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dma: rework config parsing
[dragonfly.git] / sys / kern / vfs_aio.c
blob2b3cea458611ce8396f7af98a624be11182b22f7
1 /*
2 * Copyright (c) 1997 John S. Dyson. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. John S. Dyson's name may not be used to endorse or promote products
10 * derived from this software without specific prior written permission.
11 *
12 * DISCLAIMER: This code isn't warranted to do anything useful. Anything
13 * bad that happens because of using this software isn't the responsibility
14 * of the author. This software is distributed AS-IS.
15 *
16 * $FreeBSD: src/sys/kern/vfs_aio.c,v 1.70.2.28 2003/05/29 06:15:35 alc Exp $
17 * $DragonFly: src/sys/kern/vfs_aio.c,v 1.42 2007/07/20 17:21:52 dillon Exp $
18 */
19
20 /*
21 * This file contains support for the POSIX 1003.1B AIO/LIO facility.
22 */
23
24 #include <sys/param.h>
25 #include <sys/systm.h>
26 #include <sys/buf.h>
27 #include <sys/sysproto.h>
28 #include <sys/filedesc.h>
29 #include <sys/kernel.h>
30 #include <sys/fcntl.h>
31 #include <sys/file.h>
32 #include <sys/lock.h>
33 #include <sys/unistd.h>
34 #include <sys/proc.h>
35 #include <sys/resourcevar.h>
36 #include <sys/signalvar.h>
37 #include <sys/protosw.h>
38 #include <sys/socketvar.h>
39 #include <sys/sysctl.h>
40 #include <sys/vnode.h>
41 #include <sys/conf.h>
42 #include <sys/event.h>
43
44 #include <vm/vm.h>
45 #include <vm/vm_extern.h>
46 #include <vm/pmap.h>
47 #include <vm/vm_map.h>
48 #include <vm/vm_zone.h>
49 #include <sys/aio.h>
50 #include <sys/file2.h>
51 #include <sys/buf2.h>
52 #include <sys/sysref2.h>
53 #include <sys/thread2.h>
54
55 #include <machine/limits.h>
56 #include "opt_vfs_aio.h"
57
58 #ifdef VFS_AIO
59
60 /*
61 * Counter for allocating reference ids to new jobs. Wrapped to 1 on
62 * overflow.
63 */
64 static long jobrefid;
65
66 #define JOBST_NULL 0x0
67 #define JOBST_JOBQGLOBAL 0x2
68 #define JOBST_JOBRUNNING 0x3
69 #define JOBST_JOBFINISHED 0x4
70 #define JOBST_JOBQBUF 0x5
71 #define JOBST_JOBBFINISHED 0x6
72
73 #ifndef MAX_AIO_PER_PROC
74 #define MAX_AIO_PER_PROC 32
75 #endif
76
77 #ifndef MAX_AIO_QUEUE_PER_PROC
78 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */
79 #endif
80
81 #ifndef MAX_AIO_PROCS
82 #define MAX_AIO_PROCS 32
83 #endif
84
85 #ifndef MAX_AIO_QUEUE
86 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */
87 #endif
88
89 #ifndef TARGET_AIO_PROCS
90 #define TARGET_AIO_PROCS 4
91 #endif
92
93 #ifndef MAX_BUF_AIO
94 #define MAX_BUF_AIO 16
95 #endif
96
97 #ifndef AIOD_TIMEOUT_DEFAULT
98 #define AIOD_TIMEOUT_DEFAULT (10 * hz)
99 #endif
100
101 #ifndef AIOD_LIFETIME_DEFAULT
102 #define AIOD_LIFETIME_DEFAULT (30 * hz)
103 #endif
104
105 SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management");
106
107 static int max_aio_procs = MAX_AIO_PROCS;
108 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs,
109 CTLFLAG_RW, &max_aio_procs, 0,
110 "Maximum number of kernel threads to use for handling async IO");
111
112 static int num_aio_procs = 0;
113 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs,
114 CTLFLAG_RD, &num_aio_procs, 0,
115 "Number of presently active kernel threads for async IO");
116
117 /*
118 * The code will adjust the actual number of AIO processes towards this
119 * number when it gets a chance.
120 */
121 static int target_aio_procs = TARGET_AIO_PROCS;
122 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs,
123 0, "Preferred number of ready kernel threads for async IO");
124
125 static int max_queue_count = MAX_AIO_QUEUE;
126 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0,
127 "Maximum number of aio requests to queue, globally");
128
129 static int num_queue_count = 0;
130 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0,
131 "Number of queued aio requests");
132
133 static int num_buf_aio = 0;
134 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
135 "Number of aio requests presently handled by the buf subsystem");
136
137 /* Number of async I/O thread in the process of being started */
138 /* XXX This should be local to _aio_aqueue() */
139 static int num_aio_resv_start = 0;
140
141 static int aiod_timeout;
142 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0,
143 "Timeout value for synchronous aio operations");
144
145 static int aiod_lifetime;
146 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0,
147 "Maximum lifetime for idle aiod");
148
149 static int max_aio_per_proc = MAX_AIO_PER_PROC;
150 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
151 0, "Maximum active aio requests per process (stored in the process)");
152
153 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
154 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
155 &max_aio_queue_per_proc, 0,
156 "Maximum queued aio requests per process (stored in the process)");
157
158 static int max_buf_aio = MAX_BUF_AIO;
159 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
160 "Maximum buf aio requests per process (stored in the process)");
161
162 /*
163 * AIO process info
164 */
165 #define AIOP_FREE 0x1 /* proc on free queue */
166 #define AIOP_SCHED 0x2 /* proc explicitly scheduled */
167
168 struct aioproclist {
169 int aioprocflags; /* AIO proc flags */
170 TAILQ_ENTRY(aioproclist) list; /* List of processes */
171 struct proc *aioproc; /* The AIO thread */
172 };
173
174 /*
175 * data-structure for lio signal management
176 */
177 struct aio_liojob {
178 int lioj_flags;
179 int lioj_buffer_count;
180 int lioj_buffer_finished_count;
181 int lioj_queue_count;
182 int lioj_queue_finished_count;
183 struct sigevent lioj_signal; /* signal on all I/O done */
184 TAILQ_ENTRY(aio_liojob) lioj_list;
185 struct kaioinfo *lioj_ki;
186 };
187 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */
188 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */
189
190 /*
191 * per process aio data structure
192 */
193 struct kaioinfo {
194 int kaio_flags; /* per process kaio flags */
195 int kaio_maxactive_count; /* maximum number of AIOs */
196 int kaio_active_count; /* number of currently used AIOs */
197 int kaio_qallowed_count; /* maxiumu size of AIO queue */
198 int kaio_queue_count; /* size of AIO queue */
199 int kaio_ballowed_count; /* maximum number of buffers */
200 int kaio_queue_finished_count; /* number of daemon jobs finished */
201 int kaio_buffer_count; /* number of physio buffers */
202 int kaio_buffer_finished_count; /* count of I/O done */
203 struct proc *kaio_p; /* process that uses this kaio block */
204 TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */
205 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */
206 TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */
207 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */
208 TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */
209 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */
210 };
211
212 #define KAIO_RUNDOWN 0x1 /* process is being run down */
213 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */
214
215 static TAILQ_HEAD(,aioproclist) aio_freeproc, aio_activeproc;
216 static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */
217 static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */
218 static TAILQ_HEAD(,aiocblist) aio_freejobs; /* Pool of free jobs */
219
220 static void aio_init_aioinfo(struct proc *p);
221 static void aio_onceonly(void *);
222 static int aio_free_entry(struct aiocblist *aiocbe);
223 static void aio_process(struct aiocblist *aiocbe);
224 static int aio_newproc(void);
225 static int aio_aqueue(struct aiocb *job, int type);
226 static void aio_physwakeup(struct bio *bio);
227 static int aio_fphysio(struct aiocblist *aiocbe);
228 static int aio_qphysio(struct proc *p, struct aiocblist *iocb);
229 static void aio_daemon(void *uproc, struct trapframe *frame);
230 static void process_signal(void *aioj);
231
232 SYSINIT(aio, SI_SUB_VFS, SI_ORDER_ANY, aio_onceonly, NULL);
233
234 /*
235 * Zones for:
236 * kaio Per process async io info
237 * aiop async io thread data
238 * aiocb async io jobs
239 * aiol list io job pointer - internal to aio_suspend XXX
240 * aiolio list io jobs
241 */
242 static vm_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone;
243
244 /*
245 * Startup initialization
246 */
247 static void
248 aio_onceonly(void *na)
249 {
250 TAILQ_INIT(&aio_freeproc);
251 TAILQ_INIT(&aio_activeproc);
252 TAILQ_INIT(&aio_jobs);
253 TAILQ_INIT(&aio_bufjobs);
254 TAILQ_INIT(&aio_freejobs);
255 kaio_zone = zinit("AIO", sizeof(struct kaioinfo), 0, 0, 1);
256 aiop_zone = zinit("AIOP", sizeof(struct aioproclist), 0, 0, 1);
257 aiocb_zone = zinit("AIOCB", sizeof(struct aiocblist), 0, 0, 1);
258 aiol_zone = zinit("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t), 0, 0, 1);
259 aiolio_zone = zinit("AIOLIO", sizeof(struct aio_liojob), 0, 0, 1);
260 aiod_timeout = AIOD_TIMEOUT_DEFAULT;
261 aiod_lifetime = AIOD_LIFETIME_DEFAULT;
262 jobrefid = 1;
263 }
264
265 /*
266 * Init the per-process aioinfo structure. The aioinfo limits are set
267 * per-process for user limit (resource) management.
