FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_aio.c
1 /*-
2 * Copyright (c) 1997 John S. Dyson. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. John S. Dyson's name may not be used to endorse or promote products
10 * derived from this software without specific prior written permission.
11 *
12 * DISCLAIMER: This code isn't warranted to do anything useful. Anything
13 * bad that happens because of using this software isn't the responsibility
14 * of the author. This software is distributed AS-IS.
15 */
16
17 /*
18 * This file contains support for the POSIX 1003.1B AIO/LIO facility.
19 */
20
21 #include <sys/cdefs.h>
22 __FBSDID("$FreeBSD: releng/7.3/sys/kern/vfs_aio.c 202814 2010-01-22 17:02:07Z jhb $");
23
24 #include "opt_compat.h"
25
26 #include <sys/param.h>
27 #include <sys/systm.h>
28 #include <sys/malloc.h>
29 #include <sys/bio.h>
30 #include <sys/buf.h>
31 #include <sys/eventhandler.h>
32 #include <sys/sysproto.h>
33 #include <sys/filedesc.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
36 #include <sys/kthread.h>
37 #include <sys/fcntl.h>
38 #include <sys/file.h>
39 #include <sys/limits.h>
40 #include <sys/lock.h>
41 #include <sys/mutex.h>
42 #include <sys/unistd.h>
43 #include <sys/posix4.h>
44 #include <sys/proc.h>
45 #include <sys/resourcevar.h>
46 #include <sys/signalvar.h>
47 #include <sys/protosw.h>
48 #include <sys/sema.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/syscall.h>
52 #include <sys/sysent.h>
53 #include <sys/sysctl.h>
54 #include <sys/sx.h>
55 #include <sys/taskqueue.h>
56 #include <sys/vnode.h>
57 #include <sys/conf.h>
58 #include <sys/event.h>
59 #include <sys/mount.h>
60
61 #include <machine/atomic.h>
62
63 #include <vm/vm.h>
64 #include <vm/vm_extern.h>
65 #include <vm/pmap.h>
66 #include <vm/vm_map.h>
67 #include <vm/vm_object.h>
68 #include <vm/uma.h>
69 #include <sys/aio.h>
70
71 #include "opt_vfs_aio.h"
72
73 /*
74 * Counter for allocating reference ids to new jobs. Wrapped to 1 on
75 * overflow. (XXX will be removed soon.)
76 */
77 static u_long jobrefid;
78
79 /*
80 * Counter for aio_fsync.
81 */
82 static uint64_t jobseqno;
83
84 #define JOBST_NULL 0
85 #define JOBST_JOBQSOCK 1
86 #define JOBST_JOBQGLOBAL 2
87 #define JOBST_JOBRUNNING 3
88 #define JOBST_JOBFINISHED 4
89 #define JOBST_JOBQBUF 5
90 #define JOBST_JOBQSYNC 6
91
92 #ifndef MAX_AIO_PER_PROC
93 #define MAX_AIO_PER_PROC 32
94 #endif
95
96 #ifndef MAX_AIO_QUEUE_PER_PROC
97 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */
98 #endif
99
100 #ifndef MAX_AIO_PROCS
101 #define MAX_AIO_PROCS 32
102 #endif
103
104 #ifndef MAX_AIO_QUEUE
105 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */
106 #endif
107
108 #ifndef TARGET_AIO_PROCS
109 #define TARGET_AIO_PROCS 4
110 #endif
111
112 #ifndef MAX_BUF_AIO
113 #define MAX_BUF_AIO 16
114 #endif
115
116 #ifndef AIOD_TIMEOUT_DEFAULT
117 #define AIOD_TIMEOUT_DEFAULT (10 * hz)
118 #endif
119
120 #ifndef AIOD_LIFETIME_DEFAULT
121 #define AIOD_LIFETIME_DEFAULT (30 * hz)
122 #endif
123
124 FEATURE(aio, "Asynchronous I/O");
125
126 static MALLOC_DEFINE(M_LIO, "lio", "listio aio control block list");
127
128 static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management");
129
130 static int max_aio_procs = MAX_AIO_PROCS;
131 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs,
132 CTLFLAG_RW, &max_aio_procs, 0,
133 "Maximum number of kernel threads to use for handling async IO ");
134
135 static int num_aio_procs = 0;
136 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs,
137 CTLFLAG_RD, &num_aio_procs, 0,
138 "Number of presently active kernel threads for async IO");
139
140 /*
141 * The code will adjust the actual number of AIO processes towards this
142 * number when it gets a chance.
143 */
144 static int target_aio_procs = TARGET_AIO_PROCS;
145 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs,
146 0, "Preferred number of ready kernel threads for async IO");
147
148 static int max_queue_count = MAX_AIO_QUEUE;
149 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0,
150 "Maximum number of aio requests to queue, globally");
151
152 static int num_queue_count = 0;
153 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0,
154 "Number of queued aio requests");
155
156 static int num_buf_aio = 0;
157 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
158 "Number of aio requests presently handled by the buf subsystem");
159
160 /* Number of async I/O thread in the process of being started */
161 /* XXX This should be local to aio_aqueue() */
162 static int num_aio_resv_start = 0;
163
164 static int aiod_timeout;
165 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0,
166 "Timeout value for synchronous aio operations");
167
168 static int aiod_lifetime;
169 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0,
170 "Maximum lifetime for idle aiod");
171
172 static int unloadable = 0;
173 SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0,
174 "Allow unload of aio (not recommended)");
175
176
177 static int max_aio_per_proc = MAX_AIO_PER_PROC;
178 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
179 0, "Maximum active aio requests per process (stored in the process)");
180
181 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
182 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
183 &max_aio_queue_per_proc, 0,
184 "Maximum queued aio requests per process (stored in the process)");
185
186 static int max_buf_aio = MAX_BUF_AIO;
187 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
188 "Maximum buf aio requests per process (stored in the process)");
189
190 typedef struct oaiocb {
191 int aio_fildes; /* File descriptor */
192 off_t aio_offset; /* File offset for I/O */
193 volatile void *aio_buf; /* I/O buffer in process space */
194 size_t aio_nbytes; /* Number of bytes for I/O */
195 struct osigevent aio_sigevent; /* Signal to deliver */
196 int aio_lio_opcode; /* LIO opcode */
197 int aio_reqprio; /* Request priority -- ignored */
198 struct __aiocb_private _aiocb_private;
199 } oaiocb_t;
200
201 /*
202 * Below is a key of locks used to protect each member of struct aiocblist
203 * aioliojob and kaioinfo and any backends.
204 *
205 * * - need not protected
206 * a - locked by kaioinfo lock
207 * b - locked by backend lock, the backend lock can be null in some cases,
208 * for example, BIO belongs to this type, in this case, proc lock is
209 * reused.
210 * c - locked by aio_job_mtx, the lock for the generic file I/O backend.
211 */
212
213 /*
214 * Current, there is only two backends: BIO and generic file I/O.
215 * socket I/O is served by generic file I/O, this is not a good idea, since
216 * disk file I/O and any other types without O_NONBLOCK flag can block daemon
217 * threads, if there is no thread to serve socket I/O, the socket I/O will be
218 * delayed too long or starved, we should create some threads dedicated to
219 * sockets to do non-blocking I/O, same for pipe and fifo, for these I/O
220 * systems we really need non-blocking interface, fiddling O_NONBLOCK in file
221 * structure is not safe because there is race between userland and aio
222 * daemons.
223 */
224
225 struct aiocblist {
226 TAILQ_ENTRY(aiocblist) list; /* (b) internal list of for backend */
227 TAILQ_ENTRY(aiocblist) plist; /* (a) list of jobs for each backend */
228 TAILQ_ENTRY(aiocblist) allist; /* (a) list of all jobs in proc */
229 int jobflags; /* (a) job flags */
230 int jobstate; /* (b) job state */
231 int inputcharge; /* (*) input blockes */
232 int outputcharge; /* (*) output blockes */
233 struct buf *bp; /* (*) private to BIO backend,
234 * buffer pointer
235 */
236 struct proc *userproc; /* (*) user process */
237 struct ucred *cred; /* (*) active credential when created */
238 struct file *fd_file; /* (*) pointer to file structure */
239 struct aioliojob *lio; /* (*) optional lio job */
240 struct aiocb *uuaiocb; /* (*) pointer in userspace of aiocb */
241 struct knlist klist; /* (a) list of knotes */
242 struct aiocb uaiocb; /* (*) kernel I/O control block */
243 ksiginfo_t ksi; /* (a) realtime signal info */
244 struct task biotask; /* (*) private to BIO backend */
245 uint64_t seqno; /* (*) job number */
246 int pending; /* (a) number of pending I/O, aio_fsync only */
247 };
248
249 /* jobflags */
250 #define AIOCBLIST_DONE 0x01
251 #define AIOCBLIST_BUFDONE 0x02
252 #define AIOCBLIST_RUNDOWN 0x04
253 #define AIOCBLIST_CHECKSYNC 0x08
254
255 /*
256 * AIO process info
257 */
258 #define AIOP_FREE 0x1 /* proc on free queue */
259
260 struct aiothreadlist {
261 int aiothreadflags; /* (c) AIO proc flags */
262 TAILQ_ENTRY(aiothreadlist) list; /* (c) list of processes */
263 struct thread *aiothread; /* (*) the AIO thread */
264 };
265
266 /*
267 * data-structure for lio signal management
268 */
269 struct aioliojob {
270 int lioj_flags; /* (a) listio flags */
271 int lioj_count; /* (a) listio flags */
272 int lioj_finished_count; /* (a) listio flags */
273 struct sigevent lioj_signal; /* (a) signal on all I/O done */
274 TAILQ_ENTRY(aioliojob) lioj_list; /* (a) lio list */
275 struct knlist klist; /* (a) list of knotes */
276 ksiginfo_t lioj_ksi; /* (a) Realtime signal info */
277 };
278
279 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */
280 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */
281 #define LIOJ_KEVENT_POSTED 0x4 /* kevent triggered */
282
283 /*
284 * per process aio data structure
285 */
286 struct kaioinfo {
287 struct mtx kaio_mtx; /* the lock to protect this struct */
288 int kaio_flags; /* (a) per process kaio flags */
289 int kaio_maxactive_count; /* (*) maximum number of AIOs */
290 int kaio_active_count; /* (c) number of currently used AIOs */
291 int kaio_qallowed_count; /* (*) maxiumu size of AIO queue */
292 int kaio_count; /* (a) size of AIO queue */
293 int kaio_ballowed_count; /* (*) maximum number of buffers */
294 int kaio_buffer_count; /* (a) number of physio buffers */
295 TAILQ_HEAD(,aiocblist) kaio_all; /* (a) all AIOs in the process */
296 TAILQ_HEAD(,aiocblist) kaio_done; /* (a) done queue for process */
297 TAILQ_HEAD(,aioliojob) kaio_liojoblist; /* (a) list of lio jobs */
298 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* (a) job queue for process */
299 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* (a) buffer job queue for process */
300 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* (a) queue for aios waiting on sockets,
301 * NOT USED YET.
302 */
303 TAILQ_HEAD(,aiocblist) kaio_syncqueue; /* (a) queue for aio_fsync */
304 struct task kaio_task; /* (*) task to kick aio threads */
305 };
306
307 #define AIO_LOCK(ki) mtx_lock(&(ki)->kaio_mtx)
308 #define AIO_UNLOCK(ki) mtx_unlock(&(ki)->kaio_mtx)
309 #define AIO_LOCK_ASSERT(ki, f) mtx_assert(&(ki)->kaio_mtx, (f))
310 #define AIO_MTX(ki) (&(ki)->kaio_mtx)
311
312 #define KAIO_RUNDOWN 0x1 /* process is being run down */
313 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */
314
315 /*
316 * Operations used to interact with userland aio control blocks.
317 * Different ABIs provide their own operations.
