1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1997 John S. Dyson. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. John S. Dyson's name may not be used to endorse or promote products 12 * derived from this software without specific prior written permission. 13 * 14 * DISCLAIMER: This code isn't warranted to do anything useful. Anything 15 * bad that happens because of using this software isn't the responsibility 16 * of the author. This software is distributed AS-IS. 17 */ 18 19 /* 20 * This file contains support for the POSIX 1003.1B AIO/LIO facility. 21 */ 22 23 #include <sys/cdefs.h> 24 __FBSDID("$FreeBSD$"); 25 26 #include <sys/param.h> 27 #include <sys/systm.h> 28 #include <sys/malloc.h> 29 #include <sys/bio.h> 30 #include <sys/buf.h> 31 #include <sys/capsicum.h> 32 #include <sys/eventhandler.h> 33 #include <sys/sysproto.h> 34 #include <sys/filedesc.h> 35 #include <sys/kernel.h> 36 #include <sys/module.h> 37 #include <sys/kthread.h> 38 #include <sys/fcntl.h> 39 #include <sys/file.h> 40 #include <sys/limits.h> 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <sys/unistd.h> 44 #include <sys/posix4.h> 45 #include <sys/proc.h> 46 #include <sys/resourcevar.h> 47 #include <sys/signalvar.h> 48 #include <sys/syscallsubr.h> 49 #include <sys/protosw.h> 50 #include <sys/rwlock.h> 51 #include <sys/sema.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/syscall.h> 55 #include <sys/sysent.h> 56 #include <sys/sysctl.h> 57 #include <sys/syslog.h> 58 #include <sys/sx.h> 59 #include <sys/taskqueue.h> 60 #include <sys/vnode.h> 61 #include <sys/conf.h> 62 #include <sys/event.h> 63 #include <sys/mount.h> 64 #include <geom/geom.h> 65 66 #include <machine/atomic.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_page.h> 70 #include <vm/vm_extern.h> 71 #include <vm/pmap.h> 72 #include <vm/vm_map.h> 73 #include <vm/vm_object.h> 74 #include <vm/uma.h> 75 #include <sys/aio.h> 76 77 /* 78 * Counter for allocating reference ids to new jobs. Wrapped to 1 on 79 * overflow. (XXX will be removed soon.) 80 */ 81 static u_long jobrefid; 82 83 /* 84 * Counter for aio_fsync. 85 */ 86 static uint64_t jobseqno; 87 88 #ifndef MAX_AIO_PER_PROC 89 #define MAX_AIO_PER_PROC 32 90 #endif 91 92 #ifndef MAX_AIO_QUEUE_PER_PROC 93 #define MAX_AIO_QUEUE_PER_PROC 256 94 #endif 95 96 #ifndef MAX_AIO_QUEUE 97 #define MAX_AIO_QUEUE 1024 /* Bigger than MAX_AIO_QUEUE_PER_PROC */ 98 #endif 99 100 #ifndef MAX_BUF_AIO 101 #define MAX_BUF_AIO 16 102 #endif 103 104 FEATURE(aio, "Asynchronous I/O"); 105 SYSCTL_DECL(_p1003_1b); 106 107 static MALLOC_DEFINE(M_LIO, "lio", "listio aio control block list"); 108 static MALLOC_DEFINE(M_AIOS, "aios", "aio_suspend aio control block list"); 109 110 static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 111 "Async IO management"); 112 113 static int enable_aio_unsafe = 0; 114 SYSCTL_INT(_vfs_aio, OID_AUTO, enable_unsafe, CTLFLAG_RW, &enable_aio_unsafe, 0, 115 "Permit asynchronous IO on all file types, not just known-safe types"); 116 117 static unsigned int unsafe_warningcnt = 1; 118 SYSCTL_UINT(_vfs_aio, OID_AUTO, unsafe_warningcnt, CTLFLAG_RW, 119 &unsafe_warningcnt, 0, 120 "Warnings that will be triggered upon failed IO requests on unsafe files"); 121 122 static int max_aio_procs = MAX_AIO_PROCS; 123 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, CTLFLAG_RW, &max_aio_procs, 0, 124 "Maximum number of kernel processes to use for handling async IO "); 125 126 static int num_aio_procs = 0; 127 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, CTLFLAG_RD, &num_aio_procs, 0, 128 "Number of presently active kernel processes for async IO"); 129 130 /* 131 * The code will adjust the actual number of AIO processes towards this 132 * number when it gets a chance. 133 */ 134 static int target_aio_procs = TARGET_AIO_PROCS; 135 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 136 0, 137 "Preferred number of ready kernel processes for async IO"); 138 139 static int max_queue_count = MAX_AIO_QUEUE; 140 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, 141 "Maximum number of aio requests to queue, globally"); 142 143 static int num_queue_count = 0; 144 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, 145 "Number of queued aio requests"); 146 147 static int num_buf_aio = 0; 148 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, 149 "Number of aio requests presently handled by the buf subsystem"); 150 151 static int num_unmapped_aio = 0; 152 SYSCTL_INT(_vfs_aio, OID_AUTO, num_unmapped_aio, CTLFLAG_RD, &num_unmapped_aio, 153 0, 154 "Number of aio requests presently handled by unmapped I/O buffers"); 155 156 /* Number of async I/O processes in the process of being started */ 157 /* XXX This should be local to aio_aqueue() */ 158 static int num_aio_resv_start = 0; 159 160 static int aiod_lifetime; 161 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, 162 "Maximum lifetime for idle aiod"); 163 164 static int max_aio_per_proc = MAX_AIO_PER_PROC; 165 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 166 0, 167 "Maximum active aio requests per process"); 168 169 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; 170 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, 171 &max_aio_queue_per_proc, 0, 172 "Maximum queued aio requests per process"); 173 174 static int max_buf_aio = MAX_BUF_AIO; 175 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, 176 "Maximum buf aio requests per process"); 177 178 /* 179 * Though redundant with vfs.aio.max_aio_queue_per_proc, POSIX requires 180 * sysconf(3) to support AIO_LISTIO_MAX, and we implement that with 181 * vfs.aio.aio_listio_max. 182 */ 183 SYSCTL_INT(_p1003_1b, CTL_P1003_1B_AIO_LISTIO_MAX, aio_listio_max, 184 CTLFLAG_RD | CTLFLAG_CAPRD, &max_aio_queue_per_proc, 185 0, "Maximum aio requests for a single lio_listio call"); 186 187 #ifdef COMPAT_FREEBSD6 188 typedef struct oaiocb { 189 int aio_fildes; /* File descriptor */ 190 off_t aio_offset; /* File offset for I/O */ 191 volatile void *aio_buf; /* I/O buffer in process space */ 192 size_t aio_nbytes; /* Number of bytes for I/O */ 193 struct osigevent aio_sigevent; /* Signal to deliver */ 194 int aio_lio_opcode; /* LIO opcode */ 195 int aio_reqprio; /* Request priority -- ignored */ 196 struct __aiocb_private _aiocb_private; 197 } oaiocb_t; 198 #endif 199 200 /* 201 * Below is a key of locks used to protect each member of struct kaiocb 202 * aioliojob and kaioinfo and any backends. 203 * 204 * * - need not protected 205 * a - locked by kaioinfo lock 206 * b - locked by backend lock, the backend lock can be null in some cases, 207 * for example, BIO belongs to this type, in this case, proc lock is 208 * reused. 209 * c - locked by aio_job_mtx, the lock for the generic file I/O backend. 210 */ 211 212 /* 213 * If the routine that services an AIO request blocks while running in an 214 * AIO kernel process it can starve other I/O requests. BIO requests 215 * queued via aio_qbio() complete asynchronously and do not use AIO kernel 216 * processes at all. Socket I/O requests use a separate pool of 217 * kprocs and also force non-blocking I/O. Other file I/O requests 218 * use the generic fo_read/fo_write operations which can block. The 219 * fsync and mlock operations can also block while executing. Ideally 220 * none of these requests would block while executing. 221 * 222 * Note that the service routines cannot toggle O_NONBLOCK in the file 223 * structure directly while handling a request due to races with 224 * userland threads. 225 */ 226 227 /* jobflags */ 228 #define KAIOCB_QUEUEING 0x01 229 #define KAIOCB_CANCELLED 0x02 230 #define KAIOCB_CANCELLING 0x04 231 #define KAIOCB_CHECKSYNC 0x08 232 #define KAIOCB_CLEARED 0x10 233 #define KAIOCB_FINISHED 0x20 234 235 /* 236 * AIO process info 237 */ 238 #define AIOP_FREE 0x1 /* proc on free queue */ 239 240 struct aioproc { 241 int aioprocflags; /* (c) AIO proc flags */ 242 TAILQ_ENTRY(aioproc) list; /* (c) list of processes */ 243 struct proc *aioproc; /* (*) the AIO proc */ 244 }; 245 246 /* 247 * data-structure for lio signal management 248 */ 249 struct aioliojob { 250 int lioj_flags; /* (a) listio flags */ 251 int lioj_count; /* (a) 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 * aiop async io process data 344 * aiocb async io jobs 345 * aiolio list io jobs 346 */ 347 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiolio_zone; 348 349 /* kqueue filters for aio */ 350 static struct filterops aio_filtops = { 351 .f_isfd = 0, 352 .f_attach = filt_aioattach, 353 .f_detach = filt_aiodetach, 354 .f_event = filt_aio, 355 }; 356 static struct filterops lio_filtops = { 357 .f_isfd = 0, 358 .f_attach = filt_lioattach, 359 .f_detach = filt_liodetach, 360 .f_event = filt_lio 361 }; 362 363 static eventhandler_tag exit_tag, exec_tag; 364 365 TASKQUEUE_DEFINE_THREAD(aiod_kick); 366 367 /* 368 * Main operations function for use as a kernel module. 369 */ 370 static int 371 aio_modload(struct module *module, int cmd, void *arg) 372 { 373 int error = 0; 374 375 switch (cmd) { 376 case MOD_LOAD: 377 aio_onceonly(); 378 break; 379 case MOD_SHUTDOWN: 380 break; 381 default: 382 error = EOPNOTSUPP; 383 break; 384 } 385 return (error); 386 } 387 388 static moduledata_t aio_mod = { 389 "aio", 390 &aio_modload, 391 NULL 392 }; 393 394 DECLARE_MODULE(aio, aio_mod, SI_SUB_VFS, SI_ORDER_ANY); 395 MODULE_VERSION(aio, 1); 396 397 /* 398 * Startup initialization 399 */ 400 static int 401 aio_onceonly(void) 402 { 403 404 exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL, 405 EVENTHANDLER_PRI_ANY); 406 exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown_exec, 407 NULL, EVENTHANDLER_PRI_ANY); 408 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops); 409 kqueue_add_filteropts(EVFILT_LIO, &lio_filtops); 410 TAILQ_INIT(&aio_freeproc); 411 sema_init(&aio_newproc_sem, 0, "aio_new_proc"); 412 mtx_init(&aio_job_mtx, "aio_job", NULL, MTX_DEF); 413 TAILQ_INIT(&aio_jobs); 414 aiod_unr = new_unrhdr(1, INT_MAX, NULL); 415 kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL, 416 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 417 aiop_zone = uma_zcreate("AIOP", sizeof(struct aioproc), NULL, 418 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 419 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct kaiocb), NULL, NULL, 420 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 421 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL, 422 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 423 aiod_lifetime = AIOD_LIFETIME_DEFAULT; 424 jobrefid = 1; 425 p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, _POSIX_ASYNCHRONOUS_IO); 426 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE); 427 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0); 428 429 return (0); 430 } 431 432 /* 433 * Init the per-process aioinfo structure. The aioinfo limits are set 434 * per-process for user limit (resource) management. 