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 2011 Nexenta Systems, Inc. All rights reserved. 24 * Copyright (c) 2012 by Delphix. All rights reserved. 25 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 26 */ 27 28 #ifndef _SYS_ZFS_CONTEXT_H 29 #define _SYS_ZFS_CONTEXT_H 30 31 #ifdef __cplusplus 32 extern "C" { 33 #endif 34 35 #define _SYS_MUTEX_H 36 #define _SYS_RWLOCK_H 37 #define _SYS_CONDVAR_H 38 #define _SYS_SYSTM_H 39 #define _SYS_T_LOCK_H 40 #define _SYS_VNODE_H 41 #define _SYS_VFS_H 42 #define _SYS_SUNDDI_H 43 #define _SYS_CALLB_H 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <stddef.h> 48 #include <stdarg.h> 49 #include <fcntl.h> 50 #include <unistd.h> 51 #include <errno.h> 52 #include <string.h> 53 #include <strings.h> 54 #include <synch.h> 55 #include <thread.h> 56 #include <assert.h> 57 #include <alloca.h> 58 #include <umem.h> 59 #include <limits.h> 60 #include <atomic.h> 61 #include <dirent.h> 62 #include <time.h> 63 #include <procfs.h> 64 #include <pthread.h> 65 #include <sys/debug.h> 66 #include <libsysevent.h> 67 #include <sys/note.h> 68 #include <sys/types.h> 69 #include <sys/cred.h> 70 #include <sys/sysmacros.h> 71 #include <sys/bitmap.h> 72 #include <sys/resource.h> 73 #include <sys/byteorder.h> 74 #include <sys/list.h> 75 #include <sys/uio.h> 76 #include <sys/zfs_debug.h> 77 #include <sys/sdt.h> 78 #include <sys/kstat.h> 79 #include <sys/u8_textprep.h> 80 #include <sys/sysevent/eventdefs.h> 81 #include <sys/sysevent/dev.h> 82 #include <sys/sunddi.h> 83 #include <sys/debug.h> 84 85 /* 86 * Debugging 87 */ 88 89 /* 90 * Note that we are not using the debugging levels. 91 */ 92 93 #define CE_CONT 0 /* continuation */ 94 #define CE_NOTE 1 /* notice */ 95 #define CE_WARN 2 /* warning */ 96 #define CE_PANIC 3 /* panic */ 97 #define CE_IGNORE 4 /* print nothing */ 98 99 /* 100 * ZFS debugging 101 */ 102 103 #ifdef ZFS_DEBUG 104 extern void dprintf_setup(int *argc, char **argv); 105 #endif /* ZFS_DEBUG */ 106 107 extern void cmn_err(int, const char *, ...); 108 extern void vcmn_err(int, const char *, __va_list); 109 extern void panic(const char *, ...); 110 extern void vpanic(const char *, __va_list); 111 112 #define fm_panic panic 113 114 extern int aok; 115 116 /* 117 * DTrace SDT probes have different signatures in userland than they do in 118 * kernel. If they're being used in kernel code, re-define them out of 119 * existence for their counterparts in libzpool. 120 */ 121 122 #ifdef DTRACE_PROBE 123 #undef DTRACE_PROBE 124 #define DTRACE_PROBE(a) ((void)0) 125 #endif /* DTRACE_PROBE */ 126 127 #ifdef DTRACE_PROBE1 128 #undef DTRACE_PROBE1 129 #define DTRACE_PROBE1(a, b, c) ((void)0) 130 #endif /* DTRACE_PROBE1 */ 131 132 #ifdef DTRACE_PROBE2 133 #undef DTRACE_PROBE2 134 #define DTRACE_PROBE2(a, b, c, d, e) ((void)0) 135 #endif /* DTRACE_PROBE2 */ 136 137 #ifdef DTRACE_PROBE3 138 #undef DTRACE_PROBE3 139 #define DTRACE_PROBE3(a, b, c, d, e, f, g) ((void)0) 140 #endif /* DTRACE_PROBE3 */ 141 142 #ifdef DTRACE_PROBE4 143 #undef DTRACE_PROBE4 144 #define DTRACE_PROBE4(a, b, c, d, e, f, g, h, i) ((void)0) 145 #endif /* DTRACE_PROBE4 */ 146 147 /* 148 * Threads 149 */ 150 #define curthread ((void *)(uintptr_t)thr_self()) 151 152 typedef struct kthread kthread_t; 153 154 #define thread_create(stk, stksize, func, arg, len, pp, state, pri) \ 155 zk_thread_create(func, arg) 156 #define thread_exit() thr_exit(NULL) 157 #define thread_join(t) panic("libzpool cannot join threads") 158 159 #define newproc(f, a, cid, pri, ctp, pid) (ENOSYS) 160 161 /* in libzpool, p0 exists only to have its address taken */ 162 struct proc { 163 uintptr_t this_is_never_used_dont_dereference_it; 164 }; 165 166 extern struct proc p0; 167 #define curproc (&p0) 168 169 #define PS_NONE -1 170 171 extern kthread_t *zk_thread_create(void (*func)(), void *arg); 172 173 #define issig(why) (FALSE) 174 #define ISSIG(thr, why) (FALSE) 175 176 /* 177 * Mutexes 178 */ 179 typedef struct kmutex { 180 void *m_owner; 181 boolean_t initialized; 182 mutex_t m_lock; 183 } kmutex_t; 184 185 #define MUTEX_DEFAULT USYNC_THREAD 186 #undef MUTEX_HELD 187 #undef MUTEX_NOT_HELD 188 #define MUTEX_HELD(m) _mutex_held(&(m)->m_lock) 189 #define MUTEX_NOT_HELD(m) (!MUTEX_HELD(m)) 190 191 /* 192 * Argh -- we have to get cheesy here because the kernel and userland 193 * have different signatures for the same routine. 194 */ 195 extern int _mutex_init(mutex_t *mp, int type, void *arg); 196 extern int _mutex_destroy(mutex_t *mp); 197 198 #define mutex_init(mp, b, c, d) zmutex_init((kmutex_t *)(mp)) 199 #define mutex_destroy(mp) zmutex_destroy((kmutex_t *)(mp)) 200 201 extern void zmutex_init(kmutex_t *mp); 202 extern void zmutex_destroy(kmutex_t *mp); 203 extern void mutex_enter(kmutex_t *mp); 204 extern void mutex_exit(kmutex_t *mp); 205 extern int mutex_tryenter(kmutex_t *mp); 206 extern void *mutex_owner(kmutex_t *mp); 207 208 /* 209 * RW locks 210 */ 211 typedef struct krwlock { 212 void *rw_owner; 213 boolean_t initialized; 214 rwlock_t rw_lock; 215 } krwlock_t; 216 217 typedef int krw_t; 218 219 #define RW_READER 0 220 #define RW_WRITER 1 221 #define RW_DEFAULT USYNC_THREAD 222 223 #undef RW_READ_HELD 224 #define RW_READ_HELD(x) _rw_read_held(&(x)->rw_lock) 225 226 #undef RW_WRITE_HELD 227 #define RW_WRITE_HELD(x) _rw_write_held(&(x)->rw_lock) 228 229 #undef RW_LOCK_HELD 230 #define RW_LOCK_HELD(x) (RW_READ_HELD(x) || RW_WRITE_HELD(x)) 231 232 extern void rw_init(krwlock_t *rwlp, char *name, int type, void *arg); 233 extern void rw_destroy(krwlock_t *rwlp); 234 extern void rw_enter(krwlock_t *rwlp, krw_t rw); 235 extern int rw_tryenter(krwlock_t *rwlp, krw_t rw); 236 extern int rw_tryupgrade(krwlock_t *rwlp); 237 extern void rw_exit(krwlock_t *rwlp); 238 #define rw_downgrade(rwlp) do { } while (0) 239 240 extern uid_t crgetuid(cred_t *cr); 241 extern uid_t crgetruid(cred_t *cr); 242 extern gid_t crgetgid(cred_t *cr); 243 extern int crgetngroups(cred_t *cr); 244 extern gid_t *crgetgroups(cred_t *cr); 245 246 /* 247 * Condition variables 248 */ 249 typedef cond_t kcondvar_t; 250 251 #define CV_DEFAULT USYNC_THREAD 252 253 extern void cv_init(kcondvar_t *cv, char *name, int type, void *arg); 254 extern void