FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_aio.c
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: releng/5.0/sys/kern/vfs_aio.c 106998 2002-11-17 04:15:34Z alfred $
17 */
18
19 /*
20 * This file contains support for the POSIX 1003.1B AIO/LIO facility.
21 */
22
23 #include <sys/param.h>
24 #include <sys/systm.h>
25 #include <sys/malloc.h>
26 #include <sys/bio.h>
27 #include <sys/buf.h>
28 #include <sys/sysproto.h>
29 #include <sys/filedesc.h>
30 #include <sys/kernel.h>
31 #include <sys/kthread.h>
32 #include <sys/fcntl.h>
33 #include <sys/file.h>
34 #include <sys/lock.h>
35 #include <sys/mutex.h>
36 #include <sys/unistd.h>
37 #include <sys/proc.h>
38 #include <sys/resourcevar.h>
39 #include <sys/signalvar.h>
40 #include <sys/protosw.h>
41 #include <sys/socketvar.h>
42 #include <sys/syscall.h>
43 #include <sys/sysent.h>
44 #include <sys/sysctl.h>
45 #include <sys/sx.h>
46 #include <sys/vnode.h>
47 #include <sys/conf.h>
48 #include <sys/event.h>
49
50 #include <posix4/posix4.h>
51 #include <vm/vm.h>
52 #include <vm/vm_extern.h>
53 #include <vm/pmap.h>
54 #include <vm/vm_map.h>
55 #include <vm/uma.h>
56 #include <sys/aio.h>
57
58 #include <machine/limits.h>
59
60 #include "opt_vfs_aio.h"
61
62 /*
63 * Counter for allocating reference ids to new jobs. Wrapped to 1 on
64 * overflow.
65 */
66 static long jobrefid;
67
68 #define JOBST_NULL 0x0
69 #define JOBST_JOBQGLOBAL 0x2
70 #define JOBST_JOBRUNNING 0x3
71 #define JOBST_JOBFINISHED 0x4
72 #define JOBST_JOBQBUF 0x5
73 #define JOBST_JOBBFINISHED 0x6
74
75 #ifndef MAX_AIO_PER_PROC
76 #define MAX_AIO_PER_PROC 32
77 #endif
78
79 #ifndef MAX_AIO_QUEUE_PER_PROC
80 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */
81 #endif
82
83 #ifndef MAX_AIO_PROCS
84 #define MAX_AIO_PROCS 32
85 #endif
86
87 #ifndef MAX_AIO_QUEUE
88 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */
89 #endif
90
91 #ifndef TARGET_AIO_PROCS
92 #define TARGET_AIO_PROCS 4
93 #endif
94
95 #ifndef MAX_BUF_AIO
96 #define MAX_BUF_AIO 16
97 #endif
98
99 #ifndef AIOD_TIMEOUT_DEFAULT
100 #define AIOD_TIMEOUT_DEFAULT (10 * hz)
101 #endif
102
103 #ifndef AIOD_LIFETIME_DEFAULT
104 #define AIOD_LIFETIME_DEFAULT (30 * hz)
105 #endif
106
107 SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management");
108
109 static int max_aio_procs = MAX_AIO_PROCS;
110 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs,
111 CTLFLAG_RW, &max_aio_procs, 0,
112 "Maximum number of kernel threads to use for handling async IO ");
113
114 static int num_aio_procs = 0;
115 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs,
116 CTLFLAG_RD, &num_aio_procs, 0,
117 "Number of presently active kernel threads for async IO");
118
119 /*
120 * The code will adjust the actual number of AIO processes towards this
121 * number when it gets a chance.
122 */
123 static int target_aio_procs = TARGET_AIO_PROCS;
124 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs,
125 0, "Preferred number of ready kernel threads for async IO");
126
127 static int max_queue_count = MAX_AIO_QUEUE;
128 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0,
129 "Maximum number of aio requests to queue, globally");
130
131 static int num_queue_count = 0;
132 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0,
133 "Number of queued aio requests");
134
135 static int num_buf_aio = 0;
136 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
137 "Number of aio requests presently handled by the buf subsystem");
138
139 /* Number of async I/O thread in the process of being started */
140 /* XXX This should be local to _aio_aqueue() */
141 static int num_aio_resv_start = 0;
142
143 static int aiod_timeout;
144 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0,
145 "Timeout value for synchronous aio operations");
146
147 static int aiod_lifetime;
148 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0,
149 "Maximum lifetime for idle aiod");
150
151 static int unloadable = 0;
152 SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0,
153 "Allow unload of aio (not recommended)");
154
155
156 static int max_aio_per_proc = MAX_AIO_PER_PROC;
157 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
158 0, "Maximum active aio requests per process (stored in the process)");
159
160 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
161 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
162 &max_aio_queue_per_proc, 0,
163 "Maximum queued aio requests per process (stored in the process)");
164
165 static int max_buf_aio = MAX_BUF_AIO;
166 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
167 "Maximum buf aio requests per process (stored in the process)");
168
169 struct aiocblist {
170 TAILQ_ENTRY(aiocblist) list; /* List of jobs */
171 TAILQ_ENTRY(aiocblist) plist; /* List of jobs for proc */
172 int jobflags;
173 int jobstate;
174 int inputcharge;
175 int outputcharge;
176 struct callout_handle timeouthandle;
177 struct buf *bp; /* Buffer pointer */
178 struct proc *userproc; /* User process */ /* Not td! */
179 struct ucred *cred; /* Active credential when created */
180 struct file *fd_file; /* Pointer to file structure */
181 struct aio_liojob *lio; /* Optional lio job */
182 struct aiocb *uuaiocb; /* Pointer in userspace of aiocb */
183 struct klist klist; /* list of knotes */
184 struct aiocb uaiocb; /* Kernel I/O control block */
185 };
186
187 /* jobflags */
188 #define AIOCBLIST_RUNDOWN 0x4
189 #define AIOCBLIST_DONE 0x10
190
191 /*
192 * AIO process info
193 */
194 #define AIOP_FREE 0x1 /* proc on free queue */
195 #define AIOP_SCHED 0x2 /* proc explicitly scheduled */
196
197 struct aiothreadlist {
198 int aiothreadflags; /* AIO proc flags */
199 TAILQ_ENTRY(aiothreadlist) list; /* List of processes */
200 struct thread *aiothread; /* The AIO thread */
201 };
202
203 /*
204 * data-structure for lio signal management
205 */
206 struct aio_liojob {
207 int lioj_flags;
208 int lioj_buffer_count;
209 int lioj_buffer_finished_count;
210 int lioj_queue_count;
211 int lioj_queue_finished_count;
212 struct sigevent lioj_signal; /* signal on all I/O done */
213 TAILQ_ENTRY(aio_liojob) lioj_list;
214 struct kaioinfo *lioj_ki;
215 };
216 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */
217 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */
218
219 /*
220 * per process aio data structure
221 */
222 struct kaioinfo {
223 int kaio_flags; /* per process kaio flags */
224 int kaio_maxactive_count; /* maximum number of AIOs */
225 int kaio_active_count; /* number of currently used AIOs */
226 int kaio_qallowed_count; /* maxiumu size of AIO queue */
227 int kaio_queue_count; /* size of AIO queue */
228 int kaio_ballowed_count; /* maximum number of buffers */
229 int kaio_queue_finished_count; /* number of daemon jobs finished */
230 int kaio_buffer_count; /* number of physio buffers */
231 int kaio_buffer_finished_count; /* count of I/O done */
232 struct proc *kaio_p; /* process that uses this kaio block */
233 TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */
234 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */
235 TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */
236 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */
237 TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */
238 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */
239 };
240
241 #define KAIO_RUNDOWN 0x1 /* process is being run down */
242 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */
243
244 static TAILQ_HEAD(,aiothreadlist) aio_activeproc; /* Active daemons */
245 static TAILQ_HEAD(,aiothreadlist) aio_freeproc; /* Idle daemons */
246 static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */
247 static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */
248
249 static void aio_init_aioinfo(struct proc *p);
250 static void aio_onceonly(void);
251 static int aio_free_entry(struct aiocblist *aiocbe);
252 static void aio_process(struct aiocblist *aiocbe);
253 static int aio_newproc(void);
254 static int aio_aqueue(struct thread *td, struct aiocb *job, int type);
255 static void aio_physwakeup(struct buf *bp);
256 static void aio_proc_rundown(struct proc *p);
257 static int aio_fphysio(struct aiocblist *aiocbe);
258 static int aio_qphysio(struct proc *p, struct aiocblist *iocb);
259 static void aio_daemon(void *uproc);
260 static void aio_swake_cb(struct socket *, struct sockbuf *);
261 static int aio_unload(void);
262 static void process_signal(void *aioj);
263 static int filt_aioattach(struct knote *kn);
264 static void filt_aiodetach(struct knote *kn);
265 static int filt_aio(struct knote *kn, long hint);
266
267 /*
268 * Zones for:
269 * kaio Per process async io info
270 * aiop async io thread data
271 * aiocb async io jobs
272 * aiol list io job pointer - internal to aio_suspend XXX
273 * aiolio list io jobs
274 */
275 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone;
276
277 /* kqueue filters for aio */
278 static struct filterops aio_filtops =
279 { 0, filt_aioattach, filt_aiodetach, filt_aio };
280
281 /*
282 * Main operations function for use as a kernel module.
