1379 lines
31 KiB
C
1379 lines
31 KiB
C
/*
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* Copyright (c) 1997 John S. Dyson. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. John S. Dyson's name may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* DISCLAIMER: This code isn't warranted to do anything useful. Anything
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* bad that happens because of using this software isn't the responsibility
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* of the author. This software is distributed AS-IS.
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*
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* $Id: vfs_aio.c,v 1.9 1997/11/06 19:29:27 phk Exp $
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*/
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/*
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* This file contains support for the POSIX.4 AIO facility.
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*
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* The initial version provides only the (bogus) synchronous semantics
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* but will support async in the future. Note that a bit
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* in a private field allows the user mode subroutine to adapt
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* the kernel operations to true POSIX.4 for future compatibility.
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*
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* This code is used to support true POSIX.4 AIO/LIO with the help
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* of a user mode subroutine package. Note that eventually more support
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* will be pushed into the kernel.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <sys/malloc.h>
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#include <sys/signalvar.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_extern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <sys/aio.h>
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#include <sys/shm.h>
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#include <machine/cpu.h>
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static MALLOC_DEFINE(M_AIO, "AIO", "AIO structure(s)");
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#define AIOCBLIST_CANCELLED 0x1
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#define AIOCBLIST_RUNDOWN 0x4
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#define AIOCBLIST_ASYNCFREE 0x8
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#define AIOCBLIST_SUSPEND 0x10
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#if 0
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#define DEBUGAIO
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#define DIAGNOSTIC
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#endif
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#define DEBUGAIO 1
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static int jobrefid;
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#define JOBST_NULL 0x0
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#define JOBST_JOBQPROC 0x1
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#define JOBST_JOBQGLOBAL 0x2
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#define JOBST_JOBRUNNING 0x3
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#define JOBST_JOBFINISHED 0x4
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#define MAX_AIO_PER_PROC 32
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#define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */
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#define MAX_AIO_PROCS 128
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#define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */
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#define TARGET_AIO_PROCS 64
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int max_aio_procs = MAX_AIO_PROCS;
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int num_aio_procs = 0;
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int target_aio_procs = TARGET_AIO_PROCS;
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int max_queue_count = MAX_AIO_QUEUE;
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int num_queue_count = 0;
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int max_aio_per_proc = MAX_AIO_PER_PROC,
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max_aio_queue_per_proc=MAX_AIO_QUEUE_PER_PROC;
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SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "AIO mgmt");
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SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc,
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CTLFLAG_RW, &max_aio_per_proc, 0, "");
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SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc,
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CTLFLAG_RW, &max_aio_queue_per_proc, 0, "");
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SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs,
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CTLFLAG_RW, &max_aio_procs, 0, "");
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SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs,
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CTLFLAG_RD, &num_aio_procs, 0, "");
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SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count,
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CTLFLAG_RD, &num_queue_count, 0, "");
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SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue,
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CTLFLAG_RW, &max_queue_count, 0, "");
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SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs,
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CTLFLAG_RW, &target_aio_procs, 0, "");
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#if DEBUGAIO > 0
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static int debugaio;
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SYSCTL_INT(_vfs_aio, OID_AUTO, debugaio, CTLFLAG_RW, &debugaio, 0, "");
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#endif
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/*
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* Job queue item
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*/
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struct aiocblist {
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TAILQ_ENTRY (aiocblist) list; /* List of jobs */
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TAILQ_ENTRY (aiocblist) plist; /* List of jobs for proc */
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int jobflags;
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int jobstate;
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struct proc *userproc; /* User process */
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struct aioproclist *jobaioproc; /* AIO process descriptor */
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struct aiocb uaiocb; /* Kernel I/O control block */
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};
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#define AIOP_FREE 0x1 /* proc on free queue */
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/*
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* AIO process info
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*/
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struct aioproclist {
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int aioprocflags; /* AIO proc flags */
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TAILQ_ENTRY(aioproclist) list; /* List of processes */
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struct proc *aioproc; /* The AIO thread */
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TAILQ_HEAD (,aiocblist) jobtorun; /* suggested job to run */
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};
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struct kaioinfo {
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int kaio_maxactive_count; /* maximum number of AIOs */
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int kaio_active_count; /* number of currently used AIOs */
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int kaio_qallowed_count; /* maxiumu size of AIO queue */
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int kaio_queue_count; /* size of AIO queue */
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TAILQ_HEAD (,aiocblist) kaio_jobqueue; /* job queue for process */
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TAILQ_HEAD (,aiocblist) kaio_jobdone; /* done queue for process */
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};
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TAILQ_HEAD (,aioproclist) aio_freeproc, aio_activeproc;
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TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */
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TAILQ_HEAD(,aiocblist) aio_freejobs;
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void aio_init_aioinfo(struct proc *p) ;
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void aio_onceonly(void *) ;
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int aio_free_entry(struct aiocblist *aiocbe);
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void aio_cancel_internal(struct aiocblist *aiocbe);
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void aio_process(struct aiocblist *aiocbe);
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void pmap_newvmspace(struct vmspace *);
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static int aio_newproc(void) ;
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static int aio_aqueue(struct proc *p, struct aiocb *job, int type) ;
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static void aio_marksuspend(struct proc *p, int njobs, int *joblist, int set) ;
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SYSINIT(aio, SI_SUB_VFS, SI_ORDER_ANY, aio_onceonly, NULL);
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/*
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* Startup initialization
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*/
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void
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aio_onceonly(void *na) {
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TAILQ_INIT(&aio_freeproc);
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TAILQ_INIT(&aio_activeproc);
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TAILQ_INIT(&aio_jobs);
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TAILQ_INIT(&aio_freejobs);
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}
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/*
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* Init the per-process aioinfo structure.
