Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_aio.c
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1 /*- 2 * Copyright (c) 1997 John S. Dyson. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. John S. Dyson's name may not be used to endorse or promote products 10 * derived from this software without specific prior written permission. 11 * 12 * DISCLAIMER: This code isn't warranted to do anything useful. Anything 13 * bad that happens because of using this software isn't the responsibility 14 * of the author. This software is distributed AS-IS. 15 */ 16 17 /* 18 * This file contains support for the POSIX 1003.1B AIO/LIO facility. 19 */ 20 21 #include <sys/cdefs.h> 22 __FBSDID("$FreeBSD: releng/11.2/sys/kern/vfs_aio.c 328582 2018-01-30 00:52:22Z jhb $"); 23 24 #include "opt_compat.h" 25 26 #include <sys/param.h> 27 #include <sys/systm.h> 28 #include <sys/malloc.h> 29 #include <sys/bio.h> 30 #include <sys/buf.h> 31 #include <sys/capsicum.h> 32 #include <sys/eventhandler.h> 33 #include <sys/sysproto.h> 34 #include <sys/filedesc.h> 35 #include <sys/kernel.h> 36 #include <sys/module.h> 37 #include <sys/kthread.h> 38 #include <sys/fcntl.h> 39 #include <sys/file.h> 40 #include <sys/limits.h> 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <sys/unistd.h> 44 #include <sys/posix4.h> 45 #include <sys/proc.h> 46 #include <sys/resourcevar.h> 47 #include <sys/signalvar.h> 48 #include <sys/syscallsubr.h> 49 #include <sys/protosw.h> 50 #include <sys/rwlock.h> 51 #include <sys/sema.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/syscall.h> 55 #include <sys/sysent.h> 56 #include <sys/sysctl.h> 57 #include <sys/syslog.h> 58 #include <sys/sx.h> 59 #include <sys/taskqueue.h> 60 #include <sys/vnode.h> 61 #include <sys/conf.h> 62 #include <sys/event.h> 63 #include <sys/mount.h> 64 #include <geom/geom.h> 65 66 #include <machine/atomic.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_page.h> 70 #include <vm/vm_extern.h> 71 #include <vm/pmap.h> 72 #include <vm/vm_map.h> 73 #include <vm/vm_object.h> 74 #include <vm/uma.h> 75 #include <sys/aio.h> 76 77 /* 78 * Counter for allocating reference ids to new jobs. Wrapped to 1 on 79 * overflow. (XXX will be removed soon.) 80 */ 81 static u_long jobrefid; 82 83 /* 84 * Counter for aio_fsync. 85 */ 86 static uint64_t jobseqno; 87 88 #ifndef MAX_AIO_PER_PROC 89 #define MAX_AIO_PER_PROC 32 90 #endif 91 92 #ifndef MAX_AIO_QUEUE_PER_PROC 93 #define MAX_AIO_QUEUE_PER_PROC 256 94 #endif 95 96 #ifndef MAX_AIO_QUEUE 97 #define MAX_AIO_QUEUE 1024 /* Bigger than MAX_AIO_QUEUE_PER_PROC */ 98 #endif 99 100 #ifndef MAX_BUF_AIO 101 #define MAX_BUF_AIO 16 102 #endif 103 104 FEATURE(aio, "Asynchronous I/O"); 105 SYSCTL_DECL(_p1003_1b); 106 107 static MALLOC_DEFINE(M_LIO, "lio", "listio aio control block list"); 108 static MALLOC_DEFINE(M_AIOS, "aios", "aio_suspend aio control block list"); 109 110 static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, 111 "Async IO management"); 112 113 static int enable_aio_unsafe = 0; 114 SYSCTL_INT(_vfs_aio, OID_AUTO, enable_unsafe, CTLFLAG_RW, &enable_aio_unsafe, 0, 115 "Permit asynchronous IO on all file types, not just known-safe types"); 116 117 static unsigned int unsafe_warningcnt = 1; 118 SYSCTL_UINT(_vfs_aio, OID_AUTO, unsafe_warningcnt, CTLFLAG_RW, 119 &unsafe_warningcnt, 0, 120 "Warnings that will be triggered upon failed IO requests on unsafe files"); 121 122 static int max_aio_procs = MAX_AIO_PROCS; 123 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, CTLFLAG_RW, &max_aio_procs, 0, 124 "Maximum number of kernel processes to use for handling async IO "); 125 126 static int num_aio_procs = 0; 127 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, CTLFLAG_RD, &num_aio_procs, 0, 128 "Number of presently active kernel processes for async IO"); 129 130 /* 131 * The code will adjust the actual number of AIO processes towards this 132 * number when it gets a chance. 133 */ 134 static int target_aio_procs = TARGET_AIO_PROCS; 135 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 136 0, 137 "Preferred number of ready kernel processes for async IO"); 138 139 static int max_queue_count = MAX_AIO_QUEUE; 140 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, 141 "Maximum number of aio requests to queue, globally"); 142 143 static int num_queue_count = 0; 144 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, 145 "Number of queued aio requests"); 146 147 static int num_buf_aio = 0; 148 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, 149 "Number of aio requests presently handled by the buf subsystem"); 150 151 static int num_unmapped_aio = 0; 152 SYSCTL_INT(_vfs_aio, OID_AUTO, num_unmapped_aio, CTLFLAG_RD, &num_unmapped_aio, 153 0, 154 "Number of aio requests presently handled by unmapped I/O buffers"); 155 156 /* Number of async I/O processes in the process of being started */ 157 /* XXX This should be local to aio_aqueue() */ 158 static int num_aio_resv_start = 0; 159 160 static int aiod_lifetime; 161 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, 162 "Maximum lifetime for idle aiod"); 163 164 static int max_aio_per_proc = MAX_AIO_PER_PROC; 165 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 166 0, 167 "Maximum active aio requests per process"); 168 169 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; 170 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, 171 &max_aio_queue_per_proc, 0, 172 "Maximum queued aio requests per process"); 173 174 static int max_buf_aio = MAX_BUF_AIO; 175 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, 176 "Maximum buf aio requests per process"); 177 178 /* 179 * Though redundant with vfs.aio.max_aio_queue_per_proc, POSIX requires 180 * sysconf(3) to support AIO_LISTIO_MAX, and we implement that with 181 * vfs.aio.aio_listio_max. 182 */ 183 SYSCTL_INT(_p1003_1b, CTL_P1003_1B_AIO_LISTIO_MAX, aio_listio_max, 184 CTLFLAG_RD | CTLFLAG_CAPRD, &max_aio_queue_per_proc, 185 0, "Maximum aio requests for a single lio_listio call"); 186 187 #ifdef COMPAT_FREEBSD6 188 typedef struct oaiocb { 189 int aio_fildes; /* File descriptor */ 190 off_t aio_offset; /* File offset for I/O */ 191 volatile void *aio_buf; /* I/O buffer in process space */ 192 size_t aio_nbytes; /* Number of bytes for I/O */ 193 struct osigevent aio_sigevent; /* Signal to deliver */ 194 int aio_lio_opcode; /* LIO opcode */ 195 int aio_reqprio; /* Request priority -- ignored */ 196 struct __aiocb_private _aiocb_private; 197 } oaiocb_t; 198 #endif 199 200 /* 201 * Below is a key of locks used to protect each member of struct kaiocb 202 * aioliojob and kaioinfo and any backends. 203 * 204 * * - need not protected 205 * a - locked by kaioinfo lock 206 * b - locked by backend lock, the backend lock can be null in some cases, 207 * for example, BIO belongs to this type, in this case, proc lock is 208 * reused. 209 * c - locked by aio_job_mtx, the lock for the generic file I/O backend. 210 */ 211 212 /* 213 * If the routine that services an AIO request blocks while running in an 214 * AIO kernel process it can starve other I/O requests. BIO requests 215 * queued via aio_qphysio() complete in GEOM and do not use AIO kernel 216 * processes at all. Socket I/O requests use a separate pool of 217 * kprocs and also force non-blocking I/O. Other file I/O requests 218 * use the generic fo_read/fo_write operations which can block. The 219 * fsync and mlock operations can also block while executing. Ideally 220 * none of these requests would block while executing. 221 * 222 * Note that the service routines cannot toggle O_NONBLOCK in the file 223 * structure directly while handling a request due to races with 224 * userland threads. 225 */ 226 227 /* jobflags */ 228 #define KAIOCB_QUEUEING 0x01 229 #define KAIOCB_CANCELLED 0x02 230 #define KAIOCB_CANCELLING 0x04 231 #define KAIOCB_CHECKSYNC 0x08 232 #define KAIOCB_CLEARED 0x10 233 #define KAIOCB_FINISHED 0x20 234 235 /* 236 * AIO process info 237 */ 238 #define AIOP_FREE 0x1 /* proc on free queue */ 239 240 struct aioproc { 241 int aioprocflags; /* (c) AIO proc flags */ 242 TAILQ_ENTRY(aioproc) list; /* (c) list of processes */ 243 struct proc *aioproc; /* (*) the AIO proc */ 244 }; 245 246 /* 247 * data-structure for lio signal management 248 */ 249 struct aioliojob { 250 int lioj_flags; /* (a) listio flags */ 251 int lioj_count; /* (a) listio flags */ 252 int lioj_finished_count; /* (a) listio flags */ 253 struct sigevent lioj_signal; /* (a) signal on all I/O done */ 254 TAILQ_ENTRY(aioliojob) lioj_list; /* (a) lio list */ 255 struct knlist klist; /* (a) list of knotes */ 256 ksiginfo_t lioj_ksi; /* (a) Realtime signal info */ 257 }; 258 259 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ 260 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ 261 #define LIOJ_KEVENT_POSTED 0x4 /* kevent triggered */ 262 263 /* 264 * per process aio data structure 265 */ 266 struct kaioinfo { 267 struct mtx kaio_mtx; /* the lock to protect this struct */ 268 int kaio_flags; /* (a) per process kaio flags */ 269 int kaio_active_count; /* (c) number of currently used AIOs */ 270 int kaio_count; /* (a) size of AIO queue */ 271 int kaio_buffer_count; /* (a) number of physio buffers */ 272 TAILQ_HEAD(,kaiocb) kaio_all; /* (a) all AIOs in a process */ 273 TAILQ_HEAD(,kaiocb) kaio_done; /* (a) done queue for process */ 274 TAILQ_HEAD(,aioliojob) kaio_liojoblist; /* (a) list of lio jobs */ 275 TAILQ_HEAD(,kaiocb) kaio_jobqueue; /* (a) job queue for process */ 276 TAILQ_HEAD(,kaiocb) kaio_syncqueue; /* (a) queue for aio_fsync */ 277 TAILQ_HEAD(,kaiocb) kaio_syncready; /* (a) second q for aio_fsync */ 278 struct task kaio_task; /* (*) task to kick aio processes */ 279 struct task kaio_sync_task; /* (*) task to schedule fsync jobs */ 280 }; 281 282 #define AIO_LOCK(ki) mtx_lock(&(ki)->kaio_mtx) 283 #define AIO_UNLOCK(ki) mtx_unlock(&(ki)->kaio_mtx) 284 #define AIO_LOCK_ASSERT(ki, f) mtx_assert(&(ki)->kaio_mtx, (f)) 285 #define AIO_MTX(ki) (&(ki)->kaio_mtx) 286 287 #define KAIO_RUNDOWN 0x1 /* process is being run down */ 288 #define KAIO_WAKEUP 0x2 /* wakeup process when AIO completes */ 289 290 /* 291 * Operations used to interact with userland aio control blocks. 292 * Different ABIs provide their own operations. 