283 */
284 static int
285 aio_modload(struct module *module, int cmd, void *arg)
286 {
287 int error = 0;
288
289 switch (cmd) {
290 case MOD_LOAD:
291 aio_onceonly();
292 break;
293 case MOD_UNLOAD:
294 error = aio_unload();
295 break;
296 case MOD_SHUTDOWN:
297 break;
298 default:
299 error = EINVAL;
300 break;
301 }
302 return (error);
303 }
304
305 static moduledata_t aio_mod = {
306 "aio",
307 &aio_modload,
308 NULL
309 };
310
311 SYSCALL_MODULE_HELPER(aio_return);
312 SYSCALL_MODULE_HELPER(aio_suspend);
313 SYSCALL_MODULE_HELPER(aio_cancel);
314 SYSCALL_MODULE_HELPER(aio_error);
315 SYSCALL_MODULE_HELPER(aio_read);
316 SYSCALL_MODULE_HELPER(aio_write);
317 SYSCALL_MODULE_HELPER(aio_waitcomplete);
318 SYSCALL_MODULE_HELPER(lio_listio);
319
320 DECLARE_MODULE(aio, aio_mod,
321 SI_SUB_VFS, SI_ORDER_ANY);
322 MODULE_VERSION(aio, 1);
323
324 /*
325 * Startup initialization
326 */
327 static void
328 aio_onceonly(void)
329 {
330
331 /* XXX: should probably just use so->callback */
332 aio_swake = &aio_swake_cb;
333 at_exit(aio_proc_rundown);
334 at_exec(aio_proc_rundown);
335 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops);
336 TAILQ_INIT(&aio_freeproc);
337 TAILQ_INIT(&aio_activeproc);
338 TAILQ_INIT(&aio_jobs);
339 TAILQ_INIT(&aio_bufjobs);
340 kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL,
341 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
342 aiop_zone = uma_zcreate("AIOP", sizeof(struct aiothreadlist), NULL,
343 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
344 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct aiocblist), NULL, NULL,
345 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
346 aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL,
347 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
348 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aio_liojob), NULL,
349 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
350 aiod_timeout = AIOD_TIMEOUT_DEFAULT;
351 aiod_lifetime = AIOD_LIFETIME_DEFAULT;
352 jobrefid = 1;
353 async_io_version = _POSIX_VERSION;
354 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX);
355 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE);
356 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0);
357 }
358
359 /*
360 * Callback for unload of AIO when used as a module.
361 */
362 static int
363 aio_unload(void)
364 {
365
366 /*
367 * XXX: no unloads by default, it's too dangerous.
368 * perhaps we could do it if locked out callers and then
369 * did an aio_proc_rundown() on each process.
370 */
371 if (!unloadable)
372 return (EOPNOTSUPP);
373
374 async_io_version = 0;
375 aio_swake = NULL;
376 rm_at_exit(aio_proc_rundown);
377 rm_at_exec(aio_proc_rundown);
378 kqueue_del_filteropts(EVFILT_AIO);
379 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, -1);
380 p31b_setcfg(CTL_P1003_1B_AIO_MAX, -1);
381 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, -1);
382 return (0);
383 }
384
385 /*
386 * Init the per-process aioinfo structure. The aioinfo limits are set
387 * per-process for user limit (resource) management.
388 */
389 static void
390 aio_init_aioinfo(struct proc *p)
391 {
392 struct kaioinfo *ki;
393 if (p->p_aioinfo == NULL) {
394 ki = uma_zalloc(kaio_zone, M_WAITOK);
395 p->p_aioinfo = ki;
396 ki->kaio_flags = 0;
397 ki->kaio_maxactive_count = max_aio_per_proc;
398 ki->kaio_active_count = 0;
399 ki->kaio_qallowed_count = max_aio_queue_per_proc;
400 ki->kaio_queue_count = 0;
401 ki->kaio_ballowed_count = max_buf_aio;
402 ki->kaio_buffer_count = 0;
403 ki->kaio_buffer_finished_count = 0;
404 ki->kaio_p = p;
405 TAILQ_INIT(&ki->kaio_jobdone);
406 TAILQ_INIT(&ki->kaio_jobqueue);
407 TAILQ_INIT(&ki->kaio_bufdone);
408 TAILQ_INIT(&ki->kaio_bufqueue);
409 TAILQ_INIT(&ki->kaio_liojoblist);
410 TAILQ_INIT(&ki->kaio_sockqueue);
411 }
412
413 while (num_aio_procs < target_aio_procs)
414 aio_newproc();
415 }
416
417 /*
418 * Free a job entry. Wait for completion if it is currently active, but don't
419 * delay forever. If we delay, we return a flag that says that we have to
420 * restart the queue scan.
421 */
422 static int
423 aio_free_entry(struct aiocblist *aiocbe)
424 {
425 struct kaioinfo *ki;
426 struct aio_liojob *lj;
427 struct proc *p;
428 int error;
429 int s;
430
431 if (aiocbe->jobstate == JOBST_NULL)
432 panic("aio_free_entry: freeing already free job");
433
434 p = aiocbe->userproc;
435 ki = p->p_aioinfo;
436 lj = aiocbe->lio;
437 if (ki == NULL)
438 panic("aio_free_entry: missing p->p_aioinfo");
439
440 while (aiocbe->jobstate == JOBST_JOBRUNNING) {
441 aiocbe->jobflags |= AIOCBLIST_RUNDOWN;
442 tsleep(aiocbe, PRIBIO, "jobwai", 0);
443 }
444 if (aiocbe->bp == NULL) {
445 if (ki->kaio_queue_count <= 0)
446 panic("aio_free_entry: process queue size <= 0");
447 if (num_queue_count <= 0)
448 panic("aio_free_entry: system wide queue size <= 0");
449
450 if (lj) {
451 lj->lioj_queue_count--;
452 if (aiocbe->jobflags & AIOCBLIST_DONE)
453 lj->lioj_queue_finished_count--;
454 }
455 ki->kaio_queue_count--;
456 if (aiocbe->jobflags & AIOCBLIST_DONE)
457 ki->kaio_queue_finished_count--;
458 num_queue_count--;
459 } else {
460 if (lj) {
461 lj->lioj_buffer_count--;
462 if (aiocbe->jobflags & AIOCBLIST_DONE)
463 lj->lioj_buffer_finished_count--;
464 }
465 if (aiocbe->jobflags & AIOCBLIST_DONE)
466 ki->kaio_buffer_finished_count--;
467 ki->kaio_buffer_count--;
468 num_buf_aio--;
469 }
470
471 /* aiocbe is going away, we need to destroy any knotes */
472 /* XXXKSE Note the thread here is used to eventually find the
473 * owning process again, but it is also used to do a fo_close
474 * and that requires the thread. (but does it require the
475 * OWNING thread? (or maybe the running thread?)
476 * There is a semantic problem here...
477 */
478 knote_remove(FIRST_THREAD_IN_PROC(p), &aiocbe->klist); /* XXXKSE */
479
480 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN)
481 && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) {
482 ki->kaio_flags &= ~KAIO_WAKEUP;
483 wakeup(p);
484 }
485
486 if (aiocbe->jobstate == JOBST_JOBQBUF) {
487 if ((error = aio_fphysio(aiocbe)) != 0)
488 return error;
489 if (aiocbe->jobstate != JOBST_JOBBFINISHED)
490 panic("aio_free_entry: invalid physio finish-up state");
491 s = splbio();
492 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist);
493 splx(s);
494 } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) {
495 s = splnet();
496 TAILQ_REMOVE(&aio_jobs, aiocbe, list);
497 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
498 splx(s);
499 } else if (aiocbe->jobstate == JOBST_JOBFINISHED)
500 TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist);
501 else if (aiocbe->jobstate == JOBST_JOBBFINISHED) {
502 s = splbio();
503 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist);
504 splx(s);
505 if (aiocbe->bp) {
506 vunmapbuf(aiocbe->bp);
507 relpbuf(aiocbe->bp, NULL);
508 aiocbe->bp = NULL;
509 }
510 }
511 if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) {
512 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
513 uma_zfree(aiolio_zone, lj);
514 }
515 aiocbe->jobstate = JOBST_NULL;
516 untimeout(process_signal, aiocbe, aiocbe->timeouthandle);
517 fdrop(aiocbe->fd_file, curthread);
518 crfree(aiocbe->cred);
519 uma_zfree(aiocb_zone, aiocbe);
520 return 0;
521 }
522
523 /*
524 * Rundown the jobs for a given process.
525 */
526 static void
527 aio_proc_rundown(struct proc *p)
528 {
529 int s;
530 struct kaioinfo *ki;
531 struct aio_liojob *lj, *ljn;
532 struct aiocblist *aiocbe, *aiocbn;
533 struct file *fp;
534 struct socket *so;
535
536 ki = p->p_aioinfo;
537 if (ki == NULL)
538 return;
539
540 ki->kaio_flags |= LIOJ_SIGNAL_POSTED;
541 while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count >
542 ki->kaio_buffer_finished_count)) {
543 ki->kaio_flags |= KAIO_RUNDOWN;
544 if (tsleep(p, PRIBIO, "kaiowt", aiod_timeout))
545 break;
546 }
547
548 /*
549 * Move any aio ops that are waiting on socket I/O to the normal job
550 * queues so they are cleaned up with any others.
