FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_aio.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1997 John S. Dyson. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. John S. Dyson's name may not be used to endorse or promote products
12 * derived from this software without specific prior written permission.
13 *
14 * DISCLAIMER: This code isn't warranted to do anything useful. Anything
15 * bad that happens because of using this software isn't the responsibility
16 * of the author. This software is distributed AS-IS.
17 */
18
19 /*
20 * This file contains support for the POSIX 1003.1B AIO/LIO facility.
21 */
22
23 #include <sys/cdefs.h>
24 __FBSDID("$FreeBSD: releng/12.0/sys/kern/vfs_aio.c 341155 2018-11-28 17:31:34Z markj $");
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/capsicum.h>
32 #include <sys/eventhandler.h>
33 #include <sys/sysproto.h>
34 #include <sys/filedesc.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/kthread.h>
38 #include <sys/fcntl.h>
39 #include <sys/file.h>
40 #include <sys/limits.h>
41 #include <sys/lock.h>
42 #include <sys/mutex.h>
43 #include <sys/unistd.h>
44 #include <sys/posix4.h>
45 #include <sys/proc.h>
46 #include <sys/resourcevar.h>
47 #include <sys/signalvar.h>
48 #include <sys/syscallsubr.h>
49 #include <sys/protosw.h>
50 #include <sys/rwlock.h>
51 #include <sys/sema.h>
52 #include <sys/socket.h>
53 #include <sys/socketvar.h>
54 #include <sys/syscall.h>
55 #include <sys/sysent.h>
56 #include <sys/sysctl.h>
57 #include <sys/syslog.h>
58 #include <sys/sx.h>
59 #include <sys/taskqueue.h>
60 #include <sys/vnode.h>
61 #include <sys/conf.h>
62 #include <sys/event.h>
63 #include <sys/mount.h>
64 #include <geom/geom.h>
65
66 #include <machine/atomic.h>
67
68 #include <vm/vm.h>
69 #include <vm/vm_page.h>
70 #include <vm/vm_extern.h>
71 #include <vm/pmap.h>
72 #include <vm/vm_map.h>
73 #include <vm/vm_object.h>
74 #include <vm/uma.h>
75 #include <sys/aio.h>
76
77 /*
78 * Counter for allocating reference ids to new jobs. Wrapped to 1 on
79 * overflow. (XXX will be removed soon.)
80 */
81 static u_long jobrefid;
82
83 /*
84 * Counter for aio_fsync.
85 */
86 static uint64_t jobseqno;
87
88 #ifndef MAX_AIO_PER_PROC
89 #define MAX_AIO_PER_PROC 32
90 #endif
91
92 #ifndef MAX_AIO_QUEUE_PER_PROC
93 #define MAX_AIO_QUEUE_PER_PROC 256
94 #endif
95
96 #ifndef MAX_AIO_QUEUE
97 #define MAX_AIO_QUEUE 1024 /* Bigger than MAX_AIO_QUEUE_PER_PROC */
98 #endif
99
100 #ifndef MAX_BUF_AIO
101 #define MAX_BUF_AIO 16
102 #endif
103
104 FEATURE(aio, "Asynchronous I/O");
105 SYSCTL_DECL(_p1003_1b);
106
107 static MALLOC_DEFINE(M_LIO, "lio", "listio aio control block list");
108 static MALLOC_DEFINE(M_AIOS, "aios", "aio_suspend aio control block list");
109
110 static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0,
111 "Async IO management");
112
113 static int enable_aio_unsafe = 0;
114 SYSCTL_INT(_vfs_aio, OID_AUTO, enable_unsafe, CTLFLAG_RW, &enable_aio_unsafe, 0,
115 "Permit asynchronous IO on all file types, not just known-safe types");
116
117 static unsigned int unsafe_warningcnt = 1;
118 SYSCTL_UINT(_vfs_aio, OID_AUTO, unsafe_warningcnt, CTLFLAG_RW,
119 &unsafe_warningcnt, 0,
120 "Warnings that will be triggered upon failed IO requests on unsafe files");
121
122 static int max_aio_procs = MAX_AIO_PROCS;
123 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, CTLFLAG_RW, &max_aio_procs, 0,
124 "Maximum number of kernel processes to use for handling async IO ");
125
126 static int num_aio_procs = 0;
127 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, CTLFLAG_RD, &num_aio_procs, 0,
128 "Number of presently active kernel processes for async IO");
129
130 /*
131 * The code will adjust the actual number of AIO processes towards this
132 * number when it gets a chance.
133 */
134 static int target_aio_procs = TARGET_AIO_PROCS;
135 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs,
136 0,
137 "Preferred number of ready kernel processes for async IO");
138
139 static int max_queue_count = MAX_AIO_QUEUE;
140 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0,
141 "Maximum number of aio requests to queue, globally");
142
143 static int num_queue_count = 0;
144 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0,
145 "Number of queued aio requests");
146
147 static int num_buf_aio = 0;
148 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
149 "Number of aio requests presently handled by the buf subsystem");
150
151 static int num_unmapped_aio = 0;
152 SYSCTL_INT(_vfs_aio, OID_AUTO, num_unmapped_aio, CTLFLAG_RD, &num_unmapped_aio,
153 0,
154 "Number of aio requests presently handled by unmapped I/O buffers");
155
156 /* Number of async I/O processes 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_lifetime;
161 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0,
162 "Maximum lifetime for idle aiod");
163
164 static int max_aio_per_proc = MAX_AIO_PER_PROC;
165 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
166 0,
167 "Maximum active aio requests per process");
168
169 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
170 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
171 &max_aio_queue_per_proc, 0,
172 "Maximum queued aio requests per process");
173
174 static int max_buf_aio = MAX_BUF_AIO;
175 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
176 "Maximum buf aio requests per process");
177
178 /*
179 * Though redundant with vfs.aio.max_aio_queue_per_proc, POSIX requires
180 * sysconf(3) to support AIO_LISTIO_MAX, and we implement that with
181 * vfs.aio.aio_listio_max.
182 */
183 SYSCTL_INT(_p1003_1b, CTL_P1003_1B_AIO_LISTIO_MAX, aio_listio_max,
184 CTLFLAG_RD | CTLFLAG_CAPRD, &max_aio_queue_per_proc,
185 0, "Maximum aio requests for a single lio_listio call");
186
187 #ifdef COMPAT_FREEBSD6
188 typedef struct oaiocb {
189 int aio_fildes; /* File descriptor */
190 off_t aio_offset; /* File offset for I/O */
191 volatile void *aio_buf; /* I/O buffer in process space */
192 size_t aio_nbytes; /* Number of bytes for I/O */
193 struct osigevent aio_sigevent; /* Signal to deliver */
194 int aio_lio_opcode; /* LIO opcode */
195 int aio_reqprio; /* Request priority -- ignored */
196 struct __aiocb_private _aiocb_private;
197 } oaiocb_t;
198 #endif
199
200 /*
201 * Below is a key of locks used to protect each member of struct kaiocb
202 * aioliojob and kaioinfo and any backends.
203 *
204 * * - need not protected
205 * a - locked by kaioinfo lock
206 * b - locked by backend lock, the backend lock can be null in some cases,
207 * for example, BIO belongs to this type, in this case, proc lock is
208 * reused.
209 * c - locked by aio_job_mtx, the lock for the generic file I/O backend.
210 */
211
212 /*
213 * If the routine that services an AIO request blocks while running in an
214 * AIO kernel process it can starve other I/O requests. BIO requests
215 * queued via aio_qphysio() complete in GEOM and do not use AIO kernel
216 * processes at all. Socket I/O requests use a separate pool of
217 * kprocs and also force non-blocking I/O. Other file I/O requests
218 * use the generic fo_read/fo_write operations which can block. The
219 * fsync and mlock operations can also block while executing. Ideally
220 * none of these requests would block while executing.
221 *
222 * Note that the service routines cannot toggle O_NONBLOCK in the file
223 * structure directly while handling a request due to races with
224 * userland threads.
225 */
226
227 /* jobflags */
228 #define KAIOCB_QUEUEING 0x01
229 #define KAIOCB_CANCELLED 0x02
230 #define KAIOCB_CANCELLING 0x04
231 #define KAIOCB_CHECKSYNC 0x08
232 #define KAIOCB_CLEARED 0x10
233 #define KAIOCB_FINISHED 0x20
234
235 /*
236 * AIO process info
237 */
238 #define AIOP_FREE 0x1 /* proc on free queue */
239
240 struct aioproc {
241 int aioprocflags; /* (c) AIO proc flags */
242 TAILQ_ENTRY(aioproc) list; /* (c) list of processes */
243 struct proc *aioproc; /* (*) the AIO proc */
244 };
245
246 /*
247 * data-structure for lio signal management
248 */
249 struct aioliojob {
250 int lioj_flags; /* (a) listio flags */
251 int lioj_count; /* (a) listio flags */
252 int lioj_finished_count; /* (a) listio flags */
253 struct sigevent lioj_signal; /* (a) signal on all I/O done */
254 TAILQ_ENTRY(aioliojob) lioj_list; /* (a) lio list */
255 struct knlist klist; /* (a) list of knotes */
256 ksiginfo_t lioj_ksi; /* (a) Realtime signal info */
257 };
258
259 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */
260 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */
261 #define LIOJ_KEVENT_POSTED 0x4 /* kevent triggered */
262
263 /*
264 * per process aio data structure
265 */
266 struct kaioinfo {
267 struct mtx kaio_mtx; /* the lock to protect this struct */
268 int kaio_flags; /* (a) per process kaio flags */
269 int kaio_active_count; /* (c) number of currently used AIOs */
270 int kaio_count; /* (a) size of AIO queue */
271 int kaio_buffer_count; /* (a) number of physio buffers */
272 TAILQ_HEAD(,kaiocb) kaio_all; /* (a) all AIOs in a process */
273 TAILQ_HEAD(,kaiocb) kaio_done; /* (a) done queue for process */
274 TAILQ_HEAD(,aioliojob) kaio_liojoblist; /* (a) list of lio jobs */
275 TAILQ_HEAD(,kaiocb) kaio_jobqueue; /* (a) job queue for process */
276 TAILQ_HEAD(,kaiocb) kaio_syncqueue; /* (a) queue for aio_fsync */
277 TAILQ_HEAD(,kaiocb) kaio_syncready; /* (a) second q for aio_fsync */
278 struct task kaio_task; /* (*) task to kick aio processes */
279 struct task kaio_sync_task; /* (*) task to schedule fsync jobs */
280 };
281
282 #define AIO_LOCK(ki) mtx_lock(&(ki)->kaio_mtx)
283 #define AIO_UNLOCK(ki) mtx_unlock(&(ki)->kaio_mtx)
284 #define AIO_LOCK_ASSERT(ki, f) mtx_assert(&(ki)->kaio_mtx, (f))
285 #define AIO_MTX(ki) (&(ki)->kaio_mtx)
286
287 #define KAIO_RUNDOWN 0x1 /* process is being run down */
288 #define KAIO_WAKEUP 0x2 /* wakeup process when AIO completes */
289
290 /*
291 * Operations used to interact with userland aio control blocks.
292 * Different ABIs provide their own operations.
293 */
294 struct aiocb_ops {
295 int (*copyin)(struct aiocb *ujob, struct aiocb *kjob);
296 long (*fetch_status)(struct aiocb *ujob);
297 long (*fetch_error)(struct aiocb *ujob);
298 int (*store_status)(struct aiocb *ujob, long status);
299 int (*store_error)(struct aiocb *ujob, long error);
300 int (*store_kernelinfo)(struct aiocb *ujob, long jobref);
301 int (*store_aiocb)(struct aiocb **ujobp, struct aiocb *ujob);
302 };
303
304 static TAILQ_HEAD(,aioproc) aio_freeproc; /* (c) Idle daemons */
305 static struct sema aio_newproc_sem;
306 static struct mtx aio_job_mtx;
307 static TAILQ_HEAD(,kaiocb) aio_jobs; /* (c) Async job list */
308 static struct unrhdr *aiod_unr;
309
310 void aio_init_aioinfo(struct proc *p);
311 static int aio_onceonly(void);
312 static int aio_free_entry(struct kaiocb *job);
313 static void aio_process_rw(struct kaiocb *job);
314 static void aio_process_sync(struct kaiocb *job);
315 static void aio_process_mlock(struct kaiocb *job);
316 static void aio_schedule_fsync(void *context, int pending);
317 static int aio_newproc(int *);
318 int aio_aqueue(struct thread *td, struct aiocb *ujob,
319 struct aioliojob *lio, int type, struct aiocb_ops *ops);
320 static int aio_queue_file(struct file *fp, struct kaiocb *job);
321 static void aio_physwakeup(struct bio *bp);
322 static void aio_proc_rundown(void *arg, struct proc *p);
323 static void aio_proc_rundown_exec(void *arg, struct proc *p,
324 struct image_params *imgp);
325 static int aio_qphysio(struct proc *p, struct kaiocb *job);
326 static void aio_daemon(void *param);
327 static void aio_bio_done_notify(struct proc *userp, struct kaiocb *job);
328 static bool aio_clear_cancel_function_locked(struct kaiocb *job);
329 static int aio_kick(struct proc *userp);
330 static void aio_kick_nowait(struct proc *userp);
331 static void aio_kick_helper(void *context, int pending);
332 static int filt_aioattach(struct knote *kn);
333 static void filt_aiodetach(struct knote *kn);
334 static int filt_aio(struct knote *kn, long hint);
335 static int filt_lioattach(struct knote *kn);
336 static void filt_liodetach(struct knote *kn);
337 static int filt_lio(struct knote *kn, long hint);
338
339 /*
340 * Zones for:
341 * kaio Per process async io info
342 * aiop async io process data
343 * aiocb async io jobs
344 * aiolio list io jobs
345 */
346 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiolio_zone;
347
348 /* kqueue filters for aio */
349 static struct filterops aio_filtops = {
350 .f_isfd = 0,
351 .f_attach = filt_aioattach,
352 .f_detach = filt_aiodetach,
353 .f_event = filt_aio,
354 };
355 static struct filterops lio_filtops = {
356 .f_isfd = 0,
357 .f_attach = filt_lioattach,
358 .f_detach = filt_liodetach,
359 .f_event = filt_lio
360 };
361
362 static eventhandler_tag exit_tag, exec_tag;
363
364 TASKQUEUE_DEFINE_THREAD(aiod_kick);
365
366 /*
367 * Main operations function for use as a kernel module.
