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Fix inflated load average
[mirror_zfs.git] / include / sys / zfs_context.h
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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/*
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22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
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24 */
25
26#ifndef _SYS_ZFS_CONTEXT_H
27#define _SYS_ZFS_CONTEXT_H
28
e37e1d30 29#ifdef __KERNEL__
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30
31#include <sys/note.h>
32#include <sys/types.h>
33#include <sys/t_lock.h>
34#include <sys/atomic.h>
35#include <sys/sysmacros.h>
36#include <sys/bitmap.h>
37#include <sys/cmn_err.h>
38#include <sys/kmem.h>
39#include <sys/taskq.h>
40#include <sys/buf.h>
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/cpuvar.h>
44#include <sys/kobj.h>
45#include <sys/conf.h>
46#include <sys/disp.h>
47#include <sys/debug.h>
48#include <sys/random.h>
49#include <sys/byteorder.h>
50#include <sys/systm.h>
51#include <sys/list.h>
590329b5 52#include <sys/uio_impl.h>
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53#include <sys/dirent.h>
54#include <sys/time.h>
55#include <vm/seg_kmem.h>
56#include <sys/zone.h>
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57#include <sys/zfs_debug.h>
58#include <sys/fm/fs/zfs.h>
59#include <sys/sunddi.h>
8299a1f4 60#include <linux/dcache_compat.h>
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61
62#else /* _KERNEL */
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63
64#define _SYS_MUTEX_H
65#define _SYS_RWLOCK_H
66#define _SYS_CONDVAR_H
67#define _SYS_SYSTM_H
68#define _SYS_DEBUG_H
69#define _SYS_T_LOCK_H
70#define _SYS_VNODE_H
71#define _SYS_VFS_H
72#define _SYS_SUNDDI_H
73#define _SYS_CALLB_H
74
75#include <stdio.h>
76#include <stdlib.h>
77#include <stddef.h>
78#include <stdarg.h>
79#include <fcntl.h>
80#include <unistd.h>
81#include <errno.h>
82#include <string.h>
83#include <strings.h>
1e33ac1e 84#include <pthread.h>
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85#include <assert.h>
86#include <alloca.h>
87#include <umem.h>
88#include <limits.h>
89#include <atomic.h>
90#include <dirent.h>
91#include <time.h>
92#include <sys/note.h>
93#include <sys/types.h>
94#include <sys/cred.h>
95#include <sys/sysmacros.h>
96#include <sys/bitmap.h>
97#include <sys/resource.h>
98#include <sys/byteorder.h>
99#include <sys/list.h>
100#include <sys/uio.h>
101#include <sys/zfs_debug.h>
102#include <sys/sdt.h>
103#include <sys/kstat.h>
104#include <sys/u8_textprep.h>
26685276 105#include <sys/fm/fs/zfs.h>
428870ff 106#include <sys/sunddi.h>
77755a57 107
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108/*
109 * Stack
110 */
111
112#define noinline __attribute__((noinline))
113
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114/*
115 * Debugging
116 */
117
118/*
119 * Note that we are not using the debugging levels.
120 */
121
122#define CE_CONT 0 /* continuation */
123#define CE_NOTE 1 /* notice */
124#define CE_WARN 2 /* warning */
125#define CE_PANIC 3 /* panic */
126#define CE_IGNORE 4 /* print nothing */
127
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128extern int aok;
129
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130/*
131 * ZFS debugging
132 */
133
134#ifdef ZFS_DEBUG
135extern void dprintf_setup(int *argc, char **argv);
136#endif /* ZFS_DEBUG */
137
138extern void cmn_err(int, const char *, ...);
139extern void vcmn_err(int, const char *, __va_list);
140extern void panic(const char *, ...);
141extern void vpanic(const char *, __va_list);
142
143#define fm_panic panic
144
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145/*
146 * DTrace SDT probes have different signatures in userland than they do in
147 * kernel. If they're being used in kernel code, re-define them out of
148 * existence for their counterparts in libzpool.
