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Ignore machine-check MSRs
[freebsd-src/fkvm-freebsd.git] / sys / kern / vfs_aio.c
blobe86ae2c9a903421f5d81eeff8d9a45dcf3821515
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
17 /*
18 * This file contains support for the POSIX 1003.1B AIO/LIO facility.
19 */
20
21 #include <sys/cdefs.h>
22 __FBSDID("$FreeBSD$");
23
24 #include <sys/param.h>
25 #include <sys/systm.h>
26 #include <sys/malloc.h>
27 #include <sys/bio.h>
28 #include <sys/buf.h>
29 #include <sys/eventhandler.h>
30 #include <sys/sysproto.h>
31 #include <sys/filedesc.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/kthread.h>
35 #include <sys/fcntl.h>
36 #include <sys/file.h>
37 #include <sys/limits.h>
38 #include <sys/lock.h>
39 #include <sys/mutex.h>
40 #include <sys/unistd.h>
41 #include <sys/posix4.h>
42 #include <sys/proc.h>
43 #include <sys/resourcevar.h>
44 #include <sys/signalvar.h>
45 #include <sys/protosw.h>
46 #include <sys/sema.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/syscall.h>
50 #include <sys/sysent.h>
51 #include <sys/sysctl.h>
52 #include <sys/sx.h>
53 #include <sys/taskqueue.h>
54 #include <sys/vnode.h>
55 #include <sys/conf.h>
56 #include <sys/event.h>
57 #include <sys/mount.h>
58
59 #include <machine/atomic.h>
60
61 #include <vm/vm.h>
62 #include <vm/vm_extern.h>
63 #include <vm/pmap.h>
64 #include <vm/vm_map.h>
65 #include <vm/vm_object.h>
66 #include <vm/uma.h>
67 #include <sys/aio.h>
68
69 #include "opt_vfs_aio.h"
70
71 /*
72 * Counter for allocating reference ids to new jobs. Wrapped to 1 on
73 * overflow. (XXX will be removed soon.)
74 */
75 static u_long jobrefid;
76
77 /*
78 * Counter for aio_fsync.
79 */
80 static uint64_t jobseqno;
81
82 #define JOBST_NULL 0
83 #define JOBST_JOBQSOCK 1
84 #define JOBST_JOBQGLOBAL 2
85 #define JOBST_JOBRUNNING 3
86 #define JOBST_JOBFINISHED 4
87 #define JOBST_JOBQBUF 5
88 #define JOBST_JOBQSYNC 6
89
90 #ifndef MAX_AIO_PER_PROC
91 #define MAX_AIO_PER_PROC 32
92 #endif
93
94 #ifndef MAX_AIO_QUEUE_PER_PROC
95 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */
96 #endif
97
98 #ifndef MAX_AIO_PROCS
99 #define MAX_AIO_PROCS 32
100 #endif
101
102 #ifndef MAX_AIO_QUEUE
103 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */
104 #endif
105
106 #ifndef TARGET_AIO_PROCS
107 #define TARGET_AIO_PROCS 4
108 #endif
109
110 #ifndef MAX_BUF_AIO
111 #define MAX_BUF_AIO 16
112 #endif
113
114 #ifndef AIOD_TIMEOUT_DEFAULT
115 #define AIOD_TIMEOUT_DEFAULT (10 * hz)
116 #endif
117
118 #ifndef AIOD_LIFETIME_DEFAULT
119 #define AIOD_LIFETIME_DEFAULT (30 * hz)
120 #endif
121
122 FEATURE(aio, "Asynchronous I/O");
123
124 static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management");
125
126 static int max_aio_procs = MAX_AIO_PROCS;
127 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs,
128 CTLFLAG_RW, &max_aio_procs, 0,
129 "Maximum number of kernel threads to use for handling async IO ");
130
131 static int num_aio_procs = 0;
132 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs,
133 CTLFLAG_RD, &num_aio_procs, 0,
134 "Number of presently active kernel threads for async IO");
135
136 /*
137 * The code will adjust the actual number of AIO processes towards this
138 * number when it gets a chance.
139 */
140 static int target_aio_procs = TARGET_AIO_PROCS;
141 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs,
142 0, "Preferred number of ready kernel threads for async IO");
143
144 static int max_queue_count = MAX_AIO_QUEUE;
145 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0,
146 "Maximum number of aio requests to queue, globally");
147
148 static int num_queue_count = 0;
149 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0,
150 "Number of queued aio requests");
151
152 static int num_buf_aio = 0;
153 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
154 "Number of aio requests presently handled by the buf subsystem");
155
156 /* Number of async I/O thread in the process of being started */
157 /* XXX This should be local to aio_aqueue() */
158 static int num_aio_resv_start = 0;
159
160 static int aiod_timeout;
161 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0,
162 "Timeout value for synchronous aio operations");
163
164 static int aiod_lifetime;
165 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0,
166 "Maximum lifetime for idle aiod");
167
168 static int unloadable = 0;
169 SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0,
170 "Allow unload of aio (not recommended)");
171
172
173 static int max_aio_per_proc = MAX_AIO_PER_PROC;
174 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
175 0, "Maximum active aio requests per process (stored in the process)");
176
177 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
178 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
179 &max_aio_queue_per_proc, 0,
180 "Maximum queued aio requests per process (stored in the process)");
181
182 static int max_buf_aio = MAX_BUF_AIO;
183 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
184 "Maximum buf aio requests per process (stored in the process)");
185
186 typedef struct oaiocb {
187 int aio_fildes; /* File descriptor */
188 off_t aio_offset; /* File offset for I/O */
189 volatile void *aio_buf; /* I/O buffer in process space */
190 size_t aio_nbytes; /* Number of bytes for I/O */
191 struct osigevent aio_sigevent; /* Signal to deliver */
192 int aio_lio_opcode; /* LIO opcode */
193 int aio_reqprio; /* Request priority -- ignored */
194 struct __aiocb_private _aiocb_private;
195 } oaiocb_t;
196
197 /*
198 * Below is a key of locks used to protect each member of struct aiocblist
199 * aioliojob and kaioinfo and any backends.
200 *
201 * * - need not protected
202 * a - locked by kaioinfo lock
203 * b - locked by backend lock, the backend lock can be null in some cases,
204 * for example, BIO belongs to this type, in this case, proc lock is
205 * reused.
206 * c - locked by aio_job_mtx, the lock for the generic file I/O backend.
207 */
208
209 /*
210 * Current, there is only two backends: BIO and generic file I/O.
211 * socket I/O is served by generic file I/O, this is not a good idea, since
212 * disk file I/O and any other types without O_NONBLOCK flag can block daemon
213 * threads, if there is no thread to serve socket I/O, the socket I/O will be
214 * delayed too long or starved, we should create some threads dedicated to
215 * sockets to do non-blocking I/O, same for pipe and fifo, for these I/O
216 * systems we really need non-blocking interface, fiddling O_NONBLOCK in file
217 * structure is not safe because there is race between userland and aio
218 * daemons.
219 */
220
221 struct aiocblist {
222 TAILQ_ENTRY(aiocblist) list; /* (b) internal list of for backend */
223 TAILQ_ENTRY(aiocblist) plist; /* (a) list of jobs for each backend */
224 TAILQ_ENTRY(aiocblist) allist; /* (a) list of all jobs in proc */
225 int jobflags; /* (a) job flags */
226 int jobstate; /* (b) job state */
227 int inputcharge; /* (*) input blockes */
228 int outputcharge; /* (*) output blockes */
229 struct buf *bp; /* (*) private to BIO backend,
230 * buffer pointer
231 */
232 struct proc *userproc; /* (*) user process */
233 struct ucred *cred; /* (*) active credential when created */
234 struct file *fd_file; /* (*) pointer to file structure */
235 struct aioliojob *lio; /* (*) optional lio job */
236 struct aiocb *uuaiocb; /* (*) pointer in userspace of aiocb */
237 struct knlist klist; /* (a) list of knotes */
238 struct aiocb uaiocb; /* (*) kernel I/O control block */
239 ksiginfo_t ksi; /* (a) realtime signal info */
240 struct task biotask; /* (*) private to BIO backend */
241 uint64_t seqno; /* (*) job number */
242 int pending; /* (a) number of pending I/O, aio_fsync only */
243 };
244
245 /* jobflags */
246 #define AIOCBLIST_DONE 0x01
247 #define AIOCBLIST_BUFDONE 0x02
248 #define AIOCBLIST_RUNDOWN 0x04
249 #define AIOCBLIST_CHECKSYNC 0x08
250
251 /*
252 * AIO process info
253 */
254 #define AIOP_FREE 0x1 /* proc on free queue */
255
256 struct aiothreadlist {
257 int aiothreadflags; /* (c) AIO proc flags */
258 TAILQ_ENTRY(aiothreadlist) list; /* (c) list of processes */
259 struct thread *aiothread; /* (*) the AIO thread */
260 };
261
262 /*
263 * data-structure for lio signal management
264 */
265 struct aioliojob {
266 int lioj_flags; /* (a) listio flags */
267 int lioj_count; /* (a) listio flags */
268 int lioj_finished_count; /* (a) listio flags */
269 struct sigevent lioj_signal; /* (a) signal on all I/O done */
270 TAILQ_ENTRY(aioliojob) lioj_list; /* (a) lio list */
271 struct knlist klist; /* (a) list of knotes */
272 ksiginfo_t lioj_ksi; /* (a) Realtime signal info */
273 };
274
275 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */
276 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */
277 #define LIOJ_KEVENT_POSTED 0x4 /* kevent triggered */
278
279 /*
280 * per process aio data structure
281 */
282 struct kaioinfo {
283 struct mtx kaio_mtx; /* the lock to protect this struct */
284 int kaio_flags; /* (a) per process kaio flags */
285 int kaio_maxactive_count; /* (*) maximum number of AIOs */
286 int kaio_active_count; /* (c) number of currently used AIOs */
287 int kaio_qallowed_count; /* (*) maxiumu size of AIO queue */
288 int kaio_count; /* (a) size of AIO queue */
289 int kaio_ballowed_count; /* (*) maximum number of buffers */
290 int kaio_buffer_count; /* (a) number of physio buffers */
291 TAILQ_HEAD(,aiocblist) kaio_all; /* (a) all AIOs in the process */
292 TAILQ_HEAD(,aiocblist) kaio_done; /* (a) done queue for process */
293 TAILQ_HEAD(,aioliojob) kaio_liojoblist; /* (a) list of lio jobs */
294 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* (a) job queue for process */
295 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* (a) buffer job queue for process */
296 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* (a) queue for aios waiting on sockets,
297 * NOT USED YET.
