2 * Copyright (c) 1997 John S. Dyson. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. John S. Dyson's name may not be used to endorse or promote products
10 * derived from this software without specific prior written permission.
12 * DISCLAIMER: This code isn't warranted to do anything useful. Anything
13 * bad that happens because of using this software isn't the responsibility
14 * of the author. This software is distributed AS-IS.
18 * This file contains support for the POSIX 1003.1B AIO/LIO facility.
21 #include <sys/cdefs.h>
22 __FBSDID("$FreeBSD$");
24 #include <sys/param.h>
25 #include <sys/systm.h>
26 #include <sys/malloc.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>
37 #include <sys/limits.h>
39 #include <sys/mutex.h>
40 #include <sys/unistd.h>
41 #include <sys/posix4.h>
43 #include <sys/resourcevar.h>
44 #include <sys/signalvar.h>
45 #include <sys/protosw.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/syscall.h>
50 #include <sys/sysent.h>
51 #include <sys/sysctl.h>
53 #include <sys/taskqueue.h>
54 #include <sys/vnode.h>
56 #include <sys/event.h>
57 #include <sys/mount.h>
59 #include <machine/atomic.h>
62 #include <vm/vm_extern.h>
64 #include <vm/vm_map.h>
65 #include <vm/vm_object.h>
69 #include "opt_vfs_aio.h"
72 * Counter for allocating reference ids to new jobs. Wrapped to 1 on
73 * overflow. (XXX will be removed soon.)
75 static u_long jobrefid;
78 * Counter for aio_fsync.
80 static uint64_t jobseqno;
83 #define JOBST_JOBQSOCK 1
84 #define JOBST_JOBQGLOBAL 2
85 #define JOBST_JOBRUNNING 3
86 #define JOBST_JOBFINISHED 4
87 #define JOBST_JOBQBUF 5
88 #define JOBST_JOBQSYNC 6
90 #ifndef MAX_AIO_PER_PROC
91 #define MAX_AIO_PER_PROC 32
94 #ifndef MAX_AIO_QUEUE_PER_PROC
95 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */
99 #define MAX_AIO_PROCS 32
102 #ifndef MAX_AIO_QUEUE
103 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */
106 #ifndef TARGET_AIO_PROCS
107 #define TARGET_AIO_PROCS 4
111 #define MAX_BUF_AIO 16
114 #ifndef AIOD_TIMEOUT_DEFAULT
115 #define AIOD_TIMEOUT_DEFAULT (10 * hz)
118 #ifndef AIOD_LIFETIME_DEFAULT
119 #define AIOD_LIFETIME_DEFAULT (30 * hz)
122 static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management");
124 static int max_aio_procs = MAX_AIO_PROCS;
125 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs,
126 CTLFLAG_RW, &max_aio_procs, 0,
127 "Maximum number of kernel threads to use for handling async IO ");
129 static int num_aio_procs = 0;
130 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs,
131 CTLFLAG_RD, &num_aio_procs, 0,
132 "Number of presently active kernel threads for async IO");
135 * The code will adjust the actual number of AIO processes towards this
136 * number when it gets a chance.
138 static int target_aio_procs = TARGET_AIO_PROCS;
139 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs,
140 0, "Preferred number of ready kernel threads for async IO");
142 static int max_queue_count = MAX_AIO_QUEUE;
143 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0,
144 "Maximum number of aio requests to queue, globally");
146 static int num_queue_count = 0;
147 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0,
148 "Number of queued aio requests");
150 static int num_buf_aio = 0;
151 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
152 "Number of aio requests presently handled by the buf subsystem");
154 /* Number of async I/O thread in the process of being started */
155 /* XXX This should be local to aio_aqueue() */
156 static int num_aio_resv_start = 0;
158 static int aiod_timeout;
159 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0,
160 "Timeout value for synchronous aio operations");
162 static int aiod_lifetime;
163 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0,
164 "Maximum lifetime for idle aiod");
166 static int unloadable = 0;
167 SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0,
168 "Allow unload of aio (not recommended)");
171 static int max_aio_per_proc = MAX_AIO_PER_PROC;
172 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
173 0, "Maximum active aio requests per process (stored in the process)");
175 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
176 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
177 &max_aio_queue_per_proc, 0,
178 "Maximum queued aio requests per process (stored in the process)");
180 static int max_buf_aio = MAX_BUF_AIO;
181 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
182 "Maximum buf aio requests per process (stored in the process)");
184 typedef struct oaiocb {
185 int aio_fildes; /* File descriptor */
186 off_t aio_offset; /* File offset for I/O */
187 volatile void *aio_buf; /* I/O buffer in process space */
188 size_t aio_nbytes; /* Number of bytes for I/O */
189 struct osigevent aio_sigevent; /* Signal to deliver */
190 int aio_lio_opcode; /* LIO opcode */
191 int aio_reqprio; /* Request priority -- ignored */
192 struct __aiocb_private _aiocb_private;
196 * Below is a key of locks used to protect each member of struct aiocblist
197 * aioliojob and kaioinfo and any backends.
199 * * - need not protected
200 * a - locked by kaioinfo lock
201 * b - locked by backend lock, the backend lock can be null in some cases,
202 * for example, BIO belongs to this type, in this case, proc lock is
204 * c - locked by aio_job_mtx, the lock for the generic file I/O backend.
208 * Current, there is only two backends: BIO and generic file I/O.