551 */
552 s = splnet();
553 for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe =
554 aiocbn) {
555 aiocbn = TAILQ_NEXT(aiocbe, plist);
556 fp = aiocbe->fd_file;
557 if (fp != NULL) {
558 so = (struct socket *)fp->f_data;
559 TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list);
560 if (TAILQ_EMPTY(&so->so_aiojobq)) {
561 so->so_snd.sb_flags &= ~SB_AIO;
562 so->so_rcv.sb_flags &= ~SB_AIO;
563 }
564 }
565 TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist);
566 TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list);
567 TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist);
568 }
569 splx(s);
570
571 restart1:
572 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) {
573 aiocbn = TAILQ_NEXT(aiocbe, plist);
574 if (aio_free_entry(aiocbe))
575 goto restart1;
576 }
577
578 restart2:
579 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue); aiocbe; aiocbe =
580 aiocbn) {
581 aiocbn = TAILQ_NEXT(aiocbe, plist);
582 if (aio_free_entry(aiocbe))
583 goto restart2;
584 }
585
586 /*
587 * Note the use of lots of splbio here, trying to avoid splbio for long chains
588 * of I/O. Probably unnecessary.
589 */
590 restart3:
591 s = splbio();
592 while (TAILQ_FIRST(&ki->kaio_bufqueue)) {
593 ki->kaio_flags |= KAIO_WAKEUP;
594 tsleep(p, PRIBIO, "aioprn", 0);
595 splx(s);
596 goto restart3;
597 }
598 splx(s);
599
600 restart4:
601 s = splbio();
602 for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) {
603 aiocbn = TAILQ_NEXT(aiocbe, plist);
604 if (aio_free_entry(aiocbe)) {
605 splx(s);
606 goto restart4;
607 }
608 }
609 splx(s);
610
611 /*
612 * If we've slept, jobs might have moved from one queue to another.
613 * Retry rundown if we didn't manage to empty the queues.
614 */
615 if (TAILQ_FIRST(&ki->kaio_jobdone) != NULL ||
616 TAILQ_FIRST(&ki->kaio_jobqueue) != NULL ||
617 TAILQ_FIRST(&ki->kaio_bufqueue) != NULL ||
618 TAILQ_FIRST(&ki->kaio_bufdone) != NULL)
619 goto restart1;
620
621 for (lj = TAILQ_FIRST(&ki->kaio_liojoblist); lj; lj = ljn) {
622 ljn = TAILQ_NEXT(lj, lioj_list);
623 if ((lj->lioj_buffer_count == 0) && (lj->lioj_queue_count ==
624 0)) {
625 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
626 uma_zfree(aiolio_zone, lj);
627 } else {
628 #ifdef DIAGNOSTIC
629 printf("LIO job not cleaned up: B:%d, BF:%d, Q:%d, "
630 "QF:%d\n", lj->lioj_buffer_count,
631 lj->lioj_buffer_finished_count,
632 lj->lioj_queue_count,
633 lj->lioj_queue_finished_count);
634 #endif
635 }
636 }
637
638 uma_zfree(kaio_zone, ki);
639 p->p_aioinfo = NULL;
640 }
641
642 /*
643 * Select a job to run (called by an AIO daemon).
644 */
645 static struct aiocblist *
646 aio_selectjob(struct aiothreadlist *aiop)
647 {
648 int s;
649 struct aiocblist *aiocbe;
650 struct kaioinfo *ki;
651 struct proc *userp;
652
653 s = splnet();
654 for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe =
655 TAILQ_NEXT(aiocbe, list)) {
656 userp = aiocbe->userproc;
657 ki = userp->p_aioinfo;
658
659 if (ki->kaio_active_count < ki->kaio_maxactive_count) {
660 TAILQ_REMOVE(&aio_jobs, aiocbe, list);
661 splx(s);
662 return aiocbe;
663 }
664 }
665 splx(s);
666
667 return NULL;
668 }
669
670 /*
671 * The AIO processing activity. This is the code that does the I/O request for
672 * the non-physio version of the operations. The normal vn operations are used,
673 * and this code should work in all instances for every type of file, including
674 * pipes, sockets, fifos, and regular files.
675 */
676 static void
677 aio_process(struct aiocblist *aiocbe)
678 {
679 struct ucred *td_savedcred;
680 struct thread *td;
681 struct proc *mycp;
682 struct aiocb *cb;
683 struct file *fp;
684 struct uio auio;
685 struct iovec aiov;
686 int cnt;
687 int error;
688 int oublock_st, oublock_end;
689 int inblock_st, inblock_end;
690
691 td = curthread;
692 td_savedcred = td->td_ucred;
693 td->td_ucred = aiocbe->cred;
694 mycp = td->td_proc;
695 cb = &aiocbe->uaiocb;
696 fp = aiocbe->fd_file;
697
698 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
699 aiov.iov_len = cb->aio_nbytes;
700
701 auio.uio_iov = &aiov;
702 auio.uio_iovcnt = 1;
703 auio.uio_offset = cb->aio_offset;
704 auio.uio_resid = cb->aio_nbytes;
705 cnt = cb->aio_nbytes;
706 auio.uio_segflg = UIO_USERSPACE;
707 auio.uio_td = td;
708
709 inblock_st = mycp->p_stats->p_ru.ru_inblock;
710 oublock_st = mycp->p_stats->p_ru.ru_oublock;
711 /*
712 * _aio_aqueue() acquires a reference to the file that is
713 * released in aio_free_entry().
714 */
715 if (cb->aio_lio_opcode == LIO_READ) {
716 auio.uio_rw = UIO_READ;
717 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td);
718 } else {
719 auio.uio_rw = UIO_WRITE;
720 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td);
721 }
722 inblock_end = mycp->p_stats->p_ru.ru_inblock;
723 oublock_end = mycp->p_stats->p_ru.ru_oublock;
724
725 aiocbe->inputcharge = inblock_end - inblock_st;
726 aiocbe->outputcharge = oublock_end - oublock_st;
727
728 if ((error) && (auio.uio_resid != cnt)) {
729 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
730 error = 0;
731 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) {
732 PROC_LOCK(aiocbe->userproc);
733 psignal(aiocbe->userproc, SIGPIPE);
734 PROC_UNLOCK(aiocbe->userproc);
735 }
736 }
737
738 cnt -= auio.uio_resid;
739 cb->_aiocb_private.error = error;
740 cb->_aiocb_private.status = cnt;
741 td->td_ucred = td_savedcred;
742 }
743
744 /*
745 * The AIO daemon, most of the actual work is done in aio_process,
746 * but the setup (and address space mgmt) is done in this routine.
747 */
748 static void
749 aio_daemon(void *uproc)
750 {
751 int s;
752 struct aio_liojob *lj;
753 struct aiocb *cb;
754 struct aiocblist *aiocbe;
755 struct aiothreadlist *aiop;
756 struct kaioinfo *ki;
757 struct proc *curcp, *mycp, *userp;
758 struct vmspace *myvm, *tmpvm;
759 struct thread *td = curthread;
760 struct pgrp *newpgrp;
761 struct session *newsess;
762
763 mtx_lock(&Giant);
764 /*
765 * Local copies of curproc (cp) and vmspace (myvm)
766 */
767 mycp = td->td_proc;
768 myvm = mycp->p_vmspace;
769
770 if (mycp->p_textvp) {
771 vrele(mycp->p_textvp);
772 mycp->p_textvp = NULL;
773 }
774
775 /*
776 * Allocate and ready the aio control info. There is one aiop structure
777 * per daemon.
778 */
779 aiop = uma_zalloc(aiop_zone, M_WAITOK);
780 aiop->aiothread = td;
781 aiop->aiothreadflags |= AIOP_FREE;
782
783 s = splnet();
784
785 /*
786 * Place thread (lightweight process) onto the AIO free thread list.
787 */
788 if (TAILQ_EMPTY(&aio_freeproc))
789 wakeup(&aio_freeproc);
790 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
791
792 splx(s);
793
794 /*
795 * Get rid of our current filedescriptors. AIOD's don't need any
796 * filedescriptors, except as temporarily inherited from the client.
797 */
798 fdfree(td);
799
800 mtx_unlock(&Giant);
801 /* The daemon resides in its own pgrp. */
802 MALLOC(newpgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
803 M_WAITOK | M_ZERO);
804 MALLOC(newsess, struct session *, sizeof(struct session), M_SESSION,
805 M_WAITOK | M_ZERO);
806
807 sx_xlock(&proctree_lock);
808 enterpgrp(mycp, mycp->p_pid, newpgrp, newsess);
809 sx_xunlock(&proctree_lock);
810 mtx_lock(&Giant);
811
812 /* Mark special process type. */
813 mycp->p_flag |= P_SYSTEM;
814
815 /*
816 * Wakeup parent process. (Parent sleeps to keep from blasting away
817 * and creating too many daemons.)
818 */
819 wakeup(mycp);
820
821 for (;;) {
822 /*
823 * curcp is the current daemon process context.
824 * userp is the current user process context.
