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HAMMER 18B/many: Stabilization pass
[dragonfly.git] / sys / kern / vfs_aio.c
blob851e7d38a68fb54bc0baefd27aea128cc477376a
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);
663 mycp->p_fd = NULL;
664 cr = cratom(&mycp->p_ucred);
665 cr->cr_uid = 0;
666 uireplace(&cr->cr_uidinfo, uifind(0));
667 cr->cr_ngroups = 1;
668 cr->cr_groups[0] = 1;
669
670 /* The daemon resides in its own pgrp. */
671 enterpgrp(mycp, mycp->p_pid, 1);
672
673 /* Mark special process type. */
674 mycp->p_flag |= P_SYSTEM | P_KTHREADP;
675
676 /*
677 * Wakeup parent process. (Parent sleeps to keep from blasting away
678 * and creating too many daemons.)
679 */
680 wakeup(mycp);
681 curvm = NULL;
682
683 for (;;) {
684 /*
685 * Take daemon off of free queue
686 */
687 if (aiop->aioprocflags & AIOP_FREE) {
688 crit_enter();
689 TAILQ_REMOVE(&aio_freeproc, aiop, list);
690 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
691 aiop->aioprocflags &= ~AIOP_FREE;
692 crit_exit();
693 }
694 aiop->aioprocflags &= ~AIOP_SCHED;
695
696 /*
697 * Check for jobs.
698 */
699 while ((aiocbe = aio_selectjob(aiop)) != NULL) {
700 cb = &aiocbe->uaiocb;
701 userp = aiocbe->userproc;
702
703 aiocbe->jobstate = JOBST_JOBRUNNING;
704
705 /*
706 * Connect to process address space for user program.
707 */
708 if (curvm != userp->p_vmspace) {
709 pmap_setlwpvm(mylwp, userp->p_vmspace);
710 if (curvm)
711 sysref_put(&curvm->vm_sysref);
712 curvm = userp->p_vmspace;
713 sysref_get(&curvm->vm_sysref);
714 }
715
716 ki = userp->p_aioinfo;
717 lj = aiocbe->lio;
718
719 /* Account for currently active jobs. */
720 ki->kaio_active_count++;
721
722 /* Do the I/O function. */
723 aio_process(aiocbe);
724
725 /* Decrement the active job count. */
726 ki->kaio_active_count--;
727
728 /*
729 * Increment the completion count for wakeup/signal
730 * comparisons.
731 */
732 aiocbe->jobflags |= AIOCBLIST_DONE;
733 ki->kaio_queue_finished_count++;
734 if (lj)
735 lj->lioj_queue_finished_count++;
736 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags
737 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) {
738 ki->kaio_flags &= ~KAIO_WAKEUP;
739 wakeup(userp);
740 }
741
742 crit_enter();
743 if (lj && (lj->lioj_flags &
744 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) {
745 if ((lj->lioj_queue_finished_count ==
746 lj->lioj_queue_count) &&
747 (lj->lioj_buffer_finished_count ==
748 lj->lioj_buffer_count)) {
749 ksignal(userp,
750 lj->lioj_signal.sigev_signo);
751 lj->lioj_flags |=
752 LIOJ_SIGNAL_POSTED;
753 }
754 }
755 crit_exit();
756
757 aiocbe->jobstate = JOBST_JOBFINISHED;
758
759 crit_enter();
760 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
761 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist);
762 crit_exit();
763 KNOTE(&aiocbe->klist, 0);
764
765 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) {
766 wakeup(aiocbe);
767 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
768 }
769
770 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
771 ksignal(userp, cb->aio_sigevent.sigev_signo);
772 }
773 }
774
775 /*
776 * Disconnect from user address space.
777 */
778 if (curvm) {
779 /* swap our original address space back in */
780 pmap_setlwpvm(mylwp, mycp->p_vmspace);
781 sysref_put(&curvm->vm_sysref);
782 curvm = NULL;
783 }
784
785 /*
786 * If we are the first to be put onto the free queue, wakeup
787 * anyone waiting for a daemon.
788 */
789 crit_enter();
790 TAILQ_REMOVE(&aio_activeproc, aiop, list);
791 if (TAILQ_EMPTY(&aio_freeproc))
792 wakeup(&aio_freeproc);
793 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
794 aiop->aioprocflags |= AIOP_FREE;
795 crit_exit();
796
797 /*
798 * If daemon is inactive for a long time, allow it to exit,
799 * thereby freeing resources.
800 */
801 if (((aiop->aioprocflags & AIOP_SCHED) == 0) && tsleep(mycp,
802 0, "aiordy", aiod_lifetime)) {
803 crit_enter();
804 if (TAILQ_EMPTY(&aio_jobs)) {
805 if ((aiop->aioprocflags & AIOP_FREE) &&
806 (num_aio_procs > target_aio_procs)) {
807 TAILQ_REMOVE(&aio_freeproc, aiop, list);
808 crit_exit();
809 zfree(aiop_zone, aiop);
810 num_aio_procs--;
811 #ifdef DIAGNOSTIC
812 if (mycp->p_vmspace->vm_sysref.refcnt <= 1) {
813 kprintf("AIOD: bad vm refcnt for"
814 " exiting daemon: %d\n",
815 mycp->p_vmspace->vm_sysref.refcnt);
816 }
817 #endif
818 exit1(0);
819 }
820 }
821 crit_exit();
822 }
823 }
824 }
825
826 /*
827 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
828 * AIO daemon modifies its environment itself.
829 */
830 static int
831 aio_newproc(void)
832 {
833 int error;
834 struct lwp *lp, *nlp;
835 struct proc *np;
836
837 lp = &lwp0;
838 error = fork1(lp, RFPROC|RFMEM|RFNOWAIT, &np);
839 if (error)
840 return error;
841 nlp = ONLY_LWP_IN_PROC(np);
842 cpu_set_fork_handler(nlp, aio_daemon, curproc);
843 start_forked_proc(lp, np);
844
845 /*
846 * Wait until daemon is started, but continue on just in case to
847 * handle error conditions.
