/*- * Copyright (c) 1997 John S. Dyson. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. John S. Dyson's name may not be used to endorse or promote products * derived from this software without specific prior written permission. * * DISCLAIMER: This code isn't warranted to do anything useful. Anything * bad that happens because of using this software isn't the responsibility * of the author. This software is distributed AS-IS. */ /* * This file contains support for the POSIX 1003.1B AIO/LIO facility. */ #include __FBSDID("$FreeBSD: head/sys/kern/vfs_aio.c 154706 2006-01-23 10:27:15Z davidxu $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "opt_vfs_aio.h" /* * Counter for allocating reference ids to new jobs. Wrapped to 1 on * overflow. */ static long jobrefid; #define JOBST_NULL 0x0 #define JOBST_JOBQSOCK 0x1 #define JOBST_JOBQGLOBAL 0x2 #define JOBST_JOBRUNNING 0x3 #define JOBST_JOBFINISHED 0x4 #define JOBST_JOBQBUF 0x5 #ifndef MAX_AIO_PER_PROC #define MAX_AIO_PER_PROC 32 #endif #ifndef MAX_AIO_QUEUE_PER_PROC #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */ #endif #ifndef MAX_AIO_PROCS #define MAX_AIO_PROCS 32 #endif #ifndef MAX_AIO_QUEUE #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */ #endif #ifndef TARGET_AIO_PROCS #define TARGET_AIO_PROCS 4 #endif #ifndef MAX_BUF_AIO #define MAX_BUF_AIO 16 #endif #ifndef AIOD_TIMEOUT_DEFAULT #define AIOD_TIMEOUT_DEFAULT (10 * hz) #endif #ifndef AIOD_LIFETIME_DEFAULT #define AIOD_LIFETIME_DEFAULT (30 * hz) #endif static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management"); static int max_aio_procs = MAX_AIO_PROCS; SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, CTLFLAG_RW, &max_aio_procs, 0, "Maximum number of kernel threads to use for handling async IO "); static int num_aio_procs = 0; SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, CTLFLAG_RD, &num_aio_procs, 0, "Number of presently active kernel threads for async IO"); /* * The code will adjust the actual number of AIO processes towards this * number when it gets a chance. */ static int target_aio_procs = TARGET_AIO_PROCS; SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 0, "Preferred number of ready kernel threads for async IO"); static int max_queue_count = MAX_AIO_QUEUE; SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, "Maximum number of aio requests to queue, globally"); static int num_queue_count = 0; SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, "Number of queued aio requests"); static int num_buf_aio = 0; SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, "Number of aio requests presently handled by the buf subsystem"); /* Number of async I/O thread in the process of being started */ /* XXX This should be local to aio_aqueue() */ static int num_aio_resv_start = 0; static int aiod_timeout; SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0, "Timeout value for synchronous aio operations"); static int aiod_lifetime; SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, "Maximum lifetime for idle aiod"); static int unloadable = 0; SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0, "Allow unload of aio (not recommended)"); static int max_aio_per_proc = MAX_AIO_PER_PROC; SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 0, "Maximum active aio requests per process (stored in the process)"); static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, &max_aio_queue_per_proc, 0, "Maximum queued aio requests per process (stored in the process)"); static int max_buf_aio = MAX_BUF_AIO; SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, "Maximum buf aio requests per process (stored in the process)"); typedef struct oaiocb { int aio_fildes; /* File descriptor */ off_t aio_offset; /* File offset for I/O */ volatile void *aio_buf; /* I/O buffer in process space */ size_t aio_nbytes; /* Number of bytes for I/O */ struct osigevent aio_sigevent; /* Signal to deliver */ int aio_lio_opcode; /* LIO opcode */ int aio_reqprio; /* Request priority -- ignored */ struct __aiocb_private _aiocb_private; } oaiocb_t; struct aiocblist { TAILQ_ENTRY(aiocblist) list; /* List of jobs */ TAILQ_ENTRY(aiocblist) plist; /* List of jobs for proc */ TAILQ_ENTRY(aiocblist) allist; int jobflags; int jobstate; int inputcharge; int outputcharge; struct buf *bp; /* Buffer pointer */ struct proc *userproc; /* User process */ struct ucred *cred; /* Active credential when created */ struct file *fd_file; /* Pointer to file structure */ struct aioliojob *lio; /* Optional lio job */ struct aiocb *uuaiocb; /* Pointer in userspace of aiocb */ struct knlist klist; /* list of knotes */ struct aiocb uaiocb; /* Kernel I/O control block */ ksiginfo_t ksi; /* Realtime signal info */ struct task biotask; }; /* jobflags */ #define AIOCBLIST_RUNDOWN 0x04 #define AIOCBLIST_DONE 0x10 #define AIOCBLIST_BUFDONE 0x20 /* * AIO process info */ #define AIOP_FREE 0x1 /* proc on free queue */ struct aiothreadlist { int aiothreadflags; /* AIO proc flags */ TAILQ_ENTRY(aiothreadlist) list; /* List of processes */ struct thread *aiothread; /* The AIO thread */ }; /* * data-structure for lio signal management */ struct aioliojob { int lioj_flags; int lioj_count; int lioj_finished_count; struct sigevent lioj_signal; /* signal on all I/O done */ TAILQ_ENTRY(aioliojob) lioj_list; struct knlist klist; /* list of knotes */ ksiginfo_t lioj_ksi; /* Realtime signal info */ }; #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ #define LIOJ_KEVENT_POSTED 0x4 /* kevent triggered */ /* * per process aio data structure */ struct kaioinfo { int kaio_flags; /* per process kaio flags */ int kaio_maxactive_count; /* maximum number of AIOs */ int kaio_active_count; /* number of currently used AIOs */ int kaio_qallowed_count; /* maxiumu size of AIO queue */ int kaio_count; /* size of AIO queue */ int kaio_ballowed_count; /* maximum number of buffers */ int kaio_buffer_count; /* number of physio buffers */ TAILQ_HEAD(,aiocblist) kaio_all; /* all AIOs in the process */ TAILQ_HEAD(,aiocblist) kaio_done; /* done queue for process */ TAILQ_HEAD(,aioliojob) kaio_liojoblist; /* list of lio jobs */ TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */ TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */ TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */ }; #define KAIO_RUNDOWN 0x1 /* process is being run down */ #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */ static TAILQ_HEAD(,aiothreadlist) aio_freeproc; /* Idle daemons */ static struct sema aio_newproc_sem; static struct mtx aio_job_mtx; static struct mtx aio_sock_mtx; static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */ static struct unrhdr *aiod_unr; static void aio_init_aioinfo(struct proc *p); static void aio_onceonly(void); static int aio_free_entry(struct aiocblist *aiocbe); static void aio_process(struct aiocblist *aiocbe); static int aio_newproc(int *); static int aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lio, int type, int osigev); static void aio_physwakeup(struct buf *bp); static void aio_proc_rundown(void *arg, struct proc *p); static int aio_qphysio(struct proc *p, struct aiocblist *iocb); static void biohelper(void *, int); static void aio_daemon(void *param); static void aio_swake_cb(struct socket *, struct sockbuf *); static int aio_unload(void); static int filt_aioattach(struct knote *kn); static void filt_aiodetach(struct knote *kn); static int filt_aio(struct knote *kn, long hint); static int filt_lioattach(struct knote *kn); static void filt_liodetach(struct knote *kn); static int filt_lio(struct knote *kn, long hint); #define DONE_BUF 1 #define DONE_QUEUE 2 static void aio_bio_done_notify( struct proc *userp, struct aiocblist *aiocbe, int type); static int do_lio_listio(struct thread *td, struct lio_listio_args *uap, int oldsigev); /* * Zones for: * kaio Per process async io info * aiop async io thread data * aiocb async io jobs * aiol list io job pointer - internal to aio_suspend XXX * aiolio list io jobs */ static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone; /* kqueue filters for aio */ static struct filterops aio_filtops = { 0, filt_aioattach, filt_aiodetach, filt_aio }; static struct filterops lio_filtops = { 0, filt_lioattach, filt_liodetach, filt_lio }; static eventhandler_tag exit_tag, exec_tag; TASKQUEUE_DEFINE_THREAD(aiod_bio); /* * Main operations function for use as a kernel module. */ static int aio_modload(struct module *module, int cmd, void *arg) { int error = 0; switch (cmd) { case MOD_LOAD: aio_onceonly(); break; case MOD_UNLOAD: error = aio_unload(); break; case MOD_SHUTDOWN: break; default: error = EINVAL; break; } return (error); } static moduledata_t aio_mod = { "aio", &aio_modload, NULL }; SYSCALL_MODULE_HELPER(aio_return); SYSCALL_MODULE_HELPER(aio_suspend); SYSCALL_MODULE_HELPER(aio_cancel); SYSCALL_MODULE_HELPER(aio_error); SYSCALL_MODULE_HELPER(aio_read); SYSCALL_MODULE_HELPER(aio_write); SYSCALL_MODULE_HELPER(aio_waitcomplete); SYSCALL_MODULE_HELPER(lio_listio); SYSCALL_MODULE_HELPER(oaio_read); SYSCALL_MODULE_HELPER(oaio_write); SYSCALL_MODULE_HELPER(olio_listio); DECLARE_MODULE(aio, aio_mod, SI_SUB_VFS, SI_ORDER_ANY); MODULE_VERSION(aio, 1); /* * Startup initialization */ static void aio_onceonly(void) { /* XXX: should probably just use so->callback */ aio_swake = &aio_swake_cb; exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL, EVENTHANDLER_PRI_ANY); exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown, NULL, EVENTHANDLER_PRI_ANY); kqueue_add_filteropts(EVFILT_AIO, &aio_filtops); kqueue_add_filteropts(EVFILT_LIO, &lio_filtops); TAILQ_INIT(&aio_freeproc); sema_init(&aio_newproc_sem, 0, "aio_new_proc"); mtx_init(&aio_job_mtx, "aio_job", NULL, MTX_DEF); mtx_init(&aio_sock_mtx, "aio_sock", NULL, MTX_DEF); TAILQ_INIT(&aio_jobs); aiod_unr = new_unrhdr(1, INT_MAX, NULL); kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); aiop_zone = uma_zcreate("AIOP", sizeof(struct aiothreadlist), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); aiocb_zone = uma_zcreate("AIOCB", sizeof(struct aiocblist), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); aiod_timeout = AIOD_TIMEOUT_DEFAULT; aiod_lifetime = AIOD_LIFETIME_DEFAULT; jobrefid = 1; async_io_version = _POSIX_VERSION; p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX); p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE); p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0); } /* * Callback for unload of AIO when used as a module. */ static int aio_unload(void) { int error; /* * XXX: no unloads by default, it's too dangerous. * perhaps we could do it if locked out callers and then * did an aio_proc_rundown() on each process. * * jhb: aio_proc_rundown() needs to run on curproc though, * so I don't think that would fly. */ if (!unloadable) return (EOPNOTSUPP); error = kqueue_del_filteropts(EVFILT_AIO); if (error) return error; async_io_version = 0; aio_swake = NULL; taskqueue_free(taskqueue_aiod_bio); delete_unrhdr(aiod_unr); EVENTHANDLER_DEREGISTER(process_exit, exit_tag); EVENTHANDLER_DEREGISTER(process_exec, exec_tag); mtx_destroy(&aio_job_mtx); mtx_destroy(&aio_sock_mtx); sema_destroy(&aio_newproc_sem); p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, -1); p31b_setcfg(CTL_P1003_1B_AIO_MAX, -1); p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, -1); return (0); } /* * Init the per-process aioinfo structure. The aioinfo limits are set * per-process for user limit (resource) management. */ static void aio_init_aioinfo(struct proc *p) { struct kaioinfo *ki; ki = uma_zalloc(kaio_zone, M_WAITOK); ki->kaio_flags = 0; ki->kaio_maxactive_count = max_aio_per_proc; ki->kaio_active_count = 0; ki->kaio_qallowed_count = max_aio_queue_per_proc; ki->kaio_count = 0; ki->kaio_ballowed_count = max_buf_aio; ki->kaio_buffer_count = 0; TAILQ_INIT(&ki->kaio_all); TAILQ_INIT(&ki->kaio_done); TAILQ_INIT(&ki->kaio_jobqueue); TAILQ_INIT(&ki->kaio_bufqueue); TAILQ_INIT(&ki->kaio_liojoblist); TAILQ_INIT(&ki->kaio_sockqueue); PROC_LOCK(p); if (p->p_aioinfo == NULL) { p->p_aioinfo = ki; PROC_UNLOCK(p); } else { PROC_UNLOCK(p); uma_zfree(kaio_zone, ki); } while (num_aio_procs < target_aio_procs) aio_newproc(NULL); } static int aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi) { PROC_LOCK_ASSERT(p, MA_OWNED); if (!KSI_ONQ(ksi)) { ksi->ksi_code = SI_ASYNCIO; ksi->ksi_flags |= KSI_EXT | KSI_INS; return (psignal_event(p, sigev, ksi)); } return (0); } /* * Free a job entry. Wait for completion if it is currently active, but don't * delay forever. If we delay, we return a flag that says that we have to * restart the queue scan. */ static int aio_free_entry(struct aiocblist *aiocbe) { struct kaioinfo *ki; struct aioliojob *lj; struct proc *p; p = aiocbe->userproc; PROC_LOCK_ASSERT(p, MA_OWNED); MPASS(curproc == p); MPASS(aiocbe->jobstate == JOBST_JOBFINISHED); ki = p->p_aioinfo; MPASS(ki != NULL); atomic_subtract_int(&num_queue_count, 1); ki->kaio_count--; MPASS(ki->kaio_count >= 0); lj = aiocbe->lio; if (lj) { lj->lioj_count--; lj->lioj_finished_count--; if (lj->lioj_count == 0) { TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); /* lio is going away, we need to destroy any knotes */ knlist_delete(&lj->klist, curthread, 1); sigqueue_take(&lj->lioj_ksi); uma_zfree(aiolio_zone, lj); } } TAILQ_REMOVE(&ki->kaio_done, aiocbe, plist); TAILQ_REMOVE(&ki->kaio_all, aiocbe, allist); /* aiocbe is going away, we need to destroy any knotes */ knlist_delete(&aiocbe->klist, curthread, 1); sigqueue_take(&aiocbe->ksi); MPASS(aiocbe->bp == NULL); aiocbe->jobstate = JOBST_NULL; /* Wake up anyone who has interest to do cleanup work. */ if (ki->kaio_flags & (KAIO_WAKEUP | KAIO_RUNDOWN)) { ki->kaio_flags &= ~KAIO_WAKEUP; wakeup(&p->p_aioinfo); } PROC_UNLOCK(p); /* * The thread argument here is used to find the owning process * and is also passed to fo_close() which may pass it to various * places such as devsw close() routines. Because of that, we * need a thread pointer from the process owning the job that is * persistent and won't disappear out from under us or move to * another process. * * Currently, all the callers of this function call it to remove * an aiocblist from the current process' job list either via a * syscall or due to the current process calling exit() or * execve(). Thus, we know that p == curproc. We also know that * curthread can't exit since we are curthread. * * Therefore, we use curthread as the thread to pass to * knlist_delete(). This does mean that it is possible for the * thread pointer at close time to differ from the thread pointer * at open time, but this is already true of file descriptors in * a multithreaded process. */ fdrop(aiocbe->fd_file, curthread); crfree(aiocbe->cred); uma_zfree(aiocb_zone, aiocbe); PROC_LOCK(p); return (0); } /* * Rundown the jobs for a given process. */ static void aio_proc_rundown(void *arg, struct proc *p) { struct kaioinfo *ki; struct aioliojob *lj; struct aiocblist *cbe, *cbn; struct file *fp; struct socket *so; KASSERT(curthread->td_proc == p, ("%s: called on non-curproc", __func__)); ki = p->p_aioinfo; if (ki == NULL) return; PROC_LOCK(p); restart: ki->kaio_flags |= KAIO_RUNDOWN; /* * Try to cancel all pending requests. This code simulates * aio_cancel on all pending I/O requests. */ while ((cbe = TAILQ_FIRST(&ki->kaio_sockqueue))) { fp = cbe->fd_file; so = fp->f_data; mtx_lock(&aio_sock_mtx); TAILQ_REMOVE(&so->so_aiojobq, cbe, list); mtx_unlock(&aio_sock_mtx); TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist); TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, cbe, plist); cbe->jobstate = JOBST_JOBQGLOBAL; } TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) { mtx_lock(&aio_job_mtx); if (cbe->jobstate == JOBST_JOBQGLOBAL) { TAILQ_REMOVE(&aio_jobs, cbe, list); mtx_unlock(&aio_job_mtx); cbe->jobstate = JOBST_JOBFINISHED; cbe->uaiocb._aiocb_private.status = -1; cbe->uaiocb._aiocb_private.error = ECANCELED; TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); aio_bio_done_notify(p, cbe, DONE_QUEUE); } else { mtx_unlock(&aio_job_mtx); } } if (TAILQ_FIRST(&ki->kaio_sockqueue)) goto restart; /* Wait for all running I/O to be finished */ if (TAILQ_FIRST(&ki->kaio_bufqueue) || TAILQ_FIRST(&ki->kaio_jobqueue)) { ki->kaio_flags |= KAIO_WAKEUP; msleep(&p->p_aioinfo, &p->p_mtx, PRIBIO, "aioprn", hz); goto restart; } /* Free all completed I/O requests. */ while ((cbe = TAILQ_FIRST(&ki->kaio_done)) != NULL) aio_free_entry(cbe); while ((lj = TAILQ_FIRST(&ki->kaio_liojoblist)) != NULL) { if (lj->lioj_count == 0) { TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); knlist_delete(&lj->klist, curthread, 1); sigqueue_take(&lj->lioj_ksi); uma_zfree(aiolio_zone, lj); } else { panic("LIO job not cleaned up: C:%d, FC:%d\n", lj->lioj_count, lj->lioj_finished_count); } } uma_zfree(kaio_zone, ki); p->p_aioinfo = NULL; PROC_UNLOCK(p); } /* * Select a job to run (called by an AIO daemon). */ static struct aiocblist * aio_selectjob(struct aiothreadlist *aiop) { struct aiocblist *aiocbe; struct kaioinfo *ki; struct proc *userp; mtx_assert(&aio_job_mtx, MA_OWNED); TAILQ_FOREACH(aiocbe, &aio_jobs, list) { userp = aiocbe->userproc; ki = userp->p_aioinfo; if (ki->kaio_active_count < ki->kaio_maxactive_count) { TAILQ_REMOVE(&aio_jobs, aiocbe, list); /* Account for currently active jobs. */ ki->kaio_active_count++; aiocbe->jobstate = JOBST_JOBRUNNING; break; } } return (aiocbe); } /* * The AIO processing activity. This is the code that does the I/O request for * the non-physio version of the operations. The normal vn operations are used, * and this code should work in all instances for every type of file, including * pipes, sockets, fifos, and regular files. * * XXX I don't think these code work well with pipes, sockets and fifo, the * problem is the aiod threads can be blocked if there is not data or no * buffer space, and file was not opened with O_NONBLOCK, all aiod threads * will be blocked if there is couple of such processes. We need a FOF_OFFSET * like flag to override f_flag to tell low level system to do non-blocking * I/O, we can not muck O_NONBLOCK because there is full of race between * userland and aiod threads, although there is a trigger mechanism for socket, * but it also does not work well if userland is misbehaviored. */ static void aio_process(struct aiocblist *aiocbe) { struct ucred *td_savedcred; struct thread *td; struct proc *mycp; struct aiocb *cb; struct file *fp; struct socket *so; struct uio auio; struct iovec aiov; int cnt; int error; int oublock_st, oublock_end; int inblock_st, inblock_end; td = curthread; td_savedcred = td->td_ucred; td->td_ucred = aiocbe->cred; mycp = td->td_proc; cb = &aiocbe->uaiocb; fp = aiocbe->fd_file; aiov.iov_base = (void *)(uintptr_t)cb->aio_buf; aiov.iov_len = cb->aio_nbytes; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = cb->aio_offset; auio.uio_resid = cb->aio_nbytes; cnt = cb->aio_nbytes; auio.uio_segflg = UIO_USERSPACE; auio.uio_td = td; inblock_st = mycp->p_stats->p_ru.ru_inblock; oublock_st = mycp->p_stats->p_ru.ru_oublock; /* * aio_aqueue() acquires a reference to the file that is * released in aio_free_entry(). */ if (cb->aio_lio_opcode == LIO_READ) { auio.uio_rw = UIO_READ; error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td); } else { auio.uio_rw = UIO_WRITE; error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td); } inblock_end = mycp->p_stats->p_ru.ru_inblock; oublock_end = mycp->p_stats->p_ru.ru_oublock; aiocbe->inputcharge = inblock_end - inblock_st; aiocbe->outputcharge = oublock_end - oublock_st; if ((error) && (auio.uio_resid != cnt)) { if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) error = 0; if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) { int sigpipe = 1; if (fp->f_type == DTYPE_SOCKET) { so = fp->f_data; if (so->so_options & SO_NOSIGPIPE) sigpipe = 0; } if (sigpipe) { PROC_LOCK(aiocbe->userproc); psignal(aiocbe->userproc, SIGPIPE); PROC_UNLOCK(aiocbe->userproc); } } } cnt -= auio.uio_resid; cb->_aiocb_private.error = error; cb->_aiocb_private.status = cnt; td->td_ucred = td_savedcred; } static void aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type) { struct aioliojob *lj; struct kaioinfo *ki; int lj_done; PROC_LOCK_ASSERT(userp, MA_OWNED); ki = userp->p_aioinfo; lj = aiocbe->lio; lj_done = 0; if (lj) { lj->lioj_finished_count++; if (lj->lioj_count == lj->lioj_finished_count) lj_done = 1; } if (type == DONE_QUEUE) { aiocbe->jobflags |= AIOCBLIST_DONE; } else { aiocbe->jobflags |= AIOCBLIST_BUFDONE; ki->kaio_buffer_count--; } TAILQ_INSERT_TAIL(&ki->kaio_done, aiocbe, plist); aiocbe->jobstate = JOBST_JOBFINISHED; if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL || aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) aio_sendsig(userp, &aiocbe->uaiocb.aio_sigevent, &aiocbe->ksi); KNOTE_LOCKED(&aiocbe->klist, 1); if (lj_done) { if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { lj->lioj_flags |= LIOJ_KEVENT_POSTED; KNOTE_LOCKED(&lj->klist, 1); } if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) { aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi); lj->lioj_flags |= LIOJ_SIGNAL_POSTED; } } if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) { ki->kaio_flags &= ~KAIO_WAKEUP; wakeup(&userp->p_aioinfo); } } /* * The AIO daemon, most of the actual work is done in aio_process, * but the setup (and address space mgmt) is done in this routine. */ static void aio_daemon(void *_id) { struct aiocblist *aiocbe; struct aiothreadlist *aiop; struct kaioinfo *ki; struct proc *curcp, *mycp, *userp; struct vmspace *myvm, *tmpvm; struct thread *td = curthread; struct pgrp *newpgrp; struct session *newsess; int id = (intptr_t)_id; /* * Local copies of curproc (cp) and vmspace (myvm) */ mycp = td->td_proc; myvm = mycp->p_vmspace; KASSERT(mycp->p_textvp == NULL, ("kthread has a textvp")); /* * Allocate and ready the aio control info. There is one aiop structure * per daemon. */ aiop = uma_zalloc(aiop_zone, M_WAITOK); aiop->aiothread = td; aiop->aiothreadflags |= AIOP_FREE; /* * Place thread (lightweight process) onto the AIO free thread list. */ mtx_lock(&aio_job_mtx); TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); mtx_unlock(&aio_job_mtx); /* * Get rid of our current filedescriptors. AIOD's don't need any * filedescriptors, except as temporarily inherited from the client. */ fdfree(td); /* The daemon resides in its own pgrp. */ MALLOC(newpgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP, M_WAITOK | M_ZERO); MALLOC(newsess, struct session *, sizeof(struct session), M_SESSION, M_WAITOK | M_ZERO); sx_xlock(&proctree_lock); enterpgrp(mycp, mycp->p_pid, newpgrp, newsess); sx_xunlock(&proctree_lock); /* * Wakeup parent process. (Parent sleeps to keep from blasting away * and creating too many daemons.) */ sema_post(&aio_newproc_sem); mtx_lock(&aio_job_mtx); for (;;) { /* * curcp is the current daemon process context. * userp is the current user process context. */ curcp = mycp; /* * Take daemon off of free queue */ if (aiop->aiothreadflags & AIOP_FREE) { TAILQ_REMOVE(&aio_freeproc, aiop, list); aiop->aiothreadflags &= ~AIOP_FREE; } /* * Check for jobs. */ while ((aiocbe = aio_selectjob(aiop)) != NULL) { mtx_unlock(&aio_job_mtx); userp = aiocbe->userproc; /* * Connect to process address space for user program. */ if (userp != curcp) { /* * Save the current address space that we are * connected to. */ tmpvm = mycp->p_vmspace; /* * Point to the new user address space, and * refer to it. */ mycp->p_vmspace = userp->p_vmspace; atomic_add_int(&mycp->p_vmspace->vm_refcnt, 1); /* Activate the new mapping. */ pmap_activate(FIRST_THREAD_IN_PROC(mycp)); /* * If the old address space wasn't the daemons * own address space, then we need to remove the * daemon's reference from the other process * that it was acting on behalf of. */ if (tmpvm != myvm) { vmspace_free(tmpvm); } curcp = userp; } ki = userp->p_aioinfo; /* Do the I/O function. */ aio_process(aiocbe); mtx_lock(&aio_job_mtx); /* Decrement the active job count. */ ki->kaio_active_count--; mtx_unlock(&aio_job_mtx); PROC_LOCK(userp); TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); aio_bio_done_notify(userp, aiocbe, DONE_QUEUE); if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) { wakeup(aiocbe); aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN; } PROC_UNLOCK(userp); mtx_lock(&aio_job_mtx); } /* * Disconnect from user address space. */ if (curcp != mycp) { mtx_unlock(&aio_job_mtx); /* Get the user address space to disconnect from. */ tmpvm = mycp->p_vmspace; /* Get original address space for daemon. */ mycp->p_vmspace = myvm; /* Activate the daemon's address space. */ pmap_activate(FIRST_THREAD_IN_PROC(mycp)); #ifdef DIAGNOSTIC if (tmpvm == myvm) { printf("AIOD: vmspace problem -- %d\n", mycp->p_pid); } #endif /* Remove our vmspace reference. */ vmspace_free(tmpvm); curcp = mycp; mtx_lock(&aio_job_mtx); /* * We have to restart to avoid race, we only sleep if * no job can be selected, that should be * curcp == mycp. */ continue; } mtx_assert(&aio_job_mtx, MA_OWNED); TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); aiop->aiothreadflags |= AIOP_FREE; /* * If daemon is inactive for a long time, allow it to exit, * thereby freeing resources. */ if (msleep(aiop->aiothread, &aio_job_mtx, PRIBIO, "aiordy", aiod_lifetime)) { if (TAILQ_EMPTY(&aio_jobs)) { if ((aiop->aiothreadflags & AIOP_FREE) && (num_aio_procs > target_aio_procs)) { TAILQ_REMOVE(&aio_freeproc, aiop, list); num_aio_procs--; mtx_unlock(&aio_job_mtx); uma_zfree(aiop_zone, aiop); free_unr(aiod_unr, id); #ifdef DIAGNOSTIC if (mycp->p_vmspace->vm_refcnt <= 1) { printf("AIOD: bad vm refcnt for" " exiting daemon: %d\n", mycp->p_vmspace->vm_refcnt); } #endif