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/9.1/sys/kern/vfs_aio.c 234438 2012-04-18 19:15:59Z ambrisko $"); 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/capability.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/protosw.h> 49 #include <sys/sema.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/syscall.h> 53 #include <sys/sysent.h> 54 #include <sys/sysctl.h> 55 #include <sys/sx.h> 56 #include <sys/taskqueue.h> 57 #include <sys/vnode.h> 58 #include <sys/conf.h> 59 #include <sys/event.h> 60 #include <sys/mount.h> 61 62 #include <machine/atomic.h> 63 64 #include <vm/vm.h> 65 #include <vm/vm_extern.h> 66 #include <vm/pmap.h> 67 #include <vm/vm_map.h> 68 #include <vm/vm_object.h> 69 #include <vm/uma.h> 70 #include <sys/aio.h> 71 72 #include "opt_vfs_aio.h" 73 74 /* 75 * Counter for allocating reference ids to new jobs. Wrapped to 1 on 76 * overflow. (XXX will be removed soon.) 77 */ 78 static u_long jobrefid; 79 80 /* 81 * Counter for aio_fsync. 82 */ 83 static uint64_t jobseqno; 84 85 #define JOBST_NULL 0 86 #define JOBST_JOBQSOCK 1 87 #define JOBST_JOBQGLOBAL 2 88 #define JOBST_JOBRUNNING 3 89 #define JOBST_JOBFINISHED 4 90 #define JOBST_JOBQBUF 5 91 #define JOBST_JOBQSYNC 6 92 93 #ifndef MAX_AIO_PER_PROC 94 #define MAX_AIO_PER_PROC 32 95 #endif 96 97 #ifndef MAX_AIO_QUEUE_PER_PROC 98 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */ 99 #endif 100 101 #ifndef MAX_AIO_PROCS 102 #define MAX_AIO_PROCS 32 103 #endif 104 105 #ifndef MAX_AIO_QUEUE 106 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */ 107 #endif 108 109 #ifndef TARGET_AIO_PROCS 110 #define TARGET_AIO_PROCS 4 111 #endif 112 113 #ifndef MAX_BUF_AIO 114 #define MAX_BUF_AIO 16 115 #endif 116 117 #ifndef AIOD_TIMEOUT_DEFAULT 118 #define AIOD_TIMEOUT_DEFAULT (10 * hz) 119 #endif 120 121 #ifndef AIOD_LIFETIME_DEFAULT 122 #define AIOD_LIFETIME_DEFAULT (30 * hz) 123 #endif 124 125 FEATURE(aio, "Asynchronous I/O"); 126 127 static MALLOC_DEFINE(M_LIO, "lio", "listio aio control block list"); 128 129 static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management"); 130 131 static int max_aio_procs = MAX_AIO_PROCS; 132 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, 133 CTLFLAG_RW, &max_aio_procs, 0, 134 "Maximum number of kernel threads to use for handling async IO "); 135 136 static int num_aio_procs = 0; 137 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, 138 CTLFLAG_RD, &num_aio_procs, 0, 139 "Number of presently active kernel threads for async IO"); 140 141 /* 142 * The code will adjust the actual number of AIO processes towards this 143 * number when it gets a chance. 144 */ 145 static int target_aio_procs = TARGET_AIO_PROCS; 146 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 147 0, "Preferred number of ready kernel threads for async IO"); 148 149 static int max_queue_count = MAX_AIO_QUEUE; 150 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, 151 "Maximum number of aio requests to queue, globally"); 152 153 static int num_queue_count = 0; 154 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, 155 "Number of queued aio requests"); 156 157 static int num_buf_aio = 0; 158 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, 159 "Number of aio requests presently handled by the buf subsystem"); 160 161 /* Number of async I/O thread in the process of being started */ 162 /* XXX This should be local to aio_aqueue() */ 163 static int num_aio_resv_start = 0; 164 165 static int aiod_timeout; 166 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0, 167 "Timeout value for synchronous aio operations"); 168 169 static int aiod_lifetime; 170 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, 171 "Maximum lifetime for idle aiod"); 172 173 static int unloadable = 0; 174 SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0, 175 "Allow unload of aio (not recommended)"); 176 177 178 static int max_aio_per_proc = MAX_AIO_PER_PROC; 179 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 180 0, "Maximum active aio requests per process (stored in the process)"); 181 182 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; 183 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, 184 &max_aio_queue_per_proc, 0, 185 "Maximum queued aio requests per process (stored in the process)"); 186 187 static int max_buf_aio = MAX_BUF_AIO; 188 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, 189 "Maximum buf aio requests per process (stored in the process)"); 190 191 typedef struct oaiocb { 192 int aio_fildes; /* File descriptor */ 193 off_t aio_offset; /* File offset for I/O */ 194 volatile void *aio_buf; /* I/O buffer in process space */ 195 size_t aio_nbytes; /* Number of bytes for I/O */ 196 struct osigevent aio_sigevent; /* Signal to deliver */ 197 int aio_lio_opcode; /* LIO opcode */ 198 int aio_reqprio; /* Request priority -- ignored */ 199 struct __aiocb_private _aiocb_private; 200 } oaiocb_t; 201 202 /* 203 * Below is a key of locks used to protect each member of struct aiocblist 204 * aioliojob and kaioinfo and any backends. 205 * 206 * * - need not protected 207 * a - locked by kaioinfo lock 208 * b - locked by backend lock, the backend lock can be null in some cases, 209 * for example, BIO belongs to this type, in this case, proc lock is 210 * reused. 211 * c - locked by aio_job_mtx, the lock for the generic file I/O backend. 212 */ 213 214 /* 215 * Current, there is only two backends: BIO and generic file I/O. 216 * socket I/O is served by generic file I/O, this is not a good idea, since 217 * disk file I/O and any other types without O_NONBLOCK flag can block daemon 218 * threads, if there is no thread to serve socket I/O, the socket I/O will be 219 * delayed too long or starved, we should create some threads dedicated to 220 * sockets to do non-blocking I/O, same for pipe and fifo, for these I/O 221 * systems we really need non-blocking interface, fiddling O_NONBLOCK in file 222 * structure is not safe because there is race between userland and aio 223 * daemons. 224 */ 225 226 struct aiocblist { 227 TAILQ_ENTRY(aiocblist) list; /* (b) internal list of for backend */ 228 TAILQ_ENTRY(aiocblist) plist; /* (a) list of jobs for each backend */ 229 TAILQ_ENTRY(aiocblist) allist; /* (a) list of all jobs in proc */ 230 int jobflags; /* (a) job flags */ 231 int jobstate; /* (b) job state */ 232 int inputcharge; /* (*) input blockes */ 233 int outputcharge; /* (*) output blockes */ 234 struct buf *bp; /* (*) private to BIO backend, 235 * buffer pointer 236 */ 237 struct proc *userproc; /* (*) user process */ 238 struct ucred *cred; /* (*) active credential when created */ 239 struct file *fd_file; /* (*) pointer to file structure */ 240 struct aioliojob *lio; /* (*) optional lio job */ 241 struct aiocb *uuaiocb; /* (*) pointer in userspace of aiocb */ 242 struct knlist klist; /* (a) list of knotes */ 243 struct aiocb uaiocb; /* (*) kernel I/O control block */ 244 ksiginfo_t ksi; /* (a) realtime signal info */ 245 struct task biotask; /* (*) private to BIO backend */ 246 uint64_t seqno; /* (*) job number */ 247 int pending; /* (a) number of pending I/O, aio_fsync only */ 248 }; 249 250 /* jobflags */ 251 #define AIOCBLIST_DONE 0x01 252 #define AIOCBLIST_BUFDONE 0x02 253 #define AIOCBLIST_RUNDOWN 0x04 254 #define AIOCBLIST_CHECKSYNC 0x08 255 256 /* 257 * AIO process info 258 */ 259 #define AIOP_FREE 0x1 /* proc on free queue */ 260 261 struct aiothreadlist { 262 int aiothreadflags; /* (c) AIO proc flags */ 263 TAILQ_ENTRY(aiothreadlist) list; /* (c) list of processes */ 264 struct thread *aiothread; /* (*) the AIO thread */ 265 }; 266 267 /* 268 * data-structure for lio signal management 269 */ 270 struct aioliojob { 271 int lioj_flags; /* (a) listio flags */ 272 int lioj_count; /* (a) listio flags */ 273 int lioj_finished_count; /* (a) listio flags */ 274 struct sigevent lioj_signal; /* (a) signal on all I/O done */ 275 TAILQ_ENTRY(aioliojob) lioj_list; /* (a) lio list */ 276 struct knlist klist; /* (a) list of knotes */ 277 ksiginfo_t lioj_ksi; /* (a) Realtime signal info */ 278 }; 279 280 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ 281 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ 282 #define LIOJ_KEVENT_POSTED 0x4 /* kevent triggered */ 283 284 /* 285 * per process aio data structure 286 */ 287 struct kaioinfo { 288 struct mtx kaio_mtx; /* the lock to protect this struct */ 289 int kaio_flags; /* (a) per process kaio flags */ 290 int kaio_maxactive_count; /* (*) maximum number of AIOs */ 291 int kaio_active_count; /* (c) number of currently used AIOs */ 292 int kaio_qallowed_count; /* (*) maxiumu size of AIO queue */ 293 int kaio_count; /* (a) size of AIO queue */ 294 int kaio_ballowed_count; /* (*) maximum number of buffers */ 295 int kaio_buffer_count; /* (a) number of physio buffers */ 296 TAILQ_HEAD(,aiocblist) kaio_all; /* (a) all AIOs in the process */ 297 TAILQ_HEAD(,aiocblist) kaio_done; /* (a) done queue for process */ 298 TAILQ_HEAD(,aioliojob) kaio_liojoblist; /* (a) list of lio jobs */ 299 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* (a) job queue for process */ 300 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* (a) buffer job queue for process */ 301 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* (a) queue for aios waiting on sockets, 302 * NOT USED YET. 303 */ 304 TAILQ_HEAD(,aiocblist) kaio_syncqueue; /* (a) queue for aio_fsync */ 305 struct task kaio_task; /* (*) task to kick aio threads */ 306 }; 307 308 #define AIO_LOCK(ki) mtx_lock(&(ki)->kaio_mtx) 309 #define AIO_UNLOCK(ki) mtx_unlock(&(ki)->kaio_mtx) 310 #define AIO_LOCK_ASSERT(ki, f) mtx_assert(&(ki)->kaio_mtx, (f)) 311 #define AIO_MTX(ki) (&(ki)->kaio_mtx) 312 313 #define KAIO_RUNDOWN 0x1 /* process is being run down */ 314 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */ 315 316 /* 317 * Operations used to interact with userland aio control blocks. 318 * Different ABIs provide their own operations. 