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kern - Convert aio from zalloc to objcache
[dragonfly.git] / sys / kern / vfs_aio.c
blob4fd95424ba88e1c2a2ba0bdb47555556db3baffc
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 #include <sys/objcache.h>
44
45 #include <vm/vm.h>
46 #include <vm/vm_extern.h>
47 #include <vm/pmap.h>
48 #include <vm/vm_map.h>
49 #include <sys/aio.h>
50
51 #include <sys/file2.h>
52 #include <sys/buf2.h>
53 #include <sys/sysref2.h>
54 #include <sys/thread2.h>
55 #include <sys/mplock2.h>
56
57 #include <machine/limits.h>
58 #include "opt_vfs_aio.h"
59
60 #ifdef VFS_AIO
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 max_aio_per_proc = MAX_AIO_PER_PROC;
152 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
153 0, "Maximum active aio requests per process (stored in the process)");
154
155 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
156 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
157 &max_aio_queue_per_proc, 0,
158 "Maximum queued aio requests per process (stored in the process)");
159
160 static int max_buf_aio = MAX_BUF_AIO;
161 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
162 "Maximum buf aio requests per process (stored in the process)");
163
164 /*
165 * AIO process info
166 */
167 #define AIOP_FREE 0x1 /* proc on free queue */
168 #define AIOP_SCHED 0x2 /* proc explicitly scheduled */
169
170 struct aioproclist {
171 int aioprocflags; /* AIO proc flags */
172 TAILQ_ENTRY(aioproclist) list; /* List of processes */
173 struct proc *aioproc; /* The AIO thread */
174 };
175
176 /*
177 * data-structure for lio signal management
178 */
179 struct aio_liojob {
180 int lioj_flags;
181 int lioj_buffer_count;
182 int lioj_buffer_finished_count;
183 int lioj_queue_count;
184 int lioj_queue_finished_count;
185 struct sigevent lioj_signal; /* signal on all I/O done */
186 TAILQ_ENTRY(aio_liojob) lioj_list;
187 struct kaioinfo *lioj_ki;
188 };
189 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */
190 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */
191
192 /*
193 * per process aio data structure
194 */
195 struct kaioinfo {
196 int kaio_flags; /* per process kaio flags */
197 int kaio_maxactive_count; /* maximum number of AIOs */
198 int kaio_active_count; /* number of currently used AIOs */
199 int kaio_qallowed_count; /* maxiumu size of AIO queue */
200 int kaio_queue_count; /* size of AIO queue */
201 int kaio_ballowed_count; /* maximum number of buffers */
202 int kaio_queue_finished_count; /* number of daemon jobs finished */
203 int kaio_buffer_count; /* number of physio buffers */
204 int kaio_buffer_finished_count; /* count of I/O done */
205 struct proc *kaio_p; /* process that uses this kaio block */
206 TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */
207 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */
208 TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */
209 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */
210 TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */
211 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */
212 };
213
214 #define KAIO_RUNDOWN 0x1 /* process is being run down */
215 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */
216
217 static TAILQ_HEAD(,aioproclist) aio_freeproc, aio_activeproc;
218 static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */
219 static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */
220 static TAILQ_HEAD(,aiocblist) aio_freejobs; /* Pool of free jobs */
221
222 static void aio_init_aioinfo(struct proc *p);
223 static void aio_onceonly(void *);
224 static int aio_free_entry(struct aiocblist *aiocbe);
225 static void aio_process(struct aiocblist *aiocbe);
226 static int aio_newproc(void);
227 static int aio_aqueue(struct aiocb *job, int type);
228 static void aio_physwakeup(struct bio *bio);
229 static int aio_fphysio(struct aiocblist *aiocbe);
230 static int aio_qphysio(struct proc *p, struct aiocblist *iocb);
231 static void aio_daemon(void *uproc, struct trapframe *frame);
232 static void process_signal(void *aioj);
233
234 SYSINIT(aio, SI_SUB_VFS, SI_ORDER_ANY, aio_onceonly, NULL);
235
236 /*
237 * Zones for:
238 * kaio Per process async io info
239 * aiop async io thread data
240 * aiocb async io jobs
241 * aiol list io job pointer - internal to aio_suspend XXX
242 * aiolio list io jobs
243 */
244 static struct objcache *kaio_oc, *aiop_oc, *aiocb_oc, *aiol_oc, *aiolio_oc;
245
246 static MALLOC_DEFINE(M_AIO, "AIO", "AIO");
247 static MALLOC_DEFINE(M_AIOP, "AIO proc", "AIO process");
248 static MALLOC_DEFINE(M_AIOCB, "AIO cb", "AIO cb");
249 static MALLOC_DEFINE(M_AIOL, "AIO list io", "AIO list io");
250 static MALLOC_DEFINE(M_AIOLIO, "AIO list io job", "AIO list io job");
251
252 /*
253 * Startup initialization
254 */
255 static void
256 aio_onceonly(void *na)
257 {
258 TAILQ_INIT(&aio_freeproc);
259 TAILQ_INIT(&aio_activeproc);
260 TAILQ_INIT(&aio_jobs);
261 TAILQ_INIT(&aio_bufjobs);
262 TAILQ_INIT(&aio_freejobs);
263 kaio_oc = objcache_create_simple(M_AIO, sizeof(struct kaioinfo));
264 aiop_oc = objcache_create_simple(M_AIOP, sizeof(struct aioproclist));
265 aiocb_oc = objcache_create_simple(M_AIOCB, sizeof(struct aiocblist));
266 aiol_oc = objcache_create_simple(M_AIOL, AIO_LISTIO_MAX*sizeof(intptr_t));
267 aiolio_oc = objcache_create_simple(M_AIOLIO, sizeof(struct aio_liojob));
268 aiod_timeout = AIOD_TIMEOUT_DEFAULT;
269 aiod_lifetime = AIOD_LIFETIME_DEFAULT;
270 jobrefid = 1;
271 }
272
273 /*
274 * Init the per-process aioinfo structure. The aioinfo limits are set
275 * per-process for user limit (resource) management.
276 */
277 static void
278 aio_init_aioinfo(struct proc *p)
279 {
280 struct kaioinfo *ki;
281 if (p->p_aioinfo == NULL) {
282 ki = objcache_get(kaio_oc, M_WAITOK);
283 p->p_aioinfo = ki;
284 ki->kaio_flags = 0;
285 ki->kaio_maxactive_count = max_aio_per_proc;
286 ki->kaio_active_count = 0;
287 ki->kaio_qallowed_count = max_aio_queue_per_proc;
288 ki->kaio_queue_count = 0;
289 ki->kaio_ballowed_count = max_buf_aio;
290 ki->kaio_buffer_count = 0;
291 ki->kaio_buffer_finished_count = 0;
292 ki->kaio_p = p;
293 TAILQ_INIT(&ki->kaio_jobdone);
294 TAILQ_INIT(&ki->kaio_jobqueue);
295 TAILQ_INIT(&ki->kaio_bufdone);
296 TAILQ_INIT(&ki->kaio_bufqueue);
297 TAILQ_INIT(&ki->kaio_liojoblist);
298 TAILQ_INIT(&ki->kaio_sockqueue);
299 }
300
301 while (num_aio_procs < target_aio_procs)
302 aio_newproc();
303 }
304
305 /*
306 * Free a job entry. Wait for completion if it is currently active, but don't
307 * delay forever. If we delay, we return a flag that says that we have to
308 * restart the queue scan.