435 */ 436 void 437 aio_init_aioinfo(struct proc *p) 438 { 439 struct kaioinfo *ki; 440 441 ki = uma_zalloc(kaio_zone, M_WAITOK); 442 mtx_init(&ki->kaio_mtx, "aiomtx", NULL, MTX_DEF | MTX_NEW); 443 ki->kaio_flags = 0; 444 ki->kaio_active_count = 0; 445 ki->kaio_count = 0; 446 ki->kaio_buffer_count = 0; 447 TAILQ_INIT(&ki->kaio_all); 448 TAILQ_INIT(&ki->kaio_done); 449 TAILQ_INIT(&ki->kaio_jobqueue); 450 TAILQ_INIT(&ki->kaio_liojoblist); 451 TAILQ_INIT(&ki->kaio_syncqueue); 452 TAILQ_INIT(&ki->kaio_syncready); 453 TASK_INIT(&ki->kaio_task, 0, aio_kick_helper, p); 454 TASK_INIT(&ki->kaio_sync_task, 0, aio_schedule_fsync, ki); 455 PROC_LOCK(p); 456 if (p->p_aioinfo == NULL) { 457 p->p_aioinfo = ki; 458 PROC_UNLOCK(p); 459 } else { 460 PROC_UNLOCK(p); 461 mtx_destroy(&ki->kaio_mtx); 462 uma_zfree(kaio_zone, ki); 463 } 464 465 while (num_aio_procs < MIN(target_aio_procs, max_aio_procs)) 466 aio_newproc(NULL); 467 } 468 469 static int 470 aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi, bool ext) 471 { 472 struct thread *td; 473 int error; 474 475 error = sigev_findtd(p, sigev, &td); 476 if (error) 477 return (error); 478 if (!KSI_ONQ(ksi)) { 479 ksiginfo_set_sigev(ksi, sigev); 480 ksi->ksi_code = SI_ASYNCIO; 481 ksi->ksi_flags |= ext ? (KSI_EXT | KSI_INS) : 0; 482 tdsendsignal(p, td, ksi->ksi_signo, ksi); 483 } 484 PROC_UNLOCK(p); 485 return (error); 486 } 487 488 /* 489 * Free a job entry. Wait for completion if it is currently active, but don't 490 * delay forever. If we delay, we return a flag that says that we have to 491 * restart the queue scan. 492 */ 493 static int 494 aio_free_entry(struct kaiocb *job) 495 { 496 struct kaioinfo *ki; 497 struct aioliojob *lj; 498 struct proc *p; 499 500 p = job->userproc; 501 MPASS(curproc == p); 502 ki = p->p_aioinfo; 503 MPASS(ki != NULL); 504 505 AIO_LOCK_ASSERT(ki, MA_OWNED); 506 MPASS(job->jobflags & KAIOCB_FINISHED); 507 508 atomic_subtract_int(&num_queue_count, 1); 509 510 ki->kaio_count--; 511 MPASS(ki->kaio_count >= 0); 512 513 TAILQ_REMOVE(&ki->kaio_done, job, plist); 514 TAILQ_REMOVE(&ki->kaio_all, job, allist); 515 516 lj = job->lio; 517 if (lj) { 518 lj->lioj_count--; 519 lj->lioj_finished_count--; 520 521 if (lj->lioj_count == 0) { 522 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 523 /* lio is going away, we need to destroy any knotes */ 524 knlist_delete(&lj->klist, curthread, 1); 525 PROC_LOCK(p); 526 sigqueue_take(&lj->lioj_ksi); 527 PROC_UNLOCK(p); 528 uma_zfree(aiolio_zone, lj); 529 } 530 } 531 532 /* job is going away, we need to destroy any knotes */ 533 knlist_delete(&job->klist, curthread, 1); 534 PROC_LOCK(p); 535 sigqueue_take(&job->ksi); 536 PROC_UNLOCK(p); 537 538 AIO_UNLOCK(ki); 539 540 /* 541 * The thread argument here is used to find the owning process 542 * and is also passed to fo_close() which may pass it to various 543 * places such as devsw close() routines. Because of that, we 544 * need a thread pointer from the process owning the job that is 545 * persistent and won't disappear out from under us or move to 546 * another process. 547 * 548 * Currently, all the callers of this function call it to remove 549 * a kaiocb from the current process' job list either via a 550 * syscall or due to the current process calling exit() or 551 * execve(). Thus, we know that p == curproc. We also know that 552 * curthread can't exit since we are curthread. 553 * 554 * Therefore, we use curthread as the thread to pass to 555 * knlist_delete(). This does mean that it is possible for the 556 * thread pointer at close time to differ from the thread pointer 557 * at open time, but this is already true of file descriptors in 558 * a multithreaded process. 559 */ 560 if (job->fd_file) 561 fdrop(job->fd_file, curthread); 562 crfree(job->cred); 563 if (job->uiop != &job->uio) 564 free(job->uiop, M_IOV); 565 uma_zfree(aiocb_zone, job); 566 AIO_LOCK(ki); 567 568 return (0); 569 } 570 571 static void 572 aio_proc_rundown_exec(void *arg, struct proc *p, 573 struct image_params *imgp __unused) 574 { 575 aio_proc_rundown(arg, p); 576 } 577 578 static int 579 aio_cancel_job(struct proc *p, struct kaioinfo *ki, struct kaiocb *job) 580 { 581 aio_cancel_fn_t *func; 582 int cancelled; 583 584 AIO_LOCK_ASSERT(ki, MA_OWNED); 585 if (job->jobflags & (KAIOCB_CANCELLED | KAIOCB_FINISHED)) 586 return (0); 587 MPASS((job->jobflags & KAIOCB_CANCELLING) == 0); 588 job->jobflags |= KAIOCB_CANCELLED; 589 590 func = job->cancel_fn; 591 592 /* 593 * If there is no cancel routine, just leave the job marked as 594 * cancelled. The job should be in active use by a caller who 595 * should complete it normally or when it fails to install a 596 * cancel routine. 597 */ 598 if (func == NULL) 599 return (0); 600 601 /* 602 * Set the CANCELLING flag so that aio_complete() will defer 603 * completions of this job. This prevents the job from being 604 * freed out from under the cancel callback. After the 605 * callback any deferred completion (whether from the callback 606 * or any other source) will be completed. 607 */ 608 job->jobflags |= KAIOCB_CANCELLING; 609 AIO_UNLOCK(ki); 610 func(job); 611 AIO_LOCK(ki); 612 job->jobflags &= ~KAIOCB_CANCELLING; 613 if (job->jobflags & KAIOCB_FINISHED) { 614 cancelled = job->uaiocb._aiocb_private.error == ECANCELED; 615 TAILQ_REMOVE(&ki->kaio_jobqueue, job, plist); 616 aio_bio_done_notify(p, job); 617 } else { 618 /* 619 * The cancel callback might have scheduled an 620 * operation to cancel this request, but it is 621 * only counted as cancelled if the request is 622 * cancelled when the callback returns. 623 */ 624 cancelled = 0; 625 } 626 return (cancelled); 627 } 628 629 /* 630 * Rundown the jobs for a given process. 631 */ 632 static void 633 aio_proc_rundown(void *arg, struct proc *p) 634 { 635 struct kaioinfo *ki; 636 struct aioliojob *lj; 637 struct kaiocb *job, *jobn; 638 639 KASSERT(curthread->td_proc == p, 640 ("%s: called on non-curproc", __func__)); 641 ki = p->p_aioinfo; 642 if (ki == NULL) 643 return; 644 645 AIO_LOCK(ki); 646 ki->kaio_flags |= KAIO_RUNDOWN; 647 648 restart: 649 650 /* 651 * Try to cancel all pending requests. This code simulates 652 * aio_cancel on all pending I/O requests. 653 */ 654 TAILQ_FOREACH_SAFE(job, &ki->kaio_jobqueue, plist, jobn) { 655 aio_cancel_job(p, ki, job); 656 } 657 658 /* Wait for all running I/O to be finished */ 659 if (TAILQ_FIRST(&ki->kaio_jobqueue) || ki->kaio_active_count != 0) { 660 ki->kaio_flags |= KAIO_WAKEUP; 661 msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO, "aioprn", hz); 662 goto restart; 663 } 664 665 /* Free all completed I/O requests. */ 666 while ((job = TAILQ_FIRST(&ki->kaio_done)) != NULL) 667 aio_free_entry(job); 668 669 while ((lj = TAILQ_FIRST(&ki->kaio_liojoblist)) != NULL) { 670 if (lj->lioj_count == 0) { 671 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 672 knlist_delete(&lj->klist, curthread, 1); 673 PROC_LOCK(p); 674 sigqueue_take(&lj->lioj_ksi); 675 PROC_UNLOCK(p); 676 uma_zfree(aiolio_zone, lj); 677 } else { 678 panic("LIO job not cleaned up: C:%d, FC:%d\n", 679 lj->lioj_count, lj->lioj_finished_count); 680 } 681 } 682 AIO_UNLOCK(ki); 683 taskqueue_drain(taskqueue_aiod_kick, &ki->kaio_task); 684 taskqueue_drain(taskqueue_aiod_kick, &ki->kaio_sync_task); 685 mtx_destroy(&ki->kaio_mtx); 686 uma_zfree(kaio_zone, ki); 687 p->p_aioinfo = NULL; 688 } 689 690 /* 691 * Select a job to run (called by an AIO daemon). 692 */ 693 static struct kaiocb * 694 aio_selectjob(struct aioproc *aiop) 695 { 696 struct kaiocb *job; 697 struct kaioinfo *ki; 698 struct proc *userp; 699 700 mtx_assert(&aio_job_mtx, MA_OWNED); 701 restart: 702 TAILQ_FOREACH(job, &aio_jobs, list) { 703 userp = job->userproc; 704 ki = userp->p_aioinfo; 705 706 if (ki->kaio_active_count < max_aio_per_proc) { 707 TAILQ_REMOVE(&aio_jobs, job, list); 708 if (!aio_clear_cancel_function(job)) 709 goto restart; 710 711 /* Account for currently active jobs. */ 712 ki->kaio_active_count++; 713 break; 714 } 715 } 716 return (job); 717 } 718 719 /* 720 * Move all data to a permanent storage device. This code 721 * simulates the fsync and fdatasync syscalls. 722 */ 723 static int 724 aio_fsync_vnode(struct thread *td, struct vnode *vp, int op) 725 { 726 struct mount *mp; 727 vm_object_t obj; 728 int error; 729 730 for (;;) { 731 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 732 if (error != 0) 733 break; 734 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 735 obj = vp->v_object; 736 if (obj != NULL) { 737 VM_OBJECT_WLOCK(obj); 738 vm_object_page_clean(obj, 0, 0, 0); 739 VM_OBJECT_WUNLOCK(obj); 740 } 741 if (op == LIO_DSYNC) 742 error = VOP_FDATASYNC(vp, td); 743 else 744 error = VOP_FSYNC(vp, MNT_WAIT, td); 745 746 VOP_UNLOCK(vp); 747 vn_finished_write(mp); 748 if (error != ERELOOKUP) 749 break; 750 } 751 return (error); 752 } 753 754 /* 755 * The AIO processing activity for LIO_READ/LIO_WRITE. This is the code that 756 * does the I/O request for the non-bio version of the operations. The normal 757 * vn operations are used, and this code should work in all instances for every 758 * type of file, including pipes, sockets, fifos, and regular files. 759 * 760 * XXX I don't think it works well for socket, pipe, and fifo. 761 */ 762 static void 763 aio_process_rw(struct kaiocb *job) 764 { 765 struct ucred *td_savedcred; 766 struct thread *td; 767 struct aiocb *cb; 768 struct file *fp; 769 ssize_t cnt; 770 long msgsnd_st, msgsnd_end; 771 long msgrcv_st, msgrcv_end; 772 long oublock_st, oublock_end; 773 long inblock_st, inblock_end; 774 int error, opcode; 775 776 KASSERT(job->uaiocb.aio_lio_opcode == LIO_READ || 777 job->uaiocb.aio_lio_opcode == LIO_READV || 778 job->uaiocb.aio_lio_opcode == LIO_WRITE || 779 job->uaiocb.aio_lio_opcode == LIO_WRITEV, 780 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode)); 781 782 aio_switch_vmspace(job); 783 td = curthread; 784 td_savedcred = td->td_ucred; 785 td->td_ucred = job->cred; 786 job->uiop->uio_td = td; 787 cb = &job->uaiocb; 788 fp = job->fd_file; 789 790 opcode = job->uaiocb.aio_lio_opcode; 791 cnt = job->uiop->uio_resid; 792 793 msgrcv_st = td->td_ru.ru_msgrcv; 794 msgsnd_st = td->td_ru.ru_msgsnd; 795 inblock_st = td->td_ru.ru_inblock; 796 oublock_st = td->td_ru.ru_oublock; 797 798 /* 799 * aio_aqueue() acquires a reference to the file that is 800 * released in aio_free_entry(). 