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 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2012 by Delphix. All rights reserved. 24 */ 25 26 /* Portions Copyright 2010 Robert Milkowski */ 27 28 #ifndef _SYS_ZIL_H 29 #define _SYS_ZIL_H 30 31 #include <sys/types.h> 32 #include <sys/spa.h> 33 #include <sys/zio.h> 34 #include <sys/dmu.h> 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 /* 41 * Intent log format: 42 * 43 * Each objset has its own intent log. The log header (zil_header_t) 44 * for objset N's intent log is kept in the Nth object of the SPA's 45 * intent_log objset. The log header points to a chain of log blocks, 46 * each of which contains log records (i.e., transactions) followed by 47 * a log block trailer (zil_trailer_t). The format of a log record 48 * depends on the record (or transaction) type, but all records begin 49 * with a common structure that defines the type, length, and txg. 50 */ 51 52 /* 53 * Intent log header - this on disk structure holds fields to manage 54 * the log. All fields are 64 bit to easily handle cross architectures. 55 */ 56 typedef struct zil_header { 57 uint64_t zh_claim_txg; /* txg in which log blocks were claimed */ 58 uint64_t zh_replay_seq; /* highest replayed sequence number */ 59 blkptr_t zh_log; /* log chain */ 60 uint64_t zh_claim_blk_seq; /* highest claimed block sequence number */ 61 uint64_t zh_flags; /* header flags */ 62 uint64_t zh_claim_lr_seq; /* highest claimed lr sequence number */ 63 uint64_t zh_pad[3]; 64 } zil_header_t; 65 66 /* 67 * zh_flags bit settings 68 */ 69 #define ZIL_REPLAY_NEEDED 0x1 /* replay needed - internal only */ 70 #define ZIL_CLAIM_LR_SEQ_VALID 0x2 /* zh_claim_lr_seq field is valid */ 71 72 /* 73 * Log block chaining. 74 * 75 * Log blocks are chained together. Originally they were chained at the 76 * end of the block. For performance reasons the chain was moved to the 77 * beginning of the block which allows writes for only the data being used. 78 * The older position is supported for backwards compatability. 79 * 80 * The zio_eck_t contains a zec_cksum which for the intent log is 81 * the sequence number of this log block. A seq of 0 is invalid. 82 * The zec_cksum is checked by the SPA against the sequence 83 * number passed in the blk_cksum field of the blkptr_t 84 */ 85 typedef struct zil_chain { 86 uint64_t zc_pad; 87 blkptr_t zc_next_blk; /* next block in chain */ 88 uint64_t zc_nused; /* bytes in log block used */ 89 zio_eck_t zc_eck; /* block trailer */ 90 } zil_chain_t; 91 92 #define ZIL_MIN_BLKSZ 4096ULL 93 #define ZIL_MAX_BLKSZ SPA_MAXBLOCKSIZE 94 95 /* 96 * The words of a log block checksum. 97 */ 98 #define ZIL_ZC_GUID_0 0 99 #define ZIL_ZC_GUID_1 1 100 #define ZIL_ZC_OBJSET 2 101 #define ZIL_ZC_SEQ 3 102 103 typedef enum zil_create { 104 Z_FILE, 105 Z_DIR, 106 Z_XATTRDIR, 107 } zil_create_t; 108 109 /* 110 * size of xvattr log section. 111 * its composed of lr_attr_t + xvattr bitmap + 2 64 bit timestamps 112 * for create time and a single 64 bit integer for all of the attributes, 113 * and 4 64 bit integers (32 bytes) for the scanstamp. 114 * 115 */ 116 117 #define ZIL_XVAT_SIZE(mapsize) \ 118 sizeof (lr_attr_t) + (sizeof (uint32_t) * (mapsize - 1)) + \ 119 (sizeof (uint64_t) * 7) 120 121 /* 122 * Size of ACL in log. The ACE data is padded out to properly align 123 * on 8 byte boundary. 