309 */
310 static int
311 aio_free_entry(struct aiocblist *aiocbe)
312 {
313 struct kaioinfo *ki;
314 struct aio_liojob *lj;
315 struct proc *p;
316 int error;
317
318 if (aiocbe->jobstate == JOBST_NULL)
319 panic("aio_free_entry: freeing already free job");
320
321 p = aiocbe->userproc;
322 ki = p->p_aioinfo;
323 lj = aiocbe->lio;
324 if (ki == NULL)
325 panic("aio_free_entry: missing p->p_aioinfo");
326
327 while (aiocbe->jobstate == JOBST_JOBRUNNING) {
328 aiocbe->jobflags |= AIOCBLIST_RUNDOWN;
329 tsleep(aiocbe, 0, "jobwai", 0);
330 }
331 if (aiocbe->bp == NULL) {
332 if (ki->kaio_queue_count <= 0)
333 panic("aio_free_entry: process queue size <= 0");
334 if (num_queue_count <= 0)
335 panic("aio_free_entry: system wide queue size <= 0");
336
337 if (lj) {
338 lj->lioj_queue_count--;
339 if (aiocbe->jobflags & AIOCBLIST_DONE)
340 lj->lioj_queue_finished_count--;
341 }
342 ki->kaio_queue_count--;
343 if (aiocbe->jobflags & AIOCBLIST_DONE)
344 ki->kaio_queue_finished_count--;
345 num_queue_count--;
346 } else {
347 if (lj) {
348 lj->lioj_buffer_count--;
349 if (aiocbe->jobflags & AIOCBLIST_DONE)
350 lj->lioj_buffer_finished_count--;
351 }
352 if (aiocbe->jobflags & AIOCBLIST_DONE)
353 ki->kaio_buffer_finished_count--;
354 ki->kaio_buffer_count--;
355 num_buf_aio--;
356 }
357
358 /* aiocbe is going away, we need to destroy any knotes */
359 /* XXX lwp knote wants a thread, but only cares about the process */
360 knote_empty(&aiocbe->klist);
361
362 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN)
363 && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) {
364 ki->kaio_flags &= ~KAIO_WAKEUP;
365 wakeup(p);
366 }
367
368 if (aiocbe->jobstate == JOBST_JOBQBUF) {
369 if ((error = aio_fphysio(aiocbe)) != 0)
370 return error;
371 if (aiocbe->jobstate != JOBST_JOBBFINISHED)
372 panic("aio_free_entry: invalid physio finish-up state");
373 crit_enter();
374 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist);
375 crit_exit();
376 } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) {
377 crit_enter();
378 TAILQ_REMOVE(&aio_jobs, aiocbe, list);
379 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
380 crit_exit();
381 } else if (aiocbe->jobstate == JOBST_JOBFINISHED)
382 TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist);
383 else if (aiocbe->jobstate == JOBST_JOBBFINISHED) {
384 crit_enter();
385 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist);
386 crit_exit();
387 if (aiocbe->bp) {
388 vunmapbuf(aiocbe->bp);
389 relpbuf(aiocbe->bp, NULL);
390 aiocbe->bp = NULL;
391 }
392 }
393 if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) {
394 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
395 objcache_put(aiolio_oc, lj);
396 }
397 aiocbe->jobstate = JOBST_NULL;
398 callout_stop(&aiocbe->timeout);
399 fdrop(aiocbe->fd_file);
400 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
401 return 0;
402 }
403 #endif /* VFS_AIO */
404
405 /*
406 * Rundown the jobs for a given process.
407 */
408 void
409 aio_proc_rundown(struct proc *p)
410 {
411 #ifndef VFS_AIO
412 return;
413 #else
414 struct kaioinfo *ki;
415 struct aio_liojob *lj, *ljn;
416 struct aiocblist *aiocbe, *aiocbn;
417 struct file *fp;
418 struct socket *so;
419
420 ki = p->p_aioinfo;
421 if (ki == NULL)
422 return;
423
424 ki->kaio_flags |= LIOJ_SIGNAL_POSTED;
425 while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count >
426 ki->kaio_buffer_finished_count)) {
427 ki->kaio_flags |= KAIO_RUNDOWN;
428 if (tsleep(p, 0, "kaiowt", aiod_timeout))
429 break;
430 }
431
432 /*
433 * Move any aio ops that are waiting on socket I/O to the normal job
434 * queues so they are cleaned up with any others.
435 */
436 crit_enter();
437 for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe =
438 aiocbn) {
439 aiocbn = TAILQ_NEXT(aiocbe, plist);
440 fp = aiocbe->fd_file;
441 if (fp != NULL) {
442 so = (struct socket *)fp->f_data;
443 TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list);
444 if (TAILQ_EMPTY(&so->so_aiojobq)) {
445 atomic_clear_int(&so->so_snd.ssb_flags,
446 SSB_AIO);
447 atomic_clear_int(&so->so_rcv.ssb_flags,
448 SSB_AIO);
449 }
450 }
451 TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist);
452 TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list);
453 TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist);
454 }
455 crit_exit();
456
457 restart1:
458 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) {
459 aiocbn = TAILQ_NEXT(aiocbe, plist);
460 if (aio_free_entry(aiocbe))
461 goto restart1;
462 }
463
464 restart2:
465 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue); aiocbe; aiocbe =
466 aiocbn) {
467 aiocbn = TAILQ_NEXT(aiocbe, plist);
468 if (aio_free_entry(aiocbe))
469 goto restart2;
470 }
471
472 restart3:
473 crit_enter();
474 while (TAILQ_FIRST(&ki->kaio_bufqueue)) {
475 ki->kaio_flags |= KAIO_WAKEUP;
476 tsleep(p, 0, "aioprn", 0);
477 crit_exit();
478 goto restart3;
479 }
480 crit_exit();
481
482 restart4:
483 crit_enter();
484 for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) {
485 aiocbn = TAILQ_NEXT(aiocbe, plist);
486 if (aio_free_entry(aiocbe)) {
487 crit_exit();
488 goto restart4;
489 }
490 }
491 crit_exit();
492
493 /*
494 * If we've slept, jobs might have moved from one queue to another.
495 * Retry rundown if we didn't manage to empty the queues.
496 */
497 if (TAILQ_FIRST(&ki->kaio_jobdone) != NULL ||
498 TAILQ_FIRST(&ki->kaio_jobqueue) != NULL ||
499 TAILQ_FIRST(&ki->kaio_bufqueue) != NULL ||
500 TAILQ_FIRST(&ki->kaio_bufdone) != NULL)
501 goto restart1;
502
503 for (lj = TAILQ_FIRST(&ki->kaio_liojoblist); lj; lj = ljn) {
504 ljn = TAILQ_NEXT(lj, lioj_list);
505 if ((lj->lioj_buffer_count == 0) && (lj->lioj_queue_count ==
506 0)) {
507 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
508 objcache_put(aiolio_oc, lj);
509 } else {
510 #ifdef DIAGNOSTIC
511 kprintf("LIO job not cleaned up: B:%d, BF:%d, Q:%d, "
512 "QF:%d\n", lj->lioj_buffer_count,
513 lj->lioj_buffer_finished_count,
514 lj->lioj_queue_count,
515 lj->lioj_queue_finished_count);
516 #endif
517 }
518 }
519
520 objcache_put(kaio_oc, ki);
521 p->p_aioinfo = NULL;
522 #endif /* VFS_AIO */
523 }
524
525 #ifdef VFS_AIO
526 /*
527 * Select a job to run (called by an AIO daemon).
528 */
529 static struct aiocblist *
530 aio_selectjob(struct aioproclist *aiop)
531 {
532 struct aiocblist *aiocbe;
533 struct kaioinfo *ki;
534 struct proc *userp;
535
536 crit_enter();
537 for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe =
538 TAILQ_NEXT(aiocbe, list)) {
539 userp = aiocbe->userproc;
540 ki = userp->p_aioinfo;
541
542 if (ki->kaio_active_count < ki->kaio_maxactive_count) {
543 TAILQ_REMOVE(&aio_jobs, aiocbe, list);
544 crit_exit();
545 return aiocbe;
546 }
547 }
548 crit_exit();
549
550 return NULL;
551 }
552
553 /*
554 * The AIO processing activity. This is the code that does the I/O request for
555 * the non-physio version of the operations. The normal vn operations are used,
556 * and this code should work in all instances for every type of file, including
557 * pipes, sockets, fifos, and regular files.
