1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _ZIO_H 28 #define _ZIO_H 29 30 #include <sys/zfs_context.h> 31 #include <sys/spa.h> 32 #include <sys/txg.h> 33 #include <sys/avl.h> 34 #include <sys/fs/zfs.h> 35 #include <sys/zio_impl.h> 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 #define ZBT_MAGIC 0x210da7ab10c7a11ULL /* zio data bloc tail */ 42 43 typedef struct zio_block_tail { 44 uint64_t zbt_magic; /* for validation, endianness */ 45 zio_cksum_t zbt_cksum; /* 256-bit checksum */ 46 } zio_block_tail_t; 47 48 /* 49 * Gang block headers are self-checksumming and contain an array 50 * of block pointers. 51 */ 52 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE 53 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ 54 sizeof (zio_block_tail_t)) / sizeof (blkptr_t)) 55 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ 56 sizeof (zio_block_tail_t) - \ 57 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\ 58 sizeof (uint64_t)) 59 60 typedef struct zio_gbh { 61 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; 62 uint64_t zg_filler[SPA_GBH_FILLER]; 63 zio_block_tail_t zg_tail; 64 } zio_gbh_phys_t; 65 66 enum zio_checksum { 67 ZIO_CHECKSUM_INHERIT = 0, 68 ZIO_CHECKSUM_ON, 69 ZIO_CHECKSUM_OFF, 70 ZIO_CHECKSUM_LABEL, 71 ZIO_CHECKSUM_GANG_HEADER, 72 ZIO_CHECKSUM_ZILOG, 73 ZIO_CHECKSUM_FLETCHER_2, 74 ZIO_CHECKSUM_FLETCHER_4, 75 ZIO_CHECKSUM_SHA256, 76 ZIO_CHECKSUM_FUNCTIONS 77 }; 78 79 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_2 80 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 81 82 enum zio_compress { 83 ZIO_COMPRESS_INHERIT = 0, 84 ZIO_COMPRESS_ON, 85 ZIO_COMPRESS_OFF, 86 ZIO_COMPRESS_LZJB, 87 ZIO_COMPRESS_EMPTY, 88 ZIO_COMPRESS_GZIP_1, 89 ZIO_COMPRESS_GZIP_2, 90 ZIO_COMPRESS_GZIP_3, 91 ZIO_COMPRESS_GZIP_4, 92 ZIO_COMPRESS_GZIP_5, 93 ZIO_COMPRESS_GZIP_6, 94 ZIO_COMPRESS_GZIP_7, 95 ZIO_COMPRESS_GZIP_8, 96 ZIO_COMPRESS_GZIP_9, 97 ZIO_COMPRESS_FUNCTIONS 98 }; 99 100 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB 101 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 102 103 #define ZIO_FAILURE_MODE_WAIT 0 104 #define ZIO_FAILURE_MODE_CONTINUE 1 105 #define ZIO_FAILURE_MODE_PANIC 2 106 107 #define ZIO_PRIORITY_NOW (zio_priority_table[0]) 108 #define ZIO_PRIORITY_SYNC_READ (zio_priority_table[1]) 109 #define ZIO_PRIORITY_SYNC_WRITE (zio_priority_table[2]) 110 #define ZIO_PRIORITY_ASYNC_READ (zio_priority_table[3]) 111 #define ZIO_PRIORITY_ASYNC_WRITE (zio_priority_table[4]) 112 #define ZIO_PRIORITY_FREE (zio_priority_table[5]) 113 #define ZIO_PRIORITY_CACHE_FILL (zio_priority_table[6]) 114 #define ZIO_PRIORITY_LOG_WRITE (zio_priority_table[7]) 115 #define ZIO_PRIORITY_RESILVER (zio_priority_table[8]) 116 #define ZIO_PRIORITY_SCRUB (zio_priority_table[9]) 117 #define ZIO_PRIORITY_TABLE_SIZE 10 118 119 #define ZIO_FLAG_MUSTSUCCEED 0x00000 120 #define ZIO_FLAG_CANFAIL 0x00001 121 #define ZIO_FLAG_SPECULATIVE 0x00002 122 #define ZIO_FLAG_CONFIG_WRITER 0x00004 123 #define ZIO_FLAG_DONT_RETRY 0x00008 124 125 #define ZIO_FLAG_DONT_CACHE 0x00010 126 #define ZIO_FLAG_DONT_QUEUE 0x00020 127 #define ZIO_FLAG_DONT_AGGREGATE 0x00040 128 #define ZIO_FLAG_DONT_PROPAGATE 0x00080 129 130 #define ZIO_FLAG_IO_BYPASS 