318 */
319 struct aiocb_ops {
320 int (*copyin)(struct aiocb *ujob, struct aiocb *kjob);
321 long (*fetch_status)(struct aiocb *ujob);
322 long (*fetch_error)(struct aiocb *ujob);
323 int (*store_status)(struct aiocb *ujob, long status);
324 int (*store_error)(struct aiocb *ujob, long error);
325 int (*store_kernelinfo)(struct aiocb *ujob, long jobref);
326 int (*store_aiocb)(struct aiocb **ujobp, struct aiocb *ujob);
327 };
328
329 static TAILQ_HEAD(,aiothreadlist) aio_freeproc; /* (c) Idle daemons */
330 static struct sema aio_newproc_sem;
331 static struct mtx aio_job_mtx;
332 static struct mtx aio_sock_mtx;
333 static TAILQ_HEAD(,aiocblist) aio_jobs; /* (c) Async job list */
334 static struct unrhdr *aiod_unr;
335
336 void aio_init_aioinfo(struct proc *p);
337 static void aio_onceonly(void);
338 static int aio_free_entry(struct aiocblist *aiocbe);
339 static void aio_process(struct aiocblist *aiocbe);
340 static int aio_newproc(int *);
341 int aio_aqueue(struct thread *td, struct aiocb *job,
342 struct aioliojob *lio, int type, struct aiocb_ops *ops);
343 static void aio_physwakeup(struct buf *bp);
344 static void aio_proc_rundown(void *arg, struct proc *p);
345 static void aio_proc_rundown_exec(void *arg, struct proc *p, struct image_params *imgp);
346 static int aio_qphysio(struct proc *p, struct aiocblist *iocb);
347 static void biohelper(void *, int);
348 static void aio_daemon(void *param);
349 static void aio_swake_cb(struct socket *, struct sockbuf *);
350 static int aio_unload(void);
351 static void aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type);
352 #define DONE_BUF 1
353 #define DONE_QUEUE 2
354 static int aio_kick(struct proc *userp);
355 static void aio_kick_nowait(struct proc *userp);
356 static void aio_kick_helper(void *context, int pending);
357 static int filt_aioattach(struct knote *kn);
358 static void filt_aiodetach(struct knote *kn);
359 static int filt_aio(struct knote *kn, long hint);
360 static int filt_lioattach(struct knote *kn);
361 static void filt_liodetach(struct knote *kn);
362 static int filt_lio(struct knote *kn, long hint);
363
364 /*
365 * Zones for:
366 * kaio Per process async io info
367 * aiop async io thread data
368 * aiocb async io jobs
369 * aiol list io job pointer - internal to aio_suspend XXX
370 * aiolio list io jobs
371 */
372 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone;
373
374 /* kqueue filters for aio */
375 static struct filterops aio_filtops =
376 { 0, filt_aioattach, filt_aiodetach, filt_aio };
377 static struct filterops lio_filtops =
378 { 0, filt_lioattach, filt_liodetach, filt_lio };
379
380 static eventhandler_tag exit_tag, exec_tag;
381
382 TASKQUEUE_DEFINE_THREAD(aiod_bio);
383
384 /*
385 * Main operations function for use as a kernel module.
386 */
387 static int
388 aio_modload(struct module *module, int cmd, void *arg)
389 {
390 int error = 0;
391
392 switch (cmd) {
393 case MOD_LOAD:
394 aio_onceonly();
395 break;
396 case MOD_UNLOAD:
397 error = aio_unload();
398 break;
399 case MOD_SHUTDOWN:
400 break;
401 default:
402 error = EINVAL;
403 break;
404 }
405 return (error);
406 }
407
408 static moduledata_t aio_mod = {
409 "aio",
410 &aio_modload,
411 NULL
412 };
413
414 SYSCALL_MODULE_HELPER(aio_cancel);
415 SYSCALL_MODULE_HELPER(aio_error);
416 SYSCALL_MODULE_HELPER(aio_fsync);
417 SYSCALL_MODULE_HELPER(aio_read);
418 SYSCALL_MODULE_HELPER(aio_return);
419 SYSCALL_MODULE_HELPER(aio_suspend);
420 SYSCALL_MODULE_HELPER(aio_waitcomplete);
421 SYSCALL_MODULE_HELPER(aio_write);
422 SYSCALL_MODULE_HELPER(lio_listio);
423 SYSCALL_MODULE_HELPER(oaio_read);
424 SYSCALL_MODULE_HELPER(oaio_write);
425 SYSCALL_MODULE_HELPER(olio_listio);
426
427 DECLARE_MODULE(aio, aio_mod,
428 SI_SUB_VFS, SI_ORDER_ANY);
429 MODULE_VERSION(aio, 1);
430
431 /*
432 * Startup initialization
433 */
434 static void
435 aio_onceonly(void)
436 {
437
438 /* XXX: should probably just use so->callback */
439 aio_swake = &aio_swake_cb;
440 exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL,
441 EVENTHANDLER_PRI_ANY);
442 exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown_exec, NULL,
443 EVENTHANDLER_PRI_ANY);
444 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops);
445 kqueue_add_filteropts(EVFILT_LIO, &lio_filtops);
446 TAILQ_INIT(&aio_freeproc);
447 sema_init(&aio_newproc_sem, 0, "aio_new_proc");
448 mtx_init(&aio_job_mtx, "aio_job", NULL, MTX_DEF);
449 mtx_init(&aio_sock_mtx, "aio_sock", NULL, MTX_DEF);
450 TAILQ_INIT(&aio_jobs);
451 aiod_unr = new_unrhdr(1, INT_MAX, NULL);
452 kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL,
453 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
454 aiop_zone = uma_zcreate("AIOP", sizeof(struct aiothreadlist), NULL,
455 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
456 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct aiocblist), NULL, NULL,
457 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
458 aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL,
459 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
460 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL,
461 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
462 aiod_timeout = AIOD_TIMEOUT_DEFAULT;
463 aiod_lifetime = AIOD_LIFETIME_DEFAULT;
464 jobrefid = 1;
465 async_io_version = _POSIX_VERSION;
466 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX);
467 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE);
468 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0);
469 }
470
471 /*
472 * Callback for unload of AIO when used as a module.
473 */
474 static int
475 aio_unload(void)
476 {
477 int error;
478
479 /*
480 * XXX: no unloads by default, it's too dangerous.
481 * perhaps we could do it if locked out callers and then
482 * did an aio_proc_rundown() on each process.
483 *
484 * jhb: aio_proc_rundown() needs to run on curproc though,
485 * so I don't think that would fly.
486 */
487 if (!unloadable)
488 return (EOPNOTSUPP);
489
490 error = kqueue_del_filteropts(EVFILT_AIO);
491 if (error)
492 return error;
493 error = kqueue_del_filteropts(EVFILT_LIO);
494 if (error)
495 return error;
496 async_io_version = 0;
497 aio_swake = NULL;
498 taskqueue_free(taskqueue_aiod_bio);
499 delete_unrhdr(aiod_unr);
500 uma_zdestroy(kaio_zone);
501 uma_zdestroy(aiop_zone);
502 uma_zdestroy(aiocb_zone);
503 uma_zdestroy(aiol_zone);
504 uma_zdestroy(aiolio_zone);
505 EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
506 EVENTHANDLER_DEREGISTER(process_exec, exec_tag);
507 mtx_destroy(&aio_job_mtx);
508 mtx_destroy(&aio_sock_mtx);
509 sema_destroy(&aio_newproc_sem);
510 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, -1);
511 p31b_setcfg(CTL_P1003_1B_AIO_MAX, -1);
512 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, -1);
513 return (0);
514 }
515
516 /*
517 * Init the per-process aioinfo structure. The aioinfo limits are set
518 * per-process for user limit (resource) management.
519 */
520 void
521 aio_init_aioinfo(struct proc *p)
522 {
523 struct kaioinfo *ki;
524
525 ki = uma_zalloc(kaio_zone, M_WAITOK);
526 mtx_init(&ki->kaio_mtx, "aiomtx", NULL, MTX_DEF);
527 ki->kaio_flags = 0;
528 ki->kaio_maxactive_count = max_aio_per_proc;
529 ki->kaio_active_count = 0;
530 ki->kaio_qallowed_count = max_aio_queue_per_proc;
531 ki->kaio_count = 0;
532 ki->kaio_ballowed_count = max_buf_aio;
533 ki->kaio_buffer_count = 0;
534 TAILQ_INIT(&ki->kaio_all);
535 TAILQ_INIT(&ki->kaio_done);
536 TAILQ_INIT(&ki->kaio_jobqueue);
537 TAILQ_INIT(&ki->kaio_bufqueue);
538 TAILQ_INIT(&ki->kaio_liojoblist);
539 TAILQ_INIT(&ki->kaio_sockqueue);
540 TAILQ_INIT(&ki->kaio_syncqueue);
541 TASK_INIT(&ki->kaio_task, 0, aio_kick_helper, p);
542 PROC_LOCK(p);
543 if (p->p_aioinfo == NULL) {
544 p->p_aioinfo = ki;
545 PROC_UNLOCK(p);
546 } else {
547 PROC_UNLOCK(p);
548 mtx_destroy(&ki->kaio_mtx);
549 uma_zfree(kaio_zone, ki);
550 }
551
552 while (num_aio_procs < target_aio_procs)
553 aio_newproc(NULL);
554 }
555
556 static int
557 aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi)
558 {
559 int ret = 0;
560
561 PROC_LOCK(p);
562 if (!KSI_ONQ(ksi)) {
563 ksi->ksi_code = SI_ASYNCIO;
564 ksi->ksi_flags |= KSI_EXT | KSI_INS;
565 ret = psignal_event(p, sigev, ksi);
566 }
567 PROC_UNLOCK(p);
568 return (ret);
569 }
570
571 /*
572 * Free a job entry. Wait for completion if it is currently active, but don't
573 * delay forever. If we delay, we return a flag that says that we have to
574 * restart the queue scan.
575 */
576 static int
577 aio_free_entry(struct aiocblist *aiocbe)
578 {
579 struct kaioinfo *ki;
580 struct aioliojob *lj;
581 struct proc *p;
582
583 p = aiocbe->userproc;
584 MPASS(curproc == p);
585 ki = p->p_aioinfo;
586 MPASS(ki != NULL);
587
588 AIO_LOCK_ASSERT(ki, MA_OWNED);
589 MPASS(aiocbe->jobstate == JOBST_JOBFINISHED);
590
591 atomic_subtract_int(&num_queue_count, 1);
592
593 ki->kaio_count--;
594 MPASS(ki->kaio_count >= 0);
595
596 TAILQ_REMOVE(&ki->kaio_done, aiocbe, plist);
597 TAILQ_REMOVE(&ki->kaio_all, aiocbe, allist);
598
599 lj = aiocbe->lio;
600 if (lj) {
601 lj->lioj_count--;
602 lj->lioj_finished_count--;
603
604 if (lj->lioj_count == 0) {
605 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
606 /* lio is going away, we need to destroy any knotes */
607 knlist_delete(&lj->klist, curthread, 1);
608 PROC_LOCK(p);
609 sigqueue_take(&lj->lioj_ksi);
610 PROC_UNLOCK(p);
611 uma_zfree(aiolio_zone, lj);
612 }
613 }
614
615 /* aiocbe is going away, we need to destroy any knotes */
616 knlist_delete(&aiocbe->klist, curthread, 1);
617 PROC_LOCK(p);
618 sigqueue_take(&aiocbe->ksi);
619 PROC_UNLOCK(p);
620
621 MPASS(aiocbe->bp == NULL);
622 aiocbe->jobstate = JOBST_NULL;
623 AIO_UNLOCK(ki);
624
625 /*
626 * The thread argument here is used to find the owning process
627 * and is also passed to fo_close() which may pass it to various
628 * places such as devsw close() routines. Because of that, we
629 * need a thread pointer from the process owning the job that is
630 * persistent and won't disappear out from under us or move to
631 * another process.
632 *
633 * Currently, all the callers of this function call it to remove
634 * an aiocblist from the current process' job list either via a
635 * syscall or due to the current process calling exit() or
636 * execve(). Thus, we know that p == curproc. We also know that
637 * curthread can't exit since we are curthread.
638 *
639 * Therefore, we use curthread as the thread to pass to
640 * knlist_delete(). This does mean that it is possible for the
641 * thread pointer at close time to differ from the thread pointer
642 * at open time, but this is already true of file descriptors in
643 * a multithreaded process.
644 */
645 fdrop(aiocbe->fd_file, curthread);
646 crfree(aiocbe->cred);
647 uma_zfree(aiocb_zone, aiocbe);
648 AIO_LOCK(ki);
649
650 return (0);
651 }
652
653 static void
654 aio_proc_rundown_exec(void *arg, struct proc *p, struct image_params *imgp __unused)
655 {
656 aio_proc_rundown(arg, p);
657 }
658
659 /*
660 * Rundown the jobs for a given process.
661 */
662 static void
663 aio_proc_rundown(void *arg, struct proc *p)
664 {
665 struct kaioinfo *ki;
666 struct aioliojob *lj;
667 struct aiocblist *cbe, *cbn;
668 struct file *fp;
669 struct socket *so;
670 int remove;
671
672 KASSERT(curthread->td_proc == p,
673 ("%s: called on non-curproc", __func__));
674 ki = p->p_aioinfo;
675 if (ki == NULL)
676 return;
677
678 AIO_LOCK(ki);
679 ki->kaio_flags |= KAIO_RUNDOWN;
680
681 restart:
682
683 /*
684 * Try to cancel all pending requests. This code simulates
685 * aio_cancel on all pending I/O requests.
