020-02-06 17:05:34 -0800 | [diff] [blame] | 502 | DBG("Relocating entry"); // TODO: add entry info to the log statement. |
| 503 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 504 | // Read the entry to be relocated. Store the entry in a local variable and |
David Rogers | f0a3544 | 2020-02-04 12:16:38 -0800 | [diff] [blame] | 505 | // store the key and value in the TempEntry stored in the static allocated |
| 506 | // working_buffer_. |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 507 | Entry entry; |
| 508 | TRY(Entry::Read(partition_, key_descriptor.address, &entry)); |
| 509 | TRY_ASSIGN(size_t key_length, entry.ReadKey(temp_entry->key)); |
| 510 | string_view key = string_view(temp_entry->key.data(), key_length); |
| 511 | auto result = entry.ReadValue(as_writable_bytes(span(temp_entry->value))); |
David Rogers | f0a3544 | 2020-02-04 12:16:38 -0800 | [diff] [blame] | 512 | if (!result.status().ok()) { |
| 513 | return Status::INTERNAL; |
| 514 | } |
| 515 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 516 | auto value = span(temp_entry->value.data(), result.size()); |
| 517 | TRY(entry.VerifyChecksum( |
David Rogers | f0a3544 | 2020-02-04 12:16:38 -0800 | [diff] [blame] | 518 | entry_header_format_.checksum, key, as_bytes(value))); |
| 519 | |
David Rogers | 3464d0a | 2020-02-07 11:45:46 -0800 | [diff] [blame] | 520 | SectorDescriptor* old_sector = SectorFromAddress(key_descriptor.address); |
David Rogers | f0a3544 | 2020-02-04 12:16:38 -0800 | [diff] [blame] | 521 | |
| 522 | // Find a new sector for the entry and write it to the new location. |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 523 | SectorDescriptor* new_sector; |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 524 | TRY(FindSectorWithSpace(&new_sector, entry.size(), old_sector, true)); |
Wyatt Hepler | 0af6ad9 | 2020-02-13 15:54:46 -0800 | [diff] [blame] | 525 | TRY(AppendEntry( |
| 526 | new_sector, &key_descriptor, key, as_bytes(value), key_descriptor.state)); |
David Rogers | df025cd | 2020-02-06 17:05:34 -0800 | [diff] [blame] | 527 | |
| 528 | // Do the valid bytes accounting for the sector the entry was relocated out |
| 529 | // of. |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 530 | old_sector->RemoveValidBytes(entry.size()); |
David Rogers | df025cd | 2020-02-06 17:05:34 -0800 | [diff] [blame] | 531 | |
| 532 | return Status::OK; |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 533 | } |
| 534 | |
David Rogers | 8db5a72 | 2020-02-03 18:28:34 -0800 | [diff] [blame] | 535 | // Find either an existing sector with enough space that is not the sector to |
| 536 | // skip, or an empty sector. Maintains the invariant that there is always at |
| 537 | // least 1 empty sector unless set to bypass the rule. |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 538 | Status KeyValueStore::FindSectorWithSpace( |
| 539 | SectorDescriptor** found_sector, |
| 540 | size_t size, |
| 541 | const SectorDescriptor* sector_to_skip, |
| 542 | bool bypass_empty_sector_rule) { |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 543 | // The last_new_sector_ is the sector that was last selected as the "new empty |
| 544 | // sector" to write to. This last new sector is used as the starting point for |
| 545 | // the next "find a new empty sector to write to" operation. By using the last |
| 546 | // new sector as the start point we will cycle which empty sector is selected |
| 547 | // next, spreading the wear across all the empty sectors and get a wear |
| 548 | // leveling benefit, rather than putting more wear on the lower number |
| 549 | // sectors. |
| 550 | // |
| 551 | // Locally use the sector index for ease of iterating through the sectors. For |
| 552 | // the persistent storage use SectorDescriptor* rather than sector index |
| 553 | // because SectorDescriptor* is the standard way to identify a sector. |
| 554 | size_t last_new_sector_index_ = SectorIndex(last_new_sector_); |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 555 | size_t start = (last_new_sector_index_ + 1) % sectors_.size(); |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 556 | SectorDescriptor* first_empty_sector = nullptr; |
David Rogers | 8db5a72 | 2020-02-03 18:28:34 -0800 | [diff] [blame] | 557 | bool at_least_two_empty_sectors = bypass_empty_sector_rule; |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 558 | |
David Rogers | 67f4b6c | 2020-02-06 16:17:09 -0800 | [diff] [blame] | 559 | DBG("Find sector with %zu bytes available", size); |