848 */
849 error = tsleep(np, 0, "aiosta", aiod_timeout);
850 num_aio_procs++;
851
852 return error;
853 }
854
855 /*
856 * Try the high-performance, low-overhead physio method for eligible
857 * VCHR devices. This method doesn't use an aio helper thread, and
858 * thus has very low overhead.
859 *
860 * Assumes that the caller, _aio_aqueue(), has incremented the file
861 * structure's reference count, preventing its deallocation for the
862 * duration of this call.
863 */
864 static int
865 aio_qphysio(struct proc *p, struct aiocblist *aiocbe)
866 {
867 int error;
868 struct aiocb *cb;
869 struct file *fp;
870 struct buf *bp;
871 struct vnode *vp;
872 struct kaioinfo *ki;
873 struct aio_liojob *lj;
874 int notify;
875
876 cb = &aiocbe->uaiocb;
877 fp = aiocbe->fd_file;
878
879 if (fp->f_type != DTYPE_VNODE)
880 return (-1);
881
882 vp = (struct vnode *)fp->f_data;
883
884 /*
885 * If its not a disk, we don't want to return a positive error.
886 * It causes the aio code to not fall through to try the thread
887 * way when you're talking to a regular file.
888 */
889 if (!vn_isdisk(vp, &error)) {
890 if (error == ENOTBLK)
891 return (-1);
892 else
893 return (error);
894 }
895
896 if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys)
897 return (-1);
898
899 if (cb->aio_nbytes >
900 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK))
901 return (-1);
902
903 ki = p->p_aioinfo;
904 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count)
905 return (-1);
906
907 ki->kaio_buffer_count++;
908
909 lj = aiocbe->lio;
910 if (lj)
911 lj->lioj_buffer_count++;
912
913 /* Create and build a buffer header for a transfer. */
914 bp = getpbuf(NULL);
915 BUF_KERNPROC(bp);
916
917 /*
918 * Get a copy of the kva from the physical buffer.
919 */
920 bp->b_bio1.bio_caller_info1.ptr = p;
921 error = 0;
922
923 bp->b_cmd = (cb->aio_lio_opcode == LIO_WRITE) ?
924 BUF_CMD_WRITE : BUF_CMD_READ;
925 bp->b_bio1.bio_done = aio_physwakeup;
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 /*
958 * If we had an error invoking the request, or an error in processing
959 * the request before we have returned, we process it as an error in
960 * transfer. Note that such an I/O error is not indicated immediately,
961 * but is returned using the aio_error mechanism. In this case,
962 * aio_suspend will return immediately.
963 */
964 if (bp->b_error || (bp->b_flags & B_ERROR)) {
965 struct aiocb *job = aiocbe->uuaiocb;
966
967 aiocbe->uaiocb._aiocb_private.status = 0;
968 suword(&job->_aiocb_private.status, 0);
969 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
970 suword(&job->_aiocb_private.error, bp->b_error);
971
972 ki->kaio_buffer_finished_count++;
973
974 if (aiocbe->jobstate != JOBST_JOBBFINISHED) {
975 aiocbe->jobstate = JOBST_JOBBFINISHED;
976 aiocbe->jobflags |= AIOCBLIST_DONE;
977 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list);
978 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist);
979 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist);
980 notify = 1;
981 }
982 }
983 crit_exit();
984 if (notify)
985 KNOTE(&aiocbe->klist, 0);
986 return 0;
987
988 doerror:
989 ki->kaio_buffer_count--;
990 if (lj)
991 lj->lioj_buffer_count--;
992 aiocbe->bp = NULL;
993 relpbuf(bp, NULL);
994 return error;
995 }
996
997 /*
998 * This waits/tests physio completion.
999 */
1000 static int
1001 aio_fphysio(struct aiocblist *iocb)
1002 {
1003 struct buf *bp;
1004 int error;
1005
1006 bp = iocb->bp;
1007
1008 crit_enter();
1009 while (bp->b_cmd != BUF_CMD_DONE) {
1010 if (tsleep(bp, 0, "physstr", aiod_timeout)) {
1011 if (bp->b_cmd != BUF_CMD_DONE) {
1012 crit_exit();
1013 return EINPROGRESS;
1014 } else {
1015 break;
1016 }
1017 }
1018 }
1019 crit_exit();
1020
1021 /* Release mapping into kernel space. */
1022 vunmapbuf(bp);
1023 iocb->bp = 0;
1024
1025 error = 0;
1026
1027 /* Check for an error. */
1028 if (bp->b_flags & B_ERROR)
1029 error = bp->b_error;
1030
1031 relpbuf(bp, NULL);
1032 return (error);
1033 }
1034 #endif /* VFS_AIO */
1035
1036 /*
1037 * Wake up aio requests that may be serviceable now.
1038 */
1039 void
1040 aio_swake(struct socket *so, struct signalsockbuf *ssb)
1041 {
1042 #ifndef VFS_AIO
1043 return;
1044 #else
1045 struct aiocblist *cb,*cbn;
1046 struct proc *p;
1047 struct kaioinfo *ki = NULL;
1048 int opcode, wakecount = 0;
1049 struct aioproclist *aiop;
1050
1051 if (ssb == &so->so_snd) {
1052 opcode = LIO_WRITE;
1053 so->so_snd.ssb_flags &= ~SSB_AIO;
1054 } else {
1055 opcode = LIO_READ;
1056 so->so_rcv.ssb_flags &= ~SSB_AIO;
1057 }
1058
1059 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) {
1060 cbn = TAILQ_NEXT(cb, list);
1061 if (opcode == cb->uaiocb.aio_lio_opcode) {
1062 p = cb->userproc;
1063 ki = p->p_aioinfo;
1064 TAILQ_REMOVE(&so->so_aiojobq, cb, list);
1065 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist);
1066 TAILQ_INSERT_TAIL(&aio_jobs, cb, list);
1067 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist);
1068 wakecount++;
1069 if (cb->jobstate != JOBST_JOBQGLOBAL)
1070 panic("invalid queue value");
1071 }
1072 }
1073
1074 while (wakecount--) {
1075 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) {
1076 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1077 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
1078 aiop->aioprocflags &= ~AIOP_FREE;
1079 wakeup(aiop->aioproc);
1080 }
1081 }
1082 #endif /* VFS_AIO */
1083 }
1084
1085 #ifdef VFS_AIO
1086 /*
1087 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR
1088 * technique is done in this code.