686 */
687 TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) {
688 remove = 0;
689 mtx_lock(&aio_job_mtx);
690 if (cbe->jobstate == JOBST_JOBQGLOBAL) {
691 TAILQ_REMOVE(&aio_jobs, cbe, list);
692 remove = 1;
693 } else if (cbe->jobstate == JOBST_JOBQSOCK) {
694 fp = cbe->fd_file;
695 MPASS(fp->f_type == DTYPE_SOCKET);
696 so = fp->f_data;
697 TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
698 remove = 1;
699 } else if (cbe->jobstate == JOBST_JOBQSYNC) {
700 TAILQ_REMOVE(&ki->kaio_syncqueue, cbe, list);
701 remove = 1;
702 }
703 mtx_unlock(&aio_job_mtx);
704
705 if (remove) {
706 cbe->jobstate = JOBST_JOBFINISHED;
707 cbe->uaiocb._aiocb_private.status = -1;
708 cbe->uaiocb._aiocb_private.error = ECANCELED;
709 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
710 aio_bio_done_notify(p, cbe, DONE_QUEUE);
711 }
712 }
713
714 /* Wait for all running I/O to be finished */
715 if (TAILQ_FIRST(&ki->kaio_bufqueue) ||
716 TAILQ_FIRST(&ki->kaio_jobqueue)) {
717 ki->kaio_flags |= KAIO_WAKEUP;
718 msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO, "aioprn", hz);
719 goto restart;
720 }
721
722 /* Free all completed I/O requests. */
723 while ((cbe = TAILQ_FIRST(&ki->kaio_done)) != NULL)
724 aio_free_entry(cbe);
725
726 while ((lj = TAILQ_FIRST(&ki->kaio_liojoblist)) != NULL) {
727 if (lj->lioj_count == 0) {
728 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
729 knlist_delete(&lj->klist, curthread, 1);
730 PROC_LOCK(p);
731 sigqueue_take(&lj->lioj_ksi);
732 PROC_UNLOCK(p);
733 uma_zfree(aiolio_zone, lj);
734 } else {
735 panic("LIO job not cleaned up: C:%d, FC:%d\n",
736 lj->lioj_count, lj->lioj_finished_count);
737 }
738 }
739 AIO_UNLOCK(ki);
740 taskqueue_drain(taskqueue_aiod_bio, &ki->kaio_task);
741 mtx_destroy(&ki->kaio_mtx);
742 uma_zfree(kaio_zone, ki);
743 p->p_aioinfo = NULL;
744 }
745
746 /*
747 * Select a job to run (called by an AIO daemon).
748 */
749 static struct aiocblist *
750 aio_selectjob(struct aiothreadlist *aiop)
751 {
752 struct aiocblist *aiocbe;
753 struct kaioinfo *ki;
754 struct proc *userp;
755
756 mtx_assert(&aio_job_mtx, MA_OWNED);
757 TAILQ_FOREACH(aiocbe, &aio_jobs, list) {
758 userp = aiocbe->userproc;
759 ki = userp->p_aioinfo;
760
761 if (ki->kaio_active_count < ki->kaio_maxactive_count) {
762 TAILQ_REMOVE(&aio_jobs, aiocbe, list);
763 /* Account for currently active jobs. */
764 ki->kaio_active_count++;
765 aiocbe->jobstate = JOBST_JOBRUNNING;
766 break;
767 }
768 }
769 return (aiocbe);
770 }
771
772 /*
773 * Move all data to a permanent storage device, this code
774 * simulates fsync syscall.
775 */
776 static int
777 aio_fsync_vnode(struct thread *td, struct vnode *vp)
778 {
779 struct mount *mp;
780 int vfslocked;
781 int error;
782
783 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
784 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
785 goto drop;
786 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
787 if (vp->v_object != NULL) {
788 VM_OBJECT_LOCK(vp->v_object);
789 vm_object_page_clean(vp->v_object, 0, 0, 0);
790 VM_OBJECT_UNLOCK(vp->v_object);
791 }
792 error = VOP_FSYNC(vp, MNT_WAIT, td);
793
794 VOP_UNLOCK(vp, 0, td);
795 vn_finished_write(mp);
796 drop:
797 VFS_UNLOCK_GIANT(vfslocked);
798 return (error);
799 }
800
801 /*
802 * The AIO processing activity. This is the code that does the I/O request for
803 * the non-physio version of the operations. The normal vn operations are used,
804 * and this code should work in all instances for every type of file, including
805 * pipes, sockets, fifos, and regular files.
806 *
807 * XXX I don't think it works well for socket, pipe, and fifo.
808 */
809 static void
810 aio_process(struct aiocblist *aiocbe)
811 {
812 struct ucred *td_savedcred;
813 struct thread *td;
814 struct aiocb *cb;
815 struct file *fp;
816 struct socket *so;
817 struct uio auio;
818 struct iovec aiov;
819 int cnt;
820 int error;
821 int oublock_st, oublock_end;
822 int inblock_st, inblock_end;
823
824 td = curthread;
825 td_savedcred = td->td_ucred;
826 td->td_ucred = aiocbe->cred;
827 cb = &aiocbe->uaiocb;
828 fp = aiocbe->fd_file;
829
830 if (cb->aio_lio_opcode == LIO_SYNC) {
831 error = 0;
832 cnt = 0;
833 if (fp->f_vnode != NULL)
834 error = aio_fsync_vnode(td, fp->f_vnode);
835 cb->_aiocb_private.error = error;
836 cb->_aiocb_private.status = 0;
837 td->td_ucred = td_savedcred;
838 return;
839 }
840
841 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
842 aiov.iov_len = cb->aio_nbytes;
843
844 auio.uio_iov = &aiov;
845 auio.uio_iovcnt = 1;
846 auio.uio_offset = cb->aio_offset;
847 auio.uio_resid = cb->aio_nbytes;
848 cnt = cb->aio_nbytes;
849 auio.uio_segflg = UIO_USERSPACE;
850 auio.uio_td = td;
851
852 inblock_st = td->td_ru.ru_inblock;
853 oublock_st = td->td_ru.ru_oublock;
854 /*
855 * aio_aqueue() acquires a reference to the file that is
856 * released in aio_free_entry().
857 */
858 if (cb->aio_lio_opcode == LIO_READ) {
859 auio.uio_rw = UIO_READ;
860 if (auio.uio_resid == 0)
861 error = 0;
862 else
863 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td);
864 } else {
865 if (fp->f_type == DTYPE_VNODE)
866 bwillwrite();
867 auio.uio_rw = UIO_WRITE;
868 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td);
869 }
870 inblock_end = td->td_ru.ru_inblock;
871 oublock_end = td->td_ru.ru_oublock;
872
873 aiocbe->inputcharge = inblock_end - inblock_st;
874 aiocbe->outputcharge = oublock_end - oublock_st;
875
876 if ((error) && (auio.uio_resid != cnt)) {
877 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
878 error = 0;
879 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) {
880 int sigpipe = 1;
881 if (fp->f_type == DTYPE_SOCKET) {
882 so = fp->f_data;
883 if (so->so_options & SO_NOSIGPIPE)
884 sigpipe = 0;
885 }
886 if (sigpipe) {
887 PROC_LOCK(aiocbe->userproc);
888 psignal(aiocbe->userproc, SIGPIPE);
889 PROC_UNLOCK(aiocbe->userproc);
890 }
891 }
892 }
893
894 cnt -= auio.uio_resid;
895 cb->_aiocb_private.error = error;
896 cb->_aiocb_private.status = cnt;
897 td->td_ucred = td_savedcred;
898 }
899
900 static void
901 aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type)
902 {
903 struct aioliojob *lj;
904 struct kaioinfo *ki;
905 struct aiocblist *scb, *scbn;
906 int lj_done;
907
908 ki = userp->p_aioinfo;
909 AIO_LOCK_ASSERT(ki, MA_OWNED);
910 lj = aiocbe->lio;
911 lj_done = 0;
912 if (lj) {
913 lj->lioj_finished_count++;
914 if (lj->lioj_count == lj->lioj_finished_count)
915 lj_done = 1;
916 }
917 if (type == DONE_QUEUE) {
918 aiocbe->jobflags |= AIOCBLIST_DONE;
919 } else {
920 aiocbe->jobflags |= AIOCBLIST_BUFDONE;
921 }
922 TAILQ_INSERT_TAIL(&ki->kaio_done, aiocbe, plist);
923 aiocbe->jobstate = JOBST_JOBFINISHED;
924
925 if (ki->kaio_flags & KAIO_RUNDOWN)
926 goto notification_done;
927
928 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
929 aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID)
930 aio_sendsig(userp, &aiocbe->uaiocb.aio_sigevent, &aiocbe->ksi);
931
932 KNOTE_LOCKED(&aiocbe->klist, 1);
933
934 if (lj_done) {
935 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
936 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
937 KNOTE_LOCKED(&lj->klist, 1);
938 }
939 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
940 == LIOJ_SIGNAL
941 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
942 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
943 aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi);
944 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
945 }
946 }
947
948 notification_done:
949 if (aiocbe->jobflags & AIOCBLIST_CHECKSYNC) {
950 TAILQ_FOREACH_SAFE(scb, &ki->kaio_syncqueue, list, scbn) {
951 if (aiocbe->fd_file == scb->fd_file &&
952 aiocbe->seqno < scb->seqno) {
953 if (--scb->pending == 0) {
954 mtx_lock(&aio_job_mtx);
955 scb->jobstate = JOBST_JOBQGLOBAL;
956 TAILQ_REMOVE(&ki->kaio_syncqueue, scb, list);
957 TAILQ_INSERT_TAIL(&aio_jobs, scb, list);
958 aio_kick_nowait(userp);
959 mtx_unlock(&aio_job_mtx);
960 }
961 }
962 }
963 }
964 if (ki->kaio_flags & KAIO_WAKEUP) {
965 ki->kaio_flags &= ~KAIO_WAKEUP;
966 wakeup(&userp->p_aioinfo);
967 }
968 }
969
970 /*
971 * The AIO daemon, most of the actual work is done in aio_process,
972 * but the setup (and address space mgmt) is done in this routine.
973 */
974 static void
975 aio_daemon(void *_id)
976 {
977 struct aiocblist *aiocbe;
978 struct aiothreadlist *aiop;
979 struct kaioinfo *ki;
980 struct proc *curcp, *mycp, *userp;
981 struct vmspace *myvm, *tmpvm;
982 struct thread *td = curthread;
983 int id = (intptr_t)_id;
984
985 /*
986 * Local copies of curproc (cp) and vmspace (myvm)
987 */
988 mycp = td->td_proc;
989 myvm = mycp->p_vmspace;
990
991 KASSERT(mycp->p_textvp == NULL, ("kthread has a textvp"));
992
993 /*
994 * Allocate and ready the aio control info. There is one aiop structure
995 * per daemon.
996 */
997 aiop = uma_zalloc(aiop_zone, M_WAITOK);
998 aiop->aiothread = td;
999 aiop->aiothreadflags = 0;
1000
1001 /* The daemon resides in its own pgrp. */
1002 setsid(td, NULL);
1003
1004 /*
1005 * Wakeup parent process. (Parent sleeps to keep from blasting away
1006 * and creating too many daemons.)
1007 */
1008 sema_post(&aio_newproc_sem);
1009
1010 mtx_lock(&aio_job_mtx);
1011 for (;;) {
1012 /*
1013 * curcp is the current daemon process context.
1014 * userp is the current user process context.
1015 */
1016 curcp = mycp;
1017
1018 /*
1019 * Take daemon off of free queue
1020 */
1021 if (aiop->aiothreadflags & AIOP_FREE) {
1022 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1023 aiop->aiothreadflags &= ~AIOP_FREE;
1024 }
1025
1026 /*
1027 * Check for jobs.
1028 */
1029 while ((aiocbe = aio_selectjob(aiop)) != NULL) {
1030 mtx_unlock(&aio_job_mtx);
1031 userp = aiocbe->userproc;
1032
1033 /*
1034 * Connect to process address space for user program.
1035 */
1036 if (userp != curcp) {
1037 /*
1038 * Save the current address space that we are
1039 * connected to.
1040 */
1041 tmpvm = mycp->p_vmspace;
1042
1043 /*
1044 * Point to the new user address space, and
1045 * refer to it.
1046 */
1047 mycp->p_vmspace = userp->p_vmspace;
1048 atomic_add_int(&mycp->p_vmspace->vm_refcnt, 1);
1049
1050 /* Activate the new mapping. */
1051 pmap_activate(FIRST_THREAD_IN_PROC(mycp));
1052
1053 /*
1054 * If the old address space wasn't the daemons
1055 * own address space, then we need to remove the
1056 * daemon's reference from the other process
1057 * that it was acting on behalf of.