149 */
150
151#ifdef DTRACE_PROBE
152#undef DTRACE_PROBE
153#define DTRACE_PROBE(a) ((void)0)
154#endif /* DTRACE_PROBE */
155
156#ifdef DTRACE_PROBE1
157#undef DTRACE_PROBE1
158#define DTRACE_PROBE1(a, b, c) ((void)0)
159#endif /* DTRACE_PROBE1 */
160
161#ifdef DTRACE_PROBE2
162#undef DTRACE_PROBE2
163#define DTRACE_PROBE2(a, b, c, d, e) ((void)0)
164#endif /* DTRACE_PROBE2 */
165
166#ifdef DTRACE_PROBE3
167#undef DTRACE_PROBE3
168#define DTRACE_PROBE3(a, b, c, d, e, f, g) ((void)0)
169#endif /* DTRACE_PROBE3 */
170
171#ifdef DTRACE_PROBE4
172#undef DTRACE_PROBE4
173#define DTRACE_PROBE4(a, b, c, d, e, f, g, h, i) ((void)0)
174#endif /* DTRACE_PROBE4 */
175
176/*
177 * Threads
178 */
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179#define TS_MAGIC 0x72f158ab4261e538ull
180#define TS_RUN 0x00000002
181#ifdef __linux__
182#define STACK_SIZE 8192 /* Linux x86 and amd64 */
183#else
184#define STACK_SIZE 24576 /* Solaris */
185#endif
428870ff 186
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187#ifdef NPTL_GUARD_WITHIN_STACK
188#define EXTRA_GUARD_BYTES PAGESIZE
189#else
190#define EXTRA_GUARD_BYTES 0
191#endif
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192
193/* in libzpool, p0 exists only to have its address taken */
1e33ac1e 194typedef struct proc {
428870ff 195 uintptr_t this_is_never_used_dont_dereference_it;
1e33ac1e 196} proc_t;
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197
198extern struct proc p0;
199
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200typedef void (*thread_func_t)(void *);
201typedef void (*thread_func_arg_t)(void *);
202typedef pthread_t kt_did_t;
203
204typedef struct kthread {
205 kt_did_t t_tid;
206 thread_func_t t_func;
207 void * t_arg;
208} kthread_t;
77755a57 209
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210#define tsd_get(key) pthread_getspecific(key)
211#define tsd_set(key, val) pthread_setspecific(key, val)
212#define curthread zk_thread_current()
213#define thread_exit zk_thread_exit
214#define thread_create(stk, stksize, func, arg, len, pp, state, pri) \
215 zk_thread_create(stk, stksize, (thread_func_t)func, arg, \
216 len, NULL, state, pri)
217#define thread_join(t) zk_thread_join(t)
218#define newproc(f,a,cid,pri,ctp,pid) (ENOSYS)
219
220extern kthread_t *zk_thread_current(void);
221extern void zk_thread_exit(void);
222extern kthread_t *zk_thread_create(caddr_t stk, size_t stksize,
223 thread_func_t func, void *arg, size_t len,
224 proc_t *pp, int state, pri_t pri);
225extern void zk_thread_join(kt_did_t tid);
226
227#define PS_NONE -1
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228
229#define issig(why) (FALSE)
230#define ISSIG(thr, why) (FALSE)
231
232/*
233 * Mutexes
234 */
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235#define MTX_MAGIC 0x9522f51362a6e326ull
236#define MTX_INIT ((void *)NULL)
237#define MTX_DEST ((void *)-1UL)
238
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239typedef struct kmutex {
240 void *m_owner;
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241 uint64_t m_magic;
242 pthread_mutex_t m_lock;
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243} kmutex_t;
244
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245#define MUTEX_DEFAULT 0
246#define MUTEX_HELD(m) ((m)->m_owner == curthread)
572e2857 247#define MUTEX_NOT_HELD(m) (!MUTEX_HELD(m))
77755a57 248
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249extern void mutex_init(kmutex_t *mp, char *name, int type, void *cookie);