kthread_exit(0); } } } } mtx_unlock(&aio_job_mtx); panic("shouldn't be here\n"); } /* * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The * AIO daemon modifies its environment itself. */ static int aio_newproc(int *start) { int error; struct proc *p; int id; id = alloc_unr(aiod_unr); error = kthread_create(aio_daemon, (void *)(intptr_t)id, &p, RFNOWAIT, 0, "aiod%d", id); if (error == 0) { /* * Wait until daemon is started. */ sema_wait(&aio_newproc_sem); mtx_lock(&aio_job_mtx); num_aio_procs++; if (start != NULL) *start--; mtx_unlock(&aio_job_mtx); } else { free_unr(aiod_unr, id); } return (error); } /* * Try the high-performance, low-overhead physio method for eligible * VCHR devices. This method doesn't use an aio helper thread, and * thus has very low overhead. * * Assumes that the caller, aio_aqueue(), has incremented the file * structure's reference count, preventing its deallocation for the * duration of this call. */ static int aio_qphysio(struct proc *p, struct aiocblist *aiocbe) { struct aiocb *cb; struct file *fp; struct buf *bp; struct vnode *vp; struct kaioinfo *ki; struct aioliojob *lj; int error; cb = &aiocbe->uaiocb; fp = aiocbe->fd_file; if (fp->f_type != DTYPE_VNODE) return (-1); vp = fp->f_vnode; /* * If its not a disk, we don't want to return a positive error. * It causes the aio code to not fall through to try the thread * way when you're talking to a regular file. */ if (!vn_isdisk(vp, &error)) { if (error == ENOTBLK) return (-1); else return (error); } if (cb->aio_nbytes % vp->v_bufobj.bo_bsize) return (-1); if (cb->aio_nbytes > vp->v_rdev->si_iosize_max) return (-1); if (cb->aio_nbytes > MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK)) return (-1); ki = p->p_aioinfo; if (ki->kaio_buffer_count >= ki->kaio_ballowed_count) return (-1); /* Create and build a buffer header for a transfer. */ bp = (struct buf *)getpbuf(NULL); BUF_KERNPROC(bp); PROC_LOCK(p); ki->kaio_count++; ki->kaio_buffer_count++; lj = aiocbe->lio; if (lj) lj->lioj_count++; PROC_UNLOCK(p); /* * Get a copy of the kva from the physical buffer. */ error = 0; bp->b_bcount = cb->aio_nbytes; bp->b_bufsize = cb->aio_nbytes; bp->b_iodone = aio_physwakeup; bp->b_saveaddr = bp->b_data; bp->b_data = (void *)(uintptr_t)cb->aio_buf; bp->b_offset = cb->aio_offset; bp->b_iooffset = cb->aio_offset; bp->b_blkno = btodb(cb->aio_offset); bp->b_iocmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ; /* * Bring buffer into kernel space. */ if (vmapbuf(bp) < 0) { error = EFAULT; goto doerror; } PROC_LOCK(p); aiocbe->bp = bp; bp->b_caller1 = (void *)aiocbe; TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist); TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist); aiocbe->jobstate = JOBST_JOBQBUF; cb->_aiocb_private.status = cb->aio_nbytes; PROC_UNLOCK(p); atomic_add_int(&num_queue_count, 1); atomic_add_int(&num_buf_aio, 1); bp->b_error = 0; TASK_INIT(&aiocbe->biotask, 0, biohelper, aiocbe); /* Perform transfer. */ dev_strategy(vp->v_rdev, bp); return (0); doerror: PROC_LOCK(p); ki->kaio_count--; ki->kaio_buffer_count--; if (lj) lj->lioj_count--; aiocbe->bp = NULL; PROC_UNLOCK(p); relpbuf(bp, NULL); return (error); } /* * Wake up aio requests that may be serviceable now. */ static void aio_swake_cb(struct socket *so, struct sockbuf *sb) { struct aiocblist *cb, *cbn; struct proc *p; struct kaioinfo *ki = NULL; int opcode, wakecount = 0; struct aiothreadlist *aiop; if (sb == &so->so_snd) { opcode = LIO_WRITE; SOCKBUF_LOCK(&so->so_snd); so->so_snd.sb_flags &= ~SB_AIO; SOCKBUF_UNLOCK(&so->so_snd); } else { opcode = LIO_READ; SOCKBUF_LOCK(&so->so_rcv); so->so_rcv.sb_flags &= ~SB_AIO; SOCKBUF_UNLOCK(&so->so_rcv); } mtx_lock(&aio_sock_mtx); TAILQ_FOREACH_SAFE(cb, &so->so_aiojobq, list, cbn) { if (opcode == cb->uaiocb.aio_lio_opcode) { if (cb->jobstate != JOBST_JOBQSOCK) panic("invalid queue value"); p = cb->userproc; ki = p->p_aioinfo; TAILQ_REMOVE(&so->so_aiojobq, cb, list); PROC_LOCK(p); TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist); /* * XXX check AIO_RUNDOWN, and don't put on * jobqueue if it was set. */ TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist); cb->jobstate = JOBST_JOBQGLOBAL; mtx_lock(&aio_job_mtx); TAILQ_INSERT_TAIL(&aio_jobs, cb, list); mtx_unlock(&aio_job_mtx); PROC_UNLOCK(p); wakecount++; } } mtx_unlock(&aio_sock_mtx); while (wakecount--) { mtx_lock(&aio_job_mtx); if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { TAILQ_REMOVE(&aio_freeproc, aiop, list); aiop->aiothreadflags &= ~AIOP_FREE; wakeup(aiop->aiothread); } mtx_unlock(&aio_job_mtx); } } /* * Queue a new AIO request. Choosing either the threaded or direct physio VCHR * technique is done in this code. */ static int aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj, int type, int oldsigev) { struct proc *p = td->td_proc; struct file *fp; struct socket *so; struct aiocblist *aiocbe; struct aiothreadlist *aiop; struct kaioinfo *ki; struct kevent kev; struct kqueue *kq; struct file *kq_fp; struct sockbuf *sb; int opcode; int error; int fd; int jid; if (p->p_aioinfo == NULL) aio_init_aioinfo(p); ki = p->p_aioinfo; suword(&job->_aiocb_private.status, -1); suword(&job->_aiocb_private.error, 0); suword(&job->_aiocb_private.kernelinfo, -1); if (num_queue_count >= max_queue_count || ki->kaio_count >= ki->kaio_qallowed_count) { suword(&job->_aiocb_private.error, EAGAIN); return (EAGAIN); } aiocbe = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO); aiocbe->inputcharge = 0; aiocbe->outputcharge = 0; knlist_init(&aiocbe->klist, &p->p_mtx, NULL, NULL, NULL); if (oldsigev) { bzero(&aiocbe->uaiocb, sizeof(struct aiocb)); error = copyin(job, &aiocbe->uaiocb, sizeof(struct oaiocb)); bcopy(&aiocbe->uaiocb.__spare__, &aiocbe->uaiocb.aio_sigevent, sizeof(struct osigevent)); } else { error = copyin(job, &aiocbe->uaiocb, sizeof(struct aiocb)); } if (error) { suword(&job->_aiocb_private.error, error); uma_zfree(aiocb_zone, aiocbe); return (error); } if (aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT && aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL && aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID && aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) { suword(&job->_aiocb_private.error, EINVAL); uma_zfree(aiocb_zone, aiocbe); return (EINVAL); } if ((aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL || aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) && !