268 */
269 static void
270 aio_init_aioinfo(struct proc *p)
271 {
272 struct kaioinfo *ki;
273 if (p->p_aioinfo == NULL) {
274 ki = zalloc(kaio_zone);
275 p->p_aioinfo = ki;
276 ki->kaio_flags = 0;
277 ki->kaio_maxactive_count = max_aio_per_proc;
278 ki->kaio_active_count = 0;
279 ki->kaio_qallowed_count = max_aio_queue_per_proc;
280 ki->kaio_queue_count = 0;
281 ki->kaio_ballowed_count = max_buf_aio;
282 ki->kaio_buffer_count = 0;
283 ki->kaio_buffer_finished_count = 0;
284 ki->kaio_p = p;
285 TAILQ_INIT(&ki->kaio_jobdone);
286 TAILQ_INIT(&ki->kaio_jobqueue);
287 TAILQ_INIT(&ki->kaio_bufdone);
288 TAILQ_INIT(&ki->kaio_bufqueue);
289 TAILQ_INIT(&ki->kaio_liojoblist);
290 TAILQ_INIT(&ki->kaio_sockqueue);
291 }
292
293 while (num_aio_procs < target_aio_procs)
294 aio_newproc();
295 }
296
297 /*
298 * Free a job entry. Wait for completion if it is currently active, but don't
299 * delay forever. If we delay, we return a flag that says that we have to
300 * restart the queue scan.
301 */
302 static int
303 aio_free_entry(struct aiocblist *aiocbe)
304 {
305 struct kaioinfo *ki;
306 struct aio_liojob *lj;
307 struct proc *p;
308 int error;
309
310 if (aiocbe->jobstate == JOBST_NULL)
311 panic("aio_free_entry: freeing already free job");
312
313 p = aiocbe->userproc;
314 ki = p->p_aioinfo;
315 lj = aiocbe->lio;
316 if (ki == NULL)
317 panic("aio_free_entry: missing p->p_aioinfo");
318
319 while (aiocbe->jobstate == JOBST_JOBRUNNING) {
320 aiocbe->jobflags |= AIOCBLIST_RUNDOWN;
321 tsleep(aiocbe, 0, "jobwai", 0);
322 }
323 if (aiocbe->bp == NULL) {
324 if (ki->kaio_queue_count <= 0)
325 panic("aio_free_entry: process queue size <= 0");
326 if (num_queue_count <= 0)
327 panic("aio_free_entry: system wide queue size <= 0");
328
329 if (lj) {
330 lj->lioj_queue_count--;
331 if (aiocbe->jobflags & AIOCBLIST_DONE)
332 lj->lioj_queue_finished_count--;
333 }
334 ki->kaio_queue_count--;
335 if (aiocbe->jobflags & AIOCBLIST_DONE)
336 ki->kaio_queue_finished_count--;
337 num_queue_count--;
338 } else {
339 if (lj) {
340 lj->lioj_buffer_count--;
341 if (aiocbe->jobflags & AIOCBLIST_DONE)
342 lj->lioj_buffer_finished_count--;
343 }
344 if (aiocbe->jobflags & AIOCBLIST_DONE)
345 ki->kaio_buffer_finished_count--;
346 ki->kaio_buffer_count--;
347 num_buf_aio--;
348 }
349
350 /* aiocbe is going away, we need to destroy any knotes */
351 /* XXX lwp knote wants a thread, but only cares about the process */
352 knote_remove(FIRST_LWP_IN_PROC(p)->lwp_thread, &aiocbe->klist);
353
354 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN)
355 && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) {
356 ki->kaio_flags &= ~KAIO_WAKEUP;
357 wakeup(p);
358 }
359
360 if (aiocbe->jobstate == JOBST_JOBQBUF) {
361 if ((error = aio_fphysio(aiocbe)) != 0)
362 return error;
363 if (aiocbe->jobstate != JOBST_JOBBFINISHED)
364 panic("aio_free_entry: invalid physio finish-up state");
365 crit_enter();
366 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist);
367 crit_exit();
368 } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) {
369 crit_enter();
370 TAILQ_REMOVE(&aio_jobs, aiocbe, list);
371 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
372 crit_exit();
373 } else if (aiocbe->jobstate == JOBST_JOBFINISHED)
374 TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist);
375 else if (aiocbe->jobstate == JOBST_JOBBFINISHED) {
376 crit_enter();
377 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist);
378 crit_exit();
379 if (aiocbe->bp) {
380 vunmapbuf(aiocbe->bp);
381 relpbuf(aiocbe->bp, NULL);
382 aiocbe->bp = NULL;
383 }
384 }
385 if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) {
386 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
387 zfree(aiolio_zone, lj);
388 }
389 aiocbe->jobstate = JOBST_NULL;
390 callout_stop(&aiocbe->timeout);
391 fdrop(aiocbe->fd_file);
392 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
393 return 0;
394 }
395 #endif /* VFS_AIO */
396
397 /*
398 * Rundown the jobs for a given process.
399 */
400 void
401 aio_proc_rundown(struct proc *p)
402 {
403 #ifndef VFS_AIO
404 return;
405 #else
406 struct kaioinfo *ki;
407 struct aio_liojob *lj, *ljn;
408 struct aiocblist *aiocbe, *aiocbn;
409 struct file *fp;
410 struct socket *so;
411
412 ki = p->p_aioinfo;
413 if (ki == NULL)
414 return;
415
416 ki->kaio_flags |= LIOJ_SIGNAL_POSTED;
417 while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count >
418 ki->kaio_buffer_finished_count)) {
419 ki->kaio_flags |= KAIO_RUNDOWN;
420 if (tsleep(p, 0, "kaiowt", aiod_timeout))
421 break;
422 }
423
424 /*
425 * Move any aio ops that are waiting on socket I/O to the normal job
426 * queues so they are cleaned up with any others.
427 */
428 crit_enter();
429 for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe =
430 aiocbn) {
431 aiocbn = TAILQ_NEXT(aiocbe, plist);
432 fp = aiocbe->fd_file;
433 if (fp != NULL) {
434 so = (struct socket *)fp->f_data;
435 TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list);
436 if (TAILQ_EMPTY(&so->so_aiojobq)) {
437 so->so_snd.ssb_flags &= ~SSB_AIO;
438 so->so_rcv.ssb_flags &= ~SSB_AIO;
439 }
440 }
441 TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist);
442 TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list);
443 TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist);
444 }
445 crit_exit();
446
447 restart1:
448 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) {
449 aiocbn = TAILQ_NEXT(aiocbe, plist);
450 if (aio_free_entry(aiocbe))
451 goto restart1;
452 }
453
454 restart2:
455 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue); aiocbe; aiocbe =
456 aiocbn) {
457 aiocbn = TAILQ_NEXT(aiocbe, plist);
458 if (aio_free_entry(aiocbe))
459 goto restart2;
460 }
461
462 restart3:
463 crit_enter();
464 while (TAILQ_FIRST(&ki->kaio_bufqueue)) {
465 ki->kaio_flags |= KAIO_WAKEUP;
466 tsleep(p, 0, "aioprn", 0);
467 crit_exit();
468 goto restart3;
469 }
470 crit_exit();
471
472 restart4:
473 crit_enter();
474 for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) {
475 aiocbn = TAILQ_NEXT(aiocbe, plist);
476 if (aio_free_entry(aiocbe)) {
477 crit_exit();
478 goto restart4;
479 }
480 }
481 crit_exit();
482
483 /*
484 * If we've slept, jobs might have moved from one queue to another.
485 * Retry rundown if we didn't manage to empty the queues.