| 560 | if (sector_to_skip != nullptr) { |
| 561 | DBG(" Skip sector %zu", SectorIndex(sector_to_skip)); |
| 562 | } |
| 563 | if (bypass_empty_sector_rule) { |
| 564 | DBG(" Bypassing empty sector rule"); |
| 565 | } |
| 566 | |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 567 | // Look for a partial sector to use with enough space. Immediately use the |
| 568 | // first one of those that is found. While scanning for a partial sector, keep |
| 569 | // track of the first empty sector and if a second sector was seen. |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 570 | for (size_t j = 0; j < sectors_.size(); j++) { |
| 571 | size_t i = (j + start) % sectors_.size(); |
| 572 | SectorDescriptor& sector = sectors_[i]; |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 573 | |
David Rogers | 8db5a72 | 2020-02-03 18:28:34 -0800 | [diff] [blame] | 574 | if (sector_to_skip == §or) { |
David Rogers | 67f4b6c | 2020-02-06 16:17:09 -0800 | [diff] [blame] | 575 | DBG(" Skipping the skip sector %zu", i); |
David Rogers | 8db5a72 | 2020-02-03 18:28:34 -0800 | [diff] [blame] | 576 | continue; |
| 577 | } |
| 578 | |
David Rogers | 67f4b6c | 2020-02-06 16:17:09 -0800 | [diff] [blame] | 579 | DBG(" Examining sector %zu with %hu bytes available", |
| 580 | i, |
| 581 | sector.tail_free_bytes); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 582 | if (!SectorEmpty(sector) && sector.HasSpace(size)) { |
David Rogers | 67f4b6c | 2020-02-06 16:17:09 -0800 | [diff] [blame] | 583 | DBG(" Partially occupied sector %zu with enough space; done!", i); |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 584 | *found_sector = §or; |
| 585 | return Status::OK; |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | if (SectorEmpty(sector)) { |
| 589 | if (first_empty_sector == nullptr) { |
| 590 | first_empty_sector = §or; |
| 591 | } else { |
| 592 | at_least_two_empty_sectors = true; |
Wyatt Hepler | 2ad6067 | 2020-01-21 08:00:16 -0800 | [diff] [blame] | 593 | } |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 594 | } |
| 595 | } |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 596 | |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 597 | // If the scan for a partial sector does not find a suitable sector, use the |
| 598 | // first empty sector that was found. Normally it is required to keep 1 empty |
| 599 | // sector after the sector found here, but that rule can be bypassed in |
| 600 | // special circumstances (such as during garbage collection). |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 601 | if (at_least_two_empty_sectors) { |
David Rogers | 67f4b6c | 2020-02-06 16:17:09 -0800 | [diff] [blame] | 602 | DBG(" Found a usable empty sector; returning the first found (%zu)", |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 603 | SectorIndex(first_empty_sector)); |
| 604 | last_new_sector_ = first_empty_sector; |
| 605 | *found_sector = first_empty_sector; |
| 606 | return Status::OK; |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 607 | } |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 608 | |
| 609 | // No sector was found. |
David Rogers | 67f4b6c | 2020-02-06 16:17:09 -0800 | [diff] [blame] | 610 | DBG(" Unable to find a usable sector"); |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 611 | *found_sector = nullptr; |
| 612 | return Status::RESOURCE_EXHAUSTED; |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 613 | } |
| 614 | |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 615 | Status KeyValueStore::FindOrRecoverSectorWithSpace(SectorDescriptor** sector, |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 616 | size_t size) { |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 617 | Status result = FindSectorWithSpace(sector, size); |
Wyatt Hepler | 2d40169 | 2020-02-13 16:01:23 -0800 | [diff] [blame] | 618 | if (result == Status::RESOURCE_EXHAUSTED && options_.partial_gc_on_write) { |
David Rogers | 1541d61 | 2020-02-06 23:47:02 -0800 | [diff] [blame] | 619 | // Garbage collect and then try again to find the best sector. |
| 620 | TRY(GarbageCollectOneSector()); |
| 621 | return FindSectorWithSpace(sector, size); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 622 | } |
David Rogers | 8ce55cd | 2020-02-04 19:41:48 -0800 | [diff] [blame] | 623 | return result; |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 624 | } |