368 */
369 static int
370 aio_modload(struct module *module, int cmd, void *arg)
371 {
372 int error = 0;
373
374 switch (cmd) {
375 case MOD_LOAD:
376 aio_onceonly();
377 break;
378 case MOD_SHUTDOWN:
379 break;
380 default:
381 error = EOPNOTSUPP;
382 break;
383 }
384 return (error);
385 }
386
387 static moduledata_t aio_mod = {
388 "aio",
389 &aio_modload,
390 NULL
391 };
392
393 DECLARE_MODULE(aio, aio_mod, SI_SUB_VFS, SI_ORDER_ANY);
394 MODULE_VERSION(aio, 1);
395
396 /*
397 * Startup initialization
398 */
399 static int
400 aio_onceonly(void)
401 {
402
403 exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL,
404 EVENTHANDLER_PRI_ANY);
405 exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown_exec,
406 NULL, EVENTHANDLER_PRI_ANY);
407 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops);
408 kqueue_add_filteropts(EVFILT_LIO, &lio_filtops);
409 TAILQ_INIT(&aio_freeproc);
410 sema_init(&aio_newproc_sem, 0, "aio_new_proc");
411 mtx_init(&aio_job_mtx, "aio_job", NULL, MTX_DEF);
412 TAILQ_INIT(&aio_jobs);
413 aiod_unr = new_unrhdr(1, INT_MAX, NULL);
414 kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL,
415 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
416 aiop_zone = uma_zcreate("AIOP", sizeof(struct aioproc), NULL,
417 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
418 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct kaiocb), NULL, NULL,
419 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
420 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL,
421 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
422 aiod_lifetime = AIOD_LIFETIME_DEFAULT;
423 jobrefid = 1;
424 p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, _POSIX_ASYNCHRONOUS_IO);
425 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE);
426 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0);
427
428 return (0);
429 }
430
431 /*
432 * Init the per-process aioinfo structure. The aioinfo limits are set
433 * per-process for user limit (resource) management.
434 */
435 void
436 aio_init_aioinfo(struct proc *p)
437 {
438 struct kaioinfo *ki;
439
440 ki = uma_zalloc(kaio_zone, M_WAITOK);
441 mtx_init(&ki->kaio_mtx, "aiomtx", NULL, MTX_DEF | MTX_NEW);
442 ki->kaio_flags = 0;
443 ki->kaio_active_count = 0;
444 ki->kaio_count = 0;
445 ki->kaio_buffer_count = 0;
446 TAILQ_INIT(&ki->kaio_all);
447 TAILQ_INIT(&ki->kaio_done);
448 TAILQ_INIT(&ki->kaio_jobqueue);
449 TAILQ_INIT(&ki->kaio_liojoblist);
450 TAILQ_INIT(&ki->kaio_syncqueue);
451 TAILQ_INIT(&ki->kaio_syncready);
452 TASK_INIT(&ki->kaio_task, 0, aio_kick_helper, p);
453 TASK_INIT(&ki->kaio_sync_task, 0, aio_schedule_fsync, ki);
454 PROC_LOCK(p);
455 if (p->p_aioinfo == NULL) {
456 p->p_aioinfo = ki;
457 PROC_UNLOCK(p);
458 } else {
459 PROC_UNLOCK(p);
460 mtx_destroy(&ki->kaio_mtx);
461 uma_zfree(kaio_zone, ki);
462 }
463
464 while (num_aio_procs < MIN(target_aio_procs, max_aio_procs))
465 aio_newproc(NULL);
466 }
467
468 static int
469 aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi)
470 {
471 struct thread *td;
472 int error;
473
474 error = sigev_findtd(p, sigev, &td);
475 if (error)
476 return (error);
477 if (!KSI_ONQ(ksi)) {
478 ksiginfo_set_sigev(ksi, sigev);
479 ksi->ksi_code = SI_ASYNCIO;
480 ksi->ksi_flags |= KSI_EXT | KSI_INS;
481 tdsendsignal(p, td, ksi->ksi_signo, ksi);
482 }
483 PROC_UNLOCK(p);
484 return (error);
485 }
486
487 /*
488 * Free a job entry. Wait for completion if it is currently active, but don't
489 * delay forever. If we delay, we return a flag that says that we have to
490 * restart the queue scan.
491 */
492 static int
493 aio_free_entry(struct kaiocb *job)
494 {
495 struct kaioinfo *ki;
496 struct aioliojob *lj;
497 struct proc *p;
498
499 p = job->userproc;
500 MPASS(curproc == p);
501 ki = p->p_aioinfo;
502 MPASS(ki != NULL);
503
504 AIO_LOCK_ASSERT(ki, MA_OWNED);
505 MPASS(job->jobflags & KAIOCB_FINISHED);
506
507 atomic_subtract_int(&num_queue_count, 1);
508
509 ki->kaio_count--;
510 MPASS(ki->kaio_count >= 0);
511
512 TAILQ_REMOVE(&ki->kaio_done, job, plist);
513 TAILQ_REMOVE(&ki->kaio_all, job, allist);
514
515 lj = job->lio;
516 if (lj) {
517 lj->lioj_count--;
518 lj->lioj_finished_count--;
519
520 if (lj->lioj_count == 0) {
521 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
522 /* lio is going away, we need to destroy any knotes */
523 knlist_delete(&lj->klist, curthread, 1);
524 PROC_LOCK(p);
525 sigqueue_take(&lj->lioj_ksi);
526 PROC_UNLOCK(p);
527 uma_zfree(aiolio_zone, lj);
528 }
529 }
530
531 /* job is going away, we need to destroy any knotes */
532 knlist_delete(&job->klist, curthread, 1);
533 PROC_LOCK(p);
534 sigqueue_take(&job->ksi);
535 PROC_UNLOCK(p);
536
537 AIO_UNLOCK(ki);
538
539 /*
540 * The thread argument here is used to find the owning process
541 * and is also passed to fo_close() which may pass it to various
542 * places such as devsw close() routines. Because of that, we
543 * need a thread pointer from the process owning the job that is
544 * persistent and won't disappear out from under us or move to
545 * another process.
546 *
547 * Currently, all the callers of this function call it to remove
548 * a kaiocb from the current process' job list either via a
549 * syscall or due to the current process calling exit() or
550 * execve(). Thus, we know that p == curproc. We also know that
551 * curthread can't exit since we are curthread.
552 *
553 * Therefore, we use curthread as the thread to pass to
554 * knlist_delete(). This does mean that it is possible for the
555 * thread pointer at close time to differ from the thread pointer
556 * at open time, but this is already true of file descriptors in
557 * a multithreaded process.
558 */
559 if (job->fd_file)
560 fdrop(job->fd_file, curthread);
561 crfree(job->cred);
562 uma_zfree(aiocb_zone, job);
563 AIO_LOCK(ki);
564
565 return (0);
566 }
567
568 static void
569 aio_proc_rundown_exec(void *arg, struct proc *p,
570 struct image_params *imgp __unused)
571 {
572 aio_proc_rundown(arg, p);
573 }
574
575 static int
576 aio_cancel_job(struct proc *p, struct kaioinfo *ki, struct kaiocb *job)
577 {
578 aio_cancel_fn_t *func;
579 int cancelled;
580
581 AIO_LOCK_ASSERT(ki, MA_OWNED);
582 if (job->jobflags & (KAIOCB_CANCELLED | KAIOCB_FINISHED))
583 return (0);
584 MPASS((job->jobflags & KAIOCB_CANCELLING) == 0);
585 job->jobflags |= KAIOCB_CANCELLED;
586
587 func = job->cancel_fn;
588
589 /*
590 * If there is no cancel routine, just leave the job marked as
591 * cancelled. The job should be in active use by a caller who
592 * should complete it normally or when it fails to install a
593 * cancel routine.
594 */
595 if (func == NULL)
596 return (0);
597
598 /*
599 * Set the CANCELLING flag so that aio_complete() will defer
600 * completions of this job. This prevents the job from being
601 * freed out from under the cancel callback. After the
602 * callback any deferred completion (whether from the callback
603 * or any other source) will be completed.
604 */
605 job->jobflags |= KAIOCB_CANCELLING;
606 AIO_UNLOCK(ki);
607 func(job);
608 AIO_LOCK(ki);
609 job->jobflags &= ~KAIOCB_CANCELLING;
610 if (job->jobflags & KAIOCB_FINISHED) {
611 cancelled = job->uaiocb._aiocb_private.error == ECANCELED;
612 TAILQ_REMOVE(&ki->kaio_jobqueue, job, plist);
613 aio_bio_done_notify(p, job);
614 } else {
615 /*
616 * The cancel callback might have scheduled an
617 * operation to cancel this request, but it is
618 * only counted as cancelled if the request is
619 * cancelled when the callback returns.
620 */
621 cancelled = 0;
622 }
623 return (cancelled);
624 }
625
626 /*
627 * Rundown the jobs for a given process.
628 */
629 static void
630 aio_proc_rundown(void *arg, struct proc *p)
631 {
632 struct kaioinfo *ki;
633 struct aioliojob *lj;
634 struct kaiocb *job, *jobn;
635
636 KASSERT(curthread->td_proc == p,
637 ("%s: called on non-curproc", __func__));
638 ki = p->p_aioinfo;
639 if (ki == NULL)
640 return;
641
642 AIO_LOCK(ki);
643 ki->kaio_flags |= KAIO_RUNDOWN;
644
645 restart:
646
647 /*
648 * Try to cancel all pending requests. This code simulates
649 * aio_cancel on all pending I/O requests.
650 */
651 TAILQ_FOREACH_SAFE(job, &ki->kaio_jobqueue, plist, jobn) {
652 aio_cancel_job(p, ki, job);
653 }
654
655 /* Wait for all running I/O to be finished */
656 if (TAILQ_FIRST(&ki->kaio_jobqueue) || ki->kaio_active_count != 0) {
657 ki->kaio_flags |= KAIO_WAKEUP;
658 msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO, "aioprn", hz);
659 goto restart;
660 }
661
662 /* Free all completed I/O requests. */
663 while ((job = TAILQ_FIRST(&ki->kaio_done)) != NULL)
664 aio_free_entry(job);
665
666 while ((lj = TAILQ_FIRST(&ki->kaio_liojoblist)) != NULL) {
667 if (lj->lioj_count == 0) {
668 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
669 knlist_delete(&lj->klist, curthread, 1);
670 PROC_LOCK(p);
671 sigqueue_take(&lj->lioj_ksi);
672 PROC_UNLOCK(p);
673 uma_zfree(aiolio_zone, lj);
674 } else {
675 panic("LIO job not cleaned up: C:%d, FC:%d\n",
676 lj->lioj_count, lj->lioj_finished_count);
677 }
678 }
679 AIO_UNLOCK(ki);
680 taskqueue_drain(taskqueue_aiod_kick, &ki->kaio_task);
681 taskqueue_drain(taskqueue_aiod_kick, &ki->kaio_sync_task);
682 mtx_destroy(&ki->kaio_mtx);
683 uma_zfree(kaio_zone, ki);
684 p->p_aioinfo = NULL;
685 }
686
687 /*
688 * Select a job to run (called by an AIO daemon).
