1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (c) Intel Corporation. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #ifndef SPDK_BLOBSTORE_H 35 #define SPDK_BLOBSTORE_H 36 37 #include "spdk/assert.h" 38 #include "spdk/blob.h" 39 #include "spdk/queue.h" 40 #include "spdk/util.h" 41 42 #include "request.h" 43 44 /* In Memory Data Structures 45 * 46 * The following data structures exist only in memory. 47 */ 48 49 #define SPDK_BLOB_OPTS_CLUSTER_SZ (1024 * 1024) 50 #define SPDK_BLOB_OPTS_NUM_MD_PAGES UINT32_MAX 51 #define SPDK_BLOB_OPTS_MAX_MD_OPS 32 52 #define SPDK_BLOB_OPTS_DEFAULT_CHANNEL_OPS 512 53 #define SPDK_BLOB_BLOBID_HIGH_BIT (1ULL << 32) 54 55 struct spdk_xattr { 56 /* TODO: reorder for best packing */ 57 uint32_t index; 58 char *name; 59 void *value; 60 uint16_t value_len; 61 TAILQ_ENTRY(spdk_xattr) link; 62 }; 63 64 /* The mutable part of the blob data that is sync'd to 65 * disk. The data in here is both mutable and persistent. 66 */ 67 struct spdk_blob_mut_data { 68 /* Number of data clusters in the blob */ 69 uint64_t num_clusters; 70 71 /* Array LBAs that are the beginning of a cluster, in 72 * the order they appear in the blob. 73 */ 74 uint64_t *clusters; 75 76 /* The size of the clusters array. This is greater than or 77 * equal to 'num_clusters'. 78 */ 79 size_t cluster_array_size; 80 81 /* Number of metadata pages */ 82 uint32_t num_pages; 83 84 /* Array of page offsets into the metadata region, in 85 * the order of the metadata page sequence. 86 */ 87 uint32_t *pages; 88 }; 89 90 enum spdk_blob_state { 91 /* The blob in-memory version does not match the on-disk 92 * version. 93 */ 94 SPDK_BLOB_STATE_DIRTY, 95 96 /* The blob in memory version of the blob matches the on disk 97 * version. 98 */ 99 SPDK_BLOB_STATE_CLEAN, 100 101 /* The in-memory state being synchronized with the on-disk 102 * blob state. */ 103 SPDK_BLOB_STATE_LOADING, 104 105 /* The disk state is being synchronized with the current 106 * blob state. 107 */ 108 SPDK_BLOB_STATE_SYNCING, 109 }; 110 111 struct spdk_blob_data { 112 struct spdk_blob_store *bs; 113 114 uint32_t open_ref; 115 116 spdk_blob_id id; 117 118 enum spdk_blob_state state; 119 120 /* Two copies of the mutable data. One is a version 121 * that matches the last known data on disk (clean). 122 * The other (active) is the current data. Syncing 123 * a blob makes the clean match the active. 124 */ 125 struct spdk_blob_mut_data clean; 126 struct spdk_blob_mut_data active; 127 128 bool invalid; 129 bool data_ro; 130 bool md_ro; 131 132 uint64_t invalid_flags; 133 uint64_t data_ro_flags; 134 uint64_t md_ro_flags; 135 136 /* TODO: The xattrs are mutable, but we don't want to be 137 * copying them unecessarily. Figure this out. 138 */ 139 TAILQ_HEAD(, spdk_xattr) xattrs; 140 141 TAILQ_ENTRY(spdk_blob_data) link; 142 }; 143 144 #define __blob_to_data(x) ((struct spdk_blob_data *)(x)) 145 #define __data_to_blob(x) ((struct spdk_blob *)(x)) 146 147 struct spdk_blob_store { 148 uint64_t md_start; /* Offset from beginning of disk, in pages */ 149 uint32_t md_len; /* Count, in pages */ 150 151 struct spdk_io_channel *md_channel; 152 uint32_t max_channel_ops; 153 154 struct spdk_bs_dev *dev; 155 156 struct spdk_bit_array *used_md_pages; 157 struct spdk_bit_array *used_clusters; 158 struct spdk_bit_array *used_blobids; 159 160 uint32_t cluster_sz; 161 uint64_t total_clusters; 162 uint64_t total_data_clusters; 163 uint64_t num_free_clusters; 164 uint32_t pages_per_cluster; 165 166 spdk_blob_id super_blob; 167 struct spdk_bs_type bstype; 168 169 struct spdk_bs_cpl unload_cpl; 170 int unload_err; 171 172 TAILQ_HEAD(, spdk_blob_data) blobs; 173 }; 174 175 struct spdk_bs_channel { 176 struct spdk_bs_request_set *req_mem; 177 TAILQ_HEAD(, spdk_bs_request_set) reqs; 178 179 struct spdk_blob_store *bs; 180 181 struct spdk_bs_dev *dev; 182 struct