293 */ 294 struct aiocb_ops { 295 int (*copyin)(struct aiocb *ujob, struct aiocb *kjob); 296 long (*fetch_status)(struct aiocb *ujob); 297 long (*fetch_error)(struct aiocb *ujob); 298 int (*store_status)(struct aiocb *ujob, long status); 299 int (*store_error)(struct aiocb *ujob, long error); 300 int (*store_kernelinfo)(struct aiocb *ujob, long jobref); 301 int (*store_aiocb)(struct aiocb **ujobp, struct aiocb *ujob); 302 }; 303 304 static TAILQ_HEAD(,aioproc) aio_freeproc; /* (c) Idle daemons */ 305 static struct sema aio_newproc_sem; 306 static struct mtx aio_job_mtx; 307 static TAILQ_HEAD(,kaiocb) aio_jobs; /* (c) Async job list */ 308 static struct unrhdr *aiod_unr; 309 310 void aio_init_aioinfo(struct proc *p); 311 static int aio_onceonly(void); 312 static int aio_free_entry(struct kaiocb *job); 313 static void aio_process_rw(struct kaiocb *job); 314 static void aio_process_sync(struct kaiocb *job); 315 static void aio_process_mlock(struct kaiocb *job); 316 static void aio_schedule_fsync(void *context, int pending); 317 static int aio_newproc(int *); 318 int aio_aqueue(struct thread *td, struct aiocb *ujob, 319 struct aioliojob *lio, int type, struct aiocb_ops *ops); 320 static int aio_queue_file(struct file *fp, struct kaiocb *job); 321 static void aio_physwakeup(struct bio *bp); 322 static void aio_proc_rundown(void *arg, struct proc *p); 323 static void aio_proc_rundown_exec(void *arg, struct proc *p, 324 struct image_params *imgp); 325 static int aio_qphysio(struct proc *p, struct kaiocb *job); 326 static void aio_daemon(void *param); 327 static void aio_bio_done_notify(struct proc *userp, struct kaiocb *job); 328 static bool aio_clear_cancel_function_locked(struct kaiocb *job); 329 static int aio_kick(struct proc *userp); 330 static void aio_kick_nowait(struct proc *userp); 331 static void aio_kick_helper(void *context, int pending); 332 static int filt_aioattach(struct knote *kn); 333 static void filt_aiodetach(struct knote *kn); 334 static int filt_aio(struct knote *kn, long hint); 335 static int filt_lioattach(struct knote *kn); 336 static void filt_liodetach(struct knote *kn); 337 static int filt_lio(struct knote *kn, long hint); 338 339 /* 340 * Zones for: 341 * kaio Per process async io info 342 * aiop async io process data 343 * aiocb async io jobs 344 * aiolio list io jobs 345 */ 346 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiolio_zone; 347 348 /* kqueue filters for aio */ 349 static struct filterops aio_filtops = { 350 .f_isfd = 0, 351 .f_attach = filt_aioattach, 352 .f_detach = filt_aiodetach, 353 .f_event = filt_aio, 354 }; 355 static struct filterops lio_filtops = { 356 .f_isfd = 0, 357 .f_attach = filt_lioattach, 358 .f_detach = filt_liodetach, 359 .f_event = filt_lio 360 }; 361 362 static eventhandler_tag exit_tag, exec_tag; 363 364 TASKQUEUE_DEFINE_THREAD(aiod_kick); 365 366 /* 367 * Main operations function for use as a kernel module. 368 */ 369 static int 370 aio_modload(struct module *module, int cmd, void *arg) 371 { 372 int error = 0; 373 374 switch (cmd) { 375 case MOD_LOAD: 376 aio_onceonly(); 377 break; 378 case MOD_SHUTDOWN: 379 break; 380 default: 381 error = EOPNOTSUPP; 382 break; 383 } 384 return (error); 385 } 386 387 static moduledata_t aio_mod = { 388 "aio", 389 &aio_modload, 390 NULL 391 }; 392 393 DECLARE_MODULE(aio, aio_mod, SI_SUB_VFS, SI_ORDER_ANY); 394 MODULE_VERSION(aio, 1); 395 396 /* 397 * Startup initialization 398 */ 399 static int 400 aio_onceonly(void) 401 { 402 403 exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL, 404 EVENTHANDLER_PRI_ANY); 405 exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown_exec, 406 NULL, EVENTHANDLER_PRI_ANY); 407 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops); 408 kqueue_add_filteropts(EVFILT_LIO, &lio_filtops); 409 TAILQ_INIT(&aio_freeproc); 410 sema_init(&aio_newproc_sem, 0, "aio_new_proc"); 411 mtx_init(&aio_job_mtx, "aio_job", NULL, MTX_DEF); 412 TAILQ_INIT(&aio_jobs); 413 aiod_unr = new_unrhdr(1, INT_MAX, NULL); 414 kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL, 415 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 416 aiop_zone = uma_zcreate("AIOP", sizeof(struct aioproc), NULL, 417 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 418 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct kaiocb), NULL, NULL, 419 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 420 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL, 421 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 422 aiod_lifetime = AIOD_LIFETIME_DEFAULT; 423 jobrefid = 1; 424 p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, _POSIX_ASYNCHRONOUS_IO); 425 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE); 426 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0); 427 428 return (0); 429 } 430 431 /* 432 * Init the per-process aioinfo structure. The aioinfo limits are set 433 * per-process for user limit (resource) management. 434 */ 435 void 436 aio_init_aioinfo(struct proc *p) 437 { 438 struct kaioinfo *ki; 439 440 ki = uma_zalloc(kaio_zone, M_WAITOK); 441 mtx_init(&ki->kaio_mtx, "aiomtx", NULL, MTX_DEF | MTX_NEW); 442 ki->kaio_flags = 0; 443 ki->kaio_active_count = 0; 444 ki->kaio_count = 0; 445 ki->kaio_buffer_count = 0; 446 TAILQ_INIT(&ki->kaio_all); 447 TAILQ_INIT(&ki->kaio_done); 448 TAILQ_INIT(&ki->kaio_jobqueue); 449 TAILQ_INIT(&ki->kaio_liojoblist); 450 TAILQ_INIT(&ki->kaio_syncqueue); 451 TAILQ_INIT(&ki->kaio_syncready); 452 TASK_INIT(&ki->kaio_task, 0, aio_kick_helper, p); 453 TASK_INIT(&ki->kaio_sync_task, 0, aio_schedule_fsync, ki); 454 PROC_LOCK(p); 455 if (p->p_aioinfo == NULL) { 456 p->p_aioinfo = ki; 457 PROC_UNLOCK(p); 458 } else { 459 PROC_UNLOCK(p); 460 mtx_destroy(&ki->kaio_mtx); 461 uma_zfree(kaio_zone, ki); 462 } 463 464 while (num_aio_procs < MIN(target_aio_procs, max_aio_procs)) 465 aio_newproc(NULL); 466 } 467 468 static int 469 aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi) 470 { 471 struct thread *td; 472 int error; 473 474 error = sigev_findtd(p, sigev, &td); 475 if (error) 476 return (error); 477 if (!KSI_ONQ(ksi)) { 478 ksiginfo_set_sigev(ksi, sigev); 479 ksi->ksi_code = SI_ASYNCIO; 480 ksi->ksi_flags |= KSI_EXT | KSI_INS; 481 tdsendsignal(p, td, ksi->ksi_signo, ksi); 482 } 483 PROC_UNLOCK(p); 484 return (error); 485 } 486 487 /* 488 * Free a job entry. Wait for completion if it is currently active, but don't 489 * delay forever. If we delay, we return a flag that says that we have to 490 * restart the queue scan. 491 */ 492 static int 493 aio_free_entry(struct kaiocb *job) 494 { 495 struct kaioinfo *ki; 496 struct aioliojob *lj; 497 struct proc *p; 498 499 p = job->userproc; 500 MPASS(curproc == p); 501 ki = p->p_aioinfo; 502 MPASS(ki != NULL); 503 504 AIO_LOCK_ASSERT(ki, MA_OWNED); 505 MPASS(job->jobflags & KAIOCB_FINISHED); 506 507 atomic_subtract_int(&num_queue_count, 1); 508 509 ki->kaio_count--; 510 MPASS(ki->kaio_count >= 0); 511 512 TAILQ_REMOVE(&ki->kaio_done, job, plist); 513 TAILQ_REMOVE(&ki->kaio_all, job, allist); 514 515 lj = job->lio; 516 if (lj) { 517 lj->lioj_count--; 518 lj->lioj_finished_count--; 519 520 if (lj->lioj_count == 0) { 521 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 522 /* lio is going away, we need to destroy any knotes */ 523 knlist_delete(&lj->klist, curthread, 1); 524 PROC_LOCK(p); 525 sigqueue_take(&lj->lioj_ksi); 526 PROC_UNLOCK(p); 527 uma_zfree(aiolio_zone, lj); 528 } 529 } 530 531 /* job is going away, we need to destroy any knotes */ 532 knlist_delete(&job->klist, curthread, 1); 533 PROC_LOCK(p); 534 sigqueue_take(&job->ksi); 535 PROC_UNLOCK(p); 536 537 AIO_UNLOCK(ki); 538 539 /* 540 * The thread argument here is used to find the owning process 541 * and is also passed to fo_close() which may pass it to various 542 * places such as devsw close() routines. Because of that, we 543 * need a thread pointer from the process owning the job that is 544 * persistent and won't disappear out from under us or move to 545 * another process. 546 * 547 * Currently, all the callers of this function call it to remove 548 * a kaiocb from the current process' job list either via a 549 * syscall or due to the current process calling exit() or 550 * execve(). Thus, we know that p == curproc. We also know that 551 * curthread can't exit since we are curthread. 552 * 553 * Therefore, we use curthread as the thread to pass to 554 * knlist_delete(). This does mean that it is possible for the 555 * thread pointer at close time to differ from the thread pointer 556 * at open time, but this is already true of file descriptors in 557 * a multithreaded process. 558 */ 559 if (job->fd_file) 560 fdrop(job->fd_file, curthread); 561 crfree(job->cred); 562 uma_zfree(aiocb_zone, job); 563 AIO_LOCK(ki); 564 565 return (0); 566 } 567 568 static void 569 aio_proc_rundown_exec(void *arg, struct proc *p, 570 struct image_params *imgp __unused) 571 { 572 aio_proc_rundown(arg, p); 573 } 574 575 static int 576 aio_cancel_job(struct proc *p, struct kaioinfo *ki, struct kaiocb *job) 577 { 578 aio_cancel_fn_t *func; 579 int cancelled; 580 581 AIO_LOCK_ASSERT(ki, MA_OWNED); 582 if (job->jobflags & (KAIOCB_CANCELLED | KAIOCB_FINISHED)) 583 return (0); 584 MPASS((job->jobflags & KAIOCB_CANCELLING) == 0); 585 job->jobflags |= KAIOCB_CANCELLED; 586 587 func = job->cancel_fn; 588 589 /* 590 * If there is no cancel routine, just leave the job marked as 591 * cancelled. The job should be in active use by a caller who 592 * should complete it normally or when it fails to install a 593 * cancel routine. 594 */ 595 if (func == NULL) 596 return (0); 597 598 /* 599 * Set the CANCELLING flag so that aio_complete() will defer 600 * completions of this job. This prevents the job from being 601 * freed out from under the cancel callback. After the 602 * callback any deferred completion (whether from the callback 603 * or any other source) will be completed. 604 */ 605 job->jobflags |= KAIOCB_CANCELLING; 606 AIO_UNLOCK(ki); 607 func(job); 608 AIO_LOCK(ki); 609 job->jobflags &= ~KAIOCB_CANCELLING; 610 if (job->jobflags & KAIOCB_FINISHED) { 611 cancelled = job->uaiocb._aiocb_private.error == ECANCELED; 612 TAILQ_REMOVE(&ki->kaio_jobqueue, job, plist); 613 aio_bio_done_notify(p, job); 614 } else { 615 /* 616 * The cancel callback might have scheduled an 617 * operation to cancel this request, but it is 618 * only counted as cancelled if the request is 619 * cancelled when the callback returns. 620 */ 621 cancelled = 0; 622 } 623 return (cancelled); 624 } 625 626 /* 627 * Rundown the jobs for a given process. 