0x00100 131 #define ZIO_FLAG_IO_REPAIR 0x00200 132 #define ZIO_FLAG_IO_RETRY 0x00400 133 #define ZIO_FLAG_IO_REWRITE 0x00800 134 135 #define ZIO_FLAG_SELF_HEAL 0x01000 136 #define ZIO_FLAG_RESILVER 0x02000 137 #define ZIO_FLAG_SCRUB 0x04000 138 #define ZIO_FLAG_SCRUB_THREAD 0x08000 139 140 #define ZIO_FLAG_PROBE 0x10000 141 #define ZIO_FLAG_GANG_CHILD 0x20000 142 143 #define ZIO_FLAG_GANG_INHERIT \ 144 (ZIO_FLAG_CANFAIL | \ 145 ZIO_FLAG_SPECULATIVE | \ 146 ZIO_FLAG_CONFIG_WRITER | \ 147 ZIO_FLAG_DONT_RETRY | \ 148 ZIO_FLAG_DONT_CACHE | \ 149 ZIO_FLAG_DONT_AGGREGATE | \ 150 ZIO_FLAG_SELF_HEAL | \ 151 ZIO_FLAG_RESILVER | \ 152 ZIO_FLAG_SCRUB | \ 153 ZIO_FLAG_SCRUB_THREAD) 154 155 #define ZIO_FLAG_VDEV_INHERIT \ 156 (ZIO_FLAG_GANG_INHERIT | \ 157 ZIO_FLAG_IO_REPAIR | \ 158 ZIO_FLAG_IO_RETRY | \ 159 ZIO_FLAG_PROBE) 160 161 #define ZIO_FLAG_AGG_INHERIT \ 162 (ZIO_FLAG_DONT_AGGREGATE | \ 163 ZIO_FLAG_IO_REPAIR | \ 164 ZIO_FLAG_SELF_HEAL | \ 165 ZIO_FLAG_RESILVER | \ 166 ZIO_FLAG_SCRUB | \ 167 ZIO_FLAG_SCRUB_THREAD) 168 169 #define ZIO_PIPELINE_CONTINUE 0x100 170 #define ZIO_PIPELINE_STOP 0x101 171 172 #define ZIO_GANG_CHILD_FLAGS(zio) \ 173 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 174 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 175 176 enum zio_child { 177 ZIO_CHILD_VDEV = 0, 178 ZIO_CHILD_GANG, 179 ZIO_CHILD_LOGICAL, 180 ZIO_CHILD_TYPES 181 }; 182 183 enum zio_wait_type { 184 ZIO_WAIT_READY = 0, 185 ZIO_WAIT_DONE, 186 ZIO_WAIT_TYPES 187 }; 188 189 /* 190 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 191 * graveyard) to indicate checksum errors and fragmentation. 192 */ 193 #define ECKSUM EBADE 194 #define EFRAGS EBADR 195 196 typedef struct zio zio_t; 197 typedef void zio_done_func_t(zio_t *zio); 198 199 extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE]; 200 extern char *zio_type_name[ZIO_TYPES]; 201 202 /* 203 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 204 * identifies any block in the pool. By convention, the meta-objset (MOS) 205 * is objset 0, the meta-dnode is object 0, the root block (osphys_t) is 206 * level -1 of the meta-dnode, and intent log blocks (which are chained 207 * off the root block) have blkid == sequence number. In summary: 208 * 209 * mos is objset 0 210 * meta-dnode is object 0 211 * root block is <objset, 0, -1, 0> 212 * intent log is <objset, 0, -1, ZIL sequence number> 213 * 214 * Note: this structure is called a bookmark because its first purpose was 215 * to remember where to resume a pool-wide traverse. The absolute ordering 216 * for block visitation during traversal is defined in compare_bookmark(). 217 * 218 * Note: this structure is passed between userland and the kernel. 219 * Therefore it must not change size or alignment between 32/64 bit 220 * compilation options. 