1058 */
1059 if (tmpvm != myvm) {
1060 vmspace_free(tmpvm);
1061 }
1062 curcp = userp;
1063 }
1064
1065 ki = userp->p_aioinfo;
1066
1067 /* Do the I/O function. */
1068 aio_process(aiocbe);
1069
1070 mtx_lock(&aio_job_mtx);
1071 /* Decrement the active job count. */
1072 ki->kaio_active_count--;
1073 mtx_unlock(&aio_job_mtx);
1074
1075 AIO_LOCK(ki);
1076 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
1077 aio_bio_done_notify(userp, aiocbe, DONE_QUEUE);
1078 AIO_UNLOCK(ki);
1079
1080 mtx_lock(&aio_job_mtx);
1081 }
1082
1083 /*
1084 * Disconnect from user address space.
1085 */
1086 if (curcp != mycp) {
1087
1088 mtx_unlock(&aio_job_mtx);
1089
1090 /* Get the user address space to disconnect from. */
1091 tmpvm = mycp->p_vmspace;
1092
1093 /* Get original address space for daemon. */
1094 mycp->p_vmspace = myvm;
1095
1096 /* Activate the daemon's address space. */
1097 pmap_activate(FIRST_THREAD_IN_PROC(mycp));
1098 #ifdef DIAGNOSTIC
1099 if (tmpvm == myvm) {
1100 printf("AIOD: vmspace problem -- %d\n",
1101 mycp->p_pid);
1102 }
1103 #endif
1104 /* Remove our vmspace reference. */
1105 vmspace_free(tmpvm);
1106
1107 curcp = mycp;
1108
1109 mtx_lock(&aio_job_mtx);
1110 /*
1111 * We have to restart to avoid race, we only sleep if
1112 * no job can be selected, that should be
1113 * curcp == mycp.
1114 */
1115 continue;
1116 }
1117
1118 mtx_assert(&aio_job_mtx, MA_OWNED);
1119
1120 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
1121 aiop->aiothreadflags |= AIOP_FREE;
1122
1123 /*
1124 * If daemon is inactive for a long time, allow it to exit,
1125 * thereby freeing resources.
1126 */
1127 if (msleep(aiop->aiothread, &aio_job_mtx, PRIBIO, "aiordy",
1128 aiod_lifetime)) {
1129 if (TAILQ_EMPTY(&aio_jobs)) {
1130 if ((aiop->aiothreadflags & AIOP_FREE) &&
1131 (num_aio_procs > target_aio_procs)) {
1132 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1133 num_aio_procs--;
1134 mtx_unlock(&aio_job_mtx);
1135 uma_zfree(aiop_zone, aiop);
1136 free_unr(aiod_unr, id);
1137 #ifdef DIAGNOSTIC
1138 if (mycp->p_vmspace->vm_refcnt <= 1) {
1139 printf("AIOD: bad vm refcnt for"
1140 " exiting daemon: %d\n",
1141 mycp->p_vmspace->vm_refcnt);
1142 }
1143 #endif
1144 kthread_exit(0);
1145 }
1146 }
1147 }
1148 }
1149 mtx_unlock(&aio_job_mtx);
1150 panic("shouldn't be here\n");
1151 }
1152
1153 /*
1154 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
1155 * AIO daemon modifies its environment itself.
1156 */
1157 static int
1158 aio_newproc(int *start)
1159 {
1160 int error;
1161 struct proc *p;
1162 int id;
1163
1164 id = alloc_unr(aiod_unr);
1165 error = kthread_create(aio_daemon, (void *)(intptr_t)id, &p,
1166 RFNOWAIT, 0, "aiod%d", id);
1167 if (error == 0) {
1168 /*
1169 * Wait until daemon is started.
1170 */
1171 sema_wait(&aio_newproc_sem);
1172 mtx_lock(&aio_job_mtx);
1173 num_aio_procs++;
1174 if (start != NULL)
1175 (*start)--;
1176 mtx_unlock(&aio_job_mtx);
1177 } else {
1178 free_unr(aiod_unr, id);
1179 }
1180 return (error);
1181 }
1182
1183 /*
1184 * Try the high-performance, low-overhead physio method for eligible
1185 * VCHR devices. This method doesn't use an aio helper thread, and
1186 * thus has very low overhead.
1187 *
1188 * Assumes that the caller, aio_aqueue(), has incremented the file
1189 * structure's reference count, preventing its deallocation for the
1190 * duration of this call.
1191 */
1192 static int
1193 aio_qphysio(struct proc *p, struct aiocblist *aiocbe)
1194 {
1195 struct aiocb *cb;
1196 struct file *fp;
1197 struct buf *bp;
1198 struct vnode *vp;
1199 struct kaioinfo *ki;
1200 struct aioliojob *lj;
1201 int error;
1202
1203 cb = &aiocbe->uaiocb;
1204 fp = aiocbe->fd_file;
1205
1206 if (fp->f_type != DTYPE_VNODE)
1207 return (-1);
1208
1209 vp = fp->f_vnode;
1210
1211 /*
1212 * If its not a disk, we don't want to return a positive error.
1213 * It causes the aio code to not fall through to try the thread
1214 * way when you're talking to a regular file.
1215 */
1216 if (!vn_isdisk(vp, &error)) {
1217 if (error == ENOTBLK)
1218 return (-1);
1219 else
1220 return (error);
1221 }
1222
1223 if (vp->v_bufobj.bo_bsize == 0)
1224 return (-1);
1225
1226 if (cb->aio_nbytes % vp->v_bufobj.bo_bsize)
1227 return (-1);
1228
1229 if (cb->aio_nbytes > vp->v_rdev->si_iosize_max)
1230 return (-1);
1231
1232 if (cb->aio_nbytes >
1233 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK))
1234 return (-1);
1235
1236 ki = p->p_aioinfo;
1237 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count)
1238 return (-1);
1239
1240 /* Create and build a buffer header for a transfer. */
1241 bp = (struct buf *)getpbuf(NULL);
1242 BUF_KERNPROC(bp);
1243
1244 AIO_LOCK(ki);
1245 ki->kaio_count++;
1246 ki->kaio_buffer_count++;
1247 lj = aiocbe->lio;
1248 if (lj)
1249 lj->lioj_count++;
1250 AIO_UNLOCK(ki);
1251
1252 /*
1253 * Get a copy of the kva from the physical buffer.
1254 */
1255 error = 0;
1256
1257 bp->b_bcount = cb->aio_nbytes;
1258 bp->b_bufsize = cb->aio_nbytes;
1259 bp->b_iodone = aio_physwakeup;
1260 bp->b_saveaddr = bp->b_data;
1261 bp->b_data = (void *)(uintptr_t)cb->aio_buf;
1262 bp->b_offset = cb->aio_offset;
1263 bp->b_iooffset = cb->aio_offset;
1264 bp->b_blkno = btodb(cb->aio_offset);
1265 bp->b_iocmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ;
1266
1267 /*
1268 * Bring buffer into kernel space.
1269 */
1270 if (vmapbuf(bp) < 0) {
1271 error = EFAULT;
1272 goto doerror;
1273 }
1274
1275 AIO_LOCK(ki);
1276 aiocbe->bp = bp;
1277 bp->b_caller1 = (void *)aiocbe;
1278 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist);
1279 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
1280 aiocbe->jobstate = JOBST_JOBQBUF;
1281 cb->_aiocb_private.status = cb->aio_nbytes;
1282 AIO_UNLOCK(ki);
1283
1284 atomic_add_int(&num_queue_count, 1);
1285 atomic_add_int(&num_buf_aio, 1);
1286
1287 bp->b_error = 0;
1288
1289 TASK_INIT(&aiocbe->biotask, 0, biohelper, aiocbe);
1290
1291 /* Perform transfer. */
1292 dev_strategy(vp->v_rdev, bp);
1293 return (0);
1294
1295 doerror:
1296 AIO_LOCK(ki);
1297 ki->kaio_count--;
1298 ki->kaio_buffer_count--;
1299 if (lj)
1300 lj->lioj_count--;
1301 aiocbe->bp = NULL;
1302 AIO_UNLOCK(ki);
1303 relpbuf(bp, NULL);
1304 return (error);
1305 }
1306
1307 /*
1308 * Wake up aio requests that may be serviceable now.
1309 */
1310 static void
1311 aio_swake_cb(struct socket *so, struct sockbuf *sb)
1312 {
1313 struct aiocblist *cb, *cbn;
1314 int opcode;
1315
1316 if (sb == &so->so_snd)
1317 opcode = LIO_WRITE;
1318 else
1319 opcode = LIO_READ;
1320
1321 SOCKBUF_LOCK(sb);
1322 sb->sb_flags &= ~SB_AIO;
1323 mtx_lock(&aio_job_mtx);
1324 TAILQ_FOREACH_SAFE(cb, &so->so_aiojobq, list, cbn) {
1325 if (opcode == cb->uaiocb.aio_lio_opcode) {
1326 if (cb->jobstate != JOBST_JOBQSOCK)
1327 panic("invalid queue value");
1328 /* XXX
1329 * We don't have actual sockets backend yet,
1330 * so we simply move the requests to the generic
1331 * file I/O backend.
1332 */
1333 TAILQ_REMOVE(&so->so_aiojobq, cb, list);
1334 TAILQ_INSERT_TAIL(&aio_jobs, cb, list);
1335 aio_kick_nowait(cb->userproc);
1336 }
1337 }
1338 mtx_unlock(&aio_job_mtx);
1339 SOCKBUF_UNLOCK(sb);
1340 }
1341
1342 static int
1343 convert_old_sigevent(struct osigevent *osig, struct sigevent *nsig)
1344 {
1345
1346 /*
1347 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are
1348 * supported by AIO with the old sigevent structure.
1349 */
1350 nsig->sigev_notify = osig->sigev_notify;
1351 switch (nsig->sigev_notify) {
1352 case SIGEV_NONE:
1353 break;
1354 case SIGEV_SIGNAL:
1355 nsig->sigev_signo = osig->__sigev_u.__sigev_signo;
1356 break;
1357 case SIGEV_KEVENT:
1358 nsig->sigev_notify_kqueue =
1359 osig->__sigev_u.__sigev_notify_kqueue;
1360 nsig->sigev_value.sival_ptr = osig->sigev_value.sival_ptr;
1361 break;
1362 default:
1363 return (EINVAL);
1364 }
1365 return (0);
1366 }
1367
1368 static int
1369 aiocb_copyin_old_sigevent(struct aiocb *ujob, struct aiocb *kjob)
1370 {
1371 struct oaiocb *ojob;
1372 int error;
1373
1374 bzero(kjob, sizeof(struct aiocb));
1375 error = copyin(ujob, kjob, sizeof(struct oaiocb));
1376 if (error)
1377 return (error);
1378 ojob = (struct oaiocb *)kjob;
1379 return (convert_old_sigevent(&ojob->aio_sigevent, &kjob->aio_sigevent));
1380 }
1381
1382 static int
1383 aiocb_copyin(struct aiocb *ujob, struct aiocb *kjob)
1384 {
1385
1386 return (copyin(ujob, kjob, sizeof(struct aiocb)));
1387 }
1388
1389 static long
1390 aiocb_fetch_status(struct aiocb *ujob)
1391 {
1392
1393 return (fuword(&ujob->_aiocb_private.status));
1394 }
1395
1396 static long
1397 aiocb_fetch_error(struct aiocb *ujob)
1398 {
1399
1400 return (fuword(&ujob->_aiocb_private.error));
1401 }
1402
1403 static int
1404 aiocb_store_status(struct aiocb *ujob, long status)
1405 {
1406
1407 return (suword(&ujob->_aiocb_private.status, status));
1408 }
1409
1410 static int
1411 aiocb_store_error(struct aiocb *ujob, long error)
1412 {
1413
1414 return (suword(&ujob->_aiocb_private.error, error));
1415 }
1416
1417 static int
1418 aiocb_store_kernelinfo(struct aiocb *ujob, long jobref)
1419 {
1420
1421 return (suword(&ujob->_aiocb_private.kernelinfo, jobref));
1422 }
1423
1424 static int
1425 aiocb_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob)
1426 {
1427
1428 return (suword(ujobp, (long)ujob));
1429 }
1430
1431 static struct aiocb_ops aiocb_ops = {
1432 .copyin = aiocb_copyin,
1433 .fetch_status = aiocb_fetch_status,
1434 .fetch_error = aiocb_fetch_error,
1435 .store_status = aiocb_store_status,
1436 .store_error = aiocb_store_error,
1437 .store_kernelinfo = aiocb_store_kernelinfo,
1438 .store_aiocb = aiocb_store_aiocb,
1439 };
1440
1441 static struct aiocb_ops aiocb_ops_osigevent = {
1442 .copyin = aiocb_copyin_old_sigevent,
1443 .fetch_status = aiocb_fetch_status,
1444 .fetch_error = aiocb_fetch_error,
1445 .store_status = aiocb_store_status,
1446 .store_error = aiocb_store_error,
1447 .store_kernelinfo = aiocb_store_kernelinfo,
1448 .store_aiocb = aiocb_store_aiocb,
1449 };
1450
1451 /*
1452 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR
1453 * technique is done in this code.