628 */ 629 static void 630 aio_proc_rundown(void *arg, struct proc *p) 631 { 632 struct kaioinfo *ki; 633 struct aioliojob *lj; 634 struct kaiocb *job, *jobn; 635 636 KASSERT(curthread->td_proc == p, 637 ("%s: called on non-curproc", __func__)); 638 ki = p->p_aioinfo; 639 if (ki == NULL) 640 return; 641 642 AIO_LOCK(ki); 643 ki->kaio_flags |= KAIO_RUNDOWN; 644 645 restart: 646 647 /* 648 * Try to cancel all pending requests. This code simulates 649 * aio_cancel on all pending I/O requests. 650 */ 651 TAILQ_FOREACH_SAFE(job, &ki->kaio_jobqueue, plist, jobn) { 652 aio_cancel_job(p, ki, job); 653 } 654 655 /* Wait for all running I/O to be finished */ 656 if (TAILQ_FIRST(&ki->kaio_jobqueue) || ki->kaio_active_count != 0) { 657 ki->kaio_flags |= KAIO_WAKEUP; 658 msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO, "aioprn", hz); 659 goto restart; 660 } 661 662 /* Free all completed I/O requests. */ 663 while ((job = TAILQ_FIRST(&ki->kaio_done)) != NULL) 664 aio_free_entry(job); 665 666 while ((lj = TAILQ_FIRST(&ki->kaio_liojoblist)) != NULL) { 667 if (lj->lioj_count == 0) { 668 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 669 knlist_delete(&lj->klist, curthread, 1); 670 PROC_LOCK(p); 671 sigqueue_take(&lj->lioj_ksi); 672 PROC_UNLOCK(p); 673 uma_zfree(aiolio_zone, lj); 674 } else { 675 panic("LIO job not cleaned up: C:%d, FC:%d\n", 676 lj->lioj_count, lj->lioj_finished_count); 677 } 678 } 679 AIO_UNLOCK(ki); 680 taskqueue_drain(taskqueue_aiod_kick, &ki->kaio_task); 681 taskqueue_drain(taskqueue_aiod_kick, &ki->kaio_sync_task); 682 mtx_destroy(&ki->kaio_mtx); 683 uma_zfree(kaio_zone, ki); 684 p->p_aioinfo = NULL; 685 } 686 687 /* 688 * Select a job to run (called by an AIO daemon). 689 */ 690 static struct kaiocb * 691 aio_selectjob(struct aioproc *aiop) 692 { 693 struct kaiocb *job; 694 struct kaioinfo *ki; 695 struct proc *userp; 696 697 mtx_assert(&aio_job_mtx, MA_OWNED); 698 restart: 699 TAILQ_FOREACH(job, &aio_jobs, list) { 700 userp = job->userproc; 701 ki = userp->p_aioinfo; 702 703 if (ki->kaio_active_count < max_aio_per_proc) { 704 TAILQ_REMOVE(&aio_jobs, job, list); 705 if (!aio_clear_cancel_function(job)) 706 goto restart; 707 708 /* Account for currently active jobs. */ 709 ki->kaio_active_count++; 710 break; 711 } 712 } 713 return (job); 714 } 715 716 /* 717 * Move all data to a permanent storage device. This code 718 * simulates the fsync syscall. 719 */ 720 static int 721 aio_fsync_vnode(struct thread *td, struct vnode *vp) 722 { 723 struct mount *mp; 724 int error; 725 726 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 727 goto drop; 728 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 729 if (vp->v_object != NULL) { 730 VM_OBJECT_WLOCK(vp->v_object); 731 vm_object_page_clean(vp->v_object, 0, 0, 0); 732 VM_OBJECT_WUNLOCK(vp->v_object); 733 } 734 error = VOP_FSYNC(vp, MNT_WAIT, td); 735 736 VOP_UNLOCK(vp, 0); 737 vn_finished_write(mp); 738 drop: 739 return (error); 740 } 741 742 /* 743 * The AIO processing activity for LIO_READ/LIO_WRITE. This is the code that 744 * does the I/O request for the non-physio version of the operations. The 745 * normal vn operations are used, and this code should work in all instances 746 * for every type of file, including pipes, sockets, fifos, and regular files. 747 * 748 * XXX I don't think it works well for socket, pipe, and fifo. 749 */ 750 static void 751 aio_process_rw(struct kaiocb *job) 752 { 753 struct ucred *td_savedcred; 754 struct thread *td; 755 struct aiocb *cb; 756 struct file *fp; 757 struct uio auio; 758 struct iovec aiov; 759 ssize_t cnt; 760 long msgsnd_st, msgsnd_end; 761 long msgrcv_st, msgrcv_end; 762 long oublock_st, oublock_end; 763 long inblock_st, inblock_end; 764 int error; 765 766 KASSERT(job->uaiocb.aio_lio_opcode == LIO_READ || 767 job->uaiocb.aio_lio_opcode == LIO_WRITE, 768 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode)); 769 770 aio_switch_vmspace(job); 771 td = curthread; 772 td_savedcred = td->td_ucred; 773 td->td_ucred = job->cred; 774 cb = &job->uaiocb; 775 fp = job->fd_file; 776 777 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf; 778 aiov.iov_len = cb->aio_nbytes; 779 780 auio.uio_iov = &aiov; 781 auio.uio_iovcnt = 1; 782 auio.uio_offset = cb->aio_offset; 783 auio.uio_resid = cb->aio_nbytes; 784 cnt = cb->aio_nbytes; 785 auio.uio_segflg = UIO_USERSPACE; 786 auio.uio_td = td; 787 788 msgrcv_st = td->td_ru.ru_msgrcv; 789 msgsnd_st = td->td_ru.ru_msgsnd; 790 inblock_st = td->td_ru.ru_inblock; 791 oublock_st = td->td_ru.ru_oublock; 792 793 /* 794 * aio_aqueue() acquires a reference to the file that is 795 * released in aio_free_entry(). 796 */ 797 if (cb->aio_lio_opcode == LIO_READ) { 798 auio.uio_rw = UIO_READ; 799 if (auio.uio_resid == 0) 800 error = 0; 801 else 802 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td); 803 } else { 804 if (fp->f_type == DTYPE_VNODE) 805 bwillwrite(); 806 auio.uio_rw = UIO_WRITE; 807 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td); 808 } 809 msgrcv_end = td->td_ru.ru_msgrcv; 810 msgsnd_end = td->td_ru.ru_msgsnd; 811 inblock_end = td->td_ru.ru_inblock; 812 oublock_end = td->td_ru.ru_oublock; 813 814 job->msgrcv = msgrcv_end - msgrcv_st; 815 job->msgsnd = msgsnd_end - msgsnd_st; 816 job->inblock = inblock_end - inblock_st; 817 job->outblock = oublock_end - oublock_st; 818 819 if ((error) && (auio.uio_resid != cnt)) { 820 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) 821 error = 0; 822 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) { 823 PROC_LOCK(job->userproc); 824 kern_psignal(job->userproc, SIGPIPE); 825 PROC_UNLOCK(job->userproc); 826 } 827 } 828 829 cnt -= auio.uio_resid; 830 td->td_ucred = td_savedcred; 831 if (error) 832 aio_complete(job, -1, error); 833 else 834 aio_complete(job, cnt, 0); 835 } 836 837 static void 838 aio_process_sync(struct kaiocb *job) 839 { 840 struct thread *td = curthread; 841 struct ucred *td_savedcred = td->td_ucred; 842 struct file *fp = job->fd_file; 843 int error = 0; 844 845 KASSERT(job->uaiocb.aio_lio_opcode == LIO_SYNC, 846 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode)); 847 848 td->td_ucred = job->cred; 849 if (fp->f_vnode != NULL) 850 error = aio_fsync_vnode(td, fp->f_vnode); 851 td->td_ucred = td_savedcred; 852 if (error) 853 aio_complete(job, -1, error); 854 else 855 aio_complete(job, 0, 0); 856 } 857 858 static void 859 aio_process_mlock(struct kaiocb *job) 860 { 861 struct aiocb *cb = &job->uaiocb; 862 int error; 863 864 KASSERT(job->uaiocb.aio_lio_opcode == LIO_MLOCK, 865 ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode)); 866 867 aio_switch_vmspace(job); 868 error = kern_mlock(job->userproc, job->cred, 869 __DEVOLATILE(uintptr_t, cb->aio_buf), cb->aio_nbytes); 870 aio_complete(job, error != 0 ? -1 : 0, error); 871 } 872 873 static void 874 aio_bio_done_notify(struct proc *userp, struct kaiocb *job) 875 { 876 struct aioliojob *lj; 877 struct kaioinfo *ki; 878 struct kaiocb *sjob, *sjobn; 879 int lj_done; 880 bool schedule_fsync; 881 882 ki = userp->p_aioinfo; 883 AIO_LOCK_ASSERT(ki, MA_OWNED); 884 lj = job->lio; 885 lj_done = 0; 886 if (lj) { 887 lj->lioj_finished_count++; 888 if (lj->lioj_count == lj->lioj_finished_count) 889 lj_done = 1; 890 } 891 TAILQ_INSERT_TAIL(&ki->kaio_done, job, plist); 892 MPASS(job->jobflags & KAIOCB_FINISHED); 893 894 if (ki->kaio_flags & KAIO_RUNDOWN) 895 goto notification_done; 896 897 if (job->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL || 898 job->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) 899 aio_sendsig(userp, &job->uaiocb.aio_sigevent, &job->ksi); 900 901 KNOTE_LOCKED(&job->klist, 1); 902 903 if (lj_done) { 904 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { 905 lj->lioj_flags |= LIOJ_KEVENT_POSTED; 906 KNOTE_LOCKED(&lj->klist, 1); 907 } 908 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) 909 == LIOJ_SIGNAL 910 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || 911 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) { 912 aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi); 913 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 914 } 915 } 916 917 notification_done: 918 if (job->jobflags & KAIOCB_CHECKSYNC) { 919 schedule_fsync = false; 920 TAILQ_FOREACH_SAFE(sjob, &ki->kaio_syncqueue, list, sjobn) { 921 if (job->fd_file != sjob->fd_file || 922 job->seqno >= sjob->seqno) 923 continue; 924 if (--sjob->pending > 0) 925 continue; 926 TAILQ_REMOVE(&ki->kaio_syncqueue, sjob, list); 927 if (!aio_clear_cancel_function_locked(sjob)) 928 continue; 929 TAILQ_INSERT_TAIL(&ki->kaio_syncready, sjob, list); 930 schedule_fsync = true; 931 } 932 if (schedule_fsync) 933 taskqueue_enqueue(taskqueue_aiod_kick, 934 &ki->kaio_sync_task); 935 } 936 if (ki->kaio_flags & KAIO_WAKEUP) { 937 ki->kaio_flags &= ~KAIO_WAKEUP; 938 wakeup(&userp->p_aioinfo); 939 } 940 } 941 942 static void 943 aio_schedule_fsync(void *context, int pending) 944 { 945 struct kaioinfo *ki; 946 struct kaiocb *job; 947 948 ki = context; 949 AIO_LOCK(ki); 950 while (!TAILQ_EMPTY(&ki->kaio_syncready)) { 951 job = TAILQ_FIRST(&ki->kaio_syncready); 952 TAILQ_REMOVE(&ki->kaio_syncready, job, list); 953 AIO_UNLOCK(ki); 954 aio_schedule(job, aio_process_sync); 955 AIO_LOCK(ki); 956 } 957 AIO_UNLOCK(ki); 958 } 959 960 bool 961 aio_cancel_cleared(struct kaiocb *job) 962 { 963 struct kaioinfo *ki; 964 965 /* 966 * The caller should hold the same queue lock held when 967 * aio_clear_cancel_function() was called and set this flag 968 * ensuring this check sees an up-to-date value. However, 969 * there is no way to assert that. 970 */ 971 ki = job->userproc->p_aioinfo; 972 return ((job->jobflags & KAIOCB_CLEARED) != 0); 973 } 974 975 static bool 976 aio_clear_cancel_function_locked(struct kaiocb *job) 977 { 978 979 AIO_LOCK_ASSERT(job->userproc->p_aioinfo, MA_OWNED); 980 MPASS(job->cancel_fn != NULL); 981 if (job->jobflags & KAIOCB_CANCELLING) { 982 job->jobflags |= KAIOCB_CLEARED; 983 return (false); 984 } 985 job->cancel_fn = NULL; 986 return (true); 987 } 988 989 bool 990 aio_clear_cancel_function(struct kaiocb *job) 991 { 992 struct kaioinfo *ki; 993 bool ret; 994 995 ki = job->userproc->p_aioinfo; 996 AIO_LOCK(ki); 997 ret = aio_clear_cancel_function_locked(job); 998 AIO_UNLOCK(ki); 999 return (ret); 1000 } 1001 1002 static bool 1003 aio_set_cancel_function_locked(struct kaiocb *job, aio_cancel_fn_t *func) 1004 { 1005 1006 AIO_LOCK_ASSERT(job->userproc->p_aioinfo, MA_OWNED); 1007 if (job->jobflags & KAIOCB_CANCELLED) 1008 return (false); 1009 job->cancel_fn = func; 1010 return (true); 1011 } 1012 1013 bool 1014 aio_set_cancel_function(struct kaiocb *job, aio_cancel_fn_t *func) 1015 { 1016 struct kaioinfo *ki; 1017 bool ret; 1018 1019 ki = job->userproc->p_aioinfo; 1020 AIO_LOCK(ki); 1021 ret = aio_set_cancel_function_locked(job, func); 1022 AIO_UNLOCK(ki); 1023 return (ret); 1024 } 1025 1026 void 1027 aio_complete(struct kaiocb *job, long status, int error) 1028 { 1029 struct kaioinfo *ki; 1030 struct proc *userp; 1031 1032 job->uaiocb._aiocb_private.error = error; 1033 job->uaiocb._aiocb_private.status = status; 1034 1035 userp = job->userproc; 1036 ki = userp->p_aioinfo; 1037 1038 AIO_LOCK(ki); 1039 KASSERT(!