1089 */
1090 static int
1091 _aio_aqueue(struct aiocb *job, struct aio_liojob *lj, int type)
1092 {
1093 struct proc *p = curproc;
1094 struct filedesc *fdp;
1095 struct file *fp;
1096 unsigned int fd;
1097 struct socket *so;
1098 int error;
1099 int opcode, user_opcode;
1100 struct aiocblist *aiocbe;
1101 struct aioproclist *aiop;
1102 struct kaioinfo *ki;
1103 struct kevent kev;
1104 struct kqueue *kq;
1105 struct file *kq_fp;
1106
1107 if ((aiocbe = TAILQ_FIRST(&aio_freejobs)) != NULL)
1108 TAILQ_REMOVE(&aio_freejobs, aiocbe, list);
1109 else
1110 aiocbe = zalloc (aiocb_zone);
1111
1112 aiocbe->inputcharge = 0;
1113 aiocbe->outputcharge = 0;
1114 callout_init(&aiocbe->timeout);
1115 SLIST_INIT(&aiocbe->klist);
1116
1117 suword(&job->_aiocb_private.status, -1);
1118 suword(&job->_aiocb_private.error, 0);
1119 suword(&job->_aiocb_private.kernelinfo, -1);
1120
1121 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb));
1122 if (error) {
1123 suword(&job->_aiocb_private.error, error);
1124 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1125 return error;
1126 }
1127 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL &&
1128 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) {
1129 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1130 return EINVAL;
1131 }
1132
1133 /* Save userspace address of the job info. */
1134 aiocbe->uuaiocb = job;
1135
1136 /* Get the opcode. */
1137 user_opcode = aiocbe->uaiocb.aio_lio_opcode;
1138 if (type != LIO_NOP)
1139 aiocbe->uaiocb.aio_lio_opcode = type;
1140 opcode = aiocbe->uaiocb.aio_lio_opcode;
1141
1142 /* Get the fd info for process. */
1143 fdp = p->p_fd;
1144
1145 /*
1146 * Range check file descriptor.
1147 */
1148 fd = aiocbe->uaiocb.aio_fildes;
1149 if (fd >= fdp->fd_nfiles) {
1150 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1151 if (type == 0)
1152 suword(&job->_aiocb_private.error, EBADF);
1153 return EBADF;
1154 }
1155
1156 fp = aiocbe->fd_file = fdp->fd_files[fd].fp;
1157 if ((fp == NULL) || ((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) ==
1158 0))) {
1159 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1160 if (type == 0)
1161 suword(&job->_aiocb_private.error, EBADF);
1162 return EBADF;
1163 }
1164 fhold(fp);
1165
1166 if (aiocbe->uaiocb.aio_offset == -1LL) {
1167 error = EINVAL;
1168 goto aqueue_fail;
1169 }
1170 error = suword(&job->_aiocb_private.kernelinfo, jobrefid);
1171 if (error) {
1172 error = EINVAL;
1173 goto aqueue_fail;
1174 }
1175 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid;
1176 if (jobrefid == LONG_MAX)
1177 jobrefid = 1;
1178 else
1179 jobrefid++;
1180
1181 if (opcode == LIO_NOP) {
1182 fdrop(fp);
1183 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1184 if (type == 0) {
1185 suword(&job->_aiocb_private.error, 0);
1186 suword(&job->_aiocb_private.status, 0);
1187 suword(&job->_aiocb_private.kernelinfo, 0);
1188 }
1189 return 0;
1190 }
1191 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) {
1192 if (type == 0)
1193 suword(&job->_aiocb_private.status, 0);
1194 error = EINVAL;
1195 goto aqueue_fail;
1196 }
1197
1198 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) {
1199 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue;
1200 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sigval_ptr;
1201 }
1202 else {
1203 /*
1204 * This method for requesting kevent-based notification won't
1205 * work on the alpha, since we're passing in a pointer
1206 * via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT-
1207 * based method instead.
1208 */
1209 if (user_opcode == LIO_NOP || user_opcode == LIO_READ ||
1210 user_opcode == LIO_WRITE)
1211 goto no_kqueue;
1212
1213 error = copyin((struct kevent *)(uintptr_t)user_opcode,
1214 &kev, sizeof(kev));
1215 if (error)
1216 goto aqueue_fail;
1217 }
1218 if ((u_int)kev.ident >= fdp->fd_nfiles ||
1219 (kq_fp = fdp->fd_files[kev.ident].fp) == NULL ||
1220 (kq_fp->f_type != DTYPE_KQUEUE)) {
1221 error = EBADF;
1222 goto aqueue_fail;
1223 }
1224 kq = (struct kqueue *)kq_fp->f_data;
1225 kev.ident = (uintptr_t)aiocbe->uuaiocb;
1226 kev.filter = EVFILT_AIO;
1227 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
1228 kev.data = (intptr_t)aiocbe;
1229 /* XXX lwp kqueue_register takes a thread, but only uses its proc */
1230 error = kqueue_register(kq, &kev, FIRST_LWP_IN_PROC(p)->lwp_thread);
1231 aqueue_fail:
1232 if (error) {
1233 fdrop(fp);
1234 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1235 if (type == 0)
1236 suword(&job->_aiocb_private.error, error);
1237 goto done;
1238 }
1239 no_kqueue:
1240
1241 suword(&job->_aiocb_private.error, EINPROGRESS);
1242 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS;
1243 aiocbe->userproc = p;
1244 aiocbe->jobflags = 0;
1245 aiocbe->lio = lj;
1246 ki = p->p_aioinfo;
1247
1248 if (fp->f_type == DTYPE_SOCKET) {
1249 /*
1250 * Alternate queueing for socket ops: Reach down into the
1251 * descriptor to get the socket data. Then check to see if the
1252 * socket is ready to be read or written (based on the requested
1253 * operation).