124 */ 125 126 #define ZIL_ACE_LENGTH(x) (roundup(x, sizeof (uint64_t))) 127 128 /* 129 * Intent log transaction types and record structures 130 */ 131 #define TX_CREATE 1 /* Create file */ 132 #define TX_MKDIR 2 /* Make directory */ 133 #define TX_MKXATTR 3 /* Make XATTR directory */ 134 #define TX_SYMLINK 4 /* Create symbolic link to a file */ 135 #define TX_REMOVE 5 /* Remove file */ 136 #define TX_RMDIR 6 /* Remove directory */ 137 #define TX_LINK 7 /* Create hard link to a file */ 138 #define TX_RENAME 8 /* Rename a file */ 139 #define TX_WRITE 9 /* File write */ 140 #define TX_TRUNCATE 10 /* Truncate a file */ 141 #define TX_SETATTR 11 /* Set file attributes */ 142 #define TX_ACL_V0 12 /* Set old formatted ACL */ 143 #define TX_ACL 13 /* Set ACL */ 144 #define TX_CREATE_ACL 14 /* create with ACL */ 145 #define TX_CREATE_ATTR 15 /* create + attrs */ 146 #define TX_CREATE_ACL_ATTR 16 /* create with ACL + attrs */ 147 #define TX_MKDIR_ACL 17 /* mkdir with ACL */ 148 #define TX_MKDIR_ATTR 18 /* mkdir with attr */ 149 #define TX_MKDIR_ACL_ATTR 19 /* mkdir with ACL + attrs */ 150 #define TX_WRITE2 20 /* dmu_sync EALREADY write */ 151 #define TX_MAX_TYPE 21 /* Max transaction type */ 152 153 /* 154 * The transactions for mkdir, symlink, remove, rmdir, link, and rename 155 * may have the following bit set, indicating the original request 156 * specified case-insensitive handling of names. 157 */ 158 #define TX_CI ((uint64_t)0x1 << 63) /* case-insensitive behavior requested */ 159 160 /* 161 * Transactions for write, truncate, setattr, acl_v0, and acl can be logged 162 * out of order. For convenience in the code, all such records must have 163 * lr_foid at the same offset. 164 */ 165 #define TX_OOO(txtype) \ 166 ((txtype) == TX_WRITE || \ 167 (txtype) == TX_TRUNCATE || \ 168 (txtype) == TX_SETATTR || \ 169 (txtype) == TX_ACL_V0 || \ 170 (txtype) == TX_ACL || \ 171 (txtype) == TX_WRITE2) 172 173 /* 174 * Format of log records. 175 * The fields are carefully defined to allow them to be aligned 176 * and sized the same on sparc & intel architectures. 177 * Each log record has a common structure at the beginning. 178 * 179 * The log record on disk (lrc_seq) holds the sequence number of all log 180 * records which is used to ensure we don't replay the same record. 181 */ 182 typedef struct { /* common log record header */ 183 uint64_t lrc_txtype; /* intent log transaction type */ 184 uint64_t lrc_reclen; /* transaction record length */ 185 uint64_t lrc_txg; /* dmu transaction group number */ 186 uint64_t lrc_seq; /* see comment above */ 187 } lr_t; 188 189 /* 190 * Common start of all out-of-order record types (TX_OOO() above). 191 */ 192 typedef struct { 193 lr_t lr_common; /* common portion of log record */ 194 uint64_t lr_foid; /* object id */ 195 } lr_ooo_t; 196 197 /* 198 * Handle option extended vattr attributes. 199 * 200 * Whenever new attributes are added the version number 201 * will need to be updated as will code in 202 * zfs_log.c and zfs_replay.c 203 */ 204 typedef struct { 205 uint32_t lr_attr_masksize; /* number of elements in array */ 206 uint32_t lr_attr_bitmap; /* First entry of array */ 207 /* remainder of array and any additional fields */ 208 } lr_attr_t; 209 210 /* 211 * log record for creates without optional ACL. 212 * This log record does support optional xvattr_t attributes. 213 */ 214 typedef struct { 215 lr_t lr_common; /* common portion of log record */ 216 uint64_t lr_doid; /* object id of directory */ 217 uint64_t lr_foid; /* object id of created file object */ 218 uint64_t lr_mode; /* mode of object */ 219 uint64_t lr_uid; /* uid of object */ 220 uint64_t lr_gid; /* gid of object */ 221 uint64_t lr_gen; /* generation (txg of creation) */ 222 uint64_t lr_crtime[2]; /* creation time */ 223 uint64_t lr_rdev; /* rdev of object to create */ 224 /* name of object to create follows this */ 225 /* for symlinks, link content follows name */ 226 /* for creates with xvattr data, the name follows the xvattr info */ 227 } lr_create_t; 228 229 /* 230 * FUID ACL record will be an array of ACEs from the original ACL. 231 * If this array includes ephemeral IDs, the record will also include 232 * an array of log-specific FUIDs to replace the ephemeral IDs. 233 * Only one copy of each unique domain will be present, so the log-specific 234 * FUIDs will use an index into a compressed domain table. On replay this 235 * information will be used to construct real FUIDs (and bypass idmap, 236 * since it may not be available). 