209 * socket I/O is served by generic file I/O, this is not a good idea, since
210 * disk file I/O and any other types without O_NONBLOCK flag can block daemon
211 * threads, if there is no thread to serve socket I/O, the socket I/O will be
212 * delayed too long or starved, we should create some threads dedicated to
213 * sockets to do non-blocking I/O, same for pipe and fifo, for these I/O
214 * systems we really need non-blocking interface, fiddling O_NONBLOCK in file
215 * structure is not safe because there is race between userland and aio
220 TAILQ_ENTRY(aiocblist) list; /* (b) internal list of for backend */
221 TAILQ_ENTRY(aiocblist) plist; /* (a) list of jobs for each backend */
222 TAILQ_ENTRY(aiocblist) allist; /* (a) list of all jobs in proc */
223 int jobflags; /* (a) job flags */
224 int jobstate; /* (b) job state */
225 int inputcharge; /* (*) input blockes */
226 int outputcharge; /* (*) output blockes */
227 struct buf *bp; /* (*) private to BIO backend,
230 struct proc *userproc; /* (*) user process */
231 struct ucred *cred; /* (*) active credential when created */
232 struct file *fd_file; /* (*) pointer to file structure */
233 struct aioliojob *lio; /* (*) optional lio job */
234 struct aiocb *uuaiocb; /* (*) pointer in userspace of aiocb */
235 struct knlist klist; /* (a) list of knotes */
236 struct aiocb uaiocb; /* (*) kernel I/O control block */
237 ksiginfo_t ksi; /* (a) realtime signal info */
238 struct task biotask; /* (*) private to BIO backend */
239 uint64_t seqno; /* (*) job number */
240 int pending; /* (a) number of pending I/O, aio_fsync only */
244 #define AIOCBLIST_DONE 0x01
245 #define AIOCBLIST_BUFDONE 0x02
246 #define AIOCBLIST_RUNDOWN 0x04
247 #define AIOCBLIST_CHECKSYNC 0x08
252 #define AIOP_FREE 0x1 /* proc on free queue */
254 struct aiothreadlist {
255 int aiothreadflags; /* (c) AIO proc flags */
256 TAILQ_ENTRY(aiothreadlist) list; /* (c) list of processes */
257 struct thread *aiothread; /* (*) the AIO thread */
261 * data-structure for lio signal management
264 int lioj_flags; /* (a) listio flags */
265 int lioj_count; /* (a) listio flags */
266 int lioj_finished_count; /* (a) listio flags */
267 struct sigevent lioj_signal; /* (a) signal on all I/O done */
268 TAILQ_ENTRY(aioliojob) lioj_list; /* (a) lio list */
269 struct knlist klist; /* (a) list of knotes */
270 ksiginfo_t lioj_ksi; /* (a) Realtime signal info */
273 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */
274 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */
275 #define LIOJ_KEVENT_POSTED 0x4 /* kevent triggered */
278 * per process aio data structure
281 struct mtx kaio_mtx; /* the lock to protect this struct */
282 int kaio_flags; /* (a) per process kaio flags */
283 int kaio_maxactive_count; /* (*) maximum number of AIOs */
284 int kaio_active_count; /* (c) number of currently used AIOs */
285 int kaio_qallowed_count; /* (*) maxiumu size of AIO queue */
286 int kaio_count; /* (a) size of AIO queue */
287 int kaio_ballowed_count; /* (*) maximum number of buffers */
288 int kaio_buffer_count; /* (a) number of physio buffers */
289 TAILQ_HEAD(,aiocblist) kaio_all; /* (a) all AIOs in the process */
290 TAILQ_HEAD(,aiocblist) kaio_done; /* (a) done queue for process */
291 TAILQ_HEAD(,aioliojob) kaio_liojoblist; /* (a) list of lio jobs */
292 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* (a) job queue for process */
293 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* (a) buffer job queue for process */
294 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* (a) queue for aios waiting on sockets,
297 TAILQ_HEAD(,aiocblist) kaio_syncqueue; /* (a) queue for aio_fsync */
298 struct task kaio_task; /* (*) task to kick aio threads */
301 #define AIO_LOCK(ki) mtx_lock(&(ki)->kaio_mtx)
302 #define AIO_UNLOCK(ki) mtx_unlock(&(ki)->kaio_mtx)
303 #define AIO_LOCK_ASSERT(ki, f) mtx_assert(&(ki)->kaio_mtx, (f))
304 #define AIO_MTX(ki) (&(ki)->kaio_mtx)
306 #define KAIO_RUNDOWN 0x1 /* process is being run down */
307 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */
309 static TAILQ_HEAD(,aiothreadlist) aio_freeproc; /* (c) Idle daemons */
310 static struct sema aio_newproc_sem;
311 static struct mtx aio_job_mtx;
312 static struct mtx aio_sock_mtx;
313 static TAILQ_HEAD(,aiocblist) aio_jobs; /* (c) Async job list */
314 static struct unrhdr *aiod_unr;
316 void aio_init_aioinfo(struct proc *p);
317 static void aio_onceonly(void);
318 static int aio_free_entry(struct aiocblist *aiocbe);
319 static void aio_process(struct aiocblist *aiocbe);
320 static int aio_newproc(int *);
321 int aio_aqueue(struct thread *td, struct aiocb *job,
322 struct aioliojob *lio, int type, int osigev);
323 static void aio_physwakeup(struct buf *bp);
324 static void aio_proc_rundown(void *arg, struct proc *p);
325 static void aio_proc_rundown_exec(void *arg, struct proc *p, struct image_params *imgp);
326 static int aio_qphysio(struct proc *p, struct aiocblist *iocb);
327 static void biohelper(void *, int);
328 static void aio_daemon(void *param);
329 static void aio_swake_cb(struct socket *, struct sockbuf *);
330 static int aio_unload(void);
331 static void aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type);
334 static int do_lio_listio(struct thread *td, struct lio_listio_args *uap, int oldsigev);
335 static int aio_kick(struct proc *userp);
336 static void aio_kick_nowait(struct proc *userp);
337 static void aio_kick_helper(void *context, int pending);
338 static int filt_aioattach(struct knote *kn);
339 static void filt_aiodetach(struct knote *kn);
340 static int filt_aio(struct knote *kn, long hint);
341 static int filt_lioattach(struct knote *kn);
342 static void filt_liodetach(struct knote *kn);
343 static int filt_lio(struct knote *kn, long hint);
347 * kaio Per process async io info
348 * aiop async io thread data
349 * aiocb async io jobs
350 * aiol list io job pointer - internal to aio_suspend XXX
351 * aiolio list io jobs
353 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone;
355 /* kqueue filters for aio */
356 static struct filterops aio_filtops =
357 { 0, filt_aioattach, filt_aiodetach, filt_aio };
358 static struct filterops lio_filtops =
359 { 0, filt_lioattach, filt_liodetach, filt_lio };
361 static eventhandler_tag exit_tag, exec_tag;
363 TASKQUEUE_DEFINE_THREAD(aiod_bio);
366 * Main operations function for use as a kernel module.
369 aio_modload(struct module *module, int cmd, void *arg)
378 error = aio_unload();
389 static moduledata_t aio_mod = {
395 SYSCALL_MODULE_HELPER(aio_cancel);
396 SYSCALL_MODULE_HELPER(aio_error);
397 SYSCALL_MODULE_HELPER(aio_fsync);
398 SYSCALL_MODULE_HELPER(aio_read);
399 SYSCALL_MODULE_HELPER(aio_return);
400 SYSCALL_MODULE_HELPER(aio_suspend);
401 SYSCALL_MODULE_HELPER(aio_waitcomplete);
402 SYSCALL_MODULE_HELPER(aio_write);
403 SYSCALL_MODULE_HELPER(lio_listio);
404 SYSCALL_MODULE_HELPER(oaio_read);
405 SYSCALL_MODULE_HELPER(oaio_write);
406 SYSCALL_MODULE_HELPER(olio_listio);
408 DECLARE_MODULE(aio, aio_mod,
409 SI_SUB_VFS, SI_ORDER_ANY);
410 MODULE_VERSION(aio, 1);
413 * Startup initialization
419 /* XXX: should probably just use so->callback */
420 aio_swake = &aio_swake_cb;
421 exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL,
422 EVENTHANDLER_PRI_ANY);
423 exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown_exec, NULL,
424 EVENTHANDLER_PRI_ANY);
425 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops);
426 kqueue_add_filteropts(EVFILT_LIO, &lio_filtops);
427 TAILQ_INIT(&aio_freeproc);
428 sema_init(&aio_newproc_sem, 0, "aio_new_proc");
429 mtx_init(&aio_job_mtx, "aio_job", NULL, MTX_DEF);
430 mtx_init(&aio_sock_mtx, "aio_sock", NULL, MTX_DEF);
431 TAILQ_INIT(&aio_jobs);
432 aiod_unr = new_unrhdr(1, INT_MAX, NULL);
433 kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL,
434 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
435 aiop_zone = uma_zcreate("AIOP", sizeof(struct aiothreadlist), NULL,
436 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
437 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct aiocblist), NULL, NULL,
438 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
439 aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL,
440 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
441 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL,
442 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
443 aiod_timeout = AIOD_TIMEOUT_DEFAULT;
444 aiod_lifetime = AIOD_LIFETIME_DEFAULT;
446 async_io_version = _POSIX_VERSION;
447 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX);
448 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE);
449 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0);
453 * Callback for unload of AIO when used as a module.
461 * XXX: no unloads by default, it's too dangerous.
462 * perhaps we could do it if locked out callers and then
463 * did an aio_proc_rundown() on each process.
465 * jhb: aio_proc_rundown() needs to run on curproc though,
466 * so I don't think that would fly.