250extern void mutex_destroy(kmutex_t *mp);
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251extern void mutex_enter(kmutex_t *mp);
252extern void mutex_exit(kmutex_t *mp);
253extern int mutex_tryenter(kmutex_t *mp);
254extern void *mutex_owner(kmutex_t *mp);
1e33ac1e 255extern int mutex_held(kmutex_t *mp);
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256
257/*
258 * RW locks
259 */
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260#define RW_MAGIC 0x4d31fb123648e78aull
261#define RW_INIT ((void *)NULL)
262#define RW_DEST ((void *)-1UL)
263
77755a57 264typedef struct krwlock {
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265 void *rw_owner;
266 void *rw_wr_owner;
267 uint64_t rw_magic;
268 pthread_rwlock_t rw_lock;
269 uint_t rw_readers;
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270} krwlock_t;
271
272typedef int krw_t;
273
274#define RW_READER 0
275#define RW_WRITER 1
1e33ac1e 276#define RW_DEFAULT RW_READER
77755a57 277
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278#define RW_READ_HELD(x) ((x)->rw_readers > 0)
279#define RW_WRITE_HELD(x) ((x)->rw_wr_owner == curthread)
280#define RW_LOCK_HELD(x) (RW_READ_HELD(x) || RW_WRITE_HELD(x))
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281
282extern void rw_init(krwlock_t *rwlp, char *name, int type, void *arg);
283extern void rw_destroy(krwlock_t *rwlp);
284extern void rw_enter(krwlock_t *rwlp, krw_t rw);
285extern int rw_tryenter(krwlock_t *rwlp, krw_t rw);
286extern int rw_tryupgrade(krwlock_t *rwlp);
287extern void rw_exit(krwlock_t *rwlp);
288#define rw_downgrade(rwlp) do { } while (0)
289
290extern uid_t crgetuid(cred_t *cr);
291extern gid_t crgetgid(cred_t *cr);
292extern int crgetngroups(cred_t *cr);
293extern gid_t *crgetgroups(cred_t *cr);
294
295/*
296 * Condition variables
297 */
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298#define CV_MAGIC 0xd31ea9a83b1b30c4ull
299
300typedef struct kcondvar {
301 uint64_t cv_magic;
302 pthread_cond_t cv;
303} kcondvar_t;
77755a57 304
1e33ac1e 305#define CV_DEFAULT 0
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306
307extern void cv_init(kcondvar_t *cv, char *name, int type, void *arg);
308extern void cv_destroy(kcondvar_t *cv);
309extern void cv_wait(kcondvar_t *cv, kmutex_t *mp);
310extern clock_t cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime);
311extern void cv_signal(kcondvar_t *cv);
312extern void cv_broadcast(kcondvar_t *cv);
5b63b3eb 313#define cv_timedwait_interruptible(cv, mp, at) cv_timedwait(cv, mp, at);
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314
315/*
316 * kstat creation, installation and deletion
317 */
318extern kstat_t *kstat_create(char *, int,
319 char *, char *, uchar_t, ulong_t, uchar_t);
320extern void kstat_install(kstat_t *);
321extern void kstat_delete(kstat_t *);
322
323/*
324 * Kernel memory
325 */
326#define KM_SLEEP UMEM_NOFAIL
327#define KM_PUSHPAGE KM_SLEEP
328#define KM_NOSLEEP UMEM_DEFAULT
00b46022 329#define KM_NODEBUG 0x0
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330#define KMC_NODEBUG UMC_NODEBUG
331#define kmem_alloc(_s, _f) umem_alloc(_s, _f)
332#define kmem_zalloc(_s, _f) umem_zalloc(_s, _f)
333#define kmem_free(_b, _s) umem_free(_b, _s)
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334#define vmem_alloc(_s, _f) kmem_alloc(_s, _f)
335#define vmem_zalloc(_s, _f) kmem_zalloc(_s, _f)
336#define vmem_free(_b, _s) kmem_free(_b, _s)
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337#define kmem_cache_create(_a, _b, _c, _d, _e, _f, _g, _h, _i) \