486 */
487 if (TAILQ_FIRST(&ki->kaio_jobdone) != NULL ||
488 TAILQ_FIRST(&ki->kaio_jobqueue) != NULL ||
489 TAILQ_FIRST(&ki->kaio_bufqueue) != NULL ||
490 TAILQ_FIRST(&ki->kaio_bufdone) != NULL)
491 goto restart1;
492
493 for (lj = TAILQ_FIRST(&ki->kaio_liojoblist); lj; lj = ljn) {
494 ljn = TAILQ_NEXT(lj, lioj_list);
495 if ((lj->lioj_buffer_count == 0) && (lj->lioj_queue_count ==
496 0)) {
497 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
498 zfree(aiolio_zone, lj);
499 } else {
500 #ifdef DIAGNOSTIC
501 kprintf("LIO job not cleaned up: B:%d, BF:%d, Q:%d, "
502 "QF:%d\n", lj->lioj_buffer_count,
503 lj->lioj_buffer_finished_count,
504 lj->lioj_queue_count,
505 lj->lioj_queue_finished_count);
506 #endif
507 }
508 }
509
510 zfree(kaio_zone, ki);
511 p->p_aioinfo = NULL;
512 #endif /* VFS_AIO */
513 }
514
515 #ifdef VFS_AIO
516 /*
517 * Select a job to run (called by an AIO daemon).
518 */
519 static struct aiocblist *
520 aio_selectjob(struct aioproclist *aiop)
521 {
522 struct aiocblist *aiocbe;
523 struct kaioinfo *ki;
524 struct proc *userp;
525
526 crit_enter();
527 for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe =
528 TAILQ_NEXT(aiocbe, list)) {
529 userp = aiocbe->userproc;
530 ki = userp->p_aioinfo;
531
532 if (ki->kaio_active_count < ki->kaio_maxactive_count) {
533 TAILQ_REMOVE(&aio_jobs, aiocbe, list);
534 crit_exit();
535 return aiocbe;
536 }
537 }
538 crit_exit();
539
540 return NULL;
541 }
542
543 /*
544 * The AIO processing activity. This is the code that does the I/O request for
545 * the non-physio version of the operations. The normal vn operations are used,
546 * and this code should work in all instances for every type of file, including
547 * pipes, sockets, fifos, and regular files.
548 */
549 static void
550 aio_process(struct aiocblist *aiocbe)
551 {
552 struct thread *mytd;
553 struct aiocb *cb;
554 struct file *fp;
555 struct uio auio;
556 struct iovec aiov;
557 int cnt;
558 int error;
559 int oublock_st, oublock_end;
560 int inblock_st, inblock_end;
561
562 mytd = curthread;
563 cb = &aiocbe->uaiocb;
564 fp = aiocbe->fd_file;
565
566 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
567 aiov.iov_len = cb->aio_nbytes;
568
569 auio.uio_iov = &aiov;
570 auio.uio_iovcnt = 1;
571 auio.uio_offset = cb->aio_offset;
572 auio.uio_resid = cb->aio_nbytes;
573 cnt = cb->aio_nbytes;
574 auio.uio_segflg = UIO_USERSPACE;
575 auio.uio_td = mytd;
576
577 inblock_st = mytd->td_lwp->lwp_ru.ru_inblock;
578 oublock_st = mytd->td_lwp->lwp_ru.ru_oublock;
579 /*
580 * _aio_aqueue() acquires a reference to the file that is
581 * released in aio_free_entry().
582 */
583 if (cb->aio_lio_opcode == LIO_READ) {
584 auio.uio_rw = UIO_READ;
585 error = fo_read(fp, &auio, fp->f_cred, O_FOFFSET);
586 } else {
587 auio.uio_rw = UIO_WRITE;
588 error = fo_write(fp, &auio, fp->f_cred, O_FOFFSET);
589 }
590 inblock_end = mytd->td_lwp->lwp_ru.ru_inblock;
591 oublock_end = mytd->td_lwp->lwp_ru.ru_oublock;
592
593 aiocbe->inputcharge = inblock_end - inblock_st;
594 aiocbe->outputcharge = oublock_end - oublock_st;
595
596 if ((error) && (auio.uio_resid != cnt)) {
597 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
598 error = 0;
599 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE))
600 ksignal(aiocbe->userproc, SIGPIPE);
601 }
602
603 cnt -= auio.uio_resid;
604 cb->_aiocb_private.error = error;
605 cb->_aiocb_private.status = cnt;
606 }
607
608 /*
609 * The AIO daemon, most of the actual work is done in aio_process,
610 * but the setup (and address space mgmt) is done in this routine.
611 *
612 * The MP lock is held on entry.
613 */
614 static void
615 aio_daemon(void *uproc, struct trapframe *frame)
616 {
617 struct aio_liojob *lj;
618 struct aiocb *cb;
619 struct aiocblist *aiocbe;
620 struct aioproclist *aiop;
621 struct kaioinfo *ki;
622 struct proc *mycp, *userp;
623 struct vmspace *curvm;
624 struct lwp *mylwp;
625 struct ucred *cr;
626
627 mylwp = curthread->td_lwp;
628 mycp = mylwp->lwp_proc;
629
630 if (mycp->p_textvp) {
631 vrele(mycp->p_textvp);
632 mycp->p_textvp = NULL;
633 }
634
635 /*
636 * Allocate and ready the aio control info. There is one aiop structure
637 * per daemon.
638 */
639 aiop = zalloc(aiop_zone);
640 aiop->aioproc = mycp;
641 aiop->aioprocflags |= AIOP_FREE;
642
643 crit_enter();
644
645 /*
646 * Place thread (lightweight process) onto the AIO free thread list.
647 */
648 if (TAILQ_EMPTY(&aio_freeproc))
649 wakeup(&aio_freeproc);
650 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
651
652 crit_exit();
653
654 /* Make up a name for the daemon. */
655 strcpy(mycp->p_comm, "aiod");
656
657 /*
658 * Get rid of our current filedescriptors. AIOD's don't need any
659 * filedescriptors, except as temporarily inherited from the client.
660 * Credentials are also cloned, and made equivalent to "root".
661 */
662 fdfree(mycp, NULL);
663 cr = cratom(&mycp->p_ucred);
664 cr->cr_uid = 0;
665 uireplace(&cr->cr_uidinfo, uifind(0));
666 cr->cr_ngroups = 1;
667 cr->cr_groups[0] = 1;
668
669 /* The daemon resides in its own pgrp. */
670 enterpgrp(mycp, mycp->p_pid, 1);
671
672 /* Mark special process type. */
673 mycp->p_flag |= P_SYSTEM | P_KTHREADP;
674
675 /*
676 * Wakeup parent process. (Parent sleeps to keep from blasting away
677 * and creating too many daemons.)
678 */
679 wakeup(mycp);
680 curvm = NULL;
681
682 for (;;) {
683 /*
684 * Take daemon off of free queue
685 */
686 if (aiop->aioprocflags & AIOP_FREE) {
687 crit_enter();
688 TAILQ_REMOVE(&aio_freeproc, aiop, list);
689 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
690 aiop->aioprocflags &= ~AIOP_FREE;
691 crit_exit();
692 }
693 aiop->aioprocflags &= ~AIOP_SCHED;
694
695 /*
696 * Check for jobs.
697 */
698 while ((aiocbe = aio_selectjob(aiop)) != NULL) {
699 cb = &aiocbe->uaiocb;
700 userp = aiocbe->userproc;
701
702 aiocbe->jobstate = JOBST_JOBRUNNING;
703
704 /*
705 * Connect to process address space for user program.
706 */
707 if (curvm != userp->p_vmspace) {
708 pmap_setlwpvm(mylwp, userp->p_vmspace);
709 if (curvm)
710 sysref_put(&curvm->vm_sysref);
711 curvm = userp->p_vmspace;
712 sysref_get(&curvm->vm_sysref);
713 }
714
715 ki = userp->p_aioinfo;
716 lj = aiocbe->lio;
717
718 /* Account for currently active jobs. */
719 ki->kaio_active_count++;
720
721 /* Do the I/O function. */
722 aio_process(aiocbe);
723
724 /* Decrement the active job count. */
725 ki->kaio_active_count--;
726
727 /*
728 * Increment the completion count for wakeup/signal
729 * comparisons.
730 */
731 aiocbe->jobflags |= AIOCBLIST_DONE;
732 ki->kaio_queue_finished_count++;
733 if (lj)
734 lj->lioj_queue_finished_count++;
735 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags
736 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) {
737 ki->kaio_flags &= ~KAIO_WAKEUP;
738 wakeup(userp);
739 }
740
741 crit_enter();
742 if (lj && (lj->lioj_flags &
743 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) {
744 if ((lj->lioj_queue_finished_count ==
745 lj->lioj_queue_count) &&
746 (lj->lioj_buffer_finished_count ==
747 lj->lioj_buffer_count)) {
748 ksignal(userp,
749 lj->lioj_signal.sigev_signo);
750 lj->lioj_flags |=
751 LIOJ_SIGNAL_POSTED;
752 }
753 }
754 crit_exit();
755
756 aiocbe->jobstate = JOBST_JOBFINISHED;
757
758 crit_enter();
759 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
760 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist);
761 crit_exit();
762 KNOTE(&aiocbe->klist, 0);
763
764 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) {
765 wakeup(aiocbe);
766 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
767 }
768
769 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
770 ksignal(userp, cb->aio_sigevent.sigev_signo);
771 }
772 }
773
774 /*
775 * Disconnect from user address space.