cv_destroy(kcondvar_t *cv); 255 extern void cv_wait(kcondvar_t *cv, kmutex_t *mp); 256 extern clock_t cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime); 257 extern clock_t cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim, 258 hrtime_t res, int flag); 259 extern void cv_signal(kcondvar_t *cv); 260 extern void cv_broadcast(kcondvar_t *cv); 261 262 /* 263 * Thread-specific data 264 */ 265 #define tsd_get(k) pthread_getspecific(k) 266 #define tsd_set(k, v) pthread_setspecific(k, v) 267 #define tsd_create(kp, d) pthread_key_create(kp, d) 268 #define tsd_destroy(kp) /* nothing */ 269 270 /* 271 * kstat creation, installation and deletion 272 */ 273 extern kstat_t *kstat_create(const char *, int, 274 const char *, const char *, uchar_t, ulong_t, uchar_t); 275 extern void kstat_install(kstat_t *); 276 extern void kstat_delete(kstat_t *); 277 extern void kstat_waitq_enter(kstat_io_t *); 278 extern void kstat_waitq_exit(kstat_io_t *); 279 extern void kstat_runq_enter(kstat_io_t *); 280 extern void kstat_runq_exit(kstat_io_t *); 281 extern void kstat_waitq_to_runq(kstat_io_t *); 282 extern void kstat_runq_back_to_waitq(kstat_io_t *); 283 284 /* 285 * Kernel memory 286 */ 287 #define KM_SLEEP UMEM_NOFAIL 288 #define KM_PUSHPAGE KM_SLEEP 289 #define KM_NOSLEEP UMEM_DEFAULT 290 #define KMC_NODEBUG UMC_NODEBUG 291 #define KMC_NOTOUCH 0 /* not needed for userland caches */ 292 #define kmem_alloc(_s, _f) umem_alloc(_s, _f) 293 #define kmem_zalloc(_s, _f) umem_zalloc(_s, _f) 294 #define kmem_free(_b, _s) umem_free(_b, _s) 295 #define kmem_cache_create(_a, _b, _c, _d, _e, _f, _g, _h, _i) \ 296 umem_cache_create(_a, _b, _c, _d, _e, _f, _g, _h, _i) 297 #define kmem_cache_destroy(_c) umem_cache_destroy(_c) 298 #define kmem_cache_alloc(_c, _f) umem_cache_alloc(_c, _f) 299 #define kmem_cache_free(_c, _b) umem_cache_free(_c, _b) 300 #define kmem_debugging() 0 301 #define kmem_cache_reap_now(_c) /* nothing */ 302 #define kmem_cache_set_move(_c, _cb) /* nothing */ 303 #define vmem_qcache_reap(_v) /* nothing */ 304 #define POINTER_INVALIDATE(_pp) /* nothing */ 305 #define POINTER_IS_VALID(_p) 0 306 307 extern vmem_t *zio_arena; 308 309 typedef umem_cache_t kmem_cache_t; 310 311 typedef enum kmem_cbrc { 312 KMEM_CBRC_YES, 313 KMEM_CBRC_NO, 314 KMEM_CBRC_LATER, 315 KMEM_CBRC_DONT_NEED, 316 KMEM_CBRC_DONT_KNOW 317 } kmem_cbrc_t; 318 319 /* 320 * Task queues 321 */ 322 typedef struct taskq taskq_t; 323 typedef uintptr_t taskqid_t; 324 typedef void (task_func_t)(void *); 325 326 typedef struct taskq_ent { 327 struct taskq_ent *tqent_next; 328 struct taskq_ent *tqent_prev; 329 task_func_t *tqent_func; 330 void *tqent_arg; 331 uintptr_t tqent_flags; 332 } taskq_ent_t; 333 334 #define TQENT_FLAG_PREALLOC 0x1 /* taskq_dispatch_ent used */ 335 336 #define TASKQ_PREPOPULATE 0x0001 337 #define TASKQ_CPR_SAFE 0x0002 /* Use CPR safe protocol */ 338 #define TASKQ_DYNAMIC 0x0004 /* Use dynamic thread scheduling */ 339 #define TASKQ_THREADS_CPU_PCT 0x0008 /* Scale # threads by # cpus */ 340 #define TASKQ_DC_BATCH 0x0010 /* Mark threads as batch */ 341 342 #define TQ_SLEEP