221 */ 222 typedef struct zbookmark { 223 uint64_t zb_objset; 224 uint64_t zb_object; 225 int64_t zb_level; 226 uint64_t zb_blkid; 227 } zbookmark_t; 228 229 typedef struct zio_prop { 230 enum zio_checksum zp_checksum; 231 enum zio_compress zp_compress; 232 dmu_object_type_t zp_type; 233 uint8_t zp_level; 234 uint8_t zp_ndvas; 235 } zio_prop_t; 236 237 typedef struct zio_gang_node { 238 zio_gbh_phys_t *gn_gbh; 239 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 240 } zio_gang_node_t; 241 242 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 243 zio_gang_node_t *gn, void *data); 244 245 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 246 247 typedef struct zio_transform { 248 void *zt_orig_data; 249 uint64_t zt_orig_size; 250 uint64_t zt_bufsize; 251 zio_transform_func_t *zt_transform; 252 struct zio_transform *zt_next; 253 } zio_transform_t; 254 255 typedef int zio_pipe_stage_t(zio_t *zio); 256 257 /* 258 * The io_reexecute flags are distinct from io_flags because the child must 259 * be able to propagate them to the parent. The normal io_flags are local 260 * to the zio, not protected by any lock, and not modifiable by children; 261 * the reexecute flags are protected by io_lock, modifiable by children, 262 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 263 */ 264 #define ZIO_REEXECUTE_NOW 0x01 265 #define ZIO_REEXECUTE_SUSPEND 0x02 266 267 struct zio { 268 /* Core information about this I/O */ 269 zbookmark_t io_bookmark; 270 zio_prop_t io_prop; 271 zio_type_t io_type; 272 enum zio_child io_child_type; 273 int io_cmd; 274 uint8_t io_priority; 275 uint8_t io_reexecute; 276 uint8_t io_async_root; 277 uint64_t io_txg; 278 spa_t *io_spa; 279 blkptr_t *io_bp; 280 blkptr_t io_bp_copy; 281 zio_t *io_parent; 282 zio_t *io_child; 283 zio_t *io_sibling_prev; 284 zio_t *io_sibling_next; 285 zio_t *io_logical; 286 zio_transform_t *io_transform_stack; 287 288 /* Callback info */ 289 zio_done_func_t *io_ready; 290 zio_done_func_t *io_done; 291 void *io_private; 292 blkptr_t io_bp_orig; 293 294 /* Data represented by this I/O */ 295 void *io_data; 296 uint64_t io_size; 297 298 /* Stuff for the vdev stack */ 299 vdev_t *io_vd; 300 void *io_vsd; 301 zio_done_func_t *io_vsd_free; 302 uint64_t io_offset; 303 uint64_t io_deadline; 304 avl_node_t io_offset_node; 305 avl_node_t io_deadline_node; 306 avl_tree_t *io_vdev_tree; 307 zio_t *io_delegate_list; 308 zio_t *io_delegate_next; 309 310 /* Internal pipeline state */ 311 int io_flags; 312 zio_stage_t io_stage; 313 uint32_t io_pipeline; 314 int io_orig_flags; 315 zio_stage_t io_orig_stage; 316 uint32_t io_orig_pipeline; 317 int io_error; 318 int io_child_error[ZIO_CHILD_TYPES]; 319 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 320 uint64_t *io_stall; 321 zio_gang_node_t *io_gang_tree; 322 void *io_executor; 323 void *io_waiter; 324 kmutex_t io_lock; 325 kcondvar_t io_cv; 326 327 /* FMA state */ 328 uint64_t io_ena; 329 }; 330 331 extern zio_t *zio_null(zio_t *pio, spa_t *spa, 332 zio_done_func_t *done, void *private, int flags); 333 334 extern zio_t *zio_root(spa_t *spa, 335 zio_done_func_t *done, void *private, int flags); 336 337 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 338 uint64_t size, zio_done_func_t *done, void *private, 339 int priority, int flags, const zbookmark_t *zb); 340 341 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 342 void *data, uint64_t size, zio_prop_t *zp, 343 zio_done_func_t *ready, zio_done_func_t *done, void *private, 344 int priority, int flags, const zbookmark_t *zb); 345 346 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 347 void *data, uint64_t