471 error = kqueue_del_filteropts(EVFILT_AIO);
474 error = kqueue_del_filteropts(EVFILT_LIO);
477 async_io_version = 0;
479 taskqueue_free(taskqueue_aiod_bio);
480 delete_unrhdr(aiod_unr);
481 uma_zdestroy(kaio_zone);
482 uma_zdestroy(aiop_zone);
483 uma_zdestroy(aiocb_zone);
484 uma_zdestroy(aiol_zone);
485 uma_zdestroy(aiolio_zone);
486 EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
487 EVENTHANDLER_DEREGISTER(process_exec, exec_tag);
488 mtx_destroy(&aio_job_mtx);
489 mtx_destroy(&aio_sock_mtx);
490 sema_destroy(&aio_newproc_sem);
491 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, -1);
492 p31b_setcfg(CTL_P1003_1B_AIO_MAX, -1);
493 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, -1);
498 * Init the per-process aioinfo structure. The aioinfo limits are set
499 * per-process for user limit (resource) management.
502 aio_init_aioinfo(struct proc *p)
506 ki = uma_zalloc(kaio_zone, M_WAITOK);
507 mtx_init(&ki->kaio_mtx, "aiomtx", NULL, MTX_DEF);
509 ki->kaio_maxactive_count = max_aio_per_proc;
510 ki->kaio_active_count = 0;
511 ki->kaio_qallowed_count = max_aio_queue_per_proc;
513 ki->kaio_ballowed_count = max_buf_aio;
514 ki->kaio_buffer_count = 0;
515 TAILQ_INIT(&ki->kaio_all);
516 TAILQ_INIT(&ki->kaio_done);
517 TAILQ_INIT(&ki->kaio_jobqueue);
518 TAILQ_INIT(&ki->kaio_bufqueue);
519 TAILQ_INIT(&ki->kaio_liojoblist);
520 TAILQ_INIT(&ki->kaio_sockqueue);
521 TAILQ_INIT(&ki->kaio_syncqueue);
522 TASK_INIT(&ki->kaio_task, 0, aio_kick_helper, p);
524 if (p->p_aioinfo == NULL) {
529 mtx_destroy(&ki->kaio_mtx);
530 uma_zfree(kaio_zone, ki);
533 while (num_aio_procs < target_aio_procs)
538 aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi)
544 ksi->ksi_code = SI_ASYNCIO;
545 ksi->ksi_flags |= KSI_EXT | KSI_INS;
546 ret = psignal_event(p, sigev, ksi);
553 * Free a job entry. Wait for completion if it is currently active, but don't
554 * delay forever. If we delay, we return a flag that says that we have to
555 * restart the queue scan.
558 aio_free_entry(struct aiocblist *aiocbe)
561 struct aioliojob *lj;
564 p = aiocbe->userproc;
569 AIO_LOCK_ASSERT(ki, MA_OWNED);
570 MPASS(aiocbe->jobstate == JOBST_JOBFINISHED);
572 atomic_subtract_int(&num_queue_count, 1);
575 MPASS(ki->kaio_count >= 0);
577 TAILQ_REMOVE(&ki->kaio_done, aiocbe, plist);
578 TAILQ_REMOVE(&ki->kaio_all, aiocbe, allist);
583 lj->lioj_finished_count--;
585 if (lj->lioj_count == 0) {
586 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
587 /* lio is going away, we need to destroy any knotes */
588 knlist_delete(&lj->klist, curthread, 1);
590 sigqueue_take(&lj->lioj_ksi);
592 uma_zfree(aiolio_zone, lj);
596 /* aiocbe is going away, we need to destroy any knotes */
597 knlist_delete(&aiocbe->klist, curthread, 1);
599 sigqueue_take(&aiocbe->ksi);
602 MPASS(aiocbe->bp == NULL);
603 aiocbe->jobstate = JOBST_NULL;
607 * The thread argument here is used to find the owning process
608 * and is also passed to fo_close() which may pass it to various
609 * places such as devsw close() routines. Because of that, we
610 * need a thread pointer from the process owning the job that is
611 * persistent and won't disappear out from under us or move to
614 * Currently, all the callers of this function call it to remove
615 * an aiocblist from the current process' job list either via a
616 * syscall or due to the current process calling exit() or
617 * execve(). Thus, we know that p == curproc. We also know that
618 * curthread can't exit since we are curthread.
620 * Therefore, we use curthread as the thread to pass to
621 * knlist_delete(). This does mean that it is possible for the
622 * thread pointer at close time to differ from the thread pointer
623 * at open time, but this is already true of file descriptors in
624 * a multithreaded process.
626 fdrop(aiocbe->fd_file, curthread);
627 crfree(aiocbe->cred);
628 uma_zfree(aiocb_zone, aiocbe);
635 aio_proc_rundown_exec(void *arg, struct proc *p, struct image_params *imgp __unused)
637 aio_proc_rundown(arg, p);
641 * Rundown the jobs for a given process.
644 aio_proc_rundown(void *arg, struct proc *p)
647 struct aioliojob *lj;
648 struct aiocblist *cbe, *cbn;
653 KASSERT(curthread->td_proc == p,
654 ("%s: called on non-curproc", __func__));
660 ki->kaio_flags |= KAIO_RUNDOWN;
665 * Try to cancel all pending requests. This code simulates
666 * aio_cancel on all pending I/O requests.
668 TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) {
670 mtx_lock(&aio_job_mtx);
671 if (cbe->jobstate == JOBST_JOBQGLOBAL) {
672 TAILQ_REMOVE(&aio_jobs, cbe, list);
674 } else if (cbe->jobstate == JOBST_JOBQSOCK) {
676 MPASS(fp->f_type == DTYPE_SOCKET);
678 TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
680 } else if (cbe->jobstate == JOBST_JOBQSYNC) {
681 TAILQ_REMOVE(&ki->kaio_syncqueue, cbe, list);
684 mtx_unlock(&aio_job_mtx);
687 cbe->jobstate = JOBST_JOBFINISHED;
688 cbe->uaiocb._aiocb_private.status = -1;
689 cbe->uaiocb._aiocb_private.error = ECANCELED;
690 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
691 aio_bio_done_notify(p, cbe, DONE_QUEUE);
695 /* Wait for all running I/O to be finished */
696 if (TAILQ_FIRST(&ki->kaio_bufqueue) ||
697 TAILQ_FIRST(&ki->kaio_jobqueue)) {
698 ki->kaio_flags |= KAIO_WAKEUP;
699 msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO, "aioprn", hz);
703 /* Free all completed I/O requests. */
704 while ((cbe = TAILQ_FIRST(&ki->kaio_done)) != NULL)
707 while ((lj = TAILQ_FIRST(&ki->kaio_liojoblist)) != NULL) {
708 if (lj->lioj_count == 0) {
709 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
710 knlist_delete(&lj->klist, curthread, 1);
712 sigqueue_take(&lj->lioj_ksi);
714 uma_zfree(aiolio_zone, lj);
716 panic("LIO job not cleaned up: C:%d, FC:%d\n",
717 lj->lioj_count, lj->lioj_finished_count);
721 taskqueue_drain(taskqueue_aiod_bio, &ki->kaio_task);
722 uma_zfree(kaio_zone, ki);
727 * Select a job to run (called by an AIO daemon).