KM_SLEEP /* Can block for memory */ 343 #define TQ_NOSLEEP KM_NOSLEEP /* cannot block for memory; may fail */ 344 #define TQ_NOQUEUE 0x02 /* Do not enqueue if can't dispatch */ 345 #define TQ_FRONT 0x08 /* Queue in front */ 346 347 348 extern taskq_t *system_taskq; 349 350 extern taskq_t *taskq_create(const char *, int, pri_t, int, int, uint_t); 351 #define taskq_create_proc(a, b, c, d, e, p, f) \ 352 (taskq_create(a, b, c, d, e, f)) 353 #define taskq_create_sysdc(a, b, d, e, p, dc, f) \ 354 (taskq_create(a, b, maxclsyspri, d, e, f)) 355 extern taskqid_t taskq_dispatch(taskq_t *, task_func_t, void *, uint_t); 356 extern void taskq_dispatch_ent(taskq_t *, task_func_t, void *, uint_t, 357 taskq_ent_t *); 358 extern void taskq_destroy(taskq_t *); 359 extern void taskq_wait(taskq_t *); 360 extern int taskq_member(taskq_t *, void *); 361 extern void system_taskq_init(void); 362 extern void system_taskq_fini(void); 363 364 #define XVA_MAPSIZE 3 365 #define XVA_MAGIC 0x78766174 366 367 /* 368 * vnodes 369 */ 370 typedef struct vnode { 371 uint64_t v_size; 372 int v_fd; 373 char *v_path; 374 } vnode_t; 375 376 #define AV_SCANSTAMP_SZ 32 /* length of anti-virus scanstamp */ 377 378 typedef struct xoptattr { 379 timestruc_t xoa_createtime; /* Create time of file */ 380 uint8_t xoa_archive; 381 uint8_t xoa_system; 382 uint8_t xoa_readonly; 383 uint8_t xoa_hidden; 384 uint8_t xoa_nounlink; 385 uint8_t xoa_immutable; 386 uint8_t xoa_appendonly; 387 uint8_t xoa_nodump; 388 uint8_t xoa_settable; 389 uint8_t xoa_opaque; 390 uint8_t xoa_av_quarantined; 391 uint8_t xoa_av_modified; 392 uint8_t xoa_av_scanstamp[AV_SCANSTAMP_SZ]; 393 uint8_t xoa_reparse; 394 uint8_t xoa_offline; 395 uint8_t xoa_sparse; 396 } xoptattr_t; 397 398 typedef struct vattr { 399 uint_t va_mask; /* bit-mask of attributes */ 400 u_offset_t va_size; /* file size in bytes */ 401 } vattr_t; 402 403 404 typedef struct xvattr { 405 vattr_t xva_vattr; /* Embedded vattr structure */ 406 uint32_t xva_magic; /* Magic Number */ 407 uint32_t xva_mapsize; /* Size of attr bitmap (32-bit words) */ 408 uint32_t *xva_rtnattrmapp; /* Ptr to xva_rtnattrmap[] */ 409 uint32_t xva_reqattrmap[XVA_MAPSIZE]; /* Requested attrs */ 410 uint32_t xva_rtnattrmap[XVA_MAPSIZE]; /* Returned attrs */ 411 xoptattr_t xva_xoptattrs; /* Optional attributes */ 412 } xvattr_t; 413 414 typedef struct vsecattr { 415 uint_t vsa_mask; /* See below */ 416 int vsa_aclcnt; /* ACL entry count */ 417 void *vsa_aclentp; /* pointer to ACL entries */ 418 int vsa_dfaclcnt; /* default ACL entry count */ 419 void *vsa_dfaclentp; /* pointer to default ACL entries */ 420 size_t vsa_aclentsz; /* ACE size in bytes of vsa_aclentp */ 421 } vsecattr_t; 422 423 #define AT_TYPE 0x00001 424 #define AT_MODE 0x00002 425 #define AT_UID 0x00004 426 #define AT_GID 0x00008 427 #define AT_FSID 0x00010 428 #define AT_NODEID 0x00020 429 #define AT_NLINK 0x00040 430 #define AT_SIZE 0x00080 431 #define AT_ATIME 0x00100 432 #define AT_MTIME 0x00200 433 #define AT_CTIME 0x00400 434 #define AT_RDEV 0x00800 435 #define AT_BLKSIZE 0x01000 436 #define AT_NBLOCKS 0x02000 