825 */
826 curcp = mycp;
827
828 /*
829 * Take daemon off of free queue
830 */
831 if (aiop->aiothreadflags & AIOP_FREE) {
832 s = splnet();
833 TAILQ_REMOVE(&aio_freeproc, aiop, list);
834 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
835 aiop->aiothreadflags &= ~AIOP_FREE;
836 splx(s);
837 }
838 aiop->aiothreadflags &= ~AIOP_SCHED;
839
840 /*
841 * Check for jobs.
842 */
843 while ((aiocbe = aio_selectjob(aiop)) != NULL) {
844 cb = &aiocbe->uaiocb;
845 userp = aiocbe->userproc;
846
847 aiocbe->jobstate = JOBST_JOBRUNNING;
848
849 /*
850 * Connect to process address space for user program.
851 */
852 if (userp != curcp) {
853 /*
854 * Save the current address space that we are
855 * connected to.
856 */
857 tmpvm = mycp->p_vmspace;
858
859 /*
860 * Point to the new user address space, and
861 * refer to it.
862 */
863 mycp->p_vmspace = userp->p_vmspace;
864 mycp->p_vmspace->vm_refcnt++;
865
866 /* Activate the new mapping. */
867 pmap_activate(FIRST_THREAD_IN_PROC(mycp));
868
869 /*
870 * If the old address space wasn't the daemons
871 * own address space, then we need to remove the
872 * daemon's reference from the other process
873 * that it was acting on behalf of.
874 */
875 if (tmpvm != myvm) {
876 vmspace_free(tmpvm);
877 }
878 curcp = userp;
879 }
880
881 ki = userp->p_aioinfo;
882 lj = aiocbe->lio;
883
884 /* Account for currently active jobs. */
885 ki->kaio_active_count++;
886
887 /* Do the I/O function. */
888 aio_process(aiocbe);
889
890 /* Decrement the active job count. */
891 ki->kaio_active_count--;
892
893 /*
894 * Increment the completion count for wakeup/signal
895 * comparisons.
896 */
897 aiocbe->jobflags |= AIOCBLIST_DONE;
898 ki->kaio_queue_finished_count++;
899 if (lj)
900 lj->lioj_queue_finished_count++;
901 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags
902 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) {
903 ki->kaio_flags &= ~KAIO_WAKEUP;
904 wakeup(userp);
905 }
906
907 s = splbio();
908 if (lj && (lj->lioj_flags &
909 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) {
910 if ((lj->lioj_queue_finished_count ==
911 lj->lioj_queue_count) &&
912 (lj->lioj_buffer_finished_count ==
913 lj->lioj_buffer_count)) {
914 PROC_LOCK(userp);
915 psignal(userp,
916 lj->lioj_signal.sigev_signo);
917 PROC_UNLOCK(userp);
918 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
919 }
920 }
921 splx(s);
922
923 aiocbe->jobstate = JOBST_JOBFINISHED;
924
925 s = splnet();
926 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
927 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist);
928 splx(s);
929 KNOTE(&aiocbe->klist, 0);
930
931 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) {
932 wakeup(aiocbe);
933 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
934 }
935
936 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
937 PROC_LOCK(userp);
938 psignal(userp, cb->aio_sigevent.sigev_signo);
939 PROC_UNLOCK(userp);
940 }
941 }
942
943 /*
944 * Disconnect from user address space.
945 */
946 if (curcp != mycp) {
947 /* Get the user address space to disconnect from. */
948 tmpvm = mycp->p_vmspace;
949
950 /* Get original address space for daemon. */
951 mycp->p_vmspace = myvm;
952
953 /* Activate the daemon's address space. */
954 pmap_activate(FIRST_THREAD_IN_PROC(mycp));
955 #ifdef DIAGNOSTIC
956 if (tmpvm == myvm) {
957 printf("AIOD: vmspace problem -- %d\n",
958 mycp->p_pid);
959 }
960 #endif
961 /* Remove our vmspace reference. */
962 vmspace_free(tmpvm);
963
964 curcp = mycp;
965 }
966
967 /*
968 * If we are the first to be put onto the free queue, wakeup
969 * anyone waiting for a daemon.
970 */
971 s = splnet();
972 TAILQ_REMOVE(&aio_activeproc, aiop, list);
973 if (TAILQ_EMPTY(&aio_freeproc))
974 wakeup(&aio_freeproc);
975 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
976 aiop->aiothreadflags |= AIOP_FREE;
977 splx(s);
978
979 /*
980 * If daemon is inactive for a long time, allow it to exit,
981 * thereby freeing resources.
982 */
983 if ((aiop->aiothreadflags & AIOP_SCHED) == 0 &&
984 tsleep(aiop->aiothread, PRIBIO, "aiordy", aiod_lifetime)) {
985 s = splnet();
986 if (TAILQ_EMPTY(&aio_jobs)) {
987 if ((aiop->aiothreadflags & AIOP_FREE) &&
988 (num_aio_procs > target_aio_procs)) {
989 TAILQ_REMOVE(&aio_freeproc, aiop, list);
990 splx(s);
991 uma_zfree(aiop_zone, aiop);
992 num_aio_procs--;
993 #ifdef DIAGNOSTIC
994 if (mycp->p_vmspace->vm_refcnt <= 1) {
995 printf("AIOD: bad vm refcnt for"
996 " exiting daemon: %d\n",
997 mycp->p_vmspace->vm_refcnt);
998 }
999 #endif
1000 kthread_exit(0);
1001 }
1002 }
1003 splx(s);
1004 }
1005 }
1006 }
1007
1008 /*
1009 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
1010 * AIO daemon modifies its environment itself.
1011 */
1012 static int
1013 aio_newproc()
1014 {
1015 int error;
1016 struct proc *p;
1017
1018 error = kthread_create(aio_daemon, curproc, &p, RFNOWAIT, 0, "aiod%d",
1019 num_aio_procs);
1020 if (error)
1021 return error;
1022
1023 /*
1024 * Wait until daemon is started, but continue on just in case to
1025 * handle error conditions.
1026 */
1027 error = tsleep(p, PZERO, "aiosta", aiod_timeout);
1028
1029 num_aio_procs++;
1030
1031 return error;
1032 }
1033
1034 /*
1035 * Try the high-performance, low-overhead physio method for eligible
1036 * VCHR devices. This method doesn't use an aio helper thread, and
1037 * thus has very low overhead.
1038 *
1039 * Assumes that the caller, _aio_aqueue(), has incremented the file
1040 * structure's reference count, preventing its deallocation for the
1041 * duration of this call.
1042 */
1043 static int
1044 aio_qphysio(struct proc *p, struct aiocblist *aiocbe)
1045 {
1046 int error;
1047 struct aiocb *cb;
1048 struct file *fp;
1049 struct buf *bp;
1050 struct vnode *vp;
1051 struct kaioinfo *ki;
1052 struct aio_liojob *lj;
1053 int s;
1054 int notify;
1055
1056 cb = &aiocbe->uaiocb;
1057 fp = aiocbe->fd_file;
1058
1059 if (fp->f_type != DTYPE_VNODE)
1060 return (-1);
1061
1062 vp = (struct vnode *)fp->f_data;
1063
1064 /*
1065 * If its not a disk, we don't want to return a positive error.
1066 * It causes the aio code to not fall through to try the thread
1067 * way when you're talking to a regular file.
1068 */
1069 if (!vn_isdisk(vp, &error)) {
1070 if (error == ENOTBLK)
1071 return (-1);
1072 else
1073 return (error);
1074 }
1075
1076 if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys)
1077 return (-1);
1078
1079 if (cb->aio_nbytes >
1080 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK))
1081 return (-1);
1082
1083 ki = p->p_aioinfo;
1084 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count)
1085 return (-1);
1086
1087 ki->kaio_buffer_count++;
1088
1089 lj = aiocbe->lio;
1090 if (lj)
1091 lj->lioj_buffer_count++;
1092
1093 /* Create and build a buffer header for a transfer. */
1094 bp = (struct buf *)getpbuf(NULL);
1095 BUF_KERNPROC(bp);
1096
1097 /*
1098 * Get a copy of the kva from the physical buffer.
1099 */
1100 bp->b_caller1 = p;
1101 bp->b_dev = vp->v_rdev;
1102 error = bp->b_error = 0;
1103
1104 bp->b_bcount = cb->aio_nbytes;
1105 bp->b_bufsize = cb->aio_nbytes;
1106 bp->b_flags = B_PHYS;
1107 bp->b_iodone = aio_physwakeup;
1108 bp->b_saveaddr = bp->b_data;
1109 bp->b_data = (void *)(uintptr_t)cb->aio_buf;
1110 bp->b_blkno = btodb(cb->aio_offset);
1111
1112 if (cb->aio_lio_opcode == LIO_WRITE) {
1113 bp->b_iocmd = BIO_WRITE;
1114 if (!useracc(bp->b_data, bp->b_bufsize, VM_PROT_READ)) {
1115 error = EFAULT;
1116 goto doerror;
1117 }
1118 } else {
1119 bp->b_iocmd = BIO_READ;
1120 if (!useracc(bp->b_data, bp->b_bufsize, VM_PROT_WRITE)) {
1121 error = EFAULT;
1122 goto doerror;
1123 }
1124 }
1125
1126 /* Bring buffer into kernel space. */
1127 vmapbuf(bp);
1128
1129 s = splbio();
1130 aiocbe->bp = bp;
1131 bp->b_spc = (void *)aiocbe;
1132 TAILQ_INSERT_TAIL(&aio_bufjobs, aiocbe, list);
1133 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist);
1134 aiocbe->jobstate = JOBST_JOBQBUF;
1135 cb->_aiocb_private.status = cb->aio_nbytes;
1136 num_buf_aio++;
1137 bp->b_error = 0;
1138
1139 splx(s);
1140
1141 /* Perform transfer. */
1142 DEV_STRATEGY(bp, 0);
1143
1144 notify = 0;
1145 s = splbio();
1146
1147 /*
1148 * If we had an error invoking the request, or an error in processing
1149 * the request before we have returned, we process it as an error in
1150 * transfer. Note that such an I/O error is not indicated immediately,
1151 * but is returned using the aio_error mechanism. In this case,
1152 * aio_suspend will return immediately.