558 */
559 static void
560 aio_process(struct aiocblist *aiocbe)
561 {
562 struct thread *mytd;
563 struct aiocb *cb;
564 struct file *fp;
565 struct uio auio;
566 struct iovec aiov;
567 int cnt;
568 int error;
569 int oublock_st, oublock_end;
570 int inblock_st, inblock_end;
571
572 mytd = curthread;
573 cb = &aiocbe->uaiocb;
574 fp = aiocbe->fd_file;
575
576 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
577 aiov.iov_len = cb->aio_nbytes;
578
579 auio.uio_iov = &aiov;
580 auio.uio_iovcnt = 1;
581 auio.uio_offset = cb->aio_offset;
582 auio.uio_resid = cb->aio_nbytes;
583 cnt = cb->aio_nbytes;
584 auio.uio_segflg = UIO_USERSPACE;
585 auio.uio_td = mytd;
586
587 inblock_st = mytd->td_lwp->lwp_ru.ru_inblock;
588 oublock_st = mytd->td_lwp->lwp_ru.ru_oublock;
589 /*
590 * _aio_aqueue() acquires a reference to the file that is
591 * released in aio_free_entry().
592 */
593 if (cb->aio_lio_opcode == LIO_READ) {
594 auio.uio_rw = UIO_READ;
595 error = fo_read(fp, &auio, fp->f_cred, O_FOFFSET);
596 } else {
597 auio.uio_rw = UIO_WRITE;
598 error = fo_write(fp, &auio, fp->f_cred, O_FOFFSET);
599 }
600 inblock_end = mytd->td_lwp->lwp_ru.ru_inblock;
601 oublock_end = mytd->td_lwp->lwp_ru.ru_oublock;
602
603 aiocbe->inputcharge = inblock_end - inblock_st;
604 aiocbe->outputcharge = oublock_end - oublock_st;
605
606 if ((error) && (auio.uio_resid != cnt)) {
607 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
608 error = 0;
609 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE))
610 ksignal(aiocbe->userproc, SIGPIPE);
611 }
612
613 cnt -= auio.uio_resid;
614 cb->_aiocb_private.error = error;
615 cb->_aiocb_private.status = cnt;
616 }
617
618 /*
619 * The AIO daemon, most of the actual work is done in aio_process,
620 * but the setup (and address space mgmt) is done in this routine.
621 */
622 static void
623 aio_daemon(void *uproc, struct trapframe *frame)
624 {
625 struct aio_liojob *lj;
626 struct aiocb *cb;
627 struct aiocblist *aiocbe;
628 struct aioproclist *aiop;
629 struct kaioinfo *ki;
630 struct proc *mycp, *userp;
631 struct vmspace *curvm;
632 struct lwp *mylwp;
633 struct ucred *cr;
634
635 /*
636 * mplock not held on entry but we aren't mpsafe yet.
637 */
638 get_mplock();
639
640 mylwp = curthread->td_lwp;
641 mycp = mylwp->lwp_proc;
642
643 if (mycp->p_textvp) {
644 vrele(mycp->p_textvp);
645 mycp->p_textvp = NULL;
646 }
647
648 /*
649 * Allocate and ready the aio control info. There is one aiop structure
650 * per daemon.
651 */
652 aiop = objcache_get(aiop_oc, M_WAITOK);
653 aiop->aioproc = mycp;
654 aiop->aioprocflags |= AIOP_FREE;
655
656 crit_enter();
657
658 /*
659 * Place thread (lightweight process) onto the AIO free thread list.
660 */
661 if (TAILQ_EMPTY(&aio_freeproc))
662 wakeup(&aio_freeproc);
663 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
664
665 crit_exit();
666
667 /* Make up a name for the daemon. */
668 strcpy(mycp->p_comm, "aiod");
669
670 /*
671 * Get rid of our current filedescriptors. AIOD's don't need any
672 * filedescriptors, except as temporarily inherited from the client.
673 * Credentials are also cloned, and made equivalent to "root".
674 */
675 fdfree(mycp, NULL);
676 cr = cratom(&mycp->p_ucred);
677 cr->cr_uid = 0;
678 uireplace(&cr->cr_uidinfo, uifind(0));
679 cr->cr_ngroups = 1;
680 cr->cr_groups[0] = 1;
681
682 /* The daemon resides in its own pgrp. */
683 enterpgrp(mycp, mycp->p_pid, 1);
684
685 /* Mark special process type. */
686 mycp->p_flag |= P_SYSTEM | P_KTHREADP;
687
688 /*
689 * Wakeup parent process. (Parent sleeps to keep from blasting away
690 * and creating too many daemons.)
691 */
692 wakeup(mycp);
693 curvm = NULL;
694
695 for (;;) {
696 /*
697 * Take daemon off of free queue
698 */
699 if (aiop->aioprocflags & AIOP_FREE) {
700 crit_enter();
701 TAILQ_REMOVE(&aio_freeproc, aiop, list);
702 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
703 aiop->aioprocflags &= ~AIOP_FREE;
704 crit_exit();
705 }
706 aiop->aioprocflags &= ~AIOP_SCHED;
707
708 /*
709 * Check for jobs.
710 */
711 while ((aiocbe = aio_selectjob(aiop)) != NULL) {
712 cb = &aiocbe->uaiocb;
713 userp = aiocbe->userproc;
714
715 aiocbe->jobstate = JOBST_JOBRUNNING;
716
717 /*
718 * Connect to process address space for user program.
719 */
720 if (curvm != userp->p_vmspace) {
721 pmap_setlwpvm(mylwp, userp->p_vmspace);
722 if (curvm)
723 sysref_put(&curvm->vm_sysref);
724 curvm = userp->p_vmspace;
725 sysref_get(&curvm->vm_sysref);
726 }
727
728 ki = userp->p_aioinfo;
729 lj = aiocbe->lio;
730
731 /* Account for currently active jobs. */
732 ki->kaio_active_count++;
733
734 /* Do the I/O function. */
735 aio_process(aiocbe);
736
737 /* Decrement the active job count. */
738 ki->kaio_active_count--;
739
740 /*
741 * Increment the completion count for wakeup/signal
742 * comparisons.
743 */
744 aiocbe->jobflags |= AIOCBLIST_DONE;
745 ki->kaio_queue_finished_count++;
746 if (lj)
747 lj->lioj_queue_finished_count++;
748 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags
749 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) {
750 ki->kaio_flags &= ~KAIO_WAKEUP;
751 wakeup(userp);
752 }
753
754 crit_enter();
755 if (lj && (lj->lioj_flags &
756 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) {
757 if ((lj->lioj_queue_finished_count ==
758 lj->lioj_queue_count) &&
759 (lj->lioj_buffer_finished_count ==
760 lj->lioj_buffer_count)) {
761 ksignal(userp,
762 lj->lioj_signal.sigev_signo);
763 lj->lioj_flags |=
764 LIOJ_SIGNAL_POSTED;
765 }
766 }
767 crit_exit();
768
769 aiocbe->jobstate = JOBST_JOBFINISHED;
770
771 crit_enter();
772 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
773 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist);
774 crit_exit();
775 KNOTE(&aiocbe->klist, 0);
776
777 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) {
778 wakeup(aiocbe);
779 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
780 }
781
782 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
783 ksignal(userp, cb->aio_sigevent.sigev_signo);
784 }
785 }
786
787 /*
788 * Disconnect from user address space.
789 */
790 if (curvm) {
791 /* swap our original address space back in */
792 pmap_setlwpvm(mylwp, mycp->p_vmspace);
793 sysref_put(&curvm->vm_sysref);
794 curvm = NULL;
795 }
796
797 /*
798 * If we are the first to be put onto the free queue, wakeup
799 * anyone waiting for a daemon.
800 */
801 crit_enter();
802 TAILQ_REMOVE(&aio_activeproc, aiop, list);
803 if (TAILQ_EMPTY(&aio_freeproc))
804 wakeup(&aio_freeproc);
805 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
806 aiop->aioprocflags |= AIOP_FREE;
807 crit_exit();
808
809 /*
810 * If daemon is inactive for a long time, allow it to exit,
811 * thereby freeing resources.