801 */ 802 if (opcode == LIO_READ || opcode == LIO_READV) { 803 if (job->uiop->uio_resid == 0) 804 error = 0; 805 else 806 error = fo_read(fp, job->uiop, fp->f_cred, FOF_OFFSET, 807 td); 808 } else { 809 if (fp->f_type == DTYPE_VNODE) 810 bwillwrite(); 811 error = fo_write(fp, job->uiop, fp->f_cred, FOF_OFFSET, td); 812 } 813 msgrcv_end = td->td_ru.ru_msgrcv; 814 msgsnd_end = td->td_ru.ru_msgsnd; 815 inblock_end = td->td_ru.ru_inblock; 816 oublock_end = td->td_ru.ru_oublock; 817 818 job->msgrcv = msgrcv_end - msgrcv_st; 819 job->msgsnd = msgsnd_end - msgsnd_st; 820 job->inblock = inblock_end - inblock_st; 821 job->outblock = oublock_end - oublock_st; 822 823 if (error != 0 && job->uiop->uio_resid != cnt) { 824 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) 825 error = 0; 826 if (error == EPIPE && (opcode & LIO_WRITE)) { 827 PROC_LOCK(job->userproc); 828 kern_psignal(job->userproc, SIGPIPE); 829 PROC_UNLOCK(job->userproc); 830 } 831 } 832 833 cnt -= job->uiop->uio_resid; 834 td->td_ucred = td_savedcred; 835 if (error) 836 aio_complete(job, -1, error); 837 else 838 aio_complete(job, cnt, 0); 839 } 840 841 static void 842 aio_process_sync(struct kaiocb *job) 843 { 844 struct thread *td = curthread; 845 struct ucred *td_savedcred = td->td_ucred; 846 struct file *fp = job->fd_file; 847 int error = 0; 848 849 KASSERT(job->uaiocb.aio_lio_opcode & LIO_SYNC, 850 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode)); 851 852 td->td_ucred = job->cred; 853 if (fp->f_vnode != NULL) { 854 error = aio_fsync_vnode(td, fp->f_vnode, 855 job->uaiocb.aio_lio_opcode); 856 } 857 td->td_ucred = td_savedcred; 858 if (error) 859 aio_complete(job, -1, error); 860 else 861 aio_complete(job, 0, 0); 862 } 863 864 static void 865 aio_process_mlock(struct kaiocb *job) 866 { 867 struct aiocb *cb = &job->uaiocb; 868 int error; 869 870 KASSERT(job->uaiocb.aio_lio_opcode == LIO_MLOCK, 871 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode)); 872 873 aio_switch_vmspace(job); 874 error = kern_mlock(job->userproc, job->cred, 875 __DEVOLATILE(uintptr_t, cb->aio_buf), cb->aio_nbytes); 876 aio_complete(job, error != 0 ? -1 : 0, error); 877 } 878 879 static void 880 aio_bio_done_notify(struct proc *userp, struct kaiocb *job) 881 { 882 struct aioliojob *lj; 883 struct kaioinfo *ki; 884 struct kaiocb *sjob, *sjobn; 885 int lj_done; 886 bool schedule_fsync; 887 888 ki = userp->p_aioinfo; 889 AIO_LOCK_ASSERT(ki, MA_OWNED); 890 lj = job->lio; 891 lj_done = 0; 892 if (lj) { 893 lj->lioj_finished_count++; 894 if (lj->lioj_count == lj->lioj_finished_count) 895 lj_done = 1; 896 } 897 TAILQ_INSERT_TAIL(&ki->kaio_done, job, plist); 898 MPASS(job->jobflags & KAIOCB_FINISHED); 899 900 if (ki->kaio_flags & KAIO_RUNDOWN) 901 goto notification_done; 902 903 if (job->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL || 904 job->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) 905 aio_sendsig(userp, &job->uaiocb.aio_sigevent, &job->ksi, true); 906 907 KNOTE_LOCKED(&job->klist, 1); 908 909 if (lj_done) { 910 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { 911 lj->lioj_flags |= LIOJ_KEVENT_POSTED; 912 KNOTE_LOCKED(&lj->klist, 1); 913 } 914 if ((lj->lioj_flags & (LIOJ_SIGNAL | LIOJ_SIGNAL_POSTED)) 915 == LIOJ_SIGNAL && 916 (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || 917 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) { 918 aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi, 919 true); 920 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 921 } 922 } 923 924 notification_done: 925 if (job->jobflags & KAIOCB_CHECKSYNC) { 926 schedule_fsync = false; 927 TAILQ_FOREACH_SAFE(sjob, &ki->kaio_syncqueue, list, sjobn) { 928 if (job->fd_file != sjob->fd_file || 929 job->seqno >= sjob->seqno) 930 continue; 931 if (--sjob->pending > 0) 932 continue; 933 TAILQ_REMOVE(&ki->kaio_syncqueue, sjob, list); 934 if (!aio_clear_cancel_function_locked(sjob)) 935 continue; 936 TAILQ_INSERT_TAIL(&ki->kaio_syncready, sjob, list); 937 schedule_fsync = true; 938 } 939 if (schedule_fsync) 940 taskqueue_enqueue(taskqueue_aiod_kick, 941 &ki->kaio_sync_task); 942 } 943 if (ki->kaio_flags & KAIO_WAKEUP) { 944 ki->kaio_flags &= ~KAIO_WAKEUP; 945 wakeup(&userp->p_aioinfo); 946 } 947 } 948 949 static void 950 aio_schedule_fsync(void *context, int pending) 951 { 952 struct kaioinfo *ki; 953 struct kaiocb *job; 954 955 ki = context; 956 AIO_LOCK(ki); 957 while (!TAILQ_EMPTY(&ki->kaio_syncready)) { 958 job = TAILQ_FIRST(&ki->kaio_syncready); 959 TAILQ_REMOVE(&ki->kaio_syncready, job, list); 960 AIO_UNLOCK(ki); 961 aio_schedule(job, aio_process_sync); 962 AIO_LOCK(ki); 963 } 964 AIO_UNLOCK(ki); 965 } 966 967 bool 968 aio_cancel_cleared(struct kaiocb *job) 969 { 970 971 /* 972 * The caller should hold the same queue lock held when 973 * aio_clear_cancel_function() was called and set this flag 974 * ensuring this check sees an up-to-date value. However, 975 * there is no way to assert that. 976 */ 977 return ((job->jobflags & KAIOCB_CLEARED) != 0); 978 } 979 980 static bool 981 aio_clear_cancel_function_locked(struct kaiocb *job) 982 { 983 984 AIO_LOCK_ASSERT(job->userproc->p_aioinfo, MA_OWNED); 985 MPASS(job->cancel_fn != NULL); 986 if (job->jobflags & KAIOCB_CANCELLING) { 987 job->jobflags |= KAIOCB_CLEARED; 988 return (false); 989 } 990 job->cancel_fn = NULL; 991 return (true); 992 } 993 994 bool 995 aio_clear_cancel_function(struct kaiocb *job) 996 { 997 struct kaioinfo *ki; 998 bool ret; 999 1000 ki = job->userproc->p_aioinfo; 1001 AIO_LOCK(ki); 1002 ret = aio_clear_cancel_function_locked(job); 1003 AIO_UNLOCK(ki); 1004 return (ret); 1005 } 1006 1007 static bool 1008 aio_set_cancel_function_locked(struct kaiocb *job, aio_cancel_fn_t *func) 1009 { 1010 1011 AIO_LOCK_ASSERT(job->userproc->p_aioinfo, MA_OWNED); 1012 if (job->jobflags & KAIOCB_CANCELLED) 1013 return (false); 1014 job->cancel_fn = func; 1015 return (true); 1016 } 1017 1018 bool 1019 aio_set_cancel_function(struct kaiocb *job, aio_cancel_fn_t *func) 1020 { 1021 struct kaioinfo *ki; 1022 bool ret; 1023 1024 ki = job->userproc->p_aioinfo; 1025 AIO_LOCK(ki); 1026 ret = aio_set_cancel_function_locked(job, func); 1027 AIO_UNLOCK(ki); 1028 return (ret); 1029 } 1030 1031 void 1032 aio_complete(struct kaiocb *job, long status, int error) 1033 { 1034 struct kaioinfo *ki; 1035 struct proc *userp; 1036 1037 job->uaiocb._aiocb_private.error = error; 1038 job->uaiocb._aiocb_private.status = status; 1039 1040 userp = job->userproc; 1041 ki = userp->p_aioinfo; 1042 1043 AIO_LOCK(ki); 1044 KASSERT(!(job->jobflags & KAIOCB_FINISHED), 1045 ("duplicate aio_complete")); 1046 job->jobflags |= KAIOCB_FINISHED; 1047 if ((job->jobflags & (KAIOCB_QUEUEING | KAIOCB_CANCELLING)) == 0) { 1048 TAILQ_REMOVE(&ki->kaio_jobqueue, job, plist); 1049 aio_bio_done_notify(userp, job); 1050 } 1051 AIO_UNLOCK(ki); 1052 } 1053 1054 void 1055 aio_cancel(struct kaiocb *job) 1056 { 1057 1058 aio_complete(job, -1, ECANCELED); 1059 } 1060 1061 void 1062 aio_switch_vmspace(struct kaiocb *job) 1063 { 1064 1065 vmspace_switch_aio(job->userproc->p_vmspace); 1066 } 1067 1068 /* 1069 * The AIO daemon, most of the actual work is done in aio_process_*, 1070 * but the setup (and address space mgmt) is done in this routine. 1071 */ 1072 static void 1073 aio_daemon(void *_id) 1074 { 1075 struct kaiocb *job; 1076 struct aioproc *aiop; 1077 struct kaioinfo *ki; 1078 struct proc *p; 1079 struct vmspace *myvm; 1080 struct thread *td = curthread; 1081 int id = (intptr_t)_id; 1082 1083 /* 1084 * Grab an extra reference on the daemon's vmspace so that it 1085 * doesn't get freed by jobs that switch to a different 1086 * vmspace. 1087 */ 1088 p = td->td_proc; 1089 myvm = vmspace_acquire_ref(p); 1090 1091 KASSERT(p->p_textvp == NULL, ("kthread has a textvp")); 1092 1093 /* 1094 * Allocate and ready the aio control info. There is one aiop structure 1095 * per daemon. 1096 */ 1097 aiop = uma_zalloc(aiop_zone, M_WAITOK); 1098 aiop->aioproc = p; 1099 aiop->aioprocflags = 0; 1100 1101 /* 1102 * Wakeup parent process. (Parent sleeps to keep from blasting away 1103 * and creating too many daemons.) 1104 */ 1105 sema_post(&aio_newproc_sem); 1106 1107 mtx_lock(&aio_job_mtx); 1108 for (;;) { 1109 /* 1110 * Take daemon off of free queue 1111 */ 1112 if (aiop->aioprocflags & AIOP_FREE) { 1113 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1114 aiop->aioprocflags &= ~AIOP_FREE; 1115 } 1116 1117 /* 1118 * Check for jobs. 1119 */ 1120 while ((job = aio_selectjob(aiop)) != NULL) { 1121 mtx_unlock(&aio_job_mtx); 1122 1123 ki = job->userproc->p_aioinfo; 1124 job->handle_fn(job); 1125 1126 mtx_lock(&aio_job_mtx); 1127 /* Decrement the active job count. */ 1128 ki->kaio_active_count--; 1129 } 1130 1131 /* 1132 * Disconnect from user address space. 1133 */ 1134 if (p->p_vmspace != myvm) { 1135 mtx_unlock(&aio_job_mtx); 1136 vmspace_switch_aio(myvm); 1137 mtx_lock(&aio_job_mtx); 1138 /* 1139 * We have to restart to avoid race, we only sleep if 1140 * no job can be selected. 1141 */ 1142 continue; 1143 } 1144 1145 mtx_assert(&aio_job_mtx, MA_OWNED); 1146 1147 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 1148 aiop->aioprocflags |= AIOP_FREE; 1149 1150 /* 1151 * If daemon is inactive for a long time, allow it to exit, 1152 * thereby freeing resources. 1153 */ 1154 if (msleep(p, &aio_job_mtx, PRIBIO, "aiordy", 1155 aiod_lifetime) == EWOULDBLOCK && TAILQ_EMPTY(&aio_jobs) && 1156 (aiop->aioprocflags & AIOP_FREE) && 1157 num_aio_procs > target_aio_procs) 1158 break; 1159 } 1160 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1161 num_aio_procs--; 1162 mtx_unlock(&aio_job_mtx); 1163 uma_zfree(aiop_zone, aiop); 1164 free_unr(aiod_unr, id); 1165 vmspace_free(myvm); 1166 1167 KASSERT(p->p_vmspace == myvm, 1168 ("AIOD: bad vmspace for exiting daemon")); 1169 KASSERT(refcount_load(&myvm->vm_refcnt) > 1, 1170 ("AIOD: bad vm refcnt for exiting daemon: %d", 1171 refcount_load(&myvm->vm_refcnt))); 1172 kproc_exit(0); 1173 } 1174 1175 /* 1176 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The 1177 * AIO daemon modifies its environment itself. 1178 */ 1179 static int 1180 aio_newproc(int *start) 1181 { 1182 int error; 1183 struct proc *p; 1184 int id; 1185 1186 id = alloc_unr(aiod_unr); 1187 error = kproc_create(aio_daemon, (void *)(intptr_t)id, &p, 1188 RFNOWAIT, 0, "aiod%d", id); 1189 if (error == 0) { 1190 /* 1191 * Wait until daemon is started. 