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*/
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void
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aio_init_aioinfo(struct proc *p) {
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struct kaioinfo *ki;
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if (p->p_aioinfo == NULL) {
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ki = malloc(sizeof (struct kaioinfo), M_AIO, M_WAITOK);
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p->p_aioinfo = ki;
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ki->kaio_maxactive_count = max_aio_per_proc;
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ki->kaio_active_count = 0;
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ki->kaio_qallowed_count = max_aio_queue_per_proc;
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ki->kaio_queue_count = 0;
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TAILQ_INIT(&ki->kaio_jobdone);
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TAILQ_INIT(&ki->kaio_jobqueue);
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}
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}
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/*
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* Free a job entry. Wait for completion if it is currently
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* active, but don't delay forever. If we delay, we return
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* a flag that says that we have to restart the queue scan.
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*/
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int
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aio_free_entry(struct aiocblist *aiocbe) {
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struct kaioinfo *ki;
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struct aioproclist *aiop;
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struct proc *p;
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if (aiocbe->jobstate == JOBST_NULL)
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panic("aio_free_entry: freeing already free job");
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p = aiocbe->userproc;
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ki = p->p_aioinfo;
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if (ki == NULL)
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panic("aio_free_entry: missing p->p_aioinfo");
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if (aiocbe->jobstate == JOBST_JOBRUNNING) {
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if (aiocbe->jobflags & AIOCBLIST_ASYNCFREE)
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return 0;
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aiocbe->jobflags |= AIOCBLIST_RUNDOWN;
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tsleep(aiocbe, PRIBIO|PCATCH, "jobwai", 0);
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/*
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if (tsleep(aiocbe, PRIBIO|PCATCH, "jobwai", hz*5)) {
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aiocbe->jobflags |= AIOCBLIST_ASYNCFREE;
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aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
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return 1;
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}
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aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
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*/
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}
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aiocbe->jobflags &= ~AIOCBLIST_ASYNCFREE;
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if (ki->kaio_queue_count <= 0)
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panic("aio_free_entry: process queue size <= 0");
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if (num_queue_count <= 0)
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panic("aio_free_entry: system wide queue size <= 0");
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--ki->kaio_queue_count;
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--num_queue_count;
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#if DEBUGAIO > 0
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if (debugaio > 0)
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printf("freeing entry: %d, %d\n",
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ki->kaio_queue_count, num_queue_count);
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#endif
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if ( aiocbe->jobstate == JOBST_JOBQPROC) {
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aiop = aiocbe->jobaioproc;
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TAILQ_REMOVE(&aiop->jobtorun, aiocbe, list);
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} else if ( aiocbe->jobstate == JOBST_JOBQGLOBAL) {
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TAILQ_REMOVE(&aio_jobs, aiocbe, list);
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} else if ( aiocbe->jobstate == JOBST_JOBFINISHED) {
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ki = p->p_aioinfo;
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TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist);
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}
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TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
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aiocbe->jobstate = JOBST_NULL;
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return 0;
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}
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/*
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* Rundown the jobs for a given process.