319 */ 320 struct aiocb_ops { 321 int (*copyin)(struct aiocb *ujob, struct aiocb *kjob); 322 long (*fetch_status)(struct aiocb *ujob); 323 long (*fetch_error)(struct aiocb *ujob); 324 int (*store_status)(struct aiocb *ujob, long status); 325 int (*store_error)(struct aiocb *ujob, long error); 326 int (*store_kernelinfo)(struct aiocb *ujob, long jobref); 327 int (*store_aiocb)(struct aiocb **ujobp, struct aiocb *ujob); 328 }; 329 330 static TAILQ_HEAD(,aiothreadlist) aio_freeproc; /* (c) Idle daemons */ 331 static struct sema aio_newproc_sem; 332 static struct mtx aio_job_mtx; 333 static struct mtx aio_sock_mtx; 334 static TAILQ_HEAD(,aiocblist) aio_jobs; /* (c) Async job list */ 335 static struct unrhdr *aiod_unr; 336 337 void aio_init_aioinfo(struct proc *p); 338 static int aio_onceonly(void); 339 static int aio_free_entry(struct aiocblist *aiocbe); 340 static void aio_process(struct aiocblist *aiocbe); 341 static int aio_newproc(int *); 342 int aio_aqueue(struct thread *td, struct aiocb *job, 343 struct aioliojob *lio, int type, struct aiocb_ops *ops); 344 static void aio_physwakeup(struct buf *bp); 345 static void aio_proc_rundown(void *arg, struct proc *p); 346 static void aio_proc_rundown_exec(void *arg, struct proc *p, struct image_params *imgp); 347 static int aio_qphysio(struct proc *p, struct aiocblist *iocb); 348 static void biohelper(void *, int); 349 static void aio_daemon(void *param); 350 static void aio_swake_cb(struct socket *, struct sockbuf *); 351 static int aio_unload(void); 352 static void aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type); 353 #define DONE_BUF 1 354 #define DONE_QUEUE 2 355 static int aio_kick(struct proc *userp); 356 static void aio_kick_nowait(struct proc *userp); 357 static void aio_kick_helper(void *context, int pending); 358 static int filt_aioattach(struct knote *kn); 359 static void filt_aiodetach(struct knote *kn); 360 static int filt_aio(struct knote *kn, long hint); 361 static int filt_lioattach(struct knote *kn); 362 static void filt_liodetach(struct knote *kn); 363 static int filt_lio(struct knote *kn, long hint); 364 365 /* 366 * Zones for: 367 * kaio Per process async io info 368 * aiop async io thread data 369 * aiocb async io jobs 370 * aiol list io job pointer - internal to aio_suspend XXX 371 * aiolio list io jobs 372 */ 373 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone; 374 375 /* kqueue filters for aio */ 376 static struct filterops aio_filtops = { 377 .f_isfd = 0, 378 .f_attach = filt_aioattach, 379 .f_detach = filt_aiodetach, 380 .f_event = filt_aio, 381 }; 382 static struct filterops lio_filtops = { 383 .f_isfd = 0, 384 .f_attach = filt_lioattach, 385 .f_detach = filt_liodetach, 386 .f_event = filt_lio 387 }; 388 389 static eventhandler_tag exit_tag, exec_tag; 390 391 TASKQUEUE_DEFINE_THREAD(aiod_bio); 392 393 /* 394 * Main operations function for use as a kernel module. 395 */ 396 static int 397 aio_modload(struct module *module, int cmd, void *arg) 398 { 399 int error = 0; 400 401 switch (cmd) { 402 case MOD_LOAD: 403 aio_onceonly(); 404 break; 405 case MOD_UNLOAD: 406 error = aio_unload(); 407 break; 408 case MOD_SHUTDOWN: 409 break; 410 default: 411 error = EINVAL; 412 break; 413 } 414 return (error); 415 } 416 417 static moduledata_t aio_mod = { 418 "aio", 419 &aio_modload, 420 NULL 421 }; 422 423 static struct syscall_helper_data aio_syscalls[] = { 424 SYSCALL_INIT_HELPER(aio_cancel), 425 SYSCALL_INIT_HELPER(aio_error), 426 SYSCALL_INIT_HELPER(aio_fsync), 427 SYSCALL_INIT_HELPER(aio_read), 428 SYSCALL_INIT_HELPER(aio_return), 429 SYSCALL_INIT_HELPER(aio_suspend), 430 SYSCALL_INIT_HELPER(aio_waitcomplete), 431 SYSCALL_INIT_HELPER(aio_write), 432 SYSCALL_INIT_HELPER(lio_listio), 433 SYSCALL_INIT_HELPER(oaio_read), 434 SYSCALL_INIT_HELPER(oaio_write), 435 SYSCALL_INIT_HELPER(olio_listio), 436 SYSCALL_INIT_LAST 437 }; 438 439 #ifdef COMPAT_FREEBSD32 440 #include <sys/mount.h> 441 #include <sys/socket.h> 442 #include <compat/freebsd32/freebsd32.h> 443 #include <compat/freebsd32/freebsd32_proto.h> 444 #include <compat/freebsd32/freebsd32_signal.h> 445 #include <compat/freebsd32/freebsd32_syscall.h> 446 #include <compat/freebsd32/freebsd32_util.h> 447 448 static struct syscall_helper_data aio32_syscalls[] = { 449 SYSCALL32_INIT_HELPER(freebsd32_aio_return), 450 SYSCALL32_INIT_HELPER(freebsd32_aio_suspend), 451 SYSCALL32_INIT_HELPER(freebsd32_aio_cancel), 452 SYSCALL32_INIT_HELPER(freebsd32_aio_error), 453 SYSCALL32_INIT_HELPER(freebsd32_aio_fsync), 454 SYSCALL32_INIT_HELPER(freebsd32_aio_read), 455 SYSCALL32_INIT_HELPER(freebsd32_aio_write), 456 SYSCALL32_INIT_HELPER(freebsd32_aio_waitcomplete), 457 SYSCALL32_INIT_HELPER(freebsd32_lio_listio), 458 SYSCALL32_INIT_HELPER(freebsd32_oaio_read), 459 SYSCALL32_INIT_HELPER(freebsd32_oaio_write), 460 SYSCALL32_INIT_HELPER(freebsd32_olio_listio), 461 SYSCALL_INIT_LAST 462 }; 463 #endif 464 465 DECLARE_MODULE(aio, aio_mod, 466 SI_SUB_VFS, SI_ORDER_ANY); 467 MODULE_VERSION(aio, 1); 468 469 /* 470 * Startup initialization 471 */ 472 static int 473 aio_onceonly(void) 474 { 475 int error; 476 477 /* XXX: should probably just use so->callback */ 478 aio_swake = &aio_swake_cb; 479 exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL, 480 EVENTHANDLER_PRI_ANY); 481 exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown_exec, NULL, 482 EVENTHANDLER_PRI_ANY); 483 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops); 484 kqueue_add_filteropts(EVFILT_LIO, &lio_filtops); 485 TAILQ_INIT(&aio_freeproc); 486 sema_init(&aio_newproc_sem, 0, "aio_new_proc"); 487 mtx_init(&aio_job_mtx, "aio_job", NULL, MTX_DEF); 488 mtx_init(&aio_sock_mtx, "aio_sock", NULL, MTX_DEF); 489 TAILQ_INIT(&aio_jobs); 490 aiod_unr = new_unrhdr(1, INT_MAX, NULL); 491 kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL, 492 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 493 aiop_zone = uma_zcreate("AIOP", sizeof(struct aiothreadlist), NULL, 494 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 495 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct aiocblist), NULL, NULL, 496 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 497 aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL, 498 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 499 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL, 500 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 501 aiod_timeout = AIOD_TIMEOUT_DEFAULT; 502 aiod_lifetime = AIOD_LIFETIME_DEFAULT; 503 jobrefid = 1; 504 async_io_version = _POSIX_VERSION; 505 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX); 506 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE); 507 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0); 508 509 error = syscall_helper_register(aio_syscalls); 510 if (error) 511 return (error); 512 #ifdef COMPAT_FREEBSD32 513 error = syscall32_helper_register(aio32_syscalls); 514 if (error) 515 return (error); 516 #endif 517 return (0); 518 } 519 520 /* 521 * Callback for unload of AIO when used as a module. 522 */ 523 static int 524 aio_unload(void) 525 { 526 int error; 527 528 /* 529 * XXX: no unloads by default, it's too dangerous. 530 * perhaps we could do it if locked out callers and then 531 * did an aio_proc_rundown() on each process. 532 * 533 * jhb: aio_proc_rundown() needs to run on curproc though, 534 * so I don't think that would fly. 535 */ 536 if (!unloadable) 537 return (EOPNOTSUPP); 538 539 #ifdef COMPAT_FREEBSD32 540 syscall32_helper_unregister(aio32_syscalls); 541 #endif 542 syscall_helper_unregister(aio_syscalls); 543 544 error = kqueue_del_filteropts(EVFILT_AIO); 545 if (error) 546 return error; 547 error = kqueue_del_filteropts(EVFILT_LIO); 548 if (error) 549 return error; 550 async_io_version = 0; 551 aio_swake = NULL; 552 taskqueue_free(taskqueue_aiod_bio); 553 delete_unrhdr(aiod_unr); 554 uma_zdestroy(kaio_zone); 555 uma_zdestroy(aiop_zone); 556 uma_zdestroy(aiocb_zone); 557 uma_zdestroy(aiol_zone); 558 uma_zdestroy(aiolio_zone); 559 EVENTHANDLER_DEREGISTER(process_exit, exit_tag); 560 EVENTHANDLER_DEREGISTER(process_exec, exec_tag); 561 mtx_destroy(&aio_job_mtx); 562 mtx_destroy(&aio_sock_mtx); 563 sema_destroy(&aio_newproc_sem); 564 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, -1); 565 p31b_setcfg(CTL_P1003_1B_AIO_MAX, -1); 566 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, -1); 567 return (0); 568 } 569 570 /* 571 * Init the per-process aioinfo structure. The aioinfo limits are set 572 * per-process for user limit (resource) management. 573 */ 574 void 575 aio_init_aioinfo(struct proc *p) 576 { 577 struct kaioinfo *ki; 578 579 ki = uma_zalloc(kaio_zone, M_WAITOK); 580 mtx_init(&ki->kaio_mtx, "aiomtx", NULL, MTX_DEF); 581 ki->kaio_flags = 0; 582 ki->kaio_maxactive_count = max_aio_per_proc; 583 ki->kaio_active_count = 0; 584 ki->kaio_qallowed_count = max_aio_queue_per_proc; 585 ki->kaio_count = 0; 586 ki->kaio_ballowed_count = max_buf_aio; 587 ki->kaio_buffer_count = 0; 588 TAILQ_INIT(&ki->kaio_all); 589 TAILQ_INIT(&ki->kaio_done); 590 TAILQ_INIT(&ki->kaio_jobqueue); 591 TAILQ_INIT(&ki->kaio_bufqueue); 592 TAILQ_INIT(&ki->kaio_liojoblist); 593 TAILQ_INIT(&ki->kaio_sockqueue); 594 TAILQ_INIT(&ki->kaio_syncqueue); 595 TASK_INIT(&ki->kaio_task, 0, aio_kick_helper, p); 596 PROC_LOCK(p); 597 if (p->p_aioinfo == NULL) { 598 p->p_aioinfo = ki; 599 PROC_UNLOCK(p); 600 } else { 601 PROC_UNLOCK(p); 602 mtx_destroy(&ki->kaio_mtx); 603 uma_zfree(kaio_zone, ki); 604 } 605 606 while (num_aio_procs < MIN(target_aio_procs, max_aio_procs)) 607 aio_newproc(NULL); 608 } 609 610 static int 611 aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi) 612 { 613 struct thread *td; 614 int error; 615 616 error = sigev_findtd(p, sigev, &td); 617 if (error) 618 return (error); 619 if (!KSI_ONQ(ksi)) { 620 ksiginfo_set_sigev(ksi, sigev); 621 ksi->ksi_code = SI_ASYNCIO; 622 ksi->ksi_flags |= KSI_EXT | KSI_INS; 623 tdsendsignal(p, td, ksi->ksi_signo, ksi); 624 } 625 PROC_UNLOCK(p); 626 return (error); 627 } 628 629 /* 630 * Free a job entry. Wait for completion if it is currently active, but don't 631 * delay forever. If we delay, we return a flag that says that we have to 632 * restart the queue scan. 633 */ 634 static int 635 aio_free_entry(struct aiocblist *aiocbe) 636 { 637 struct kaioinfo *ki; 638 struct aioliojob *lj; 639 struct proc *p; 640 641 p = aiocbe->userproc; 642 MPASS(curproc == p); 643 ki = p->p_aioinfo; 644 MPASS(ki != NULL); 645 646 AIO_LOCK_ASSERT(ki, MA_OWNED); 647 MPASS(aiocbe->jobstate == JOBST_JOBFINISHED); 648 649 atomic_subtract_int(&num_queue_count, 1); 650 651 ki->kaio_count--; 652 MPASS(ki->kaio_count >= 0); 653 654 TAILQ_REMOVE(&ki->kaio_done, aiocbe, plist); 655 TAILQ_REMOVE(&ki->kaio_all, aiocbe, allist); 656 657 lj = aiocbe->lio; 658 if (lj) { 659 lj->lioj_count--; 660 lj->lioj_finished_count--; 661 662 if (lj->lioj_count == 0) { 663 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 664 /* lio is going away, we need to destroy any knotes */ 665 knlist_delete(&lj->klist, curthread, 1); 666 PROC_LOCK(p); 667 sigqueue_take(&lj->lioj_ksi); 668 PROC_UNLOCK(p); 669 uma_zfree(aiolio_zone, lj); 670 } 671 } 672 673 /* aiocbe is going away, we need to destroy any knotes */ 674 knlist_delete(&aiocbe->klist, curthread, 1); 675 PROC_LOCK(p); 676 sigqueue_take(&aiocbe->ksi); 677 PROC_UNLOCK(p); 678 679 MPASS(aiocbe->bp == NULL); 680 aiocbe->jobstate = JOBST_NULL; 681 AIO_UNLOCK(ki); 682 683 /* 684 * The thread argument here is used to find the owning process 685 * and is also passed to fo_close() which may pass it to various 686 * places such as devsw close() routines. Because of that, we 687 * need a thread pointer from the process owning the job that is 688 * persistent and won't disappear out from under us or move to 689 * another process. 