1192 */ 1193 sema_wait(&aio_newproc_sem); 1194 mtx_lock(&aio_job_mtx); 1195 num_aio_procs++; 1196 if (start != NULL) 1197 (*start)--; 1198 mtx_unlock(&aio_job_mtx); 1199 } else { 1200 free_unr(aiod_unr, id); 1201 } 1202 return (error); 1203 } 1204 1205 /* 1206 * Try the high-performance, low-overhead bio method for eligible 1207 * VCHR devices. This method doesn't use an aio helper thread, and 1208 * thus has very low overhead. 1209 * 1210 * Assumes that the caller, aio_aqueue(), has incremented the file 1211 * structure's reference count, preventing its deallocation for the 1212 * duration of this call. 1213 */ 1214 static int 1215 aio_qbio(struct proc *p, struct kaiocb *job) 1216 { 1217 struct aiocb *cb; 1218 struct file *fp; 1219 struct buf *pbuf; 1220 struct vnode *vp; 1221 struct cdevsw *csw; 1222 struct cdev *dev; 1223 struct kaioinfo *ki; 1224 struct bio **bios = NULL; 1225 off_t offset; 1226 int bio_cmd, error, i, iovcnt, opcode, poff, ref; 1227 vm_prot_t prot; 1228 bool use_unmapped; 1229 1230 cb = &job->uaiocb; 1231 fp = job->fd_file; 1232 opcode = cb->aio_lio_opcode; 1233 1234 if (!(opcode == LIO_WRITE || opcode == LIO_WRITEV || 1235 opcode == LIO_READ || opcode == LIO_READV)) 1236 return (-1); 1237 if (fp == NULL || fp->f_type != DTYPE_VNODE) 1238 return (-1); 1239 1240 vp = fp->f_vnode; 1241 if (vp->v_type != VCHR) 1242 return (-1); 1243 if (vp->v_bufobj.bo_bsize == 0) 1244 return (-1); 1245 1246 bio_cmd = (opcode & LIO_WRITE) ? BIO_WRITE : BIO_READ; 1247 iovcnt = job->uiop->uio_iovcnt; 1248 if (iovcnt > max_buf_aio) 1249 return (-1); 1250 for (i = 0; i < iovcnt; i++) { 1251 if (job->uiop->uio_iov[i].iov_len % vp->v_bufobj.bo_bsize != 0) 1252 return (-1); 1253 if (job->uiop->uio_iov[i].iov_len > maxphys) { 1254 error = -1; 1255 return (-1); 1256 } 1257 } 1258 offset = cb->aio_offset; 1259 1260 ref = 0; 1261 csw = devvn_refthread(vp, &dev, &ref); 1262 if (csw == NULL) 1263 return (ENXIO); 1264 1265 if ((csw->d_flags & D_DISK) == 0) { 1266 error = -1; 1267 goto unref; 1268 } 1269 if (job->uiop->uio_resid > dev->si_iosize_max) { 1270 error = -1; 1271 goto unref; 1272 } 1273 1274 ki = p->p_aioinfo; 1275 job->error = 0; 1276 1277 use_unmapped = (dev->si_flags & SI_UNMAPPED) && unmapped_buf_allowed; 1278 if (!use_unmapped) { 1279 AIO_LOCK(ki); 1280 if (ki->kaio_buffer_count + iovcnt > max_buf_aio) { 1281 AIO_UNLOCK(ki); 1282 error = EAGAIN; 1283 goto unref; 1284 } 1285 ki->kaio_buffer_count += iovcnt; 1286 AIO_UNLOCK(ki); 1287 } 1288 1289 bios = malloc(sizeof(struct bio *) * iovcnt, M_TEMP, M_WAITOK); 1290 atomic_store_int(&job->nbio, iovcnt); 1291 for (i = 0; i < iovcnt; i++) { 1292 struct vm_page** pages; 1293 struct bio *bp; 1294 void *buf; 1295 size_t nbytes; 1296 int npages; 1297 1298 buf = job->uiop->uio_iov[i].iov_base; 1299 nbytes = job->uiop->uio_iov[i].iov_len; 1300 1301 bios[i] = g_alloc_bio(); 1302 bp = bios[i]; 1303 1304 poff = (vm_offset_t)buf & PAGE_MASK; 1305 if (use_unmapped) { 1306 pbuf = NULL; 1307 pages = malloc(sizeof(vm_page_t) * (atop(round_page( 1308 nbytes)) + 1), M_TEMP, M_WAITOK | M_ZERO); 1309 } else { 1310 pbuf = uma_zalloc(pbuf_zone, M_WAITOK); 1311 BUF_KERNPROC(pbuf); 1312 pages = pbuf->b_pages; 1313 } 1314 1315 bp->bio_length = nbytes; 1316 bp->bio_bcount = nbytes; 1317 bp->bio_done = aio_biowakeup; 1318 bp->bio_offset = offset; 1319 bp->bio_cmd = bio_cmd; 1320 bp->bio_dev = dev; 1321 bp->bio_caller1 = job; 1322 bp->bio_caller2 = pbuf; 1323 1324 prot = VM_PROT_READ; 1325 if (opcode == LIO_READ || opcode == LIO_READV) 1326 prot |= VM_PROT_WRITE; /* Less backwards than it looks */ 1327 npages = vm_fault_quick_hold_pages(&curproc->p_vmspace->vm_map, 1328 (vm_offset_t)buf, bp->bio_length, prot, pages, 1329 atop(maxphys) + 1); 1330 if (npages < 0) { 1331 if (pbuf != NULL) 1332 uma_zfree(pbuf_zone, pbuf); 1333 else 1334 free(pages, M_TEMP); 1335 error = EFAULT; 1336 g_destroy_bio(bp); 1337 i--; 1338 goto destroy_bios; 1339 } 1340 if (pbuf != NULL) { 1341 pmap_qenter((vm_offset_t)pbuf->b_data, pages, npages); 1342 bp->bio_data = pbuf->b_data + poff; 1343 pbuf->b_npages = npages; 1344 atomic_add_int(&num_buf_aio, 1); 1345 } else { 1346 bp->bio_ma = pages; 1347 bp->bio_ma_n = npages; 1348 bp->bio_ma_offset = poff; 1349 bp->bio_data = unmapped_buf; 1350 bp->bio_flags |= BIO_UNMAPPED; 1351 atomic_add_int(&num_unmapped_aio, 1); 1352 } 1353 1354 offset += nbytes; 1355 } 1356 1357 /* Perform transfer. */ 1358 for (i = 0; i < iovcnt; i++) 1359 csw->d_strategy(bios[i]); 1360 free(bios, M_TEMP); 1361 1362 dev_relthread(dev, ref); 1363 return (0); 1364 1365 destroy_bios: 1366 for (; i >= 0; i--) 1367 aio_biocleanup(bios[i]); 1368 free(bios, M_TEMP); 1369 unref: 1370 dev_relthread(dev, ref); 1371 return (error); 1372 } 1373 1374 #ifdef COMPAT_FREEBSD6 1375 static int 1376 convert_old_sigevent(struct osigevent *osig, struct sigevent *nsig) 1377 { 1378 1379 /* 1380 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are 1381 * supported by AIO with the old sigevent structure. 1382 */ 1383 nsig->sigev_notify = osig->sigev_notify; 1384 switch (nsig->sigev_notify) { 1385 case SIGEV_NONE: 1386 break; 1387 case SIGEV_SIGNAL: 1388 nsig->sigev_signo = osig->__sigev_u.__sigev_signo; 1389 break; 1390 case SIGEV_KEVENT: 1391 nsig->sigev_notify_kqueue = 1392 osig->__sigev_u.__sigev_notify_kqueue; 1393 nsig->sigev_value.sival_ptr = osig->sigev_value.sival_ptr; 1394 break; 1395 default: 1396 return (EINVAL); 1397 } 1398 return (0); 1399 } 1400 1401 static int 1402 aiocb_copyin_old_sigevent(struct aiocb *ujob, struct kaiocb *kjob, 1403 int type __unused) 1404 { 1405 struct oaiocb *ojob; 1406 struct aiocb *kcb = &kjob->uaiocb; 1407 int error; 1408 1409 bzero(kcb, sizeof(struct aiocb)); 1410 error = copyin(ujob, kcb, sizeof(struct oaiocb)); 1411 if (error) 1412 return (error); 1413 /* No need to copyin aio_iov, because it did not exist in FreeBSD 6 */ 1414 ojob = (struct oaiocb *)kcb; 1415 return (convert_old_sigevent(&ojob->aio_sigevent, &kcb->aio_sigevent)); 1416 } 1417 #endif 1418 1419 static int 1420 aiocb_copyin(struct aiocb *ujob, struct kaiocb *kjob, int type) 1421 { 1422 struct aiocb *kcb = &kjob->uaiocb; 1423 int error; 1424 1425 error = copyin(ujob, kcb, sizeof(struct aiocb)); 1426 if (error) 1427 return (error); 1428 if (type == LIO_NOP) 1429 type = kcb->aio_lio_opcode; 1430 if (type & LIO_VECTORED) { 1431 /* malloc a uio and copy in the iovec */ 1432 error = copyinuio(__DEVOLATILE(struct iovec*, kcb->aio_iov), 1433 kcb->aio_iovcnt, &kjob->uiop); 1434 } 1435 1436 return (error); 1437 } 1438 1439 static long 1440 aiocb_fetch_status(struct aiocb *ujob) 1441 { 1442 1443 return (fuword(&ujob->_aiocb_private.status)); 1444 } 1445 1446 static long 1447 aiocb_fetch_error(struct aiocb *ujob) 1448 { 1449 1450 return (fuword(&ujob->_aiocb_private.error)); 1451 } 1452 1453 static int 1454 aiocb_store_status(struct aiocb *ujob, long status) 1455 { 1456 1457 return (suword(&ujob->_aiocb_private.status, status)); 1458 } 1459 1460 static int 1461 aiocb_store_error(struct aiocb *ujob, long error) 1462 { 1463 1464 return (suword(&ujob->_aiocb_private.error, error)); 1465 } 1466 1467 static int 1468 aiocb_store_kernelinfo(struct aiocb *ujob, long jobref) 1469 { 1470 1471 return (suword(&ujob->_aiocb_private.kernelinfo, jobref)); 1472 } 1473 1474 static int 1475 aiocb_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob) 1476 { 1477 1478 return (suword(ujobp, (long)ujob)); 1479 } 1480 1481 static struct aiocb_ops aiocb_ops = { 1482 .aio_copyin = aiocb_copyin, 1483 .fetch_status = aiocb_fetch_status, 1484 .fetch_error = aiocb_fetch_error, 1485 .store_status = aiocb_store_status, 1486 .store_error = aiocb_store_error, 1487 .store_kernelinfo = aiocb_store_kernelinfo, 1488 .store_aiocb = aiocb_store_aiocb, 1489 }; 1490 1491 #ifdef COMPAT_FREEBSD6 1492 static struct aiocb_ops aiocb_ops_osigevent = { 1493 .aio_copyin = aiocb_copyin_old_sigevent, 1494 .fetch_status = aiocb_fetch_status, 1495 .fetch_error = aiocb_fetch_error, 1496 .store_status = aiocb_store_status, 1497 .store_error = aiocb_store_error, 1498 .store_kernelinfo = aiocb_store_kernelinfo, 1499 .store_aiocb = aiocb_store_aiocb, 1500 }; 1501 #endif 1502 1503 /* 1504 * Queue a new AIO request. Choosing either the threaded or direct bio VCHR 1505 * technique is done in this code. 1506 */ 1507 int 1508 aio_aqueue(struct thread *td, struct aiocb *ujob, struct aioliojob *lj, 1509 int type, struct aiocb_ops *ops) 1510 { 1511 struct proc *p = td->td_proc; 1512 struct file *fp = NULL; 1513 struct kaiocb *job; 1514 struct kaioinfo *ki; 1515 struct kevent kev; 1516 int opcode; 1517 int error; 1518 int fd, kqfd; 1519 int jid; 1520 u_short evflags; 1521 1522 if (p->p_aioinfo == NULL) 1523 aio_init_aioinfo(p); 1524 1525 ki = p->p_aioinfo; 1526 1527 ops->store_status(ujob, -1); 1528 ops->store_error(ujob, 0); 1529 ops->store_kernelinfo(ujob, -1); 1530 1531 if (num_queue_count >= max_queue_count || 1532 ki->kaio_count >= max_aio_queue_per_proc) { 1533 error = EAGAIN; 1534 goto err1; 1535 } 1536 1537 job = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO); 1538 knlist_init_mtx(&job->klist, AIO_MTX(ki)); 1539 1540 error = ops->aio_copyin(ujob, job, type); 1541 if (error) 1542 goto err2; 1543 1544 if (job->uaiocb.aio_nbytes > IOSIZE_MAX) { 1545 error = EINVAL; 1546 goto err2; 1547 } 1548 1549 if (job->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT && 1550 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL && 1551 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID && 1552 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) { 1553 error = EINVAL; 1554 goto err2; 1555 } 1556 1557 if ((job->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL || 1558 job->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) && 1559 !_SIG_VALID(job->uaiocb.aio_sigevent.sigev_signo)) { 1560 error = EINVAL; 1561 goto err2; 1562 } 1563 1564 /* Get the opcode. */ 1565 if (type == LIO_NOP) { 1566 switch (job->uaiocb.aio_lio_opcode) { 1567 case LIO_WRITE: 1568 case LIO_WRITEV: 1569 case LIO_NOP: 1570 case LIO_READ: 1571 case LIO_READV: 1572 opcode = job->uaiocb.aio_lio_opcode; 1573 break; 1574 default: 1575 error = EINVAL; 1576 goto err2; 1577 } 1578 } else 1579 opcode = job->uaiocb.aio_lio_opcode = type; 1580 1581 ksiginfo_init(&job->ksi); 1582 1583 /* Save userspace address of the job info. */ 1584 job->ujob = ujob; 1585 1586 /* 1587 * Validate the opcode and fetch the file object for the specified 1588 * file descriptor. 