1153 */
1154 if (bp->b_error || (bp->b_ioflags & BIO_ERROR)) {
1155 struct aiocb *job = aiocbe->uuaiocb;
1156
1157 aiocbe->uaiocb._aiocb_private.status = 0;
1158 suword(&job->_aiocb_private.status, 0);
1159 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
1160 suword(&job->_aiocb_private.error, bp->b_error);
1161
1162 ki->kaio_buffer_finished_count++;
1163
1164 if (aiocbe->jobstate != JOBST_JOBBFINISHED) {
1165 aiocbe->jobstate = JOBST_JOBBFINISHED;
1166 aiocbe->jobflags |= AIOCBLIST_DONE;
1167 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list);
1168 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist);
1169 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist);
1170 notify = 1;
1171 }
1172 }
1173 splx(s);
1174 if (notify)
1175 KNOTE(&aiocbe->klist, 0);
1176 return 0;
1177
1178 doerror:
1179 ki->kaio_buffer_count--;
1180 if (lj)
1181 lj->lioj_buffer_count--;
1182 aiocbe->bp = NULL;
1183 relpbuf(bp, NULL);
1184 return error;
1185 }
1186
1187 /*
1188 * This waits/tests physio completion.
1189 */
1190 static int
1191 aio_fphysio(struct aiocblist *iocb)
1192 {
1193 int s;
1194 struct buf *bp;
1195 int error;
1196
1197 bp = iocb->bp;
1198
1199 s = splbio();
1200 while ((bp->b_flags & B_DONE) == 0) {
1201 if (tsleep(bp, PRIBIO, "physstr", aiod_timeout)) {
1202 if ((bp->b_flags & B_DONE) == 0) {
1203 splx(s);
1204 return EINPROGRESS;
1205 } else
1206 break;
1207 }
1208 }
1209 splx(s);
1210
1211 /* Release mapping into kernel space. */
1212 vunmapbuf(bp);
1213 iocb->bp = 0;
1214
1215 error = 0;
1216
1217 /* Check for an error. */
1218 if (bp->b_ioflags & BIO_ERROR)
1219 error = bp->b_error;
1220
1221 relpbuf(bp, NULL);
1222 return (error);
1223 }
1224
1225 /*
1226 * Wake up aio requests that may be serviceable now.
1227 */
1228 static void
1229 aio_swake_cb(struct socket *so, struct sockbuf *sb)
1230 {
1231 struct aiocblist *cb,*cbn;
1232 struct proc *p;
1233 struct kaioinfo *ki = NULL;
1234 int opcode, wakecount = 0;
1235 struct aiothreadlist *aiop;
1236
1237 if (sb == &so->so_snd) {
1238 opcode = LIO_WRITE;
1239 so->so_snd.sb_flags &= ~SB_AIO;
1240 } else {
1241 opcode = LIO_READ;
1242 so->so_rcv.sb_flags &= ~SB_AIO;
1243 }
1244
1245 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) {
1246 cbn = TAILQ_NEXT(cb, list);
1247 if (opcode == cb->uaiocb.aio_lio_opcode) {
1248 p = cb->userproc;
1249 ki = p->p_aioinfo;
1250 TAILQ_REMOVE(&so->so_aiojobq, cb, list);
1251 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist);
1252 TAILQ_INSERT_TAIL(&aio_jobs, cb, list);
1253 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist);
1254 wakecount++;
1255 if (cb->jobstate != JOBST_JOBQGLOBAL)
1256 panic("invalid queue value");
1257 }
1258 }
1259
1260 while (wakecount--) {
1261 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) {
1262 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1263 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
1264 aiop->aiothreadflags &= ~AIOP_FREE;
1265 wakeup(aiop->aiothread);
1266 }
1267 }
1268 }
1269
1270 /*
1271 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR
1272 * technique is done in this code.
1273 */
1274 static int
1275 _aio_aqueue(struct thread *td, struct aiocb *job, struct aio_liojob *lj, int type)
1276 {
1277 struct proc *p = td->td_proc;
1278 struct filedesc *fdp;
1279 struct file *fp;
1280 unsigned int fd;
1281 struct socket *so;
1282 int s;
1283 int error;
1284 int opcode, user_opcode;
1285 struct aiocblist *aiocbe;
1286 struct aiothreadlist *aiop;
1287 struct kaioinfo *ki;
1288 struct kevent kev;
1289 struct kqueue *kq;
1290 struct file *kq_fp;
1291
1292 aiocbe = uma_zalloc(aiocb_zone, M_WAITOK);
1293 aiocbe->inputcharge = 0;
1294 aiocbe->outputcharge = 0;
1295 callout_handle_init(&aiocbe->timeouthandle);
1296 SLIST_INIT(&aiocbe->klist);
1297
1298 suword(&job->_aiocb_private.status, -1);
1299 suword(&job->_aiocb_private.error, 0);
1300 suword(&job->_aiocb_private.kernelinfo, -1);
1301
1302 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb));
1303 if (error) {
1304 suword(&job->_aiocb_private.error, error);
1305 uma_zfree(aiocb_zone, aiocbe);
1306 return error;
1307 }
1308 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL &&
1309 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) {
1310 uma_zfree(aiocb_zone, aiocbe);
1311 return EINVAL;
1312 }
1313
1314 /* Save userspace address of the job info. */
1315 aiocbe->uuaiocb = job;
1316
1317 /* Get the opcode. */
1318 user_opcode = aiocbe->uaiocb.aio_lio_opcode;
1319 if (type != LIO_NOP)
1320 aiocbe->uaiocb.aio_lio_opcode = type;
1321 opcode = aiocbe->uaiocb.aio_lio_opcode;
1322
1323 /* Get the fd info for process. */
1324 fdp = p->p_fd;
1325
1326 /*
1327 * Range check file descriptor.
1328 */
1329 fd = aiocbe->uaiocb.aio_fildes;
1330 if (fd >= fdp->fd_nfiles) {
1331 uma_zfree(aiocb_zone, aiocbe);
1332 if (type == 0)
1333 suword(&job->_aiocb_private.error, EBADF);
1334 return EBADF;
1335 }
1336
1337 fp = aiocbe->fd_file = fdp->fd_ofiles[fd];
1338 if ((fp == NULL) || ((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) ==
1339 0))) {
1340 uma_zfree(aiocb_zone, aiocbe);
1341 if (type == 0)
1342 suword(&job->_aiocb_private.error, EBADF);
1343 return EBADF;
1344 }
1345 fhold(fp);
1346
1347 if (aiocbe->uaiocb.aio_offset == -1LL) {
1348 error = EINVAL;
1349 goto aqueue_fail;
1350 }
1351 error = suword(&job->_aiocb_private.kernelinfo, jobrefid);
1352 if (error) {
1353 error = EINVAL;
1354 goto aqueue_fail;
1355 }
1356 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid;
1357 if (jobrefid == LONG_MAX)
1358 jobrefid = 1;
1359 else
1360 jobrefid++;
1361
1362 if (opcode == LIO_NOP) {
1363 fdrop(fp, td);
1364 uma_zfree(aiocb_zone, aiocbe);
1365 if (type == 0) {
1366 suword(&job->_aiocb_private.error, 0);
1367 suword(&job->_aiocb_private.status, 0);
1368 suword(&job->_aiocb_private.kernelinfo, 0);
1369 }
1370 return 0;
1371 }
1372 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) {
1373 if (type == 0)
1374 suword(&job->_aiocb_private.status, 0);
1375 error = EINVAL;
1376 goto aqueue_fail;
1377 }
1378
1379 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) {
1380 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue;
1381 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sigval_ptr;
1382 }
1383 else {
1384 /*
1385 * This method for requesting kevent-based notification won't
1386 * work on the alpha, since we're passing in a pointer
1387 * via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT-
1388 * based method instead.