690 * 691 * Currently, all the callers of this function call it to remove 692 * an aiocblist from the current process' job list either via a 693 * syscall or due to the current process calling exit() or 694 * execve(). Thus, we know that p == curproc. We also know that 695 * curthread can't exit since we are curthread. 696 * 697 * Therefore, we use curthread as the thread to pass to 698 * knlist_delete(). This does mean that it is possible for the 699 * thread pointer at close time to differ from the thread pointer 700 * at open time, but this is already true of file descriptors in 701 * a multithreaded process. 702 */ 703 fdrop(aiocbe->fd_file, curthread); 704 crfree(aiocbe->cred); 705 uma_zfree(aiocb_zone, aiocbe); 706 AIO_LOCK(ki); 707 708 return (0); 709 } 710 711 static void 712 aio_proc_rundown_exec(void *arg, struct proc *p, struct image_params *imgp __unused) 713 { 714 aio_proc_rundown(arg, p); 715 } 716 717 /* 718 * Rundown the jobs for a given process. 719 */ 720 static void 721 aio_proc_rundown(void *arg, struct proc *p) 722 { 723 struct kaioinfo *ki; 724 struct aioliojob *lj; 725 struct aiocblist *cbe, *cbn; 726 struct file *fp; 727 struct socket *so; 728 int remove; 729 730 KASSERT(curthread->td_proc == p, 731 ("%s: called on non-curproc", __func__)); 732 ki = p->p_aioinfo; 733 if (ki == NULL) 734 return; 735 736 AIO_LOCK(ki); 737 ki->kaio_flags |= KAIO_RUNDOWN; 738 739 restart: 740 741 /* 742 * Try to cancel all pending requests. This code simulates 743 * aio_cancel on all pending I/O requests. 744 */ 745 TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) { 746 remove = 0; 747 mtx_lock(&aio_job_mtx); 748 if (cbe->jobstate == JOBST_JOBQGLOBAL) { 749 TAILQ_REMOVE(&aio_jobs, cbe, list); 750 remove = 1; 751 } else if (cbe->jobstate == JOBST_JOBQSOCK) { 752 fp = cbe->fd_file; 753 MPASS(fp->f_type == DTYPE_SOCKET); 754 so = fp->f_data; 755 TAILQ_REMOVE(&so->so_aiojobq, cbe, list); 756 remove = 1; 757 } else if (cbe->jobstate == JOBST_JOBQSYNC) { 758 TAILQ_REMOVE(&ki->kaio_syncqueue, cbe, list); 759 remove = 1; 760 } 761 mtx_unlock(&aio_job_mtx); 762 763 if (remove) { 764 cbe->jobstate = JOBST_JOBFINISHED; 765 cbe->uaiocb._aiocb_private.status = -1; 766 cbe->uaiocb._aiocb_private.error = ECANCELED; 767 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); 768 aio_bio_done_notify(p, cbe, DONE_QUEUE); 769 } 770 } 771 772 /* Wait for all running I/O to be finished */ 773 if (TAILQ_FIRST(&ki->kaio_bufqueue) || 774 TAILQ_FIRST(&ki->kaio_jobqueue)) { 775 ki->kaio_flags |= KAIO_WAKEUP; 776 msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO, "aioprn", hz); 777 goto restart; 778 } 779 780 /* Free all completed I/O requests. */ 781 while ((cbe = TAILQ_FIRST(&ki->kaio_done)) != NULL) 782 aio_free_entry(cbe); 783 784 while ((lj = TAILQ_FIRST(&ki->kaio_liojoblist)) != NULL) { 785 if (lj->lioj_count == 0) { 786 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 787 knlist_delete(&lj->klist, curthread, 1); 788 PROC_LOCK(p); 789 sigqueue_take(&lj->lioj_ksi); 790 PROC_UNLOCK(p); 791 uma_zfree(aiolio_zone, lj); 792 } else { 793 panic("LIO job not cleaned up: C:%d, FC:%d\n", 794 lj->lioj_count, lj->lioj_finished_count); 795 } 796 } 797 AIO_UNLOCK(ki); 798 taskqueue_drain(taskqueue_aiod_bio, &ki->kaio_task); 799 mtx_destroy(&ki->kaio_mtx); 800 uma_zfree(kaio_zone, ki); 801 p->p_aioinfo = NULL; 802 } 803 804 /* 805 * Select a job to run (called by an AIO daemon). 806 */ 807 static struct aiocblist * 808 aio_selectjob(struct aiothreadlist *aiop) 809 { 810 struct aiocblist *aiocbe; 811 struct kaioinfo *ki; 812 struct proc *userp; 813 814 mtx_assert(&aio_job_mtx, MA_OWNED); 815 TAILQ_FOREACH(aiocbe, &aio_jobs, list) { 816 userp = aiocbe->userproc; 817 ki = userp->p_aioinfo; 818 819 if (ki->kaio_active_count < ki->kaio_maxactive_count) { 820 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 821 /* Account for currently active jobs. */ 822 ki->kaio_active_count++; 823 aiocbe->jobstate = JOBST_JOBRUNNING; 824 break; 825 } 826 } 827 return (aiocbe); 828 } 829 830 /* 831 * Move all data to a permanent storage device, this code 832 * simulates fsync syscall. 833 */ 834 static int 835 aio_fsync_vnode(struct thread *td, struct vnode *vp) 836 { 837 struct mount *mp; 838 int vfslocked; 839 int error; 840 841 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 842 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 843 goto drop; 844 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 845 if (vp->v_object != NULL) { 846 VM_OBJECT_LOCK(vp->v_object); 847 vm_object_page_clean(vp->v_object, 0, 0, 0); 848 VM_OBJECT_UNLOCK(vp->v_object); 849 } 850 error = VOP_FSYNC(vp, MNT_WAIT, td); 851 852 VOP_UNLOCK(vp, 0); 853 vn_finished_write(mp); 854 drop: 855 VFS_UNLOCK_GIANT(vfslocked); 856 return (error); 857 } 858 859 /* 860 * The AIO processing activity. This is the code that does the I/O request for 861 * the non-physio version of the operations. The normal vn operations are used, 862 * and this code should work in all instances for every type of file, including 863 * pipes, sockets, fifos, and regular files. 864 * 865 * XXX I don't think it works well for socket, pipe, and fifo. 866 */ 867 static void 868 aio_process(struct aiocblist *aiocbe) 869 { 870 struct ucred *td_savedcred; 871 struct thread *td; 872 struct aiocb *cb; 873 struct file *fp; 874 struct socket *so; 875 struct uio auio; 876 struct iovec aiov; 877 int cnt; 878 int error; 879 int oublock_st, oublock_end; 880 int inblock_st, inblock_end; 881 882 td = curthread; 883 td_savedcred = td->td_ucred; 884 td->td_ucred = aiocbe->cred; 885 cb = &aiocbe->uaiocb; 886 fp = aiocbe->fd_file; 887 888 if (cb->aio_lio_opcode == LIO_SYNC) { 889 error = 0; 890 cnt = 0; 891 if (fp->f_vnode != NULL) 892 error = aio_fsync_vnode(td, fp->f_vnode); 893 cb->_aiocb_private.error = error; 894 cb->_aiocb_private.status = 0; 895 td->td_ucred = td_savedcred; 896 return; 897 } 898 899 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf; 900 aiov.iov_len = cb->aio_nbytes; 901 902 auio.uio_iov = &aiov; 903 auio.uio_iovcnt = 1; 904 auio.uio_offset = cb->aio_offset; 905 auio.uio_resid = cb->aio_nbytes; 906 cnt = cb->aio_nbytes; 907 auio.uio_segflg = UIO_USERSPACE; 908 auio.uio_td = td; 909 910 inblock_st = td->td_ru.ru_inblock; 911 oublock_st = td->td_ru.ru_oublock; 912 /* 913 * aio_aqueue() acquires a reference to the file that is 914 * released in aio_free_entry(). 915 */ 916 if (cb->aio_lio_opcode == LIO_READ) { 917 auio.uio_rw = UIO_READ; 918 if (auio.uio_resid == 0) 919 error = 0; 920 else 921 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td); 922 } else { 923 if (fp->f_type == DTYPE_VNODE) 924 bwillwrite(); 925 auio.uio_rw = UIO_WRITE; 926 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td); 927 } 928 inblock_end = td->td_ru.ru_inblock; 929 oublock_end = td->td_ru.ru_oublock; 930 931 aiocbe->inputcharge = inblock_end - inblock_st; 932 aiocbe->outputcharge = oublock_end - oublock_st; 933 934 if ((error) && (auio.uio_resid != cnt)) { 935 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) 936 error = 0; 937 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) { 938 int sigpipe = 1; 939 if (fp->f_type == DTYPE_SOCKET) { 940 so = fp->f_data; 941 if (so->so_options & SO_NOSIGPIPE) 942 sigpipe = 0; 943 } 944 if (sigpipe) { 945 PROC_LOCK(aiocbe->userproc); 946 kern_psignal(aiocbe->userproc, SIGPIPE); 947 PROC_UNLOCK(aiocbe->userproc); 948 } 949 } 950 } 951 952 cnt -= auio.uio_resid; 953 cb->_aiocb_private.error = error; 954 cb->_aiocb_private.status = cnt; 955 td->td_ucred = td_savedcred; 956 } 957 958 static void 959 aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type) 960 { 961 struct aioliojob *lj; 962 struct kaioinfo *ki; 963 struct aiocblist *scb, *scbn; 964 int lj_done; 965 966 ki = userp->p_aioinfo; 967 AIO_LOCK_ASSERT(ki, MA_OWNED); 968 lj = aiocbe->lio; 969 lj_done = 0; 970 if (lj) { 971 lj->lioj_finished_count++; 972 if (lj->lioj_count == lj->lioj_finished_count) 973 lj_done = 1; 974 } 975 if (type == DONE_QUEUE) { 976 aiocbe->jobflags |= AIOCBLIST_DONE; 977 } else { 978 aiocbe->jobflags |= AIOCBLIST_BUFDONE; 979 } 980 TAILQ_INSERT_TAIL(&ki->kaio_done, aiocbe, plist); 981 aiocbe->jobstate = JOBST_JOBFINISHED; 982 983 if (ki->kaio_flags & KAIO_RUNDOWN) 984 goto notification_done; 985 986 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL || 987 aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) 988 aio_sendsig(userp, &aiocbe->uaiocb.aio_sigevent, &aiocbe->ksi); 989 990 KNOTE_LOCKED(&aiocbe->klist, 1); 991 992 if (lj_done) { 993 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { 994 lj->lioj_flags |= LIOJ_KEVENT_POSTED; 995 KNOTE_LOCKED(&lj->klist, 1); 996 } 997 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) 998 == LIOJ_SIGNAL 999 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || 1000 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) { 1001 aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi); 1002 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 1003 } 1004 } 1005 1006 notification_done: 1007 if (aiocbe->jobflags & AIOCBLIST_CHECKSYNC) { 1008 TAILQ_FOREACH_SAFE(scb, &ki->kaio_syncqueue, list, scbn) { 1009 if (aiocbe->fd_file == scb->fd_file && 1010 aiocbe->seqno < scb->seqno) { 1011 if (--scb->pending == 0) { 1012 mtx_lock(&aio_job_mtx); 1013 scb->jobstate = JOBST_JOBQGLOBAL; 1014 TAILQ_REMOVE(&ki->kaio_syncqueue, scb, list); 1015 TAILQ_INSERT_TAIL(&aio_jobs, scb, list); 1016 aio_kick_nowait(userp); 1017 mtx_unlock(&aio_job_mtx); 1018 } 1019 } 1020 } 1021 } 1022 if (ki->kaio_flags & KAIO_WAKEUP) { 1023 ki->kaio_flags &= ~KAIO_WAKEUP; 1024 wakeup(&userp->p_aioinfo); 1025 } 1026 } 1027 1028 /* 1029 * The AIO daemon, most of the actual work is done in aio_process, 1030 * but the setup (and address space mgmt) is done in this routine. 1031 */ 1032 static void 1033 aio_daemon(void *_id) 1034 { 1035 struct aiocblist *aiocbe; 1036 struct aiothreadlist *aiop; 1037 struct kaioinfo *ki; 1038 struct proc *curcp, *mycp, *userp; 1039 struct vmspace *myvm, *tmpvm; 1040 struct thread *td = curthread; 1041 int id = (intptr_t)_id; 1042 1043 /* 1044 * Local copies of curproc (cp) and vmspace (myvm) 1045 */ 1046 mycp = td->td_proc; 1047 myvm = mycp->p_vmspace; 1048 1049 KASSERT(mycp->p_textvp == NULL, ("kthread has a textvp")); 1050 1051 /* 1052 * Allocate and ready the aio control info. There is one aiop structure 1053 * per daemon. 