1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
24 #include <sys/systm.h>
25 #include <sys/malloc.h>
26 #include <sys/bio.h>
27 #include <sys/buf.h>
28 #include <sys/capsicum.h>
29 #include <sys/eventhandler.h>
30 #include <sys/sysproto.h>
31 #include <sys/filedesc.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/kthread.h>
35 #include <sys/fcntl.h>
36 #include <sys/file.h>
37 #include <sys/limits.h>
38 #include <sys/lock.h>
39 #include <sys/mutex.h>
40 #include <sys/unistd.h>
41 #include <sys/posix4.h>
42 #include <sys/proc.h>
43 #include <sys/resourcevar.h>
44 #include <sys/signalvar.h>
45 #include <sys/syscallsubr.h>
46 #include <sys/protosw.h>
47 #include <sys/rwlock.h>
48 #include <sys/sema.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/syscall.h>
52 #include <sys/sysctl.h>
53 #include <sys/syslog.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 #include <geom/geom.h>
61
62 #include <machine/atomic.h>
63
64 #include <vm/vm.h>
65 #include <vm/vm_page.h>
66 #include <vm/vm_extern.h>
67 #include <vm/pmap.h>
68 #include <vm/vm_map.h>
69 #include <vm/vm_object.h>
70 #include <vm/vnode_pager.h>
71 #include <vm/uma.h>
72 #include <sys/aio.h>
73
74 /*
75 * Counter for allocating reference ids to new jobs. Wrapped to 1 on
76 * overflow. (XXX will be removed soon.)
77 */
78 static u_long jobrefid;
79
80 /*
81 * Counter for aio_fsync.
82 */
83 static uint64_t jobseqno;
84
85 #ifndef MAX_AIO_PER_PROC
86 #define MAX_AIO_PER_PROC 32
87 #endif
88
89 #ifndef MAX_AIO_QUEUE_PER_PROC
90 #define MAX_AIO_QUEUE_PER_PROC 256
91 #endif
92
93 #ifndef MAX_AIO_QUEUE
94 #define MAX_AIO_QUEUE 1024 /* Bigger than MAX_AIO_QUEUE_PER_PROC */
95 #endif
96
97 #ifndef MAX_BUF_AIO
98 #define MAX_BUF_AIO 16
99 #endif
100
101 FEATURE(aio, "Asynchronous I/O");
102 SYSCTL_DECL(_p1003_1b);
103
104 static MALLOC_DEFINE(M_LIO, "lio", "listio aio control block list");
105 static MALLOC_DEFINE(M_AIO, "aio", "structures for asynchronous I/O");
106
107 static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
108 "Async IO management");
109
110 static int enable_aio_unsafe = 0;
111 SYSCTL_INT(_vfs_aio, OID_AUTO, enable_unsafe, CTLFLAG_RW, &enable_aio_unsafe, 0,
112 "Permit asynchronous IO on all file types, not just known-safe types");
113
114 static unsigned int unsafe_warningcnt = 1;
115 SYSCTL_UINT(_vfs_aio, OID_AUTO, unsafe_warningcnt, CTLFLAG_RW,
116 &unsafe_warningcnt, 0,
117 "Warnings that will be triggered upon failed IO requests on unsafe files");
118
119 static int max_aio_procs = MAX_AIO_PROCS;
120 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, CTLFLAG_RW, &max_aio_procs, 0,
121 "Maximum number of kernel processes to use for handling async IO ");
122
123 static int num_aio_procs = 0;
124 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, CTLFLAG_RD, &num_aio_procs, 0,
125 "Number of presently active kernel processes for async IO");
126
127 /*
128 * The code will adjust the actual number of AIO processes towards this
129 * number when it gets a chance.
130 */
131 static int target_aio_procs = TARGET_AIO_PROCS;
132 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs,
133 0,
134 "Preferred number of ready kernel processes for async IO");
135
136 static int max_queue_count = MAX_AIO_QUEUE;
137 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0,
138 "Maximum number of aio requests to queue, globally");
139
140 static int num_queue_count = 0;
141 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0,
142 "Number of queued aio requests");
143
144 static int num_buf_aio = 0;
145 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
146 "Number of aio requests presently handled by the buf subsystem");
147
148 static int num_unmapped_aio = 0;
149 SYSCTL_INT(_vfs_aio, OID_AUTO, num_unmapped_aio, CTLFLAG_RD, &num_unmapped_aio,
150 0,
151 "Number of aio requests presently handled by unmapped I/O buffers");
152
153 /* Number of async I/O processes in the process of being started */
154 /* XXX This should be local to aio_aqueue() */
155 static int num_aio_resv_start = 0;
156
157 static int aiod_lifetime;
158 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0,
159 "Maximum lifetime for idle aiod");
160
161 static int max_aio_per_proc = MAX_AIO_PER_PROC;
162 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
163 0,
164 "Maximum active aio requests per process");
165
166 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
167 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
168 &max_aio_queue_per_proc, 0,
169 "Maximum queued aio requests per process");
170
171 static int max_buf_aio = MAX_BUF_AIO;
172 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
173 "Maximum buf aio requests per process");
174
175 /*
176 * Though redundant with vfs.aio.max_aio_queue_per_proc, POSIX requires
177 * sysconf(3) to support AIO_LISTIO_MAX, and we implement that with
178 * vfs.aio.aio_listio_max.
179 */
180 SYSCTL_INT(_p1003_1b, CTL_P1003_1B_AIO_LISTIO_MAX, aio_listio_max,
181 CTLFLAG_RD | CTLFLAG_CAPRD, &max_aio_queue_per_proc,
182 0, "Maximum aio requests for a single lio_listio call");
183
184 #ifdef COMPAT_FREEBSD6
185 typedef struct oaiocb {
186 int aio_fildes; /* File descriptor */
187 off_t aio_offset; /* File offset for I/O */
188 volatile void *aio_buf; /* I/O buffer in process space */
189 size_t aio_nbytes; /* Number of bytes for I/O */
190 struct osigevent aio_sigevent; /* Signal to deliver */
191 int aio_lio_opcode; /* LIO opcode */
192 int aio_reqprio; /* Request priority -- ignored */
193 struct __aiocb_private _aiocb_private;
194 } oaiocb_t;
195 #endif
196
197 /*
198 * Below is a key of locks used to protect each member of struct kaiocb
199 * aioliojob and kaioinfo and any backends.
200 *
201 * * - need not protected
202 * a - locked by kaioinfo lock
203 * b - locked by backend lock, the backend lock can be null in some cases,
204 * for example, BIO belongs to this type, in this case, proc lock is
205 * reused.
206 * c - locked by aio_job_mtx, the lock for the generic file I/O backend.
207 */
208
209 /*
210 * If the routine that services an AIO request blocks while running in an
211 * AIO kernel process it can starve other I/O requests. BIO requests
212 * queued via aio_qbio() complete asynchronously and do not use AIO kernel
213 * processes at all. Socket I/O requests use a separate pool of
214 * kprocs and also force non-blocking I/O. Other file I/O requests
215 * use the generic fo_read/fo_write operations which can block. The
216 * fsync and mlock operations can also block while executing. Ideally
217 * none of these requests would block while executing.
218 *
219 * Note that the service routines cannot toggle O_NONBLOCK in the file
220 * structure directly while handling a request due to races with
221 * userland threads.
222 */
223
224 /* jobflags */
225 #define KAIOCB_QUEUEING 0x01
226 #define KAIOCB_CANCELLED 0x02
227 #define KAIOCB_CANCELLING 0x04
228 #define KAIOCB_CHECKSYNC 0x08
229 #define KAIOCB_CLEARED 0x10
230 #define KAIOCB_FINISHED 0x20
231
232 /* ioflags */
233 #define KAIOCB_IO_FOFFSET 0x01
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) count of jobs */
252 int lioj_finished_count; /* (a) count of finished jobs */
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 bio 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 (*aio_copyin)(struct aiocb *ujob, struct kaiocb *kjob, int ty);
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 static void aio_biocleanup(struct bio *bp);
311 void aio_init_aioinfo(struct proc *p);
312 static int aio_onceonly(void);
313 static int aio_free_entry(struct kaiocb *job);
314 static void aio_process_rw(struct kaiocb *job);
315 static void aio_process_sync(struct kaiocb *job);
316 static void aio_process_mlock(struct kaiocb *job);
317 static void aio_schedule_fsync(void *context, int pending);
318 static int aio_newproc(int *);
319 int aio_aqueue(struct thread *td, struct aiocb *ujob,
320 struct aioliojob *lio, int type, struct aiocb_ops *ops);
321 static int aio_queue_file(struct file *fp, struct kaiocb *job);
322 static void aio_biowakeup(struct bio *bp);
323 static void aio_proc_rundown(void *arg, struct proc *p);
324 static void aio_proc_rundown_exec(void *arg, struct proc *p,
325 struct image_params *imgp);
326 static int aio_qbio(struct proc *p, struct kaiocb *job);
327 static void aio_daemon(void *param);
328 static void aio_bio_done_notify(struct proc *userp, struct kaiocb *job);
329 static bool aio_clear_cancel_function_locked(struct kaiocb *job);
330 static int aio_kick(struct proc *userp);
331 static void aio_kick_nowait(struct proc *userp);
332 static void aio_kick_helper(void *context, int pending);
333 static int filt_aioattach(struct knote *kn);
334 static void filt_aiodetach(struct knote *kn);
335 static int filt_aio(struct knote *kn, long hint);
336 static int filt_lioattach(struct knote *kn);
337 static void filt_liodetach(struct knote *kn);
338 static int filt_lio(struct knote *kn, long hint);
339
340 /*
341 * Zones for:
342 * kaio Per process async io info
343 * aiocb async io jobs
344 * aiolio list io jobs
345 */
346 static uma_zone_t kaio_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
aio_modload(struct module * module,int cmd,void * arg)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
aio_onceonly(void)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, 0);
416 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct kaiocb), NULL, NULL,
417 NULL, NULL, UMA_ALIGN_PTR, 0);
418 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL,
419 NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
420 aiod_lifetime = AIOD_LIFETIME_DEFAULT;
421 jobrefid = 1;
422 p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, _POSIX_ASYNCHRONOUS_IO);
423 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE);
424 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0);
425
426 return (0);
427 }
428
429 /*
430 * Init the per-process aioinfo structure. The aioinfo limits are set
431 * per-process for user limit (resource) management.
432 */
433 void
aio_init_aioinfo(struct proc * p)434 aio_init_aioinfo(struct proc *p)
435 {
436 struct kaioinfo *ki;
437
438 ki = uma_zalloc(kaio_zone, M_WAITOK);
439 mtx_init(&ki->kaio_mtx, "aiomtx", NULL, MTX_DEF | MTX_NEW);
440 ki->kaio_flags = 0;
441 ki->kaio_active_count = 0;
442 ki->kaio_count = 0;
443 ki->kaio_buffer_count = 0;
444 TAILQ_INIT(&ki->kaio_all);
445 TAILQ_INIT(&ki->kaio_done);
446 TAILQ_INIT(&ki->kaio_jobqueue);
447 TAILQ_INIT(&ki->kaio_liojoblist);
448 TAILQ_INIT(&ki->kaio_syncqueue);
449 TAILQ_INIT(&ki->kaio_syncready);
450 TASK_INIT(&ki->kaio_task, 0, aio_kick_helper, p);
451 TASK_INIT(&ki->kaio_sync_task, 0, aio_schedule_fsync, ki);
452 PROC_LOCK(p);
453 if (p->p_aioinfo == NULL) {
454 p->p_aioinfo = ki;
455 PROC_UNLOCK(p);
456 } else {
457 PROC_UNLOCK(p);
458 mtx_destroy(&ki->kaio_mtx);
459 uma_zfree(kaio_zone, ki);
460 }
461
462 while (num_aio_procs < MIN(target_aio_procs, max_aio_procs))
463 aio_newproc(NULL);
464 }
465
466 static int
aio_sendsig(struct proc * p,struct sigevent * sigev,ksiginfo_t * ksi,bool ext)467 aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi, bool ext)
468 {
469 struct thread *td;
470 int error;
471
472 error = sigev_findtd(p, sigev, &td);
473 if (error)
474 return (error);
475 if (!KSI_ONQ(ksi)) {
476 ksiginfo_set_sigev(ksi, sigev);
477 ksi->ksi_code = SI_ASYNCIO;
478 ksi->ksi_flags |= ext ? (KSI_EXT | KSI_INS) : 0;
479 tdsendsignal(p, td, ksi->ksi_signo, ksi);
480 }
481 PROC_UNLOCK(p);
482 return (error);
483 }
484
485 /*
486 * Free a job entry. Wait for completion if it is currently active, but don't
487 * delay forever. If we delay, we return a flag that says that we have to
488 * restart the queue scan.