(job->jobflags & KAIOCB_FINISHED), 1040 ("duplicate aio_complete")); 1041 job->jobflags |= KAIOCB_FINISHED; 1042 if ((job->jobflags & (KAIOCB_QUEUEING | KAIOCB_CANCELLING)) == 0) { 1043 TAILQ_REMOVE(&ki->kaio_jobqueue, job, plist); 1044 aio_bio_done_notify(userp, job); 1045 } 1046 AIO_UNLOCK(ki); 1047 } 1048 1049 void 1050 aio_cancel(struct kaiocb *job) 1051 { 1052 1053 aio_complete(job, -1, ECANCELED); 1054 } 1055 1056 void 1057 aio_switch_vmspace(struct kaiocb *job) 1058 { 1059 1060 vmspace_switch_aio(job->userproc->p_vmspace); 1061 } 1062 1063 /* 1064 * The AIO daemon, most of the actual work is done in aio_process_*, 1065 * but the setup (and address space mgmt) is done in this routine. 1066 */ 1067 static void 1068 aio_daemon(void *_id) 1069 { 1070 struct kaiocb *job; 1071 struct aioproc *aiop; 1072 struct kaioinfo *ki; 1073 struct proc *p; 1074 struct vmspace *myvm; 1075 struct thread *td = curthread; 1076 int id = (intptr_t)_id; 1077 1078 /* 1079 * Grab an extra reference on the daemon's vmspace so that it 1080 * doesn't get freed by jobs that switch to a different 1081 * vmspace. 1082 */ 1083 p = td->td_proc; 1084 myvm = vmspace_acquire_ref(p); 1085 1086 KASSERT(p->p_textvp == NULL, ("kthread has a textvp")); 1087 1088 /* 1089 * Allocate and ready the aio control info. There is one aiop structure 1090 * per daemon. 1091 */ 1092 aiop = uma_zalloc(aiop_zone, M_WAITOK); 1093 aiop->aioproc = p; 1094 aiop->aioprocflags = 0; 1095 1096 /* 1097 * Wakeup parent process. (Parent sleeps to keep from blasting away 1098 * and creating too many daemons.) 1099 */ 1100 sema_post(&aio_newproc_sem); 1101 1102 mtx_lock(&aio_job_mtx); 1103 for (;;) { 1104 /* 1105 * Take daemon off of free queue 1106 */ 1107 if (aiop->aioprocflags & AIOP_FREE) { 1108 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1109 aiop->aioprocflags &= ~AIOP_FREE; 1110 } 1111 1112 /* 1113 * Check for jobs. 1114 */ 1115 while ((job = aio_selectjob(aiop)) != NULL) { 1116 mtx_unlock(&aio_job_mtx); 1117 1118 ki = job->userproc->p_aioinfo; 1119 job->handle_fn(job); 1120 1121 mtx_lock(&aio_job_mtx); 1122 /* Decrement the active job count. */ 1123 ki->kaio_active_count--; 1124 } 1125 1126 /* 1127 * Disconnect from user address space. 1128 */ 1129 if (p->p_vmspace != myvm) { 1130 mtx_unlock(&aio_job_mtx); 1131 vmspace_switch_aio(myvm); 1132 mtx_lock(&aio_job_mtx); 1133 /* 1134 * We have to restart to avoid race, we only sleep if 1135 * no job can be selected. 1136 */ 1137 continue; 1138 } 1139 1140 mtx_assert(&aio_job_mtx, MA_OWNED); 1141 1142 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 1143 aiop->aioprocflags |= AIOP_FREE; 1144 1145 /* 1146 * If daemon is inactive for a long time, allow it to exit, 1147 * thereby freeing resources. 1148 */ 1149 if (msleep(p, &aio_job_mtx, PRIBIO, "aiordy", 1150 aiod_lifetime) == EWOULDBLOCK && TAILQ_EMPTY(&aio_jobs) && 1151 (aiop->aioprocflags & AIOP_FREE) && 1152 num_aio_procs > target_aio_procs) 1153 break; 1154 } 1155 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1156 num_aio_procs--; 1157 mtx_unlock(&aio_job_mtx); 1158 uma_zfree(aiop_zone, aiop); 1159 free_unr(aiod_unr, id); 1160 vmspace_free(myvm); 1161 1162 KASSERT(p->p_vmspace == myvm, 1163 ("AIOD: bad vmspace for exiting daemon")); 1164 KASSERT(myvm->vm_refcnt > 1, 1165 ("AIOD: bad vm refcnt for exiting daemon: %d", myvm->vm_refcnt)); 1166 kproc_exit(0); 1167 } 1168 1169 /* 1170 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The 1171 * AIO daemon modifies its environment itself. 1172 */ 1173 static int 1174 aio_newproc(int *start) 1175 { 1176 int error; 1177 struct proc *p; 1178 int id; 1179 1180 id = alloc_unr(aiod_unr); 1181 error = kproc_create(aio_daemon, (void *)(intptr_t)id, &p, 1182 RFNOWAIT, 0, "aiod%d", id); 1183 if (error == 0) { 1184 /* 1185 * Wait until daemon is started. 1186 */ 1187 sema_wait(&aio_newproc_sem); 1188 mtx_lock(&aio_job_mtx); 1189 num_aio_procs++; 1190 if (start != NULL) 1191 (*start)--; 1192 mtx_unlock(&aio_job_mtx); 1193 } else { 1194 free_unr(aiod_unr, id); 1195 } 1196 return (error); 1197 } 1198 1199 /* 1200 * Try the high-performance, low-overhead physio method for eligible 1201 * VCHR devices. This method doesn't use an aio helper thread, and 1202 * thus has very low overhead. 1203 * 1204 * Assumes that the caller, aio_aqueue(), has incremented the file 1205 * structure's reference count, preventing its deallocation for the 1206 * duration of this call. 1207 */ 1208 static int 1209 aio_qphysio(struct proc *p, struct kaiocb *job) 1210 { 1211 struct aiocb *cb; 1212 struct file *fp; 1213 struct bio *bp; 1214 struct buf *pbuf; 1215 struct vnode *vp; 1216 struct cdevsw *csw; 1217 struct cdev *dev; 1218 struct kaioinfo *ki; 1219 int error, ref, poff; 1220 vm_prot_t prot; 1221 1222 cb = &job->uaiocb; 1223 fp = job->fd_file; 1224 1225 if (!(cb->aio_lio_opcode == LIO_WRITE || 1226 cb->aio_lio_opcode == LIO_READ)) 1227 return (-1); 1228 if (fp == NULL || fp->f_type != DTYPE_VNODE) 1229 return (-1); 1230 1231 vp = fp->f_vnode; 1232 if (vp->v_type != VCHR) 1233 return (-1); 1234 if (vp->v_bufobj.bo_bsize == 0) 1235 return (-1); 1236 if (cb->aio_nbytes % vp->v_bufobj.bo_bsize) 1237 return (-1); 1238 1239 ref = 0; 1240 csw = devvn_refthread(vp, &dev, &ref); 1241 if (csw == NULL) 1242 return (ENXIO); 1243 1244 if ((csw->d_flags & D_DISK) == 0) { 1245 error = -1; 1246 goto unref; 1247 } 1248 if (cb->aio_nbytes > dev->si_iosize_max) { 1249 error = -1; 1250 goto unref; 1251 } 1252 1253 ki = p->p_aioinfo; 1254 poff = (vm_offset_t)cb->aio_buf & PAGE_MASK; 1255 if ((dev->si_flags & SI_UNMAPPED) && unmapped_buf_allowed) { 1256 if (cb->aio_nbytes > MAXPHYS) { 1257 error = -1; 1258 goto unref; 1259 } 1260 1261 pbuf = NULL; 1262 } else { 1263 if (cb->aio_nbytes > MAXPHYS - poff) { 1264 error = -1; 1265 goto unref; 1266 } 1267 if (ki->kaio_buffer_count >= max_buf_aio) { 1268 error = EAGAIN; 1269 goto unref; 1270 } 1271 1272 job->pbuf = pbuf = (struct buf *)getpbuf(NULL); 1273 BUF_KERNPROC(pbuf); 1274 AIO_LOCK(ki); 1275 ki->kaio_buffer_count++; 1276 AIO_UNLOCK(ki); 1277 } 1278 job->bp = bp = g_alloc_bio(); 1279 1280 bp->bio_length = cb->aio_nbytes; 1281 bp->bio_bcount = cb->aio_nbytes; 1282 bp->bio_done = aio_physwakeup; 1283 bp->bio_data = (void *)(uintptr_t)cb->aio_buf; 1284 bp->bio_offset = cb->aio_offset; 1285 bp->bio_cmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ; 1286 bp->bio_dev = dev; 1287 bp->bio_caller1 = (void *)job; 1288 1289 prot = VM_PROT_READ; 1290 if (cb->aio_lio_opcode == LIO_READ) 1291 prot |= VM_PROT_WRITE; /* Less backwards than it looks */ 1292 job->npages = vm_fault_quick_hold_pages(&curproc->p_vmspace->vm_map, 1293 (vm_offset_t)bp->bio_data, bp->bio_length, prot, job->pages, 1294 nitems(job->pages)); 1295 if (job->npages < 0) { 1296 error = EFAULT; 1297 goto doerror; 1298 } 1299 if (pbuf != NULL) { 1300 pmap_qenter((vm_offset_t)pbuf->b_data, 1301 job->pages, job->npages); 1302 bp->bio_data = pbuf->b_data + poff; 1303 atomic_add_int(&num_buf_aio, 1); 1304 } else { 1305 bp->bio_ma = job->pages; 1306 bp->bio_ma_n = job->npages; 1307 bp->bio_ma_offset = poff; 1308 bp->bio_data = unmapped_buf; 1309 bp->bio_flags |= BIO_UNMAPPED; 1310 atomic_add_int(&num_unmapped_aio, 1); 1311 } 1312 1313 /* Perform transfer. */ 1314 csw->d_strategy(bp); 1315 dev_relthread(dev, ref); 1316 return (0); 1317 1318 doerror: 1319 if (pbuf != NULL) { 1320 AIO_LOCK(ki); 1321 ki->kaio_buffer_count--; 1322 AIO_UNLOCK(ki); 1323 relpbuf(pbuf, NULL); 1324 job->pbuf = NULL; 1325 } 1326 g_destroy_bio(bp); 1327 job->bp = NULL; 1328 unref: 1329 dev_relthread(dev, ref); 1330 return (error); 1331 } 1332 1333 #ifdef COMPAT_FREEBSD6 1334 static int 1335 convert_old_sigevent(struct osigevent *osig, struct sigevent *nsig) 1336 { 1337 1338 /* 1339 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are 1340 * supported by AIO with the old sigevent structure. 1341 */ 1342 nsig->sigev_notify = osig->sigev_notify; 1343 switch (nsig->sigev_notify) { 1344 case SIGEV_NONE: 1345 break; 1346 case SIGEV_SIGNAL: 1347 nsig->sigev_signo = osig->__sigev_u.__sigev_signo; 1348 break; 1349 case SIGEV_KEVENT: 1350 nsig->sigev_notify_kqueue = 1351 osig->__sigev_u.__sigev_notify_kqueue; 1352 nsig->sigev_value.sival_ptr = osig->sigev_value.sival_ptr; 1353 break; 1354 default: 1355 return (EINVAL); 1356 } 1357 return (0); 1358 } 1359 1360 static int 1361 aiocb_copyin_old_sigevent(struct aiocb *ujob, struct aiocb *kjob) 1362 { 1363 struct oaiocb *ojob; 1364 int error; 1365 1366 bzero(kjob, sizeof(struct aiocb)); 1367 error = copyin(ujob, kjob, sizeof(struct oaiocb)); 1368 if (error) 1369 return (error); 1370 ojob = (struct oaiocb *)kjob; 1371 return (convert_old_sigevent(&ojob->aio_sigevent, &kjob->aio_sigevent)); 1372 } 1373 #endif 1374 1375 static int 1376 aiocb_copyin(struct aiocb *ujob, struct aiocb *kjob) 1377 { 1378 1379 return (copyin(ujob, kjob, sizeof(struct aiocb))); 1380 } 1381 1382 static long 1383 aiocb_fetch_status(struct aiocb *ujob) 1384 { 1385 1386 return (fuword(&ujob->_aiocb_private.status)); 1387 } 1388 1389 static long 1390 aiocb_fetch_error(struct aiocb *ujob) 1391 { 1392 1393 return (fuword(&ujob->_aiocb_private.error)); 1394 } 1395 1396 static int 1397 aiocb_store_status(struct aiocb *ujob, long status) 1398 { 1399 1400 return (suword(&ujob->_aiocb_private.status, status)); 1401 } 1402 1403 static int 1404 aiocb_store_error(struct aiocb *ujob, long error) 1405 { 1406 1407 return (suword(&ujob->_aiocb_private.error, error)); 1408 } 1409 1410 static int 1411 aiocb_store_kernelinfo(struct aiocb *ujob, long jobref) 1412 { 1413 1414 return (suword(&ujob->_aiocb_private.kernelinfo, jobref)); 1415 } 1416 1417 static int 1418 aiocb_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob) 1419 { 1420 1421 return (suword(ujobp, (long)ujob)); 1422 } 1423 1424 static struct aiocb_ops aiocb_ops = { 1425 .copyin = aiocb_copyin, 1426 .fetch_status = aiocb_fetch_status, 1427 .fetch_error = aiocb_fetch_error, 1428 .store_status = aiocb_store_status, 1429 .store_error = aiocb_store_error, 1430 .store_kernelinfo = aiocb_store_kernelinfo, 1431 .store_aiocb = aiocb_store_aiocb, 1432 }; 1433 1434 #ifdef COMPAT_FREEBSD6 1435 static struct aiocb_ops aiocb_ops_osigevent = { 1436 .copyin = aiocb_copyin_old_sigevent, 1437 .fetch_status = aiocb_fetch_status, 1438 .fetch_error = aiocb_fetch_error, 1439 .store_status = aiocb_store_status, 1440 .store_error = aiocb_store_error, 1441 .store_kernelinfo = aiocb_store_kernelinfo, 1442 .store_aiocb = aiocb_store_aiocb, 1443 }; 1444 #endif 1445 1446 /* 1447 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR 1448 * technique is done in this code. 1449 */ 1450 int 1451 aio_aqueue(struct thread *td, struct aiocb *ujob, struct aioliojob *lj, 1452 int type, struct aiocb_ops *ops) 1453 { 1454 struct proc *p = td->td_proc; 1455 cap_rights_t rights; 1456 struct file *fp; 1457 struct kaiocb *job; 1458 struct kaioinfo *ki; 1459 struct kevent kev; 1460 int opcode; 1461 int error; 1462 int fd, kqfd; 1463 int jid; 1464 u_short evflags; 1465 1466 if (p->p_aioinfo == NULL) 1467 aio_init_aioinfo(p); 1468 1469 ki = p->p_aioinfo; 1470 1471 ops->store_status(ujob, -1); 1472 ops->store_error(ujob, 0); 1473 ops->store_kernelinfo(ujob, -1); 1474 1475 if (num_queue_count >= max_queue_count || 1476 ki->kaio_count >= max_aio_queue_per_proc) { 1477 ops->store_error(ujob, EAGAIN); 1478 return (EAGAIN); 1479 } 1480 1481 job = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO); 1482 knlist_init_mtx(&job->klist, AIO_MTX(ki)); 1483 1484 error = ops->copyin(ujob, &job->uaiocb); 1485 if (error) { 1486 ops->store_error(ujob, error); 1487 uma_zfree(aiocb_zone, job); 1488 return (error); 1489 } 1490 1491 if (job->uaiocb.aio_nbytes > IOSIZE_MAX) { 1492 uma_zfree(aiocb_zone, job); 1493 return (EINVAL); 1494 } 1495 1496 if (job->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT && 1497 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL && 1498 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID && 1499 job->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) { 1500 ops->store_error(ujob, EINVAL); 1501 uma_zfree(aiocb_zone, job); 1502 return (EINVAL); 1503 } 1504 1505 if ((job->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL || 1506 job->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) && 1507 !_SIG_VALID(job->uaiocb.aio_sigevent.sigev_signo)) { 1508 uma_zfree(aiocb_zone, job); 1509 return (EINVAL); 1510 } 1511 1512 ksiginfo_init(&job->ksi); 1513 1514 /* Save userspace address of the job info. */ 1515 job->ujob = ujob; 1516 1517 /* Get the opcode. */ 1518 if (type != LIO_NOP) 1519 job->uaiocb.aio_lio_opcode = type; 1520 opcode = job->uaiocb.aio_lio_opcode; 1521 1522 /* 1523 * Validate the opcode and fetch the file object for the specified 1524 * file descriptor. 1525 * 1526 * XXXRW: Moved the opcode validation up here so that we don't 1527 * retrieve a file descriptor without knowing what the capabiltity 1528 * should be. 1529 */ 1530 fd = job->uaiocb.aio_fildes; 1531 switch (opcode) { 1532 case LIO_WRITE: 1533 error = fget_write(td, fd, 1534 cap_rights_init(&rights, CAP_PWRITE), &fp); 1535 break; 1536 case LIO_READ: 1537 error = fget_read(td, fd, 1538 cap_rights_init(&rights, CAP_PREAD), &fp); 1539 break; 1540 case LIO_SYNC: 1541 error = fget(td, fd, cap_rights_init(&rights, CAP_FSYNC), &fp); 1542 break; 1543 case LIO_MLOCK: 1544 fp = NULL; 1545 break; 1546 case LIO_NOP: 1547 error = fget(td, fd, cap_rights_init(&rights), &fp); 1548 break; 1549 default: 1550 error = EINVAL; 1551 } 1552 if (error) { 1553 uma_zfree(aiocb_zone, job); 1554 ops->store_error(ujob, error); 1555 return (error); 1556 } 1557 1558 if (opcode == LIO_SYNC && fp->f_vnode == NULL) { 1559 error = EINVAL; 1560 goto aqueue_fail; 1561 } 1562 1563 if ((opcode == LIO_READ || opcode == LIO_WRITE) && 1564 job->uaiocb.aio_offset < 0 && 1565 (fp->f_vnode == NULL || fp->f_vnode->v_type != VCHR)) { 1566 error = EINVAL; 1567 goto aqueue_fail; 1568 } 1569 1570 job->fd_file = fp; 1571 1572 mtx_lock(&aio_job_mtx); 1573 jid = jobrefid++; 1574 job->seqno = jobseqno++; 1575 mtx_unlock(&aio_job_mtx); 1576 error = ops->store_kernelinfo(ujob, jid); 1577 if (error) { 1578 error = EINVAL; 1579 goto aqueue_fail; 1580 } 1581 job->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid; 1582 1583 if (opcode == LIO_NOP) { 1584 fdrop(fp, td); 1585 uma_zfree(aiocb_zone, job); 1586 return (0); 1587 } 1588 1589 if (job->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT) 1590 goto no_kqueue; 1591 evflags = job->uaiocb.aio_sigevent.sigev_notify_kevent_flags; 1592 if ((evflags & ~(EV_CLEAR | EV_DISPATCH | EV_ONESHOT)) != 0) { 1593 error = EINVAL; 1594 goto aqueue_fail; 1595 } 1596 kqfd = job->uaiocb.aio_sigevent.sigev_notify_kqueue; 1597 kev.ident = (uintptr_t)job->ujob; 1598 kev.filter = EVFILT_AIO; 1599 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1 | evflags; 1600 kev.data = (intptr_t)job; 1601 kev.udata = job->uaiocb.aio_sigevent.sigev_value.sival_ptr; 1602 error = kqfd_register(kqfd, &kev, td, 1); 1603 if (error) 1604 goto aqueue_fail; 1605 1606 no_kqueue: 1607 1608 ops->store_error(ujob, EINPROGRESS); 1609 job->uaiocb._aiocb_private.error = EINPROGRESS; 1610 job->userproc = p; 1611 job->cred = crhold(td->td_ucred); 1612 job->jobflags = KAIOCB_QUEUEING; 1613 job->lio = lj; 1614 1615 if (opcode == LIO_MLOCK) { 1616 aio_schedule(job, aio_process_mlock); 1617 error = 0; 1618 } else if (fp->f_ops->fo_aio_queue == NULL) 1619 error = aio_queue_file(fp, job); 1620 else 1621 error = fo_aio_queue(fp, job); 1622 if (error) 1623 goto aqueue_fail; 1624 1625 AIO_LOCK(ki); 1626 job->jobflags &= ~KAIOCB_QUEUEING; 1627 TAILQ_INSERT_TAIL(&ki->kaio_all, job, allist); 1628 ki->kaio_count++; 1629 if (lj) 1630 lj->lioj_count++; 1631 atomic_add_int(&num_queue_count, 1); 1632 if (job->jobflags & KAIOCB_FINISHED) { 1633 /* 1634 * The queue callback completed the request synchronously. 1635 * The bulk of the completion is deferred in that case 1636 * until this point. 1637 */ 1638 aio_bio_done_notify(p, job); 1639 } else 1640 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, job, plist); 1641 AIO_UNLOCK(ki); 1642 return (0); 1643 1644 aqueue_fail: 1645 knlist_delete(&job->klist, curthread, 0); 1646 if (fp) 1647 fdrop(fp, td); 1648 uma_zfree(aiocb_zone, job); 1649 ops->store_error(ujob, error); 1650 return (error); 1651 } 1652 1653 static void 1654 aio_cancel_daemon_job(struct kaiocb *job) 1655 { 1656 1657 mtx_lock(&aio_job_mtx); 1658 if (!aio_cancel_cleared(job)) 1659 TAILQ_REMOVE(&aio_jobs, job, list); 1660 mtx_unlock(&aio_job_mtx); 1661 aio_cancel(job); 1662 } 1663 1664 void 1665 aio_schedule(struct kaiocb *job, aio_handle_fn_t *func) 1666 { 1667 1668 mtx_lock(&aio_job_mtx); 1669 if (!aio_set_cancel_function(job, aio_cancel_daemon_job)) { 1670 mtx_unlock(&aio_job_mtx); 1671 aio_cancel(job); 1672 return; 1673 } 1674 job->handle_fn = func; 1675 TAILQ_INSERT_TAIL(&aio_jobs, job, list); 1676 aio_kick_nowait(job->userproc); 1677 mtx_unlock(&aio_job_mtx); 1678 } 1679 1680 static void 1681 aio_cancel_sync(struct kaiocb *job) 1682 { 1683 struct kaioinfo *ki; 1684 1685 ki = job->userproc->p_aioinfo; 1686 AIO_LOCK(ki); 1687 if (!aio_cancel_cleared(job)) 1688 TAILQ_REMOVE(&ki->kaio_syncqueue, job, list); 1689 AIO_UNLOCK(ki); 1690 aio_cancel(job); 1691 } 1692 1693 int 1694 aio_queue_file(struct file *fp, struct kaiocb *job) 1695 { 1696 struct aioliojob *lj; 1697 struct kaioinfo *ki; 1698 struct kaiocb *job2; 1699 struct vnode *vp; 1700 struct mount *mp; 1701 int error; 1702 bool safe; 1703 1704 lj = job->lio; 1705 ki = job->userproc->p_aioinfo; 1706 error = aio_qphysio(job->userproc, job); 1707 if (error >= 0) 1708 return (error); 1709 safe = false; 1710 if (fp->f_type == DTYPE_VNODE) { 1711 vp = fp->f_vnode; 1712 if (vp->v_type == VREG || vp->v_type == VDIR) { 1713 mp = fp->f_vnode->v_mount; 1714 if (mp == NULL || (mp->mnt_flag & MNT_LOCAL) != 0) 1715 safe = true; 1716 } 1717 } 1718 if (!(safe || enable_aio_unsafe)) { 1719 counted_warning(&unsafe_warningcnt, 1720 "is attempting to use unsafe AIO requests"); 1721 return (EOPNOTSUPP); 1722 } 1723 1724 switch (job->uaiocb.aio_lio_opcode) { 1725 case LIO_READ: 1726 case LIO_WRITE: 1727 aio_schedule(job, aio_process_rw); 1728 error = 0; 1729 break; 1730 case LIO_SYNC: 1731 AIO_LOCK(ki); 1732 TAILQ_FOREACH(job2, &ki->kaio_jobqueue, plist) { 1733 if (job2->fd_file == job->fd_file && 1734 job2->uaiocb.aio_lio_opcode != LIO_SYNC && 1735 job2->seqno < job->seqno) { 1736 job2->jobflags |= KAIOCB_CHECKSYNC; 1737 job->pending++; 1738 } 1739 } 1740 if (job->pending != 0) { 1741 if (!aio_set_cancel_function_locked(job, 1742 aio_cancel_sync)) { 1743 AIO_UNLOCK(ki); 1744 aio_cancel(job); 1745 return (0); 1746 } 1747 TAILQ_INSERT_TAIL(&ki->kaio_syncqueue, job, list); 1748 AIO_UNLOCK(ki); 1749 return (0); 1750 } 1751 AIO_UNLOCK(ki); 1752 aio_schedule(job, aio_process_sync); 1753 error = 0; 1754 break; 1755 default: 1756 error = EINVAL; 1757 } 1758 return (error); 1759 } 1760 1761 static void 1762 aio_kick_nowait(struct proc *userp) 1763 { 1764 struct kaioinfo *ki = userp->p_aioinfo; 1765 struct aioproc *aiop; 1766 1767 mtx_assert(&aio_job_mtx, MA_OWNED); 1768 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1769 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1770 aiop->aioprocflags &= ~AIOP_FREE; 1771 wakeup(aiop->aioproc); 1772 } else if (num_aio_resv_start + num_aio_procs < max_aio_procs && 1773 ki->kaio_active_count + num_aio_resv_start < max_aio_per_proc) { 1774 taskqueue_enqueue(taskqueue_aiod_kick, &ki->kaio_task); 1775 } 1776 } 1777 1778 static int 1779 aio_kick(struct proc *userp) 1780 { 1781 struct kaioinfo *ki = userp->p_aioinfo; 1782 struct aioproc *aiop; 1783 int error, ret = 0; 1784 1785 mtx_assert(&aio_job_mtx, MA_OWNED); 1786 retryproc: 1787 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1788 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1789 aiop->aioprocflags &= ~AIOP_FREE; 1790 wakeup(aiop->aioproc); 1791 } else if (num_aio_resv_start + num_aio_procs < max_aio_procs && 1792 ki->kaio_active_count + num_aio_resv_start < max_aio_per_proc) { 1793 num_aio_resv_start++; 1794 mtx_unlock(&aio_job_mtx); 1795 error = aio_newproc(&num_aio_resv_start); 1796 mtx_lock(&aio_job_mtx); 1797 if (error) { 1798 num_aio_resv_start--; 1799 goto retryproc; 1800 } 1801 } else { 1802 ret = -1; 1803 } 1804 return (ret); 1805 } 1806 1807 static void 1808 aio_kick_helper(void *context, int pending) 1809 { 1810 struct proc *userp = context; 1811 1812 mtx_lock(&aio_job_mtx); 1813 while (--pending >= 0) { 1814 if (aio_kick(userp)) 1815 break; 1816 } 1817 mtx_unlock(&aio_job_mtx); 1818 } 1819 1820 /* 1821 * Support the aio_return system call, as a side-effect, kernel resources are 1822 * released. 