1054 */ 1055 aiop = uma_zalloc(aiop_zone, M_WAITOK); 1056 aiop->aiothread = td; 1057 aiop->aiothreadflags = 0; 1058 1059 /* The daemon resides in its own pgrp. */ 1060 sys_setsid(td, NULL); 1061 1062 /* 1063 * Wakeup parent process. (Parent sleeps to keep from blasting away 1064 * and creating too many daemons.) 1065 */ 1066 sema_post(&aio_newproc_sem); 1067 1068 mtx_lock(&aio_job_mtx); 1069 for (;;) { 1070 /* 1071 * curcp is the current daemon process context. 1072 * userp is the current user process context. 1073 */ 1074 curcp = mycp; 1075 1076 /* 1077 * Take daemon off of free queue 1078 */ 1079 if (aiop->aiothreadflags & AIOP_FREE) { 1080 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1081 aiop->aiothreadflags &= ~AIOP_FREE; 1082 } 1083 1084 /* 1085 * Check for jobs. 1086 */ 1087 while ((aiocbe = aio_selectjob(aiop)) != NULL) { 1088 mtx_unlock(&aio_job_mtx); 1089 userp = aiocbe->userproc; 1090 1091 /* 1092 * Connect to process address space for user program. 1093 */ 1094 if (userp != curcp) { 1095 /* 1096 * Save the current address space that we are 1097 * connected to. 1098 */ 1099 tmpvm = mycp->p_vmspace; 1100 1101 /* 1102 * Point to the new user address space, and 1103 * refer to it. 1104 */ 1105 mycp->p_vmspace = userp->p_vmspace; 1106 atomic_add_int(&mycp->p_vmspace->vm_refcnt, 1); 1107 1108 /* Activate the new mapping. */ 1109 pmap_activate(FIRST_THREAD_IN_PROC(mycp)); 1110 1111 /* 1112 * If the old address space wasn't the daemons 1113 * own address space, then we need to remove the 1114 * daemon's reference from the other process 1115 * that it was acting on behalf of. 1116 */ 1117 if (tmpvm != myvm) { 1118 vmspace_free(tmpvm); 1119 } 1120 curcp = userp; 1121 } 1122 1123 ki = userp->p_aioinfo; 1124 1125 /* Do the I/O function. */ 1126 aio_process(aiocbe); 1127 1128 mtx_lock(&aio_job_mtx); 1129 /* Decrement the active job count. */ 1130 ki->kaio_active_count--; 1131 mtx_unlock(&aio_job_mtx); 1132 1133 AIO_LOCK(ki); 1134 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 1135 aio_bio_done_notify(userp, aiocbe, DONE_QUEUE); 1136 AIO_UNLOCK(ki); 1137 1138 mtx_lock(&aio_job_mtx); 1139 } 1140 1141 /* 1142 * Disconnect from user address space. 1143 */ 1144 if (curcp != mycp) { 1145 1146 mtx_unlock(&aio_job_mtx); 1147 1148 /* Get the user address space to disconnect from. */ 1149 tmpvm = mycp->p_vmspace; 1150 1151 /* Get original address space for daemon. */ 1152 mycp->p_vmspace = myvm; 1153 1154 /* Activate the daemon's address space. */ 1155 pmap_activate(FIRST_THREAD_IN_PROC(mycp)); 1156 #ifdef DIAGNOSTIC 1157 if (tmpvm == myvm) { 1158 printf("AIOD: vmspace problem -- %d\n", 1159 mycp->p_pid); 1160 } 1161 #endif 1162 /* Remove our vmspace reference. */ 1163 vmspace_free(tmpvm); 1164 1165 curcp = mycp; 1166 1167 mtx_lock(&aio_job_mtx); 1168 /* 1169 * We have to restart to avoid race, we only sleep if 1170 * no job can be selected, that should be 1171 * curcp == mycp. 1172 */ 1173 continue; 1174 } 1175 1176 mtx_assert(&aio_job_mtx, MA_OWNED); 1177 1178 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 1179 aiop->aiothreadflags |= AIOP_FREE; 1180 1181 /* 1182 * If daemon is inactive for a long time, allow it to exit, 1183 * thereby freeing resources. 1184 */ 1185 if (msleep(aiop->aiothread, &aio_job_mtx, PRIBIO, "aiordy", 1186 aiod_lifetime)) { 1187 if (TAILQ_EMPTY(&aio_jobs)) { 1188 if ((aiop->aiothreadflags & AIOP_FREE) && 1189 (num_aio_procs > target_aio_procs)) { 1190 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1191 num_aio_procs--; 1192 mtx_unlock(&aio_job_mtx); 1193 uma_zfree(aiop_zone, aiop); 1194 free_unr(aiod_unr, id); 1195 #ifdef DIAGNOSTIC 1196 if (mycp->p_vmspace->vm_refcnt <= 1) { 1197 printf("AIOD: bad vm refcnt for" 1198 " exiting daemon: %d\n", 1199 mycp->p_vmspace->vm_refcnt); 1200 } 1201 #endif 1202 kproc_exit(0); 1203 } 1204 } 1205 } 1206 } 1207 mtx_unlock(&aio_job_mtx); 1208 panic("shouldn't be here\n"); 1209 } 1210 1211 /* 1212 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The 1213 * AIO daemon modifies its environment itself. 1214 */ 1215 static int 1216 aio_newproc(int *start) 1217 { 1218 int error; 1219 struct proc *p; 1220 int id; 1221 1222 id = alloc_unr(aiod_unr); 1223 error = kproc_create(aio_daemon, (void *)(intptr_t)id, &p, 1224 RFNOWAIT, 0, "aiod%d", id); 1225 if (error == 0) { 1226 /* 1227 * Wait until daemon is started. 1228 */ 1229 sema_wait(&aio_newproc_sem); 1230 mtx_lock(&aio_job_mtx); 1231 num_aio_procs++; 1232 if (start != NULL) 1233 (*start)--; 1234 mtx_unlock(&aio_job_mtx); 1235 } else { 1236 free_unr(aiod_unr, id); 1237 } 1238 return (error); 1239 } 1240 1241 /* 1242 * Try the high-performance, low-overhead physio method for eligible 1243 * VCHR devices. This method doesn't use an aio helper thread, and 1244 * thus has very low overhead. 1245 * 1246 * Assumes that the caller, aio_aqueue(), has incremented the file 1247 * structure's reference count, preventing its deallocation for the 1248 * duration of this call. 1249 */ 1250 static int 1251 aio_qphysio(struct proc *p, struct aiocblist *aiocbe) 1252 { 1253 struct aiocb *cb; 1254 struct file *fp; 1255 struct buf *bp; 1256 struct vnode *vp; 1257 struct kaioinfo *ki; 1258 struct aioliojob *lj; 1259 int error; 1260 1261 cb = &aiocbe->uaiocb; 1262 fp = aiocbe->fd_file; 1263 1264 if (fp->f_type != DTYPE_VNODE) 1265 return (-1); 1266 1267 vp = fp->f_vnode; 1268 1269 /* 1270 * If its not a disk, we don't want to return a positive error. 1271 * It causes the aio code to not fall through to try the thread 1272 * way when you're talking to a regular file. 1273 */ 1274 if (!vn_isdisk(vp, &error)) { 1275 if (error == ENOTBLK) 1276 return (-1); 1277 else 1278 return (error); 1279 } 1280 1281 if (vp->v_bufobj.bo_bsize == 0) 1282 return (-1); 1283 1284 if (cb->aio_nbytes % vp->v_bufobj.bo_bsize) 1285 return (-1); 1286 1287 if (cb->aio_nbytes > vp->v_rdev->si_iosize_max) 1288 return (-1); 1289 1290 if (cb->aio_nbytes > 1291 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK)) 1292 return (-1); 1293 1294 ki = p->p_aioinfo; 1295 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count) 1296 return (-1); 1297 1298 /* Create and build a buffer header for a transfer. */ 1299 bp = (struct buf *)getpbuf(NULL); 1300 BUF_KERNPROC(bp); 1301 1302 AIO_LOCK(ki); 1303 ki->kaio_count++; 1304 ki->kaio_buffer_count++; 1305 lj = aiocbe->lio; 1306 if (lj) 1307 lj->lioj_count++; 1308 AIO_UNLOCK(ki); 1309 1310 /* 1311 * Get a copy of the kva from the physical buffer. 1312 */ 1313 error = 0; 1314 1315 bp->b_bcount = cb->aio_nbytes; 1316 bp->b_bufsize = cb->aio_nbytes; 1317 bp->b_iodone = aio_physwakeup; 1318 bp->b_saveaddr = bp->b_data; 1319 bp->b_data = (void *)(uintptr_t)cb->aio_buf; 1320 bp->b_offset = cb->aio_offset; 1321 bp->b_iooffset = cb->aio_offset; 1322 bp->b_blkno = btodb(cb->aio_offset); 1323 bp->b_iocmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ; 1324 1325 /* 1326 * Bring buffer into kernel space. 1327 */ 1328 if (vmapbuf(bp) < 0) { 1329 error = EFAULT; 1330 goto doerror; 1331 } 1332 1333 AIO_LOCK(ki); 1334 aiocbe->bp = bp; 1335 bp->b_caller1 = (void *)aiocbe; 1336 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist); 1337 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist); 1338 aiocbe->jobstate = JOBST_JOBQBUF; 1339 cb->_aiocb_private.status = cb->aio_nbytes; 1340 AIO_UNLOCK(ki); 1341 1342 atomic_add_int(&num_queue_count, 1); 1343 atomic_add_int(&num_buf_aio, 1); 1344 1345 bp->b_error = 0; 1346 1347 TASK_INIT(&aiocbe->biotask, 0, biohelper, aiocbe); 1348 1349 /* Perform transfer. */ 1350 dev_strategy(vp->v_rdev, bp); 1351 return (0); 1352 1353 doerror: 1354 AIO_LOCK(ki); 1355 ki->kaio_count--; 1356 ki->kaio_buffer_count--; 1357 if (lj) 1358 lj->lioj_count--; 1359 aiocbe->bp = NULL; 1360 AIO_UNLOCK(ki); 1361 relpbuf(bp, NULL); 1362 return (error); 1363 } 1364 1365 /* 1366 * Wake up aio requests that may be serviceable now. 1367 */ 1368 static void 1369 aio_swake_cb(struct socket *so, struct sockbuf *sb) 1370 { 1371 struct aiocblist *cb, *cbn; 1372 int opcode; 1373 1374 SOCKBUF_LOCK_ASSERT(sb); 1375 if (sb == &so->so_snd) 1376 opcode = LIO_WRITE; 1377 else 1378 opcode = LIO_READ; 1379 1380 sb->sb_flags &= ~SB_AIO; 1381 mtx_lock(&aio_job_mtx); 1382 TAILQ_FOREACH_SAFE(cb, &so->so_aiojobq, list, cbn) { 1383 if (opcode == cb->uaiocb.aio_lio_opcode) { 1384 if (cb->jobstate != JOBST_JOBQSOCK) 1385 panic("invalid queue value"); 1386 /* XXX 1387 * We don't have actual sockets backend yet, 1388 * so we simply move the requests to the generic 1389 * file I/O backend. 1390 */ 1391 TAILQ_REMOVE(&so->so_aiojobq, cb, list); 1392 TAILQ_INSERT_TAIL(&aio_jobs, cb, list); 1393 aio_kick_nowait(cb->userproc); 1394 } 1395 } 1396 mtx_unlock(&aio_job_mtx); 1397 } 1398 1399 static int 1400 convert_old_sigevent(struct osigevent *osig, struct sigevent *nsig) 1401 { 1402 1403 /* 1404 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are 1405 * supported by AIO with the old sigevent structure. 1406 */ 1407 nsig->sigev_notify = osig->sigev_notify; 1408 switch (nsig->sigev_notify) { 1409 case SIGEV_NONE: 1410 break; 1411 case SIGEV_SIGNAL: 1412 nsig->sigev_signo = osig->__sigev_u.__sigev_signo; 1413 break; 1414 case SIGEV_KEVENT: 1415 nsig->sigev_notify_kqueue = 1416 osig->__sigev_u.