237 */ 238 239 /* 240 * Log record for creates with optional ACL 241 * This log record is also used for recording any FUID 242 * information needed for replaying the create. If the 243 * file doesn't have any actual ACEs then the lr_aclcnt 244 * would be zero. 245 */ 246 typedef struct { 247 lr_create_t lr_create; /* common create portion */ 248 uint64_t lr_aclcnt; /* number of ACEs in ACL */ 249 uint64_t lr_domcnt; /* number of unique domains */ 250 uint64_t lr_fuidcnt; /* number of real fuids */ 251 uint64_t lr_acl_bytes; /* number of bytes in ACL */ 252 uint64_t lr_acl_flags; /* ACL flags */ 253 /* lr_acl_bytes number of variable sized ace's follows */ 254 /* if create is also setting xvattr's, then acl data follows xvattr */ 255 /* if ACE FUIDs are needed then they will follow the xvattr_t */ 256 /* Following the FUIDs will be the domain table information. */ 257 /* The FUIDs for the owner and group will be in the lr_create */ 258 /* portion of the record. */ 259 /* name follows ACL data */ 260 } lr_acl_create_t; 261 262 typedef struct { 263 lr_t lr_common; /* common portion of log record */ 264 uint64_t lr_doid; /* obj id of directory */ 265 /* name of object to remove follows this */ 266 } lr_remove_t; 267 268 typedef struct { 269 lr_t lr_common; /* common portion of log record */ 270 uint64_t lr_doid; /* obj id of directory */ 271 uint64_t lr_link_obj; /* obj id of link */ 272 /* name of object to link follows this */ 273 } lr_link_t; 274 275 typedef struct { 276 lr_t lr_common; /* common portion of log record */ 277 uint64_t lr_sdoid; /* obj id of source directory */ 278 uint64_t lr_tdoid; /* obj id of target directory */ 279 /* 2 strings: names of source and destination follow this */ 280 } lr_rename_t; 281 282 typedef struct { 283 lr_t lr_common; /* common portion of log record */ 284 uint64_t lr_foid; /* file object to write */ 285 uint64_t lr_offset; /* offset to write to */ 286 uint64_t lr_length; /* user data length to write */ 287 uint64_t lr_blkoff; /* no longer used */ 288 blkptr_t lr_blkptr; /* spa block pointer for replay */ 289 /* write data will follow for small writes */ 290 } lr_write_t; 291 292 typedef struct { 293 lr_t lr_common; /* common portion of log record */ 294 uint64_t lr_foid; /* object id of file to truncate */ 295 uint64_t lr_offset; /* offset to truncate from */ 296 uint64_t lr_length; /* length to truncate */ 297 } lr_truncate_t; 298 299 typedef struct { 300 lr_t lr_common; /* common portion of log record */ 301 uint64_t lr_foid; /* file object to change attributes */ 302 uint64_t lr_mask; /* mask of attributes to set */ 303 uint64_t lr_mode; /* mode to set */ 304 uint64_t lr_uid; /* uid to set */ 305 uint64_t lr_gid; /* gid to set */ 306 uint64_t lr_size; /* size to set */ 307 uint64_t lr_atime[2]; /* access time */ 308 uint64_t lr_mtime[2]; /* modification time */ 309 /* optional attribute lr_attr_t may be here */ 310 } lr_setattr_t; 311 312 typedef struct { 313 lr_t lr_common; /* common portion of log record */ 314 uint64_t lr_foid; /* obj id of file */ 315 uint64_t lr_aclcnt; /* number of acl entries */ 316 /* lr_aclcnt number of ace_t entries follow this */ 317 } lr_acl_v0_t; 318 319 typedef struct { 320 lr_t lr_common; /* common portion of log record */ 321 uint64_t lr_foid; /* obj id of file */ 322 uint64_t lr_aclcnt; /* number of ACEs in ACL */ 323 uint64_t lr_domcnt; /* number of unique domains */ 324 uint64_t lr_fuidcnt; /* number of real fuids */ 325 uint64_t lr_acl_bytes; /* number of bytes in ACL */ 326 uint64_t lr_acl_flags; /* ACL flags */ 327 /* lr_acl_bytes number of variable sized ace's follows */ 328 } lr_acl_t; 329 330 /* 331 * ZIL structure definitions, interface function prototype and globals. 