729 static struct aiocblist *
730 aio_selectjob(struct aiothreadlist *aiop)
732 struct aiocblist *aiocbe;
736 mtx_assert(&aio_job_mtx, MA_OWNED);
737 TAILQ_FOREACH(aiocbe, &aio_jobs, list) {
738 userp = aiocbe->userproc;
739 ki = userp->p_aioinfo;
741 if (ki->kaio_active_count < ki->kaio_maxactive_count) {
742 TAILQ_REMOVE(&aio_jobs, aiocbe, list);
743 /* Account for currently active jobs. */
744 ki->kaio_active_count++;
745 aiocbe->jobstate = JOBST_JOBRUNNING;
753 * Move all data to a permanent storage device, this code
754 * simulates fsync syscall.
757 aio_fsync_vnode(struct thread *td, struct vnode *vp)
763 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
764 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
766 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
767 if (vp->v_object != NULL) {
768 VM_OBJECT_LOCK(vp->v_object);
769 vm_object_page_clean(vp->v_object, 0, 0, 0);
770 VM_OBJECT_UNLOCK(vp->v_object);
772 error = VOP_FSYNC(vp, MNT_WAIT, td);
774 VOP_UNLOCK(vp, 0, td);
775 vn_finished_write(mp);
777 VFS_UNLOCK_GIANT(vfslocked);
782 * The AIO processing activity. This is the code that does the I/O request for
783 * the non-physio version of the operations. The normal vn operations are used,
784 * and this code should work in all instances for every type of file, including
785 * pipes, sockets, fifos, and regular files.
787 * XXX I don't think it works well for socket, pipe, and fifo.
790 aio_process(struct aiocblist *aiocbe)
792 struct ucred *td_savedcred;
801 int oublock_st, oublock_end;
802 int inblock_st, inblock_end;
805 td_savedcred = td->td_ucred;
806 td->td_ucred = aiocbe->cred;
807 cb = &aiocbe->uaiocb;
808 fp = aiocbe->fd_file;
810 if (cb->aio_lio_opcode == LIO_SYNC) {
813 if (fp->f_vnode != NULL)
814 error = aio_fsync_vnode(td, fp->f_vnode);
815 cb->_aiocb_private.error = error;
816 cb->_aiocb_private.status = 0;
817 td->td_ucred = td_savedcred;
821 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
822 aiov.iov_len = cb->aio_nbytes;
824 auio.uio_iov = &aiov;
826 auio.uio_offset = cb->aio_offset;
827 auio.uio_resid = cb->aio_nbytes;
828 cnt = cb->aio_nbytes;
829 auio.uio_segflg = UIO_USERSPACE;
832 inblock_st = td->td_ru.ru_inblock;
833 oublock_st = td->td_ru.ru_oublock;
835 * aio_aqueue() acquires a reference to the file that is
836 * released in aio_free_entry().
838 if (cb->aio_lio_opcode == LIO_READ) {
839 auio.uio_rw = UIO_READ;
840 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td);
842 if (fp->f_type == DTYPE_VNODE)
844 auio.uio_rw = UIO_WRITE;
845 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td);
847 inblock_end = td->td_ru.ru_inblock;
848 oublock_end = td->td_ru.ru_oublock;
850 aiocbe->inputcharge = inblock_end - inblock_st;
851 aiocbe->outputcharge = oublock_end - oublock_st;
853 if ((error) && (auio.uio_resid != cnt)) {
854 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
856 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) {
858 if (fp->f_type == DTYPE_SOCKET) {
860 if (so->so_options & SO_NOSIGPIPE)
864 PROC_LOCK(aiocbe->userproc);
865 psignal(aiocbe->userproc, SIGPIPE);
866 PROC_UNLOCK(aiocbe->userproc);
871 cnt -= auio.uio_resid;
872 cb->_aiocb_private.error = error;
873 cb->_aiocb_private.status = cnt;
874 td->td_ucred = td_savedcred;
878 aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type)
880 struct aioliojob *lj;
882 struct aiocblist *scb, *scbn;
885 ki = userp->p_aioinfo;
886 AIO_LOCK_ASSERT(ki, MA_OWNED);
890 lj->lioj_finished_count++;
891 if (lj->lioj_count == lj->lioj_finished_count)
894 if (type == DONE_QUEUE) {
895 aiocbe->jobflags |= AIOCBLIST_DONE;
897 aiocbe->jobflags |= AIOCBLIST_BUFDONE;
899 TAILQ_INSERT_TAIL(&ki->kaio_done, aiocbe, plist);
900 aiocbe->jobstate = JOBST_JOBFINISHED;
902 if (ki->kaio_flags & KAIO_RUNDOWN)
903 goto notification_done;
905 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
906 aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID)
907 aio_sendsig(userp, &aiocbe->uaiocb.aio_sigevent, &aiocbe->ksi);
909 KNOTE_LOCKED(&aiocbe->klist, 1);
912 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
913 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
914 KNOTE_LOCKED(&lj->klist, 1);
916 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
918 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
919 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
920 aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi);
921 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
926 if (aiocbe->jobflags & AIOCBLIST_CHECKSYNC) {
927 TAILQ_FOREACH_SAFE(scb, &ki->kaio_syncqueue, list, scbn) {
928 if (aiocbe->fd_file == scb->fd_file &&
929 aiocbe->seqno < scb->seqno) {
930 if (--scb->pending == 0) {
931 mtx_lock(&aio_job_mtx);
932 scb->jobstate = JOBST_JOBQGLOBAL;
933 TAILQ_REMOVE(&ki->kaio_syncqueue, scb, list);
934 TAILQ_INSERT_TAIL(&aio_jobs, scb, list);
935 aio_kick_nowait(userp);
936 mtx_unlock(&aio_job_mtx);
941 if (ki->kaio_flags & KAIO_WAKEUP) {
942 ki->kaio_flags &= ~KAIO_WAKEUP;
943 wakeup(&userp->p_aioinfo);
948 * The AIO daemon, most of the actual work is done in aio_process,
949 * but the setup (and address space mgmt) is done in this routine.
952 aio_daemon(void *_id)
954 struct aiocblist *aiocbe;
955 struct aiothreadlist *aiop;
957 struct proc *curcp, *mycp, *userp;
958 struct vmspace *myvm, *tmpvm;
959 struct thread *td = curthread;
960 int id = (intptr_t)_id;
963 * Local copies of curproc (cp) and vmspace (myvm)
966 myvm = mycp->p_vmspace;
968 KASSERT(mycp->p_textvp == NULL, ("kthread has a textvp"));
971 * Allocate and ready the aio control info. There is one aiop structure
974 aiop = uma_zalloc(aiop_zone, M_WAITOK);
975 aiop->aiothread = td;
976 aiop->aiothreadflags = 0;
978 /* The daemon resides in its own pgrp. */
982 * Wakeup parent process. (Parent sleeps to keep from blasting away
983 * and creating too many daemons.)
985 sema_post(&aio_newproc_sem);
987 mtx_lock(&aio_job_mtx);
990 * curcp is the current daemon process context.
991 * userp is the current user process context.
996 * Take daemon off of free queue
998 if (aiop->aiothreadflags & AIOP_FREE) {
999 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1000 aiop->aiothreadflags &= ~AIOP_FREE;
1006 while ((aiocbe = aio_selectjob(aiop)) != NULL) {
1007 mtx_unlock(&aio_job_mtx);
1008 userp = aiocbe->userproc;
1011 * Connect to process address space for user program.