338 umem_cache_create(_a, _b, _c, _d, _e, _f, _g, _h, _i)
339#define kmem_cache_destroy(_c) umem_cache_destroy(_c)
340#define kmem_cache_alloc(_c, _f) umem_cache_alloc(_c, _f)
341#define kmem_cache_free(_c, _b) umem_cache_free(_c, _b)
342#define kmem_debugging() 0
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343#define kmem_cache_reap_now(_c) /* nothing */
344#define kmem_cache_set_move(_c, _cb) /* nothing */
345#define POINTER_INVALIDATE(_pp) /* nothing */
346#define POINTER_IS_VALID(_p) 0
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347
348typedef umem_cache_t kmem_cache_t;
349
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350typedef enum kmem_cbrc {
351 KMEM_CBRC_YES,
352 KMEM_CBRC_NO,
353 KMEM_CBRC_LATER,
354 KMEM_CBRC_DONT_NEED,
355 KMEM_CBRC_DONT_KNOW
356} kmem_cbrc_t;
357
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358/*
359 * Task queues
360 */
361typedef struct taskq taskq_t;
362typedef uintptr_t taskqid_t;
363typedef void (task_func_t)(void *);
364
365#define TASKQ_PREPOPULATE 0x0001
366#define TASKQ_CPR_SAFE 0x0002 /* Use CPR safe protocol */
367#define TASKQ_DYNAMIC 0x0004 /* Use dynamic thread scheduling */
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368#define TASKQ_THREADS_CPU_PCT 0x0008 /* Scale # threads by # cpus */
369#define TASKQ_DC_BATCH 0x0010 /* Mark threads as batch */
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370
371#define TQ_SLEEP KM_SLEEP /* Can block for memory */
372#define TQ_NOSLEEP KM_NOSLEEP /* cannot block for memory; may fail */
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373#define TQ_NOQUEUE 0x02 /* Do not enqueue if can't dispatch */
374#define TQ_FRONT 0x08 /* Queue in front */
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375
376extern taskq_t *system_taskq;
377
378extern taskq_t *taskq_create(const char *, int, pri_t, int, int, uint_t);
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379#define taskq_create_proc(a, b, c, d, e, p, f) \
380 (taskq_create(a, b, c, d, e, f))
381#define taskq_create_sysdc(a, b, d, e, p, dc, f) \
382 (taskq_create(a, b, maxclsyspri, d, e, f))
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383extern taskqid_t taskq_dispatch(taskq_t *, task_func_t, void *, uint_t);
384extern void taskq_destroy(taskq_t *);
385extern void taskq_wait(taskq_t *);
1e33ac1e 386extern int taskq_member(taskq_t *, kthread_t *);
77755a57 387extern void system_taskq_init(void);
428870ff 388extern void system_taskq_fini(void);
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389
390#define XVA_MAPSIZE 3
391#define XVA_MAGIC 0x78766174
392
393/*
394 * vnodes
395 */
396typedef struct vnode {
397 uint64_t v_size;
398 int v_fd;
399 char *v_path;
400} vnode_t;
401
428870ff 402#define AV_SCANSTAMP_SZ 32 /* length of anti-virus scanstamp */
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403
404typedef struct xoptattr {
405 timestruc_t xoa_createtime; /* Create time of file */
406 uint8_t xoa_archive;
407 uint8_t xoa_system;
408 uint8_t xoa_readonly;
409 uint8_t xoa_hidden;
410 uint8_t xoa_nounlink;
411 uint8_t xoa_immutable;
412 uint8_t xoa_appendonly;
413 uint8_t xoa_nodump;
414 uint8_t xoa_settable;
415 uint8_t xoa_opaque;
416 uint8_t xoa_av_quarantined;
417 uint8_t xoa_av_modified;
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418 uint8_t xoa_av_scanstamp[AV_SCANSTAMP_SZ];
419 uint8_t xoa_reparse;
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420 uint8_t xoa_offline;
