/* * 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. * * $Id: vfs_aio.c,v 1.55 1999/08/08 18:42:48 phk Exp $ */ /* * This file contains support for the POSIX 1003.1B AIO/LIO facility. */ #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 static long jobrefid; #define JOBST_NULL 0x0 #define JOBST_JOBQPROC 0x1 #define JOBST_JOBQGLOBAL 0x2 #define JOBST_JOBRUNNING 0x3 #define JOBST_JOBFINISHED 0x4 #define JOBST_JOBQBUF 0x5 #define JOBST_JOBBFINISHED 0x6 #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 0 #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 int max_aio_procs = MAX_AIO_PROCS; static int num_aio_procs = 0; static int target_aio_procs = TARGET_AIO_PROCS; static int max_queue_count = MAX_AIO_QUEUE; static int num_queue_count = 0; static int num_buf_aio = 0; static int num_aio_resv_start = 0; static int aiod_timeout; static int aiod_lifetime; static int max_aio_per_proc = MAX_AIO_PER_PROC, max_aio_queue_per_proc=MAX_AIO_QUEUE_PER_PROC; static int max_buf_aio = MAX_BUF_AIO; SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "AIO mgmt"); SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 0, ""); SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, &max_aio_queue_per_proc, 0, ""); SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, CTLFLAG_RW, &max_aio_procs, 0, ""); SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, CTLFLAG_RD, &num_aio_procs, 0, ""); SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, ""); SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, ""); SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 0, ""); SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, ""); SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, ""); SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, ""); SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0, ""); /* * Job queue item */ #define AIOCBLIST_CANCELLED 0x1 #define AIOCBLIST_RUNDOWN 0x4 #define AIOCBLIST_ASYNCFREE 0x8 #define AIOCBLIST_DONE 0x10 struct aiocblist { TAILQ_ENTRY (aiocblist) list; /* List of jobs */ TAILQ_ENTRY (aiocblist) plist; /* List of jobs for proc */ int jobflags; int jobstate; int inputcharge, outputcharge; struct buf *bp; /* buffer pointer */ struct proc *userproc; /* User process */ struct aioproclist *jobaioproc; /* AIO process descriptor */ struct aio_liojob *lio; /* optional lio job */ struct aiocb *uuaiocb; /* pointer in userspace of aiocb */ struct aiocb uaiocb; /* Kernel I/O control block */ }; /* * AIO process info */ #define AIOP_FREE 0x1 /* proc on free queue */ #define AIOP_SCHED 0x2 /* proc explicitly scheduled */ struct aioproclist { int aioprocflags; /* AIO proc flags */ TAILQ_ENTRY(aioproclist) list; /* List of processes */ struct proc *aioproc; /* The AIO thread */ TAILQ_HEAD (,aiocblist) jobtorun; /* suggested job to run */ }; /* * data-structure for lio signal management */ struct aio_liojob { int lioj_flags; int lioj_buffer_count; int lioj_buffer_finished_count; int lioj_queue_count; int lioj_queue_finished_count; struct sigevent lioj_signal; /* signal on all I/O done */ TAILQ_ENTRY (aio_liojob) lioj_list; struct kaioinfo *lioj_ki; }; #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ /* * 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_queue_count; /* size of AIO queue */ int kaio_ballowed_count; /* maximum number of buffers */ int kaio_queue_finished_count; /* number of daemon jobs finished */ int kaio_buffer_count; /* number of physio buffers */ int kaio_buffer_finished_count; /* count of I/O done */ struct proc *kaio_p; /* process that uses this kaio block */ TAILQ_HEAD (,aio_liojob) kaio_liojoblist; /* list of lio jobs */ TAILQ_HEAD (,aiocblist) kaio_jobqueue; /* job queue for process */ TAILQ_HEAD (,aiocblist) kaio_jobdone; /* done queue for process */ TAILQ_HEAD (,aiocblist) kaio_bufqueue; /* buffer job queue for process */ TAILQ_HEAD (,aiocblist) kaio_bufdone; /* buffer done queue for process */ }; #define KAIO_RUNDOWN 0x1 /* process is being run down */ #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */ static TAILQ_HEAD (,aioproclist) aio_freeproc, aio_activeproc; static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */ static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */ static TAILQ_HEAD(,aiocblist) aio_freejobs; /* Pool of free jobs */ 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(void) ; static int aio_aqueue(struct proc *p, struct aiocb *job, int type) ; static void aio_physwakeup(struct buf *bp); static int aio_fphysio(struct proc *p, struct aiocblist *aiocbe, int type); static int aio_qphysio(struct proc *p, struct aiocblist *iocb); static void aio_daemon(void *uproc); SYSINIT(aio, SI_SUB_VFS, SI_ORDER_ANY, aio_onceonly, NULL); static vm_zone_t kaio_zone=0, aiop_zone=0, aiocb_zone=0, aiol_zone=0, aiolio_zone=0; /* * Startup initialization */ void aio_onceonly(void *na) { TAILQ_INIT(&aio_freeproc); TAILQ_INIT(&aio_activeproc); TAILQ_INIT(&aio_jobs); TAILQ_INIT(&aio_bufjobs); TAILQ_INIT(&aio_freejobs); kaio_zone = zinit("AIO", sizeof (struct kaioinfo), 0, 0, 1); aiop_zone = zinit("AIOP", sizeof (struct aioproclist), 0, 0, 1); aiocb_zone = zinit("AIOCB", sizeof (struct aiocblist), 0, 0, 1); aiol_zone = zinit("AIOL", AIO_LISTIO_MAX * sizeof (int), 0, 0, 1); aiolio_zone = zinit("AIOLIO", AIO_LISTIO_MAX * sizeof (struct aio_liojob), 0, 0, 1); aiod_timeout = AIOD_TIMEOUT_DEFAULT; aiod_lifetime = AIOD_LIFETIME_DEFAULT; jobrefid = 1; } /* * Init the per-process aioinfo structure. * The aioinfo limits are set per-process for user limit (resource) management. */ void aio_init_aioinfo(struct proc *p) { struct kaioinfo *ki; if (p->p_aioinfo == NULL) { ki = zalloc(kaio_zone); p->p_aioinfo = ki; 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_queue_count = 0; ki->kaio_ballowed_count = max_buf_aio; ki->kaio_buffer_count = 0; ki->kaio_buffer_finished_count = 0; ki->kaio_p = p; TAILQ_INIT(&ki->kaio_jobdone); TAILQ_INIT(&ki->kaio_jobqueue); TAILQ_INIT(&ki->kaio_bufdone); TAILQ_INIT(&ki->kaio_bufqueue); TAILQ_INIT(&ki->kaio_liojoblist); } } /* * 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. */ int aio_free_entry(struct aiocblist *aiocbe) { struct kaioinfo *ki; struct aioproclist *aiop; struct aio_liojob *lj; struct proc *p; int error; int s; if (aiocbe->jobstate == JOBST_NULL) panic("aio_free_entry: freeing already free job"); p = aiocbe->userproc; ki = p->p_aioinfo; lj = aiocbe->lio; if (ki == NULL) panic("aio_free_entry: missing p->p_aioinfo"); if (aiocbe->jobstate == JOBST_JOBRUNNING) { if (aiocbe->jobflags & AIOCBLIST_ASYNCFREE) return 0; aiocbe->jobflags |= AIOCBLIST_RUNDOWN; tsleep(aiocbe, PRIBIO|PCATCH, "jobwai", 0); } aiocbe->jobflags &= ~AIOCBLIST_ASYNCFREE; if (aiocbe->bp == NULL) { if (ki->kaio_queue_count <= 0) panic("aio_free_entry: process queue size <= 0"); if (num_queue_count <= 0) panic("aio_free_entry: system wide queue size <= 0"); if(lj) { lj->lioj_queue_count--; if (aiocbe->jobflags & AIOCBLIST_DONE) lj->lioj_queue_finished_count--; } ki->kaio_queue_count--; if (aiocbe->jobflags & AIOCBLIST_DONE) ki->kaio_queue_finished_count--; num_queue_count--; } else { if(lj) { lj->lioj_buffer_count--; if (aiocbe->jobflags & AIOCBLIST_DONE) lj->lioj_buffer_finished_count--; } if (aiocbe->jobflags & AIOCBLIST_DONE) ki->kaio_buffer_finished_count--; ki->kaio_buffer_count--; num_buf_aio--; } if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN) && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) { ki->kaio_flags &= ~KAIO_WAKEUP; wakeup(p); } if ( aiocbe->jobstate == JOBST_JOBQBUF) { if ((error = aio_fphysio(p, aiocbe, 1)) != 0) return error; if (aiocbe->jobstate != JOBST_JOBBFINISHED) panic("aio_free_entry: invalid physio finish-up state"); s = splbio(); TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); splx(s); } else if ( aiocbe->jobstate == JOBST_JOBQPROC) { aiop = aiocbe->jobaioproc; TAILQ_REMOVE(&aiop->jobtorun, aiocbe, list); } else if ( aiocbe->jobstate == JOBST_JOBQGLOBAL) { TAILQ_REMOVE(&aio_jobs, aiocbe, list); } else if ( aiocbe->jobstate == JOBST_JOBFINISHED) { TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist); } else if ( aiocbe->jobstate == JOBST_JOBBFINISHED) { s = splbio(); TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); splx(s); if (aiocbe->bp) { vunmapbuf(aiocbe->bp); relpbuf(aiocbe->bp, NULL); aiocbe->bp = NULL; } } if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) { TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); zfree(aiolio_zone, lj); } TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); aiocbe->jobstate = JOBST_NULL; return 0; } /* * Rundown the jobs for a given process. */ void aio_proc_rundown(struct proc *p) { int s; struct kaioinfo *ki; struct aio_liojob *lj, *ljn; struct aiocblist *aiocbe, *aiocbn; ki = p->p_aioinfo; if (ki == NULL) return; ki->kaio_flags |= LIOJ_SIGNAL_POSTED; while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count > ki->kaio_buffer_finished_count)) { ki->kaio_flags |= KAIO_RUNDOWN; if (tsleep(p, PRIBIO, "kaiowt", aiod_timeout)) break; } restart1: for ( aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) { aiocbn = TAILQ_NEXT(aiocbe, plist); if (aio_free_entry(aiocbe)) goto restart1; } restart2: for ( aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue); aiocbe; aiocbe = aiocbn) { aiocbn = TAILQ_NEXT(aiocbe, plist); if (aio_free_entry(aiocbe)) goto restart2; } /* * Note the use of lots of splbio here, trying to avoid * splbio for long chains of I/O. Probably unnecessary. */ restart3: s = splbio(); while (TAILQ_FIRST(&ki->kaio_bufqueue)) { ki->kaio_flags |= KAIO_WAKEUP; tsleep (p, PRIBIO, "aioprn", 0); splx(s); goto restart3; } splx(s); restart4: s = splbio(); for ( aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) { aiocbn = TAILQ_NEXT(aiocbe, plist); if (aio_free_entry(aiocbe)) { splx(s); goto restart4; } } splx(s); for ( lj = TAILQ_FIRST(&ki->kaio_liojoblist); lj; lj = ljn) { ljn = TAILQ_NEXT(lj, lioj_list); if ((lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) { TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); zfree(aiolio_zone, lj); } else { #if defined(DIAGNOSTIC) printf("LIO job not cleaned up: B:%d, BF:%d, Q:%d, QF:%d\n", lj->lioj_buffer_count, lj->lioj_buffer_finished_count, lj->lioj_queue_count, lj->lioj_queue_finished_count); #endif } } zfree(kaio_zone, ki); p->p_aioinfo = NULL; } /* * Select a job to run (called by an AIO daemon) */ static struct aiocblist * aio_selectjob(struct aioproclist *aiop) { struct aiocblist *aiocbe; aiocbe = TAILQ_FIRST(&aiop->jobtorun); if (aiocbe) { TAILQ_REMOVE(&aiop->jobtorun, aiocbe, list); return aiocbe; } for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe = TAILQ_NEXT(aiocbe, list)) { struct kaioinfo *ki; struct proc *userp; userp = aiocbe->userproc; ki = userp->p_aioinfo; if (ki->kaio_active_count < ki->kaio_maxactive_count) { TAILQ_REMOVE(&aio_jobs, aiocbe, list); return aiocbe; } } return NULL; } /* * 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. */ void aio_process(struct aiocblist *aiocbe) { struct filedesc *fdp; struct proc *userp, *mycp; struct aiocb *cb; struct file *fp; struct uio auio; struct iovec aiov; unsigned int fd; int cnt; int error; off_t offset; int oublock_st, oublock_end; int inblock_st, inblock_end; userp = aiocbe->userproc; cb = &aiocbe->uaiocb; mycp = curproc; fdp = mycp->p_fd; fd = cb->aio_fildes; fp = fdp->fd_ofiles[fd]; aiov.iov_base = (void *) cb->aio_buf; aiov.iov_len = cb->aio_nbytes; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = offset = cb->aio_offset; auio.uio_resid = cb->aio_nbytes; cnt = cb->aio_nbytes; auio.uio_segflg = UIO_USERSPACE; auio.uio_procp = mycp; inblock_st = mycp->p_stats->p_ru.ru_inblock; oublock_st = mycp->p_stats->p_ru.ru_oublock; if (cb->aio_lio_opcode == LIO_READ) { auio.uio_rw = UIO_READ; error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred, FOF_OFFSET); } else { auio.uio_rw = UIO_WRITE; error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred, FOF_OFFSET); } 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) { if (auio.uio_resid != cnt) { if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) error = 0; if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) psignal(userp, SIGPIPE); } } cnt -= auio.uio_resid; cb->_aiocb_private.error = error; cb->_aiocb_private.status = cnt; return; } /* * 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 *uproc) { int s; struct aioproclist *aiop; struct vmspace *myvm; struct proc *mycp; /* * Local copies of curproc (cp) and vmspace (myvm) */ mycp = curproc; myvm = mycp->p_vmspace; if (mycp->p_textvp) { vrele(mycp->p_textvp); mycp->p_textvp = NULL; } /* * Allocate and ready the aio control info. There is one * aiop structure per daemon. */ aiop = zalloc(aiop_zone); aiop->aioproc = mycp; aiop->aioprocflags |= AIOP_FREE; TAILQ_INIT(&aiop->jobtorun); /* * Place thread (lightweight process) onto the AIO free thread list */ if (TAILQ_EMPTY(&aio_freeproc)) wakeup(&aio_freeproc); TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); /* * Make up a name for the daemon */ strcpy(mycp->p_comm, "aiod"); /* * Get rid of our current filedescriptors. AIOD's don't need any * filedescriptors, except as temporarily inherited from the client. * Credentials are also cloned, and made equivalent to "root." */ fdfree(mycp); mycp->p_fd = NULL; mycp->p_ucred = crcopy(mycp->p_ucred); mycp->p_ucred->cr_uid = 0; mycp->p_ucred->cr_ngroups = 1; mycp->p_ucred->cr_groups[0] = 1; /* * The daemon resides in its own pgrp. */ enterpgrp(mycp, mycp->p_pid, 1); /* * Mark special process type */ mycp->p_flag |= P_SYSTEM|P_KTHREADP; /* * Wakeup parent process. (Parent sleeps to keep from blasting away * creating to many daemons.) */ wakeup(mycp); while(1) { struct proc *curcp; struct aiocblist *aiocbe; /* * curcp is the current daemon process context. * userp is the current user process context. */ curcp = mycp; /* * Take daemon off of free queue */ if (aiop->aioprocflags & AIOP_FREE) { TAILQ_REMOVE(&aio_freeproc, aiop, list); TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); aiop->aioprocflags &= ~AIOP_FREE; } aiop->aioprocflags &= ~AIOP_SCHED; /* * Check for jobs */ while ((aiocbe = aio_selectjob(aiop)) != NULL) { struct proc *userp; struct aiocb *cb; struct kaioinfo *ki; struct aio_liojob *lj; cb = &aiocbe->uaiocb; userp = aiocbe->userproc; aiocbe->jobstate = JOBST_JOBRUNNING; /* * Connect to process address space for user program */ if (userp != curcp) { struct vmspace *tmpvm; /* * 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; mycp->p_vmspace->vm_refcnt++; /* * Activate