| 625 | |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 626 | KeyValueStore::SectorDescriptor* KeyValueStore::FindSectorToGarbageCollect() { |
| 627 | SectorDescriptor* sector_candidate = nullptr; |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 628 | size_t candidate_bytes = 0; |
| 629 | |
| 630 | // Step 1: Try to find a sectors with stale keys and no valid keys (no |
| 631 | // relocation needed). If any such sectors are found, use the sector with the |
| 632 | // most reclaimable bytes. |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 633 | for (auto& sector : sectors_) { |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 634 | if ((sector.valid_bytes == 0) && |
| 635 | (RecoverableBytes(sector) > candidate_bytes)) { |
| 636 | sector_candidate = §or; |
| 637 | candidate_bytes = RecoverableBytes(sector); |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | // Step 2: If step 1 yields no sectors, just find the sector with the most |
| 642 | // reclaimable bytes. |
| 643 | if (sector_candidate == nullptr) { |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 644 | for (auto& sector : sectors_) { |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 645 | if (RecoverableBytes(sector) > candidate_bytes) { |
| 646 | sector_candidate = §or; |
| 647 | candidate_bytes = RecoverableBytes(sector); |
| 648 | } |
| 649 | } |
| 650 | } |
| 651 | |
David Rogers | 5981f31 | 2020-02-13 13:33:56 -0800 | [diff] [blame] | 652 | if (sector_candidate != nullptr) { |
| 653 | DBG("Found sector %zu to Garbage Collect, %zu recoverable bytes", |
| 654 | SectorIndex(sector_candidate), |
| 655 | RecoverableBytes(*sector_candidate)); |
| 656 | } else { |
| 657 | DBG("Unable to find sector to garbage collect!"); |
| 658 | } |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 659 | return sector_candidate; |
| 660 | } |
| 661 | |
David Rogers | 1541d61 | 2020-02-06 23:47:02 -0800 | [diff] [blame] | 662 | Status KeyValueStore::GarbageCollectOneSector() { |
David Rogers | 67f4b6c | 2020-02-06 16:17:09 -0800 | [diff] [blame] | 663 | DBG("Garbage Collect a single sector"); |
| 664 | |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 665 | // Step 1: Find the sector to garbage collect |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 666 | SectorDescriptor* sector_to_gc = FindSectorToGarbageCollect(); |
David Rogers | 3464d0a | 2020-02-07 11:45:46 -0800 | [diff] [blame] | 667 | LogSectors(); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 668 | |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 669 | if (sector_to_gc == nullptr) { |
| 670 | return Status::RESOURCE_EXHAUSTED; |
| 671 | } |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 672 | |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 673 | // Step 2: Move any valid entries in the GC sector to other sectors |
| 674 | if (sector_to_gc->valid_bytes != 0) { |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 675 | for (auto& descriptor : key_descriptors_) { |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 676 | if (AddressInSector(*sector_to_gc, descriptor.address)) { |
David Rogers | 67f4b6c | 2020-02-06 16:17:09 -0800 | [diff] [blame] | 677 | DBG(" Relocate entry"); |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 678 | TRY(RelocateEntry(descriptor)); |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 679 | } |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 680 | } |
| 681 | } |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 682 | |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 683 | if (sector_to_gc->valid_bytes != 0) { |
David Rogers | 67f4b6c | 2020-02-06 16:17:09 -0800 | [diff] [blame] | 684 | ERR(" Failed to relocate valid entries from sector being garbage " |
| 685 | "collected, %hu valid bytes remain", |
| 686 | sector_to_gc->valid_bytes); |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 687 | return Status::INTERNAL; |
| 688 | } |
| 689 | |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 690 | // Step 3: Reinitialize the sector |
| 691 | sector_to_gc->tail_free_bytes = 0; |
| 692 | TRY(partition_.Erase(SectorBaseAddress(sector_to_gc), 1)); |
| 693 | sector_to_gc->tail_free_bytes = partition_.sector_size_bytes(); |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 694 | |
David Rogers | 67f4b6c | 2020-02-06 16:17:09 -0800 | [diff] [blame] | 695 | DBG(" Garbage Collect complete"); |
David Rogers | 50185ad | 2020-02-07 00:02:46 -0800 | [diff] [blame] | 696 | LogSectors(); |