spdk_io_channel *dev_channel; 183 }; 184 185 /** operation type */ 186 enum spdk_blob_op_type { 187 SPDK_BLOB_WRITE, 188 SPDK_BLOB_READ, 189 SPDK_BLOB_UNMAP, 190 SPDK_BLOB_WRITE_ZEROES, 191 }; 192 193 /* On-Disk Data Structures 194 * 195 * The following data structures exist on disk. 196 */ 197 #define SPDK_BS_INITIAL_VERSION 1 198 #define SPDK_BS_VERSION 3 /* current version */ 199 200 #pragma pack(push, 1) 201 202 #define SPDK_MD_MASK_TYPE_USED_PAGES 0 203 #define SPDK_MD_MASK_TYPE_USED_CLUSTERS 1 204 #define SPDK_MD_MASK_TYPE_USED_BLOBIDS 2 205 206 struct spdk_bs_md_mask { 207 uint8_t type; 208 uint32_t length; /* In bits */ 209 uint8_t mask[0]; 210 }; 211 212 #define SPDK_MD_DESCRIPTOR_TYPE_PADDING 0 213 #define SPDK_MD_DESCRIPTOR_TYPE_EXTENT 1 214 #define SPDK_MD_DESCRIPTOR_TYPE_XATTR 2 215 #define SPDK_MD_DESCRIPTOR_TYPE_FLAGS 3 216 217 struct spdk_blob_md_descriptor_xattr { 218 uint8_t type; 219 uint32_t length; 220 221 uint16_t name_length; 222 uint16_t value_length; 223 224 char name[0]; 225 /* String name immediately followed by string value. */ 226 }; 227 228 struct spdk_blob_md_descriptor_extent { 229 uint8_t type; 230 uint32_t length; 231 232 struct { 233 uint32_t cluster_idx; 234 uint32_t length; /* In units of clusters */ 235 } extents[0]; 236 }; 237 238 #define SPDK_BLOB_THIN_PROV (1ULL << 0) 239 #define SPDK_BLOB_INVALID_FLAGS_MASK SPDK_BLOB_THIN_PROV 240 241 #define SPDK_BLOB_READ_ONLY (1ULL << 0) 242 #define SPDK_BLOB_DATA_RO_FLAGS_MASK SPDK_BLOB_READ_ONLY 243 #define SPDK_BLOB_MD_RO_FLAGS_MASK 0 244 245 #define spdk_blob_is_thin_provisioned(blob) (blob->invalid_flags & SPDK_BLOB_THIN_PROV) 246 247 struct spdk_blob_md_descriptor_flags { 248 uint8_t type; 249 uint32_t length; 250 251 /* 252 * If a flag in invalid_flags is set that the application is not aware of, 253 * it will not allow the blob to be opened. 254 */ 255 uint64_t invalid_flags; 256 257 /* 258 * If a flag in data_ro_flags is set that the application is not aware of, 259 * allow the blob to be opened in data_read_only and md_read_only mode. 260 */ 261 uint64_t data_ro_flags; 262 263 /* 264 * If a flag in md_ro_flags is set the the application is not aware of, 265 * allow the blob to be opened in md_read_only mode. 266 */ 267 uint64_t md_ro_flags; 268 }; 269 270 struct spdk_blob_md_descriptor { 271 uint8_t type; 272 uint32_t length; 273 }; 274 275 #define SPDK_INVALID_MD_PAGE UINT32_MAX 276 277 struct spdk_blob_md_page { 278 spdk_blob_id id; 279 280 uint32_t sequence_num; 281 uint32_t reserved0; 282 283 /* Descriptors here */ 284 uint8_t descriptors[4072]; 285 286 uint32_t next; 287 uint32_t crc; 288 }; 289 #define SPDK_BS_PAGE_SIZE 0x1000 290 SPDK_STATIC_ASSERT(SPDK_BS_PAGE_SIZE == sizeof(struct spdk_blob_md_page), "Invalid md page size"); 291 292 #define SPDK_BS_SUPER_BLOCK_SIG "SPDKBLOB" 293 294 struct spdk_bs_super_block { 295 uint8_t signature[8]; 296 uint32_t version; 297 uint32_t length; 298 uint32_t clean; /* If there was a clean shutdown, this is 1. */ 299 spdk_blob_id super_blob; 300 301 uint32_t cluster_size; /* In bytes */ 302 303 uint32_t used_page_mask_start; /* Offset from beginning of disk, in pages */ 304 uint32_t used_page_mask_len; /* Count, in pages */ 305 306 uint32_t used_cluster_mask_start; /* Offset from beginning of disk, in pages */ 307 uint32_t used_cluster_mask_len; /* Count, in pages */ 308 309 uint32_t md_start; /* Offset from beginning of disk, in pages */ 310 uint32_t md_len; /* Count, in pages */ 311 312 struct spdk_bs_type bstype; /* blobstore type */ 313 314 uint32_t used_blobid_mask_start; /* Offset from beginning of disk, in pages */ 315 uint32_t used_blobid_mask_len; /* Count, in pages */ 316 317 uint8_t reserved[4012]; 318 uint32_t crc; 319 }; 320 SPDK_STATIC_ASSERT(sizeof(struct spdk_bs_super_block) == 0x1000, "Invalid super block size"); 321 322 #pragma pack(pop) 323 324 /* Unit Conversions 325 * 326 * The blobstore works with several different units: 327 * - Byte: Self explanatory 328 * - LBA: The logical blocks on the backing storage device. 