776 */
777 if (curvm) {
778 /* swap our original address space back in */
779 pmap_setlwpvm(mylwp, mycp->p_vmspace);
780 sysref_put(&curvm->vm_sysref);
781 curvm = NULL;
782 }
783
784 /*
785 * If we are the first to be put onto the free queue, wakeup
786 * anyone waiting for a daemon.
787 */
788 crit_enter();
789 TAILQ_REMOVE(&aio_activeproc, aiop, list);
790 if (TAILQ_EMPTY(&aio_freeproc))
791 wakeup(&aio_freeproc);
792 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
793 aiop->aioprocflags |= AIOP_FREE;
794 crit_exit();
795
796 /*
797 * If daemon is inactive for a long time, allow it to exit,
798 * thereby freeing resources.
799 */
800 if (((aiop->aioprocflags & AIOP_SCHED) == 0) && tsleep(mycp,
801 0, "aiordy", aiod_lifetime)) {
802 crit_enter();
803 if (TAILQ_EMPTY(&aio_jobs)) {
804 if ((aiop->aioprocflags & AIOP_FREE) &&
805 (num_aio_procs > target_aio_procs)) {
806 TAILQ_REMOVE(&aio_freeproc, aiop, list);
807 crit_exit();
808 zfree(aiop_zone, aiop);
809 num_aio_procs--;
810 #ifdef DIAGNOSTIC
811 if (mycp->p_vmspace->vm_sysref.refcnt <= 1) {
812 kprintf("AIOD: bad vm refcnt for"
813 " exiting daemon: %d\n",
814 mycp->p_vmspace->vm_sysref.refcnt);
815 }
816 #endif
817 exit1(0);
818 }
819 }
820 crit_exit();
821 }
822 }
823 }
824
825 /*
826 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
827 * AIO daemon modifies its environment itself.
828 */
829 static int
830 aio_newproc(void)
831 {
832 int error;
833 struct lwp *lp, *nlp;
834 struct proc *np;
835
836 lp = &lwp0;
837 error = fork1(lp, RFPROC|RFMEM|RFNOWAIT, &np);
838 if (error)
839 return error;
840 nlp = ONLY_LWP_IN_PROC(np);
841 cpu_set_fork_handler(nlp, aio_daemon, curproc);
842 start_forked_proc(lp, np);
843
844 /*
845 * Wait until daemon is started, but continue on just in case to
846 * handle error conditions.
847 */
848 error = tsleep(np, 0, "aiosta", aiod_timeout);
849 num_aio_procs++;
850
851 return error;
852 }
853
854 /*
855 * Try the high-performance, low-overhead physio method for eligible
856 * VCHR devices. This method doesn't use an aio helper thread, and
857 * thus has very low overhead.
858 *
859 * Assumes that the caller, _aio_aqueue(), has incremented the file
860 * structure's reference count, preventing its deallocation for the
861 * duration of this call.
862 */
863 static int
864 aio_qphysio(struct proc *p, struct aiocblist *aiocbe)
865 {
866 int error;
867 struct aiocb *cb;
868 struct file *fp;
869 struct buf *bp;
870 struct vnode *vp;
871 struct kaioinfo *ki;
872 struct aio_liojob *lj;
873 int notify;
874
875 cb = &aiocbe->uaiocb;
876 fp = aiocbe->fd_file;
877
878 if (fp->f_type != DTYPE_VNODE)
879 return (-1);
880
881 vp = (struct vnode *)fp->f_data;
882
883 /*
884 * If its not a disk, we don't want to return a positive error.
885 * It causes the aio code to not fall through to try the thread
886 * way when you're talking to a regular file.
887 */
888 if (!vn_isdisk(vp, &error)) {
889 if (error == ENOTBLK)
890 return (-1);
891 else
892 return (error);
893 }
894
895 if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys)
896 return (-1);
897
898 if (cb->aio_nbytes >
899 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK))
900 return (-1);
901
902 ki = p->p_aioinfo;
903 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count)
904 return (-1);
905
906 ki->kaio_buffer_count++;
907
908 lj = aiocbe->lio;
909 if (lj)
910 lj->lioj_buffer_count++;
911
912 /* Create and build a buffer header for a transfer. */
913 bp = getpbuf(NULL);
914 BUF_KERNPROC(bp);
915
916 /*
917 * Get a copy of the kva from the physical buffer.
918 */
919 bp->b_bio1.bio_caller_info1.ptr = p;
920 error = 0;
921
922 bp->b_cmd = (cb->aio_lio_opcode == LIO_WRITE) ?
923 BUF_CMD_WRITE : BUF_CMD_READ;
924 bp->b_bio1.bio_done = aio_physwakeup;
925 bp->b_bio1.bio_flags |= BIO_SYNC;
926 bp->b_bio1.bio_offset = cb->aio_offset;
927
928 /* Bring buffer into kernel space. */
929 if (vmapbuf(bp, __DEVOLATILE(char *, cb->aio_buf), cb->aio_nbytes) < 0) {
930 error = EFAULT;
931 goto doerror;
932 }
933
934 crit_enter();
935
936 aiocbe->bp = bp;
937 bp->b_bio1.bio_caller_info2.ptr = aiocbe;
938 TAILQ_INSERT_TAIL(&aio_bufjobs, aiocbe, list);
939 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist);
940 aiocbe->jobstate = JOBST_JOBQBUF;
941 cb->_aiocb_private.status = cb->aio_nbytes;
942 num_buf_aio++;
943 bp->b_error = 0;
944
945 crit_exit();
946
947 /*
948 * Perform the transfer. vn_strategy must be used even though we
949 * know we have a device in order to deal with requests which exceed
950 * device DMA limitations.
951 */
952 vn_strategy(vp, &bp->b_bio1);
953
954 notify = 0;
955 crit_enter();
956
957 #if 0
958 /*
959 * If we had an error invoking the request, or an error in processing
960 * the request before we have returned, we process it as an error in
961 * transfer. Note that such an I/O error is not indicated immediately,
962 * but is returned using the aio_error mechanism. In this case,
963 * aio_suspend will return immediately.
964 */
965 if (bp->b_error || (bp->b_flags & B_ERROR)) {
966 struct aiocb *job = aiocbe->uuaiocb;
967
968 aiocbe->uaiocb._aiocb_private.status = 0;
969 suword(&job->_aiocb_private.status, 0);
970 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
971 suword(&job->_aiocb_private.error, bp->b_error);
972
973 ki->kaio_buffer_finished_count++;
974
975 if (aiocbe->jobstate != JOBST_JOBBFINISHED) {
976 aiocbe->jobstate = JOBST_JOBBFINISHED;
977 aiocbe->jobflags |= AIOCBLIST_DONE;
978 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list);
979 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist);
980 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist);
981 notify = 1;
982 }
983 }
984 #endif
985 crit_exit();
986 if (notify)
987 KNOTE(&aiocbe->klist, 0);
988 return 0;
989
990 doerror:
991 ki->kaio_buffer_count--;
992 if (lj)
993 lj->lioj_buffer_count--;
994 aiocbe->bp = NULL;
995 relpbuf(bp, NULL);
996 return error;
997 }
998
999 /*
1000 * This waits/tests physio completion.
1001 */
1002 static int
1003 aio_fphysio(struct aiocblist *iocb)
1004 {
1005 struct buf *bp;
1006 int error;
1007
1008 bp = iocb->bp;
1009
1010 error = biowait_timeout(&bp->b_bio1, "physstr", aiod_timeout);
1011 if (error == EWOULDBLOCK)
1012 return EINPROGRESS;
1013
1014 /* Release mapping into kernel space. */
1015 vunmapbuf(bp);
1016 iocb->bp = 0;
1017
1018 error = 0;
1019
1020 /* Check for an error. */
1021 if (bp->b_flags & B_ERROR)
1022 error = bp->b_error;
1023
1024 relpbuf(bp, NULL);
1025 return (error);
1026 }
1027 #endif /* VFS_AIO */
1028
1029 /*
1030 * Wake up aio requests that may be serviceable now.
