xref: /illumos-gate/usr/src/lib/libzpool/common/sys/zfs_context.h (revision 0689f76c08c5e553ff25ac43a852b56c430bb61e)
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