1254 *
1255 * If it is not ready for io, then queue the aiocbe on the
1256 * socket, and set the flags so we get a call when ssb_notify()
1257 * happens.
1258 */
1259 so = (struct socket *)fp->f_data;
1260 crit_enter();
1261 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode ==
1262 LIO_WRITE) && (!sowriteable(so)))) {
1263 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list);
1264 TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist);
1265 if (opcode == LIO_READ)
1266 so->so_rcv.ssb_flags |= SSB_AIO;
1267 else
1268 so->so_snd.ssb_flags |= SSB_AIO;
1269 aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */
1270 ki->kaio_queue_count++;
1271 num_queue_count++;
1272 crit_exit();
1273 error = 0;
1274 goto done;
1275 }
1276 crit_exit();
1277 }
1278
1279 if ((error = aio_qphysio(p, aiocbe)) == 0)
1280 goto done;
1281 if (error > 0) {
1282 suword(&job->_aiocb_private.status, 0);
1283 aiocbe->uaiocb._aiocb_private.error = error;
1284 suword(&job->_aiocb_private.error, error);
1285 goto done;
1286 }
1287
1288 /* No buffer for daemon I/O. */
1289 aiocbe->bp = NULL;
1290
1291 ki->kaio_queue_count++;
1292 if (lj)
1293 lj->lioj_queue_count++;
1294 crit_enter();
1295 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
1296 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
1297 crit_exit();
1298 aiocbe->jobstate = JOBST_JOBQGLOBAL;
1299
1300 num_queue_count++;
1301 error = 0;
1302
1303 /*
1304 * If we don't have a free AIO process, and we are below our quota, then
1305 * start one. Otherwise, depend on the subsequent I/O completions to
1306 * pick-up this job. If we don't successfully create the new process
1307 * (thread) due to resource issues, we return an error for now (EAGAIN),
1308 * which is likely not the correct thing to do.
1309 */
1310 crit_enter();
1311 retryproc:
1312 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1313 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1314 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
1315 aiop->aioprocflags &= ~AIOP_FREE;
1316 wakeup(aiop->aioproc);
1317 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
1318 ((ki->kaio_active_count + num_aio_resv_start) <
1319 ki->kaio_maxactive_count)) {
1320 num_aio_resv_start++;
1321 if ((error = aio_newproc()) == 0) {
1322 num_aio_resv_start--;
1323 goto retryproc;
1324 }
1325 num_aio_resv_start--;
1326 }
1327 crit_exit();
1328 done:
1329 return error;
1330 }
1331
1332 /*
1333 * This routine queues an AIO request, checking for quotas.
1334 */
1335 static int
1336 aio_aqueue(struct aiocb *job, int type)
1337 {
1338 struct proc *p = curproc;
1339 struct kaioinfo *ki;
1340
1341 if (p->p_aioinfo == NULL)
1342 aio_init_aioinfo(p);
1343
1344 if (num_queue_count >= max_queue_count)
1345 return EAGAIN;
1346
1347 ki = p->p_aioinfo;
1348 if (ki->kaio_queue_count >= ki->kaio_qallowed_count)
1349 return EAGAIN;
1350
1351 return _aio_aqueue(job, NULL, type);
1352 }
1353 #endif /* VFS_AIO */
1354
1355 /*
1356 * Support the aio_return system call, as a side-effect, kernel resources are
1357 * released.
1358 */
1359 int
1360 sys_aio_return(struct aio_return_args *uap)
1361 {
1362 #ifndef VFS_AIO
1363 return ENOSYS;
1364 #else
1365 struct proc *p = curproc;
1366 struct lwp *lp = curthread->td_lwp;
1367 long jobref;
1368 struct aiocblist *cb, *ncb;
1369 struct aiocb *ujob;
1370 struct kaioinfo *ki;
1371
1372 ki = p->p_aioinfo;
1373 if (ki == NULL)
1374 return EINVAL;
1375
1376 ujob = uap->aiocbp;
1377
1378 jobref = fuword(&ujob->_aiocb_private.kernelinfo);
1379 if (jobref == -1 || jobref == 0)
1380 return EINVAL;
1381
1382 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1383 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) ==
1384 jobref) {
1385 if (ujob == cb->uuaiocb) {
1386 uap->sysmsg_result =
1387 cb->uaiocb._aiocb_private.status;
1388 } else
1389 uap->sysmsg_result = EFAULT;
1390 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
1391 lp->lwp_ru.ru_oublock += cb->outputcharge;
1392 cb->outputcharge = 0;
1393 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
1394 lp->lwp_ru.ru_inblock += cb->inputcharge;
1395 cb->inputcharge = 0;
1396 }
1397 aio_free_entry(cb);
1398 return 0;
1399 }
1400 }
1401 crit_enter();
1402 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) {
1403 ncb = TAILQ_NEXT(cb, plist);
1404 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo)
1405 == jobref) {
1406 crit_exit();
1407 if (ujob == cb->uuaiocb) {
1408 uap->sysmsg_result =
1409 cb->uaiocb._aiocb_private.status;
1410 } else
1411 uap->sysmsg_result = EFAULT;
1412 aio_free_entry(cb);
1413 return 0;
1414 }
1415 }
1416 crit_exit();
1417
1418 return (EINVAL);
1419 #endif /* VFS_AIO */
1420 }
1421
1422 /*
1423 * Allow a process to wakeup when any of the I/O requests are completed.