1589 * 1590 * XXXRW: Moved the opcode validation up here so that we don't 1591 * retrieve a file descriptor without knowing what the capabiltity 1592 * should be. 1593 */ 1594 fd = job->uaiocb.aio_fildes; 1595 switch (opcode) { 1596 case LIO_WRITE: 1597 case LIO_WRITEV: 1598 error = fget_write(td, fd, &cap_pwrite_rights, &fp); 1599 break; 1600 case LIO_READ: 1601 case LIO_READV: 1602 error = fget_read(td, fd, &cap_pread_rights, &fp); 1603 break; 1604 case LIO_SYNC: 1605 case LIO_DSYNC: 1606 error = fget(td, fd, &cap_fsync_rights, &fp); 1607 break; 1608 case LIO_MLOCK: 1609 break; 1610 case LIO_NOP: 1611 error = fget(td, fd, &cap_no_rights, &fp); 1612 break; 1613 default: 1614 error = EINVAL; 1615 } 1616 if (error) 1617 goto err3; 1618 1619 if ((opcode & LIO_SYNC) && fp->f_vnode == NULL) { 1620 error = EINVAL; 1621 goto err3; 1622 } 1623 1624 if ((opcode == LIO_READ || opcode == LIO_READV || 1625 opcode == LIO_WRITE || opcode == LIO_WRITEV) && 1626 job->uaiocb.aio_offset < 0 && 1627 (fp->f_vnode == NULL || fp->f_vnode->v_type != VCHR)) { 1628 error = EINVAL; 1629 goto err3; 1630 } 1631 1632 if (fp != NULL && fp->f_ops == &path_fileops) { 1633 error = EBADF; 1634 goto err3; 1635 } 1636 1637 job->fd_file = fp; 1638 1639 mtx_lock(&aio_job_mtx); 1640 jid = jobrefid++; 1641 job->seqno = jobseqno++; 1642 mtx_unlock(&aio_job_mtx); 1643 error = ops->store_kernelinfo(ujob, jid); 1644 if (error) { 1645 error = EINVAL; 1646 goto err3; 1647 } 1648 job->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid; 1649 1650 if (opcode == LIO_NOP) { 1651 fdrop(fp, td); 1652 MPASS(job->uiop == &job->uio || job->uiop == NULL); 1653 uma_zfree(aiocb_zone, job); 1654 return (0); 1655 } 1656 1657 if (job->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT) 1658 goto no_kqueue; 1659 evflags = job->uaiocb.aio_sigevent.sigev_notify_kevent_flags; 1660 if ((evflags & ~(EV_CLEAR | EV_DISPATCH | EV_ONESHOT)) != 0) { 1661 error = EINVAL; 1662 goto err3; 1663 } 1664 kqfd = job->uaiocb.aio_sigevent.sigev_notify_kqueue; 1665 memset(&kev, 0, sizeof(kev)); 1666 kev.ident = (uintptr_t)job->ujob; 1667 kev.filter = EVFILT_AIO; 1668 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1 | evflags; 1669 kev.data = (intptr_t)job; 1670 kev.udata = job->uaiocb.aio_sigevent.sigev_value.sival_ptr; 1671 error = kqfd_register(kqfd, &kev, td, M_WAITOK); 1672 if (error) 1673 goto err3; 1674 1675 no_kqueue: 1676 1677 ops->store_error(ujob, EINPROGRESS); 1678 job->uaiocb._aiocb_private.error = EINPROGRESS; 1679 job->userproc = p; 1680 job->cred = crhold(td->td_ucred); 1681 job->jobflags = KAIOCB_QUEUEING; 1682 job->lio = lj; 1683 1684 if (opcode & LIO_VECTORED) { 1685 /* Use the uio copied in by aio_copyin */ 1686 MPASS(job->uiop != &job->uio && job->uiop != NULL); 1687 } else { 1688 /* Setup the inline uio */ 1689 job->iov[0].iov_base = (void *)(uintptr_t)job->uaiocb.aio_buf; 1690 job->iov[0].iov_len = job->uaiocb.aio_nbytes; 1691 job->uio.uio_iov = job->iov; 1692 job->uio.uio_iovcnt = 1; 1693 job->uio.uio_resid = job->uaiocb.aio_nbytes; 1694 job->uio.uio_segflg = UIO_USERSPACE; 1695 job->uiop = &job->uio; 1696 } 1697 switch (opcode & (LIO_READ | LIO_WRITE)) { 1698 case LIO_READ: 1699 job->uiop->uio_rw = UIO_READ; 1700 break; 1701 case LIO_WRITE: 1702 job->uiop->uio_rw = UIO_WRITE; 1703 break; 1704 } 1705 job->uiop->uio_offset = job->uaiocb.aio_offset; 1706 job->uiop->uio_td = td; 1707 1708 if (opcode == LIO_MLOCK) { 1709 aio_schedule(job, aio_process_mlock); 1710 error = 0; 1711 } else if (fp->f_ops->fo_aio_queue == NULL) 1712 error = aio_queue_file(fp, job); 1713 else 1714 error = fo_aio_queue(fp, job); 1715 if (error) 1716 goto err3; 1717 1718 AIO_LOCK(ki); 1719 job->jobflags &= ~KAIOCB_QUEUEING; 1720 TAILQ_INSERT_TAIL(&ki->kaio_all, job, allist); 1721 ki->kaio_count++; 1722 if (lj) 1723 lj->lioj_count++; 1724 atomic_add_int(&num_queue_count, 1); 1725 if (job->jobflags & KAIOCB_FINISHED) { 1726 /* 1727 * The queue callback completed the request synchronously. 1728 * The bulk of the completion is deferred in that case 1729 * until this point. 1730 */ 1731 aio_bio_done_notify(p, job); 1732 } else 1733 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, job, plist); 1734 AIO_UNLOCK(ki); 1735 return (0); 1736 1737 err3: 1738 if (fp) 1739 fdrop(fp, td); 1740 knlist_delete(&job->klist, curthread, 0); 1741 err2: 1742 if (job->uiop != &job->uio) 1743 free(job->uiop, M_IOV); 1744 uma_zfree(aiocb_zone, job); 1745 err1: 1746 ops->store_error(ujob, error); 1747 return (error); 1748 } 1749 1750 static void 1751 aio_cancel_daemon_job(struct kaiocb *job) 1752 { 1753 1754 mtx_lock(&aio_job_mtx); 1755 if (!aio_cancel_cleared(job)) 1756 TAILQ_REMOVE(&aio_jobs, job, list); 1757 mtx_unlock(&aio_job_mtx); 1758 aio_cancel(job); 1759 } 1760 1761 void 1762 aio_schedule(struct kaiocb *job, aio_handle_fn_t *func) 1763 { 1764 1765 mtx_lock(&aio_job_mtx); 1766 if (!aio_set_cancel_function(job, aio_cancel_daemon_job)) { 1767 mtx_unlock(&aio_job_mtx); 1768 aio_cancel(job); 1769 return; 1770 } 1771 job->handle_fn = func; 1772 TAILQ_INSERT_TAIL(&aio_jobs, job, list); 1773 aio_kick_nowait(job->userproc); 1774 mtx_unlock(&aio_job_mtx); 1775 } 1776 1777 static void 1778 aio_cancel_sync(struct kaiocb *job) 1779 { 1780 struct kaioinfo *ki; 1781 1782 ki = job->userproc->p_aioinfo; 1783 AIO_LOCK(ki); 1784 if (!aio_cancel_cleared(job)) 1785 TAILQ_REMOVE(&ki->kaio_syncqueue, job, list); 1786 AIO_UNLOCK(ki); 1787 aio_cancel(job); 1788 } 1789 1790 int 1791 aio_queue_file(struct file *fp, struct kaiocb *job) 1792 { 1793 struct kaioinfo *ki; 1794 struct kaiocb *job2; 1795 struct vnode *vp; 1796 struct mount *mp; 1797 int error; 1798 bool safe; 1799 1800 ki = job->userproc->p_aioinfo; 1801 error = aio_qbio(job->userproc, job); 1802 if (error >= 0) 1803 return (error); 1804 safe = false; 1805 if (fp->f_type == DTYPE_VNODE) { 1806 vp = fp->f_vnode; 1807 if (vp->v_type == VREG || vp->v_type == VDIR) { 1808 mp = fp->f_vnode->v_mount; 1809 if (mp == NULL || (mp->mnt_flag & MNT_LOCAL) != 0) 1810 safe = true; 1811 } 1812 } 1813 if (!(safe || enable_aio_unsafe)) { 1814 counted_warning(&unsafe_warningcnt, 1815 "is attempting to use unsafe AIO requests"); 1816 return (EOPNOTSUPP); 1817 } 1818 1819 if (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) { 1820 aio_schedule(job, aio_process_rw); 1821 error = 0; 1822 } else if (job->uaiocb.aio_lio_opcode & LIO_SYNC) { 1823 AIO_LOCK(ki); 1824 TAILQ_FOREACH(job2, &ki->kaio_jobqueue, plist) { 1825 if (job2->fd_file == job->fd_file && 1826 ((job2->uaiocb.aio_lio_opcode & LIO_SYNC) == 0) && 1827 job2->seqno < job->seqno) { 1828 job2->jobflags |= KAIOCB_CHECKSYNC; 1829 job->pending++; 1830 } 1831 } 1832 if (job->pending != 0) { 1833 if (!aio_set_cancel_function_locked(job, 1834 aio_cancel_sync)) { 1835 AIO_UNLOCK(ki); 1836 aio_cancel(job); 1837 return (0); 1838 } 1839 TAILQ_INSERT_TAIL(&ki->kaio_syncqueue, job, list); 1840 AIO_UNLOCK(ki); 1841 return (0); 1842 } 1843 AIO_UNLOCK(ki); 1844 aio_schedule(job, aio_process_sync); 1845 error = 0; 1846 } else { 1847 error = EINVAL; 1848 } 1849 return (error); 1850 } 1851 1852 static void 1853 aio_kick_nowait(struct proc *userp) 1854 { 1855 struct kaioinfo *ki = userp->p_aioinfo; 1856 struct aioproc *aiop; 1857 1858 mtx_assert(&aio_job_mtx, MA_OWNED); 1859 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1860 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1861 aiop->aioprocflags &= ~AIOP_FREE; 1862 wakeup(aiop->aioproc); 1863 } else if (num_aio_resv_start + num_aio_procs < max_aio_procs && 1864 ki->kaio_active_count + num_aio_resv_start < max_aio_per_proc) { 1865 taskqueue_enqueue(taskqueue_aiod_kick, &ki->kaio_task); 1866 } 1867 } 1868 1869 static int 1870 aio_kick(struct proc *userp) 1871 { 1872 struct kaioinfo *ki = userp->p_aioinfo; 1873 struct aioproc *aiop; 1874 int error, ret = 0; 1875 1876 mtx_assert(&aio_job_mtx, MA_OWNED); 1877 retryproc: 1878 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1879 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1880 aiop->aioprocflags &= ~AIOP_FREE; 1881 wakeup(aiop->aioproc); 1882 } else if (num_aio_resv_start + num_aio_procs < max_aio_procs && 1883 ki->kaio_active_count + num_aio_resv_start < max_aio_per_proc) { 1884 num_aio_resv_start++; 1885 mtx_unlock(&aio_job_mtx); 1886 error = aio_newproc(&num_aio_resv_start); 1887 mtx_lock(&aio_job_mtx); 1888 if (error) { 1889 num_aio_resv_start--; 1890 goto retryproc; 1891 } 1892 } else { 1893 ret = -1; 1894 } 1895 return (ret); 1896 } 1897 1898 static void 1899 aio_kick_helper(void *context, int pending) 1900 { 1901 struct proc *userp = context; 1902 1903 mtx_lock(&aio_job_mtx); 1904 while (--pending >= 0) { 1905 if (aio_kick(userp)) 1906 break; 1907 } 1908 mtx_unlock(&aio_job_mtx); 1909 } 1910 1911 /* 1912 * Support the aio_return system call, as a side-effect, kernel resources are 1913 * released. 1914 */ 1915 static int 1916 kern_aio_return(struct thread *td, struct aiocb *ujob, struct aiocb_ops *ops) 1917 { 1918 struct proc *p = td->td_proc; 1919 struct kaiocb *job; 1920 struct kaioinfo *ki; 1921 long status, error; 1922 1923 ki = p->p_aioinfo; 1924 if (ki == NULL) 1925 return (EINVAL); 1926 AIO_LOCK(ki); 1927 TAILQ_FOREACH(job, &ki->kaio_done, plist) { 1928 if (job->ujob == ujob) 1929 break; 1930 } 1931 if (job != NULL) { 1932 MPASS(job->jobflags & KAIOCB_FINISHED); 1933 status = job->uaiocb._aiocb_private.status; 1934 error = job->uaiocb._aiocb_private.error; 1935 td->td_retval[0] = status; 1936 td->td_ru.ru_oublock += job->outblock; 1937 td->td_ru.ru_inblock += job->inblock; 1938 td->td_ru.ru_msgsnd += job->msgsnd; 1939 td->td_ru.ru_msgrcv += job->msgrcv; 1940 aio_free_entry(job); 1941 AIO_UNLOCK(ki); 1942 ops->store_error(ujob, error); 1943 ops->store_status(ujob, status); 1944 } else { 1945 error = EINVAL; 1946 AIO_UNLOCK(ki); 1947 } 1948 return (error); 1949 } 1950 1951 int 1952 sys_aio_return(struct thread *td, struct aio_return_args *uap) 1953 { 1954 1955 return (kern_aio_return(td, uap->aiocbp, &aiocb_ops)); 1956 } 1957 1958 /* 1959 * Allow a process to wakeup when any of the I/O requests are completed. 