812 */
813 if (((aiop->aioprocflags & AIOP_SCHED) == 0) && tsleep(mycp,
814 0, "aiordy", aiod_lifetime)) {
815 crit_enter();
816 if (TAILQ_EMPTY(&aio_jobs)) {
817 if ((aiop->aioprocflags & AIOP_FREE) &&
818 (num_aio_procs > target_aio_procs)) {
819 TAILQ_REMOVE(&aio_freeproc, aiop, list);
820 crit_exit();
821 objcache_put(aiop_oc, aiop);
822 num_aio_procs--;
823 #ifdef DIAGNOSTIC
824 if (mycp->p_vmspace->vm_sysref.refcnt <= 1) {
825 kprintf("AIOD: bad vm refcnt for"
826 " exiting daemon: %d\n",
827 mycp->p_vmspace->vm_sysref.refcnt);
828 }
829 #endif
830 exit1(0);
831 }
832 }
833 crit_exit();
834 }
835 }
836 }
837
838 /*
839 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
840 * AIO daemon modifies its environment itself.
841 */
842 static int
843 aio_newproc(void)
844 {
845 int error;
846 struct lwp *lp, *nlp;
847 struct proc *np;
848
849 lp = &lwp0;
850 error = fork1(lp, RFPROC|RFMEM|RFNOWAIT, &np);
851 if (error)
852 return error;
853 nlp = ONLY_LWP_IN_PROC(np);
854 cpu_set_fork_handler(nlp, aio_daemon, curproc);
855 start_forked_proc(lp, np);
856
857 /*
858 * Wait until daemon is started, but continue on just in case to
859 * handle error conditions.
860 */
861 error = tsleep(np, 0, "aiosta", aiod_timeout);
862 num_aio_procs++;
863
864 return error;
865 }
866
867 /*
868 * Try the high-performance, low-overhead physio method for eligible
869 * VCHR devices. This method doesn't use an aio helper thread, and
870 * thus has very low overhead.
871 *
872 * Assumes that the caller, _aio_aqueue(), has incremented the file
873 * structure's reference count, preventing its deallocation for the
874 * duration of this call.
875 */
876 static int
877 aio_qphysio(struct proc *p, struct aiocblist *aiocbe)
878 {
879 int error;
880 struct aiocb *cb;
881 struct file *fp;
882 struct buf *bp;
883 struct vnode *vp;
884 struct kaioinfo *ki;
885 struct aio_liojob *lj;
886 int notify;
887
888 cb = &aiocbe->uaiocb;
889 fp = aiocbe->fd_file;
890
891 if (fp->f_type != DTYPE_VNODE)
892 return (-1);
893
894 vp = (struct vnode *)fp->f_data;
895
896 /*
897 * If its not a disk, we don't want to return a positive error.
898 * It causes the aio code to not fall through to try the thread
899 * way when you're talking to a regular file.
900 */
901 if (!vn_isdisk(vp, &error)) {
902 if (error == ENOTBLK)
903 return (-1);
904 else
905 return (error);
906 }
907
908 if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys)
909 return (-1);
910
911 if (cb->aio_nbytes >
912 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK))
913 return (-1);
914
915 ki = p->p_aioinfo;
916 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count)
917 return (-1);
918
919 ki->kaio_buffer_count++;
920
921 lj = aiocbe->lio;
922 if (lj)
923 lj->lioj_buffer_count++;
924
925 /* Create and build a buffer header for a transfer. */
926 bp = getpbuf_kva(NULL);
927 BUF_KERNPROC(bp);
928
929 /*
930 * Get a copy of the kva from the physical buffer.
931 */
932 bp->b_bio1.bio_caller_info1.ptr = p;
933 error = 0;
934
935 bp->b_cmd = (cb->aio_lio_opcode == LIO_WRITE) ?
936 BUF_CMD_WRITE : BUF_CMD_READ;
937 bp->b_bio1.bio_done = aio_physwakeup;
938 bp->b_bio1.bio_flags |= BIO_SYNC;
939 bp->b_bio1.bio_offset = cb->aio_offset;
940
941 /* Bring buffer into kernel space. */
942 if (vmapbuf(bp, __DEVOLATILE(char *, cb->aio_buf), cb->aio_nbytes) < 0) {
943 error = EFAULT;
944 goto doerror;
945 }
946
947 crit_enter();
948
949 aiocbe->bp = bp;
950 bp->b_bio1.bio_caller_info2.ptr = aiocbe;
951 TAILQ_INSERT_TAIL(&aio_bufjobs, aiocbe, list);
952 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist);
953 aiocbe->jobstate = JOBST_JOBQBUF;
954 cb->_aiocb_private.status = cb->aio_nbytes;
955 num_buf_aio++;
956 bp->b_error = 0;
957
958 crit_exit();
959
960 /*
961 * Perform the transfer. vn_strategy must be used even though we
962 * know we have a device in order to deal with requests which exceed
963 * device DMA limitations.
964 */
965 vn_strategy(vp, &bp->b_bio1);
966
967 notify = 0;
968 crit_enter();
969
970 #if 0
971 /*
972 * If we had an error invoking the request, or an error in processing
973 * the request before we have returned, we process it as an error in
974 * transfer. Note that such an I/O error is not indicated immediately,
975 * but is returned using the aio_error mechanism. In this case,
976 * aio_suspend will return immediately.
977 */
978 if (bp->b_error || (bp->b_flags & B_ERROR)) {
979 struct aiocb *job = aiocbe->uuaiocb;
980
981 aiocbe->uaiocb._aiocb_private.status = 0;
982 suword(&job->_aiocb_private.status, 0);
983 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
984 suword(&job->_aiocb_private.error, bp->b_error);
985
986 ki->kaio_buffer_finished_count++;
987
988 if (aiocbe->jobstate != JOBST_JOBBFINISHED) {
989 aiocbe->jobstate = JOBST_JOBBFINISHED;
990 aiocbe->jobflags |= AIOCBLIST_DONE;
991 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list);
992 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist);
993 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist);
994 notify = 1;
995 }
996 }
997 #endif
998 crit_exit();
999 if (notify)
1000 KNOTE(&aiocbe->klist, 0);
1001 return 0;
1002
1003 doerror:
1004 ki->kaio_buffer_count--;
1005 if (lj)
1006 lj->lioj_buffer_count--;
1007 aiocbe->bp = NULL;
1008 relpbuf(bp, NULL);
1009 return error;
1010 }
1011
1012 /*
1013 * This waits/tests physio completion.
1014 */
1015 static int
1016 aio_fphysio(struct aiocblist *iocb)
1017 {
1018 struct buf *bp;
1019 int error;
1020
1021 bp = iocb->bp;
1022
1023 error = biowait_timeout(&bp->b_bio1, "physstr", aiod_timeout);
1024 if (error == EWOULDBLOCK)
1025 return EINPROGRESS;
1026
1027 /* Release mapping into kernel space. */
1028 vunmapbuf(bp);
1029 iocb->bp = 0;
1030
1031 error = 0;
1032
1033 /* Check for an error. */
1034 if (bp->b_flags & B_ERROR)
1035 error = bp->b_error;
1036
1037 relpbuf(bp, NULL);
1038 return (error);
1039 }
1040 #endif /* VFS_AIO */
1041
1042 /*
1043 * Wake up aio requests that may be serviceable now.
