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 2007 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 "@(#)zio.h 1.19 07/12/12 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 errno 'EBADE' (from the Convergent graveyard) 182 * to indicate checksum errors. 183 */ 184 #define ECKSUM EBADE 185 186 typedef struct zio zio_t; 187 typedef void zio_done_func_t(zio_t *zio); 188 189 extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE]; 190 extern char *zio_type_name[ZIO_TYPES]; 191 192 /* 193 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 194 * identifies any block in the pool. By convention, the meta-objset (MOS) 195 * is objset 0, the meta-dnode is object 0, the root block (osphys_t) is 196 * level -1 of the meta-dnode, and intent log blocks (which are chained 197 * off the root block) have blkid == sequence number. In summary: 198 * 199 * mos is objset 0 200 * meta-dnode is object 0 201 * root block is <objset, 0, -1, 0> 202 * intent log is <objset, 0, -1, ZIL sequence number> 203 * 204 * Note: this structure is called a bookmark because its first purpose was 205 * to remember where to resume a pool-wide traverse. The absolute ordering 206 * for block visitation during traversal is defined in compare_bookmark(). 207 * 208 * Note: this structure is passed between userland and the kernel. 209 * Therefore it must not change size or alignment between 32/64 bit 210 * compilation options. 211 */ 212 typedef struct zbookmark { 213 uint64_t zb_objset; 214 uint64_t zb_object; 215 int64_t zb_level; 216 uint64_t zb_blkid; 217 } zbookmark_t; 218 219 struct zio { 220 /* Core information about this I/O */ 221 zio_t *io_parent; 222 zio_t *io_root; 223 spa_t *io_spa; 224 zbookmark_t io_bookmark; 225 enum zio_checksum io_checksum; 226 enum zio_compress io_compress; 227 int io_ndvas; 228 uint64_t io_txg; 229 blkptr_t *io_bp; 230 blkptr_t io_bp_copy; 231 zio_t *io_child; 232 zio_t *io_sibling_prev; 233 zio_t *io_sibling_next; 234 zio_transform_t *io_transform_stack; 235 zio_t *io_logical; 236 list_node_t zio_link_node; 237 238 /* Callback info */ 239 zio_done_func_t *io_ready; 240 zio_done_func_t *io_done; 241 void *io_private; 242 blkptr_t io_bp_orig; 243 244 /* Data represented by this I/O */ 245 void *io_data; 246 uint64_t io_size; 247 248 /* Stuff for the vdev stack */ 249 vdev_t *io_vd; 250 void *io_vsd; 251 uint64_t io_offset; 252 uint64_t io_deadline; 253 uint64_t io_timestamp; 254 avl_node_t io_offset_node; 255 avl_node_t io_deadline_node; 256 avl_tree_t *io_vdev_tree; 257 zio_t *io_delegate_list; 258 zio_t *io_delegate_next; 259 260 /* Internal pipeline state */ 261 int io_flags; 262 int io_orig_flags; 263 enum zio_type io_type; 264 enum zio_stage io_stage; 265 enum zio_stage io_orig_stage; 266 uint8_t io_stalled; 267 uint8_t io_priority; 268 struct dk_callback io_dk_callback; 269 int io_cmd; 270 int io_retries; 271 int io_error; 272 uint32_t io_numerrors; 273 uint32_t io_pipeline; 274 uint32_t io_orig_pipeline; 275 uint64_t io_children_notready; 276 uint64_t io_children_notdone; 277 void *io_waiter; 278 kmutex_t io_lock; 279 kcondvar_t io_cv; 280 281 /* FMA state */ 282 uint64_t io_ena; 283 }; 284 285 extern zio_t *zio_null(zio_t *pio, spa_t *spa, 286 zio_done_func_t *done, void *private, int flags); 287 288 extern zio_t *zio_root(spa_t *spa, 289 zio_done_func_t *done, void *private, int flags); 290 291 extern zio_t *zio_read(zio_t *pio, spa_t *spa, blkptr_t *bp, void *data, 292 uint64_t size, zio_done_func_t *done, void *private, 293 int priority, int flags, zbookmark_t *zb); 