1389 */
1390 if (user_opcode == LIO_NOP || user_opcode == LIO_READ ||
1391 user_opcode == LIO_WRITE)
1392 goto no_kqueue;
1393
1394 error = copyin((struct kevent *)(uintptr_t)user_opcode,
1395 &kev, sizeof(kev));
1396 if (error)
1397 goto aqueue_fail;
1398 }
1399 if ((u_int)kev.ident >= fdp->fd_nfiles ||
1400 (kq_fp = fdp->fd_ofiles[kev.ident]) == NULL ||
1401 (kq_fp->f_type != DTYPE_KQUEUE)) {
1402 error = EBADF;
1403 goto aqueue_fail;
1404 }
1405 kq = (struct kqueue *)kq_fp->f_data;
1406 kev.ident = (uintptr_t)aiocbe->uuaiocb;
1407 kev.filter = EVFILT_AIO;
1408 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
1409 kev.data = (intptr_t)aiocbe;
1410 error = kqueue_register(kq, &kev, td);
1411 aqueue_fail:
1412 if (error) {
1413 fdrop(fp, td);
1414 uma_zfree(aiocb_zone, aiocbe);
1415 if (type == 0)
1416 suword(&job->_aiocb_private.error, error);
1417 goto done;
1418 }
1419 no_kqueue:
1420
1421 suword(&job->_aiocb_private.error, EINPROGRESS);
1422 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS;
1423 aiocbe->userproc = p;
1424 aiocbe->cred = crhold(td->td_ucred);
1425 aiocbe->jobflags = 0;
1426 aiocbe->lio = lj;
1427 ki = p->p_aioinfo;
1428
1429 if (fp->f_type == DTYPE_SOCKET) {
1430 /*
1431 * Alternate queueing for socket ops: Reach down into the
1432 * descriptor to get the socket data. Then check to see if the
1433 * socket is ready to be read or written (based on the requested
1434 * operation).
1435 *
1436 * If it is not ready for io, then queue the aiocbe on the
1437 * socket, and set the flags so we get a call when sbnotify()
1438 * happens.
1439 */
1440 so = (struct socket *)fp->f_data;
1441 s = splnet();
1442 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode ==
1443 LIO_WRITE) && (!sowriteable(so)))) {
1444 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list);
1445 TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist);
1446 if (opcode == LIO_READ)
1447 so->so_rcv.sb_flags |= SB_AIO;
1448 else
1449 so->so_snd.sb_flags |= SB_AIO;
1450 aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */
1451 ki->kaio_queue_count++;
1452 num_queue_count++;
1453 splx(s);
1454 error = 0;
1455 goto done;
1456 }
1457 splx(s);
1458 }
1459
1460 if ((error = aio_qphysio(p, aiocbe)) == 0)
1461 goto done;
1462 if (error > 0) {
1463 suword(&job->_aiocb_private.status, 0);
1464 aiocbe->uaiocb._aiocb_private.error = error;
1465 suword(&job->_aiocb_private.error, error);
1466 goto done;
1467 }
1468
1469 /* No buffer for daemon I/O. */
1470 aiocbe->bp = NULL;
1471
1472 ki->kaio_queue_count++;
1473 if (lj)
1474 lj->lioj_queue_count++;
1475 s = splnet();
1476 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
1477 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
1478 splx(s);
1479 aiocbe->jobstate = JOBST_JOBQGLOBAL;
1480
1481 num_queue_count++;
1482 error = 0;
1483
1484 /*
1485 * If we don't have a free AIO process, and we are below our quota, then
1486 * start one. Otherwise, depend on the subsequent I/O completions to
1487 * pick-up this job. If we don't sucessfully create the new process
1488 * (thread) due to resource issues, we return an error for now (EAGAIN),
1489 * which is likely not the correct thing to do.
1490 */
1491 s = splnet();
1492 retryproc:
1493 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1494 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1495 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
1496 aiop->aiothreadflags &= ~AIOP_FREE;
1497 wakeup(aiop->aiothread);
1498 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
1499 ((ki->kaio_active_count + num_aio_resv_start) <
1500 ki->kaio_maxactive_count)) {
1501 num_aio_resv_start++;
1502 if ((error = aio_newproc()) == 0) {
1503 num_aio_resv_start--;
1504 goto retryproc;
1505 }
1506 num_aio_resv_start--;
1507 }
1508 splx(s);
1509 done:
1510 return error;
1511 }
1512
1513 /*
1514 * This routine queues an AIO request, checking for quotas.
1515 */
1516 static int
1517 aio_aqueue(struct thread *td, struct aiocb *job, int type)
1518 {
1519 struct proc *p = td->td_proc;
1520 struct kaioinfo *ki;
1521
1522 if (p->p_aioinfo == NULL)
1523 aio_init_aioinfo(p);
1524
1525 if (num_queue_count >= max_queue_count)
1526 return EAGAIN;
1527
1528 ki = p->p_aioinfo;
1529 if (ki->kaio_queue_count >= ki->kaio_qallowed_count)
1530 return EAGAIN;
1531
1532 return _aio_aqueue(td, job, NULL, type);
1533 }
1534
1535 /*
1536 * Support the aio_return system call, as a side-effect, kernel resources are
1537 * released.
1538 */
1539 int
1540 aio_return(struct thread *td, struct aio_return_args *uap)
1541 {
1542 struct proc *p = td->td_proc;
1543 int s;
1544 long jobref;
1545 struct aiocblist *cb, *ncb;
1546 struct aiocb *ujob;
1547 struct kaioinfo *ki;
1548
1549 ujob = uap->aiocbp;
1550 jobref = fuword(&ujob->_aiocb_private.kernelinfo);
1551 if (jobref == -1 || jobref == 0)
1552 return EINVAL;
1553
1554 ki = p->p_aioinfo;
1555 if (ki == NULL)
1556 return EINVAL;
1557 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1558 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) ==
1559 jobref) {
1560 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
1561 p->p_stats->p_ru.ru_oublock +=
1562 cb->outputcharge;
1563 cb->outputcharge = 0;
1564 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
1565 p->p_stats->p_ru.ru_inblock += cb->inputcharge;
1566 cb->inputcharge = 0;
1567 }
1568 goto done;
1569 }
1570 }
1571 s = splbio();
1572 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) {
1573 ncb = TAILQ_NEXT(cb, plist);
1574 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo)
1575 == jobref) {
1576 break;
1577 }
1578 }
1579 splx(s);
1580 done:
1581 if (cb != NULL) {
1582 if (ujob == cb->uuaiocb) {
1583 td->td_retval[0] =
1584 cb->uaiocb._aiocb_private.status;
1585 } else
1586 td->td_retval[0] = EFAULT;
1587 aio_free_entry(cb);
1588 return (0);
1589 }
1590 return (EINVAL);
1591 }
1592
1593 /*
1594 * Allow a process to wakeup when any of the I/O requests are completed.
1595 */
1596 int
1597 aio_suspend(struct thread *td, struct aio_suspend_args *uap)
1598 {
1599 struct proc *p = td->td_proc;
1600 struct timeval atv;
1601 struct timespec ts;
1602 struct aiocb *const *cbptr, *cbp;
1603 struct kaioinfo *ki;
1604 struct aiocblist *cb;
1605 int i;
1606 int njoblist;
1607 int error, s, timo;
1608 long *ijoblist;
1609 struct aiocb **ujoblist;
1610
1611 if (uap->nent > AIO_LISTIO_MAX)
1612 return EINVAL;
1613
1614 timo = 0;
1615 if (uap->timeout) {
1616 /* Get timespec struct. */
1617 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
1618 return error;
1619
1620 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
1621 return (EINVAL);
1622
1623 TIMESPEC_TO_TIMEVAL(&atv, &ts);
1624 if (itimerfix(&atv))
1625 return (EINVAL);
1626 timo = tvtohz(&atv);
1627 }
1628
1629 ki = p->p_aioinfo;
1630 if (ki == NULL)
1631 return EAGAIN;
1632
1633 njoblist = 0;
1634 ijoblist = uma_zalloc(aiol_zone, M_WAITOK);
1635 ujoblist = uma_zalloc(aiol_zone, M_WAITOK);
1636 cbptr = uap->aiocbp;
1637
1638 for (i = 0; i < uap->nent; i++) {
1639 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
1640 if (cbp == 0)
1641 continue;
1642 ujoblist[njoblist] = cbp;
1643 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo);
1644 njoblist++;
1645 }
1646
1647 if (njoblist == 0) {
1648 uma_zfree(aiol_zone, ijoblist);
1649 uma_zfree(aiol_zone, ujoblist);
1650 return 0;
1651 }
1652
1653 error = 0;
1654 for (;;) {
1655 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1656 for (i = 0; i < njoblist; i++) {
1657 if (((intptr_t)
1658 cb->uaiocb._aiocb_private.kernelinfo) ==
1659 ijoblist[i]) {
1660 if (ujoblist[i] != cb->uuaiocb)
1661 error = EINVAL;
1662 uma_zfree(aiol_zone, ijoblist);
1663 uma_zfree(aiol_zone, ujoblist);
1664 return error;
1665 }
1666 }
1667 }
1668
1669 s = splbio();
1670 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb =
1671 TAILQ_NEXT(cb, plist)) {
1672 for (i = 0; i < njoblist; i++) {
1673 if (((intptr_t)
1674 cb->uaiocb._aiocb_private.kernelinfo) ==
1675 ijoblist[i]) {
1676 splx(s);
1677 if (ujoblist[i] != cb->uuaiocb)
1678 error = EINVAL;
1679 uma_zfree(aiol_zone, ijoblist);
1680 uma_zfree(aiol_zone, ujoblist);
1681 return error;
1682 }
1683 }
1684 }
1685
1686 ki->kaio_flags |= KAIO_WAKEUP;
1687 error = tsleep(p, PRIBIO | PCATCH, "aiospn", timo);
1688 splx(s);
1689
1690 if (error == ERESTART || error == EINTR) {
1691 uma_zfree(aiol_zone, ijoblist);
1692 uma_zfree(aiol_zone, ujoblist);
1693 return EINTR;
1694 } else if (error == EWOULDBLOCK) {
1695 uma_zfree(aiol_zone, ijoblist);
1696 uma_zfree(aiol_zone, ujoblist);
1697 return EAGAIN;
1698 }
1699 }
1700
1701 /* NOTREACHED */
1702 return EINVAL;
1703 }
1704
1705 /*
1706 * aio_cancel cancels any non-physio aio operations not currently in
1707 * progress.