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) { uma_zfree(aiocb_zone, aiocbe); return (EINVAL); } ksiginfo_init(&aiocbe->ksi); /* Save userspace address of the job info. */ aiocbe->uuaiocb = job; /* Get the opcode. */ if (type != LIO_NOP) aiocbe->uaiocb.aio_lio_opcode = type; opcode = aiocbe->uaiocb.aio_lio_opcode; /* Fetch the file object for the specified file descriptor. */ fd = aiocbe->uaiocb.aio_fildes; switch (opcode) { case LIO_WRITE: error = fget_write(td, fd, &fp); break; case LIO_READ: error = fget_read(td, fd, &fp); break; default: error = fget(td, fd, &fp); } if (error) { uma_zfree(aiocb_zone, aiocbe); suword(&job->_aiocb_private.error, EBADF); return (error); } aiocbe->fd_file = fp; if (aiocbe->uaiocb.aio_offset == -1LL) { error = EINVAL; goto aqueue_fail; } mtx_lock(&aio_job_mtx); jid = jobrefid; if (jobrefid == LONG_MAX) jobrefid = 1; else jobrefid++; mtx_unlock(&aio_job_mtx); error = suword(&job->_aiocb_private.kernelinfo, jid); if (error) { error = EINVAL; goto aqueue_fail; } aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid; if (opcode == LIO_NOP) { fdrop(fp, td); uma_zfree(aiocb_zone, aiocbe); return (0); } if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) { error = EINVAL; goto aqueue_fail; } if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) { kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue; } else goto no_kqueue; error = fget(td, (u_int)kev.ident, &kq_fp); if (error) goto aqueue_fail; if (kq_fp->f_type != DTYPE_KQUEUE) { fdrop(kq_fp, td); error = EBADF; goto aqueue_fail; } kq = kq_fp->f_data; kev.ident = (uintptr_t)aiocbe->uuaiocb; kev.filter = EVFILT_AIO; kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; kev.data = (intptr_t)aiocbe; kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sival_ptr; error = kqueue_register(kq, &kev, td, 1); fdrop(kq_fp, td); aqueue_fail: if (error) { fdrop(fp, td); uma_zfree(aiocb_zone, aiocbe); suword(&job->_aiocb_private.error, error); goto done; } no_kqueue: suword(&job->_aiocb_private.error, EINPROGRESS); aiocbe->uaiocb._aiocb_private.error = EINPROGRESS; aiocbe->userproc = p; aiocbe->cred = crhold(td->td_ucred); aiocbe->jobflags = 0; aiocbe->lio = lj; if (fp->f_type == DTYPE_SOCKET) { /* * Alternate queueing for socket ops: Reach down into the * descriptor to get the socket data. Then check to see if the * socket is ready to be read or written (based on the requested * operation). * * If it is not ready for io, then queue the aiocbe on the * socket, and set the flags so we get a call when sbnotify() * happens. * * Note if opcode is neither LIO_WRITE nor LIO_READ we lock * and unlock the snd sockbuf for no reason. */ so = fp->f_data; sb = (opcode == LIO_READ) ? &so->so_rcv : &so->so_snd; SOCKBUF_LOCK(sb); if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode == LIO_WRITE) && (!sowriteable(so)))) { mtx_lock(&aio_sock_mtx); TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list); mtx_unlock(&aio_sock_mtx); sb->sb_flags |= SB_AIO; PROC_LOCK(p); TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist); TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist); aiocbe->jobstate = JOBST_JOBQSOCK; ki->kaio_count++; if (lj) lj->lioj_count++; PROC_UNLOCK(p); SOCKBUF_UNLOCK(sb); atomic_add_int(&num_queue_count, 1); error = 0; goto done; } SOCKBUF_UNLOCK(sb); } if ((error = aio_qphysio(p, aiocbe)) == 0) goto done; #if 0 if (error > 0) { aiocbe->uaiocb._aiocb_private.error = error; suword(&job->_aiocb_private.error, error); goto done; } #endif /* No buffer for daemon I/O. */ aiocbe->bp = NULL; PROC_LOCK(p); ki->kaio_count++; if (lj) lj->lioj_count++; TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist); mtx_lock(&aio_job_mtx); TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list); aiocbe->jobstate = JOBST_JOBQGLOBAL; PROC_UNLOCK(p); atomic_add_int(&num_queue_count, 1); /* * If we don't have a free AIO process, and we are below our quota, then * start one. Otherwise, depend on the subsequent I/O completions to * pick-up this job. If we don't sucessfully create the new process * (thread) due to resource issues, we return an error for now (EAGAIN), * which is likely not the correct thing to do. */ retryproc: error = 0; if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { TAILQ_REMOVE(&aio_freeproc, aiop, list); aiop->aiothreadflags &= ~AIOP_FREE; wakeup(aiop->aiothread); } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) && ((ki->kaio_active_count + num_aio_resv_start) < ki->kaio_maxactive_count)) { num_aio_resv_start++; mtx_unlock(&aio_job_mtx); error = aio_newproc(&num_aio_resv_start); mtx_lock(&aio_job_mtx); if (error) { num_aio_resv_start--; goto retryproc; } } mtx_unlock(&aio_job_mtx); done: return (error); } /* * Support the aio_return system call, as a side-effect, kernel resources are * released. */ int aio_return(struct thread *td, struct aio_return_args *uap) { struct proc *p = td->td_proc; struct aiocblist *cb; struct aiocb *uaiocb; struct kaioinfo *ki; int status, error; ki = p->p_aioinfo; if (ki == NULL) return (EINVAL); uaiocb = uap->aiocbp; PROC_LOCK(p); TAILQ_FOREACH(cb, &ki->kaio_done, plist) { if (cb->uuaiocb == uaiocb) break; } if (cb != NULL) { MPASS(cb->jobstate == JOBST_JOBFINISHED); status = cb->uaiocb._aiocb_private.status; error = cb->uaiocb._aiocb_private.error; td->td_retval[0] = status; if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { p->p_stats->p_ru.ru_oublock += cb->outputcharge; cb->outputcharge = 0; } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { p->p_stats->p_ru.ru_inblock += cb->inputcharge; cb->inputcharge = 0; } aio_free_entry(cb); suword(&uaiocb->_aiocb_private.error, error); suword(&uaiocb->_aiocb_private.status, status); error = 0; } else error = EINVAL; PROC_UNLOCK(p); return (error); } /* * Allow a process to wakeup when any of the I/O requests are completed. */ int aio_suspend(struct thread *td, struct aio_suspend_args *uap) { struct proc *p = td->td_proc; struct timeval atv; struct timespec ts; struct aiocb *const *cbptr, *cbp; struct kaioinfo *ki; struct aiocblist *cb, *cbfirst; struct aiocb **ujoblist; int njoblist; int error; int timo; int i; if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX) return (EINVAL); timo = 0; if (uap->timeout) { /* Get timespec struct. */ if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) return (error); if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) return (EINVAL); TIMESPEC_TO_TIMEVAL(&atv, &ts); if (itimerfix(&atv)) return (EINVAL); timo = tvtohz(&atv); } ki = p->p_aioinfo; if (ki == NULL) return (EAGAIN); njoblist = 0; ujoblist = uma_zalloc(aiol_zone, M_WAITOK); cbptr = uap->aiocbp; for (i = 0; i < uap->nent; i++) { cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); if (cbp == 0) continue; ujoblist[njoblist] = cbp; njoblist++; } if (njoblist == 0) { uma_zfree(aiol_zone, ujoblist); return (0); } PROC_LOCK(p); for (;;) { cbfirst = NULL; error = 0; TAILQ_FOREACH(cb, &ki->kaio_all, allist) { for (i = 0; i < njoblist; i++) { if (cb->uuaiocb == ujoblist[i]) { if (cbfirst == NULL) cbfirst = cb; if (cb->jobstate == JOBST_JOBFINISHED) goto RETURN; } } } /* All tasks were finished. */ if (cbfirst == NULL) break; ki->kaio_flags |= KAIO_WAKEUP; error = msleep(&p->p_aioinfo, &p->p_mtx, PRIBIO | PCATCH, "aiospn", timo); if (error == ERESTART) error = EINTR; if (error) break; } RETURN: PROC_UNLOCK(p); uma_zfree(aiol_zone, ujoblist); return (error); } /* * aio_cancel cancels any non-physio aio operations not currently in * progress. */ int aio_cancel(struct thread *td, struct aio_cancel_args *uap) { struct proc *p = td->td_proc; struct kaioinfo *ki; struct aiocblist *cbe, *cbn; struct file *fp; struct socket *so; int error; int cancelled = 0; int notcancelled = 0; struct vnode *vp; /* Lookup file object. */ error = fget(td, uap->fd, &fp); if (error) return (error); ki = p->p_aioinfo; if (ki == NULL) goto done; if (fp->f_type == DTYPE_VNODE) { vp = fp->f_vnode; if (vn_isdisk(vp, &error)) { fdrop(fp, td); td->td_retval[0] = AIO_NOTCANCELED; return (0); } } else if (fp->f_type == DTYPE_SOCKET) { so = fp->f_data; mtx_lock(&aio_sock_mtx); TAILQ_FOREACH_SAFE(cbe, &so->so_aiojobq, list, cbn) { if (cbe->userproc == p && (uap->aiocbp == NULL || uap->aiocbp == cbe->uuaiocb)) { TAILQ_REMOVE(&so->so_aiojobq, cbe, list); PROC_LOCK(p); TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist); cbe->jobstate = JOBST_JOBRUNNING; cbe->uaiocb._aiocb_private.status = -1; cbe->uaiocb._aiocb_private.error = ECANCELED; aio_bio_done_notify(p, cbe, DONE_QUEUE); PROC_UNLOCK(p); cancelled++; if (uap->aiocbp != NULL) break; } } mtx_unlock(&aio_sock_mtx); if (cancelled && uap->aiocbp != NULL) { fdrop(fp, td); td->td_retval[0] = AIO_CANCELED; return (0); } } PROC_LOCK(p); TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) { if ((uap->fd == cbe->uaiocb.aio_fildes) && ((uap->aiocbp == NULL) || (uap->aiocbp == cbe->uuaiocb))) { mtx_lock(&aio_job_mtx); if (cbe->jobstate == JOBST_JOBQGLOBAL) { TAILQ_REMOVE(&aio_jobs, cbe, list); mtx_unlock(&aio_job_mtx); TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); cbe->uaiocb._aiocb_private.status = -1; cbe->uaiocb._aiocb_private.error = ECANCELED; aio_bio_done_notify(p, cbe, DONE_QUEUE); cancelled++; } else { mtx_unlock(&aio_job_mtx); notcancelled++; } } } PROC_UNLOCK(p); done: fdrop(fp, td); if (notcancelled) { td->td_retval[0] = AIO_NOTCANCELED; return (0); } if (cancelled) { td->td_retval[0] = AIO_CANCELED; return (0); } td->td_retval[0] = AIO_ALLDONE; return (0); } /* * aio_error is implemented in the kernel level for compatibility purposes only. * For a user mode async implementation, it would be best to do it in a userland * subroutine. */ int aio_error(struct thread *td, struct aio_error_args *uap) { struct proc *p = td->td_proc; struct aiocblist *cb; struct kaioinfo *ki; int status; ki = p->p_aioinfo; if (ki == NULL) { td->td_retval[0] = EINVAL; return (0); } PROC_LOCK(p); TAILQ_FOREACH(cb, &ki->kaio_all, allist) { if (cb->uuaiocb == uap->aiocbp) { if (cb->jobstate == JOBST_JOBFINISHED) td->td_retval[0] = cb->uaiocb._aiocb_private.error; else td->td_retval[0] = EINPROGRESS; PROC_UNLOCK(p); return (0); } } PROC_UNLOCK(p); /* * Hack for failure of aio_aqueue. */ status = fuword(&uap->aiocbp->_aiocb_private.status); if (status == -1) { td->td_retval[0] = fuword(&uap->aiocbp->_aiocb_private.error); return (0); } td->td_retval[0] = EINVAL; return (0); } /* syscall - asynchronous read from a file (REALTIME) */ int oaio_read(struct thread *td, struct oaio_read_args *uap) { return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 1); } int aio_read(struct thread *td, struct aio_read_args *uap) { return aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, 0); } /* syscall - asynchronous write to a file (REALTIME) */ int oaio_write(struct thread *td, struct oaio_write_args *uap) { return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 1); } int aio_write(struct thread *td, struct aio_write_args *uap) { return aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, 0); } /* syscall - list directed I/O (REALTIME) */ int olio_listio(struct thread *td, struct olio_listio_args *uap) { return do_lio_listio(td, (struct lio_listio_args *)uap, 1); } /* syscall - list directed I/O (REALTIME) */ int lio_listio(struct thread *td, struct lio_listio_args *uap) { return do_lio_listio(td, uap, 0); } static int do_lio_listio(struct thread *td, struct lio_listio_args *uap, int oldsigev) { struct proc *p = td->td_proc; struct aiocb *iocb, * const *cbptr; struct kaioinfo *ki; struct aioliojob *lj; struct kevent kev; struct kqueue * kq; struct file *kq_fp; int nent; int error; int nerror; int i; if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) return (EINVAL); nent = uap->nent; if (nent < 0 || nent > AIO_LISTIO_MAX) return (EINVAL); if (p->p_aioinfo == NULL) aio_init_aioinfo(p); ki = p->p_aioinfo; lj = uma_zalloc(aiolio_zone, M_WAITOK); lj->lioj_flags = 0; lj->lioj_count = 0; lj->lioj_finished_count = 0; knlist_init(&lj->klist, &p->p_mtx, NULL, NULL, NULL); ksiginfo_init(&lj->lioj_ksi); /* * Setup signal. */ if (uap->sig && (uap->mode == LIO_NOWAIT)) { bzero(&lj->lioj_signal, sizeof(&lj->lioj_signal)); error = copyin(uap->sig, &lj->lioj_signal, oldsigev ? sizeof(struct osigevent) : sizeof(struct sigevent)); if (error) { uma_zfree(aiolio_zone, lj); return (error); } if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { /* Assume only new style KEVENT */ error = fget(td, lj->lioj_signal.sigev_notify_kqueue, &kq_fp); if (error) { uma_zfree(aiolio_zone, lj); return (error); } if (kq_fp->f_type != DTYPE_KQUEUE) { fdrop(kq_fp, td); uma_zfree(aiolio_zone, lj); return (EBADF); } kq = (struct kqueue *)kq_fp->f_data; kev.filter = EVFILT_LIO; kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; kev.ident = (uintptr_t)lj; /* something unique */ kev.data = (intptr_t)lj; /* pass user defined sigval data */ kev.udata = lj->lioj_signal.sigev_value.sival_ptr; error = kqueue_register(kq, &kev, td, 1); fdrop(kq_fp, td); if (error) { uma_zfree(aiolio_zone, lj); return (error); } } else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) { ; } else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) { if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { uma_zfree(aiolio_zone, lj); return EINVAL; } lj->lioj_flags |= LIOJ_SIGNAL; } else { uma_zfree(aiolio_zone, lj); return EINVAL; } } PROC_LOCK(p); TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); /* * Add extra aiocb count to avoid the lio to be freed * by other threads doing aio_waitcomplete or aio_return, * and prevent event from being sent until we have queued * all tasks. */ lj->lioj_count = 1; PROC_UNLOCK(p); /* * Get pointers to the list of I/O requests. */ nerror = 0; cbptr = uap->acb_list; for (i = 0; i < uap->nent; i++) { iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) { error = aio_aqueue(td, iocb, lj, 0, oldsigev); if (error != 0) nerror++; } } error = 0; PROC_LOCK(p); if (uap->mode == LIO_WAIT) { while (lj->lioj_count - 1 != lj->lioj_finished_count) { ki->kaio_flags |= KAIO_WAKEUP; error = msleep(&p->p_aioinfo, &p->p_mtx, PRIBIO | PCATCH, "aiospn", 0); if (error == ERESTART) error = EINTR; if (error) break; } } else { if (lj->lioj_count - 1 == lj->lioj_finished_count) { if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) { lj->lioj_flags |= LIOJ_KEVENT_POSTED; KNOTE_LOCKED(&lj->klist, 1); } if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL || lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) { aio_sendsig(p, &lj->lioj_signal, &lj->lioj_ksi); lj->lioj_flags |= LIOJ_SIGNAL_POSTED; } } } lj->lioj_count--; if (lj->lioj_count == 0) { TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); knlist_delete(&lj->klist, curthread, 1); sigqueue_take(&lj->lioj_ksi); PROC_UNLOCK(p); uma_zfree(aiolio_zone, lj); } else PROC_UNLOCK(p); if (nerror) return (EIO); return (error); } /* * Called from interrupt thread for physio, we should return as fast * as possible, so we schedule a biohelper task. */ static void aio_physwakeup(struct buf *bp) { struct aiocblist *aiocbe; aiocbe = (struct aiocblist *)bp->b_caller1; taskqueue_enqueue(taskqueue_aiod_bio, &aiocbe->biotask); } /* * Task routine to perform heavy tasks, process wakeup, and signals. */ static void biohelper(void *context, int pending) { struct aiocblist *aiocbe = context; struct buf *bp; struct proc *userp; int nblks; bp = aiocbe->bp; userp = aiocbe->userproc; PROC_LOCK(userp); aiocbe->uaiocb._aiocb_private.status -= bp->b_resid; aiocbe->uaiocb._aiocb_private.error = 0; if (bp->b_ioflags & BIO_ERROR) aiocbe->uaiocb._aiocb_private.error = bp->b_error; nblks = btodb(aiocbe->uaiocb.aio_nbytes); if (aiocbe->uaiocb.aio_lio_opcode == LIO_WRITE) aiocbe->outputcharge += nblks; else aiocbe->inputcharge += nblks; aiocbe->bp = NULL; TAILQ_REMOVE(&userp->p_aioinfo->kaio_bufqueue, aiocbe, plist); aio_bio_done_notify(userp, aiocbe, DONE_BUF); PROC_UNLOCK(userp); /* Release mapping into kernel space. */ vunmapbuf(bp); relpbuf(bp, NULL); atomic_subtract_int(&num_buf_aio, 1); } /* syscall - wait for the next completion of an aio request */ int aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap) { struct proc *p = td->td_proc; struct timeval atv; struct timespec ts; struct kaioinfo *ki; struct aiocblist *cb; struct aiocb *uuaiocb; int error, status, timo; suword(uap->aiocbp, (long)NULL); timo = 0; if (uap->timeout) { /* Get timespec struct. */ error = copyin(uap->timeout, &ts, sizeof(ts)); if (error) return (error); if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000)) return (EINVAL); TIMESPEC_TO_TIMEVAL(&atv, &ts); if (itimerfix(&atv)) return (EINVAL); timo = tvtohz(&atv); } if (p->p_aioinfo == NULL) aio_init_aioinfo(p); ki = p->p_aioinfo; error = 0; cb = NULL; PROC_LOCK(p); while ((cb = TAILQ_FIRST(&ki->kaio_done)) == NULL) { ki->kaio_flags |= KAIO_WAKEUP; error = msleep(&p->p_aioinfo, &p->p_mtx, PRIBIO | PCATCH, "aiowc", timo); if (error == ERESTART) error = EINTR; if (error) break; } if (cb != NULL) { MPASS(cb->jobstate == JOBST_JOBFINISHED); uuaiocb = cb->uuaiocb; status = cb->uaiocb._aiocb_private.status; error = cb->uaiocb._aiocb_private.error; td->td_retval[0] = status; if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { p->p_stats->p_ru.ru_oublock += cb->outputcharge; cb->outputcharge = 0; } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { p->p_stats->p_ru.ru_inblock += cb->inputcharge; cb->inputcharge = 0; } aio_free_entry(cb); PROC_UNLOCK(p); suword(uap->aiocbp, (long)uuaiocb); suword(&uuaiocb->_aiocb_private.error, error); suword(&uuaiocb->_aiocb_private.status, status); } else PROC_UNLOCK(p); return (error); } /* kqueue attach function */ static int filt_aioattach(struct knote *kn) { struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; /* * The aiocbe pointer must be validated before using it, so * registration is restricted to the kernel; the user cannot * set EV_FLAG1. */ if ((kn->kn_flags & EV_FLAG1) == 0) return (EPERM); kn->kn_flags &= ~EV_FLAG1; knlist_add(&aiocbe->klist, kn, 0); return (0); } /* kqueue detach function */ static void filt_aiodetach(struct knote *kn) { struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; if (!knlist_empty(&aiocbe->klist)) knlist_remove(&aiocbe->klist, kn, 0); } /* kqueue filter function */ /*ARGSUSED*/ static int filt_aio(struct knote *kn, long hint) { struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; kn->kn_data = aiocbe->uaiocb._aiocb_private.error; if (aiocbe->jobstate != JOBST_JOBFINISHED) return (0); kn->kn_flags |= EV_EOF; return (1); } /* kqueue attach function */ static int filt_lioattach(struct knote *kn) { struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata; /* * The aioliojob pointer must be validated before using it, so * registration is restricted to the kernel; the user cannot * set EV_FLAG1. */ if ((kn->kn_flags & EV_FLAG1) == 0) return (EPERM); kn->kn_flags &= ~EV_FLAG1; knlist_add(&lj->klist, kn, 0); return (0); } /* kqueue detach function */ static void filt_liodetach(struct knote *kn) { struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata; if (!knlist_empty(&lj->klist)) knlist_remove(&lj->klist, kn, 0); } /* kqueue filter function */ /*ARGSUSED*/ static int filt_lio(struct knote *kn, long hint) { struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata; return (lj->lioj_flags & LIOJ_KEVENT_POSTED); }