1013 if (userp != curcp) {
1015 * Save the current address space that we are
1018 tmpvm = mycp->p_vmspace;
1021 * Point to the new user address space, and
1024 mycp->p_vmspace = userp->p_vmspace;
1025 atomic_add_int(&mycp->p_vmspace->vm_refcnt, 1);
1027 /* Activate the new mapping. */
1028 pmap_activate(FIRST_THREAD_IN_PROC(mycp));
1031 * If the old address space wasn't the daemons
1032 * own address space, then we need to remove the
1033 * daemon's reference from the other process
1034 * that it was acting on behalf of.
1036 if (tmpvm != myvm) {
1037 vmspace_free(tmpvm);
1042 ki = userp->p_aioinfo;
1044 /* Do the I/O function. */
1045 aio_process(aiocbe);
1047 mtx_lock(&aio_job_mtx);
1048 /* Decrement the active job count. */
1049 ki->kaio_active_count--;
1050 mtx_unlock(&aio_job_mtx);
1053 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
1054 aio_bio_done_notify(userp, aiocbe, DONE_QUEUE);
1057 mtx_lock(&aio_job_mtx);
1061 * Disconnect from user address space.
1063 if (curcp != mycp) {
1065 mtx_unlock(&aio_job_mtx);
1067 /* Get the user address space to disconnect from. */
1068 tmpvm = mycp->p_vmspace;
1070 /* Get original address space for daemon. */
1071 mycp->p_vmspace = myvm;
1073 /* Activate the daemon's address space. */
1074 pmap_activate(FIRST_THREAD_IN_PROC(mycp));
1076 if (tmpvm == myvm) {
1077 printf("AIOD: vmspace problem -- %d\n",
1081 /* Remove our vmspace reference. */
1082 vmspace_free(tmpvm);
1086 mtx_lock(&aio_job_mtx);
1088 * We have to restart to avoid race, we only sleep if
1089 * no job can be selected, that should be
1095 mtx_assert(&aio_job_mtx, MA_OWNED);
1097 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
1098 aiop->aiothreadflags |= AIOP_FREE;
1101 * If daemon is inactive for a long time, allow it to exit,
1102 * thereby freeing resources.
1104 if (msleep(aiop->aiothread, &aio_job_mtx, PRIBIO, "aiordy",
1106 if (TAILQ_EMPTY(&aio_jobs)) {
1107 if ((aiop->aiothreadflags & AIOP_FREE) &&
1108 (num_aio_procs > target_aio_procs)) {
1109 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1111 mtx_unlock(&aio_job_mtx);
1112 uma_zfree(aiop_zone, aiop);
1113 free_unr(aiod_unr, id);
1115 if (mycp->p_vmspace->vm_refcnt <= 1) {
1116 printf("AIOD: bad vm refcnt for"
1117 " exiting daemon: %d\n",
1118 mycp->p_vmspace->vm_refcnt);
1126 mtx_unlock(&aio_job_mtx);
1127 panic("shouldn't be here\n");
1131 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
1132 * AIO daemon modifies its environment itself.
1135 aio_newproc(int *start)
1141 id = alloc_unr(aiod_unr);
1142 error = kthread_create(aio_daemon, (void *)(intptr_t)id, &p,
1143 RFNOWAIT, 0, "aiod%d", id);
1146 * Wait until daemon is started.
1148 sema_wait(&aio_newproc_sem);
1149 mtx_lock(&aio_job_mtx);
1153 mtx_unlock(&aio_job_mtx);
1155 free_unr(aiod_unr, id);
1161 * Try the high-performance, low-overhead physio method for eligible
1162 * VCHR devices. This method doesn't use an aio helper thread, and
1163 * thus has very low overhead.
1165 * Assumes that the caller, aio_aqueue(), has incremented the file
1166 * structure's reference count, preventing its deallocation for the
1167 * duration of this call.
1170 aio_qphysio(struct proc *p, struct aiocblist *aiocbe)
1176 struct kaioinfo *ki;
1177 struct aioliojob *lj;
1180 cb = &aiocbe->uaiocb;
1181 fp = aiocbe->fd_file;
1183 if (fp->f_type != DTYPE_VNODE)
1189 * If its not a disk, we don't want to return a positive error.
1190 * It causes the aio code to not fall through to try the thread
1191 * way when you're talking to a regular file.
1193 if (!vn_isdisk(vp, &error)) {
1194 if (error == ENOTBLK)
1200 if (vp->v_bufobj.bo_bsize == 0)
1203 if (cb->aio_nbytes % vp->v_bufobj.bo_bsize)
1206 if (cb->aio_nbytes > vp->v_rdev->si_iosize_max)
1209 if (cb->aio_nbytes >
1210 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK))
1214 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count)
1217 /* Create and build a buffer header for a transfer. */
1218 bp = (struct buf *)getpbuf(NULL);
1223 ki->kaio_buffer_count++;
1230 * Get a copy of the kva from the physical buffer.
1234 bp->b_bcount = cb->aio_nbytes;
1235 bp->b_bufsize = cb->aio_nbytes;
1236 bp->b_iodone = aio_physwakeup;
1237 bp->b_saveaddr = bp->b_data;
1238 bp->b_data = (void *)(uintptr_t)cb->aio_buf;
1239 bp->b_offset = cb->aio_offset;
1240 bp->b_iooffset = cb->aio_offset;
1241 bp->b_blkno = btodb(cb->aio_offset);
1242 bp->b_iocmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ;
1245 * Bring buffer into kernel space.
1247 if (vmapbuf(bp) < 0) {
1254 bp->b_caller1 = (void *)aiocbe;
1255 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist);
1256 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
1257 aiocbe->jobstate = JOBST_JOBQBUF;
1258 cb->_aiocb_private.status = cb->aio_nbytes;
1261 atomic_add_int(&num_queue_count, 1);
1262 atomic_add_int(&num_buf_aio, 1);
1266 TASK_INIT(&aiocbe->biotask, 0, biohelper, aiocbe);
1268 /* Perform transfer. */
1269 dev_strategy(vp->v_rdev, bp);
1275 ki->kaio_buffer_count--;
1285 * Wake up aio requests that may be serviceable now.
1288 aio_swake_cb(struct socket *so, struct sockbuf *sb)
1290 struct aiocblist *cb, *cbn;
1293 if (sb == &so->so_snd)
1299 sb->sb_flags &= ~SB_AIO;
1300 mtx_lock(&aio_job_mtx);
1301 TAILQ_FOREACH_SAFE(cb, &so->so_aiojobq, list, cbn) {
1302 if (opcode == cb->uaiocb.aio_lio_opcode) {
1303 if (cb->jobstate != JOBST_JOBQSOCK)
1304 panic("invalid queue value");
1306 * We don't have actual sockets backend yet,
1307 * so we simply move the requests to the generic
1310 TAILQ_REMOVE(&so->so_aiojobq, cb, list);
1311 TAILQ_INSERT_TAIL(&aio_jobs, cb, list);
1312 aio_kick_nowait(cb->userproc);
1315 mtx_unlock(&aio_job_mtx);
1320 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR
1321 * technique is done in this code.