1044 */
1045 void
1046 aio_swake(struct socket *so, struct signalsockbuf *ssb)
1047 {
1048 #ifndef VFS_AIO
1049 return;
1050 #else
1051 struct aiocblist *cb,*cbn;
1052 struct proc *p;
1053 struct kaioinfo *ki = NULL;
1054 int opcode, wakecount = 0;
1055 struct aioproclist *aiop;
1056
1057 if (ssb == &so->so_snd) {
1058 opcode = LIO_WRITE;
1059 atomic_clear_int(&so->so_snd.ssb_flags, SSB_AIO);
1060 } else {
1061 opcode = LIO_READ;
1062 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_AIO);
1063 }
1064
1065 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) {
1066 cbn = TAILQ_NEXT(cb, list);
1067 if (opcode == cb->uaiocb.aio_lio_opcode) {
1068 p = cb->userproc;
1069 ki = p->p_aioinfo;
1070 TAILQ_REMOVE(&so->so_aiojobq, cb, list);
1071 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist);
1072 TAILQ_INSERT_TAIL(&aio_jobs, cb, list);
1073 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist);
1074 wakecount++;
1075 if (cb->jobstate != JOBST_JOBQGLOBAL)
1076 panic("invalid queue value");
1077 }
1078 }
1079
1080 while (wakecount--) {
1081 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) {
1082 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1083 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
1084 aiop->aioprocflags &= ~AIOP_FREE;
1085 wakeup(aiop->aioproc);
1086 }
1087 }
1088 #endif /* VFS_AIO */
1089 }
1090
1091 #ifdef VFS_AIO
1092 /*
1093 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR
1094 * technique is done in this code.
1095 */
1096 static int
1097 _aio_aqueue(struct aiocb *job, struct aio_liojob *lj, int type)
1098 {
1099 struct proc *p = curproc;
1100 struct file *fp;
1101 unsigned int fd;
1102 struct socket *so;
1103 int error;
1104 int opcode, user_opcode;
1105 struct aiocblist *aiocbe;
1106 struct aioproclist *aiop;
1107 struct kaioinfo *ki;
1108 struct kevent kev;
1109 struct kqueue *kq;
1110 struct file *kq_fp;
1111 int fflags;
1112
1113 if ((aiocbe = TAILQ_FIRST(&aio_freejobs)) != NULL)
1114 TAILQ_REMOVE(&aio_freejobs, aiocbe, list);
1115 else
1116 aiocbe = objcache_get(aiocb_oc, M_WAITOK);
1117
1118 aiocbe->inputcharge = 0;
1119 aiocbe->outputcharge = 0;
1120 callout_init(&aiocbe->timeout);
1121 SLIST_INIT(&aiocbe->klist);
1122
1123 suword(&job->_aiocb_private.status, -1);
1124 suword(&job->_aiocb_private.error, 0);
1125 suword(&job->_aiocb_private.kernelinfo, -1);
1126
1127 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb));
1128 if (error) {
1129 suword(&job->_aiocb_private.error, error);
1130 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1131 return error;
1132 }
1133 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL &&
1134 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) {
1135 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1136 return EINVAL;
1137 }
1138
1139 /* Save userspace address of the job info. */
1140 aiocbe->uuaiocb = job;
1141
1142 /* Get the opcode. */
1143 user_opcode = aiocbe->uaiocb.aio_lio_opcode;
1144 if (type != LIO_NOP)
1145 aiocbe->uaiocb.aio_lio_opcode = type;
1146 opcode = aiocbe->uaiocb.aio_lio_opcode;
1147
1148 /*
1149 * Range check file descriptor.
1150 */
1151 fflags = (opcode == LIO_WRITE) ? FWRITE : FREAD;
1152 fd = aiocbe->uaiocb.aio_fildes;
1153 fp = holdfp(p->p_fd, fd, fflags);
1154 if (fp == NULL) {
1155 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1156 if (type == 0)
1157 suword(&job->_aiocb_private.error, EBADF);
1158 return EBADF;
1159 }
1160
1161 aiocbe->fd_file = fp;
1162
1163 if (aiocbe->uaiocb.aio_offset == -1LL) {
1164 error = EINVAL;
1165 goto aqueue_fail;
1166 }
1167 error = suword(&job->_aiocb_private.kernelinfo, jobrefid);
1168 if (error) {
1169 error = EINVAL;
1170 goto aqueue_fail;
1171 }
1172 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid;
1173 if (jobrefid == LONG_MAX)
1174 jobrefid = 1;
1175 else
1176 jobrefid++;
1177
1178 if (opcode == LIO_NOP) {
1179 fdrop(fp);
1180 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
1181 if (type == 0) {
1182 suword(&job->_aiocb_private.error, 0);
1183 suword(&job->_aiocb_private.status, 0);
1184 suword(&job->_aiocb_private.kernelinfo, 0);
1185 }
1186 return 0;
1187 }
1188 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) {
1189 if (type == 0)
1190 suword(&job->_aiocb_private.status, 0);
1191 error = EINVAL;
1192 goto aqueue_fail;
1193 }
1194
1195 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) {
1196 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue;
1197 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sival_ptr;
1198 }
1199 else {
1200 /*
1201 * This method for requesting kevent-based notification won't
1202 * work on the alpha, since we're passing in a pointer
1203 * via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT-
1204 * based method instead.
1205 */
1206 if (user_opcode == LIO_NOP || user_opcode == LIO_READ ||
1207 user_opcode == LIO_WRITE)
1208 goto no_kqueue;
1209
1210 error = copyin((struct kevent *)(uintptr_t)user_opcode,
1211 &kev, sizeof(kev));
1212 if (error)
1213 goto aqueue_fail;
1214 }
1215 kq_fp = holdfp(p->p_fd, (int)kev.ident, -1);
1216 if (kq_fp == NULL || kq_fp->f_type != DTYPE_KQUEUE) {
1217 if (kq_fp) {
1218 fdrop(kq_fp);
1219 kq_fp = NULL;
1220 }
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 error = kqueue_register(kq, &kev);
1230 fdrop(kq_fp);
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 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AIO);
1267 else
1268 atomic_set_int(&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 * MPALMOSTSAFE
1360 */
1361 int
1362 sys_aio_return(struct aio_return_args *uap)
1363 {
1364 #ifndef VFS_AIO
1365 return (ENOSYS);
1366 #else
1367 struct proc *p = curproc;
1368 struct lwp *lp = curthread->td_lwp;
1369 long jobref;
1370 struct aiocblist *cb, *ncb;
1371 struct aiocb *ujob;
1372 struct kaioinfo *ki;
1373 int error;
1374
1375 ki = p->p_aioinfo;
1376 if (ki == NULL)
1377 return EINVAL;
1378
1379 ujob = uap->aiocbp;
1380
1381 jobref = fuword(&ujob->_aiocb_private.kernelinfo);
1382 if (jobref == -1 || jobref == 0)
1383 return EINVAL;
1384
1385 get_mplock();
1386 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1387 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) ==
1388 jobref) {
1389 if (ujob == cb->uuaiocb) {
1390 uap->sysmsg_result =
1391 cb->uaiocb._aiocb_private.status;
1392 } else {
1393 uap->sysmsg_result = EFAULT;
1394 }
1395 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
1396 lp->lwp_ru.ru_oublock += cb->outputcharge;
1397 cb->outputcharge = 0;
1398 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
1399 lp->lwp_ru.ru_inblock += cb->inputcharge;
1400 cb->inputcharge = 0;
1401 }
1402 aio_free_entry(cb);
1403 error = 0;
1404 goto done;
1405 }
1406 }
1407 crit_enter();
1408 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) {
1409 ncb = TAILQ_NEXT(cb, plist);
1410 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo)
1411 == jobref) {
1412 crit_exit();
1413 if (ujob == cb->uuaiocb) {
1414 uap->sysmsg_result =
1415 cb->uaiocb._aiocb_private.status;
1416 } else {
1417 uap->sysmsg_result = EFAULT;
1418 }
1419 aio_free_entry(cb);
1420 error = 0;
1421 goto done;
1422 }
1423 }
1424 crit_exit();
1425 error = EINVAL;
1426 done:
1427 rel_mplock();
1428 return (error);
1429 #endif /* VFS_AIO */
1430 }
1431
1432 /*
1433 * Allow a process to wakeup when any of the I/O requests are completed.