1454 */
1455 int
1456 aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
1457 int type, struct aiocb_ops *ops)
1458 {
1459 struct proc *p = td->td_proc;
1460 struct file *fp;
1461 struct socket *so;
1462 struct aiocblist *aiocbe, *cb;
1463 struct kaioinfo *ki;
1464 struct kevent kev;
1465 struct sockbuf *sb;
1466 int opcode;
1467 int error;
1468 int fd, kqfd;
1469 int jid;
1470
1471 if (p->p_aioinfo == NULL)
1472 aio_init_aioinfo(p);
1473
1474 ki = p->p_aioinfo;
1475
1476 ops->store_status(job, -1);
1477 ops->store_error(job, 0);
1478 ops->store_kernelinfo(job, -1);
1479
1480 if (num_queue_count >= max_queue_count ||
1481 ki->kaio_count >= ki->kaio_qallowed_count) {
1482 ops->store_error(job, EAGAIN);
1483 return (EAGAIN);
1484 }
1485
1486 aiocbe = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO);
1487 aiocbe->inputcharge = 0;
1488 aiocbe->outputcharge = 0;
1489 knlist_init_mtx(&aiocbe->klist, AIO_MTX(ki));
1490
1491 error = ops->copyin(job, &aiocbe->uaiocb);
1492 if (error) {
1493 ops->store_error(job, error);
1494 uma_zfree(aiocb_zone, aiocbe);
1495 return (error);
1496 }
1497
1498 if (aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT &&
1499 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL &&
1500 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID &&
1501 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) {
1502 ops->store_error(job, EINVAL);
1503 uma_zfree(aiocb_zone, aiocbe);
1504 return (EINVAL);
1505 }
1506
1507 if ((aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
1508 aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) &&
1509 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) {
1510 uma_zfree(aiocb_zone, aiocbe);
1511 return (EINVAL);
1512 }
1513
1514 ksiginfo_init(&aiocbe->ksi);
1515
1516 /* Save userspace address of the job info. */
1517 aiocbe->uuaiocb = job;
1518
1519 /* Get the opcode. */
1520 if (type != LIO_NOP)
1521 aiocbe->uaiocb.aio_lio_opcode = type;
1522 opcode = aiocbe->uaiocb.aio_lio_opcode;
1523
1524 /* Fetch the file object for the specified file descriptor. */
1525 fd = aiocbe->uaiocb.aio_fildes;
1526 switch (opcode) {
1527 case LIO_WRITE:
1528 error = fget_write(td, fd, &fp);
1529 break;
1530 case LIO_READ:
1531 error = fget_read(td, fd, &fp);
1532 break;
1533 default:
1534 error = fget(td, fd, &fp);
1535 }
1536 if (error) {
1537 uma_zfree(aiocb_zone, aiocbe);
1538 ops->store_error(job, error);
1539 return (error);
1540 }
1541
1542 if (opcode == LIO_SYNC && fp->f_vnode == NULL) {
1543 error = EINVAL;
1544 goto aqueue_fail;
1545 }
1546
1547 if (opcode != LIO_SYNC && aiocbe->uaiocb.aio_offset == -1LL) {
1548 error = EINVAL;
1549 goto aqueue_fail;
1550 }
1551
1552 aiocbe->fd_file = fp;
1553
1554 mtx_lock(&aio_job_mtx);
1555 jid = jobrefid++;
1556 aiocbe->seqno = jobseqno++;
1557 mtx_unlock(&aio_job_mtx);
1558 error = ops->store_kernelinfo(job, jid);
1559 if (error) {
1560 error = EINVAL;
1561 goto aqueue_fail;
1562 }
1563 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid;
1564
1565 if (opcode == LIO_NOP) {
1566 fdrop(fp, td);
1567 uma_zfree(aiocb_zone, aiocbe);
1568 return (0);
1569 }
1570 if ((opcode != LIO_READ) && (opcode != LIO_WRITE) &&
1571 (opcode != LIO_SYNC)) {
1572 error = EINVAL;
1573 goto aqueue_fail;
1574 }
1575
1576 if (aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT)
1577 goto no_kqueue;
1578 kqfd = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue;
1579 kev.ident = (uintptr_t)aiocbe->uuaiocb;
1580 kev.filter = EVFILT_AIO;
1581 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
1582 kev.data = (intptr_t)aiocbe;
1583 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sival_ptr;
1584 error = kqfd_register(kqfd, &kev, td, 1);
1585 aqueue_fail:
1586 if (error) {
1587 fdrop(fp, td);
1588 uma_zfree(aiocb_zone, aiocbe);
1589 ops->store_error(job, error);
1590 goto done;
1591 }
1592 no_kqueue:
1593
1594 ops->store_error(job, EINPROGRESS);
1595 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS;
1596 aiocbe->userproc = p;
1597 aiocbe->cred = crhold(td->td_ucred);
1598 aiocbe->jobflags = 0;
1599 aiocbe->lio = lj;
1600
1601 if (opcode == LIO_SYNC)
1602 goto queueit;
1603
1604 if (fp->f_type == DTYPE_SOCKET) {
1605 /*
1606 * Alternate queueing for socket ops: Reach down into the
1607 * descriptor to get the socket data. Then check to see if the
1608 * socket is ready to be read or written (based on the requested
1609 * operation).
1610 *
1611 * If it is not ready for io, then queue the aiocbe on the
1612 * socket, and set the flags so we get a call when sbnotify()
1613 * happens.
1614 *
1615 * Note if opcode is neither LIO_WRITE nor LIO_READ we lock
1616 * and unlock the snd sockbuf for no reason.
1617 */
1618 so = fp->f_data;
1619 sb = (opcode == LIO_READ) ? &so->so_rcv : &so->so_snd;
1620 SOCKBUF_LOCK(sb);
1621 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode ==
1622 LIO_WRITE) && (!sowriteable(so)))) {
1623 sb->sb_flags |= SB_AIO;
1624
1625 mtx_lock(&aio_job_mtx);
1626 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list);
1627 mtx_unlock(&aio_job_mtx);
1628
1629 AIO_LOCK(ki);
1630 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
1631 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
1632 aiocbe->jobstate = JOBST_JOBQSOCK;
1633 ki->kaio_count++;
1634 if (lj)
1635 lj->lioj_count++;
1636 AIO_UNLOCK(ki);
1637 SOCKBUF_UNLOCK(sb);
1638 atomic_add_int(&num_queue_count, 1);
1639 error = 0;
1640 goto done;
1641 }
1642 SOCKBUF_UNLOCK(sb);
1643 }
1644
1645 if ((error = aio_qphysio(p, aiocbe)) == 0)
1646 goto done;
1647 #if 0
1648 if (error > 0) {
1649 aiocbe->uaiocb._aiocb_private.error = error;
1650 ops->store_error(job, error);
1651 goto done;
1652 }
1653 #endif
1654 queueit:
1655 /* No buffer for daemon I/O. */
1656 aiocbe->bp = NULL;
1657 atomic_add_int(&num_queue_count, 1);
1658
1659 AIO_LOCK(ki);
1660 ki->kaio_count++;
1661 if (lj)
1662 lj->lioj_count++;
1663 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
1664 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
1665 if (opcode == LIO_SYNC) {
1666 TAILQ_FOREACH(cb, &ki->kaio_jobqueue, plist) {
1667 if (cb->fd_file == aiocbe->fd_file &&
1668 cb->uaiocb.aio_lio_opcode != LIO_SYNC &&
1669 cb->seqno < aiocbe->seqno) {
1670 cb->jobflags |= AIOCBLIST_CHECKSYNC;
1671 aiocbe->pending++;
1672 }
1673 }
1674 TAILQ_FOREACH(cb, &ki->kaio_bufqueue, plist) {
1675 if (cb->fd_file == aiocbe->fd_file &&
1676 cb->uaiocb.aio_lio_opcode != LIO_SYNC &&
1677 cb->seqno < aiocbe->seqno) {
1678 cb->jobflags |= AIOCBLIST_CHECKSYNC;
1679 aiocbe->pending++;
1680 }
1681 }
1682 if (aiocbe->pending != 0) {
1683 TAILQ_INSERT_TAIL(&ki->kaio_syncqueue, aiocbe, list);
1684 aiocbe->jobstate = JOBST_JOBQSYNC;
1685 AIO_UNLOCK(ki);
1686 goto done;
1687 }
1688 }
1689 mtx_lock(&aio_job_mtx);
1690 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
1691 aiocbe->jobstate = JOBST_JOBQGLOBAL;
1692 aio_kick_nowait(p);
1693 mtx_unlock(&aio_job_mtx);
1694 AIO_UNLOCK(ki);
1695 error = 0;
1696 done:
1697 return (error);
1698 }
1699
1700 static void
1701 aio_kick_nowait(struct proc *userp)
1702 {
1703 struct kaioinfo *ki = userp->p_aioinfo;
1704 struct aiothreadlist *aiop;
1705
1706 mtx_assert(&aio_job_mtx, MA_OWNED);
1707 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1708 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1709 aiop->aiothreadflags &= ~AIOP_FREE;
1710 wakeup(aiop->aiothread);
1711 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
1712 ((ki->kaio_active_count + num_aio_resv_start) <
1713 ki->kaio_maxactive_count)) {
1714 taskqueue_enqueue(taskqueue_aiod_bio, &ki->kaio_task);
1715 }
1716 }
1717
1718 static int
1719 aio_kick(struct proc *userp)
1720 {
1721 struct kaioinfo *ki = userp->p_aioinfo;
1722 struct aiothreadlist *aiop;
1723 int error, ret = 0;
1724
1725 mtx_assert(&aio_job_mtx, MA_OWNED);
1726 retryproc:
1727 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1728 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1729 aiop->aiothreadflags &= ~AIOP_FREE;
1730 wakeup(aiop->aiothread);
1731 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
1732 ((ki->kaio_active_count + num_aio_resv_start) <
1733 ki->kaio_maxactive_count)) {
1734 num_aio_resv_start++;
1735 mtx_unlock(&aio_job_mtx);
1736 error = aio_newproc(&num_aio_resv_start);
1737 mtx_lock(&aio_job_mtx);
1738 if (error) {
1739 num_aio_resv_start--;
1740 goto retryproc;
1741 }
1742 } else {
1743 ret = -1;
1744 }
1745 return (ret);
1746 }
1747
1748 static void
1749 aio_kick_helper(void *context, int pending)
1750 {
1751 struct proc *userp = context;
1752
1753 mtx_lock(&aio_job_mtx);
1754 while (--pending >= 0) {
1755 if (aio_kick(userp))
1756 break;
1757 }
1758 mtx_unlock(&aio_job_mtx);
1759 }
1760
1761 /*
1762 * Support the aio_return system call, as a side-effect, kernel resources are
1763 * released.
1764 */
1765 static int
1766 kern_aio_return(struct thread *td, struct aiocb *uaiocb, struct aiocb_ops *ops)
1767 {
1768 struct proc *p = td->td_proc;
1769 struct aiocblist *cb;
1770 struct kaioinfo *ki;
1771 int status, error;
1772
1773 ki = p->p_aioinfo;
1774 if (ki == NULL)
1775 return (EINVAL);
1776 AIO_LOCK(ki);
1777 TAILQ_FOREACH(cb, &ki->kaio_done, plist) {
1778 if (cb->uuaiocb == uaiocb)
1779 break;
1780 }
1781 if (cb != NULL) {
1782 MPASS(cb->jobstate == JOBST_JOBFINISHED);
1783 status = cb->uaiocb._aiocb_private.status;
1784 error = cb->uaiocb._aiocb_private.error;
1785 td->td_retval[0] = status;
1786 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
1787 td->td_ru.ru_oublock += cb->outputcharge;
1788 cb->outputcharge = 0;
1789 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
1790 td->td_ru.ru_inblock += cb->inputcharge;
1791 cb->inputcharge = 0;
1792 }
1793 aio_free_entry(cb);
1794 AIO_UNLOCK(ki);
1795 ops->store_error(uaiocb, error);
1796 ops->store_status(uaiocb, status);
1797 } else {
1798 error = EINVAL;
1799 AIO_UNLOCK(ki);
1800 }
1801 return (error);
1802 }
1803
1804 int
1805 aio_return(struct thread *td, struct aio_return_args *uap)
1806 {
1807
1808 return (kern_aio_return(td, uap->aiocbp, &aiocb_ops));
1809 }
1810
1811 /*
1812 * Allow a process to wakeup when any of the I/O requests are completed.