437 #define AT_SEQ 0x08000 438 #define AT_XVATTR 0x10000 439 440 #define CRCREAT 0 441 442 extern int fop_getattr(vnode_t *vp, vattr_t *vap); 443 444 #define VOP_CLOSE(vp, f, c, o, cr, ct) 0 445 #define VOP_PUTPAGE(vp, of, sz, fl, cr, ct) 0 446 #define VOP_GETATTR(vp, vap, fl, cr, ct) fop_getattr((vp), (vap)); 447 448 #define VOP_FSYNC(vp, f, cr, ct) fsync((vp)->v_fd) 449 450 #define VN_RELE(vp) vn_close(vp) 451 452 extern int vn_open(char *path, int x1, int oflags, int mode, vnode_t **vpp, 453 int x2, int x3); 454 extern int vn_openat(char *path, int x1, int oflags, int mode, vnode_t **vpp, 455 int x2, int x3, vnode_t *vp, int fd); 456 extern int vn_rdwr(int uio, vnode_t *vp, void *addr, ssize_t len, 457 offset_t offset, int x1, int x2, rlim64_t x3, void *x4, ssize_t *residp); 458 extern void vn_close(vnode_t *vp); 459 460 #define vn_remove(path, x1, x2) remove(path) 461 #define vn_rename(from, to, seg) rename((from), (to)) 462 #define vn_is_readonly(vp) B_FALSE 463 464 extern vnode_t *rootdir; 465 466 #include <sys/file.h> /* for FREAD, FWRITE, etc */ 467 468 /* 469 * Random stuff 470 */ 471 #define ddi_get_lbolt() (gethrtime() >> 23) 472 #define ddi_get_lbolt64() (gethrtime() >> 23) 473 #define hz 119 /* frequency when using gethrtime() >> 23 for lbolt */ 474 475 extern void delay(clock_t ticks); 476 477 #define SEC_TO_TICK(sec) ((sec) * hz) 478 #define NSEC_TO_TICK(usec) ((usec) / (NANOSEC / hz)) 479 480 #define gethrestime_sec() time(NULL) 481 #define gethrestime(t) \ 482 do {\ 483 (t)->tv_sec = gethrestime_sec();\ 484 (t)->tv_nsec = 0;\ 485 } while (0); 486 487 #define max_ncpus 64 488 489 #define minclsyspri 60 490 #define maxclsyspri 99 491 492 #define CPU_SEQID (thr_self() & (max_ncpus - 1)) 493 494 #define kcred NULL 495 #define CRED() NULL 496 497 #define ptob(x) ((x) * PAGESIZE) 498 499 extern uint64_t physmem; 500 501 extern int highbit(ulong_t i); 502 extern int random_get_bytes(uint8_t *ptr, size_t len); 503 extern int random_get_pseudo_bytes(uint8_t *ptr, size_t len); 504 505 extern void kernel_init(int); 506 extern void kernel_fini(void); 507 508 struct spa; 509 extern void nicenum(uint64_t num, char *buf); 510 extern void show_pool_stats(struct spa *); 511 512 typedef struct callb_cpr { 513 kmutex_t *cc_lockp; 514 } callb_cpr_t; 515 516 #define CALLB_CPR_INIT(cp, lockp, func, name) { \ 517 (cp)->cc_lockp = lockp; \ 518 } 519 520 #define CALLB_CPR_SAFE_BEGIN(cp) { \ 521 ASSERT(MUTEX_HELD((cp)->cc_lockp)); \ 522 } 523 524 #define CALLB_CPR_SAFE_END(cp, lockp) { \ 525 ASSERT(MUTEX_HELD((cp)->cc_lockp)); \ 526 } 527 528 #define CALLB_CPR_EXIT(cp) { \ 529 ASSERT(MUTEX_HELD((cp)->cc_lockp)); \ 530 mutex_exit((cp)->cc_lockp); \ 531 } 532 533 #define zone_dataset_visible(x, y) (1) 534 #define INGLOBALZONE(z) (1) 535 536 extern char *kmem_asprintf(const char *fmt, ...); 537 #define strfree(str) kmem_free((str), strlen(str) + 1) 538 539 /* 540 * Hostname information 541 */ 542 extern char hw_serial[]; /* for userland-emulated hostid access */ 543 extern int ddi_strtoul(const char *str, char **nptr, int base, 544 unsigned long *result); 