689 */
690 static struct kaiocb *
691 aio_selectjob(struct aioproc *aiop)
692 {
693 struct kaiocb *job;
694 struct kaioinfo *ki;
695 struct proc *userp;
696
697 mtx_assert(&aio_job_mtx, MA_OWNED);
698 restart:
699 TAILQ_FOREACH(job, &aio_jobs, list) {
700 userp = job->userproc;
701 ki = userp->p_aioinfo;
702
703 if (ki->kaio_active_count < max_aio_per_proc) {
704 TAILQ_REMOVE(&aio_jobs, job, list);
705 if (!aio_clear_cancel_function(job))
706 goto restart;
707
708 /* Account for currently active jobs. */
709 ki->kaio_active_count++;
710 break;
711 }
712 }
713 return (job);
714 }
715
716 /*
717 * Move all data to a permanent storage device. This code
718 * simulates the fsync syscall.
719 */
720 static int
721 aio_fsync_vnode(struct thread *td, struct vnode *vp)
722 {
723 struct mount *mp;
724 int error;
725
726 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
727 goto drop;
728 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
729 if (vp->v_object != NULL) {
730 VM_OBJECT_WLOCK(vp->v_object);
731 vm_object_page_clean(vp->v_object, 0, 0, 0);
732 VM_OBJECT_WUNLOCK(vp->v_object);
733 }
734 error = VOP_FSYNC(vp, MNT_WAIT, td);
735
736 VOP_UNLOCK(vp, 0);
737 vn_finished_write(mp);
738 drop:
739 return (error);
740 }
741
742 /*
743 * The AIO processing activity for LIO_READ/LIO_WRITE. This is the code that
744 * does the I/O request for the non-physio version of the operations. The
745 * normal vn operations are used, and this code should work in all instances
746 * for every type of file, including pipes, sockets, fifos, and regular files.
747 *
748 * XXX I don't think it works well for socket, pipe, and fifo.
749 */
750 static void
751 aio_process_rw(struct kaiocb *job)
752 {
753 struct ucred *td_savedcred;
754 struct thread *td;
755 struct aiocb *cb;
756 struct file *fp;
757 struct uio auio;
758 struct iovec aiov;
759 ssize_t cnt;
760 long msgsnd_st, msgsnd_end;
761 long msgrcv_st, msgrcv_end;
762 long oublock_st, oublock_end;
763 long inblock_st, inblock_end;
764 int error;
765
766 KASSERT(job->uaiocb.aio_lio_opcode == LIO_READ ||
767 job->uaiocb.aio_lio_opcode == LIO_WRITE,
768 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode));
769
770 aio_switch_vmspace(job);
771 td = curthread;
772 td_savedcred = td->td_ucred;
773 td->td_ucred = job->cred;
774 cb = &job->uaiocb;
775 fp = job->fd_file;
776
777 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
778 aiov.iov_len = cb->aio_nbytes;
779
780 auio.uio_iov = &aiov;
781 auio.uio_iovcnt = 1;
782 auio.uio_offset = cb->aio_offset;
783 auio.uio_resid = cb->aio_nbytes;
784 cnt = cb->aio_nbytes;
785 auio.uio_segflg = UIO_USERSPACE;
786 auio.uio_td = td;
787
788 msgrcv_st = td->td_ru.ru_msgrcv;
789 msgsnd_st = td->td_ru.ru_msgsnd;
790 inblock_st = td->td_ru.ru_inblock;
791 oublock_st = td->td_ru.ru_oublock;
792
793 /*
794 * aio_aqueue() acquires a reference to the file that is
795 * released in aio_free_entry().
796 */
797 if (cb->aio_lio_opcode == LIO_READ) {
798 auio.uio_rw = UIO_READ;
799 if (auio.uio_resid == 0)
800 error = 0;
801 else
802 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td);
803 } else {
804 if (fp->f_type == DTYPE_VNODE)
805 bwillwrite();
806 auio.uio_rw = UIO_WRITE;
807 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td);
808 }
809 msgrcv_end = td->td_ru.ru_msgrcv;
810 msgsnd_end = td->td_ru.ru_msgsnd;
811 inblock_end = td->td_ru.ru_inblock;
812 oublock_end = td->td_ru.ru_oublock;
813
814 job->msgrcv = msgrcv_end - msgrcv_st;
815 job->msgsnd = msgsnd_end - msgsnd_st;
816 job->inblock = inblock_end - inblock_st;
817 job->outblock = oublock_end - oublock_st;
818
819 if ((error) && (auio.uio_resid != cnt)) {
820 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
821 error = 0;
822 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) {
823 PROC_LOCK(job->userproc);
824 kern_psignal(job->userproc, SIGPIPE);
825 PROC_UNLOCK(job->userproc);
826 }
827 }
828
829 cnt -= auio.uio_resid;
830 td->td_ucred = td_savedcred;
831 if (error)
832 aio_complete(job, -1, error);
833 else
834 aio_complete(job, cnt, 0);
835 }
836
837 static void
838 aio_process_sync(struct kaiocb *job)
839 {
840 struct thread *td = curthread;
841 struct ucred *td_savedcred = td->td_ucred;
842 struct file *fp = job->fd_file;
843 int error = 0;
844
845 KASSERT(job->uaiocb.aio_lio_opcode == LIO_SYNC,
846 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode));
847
848 td->td_ucred = job->cred;
849 if (fp->f_vnode != NULL)
850 error = aio_fsync_vnode(td, fp->f_vnode);
851 td->td_ucred = td_savedcred;
852 if (error)
853 aio_complete(job, -1, error);
854 else
855 aio_complete(job, 0, 0);
856 }
857
858 static void
859 aio_process_mlock(struct kaiocb *job)
860 {
861 struct aiocb *cb = &job->uaiocb;
862 int error;
863
864 KASSERT(job->uaiocb.aio_lio_opcode == LIO_MLOCK,
865 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode));
866
867 aio_switch_vmspace(job);
868 error = kern_mlock(job->userproc, job->cred,
869 __DEVOLATILE(uintptr_t, cb->aio_buf), cb->aio_nbytes);
870 aio_complete(job, error != 0 ? -1 : 0, error);
871 }
872
873 static void
874 aio_bio_done_notify(struct proc *userp, struct kaiocb *job)
875 {
876 struct aioliojob *lj;
877 struct kaioinfo *ki;
878 struct kaiocb *sjob, *sjobn;
879 int lj_done;
880 bool schedule_fsync;
881
882 ki = userp->p_aioinfo;
883 AIO_LOCK_ASSERT(ki, MA_OWNED);
884 lj = job->lio;
885 lj_done = 0;
886 if (lj) {
887 lj->lioj_finished_count++;
888 if (lj->lioj_count == lj->lioj_finished_count)
889 lj_done = 1;
890 }
891 TAILQ_INSERT_TAIL(&ki->kaio_done, job, plist);
892 MPASS(job->jobflags & KAIOCB_FINISHED);
893
894 if (ki->kaio_flags & KAIO_RUNDOWN)
895 goto notification_done;
896
897 if (job->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
898 job->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID)
899 aio_sendsig(userp, &job->uaiocb.aio_sigevent, &job->ksi);
900
901 KNOTE_LOCKED(&job->klist, 1);
902
903 if (lj_done) {
904 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
905 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
906 KNOTE_LOCKED(&lj->klist, 1);
907 }
908 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
909 == LIOJ_SIGNAL
910 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
911 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
912 aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi);
913 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
914 }
915 }
916
917 notification_done:
918 if (job->jobflags & KAIOCB_CHECKSYNC) {
919 schedule_fsync = false;
920 TAILQ_FOREACH_SAFE(sjob, &ki->kaio_syncqueue, list, sjobn) {
921 if (job->fd_file != sjob->fd_file ||
922 job->seqno >= sjob->seqno)
923 continue;
924 if (--sjob->pending > 0)
925 continue;
926 TAILQ_REMOVE(&ki->kaio_syncqueue, sjob, list);
927 if (!aio_clear_cancel_function_locked(sjob))
928 continue;
929 TAILQ_INSERT_TAIL(&ki->kaio_syncready, sjob, list);
930 schedule_fsync = true;
931 }
932 if (schedule_fsync)
933 taskqueue_enqueue(taskqueue_aiod_kick,
934 &ki->kaio_sync_task);
935 }
936 if (ki->kaio_flags & KAIO_WAKEUP) {
937 ki->kaio_flags &= ~KAIO_WAKEUP;
938 wakeup(&userp->p_aioinfo);
939 }
940 }
941
942 static void
943 aio_schedule_fsync(void *context, int pending)
944 {
945 struct kaioinfo *ki;
946 struct kaiocb *job;
947
948 ki = context;
949 AIO_LOCK(ki);
950 while (!TAILQ_EMPTY(&ki->kaio_syncready)) {
951 job = TAILQ_FIRST(&ki->kaio_syncready);
952 TAILQ_REMOVE(&ki->kaio_syncready, job, list);
953 AIO_UNLOCK(ki);
954 aio_schedule(job, aio_process_sync);
955 AIO_LOCK(ki);
956 }
957 AIO_UNLOCK(ki);
958 }
959
960 bool
961 aio_cancel_cleared(struct kaiocb *job)
962 {
963
964 /*
965 * The caller should hold the same queue lock held when
966 * aio_clear_cancel_function() was called and set this flag
967 * ensuring this check sees an up-to-date value. However,
968 * there is no way to assert that.
969 */
970 return ((job->jobflags & KAIOCB_CLEARED) != 0);
971 }
972
973 static bool
974 aio_clear_cancel_function_locked(struct kaiocb *job)
975 {
976
977 AIO_LOCK_ASSERT(job->userproc->p_aioinfo, MA_OWNED);
978 MPASS(job->cancel_fn != NULL);
979 if (job->jobflags & KAIOCB_CANCELLING) {
980 job->jobflags |= KAIOCB_CLEARED;
981 return (false);
982 }
983 job->cancel_fn = NULL;
984 return (true);
985 }
986
987 bool
988 aio_clear_cancel_function(struct kaiocb *job)
989 {
990 struct kaioinfo *ki;
991 bool ret;
992
993 ki = job->userproc->p_aioinfo;
994 AIO_LOCK(ki);
995 ret = aio_clear_cancel_function_locked(job);
996 AIO_UNLOCK(ki);
997 return (ret);
998 }
999
1000 static bool
1001 aio_set_cancel_function_locked(struct kaiocb *job, aio_cancel_fn_t *func)
1002 {
1003
1004 AIO_LOCK_ASSERT(job->userproc->p_aioinfo, MA_OWNED);
1005 if (job->jobflags & KAIOCB_CANCELLED)
1006 return (false);
1007 job->cancel_fn = func;
1008 return (true);
1009 }
1010
1011 bool
1012 aio_set_cancel_function(struct kaiocb *job, aio_cancel_fn_t *func)
1013 {
1014 struct kaioinfo *ki;
1015 bool ret;
1016
1017 ki = job->userproc->p_aioinfo;
1018 AIO_LOCK(ki);
1019 ret = aio_set_cancel_function_locked(job, func);
1020 AIO_UNLOCK(ki);
1021 return (ret);
1022 }
1023
1024 void
1025 aio_complete(struct kaiocb *job, long status, int error)
1026 {
1027 struct kaioinfo *ki;
1028 struct proc *userp;
1029
1030 job->uaiocb._aiocb_private.error = error;
1031 job->uaiocb._aiocb_private.status = status;
1032
1033 userp = job->userproc;
1034 ki = userp->p_aioinfo;
1035
1036 AIO_LOCK(ki);
1037 KASSERT(!(job->jobflags & KAIOCB_FINISHED),
1038 ("duplicate aio_complete"));
1039 job->jobflags |= KAIOCB_FINISHED;
1040 if ((job->jobflags & (KAIOCB_QUEUEING | KAIOCB_CANCELLING)) == 0) {
1041 TAILQ_REMOVE(&ki->kaio_jobqueue, job, plist);
1042 aio_bio_done_notify(userp, job);
1043 }
1044 AIO_UNLOCK(ki);
1045 }
1046
1047 void
1048 aio_cancel(struct kaiocb *job)
1049 {
1050
1051 aio_complete(job, -1, ECANCELED);
1052 }
1053
1054 void
1055 aio_switch_vmspace(struct kaiocb *job)
1056 {
1057
1058 vmspace_switch_aio(job->userproc->p_vmspace);
1059 }
1060
1061 /*
1062 * The AIO daemon, most of the actual work is done in aio_process_*,
1063 * but the setup (and address space mgmt) is done in this routine.
1064 */
1065 static void
1066 aio_daemon(void *_id)
1067 {
1068 struct kaiocb *job;
1069 struct aioproc *aiop;
1070 struct kaioinfo *ki;
1071 struct proc *p;
1072 struct vmspace *myvm;
1073 struct thread *td = curthread;
1074 int id = (intptr_t)_id;
1075
1076 /*
1077 * Grab an extra reference on the daemon's vmspace so that it
1078 * doesn't get freed by jobs that switch to a different
1079 * vmspace.
1080 */
1081 p = td->td_proc;
1082 myvm = vmspace_acquire_ref(p);
1083
1084 KASSERT(p->p_textvp == NULL, ("kthread has a textvp"));
1085
1086 /*
1087 * Allocate and ready the aio control info. There is one aiop structure
1088 * per daemon.