1813 */
1814 static int
1815 kern_aio_suspend(struct thread *td, int njoblist, struct aiocb **ujoblist,
1816 struct timespec *ts)
1817 {
1818 struct proc *p = td->td_proc;
1819 struct timeval atv;
1820 struct kaioinfo *ki;
1821 struct aiocblist *cb, *cbfirst;
1822 int error, i, timo;
1823
1824 timo = 0;
1825 if (ts) {
1826 if (ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
1827 return (EINVAL);
1828
1829 TIMESPEC_TO_TIMEVAL(&atv, ts);
1830 if (itimerfix(&atv))
1831 return (EINVAL);
1832 timo = tvtohz(&atv);
1833 }
1834
1835 ki = p->p_aioinfo;
1836 if (ki == NULL)
1837 return (EAGAIN);
1838
1839 if (njoblist == 0)
1840 return (0);
1841
1842 AIO_LOCK(ki);
1843 for (;;) {
1844 cbfirst = NULL;
1845 error = 0;
1846 TAILQ_FOREACH(cb, &ki->kaio_all, allist) {
1847 for (i = 0; i < njoblist; i++) {
1848 if (cb->uuaiocb == ujoblist[i]) {
1849 if (cbfirst == NULL)
1850 cbfirst = cb;
1851 if (cb->jobstate == JOBST_JOBFINISHED)
1852 goto RETURN;
1853 }
1854 }
1855 }
1856 /* All tasks were finished. */
1857 if (cbfirst == NULL)
1858 break;
1859
1860 ki->kaio_flags |= KAIO_WAKEUP;
1861 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
1862 "aiospn", timo);
1863 if (error == ERESTART)
1864 error = EINTR;
1865 if (error)
1866 break;
1867 }
1868 RETURN:
1869 AIO_UNLOCK(ki);
1870 return (error);
1871 }
1872
1873 int
1874 aio_suspend(struct thread *td, struct aio_suspend_args *uap)
1875 {
1876 struct timespec ts, *tsp;
1877 struct aiocb **ujoblist;
1878 int error;
1879
1880 if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX)
1881 return (EINVAL);
1882
1883 if (uap->timeout) {
1884 /* Get timespec struct. */
1885 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
1886 return (error);
1887 tsp = &ts;
1888 } else
1889 tsp = NULL;
1890
1891 ujoblist = uma_zalloc(aiol_zone, M_WAITOK);
1892 error = copyin(uap->aiocbp, ujoblist, uap->nent * sizeof(ujoblist[0]));
1893 if (error == 0)
1894 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp);
1895 uma_zfree(aiol_zone, ujoblist);
1896 return (error);
1897 }
1898
1899 /*
1900 * aio_cancel cancels any non-physio aio operations not currently in
1901 * progress.
1902 */
1903 int
1904 aio_cancel(struct thread *td, struct aio_cancel_args *uap)
1905 {
1906 struct proc *p = td->td_proc;
1907 struct kaioinfo *ki;
1908 struct aiocblist *cbe, *cbn;
1909 struct file *fp;
1910 struct socket *so;
1911 int error;
1912 int remove;
1913 int cancelled = 0;
1914 int notcancelled = 0;
1915 struct vnode *vp;
1916
1917 /* Lookup file object. */
1918 error = fget(td, uap->fd, &fp);
1919 if (error)
1920 return (error);
1921
1922 ki = p->p_aioinfo;
1923 if (ki == NULL)
1924 goto done;
1925
1926 if (fp->f_type == DTYPE_VNODE) {
1927 vp = fp->f_vnode;
1928 if (vn_isdisk(vp, &error)) {
1929 fdrop(fp, td);
1930 td->td_retval[0] = AIO_NOTCANCELED;
1931 return (0);
1932 }
1933 }
1934
1935 AIO_LOCK(ki);
1936 TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) {
1937 if ((uap->fd == cbe->uaiocb.aio_fildes) &&
1938 ((uap->aiocbp == NULL) ||
1939 (uap->aiocbp == cbe->uuaiocb))) {
1940 remove = 0;
1941
1942 mtx_lock(&aio_job_mtx);
1943 if (cbe->jobstate == JOBST_JOBQGLOBAL) {
1944 TAILQ_REMOVE(&aio_jobs, cbe, list);
1945 remove = 1;
1946 } else if (cbe->jobstate == JOBST_JOBQSOCK) {
1947 MPASS(fp->f_type == DTYPE_SOCKET);
1948 so = fp->f_data;
1949 TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
1950 remove = 1;
1951 } else if (cbe->jobstate == JOBST_JOBQSYNC) {
1952 TAILQ_REMOVE(&ki->kaio_syncqueue, cbe, list);
1953 remove = 1;
1954 }
1955 mtx_unlock(&aio_job_mtx);
1956
1957 if (remove) {
1958 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
1959 cbe->uaiocb._aiocb_private.status = -1;
1960 cbe->uaiocb._aiocb_private.error = ECANCELED;
1961 aio_bio_done_notify(p, cbe, DONE_QUEUE);
1962 cancelled++;
1963 } else {
1964 notcancelled++;
1965 }
1966 if (uap->aiocbp != NULL)
1967 break;
1968 }
1969 }
1970 AIO_UNLOCK(ki);
1971
1972 done:
1973 fdrop(fp, td);
1974
1975 if (uap->aiocbp != NULL) {
1976 if (cancelled) {
1977 td->td_retval[0] = AIO_CANCELED;
1978 return (0);
1979 }
1980 }
1981
1982 if (notcancelled) {
1983 td->td_retval[0] = AIO_NOTCANCELED;
1984 return (0);
1985 }
1986
1987 if (cancelled) {
1988 td->td_retval[0] = AIO_CANCELED;
1989 return (0);
1990 }
1991
1992 td->td_retval[0] = AIO_ALLDONE;
1993
1994 return (0);
1995 }
1996
1997 /*
1998 * aio_error is implemented in the kernel level for compatibility purposes
1999 * only. For a user mode async implementation, it would be best to do it in
2000 * a userland subroutine.
2001 */
2002 static int
2003 kern_aio_error(struct thread *td, struct aiocb *aiocbp, struct aiocb_ops *ops)
2004 {
2005 struct proc *p = td->td_proc;
2006 struct aiocblist *cb;
2007 struct kaioinfo *ki;
2008 int status;
2009
2010 ki = p->p_aioinfo;
2011 if (ki == NULL) {
2012 td->td_retval[0] = EINVAL;
2013 return (0);
2014 }
2015
2016 AIO_LOCK(ki);
2017 TAILQ_FOREACH(cb, &ki->kaio_all, allist) {
2018 if (cb->uuaiocb == aiocbp) {
2019 if (cb->jobstate == JOBST_JOBFINISHED)
2020 td->td_retval[0] =
2021 cb->uaiocb._aiocb_private.error;
2022 else
2023 td->td_retval[0] = EINPROGRESS;
2024 AIO_UNLOCK(ki);
2025 return (0);
2026 }
2027 }
2028 AIO_UNLOCK(ki);
2029
2030 /*
2031 * Hack for failure of aio_aqueue.
2032 */
2033 status = ops->fetch_status(aiocbp);
2034 if (status == -1) {
2035 td->td_retval[0] = ops->fetch_error(aiocbp);
2036 return (0);
2037 }
2038
2039 td->td_retval[0] = EINVAL;
2040 return (0);
2041 }
2042
2043 int
2044 aio_error(struct thread *td, struct aio_error_args *uap)
2045 {
2046
2047 return (kern_aio_error(td, uap->aiocbp, &aiocb_ops));
2048 }
2049
2050 /* syscall - asynchronous read from a file (REALTIME) */
2051 int
2052 oaio_read(struct thread *td, struct oaio_read_args *uap)
2053 {
2054
2055 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
2056 &aiocb_ops_osigevent));
2057 }
2058
2059 int
2060 aio_read(struct thread *td, struct aio_read_args *uap)
2061 {
2062
2063 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, &aiocb_ops));
2064 }
2065
2066 /* syscall - asynchronous write to a file (REALTIME) */
2067 int
2068 oaio_write(struct thread *td, struct oaio_write_args *uap)
2069 {
2070
2071 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
2072 &aiocb_ops_osigevent));
2073 }
2074
2075 int
2076 aio_write(struct thread *td, struct aio_write_args *uap)
2077 {
2078
2079 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, &aiocb_ops));
2080 }
2081
2082 static int
2083 kern_lio_listio(struct thread *td, int mode, struct aiocb * const *uacb_list,
2084 struct aiocb **acb_list, int nent, struct sigevent *sig,
2085 struct aiocb_ops *ops)
2086 {
2087 struct proc *p = td->td_proc;
2088 struct aiocb *iocb;
2089 struct kaioinfo *ki;
2090 struct aioliojob *lj;
2091 struct kevent kev;
2092 int error;
2093 int nerror;
2094 int i;
2095
2096 if ((mode != LIO_NOWAIT) && (mode != LIO_WAIT))
2097 return (EINVAL);
2098
2099 if (nent < 0 || nent > AIO_LISTIO_MAX)
2100 return (EINVAL);
2101
2102 if (p->p_aioinfo == NULL)
2103 aio_init_aioinfo(p);
2104
2105 ki = p->p_aioinfo;
2106
2107 lj = uma_zalloc(aiolio_zone, M_WAITOK);
2108 lj->lioj_flags = 0;
2109 lj->lioj_count = 0;
2110 lj->lioj_finished_count = 0;
2111 knlist_init_mtx(&lj->klist, AIO_MTX(ki));
2112 ksiginfo_init(&lj->lioj_ksi);
2113
2114 /*
2115 * Setup signal.
2116 */
2117 if (sig && (mode == LIO_NOWAIT)) {
2118 bcopy(sig, &lj->lioj_signal, sizeof(lj->lioj_signal));
2119 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
2120 /* Assume only new style KEVENT */
2121 kev.filter = EVFILT_LIO;
2122 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
2123 kev.ident = (uintptr_t)uacb_list; /* something unique */
2124 kev.data = (intptr_t)lj;
2125 /* pass user defined sigval data */
2126 kev.udata = lj->lioj_signal.sigev_value.sival_ptr;
2127 error = kqfd_register(
2128 lj->lioj_signal.sigev_notify_kqueue, &kev, td, 1);
2129 if (error) {
2130 uma_zfree(aiolio_zone, lj);
2131 return (error);
2132 }
2133 } else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) {
2134 ;
2135 } else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
2136 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) {
2137 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
2138 uma_zfree(aiolio_zone, lj);
2139 return EINVAL;
2140 }
2141 lj->lioj_flags |= LIOJ_SIGNAL;
2142 } else {
2143 uma_zfree(aiolio_zone, lj);
2144 return EINVAL;
2145 }
2146 }
2147
2148 AIO_LOCK(ki);
2149 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
2150 /*
2151 * Add extra aiocb count to avoid the lio to be freed
2152 * by other threads doing aio_waitcomplete or aio_return,
2153 * and prevent event from being sent until we have queued
2154 * all tasks.
2155 */
2156 lj->lioj_count = 1;
2157 AIO_UNLOCK(ki);
2158
2159 /*
2160 * Get pointers to the list of I/O requests.
2161 */
2162 nerror = 0;
2163 for (i = 0; i < nent; i++) {
2164 iocb = acb_list[i];
2165 if (iocb != NULL) {
2166 error = aio_aqueue(td, iocb, lj, LIO_NOP, ops);
2167 if (error != 0)
2168 nerror++;
2169 }
2170 }
2171
2172 error = 0;
2173 AIO_LOCK(ki);
2174 if (mode == LIO_WAIT) {
2175 while (lj->lioj_count - 1 != lj->lioj_finished_count) {
2176 ki->kaio_flags |= KAIO_WAKEUP;
2177 error = msleep(&p->p_aioinfo, AIO_MTX(ki),
2178 PRIBIO | PCATCH, "aiospn", 0);
2179 if (error == ERESTART)
2180 error = EINTR;
2181 if (error)
2182 break;
2183 }
2184 } else {
2185 if (lj->lioj_count - 1 == lj->lioj_finished_count) {
2186 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
2187 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
2188 KNOTE_LOCKED(&lj->klist, 1);
2189 }
2190 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
2191 == LIOJ_SIGNAL
2192 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
2193 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
2194 aio_sendsig(p, &lj->lioj_signal,
2195 &lj->lioj_ksi);
2196 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
2197 }
2198 }
2199 }
2200 lj->lioj_count--;
2201 if (lj->lioj_count == 0) {
2202 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
2203 knlist_delete(&lj->klist, curthread, 1);
2204 PROC_LOCK(p);
2205 sigqueue_take(&lj->lioj_ksi);
2206 PROC_UNLOCK(p);
2207 AIO_UNLOCK(ki);
2208 uma_zfree(aiolio_zone, lj);
2209 } else
2210 AIO_UNLOCK(ki);
2211
2212 if (nerror)
2213 return (EIO);
2214 return (error);
2215 }
2216
2217 /* syscall - list directed I/O (REALTIME) */
2218 int
2219 olio_listio(struct thread *td, struct olio_listio_args *uap)
2220 {
2221 struct aiocb **acb_list;
2222 struct sigevent *sigp, sig;
2223 struct osigevent osig;
2224 int error, nent;
2225
2226 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
2227 return (EINVAL);
2228
2229 nent = uap->nent;
2230 if (nent < 0 || nent > AIO_LISTIO_MAX)
2231 return (EINVAL);
2232
2233 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2234 error = copyin(uap->sig, &osig, sizeof(osig));
2235 if (error)
2236 return (error);
2237 error = convert_old_sigevent(&osig, &sig);
2238 if (error)
2239 return (error);
2240 sigp = &sig;
2241 } else
2242 sigp = NULL;
2243
2244 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
2245 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0]));
2246 if (error == 0)
2247 error = kern_lio_listio(td, uap->mode,
2248 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
2249 &aiocb_ops_osigevent);
2250 free(acb_list, M_LIO);
2251 return (error);
2252 }
2253
2254 /* syscall - list directed I/O (REALTIME) */
2255 int
2256 lio_listio(struct thread *td, struct lio_listio_args *uap)
2257 {
2258 struct aiocb **acb_list;
2259 struct sigevent *sigp, sig;
2260 int error, nent;
2261
2262 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
2263 return (EINVAL);
2264
2265 nent = uap->nent;
2266 if (nent < 0 || nent > AIO_LISTIO_MAX)
2267 return (EINVAL);
2268
2269 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2270 error = copyin(uap->sig, &sig, sizeof(sig));
2271 if (error)
2272 return (error);
2273 sigp = &sig;
2274 } else
2275 sigp = NULL;
2276
2277 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
2278 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0]));
2279 if (error == 0)
2280 error = kern_lio_listio(td, uap->mode, uap->acb_list, acb_list,
2281 nent, sigp, &aiocb_ops);
2282 free(acb_list, M_LIO);
2283 return (error);
2284 }
2285
2286 /*
2287 * Called from interrupt thread for physio, we should return as fast
2288 * as possible, so we schedule a biohelper task.
