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 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <sys/zfs_context.h> 33 #include <sys/spa.h> 34 #include <sys/txg.h> 35 #include <sys/avl.h> 36 #include <sys/dkio.h> 37 #include <sys/fs/zfs.h> 38 #include <sys/zio_impl.h> 39 40 #ifdef __cplusplus 41 extern "C" { 42 #endif 43 44 #define ZBT_MAGIC 0x210da7ab10c7a11ULL /* zio data bloc tail */ 45 46 typedef struct zio_block_tail { 47 uint64_t zbt_magic; /* for validation, endianness */ 48 zio_cksum_t zbt_cksum; /* 256-bit checksum */ 49 } zio_block_tail_t; 50 51 /* 52 * Gang block headers are self-checksumming and contain an array 53 * of block pointers. 54 */ 55 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE 56 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ 57 sizeof (zio_block_tail_t)) / sizeof (blkptr_t)) 58 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ 59 sizeof (zio_block_tail_t) - \ 60 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\ 61 sizeof (uint64_t)) 62 63 #define ZIO_GET_IOSIZE(zio) \ 64 (BP_IS_GANG((zio)->io_bp) ? \ 65 SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp)) 66 67 typedef struct zio_gbh { 68 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; 69 uint64_t zg_filler[SPA_GBH_FILLER]; 70 zio_block_tail_t zg_tail; 71 } zio_gbh_phys_t; 72 73 enum zio_checksum { 74 ZIO_CHECKSUM_INHERIT = 0, 75 ZIO_CHECKSUM_ON, 76 ZIO_CHECKSUM_OFF, 77 ZIO_CHECKSUM_LABEL, 78 ZIO_CHECKSUM_GANG_HEADER, 79 ZIO_CHECKSUM_ZILOG, 80 ZIO_CHECKSUM_FLETCHER_2, 81 ZIO_CHECKSUM_FLETCHER_4, 82 ZIO_CHECKSUM_SHA256, 83 ZIO_CHECKSUM_FUNCTIONS 84 }; 85 86 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_2 87 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 88 89 enum zio_compress { 90 ZIO_COMPRESS_INHERIT = 0, 91 ZIO_COMPRESS_ON, 92 ZIO_COMPRESS_OFF, 93 ZIO_COMPRESS_LZJB, 94 ZIO_COMPRESS_EMPTY, 95 ZIO_COMPRESS_GZIP_1, 96 ZIO_COMPRESS_GZIP_2, 97 ZIO_COMPRESS_GZIP_3, 98 ZIO_COMPRESS_GZIP_4, 99 ZIO_COMPRESS_GZIP_5, 100 ZIO_COMPRESS_GZIP_6, 101 ZIO_COMPRESS_GZIP_7, 102 ZIO_COMPRESS_GZIP_8, 103 ZIO_COMPRESS_GZIP_9, 104 ZIO_COMPRESS_FUNCTIONS 105 }; 106 107 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB 108 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 109 110 #define ZIO_FAILURE_MODE_WAIT 0 111 #define ZIO_FAILURE_MODE_CONTINUE 1 112 #define ZIO_FAILURE_MODE_PANIC 2 113 114 #define ZIO_PRIORITY_NOW (zio_priority_table[0]) 115 #define ZIO_PRIORITY_SYNC_READ (zio_priority_table[1]) 116 #define ZIO_PRIORITY_SYNC_WRITE (zio_priority_table[2]) 117 #define ZIO_PRIORITY_ASYNC_READ (zio_priority_table[3]) 118 #define ZIO_PRIORITY_ASYNC_WRITE (zio_priority_table[4]) 119 #define ZIO_PRIORITY_FREE (zio_priority_table[5]) 120 #define ZIO_PRIORITY_CACHE_FILL (zio_priority_table[6]) 121 #define ZIO_PRIORITY_LOG_WRITE (zio_priority_table[7]) 122 #define ZIO_PRIORITY_RESILVER (zio_priority_table[8]) 123 #define ZIO_PRIORITY_SCRUB (zio_priority_table[9]) 124 #define ZIO_PRIORITY_TABLE_SIZE 10 125 126 #define ZIO_FLAG_MUSTSUCCEED 0x00000 127 #define ZIO_FLAG_CANFAIL 0x00001 128 #define ZIO_FLAG_FAILFAST 0x00002 129 #define ZIO_FLAG_CONFIG_HELD 0x00004 130 #define ZIO_FLAG_CONFIG_GRABBED 0x00008 131 132 #define ZIO_FLAG_DONT_CACHE 0x00010 133 #define ZIO_FLAG_DONT_QUEUE 0x00020 134 #define ZIO_FLAG_DONT_PROPAGATE 0x00040 135 #define ZIO_FLAG_DONT_RETRY 0x00080 136 137 #define ZIO_FLAG_PHYSICAL 0x00100 138 #define ZIO_FLAG_IO_BYPASS 0x00200 139 #define ZIO_FLAG_IO_REPAIR 0x00400 140 #define ZIO_FLAG_SPECULATIVE 0x00800 141 142 #define ZIO_FLAG_RESILVER 0x01000 143 #define ZIO_FLAG_SCRUB 0x02000 144 #define ZIO_FLAG_SCRUB_THREAD 0x04000 145 #define ZIO_FLAG_SUBBLOCK 0x08000 146 147 #define ZIO_FLAG_NOBOOKMARK 0x10000 148 #define ZIO_FLAG_USER 0x20000 149 #define ZIO_FLAG_METADATA 0x40000 150 #define ZIO_FLAG_WRITE_RETRY 