__sigev_notify_kqueue; 1417 nsig->sigev_value.sival_ptr = osig->sigev_value.sival_ptr; 1418 break; 1419 default: 1420 return (EINVAL); 1421 } 1422 return (0); 1423 } 1424 1425 static int 1426 aiocb_copyin_old_sigevent(struct aiocb *ujob, struct aiocb *kjob) 1427 { 1428 struct oaiocb *ojob; 1429 int error; 1430 1431 bzero(kjob, sizeof(struct aiocb)); 1432 error = copyin(ujob, kjob, sizeof(struct oaiocb)); 1433 if (error) 1434 return (error); 1435 ojob = (struct oaiocb *)kjob; 1436 return (convert_old_sigevent(&ojob->aio_sigevent, &kjob->aio_sigevent)); 1437 } 1438 1439 static int 1440 aiocb_copyin(struct aiocb *ujob, struct aiocb *kjob) 1441 { 1442 1443 return (copyin(ujob, kjob, sizeof(struct aiocb))); 1444 } 1445 1446 static long 1447 aiocb_fetch_status(struct aiocb *ujob) 1448 { 1449 1450 return (fuword(&ujob->_aiocb_private.status)); 1451 } 1452 1453 static long 1454 aiocb_fetch_error(struct aiocb *ujob) 1455 { 1456 1457 return (fuword(&ujob->_aiocb_private.error)); 1458 } 1459 1460 static int 1461 aiocb_store_status(struct aiocb *ujob, long status) 1462 { 1463 1464 return (suword(&ujob->_aiocb_private.status, status)); 1465 } 1466 1467 static int 1468 aiocb_store_error(struct aiocb *ujob, long error) 1469 { 1470 1471 return (suword(&ujob->_aiocb_private.error, error)); 1472 } 1473 1474 static int 1475 aiocb_store_kernelinfo(struct aiocb *ujob, long jobref) 1476 { 1477 1478 return (suword(&ujob->_aiocb_private.kernelinfo, jobref)); 1479 } 1480 1481 static int 1482 aiocb_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob) 1483 { 1484 1485 return (suword(ujobp, (long)ujob)); 1486 } 1487 1488 static struct aiocb_ops aiocb_ops = { 1489 .copyin = aiocb_copyin, 1490 .fetch_status = aiocb_fetch_status, 1491 .fetch_error = aiocb_fetch_error, 1492 .store_status = aiocb_store_status, 1493 .store_error = aiocb_store_error, 1494 .store_kernelinfo = aiocb_store_kernelinfo, 1495 .store_aiocb = aiocb_store_aiocb, 1496 }; 1497 1498 static struct aiocb_ops aiocb_ops_osigevent = { 1499 .copyin = aiocb_copyin_old_sigevent, 1500 .fetch_status = aiocb_fetch_status, 1501 .fetch_error = aiocb_fetch_error, 1502 .store_status = aiocb_store_status, 1503 .store_error = aiocb_store_error, 1504 .store_kernelinfo = aiocb_store_kernelinfo, 1505 .store_aiocb = aiocb_store_aiocb, 1506 }; 1507 1508 /* 1509 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR 1510 * technique is done in this code. 1511 */ 1512 int 1513 aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj, 1514 int type, struct aiocb_ops *ops) 1515 { 1516 struct proc *p = td->td_proc; 1517 struct file *fp; 1518 struct socket *so; 1519 struct aiocblist *aiocbe, *cb; 1520 struct kaioinfo *ki; 1521 struct kevent kev; 1522 struct sockbuf *sb; 1523 int opcode; 1524 int error; 1525 int fd, kqfd; 1526 int jid; 1527 u_short evflags; 1528 1529 if (p->p_aioinfo == NULL) 1530 aio_init_aioinfo(p); 1531 1532 ki = p->p_aioinfo; 1533 1534 ops->store_status(job, -1); 1535 ops->store_error(job, 0); 1536 ops->store_kernelinfo(job, -1); 1537 1538 if (num_queue_count >= max_queue_count || 1539 ki->kaio_count >= ki->kaio_qallowed_count) { 1540 ops->store_error(job, EAGAIN); 1541 return (EAGAIN); 1542 } 1543 1544 aiocbe = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO); 1545 aiocbe->inputcharge = 0; 1546 aiocbe->outputcharge = 0; 1547 knlist_init_mtx(&aiocbe->klist, AIO_MTX(ki)); 1548 1549 error = ops->copyin(job, &aiocbe->uaiocb); 1550 if (error) { 1551 ops->store_error(job, error); 1552 uma_zfree(aiocb_zone, aiocbe); 1553 return (error); 1554 } 1555 1556 if (aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT && 1557 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL && 1558 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID && 1559 aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) { 1560 ops->store_error(job, EINVAL); 1561 uma_zfree(aiocb_zone, aiocbe); 1562 return (EINVAL); 1563 } 1564 1565 if ((aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL || 1566 aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) && 1567 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) { 1568 uma_zfree(aiocb_zone, aiocbe); 1569 return (EINVAL); 1570 } 1571 1572 ksiginfo_init(&aiocbe->ksi); 1573 1574 /* Save userspace address of the job info. */ 1575 aiocbe->uuaiocb = job; 1576 1577 /* Get the opcode. */ 1578 if (type != LIO_NOP) 1579 aiocbe->uaiocb.aio_lio_opcode = type; 1580 opcode = aiocbe->uaiocb.aio_lio_opcode; 1581 1582 /* 1583 * Validate the opcode and fetch the file object for the specified 1584 * file descriptor. 1585 * 1586 * XXXRW: Moved the opcode validation up here so that we don't 1587 * retrieve a file descriptor without knowing what the capabiltity 1588 * should be. 1589 */ 1590 fd = aiocbe->uaiocb.aio_fildes; 1591 switch (opcode) { 1592 case LIO_WRITE: 1593 error = fget_write(td, fd, CAP_WRITE | CAP_SEEK, &fp); 1594 break; 1595 case LIO_READ: 1596 error = fget_read(td, fd, CAP_READ | CAP_SEEK, &fp); 1597 break; 1598 case LIO_SYNC: 1599 error = fget(td, fd, CAP_FSYNC, &fp); 1600 break; 1601 case LIO_NOP: 1602 error = fget(td, fd, 0, &fp); 1603 break; 1604 default: 1605 error = EINVAL; 1606 } 1607 if (error) { 1608 uma_zfree(aiocb_zone, aiocbe); 1609 ops->store_error(job, error); 1610 return (error); 1611 } 1612 1613 if (opcode == LIO_SYNC && fp->f_vnode == NULL) { 1614 error = EINVAL; 1615 goto aqueue_fail; 1616 } 1617 1618 if (opcode != LIO_SYNC && aiocbe->uaiocb.aio_offset == -1LL) { 1619 error = EINVAL; 1620 goto aqueue_fail; 1621 } 1622 1623 aiocbe->fd_file = fp; 1624 1625 mtx_lock(&aio_job_mtx); 1626 jid = jobrefid++; 1627 aiocbe->seqno = jobseqno++; 1628 mtx_unlock(&aio_job_mtx); 1629 error = ops->store_kernelinfo(job, jid); 1630 if (error) { 1631 error = EINVAL; 1632 goto aqueue_fail; 1633 } 1634 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid; 1635 1636 if (opcode == LIO_NOP) { 1637 fdrop(fp, td); 1638 uma_zfree(aiocb_zone, aiocbe); 1639 return (0); 1640 } 1641 1642 if (aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT) 1643 goto no_kqueue; 1644 evflags = aiocbe->uaiocb.aio_sigevent.sigev_notify_kevent_flags; 1645 if ((evflags & ~(EV_CLEAR | EV_DISPATCH | EV_ONESHOT)) != 0) { 1646 error = EINVAL; 1647 goto aqueue_fail; 1648 } 1649 kqfd = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue; 1650 kev.ident = (uintptr_t)aiocbe->uuaiocb; 1651 kev.filter = EVFILT_AIO; 1652 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1 | evflags; 1653 kev.data = (intptr_t)aiocbe; 1654 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sival_ptr; 1655 error = kqfd_register(kqfd, &kev, td, 1); 1656 aqueue_fail: 1657 if (error) { 1658 fdrop(fp, td); 1659 uma_zfree(aiocb_zone, aiocbe); 1660 ops->store_error(job, error); 1661 goto done; 1662 } 1663 no_kqueue: 1664 1665 ops->store_error(job, EINPROGRESS); 1666 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS; 1667 aiocbe->userproc = p; 1668 aiocbe->cred = crhold(td->td_ucred); 1669 aiocbe->jobflags = 0; 1670 aiocbe->lio = lj; 1671 1672 if (opcode == LIO_SYNC) 1673 goto queueit; 1674 1675 if (fp->f_type == DTYPE_SOCKET) { 1676 /* 1677 * Alternate queueing for socket ops: Reach down into the 1678 * descriptor to get the socket data. Then check to see if the 1679 * socket is ready to be read or written (based on the requested 1680 * operation). 1681 * 1682 * If it is not ready for io, then queue the aiocbe on the 1683 * socket, and set the flags so we get a call when sbnotify() 1684 * happens. 1685 * 1686 * Note if opcode is neither LIO_WRITE nor LIO_READ we lock 1687 * and unlock the snd sockbuf for no reason. 1688 */ 1689 so = fp->f_data; 1690 sb = (opcode == LIO_READ) ? &so->so_rcv : &so->so_snd; 1691 SOCKBUF_LOCK(sb); 1692 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode == 1693 LIO_WRITE) && (!sowriteable(so)))) { 1694 sb->sb_flags |= SB_AIO; 1695 1696 mtx_lock(&aio_job_mtx); 1697 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list); 1698 mtx_unlock(&aio_job_mtx); 1699 1700 AIO_LOCK(ki); 1701 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist); 1702 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); 1703 aiocbe->jobstate = JOBST_JOBQSOCK; 1704 ki->kaio_count++; 1705 if (lj) 1706 lj->lioj_count++; 1707 AIO_UNLOCK(ki); 1708 SOCKBUF_UNLOCK(sb); 1709 atomic_add_int(&num_queue_count, 1); 1710 error = 0; 1711 goto done; 1712 } 1713 SOCKBUF_UNLOCK(sb); 1714 } 1715 1716 if ((error = aio_qphysio(p, aiocbe)) == 0) 1717 goto done; 1718 #if 0 1719 if (error > 0) { 1720 aiocbe->uaiocb._aiocb_private.error = error; 1721 ops->store_error(job, error); 1722 goto done; 1723 } 1724 #endif 1725 queueit: 1726 /* No buffer for daemon I/O. */ 1727 aiocbe->bp = NULL; 1728 atomic_add_int(&num_queue_count, 1); 1729 1730 AIO_LOCK(ki); 1731 ki->kaio_count++; 1732 if (lj) 1733 lj->lioj_count++; 1734 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); 1735 TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist); 1736 if (opcode == LIO_SYNC) { 1737 TAILQ_FOREACH(cb, &ki->kaio_jobqueue, plist) { 1738 if (cb->fd_file == aiocbe->fd_file && 1739 cb->uaiocb.aio_lio_opcode != LIO_SYNC && 1740 cb->seqno < aiocbe->seqno) { 1741 cb->jobflags |= AIOCBLIST_CHECKSYNC; 1742 aiocbe->pending++; 1743 } 1744 } 1745 TAILQ_FOREACH(cb, &ki->kaio_bufqueue, plist) { 1746 if (cb->fd_file == aiocbe->fd_file && 1747 cb->uaiocb.aio_lio_opcode != LIO_SYNC && 1748 cb->seqno < aiocbe->seqno) { 1749 cb->jobflags |= AIOCBLIST_CHECKSYNC; 1750 aiocbe->pending++; 1751 } 1752 } 1753 if (aiocbe->pending != 0) { 1754 TAILQ_INSERT_TAIL(&ki->kaio_syncqueue, aiocbe, list); 1755 aiocbe->jobstate = JOBST_JOBQSYNC; 1756 AIO_UNLOCK(ki); 1757 goto done; 1758 } 1759 } 1760 mtx_lock(&aio_job_mtx); 1761 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list); 1762 aiocbe->jobstate = JOBST_JOBQGLOBAL; 1763 aio_kick_nowait(p); 1764 mtx_unlock(&aio_job_mtx); 1765 AIO_UNLOCK(ki); 1766 error = 0; 1767 done: 1768 return (error); 1769 } 1770 1771 static void 1772 aio_kick_nowait(struct proc *userp) 1773 { 1774 struct kaioinfo *ki = userp->p_aioinfo; 1775 struct aiothreadlist *aiop; 1776 1777 mtx_assert(&aio_job_mtx, MA_OWNED); 1778 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1779 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1780 aiop->aiothreadflags &= ~AIOP_FREE; 1781 wakeup(aiop->aiothread); 1782 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) && 1783 ((ki->kaio_active_count + num_aio_resv_start) < 1784 ki->kaio_maxactive_count)) { 1785 taskqueue_enqueue(taskqueue_aiod_bio, &ki->kaio_task); 1786 } 1787 } 1788 1789 static int 1790 aio_kick(struct proc *userp) 1791 { 1792 struct kaioinfo *ki = userp->p_aioinfo; 1793 struct aiothreadlist *aiop; 1794 int error, ret = 0; 1795 1796 mtx_assert(&aio_job_mtx, MA_OWNED); 1797 retryproc: 1798 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1799 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1800 aiop->aiothreadflags &= ~AIOP_FREE; 1801 wakeup(aiop->aiothread); 1802 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) && 1803 ((ki->kaio_active_count + num_aio_resv_start) < 1804 ki->kaio_maxactive_count)) { 1805 num_aio_resv_start++; 1806 mtx_unlock(&aio_job_mtx); 1807 error = aio_newproc(&num_aio_resv_start); 1808 mtx_lock(&aio_job_mtx); 1809 if (error) { 1810 num_aio_resv_start--; 1811 goto retryproc; 1812 } 1813 } else { 1814 ret = -1; 1815 } 1816 return (ret); 1817 } 1818 1819 static void 1820 aio_kick_helper(void *context, int pending) 1821 { 1822 struct proc *userp = context; 1823 1824 mtx_lock(&aio_job_mtx); 1825 while (--pending >= 0) { 1826 if (aio_kick(userp)) 1827 break; 1828 } 1829 mtx_unlock(&aio_job_mtx); 1830 } 1831 1832 /* 1833 * Support the aio_return system call, as a side-effect, kernel resources are 1834 * released. 