421 uint8_t xoa_sparse;
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422} xoptattr_t;
423
424typedef struct vattr {
425 uint_t va_mask; /* bit-mask of attributes */
426 u_offset_t va_size; /* file size in bytes */
427} vattr_t;
428
429
430typedef struct xvattr {
431 vattr_t xva_vattr; /* Embedded vattr structure */
432 uint32_t xva_magic; /* Magic Number */
433 uint32_t xva_mapsize; /* Size of attr bitmap (32-bit words) */
434 uint32_t *xva_rtnattrmapp; /* Ptr to xva_rtnattrmap[] */
435 uint32_t xva_reqattrmap[XVA_MAPSIZE]; /* Requested attrs */
436 uint32_t xva_rtnattrmap[XVA_MAPSIZE]; /* Returned attrs */
437 xoptattr_t xva_xoptattrs; /* Optional attributes */
438} xvattr_t;
439
440typedef struct vsecattr {
441 uint_t vsa_mask; /* See below */
442 int vsa_aclcnt; /* ACL entry count */
443 void *vsa_aclentp; /* pointer to ACL entries */
444 int vsa_dfaclcnt; /* default ACL entry count */
445 void *vsa_dfaclentp; /* pointer to default ACL entries */
446 size_t vsa_aclentsz; /* ACE size in bytes of vsa_aclentp */
447} vsecattr_t;
448
449#define AT_TYPE 0x00001
450#define AT_MODE 0x00002
451#define AT_UID 0x00004
452#define AT_GID 0x00008
453#define AT_FSID 0x00010
454#define AT_NODEID 0x00020
455#define AT_NLINK 0x00040
456#define AT_SIZE 0x00080
457#define AT_ATIME 0x00100
458#define AT_MTIME 0x00200
459#define AT_CTIME 0x00400
460#define AT_RDEV 0x00800
461#define AT_BLKSIZE 0x01000
462#define AT_NBLOCKS 0x02000
463#define AT_SEQ 0x08000
464#define AT_XVATTR 0x10000
465
466#define CRCREAT 0
467
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468extern int fop_getattr(vnode_t *vp, vattr_t *vap);
469
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470#define VOP_CLOSE(vp, f, c, o, cr, ct) 0
471#define VOP_PUTPAGE(vp, of, sz, fl, cr, ct) 0
428870ff 472#define VOP_GETATTR(vp, vap, fl, cr, ct) fop_getattr((vp), (vap));
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473
474#define VOP_FSYNC(vp, f, cr, ct) fsync((vp)->v_fd)
475
476#define VN_RELE(vp) vn_close(vp)
477
478extern int vn_open(char *path, int x1, int oflags, int mode, vnode_t **vpp,
479 int x2, int x3);
480extern int vn_openat(char *path, int x1, int oflags, int mode, vnode_t **vpp,
481 int x2, int x3, vnode_t *vp, int fd);
482extern int vn_rdwr(int uio, vnode_t *vp, void *addr, ssize_t len,
483 offset_t offset, int x1, int x2, rlim64_t x3, void *x4, ssize_t *residp);
484extern void vn_close(vnode_t *vp);
485
486#define vn_remove(path, x1, x2) remove(path)
487#define vn_rename(from, to, seg) rename((from), (to))
488#define vn_is_readonly(vp) B_FALSE
489
490extern vnode_t *rootdir;
491
492#include <sys/file.h> /* for FREAD, FWRITE, etc */
493
494/*
495 * Random stuff
496 */
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497#define ddi_get_lbolt() (gethrtime() >> 23)
498#define ddi_get_lbolt64() (gethrtime() >> 23)
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499#define hz 119 /* frequency when using gethrtime() >> 23 for lbolt */
500
501extern void delay(clock_t ticks);
502
503#define gethrestime_sec() time(NULL)
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504#define gethrestime(t) \
505 do {\
506 (t)->tv_sec = gethrestime_sec();\
507 (t)->tv_nsec = 0;\
508 } while (0);
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509
510#define max_ncpus 64
511
512#define minclsyspri 60
513#define maxclsyspri 99
514
1e33ac1e 515#define CPU_SEQID (pthread_self() & (max_ncpus - 1))
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516