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*/
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void
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aio_proc_rundown(struct proc *p) {
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struct kaioinfo *ki;
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struct aiocblist *aiocbe, *aiocbn;
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ki = p->p_aioinfo;
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if (ki == NULL)
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return;
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while (ki->kaio_active_count > 0) {
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if (tsleep(ki, PRIBIO, "kaiowt", 60 * hz))
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break;
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}
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#if DEBUGAIO > 0
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if (debugaio > 0)
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printf("Proc rundown: %d %d\n",
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num_queue_count, ki->kaio_queue_count);
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#endif
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restart1:
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for ( aiocbe = TAILQ_FIRST(&ki->kaio_jobdone);
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aiocbe;
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aiocbe = aiocbn) {
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aiocbn = TAILQ_NEXT(aiocbe, plist);
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if (aio_free_entry(aiocbe))
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goto restart1;
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}
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restart2:
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for ( aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue);
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aiocbe;
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aiocbe = aiocbn) {
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aiocbn = TAILQ_NEXT(aiocbe, plist);
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if (aio_free_entry(aiocbe))
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goto restart2;
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}
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free(ki, M_AIO);
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p->p_aioinfo = NULL;
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}
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/*
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* Select a job to run (called by an AIO daemon)
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*/
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static struct aiocblist *
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aio_selectjob(struct aioproclist *aiop) {
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struct aiocblist *aiocbe;
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aiocbe = TAILQ_FIRST(&aiop->jobtorun);
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if (aiocbe) {
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TAILQ_REMOVE(&aiop->jobtorun, aiocbe, list);
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return aiocbe;
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}
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for (aiocbe = TAILQ_FIRST(&aio_jobs);
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aiocbe;
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aiocbe = TAILQ_NEXT(aiocbe, list)) {
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struct kaioinfo *ki;
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struct proc *userp;
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userp = aiocbe->userproc;
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ki = userp->p_aioinfo;
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if (ki->kaio_active_count < ki->kaio_maxactive_count) {
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TAILQ_REMOVE(&aio_jobs, aiocbe, list);
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return aiocbe;
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}
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}
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return NULL;
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}
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/*
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* The AIO activity proper.
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*/
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void
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aio_process(struct aiocblist *aiocbe) {
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struct filedesc *fdp;
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struct proc *userp;
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struct aiocb *cb;
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struct file *fp;
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struct uio auio;
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struct iovec aiov;
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unsigned int fd;
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int cnt;
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int error;
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off_t offset;
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userp = aiocbe->userproc;
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cb = &aiocbe->uaiocb;
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#if DEBUGAIO > 0
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if (debugaio > 1)
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printf("AIO %s, fd: %d, offset: 0x%x, address: 0x%x, size: %d\n",
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cb->aio_lio_opcode == LIO_READ?"Read":"Write",
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cb->aio_fildes, (int) cb->aio_offset,
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cb->aio_buf, cb->aio_nbytes);
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#endif
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#if SLOW
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tsleep(curproc, PVM, "aioprc", hz);
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#endif
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fdp = curproc->p_fd;
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/*
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* Range check file descriptor
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*/
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fd = cb->aio_fildes;
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fp = fdp->fd_ofiles[fd];
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aiov.iov_base = cb->aio_buf;
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aiov.iov_len = cb->aio_nbytes;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_offset = offset = cb->aio_offset;
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auio.uio_resid = cb->aio_nbytes;
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cnt = cb->aio_nbytes;
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auio.uio_segflg = UIO_USERSPACE;
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auio.uio_procp = curproc;
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if (cb->aio_lio_opcode == LIO_READ) {
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auio.uio_rw = UIO_READ;
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error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred);
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} else {
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auio.uio_rw = UIO_WRITE;
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error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred);
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}
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if (error) {
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if (auio.uio_resid != cnt) {
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if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
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error = 0;
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if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE))
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psignal(userp, SIGPIPE);
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}
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}
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#if DEBUGAIO > 0
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if (debugaio > 1)
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printf("%s complete: error: %d, status: %d, nio: %d, resid: %d, offset: %d\n",
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cb->aio_lio_opcode == LIO_READ?"Read":"Write",
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error, cnt, cnt - auio.uio_resid, auio.uio_resid, (int) offset & 0xffffffff);
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#endif
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cnt -= auio.uio_resid;
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cb->_aiocb_private.error = error;
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cb->_aiocb_private.status = cnt;
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return;
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}
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|
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/*
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* The AIO daemon.