1089 */
1090 aiop = uma_zalloc(aiop_zone, M_WAITOK);
1091 aiop->aioproc = p;
1092 aiop->aioprocflags = 0;
1093
1094 /*
1095 * Wakeup parent process. (Parent sleeps to keep from blasting away
1096 * and creating too many daemons.)
1097 */
1098 sema_post(&aio_newproc_sem);
1099
1100 mtx_lock(&aio_job_mtx);
1101 for (;;) {
1102 /*
1103 * Take daemon off of free queue
1104 */
1105 if (aiop->aioprocflags & AIOP_FREE) {
1106 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1107 aiop->aioprocflags &= ~AIOP_FREE;
1108 }
1109
1110 /*
1111 * Check for jobs.
1112 */
1113 while ((job = aio_selectjob(aiop)) != NULL) {
1114 mtx_unlock(&aio_job_mtx);
1115
1116 ki = job->userproc->p_aioinfo;
1117 job->handle_fn(job);
1118
1119 mtx_lock(&aio_job_mtx);
1120 /* Decrement the active job count. */
1121 ki->kaio_active_count--;
1122 }
1123
1124 /*
1125 * Disconnect from user address space.
1126 */
1127 if (p->p_vmspace != myvm) {
1128 mtx_unlock(&aio_job_mtx);
1129 vmspace_switch_aio(myvm);
1130 mtx_lock(&aio_job_mtx);
1131 /*
1132 * We have to restart to avoid race, we only sleep if
1133 * no job can be selected.
1134 */
1135 continue;
1136 }
1137
1138 mtx_assert(&aio_job_mtx, MA_OWNED);
1139
1140 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
1141 aiop->aioprocflags |= AIOP_FREE;
1142
1143 /*
1144 * If daemon is inactive for a long time, allow it to exit,
1145 * thereby freeing resources.
1146 */
1147 if (msleep(p, &aio_job_mtx, PRIBIO, "aiordy",
1148 aiod_lifetime) == EWOULDBLOCK && TAILQ_EMPTY(&aio_jobs) &&
1149 (aiop->aioprocflags & AIOP_FREE) &&
1150 num_aio_procs > target_aio_procs)
1151 break;
1152 }
1153 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1154 num_aio_procs--;
1155 mtx_unlock(&aio_job_mtx);
1156 uma_zfree(aiop_zone, aiop);
1157 free_unr(aiod_unr, id);
1158 vmspace_free(myvm);
1159
1160 KASSERT(p->p_vmspace == myvm,
1161 ("AIOD: bad vmspace for exiting daemon"));
1162 KASSERT(myvm->vm_refcnt > 1,
1163 ("AIOD: bad vm refcnt for exiting daemon: %d", myvm->vm_refcnt));
1164 kproc_exit(0);
1165 }
1166
1167 /*
1168 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
1169 * AIO daemon modifies its environment itself.
1170 */
1171 static int
1172 aio_newproc(int *start)
1173 {
1174 int error;
1175 struct proc *p;
1176 int id;
1177
1178 id = alloc_unr(aiod_unr);
1179 error = kproc_create(aio_daemon, (void *)(intptr_t)id, &p,
1180 RFNOWAIT, 0, "aiod%d", id);
1181 if (error == 0) {
1182 /*
1183 * Wait until daemon is started.
1184 */
1185 sema_wait(&aio_newproc_sem);
1186 mtx_lock(&aio_job_mtx);
1187 num_aio_procs++;
1188 if (start != NULL)
1189 (*start)--;
1190 mtx_unlock(&aio_job_mtx);
1191 } else {
1192 free_unr(aiod_unr, id);
1193 }
1194 return (error);
1195 }
1196
1197 /*
1198 * Try the high-performance, low-overhead physio method for eligible
1199 * VCHR devices. This method doesn't use an aio helper thread, and
1200 * thus has very low overhead.
1201 *
1202 * Assumes that the caller, aio_aqueue(), has incremented the file
1203 * structure's reference count, preventing its deallocation for the
1204 * duration of this call.
1205 */
1206 static int
1207 aio_qphysio(struct proc *p, struct kaiocb *job)
1208 {
1209 struct aiocb *cb;
1210 struct file *fp;
1211 struct bio *bp;
1212 struct buf *pbuf;
1213 struct vnode *vp;
1214 struct cdevsw *csw;
1215 struct cdev *dev;
1216 struct kaioinfo *ki;
1217 int error, ref, poff;
1218 vm_prot_t prot;
1219
1220 cb = &job->uaiocb;
1221 fp = job->fd_file;
1222
1223 if (!(cb->aio_lio_opcode == LIO_WRITE ||
1224 cb->aio_lio_opcode == LIO_READ))
1225 return (-1);
1226 if (fp == NULL || fp->f_type != DTYPE_VNODE)
1227 return (-1);
1228
1229 vp = fp->f_vnode;
1230 if (vp->v_type != VCHR)
1231 return (-1);
1232 if (vp->v_bufobj.bo_bsize == 0)
1233 return (-1);
1234 if (cb->aio_nbytes % vp->v_bufobj.bo_bsize)
1235 return (-1);
1236
1237 ref = 0;
1238 csw = devvn_refthread(vp, &dev, &ref);
1239 if (csw == NULL)
1240 return (ENXIO);
1241
1242 if ((csw->d_flags & D_DISK) == 0) {
1243 error = -1;
1244 goto unref;
1245 }
1246 if (cb->aio_nbytes > dev->si_iosize_max) {
1247 error = -1;
1248 goto unref;
1249 }
1250
1251 ki = p->p_aioinfo;
1252 poff = (vm_offset_t)cb->aio_buf & PAGE_MASK;
1253 if ((dev->si_flags & SI_UNMAPPED) && unmapped_buf_allowed) {
1254 if (cb->aio_nbytes > MAXPHYS) {
1255 error = -1;
1256 goto unref;
1257 }
1258
1259 pbuf = NULL;
1260 } else {
1261 if (cb->aio_nbytes > MAXPHYS - poff) {
1262 error = -1;
1263 goto unref;
1264 }
1265 if (ki->kaio_buffer_count >= max_buf_aio) {
1266 error = EAGAIN;
1267 goto unref;
1268 }
1269
1270 job->pbuf = pbuf = (struct buf *)getpbuf(NULL);
1271 BUF_KERNPROC(pbuf);
1272 AIO_LOCK(ki);
1273 ki->kaio_buffer_count++;
1274 AIO_UNLOCK(ki);
1275 }
1276 job->bp = bp = g_alloc_bio();
1277
1278 bp->bio_length = cb->aio_nbytes;
1279 bp->bio_bcount = cb->aio_nbytes;
1280 bp->bio_done = aio_physwakeup;
1281 bp->bio_data = (void *)(uintptr_t)cb->aio_buf;
1282 bp->bio_offset = cb->aio_offset;
1283 bp->bio_cmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ;
1284 bp->bio_dev = dev;
1285 bp->bio_caller1 = (void *)job;
1286
1287 prot = VM_PROT_READ;
1288 if (cb->aio_lio_opcode == LIO_READ)
1289 prot |= VM_PROT_WRITE; /* Less backwards than it looks */
1290 job->npages = vm_fault_quick_hold_pages(&curproc->p_vmspace->vm_map,
1291 (vm_offset_t)bp->bio_data, bp->bio_length, prot, job->pages,
1292 nitems(job->pages));
1293 if (job->npages < 0) {
1294 error = EFAULT;
1295 goto doerror;
1296 }
1297 if (pbuf != NULL) {
1298 pmap_qenter((vm_offset_t)pbuf->b_data,
1299 job->pages, job->npages);
1300 bp->bio_data = pbuf->b_data + poff;
1301 atomic_add_int(&num_buf_aio, 1);
1302 } else {
1303 bp->bio_ma = job->pages;
1304 bp->bio_ma_n = job->npages;
1305 bp->bio_ma_offset = poff;
1306 bp->bio_data = unmapped_buf;
1307 bp->bio_flags |= BIO_UNMAPPED;
1308 atomic_add_int(&num_unmapped_aio, 1);
1309 }
1310
1311 /* Perform transfer. */
1312 csw->d_strategy(bp);
1313 dev_relthread(dev, ref);
1314 return (0);
1315
1316 doerror:
1317 if (pbuf != NULL) {
1318 AIO_LOCK(ki);
1319 ki->kaio_buffer_count--;
1320 AIO_UNLOCK(ki);
1321 relpbuf(pbuf, NULL);
1322 job->pbuf = NULL;
1323 }
1324 g_destroy_bio(bp);
1325 job->bp = NULL;
1326 unref:
1327 dev_relthread(dev, ref);
1328 return (error);
1329 }
1330
1331 #ifdef COMPAT_FREEBSD6
1332 static int
1333 convert_old_sigevent(struct osigevent *osig, struct sigevent *nsig)
1334 {
1335
1336 /*
1337 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are
1338 * supported by AIO with the old sigevent structure.
1339 */
1340 nsig->sigev_notify = osig->sigev_notify;
1341 switch (nsig->sigev_notify) {
1342 case SIGEV_NONE:
1343 break;
1344 case SIGEV_SIGNAL:
1345 nsig->sigev_signo = osig->__sigev_u.__sigev_signo;
1346 break;
1347 case SIGEV_KEVENT:
1348 nsig->sigev_notify_kqueue =
1349 osig->__sigev_u.__sigev_notify_kqueue;
1350 nsig->sigev_value.sival_ptr = osig->sigev_value.sival_ptr;
1351 break;
1352 default:
1353 return (EINVAL);
1354 }
1355 return (0);
1356 }
1357
1358 static int
1359 aiocb_copyin_old_sigevent(struct aiocb *ujob, struct aiocb *kjob)
1360 {
1361 struct oaiocb *ojob;
1362 int error;
1363
1364 bzero(kjob, sizeof(struct aiocb));
1365 error = copyin(ujob, kjob, sizeof(struct oaiocb));
1366 if (error)
1367 return (error);
1368 ojob = (struct oaiocb *)kjob;
1369 return (convert_old_sigevent(&ojob->aio_sigevent, &kjob->aio_sigevent));
1370 }
1371 #endif
1372
1373 static int
1374 aiocb_copyin(struct aiocb *ujob, struct aiocb *kjob)
1375 {
1376
1377 return (copyin(ujob, kjob, sizeof(struct aiocb)));
1378 }
1379
1380 static long
1381 aiocb_fetch_status(struct aiocb *ujob)
1382 {
1383
1384 return (fuword(&ujob->_aiocb_private.status));
1385 }
1386
1387 static long
1388 aiocb_fetch_error(struct aiocb *ujob)
1389 {
1390
1391 return (fuword(&ujob->_aiocb_private.error));
1392 }
1393
1394 static int
1395 aiocb_store_status(struct aiocb *ujob, long status)
1396 {
1397
1398 return (suword(&ujob->_aiocb_private.status, status));
1399 }
1400
1401 static int
1402 aiocb_store_error(struct aiocb *ujob, long error)
1403 {
1404
1405 return (suword(&ujob->_aiocb_private.error, error));
1406 }
1407
1408 static int
1409 aiocb_store_kernelinfo(struct aiocb *ujob, long jobref)
1410 {
1411
1412 return (suword(&ujob->_aiocb_private.kernelinfo, jobref));
1413 }
1414
1415 static int
1416 aiocb_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob)
1417 {
1418
1419 return (suword(ujobp, (long)ujob));
1420 }
1421
1422 static struct aiocb_ops aiocb_ops = {
1423 .copyin = aiocb_copyin,
1424 .fetch_status = aiocb_fetch_status,
1425 .fetch_error = aiocb_fetch_error,
1426 .store_status = aiocb_store_status,
1427 .store_error = aiocb_store_error,
1428 .store_kernelinfo = aiocb_store_kernelinfo,
1429 .store_aiocb = aiocb_store_aiocb,
1430 };
1431
1432 #ifdef COMPAT_FREEBSD6
1433 static struct aiocb_ops aiocb_ops_osigevent = {
1434 .copyin = aiocb_copyin_old_sigevent,
1435 .fetch_status = aiocb_fetch_status,
1436 .fetch_error = aiocb_fetch_error,
1437 .store_status = aiocb_store_status,
1438 .store_error = aiocb_store_error,
1439 .store_kernelinfo = aiocb_store_kernelinfo,
1440 .store_aiocb = aiocb_store_aiocb,
1441 };
1442 #endif
1443
1444 /*
1445 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR
1446 * technique is done in this code.