1835 */ 1836 static int 1837 kern_aio_return(struct thread *td, struct aiocb *uaiocb, struct aiocb_ops *ops) 1838 { 1839 struct proc *p = td->td_proc; 1840 struct aiocblist *cb; 1841 struct kaioinfo *ki; 1842 int status, error; 1843 1844 ki = p->p_aioinfo; 1845 if (ki == NULL) 1846 return (EINVAL); 1847 AIO_LOCK(ki); 1848 TAILQ_FOREACH(cb, &ki->kaio_done, plist) { 1849 if (cb->uuaiocb == uaiocb) 1850 break; 1851 } 1852 if (cb != NULL) { 1853 MPASS(cb->jobstate == JOBST_JOBFINISHED); 1854 status = cb->uaiocb._aiocb_private.status; 1855 error = cb->uaiocb._aiocb_private.error; 1856 td->td_retval[0] = status; 1857 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 1858 td->td_ru.ru_oublock += cb->outputcharge; 1859 cb->outputcharge = 0; 1860 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 1861 td->td_ru.ru_inblock += cb->inputcharge; 1862 cb->inputcharge = 0; 1863 } 1864 aio_free_entry(cb); 1865 AIO_UNLOCK(ki); 1866 ops->store_error(uaiocb, error); 1867 ops->store_status(uaiocb, status); 1868 } else { 1869 error = EINVAL; 1870 AIO_UNLOCK(ki); 1871 } 1872 return (error); 1873 } 1874 1875 int 1876 sys_aio_return(struct thread *td, struct aio_return_args *uap) 1877 { 1878 1879 return (kern_aio_return(td, uap->aiocbp, &aiocb_ops)); 1880 } 1881 1882 /* 1883 * Allow a process to wakeup when any of the I/O requests are completed. 1884 */ 1885 static int 1886 kern_aio_suspend(struct thread *td, int njoblist, struct aiocb **ujoblist, 1887 struct timespec *ts) 1888 { 1889 struct proc *p = td->td_proc; 1890 struct timeval atv; 1891 struct kaioinfo *ki; 1892 struct aiocblist *cb, *cbfirst; 1893 int error, i, timo; 1894 1895 timo = 0; 1896 if (ts) { 1897 if (ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000) 1898 return (EINVAL); 1899 1900 TIMESPEC_TO_TIMEVAL(&atv, ts); 1901 if (itimerfix(&atv)) 1902 return (EINVAL); 1903 timo = tvtohz(&atv); 1904 } 1905 1906 ki = p->p_aioinfo; 1907 if (ki == NULL) 1908 return (EAGAIN); 1909 1910 if (njoblist == 0) 1911 return (0); 1912 1913 AIO_LOCK(ki); 1914 for (;;) { 1915 cbfirst = NULL; 1916 error = 0; 1917 TAILQ_FOREACH(cb, &ki->kaio_all, allist) { 1918 for (i = 0; i < njoblist; i++) { 1919 if (cb->uuaiocb == ujoblist[i]) { 1920 if (cbfirst == NULL) 1921 cbfirst = cb; 1922 if (cb->jobstate == JOBST_JOBFINISHED) 1923 goto RETURN; 1924 } 1925 } 1926 } 1927 /* All tasks were finished. */ 1928 if (cbfirst == NULL) 1929 break; 1930 1931 ki->kaio_flags |= KAIO_WAKEUP; 1932 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH, 1933 "aiospn", timo); 1934 if (error == ERESTART) 1935 error = EINTR; 1936 if (error) 1937 break; 1938 } 1939 RETURN: 1940 AIO_UNLOCK(ki); 1941 return (error); 1942 } 1943 1944 int 1945 sys_aio_suspend(struct thread *td, struct aio_suspend_args *uap) 1946 { 1947 struct timespec ts, *tsp; 1948 struct aiocb **ujoblist; 1949 int error; 1950 1951 if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX) 1952 return (EINVAL); 1953 1954 if (uap->timeout) { 1955 /* Get timespec struct. */ 1956 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) 1957 return (error); 1958 tsp = &ts; 1959 } else 1960 tsp = NULL; 1961 1962 ujoblist = uma_zalloc(aiol_zone, M_WAITOK); 1963 error = copyin(uap->aiocbp, ujoblist, uap->nent * sizeof(ujoblist[0])); 1964 if (error == 0) 1965 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp); 1966 uma_zfree(aiol_zone, ujoblist); 1967 return (error); 1968 } 1969 1970 /* 1971 * aio_cancel cancels any non-physio aio operations not currently in 1972 * progress. 1973 */ 1974 int 1975 sys_aio_cancel(struct thread *td, struct aio_cancel_args *uap) 1976 { 1977 struct proc *p = td->td_proc; 1978 struct kaioinfo *ki; 1979 struct aiocblist *cbe, *cbn; 1980 struct file *fp; 1981 struct socket *so; 1982 int error; 1983 int remove; 1984 int cancelled = 0; 1985 int notcancelled = 0; 1986 struct vnode *vp; 1987 1988 /* Lookup file object. */ 1989 error = fget(td, uap->fd, 0, &fp); 1990 if (error) 1991 return (error); 1992 1993 ki = p->p_aioinfo; 1994 if (ki == NULL) 1995 goto done; 1996 1997 if (fp->f_type == DTYPE_VNODE) { 1998 vp = fp->f_vnode; 1999 if (vn_isdisk(vp, &error)) { 2000 fdrop(fp, td); 2001 td->td_retval[0] = AIO_NOTCANCELED; 2002 return (0); 2003 } 2004 } 2005 2006 AIO_LOCK(ki); 2007 TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) { 2008 if ((uap->fd == cbe->uaiocb.aio_fildes) && 2009 ((uap->aiocbp == NULL) || 2010 (uap->aiocbp == cbe->uuaiocb))) { 2011 remove = 0; 2012 2013 mtx_lock(&aio_job_mtx); 2014 if (cbe->jobstate == JOBST_JOBQGLOBAL) { 2015 TAILQ_REMOVE(&aio_jobs, cbe, list); 2016 remove = 1; 2017 } else if (cbe->jobstate == JOBST_JOBQSOCK) { 2018 MPASS(fp->f_type == DTYPE_SOCKET); 2019 so = fp->f_data; 2020 TAILQ_REMOVE(&so->so_aiojobq, cbe, list); 2021 remove = 1; 2022 } else if (cbe->jobstate == JOBST_JOBQSYNC) { 2023 TAILQ_REMOVE(&ki->kaio_syncqueue, cbe, list); 2024 remove = 1; 2025 } 2026 mtx_unlock(&aio_job_mtx); 2027 2028 if (remove) { 2029 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); 2030 cbe->uaiocb._aiocb_private.status = -1; 2031 cbe->uaiocb._aiocb_private.error = ECANCELED; 2032 aio_bio_done_notify(p, cbe, DONE_QUEUE); 2033 cancelled++; 2034 } else { 2035 notcancelled++; 2036 } 2037 if (uap->aiocbp != NULL) 2038 break; 2039 } 2040 } 2041 AIO_UNLOCK(ki); 2042 2043 done: 2044 fdrop(fp, td); 2045 2046 if (uap->aiocbp != NULL) { 2047 if (cancelled) { 2048 td->td_retval[0] = AIO_CANCELED; 2049 return (0); 2050 } 2051 } 2052 2053 if (notcancelled) { 2054 td->td_retval[0] = AIO_NOTCANCELED; 2055 return (0); 2056 } 2057 2058 if (cancelled) { 2059 td->td_retval[0] = AIO_CANCELED; 2060 return (0); 2061 } 2062 2063 td->td_retval[0] = AIO_ALLDONE; 2064 2065 return (0); 2066 } 2067 2068 /* 2069 * aio_error is implemented in the kernel level for compatibility purposes 2070 * only. For a user mode async implementation, it would be best to do it in 2071 * a userland subroutine. 2072 */ 2073 static int 2074 kern_aio_error(struct thread *td, struct aiocb *aiocbp, struct aiocb_ops *ops) 2075 { 2076 struct proc *p = td->td_proc; 2077 struct aiocblist *cb; 2078 struct kaioinfo *ki; 2079 int status; 2080 2081 ki = p->p_aioinfo; 2082 if (ki == NULL) { 2083 td->td_retval[0] = EINVAL; 2084 return (0); 2085 } 2086 2087 AIO_LOCK(ki); 2088 TAILQ_FOREACH(cb, &ki->kaio_all, allist) { 2089 if (cb->uuaiocb == aiocbp) { 2090 if (cb->jobstate == JOBST_JOBFINISHED) 2091 td->td_retval[0] = 2092 cb->uaiocb._aiocb_private.error; 2093 else 2094 td->td_retval[0] = EINPROGRESS; 2095 AIO_UNLOCK(ki); 2096 return (0); 2097 } 2098 } 2099 AIO_UNLOCK(ki); 2100 2101 /* 2102 * Hack for failure of aio_aqueue. 2103 */ 2104 status = ops->fetch_status(aiocbp); 2105 if (status == -1) { 2106 td->td_retval[0] = ops->fetch_error(aiocbp); 2107 return (0); 2108 } 2109 2110 td->td_retval[0] = EINVAL; 2111 return (0); 2112 } 2113 2114 int 2115 sys_aio_error(struct thread *td, struct aio_error_args *uap) 2116 { 2117 2118 return (kern_aio_error(td, uap->aiocbp, &aiocb_ops)); 2119 } 2120 2121 /* syscall - asynchronous read from a file (REALTIME) */ 2122 int 2123 sys_oaio_read(struct thread *td, struct oaio_read_args *uap) 2124 { 2125 2126 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 2127 &aiocb_ops_osigevent)); 2128 } 2129 2130 int 2131 sys_aio_read(struct thread *td, struct aio_read_args *uap) 2132 { 2133 2134 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, &aiocb_ops)); 2135 } 2136 2137 /* syscall - asynchronous write to a file (REALTIME) */ 2138 int 2139 sys_oaio_write(struct thread *td, struct oaio_write_args *uap) 2140 { 2141 2142 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 2143 &aiocb_ops_osigevent)); 2144 } 2145 2146 int 2147 sys_aio_write(struct thread *td, struct aio_write_args *uap) 2148 { 2149 2150 return (aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, &aiocb_ops)); 2151 } 2152 2153 static int 2154 kern_lio_listio(struct thread *td, int mode, struct aiocb * const *uacb_list, 2155 struct aiocb **acb_list, int nent, struct sigevent *sig, 2156 struct aiocb_ops *ops) 2157 { 2158 struct proc *p = td->td_proc; 2159 struct aiocb *iocb; 2160 struct kaioinfo *ki; 2161 struct aioliojob *lj; 2162 struct kevent kev; 2163 int error; 2164 int nerror; 2165 int i; 2166 2167 if ((mode != LIO_NOWAIT) && (mode != LIO_WAIT)) 2168 return (EINVAL); 2169 2170 if (nent < 0 || nent > AIO_LISTIO_MAX) 2171 return (EINVAL); 2172 2173 if (p->p_aioinfo == NULL) 2174 aio_init_aioinfo(p); 2175 2176 ki = p->p_aioinfo; 2177 2178 lj = uma_zalloc(aiolio_zone, M_WAITOK); 2179 lj->lioj_flags = 0; 2180 lj->lioj_count = 0; 2181 lj->lioj_finished_count = 0; 2182 knlist_init_mtx(&lj->klist, AIO_MTX(ki)); 2183 ksiginfo_init(&lj->lioj_ksi); 2184 2185 /* 2186 * Setup signal. 2187 */ 2188 if (sig && (mode == LIO_NOWAIT)) { 2189 bcopy(sig, &lj->lioj_signal, sizeof(lj->lioj_signal)); 2190 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { 2191 /* Assume only new style KEVENT */ 2192 kev.filter = EVFILT_LIO; 2193 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; 2194 kev.ident = (uintptr_t)uacb_list; /* something unique */ 2195 kev.data = (intptr_t)lj; 2196 /* pass user defined sigval data */ 2197 kev.udata = lj->lioj_signal.sigev_value.sival_ptr; 2198 error = kqfd_register( 2199 lj->lioj_signal.sigev_notify_kqueue, &kev, td, 1); 2200 if (error) { 2201 uma_zfree(aiolio_zone, lj); 2202 return (error); 2203 } 2204 } else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) { 2205 ; 2206 } else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || 2207 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) { 2208 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { 2209 uma_zfree(aiolio_zone, lj); 2210 return EINVAL; 2211 } 2212 lj->lioj_flags |= LIOJ_SIGNAL; 2213 } else { 2214 uma_zfree(aiolio_zone, lj); 2215 return EINVAL; 2216 } 2217 } 2218 2219 AIO_LOCK(ki); 2220 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); 2221 /* 2222 * Add extra aiocb count to avoid the lio to be freed 2223 * by other threads doing aio_waitcomplete or aio_return, 2224 * and prevent event from being sent until we have queued 2225 * all tasks. 2226 */ 2227 lj->lioj_count = 1; 2228 AIO_UNLOCK(ki); 2229 2230 /* 2231 * Get pointers to the list of I/O requests. 