1434 *
1435 * MPALMOSTSAFE
1436 */
1437 int
1438 sys_aio_suspend(struct aio_suspend_args *uap)
1439 {
1440 #ifndef VFS_AIO
1441 return ENOSYS;
1442 #else
1443 struct proc *p = curproc;
1444 struct timeval atv;
1445 struct timespec ts;
1446 struct aiocb *const *cbptr, *cbp;
1447 struct kaioinfo *ki;
1448 struct aiocblist *cb;
1449 int i;
1450 int njoblist;
1451 int error, timo;
1452 long *ijoblist;
1453 struct aiocb **ujoblist;
1454
1455 if ((u_int)uap->nent > AIO_LISTIO_MAX)
1456 return EINVAL;
1457
1458 timo = 0;
1459 if (uap->timeout) {
1460 /* Get timespec struct. */
1461 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
1462 return error;
1463
1464 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
1465 return (EINVAL);
1466
1467 TIMESPEC_TO_TIMEVAL(&atv, &ts);
1468 if (itimerfix(&atv))
1469 return (EINVAL);
1470 timo = tvtohz_high(&atv);
1471 }
1472
1473 ki = p->p_aioinfo;
1474 if (ki == NULL)
1475 return EAGAIN;
1476
1477 get_mplock();
1478
1479 njoblist = 0;
1480 ijoblist = objcache_get(aiol_oc, M_WAITOK);
1481 ujoblist = objcache_get(aiol_oc, M_WAITOK);
1482 cbptr = uap->aiocbp;
1483
1484 for (i = 0; i < uap->nent; i++) {
1485 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
1486 if (cbp == 0)
1487 continue;
1488 ujoblist[njoblist] = cbp;
1489 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo);
1490 njoblist++;
1491 }
1492
1493 if (njoblist == 0) {
1494 objcache_put(aiol_oc, ijoblist);
1495 objcache_put(aiol_oc, ujoblist);
1496 error = 0;
1497 goto done;
1498 }
1499
1500 error = 0;
1501 for (;;) {
1502 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1503 for (i = 0; i < njoblist; i++) {
1504 if (((intptr_t)
1505 cb->uaiocb._aiocb_private.kernelinfo) ==
1506 ijoblist[i]) {
1507 if (ujoblist[i] != cb->uuaiocb)
1508 error = EINVAL;
1509 objcache_put(aiol_oc, ijoblist);
1510 objcache_put(aiol_oc, ujoblist);
1511 goto done;
1512 }
1513 }
1514 }
1515
1516 crit_enter();
1517 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb =
1518 TAILQ_NEXT(cb, plist)) {
1519 for (i = 0; i < njoblist; i++) {
1520 if (((intptr_t)
1521 cb->uaiocb._aiocb_private.kernelinfo) ==
1522 ijoblist[i]) {
1523 crit_exit();
1524 if (ujoblist[i] != cb->uuaiocb)
1525 error = EINVAL;
1526 objcache_put(aiol_oc, ijoblist);
1527 objcache_put(aiol_oc, ujoblist);
1528 goto done;
1529 }
1530 }
1531 }
1532
1533 ki->kaio_flags |= KAIO_WAKEUP;
1534 error = tsleep(p, PCATCH, "aiospn", timo);
1535 crit_exit();
1536
1537 if (error == ERESTART || error == EINTR) {
1538 objcache_put(aiol_oc, ijoblist);
1539 objcache_put(aiol_oc, ujoblist);
1540 error = EINTR;
1541 goto done;
1542 } else if (error == EWOULDBLOCK) {
1543 objcache_put(aiol_oc, ijoblist);
1544 objcache_put(aiol_oc, ujoblist);
1545 error = EAGAIN;
1546 goto done;
1547 }
1548 }
1549
1550 /* NOTREACHED */
1551 error = EINVAL;
1552 done:
1553 rel_mplock();
1554 return (error);
1555 #endif /* VFS_AIO */
1556 }
1557
1558 /*
1559 * aio_cancel cancels any non-physio aio operations not currently in
1560 * progress.
1561 *
1562 * MPALMOSTSAFE
1563 */
1564 int
1565 sys_aio_cancel(struct aio_cancel_args *uap)
1566 {
1567 #ifndef VFS_AIO
1568 return ENOSYS;
1569 #else
1570 struct proc *p = curproc;
1571 struct kaioinfo *ki;
1572 struct aiocblist *cbe, *cbn;
1573 struct file *fp;
1574 struct socket *so;
1575 struct proc *po;
1576 int error;
1577 int cancelled=0;
1578 int notcancelled=0;
1579 struct vnode *vp;
1580
1581 fp = holdfp(p->p_fd, uap->fd, -1);
1582 if (fp == NULL)
1583 return (EBADF);
1584
1585 get_mplock();
1586
1587 if (fp->f_type == DTYPE_VNODE) {
1588 vp = (struct vnode *)fp->f_data;
1589
1590 if (vn_isdisk(vp,&error)) {
1591 uap->sysmsg_result = AIO_NOTCANCELED;
1592 error = 0;
1593 goto done2;
1594 }
1595 } else if (fp->f_type == DTYPE_SOCKET) {
1596 so = (struct socket *)fp->f_data;
1597
1598 crit_enter();
1599
1600 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) {
1601 cbn = TAILQ_NEXT(cbe, list);
1602 if ((uap->aiocbp == NULL) ||
1603 (uap->aiocbp == cbe->uuaiocb) ) {
1604 po = cbe->userproc;
1605 ki = po->p_aioinfo;
1606 TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
1607 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist);
1608 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist);
1609 if (ki->kaio_flags & KAIO_WAKEUP) {
1610 wakeup(po);
1611 }
1612 cbe->jobstate = JOBST_JOBFINISHED;
1613 cbe->uaiocb._aiocb_private.status=-1;
1614 cbe->uaiocb._aiocb_private.error=ECANCELED;
1615 cancelled++;
1616 /* XXX cancelled, knote? */
1617 if (cbe->uaiocb.aio_sigevent.sigev_notify ==
1618 SIGEV_SIGNAL)
1619 ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
1620 if (uap->aiocbp)
1621 break;
1622 }
1623 }
1624 crit_exit();
1625
1626 if ((cancelled) && (uap->aiocbp)) {
1627 uap->sysmsg_result = AIO_CANCELED;
1628 error = 0;
1629 goto done2;
1630 }
1631 }
1632 ki=p->p_aioinfo;
1633 if (ki == NULL)
1634 goto done;
1635 crit_enter();
1636
1637 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) {
1638 cbn = TAILQ_NEXT(cbe, plist);
1639
1640 if ((uap->fd == cbe->uaiocb.aio_fildes) &&
1641 ((uap->aiocbp == NULL ) ||
1642 (uap->aiocbp == cbe->uuaiocb))) {
1643
1644 if (cbe->jobstate == JOBST_JOBQGLOBAL) {
1645 TAILQ_REMOVE(&aio_jobs, cbe, list);
1646 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
1647 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe,
1648 plist);
1649 cancelled++;
1650 ki->kaio_queue_finished_count++;
1651 cbe->jobstate = JOBST_JOBFINISHED;
1652 cbe->uaiocb._aiocb_private.status = -1;
1653 cbe->uaiocb._aiocb_private.error = ECANCELED;
1654 /* XXX cancelled, knote? */
1655 if (cbe->uaiocb.aio_sigevent.sigev_notify ==
1656 SIGEV_SIGNAL)
1657 ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
1658 } else {
1659 notcancelled++;
1660 }
1661 }
1662 }
1663 crit_exit();
1664 done:
1665 if (notcancelled)
1666 uap->sysmsg_result = AIO_NOTCANCELED;
1667 else if (cancelled)
1668 uap->sysmsg_result = AIO_CANCELED;
1669 else
1670 uap->sysmsg_result = AIO_ALLDONE;
1671 error = 0;
1672 done2:
1673 rel_mplock();
1674 fdrop(fp);
1675 return error;
1676 #endif /* VFS_AIO */
1677 }
1678
1679 /*
1680 * aio_error is implemented in the kernel level for compatibility purposes only.
1681 * For a user mode async implementation, it would be best to do it in a userland
1682 * subroutine.