1447 */
1448 int
1449 aio_aqueue(struct thread *td, struct aiocb *ujob, struct aioliojob *lj,
1450 int type, struct aiocb_ops *ops)
1451 {
1452 struct proc *p = td->td_proc;
1453 struct file *fp;
1454 struct kaiocb *job;
1455 struct kaioinfo *ki;
1456 struct kevent kev;
1457 int opcode;
1458 int error;
1459 int fd, kqfd;
1460 int jid;
1461 u_short evflags;
1462
1463 if (p->p_aioinfo == NULL)
1464 aio_init_aioinfo(p);
1465
1466 ki = p->p_aioinfo;
1467
1468 ops->store_status(ujob, -1);
1469 ops->store_error(ujob, 0);
1470 ops->store_kernelinfo(ujob, -1);
1471
1472 if (num_queue_count >= max_queue_count ||
1473 ki->kaio_count >= max_aio_queue_per_proc) {
1474 ops->store_error(ujob, EAGAIN);
1475 return (EAGAIN);
1476 }
1477
1478 job = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO);
1479 knlist_init_mtx(&job->klist, AIO_MTX(ki));
1480
1481 error = ops->copyin(ujob, &job->uaiocb);
1482 if (error) {
1483 ops->store_error(ujob, error);
1484 uma_zfree(aiocb_zone, job);
1485 return (error);
1486 }
1487
1488 if (job->uaiocb.aio_nbytes > IOSIZE_MAX) {
1489 uma_zfree(aiocb_zone, job);
1490 return (EINVAL);
1491 }
1492
1493 if (job->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT &&
1494 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL &&
1495 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID &&
1496 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) {
1497 ops->store_error(ujob, EINVAL);
1498 uma_zfree(aiocb_zone, job);
1499 return (EINVAL);
1500 }
1501
1502 if ((job->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
1503 job->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) &&
1504 !_SIG_VALID(job->uaiocb.aio_sigevent.sigev_signo)) {
1505 uma_zfree(aiocb_zone, job);
1506 return (EINVAL);
1507 }
1508
1509 ksiginfo_init(&job->ksi);
1510
1511 /* Save userspace address of the job info. */
1512 job->ujob = ujob;
1513
1514 /* Get the opcode. */
1515 if (type != LIO_NOP)
1516 job->uaiocb.aio_lio_opcode = type;
1517 opcode = job->uaiocb.aio_lio_opcode;
1518
1519 /*
1520 * Validate the opcode and fetch the file object for the specified
1521 * file descriptor.
1522 *
1523 * XXXRW: Moved the opcode validation up here so that we don't
1524 * retrieve a file descriptor without knowing what the capabiltity
1525 * should be.
1526 */
1527 fd = job->uaiocb.aio_fildes;
1528 switch (opcode) {
1529 case LIO_WRITE:
1530 error = fget_write(td, fd, &cap_pwrite_rights, &fp);
1531 break;
1532 case LIO_READ:
1533 error = fget_read(td, fd, &cap_pread_rights, &fp);
1534 break;
1535 case LIO_SYNC:
1536 error = fget(td, fd, &cap_fsync_rights, &fp);
1537 break;
1538 case LIO_MLOCK:
1539 fp = NULL;
1540 break;
1541 case LIO_NOP:
1542 error = fget(td, fd, &cap_no_rights, &fp);
1543 break;
1544 default:
1545 error = EINVAL;
1546 }
1547 if (error) {
1548 uma_zfree(aiocb_zone, job);
1549 ops->store_error(ujob, error);
1550 return (error);
1551 }
1552
1553 if (opcode == LIO_SYNC && fp->f_vnode == NULL) {
1554 error = EINVAL;
1555 goto aqueue_fail;
1556 }
1557
1558 if ((opcode == LIO_READ || opcode == LIO_WRITE) &&
1559 job->uaiocb.aio_offset < 0 &&
1560 (fp->f_vnode == NULL || fp->f_vnode->v_type != VCHR)) {
1561 error = EINVAL;
1562 goto aqueue_fail;
1563 }
1564
1565 job->fd_file = fp;
1566
1567 mtx_lock(&aio_job_mtx);
1568 jid = jobrefid++;
1569 job->seqno = jobseqno++;
1570 mtx_unlock(&aio_job_mtx);
1571 error = ops->store_kernelinfo(ujob, jid);
1572 if (error) {
1573 error = EINVAL;
1574 goto aqueue_fail;
1575 }
1576 job->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid;
1577
1578 if (opcode == LIO_NOP) {
1579 fdrop(fp, td);
1580 uma_zfree(aiocb_zone, job);
1581 return (0);
1582 }
1583
1584 if (job->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT)
1585 goto no_kqueue;
1586 evflags = job->uaiocb.aio_sigevent.sigev_notify_kevent_flags;
1587 if ((evflags & ~(EV_CLEAR | EV_DISPATCH | EV_ONESHOT)) != 0) {
1588 error = EINVAL;
1589 goto aqueue_fail;
1590 }
1591 kqfd = job->uaiocb.aio_sigevent.sigev_notify_kqueue;
1592 memset(&kev, 0, sizeof(kev));
1593 kev.ident = (uintptr_t)job->ujob;
1594 kev.filter = EVFILT_AIO;
1595 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1 | evflags;
1596 kev.data = (intptr_t)job;
1597 kev.udata = job->uaiocb.aio_sigevent.sigev_value.sival_ptr;
1598 error = kqfd_register(kqfd, &kev, td, 1);
1599 if (error)
1600 goto aqueue_fail;
1601
1602 no_kqueue:
1603
1604 ops->store_error(ujob, EINPROGRESS);
1605 job->uaiocb._aiocb_private.error = EINPROGRESS;
1606 job->userproc = p;
1607 job->cred = crhold(td->td_ucred);
1608 job->jobflags = KAIOCB_QUEUEING;
1609 job->lio = lj;
1610
1611 if (opcode == LIO_MLOCK) {
1612 aio_schedule(job, aio_process_mlock);
1613 error = 0;
1614 } else if (fp->f_ops->fo_aio_queue == NULL)
1615 error = aio_queue_file(fp, job);
1616 else
1617 error = fo_aio_queue(fp, job);
1618 if (error)
1619 goto aqueue_fail;
1620
1621 AIO_LOCK(ki);
1622 job->jobflags &= ~KAIOCB_QUEUEING;
1623 TAILQ_INSERT_TAIL(&ki->kaio_all, job, allist);
1624 ki->kaio_count++;
1625 if (lj)
1626 lj->lioj_count++;
1627 atomic_add_int(&num_queue_count, 1);
1628 if (job->jobflags & KAIOCB_FINISHED) {
1629 /*
1630 * The queue callback completed the request synchronously.
1631 * The bulk of the completion is deferred in that case
1632 * until this point.
1633 */
1634 aio_bio_done_notify(p, job);
1635 } else
1636 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, job, plist);
1637 AIO_UNLOCK(ki);
1638 return (0);
1639
1640 aqueue_fail:
1641 knlist_delete(&job->klist, curthread, 0);
1642 if (fp)
1643 fdrop(fp, td);
1644 uma_zfree(aiocb_zone, job);
1645 ops->store_error(ujob, error);
1646 return (error);
1647 }
1648
1649 static void
1650 aio_cancel_daemon_job(struct kaiocb *job)
1651 {
1652
1653 mtx_lock(&aio_job_mtx);
1654 if (!aio_cancel_cleared(job))
1655 TAILQ_REMOVE(&aio_jobs, job, list);
1656 mtx_unlock(&aio_job_mtx);
1657 aio_cancel(job);
1658 }
1659
1660 void
1661 aio_schedule(struct kaiocb *job, aio_handle_fn_t *func)
1662 {
1663
1664 mtx_lock(&aio_job_mtx);
1665 if (!aio_set_cancel_function(job, aio_cancel_daemon_job)) {
1666 mtx_unlock(&aio_job_mtx);
1667 aio_cancel(job);
1668 return;
1669 }
1670 job->handle_fn = func;
1671 TAILQ_INSERT_TAIL(&aio_jobs, job, list);
1672 aio_kick_nowait(job->userproc);
1673 mtx_unlock(&aio_job_mtx);
1674 }
1675
1676 static void
1677 aio_cancel_sync(struct kaiocb *job)
1678 {
1679 struct kaioinfo *ki;
1680
1681 ki = job->userproc->p_aioinfo;
1682 AIO_LOCK(ki);
1683 if (!aio_cancel_cleared(job))
1684 TAILQ_REMOVE(&ki->kaio_syncqueue, job, list);
1685 AIO_UNLOCK(ki);
1686 aio_cancel(job);
1687 }
1688
1689 int
1690 aio_queue_file(struct file *fp, struct kaiocb *job)
1691 {
1692 struct kaioinfo *ki;
1693 struct kaiocb *job2;
1694 struct vnode *vp;
1695 struct mount *mp;
1696 int error;
1697 bool safe;
1698
1699 ki = job->userproc->p_aioinfo;
1700 error = aio_qphysio(job->userproc, job);
1701 if (error >= 0)
1702 return (error);
1703 safe = false;
1704 if (fp->f_type == DTYPE_VNODE) {
1705 vp = fp->f_vnode;
1706 if (vp->v_type == VREG || vp->v_type == VDIR) {
1707 mp = fp->f_vnode->v_mount;
1708 if (mp == NULL || (mp->mnt_flag & MNT_LOCAL) != 0)
1709 safe = true;
1710 }
1711 }
1712 if (!(safe || enable_aio_unsafe)) {
1713 counted_warning(&unsafe_warningcnt,
1714 "is attempting to use unsafe AIO requests");
1715 return (EOPNOTSUPP);
1716 }
1717
1718 switch (job->uaiocb.aio_lio_opcode) {
1719 case LIO_READ:
1720 case LIO_WRITE:
1721 aio_schedule(job, aio_process_rw);
1722 error = 0;
1723 break;
1724 case LIO_SYNC:
1725 AIO_LOCK(ki);
1726 TAILQ_FOREACH(job2, &ki->kaio_jobqueue, plist) {
1727 if (job2->fd_file == job->fd_file &&
1728 job2->uaiocb.aio_lio_opcode != LIO_SYNC &&
1729 job2->seqno < job->seqno) {
1730 job2->jobflags |= KAIOCB_CHECKSYNC;
1731 job->pending++;
1732 }
1733 }
1734 if (job->pending != 0) {
1735 if (!aio_set_cancel_function_locked(job,
1736 aio_cancel_sync)) {
1737 AIO_UNLOCK(ki);
1738 aio_cancel(job);
1739 return (0);
1740 }
1741 TAILQ_INSERT_TAIL(&ki->kaio_syncqueue, job, list);
1742 AIO_UNLOCK(ki);
1743 return (0);
1744 }
1745 AIO_UNLOCK(ki);
1746 aio_schedule(job, aio_process_sync);
1747 error = 0;
1748 break;
1749 default:
1750 error = EINVAL;
1751 }
1752 return (error);
1753 }
1754
1755 static void
1756 aio_kick_nowait(struct proc *userp)
1757 {
1758 struct kaioinfo *ki = userp->p_aioinfo;
1759 struct aioproc *aiop;
1760
1761 mtx_assert(&aio_job_mtx, MA_OWNED);
1762 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1763 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1764 aiop->aioprocflags &= ~AIOP_FREE;
1765 wakeup(aiop->aioproc);
1766 } else if (num_aio_resv_start + num_aio_procs < max_aio_procs &&
1767 ki->kaio_active_count + num_aio_resv_start < max_aio_per_proc) {
1768 taskqueue_enqueue(taskqueue_aiod_kick, &ki->kaio_task);
1769 }
1770 }
1771
1772 static int
1773 aio_kick(struct proc *userp)
1774 {
1775 struct kaioinfo *ki = userp->p_aioinfo;
1776 struct aioproc *aiop;
1777 int error, ret = 0;
1778
1779 mtx_assert(&aio_job_mtx, MA_OWNED);
1780 retryproc:
1781 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1782 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1783 aiop->aioprocflags &= ~AIOP_FREE;
1784 wakeup(aiop->aioproc);
1785 } else if (num_aio_resv_start + num_aio_procs < max_aio_procs &&
1786 ki->kaio_active_count + num_aio_resv_start < max_aio_per_proc) {
1787 num_aio_resv_start++;
1788 mtx_unlock(&aio_job_mtx);
1789 error = aio_newproc(&num_aio_resv_start);
1790 mtx_lock(&aio_job_mtx);
1791 if (error) {
1792 num_aio_resv_start--;
1793 goto retryproc;
1794 }
1795 } else {
1796 ret = -1;
1797 }
1798 return (ret);
1799 }
1800
1801 static void
1802 aio_kick_helper(void *context, int pending)
1803 {
1804 struct proc *userp = context;
1805
1806 mtx_lock(&aio_job_mtx);
1807 while (--pending >= 0) {
1808 if (aio_kick(userp))
1809 break;
1810 }
1811 mtx_unlock(&aio_job_mtx);
1812 }
1813
1814 /*
1815 * Support the aio_return system call, as a side-effect, kernel resources are
1816 * released.