1324 aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
1325 int type, int oldsigev)
1327 struct proc *p = td->td_proc;
1330 struct aiocblist *aiocbe, *cb;
1331 struct kaioinfo *ki;
1339 if (p->p_aioinfo == NULL)
1340 aio_init_aioinfo(p);
1344 suword(&job->_aiocb_private.status, -1);
1345 suword(&job->_aiocb_private.error, 0);
1346 suword(&job->_aiocb_private.kernelinfo, -1);
1348 if (num_queue_count >= max_queue_count ||
1349 ki->kaio_count >= ki->kaio_qallowed_count) {
1350 suword(&job->_aiocb_private.error, EAGAIN);
1354 aiocbe = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO);
1355 aiocbe->inputcharge = 0;
1356 aiocbe->outputcharge = 0;
1357 knlist_init(&aiocbe->klist, AIO_MTX(ki), NULL, NULL, NULL);
1360 bzero(&aiocbe->uaiocb, sizeof(struct aiocb));
1361 error = copyin(job, &aiocbe->uaiocb, sizeof(struct oaiocb));
1362 bcopy(&aiocbe->uaiocb.__spare__, &aiocbe->uaiocb.aio_sigevent,
1363 sizeof(struct osigevent));
1365 error = copyin(job, &aiocbe->uaiocb, sizeof(struct aiocb));
1368 suword(&job->_aiocb_private.error, error);
1369 uma_zfree(aiocb_zone, aiocbe);
1373 if (aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT &&
1374 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL &&
1375 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID &&
1376 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) {
1377 suword(&job->_aiocb_private.error, EINVAL);
1378 uma_zfree(aiocb_zone, aiocbe);
1382 if ((aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
1383 aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) &&
1384 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) {
1385 uma_zfree(aiocb_zone, aiocbe);
1389 ksiginfo_init(&aiocbe->ksi);
1391 /* Save userspace address of the job info. */
1392 aiocbe->uuaiocb = job;
1394 /* Get the opcode. */
1395 if (type != LIO_NOP)
1396 aiocbe->uaiocb.aio_lio_opcode = type;
1397 opcode = aiocbe->uaiocb.aio_lio_opcode;
1399 /* Fetch the file object for the specified file descriptor. */
1400 fd = aiocbe->uaiocb.aio_fildes;
1403 error = fget_write(td, fd, &fp);
1406 error = fget_read(td, fd, &fp);
1409 error = fget(td, fd, &fp);
1412 uma_zfree(aiocb_zone, aiocbe);
1413 suword(&job->_aiocb_private.error, error);
1417 if (opcode == LIO_SYNC && fp->f_vnode == NULL) {
1422 if (opcode != LIO_SYNC && aiocbe->uaiocb.aio_offset == -1LL) {
1427 aiocbe->fd_file = fp;
1429 mtx_lock(&aio_job_mtx);
1431 aiocbe->seqno = jobseqno++;
1432 mtx_unlock(&aio_job_mtx);
1433 error = suword(&job->_aiocb_private.kernelinfo, jid);
1438 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid;
1440 if (opcode == LIO_NOP) {
1442 uma_zfree(aiocb_zone, aiocbe);
1445 if ((opcode != LIO_READ) && (opcode != LIO_WRITE) &&
1446 (opcode != LIO_SYNC)) {
1451 if (aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT)
1453 kqfd = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue;
1454 kev.ident = (uintptr_t)aiocbe->uuaiocb;
1455 kev.filter = EVFILT_AIO;
1456 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
1457 kev.data = (intptr_t)aiocbe;
1458 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sival_ptr;
1459 error = kqfd_register(kqfd, &kev, td, 1);
1463 uma_zfree(aiocb_zone, aiocbe);
1464 suword(&job->_aiocb_private.error, error);
1469 suword(&job->_aiocb_private.error, EINPROGRESS);
1470 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS;
1471 aiocbe->userproc = p;
1472 aiocbe->cred = crhold(td->td_ucred);
1473 aiocbe->jobflags = 0;
1476 if (opcode == LIO_SYNC)
1479 if (fp->f_type == DTYPE_SOCKET) {
1481 * Alternate queueing for socket ops: Reach down into the
1482 * descriptor to get the socket data. Then check to see if the
1483 * socket is ready to be read or written (based on the requested
1486 * If it is not ready for io, then queue the aiocbe on the
1487 * socket, and set the flags so we get a call when sbnotify()
1490 * Note if opcode is neither LIO_WRITE nor LIO_READ we lock
1491 * and unlock the snd sockbuf for no reason.
1494 sb = (opcode == LIO_READ) ? &so->so_rcv : &so->so_snd;
1496 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode ==
1497 LIO_WRITE) && (!sowriteable(so)))) {
1498 sb->sb_flags |= SB_AIO;
1500 mtx_lock(&aio_job_mtx);
1501 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list);
1502 mtx_unlock(&aio_job_mtx);
1505 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
1506 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
1507 aiocbe->jobstate = JOBST_JOBQSOCK;
1513 atomic_add_int(&num_queue_count, 1);
1520 if ((error = aio_qphysio(p, aiocbe)) == 0)
1524 aiocbe->uaiocb._aiocb_private.error = error;
1525 suword(&job->_aiocb_private.error, error);
1530 /* No buffer for daemon I/O. */
1532 atomic_add_int(&num_queue_count, 1);
1538 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
1539 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
1540 if (opcode == LIO_SYNC) {
1541 TAILQ_FOREACH(cb, &ki->kaio_jobqueue, plist) {
1542 if (cb->fd_file == aiocbe->fd_file &&
1543 cb->uaiocb.aio_lio_opcode != LIO_SYNC &&
1544 cb->seqno < aiocbe->seqno) {
1545 cb->jobflags |= AIOCBLIST_CHECKSYNC;
1549 TAILQ_FOREACH(cb, &ki->kaio_bufqueue, plist) {
1550 if (cb->fd_file == aiocbe->fd_file &&
1551 cb->uaiocb.aio_lio_opcode != LIO_SYNC &&
1552 cb->seqno < aiocbe->seqno) {
1553 cb->jobflags |= AIOCBLIST_CHECKSYNC;
1557 if (aiocbe->pending != 0) {
1558 TAILQ_INSERT_TAIL(&ki->kaio_syncqueue, aiocbe, list);
1559 aiocbe->jobstate = JOBST_JOBQSYNC;
1564 mtx_lock(&aio_job_mtx);
1565 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
1566 aiocbe->jobstate = JOBST_JOBQGLOBAL;
1568 mtx_unlock(&aio_job_mtx);
1576 aio_kick_nowait(struct proc *userp)
1578 struct kaioinfo *ki = userp->p_aioinfo;
1579 struct aiothreadlist *aiop;
1581 mtx_assert(&aio_job_mtx, MA_OWNED);
1582 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1583 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1584 aiop->aiothreadflags &= ~AIOP_FREE;
1585 wakeup(aiop->aiothread);
1586 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
1587 ((ki->kaio_active_count + num_aio_resv_start) <
1588 ki->kaio_maxactive_count)) {
1589 taskqueue_enqueue(taskqueue_aiod_bio, &ki->kaio_task);
1594 aio_kick(struct proc *userp)
1596 struct kaioinfo *ki = userp->p_aioinfo;
1597 struct aiothreadlist *aiop;
1600 mtx_assert(&aio_job_mtx, MA_OWNED);
1602 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
1603 TAILQ_REMOVE(&aio_freeproc, aiop, list);
1604 aiop->aiothreadflags &= ~AIOP_FREE;
1605 wakeup(aiop->aiothread);
1606 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
1607 ((ki->kaio_active_count + num_aio_resv_start) <
1608 ki->kaio_maxactive_count)) {
1609 num_aio_resv_start++;
1610 mtx_unlock(&aio_job_mtx);
1611 error = aio_newproc(&num_aio_resv_start);
1612 mtx_lock(&aio_job_mtx);
1614 num_aio_resv_start--;
1624 aio_kick_helper(void *context, int pending)
1626 struct proc *userp = context;
1628 mtx_lock(&aio_job_mtx);
1629 while (--pending >= 0) {
1630 if (aio_kick(userp))
1633 mtx_unlock(&aio_job_mtx);
1637 * Support the aio_return system call, as a side-effect, kernel resources are
1641 aio_return(struct thread *td, struct aio_return_args *uap)
1643 struct proc *p = td->td_proc;
1644 struct aiocblist *cb;
1645 struct aiocb *uaiocb;
1646 struct kaioinfo *ki;
1652 uaiocb = uap->aiocbp;
1654 TAILQ_FOREACH(cb, &ki->kaio_done, plist) {
1655 if (cb->uuaiocb == uaiocb)
1659 MPASS(cb->jobstate == JOBST_JOBFINISHED);
1660 status = cb->uaiocb._aiocb_private.status;
1661 error = cb->uaiocb._aiocb_private.error;
1662 td->td_retval[0] = status;
1663 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
1664 td->td_ru.ru_oublock += cb->outputcharge;
1665 cb->outputcharge = 0;
1666 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
1667 td->td_ru.ru_inblock += cb->inputcharge;
1668 cb->inputcharge = 0;
1672 suword(&uaiocb->_aiocb_private.error, error);
1673 suword(&uaiocb->_aiocb_private.status, status);
1682 * Allow a process to wakeup when any of the I/O requests are completed.