the new mapping. */ pmap_activate(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); } /* * Disassociate from previous clients file descriptors, and * associate to the new clients descriptors. Note that * the daemon doesn't need to worry about its orginal * descriptors, because they were originally freed. */ if (mycp->p_fd) fdfree(mycp); mycp->p_fd = fdshare(userp); curcp = userp; } ki = userp->p_aioinfo; lj = aiocbe->lio; /* * Account for currently active jobs */ ki->kaio_active_count++; /* * Do the I/O function */ aiocbe->jobaioproc = aiop; aio_process(aiocbe); /* * decrement the active job count */ ki->kaio_active_count--; /* * increment the completion count for wakeup/signal comparisons */ aiocbe->jobflags |= AIOCBLIST_DONE; ki->kaio_queue_finished_count++; if (lj) { lj->lioj_queue_finished_count++; } if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) { ki->kaio_flags &= ~KAIO_WAKEUP; wakeup(userp); } s = splbio(); if (lj && (lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) { if ((lj->lioj_queue_finished_count == lj->lioj_queue_count) && (lj->lioj_buffer_finished_count == lj->lioj_buffer_count)) { psignal(userp, lj->lioj_signal.sigev_signo); lj->lioj_flags |= LIOJ_SIGNAL_POSTED; } } splx(s); aiocbe->jobstate = JOBST_JOBFINISHED; /* * If the I/O request should be automatically rundown, do the * needed cleanup. Otherwise, place the queue entry for * the just finished I/O request into the done queue for the * associated client. */ if (aiocbe->jobflags & AIOCBLIST_ASYNCFREE) { aiocbe->jobflags &= ~AIOCBLIST_ASYNCFREE; TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); } else { TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist); } if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) { wakeup(aiocbe); aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN; } if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) { psignal(userp, cb->aio_sigevent.sigev_signo); } } /* * Disconnect from user address space */ if (curcp != mycp) { struct vmspace *tmpvm; /* * 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(mycp); #if defined(DIAGNOSTIC) if (tmpvm == myvm) printf("AIOD: vmspace problem -- %d\n", mycp->p_pid); #endif /* * remove our vmspace reference. */ vmspace_free(tmpvm); /* * disassociate from the user process's file descriptors. */ if (mycp->p_fd) fdfree(mycp); mycp->p_fd = NULL; curcp = mycp; } /* * If we are the first to be put onto the free queue, wakeup * anyone waiting for a daemon. */ TAILQ_REMOVE(&aio_activeproc, aiop, list); if (TAILQ_EMPTY(&aio_freeproc)) wakeup(&aio_freeproc); TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); aiop->aioprocflags |= AIOP_FREE; /* * If daemon is inactive for a long time, allow it to exit, thereby * freeing resources. */ if (((aiop->aioprocflags & AIOP_SCHED) == 0) && tsleep(mycp, PRIBIO, "aiordy", aiod_lifetime)) { if ((TAILQ_FIRST(&aio_jobs) == NULL) && (TAILQ_FIRST(&aiop->jobtorun) == NULL)) { if ((aiop->aioprocflags & AIOP_FREE) && (num_aio_procs > target_aio_procs)) { TAILQ_REMOVE(&aio_freeproc, aiop, list); zfree(aiop_zone, aiop); num_aio_procs--; #if defined(DIAGNOSTIC) if (mycp->p_vmspace->vm_refcnt <= 1) printf("AIOD: bad vm refcnt for exiting daemon: %d\n", mycp->p_vmspace->vm_refcnt); #endif exit1(mycp, 0); } } } } } /* * 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 error; struct proc *p, *np; p = &proc0; error = fork1(p, RFPROC|RFMEM|RFNOWAIT, &np); if (error) return error; cpu_set_fork_handler(np, aio_daemon, curproc); /* * Wait until daemon is started, but continue on just in case (to * handle error conditions. */ error = tsleep(np, PZERO, "aiosta", aiod_timeout); num_aio_procs++; return error; } /* * Try the high-performance physio method for eligible VCHR devices. This * routine doesn't require the use of any additional threads, and have * overhead. */ int aio_qphysio(p, aiocbe) struct proc *p; struct aiocblist *aiocbe; { int error; struct aiocb *cb; struct file *fp; struct buf *bp; int bflags; struct vnode *vp; struct kaioinfo *ki; struct filedesc *fdp; struct aio_liojob *lj; int fd; int s; int cnt; dev_t dev; int rw; d_strategy_t *fstrategy; struct cdevsw *cdev; struct cdevsw *bdev; cb = &aiocbe->uaiocb; fdp = p->p_fd; fd = cb->aio_fildes; fp = fdp->fd_ofiles[fd]; if (fp->f_type != DTYPE_VNODE) { return -1; } vp = (struct vnode *)fp->f_data; if (vp->v_type != VCHR || ((cb->aio_nbytes & (DEV_BSIZE - 1)) != 0)) { return -1; } if ((cb->aio_nbytes > MAXPHYS) && (num_buf_aio >= max_buf_aio)) { return -1; } if ((vp->v_rdev == NULL) || (vp->v_flag & VISTTY)) { return -1; } if (vp->v_rdev == NODEV) { return -1; } cdev = devsw(vp->v_rdev); if (cdev == NULL) { return -1; } if (cdev->d_bmaj == -1) { return -1; } bdev = cdev; ki = p->p_aioinfo; if (ki->kaio_buffer_count >= ki->kaio_ballowed_count) { return -1; } cnt = cb->aio_nbytes; if (cnt > MAXPHYS) { return -1; } dev = makebdev(bdev->d_bmaj, minor(vp->v_rdev)); /* * Physical I/O is charged directly to the process, so we don't have * to fake it. */ aiocbe->inputcharge = 0; aiocbe->outputcharge = 0; ki->kaio_buffer_count++; lj = aiocbe->lio; if (lj) { lj->lioj_buffer_count++; } /* create and build a buffer header for a transfer */ bp = (struct buf *)getpbuf(NULL); /* * get a copy of the kva from the physical buffer */ bp->b_caller1 = p; bp->b_dev = dev; error = bp->b_error = 0; if (cb->aio_lio_opcode == LIO_WRITE) { rw = 0; bflags = B_WRITE; } else { rw = 1; bflags = B_READ; } bp->b_bcount = cb->aio_nbytes; bp->b_bufsize = cb->aio_nbytes; bp->b_flags = B_PHYS | B_CALL | bflags; bp->b_iodone = aio_physwakeup; bp->b_saveaddr = bp->b_data; bp->b_data = (void *) cb->aio_buf; bp->b_blkno = btodb(cb->aio_offset); if (rw && !useracc(bp->b_data, bp->b_bufsize, B_WRITE)) { error = EFAULT; goto doerror; } if (!rw && !useracc(bp->b_data, bp->b_bufsize, B_READ)) { error = EFAULT; goto doerror; } /* bring buffer into kernel space */ vmapbuf(bp); s = splbio(); aiocbe->bp = bp; bp->b_spc = (void *)aiocbe; TAILQ_INSERT_TAIL(&aio_bufjobs, aiocbe, list); TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist); aiocbe->jobstate = JOBST_JOBQBUF; cb->_aiocb_private.status = cb->aio_nbytes; num_buf_aio++; fstrategy = bdev->d_strategy; bp->b_error = 0; splx(s); /* perform transfer */ (*fstrategy)(bp); s = splbio(); /* * If we had an error invoking the request, or an error in processing * the request before we have returned, we process it as an error * in transfer. Note that such an I/O error is not indicated immediately, * but is returned using the aio_error mechanism. In this case, aio_suspend * will return immediately. */ if (bp->b_error || (bp->b_flags & B_ERROR)) { struct aiocb *job = aiocbe->uuaiocb; aiocbe->uaiocb._aiocb_private.status = 0; suword(&job->_aiocb_private.status, 0); aiocbe->uaiocb._aiocb_private.error = bp->b_error; suword(&job->_aiocb_private.error, bp->b_error); ki->kaio_buffer_finished_count++; if (aiocbe->jobstate != JOBST_JOBBFINISHED) { aiocbe->jobstate = JOBST_JOBBFINISHED; aiocbe->jobflags |= AIOCBLIST_DONE; TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); } } splx(s); return 0; doerror: ki->kaio_buffer_count--; if (lj) { lj->lioj_buffer_count--; } aiocbe->bp = NULL; relpbuf(bp, NULL); return error; } /* * This waits/tests physio completion. */ int aio_fphysio(p, iocb, flgwait) struct proc *p; struct aiocblist *iocb; int flgwait; { int s; struct buf *bp; int error; bp = iocb->bp; s = splbio(); if (flgwait == 0) { if ((bp->b_flags & B_DONE) == 0) { splx(s); return EINPROGRESS; } } while ((bp->b_flags & B_DONE) == 0) { if (tsleep((caddr_t)bp, PRIBIO, "physstr", aiod_timeout)) { if ((bp->b_flags & B_DONE) == 0) { splx(s); return EINPROGRESS; } else { break; } } } /* release mapping into kernel space */ vunmapbuf(bp); iocb->bp = 0; error = 0; /* * check for an error */ if (bp->b_flags & B_ERROR) { error = bp->b_error; } relpbuf(bp, NULL); return (error); } /* * Queue a new AIO request. Choosing either the threaded or direct physio * VCHR technique is done in this code. */ static int _aio_aqueue(struct proc *p, struct aiocb *job, struct aio_liojob *lj, int type) { struct filedesc *fdp; struct file *fp; unsigned int fd; int error; int opcode; struct aiocblist *aiocbe; struct aioproclist *aiop; struct kaioinfo *ki; if ((aiocbe = TAILQ_FIRST(&aio_freejobs)) != NULL) { TAILQ_REMOVE(&aio_freejobs, aiocbe, list); } else { aiocbe = zalloc (aiocb_zone); } aiocbe->inputcharge = 0; aiocbe->outputcharge = 0; suword(&job->_aiocb_private.status, -1); suword(&job->_aiocb_private.error, 0); suword(&job->_aiocb_private.kernelinfo, -1); error = copyin((caddr_t)job, (caddr_t) &aiocbe->uaiocb, sizeof aiocbe->uaiocb); if (error) { suword(&job->_aiocb_private.error, error); TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); return error; } /* * 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; /* * Get the fd info for process */ fdp = p->p_fd; /* * Range check file descriptor */ fd = aiocbe->uaiocb.aio_fildes; if (fd >= fdp->fd_nfiles) { TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); if (type == 0) { suword(&job->_aiocb_private.error, EBADF); } return EBADF; } fp = fdp->fd_ofiles[fd]; if ((fp == NULL) || ((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) == 0))) { TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); if (type == 0) { suword(&job->_aiocb_private.error, EBADF); } return EBADF; } if (aiocbe->uaiocb.aio_offset == -1LL) { TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); if (type == 0) { suword(&job->_aiocb_private.error, EINVAL); } return EINVAL; } error = suword(&job->_aiocb_private.kernelinfo, jobrefid); if (error) { TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); if (type == 0) { suword(&job->_aiocb_private.error, EINVAL); } return error; } aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid; if (jobrefid == LONG_MAX) jobrefid = 1; else jobrefid++; if (opcode == LIO_NOP) { TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); if (type == 0) { suword(&job->_aiocb_private.error, 0); suword(&job->_aiocb_private.status, 0); suword(&job->_aiocb_private.kernelinfo, 0); } return 0; } if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) { TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); if (type == 0) { suword(&job->_aiocb_private.status, 0); suword(&job->_aiocb_private.error, EINVAL); } return EINVAL; } suword(&job->_aiocb_private.error, EINPROGRESS); aiocbe->uaiocb._aiocb_private.error = EINPROGRESS; aiocbe->userproc = p; aiocbe->jobflags = 0; aiocbe->lio = lj; ki = p->p_aioinfo; if ((error = aio_qphysio(p, aiocbe)) == 0) { return 0; } else if (error > 0) { suword(&job->_aiocb_private.status, 0); aiocbe->uaiocb._aiocb_private.error = error; suword(&job->_aiocb_private.error, error); return error; } /* * No buffer for daemon I/O */ aiocbe->bp = NULL; ki->kaio_queue_count++; if (lj) { lj->lioj_queue_count++; } TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list); aiocbe->jobstate = JOBST_JOBQGLOBAL; num_queue_count++; error = 0; /* * 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: if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { TAILQ_REMOVE(&aio_freeproc, aiop, list); TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); aiop->aioprocflags &= ~AIOP_FREE; wakeup(aiop->aioproc); } 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++; if ((error = aio_newproc()) == 0) { num_aio_resv_start--; p->p_retval[0] = 0; goto retryproc; } num_aio_resv_start--; } return error; } /* * This routine queues an AIO request, checking for quotas. */ static int aio_aqueue(struct proc *p, struct aiocb *job, int type) { struct kaioinfo *ki; if (p->p_aioinfo == NULL) { aio_init_aioinfo(p); } if (num_queue_count >= max_queue_count) return EAGAIN; ki = p->p_aioinfo; if (ki->kaio_queue_count >= ki->kaio_qallowed_count) return EAGAIN; return _aio_aqueue(p, job, NULL, type); } /* * Support the aio_return system call, as a side-effect, kernel * resources are released. */ int aio_return(struct proc *p, struct aio_return_args *uap) { int s; int jobref; struct aiocblist *cb, *ncb; struct aiocb *ujob; struct kaioinfo *ki; ki = p->p_aioinfo; if (ki == NULL) { return EINVAL; } ujob = uap->aiocbp; jobref = fuword(&ujob->_aiocb_private.kernelinfo); if (jobref == -1 || jobref == 0) return EINVAL; for (cb = TAILQ_FIRST(&ki->kaio_jobdone); cb; cb = TAILQ_NEXT(cb, plist)) { if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == jobref) { if (ujob == cb->uuaiocb) { p->p_retval[0] = cb->uaiocb._aiocb_private.status; } else { p->p_retval[0] = EFAULT; } if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { curproc->p_stats->p_ru.ru_oublock += cb->outputcharge; cb->outputcharge = 0; } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { curproc->p_stats->p_ru.ru_inblock += cb->inputcharge; cb->inputcharge = 0; } aio_free_entry(cb); return 0; } } s = splbio(); for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) { ncb = TAILQ_NEXT(cb, plist); if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == jobref) { splx(s); if (ujob == cb->uuaiocb) { p->p_retval[0] = cb->uaiocb._aiocb_private.status; } else { p->p_retval[0] = EFAULT; } aio_free_entry(cb); return 0; } } splx(s); return (EINVAL); } /* * Allow a process to wakeup when any of the I/O requests are * completed. */ int aio_suspend(struct proc *p, struct aio_suspend_args *uap) { struct timeval atv; struct timespec ts; struct aiocb *const *cbptr, *cbp; struct kaioinfo *ki; struct aiocblist *cb; int i; int njoblist; int error, s, timo; int *ijoblist; struct aiocb **ujoblist; if (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; ijoblist = zalloc(aiol_zone); ujoblist = zalloc(aiol_zone); cbptr = uap->aiocbp; for(i = 0; i < uap->nent; i++) { cbp = (struct aiocb *) (intptr_t) fuword((caddr_t) &cbptr[i]); if (cbp == 0) continue; ujoblist[njoblist] = cbp; ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo); njoblist++; } if (njoblist == 0) { zfree(aiol_zone, ijoblist); zfree(aiol_zone, ujoblist); return 0; } error = 0; while (1) { for (cb = TAILQ_FIRST(&ki->kaio_jobdone); cb; cb = TAILQ_NEXT(cb, plist)) { for(i = 0; i < njoblist; i++) { if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == ijoblist[i]) { if (ujoblist[i] != cb->uuaiocb) error = EINVAL; zfree(aiol_zone, ijoblist); zfree(aiol_zone, ujoblist); return error; } } } s = splbio(); for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb, plist)) { for(i = 0; i < njoblist; i++) { if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == ijoblist[i]) { splx(s); if (ujoblist[i] != cb->uuaiocb) error = EINVAL; zfree(aiol_zone, ijoblist); zfree(aiol_zone, ujoblist); return error; } } } ki->kaio_flags |= KAIO_WAKEUP; error = tsleep(p, PRIBIO|PCATCH, "aiospn", timo); splx(s); if (error == EINTR) { zfree(aiol_zone, ijoblist); zfree(aiol_zone, ujoblist); return EINTR; } else if (error == EWOULDBLOCK) { zfree(aiol_zone, ijoblist); zfree(aiol_zone, ujoblist); return EAGAIN; } } /* NOTREACHED */ return EINVAL; } /* * aio_cancel at the kernel level is a NOOP right now. It * might be possible to support it partially in user mode, or * in kernel mode later on. */ int aio_cancel(struct proc *p, struct aio_cancel_args *uap) { return ENOSYS; } /* * 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 proc *p, struct aio_error_args *uap) { int s; struct aiocblist *cb; struct kaioinfo *ki; int jobref; ki = p->p_aioinfo; if (ki == NULL) return EINVAL; jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo); if ((jobref == -1) || (jobref == 0)) return EINVAL; for (cb = TAILQ_FIRST(&ki->kaio_jobdone); cb; cb = TAILQ_NEXT(cb, plist)) { if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == jobref) { p->p_retval[0] = cb->uaiocb._aiocb_private.error; return 0; } } for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb, plist)) { if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == jobref) { p->p_retval[0] = EINPROGRESS; return 0; } } s = splbio(); for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb, plist)) { if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == jobref) { p->p_retval[0] = cb->uaiocb._aiocb_private.error; splx(s); return 0; } } for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb, plist)) { if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == jobref) { p->p_retval[0] = EINPROGRESS; splx(s); return 0; } } splx(s); /* * Hack for lio */ /* status = fuword(&uap->aiocbp->_aiocb_private.status); if (status == -1) { return fuword(&uap->aiocbp->_aiocb_private.error); } */ return EINVAL; } int aio_read(struct proc *p, struct aio_read_args *uap) { struct filedesc *fdp; struct file *fp; struct uio auio; struct iovec aiov; unsigned int fd; int cnt; struct aiocb iocb; int error, pmodes; pmodes = fuword(&uap->aiocbp->_aiocb_private.privatemodes); if ((pmodes & AIO_PMODE_SYNC) == 0) { return aio_aqueue(p, (struct aiocb *) uap->aiocbp, LIO_READ); } /* * Get control block */ if ((error = copyin((caddr_t) uap->aiocbp, (caddr_t) &iocb, sizeof iocb)) != 0) return error; /* * Get the fd info for process */ fdp = p->p_fd; /* * Range check file descriptor */ fd = iocb.aio_fildes; if (fd >= fdp->fd_nfiles) return EBADF; fp = fdp->fd_ofiles[fd]; if ((fp == NULL) || ((fp->f_flag & FREAD) == 0)) return EBADF; if (iocb.aio_offset == -1LL) return EINVAL; auio.uio_resid = iocb.aio_nbytes; if (auio.uio_resid < 0) return (EINVAL); /* * Process sync simply -- queue async request. */ if ((iocb._aiocb_private.privatemodes & AIO_PMODE_SYNC) == 0) { return aio_aqueue(p, (struct aiocb *) uap->aiocbp, LIO_READ); } aiov.iov_base = (void *) iocb.aio_buf; aiov.iov_len = iocb.aio_nbytes; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = iocb.aio_offset; auio.uio_rw = UIO_READ; auio.uio_segflg = UIO_USERSPACE; auio.uio_procp = p; cnt = iocb.aio_nbytes; error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred, FOF_OFFSET); if (error && (auio.uio_resid != cnt) && (error == ERESTART || error == EINTR || error == EWOULDBLOCK)) error = 0; cnt -= auio.uio_resid; p->p_retval[0] = cnt; return error; } int aio_write(struct proc *p, struct aio_write_args *uap) { struct filedesc *fdp; struct file *fp; struct uio auio; struct iovec aiov; unsigned int fd; int cnt; struct aiocb iocb; int error; int pmodes; /* * Process sync simply -- queue async request. */ pmodes = fuword(&uap->aiocbp->_aiocb_private.privatemodes); if ((pmodes & AIO_PMODE_SYNC) == 0) { return aio_aqueue(p, (struct aiocb *) uap->aiocbp, LIO_WRITE); } if ((error = copyin((caddr_t) uap->aiocbp, (caddr_t) &iocb, sizeof iocb)) != 0) return error; /* * Get the fd info for process */ fdp = p->p_fd; /* * Range check file descriptor */ fd = iocb.aio_fildes; if (fd >= fdp->fd_nfiles) return EBADF; fp = fdp->fd_ofiles[fd]; if ((fp == NULL) || ((fp->f_flag & FWRITE) == 0)) return EBADF; if (iocb.aio_offset == -1LL) return EINVAL; aiov.iov_base = (void *) iocb.aio_buf; aiov.iov_len = iocb.aio_nbytes; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = iocb.aio_offset; auio.uio_resid = iocb.aio_nbytes; if (auio.uio_resid < 0) return (EINVAL); auio.uio_rw = UIO_WRITE; auio.uio_segflg = UIO_USERSPACE; auio.uio_procp = p; cnt = iocb.aio_nbytes; error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred, FOF_OFFSET); if (error) { if (auio.uio_resid != cnt) { if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) error = 0; if (error == EPIPE) psignal(p, SIGPIPE); } } cnt -= auio.uio_resid; p->p_retval[0] = cnt; return error; } int lio_listio(struct proc *p, struct lio_listio_args *uap) { int nent, nentqueued; struct aiocb *iocb, * const *cbptr; struct aiocblist *cb; struct kaioinfo *ki; struct aio_liojob *lj; int error, runningcode; int nerror; int i; int s; if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) { return EINVAL; } nent = uap->nent; if (nent > AIO_LISTIO_MAX) { return EINVAL; } if (p->p_aioinfo == NULL) { aio_init_aioinfo(p); } if ((nent + num_queue_count) > max_queue_count) { return EAGAIN; } ki = p->p_aioinfo; if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) { return EAGAIN; } lj = zalloc(aiolio_zone); if (!lj) { return EAGAIN; } lj->lioj_flags = 0; lj->lioj_buffer_count = 0; lj->lioj_buffer_finished_count = 0; lj->lioj_queue_count = 0; lj->lioj_queue_finished_count = 0; lj->lioj_ki = ki; TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); /* * Setup signal */ if (uap->sig && (uap->mode == LIO_NOWAIT)) { error = copyin(uap->sig, &lj->lioj_signal, sizeof lj->lioj_signal); if (error) return error; lj->lioj_flags |= LIOJ_SIGNAL; lj->lioj_flags &= ~LIOJ_SIGNAL_POSTED; } else { lj->lioj_flags &= ~LIOJ_SIGNAL; } /* * get pointers to the list of I/O requests */ nerror = 0; nentqueued = 0; cbptr = uap->acb_list; for(i = 0; i < uap->nent; i++) { iocb = (struct aiocb *) (intptr_t) fuword((caddr_t) &cbptr[i]); if (((intptr_t) iocb != -1) && ((intptr_t) iocb != NULL)) { error = _aio_aqueue(p, iocb, lj, 0); if (error == 0) { nentqueued++; } else { nerror++; } } } /* * If we haven't queued any, then just return error */ if (nentqueued == 0) { return 0; } /* * Calculate the appropriate error return */ runningcode = 0; if (nerror) runningcode = EIO; if (uap->mode == LIO_WAIT) { while (1) { int found; found = 0; for(i = 0; i < uap->nent; i++) { int jobref, command; /* * Fetch address of the control buf pointer in user space */ iocb = (struct aiocb *) (intptr_t) fuword((caddr_t) &cbptr[i]); if (((intptr_t) iocb == -1) || ((intptr_t) iocb == 0)) continue; /* * Fetch the associated command from user space */ command = fuword(&iocb->aio_lio_opcode); if (command == LIO_NOP) { found++; continue; } jobref = fuword(&iocb->_aiocb_private.kernelinfo); for (cb = TAILQ_FIRST(&ki->kaio_jobdone); cb; cb = TAILQ_NEXT(cb, plist)) { if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == jobref) { if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { curproc->p_stats->p_ru.ru_oublock += cb->outputcharge; cb->outputcharge = 0; } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { curproc->p_stats->p_ru.ru_inblock += cb->inputcharge; cb->inputcharge = 0; } found++; break; } } s = splbio(); for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb, plist)) { if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == jobref) { found++; break; } } splx(s); } /* * If all I/Os have been disposed of, then we can return */ if (found == nentqueued) { return runningcode; } ki->kaio_flags |= KAIO_WAKEUP; error = tsleep(p, PRIBIO|PCATCH, "aiospn", 0); if (error == EINTR) { return EINTR; } else if (error == EWOULDBLOCK) { return EAGAIN; } } } return runningcode; } /* * This is a wierd hack so that we can post a signal. It is safe * to do so from a timeout routine, but *not* from an interrupt routine. */ static void process_signal(void *ljarg) { struct aio_liojob *lj = ljarg; if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) { if (lj->lioj_queue_count == lj->lioj_queue_finished_count) { psignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo); lj->lioj_flags |= LIOJ_SIGNAL_POSTED; } } } /* * Interrupt handler for physio, performs the necessary process wakeups, * and signals. */ static void aio_physwakeup(bp) struct buf *bp; { struct aiocblist *aiocbe; struct proc *p; struct kaioinfo *ki; struct aio_liojob *lj; int s; s = splbio(); wakeup((caddr_t) bp); bp->b_flags &= ~B_CALL; bp->b_flags |= B_DONE; aiocbe = (struct aiocblist *)bp->b_spc; if (aiocbe) { p = bp->b_caller1; aiocbe->jobstate = JOBST_JOBBFINISHED; aiocbe->uaiocb._aiocb_private.status -= bp->b_resid; aiocbe->uaiocb._aiocb_private.error = 0; aiocbe->jobflags |= AIOCBLIST_DONE; if (bp->b_flags & B_ERROR) { aiocbe->uaiocb._aiocb_private.error = bp->b_error; } lj = aiocbe->lio; if (lj) { lj->lioj_buffer_finished_count++; /* * wakeup/signal if all of the interrupt jobs are done */ if (lj->lioj_buffer_finished_count == lj->lioj_buffer_count) { /* * post a signal if it is called for */ if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) { lj->lioj_flags |= LIOJ_SIGNAL_POSTED; timeout(process_signal, lj, 0); } } } ki = p->p_aioinfo; if (ki) { ki->kaio_buffer_finished_count++; TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); /* * and do the wakeup */ if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) { ki->kaio_flags &= ~KAIO_WAKEUP; wakeup(p); } } } splx(s); }