1817 */
1818 static int
1819 kern_aio_return(struct thread *td, struct aiocb *ujob, struct aiocb_ops *ops)
1820 {
1821 struct proc *p = td->td_proc;
1822 struct kaiocb *job;
1823 struct kaioinfo *ki;
1824 long status, error;
1825
1826 ki = p->p_aioinfo;
1827 if (ki == NULL)
1828 return (EINVAL);
1829 AIO_LOCK(ki);
1830 TAILQ_FOREACH(job, &ki->kaio_done, plist) {
1831 if (job->ujob == ujob)
1832 break;
1833 }
1834 if (job != NULL) {
1835 MPASS(job->jobflags & KAIOCB_FINISHED);
1836 status = job->uaiocb._aiocb_private.status;
1837 error = job->uaiocb._aiocb_private.error;
1838 td->td_retval[0] = status;
1839 td->td_ru.ru_oublock += job->outblock;
1840 td->td_ru.ru_inblock += job->inblock;
1841 td->td_ru.ru_msgsnd += job->msgsnd;
1842 td->td_ru.ru_msgrcv += job->msgrcv;
1843 aio_free_entry(job);
1844 AIO_UNLOCK(ki);
1845 ops->store_error(ujob, error);
1846 ops->store_status(ujob, status);
1847 } else {
1848 error = EINVAL;
1849 AIO_UNLOCK(ki);
1850 }
1851 return (error);
1852 }
1853
1854 int
1855 sys_aio_return(struct thread *td, struct aio_return_args *uap)
1856 {
1857
1858 return (kern_aio_return(td, uap->aiocbp, &aiocb_ops));
1859 }
1860
1861 /*
1862 * Allow a process to wakeup when any of the I/O requests are completed.
1863 */
1864 static int
1865 kern_aio_suspend(struct thread *td, int njoblist, struct aiocb **ujoblist,
1866 struct timespec *ts)
1867 {
1868 struct proc *p = td->td_proc;
1869 struct timeval atv;
1870 struct kaioinfo *ki;
1871 struct kaiocb *firstjob, *job;
1872 int error, i, timo;
1873
1874 timo = 0;
1875 if (ts) {
1876 if (ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
1877 return (EINVAL);
1878
1879 TIMESPEC_TO_TIMEVAL(&atv, ts);
1880 if (itimerfix(&atv))
1881 return (EINVAL);
1882 timo = tvtohz(&atv);
1883 }
1884
1885 ki = p->p_aioinfo;
1886 if (ki == NULL)
1887 return (EAGAIN);
1888
1889 if (njoblist == 0)
1890 return (0);
1891
1892 AIO_LOCK(ki);
1893 for (;;) {
1894 firstjob = NULL;
1895 error = 0;
1896 TAILQ_FOREACH(job, &ki->kaio_all, allist) {
1897 for (i = 0; i < njoblist; i++) {
1898 if (job->ujob == ujoblist[i]) {
1899 if (firstjob == NULL)
1900 firstjob = job;
1901 if (job->jobflags & KAIOCB_FINISHED)
1902 goto RETURN;
1903 }
1904 }
1905 }
1906 /* All tasks were finished. */
1907 if (firstjob == NULL)
1908 break;
1909
1910 ki->kaio_flags |= KAIO_WAKEUP;
1911 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
1912 "aiospn", timo);
1913 if (error == ERESTART)
1914 error = EINTR;
1915 if (error)
1916 break;
1917 }
1918 RETURN:
1919 AIO_UNLOCK(ki);
1920 return (error);
1921 }
1922
1923 int
1924 sys_aio_suspend(struct thread *td, struct aio_suspend_args *uap)
1925 {
1926 struct timespec ts, *tsp;
1927 struct aiocb **ujoblist;
1928 int error;
1929
1930 if (uap->nent < 0 || uap->nent > max_aio_queue_per_proc)
1931 return (EINVAL);
1932
1933 if (uap->timeout) {
1934 /* Get timespec struct. */
1935 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
1936 return (error);
1937 tsp = &ts;
1938 } else
1939 tsp = NULL;
1940
1941 ujoblist = malloc(uap->nent * sizeof(ujoblist[0]), M_AIOS, M_WAITOK);
1942 error = copyin(uap->aiocbp, ujoblist, uap->nent * sizeof(ujoblist[0]));
1943 if (error == 0)
1944 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp);
1945 free(ujoblist, M_AIOS);
1946 return (error);
1947 }
1948
1949 /*
1950 * aio_cancel cancels any non-physio aio operations not currently in
1951 * progress.
1952 */
1953 int
1954 sys_aio_cancel(struct thread *td, struct aio_cancel_args *uap)
1955 {
1956 struct proc *p = td->td_proc;
1957 struct kaioinfo *ki;
1958 struct kaiocb *job, *jobn;
1959 struct file *fp;
1960 int error;
1961 int cancelled = 0;
1962 int notcancelled = 0;
1963 struct vnode *vp;
1964
1965 /* Lookup file object. */
1966 error = fget(td, uap->fd, &cap_no_rights, &fp);
1967 if (error)
1968 return (error);
1969
1970 ki = p->p_aioinfo;
1971 if (ki == NULL)
1972 goto done;
1973
1974 if (fp->f_type == DTYPE_VNODE) {
1975 vp = fp->f_vnode;
1976 if (vn_isdisk(vp, &error)) {
1977 fdrop(fp, td);
1978 td->td_retval[0] = AIO_NOTCANCELED;
1979 return (0);
1980 }
1981 }
1982
1983 AIO_LOCK(ki);
1984 TAILQ_FOREACH_SAFE(job, &ki->kaio_jobqueue, plist, jobn) {
1985 if ((uap->fd == job->uaiocb.aio_fildes) &&
1986 ((uap->aiocbp == NULL) ||
1987 (uap->aiocbp == job->ujob))) {
1988 if (aio_cancel_job(p, ki, job)) {
1989 cancelled++;
1990 } else {
1991 notcancelled++;
1992 }
1993 if (uap->aiocbp != NULL)
1994 break;
1995 }
1996 }
1997 AIO_UNLOCK(ki);
1998
1999 done:
2000 fdrop(fp, td);
2001
2002 if (uap->aiocbp != NULL) {
2003 if (cancelled) {
2004 td->td_retval[0] = AIO_CANCELED;
2005 return (0);
2006 }
2007 }
2008
2009 if (notcancelled) {
2010 td->td_retval[0] = AIO_NOTCANCELED;
2011 return (0);
2012 }
2013
2014 if (cancelled) {
2015 td->td_retval[0] = AIO_CANCELED;
2016 return (0);
2017 }
2018
2019 td->td_retval[0] = AIO_ALLDONE;
2020
2021 return (0);
2022 }
2023
2024 /*
2025 * aio_error is implemented in the kernel level for compatibility purposes
2026 * only. For a user mode async implementation, it would be best to do it in
2027 * a userland subroutine.
2028 */
2029 static int
2030 kern_aio_error(struct thread *td, struct aiocb *ujob, struct aiocb_ops *ops)
2031 {
2032 struct proc *p = td->td_proc;
2033 struct kaiocb *job;
2034 struct kaioinfo *ki;
2035 int status;
2036
2037 ki = p->p_aioinfo;
2038 if (ki == NULL) {
2039 td->td_retval[0] = EINVAL;
2040 return (0);
2041 }
2042
2043 AIO_LOCK(ki);
2044 TAILQ_FOREACH(job, &ki->kaio_all, allist) {
2045 if (job->ujob == ujob) {
2046 if (job->jobflags & KAIOCB_FINISHED)
2047 td->td_retval[0] =
2048 job->uaiocb._aiocb_private.error;
2049 else
2050 td->td_retval[0] = EINPROGRESS;
2051 AIO_UNLOCK(ki);
2052 return (0);
2053 }
2054 }
2055 AIO_UNLOCK(ki);
2056
2057 /*
2058 * Hack for failure of aio_aqueue.
2059 */
2060 status = ops->fetch_status(ujob);
2061 if (status == -1) {
2062 td->td_retval[0] = ops->fetch_error(ujob);
2063 return (0);
2064 }
2065
2066 td->td_retval[0] = EINVAL;
2067 return (0);
2068 }
2069
2070 int
2071 sys_aio_error(struct thread *td, struct aio_error_args *uap)
2072 {
2073
2074 return (kern_aio_error(td, uap->aiocbp, &aiocb_ops));
2075 }
2076
2077 /* syscall - asynchronous read from a file (REALTIME) */
2078 #ifdef COMPAT_FREEBSD6
2079 int
2080 freebsd6_aio_read(struct thread *td, struct freebsd6_aio_read_args *uap)
2081 {
2082
2083 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
2084 &aiocb_ops_osigevent));
2085 }
2086 #endif
2087
2088 int
2089 sys_aio_read(struct thread *td, struct aio_read_args *uap)
2090 {
2091
2092 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, &aiocb_ops));
2093 }
2094
2095 /* syscall - asynchronous write to a file (REALTIME) */
2096 #ifdef COMPAT_FREEBSD6
2097 int
2098 freebsd6_aio_write(struct thread *td, struct freebsd6_aio_write_args *uap)
2099 {
2100
2101 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
2102 &aiocb_ops_osigevent));
2103 }
2104 #endif
2105
2106 int
2107 sys_aio_write(struct thread *td, struct aio_write_args *uap)
2108 {
2109
2110 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, &aiocb_ops));
2111 }
2112
2113 int
2114 sys_aio_mlock(struct thread *td, struct aio_mlock_args *uap)
2115 {
2116
2117 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_MLOCK, &aiocb_ops));
2118 }
2119
2120 static int
2121 kern_lio_listio(struct thread *td, int mode, struct aiocb * const *uacb_list,
2122 struct aiocb **acb_list, int nent, struct sigevent *sig,
2123 struct aiocb_ops *ops)
2124 {
2125 struct proc *p = td->td_proc;
2126 struct aiocb *job;
2127 struct kaioinfo *ki;
2128 struct aioliojob *lj;
2129 struct kevent kev;
2130 int error;
2131 int nagain, nerror;
2132 int i;
2133
2134 if ((mode != LIO_NOWAIT) && (mode != LIO_WAIT))
2135 return (EINVAL);
2136
2137 if (nent < 0 || nent > max_aio_queue_per_proc)
2138 return (EINVAL);
2139
2140 if (p->p_aioinfo == NULL)
2141 aio_init_aioinfo(p);
2142
2143 ki = p->p_aioinfo;
2144
2145 lj = uma_zalloc(aiolio_zone, M_WAITOK);
2146 lj->lioj_flags = 0;
2147 lj->lioj_count = 0;
2148 lj->lioj_finished_count = 0;
2149 knlist_init_mtx(&lj->klist, AIO_MTX(ki));
2150 ksiginfo_init(&lj->lioj_ksi);
2151
2152 /*
2153 * Setup signal.
2154 */
2155 if (sig && (mode == LIO_NOWAIT)) {
2156 bcopy(sig, &lj->lioj_signal, sizeof(lj->lioj_signal));
2157 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
2158 /* Assume only new style KEVENT */
2159 memset(&kev, 0, sizeof(kev));
2160 kev.filter = EVFILT_LIO;
2161 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
2162 kev.ident = (uintptr_t)uacb_list; /* something unique */
2163 kev.data = (intptr_t)lj;
2164 /* pass user defined sigval data */
2165 kev.udata = lj->lioj_signal.sigev_value.sival_ptr;
2166 error = kqfd_register(
2167 lj->lioj_signal.sigev_notify_kqueue, &kev, td, 1);
2168 if (error) {
2169 uma_zfree(aiolio_zone, lj);
2170 return (error);
2171 }
2172 } else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) {
2173 ;
2174 } else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
2175 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) {
2176 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
2177 uma_zfree(aiolio_zone, lj);
2178 return EINVAL;
2179 }
2180 lj->lioj_flags |= LIOJ_SIGNAL;
2181 } else {
2182 uma_zfree(aiolio_zone, lj);
2183 return EINVAL;
2184 }
2185 }
2186
2187 AIO_LOCK(ki);
2188 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
2189 /*
2190 * Add extra aiocb count to avoid the lio to be freed
2191 * by other threads doing aio_waitcomplete or aio_return,
2192 * and prevent event from being sent until we have queued
2193 * all tasks.
2194 */
2195 lj->lioj_count = 1;
2196 AIO_UNLOCK(ki);
2197
2198 /*
2199 * Get pointers to the list of I/O requests.