1424 */
1425 int
1426 sys_aio_suspend(struct aio_suspend_args *uap)
1427 {
1428 #ifndef VFS_AIO
1429 return ENOSYS;
1430 #else
1431 struct proc *p = curproc;
1432 struct timeval atv;
1433 struct timespec ts;
1434 struct aiocb *const *cbptr, *cbp;
1435 struct kaioinfo *ki;
1436 struct aiocblist *cb;
1437 int i;
1438 int njoblist;
1439 int error, timo;
1440 long *ijoblist;
1441 struct aiocb **ujoblist;
1442
1443 if (uap->nent > AIO_LISTIO_MAX)
1444 return EINVAL;
1445
1446 timo = 0;
1447 if (uap->timeout) {
1448 /* Get timespec struct. */
1449 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
1450 return error;
1451
1452 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
1453 return (EINVAL);
1454
1455 TIMESPEC_TO_TIMEVAL(&atv, &ts);
1456 if (itimerfix(&atv))
1457 return (EINVAL);
1458 timo = tvtohz_high(&atv);
1459 }
1460
1461 ki = p->p_aioinfo;
1462 if (ki == NULL)
1463 return EAGAIN;
1464
1465 njoblist = 0;
1466 ijoblist = zalloc(aiol_zone);
1467 ujoblist = zalloc(aiol_zone);
1468 cbptr = uap->aiocbp;
1469
1470 for (i = 0; i < uap->nent; i++) {
1471 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
1472 if (cbp == 0)
1473 continue;
1474 ujoblist[njoblist] = cbp;
1475 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo);
1476 njoblist++;
1477 }
1478
1479 if (njoblist == 0) {
1480 zfree(aiol_zone, ijoblist);
1481 zfree(aiol_zone, ujoblist);
1482 return 0;
1483 }
1484
1485 error = 0;
1486 for (;;) {
1487 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1488 for (i = 0; i < njoblist; i++) {
1489 if (((intptr_t)
1490 cb->uaiocb._aiocb_private.kernelinfo) ==
1491 ijoblist[i]) {
1492 if (ujoblist[i] != cb->uuaiocb)
1493 error = EINVAL;
1494 zfree(aiol_zone, ijoblist);
1495 zfree(aiol_zone, ujoblist);
1496 return error;
1497 }
1498 }
1499 }
1500
1501 crit_enter();
1502 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb =
1503 TAILQ_NEXT(cb, plist)) {
1504 for (i = 0; i < njoblist; i++) {
1505 if (((intptr_t)
1506 cb->uaiocb._aiocb_private.kernelinfo) ==
1507 ijoblist[i]) {
1508 crit_exit();
1509 if (ujoblist[i] != cb->uuaiocb)
1510 error = EINVAL;
1511 zfree(aiol_zone, ijoblist);
1512 zfree(aiol_zone, ujoblist);
1513 return error;
1514 }
1515 }
1516 }
1517
1518 ki->kaio_flags |= KAIO_WAKEUP;
1519 error = tsleep(p, PCATCH, "aiospn", timo);
1520 crit_exit();
1521
1522 if (error == ERESTART || error == EINTR) {
1523 zfree(aiol_zone, ijoblist);
1524 zfree(aiol_zone, ujoblist);
1525 return EINTR;
1526 } else if (error == EWOULDBLOCK) {
1527 zfree(aiol_zone, ijoblist);
1528 zfree(aiol_zone, ujoblist);
1529 return EAGAIN;
1530 }
1531 }
1532
1533 /* NOTREACHED */
1534 return EINVAL;
1535 #endif /* VFS_AIO */
1536 }
1537
1538 /*
1539 * aio_cancel cancels any non-physio aio operations not currently in
1540 * progress.
1541 */
1542 int
1543 sys_aio_cancel(struct aio_cancel_args *uap)
1544 {
1545 #ifndef VFS_AIO
1546 return ENOSYS;
1547 #else
1548 struct proc *p = curproc;
1549 struct kaioinfo *ki;
1550 struct aiocblist *cbe, *cbn;
1551 struct file *fp;
1552 struct filedesc *fdp;
1553 struct socket *so;
1554 struct proc *po;
1555 int error;
1556 int cancelled=0;
1557 int notcancelled=0;
1558 struct vnode *vp;
1559
1560 fdp = p->p_fd;
1561 if ((u_int)uap->fd >= fdp->fd_nfiles ||
1562 (fp = fdp->fd_files[uap->fd].fp) == NULL)
1563 return (EBADF);
1564
1565 if (fp->f_type == DTYPE_VNODE) {
1566 vp = (struct vnode *)fp->f_data;
1567
1568 if (vn_isdisk(vp,&error)) {
1569 uap->sysmsg_result = AIO_NOTCANCELED;
1570 return 0;
1571 }
1572 } else if (fp->f_type == DTYPE_SOCKET) {
1573 so = (struct socket *)fp->f_data;
1574
1575 crit_enter();
1576
1577 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) {
1578 cbn = TAILQ_NEXT(cbe, list);
1579 if ((uap->aiocbp == NULL) ||
1580 (uap->aiocbp == cbe->uuaiocb) ) {
1581 po = cbe->userproc;
1582 ki = po->p_aioinfo;
1583 TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
1584 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist);
1585 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist);
1586 if (ki->kaio_flags & KAIO_WAKEUP) {
1587 wakeup(po);
1588 }
1589 cbe->jobstate = JOBST_JOBFINISHED;
1590 cbe->uaiocb._aiocb_private.status=-1;
1591 cbe->uaiocb._aiocb_private.error=ECANCELED;
1592 cancelled++;
1593 /* XXX cancelled, knote? */
1594 if (cbe->uaiocb.aio_sigevent.sigev_notify ==
1595 SIGEV_SIGNAL)
1596 ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
1597 if (uap->aiocbp)
1598 break;
1599 }
1600 }
1601 crit_exit();
1602
1603 if ((cancelled) && (uap->aiocbp)) {
1604 uap->sysmsg_result = AIO_CANCELED;
1605 return 0;
1606 }
1607 }
1608 ki=p->p_aioinfo;
1609 if (ki == NULL)
1610 goto done;
1611 crit_enter();
1612
1613 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) {
1614 cbn = TAILQ_NEXT(cbe, plist);
1615
1616 if ((uap->fd == cbe->uaiocb.aio_fildes) &&
1617 ((uap->aiocbp == NULL ) ||