545 546 extern int ddi_strtoull(const char *str, char **nptr, int base, 547 u_longlong_t *result); 548 549 /* ZFS Boot Related stuff. */ 550 551 struct _buf { 552 intptr_t _fd; 553 }; 554 555 struct bootstat { 556 uint64_t st_size; 557 }; 558 559 typedef struct ace_object { 560 uid_t a_who; 561 uint32_t a_access_mask; 562 uint16_t a_flags; 563 uint16_t a_type; 564 uint8_t a_obj_type[16]; 565 uint8_t a_inherit_obj_type[16]; 566 } ace_object_t; 567 568 569 #define ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE 0x05 570 #define ACE_ACCESS_DENIED_OBJECT_ACE_TYPE 0x06 571 #define ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE 0x07 572 #define ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE 0x08 573 574 extern struct _buf *kobj_open_file(char *name); 575 extern int kobj_read_file(struct _buf *file, char *buf, unsigned size, 576 unsigned off); 577 extern void kobj_close_file(struct _buf *file); 578 extern int kobj_get_filesize(struct _buf *file, uint64_t *size); 579 extern int zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr); 580 extern int zfs_secpolicy_rename_perms(const char *from, const char *to, 581 cred_t *cr); 582 extern int zfs_secpolicy_destroy_perms(const char *name, cred_t *cr); 583 extern zoneid_t getzoneid(void); 584 585 /* SID stuff */ 586 typedef struct ksiddomain { 587 uint_t kd_ref; 588 uint_t kd_len; 589 char *kd_name; 590 } ksiddomain_t; 591 592 ksiddomain_t *ksid_lookupdomain(const char *); 593 void ksiddomain_rele(ksiddomain_t *); 594 595 #define DDI_SLEEP KM_SLEEP 596 #define ddi_log_sysevent(_a, _b, _c, _d, _e, _f, _g) \ 597 sysevent_post_event(_c, _d, _b, "libzpool", _e, _f) 598 599 /* 600 * Cyclic information 601 */ 602 extern kmutex_t cpu_lock; 603 604 typedef uintptr_t cyclic_id_t; 605 typedef uint16_t cyc_level_t; 606 typedef void (*cyc_func_t)(void *); 607 608 #define CY_LOW_LEVEL 0 609 #define CY_INFINITY INT64_MAX 610 #define CYCLIC_NONE ((cyclic_id_t)0) 611 612 typedef struct cyc_time { 613 hrtime_t cyt_when; 614 hrtime_t cyt_interval; 615 } cyc_time_t; 616 617 typedef struct cyc_handler { 618 cyc_func_t cyh_func; 619 void *cyh_arg; 620 cyc_level_t cyh_level; 621 } cyc_handler_t; 622 623 extern cyclic_id_t cyclic_add(cyc_handler_t *, cyc_time_t *); 624 extern void cyclic_remove(cyclic_id_t); 625 extern int cyclic_reprogram(cyclic_id_t, hrtime_t); 626 627 /* 628 * Buf structure 629 */ 630 #define B_BUSY 0x0001 631 #define B_DONE 0x0002 632 #define B_ERROR 0x0004 633 #define B_READ 0x0040 /* read when I/O occurs */ 634 #define B_WRITE 0x0100 /* non-read pseudo-flag */ 635 636 typedef struct buf { 637 int b_flags; 638 size_t b_bcount; 639 union { 640 caddr_t b_addr; 641 } b_un; 642 643 lldaddr_t _b_blkno; 644 #define b_lblkno _b_blkno._f 645 size_t b_resid; 646 size_t b_bufsize; 647 int (*b_iodone)(struct buf *); 648 int b_error; 649 void *b_private; 650 } buf_t; 651 652 extern void bioinit(buf_t *); 653 extern void biodone(buf_t *); 654 extern void bioerror(buf_t *, int); 655 extern int geterror(buf_t *); 656 657 #ifdef __cplusplus 658 } 659 #endif 660 661 #endif /* _SYS_ZFS_CONTEXT_H */ 662