2232 */ 2233 nerror = 0; 2234 for (i = 0; i < nent; i++) { 2235 iocb = acb_list[i]; 2236 if (iocb != NULL) { 2237 error = aio_aqueue(td, iocb, lj, LIO_NOP, ops); 2238 if (error != 0) 2239 nerror++; 2240 } 2241 } 2242 2243 error = 0; 2244 AIO_LOCK(ki); 2245 if (mode == LIO_WAIT) { 2246 while (lj->lioj_count - 1 != lj->lioj_finished_count) { 2247 ki->kaio_flags |= KAIO_WAKEUP; 2248 error = msleep(&p->p_aioinfo, AIO_MTX(ki), 2249 PRIBIO | PCATCH, "aiospn", 0); 2250 if (error == ERESTART) 2251 error = EINTR; 2252 if (error) 2253 break; 2254 } 2255 } else { 2256 if (lj->lioj_count - 1 == lj->lioj_finished_count) { 2257 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { 2258 lj->lioj_flags |= LIOJ_KEVENT_POSTED; 2259 KNOTE_LOCKED(&lj->klist, 1); 2260 } 2261 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) 2262 == LIOJ_SIGNAL 2263 && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || 2264 lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) { 2265 aio_sendsig(p, &lj->lioj_signal, 2266 &lj->lioj_ksi); 2267 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2268 } 2269 } 2270 } 2271 lj->lioj_count--; 2272 if (lj->lioj_count == 0) { 2273 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 2274 knlist_delete(&lj->klist, curthread, 1); 2275 PROC_LOCK(p); 2276 sigqueue_take(&lj->lioj_ksi); 2277 PROC_UNLOCK(p); 2278 AIO_UNLOCK(ki); 2279 uma_zfree(aiolio_zone, lj); 2280 } else 2281 AIO_UNLOCK(ki); 2282 2283 if (nerror) 2284 return (EIO); 2285 return (error); 2286 } 2287 2288 /* syscall - list directed I/O (REALTIME) */ 2289 int 2290 sys_olio_listio(struct thread *td, struct olio_listio_args *uap) 2291 { 2292 struct aiocb **acb_list; 2293 struct sigevent *sigp, sig; 2294 struct osigevent osig; 2295 int error, nent; 2296 2297 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 2298 return (EINVAL); 2299 2300 nent = uap->nent; 2301 if (nent < 0 || nent > AIO_LISTIO_MAX) 2302 return (EINVAL); 2303 2304 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2305 error = copyin(uap->sig, &osig, sizeof(osig)); 2306 if (error) 2307 return (error); 2308 error = convert_old_sigevent(&osig, &sig); 2309 if (error) 2310 return (error); 2311 sigp = &sig; 2312 } else 2313 sigp = NULL; 2314 2315 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 2316 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0])); 2317 if (error == 0) 2318 error = kern_lio_listio(td, uap->mode, 2319 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp, 2320 &aiocb_ops_osigevent); 2321 free(acb_list, M_LIO); 2322 return (error); 2323 } 2324 2325 /* syscall - list directed I/O (REALTIME) */ 2326 int 2327 sys_lio_listio(struct thread *td, struct lio_listio_args *uap) 2328 { 2329 struct aiocb **acb_list; 2330 struct sigevent *sigp, sig; 2331 int error, nent; 2332 2333 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 2334 return (EINVAL); 2335 2336 nent = uap->nent; 2337 if (nent < 0 || nent > AIO_LISTIO_MAX) 2338 return (EINVAL); 2339 2340 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2341 error = copyin(uap->sig, &sig, sizeof(sig)); 2342 if (error) 2343 return (error); 2344 sigp = &sig; 2345 } else 2346 sigp = NULL; 2347 2348 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 2349 error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0])); 2350 if (error == 0) 2351 error = kern_lio_listio(td, uap->mode, uap->acb_list, acb_list, 2352 nent, sigp, &aiocb_ops); 2353 free(acb_list, M_LIO); 2354 return (error); 2355 } 2356 2357 /* 2358 * Called from interrupt thread for physio, we should return as fast 2359 * as possible, so we schedule a biohelper task. 2360 */ 2361 static void 2362 aio_physwakeup(struct buf *bp) 2363 { 2364 struct aiocblist *aiocbe; 2365 2366 aiocbe = (struct aiocblist *)bp->b_caller1; 2367 taskqueue_enqueue(taskqueue_aiod_bio, &aiocbe->biotask); 2368 } 2369 2370 /* 2371 * Task routine to perform heavy tasks, process wakeup, and signals. 2372 */ 2373 static void 2374 biohelper(void *context, int pending) 2375 { 2376 struct aiocblist *aiocbe = context; 2377 struct buf *bp; 2378 struct proc *userp; 2379 struct kaioinfo *ki; 2380 int nblks; 2381 2382 bp = aiocbe->bp; 2383 userp = aiocbe->userproc; 2384 ki = userp->p_aioinfo; 2385 AIO_LOCK(ki); 2386 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid; 2387 aiocbe->uaiocb._aiocb_private.error = 0; 2388 if (bp->b_ioflags & BIO_ERROR) 2389 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 2390 nblks = btodb(aiocbe->uaiocb.aio_nbytes); 2391 if (aiocbe->uaiocb.aio_lio_opcode == LIO_WRITE) 2392 aiocbe->outputcharge += nblks; 2393 else 2394 aiocbe->inputcharge += nblks; 2395 aiocbe->bp = NULL; 2396 TAILQ_REMOVE(&userp->p_aioinfo->kaio_bufqueue, aiocbe, plist); 2397 ki->kaio_buffer_count--; 2398 aio_bio_done_notify(userp, aiocbe, DONE_BUF); 2399 AIO_UNLOCK(ki); 2400 2401 /* Release mapping into kernel space. */ 2402 vunmapbuf(bp); 2403 relpbuf(bp, NULL); 2404 atomic_subtract_int(&num_buf_aio, 1); 2405 } 2406 2407 /* syscall - wait for the next completion of an aio request */ 2408 static int 2409 kern_aio_waitcomplete(struct thread *td, struct aiocb **aiocbp, 2410 struct timespec *ts, struct aiocb_ops *ops) 2411 { 2412 struct proc *p = td->td_proc; 2413 struct timeval atv; 2414 struct kaioinfo *ki; 2415 struct aiocblist *cb; 2416 struct aiocb *uuaiocb; 2417 int error, status, timo; 2418 2419 ops->store_aiocb(aiocbp, NULL); 2420 2421 timo = 0; 2422 if (ts) { 2423 if ((ts->tv_nsec < 0) || (ts->tv_nsec >= 1000000000)) 2424 return (EINVAL); 2425 2426 TIMESPEC_TO_TIMEVAL(&atv, ts); 2427 if (itimerfix(&atv)) 2428 return (EINVAL); 2429 timo = tvtohz(&atv); 2430 } 2431 2432 if (p->p_aioinfo == NULL) 2433 aio_init_aioinfo(p); 2434 ki = p->p_aioinfo; 2435 2436 error = 0; 2437 cb = NULL; 2438 AIO_LOCK(ki); 2439 while ((cb = TAILQ_FIRST(&ki->kaio_done)) == NULL) { 2440 ki->kaio_flags |= KAIO_WAKEUP; 2441 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH, 2442 "aiowc", timo); 2443 if (timo && error == ERESTART) 2444 error = EINTR; 2445 if (error) 2446 break; 2447 } 2448 2449 if (cb != NULL) { 2450 MPASS(cb->jobstate == JOBST_JOBFINISHED); 2451 uuaiocb = cb->uuaiocb; 2452 status = cb->uaiocb._aiocb_private.status; 2453 error = cb->uaiocb._aiocb_private.error; 2454 td->td_retval[0] = status; 2455 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 2456 td->td_ru.ru_oublock += cb->outputcharge; 2457 cb->outputcharge = 0; 2458 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 2459 td->td_ru.ru_inblock += cb->inputcharge; 2460 cb->inputcharge = 0; 2461 } 2462 aio_free_entry(cb); 2463 AIO_UNLOCK(ki); 2464 ops->store_aiocb(aiocbp, uuaiocb); 2465 ops->store_error(uuaiocb, error); 2466 ops->store_status(uuaiocb, status); 2467 } else 2468 AIO_UNLOCK(ki); 2469 2470 return (error); 2471 } 2472 2473 int 2474 sys_aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap) 2475 { 2476 struct timespec ts, *tsp; 2477 int error; 2478 2479 if (uap->timeout) { 2480 /* Get timespec struct. */ 2481 error = copyin(uap->timeout, &ts, sizeof(ts)); 2482 if (error) 2483 return (error); 2484 tsp = &ts; 2485 } else 2486 tsp = NULL; 2487 2488 return (kern_aio_waitcomplete(td, uap->aiocbp, tsp, &aiocb_ops)); 2489 } 2490 2491 static int 2492 kern_aio_fsync(struct thread *td, int op, struct aiocb *aiocbp, 2493 struct aiocb_ops *ops) 2494 { 2495 struct proc *p = td->td_proc; 2496 struct kaioinfo *ki; 2497 2498 if (op != O_SYNC) /* XXX lack of O_DSYNC */ 2499 return (EINVAL); 2500 ki = p->p_aioinfo; 2501 if (ki == NULL) 2502 aio_init_aioinfo(p); 2503 return (aio_aqueue(td, aiocbp, NULL, LIO_SYNC, ops)); 2504 } 2505 2506 int 2507 sys_aio_fsync(struct thread *td, struct aio_fsync_args *uap) 2508 { 2509 2510 return (kern_aio_fsync(td, uap->op, uap->aiocbp, &aiocb_ops)); 2511 } 2512 2513 /* kqueue attach function */ 2514 static int 2515 filt_aioattach(struct knote *kn) 2516 { 2517 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2518 2519 /* 2520 * The aiocbe pointer must be validated before using it, so 2521 * registration is restricted to the kernel; the user cannot 2522 * set EV_FLAG1. 2523 */ 2524 if ((kn->kn_flags & EV_FLAG1) == 0) 2525 return (EPERM); 2526 kn->kn_ptr.p_aio = aiocbe; 2527 kn->kn_flags &= ~EV_FLAG1; 2528 2529 knlist_add(&aiocbe->klist, kn, 0); 2530 2531 return (0); 2532 } 2533 2534 /* kqueue detach function */ 2535 static void 2536 filt_aiodetach(struct knote *kn) 2537 { 2538 struct knlist *knl; 2539 2540 knl = &kn->kn_ptr.p_aio->klist; 2541 knl->kl_lock(knl->kl_lockarg); 2542 if (!knlist_empty(knl)) 2543 knlist_remove(knl, kn, 1); 2544 knl->kl_unlock(knl->kl_lockarg); 2545 } 2546 2547 /* kqueue filter function */ 2548 /*ARGSUSED*/ 2549 static int 2550 filt_aio(struct knote *kn, long hint) 2551 { 2552 struct aiocblist *aiocbe = kn->kn_ptr.p_aio; 2553 2554 kn->kn_data = aiocbe->uaiocb._aiocb_private.error; 2555 if (aiocbe->jobstate != JOBST_JOBFINISHED) 2556 return (0); 2557 kn->kn_flags |= EV_EOF; 2558 return (1); 2559 } 2560 2561 /* kqueue attach function */ 2562 static int 2563 filt_lioattach(struct knote *kn) 2564 { 2565 struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata; 2566 2567 /* 2568 * The aioliojob pointer must be validated before using it, so 2569 * registration is restricted to the kernel; the user cannot 2570 * set EV_FLAG1. 2571 */ 2572 if ((kn->kn_flags & EV_FLAG1) == 0) 2573 return (EPERM); 2574 kn->kn_ptr.p_lio = lj; 2575 kn->kn_flags &= ~EV_FLAG1; 2576 2577 knlist_add(&lj->klist, kn, 0); 2578 2579 return (0); 2580 } 2581 2582 /* kqueue detach function */ 2583 static void 2584 filt_liodetach(struct knote *kn) 2585 { 2586 struct knlist *knl; 2587 2588 knl = &kn->kn_ptr.p_lio->klist; 2589 knl->kl_lock(knl->kl_lockarg); 2590 if (!knlist_empty(knl)) 2591 knlist_remove(knl, kn, 1); 2592 knl->kl_unlock(knl->kl_lockarg); 2593 } 2594 2595 /* kqueue filter function */ 2596 /*ARGSUSED*/ 2597 static int 2598 filt_lio(struct knote *kn, long hint) 2599 { 2600 struct aioliojob * lj = kn->kn_ptr.p_lio; 2601 2602 return (lj->lioj_flags & LIOJ_KEVENT_POSTED); 2603 } 2604 2605 #ifdef COMPAT_FREEBSD32 2606 2607 struct __aiocb_private32 { 2608 int32_t status; 2609 int32_t error; 2610 uint32_t kernelinfo; 2611 }; 2612 2613 typedef struct oaiocb32 { 2614 int aio_fildes; /* File descriptor */ 2615 uint64_t aio_offset __packed; /* File offset for I/O */ 2616 uint32_t aio_buf; /* I/O buffer in process space */ 2617 uint32_t aio_nbytes; /* Number of bytes for I/O */ 2618 struct osigevent32 aio_sigevent; /* Signal to deliver */ 2619 int aio_lio_opcode; /* LIO opcode */ 2620 int aio_reqprio; /* Request priority -- ignored */ 2621 struct __aiocb_private32 _aiocb_private; 2622 } oaiocb32_t; 2623 2624 typedef struct aiocb32 { 2625 int32_t aio_fildes; /* File descriptor */ 2626 uint64_t aio_offset __packed; /* File offset for I/O */ 2627 uint32_t aio_buf; /* I/O buffer in process space */ 2628 uint32_t aio_nbytes; /* Number of bytes for I/O */ 2629 int __spare__[2]; 2630 uint32_t __spare2__; 2631 int aio_lio_opcode; /* LIO opcode */ 2632 int aio_reqprio; /* Request priority -- ignored */ 2633 struct __aiocb_private32 _aiocb_private; 2634 struct sigevent32 aio_sigevent; /* Signal to deliver */ 2635 } aiocb32_t; 2636 2637 static int 2638 convert_old_sigevent32(struct osigevent32 *osig, struct sigevent *nsig) 2639 { 2640 2641 /* 2642 * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are 2643 * supported by AIO with the old sigevent structure. 