517#define kcred NULL
518#define CRED() NULL
519
520#define ptob(x) ((x) * PAGESIZE)
521
522extern uint64_t physmem;
523
524extern int highbit(ulong_t i);
525extern int random_get_bytes(uint8_t *ptr, size_t len);
526extern int random_get_pseudo_bytes(uint8_t *ptr, size_t len);
527
528extern void kernel_init(int);
529extern void kernel_fini(void);
530
531struct spa;
532extern void nicenum(uint64_t num, char *buf);
533extern void show_pool_stats(struct spa *);
534
535typedef struct callb_cpr {
536 kmutex_t *cc_lockp;
537} callb_cpr_t;
538
539#define CALLB_CPR_INIT(cp, lockp, func, name) { \
540 (cp)->cc_lockp = lockp; \
541}
542
543#define CALLB_CPR_SAFE_BEGIN(cp) { \
544 ASSERT(MUTEX_HELD((cp)->cc_lockp)); \
545}
546
547#define CALLB_CPR_SAFE_END(cp, lockp) { \
548 ASSERT(MUTEX_HELD((cp)->cc_lockp)); \
549}
550
551#define CALLB_CPR_EXIT(cp) { \
552 ASSERT(MUTEX_HELD((cp)->cc_lockp)); \
553 mutex_exit((cp)->cc_lockp); \
554}
555
556#define zone_dataset_visible(x, y) (1)
557#define INGLOBALZONE(z) (1)
558
00b46022 559extern char *kmem_vasprintf(const char *fmt, va_list adx);
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560extern char *kmem_asprintf(const char *fmt, ...);
561#define strfree(str) kmem_free((str), strlen(str)+1)
562
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563/*
564 * Hostname information
565 */
d164b209 566extern char hw_serial[]; /* for userland-emulated hostid access */
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567extern int ddi_strtoul(const char *str, char **nptr, int base,
568 unsigned long *result);
569
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570extern int ddi_strtoull(const char *str, char **nptr, int base,
571 u_longlong_t *result);
572
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573/* ZFS Boot Related stuff. */
574
575struct _buf {
576 intptr_t _fd;
577};
578
579struct bootstat {
580 uint64_t st_size;
581};
582
583typedef struct ace_object {
584 uid_t a_who;
585 uint32_t a_access_mask;
586 uint16_t a_flags;
587 uint16_t a_type;
588 uint8_t a_obj_type[16];
589 uint8_t a_inherit_obj_type[16];
590} ace_object_t;
591
592
593#define ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE 0x05
594#define ACE_ACCESS_DENIED_OBJECT_ACE_TYPE 0x06
595#define ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE 0x07
596#define ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE 0x08
597
598extern struct _buf *kobj_open_file(char *name);
599extern int kobj_read_file(struct _buf *file, char *buf, unsigned size,
600 unsigned off);
601extern void kobj_close_file(struct _buf *file);
602extern int kobj_get_filesize(struct _buf *file, uint64_t *size);
603extern int zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr);
604extern int zfs_secpolicy_rename_perms(const char *from, const char *to,
605 cred_t *cr);
606extern int zfs_secpolicy_destroy_perms(const char *name, cred_t *cr);
607extern zoneid_t getzoneid(void);
608
609/* SID stuff */
610typedef struct ksiddomain {
611 uint_t kd_ref;
612 uint_t kd_len;
613 char *kd_name;
614} ksiddomain_t;
615
616ksiddomain_t *ksid_lookupdomain(const char *);
617void ksiddomain_rele(ksiddomain_t *);
618
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619#define DDI_SLEEP KM_SLEEP
620#define ddi_log_sysevent(_a, _b, _c, _d, _e, _f, _g) \
621 sysevent_post_event(_c, _d, _b, "libzpool", _e, _f)
622
6283f55e 623#endif /* _KERNEL */
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624
625#endif /* _SYS_ZFS_CONTEXT_H */