489 */
490 static int
aio_free_entry(struct kaiocb * job)491 aio_free_entry(struct kaiocb *job)
492 {
493 struct kaioinfo *ki;
494 struct aioliojob *lj;
495 struct proc *p;
496
497 p = job->userproc;
498 MPASS(curproc == p);
499 ki = p->p_aioinfo;
500 MPASS(ki != NULL);
501
502 AIO_LOCK_ASSERT(ki, MA_OWNED);
503 MPASS(job->jobflags & KAIOCB_FINISHED);
504
505 atomic_subtract_int(&num_queue_count, 1);
506
507 ki->kaio_count--;
508 MPASS(ki->kaio_count >= 0);
509
510 TAILQ_REMOVE(&ki->kaio_done, job, plist);
511 TAILQ_REMOVE(&ki->kaio_all, job, allist);
512
513 lj = job->lio;
514 if (lj) {
515 lj->lioj_count--;
516 lj->lioj_finished_count--;
517
518 if (lj->lioj_count == 0) {
519 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
520 /* lio is going away, we need to destroy any knotes */
521 knlist_delete(&lj->klist, curthread, 1);
522 PROC_LOCK(p);
523 sigqueue_take(&lj->lioj_ksi);
524 PROC_UNLOCK(p);
525 uma_zfree(aiolio_zone, lj);
526 }
527 }
528
529 /* job is going away, we need to destroy any knotes */
530 knlist_delete(&job->klist, curthread, 1);
531 PROC_LOCK(p);
532 sigqueue_take(&job->ksi);
533 PROC_UNLOCK(p);
534
535 AIO_UNLOCK(ki);
536
537 /*
538 * The thread argument here is used to find the owning process
539 * and is also passed to fo_close() which may pass it to various
540 * places such as devsw close() routines. Because of that, we
541 * need a thread pointer from the process owning the job that is
542 * persistent and won't disappear out from under us or move to
543 * another process.
544 *
545 * Currently, all the callers of this function call it to remove
546 * a kaiocb from the current process' job list either via a
547 * syscall or due to the current process calling exit() or
548 * execve(). Thus, we know that p == curproc. We also know that
549 * curthread can't exit since we are curthread.
550 *
551 * Therefore, we use curthread as the thread to pass to
552 * knlist_delete(). This does mean that it is possible for the
553 * thread pointer at close time to differ from the thread pointer
554 * at open time, but this is already true of file descriptors in
555 * a multithreaded process.
556 */
557 if (job->fd_file)
558 fdrop(job->fd_file, curthread);
559 crfree(job->cred);
560 if (job->uiop != &job->uio)
561 freeuio(job->uiop);
562 uma_zfree(aiocb_zone, job);
563 AIO_LOCK(ki);
564
565 return (0);
566 }
567
568 static void
aio_proc_rundown_exec(void * arg,struct proc * p,struct image_params * imgp __unused)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
aio_cancel_job(struct proc * p,struct kaioinfo * ki,struct kaiocb * job)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
aio_proc_rundown(void * arg,struct proc * p)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 *
aio_selectjob(struct aioproc * aiop)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 and fdatasync syscalls.
719 */
720 static int
aio_fsync_vnode(struct thread * td,struct vnode * vp,int op)721 aio_fsync_vnode(struct thread *td, struct vnode *vp, int op)
722 {
723 struct mount *mp;
724 int error;
725
726 for (;;) {
727 error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH);
728 if (error != 0)
729 break;
730 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
731 vnode_pager_clean_async(vp);
732 if (op == LIO_DSYNC)
733 error = VOP_FDATASYNC(vp, td);
734 else
735 error = VOP_FSYNC(vp, MNT_WAIT, td);
736
737 VOP_UNLOCK(vp);
738 vn_finished_write(mp);
739 if (error != ERELOOKUP)
740 break;
741 }
742 return (error);
743 }
744
745 /*
746 * The AIO processing activity for LIO_READ/LIO_WRITE. This is the code that
747 * does the I/O request for the non-bio version of the operations. The normal
748 * vn operations are used, and this code should work in all instances for every
749 * type of file, including pipes, sockets, fifos, and regular files.
750 *
751 * XXX I don't think it works well for socket, pipe, and fifo.
752 */
753 static void
aio_process_rw(struct kaiocb * job)754 aio_process_rw(struct kaiocb *job)
755 {
756 struct ucred *td_savedcred;
757 struct thread *td;
758 struct file *fp;
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, opcode;
765
766 KASSERT(job->uaiocb.aio_lio_opcode == LIO_READ ||
767 job->uaiocb.aio_lio_opcode == LIO_READV ||
768 job->uaiocb.aio_lio_opcode == LIO_WRITE ||
769 job->uaiocb.aio_lio_opcode == LIO_WRITEV,
770 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode));
771
772 aio_switch_vmspace(job);
773 td = curthread;
774 td_savedcred = td->td_ucred;
775 td->td_ucred = job->cred;
776 job->uiop->uio_td = td;
777 fp = job->fd_file;
778
779 opcode = job->uaiocb.aio_lio_opcode;
780 cnt = job->uiop->uio_resid;
781
782 msgrcv_st = td->td_ru.ru_msgrcv;
783 msgsnd_st = td->td_ru.ru_msgsnd;
784 inblock_st = td->td_ru.ru_inblock;
785 oublock_st = td->td_ru.ru_oublock;
786
787 /*
788 * aio_aqueue() acquires a reference to the file that is
789 * released in aio_free_entry().
790 */
791 if (opcode == LIO_READ || opcode == LIO_READV) {
792 if (job->uiop->uio_resid == 0)
793 error = 0;
794 else
795 error = fo_read(fp, job->uiop, fp->f_cred,
796 (job->ioflags & KAIOCB_IO_FOFFSET) != 0 ? 0 :
797 FOF_OFFSET, td);
798 } else {
799 if (fp->f_type == DTYPE_VNODE)
800 bwillwrite();
801 error = fo_write(fp, job->uiop, fp->f_cred, (job->ioflags &
802 KAIOCB_IO_FOFFSET) != 0 ? 0 : FOF_OFFSET, td);
803 }
804 msgrcv_end = td->td_ru.ru_msgrcv;
805 msgsnd_end = td->td_ru.ru_msgsnd;
806 inblock_end = td->td_ru.ru_inblock;
807 oublock_end = td->td_ru.ru_oublock;
808
809 job->msgrcv = msgrcv_end - msgrcv_st;
810 job->msgsnd = msgsnd_end - msgsnd_st;
811 job->inblock = inblock_end - inblock_st;
812 job->outblock = oublock_end - oublock_st;
813
814 if (error != 0 && job->uiop->uio_resid != cnt) {
815 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
816 error = 0;
817 if (error == EPIPE && (opcode & LIO_WRITE)) {
818 PROC_LOCK(job->userproc);
819 kern_psignal(job->userproc, SIGPIPE);
820 PROC_UNLOCK(job->userproc);
821 }
822 }
823
824 cnt -= job->uiop->uio_resid;
825 td->td_ucred = td_savedcred;
826 if (error)
827 aio_complete(job, -1, error);
828 else
829 aio_complete(job, cnt, 0);
830 }
831
832 static void
aio_process_sync(struct kaiocb * job)833 aio_process_sync(struct kaiocb *job)
834 {
835 struct thread *td = curthread;
836 struct ucred *td_savedcred = td->td_ucred;
837 struct file *fp = job->fd_file;
838 int error = 0;
839
840 KASSERT(job->uaiocb.aio_lio_opcode & LIO_SYNC,
841 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode));
842
843 td->td_ucred = job->cred;
844 if (fp->f_vnode != NULL) {
845 error = aio_fsync_vnode(td, fp->f_vnode,
846 job->uaiocb.aio_lio_opcode);
847 }
848 td->td_ucred = td_savedcred;
849 if (error)
850 aio_complete(job, -1, error);
851 else
852 aio_complete(job, 0, 0);
853 }
854
855 static void
aio_process_mlock(struct kaiocb * job)856 aio_process_mlock(struct kaiocb *job)
857 {
858 struct aiocb *cb = &job->uaiocb;
859 int error;
860
861 KASSERT(job->uaiocb.aio_lio_opcode == LIO_MLOCK,
862 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode));
863
864 aio_switch_vmspace(job);
865 error = kern_mlock(job->userproc, job->cred,
866 __DEVOLATILE(uintptr_t, cb->aio_buf), cb->aio_nbytes);
867 aio_complete(job, error != 0 ? -1 : 0, error);
868 }
869
870 static void
aio_bio_done_notify(struct proc * userp,struct kaiocb * job)871 aio_bio_done_notify(struct proc *userp, struct kaiocb *job)
872 {
873 struct aioliojob *lj;
874 struct kaioinfo *ki;
875 struct kaiocb *sjob, *sjobn;
876 int lj_done;
877 bool schedule_fsync;
878
879 ki = userp->p_aioinfo;
880 AIO_LOCK_ASSERT(ki, MA_OWNED);
881 lj = job->lio;
882 lj_done = 0;
883 if (lj) {
884 lj->lioj_finished_count++;
885 if (lj->lioj_count == lj->lioj_finished_count)
886 lj_done = 1;
887 }
888 TAILQ_INSERT_TAIL(&ki->kaio_done, job, plist);
889 MPASS(job->jobflags & KAIOCB_FINISHED);
890
891 if (ki->kaio_flags & KAIO_RUNDOWN)
892 goto notification_done;
893
894 if (job->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
895 job->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID)
896 aio_sendsig(userp, &job->uaiocb.aio_sigevent, &job->ksi, true);
897
898 KNOTE_LOCKED(&job->klist, 1);
899
900 if (lj_done) {
901 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
902 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
903 KNOTE_LOCKED(&lj->klist, 1);
904 }
905 if ((lj->lioj_flags & (LIOJ_SIGNAL | LIOJ_SIGNAL_POSTED))
906 == LIOJ_SIGNAL &&
907 (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
908 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
909 aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi,
910 true);
911 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
912 }
913 }
914
915 notification_done:
916 if (job->jobflags & KAIOCB_CHECKSYNC) {
917 schedule_fsync = false;
918 TAILQ_FOREACH_SAFE(sjob, &ki->kaio_syncqueue, list, sjobn) {
919 if (job->fd_file != sjob->fd_file ||
920 job->seqno >= sjob->seqno)
921 continue;
922 if (--sjob->pending > 0)
923 continue;
924 TAILQ_REMOVE(&ki->kaio_syncqueue, sjob, list);
925 if (!aio_clear_cancel_function_locked(sjob))
926 continue;
927 TAILQ_INSERT_TAIL(&ki->kaio_syncready, sjob, list);
928 schedule_fsync = true;
929 }
930 if (schedule_fsync)
931 taskqueue_enqueue(taskqueue_aiod_kick,
932 &ki->kaio_sync_task);
933 }
934 if (ki->kaio_flags & KAIO_WAKEUP) {
935 ki->kaio_flags &= ~KAIO_WAKEUP;
936 wakeup(&userp->p_aioinfo);
937 }
938 }
939
940 static void
aio_schedule_fsync(void * context,int pending)941 aio_schedule_fsync(void *context, int pending)
942 {
943 struct kaioinfo *ki;
944 struct kaiocb *job;
945
946 ki = context;
947 AIO_LOCK(ki);
948 while (!TAILQ_EMPTY(&ki->kaio_syncready)) {
949 job = TAILQ_FIRST(&ki->kaio_syncready);
950 TAILQ_REMOVE(&ki->kaio_syncready, job, list);
951 AIO_UNLOCK(ki);
952 aio_schedule(job, aio_process_sync);
953 AIO_LOCK(ki);
954 }
955 AIO_UNLOCK(ki);
956 }
957
958 bool
aio_cancel_cleared(struct kaiocb * job)959 aio_cancel_cleared(struct kaiocb *job)
960 {
961
962 /*
963 * The caller should hold the same queue lock held when
964 * aio_clear_cancel_function() was called and set this flag
965 * ensuring this check sees an up-to-date value. However,
966 * there is no way to assert that.
967 */
968 return ((job->jobflags & KAIOCB_CLEARED) != 0);
969 }
970
971 static bool
aio_clear_cancel_function_locked(struct kaiocb * job)972 aio_clear_cancel_function_locked(struct kaiocb *job)
973 {
974
975 AIO_LOCK_ASSERT(job->userproc->p_aioinfo, MA_OWNED);
976 MPASS(job->cancel_fn != NULL);
977 if (job->jobflags & KAIOCB_CANCELLING) {
978 job->jobflags |= KAIOCB_CLEARED;
979 return (false);
980 }
981 job->cancel_fn = NULL;
982 return (true);
983 }
984
985 bool
aio_clear_cancel_function(struct kaiocb * job)986 aio_clear_cancel_function(struct kaiocb *job)
987 {
988 struct kaioinfo *ki;
989 bool ret;
990
991 ki = job->userproc->p_aioinfo;
992 AIO_LOCK(ki);
993 ret = aio_clear_cancel_function_locked(job);
994 AIO_UNLOCK(ki);
995 return (ret);
996 }
997
998 static bool
aio_set_cancel_function_locked(struct kaiocb * job,aio_cancel_fn_t * func)999 aio_set_cancel_function_locked(struct kaiocb *job, aio_cancel_fn_t *func)
1000 {
1001
1002 AIO_LOCK_ASSERT(job->userproc->p_aioinfo, MA_OWNED);
1003 if (job->jobflags & KAIOCB_CANCELLED)
1004 return (false);
1005 job->cancel_fn = func;
1006 return (true);
1007 }
1008
1009 bool
aio_set_cancel_function(struct kaiocb * job,aio_cancel_fn_t * func)1010 aio_set_cancel_function(struct kaiocb *job, aio_cancel_fn_t *func)
1011 {
1012 struct kaioinfo *ki;
1013 bool ret;
1014
1015 ki = job->userproc->p_aioinfo;
1016 AIO_LOCK(ki);
1017 ret = aio_set_cancel_function_locked(job, func);
1018 AIO_UNLOCK(ki);
1019 return (ret);
1020 }
1021
1022 void
aio_complete(struct kaiocb * job,long status,int error)1023 aio_complete(struct kaiocb *job, long status, int error)
1024 {
1025 struct kaioinfo *ki;
1026 struct proc *userp;
1027
1028 job->uaiocb._aiocb_private.error = error;
1029 job->uaiocb._aiocb_private.status = status;
1030
1031 userp = job->userproc;
1032 ki = userp->p_aioinfo;
1033
1034 AIO_LOCK(ki);
1035 KASSERT(!(job->jobflags & KAIOCB_FINISHED),
1036 ("duplicate aio_complete"));
1037 job->jobflags |= KAIOCB_FINISHED;
1038 if ((job->jobflags & (KAIOCB_QUEUEING | KAIOCB_CANCELLING)) == 0) {
1039 TAILQ_REMOVE(&ki->kaio_jobqueue, job, plist);
1040 aio_bio_done_notify(userp, job);
1041 }
1042 AIO_UNLOCK(ki);
1043 }
1044
1045 void
aio_cancel(struct kaiocb * job)1046 aio_cancel(struct kaiocb *job)
1047 {
1048
1049 aio_complete(job, -1, ECANCELED);
1050 }
1051
1052 void
aio_switch_vmspace(struct kaiocb * job)1053 aio_switch_vmspace(struct kaiocb *job)
1054 {
1055
1056 vmspace_switch_aio(job->userproc->p_vmspace);
1057 }
1058
1059 /*
1060 * The AIO daemon, most of the actual work is done in aio_process_*,
1061 * but the setup (and address space mgmt) is done in this routine.