298 */
299 TAILQ_HEAD(,aiocblist) kaio_syncqueue; /* (a) queue for aio_fsync */
300 struct task kaio_task; /* (*) task to kick aio threads */
301 };
302
303 #define AIO_LOCK(ki) mtx_lock(&(ki)->kaio_mtx)
304 #define AIO_UNLOCK(ki) mtx_unlock(&(ki)->kaio_mtx)
305 #define AIO_LOCK_ASSERT(ki, f) mtx_assert(&(ki)->kaio_mtx, (f))
306 #define AIO_MTX(ki) (&(ki)->kaio_mtx)
307
308 #define KAIO_RUNDOWN 0x1 /* process is being run down */
309 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */
310
311 static TAILQ_HEAD(,aiothreadlist) aio_freeproc; /* (c) Idle daemons */
312 static struct sema aio_newproc_sem;
313 static struct mtx aio_job_mtx;
314 static struct mtx aio_sock_mtx;
315 static TAILQ_HEAD(,aiocblist) aio_jobs; /* (c) Async job list */
316 static struct unrhdr *aiod_unr;
317
318 void aio_init_aioinfo(struct proc *p);
319 static void aio_onceonly(void);
320 static int aio_free_entry(struct aiocblist *aiocbe);
321 static void aio_process(struct aiocblist *aiocbe);
322 static int aio_newproc(int *);
323 int aio_aqueue(struct thread *td, struct aiocb *job,
324 struct aioliojob *lio, int type, int osigev);
325 static void aio_physwakeup(struct buf *bp);
326 static void aio_proc_rundown(void *arg, struct proc *p);
327 static void aio_proc_rundown_exec(void *arg, struct proc *p, struct image_params *imgp);
328 static int aio_qphysio(struct proc *p, struct aiocblist *iocb);
329 static void biohelper(void *, int);
330 static void aio_daemon(void *param);
331 static void aio_swake_cb(struct socket *, struct sockbuf *);
332 static int aio_unload(void);
333 static void aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type);
334 #define DONE_BUF 1
335 #define DONE_QUEUE 2
336 static int do_lio_listio(struct thread *td, struct lio_listio_args *uap, int oldsigev);
337 static int aio_kick(struct proc *userp);
338 static void aio_kick_nowait(struct proc *userp);
339 static void aio_kick_helper(void *context, int pending);
340 static int filt_aioattach(struct knote *kn);
341 static void filt_aiodetach(struct knote *kn);
342 static int filt_aio(struct knote *kn, long hint);
343 static int filt_lioattach(struct knote *kn);
344 static void filt_liodetach(struct knote *kn);
345 static int filt_lio(struct knote *kn, long hint);
346
347 /*
348 * Zones for:
349 * kaio Per process async io info
350 * aiop async io thread data
351 * aiocb async io jobs
352 * aiol list io job pointer - internal to aio_suspend XXX
353 * aiolio list io jobs
354 */
355 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone;
356
357 /* kqueue filters for aio */
358 static struct filterops aio_filtops =
359 { 0, filt_aioattach, filt_aiodetach, filt_aio };
360 static struct filterops lio_filtops =
361 { 0, filt_lioattach, filt_liodetach, filt_lio };
362
363 static eventhandler_tag exit_tag, exec_tag;
364
365 TASKQUEUE_DEFINE_THREAD(aiod_bio);
366
367 /*
368 * Main operations function for use as a kernel module.
369 */
370 static int
371 aio_modload(struct module *module, int cmd, void *arg)
372 {
373 int error = 0;
374
375 switch (cmd) {
376 case MOD_LOAD:
377 aio_onceonly();
378 break;
379 case MOD_UNLOAD:
380 error = aio_unload();
381 break;
382 case MOD_SHUTDOWN:
383 break;
384 default:
385 error = EINVAL;
386 break;
387 }
388 return (error);
389 }
390
391 static moduledata_t aio_mod = {
392 "aio",
393 &aio_modload,
394 NULL
395 };
396
397 SYSCALL_MODULE_HELPER(aio_cancel);
398 SYSCALL_MODULE_HELPER(aio_error);
399 SYSCALL_MODULE_HELPER(aio_fsync);
400 SYSCALL_MODULE_HELPER(aio_read);
401 SYSCALL_MODULE_HELPER(aio_return);
402 SYSCALL_MODULE_HELPER(aio_suspend);
403 SYSCALL_MODULE_HELPER(aio_waitcomplete);
404 SYSCALL_MODULE_HELPER(aio_write);
405 SYSCALL_MODULE_HELPER(lio_listio);
406 SYSCALL_MODULE_HELPER(oaio_read);
407 SYSCALL_MODULE_HELPER(oaio_write);
408 SYSCALL_MODULE_HELPER(olio_listio);
409
410 DECLARE_MODULE(aio, aio_mod,
411 SI_SUB_VFS, SI_ORDER_ANY);
412 MODULE_VERSION(aio, 1);
413
414 /*
415 * Startup initialization
416 */
417 static void
418 aio_onceonly(void)
419 {
420
421 /* XXX: should probably just use so->callback */
422 aio_swake = &aio_swake_cb;
423 exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL,
424 EVENTHANDLER_PRI_ANY);
425 exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown_exec, NULL,
426 EVENTHANDLER_PRI_ANY);
427 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops);
428 kqueue_add_filteropts(EVFILT_LIO, &lio_filtops);
429 TAILQ_INIT(&aio_freeproc);
430 sema_init(&aio_newproc_sem, 0, "aio_new_proc");
431 mtx_init(&aio_job_mtx, "aio_job", NULL, MTX_DEF);
432 mtx_init(&aio_sock_mtx, "aio_sock", NULL, MTX_DEF);
433 TAILQ_INIT(&aio_jobs);
434 aiod_unr = new_unrhdr(1, INT_MAX, NULL);
435 kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL,
436 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
437 aiop_zone = uma_zcreate("AIOP", sizeof(struct aiothreadlist), NULL,
438 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
439 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct aiocblist), NULL, NULL,
440 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
441 aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL,
442 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
443 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL,
444 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
445 aiod_timeout = AIOD_TIMEOUT_DEFAULT;
446 aiod_lifetime = AIOD_LIFETIME_DEFAULT;
447 jobrefid = 1;
448 async_io_version = _POSIX_VERSION;
449 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX);
450 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE);
451 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0);
452 }
453
454 /*
455 * Callback for unload of AIO when used as a module.
456 */
457 static int
458 aio_unload(void)
459 {
460 int error;
461
462 /*
463 * XXX: no unloads by default, it's too dangerous.
464 * perhaps we could do it if locked out callers and then
465 * did an aio_proc_rundown() on each process.
466 *
467 * jhb: aio_proc_rundown() needs to run on curproc though,
468 * so I don't think that would fly.
469 */
470 if (!unloadable)
471 return (EOPNOTSUPP);
472
473 error = kqueue_del_filteropts(EVFILT_AIO);
474 if (error)
475 return error;
476 error = kqueue_del_filteropts(EVFILT_LIO);
477 if (error)
478 return error;
479 async_io_version = 0;
480 aio_swake = NULL;
481 taskqueue_free(taskqueue_aiod_bio);
482 delete_unrhdr(aiod_unr);
483 uma_zdestroy(kaio_zone);
484 uma_zdestroy(aiop_zone);
485 uma_zdestroy(aiocb_zone);
486 uma_zdestroy(aiol_zone);
487 uma_zdestroy(aiolio_zone);
488 EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
489 EVENTHANDLER_DEREGISTER(process_exec, exec_tag);
490 mtx_destroy(&aio_job_mtx);
491 mtx_destroy(&aio_sock_mtx);
492 sema_destroy(&aio_newproc_sem);
493 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, -1);
494 p31b_setcfg(CTL_P1003_1B_AIO_MAX, -1);
495 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, -1);
496 return (0);
497 }
498
499 /*
500 * Init the per-process aioinfo structure. The aioinfo limits are set
501 * per-process for user limit (resource) management.
502 */
503 void
504 aio_init_aioinfo(struct proc *p)
505 {
506 struct kaioinfo *ki;
507
508 ki = uma_zalloc(kaio_zone, M_WAITOK);
509 mtx_init(&ki->kaio_mtx, "aiomtx", NULL, MTX_DEF);
510 ki->kaio_flags = 0;
511 ki->kaio_maxactive_count = max_aio_per_proc;
512 ki->kaio_active_count = 0;
513 ki->kaio_qallowed_count = max_aio_queue_per_proc;
514 ki->kaio_count = 0;
515 ki->kaio_ballowed_count = max_buf_aio;
516 ki->kaio_buffer_count = 0;
517 TAILQ_INIT(&ki->kaio_all);
518 TAILQ_INIT(&ki->kaio_done);
519 TAILQ_INIT(&ki->kaio_jobqueue);
520 TAILQ_INIT(&ki->kaio_bufqueue);
521 TAILQ_INIT(&ki->kaio_liojoblist);
522 TAILQ_INIT(&ki->kaio_sockqueue);
523 TAILQ_INIT(&ki->kaio_syncqueue);
524 TASK_INIT(&ki->kaio_task, 0, aio_kick_helper, p);
525 PROC_LOCK(p);
526 if (p->p_aioinfo == NULL) {
527 p->p_aioinfo = ki;
528 PROC_UNLOCK(p);
529 } else {
530 PROC_UNLOCK(p);
531 mtx_destroy(&ki->kaio_mtx);
532 uma_zfree(kaio_zone, ki);
533 }
534
535 while (num_aio_procs < MIN(target_aio_procs, max_aio_procs))
536 aio_newproc(NULL);
537 }
538
539 static int
540 aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi)
541 {
542 int ret = 0;
543
544 PROC_LOCK(p);
545 if (!KSI_ONQ(ksi)) {
546 ksi->ksi_code = SI_ASYNCIO;
547 ksi->ksi_flags |= KSI_EXT | KSI_INS;
548 ret = psignal_event(p, sigev, ksi);
549 }
550 PROC_UNLOCK(p);
551 return (ret);
552 }
553
554 /*
555 * Free a job entry. Wait for completion if it is currently active, but don't
556 * delay forever. If we delay, we return a flag that says that we have to
557 * restart the queue scan.