294 295 extern zio_t *zio_write(zio_t *pio, spa_t *spa, int checksum, int compress, 296 int ncopies, uint64_t txg, blkptr_t *bp, void *data, uint64_t size, 297 zio_done_func_t *ready, zio_done_func_t *done, void *private, int priority, 298 int flags, zbookmark_t *zb); 299 300 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, int checksum, 301 uint64_t txg, blkptr_t *bp, void *data, uint64_t size, 302 zio_done_func_t *done, void *private, int priority, int flags, 303 zbookmark_t *zb); 304 305 extern zio_t *zio_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 306 zio_done_func_t *done, void *private); 307 308 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 309 zio_done_func_t *done, void *private); 310 311 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 312 zio_done_func_t *done, void *private, int priority, int flags); 313 314 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 315 uint64_t size, void *data, int checksum, 316 zio_done_func_t *done, void *private, int priority, int flags, 317 boolean_t labels); 318 319 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 320 uint64_t size, void *data, int checksum, 321 zio_done_func_t *done, void *private, int priority, int flags, 322 boolean_t labels); 323 324 extern int zio_alloc_blk(spa_t *spa, uint64_t size, blkptr_t *new_bp, 325 blkptr_t *old_bp, uint64_t txg); 326 extern void zio_free_blk(spa_t *spa, blkptr_t *bp, uint64_t txg); 327 extern void zio_flush(zio_t *zio, vdev_t *vd); 328 329 extern int zio_wait(zio_t *zio); 330 extern void zio_nowait(zio_t *zio); 331 extern void zio_execute(zio_t *zio); 332 extern void zio_interrupt(zio_t *zio); 333 334 extern int zio_wait_for_children_ready(zio_t *zio); 335 extern int zio_wait_for_children_done(zio_t *zio); 336 337 extern void *zio_buf_alloc(size_t size); 338 extern void zio_buf_free(void *buf, size_t size); 339 extern void *zio_data_buf_alloc(size_t size); 340 extern void zio_data_buf_free(void *buf, size_t size); 341 342 extern void zio_resubmit_stage_async(void *); 343 344 /* 345 * Delegate I/O to a child vdev. 346 */ 347 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 348 uint64_t offset, void *data, uint64_t size, int type, int priority, 349 int flags, zio_done_func_t *done, void *private); 350 351 extern void zio_vdev_io_bypass(zio_t *zio); 352 extern void zio_vdev_io_reissue(zio_t *zio); 353 extern void zio_vdev_io_redone(zio_t *zio); 354 355 extern void zio_checksum_verified(zio_t *zio); 356 extern void zio_set_gang_verifier(zio_t *zio, zio_cksum_t *zcp); 357 358 extern uint8_t zio_checksum_select(uint8_t child, uint8_t parent); 359 extern uint8_t zio_compress_select(uint8_t child, uint8_t parent); 360 361 extern boolean_t zio_should_retry(zio_t *zio); 362 extern int zio_vdev_resume_io(spa_t *); 363 364 /* 365 * Initial setup and teardown. 366 */ 367 extern void zio_init(void); 368 extern void zio_fini(void); 369 370 /* 371 * Fault injection 372 */ 373 struct zinject_record; 374 extern uint32_t zio_injection_enabled; 375 extern int zio_inject_fault(char *name, int flags, int *id, 376 struct zinject_record *record); 377 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 378 struct zinject_record *record); 379 extern int zio_clear_fault(int id); 380 extern int zio_handle_fault_injection(zio_t *zio, int error); 381 extern int zio_handle_device_injection(vdev_t *vd, int error); 382 383 #ifdef __cplusplus 384 } 385 #endif 386 387 #endif /* _ZIO_H */ 388
Indexes created Sat Nov 28 12:39:51 UTC 2009
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