1062 */
1063 static void
aio_daemon(void * _id)1064 aio_daemon(void *_id)
1065 {
1066 struct kaiocb *job;
1067 struct aioproc *aiop;
1068 struct kaioinfo *ki;
1069 struct proc *p;
1070 struct vmspace *myvm;
1071 struct thread *td = curthread;
1072 int id = (intptr_t)_id;
1073
1074 /*
1075 * Grab an extra reference on the daemon's vmspace so that it
1076 * doesn't get freed by jobs that switch to a different
1077 * vmspace.
1078 */
1079 p = td->td_proc;
1080 myvm = vmspace_acquire_ref(p);
1081
1082 KASSERT(p->p_textvp == NULL, ("kthread has a textvp"));
1083
1084 /*
1085 * Allocate and ready the aio control info. There is one aiop structure
1086 * per daemon.
1087 */
1088 aiop = malloc(sizeof(*aiop), M_AIO, M_WAITOK);
1089 aiop->aioproc = p;
1090 aiop->aioprocflags = 0;
1091
1092 /*
1093 * Wakeup parent process. (Parent sleeps to keep from blasting away
1094 * and creating too many daemons.)
1095 */
1096 sema_post(&aio_newproc_sem);
1097
1098 mtx_lock(&aio_job_mtx);
1099 for (;;) {
1100 /*
1101 * Take daemon off of free queue
1102 */
1103 if (aiop->aioprocflags & AIOP_FREE) {
1104 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1105 aiop->aioprocflags &= ~AIOP_FREE;
1106 }
1107
1108 /*
1109 * Check for jobs.
1110 */
1111 while ((job = aio_selectjob(aiop)) != NULL) {
1112 mtx_unlock(&aio_job_mtx);
1113
1114 ki = job->userproc->p_aioinfo;
1115 job->handle_fn(job);
1116
1117 mtx_lock(&aio_job_mtx);
1118 /* Decrement the active job count. */
1119 ki->kaio_active_count--;
1120 }
1121
1122 /*
1123 * Disconnect from user address space.
1124 */
1125 if (p->p_vmspace != myvm) {
1126 mtx_unlock(&aio_job_mtx);
1127 vmspace_switch_aio(myvm);
1128 mtx_lock(&aio_job_mtx);
1129 /*
1130 * We have to restart to avoid race, we only sleep if
1131 * no job can be selected.
1132 */
1133 continue;
1134 }
1135
1136 mtx_assert(&aio_job_mtx, MA_OWNED);
1137
1138 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
1139 aiop->aioprocflags |= AIOP_FREE;
1140
1141 /*
1142 * If daemon is inactive for a long time, allow it to exit,
1143 * thereby freeing resources.
1144 */
1145 if (msleep(p, &aio_job_mtx, PRIBIO, "aiordy",
1146 aiod_lifetime) == EWOULDBLOCK && TAILQ_EMPTY(&aio_jobs) &&
1147 (aiop->aioprocflags & AIOP_FREE) &&
1148 num_aio_procs > target_aio_procs)
1149 break;
1150 }
1151 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1152 num_aio_procs--;
1153 mtx_unlock(&aio_job_mtx);
1154 free(aiop, M_AIO);
1155 free_unr(aiod_unr, id);
1156 vmspace_free(myvm);
1157
1158 KASSERT(p->p_vmspace == myvm,
1159 ("AIOD: bad vmspace for exiting daemon"));
1160 KASSERT(refcount_load(&myvm->vm_refcnt) > 1,
1161 ("AIOD: bad vm refcnt for exiting daemon: %d",
1162 refcount_load(&myvm->vm_refcnt)));
1163 kproc_exit(0);
1164 }
1165
1166 /*
1167 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
1168 * AIO daemon modifies its environment itself.
1169 */
1170 static int
aio_newproc(int * start)1171 aio_newproc(int *start)
1172 {
1173 int error;
1174 struct proc *p;
1175 int id;
1176
1177 id = alloc_unr(aiod_unr);
1178 error = kproc_create(aio_daemon, (void *)(intptr_t)id, &p,
1179 RFNOWAIT, 0, "aiod%d", id);
1180 if (error == 0) {
1181 /*
1182 * Wait until daemon is started.
1183 */
1184 sema_wait(&aio_newproc_sem);
1185 mtx_lock(&aio_job_mtx);
1186 num_aio_procs++;
1187 if (start != NULL)
1188 (*start)--;
1189 mtx_unlock(&aio_job_mtx);
1190 } else {
1191 free_unr(aiod_unr, id);
1192 }
1193 return (error);
1194 }
1195
1196 /*
1197 * Try the high-performance, low-overhead bio method for eligible
1198 * VCHR devices. This method doesn't use an aio helper thread, and
1199 * thus has very low overhead.
1200 *
1201 * Assumes that the caller, aio_aqueue(), has incremented the file
1202 * structure's reference count, preventing its deallocation for the
1203 * duration of this call.
1204 */
1205 static int
aio_qbio(struct proc * p,struct kaiocb * job)1206 aio_qbio(struct proc *p, struct kaiocb *job)
1207 {
1208 struct aiocb *cb;
1209 struct file *fp;
1210 struct buf *pbuf;
1211 struct vnode *vp;
1212 struct cdevsw *csw;
1213 struct cdev *dev;
1214 struct kaioinfo *ki;
1215 struct bio **bios = NULL;
1216 off_t offset;
1217 int bio_cmd, error, i, iovcnt, opcode, poff, ref;
1218 vm_prot_t prot;
1219 bool use_unmapped;
1220
1221 cb = &job->uaiocb;
1222 fp = job->fd_file;
1223 opcode = cb->aio_lio_opcode;
1224
1225 if (!(opcode == LIO_WRITE || opcode == LIO_WRITEV ||
1226 opcode == LIO_READ || opcode == LIO_READV))
1227 return (-1);
1228 if (fp == NULL || fp->f_type != DTYPE_VNODE)
1229 return (-1);
1230
1231 vp = fp->f_vnode;
1232 if (vp->v_type != VCHR)
1233 return (-1);
1234 if (vp->v_bufobj.bo_bsize == 0)
1235 return (-1);
1236
1237 bio_cmd = (opcode & LIO_WRITE) ? BIO_WRITE : BIO_READ;
1238 iovcnt = job->uiop->uio_iovcnt;
1239 if (iovcnt > max_buf_aio)
1240 return (-1);
1241 for (i = 0; i < iovcnt; i++) {
1242 if (job->uiop->uio_iov[i].iov_len % vp->v_bufobj.bo_bsize != 0)
1243 return (-1);
1244 if (job->uiop->uio_iov[i].iov_len > maxphys) {
1245 error = -1;
1246 return (-1);
1247 }
1248 }
1249 offset = cb->aio_offset;
1250
1251 ref = 0;
1252 csw = devvn_refthread(vp, &dev, &ref);
1253 if (csw == NULL)
1254 return (ENXIO);
1255
1256 if ((csw->d_flags & D_DISK) == 0) {
1257 error = -1;
1258 goto unref;
1259 }
1260 if (job->uiop->uio_resid > dev->si_iosize_max) {
1261 error = -1;
1262 goto unref;
1263 }
1264
1265 ki = p->p_aioinfo;
1266 job->error = 0;
1267
1268 use_unmapped = (dev->si_flags & SI_UNMAPPED) && unmapped_buf_allowed;
1269 if (!use_unmapped) {
1270 AIO_LOCK(ki);
1271 if (ki->kaio_buffer_count + iovcnt > max_buf_aio) {
1272 AIO_UNLOCK(ki);
1273 error = EAGAIN;
1274 goto unref;
1275 }
1276 ki->kaio_buffer_count += iovcnt;
1277 AIO_UNLOCK(ki);
1278 }
1279
1280 bios = malloc(sizeof(struct bio *) * iovcnt, M_TEMP, M_WAITOK);
1281 refcount_init(&job->nbio, iovcnt);
1282 for (i = 0; i < iovcnt; i++) {
1283 struct vm_page** pages;
1284 struct bio *bp;
1285 void *buf;
1286 size_t nbytes;
1287 int npages;
1288
1289 buf = job->uiop->uio_iov[i].iov_base;
1290 nbytes = job->uiop->uio_iov[i].iov_len;
1291
1292 bios[i] = g_alloc_bio();
1293 bp = bios[i];
1294
1295 poff = (vm_offset_t)buf & PAGE_MASK;
1296 if (use_unmapped) {
1297 pbuf = NULL;
1298 pages = malloc(sizeof(vm_page_t) * (atop(round_page(
1299 nbytes)) + 1), M_TEMP, M_WAITOK | M_ZERO);
1300 } else {
1301 pbuf = uma_zalloc(pbuf_zone, M_WAITOK);
1302 BUF_KERNPROC(pbuf);
1303 pages = pbuf->b_pages;
1304 }
1305
1306 bp->bio_length = nbytes;
1307 bp->bio_bcount = nbytes;
1308 bp->bio_done = aio_biowakeup;
1309 bp->bio_offset = offset;
1310 bp->bio_cmd = bio_cmd;
1311 bp->bio_dev = dev;
1312 bp->bio_caller1 = job;
1313 bp->bio_caller2 = pbuf;
1314
1315 prot = VM_PROT_READ;
1316 if (opcode == LIO_READ || opcode == LIO_READV)
1317 prot |= VM_PROT_WRITE; /* Less backwards than it looks */
1318 npages = vm_fault_quick_hold_pages(&curproc->p_vmspace->vm_map,
1319 (vm_offset_t)buf, bp->bio_length, prot, pages,
1320 atop(maxphys) + 1);
1321 if (npages < 0) {
1322 if (pbuf != NULL)
1323 uma_zfree(pbuf_zone, pbuf);
1324 else
1325 free(pages, M_TEMP);
1326 error = EFAULT;
1327 g_destroy_bio(bp);
1328 i--;
1329 goto destroy_bios;
1330 }
1331 if (pbuf != NULL) {
1332 pmap_qenter((vm_offset_t)pbuf->b_data, pages, npages);
1333 bp->bio_data = pbuf->b_data + poff;
1334 pbuf->b_npages = npages;
1335 atomic_add_int(&num_buf_aio, 1);
1336 } else {
1337 bp->bio_ma = pages;
1338 bp->bio_ma_n = npages;
1339 bp->bio_ma_offset = poff;
1340 bp->bio_data = unmapped_buf;
1341 bp->bio_flags |= BIO_UNMAPPED;
1342 atomic_add_int(&num_unmapped_aio, 1);
1343 }
1344
1345 offset += nbytes;
1346 }
1347
1348 /* Perform transfer. */
1349 for (i = 0; i < iovcnt; i++)
1350 csw->d_strategy(bios[i]);
1351 free(bios, M_TEMP);
1352
1353 dev_relthread(dev, ref);
1354 return (0);
1355
1356 destroy_bios:
1357 for (; i >= 0; i--)
1358 aio_biocleanup(bios[i]);
1359 free(bios, M_TEMP);
1360 unref:
1361 dev_relthread(dev, ref);
1362 return (error);
1363 }
1364
1365 #ifdef COMPAT_FREEBSD6
1366 static int
convert_old_sigevent(struct osigevent * osig,struct sigevent * nsig)1367 convert_old_sigevent(struct osigevent *osig, struct sigevent *nsig)
1368 {
1369
1370 /*
1371 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are
1372 * supported by AIO with the old sigevent structure.