558 */
559 static int
560 aio_free_entry(struct aiocblist *aiocbe)
561 {
562 struct kaioinfo *ki;
563 struct aioliojob *lj;
564 struct proc *p;
565
566 p = aiocbe->userproc;
567 MPASS(curproc == p);
568 ki = p->p_aioinfo;
569 MPASS(ki != NULL);
570
571 AIO_LOCK_ASSERT(ki, MA_OWNED);
572 MPASS(aiocbe->jobstate == JOBST_JOBFINISHED);
573
574 atomic_subtract_int(&num_queue_count, 1);
575
576 ki->kaio_count--;
577 MPASS(ki->kaio_count >= 0);
578
579 TAILQ_REMOVE(&ki->kaio_done, aiocbe, plist);
580 TAILQ_REMOVE(&ki->kaio_all, aiocbe, allist);
581
582 lj = aiocbe->lio;
583 if (lj) {
584 lj->lioj_count--;
585 lj->lioj_finished_count--;
586
587 if (lj->lioj_count == 0) {
588 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
589 /* lio is going away, we need to destroy any knotes */
590 knlist_delete(&lj->klist, curthread, 1);
591 PROC_LOCK(p);
592 sigqueue_take(&lj->lioj_ksi);
593 PROC_UNLOCK(p);
594 uma_zfree(aiolio_zone, lj);
595 }
596 }
597
598 /* aiocbe is going away, we need to destroy any knotes */
599 knlist_delete(&aiocbe->klist, curthread, 1);
600 PROC_LOCK(p);
601 sigqueue_take(&aiocbe->ksi);
602 PROC_UNLOCK(p);
603
604 MPASS(aiocbe->bp == NULL);
605 aiocbe->jobstate = JOBST_NULL;
606 AIO_UNLOCK(ki);
607
608 /*
609 * The thread argument here is used to find the owning process
610 * and is also passed to fo_close() which may pass it to various
611 * places such as devsw close() routines. Because of that, we
612 * need a thread pointer from the process owning the job that is
613 * persistent and won't disappear out from under us or move to
614 * another process.
615 *
616 * Currently, all the callers of this function call it to remove
617 * an aiocblist from the current process' job list either via a
618 * syscall or due to the current process calling exit() or
619 * execve(). Thus, we know that p == curproc. We also know that
620 * curthread can't exit since we are curthread.
621 *
622 * Therefore, we use curthread as the thread to pass to
623 * knlist_delete(). This does mean that it is possible for the
624 * thread pointer at close time to differ from the thread pointer
625 * at open time, but this is already true of file descriptors in
626 * a multithreaded process.
627 */
628 fdrop(aiocbe->fd_file, curthread);
629 crfree(aiocbe->cred);
630 uma_zfree(aiocb_zone, aiocbe);
631 AIO_LOCK(ki);
632
633 return (0);
634 }
635
636 static void
637 aio_proc_rundown_exec(void *arg, struct proc *p, struct image_params *imgp __unused)
638 {
639 aio_proc_rundown(arg, p);
640 }
641
642 /*
643 * Rundown the jobs for a given process.
644 */
645 static void
646 aio_proc_rundown(void *arg, struct proc *p)
647 {
648 struct kaioinfo *ki;
649 struct aioliojob *lj;
650 struct aiocblist *cbe, *cbn;
651 struct file *fp;
652 struct socket *so;
653 int remove;
654
655 KASSERT(curthread->td_proc == p,
656 ("%s: called on non-curproc", __func__));
657 ki = p->p_aioinfo;
658 if (ki == NULL)
659 return;
660
661 AIO_LOCK(ki);
662 ki->kaio_flags |= KAIO_RUNDOWN;
663
664 restart:
665
666 /*
667 * Try to cancel all pending requests. This code simulates
668 * aio_cancel on all pending I/O requests.
669 */
670 TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) {
671 remove = 0;
672 mtx_lock(&aio_job_mtx);
673 if (cbe->jobstate == JOBST_JOBQGLOBAL) {
674 TAILQ_REMOVE(&aio_jobs, cbe, list);
675 remove = 1;
676 } else if (cbe->jobstate == JOBST_JOBQSOCK) {
677 fp = cbe->fd_file;
678 MPASS(fp->f_type == DTYPE_SOCKET);
679 so = fp->f_data;
680 TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
681 remove = 1;
682 } else if (cbe->jobstate == JOBST_JOBQSYNC) {
683 TAILQ_REMOVE(&ki->kaio_syncqueue, cbe, list);
684 remove = 1;
685 }
686 mtx_unlock(&aio_job_mtx);
687
688 if (remove) {
689 cbe->jobstate = JOBST_JOBFINISHED;
690 cbe->uaiocb._aiocb_private.status = -1;
691 cbe->uaiocb._aiocb_private.error = ECANCELED;
692 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
693 aio_bio_done_notify(p, cbe, DONE_QUEUE);
694 }
695 }
696
697 /* Wait for all running I/O to be finished */
698 if (TAILQ_FIRST(&ki->kaio_bufqueue) ||
699 TAILQ_FIRST(&ki->kaio_jobqueue)) {
700 ki->kaio_flags |= KAIO_WAKEUP;
701 msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO, "aioprn", hz);
702 goto restart;
703 }
704
705 /* Free all completed I/O requests. */
706 while ((cbe = TAILQ_FIRST(&ki->kaio_done)) != NULL)
707 aio_free_entry(cbe);
708
709 while ((lj = TAILQ_FIRST(&ki->kaio_liojoblist)) != NULL) {
710 if (lj->lioj_count == 0) {
711 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
712 knlist_delete(&lj->klist, curthread, 1);
713 PROC_LOCK(p);
714 sigqueue_take(&lj->lioj_ksi);
715 PROC_UNLOCK(p);
716 uma_zfree(aiolio_zone, lj);
717 } else {
718 panic("LIO job not cleaned up: C:%d, FC:%d\n",
719 lj->lioj_count, lj->lioj_finished_count);
720 }
721 }
722 AIO_UNLOCK(ki);
723 taskqueue_drain(taskqueue_aiod_bio, &ki->kaio_task);
724 mtx_destroy(&ki->kaio_mtx);
725 uma_zfree(kaio_zone, ki);
726 p->p_aioinfo = NULL;
727 }
728
729 /*
730 * Select a job to run (called by an AIO daemon).
731 */
732 static struct aiocblist *
733 aio_selectjob(struct aiothreadlist *aiop)
734 {
735 struct aiocblist *aiocbe;
736 struct kaioinfo *ki;
737 struct proc *userp;
738
739 mtx_assert(&aio_job_mtx, MA_OWNED);
740 TAILQ_FOREACH(aiocbe, &aio_jobs, list) {
741 userp = aiocbe->userproc;
742 ki = userp->p_aioinfo;
743
744 if (ki->kaio_active_count < ki->kaio_maxactive_count) {
745 TAILQ_REMOVE(&aio_jobs, aiocbe, list);
746 /* Account for currently active jobs. */
747 ki->kaio_active_count++;
748 aiocbe->jobstate = JOBST_JOBRUNNING;
749 break;
750 }
751 }
752 return (aiocbe);
753 }
754
755 /*
756 * Move all data to a permanent storage device, this code
757 * simulates fsync syscall.
758 */
759 static int
760 aio_fsync_vnode(struct thread *td, struct vnode *vp)
761 {
762 struct mount *mp;
763 int vfslocked;
764 int error;
765
766 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
767 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
768 goto drop;
769 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
770 if (vp->v_object != NULL) {
771 VM_OBJECT_LOCK(vp->v_object);
772 vm_object_page_clean(vp->v_object, 0, 0, 0);
773 VM_OBJECT_UNLOCK(vp->v_object);
774 }
775 error = VOP_FSYNC(vp, MNT_WAIT, td);
776
777 VOP_UNLOCK(vp, 0);
778 vn_finished_write(mp);
779 drop:
780 VFS_UNLOCK_GIANT(vfslocked);
781 return (error);
782 }
783
784 /*
785 * The AIO processing activity. This is the code that does the I/O request for
786 * the non-physio version of the operations. The normal vn operations are used,
787 * and this code should work in all instances for every type of file, including
788 * pipes, sockets, fifos, and regular files.
789 *
790 * XXX I don't think it works well for socket, pipe, and fifo.
791 */
792 static void
793 aio_process(struct aiocblist *aiocbe)
794 {
795 struct ucred *td_savedcred;
796 struct thread *td;
797 struct aiocb *cb;
798 struct file *fp;
799 struct socket *so;
800 struct uio auio;
801 struct iovec aiov;
802 int cnt;
803 int error;
804 int oublock_st, oublock_end;
805 int inblock_st, inblock_end;
806
807 td = curthread;
808 td_savedcred = td->td_ucred;
809 td->td_ucred = aiocbe->cred;
810 cb = &aiocbe->uaiocb;
811 fp = aiocbe->fd_file;
812
813 if (cb->aio_lio_opcode == LIO_SYNC) {
814 error = 0;
815 cnt = 0;
816 if (fp->f_vnode != NULL)
817 error = aio_fsync_vnode(td, fp->f_vnode);
818 cb->_aiocb_private.error = error;
819 cb->_aiocb_private.status = 0;
820 td->td_ucred = td_savedcred;
821 return;
822 }
823
824 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
825 aiov.iov_len = cb->aio_nbytes;
826
827 auio.uio_iov = &aiov;
828 auio.uio_iovcnt = 1;
829 auio.uio_offset = cb->aio_offset;
830 auio.uio_resid = cb->aio_nbytes;
831 cnt = cb->aio_nbytes;
832 auio.uio_segflg = UIO_USERSPACE;
833 auio.uio_td = td;
834
835 inblock_st = td->td_ru.ru_inblock;
836 oublock_st = td->td_ru.ru_oublock;
837 /*
838 * aio_aqueue() acquires a reference to the file that is
839 * released in aio_free_entry().