1685 aio_suspend(struct thread *td, struct aio_suspend_args *uap)
1687 struct proc *p = td->td_proc;
1690 struct aiocb *const *cbptr, *cbp;
1691 struct kaioinfo *ki;
1692 struct aiocblist *cb, *cbfirst;
1693 struct aiocb **ujoblist;
1699 if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX)
1704 /* Get timespec struct. */
1705 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
1708 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
1711 TIMESPEC_TO_TIMEVAL(&atv, &ts);
1712 if (itimerfix(&atv))
1714 timo = tvtohz(&atv);
1722 ujoblist = uma_zalloc(aiol_zone, M_WAITOK);
1723 cbptr = uap->aiocbp;
1725 for (i = 0; i < uap->nent; i++) {
1726 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
1729 ujoblist[njoblist] = cbp;
1733 if (njoblist == 0) {
1734 uma_zfree(aiol_zone, ujoblist);
1742 TAILQ_FOREACH(cb, &ki->kaio_all, allist) {
1743 for (i = 0; i < njoblist; i++) {
1744 if (cb->uuaiocb == ujoblist[i]) {
1745 if (cbfirst == NULL)
1747 if (cb->jobstate == JOBST_JOBFINISHED)
1752 /* All tasks were finished. */
1753 if (cbfirst == NULL)
1756 ki->kaio_flags |= KAIO_WAKEUP;
1757 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
1759 if (error == ERESTART)
1766 uma_zfree(aiol_zone, ujoblist);
1771 * aio_cancel cancels any non-physio aio operations not currently in
1775 aio_cancel(struct thread *td, struct aio_cancel_args *uap)
1777 struct proc *p = td->td_proc;
1778 struct kaioinfo *ki;
1779 struct aiocblist *cbe, *cbn;
1785 int notcancelled = 0;
1788 /* Lookup file object. */
1789 error = fget(td, uap->fd, &fp);
1797 if (fp->f_type == DTYPE_VNODE) {
1799 if (vn_isdisk(vp, &error)) {
1801 td->td_retval[0] = AIO_NOTCANCELED;
1807 TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) {
1808 if ((uap->fd == cbe->uaiocb.aio_fildes) &&
1809 ((uap->aiocbp == NULL) ||
1810 (uap->aiocbp == cbe->uuaiocb))) {
1813 mtx_lock(&aio_job_mtx);
1814 if (cbe->jobstate == JOBST_JOBQGLOBAL) {
1815 TAILQ_REMOVE(&aio_jobs, cbe, list);
1817 } else if (cbe->jobstate == JOBST_JOBQSOCK) {
1818 MPASS(fp->f_type == DTYPE_SOCKET);
1820 TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
1822 } else if (cbe->jobstate == JOBST_JOBQSYNC) {
1823 TAILQ_REMOVE(&ki->kaio_syncqueue, cbe, list);
1826 mtx_unlock(&aio_job_mtx);
1829 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
1830 cbe->uaiocb._aiocb_private.status = -1;
1831 cbe->uaiocb._aiocb_private.error = ECANCELED;
1832 aio_bio_done_notify(p, cbe, DONE_QUEUE);
1837 if (uap->aiocbp != NULL)
1846 if (uap->aiocbp != NULL) {
1848 td->td_retval[0] = AIO_CANCELED;
1854 td->td_retval[0] = AIO_NOTCANCELED;
1859 td->td_retval[0] = AIO_CANCELED;
1863 td->td_retval[0] = AIO_ALLDONE;
1869 * aio_error is implemented in the kernel level for compatibility purposes
1870 * only. For a user mode async implementation, it would be best to do it in
1871 * a userland subroutine.
1874 aio_error(struct thread *td, struct aio_error_args *uap)
1876 struct proc *p = td->td_proc;
1877 struct aiocblist *cb;
1878 struct kaioinfo *ki;
1883 td->td_retval[0] = EINVAL;
1888 TAILQ_FOREACH(cb, &ki->kaio_all, allist) {
1889 if (cb->uuaiocb == uap->aiocbp) {
1890 if (cb->jobstate == JOBST_JOBFINISHED)
1892 cb->uaiocb._aiocb_private.error;
1894 td->td_retval[0] = EINPROGRESS;
1902 * Hack for failure of aio_aqueue.
1904 status = fuword(&uap->aiocbp->_aiocb_private.status);
1906 td->td_retval[0] = fuword(&uap->aiocbp->_aiocb_private.error);
1910 td->td_retval[0] = EINVAL;
1914 /* syscall - asynchronous read from a file (REALTIME) */
1916 oaio_read(struct thread *td, struct oaio_read_args *uap)
1919 return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 1);
1923 aio_read(struct thread *td, struct aio_read_args *uap)
1926 return aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, 0);
1929 /* syscall - asynchronous write to a file (REALTIME) */
1931 oaio_write(struct thread *td, struct oaio_write_args *uap)
1934 return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 1);
1938 aio_write(struct thread *td, struct aio_write_args *uap)
1941 return aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, 0);
1944 /* syscall - list directed I/O (REALTIME) */
1946 olio_listio(struct thread *td, struct olio_listio_args *uap)
1948 return do_lio_listio(td, (struct lio_listio_args *)uap, 1);
1951 /* syscall - list directed I/O (REALTIME) */
1953 lio_listio(struct thread *td, struct lio_listio_args *uap)
1955 return do_lio_listio(td, uap, 0);
1959 do_lio_listio(struct thread *td, struct lio_listio_args *uap, int oldsigev)
1961 struct proc *p = td->td_proc;
1962 struct aiocb *iocb, * const *cbptr;
1963 struct kaioinfo *ki;
1964 struct aioliojob *lj;
1971 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
1975 if (nent < 0 || nent > AIO_LISTIO_MAX)
1978 if (p->p_aioinfo == NULL)
1979 aio_init_aioinfo(p);
1983 lj = uma_zalloc(aiolio_zone, M_WAITOK);
1986 lj->lioj_finished_count = 0;
1987 knlist_init(&lj->klist, AIO_MTX(ki), NULL, NULL, NULL);
1988 ksiginfo_init(&lj->lioj_ksi);
1993 if (uap->sig && (uap->mode == LIO_NOWAIT)) {
1994 bzero(&lj->lioj_signal, sizeof(&lj->lioj_signal));
1995 error = copyin(uap->sig, &lj->lioj_signal,
1996 oldsigev ? sizeof(struct osigevent) :
1997 sizeof(struct sigevent));
1999 uma_zfree(aiolio_zone, lj);
2003 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
2004 /* Assume only new style KEVENT */
2005 kev.filter = EVFILT_LIO;
2006 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
2007 kev.ident = (uintptr_t)uap->acb_list; /* something unique */
2008 kev.data = (intptr_t)lj;
2009 /* pass user defined sigval data */
2010 kev.udata = lj->lioj_signal.sigev_value.sival_ptr;
2011 error = kqfd_register(
2012 lj->lioj_signal.sigev_notify_kqueue, &kev, td, 1);
2014 uma_zfree(aiolio_zone, lj);
2017 } else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) {
2019 } else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
2020 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) {
2021 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
2022 uma_zfree(aiolio_zone, lj);
2025 lj->lioj_flags |= LIOJ_SIGNAL;
2027 uma_zfree(aiolio_zone, lj);
2033 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
2035 * Add extra aiocb count to avoid the lio to be freed
2036 * by other threads doing aio_waitcomplete or aio_return,
2037 * and prevent event from being sent until we have queued
2044 * Get pointers to the list of I/O requests.