1373 */
1374 nsig->sigev_notify = osig->sigev_notify;
1375 switch (nsig->sigev_notify) {
1376 case SIGEV_NONE:
1377 break;
1378 case SIGEV_SIGNAL:
1379 nsig->sigev_signo = osig->__sigev_u.__sigev_signo;
1380 break;
1381 case SIGEV_KEVENT:
1382 nsig->sigev_notify_kqueue =
1383 osig->__sigev_u.__sigev_notify_kqueue;
1384 nsig->sigev_value.sival_ptr = osig->sigev_value.sival_ptr;
1385 break;
1386 default:
1387 return (EINVAL);
1388 }
1389 return (0);
1390 }
1391
1392 static int
aiocb_copyin_old_sigevent(struct aiocb * ujob,struct kaiocb * kjob,int type __unused)1393 aiocb_copyin_old_sigevent(struct aiocb *ujob, struct kaiocb *kjob,
1394 int type __unused)
1395 {
1396 struct oaiocb *ojob;
1397 struct aiocb *kcb = &kjob->uaiocb;
1398 int error;
1399
1400 bzero(kcb, sizeof(struct aiocb));
1401 error = copyin(ujob, kcb, sizeof(struct oaiocb));
1402 if (error)
1403 return (error);
1404 /* No need to copyin aio_iov, because it did not exist in FreeBSD 6 */
1405 ojob = (struct oaiocb *)kcb;
1406 return (convert_old_sigevent(&ojob->aio_sigevent, &kcb->aio_sigevent));
1407 }
1408 #endif
1409
1410 static int
aiocb_copyin(struct aiocb * ujob,struct kaiocb * kjob,int type)1411 aiocb_copyin(struct aiocb *ujob, struct kaiocb *kjob, int type)
1412 {
1413 struct aiocb *kcb = &kjob->uaiocb;
1414 int error;
1415
1416 error = copyin(ujob, kcb, sizeof(struct aiocb));
1417 if (error)
1418 return (error);
1419 if (type == LIO_NOP)
1420 type = kcb->aio_lio_opcode;
1421 if (type & LIO_VECTORED) {
1422 /* malloc a uio and copy in the iovec */
1423 error = copyinuio(__DEVOLATILE(struct iovec*, kcb->aio_iov),
1424 kcb->aio_iovcnt, &kjob->uiop);
1425 }
1426
1427 return (error);
1428 }
1429
1430 static long
aiocb_fetch_status(struct aiocb * ujob)1431 aiocb_fetch_status(struct aiocb *ujob)
1432 {
1433
1434 return (fuword(&ujob->_aiocb_private.status));
1435 }
1436
1437 static long
aiocb_fetch_error(struct aiocb * ujob)1438 aiocb_fetch_error(struct aiocb *ujob)
1439 {
1440
1441 return (fuword(&ujob->_aiocb_private.error));
1442 }
1443
1444 static int
aiocb_store_status(struct aiocb * ujob,long status)1445 aiocb_store_status(struct aiocb *ujob, long status)
1446 {
1447
1448 return (suword(&ujob->_aiocb_private.status, status));
1449 }
1450
1451 static int
aiocb_store_error(struct aiocb * ujob,long error)1452 aiocb_store_error(struct aiocb *ujob, long error)
1453 {
1454
1455 return (suword(&ujob->_aiocb_private.error, error));
1456 }
1457
1458 static int
aiocb_store_kernelinfo(struct aiocb * ujob,long jobref)1459 aiocb_store_kernelinfo(struct aiocb *ujob, long jobref)
1460 {
1461
1462 return (suword(&ujob->_aiocb_private.kernelinfo, jobref));
1463 }
1464
1465 static int
aiocb_store_aiocb(struct aiocb ** ujobp,struct aiocb * ujob)1466 aiocb_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob)
1467 {
1468
1469 return (suword(ujobp, (long)ujob));
1470 }
1471
1472 static struct aiocb_ops aiocb_ops = {
1473 .aio_copyin = aiocb_copyin,
1474 .fetch_status = aiocb_fetch_status,
1475 .fetch_error = aiocb_fetch_error,
1476 .store_status = aiocb_store_status,
1477 .store_error = aiocb_store_error,
1478 .store_kernelinfo = aiocb_store_kernelinfo,
1479 .store_aiocb = aiocb_store_aiocb,
1480 };
1481
1482 #ifdef COMPAT_FREEBSD6
1483 static struct aiocb_ops aiocb_ops_osigevent = {
1484 .aio_copyin = aiocb_copyin_old_sigevent,
1485 .fetch_status = aiocb_fetch_status,
1486 .fetch_error = aiocb_fetch_error,
1487 .store_status = aiocb_store_status,
1488 .store_error = aiocb_store_error,
1489 .store_kernelinfo = aiocb_store_kernelinfo,
1490 .store_aiocb = aiocb_store_aiocb,
1491 };
1492 #endif
1493
1494 /*
1495 * Queue a new AIO request. Choosing either the threaded or direct bio VCHR
1496 * technique is done in this code.
1497 */
1498 int
aio_aqueue(struct thread * td,struct aiocb * ujob,struct aioliojob * lj,int type,struct aiocb_ops * ops)1499 aio_aqueue(struct thread *td, struct aiocb *ujob, struct aioliojob *lj,
1500 int type, struct aiocb_ops *ops)
1501 {
1502 struct proc *p = td->td_proc;
1503 struct file *fp = NULL;
1504 struct kaiocb *job;
1505 struct kaioinfo *ki;
1506 struct kevent kev;
1507 int opcode;
1508 int error;
1509 int fd, kqfd;
1510 int jid;
1511 u_short evflags;
1512
1513 if (p->p_aioinfo == NULL)
1514 aio_init_aioinfo(p);
1515
1516 ki = p->p_aioinfo;
1517
1518 ops->store_status(ujob, -1);
1519 ops->store_error(ujob, 0);
1520 ops->store_kernelinfo(ujob, -1);
1521
1522 if (num_queue_count >= max_queue_count ||
1523 ki->kaio_count >= max_aio_queue_per_proc) {
1524 error = EAGAIN;
1525 goto err1;
1526 }
1527
1528 job = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO);
1529 knlist_init_mtx(&job->klist, AIO_MTX(ki));
1530
1531 error = ops->aio_copyin(ujob, job, type);
1532 if (error)
1533 goto err2;
1534
1535 if (job->uaiocb.aio_nbytes > IOSIZE_MAX) {
1536 error = EINVAL;
1537 goto err2;
1538 }
1539
1540 if (job->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT &&
1541 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL &&
1542 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID &&
1543 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) {
1544 error = EINVAL;
1545 goto err2;
1546 }
1547
1548 if ((job->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
1549 job->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) &&
1550 !_SIG_VALID(job->uaiocb.aio_sigevent.sigev_signo)) {
1551 error = EINVAL;
1552 goto err2;
1553 }
1554
1555 /* Get the opcode. */
1556 if (type == LIO_NOP) {
1557 switch (job->uaiocb.aio_lio_opcode & ~LIO_FOFFSET) {
1558 case LIO_WRITE:
1559 case LIO_WRITEV:
1560 case LIO_NOP:
1561 case LIO_READ:
1562 case LIO_READV:
1563 opcode = job->uaiocb.aio_lio_opcode & ~LIO_FOFFSET;
1564 if ((job->uaiocb.aio_lio_opcode & LIO_FOFFSET) != 0)
1565 job->ioflags |= KAIOCB_IO_FOFFSET;
1566 break;
1567 default:
1568 error = EINVAL;
1569 goto err2;
1570 }
1571 } else
1572 opcode = job->uaiocb.aio_lio_opcode = type;
1573
1574 ksiginfo_init(&job->ksi);
1575
1576 /* Save userspace address of the job info. */
1577 job->ujob = ujob;
1578
1579 /*
1580 * Validate the opcode and fetch the file object for the specified
1581 * file descriptor.
1582 *
1583 * XXXRW: Moved the opcode validation up here so that we don't
1584 * retrieve a file descriptor without knowing what the capabiltity
1585 * should be.
1586 */
1587 fd = job->uaiocb.aio_fildes;
1588 switch (opcode) {
1589 case LIO_WRITE:
1590 case LIO_WRITEV:
1591 error = fget_write(td, fd, &cap_pwrite_rights, &fp);
1592 break;
1593 case LIO_READ:
1594 case LIO_READV:
1595 error = fget_read(td, fd, &cap_pread_rights, &fp);
1596 break;
1597 case LIO_SYNC:
1598 case LIO_DSYNC:
1599 error = fget(td, fd, &cap_fsync_rights, &fp);
1600 break;
1601 case LIO_MLOCK:
1602 break;
1603 case LIO_NOP:
1604 error = fget(td, fd, &cap_no_rights, &fp);
1605 break;
1606 default:
1607 error = EINVAL;
1608 }
1609 if (error)
1610 goto err3;
1611
1612 if ((opcode & LIO_SYNC) && fp->f_vnode == NULL) {
1613 error = EINVAL;
1614 goto err3;
1615 }
1616
1617 if ((opcode == LIO_READ || opcode == LIO_READV ||
1618 opcode == LIO_WRITE || opcode == LIO_WRITEV) &&
1619 job->uaiocb.aio_offset < 0 &&
1620 (fp->f_vnode == NULL || fp->f_vnode->v_type != VCHR)) {
1621 error = EINVAL;
1622 goto err3;
1623 }
1624
1625 if (fp != NULL && fp->f_ops == &path_fileops) {
1626 error = EBADF;
1627 goto err3;
1628 }
1629
1630 job->fd_file = fp;
1631
1632 mtx_lock(&aio_job_mtx);
1633 jid = jobrefid++;
1634 job->seqno = jobseqno++;
1635 mtx_unlock(&aio_job_mtx);
1636 error = ops->store_kernelinfo(ujob, jid);
1637 if (error) {
1638 error = EINVAL;
1639 goto err3;
1640 }
1641 job->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid;
1642
1643 if (opcode == LIO_NOP) {
1644 fdrop(fp, td);
1645 MPASS(job->uiop == &job->uio || job->uiop == NULL);
1646 uma_zfree(aiocb_zone, job);
1647 return (0);
1648 }
1649
1650 if (job->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT)
1651 goto no_kqueue;
1652 evflags = job->uaiocb.aio_sigevent.sigev_notify_kevent_flags;
1653 if ((evflags & ~(EV_CLEAR | EV_DISPATCH | EV_ONESHOT)) != 0) {
1654 error = EINVAL;
1655 goto err3;
1656 }
1657 kqfd = job->uaiocb.aio_sigevent.sigev_notify_kqueue;
1658 memset(&kev, 0, sizeof(kev));
1659 kev.ident = (uintptr_t)job->ujob;
1660 kev.filter = EVFILT_AIO;
1661 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1 | evflags;
1662 kev.data = (intptr_t)job;
1663 kev.udata = job->uaiocb.aio_sigevent.sigev_value.sival_ptr;
1664 error = kqfd_register(kqfd, &kev, td, M_WAITOK);
1665 if (error)
1666 goto err3;
1667
1668 no_kqueue:
1669
1670 ops->store_error(ujob, EINPROGRESS);
1671 job->uaiocb._aiocb_private.error = EINPROGRESS;
1672 job->userproc = p;
1673 job->cred = crhold(td->td_ucred);
1674 job->jobflags = KAIOCB_QUEUEING;
1675 job->lio = lj;
1676
1677 if (opcode & LIO_VECTORED) {
1678 /* Use the uio copied in by aio_copyin */
1679 MPASS(job->uiop != &job->uio && job->uiop != NULL);
1680 } else {
1681 /* Setup the inline uio */
1682 job->iov[0].iov_base = (void *)(uintptr_t)job->uaiocb.aio_buf;
1683 job->iov[0].iov_len = job->uaiocb.aio_nbytes;
1684 job->uio.uio_iov = job->iov;
1685 job->uio.uio_iovcnt = 1;
1686 job->uio.uio_resid = job->uaiocb.aio_nbytes;
1687 job->uio.uio_segflg = UIO_USERSPACE;
1688 job->uiop = &job->uio;
1689 }
1690 switch (opcode & (LIO_READ | LIO_WRITE)) {
1691 case LIO_READ:
1692 job->uiop->uio_rw = UIO_READ;
1693 break;
1694 case LIO_WRITE:
1695 job->uiop->uio_rw = UIO_WRITE;
1696 break;
1697 }
1698 job->uiop->uio_offset = job->uaiocb.aio_offset;
1699 job->uiop->uio_td = td;
1700
1701 if (opcode == LIO_MLOCK) {
1702 aio_schedule(job, aio_process_mlock);
1703 error = 0;
1704 } else if (fp->f_ops->fo_aio_queue == NULL)
1705 error = aio_queue_file(fp, job);
1706 else
1707 error = fo_aio_queue(fp, job);
1708 if (error)
1709 goto err4;
1710
1711 AIO_LOCK(ki);
1712 job->jobflags &= ~KAIOCB_QUEUEING;
1713 TAILQ_INSERT_TAIL(&ki->kaio_all, job, allist);
1714 ki->kaio_count++;
1715 if (lj)
1716 lj->lioj_count++;
1717 atomic_add_int(&num_queue_count, 1);
1718 if (job->jobflags & KAIOCB_FINISHED) {
1719 /*
1720 * The queue callback completed the request synchronously.
1721 * The bulk of the completion is deferred in that case
1722 * until this point.