1823 */ 1824 static int 1825 kern_aio_return(struct thread *td, struct aiocb *ujob, struct aiocb_ops *ops) 1826 { 1827 struct proc *p = td->td_proc; 1828 struct kaiocb *job; 1829 struct kaioinfo *ki; 1830 long status, error; 1831 1832 ki = p->p_aioinfo; 1833 if (ki == NULL) 1834 return (EINVAL); 1835 AIO_LOCK(ki); 1836 TAILQ_FOREACH(job, &ki->kaio_done, plist) { 1837 if (job->ujob == ujob) 1838 break; 1839 } 1840 if (job != NULL) { 1841 MPASS(job->jobflags & KAIOCB_FINISHED); 1842 status = job->uaiocb._aiocb_private.status; 1843 error = job->uaiocb._aiocb_private.error; 1844 td->td_retval[0] = status; 1845 td->td_ru.ru_oublock += job->outblock; 1846 td->td_ru.ru_inblock += job->inblock; 1847 td->td_ru.ru_msgsnd += job->msgsnd; 1848 td->td_ru.ru_msgrcv += job->msgrcv; 1849 aio_free_entry(job); 1850 AIO_UNLOCK(ki); 1851 ops->store_error(ujob, error); 1852 ops->store_status(ujob, status); 1853 } else { 1854 error = EINVAL; 1855 AIO_UNLOCK(ki); 1856 } 1857 return (error); 1858 } 1859 1860 int 1861 sys_aio_return(struct thread *td, struct aio_return_args *uap) 1862 { 1863 1864 return (kern_aio_return(td, uap->aiocbp, &aiocb_ops)); 1865 } 1866 1867 /* 1868 * Allow a process to wakeup when any of the I/O requests are completed. 1869 */ 1870 static int 1871 kern_aio_suspend(struct thread *td, int njoblist, struct aiocb **ujoblist, 1872 struct timespec *ts) 1873 { 1874 struct proc *p = td->td_proc; 1875 struct timeval atv; 1876 struct kaioinfo *ki; 1877 struct kaiocb *firstjob, *job; 1878 int error, i, timo; 1879 1880 timo = 0; 1881 if (ts) { 1882 if (ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000) 1883 return (EINVAL); 1884 1885 TIMESPEC_TO_TIMEVAL(&atv, ts); 1886 if (itimerfix(&atv)) 1887 return (EINVAL); 1888 timo = tvtohz(&atv); 1889 } 1890 1891 ki = p->p_aioinfo; 1892 if (ki == NULL) 1893 return (EAGAIN); 1894 1895 if (njoblist == 0) 1896 return (0); 1897 1898 AIO_LOCK(ki); 1899 for (;;) { 1900 firstjob = NULL; 1901 error = 0; 1902 TAILQ_FOREACH(job, &ki->kaio_all, allist) { 1903 for (i = 0; i < njoblist; i++) { 1904 if (job->ujob == ujoblist[i]) { 1905 if (firstjob == NULL) 1906 firstjob = job; 1907 if (job->jobflags & KAIOCB_FINISHED) 1908 goto RETURN; 1909 } 1910 } 1911 } 1912 /* All tasks were finished. */ 1913 if (firstjob == NULL) 1914 break; 1915 1916 ki->kaio_flags |= KAIO_WAKEUP; 1917 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH, 1918 "aiospn", timo); 1919 if (error == ERESTART) 1920 error = EINTR; 1921 if (error) 1922 break; 1923 } 1924 RETURN: 1925 AIO_UNLOCK(ki); 1926 return (error); 1927 } 1928 1929 int 1930 sys_aio_suspend(struct thread *td, struct aio_suspend_args *uap) 1931 { 1932 struct timespec ts, *tsp; 1933 struct aiocb **ujoblist; 1934 int error; 1935 1936 if (uap->nent < 0 || uap->nent > max_aio_queue_per_proc) 1937 return (EINVAL); 1938 1939 if (uap->timeout) { 1940 /* Get timespec struct. */ 1941 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) 1942 return (error); 1943 tsp = &ts; 1944 } else 1945 tsp = NULL; 1946 1947 ujoblist = malloc(uap->nent * sizeof(ujoblist[0]), M_AIOS, M_WAITOK); 1948 error = copyin(uap->aiocbp, ujoblist, uap->nent * sizeof(ujoblist[0])); 1949 if (error == 0) 1950 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp); 1951 free(ujoblist, M_AIOS); 1952 return (error); 1953 } 1954 1955 /* 1956 * aio_cancel cancels any non-physio aio operations not currently in 1957 * progress. 1958 */ 1959 int 1960 sys_aio_cancel(struct thread *td, struct aio_cancel_args *uap) 1961 { 1962 struct proc *p = td->td_proc; 1963 struct kaioinfo *ki; 1964 struct kaiocb *job, *jobn; 1965 struct file *fp; 1966 cap_rights_t rights; 1967 int error; 1968 int cancelled = 0; 1969 int notcancelled = 0; 1970 struct vnode *vp; 1971 1972 /* Lookup file object. */ 1973 error = fget(td, uap->fd, cap_rights_init(&rights), &fp); 1974 if (error) 1975 return (error); 1976 1977 ki = p->p_aioinfo; 1978 if (ki == NULL) 1979 goto done; 1980 1981 if (fp->f_type == DTYPE_VNODE) { 1982 vp = fp->f_vnode; 1983 if (vn_isdisk(vp, &error)) { 1984 fdrop(fp, td); 1985 td->td_retval[0] = AIO_NOTCANCELED; 1986 return (0); 1987 } 1988 } 1989 1990 AIO_LOCK(ki); 1991 TAILQ_FOREACH_SAFE(job, &ki->kaio_jobqueue, plist, jobn) { 1992 if ((uap->fd == job->uaiocb.aio_fildes) && 1993 ((uap->aiocbp == NULL) || 1994 (uap->aiocbp == job->ujob))) { 1995 if (aio_cancel_job(p, ki, job)) { 1996 cancelled++; 1997 } else { 1998 notcancelled++; 1999 } 2000 if (uap->aiocbp != NULL) 2001 break; 2002 } 2003 } 2004 AIO_UNLOCK(ki); 2005 2006 done: 2007 fdrop(fp, td); 2008 2009 if (uap->aiocbp != NULL) { 2010 if (cancelled) { 2011 td->td_retval[0] = AIO_CANCELED; 2012 return (0); 2013 } 2014 } 2015 2016 if (notcancelled) { 2017 td->td_retval[0] = AIO_NOTCANCELED; 2018 return (0); 2019 } 2020 2021 if (cancelled) { 2022 td->td_retval[0] = AIO_CANCELED; 2023 return (0); 2024 } 2025 2026 td->td_retval[0] = AIO_ALLDONE; 2027 2028 return (0); 2029 } 2030 2031 /* 2032 * aio_error is implemented in the kernel level for compatibility purposes 2033 * only. For a user mode async implementation, it would be best to do it in 2034 * a userland subroutine. 2035 */ 2036 static int 2037 kern_aio_error(struct thread *td, struct aiocb *ujob, struct aiocb_ops *ops) 2038 { 2039 struct proc *p = td->td_proc; 2040 struct kaiocb *job; 2041 struct kaioinfo *ki; 2042 int status; 2043 2044 ki = p->p_aioinfo; 2045 if (ki == NULL) { 2046 td->td_retval[0] = EINVAL; 2047 return (0); 2048 } 2049 2050 AIO_LOCK(ki); 2051 TAILQ_FOREACH(job, &ki->kaio_all, allist) { 2052 if (job->ujob == ujob) { 2053 if (job->jobflags & KAIOCB_FINISHED) 2054 td->td_retval[0] = 2055 job->uaiocb._aiocb_private.error; 2056 else 2057 td->td_retval[0] = EINPROGRESS; 2058 AIO_UNLOCK(ki); 2059 return (0); 2060 } 2061 } 2062 AIO_UNLOCK(ki); 2063 2064 /* 2065 * Hack for failure of aio_aqueue. 2066 */ 2067 status = ops->fetch_status(ujob); 2068 if (status == -1) { 2069 td->td_retval[0] = ops->fetch_error(ujob); 2070 return (0); 2071 } 2072 2073 td->td_retval[0] = EINVAL; 2074 return (0); 2075 } 2076 2077 int 2078 sys_aio_error(struct thread *td, struct aio_error_args *uap) 2079 { 2080 2081 return (kern_aio_error(td, uap->aiocbp, &aiocb_ops)); 2082 } 2083 2084 /* syscall - asynchronous read from a file (REALTIME) */ 2085 #ifdef COMPAT_FREEBSD6 2086 int 2087 freebsd6_aio_read(struct thread *td, struct freebsd6_aio_read_args *uap) 2088 { 2089 2090 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 2091 &aiocb_ops_osigevent)); 2092 } 2093 #endif 2094 2095 int 2096 sys_aio_read(struct thread *td, struct aio_read_args *uap) 2097 { 2098 2099 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, &aiocb_ops)); 2100 } 2101 2102 /* syscall - asynchronous write to a file (REALTIME) */ 2103 #ifdef COMPAT_FREEBSD6 2104 int 2105 freebsd6_aio_write(struct thread *td, struct freebsd6_aio_write_args *uap) 2106 { 2107 2108 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 2109 &aiocb_ops_osigevent)); 2110 } 2111 #endif 2112 2113 int 2114 sys_aio_write(struct thread *td, struct aio_write_args *uap) 2115 { 2116 2117 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, &aiocb_ops)); 2118 } 2119 2120 int 2121 sys_aio_mlock(struct thread *td, struct aio_mlock_args *uap) 2122 { 2123 2124 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_MLOCK, &aiocb_ops)); 2125 } 2126 2127 static int 2128 kern_lio_listio(struct thread *td, int mode, struct aiocb * const *uacb_list, 2129 struct aiocb **acb_list, int nent, struct sigevent *sig, 2130 struct aiocb_ops *ops) 2131 { 2132 struct proc *p = td->td_proc; 2133 struct aiocb *job; 2134 struct kaioinfo *ki; 2135 struct aioliojob *lj; 2136 struct kevent kev; 2137 int error; 2138 int nerror; 2139 int i; 2140 2141 if ((mode != LIO_NOWAIT) && (mode != LIO_WAIT)) 2142 return (EINVAL); 2143 2144 if (nent < 0 || nent > max_aio_queue_per_proc) 2145 return (EINVAL); 2146 2147 if (p->p_aioinfo == NULL) 2148 aio_init_aioinfo(p); 2149 2150 ki = p->p_aioinfo; 2151 2152 lj = uma_zalloc(aiolio_zone, M_WAITOK); 2153 lj->lioj_flags = 0; 2154 lj->lioj_count = 0; 2155 lj->lioj_finished_count = 0; 2156 knlist_init_mtx(&lj->klist, AIO_MTX(ki)); 2157 ksiginfo_init(&lj->lioj_ksi); 2158 2159 /* 2160 * Setup signal. 2161 */ 2162 if (sig && (mode == LIO_NOWAIT)) { 2163 bcopy(sig, &lj->lioj_signal, sizeof(lj->lioj_signal)); 2164 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { 2165 /* Assume only new style KEVENT */ 2166 kev.filter = EVFILT_LIO; 2167 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; 2168 kev.ident = (uintptr_t)uacb_list; /* something unique */ 2169 kev.data = (intptr_t)lj; 2170 /* pass user defined sigval data */ 2171 kev.udata = lj->lioj_signal.sigev_value.sival_ptr; 2172 error = kqfd_register( 2173 lj->lioj_signal.sigev_notify_kqueue, &kev, td, 1); 2174 if (error) { 2175 uma_zfree(aiolio_zone, lj); 2176 return (error); 2177 } 2178 } else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) { 2179 ; 2180 } else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || 2181 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) { 2182 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { 2183 uma_zfree(aiolio_zone, lj); 2184 return EINVAL; 2185 } 2186 lj->lioj_flags |= LIOJ_SIGNAL; 2187 } else { 2188 uma_zfree(aiolio_zone, lj); 2189 return EINVAL; 2190 } 2191 } 2192 2193 AIO_LOCK(ki); 2194 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); 2195 /* 2196 * Add extra aiocb count to avoid the lio to be freed 2197 * by other threads doing aio_waitcomplete or aio_return, 2198 * and prevent event from being sent until we have queued 2199 * all tasks. 2200 */ 2201 lj->lioj_count = 1; 2202 AIO_UNLOCK(ki); 2203 2204 /* 2205 * Get pointers to the list of I/O requests. 