840 */
841 if (cb->aio_lio_opcode == LIO_READ) {
842 auio.uio_rw = UIO_READ;
843 if (auio.uio_resid == 0)
844 error = 0;
845 else
846 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td);
847 } else {
848 if (fp->f_type == DTYPE_VNODE)
849 bwillwrite();
850 auio.uio_rw = UIO_WRITE;
851 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td);
852 }
853 inblock_end = td->td_ru.ru_inblock;
854 oublock_end = td->td_ru.ru_oublock;
855
856 aiocbe->inputcharge = inblock_end - inblock_st;
857 aiocbe->outputcharge = oublock_end - oublock_st;
858
859 if ((error) && (auio.uio_resid != cnt)) {
860 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
861 error = 0;
862 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) {
863 int sigpipe = 1;
864 if (fp->f_type == DTYPE_SOCKET) {
865 so = fp->f_data;
866 if (so->so_options & SO_NOSIGPIPE)
867 sigpipe = 0;
868 }
869 if (sigpipe) {
870 PROC_LOCK(aiocbe->userproc);
871 psignal(aiocbe->userproc, SIGPIPE);
872 PROC_UNLOCK(aiocbe->userproc);
873 }
874 }
875 }
876
877 cnt -= auio.uio_resid;
878 cb->_aiocb_private.error = error;
879 cb->_aiocb_private.status = cnt;
880 td->td_ucred = td_savedcred;
881 }
882
883 static void
884 aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type)
885 {
886 struct aioliojob *lj;
887 struct kaioinfo *ki;
888 struct aiocblist *scb, *scbn;
889 int lj_done;
890
891 ki = userp->p_aioinfo;
892 AIO_LOCK_ASSERT(ki, MA_OWNED);
893 lj = aiocbe->lio;
894 lj_done = 0;
895 if (lj) {
896 lj->lioj_finished_count++;
897 if (lj->lioj_count == lj->lioj_finished_count)
898 lj_done = 1;
899 }
900 if (type == DONE_QUEUE) {
901 aiocbe->jobflags |= AIOCBLIST_DONE;
902 } else {
903 aiocbe->jobflags |= AIOCBLIST_BUFDONE;
904 }
905 TAILQ_INSERT_TAIL(&ki->kaio_done, aiocbe, plist);
906 aiocbe->jobstate = JOBST_JOBFINISHED;
907
908 if (ki->kaio_flags & KAIO_RUNDOWN)
909 goto notification_done;
910
911 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
912 aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID)
913 aio_sendsig(userp, &aiocbe->uaiocb.aio_sigevent, &aiocbe->ksi);
914
915 KNOTE_LOCKED(&aiocbe->klist, 1);
916
917 if (lj_done) {
918 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
919 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
920 KNOTE_LOCKED(&lj->klist, 1);
921 }
922 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
923 == LIOJ_SIGNAL
924 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
925 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
926 aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi);
927 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
928 }
929 }
930
931 notification_done:
932 if (aiocbe->jobflags & AIOCBLIST_CHECKSYNC) {
933 TAILQ_FOREACH_SAFE(scb, &ki->kaio_syncqueue, list, scbn) {
934 if (aiocbe->fd_file == scb->fd_file &&
935 aiocbe->seqno < scb->seqno) {
936 if (--scb->pending == 0) {
937 mtx_lock(&aio_job_mtx);
938 scb->jobstate = JOBST_JOBQGLOBAL;
939 TAILQ_REMOVE(&ki->kaio_syncqueue, scb, list);
940 TAILQ_INSERT_TAIL(&aio_jobs, scb, list);
941 aio_kick_nowait(userp);
942 mtx_unlock(&aio_job_mtx);
943 }
944 }
945 }
946 }
947 if (ki->kaio_flags & KAIO_WAKEUP) {
948 ki->kaio_flags &= ~KAIO_WAKEUP;
949 wakeup(&userp->p_aioinfo);
950 }
951 }
952
953 /*
954 * The AIO daemon, most of the actual work is done in aio_process,
955 * but the setup (and address space mgmt) is done in this routine.
956 */
957 static void
958 aio_daemon(void *_id)
959 {
960 struct aiocblist *aiocbe;
961 struct aiothreadlist *aiop;
962 struct kaioinfo *ki;
963 struct proc *curcp, *mycp, *userp;
964 struct vmspace *myvm, *tmpvm;
965 struct thread *td = curthread;
966 int id = (intptr_t)_id;
967
968 /*
969 * Local copies of curproc (cp) and vmspace (myvm)
970 */
971 mycp = td->td_proc;
972 myvm = mycp->p_vmspace;
973
974 KASSERT(mycp->p_textvp == NULL, ("kthread has a textvp"));
975
976 /*
977 * Allocate and ready the aio control info. There is one aiop structure
978 * per daemon.
979 */
980 aiop = uma_zalloc(aiop_zone, M_WAITOK);
981 aiop->aiothread = td;
982 aiop->aiothreadflags = 0;
983
984 /* The daemon resides in its own pgrp. */
985 setsid(td, NULL);
986
987 /*
988 * Wakeup parent process. (Parent sleeps to keep from blasting away
989 * and creating too many daemons.)
990 */
991 sema_post(&aio_newproc_sem);
992
993 mtx_lock(&aio_job_mtx);
994 for (;;) {
995 /*
996 * curcp is the current daemon process context.
997 * userp is the current user process context.
998 */
999 curcp = mycp;
1000
1001 /*
1002 * Take daemon off of free queue
1003 */
1004 if (aiop->aiothreadflags & AIOP_FREE) {
1005 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1006 aiop->aiothreadflags &= ~AIOP_FREE;
1007 }
1008
1009 /*
1010 * Check for jobs.
1011 */
1012 while ((aiocbe = aio_selectjob(aiop)) != NULL) {
1013 mtx_unlock(&aio_job_mtx);
1014 userp = aiocbe->userproc;
1015
1016 /*
1017 * Connect to process address space for user program.
1018 */
1019 if (userp != curcp) {
1020 /*
1021 * Save the current address space that we are
1022 * connected to.
1023 */
1024 tmpvm = mycp->p_vmspace;
1025
1026 /*
1027 * Point to the new user address space, and
1028 * refer to it.
1029 */
1030 mycp->p_vmspace = userp->p_vmspace;
1031 atomic_add_int(&mycp->p_vmspace->vm_refcnt, 1);
1032
1033 /* Activate the new mapping. */
1034 pmap_activate(FIRST_THREAD_IN_PROC(mycp));
1035
1036 /*
1037 * If the old address space wasn't the daemons
1038 * own address space, then we need to remove the
1039 * daemon's reference from the other process
1040 * that it was acting on behalf of.
1041 */
1042 if (tmpvm != myvm) {
1043 vmspace_free(tmpvm);
1044 }
1045 curcp = userp;
1046 }
1047
1048 ki = userp->p_aioinfo;
1049
1050 /* Do the I/O function. */
1051 aio_process(aiocbe);
1052
1053 mtx_lock(&aio_job_mtx);
1054 /* Decrement the active job count. */
1055 ki->kaio_active_count--;
1056 mtx_unlock(&aio_job_mtx);
1057
1058 AIO_LOCK(ki);
1059 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
1060 aio_bio_done_notify(userp, aiocbe, DONE_QUEUE);
1061 AIO_UNLOCK(ki);
1062
1063 mtx_lock(&aio_job_mtx);
1064 }
1065
1066 /*
1067 * Disconnect from user address space.
1068 */
1069 if (curcp != mycp) {
1070
1071 mtx_unlock(&aio_job_mtx);
1072
1073 /* Get the user address space to disconnect from. */
1074 tmpvm = mycp->p_vmspace;
1075
1076 /* Get original address space for daemon. */
1077 mycp->p_vmspace = myvm;
1078
1079 /* Activate the daemon's address space. */
1080 pmap_activate(FIRST_THREAD_IN_PROC(mycp));
1081 #ifdef DIAGNOSTIC
1082 if (tmpvm == myvm) {
1083 printf("AIOD: vmspace problem -- %d\n",
1084 mycp->p_pid);
1085 }
1086 #endif
1087 /* Remove our vmspace reference. */
1088 vmspace_free(tmpvm);
1089
1090 curcp = mycp;
1091
1092 mtx_lock(&aio_job_mtx);
1093 /*
1094 * We have to restart to avoid race, we only sleep if
1095 * no job can be selected, that should be
1096 * curcp == mycp.
1097 */
1098 continue;
1099 }
1100
1101 mtx_assert(&aio_job_mtx, MA_OWNED);
1102
1103 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
1104 aiop->aiothreadflags |= AIOP_FREE;
1105
1106 /*
1107 * If daemon is inactive for a long time, allow it to exit,
1108 * thereby freeing resources.
1109 */
1110 if (msleep(aiop->aiothread, &aio_job_mtx, PRIBIO, "aiordy",
1111 aiod_lifetime)) {
1112 if (TAILQ_EMPTY(&aio_jobs)) {
1113 if ((aiop->aiothreadflags & AIOP_FREE) &&
1114 (num_aio_procs > target_aio_procs)) {
1115 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1116 num_aio_procs--;
1117 mtx_unlock(&aio_job_mtx);
1118 uma_zfree(aiop_zone, aiop);
1119 free_unr(aiod_unr, id);
1120 #ifdef DIAGNOSTIC
1121 if (mycp->p_vmspace->vm_refcnt <= 1) {
1122 printf("AIOD: bad vm refcnt for"
1123 " exiting daemon: %d\n",
1124 mycp->p_vmspace->vm_refcnt);
1125 }
1126 #endif
1127 kproc_exit(0);
1128 }
1129 }
1130 }
1131 }
1132 mtx_unlock(&aio_job_mtx);
1133 panic("shouldn't be here\n");
1134 }
1135
1136 /*
1137 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
1138 * AIO daemon modifies its environment itself.