1960 */ 1961 static int 1962 kern_aio_suspend(struct thread *td, int njoblist, struct aiocb **ujoblist, 1963 struct timespec *ts) 1964 { 1965 struct proc *p = td->td_proc; 1966 struct timeval atv; 1967 struct kaioinfo *ki; 1968 struct kaiocb *firstjob, *job; 1969 int error, i, timo; 1970 1971 timo = 0; 1972 if (ts) { 1973 if (ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000) 1974 return (EINVAL); 1975 1976 TIMESPEC_TO_TIMEVAL(&atv, ts); 1977 if (itimerfix(&atv)) 1978 return (EINVAL); 1979 timo = tvtohz(&atv); 1980 } 1981 1982 ki = p->p_aioinfo; 1983 if (ki == NULL) 1984 return (EAGAIN); 1985 1986 if (njoblist == 0) 1987 return (0); 1988 1989 AIO_LOCK(ki); 1990 for (;;) { 1991 firstjob = NULL; 1992 error = 0; 1993 TAILQ_FOREACH(job, &ki->kaio_all, allist) { 1994 for (i = 0; i < njoblist; i++) { 1995 if (job->ujob == ujoblist[i]) { 1996 if (firstjob == NULL) 1997 firstjob = job; 1998 if (job->jobflags & KAIOCB_FINISHED) 1999 goto RETURN; 2000 } 2001 } 2002 } 2003 /* All tasks were finished. */ 2004 if (firstjob == NULL) 2005 break; 2006 2007 ki->kaio_flags |= KAIO_WAKEUP; 2008 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH, 2009 "aiospn", timo); 2010 if (error == ERESTART) 2011 error = EINTR; 2012 if (error) 2013 break; 2014 } 2015 RETURN: 2016 AIO_UNLOCK(ki); 2017 return (error); 2018 } 2019 2020 int 2021 sys_aio_suspend(struct thread *td, struct aio_suspend_args *uap) 2022 { 2023 struct timespec ts, *tsp; 2024 struct aiocb **ujoblist; 2025 int error; 2026 2027 if (uap->nent < 0 || uap->nent > max_aio_queue_per_proc) 2028 return (EINVAL); 2029 2030 if (uap->timeout) { 2031 /* Get timespec struct. */ 2032 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) 2033 return (error); 2034 tsp = &ts; 2035 } else 2036 tsp = NULL; 2037 2038 ujoblist = malloc(uap->nent * sizeof(ujoblist[0]), M_AIOS, M_WAITOK); 2039 error = copyin(uap->aiocbp, ujoblist, uap->nent * sizeof(ujoblist[0])); 2040 if (error == 0) 2041 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp); 2042 free(ujoblist, M_AIOS); 2043 return (error); 2044 } 2045 2046 /* 2047 * aio_cancel cancels any non-bio aio operations not currently in progress. 2048 */ 2049 int 2050 sys_aio_cancel(struct thread *td, struct aio_cancel_args *uap) 2051 { 2052 struct proc *p = td->td_proc; 2053 struct kaioinfo *ki; 2054 struct kaiocb *job, *jobn; 2055 struct file *fp; 2056 int error; 2057 int cancelled = 0; 2058 int notcancelled = 0; 2059 struct vnode *vp; 2060 2061 /* Lookup file object. */ 2062 error = fget(td, uap->fd, &cap_no_rights, &fp); 2063 if (error) 2064 return (error); 2065 2066 ki = p->p_aioinfo; 2067 if (ki == NULL) 2068 goto done; 2069 2070 if (fp->f_type == DTYPE_VNODE) { 2071 vp = fp->f_vnode; 2072 if (vn_isdisk(vp)) { 2073 fdrop(fp, td); 2074 td->td_retval[0] = AIO_NOTCANCELED; 2075 return (0); 2076 } 2077 } 2078 2079 AIO_LOCK(ki); 2080 TAILQ_FOREACH_SAFE(job, &ki->kaio_jobqueue, plist, jobn) { 2081 if ((uap->fd == job->uaiocb.aio_fildes) && 2082 ((uap->aiocbp == NULL) || 2083 (uap->aiocbp == job->ujob))) { 2084 if (aio_cancel_job(p, ki, job)) { 2085 cancelled++; 2086 } else { 2087 notcancelled++; 2088 } 2089 if (uap->aiocbp != NULL) 2090 break; 2091 } 2092 } 2093 AIO_UNLOCK(ki); 2094 2095 done: 2096 fdrop(fp, td); 2097 2098 if (uap->aiocbp != NULL) { 2099 if (cancelled) { 2100 td->td_retval[0] = AIO_CANCELED; 2101 return (0); 2102 } 2103 } 2104 2105 if (notcancelled) { 2106 td->td_retval[0] = AIO_NOTCANCELED; 2107 return (0); 2108 } 2109 2110 if (cancelled) { 2111 td->td_retval[0] = AIO_CANCELED; 2112 return (0); 2113 } 2114 2115 td->td_retval[0] = AIO_ALLDONE; 2116 2117 return (0); 2118 } 2119 2120 /* 2121 * aio_error is implemented in the kernel level for compatibility purposes 2122 * only. For a user mode async implementation, it would be best to do it in 2123 * a userland subroutine. 2124 */ 2125 static int 2126 kern_aio_error(struct thread *td, struct aiocb *ujob, struct aiocb_ops *ops) 2127 { 2128 struct proc *p = td->td_proc; 2129 struct kaiocb *job; 2130 struct kaioinfo *ki; 2131 int status; 2132 2133 ki = p->p_aioinfo; 2134 if (ki == NULL) { 2135 td->td_retval[0] = EINVAL; 2136 return (0); 2137 } 2138 2139 AIO_LOCK(ki); 2140 TAILQ_FOREACH(job, &ki->kaio_all, allist) { 2141 if (job->ujob == ujob) { 2142 if (job->jobflags & KAIOCB_FINISHED) 2143 td->td_retval[0] = 2144 job->uaiocb._aiocb_private.error; 2145 else 2146 td->td_retval[0] = EINPROGRESS; 2147 AIO_UNLOCK(ki); 2148 return (0); 2149 } 2150 } 2151 AIO_UNLOCK(ki); 2152 2153 /* 2154 * Hack for failure of aio_aqueue. 2155 */ 2156 status = ops->fetch_status(ujob); 2157 if (status == -1) { 2158 td->td_retval[0] = ops->fetch_error(ujob); 2159 return (0); 2160 } 2161 2162 td->td_retval[0] = EINVAL; 2163 return (0); 2164 } 2165 2166 int 2167 sys_aio_error(struct thread *td, struct aio_error_args *uap) 2168 { 2169 2170 return (kern_aio_error(td, uap->aiocbp, &aiocb_ops)); 2171 } 2172 2173 /* syscall - asynchronous read from a file (REALTIME) */ 2174 #ifdef COMPAT_FREEBSD6 2175 int 2176 freebsd6_aio_read(struct thread *td, struct freebsd6_aio_read_args *uap) 2177 { 2178 2179 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 2180 &aiocb_ops_osigevent)); 2181 } 2182 #endif 2183 2184 int 2185 sys_aio_read(struct thread *td, struct aio_read_args *uap) 2186 { 2187 2188 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, &aiocb_ops)); 2189 } 2190 2191 int 2192 sys_aio_readv(struct thread *td, struct aio_readv_args *uap) 2193 { 2194 2195 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_READV, &aiocb_ops)); 2196 } 2197 2198 /* syscall - asynchronous write to a file (REALTIME) */ 2199 #ifdef COMPAT_FREEBSD6 2200 int 2201 freebsd6_aio_write(struct thread *td, struct freebsd6_aio_write_args *uap) 2202 { 2203 2204 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 2205 &aiocb_ops_osigevent)); 2206 } 2207 #endif 2208 2209 int 2210 sys_aio_write(struct thread *td, struct aio_write_args *uap) 2211 { 2212 2213 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, &aiocb_ops)); 2214 } 2215 2216 int 2217 sys_aio_writev(struct thread *td, struct aio_writev_args *uap) 2218 { 2219 2220 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITEV, &aiocb_ops)); 2221 } 2222 2223 int 2224 sys_aio_mlock(struct thread *td, struct aio_mlock_args *uap) 2225 { 2226 2227 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_MLOCK, &aiocb_ops)); 2228 } 2229 2230 static int 2231 kern_lio_listio(struct thread *td, int mode, struct aiocb * const *uacb_list, 2232 struct aiocb **acb_list, int nent, struct sigevent *sig, 2233 struct aiocb_ops *ops) 2234 { 2235 struct proc *p = td->td_proc; 2236 struct aiocb *job; 2237 struct kaioinfo *ki; 2238 struct aioliojob *lj; 2239 struct kevent kev; 2240 int error; 2241 int nagain, nerror; 2242 int i; 2243 2244 if ((mode != LIO_NOWAIT) && (mode != LIO_WAIT)) 2245 return (EINVAL); 2246 2247 if (nent < 0 || nent > max_aio_queue_per_proc) 2248 return (EINVAL); 2249 2250 if (p->p_aioinfo == NULL) 2251 aio_init_aioinfo(p); 2252 2253 ki = p->p_aioinfo; 2254 2255 lj = uma_zalloc(aiolio_zone, M_WAITOK); 2256 lj->lioj_flags = 0; 2257 lj->lioj_count = 0; 2258 lj->lioj_finished_count = 0; 2259 lj->lioj_signal.sigev_notify = SIGEV_NONE; 2260 knlist_init_mtx(&lj->klist, AIO_MTX(ki)); 2261 ksiginfo_init(&lj->lioj_ksi); 2262 2263 /* 2264 * Setup signal. 2265 */ 2266 if (sig && (mode == LIO_NOWAIT)) { 2267 bcopy(sig, &lj->lioj_signal, sizeof(lj->lioj_signal)); 2268 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { 2269 /* Assume only new style KEVENT */ 2270 memset(&kev, 0, sizeof(kev)); 2271 kev.filter = EVFILT_LIO; 2272 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; 2273 kev.ident = (uintptr_t)uacb_list; /* something unique */ 2274 kev.data = (intptr_t)lj; 2275 /* pass user defined sigval data */ 2276 kev.udata = lj->lioj_signal.sigev_value.sival_ptr; 2277 error = kqfd_register( 2278 lj->lioj_signal.sigev_notify_kqueue, &kev, td, 2279 M_WAITOK); 2280 if (error) { 2281 uma_zfree(aiolio_zone, lj); 2282 return (error); 2283 } 2284 } else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) { 2285 ; 2286 } else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || 2287 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) { 2288 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { 2289 uma_zfree(aiolio_zone, lj); 2290 return EINVAL; 2291 } 2292 lj->lioj_flags |= LIOJ_SIGNAL; 2293 } else { 2294 uma_zfree(aiolio_zone, lj); 2295 return EINVAL; 2296 } 2297 } 2298 2299 AIO_LOCK(ki); 2300 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); 2301 /* 2302 * Add extra aiocb count to avoid the lio to be freed 2303 * by other threads doing aio_waitcomplete or aio_return, 2304 * and prevent event from being sent until we have queued 2305 * all tasks. 2306 */ 2307 lj->lioj_count = 1; 2308 AIO_UNLOCK(ki); 2309 2310 /* 2311 * Get pointers to the list of I/O requests. 2312 */ 2313 nagain = 0; 2314 nerror = 0; 2315 for (i = 0; i < nent; i++) { 2316 job = acb_list[i]; 2317 if (job != NULL) { 2318 error = aio_aqueue(td, job, lj, LIO_NOP, ops); 2319 if (error == EAGAIN) 2320 nagain++; 2321 else if (error != 0) 2322 nerror++; 2323 } 2324 } 2325 2326 error = 0; 2327 AIO_LOCK(ki); 2328 if (mode == LIO_WAIT) { 2329 while (lj->lioj_count - 1 != lj->lioj_finished_count) { 2330 ki->kaio_flags |= KAIO_WAKEUP; 2331 error = msleep(&p->p_aioinfo, AIO_MTX(ki), 2332 PRIBIO | PCATCH, "aiospn", 0); 2333 if (error == ERESTART) 2334 error = EINTR; 2335 if (error) 2336 break; 2337 } 2338 } else { 2339 if (lj->lioj_count - 1 == lj->lioj_finished_count) { 2340 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { 2341 lj->lioj_flags |= LIOJ_KEVENT_POSTED; 2342 KNOTE_LOCKED(&lj->klist, 1); 2343 } 2344 if ((lj->lioj_flags & (LIOJ_SIGNAL | 2345 LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL && 2346 (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || 2347 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) { 2348 aio_sendsig(p, &lj->lioj_signal, &lj->lioj_ksi, 2349 lj->lioj_count != 1); 2350 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2351 } 2352 } 2353 } 2354 lj->lioj_count--; 2355 if (lj->lioj_count == 0) { 2356 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 2357 knlist_delete(&lj->klist, curthread, 1); 2358 PROC_LOCK(p); 2359 sigqueue_take(&lj->lioj_ksi); 2360 PROC_UNLOCK(p); 2361 AIO_UNLOCK(ki); 2362 uma_zfree(aiolio_zone, lj); 2363 } else 2364 AIO_UNLOCK(ki); 2365 2366 if (nerror) 2367 return (EIO); 2368 else if (nagain) 2369 return (EAGAIN); 2370 else 2371 return (error); 2372 } 2373 2374 /* syscall - list directed I/O (REALTIME) */ 2375 #ifdef COMPAT_FREEBSD6 2376 int 2377 freebsd6_lio_listio(struct thread *td, struct freebsd6_lio_listio_args *uap) 2378 { 2379 struct aiocb **acb_list; 2380 struct sigevent *sigp, sig; 2381 struct osigevent osig; 2382 int error, nent; 2383 2384 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 2385 return (EINVAL); 2386 2387 nent = uap->nent; 2388 if (nent < 0 || nent > max_aio_queue_per_proc) 2389 return (EINVAL); 2390 2391 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2392 error = copyin(uap->sig, &osig, sizeof(osig)); 2393 if (error) 