1708 */
1709 int
1710 aio_cancel(struct thread *td, struct aio_cancel_args *uap)
1711 {
1712 struct proc *p = td->td_proc;
1713 struct kaioinfo *ki;
1714 struct aiocblist *cbe, *cbn;
1715 struct file *fp;
1716 struct filedesc *fdp;
1717 struct socket *so;
1718 struct proc *po;
1719 int s,error;
1720 int cancelled=0;
1721 int notcancelled=0;
1722 struct vnode *vp;
1723
1724 fdp = p->p_fd;
1725 if ((u_int)uap->fd >= fdp->fd_nfiles ||
1726 (fp = fdp->fd_ofiles[uap->fd]) == NULL)
1727 return (EBADF);
1728
1729 if (fp->f_type == DTYPE_VNODE) {
1730 vp = (struct vnode *)fp->f_data;
1731
1732 if (vn_isdisk(vp,&error)) {
1733 td->td_retval[0] = AIO_NOTCANCELED;
1734 return 0;
1735 }
1736 } else if (fp->f_type == DTYPE_SOCKET) {
1737 so = (struct socket *)fp->f_data;
1738
1739 s = splnet();
1740
1741 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) {
1742 cbn = TAILQ_NEXT(cbe, list);
1743 if ((uap->aiocbp == NULL) ||
1744 (uap->aiocbp == cbe->uuaiocb) ) {
1745 po = cbe->userproc;
1746 ki = po->p_aioinfo;
1747 TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
1748 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist);
1749 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist);
1750 if (ki->kaio_flags & KAIO_WAKEUP) {
1751 wakeup(po);
1752 }
1753 cbe->jobstate = JOBST_JOBFINISHED;
1754 cbe->uaiocb._aiocb_private.status=-1;
1755 cbe->uaiocb._aiocb_private.error=ECANCELED;
1756 cancelled++;
1757 /* XXX cancelled, knote? */
1758 if (cbe->uaiocb.aio_sigevent.sigev_notify ==
1759 SIGEV_SIGNAL) {
1760 PROC_LOCK(cbe->userproc);
1761 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
1762 PROC_UNLOCK(cbe->userproc);
1763 }
1764 if (uap->aiocbp)
1765 break;
1766 }
1767 }
1768 splx(s);
1769
1770 if ((cancelled) && (uap->aiocbp)) {
1771 td->td_retval[0] = AIO_CANCELED;
1772 return 0;
1773 }
1774 }
1775 ki=p->p_aioinfo;
1776 if (ki == NULL)
1777 goto done;
1778 s = splnet();
1779
1780 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) {
1781 cbn = TAILQ_NEXT(cbe, plist);
1782
1783 if ((uap->fd == cbe->uaiocb.aio_fildes) &&
1784 ((uap->aiocbp == NULL ) ||
1785 (uap->aiocbp == cbe->uuaiocb))) {
1786
1787 if (cbe->jobstate == JOBST_JOBQGLOBAL) {
1788 TAILQ_REMOVE(&aio_jobs, cbe, list);
1789 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
1790 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe,
1791 plist);
1792 cancelled++;
1793 ki->kaio_queue_finished_count++;
1794 cbe->jobstate = JOBST_JOBFINISHED;
1795 cbe->uaiocb._aiocb_private.status = -1;
1796 cbe->uaiocb._aiocb_private.error = ECANCELED;
1797 /* XXX cancelled, knote? */
1798 if (cbe->uaiocb.aio_sigevent.sigev_notify ==
1799 SIGEV_SIGNAL) {
1800 PROC_LOCK(cbe->userproc);
1801 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
1802 PROC_UNLOCK(cbe->userproc);
1803 }
1804 } else {
1805 notcancelled++;
1806 }
1807 }
1808 }
1809 splx(s);
1810 done:
1811 if (notcancelled) {
1812 td->td_retval[0] = AIO_NOTCANCELED;
1813 return 0;
1814 }
1815 if (cancelled) {
1816 td->td_retval[0] = AIO_CANCELED;
1817 return 0;
1818 }
1819 td->td_retval[0] = AIO_ALLDONE;
1820
1821 return 0;
1822 }
1823
1824 /*
1825 * aio_error is implemented in the kernel level for compatibility purposes only.
1826 * For a user mode async implementation, it would be best to do it in a userland
1827 * subroutine.
1828 */
1829 int
1830 aio_error(struct thread *td, struct aio_error_args *uap)
1831 {
1832 struct proc *p = td->td_proc;
1833 int s;
1834 struct aiocblist *cb;
1835 struct kaioinfo *ki;
1836 long jobref;
1837
1838 ki = p->p_aioinfo;
1839 if (ki == NULL)
1840 return EINVAL;
1841
1842 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo);
1843 if ((jobref == -1) || (jobref == 0))
1844 return EINVAL;
1845
1846 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1847 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1848 jobref) {
1849 td->td_retval[0] = cb->uaiocb._aiocb_private.error;
1850 return 0;
1851 }
1852 }
1853
1854 s = splnet();
1855
1856 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb,
1857 plist)) {
1858 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1859 jobref) {
1860 td->td_retval[0] = EINPROGRESS;
1861 splx(s);
1862 return 0;
1863 }
1864 }
1865
1866 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb,
1867 plist)) {
1868 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1869 jobref) {
1870 td->td_retval[0] = EINPROGRESS;
1871 splx(s);
1872 return 0;
1873 }
1874 }
1875 splx(s);
1876
1877 s = splbio();
1878 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb,
1879 plist)) {
1880 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1881 jobref) {
1882 td->td_retval[0] = cb->uaiocb._aiocb_private.error;
1883 splx(s);
1884 return 0;
1885 }
1886 }
1887
1888 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb,
1889 plist)) {
1890 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1891 jobref) {
1892 td->td_retval[0] = EINPROGRESS;
1893 splx(s);
1894 return 0;
1895 }
1896 }
1897 splx(s);
1898
1899 #if (0)
1900 /*
1901 * Hack for lio.
1902 */
1903 status = fuword(&uap->aiocbp->_aiocb_private.status);
1904 if (status == -1)
1905 return fuword(&uap->aiocbp->_aiocb_private.error);
1906 #endif
1907 return EINVAL;
1908 }
1909
1910 /* syscall - asynchronous read from a file (REALTIME) */
1911 int
1912 aio_read(struct thread *td, struct aio_read_args *uap)
1913 {
1914
1915 return aio_aqueue(td, uap->aiocbp, LIO_READ);
1916 }
1917
1918 /* syscall - asynchronous write to a file (REALTIME) */
1919 int
1920 aio_write(struct thread *td, struct aio_write_args *uap)
1921 {
1922
1923 return aio_aqueue(td, uap->aiocbp, LIO_WRITE);
1924 }
1925
1926 /* syscall - XXX undocumented */
1927 int
1928 lio_listio(struct thread *td, struct lio_listio_args *uap)
1929 {
1930 struct proc *p = td->td_proc;
1931 int nent, nentqueued;
1932 struct aiocb *iocb, * const *cbptr;
1933 struct aiocblist *cb;
1934 struct kaioinfo *ki;
1935 struct aio_liojob *lj;
1936 int error, runningcode;
1937 int nerror;
1938 int i;
1939 int s;
1940
1941 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
1942 return EINVAL;
1943
1944 nent = uap->nent;
1945 if (nent > AIO_LISTIO_MAX)
1946 return EINVAL;
1947
1948 if (p->p_aioinfo == NULL)
1949 aio_init_aioinfo(p);
1950
1951 if ((nent + num_queue_count) > max_queue_count)
1952 return EAGAIN;
1953
1954 ki = p->p_aioinfo;
1955 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count)
1956 return EAGAIN;
1957
1958 lj = uma_zalloc(aiolio_zone, M_WAITOK);
1959 if (!lj)
1960 return EAGAIN;
1961
1962 lj->lioj_flags = 0;
1963 lj->lioj_buffer_count = 0;
1964 lj->lioj_buffer_finished_count = 0;
1965 lj->lioj_queue_count = 0;
1966 lj->lioj_queue_finished_count = 0;
1967 lj->lioj_ki = ki;
1968
1969 /*
1970 * Setup signal.
1971 */
1972 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
1973 error = copyin(uap->sig, &lj->lioj_signal,
1974 sizeof(lj->lioj_signal));
1975 if (error) {
1976 uma_zfree(aiolio_zone, lj);
1977 return error;
1978 }
1979 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
1980 uma_zfree(aiolio_zone, lj);
1981 return EINVAL;
1982 }
1983 lj->lioj_flags |= LIOJ_SIGNAL;
1984 }
1985 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
1986 /*
1987 * Get pointers to the list of I/O requests.