|
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*/
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static void
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aio_startproc(void *uproc)
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{
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struct aioproclist *aiop;
|
|
|
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/*
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* Allocate and ready the aio control info
|
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*/
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aiop = malloc(sizeof *aiop, M_AIO, M_WAITOK);
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aiop->aioproc = curproc;
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aiop->aioprocflags |= AIOP_FREE;
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TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
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TAILQ_INIT(&aiop->jobtorun);
|
|
|
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/*
|
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* Get rid of current address space
|
|
*/
|
|
if (curproc->p_vmspace->vm_refcnt == 1) {
|
|
if (curproc->p_vmspace->vm_shm)
|
|
shmexit(curproc);
|
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pmap_remove_pages(&curproc->p_vmspace->vm_pmap, 0, USRSTACK);
|
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vm_map_remove(&curproc->p_vmspace->vm_map, 0, USRSTACK);
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} else {
|
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vmspace_exec(curproc);
|
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}
|
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|
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/*
|
|
* Make up a name for the daemon
|
|
*/
|
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strcpy(curproc->p_comm, "aiodaemon");
|
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|
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/*
|
|
* Get rid of our current filedescriptors
|
|
*/
|
|
fdfree(curproc);
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curproc->p_fd = NULL;
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curproc->p_ucred = crcopy(curproc->p_ucred);
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curproc->p_ucred->cr_uid = 0;
|
|
curproc->p_ucred->cr_groups[0] = 1;
|
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curproc->p_flag |= P_SYSTEM;
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|
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#if DEBUGAIO > 0
|
|
if (debugaio > 2)
|
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printf("Started new process: %d\n", curproc->p_pid);
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#endif
|
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wakeup(&aio_freeproc);
|
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|
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while(1) {
|
|
struct vmspace *myvm, *tmpvm;
|
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struct proc *cp = curproc;
|
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struct aiocblist *aiocbe;
|
|
|
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if ((aiop->aioprocflags & AIOP_FREE) == 0) {
|
|
TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
|
|
aiop->aioprocflags |= AIOP_FREE;
|
|
}
|
|
if (tsleep(cp, PRIBIO, "aiordy", hz*30)) {
|
|
if ((num_aio_procs > target_aio_procs) &&
|
|
(TAILQ_FIRST(&aiop->jobtorun) == NULL))
|
|
exit1(curproc, 0);
|
|
}
|
|
|
|
if (aiop->aioprocflags & AIOP_FREE) {
|
|
TAILQ_REMOVE(&aio_freeproc, aiop, list);
|
|
TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
|
|
aiop->aioprocflags &= ~AIOP_FREE;
|
|
}
|
|
|
|
myvm = curproc->p_vmspace;
|
|
|
|
while ( aiocbe = aio_selectjob(aiop)) {
|
|
struct aiocb *cb;
|
|
struct kaioinfo *ki;
|
|
struct proc *userp;
|
|
|
|
cb = &aiocbe->uaiocb;
|
|
userp = aiocbe->userproc;
|
|
ki = userp->p_aioinfo;
|
|
|
|
aiocbe->jobstate = JOBST_JOBRUNNING;
|
|
if (userp != cp) {
|
|
tmpvm = curproc->p_vmspace;
|
|
curproc->p_vmspace = userp->p_vmspace;
|
|
++curproc->p_vmspace->vm_refcnt;
|
|
pmap_activate(curproc);
|
|
if (tmpvm != myvm) {
|
|
vmspace_free(tmpvm);
|
|
}
|
|
if (curproc->p_fd)
|
|
fdfree(curproc);
|
|
curproc->p_fd = fdshare(userp);
|
|
cp = userp;
|
|
}
|
|
|
|
ki->kaio_active_count++;
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("process: pid: %d(%d), active: %d, queue: %d\n",
|
|
cb->_aiocb_private.kernelinfo,
|
|
userp->p_pid, ki->kaio_active_count, ki->kaio_queue_count);
|
|
#endif
|
|
aiocbe->jobaioproc = aiop;
|
|
aio_process(aiocbe);
|
|
--ki->kaio_active_count;
|
|
if (ki->kaio_active_count == 0)
|
|
wakeup(ki);
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("DONE process: pid: %d(%d), active: %d, queue: %d\n",
|
|
cb->_aiocb_private.kernelinfo,
|
|
userp->p_pid, ki->kaio_active_count, ki->kaio_queue_count);
|
|
#endif
|
|
|
|
aiocbe->jobstate = JOBST_JOBFINISHED;
|
|
|
|
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 (aiocbe->jobflags & AIOCBLIST_SUSPEND) {
|
|
wakeup(userp);
|
|
aiocbe->jobflags &= ~AIOCBLIST_SUSPEND;
|
|
}
|
|
|
|
if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
|
|
psignal(userp, cb->aio_sigevent.sigev_signo);
|
|
}
|
|
}
|
|
|
|
if (cp != curproc) {
|
|
tmpvm = curproc->p_vmspace;
|
|
curproc->p_vmspace = myvm;
|
|
pmap_activate(curproc);
|
|
vmspace_free(tmpvm);
|
|
if (curproc->p_fd)
|
|
fdfree(curproc);
|
|
curproc->p_fd = NULL;
|
|
cp = curproc;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create a new AIO daemon.