1683 *
1684 * MPALMOSTSAFE
1685 */
1686 int
1687 sys_aio_error(struct aio_error_args *uap)
1688 {
1689 #ifndef VFS_AIO
1690 return ENOSYS;
1691 #else
1692 struct proc *p = curproc;
1693 struct aiocblist *cb;
1694 struct kaioinfo *ki;
1695 long jobref;
1696 int error;
1697
1698 ki = p->p_aioinfo;
1699 if (ki == NULL)
1700 return EINVAL;
1701
1702 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo);
1703 if ((jobref == -1) || (jobref == 0))
1704 return EINVAL;
1705
1706 get_mplock();
1707 error = 0;
1708
1709 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1710 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1711 jobref) {
1712 uap->sysmsg_result = cb->uaiocb._aiocb_private.error;
1713 goto done;
1714 }
1715 }
1716
1717 crit_enter();
1718
1719 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb,
1720 plist)) {
1721 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1722 jobref) {
1723 uap->sysmsg_result = EINPROGRESS;
1724 crit_exit();
1725 goto done;
1726 }
1727 }
1728
1729 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb,
1730 plist)) {
1731 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1732 jobref) {
1733 uap->sysmsg_result = EINPROGRESS;
1734 crit_exit();
1735 goto done;
1736 }
1737 }
1738 crit_exit();
1739
1740 crit_enter();
1741 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb,
1742 plist)) {
1743 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1744 jobref) {
1745 uap->sysmsg_result = cb->uaiocb._aiocb_private.error;
1746 crit_exit();
1747 goto done;
1748 }
1749 }
1750
1751 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb,
1752 plist)) {
1753 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
1754 jobref) {
1755 uap->sysmsg_result = EINPROGRESS;
1756 crit_exit();
1757 goto done;
1758 }
1759 }
1760 crit_exit();
1761 error = EINVAL;
1762 done:
1763 rel_mplock();
1764 return (error);
1765 #endif /* VFS_AIO */
1766 }
1767
1768 /*
1769 * syscall - asynchronous read from a file (REALTIME)
1770 *
1771 * MPALMOSTSAFE
1772 */
1773 int
1774 sys_aio_read(struct aio_read_args *uap)
1775 {
1776 #ifndef VFS_AIO
1777 return ENOSYS;
1778 #else
1779 int error;
1780
1781 get_mplock();
1782 error = aio_aqueue(uap->aiocbp, LIO_READ);
1783 rel_mplock();
1784 return (error);
1785 #endif /* VFS_AIO */
1786 }
1787
1788 /*
1789 * syscall - asynchronous write to a file (REALTIME)
1790 *
1791 * MPALMOSTSAFE
1792 */
1793 int
1794 sys_aio_write(struct aio_write_args *uap)
1795 {
1796 #ifndef VFS_AIO
1797 return ENOSYS;
1798 #else
1799 int error;
1800
1801 get_mplock();
1802 error = aio_aqueue(uap->aiocbp, LIO_WRITE);
1803 rel_mplock();
1804 return (error);
1805 #endif /* VFS_AIO */
1806 }
1807
1808 /*
1809 * syscall - XXX undocumented
1810 *
1811 * MPALMOSTSAFE
1812 */
1813 int
1814 sys_lio_listio(struct lio_listio_args *uap)
1815 {
1816 #ifndef VFS_AIO
1817 return ENOSYS;
1818 #else
1819 struct proc *p = curproc;
1820 struct lwp *lp = curthread->td_lwp;
1821 int nent, nentqueued;
1822 struct aiocb *iocb, * const *cbptr;
1823 struct aiocblist *cb;
1824 struct kaioinfo *ki;
1825 struct aio_liojob *lj;
1826 int error, runningcode;
1827 int nerror;
1828 int i;
1829
1830 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
1831 return EINVAL;
1832
1833 nent = uap->nent;
1834 if (nent > AIO_LISTIO_MAX)
1835 return EINVAL;
1836
1837 get_mplock();
1838
1839 if (p->p_aioinfo == NULL)
1840 aio_init_aioinfo(p);
1841
1842 if ((nent + num_queue_count) > max_queue_count) {
1843 error = EAGAIN;
1844 goto done;
1845 }
1846
1847 ki = p->p_aioinfo;
1848 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) {
1849 error = EAGAIN;
1850 goto done;
1851 }
1852
1853 lj = objcache_get(aiolio_oc);
1854 if (lj == NULL) {
1855 error = EAGAIN;
1856 goto done;
1857 }
1858
1859 lj->lioj_flags = 0;
1860 lj->lioj_buffer_count = 0;
1861 lj->lioj_buffer_finished_count = 0;
1862 lj->lioj_queue_count = 0;
1863 lj->lioj_queue_finished_count = 0;
1864 lj->lioj_ki = ki;
1865
1866 /*
1867 * Setup signal.
1868 */
1869 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
1870 error = copyin(uap->sig, &lj->lioj_signal,
1871 sizeof(lj->lioj_signal));
1872 if (error) {
1873 objcache_put(aiolio_oc, lj);
1874 goto done;
1875 }
1876 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
1877 objcache_put(aiolio_oc, lj);
1878 error = EINVAL;
1879 goto done;
1880 }
1881 lj->lioj_flags |= LIOJ_SIGNAL;
1882 lj->lioj_flags &= ~LIOJ_SIGNAL_POSTED;
1883 } else
1884 lj->lioj_flags &= ~LIOJ_SIGNAL;
1885
1886 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
1887 /*
1888 * Get pointers to the list of I/O requests.
1889 */
1890 nerror = 0;
1891 nentqueued = 0;
1892 cbptr = uap->acb_list;
1893 for (i = 0; i < uap->nent; i++) {
1894 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
1895 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) {
1896 error = _aio_aqueue(iocb, lj, 0);
1897 if (error == 0)
1898 nentqueued++;
1899 else
1900 nerror++;
1901 }
1902 }
1903
1904 /*
1905 * If we haven't queued any, then just return error.
1906 */
1907 if (nentqueued == 0) {
1908 error = 0;
1909 goto done;
1910 }
1911
1912 /*
1913 * Calculate the appropriate error return.
1914 */
1915 runningcode = 0;
1916 if (nerror)
1917 runningcode = EIO;
1918
1919 if (uap->mode == LIO_WAIT) {
1920 int command, found, jobref;
1921
1922 for (;;) {
1923 found = 0;
1924 for (i = 0; i < uap->nent; i++) {
1925 /*
1926 * Fetch address of the control buf pointer in
1927 * user space.
1928 */
1929 iocb = (struct aiocb *)
1930 (intptr_t)fuword(&cbptr[i]);
1931 if (((intptr_t)iocb == -1) || ((intptr_t)iocb
1932 == 0))
1933 continue;
1934
1935 /*
1936 * Fetch the associated command from user space.
1937 */
1938 command = fuword(&iocb->aio_lio_opcode);
1939 if (command == LIO_NOP) {
1940 found++;
1941 continue;
1942 }
1943
1944 jobref = fuword(&iocb->_aiocb_private.kernelinfo);
1945
1946 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
1947 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo)
1948 == jobref) {
1949 if (cb->uaiocb.aio_lio_opcode
1950 == LIO_WRITE) {
1951 lp->lwp_ru.ru_oublock +=
1952 cb->outputcharge;
1953 cb->outputcharge = 0;
1954 } else if (cb->uaiocb.aio_lio_opcode
1955 == LIO_READ) {
1956 lp->lwp_ru.ru_inblock +=
1957 cb->inputcharge;
1958 cb->inputcharge = 0;
1959 }
1960 found++;
1961 break;
1962 }
1963 }
1964
1965 crit_enter();
1966 TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) {
1967 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo)
1968 == jobref) {
1969 found++;
1970 break;
1971 }
1972 }
1973 crit_exit();
1974 }
1975
1976 /*
1977 * If all I/Os have been disposed of, then we can
1978 * return.