David Rogers | a12786b | 2020-01-31 16:02:33 -0800 | [diff] [blame] | 697 | return Status::OK; |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 698 | } |
| 699 | |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 700 | Status KeyValueStore::AppendEntry(SectorDescriptor* sector, |
| 701 | KeyDescriptor* key_descriptor, |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 702 | const string_view key, |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 703 | span<const byte> value, |
| 704 | KeyDescriptor::State new_state) { |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 705 | const Address address = NextWritableAddress(sector); |
| 706 | DBG("Appending to address: %#zx", size_t(address)); |
| 707 | |
| 708 | Entry entry; |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 709 | |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 710 | if (new_state == KeyDescriptor::kDeleted) { |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 711 | entry = Entry::Tombstone(partition_, |
| 712 | address, |
| 713 | entry_header_format_.magic, |
| 714 | entry_header_format_.checksum, |
| 715 | key, |
| 716 | partition_.alignment_bytes(), |
| 717 | key_descriptor->key_version + 1); |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 718 | } else { |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 719 | entry = Entry::Valid(partition_, |
| 720 | address, |
| 721 | entry_header_format_.magic, |
| 722 | entry_header_format_.checksum, |
| 723 | key, |
| 724 | value, |
| 725 | partition_.alignment_bytes(), |
| 726 | key_descriptor->key_version + 1); |
Wyatt Hepler | 6c24c06 | 2020-02-05 15:30:49 -0800 | [diff] [blame] | 727 | } |
| 728 | |
Wyatt Hepler | 97fc794 | 2020-02-06 15:55:45 -0800 | [diff] [blame] | 729 | DBG("Appending %zu B entry with key version: %x", |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 730 | entry.size(), |
| 731 | unsigned(entry.key_version())); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 732 | |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 733 | TRY_ASSIGN(const size_t written, entry.Write(key, value)); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 734 | |
| 735 | if (options_.verify_on_write) { |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 736 | TRY(entry.VerifyChecksumInFlash(entry_header_format_.checksum)); |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 737 | } |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 738 | |
David Rogers | 2761aeb | 2020-01-31 17:09:00 -0800 | [diff] [blame] | 739 | key_descriptor->address = address; |
Wyatt Hepler | e541e07 | 2020-02-14 09:10:53 -0800 | [diff] [blame] | 740 | key_descriptor->key_version = entry.key_version(); |
Wyatt Hepler | 5a33d8c | 2020-02-06 09:32:58 -0800 | [diff] [blame] | 741 | key_descriptor->state = new_state; |
| 742 | |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 743 | sector->valid_bytes += written; |
David Rogers | 2be76b0 | 2020-02-06 17:33:05 -0800 | [diff] [blame] | 744 | sector->RemoveFreeBytes(written); |
Wyatt Hepler | 4da1fcb | 2020-01-30 17:32:18 -0800 | [diff] [blame] | 745 | return Status::OK; |
Wyatt Hepler | b760954 | 2020-01-24 10:29:54 -0800 | [diff] [blame] | 746 | } |
| 747 | |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 748 | void KeyValueStore::LogDebugInfo() { |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 749 | const size_t sector_size_bytes = partition_.sector_size_bytes(); |
| 750 | DBG("====================== KEY VALUE STORE DUMP ========================="); |
| 751 | DBG(" "); |
| 752 | DBG("Flash partition:"); |
Wyatt Hepler | ad0a793 | 2020-02-06 08:20:38 -0800 | [diff] [blame] | 753 | DBG(" Sector count = %zu", partition_.sector_count()); |
| 754 | DBG(" Sector max count = %zu", kMaxUsableSectors); |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 755 | DBG(" Sectors in use = %zu", sectors_.size()); |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 756 | DBG(" Sector size = %zu", sector_size_bytes); |
| 757 | DBG(" Total size = %zu", partition_.size_bytes()); |
| 758 | DBG(" Alignment = %zu", partition_.alignment_bytes()); |
| 759 | DBG(" "); |
| 760 | DBG("Key descriptors:"); |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 761 | DBG(" Entry count = %zu", key_descriptors_.size()); |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 762 | DBG(" Max entry count = %zu", kMaxEntries); |
| 763 | DBG(" "); |