size, zio_done_func_t *done, void *private, 348 int priority, int flags, zbookmark_t *zb); 349 350 extern void zio_skip_write(zio_t *zio); 351 352 extern zio_t *zio_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 353 zio_done_func_t *done, void *private, int flags); 354 355 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 356 zio_done_func_t *done, void *private, int flags); 357 358 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 359 zio_done_func_t *done, void *private, int priority, int flags); 360 361 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 362 uint64_t size, void *data, int checksum, 363 zio_done_func_t *done, void *private, int priority, int flags, 364 boolean_t labels); 365 366 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 367 uint64_t size, void *data, int checksum, 368 zio_done_func_t *done, void *private, int priority, int flags, 369 boolean_t labels); 370 371 extern int zio_alloc_blk(spa_t *spa, uint64_t size, blkptr_t *new_bp, 372 blkptr_t *old_bp, uint64_t txg); 373 extern void zio_free_blk(spa_t *spa, blkptr_t *bp, uint64_t txg); 374 extern void zio_flush(zio_t *zio, vdev_t *vd); 375 376 extern int zio_wait(zio_t *zio); 377 extern void zio_nowait(zio_t *zio); 378 extern void zio_execute(zio_t *zio); 379 extern void zio_interrupt(zio_t *zio); 380 381 extern void *zio_buf_alloc(size_t size); 382 extern void zio_buf_free(void *buf, size_t size); 383 extern void *zio_data_buf_alloc(size_t size); 384 extern void zio_data_buf_free(void *buf, size_t size); 385 386 extern void zio_resubmit_stage_async(void *); 387 388 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 389 uint64_t offset, void *data, uint64_t size, int type, int priority, 390 int flags, zio_done_func_t *done, void *private); 391 392 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 393 void *data, uint64_t size, int type, int priority, 394 int flags, zio_done_func_t *done, void *private); 395 396 extern void zio_vdev_io_bypass(zio_t *zio); 397 extern void zio_vdev_io_reissue(zio_t *zio); 398 extern void zio_vdev_io_redone(zio_t *zio); 399 400 extern void zio_checksum_verified(zio_t *zio); 401 extern int zio_worst_error(int e1, int e2); 402 403 extern uint8_t zio_checksum_select(uint8_t child, uint8_t parent); 404 extern uint8_t zio_compress_select(uint8_t child, uint8_t parent); 405 406 extern void zio_suspend(spa_t *spa, zio_t *zio); 407 extern void zio_resume(spa_t *spa); 408 extern void zio_resume_wait(spa_t *spa); 409 410 /* 411 * Initial setup and teardown. 412 */ 413 extern void zio_init(void); 414 extern void zio_fini(void); 415 416 /* 417 * Fault injection 418 */ 419 struct zinject_record; 420 extern uint32_t zio_injection_enabled; 421 extern int zio_inject_fault(char *name, int flags, int *id, 422 struct zinject_record *record); 423 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 424 struct zinject_record *record); 425 extern int zio_clear_fault(int id); 426 extern int zio_handle_fault_injection(zio_t *zio, int error); 427 extern int zio_handle_device_injection(vdev_t *vd, int error); 428 extern int zio_handle_label_injection(zio_t *zio, int error); 429 430 #ifdef __cplusplus 431 } 432 #endif 433 434 #endif /* _ZIO_H */ 435