332 */ 333 334 /* 335 * Writes are handled in three different ways: 336 * 337 * WR_INDIRECT: 338 * In this mode, if we need to commit the write later, then the block 339 * is immediately written into the file system (using dmu_sync), 340 * and a pointer to the block is put into the log record. 341 * When the txg commits the block is linked in. 342 * This saves additionally writing the data into the log record. 343 * There are a few requirements for this to occur: 344 * - write is greater than zfs/zvol_immediate_write_sz 345 * - not using slogs (as slogs are assumed to always be faster 346 * than writing into the main pool) 347 * - the write occupies only one block 348 * WR_COPIED: 349 * If we know we'll immediately be committing the 350 * transaction (FSYNC or FDSYNC), the we allocate a larger 351 * log record here for the data and copy the data in. 352 * WR_NEED_COPY: 353 * Otherwise we don't allocate a buffer, and *if* we need to 354 * flush the write later then a buffer is allocated and 355 * we retrieve the data using the dmu. 356 */ 357 typedef enum { 358 WR_INDIRECT, /* indirect - a large write (dmu_sync() data */ 359 /* and put blkptr in log, rather than actual data) */ 360 WR_COPIED, /* immediate - data is copied into lr_write_t */ 361 WR_NEED_COPY, /* immediate - data needs to be copied if pushed */ 362 WR_NUM_STATES /* number of states */ 363 } itx_wr_state_t; 364 365 typedef struct itx { 366 list_node_t itx_node; /* linkage on zl_itx_list */ 367 void *itx_private; /* type-specific opaque data */ 368 itx_wr_state_t itx_wr_state; /* write state */ 369 uint8_t itx_sync; /* synchronous transaction */ 370 uint64_t itx_sod; /* record size on disk */ 371 uint64_t itx_oid; /* object id */ 372 lr_t itx_lr; /* common part of log record */ 373 /* followed by type-specific part of lr_xx_t and its immediate data */ 374 } itx_t; 375 376 typedef int zil_parse_blk_func_t(zilog_t *zilog, blkptr_t *bp, void *arg, 377 uint64_t txg); 378 typedef int zil_parse_lr_func_t(zilog_t *zilog, lr_t *lr, void *arg, 379 uint64_t txg); 380 typedef int zil_replay_func_t(); 381 typedef int zil_get_data_t(void *arg, lr_write_t *lr, char *dbuf, zio_t *zio); 382 383 extern int zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func, 384 zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg); 385 386 extern void zil_init(void); 387 extern void zil_fini(void); 388 389 extern zilog_t *zil_alloc(objset_t *os, zil_header_t *zh_phys); 390 extern void zil_free(zilog_t *zilog); 391 392 extern zilog_t *zil_open(objset_t *os, zil_get_data_t *get_data); 393 extern void zil_close(zilog_t *zilog); 394 395 extern void zil_replay(objset_t *os, void *arg, 396 zil_replay_func_t *replay_func[TX_MAX_TYPE]); 397 extern boolean_t zil_replaying(zilog_t *zilog, dmu_tx_t *tx); 398 extern void zil_destroy(zilog_t *zilog, boolean_t keep_first); 399 extern void zil_destroy_sync(zilog_t *zilog, dmu_tx_t *tx); 400 extern void zil_rollback_destroy(zilog_t *zilog, dmu_tx_t *tx); 401 402 extern itx_t *zil_itx_create(uint64_t txtype, size_t lrsize); 403 extern void zil_itx_destroy(itx_t *itx); 404 extern void zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx); 405 406 extern void zil_commit(zilog_t *zilog, uint64_t oid); 407 408 extern int zil_vdev_offline(const char *osname, void *txarg); 409 extern int zil_claim(const char *osname, void *txarg); 410 extern int zil_check_log_chain(const char *osname, void *txarg); 411 extern void zil_sync(zilog_t *zilog, dmu_tx_t *tx); 412 extern void zil_clean(zilog_t *zilog, uint64_t synced_txg); 413 414 extern int zil_suspend(const char *osname, void **cookiep); 415 extern void zil_resume(void *cookie); 416 417 extern void zil_add_block(zilog_t *zilog, const blkptr_t *bp); 418 extern int zil_bp_tree_add(zilog_t *zilog, const blkptr_t *bp); 419 420 extern void zil_set_sync(zilog_t *zilog, uint64_t syncval); 421 422 extern void zil_set_logbias(zilog_t *zilog, uint64_t slogval); 423 424 extern int zil_replay_disable; 425 426 #ifdef __cplusplus 427 } 428 #endif 429 430 #endif /* _SYS_ZIL_H */ 431