1988 */
1989 nerror = 0;
1990 nentqueued = 0;
1991 cbptr = uap->acb_list;
1992 for (i = 0; i < uap->nent; i++) {
1993 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
1994 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) {
1995 error = _aio_aqueue(td, iocb, lj, 0);
1996 if (error == 0)
1997 nentqueued++;
1998 else
1999 nerror++;
2000 }
2001 }
2002
2003 /*
2004 * If we haven't queued any, then just return error.
2005 */
2006 if (nentqueued == 0)
2007 return 0;
2008
2009 /*
2010 * Calculate the appropriate error return.
2011 */
2012 runningcode = 0;
2013 if (nerror)
2014 runningcode = EIO;
2015
2016 if (uap->mode == LIO_WAIT) {
2017 int command, found, jobref;
2018
2019 for (;;) {
2020 found = 0;
2021 for (i = 0; i < uap->nent; i++) {
2022 /*
2023 * Fetch address of the control buf pointer in
2024 * user space.
2025 */
2026 iocb = (struct aiocb *)
2027 (intptr_t)fuword(&cbptr[i]);
2028 if (((intptr_t)iocb == -1) || ((intptr_t)iocb
2029 == 0))
2030 continue;
2031
2032 /*
2033 * Fetch the associated command from user space.
2034 */
2035 command = fuword(&iocb->aio_lio_opcode);
2036 if (command == LIO_NOP) {
2037 found++;
2038 continue;
2039 }
2040
2041 jobref = fuword(&iocb->_aiocb_private.kernelinfo);
2042
2043 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
2044 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo)
2045 == jobref) {
2046 if (cb->uaiocb.aio_lio_opcode
2047 == LIO_WRITE) {
2048 p->p_stats->p_ru.ru_oublock
2049 +=
2050 cb->outputcharge;
2051 cb->outputcharge = 0;
2052 } else if (cb->uaiocb.aio_lio_opcode
2053 == LIO_READ) {
2054 p->p_stats->p_ru.ru_inblock
2055 += cb->inputcharge;
2056 cb->inputcharge = 0;
2057 }
2058 found++;
2059 break;
2060 }
2061 }
2062
2063 s = splbio();
2064 TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) {
2065 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo)
2066 == jobref) {
2067 found++;
2068 break;
2069 }
2070 }
2071 splx(s);
2072 }
2073
2074 /*
2075 * If all I/Os have been disposed of, then we can
2076 * return.
2077 */
2078 if (found == nentqueued)
2079 return runningcode;
2080
2081 ki->kaio_flags |= KAIO_WAKEUP;
2082 error = tsleep(p, PRIBIO | PCATCH, "aiospn", 0);
2083
2084 if (error == EINTR)
2085 return EINTR;
2086 else if (error == EWOULDBLOCK)
2087 return EAGAIN;
2088 }
2089 }
2090
2091 return runningcode;
2092 }
2093
2094 /*
2095 * This is a weird hack so that we can post a signal. It is safe to do so from
2096 * a timeout routine, but *not* from an interrupt routine.
2097 */
2098 static void
2099 process_signal(void *aioj)
2100 {
2101 struct aiocblist *aiocbe = aioj;
2102 struct aio_liojob *lj = aiocbe->lio;
2103 struct aiocb *cb = &aiocbe->uaiocb;
2104
2105 if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) &&
2106 (lj->lioj_queue_count == lj->lioj_queue_finished_count)) {
2107 PROC_LOCK(lj->lioj_ki->kaio_p);
2108 psignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo);
2109 PROC_UNLOCK(lj->lioj_ki->kaio_p);
2110 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
2111 }
2112
2113 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
2114 PROC_LOCK(aiocbe->userproc);
2115 psignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo);
2116 PROC_UNLOCK(aiocbe->userproc);
2117 }
2118 }
2119
2120 /*
2121 * Interrupt handler for physio, performs the necessary process wakeups, and
2122 * signals.
2123 */
2124 static void
2125 aio_physwakeup(struct buf *bp)
2126 {
2127 struct aiocblist *aiocbe;
2128 struct proc *p;
2129 struct kaioinfo *ki;
2130 struct aio_liojob *lj;
2131
2132 wakeup(bp);
2133
2134 aiocbe = (struct aiocblist *)bp->b_spc;
2135 if (aiocbe) {
2136 p = bp->b_caller1;
2137
2138 aiocbe->jobstate = JOBST_JOBBFINISHED;
2139 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid;
2140 aiocbe->uaiocb._aiocb_private.error = 0;
2141 aiocbe->jobflags |= AIOCBLIST_DONE;
2142
2143 if (bp->b_ioflags & BIO_ERROR)
2144 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
2145
2146 lj = aiocbe->lio;
2147 if (lj) {
2148 lj->lioj_buffer_finished_count++;
2149
2150 /*
2151 * wakeup/signal if all of the interrupt jobs are done.
2152 */
2153 if (lj->lioj_buffer_finished_count ==
2154 lj->lioj_buffer_count) {
2155 /*
2156 * Post a signal if it is called for.
2157 */
2158 if ((lj->lioj_flags &
2159 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) ==
2160 LIOJ_SIGNAL) {
2161 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
2162 aiocbe->timeouthandle =
2163 timeout(process_signal,
2164 aiocbe, 0);
2165 }
2166 }
2167 }
2168
2169 ki = p->p_aioinfo;
2170 if (ki) {
2171 ki->kaio_buffer_finished_count++;
2172 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list);
2173 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist);
2174 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist);
2175
2176 KNOTE(&aiocbe->klist, 0);
2177 /* Do the wakeup. */
2178 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) {
2179 ki->kaio_flags &= ~KAIO_WAKEUP;
2180 wakeup(p);
2181 }
2182 }
2183
2184 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL)
2185 aiocbe->timeouthandle =
2186 timeout(process_signal, aiocbe, 0);
2187 }
2188 }
2189
2190 /* syscall - wait for the next completion of an aio request */
2191 int
2192 aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap)
2193 {
2194 struct proc *p = td->td_proc;
2195 struct timeval atv;
2196 struct timespec ts;
2197 struct kaioinfo *ki;
2198 struct aiocblist *cb = NULL;
2199 int error, s, timo;
2200
2201 suword(uap->aiocbp, (int)NULL);
2202
2203 timo = 0;
2204 if (uap->timeout) {
2205 /* Get timespec struct. */
2206 error = copyin(uap->timeout, &ts, sizeof(ts));
2207 if (error)
2208 return error;
2209
2210 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000))
2211 return (EINVAL);
2212
2213 TIMESPEC_TO_TIMEVAL(&atv, &ts);
2214 if (itimerfix(&atv))
2215 return (EINVAL);
2216 timo = tvtohz(&atv);
2217 }
2218
2219 ki = p->p_aioinfo;
2220 if (ki == NULL)
2221 return EAGAIN;
2222
2223 for (;;) {
2224 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) {
2225 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
2226 td->td_retval[0] = cb->uaiocb._aiocb_private.status;
2227 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
2228 p->p_stats->p_ru.ru_oublock +=
2229 cb->outputcharge;
2230 cb->outputcharge = 0;
2231 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
2232 p->p_stats->p_ru.ru_inblock += cb->inputcharge;
2233 cb->inputcharge = 0;
2234 }
2235 aio_free_entry(cb);
2236 return cb->uaiocb._aiocb_private.error;
2237 }
2238
2239 s = splbio();
2240 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) {
2241 splx(s);
2242 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
2243 td->td_retval[0] = cb->uaiocb._aiocb_private.status;
2244 aio_free_entry(cb);
2245 return cb->uaiocb._aiocb_private.error;
2246 }
2247
2248 ki->kaio_flags |= KAIO_WAKEUP;
2249 error = tsleep(p, PRIBIO | PCATCH, "aiowc", timo);
2250 splx(s);
2251
2252 if (error == ERESTART)
2253 return EINTR;
2254 else if (error < 0)
2255 return error;
2256 else if (error == EINTR)
2257 return EINTR;
2258 else if (error == EWOULDBLOCK)
2259 return EAGAIN;
2260 }
2261 }
2262
2263 /* kqueue attach function */
2264 static int
2265 filt_aioattach(struct knote *kn)
2266 {
2267 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2268
2269 /*
2270 * The aiocbe pointer must be validated before using it, so
2271 * registration is restricted to the kernel; the user cannot
2272 * set EV_FLAG1.
2273 */
2274 if ((kn->kn_flags & EV_FLAG1) == 0)
2275 return (EPERM);
2276 kn->kn_flags &= ~EV_FLAG1;
2277
2278 SLIST_INSERT_HEAD(&aiocbe->klist, kn, kn_selnext);
2279
2280 return (0);
2281 }
2282
2283 /* kqueue detach function */
2284 static void
2285 filt_aiodetach(struct knote *kn)
2286 {
2287 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2288
2289 SLIST_REMOVE(&aiocbe->klist, kn, knote, kn_selnext);
2290 }
2291
2292 /* kqueue filter function */
2293 /*ARGSUSED*/
2294 static int
2295 filt_aio(struct knote *kn, long hint)
2296 {
2297 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2298
2299 kn->kn_data = aiocbe->uaiocb._aiocb_private.error;
2300 if (aiocbe->jobstate != JOBST_JOBFINISHED &&
2301 aiocbe->jobstate != JOBST_JOBBFINISHED)
2302 return (0);
2303 kn->kn_flags |= EV_EOF;
2304 return (1);
2305 }
Cache object: 33192c198929c08d478915800469e332
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