2289 */
2290 static void
2291 aio_physwakeup(struct buf *bp)
2292 {
2293 struct aiocblist *aiocbe;
2294
2295 aiocbe = (struct aiocblist *)bp->b_caller1;
2296 taskqueue_enqueue(taskqueue_aiod_bio, &aiocbe->biotask);
2297 }
2298
2299 /*
2300 * Task routine to perform heavy tasks, process wakeup, and signals.
2301 */
2302 static void
2303 biohelper(void *context, int pending)
2304 {
2305 struct aiocblist *aiocbe = context;
2306 struct buf *bp;
2307 struct proc *userp;
2308 struct kaioinfo *ki;
2309 int nblks;
2310
2311 bp = aiocbe->bp;
2312 userp = aiocbe->userproc;
2313 ki = userp->p_aioinfo;
2314 AIO_LOCK(ki);
2315 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid;
2316 aiocbe->uaiocb._aiocb_private.error = 0;
2317 if (bp->b_ioflags & BIO_ERROR)
2318 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
2319 nblks = btodb(aiocbe->uaiocb.aio_nbytes);
2320 if (aiocbe->uaiocb.aio_lio_opcode == LIO_WRITE)
2321 aiocbe->outputcharge += nblks;
2322 else
2323 aiocbe->inputcharge += nblks;
2324 aiocbe->bp = NULL;
2325 TAILQ_REMOVE(&userp->p_aioinfo->kaio_bufqueue, aiocbe, plist);
2326 ki->kaio_buffer_count--;
2327 aio_bio_done_notify(userp, aiocbe, DONE_BUF);
2328 AIO_UNLOCK(ki);
2329
2330 /* Release mapping into kernel space. */
2331 vunmapbuf(bp);
2332 relpbuf(bp, NULL);
2333 atomic_subtract_int(&num_buf_aio, 1);
2334 }
2335
2336 /* syscall - wait for the next completion of an aio request */
2337 static int
2338 kern_aio_waitcomplete(struct thread *td, struct aiocb **aiocbp,
2339 struct timespec *ts, struct aiocb_ops *ops)
2340 {
2341 struct proc *p = td->td_proc;
2342 struct timeval atv;
2343 struct kaioinfo *ki;
2344 struct aiocblist *cb;
2345 struct aiocb *uuaiocb;
2346 int error, status, timo;
2347
2348 ops->store_aiocb(aiocbp, NULL);
2349
2350 timo = 0;
2351 if (ts) {
2352 if ((ts->tv_nsec < 0) || (ts->tv_nsec >= 1000000000))
2353 return (EINVAL);
2354
2355 TIMESPEC_TO_TIMEVAL(&atv, ts);
2356 if (itimerfix(&atv))
2357 return (EINVAL);
2358 timo = tvtohz(&atv);
2359 }
2360
2361 if (p->p_aioinfo == NULL)
2362 aio_init_aioinfo(p);
2363 ki = p->p_aioinfo;
2364
2365 error = 0;
2366 cb = NULL;
2367 AIO_LOCK(ki);
2368 while ((cb = TAILQ_FIRST(&ki->kaio_done)) == NULL) {
2369 ki->kaio_flags |= KAIO_WAKEUP;
2370 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
2371 "aiowc", timo);
2372 if (timo && error == ERESTART)
2373 error = EINTR;
2374 if (error)
2375 break;
2376 }
2377
2378 if (cb != NULL) {
2379 MPASS(cb->jobstate == JOBST_JOBFINISHED);
2380 uuaiocb = cb->uuaiocb;
2381 status = cb->uaiocb._aiocb_private.status;
2382 error = cb->uaiocb._aiocb_private.error;
2383 td->td_retval[0] = status;
2384 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
2385 td->td_ru.ru_oublock += cb->outputcharge;
2386 cb->outputcharge = 0;
2387 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
2388 td->td_ru.ru_inblock += cb->inputcharge;
2389 cb->inputcharge = 0;
2390 }
2391 aio_free_entry(cb);
2392 AIO_UNLOCK(ki);
2393 ops->store_aiocb(aiocbp, uuaiocb);
2394 ops->store_error(uuaiocb, error);
2395 ops->store_status(uuaiocb, status);
2396 } else
2397 AIO_UNLOCK(ki);
2398
2399 return (error);
2400 }
2401
2402 int
2403 aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap)
2404 {
2405 struct timespec ts, *tsp;
2406 int error;
2407
2408 if (uap->timeout) {
2409 /* Get timespec struct. */
2410 error = copyin(uap->timeout, &ts, sizeof(ts));
2411 if (error)
2412 return (error);
2413 tsp = &ts;
2414 } else
2415 tsp = NULL;
2416
2417 return (kern_aio_waitcomplete(td, uap->aiocbp, tsp, &aiocb_ops));
2418 }
2419
2420 static int
2421 kern_aio_fsync(struct thread *td, int op, struct aiocb *aiocbp,
2422 struct aiocb_ops *ops)
2423 {
2424 struct proc *p = td->td_proc;
2425 struct kaioinfo *ki;
2426
2427 if (op != O_SYNC) /* XXX lack of O_DSYNC */
2428 return (EINVAL);
2429 ki = p->p_aioinfo;
2430 if (ki == NULL)
2431 aio_init_aioinfo(p);
2432 return (aio_aqueue(td, aiocbp, NULL, LIO_SYNC, ops));
2433 }
2434
2435 int
2436 aio_fsync(struct thread *td, struct aio_fsync_args *uap)
2437 {
2438
2439 return (kern_aio_fsync(td, uap->op, uap->aiocbp, &aiocb_ops));
2440 }
2441
2442 /* kqueue attach function */
2443 static int
2444 filt_aioattach(struct knote *kn)
2445 {
2446 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2447
2448 /*
2449 * The aiocbe pointer must be validated before using it, so
2450 * registration is restricted to the kernel; the user cannot
2451 * set EV_FLAG1.
2452 */
2453 if ((kn->kn_flags & EV_FLAG1) == 0)
2454 return (EPERM);
2455 kn->kn_ptr.p_aio = aiocbe;
2456 kn->kn_flags &= ~EV_FLAG1;
2457
2458 knlist_add(&aiocbe->klist, kn, 0);
2459
2460 return (0);
2461 }
2462
2463 /* kqueue detach function */
2464 static void
2465 filt_aiodetach(struct knote *kn)
2466 {
2467 struct aiocblist *aiocbe = kn->kn_ptr.p_aio;
2468
2469 if (!knlist_empty(&aiocbe->klist))
2470 knlist_remove(&aiocbe->klist, kn, 0);
2471 }
2472
2473 /* kqueue filter function */
2474 /*ARGSUSED*/
2475 static int
2476 filt_aio(struct knote *kn, long hint)
2477 {
2478 struct aiocblist *aiocbe = kn->kn_ptr.p_aio;
2479
2480 kn->kn_data = aiocbe->uaiocb._aiocb_private.error;
2481 if (aiocbe->jobstate != JOBST_JOBFINISHED)
2482 return (0);
2483 kn->kn_flags |= EV_EOF;
2484 return (1);
2485 }
2486
2487 /* kqueue attach function */
2488 static int
2489 filt_lioattach(struct knote *kn)
2490 {
2491 struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata;
2492
2493 /*
2494 * The aioliojob pointer must be validated before using it, so
2495 * registration is restricted to the kernel; the user cannot
2496 * set EV_FLAG1.
2497 */
2498 if ((kn->kn_flags & EV_FLAG1) == 0)
2499 return (EPERM);
2500 kn->kn_ptr.p_lio = lj;
2501 kn->kn_flags &= ~EV_FLAG1;
2502
2503 knlist_add(&lj->klist, kn, 0);
2504
2505 return (0);
2506 }
2507
2508 /* kqueue detach function */
2509 static void
2510 filt_liodetach(struct knote *kn)
2511 {
2512 struct aioliojob * lj = kn->kn_ptr.p_lio;
2513
2514 if (!knlist_empty(&lj->klist))
2515 knlist_remove(&lj->klist, kn, 0);
2516 }
2517
2518 /* kqueue filter function */
2519 /*ARGSUSED*/
2520 static int
2521 filt_lio(struct knote *kn, long hint)
2522 {
2523 struct aioliojob * lj = kn->kn_ptr.p_lio;
2524
2525 return (lj->lioj_flags & LIOJ_KEVENT_POSTED);
2526 }
2527
2528 #ifdef COMPAT_IA32
2529 #include <sys/mount.h>
2530 #include <sys/socket.h>
2531 #include <compat/freebsd32/freebsd32.h>
2532 #include <compat/freebsd32/freebsd32_proto.h>
2533 #include <compat/freebsd32/freebsd32_signal.h>
2534 #include <compat/freebsd32/freebsd32_syscall.h>
2535 #include <compat/freebsd32/freebsd32_util.h>
2536
2537 struct __aiocb_private32 {
2538 int32_t status;
2539 int32_t error;
2540 uint32_t kernelinfo;
2541 };
2542
2543 typedef struct oaiocb32 {
2544 int aio_fildes; /* File descriptor */
2545 uint64_t aio_offset __packed; /* File offset for I/O */
2546 uint32_t aio_buf; /* I/O buffer in process space */
2547 uint32_t aio_nbytes; /* Number of bytes for I/O */
2548 struct osigevent32 aio_sigevent; /* Signal to deliver */
2549 int aio_lio_opcode; /* LIO opcode */
2550 int aio_reqprio; /* Request priority -- ignored */
2551 struct __aiocb_private32 _aiocb_private;
2552 } oaiocb32_t;
2553
2554 typedef struct aiocb32 {
2555 int32_t aio_fildes; /* File descriptor */
2556 uint64_t aio_offset __packed; /* File offset for I/O */
2557 uint32_t aio_buf; /* I/O buffer in process space */
2558 uint32_t aio_nbytes; /* Number of bytes for I/O */
2559 int __spare__[2];
2560 uint32_t __spare2__;
2561 int aio_lio_opcode; /* LIO opcode */
2562 int aio_reqprio; /* Request priority -- ignored */
2563 struct __aiocb_private32 _aiocb_private;
2564 struct sigevent32 aio_sigevent; /* Signal to deliver */
2565 } aiocb32_t;
2566
2567 static int
2568 convert_old_sigevent32(struct osigevent32 *osig, struct sigevent *nsig)
2569 {
2570
2571 /*
2572 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are
2573 * supported by AIO with the old sigevent structure.