329 * - Page: The read/write units of blobs and metadata. This is 330 * an offset into a blob in units of 4KiB. 331 * - Cluster Index: The disk is broken into a sequential list of 332 * clusters. This is the offset from the beginning. 333 * 334 * NOTE: These conversions all act on simple magnitudes, not with any sort 335 * of knowledge about the blobs themselves. For instance, converting 336 * a page to an lba with the conversion function below simply converts 337 * a number of pages to an equivalent number of lbas, but that 338 * lba certainly isn't the right lba that corresponds to a page offset 339 * for a particular blob. 340 */ 341 static inline uint64_t 342 _spdk_bs_byte_to_lba(struct spdk_blob_store *bs, uint64_t length) 343 { 344 assert(length % bs->dev->blocklen == 0); 345 346 return length / bs->dev->blocklen; 347 } 348 349 static inline uint64_t 350 _spdk_bs_lba_to_byte(struct spdk_blob_store *bs, uint64_t lba) 351 { 352 return lba * bs->dev->blocklen; 353 } 354 355 static inline uint64_t 356 _spdk_bs_page_to_lba(struct spdk_blob_store *bs, uint64_t page) 357 { 358 return page * SPDK_BS_PAGE_SIZE / bs->dev->blocklen; 359 } 360 361 static inline uint32_t 362 _spdk_bs_lba_to_page(struct spdk_blob_store *bs, uint64_t lba) 363 { 364 uint64_t lbas_per_page; 365 366 lbas_per_page = SPDK_BS_PAGE_SIZE / bs->dev->blocklen; 367 368 assert(lba % lbas_per_page == 0); 369 370 return lba / lbas_per_page; 371 } 372 373 static inline uint64_t 374 _spdk_bs_cluster_to_page(struct spdk_blob_store *bs, uint32_t cluster) 375 { 376 return cluster * bs->pages_per_cluster; 377 } 378 379 static inline uint32_t 380 _spdk_bs_page_to_cluster(struct spdk_blob_store *bs, uint64_t page) 381 { 382 assert(page % bs->pages_per_cluster == 0); 383 384 return page / bs->pages_per_cluster; 385 } 386 387 static inline uint64_t 388 _spdk_bs_cluster_to_lba(struct spdk_blob_store *bs, uint32_t cluster) 389 { 390 return cluster * (bs->cluster_sz / bs->dev->blocklen); 391 } 392 393 static inline uint32_t 394 _spdk_bs_lba_to_cluster(struct spdk_blob_store *bs, uint64_t lba) 395 { 396 assert(lba % (bs->cluster_sz / bs->dev->blocklen) == 0); 397 398 return lba / (bs->cluster_sz / bs->dev->blocklen); 399 } 400 401 /* End basic conversions */ 402 403 static inline uint32_t 404 _spdk_bs_blobid_to_page(spdk_blob_id id) 405 { 406 return id & 0xFFFFFFFF; 407 } 408 409 /* The blob id is a 64 bit number. The lower 32 bits are the page_idx. The upper 410 * 32 bits are not currently used. Stick a 1 there just to catch bugs where the 411 * code assumes blob id == page_idx. 412 */ 413 static inline spdk_blob_id 414 _spdk_bs_page_to_blobid(uint32_t page_idx) 415 { 416 return SPDK_BLOB_BLOBID_HIGH_BIT | page_idx; 417 } 418 419 /* Given a page offset into a blob, look up the LBA for the 420 * start of that page. 421 */ 422 static inline uint64_t 423 _spdk_bs_blob_page_to_lba(struct spdk_blob_data *blob, uint32_t page) 424 { 425 uint64_t lba; 426 uint32_t pages_per_cluster; 427 428 pages_per_cluster = blob->bs->pages_per_cluster; 429 430 assert(page < blob->active.num_clusters * pages_per_cluster); 431 432 lba = blob->active.clusters[page / pages_per_cluster]; 433 lba += _spdk_bs_page_to_lba(blob->bs, page % pages_per_cluster); 434 435 return lba; 436 } 437 438 /* Given a page offset into a blob, look up the number of pages until the 439 * next cluster boundary. 440 */ 441 static inline uint32_t 442 _spdk_bs_num_pages_to_cluster_boundary(struct spdk_blob_data *blob, uint32_t page) 443 { 444 uint32_t pages_per_cluster; 445 446 pages_per_cluster = blob->bs->pages_per_cluster; 447 448 return pages_per_cluster - (page % pages_per_cluster); 449 } 450 451 #endif 452