2047 cbptr = uap->acb_list;
2048 for (i = 0; i < uap->nent; i++) {
2049 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
2050 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) {
2051 error = aio_aqueue(td, iocb, lj, LIO_NOP, oldsigev);
2059 if (uap->mode == LIO_WAIT) {
2060 while (lj->lioj_count - 1 != lj->lioj_finished_count) {
2061 ki->kaio_flags |= KAIO_WAKEUP;
2062 error = msleep(&p->p_aioinfo, AIO_MTX(ki),
2063 PRIBIO | PCATCH, "aiospn", 0);
2064 if (error == ERESTART)
2070 if (lj->lioj_count - 1 == lj->lioj_finished_count) {
2071 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
2072 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
2073 KNOTE_LOCKED(&lj->klist, 1);
2075 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
2077 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
2078 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
2079 aio_sendsig(p, &lj->lioj_signal,
2081 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
2086 if (lj->lioj_count == 0) {
2087 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
2088 knlist_delete(&lj->klist, curthread, 1);
2090 sigqueue_take(&lj->lioj_ksi);
2093 uma_zfree(aiolio_zone, lj);
2103 * Called from interrupt thread for physio, we should return as fast
2104 * as possible, so we schedule a biohelper task.
2107 aio_physwakeup(struct buf *bp)
2109 struct aiocblist *aiocbe;
2111 aiocbe = (struct aiocblist *)bp->b_caller1;
2112 taskqueue_enqueue(taskqueue_aiod_bio, &aiocbe->biotask);
2116 * Task routine to perform heavy tasks, process wakeup, and signals.
2119 biohelper(void *context, int pending)
2121 struct aiocblist *aiocbe = context;
2124 struct kaioinfo *ki;
2128 userp = aiocbe->userproc;
2129 ki = userp->p_aioinfo;
2131 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid;
2132 aiocbe->uaiocb._aiocb_private.error = 0;
2133 if (bp->b_ioflags & BIO_ERROR)
2134 aiocbe->uaiocb._aiocb_private.error = bp->b_error;
2135 nblks = btodb(aiocbe->uaiocb.aio_nbytes);
2136 if (aiocbe->uaiocb.aio_lio_opcode == LIO_WRITE)
2137 aiocbe->outputcharge += nblks;
2139 aiocbe->inputcharge += nblks;
2141 TAILQ_REMOVE(&userp->p_aioinfo->kaio_bufqueue, aiocbe, plist);
2142 ki->kaio_buffer_count--;
2143 aio_bio_done_notify(userp, aiocbe, DONE_BUF);
2146 /* Release mapping into kernel space. */
2149 atomic_subtract_int(&num_buf_aio, 1);
2152 /* syscall - wait for the next completion of an aio request */
2154 aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap)
2156 struct proc *p = td->td_proc;
2159 struct kaioinfo *ki;
2160 struct aiocblist *cb;
2161 struct aiocb *uuaiocb;
2162 int error, status, timo;
2164 suword(uap->aiocbp, (long)NULL);
2168 /* Get timespec struct. */
2169 error = copyin(uap->timeout, &ts, sizeof(ts));
2173 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000))
2176 TIMESPEC_TO_TIMEVAL(&atv, &ts);
2177 if (itimerfix(&atv))
2179 timo = tvtohz(&atv);
2182 if (p->p_aioinfo == NULL)
2183 aio_init_aioinfo(p);
2189 while ((cb = TAILQ_FIRST(&ki->kaio_done)) == NULL) {
2190 ki->kaio_flags |= KAIO_WAKEUP;
2191 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
2193 if (timo && error == ERESTART)
2200 MPASS(cb->jobstate == JOBST_JOBFINISHED);
2201 uuaiocb = cb->uuaiocb;
2202 status = cb->uaiocb._aiocb_private.status;
2203 error = cb->uaiocb._aiocb_private.error;
2204 td->td_retval[0] = status;
2205 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
2206 td->td_ru.ru_oublock += cb->outputcharge;
2207 cb->outputcharge = 0;
2208 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
2209 td->td_ru.ru_inblock += cb->inputcharge;
2210 cb->inputcharge = 0;
2214 suword(uap->aiocbp, (long)uuaiocb);
2215 suword(&uuaiocb->_aiocb_private.error, error);
2216 suword(&uuaiocb->_aiocb_private.status, status);
2224 aio_fsync(struct thread *td, struct aio_fsync_args *uap)
2226 struct proc *p = td->td_proc;
2227 struct kaioinfo *ki;
2229 if (uap->op != O_SYNC) /* XXX lack of O_DSYNC */
2233 aio_init_aioinfo(p);
2234 return aio_aqueue(td, uap->aiocbp, NULL, LIO_SYNC, 0);
2237 /* kqueue attach function */
2239 filt_aioattach(struct knote *kn)
2241 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2244 * The aiocbe pointer must be validated before using it, so
2245 * registration is restricted to the kernel; the user cannot
2248 if ((kn->kn_flags & EV_FLAG1) == 0)
2250 kn->kn_flags &= ~EV_FLAG1;
2252 knlist_add(&aiocbe->klist, kn, 0);
2257 /* kqueue detach function */
2259 filt_aiodetach(struct knote *kn)
2261 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2263 if (!knlist_empty(&aiocbe->klist))
2264 knlist_remove(&aiocbe->klist, kn, 0);
2267 /* kqueue filter function */
2270 filt_aio(struct knote *kn, long hint)
2272 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
2274 kn->kn_data = aiocbe->uaiocb._aiocb_private.error;
2275 if (aiocbe->jobstate != JOBST_JOBFINISHED)
2277 kn->kn_flags |= EV_EOF;
2281 /* kqueue attach function */
2283 filt_lioattach(struct knote *kn)
2285 struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata;
2288 * The aioliojob pointer must be validated before using it, so
2289 * registration is restricted to the kernel; the user cannot
2292 if ((kn->kn_flags & EV_FLAG1) == 0)
2294 kn->kn_flags &= ~EV_FLAG1;
2296 knlist_add(&lj->klist, kn, 0);
2301 /* kqueue detach function */
2303 filt_liodetach(struct knote *kn)
2305 struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata;
2307 if (!knlist_empty(&lj->klist))
2308 knlist_remove(&lj->klist, kn, 0);
2311 /* kqueue filter function */
2314 filt_lio(struct knote *kn, long hint)
2316 struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata;
2318 return (lj->lioj_flags & LIOJ_KEVENT_POSTED);