1723 */
1724 aio_bio_done_notify(p, job);
1725 } else
1726 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, job, plist);
1727 AIO_UNLOCK(ki);
1728 return (0);
1729
1730 err4:
1731 crfree(job->cred);
1732 err3:
1733 if (fp)
1734 fdrop(fp, td);
1735 knlist_delete(&job->klist, curthread, 0);
1736 err2:
1737 if (job->uiop != &job->uio)
1738 freeuio(job->uiop);
1739 uma_zfree(aiocb_zone, job);
1740 err1:
1741 ops->store_error(ujob, error);
1742 return (error);
1743 }
1744
1745 static void
aio_cancel_daemon_job(struct kaiocb * job)1746 aio_cancel_daemon_job(struct kaiocb *job)
1747 {
1748
1749 mtx_lock(&aio_job_mtx);
1750 if (!aio_cancel_cleared(job))
1751 TAILQ_REMOVE(&aio_jobs, job, list);
1752 mtx_unlock(&aio_job_mtx);
1753 aio_cancel(job);
1754 }
1755
1756 void
aio_schedule(struct kaiocb * job,aio_handle_fn_t * func)1757 aio_schedule(struct kaiocb *job, aio_handle_fn_t *func)
1758 {
1759
1760 mtx_lock(&aio_job_mtx);
1761 if (!aio_set_cancel_function(job, aio_cancel_daemon_job)) {
1762 mtx_unlock(&aio_job_mtx);
1763 aio_cancel(job);
1764 return;
1765 }
1766 job->handle_fn = func;
1767 TAILQ_INSERT_TAIL(&aio_jobs, job, list);
1768 aio_kick_nowait(job->userproc);
1769 mtx_unlock(&aio_job_mtx);
1770 }
1771
1772 static void
aio_cancel_sync(struct kaiocb * job)1773 aio_cancel_sync(struct kaiocb *job)
1774 {
1775 struct kaioinfo *ki;
1776
1777 ki = job->userproc->p_aioinfo;
1778 AIO_LOCK(ki);
1779 if (!aio_cancel_cleared(job))
1780 TAILQ_REMOVE(&ki->kaio_syncqueue, job, list);
1781 AIO_UNLOCK(ki);
1782 aio_cancel(job);
1783 }
1784
1785 int
aio_queue_file(struct file * fp,struct kaiocb * job)1786 aio_queue_file(struct file *fp, struct kaiocb *job)
1787 {
1788 struct kaioinfo *ki;
1789 struct kaiocb *job2;
1790 struct vnode *vp;
1791 struct mount *mp;
1792 int error;
1793 bool safe;
1794
1795 ki = job->userproc->p_aioinfo;
1796 error = aio_qbio(job->userproc, job);
1797 if (error >= 0)
1798 return (error);
1799 safe = false;
1800 if (fp->f_type == DTYPE_VNODE) {
1801 vp = fp->f_vnode;
1802 if (vp->v_type == VREG || vp->v_type == VDIR) {
1803 mp = fp->f_vnode->v_mount;
1804 if (mp == NULL || (mp->mnt_flag & MNT_LOCAL) != 0)
1805 safe = true;
1806 }
1807 }
1808 if (!(safe || enable_aio_unsafe)) {
1809 counted_warning(&unsafe_warningcnt,
1810 "is attempting to use unsafe AIO requests");
1811 return (EOPNOTSUPP);
1812 }
1813
1814 if (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) {
1815 aio_schedule(job, aio_process_rw);
1816 error = 0;
1817 } else if (job->uaiocb.aio_lio_opcode & LIO_SYNC) {
1818 AIO_LOCK(ki);
1819 TAILQ_FOREACH(job2, &ki->kaio_jobqueue, plist) {
1820 if (job2->fd_file == job->fd_file &&
1821 ((job2->uaiocb.aio_lio_opcode & LIO_SYNC) == 0) &&
1822 job2->seqno < job->seqno) {
1823 job2->jobflags |= KAIOCB_CHECKSYNC;
1824 job->pending++;
1825 }
1826 }
1827 if (job->pending != 0) {
1828 if (!aio_set_cancel_function_locked(job,
1829 aio_cancel_sync)) {
1830 AIO_UNLOCK(ki);
1831 aio_cancel(job);
1832 return (0);
1833 }
1834 TAILQ_INSERT_TAIL(&ki->kaio_syncqueue, job, list);
1835 AIO_UNLOCK(ki);
1836 return (0);
1837 }
1838 AIO_UNLOCK(ki);
1839 aio_schedule(job, aio_process_sync);
1840 error = 0;
1841 } else {
1842 error = EINVAL;
1843 }
1844 return (error);
1845 }
1846
1847 static void
aio_kick_nowait(struct proc * userp)1848 aio_kick_nowait(struct proc *userp)
1849 {
1850 struct kaioinfo *ki = userp->p_aioinfo;
1851 struct aioproc *aiop;
1852
1853 mtx_assert(&aio_job_mtx, MA_OWNED);
1854 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1855 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1856 aiop->aioprocflags &= ~AIOP_FREE;
1857 wakeup(aiop->aioproc);
1858 } else if (num_aio_resv_start + num_aio_procs < max_aio_procs &&
1859 ki->kaio_active_count + num_aio_resv_start < max_aio_per_proc) {
1860 taskqueue_enqueue(taskqueue_aiod_kick, &ki->kaio_task);
1861 }
1862 }
1863
1864 static int
aio_kick(struct proc * userp)1865 aio_kick(struct proc *userp)
1866 {
1867 struct kaioinfo *ki = userp->p_aioinfo;
1868 struct aioproc *aiop;
1869 int error, ret = 0;
1870
1871 mtx_assert(&aio_job_mtx, MA_OWNED);
1872 retryproc:
1873 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1874 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1875 aiop->aioprocflags &= ~AIOP_FREE;
1876 wakeup(aiop->aioproc);
1877 } else if (num_aio_resv_start + num_aio_procs < max_aio_procs &&
1878 ki->kaio_active_count + num_aio_resv_start < max_aio_per_proc) {
1879 num_aio_resv_start++;
1880 mtx_unlock(&aio_job_mtx);
1881 error = aio_newproc(&num_aio_resv_start);
1882 mtx_lock(&aio_job_mtx);
1883 if (error) {
1884 num_aio_resv_start--;
1885 goto retryproc;
1886 }
1887 } else {
1888 ret = -1;
1889 }
1890 return (ret);
1891 }
1892
1893 static void
aio_kick_helper(void * context,int pending)1894 aio_kick_helper(void *context, int pending)
1895 {
1896 struct proc *userp = context;
1897
1898 mtx_lock(&aio_job_mtx);
1899 while (--pending >= 0) {
1900 if (aio_kick(userp))
1901 break;
1902 }
1903 mtx_unlock(&aio_job_mtx);
1904 }
1905
1906 /*
1907 * Support the aio_return system call, as a side-effect, kernel resources are
1908 * released.
1909 */
1910 static int
kern_aio_return(struct thread * td,struct aiocb * ujob,struct aiocb_ops * ops)1911 kern_aio_return(struct thread *td, struct aiocb *ujob, struct aiocb_ops *ops)
1912 {
1913 struct proc *p = td->td_proc;
1914 struct kaiocb *job;
1915 struct kaioinfo *ki;
1916 long status, error;
1917
1918 ki = p->p_aioinfo;
1919 if (ki == NULL)
1920 return (EINVAL);
1921 AIO_LOCK(ki);
1922 TAILQ_FOREACH(job, &ki->kaio_done, plist) {
1923 if (job->ujob == ujob)
1924 break;
1925 }
1926 if (job != NULL) {
1927 MPASS(job->jobflags & KAIOCB_FINISHED);
1928 status = job->uaiocb._aiocb_private.status;
1929 error = job->uaiocb._aiocb_private.error;
1930 td->td_retval[0] = status;
1931 td->td_ru.ru_oublock += job->outblock;
1932 td->td_ru.ru_inblock += job->inblock;
1933 td->td_ru.ru_msgsnd += job->msgsnd;
1934 td->td_ru.ru_msgrcv += job->msgrcv;
1935 aio_free_entry(job);
1936 AIO_UNLOCK(ki);
1937 ops->store_error(ujob, error);
1938 ops->store_status(ujob, status);
1939 } else {
1940 error = EINVAL;
1941 AIO_UNLOCK(ki);
1942 }
1943 return (error);
1944 }
1945
1946 int
sys_aio_return(struct thread * td,struct aio_return_args * uap)1947 sys_aio_return(struct thread *td, struct aio_return_args *uap)
1948 {
1949
1950 return (kern_aio_return(td, uap->aiocbp, &aiocb_ops));
1951 }
1952
1953 /*
1954 * Allow a process to wakeup when any of the I/O requests are completed.
1955 */
1956 static int
kern_aio_suspend(struct thread * td,int njoblist,struct aiocb ** ujoblist,struct timespec * ts)1957 kern_aio_suspend(struct thread *td, int njoblist, struct aiocb **ujoblist,
1958 struct timespec *ts)
1959 {
1960 struct proc *p = td->td_proc;
1961 struct timeval atv;
1962 struct kaioinfo *ki;
1963 struct kaiocb *firstjob, *job;
1964 int error, i, timo;
1965
1966 timo = 0;
1967 if (ts) {
1968 if (ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
1969 return (EINVAL);
1970
1971 TIMESPEC_TO_TIMEVAL(&atv, ts);
1972 if (itimerfix(&atv))
1973 return (EINVAL);
1974 timo = tvtohz(&atv);
1975 }
1976
1977 ki = p->p_aioinfo;
1978 if (ki == NULL)
1979 return (EAGAIN);
1980
1981 if (njoblist == 0)
1982 return (0);
1983
1984 AIO_LOCK(ki);
1985 for (;;) {
1986 firstjob = NULL;
1987 error = 0;
1988 TAILQ_FOREACH(job, &ki->kaio_all, allist) {
1989 for (i = 0; i < njoblist; i++) {
1990 if (job->ujob == ujoblist[i]) {
1991 if (firstjob == NULL)
1992 firstjob = job;
1993 if (job->jobflags & KAIOCB_FINISHED)
1994 goto RETURN;
1995 }
1996 }
1997 }
1998 /* All tasks were finished. */
1999 if (firstjob == NULL)
2000 break;
2001
2002 ki->kaio_flags |= KAIO_WAKEUP;
2003 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
2004 "aiospn", timo);
2005 if (error == ERESTART)
2006 error = EINTR;
2007 if (error)
2008 break;
2009 }
2010 RETURN:
2011 AIO_UNLOCK(ki);
2012 return (error);
2013 }
2014
2015 int
sys_aio_suspend(struct thread * td,struct aio_suspend_args * uap)2016 sys_aio_suspend(struct thread *td, struct aio_suspend_args *uap)
2017 {
2018 struct timespec ts, *tsp;
2019 struct aiocb **ujoblist;
2020 int error;
2021
2022 if (uap->nent < 0 || uap->nent > max_aio_queue_per_proc)
2023 return (EINVAL);
2024
2025 if (uap->timeout) {
2026 /* Get timespec struct. */
2027 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
2028 return (error);
2029 tsp = &ts;
2030 } else
2031 tsp = NULL;
2032
2033 ujoblist = malloc(uap->nent * sizeof(ujoblist[0]), M_AIO, M_WAITOK);
2034 error = copyin(uap->aiocbp, ujoblist, uap->nent * sizeof(ujoblist[0]));
2035 if (error == 0)
2036 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp);
2037 free(ujoblist, M_AIO);
2038 return (error);
2039 }
2040
2041 /*
2042 * aio_cancel cancels any non-bio aio operations not currently in progress.
2043 */
2044 int
sys_aio_cancel(struct thread * td,struct aio_cancel_args * uap)2045 sys_aio_cancel(struct thread *td, struct aio_cancel_args *uap)
2046 {
2047 struct proc *p = td->td_proc;
2048 struct kaioinfo *ki;
2049 struct kaiocb *job, *jobn;
2050 struct file *fp;
2051 int error;
2052 int cancelled = 0;
2053 int notcancelled = 0;
2054 struct vnode *vp;
2055
2056 /* Lookup file object. */
2057 error = fget(td, uap->fd, &cap_no_rights, &fp);
2058 if (error)
2059 return (error);
2060
2061 ki = p->p_aioinfo;
2062 if (ki == NULL)
2063 goto done;
2064
2065 if (fp->f_type == DTYPE_VNODE) {
2066 vp = fp->f_vnode;
2067 if (vn_isdisk(vp)) {
2068 fdrop(fp, td);
2069 td->td_retval[0] = AIO_NOTCANCELED;
2070 return (0);
2071 }
2072 }
2073
2074 AIO_LOCK(ki);
2075 TAILQ_FOREACH_SAFE(job, &ki->kaio_jobqueue, plist, jobn) {
2076 if ((uap->fd == job->uaiocb.aio_fildes) &&
2077 ((uap->aiocbp == NULL) ||
2078 (uap->aiocbp == job->ujob))) {
2079 if (aio_cancel_job(p, ki, job)) {
2080 cancelled++;
2081 } else {
2082 notcancelled++;
2083 }
2084 if (uap->aiocbp != NULL)
2085 break;
2086 }
2087 }
2088 AIO_UNLOCK(ki);
2089
2090 done:
2091 fdrop(fp, td);
2092
2093 if (uap->aiocbp != NULL) {
2094 if (cancelled) {
2095 td->td_retval[0] = AIO_CANCELED;
2096 return (0);
2097 }
2098 }
2099
2100 if (notcancelled) {
2101 td->td_retval[0] = AIO_NOTCANCELED;
2102 return (0);
2103 }
2104
2105 if (cancelled) {
2106 td->td_retval[0] = AIO_CANCELED;
2107 return (0);
2108 }
2109
2110 td->td_retval[0] = AIO_ALLDONE;
2111
2112 return (0);
2113 }
2114
2115 /*
2116 * aio_error is implemented in the kernel level for compatibility purposes
2117 * only. For a user mode async implementation, it would be best to do it in
2118 * a userland subroutine.