1139 */
1140 static int
1141 aio_newproc(int *start)
1142 {
1143 int error;
1144 struct proc *p;
1145 int id;
1146
1147 id = alloc_unr(aiod_unr);
1148 error = kproc_create(aio_daemon, (void *)(intptr_t)id, &p,
1149 RFNOWAIT, 0, "aiod%d", id);
1150 if (error == 0) {
1151 /*
1152 * Wait until daemon is started.
1153 */
1154 sema_wait(&aio_newproc_sem);
1155 mtx_lock(&aio_job_mtx);
1156 num_aio_procs++;
1157 if (start != NULL)
1158 (*start)--;
1159 mtx_unlock(&aio_job_mtx);
1160 } else {
1161 free_unr(aiod_unr, id);
1162 }
1163 return (error);
1164 }
1165
1166 /*
1167 * Try the high-performance, low-overhead physio method for eligible
1168 * VCHR devices. This method doesn't use an aio helper thread, and
1169 * thus has very low overhead.
1170 *
1171 * Assumes that the caller, aio_aqueue(), has incremented the file
1172 * structure's reference count, preventing its deallocation for the
1173 * duration of this call.
1174 */
1175 static int
1176 aio_qphysio(struct proc *p, struct aiocblist *aiocbe)
1177 {
1178 struct aiocb *cb;
1179 struct file *fp;
1180 struct buf *bp;
1181 struct vnode *vp;
1182 struct kaioinfo *ki;
1183 struct aioliojob *lj;
1184 int error;
1185
1186 cb = &aiocbe->uaiocb;
1187 fp = aiocbe->fd_file;
1188
1189 if (fp->f_type != DTYPE_VNODE)
1190 return (-1);
1191
1192 vp = fp->f_vnode;
1193
1194 /*
1195 * If its not a disk, we don't want to return a positive error.
1196 * It causes the aio code to not fall through to try the thread
1197 * way when you're talking to a regular file.
1198 */
1199 if (!vn_isdisk(vp, &error)) {
1200 if (error == ENOTBLK)
1201 return (-1);
1202 else
1203 return (error);
1204 }
1205
1206 if (vp->v_bufobj.bo_bsize == 0)
1207 return (-1);
1208
1209 if (cb->aio_nbytes % vp->v_bufobj.bo_bsize)
1210 return (-1);
1211
1212 if (cb->aio_nbytes > vp->v_rdev->si_iosize_max)
1213 return (-1);
1214
1215 if (cb->aio_nbytes >
1216 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK))
1217 return (-1);
1218
1219 ki = p->p_aioinfo;
1220 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count)
1221 return (-1);
1222
1223 /* Create and build a buffer header for a transfer. */
1224 bp = (struct buf *)getpbuf(NULL);
1225 BUF_KERNPROC(bp);
1226
1227 AIO_LOCK(ki);
1228 ki->kaio_count++;
1229 ki->kaio_buffer_count++;
1230 lj = aiocbe->lio;
1231 if (lj)
1232 lj->lioj_count++;
1233 AIO_UNLOCK(ki);
1234
1235 /*
1236 * Get a copy of the kva from the physical buffer.
1237 */
1238 error = 0;
1239
1240 bp->b_bcount = cb->aio_nbytes;
1241 bp->b_bufsize = cb->aio_nbytes;
1242 bp->b_iodone = aio_physwakeup;
1243 bp->b_saveaddr = bp->b_data;
1244 bp->b_data = (void *)(uintptr_t)cb->aio_buf;
1245 bp->b_offset = cb->aio_offset;
1246 bp->b_iooffset = cb->aio_offset;
1247 bp->b_blkno = btodb(cb->aio_offset);
1248 bp->b_iocmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ;
1249
1250 /*
1251 * Bring buffer into kernel space.
1252 */
1253 if (vmapbuf(bp) < 0) {
1254 error = EFAULT;
1255 goto doerror;
1256 }
1257
1258 AIO_LOCK(ki);
1259 aiocbe->bp = bp;
1260 bp->b_caller1 = (void *)aiocbe;
1261 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist);
1262 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
1263 aiocbe->jobstate = JOBST_JOBQBUF;
1264 cb->_aiocb_private.status = cb->aio_nbytes;
1265 AIO_UNLOCK(ki);
1266
1267 atomic_add_int(&num_queue_count, 1);
1268 atomic_add_int(&num_buf_aio, 1);
1269
1270 bp->b_error = 0;
1271
1272 TASK_INIT(&aiocbe->biotask, 0, biohelper, aiocbe);
1273
1274 /* Perform transfer. */
1275 dev_strategy(vp->v_rdev, bp);
1276 return (0);
1277
1278 doerror:
1279 AIO_LOCK(ki);
1280 ki->kaio_count--;
1281 ki->kaio_buffer_count--;
1282 if (lj)
1283 lj->lioj_count--;
1284 aiocbe->bp = NULL;
1285 AIO_UNLOCK(ki);
1286 relpbuf(bp, NULL);
1287 return (error);
1288 }
1289
1290 /*
1291 * Wake up aio requests that may be serviceable now.
1292 */
1293 static void
1294 aio_swake_cb(struct socket *so, struct sockbuf *sb)
1295 {
1296 struct aiocblist *cb, *cbn;
1297 int opcode;
1298
1299 if (sb == &so->so_snd)
1300 opcode = LIO_WRITE;
1301 else
1302 opcode = LIO_READ;
1303
1304 SOCKBUF_LOCK(sb);
1305 sb->sb_flags &= ~SB_AIO;
1306 mtx_lock(&aio_job_mtx);
1307 TAILQ_FOREACH_SAFE(cb, &so->so_aiojobq, list, cbn) {
1308 if (opcode == cb->uaiocb.aio_lio_opcode) {
1309 if (cb->jobstate != JOBST_JOBQSOCK)
1310 panic("invalid queue value");
1311 /* XXX
1312 * We don't have actual sockets backend yet,
1313 * so we simply move the requests to the generic
1314 * file I/O backend.
1315 */
1316 TAILQ_REMOVE(&so->so_aiojobq, cb, list);
1317 TAILQ_INSERT_TAIL(&aio_jobs, cb, list);
1318 aio_kick_nowait(cb->userproc);
1319 }
1320 }
1321 mtx_unlock(&aio_job_mtx);
1322 SOCKBUF_UNLOCK(sb);
1323 }
1324
1325 /*
1326 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR
1327 * technique is done in this code.
1328 */
1329 int
1330 aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
1331 int type, int oldsigev)
1332 {
1333 struct proc *p = td->td_proc;
1334 struct file *fp;
1335 struct socket *so;
1336 struct aiocblist *aiocbe, *cb;
1337 struct kaioinfo *ki;
1338 struct kevent kev;
1339 struct sockbuf *sb;
1340 int opcode;
1341 int error;
1342 int fd, kqfd;
1343 int jid;
1344
1345 if (p->p_aioinfo == NULL)
1346 aio_init_aioinfo(p);
1347
1348 ki = p->p_aioinfo;
1349
1350 suword(&job->_aiocb_private.status, -1);
1351 suword(&job->_aiocb_private.error, 0);
1352 suword(&job->_aiocb_private.kernelinfo, -1);
1353
1354 if (num_queue_count >= max_queue_count ||
1355 ki->kaio_count >= ki->kaio_qallowed_count) {
1356 suword(&job->_aiocb_private.error, EAGAIN);
1357 return (EAGAIN);
1358 }
1359
1360 aiocbe = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO);
1361 aiocbe->inputcharge = 0;
1362 aiocbe->outputcharge = 0;
1363 knlist_init(&aiocbe->klist, AIO_MTX(ki), NULL, NULL, NULL);
1364
1365 if (oldsigev) {
1366 bzero(&aiocbe->uaiocb, sizeof(struct aiocb));
1367 error = copyin(job, &aiocbe->uaiocb, sizeof(struct oaiocb));
1368 bcopy(&aiocbe->uaiocb.__spare__, &aiocbe->uaiocb.aio_sigevent,
1369 sizeof(struct osigevent));
1370 } else {
1371 error = copyin(job, &aiocbe->uaiocb, sizeof(struct aiocb));
1372 }
1373 if (error) {
1374 suword(&job->_aiocb_private.error, error);
1375 uma_zfree(aiocb_zone, aiocbe);
1376 return (error);
1377 }
1378
1379 if (aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT &&
1380 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL &&
1381 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID &&
1382 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) {
1383 suword(&job->_aiocb_private.error, EINVAL);
1384 uma_zfree(aiocb_zone, aiocbe);
1385 return (EINVAL);
1386 }
1387
1388 if ((aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
1389 aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) &&
1390 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) {
1391 uma_zfree(aiocb_zone, aiocbe);
1392 return (EINVAL);
1393 }
1394
1395 ksiginfo_init(&aiocbe->ksi);
1396
1397 /* Save userspace address of the job info. */
1398 aiocbe->uuaiocb = job;
1399
1400 /* Get the opcode. */
1401 if (type != LIO_NOP)
1402 aiocbe->uaiocb.aio_lio_opcode = type;
1403 opcode = aiocbe->uaiocb.aio_lio_opcode;
1404
1405 /* Fetch the file object for the specified file descriptor. */
1406 fd = aiocbe->uaiocb.aio_fildes;
1407 switch (opcode) {
1408 case LIO_WRITE:
1409 error = fget_write(td, fd, &fp);
1410 break;
1411 case LIO_READ:
1412 error = fget_read(td, fd, &fp);
1413 break;
1414 default:
1415 error = fget(td, fd, &fp);
1416 }
1417 if (error) {
1418 uma_zfree(aiocb_zone, aiocbe);
1419 suword(&job->_aiocb_private.error, error);
1420 return (error);
1421 }
1422
1423 if (opcode == LIO_SYNC && fp->f_vnode == NULL) {
1424 error = EINVAL;
1425 goto aqueue_fail;
1426 }
1427
1428 if (opcode != LIO_SYNC && aiocbe->uaiocb.aio_offset == -1LL) {
1429 error = EINVAL;
1430 goto aqueue_fail;
1431 }
1432
1433 aiocbe->fd_file = fp;
1434
1435 mtx_lock(&aio_job_mtx);
1436 jid = jobrefid++;
1437 aiocbe->seqno = jobseqno++;
1438 mtx_unlock(&aio_job_mtx);
1439 error = suword(&job->_aiocb_private.kernelinfo, jid);
1440 if (error) {
1441 error = EINVAL;
1442 goto aqueue_fail;
1443 }
1444 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid;
1445
1446 if (opcode == LIO_NOP) {
1447 fdrop(fp, td);
1448 uma_zfree(aiocb_zone, aiocbe);
1449 return (0);
1450 }
1451 if ((opcode != LIO_READ) && (opcode != LIO_WRITE) &&
1452 (opcode != LIO_SYNC)) {
1453 error = EINVAL;
1454 goto aqueue_fail;
1455 }
1456
1457 if (aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT)
1458 goto no_kqueue;
1459 kqfd = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue;
1460 kev.ident = (uintptr_t)aiocbe->uuaiocb;
1461 kev.filter = EVFILT_AIO;
1462 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
1463 kev.data = (intptr_t)aiocbe;
1464 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sival_ptr;
1465 error = kqfd_register(kqfd, &kev, td, 1);
1466 aqueue_fail:
1467 if (error) {
1468 fdrop(fp, td);
1469 uma_zfree(aiocb_zone, aiocbe);
1470 suword(&job->_aiocb_private.error, error);
1471 goto done;
1472 }
1473 no_kqueue:
1474
1475 suword(&job->_aiocb_private.error, EINPROGRESS);
1476 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS;
1477 aiocbe->userproc = p;
1478 aiocbe->cred = crhold(td->td_ucred);
1479 aiocbe->jobflags = 0;
1480 aiocbe->lio = lj;
1481
1482 if (opcode == LIO_SYNC)
1483 goto queueit;
1484
1485 if (fp->f_type == DTYPE_SOCKET) {
1486 /*
1487 * Alternate queueing for socket ops: Reach down into the
1488 * descriptor to get the socket data. Then check to see if the
1489 * socket is ready to be read or written (based on the requested
1490 * operation).