|
|
*/
|
|
static int
|
|
aio_newproc() {
|
|
int error;
|
|
struct rfork_args rfa;
|
|
struct proc *p;
|
|
|
|
rfa.flags = RFMEM | RFPROC | RFCFDG;
|
|
|
|
p = curproc;
|
|
if (error = rfork(p, &rfa))
|
|
return error;
|
|
cpu_set_fork_handler(p = pfind(p->p_retval[0]), aio_startproc, curproc);
|
|
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 2)
|
|
printf("Waiting for new process: %d, count: %d\n",
|
|
curproc->p_pid, num_aio_procs);
|
|
#endif
|
|
|
|
error = tsleep(&aio_freeproc, PZERO, "aiosta", 5*hz);
|
|
++num_aio_procs;
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
/*
|
|
* Queue a new AIO request.
|
|
*/
|
|
static int
|
|
_aio_aqueue(struct proc *p, struct aiocb *job, 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)) {
|
|
TAILQ_REMOVE(&aio_freejobs, aiocbe, list);
|
|
} else {
|
|
aiocbe = malloc (sizeof *aiocbe, M_AIO, M_WAITOK);
|
|
}
|
|
|
|
error = copyin((caddr_t)job,
|
|
(caddr_t) &aiocbe->uaiocb, sizeof aiocbe->uaiocb);
|
|
if (error) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("aio_aqueue: Copyin error: %d\n", error);
|
|
#endif
|
|
TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("aio_aqueue: Null type\n");
|
|
#endif
|
|
suword(&job->_aiocb_private.status, -1);
|
|
suword(&job->_aiocb_private.error, EBADF);
|
|
}
|
|
return EBADF;
|
|
}
|
|
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 3)
|
|
printf("aio_aqueue: fd: %d, cmd: %d, buf: %d, cnt: %d, fileoffset: %d\n",
|
|
aiocbe->uaiocb.aio_fildes,
|
|
aiocbe->uaiocb.aio_lio_opcode,
|
|
(int) aiocbe->uaiocb.aio_buf & 0xffffffff,
|
|
aiocbe->uaiocb.aio_nbytes,
|
|
(int) aiocbe->uaiocb.aio_offset & 0xffffffff);
|
|
#endif
|
|
|
|
|
|
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.status, -1);
|
|
suword(&job->_aiocb_private.error, EBADF);
|
|
}
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("aio_aqueue: Bad file descriptor\n");
|
|
#endif
|
|
return EBADF;
|
|
}
|
|
|
|
if (aiocbe->uaiocb.aio_offset == -1LL) {
|
|
TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
|
|
if (type == 0) {
|
|
suword(&job->_aiocb_private.status, -1);
|
|
suword(&job->_aiocb_private.error, EINVAL);
|
|
}
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("aio_aqueue: bad offset\n");
|
|
#endif
|
|
return EINVAL;
|
|
}
|
|
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 2)
|
|
printf("job addr: 0x%x, 0x%x, %d\n", job, &job->_aiocb_private.kernelinfo, jobrefid);
|
|
#endif
|
|
|
|
error = suword(&job->_aiocb_private.kernelinfo, jobrefid);
|
|
if (error) {
|
|
TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
|
|
if (type == 0) {
|
|
suword(&job->_aiocb_private.status, -1);
|
|
suword(&job->_aiocb_private.error, EINVAL);
|
|
}
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("aio_aqueue: fetch of kernelinfo from user space\n");
|
|
#endif
|
|
return error;
|
|
}
|
|
|
|
aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)jobrefid;
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 2)
|
|
printf("aio_aqueue: New job: %d... ", jobrefid);
|
|
#endif
|
|
++jobrefid;
|
|
|
|
if (opcode == LIO_NOP) {
|
|
TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
|
|
if (type == 0) {
|
|
suword(&job->_aiocb_private.status, -1);
|
|
suword(&job->_aiocb_private.error, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if ((opcode != LIO_NOP) &&
|
|
(opcode != LIO_READ) && (opcode != LIO_WRITE)) {
|
|
TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
|
|
if (type == 0) {
|
|
suword(&job->_aiocb_private.status, -1);
|
|
suword(&job->_aiocb_private.error, EINVAL);
|
|
}
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("aio_aqueue: invalid LIO op: %d\n", opcode);
|
|
#endif
|
|
return EINVAL;
|
|
}
|
|
|
|
suword(&job->_aiocb_private.error, 0);
|
|
suword(&job->_aiocb_private.status, 0);
|
|
aiocbe->userproc = p;
|