1031 */
1032 void
1033 aio_swake(struct socket *so, struct signalsockbuf *ssb)
1034 {
1035 #ifndef VFS_AIO
1036 return;
1037 #else
1038 struct aiocblist *cb,*cbn;
1039 struct proc *p;
1040 struct kaioinfo *ki = NULL;
1041 int opcode, wakecount = 0;
1042 struct aioproclist *aiop;
1043
1044 if (ssb == &so->so_snd) {
1045 opcode = LIO_WRITE;
1046 so->so_snd.ssb_flags &= ~SSB_AIO;
1047 } else {
1048 opcode = LIO_READ;
1049 so->so_rcv.ssb_flags &= ~SSB_AIO;
1050 }
1051
1052 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) {
1053 cbn = TAILQ_NEXT(cb, list);
1054 if (opcode == cb->uaiocb.aio_lio_opcode) {
1055 p = cb->userproc;
1056 ki = p->p_aioinfo;
1057 TAILQ_REMOVE(&so->so_aiojobq, cb, list);
1058 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist);
1059 TAILQ_INSERT_TAIL(&aio_jobs, cb, list);
1060 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist);
1061 wakecount++;
1062 if (cb->jobstate != JOBST_JOBQGLOBAL)
1063 panic("invalid queue value");
1064 }
1065 }
1066
1067 while (wakecount--) {
1068 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) {
1069 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1070 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
1071 aiop->aioprocflags &= ~AIOP_FREE;
1072 wakeup(aiop->aioproc);
1073 }
1074 }
1075 #endif /* VFS_AIO */
1076 }
1077
1078 #ifdef VFS_AIO
1079 /*
1080 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR
1081 * technique is done in this code.
1082 */
1083 static int
1084 _aio_aqueue(struct aiocb *job, struct aio_liojob *lj, int type)
1085 {
1086 struct proc *p = curproc;
1087 struct filedesc *fdp;
1088 struct file *fp;
1089 unsigned int fd;
1090 struct socket *so;
1091 int error;
1092 int opcode, user_opcode;
1093 struct aiocblist *aiocbe;
1094 struct aioproclist *aiop;
1095 struct kaioinfo *ki;
1096 struct kevent kev;
1097 struct kqueue *kq;
1098 struct file *kq_fp;
1099
1100 if ((aiocbe = TAILQ_FIRST(&aio_freejobs)) != NULL)
1101 TAILQ_REMOVE(&aio_freejobs, aiocbe, list);
1102 else
1103 aiocbe = zalloc (aiocb_zone);
1104
1105 aiocbe->inputcharge = 0;
1106 aiocbe->outputcharge = 0;
1107 callout_init(&aiocbe->timeout);
1108 SLIST_INIT(&aiocbe->klist);
1109
1110 suword(&job->_aiocb_private.status, -1);
1111 suword(&job->_aiocb_private.error, 0);
1112 suword(&job->_aiocb_private.kernelinfo, -1);
1113
1114 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb));
1115 if (error) {
1116 suword(&job->_aiocb_private.error, error);
1117 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1118 return error;
1119 }
1120 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL &&
1121 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) {
1122 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1123 return EINVAL;
1124 }
1125
1126 /* Save userspace address of the job info. */
1127 aiocbe->uuaiocb = job;
1128
1129 /* Get the opcode. */
1130 user_opcode = aiocbe->uaiocb.aio_lio_opcode;
1131 if (type != LIO_NOP)
1132 aiocbe->uaiocb.aio_lio_opcode = type;
1133 opcode = aiocbe->uaiocb.aio_lio_opcode;
1134
1135 /* Get the fd info for process. */
1136 fdp = p->p_fd;
1137
1138 /*
1139 * Range check file descriptor.
1140 */
1141 fd = aiocbe->uaiocb.aio_fildes;
1142 if (fd >= fdp->fd_nfiles) {
1143 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1144 if (type == 0)
1145 suword(&job->_aiocb_private.error, EBADF);
1146 return EBADF;
1147 }
1148
1149 fp = aiocbe->fd_file = fdp->fd_files[fd].fp;
1150 if ((fp == NULL) || ((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) ==
1151 0))) {
1152 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1153 if (type == 0)
1154 suword(&job->_aiocb_private.error, EBADF);
1155 return EBADF;
1156 }
1157 fhold(fp);
1158
1159 if (aiocbe->uaiocb.aio_offset == -1LL) {
1160 error = EINVAL;
1161 goto aqueue_fail;
1162 }
1163 error = suword(&job->_aiocb_private.kernelinfo, jobrefid);
1164 if (error) {
1165 error = EINVAL;
1166 goto aqueue_fail;
1167 }
1168 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid;
1169 if (jobrefid == LONG_MAX)
1170 jobrefid = 1;
1171 else
1172 jobrefid++;
1173
1174 if (opcode == LIO_NOP) {
1175 fdrop(fp);
1176 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1177 if (type == 0) {
1178 suword(&job->_aiocb_private.error, 0);
1179 suword(&job->_aiocb_private.status, 0);
1180 suword(&job->_aiocb_private.kernelinfo, 0);
1181 }
1182 return 0;
1183 }
1184 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) {
1185 if (type == 0)
1186 suword(&job->_aiocb_private.status, 0);
1187 error = EINVAL;
1188 goto aqueue_fail;
1189 }
1190
1191 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) {
1192 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue;
1193 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sigval_ptr;
1194 }
1195 else {
1196 /*
1197 * This method for requesting kevent-based notification won't
1198 * work on the alpha, since we're passing in a pointer
1199 * via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT-
1200 * based method instead.
1201 */
1202 if (user_opcode == LIO_NOP || user_opcode == LIO_READ ||
1203 user_opcode == LIO_WRITE)
1204 goto no_kqueue;
1205
1206 error = copyin((struct kevent *)(uintptr_t)user_opcode,
1207 &kev, sizeof(kev));
1208 if (error)
1209 goto aqueue_fail;
1210 }
1211 if ((u_int)kev.ident >= fdp->fd_nfiles ||
1212 (kq_fp = fdp->fd_files[kev.ident].fp) == NULL ||
1213 (kq_fp->f_type != DTYPE_KQUEUE)) {
1214 error = EBADF;
1215 goto aqueue_fail;
1216 }
1217 kq = (struct kqueue *)kq_fp->f_data;
1218 kev.ident = (uintptr_t)aiocbe->uuaiocb;
1219 kev.filter = EVFILT_AIO;
1220 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
1221 kev.data = (intptr_t)aiocbe;
1222 /* XXX lwp kqueue_register takes a thread, but only uses its proc */
1223 error = kqueue_register(kq, &kev, FIRST_LWP_IN_PROC(p)->lwp_thread);
1224 aqueue_fail:
1225 if (error) {
1226 fdrop(fp);
1227 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1228 if (type == 0)
1229 suword(&job->_aiocb_private.error, error);
1230 goto done;
1231 }
1232 no_kqueue:
1233
1234 suword(&job->_aiocb_private.error, EINPROGRESS);
1235 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS;
1236 aiocbe->userproc = p;
1237 aiocbe->jobflags = 0;
1238 aiocbe->lio = lj;
1239 ki = p->p_aioinfo;
1240
1241 if (fp->f_type == DTYPE_SOCKET) {
1242 /*
1243 * Alternate queueing for socket ops: Reach down into the
1244 * descriptor to get the socket data. Then check to see if the
1245 * socket is ready to be read or written (based on the requested
1246 * operation).
1247 *
1248 * If it is not ready for io, then queue the aiocbe on the
1249 * socket, and set the flags so we get a call when ssb_notify()
1250 * happens.
1251 */
1252 so = (struct socket *)fp->f_data;
1253 crit_enter();
1254 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode ==
1255 LIO_WRITE) && (!sowriteable(so)))) {
1256 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list);
1257 TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist);
1258 if (opcode == LIO_READ)
1259 so->so_rcv.ssb_flags |= SSB_AIO;
1260 else
1261 so->so_snd.ssb_flags |= SSB_AIO;
1262 aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */
1263 ki->kaio_queue_count++;
1264 num_queue_count++;
1265 crit_exit();
1266 error = 0;
1267 goto done;
1268 }
1269 crit_exit();
1270 }
1271
1272 if ((error = aio_qphysio(p, aiocbe)) == 0)
1273 goto done;
1274 if (error > 0) {
1275 suword(&job->_aiocb_private.status, 0);
1276 aiocbe->uaiocb._aiocb_private.error = error;
1277 suword(&job->_aiocb_private.error, error);
1278 goto done;
1279 }
1280
1281 /* No buffer for daemon I/O. */
1282 aiocbe->bp = NULL;
1283
1284 ki->kaio_queue_count++;
1285 if (lj)
1286 lj->lioj_queue_count++;
1287 crit_enter();
1288 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
1289 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
1290 crit_exit();
1291 aiocbe->jobstate = JOBST_JOBQGLOBAL;
1292
1293 num_queue_count++;
1294 error = 0;
1295
1296 /*
1297 * If we don't have a free AIO process, and we are below our quota, then
1298 * start one. Otherwise, depend on the subsequent I/O completions to
1299 * pick-up this job. If we don't successfully create the new process
1300 * (thread) due to resource issues, we return an error for now (EAGAIN),
1301 * which is likely not the correct thing to do.