1491 *
1492 * If it is not ready for io, then queue the aiocbe on the
1493 * socket, and set the flags so we get a call when sbnotify()
1494 * happens.
1495 *
1496 * Note if opcode is neither LIO_WRITE nor LIO_READ we lock
1497 * and unlock the snd sockbuf for no reason.
1498 */
1499 so = fp->f_data;
1500 sb = (opcode == LIO_READ) ? &so->so_rcv : &so->so_snd;
1501 SOCKBUF_LOCK(sb);
1502 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode ==
1503 LIO_WRITE) && (!sowriteable(so)))) {
1504 sb->sb_flags |= SB_AIO;
1505
1506 mtx_lock(&aio_job_mtx);
1507 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list);
1508 mtx_unlock(&aio_job_mtx);
1509
1510 AIO_LOCK(ki);
1511 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
1512 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
1513 aiocbe->jobstate = JOBST_JOBQSOCK;
1514 ki->kaio_count++;
1515 if (lj)
1516 lj->lioj_count++;
1517 AIO_UNLOCK(ki);
1518 SOCKBUF_UNLOCK(sb);
1519 atomic_add_int(&num_queue_count, 1);
1520 error = 0;
1521 goto done;
1522 }
1523 SOCKBUF_UNLOCK(sb);
1524 }
1525
1526 if ((error = aio_qphysio(p, aiocbe)) == 0)
1527 goto done;
1528 #if 0
1529 if (error > 0) {
1530 aiocbe->uaiocb._aiocb_private.error = error;
1531 suword(&job->_aiocb_private.error, error);
1532 goto done;
1533 }
1534 #endif
1535 queueit:
1536 /* No buffer for daemon I/O. */
1537 aiocbe->bp = NULL;
1538 atomic_add_int(&num_queue_count, 1);
1539
1540 AIO_LOCK(ki);
1541 ki->kaio_count++;
1542 if (lj)
1543 lj->lioj_count++;
1544 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
1545 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
1546 if (opcode == LIO_SYNC) {
1547 TAILQ_FOREACH(cb, &ki->kaio_jobqueue, plist) {
1548 if (cb->fd_file == aiocbe->fd_file &&
1549 cb->uaiocb.aio_lio_opcode != LIO_SYNC &&
1550 cb->seqno < aiocbe->seqno) {
1551 cb->jobflags |= AIOCBLIST_CHECKSYNC;
1552 aiocbe->pending++;
1553 }
1554 }
1555 TAILQ_FOREACH(cb, &ki->kaio_bufqueue, plist) {
1556 if (cb->fd_file == aiocbe->fd_file &&
1557 cb->uaiocb.aio_lio_opcode != LIO_SYNC &&
1558 cb->seqno < aiocbe->seqno) {
1559 cb->jobflags |= AIOCBLIST_CHECKSYNC;
1560 aiocbe->pending++;
1561 }
1562 }
1563 if (aiocbe->pending != 0) {
1564 TAILQ_INSERT_TAIL(&ki->kaio_syncqueue, aiocbe, list);
1565 aiocbe->jobstate = JOBST_JOBQSYNC;
1566 AIO_UNLOCK(ki);
1567 goto done;
1568 }
1569 }
1570 mtx_lock(&aio_job_mtx);
1571 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
1572 aiocbe->jobstate = JOBST_JOBQGLOBAL;
1573 aio_kick_nowait(p);
1574 mtx_unlock(&aio_job_mtx);
1575 AIO_UNLOCK(ki);
1576 error = 0;
1577 done:
1578 return (error);
1579 }
1580
1581 static void
1582 aio_kick_nowait(struct proc *userp)
1583 {
1584 struct kaioinfo *ki = userp->p_aioinfo;
1585 struct aiothreadlist *aiop;
1586
1587 mtx_assert(&aio_job_mtx, MA_OWNED);
1588 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1589 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1590 aiop->aiothreadflags &= ~AIOP_FREE;
1591 wakeup(aiop->aiothread);
1592 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
1593 ((ki->kaio_active_count + num_aio_resv_start) <
1594 ki->kaio_maxactive_count)) {
1595 taskqueue_enqueue(taskqueue_aiod_bio, &ki->kaio_task);
1596 }
1597 }
1598
1599 static int
1600 aio_kick(struct proc *userp)
1601 {
1602 struct kaioinfo *ki = userp->p_aioinfo;
1603 struct aiothreadlist *aiop;
1604 int error, ret = 0;
1605
1606 mtx_assert(&aio_job_mtx, MA_OWNED);
1607 retryproc:
1608 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1609 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1610 aiop->aiothreadflags &= ~AIOP_FREE;
1611 wakeup(aiop->aiothread);
1612 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
1613 ((ki->kaio_active_count + num_aio_resv_start) <
1614 ki->kaio_maxactive_count)) {
1615 num_aio_resv_start++;
1616 mtx_unlock(&aio_job_mtx);
1617 error = aio_newproc(&num_aio_resv_start);
1618 mtx_lock(&aio_job_mtx);
1619 if (error) {
1620 num_aio_resv_start--;
1621 goto retryproc;
1622 }
1623 } else {
1624 ret = -1;
1625 }
1626 return (ret);
1627 }
1628
1629 static void
1630 aio_kick_helper(void *context, int pending)
1631 {
1632 struct proc *userp = context;
1633
1634 mtx_lock(&aio_job_mtx);
1635 while (--pending >= 0) {
1636 if (aio_kick(userp))
1637 break;
1638 }
1639 mtx_unlock(&aio_job_mtx);
1640 }
1641
1642 /*
1643 * Support the aio_return system call, as a side-effect, kernel resources are
1644 * released.
1645 */
1646 int
1647 aio_return(struct thread *td, struct aio_return_args *uap)
1648 {
1649 struct proc *p = td->td_proc;
1650 struct aiocblist *cb;
1651 struct aiocb *uaiocb;
1652 struct kaioinfo *ki;
1653 int status, error;
1654
1655 ki = p->p_aioinfo;
1656 if (ki == NULL)
1657 return (EINVAL);
1658 uaiocb = uap->aiocbp;
1659 AIO_LOCK(ki);
1660 TAILQ_FOREACH(cb, &ki->kaio_done, plist) {
1661 if (cb->uuaiocb == uaiocb)
1662 break;
1663 }
1664 if (cb != NULL) {
1665 MPASS(cb->jobstate == JOBST_JOBFINISHED);
1666 status = cb->uaiocb._aiocb_private.status;
1667 error = cb->uaiocb._aiocb_private.error;
1668 td->td_retval[0] = status;
1669 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
1670 td->td_ru.ru_oublock += cb->outputcharge;
1671 cb->outputcharge = 0;
1672 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
1673 td->td_ru.ru_inblock += cb->inputcharge;
1674 cb->inputcharge = 0;
1675 }
1676 aio_free_entry(cb);
1677 AIO_UNLOCK(ki);
1678 suword(&uaiocb->_aiocb_private.error, error);
1679 suword(&uaiocb->_aiocb_private.status, status);
1680 } else {
1681 error = EINVAL;
1682 AIO_UNLOCK(ki);
1683 }
1684 return (error);
1685 }
1686
1687 /*
1688 * Allow a process to wakeup when any of the I/O requests are completed.