|
aiocbe->jobflags = 0;
|
|
ki = p->p_aioinfo;
|
|
++num_queue_count;
|
|
++ki->kaio_queue_count;
|
|
|
|
retryproc:
|
|
if (aiop = TAILQ_FIRST(&aio_freeproc)) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("found a free AIO process\n");
|
|
#endif
|
|
TAILQ_REMOVE(&aio_freeproc, aiop, list);
|
|
TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
|
|
aiop->aioprocflags &= ~AIOP_FREE;
|
|
TAILQ_INSERT_TAIL(&aiop->jobtorun, aiocbe, list);
|
|
TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
|
|
aiocbe->jobstate = JOBST_JOBQPROC;
|
|
|
|
aiocbe->jobaioproc = aiop;
|
|
wakeup(aiop->aioproc);
|
|
} else if ((num_aio_procs < max_aio_procs) &&
|
|
(ki->kaio_active_count < ki->kaio_maxactive_count)) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 1) {
|
|
printf("aio_aqueue: starting new proc: num_aio_procs(%d), max_aio_procs(%d)\n", num_aio_procs, max_aio_procs);
|
|
printf(" ki->kaio_active_count(%d), ki->kaio_maxactive_count(%d)\n", ki->kaio_active_count, ki->kaio_maxactive_count);
|
|
}
|
|
#endif
|
|
if (error = aio_newproc()) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("aio_aqueue: problem sleeping for starting proc: %d\n",
|
|
error);
|
|
#endif
|
|
}
|
|
goto retryproc;
|
|
} else {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("queuing to global queue\n");
|
|
#endif
|
|
TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
|
|
TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
|
|
aiocbe->jobstate = JOBST_JOBQGLOBAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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, type);
|
|
}
|
|
|
|
/*
|
|
* Support the aio_return system call
|
|
*/
|
|
int
|
|
aio_return(struct proc *p, struct aio_return_args *uap) {
|
|
int jobref, status;
|
|
struct aiocblist *cb;
|
|
struct kaioinfo *ki;
|
|
|
|
ki = p->p_aioinfo;
|
|
if (ki == NULL) {
|
|
return EINVAL;
|
|
}
|
|
|
|
jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo);
|
|
if (jobref == -1)
|
|
return EINVAL;
|
|
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("aio_return: jobref: %d\n", jobref);
|
|
#endif
|
|
|
|
|
|
for (cb = TAILQ_FIRST(&ki->kaio_jobdone);
|
|
cb;
|
|
cb = TAILQ_NEXT(cb, plist)) {
|
|
if (((int) cb->uaiocb._aiocb_private.kernelinfo) == jobref) {
|
|
p->p_retval[0] = cb->uaiocb._aiocb_private.status;
|
|
aio_free_entry(cb);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
status = fuword(&uap->aiocbp->_aiocb_private.status);
|
|
if (status == -1)
|
|
return 0;
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Rundown the jobs for a given process.
|
|
*/
|
|
void
|
|
aio_marksuspend(struct proc *p, int njobs, int *joblist, int set) {
|
|
struct aiocblist *aiocbe;
|
|
struct kaioinfo *ki;
|
|
|
|
ki = p->p_aioinfo;
|
|
if (ki == NULL)
|
|
return;
|
|
|
|
for (aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue);
|
|
aiocbe;
|
|
aiocbe = TAILQ_NEXT(aiocbe, plist)) {
|
|
|
|
if (njobs) {
|
|
|
|
int i;
|
|
|
|
for(i = 0; i < njobs; i++) {
|
|
if (((int) aiocbe->uaiocb._aiocb_private.kernelinfo) == joblist[i])
|
|
break;
|
|
}
|
|
|
|
if (i == njobs)
|
|
continue;
|
|
}
|
|
|
|
if (set)
|
|
aiocbe->jobflags |= AIOCBLIST_SUSPEND;
|
|
else
|
|
aiocbe->jobflags &= ~AIOCBLIST_SUSPEND;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 error, s, timo;
|
|
int *joblist;
|
|
|
|
|
|
timo = 0;
|
|
if (uap->timeout) {
|
|
/*
|
|
* Get timespec struct
|
|
*/
|
|
if (error = copyin((caddr_t) uap->timeout, (caddr_t) &ts, sizeof ts)) {
|
|
return error;
|
|
}
|
|
|
|
if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
|
|
return (EINVAL);
|
|
|
|
TIMESPEC_TO_TIMEVAL(&atv, &ts)
|
|
if (itimerfix(&atv))
|
|
return (EINVAL);
|
|
/*
|
|
* XXX this is not as careful as settimeofday() about minimising
|
|
* interrupt latency. The hzto() interface is inconvenient as usual.