2119 */
2120 static int
kern_aio_error(struct thread * td,struct aiocb * ujob,struct aiocb_ops * ops)2121 kern_aio_error(struct thread *td, struct aiocb *ujob, struct aiocb_ops *ops)
2122 {
2123 struct proc *p = td->td_proc;
2124 struct kaiocb *job;
2125 struct kaioinfo *ki;
2126 int status;
2127
2128 ki = p->p_aioinfo;
2129 if (ki == NULL) {
2130 td->td_retval[0] = EINVAL;
2131 return (0);
2132 }
2133
2134 AIO_LOCK(ki);
2135 TAILQ_FOREACH(job, &ki->kaio_all, allist) {
2136 if (job->ujob == ujob) {
2137 if (job->jobflags & KAIOCB_FINISHED)
2138 td->td_retval[0] =
2139 job->uaiocb._aiocb_private.error;
2140 else
2141 td->td_retval[0] = EINPROGRESS;
2142 AIO_UNLOCK(ki);
2143 return (0);
2144 }
2145 }
2146 AIO_UNLOCK(ki);
2147
2148 /*
2149 * Hack for failure of aio_aqueue.
2150 */
2151 status = ops->fetch_status(ujob);
2152 if (status == -1) {
2153 td->td_retval[0] = ops->fetch_error(ujob);
2154 return (0);
2155 }
2156
2157 td->td_retval[0] = EINVAL;
2158 return (0);
2159 }
2160
2161 int
sys_aio_error(struct thread * td,struct aio_error_args * uap)2162 sys_aio_error(struct thread *td, struct aio_error_args *uap)
2163 {
2164
2165 return (kern_aio_error(td, uap->aiocbp, &aiocb_ops));
2166 }
2167
2168 /* syscall - asynchronous read from a file (REALTIME) */
2169 #ifdef COMPAT_FREEBSD6
2170 int
freebsd6_aio_read(struct thread * td,struct freebsd6_aio_read_args * uap)2171 freebsd6_aio_read(struct thread *td, struct freebsd6_aio_read_args *uap)
2172 {
2173
2174 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
2175 &aiocb_ops_osigevent));
2176 }
2177 #endif
2178
2179 int
sys_aio_read(struct thread * td,struct aio_read_args * uap)2180 sys_aio_read(struct thread *td, struct aio_read_args *uap)
2181 {
2182
2183 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, &aiocb_ops));
2184 }
2185
2186 int
sys_aio_readv(struct thread * td,struct aio_readv_args * uap)2187 sys_aio_readv(struct thread *td, struct aio_readv_args *uap)
2188 {
2189
2190 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_READV, &aiocb_ops));
2191 }
2192
2193 /* syscall - asynchronous write to a file (REALTIME) */
2194 #ifdef COMPAT_FREEBSD6
2195 int
freebsd6_aio_write(struct thread * td,struct freebsd6_aio_write_args * uap)2196 freebsd6_aio_write(struct thread *td, struct freebsd6_aio_write_args *uap)
2197 {
2198
2199 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
2200 &aiocb_ops_osigevent));
2201 }
2202 #endif
2203
2204 int
sys_aio_write(struct thread * td,struct aio_write_args * uap)2205 sys_aio_write(struct thread *td, struct aio_write_args *uap)
2206 {
2207
2208 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, &aiocb_ops));
2209 }
2210
2211 int
sys_aio_writev(struct thread * td,struct aio_writev_args * uap)2212 sys_aio_writev(struct thread *td, struct aio_writev_args *uap)
2213 {
2214
2215 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITEV, &aiocb_ops));
2216 }
2217
2218 int
sys_aio_mlock(struct thread * td,struct aio_mlock_args * uap)2219 sys_aio_mlock(struct thread *td, struct aio_mlock_args *uap)
2220 {
2221
2222 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_MLOCK, &aiocb_ops));
2223 }
2224
2225 static int
kern_lio_listio(struct thread * td,int mode,struct aiocb * const * uacb_list,struct aiocb ** acb_list,int nent,struct sigevent * sig,struct aiocb_ops * ops)2226 kern_lio_listio(struct thread *td, int mode, struct aiocb * const *uacb_list,
2227 struct aiocb **acb_list, int nent, struct sigevent *sig,
2228 struct aiocb_ops *ops)
2229 {
2230 struct proc *p = td->td_proc;
2231 struct aiocb *job;
2232 struct kaioinfo *ki;
2233 struct aioliojob *lj;
2234 struct kevent kev;
2235 int error;
2236 int nagain, nerror;
2237 int i;
2238
2239 if ((mode != LIO_NOWAIT) && (mode != LIO_WAIT))
2240 return (EINVAL);
2241
2242 if (nent < 0 || nent > max_aio_queue_per_proc)
2243 return (EINVAL);
2244
2245 if (p->p_aioinfo == NULL)
2246 aio_init_aioinfo(p);
2247
2248 ki = p->p_aioinfo;
2249
2250 lj = uma_zalloc(aiolio_zone, M_WAITOK);
2251 lj->lioj_flags = 0;
2252 lj->lioj_count = 0;
2253 lj->lioj_finished_count = 0;
2254 lj->lioj_signal.sigev_notify = SIGEV_NONE;
2255 knlist_init_mtx(&lj->klist, AIO_MTX(ki));
2256 ksiginfo_init(&lj->lioj_ksi);
2257
2258 /*
2259 * Setup signal.
2260 */
2261 if (sig && (mode == LIO_NOWAIT)) {
2262 bcopy(sig, &lj->lioj_signal, sizeof(lj->lioj_signal));
2263 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
2264 /* Assume only new style KEVENT */
2265 memset(&kev, 0, sizeof(kev));
2266 kev.filter = EVFILT_LIO;
2267 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
2268 kev.ident = (uintptr_t)uacb_list; /* something unique */
2269 kev.data = (intptr_t)lj;
2270 /* pass user defined sigval data */
2271 kev.udata = lj->lioj_signal.sigev_value.sival_ptr;
2272 error = kqfd_register(
2273 lj->lioj_signal.sigev_notify_kqueue, &kev, td,
2274 M_WAITOK);
2275 if (error) {
2276 uma_zfree(aiolio_zone, lj);
2277 return (error);
2278 }
2279 } else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) {
2280 ;
2281 } else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
2282 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) {
2283 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
2284 uma_zfree(aiolio_zone, lj);
2285 return EINVAL;
2286 }
2287 lj->lioj_flags |= LIOJ_SIGNAL;
2288 } else {
2289 uma_zfree(aiolio_zone, lj);
2290 return EINVAL;
2291 }
2292 }
2293
2294 AIO_LOCK(ki);
2295 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
2296 /*
2297 * Add extra aiocb count to avoid the lio to be freed
2298 * by other threads doing aio_waitcomplete or aio_return,
2299 * and prevent event from being sent until we have queued
2300 * all tasks.
2301 */
2302 lj->lioj_count = 1;
2303 AIO_UNLOCK(ki);
2304
2305 /*
2306 * Get pointers to the list of I/O requests.
2307 */
2308 nagain = 0;
2309 nerror = 0;
2310 for (i = 0; i < nent; i++) {
2311 job = acb_list[i];
2312 if (job != NULL) {
2313 error = aio_aqueue(td, job, lj, LIO_NOP, ops);
2314 if (error == EAGAIN)
2315 nagain++;
2316 else if (error != 0)
2317 nerror++;
2318 }
2319 }
2320
2321 error = 0;
2322 AIO_LOCK(ki);
2323 if (mode == LIO_WAIT) {
2324 while (lj->lioj_count - 1 != lj->lioj_finished_count) {
2325 ki->kaio_flags |= KAIO_WAKEUP;
2326 error = msleep(&p->p_aioinfo, AIO_MTX(ki),
2327 PRIBIO | PCATCH, "aiospn", 0);
2328 if (error == ERESTART)
2329 error = EINTR;
2330 if (error)
2331 break;
2332 }
2333 } else {
2334 if (lj->lioj_count - 1 == lj->lioj_finished_count) {
2335 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
2336 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
2337 KNOTE_LOCKED(&lj->klist, 1);
2338 }
2339 if ((lj->lioj_flags & (LIOJ_SIGNAL |
2340 LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL &&
2341 (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
2342 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
2343 aio_sendsig(p, &lj->lioj_signal, &lj->lioj_ksi,
2344 lj->lioj_count != 1);
2345 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
2346 }
2347 }
2348 }
2349 lj->lioj_count--;
2350 if (lj->lioj_count == 0) {
2351 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
2352 knlist_delete(&lj->klist, curthread, 1);
2353 PROC_LOCK(p);
2354 sigqueue_take(&lj->lioj_ksi);
2355 PROC_UNLOCK(p);
2356 AIO_UNLOCK(ki);
2357 uma_zfree(aiolio_zone, lj);
2358 } else
2359 AIO_UNLOCK(ki);
2360
2361 if (nerror)
2362 return (EIO);
2363 else if (nagain)
2364 return (EAGAIN);
2365 else
2366 return (error);
2367 }
2368
2369 /* syscall - list directed I/O (REALTIME) */
2370 #ifdef COMPAT_FREEBSD6
2371 int
freebsd6_lio_listio(struct thread * td,struct freebsd6_lio_listio_args * uap)2372 freebsd6_lio_listio(struct thread *td, struct freebsd6_lio_listio_args *uap)
2373 {
2374 struct aiocb **acb_list;
2375 struct sigevent *sigp, sig;
2376 struct osigevent osig;
2377 int error, nent;
2378
2379 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
2380 return (EINVAL);
2381
2382 nent = uap->nent;
2383 if (nent < 0 || nent > max_aio_queue_per_proc)
2384 return (EINVAL);
2385
2386 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2387 error = copyin(uap->sig, &osig, sizeof(osig));
2388 if (error)
2389 return (error);
2390 error = convert_old_sigevent(&osig, &sig);
2391 if (error)
2392 return (error);
2393 sigp = &sig;
2394 } else
2395 sigp = NULL;
2396
2397 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
2398 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0]));
2399 if (error == 0)
2400 error = kern_lio_listio(td, uap->mode,
2401 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
2402 &aiocb_ops_osigevent);
2403 free(acb_list, M_LIO);
2404 return (error);
2405 }
2406 #endif
2407
2408 /* syscall - list directed I/O (REALTIME) */
2409 int
sys_lio_listio(struct thread * td,struct lio_listio_args * uap)2410 sys_lio_listio(struct thread *td, struct lio_listio_args *uap)
2411 {
2412 struct aiocb **acb_list;
2413 struct sigevent *sigp, sig;
2414 int error, nent;
2415
2416 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
2417 return (EINVAL);
2418
2419 nent = uap->nent;
2420 if (nent < 0 || nent > max_aio_queue_per_proc)
2421 return (EINVAL);
2422
2423 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
2424 error = copyin(uap->sig, &sig, sizeof(sig));
2425 if (error)
2426 return (error);
2427 sigp = &sig;
2428 } else
2429 sigp = NULL;
2430
2431 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
2432 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0]));
2433 if (error == 0)
2434 error = kern_lio_listio(td, uap->mode, uap->acb_list, acb_list,
2435 nent, sigp, &aiocb_ops);
2436 free(acb_list, M_LIO);
2437 return (error);
2438 }
2439
2440 static void
aio_biocleanup(struct bio * bp)2441 aio_biocleanup(struct bio *bp)
2442 {
2443 struct kaiocb *job = (struct kaiocb *)bp->bio_caller1;
2444 struct kaioinfo *ki;
2445 struct buf *pbuf = (struct buf *)bp->bio_caller2;
2446
2447 /* Release mapping into kernel space. */
2448 if (pbuf != NULL) {
2449 MPASS(pbuf->b_npages <= atop(maxphys) + 1);
2450 pmap_qremove((vm_offset_t)pbuf->b_data, pbuf->b_npages);
2451 vm_page_unhold_pages(pbuf->b_pages, pbuf->b_npages);
2452 uma_zfree(pbuf_zone, pbuf);
2453 atomic_subtract_int(&num_buf_aio, 1);
2454 ki = job->userproc->p_aioinfo;
2455 AIO_LOCK(ki);
2456 ki->kaio_buffer_count--;
2457 AIO_UNLOCK(ki);
2458 } else {
2459 MPASS(bp->bio_ma_n <= atop(maxphys) + 1);
2460 vm_page_unhold_pages(bp->bio_ma, bp->bio_ma_n);
2461 free(bp->bio_ma, M_TEMP);
2462 atomic_subtract_int(&num_unmapped_aio, 1);
2463 }
2464 g_destroy_bio(bp);
2465 }
2466
2467 static void
aio_biowakeup(struct bio * bp)2468 aio_biowakeup(struct bio *bp)
2469 {
2470 struct kaiocb *job = (struct kaiocb *)bp->bio_caller1;
2471 size_t nbytes;
2472 long bcount = bp->bio_bcount;
2473 long resid = bp->bio_resid;
2474 int opcode, nblks;
2475 int bio_error = bp->bio_error;
2476 uint16_t flags = bp->bio_flags;
2477
2478 opcode = job->uaiocb.aio_lio_opcode;
2479
2480 aio_biocleanup(bp);
2481
2482 nbytes = bcount - resid;
2483 atomic_add_acq_long(&job->nbytes, nbytes);
2484 nblks = btodb(nbytes);
2485
2486 /*
2487 * If multiple bios experienced an error, the job will reflect the
2488 * error of whichever failed bio completed last.