1618 (uap->aiocbp == cbe->uuaiocb))) {
1619
1620 if (cbe->jobstate == JOBST_JOBQGLOBAL) {
1621 TAILQ_REMOVE(&aio_jobs, cbe, list);
1622 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
1623 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe,
1624 plist);
1625 cancelled++;
1626 ki->kaio_queue_finished_count++;
1627 cbe->jobstate = JOBST_JOBFINISHED;
1628 cbe->uaiocb._aiocb_private.status = -1;
1629 cbe->uaiocb._aiocb_private.error = ECANCELED;
1630 /* XXX cancelled, knote? */
1631 if (cbe->uaiocb.aio_sigevent.sigev_notify ==
1632 SIGEV_SIGNAL)
1633 ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
1634 } else {
1635 notcancelled++;
1636 }
1637 }
1638 }
1639 crit_exit();
1640 done:
1641 if (notcancelled) {
1642 uap->sysmsg_result = AIO_NOTCANCELED;
1643 return 0;
1644 }
1645 if (cancelled) {
1646 uap->sysmsg_result = AIO_CANCELED;
1647 return 0;
1648 }
1649 uap->sysmsg_result = AIO_ALLDONE;
1650
1651 return 0;
1652 #endif /* VFS_AIO */
1653 }
1654
1655 /*
1656 * aio_error is implemented in the kernel level for compatibility purposes only.
1657 * For a user mode async implementation, it would be best to do it in a userland
1658 * subroutine.
1659 */
1660 int
1661 sys_aio_error(struct aio_error_args *uap)
1662 {
1663 #ifndef VFS_AIO
1664 return ENOSYS;
1665 #else
1666 struct proc *p = curproc;
1667 struct aiocblist *cb;
1668 struct kaioinfo *ki;
1669 long jobref;
1670
1671 ki = p->p_aioinfo;
1672 if (ki == NULL)
1673 return EINVAL;
1674
1675 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo);
1676 if ((jobref == -1) || (jobref == 0))
1677 return EINVAL;
1678
1679 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1680 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1681 jobref) {
1682 uap->sysmsg_result = cb->uaiocb._aiocb_private.error;
1683 return 0;
1684 }
1685 }
1686
1687 crit_enter();
1688
1689 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb,
1690 plist)) {
1691 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1692 jobref) {
1693 uap->sysmsg_result = EINPROGRESS;
1694 crit_exit();
1695 return 0;
1696 }
1697 }
1698
1699 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb,
1700 plist)) {
1701 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1702 jobref) {
1703 uap->sysmsg_result = EINPROGRESS;
1704 crit_exit();
1705 return 0;
1706 }
1707 }
1708 crit_exit();
1709
1710 crit_enter();
1711 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb,
1712 plist)) {
1713 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1714 jobref) {
1715 uap->sysmsg_result = cb->uaiocb._aiocb_private.error;
1716 crit_exit();
1717 return 0;
1718 }
1719 }
1720
1721 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb,
1722 plist)) {
1723 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1724 jobref) {
1725 uap->sysmsg_result = EINPROGRESS;
1726 crit_exit();
1727 return 0;
1728 }
1729 }
1730 crit_exit();
1731
1732 #if (0)
1733 /*
1734 * Hack for lio.
1735 */
1736 status = fuword(&uap->aiocbp->_aiocb_private.status);
1737 if (status == -1)
1738 return fuword(&uap->aiocbp->_aiocb_private.error);
1739 #endif
1740 return EINVAL;
1741 #endif /* VFS_AIO */
1742 }
1743
1744 /* syscall - asynchronous read from a file (REALTIME) */
1745 int
1746 sys_aio_read(struct aio_read_args *uap)
1747 {
1748 #ifndef VFS_AIO
1749 return ENOSYS;
1750 #else
1751 return aio_aqueue(uap->aiocbp, LIO_READ);
1752 #endif /* VFS_AIO */
1753 }
1754
1755 /* syscall - asynchronous write to a file (REALTIME) */
1756 int
1757 sys_aio_write(struct aio_write_args *uap)
1758 {
1759 #ifndef VFS_AIO
1760 return ENOSYS;
1761 #else
1762 return aio_aqueue(uap->aiocbp, LIO_WRITE);
1763 #endif /* VFS_AIO */
1764 }
1765
1766 /* syscall - XXX undocumented */
1767 int
1768 sys_lio_listio(struct lio_listio_args *uap)
1769 {
1770 #ifndef VFS_AIO
1771 return ENOSYS;
1772 #else
1773 struct proc *p = curproc;
1774 struct lwp *lp = curthread->td_lwp;
1775 int nent, nentqueued;
1776 struct aiocb *iocb, * const *cbptr;
1777 struct aiocblist *cb;
1778 struct kaioinfo *ki;
1779 struct aio_liojob *lj;
1780 int error, runningcode;
1781 int nerror;
1782 int i;
1783
1784 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
1785 return EINVAL;
1786
1787 nent = uap->nent;
1788 if (nent > AIO_LISTIO_MAX)
1789 return EINVAL;
1790
1791 if (p->p_aioinfo == NULL)
1792 aio_init_aioinfo(p);
1793
1794 if ((nent + num_queue_count) > max_queue_count)
1795 return EAGAIN;
1796
1797 ki = p->p_aioinfo;
1798 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count)
1799 return EAGAIN;
1800
1801 lj = zalloc(aiolio_zone);
1802 if (!lj)
1803 return EAGAIN;
1804
1805 lj->lioj_flags = 0;
1806 lj->lioj_buffer_count = 0;
1807 lj->lioj_buffer_finished_count = 0;
1808 lj->lioj_queue_count = 0;
1809 lj->lioj_queue_finished_count = 0;
1810 lj->lioj_ki = ki;
1811
1812 /*
1813 * Setup signal.
