usr/src/lib/libzpool/common/sys/zfs_context.h

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