2489 */
2490 if (flags & BIO_ERROR)
2491 atomic_store_int(&job->error, bio_error);
2492 if (opcode & LIO_WRITE)
2493 atomic_add_int(&job->outblock, nblks);
2494 else
2495 atomic_add_int(&job->inblock, nblks);
2496
2497 if (refcount_release(&job->nbio)) {
2498 bio_error = atomic_load_int(&job->error);
2499 if (bio_error != 0)
2500 aio_complete(job, -1, bio_error);
2501 else
2502 aio_complete(job, atomic_load_long(&job->nbytes), 0);
2503 }
2504 }
2505
2506 /* syscall - wait for the next completion of an aio request */
2507 static int
kern_aio_waitcomplete(struct thread * td,struct aiocb ** ujobp,struct timespec * ts,struct aiocb_ops * ops)2508 kern_aio_waitcomplete(struct thread *td, struct aiocb **ujobp,
2509 struct timespec *ts, struct aiocb_ops *ops)
2510 {
2511 struct proc *p = td->td_proc;
2512 struct timeval atv;
2513 struct kaioinfo *ki;
2514 struct kaiocb *job;
2515 struct aiocb *ujob;
2516 long error, status;
2517 int timo;
2518
2519 ops->store_aiocb(ujobp, NULL);
2520
2521 if (ts == NULL) {
2522 timo = 0;
2523 } else if (ts->tv_sec == 0 && ts->tv_nsec == 0) {
2524 timo = -1;
2525 } else {
2526 if ((ts->tv_nsec < 0) || (ts->tv_nsec >= 1000000000))
2527 return (EINVAL);
2528
2529 TIMESPEC_TO_TIMEVAL(&atv, ts);
2530 if (itimerfix(&atv))
2531 return (EINVAL);
2532 timo = tvtohz(&atv);
2533 }
2534
2535 if (p->p_aioinfo == NULL)
2536 aio_init_aioinfo(p);
2537 ki = p->p_aioinfo;
2538
2539 error = 0;
2540 job = NULL;
2541 AIO_LOCK(ki);
2542 while ((job = TAILQ_FIRST(&ki->kaio_done)) == NULL) {
2543 if (timo == -1) {
2544 error = EWOULDBLOCK;
2545 break;
2546 }
2547 ki->kaio_flags |= KAIO_WAKEUP;
2548 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
2549 "aiowc", timo);
2550 if (timo && error == ERESTART)
2551 error = EINTR;
2552 if (error)
2553 break;
2554 }
2555
2556 if (job != NULL) {
2557 MPASS(job->jobflags & KAIOCB_FINISHED);
2558 ujob = job->ujob;
2559 status = job->uaiocb._aiocb_private.status;
2560 error = job->uaiocb._aiocb_private.error;
2561 td->td_retval[0] = status;
2562 td->td_ru.ru_oublock += job->outblock;
2563 td->td_ru.ru_inblock += job->inblock;
2564 td->td_ru.ru_msgsnd += job->msgsnd;
2565 td->td_ru.ru_msgrcv += job->msgrcv;
2566 aio_free_entry(job);
2567 AIO_UNLOCK(ki);
2568 ops->store_aiocb(ujobp, ujob);
2569 ops->store_error(ujob, error);
2570 ops->store_status(ujob, status);
2571 } else
2572 AIO_UNLOCK(ki);
2573
2574 return (error);
2575 }
2576
2577 int
sys_aio_waitcomplete(struct thread * td,struct aio_waitcomplete_args * uap)2578 sys_aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap)
2579 {
2580 struct timespec ts, *tsp;
2581 int error;
2582
2583 if (uap->timeout) {
2584 /* Get timespec struct. */
2585 error = copyin(uap->timeout, &ts, sizeof(ts));
2586 if (error)
2587 return (error);
2588 tsp = &ts;
2589 } else
2590 tsp = NULL;
2591
2592 return (kern_aio_waitcomplete(td, uap->aiocbp, tsp, &aiocb_ops));
2593 }
2594
2595 static int
kern_aio_fsync(struct thread * td,int op,struct aiocb * ujob,struct aiocb_ops * ops)2596 kern_aio_fsync(struct thread *td, int op, struct aiocb *ujob,
2597 struct aiocb_ops *ops)
2598 {
2599 int listop;
2600
2601 switch (op) {
2602 case O_SYNC:
2603 listop = LIO_SYNC;
2604 break;
2605 case O_DSYNC:
2606 listop = LIO_DSYNC;
2607 break;
2608 default:
2609 return (EINVAL);
2610 }
2611
2612 return (aio_aqueue(td, ujob, NULL, listop, ops));
2613 }
2614
2615 int
sys_aio_fsync(struct thread * td,struct aio_fsync_args * uap)2616 sys_aio_fsync(struct thread *td, struct aio_fsync_args *uap)
2617 {
2618
2619 return (kern_aio_fsync(td, uap->op, uap->aiocbp, &aiocb_ops));
2620 }
2621
2622 /* kqueue attach function */
2623 static int
filt_aioattach(struct knote * kn)2624 filt_aioattach(struct knote *kn)
2625 {
2626 struct kaiocb *job;
2627
2628 job = (struct kaiocb *)(uintptr_t)kn->kn_sdata;
2629
2630 /*
2631 * The job pointer must be validated before using it, so
2632 * registration is restricted to the kernel; the user cannot
2633 * set EV_FLAG1.
2634 */
2635 if ((kn->kn_flags & EV_FLAG1) == 0)
2636 return (EPERM);
2637 kn->kn_ptr.p_aio = job;
2638 kn->kn_flags &= ~EV_FLAG1;
2639
2640 knlist_add(&job->klist, kn, 0);
2641
2642 return (0);
2643 }
2644
2645 /* kqueue detach function */
2646 static void
filt_aiodetach(struct knote * kn)2647 filt_aiodetach(struct knote *kn)
2648 {
2649 struct knlist *knl;
2650
2651 knl = &kn->kn_ptr.p_aio->klist;
2652 knl->kl_lock(knl->kl_lockarg);
2653 if (!knlist_empty(knl))
2654 knlist_remove(knl, kn, 1);
2655 knl->kl_unlock(knl->kl_lockarg);
2656 }
2657
2658 /* kqueue filter function */
2659 /*ARGSUSED*/
2660 static int
filt_aio(struct knote * kn,long hint)2661 filt_aio(struct knote *kn, long hint)
2662 {
2663 struct kaiocb *job = kn->kn_ptr.p_aio;
2664
2665 kn->kn_data = job->uaiocb._aiocb_private.error;
2666 if (!(job->jobflags & KAIOCB_FINISHED))
2667 return (0);
2668 kn->kn_flags |= EV_EOF;
2669 return (1);
2670 }
2671
2672 /* kqueue attach function */
2673 static int
filt_lioattach(struct knote * kn)2674 filt_lioattach(struct knote *kn)
2675 {
2676 struct aioliojob *lj;
2677
2678 lj = (struct aioliojob *)(uintptr_t)kn->kn_sdata;
2679
2680 /*
2681 * The aioliojob pointer must be validated before using it, so
2682 * registration is restricted to the kernel; the user cannot
2683 * set EV_FLAG1.
2684 */
2685 if ((kn->kn_flags & EV_FLAG1) == 0)
2686 return (EPERM);
2687 kn->kn_ptr.p_lio = lj;
2688 kn->kn_flags &= ~EV_FLAG1;
2689
2690 knlist_add(&lj->klist, kn, 0);
2691
2692 return (0);
2693 }
2694
2695 /* kqueue detach function */
2696 static void
filt_liodetach(struct knote * kn)2697 filt_liodetach(struct knote *kn)
2698 {
2699 struct knlist *knl;
2700
2701 knl = &kn->kn_ptr.p_lio->klist;
2702 knl->kl_lock(knl->kl_lockarg);
2703 if (!knlist_empty(knl))
2704 knlist_remove(knl, kn, 1);
2705 knl->kl_unlock(knl->kl_lockarg);
2706 }
2707
2708 /* kqueue filter function */
2709 /*ARGSUSED*/
2710 static int
filt_lio(struct knote * kn,long hint)2711 filt_lio(struct knote *kn, long hint)
2712 {
2713 struct aioliojob * lj = kn->kn_ptr.p_lio;
2714
2715 return (lj->lioj_flags & LIOJ_KEVENT_POSTED);
2716 }
2717
2718 #ifdef COMPAT_FREEBSD32
2719 #include <sys/mount.h>
2720 #include <sys/socket.h>
2721 #include <sys/sysent.h>
2722 #include <compat/freebsd32/freebsd32.h>
2723 #include <compat/freebsd32/freebsd32_proto.h>
2724 #include <compat/freebsd32/freebsd32_signal.h>
2725 #include <compat/freebsd32/freebsd32_syscall.h>
2726 #include <compat/freebsd32/freebsd32_util.h>
2727
2728 struct __aiocb_private32 {
2729 int32_t status;
2730 int32_t error;
2731 uint32_t kernelinfo;
2732 };
2733
2734 #ifdef COMPAT_FREEBSD6
2735 typedef struct oaiocb32 {
2736 int aio_fildes; /* File descriptor */
2737 uint64_t aio_offset __packed; /* File offset for I/O */
2738 uint32_t aio_buf; /* I/O buffer in process space */
2739 uint32_t aio_nbytes; /* Number of bytes for I/O */
2740 struct osigevent32 aio_sigevent; /* Signal to deliver */
2741 int aio_lio_opcode; /* LIO opcode */
2742 int aio_reqprio; /* Request priority -- ignored */
2743 struct __aiocb_private32 _aiocb_private;
2744 } oaiocb32_t;
2745 #endif
2746
2747 typedef struct aiocb32 {
2748 int32_t aio_fildes; /* File descriptor */
2749 uint64_t aio_offset __packed; /* File offset for I/O */
2750 uint32_t aio_buf; /* I/O buffer in process space */
2751 uint32_t aio_nbytes; /* Number of bytes for I/O */
2752 int __spare__[2];
2753 uint32_t __spare2__;
2754 int aio_lio_opcode; /* LIO opcode */
2755 int aio_reqprio; /* Request priority -- ignored */
2756 struct __aiocb_private32 _aiocb_private;
2757 struct sigevent32 aio_sigevent; /* Signal to deliver */
2758 } aiocb32_t;
2759
2760 #ifdef COMPAT_FREEBSD6
2761 static int
convert_old_sigevent32(struct osigevent32 * osig,struct sigevent * nsig)2762 convert_old_sigevent32(struct osigevent32 *osig, struct sigevent *nsig)
2763 {
2764
2765 /*
2766 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are
2767 * supported by AIO with the old sigevent structure.