|
|
*/
|
|
s = splclock();
|
|
timevaladd(&atv, &time);
|
|
timo = hzto(&atv);
|
|
splx(s);
|
|
if (timo == 0)
|
|
timo = 1;
|
|
}
|
|
|
|
ki = p->p_aioinfo;
|
|
if (ki == NULL)
|
|
return EAGAIN;
|
|
|
|
joblist = malloc(uap->nent * sizeof(int), M_TEMP, M_WAITOK);
|
|
cbptr = uap->aiocbp;
|
|
|
|
for(i=0;i<uap->nent;i++) {
|
|
cbp = (struct aiocb *) fuword((caddr_t) &cbptr[i]);
|
|
#if DEBUGAIO > 1
|
|
if (debugaio > 2)
|
|
printf("cbp: %x\n", cbp);
|
|
#endif
|
|
joblist[i] = fuword(&cbp->_aiocb_private.kernelinfo);
|
|
cbptr++;
|
|
}
|
|
|
|
|
|
while (1) {
|
|
for (cb = TAILQ_FIRST(&ki->kaio_jobdone);
|
|
cb;
|
|
cb = TAILQ_NEXT(cb, plist)) {
|
|
for(i=0;i<uap->nent;i++) {
|
|
if (((int) cb->uaiocb._aiocb_private.kernelinfo) == joblist[i]) {
|
|
free(joblist, M_TEMP);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0) {
|
|
printf("Suspend, timeout: %d clocks, jobs:", timo);
|
|
for(i=0;i<uap->nent;i++)
|
|
printf(" %d", joblist[i]);
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
|
|
aio_marksuspend(p, uap->nent, joblist, 1);
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 2) {
|
|
printf("Suspending -- waiting for all I/O's to complete: ");
|
|
for(i=0;i<uap->nent;i++)
|
|
printf(" %d", joblist[i]);
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
error = tsleep(p, PRIBIO|PCATCH, "aiospn", timo);
|
|
aio_marksuspend(p, uap->nent, joblist, 0);
|
|
|
|
if (error == EINTR) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 2)
|
|
printf(" signal\n");
|
|
#endif
|
|
free(joblist, M_TEMP);
|
|
return EINTR;
|
|
} else if (error == EWOULDBLOCK) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 2)
|
|
printf(" timeout\n");
|
|
#endif
|
|
free(joblist, M_TEMP);
|
|
return EAGAIN;
|
|
}
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 2)
|
|
printf("\n");
|
|
#endif
|
|
}
|
|
|
|
/* 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 AIO_NOTCANCELLED;
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
struct aiocblist *cb;
|
|
struct kaioinfo *ki;
|
|
int jobref;
|
|
int status;
|
|
|
|
ki = p->p_aioinfo;
|
|
if (ki == NULL)
|
|
return EINVAL;
|
|
|
|
jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo);
|
|
if (jobref == -1)
|
|
return EFAULT;
|
|
|
|
for (cb = TAILQ_FIRST(&ki->kaio_jobdone);
|
|
cb;
|
|
cb = TAILQ_NEXT(cb, plist)) {
|
|
|
|
if (((int) 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 (((int) cb->uaiocb._aiocb_private.kernelinfo) == jobref) {
|
|
p->p_retval[0] = EINPROGRESS;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
#if DEBUGAIO > 1
|
|
if (debugaio > 2)
|
|
printf("queueing aio_read\n");
|
|
#endif
|
|
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))
|
|
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 = 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);
|
|
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) {
|
|
#if DEBUGAIO > 1
|
|
if (debugaio > 2)
|
|
printf("queing aio_write\n");
|
|
#endif
|
|
return aio_aqueue(p, (struct aiocb *) uap->aiocbp, LIO_WRITE);
|
|
}
|
|
|
|
if (error = copyin((caddr_t) uap->aiocbp, (caddr_t) &iocb, sizeof iocb))
|
|
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 = 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);
|
|
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;