1302 */
1303 crit_enter();
1304 retryproc:
1305 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1306 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1307 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
1308 aiop->aioprocflags &= ~AIOP_FREE;
1309 wakeup(aiop->aioproc);
1310 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
1311 ((ki->kaio_active_count + num_aio_resv_start) <
1312 ki->kaio_maxactive_count)) {
1313 num_aio_resv_start++;
1314 if ((error = aio_newproc()) == 0) {
1315 num_aio_resv_start--;
1316 goto retryproc;
1317 }
1318 num_aio_resv_start--;
1319 }
1320 crit_exit();
1321 done:
1322 return error;
1323 }
1324
1325 /*
1326 * This routine queues an AIO request, checking for quotas.
1327 */
1328 static int
1329 aio_aqueue(struct aiocb *job, int type)
1330 {
1331 struct proc *p = curproc;
1332 struct kaioinfo *ki;
1333
1334 if (p->p_aioinfo == NULL)
1335 aio_init_aioinfo(p);
1336
1337 if (num_queue_count >= max_queue_count)
1338 return EAGAIN;
1339
1340 ki = p->p_aioinfo;
1341 if (ki->kaio_queue_count >= ki->kaio_qallowed_count)
1342 return EAGAIN;
1343
1344 return _aio_aqueue(job, NULL, type);
1345 }
1346 #endif /* VFS_AIO */
1347
1348 /*
1349 * Support the aio_return system call, as a side-effect, kernel resources are
1350 * released.
1351 */
1352 int
1353 sys_aio_return(struct aio_return_args *uap)
1354 {
1355 #ifndef VFS_AIO
1356 return ENOSYS;
1357 #else
1358 struct proc *p = curproc;
1359 struct lwp *lp = curthread->td_lwp;
1360 long jobref;
1361 struct aiocblist *cb, *ncb;
1362 struct aiocb *ujob;
1363 struct kaioinfo *ki;
1364
1365 ki = p->p_aioinfo;
1366 if (ki == NULL)
1367 return EINVAL;
1368
1369 ujob = uap->aiocbp;
1370
1371 jobref = fuword(&ujob->_aiocb_private.kernelinfo);
1372 if (jobref == -1 || jobref == 0)
1373 return EINVAL;
1374
1375 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1376 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) ==
1377 jobref) {
1378 if (ujob == cb->uuaiocb) {
1379 uap->sysmsg_result =
1380 cb->uaiocb._aiocb_private.status;
1381 } else
1382 uap->sysmsg_result = EFAULT;
1383 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
1384 lp->lwp_ru.ru_oublock += cb->outputcharge;
1385 cb->outputcharge = 0;
1386 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
1387 lp->lwp_ru.ru_inblock += cb->inputcharge;
1388 cb->inputcharge = 0;
1389 }
1390 aio_free_entry(cb);
1391 return 0;
1392 }
1393 }
1394 crit_enter();
1395 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) {
1396 ncb = TAILQ_NEXT(cb, plist);
1397 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo)
1398 == jobref) {
1399 crit_exit();
1400 if (ujob == cb->uuaiocb) {
1401 uap->sysmsg_result =
1402 cb->uaiocb._aiocb_private.status;
1403 } else
1404 uap->sysmsg_result = EFAULT;
1405 aio_free_entry(cb);
1406 return 0;
1407 }
1408 }
1409 crit_exit();
1410
1411 return (EINVAL);
1412 #endif /* VFS_AIO */
1413 }
1414
1415 /*
1416 * Allow a process to wakeup when any of the I/O requests are completed.
1417 */
1418 int
1419 sys_aio_suspend(struct aio_suspend_args *uap)
1420 {
1421 #ifndef VFS_AIO
1422 return ENOSYS;
1423 #else
1424 struct proc *p = curproc;
1425 struct timeval atv;
1426 struct timespec ts;
1427 struct aiocb *const *cbptr, *cbp;
1428 struct kaioinfo *ki;
1429 struct aiocblist *cb;
1430 int i;
1431 int njoblist;
1432 int error, timo;
1433 long *ijoblist;
1434 struct aiocb **ujoblist;
1435
1436 if (uap->nent > AIO_LISTIO_MAX)
1437 return EINVAL;
1438
1439 timo = 0;
1440 if (uap->timeout) {
1441 /* Get timespec struct. */
1442 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
1443 return error;
1444
1445 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
1446 return (EINVAL);
1447
1448 TIMESPEC_TO_TIMEVAL(&atv, &ts);
1449 if (itimerfix(&atv))
1450 return (EINVAL);
1451 timo = tvtohz_high(&atv);
1452 }
1453
1454 ki = p->p_aioinfo;
1455 if (ki == NULL)
1456 return EAGAIN;
1457
1458 njoblist = 0;
1459 ijoblist = zalloc(aiol_zone);
1460 ujoblist = zalloc(aiol_zone);
1461 cbptr = uap->aiocbp;
1462
1463 for (i = 0; i < uap->nent; i++) {
1464 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
1465 if (cbp == 0)
1466 continue;
1467 ujoblist[njoblist] = cbp;
1468 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo);
1469 njoblist++;
1470 }
1471
1472 if (njoblist == 0) {
1473 zfree(aiol_zone, ijoblist);
1474 zfree(aiol_zone, ujoblist);
1475 return 0;
1476 }
1477
1478 error = 0;
1479 for (;;) {
1480 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1481 for (i = 0; i < njoblist; i++) {
1482 if (((intptr_t)
1483 cb->uaiocb._aiocb_private.kernelinfo) ==
1484 ijoblist[i]) {
1485 if (ujoblist[i] != cb->uuaiocb)
1486 error = EINVAL;
1487 zfree(aiol_zone, ijoblist);
1488 zfree(aiol_zone, ujoblist);
1489 return error;
1490 }
1491 }
1492 }
1493
1494 crit_enter();
1495 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb =
1496 TAILQ_NEXT(cb, plist)) {
1497 for (i = 0; i < njoblist; i++) {
1498 if (((intptr_t)
1499 cb->uaiocb._aiocb_private.kernelinfo) ==
1500 ijoblist[i]) {
1501 crit_exit();
1502 if (ujoblist[i] != cb->uuaiocb)
1503 error = EINVAL;
1504 zfree(aiol_zone, ijoblist);
1505 zfree(aiol_zone, ujoblist);
1506 return error;
1507 }
1508 }
1509 }
1510
1511 ki->kaio_flags |= KAIO_WAKEUP;
1512 error = tsleep(p, PCATCH, "aiospn", timo);
1513 crit_exit();
1514
1515 if (error == ERESTART || error == EINTR) {
1516 zfree(aiol_zone, ijoblist);
1517 zfree(aiol_zone, ujoblist);
1518 return EINTR;
1519 } else if (error == EWOULDBLOCK) {
1520 zfree(aiol_zone, ijoblist);
1521 zfree(aiol_zone, ujoblist);
1522 return EAGAIN;
1523 }
1524 }
1525
1526 /* NOTREACHED */
1527 return EINVAL;
1528 #endif /* VFS_AIO */
1529 }
1530
1531 /*
1532 * aio_cancel cancels any non-physio aio operations not currently in
1533 * progress.