2394 return (error); 2395 error = convert_old_sigevent(&osig, &sig); 2396 if (error) 2397 return (error); 2398 sigp = &sig; 2399 } else 2400 sigp = NULL; 2401 2402 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 2403 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0])); 2404 if (error == 0) 2405 error = kern_lio_listio(td, uap->mode, 2406 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp, 2407 &aiocb_ops_osigevent); 2408 free(acb_list, M_LIO); 2409 return (error); 2410 } 2411 #endif 2412 2413 /* syscall - list directed I/O (REALTIME) */ 2414 int 2415 sys_lio_listio(struct thread *td, struct lio_listio_args *uap) 2416 { 2417 struct aiocb **acb_list; 2418 struct sigevent *sigp, sig; 2419 int error, nent; 2420 2421 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 2422 return (EINVAL); 2423 2424 nent = uap->nent; 2425 if (nent < 0 || nent > max_aio_queue_per_proc) 2426 return (EINVAL); 2427 2428 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2429 error = copyin(uap->sig, &sig, sizeof(sig)); 2430 if (error) 2431 return (error); 2432 sigp = &sig; 2433 } else 2434 sigp = NULL; 2435 2436 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 2437 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0])); 2438 if (error == 0) 2439 error = kern_lio_listio(td, uap->mode, uap->acb_list, acb_list, 2440 nent, sigp, &aiocb_ops); 2441 free(acb_list, M_LIO); 2442 return (error); 2443 } 2444 2445 static void 2446 aio_biocleanup(struct bio *bp) 2447 { 2448 struct kaiocb *job = (struct kaiocb *)bp->bio_caller1; 2449 struct kaioinfo *ki; 2450 struct buf *pbuf = (struct buf *)bp->bio_caller2; 2451 2452 /* Release mapping into kernel space. */ 2453 if (pbuf != NULL) { 2454 MPASS(pbuf->b_npages <= atop(maxphys) + 1); 2455 pmap_qremove((vm_offset_t)pbuf->b_data, pbuf->b_npages); 2456 vm_page_unhold_pages(pbuf->b_pages, pbuf->b_npages); 2457 uma_zfree(pbuf_zone, pbuf); 2458 atomic_subtract_int(&num_buf_aio, 1); 2459 ki = job->userproc->p_aioinfo; 2460 AIO_LOCK(ki); 2461 ki->kaio_buffer_count--; 2462 AIO_UNLOCK(ki); 2463 } else { 2464 MPASS(bp->bio_ma_n <= atop(maxphys) + 1); 2465 vm_page_unhold_pages(bp->bio_ma, bp->bio_ma_n); 2466 free(bp->bio_ma, M_TEMP); 2467 atomic_subtract_int(&num_unmapped_aio, 1); 2468 } 2469 g_destroy_bio(bp); 2470 } 2471 2472 static void 2473 aio_biowakeup(struct bio *bp) 2474 { 2475 struct kaiocb *job = (struct kaiocb *)bp->bio_caller1; 2476 size_t nbytes; 2477 long bcount = bp->bio_bcount; 2478 long resid = bp->bio_resid; 2479 int error, opcode, nblks; 2480 int bio_error = bp->bio_error; 2481 uint16_t flags = bp->bio_flags; 2482 2483 opcode = job->uaiocb.aio_lio_opcode; 2484 2485 aio_biocleanup(bp); 2486 2487 nbytes =bcount - resid; 2488 atomic_add_acq_long(&job->nbytes, nbytes); 2489 nblks = btodb(nbytes); 2490 error = 0; 2491 /* 2492 * If multiple bios experienced an error, the job will reflect the 2493 * error of whichever failed bio completed last. 2494 */ 2495 if (flags & BIO_ERROR) 2496 atomic_set_int(&job->error, bio_error); 2497 if (opcode & LIO_WRITE) 2498 atomic_add_int(&job->outblock, nblks); 2499 else 2500 atomic_add_int(&job->inblock, nblks); 2501 atomic_subtract_int(&job->nbio, 1); 2502 2503 2504 if (atomic_load_int(&job->nbio) == 0) { 2505 if (atomic_load_int(&job->error)) 2506 aio_complete(job, -1, job->error); 2507 else 2508 aio_complete(job, atomic_load_long(&job->nbytes), 0); 2509 } 2510 } 2511 2512 /* syscall - wait for the next completion of an aio request */ 2513 static int 2514 kern_aio_waitcomplete(struct thread *td, struct aiocb **ujobp, 2515 struct timespec *ts, struct aiocb_ops *ops) 2516 { 2517 struct proc *p = td->td_proc; 2518 struct timeval atv; 2519 struct kaioinfo *ki; 2520 struct kaiocb *job; 2521 struct aiocb *ujob; 2522 long error, status; 2523 int timo; 2524 2525 ops->store_aiocb(ujobp, NULL); 2526 2527 if (ts == NULL) { 2528 timo = 0; 2529 } else if (ts->tv_sec == 0 && ts->tv_nsec == 0) { 2530 timo = -1; 2531 } else { 2532 if ((ts->tv_nsec < 0) || (ts->tv_nsec >= 1000000000)) 2533 return (EINVAL); 2534 2535 TIMESPEC_TO_TIMEVAL(&atv, ts); 2536 if (itimerfix(&atv)) 2537 return (EINVAL); 2538 timo = tvtohz(&atv); 2539 } 2540 2541 if (p->p_aioinfo == NULL) 2542 aio_init_aioinfo(p); 2543 ki = p->p_aioinfo; 2544 2545 error = 0; 2546 job = NULL; 2547 AIO_LOCK(ki); 2548 while ((job = TAILQ_FIRST(&ki->kaio_done)) == NULL) { 2549 if (timo == -1) { 2550 error = EWOULDBLOCK; 2551 break; 2552 } 2553 ki->kaio_flags |= KAIO_WAKEUP; 2554 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH, 2555 "aiowc", timo); 2556 if (timo && error == ERESTART) 2557 error = EINTR; 2558 if (error) 2559 break; 2560 } 2561 2562 if (job != NULL) { 2563 MPASS(job->jobflags & KAIOCB_FINISHED); 2564 ujob = job->ujob; 2565 status = job->uaiocb._aiocb_private.status; 2566 error = job->uaiocb._aiocb_private.error; 2567 td->td_retval[0] = status; 2568 td->td_ru.ru_oublock += job->outblock; 2569 td->td_ru.ru_inblock += job->inblock; 2570 td->td_ru.ru_msgsnd += job->msgsnd; 2571 td->td_ru.ru_msgrcv += job->msgrcv; 2572 aio_free_entry(job); 2573 AIO_UNLOCK(ki); 2574 ops->store_aiocb(ujobp, ujob); 2575 ops->store_error(ujob, error); 2576 ops->store_status(ujob, status); 2577 } else 2578 AIO_UNLOCK(ki); 2579 2580 return (error); 2581 } 2582 2583 int 2584 sys_aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap) 2585 { 2586 struct timespec ts, *tsp; 2587 int error; 2588 2589 if (uap->timeout) { 2590 /* Get timespec struct. */ 2591 error = copyin(uap->timeout, &ts, sizeof(ts)); 2592 if (error) 2593 return (error); 2594 tsp = &ts; 2595 } else 2596 tsp = NULL; 2597 2598 return (kern_aio_waitcomplete(td, uap->aiocbp, tsp, &aiocb_ops)); 2599 } 2600 2601 static int 2602 kern_aio_fsync(struct thread *td, int op, struct aiocb *ujob, 2603 struct aiocb_ops *ops) 2604 { 2605 int listop; 2606 2607 switch (op) { 2608 case O_SYNC: 2609 listop = LIO_SYNC; 2610 break; 2611 case O_DSYNC: 2612 listop = LIO_DSYNC; 2613 break; 2614 default: 2615 return (EINVAL); 2616 } 2617 2618 return (aio_aqueue(td, ujob, NULL, listop, ops)); 2619 } 2620 2621 int 2622 sys_aio_fsync(struct thread *td, struct aio_fsync_args *uap) 2623 { 2624 2625 return (kern_aio_fsync(td, uap->op, uap->aiocbp, &aiocb_ops)); 2626 } 2627 2628 /* kqueue attach function */ 2629 static int 2630 filt_aioattach(struct knote *kn) 2631 { 2632 struct kaiocb *job; 2633 2634 job = (struct kaiocb *)(uintptr_t)kn->kn_sdata; 2635 2636 /* 2637 * The job pointer must be validated before using it, so 2638 * registration is restricted to the kernel; the user cannot 2639 * set EV_FLAG1. 2640 */ 2641 if ((kn->kn_flags & EV_FLAG1) == 0) 2642 return (EPERM); 2643 kn->kn_ptr.p_aio = job; 2644 kn->kn_flags &= ~EV_FLAG1; 2645 2646 knlist_add(&job->klist, kn, 0); 2647 2648 return (0); 2649 } 2650 2651 /* kqueue detach function */ 2652 static void 2653 filt_aiodetach(struct knote *kn) 2654 { 2655 struct knlist *knl; 2656 2657 knl = &kn->kn_ptr.p_aio->klist; 2658 knl->kl_lock(knl->kl_lockarg); 2659 if (!knlist_empty(knl)) 2660 knlist_remove(knl, kn, 1); 2661 knl->kl_unlock(knl->kl_lockarg); 2662 } 2663 2664 /* kqueue filter function */ 2665 /*ARGSUSED*/ 2666 static int 2667 filt_aio(struct knote *kn, long hint) 2668 { 2669 struct kaiocb *job = kn->kn_ptr.p_aio; 2670 2671 kn->kn_data = job->uaiocb._aiocb_private.error; 2672 if (!(job->jobflags & KAIOCB_FINISHED)) 2673 return (0); 2674 kn->kn_flags |= EV_EOF; 2675 return (1); 2676 } 2677 2678 /* kqueue attach function */ 2679 static int 2680 filt_lioattach(struct knote *kn) 2681 { 2682 struct aioliojob *lj; 2683 2684 lj = (struct aioliojob *)(uintptr_t)kn->kn_sdata; 2685 2686 /* 2687 * The aioliojob pointer must be validated before using it, so 2688 * registration is restricted to the kernel; the user cannot 2689 * set EV_FLAG1. 2690 */ 2691 if ((kn->kn_flags & EV_FLAG1) == 0) 2692 return (EPERM); 2693 kn->kn_ptr.p_lio = lj; 2694 kn->kn_flags &= ~EV_FLAG1; 2695 2696 knlist_add(&lj->klist, kn, 0); 2697 2698 return (0); 2699 } 2700 2701 /* kqueue detach function */ 2702 static void 2703 filt_liodetach(struct knote *kn) 2704 { 2705 struct knlist *knl; 2706 2707 knl = &kn->kn_ptr.p_lio->klist; 2708 knl->kl_lock(knl->kl_lockarg); 2709 if (!knlist_empty(knl)) 2710 knlist_remove(knl, kn, 1); 2711 knl->kl_unlock(knl->kl_lockarg); 2712 } 2713 2714 /* kqueue filter function */ 2715 /*ARGSUSED*/ 2716 static int 2717 filt_lio(struct knote *kn, long hint) 2718 { 2719 struct aioliojob * lj = kn->kn_ptr.p_lio; 2720 2721 return (lj->lioj_flags & LIOJ_KEVENT_POSTED); 2722 } 2723 2724 #ifdef COMPAT_FREEBSD32 2725 #include <sys/mount.h> 2726 #include <sys/socket.h> 2727 #include <compat/freebsd32/freebsd32.h> 2728 #include <compat/freebsd32/freebsd32_proto.h> 2729 #include <compat/freebsd32/freebsd32_signal.h> 2730 #include <compat/freebsd32/freebsd32_syscall.h> 2731 #include <compat/freebsd32/freebsd32_util.h> 2732 2733 struct __aiocb_private32 { 2734 int32_t status; 2735 int32_t error; 2736 uint32_t kernelinfo; 2737 }; 2738 2739 #ifdef COMPAT_FREEBSD6 2740 typedef struct oaiocb32 { 2741 int aio_fildes; /* File descriptor */ 2742 uint64_t aio_offset __packed; /* File offset for I/O */ 2743 uint32_t aio_buf; /* I/O buffer in process space */ 2744 uint32_t aio_nbytes; /* Number of bytes for I/O */ 2745 struct osigevent32 aio_sigevent; /* Signal to deliver */ 2746 int aio_lio_opcode; /* LIO opcode */ 2747 int aio_reqprio; /* Request priority -- ignored */ 2748 struct __aiocb_private32 _aiocb_private; 2749 } oaiocb32_t; 2750 #endif 2751 2752 typedef struct aiocb32 { 2753 int32_t aio_fildes; /* File descriptor */ 2754 uint64_t aio_offset __packed; /* File offset for I/O */ 2755 uint32_t aio_buf; /* I/O buffer in process space */ 2756 uint32_t aio_nbytes; /* Number of bytes for I/O */ 2757 int __spare__[2]; 2758 uint32_t __spare2__; 2759 int aio_lio_opcode; /* LIO opcode */ 2760 int aio_reqprio; /* Request priority -- ignored */ 2761 struct __aiocb_private32 _aiocb_private; 2762 struct sigevent32 aio_sigevent; /* Signal to deliver */ 2763 } aiocb32_t; 2764 2765 #ifdef COMPAT_FREEBSD6 2766 static int 2767 convert_old_sigevent32(struct osigevent32 *osig, struct sigevent *nsig) 2768 { 2769 2770 /* 2771 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are 2772 * supported by AIO with the old sigevent structure. 2773 */ 2774 CP(*osig, *nsig, sigev_notify); 2775 switch (nsig->sigev_notify) { 2776 case SIGEV_NONE: 2777 break; 2778 case SIGEV_SIGNAL: 2779 nsig->sigev_signo = osig->__sigev_u.__sigev_signo; 2780 break; 2781 case SIGEV_KEVENT: 2782 nsig->sigev_notify_kqueue = 2783 osig->__sigev_u.