2206 */ 2207 nerror = 0; 2208 for (i = 0; i < nent; i++) { 2209 job = acb_list[i]; 2210 if (job != NULL) { 2211 error = aio_aqueue(td, job, lj, LIO_NOP, ops); 2212 if (error != 0) 2213 nerror++; 2214 } 2215 } 2216 2217 error = 0; 2218 AIO_LOCK(ki); 2219 if (mode == LIO_WAIT) { 2220 while (lj->lioj_count - 1 != lj->lioj_finished_count) { 2221 ki->kaio_flags |= KAIO_WAKEUP; 2222 error = msleep(&p->p_aioinfo, AIO_MTX(ki), 2223 PRIBIO | PCATCH, "aiospn", 0); 2224 if (error == ERESTART) 2225 error = EINTR; 2226 if (error) 2227 break; 2228 } 2229 } else { 2230 if (lj->lioj_count - 1 == lj->lioj_finished_count) { 2231 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { 2232 lj->lioj_flags |= LIOJ_KEVENT_POSTED; 2233 KNOTE_LOCKED(&lj->klist, 1); 2234 } 2235 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) 2236 == LIOJ_SIGNAL 2237 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || 2238 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) { 2239 aio_sendsig(p, &lj->lioj_signal, 2240 &lj->lioj_ksi); 2241 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2242 } 2243 } 2244 } 2245 lj->lioj_count--; 2246 if (lj->lioj_count == 0) { 2247 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 2248 knlist_delete(&lj->klist, curthread, 1); 2249 PROC_LOCK(p); 2250 sigqueue_take(&lj->lioj_ksi); 2251 PROC_UNLOCK(p); 2252 AIO_UNLOCK(ki); 2253 uma_zfree(aiolio_zone, lj); 2254 } else 2255 AIO_UNLOCK(ki); 2256 2257 if (nerror) 2258 return (EIO); 2259 return (error); 2260 } 2261 2262 /* syscall - list directed I/O (REALTIME) */ 2263 #ifdef COMPAT_FREEBSD6 2264 int 2265 freebsd6_lio_listio(struct thread *td, struct freebsd6_lio_listio_args *uap) 2266 { 2267 struct aiocb **acb_list; 2268 struct sigevent *sigp, sig; 2269 struct osigevent osig; 2270 int error, nent; 2271 2272 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 2273 return (EINVAL); 2274 2275 nent = uap->nent; 2276 if (nent < 0 || nent > max_aio_queue_per_proc) 2277 return (EINVAL); 2278 2279 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2280 error = copyin(uap->sig, &osig, sizeof(osig)); 2281 if (error) 2282 return (error); 2283 error = convert_old_sigevent(&osig, &sig); 2284 if (error) 2285 return (error); 2286 sigp = &sig; 2287 } else 2288 sigp = NULL; 2289 2290 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 2291 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0])); 2292 if (error == 0) 2293 error = kern_lio_listio(td, uap->mode, 2294 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp, 2295 &aiocb_ops_osigevent); 2296 free(acb_list, M_LIO); 2297 return (error); 2298 } 2299 #endif 2300 2301 /* syscall - list directed I/O (REALTIME) */ 2302 int 2303 sys_lio_listio(struct thread *td, struct lio_listio_args *uap) 2304 { 2305 struct aiocb **acb_list; 2306 struct sigevent *sigp, sig; 2307 int error, nent; 2308 2309 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 2310 return (EINVAL); 2311 2312 nent = uap->nent; 2313 if (nent < 0 || nent > max_aio_queue_per_proc) 2314 return (EINVAL); 2315 2316 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2317 error = copyin(uap->sig, &sig, sizeof(sig)); 2318 if (error) 2319 return (error); 2320 sigp = &sig; 2321 } else 2322 sigp = NULL; 2323 2324 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 2325 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0])); 2326 if (error == 0) 2327 error = kern_lio_listio(td, uap->mode, uap->acb_list, acb_list, 2328 nent, sigp, &aiocb_ops); 2329 free(acb_list, M_LIO); 2330 return (error); 2331 } 2332 2333 static void 2334 aio_physwakeup(struct bio *bp) 2335 { 2336 struct kaiocb *job = (struct kaiocb *)bp->bio_caller1; 2337 struct proc *userp; 2338 struct kaioinfo *ki; 2339 size_t nbytes; 2340 int error, nblks; 2341 2342 /* Release mapping into kernel space. */ 2343 userp = job->userproc; 2344 ki = userp->p_aioinfo; 2345 if (job->pbuf) { 2346 pmap_qremove((vm_offset_t)job->pbuf->b_data, job->npages); 2347 relpbuf(job->pbuf, NULL); 2348 job->pbuf = NULL; 2349 atomic_subtract_int(&num_buf_aio, 1); 2350 AIO_LOCK(ki); 2351 ki->kaio_buffer_count--; 2352 AIO_UNLOCK(ki); 2353 } else 2354 atomic_subtract_int(&num_unmapped_aio, 1); 2355 vm_page_unhold_pages(job->pages, job->npages); 2356 2357 bp = job->bp; 2358 job->bp = NULL; 2359 nbytes = job->uaiocb.aio_nbytes - bp->bio_resid; 2360 error = 0; 2361 if (bp->bio_flags & BIO_ERROR) 2362 error = bp->bio_error; 2363 nblks = btodb(nbytes); 2364 if (job->uaiocb.aio_lio_opcode == LIO_WRITE) 2365 job->outblock += nblks; 2366 else 2367 job->inblock += nblks; 2368 2369 if (error) 2370 aio_complete(job, -1, error); 2371 else 2372 aio_complete(job, nbytes, 0); 2373 2374 g_destroy_bio(bp); 2375 } 2376 2377 /* syscall - wait for the next completion of an aio request */ 2378 static int 2379 kern_aio_waitcomplete(struct thread *td, struct aiocb **ujobp, 2380 struct timespec *ts, struct aiocb_ops *ops) 2381 { 2382 struct proc *p = td->td_proc; 2383 struct timeval atv; 2384 struct kaioinfo *ki; 2385 struct kaiocb *job; 2386 struct aiocb *ujob; 2387 long error, status; 2388 int timo; 2389 2390 ops->store_aiocb(ujobp, NULL); 2391 2392 if (ts == NULL) { 2393 timo = 0; 2394 } else if (ts->tv_sec == 0 && ts->tv_nsec == 0) { 2395 timo = -1; 2396 } else { 2397 if ((ts->tv_nsec < 0) || (ts->tv_nsec >= 1000000000)) 2398 return (EINVAL); 2399 2400 TIMESPEC_TO_TIMEVAL(&atv, ts); 2401 if (itimerfix(&atv)) 2402 return (EINVAL); 2403 timo = tvtohz(&atv); 2404 } 2405 2406 if (p->p_aioinfo == NULL) 2407 aio_init_aioinfo(p); 2408 ki = p->p_aioinfo; 2409 2410 error = 0; 2411 job = NULL; 2412 AIO_LOCK(ki); 2413 while ((job = TAILQ_FIRST(&ki->kaio_done)) == NULL) { 2414 if (timo == -1) { 2415 error = EWOULDBLOCK; 2416 break; 2417 } 2418 ki->kaio_flags |= KAIO_WAKEUP; 2419 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH, 2420 "aiowc", timo); 2421 if (timo && error == ERESTART) 2422 error = EINTR; 2423 if (error) 2424 break; 2425 } 2426 2427 if (job != NULL) { 2428 MPASS(job->jobflags & KAIOCB_FINISHED); 2429 ujob = job->ujob; 2430 status = job->uaiocb._aiocb_private.status; 2431 error = job->uaiocb._aiocb_private.error; 2432 td->td_retval[0] = status; 2433 td->td_ru.ru_oublock += job->outblock; 2434 td->td_ru.ru_inblock += job->inblock; 2435 td->td_ru.ru_msgsnd += job->msgsnd; 2436 td->td_ru.ru_msgrcv += job->msgrcv; 2437 aio_free_entry(job); 2438 AIO_UNLOCK(ki); 2439 ops->store_aiocb(ujobp, ujob); 2440 ops->store_error(ujob, error); 2441 ops->store_status(ujob, status); 2442 } else 2443 AIO_UNLOCK(ki); 2444 2445 return (error); 2446 } 2447 2448 int 2449 sys_aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap) 2450 { 2451 struct timespec ts, *tsp; 2452 int error; 2453 2454 if (uap->timeout) { 2455 /* Get timespec struct. */ 2456 error = copyin(uap->timeout, &ts, sizeof(ts)); 2457 if (error) 2458 return (error); 2459 tsp = &ts; 2460 } else 2461 tsp = NULL; 2462 2463 return (kern_aio_waitcomplete(td, uap->aiocbp, tsp, &aiocb_ops)); 2464 } 2465 2466 static int 2467 kern_aio_fsync(struct thread *td, int op, struct aiocb *ujob, 2468 struct aiocb_ops *ops) 2469 { 2470 2471 if (op != O_SYNC) /* XXX lack of O_DSYNC */ 2472 return (EINVAL); 2473 return (aio_aqueue(td, ujob, NULL, LIO_SYNC, ops)); 2474 } 2475 2476 int 2477 sys_aio_fsync(struct thread *td, struct aio_fsync_args *uap) 2478 { 2479 2480 return (kern_aio_fsync(td, uap->op, uap->aiocbp, &aiocb_ops)); 2481 } 2482 2483 /* kqueue attach function */ 2484 static int 2485 filt_aioattach(struct knote *kn) 2486 { 2487 struct kaiocb *job = (struct kaiocb *)kn->kn_sdata; 2488 2489 /* 2490 * The job pointer must be validated before using it, so 2491 * registration is restricted to the kernel; the user cannot 2492 * set EV_FLAG1. 2493 */ 2494 if ((kn->kn_flags & EV_FLAG1) == 0) 2495 return (EPERM); 2496 kn->kn_ptr.p_aio = job; 2497 kn->kn_flags &= ~EV_FLAG1; 2498 2499 knlist_add(&job->klist, kn, 0); 2500 2501 return (0); 2502 } 2503 2504 /* kqueue detach function */ 2505 static void 2506 filt_aiodetach(struct knote *kn) 2507 { 2508 struct knlist *knl; 2509 2510 knl = &kn->kn_ptr.p_aio->klist; 2511 knl->kl_lock(knl->kl_lockarg); 2512 if (!knlist_empty(knl)) 2513 knlist_remove(knl, kn, 1); 2514 knl->kl_unlock(knl->kl_lockarg); 2515 } 2516 2517 /* kqueue filter function */ 2518 /*ARGSUSED*/ 2519 static int 2520 filt_aio(struct knote *kn, long hint) 2521 { 2522 struct kaiocb *job = kn->kn_ptr.p_aio; 2523 2524 kn->kn_data = job->uaiocb._aiocb_private.error; 2525 if (!(job->jobflags & KAIOCB_FINISHED)) 2526 return (0); 2527 kn->kn_flags |= EV_EOF; 2528 return (1); 2529 } 2530 2531 /* kqueue attach function */ 2532 static int 2533 filt_lioattach(struct knote *kn) 2534 { 2535 struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata; 2536 2537 /* 2538 * The aioliojob pointer must be validated before using it, so 2539 * registration is restricted to the kernel; the user cannot 2540 * set EV_FLAG1. 2541 */ 2542 if ((kn->kn_flags & EV_FLAG1) == 0) 2543 return (EPERM); 2544 kn->kn_ptr.p_lio = lj; 2545 kn->kn_flags &= ~EV_FLAG1; 2546 2547 knlist_add(&lj->klist, kn, 0); 2548 2549 return (0); 2550 } 2551 2552 /* kqueue detach function */ 2553 static void 2554 filt_liodetach(struct knote *kn) 2555 { 2556 struct knlist *knl; 2557 2558 knl = &kn->kn_ptr.p_lio->klist; 2559 knl->kl_lock(knl->kl_lockarg); 2560 if (!knlist_empty(knl)) 2561 knlist_remove(knl, kn, 1); 2562 knl->kl_unlock(knl->kl_lockarg); 2563 } 2564 2565 /* kqueue filter function */ 2566 /*ARGSUSED*/ 2567 static int 2568 filt_lio(struct knote *kn, long hint) 2569 { 2570 struct aioliojob * lj = kn->kn_ptr.p_lio; 2571 2572 return (lj->lioj_flags & LIOJ_KEVENT_POSTED); 2573 } 2574 2575 #ifdef COMPAT_FREEBSD32 2576 #include <sys/mount.h> 2577 #include <sys/socket.h> 2578 #include <compat/freebsd32/freebsd32.h> 2579 #include <compat/freebsd32/freebsd32_proto.h> 2580 #include <compat/freebsd32/freebsd32_signal.h> 2581 #include <compat/freebsd32/freebsd32_syscall.h> 2582 #include <compat/freebsd32/freebsd32_util.h> 2583 2584 struct __aiocb_private32 { 2585 int32_t status; 2586 int32_t error; 2587 uint32_t kernelinfo; 2588 }; 2589 2590 #ifdef COMPAT_FREEBSD6 2591 typedef struct oaiocb32 { 2592 int aio_fildes; /* File descriptor */ 2593 uint64_t aio_offset __packed; /* File offset for I/O */ 2594 uint32_t aio_buf; /* I/O buffer in process space */ 2595 uint32_t aio_nbytes; /* Number of bytes for I/O */ 2596 struct osigevent32 aio_sigevent; /* Signal to deliver */ 2597 int aio_lio_opcode; /* LIO opcode */ 2598 int aio_reqprio; /* Request priority -- ignored */ 2599 struct __aiocb_private32 _aiocb_private; 2600 } oaiocb32_t; 2601 #endif 2602 2603 typedef struct aiocb32 { 2604 int32_t aio_fildes; /* File descriptor */ 2605 uint64_t aio_offset __packed; /* File offset for I/O */ 2606 uint32_t aio_buf; /* I/O buffer in process space */ 2607 uint32_t aio_nbytes; /* Number of bytes for I/O */ 2608 int __spare__[2]; 2609 uint32_t __spare2__; 2610 int aio_lio_opcode; /* LIO opcode */ 2611 int aio_reqprio; /* Request priority -- ignored */ 2612 struct __aiocb_private32 _aiocb_private; 2613 struct sigevent32 aio_sigevent; /* Signal to deliver */ 2614 } aiocb32_t; 2615 2616 #ifdef COMPAT_FREEBSD6 2617 static int 2618 convert_old_sigevent32(struct osigevent32 *osig, struct sigevent *nsig) 2619 { 2620 2621 /* 2622 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are 2623 * supported by AIO with the old sigevent structure. 