1689 */
1690 int
1691 aio_suspend(struct thread *td, struct aio_suspend_args *uap)
1692 {
1693 struct proc *p = td->td_proc;
1694 struct timeval atv;
1695 struct timespec ts;
1696 struct aiocb *const *cbptr, *cbp;
1697 struct kaioinfo *ki;
1698 struct aiocblist *cb, *cbfirst;
1699 struct aiocb **ujoblist;
1700 int njoblist;
1701 int error;
1702 int timo;
1703 int i;
1704
1705 if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX)
1706 return (EINVAL);
1707
1708 timo = 0;
1709 if (uap->timeout) {
1710 /* Get timespec struct. */
1711 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
1712 return (error);
1713
1714 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
1715 return (EINVAL);
1716
1717 TIMESPEC_TO_TIMEVAL(&atv, &ts);
1718 if (itimerfix(&atv))
1719 return (EINVAL);
1720 timo = tvtohz(&atv);
1721 }
1722
1723 ki = p->p_aioinfo;
1724 if (ki == NULL)
1725 return (EAGAIN);
1726
1727 njoblist = 0;
1728 ujoblist = uma_zalloc(aiol_zone, M_WAITOK);
1729 cbptr = uap->aiocbp;
1730
1731 for (i = 0; i < uap->nent; i++) {
1732 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
1733 if (cbp == 0)
1734 continue;
1735 ujoblist[njoblist] = cbp;
1736 njoblist++;
1737 }
1738
1739 if (njoblist == 0) {
1740 uma_zfree(aiol_zone, ujoblist);
1741 return (0);
1742 }
1743
1744 AIO_LOCK(ki);
1745 for (;;) {
1746 cbfirst = NULL;
1747 error = 0;
1748 TAILQ_FOREACH(cb, &ki->kaio_all, allist) {
1749 for (i = 0; i < njoblist; i++) {
1750 if (cb->uuaiocb == ujoblist[i]) {
1751 if (cbfirst == NULL)
1752 cbfirst = cb;
1753 if (cb->jobstate == JOBST_JOBFINISHED)
1754 goto RETURN;
1755 }
1756 }
1757 }
1758 /* All tasks were finished. */
1759 if (cbfirst == NULL)
1760 break;
1761
1762 ki->kaio_flags |= KAIO_WAKEUP;
1763 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
1764 "aiospn", timo);
1765 if (error == ERESTART)
1766 error = EINTR;
1767 if (error)
1768 break;
1769 }
1770 RETURN:
1771 AIO_UNLOCK(ki);
1772 uma_zfree(aiol_zone, ujoblist);
1773 return (error);
1774 }
1775
1776 /*
1777 * aio_cancel cancels any non-physio aio operations not currently in
1778 * progress.
1779 */
1780 int
1781 aio_cancel(struct thread *td, struct aio_cancel_args *uap)
1782 {
1783 struct proc *p = td->td_proc;
1784 struct kaioinfo *ki;
1785 struct aiocblist *cbe, *cbn;
1786 struct file *fp;
1787 struct socket *so;
1788 int error;
1789 int remove;
1790 int cancelled = 0;
1791 int notcancelled = 0;
1792 struct vnode *vp;
1793
1794 /* Lookup file object. */
1795 error = fget(td, uap->fd, &fp);
1796 if (error)
1797 return (error);
1798
1799 ki = p->p_aioinfo;
1800 if (ki == NULL)
1801 goto done;
1802
1803 if (fp->f_type == DTYPE_VNODE) {
1804 vp = fp->f_vnode;
1805 if (vn_isdisk(vp, &error)) {
1806 fdrop(fp, td);
1807 td->td_retval[0] = AIO_NOTCANCELED;
1808 return (0);
1809 }
1810 }
1811
1812 AIO_LOCK(ki);
1813 TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) {
1814 if ((uap->fd == cbe->uaiocb.aio_fildes) &&
1815 ((uap->aiocbp == NULL) ||
1816 (uap->aiocbp == cbe->uuaiocb))) {
1817 remove = 0;
1818
1819 mtx_lock(&aio_job_mtx);
1820 if (cbe->jobstate == JOBST_JOBQGLOBAL) {
1821 TAILQ_REMOVE(&aio_jobs, cbe, list);
1822 remove = 1;
1823 } else if (cbe->jobstate == JOBST_JOBQSOCK) {
1824 MPASS(fp->f_type == DTYPE_SOCKET);
1825 so = fp->f_data;
1826 TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
1827 remove = 1;
1828 } else if (cbe->jobstate == JOBST_JOBQSYNC) {
1829 TAILQ_REMOVE(&ki->kaio_syncqueue, cbe, list);
1830 remove = 1;
1831 }
1832 mtx_unlock(&aio_job_mtx);
1833
1834 if (remove) {
1835 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
1836 cbe->uaiocb._aiocb_private.status = -1;
1837 cbe->uaiocb._aiocb_private.error = ECANCELED;
1838 aio_bio_done_notify(p, cbe, DONE_QUEUE);
1839 cancelled++;
1840 } else {
1841 notcancelled++;
1842 }
1843 if (uap->aiocbp != NULL)
1844 break;
1845 }
1846 }
1847 AIO_UNLOCK(ki);
1848
1849 done:
1850 fdrop(fp, td);
1851
1852 if (uap->aiocbp != NULL) {
1853 if (cancelled) {
1854 td->td_retval[0] = AIO_CANCELED;
1855 return (0);
1856 }
1857 }
1858
1859 if (notcancelled) {
1860 td->td_retval[0] = AIO_NOTCANCELED;
1861 return (0);
1862 }
1863
1864 if (cancelled) {
1865 td->td_retval[0] = AIO_CANCELED;
1866 return (0);
1867 }
1868
1869 td->td_retval[0] = AIO_ALLDONE;
1870
1871 return (0);
1872 }
1873
1874 /*
1875 * aio_error is implemented in the kernel level for compatibility purposes
1876 * only. For a user mode async implementation, it would be best to do it in
1877 * a userland subroutine.
1878 */
1879 int
1880 aio_error(struct thread *td, struct aio_error_args *uap)
1881 {
1882 struct proc *p = td->td_proc;
1883 struct aiocblist *cb;
1884 struct kaioinfo *ki;
1885 int status;
1886
1887 ki = p->p_aioinfo;
1888 if (ki == NULL) {
1889 td->td_retval[0] = EINVAL;
1890 return (0);
1891 }
1892
1893 AIO_LOCK(ki);
1894 TAILQ_FOREACH(cb, &ki->kaio_all, allist) {
1895 if (cb->uuaiocb == uap->aiocbp) {
1896 if (cb->jobstate == JOBST_JOBFINISHED)
1897 td->td_retval[0] =
1898 cb->uaiocb._aiocb_private.error;
1899 else
1900 td->td_retval[0] = EINPROGRESS;
1901 AIO_UNLOCK(ki);
1902 return (0);
1903 }
1904 }
1905 AIO_UNLOCK(ki);
1906
1907 /*
1908 * Hack for failure of aio_aqueue.
1909 */
1910 status = fuword(&uap->aiocbp->_aiocb_private.status);
1911 if (status == -1) {
1912 td->td_retval[0] = fuword(&uap->aiocbp->_aiocb_private.error);
1913 return (0);
1914 }
1915
1916 td->td_retval[0] = EINVAL;
1917 return (0);
1918 }
1919
1920 /* syscall - asynchronous read from a file (REALTIME) */
1921 int
1922 oaio_read(struct thread *td, struct oaio_read_args *uap)
1923 {
1924
1925 return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 1);
1926 }
1927
1928 int
1929 aio_read(struct thread *td, struct aio_read_args *uap)
1930 {
1931
1932 return aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, 0);
1933 }
1934
1935 /* syscall - asynchronous write to a file (REALTIME) */
1936 int
1937 oaio_write(struct thread *td, struct oaio_write_args *uap)
1938 {
1939
1940 return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 1);
1941 }
1942
1943 int
1944 aio_write(struct thread *td, struct aio_write_args *uap)
1945 {
1946
1947 return aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, 0);
1948 }
1949
1950 /* syscall - list directed I/O (REALTIME) */
1951 int
1952 olio_listio(struct thread *td, struct olio_listio_args *uap)
1953 {
1954 return do_lio_listio(td, (struct lio_listio_args *)uap, 1);
1955 }
1956
1957 /* syscall - list directed I/O (REALTIME) */
1958 int
1959 lio_listio(struct thread *td, struct lio_listio_args *uap)
1960 {
1961 return do_lio_listio(td, uap, 0);
1962 }
1963
1964 static int
1965 do_lio_listio(struct thread *td, struct lio_listio_args *uap, int oldsigev)
1966 {
1967 struct proc *p = td->td_proc;
1968 struct aiocb *iocb, * const *cbptr;
1969 struct kaioinfo *ki;
1970 struct aioliojob *lj;
1971 struct kevent kev;
1972 int nent;
1973 int error;
1974 int nerror;
1975 int i;
1976
1977 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
1978 return (EINVAL);
1979
1980 nent = uap->nent;
1981 if (nent < 0 || nent > AIO_LISTIO_MAX)
1982 return (EINVAL);
1983
1984 if (p->p_aioinfo == NULL)
1985 aio_init_aioinfo(p);
1986
1987 ki = p->p_aioinfo;
1988
1989 lj = uma_zalloc(aiolio_zone, M_WAITOK);
1990 lj->lioj_flags = 0;
1991 lj->lioj_count = 0;
1992 lj->lioj_finished_count = 0;
1993 knlist_init(&lj->klist, AIO_MTX(ki), NULL, NULL, NULL);
1994 ksiginfo_init(&lj->lioj_ksi);
1995
1996 /*
1997 * Setup signal.
1998 */
1999 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2000 bzero(&lj->lioj_signal, sizeof(&lj->lioj_signal));
2001 error = copyin(uap->sig, &lj->lioj_signal,
2002 oldsigev ? sizeof(struct osigevent) :
2003 sizeof(struct sigevent));
2004 if (error) {
2005 uma_zfree(aiolio_zone, lj);
2006 return (error);
2007 }
2008
2009 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
2010 /* Assume only new style KEVENT */
2011 kev.filter = EVFILT_LIO;
2012 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
2013 kev.ident = (uintptr_t)uap->acb_list; /* something unique */
2014 kev.data = (intptr_t)lj;
2015 /* pass user defined sigval data */
2016 kev.udata = lj->lioj_signal.sigev_value.sival_ptr;
2017 error = kqfd_register(
2018 lj->lioj_signal.sigev_notify_kqueue, &kev, td, 1);
2019 if (error) {
2020 uma_zfree(aiolio_zone, lj);
2021 return (error);
2022 }
2023 } else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) {
2024 ;
2025 } else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
2026 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) {
2027 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
2028 uma_zfree(aiolio_zone, lj);
2029 return EINVAL;
2030 }
2031 lj->lioj_flags |= LIOJ_SIGNAL;
2032 } else {
2033 uma_zfree(aiolio_zone, lj);
2034 return EINVAL;
2035 }
2036 }
2037
2038 AIO_LOCK(ki);
2039 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
2040 /*
2041 * Add extra aiocb count to avoid the lio to be freed
2042 * by other threads doing aio_waitcomplete or aio_return,
2043 * and prevent event from being sent until we have queued
2044 * all tasks.