| 764 | DBG(" # hash version address address (hex)"); |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 765 | for (size_t i = 0; i < key_descriptors_.size(); ++i) { |
| 766 | const KeyDescriptor& kd = key_descriptors_[i]; |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 767 | DBG(" |%3zu: | %8zx |%8zu | %8zu | %8zx", |
| 768 | i, |
| 769 | size_t(kd.key_hash), |
| 770 | size_t(kd.key_version), |
| 771 | size_t(kd.address), |
| 772 | size_t(kd.address)); |
| 773 | } |
| 774 | DBG(" "); |
| 775 | |
| 776 | DBG("Sector descriptors:"); |
| 777 | DBG(" # tail free valid has_space"); |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 778 | for (size_t sector_id = 0; sector_id < sectors_.size(); ++sector_id) { |
| 779 | const SectorDescriptor& sd = sectors_[sector_id]; |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 780 | DBG(" |%3zu: | %8zu |%8zu | %s", |
| 781 | sector_id, |
| 782 | size_t(sd.tail_free_bytes), |
| 783 | size_t(sd.valid_bytes), |
| 784 | sd.tail_free_bytes ? "YES" : ""); |
| 785 | } |
| 786 | DBG(" "); |
| 787 | |
| 788 | // TODO: This should stop logging after some threshold. |
| 789 | // size_t dumped_bytes = 0; |
| 790 | DBG("Sector raw data:"); |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 791 | for (size_t sector_id = 0; sector_id < sectors_.size(); ++sector_id) { |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 792 | // Read sector data. Yes, this will blow the stack on embedded. |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 793 | std::array<byte, 500> raw_sector_data; // TODO!!! |
Keir Mierle | 8c352dc | 2020-02-02 13:58:19 -0800 | [diff] [blame] | 794 | StatusWithSize sws = |
| 795 | partition_.Read(sector_id * sector_size_bytes, raw_sector_data); |
| 796 | DBG("Read: %zu bytes", sws.size()); |
| 797 | |
| 798 | DBG(" base addr offs 0 1 2 3 4 5 6 7"); |
| 799 | for (size_t i = 0; i < sector_size_bytes; i += 8) { |
| 800 | DBG(" %3zu %8zx %5zu | %02x %02x %02x %02x %02x %02x %02x %02x", |
| 801 | sector_id, |
| 802 | (sector_id * sector_size_bytes) + i, |
| 803 | i, |
| 804 | static_cast<unsigned int>(raw_sector_data[i + 0]), |
| 805 | static_cast<unsigned int>(raw_sector_data[i + 1]), |
| 806 | static_cast<unsigned int>(raw_sector_data[i + 2]), |
| 807 | static_cast<unsigned int>(raw_sector_data[i + 3]), |
| 808 | static_cast<unsigned int>(raw_sector_data[i + 4]), |
| 809 | static_cast<unsigned int>(raw_sector_data[i + 5]), |
| 810 | static_cast<unsigned int>(raw_sector_data[i + 6]), |
| 811 | static_cast<unsigned int>(raw_sector_data[i + 7])); |
| 812 | |
| 813 | // TODO: Fix exit condition. |
| 814 | if (i > 128) { |
| 815 | break; |
| 816 | } |
| 817 | } |
| 818 | DBG(" "); |
| 819 | } |
| 820 | |
| 821 | DBG("////////////////////// KEY VALUE STORE DUMP END /////////////////////"); |
| 822 | } |
| 823 | |
David Rogers | cf680ab | 2020-02-12 23:28:32 -0800 | [diff] [blame] | 824 | void KeyValueStore::LogSectors() const { |
| 825 | DBG("Sector descriptors: count %zu", sectors_.size()); |
Wyatt Hepler | 1c329ca | 2020-02-07 18:07:23 -0800 | [diff] [blame] | 826 | for (auto& sector : sectors_) { |
David Rogers | 50185ad | 2020-02-07 00:02:46 -0800 | [diff] [blame] | 827 | DBG(" - Sector %zu: valid %hu, recoverable %zu, free %hu", |
| 828 | SectorIndex(§or), |
| 829 | sector.valid_bytes, |
| 830 | RecoverableBytes(sector), |
| 831 | sector.tail_free_bytes); |
| 832 | } |
| 833 | } |
| 834 | |
David Rogers | cf680ab | 2020-02-12 23:28:32 -0800 | [diff] [blame] | 835 | void KeyValueStore::LogKeyDescriptor() const { |
| 836 | DBG("Key descriptors: count %zu", key_descriptors_.size()); |
| 837 | for (auto& key : key_descriptors_) { |
| 838 | DBG(" - Key: %s, hash %#zx, version %zu, address %#zx", |
| 839 | key.deleted() ? "Deleted" : "Valid", |
| 840 | static_cast<size_t>(key.key_hash), |
| 841 | static_cast<size_t>(key.key_version), |
| 842 | static_cast<size_t>(key.address)); |
| 843 | } |
| 844 | } |
| 845 | |
David Rogers | 3464d0a | 2020-02-07 11:45:46 -0800 | [diff] [blame] | 846 | void KeyValueStore::SectorDescriptor::RemoveValidBytes(size_t size) { |
| 847 | // TODO: add safety check for valid_bytes > size. |
| 848 | if (size > valid_bytes) { |
| 849 | CRT("!!!!!!!!!!!!!!!"); |
| 850 | CRT("Remove too many valid bytes!!! remove %zu, only have %hu", |
| 851 | size, |
| 852 | valid_bytes); |
| 853 | valid_bytes = size; |
| 854 | } |
| 855 | valid_bytes -= size; |
| 856 | } |
| 857 | |
Wyatt Hepler | 2ad6067 | 2020-01-21 08:00:16 -0800 | [diff] [blame] | 858 | } // namespace pw::kvs |