2200 */
2201 nagain = 0;
2202 nerror = 0;
2203 for (i = 0; i < nent; i++) {
2204 job = acb_list[i];
2205 if (job != NULL) {
2206 error = aio_aqueue(td, job, lj, LIO_NOP, ops);
2207 if (error == EAGAIN)
2208 nagain++;
2209 else if (error != 0)
2210 nerror++;
2211 }
2212 }
2213
2214 error = 0;
2215 AIO_LOCK(ki);
2216 if (mode == LIO_WAIT) {
2217 while (lj->lioj_count - 1 != lj->lioj_finished_count) {
2218 ki->kaio_flags |= KAIO_WAKEUP;
2219 error = msleep(&p->p_aioinfo, AIO_MTX(ki),
2220 PRIBIO | PCATCH, "aiospn", 0);
2221 if (error == ERESTART)
2222 error = EINTR;
2223 if (error)
2224 break;
2225 }
2226 } else {
2227 if (lj->lioj_count - 1 == lj->lioj_finished_count) {
2228 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
2229 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
2230 KNOTE_LOCKED(&lj->klist, 1);
2231 }
2232 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
2233 == LIOJ_SIGNAL
2234 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
2235 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
2236 aio_sendsig(p, &lj->lioj_signal,
2237 &lj->lioj_ksi);
2238 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
2239 }
2240 }
2241 }
2242 lj->lioj_count--;
2243 if (lj->lioj_count == 0) {
2244 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
2245 knlist_delete(&lj->klist, curthread, 1);
2246 PROC_LOCK(p);
2247 sigqueue_take(&lj->lioj_ksi);
2248 PROC_UNLOCK(p);
2249 AIO_UNLOCK(ki);
2250 uma_zfree(aiolio_zone, lj);
2251 } else
2252 AIO_UNLOCK(ki);
2253
2254 if (nerror)
2255 return (EIO);
2256 else if (nagain)
2257 return (EAGAIN);
2258 else
2259 return (error);
2260 }
2261
2262 /* syscall - list directed I/O (REALTIME) */
2263 #ifdef COMPAT_FREEBSD6
2264 int
2265 freebsd6_lio_listio(struct thread *td, struct freebsd6_lio_listio_args *uap)
2266 {
2267 struct aiocb **acb_list;
2268 struct sigevent *sigp, sig;
2269 struct osigevent osig;
2270 int error, nent;
2271
2272 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
2273 return (EINVAL);
2274
2275 nent = uap->nent;
2276 if (nent < 0 || nent > max_aio_queue_per_proc)
2277 return (EINVAL);
2278
2279 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2280 error = copyin(uap->sig, &osig, sizeof(osig));
2281 if (error)
2282 return (error);
2283 error = convert_old_sigevent(&osig, &sig);
2284 if (error)
2285 return (error);
2286 sigp = &sig;
2287 } else
2288 sigp = NULL;
2289
2290 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
2291 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0]));
2292 if (error == 0)
2293 error = kern_lio_listio(td, uap->mode,
2294 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
2295 &aiocb_ops_osigevent);
2296 free(acb_list, M_LIO);
2297 return (error);
2298 }
2299 #endif
2300
2301 /* syscall - list directed I/O (REALTIME) */
2302 int
2303 sys_lio_listio(struct thread *td, struct lio_listio_args *uap)
2304 {
2305 struct aiocb **acb_list;
2306 struct sigevent *sigp, sig;
2307 int error, nent;
2308
2309 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
2310 return (EINVAL);
2311
2312 nent = uap->nent;
2313 if (nent < 0 || nent > max_aio_queue_per_proc)
2314 return (EINVAL);
2315
2316 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2317 error = copyin(uap->sig, &sig, sizeof(sig));
2318 if (error)
2319 return (error);
2320 sigp = &sig;
2321 } else
2322 sigp = NULL;
2323
2324 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
2325 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0]));
2326 if (error == 0)
2327 error = kern_lio_listio(td, uap->mode, uap->acb_list, acb_list,
2328 nent, sigp, &aiocb_ops);
2329 free(acb_list, M_LIO);
2330 return (error);
2331 }
2332
2333 static void
2334 aio_physwakeup(struct bio *bp)
2335 {
2336 struct kaiocb *job = (struct kaiocb *)bp->bio_caller1;
2337 struct proc *userp;
2338 struct kaioinfo *ki;
2339 size_t nbytes;
2340 int error, nblks;
2341
2342 /* Release mapping into kernel space. */
2343 userp = job->userproc;
2344 ki = userp->p_aioinfo;
2345 if (job->pbuf) {
2346 pmap_qremove((vm_offset_t)job->pbuf->b_data, job->npages);
2347 relpbuf(job->pbuf, NULL);
2348 job->pbuf = NULL;
2349 atomic_subtract_int(&num_buf_aio, 1);
2350 AIO_LOCK(ki);
2351 ki->kaio_buffer_count--;
2352 AIO_UNLOCK(ki);
2353 } else
2354 atomic_subtract_int(&num_unmapped_aio, 1);
2355 vm_page_unhold_pages(job->pages, job->npages);
2356
2357 bp = job->bp;
2358 job->bp = NULL;
2359 nbytes = job->uaiocb.aio_nbytes - bp->bio_resid;
2360 error = 0;
2361 if (bp->bio_flags & BIO_ERROR)
2362 error = bp->bio_error;
2363 nblks = btodb(nbytes);
2364 if (job->uaiocb.aio_lio_opcode == LIO_WRITE)
2365 job->outblock += nblks;
2366 else
2367 job->inblock += nblks;
2368
2369 if (error)
2370 aio_complete(job, -1, error);
2371 else
2372 aio_complete(job, nbytes, 0);
2373
2374 g_destroy_bio(bp);
2375 }
2376
2377 /* syscall - wait for the next completion of an aio request */
2378 static int
2379 kern_aio_waitcomplete(struct thread *td, struct aiocb **ujobp,
2380 struct timespec *ts, struct aiocb_ops *ops)
2381 {
2382 struct proc *p = td->td_proc;
2383 struct timeval atv;
2384 struct kaioinfo *ki;
2385 struct kaiocb *job;
2386 struct aiocb *ujob;
2387 long error, status;
2388 int timo;
2389
2390 ops->store_aiocb(ujobp, NULL);
2391
2392 if (ts == NULL) {
2393 timo = 0;
2394 } else if (ts->tv_sec == 0 && ts->tv_nsec == 0) {
2395 timo = -1;
2396 } else {
2397 if ((ts->tv_nsec < 0) || (ts->tv_nsec >= 1000000000))
2398 return (EINVAL);
2399
2400 TIMESPEC_TO_TIMEVAL(&atv, ts);
2401 if (itimerfix(&atv))
2402 return (EINVAL);
2403 timo = tvtohz(&atv);
2404 }
2405
2406 if (p->p_aioinfo == NULL)
2407 aio_init_aioinfo(p);
2408 ki = p->p_aioinfo;
2409
2410 error = 0;
2411 job = NULL;
2412 AIO_LOCK(ki);
2413 while ((job = TAILQ_FIRST(&ki->kaio_done)) == NULL) {
2414 if (timo == -1) {
2415 error = EWOULDBLOCK;
2416 break;
2417 }
2418 ki->kaio_flags |= KAIO_WAKEUP;
2419 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
2420 "aiowc", timo);
2421 if (timo && error == ERESTART)
2422 error = EINTR;
2423 if (error)
2424 break;
2425 }
2426
2427 if (job != NULL) {
2428 MPASS(job->jobflags & KAIOCB_FINISHED);
2429 ujob = job->ujob;
2430 status = job->uaiocb._aiocb_private.status;
2431 error = job->uaiocb._aiocb_private.error;
2432 td->td_retval[0] = status;
2433 td->td_ru.ru_oublock += job->outblock;
2434 td->td_ru.ru_inblock += job->inblock;
2435 td->td_ru.ru_msgsnd += job->msgsnd;
2436 td->td_ru.ru_msgrcv += job->msgrcv;
2437 aio_free_entry(job);
2438 AIO_UNLOCK(ki);
2439 ops->store_aiocb(ujobp, ujob);
2440 ops->store_error(ujob, error);
2441 ops->store_status(ujob, status);
2442 } else
2443 AIO_UNLOCK(ki);
2444
2445 return (error);
2446 }
2447
2448 int
2449 sys_aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap)
2450 {
2451 struct timespec ts, *tsp;
2452 int error;
2453
2454 if (uap->timeout) {
2455 /* Get timespec struct. */
2456 error = copyin(uap->timeout, &ts, sizeof(ts));
2457 if (error)
2458 return (error);
2459 tsp = &ts;
2460 } else
2461 tsp = NULL;
2462
2463 return (kern_aio_waitcomplete(td, uap->aiocbp, tsp, &aiocb_ops));
2464 }
2465
2466 static int
2467 kern_aio_fsync(struct thread *td, int op, struct aiocb *ujob,
2468 struct aiocb_ops *ops)
2469 {
2470
2471 if (op != O_SYNC) /* XXX lack of O_DSYNC */
2472 return (EINVAL);
2473 return (aio_aqueue(td, ujob, NULL, LIO_SYNC, ops));
2474 }
2475
2476 int
2477 sys_aio_fsync(struct thread *td, struct aio_fsync_args *uap)
2478 {
2479
2480 return (kern_aio_fsync(td, uap->op, uap->aiocbp, &aiocb_ops));
2481 }
2482
2483 /* kqueue attach function */
2484 static int
2485 filt_aioattach(struct knote *kn)
2486 {
2487 struct kaiocb *job;
2488
2489 job = (struct kaiocb *)(uintptr_t)kn->kn_sdata;
2490
2491 /*
2492 * The job pointer must be validated before using it, so
2493 * registration is restricted to the kernel; the user cannot
2494 * set EV_FLAG1.
2495 */
2496 if ((kn->kn_flags & EV_FLAG1) == 0)
2497 return (EPERM);
2498 kn->kn_ptr.p_aio = job;
2499 kn->kn_flags &= ~EV_FLAG1;
2500
2501 knlist_add(&job->klist, kn, 0);
2502
2503 return (0);
2504 }
2505
2506 /* kqueue detach function */
2507 static void
2508 filt_aiodetach(struct knote *kn)
2509 {
2510 struct knlist *knl;
2511
2512 knl = &kn->kn_ptr.p_aio->klist;
2513 knl->kl_lock(knl->kl_lockarg);
2514 if (!knlist_empty(knl))
2515 knlist_remove(knl, kn, 1);
2516 knl->kl_unlock(knl->kl_lockarg);
2517 }
2518
2519 /* kqueue filter function */
2520 /*ARGSUSED*/
2521 static int
2522 filt_aio(struct knote *kn, long hint)
2523 {
2524 struct kaiocb *job = kn->kn_ptr.p_aio;
2525
2526 kn->kn_data = job->uaiocb._aiocb_private.error;
2527 if (!(job->jobflags & KAIOCB_FINISHED))
2528 return (0);
2529 kn->kn_flags |= EV_EOF;
2530 return (1);
2531 }
2532
2533 /* kqueue attach function */
2534 static int
2535 filt_lioattach(struct knote *kn)
2536 {
2537 struct aioliojob *lj;
2538
2539 lj = (struct aioliojob *)(uintptr_t)kn->kn_sdata;
2540
2541 /*
2542 * The aioliojob pointer must be validated before using it, so
2543 * registration is restricted to the kernel; the user cannot
2544 * set EV_FLAG1.
2545 */
2546 if ((kn->kn_flags & EV_FLAG1) == 0)
2547 return (EPERM);
2548 kn->kn_ptr.p_lio = lj;
2549 kn->kn_flags &= ~EV_FLAG1;
2550
2551 knlist_add(&lj->klist, kn, 0);
2552
2553 return (0);
2554 }
2555
2556 /* kqueue detach function */
2557 static void
2558 filt_liodetach(struct knote *kn)
2559 {
2560 struct knlist *knl;
2561
2562 knl = &kn->kn_ptr.p_lio->klist;
2563 knl->kl_lock(knl->kl_lockarg);
2564 if (!knlist_empty(knl))
2565 knlist_remove(knl, kn, 1);
2566 knl->kl_unlock(knl->kl_lockarg);
2567 }
2568
2569 /* kqueue filter function */
2570 /*ARGSUSED*/
2571 static int
2572 filt_lio(struct knote *kn, long hint)
2573 {
2574 struct aioliojob * lj = kn->kn_ptr.p_lio;
2575
2576 return (lj->lioj_flags & LIOJ_KEVENT_POSTED);
2577 }
2578
2579 #ifdef COMPAT_FREEBSD32
2580 #include <sys/mount.h>
2581 #include <sys/socket.h>
2582 #include <compat/freebsd32/freebsd32.h>
2583 #include <compat/freebsd32/freebsd32_proto.h>
2584 #include <compat/freebsd32/freebsd32_signal.h>
2585 #include <compat/freebsd32/freebsd32_syscall.h>
2586 #include <compat/freebsd32/freebsd32_util.h>
2587
2588 struct __aiocb_private32 {
2589 int32_t status;
2590 int32_t error;
2591 uint32_t kernelinfo;
2592 };
2593
2594 #ifdef COMPAT_FREEBSD6
2595 typedef struct oaiocb32 {
2596 int aio_fildes; /* File descriptor */
2597 uint64_t aio_offset __packed; /* File offset for I/O */
2598 uint32_t aio_buf; /* I/O buffer in process space */
2599 uint32_t aio_nbytes; /* Number of bytes for I/O */
2600 struct osigevent32 aio_sigevent; /* Signal to deliver */
2601 int aio_lio_opcode; /* LIO opcode */
2602 int aio_reqprio; /* Request priority -- ignored */
2603 struct __aiocb_private32 _aiocb_private;
2604 } oaiocb32_t;
2605 #endif
2606
2607 typedef struct aiocb32 {
2608 int32_t aio_fildes; /* File descriptor */
2609 uint64_t aio_offset __packed; /* File offset for I/O */
2610 uint32_t aio_buf; /* I/O buffer in process space */
2611 uint32_t aio_nbytes; /* Number of bytes for I/O */
2612 int __spare__[2];
2613 uint32_t __spare2__;
2614 int aio_lio_opcode; /* LIO opcode */
2615 int aio_reqprio; /* Request priority -- ignored */
2616 struct __aiocb_private32 _aiocb_private;
2617 struct sigevent32 aio_sigevent; /* Signal to deliver */
2618 } aiocb32_t;
2619
2620 #ifdef COMPAT_FREEBSD6
2621 static int
2622 convert_old_sigevent32(struct osigevent32 *osig, struct sigevent *nsig)
2623 {
2624
2625 /*
2626 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are
2627 * supported by AIO with the old sigevent structure.