|
|
int error, runningcode;
|
|
int i;
|
|
|
|
if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("lio_listio: bad mode: %d\n", uap->mode);
|
|
#endif
|
|
return EINVAL;
|
|
}
|
|
|
|
nent = uap->nent;
|
|
if (nent > AIO_LISTIO_MAX) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("lio_listio: nent > AIO_LISTIO_MAX: %d > %d\n", nent, AIO_LISTIO_MAX);
|
|
#endif
|
|
return EINVAL;
|
|
}
|
|
|
|
if (p->p_aioinfo == NULL) {
|
|
aio_init_aioinfo(p);
|
|
}
|
|
|
|
if ((nent + num_queue_count) > max_queue_count) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("lio_listio: (nent(%d) + num_queue_count(%d)) > max_queue_count(%d)\n", nent, num_queue_count, max_queue_count);
|
|
#endif
|
|
return EAGAIN;
|
|
}
|
|
|
|
ki = p->p_aioinfo;
|
|
if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("lio_listio: (nent(%d) + ki->kaio_queue_count(%d)) > ki->kaio_qallowed_count(%d)\n", nent, ki->kaio_queue_count, ki->kaio_qallowed_count);
|
|
#endif
|
|
return EAGAIN;
|
|
}
|
|
|
|
/*
|
|
num_queue_count += nent;
|
|
ki->kaio_queue_count += nent;
|
|
*/
|
|
nentqueued = 0;
|
|
|
|
/*
|
|
* get pointers to the list of I/O requests
|
|
iocbvec = malloc(uap->nent * sizeof(struct aiocb *), M_TEMP, M_WAITOK);
|
|
*/
|
|
|
|
cbptr = uap->acb_list;
|
|
for(i = 0; i < uap->nent; i++) {
|
|
iocb = (struct aiocb *) fuword((caddr_t) &cbptr[i]);
|
|
error = _aio_aqueue(p, iocb, 0);
|
|
if (error == 0)
|
|
nentqueued++;
|
|
}
|
|
|
|
/*
|
|
* If we haven't queued any, then just return error
|
|
*/
|
|
if (nentqueued == 0) {
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("lio_listio: none queued\n");
|
|
#endif
|
|
return EIO;
|
|
}
|
|
|
|
#if DEBUGAIO > 0
|
|
if (debugaio > 0)
|
|
printf("lio_listio: %d queued\n", nentqueued);
|
|
#endif
|
|
|
|
/*
|
|
* Calculate the appropriate error return
|
|
*/
|
|
runningcode = 0;
|
|
if (nentqueued != nent)
|
|
runningcode = EIO;
|
|
|
|
if (uap->mode == LIO_WAIT) {
|
|
while (1) {
|
|
for(i = 0; i < uap->nent; i++) {
|
|
int found;
|
|
int jobref, command, status;
|
|
|
|
/*
|
|
* Fetch address of the control buf pointer in user space
|
|
*/
|
|
iocb = (struct aiocb *) fuword((caddr_t) &cbptr[i]);
|
|
|
|
/*
|
|
* Fetch the associated command from user space
|
|
*/
|
|
command = fuword(&iocb->aio_lio_opcode);
|
|
if (command == LIO_NOP)
|
|
continue;
|
|
|
|
/*
|
|
* If the status shows error or complete, then skip this entry.
|
|
*/
|
|
status = fuword(&iocb->_aiocb_private.status);
|
|
if (status != 0)
|
|
continue;
|
|
|
|
jobref = fuword(&iocb->_aiocb_private.kernelinfo);
|
|
|
|
found = 0;
|
|
for (cb = TAILQ_FIRST(&ki->kaio_jobdone);
|
|
cb;
|
|
cb = TAILQ_NEXT(cb, plist)) {
|
|
if (((int) cb->uaiocb._aiocb_private.kernelinfo) == jobref) {
|
|
found++;
|
|
break;
|
|
}
|
|
}
|
|
if (found == 0)
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If all I/Os have been disposed of, then we can return
|
|
*/
|
|
if (i == uap->nent) {
|
|
return runningcode;
|
|
}
|
|
|
|
aio_marksuspend(p, 0, 0, 1);
|
|
error = tsleep(p, PRIBIO|PCATCH, "aiospn", 0);
|
|
aio_marksuspend(p, 0, 0, 0);
|
|
|
|
if (error == EINTR) {
|
|
return EINTR;
|
|
} else if (error == EWOULDBLOCK) {
|
|
return EAGAIN;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
return runningcode;
|
|
}
|