2574 */
2575 CP(*osig, *nsig, sigev_notify);
2576 switch (nsig->sigev_notify) {
2577 case SIGEV_NONE:
2578 break;
2579 case SIGEV_SIGNAL:
2580 nsig->sigev_signo = osig->__sigev_u.__sigev_signo;
2581 break;
2582 case SIGEV_KEVENT:
2583 nsig->sigev_notify_kqueue =
2584 osig->__sigev_u.__sigev_notify_kqueue;
2585 PTRIN_CP(*osig, *nsig, sigev_value.sival_ptr);
2586 break;
2587 default:
2588 return (EINVAL);
2589 }
2590 return (0);
2591 }
2592
2593 static int
2594 aiocb32_copyin_old_sigevent(struct aiocb *ujob, struct aiocb *kjob)
2595 {
2596 struct oaiocb32 job32;
2597 int error;
2598
2599 bzero(kjob, sizeof(struct aiocb));
2600 error = copyin(ujob, &job32, sizeof(job32));
2601 if (error)
2602 return (error);
2603
2604 CP(job32, *kjob, aio_fildes);
2605 CP(job32, *kjob, aio_offset);
2606 PTRIN_CP(job32, *kjob, aio_buf);
2607 CP(job32, *kjob, aio_nbytes);
2608 CP(job32, *kjob, aio_lio_opcode);
2609 CP(job32, *kjob, aio_reqprio);
2610 CP(job32, *kjob, _aiocb_private.status);
2611 CP(job32, *kjob, _aiocb_private.error);
2612 PTRIN_CP(job32, *kjob, _aiocb_private.kernelinfo);
2613 return (convert_old_sigevent32(&job32.aio_sigevent,
2614 &kjob->aio_sigevent));
2615 }
2616
2617 static int
2618 convert_sigevent32(struct sigevent32 *sig32, struct sigevent *sig)
2619 {
2620
2621 CP(*sig32, *sig, sigev_notify);
2622 switch (sig->sigev_notify) {
2623 case SIGEV_NONE:
2624 break;
2625 case SIGEV_THREAD_ID:
2626 CP(*sig32, *sig, sigev_notify_thread_id);
2627 /* FALLTHROUGH */
2628 case SIGEV_SIGNAL:
2629 CP(*sig32, *sig, sigev_signo);
2630 break;
2631 case SIGEV_KEVENT:
2632 CP(*sig32, *sig, sigev_notify_kqueue);
2633 PTRIN_CP(*sig32, *sig, sigev_value.sival_ptr);
2634 break;
2635 default:
2636 return (EINVAL);
2637 }
2638 return (0);
2639 }
2640
2641 static int
2642 aiocb32_copyin(struct aiocb *ujob, struct aiocb *kjob)
2643 {
2644 struct aiocb32 job32;
2645 int error;
2646
2647 error = copyin(ujob, &job32, sizeof(job32));
2648 if (error)
2649 return (error);
2650 CP(job32, *kjob, aio_fildes);
2651 CP(job32, *kjob, aio_offset);
2652 PTRIN_CP(job32, *kjob, aio_buf);
2653 CP(job32, *kjob, aio_nbytes);
2654 CP(job32, *kjob, aio_lio_opcode);
2655 CP(job32, *kjob, aio_reqprio);
2656 CP(job32, *kjob, _aiocb_private.status);
2657 CP(job32, *kjob, _aiocb_private.error);
2658 PTRIN_CP(job32, *kjob, _aiocb_private.kernelinfo);
2659 return (convert_sigevent32(&job32.aio_sigevent, &kjob->aio_sigevent));
2660 }
2661
2662 static long
2663 aiocb32_fetch_status(struct aiocb *ujob)
2664 {
2665 struct aiocb32 *ujob32;
2666
2667 ujob32 = (struct aiocb32 *)ujob;
2668 return (fuword32(&ujob32->_aiocb_private.status));
2669 }
2670
2671 static long
2672 aiocb32_fetch_error(struct aiocb *ujob)
2673 {
2674 struct aiocb32 *ujob32;
2675
2676 ujob32 = (struct aiocb32 *)ujob;
2677 return (fuword32(&ujob32->_aiocb_private.error));
2678 }
2679
2680 static int
2681 aiocb32_store_status(struct aiocb *ujob, long status)
2682 {
2683 struct aiocb32 *ujob32;
2684
2685 ujob32 = (struct aiocb32 *)ujob;
2686 return (suword32(&ujob32->_aiocb_private.status, status));
2687 }
2688
2689 static int
2690 aiocb32_store_error(struct aiocb *ujob, long error)
2691 {
2692 struct aiocb32 *ujob32;
2693
2694 ujob32 = (struct aiocb32 *)ujob;
2695 return (suword32(&ujob32->_aiocb_private.error, error));
2696 }
2697
2698 static int
2699 aiocb32_store_kernelinfo(struct aiocb *ujob, long jobref)
2700 {
2701 struct aiocb32 *ujob32;
2702
2703 ujob32 = (struct aiocb32 *)ujob;
2704 return (suword32(&ujob32->_aiocb_private.kernelinfo, jobref));
2705 }
2706
2707 static int
2708 aiocb32_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob)
2709 {
2710
2711 return (suword32(ujobp, (long)ujob));
2712 }
2713
2714 static struct aiocb_ops aiocb32_ops = {
2715 .copyin = aiocb32_copyin,
2716 .fetch_status = aiocb32_fetch_status,
2717 .fetch_error = aiocb32_fetch_error,
2718 .store_status = aiocb32_store_status,
2719 .store_error = aiocb32_store_error,
2720 .store_kernelinfo = aiocb32_store_kernelinfo,
2721 .store_aiocb = aiocb32_store_aiocb,
2722 };
2723
2724 static struct aiocb_ops aiocb32_ops_osigevent = {
2725 .copyin = aiocb32_copyin_old_sigevent,
2726 .fetch_status = aiocb32_fetch_status,
2727 .fetch_error = aiocb32_fetch_error,
2728 .store_status = aiocb32_store_status,
2729 .store_error = aiocb32_store_error,
2730 .store_kernelinfo = aiocb32_store_kernelinfo,
2731 .store_aiocb = aiocb32_store_aiocb,
2732 };
2733
2734 int
2735 freebsd32_aio_return(struct thread *td, struct freebsd32_aio_return_args *uap)
2736 {
2737
2738 return (kern_aio_return(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops));
2739 }
2740
2741 int
2742 freebsd32_aio_suspend(struct thread *td, struct freebsd32_aio_suspend_args *uap)
2743 {
2744 struct timespec32 ts32;
2745 struct timespec ts, *tsp;
2746 struct aiocb **ujoblist;
2747 uint32_t *ujoblist32;
2748 int error, i;
2749
2750 if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX)
2751 return (EINVAL);
2752
2753 if (uap->timeout) {
2754 /* Get timespec struct. */
2755 if ((error = copyin(uap->timeout, &ts32, sizeof(ts32))) != 0)
2756 return (error);
2757 CP(ts32, ts, tv_sec);
2758 CP(ts32, ts, tv_nsec);
2759 tsp = &ts;
2760 } else
2761 tsp = NULL;
2762
2763 ujoblist = uma_zalloc(aiol_zone, M_WAITOK);
2764 ujoblist32 = (uint32_t *)ujoblist;
2765 error = copyin(uap->aiocbp, ujoblist32, uap->nent *
2766 sizeof(ujoblist32[0]));
2767 if (error == 0) {
2768 for (i = uap->nent; i > 0; i--)
2769 ujoblist[i] = PTRIN(ujoblist32[i]);
2770
2771 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp);
2772 }
2773 uma_zfree(aiol_zone, ujoblist);
2774 return (error);
2775 }
2776
2777 int
2778 freebsd32_aio_cancel(struct thread *td, struct freebsd32_aio_cancel_args *uap)
2779 {
2780
2781 return (aio_cancel(td, (struct aio_cancel_args *)uap));
2782 }
2783
2784 int
2785 freebsd32_aio_error(struct thread *td, struct freebsd32_aio_error_args *uap)
2786 {
2787
2788 return (kern_aio_error(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops));
2789 }
2790
2791 int
2792 freebsd32_oaio_read(struct thread *td, struct freebsd32_oaio_read_args *uap)
2793 {
2794
2795 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
2796 &aiocb32_ops_osigevent));
2797 }
2798
2799 int
2800 freebsd32_aio_read(struct thread *td, struct freebsd32_aio_read_args *uap)
2801 {
2802
2803 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
2804 &aiocb32_ops));
2805 }
2806
2807 int
2808 freebsd32_oaio_write(struct thread *td, struct freebsd32_oaio_write_args *uap)
2809 {
2810
2811 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
2812 &aiocb32_ops_osigevent));
2813 }
2814
2815 int
2816 freebsd32_aio_write(struct thread *td, struct freebsd32_aio_write_args *uap)
2817 {
2818
2819 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
2820 &aiocb32_ops));
2821 }
2822
2823 int
2824 freebsd32_aio_waitcomplete(struct thread *td,
2825 struct freebsd32_aio_waitcomplete_args *uap)
2826 {
2827 struct timespec32 ts32;
2828 struct timespec ts, *tsp;
2829 int error;
2830
2831 if (uap->timeout) {
2832 /* Get timespec struct. */
2833 error = copyin(uap->timeout, &ts32, sizeof(ts32));
2834 if (error)
2835 return (error);
2836 CP(ts32, ts, tv_sec);
2837 CP(ts32, ts, tv_nsec);
2838 tsp = &ts;
2839 } else
2840 tsp = NULL;
2841
2842 return (kern_aio_waitcomplete(td, (struct aiocb **)uap->aiocbp, tsp,
2843 &aiocb32_ops));
2844 }
2845
2846 int
2847 freebsd32_aio_fsync(struct thread *td, struct freebsd32_aio_fsync_args *uap)
2848 {
2849
2850 return (kern_aio_fsync(td, uap->op, (struct aiocb *)uap->aiocbp,
2851 &aiocb32_ops));
2852 }
2853
2854 int
2855 freebsd32_olio_listio(struct thread *td, struct freebsd32_olio_listio_args *uap)
2856 {
2857 struct aiocb **acb_list;
2858 struct sigevent *sigp, sig;
2859 struct osigevent32 osig;
2860 uint32_t *acb_list32;
2861 int error, i, nent;
2862
2863 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
2864 return (EINVAL);
2865
2866 nent = uap->nent;
2867 if (nent < 0 || nent > AIO_LISTIO_MAX)
2868 return (EINVAL);
2869
2870 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2871 error = copyin(uap->sig, &osig, sizeof(osig));
2872 if (error)
2873 return (error);
2874 error = convert_old_sigevent32(&osig, &sig);
2875 if (error)
2876 return (error);
2877 sigp = &sig;
2878 } else
2879 sigp = NULL;
2880
2881 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK);
2882 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t));
2883 if (error) {
2884 free(acb_list32, M_LIO);
2885 return (error);
2886 }
2887 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
2888 for (i = 0; i < nent; i++)
2889 acb_list[i] = PTRIN(acb_list32[i]);
2890 free(acb_list32, M_LIO);
2891
2892 error = kern_lio_listio(td, uap->mode,
2893 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
2894 &aiocb32_ops_osigevent);
2895 free(acb_list, M_LIO);
2896 return (error);
2897 }
2898
2899 int
2900 freebsd32_lio_listio(struct thread *td, struct freebsd32_lio_listio_args *uap)
2901 {
2902 struct aiocb **acb_list;
2903 struct sigevent *sigp, sig;
2904 struct sigevent32 sig32;
2905 uint32_t *acb_list32;
2906 int error, i, nent;
2907
2908 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
2909 return (EINVAL);
2910
2911 nent = uap->nent;
2912 if (nent < 0 || nent > AIO_LISTIO_MAX)
2913 return (EINVAL);
2914
2915 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2916 error = copyin(uap->sig, &sig32, sizeof(sig32));
2917 if (error)
2918 return (error);
2919 error = convert_sigevent32(&sig32, &sig);
2920 if (error)
2921 return (error);
2922 sigp = &sig;
2923 } else
2924 sigp = NULL;
2925
2926 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK);
2927 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t));
2928 if (error) {
2929 free(acb_list32, M_LIO);
2930 return (error);
2931 }
2932 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
2933 for (i = 0; i < nent; i++)
2934 acb_list[i] = PTRIN(acb_list32[i]);
2935 free(acb_list32, M_LIO);
2936
2937 error = kern_lio_listio(td, uap->mode,
2938 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
2939 &aiocb32_ops);
2940 free(acb_list, M_LIO);
2941 return (error);
2942 }
2943
2944 SYSCALL32_MODULE_HELPER(freebsd32_aio_return);
2945 SYSCALL32_MODULE_HELPER(freebsd32_aio_suspend);
2946 SYSCALL32_MODULE_HELPER(freebsd32_aio_cancel);
2947 SYSCALL32_MODULE_HELPER(freebsd32_aio_error);
2948 SYSCALL32_MODULE_HELPER(freebsd32_aio_fsync);
2949 SYSCALL32_MODULE_HELPER(freebsd32_aio_read);
2950 SYSCALL32_MODULE_HELPER(freebsd32_aio_write);
2951 SYSCALL32_MODULE_HELPER(freebsd32_aio_waitcomplete);
2952 SYSCALL32_MODULE_HELPER(freebsd32_lio_listio);
2953 SYSCALL32_MODULE_HELPER(freebsd32_oaio_read);
2954 SYSCALL32_MODULE_HELPER(freebsd32_oaio_write);
2955 SYSCALL32_MODULE_HELPER(freebsd32_olio_listio);
2956 #endif
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