2628 */
2629 CP(*osig, *nsig, sigev_notify);
2630 switch (nsig->sigev_notify) {
2631 case SIGEV_NONE:
2632 break;
2633 case SIGEV_SIGNAL:
2634 nsig->sigev_signo = osig->__sigev_u.__sigev_signo;
2635 break;
2636 case SIGEV_KEVENT:
2637 nsig->sigev_notify_kqueue =
2638 osig->__sigev_u.__sigev_notify_kqueue;
2639 PTRIN_CP(*osig, *nsig, sigev_value.sival_ptr);
2640 break;
2641 default:
2642 return (EINVAL);
2643 }
2644 return (0);
2645 }
2646
2647 static int
2648 aiocb32_copyin_old_sigevent(struct aiocb *ujob, struct aiocb *kjob)
2649 {
2650 struct oaiocb32 job32;
2651 int error;
2652
2653 bzero(kjob, sizeof(struct aiocb));
2654 error = copyin(ujob, &job32, sizeof(job32));
2655 if (error)
2656 return (error);
2657
2658 CP(job32, *kjob, aio_fildes);
2659 CP(job32, *kjob, aio_offset);
2660 PTRIN_CP(job32, *kjob, aio_buf);
2661 CP(job32, *kjob, aio_nbytes);
2662 CP(job32, *kjob, aio_lio_opcode);
2663 CP(job32, *kjob, aio_reqprio);
2664 CP(job32, *kjob, _aiocb_private.status);
2665 CP(job32, *kjob, _aiocb_private.error);
2666 PTRIN_CP(job32, *kjob, _aiocb_private.kernelinfo);
2667 return (convert_old_sigevent32(&job32.aio_sigevent,
2668 &kjob->aio_sigevent));
2669 }
2670 #endif
2671
2672 static int
2673 aiocb32_copyin(struct aiocb *ujob, struct aiocb *kjob)
2674 {
2675 struct aiocb32 job32;
2676 int error;
2677
2678 error = copyin(ujob, &job32, sizeof(job32));
2679 if (error)
2680 return (error);
2681 CP(job32, *kjob, aio_fildes);
2682 CP(job32, *kjob, aio_offset);
2683 PTRIN_CP(job32, *kjob, aio_buf);
2684 CP(job32, *kjob, aio_nbytes);
2685 CP(job32, *kjob, aio_lio_opcode);
2686 CP(job32, *kjob, aio_reqprio);
2687 CP(job32, *kjob, _aiocb_private.status);
2688 CP(job32, *kjob, _aiocb_private.error);
2689 PTRIN_CP(job32, *kjob, _aiocb_private.kernelinfo);
2690 return (convert_sigevent32(&job32.aio_sigevent, &kjob->aio_sigevent));
2691 }
2692
2693 static long
2694 aiocb32_fetch_status(struct aiocb *ujob)
2695 {
2696 struct aiocb32 *ujob32;
2697
2698 ujob32 = (struct aiocb32 *)ujob;
2699 return (fuword32(&ujob32->_aiocb_private.status));
2700 }
2701
2702 static long
2703 aiocb32_fetch_error(struct aiocb *ujob)
2704 {
2705 struct aiocb32 *ujob32;
2706
2707 ujob32 = (struct aiocb32 *)ujob;
2708 return (fuword32(&ujob32->_aiocb_private.error));
2709 }
2710
2711 static int
2712 aiocb32_store_status(struct aiocb *ujob, long status)
2713 {
2714 struct aiocb32 *ujob32;
2715
2716 ujob32 = (struct aiocb32 *)ujob;
2717 return (suword32(&ujob32->_aiocb_private.status, status));
2718 }
2719
2720 static int
2721 aiocb32_store_error(struct aiocb *ujob, long error)
2722 {
2723 struct aiocb32 *ujob32;
2724
2725 ujob32 = (struct aiocb32 *)ujob;
2726 return (suword32(&ujob32->_aiocb_private.error, error));
2727 }
2728
2729 static int
2730 aiocb32_store_kernelinfo(struct aiocb *ujob, long jobref)
2731 {
2732 struct aiocb32 *ujob32;
2733
2734 ujob32 = (struct aiocb32 *)ujob;
2735 return (suword32(&ujob32->_aiocb_private.kernelinfo, jobref));
2736 }
2737
2738 static int
2739 aiocb32_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob)
2740 {
2741
2742 return (suword32(ujobp, (long)ujob));
2743 }
2744
2745 static struct aiocb_ops aiocb32_ops = {
2746 .copyin = aiocb32_copyin,
2747 .fetch_status = aiocb32_fetch_status,
2748 .fetch_error = aiocb32_fetch_error,
2749 .store_status = aiocb32_store_status,
2750 .store_error = aiocb32_store_error,
2751 .store_kernelinfo = aiocb32_store_kernelinfo,
2752 .store_aiocb = aiocb32_store_aiocb,
2753 };
2754
2755 #ifdef COMPAT_FREEBSD6
2756 static struct aiocb_ops aiocb32_ops_osigevent = {
2757 .copyin = aiocb32_copyin_old_sigevent,
2758 .fetch_status = aiocb32_fetch_status,
2759 .fetch_error = aiocb32_fetch_error,
2760 .store_status = aiocb32_store_status,
2761 .store_error = aiocb32_store_error,
2762 .store_kernelinfo = aiocb32_store_kernelinfo,
2763 .store_aiocb = aiocb32_store_aiocb,
2764 };
2765 #endif
2766
2767 int
2768 freebsd32_aio_return(struct thread *td, struct freebsd32_aio_return_args *uap)
2769 {
2770
2771 return (kern_aio_return(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops));
2772 }
2773
2774 int
2775 freebsd32_aio_suspend(struct thread *td, struct freebsd32_aio_suspend_args *uap)
2776 {
2777 struct timespec32 ts32;
2778 struct timespec ts, *tsp;
2779 struct aiocb **ujoblist;
2780 uint32_t *ujoblist32;
2781 int error, i;
2782
2783 if (uap->nent < 0 || uap->nent > max_aio_queue_per_proc)
2784 return (EINVAL);
2785
2786 if (uap->timeout) {
2787 /* Get timespec struct. */
2788 if ((error = copyin(uap->timeout, &ts32, sizeof(ts32))) != 0)
2789 return (error);
2790 CP(ts32, ts, tv_sec);
2791 CP(ts32, ts, tv_nsec);
2792 tsp = &ts;
2793 } else
2794 tsp = NULL;
2795
2796 ujoblist = malloc(uap->nent * sizeof(ujoblist[0]), M_AIOS, M_WAITOK);
2797 ujoblist32 = (uint32_t *)ujoblist;
2798 error = copyin(uap->aiocbp, ujoblist32, uap->nent *
2799 sizeof(ujoblist32[0]));
2800 if (error == 0) {
2801 for (i = uap->nent - 1; i >= 0; i--)
2802 ujoblist[i] = PTRIN(ujoblist32[i]);
2803
2804 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp);
2805 }
2806 free(ujoblist, M_AIOS);
2807 return (error);
2808 }
2809
2810 int
2811 freebsd32_aio_error(struct thread *td, struct freebsd32_aio_error_args *uap)
2812 {
2813
2814 return (kern_aio_error(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops));
2815 }
2816
2817 #ifdef COMPAT_FREEBSD6
2818 int
2819 freebsd6_freebsd32_aio_read(struct thread *td,
2820 struct freebsd6_freebsd32_aio_read_args *uap)
2821 {
2822
2823 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
2824 &aiocb32_ops_osigevent));
2825 }
2826 #endif
2827
2828 int
2829 freebsd32_aio_read(struct thread *td, struct freebsd32_aio_read_args *uap)
2830 {
2831
2832 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
2833 &aiocb32_ops));
2834 }
2835
2836 #ifdef COMPAT_FREEBSD6
2837 int
2838 freebsd6_freebsd32_aio_write(struct thread *td,
2839 struct freebsd6_freebsd32_aio_write_args *uap)
2840 {
2841
2842 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
2843 &aiocb32_ops_osigevent));
2844 }
2845 #endif
2846
2847 int
2848 freebsd32_aio_write(struct thread *td, struct freebsd32_aio_write_args *uap)
2849 {
2850
2851 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
2852 &aiocb32_ops));
2853 }
2854
2855 int
2856 freebsd32_aio_mlock(struct thread *td, struct freebsd32_aio_mlock_args *uap)
2857 {
2858
2859 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_MLOCK,
2860 &aiocb32_ops));
2861 }
2862
2863 int
2864 freebsd32_aio_waitcomplete(struct thread *td,
2865 struct freebsd32_aio_waitcomplete_args *uap)
2866 {
2867 struct timespec32 ts32;
2868 struct timespec ts, *tsp;
2869 int error;
2870
2871 if (uap->timeout) {
2872 /* Get timespec struct. */
2873 error = copyin(uap->timeout, &ts32, sizeof(ts32));
2874 if (error)
2875 return (error);
2876 CP(ts32, ts, tv_sec);
2877 CP(ts32, ts, tv_nsec);
2878 tsp = &ts;
2879 } else
2880 tsp = NULL;
2881
2882 return (kern_aio_waitcomplete(td, (struct aiocb **)uap->aiocbp, tsp,
2883 &aiocb32_ops));
2884 }
2885
2886 int
2887 freebsd32_aio_fsync(struct thread *td, struct freebsd32_aio_fsync_args *uap)
2888 {
2889
2890 return (kern_aio_fsync(td, uap->op, (struct aiocb *)uap->aiocbp,
2891 &aiocb32_ops));
2892 }
2893
2894 #ifdef COMPAT_FREEBSD6
2895 int
2896 freebsd6_freebsd32_lio_listio(struct thread *td,
2897 struct freebsd6_freebsd32_lio_listio_args *uap)
2898 {
2899 struct aiocb **acb_list;
2900 struct sigevent *sigp, sig;
2901 struct osigevent32 osig;
2902 uint32_t *acb_list32;
2903 int error, i, nent;
2904
2905 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
2906 return (EINVAL);
2907
2908 nent = uap->nent;
2909 if (nent < 0 || nent > max_aio_queue_per_proc)
2910 return (EINVAL);
2911
2912 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2913 error = copyin(uap->sig, &osig, sizeof(osig));
2914 if (error)
2915 return (error);
2916 error = convert_old_sigevent32(&osig, &sig);
2917 if (error)
2918 return (error);
2919 sigp = &sig;
2920 } else
2921 sigp = NULL;
2922
2923 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK);
2924 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t));
2925 if (error) {
2926 free(acb_list32, M_LIO);
2927 return (error);
2928 }
2929 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
2930 for (i = 0; i < nent; i++)
2931 acb_list[i] = PTRIN(acb_list32[i]);
2932 free(acb_list32, M_LIO);
2933
2934 error = kern_lio_listio(td, uap->mode,
2935 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
2936 &aiocb32_ops_osigevent);
2937 free(acb_list, M_LIO);
2938 return (error);
2939 }
2940 #endif
2941
2942 int
2943 freebsd32_lio_listio(struct thread *td, struct freebsd32_lio_listio_args *uap)
2944 {
2945 struct aiocb **acb_list;
2946 struct sigevent *sigp, sig;
2947 struct sigevent32 sig32;
2948 uint32_t *acb_list32;
2949 int error, i, nent;
2950
2951 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
2952 return (EINVAL);
2953
2954 nent = uap->nent;
2955 if (nent < 0 || nent > max_aio_queue_per_proc)
2956 return (EINVAL);
2957
2958 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2959 error = copyin(uap->sig, &sig32, sizeof(sig32));
2960 if (error)
2961 return (error);
2962 error = convert_sigevent32(&sig32, &sig);
2963 if (error)
2964 return (error);
2965 sigp = &sig;
2966 } else
2967 sigp = NULL;
2968
2969 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK);
2970 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t));
2971 if (error) {
2972 free(acb_list32, M_LIO);
2973 return (error);
2974 }
2975 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
2976 for (i = 0; i < nent; i++)
2977 acb_list[i] = PTRIN(acb_list32[i]);
2978 free(acb_list32, M_LIO);
2979
2980 error = kern_lio_listio(td, uap->mode,
2981 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
2982 &aiocb32_ops);
2983 free(acb_list, M_LIO);
2984 return (error);
2985 }
2986
2987 #endif
Cache object: 69c43a4c856720a6848ddeba9d67256a
|