1979 */
1980 if (found == nentqueued) {
1981 error = runningcode;
1982 goto done;
1983 }
1984
1985 ki->kaio_flags |= KAIO_WAKEUP;
1986 error = tsleep(p, PCATCH, "aiospn", 0);
1987
1988 if (error == EINTR) {
1989 goto done;
1990 } else if (error == EWOULDBLOCK) {
1991 error = EAGAIN;
1992 goto done;
1993 }
1994 }
1995 }
1996
1997 error = runningcode;
1998 done:
1999 rel_mplock();
2000 return (error);
2001 #endif /* VFS_AIO */
2002 }
2003
2004 #ifdef VFS_AIO
2005 /*
2006 * This is a weird hack so that we can post a signal. It is safe to do so from
2007 * a timeout routine, but *not* from an interrupt routine.
2008 */
2009 static void
2010 process_signal(void *aioj)
2011 {
2012 struct aiocblist *aiocbe = aioj;
2013 struct aio_liojob *lj = aiocbe->lio;
2014 struct aiocb *cb = &aiocbe->uaiocb;
2015
2016 if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) &&
2017 (lj->lioj_queue_count == lj->lioj_queue_finished_count)) {
2018 ksignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo);
2019 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
2020 }
2021
2022 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL)
2023 ksignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo);
2024 }
2025
2026 /*
2027 * Interrupt handler for physio, performs the necessary process wakeups, and
2028 * signals.
2029 */
2030 static void
2031 aio_physwakeup(struct bio *bio)
2032 {
2033 struct buf *bp = bio->bio_buf;
2034 struct aiocblist *aiocbe;
2035 struct proc *p;
2036 struct kaioinfo *ki;
2037 struct aio_liojob *lj;
2038
2039 aiocbe = bio->bio_caller_info2.ptr;
2040 get_mplock();
2041
2042 if (aiocbe) {
2043 p = bio->bio_caller_info1.ptr;
2044
2045 aiocbe->jobstate = JOBST_JOBBFINISHED;
2046 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid;
2047 aiocbe->uaiocb._aiocb_private.error = 0;
2048 aiocbe->jobflags |= AIOCBLIST_DONE;
2049
2050 if (bp->b_flags & B_ERROR)
2051 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
2052
2053 lj = aiocbe->lio;
2054 if (lj) {
2055 lj->lioj_buffer_finished_count++;
2056
2057 /*
2058 * wakeup/signal if all of the interrupt jobs are done.
2059 */
2060 if (lj->lioj_buffer_finished_count ==
2061 lj->lioj_buffer_count) {
2062 /*
2063 * Post a signal if it is called for.
2064 */
2065 if ((lj->lioj_flags &
2066 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) ==
2067 LIOJ_SIGNAL) {
2068 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
2069 callout_reset(&aiocbe->timeout, 0,
2070 process_signal, aiocbe);
2071 }
2072 }
2073 }
2074
2075 ki = p->p_aioinfo;
2076 if (ki) {
2077 ki->kaio_buffer_finished_count++;
2078 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list);
2079 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist);
2080 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist);
2081
2082 KNOTE(&aiocbe->klist, 0);
2083 /* Do the wakeup. */
2084 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) {
2085 ki->kaio_flags &= ~KAIO_WAKEUP;
2086 wakeup(p);
2087 }
2088 }
2089
2090 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
2091 callout_reset(&aiocbe->timeout, 0,
2092 process_signal, aiocbe);
2093 }
2094 }
2095 biodone_sync(bio);
2096 rel_mplock();
2097 }
2098 #endif /* VFS_AIO */
2099
2100 /*
2101 * syscall - wait for the next completion of an aio request
2102 *
2103 * MPALMOSTSAFE
2104 */
2105 int
2106 sys_aio_waitcomplete(struct aio_waitcomplete_args *uap)
2107 {
2108 #ifndef VFS_AIO
2109 return ENOSYS;
2110 #else
2111 struct proc *p = curproc;
2112 struct lwp *lp = curthread->td_lwp;
2113 struct timeval atv;
2114 struct timespec ts;
2115 struct kaioinfo *ki;
2116 struct aiocblist *cb = NULL;
2117 int error, timo;
2118
2119 suword(uap->aiocbp, (int)NULL);
2120
2121 timo = 0;
2122 if (uap->timeout) {
2123 /* Get timespec struct. */
2124 error = copyin(uap->timeout, &ts, sizeof(ts));
2125 if (error)
2126 return error;
2127
2128 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000))
2129 return (EINVAL);
2130
2131 TIMESPEC_TO_TIMEVAL(&atv, &ts);
2132 if (itimerfix(&atv))
2133 return (EINVAL);
2134 timo = tvtohz_high(&atv);
2135 }
2136
2137 ki = p->p_aioinfo;
2138 if (ki == NULL)
2139 return EAGAIN;
2140
2141 get_mplock();
2142
2143 for (;;) {
2144 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) {
2145 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
2146 uap->sysmsg_result = cb->uaiocb._aiocb_private.status;
2147 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
2148 lp->lwp_ru.ru_oublock +=
2149 cb->outputcharge;
2150 cb->outputcharge = 0;
2151 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
2152 lp->lwp_ru.ru_inblock += cb->inputcharge;
2153 cb->inputcharge = 0;
2154 }
2155 aio_free_entry(cb);
2156 error = cb->uaiocb._aiocb_private.error;
2157 break;
2158 }
2159
2160 crit_enter();
2161 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) {
2162 crit_exit();
2163 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
2164 uap->sysmsg_result = cb->uaiocb._aiocb_private.status;
2165 aio_free_entry(cb);
2166 error = cb->uaiocb._aiocb_private.error;
2167 break;
2168 }
2169
2170 ki->kaio_flags |= KAIO_WAKEUP;
2171 error = tsleep(p, PCATCH, "aiowc", timo);
2172 crit_exit();
2173
2174 if (error == ERESTART) {
2175 error = EINTR;
2176 break;
2177 }
2178 if (error < 0)
2179 break;
2180 if (error == EINTR)
2181 break;
2182 if (error == EWOULDBLOCK) {
2183 error = EAGAIN;
2184 break;
2185 }
2186 }
2187 rel_mplock();
2188 return (error);
2189 #endif /* VFS_AIO */
2190 }
2191
2192 #ifndef VFS_AIO
2193 static int
2194 filt_aioattach(struct knote *kn)
2195 {
2196
2197 return (ENXIO);
2198 }
2199
2200 struct filterops aio_filtops =
2201 { 0, filt_aioattach, NULL, NULL };
2202
2203 #else
2204 /* kqueue attach function */
2205 static int
2206 filt_aioattach(struct knote *kn)
2207 {
2208 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2209
2210 /*
2211 * The aiocbe pointer must be validated before using it, so
2212 * registration is restricted to the kernel; the user cannot
2213 * set EV_FLAG1.
2214 */
2215 if ((kn->kn_flags & EV_FLAG1) == 0)
2216 return (EPERM);
2217 kn->kn_flags &= ~EV_FLAG1;
2218
2219 knote_insert(&aiocbe->klist, kn);
2220
2221 return (0);
2222 }
2223
2224 /* kqueue detach function */
2225 static void
2226 filt_aiodetach(struct knote *kn)
2227 {
2228 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2229
2230 knote_remove(&aiocbe->klist, kn);
2231 }
2232
2233 /* kqueue filter function */
2234 /*ARGSUSED*/
2235 static int
2236 filt_aio(struct knote *kn, long hint)
2237 {
2238 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2239
2240 kn->kn_data = aiocbe->uaiocb._aiocb_private.error;
2241 if (aiocbe->jobstate != JOBST_JOBFINISHED &&
2242 aiocbe->jobstate != JOBST_JOBBFINISHED)
2243 return (0);
2244 kn->kn_flags |= EV_EOF;
2245 return (1);
2246 }
2247
2248 struct filterops aio_filtops =
2249 { 0, filt_aioattach, filt_aiodetach, filt_aio };
2250 #endif /* VFS_AIO */
DragonFly BSD