1534 */
1535 int
1536 sys_aio_cancel(struct aio_cancel_args *uap)
1537 {
1538 #ifndef VFS_AIO
1539 return ENOSYS;
1540 #else
1541 struct proc *p = curproc;
1542 struct kaioinfo *ki;
1543 struct aiocblist *cbe, *cbn;
1544 struct file *fp;
1545 struct filedesc *fdp;
1546 struct socket *so;
1547 struct proc *po;
1548 int error;
1549 int cancelled=0;
1550 int notcancelled=0;
1551 struct vnode *vp;
1552
1553 fdp = p->p_fd;
1554 if ((u_int)uap->fd >= fdp->fd_nfiles ||
1555 (fp = fdp->fd_files[uap->fd].fp) == NULL)
1556 return (EBADF);
1557
1558 if (fp->f_type == DTYPE_VNODE) {
1559 vp = (struct vnode *)fp->f_data;
1560
1561 if (vn_isdisk(vp,&error)) {
1562 uap->sysmsg_result = AIO_NOTCANCELED;
1563 return 0;
1564 }
1565 } else if (fp->f_type == DTYPE_SOCKET) {
1566 so = (struct socket *)fp->f_data;
1567
1568 crit_enter();
1569
1570 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) {
1571 cbn = TAILQ_NEXT(cbe, list);
1572 if ((uap->aiocbp == NULL) ||
1573 (uap->aiocbp == cbe->uuaiocb) ) {
1574 po = cbe->userproc;
1575 ki = po->p_aioinfo;
1576 TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
1577 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist);
1578 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist);
1579 if (ki->kaio_flags & KAIO_WAKEUP) {
1580 wakeup(po);
1581 }
1582 cbe->jobstate = JOBST_JOBFINISHED;
1583 cbe->uaiocb._aiocb_private.status=-1;
1584 cbe->uaiocb._aiocb_private.error=ECANCELED;
1585 cancelled++;
1586 /* XXX cancelled, knote? */
1587 if (cbe->uaiocb.aio_sigevent.sigev_notify ==
1588 SIGEV_SIGNAL)
1589 ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
1590 if (uap->aiocbp)
1591 break;
1592 }
1593 }
1594 crit_exit();
1595
1596 if ((cancelled) && (uap->aiocbp)) {
1597 uap->sysmsg_result = AIO_CANCELED;
1598 return 0;
1599 }
1600 }
1601 ki=p->p_aioinfo;
1602 if (ki == NULL)
1603 goto done;
1604 crit_enter();
1605
1606 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) {
1607 cbn = TAILQ_NEXT(cbe, plist);
1608
1609 if ((uap->fd == cbe->uaiocb.aio_fildes) &&
1610 ((uap->aiocbp == NULL ) ||
1611 (uap->aiocbp == cbe->uuaiocb))) {
1612
1613 if (cbe->jobstate == JOBST_JOBQGLOBAL) {
1614 TAILQ_REMOVE(&aio_jobs, cbe, list);
1615 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
1616 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe,
1617 plist);
1618 cancelled++;
1619 ki->kaio_queue_finished_count++;
1620 cbe->jobstate = JOBST_JOBFINISHED;
1621 cbe->uaiocb._aiocb_private.status = -1;
1622 cbe->uaiocb._aiocb_private.error = ECANCELED;
1623 /* XXX cancelled, knote? */
1624 if (cbe->uaiocb.aio_sigevent.sigev_notify ==
1625 SIGEV_SIGNAL)
1626 ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
1627 } else {
1628 notcancelled++;
1629 }
1630 }
1631 }
1632 crit_exit();
1633 done:
1634 if (notcancelled) {
1635 uap->sysmsg_result = AIO_NOTCANCELED;
1636 return 0;
1637 }
1638 if (cancelled) {
1639 uap->sysmsg_result = AIO_CANCELED;
1640 return 0;
1641 }
1642 uap->sysmsg_result = AIO_ALLDONE;
1643
1644 return 0;
1645 #endif /* VFS_AIO */
1646 }
1647
1648 /*
1649 * aio_error is implemented in the kernel level for compatibility purposes only.
1650 * For a user mode async implementation, it would be best to do it in a userland
1651 * subroutine.
1652 */
1653 int
1654 sys_aio_error(struct aio_error_args *uap)
1655 {
1656 #ifndef VFS_AIO
1657 return ENOSYS;
1658 #else
1659 struct proc *p = curproc;
1660 struct aiocblist *cb;
1661 struct kaioinfo *ki;
1662 long jobref;
1663
1664 ki = p->p_aioinfo;
1665 if (ki == NULL)
1666 return EINVAL;
1667
1668 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo);
1669 if ((jobref == -1) || (jobref == 0))
1670 return EINVAL;
1671
1672 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1673 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1674 jobref) {
1675 uap->sysmsg_result = cb->uaiocb._aiocb_private.error;
1676 return 0;
1677 }
1678 }
1679
1680 crit_enter();
1681
1682 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb,
1683 plist)) {
1684 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1685 jobref) {
1686 uap->sysmsg_result = EINPROGRESS;
1687 crit_exit();
1688 return 0;
1689 }
1690 }
1691
1692 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb,
1693 plist)) {
1694 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1695 jobref) {
1696 uap->sysmsg_result = EINPROGRESS;
1697 crit_exit();
1698 return 0;
1699 }
1700 }
1701 crit_exit();
1702
1703 crit_enter();
1704 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb,
1705 plist)) {
1706 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1707 jobref) {
1708 uap->sysmsg_result = cb->uaiocb._aiocb_private.error;
1709 crit_exit();
1710 return 0;
1711 }
1712 }
1713
1714 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb,
1715 plist)) {
1716 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1717 jobref) {
1718 uap->sysmsg_result = EINPROGRESS;
1719 crit_exit();
1720 return 0;
1721 }
1722 }
1723 crit_exit();
1724
1725 #if (0)
1726 /*
1727 * Hack for lio.
1728 */
1729 status = fuword(&uap->aiocbp->_aiocb_private.status);
1730 if (status == -1)
1731 return fuword(&uap->aiocbp->_aiocb_private.error);
1732 #endif
1733 return EINVAL;
1734 #endif /* VFS_AIO */
1735 }
1736
1737 /* syscall - asynchronous read from a file (REALTIME) */
1738 int
1739 sys_aio_read(struct aio_read_args *uap)
1740 {
1741 #ifndef VFS_AIO
1742 return ENOSYS;
1743 #else
1744 return aio_aqueue(uap->aiocbp, LIO_READ);
1745 #endif /* VFS_AIO */
1746 }
1747
1748 /* syscall - asynchronous write to a file (REALTIME) */
1749 int
1750 sys_aio_write(struct aio_write_args *uap)
1751 {
1752 #ifndef VFS_AIO
1753 return ENOSYS;
1754 #else
1755 return aio_aqueue(uap->aiocbp, LIO_WRITE);
1756 #endif /* VFS_AIO */
1757 }
1758
1759 /* syscall - XXX undocumented */
1760 int
1761 sys_lio_listio(struct lio_listio_args *uap)
1762 {
1763 #ifndef VFS_AIO
1764 return ENOSYS;
1765 #else
1766 struct proc *p = curproc;
1767 struct lwp *lp = curthread->td_lwp;
1768 int nent, nentqueued;
1769 struct aiocb *iocb, * const *cbptr;
1770 struct aiocblist *cb;
1771 struct kaioinfo *ki;
1772 struct aio_liojob *lj;
1773 int error, runningcode;
1774 int nerror;
1775 int i;
1776
1777 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
1778 return EINVAL;
1779
1780 nent = uap->nent;
1781 if (nent > AIO_LISTIO_MAX)
1782 return EINVAL;
1783
1784 if (p->p_aioinfo == NULL)
1785 aio_init_aioinfo(p);
1786
1787 if ((nent + num_queue_count) > max_queue_count)
1788 return EAGAIN;
1789
1790 ki = p->p_aioinfo;
1791 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count)
1792 return EAGAIN;
1793
1794 lj = zalloc(aiolio_zone);
1795 if (!lj)
1796 return EAGAIN;
1797
1798 lj->lioj_flags = 0;
1799 lj->lioj_buffer_count = 0;
1800 lj->lioj_buffer_finished_count = 0;
1801 lj->lioj_queue_count = 0;
1802 lj->lioj_queue_finished_count = 0;
1803 lj->lioj_ki = ki;
1804
1805 /*
1806 * Setup signal.
1807 */
1808 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
1809 error = copyin(uap->sig, &lj->lioj_signal,
1810 sizeof(lj->lioj_signal));
1811 if (error) {
1812 zfree(aiolio_zone, lj);
1813 return error;
1814 }
1815 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
1816 zfree(aiolio_zone, lj);
1817 return EINVAL;
1818 }
1819 lj->lioj_flags |= LIOJ_SIGNAL;
1820 lj->lioj_flags &= ~LIOJ_SIGNAL_POSTED;
1821 } else
1822 lj->lioj_flags &= ~LIOJ_SIGNAL;
1823
1824 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
1825 /*
1826 * Get pointers to the list of I/O requests.
1827 */
1828 nerror = 0;
1829 nentqueued = 0;
1830 cbptr = uap->acb_list;
1831 for (i = 0; i < uap->nent; i++) {
1832 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
1833 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) {
1834 error = _aio_aqueue(iocb, lj, 0);
1835 if (error == 0)
1836 nentqueued++;
1837 else
1838 nerror++;
1839 }
1840 }
1841
1842 /*
1843 * If we haven't queued any, then just return error.
1844 */
1845 if (nentqueued == 0)
1846 return 0;
1847
1848 /*
1849 * Calculate the appropriate error return.
1850 */
1851 runningcode = 0;
1852 if (nerror)
1853 runningcode = EIO;
1854
1855 if (uap->mode == LIO_WAIT) {
1856 int command, found, jobref;
1857
1858 for (;;) {
1859 found = 0;
1860 for (i = 0; i < uap->nent; i++) {
1861 /*
1862 * Fetch address of the control buf pointer in
1863 * user space.
1864 */
1865 iocb = (struct aiocb *)
1866 (intptr_t)fuword(&cbptr[i]);
1867 if (((intptr_t)iocb == -1) || ((intptr_t)iocb
1868 == 0))
1869 continue;
1870
1871 /*
1872 * Fetch the associated command from user space.