__sigev_notify_kqueue; 2784 PTRIN_CP(*osig, *nsig, sigev_value.sival_ptr); 2785 break; 2786 default: 2787 return (EINVAL); 2788 } 2789 return (0); 2790 } 2791 2792 static int 2793 aiocb32_copyin_old_sigevent(struct aiocb *ujob, struct kaiocb *kjob, 2794 int type __unused) 2795 { 2796 struct oaiocb32 job32; 2797 struct aiocb *kcb = &kjob->uaiocb; 2798 int error; 2799 2800 bzero(kcb, sizeof(struct aiocb)); 2801 error = copyin(ujob, &job32, sizeof(job32)); 2802 if (error) 2803 return (error); 2804 2805 /* No need to copyin aio_iov, because it did not exist in FreeBSD 6 */ 2806 2807 CP(job32, *kcb, aio_fildes); 2808 CP(job32, *kcb, aio_offset); 2809 PTRIN_CP(job32, *kcb, aio_buf); 2810 CP(job32, *kcb, aio_nbytes); 2811 CP(job32, *kcb, aio_lio_opcode); 2812 CP(job32, *kcb, aio_reqprio); 2813 CP(job32, *kcb, _aiocb_private.status); 2814 CP(job32, *kcb, _aiocb_private.error); 2815 PTRIN_CP(job32, *kcb, _aiocb_private.kernelinfo); 2816 return (convert_old_sigevent32(&job32.aio_sigevent, 2817 &kcb->aio_sigevent)); 2818 } 2819 #endif 2820 2821 static int 2822 aiocb32_copyin(struct aiocb *ujob, struct kaiocb *kjob, int type) 2823 { 2824 struct aiocb32 job32; 2825 struct aiocb *kcb = &kjob->uaiocb; 2826 struct iovec32 *iov32; 2827 int error; 2828 2829 error = copyin(ujob, &job32, sizeof(job32)); 2830 if (error) 2831 return (error); 2832 CP(job32, *kcb, aio_fildes); 2833 CP(job32, *kcb, aio_offset); 2834 CP(job32, *kcb, aio_lio_opcode); 2835 if (type == LIO_NOP) 2836 type = kcb->aio_lio_opcode; 2837 if (type & LIO_VECTORED) { 2838 iov32 = PTRIN(job32.aio_iov); 2839 CP(job32, *kcb, aio_iovcnt); 2840 /* malloc a uio and copy in the iovec */ 2841 error = freebsd32_copyinuio(iov32, 2842 kcb->aio_iovcnt, &kjob->uiop); 2843 if (error) 2844 return (error); 2845 } else { 2846 PTRIN_CP(job32, *kcb, aio_buf); 2847 CP(job32, *kcb, aio_nbytes); 2848 } 2849 CP(job32, *kcb, aio_reqprio); 2850 CP(job32, *kcb, _aiocb_private.status); 2851 CP(job32, *kcb, _aiocb_private.error); 2852 PTRIN_CP(job32, *kcb, _aiocb_private.kernelinfo); 2853 error = convert_sigevent32(&job32.aio_sigevent, &kcb->aio_sigevent); 2854 2855 return (error); 2856 } 2857 2858 static long 2859 aiocb32_fetch_status(struct aiocb *ujob) 2860 { 2861 struct aiocb32 *ujob32; 2862 2863 ujob32 = (struct aiocb32 *)ujob; 2864 return (fuword32(&ujob32->_aiocb_private.status)); 2865 } 2866 2867 static long 2868 aiocb32_fetch_error(struct aiocb *ujob) 2869 { 2870 struct aiocb32 *ujob32; 2871 2872 ujob32 = (struct aiocb32 *)ujob; 2873 return (fuword32(&ujob32->_aiocb_private.error)); 2874 } 2875 2876 static int 2877 aiocb32_store_status(struct aiocb *ujob, long status) 2878 { 2879 struct aiocb32 *ujob32; 2880 2881 ujob32 = (struct aiocb32 *)ujob; 2882 return (suword32(&ujob32->_aiocb_private.status, status)); 2883 } 2884 2885 static int 2886 aiocb32_store_error(struct aiocb *ujob, long error) 2887 { 2888 struct aiocb32 *ujob32; 2889 2890 ujob32 = (struct aiocb32 *)ujob; 2891 return (suword32(&ujob32->_aiocb_private.error, error)); 2892 } 2893 2894 static int 2895 aiocb32_store_kernelinfo(struct aiocb *ujob, long jobref) 2896 { 2897 struct aiocb32 *ujob32; 2898 2899 ujob32 = (struct aiocb32 *)ujob; 2900 return (suword32(&ujob32->_aiocb_private.kernelinfo, jobref)); 2901 } 2902 2903 static int 2904 aiocb32_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob) 2905 { 2906 2907 return (suword32(ujobp, (long)ujob)); 2908 } 2909 2910 static struct aiocb_ops aiocb32_ops = { 2911 .aio_copyin = aiocb32_copyin, 2912 .fetch_status = aiocb32_fetch_status, 2913 .fetch_error = aiocb32_fetch_error, 2914 .store_status = aiocb32_store_status, 2915 .store_error = aiocb32_store_error, 2916 .store_kernelinfo = aiocb32_store_kernelinfo, 2917 .store_aiocb = aiocb32_store_aiocb, 2918 }; 2919 2920 #ifdef COMPAT_FREEBSD6 2921 static struct aiocb_ops aiocb32_ops_osigevent = { 2922 .aio_copyin = aiocb32_copyin_old_sigevent, 2923 .fetch_status = aiocb32_fetch_status, 2924 .fetch_error = aiocb32_fetch_error, 2925 .store_status = aiocb32_store_status, 2926 .store_error = aiocb32_store_error, 2927 .store_kernelinfo = aiocb32_store_kernelinfo, 2928 .store_aiocb = aiocb32_store_aiocb, 2929 }; 2930 #endif 2931 2932 int 2933 freebsd32_aio_return(struct thread *td, struct freebsd32_aio_return_args *uap) 2934 { 2935 2936 return (kern_aio_return(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops)); 2937 } 2938 2939 int 2940 freebsd32_aio_suspend(struct thread *td, struct freebsd32_aio_suspend_args *uap) 2941 { 2942 struct timespec32 ts32; 2943 struct timespec ts, *tsp; 2944 struct aiocb **ujoblist; 2945 uint32_t *ujoblist32; 2946 int error, i; 2947 2948 if (uap->nent < 0 || uap->nent > max_aio_queue_per_proc) 2949 return (EINVAL); 2950 2951 if (uap->timeout) { 2952 /* Get timespec struct. */ 2953 if ((error = copyin(uap->timeout, &ts32, sizeof(ts32))) != 0) 2954 return (error); 2955 CP(ts32, ts, tv_sec); 2956 CP(ts32, ts, tv_nsec); 2957 tsp = &ts; 2958 } else 2959 tsp = NULL; 2960 2961 ujoblist = malloc(uap->nent * sizeof(ujoblist[0]), M_AIOS, M_WAITOK); 2962 ujoblist32 = (uint32_t *)ujoblist; 2963 error = copyin(uap->aiocbp, ujoblist32, uap->nent * 2964 sizeof(ujoblist32[0])); 2965 if (error == 0) { 2966 for (i = uap->nent - 1; i >= 0; i--) 2967 ujoblist[i] = PTRIN(ujoblist32[i]); 2968 2969 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp); 2970 } 2971 free(ujoblist, M_AIOS); 2972 return (error); 2973 } 2974 2975 int 2976 freebsd32_aio_error(struct thread *td, struct freebsd32_aio_error_args *uap) 2977 { 2978 2979 return (kern_aio_error(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops)); 2980 } 2981 2982 #ifdef COMPAT_FREEBSD6 2983 int 2984 freebsd6_freebsd32_aio_read(struct thread *td, 2985 struct freebsd6_freebsd32_aio_read_args *uap) 2986 { 2987 2988 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 2989 &aiocb32_ops_osigevent)); 2990 } 2991 #endif 2992 2993 int 2994 freebsd32_aio_read(struct thread *td, struct freebsd32_aio_read_args *uap) 2995 { 2996 2997 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 2998 &aiocb32_ops)); 2999 } 3000 3001 int 3002 freebsd32_aio_readv(struct thread *td, struct freebsd32_aio_readv_args *uap) 3003 { 3004 3005 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READV, 3006 &aiocb32_ops)); 3007 } 3008 3009 #ifdef COMPAT_FREEBSD6 3010 int 3011 freebsd6_freebsd32_aio_write(struct thread *td, 3012 struct freebsd6_freebsd32_aio_write_args *uap) 3013 { 3014 3015 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 3016 &aiocb32_ops_osigevent)); 3017 } 3018 #endif 3019 3020 int 3021 freebsd32_aio_write(struct thread *td, struct freebsd32_aio_write_args *uap) 3022 { 3023 3024 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 3025 &aiocb32_ops)); 3026 } 3027 3028 int 3029 freebsd32_aio_writev(struct thread *td, struct freebsd32_aio_writev_args *uap) 3030 { 3031 3032 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITEV, 3033 &aiocb32_ops)); 3034 } 3035 3036 int 3037 freebsd32_aio_mlock(struct thread *td, struct freebsd32_aio_mlock_args *uap) 3038 { 3039 3040 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_MLOCK, 3041 &aiocb32_ops)); 3042 } 3043 3044 int 3045 freebsd32_aio_waitcomplete(struct thread *td, 3046 struct freebsd32_aio_waitcomplete_args *uap) 3047 { 3048 struct timespec32 ts32; 3049 struct timespec ts, *tsp; 3050 int error; 3051 3052 if (uap->timeout) { 3053 /* Get timespec struct. */ 3054 error = copyin(uap->timeout, &ts32, sizeof(ts32)); 3055 if (error) 3056 return (error); 3057 CP(ts32, ts, tv_sec); 3058 CP(ts32, ts, tv_nsec); 3059 tsp = &ts; 3060 } else 3061 tsp = NULL; 3062 3063 return (kern_aio_waitcomplete(td, (struct aiocb **)uap->aiocbp, tsp, 3064 &aiocb32_ops)); 3065 } 3066 3067 int 3068 freebsd32_aio_fsync(struct thread *td, struct freebsd32_aio_fsync_args *uap) 3069 { 3070 3071 return (kern_aio_fsync(td, uap->op, (struct aiocb *)uap->aiocbp, 3072 &aiocb32_ops)); 3073 } 3074 3075 #ifdef COMPAT_FREEBSD6 3076 int 3077 freebsd6_freebsd32_lio_listio(struct thread *td, 3078 struct freebsd6_freebsd32_lio_listio_args *uap) 3079 { 3080 struct aiocb **acb_list; 3081 struct sigevent *sigp, sig; 3082 struct osigevent32 osig; 3083 uint32_t *acb_list32; 3084 int error, i, nent; 3085 3086 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 3087 return (EINVAL); 3088 3089 nent = uap->nent; 3090 if (nent < 0 || nent > max_aio_queue_per_proc) 3091 return (EINVAL); 3092 3093 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 3094 error = copyin(uap->sig, &osig, sizeof(osig)); 3095 if (error) 3096 return (error); 3097 error = convert_old_sigevent32(&osig, &sig); 3098 if (error) 3099 return (error); 3100 sigp = &sig; 3101 } else 3102 sigp = NULL; 3103 3104 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK); 3105 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t)); 3106 if (error) { 3107 free(acb_list32, M_LIO); 3108 return (error); 3109 } 3110 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 3111 for (i = 0; i < nent; i++) 3112 acb_list[i] = PTRIN(acb_list32[i]); 3113 free(acb_list32, M_LIO); 3114 3115 error = kern_lio_listio(td, uap->mode, 3116 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp, 3117 &aiocb32_ops_osigevent); 3118 free(acb_list, M_LIO); 3119 return (error); 3120 } 3121 #endif 3122 3123 int 3124 freebsd32_lio_listio(struct thread *td, struct freebsd32_lio_listio_args *uap) 3125 { 3126 struct aiocb **acb_list; 3127 struct sigevent *sigp, sig; 3128 struct sigevent32 sig32; 3129 uint32_t *acb_list32; 3130 int error, i, nent; 3131 3132 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 3133 return (EINVAL); 3134 3135 nent = uap->nent; 3136 if (nent < 0 || nent > max_aio_queue_per_proc) 3137 return (EINVAL); 3138 3139 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 3140 error = copyin(uap->sig, &sig32, sizeof(sig32)); 3141 if (error) 3142 return (error); 3143 error = convert_sigevent32(&sig32, &sig); 3144 if (error) 3145 return (error); 3146 sigp = &sig; 3147 } else 3148 sigp = NULL; 3149 3150 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK); 3151 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t)); 3152 if (error) { 3153 free(acb_list32, M_LIO); 3154 return (error); 3155 } 3156 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 3157 for (i = 0; i < nent; i++) 3158 acb_list[i] = PTRIN(acb_list32[i]); 3159 free(acb_list32, M_LIO); 3160 3161 error = kern_lio_listio(td, uap->mode, 3162 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp, 3163 &aiocb32_ops); 3164 free(acb_list, M_LIO); 3165 return (error); 3166 } 3167 3168 #endif 3169