2624 */ 2625 CP(*osig, *nsig, sigev_notify); 2626 switch (nsig->sigev_notify) { 2627 case SIGEV_NONE: 2628 break; 2629 case SIGEV_SIGNAL: 2630 nsig->sigev_signo = osig->__sigev_u.__sigev_signo; 2631 break; 2632 case SIGEV_KEVENT: 2633 nsig->sigev_notify_kqueue = 2634 osig->__sigev_u.__sigev_notify_kqueue; 2635 PTRIN_CP(*osig, *nsig, sigev_value.sival_ptr); 2636 break; 2637 default: 2638 return (EINVAL); 2639 } 2640 return (0); 2641 } 2642 2643 static int 2644 aiocb32_copyin_old_sigevent(struct aiocb *ujob, struct aiocb *kjob) 2645 { 2646 struct oaiocb32 job32; 2647 int error; 2648 2649 bzero(kjob, sizeof(struct aiocb)); 2650 error = copyin(ujob, &job32, sizeof(job32)); 2651 if (error) 2652 return (error); 2653 2654 CP(job32, *kjob, aio_fildes); 2655 CP(job32, *kjob, aio_offset); 2656 PTRIN_CP(job32, *kjob, aio_buf); 2657 CP(job32, *kjob, aio_nbytes); 2658 CP(job32, *kjob, aio_lio_opcode); 2659 CP(job32, *kjob, aio_reqprio); 2660 CP(job32, *kjob, _aiocb_private.status); 2661 CP(job32, *kjob, _aiocb_private.error); 2662 PTRIN_CP(job32, *kjob, _aiocb_private.kernelinfo); 2663 return (convert_old_sigevent32(&job32.aio_sigevent, 2664 &kjob->aio_sigevent)); 2665 } 2666 #endif 2667 2668 static int 2669 aiocb32_copyin(struct aiocb *ujob, struct aiocb *kjob) 2670 { 2671 struct aiocb32 job32; 2672 int error; 2673 2674 error = copyin(ujob, &job32, sizeof(job32)); 2675 if (error) 2676 return (error); 2677 CP(job32, *kjob, aio_fildes); 2678 CP(job32, *kjob, aio_offset); 2679 PTRIN_CP(job32, *kjob, aio_buf); 2680 CP(job32, *kjob, aio_nbytes); 2681 CP(job32, *kjob, aio_lio_opcode); 2682 CP(job32, *kjob, aio_reqprio); 2683 CP(job32, *kjob, _aiocb_private.status); 2684 CP(job32, *kjob, _aiocb_private.error); 2685 PTRIN_CP(job32, *kjob, _aiocb_private.kernelinfo); 2686 return (convert_sigevent32(&job32.aio_sigevent, &kjob->aio_sigevent)); 2687 } 2688 2689 static long 2690 aiocb32_fetch_status(struct aiocb *ujob) 2691 { 2692 struct aiocb32 *ujob32; 2693 2694 ujob32 = (struct aiocb32 *)ujob; 2695 return (fuword32(&ujob32->_aiocb_private.status)); 2696 } 2697 2698 static long 2699 aiocb32_fetch_error(struct aiocb *ujob) 2700 { 2701 struct aiocb32 *ujob32; 2702 2703 ujob32 = (struct aiocb32 *)ujob; 2704 return (fuword32(&ujob32->_aiocb_private.error)); 2705 } 2706 2707 static int 2708 aiocb32_store_status(struct aiocb *ujob, long status) 2709 { 2710 struct aiocb32 *ujob32; 2711 2712 ujob32 = (struct aiocb32 *)ujob; 2713 return (suword32(&ujob32->_aiocb_private.status, status)); 2714 } 2715 2716 static int 2717 aiocb32_store_error(struct aiocb *ujob, long error) 2718 { 2719 struct aiocb32 *ujob32; 2720 2721 ujob32 = (struct aiocb32 *)ujob; 2722 return (suword32(&ujob32->_aiocb_private.error, error)); 2723 } 2724 2725 static int 2726 aiocb32_store_kernelinfo(struct aiocb *ujob, long jobref) 2727 { 2728 struct aiocb32 *ujob32; 2729 2730 ujob32 = (struct aiocb32 *)ujob; 2731 return (suword32(&ujob32->_aiocb_private.kernelinfo, jobref)); 2732 } 2733 2734 static int 2735 aiocb32_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob) 2736 { 2737 2738 return (suword32(ujobp, (long)ujob)); 2739 } 2740 2741 static struct aiocb_ops aiocb32_ops = { 2742 .copyin = aiocb32_copyin, 2743 .fetch_status = aiocb32_fetch_status, 2744 .fetch_error = aiocb32_fetch_error, 2745 .store_status = aiocb32_store_status, 2746 .store_error = aiocb32_store_error, 2747 .store_kernelinfo = aiocb32_store_kernelinfo, 2748 .store_aiocb = aiocb32_store_aiocb, 2749 }; 2750 2751 #ifdef COMPAT_FREEBSD6 2752 static struct aiocb_ops aiocb32_ops_osigevent = { 2753 .copyin = aiocb32_copyin_old_sigevent, 2754 .fetch_status = aiocb32_fetch_status, 2755 .fetch_error = aiocb32_fetch_error, 2756 .store_status = aiocb32_store_status, 2757 .store_error = aiocb32_store_error, 2758 .store_kernelinfo = aiocb32_store_kernelinfo, 2759 .store_aiocb = aiocb32_store_aiocb, 2760 }; 2761 #endif 2762 2763 int 2764 freebsd32_aio_return(struct thread *td, struct freebsd32_aio_return_args *uap) 2765 { 2766 2767 return (kern_aio_return(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops)); 2768 } 2769 2770 int 2771 freebsd32_aio_suspend(struct thread *td, struct freebsd32_aio_suspend_args *uap) 2772 { 2773 struct timespec32 ts32; 2774 struct timespec ts, *tsp; 2775 struct aiocb **ujoblist; 2776 uint32_t *ujoblist32; 2777 int error, i; 2778 2779 if (uap->nent < 0 || uap->nent > max_aio_queue_per_proc) 2780 return (EINVAL); 2781 2782 if (uap->timeout) { 2783 /* Get timespec struct. */ 2784 if ((error = copyin(uap->timeout, &ts32, sizeof(ts32))) != 0) 2785 return (error); 2786 CP(ts32, ts, tv_sec); 2787 CP(ts32, ts, tv_nsec); 2788 tsp = &ts; 2789 } else 2790 tsp = NULL; 2791 2792 ujoblist = malloc(uap->nent * sizeof(ujoblist[0]), M_AIOS, M_WAITOK); 2793 ujoblist32 = (uint32_t *)ujoblist; 2794 error = copyin(uap->aiocbp, ujoblist32, uap->nent * 2795 sizeof(ujoblist32[0])); 2796 if (error == 0) { 2797 for (i = uap->nent - 1; i >= 0; i--) 2798 ujoblist[i] = PTRIN(ujoblist32[i]); 2799 2800 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp); 2801 } 2802 free(ujoblist, M_AIOS); 2803 return (error); 2804 } 2805 2806 int 2807 freebsd32_aio_error(struct thread *td, struct freebsd32_aio_error_args *uap) 2808 { 2809 2810 return (kern_aio_error(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops)); 2811 } 2812 2813 #ifdef COMPAT_FREEBSD6 2814 int 2815 freebsd6_freebsd32_aio_read(struct thread *td, 2816 struct freebsd6_freebsd32_aio_read_args *uap) 2817 { 2818 2819 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 2820 &aiocb32_ops_osigevent)); 2821 } 2822 #endif 2823 2824 int 2825 freebsd32_aio_read(struct thread *td, struct freebsd32_aio_read_args *uap) 2826 { 2827 2828 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 2829 &aiocb32_ops)); 2830 } 2831 2832 #ifdef COMPAT_FREEBSD6 2833 int 2834 freebsd6_freebsd32_aio_write(struct thread *td, 2835 struct freebsd6_freebsd32_aio_write_args *uap) 2836 { 2837 2838 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 2839 &aiocb32_ops_osigevent)); 2840 } 2841 #endif 2842 2843 int 2844 freebsd32_aio_write(struct thread *td, struct freebsd32_aio_write_args *uap) 2845 { 2846 2847 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 2848 &aiocb32_ops)); 2849 } 2850 2851 int 2852 freebsd32_aio_mlock(struct thread *td, struct freebsd32_aio_mlock_args *uap) 2853 { 2854 2855 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_MLOCK, 2856 &aiocb32_ops)); 2857 } 2858 2859 int 2860 freebsd32_aio_waitcomplete(struct thread *td, 2861 struct freebsd32_aio_waitcomplete_args *uap) 2862 { 2863 struct timespec32 ts32; 2864 struct timespec ts, *tsp; 2865 int error; 2866 2867 if (uap->timeout) { 2868 /* Get timespec struct. */ 2869 error = copyin(uap->timeout, &ts32, sizeof(ts32)); 2870 if (error) 2871 return (error); 2872 CP(ts32, ts, tv_sec); 2873 CP(ts32, ts, tv_nsec); 2874 tsp = &ts; 2875 } else 2876 tsp = NULL; 2877 2878 return (kern_aio_waitcomplete(td, (struct aiocb **)uap->aiocbp, tsp, 2879 &aiocb32_ops)); 2880 } 2881 2882 int 2883 freebsd32_aio_fsync(struct thread *td, struct freebsd32_aio_fsync_args *uap) 2884 { 2885 2886 return (kern_aio_fsync(td, uap->op, (struct aiocb *)uap->aiocbp, 2887 &aiocb32_ops)); 2888 } 2889 2890 #ifdef COMPAT_FREEBSD6 2891 int 2892 freebsd6_freebsd32_lio_listio(struct thread *td, 2893 struct freebsd6_freebsd32_lio_listio_args *uap) 2894 { 2895 struct aiocb **acb_list; 2896 struct sigevent *sigp, sig; 2897 struct osigevent32 osig; 2898 uint32_t *acb_list32; 2899 int error, i, nent; 2900 2901 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 2902 return (EINVAL); 2903 2904 nent = uap->nent; 2905 if (nent < 0 || nent > max_aio_queue_per_proc) 2906 return (EINVAL); 2907 2908 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2909 error = copyin(uap->sig, &osig, sizeof(osig)); 2910 if (error) 2911 return (error); 2912 error = convert_old_sigevent32(&osig, &sig); 2913 if (error) 2914 return (error); 2915 sigp = &sig; 2916 } else 2917 sigp = NULL; 2918 2919 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK); 2920 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t)); 2921 if (error) { 2922 free(acb_list32, M_LIO); 2923 return (error); 2924 } 2925 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 2926 for (i = 0; i < nent; i++) 2927 acb_list[i] = PTRIN(acb_list32[i]); 2928 free(acb_list32, M_LIO); 2929 2930 error = kern_lio_listio(td, uap->mode, 2931 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp, 2932 &aiocb32_ops_osigevent); 2933 free(acb_list, M_LIO); 2934 return (error); 2935 } 2936 #endif 2937 2938 int 2939 freebsd32_lio_listio(struct thread *td, struct freebsd32_lio_listio_args *uap) 2940 { 2941 struct aiocb **acb_list; 2942 struct sigevent *sigp, sig; 2943 struct sigevent32 sig32; 2944 uint32_t *acb_list32; 2945 int error, i, nent; 2946 2947 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 2948 return (EINVAL); 2949 2950 nent = uap->nent; 2951 if (nent < 0 || nent > max_aio_queue_per_proc) 2952 return (EINVAL); 2953 2954 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2955 error = copyin(uap->sig, &sig32, sizeof(sig32)); 2956 if (error) 2957 return (error); 2958 error = convert_sigevent32(&sig32, &sig); 2959 if (error) 2960 return (error); 2961 sigp = &sig; 2962 } else 2963 sigp = NULL; 2964 2965 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK); 2966 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t)); 2967 if (error) { 2968 free(acb_list32, M_LIO); 2969 return (error); 2970 } 2971 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 2972 for (i = 0; i < nent; i++) 2973 acb_list[i] = PTRIN(acb_list32[i]); 2974 free(acb_list32, M_LIO); 2975 2976 error = kern_lio_listio(td, uap->mode, 2977 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp, 2978 &aiocb32_ops); 2979 free(acb_list, M_LIO); 2980 return (error); 2981 } 2982 2983 #endif
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