1873 */
1874 command = fuword(&iocb->aio_lio_opcode);
1875 if (command == LIO_NOP) {
1876 found++;
1877 continue;
1878 }
1879
1880 jobref = fuword(&iocb->_aiocb_private.kernelinfo);
1881
1882 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1883 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo)
1884 == jobref) {
1885 if (cb->uaiocb.aio_lio_opcode
1886 == LIO_WRITE) {
1887 lp->lwp_ru.ru_oublock +=
1888 cb->outputcharge;
1889 cb->outputcharge = 0;
1890 } else if (cb->uaiocb.aio_lio_opcode
1891 == LIO_READ) {
1892 lp->lwp_ru.ru_inblock +=
1893 cb->inputcharge;
1894 cb->inputcharge = 0;
1895 }
1896 found++;
1897 break;
1898 }
1899 }
1900
1901 crit_enter();
1902 TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) {
1903 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo)
1904 == jobref) {
1905 found++;
1906 break;
1907 }
1908 }
1909 crit_exit();
1910 }
1911
1912 /*
1913 * If all I/Os have been disposed of, then we can
1914 * return.
1915 */
1916 if (found == nentqueued)
1917 return runningcode;
1918
1919 ki->kaio_flags |= KAIO_WAKEUP;
1920 error = tsleep(p, PCATCH, "aiospn", 0);
1921
1922 if (error == EINTR)
1923 return EINTR;
1924 else if (error == EWOULDBLOCK)
1925 return EAGAIN;
1926 }
1927 }
1928
1929 return runningcode;
1930 #endif /* VFS_AIO */
1931 }
1932
1933 #ifdef VFS_AIO
1934 /*
1935 * This is a weird hack so that we can post a signal. It is safe to do so from
1936 * a timeout routine, but *not* from an interrupt routine.
1937 */
1938 static void
1939 process_signal(void *aioj)
1940 {
1941 struct aiocblist *aiocbe = aioj;
1942 struct aio_liojob *lj = aiocbe->lio;
1943 struct aiocb *cb = &aiocbe->uaiocb;
1944
1945 if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) &&
1946 (lj->lioj_queue_count == lj->lioj_queue_finished_count)) {
1947 ksignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo);
1948 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
1949 }
1950
1951 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL)
1952 ksignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo);
1953 }
1954
1955 /*
1956 * Interrupt handler for physio, performs the necessary process wakeups, and
1957 * signals.
1958 */
1959 static void
1960 aio_physwakeup(struct bio *bio)
1961 {
1962 struct buf *bp = bio->bio_buf;
1963 struct aiocblist *aiocbe;
1964 struct proc *p;
1965 struct kaioinfo *ki;
1966 struct aio_liojob *lj;
1967
1968 aiocbe = bio->bio_caller_info2.ptr;
1969
1970 if (aiocbe) {
1971 p = bio->bio_caller_info1.ptr;
1972
1973 aiocbe->jobstate = JOBST_JOBBFINISHED;
1974 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid;
1975 aiocbe->uaiocb._aiocb_private.error = 0;
1976 aiocbe->jobflags |= AIOCBLIST_DONE;
1977
1978 if (bp->b_flags & B_ERROR)
1979 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
1980
1981 lj = aiocbe->lio;
1982 if (lj) {
1983 lj->lioj_buffer_finished_count++;
1984
1985 /*
1986 * wakeup/signal if all of the interrupt jobs are done.
1987 */
1988 if (lj->lioj_buffer_finished_count ==
1989 lj->lioj_buffer_count) {
1990 /*
1991 * Post a signal if it is called for.
1992 */
1993 if ((lj->lioj_flags &
1994 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) ==
1995 LIOJ_SIGNAL) {
1996 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
1997 callout_reset(&aiocbe->timeout, 0,
1998 process_signal, aiocbe);
1999 }
2000 }
2001 }
2002
2003 ki = p->p_aioinfo;
2004 if (ki) {
2005 ki->kaio_buffer_finished_count++;
2006 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list);
2007 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist);
2008 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist);
2009
2010 KNOTE(&aiocbe->klist, 0);
2011 /* Do the wakeup. */
2012 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) {
2013 ki->kaio_flags &= ~KAIO_WAKEUP;
2014 wakeup(p);
2015 }
2016 }
2017
2018 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
2019 callout_reset(&aiocbe->timeout, 0,
2020 process_signal, aiocbe);
2021 }
2022 }
2023 biodone_sync(bio);
2024 }
2025 #endif /* VFS_AIO */
2026
2027 /* syscall - wait for the next completion of an aio request */
2028 int
2029 sys_aio_waitcomplete(struct aio_waitcomplete_args *uap)
2030 {
2031 #ifndef VFS_AIO
2032 return ENOSYS;
2033 #else
2034 struct proc *p = curproc;
2035 struct lwp *lp = curthread->td_lwp;
2036 struct timeval atv;
2037 struct timespec ts;
2038 struct kaioinfo *ki;
2039 struct aiocblist *cb = NULL;
2040 int error, timo;
2041
2042 suword(uap->aiocbp, (int)NULL);
2043
2044 timo = 0;
2045 if (uap->timeout) {
2046 /* Get timespec struct. */
2047 error = copyin(uap->timeout, &ts, sizeof(ts));
2048 if (error)
2049 return error;
2050
2051 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000))
2052 return (EINVAL);
2053
2054 TIMESPEC_TO_TIMEVAL(&atv, &ts);
2055 if (itimerfix(&atv))
2056 return (EINVAL);
2057 timo = tvtohz_high(&atv);
2058 }
2059
2060 ki = p->p_aioinfo;
2061 if (ki == NULL)
2062 return EAGAIN;
2063
2064 for (;;) {
2065 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) {
2066 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
2067 uap->sysmsg_result = cb->uaiocb._aiocb_private.status;
2068 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
2069 lp->lwp_ru.ru_oublock +=
2070 cb->outputcharge;
2071 cb->outputcharge = 0;
2072 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
2073 lp->lwp_ru.ru_inblock += cb->inputcharge;
2074 cb->inputcharge = 0;
2075 }
2076 aio_free_entry(cb);
2077 return cb->uaiocb._aiocb_private.error;
2078 }
2079
2080 crit_enter();
2081 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) {
2082 crit_exit();
2083 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
2084 uap->sysmsg_result = cb->uaiocb._aiocb_private.status;
2085 aio_free_entry(cb);
2086 return cb->uaiocb._aiocb_private.error;
2087 }
2088
2089 ki->kaio_flags |= KAIO_WAKEUP;
2090 error = tsleep(p, PCATCH, "aiowc", timo);
2091 crit_exit();
2092
2093 if (error == ERESTART)
2094 return EINTR;
2095 else if (error < 0)
2096 return error;
2097 else if (error == EINTR)
2098 return EINTR;
2099 else if (error == EWOULDBLOCK)
2100 return EAGAIN;
2101 }
2102 #endif /* VFS_AIO */
2103 }
2104
2105 #ifndef VFS_AIO
2106 static int
2107 filt_aioattach(struct knote *kn)
2108 {
2109
2110 return (ENXIO);
2111 }
2112
2113 struct filterops aio_filtops =
2114 { 0, filt_aioattach, NULL, NULL };
2115
2116 #else
2117 /* kqueue attach function */
2118 static int
2119 filt_aioattach(struct knote *kn)
2120 {
2121 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2122
2123 /*
2124 * The aiocbe pointer must be validated before using it, so
2125 * registration is restricted to the kernel; the user cannot
2126 * set EV_FLAG1.
2127 */
2128 if ((kn->kn_flags & EV_FLAG1) == 0)
2129 return (EPERM);
2130 kn->kn_flags &= ~EV_FLAG1;
2131
2132 SLIST_INSERT_HEAD(&aiocbe->klist, kn, kn_selnext);
2133
2134 return (0);
2135 }
2136
2137 /* kqueue detach function */
2138 static void
2139 filt_aiodetach(struct knote *kn)
2140 {
2141 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2142
2143 SLIST_REMOVE(&aiocbe->klist, kn, knote, kn_selnext);
2144 }
2145
2146 /* kqueue filter function */
2147 /*ARGSUSED*/
2148 static int
2149 filt_aio(struct knote *kn, long hint)
2150 {
2151 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2152
2153 kn->kn_data = aiocbe->uaiocb._aiocb_private.error;
2154 if (aiocbe->jobstate != JOBST_JOBFINISHED &&
2155 aiocbe->jobstate != JOBST_JOBBFINISHED)
2156 return (0);
2157 kn->kn_flags |= EV_EOF;
2158 return (1);
2159 }
2160
2161 struct filterops aio_filtops =
2162 { 0, filt_aioattach, filt_aiodetach, filt_aio };
2163 #endif /* VFS_AIO */
DragonFly BSD