1814 */
1815 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
1816 error = copyin(uap->sig, &lj->lioj_signal,
1817 sizeof(lj->lioj_signal));
1818 if (error) {
1819 zfree(aiolio_zone, lj);
1820 return error;
1821 }
1822 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
1823 zfree(aiolio_zone, lj);
1824 return EINVAL;
1825 }
1826 lj->lioj_flags |= LIOJ_SIGNAL;
1827 lj->lioj_flags &= ~LIOJ_SIGNAL_POSTED;
1828 } else
1829 lj->lioj_flags &= ~LIOJ_SIGNAL;
1830
1831 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
1832 /*
1833 * Get pointers to the list of I/O requests.
1834 */
1835 nerror = 0;
1836 nentqueued = 0;
1837 cbptr = uap->acb_list;
1838 for (i = 0; i < uap->nent; i++) {
1839 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
1840 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) {
1841 error = _aio_aqueue(iocb, lj, 0);
1842 if (error == 0)
1843 nentqueued++;
1844 else
1845 nerror++;
1846 }
1847 }
1848
1849 /*
1850 * If we haven't queued any, then just return error.
1851 */
1852 if (nentqueued == 0)
1853 return 0;
1854
1855 /*
1856 * Calculate the appropriate error return.
1857 */
1858 runningcode = 0;
1859 if (nerror)
1860 runningcode = EIO;
1861
1862 if (uap->mode == LIO_WAIT) {
1863 int command, found, jobref;
1864
1865 for (;;) {
1866 found = 0;
1867 for (i = 0; i < uap->nent; i++) {
1868 /*
1869 * Fetch address of the control buf pointer in
1870 * user space.
1871 */
1872 iocb = (struct aiocb *)
1873 (intptr_t)fuword(&cbptr[i]);
1874 if (((intptr_t)iocb == -1) || ((intptr_t)iocb
1875 == 0))
1876 continue;
1877
1878 /*
1879 * Fetch the associated command from user space.
1880 */
1881 command = fuword(&iocb->aio_lio_opcode);
1882 if (command == LIO_NOP) {
1883 found++;
1884 continue;
1885 }
1886
1887 jobref = fuword(&iocb->_aiocb_private.kernelinfo);
1888
1889 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1890 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo)
1891 == jobref) {
1892 if (cb->uaiocb.aio_lio_opcode
1893 == LIO_WRITE) {
1894 lp->lwp_ru.ru_oublock +=
1895 cb->outputcharge;
1896 cb->outputcharge = 0;
1897 } else if (cb->uaiocb.aio_lio_opcode
1898 == LIO_READ) {
1899 lp->lwp_ru.ru_inblock +=
1900 cb->inputcharge;
1901 cb->inputcharge = 0;
1902 }
1903 found++;
1904 break;
1905 }
1906 }
1907
1908 crit_enter();
1909 TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) {
1910 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo)
1911 == jobref) {
1912 found++;
1913 break;
1914 }
1915 }
1916 crit_exit();
1917 }
1918
1919 /*
1920 * If all I/Os have been disposed of, then we can
1921 * return.
1922 */
1923 if (found == nentqueued)
1924 return runningcode;
1925
1926 ki->kaio_flags |= KAIO_WAKEUP;
1927 error = tsleep(p, PCATCH, "aiospn", 0);
1928
1929 if (error == EINTR)
1930 return EINTR;
1931 else if (error == EWOULDBLOCK)
1932 return EAGAIN;
1933 }
1934 }
1935
1936 return runningcode;
1937 #endif /* VFS_AIO */
1938 }
1939
1940 #ifdef VFS_AIO
1941 /*
1942 * This is a weird hack so that we can post a signal. It is safe to do so from
1943 * a timeout routine, but *not* from an interrupt routine.
1944 */
1945 static void
1946 process_signal(void *aioj)
1947 {
1948 struct aiocblist *aiocbe = aioj;
1949 struct aio_liojob *lj = aiocbe->lio;
1950 struct aiocb *cb = &aiocbe->uaiocb;
1951
1952 if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) &&
1953 (lj->lioj_queue_count == lj->lioj_queue_finished_count)) {
1954 ksignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo);
1955 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
1956 }
1957
1958 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL)
1959 ksignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo);
1960 }
1961
1962 /*
1963 * Interrupt handler for physio, performs the necessary process wakeups, and
1964 * signals.
1965 */
1966 static void
1967 aio_physwakeup(struct bio *bio)
1968 {
1969 struct buf *bp = bio->bio_buf;
1970 struct aiocblist *aiocbe;
1971 struct proc *p;
1972 struct kaioinfo *ki;
1973 struct aio_liojob *lj;
1974
1975 aiocbe = bio->bio_caller_info2.ptr;
1976
1977 if (aiocbe) {
1978 p = bio->bio_caller_info1.ptr;
1979
1980 aiocbe->jobstate = JOBST_JOBBFINISHED;
1981 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid;
1982 aiocbe->uaiocb._aiocb_private.error = 0;
1983 aiocbe->jobflags |= AIOCBLIST_DONE;
1984
1985 if (bp->b_flags & B_ERROR)
1986 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
1987
1988 lj = aiocbe->lio;
1989 if (lj) {
1990 lj->lioj_buffer_finished_count++;
1991
1992 /*
1993 * wakeup/signal if all of the interrupt jobs are done.