2644 */ 2645 CP(*osig, *nsig, sigev_notify); 2646 switch (nsig->sigev_notify) { 2647 case SIGEV_NONE: 2648 break; 2649 case SIGEV_SIGNAL: 2650 nsig->sigev_signo = osig->__sigev_u.__sigev_signo; 2651 break; 2652 case SIGEV_KEVENT: 2653 nsig->sigev_notify_kqueue = 2654 osig->__sigev_u.__sigev_notify_kqueue; 2655 PTRIN_CP(*osig, *nsig, sigev_value.sival_ptr); 2656 break; 2657 default: 2658 return (EINVAL); 2659 } 2660 return (0); 2661 } 2662 2663 static int 2664 aiocb32_copyin_old_sigevent(struct aiocb *ujob, struct aiocb *kjob) 2665 { 2666 struct oaiocb32 job32; 2667 int error; 2668 2669 bzero(kjob, sizeof(struct aiocb)); 2670 error = copyin(ujob, &job32, sizeof(job32)); 2671 if (error) 2672 return (error); 2673 2674 CP(job32, *kjob, aio_fildes); 2675 CP(job32, *kjob, aio_offset); 2676 PTRIN_CP(job32, *kjob, aio_buf); 2677 CP(job32, *kjob, aio_nbytes); 2678 CP(job32, *kjob, aio_lio_opcode); 2679 CP(job32, *kjob, aio_reqprio); 2680 CP(job32, *kjob, _aiocb_private.status); 2681 CP(job32, *kjob, _aiocb_private.error); 2682 PTRIN_CP(job32, *kjob, _aiocb_private.kernelinfo); 2683 return (convert_old_sigevent32(&job32.aio_sigevent, 2684 &kjob->aio_sigevent)); 2685 } 2686 2687 static int 2688 convert_sigevent32(struct sigevent32 *sig32, struct sigevent *sig) 2689 { 2690 2691 CP(*sig32, *sig, sigev_notify); 2692 switch (sig->sigev_notify) { 2693 case SIGEV_NONE: 2694 break; 2695 case SIGEV_THREAD_ID: 2696 CP(*sig32, *sig, sigev_notify_thread_id); 2697 /* FALLTHROUGH */ 2698 case SIGEV_SIGNAL: 2699 CP(*sig32, *sig, sigev_signo); 2700 break; 2701 case SIGEV_KEVENT: 2702 CP(*sig32, *sig, sigev_notify_kqueue); 2703 CP(*sig32, *sig, sigev_notify_kevent_flags); 2704 PTRIN_CP(*sig32, *sig, sigev_value.sival_ptr); 2705 break; 2706 default: 2707 return (EINVAL); 2708 } 2709 return (0); 2710 } 2711 2712 static int 2713 aiocb32_copyin(struct aiocb *ujob, struct aiocb *kjob) 2714 { 2715 struct aiocb32 job32; 2716 int error; 2717 2718 error = copyin(ujob, &job32, sizeof(job32)); 2719 if (error) 2720 return (error); 2721 CP(job32, *kjob, aio_fildes); 2722 CP(job32, *kjob, aio_offset); 2723 PTRIN_CP(job32, *kjob, aio_buf); 2724 CP(job32, *kjob, aio_nbytes); 2725 CP(job32, *kjob, aio_lio_opcode); 2726 CP(job32, *kjob, aio_reqprio); 2727 CP(job32, *kjob, _aiocb_private.status); 2728 CP(job32, *kjob, _aiocb_private.error); 2729 PTRIN_CP(job32, *kjob, _aiocb_private.kernelinfo); 2730 return (convert_sigevent32(&job32.aio_sigevent, &kjob->aio_sigevent)); 2731 } 2732 2733 static long 2734 aiocb32_fetch_status(struct aiocb *ujob) 2735 { 2736 struct aiocb32 *ujob32; 2737 2738 ujob32 = (struct aiocb32 *)ujob; 2739 return (fuword32(&ujob32->_aiocb_private.status)); 2740 } 2741 2742 static long 2743 aiocb32_fetch_error(struct aiocb *ujob) 2744 { 2745 struct aiocb32 *ujob32; 2746 2747 ujob32 = (struct aiocb32 *)ujob; 2748 return (fuword32(&ujob32->_aiocb_private.error)); 2749 } 2750 2751 static int 2752 aiocb32_store_status(struct aiocb *ujob, long status) 2753 { 2754 struct aiocb32 *ujob32; 2755 2756 ujob32 = (struct aiocb32 *)ujob; 2757 return (suword32(&ujob32->_aiocb_private.status, status)); 2758 } 2759 2760 static int 2761 aiocb32_store_error(struct aiocb *ujob, long error) 2762 { 2763 struct aiocb32 *ujob32; 2764 2765 ujob32 = (struct aiocb32 *)ujob; 2766 return (suword32(&ujob32->_aiocb_private.error, error)); 2767 } 2768 2769 static int 2770 aiocb32_store_kernelinfo(struct aiocb *ujob, long jobref) 2771 { 2772 struct aiocb32 *ujob32; 2773 2774 ujob32 = (struct aiocb32 *)ujob; 2775 return (suword32(&ujob32->_aiocb_private.kernelinfo, jobref)); 2776 } 2777 2778 static int 2779 aiocb32_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob) 2780 { 2781 2782 return (suword32(ujobp, (long)ujob)); 2783 } 2784 2785 static struct aiocb_ops aiocb32_ops = { 2786 .copyin = aiocb32_copyin, 2787 .fetch_status = aiocb32_fetch_status, 2788 .fetch_error = aiocb32_fetch_error, 2789 .store_status = aiocb32_store_status, 2790 .store_error = aiocb32_store_error, 2791 .store_kernelinfo = aiocb32_store_kernelinfo, 2792 .store_aiocb = aiocb32_store_aiocb, 2793 }; 2794 2795 static struct aiocb_ops aiocb32_ops_osigevent = { 2796 .copyin = aiocb32_copyin_old_sigevent, 2797 .fetch_status = aiocb32_fetch_status, 2798 .fetch_error = aiocb32_fetch_error, 2799 .store_status = aiocb32_store_status, 2800 .store_error = aiocb32_store_error, 2801 .store_kernelinfo = aiocb32_store_kernelinfo, 2802 .store_aiocb = aiocb32_store_aiocb, 2803 }; 2804 2805 int 2806 freebsd32_aio_return(struct thread *td, struct freebsd32_aio_return_args *uap) 2807 { 2808 2809 return (kern_aio_return(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops)); 2810 } 2811 2812 int 2813 freebsd32_aio_suspend(struct thread *td, struct freebsd32_aio_suspend_args *uap) 2814 { 2815 struct timespec32 ts32; 2816 struct timespec ts, *tsp; 2817 struct aiocb **ujoblist; 2818 uint32_t *ujoblist32; 2819 int error, i; 2820 2821 if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX) 2822 return (EINVAL); 2823 2824 if (uap->timeout) { 2825 /* Get timespec struct. */ 2826 if ((error = copyin(uap->timeout, &ts32, sizeof(ts32))) != 0) 2827 return (error); 2828 CP(ts32, ts, tv_sec); 2829 CP(ts32, ts, tv_nsec); 2830 tsp = &ts; 2831 } else 2832 tsp = NULL; 2833 2834 ujoblist = uma_zalloc(aiol_zone, M_WAITOK); 2835 ujoblist32 = (uint32_t *)ujoblist; 2836 error = copyin(uap->aiocbp, ujoblist32, uap->nent * 2837 sizeof(ujoblist32[0])); 2838 if (error == 0) { 2839 for (i = uap->nent; i > 0; i--) 2840 ujoblist[i] = PTRIN(ujoblist32[i]); 2841 2842 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp); 2843 } 2844 uma_zfree(aiol_zone, ujoblist); 2845 return (error); 2846 } 2847 2848 int 2849 freebsd32_aio_cancel(struct thread *td, struct freebsd32_aio_cancel_args *uap) 2850 { 2851 2852 return (sys_aio_cancel(td, (struct aio_cancel_args *)uap)); 2853 } 2854 2855 int 2856 freebsd32_aio_error(struct thread *td, struct freebsd32_aio_error_args *uap) 2857 { 2858 2859 return (kern_aio_error(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops)); 2860 } 2861 2862 int 2863 freebsd32_oaio_read(struct thread *td, struct freebsd32_oaio_read_args *uap) 2864 { 2865 2866 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 2867 &aiocb32_ops_osigevent)); 2868 } 2869 2870 int 2871 freebsd32_aio_read(struct thread *td, struct freebsd32_aio_read_args *uap) 2872 { 2873 2874 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 2875 &aiocb32_ops)); 2876 } 2877 2878 int 2879 freebsd32_oaio_write(struct thread *td, struct freebsd32_oaio_write_args *uap) 2880 { 2881 2882 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 2883 &aiocb32_ops_osigevent)); 2884 } 2885 2886 int 2887 freebsd32_aio_write(struct thread *td, struct freebsd32_aio_write_args *uap) 2888 { 2889 2890 return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 2891 &aiocb32_ops)); 2892 } 2893 2894 int 2895 freebsd32_aio_waitcomplete(struct thread *td, 2896 struct freebsd32_aio_waitcomplete_args *uap) 2897 { 2898 struct timespec32 ts32; 2899 struct timespec ts, *tsp; 2900 int error; 2901 2902 if (uap->timeout) { 2903 /* Get timespec struct. */ 2904 error = copyin(uap->timeout, &ts32, sizeof(ts32)); 2905 if (error) 2906 return (error); 2907 CP(ts32, ts, tv_sec); 2908 CP(ts32, ts, tv_nsec); 2909 tsp = &ts; 2910 } else 2911 tsp = NULL; 2912 2913 return (kern_aio_waitcomplete(td, (struct aiocb **)uap->aiocbp, tsp, 2914 &aiocb32_ops)); 2915 } 2916 2917 int 2918 freebsd32_aio_fsync(struct thread *td, struct freebsd32_aio_fsync_args *uap) 2919 { 2920 2921 return (kern_aio_fsync(td, uap->op, (struct aiocb *)uap->aiocbp, 2922 &aiocb32_ops)); 2923 } 2924 2925 int 2926 freebsd32_olio_listio(struct thread *td, struct freebsd32_olio_listio_args *uap) 2927 { 2928 struct aiocb **acb_list; 2929 struct sigevent *sigp, sig; 2930 struct osigevent32 osig; 2931 uint32_t *acb_list32; 2932 int error, i, nent; 2933 2934 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 2935 return (EINVAL); 2936 2937 nent = uap->nent; 2938 if (nent < 0 || nent > AIO_LISTIO_MAX) 2939 return (EINVAL); 2940 2941 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2942 error = copyin(uap->sig, &osig, sizeof(osig)); 2943 if (error) 2944 return (error); 2945 error = convert_old_sigevent32(&osig, &sig); 2946 if (error) 2947 return (error); 2948 sigp = &sig; 2949 } else 2950 sigp = NULL; 2951 2952 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK); 2953 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t)); 2954 if (error) { 2955 free(acb_list32, M_LIO); 2956 return (error); 2957 } 2958 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 2959 for (i = 0; i < nent; i++) 2960 acb_list[i] = PTRIN(acb_list32[i]); 2961 free(acb_list32, M_LIO); 2962 2963 error = kern_lio_listio(td, uap->mode, 2964 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp, 2965 &aiocb32_ops_osigevent); 2966 free(acb_list, M_LIO); 2967 return (error); 2968 } 2969 2970 int 2971 freebsd32_lio_listio(struct thread *td, struct freebsd32_lio_listio_args *uap) 2972 { 2973 struct aiocb **acb_list; 2974 struct sigevent *sigp, sig; 2975 struct sigevent32 sig32; 2976 uint32_t *acb_list32; 2977 int error, i, nent; 2978 2979 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 2980 return (EINVAL); 2981 2982 nent = uap->nent; 2983 if (nent < 0 || nent > AIO_LISTIO_MAX) 2984 return (EINVAL); 2985 2986 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2987 error = copyin(uap->sig, &sig32, sizeof(sig32)); 2988 if (error) 2989 return (error); 2990 error = convert_sigevent32(&sig32, &sig); 2991 if (error) 2992 return (error); 2993 sigp = &sig; 2994 } else 2995 sigp = NULL; 2996 2997 acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK); 2998 error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t)); 2999 if (error) { 3000 free(acb_list32, M_LIO); 3001 return (error); 3002 } 3003 acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK); 3004 for (i = 0; i < nent; i++) 3005 acb_list[i] = PTRIN(acb_list32[i]); 3006 free(acb_list32, M_LIO); 3007 3008 error = kern_lio_listio(td, uap->mode, 3009 (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp, 3010 &aiocb32_ops); 3011 free(acb_list, M_LIO); 3012 return (error); 3013 } 3014 3015 #endif
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