2768 */
2769 CP(*osig, *nsig, sigev_notify);
2770 switch (nsig->sigev_notify) {
2771 case SIGEV_NONE:
2772 break;
2773 case SIGEV_SIGNAL:
2774 nsig->sigev_signo = osig->__sigev_u.__sigev_signo;
2775 break;
2776 case SIGEV_KEVENT:
2777 nsig->sigev_notify_kqueue =
2778 osig->__sigev_u.__sigev_notify_kqueue;
2779 PTRIN_CP(*osig, *nsig, sigev_value.sival_ptr);
2780 break;
2781 default:
2782 return (EINVAL);
2783 }
2784 return (0);
2785 }
2786
2787 static int
aiocb32_copyin_old_sigevent(struct aiocb * ujob,struct kaiocb * kjob,int type __unused)2788 aiocb32_copyin_old_sigevent(struct aiocb *ujob, struct kaiocb *kjob,
2789 int type __unused)
2790 {
2791 struct oaiocb32 job32;
2792 struct aiocb *kcb = &kjob->uaiocb;
2793 int error;
2794
2795 bzero(kcb, sizeof(struct aiocb));
2796 error = copyin(ujob, &job32, sizeof(job32));
2797 if (error)
2798 return (error);
2799
2800 /* No need to copyin aio_iov, because it did not exist in FreeBSD 6 */
2801
2802 CP(job32, *kcb, aio_fildes);
2803 CP(job32, *kcb, aio_offset);
2804 PTRIN_CP(job32, *kcb, aio_buf);
2805 CP(job32, *kcb, aio_nbytes);
2806 CP(job32, *kcb, aio_lio_opcode);
2807 CP(job32, *kcb, aio_reqprio);
2808 CP(job32, *kcb, _aiocb_private.status);
2809 CP(job32, *kcb, _aiocb_private.error);
2810 PTRIN_CP(job32, *kcb, _aiocb_private.kernelinfo);
2811 return (convert_old_sigevent32(&job32.aio_sigevent,
2812 &kcb->aio_sigevent));
2813 }
2814 #endif
2815
2816 static int
aiocb32_copyin(struct aiocb * ujob,struct kaiocb * kjob,int type)2817 aiocb32_copyin(struct aiocb *ujob, struct kaiocb *kjob, int type)
2818 {
2819 struct aiocb32 job32;
2820 struct aiocb *kcb = &kjob->uaiocb;
2821 struct iovec32 *iov32;
2822 int error;
2823
2824 error = copyin(ujob, &job32, sizeof(job32));
2825 if (error)
2826 return (error);
2827 CP(job32, *kcb, aio_fildes);
2828 CP(job32, *kcb, aio_offset);
2829 CP(job32, *kcb, aio_lio_opcode);
2830 if (type == LIO_NOP)
2831 type = kcb->aio_lio_opcode;
2832 if (type & LIO_VECTORED) {
2833 iov32 = PTRIN(job32.aio_iov);
2834 CP(job32, *kcb, aio_iovcnt);
2835 /* malloc a uio and copy in the iovec */
2836 error = freebsd32_copyinuio(iov32,
2837 kcb->aio_iovcnt, &kjob->uiop);
2838 if (error)
2839 return (error);
2840 } else {
2841 PTRIN_CP(job32, *kcb, aio_buf);
2842 CP(job32, *kcb, aio_nbytes);
2843 }
2844 CP(job32, *kcb, aio_reqprio);
2845 CP(job32, *kcb, _aiocb_private.status);
2846 CP(job32, *kcb, _aiocb_private.error);
2847 PTRIN_CP(job32, *kcb, _aiocb_private.kernelinfo);
2848 error = convert_sigevent32(&job32.aio_sigevent, &kcb->aio_sigevent);
2849
2850 return (error);
2851 }
2852
2853 static long
aiocb32_fetch_status(struct aiocb * ujob)2854 aiocb32_fetch_status(struct aiocb *ujob)
2855 {
2856 struct aiocb32 *ujob32;
2857
2858 ujob32 = (struct aiocb32 *)ujob;
2859 return (fuword32(&ujob32->_aiocb_private.status));
2860 }
2861
2862 static long
aiocb32_fetch_error(struct aiocb * ujob)2863 aiocb32_fetch_error(struct aiocb *ujob)
2864 {
2865 struct aiocb32 *ujob32;
2866
2867 ujob32 = (struct aiocb32 *)ujob;
2868 return (fuword32(&ujob32->_aiocb_private.error));
2869 }
2870
2871 static int
aiocb32_store_status(struct aiocb * ujob,long status)2872 aiocb32_store_status(struct aiocb *ujob, long status)
2873 {
2874 struct aiocb32 *ujob32;
2875
2876 ujob32 = (struct aiocb32 *)ujob;
2877 return (suword32(&ujob32->_aiocb_private.status, status));
2878 }
2879
2880 static int
aiocb32_store_error(struct aiocb * ujob,long error)2881 aiocb32_store_error(struct aiocb *ujob, long error)
2882 {
2883 struct aiocb32 *ujob32;
2884
2885 ujob32 = (struct aiocb32 *)ujob;
2886 return (suword32(&ujob32->_aiocb_private.error, error));
2887 }
2888
2889 static int
aiocb32_store_kernelinfo(struct aiocb * ujob,long jobref)2890 aiocb32_store_kernelinfo(struct aiocb *ujob, long jobref)
2891 {
2892 struct aiocb32 *ujob32;
2893
2894 ujob32 = (struct aiocb32 *)ujob;
2895 return (suword32(&ujob32->_aiocb_private.kernelinfo, jobref));
2896 }
2897
2898 static int
aiocb32_store_aiocb(struct aiocb ** ujobp,struct aiocb * ujob)2899 aiocb32_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob)
2900 {
2901
2902 return (suword32(ujobp, (long)ujob));
2903 }
2904
2905 static struct aiocb_ops aiocb32_ops = {
2906 .aio_copyin = aiocb32_copyin,
2907 .fetch_status = aiocb32_fetch_status,
2908 .fetch_error = aiocb32_fetch_error,
2909 .store_status = aiocb32_store_status,
2910 .store_error = aiocb32_store_error,
2911 .store_kernelinfo = aiocb32_store_kernelinfo,
2912 .store_aiocb = aiocb32_store_aiocb,
2913 };
2914
2915 #ifdef COMPAT_FREEBSD6
2916 static struct aiocb_ops aiocb32_ops_osigevent = {
2917 .aio_copyin = aiocb32_copyin_old_sigevent,
2918 .fetch_status = aiocb32_fetch_status,
2919 .fetch_error = aiocb32_fetch_error,
2920 .store_status = aiocb32_store_status,
2921 .store_error = aiocb32_store_error,
2922 .store_kernelinfo = aiocb32_store_kernelinfo,
2923 .store_aiocb = aiocb32_store_aiocb,
2924 };
2925 #endif
2926
2927 int
freebsd32_aio_return(struct thread * td,struct freebsd32_aio_return_args * uap)2928 freebsd32_aio_return(struct thread *td, struct freebsd32_aio_return_args *uap)
2929 {
2930
2931 return (kern_aio_return(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops));
2932 }
2933
2934 int
freebsd32_aio_suspend(struct thread * td,struct freebsd32_aio_suspend_args * uap)2935 freebsd32_aio_suspend(struct thread *td, struct freebsd32_aio_suspend_args *uap)
2936 {
2937 struct timespec32 ts32;
2938 struct timespec ts, *tsp;
2939 struct aiocb **ujoblist;
2940 uint32_t *ujoblist32;
2941 int error, i;
2942
2943 if (uap->nent < 0 || uap->nent > max_aio_queue_per_proc)
2944 return (EINVAL);
2945
2946 if (uap->timeout) {
2947 /* Get timespec struct. */
2948 if ((error = copyin(uap->timeout, &ts32, sizeof(ts32))) != 0)
2949 return (error);
2950 CP(ts32, ts, tv_sec);
2951 CP(ts32, ts, tv_nsec);
2952 tsp = &ts;
2953 } else
2954 tsp = NULL;
2955
2956 ujoblist = malloc(uap->nent * sizeof(ujoblist[0]), M_AIO, M_WAITOK);
2957 ujoblist32 = (uint32_t *)ujoblist;
2958 error = copyin(uap->aiocbp, ujoblist32, uap->nent *
2959 sizeof(ujoblist32[0]));
2960 if (error == 0) {
2961 for (i = uap->nent - 1; i >= 0; i--)
2962 ujoblist[i] = PTRIN(ujoblist32[i]);
2963
2964 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp);
2965 }
2966 free(ujoblist, M_AIO);
2967 return (error);
2968 }
2969
2970 int
freebsd32_aio_error(struct thread * td,struct freebsd32_aio_error_args * uap)2971 freebsd32_aio_error(struct thread *td, struct freebsd32_aio_error_args *uap)
2972 {
2973
2974 return (kern_aio_error(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops));
2975 }
2976
2977 #ifdef COMPAT_FREEBSD6
2978 int
freebsd6_freebsd32_aio_read(struct thread * td,struct freebsd6_freebsd32_aio_read_args * uap)2979 freebsd6_freebsd32_aio_read(struct thread *td,
2980 struct freebsd6_freebsd32_aio_read_args *uap)
2981 {
2982
2983 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
2984 &aiocb32_ops_osigevent));
2985 }
2986 #endif
2987
2988 int
freebsd32_aio_read(struct thread * td,struct freebsd32_aio_read_args * uap)2989 freebsd32_aio_read(struct thread *td, struct freebsd32_aio_read_args *uap)
2990 {
2991
2992 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
2993 &aiocb32_ops));
2994 }
2995
2996 int
freebsd32_aio_readv(struct thread * td,struct freebsd32_aio_readv_args * uap)2997 freebsd32_aio_readv(struct thread *td, struct freebsd32_aio_readv_args *uap)
2998 {
2999
3000 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READV,
3001 &aiocb32_ops));
3002 }
3003
3004 #ifdef COMPAT_FREEBSD6
3005 int
freebsd6_freebsd32_aio_write(struct thread * td,struct freebsd6_freebsd32_aio_write_args * uap)3006 freebsd6_freebsd32_aio_write(struct thread *td,
3007 struct freebsd6_freebsd32_aio_write_args *uap)
3008 {
3009
3010 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
3011 &aiocb32_ops_osigevent));
3012 }
3013 #endif
3014
3015 int
freebsd32_aio_write(struct thread * td,struct freebsd32_aio_write_args * uap)3016 freebsd32_aio_write(struct thread *td, struct freebsd32_aio_write_args *uap)
3017 {
3018
3019 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
3020 &aiocb32_ops));
3021 }
3022
3023 int
freebsd32_aio_writev(struct thread * td,struct freebsd32_aio_writev_args * uap)3024 freebsd32_aio_writev(struct thread *td, struct freebsd32_aio_writev_args *uap)
3025 {
3026
3027 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITEV,
3028 &aiocb32_ops));
3029 }
3030
3031 int
freebsd32_aio_mlock(struct thread * td,struct freebsd32_aio_mlock_args * uap)3032 freebsd32_aio_mlock(struct thread *td, struct freebsd32_aio_mlock_args *uap)
3033 {
3034
3035 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_MLOCK,
3036 &aiocb32_ops));
3037 }
3038
3039 int
freebsd32_aio_waitcomplete(struct thread * td,struct freebsd32_aio_waitcomplete_args * uap)3040 freebsd32_aio_waitcomplete(struct thread *td,
3041 struct freebsd32_aio_waitcomplete_args *uap)
3042 {
3043 struct timespec32 ts32;
3044 struct timespec ts, *tsp;
3045 int error;
3046
3047 if (uap->timeout) {
3048 /* Get timespec struct. */
3049 error = copyin(uap->timeout, &ts32, sizeof(ts32));
3050 if (error)
3051 return (error);
3052 CP(ts32, ts, tv_sec);
3053 CP(ts32, ts, tv_nsec);
3054 tsp = &ts;
3055 } else
3056 tsp = NULL;
3057
3058 return (kern_aio_waitcomplete(td, (struct aiocb **)uap->aiocbp, tsp,
3059 &aiocb32_ops));
3060 }
3061
3062 int
freebsd32_aio_fsync(struct thread * td,struct freebsd32_aio_fsync_args * uap)3063 freebsd32_aio_fsync(struct thread *td, struct freebsd32_aio_fsync_args *uap)
3064 {
3065
3066 return (kern_aio_fsync(td, uap->op, (struct aiocb *)uap->aiocbp,
3067 &aiocb32_ops));
3068 }
3069
3070 #ifdef COMPAT_FREEBSD6
3071 int
freebsd6_freebsd32_lio_listio(struct thread * td,struct freebsd6_freebsd32_lio_listio_args * uap)3072 freebsd6_freebsd32_lio_listio(struct thread *td,
3073 struct freebsd6_freebsd32_lio_listio_args *uap)
3074 {
3075 struct aiocb **acb_list;
3076 struct sigevent *sigp, sig;
3077 struct osigevent32 osig;
3078 uint32_t *acb_list32;
3079 int error, i, nent;
3080
3081 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
3082 return (EINVAL);
3083
3084 nent = uap->nent;
3085 if (nent < 0 || nent > max_aio_queue_per_proc)
3086 return (EINVAL);
3087
3088 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
3089 error = copyin(uap->sig, &osig, sizeof(osig));
3090 if (error)
3091 return (error);
3092 error = convert_old_sigevent32(&osig, &sig);
3093 if (error)
3094 return (error);
3095 sigp = &sig;
3096 } else
3097 sigp = NULL;
3098
3099 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK);
3100 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t));
3101 if (error) {
3102 free(acb_list32, M_LIO);
3103 return (error);
3104 }
3105 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
3106 for (i = 0; i < nent; i++)
3107 acb_list[i] = PTRIN(acb_list32[i]);
3108 free(acb_list32, M_LIO);
3109
3110 error = kern_lio_listio(td, uap->mode,
3111 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
3112 &aiocb32_ops_osigevent);
3113 free(acb_list, M_LIO);
3114 return (error);
3115 }
3116 #endif
3117
3118 int
freebsd32_lio_listio(struct thread * td,struct freebsd32_lio_listio_args * uap)3119 freebsd32_lio_listio(struct thread *td, struct freebsd32_lio_listio_args *uap)
3120 {
3121 struct aiocb **acb_list;
3122 struct sigevent *sigp, sig;
3123 struct sigevent32 sig32;
3124 uint32_t *acb_list32;
3125 int error, i, nent;
3126
3127 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
3128 return (EINVAL);
3129
3130 nent = uap->nent;
3131 if (nent < 0 || nent > max_aio_queue_per_proc)
3132 return (EINVAL);
3133
3134 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
3135 error = copyin(uap->sig, &sig32, sizeof(sig32));
3136 if (error)
3137 return (error);
3138 error = convert_sigevent32(&sig32, &sig);
3139 if (error)
3140 return (error);
3141 sigp = &sig;
3142 } else
3143 sigp = NULL;
3144
3145 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK);
3146 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t));
3147 if (error) {
3148 free(acb_list32, M_LIO);
3149 return (error);
3150 }
3151 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
3152 for (i = 0; i < nent; i++)
3153 acb_list[i] = PTRIN(acb_list32[i]);
3154 free(acb_list32, M_LIO);
3155
3156 error = kern_lio_listio(td, uap->mode,
3157 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
3158 &aiocb32_ops);
3159 free(acb_list, M_LIO);
3160 return (error);
3161 }
3162
3163 #endif
3164