1994 */
1995 if (lj->lioj_buffer_finished_count ==
1996 lj->lioj_buffer_count) {
1997 /*
1998 * Post a signal if it is called for.
1999 */
2000 if ((lj->lioj_flags &
2001 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) ==
2002 LIOJ_SIGNAL) {
2003 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
2004 callout_reset(&aiocbe->timeout, 0,
2005 process_signal, aiocbe);
2006 }
2007 }
2008 }
2009
2010 ki = p->p_aioinfo;
2011 if (ki) {
2012 ki->kaio_buffer_finished_count++;
2013 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list);
2014 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist);
2015 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist);
2016
2017 KNOTE(&aiocbe->klist, 0);
2018 /* Do the wakeup. */
2019 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) {
2020 ki->kaio_flags &= ~KAIO_WAKEUP;
2021 wakeup(p);
2022 }
2023 }
2024
2025 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
2026 callout_reset(&aiocbe->timeout, 0,
2027 process_signal, aiocbe);
2028 }
2029 }
2030 bp->b_cmd = BUF_CMD_DONE;
2031 wakeup(bp);
2032 }
2033 #endif /* VFS_AIO */
2034
2035 /* syscall - wait for the next completion of an aio request */
2036 int
2037 sys_aio_waitcomplete(struct aio_waitcomplete_args *uap)
2038 {
2039 #ifndef VFS_AIO
2040 return ENOSYS;
2041 #else
2042 struct proc *p = curproc;
2043 struct lwp *lp = curthread->td_lwp;
2044 struct timeval atv;
2045 struct timespec ts;
2046 struct kaioinfo *ki;
2047 struct aiocblist *cb = NULL;
2048 int error, timo;
2049
2050 suword(uap->aiocbp, (int)NULL);
2051
2052 timo = 0;
2053 if (uap->timeout) {
2054 /* Get timespec struct. */
2055 error = copyin(uap->timeout, &ts, sizeof(ts));
2056 if (error)
2057 return error;
2058
2059 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000))
2060 return (EINVAL);
2061
2062 TIMESPEC_TO_TIMEVAL(&atv, &ts);
2063 if (itimerfix(&atv))
2064 return (EINVAL);
2065 timo = tvtohz_high(&atv);
2066 }
2067
2068 ki = p->p_aioinfo;
2069 if (ki == NULL)
2070 return EAGAIN;
2071
2072 for (;;) {
2073 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) {
2074 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
2075 uap->sysmsg_result = cb->uaiocb._aiocb_private.status;
2076 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
2077 lp->lwp_ru.ru_oublock +=
2078 cb->outputcharge;
2079 cb->outputcharge = 0;
2080 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
2081 lp->lwp_ru.ru_inblock += cb->inputcharge;
2082 cb->inputcharge = 0;
2083 }
2084 aio_free_entry(cb);
2085 return cb->uaiocb._aiocb_private.error;
2086 }
2087
2088 crit_enter();
2089 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) {
2090 crit_exit();
2091 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
2092 uap->sysmsg_result = cb->uaiocb._aiocb_private.status;
2093 aio_free_entry(cb);
2094 return cb->uaiocb._aiocb_private.error;
2095 }
2096
2097 ki->kaio_flags |= KAIO_WAKEUP;
2098 error = tsleep(p, PCATCH, "aiowc", timo);
2099 crit_exit();
2100
2101 if (error == ERESTART)
2102 return EINTR;
2103 else if (error < 0)
2104 return error;
2105 else if (error == EINTR)
2106 return EINTR;
2107 else if (error == EWOULDBLOCK)
2108 return EAGAIN;
2109 }
2110 #endif /* VFS_AIO */
2111 }
2112
2113 #ifndef VFS_AIO
2114 static int
2115 filt_aioattach(struct knote *kn)
2116 {
2117
2118 return (ENXIO);
2119 }
2120
2121 struct filterops aio_filtops =
2122 { 0, filt_aioattach, NULL, NULL };
2123
2124 #else
2125 /* kqueue attach function */
2126 static int
2127 filt_aioattach(struct knote *kn)
2128 {
2129 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2130
2131 /*
2132 * The aiocbe pointer must be validated before using it, so
2133 * registration is restricted to the kernel; the user cannot
2134 * set EV_FLAG1.
2135 */
2136 if ((kn->kn_flags & EV_FLAG1) == 0)
2137 return (EPERM);
2138 kn->kn_flags &= ~EV_FLAG1;
2139
2140 SLIST_INSERT_HEAD(&aiocbe->klist, kn, kn_selnext);
2141
2142 return (0);
2143 }
2144
2145 /* kqueue detach function */
2146 static void
2147 filt_aiodetach(struct knote *kn)
2148 {
2149 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2150
2151 SLIST_REMOVE(&aiocbe->klist, kn, knote, kn_selnext);
2152 }
2153
2154 /* kqueue filter function */
2155 /*ARGSUSED*/
2156 static int
2157 filt_aio(struct knote *kn, long hint)
2158 {
2159 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2160
2161 kn->kn_data = aiocbe->uaiocb._aiocb_private.error;
2162 if (aiocbe->jobstate != JOBST_JOBFINISHED &&
2163 aiocbe->jobstate != JOBST_JOBBFINISHED)
2164 return (0);
2165 kn->kn_flags |= EV_EOF;
2166 return (1);
2167 }
2168
2169 struct filterops aio_filtops =
2170 { 0, filt_aioattach, filt_aiodetach, filt_aio };
2171 #endif /* VFS_AIO */
DragonFly BSD