2045 */
2046 lj->lioj_count = 1;
2047 AIO_UNLOCK(ki);
2048
2049 /*
2050 * Get pointers to the list of I/O requests.
2051 */
2052 nerror = 0;
2053 cbptr = uap->acb_list;
2054 for (i = 0; i < uap->nent; i++) {
2055 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
2056 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) {
2057 error = aio_aqueue(td, iocb, lj, LIO_NOP, oldsigev);
2058 if (error != 0)
2059 nerror++;
2060 }
2061 }
2062
2063 error = 0;
2064 AIO_LOCK(ki);
2065 if (uap->mode == LIO_WAIT) {
2066 while (lj->lioj_count - 1 != lj->lioj_finished_count) {
2067 ki->kaio_flags |= KAIO_WAKEUP;
2068 error = msleep(&p->p_aioinfo, AIO_MTX(ki),
2069 PRIBIO | PCATCH, "aiospn", 0);
2070 if (error == ERESTART)
2071 error = EINTR;
2072 if (error)
2073 break;
2074 }
2075 } else {
2076 if (lj->lioj_count - 1 == lj->lioj_finished_count) {
2077 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
2078 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
2079 KNOTE_LOCKED(&lj->klist, 1);
2080 }
2081 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
2082 == LIOJ_SIGNAL
2083 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
2084 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
2085 aio_sendsig(p, &lj->lioj_signal,
2086 &lj->lioj_ksi);
2087 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
2088 }
2089 }
2090 }
2091 lj->lioj_count--;
2092 if (lj->lioj_count == 0) {
2093 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
2094 knlist_delete(&lj->klist, curthread, 1);
2095 PROC_LOCK(p);
2096 sigqueue_take(&lj->lioj_ksi);
2097 PROC_UNLOCK(p);
2098 AIO_UNLOCK(ki);
2099 uma_zfree(aiolio_zone, lj);
2100 } else
2101 AIO_UNLOCK(ki);
2102
2103 if (nerror)
2104 return (EIO);
2105 return (error);
2106 }
2107
2108 /*
2109 * Called from interrupt thread for physio, we should return as fast
2110 * as possible, so we schedule a biohelper task.
2111 */
2112 static void
2113 aio_physwakeup(struct buf *bp)
2114 {
2115 struct aiocblist *aiocbe;
2116
2117 aiocbe = (struct aiocblist *)bp->b_caller1;
2118 taskqueue_enqueue(taskqueue_aiod_bio, &aiocbe->biotask);
2119 }
2120
2121 /*
2122 * Task routine to perform heavy tasks, process wakeup, and signals.
2123 */
2124 static void
2125 biohelper(void *context, int pending)
2126 {
2127 struct aiocblist *aiocbe = context;
2128 struct buf *bp;
2129 struct proc *userp;
2130 struct kaioinfo *ki;
2131 int nblks;
2132
2133 bp = aiocbe->bp;
2134 userp = aiocbe->userproc;
2135 ki = userp->p_aioinfo;
2136 AIO_LOCK(ki);
2137 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid;
2138 aiocbe->uaiocb._aiocb_private.error = 0;
2139 if (bp->b_ioflags & BIO_ERROR)
2140 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
2141 nblks = btodb(aiocbe->uaiocb.aio_nbytes);
2142 if (aiocbe->uaiocb.aio_lio_opcode == LIO_WRITE)
2143 aiocbe->outputcharge += nblks;
2144 else
2145 aiocbe->inputcharge += nblks;
2146 aiocbe->bp = NULL;
2147 TAILQ_REMOVE(&userp->p_aioinfo->kaio_bufqueue, aiocbe, plist);
2148 ki->kaio_buffer_count--;
2149 aio_bio_done_notify(userp, aiocbe, DONE_BUF);
2150 AIO_UNLOCK(ki);
2151
2152 /* Release mapping into kernel space. */
2153 vunmapbuf(bp);
2154 relpbuf(bp, NULL);
2155 atomic_subtract_int(&num_buf_aio, 1);
2156 }
2157
2158 /* syscall - wait for the next completion of an aio request */
2159 int
2160 aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap)
2161 {
2162 struct proc *p = td->td_proc;
2163 struct timeval atv;
2164 struct timespec ts;
2165 struct kaioinfo *ki;
2166 struct aiocblist *cb;
2167 struct aiocb *uuaiocb;
2168 int error, status, timo;
2169
2170 suword(uap->aiocbp, (long)NULL);
2171
2172 timo = 0;
2173 if (uap->timeout) {
2174 /* Get timespec struct. */
2175 error = copyin(uap->timeout, &ts, sizeof(ts));
2176 if (error)
2177 return (error);
2178
2179 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000))
2180 return (EINVAL);
2181
2182 TIMESPEC_TO_TIMEVAL(&atv, &ts);
2183 if (itimerfix(&atv))
2184 return (EINVAL);
2185 timo = tvtohz(&atv);
2186 }
2187
2188 if (p->p_aioinfo == NULL)
2189 aio_init_aioinfo(p);
2190 ki = p->p_aioinfo;
2191
2192 error = 0;
2193 cb = NULL;
2194 AIO_LOCK(ki);
2195 while ((cb = TAILQ_FIRST(&ki->kaio_done)) == NULL) {
2196 ki->kaio_flags |= KAIO_WAKEUP;
2197 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
2198 "aiowc", timo);
2199 if (timo && error == ERESTART)
2200 error = EINTR;
2201 if (error)
2202 break;
2203 }
2204
2205 if (cb != NULL) {
2206 MPASS(cb->jobstate == JOBST_JOBFINISHED);
2207 uuaiocb = cb->uuaiocb;
2208 status = cb->uaiocb._aiocb_private.status;
2209 error = cb->uaiocb._aiocb_private.error;
2210 td->td_retval[0] = status;
2211 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
2212 td->td_ru.ru_oublock += cb->outputcharge;
2213 cb->outputcharge = 0;
2214 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
2215 td->td_ru.ru_inblock += cb->inputcharge;
2216 cb->inputcharge = 0;
2217 }
2218 aio_free_entry(cb);
2219 AIO_UNLOCK(ki);
2220 suword(uap->aiocbp, (long)uuaiocb);
2221 suword(&uuaiocb->_aiocb_private.error, error);
2222 suword(&uuaiocb->_aiocb_private.status, status);
2223 } else
2224 AIO_UNLOCK(ki);
2225
2226 return (error);
2227 }
2228
2229 int
2230 aio_fsync(struct thread *td, struct aio_fsync_args *uap)
2231 {
2232 struct proc *p = td->td_proc;
2233 struct kaioinfo *ki;
2234
2235 if (uap->op != O_SYNC) /* XXX lack of O_DSYNC */
2236 return (EINVAL);
2237 ki = p->p_aioinfo;
2238 if (ki == NULL)
2239 aio_init_aioinfo(p);
2240 return aio_aqueue(td, uap->aiocbp, NULL, LIO_SYNC, 0);
2241 }
2242
2243 /* kqueue attach function */
2244 static int
2245 filt_aioattach(struct knote *kn)
2246 {
2247 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2248
2249 /*
2250 * The aiocbe pointer must be validated before using it, so
2251 * registration is restricted to the kernel; the user cannot
2252 * set EV_FLAG1.
2253 */
2254 if ((kn->kn_flags & EV_FLAG1) == 0)
2255 return (EPERM);
2256 kn->kn_ptr.p_aio = aiocbe;
2257 kn->kn_flags &= ~EV_FLAG1;
2258
2259 knlist_add(&aiocbe->klist, kn, 0);
2260
2261 return (0);
2262 }
2263
2264 /* kqueue detach function */
2265 static void
2266 filt_aiodetach(struct knote *kn)
2267 {
2268 struct aiocblist *aiocbe = kn->kn_ptr.p_aio;
2269
2270 if (!knlist_empty(&aiocbe->klist))
2271 knlist_remove(&aiocbe->klist, kn, 0);
2272 }
2273
2274 /* kqueue filter function */
2275 /*ARGSUSED*/
2276 static int
2277 filt_aio(struct knote *kn, long hint)
2278 {
2279 struct aiocblist *aiocbe = kn->kn_ptr.p_aio;
2280
2281 kn->kn_data = aiocbe->uaiocb._aiocb_private.error;
2282 if (aiocbe->jobstate != JOBST_JOBFINISHED)
2283 return (0);
2284 kn->kn_flags |= EV_EOF;
2285 return (1);
2286 }
2287
2288 /* kqueue attach function */
2289 static int
2290 filt_lioattach(struct knote *kn)
2291 {
2292 struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata;
2293
2294 /*
2295 * The aioliojob pointer must be validated before using it, so
2296 * registration is restricted to the kernel; the user cannot
2297 * set EV_FLAG1.
2298 */
2299 if ((kn->kn_flags & EV_FLAG1) == 0)
2300 return (EPERM);
2301 kn->kn_ptr.p_lio = lj;
2302 kn->kn_flags &= ~EV_FLAG1;
2303
2304 knlist_add(&lj->klist, kn, 0);
2305
2306 return (0);
2307 }
2308
2309 /* kqueue detach function */
2310 static void
2311 filt_liodetach(struct knote *kn)
2312 {
2313 struct aioliojob * lj = kn->kn_ptr.p_lio;
2314
2315 if (!knlist_empty(&lj->klist))
2316 knlist_remove(&lj->klist, kn, 0);
2317 }
2318
2319 /* kqueue filter function */
2320 /*ARGSUSED*/
2321 static int
2322 filt_lio(struct knote *kn, long hint)
2323 {
2324 struct aioliojob * lj = kn->kn_ptr.p_lio;
2325
2326 return (lj->lioj_flags & LIOJ_KEVENT_POSTED);
2327 }
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