0x80000 151 152 #define ZIO_FLAG_GANG_INHERIT \ 153 (ZIO_FLAG_CANFAIL | \ 154 ZIO_FLAG_FAILFAST | \ 155 ZIO_FLAG_CONFIG_HELD | \ 156 ZIO_FLAG_DONT_CACHE | \ 157 ZIO_FLAG_DONT_RETRY | \ 158 ZIO_FLAG_IO_REPAIR | \ 159 ZIO_FLAG_SPECULATIVE | \ 160 ZIO_FLAG_RESILVER | \ 161 ZIO_FLAG_SCRUB | \ 162 ZIO_FLAG_SCRUB_THREAD | \ 163 ZIO_FLAG_USER | \ 164 ZIO_FLAG_METADATA) 165 166 #define ZIO_FLAG_VDEV_INHERIT \ 167 (ZIO_FLAG_GANG_INHERIT | \ 168 ZIO_FLAG_PHYSICAL) 169 170 #define ZIO_FLAG_RETRY_INHERIT \ 171 (ZIO_FLAG_VDEV_INHERIT | \ 172 ZIO_FLAG_CONFIG_GRABBED | \ 173 ZIO_FLAG_DONT_PROPAGATE | \ 174 ZIO_FLAG_NOBOOKMARK) 175 176 177 #define ZIO_PIPELINE_CONTINUE 0x100 178 #define ZIO_PIPELINE_STOP 0x101 179 180 /* 181 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 182 * graveyard) to indicate checksum errors and fragmentation. 183 */ 184 #define ECKSUM EBADE 185 #define EFRAGS EBADR 186 187 typedef struct zio zio_t; 188 typedef void zio_done_func_t(zio_t *zio); 189 190 extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE]; 191 extern char *zio_type_name[ZIO_TYPES]; 192 193 /* 194 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 195 * identifies any block in the pool. By convention, the meta-objset (MOS) 196 * is objset 0, the meta-dnode is object 0, the root block (osphys_t) is 197 * level -1 of the meta-dnode, and intent log blocks (which are chained 198 * off the root block) have blkid == sequence number. In summary: 199 * 200 * mos is objset 0 201 * meta-dnode is object 0 202 * root block is <objset, 0, -1, 0> 203 * intent log is <objset, 0, -1, ZIL sequence number> 204 * 205 * Note: this structure is called a bookmark because its first purpose was 206 * to remember where to resume a pool-wide traverse. The absolute ordering 207 * for block visitation during traversal is defined in compare_bookmark(). 208 * 209 * Note: this structure is passed between userland and the kernel. 210 * Therefore it must not change size or alignment between 32/64 bit 211 * compilation options. 212 */ 213 typedef struct zbookmark { 214 uint64_t zb_objset; 215 uint64_t zb_object; 216 int64_t zb_level; 217 uint64_t zb_blkid; 218 } zbookmark_t; 219 220 struct zio { 221 /* Core information about this I/O */ 222 zio_t *io_parent; 223 zio_t *io_root; 224 spa_t *io_spa; 225 zbookmark_t io_bookmark; 226 enum zio_checksum io_checksum; 227 enum zio_compress io_compress; 228 int io_ndvas; 229 uint64_t io_txg; 230 blkptr_t *io_bp; 231 blkptr_t io_bp_copy; 232 zio_t *io_child; 233 zio_t *io_sibling_prev; 234 zio_t *io_sibling_next; 235 zio_transform_t *io_transform_stack; 236 zio_t *io_logical; 237 list_node_t zio_link_node; 238 239 /* Callback info */ 240 zio_done_func_t *io_ready; 241 zio_done_func_t *io_done; 242 void *io_private; 243 blkptr_t io_bp_orig; 244 245 /* Data represented by this I/O */ 246 void *io_data; 247 uint64_t io_size; 248 249 /* Stuff for the vdev stack */ 250 vdev_t *io_vd; 251 void *io_vsd; 252 uint64_t io_offset; 253 uint64_t io_deadline; 254 uint64_t io_timestamp; 255 avl_node_t io_offset_node; 256 avl_node_t io_deadline_node; 257 avl_tree_t *io_vdev_tree; 258 zio_t *io_delegate_list; 259 zio_t *io_delegate_next; 260 261 /* Internal pipeline state */ 262 int io_flags; 263 int io_orig_flags; 264 enum zio_type io_type; 265 enum zio_stage io_stage; 266 enum zio_stage io_orig_stage; 267 uint8_t io_stalled; 268 uint8_t io_priority; 269 struct dk_callback io_dk_callback; 270 int io_cmd; 271 int io_retries; 272 int io_error; 273 uint32_t io_numerrors; 274 uint32_t io_pipeline; 275 uint32_t io_orig_pipeline; 276 uint64_t io_children_notready; 277 uint64_t io_children_notdone; 278 void *io_waiter; 279 kmutex_t io_lock; 280 kcondvar_t io_cv; 281 282 /* FMA state */ 283 uint64_t io_ena; 284 }; 285 286 extern zio_t *zio_null(zio_t *pio, spa_t *spa, 287 zio_done_func_t *done, void *private, int flags); 288 289 extern zio_t *zio_root(spa_t *spa, 290 zio_done_func_t *done, void *private, int flags); 291 292 extern zio_t *zio_read(zio_t *pio, spa_t *spa, blkptr_t *bp, void *data, 293 uint64_t size, zio_done_func_t *done, void *private, 294 int priority, int flags, zbookmark_t *zb); 295 296 extern zio_t *zio_write(zio_t *pio, spa_t *spa, int checksum, int compress, 297 int ncopies, uint64_t txg, blkptr_t *bp, void *data, uint64_t size, 298 zio_done_func_t *ready, zio_done_func_t *done, void *private, int priority, 299 int flags, zbookmark_t *zb); 300 301 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, int checksum, 302 uint64_t txg, blkptr_t *bp, void *data, uint64_t size, 303 zio_done_func_t *done, void *private, int priority, int flags, 304 zbookmark_t *zb); 305 306 extern zio_t *zio_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 307 zio_done_func_t *done, void *private); 308 309 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 310 zio_done_func_t *done, void *private); 311 312 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 313 zio_done_func_t *done, void *private, int priority, int flags); 314 315 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 316 uint64_t size, void *data, int checksum, 317 zio_done_func_t *done, void *private, int priority, int flags, 318 boolean_t labels); 319 320 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 321 uint64_t size, void *data, int checksum, 322 zio_done_func_t *done, void *private, int priority, int flags, 323 boolean_t labels); 324 325 extern int zio_alloc_blk(spa_t *spa, uint64_t size, blkptr_t *new_bp, 326 blkptr_t *old_bp, uint64_t txg); 327 extern void zio_free_blk(spa_t *spa, blkptr_t *bp, uint64_t txg); 328 extern void zio_flush(zio_t *zio, vdev_t *vd); 329 330 extern int zio_wait(zio_t *zio); 331 extern void zio_nowait(zio_t *zio); 332 extern void zio_execute(zio_t *zio); 333 extern void zio_interrupt(zio_t *zio); 334 335 extern int zio_wait_for_children_ready(zio_t *zio); 336 extern int zio_wait_for_children_done(zio_t *zio); 337 338 extern void *zio_buf_alloc(size_t size); 339 extern void zio_buf_free(void *buf, size_t size); 340 extern void *zio_data_buf_alloc(size_t size); 341 extern void zio_data_buf_free(void *buf, size_t size); 342 343 extern void zio_resubmit_stage_async(void *); 344 345 /* 346 * Delegate I/O to a child vdev. 347 */ 348 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 349 uint64_t offset, void *data, uint64_t size, int type, int priority, 350 int flags, zio_done_func_t *done, void *private); 351 352 extern void zio_vdev_io_bypass(zio_t *zio); 353 extern void zio_vdev_io_reissue(zio_t *zio); 354 extern void zio_vdev_io_redone(zio_t *zio); 355 356 extern void zio_checksum_verified(zio_t *zio); 357 extern void zio_set_gang_verifier(zio_t *zio, zio_cksum_t *zcp); 358 359 extern uint8_t zio_checksum_select(uint8_t child, uint8_t parent); 360 extern uint8_t zio_compress_select(uint8_t child, uint8_t parent); 361 362 extern boolean_t zio_should_retry(zio_t *zio); 363 extern int zio_vdev_resume_io(spa_t *); 364 365 /* 366 * Initial setup and teardown. 367 */ 368 extern void zio_init(void); 369 extern void zio_fini(void); 370 371 /* 372 * Fault injection 373 */ 374 struct zinject_record; 375 extern uint32_t zio_injection_enabled; 376 extern int zio_inject_fault(char *name, int flags, int *id, 377 struct zinject_record *record); 378 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 379 struct zinject_record *record); 380 extern int zio_clear_fault(int id); 381 extern int zio_handle_fault_injection(zio_t *zio, int error); 382 extern int zio_handle_device_injection(vdev_t *vd, int error); 383 384 #ifdef __cplusplus 385 } 386 #endif 387 388 #endif /* _ZIO_H */ 389